valueflow.cpp

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2025 Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @brief This is the ValueFlow component in Cppcheck.
 *
 * Each @sa Token in the token list has a list of values. These are
 * the "possible" values for the Token at runtime.
 *
 * In the --debug and --debug-normal output you can see the ValueFlow data. For example:
 *
 *     int f()
 *     {
 *         int x = 10;
 *         return 4 * x + 2;
 *     }
 *
 * The --debug-normal output says:
 *
 *     ##Value flow
 *     Line 3
 *       10 always 10
 *     Line 4
 *       4 always 4
 *       * always 40
 *       x always 10
 *       + always 42
 *       2 always 2
 *
 * All value flow analysis is executed in the ValueFlow::setValues() function. The ValueFlow analysis is executed after
 * the tokenizer/ast/symboldatabase/etc.. The ValueFlow analysis is done in a series of valueFlow* function calls, where
 * each such function call can only use results from previous function calls. The function calls should be arranged so
 * that valueFlow* that do not require previous ValueFlow information should be first.
 *
 * Type of analysis
 * ================
 *
 * This is "flow sensitive" value flow analysis. We _usually_ track the value for 1 variable at a time.
 *
 * How are calculations handled
 * ============================
 *
 * Here is an example code:
 *
 *   x = 3 + 4;
 *
 * The valueFlowNumber set the values for the "3" and "4" tokens by calling setTokenValue().
 * The setTokenValue() handle the calculations automatically. When both "3" and "4" have values, the "+" can be
 * calculated. setTokenValue() recursively calls itself when parents in calculations can be calculated.
 *
 * Forward / Reverse flow analysis
 * ===============================
 *
 * In forward value flow analysis we know a value and see what happens when we are stepping the program forward. Like
 * normal execution. The valueFlowForward is used in this analysis.
 *
 * In reverse value flow analysis we know the value of a variable at line X. And try to "execute backwards" to determine
 * possible values before line X. The valueFlowReverse is used in this analysis.
 *
 *
 */

#include "valueflow.h"

#include "analyzer.h"
#include "astutils.h"
#include "calculate.h"
#include "checkuninitvar.h"
#include "config.h"
#include "errorlogger.h"
#include "errortypes.h"
#include "findtoken.h"
#include "forwardanalyzer.h"
#include "infer.h"
#include "library.h"
#include "mathlib.h"
#include "path.h"
#include "platform.h"
#include "programmemory.h"
#include "reverseanalyzer.h"
#include "settings.h"
#include "smallvector.h"
#include "sourcelocation.h"
#include "standards.h"
#include "symboldatabase.h"
#include "timer.h"
#include "token.h"
#include "tokenlist.h"
#include "utils.h"
#include "valueptr.h"
#include "vfvalue.h"

#include "vf_analyzers.h"
#include "vf_common.h"
#include "vf_settokenvalue.h"

#include <algorithm>
#include <array>
#include <cassert>
#include <chrono>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <initializer_list>
#include <iterator>
#include <limits>
#include <map>
#include <memory>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

static void bailoutInternal(const std::string& type,
                            const TokenList& tokenlist,
                            ErrorLogger& errorLogger,
                            const Token* tok,
                            const std::string& what,
                            const std::string& file,
                            int line,
                            std::string function)
{
    if (function.find("operator") != std::string::npos)
        function = "(valueFlow)";
    ErrorMessage::FileLocation loc(tok, &tokenlist);
    const std::string location = Path::stripDirectoryPart(file) + ":" + std::to_string(line) + ":";
    ErrorMessage errmsg({std::move(loc)},
                        tokenlist.getSourceFilePath(),
                        Severity::debug,
                        (file.empty() ? "" : location) + function + " bailout: " + what,
                        type,
                        Certainty::normal);
    errorLogger.reportErr(errmsg);
}

#define bailout2(type, tokenlist, errorLogger, tok, what)                                                              \
    bailoutInternal((type), (tokenlist), (errorLogger), (tok), (what), __FILE__, __LINE__, __func__)

#define bailout(tokenlist, errorLogger, tok, what)                                                                     \
    bailout2("valueFlowBailout", (tokenlist), (errorLogger), (tok), (what))

#define bailoutIncompleteVar(tokenlist, errorLogger, tok, what)                                                        \
    bailoutInternal("valueFlowBailoutIncompleteVar", (tokenlist), (errorLogger), (tok), (what), "", 0, __func__)

static void changeKnownToPossible(std::list<ValueFlow::Value>& values, int indirect = -1)
{
    for (ValueFlow::Value& v : values) {
        if (indirect >= 0 && v.indirect != indirect)
            continue;
        v.changeKnownToPossible();
    }
}

static void removeImpossible(std::list<ValueFlow::Value>& values, int indirect = -1)
{
    values.remove_if([&](const ValueFlow::Value& v) {
        if (indirect >= 0 && v.indirect != indirect)
            return false;
        return v.isImpossible();
    });
}

static void lowerToPossible(std::list<ValueFlow::Value>& values, int indirect = -1)
{
    changeKnownToPossible(values, indirect);
    removeImpossible(values, indirect);
}

static void changePossibleToKnown(std::list<ValueFlow::Value>& values, int indirect = -1)
{
    for (ValueFlow::Value& v : values) {
        if (indirect >= 0 && v.indirect != indirect)
            continue;
        if (!v.isPossible())
            continue;
        if (v.bound != ValueFlow::Value::Bound::Point)
            continue;
        v.setKnown();
    }
}

static bool isNonConditionalPossibleIntValue(const ValueFlow::Value& v)
{
    if (v.conditional)
        return false;
    if (v.condition)
        return false;
    if (!v.isPossible())
        return false;
    if (!v.isIntValue())
        return false;
    return true;
}

static void setValueUpperBound(ValueFlow::Value& value, bool upper)
{
    if (upper)
        value.bound = ValueFlow::Value::Bound::Upper;
    else
        value.bound = ValueFlow::Value::Bound::Lower;
}

static void setValueBound(ValueFlow::Value& value, const Token* tok, bool invert)
{
    if (Token::Match(tok, "<|<=")) {
        setValueUpperBound(value, !invert);
    } else if (Token::Match(tok, ">|>=")) {
        setValueUpperBound(value, invert);
    }
}

static void setConditionalValue(ValueFlow::Value& value, const Token* tok, MathLib::bigint i)
{
    assert(value.isIntValue());
    value.intvalue = i;
    value.assumeCondition(tok);
    value.setPossible();
}

static void setConditionalValues(const Token* tok,
                                 bool lhs,
                                 MathLib::bigint value,
                                 ValueFlow::Value& true_value,
                                 ValueFlow::Value& false_value)
{
    if (Token::Match(tok, "==|!=|>=|<=")) {
        setConditionalValue(true_value, tok, value);
        const char* greaterThan = ">=";
        const char* lessThan = "<=";
        if (lhs)
            std::swap(greaterThan, lessThan);
        if (Token::simpleMatch(tok, greaterThan, strlen(greaterThan))) {
            setConditionalValue(false_value, tok, value - 1);
        } else if (Token::simpleMatch(tok, lessThan, strlen(lessThan))) {
            setConditionalValue(false_value, tok, value + 1);
        } else {
            setConditionalValue(false_value, tok, value);
        }
    } else {
        const char* greaterThan = ">";
        const char* lessThan = "<";
        if (lhs)
            std::swap(greaterThan, lessThan);
        if (Token::simpleMatch(tok, greaterThan, strlen(greaterThan))) {
            setConditionalValue(true_value, tok, value + 1);
            setConditionalValue(false_value, tok, value);
        } else if (Token::simpleMatch(tok, lessThan, strlen(lessThan))) {
            setConditionalValue(true_value, tok, value - 1);
            setConditionalValue(false_value, tok, value);
        }
    }
    setValueBound(true_value, tok, lhs);
    setValueBound(false_value, tok, !lhs);
}

static bool isSaturated(MathLib::bigint value)
{
    return value == std::numeric_limits<MathLib::bigint>::max() || value == std::numeric_limits<MathLib::bigint>::min();
}

static void parseCompareEachInt(
    const Token* tok,
    const std::function<void(const Token* varTok, ValueFlow::Value true_value, ValueFlow::Value false_value)>& each,
    const std::function<std::vector<ValueFlow::Value>(const Token*)>& evaluate)
{
    if (!tok->astOperand1() || !tok->astOperand2())
        return;
    if (tok->isComparisonOp()) {
        std::vector<ValueFlow::Value> value1 = evaluate(tok->astOperand1());
        std::vector<ValueFlow::Value> value2 = evaluate(tok->astOperand2());
        if (!value1.empty() && !value2.empty()) {
            if (tok->astOperand1()->hasKnownIntValue())
                value2.clear();
            if (tok->astOperand2()->hasKnownIntValue())
                value1.clear();
        }
        for (const ValueFlow::Value& v1 : value1) {
            if (isSaturated(v1.intvalue) || astIsFloat(tok->astOperand2(), /*unknown*/ false))
                continue;
            ValueFlow::Value true_value = v1;
            ValueFlow::Value false_value = v1;
            setConditionalValues(tok, true, v1.intvalue, true_value, false_value);
            each(tok->astOperand2(), std::move(true_value), std::move(false_value));
        }
        for (const ValueFlow::Value& v2 : value2) {
            if (isSaturated(v2.intvalue) || astIsFloat(tok->astOperand1(), /*unknown*/ false))
                continue;
            ValueFlow::Value true_value = v2;
            ValueFlow::Value false_value = v2;
            setConditionalValues(tok, false, v2.intvalue, true_value, false_value);
            each(tok->astOperand1(), std::move(true_value), std::move(false_value));
        }
    }
}

static void parseCompareEachInt(
    const Token* tok,
    const std::function<void(const Token* varTok, ValueFlow::Value true_value, ValueFlow::Value false_value)>& each)
{
    parseCompareEachInt(tok, each, [](const Token* t) -> std::vector<ValueFlow::Value> {
        if (const ValueFlow::Value* v = t->getKnownValue(ValueFlow::Value::ValueType::INT))
            return {*v};
        std::vector<ValueFlow::Value> result;
        std::copy_if(t->values().cbegin(), t->values().cend(), std::back_inserter(result), [&](const ValueFlow::Value& v) {
            if (v.path < 1)
                return false;
            if (!isNonConditionalPossibleIntValue(v))
                return false;
            return true;
        });
        return result;
    });
}

const Token* ValueFlow::parseCompareInt(const Token* tok,
                                        ValueFlow::Value& true_value,
                                        ValueFlow::Value& false_value,
                                        const std::function<std::vector<MathLib::bigint>(const Token*)>& evaluate)
{
    const Token* result = nullptr;
    parseCompareEachInt(
        tok,
        [&](const Token* vartok, ValueFlow::Value true_value2, ValueFlow::Value false_value2) {
        if (result)
            return;
        result = vartok;
        true_value = std::move(true_value2);
        false_value = std::move(false_value2);
    },
        [&](const Token* t) -> std::vector<ValueFlow::Value> {
        std::vector<ValueFlow::Value> r;
        std::vector<MathLib::bigint> v = evaluate(t);

        std::transform(v.cbegin(), v.cend(), std::back_inserter(r), [&](MathLib::bigint i) {
            return ValueFlow::Value{i};
        });
        return r;
    });
    return result;
}

const Token *ValueFlow::parseCompareInt(const Token *tok, ValueFlow::Value &true_value, ValueFlow::Value &false_value)
{
    return parseCompareInt(tok, true_value, false_value, [](const Token* t) -> std::vector<MathLib::bigint> {
        if (const ValueFlow::Value* v = t->getKnownValue(Value::ValueType::INT))
            return {v->intvalue};
        return std::vector<MathLib::bigint>{};
    });
}

static bool isEscapeScope(const Token* tok, const Settings& settings, bool unknown = false)
{
    if (!Token::simpleMatch(tok, "{"))
        return false;
    // TODO this search for termTok in all subscopes. It should check the end of the scope.
    const Token* termTok = Token::findmatch(tok, "return|continue|break|throw|goto", tok->link());
    if (termTok && termTok->scope() == tok->scope())
        return true;
    std::string unknownFunction;
    if (settings.library.isScopeNoReturn(tok->link(), &unknownFunction))
        return unknownFunction.empty() || unknown;
    return false;
}

void ValueFlow::combineValueProperties(const ValueFlow::Value &value1, const ValueFlow::Value &value2, ValueFlow::Value &result)
{
    if (value1.isKnown() && value2.isKnown())
        result.setKnown();
    else if (value1.isImpossible() || value2.isImpossible())
        result.setImpossible();
    else if (value1.isInconclusive() || value2.isInconclusive())
        result.setInconclusive();
    else
        result.setPossible();
    if (value1.tokvalue)
        result.tokvalue = value1.tokvalue;
    else if (value2.tokvalue)
        result.tokvalue = value2.tokvalue;
    if (value1.isSymbolicValue()) {
        result.valueType = value1.valueType;
        result.tokvalue = value1.tokvalue;
    }
    if (value2.isSymbolicValue()) {
        result.valueType = value2.valueType;
        result.tokvalue = value2.tokvalue;
    }
    if (value1.isIteratorValue())
        result.valueType = value1.valueType;
    if (value2.isIteratorValue())
        result.valueType = value2.valueType;
    result.condition = value1.condition ? value1.condition : value2.condition;
    result.varId = (value1.varId != 0) ? value1.varId : value2.varId;
    result.varvalue = (result.varId == value1.varId) ? value1.varvalue : value2.varvalue;
    result.errorPath = (value1.errorPath.empty() ? value2 : value1).errorPath;
    result.safe = value1.safe || value2.safe;
    if (value1.bound == ValueFlow::Value::Bound::Point || value2.bound == ValueFlow::Value::Bound::Point) {
        if (value1.bound == ValueFlow::Value::Bound::Upper || value2.bound == ValueFlow::Value::Bound::Upper)
            result.bound = ValueFlow::Value::Bound::Upper;
        if (value1.bound == ValueFlow::Value::Bound::Lower || value2.bound == ValueFlow::Value::Bound::Lower)
            result.bound = ValueFlow::Value::Bound::Lower;
    }
    if (value1.path != value2.path)
        result.path = -1;
    else
        result.path = value1.path;
}

namespace {
    struct Result
    {
        size_t total;
        bool success;
    };
}

template<class F>
static Result accumulateStructMembers(const Scope* scope, F f, ValueFlow::Accuracy accuracy)
{
    size_t total = 0;
    std::set<const Scope*> anonScopes;
    for (const Variable& var : scope->varlist) {
        if (var.isStatic())
            continue;
        const MathLib::bigint bits = var.nameToken() ? var.nameToken()->bits() : -1;
        if (const ValueType* vt = var.valueType()) {
            if (vt->type == ValueType::Type::RECORD && vt->typeScope == scope)
                return {0, false};
            const MathLib::bigint dim = std::accumulate(var.dimensions().cbegin(), var.dimensions().cend(), 1LL, [](MathLib::bigint i1, const Dimension& dim) {
                return i1 * dim.num;
            });
            if (var.nameToken()->scope() != scope && var.nameToken()->scope()->definedType) { // anonymous union
                const auto ret = anonScopes.insert(var.nameToken()->scope());
                if (ret.second)
                    total = f(total, *vt, dim, bits);
            }
            else
                total = f(total, *vt, dim, bits);
        }
        if (accuracy == ValueFlow::Accuracy::ExactOrZero && total == 0 && bits == -1)
            return {0, false};
    }
    return {total, true};
}

static size_t bitCeil(size_t x)
{
    if (x <= 1)
        return 1;
    --x;
    x |= x >> 1;
    x |= x >> 2;
    x |= x >> 4;
    x |= x >> 8;
    x |= x >> 16;
    x |= x >> 32;
    return x + 1;
}

static size_t getAlignOf(const ValueType& vt, const Settings& settings, ValueFlow::Accuracy accuracy, int maxRecursion = 0)
{
    if (maxRecursion == settings.vfOptions.maxAlignOfRecursion) {
        // TODO: add bailout message
        return 0;
    }
    if (vt.pointer || vt.reference != Reference::None || vt.isPrimitive()) {
        auto align = ValueFlow::getSizeOf(vt, settings, accuracy);
        return align == 0 ? 0 : bitCeil(align);
    }
    if (vt.type == ValueType::Type::RECORD && vt.typeScope) {
        auto accHelper = [&](size_t max, const ValueType& vt2, size_t /*dim*/, size_t /*bits*/) {
            size_t a = getAlignOf(vt2, settings, accuracy, ++maxRecursion);
            return std::max(max, a);
        };
        Result result = accumulateStructMembers(vt.typeScope, accHelper, accuracy);
        size_t total = result.total;
        if (const Type* dt = vt.typeScope->definedType) {
            total = std::accumulate(dt->derivedFrom.begin(), dt->derivedFrom.end(), total, [&](size_t v, const Type::BaseInfo& bi) {
                if (bi.type && bi.type->classScope)
                    v += accumulateStructMembers(bi.type->classScope, accHelper, accuracy).total;
                return v;
            });
        }
        return result.success ? std::max<size_t>(1, total) : total;
    }
    if (vt.type == ValueType::Type::CONTAINER)
        return settings.platform.sizeof_pointer; // Just guess
    return 0;
}

size_t ValueFlow::getSizeOf(const ValueType &vt, const Settings &settings, Accuracy accuracy, int maxRecursion)
{
    if (maxRecursion == settings.vfOptions.maxSizeOfRecursion) {
        // TODO: add bailout message
        return 0;
    }
    if (vt.pointer || vt.reference != Reference::None)
        return settings.platform.sizeof_pointer;
    if (vt.type == ValueType::Type::BOOL || vt.type == ValueType::Type::CHAR)
        return 1;
    if (vt.type == ValueType::Type::SHORT)
        return settings.platform.sizeof_short;
    if (vt.type == ValueType::Type::WCHAR_T)
        return settings.platform.sizeof_wchar_t;
    if (vt.type == ValueType::Type::INT)
        return settings.platform.sizeof_int;
    if (vt.type == ValueType::Type::LONG)
        return settings.platform.sizeof_long;
    if (vt.type == ValueType::Type::LONGLONG)
        return settings.platform.sizeof_long_long;
    if (vt.type == ValueType::Type::FLOAT)
        return settings.platform.sizeof_float;
    if (vt.type == ValueType::Type::DOUBLE)
        return settings.platform.sizeof_double;
    if (vt.type == ValueType::Type::LONGDOUBLE)
        return settings.platform.sizeof_long_double;
    if (vt.type == ValueType::Type::CONTAINER)
        return 3 * settings.platform.sizeof_pointer; // Just guess
    if (vt.type == ValueType::Type::RECORD && vt.typeScope) {
        size_t currentBitCount = 0;
        size_t currentBitfieldAlloc = 0;
        auto accHelper = [&](size_t total, const ValueType& vt2, size_t dim, MathLib::bigint bits) -> size_t {
            const size_t charBit = settings.platform.char_bit;
            size_t n = ValueFlow::getSizeOf(vt2, settings,accuracy, ++maxRecursion);
            size_t a = getAlignOf(vt2, settings, accuracy);
            if (bits == 0) {
                if (currentBitfieldAlloc == 0) {
                    bits = n * charBit;
                } else {
                    bits = currentBitfieldAlloc * charBit - currentBitCount;
                }
            }
            if (bits > 0) {
                size_t ret = total;
                if (currentBitfieldAlloc == 0) {
                    currentBitfieldAlloc = n;
                    currentBitCount = 0;
                } else if (currentBitCount + bits > charBit * currentBitfieldAlloc) {
                    ret += currentBitfieldAlloc;
                    currentBitfieldAlloc = n;
                    currentBitCount = 0;
                }
                while (bits > charBit * currentBitfieldAlloc) {
                    ret += currentBitfieldAlloc;
                    bits -= charBit * currentBitfieldAlloc;
                }
                currentBitCount += bits;
                return ret;
            }
            if (n == 0 || a == 0)
                return accuracy == Accuracy::ExactOrZero ? 0 : total;
            n *= dim;
            size_t padding = (a - (total % a)) % a;
            if (currentBitCount > 0) {
                bool fitsInBitfield = currentBitCount + n * charBit <= currentBitfieldAlloc * charBit;
                bool isAligned = currentBitCount % (charBit * a) == 0;
                if (vt2.isIntegral() && fitsInBitfield && isAligned) {
                    currentBitCount += charBit * n;
                    return total;
                }
                n += currentBitfieldAlloc;
                currentBitfieldAlloc = 0;
                currentBitCount = 0;
            }
            return vt.typeScope->type == ScopeType::eUnion ? std::max(total, n) : total + padding + n;
        };
        Result result = accumulateStructMembers(vt.typeScope, accHelper, accuracy);
        size_t total = result.total;
        if (currentBitCount > 0)
            total += currentBitfieldAlloc;
        if (const Type* dt = vt.typeScope->definedType) {
            total = std::accumulate(dt->derivedFrom.begin(), dt->derivedFrom.end(), total, [&](size_t v, const Type::BaseInfo& bi) {
                if (bi.type && bi.type->classScope)
                    v += accumulateStructMembers(bi.type->classScope, accHelper, accuracy).total;
                return v;
            });
        }
        if (accuracy == Accuracy::ExactOrZero && total == 0 && !result.success)
            return 0;
        total = std::max(size_t{1}, total);
        size_t align = getAlignOf(vt, settings, accuracy);
        if (align == 0)
            return accuracy == Accuracy::ExactOrZero ? 0 : total;
        total += (align - (total % align)) % align;
        return total;
    }
    return 0;
}

static void valueFlowNumber(TokenList &tokenlist, const Settings& settings)
{
    for (Token *tok = tokenlist.front(); tok;) {
        tok = ValueFlow::valueFlowSetConstantValue(tok, settings);
    }

    if (tokenlist.isCPP() || settings.standards.c >= Standards::C23) {
        for (Token *tok = tokenlist.front(); tok; tok = tok->next()) {
            if (tok->isName() && !tok->varId() && Token::Match(tok, "%bool%")) {
                ValueFlow::Value value(tok->str() == "true");
                if (!tok->isTemplateArg())
                    value.setKnown();
                setTokenValue(tok, std::move(value), settings);
            } else if (Token::Match(tok, "[(,] NULL [,)]")) {
                // NULL function parameters are not simplified in the
                // normal tokenlist
                ValueFlow::Value value(0);
                if (!tok->isTemplateArg())
                    value.setKnown();
                setTokenValue(tok->next(), std::move(value), settings);
            }
        }
    }
}

static void valueFlowString(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->tokType() == Token::eString) {
            ValueFlow::Value strvalue;
            strvalue.valueType = ValueFlow::Value::ValueType::TOK;
            strvalue.tokvalue = tok;
            strvalue.setKnown();
            setTokenValue(tok, std::move(strvalue), settings);
        }
    }
}

static const Token* findTypeEnd(const Token* tok)
{
    while (Token::Match(tok, "%name%|::|<|(|*|&|&&") && !tok->isVariable()) {
        if (tok->link())
            tok = tok->link();
        tok = tok->next();
    }
    return tok;
}

static std::vector<const Token*> evaluateType(const Token* start, const Token* end)
{
    if (!start)
        return {};
    if (!end)
        return {};
    std::vector<const Token*> result;
    for (const Token* tok = start; tok != end; tok = tok->next()) {
        if (!Token::Match(tok, "%name%|::|<|(|*|&|&&"))
            return {};
        if (Token::simpleMatch(tok, "decltype (")) {
            if (Token::Match(tok->next(), "( %name% )")) {
                const Token* vartok = tok->tokAt(2);
                if (vartok->function() && !vartok->variable()) {
                    result.push_back(vartok);
                } else {
                    auto t = Token::typeDecl(vartok);
                    if (!t.first || !t.second)
                        return {};
                    auto inner = evaluateType(t.first, t.second);
                    if (inner.empty())
                        return {};
                    result.insert(result.end(), inner.begin(), inner.end());
                }
            } else if (Token::Match(tok->next(), "( %name% (|{") && Token::Match(tok->linkAt(3), "}|) )")) {
                const Token* ftok = tok->tokAt(3);
                auto t = Token::typeDecl(ftok);
                if (!t.first || !t.second)
                    return {};
                auto inner = evaluateType(t.first, t.second);
                if (inner.empty())
                    return {};
                result.insert(result.end(), inner.begin(), inner.end());
            } else {
                // We cant evaluate the decltype so bail
                return {};
            }
            tok = tok->linkAt(1);

        } else {
            if (tok->link()) {
                auto inner = evaluateType(tok->next(), tok->link());
                if (inner.empty())
                    return {};
                result.push_back(tok);
                result.insert(result.end(), inner.begin(), inner.end());
                tok = tok->link();
            }
            result.push_back(tok);
        }
    }
    return result;
}

static bool hasUnknownType(const std::vector<const Token*>& toks)
{
    if (toks.empty())
        return true;
    return std::any_of(toks.begin(), toks.end(), [&](const Token* tok) {
        if (!tok)
            return true;
        if (Token::Match(tok, "const|volatile|&|*|&&|%type%|::"))
            return false;
        if (Token::Match(tok, "%name% :: %name%"))
            return false;
        if (tok->type())
            return false;
        return true;
    });
}

static void stripCV(std::vector<const Token*>& toks)
{
    auto it =
        std::find_if(toks.begin(), toks.end(), [&](const Token* tok) {
        return !Token::Match(tok, "const|volatile");
    });
    if (it == toks.begin())
        return;
    toks.erase(toks.begin(), it);
}

static std::vector<std::vector<const Token*>> evaluateTemplateArgs(const Token* tok)
{
    std::vector<std::vector<const Token*>> result;
    while (tok) {
        const Token* next = tok->nextTemplateArgument();
        const Token* end = next ? next->previous() : findTypeEnd(tok);
        result.push_back(evaluateType(tok, end));
        tok = next;
    }
    return result;
}

static void valueFlowTypeTraits(TokenList& tokenlist, const Settings& settings)
{
    std::unordered_map<std::string, std::function<ValueFlow::Value(std::vector<std::vector<const Token*>> args)>> eval;
    eval["is_void"] = [&](std::vector<std::vector<const Token*>> args) {
        if (args.size() != 1)
            return ValueFlow::Value::unknown();
        stripCV(args[0]);
        if (args[0].size() == 1 && args[0][0]->str() == "void")
            return ValueFlow::Value(1);
        if (!hasUnknownType(args[0]))
            return ValueFlow::Value(0);
        return ValueFlow::Value::unknown();
    };
    eval["is_lvalue_reference"] = [&](const std::vector<std::vector<const Token*>>& args) {
        if (args.size() != 1)
            return ValueFlow::Value::unknown();
        if (args[0].back()->str() == "&")
            return ValueFlow::Value(1);
        if (!hasUnknownType(args[0]))
            return ValueFlow::Value(0);
        return ValueFlow::Value::unknown();
    };
    eval["is_rvalue_reference"] = [&](const std::vector<std::vector<const Token*>>& args) {
        if (args.size() != 1)
            return ValueFlow::Value::unknown();
        if (args[0].back()->str() == "&&")
            return ValueFlow::Value(1);
        if (!hasUnknownType(args[0]))
            return ValueFlow::Value(0);
        return ValueFlow::Value::unknown();
    };
    eval["is_reference"] = [&](const std::vector<std::vector<const Token*>>& args) {
        if (args.size() != 1)
            return ValueFlow::Value::unknown();
        ValueFlow::Value isRValue = eval["is_rvalue_reference"](args);
        if (isRValue.isUninitValue() || isRValue.intvalue == 1)
            return isRValue;
        return eval["is_lvalue_reference"](args);
    };
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {

        if (!Token::Match(tok, "std :: %name% <"))
            continue;
        Token* templateTok = tok->tokAt(3);
        Token* updateTok = nullptr;
        std::string traitName = tok->strAt(2);
        if (endsWith(traitName, "_v")) {
            traitName.pop_back();
            traitName.pop_back();
            updateTok = tok->next();
        } else if (Token::simpleMatch(templateTok->link(), "> { }") ||
                   Token::simpleMatch(templateTok->link(), "> :: value")) {
            updateTok = templateTok->link()->next();
        }
        if (!updateTok)
            continue;
        if (updateTok->hasKnownIntValue())
            continue;
        if (eval.count(traitName) == 0)
            continue;
        auto args = evaluateTemplateArgs(templateTok->next());
        if (std::any_of(args.begin(), args.end(), [](const std::vector<const Token*>& arg) {
            return arg.empty();
        }))
            continue;
        ValueFlow::Value value = eval[traitName](std::move(args));
        if (value.isUninitValue())
            continue;
        value.setKnown();
        ValueFlow::setTokenValue(updateTok, std::move(value), settings);
    }
}

static void valueFlowArray(TokenList& tokenlist, const Settings& settings)
{
    std::map<nonneg int, const Token*> constantArrays;

    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->varId() > 0) {
            // array
            const auto it = utils::as_const(constantArrays).find(tok->varId());
            if (it != constantArrays.end()) {
                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::TOK;
                value.tokvalue = it->second;
                value.setKnown();
                setTokenValue(tok, std::move(value), settings);
            }

            // const array decl
            else if (tok->variable() && tok->variable()->isArray() && tok->variable()->isConst() &&
                     tok->variable()->nameToken() == tok && Token::Match(tok, "%var% [ %num%| ] = {")) {
                Token* rhstok = tok->linkAt(1)->tokAt(2);
                constantArrays[tok->varId()] = rhstok;
                tok = rhstok->link();
            }

            // pointer = array
            else if (tok->variable() && tok->variable()->isArray() && Token::simpleMatch(tok->astParent(), "=") &&
                     astIsRHS(tok) && tok->astParent()->astOperand1() && tok->astParent()->astOperand1()->variable() &&
                     tok->astParent()->astOperand1()->variable()->isPointer()) {
                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::TOK;
                value.tokvalue = tok;
                value.setKnown();
                setTokenValue(tok, std::move(value), settings);
            }
            continue;
        }

        if (Token::Match(tok, "const %type% %var% [ %num%| ] = {")) {
            Token* vartok = tok->tokAt(2);
            Token* rhstok = vartok->linkAt(1)->tokAt(2);
            constantArrays[vartok->varId()] = rhstok;
            tok = rhstok->link();
            continue;
        }

        if (Token::Match(tok, "const char %var% [ %num%| ] = %str% ;")) {
            Token* vartok = tok->tokAt(2);
            Token* strtok = vartok->linkAt(1)->tokAt(2);
            constantArrays[vartok->varId()] = strtok;
            tok = strtok->next();
            continue;
        }
    }
}

static bool isNonZero(const Token* tok)
{
    return tok && (!tok->hasKnownIntValue() || tok->getKnownIntValue() != 0);
}

static const Token* getOtherOperand(const Token* tok)
{
    if (!tok)
        return nullptr;
    if (!tok->astParent())
        return nullptr;
    if (tok->astParent()->astOperand1() != tok)
        return tok->astParent()->astOperand1();
    if (tok->astParent()->astOperand2() != tok)
        return tok->astParent()->astOperand2();
    return nullptr;
}

static void valueFlowArrayBool(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->hasKnownIntValue())
            continue;
        const Variable* var = nullptr;
        bool known = false;
        const auto val =
            std::find_if(tok->values().cbegin(), tok->values().cend(), std::mem_fn(&ValueFlow::Value::isTokValue));
        if (val == tok->values().end()) {
            var = tok->variable();
            known = true;
        } else {
            var = val->tokvalue->variable();
            known = val->isKnown();
        }
        if (!var)
            continue;
        if (!var->isArray() || var->isArgument() || var->isStlType())
            continue;
        if (isNonZero(getOtherOperand(tok)) && Token::Match(tok->astParent(), "%comp%"))
            continue;
        // TODO: Check for function argument
        if ((astIsBool(tok->astParent()) && !Token::Match(tok->astParent(), "(|%name%")) ||
            (tok->astParent() && Token::Match(tok->astParent()->previous(), "if|while|for ("))) {
            ValueFlow::Value value{1};
            if (known)
                value.setKnown();
            setTokenValue(tok, std::move(value), settings);
        }
    }
}

static void valueFlowArrayElement(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->hasKnownIntValue())
            continue;
        const Token* indexTok = nullptr;
        const Token* arrayTok = nullptr;
        if (Token::simpleMatch(tok, "[") && tok->isBinaryOp()) {
            indexTok = tok->astOperand2();
            arrayTok = tok->astOperand1();
        } else if (Token::Match(tok->tokAt(-2), ". %name% (") && astIsContainer(tok->tokAt(-2)->astOperand1())) {
            arrayTok = tok->tokAt(-2)->astOperand1();
            const Library::Container* container = getLibraryContainer(arrayTok);
            if (!container || container->stdAssociativeLike)
                continue;
            const Library::Container::Yield yield = container->getYield(tok->strAt(-1));
            if (yield != Library::Container::Yield::AT_INDEX)
                continue;
            indexTok = tok->astOperand2();
        }

        if (!indexTok || !arrayTok)
            continue;

        for (const ValueFlow::Value& arrayValue : arrayTok->values()) {
            if (!arrayValue.isTokValue())
                continue;
            if (arrayValue.isImpossible())
                continue;
            for (const ValueFlow::Value& indexValue : indexTok->values()) {
                if (!indexValue.isIntValue())
                    continue;
                if (indexValue.isImpossible())
                    continue;
                if (!arrayValue.isKnown() && !indexValue.isKnown() && arrayValue.varId != 0 && indexValue.varId != 0 &&
                    !(arrayValue.varId == indexValue.varId && arrayValue.varvalue == indexValue.varvalue))
                    continue;

                ValueFlow::Value result(0);
                result.condition = arrayValue.condition ? arrayValue.condition : indexValue.condition;
                result.setInconclusive(arrayValue.isInconclusive() || indexValue.isInconclusive());
                result.varId = (arrayValue.varId != 0) ? arrayValue.varId : indexValue.varId;
                result.varvalue = (result.varId == arrayValue.varId) ? arrayValue.intvalue : indexValue.intvalue;
                if (arrayValue.valueKind == indexValue.valueKind)
                    result.valueKind = arrayValue.valueKind;

                result.errorPath.insert(result.errorPath.end(),
                                        arrayValue.errorPath.cbegin(),
                                        arrayValue.errorPath.cend());
                result.errorPath.insert(result.errorPath.end(),
                                        indexValue.errorPath.cbegin(),
                                        indexValue.errorPath.cend());

                const MathLib::bigint index = indexValue.intvalue;

                if (arrayValue.tokvalue->tokType() == Token::eString) {
                    const std::string s = arrayValue.tokvalue->strValue();
                    if (index == s.size()) {
                        result.intvalue = 0;
                        setTokenValue(tok, std::move(result), settings);
                    } else if (index >= 0 && index < s.size()) {
                        result.intvalue = s[static_cast<std::size_t>(index)];
                        setTokenValue(tok, std::move(result), settings);
                    }
                } else if (Token::simpleMatch(arrayValue.tokvalue, "{")) {
                    std::vector<const Token*> args = getArguments(arrayValue.tokvalue);
                    if (index < 0 || index >= args.size())
                        continue;
                    const Token* arg = args[static_cast<std::size_t>(index)];
                    const ValueFlow::Value* v = arg->getKnownValue(ValueFlow::Value::ValueType::INT);
                    if (v) {
                        result.intvalue = v->intvalue;
                        result.errorPath.insert(result.errorPath.end(), v->errorPath.cbegin(), v->errorPath.cend());
                        setTokenValue(tok, std::move(result), settings);
                    }
                }
            }
        }
    }
}

static void valueFlowPointerAlias(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        // not address of
        if (!tok->isUnaryOp("&"))
            continue;

        // parent should be a '='
        if (!Token::simpleMatch(tok->astParent(), "="))
            continue;

        // child should be some buffer or variable
        const Token* vartok = tok->astOperand1();
        while (vartok) {
            if (vartok->str() == "[")
                vartok = vartok->astOperand1();
            else if (vartok->str() == "." || vartok->str() == "::")
                vartok = vartok->astOperand2();
            else
                break;
        }
        if (!(vartok && vartok->variable() && !vartok->variable()->isPointer()))
            continue;

        ValueFlow::Value value;
        value.valueType = ValueFlow::Value::ValueType::TOK;
        value.tokvalue = tok;
        setTokenValue(tok, std::move(value), settings);
    }
}

static void valueFlowBitAnd(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->str() != "&")
            continue;

        if (tok->hasKnownValue())
            continue;

        if (!tok->astOperand1() || !tok->astOperand2())
            continue;

        MathLib::bigint number;
        if (MathLib::isInt(tok->astOperand1()->str()))
            number = MathLib::toBigNumber(tok->astOperand1());
        else if (MathLib::isInt(tok->astOperand2()->str()))
            number = MathLib::toBigNumber(tok->astOperand2());
        else
            continue;

        int bit = 0;
        while (bit <= (MathLib::bigint_bits - 2) && ((static_cast<MathLib::bigint>(1) << bit) < number))
            ++bit;

        if ((static_cast<MathLib::bigint>(1) << bit) == number) {
            setTokenValue(tok, ValueFlow::Value(0), settings);
            setTokenValue(tok, ValueFlow::Value(number), settings);
        }
    }
}

static void valueFlowSameExpressions(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->hasKnownIntValue())
            continue;

        if (!tok->astOperand1() || !tok->astOperand2())
            continue;

        if (tok->astOperand1()->isLiteral() || tok->astOperand2()->isLiteral())
            continue;

        if (!astIsIntegral(tok->astOperand1(), false) && !astIsIntegral(tok->astOperand2(), false))
            continue;

        long long val;

        if (Token::Match(tok, "==|>=|<=|/")) {
            val = 1;
        }
        else if (Token::Match(tok, "!=|>|<|%|-")) {
            val = 0;
        }
        else
            continue;

        ValueFlow::Value value(val);
        value.setKnown();

        if (isSameExpression(false, tok->astOperand1(), tok->astOperand2(), settings, true, true, &value.errorPath)) {
            setTokenValue(tok, std::move(value), settings);
        }
    }
}

static bool getExpressionRange(const Token* expr, MathLib::bigint* minvalue, MathLib::bigint* maxvalue)
{
    if (const ValueFlow::Value* v = expr->getKnownValue(ValueFlow::Value::ValueType::INT)) {
        if (minvalue)
            *minvalue = v->intvalue;
        if (maxvalue)
            *maxvalue = v->intvalue;
        return true;
    }

    if (expr->str() == "&" && expr->astOperand1() && expr->astOperand2()) {
        MathLib::bigint vals[4];
        const bool lhsHasKnownRange = getExpressionRange(expr->astOperand1(), &vals[0], &vals[1]);
        const bool rhsHasKnownRange = getExpressionRange(expr->astOperand2(), &vals[2], &vals[3]);
        if (!lhsHasKnownRange && !rhsHasKnownRange)
            return false;
        if (!lhsHasKnownRange || !rhsHasKnownRange) {
            if (minvalue)
                *minvalue = lhsHasKnownRange ? vals[0] : vals[2];
            if (maxvalue)
                *maxvalue = lhsHasKnownRange ? vals[1] : vals[3];
        } else {
            if (minvalue)
                *minvalue = vals[0] & vals[2];
            if (maxvalue)
                *maxvalue = vals[1] & vals[3];
        }
        return true;
    }

    if (expr->str() == "%" && expr->astOperand1() && expr->astOperand2()) {
        MathLib::bigint vals[4];
        if (!getExpressionRange(expr->astOperand2(), &vals[2], &vals[3]))
            return false;
        if (vals[2] <= 0)
            return false;
        const bool lhsHasKnownRange = getExpressionRange(expr->astOperand1(), &vals[0], &vals[1]);
        if (lhsHasKnownRange && vals[0] < 0)
            return false;
        // If lhs has unknown value, it must be unsigned
        if (!lhsHasKnownRange &&
            (!expr->astOperand1()->valueType() || expr->astOperand1()->valueType()->sign != ValueType::Sign::UNSIGNED))
            return false;
        if (minvalue)
            *minvalue = 0;
        if (maxvalue)
            *maxvalue = vals[3] - 1;
        return true;
    }

    return false;
}

static void valueFlowRightShift(TokenList& tokenList, const Settings& settings)
{
    for (Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (tok->str() != ">>")
            continue;

        if (tok->hasKnownIntValue())
            continue;

        if (!tok->astOperand1() || !tok->astOperand2())
            continue;

        if (!tok->astOperand2()->hasKnownIntValue())
            continue;

        const MathLib::bigint rhsvalue = tok->astOperand2()->getKnownIntValue();
        if (rhsvalue < 0)
            continue;

        if (!tok->astOperand1()->valueType() || !tok->astOperand1()->valueType()->isIntegral())
            continue;

        if (!tok->astOperand2()->valueType() || !tok->astOperand2()->valueType()->isIntegral())
            continue;

        MathLib::bigint lhsmax = 0;
        if (!getExpressionRange(tok->astOperand1(), nullptr, &lhsmax))
            continue;
        if (lhsmax < 0)
            continue;
        std::uint8_t lhsbits;
        if ((tok->astOperand1()->valueType()->type == ValueType::Type::CHAR) ||
            (tok->astOperand1()->valueType()->type == ValueType::Type::SHORT) ||
            (tok->astOperand1()->valueType()->type == ValueType::Type::WCHAR_T) ||
            (tok->astOperand1()->valueType()->type == ValueType::Type::BOOL) ||
            (tok->astOperand1()->valueType()->type == ValueType::Type::INT))
            lhsbits = settings.platform.int_bit; // TODO: needs to use the proper *_bit fo each type
        else if (tok->astOperand1()->valueType()->type == ValueType::Type::LONG)
            lhsbits = settings.platform.long_bit;
        else if (tok->astOperand1()->valueType()->type == ValueType::Type::LONGLONG)
            lhsbits = settings.platform.long_long_bit;
        else
            continue;
        if (rhsvalue >= lhsbits || rhsvalue >= MathLib::bigint_bits || (1ULL << rhsvalue) <= lhsmax)
            continue;

        ValueFlow::Value val(0);
        val.setKnown();
        setTokenValue(tok, std::move(val), settings);
    }
}

static std::vector<MathLib::bigint> minUnsignedValue(const Token* tok, int depth = 8)
{
    std::vector<MathLib::bigint> result;
    if (!tok)
        return result;
    if (depth < 0)
        return result;
    if (const ValueFlow::Value* v = tok->getKnownValue(ValueFlow::Value::ValueType::INT)) {
        result = {v->intvalue};
    } else if (!Token::Match(tok, "-|%|&|^") && tok->isConstOp() && tok->astOperand1() && tok->astOperand2()) {
        std::vector<MathLib::bigint> op1 = minUnsignedValue(tok->astOperand1(), depth - 1);
        if (!op1.empty()) {
            std::vector<MathLib::bigint> op2 = minUnsignedValue(tok->astOperand2(), depth - 1);
            if (!op2.empty()) {
                result = calculate<std::vector<MathLib::bigint>>(tok->str(), op1.front(), op2.front());
            }
        }
    }
    if (result.empty() && astIsUnsigned(tok))
        result = {0};
    return result;
}

static bool isConvertedToIntegral(const Token* tok, const Settings& settings)
{
    if (!tok)
        return false;
    std::vector<ValueType> parentTypes = getParentValueTypes(tok, settings);
    if (parentTypes.empty())
        return false;
    const ValueType& vt = parentTypes.front();
    return vt.type != ValueType::UNKNOWN_INT && vt.isIntegral();
}

static bool isSameToken(const Token* tok1, const Token* tok2)
{
    if (!tok1 || !tok2)
        return false;
    if (tok1->exprId() != 0 && tok1->exprId() == tok2->exprId())
        return true;
    if (tok1->hasKnownIntValue() && tok2->hasKnownIntValue())
        return tok1->getKnownIntValue() == tok2->getKnownIntValue();
    return false;
}

static void valueFlowImpossibleValues(TokenList& tokenList, const Settings& settings)
{
    for (Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (tok->hasKnownIntValue())
            continue;
        if (Token::Match(tok, "%bool%"))
            continue;
        if (astIsBool(tok) || Token::Match(tok, "%comp%")) {
            ValueFlow::Value lower{-1};
            lower.bound = ValueFlow::Value::Bound::Upper;
            lower.setImpossible();
            setTokenValue(tok, std::move(lower), settings);

            ValueFlow::Value upper{2};
            upper.bound = ValueFlow::Value::Bound::Lower;
            upper.setImpossible();
            setTokenValue(tok, std::move(upper), settings);
        } else if (astIsUnsigned(tok) && !astIsPointer(tok)) {
            std::vector<MathLib::bigint> minvalue = minUnsignedValue(tok);
            if (minvalue.empty())
                continue;
            ValueFlow::Value value{std::max<MathLib::bigint>(0, minvalue.front()) - 1};
            value.bound = ValueFlow::Value::Bound::Upper;
            value.setImpossible();
            setTokenValue(tok, std::move(value), settings);
        }
        if (Token::simpleMatch(tok, "?") && Token::Match(tok->astOperand1(), "<|<=|>|>=")) {
            const Token* condTok = tok->astOperand1();
            const Token* branchesTok = tok->astOperand2();

            auto tokens = makeArray(condTok->astOperand1(), condTok->astOperand2());
            auto branches = makeArray(branchesTok->astOperand1(), branchesTok->astOperand2());
            bool flipped = false;
            if (std::equal(tokens.cbegin(), tokens.cend(), branches.crbegin(), &isSameToken))
                flipped = true;
            else if (!std::equal(tokens.cbegin(), tokens.cend(), branches.cbegin(), &isSameToken))
                continue;
            std::vector<ValueFlow::Value> values;
            for (const Token* tok2 : tokens) {
                if (const ValueFlow::Value* v = tok2->getKnownValue(ValueFlow::Value::ValueType::INT)) {
                    values.emplace_back(*v);
                } else {
                    ValueFlow::Value symValue{};
                    symValue.valueType = ValueFlow::Value::ValueType::SYMBOLIC;
                    symValue.tokvalue = tok2;
                    values.push_back(std::move(symValue));
                    std::copy_if(tok2->values().cbegin(),
                                 tok2->values().cend(),
                                 std::back_inserter(values),
                                 [](const ValueFlow::Value& v) {
                        if (!v.isKnown())
                            return false;
                        return v.isSymbolicValue();
                    });
                }
            }
            const bool isMin = Token::Match(condTok, "<|<=") ^ flipped;
            for (ValueFlow::Value& value : values) {
                value.setImpossible();
                if (isMin) {
                    value.intvalue++;
                    value.bound = ValueFlow::Value::Bound::Lower;
                } else {
                    value.intvalue--;
                    value.bound = ValueFlow::Value::Bound::Upper;
                }
                setTokenValue(tok, std::move(value), settings);
            }

        } else if (Token::simpleMatch(tok, "%") && tok->astOperand2() && tok->astOperand2()->hasKnownIntValue()) {
            ValueFlow::Value value{tok->astOperand2()->getKnownIntValue()};
            value.bound = ValueFlow::Value::Bound::Lower;
            value.setImpossible();
            setTokenValue(tok, std::move(value), settings);
        } else if (Token::Match(tok, "abs|labs|llabs|fabs|fabsf|fabsl (")) {
            ValueFlow::Value value{-1};
            value.bound = ValueFlow::Value::Bound::Upper;
            value.setImpossible();
            setTokenValue(tok->next(), std::move(value), settings);
        } else if (Token::Match(tok, ". data|c_str (") && astIsContainerOwned(tok->astOperand1())) {
            const Library::Container* container = getLibraryContainer(tok->astOperand1());
            if (!container)
                continue;
            if (!container->stdStringLike)
                continue;
            if (container->view)
                continue;
            ValueFlow::Value value{0};
            value.setImpossible();
            setTokenValue(tok->tokAt(2), std::move(value), settings);
        } else if (Token::Match(tok, "make_shared|make_unique <") && Token::simpleMatch(tok->linkAt(1), "> (")) {
            ValueFlow::Value value{0};
            value.setImpossible();
            setTokenValue(tok->linkAt(1)->next(), std::move(value), settings);
        } else if ((tokenList.isCPP() && Token::simpleMatch(tok, "this")) || tok->isUnaryOp("&")) {
            ValueFlow::Value value{0};
            value.setImpossible();
            setTokenValue(tok, std::move(value), settings);
        } else if (tok->variable() && tok->variable()->isArray() && !tok->variable()->isArgument() &&
                   !tok->variable()->isStlType()) {
            ValueFlow::Value value{0};
            value.setImpossible();
            setTokenValue(tok, std::move(value), settings);
        } else if (tok->isIncompleteVar() && tok->astParent() && tok->astParent()->isUnaryOp("-") &&
                   isConvertedToIntegral(tok->astParent(), settings)) {
            ValueFlow::Value value{0};
            value.setImpossible();
            setTokenValue(tok, std::move(value), settings);
        }
    }
}

static void valueFlowEnumValue(SymbolDatabase & symboldatabase, const Settings & settings)
{
    for (Scope & scope : symboldatabase.scopeList) {
        if (scope.type != ScopeType::eEnum)
            continue;
        MathLib::bigint value = 0;
        bool prev_enum_is_known = true;

        for (Enumerator & enumerator : scope.enumeratorList) {
            if (enumerator.start) {
                auto* rhs = const_cast<Token*>(enumerator.start->previous()->astOperand2());
                ValueFlow::valueFlowConstantFoldAST(rhs, settings);
                if (rhs && rhs->hasKnownIntValue()) {
                    enumerator.value = rhs->getKnownIntValue();
                    enumerator.value_known = true;
                    value = enumerator.value + 1;
                    prev_enum_is_known = true;
                } else
                    prev_enum_is_known = false;
            } else if (prev_enum_is_known) {
                enumerator.value = value++;
                enumerator.value_known = true;
            }
        }
    }
}

static void valueFlowGlobalConstVar(TokenList& tokenList, const Settings& settings)
{
    // Get variable values...
    std::map<const Variable*, ValueFlow::Value> vars;
    for (const Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (!tok->variable())
            continue;
        // Initialization...
        if (tok == tok->variable()->nameToken() && !tok->variable()->isVolatile() && !tok->variable()->isArgument() &&
            tok->variable()->isConst() && tok->valueType() && tok->valueType()->isIntegral() &&
            tok->valueType()->pointer == 0 && tok->valueType()->constness == 1 && Token::Match(tok, "%name% =") &&
            tok->next()->astOperand2() && tok->next()->astOperand2()->hasKnownIntValue()) {
            vars[tok->variable()] = *tok->next()->astOperand2()->getKnownValue(ValueFlow::Value::ValueType::INT);
        }
    }

    // Set values..
    for (Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (!tok->variable())
            continue;
        const auto var = utils::as_const(vars).find(tok->variable());
        if (var == vars.end())
            continue;
        setTokenValue(tok, var->second, settings);
    }
}

static void valueFlowGlobalStaticVar(TokenList& tokenList, const Settings& settings)
{
    // Get variable values...
    std::map<const Variable*, ValueFlow::Value> vars;
    for (const Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (!tok->variable())
            continue;
        // Initialization...
        if (tok == tok->variable()->nameToken() && tok->variable()->isStatic() && !tok->variable()->isConst() &&
            tok->valueType() && tok->valueType()->isIntegral() && tok->valueType()->pointer == 0 &&
            tok->valueType()->constness == 0 && Token::Match(tok, "%name% =") && tok->next()->astOperand2() &&
            tok->next()->astOperand2()->hasKnownIntValue()) {
            vars[tok->variable()] = *tok->next()->astOperand2()->getKnownValue(ValueFlow::Value::ValueType::INT);
        } else {
            // If variable is written anywhere in TU then remove it from vars
            if (!tok->astParent())
                continue;
            if (Token::Match(tok->astParent(), "++|--|&") && !tok->astParent()->astOperand2())
                vars.erase(tok->variable());
            else if (tok->astParent()->isAssignmentOp()) {
                if (tok == tok->astParent()->astOperand1())
                    vars.erase(tok->variable());
                else if (tok->isCpp() && Token::Match(tok->astParent()->tokAt(-2), "& %name% ="))
                    vars.erase(tok->variable());
            } else if (isLikelyStreamRead(tok->astParent())) {
                vars.erase(tok->variable());
            } else if (Token::Match(tok->astParent(), "[(,]"))
                vars.erase(tok->variable());
        }
    }

    // Set values..
    for (Token* tok = tokenList.front(); tok; tok = tok->next()) {
        if (!tok->variable())
            continue;
        const auto var = utils::as_const(vars).find(tok->variable());
        if (var == vars.end())
            continue;
        setTokenValue(tok, var->second, settings);
    }
}

static Analyzer::Result valueFlowForward(Token* startToken,
                                         const Token* endToken,
                                         const Token* exprTok,
                                         ValueFlow::Value value,
                                         const TokenList& tokenlist,
                                         ErrorLogger& errorLogger,
                                         const Settings& settings,
                                         SourceLocation loc = SourceLocation::current())
{
    if (settings.debugnormal)
        setSourceLocation(value, loc, startToken);
    return valueFlowGenericForward(startToken,
                                   endToken,
                                   makeAnalyzer(exprTok, std::move(value), settings),
                                   tokenlist,
                                   errorLogger,
                                   settings);
}

static Analyzer::Result valueFlowForward(Token* startToken,
                                         const Token* endToken,
                                         const Token* exprTok,
                                         std::list<ValueFlow::Value> values,
                                         const TokenList& tokenlist,
                                         ErrorLogger& errorLogger,
                                         const Settings& settings,
                                         SourceLocation loc = SourceLocation::current())
{
    Analyzer::Result result{};
    for (ValueFlow::Value& v : values) {
        result.update(valueFlowForward(startToken, endToken, exprTok, std::move(v), tokenlist, errorLogger, settings, loc));
    }
    return result;
}

template<class ValueOrValues>
static Analyzer::Result valueFlowForward(Token* startToken,
                                         const Token* exprTok,
                                         ValueOrValues v,
                                         const TokenList& tokenlist,
                                         ErrorLogger& errorLogger,
                                         const Settings& settings,
                                         SourceLocation loc = SourceLocation::current())
{
    const Token* endToken = nullptr;
    const Function* f = Scope::nestedInFunction(startToken->scope());
    if (f && f->functionScope)
        endToken = f->functionScope->bodyEnd;
    if (!endToken && exprTok && exprTok->variable() && !exprTok->variable()->isLocal())
        endToken = startToken->scope()->bodyEnd;
    return valueFlowForward(startToken, endToken, exprTok, std::move(v), tokenlist, errorLogger, settings, loc);
}

static Analyzer::Result valueFlowForwardRecursive(Token* top,
                                                  const Token* exprTok,
                                                  std::list<ValueFlow::Value> values,
                                                  const TokenList& tokenlist,
                                                  ErrorLogger& errorLogger,
                                                  const Settings& settings,
                                                  SourceLocation loc = SourceLocation::current())
{
    Analyzer::Result result{};
    for (ValueFlow::Value& v : values) {
        if (settings.debugnormal)
            setSourceLocation(v, loc, top);
        result.update(
            valueFlowGenericForward(top, makeAnalyzer(exprTok, std::move(v), settings), tokenlist, errorLogger, settings));
    }
    return result;
}

static void valueFlowReverse(Token* tok,
                             const Token* const endToken,
                             const Token* const varToken,
                             std::list<ValueFlow::Value> values,
                             const TokenList& tokenlist,
                             ErrorLogger& errorLogger,
                             const Settings& settings,
                             SourceLocation loc = SourceLocation::current())
{
    for (ValueFlow::Value& v : values) {
        if (settings.debugnormal)
            setSourceLocation(v, loc, tok);
        valueFlowGenericReverse(tok,
                                endToken,
                                makeReverseAnalyzer(varToken, std::move(v), settings),
                                tokenlist,
                                errorLogger,
                                settings);
    }
}

// Deprecated
static void valueFlowReverse(const TokenList& tokenlist,
                             Token* tok,
                             const Token* const varToken,
                             ValueFlow::Value val,
                             ErrorLogger& errorLogger,
                             const Settings& settings,
                             SourceLocation loc = SourceLocation::current())
{
    valueFlowReverse(tok, nullptr, varToken, {std::move(val)}, tokenlist, errorLogger, settings, loc);
}

static bool isConditionKnown(const Token* tok, bool then)
{
    const char* op = "||";
    if (then)
        op = "&&";
    const Token* parent = tok->astParent();
    while (parent && (parent->str() == op || parent->str() == "!" || parent->isCast()))
        parent = parent->astParent();
    const Token* top = tok->astTop();
    if (Token::Match(top->previous(), "if|while|for ("))
        return parent == top || Token::simpleMatch(parent, ";");
    return parent && parent->str() != op;
}

enum class LifetimeCapture : std::uint8_t { Undefined, ByValue, ByReference };

static std::string lifetimeType(const Token *tok, const ValueFlow::Value *val)
{
    if (!val)
        return "object";
    switch (val->lifetimeKind) {
    case ValueFlow::Value::LifetimeKind::Lambda:
        return "lambda";
    case ValueFlow::Value::LifetimeKind::Iterator:
        return "iterator";
    case ValueFlow::Value::LifetimeKind::Object:
    case ValueFlow::Value::LifetimeKind::SubObject:
    case ValueFlow::Value::LifetimeKind::Address:
        if (astIsPointer(tok))
            return "pointer";
        if (Token::simpleMatch(tok, "=") && astIsPointer(tok->astOperand2()))
            return "pointer";
        return "object";
    }

    cppcheck::unreachable();
}

std::string ValueFlow::lifetimeMessage(const Token *tok, const ValueFlow::Value *val, ErrorPath &errorPath)
{
    const Token *tokvalue = val ? val->tokvalue : nullptr;
    const Variable *tokvar = tokvalue ? tokvalue->variable() : nullptr;
    const Token *vartok = tokvar ? tokvar->nameToken() : nullptr;
    const bool classVar = tokvar ? (!tokvar->isLocal() && !tokvar->isArgument() && !tokvar->isGlobal()) : false;
    std::string type = lifetimeType(tok, val);
    std::string msg = type;
    if (vartok) {
        if (!classVar)
            errorPath.emplace_back(vartok, "Variable created here.");
        const Variable * var = vartok->variable();
        if (var) {
            std::string submessage;
            switch (val->lifetimeKind) {
            case ValueFlow::Value::LifetimeKind::SubObject:
            case ValueFlow::Value::LifetimeKind::Object:
            case ValueFlow::Value::LifetimeKind::Address:
                if (type == "pointer")
                    submessage = " to local variable";
                else
                    submessage = " that points to local variable";
                break;
            case ValueFlow::Value::LifetimeKind::Lambda:
                submessage = " that captures local variable";
                break;
            case ValueFlow::Value::LifetimeKind::Iterator:
                submessage = " to local container";
                break;
            }
            if (classVar)
                submessage.replace(submessage.find("local"), 5, "member");
            msg += submessage + " '" + var->name() + "'";
        }
    }
    return msg;
}

std::vector<ValueFlow::Value> ValueFlow::getLifetimeObjValues(const Token* tok, bool inconclusive, MathLib::bigint path)
{
    std::vector<ValueFlow::Value> result;
    auto pred = [&](const ValueFlow::Value& v) {
        if (!v.isLocalLifetimeValue() && !(path != 0 && v.isSubFunctionLifetimeValue()))
            return false;
        if (!inconclusive && v.isInconclusive())
            return false;
        if (!v.tokvalue)
            return false;
        if (path >= 0 && v.path != 0 && v.path != path)
            return false;
        return true;
    };
    std::copy_if(tok->values().cbegin(), tok->values().cend(), std::back_inserter(result), pred);
    return result;
}

static bool hasUniqueOwnership(const Token* tok)
{
    if (!tok)
        return false;
    const Variable* var = tok->variable();
    if (var && var->isArray() && !var->isArgument())
        return true;
    if (astIsPointer(tok))
        return false;
    if (astIsUniqueSmartPointer(tok))
        return true;
    if (astIsContainerOwned(tok))
        return true;
    return false;
}

// Check if dereferencing an object that doesn't have unique ownership
static bool derefShared(const Token* tok)
{
    if (!tok)
        return false;
    if (!tok->isUnaryOp("*") && tok->str() != "[" && tok->str() != ".")
        return false;
    if (tok->str() == "." && tok->originalName() != "->")
        return false;
    const Token* ptrTok = tok->astOperand1();
    return !hasUniqueOwnership(ptrTok);
}

ValueFlow::Value ValueFlow::getLifetimeObjValue(const Token *tok, bool inconclusive)
{
    std::vector<ValueFlow::Value> values = ValueFlow::getLifetimeObjValues(tok, inconclusive);
    // There should only be one lifetime
    if (values.size() != 1)
        return ValueFlow::Value{};
    return values.front();
}

template<class Predicate>
static std::vector<ValueFlow::LifetimeToken> getLifetimeTokens(const Token* tok,
                                                               bool escape,
                                                               ErrorPath errorPath,
                                                               Predicate pred,
                                                               const Settings& settings,
                                                               int depth = 20)
{
    if (!tok)
        return std::vector<ValueFlow::LifetimeToken> {};
    if (Token::simpleMatch(tok, "..."))
        return std::vector<ValueFlow::LifetimeToken>{};
    const Variable *var = tok->variable();
    if (pred(tok))
        return {{tok, std::move(errorPath)}};
    if (depth < 0)
        return {{tok, std::move(errorPath)}};
    if (var && var->declarationId() == tok->varId()) {
        if (var->isReference() || var->isRValueReference()) {
            const Token * const varDeclEndToken = var->declEndToken();
            if (!varDeclEndToken)
                return {{tok, true, std::move(errorPath)}};
            if (var->isArgument()) {
                errorPath.emplace_back(varDeclEndToken, "Passed to reference.");
                return {{tok, true, std::move(errorPath)}};
            }
            if (Token::Match(varDeclEndToken, "=|{")) {
                errorPath.emplace_back(varDeclEndToken, "Assigned to reference.");
                const Token *vartok = varDeclEndToken->astOperand2();
                const bool temporary = isTemporary(vartok, nullptr, true);
                const bool nonlocal = var->isStatic() || var->isGlobal();
                if (vartok == tok || (nonlocal && temporary) ||
                    (!escape && (var->isConst() || var->isRValueReference()) && temporary))
                    return {{tok, true, std::move(errorPath)}};
                if (vartok)
                    return getLifetimeTokens(vartok, escape, std::move(errorPath), pred, settings, depth - 1);
            } else if (Token::simpleMatch(var->nameToken()->astParent(), ":") &&
                       var->nameToken()->astParent()->astParent() &&
                       Token::simpleMatch(var->nameToken()->astParent()->astParent()->previous(), "for (")) {
                errorPath.emplace_back(var->nameToken(), "Assigned to reference.");
                const Token* vartok = var->nameToken();
                if (vartok == tok)
                    return {{tok, true, std::move(errorPath)}};
                const Token* contok = var->nameToken()->astParent()->astOperand2();
                if (astIsContainer(contok))
                    return ValueFlow::LifetimeToken::setAddressOf(
                        getLifetimeTokens(contok, escape, std::move(errorPath), pred, settings, depth - 1),
                        false);
                return std::vector<ValueFlow::LifetimeToken>{};
            } else {
                return std::vector<ValueFlow::LifetimeToken> {};
            }
        }
    } else if (Token::Match(tok->previous(), "%name% (")) {
        const Function *f = tok->previous()->function();
        if (f) {
            if (!Function::returnsReference(f))
                return {{tok, std::move(errorPath)}};
            std::vector<ValueFlow::LifetimeToken> result;
            std::vector<const Token*> returns = Function::findReturns(f);
            for (const Token* returnTok : returns) {
                if (returnTok == tok)
                    continue;
                for (ValueFlow::LifetimeToken& lt : getLifetimeTokens(returnTok, escape, errorPath, pred, settings, depth - returns.size())) {
                    const Token* argvarTok = lt.token;
                    const Variable* argvar = argvarTok->variable();
                    const Token* argTok = nullptr;
                    if (argvar && argvar->isArgument() && (argvar->isReference() || argvar->isRValueReference())) {
                        const int n = getArgumentPos(argvar, f);
                        if (n < 0)
                            return std::vector<ValueFlow::LifetimeToken> {};
                        std::vector<const Token*> args = getArguments(tok->previous());
                        // TODO: Track lifetimes of default parameters
                        if (n >= args.size())
                            return std::vector<ValueFlow::LifetimeToken> {};
                        argTok = args[n];
                        lt.errorPath.emplace_back(returnTok, "Return reference.");
                        lt.errorPath.emplace_back(tok->previous(), "Called function passing '" + argTok->expressionString() + "'.");
                    } else if (Token::Match(tok->tokAt(-2), ". %name% (") && !derefShared(tok->tokAt(-2)) &&
                               exprDependsOnThis(argvarTok)) {
                        argTok = tok->tokAt(-2)->astOperand1();
                        lt.errorPath.emplace_back(returnTok, "Return reference that depends on 'this'.");
                        lt.errorPath.emplace_back(tok->previous(),
                                                  "Calling member function on '" + argTok->expressionString() + "'.");
                    }
                    if (argTok) {
                        std::vector<ValueFlow::LifetimeToken> arglts = ValueFlow::LifetimeToken::setInconclusive(
                            getLifetimeTokens(argTok, escape, std::move(lt.errorPath), pred, settings, depth - returns.size()),
                            returns.size() > 1);
                        result.insert(result.end(), arglts.cbegin(), arglts.cend());
                    }
                }
            }
            return result;
        }
        if (Token::Match(tok->tokAt(-2), ". %name% (") && tok->tokAt(-2)->originalName() != "->" && astIsContainer(tok->tokAt(-2)->astOperand1())) {
            const Library::Container* library = getLibraryContainer(tok->tokAt(-2)->astOperand1());
            const Library::Container::Yield y = library->getYield(tok->strAt(-1));
            if (y == Library::Container::Yield::AT_INDEX || y == Library::Container::Yield::ITEM) {
                errorPath.emplace_back(tok->previous(), "Accessing container.");
                return ValueFlow::LifetimeToken::setAddressOf(
                    getLifetimeTokens(tok->tokAt(-2)->astOperand1(), escape, std::move(errorPath), pred, settings, depth - 1),
                    false);
            }
        }
    } else if (Token::Match(tok, ".|::|[") || tok->isUnaryOp("*")) {

        const Token *vartok = tok;
        while (vartok) {
            if (vartok->str() == "[" || vartok->isUnaryOp("*"))
                vartok = vartok->astOperand1();
            else if (vartok->str() == ".") {
                if (!Token::simpleMatch(vartok->astOperand1(), ".") &&
                    !(vartok->astOperand2() && vartok->astOperand2()->valueType() && vartok->astOperand2()->valueType()->reference != Reference::None))
                    vartok = vartok->astOperand1();
                else
                    break;
            }
            else if (vartok->str() == "::")
                vartok = vartok->astOperand2();
            else
                break;
        }

        if (!vartok)
            return {{tok, std::move(errorPath)}};
        if (derefShared(vartok->astParent())) {
            for (const ValueFlow::Value &v : vartok->values()) {
                if (!v.isLocalLifetimeValue())
                    continue;
                if (v.tokvalue == tok)
                    continue;
                errorPath.insert(errorPath.end(), v.errorPath.cbegin(), v.errorPath.cend());
                return ValueFlow::LifetimeToken::setAddressOf(
                    getLifetimeTokens(v.tokvalue, escape, std::move(errorPath), pred, settings, depth - 1),
                    false);
            }
        } else {
            return ValueFlow::LifetimeToken::setAddressOf(
                getLifetimeTokens(vartok, escape, std::move(errorPath), pred, settings, depth - 1), false);
        }
    } else if (Token::simpleMatch(tok, "{") && getArgumentStart(tok) &&
               !Token::simpleMatch(getArgumentStart(tok), ",") && getArgumentStart(tok)->valueType()) {
        const Token* vartok = getArgumentStart(tok);
        auto vts = getParentValueTypes(tok, settings);
        auto it = std::find_if(vts.cbegin(), vts.cend(), [&](const ValueType& vt) {
            return vt.isTypeEqual(vartok->valueType());
        });
        if (it != vts.end())
            return getLifetimeTokens(vartok, escape, std::move(errorPath), pred, settings, depth - 1);
    }
    return {{tok, std::move(errorPath)}};
}

std::vector<ValueFlow::LifetimeToken> ValueFlow::getLifetimeTokens(const Token* tok, const Settings& settings, bool escape, ErrorPath errorPath)
{
    return getLifetimeTokens(tok, escape, std::move(errorPath), [](const Token*) {
        return false;
    }, settings);
}

bool ValueFlow::hasLifetimeToken(const Token* tok, const Token* lifetime, const Settings& settings)
{
    bool result = false;
    getLifetimeTokens(tok, false, ErrorPath{}, [&](const Token* tok2) {
        result = tok2->exprId() == lifetime->exprId();
        return result;
    }, settings);
    return result;
}

static const Token* getLifetimeToken(const Token* tok, ErrorPath& errorPath, const Settings& settings, bool* addressOf = nullptr)
{
    std::vector<ValueFlow::LifetimeToken> lts = ValueFlow::getLifetimeTokens(tok, settings);
    if (lts.size() != 1)
        return nullptr;
    if (lts.front().inconclusive)
        return nullptr;
    if (addressOf)
        *addressOf = lts.front().addressOf;
    errorPath.insert(errorPath.end(), lts.front().errorPath.cbegin(), lts.front().errorPath.cend());
    return lts.front().token;
}

const Variable* ValueFlow::getLifetimeVariable(const Token* tok, ErrorPath& errorPath, const Settings& settings, bool* addressOf)
{
    const Token* tok2 = getLifetimeToken(tok, errorPath, settings, addressOf);
    if (tok2 && tok2->variable())
        return tok2->variable();
    return nullptr;
}

const Variable* ValueFlow::getLifetimeVariable(const Token* tok, const Settings& settings)
{
    ErrorPath errorPath;
    return getLifetimeVariable(tok, errorPath, settings, nullptr);
}

static bool isNotLifetimeValue(const ValueFlow::Value& val)
{
    return !val.isLifetimeValue();
}

static bool isLifetimeOwned(const ValueType* vtParent)
{
    if (vtParent->container)
        return !vtParent->container->view;
    return vtParent->type == ValueType::CONTAINER;
}

static bool isLifetimeOwned(const ValueType *vt, const ValueType *vtParent)
{
    if (!vtParent)
        return false;
    if (isLifetimeOwned(vtParent))
        return true;
    if (!vt)
        return false;
    // If converted from iterator to pointer then the iterator is most likely a pointer
    if (vtParent->pointer == 1 && vt->pointer == 0 && vt->type == ValueType::ITERATOR)
        return false;
    if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE) {
        if (vt->pointer != vtParent->pointer)
            return true;
        if (vt->type != vtParent->type) {
            if (vtParent->type == ValueType::RECORD)
                return true;
            if (isLifetimeOwned(vtParent))
                return true;
        }
    }

    return false;
}

static bool isLifetimeBorrowed(const ValueType *vt, const ValueType *vtParent)
{
    if (!vtParent)
        return false;
    if (!vt)
        return false;
    if (vt->pointer > 0 && vt->pointer == vtParent->pointer)
        return true;
    if (vtParent->container && vtParent->container->view)
        return true;
    if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE && vtParent->container == vt->container) {
        if (vtParent->pointer > vt->pointer)
            return true;
        if (vtParent->pointer < vt->pointer && vtParent->isIntegral())
            return true;
        if (vtParent->str() == vt->str())
            return true;
    }

    return false;
}

static const Token* skipCVRefs(const Token* tok, const Token* endTok)
{
    while (tok != endTok && Token::Match(tok, "const|volatile|auto|&|&&"))
        tok = tok->next();
    return tok;
}

static bool isNotEqual(std::pair<const Token*, const Token*> x, std::pair<const Token*, const Token*> y)
{
    const Token* start1 = x.first;
    const Token* start2 = y.first;
    if (start1 == nullptr || start2 == nullptr)
        return false;
    while (start1 != x.second && start2 != y.second) {
        const Token* tok1 = skipCVRefs(start1, x.second);
        if (tok1 != start1) {
            start1 = tok1;
            continue;
        }
        const Token* tok2 = skipCVRefs(start2, y.second);
        if (tok2 != start2) {
            start2 = tok2;
            continue;
        }
        if (start1->str() != start2->str())
            return true;
        start1 = start1->next();
        start2 = start2->next();
    }
    start1 = skipCVRefs(start1, x.second);
    start2 = skipCVRefs(start2, y.second);
    return !(start1 == x.second && start2 == y.second);
}
static bool isNotEqual(std::pair<const Token*, const Token*> x, const std::string& y, bool cpp, const Settings& settings)
{
    TokenList tokenList(settings, cpp ? Standards::Language::CPP : Standards::Language::C);
    std::istringstream istr(y);
    tokenList.createTokens(istr); // TODO: check result?
    return isNotEqual(x, std::make_pair(tokenList.front(), tokenList.back()));
}
static bool isNotEqual(std::pair<const Token*, const Token*> x, const ValueType* y, bool cpp, const Settings& settings)
{
    if (y == nullptr)
        return false;
    if (y->originalTypeName.empty())
        return false;
    return isNotEqual(x, y->originalTypeName, cpp, settings);
}

static bool isDifferentType(const Token* src, const Token* dst, const Settings& settings)
{
    const Type* t = Token::typeOf(src);
    const Type* parentT = Token::typeOf(dst);
    if (t && parentT) {
        if (t->classDef && parentT->classDef && t->classDef != parentT->classDef)
            return true;
    } else {
        std::pair<const Token*, const Token*> decl = Token::typeDecl(src);
        std::pair<const Token*, const Token*> parentdecl = Token::typeDecl(dst);
        const bool isCpp = (src && src->isCpp()) || (dst && dst->isCpp());
        if (isNotEqual(decl, parentdecl) && !(isCpp && (Token::simpleMatch(decl.first, "auto") || Token::simpleMatch(parentdecl.first, "auto"))))
            return true;
        if (isNotEqual(decl, dst->valueType(), isCpp, settings))
            return true;
        if (isNotEqual(parentdecl, src->valueType(), isCpp, settings))
            return true;
    }
    return false;
}

bool ValueFlow::isLifetimeBorrowed(const Token *tok, const Settings &settings)
{
    if (!tok)
        return true;
    if (tok->str() == ",")
        return true;
    if (!tok->astParent())
        return true;
    const Token* parent = nullptr;
    const ValueType* vt = tok->valueType();
    std::vector<ValueType> vtParents = getParentValueTypes(tok, settings, &parent);
    for (const ValueType& vtParent : vtParents) {
        if (isLifetimeBorrowed(vt, &vtParent))
            return true;
        if (isLifetimeOwned(vt, &vtParent))
            return false;
    }
    if (parent) {
        if (isDifferentType(tok, parent, settings))
            return false;
    }
    return true;
}

static void valueFlowLifetimeFunction(Token *tok, const TokenList &tokenlist, ErrorLogger &errorLogger, const Settings &settings);

static void valueFlowLifetimeConstructor(Token *tok,
                                         const TokenList &tokenlist,
                                         ErrorLogger &errorLogger,
                                         const Settings &settings);

static bool isRangeForScope(const Scope* scope)
{
    if (!scope)
        return false;
    if (scope->type != ScopeType::eFor)
        return false;
    if (!scope->bodyStart)
        return false;
    if (!Token::simpleMatch(scope->bodyStart->previous(), ") {"))
        return false;
    return Token::simpleMatch(scope->bodyStart->linkAt(-1)->astOperand2(), ":");
}

static const Token* getEndOfVarScope(const Variable* var)
{
    if (!var)
        return nullptr;
    const Scope* innerScope = var->scope();
    const Scope* outerScope = innerScope;
    if (var->typeStartToken() && var->typeStartToken()->scope())
        outerScope = var->typeStartToken()->scope();
    if (!innerScope && outerScope)
        innerScope = outerScope;
    if (!innerScope || !outerScope)
        return nullptr;
    if (!innerScope->isExecutable())
        return nullptr;
    // If the variable is defined in a for/while initializer then we want to
    // pick one token after the end so forward analysis can analyze the exit
    // conditions
    if (innerScope != outerScope && outerScope->isExecutable() && innerScope->isLoopScope() &&
        !isRangeForScope(innerScope))
        return innerScope->bodyEnd->next();
    return innerScope->bodyEnd;
}

const Token* ValueFlow::getEndOfExprScope(const Token* tok, const Scope* defaultScope, bool smallest)
{
    const Token* end = nullptr;
    bool local = false;
    visitAstNodes(tok, [&](const Token* child) {
        if (const Variable* var = child->variable()) {
            local |= var->isLocal();
            if (var->isLocal() || var->isArgument()) {
                const Token* varEnd = getEndOfVarScope(var);
                if (!end || (smallest ? precedes(varEnd, end) : succeeds(varEnd, end)))
                    end = varEnd;

                const Token* top = var->nameToken()->astTop();
                if (Token::simpleMatch(top->tokAt(-1), "if (")) { // variable declared in if (...)
                    const Token* elseTok = top->link()->linkAt(1);
                    if (Token::simpleMatch(elseTok, "} else {") && tok->scope()->isNestedIn(elseTok->tokAt(2)->scope()))
                        end = tok->scope()->bodyEnd;
                }
            }
        }
        return ChildrenToVisit::op1_and_op2;
    });
    if (!end && defaultScope)
        end = defaultScope->bodyEnd;
    if (!end) {
        const Scope* scope = tok->scope();
        if (scope)
            end = scope->bodyEnd;
        // If there is no local variables then pick the function scope
        if (!local) {
            while (scope && scope->isLocal())
                scope = scope->nestedIn;
            if (scope && scope->isExecutable())
                end = scope->bodyEnd;
        }
    }
    return end;
}

static void valueFlowForwardLifetime(Token * tok, const TokenList &tokenlist, ErrorLogger &errorLogger, const Settings &settings)
{
    // Forward lifetimes to constructed variable
    if (Token::Match(tok->previous(), "%var% {|(") && isVariableDecl(tok->previous())) {
        std::list<ValueFlow::Value> values = tok->values();
        values.remove_if(&isNotLifetimeValue);
        valueFlowForward(nextAfterAstRightmostLeaf(tok), ValueFlow::getEndOfExprScope(tok), tok->previous(), std::move(values), tokenlist, errorLogger, settings);
        return;
    }
    Token *parent = tok->astParent();
    while (parent && parent->str() == ",")
        parent = parent->astParent();
    if (!parent)
        return;
    // Assignment
    if (parent->str() == "=" && (!parent->astParent() || Token::simpleMatch(parent->astParent(), ";"))) {
        // Rhs values..
        if (!parent->astOperand2() || parent->astOperand2()->values().empty())
            return;

        if (!ValueFlow::isLifetimeBorrowed(parent->astOperand2(), settings))
            return;

        const Token* expr = getLHSVariableToken(parent);
        if (!expr)
            return;

        if (expr->exprId() == 0)
            return;

        const Token* endOfVarScope = ValueFlow::getEndOfExprScope(expr);

        // Only forward lifetime values
        std::list<ValueFlow::Value> values = parent->astOperand2()->values();
        values.remove_if(&isNotLifetimeValue);
        // Dont forward lifetimes that overlap
        values.remove_if([&](const ValueFlow::Value& value) {
            return findAstNode(value.tokvalue, [&](const Token* child) {
                return child->exprId() == expr->exprId();
            });
        });

        // Skip RHS
        Token* nextExpression = nextAfterAstRightmostLeaf(parent);

        if (expr->exprId() > 0) {
            valueFlowForward(nextExpression, endOfVarScope->next(), expr, values, tokenlist, errorLogger, settings);

            for (ValueFlow::Value& val : values) {
                if (val.lifetimeKind == ValueFlow::Value::LifetimeKind::Address)
                    val.lifetimeKind = ValueFlow::Value::LifetimeKind::SubObject;
            }
            // TODO: handle `[`
            if (Token::simpleMatch(parent->astOperand1(), ".")) {
                const Token* parentLifetime =
                    getParentLifetime(parent->astOperand1()->astOperand2(), settings.library);
                if (parentLifetime && parentLifetime->exprId() > 0) {
                    valueFlowForward(nextExpression, endOfVarScope, parentLifetime, std::move(values), tokenlist, errorLogger, settings);
                }
            }
        }
        // Constructor
    } else if (Token::simpleMatch(parent, "{") && !isScopeBracket(parent)) {
        valueFlowLifetimeConstructor(parent, tokenlist, errorLogger, settings);
        valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
        // Function call
    } else if (Token::Match(parent->previous(), "%name% (")) {
        valueFlowLifetimeFunction(parent->previous(), tokenlist, errorLogger, settings);
        valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
        // Variable
    } else if (tok->variable() && tok->variable()->scope()) {
        const Variable *var = tok->variable();
        const Token *endOfVarScope = var->scope()->bodyEnd;

        std::list<ValueFlow::Value> values = tok->values();
        Token *nextExpression = nextAfterAstRightmostLeaf(parent);
        // Only forward lifetime values
        values.remove_if(&isNotLifetimeValue);
        valueFlowForward(nextExpression, endOfVarScope, tok, std::move(values), tokenlist, errorLogger, settings);
        // Cast
    } else if (parent->isCast()) {
        std::list<ValueFlow::Value> values = tok->values();
        // Only forward lifetime values
        values.remove_if(&isNotLifetimeValue);
        for (ValueFlow::Value& value:values)
            setTokenValue(parent, std::move(value), settings);
        valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
    }
}

struct LifetimeStore {
    const Token* argtok{};
    std::string message;
    ValueFlow::Value::LifetimeKind type = ValueFlow::Value::LifetimeKind::Object;
    ErrorPath errorPath;
    bool inconclusive{};
    bool forward = true;

    LifetimeStore() = default;

    LifetimeStore(const Token* argtok,
                  std::string message,
                  ValueFlow::Value::LifetimeKind type = ValueFlow::Value::LifetimeKind::Object,
                  bool inconclusive = false)
        : argtok(argtok),
        message(std::move(message)),
        type(type),
        inconclusive(inconclusive)
    {}

    template<class F>
    static void forEach(const TokenList& tokenlist,
                        ErrorLogger& errorLogger,
                        const Settings& settings,
                        const std::vector<const Token*>& argtoks,
                        const std::string& message,
                        ValueFlow::Value::LifetimeKind type,
                        F f) {
        std::set<Token*> forwardToks;
        for (const Token* arg : argtoks) {
            LifetimeStore ls{arg, message, type};
            ls.forward = false;
            f(ls);
            if (ls.forwardTok)
                forwardToks.emplace(ls.forwardTok);
        }
        for (auto* tok : forwardToks) {
            valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
        }
    }

    static LifetimeStore fromFunctionArg(const Function * f, const Token *tok, const Variable *var, const TokenList &tokenlist, const Settings& settings, ErrorLogger &errorLogger) {
        if (!var)
            return LifetimeStore{};
        if (!var->isArgument())
            return LifetimeStore{};
        const int n = getArgumentPos(var, f);
        if (n < 0)
            return LifetimeStore{};
        std::vector<const Token *> args = getArguments(tok);
        if (n >= args.size()) {
            if (settings.debugwarnings)
                bailout(tokenlist,
                        errorLogger,
                        tok,
                        "Argument mismatch: Function '" + tok->str() + "' returning lifetime from argument index " +
                        std::to_string(n) + " but only " + std::to_string(args.size()) +
                        " arguments are available.");
            return LifetimeStore{};
        }
        const Token *argtok2 = args[n];
        return LifetimeStore{argtok2, "Passed to '" + tok->expressionString() + "'.", ValueFlow::Value::LifetimeKind::Object};
    }

    template<class Predicate>
    bool byRef(Token* tok,
               const TokenList& tokenlist,
               ErrorLogger& errorLogger,
               const Settings& settings,
               const Predicate& pred,
               SourceLocation loc = SourceLocation::current())
    {
        if (!argtok)
            return false;
        bool update = false;
        for (const ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(argtok, settings)) {
            if (!settings.certainty.isEnabled(Certainty::inconclusive) && lt.inconclusive)
                continue;
            if (!lt.token)
                return false;
            if (!pred(lt.token))
                return false;
            ErrorPath er = errorPath;
            er.insert(er.end(), lt.errorPath.cbegin(), lt.errorPath.cend());
            er.emplace_back(argtok, message);

            ValueFlow::Value value;
            value.valueType = ValueFlow::Value::ValueType::LIFETIME;
            value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
            value.tokvalue = lt.token;
            value.errorPath = std::move(er);
            value.lifetimeKind = type;
            value.setInconclusive(lt.inconclusive || inconclusive);
            // Don't add the value a second time
            if (std::find(tok->values().cbegin(), tok->values().cend(), value) != tok->values().cend())
                return false;
            if (settings.debugnormal)
                setSourceLocation(value, loc, tok);
            setTokenValue(tok, std::move(value), settings);
            update = true;
        }
        if (update && forward)
            forwardLifetime(tok, tokenlist, errorLogger, settings);
        return update;
    }

    bool byRef(Token* tok,
               const TokenList& tokenlist,
               ErrorLogger& errorLogger,
               const Settings& settings,
               SourceLocation loc = SourceLocation::current())
    {
        return byRef(
            tok,
            tokenlist,
            errorLogger,
            settings,
            [](const Token*) {
            return true;
        },
            loc);
    }

    template<class Predicate>
    bool byVal(Token* tok,
               const TokenList& tokenlist,
               ErrorLogger& errorLogger,
               const Settings& settings,
               const Predicate& pred,
               SourceLocation loc = SourceLocation::current())
    {
        if (!argtok)
            return false;
        bool update = false;
        if (argtok->values().empty()) {
            ErrorPath er;
            er.emplace_back(argtok, message);
            for (const ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(argtok, settings)) {
                if (!settings.certainty.isEnabled(Certainty::inconclusive) && lt.inconclusive)
                    continue;
                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::LIFETIME;
                value.tokvalue = lt.token;
                value.capturetok = argtok;
                value.errorPath = er;
                value.lifetimeKind = type;
                value.setInconclusive(inconclusive || lt.inconclusive);
                const Variable* var = lt.token->variable();
                if (var && var->isArgument()) {
                    value.lifetimeScope = ValueFlow::Value::LifetimeScope::Argument;
                } else {
                    continue;
                }
                // Don't add the value a second time
                if (std::find(tok->values().cbegin(), tok->values().cend(), value) != tok->values().cend())
                    continue;
                if (settings.debugnormal)
                    setSourceLocation(value, loc, tok);
                setTokenValue(tok, std::move(value), settings);
                update = true;
            }
        }
        for (const ValueFlow::Value &v : argtok->values()) {
            if (!v.isLifetimeValue())
                continue;
            const Token *tok3 = v.tokvalue;
            for (const ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(tok3, settings)) {
                if (!settings.certainty.isEnabled(Certainty::inconclusive) && lt.inconclusive)
                    continue;
                ErrorPath er = v.errorPath;
                er.insert(er.end(), lt.errorPath.cbegin(), lt.errorPath.cend());
                if (!lt.token)
                    return false;
                if (!pred(lt.token))
                    return false;
                er.emplace_back(argtok, message);
                er.insert(er.end(), errorPath.cbegin(), errorPath.cend());

                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::LIFETIME;
                value.lifetimeScope = v.lifetimeScope;
                value.path = v.path;
                value.tokvalue = lt.token;
                value.capturetok = argtok;
                value.errorPath = std::move(er);
                value.lifetimeKind = type;
                value.setInconclusive(lt.inconclusive || v.isInconclusive() || inconclusive);
                // Don't add the value a second time
                if (std::find(tok->values().cbegin(), tok->values().cend(), value) != tok->values().cend())
                    continue;
                if (settings.debugnormal)
                    setSourceLocation(value, loc, tok);
                setTokenValue(tok, std::move(value), settings);
                update = true;
            }
        }
        if (update && forward)
            forwardLifetime(tok, tokenlist, errorLogger, settings);
        return update;
    }

    bool byVal(Token* tok,
               const TokenList& tokenlist,
               ErrorLogger& errorLogger,
               const Settings& settings,
               SourceLocation loc = SourceLocation::current())
    {
        return byVal(
            tok,
            tokenlist,
            errorLogger,
            settings,
            [](const Token*) {
            return true;
        },
            loc);
    }

    template<class Predicate>
    bool byDerefCopy(Token* tok,
                     const TokenList& tokenlist,
                     ErrorLogger& errorLogger,
                     const Settings& settings,
                     Predicate pred,
                     SourceLocation loc = SourceLocation::current()) const
    {
        bool update = false;
        if (!settings.certainty.isEnabled(Certainty::inconclusive) && inconclusive)
            return update;
        if (!argtok)
            return update;
        if (!tok)
            return update;
        for (const ValueFlow::Value &v : argtok->values()) {
            if (!v.isLifetimeValue())
                continue;
            const Token *tok2 = v.tokvalue;
            ErrorPath er = v.errorPath;
            const Variable *var = ValueFlow::getLifetimeVariable(tok2, er, settings);
            // TODO: the inserted data is never used
            er.insert(er.end(), errorPath.cbegin(), errorPath.cend());
            if (!var)
                continue;
            const Token * const varDeclEndToken = var->declEndToken();
            if (!varDeclEndToken)
                continue;
            for (const Token *tok3 = tok; tok3 && tok3 != varDeclEndToken; tok3 = tok3->previous()) {
                if (tok3->varId() == var->declarationId()) {
                    update |= LifetimeStore{tok3, message, type, inconclusive}
                    .byVal(tok, tokenlist, errorLogger, settings, pred, loc);
                    break;
                }
            }
        }
        return update;
    }

    bool byDerefCopy(Token* tok,
                     const TokenList& tokenlist,
                     ErrorLogger& errorLogger,
                     const Settings& settings,
                     SourceLocation loc = SourceLocation::current()) const
    {
        return byDerefCopy(
            tok,
            tokenlist,
            errorLogger,
            settings,
            [](const Token*) {
            return true;
        },
            loc);
    }

private:
    // cppcheck-suppress naming-privateMemberVariable
    Token* forwardTok{};
    void forwardLifetime(Token* tok, const TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings) {
        forwardTok = tok;
        valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
    }
};

static bool hasBorrowingVariables(const std::list<Variable>& vars, const std::vector<const Token*>& args, int depth = 10)
{
    if (depth < 0)
        return true;
    return std::any_of(vars.cbegin(), vars.cend(), [&](const Variable& var) {
        if (const ValueType* vt = var.valueType()) {
            if (vt->pointer > 0 &&
                std::none_of(args.begin(), args.end(), [vt](const Token* arg) {
                return arg->valueType() && arg->valueType()->type == vt->type;
            }))
                return false;
            if (vt->pointer > 0)
                return true;
            if (vt->reference != Reference::None)
                return true;
            if (vt->isPrimitive())
                return false;
            if (vt->isEnum())
                return false;
            // TODO: Check container inner type
            if (vt->type == ValueType::CONTAINER && vt->container)
                return vt->container->view;
            if (vt->typeScope)
                return hasBorrowingVariables(vt->typeScope->varlist, args, depth - 1);
        }
        return true;
    });
}

static void valueFlowLifetimeUserConstructor(Token* tok,
                                             const Function* constructor,
                                             const std::string& name,
                                             const std::vector<const Token*>& args,
                                             const TokenList& tokenlist,
                                             ErrorLogger& errorLogger,
                                             const Settings& settings)
{
    if (!constructor)
        return;
    std::unordered_map<const Token*, const Variable*> argToParam;
    for (std::size_t i = 0; i < args.size(); i++)
        argToParam[args[i]] = constructor->getArgumentVar(i);
    if (const Token* initList = constructor->constructorMemberInitialization()) {
        std::unordered_map<const Variable*, LifetimeCapture> paramCapture;
        for (const Token* tok2 : astFlatten(initList->astOperand2(), ",")) {
            if (!Token::simpleMatch(tok2, "("))
                continue;
            if (!tok2->astOperand1())
                continue;
            if (!tok2->astOperand2())
                continue;
            const Variable* var = tok2->astOperand1()->variable();
            const Token* expr = tok2->astOperand2();
            if (!var)
                continue;
            if (!ValueFlow::isLifetimeBorrowed(expr, settings))
                continue;
            const Variable* argvar = ValueFlow::getLifetimeVariable(expr, settings);
            if (var->isReference() || var->isRValueReference()) {
                if (argvar && argvar->isArgument() && (argvar->isReference() || argvar->isRValueReference())) {
                    paramCapture[argvar] = LifetimeCapture::ByReference;
                }
            } else {
                bool found = false;
                for (const ValueFlow::Value& v : expr->values()) {
                    if (!v.isLifetimeValue())
                        continue;
                    if (v.path > 0)
                        continue;
                    if (!v.tokvalue)
                        continue;
                    const Variable* lifeVar = v.tokvalue->variable();
                    if (!lifeVar)
                        continue;
                    LifetimeCapture c = LifetimeCapture::Undefined;
                    if (!v.isArgumentLifetimeValue() && (lifeVar->isReference() || lifeVar->isRValueReference()))
                        c = LifetimeCapture::ByReference;
                    else if (v.isArgumentLifetimeValue())
                        c = LifetimeCapture::ByValue;
                    if (c != LifetimeCapture::Undefined) {
                        paramCapture[lifeVar] = c;
                        found = true;
                    }
                }
                if (!found && argvar && argvar->isArgument())
                    paramCapture[argvar] = LifetimeCapture::ByValue;
            }
        }
        // TODO: Use SubExpressionAnalyzer for members
        LifetimeStore::forEach(tokenlist,
                               errorLogger,
                               settings,
                               args,
                               "Passed to constructor of '" + name + "'.",
                               ValueFlow::Value::LifetimeKind::SubObject,
                               [&](LifetimeStore& ls) {
            const Variable* paramVar = argToParam.at(ls.argtok);
            if (paramCapture.count(paramVar) == 0)
                return;
            const LifetimeCapture c = paramCapture.at(paramVar);
            if (c == LifetimeCapture::ByReference)
                ls.byRef(tok, tokenlist, errorLogger, settings);
            else
                ls.byVal(tok, tokenlist, errorLogger, settings);
        });
    } else if (hasBorrowingVariables(constructor->nestedIn->varlist, args)) {
        LifetimeStore::forEach(tokenlist,
                               errorLogger,
                               settings,
                               args,
                               "Passed to constructor of '" + name + "'.",
                               ValueFlow::Value::LifetimeKind::SubObject,
                               [&](LifetimeStore& ls) {
            ls.inconclusive = true;
            const Variable* var = argToParam.at(ls.argtok);
            if (var && !var->isConst() && var->isReference())
                ls.byRef(tok, tokenlist, errorLogger, settings);
            else
                ls.byVal(tok, tokenlist, errorLogger, settings);
        });
    }
}

static void valueFlowLifetimeFunction(Token *tok, const TokenList &tokenlist, ErrorLogger &errorLogger, const Settings &settings)
{
    if (!Token::Match(tok, "%name% ("))
        return;
    Token* memtok = nullptr;
    if (Token::Match(tok->astParent(), ". %name% (") && astIsRHS(tok))
        memtok = tok->astParent()->astOperand1();
    const int returnContainer = settings.library.returnValueContainer(tok);
    if (returnContainer >= 0) {
        std::vector<const Token *> args = getArguments(tok);
        for (int argnr = 1; argnr <= args.size(); ++argnr) {
            const Library::ArgumentChecks::IteratorInfo *i = settings.library.getArgIteratorInfo(tok, argnr);
            if (!i)
                continue;
            if (i->container != returnContainer)
                continue;
            const Token * const argTok = args[argnr - 1];
            bool forward = false;
            for (ValueFlow::Value val : argTok->values()) {
                if (!val.isLifetimeValue())
                    continue;
                val.errorPath.emplace_back(argTok, "Passed to '" + tok->str() + "'.");
                setTokenValue(tok->next(), std::move(val), settings);
                forward = true;
            }
            // Check if lifetime is available to avoid adding the lifetime twice
            if (forward) {
                valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
                break;
            }
        }
    } else if (Token::Match(tok->tokAt(-2), "std :: ref|cref|tie|front_inserter|back_inserter")) {
        for (const Token *argtok : getArguments(tok)) {
            LifetimeStore{argtok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Object}.byRef(
                tok->next(), tokenlist, errorLogger, settings);
        }
    } else if (Token::Match(tok->tokAt(-2), "std :: make_tuple|tuple_cat|make_pair|make_reverse_iterator|next|prev|move|bind")) {
        for (const Token *argtok : getArguments(tok)) {
            LifetimeStore{argtok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Object}.byVal(
                tok->next(), tokenlist, errorLogger, settings);
        }
    } else if (memtok && Token::Match(tok->astParent(), ". push_back|push_front|insert|push|assign") &&
               astIsNonStringContainer(memtok)) {
        std::vector<const Token *> args = getArguments(tok);
        const std::size_t n = args.size();
        if (n > 1 && Token::typeStr(args[n - 2]) == Token::typeStr(args[n - 1]) &&
            (((astIsIterator(args[n - 2]) && astIsIterator(args[n - 1])) ||
              (astIsPointer(args[n - 2]) && astIsPointer(args[n - 1]))))) {
            LifetimeStore{
                args.back(), "Added to container '" + memtok->str() + "'.", ValueFlow::Value::LifetimeKind::Object}
            .byDerefCopy(memtok, tokenlist, errorLogger, settings);
        } else if (!args.empty() && ValueFlow::isLifetimeBorrowed(args.back(), settings)) {
            LifetimeStore{
                args.back(), "Added to container '" + memtok->str() + "'.", ValueFlow::Value::LifetimeKind::Object}
            .byVal(memtok, tokenlist, errorLogger, settings);
        }
    } else if (tok->function()) {
        const Function *f = tok->function();
        if (f->isConstructor()) {
            valueFlowLifetimeUserConstructor(tok->next(), f, tok->str(), getArguments(tok), tokenlist, errorLogger, settings);
            return;
        }
        if (Function::returnsReference(f))
            return;
        std::vector<const Token*> returns = Function::findReturns(f);
        const bool inconclusive = returns.size() > 1;
        bool update = false;
        for (const Token* returnTok : returns) {
            if (returnTok == tok)
                continue;
            const Variable *returnVar = ValueFlow::getLifetimeVariable(returnTok, settings);
            if (returnVar && returnVar->isArgument() && (returnVar->isConst() || !isVariableChanged(returnVar, settings))) {
                LifetimeStore ls = LifetimeStore::fromFunctionArg(f, tok, returnVar, tokenlist, settings, errorLogger);
                ls.inconclusive = inconclusive;
                ls.forward = false;
                update |= ls.byVal(tok->next(), tokenlist, errorLogger, settings);
            }
            for (const ValueFlow::Value &v : returnTok->values()) {
                if (!v.isLifetimeValue())
                    continue;
                if (!v.tokvalue)
                    continue;
                if (memtok &&
                    (contains({ValueFlow::Value::LifetimeScope::ThisPointer, ValueFlow::Value::LifetimeScope::ThisValue},
                              v.lifetimeScope) ||
                     exprDependsOnThis(v.tokvalue))) {
                    LifetimeStore ls = LifetimeStore{memtok,
                                                     "Passed to member function '" + tok->expressionString() + "'.",
                                                     ValueFlow::Value::LifetimeKind::Object};
                    ls.inconclusive = inconclusive;
                    ls.forward = false;
                    ls.errorPath = v.errorPath;
                    ls.errorPath.emplace_front(returnTok, "Return " + lifetimeType(returnTok, &v) + ".");
                    int thisIndirect = v.lifetimeScope == ValueFlow::Value::LifetimeScope::ThisValue ? 0 : 1;
                    if (derefShared(memtok->astParent()))
                        thisIndirect--;
                    if (thisIndirect == -1)
                        update |= ls.byDerefCopy(tok->next(), tokenlist, errorLogger, settings);
                    else if (thisIndirect == 0)
                        update |= ls.byVal(tok->next(), tokenlist, errorLogger, settings);
                    else if (thisIndirect == 1)
                        update |= ls.byRef(tok->next(), tokenlist, errorLogger, settings);
                    continue;
                }
                const Variable *var = v.tokvalue->variable();
                LifetimeStore ls = LifetimeStore::fromFunctionArg(f, tok, var, tokenlist, settings, errorLogger);
                if (!ls.argtok)
                    continue;
                ls.forward = false;
                ls.inconclusive = inconclusive;
                ls.errorPath = v.errorPath;
                ls.errorPath.emplace_front(returnTok, "Return " + lifetimeType(returnTok, &v) + ".");
                if (!v.isArgumentLifetimeValue() && (var->isReference() || var->isRValueReference())) {
                    update |= ls.byRef(tok->next(), tokenlist, errorLogger, settings);
                } else if (v.isArgumentLifetimeValue()) {
                    update |= ls.byVal(tok->next(), tokenlist, errorLogger, settings);
                }
            }
        }
        if (update)
            valueFlowForwardLifetime(tok->next(), tokenlist, errorLogger, settings);
    } else if (tok->valueType()) {
        // TODO: Propagate lifetimes with library functions
        if (settings.library.getFunction(tok->previous()))
            return;
        if (Token::simpleMatch(tok->astParent(), "."))
            return;
        // Assume constructing the valueType
        valueFlowLifetimeConstructor(tok->next(), tokenlist, errorLogger, settings);
        valueFlowForwardLifetime(tok->next(), tokenlist, errorLogger, settings);
    } else {
        const std::string& retVal = settings.library.returnValue(tok);
        if (startsWith(retVal, "arg")) {
            std::size_t iArg{};
            try {
                iArg = strToInt<std::size_t>(retVal.substr(3));
            } catch (...) {
                return;
            }
            std::vector<const Token*> args = getArguments(tok);
            if (iArg > 0 && iArg <= args.size()) {
                const Token* varTok = args[iArg - 1];
                if (varTok->variable() && varTok->variable()->isLocal())
                    LifetimeStore{ varTok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Address }.byRef(
                        tok->next(), tokenlist, errorLogger, settings);
            }
        }
    }
}

static bool isScope(const Token* tok)
{
    if (!tok)
        return false;
    if (!Token::simpleMatch(tok, "{"))
        return false;
    const Scope* scope = tok->scope();
    if (!scope)
        return false;
    if (!scope->bodyStart)
        return false;
    return scope->bodyStart == tok;
}

static const Function* findConstructor(const Scope* scope, const Token* tok, const std::vector<const Token*>& args)
{
    if (!tok)
        return nullptr;
    const Function* f = tok->function();
    if (!f && tok->astOperand1())
        f = tok->astOperand1()->function();
    // Search for a constructor
    if (!f || !f->isConstructor()) {
        f = nullptr;
        std::vector<const Function*> candidates;
        for (const Function& function : scope->functionList) {
            if (function.minArgCount() > args.size())
                continue;
            if (!function.isConstructor())
                continue;
            candidates.push_back(&function);
        }
        // TODO: Narrow the candidates
        if (candidates.size() == 1)
            f = candidates.front();
    }
    if (!f)
        return nullptr;
    return f;
}

static void valueFlowLifetimeClassConstructor(Token* tok,
                                              const Type* t,
                                              const TokenList& tokenlist,
                                              ErrorLogger& errorLogger,
                                              const Settings& settings)
{
    if (!Token::Match(tok, "(|{"))
        return;
    if (isScope(tok))
        return;
    if (!t) {
        if (tok->valueType() && tok->valueType()->type != ValueType::RECORD)
            return;
        if (tok->str() != "{" && !Token::Match(tok->previous(), "%var% (") && !isVariableDecl(tok->previous()))
            return;
        // If the type is unknown then assume it captures by value in the
        // constructor, but make each lifetime inconclusive
        std::vector<const Token*> args = getArguments(tok);
        LifetimeStore::forEach(tokenlist,
                               errorLogger,
                               settings,
                               args,
                               "Passed to initializer list.",
                               ValueFlow::Value::LifetimeKind::SubObject,
                               [&](LifetimeStore& ls) {
            ls.inconclusive = true;
            ls.byVal(tok, tokenlist, errorLogger, settings);
        });
        return;
    }
    const Scope* scope = t->classScope;
    if (!scope)
        return;
    // Aggregate constructor
    if (t->derivedFrom.empty() && (t->isClassType() || t->isStructType())) {
        std::vector<const Token*> args = getArguments(tok);
        if (scope->numConstructors == 0) {
            auto it = scope->varlist.cbegin();
            LifetimeStore::forEach(
                tokenlist,
                errorLogger,
                settings,
                args,
                "Passed to constructor of '" + t->name() + "'.",
                ValueFlow::Value::LifetimeKind::SubObject,
                [&](LifetimeStore& ls) {
                // Skip static variable
                it = std::find_if(it, scope->varlist.cend(), [](const Variable& var) {
                    return !var.isStatic();
                });
                if (it == scope->varlist.cend())
                    return;
                const Variable& var = *it;
                if (var.valueType() && var.valueType()->container && var.valueType()->container->stdStringLike && !var.valueType()->container->view)
                    return; // TODO: check in isLifetimeBorrowed()?
                if (var.isReference() || var.isRValueReference()) {
                    ls.byRef(tok, tokenlist, errorLogger, settings);
                } else if (ValueFlow::isLifetimeBorrowed(ls.argtok, settings)) {
                    ls.byVal(tok, tokenlist, errorLogger, settings);
                }
                it++;
            });
        } else {
            const Function* constructor = findConstructor(scope, tok, args);
            valueFlowLifetimeUserConstructor(tok, constructor, t->name(), args, tokenlist, errorLogger, settings);
        }
    }
}

static void valueFlowLifetimeConstructor(Token* tok, const TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings)
{
    if (!Token::Match(tok, "(|{"))
        return;
    if (isScope(tok))
        return;
    std::vector<ValueType> vts;
    if (tok->valueType()) {
        vts = {*tok->valueType()};
    } else if (Token::Match(tok->previous(), "%var% {|(") && isVariableDecl(tok->previous()) &&
               tok->previous()->valueType()) {
        vts = {*tok->previous()->valueType()};
    } else if (Token::simpleMatch(tok, "{") && !Token::Match(tok->previous(), "%name%")) {
        vts = getParentValueTypes(tok, settings);
    }

    for (const ValueType& vt : vts) {
        if (vt.pointer > 0) {
            std::vector<const Token*> args = getArguments(tok);
            LifetimeStore::forEach(tokenlist,
                                   errorLogger,
                                   settings,
                                   args,
                                   "Passed to initializer list.",
                                   ValueFlow::Value::LifetimeKind::SubObject,
                                   [&](LifetimeStore& ls) {
                ls.byVal(tok, tokenlist, errorLogger, settings);
            });
        } else if (vt.container && vt.type == ValueType::CONTAINER) {
            std::vector<const Token*> args = getArguments(tok);
            if (args.size() == 1 && vt.container->view && astIsContainerOwned(args.front())) {
                LifetimeStore{args.front(), "Passed to container view.", ValueFlow::Value::LifetimeKind::SubObject}
                .byRef(tok, tokenlist, errorLogger, settings);
            } else if (args.size() == 2 && (astIsIterator(args[0]) || astIsIterator(args[1]))) {
                LifetimeStore::forEach(
                    tokenlist,
                    errorLogger,
                    settings,
                    args,
                    "Passed to initializer list.",
                    ValueFlow::Value::LifetimeKind::SubObject,
                    [&](const LifetimeStore& ls) {
                    ls.byDerefCopy(tok, tokenlist, errorLogger, settings);
                });
            } else if (vt.container->hasInitializerListConstructor) {
                LifetimeStore::forEach(tokenlist,
                                       errorLogger,
                                       settings,
                                       args,
                                       "Passed to initializer list.",
                                       ValueFlow::Value::LifetimeKind::SubObject,
                                       [&](LifetimeStore& ls) {
                    ls.byVal(tok, tokenlist, errorLogger, settings);
                });
            }
        } else {
            const Type* t = nullptr;
            if (vt.typeScope && vt.typeScope->definedType)
                t = vt.typeScope->definedType;
            else
                t = Token::typeOf(tok->previous());
            valueFlowLifetimeClassConstructor(tok, t, tokenlist, errorLogger, settings);
        }
    }
}

struct Lambda {
    explicit Lambda(const Token* tok)
    {
        if (!Token::simpleMatch(tok, "[") || !tok->link())
            return;
        capture = tok;

        if (Token::simpleMatch(capture->link(), "] (")) {
            arguments = capture->link()->next();
        }
        const Token * afterArguments = arguments ? arguments->link()->next() : capture->link()->next();
        if (afterArguments && afterArguments->originalName() == "->") {
            returnTok = afterArguments->next();
            bodyTok = Token::findsimplematch(returnTok, "{");
        } else if (Token::simpleMatch(afterArguments, "{")) {
            bodyTok = afterArguments;
        }
        for (const Token* c:getCaptures()) {
            if (Token::Match(c, "this !!.")) {
                explicitCaptures[c->variable()] = std::make_pair(c, LifetimeCapture::ByReference);
            } else if (Token::simpleMatch(c, "* this")) {
                explicitCaptures[c->next()->variable()] = std::make_pair(c->next(), LifetimeCapture::ByValue);
            } else if (c->variable()) {
                explicitCaptures[c->variable()] = std::make_pair(c, LifetimeCapture::ByValue);
            } else if (c->isUnaryOp("&") && Token::Match(c->astOperand1(), "%var%")) {
                explicitCaptures[c->astOperand1()->variable()] =
                    std::make_pair(c->astOperand1(), LifetimeCapture::ByReference);
            } else {
                const std::string& s = c->expressionString();
                if (s == "=")
                    implicitCapture = LifetimeCapture::ByValue;
                else if (s == "&")
                    implicitCapture = LifetimeCapture::ByReference;
            }
        }
    }

    const Token* capture{};
    const Token* arguments{};
    const Token* returnTok{};
    const Token* bodyTok{};
    std::unordered_map<const Variable*, std::pair<const Token*, LifetimeCapture>> explicitCaptures;
    LifetimeCapture implicitCapture = LifetimeCapture::Undefined;

    std::vector<const Token*> getCaptures() const {
        return getArguments(capture);
    }

    bool isLambda() const {
        return capture && bodyTok;
    }
};

static bool isDecayedPointer(const Token *tok)
{
    if (!tok)
        return false;
    if (!tok->astParent())
        return false;
    if (Token::simpleMatch(tok->astParent(), "=") && astIsRHS(tok))
        return true;
    if (astIsPointer(tok->astParent()) && !Token::simpleMatch(tok->astParent(), "return"))
        return true;
    if (tok->astParent()->isConstOp())
        return true;
    if (!Token::simpleMatch(tok->astParent(), "return"))
        return false;
    return astIsPointer(tok->astParent()) || astIsContainerView(tok->astParent());
}

static bool isConvertedToView(const Token* tok, const Settings& settings)
{
    std::vector<ValueType> vtParents = getParentValueTypes(tok, settings);
    return std::any_of(vtParents.cbegin(), vtParents.cend(), [&](const ValueType& vt) {
        if (!vt.container)
            return false;
        return vt.container->view;
    });
}

static bool isContainerOfPointers(const Token* tok, const Settings& settings)
{
    if (!tok)
    {
        return true;
    }

    ValueType vt = ValueType::parseDecl(tok, settings);
    return vt.pointer > 0;
}

static void valueFlowLifetime(TokenList &tokenlist, ErrorLogger &errorLogger, const Settings &settings)
{
    for (Token *tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->scope())
            continue;
        if (tok->scope()->type == ScopeType::eGlobal)
            continue;
        Lambda lam(tok);
        // Lambdas
        if (lam.isLambda()) {
            const Scope * bodyScope = lam.bodyTok->scope();

            std::set<const Scope *> scopes;
            // Avoid capturing a variable twice
            std::set<nonneg int> varids;
            bool capturedThis = false;

            auto isImplicitCapturingVariable = [&](const Token *varTok) {
                const Variable *var = varTok->variable();
                if (!var)
                    return false;
                if (varids.count(var->declarationId()) > 0)
                    return false;
                if (!var->isLocal() && !var->isArgument())
                    return false;
                const Scope *scope = var->scope();
                if (!scope)
                    return false;
                if (scopes.count(scope) > 0)
                    return false;
                if (scope->isNestedIn(bodyScope))
                    return false;
                scopes.insert(scope);
                varids.insert(var->declarationId());
                return true;
            };

            bool update = false;
            auto captureVariable = [&](const Token* tok2, LifetimeCapture c, const std::function<bool(const Token*)> &pred) {
                if (varids.count(tok->varId()) > 0)
                    return;
                if (c == LifetimeCapture::ByReference) {
                    LifetimeStore ls{
                        tok2, "Lambda captures variable by reference here.", ValueFlow::Value::LifetimeKind::Lambda};
                    ls.forward = false;
                    update |= ls.byRef(tok, tokenlist, errorLogger, settings, pred);
                } else if (c == LifetimeCapture::ByValue) {
                    LifetimeStore ls{
                        tok2, "Lambda captures variable by value here.", ValueFlow::Value::LifetimeKind::Lambda};
                    ls.forward = false;
                    update |= ls.byVal(tok, tokenlist, errorLogger, settings, pred);
                    pred(tok2);
                }
            };

            auto captureThisVariable = [&](const Token* tok2, LifetimeCapture c) {
                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::LIFETIME;
                if (c == LifetimeCapture::ByReference)
                    value.lifetimeScope = ValueFlow::Value::LifetimeScope::ThisPointer;
                else if (c == LifetimeCapture::ByValue)
                    value.lifetimeScope = ValueFlow::Value::LifetimeScope::ThisValue;
                value.tokvalue = tok2;
                value.errorPath.emplace_back(tok2, "Lambda captures the 'this' variable here.");
                value.lifetimeKind = ValueFlow::Value::LifetimeKind::Lambda;
                capturedThis = true;
                // Don't add the value a second time
                if (std::find(tok->values().cbegin(), tok->values().cend(), value) != tok->values().cend())
                    return;
                setTokenValue(tok, std::move(value), settings);
                update |= true;
            };

            // Handle explicit capture
            for (const auto& p:lam.explicitCaptures) {
                const Variable* var = p.first;
                const Token* tok2 = p.second.first;
                const LifetimeCapture c = p.second.second;
                if (Token::Match(tok2, "this !!.")) {
                    captureThisVariable(tok2, c);
                } else if (var) {
                    captureVariable(tok2, c, [](const Token*) {
                        return true;
                    });
                    varids.insert(var->declarationId());
                }
            }

            auto isImplicitCapturingThis = [&](const Token* tok2) {
                if (capturedThis)
                    return false;
                if (Token::simpleMatch(tok2, "this"))
                    return true;
                if (tok2->variable()) {
                    if (Token::simpleMatch(tok2->previous(), "."))
                        return false;
                    const Variable* var = tok2->variable();
                    if (var->isLocal())
                        return false;
                    if (var->isArgument())
                        return false;
                    return exprDependsOnThis(tok2);
                }
                if (Token::simpleMatch(tok2, "("))
                    return exprDependsOnThis(tok2);
                return false;
            };

            for (const Token * tok2 = lam.bodyTok; tok2 != lam.bodyTok->link(); tok2 = tok2->next()) {
                if (isImplicitCapturingThis(tok2)) {
                    captureThisVariable(tok2, LifetimeCapture::ByReference);
                } else if (tok2->variable()) {
                    captureVariable(tok2, lam.implicitCapture, isImplicitCapturingVariable);
                }
            }
            if (update)
                valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
        }
        // address of
        else if (tok->isUnaryOp("&")) {
            if (Token::simpleMatch(tok->astParent(), "*"))
                continue;
            for (const ValueFlow::LifetimeToken& lt : ValueFlow::getLifetimeTokens(tok->astOperand1(), settings)) {
                if (!settings.certainty.isEnabled(Certainty::inconclusive) && lt.inconclusive)
                    continue;
                ErrorPath errorPath = lt.errorPath;
                errorPath.emplace_back(tok, "Address of variable taken here.");

                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::LIFETIME;
                value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
                value.tokvalue = lt.token;
                value.errorPath = std::move(errorPath);
                if (lt.addressOf || astIsPointer(lt.token) || !Token::Match(lt.token->astParent(), ".|["))
                    value.lifetimeKind = ValueFlow::Value::LifetimeKind::Address;
                value.setInconclusive(lt.inconclusive);
                setTokenValue(tok, std::move(value), settings);

                valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
            }
        }
        // Converting to container view
        else if (astIsContainerOwned(tok) && isConvertedToView(tok, settings)) {
            LifetimeStore ls =
                LifetimeStore{tok, "Converted to container view", ValueFlow::Value::LifetimeKind::SubObject};
            ls.byRef(tok, tokenlist, errorLogger, settings);
            valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
        }
        // container lifetimes
        else if (astIsContainer(tok)) {
            Token * parent = astParentSkipParens(tok);
            if (!parent)
                continue;
            if (!Token::Match(parent, ". %name% (") && !Token::Match(parent->previous(), "%name% ("))
                continue;

            // Skip if its a free function that doesnt yield an iterator to the container
            if (Token::Match(parent->previous(), "%name% (") &&
                !contains({Library::Container::Yield::START_ITERATOR, Library::Container::Yield::END_ITERATOR},
                          astFunctionYield(parent->previous(), settings)))
                continue;

            ValueFlow::Value master;
            master.valueType = ValueFlow::Value::ValueType::LIFETIME;
            master.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;

            if (astIsIterator(parent->tokAt(2))) {
                master.errorPath.emplace_back(parent->tokAt(2), "Iterator to container is created here.");
                master.lifetimeKind = ValueFlow::Value::LifetimeKind::Iterator;
            } else if (astIsIterator(parent) && Token::Match(parent->previous(), "%name% (") &&
                       contains({Library::Container::Yield::START_ITERATOR, Library::Container::Yield::END_ITERATOR},
                                astFunctionYield(parent->previous(), settings))) {
                master.errorPath.emplace_back(parent, "Iterator to container is created here.");
                master.lifetimeKind = ValueFlow::Value::LifetimeKind::Iterator;
            } else if ((astIsPointer(parent->tokAt(2)) &&
                        !isContainerOfPointers(tok->valueType()->containerTypeToken, settings)) ||
                       Token::Match(parent->next(), "data|c_str")) {
                master.errorPath.emplace_back(parent->tokAt(2), "Pointer to container is created here.");
                master.lifetimeKind = ValueFlow::Value::LifetimeKind::Object;
            } else {
                continue;
            }

            std::vector<const Token*> toks;
            if (tok->isUnaryOp("*") || parent->originalName() == "->") {
                for (const ValueFlow::Value& v : tok->values()) {
                    if (!v.isLocalLifetimeValue())
                        continue;
                    if (v.lifetimeKind != ValueFlow::Value::LifetimeKind::Address)
                        continue;
                    if (!v.tokvalue)
                        continue;
                    toks.push_back(v.tokvalue);
                }
            } else if (astIsContainerView(tok)) {
                for (const ValueFlow::Value& v : tok->values()) {
                    if (!v.isLocalLifetimeValue())
                        continue;
                    if (!v.tokvalue)
                        continue;
                    if (!astIsContainerOwned(v.tokvalue))
                        continue;
                    toks.push_back(v.tokvalue);
                }
            } else {
                toks = {tok};
            }

            for (const Token* tok2 : toks) {
                for (const ReferenceToken& rt : followAllReferences(tok2, false)) {
                    ValueFlow::Value value = master;
                    value.tokvalue = rt.token;
                    value.errorPath.insert(value.errorPath.begin(), rt.errors.cbegin(), rt.errors.cend());
                    if (Token::simpleMatch(parent, "("))
                        setTokenValue(parent, std::move(value), settings);
                    else
                        setTokenValue(parent->tokAt(2), std::move(value), settings);

                    if (!rt.token->variable()) {
                        LifetimeStore ls = LifetimeStore{
                            rt.token, master.errorPath.back().second, ValueFlow::Value::LifetimeKind::Object};
                        ls.byRef(parent->tokAt(2), tokenlist, errorLogger, settings);
                    }
                }
            }
            valueFlowForwardLifetime(parent->tokAt(2), tokenlist, errorLogger, settings);
        }
        // Check constructors
        else if (Token::Match(tok, "=|return|%name%|{|,|> {") && !isScope(tok->next())) {
            valueFlowLifetimeConstructor(tok->next(), tokenlist, errorLogger, settings);
        }
        // Check function calls
        else if (Token::Match(tok, "%name% (") && !Token::simpleMatch(tok->linkAt(1), ") {")) {
            valueFlowLifetimeFunction(tok, tokenlist, errorLogger, settings);
        }
        // Unique pointer lifetimes
        else if (astIsUniqueSmartPointer(tok) && astIsLHS(tok) && Token::simpleMatch(tok->astParent(), ". get ( )")) {
            Token* ptok = tok->astParent()->tokAt(2);
            ErrorPath errorPath = {{ptok, "Raw pointer to smart pointer created here."}};
            ValueFlow::Value value;
            value.valueType = ValueFlow::Value::ValueType::LIFETIME;
            value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
            value.lifetimeKind = ValueFlow::Value::LifetimeKind::SubObject;
            value.tokvalue = tok;
            value.errorPath = std::move(errorPath);
            setTokenValue(ptok, std::move(value), settings);
            valueFlowForwardLifetime(ptok, tokenlist, errorLogger, settings);
        }
        // Check variables
        else if (tok->variable()) {
            ErrorPath errorPath;
            const Variable * var = ValueFlow::getLifetimeVariable(tok, errorPath, settings);
            if (!var)
                continue;
            if (var->nameToken() == tok)
                continue;
            if (var->isArray() && !var->isStlType() && !var->isArgument() && isDecayedPointer(tok)) {
                errorPath.emplace_back(tok, "Array decayed to pointer here.");

                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::LIFETIME;
                value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
                value.tokvalue = var->nameToken();
                value.errorPath = std::move(errorPath);
                setTokenValue(tok, std::move(value), settings);

                valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
            }
        }
        // Forward any lifetimes
        else if (std::any_of(tok->values().cbegin(), tok->values().cend(), std::mem_fn(&ValueFlow::Value::isLifetimeValue))) {
            valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
        }
    }
}

static bool isStdMoveOrStdForwarded(Token * tok, ValueFlow::Value::MoveKind * moveKind, Token ** varTok = nullptr)
{
    if (tok->str() != "std")
        return false;
    ValueFlow::Value::MoveKind kind = ValueFlow::Value::MoveKind::NonMovedVariable;
    Token * variableToken = nullptr;
    if (Token::Match(tok, "std :: move ( %var% )")) {
        variableToken = tok->tokAt(4);
        kind = ValueFlow::Value::MoveKind::MovedVariable;
    } else if (Token::simpleMatch(tok, "std :: forward <")) {
        Token * const leftAngle = tok->tokAt(3);
        Token * rightAngle = leftAngle->link();
        if (Token::Match(rightAngle, "> ( %var% )")) {
            variableToken = rightAngle->tokAt(2);
            kind = ValueFlow::Value::MoveKind::ForwardedVariable;
        }
    }
    if (!variableToken)
        return false;
    if (variableToken->strAt(2) == ".") // Only partially moved
        return false;
    if (variableToken->valueType() && variableToken->valueType()->type >= ValueType::Type::VOID)
        return false;
    if (moveKind != nullptr)
        *moveKind = kind;
    if (varTok != nullptr)
        *varTok = variableToken;
    return true;
}

static bool isOpenParenthesisMemberFunctionCallOfVarId(const Token * openParenthesisToken, nonneg int varId)
{
    const Token * varTok = openParenthesisToken->tokAt(-3);
    return Token::Match(varTok, "%varid% . %name% (", varId) &&
           varTok->next()->originalName().empty();
}

static Token* findOpenParentesisOfMove(Token* moveVarTok)
{
    Token* tok = moveVarTok;
    while (tok && tok->str() != "(")
        tok = tok->previous();
    return tok;
}

static Token* findEndOfFunctionCallForParameter(Token* parameterToken)
{
    if (!parameterToken)
        return nullptr;
    Token* parent = parameterToken->astParent();
    while (parent && !parent->isOp() && !Token::Match(parent, "[({]"))
        parent = parent->astParent();
    if (!parent)
        return nullptr;
    return nextAfterAstRightmostLeaf(parent);
}

static void valueFlowAfterMove(const TokenList& tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger& errorLogger, const Settings& settings)
{
    if (!tokenlist.isCPP() || settings.standards.cpp < Standards::CPP11)
        return;
    for (const Scope * scope : symboldatabase.functionScopes) {
        if (!scope)
            continue;
        const Token * start = scope->bodyStart;
        if (scope->function) {
            const Token * memberInitializationTok = scope->function->constructorMemberInitialization();
            if (memberInitializationTok)
                start = memberInitializationTok;
        }

        for (auto* tok = const_cast<Token*>(start); tok != scope->bodyEnd; tok = tok->next()) {
            Token * varTok;
            if (Token::Match(tok, "%var% . reset|clear (") && tok->next()->originalName().empty()) {
                varTok = tok;

                const Variable *var = tok->variable();
                if (!var || (!var->isLocal() && !var->isArgument()))
                    continue;

                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::MOVED;
                value.moveKind = ValueFlow::Value::MoveKind::NonMovedVariable;
                value.errorPath.emplace_back(tok, "Calling " + tok->next()->expressionString() + " makes " + tok->str() + " 'non-moved'");
                value.setKnown();

                setTokenValue(tok, value, settings);
                if (var->scope()) {
                    const Token* const endOfVarScope = var->scope()->bodyEnd;
                    valueFlowForward(tok->next(), endOfVarScope, tok, std::move(value), tokenlist, errorLogger, settings);
                }
                continue;
            }
            ValueFlow::Value::MoveKind moveKind;
            if (!isStdMoveOrStdForwarded(tok, &moveKind, &varTok))
                continue;
            const nonneg int varId = varTok->varId();
            // x is not MOVED after assignment if code is:  x = ... std::move(x) .. ;
            const Token *parent = tok->astParent();
            while (parent && parent->str() != "=" && parent->str() != "return" &&
                   !(parent->str() == "(" && isOpenParenthesisMemberFunctionCallOfVarId(parent, varId)))
                parent = parent->astParent();
            if (parent &&
                (parent->str() == "return" || // MOVED in return statement
                 parent->str() == "(")) // MOVED in self assignment, isOpenParenthesisMemberFunctionCallOfVarId == true
                continue;
            if (parent && parent->astOperand1() && parent->astOperand1()->varId() == varId)
                continue;
            const Token* const endOfVarScope = ValueFlow::getEndOfExprScope(varTok);

            Token* openParentesisOfMove = findOpenParentesisOfMove(varTok);
            Token* endOfFunctionCall = findEndOfFunctionCallForParameter(openParentesisOfMove);
            if (endOfFunctionCall) {
                if (endOfFunctionCall->str() == ")") {
                    Token* ternaryColon = endOfFunctionCall->link()->astParent();
                    while (Token::simpleMatch(ternaryColon, "("))
                        ternaryColon = ternaryColon->astParent();
                    if (Token::simpleMatch(ternaryColon, ":")) {
                        endOfFunctionCall = ternaryColon->astOperand2();
                        if (Token::simpleMatch(endOfFunctionCall, "("))
                            endOfFunctionCall = endOfFunctionCall->link();
                    }
                }
                ValueFlow::Value value;
                value.valueType = ValueFlow::Value::ValueType::MOVED;
                value.moveKind = moveKind;
                if (moveKind == ValueFlow::Value::MoveKind::MovedVariable)
                    value.errorPath.emplace_back(tok, "Calling std::move(" + varTok->str() + ")");
                else // if (moveKind == ValueFlow::Value::ForwardedVariable)
                    value.errorPath.emplace_back(tok, "Calling std::forward(" + varTok->str() + ")");
                value.setKnown();

                valueFlowForward(endOfFunctionCall, endOfVarScope, varTok, std::move(value), tokenlist, errorLogger, settings);
            }
        }
    }
}

static const Token* findIncompleteVar(const Token* start, const Token* end)
{
    for (const Token* tok = start; tok != end; tok = tok->next()) {
        if (tok->isIncompleteVar())
            return tok;
    }
    return nullptr;
}

static ValueFlow::Value makeConditionValue(long long val,
                                           const Token* condTok,
                                           bool assume,
                                           bool impossible,
                                           const Settings& settings,
                                           SourceLocation loc = SourceLocation::current())
{
    ValueFlow::Value v(val);
    v.setKnown();
    if (impossible) {
        v.intvalue = !v.intvalue;
        v.setImpossible();
    }
    v.condition = condTok;
    if (assume)
        v.errorPath.emplace_back(condTok, "Assuming condition '" + condTok->expressionString() + "' is true");
    else
        v.errorPath.emplace_back(condTok, "Assuming condition '" + condTok->expressionString() + "' is false");
    if (settings.debugnormal)
        setSourceLocation(v, loc, condTok);
    return v;
}

static std::vector<const Token*> getConditions(const Token* tok, const char* op)
{
    std::vector<const Token*> conds = {tok};
    if (tok->str() == op) {
        std::vector<const Token*> args = astFlatten(tok, op);
        std::copy_if(args.cbegin(), args.cend(), std::back_inserter(conds), [&](const Token* tok2) {
            if (tok2->exprId() == 0)
                return false;
            if (tok2->hasKnownIntValue())
                return false;
            if (Token::Match(tok2, "%var%|.") && !astIsBool(tok2))
                return false;
            return true;
        });
    }
    return conds;
}

static bool isBreakOrContinueScope(const Token* endToken)
{
    if (!Token::simpleMatch(endToken, "}"))
        return false;
    return Token::Match(endToken->tokAt(-2), "break|continue ;");
}

static const Scope* getLoopScope(const Token* tok)
{
    if (!tok)
        return nullptr;
    const Scope* scope = tok->scope();
    while (scope && scope->type != ScopeType::eWhile && scope->type != ScopeType::eFor && scope->type != ScopeType::eDo)
        scope = scope->nestedIn;
    return scope;
}

//
static void valueFlowConditionExpressions(const TokenList& tokenlist,
                                          const SymbolDatabase& symboldatabase,
                                          ErrorLogger& errorLogger,
                                          const Settings& settings)
{
    if (!settings.daca && !settings.vfOptions.doConditionExpressionAnalysis) {
        if (settings.debugwarnings) {
            ErrorMessage::FileLocation loc(tokenlist.getSourceFilePath(), 0, 0);
            const ErrorMessage errmsg(
                {std::move(loc)},
                tokenlist.getSourceFilePath(),
                Severity::debug,
                "Analysis of condition expressions is disabled. Use --check-level=exhaustive to enable it.",
                "normalCheckLevelConditionExpressions",
                Certainty::normal);
            errorLogger.reportErr(errmsg);
        }
        return;
    }

    for (const Scope* scope : symboldatabase.functionScopes) {
        if (const Token* incompleteTok = findIncompleteVar(scope->bodyStart, scope->bodyEnd)) {
            if (settings.debugwarnings)
                bailoutIncompleteVar(tokenlist,
                                     errorLogger,
                                     incompleteTok,
                                     "Skipping function due to incomplete variable " + incompleteTok->str());
            continue;
        }

        if (settings.daca && !settings.vfOptions.doConditionExpressionAnalysis)
            continue;

        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (!Token::simpleMatch(tok, "if ("))
                continue;
            Token* parenTok = tok->next();
            if (!Token::simpleMatch(parenTok->link(), ") {"))
                continue;
            const Token* condTok = parenTok->astOperand2();
            if (condTok->exprId() == 0)
                continue;
            if (condTok->hasKnownIntValue())
                continue;
            if (!isConstExpression(condTok, settings.library))
                continue;
            const bool isOp = condTok->isComparisonOp() || condTok->tokType() == Token::eLogicalOp;
            const bool is1 = isOp || astIsBool(condTok);

            Token* blockTok = parenTok->link()->tokAt(1);
            Token* startTok = blockTok;
            // Inner condition
            {
                for (const Token* condTok2 : getConditions(condTok, "&&")) {
                    if (is1) {
                        const bool isBool = astIsBool(condTok2) || Token::Match(condTok2, "%comp%|%oror%|&&");
                        auto a1 = makeSameExpressionAnalyzer(
                            condTok2,
                            makeConditionValue(1, condTok2, /*assume*/ true, !isBool, settings),
                            settings); // don't set '1' for non-boolean expressions
                        valueFlowGenericForward(startTok, startTok->link(), a1, tokenlist, errorLogger, settings);
                    }

                    auto a2 = makeOppositeExpressionAnalyzer(true,
                                                             condTok2,
                                                             makeConditionValue(0, condTok2, true, false, settings),
                                                             settings);
                    valueFlowGenericForward(startTok, startTok->link(), a2, tokenlist, errorLogger, settings);
                }
            }

            std::vector<const Token*> conds = getConditions(condTok, "||");
            if (conds.empty())
                continue;

            // Check else block
            if (Token::simpleMatch(startTok->link(), "} else {")) {
                startTok = startTok->link()->tokAt(2);
                for (const Token* condTok2 : conds) {
                    auto a1 = makeSameExpressionAnalyzer(condTok2,
                                                         makeConditionValue(0, condTok2, false, false, settings),
                                                         settings);
                    valueFlowGenericForward(startTok, startTok->link(), a1, tokenlist, errorLogger, settings);

                    if (is1) {
                        auto a2 =
                            makeOppositeExpressionAnalyzer(true,
                                                           condTok2,
                                                           makeConditionValue(isOp, condTok2, false, false, settings),
                                                           settings);
                        valueFlowGenericForward(startTok, startTok->link(), a2, tokenlist, errorLogger, settings);
                    }
                }
            }

            // Check if the block terminates early
            if (isEscapeScope(blockTok, settings)) {
                const Scope* scope2 = scope;
                // If escaping a loop then only use the loop scope
                if (isBreakOrContinueScope(blockTok->link())) {
                    scope2 = getLoopScope(blockTok->link());
                    if (!scope2)
                        continue;
                }
                for (const Token* condTok2 : conds) {
                    auto a1 = makeSameExpressionAnalyzer(condTok2,
                                                         makeConditionValue(0, condTok2, false, false, settings),
                                                         settings);
                    valueFlowGenericForward(startTok->link()->next(), scope2->bodyEnd, a1, tokenlist, errorLogger, settings);

                    if (is1) {
                        auto a2 = makeOppositeExpressionAnalyzer(true,
                                                                 condTok2,
                                                                 makeConditionValue(1, condTok2, false, false, settings),
                                                                 settings);
                        valueFlowGenericForward(startTok->link()->next(),
                                                scope2->bodyEnd,
                                                a2,
                                                tokenlist,
                                                errorLogger,
                                                settings);
                    }
                }
            }
        }
    }
}

static bool isTruncated(const ValueType* src, const ValueType* dst, const Settings& settings)
{
    if (src->pointer > 0 || dst->pointer > 0)
        return src->pointer != dst->pointer;
    if (src->smartPointer && dst->smartPointer)
        return false;
    if ((src->isIntegral() && dst->isIntegral()) || (src->isFloat() && dst->isFloat())) {
        const size_t srcSize = ValueFlow::getSizeOf(*src, settings, ValueFlow::Accuracy::LowerBound);
        const size_t dstSize = ValueFlow::getSizeOf(*dst, settings, ValueFlow::Accuracy::LowerBound);
        if (srcSize > dstSize)
            return true;
        if (srcSize == dstSize && src->sign != dst->sign)
            return true;
    } else if (src->type == dst->type) {
        if (src->type == ValueType::Type::RECORD)
            return src->typeScope != dst->typeScope;
    } else {
        return true;
    }
    return false;
}

static void setSymbolic(ValueFlow::Value& value, const Token* tok)
{
    assert(tok && tok->exprId() > 0 && "Missing expr id for symbolic value");
    value.valueType = ValueFlow::Value::ValueType::SYMBOLIC;
    value.tokvalue = tok;
}

static ValueFlow::Value makeSymbolic(const Token* tok, MathLib::bigint delta = 0)
{
    ValueFlow::Value value;
    value.setKnown();
    setSymbolic(value, tok);
    value.intvalue = delta;
    return value;
}

static std::set<nonneg int> getVarIds(const Token* tok)
{
    std::set<nonneg int> result;
    visitAstNodes(tok, [&](const Token* child) {
        if (child->varId() > 0)
            result.insert(child->varId());
        return ChildrenToVisit::op1_and_op2;
    });
    return result;
}

static void valueFlowSymbolic(const TokenList& tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger& errorLogger, const Settings& settings)
{
    for (const Scope* scope : symboldatabase.functionScopes) {
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (!Token::simpleMatch(tok, "="))
                continue;
            if (tok->astParent())
                continue;
            if (!tok->astOperand1())
                continue;
            if (!tok->astOperand2())
                continue;
            if (tok->astOperand1()->hasKnownIntValue())
                continue;
            if (tok->astOperand2()->hasKnownIntValue())
                continue;
            if (tok->astOperand1()->exprId() == 0)
                continue;
            if (tok->astOperand2()->exprId() == 0)
                continue;
            if (!isConstExpression(tok->astOperand2(), settings.library))
                continue;
            if (tok->astOperand1()->valueType() && tok->astOperand2()->valueType()) {
                if (isTruncated(
                        tok->astOperand2()->valueType(), tok->astOperand1()->valueType(), settings))
                    continue;
            } else if (isDifferentType(tok->astOperand2(), tok->astOperand1(), settings)) {
                continue;
            }
            const std::set<nonneg int> rhsVarIds = getVarIds(tok->astOperand2());
            const std::vector<const Variable*> vars = getLHSVariables(tok);
            if (std::any_of(vars.cbegin(), vars.cend(), [&](const Variable* var) {
                if (rhsVarIds.count(var->declarationId()) > 0)
                    return true;
                if (var->isLocal())
                    return var->isStatic();
                return !var->isArgument();
            }))
                continue;

            if (findAstNode(tok, [](const Token* child) {
                return child->isIncompleteVar();
            }))
                continue;

            Token* start = nextAfterAstRightmostLeaf(tok);
            const Token* end = ValueFlow::getEndOfExprScope(tok->astOperand1(), scope);

            ValueFlow::Value rhs = makeSymbolic(tok->astOperand2());
            rhs.errorPath.emplace_back(tok,
                                       tok->astOperand1()->expressionString() + " is assigned '" +
                                       tok->astOperand2()->expressionString() + "' here.");
            valueFlowForward(start, end, tok->astOperand1(), std::move(rhs), tokenlist, errorLogger, settings);

            ValueFlow::Value lhs = makeSymbolic(tok->astOperand1());
            lhs.errorPath.emplace_back(tok,
                                       tok->astOperand1()->expressionString() + " is assigned '" +
                                       tok->astOperand2()->expressionString() + "' here.");
            valueFlowForward(start, end, tok->astOperand2(), std::move(lhs), tokenlist, errorLogger, settings);
        }
    }
}

static const Token* isStrlenOf(const Token* tok, const Token* expr, int depth = 10)
{
    if (depth < 0)
        return nullptr;
    if (!tok)
        return nullptr;
    if (!expr)
        return nullptr;
    if (expr->exprId() == 0)
        return nullptr;
    if (Token::simpleMatch(tok->previous(), "strlen (")) {
        if (tok->astOperand2()->exprId() == expr->exprId())
            return tok;
    } else {
        for (const ValueFlow::Value& v : tok->values()) {
            if (!v.isSymbolicValue())
                continue;
            if (!v.isKnown())
                continue;
            if (v.intvalue != 0)
                continue;
            if (const Token* next = isStrlenOf(v.tokvalue, expr, depth - 1))
                return next;
        }
    }
    return nullptr;
}

static void valueFlowSymbolicOperators(const SymbolDatabase& symboldatabase, const Settings& settings)
{
    for (const Scope* scope : symboldatabase.functionScopes) {
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (tok->hasKnownIntValue())
                continue;

            if (Token::Match(tok, "abs|labs|llabs|fabs|fabsf|fabsl (")) {
                const Token* arg = tok->next()->astOperand2();
                if (!arg)
                    continue;
                if (arg->exprId() == 0)
                    continue;
                ValueFlow::Value c = inferCondition(">=", arg, 0);
                if (!c.isKnown())
                    continue;

                ValueFlow::Value v = makeSymbolic(arg);
                v.errorPath = c.errorPath;
                v.errorPath.emplace_back(tok, "Passed to " + tok->str());
                if (c.intvalue == 0)
                    v.setImpossible();
                else
                    v.setKnown();
                setTokenValue(tok->next(), std::move(v), settings);
            } else if (Token::Match(tok, "*|/|<<|>>|^|+|-|%or%")) {
                if (!tok->astOperand1())
                    continue;
                if (!tok->astOperand2())
                    continue;
                if (!astIsIntegral(tok->astOperand1(), false) && !astIsIntegral(tok->astOperand2(), false))
                    continue;
                const ValueFlow::Value* constant = nullptr;
                const Token* vartok = nullptr;
                if (const ValueFlow::Value* v = tok->astOperand1()->getKnownValue(ValueFlow::Value::ValueType::INT)) {
                    constant = v;
                    vartok = tok->astOperand2();
                }
                if (const ValueFlow::Value* v = tok->astOperand2()->getKnownValue(ValueFlow::Value::ValueType::INT)) {
                    constant = v;
                    vartok = tok->astOperand1();
                }
                if (!constant)
                    continue;
                if (!vartok)
                    continue;
                if (vartok->exprId() == 0)
                    continue;
                if (Token::Match(tok, "<<|>>|/") && !astIsLHS(vartok))
                    continue;
                if (Token::Match(tok, "<<|>>|^|+|-|%or%") && constant->intvalue != 0)
                    continue;
                if (Token::Match(tok, "*|/") && constant->intvalue != 1)
                    continue;
                std::vector<ValueFlow::Value> values = {makeSymbolic(vartok)};
                std::unordered_set<nonneg int> ids = {vartok->exprId()};
                std::copy_if(vartok->values().cbegin(),
                             vartok->values().cend(),
                             std::back_inserter(values),
                             [&](const ValueFlow::Value& v) {
                    if (!v.isSymbolicValue())
                        return false;
                    if (!v.tokvalue)
                        return false;
                    return ids.insert(v.tokvalue->exprId()).second;
                });
                for (ValueFlow::Value& v : values)
                    setTokenValue(tok, std::move(v), settings);
            } else if (Token::simpleMatch(tok, "[")) {
                const Token* arrayTok = tok->astOperand1();
                const Token* indexTok = tok->astOperand2();
                if (!arrayTok)
                    continue;
                if (!indexTok)
                    continue;
                for (const ValueFlow::Value& value : indexTok->values()) {
                    if (!value.isSymbolicValue())
                        continue;
                    if (value.intvalue != 0)
                        continue;
                    const Token* strlenTok = isStrlenOf(value.tokvalue, arrayTok);
                    if (!strlenTok)
                        continue;
                    ValueFlow::Value v = value;
                    v.bound = ValueFlow::Value::Bound::Point;
                    v.valueType = ValueFlow::Value::ValueType::INT;
                    v.errorPath.emplace_back(strlenTok, "Return index of first '\\0' character in string");
                    setTokenValue(tok, std::move(v), settings);
                }
            }
        }
    }
}

struct SymbolicInferModel : InferModel {
    const Token* expr;
    explicit SymbolicInferModel(const Token* tok) : expr(tok) {
        assert(expr->exprId() != 0);
    }
    bool match(const ValueFlow::Value& value) const override
    {
        return value.isSymbolicValue() && value.tokvalue && value.tokvalue->exprId() == expr->exprId();
    }
    ValueFlow::Value yield(MathLib::bigint value) const override
    {
        ValueFlow::Value result(value);
        result.valueType = ValueFlow::Value::ValueType::SYMBOLIC;
        result.tokvalue = expr;
        result.setKnown();
        return result;
    }
};

static void valueFlowSymbolicInfer(const SymbolDatabase& symboldatabase, const Settings& settings)
{
    for (const Scope* scope : symboldatabase.functionScopes) {
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (!Token::Match(tok, "-|%comp%"))
                continue;
            if (tok->hasKnownIntValue())
                continue;
            if (!tok->astOperand1())
                continue;
            if (!tok->astOperand2())
                continue;
            if (tok->astOperand1()->exprId() == 0)
                continue;
            if (tok->astOperand2()->exprId() == 0)
                continue;
            if (tok->astOperand1()->hasKnownIntValue())
                continue;
            if (tok->astOperand2()->hasKnownIntValue())
                continue;
            if (astIsFloat(tok->astOperand1(), false))
                continue;
            if (astIsFloat(tok->astOperand2(), false))
                continue;

            std::vector<ValueFlow::Value> values;
            {
                SymbolicInferModel leftModel{tok->astOperand1()};
                values = infer(leftModel, tok->str(), 0, tok->astOperand2()->values());
            }
            if (values.empty()) {
                SymbolicInferModel rightModel{tok->astOperand2()};
                values = infer(rightModel, tok->str(), tok->astOperand1()->values(), 0);
            }
            for (ValueFlow::Value& value : values) {
                setTokenValue(tok, std::move(value), settings);
            }
        }
    }
}

template<class ContainerOfValue>
static void valueFlowForwardConst(Token* start,
                                  const Token* end,
                                  const Variable* var,
                                  const ContainerOfValue& values,
                                  const Settings& settings,
                                  int /*unused*/ = 0)
{
    if (!precedes(start, end))
        throw InternalError(var->nameToken(), "valueFlowForwardConst: start token does not precede the end token.");
    for (Token* tok = start; tok != end; tok = tok->next()) {
        if (tok->varId() == var->declarationId()) {
            for (const ValueFlow::Value& value : values)
                setTokenValue(tok, value, settings);
        } else {
            [&] {
                // Follow references
                auto refs = followAllReferences(tok);
                auto it = std::find_if(refs.cbegin(), refs.cend(), [&](const ReferenceToken& ref) {
                    return ref.token->varId() == var->declarationId();
                });
                if (it != refs.end()) {
                    for (ValueFlow::Value value : values) {
                        if (refs.size() > 1)
                            value.setInconclusive();
                        value.errorPath.insert(value.errorPath.end(), it->errors.cbegin(), it->errors.cend());
                        setTokenValue(tok, std::move(value), settings);
                    }
                    return;
                }
                // Follow symbolic values
                for (const ValueFlow::Value& v : tok->values()) {
                    if (!v.isSymbolicValue())
                        continue;
                    if (!v.tokvalue)
                        continue;
                    if (v.tokvalue->varId() != var->declarationId())
                        continue;
                    for (ValueFlow::Value value : values) {
                        if (!v.isKnown() && value.isImpossible())
                            continue;
                        if (v.intvalue != 0) {
                            if (!value.isIntValue())
                                continue;
                            value.intvalue += v.intvalue;
                        }
                        if (!value.isImpossible())
                            value.valueKind = v.valueKind;
                        value.bound = v.bound;
                        value.errorPath.insert(value.errorPath.end(), v.errorPath.cbegin(), v.errorPath.cend());
                        setTokenValue(tok, std::move(value), settings);
                    }
                }
            }();
        }
    }
}

static void valueFlowForwardConst(Token* start,
                                  const Token* end,
                                  const Variable* var,
                                  const std::initializer_list<ValueFlow::Value>& values,
                                  const Settings& settings)
{
    valueFlowForwardConst(start, end, var, values, settings, 0);
}

static ValueFlow::Value::Bound findVarBound(const Variable* var,
                                            const Token* start,
                                            const Token* end,
                                            const Settings& settings)
{
    ValueFlow::Value::Bound result = ValueFlow::Value::Bound::Point;
    const Token* next = start;
    while ((next = findExpressionChangedSkipDeadCode(
                var->nameToken(), next->next(), end, settings, &evaluateKnownValues))) {
        ValueFlow::Value::Bound b = ValueFlow::Value::Bound::Point;
        if (next->varId() != var->declarationId())
            return ValueFlow::Value::Bound::Point;
        if (Token::simpleMatch(next->astParent(), "++"))
            b = ValueFlow::Value::Bound::Lower;
        else if (Token::simpleMatch(next->astParent(), "--"))
            b = ValueFlow::Value::Bound::Upper;
        else
            return ValueFlow::Value::Bound::Point;
        if (result == ValueFlow::Value::Bound::Point)
            result = b;
        else if (result != b)
            return ValueFlow::Value::Bound::Point;
    }
    return result;
}

static bool isInitialVarAssign(const Token* tok)
{
    if (!tok)
        return false;
    if (!tok->variable())
        return false;
    if (tok->variable()->nameToken() == tok)
        return true;
    const Token* prev = tok->tokAt(2);
    if (!Token::Match(prev, "%var% ; %var%"))
        return false;
    return tok->varId() == prev->varId() && tok->variable()->nameToken() == prev;
}

static void valueFlowForwardAssign(Token* const tok,
                                   const Token* expr,
                                   std::vector<const Variable*> vars,
                                   std::list<ValueFlow::Value> values,
                                   const bool init,
                                   const TokenList& tokenlist,
                                   ErrorLogger& errorLogger,
                                   const Settings& settings)
{
    if (Token::simpleMatch(tok->astParent(), "return"))
        return;
    const Token* endOfVarScope = ValueFlow::getEndOfExprScope(expr);
    if (std::any_of(values.cbegin(), values.cend(), std::mem_fn(&ValueFlow::Value::isLifetimeValue))) {
        valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
        values.remove_if(std::mem_fn(&ValueFlow::Value::isLifetimeValue));
    }
    if (std::all_of(
            vars.cbegin(), vars.cend(), [&](const Variable* var) {
        return !var->isPointer() && !var->isSmartPointer();
    }))
        values.remove_if(std::mem_fn(&ValueFlow::Value::isTokValue));
    if (tok->astParent()) {
        for (ValueFlow::Value& value : values) {
            std::string valueKind;
            if (value.valueKind == ValueFlow::Value::ValueKind::Impossible) {
                if (value.bound == ValueFlow::Value::Bound::Point)
                    valueKind = "never ";
                else if (value.bound == ValueFlow::Value::Bound::Lower)
                    valueKind = "less than ";
                else if (value.bound == ValueFlow::Value::Bound::Upper)
                    valueKind = "greater than ";
            }
            std::string info = "Assignment '" + tok->astParent()->expressionString() + "', assigned value is " + valueKind + value.infoString();
            value.errorPath.emplace_back(tok, std::move(info));
        }
    }

    if (tokenlist.isCPP() && vars.size() == 1 && Token::Match(vars.front()->typeStartToken(), "bool|_Bool")) {
        for (ValueFlow::Value& value : values) {
            if (value.isImpossible())
                continue;
            if (value.isIntValue())
                value.intvalue = (value.intvalue != 0);
            if (value.isTokValue())
                value.intvalue = (value.tokvalue != nullptr);
        }
    }

    // Static variable initialisation?
    if (vars.size() == 1 && vars.front()->isStatic() && !vars.front()->isConst() && init)
        lowerToPossible(values);

    // is volatile
    if (std::any_of(vars.cbegin(), vars.cend(), [&](const Variable* var) {
        return var->isVolatile();
    }))
        lowerToPossible(values);

    // Skip RHS
    Token* nextExpression = tok->astParent() ? nextAfterAstRightmostLeaf(tok->astParent()) : tok->next();
    if (!nextExpression)
        return;

    for (ValueFlow::Value& value : values) {
        if (value.isSymbolicValue())
            continue;
        if (value.isTokValue())
            continue;
        value.tokvalue = tok;
    }
    // Const variable
    if (expr->variable() && expr->variable()->isConst() && !expr->variable()->isReference()) {
        auto it = std::remove_if(values.begin(), values.end(), [](const ValueFlow::Value& value) {
            if (!value.isKnown())
                return false;
            if (value.isIntValue())
                return true;
            if (value.isFloatValue())
                return true;
            if (value.isContainerSizeValue())
                return true;
            if (value.isIteratorValue())
                return true;
            return false;
        });
        std::list<ValueFlow::Value> constValues;
        constValues.splice(constValues.end(), values, it, values.end());
        valueFlowForwardConst(nextExpression, endOfVarScope, expr->variable(), constValues, settings);
    }
    if (isInitialVarAssign(expr)) {
        // Check if variable is only incremented or decremented
        ValueFlow::Value::Bound b = findVarBound(expr->variable(), nextExpression, endOfVarScope, settings);
        if (b != ValueFlow::Value::Bound::Point) {
            auto knownValueIt = std::find_if(values.begin(), values.end(), [](const ValueFlow::Value& value) {
                if (!value.isKnown())
                    return false;
                return value.isIntValue();
            });
            if (knownValueIt != values.end()) {
                ValueFlow::Value value = *knownValueIt;
                value.bound = b;
                value.invertRange();
                value.setImpossible();
                valueFlowForwardConst(nextExpression, endOfVarScope, expr->variable(), {std::move(value)}, settings);
            }
        }
    }
    valueFlowForward(nextExpression, endOfVarScope, expr, std::move(values), tokenlist, errorLogger, settings);
}

static void valueFlowForwardAssign(Token* const tok,
                                   const Variable* const var,
                                   const std::list<ValueFlow::Value>& values,
                                   const bool /*unused*/,
                                   const bool init,
                                   const TokenList& tokenlist,
                                   ErrorLogger& errorLogger,
                                   const Settings& settings)
{
    valueFlowForwardAssign(tok, var->nameToken(), {var}, values, init, tokenlist, errorLogger, settings);
}

static std::list<ValueFlow::Value> truncateValues(std::list<ValueFlow::Value> values,
                                                  const ValueType* dst,
                                                  const ValueType* src,
                                                  const Settings& settings)
{
    if (!dst || !dst->isIntegral())
        return values;

    const size_t sz = ValueFlow::getSizeOf(*dst, settings, ValueFlow::Accuracy::ExactOrZero);

    if (src) {
        const size_t osz = ValueFlow::getSizeOf(*src, settings, ValueFlow::Accuracy::ExactOrZero);
        if (osz >= sz && dst->sign == ValueType::Sign::SIGNED && src->sign == ValueType::Sign::UNSIGNED) {
            values.remove_if([&](const ValueFlow::Value& value) {
                if (!value.isIntValue())
                    return false;
                if (!value.isImpossible())
                    return false;
                if (value.bound != ValueFlow::Value::Bound::Upper)
                    return false;
                if (osz == sz && value.intvalue < 0)
                    return true;
                if (osz > sz)
                    return true;
                return false;
            });
        }
    }

    for (ValueFlow::Value &value : values) {
        // Don't truncate impossible values since those can be outside of the valid range
        if (value.isImpossible())
            continue;
        if (value.isFloatValue()) {
            value.intvalue = static_cast<MathLib::bigint>(value.floatValue);
            value.valueType = ValueFlow::Value::ValueType::INT;
        }

        if (value.isIntValue() && sz > 0 && sz < sizeof(MathLib::biguint))
            value.intvalue = ValueFlow::truncateIntValue(value.intvalue, sz, dst->sign);
    }
    return values;
}

static bool isVariableInit(const Token *tok)
{
    if (!tok)
        return false;
    if (!Token::Match(tok->previous(), "%var% (|{"))
        return false;
    if (!tok->isBinaryOp() && !(tok->astOperand1() && tok->link() == tok->next()))
        return false;
    if (Token::simpleMatch(tok->astOperand2(), ","))
        return false;
    const Variable* var = tok->astOperand1()->variable();
    if (!var)
        return false;
    if (var->nameToken() != tok->astOperand1())
        return false;
    const ValueType* vt = var->valueType();
    if (!vt)
        return false;
    if (vt->type < ValueType::Type::VOID)
        return false;
    return true;
}

// Return true if two associative containers intersect
template<class C1, class C2>
static bool intersects(const C1& c1, const C2& c2)
{
    if (c1.size() > c2.size())
        return intersects(c2, c1);
    // NOLINTNEXTLINE(readability-use-anyofallof) - TODO: fix if possible / also Cppcheck false negative
    for (auto&& x : c1) {
        if (c2.find(x) != c2.end())
            return true;
    }
    return false;
}

static void valueFlowAfterAssign(TokenList &tokenlist,
                                 const SymbolDatabase& symboldatabase,
                                 ErrorLogger &errorLogger,
                                 const Settings &settings,
                                 const std::set<const Scope*>& skippedFunctions)
{
    for (const Scope * scope : symboldatabase.functionScopes) {
        if (skippedFunctions.count(scope))
            continue;
        std::unordered_map<nonneg int, std::unordered_set<nonneg int>> backAssigns;
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (!tok->scope()->isExecutable()) {
                tok = const_cast<Token*>(tok->scope()->bodyEnd); // skip local type definition
                continue;
            }

            // Assignment
            bool isInit = false;
            if (tok->str() != "=" && !(isInit = isVariableInit(tok)))
                continue;

            if (tok->astParent() && !((tok->astParent()->str() == ";" && astIsLHS(tok)) || tok->astParent()->str() == "*"))
                continue;

            // Lhs should be a variable
            if (!tok->astOperand1() || !tok->astOperand1()->exprId())
                continue;
            std::vector<const Variable*> vars = getLHSVariables(tok);

            // Rhs values..
            Token* rhs = tok->astOperand2();
            if (!rhs && isInit)
                rhs = tok;
            if (!rhs || rhs->values().empty())
                continue;

            std::list<ValueFlow::Value> values = truncateValues(
                rhs->values(), tok->astOperand1()->valueType(), rhs->valueType(), settings);
            // Remove known values
            std::set<ValueFlow::Value::ValueType> types;
            if (tok->astOperand1()->hasKnownValue()) {
                for (const ValueFlow::Value& value:tok->astOperand1()->values()) {
                    if (value.isKnown() && !value.isSymbolicValue())
                        types.insert(value.valueType);
                }
            }
            values.remove_if([&](const ValueFlow::Value& value) {
                return types.count(value.valueType) > 0;
            });
            // Remove container size if its not a container
            if (!astIsContainer(tok->astOperand2()))
                values.remove_if([&](const ValueFlow::Value& value) {
                    return value.valueType == ValueFlow::Value::ValueType::CONTAINER_SIZE;
                });
            // Remove symbolic values that are the same as the LHS
            values.remove_if([&](const ValueFlow::Value& value) {
                if (value.isSymbolicValue() && value.tokvalue)
                    return value.tokvalue->exprId() == tok->astOperand1()->exprId();
                return false;
            });
            // Find references to LHS in RHS
            auto isIncremental = [&](const Token* tok2) -> bool {
                return findAstNode(tok2,
                                   [&](const Token* child) {
                    return child->exprId() == tok->astOperand1()->exprId();
                });
            };
            // Check symbolic values as well
            const bool incremental = isIncremental(tok->astOperand2()) ||
                                     std::any_of(values.cbegin(), values.cend(), [&](const ValueFlow::Value& value) {
                if (!value.isSymbolicValue())
                    return false;
                return isIncremental(value.tokvalue);
            });
            // Remove values from the same assignment if it is incremental
            if (incremental) {
                values.remove_if([&](const ValueFlow::Value& value) {
                    if (value.tokvalue)
                        return value.tokvalue == tok->astOperand2();
                    return false;
                });
            }
            // If assignment copy by value, remove Uninit values..
            if ((tok->astOperand1()->valueType() && tok->astOperand1()->valueType()->pointer == 0) ||
                (tok->astOperand1()->variable() && tok->astOperand1()->variable()->isReference() && tok->astOperand1()->variable()->nameToken() == tok->astOperand1()))
                values.remove_if([&](const ValueFlow::Value& value) {
                    return value.isUninitValue();
                });
            if (values.empty())
                continue;
            const bool init = vars.size() == 1 && (vars.front()->nameToken() == tok->astOperand1() || tok->isSplittedVarDeclEq());
            valueFlowForwardAssign(
                rhs, tok->astOperand1(), std::move(vars), values, init, tokenlist, errorLogger, settings);
            // Back propagate symbolic values
            if (tok->astOperand1()->exprId() > 0) {
                Token* start = nextAfterAstRightmostLeaf(tok);
                const Token* end = scope->bodyEnd;
                // Collect symbolic ids
                std::unordered_set<nonneg int> ids;
                for (const ValueFlow::Value& value : values) {
                    if (!value.isSymbolicValue())
                        continue;
                    if (!value.tokvalue)
                        continue;
                    if (value.tokvalue->exprId() == 0)
                        continue;
                    ids.insert(value.tokvalue->exprId());
                }
                for (ValueFlow::Value value : values) {
                    if (!value.isSymbolicValue())
                        continue;
                    const Token* expr = value.tokvalue;
                    value.intvalue = -value.intvalue;
                    value.tokvalue = tok->astOperand1();

                    // Skip if it intersects with an already assigned symbol
                    auto& s = backAssigns[value.tokvalue->exprId()];
                    if (intersects(s, ids))
                        continue;
                    s.insert(expr->exprId());

                    value.errorPath.emplace_back(tok,
                                                 tok->astOperand1()->expressionString() + " is assigned '" +
                                                 tok->astOperand2()->expressionString() + "' here.");
                    valueFlowForward(start, end, expr, std::move(value), tokenlist, errorLogger, settings);
                }
            }
        }
    }
}

static std::vector<const Variable*> getVariables(const Token* tok)
{
    std::vector<const Variable*> result;
    visitAstNodes(tok, [&](const Token* child) {
        if (child->variable())
            result.push_back(child->variable());
        return ChildrenToVisit::op1_and_op2;
    });
    return result;
}

static void valueFlowAfterSwap(const TokenList& tokenlist,
                               const SymbolDatabase& symboldatabase,
                               ErrorLogger& errorLogger,
                               const Settings& settings)
{
    for (const Scope* scope : symboldatabase.functionScopes) {
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (!Token::simpleMatch(tok, "swap ("))
                continue;
            if (!Token::simpleMatch(tok->next()->astOperand2(), ","))
                continue;
            std::vector<Token*> args = astFlatten(tok->next()->astOperand2(), ",");
            if (args.size() != 2)
                continue;
            if (args[0]->exprId() == 0)
                continue;
            if (args[1]->exprId() == 0)
                continue;
            for (int i = 0; i < 2; i++) {
                std::vector<const Variable*> vars = getVariables(args[0]);
                const std::list<ValueFlow::Value>& values = args[0]->values();
                valueFlowForwardAssign(args[0], args[1], std::move(vars), values, false, tokenlist, errorLogger, settings);
                std::swap(args[0], args[1]);
            }
        }
    }
}

static void valueFlowSetConditionToKnown(const Token* tok, std::list<ValueFlow::Value>& values, bool then)
{
    if (values.empty())
        return;
    if (then && !Token::Match(tok, "==|!|("))
        return;
    if (!then && !Token::Match(tok, "!=|%var%|("))
        return;
    if (isConditionKnown(tok, then))
        changePossibleToKnown(values);
}

static bool isBreakScope(const Token* const endToken)
{
    if (!Token::simpleMatch(endToken, "}"))
        return false;
    if (!Token::simpleMatch(endToken->link(), "{"))
        return false;
    return Token::findmatch(endToken->link(), "break|goto", endToken);
}

ValueFlow::Value ValueFlow::asImpossible(ValueFlow::Value v)
{
    v.invertRange();
    v.setImpossible();
    return v;
}

static void insertImpossible(std::list<ValueFlow::Value>& values, const std::list<ValueFlow::Value>& input)
{
    std::transform(input.cbegin(), input.cend(), std::back_inserter(values), &ValueFlow::asImpossible);
}

static void insertNegateKnown(std::list<ValueFlow::Value>& values, const std::list<ValueFlow::Value>& input)
{
    for (ValueFlow::Value value:input) {
        if (!value.isIntValue() && !value.isContainerSizeValue())
            continue;
        value.intvalue = !value.intvalue;
        value.setKnown();
        values.push_back(std::move(value));
    }
}

struct ConditionHandler {
    struct Condition {
        const Token* vartok{};
        std::list<ValueFlow::Value> true_values;
        std::list<ValueFlow::Value> false_values;
        bool inverted = false;
        // Whether to insert impossible values for the condition or only use possible values
        bool impossible = true;

        bool isBool() const {
            return astIsBool(vartok);
        }

        static MathLib::bigint findPath(const std::list<ValueFlow::Value>& values)
        {
            auto it = std::find_if(values.cbegin(), values.cend(), [](const ValueFlow::Value& v) {
                return v.path > 0;
            });
            if (it == values.end())
                return 0;
            assert(std::all_of(it, values.end(), [&](const ValueFlow::Value& v) {
                return v.path == 0 || v.path == it->path;
            }));
            return it->path;
        }

        MathLib::bigint getPath() const
        {
            assert(std::abs(findPath(true_values) - findPath(false_values)) == 0);
            return findPath(true_values) | findPath(false_values);
        }

        Token* getContextAndValues(Token* condTok,
                                   std::list<ValueFlow::Value>& thenValues,
                                   std::list<ValueFlow::Value>& elseValues,
                                   bool known = false) const
        {
            const MathLib::bigint path = getPath();
            const bool allowKnown = path == 0;
            const bool allowImpossible = impossible && allowKnown;

            bool inverted2 = inverted;
            Token* ctx = skipNotAndCasts(condTok, &inverted2);
            bool then = !inverted || !inverted2;

            if (!Token::Match(condTok, "!=|=|(|.") && condTok != vartok) {
                thenValues.insert(thenValues.end(), true_values.cbegin(), true_values.cend());
                if (allowImpossible && (known || isConditionKnown(ctx, !then)))
                    insertImpossible(elseValues, false_values);
            }
            if (!Token::Match(condTok, "==|!")) {
                elseValues.insert(elseValues.end(), false_values.cbegin(), false_values.cend());
                if (allowImpossible && (known || isConditionKnown(ctx, then))) {
                    insertImpossible(thenValues, true_values);
                    if (isBool())
                        insertNegateKnown(thenValues, true_values);
                }
            }

            if (inverted2)
                std::swap(thenValues, elseValues);

            return ctx;
        }
    };

    virtual std::vector<Condition> parse(const Token* tok, const Settings& settings) const = 0;

    virtual Analyzer::Result forward(Token* start,
                                     const Token* stop,
                                     const Token* exprTok,
                                     const std::list<ValueFlow::Value>& values,
                                     TokenList& tokenlist,
                                     ErrorLogger& errorLogger,
                                     const Settings& settings,
                                     SourceLocation loc = SourceLocation::current()) const
    {
        return valueFlowForward(start->next(), stop, exprTok, values, tokenlist, errorLogger, settings, loc);
    }

    virtual Analyzer::Result forward(Token* top,
                                     const Token* exprTok,
                                     const std::list<ValueFlow::Value>& values,
                                     TokenList& tokenlist,
                                     ErrorLogger& errorLogger,
                                     const Settings& settings,
                                     SourceLocation loc = SourceLocation::current()) const
    {
        return valueFlowForwardRecursive(top, exprTok, values, tokenlist, errorLogger, settings, loc);
    }

    virtual void reverse(Token* start,
                         const Token* endToken,
                         const Token* exprTok,
                         const std::list<ValueFlow::Value>& values,
                         TokenList& tokenlist,
                         ErrorLogger& errorLogger,
                         const Settings& settings,
                         SourceLocation loc = SourceLocation::current()) const
    {
        valueFlowReverse(start, endToken, exprTok, values, tokenlist, errorLogger, settings, loc);
    }

    void traverseCondition(const SymbolDatabase& symboldatabase,
                           const Settings& settings,
                           const std::set<const Scope*>& skippedFunctions,
                           const std::function<void(const Condition& cond, Token* tok, const Scope* scope)>& f) const
    {
        for (const Scope *scope : symboldatabase.functionScopes) {
            if (skippedFunctions.count(scope))
                continue;
            for (auto *tok = const_cast<Token *>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
                if (Token::Match(tok, "if|while|for ("))
                    continue;
                if (Token::Match(tok, ":|;|,"))
                    continue;

                const Token* top = tok->astTop();

                if (!Token::Match(top->previous(), "if|while|for (") && !Token::Match(tok->astParent(), "&&|%oror%|?|!"))
                    continue;
                for (const Condition& cond : parse(tok, settings)) {
                    if (!cond.vartok)
                        continue;
                    if (cond.vartok->exprId() == 0)
                        continue;
                    if (cond.vartok->hasKnownIntValue())
                        continue;
                    if (cond.true_values.empty() || cond.false_values.empty())
                        continue;
                    if (!isConstExpression(cond.vartok, settings.library))
                        continue;
                    f(cond, tok, scope);
                }
            }
        }
    }

    void beforeCondition(TokenList& tokenlist,
                         const SymbolDatabase& symboldatabase,
                         ErrorLogger& errorLogger,
                         const Settings& settings,
                         const std::set<const Scope*>& skippedFunctions) const {
        traverseCondition(symboldatabase, settings, skippedFunctions, [&](const Condition& cond, Token* tok, const Scope*) {
            if (cond.vartok->exprId() == 0)
                return;

            // If condition is known then don't propagate value
            if (tok->hasKnownIntValue())
                return;

            Token* top = tok->astTop();

            if (Token::Match(top, "%assign%"))
                return;
            if (Token::Match(cond.vartok->astParent(), "%assign%|++|--"))
                return;

            if (Token::simpleMatch(tok->astParent(), "?") && tok->astParent()->isExpandedMacro()) {
                if (settings.debugwarnings)
                    bailout(tokenlist,
                            errorLogger,
                            tok,
                            "variable '" + cond.vartok->expressionString() + "', condition is defined in macro");
                return;
            }

            // if,macro => bailout
            if (Token::simpleMatch(top->previous(), "if (") && top->previous()->isExpandedMacro()) {
                if (settings.debugwarnings)
                    bailout(tokenlist,
                            errorLogger,
                            tok,
                            "variable '" + cond.vartok->expressionString() + "', condition is defined in macro");
                return;
            }

            if (cond.true_values.empty() && cond.false_values.empty())
                return;

            std::list<ValueFlow::Value> values = cond.true_values;
            if (cond.true_values != cond.false_values)
                values.insert(values.end(), cond.false_values.cbegin(), cond.false_values.cend());

            // extra logic for unsigned variables 'i>=1' => possible value can also be 0
            if (Token::Match(tok, "<|>|<=|>=")) {
                if (cond.vartok->valueType() && cond.vartok->valueType()->sign != ValueType::Sign::UNSIGNED)
                    return;

                values.remove_if([](const ValueFlow::Value& v) {
                    if (v.isIntValue())
                        return v.intvalue != 0;
                    return false;
                });
            }
            if (values.empty())
                return;

            // bailout: for/while-condition, variable is changed in while loop
            if (Token::Match(top->previous(), "for|while (") && Token::simpleMatch(top->link(), ") {")) {

                // Variable changed in 3rd for-expression
                if (Token::simpleMatch(top->previous(), "for (")) {
                    if (top->astOperand2() && top->astOperand2()->astOperand2() &&
                        findExpressionChanged(
                            cond.vartok, top->astOperand2()->astOperand2(), top->link(), settings)) {
                        if (settings.debugwarnings)
                            bailout(tokenlist,
                                    errorLogger,
                                    tok,
                                    "variable '" + cond.vartok->expressionString() + "' used in loop");
                        return;
                    }
                }

                // Variable changed in loop code
                const Token* const start = top;
                const Token* const block = top->link()->next();
                const Token* const end = block->link();

                if (findExpressionChanged(cond.vartok, start, end, settings)) {
                    // If its reassigned in loop then analyze from the end
                    if (!Token::Match(tok, "%assign%|++|--") &&
                        findExpression(cond.vartok->exprId(), start, end, [&](const Token* tok2) {
                        return Token::Match(tok2->astParent(), "%assign%") && astIsLHS(tok2);
                    }) && !findEscapeStatement(block->scope(), settings.library)) {
                        // Start at the end of the loop body
                        Token* bodyTok = top->link()->next();
                        reverse(bodyTok->link(), bodyTok, cond.vartok, values, tokenlist, errorLogger, settings);
                    }
                    if (settings.debugwarnings)
                        bailout(tokenlist,
                                errorLogger,
                                tok,
                                "variable '" + cond.vartok->expressionString() + "' used in loop");
                    return;
                }
            }

            Token* startTok = nullptr;
            if (astIsRHS(tok))
                startTok = tok->astParent();
            else if (astIsLHS(tok))
                startTok = previousBeforeAstLeftmostLeaf(tok->astParent());
            if (!startTok)
                startTok = tok->previous();

            reverse(startTok, nullptr, cond.vartok, values, tokenlist, errorLogger, settings);
        });
    }

    static Token* skipNotAndCasts(Token* tok, bool* inverted = nullptr)
    {
        for (; tok->astParent(); tok = tok->astParent()) {
            if (Token::simpleMatch(tok->astParent(), "!")) {
                if (inverted)
                    *inverted ^= true;
                continue;
            }
            if (Token::Match(tok->astParent(), "==|!=")) {
                const Token* sibling = tok->astSibling();
                if (sibling->hasKnownIntValue() && (astIsBool(tok) || astIsBool(sibling))) {
                    const bool value = !!sibling->getKnownIntValue();
                    if (inverted)
                        *inverted ^= value == Token::simpleMatch(tok->astParent(), "!=");
                    continue;
                }
            }
            if (tok->astParent()->isCast() && astIsBool(tok->astParent()))
                continue;
            return tok;
        }
        return tok;
    }

    static void fillFromPath(ProgramMemory& pm, const Token* top, MathLib::bigint path, const Settings& settings)
    {
        if (path < 1)
            return;
        visitAstNodes(top, [&](const Token* tok) {
            const ValueFlow::Value* v = ValueFlow::findValue(tok->values(), settings, [&](const ValueFlow::Value& v) {
                return v.path == path && isNonConditionalPossibleIntValue(v);
            });
            if (v == nullptr)
                return ChildrenToVisit::op1_and_op2;
            pm.setValue(tok, *v);
            return ChildrenToVisit::op1_and_op2;
        });
    }

    void afterCondition(TokenList& tokenlist,
                        const SymbolDatabase& symboldatabase,
                        ErrorLogger& errorLogger,
                        const Settings& settings,
                        const std::set<const Scope*>& skippedFunctions) const {
        traverseCondition(symboldatabase, settings, skippedFunctions, [&](const Condition& cond, Token* condTok, const Scope* scope) {
            const MathLib::bigint path = cond.getPath();
            const bool allowKnown = path == 0;

            std::list<ValueFlow::Value> thenValues;
            std::list<ValueFlow::Value> elseValues;

            Token* ctx = cond.getContextAndValues(condTok, thenValues, elseValues);

            if (Token::Match(ctx->astParent(), "%oror%|&&")) {
                Token* parent = ctx->astParent();
                if (astIsRHS(ctx) && astIsLHS(parent) && parent->astParent() &&
                    parent->str() == parent->astParent()->str())
                    parent = parent->astParent();
                else if (!astIsLHS(ctx)) {
                    parent = nullptr;
                }
                if (parent) {
                    std::vector<Token*> nextExprs = {parent->astOperand2()};
                    if (astIsLHS(parent) && parent->astParent() && parent->astParent()->str() == parent->str()) {
                        nextExprs.push_back(parent->astParent()->astOperand2());
                    }
                    std::list<ValueFlow::Value> andValues;
                    std::list<ValueFlow::Value> orValues;
                    cond.getContextAndValues(condTok, andValues, orValues, true);

                    const std::string& op(parent->str());
                    std::list<ValueFlow::Value> values;
                    if (op == "&&")
                        values = std::move(andValues);
                    else if (op == "||")
                        values = std::move(orValues);
                    if (allowKnown && (Token::Match(condTok, "==|!=") || cond.isBool()))
                        changePossibleToKnown(values);
                    if (astIsFloat(cond.vartok, false) ||
                        (!cond.vartok->valueType() &&
                         std::all_of(values.cbegin(), values.cend(), [](const ValueFlow::Value& v) {
                        return v.isIntValue() || v.isFloatValue();
                    })))
                        values.remove_if([&](const ValueFlow::Value& v) {
                            return v.isImpossible();
                        });
                    for (Token* start:nextExprs) {
                        Analyzer::Result r = forward(start, cond.vartok, values, tokenlist, errorLogger, settings);
                        if (r.terminate != Analyzer::Terminate::None || r.action.isModified())
                            return;
                    }
                }
            }

            {
                const Token* tok2 = condTok;
                std::string op;
                bool mixedOperators = false;
                while (tok2->astParent()) {
                    const Token* parent = tok2->astParent();
                    if (Token::Match(parent, "%oror%|&&")) {
                        if (op.empty()) {
                            op = parent->str();
                        } else if (op != parent->str()) {
                            mixedOperators = true;
                            break;
                        }
                    }
                    if (parent->str() == "!") {
                        op = (op == "&&" ? "||" : "&&");
                    }
                    tok2 = parent;
                }

                if (mixedOperators) {
                    return;
                }
            }

            Token* top = condTok->astTop();

            if (top->previous()->isExpandedMacro()) {
                for (std::list<ValueFlow::Value>* values : {&thenValues, &elseValues}) {
                    for (ValueFlow::Value& v : *values)
                        v.macro = true;
                }
            }

            Token* condTop = ctx->astParent();
            {
                bool inverted2 = false;
                while (Token::Match(condTop, "%oror%|&&")) {
                    Token* parent = skipNotAndCasts(condTop, &inverted2)->astParent();
                    if (!parent)
                        break;
                    condTop = parent;
                }
                if (inverted2)
                    std::swap(thenValues, elseValues);
            }

            if (!condTop)
                return;

            if (Token::simpleMatch(condTop, "?")) {
                Token* colon = condTop->astOperand2();
                forward(colon->astOperand1(), cond.vartok, thenValues, tokenlist, errorLogger, settings);
                forward(colon->astOperand2(), cond.vartok, elseValues, tokenlist, errorLogger, settings);
                // TODO: Handle after condition
                return;
            }

            if (condTop != top && condTop->str() != ";")
                return;

            if (!Token::Match(top->previous(), "if|while|for ("))
                return;

            if (top->strAt(-1) == "for") {
                if (!Token::Match(condTok, "%comp%"))
                    return;
                if (!Token::simpleMatch(condTok->astParent(), ";"))
                    return;
                const Token* stepTok = getStepTok(top);
                if (cond.vartok->varId() == 0)
                    return;
                if (!cond.vartok->variable())
                    return;
                if (!Token::Match(stepTok, "++|--"))
                    return;
                std::set<ValueFlow::Value::Bound> bounds;
                for (const ValueFlow::Value& v : thenValues) {
                    if (v.bound != ValueFlow::Value::Bound::Point && v.isImpossible())
                        continue;
                    bounds.insert(v.bound);
                }
                if (Token::simpleMatch(stepTok, "++") && bounds.count(ValueFlow::Value::Bound::Lower) > 0)
                    return;
                if (Token::simpleMatch(stepTok, "--") && bounds.count(ValueFlow::Value::Bound::Upper) > 0)
                    return;
                const Token* childTok = condTok->astOperand1();
                if (!childTok)
                    childTok = condTok->astOperand2();
                if (!childTok)
                    return;
                if (childTok->varId() != cond.vartok->varId())
                    return;
                const Token* startBlock = top->link()->next();
                if (isVariableChanged(startBlock,
                                      startBlock->link(),
                                      cond.vartok->varId(),
                                      cond.vartok->variable()->isGlobal(),
                                      settings))
                    return;
                // Check if condition in for loop is always false
                const Token* initTok = getInitTok(top);
                ProgramMemory pm;
                fillFromPath(pm, initTok, path, settings);
                fillFromPath(pm, condTok, path, settings);
                execute(initTok, pm, nullptr, nullptr, settings);
                MathLib::bigint result = 1;
                execute(condTok, pm, &result, nullptr, settings);
                if (result == 0)
                    return;
                // Remove condition since for condition is not redundant
                for (std::list<ValueFlow::Value>* values : {&thenValues, &elseValues}) {
                    for (ValueFlow::Value& v : *values) {
                        v.condition = nullptr;
                        v.conditional = true;
                    }
                }
            }

            bool deadBranch[] = {false, false};
            // start token of conditional code
            Token* startTokens[] = {nullptr, nullptr};
            // determine startToken(s)
            if (Token::simpleMatch(top->link(), ") {"))
                startTokens[0] = top->link()->next();
            if (Token::simpleMatch(top->link()->linkAt(1), "} else {"))
                startTokens[1] = top->link()->linkAt(1)->tokAt(2);

            int changeBlock = -1;
            int bailBlock = -1;

            for (int i = 0; i < 2; i++) {
                const Token* const startToken = startTokens[i];
                if (!startToken)
                    continue;
                std::list<ValueFlow::Value>& values = (i == 0 ? thenValues : elseValues);
                if (allowKnown)
                    valueFlowSetConditionToKnown(condTok, values, i == 0);

                Analyzer::Result r = forward(startTokens[i], startTokens[i]->link(), cond.vartok, values, tokenlist, errorLogger, settings);
                deadBranch[i] = r.terminate == Analyzer::Terminate::Escape;
                if (r.action.isModified() && !deadBranch[i])
                    changeBlock = i;
                if (r.terminate != Analyzer::Terminate::None && r.terminate != Analyzer::Terminate::Escape &&
                    r.terminate != Analyzer::Terminate::Modified)
                    bailBlock = i;
                changeKnownToPossible(values);
            }
            if (changeBlock >= 0 && !Token::simpleMatch(top->previous(), "while (")) {
                if (settings.debugwarnings)
                    bailout(tokenlist,
                            errorLogger,
                            startTokens[changeBlock]->link(),
                            "valueFlowAfterCondition: " + cond.vartok->expressionString() +
                            " is changed in conditional block");
                return;
            }
            if (bailBlock >= 0) {
                if (settings.debugwarnings)
                    bailout(tokenlist,
                            errorLogger,
                            startTokens[bailBlock]->link(),
                            "valueFlowAfterCondition: bailing in conditional block");
                return;
            }

            // After conditional code..
            if (Token::simpleMatch(top->link(), ") {")) {
                Token* after = top->link()->linkAt(1);
                bool dead_if = deadBranch[0];
                bool dead_else = deadBranch[1];
                const Token* unknownFunction = nullptr;
                if (condTok->astParent() && Token::Match(top->previous(), "while|for ("))
                    dead_if = !isBreakScope(after);
                else if (!dead_if)
                    dead_if = isReturnScope(after, settings.library, &unknownFunction);

                if (!dead_if && unknownFunction) {
                    if (settings.debugwarnings)
                        bailout(tokenlist, errorLogger, unknownFunction, "possible noreturn scope");
                    return;
                }

                if (Token::simpleMatch(after, "} else {")) {
                    after = after->linkAt(2);
                    unknownFunction = nullptr;
                    if (!dead_else)
                        dead_else = isReturnScope(after, settings.library, &unknownFunction);
                    if (!dead_else && unknownFunction) {
                        if (settings.debugwarnings)
                            bailout(tokenlist, errorLogger, unknownFunction, "possible noreturn scope");
                        return;
                    }
                }

                if (dead_if && dead_else)
                    return;

                std::list<ValueFlow::Value> values;
                if (dead_if) {
                    values = std::move(elseValues);
                } else if (dead_else) {
                    values = std::move(thenValues);
                } else {
                    std::copy_if(thenValues.cbegin(),
                                 thenValues.cend(),
                                 std::back_inserter(values),
                                 std::mem_fn(&ValueFlow::Value::isPossible));
                    std::copy_if(elseValues.cbegin(),
                                 elseValues.cend(),
                                 std::back_inserter(values),
                                 std::mem_fn(&ValueFlow::Value::isPossible));
                }

                if (values.empty())
                    return;

                if (dead_if || dead_else) {
                    const Token* parent = condTok->astParent();
                    // Skip the not operator
                    while (Token::simpleMatch(parent, "!"))
                        parent = parent->astParent();
                    bool possible = false;
                    if (Token::Match(parent, "&&|%oror%")) {
                        const std::string& op(parent->str());
                        while (parent && parent->str() == op)
                            parent = parent->astParent();
                        if (Token::simpleMatch(parent, "!") || Token::simpleMatch(parent, "== false"))
                            possible = op == "||";
                        else
                            possible = op == "&&";
                    }
                    if (possible) {
                        values.remove_if(std::mem_fn(&ValueFlow::Value::isImpossible));
                        changeKnownToPossible(values);
                    } else if (allowKnown) {
                        valueFlowSetConditionToKnown(condTok, values, true);
                        valueFlowSetConditionToKnown(condTok, values, false);
                    }
                }
                if (values.empty())
                    return;
                const bool isKnown = std::any_of(values.cbegin(), values.cend(), [&](const ValueFlow::Value& v) {
                    return v.isKnown() || v.isImpossible();
                });
                if (isKnown && isBreakOrContinueScope(after)) {
                    const Scope* loopScope = getLoopScope(cond.vartok);
                    if (loopScope) {
                        Analyzer::Result r = forward(after, loopScope->bodyEnd, cond.vartok, values, tokenlist, errorLogger, settings);
                        if (r.terminate != Analyzer::Terminate::None)
                            return;
                        if (r.action.isModified())
                            return;
                        auto* start = const_cast<Token*>(loopScope->bodyEnd);
                        if (Token::simpleMatch(start, "} while (")) {
                            start = start->tokAt(2);
                            forward(start, start->link(), cond.vartok, values, tokenlist, errorLogger, settings);
                            start = start->link();
                        }
                        values.remove_if(std::mem_fn(&ValueFlow::Value::isImpossible));
                        changeKnownToPossible(values);
                    }
                }
                forward(after, ValueFlow::getEndOfExprScope(cond.vartok, scope), cond.vartok, values, tokenlist, errorLogger, settings);
            }
        });
    }
    virtual ~ConditionHandler() = default;
    ConditionHandler(const ConditionHandler&) = default;
protected:
    ConditionHandler() = default;
};

static void valueFlowCondition(const ValuePtr<ConditionHandler>& handler,
                               TokenList& tokenlist,
                               SymbolDatabase& symboldatabase,
                               ErrorLogger& errorLogger,
                               const Settings& settings,
                               const std::set<const Scope*>& skippedFunctions)
{
    handler->beforeCondition(tokenlist, symboldatabase, errorLogger, settings, skippedFunctions);
    handler->afterCondition(tokenlist, symboldatabase, errorLogger, settings, skippedFunctions);
}

struct SimpleConditionHandler : ConditionHandler {
    std::vector<Condition> parse(const Token* tok, const Settings& /*settings*/) const override {

        std::vector<Condition> conds;
        parseCompareEachInt(tok, [&](const Token* vartok, ValueFlow::Value true_value, ValueFlow::Value false_value) {
            if (vartok->hasKnownIntValue())
                return;
            if (vartok->str() == "=" && vartok->astOperand1() && vartok->astOperand2())
                vartok = vartok->astOperand1();
            Condition cond;
            cond.true_values.push_back(std::move(true_value));
            cond.false_values.push_back(std::move(false_value));
            cond.vartok = vartok;
            conds.push_back(std::move(cond));
        });
        if (!conds.empty())
            return conds;

        const Token* vartok = nullptr;

        if (tok->str() == "!") {
            vartok = tok->astOperand1();

        } else if (tok->astParent() && (Token::Match(tok->astParent(), "%oror%|&&|?") ||
                                        Token::Match(tok->astParent()->previous(), "if|while ("))) {
            if (Token::simpleMatch(tok, "="))
                vartok = tok->astOperand1();
            else if (!Token::Match(tok, "%comp%|%assign%"))
                vartok = tok;
        }

        if (!vartok)
            return {};
        Condition cond;
        cond.true_values.emplace_back(tok, 0LL);
        cond.false_values.emplace_back(tok, 0LL);
        cond.vartok = vartok;

        return {std::move(cond)};
    }
};

struct IteratorInferModel : InferModel {
    virtual ValueFlow::Value::ValueType getType() const = 0;
    bool match(const ValueFlow::Value& value) const override {
        return value.valueType == getType();
    }
    ValueFlow::Value yield(MathLib::bigint value) const override
    {
        ValueFlow::Value result(value);
        result.valueType = getType();
        result.setKnown();
        return result;
    }
};

struct EndIteratorInferModel : IteratorInferModel {
    ValueFlow::Value::ValueType getType() const override {
        return ValueFlow::Value::ValueType::ITERATOR_END;
    }
};

struct StartIteratorInferModel : IteratorInferModel {
    ValueFlow::Value::ValueType getType() const override {
        return ValueFlow::Value::ValueType::ITERATOR_END;
    }
};

static bool isIntegralOnlyOperator(const Token* tok) {
    return Token::Match(tok, "%|<<|>>|&|^|~|%or%");
}

static bool isIntegralOrPointer(const Token* tok)
{
    if (!tok)
        return false;
    if (astIsIntegral(tok, false))
        return true;
    if (astIsPointer(tok))
        return true;
    if (Token::Match(tok, "NULL|nullptr"))
        return true;
    if (tok->valueType())
        return false;
    // These operators only work on integers
    if (isIntegralOnlyOperator(tok))
        return true;
    if (isIntegralOnlyOperator(tok->astParent()))
        return true;
    if (Token::Match(tok, "+|-|*|/") && tok->isBinaryOp())
        return isIntegralOrPointer(tok->astOperand1()) && isIntegralOrPointer(tok->astOperand2());
    return false;
}

static void valueFlowInferCondition(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->astParent())
            continue;
        if (tok->hasKnownIntValue())
            continue;
        if (Token::Match(tok, "%comp%|-") && tok->astOperand1() && tok->astOperand2()) {
            if (astIsIterator(tok->astOperand1()) || astIsIterator(tok->astOperand2())) {
                static const std::array<ValuePtr<InferModel>, 2> iteratorModels = {EndIteratorInferModel{},
                                                                                   StartIteratorInferModel{}};
                for (const ValuePtr<InferModel>& model : iteratorModels) {
                    std::vector<ValueFlow::Value> result =
                        infer(model, tok->str(), tok->astOperand1()->values(), tok->astOperand2()->values());
                    for (ValueFlow::Value value : result) {
                        value.valueType = ValueFlow::Value::ValueType::INT;
                        setTokenValue(tok, std::move(value), settings);
                    }
                }
            } else if (isIntegralOrPointer(tok->astOperand1()) && isIntegralOrPointer(tok->astOperand2())) {
                std::vector<ValueFlow::Value> result =
                    infer(makeIntegralInferModel(), tok->str(), tok->astOperand1()->values(), tok->astOperand2()->values());
                for (ValueFlow::Value& value : result) {
                    setTokenValue(tok, std::move(value), settings);
                }
            }
        } else if (Token::Match(tok->astParent(), "?|&&|!|%oror%") ||
                   Token::Match(tok->astParent()->previous(), "if|while (") ||
                   (astIsPointer(tok) && isUsedAsBool(tok, settings))) {
            std::vector<ValueFlow::Value> result = infer(makeIntegralInferModel(), "!=", tok->values(), 0);
            if (result.size() != 1)
                continue;
            ValueFlow::Value value = result.front();
            setTokenValue(tok, std::move(value), settings);
        }
    }
}

struct SymbolicConditionHandler : SimpleConditionHandler {

    static bool isNegatedBool(const Token* tok)
    {
        if (!Token::simpleMatch(tok, "!"))
            return false;
        return (astIsBool(tok->astOperand1()));
    }

    static const Token* skipNot(const Token* tok)
    {
        if (!Token::simpleMatch(tok, "!"))
            return tok;
        return tok->astOperand1();
    }

    std::vector<Condition> parse(const Token* tok, const Settings& settings) const override
    {
        if (!Token::Match(tok, "%comp%"))
            return {};
        if (tok->hasKnownIntValue())
            return {};
        if (!tok->astOperand1() || tok->astOperand1()->hasKnownIntValue() || tok->astOperand1()->isLiteral())
            return {};
        if (!tok->astOperand2() || tok->astOperand2()->hasKnownIntValue() || tok->astOperand2()->isLiteral())
            return {};
        if (!isConstExpression(tok, settings.library))
            return {};

        std::vector<Condition> result;
        auto addCond = [&](const Token* lhsTok, const Token* rhsTok, bool inverted) {
            for (int i = 0; i < 2; i++) {
                const bool lhs = i == 0;
                const Token* vartok = lhs ? lhsTok : rhsTok;
                const Token* valuetok = lhs ? rhsTok : lhsTok;
                if (valuetok->exprId() == 0)
                    continue;
                if (valuetok->hasKnownSymbolicValue(vartok))
                    continue;
                if (vartok->hasKnownSymbolicValue(valuetok))
                    continue;
                ValueFlow::Value true_value;
                ValueFlow::Value false_value;
                setConditionalValues(tok, !lhs, 0, true_value, false_value);
                setSymbolic(true_value, valuetok);
                setSymbolic(false_value, valuetok);

                Condition cond;
                cond.true_values = {std::move(true_value)};
                cond.false_values = {std::move(false_value)};
                cond.vartok = vartok;
                cond.inverted = inverted;
                result.push_back(std::move(cond));
            }
        };
        addCond(tok->astOperand1(), tok->astOperand2(), false);
        if (Token::Match(tok, "==|!=") && (isNegatedBool(tok->astOperand1()) || isNegatedBool(tok->astOperand2()))) {
            const Token* lhsTok = skipNot(tok->astOperand1());
            const Token* rhsTok = skipNot(tok->astOperand2());
            addCond(lhsTok, rhsTok, !(isNegatedBool(tok->astOperand1()) && isNegatedBool(tok->astOperand2())));
        }
        return result;
    }
};

static bool valueFlowForLoop2(const Token *tok,
                              ProgramMemory *memory1,
                              ProgramMemory *memory2,
                              ProgramMemory *memoryAfter,
                              const Settings& settings)
{
    // for ( firstExpression ; secondExpression ; thirdExpression )
    const Token *firstExpression  = tok->next()->astOperand2()->astOperand1();
    const Token *secondExpression = tok->next()->astOperand2()->astOperand2()->astOperand1();
    const Token *thirdExpression = tok->next()->astOperand2()->astOperand2()->astOperand2();

    ProgramMemory programMemory;
    MathLib::bigint result(0);
    bool error = false;
    execute(firstExpression, programMemory, &result, &error, settings);
    if (error)
        return false;
    execute(secondExpression, programMemory, &result, &error, settings);
    if (result == 0) // 2nd expression is false => no looping
        return false;
    if (error) {
        // If a variable is reassigned in second expression, return false
        bool reassign = false;
        visitAstNodes(secondExpression,
                      [&](const Token *t) {
            if (t->str() == "=" && t->astOperand1() && programMemory.hasValue(t->astOperand1()->varId()))
                // TODO: investigate what variable is assigned.
                reassign = true;
            return reassign ? ChildrenToVisit::done : ChildrenToVisit::op1_and_op2;
        });
        if (reassign)
            return false;
    }

    ProgramMemory startMemory(programMemory);
    ProgramMemory endMemory;

    int maxcount = settings.vfOptions.maxForLoopCount;
    while (result != 0 && !error && --maxcount > 0) {
        endMemory = programMemory;
        execute(thirdExpression, programMemory, &result, &error, settings);
        if (!error)
            execute(secondExpression, programMemory, &result, &error, settings);
    }
    // TODO: add bailout message

    if (memory1)
        memory1->swap(startMemory);
    if (!error) {
        if (memory2)
            memory2->swap(endMemory);
        if (memoryAfter)
            memoryAfter->swap(programMemory);
    }

    return true;
}

static void valueFlowForLoopSimplify(Token* const bodyStart,
                                     const Token* expr,
                                     bool globalvar,
                                     const MathLib::bigint value,
                                     const TokenList& tokenlist,
                                     ErrorLogger& errorLogger,
                                     const Settings& settings)
{
    // TODO: Refactor this to use arbitrary expressions
    assert(expr->varId() > 0);
    const Token * const bodyEnd = bodyStart->link();

    // Is variable modified inside for loop
    if (isVariableChanged(bodyStart, bodyEnd, expr->varId(), globalvar, settings))
        return;

    if (const Token* escape = findEscapeStatement(bodyStart->scope(), settings.library)) {
        if (settings.debugwarnings)
            bailout(tokenlist, errorLogger, escape, "For loop variable bailout on escape statement");
        return;
    }

    for (Token *tok2 = bodyStart->next(); tok2 != bodyEnd; tok2 = tok2->next()) {
        if (tok2->varId() == expr->varId()) {
            const Token * parent = tok2->astParent();
            while (parent) {
                const Token * const p = parent;
                parent = parent->astParent();
                if (!parent || parent->str() == ":")
                    break;
                if (parent->str() == "?") {
                    if (parent->astOperand2() != p)
                        parent = nullptr;
                    break;
                }
            }
            if (parent) {
                if (settings.debugwarnings)
                    bailout(tokenlist, errorLogger, tok2, "For loop variable " + tok2->str() + " stopping on ?");
                continue;
            }

            ValueFlow::Value value1(value);
            value1.varId = tok2->varId();
            setTokenValue(tok2, std::move(value1), settings);
        }

        if (Token::Match(tok2, "%oror%|&&")) {
            const ProgramMemory programMemory(getProgramMemory(tok2->astTop(), expr, ValueFlow::Value(value), settings));
            if ((tok2->str() == "&&" && !conditionIsTrue(tok2->astOperand1(), programMemory, settings)) ||
                (tok2->str() == "||" && !conditionIsFalse(tok2->astOperand1(), programMemory, settings))) {
                // Skip second expression..
                Token *parent = tok2;
                while (parent && parent->str() == tok2->str())
                    parent = parent->astParent();
                // Jump to end of condition
                if (parent && parent->str() == "(") {
                    tok2 = parent->link();
                    // cast
                    if (Token::simpleMatch(tok2, ") ("))
                        tok2 = tok2->linkAt(1);
                }
            }
        }
        const Token* vartok = expr;
        const Token* rml = nextAfterAstRightmostLeaf(vartok);
        if (rml)
            vartok = rml->str() == "]" ? rml : rml->previous();
        if (vartok->str() == "]" && vartok->link()->previous())
            vartok = vartok->link()->previous();

        if ((tok2->str() == "&&" &&
             conditionIsFalse(tok2->astOperand1(),
                              getProgramMemory(tok2->astTop(), expr, ValueFlow::Value(value), settings),
                              settings)) ||
            (tok2->str() == "||" &&
             conditionIsTrue(tok2->astOperand1(),
                             getProgramMemory(tok2->astTop(), expr, ValueFlow::Value(value), settings),
                             settings)))
            break;

        if (Token::simpleMatch(tok2, ") {")) {
            if (vartok->varId() && Token::findmatch(tok2->link(), "%varid%", tok2, vartok->varId())) {
                if (settings.debugwarnings)
                    bailout(tokenlist, errorLogger, tok2, "For loop variable skipping conditional scope");
                tok2 = tok2->linkAt(1);
                if (Token::simpleMatch(tok2, "} else {")) {
                    tok2 = tok2->linkAt(2);
                }
            }
            else {
                if (settings.debugwarnings)
                    bailout(tokenlist, errorLogger, tok2, "For loop skipping {} code");
                tok2 = tok2->linkAt(1);
                if (Token::simpleMatch(tok2, "} else {"))
                    tok2 = tok2->linkAt(2);
            }
        }
    }
}

static void valueFlowForLoopSimplifyAfter(Token* fortok, nonneg int varid, const MathLib::bigint num, const TokenList& tokenlist, ErrorLogger & errorLogger, const Settings& settings)
{
    const Token *vartok = nullptr;
    for (const Token *tok = fortok; tok; tok = tok->next()) {
        if (tok->varId() == varid) {
            vartok = tok;
            break;
        }
    }
    if (!vartok || !vartok->variable())
        return;

    const Variable *var = vartok->variable();
    const Token *endToken = nullptr;
    if (var->isLocal())
        endToken = var->scope()->bodyEnd;
    else
        endToken = fortok->scope()->bodyEnd;

    Token* blockTok = fortok->linkAt(1)->linkAt(1);
    if (blockTok != endToken) {
        ValueFlow::Value v{num};
        v.errorPath.emplace_back(fortok,"After for loop, " + var->name() + " has value " + v.infoString());

        valueFlowForward(blockTok->next(), endToken, vartok, std::move(v), tokenlist, errorLogger, settings);
    }
}

static void valueFlowForLoop(TokenList &tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger &errorLogger, const Settings &settings)
{
    for (const Scope &scope : symboldatabase.scopeList) {
        if (scope.type != ScopeType::eFor)
            continue;

        auto* tok = const_cast<Token*>(scope.classDef);
        auto* const bodyStart = const_cast<Token*>(scope.bodyStart);

        if (!Token::simpleMatch(tok->next()->astOperand2(), ";") ||
            !Token::simpleMatch(tok->next()->astOperand2()->astOperand2(), ";"))
            continue;

        nonneg int varid;
        bool knownInitValue, partialCond;
        MathLib::bigint initValue, stepValue, lastValue;

        if (extractForLoopValues(tok, varid, knownInitValue, initValue, partialCond, stepValue, lastValue)) {
            const bool executeBody = !knownInitValue || initValue <= lastValue;
            const Token* vartok = Token::findmatch(tok, "%varid%", bodyStart, varid);
            if (executeBody && vartok) {
                std::list<ValueFlow::Value> initValues;
                initValues.emplace_back(initValue, ValueFlow::Value::Bound::Lower);
                initValues.push_back(ValueFlow::asImpossible(initValues.back()));
                Analyzer::Result result = valueFlowForward(bodyStart, bodyStart->link(), vartok, std::move(initValues), tokenlist, errorLogger, settings);

                if (!result.action.isModified()) {
                    std::list<ValueFlow::Value> lastValues;
                    lastValues.emplace_back(lastValue, ValueFlow::Value::Bound::Upper);
                    lastValues.back().conditional = true;
                    lastValues.push_back(ValueFlow::asImpossible(lastValues.back()));
                    if (stepValue != 1)
                        lastValues.pop_front();
                    valueFlowForward(bodyStart, bodyStart->link(), vartok, std::move(lastValues), tokenlist, errorLogger, settings);
                }
            }
            const MathLib::bigint afterValue = executeBody ? lastValue + stepValue : initValue;
            valueFlowForLoopSimplifyAfter(tok, varid, afterValue, tokenlist, errorLogger, settings);
        } else {
            ProgramMemory mem1, mem2, memAfter;
            if (valueFlowForLoop2(tok, &mem1, &mem2, &memAfter, settings)) {
                for (const auto& p : mem1) {
                    if (!p.second.isIntValue())
                        continue;
                    if (p.second.isImpossible())
                        continue;
                    if (p.first.tok->varId() == 0)
                        continue;
                    valueFlowForLoopSimplify(bodyStart, p.first.tok, false, p.second.intvalue, tokenlist, errorLogger, settings);
                }
                for (const auto& p : mem2) {
                    if (!p.second.isIntValue())
                        continue;
                    if (p.second.isImpossible())
                        continue;
                    if (p.first.tok->varId() == 0)
                        continue;
                    valueFlowForLoopSimplify(bodyStart, p.first.tok, false, p.second.intvalue, tokenlist, errorLogger, settings);
                }
                for (const auto& p : memAfter) {
                    if (!p.second.isIntValue())
                        continue;
                    if (p.second.isImpossible())
                        continue;
                    if (p.first.tok->varId() == 0)
                        continue;
                    valueFlowForLoopSimplifyAfter(tok, p.first.getExpressionId(), p.second.intvalue, tokenlist, errorLogger, settings);
                }
            }
        }
    }
}

template<class Key, class F>
static bool productParams(const Settings& settings, const std::unordered_map<Key, std::list<ValueFlow::Value>>& vars, F f)
{
    using Args = std::vector<std::unordered_map<Key, ValueFlow::Value>>;
    Args args(1);
    // Compute cartesian product of all arguments
    for (const auto& p : vars) {
        if (p.second.empty())
            continue;
        args.back()[p.first] = p.second.front();
    }
    bool bail = false;
    int max = settings.vfOptions.maxSubFunctionArgs;
    for (const auto& p : vars) {
        if (args.size() > max) {
            bail = true;
            break;
        }
        if (p.second.empty())
            continue;
        std::for_each(std::next(p.second.begin()), p.second.end(), [&](const ValueFlow::Value& value) {
            Args new_args;
            for (auto arg : args) {
                if (value.path != 0) {
                    for (const auto& q : arg) {
                        if (q.first == p.first)
                            continue;
                        if (q.second.path == 0)
                            continue;
                        if (q.second.path != value.path)
                            return;
                    }
                }
                arg[p.first] = value;
                new_args.push_back(std::move(arg));
            }
            std::copy(new_args.cbegin(), new_args.cend(), std::back_inserter(args));
        });
    }

    if (args.size() > max) {
        bail = true;
        args.resize(max);
        // TODO: add bailout message
    }

    for (const auto& arg : args) {
        if (arg.empty())
            continue;
        // Make sure all arguments are the same path
        const MathLib::bigint path = arg.cbegin()->second.path;
        if (std::any_of(arg.cbegin(), arg.cend(), [&](const std::pair<Key, ValueFlow::Value>& p) {
            return p.second.path != path;
        }))
            continue;
        f(arg);
    }
    return !bail;
}

static void valueFlowInjectParameter(const TokenList& tokenlist,
                                     ErrorLogger& errorLogger,
                                     const Settings& settings,
                                     const Scope* functionScope,
                                     const std::unordered_map<const Variable*, std::list<ValueFlow::Value>>& vars)
{
    const bool r = productParams(settings, vars, [&](const std::unordered_map<const Variable*, ValueFlow::Value>& arg) {
        auto a = makeMultiValueFlowAnalyzer(arg, settings);
        valueFlowGenericForward(const_cast<Token*>(functionScope->bodyStart),
                                functionScope->bodyEnd,
                                a,
                                tokenlist,
                                errorLogger,
                                settings);
    });
    if (!r) {
        std::string fname = "<unknown>";
        if (const Function* f = functionScope->function)
            fname = f->name();
        if (settings.debugwarnings)
            bailout(tokenlist, errorLogger, functionScope->bodyStart, "Too many argument passed to " + fname);
    }
}

static void valueFlowInjectParameter(const TokenList& tokenlist,
                                     ErrorLogger& errorLogger,
                                     const Settings& settings,
                                     const Variable* arg,
                                     const Scope* functionScope,
                                     const std::list<ValueFlow::Value>& argvalues)
{
    // Is argument passed by value or const reference, and is it a known non-class type?
    if (arg->isReference() && !arg->isConst() && !arg->isClass())
        return;

    // Set value in function scope..
    const nonneg int varid2 = arg->declarationId();
    if (!varid2)
        return;

    valueFlowForward(const_cast<Token*>(functionScope->bodyStart->next()),
                     functionScope->bodyEnd,
                     arg->nameToken(),
                     argvalues,
                     tokenlist,
                     errorLogger,
                     settings);
}

static void valueFlowSwitchVariable(const TokenList& tokenlist,
                                    const SymbolDatabase& symboldatabase,
                                    ErrorLogger& errorLogger,
                                    const Settings& settings)
{
    for (const Scope& scope : symboldatabase.scopeList) {
        if (scope.type != ScopeType::eSwitch)
            continue;
        if (!Token::Match(scope.classDef, "switch ( %var% ) {"))
            continue;
        const Token* vartok = scope.classDef->tokAt(2);
        const Variable* var = vartok->variable();
        if (!var)
            continue;

        // bailout: global non-const variables
        if (!(var->isLocal() || var->isArgument()) && !var->isConst()) {
            if (settings.debugwarnings)
                bailout(tokenlist, errorLogger, vartok, "switch variable " + var->name() + " is global");
            continue;
        }

        for (const Token* tok = scope.bodyStart->next(); tok != scope.bodyEnd; tok = tok->next()) {
            if (tok->str() == "{") {
                tok = tok->link();
                continue;
            }
            if (Token::Match(tok, "case %num% :")) {
                std::list<ValueFlow::Value> values;
                values.emplace_back(MathLib::toBigNumber(tok->tokAt(1)));
                values.back().condition = tok;
                values.back().errorPath.emplace_back(tok,
                                                     "case " + tok->strAt(1) + ": " + vartok->str() + " is " +
                                                     tok->strAt(1) + " here.");
                bool known = false;
                if ((Token::simpleMatch(tok->previous(), "{") || Token::simpleMatch(tok->tokAt(-2), "break ;")) &&
                    !Token::Match(tok->tokAt(3), ";| case"))
                    known = true;
                while (Token::Match(tok->tokAt(3), ";| case %num% :")) {
                    known = false;
                    tok = tok->tokAt(3);
                    if (!tok->isName())
                        tok = tok->next();
                    values.emplace_back(MathLib::toBigNumber(tok->tokAt(1)));
                    values.back().condition = tok;
                    values.back().errorPath.emplace_back(tok,
                                                         "case " + tok->strAt(1) + ": " + vartok->str() + " is " +
                                                         tok->strAt(1) + " here.");
                }
                for (auto val = values.cbegin(); val != values.cend(); ++val) {
                    valueFlowReverse(tokenlist, const_cast<Token*>(scope.classDef), vartok, *val, errorLogger, settings);
                }
                if (vartok->variable()->scope()) {
                    if (known)
                        values.back().setKnown();

                    // FIXME We must check if there is a return. See #9276
                    /*
                       valueFlowForwardVariable(tok->tokAt(3),
                                             vartok->variable()->scope()->bodyEnd,
                                             vartok->variable(),
                                             vartok->varId(),
                                             values,
                                             values.back().isKnown(),
                                             false,
                                             tokenlist,
                                             errorLogger,
                                             settings);
                     */
                }
            }
        }
    }
}

static std::list<ValueFlow::Value> getFunctionArgumentValues(const Token* argtok)
{
    std::list<ValueFlow::Value> argvalues(argtok->values());
    removeImpossible(argvalues);
    if (argvalues.empty() && Token::Match(argtok, "%comp%|%oror%|&&|!")) {
        argvalues.emplace_back(0);
        argvalues.emplace_back(1);
    }
    return argvalues;
}

static void valueFlowLibraryFunction(Token* tok, const std::string& returnValue, const Settings& settings)
{
    std::unordered_map<nonneg int, std::list<ValueFlow::Value>> argValues;
    int argn = 1;
    for (const Token* argtok : getArguments(tok->previous())) {
        argValues[argn] = getFunctionArgumentValues(argtok);
        argn++;
    }
    if (returnValue.find("arg") != std::string::npos && argValues.empty())
        return;
    productParams(settings, argValues, [&](const std::unordered_map<nonneg int, ValueFlow::Value>& arg) {
        ValueFlow::Value value = evaluateLibraryFunction(arg, returnValue, settings, tok->isCpp());
        if (value.isUninitValue())
            return;
        ValueFlow::Value::ValueKind kind = ValueFlow::Value::ValueKind::Known;
        for (auto&& p : arg) {
            if (p.second.isPossible())
                kind = p.second.valueKind;
            if (p.second.isInconclusive()) {
                kind = p.second.valueKind;
                break;
            }
        }
        if (value.isImpossible() && kind != ValueFlow::Value::ValueKind::Known)
            return;
        if (!value.isImpossible())
            value.valueKind = kind;
        setTokenValue(tok, std::move(value), settings);
    });
}

static void valueFlowSubFunction(const TokenList& tokenlist,
                                 const SymbolDatabase& symboldatabase,
                                 ErrorLogger& errorLogger,
                                 const Settings& settings)
{
    int id = 0;
    for (auto it = symboldatabase.functionScopes.crbegin(); it != symboldatabase.functionScopes.crend(); ++it) {
        const Scope* scope = *it;
        const Function* function = scope->function;
        if (!function)
            continue;
        for (auto* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
            if (tok->isKeyword() || !Token::Match(tok, "%name% ("))
                continue;

            const Function* const calledFunction = tok->function();
            if (!calledFunction) {
                // library function?
                const std::string& returnValue(settings.library.returnValue(tok));
                if (!returnValue.empty())
                    valueFlowLibraryFunction(tok->next(), returnValue, settings);
                continue;
            }

            const Scope* const calledFunctionScope = calledFunction->functionScope;
            if (!calledFunctionScope)
                continue;

            id++;
            std::unordered_map<const Variable*, std::list<ValueFlow::Value>> argvars;
            // TODO: Rewrite this. It does not work well to inject 1 argument at a time.
            const std::vector<const Token*>& callArguments = getArguments(tok);
            for (int argnr = 0U; argnr < callArguments.size(); ++argnr) {
                const Token* argtok = callArguments[argnr];
                // Get function argument
                const Variable* const argvar = calledFunction->getArgumentVar(argnr);
                if (!argvar)
                    break;

                // passing value(s) to function
                std::list<ValueFlow::Value> argvalues(getFunctionArgumentValues(argtok));

                // Remove non-local lifetimes
                argvalues.remove_if([](const ValueFlow::Value& v) {
                    if (v.isLifetimeValue())
                        return !v.isLocalLifetimeValue() && !v.isSubFunctionLifetimeValue();
                    return false;
                });
                // Remove uninit values if argument is passed by value
                if (argtok->variable() && !argtok->variable()->isPointer() && argvalues.size() == 1 &&
                    argvalues.front().isUninitValue()) {
                    if (CheckUninitVar::isVariableUsage(argtok, settings.library, false, CheckUninitVar::Alloc::NO_ALLOC, 0))
                        continue;
                }

                if (argvalues.empty())
                    continue;

                // Error path..
                for (ValueFlow::Value& v : argvalues) {
                    const std::string nr = std::to_string(argnr + 1) + getOrdinalText(argnr + 1);

                    v.errorPath.emplace_back(argtok,
                                             "Calling function '" + calledFunction->name() + "', " + nr + " argument '" +
                                             argtok->expressionString() + "' value is " + v.infoString());
                    v.path = 256 * v.path + id % 256;
                    // Change scope of lifetime values
                    if (v.isLifetimeValue())
                        v.lifetimeScope = ValueFlow::Value::LifetimeScope::SubFunction;
                }

                // passed values are not "known"..
                lowerToPossible(argvalues);

                argvars[argvar] = std::move(argvalues);
            }
            valueFlowInjectParameter(tokenlist, errorLogger, settings, calledFunctionScope, argvars);
        }
    }
}

static void valueFlowFunctionDefaultParameter(const TokenList& tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger& errorLogger, const Settings& settings)
{
    if (!tokenlist.isCPP())
        return;

    for (const Scope* scope : symboldatabase.functionScopes) {
        const Function* function = scope->function;
        if (!function)
            continue;
        for (nonneg int arg = function->minArgCount(); arg < function->argCount(); arg++) {
            const Variable* var = function->getArgumentVar(arg);
            if (var && var->hasDefault() && Token::Match(var->nameToken(), "%var% = %num%|%str%|%char%|%name% [,)]")) {
                const std::list<ValueFlow::Value> &values = var->nameToken()->tokAt(2)->values();
                std::list<ValueFlow::Value> argvalues;
                for (const ValueFlow::Value &value : values) {
                    ValueFlow::Value v(value);
                    v.defaultArg = true;
                    v.changeKnownToPossible();
                    if (v.isPossible())
                        argvalues.push_back(std::move(v));
                }
                if (!argvalues.empty())
                    valueFlowInjectParameter(tokenlist, errorLogger, settings, var, scope, argvalues);
            }
        }
    }
}

static const ValueFlow::Value* getKnownValueFromToken(const Token* tok)
{
    if (!tok)
        return nullptr;
    auto it = std::find_if(tok->values().begin(), tok->values().end(), [&](const ValueFlow::Value& v) {
        return (v.isIntValue() || v.isContainerSizeValue() || v.isFloatValue()) && v.isKnown();
    });
    if (it == tok->values().end())
        return nullptr;
    return std::addressof(*it);
}

static std::vector<ValueFlow::Value> getCommonValuesFromTokens(const std::vector<const Token*>& toks)
{
    if (toks.empty())
        return {};
    std::vector<ValueFlow::Value> result;
    std::copy_if(toks.front()->values().begin(),
                 toks.front()->values().end(),
                 std::back_inserter(result),
                 [&](const ValueFlow::Value& v) {
        if (!v.isKnown() && !v.isImpossible())
            return false;
        return (v.isIntValue() || v.isContainerSizeValue() || v.isFloatValue());
    });
    std::for_each(toks.begin() + 1, toks.end(), [&](const Token* tok) {
        auto it = std::remove_if(result.begin(), result.end(), [&](const ValueFlow::Value& v) {
            return std::none_of(tok->values().begin(), tok->values().end(), [&](const ValueFlow::Value& v2) {
                return v.equalValue(v2) && v.valueKind == v2.valueKind;
            });
        });
        result.erase(it, result.end());
    });
    return result;
}

static void setFunctionReturnValue(const Function* f,
                                   Token* tok,
                                   ValueFlow::Value v,
                                   const Settings& settings,
                                   bool known = true)
{
    if (f->hasVirtualSpecifier()) {
        if (v.isImpossible())
            return;
        v.setPossible();
    } else if (!v.isImpossible() && known) {
        v.setKnown();
    }
    v.errorPath.emplace_back(tok, "Calling function '" + f->name() + "' returns " + v.toString());
    setTokenValue(tok, std::move(v), settings);
}

static void valueFlowFunctionReturn(TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings)
{
    for (Token* tok = tokenlist.back(); tok; tok = tok->previous()) {
        if (tok->str() != "(" || !tok->astOperand1() || tok->isCast())
            continue;

        const Function* function = nullptr;
        if (Token::Match(tok->previous(), "%name% ("))
            function = tok->previous()->function();
        else
            function = tok->astOperand1()->function();
        if (!function)
            continue;
        // TODO: Check if member variable is a pointer or reference
        if (function->isImplicitlyVirtual() && !function->hasFinalSpecifier())
            continue;

        if (tok->hasKnownValue())
            continue;

        std::vector<const Token*> returns = Function::findReturns(function);
        if (returns.empty())
            continue;

        bool hasKnownValue = false;

        for (const ValueFlow::Value& v : getCommonValuesFromTokens(returns)) {
            setFunctionReturnValue(function, tok, v, settings, false);
            if (v.isKnown())
                hasKnownValue = true;
        }

        if (hasKnownValue)
            continue;

        // Arguments..
        std::vector<const Token*> arguments = getArguments(tok);

        ProgramMemory programMemory;
        for (std::size_t i = 0; i < arguments.size(); ++i) {
            const Variable* const arg = function->getArgumentVar(i);
            if (!arg) {
                if (settings.debugwarnings)
                    bailout(tokenlist, errorLogger, tok, "function return; unhandled argument type");
                programMemory.clear();
                break;
            }
            const ValueFlow::Value* v = getKnownValueFromToken(arguments[i]);
            if (!v)
                continue;
            programMemory.setValue(arg->nameToken(), *v);
        }
        if (programMemory.empty() && !arguments.empty())
            continue;
        std::vector<ValueFlow::Value> values = execute(function->functionScope, programMemory, settings);
        for (const ValueFlow::Value& v : values) {
            if (v.isUninitValue())
                continue;
            setFunctionReturnValue(function, tok, v, settings);
        }
    }
}

static bool needsInitialization(const Variable* var)
{
    if (!var)
        return false;
    if (var->hasDefault())
        return false;
    if (var->isPointer())
        return true;
    if (var->type() && var->type()->isUnionType())
        return false;
    if (!var->nameToken()->isCpp())
        return true;
    if (var->type() && var->type()->needInitialization == Type::NeedInitialization::True)
        return true;
    if (var->valueType()) {
        if (var->valueType()->isPrimitive())
            return true;
        if (var->valueType()->type == ValueType::Type::POD)
            return true;
        if (var->valueType()->type == ValueType::Type::ITERATOR)
            return true;
        if (var->isStlType() && var->isArray()) {
            if (const Token* ctt = var->valueType()->containerTypeToken) {
                if (ctt->isStandardType())
                    return true;
                const Type* ct = ctt->type();
                if (ct && ct->needInitialization == Type::NeedInitialization::True)
                    return true;
            }
        }
    }
    return false;
}

static void addToErrorPath(ValueFlow::Value& value, const ValueFlow::Value& from)
{
    std::unordered_set<const Token*> locations;
    std::transform(value.errorPath.cbegin(),
                   value.errorPath.cend(),
                   std::inserter(locations, locations.begin()),
                   [](const ErrorPathItem& e) {
        return e.first;
    });
    if (from.condition && !value.condition)
        value.condition = from.condition;
    std::copy_if(from.errorPath.cbegin(),
                 from.errorPath.cend(),
                 std::back_inserter(value.errorPath),
                 [&](const ErrorPathItem& e) {
        return locations.insert(e.first).second;
    });
}

static std::vector<Token*> findAllUsages(const Variable* var,
                                         Token* start, // cppcheck-suppress constParameterPointer // FP
                                         const Library& library)
{
    // std::vector<Token*> result;
    const Scope* scope = var->scope();
    if (!scope)
        return {};
    return findTokensSkipDeadCode(library, start, scope->bodyEnd, [&](const Token* tok) {
        return tok->varId() == var->declarationId();
    });
}

static Token* findStartToken(const Variable* var, Token* start, const Library& library)
{
    std::vector<Token*> uses = findAllUsages(var, start, library);
    if (uses.empty())
        return start;
    Token* first = uses.front();
    if (Token::findmatch(start, "goto|asm|setjmp|longjmp", first))
        return start;
    if (first != var->nameToken()) {
        // if this is lhs in assignment then set first to the first token in LHS expression
        Token* temp = first;
        while (Token::Match(temp->astParent(), "[&*(]") && precedes(temp->astParent(), temp))
            temp = temp->astParent();
        if (Token::simpleMatch(temp->astParent(), "=") && precedes(temp, temp->astParent()))
            first = temp;
    }
    // If there is only one usage
    if (uses.size() == 1)
        return first->previous();
    const Scope* scope = first->scope();
    // If first usage is in variable scope
    if (scope == var->scope()) {
        bool isLoopExpression = false;
        for (const Token* parent = first; parent; parent = parent->astParent()) {
            if (Token::simpleMatch(parent->astParent(), ";") &&
                Token::simpleMatch(parent->astParent()->astParent(), ";") &&
                Token::simpleMatch(parent->astParent()->astParent()->astParent(), "(") &&
                Token::simpleMatch(parent->astParent()->astParent()->astParent()->astOperand1(), "for (") &&
                parent == parent->astParent()->astParent()->astParent()->astOperand2()->astOperand2()->astOperand2()) {
                isLoopExpression = true;
            }
        }
        return isLoopExpression ? start : first->previous();
    }
    // If all uses are in the same scope
    if (std::all_of(uses.begin() + 1, uses.end(), [&](const Token* tok) {
        return tok->scope() == scope;
    }))
        return first->previous();
    // Compute the outer scope
    while (scope && scope->nestedIn != var->scope())
        scope = scope->nestedIn;
    if (!scope)
        return start;
    auto* tok = const_cast<Token*>(scope->bodyStart);
    if (!tok)
        return start;
    if (Token::simpleMatch(tok->tokAt(-2), "} else {"))
        tok = tok->linkAt(-2);
    if (Token::simpleMatch(tok->previous(), ") {"))
        return tok->linkAt(-1)->previous();
    return tok;
}

static void valueFlowUninit(TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings)
{
    for (Token *tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->scope()->isExecutable())
            continue;
        if (!Token::Match(tok, "%var% ;|["))
            continue;
        const Variable* var = tok->variable();
        if (!var)
            continue;
        if (var->nameToken() != tok || var->isInit())
            continue;
        if (!needsInitialization(var))
            continue;
        if (!var->isLocal() || var->isStatic() || var->isExtern() || var->isReference() || var->isThrow())
            continue;

        ValueFlow::Value uninitValue;
        uninitValue.setKnown();
        uninitValue.valueType = ValueFlow::Value::ValueType::UNINIT;
        uninitValue.tokvalue = tok;
        if (var->isArray())
            uninitValue.indirect = var->dimensions().size();

        bool partial = false;

        Token* start = findStartToken(var, tok->next(), settings.library);

        std::map<Token*, ValueFlow::Value> partialReads;
        if (const Scope* scope = var->typeScope()) {
            if (Token::findsimplematch(scope->bodyStart, "union", scope->bodyEnd))
                continue;
            for (const Variable& memVar : scope->varlist) {
                if (!memVar.isPublic())
                    continue;
                // Skip array since we can't track partial initialization from nested subexpressions
                if (memVar.isArray())
                    continue;
                if (!needsInitialization(&memVar)) {
                    if (!var->isPointer())
                        partial = true;
                    continue;
                }
                auto partialReadsAnalyzer = std::make_shared<PartialReadContainer>();
                auto analyzer = makeMemberExpressionAnalyzer(memVar.nameToken()->str(), tok, uninitValue, partialReadsAnalyzer, settings);
                valueFlowGenericForward(start, tok->scope()->bodyEnd, analyzer, tokenlist, errorLogger, settings);

                for (auto&& p : *partialReadsAnalyzer) {
                    Token* tok2 = p.first;
                    const ValueFlow::Value& v = p.second;
                    // Try to insert into map
                    auto pp = partialReads.emplace(tok2, v);
                    ValueFlow::Value& v2 = pp.first->second;
                    const bool inserted = pp.second;
                    // Merge the two values if it is already in map
                    if (!inserted) {
                        if (v.valueType != v2.valueType)
                            continue;
                        addToErrorPath(v2, v);
                    }
                    v2.subexpressions.push_back(memVar.nameToken()->str());
                }
            }
        }

        for (auto&& p : partialReads) {
            Token* tok2 = p.first;
            ValueFlow::Value& v = p.second;

            setTokenValue(tok2, std::move(v), settings);
        }

        if (partial)
            continue;

        valueFlowForward(start, tok->scope()->bodyEnd, var->nameToken(), std::move(uninitValue), tokenlist, errorLogger, settings);
    }
}

static bool isContainerSizeChanged(const Token* expr,
                                   const Token* start,
                                   const Token* end,
                                   int indirect,
                                   const Settings& settings,
                                   int depth = 20);

static bool isContainerSizeChangedByFunction(const Token* tok,
                                             int indirect,
                                             const Settings& settings,
                                             int depth = 20)
{
    if (!tok->valueType())
        return false;
    if (!astIsContainer(tok))
        return false;
    // If we are accessing an element then we are not changing the container size
    if (Token::Match(tok, "%name% . %name% (")) {
        const Library::Container::Yield yield = getLibraryContainer(tok)->getYield(tok->strAt(2));
        if (yield != Library::Container::Yield::NO_YIELD)
            return false;
    }
    if (Token::simpleMatch(tok->astParent(), "["))
        return false;

    // address of variable
    const bool addressOf = tok->valueType()->pointer || (tok->astParent() && tok->astParent()->isUnaryOp("&"));

    int narg;
    const Token * ftok = getTokenArgumentFunction(tok, narg);
    if (!ftok)
        return false; // not a function => variable not changed
    const Function * fun = ftok->function();
    if (fun && !fun->isImplicitlyVirtual()) {
        const Variable *arg = fun->getArgumentVar(narg);
        if (arg) {
            const bool isPointer = addressOf || indirect > 0;
            if (!arg->isReference() && !isPointer)
                return false;
            if (!isPointer && arg->isConst())
                return false;
            if (arg->valueType() && arg->valueType()->constness == 1)
                return false;
            const Scope * scope = fun->functionScope;
            if (scope) {
                // Argument not used
                if (!arg->nameToken())
                    return false;
                if (depth > 0)
                    return isContainerSizeChanged(arg->nameToken(),
                                                  scope->bodyStart,
                                                  scope->bodyEnd,
                                                  addressOf ? indirect + 1 : indirect,
                                                  settings,
                                                  depth - 1);
            }
            // Don't know => Safe guess
            return true;
        }
    }

    bool inconclusive = false;
    const bool isChanged = isVariableChangedByFunctionCall(tok, indirect, settings, &inconclusive);
    return (isChanged || inconclusive);
}

static const Token* parseBinaryIntOp(const Token* expr,
                                     const std::function<std::vector<MathLib::bigint>(const Token*)>& eval,
                                     MathLib::bigint& known)
{
    if (!expr)
        return nullptr;
    if (!expr->astOperand1() || !expr->astOperand2())
        return nullptr;
    if (expr->astOperand1()->exprId() == 0 && expr->astOperand2()->exprId() == 0)
        return nullptr;
    std::vector<MathLib::bigint> x1 = eval(expr->astOperand1());
    if (expr->astOperand1()->exprId() == 0 && x1.empty())
        return nullptr;
    std::vector<MathLib::bigint> x2 = eval(expr->astOperand2());
    if (expr->astOperand2()->exprId() == 0 && x2.empty())
        return nullptr;
    const Token* varTok = nullptr;
    if (!x1.empty() && x2.empty()) {
        varTok = expr->astOperand2();
        known = x1.front();
    } else if (x1.empty() && !x2.empty()) {
        varTok = expr->astOperand1();
        known = x2.front();
    }
    return varTok;
}

const Token* ValueFlow::solveExprValue(const Token* expr,
                                       const std::function<std::vector<MathLib::bigint>(const Token*)>& eval,
                                       ValueFlow::Value& value)
{
    if (!value.isIntValue() && !value.isIteratorValue() && !value.isSymbolicValue())
        return expr;
    if (value.isSymbolicValue() && !Token::Match(expr, "+|-"))
        return expr;
    MathLib::bigint intval = 0;
    const Token* binaryTok = parseBinaryIntOp(expr, eval, intval);
    const bool rhs = astIsRHS(binaryTok);
    // If its on the rhs, then -1 multiplication is needed, which is not possible with simple delta analysis used currently for symbolic values
    if (value.isSymbolicValue() && rhs && Token::simpleMatch(expr, "-"))
        return expr;
    if (binaryTok && expr->str().size() == 1) {
        switch (expr->str()[0]) {
        case '+': {
            value.intvalue -= intval;
            return ValueFlow::solveExprValue(binaryTok, eval, value);
        }
        case '-': {
            if (rhs)
                value.intvalue = intval - value.intvalue;
            else
                value.intvalue += intval;
            return ValueFlow::solveExprValue(binaryTok, eval, value);
        }
        case '*': {
            if (intval == 0)
                break;
            value.intvalue /= intval;
            return ValueFlow::solveExprValue(binaryTok, eval, value);
        }
        case '^': {
            value.intvalue ^= intval;
            return ValueFlow::solveExprValue(binaryTok, eval, value);
        }
        }
    }
    return expr;
}

bool ValueFlow::isContainerSizeChanged(const Token* tok, int indirect, const Settings& settings, int depth)
{
    if (!tok)
        return false;
    if (!tok->valueType() || !tok->valueType()->container)
        return true;
    if (astIsLHS(tok) && Token::Match(tok->astParent(), "%assign%|<<"))
        return true;
    if (astIsLHS(tok) && Token::simpleMatch(tok->astParent(), "["))
        return tok->valueType()->container->stdAssociativeLike;
    const Library::Container::Action action = astContainerAction(tok, settings.library);
    switch (action) {
    case Library::Container::Action::RESIZE:
    case Library::Container::Action::CLEAR:
    case Library::Container::Action::PUSH:
    case Library::Container::Action::POP:
    case Library::Container::Action::CHANGE:
    case Library::Container::Action::INSERT:
    case Library::Container::Action::ERASE:
    case Library::Container::Action::APPEND:
        return true;
    case Library::Container::Action::NO_ACTION:
        // Is this an unknown member function call?
        if (astIsLHS(tok) && Token::Match(tok->astParent(), ". %name% (")) {
            const Library::Container::Yield yield = astContainerYield(tok, settings.library);
            return yield == Library::Container::Yield::NO_YIELD;
        }
        break;
    case Library::Container::Action::FIND:
    case Library::Container::Action::FIND_CONST:
    case Library::Container::Action::CHANGE_CONTENT:
    case Library::Container::Action::CHANGE_INTERNAL:
        break;
    }
    return isContainerSizeChangedByFunction(tok, indirect, settings, depth);
}

static bool isContainerSizeChanged(const Token* expr,
                                   const Token* start,
                                   const Token* end,
                                   int indirect,
                                   const Settings& settings,
                                   int depth)
{
    for (const Token *tok = start; tok != end; tok = tok->next()) {
        if (tok->exprId() != expr->exprId() && !isAliasOf(tok, expr))
            continue;
        if (ValueFlow::isContainerSizeChanged(tok, indirect, settings, depth))
            return true;
    }
    return false;
}

static void valueFlowSmartPointer(TokenList &tokenlist, ErrorLogger & errorLogger, const Settings &settings)
{
    for (Token *tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->scope())
            continue;
        if (!tok->scope()->isExecutable())
            continue;
        if (!astIsSmartPointer(tok))
            continue;
        if (tok->variable() && Token::Match(tok, "%var% (|{|;")) {
            const Variable* var = tok->variable();
            if (!var->isSmartPointer())
                continue;
            if (var->nameToken() == tok) {
                if (Token::Match(tok, "%var% (|{") && tok->next()->astOperand2() &&
                    tok->next()->astOperand2()->str() != ",") {
                    Token* inTok = tok->next()->astOperand2();
                    const std::list<ValueFlow::Value>& values = inTok->values();
                    const bool constValue = inTok->isNumber();
                    valueFlowForwardAssign(inTok, var, values, constValue, true, tokenlist, errorLogger, settings);

                } else if (Token::Match(tok, "%var% ;")) {
                    ValueFlow::Value v(0);
                    v.setKnown();
                    valueFlowForwardAssign(tok, var, {std::move(v)}, false, true, tokenlist, errorLogger, settings);
                }
            }
        } else if (astIsLHS(tok) && Token::Match(tok->astParent(), ". %name% (") &&
                   tok->astParent()->originalName() != "->") {
            std::vector<const Variable*> vars = getVariables(tok);
            Token* ftok = tok->astParent()->tokAt(2);
            if (Token::simpleMatch(tok->astParent(), ". reset (")) {
                if (Token::simpleMatch(ftok, "( )")) {
                    ValueFlow::Value v(0);
                    v.setKnown();
                    valueFlowForwardAssign(ftok, tok, std::move(vars), {std::move(v)}, false, tokenlist, errorLogger, settings);
                } else {
                    tok->removeValues(std::mem_fn(&ValueFlow::Value::isIntValue));
                    Token* inTok = ftok->astOperand2();
                    if (!inTok)
                        continue;
                    const std::list<ValueFlow::Value>& values = inTok->values();
                    valueFlowForwardAssign(inTok, tok, std::move(vars), values, false, tokenlist, errorLogger, settings);
                }
            } else if (Token::simpleMatch(tok->astParent(), ". release ( )")) {
                const Token* parent = ftok->astParent();
                bool hasParentReset = false;
                while (parent) {
                    if (Token::Match(parent->tokAt(-2), ". release|reset (") &&
                        parent->tokAt(-2)->astOperand1()->exprId() == tok->exprId()) {
                        hasParentReset = true;
                        break;
                    }
                    parent = parent->astParent();
                }
                if (hasParentReset)
                    continue;
                ValueFlow::Value v(0);
                v.setKnown();
                valueFlowForwardAssign(ftok, tok, std::move(vars), {std::move(v)}, false, tokenlist, errorLogger, settings);
            } else if (Token::simpleMatch(tok->astParent(), ". get ( )")) {
                ValueFlow::Value v = makeSymbolic(tok);
                setTokenValue(tok->astParent()->tokAt(2), std::move(v), settings);
            }
        } else if (Token::Match(tok->previous(), "%name%|> (|{") && astIsSmartPointer(tok) &&
                   astIsSmartPointer(tok->astOperand1())) {
            std::vector<const Token*> args = getArguments(tok);
            if (args.empty())
                continue;
            for (const ValueFlow::Value& v : args.front()->values())
                setTokenValue(tok, v, settings);
        }
    }
}

static Library::Container::Yield findIteratorYield(Token* tok, const Token*& ftok, const Settings& settings)
{
    auto yield = astContainerYield(tok, settings.library, &ftok);
    if (ftok)
        return yield;

    if (!tok->astParent())
        return yield;

    // begin/end free functions
    return astFunctionYield(tok->astParent()->previous(), settings, &ftok);
}

static void valueFlowIterators(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->scope())
            continue;
        if (!tok->scope()->isExecutable())
            continue;
        if (!astIsContainer(tok))
            continue;
        const Token* ftok = nullptr;
        const Library::Container::Yield yield = findIteratorYield(tok, ftok, settings);
        if (!ftok)
            continue;
        if (yield == Library::Container::Yield::START_ITERATOR) {
            ValueFlow::Value v(0);
            v.setKnown();
            v.valueType = ValueFlow::Value::ValueType::ITERATOR_START;
            setTokenValue(const_cast<Token*>(ftok)->next(), std::move(v), settings);
        } else if (yield == Library::Container::Yield::END_ITERATOR) {
            ValueFlow::Value v(0);
            v.setKnown();
            v.valueType = ValueFlow::Value::ValueType::ITERATOR_END;
            setTokenValue(const_cast<Token*>(ftok)->next(), std::move(v), settings);
        }
    }
}

static std::list<ValueFlow::Value> getIteratorValues(std::list<ValueFlow::Value> values,
                                                     const ValueFlow::Value::ValueKind* kind = nullptr)
{
    values.remove_if([&](const ValueFlow::Value& v) {
        if (kind && v.valueKind != *kind)
            return true;
        return !v.isIteratorValue();
    });
    return values;
}

struct IteratorConditionHandler : SimpleConditionHandler {
    std::vector<Condition> parse(const Token* tok, const Settings& /*settings*/) const override {
        Condition cond;

        if (Token::Match(tok, "==|!=")) {
            if (!tok->astOperand1() || !tok->astOperand2())
                return {};

            constexpr ValueFlow::Value::ValueKind kind = ValueFlow::Value::ValueKind::Known;
            std::list<ValueFlow::Value> values = getIteratorValues(tok->astOperand1()->values(), &kind);
            if (!values.empty()) {
                cond.vartok = tok->astOperand2();
            } else {
                values = getIteratorValues(tok->astOperand2()->values(), &kind);
                if (!values.empty())
                    cond.vartok = tok->astOperand1();
            }
            for (ValueFlow::Value& v:values) {
                v.setPossible();
                v.assumeCondition(tok);
            }
            cond.true_values = values;
            cond.false_values = std::move(values);
        }

        return {std::move(cond)};
    }
};

static void valueFlowIteratorInfer(TokenList& tokenlist, const Settings& settings)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (!tok->scope())
            continue;
        if (!tok->scope()->isExecutable())
            continue;
        std::list<ValueFlow::Value> values = getIteratorValues(tok->values());
        values.remove_if([&](const ValueFlow::Value& v) {
            if (!v.isImpossible())
                return true;
            if (!v.condition)
                return true;
            if (v.bound != ValueFlow::Value::Bound::Point)
                return true;
            if (v.isIteratorEndValue() && v.intvalue <= 0)
                return true;
            if (v.isIteratorStartValue() && v.intvalue >= 0)
                return true;
            return false;
        });
        for (ValueFlow::Value& v : values) {
            v.setPossible();
            if (v.isIteratorStartValue())
                v.intvalue++;
            if (v.isIteratorEndValue())
                v.intvalue--;
            setTokenValue(tok, std::move(v), settings);
        }
    }
}

static std::vector<ValueFlow::Value> getContainerValues(const Token* tok)
{
    std::vector<ValueFlow::Value> values;
    if (tok) {
        std::copy_if(tok->values().cbegin(),
                     tok->values().cend(),
                     std::back_inserter(values),
                     std::mem_fn(&ValueFlow::Value::isContainerSizeValue));
    }
    return values;
}

static ValueFlow::Value makeContainerSizeValue(MathLib::bigint s, bool known = true)
{
    ValueFlow::Value value(s);
    value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
    if (known)
        value.setKnown();
    return value;
}

static std::vector<ValueFlow::Value> makeContainerSizeValue(const Token* tok, bool known = true)
{
    if (const ValueFlow::Value* v = tok->getKnownValue(ValueFlow::Value::ValueType::INT))
        return {makeContainerSizeValue(v->intvalue, known)};
    return {};
}

static std::vector<ValueFlow::Value> getContainerSizeFromConstructorArgs(const std::vector<const Token*>& args,
                                                                         const Library::Container* container,
                                                                         bool known)
{
    if (astIsIntegral(args[0], false)) { // { count, i } or { count }
        if (args.size() == 1 || (args.size() > 1 && !astIsIntegral(args[1], false)))
            return {makeContainerSizeValue(args[0], known)};
    } else if (astIsContainer(args[0]) && args.size() == 1) { // copy constructor
        return getContainerValues(args[0]);
    } else if (isIteratorPair(args)) {
        std::vector<ValueFlow::Value> result = getContainerValues(args[0]);
        if (!result.empty())
            return result;
        // (ptr, ptr + size)
        if (astIsPointer(args[0]) && args[0]->exprId() != 0) {
            // (ptr, ptr) is empty
            // TODO: Use lifetime values to check if it points to the same address
            if (args[0]->exprId() == args[1]->exprId())
                return {makeContainerSizeValue(MathLib::bigint{0}, known)};
            // TODO: Insert iterator positions for pointers
            if (Token::simpleMatch(args[1], "+")) {
                nonneg int const eid = args[0]->exprId();
                const Token* vartok = args[1]->astOperand1();
                const Token* sizetok = args[1]->astOperand2();
                if (sizetok->exprId() == eid)
                    std::swap(vartok, sizetok);
                if (vartok->exprId() == eid && sizetok->hasKnownIntValue())
                    return {makeContainerSizeValue(sizetok, known)};
            }
        }
    } else if (container->stdStringLike) {
        if (astIsPointer(args[0])) {
            if (args.size() == 1 && args[0]->tokType() == Token::Type::eString)
                return {makeContainerSizeValue(Token::getStrLength(args[0]), known)};
            if (args.size() == 2 && astIsIntegral(args[1], false)) // { char*, count }
                return {makeContainerSizeValue(args[1], known)};
        } else if (astIsContainer(args[0])) {
            if (args.size() == 1) // copy constructor { str }
                return getContainerValues(args[0]);
            if (args.size() == 3) // { str, pos, count }
                return {makeContainerSizeValue(args[2], known)};
            // TODO: { str, pos }, { ..., alloc }
        }
    }
    return {};
}

static bool valueFlowIsSameContainerType(const ValueType& contType, const Token* tok, const Settings& settings)
{
    if (!tok || !tok->valueType() || !tok->valueType()->containerTypeToken)
        return true;

    const ValueType tokType = ValueType::parseDecl(tok->valueType()->containerTypeToken, settings);
    return contType.isTypeEqual(&tokType) || tokType.type == ValueType::Type::UNKNOWN_TYPE;
}

static std::vector<ValueFlow::Value> getInitListSize(const Token* tok,
                                                     const ValueType* valueType,
                                                     const Settings& settings,
                                                     bool known = true)
{
    std::vector<const Token*> args = getArguments(tok);
    if (args.empty())
        return {makeContainerSizeValue(MathLib::bigint{0}, known)};
    bool initList = tok->str() == "{";
    // Try to disambiguate init list from constructor
    if (initList && args.size() < 4) {
        initList = !isIteratorPair(args);
        const Token* containerTypeToken = valueType->containerTypeToken;
        if (valueType->container->stdStringLike) {
            initList = astIsGenericChar(args[0]) && !astIsPointer(args[0]);
        } else if (containerTypeToken) {
            ValueType vt = ValueType::parseDecl(containerTypeToken, settings);
            if (vt.pointer > 0 && astIsPointer(args[0]))
                initList = true;
            else if (vt.type == ValueType::ITERATOR && astIsIterator(args[0]))
                initList = true;
            else if (vt.isIntegral() && astIsIntegral(args[0], false))
                initList = true;
            else if (args.size() == 1 && valueFlowIsSameContainerType(vt, tok->astOperand2(), settings))
                initList = false; // copy ctor
            else if (args.size() == 2 && (!args[0]->valueType() || !args[1]->valueType())) // might be unknown iterators
                initList = false;
        }
    }
    if (!initList)
        return getContainerSizeFromConstructorArgs(args, valueType->container, known);
    return {makeContainerSizeValue(args.size(), known)};
}

static std::vector<ValueFlow::Value> getContainerSizeFromConstructor(const Token* tok,
                                                                     const ValueType* valueType,
                                                                     const Settings& settings,
                                                                     bool known = true)
{
    std::vector<const Token*> args = getArguments(tok);
    if (args.empty())
        return {makeContainerSizeValue(MathLib::bigint{0}, known)};
    // Init list in constructor
    if (args.size() == 1 && Token::simpleMatch(args[0], "{"))
        return getInitListSize(args[0], valueType, settings, known);
    return getContainerSizeFromConstructorArgs(args, valueType->container, known);
}

static void valueFlowContainerSetTokValue(const TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings, const Token* tok, Token* initList)
{
    ValueFlow::Value value;
    value.valueType = ValueFlow::Value::ValueType::TOK;
    value.tokvalue = initList;
    if (astIsContainerString(tok) && Token::simpleMatch(initList, "{") && Token::Match(initList->astOperand2(), "%str%")) {
        value.tokvalue = initList->astOperand2();
    }
    value.setKnown();
    Token* start = initList->link() ? initList->link() : initList->next();
    if (tok->variable() && tok->variable()->isConst()) {
        valueFlowForwardConst(start, tok->variable()->scope()->bodyEnd, tok->variable(), {std::move(value)}, settings);
    } else {
        valueFlowForward(start, tok, std::move(value), tokenlist, errorLogger, settings);
    }
}

static const Scope* getFunctionScope(const Scope* scope) {
    while (scope && scope->type != ScopeType::eFunction)
        scope = scope->nestedIn;
    return scope;
}

static void valueFlowContainerSize(const TokenList& tokenlist,
                                   const SymbolDatabase& symboldatabase,
                                   ErrorLogger& errorLogger,
                                   const Settings& settings,
                                   const std::set<const Scope*>& skippedFunctions)
{
    // declaration
    for (const Variable *var : symboldatabase.variableList()) {
        if (!var)
            continue;
        if (!var->scope() || !var->scope()->bodyEnd || !var->scope()->bodyStart)
            continue;
        if (!var->valueType() || !var->valueType()->container)
            continue;
        if (!astIsContainer(var->nameToken()))
            continue;
        if (skippedFunctions.count(getFunctionScope(var->scope())))
            continue;

        bool known = true;
        MathLib::bigint size = 0;
        const bool nonLocal = !var->isLocal() || var->isPointer() || var->isReference() || var->isStatic();
        bool constSize = var->isConst() && !nonLocal;
        bool staticSize = false;
        if (var->valueType()->container->size_templateArgNo >= 0) {
            staticSize = true;
            constSize = true;
            size = -1;
            if (var->dimensions().size() == 1) {
                const Dimension& dim = var->dimensions().front();
                if (dim.known) {
                    size = dim.num;
                } else if (dim.tok && dim.tok->hasKnownIntValue() && dim.tok->strAt(1) == ">") {
                    size = dim.tok->getKnownIntValue();
                }
            }
            if (size < 0)
                continue;
        }
        if (!staticSize && nonLocal)
            continue;
        auto* nameToken = const_cast<Token*>(var->nameToken());
        if (nameToken->hasKnownValue(ValueFlow::Value::ValueType::CONTAINER_SIZE))
            continue;
        if (!staticSize) {
            if (!Token::Match(nameToken, "%name% ;") &&
                !(Token::Match(nameToken, "%name% {") && Token::simpleMatch(nameToken->linkAt(1), "} ;")) &&
                !Token::Match(nameToken, "%name% ("))
                continue;
        }
        if (Token::Match(nameToken->astTop()->previous(), "for|while"))
            known = !isVariableChanged(var, settings);
        std::vector<ValueFlow::Value> values{ValueFlow::Value{size}};
        values.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
        if (known)
            values.back().setKnown();
        if (!staticSize) {
            if (Token::simpleMatch(nameToken->next(), "{")) {
                Token* initList = nameToken->next();
                valueFlowContainerSetTokValue(tokenlist, errorLogger, settings, nameToken, initList);
                values = getInitListSize(initList, var->valueType(), settings, known);
            } else if (Token::simpleMatch(nameToken->next(), "(")) {
                const Token* constructorArgs = nameToken->next();
                values = getContainerSizeFromConstructor(constructorArgs, var->valueType(), settings, known);
            }
        }

        if (constSize) {
            valueFlowForwardConst(nameToken->next(), var->scope()->bodyEnd, var, values, settings);
            continue;
        }

        for (const ValueFlow::Value& value : values) {
            valueFlowForward(nameToken->next(), var->nameToken(), value, tokenlist, errorLogger, settings);
        }
    }

    auto forwardMinimumContainerSize = [&](MathLib::bigint size, Token* opTok, const Token* exprTok) -> void {
        if (size == 0)
            return;

        ValueFlow::Value value(size - 1);
        value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
        value.bound = ValueFlow::Value::Bound::Upper;
        value.setImpossible();
        Token* next = nextAfterAstRightmostLeaf(opTok);
        if (!next)
            next = opTok->next();
        valueFlowForward(next, exprTok, std::move(value), tokenlist, errorLogger, settings);
    };

    // after assignment
    for (const Scope *functionScope : symboldatabase.functionScopes) {
        for (auto* tok = const_cast<Token*>(functionScope->bodyStart); tok != functionScope->bodyEnd; tok = tok->next()) {
            if (Token::Match(tok, "%name%|;|{|} %var% = %str% ;")) {
                Token* containerTok = tok->next();
                if (containerTok->exprId() == 0)
                    continue;
                if (containerTok->valueType() && containerTok->valueType()->container &&
                    containerTok->valueType()->container->stdStringLike) {
                    valueFlowContainerSetTokValue(tokenlist, errorLogger, settings, containerTok, containerTok->tokAt(2));
                    ValueFlow::Value value(Token::getStrLength(containerTok->tokAt(2)));
                    value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                    value.setKnown();
                    valueFlowForward(containerTok->next(), containerTok, std::move(value), tokenlist, errorLogger, settings);
                }
            } else if (Token::Match(tok->previous(), ">|return (|{") && astIsContainer(tok) && getLibraryContainer(tok)->size_templateArgNo < 0) {
                std::vector<ValueFlow::Value> values;
                if (Token::simpleMatch(tok, "{")) {
                    values = getInitListSize(tok, tok->valueType(), settings, true);
                    ValueFlow::Value value;
                    value.valueType = ValueFlow::Value::ValueType::TOK;
                    value.tokvalue = tok;
                    value.setKnown();
                    values.push_back(std::move(value));
                } else if (Token::simpleMatch(tok, "(")) {
                    const Token* constructorArgs = tok;
                    values = getContainerSizeFromConstructor(constructorArgs, tok->valueType(), settings, true);
                }
                for (const ValueFlow::Value& value : values)
                    setTokenValue(tok, value, settings);
            } else if (Token::Match(tok, ";|{|} %var% =") && Token::Match(tok->tokAt(2)->astOperand2(), "[({]") &&
                       // init list
                       ((tok->tokAt(2) == tok->tokAt(2)->astOperand2()->astParent() && !tok->tokAt(2)->astOperand2()->astOperand2() && tok->tokAt(2)->astOperand2()->str() == "{") ||
                        // constructor
                        (!Token::simpleMatch(tok->tokAt(2)->astOperand2()->astOperand1(), ".") && settings.library.detectContainer(tok->tokAt(3))))) {
                Token* containerTok = tok->next();
                if (containerTok->exprId() == 0)
                    continue;
                if (astIsContainer(containerTok) && containerTok->valueType()->container->size_templateArgNo < 0) {
                    Token* rhs = tok->tokAt(2)->astOperand2();
                    std::vector<ValueFlow::Value> values = getInitListSize(rhs, containerTok->valueType(), settings);
                    valueFlowContainerSetTokValue(tokenlist, errorLogger, settings, containerTok, rhs);
                    for (const ValueFlow::Value& value : values)
                        valueFlowForward(containerTok->next(), containerTok, value, tokenlist, errorLogger, settings);
                }
            } else if (Token::Match(tok, ". %name% (") && tok->astOperand1() && tok->astOperand1()->valueType() &&
                       tok->astOperand1()->valueType()->container) {
                const Token* containerTok = tok->astOperand1();
                if (containerTok->exprId() == 0)
                    continue;
                if (containerTok->variable() && containerTok->variable()->isArray())
                    continue;
                const Library::Container::Action action = containerTok->valueType()->container->getAction(tok->strAt(1));
                if (action == Library::Container::Action::CLEAR) {
                    ValueFlow::Value value(0);
                    value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                    value.setKnown();
                    valueFlowForward(tok->next(), containerTok, std::move(value), tokenlist, errorLogger, settings);
                } else if (action == Library::Container::Action::RESIZE && tok->tokAt(2)->astOperand2() &&
                           tok->tokAt(2)->astOperand2()->hasKnownIntValue()) {
                    ValueFlow::Value value(*tok->tokAt(2)->astOperand2()->getKnownValue(ValueFlow::Value::ValueType::INT));
                    value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                    value.setKnown();
                    valueFlowForward(tok->linkAt(2), containerTok, std::move(value), tokenlist, errorLogger, settings);
                } else if (action == Library::Container::Action::PUSH && !isIteratorPair(getArguments(tok->tokAt(2)))) {
                    ValueFlow::Value value(0);
                    value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                    value.setImpossible();
                    valueFlowForward(tok->linkAt(2), containerTok, std::move(value), tokenlist, errorLogger, settings);
                }
                // TODO: handle more actions?

            } else if (tok->str() == "+=" && astIsContainer(tok->astOperand1())) {
                const Token* containerTok = tok->astOperand1();
                const Token* valueTok = tok->astOperand2();
                const MathLib::bigint size = ValueFlow::valueFlowGetStrLength(valueTok);
                forwardMinimumContainerSize(size, tok, containerTok);

            } else if (tok->str() == "=" && Token::simpleMatch(tok->astOperand2(), "+") && astIsContainerString(tok)) {
                const Token* tok2 = tok->astOperand2();
                MathLib::bigint size = 0;
                while (Token::simpleMatch(tok2, "+") && tok2->astOperand2()) {
                    size += ValueFlow::valueFlowGetStrLength(tok2->astOperand2());
                    tok2 = tok2->astOperand1();
                }
                size += ValueFlow::valueFlowGetStrLength(tok2);
                forwardMinimumContainerSize(size, tok, tok->astOperand1());
            }
        }
    }
}

struct ContainerConditionHandler : ConditionHandler {
    std::vector<Condition> parse(const Token* tok, const Settings& settings) const override
    {
        std::vector<Condition> conds;
        parseCompareEachInt(tok, [&](const Token* vartok, ValueFlow::Value true_value, ValueFlow::Value false_value) {
            vartok = settings.library.getContainerFromYield(vartok, Library::Container::Yield::SIZE);
            if (!vartok)
                return;
            true_value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
            false_value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
            Condition cond;
            cond.true_values.push_back(std::move(true_value));
            cond.false_values.push_back(std::move(false_value));
            cond.vartok = vartok;
            conds.push_back(std::move(cond));
        });
        if (!conds.empty())
            return conds;

        const Token* vartok = nullptr;

        // Empty check
        if (tok->str() == "(") {
            vartok = settings.library.getContainerFromYield(tok, Library::Container::Yield::EMPTY);
            // TODO: Handle .size()
            if (!vartok)
                return {};
            const Token *parent = tok->astParent();
            while (parent) {
                if (Token::Match(parent, "%comp%"))
                    return {};
                parent = parent->astParent();
            }
            ValueFlow::Value value(tok, 0LL);
            value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
            Condition cond;
            cond.true_values.emplace_back(value);
            cond.false_values.emplace_back(std::move(value));
            cond.vartok = vartok;
            cond.inverted = true;
            return {std::move(cond)};
        }
        // String compare
        if (Token::Match(tok, "==|!=")) {
            const Token *strtok = nullptr;
            if (Token::Match(tok->astOperand1(), "%str%")) {
                strtok = tok->astOperand1();
                vartok = tok->astOperand2();
            } else if (Token::Match(tok->astOperand2(), "%str%")) {
                strtok = tok->astOperand2();
                vartok = tok->astOperand1();
            }
            if (!strtok)
                return {};
            if (!astIsContainer(vartok))
                return {};
            ValueFlow::Value value(tok, Token::getStrLength(strtok));
            value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
            Condition cond;
            cond.false_values.emplace_back(value);
            cond.true_values.emplace_back(std::move(value));
            cond.vartok = vartok;
            cond.impossible = false;
            return {std::move(cond)};
        }
        return {};
    }
};

static void valueFlowDynamicBufferSize(const TokenList& tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger& errorLogger, const Settings& settings)
{
    auto getBufferSizeFromAllocFunc = [&](const Token* funcTok) -> MathLib::bigint {
        MathLib::bigint sizeValue = -1;
        const Library::AllocFunc* allocFunc = settings.library.getAllocFuncInfo(funcTok);
        if (!allocFunc)
            allocFunc = settings.library.getReallocFuncInfo(funcTok);
        if (!allocFunc || allocFunc->bufferSize == Library::AllocFunc::BufferSize::none)
            return sizeValue;

        const std::vector<const Token*> args = getArguments(funcTok);

        const Token* const arg1 = (args.size() >= allocFunc->bufferSizeArg1) ? args[allocFunc->bufferSizeArg1 - 1] : nullptr;
        const Token* const arg2 = (args.size() >= allocFunc->bufferSizeArg2) ? args[allocFunc->bufferSizeArg2 - 1] : nullptr;

        switch (allocFunc->bufferSize) {
        case Library::AllocFunc::BufferSize::none:
            break;
        case Library::AllocFunc::BufferSize::malloc:
            if (arg1 && arg1->hasKnownIntValue())
                sizeValue = arg1->getKnownIntValue();
            break;
        case Library::AllocFunc::BufferSize::calloc:
            if (arg1 && arg2 && arg1->hasKnownIntValue() && arg2->hasKnownIntValue())
                sizeValue = arg1->getKnownIntValue() * arg2->getKnownIntValue();
            break;
        case Library::AllocFunc::BufferSize::strdup:
            if (arg1) {
                if (const ValueFlow::Value* value = arg1->getKnownValue(ValueFlow::Value::ValueType::TOK))
                {
                    if (value->tokvalue->tokType() == Token::eString)
                        sizeValue = Token::getStrLength(value->tokvalue) + 1; // Add one for the null terminator
                }
            }
            break;
        }
        return sizeValue;
    };

    auto getBufferSizeFromNew = [&](const Token* newTok) -> MathLib::bigint {
        MathLib::bigint sizeValue = -1, numElem = -1;

        if (newTok && newTok->astOperand1()) { // number of elements
            const Token* bracTok = nullptr, *typeTok = nullptr;
            if (newTok->astOperand1()->str() == "[")
                bracTok = newTok->astOperand1();
            else if (Token::Match(newTok->astOperand1(), "(|{")) {
                if (newTok->astOperand1()->astOperand1() && newTok->astOperand1()->astOperand1()->str() == "[")
                    bracTok = newTok->astOperand1()->astOperand1();
                else
                    typeTok = newTok->astOperand1()->astOperand1();
            }
            else
                typeTok = newTok->astOperand1();
            if (bracTok && bracTok->astOperand2() && bracTok->astOperand2()->hasKnownIntValue())
                numElem = bracTok->astOperand2()->getKnownIntValue();
            else if (Token::Match(typeTok, "%type%"))
                numElem = 1;
        }

        if (numElem >= 0 && newTok->astParent() && newTok->astParent()->isAssignmentOp()) { // size of the allocated type
            const Token* typeTok = newTok->astParent()->astOperand1(); // TODO: implement fallback for e.g. "auto p = new Type;"
            if (!typeTok || !typeTok->varId())
                typeTok = newTok->astParent()->previous(); // hack for "int** z = ..."
            if (typeTok && typeTok->valueType()) {
                const MathLib::bigint typeSize = typeTok->valueType()->typeSize(settings.platform, typeTok->valueType()->pointer > 1);
                if (typeSize >= 0)
                    sizeValue = numElem * typeSize;
            }
        }
        return sizeValue;
    };

    for (const Scope *functionScope : symboldatabase.functionScopes) {
        for (const Token *tok = functionScope->bodyStart; tok != functionScope->bodyEnd; tok = tok->next()) {
            if (!Token::Match(tok, "[;{}] %var% ="))
                continue;

            if (!tok->next()->variable())
                continue;

            const Token *rhs = tok->tokAt(2)->astOperand2();
            while (rhs && rhs->isCast())
                rhs = rhs->astOperand2() ? rhs->astOperand2() : rhs->astOperand1();
            if (!rhs)
                continue;

            const bool isNew = rhs->isCpp() && rhs->str() == "new";
            if (!isNew && !Token::Match(rhs->previous(), "%name% ("))
                continue;

            const MathLib::bigint sizeValue = isNew ? getBufferSizeFromNew(rhs) : getBufferSizeFromAllocFunc(rhs->previous());
            if (sizeValue < 0)
                continue;

            ValueFlow::Value value(sizeValue);
            value.errorPath.emplace_back(tok->tokAt(2), "Assign " + tok->strAt(1) + ", buffer with size " + MathLib::toString(sizeValue));
            value.valueType = ValueFlow::Value::ValueType::BUFFER_SIZE;
            value.setKnown();
            valueFlowForward(const_cast<Token*>(rhs), functionScope->bodyEnd, tok->next(), std::move(value), tokenlist, errorLogger, settings);
        }
    }
}

static bool getMinMaxValues(const std::string& typestr,
                            const Settings& settings,
                            bool cpp,
                            MathLib::bigint& minvalue,
                            MathLib::bigint& maxvalue)
{
    TokenList typeTokens(settings, cpp ? Standards::Language::CPP : Standards::Language::C);
    std::istringstream istr(typestr + ";");
    if (!typeTokens.createTokens(istr))
        return false;
    typeTokens.simplifyPlatformTypes();
    typeTokens.simplifyStdType();
    const ValueType& vt = ValueType::parseDecl(typeTokens.front(), settings);
    return ValueFlow::getMinMaxValues(&vt, settings.platform, minvalue, maxvalue);
}

static void valueFlowSafeFunctions(const TokenList& tokenlist, const SymbolDatabase& symboldatabase, ErrorLogger& errorLogger, const Settings& settings)
{
    for (const Scope *functionScope : symboldatabase.functionScopes) {
        if (!functionScope->bodyStart)
            continue;
        const Function *function = functionScope->function;
        if (!function)
            continue;

        const bool safe = function->isSafe(settings);
        const bool all = safe && settings.platform.type != Platform::Type::Unspecified;

        for (const Variable &arg : function->argumentList) {
            if (!arg.nameToken() || !arg.valueType())
                continue;

            if (arg.valueType()->type == ValueType::Type::CONTAINER) {
                if (!safe)
                    continue;
                std::list<ValueFlow::Value> argValues;
                argValues.emplace_back(0);
                argValues.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                argValues.back().errorPath.emplace_back(arg.nameToken(), "Assuming " + arg.name() + " is empty");
                argValues.back().safe = true;
                argValues.emplace_back(1000000);
                argValues.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
                argValues.back().errorPath.emplace_back(arg.nameToken(), "Assuming " + arg.name() + " size is 1000000");
                argValues.back().safe = true;
                for (const ValueFlow::Value &value : argValues)
                    valueFlowForward(const_cast<Token*>(functionScope->bodyStart), arg.nameToken(), value, tokenlist, errorLogger, settings);
                continue;
            }

            MathLib::bigint low, high;
            bool isLow = arg.nameToken()->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::LOW, low);
            bool isHigh = arg.nameToken()->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::HIGH, high);

            if (!isLow && !isHigh && !all)
                continue;

            const bool safeLow = !isLow;
            const bool safeHigh = !isHigh;

            if ((!isLow || !isHigh) && all) {
                MathLib::bigint minValue, maxValue;
                if (ValueFlow::getMinMaxValues(arg.valueType(), settings.platform, minValue, maxValue)) {
                    if (!isLow)
                        low = minValue;
                    if (!isHigh)
                        high = maxValue;
                    isLow = isHigh = true;
                } else if (arg.valueType()->type == ValueType::Type::FLOAT || arg.valueType()->type == ValueType::Type::DOUBLE || arg.valueType()->type == ValueType::Type::LONGDOUBLE) {
                    std::list<ValueFlow::Value> argValues;
                    argValues.emplace_back(0);
                    argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
                    argValues.back().floatValue = isLow ? static_cast<double>(low) : -1E25;
                    argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
                    argValues.back().safe = true;
                    argValues.emplace_back(0);
                    argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
                    argValues.back().floatValue = isHigh ? static_cast<double>(high) : 1E25;
                    argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
                    argValues.back().safe = true;
                    valueFlowForward(const_cast<Token*>(functionScope->bodyStart->next()),
                                     functionScope->bodyEnd,
                                     arg.nameToken(),
                                     std::move(argValues),
                                     tokenlist,
                                     errorLogger,
                                     settings);
                    continue;
                }
            }

            std::list<ValueFlow::Value> argValues;
            if (isLow) {
                argValues.emplace_back(low);
                argValues.back().errorPath.emplace_back(arg.nameToken(), std::string(safeLow ? "Safe checks: " : "") + "Assuming argument has value " + MathLib::toString(low));
                argValues.back().safe = safeLow;
            }
            if (isHigh) {
                argValues.emplace_back(high);
                argValues.back().errorPath.emplace_back(arg.nameToken(), std::string(safeHigh ? "Safe checks: " : "") + "Assuming argument has value " + MathLib::toString(high));
                argValues.back().safe = safeHigh;
            }

            if (!argValues.empty())
                valueFlowForward(const_cast<Token*>(functionScope->bodyStart->next()),
                                 functionScope->bodyEnd,
                                 arg.nameToken(),
                                 std::move(argValues),
                                 tokenlist,
                                 errorLogger,
                                 settings);
        }
    }
}

static void valueFlowUnknownFunctionReturn(TokenList& tokenlist, const Settings& settings)
{
    if (!tokenlist.front())
        return;
    for (Token* tok = tokenlist.front()->next(); tok; tok = tok->next()) {
        if (!tok->astParent() || tok->str() != "(" || !tok->previous()->isName())
            continue;

        if (const auto* f = settings.library.getAllocFuncInfo(tok->astOperand1())) {
            if (f->noFail) {
                // Allocation function that cannot fail
            } else if (settings.library.returnValueType(tok->astOperand1()).find('*') != std::string::npos) {
                // Allocation function that returns a pointer
                ValueFlow::Value value(0);
                value.setPossible();
                value.errorPath.emplace_back(tok, "Assuming allocation function fails");
                if (Library::ismemory(f->groupId))
                    value.unknownFunctionReturn = ValueFlow::Value::UnknownFunctionReturn::outOfMemory;
                else
                    value.unknownFunctionReturn = ValueFlow::Value::UnknownFunctionReturn::outOfResources;
                setTokenValue(tok, std::move(value), settings);
                continue;
            }
        }

        if (settings.checkUnknownFunctionReturn.find(tok->strAt(-1)) == settings.checkUnknownFunctionReturn.end())
            continue;
        std::vector<MathLib::bigint> unknownValues = settings.library.unknownReturnValues(tok->astOperand1());
        if (unknownValues.empty())
            continue;

        // Get min/max values for return type
        const std::string& typestr = settings.library.returnValueType(tok->previous());
        MathLib::bigint minvalue, maxvalue;
        if (!getMinMaxValues(typestr, settings, tok->isCpp(), minvalue, maxvalue))
            continue;

        for (MathLib::bigint value : unknownValues) {
            if (value < minvalue)
                value = minvalue;
            else if (value > maxvalue)
                value = maxvalue;
            setTokenValue(tok, ValueFlow::Value(value), settings);
        }
    }
}

static void valueFlowDebug(TokenList& tokenlist, ErrorLogger& errorLogger, const Settings& settings)
{
    if (!settings.debugnormal && !settings.debugwarnings)
        return;
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->getTokenDebug() != TokenDebug::ValueFlow)
            continue;
        if (tok->astParent() && tok->astParent()->getTokenDebug() == TokenDebug::ValueFlow)
            continue;
        for (const ValueFlow::Value& v : tok->values()) {
            std::string msg = "The value is " + debugString(v);
            ErrorPath errorPath = v.errorPath;
            errorPath.insert(errorPath.end(), v.debugPath.cbegin(), v.debugPath.cend());
            errorPath.emplace_back(tok, "");
            errorLogger.reportErr({errorPath, &tokenlist, Severity::debug, "valueFlow", msg, CWE{0}, Certainty::normal});
        }
    }
}

const ValueFlow::Value *ValueFlow::valueFlowConstantFoldAST(Token *expr, const Settings &settings)
{
    if (expr && expr->values().empty()) {
        valueFlowConstantFoldAST(expr->astOperand1(), settings);
        valueFlowConstantFoldAST(expr->astOperand2(), settings);
        valueFlowSetConstantValue(expr, settings);
    }
    const auto* v = expr && expr->hasKnownValue() ? &expr->values().front() : nullptr;
    if (v)
        assert(v->isKnown());
    return v;
}

struct ValueFlowState {
    explicit ValueFlowState(TokenList& tokenlist,
                            SymbolDatabase& symboldatabase,
                            ErrorLogger& errorLogger,
                            const Settings& settings)
        : tokenlist(tokenlist), symboldatabase(symboldatabase), errorLogger(errorLogger), settings(settings)
    {}

    TokenList& tokenlist;
    SymbolDatabase& symboldatabase;
    ErrorLogger& errorLogger;
    const Settings& settings;
    std::set<const Scope*> skippedFunctions;
};

struct ValueFlowPass {
    ValueFlowPass() = default;
    ValueFlowPass(const ValueFlowPass&) = default;
    // Name of pass
    virtual const char* name() const = 0;
    // Run the pass
    virtual void run(const ValueFlowState& state) const = 0;
    // Returns true if pass needs C++
    virtual bool cpp() const = 0;
    virtual ~ValueFlowPass() noexcept = default;
};

struct ValueFlowPassRunner {
    using Clock = std::chrono::steady_clock;
    using TimePoint = std::chrono::time_point<Clock>;
    explicit ValueFlowPassRunner(ValueFlowState state, TimerResultsIntf* timerResults = nullptr)
        : state(std::move(state)), stop(TimePoint::max()), timerResults(timerResults)
    {
        setSkippedFunctions();
        setStopTime();
    }

    bool run_once(std::initializer_list<ValuePtr<ValueFlowPass>> passes) const
    {
        return std::any_of(passes.begin(), passes.end(), [&](const ValuePtr<ValueFlowPass>& pass) {
            return run(pass);
        });
    }

    bool run(std::initializer_list<ValuePtr<ValueFlowPass>> passes) const
    {
        std::size_t values = 0;
        std::size_t n = state.settings.vfOptions.maxIterations;
        while (n > 0 && values != getTotalValues()) {
            values = getTotalValues();
            if (std::any_of(passes.begin(), passes.end(), [&](const ValuePtr<ValueFlowPass>& pass) {
                return run(pass);
            }))
                return true;
            --n;
        }
        if (state.settings.debugwarnings) {
            if (n == 0 && values != getTotalValues()) {
                ErrorMessage::FileLocation loc(state.tokenlist.getFiles()[0], 0, 0);
                ErrorMessage errmsg({std::move(loc)},
                                    "",
                                    Severity::debug,
                                    "ValueFlow maximum iterations exceeded",
                                    "valueFlowMaxIterations",
                                    Certainty::normal);
                state.errorLogger.reportErr(errmsg);
            }
        }
        return false;
    }

    bool run(const ValuePtr<ValueFlowPass>& pass) const
    {
        auto start = Clock::now();
        if (start > stop) {
            // TODO: add bailout message
            return true;
        }
        if (!state.tokenlist.isCPP() && pass->cpp())
            return false;
        if (timerResults) {
            Timer t(pass->name(), state.settings.showtime, timerResults);
            pass->run(state);
        } else {
            pass->run(state);
        }
        return false;
    }

    std::size_t getTotalValues() const
    {
        std::size_t n = 1;
        for (Token* tok = state.tokenlist.front(); tok; tok = tok->next())
            n += tok->values().size();
        return n;
    }

    void setSkippedFunctions()
    {
        if (state.settings.vfOptions.maxIfCount > 0) {
            for (const Scope* functionScope : state.symboldatabase.functionScopes) {
                int countIfScopes = 0;
                std::vector<const Scope*> scopes{functionScope};
                while (!scopes.empty()) {
                    const Scope* s = scopes.back();
                    scopes.pop_back();
                    for (const Scope* s2 : s->nestedList) {
                        scopes.emplace_back(s2);
                        if (s2->type == ScopeType::eIf)
                            ++countIfScopes;
                    }
                }
                if (countIfScopes > state.settings.vfOptions.maxIfCount) {
                    state.skippedFunctions.emplace(functionScope);

                    if (state.settings.severity.isEnabled(Severity::information)) {
                        const std::string& functionName = functionScope->className;
                        std::list<ErrorMessage::FileLocation> callstack(
                            1,
                            ErrorMessage::FileLocation(functionScope->bodyStart, &state.tokenlist));
                        const ErrorMessage errmsg(std::move(callstack),
                                                  state.tokenlist.getSourceFilePath(),
                                                  Severity::information,
                                                  "Limiting ValueFlow analysis in function '" + functionName + "' since it is too complex. "
                                                  "Please specify --check-level=exhaustive to perform full analysis.",
                                                  "checkLevelNormal", // TODO: use more specific ID
                                                  Certainty::normal);
                        state.errorLogger.reportErr(errmsg);
                    }
                }
            }
        }
    }

    void setStopTime()
    {
        if (state.settings.vfOptions.maxTime >= 0)
            stop = Clock::now() + std::chrono::seconds{state.settings.vfOptions.maxTime};
    }

    ValueFlowState state;
    TimePoint stop;
    TimerResultsIntf* timerResults;
};

template<class F>
struct ValueFlowPassAdaptor : ValueFlowPass {
    const char* mName = nullptr;
    bool mCPP = false;
    F mRun;
    ValueFlowPassAdaptor(const char* pname, bool pcpp, F prun) : ValueFlowPass(), mName(pname), mCPP(pcpp), mRun(prun) {}
    const char* name() const override {
        return mName;
    }
    void run(const ValueFlowState& state) const override
    {
        mRun(state.tokenlist, state.symboldatabase, state.errorLogger, state.settings, state.skippedFunctions);
    }
    bool cpp() const override {
        return mCPP;
    }
};

template<class F>
static ValueFlowPassAdaptor<F> makeValueFlowPassAdaptor(const char* name, bool cpp, F run)
{
    return {name, cpp, run};
}

#define VALUEFLOW_ADAPTOR(cpp, ...)                                                                                    \
    makeValueFlowPassAdaptor(#__VA_ARGS__,                                                                             \
                             (cpp),                                                                                      \
                             [](TokenList& tokenlist,                                                                  \
                                SymbolDatabase& symboldatabase,                                                        \
                                ErrorLogger& errorLogger,                                                              \
                                const Settings& settings,                                                              \
                                const std::set<const Scope*>& skippedFunctions) {                                      \
        (void)tokenlist;                                                                      \
        (void)symboldatabase;                                                                 \
        (void)errorLogger;                                                                    \
        (void)settings;                                                                       \
        (void)skippedFunctions;                                                               \
        __VA_ARGS__;                                                                          \
    })

#define VFA(...) VALUEFLOW_ADAPTOR(false, __VA_ARGS__)
#define VFA_CPP(...) VALUEFLOW_ADAPTOR(true, __VA_ARGS__)

void ValueFlow::setValues(TokenList& tokenlist,
                          SymbolDatabase& symboldatabase,
                          ErrorLogger& errorLogger,
                          const Settings& settings,
                          TimerResultsIntf* timerResults)
{
    for (Token* tok = tokenlist.front(); tok; tok = tok->next())
        tok->clearValueFlow();

    // commas in init..
    for (Token* tok = tokenlist.front(); tok; tok = tok->next()) {
        if (tok->str() != "{" || !tok->astOperand1())
            continue;
        for (Token* tok2 = tok->next(); tok2 != tok->link(); tok2 = tok2->next()) {
            if (tok2->link() && Token::Match(tok2, "[{[(<]"))
                tok2 = tok2->link();
            else if (tok2->str() == ",")
                tok2->isInitComma(true);
        }
    }

    ValueFlowPassRunner runner{ValueFlowState{tokenlist, symboldatabase, errorLogger, settings}, timerResults};
    runner.run_once({
        VFA(valueFlowEnumValue(symboldatabase, settings)),
        VFA(valueFlowNumber(tokenlist, settings)),
        VFA(valueFlowString(tokenlist, settings)),
        VFA(valueFlowTypeTraits(tokenlist, settings)),
        VFA(valueFlowArray(tokenlist, settings)),
        VFA(valueFlowUnknownFunctionReturn(tokenlist, settings)),
        VFA(valueFlowGlobalConstVar(tokenlist, settings)),
        VFA(valueFlowEnumValue(symboldatabase, settings)),
        VFA(valueFlowGlobalStaticVar(tokenlist, settings)),
        VFA(valueFlowPointerAlias(tokenlist, settings)),
        VFA(valueFlowLifetime(tokenlist, errorLogger, settings)),
        VFA(valueFlowSymbolic(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowBitAnd(tokenlist, settings)),
        VFA(valueFlowSameExpressions(tokenlist, settings)),
        VFA(valueFlowConditionExpressions(tokenlist, symboldatabase, errorLogger, settings)),
    });

    runner.run({
        VFA(valueFlowImpossibleValues(tokenlist, settings)),
        VFA(valueFlowSymbolicOperators(symboldatabase, settings)),
        VFA(valueFlowCondition(SymbolicConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA(valueFlowSymbolicInfer(symboldatabase, settings)),
        VFA(valueFlowArrayBool(tokenlist, settings)),
        VFA(valueFlowArrayElement(tokenlist, settings)),
        VFA(valueFlowRightShift(tokenlist, settings)),
        VFA_CPP(
            valueFlowCondition(ContainerConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA(valueFlowAfterAssign(tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA_CPP(valueFlowAfterSwap(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowCondition(SimpleConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA(valueFlowInferCondition(tokenlist, settings)),
        VFA(valueFlowSwitchVariable(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowForLoop(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowSubFunction(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowFunctionReturn(tokenlist, errorLogger, settings)),
        VFA(valueFlowLifetime(tokenlist, errorLogger, settings)),
        VFA(valueFlowFunctionDefaultParameter(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowUninit(tokenlist, errorLogger, settings)),
        VFA_CPP(valueFlowAfterMove(tokenlist, symboldatabase, errorLogger, settings)),
        VFA_CPP(valueFlowSmartPointer(tokenlist, errorLogger, settings)),
        VFA_CPP(valueFlowIterators(tokenlist, settings)),
        VFA_CPP(
            valueFlowCondition(IteratorConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA_CPP(valueFlowIteratorInfer(tokenlist, settings)),
        VFA_CPP(valueFlowContainerSize(tokenlist, symboldatabase, errorLogger, settings, skippedFunctions)),
        VFA(valueFlowSafeFunctions(tokenlist, symboldatabase, errorLogger, settings)),
    });

    runner.run_once({
        VFA(valueFlowDynamicBufferSize(tokenlist, symboldatabase, errorLogger, settings)),
        VFA(valueFlowDebug(tokenlist, errorLogger, settings)), // TODO: add option to print it after each step/iteration
    });
}

std::string ValueFlow::eitherTheConditionIsRedundant(const Token *condition)
{
    if (!condition)
        return "Either the condition is redundant";
    if (condition->str() == "case") {
        std::string expr;
        for (const Token *tok = condition; tok && tok->str() != ":"; tok = tok->next()) {
            expr += tok->str();
            if (Token::Match(tok, "%name%|%num% %name%|%num%"))
                expr += ' ';
        }
        return "Either the switch case '" + expr + "' is redundant";
    }
    return "Either the condition '" + condition->expressionString() + "' is redundant";
}

const ValueFlow::Value* ValueFlow::findValue(const std::list<ValueFlow::Value>& values,
                                             const Settings& settings,
                                             const std::function<bool(const ValueFlow::Value&)> &pred)
{
    const ValueFlow::Value* ret = nullptr;
    for (const ValueFlow::Value& v : values) {
        if (pred(v)) {
            if (!ret || ret->isInconclusive() || (ret->condition && !v.isInconclusive()))
                ret = &v;
            if (!ret->isInconclusive() && !ret->condition)
                break;
        }
    }
    if (ret) {
        if (ret->isInconclusive() && !settings.certainty.isEnabled(Certainty::inconclusive))
            return nullptr;
        if (ret->condition && !settings.severity.isEnabled(Severity::warning))
            return nullptr;
    }
    return ret;
}

// TODO: returns a single value at most - no need for std::vector
static std::vector<ValueFlow::Value> isOutOfBoundsImpl(const ValueFlow::Value& size,
                                                       const Token* indexTok,
                                                       bool condition)
{
    if (!indexTok)
        return {};
    const ValueFlow::Value* indexValue = indexTok->getMaxValue(condition, size.path);
    if (!indexValue)
        return {};
    if (indexValue->intvalue >= size.intvalue)
        return {*indexValue};
    if (!condition)
        return {};
    // TODO: Use a better way to decide if the variable in unconstrained
    if (!indexTok->variable() || !indexTok->variable()->isArgument())
        return {};
    if (std::any_of(indexTok->values().cbegin(), indexTok->values().cend(), [&](const ValueFlow::Value& v) {
        return v.isSymbolicValue() && v.isPossible() && v.bound == ValueFlow::Value::Bound::Upper;
    }))
        return {};
    if (indexValue->bound != ValueFlow::Value::Bound::Lower)
        return {};
    if (size.bound == ValueFlow::Value::Bound::Lower)
        return {};
    // Checking for underflow doesn't mean it could be out of bounds
    if (indexValue->intvalue == 0)
        return {};
    ValueFlow::Value value = inferCondition(">=", indexTok, indexValue->intvalue);
    if (!value.isKnown())
        return {};
    if (value.intvalue == 0)
        return {};
    value.intvalue = size.intvalue;
    value.bound = ValueFlow::Value::Bound::Lower;
    return {std::move(value)};
}

// TODO: return single value at most - no need for std::vector
std::vector<ValueFlow::Value> ValueFlow::isOutOfBounds(const Value& size, const Token* indexTok, bool possible)
{
    ValueFlow::Value inBoundsValue = inferCondition("<", indexTok, size.intvalue);
    if (inBoundsValue.isKnown() && inBoundsValue.intvalue != 0)
        return {};
    std::vector<ValueFlow::Value> result = isOutOfBoundsImpl(size, indexTok, false);
    if (!result.empty())
        return result;
    if (!possible)
        return result;
    return isOutOfBoundsImpl(size, indexTok, true);
}