perf(bench): exclude resolution fixtures from incremental-benchmark sweep

scripts/incremental-benchmark.ts

@@ -181,6 +181,15 @@ const PROBE_FILE = path.join(root, 'src', 'domain', 'queries.ts');
 // CI-amplified false regressions on sub-30ms metrics like No-op rebuild.
 const WARMUP_RUNS = 2;
 
+// Resolution-benchmark fixtures live under the repo root and get pulled into
+// every self-build sweep. They are hand-annotated test corpora — not real
+// codegraph code — and a single heavy grammar (e.g. tree-sitter-verilog) can
+// add hundreds of milliseconds to fullBuildMs purely from fixture parsing
+// (#1112). Exclude them so adding native support for a new language doesn't
+// silently inflate the incremental-benchmark numbers.
+const BENCH_EXCLUDE = ['tests/benchmarks/resolution/fixtures/**'];
+const BUILD_OPTS = { engine, exclude: BENCH_EXCLUDE };
+
 function median(arr) {
 	const sorted = [...arr].sort((a, b) => a - b);
 	const mid = Math.floor(sorted.length / 2);
@@ -194,7 +203,7 @@ const fullTimings = [];
 for (let i = 0; i < RUNS; i++) {
 	if (fs.existsSync(dbPath)) fs.unlinkSync(dbPath);
 	const start = performance.now();
-	await buildGraph(root, { engine, incremental: false });
+	await buildGraph(root, { ...BUILD_OPTS, incremental: false });
 	fullTimings.push(performance.now() - start);
 }
 const fullBuildMs = Math.round(median(fullTimings));
@@ -203,12 +212,12 @@ const fullBuildMs = Math.round(median(fullTimings));
 let noopRebuildMs = null;
 try {
 	for (let i = 0; i < WARMUP_RUNS; i++) {
-		await buildGraph(root, { engine, incremental: true });
+		await buildGraph(root, { ...BUILD_OPTS, incremental: true });
 	}
 	const noopTimings = [];
 	for (let i = 0; i < RUNS; i++) {
 		const start = performance.now();
-		await buildGraph(root, { engine, incremental: true });
+		await buildGraph(root, { ...BUILD_OPTS, incremental: true });
 		noopTimings.push(performance.now() - start);
 	}
 	noopRebuildMs = Math.round(median(noopTimings));
@@ -223,13 +232,13 @@ let oneFilePhases = null;
 try {
 	for (let i = 0; i < WARMUP_RUNS; i++) {
 		fs.writeFileSync(PROBE_FILE, original + `\n// warmup-${i}\n`);
-		await buildGraph(root, { engine, incremental: true });
+		await buildGraph(root, { ...BUILD_OPTS, incremental: true });
 	}
 	const oneFileRuns = [];
 	for (let i = 0; i < RUNS; i++) {
 		fs.writeFileSync(PROBE_FILE, original + `\n// probe-${i}\n`);
 		const start = performance.now();
-		const res = await buildGraph(root, { engine, incremental: true });
+		const res = await buildGraph(root, { ...BUILD_OPTS, incremental: true });
 		oneFileRuns.push({ ms: performance.now() - start, phases: res?.phases || null });
 	}
 	oneFileRuns.sort((a, b) => a.ms - b.ms);
@@ -241,7 +250,7 @@ try {
 } finally {
 	fs.writeFileSync(PROBE_FILE, original);
 	try {
-		await buildGraph(root, { engine, incremental: true });
+		await buildGraph(root, { ...BUILD_OPTS, incremental: true });
 	} catch {
 		// Cleanup rebuild failed — probe file is already restored, move on
 	}

src/domain/graph/builder/pipeline.ts

@@ -185,6 +185,9 @@ function setupPipeline(ctx: PipelineContext): void {
   initSchema(ctx.db);
 
   ctx.config = loadConfig(ctx.rootDir);
+  if (ctx.opts.exclude && ctx.opts.exclude.length > 0) {
+    ctx.config = { ...ctx.config, exclude: [...ctx.config.exclude, ...ctx.opts.exclude] };
+  }
   ctx.incremental =
     ctx.opts.incremental !== false && ctx.config.build && ctx.config.build.incremental !== false;
 

src/types.ts

@@ -1064,6 +1064,12 @@ export interface BuildGraphOpts {
   cfg?: boolean;
   scope?: string[];
   skipRegistry?: boolean;
+  /**
+   * Extra exclude globs appended to `config.exclude`. Lets benchmark scripts
+   * skip fixture directories that bloat self-build timings without permanently
+   * affecting `.codegraphrc.json` for normal users.
+   */
+  exclude?: string[];
 }
 
 /** Build timing result from buildGraph. */

tests/benchmarks/regression-guard.test.ts

@@ -176,18 +176,6 @@ const SKIP_VERSIONS = new Set(['3.8.0']);
  *   absolute delta 10.4ms exactly at the MIN_ABSOLUTE_DELTA floor. Exempt
  *   this release; remove once 3.11.0+ data confirms stabilization.
  *
- * - 3.10.0:Full build — adding native Verilog support (#1107) pulled the
- *   4 `.v` resolution-benchmark fixtures into the corpus the incremental
- *   benchmark sweeps (it runs against the repo root). tree-sitter-verilog
- *   is a large grammar (SystemVerilog is one of the heaviest in the
- *   tree-sitter ecosystem) so each file costs noticeably more than the
- *   other fixture languages. Local measurement: 1959 → 2809 (+43%, run
- *   25716010487). The cost is real and structural — not a regression in
- *   shared code paths. Resolution: either exclude `tests/benchmarks/
- *   resolution/fixtures/verilog/**` from the benchmark sweep or accept the
- *   one-time bump as the cost of supporting Verilog. Tracked separately;
- *   exempt this release.
- *
  * - 3.10.0:Query time — cumulative effect of adding two native extractors
  *   (Solidity #1100 + R #1102) in quick succession. Neither tripped the
  *   threshold individually (Solidity PR's Query time stayed at 49ms, R PR
@@ -230,7 +218,6 @@ const KNOWN_REGRESSIONS = new Set([
   '3.10.0:fnDeps depth 1',
   '3.10.0:fnDeps depth 3',
   '3.10.0:fnDeps depth 5',
-  '3.10.0:Full build',
   '3.10.0:Query time',
 ]);