mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-31 07:23:06 +08:00
Malte UblandClaude Opus 5.5
7cf37d9dc9
ICU builds with symbol renaming on, so its C API symbols carry the _78 version suffix, its data symbol is icudt78_dat, and its C++ symbols are Itanium manglings that name namespace icu_78. icuSymbols() classifies exactly those, and the gate's dynamic-tier check now fails a candidate that links any of them without the pattern being allowed: a program that does not lower to Intl links no ICU object at all. The engine-free Intl functions (scr_intl_num_format_en_us in scr_lib.c, scr_intl_segmenter_new in scr_grapheme.c) share the scr_intl_ prefix and are deliberately not part of the test; any scr_intl.c function that does link brings an ICU symbol with it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1030 lines
42 KiB
JavaScript
1030 lines
42 KiB
JavaScript
/* Zero-cost gate: prove that a compiler change leaves good code untouched.
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*
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* Compiles a fixed good-code set with a baseline and a candidate checkout and
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* compares IR, LLVM and release executables byte for byte, plus compile time
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* and binary size, and optionally per-function cachegrind instruction counts.
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* Both checkouts compile the same program files (from --programs, default the
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* baseline), so program paths embedded in artifacts match; checkout paths and
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* timestamps do not reach the artifacts. Builds bypass the native cache.
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*
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* The good-code set: the runtime benchmark workloads (and benchmarks/builds
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* applications), the self-hosted compiler (IR and LLVM), and the TypeScript
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* corpus programs. A program whose sources match --allow (the change's
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* pattern signature) may differ. A program whose IR and LLVM are identical
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* and whose executable differs only through changed runtime objects is
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* "runtime-only", and a difference the baseline reproduces against itself is
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* "nondeterministic": both pass with a note unless --strict. Any other
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* difference fails the gate. */
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import assert from "node:assert/strict";
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import { spawn, spawnSync } from "node:child_process";
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import { createHash } from "node:crypto";
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import {
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existsSync,
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mkdirSync,
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mkdtempSync,
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readFileSync,
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readdirSync,
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rmSync,
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statSync,
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writeFileSync,
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} from "node:fs";
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import { availableParallelism, totalmem } from "node:os";
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import { dirname, join, relative, resolve } from "node:path";
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import { fileURLToPath } from "node:url";
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import { parseArgs } from "node:util";
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import { readWorkloads } from "../benchmarks/runtime/workloads.mjs";
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import {
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artifactHash,
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cachedComparison,
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cachegrindCounts,
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changedFunctions,
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compareArtifact,
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compareCounts,
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compareExecutables,
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confinedToRuntime,
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DYNAMIC_WORKLOADS,
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definedFunctionNames,
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dynamicTierSymbols,
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linkedRuntimeFiles,
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llvmFunctionHashes,
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median,
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icuSymbols,
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nodeIslandSymbols,
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nmOutput,
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parseNm,
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programInputsHash,
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programLines,
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programVerdict,
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recordedBaseline,
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runtimePackDiff,
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timingGroups,
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timingVerdict,
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} from "./zero-cost-compare.mjs";
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const repoRoot = fileURLToPath(new URL("..", import.meta.url));
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const { values } = parseArgs({
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options: {
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baseline: { type: "string" },
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candidate: { type: "string", default: repoRoot },
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programs: { type: "string", default: "baseline" },
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set: { type: "string", default: "bench,self,corpus" },
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quick: { type: "boolean", default: false },
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corpus: { type: "string", default: "ts" },
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shard: { type: "string" },
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only: { type: "string" },
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allow: { type: "string" },
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strict: { type: "boolean", default: false },
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"timing-runs": { type: "string" },
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"self-timing-runs": { type: "string", default: "0" },
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"max-time-growth": { type: "string", default: "2" },
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"max-size-growth": { type: "string", default: "0" },
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cachegrind: { type: "boolean", default: false },
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jobs: { type: "string", default: String(Math.max(1, availableParallelism())) },
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json: { type: "string" },
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"baseline-cache": { type: "string" },
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"record-baseline-cache": { type: "string" },
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keep: { type: "boolean", default: false },
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help: { type: "boolean", default: false },
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},
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});
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if (values.help || values.baseline === undefined) {
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console.log(`Usage: node scripts/zero-cost-gate.mjs --baseline=<checkout> [--candidate=<checkout>]
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[--programs=baseline|candidate|<dir>] [--set=bench,self,corpus] [--quick]
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[--corpus=ts|all] [--shard=i/n] [--only=<regex>] [--allow=<regex>]
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[--strict] [--timing-runs=N] [--self-timing-runs=N] [--max-time-growth=2]
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[--max-size-growth=0]
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[--cachegrind] [--jobs=N] [--json=<file>] [--keep]
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[--baseline-cache=<file>] [--record-baseline-cache=<file>]
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Each checkout must be built (packages/cli/dist/bootstrap.js and this host's
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runtime pack). Both compile the same program files, taken from --programs
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(default: the baseline checkout).
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--set picks the good-code set: bench (benchmarks/runtime workloads and the
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benchmarks/builds applications), self (packages/compiler/src/native/cli.ts,
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LLVM only; the candidate's own compiler source must also build with the
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candidate), corpus (tests/corpus TypeScript programs; --corpus=all adds
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JavaScript entries). --quick is --set=bench --timing-runs=0, for CI.
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--shard=i/n keeps every n-th bench and corpus program; the self program runs
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in shard 1. scripts/zero-cost-merge.mjs merges the shards' --json reports
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into one verdict. --only filters program ids.
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--allow=<regex> is the change's pattern signature: programs whose source
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files match it may differ (reported as "allowed").
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Other differences are classified:
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runtime-only IR and LLVM identical; the executable differs only
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through runtime objects that differ between the two
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checkouts' runtime packs (every symbol the executable
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gains, loses or resizes is defined by one of them), with
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the same LLVM helper. Reported with the changed runtime
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functions it links and its size change.
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nondeterministic the baseline, building the program a second time,
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differs from its own first build in the same artifacts.
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differs anything else, in IR, LLVM or the executable.
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"differs" fails the gate. runtime-only and nondeterministic pass with a
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note; --strict fails them too, so any difference fails as before.
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--timing-runs=N (default 5) times N paired --emit=llvm builds per bench
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program, baseline and candidate side by side. The self-hosted compiler's
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comparison build is its first pair; --self-timing-runs adds more. The gate
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fails when the 95% bootstrap interval of the bench geomean ratio, or of the
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self-hosted ratio, lies entirely above --max-time-growth percent; an interval
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that straddles it is reported as inconclusive.
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--max-size-growth bounds executable growth (percent) of allowed programs.
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Dynamic-tier symbols (two-tier invariant I3): no executable may gain
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symbols under DYNAMIC_TIER_PREFIXES (scripts/zero-cost-compare.mjs) unless
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it matches --allow, and fully typed bench workloads (all but
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DYNAMIC_WORKLOADS in scripts/zero-cost-compare.mjs) may define none.
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--cachegrind (Linux, valgrind on PATH) runs differing executables under
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cachegrind (bench workloads with their arguments, corpus programs without)
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and compares instruction counts per function of the executable's own
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symbols, excluding the allocator's prefault thread.
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--record-baseline-cache=<file> builds only the baseline and records each
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program's artifact hashes (or build error) in <file>, with a hash of the
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program's inputs (its entry, its relative imports and its optimization
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level), then exits.
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--baseline-cache=<file> reads such a record: a program whose candidate
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artifacts hash the same as the recorded baseline's is identical without a
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baseline build, and the same build error on both sides is both-fail; any
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other program builds the baseline as usual, and so does a program whose
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inputs changed since the record. The record applies only to the
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baseline revision and toolchain it was made with; otherwise it is ignored.
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The self program always builds both sides, since its builds are timed.
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Exit status: 0 when the gate passes, 1 when it fails.`);
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process.exit(values.help ? 0 : 2);
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}
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const trees = { baseline: resolve(values.baseline), candidate: resolve(values.candidate) };
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for (const [label, root] of Object.entries(trees))
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assert.ok(
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existsSync(join(root, "packages/cli/dist/bootstrap.js")),
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`${label} checkout ${root} has no built CLI (packages/cli/dist/bootstrap.js)`,
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);
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const programsRoot =
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values.programs === "baseline" || values.programs === "candidate"
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? trees[values.programs]
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: resolve(values.programs);
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const sets = new Set((values.quick ? "bench" : values.set).split(","));
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for (const set of sets) assert.ok(["bench", "self", "corpus"].includes(set), `unknown set ${set}`);
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const timingRuns = Number(values["timing-runs"] ?? (values.quick ? 0 : 5));
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const selfTimingRuns = Number(values["self-timing-runs"]);
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const maxTimeGrowth = Number(values["max-time-growth"]) / 100;
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const maxSizeGrowth = Number(values["max-size-growth"]) / 100;
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const jobs = Number(values.jobs);
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assert.ok(Number.isInteger(timingRuns) && timingRuns >= 0, "--timing-runs must be >= 0");
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assert.ok(Number.isInteger(jobs) && jobs >= 1, "--jobs must be >= 1");
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assert.ok(["ts", "all"].includes(values.corpus), "--corpus must be ts or all");
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const only = values.only ? new RegExp(values.only) : null;
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const allow = values.allow ? new RegExp(values.allow, "m") : null;
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if (values.cachegrind)
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assert.equal(
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spawnSync("valgrind", ["--version"]).status,
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0,
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"--cachegrind needs valgrind on PATH",
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);
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const work = mkdtempSync("/tmp/scriptc-zero-cost-");
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/* ── the good-code set ─────────────────────────────────────────────────── */
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/** Every file a program reads: the entry and its relative imports. */
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function programInputs(entry) {
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const files = new Set();
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const pending = [entry];
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while (pending.length > 0) {
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const file = pending.pop();
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if (files.has(file)) continue;
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files.add(file);
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const text = readFileSync(file, "utf8");
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for (const match of text.matchAll(
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/(?:from|import|require)\s*\(?\s*["'](\.{1,2}\/[^"']+)["']/g,
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)) {
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const base = resolve(dirname(file), match[1]);
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const stem = base.replace(/\.(m|c)?js$/, "");
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const found = [
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base,
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`${stem}.ts`,
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`${stem}.mts`,
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`${stem}.cts`,
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`${base}.ts`,
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join(base, "index.ts"),
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].find((candidate) => existsSync(candidate) && statSync(candidate).isFile());
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if (found !== undefined) pending.push(found);
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}
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}
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return [...files];
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}
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function goodCodeSet() {
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const programs = [];
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if (sets.has("bench")) {
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const suite = join(programsRoot, "benchmarks/runtime");
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const seen = new Set();
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for (const w of readWorkloads(suite)) {
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const entry = join(suite, w.entry);
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if (seen.has(entry)) continue;
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seen.add(entry);
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programs.push({ id: `bench/${w.name}`, entry, kind: "exe", workload: w });
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}
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}
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if (sets.has("self"))
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programs.push({
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id: "self/cli",
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entry: join(programsRoot, "packages/compiler/src/native/cli.ts"),
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kind: "source",
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});
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if (sets.has("corpus")) {
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const corpus = join(programsRoot, "tests/corpus");
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const exts = values.corpus === "all" ? ["ts", "js", "mjs", "cjs"] : ["ts"];
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const entries = [];
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for (const name of readdirSync(corpus).sort()) {
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const path = join(corpus, name);
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if (statSync(path).isDirectory()) {
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const main = exts.map((ext) => join(path, `main.${ext}`)).find((p) => existsSync(p));
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if (main !== undefined) entries.push(main);
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} else if (exts.some((ext) => name.endsWith(`.${ext}`))) entries.push(path);
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}
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for (const entry of entries) {
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const head = readFileSync(entry, "utf8").split("\n", 2);
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const speed = head.some((line) => /^\/\/ @optimization:\s*speed\s*$/.test(line));
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programs.push({
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id: `corpus/${relative(corpus, entry)}`,
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entry,
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kind: "exe",
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optimization: speed ? "speed" : "release",
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});
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}
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}
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const selected = programs.filter((p) => only === null || only.test(p.id));
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if (!values.shard) return selected;
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const [index, count] = values.shard.split("/").map(Number);
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assert.ok(
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Number.isInteger(index) && Number.isInteger(count) && index >= 1 && index <= count,
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"--shard must be i/n with 1 <= i <= n",
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);
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// The self program takes minutes and pairs its own timing: shard 1 owns it.
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const self = selected.filter((p) => p.kind === "source");
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const rest = selected.filter((p) => p.kind !== "source");
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return [...(index === 1 ? self : []), ...rest.filter((_, k) => k % count === index - 1)];
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}
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/* ── builds ────────────────────────────────────────────────────────────── */
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function exec(command, args, options = {}) {
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return new Promise((resolvePromise) => {
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const started = process.hrtime.bigint();
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const child = spawn(command, args, { stdio: ["ignore", "pipe", "pipe"], ...options });
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let stdout = "";
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let stderr = "";
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child.stdout.setEncoding("utf8").on("data", (c) => (stdout += c));
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child.stderr.setEncoding("utf8").on("data", (c) => (stderr += c));
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child.on("close", (status, signal) =>
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resolvePromise({
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status,
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signal,
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stdout,
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stderr,
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ms: Number(process.hrtime.bigint() - started) / 1e6,
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}),
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);
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});
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}
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function buildEnv() {
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const env = { ...process.env, SCRIPTC_NO_CACHE: "1" };
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delete env.SCRIPTC_TIMING;
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delete env.SCRIPTC_CACHE_DIR;
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return env;
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}
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function compile(tree, args) {
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return exec(
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process.execPath,
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["--max-old-space-size=8192", join(tree, "packages/cli/dist/bootstrap.js"), "build", ...args],
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{ cwd: programsRoot, env: buildEnv() },
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);
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}
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/** Build one program with one checkout. Executable programs build once,
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* keeping the LLVM and IR beside the release executable. The self-hosted
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* compiler emits LLVM only: each of its frontend runs takes minutes, and its
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* LLVM names the first differing function as well as its IR would. */
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async function buildProgram(program, label, tree = trees[label]) {
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const dir = join(work, label, program.id.replace(/[^\w.-]+/g, "_"));
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mkdirSync(dir, { recursive: true });
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const failure = (result) => ({
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ok: false,
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error: (result.stderr || result.stdout || `exit ${result.status ?? result.signal}`)
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.replaceAll(dir, "<out>")
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.trim()
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.slice(0, 4000),
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});
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if (program.kind === "source") {
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const llvm = join(dir, "program.ll");
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const result = await compile(tree, [program.entry, "--emit=llvm", "-o", llvm]);
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if (result.status !== 0) return failure(result);
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return { ok: true, dir, llvm, ms: result.ms };
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}
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const exe = join(dir, "program");
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const result = await compile(tree, [
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program.entry,
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`--optimization=${program.optimization ?? "release"}`,
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"--keep-llvm",
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"--emit-ir",
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"-o",
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exe,
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]);
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if (result.status !== 0) return failure(result);
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const files = readdirSync(dir);
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const pick = (suffix) => {
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const name = files.find((f) => f.endsWith(suffix));
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return name === undefined ? null : join(dir, name);
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};
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return { ok: true, dir, exe, ir: pick(".ir.json"), llvm: pick(".ll"), ms: result.ms };
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}
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const nmCache = new Map();
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function nm(binary) {
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if (nmCache.has(binary)) return nmCache.get(binary);
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const result = spawnSync("nm", process.platform === "darwin" ? [binary] : ["-S", binary], {
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encoding: "utf8",
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maxBuffer: 256 * 1024 * 1024,
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});
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const text = nmOutput(binary, result);
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nmCache.set(binary, text);
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return text;
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}
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/** Names of the functions an executable defines. */
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const definedFunctions = (binary) => definedFunctionNames(nm(binary));
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|
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/** The I3 symbol check. Every executable may not gain dynamic-tier symbols
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* over the baseline (unless the program matches --allow); a fully typed
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* bench workload may contain none at all. */
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function dynamicTierCheck(program, baseline, candidate, artifacts, allowed) {
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if (!baseline.exe || !artifacts.exe) return null;
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const typed = program.id.startsWith("bench/") && !DYNAMIC_WORKLOADS.has(program.id);
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if (artifacts.exe.identical && !typed) return null;
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const after = dynamicTierSymbols(definedFunctions(candidate.exe));
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const before = artifacts.exe.identical
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? after
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: dynamicTierSymbols(definedFunctions(baseline.exe));
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const added = after.filter((name) => !before.includes(name));
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const failures = [];
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// No good-code program calls into Node.js, so none may link its runtime.
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const nodeIsland = nodeIslandSymbols(definedFunctions(candidate.exe));
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if (nodeIsland.length > 0 && !allowed)
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failures.push(`links Node island symbols: ${nodeIsland.slice(0, 5).join(", ")}`);
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// Intl over ICU is linked only into programs whose IR lowers to it. A
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// program that legitimately calls it names the pattern in --allow.
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const icu = icuSymbols(definedFunctions(candidate.exe));
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if (icu.length > 0 && !allowed) failures.push(`links ICU symbols: ${icu.slice(0, 5).join(", ")}`);
|
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if (typed && after.length > 0)
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failures.push(
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`fully typed program links dynamic-tier symbols: ${after.slice(0, 5).join(", ")}`,
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);
|
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if (added.length > 0 && !allowed)
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failures.push(`gained dynamic-tier symbols: ${added.slice(0, 5).join(", ")}`);
|
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return { typed, count: after.length, added, failures };
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}
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|
|
function compareBuilds(baseline, candidate) {
|
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const artifacts = {};
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|
for (const kind of ["ir", "llvm"]) {
|
|
if (!(kind in baseline)) continue;
|
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if (baseline[kind] === null || candidate[kind] === null) {
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artifacts[kind] = { identical: false, first: `missing ${kind} artifact` };
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continue;
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}
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artifacts[kind] = compareArtifact(
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kind,
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readFileSync(baseline[kind]),
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readFileSync(candidate[kind]),
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);
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}
|
|
if (baseline.exe) {
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const a = readFileSync(baseline.exe);
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|
const b = readFileSync(candidate.exe);
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artifacts.exe = a.equals(b)
|
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? { identical: true }
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: compareExecutables(a, b, nm(baseline.exe), nm(candidate.exe));
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artifacts.exe.bytes = { baseline: a.length, candidate: b.length };
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}
|
|
return artifacts;
|
|
}
|
|
|
|
/** Run tasks with at most `jobs` at a time; heavy tasks run alone. */
|
|
async function pool(tasks) {
|
|
const results = new Array(tasks.length);
|
|
let next = 0;
|
|
let running = 0;
|
|
let heavy = false;
|
|
await new Promise((done) => {
|
|
const pump = () => {
|
|
if (next === tasks.length && running === 0) return done();
|
|
while (next < tasks.length && running < jobs && !heavy) {
|
|
const task = tasks[next];
|
|
if (task.heavy && running > 0) break;
|
|
const index = next++;
|
|
running++;
|
|
if (task.heavy) heavy = true;
|
|
task.run().then((value) => {
|
|
results[index] = value;
|
|
running--;
|
|
if (task.heavy) heavy = false;
|
|
pump();
|
|
});
|
|
}
|
|
};
|
|
pump();
|
|
});
|
|
return results;
|
|
}
|
|
|
|
/* ── cachegrind ────────────────────────────────────────────────────────── */
|
|
|
|
async function instructionCounts(binary, args, out) {
|
|
const result = await exec("valgrind", [
|
|
"--tool=cachegrind",
|
|
"--cache-sim=no",
|
|
`--cachegrind-out-file=${out}`,
|
|
binary,
|
|
...args,
|
|
]);
|
|
// Corpus programs may exit non-zero on purpose (`// @exit: 1`).
|
|
if (result.signal !== null || !existsSync(out)) return null;
|
|
return cachegrindCounts(readFileSync(out, "utf8"), new Set(definedFunctions(binary)));
|
|
}
|
|
|
|
/* ── runtime changes ───────────────────────────────────────────────────── */
|
|
|
|
const sha256 = (file) => createHash("sha256").update(readFileSync(file)).digest("hex");
|
|
|
|
/** llvm-dis from PATH or the pinned LLVM install, or null. */
|
|
function llvmDis() {
|
|
for (const candidate of ["llvm-dis", "llvm-dis-22", "/usr/lib/llvm-22/bin/llvm-dis"])
|
|
if (spawnSync(candidate, ["--version"]).status === 0) return candidate;
|
|
const config = spawnSync("llvm-config", ["--bindir"], { encoding: "utf8" });
|
|
const fromConfig = config.status === 0 ? join(config.stdout.trim(), "llvm-dis") : null;
|
|
return fromConfig !== null && existsSync(fromConfig) ? fromConfig : null;
|
|
}
|
|
|
|
/** What differs between the two checkouts' runtime packs for this host, or
|
|
* null when no object or archive does: the changed pack files, whether the
|
|
* LLVM helper is the same, the symbols the changed objects define (on either
|
|
* side), and the functions that changed in the bitcode of the changed
|
|
* release and speed objects. Bitcode alone is not a change: it records the
|
|
* checkout's source path, so it differs between any two checkouts. */
|
|
function runtimeChanges() {
|
|
const pack = (root) =>
|
|
readdirSync(join(root, "packages"))
|
|
.filter((name) => name.startsWith("runtime-"))
|
|
.filter((name) => existsSync(join(root, "packages", name, "runtime-pack.json")));
|
|
const shared = pack(trees.candidate).filter((name) => pack(trees.baseline).includes(name));
|
|
if (shared.length !== 1) return null;
|
|
const packDir = (root) => join(root, "packages", shared[0]);
|
|
const manifest = (root) =>
|
|
JSON.parse(readFileSync(join(packDir(root), "runtime-pack.json"), "utf8"));
|
|
const linked = (paths) => paths.filter((path) => !path.endsWith(".bc"));
|
|
const all = runtimePackDiff(manifest(trees.baseline), manifest(trees.candidate));
|
|
const diff = {
|
|
changed: linked(all.changed),
|
|
added: linked(all.added),
|
|
removed: linked(all.removed),
|
|
};
|
|
if (diff.changed.length + diff.added.length + diff.removed.length === 0) return null;
|
|
const helper = (root) => {
|
|
const file = join(
|
|
root,
|
|
"packages",
|
|
shared[0].replace(/^runtime-/, "llvm-"),
|
|
"bin/scriptc-llvm-codegen",
|
|
);
|
|
return existsSync(file) ? sha256(file) : null;
|
|
};
|
|
const helperSame =
|
|
helper(trees.baseline) !== null && helper(trees.baseline) === helper(trees.candidate);
|
|
const symbols = new Set();
|
|
const objects = [...diff.changed, ...diff.added, ...diff.removed].filter((path) =>
|
|
path.endsWith(".o"),
|
|
);
|
|
for (const path of linkedRuntimeFiles(diff))
|
|
for (const root of [trees.baseline, trees.candidate]) {
|
|
const file = join(packDir(root), path);
|
|
if (!existsSync(file)) continue;
|
|
const listed = spawnSync("nm", ["--defined-only", file], {
|
|
encoding: "utf8",
|
|
maxBuffer: 1 << 28,
|
|
});
|
|
for (const symbol of parseNm(listed.stdout ?? "")) symbols.add(symbol.name);
|
|
}
|
|
// Changed functions, by unit, from the bitcode of the release and speed
|
|
// flavors (the ones the gate builds with).
|
|
const dis = llvmDis();
|
|
const functions = { changed: new Set(), added: new Set(), removed: new Set(), units: new Set() };
|
|
for (const object of objects)
|
|
functions.units.add(object.replace(/^.*\//, "").replace(/\.o$/, ".c"));
|
|
const bitcode = objects
|
|
.filter((path) => /^artifacts\/(release|speed)\//.test(path))
|
|
.map((path) => path.replace(/\.o$/, ".bc"));
|
|
for (const path of bitcode) {
|
|
if (dis === null) continue;
|
|
const text = (root) => {
|
|
const file = join(packDir(root), path);
|
|
if (!existsSync(file)) return new Map();
|
|
const out = spawnSync(dis, [file, "-o", "-"], { encoding: "utf8", maxBuffer: 1 << 30 });
|
|
return llvmFunctionHashes(out.stdout ?? "");
|
|
};
|
|
const delta = changedFunctions(text(trees.baseline), text(trees.candidate));
|
|
for (const kind of ["changed", "added", "removed"])
|
|
for (const name of delta[kind]) functions[kind].add(name);
|
|
}
|
|
return {
|
|
pack: shared[0],
|
|
diff,
|
|
helperSame,
|
|
symbols,
|
|
disassembler: dis,
|
|
functions: Object.fromEntries(
|
|
Object.entries(functions).map(([kind, names]) => [kind, [...names].sort()]),
|
|
),
|
|
};
|
|
}
|
|
|
|
/** The changed runtime functions an executable defines. */
|
|
function linkedRuntimeChanges(runtime, binary) {
|
|
const defined = new Set(definedFunctions(binary));
|
|
const pick = (names) => names.filter((name) => defined.has(name));
|
|
return {
|
|
changed: pick(runtime.functions.changed),
|
|
added: pick(runtime.functions.added),
|
|
};
|
|
}
|
|
|
|
/* ── main ──────────────────────────────────────────────────────────────── */
|
|
|
|
function revision(root) {
|
|
const r = spawnSync("git", ["-C", root, "rev-parse", "--short", "HEAD"], { encoding: "utf8" });
|
|
if (r.status !== 0) return null;
|
|
const dirty = spawnSync("git", ["-C", root, "status", "--porcelain", "--untracked-files=no"], {
|
|
encoding: "utf8",
|
|
});
|
|
return r.stdout.trim() + (dirty.stdout.trim() ? "+dirty" : "");
|
|
}
|
|
|
|
const fmtMs = (ms) => `${(ms / 1000).toFixed(2)}s`;
|
|
const pct = (ratio) => `${ratio >= 1 ? "+" : ""}${((ratio - 1) * 100).toFixed(2)}%`;
|
|
|
|
/* ── baseline cache ────────────────────────────────────────────────────── */
|
|
|
|
/** Every file under `dir`, recursively, in a stable order. */
|
|
function filesUnder(dir) {
|
|
if (!existsSync(dir)) return [];
|
|
return readdirSync(dir, { recursive: true, withFileTypes: true })
|
|
.filter((d) => d.isFile())
|
|
.map((d) => join(d.parentPath, d.name))
|
|
.sort();
|
|
}
|
|
|
|
/** What a baseline build depends on besides the program: the checkout's
|
|
* built compiler and CLI, its runtime packs and LLVM helpers, Node, the
|
|
* host and the program and checkout paths that reach the artifacts. */
|
|
function toolchainFingerprint(root) {
|
|
const h = createHash("sha1");
|
|
h.update(JSON.stringify([process.platform, process.arch, process.version, root, programsRoot]));
|
|
const clang = spawnSync("clang", ["--version"], { encoding: "utf8" });
|
|
h.update(clang.stdout ?? "");
|
|
// Linux links use ld.lld when the driver finds it, else the system linker.
|
|
const lld = spawnSync("clang", ["-print-prog-name=ld.lld"], { encoding: "utf8" });
|
|
const lldPath = (lld.stdout ?? "").trim();
|
|
h.update(lldPath);
|
|
if (lldPath.startsWith("/") && existsSync(lldPath))
|
|
h.update(spawnSync(lldPath, ["--version"], { encoding: "utf8" }).stdout ?? "");
|
|
const packages = join(root, "packages");
|
|
for (const name of readdirSync(packages).sort()) {
|
|
const dir = join(packages, name);
|
|
const files = [
|
|
...filesUnder(join(dir, "dist")),
|
|
...(name.startsWith("runtime-")
|
|
? [join(dir, "runtime-pack.json"), ...filesUnder(join(dir, "artifacts"))]
|
|
: []),
|
|
...(name.startsWith("llvm-") ? filesUnder(join(dir, "bin")) : []),
|
|
];
|
|
for (const file of files)
|
|
if (existsSync(file)) h.update(relative(root, file)).update(readFileSync(file));
|
|
}
|
|
return h.digest("hex");
|
|
}
|
|
|
|
/** The hash of `program`'s inputs, which its baseline cache entry records. */
|
|
function inputsHash(program) {
|
|
return programInputsHash(
|
|
programsRoot,
|
|
programInputs(program.entry),
|
|
program.kind === "source" ? "source" : (program.optimization ?? "release"),
|
|
(file) => readFileSync(file),
|
|
);
|
|
}
|
|
|
|
/** The content hashes of one build's artifacts (null for a missing one). */
|
|
function buildHashes(build) {
|
|
const hashes = {};
|
|
for (const kind of ["ir", "llvm", "exe"])
|
|
if (kind in build)
|
|
hashes[kind] = build[kind] === null ? null : artifactHash(readFileSync(build[kind]));
|
|
return hashes;
|
|
}
|
|
|
|
const recordPath = values["record-baseline-cache"];
|
|
let baselineCache = null;
|
|
if (recordPath === undefined && values["baseline-cache"] !== undefined) {
|
|
const file = resolve(values["baseline-cache"]);
|
|
const cache = existsSync(file) ? JSON.parse(readFileSync(file, "utf8")) : null;
|
|
const fingerprint = cache === null ? null : toolchainFingerprint(trees.baseline);
|
|
if (cache?.schema === 2 && cache.fingerprint === fingerprint) baselineCache = cache;
|
|
else
|
|
console.log(
|
|
`baseline cache ${file} ${cache === null ? "is missing" : "was made with another baseline or toolchain"}; building every baseline`,
|
|
);
|
|
}
|
|
|
|
const programs = goodCodeSet().filter((p) => recordPath === undefined || p.kind !== "source");
|
|
assert.ok(programs.length > 0, "the selected good-code set is empty");
|
|
const runtime = recordPath === undefined ? runtimeChanges() : null;
|
|
const report = {
|
|
schema: 1,
|
|
date: new Date().toISOString(),
|
|
host: { platform: process.platform, arch: process.arch, node: process.version },
|
|
trees: Object.fromEntries(
|
|
Object.entries(trees).map(([label, root]) => [label, { root, revision: revision(root) }]),
|
|
),
|
|
programsRoot,
|
|
allow: values.allow ?? null,
|
|
strict: values.strict,
|
|
runtime:
|
|
runtime === null
|
|
? null
|
|
: {
|
|
pack: runtime.pack,
|
|
...runtime.diff,
|
|
helperSame: runtime.helperSame,
|
|
functions: runtime.functions,
|
|
},
|
|
programs: [],
|
|
timing: null,
|
|
failures: [],
|
|
// Failures judged over the whole good-code set (compile time, nothing
|
|
// compared); scripts/zero-cost-merge.mjs recomputes them across shards.
|
|
globalFailures: [],
|
|
baselineCache:
|
|
baselineCache === null
|
|
? null
|
|
: { programs: Object.keys(baselineCache.programs).length, used: 0 },
|
|
};
|
|
console.log(
|
|
`zero-cost gate: ${programs.length} programs (${[...sets].join(", ")}), ` +
|
|
`baseline ${trees.baseline}, candidate ${trees.candidate}, programs from ${programsRoot}`,
|
|
);
|
|
if (runtime !== null) {
|
|
const { changed, added, removed } = runtime.diff;
|
|
console.log(
|
|
`runtime pack ${runtime.pack} differs: ${changed.length} changed, ${added.length} added, ` +
|
|
`${removed.length} removed files; units ${runtime.functions.units.join(", ") || "none"}` +
|
|
(runtime.helperSame ? "" : "; the LLVM helper differs too, so nothing is runtime-only"),
|
|
);
|
|
if (runtime.disassembler === null)
|
|
console.log("runtime functions: llvm-dis not found, so changed functions are not listed");
|
|
else
|
|
console.log(
|
|
`runtime functions: ${runtime.functions.changed.length} changed` +
|
|
(runtime.functions.changed.length
|
|
? ` (${runtime.functions.changed.slice(0, 20).join(", ")})`
|
|
: "") +
|
|
`, ${runtime.functions.added.length} added, ${runtime.functions.removed.length} removed`,
|
|
);
|
|
}
|
|
|
|
let failed = false;
|
|
const started = Date.now();
|
|
|
|
if (recordPath !== undefined) {
|
|
const record = {
|
|
schema: 2,
|
|
date: report.date,
|
|
fingerprint: toolchainFingerprint(trees.baseline),
|
|
baseline: report.trees.baseline,
|
|
programs: {},
|
|
};
|
|
await pool(
|
|
programs.map((program) => ({
|
|
run: async () => {
|
|
const build = await buildProgram(program, "baseline");
|
|
const inputs = inputsHash(program);
|
|
record.programs[program.id] = build.ok
|
|
? {
|
|
inputs,
|
|
ok: true,
|
|
ms: build.ms,
|
|
hashes: buildHashes(build),
|
|
...(build.exe ? { exeBytes: statSync(build.exe).size } : {}),
|
|
}
|
|
: { inputs, ok: false, ms: build.ms ?? null, error: build.error };
|
|
if (build.dir) rmSync(build.dir, { recursive: true, force: true });
|
|
},
|
|
})),
|
|
);
|
|
mkdirSync(dirname(resolve(recordPath)), { recursive: true });
|
|
writeFileSync(recordPath, JSON.stringify(record) + "\n");
|
|
rmSync(work, { recursive: true, force: true });
|
|
const failures = Object.values(record.programs).filter((p) => !p.ok).length;
|
|
console.log(
|
|
`zero-cost gate: recorded ${programs.length} baseline programs (${failures} build errors) ` +
|
|
`in ${recordPath} in ${fmtMs(Date.now() - started)}`,
|
|
);
|
|
process.exit(0);
|
|
}
|
|
|
|
/** The candidate's own compiler source must still build with the candidate
|
|
* (see below). On a host with room for a third self-hosted build it runs
|
|
* alongside the comparison builds instead of after them. */
|
|
const checkCandidateSelf =
|
|
sets.has("self") && programsRoot !== trees.candidate && programs.some((p) => p.kind === "source");
|
|
const buildCandidateSelf = () =>
|
|
buildProgram(
|
|
{
|
|
id: "self/candidate-source",
|
|
entry: join(trees.candidate, "packages/compiler/src/native/cli.ts"),
|
|
kind: "source",
|
|
},
|
|
"candidate",
|
|
);
|
|
const earlyCandidateSelf =
|
|
checkCandidateSelf && totalmem() >= 40 * 1024 ** 3 ? buildCandidateSelf() : null;
|
|
|
|
await pool(
|
|
programs.map((program) => ({
|
|
heavy: program.kind === "source",
|
|
run: async () => {
|
|
const recorded =
|
|
program.kind === "source" || baselineCache === null
|
|
? undefined
|
|
: recordedBaseline(baselineCache, program.id, inputsHash(program));
|
|
let baseline;
|
|
let candidate;
|
|
let settled = null;
|
|
if (recorded === undefined)
|
|
[baseline, candidate] = await Promise.all([
|
|
buildProgram(program, "baseline"),
|
|
buildProgram(program, "candidate"),
|
|
]);
|
|
else {
|
|
candidate = await buildProgram(program, "candidate");
|
|
settled = cachedComparison(recorded, candidate, candidate.ok ? buildHashes(candidate) : {});
|
|
// A cached identical baseline has the candidate's artifacts.
|
|
baseline =
|
|
settled === null
|
|
? await buildProgram(program, "baseline")
|
|
: settled.baseline.ok
|
|
? { ...candidate, ms: settled.baseline.ms, cached: true }
|
|
: settled.baseline;
|
|
if (settled !== null) report.baselineCache.used++;
|
|
}
|
|
const allowed =
|
|
allow !== null &&
|
|
programInputs(program.entry).some((f) => allow.test(readFileSync(f, "utf8")));
|
|
const artifacts =
|
|
settled?.artifacts ??
|
|
(baseline.ok && candidate.ok ? compareBuilds(baseline, candidate) : {});
|
|
// The benchmark workloads and the self-hosted compiler always build.
|
|
const required = !program.id.startsWith("corpus/");
|
|
const runtimeOnly =
|
|
runtime !== null &&
|
|
runtime.helperSame &&
|
|
artifacts.exe !== undefined &&
|
|
!artifacts.exe.identical &&
|
|
confinedToRuntime(artifacts.exe, runtime.symbols);
|
|
const judge = (nondeterministic) =>
|
|
programVerdict({
|
|
baseline,
|
|
candidate,
|
|
artifacts,
|
|
allowed,
|
|
required,
|
|
runtimeOnly,
|
|
nondeterministic,
|
|
strict: values.strict,
|
|
});
|
|
let { verdict, fails } = judge([]);
|
|
// Build a difference the change cannot explain once more with the
|
|
// baseline: when the baseline's two builds differ in the same
|
|
// artifacts, the difference is the build's, not the change's.
|
|
let recheck = null;
|
|
if (verdict === "differs") {
|
|
const again = await buildProgram(program, "recheck", trees.baseline);
|
|
if (again.ok) {
|
|
const self = compareBuilds(baseline, again);
|
|
recheck = Object.keys(artifacts).filter(
|
|
(kind) => !artifacts[kind].identical && !self[kind]?.identical,
|
|
);
|
|
if (again.dir && !values.keep) rmSync(again.dir, { recursive: true, force: true });
|
|
}
|
|
if (recheck?.length) ({ verdict, fails } = judge(recheck));
|
|
}
|
|
const entry = {
|
|
id: program.id,
|
|
verdict,
|
|
allowed,
|
|
buildMs: { baseline: baseline.ms ?? null, candidate: candidate.ms ?? null },
|
|
artifacts,
|
|
};
|
|
if (verdict === "runtime-only") entry.runtime = linkedRuntimeChanges(runtime, candidate.exe);
|
|
if (verdict === "nondeterministic") entry.nondeterministic = recheck;
|
|
if (settled !== null) entry.cachedBaseline = true;
|
|
if (!baseline.ok) entry.baselineError = baseline.error;
|
|
if (!candidate.ok) entry.candidateError = candidate.error;
|
|
const size = artifacts.exe?.bytes;
|
|
if (verdict === "allowed" && size && size.candidate > size.baseline * (1 + maxSizeGrowth)) {
|
|
entry.sizeFailure = true;
|
|
report.failures.push(
|
|
`${program.id}: executable grew ${size.baseline} -> ${size.candidate} bytes`,
|
|
);
|
|
}
|
|
if (fails) report.failures.push(`${program.id}: ${verdict}`);
|
|
const symbols =
|
|
baseline.ok && candidate.ok
|
|
? dynamicTierCheck(program, baseline, candidate, artifacts, allowed)
|
|
: null;
|
|
if (symbols !== null) entry.dynamicTier = symbols;
|
|
for (const failure of symbols?.failures ?? [])
|
|
report.failures.push(`${program.id}: ${failure}`);
|
|
if (fails || entry.sizeFailure || symbols?.failures.length) failed = true;
|
|
if (values.cachegrind && artifacts.exe && !artifacts.exe.identical) {
|
|
// Bench workloads run with their benchmark arguments; corpus
|
|
// programs take none.
|
|
const w = program.workload ?? { args: [] };
|
|
if (w.kind === "server" || w.args.includes("{input}"))
|
|
entry.cachegrind = { skipped: "needs a server client or generated input" };
|
|
else {
|
|
const counts = await Promise.all([
|
|
instructionCounts(baseline.exe, w.args, join(baseline.dir, "cg.out")),
|
|
instructionCounts(candidate.exe, w.args, join(candidate.dir, "cg.out")),
|
|
]);
|
|
entry.cachegrind = counts.includes(null)
|
|
? { skipped: "valgrind run failed" }
|
|
: (({ deltas, ...rest }) => ({ ...rest, deltas: deltas.slice(0, 20) }))(
|
|
compareCounts(counts[0], counts[1]),
|
|
);
|
|
}
|
|
}
|
|
printProgram(entry);
|
|
report.programs.push(entry);
|
|
nmCache.delete(baseline.exe);
|
|
nmCache.delete(candidate.exe);
|
|
if (!values.keep) {
|
|
if (baseline.dir && !baseline.cached)
|
|
rmSync(baseline.dir, { recursive: true, force: true });
|
|
if (candidate.dir) rmSync(candidate.dir, { recursive: true, force: true });
|
|
}
|
|
},
|
|
})),
|
|
);
|
|
|
|
function printProgram(entry) {
|
|
for (const line of programLines(entry)) console.log(line);
|
|
}
|
|
|
|
/* Compile time: paired --emit=llvm builds, the baseline and the candidate
|
|
* side by side, one program at a time. Identical LLVM means everything after
|
|
* emission (LLVM optimization, linking) costs the same, so the timed part is
|
|
* the compiler's own work. The self-hosted compiler takes minutes per build;
|
|
* its main comparison build is its first pair. */
|
|
if (timingRuns > 0) {
|
|
const rows = [];
|
|
const pair = async (program) => {
|
|
const [baseline, candidate] = await Promise.all(
|
|
["baseline", "candidate"].map((label) =>
|
|
compile(trees[label], [
|
|
program.entry,
|
|
"--emit=llvm",
|
|
"-o",
|
|
join(work, `timing-${label}.ll`),
|
|
]),
|
|
),
|
|
);
|
|
return baseline.status === 0 && candidate.status === 0 ? [baseline.ms, candidate.ms] : null;
|
|
};
|
|
for (const program of programs) {
|
|
if (program.id.startsWith("corpus/")) continue;
|
|
const row = { id: program.id, baselineMs: [], candidateMs: [], ratios: [] };
|
|
const add = (sample) => {
|
|
if (sample === null) return;
|
|
row.baselineMs.push(Math.round(sample[0]));
|
|
row.candidateMs.push(Math.round(sample[1]));
|
|
row.ratios.push(sample[1] / sample[0]);
|
|
};
|
|
const runs = program.kind === "source" ? selfTimingRuns : timingRuns;
|
|
if (program.kind === "source") {
|
|
const built = report.programs.find((p) => p.id === program.id)?.buildMs;
|
|
if (built?.baseline && built?.candidate) add([built.baseline, built.candidate]);
|
|
}
|
|
for (let run = 0; run < runs; run++) add(await pair(program));
|
|
if (row.ratios.length === 0) continue;
|
|
rows.push(row);
|
|
console.log(
|
|
`time ${program.id} ${fmtMs(median(row.baselineMs))} -> ${fmtMs(median(row.candidateMs))} ` +
|
|
`(${pct(median(row.ratios))}, ${row.ratios.length} pairs)`,
|
|
);
|
|
}
|
|
report.timing = { runs: timingRuns, maxGrowth: maxTimeGrowth, rows, groups: {} };
|
|
for (const [name, group] of Object.entries(timingGroups(rows))) {
|
|
if (group.length === 0) continue;
|
|
const { result, line, failure } = timingVerdict(name, group, maxTimeGrowth);
|
|
report.timing.groups[name] = result;
|
|
console.log(line);
|
|
if (failure !== null) {
|
|
failed = true;
|
|
report.failures.push(failure);
|
|
report.globalFailures.push(failure);
|
|
}
|
|
}
|
|
}
|
|
|
|
// The self program is the baseline's compiler source (the programs come
|
|
// from one checkout), so a change that adds compiler code the self-hosted
|
|
// frontend cannot lower would pass unnoticed. The candidate's own compiler
|
|
// source must still build with the candidate (LLVM only, not compared).
|
|
if (checkCandidateSelf) {
|
|
const result = await (earlyCandidateSelf ?? buildCandidateSelf());
|
|
report.candidateSelf = result.ok
|
|
? { ok: true, buildMs: result.ms }
|
|
: { ok: false, error: result.error };
|
|
console.log(
|
|
result.ok
|
|
? `self candidate compiler source builds with the candidate (${fmtMs(result.ms)})`
|
|
: `self candidate compiler source FAILS to build with the candidate`,
|
|
);
|
|
if (!result.ok) {
|
|
failed = true;
|
|
report.failures.push(`self/candidate-source: ${result.error.split("\n")[0]}`);
|
|
}
|
|
}
|
|
|
|
const counts = {};
|
|
for (const p of report.programs) counts[p.verdict] = (counts[p.verdict] ?? 0) + 1;
|
|
const compared = ["identical", "allowed", "runtime-only", "nondeterministic", "differs"];
|
|
if (!report.programs.some((p) => compared.includes(p.verdict))) {
|
|
failed = true;
|
|
const failure = "no program built with both checkouts, so nothing was compared";
|
|
report.failures.push(failure);
|
|
report.globalFailures.push(failure);
|
|
}
|
|
report.counts = counts;
|
|
report.verdict = failed ? "fail" : "pass";
|
|
report.elapsedMs = Date.now() - started;
|
|
if (values.json) {
|
|
mkdirSync(dirname(resolve(values.json)), { recursive: true });
|
|
writeFileSync(values.json, JSON.stringify(report, null, 2) + "\n");
|
|
}
|
|
if (!values.keep) rmSync(work, { recursive: true, force: true });
|
|
else console.log(`artifacts kept in ${work}`);
|
|
const noted = report.programs.filter((p) =>
|
|
["runtime-only", "nondeterministic"].includes(p.verdict),
|
|
);
|
|
console.log(
|
|
`zero-cost gate: ${failed ? "FAIL" : noted.length ? "PASS with notes" : "PASS"} — ${Object.entries(
|
|
counts,
|
|
)
|
|
.map(([k, v]) => `${v} ${k}`)
|
|
.join(", ")} in ${fmtMs(report.elapsedMs)}` +
|
|
(report.baselineCache ? ` (${report.baselineCache.used} baselines from the cache)` : ""),
|
|
);
|
|
const runtimeOnlyPrograms = report.programs.filter((p) => p.verdict === "runtime-only");
|
|
if (runtimeOnlyPrograms.length > 0) {
|
|
const deltas = runtimeOnlyPrograms.map(
|
|
(p) => p.artifacts.exe.bytes.candidate - p.artifacts.exe.bytes.baseline,
|
|
);
|
|
const signed = (n) => `${n > 0 ? "+" : ""}${n}`;
|
|
const linked = new Set(
|
|
runtimeOnlyPrograms.flatMap((p) => [...p.runtime.changed, ...p.runtime.added]),
|
|
);
|
|
console.log(
|
|
` note: ${runtimeOnlyPrograms.length} runtime-only programs (IR and LLVM identical); ` +
|
|
`executable size ${signed(Math.min(...deltas))} to ${signed(Math.max(...deltas))} bytes; ` +
|
|
`changed runtime functions linked: ${[...linked].sort().join(", ") || "none listed"}` +
|
|
(values.strict ? "" : " (--strict fails these)"),
|
|
);
|
|
}
|
|
const nondeterministicPrograms = report.programs.filter((p) => p.verdict === "nondeterministic");
|
|
if (nondeterministicPrograms.length > 0)
|
|
console.log(
|
|
` note: ${nondeterministicPrograms.length} nondeterministic programs, whose baseline rebuild differs too: ` +
|
|
nondeterministicPrograms.map((p) => p.id).join(", "),
|
|
);
|
|
for (const failure of report.failures) console.log(` ${failure}`);
|
|
process.exit(failed ? 1 : 0);
|