feat(cli): add a Java/JVM performance path rule to /review - #8379
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The review's dimensions are domain-blind, and a Java diff's most expensive regressions are decided by the JVM, not by anything visible in the source: HotSpot chooses what to inline and what to compile by the callee's bytecode size (MaxTrivialSize 6 / MaxInlineSize 35 / FreqInlineSize 325 / HugeMethodLimit 8000), and a one-line change can flip it on a hot path. Like the GitHub Actions rule before it, the checklist attaches to *.java paths and reaches every code-reviewing agent whose territory contains one, scoped so non-Java diffs pay nothing. It carries: - the correctness traps dressed as perf/concurrency code (shared SimpleDateFormat, two-call ConcurrentHashMap compounds, DCL without volatile) at Critical; - the JVM-cost defects provable from source (per-call regex compiles, loop string +=, hot-path boxing, capturing lambdas in loops, unconditional log-message building, unpresized collections, legacy synchronized types, exceptions as control flow, per-call reflection) at Suggestion; - the JIT inlining thresholds with a two-tier verification discipline: measure with javap against base and head (never estimate bytecode from source), or run -XX:+PrintInlining / JMH when the code is runnable; unmeasured inlining claims are reported as mechanism at low confidence. Dogfooded against alibaba/fastjson2#3992 (BigDecimal parsing perf): the performance agent applied the threshold reasoning correctly — readBigDecimal was already far above FreqInlineSize before the diff and the change shrinks it, so no crossing was possible and no measurement was owed, stated with exactly that justification. Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
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Thanks for the PR! Template looks good ✓ Problem: real and well-motivated. The review dimensions are domain-blind by design, and a Java diff's most expensive regressions — HotSpot dropping a hot method from inlining when it crosses a bytecode-size threshold — are decided by the JVM and invisible in the source. No dimension agent asks that question today. This isn't theoretical hardening: the PR carries a concrete dogfood run (alibaba/fastjson2#3992) showing the rule reaching the agents and the performance agent applying the threshold reasoning correctly rather than fabricating a finding. Direction: aligned. It extends the existing path-rule mechanism ( Size: not applicable — Approach: the scope feels right. One rule, one registration in Risk: no elevated risk signals — neither changed file matches the revert-correlated high-risk paths. Moving on to code review. 🔍 中文说明感谢贡献！ 模板完整 ✓ 问题：真实且动机充分。review 的维度按设计是领域盲的，而 Java diff 最昂贵的回归——热方法字节码大小跨阈后被 HotSpot 移出内联——由 JVM 决定，源码里完全看不见。目前没有任何 dimension agent 会问这个问题。这不是理论性加固：PR 提供了具体的 dogfood（alibaba/fastjson2#3992），证明规则确实下发到了各 agent，且性能 agent 正确应用了阈值推理，而不是编造 finding。 方向：对齐。它复用了既有的 path rule 机制（ 规模：不适用—— 方案：范围合理。一条规则、在 风险：无升级风险信号——两个改动文件都不命中与 revert 相关的高风险路径。 进入代码审查 🔍 — Qwen Code · qwen3.8-max-preview Reviewed at |
Code reviewMy independent take before reading the diff: add a The implementation follows the established pattern cleanly: it reuses the existing I cross-checked every test assertion against the checklist text — the trigger paths, the No critical blockers, no convention violations. Nothing to change. Test evidence (the PR's own CI, read via the API — PR code not executed)CI on the reviewed commit is still running — the Ubuntu unit suite and the Desktop Shell job are in flight, so there is no green result to quote yet. I'm not polling; the table below is wrapped so the finalize job rewrites it once CI settles. The macOS/Windows test jobs and the integration/verify/tmux jobs show Final CI results for
One row per check name (latest run); skipped checks omitted; failures sort first. / 每个检查名一行（取最新一次运行），省略 skipped，失败项排在最前。 Sandboxed verification would settle the one thing the unit tests can't: 中文说明代码审查读 diff 前我的独立方案：新增一个 实现干净地遵循既有模式：复用现有 我逐条比对了测试断言与清单文本——触发路径、 无关键阻塞，无规范违反。无需改动。 测试证据（通过 API 读取 PR 自身 CI——未执行 PR 代码）所审 commit 的 CI 仍在运行——Ubuntu 单测套件与 Desktop Shell 任务在执行中，因此还没有可引用的绿色结果。我不轮询；下方表格已用区域标记包裹，CI 落定后 finalize 任务会就地改写。macOS/Windows 测试任务与 integration/verify/tmux 任务显示 沙箱验证可以解决单测无法覆盖的一点： — Qwen Code · qwen3.8-max-preview Reviewed at |
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Confidence: 4/5 — a clean, well-scoped extension of the path-rule mechanism; the only thing I can't attest to yet is the CI result, which is still in flight. Stepping back: this earns its place. The path-rule design exists precisely for failure modes a domain-blind reviewer can't see, and JVM inlining is a textbook case — decided by bytecode size, invisible in source, and the one place a reviewer who guesses teaches authors to ignore the whole review. The measure-don't-estimate discipline is the right answer to that, and it's the same contract the review already applies to benchmark claims. The implementation does one thing: one rule, one registration, tests that pin the load-bearing content. No drive-by changes, no new abstraction, nothing to maintain beyond the checklist text itself. My one honest reservation, and it's why this is 4 not 5: the checklist's value is a bet that the JIT-inlining section pays off across many real Java reviews rather than becoming skimmable bulk. The dogfood (fastjson2#3992) is a single data point — a good one, where the agent correctly reasoned that a shrinking method owed no measurement — but it's the author's own run. That's the nature of a prompt-content change; it isn't a defect, just the thing a maintainer is signing up to find out. Verdict: approve. CI on 中文说明置信度：4/5 —— 对 path rule 机制的一次干净、范围恰当的扩展；唯一还无法背书的，是仍在运行中的 CI 结果。 退一步看：这条规则配得上它的位置。path rule 的设计本就是为了领域盲 reviewer 看不见的失败模式，而 JVM 内联是教科书级的例子——由字节码大小决定、源码里看不见，且恰恰是 reviewer 一旦靠猜就会教会作者无视整份 review 的地方。"测量而非估算"的纪律是对此的正确回答，也与 review 对 benchmark 数字既有的契约一致。实现只做一件事：一条规则、一次注册、以及钉住承重内容的测试。没有顺手改动，没有新抽象，除了清单文本本身没有别的要维护。 我唯一诚实的保留，也是给 4 而非 5 的原因：这份清单的价值是一个赌注——JIT 内联那一节能否在众多真实 Java review 中兑现价值，而不是沦为可被略过的冗长内容。dogfood（fastjson2#3992）是单个数据点——而且是好的那种，agent 正确推理出收缩的方法不欠测量——但那是作者自己的运行。这是 prompt 内容类改动的天性，不是缺陷，只是维护者需要去验证的东西。 结论：approve。 — Qwen Code · qwen3.8-max-preview Reviewed at |
Code Coverage Summary
CLI Package - Full Text ReportCore Package - Full Text ReportFor detailed HTML reports, please see the 'coverage-reports-22.x-ubuntu-latest' artifact from the main CI run. |
An A/B experiment measured what the checklist adds on top of the model. Four crafted Java diffs (a hot method grown past FreqInlineSize, a map-backed cache, a per-element append loop, a precompiled regex parser) were each reviewed by a blind Agent-4 equivalent with and without the Java path rule, on qwen3.8-max-preview. Without the rule, the performance agent never once considered inlining across all four diffs, and filed a high-confidence finding that a constant long division costs 20-90 cycles per iteration — bytecode-true, but C2 strength-reduces constant division to a multiply-by-magic-number, so the cost does not survive the JIT. With the rule, it measured every diff with javap (base 80 bytes, head 338, crossing FreqInlineSize at 325), reported the crossing at low confidence with the tier-2 check named, dismissed the division with the correct mechanism, and proposed the fix as a hot/cold split with the exact bytecode range to extract. The fix shape is the part the model does not supply on its own, so the checklist now names it: move cold paths into a private helper, never @ForceInline (which bloats every caller), and state the extraction as a bytecode range and a resulting size. The same experiment cut three candidate additions — dense-key cache container choice, per-element-to-bulk loops, and regex-for-fixed-formats — because the control runs reached the same findings without them. Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
Review — Java/JVM path rule for
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Seven findings from the PR review, all verified before fixing:
- The static measurement tier prescribed 'compile the base revision the
same way', which reads as git checkout/stash in the one worktree nine
agents share concurrently — or in the user's own checkout in local
mode, where reviewsCode agents get no 'do not build the main checkout'
guard (that guard is role-7-only). Rewritten as a non-mutating
procedure: extract the base side with git show into a scratch dir,
javac -d there, never checkout/stash/build in place.
- A full mvn/gradle build runs the branch's contributor-controlled build
logic; the checklist now says to prefer javac on the extracted file
and treat any build it does run as untrusted code (Agent 7's brief
already carried this caveat; the rule extended the capability to nine
agents without it).
- InlineSmallCode cited as ~1000 (the pre-JDK-11 value); measured 2500
on a live JVM. HugeMethodLimit is a develop flag gated by the product
DontCompileHugeMethods, and the boundary is > 8000, not >= 8000.
- 'Megamorphic -> no inlining at any size' overstated C2: a dominant
receiver (TypeProfileMajorReceiverPercent, 90%) is still inlined
behind a guard with an uncommon trap.
- pathRulesFor listed every triggering path in the heading of every
agent's brief; a 200-file Java PR put ~11 KB of paths there. Capped at
ten plus a count, for both rules.
- The flat 'performance findings are Suggestions' carried no escape
hatch; added the one the workflow rule already needed — unbounded cost
on attacker-reachable input is a DoS hole, graded Critical.
- Nits: the split fast-path excludes regex metacharacters (split(".")
does not take it); test and generated sources are out of scope for the
hot-path items; the Java match rows fold into the shared governed-table
test so both rules assert through PATH_RULES.matches.
Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
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All seven verified and fixed in #1 (unsafe measurement in the shared worktree) — fixed. Confirmed the guard is role-7-only ( #2 (untrusted build logic) — fixed. The tier now says a full #3 (wrong numbers) — fixed, and re-measured on a live JVM before fixing. #4 (megamorphic overstatement) — fixed. Now: no inlining unless one receiver still dominates the profile ( #5 (11 KB path list in the heading) — fixed. #6 (flat Suggestions rule) — fixed. Added the escape hatch the workflow rule already had to walk back: unbounded allocation / quadratic work / unbounded cache growth on attacker-reachable input is a DoS hole, graded Critical — with "name the reachable input" as the gate so "this loop is slow" stays a Suggestion. #7 (nits) — all fixed. Tests: 29 passing (was 25). One residual I did not change, flagging for your call: the static tier still leads with |
Review —
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Review — Agent 6c (undirected audit, six-months-later maintainer)What I examined
Checklist factual claims, cross-checked against the pinning tests: Test suite: Every Two-rule interaction: Stacking confirmed by test; no ordering or duplication hazard. FindingsNone. No Critical, Suggestion, or Nice-to-have to file. |
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Reviewed. Suggestions are inline.
中文说明
已审查。 建议见行内评论。
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Reviewed — no blockers. Suggestions are inline. Test Plan (not a blocker): 29 tests pass — this review observed 16854 passed.
中文说明
已审查——无阻断问题。 建议见行内评论。 Test Plan（非阻断）：29 tests pass — this review observed 16854 passed。
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Six findings plus nits and three inline coverage probes, all verified: - The 'safe' javac tier still executed contributor code: annotation processors on the classpath run at compile time. Add -proc:none (not optional), and make mvn/gradle a prohibition rather than a discouraged preference — on a stranger's PR branch the build logic is the attack surface. - /tmp/<scratch> was a placeholder agents converge on; two compiling different revisions of one class into the same dir measure each other's bytecode. Prescribe SCRATCH=$(mktemp -d), with a %TEMP% note for Windows. - 'Extract and javac' fails on any class with imports. Name the classpath path (-sourcepath at the module root, an existing target/classes, or mvn dependency:build-classpath which resolves without building) and a graceful fall-back to the mechanism tier instead of escalating to a project build. - @ForceInline was ruled out for bloating callers — true but secondary, and the annotation is JDK-internal, not general. Lead with the anti-pattern that actually bites app code (reaching for -XX:FreqInlineSize / -XX:CompileCommand=inline, runtime knobs a PR cannot ship) and note @ForceInline only as unavailable. - describePaths capped in diff order, so a test-heavy PR could name ten test files the rule scopes out and no production path. Stable-partition production first. - Header: a rule earns its place by naming an invisible defect AND pays a per-agent token cost; say so, before rule #3 arrives. - Nits: HashMap.newHashMap(n) (JDK 19+) for the presize arithmetic; the split fast path also covers the escaped two-char form. - Coverage probes (inline): the correctness-traps block and the nine Suggestion patterns had zero test coverage — deletion left all tests green. Pin the load-bearing strings of both, plus the new tier flags and the production-first ordering.
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Second round addressed in #1 ( #2 ( #3 (won't compile) — fixed, incorporating the inline comment's concrete classpath path. The tier now names #4 ( #5 (cap ordering) — fixed. #6 (budget header) — fixed. Added the line to the file header: a rule earns its place by naming an invisible defect and pays a per-agent token cost, so "a rule that does not earn its tokens on the median matching diff is not a rule" — the precedent before rule #3. Nits — all fixed. Coverage probes (the three inline comments) — fixed. Both probes were right: the correctness-traps block and the nine Suggestion patterns had zero coverage (deletion left everything green). Added tests pinning the load-bearing strings of each — |
Review: Java/JVM performance path ruleOverviewAdds The shape is right. It mirrors the Fact-check — the numbers hold. I ran Every cited value matches, and The findings below are all in the measurement procedure — the part the whole section's credibility rests on. Major1. The The same paragraph that says
then prescribes:
"Without compiling" is true. "Without running" is not, in the sense that matters here. Any Maven invocation on a contributor-controlled branch loads Secondary: Suggest either dropping the 2. The prescribed command uses the agent's default JDK. Projects pin a target. Same source, four That is one method with five The fix is one clause: read the target level from the project ( 3. On a Lombok project, Minor
Not a concern
VerdictComment. The domain content is accurate and well-scoped — I verified the flag table, the |
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Reviewed — no blockers. Suggestions are inline.
中文说明
已审查——无阻断问题。 建议见行内评论。
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| const out = pathRulesFor(['src/Main.java']); | ||
| expect(out).toContain('mktemp -d'); | ||
| expect(out).toContain('-proc:none'); | ||
| expect(out).toContain('dependency:build-classpath'); |
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[Suggestion] This assertion pins the checklist's mvn dependency:build-classpath recommendation (in path-rules.ts), but that recommendation is in tension with the threat model this test itself documents. Maven core extensions — declared via <extensions> in pom.xml or .mvn/extensions.xml — load during any Maven invocation, before any goal runs, so dependency:build-classpath still executes them. — Failure scenario: a malicious PR adds a .java file (triggering the rule) plus a .mvn/extensions.xml build extension; a review agent following the checklist's explicit recommendation runs mvn dependency:build-classpath and thereby executes the attacker's extension with the agent's privileges — the same untrusted-code-execution hazard the checklist elsewhere closes for annotation processors (-proc:none) and tree mutation (git show instead of git checkout). The prohibition "never … run mvn/gradle to force a compile" does not cover a dependency-resolution goal. Suggested fix: drop the mvn dependency:build-classpath recommendation and fall straight to the mechanism-at-Confidence: low tier when no pre-built classpath exists — or warn in the same sentence that Maven extensions execute during any mvn invocation (contributor-controlled) and must be verified absent first.
中文说明
这个断言固定了清单里 mvn dependency:build-classpath 的建议（位于 path-rules.ts），但该建议与本测试自身记录的威胁模型相冲突。Maven 核心扩展——通过 pom.xml 的 <extensions> 或 .mvn/extensions.xml 声明——会在任何 Maven 调用期间、在任何 goal 运行之前加载，因此 dependency:build-classpath 同样会执行它们。— 失败场景：恶意 PR 添加一个 .java 文件（触发该规则）外加一个 .mvn/extensions.xml 构建扩展；遵循清单明确建议的审查 agent 运行 mvn dependency:build-classpath，即以 agent 权限执行了攻击者的扩展——与清单在别处为注解处理器（-proc:none）和树变更（用 git show 而非 git checkout）所封堵的同一类不可信代码执行风险。禁令"绝不……运行 mvn/gradle 以强制编译"并未覆盖依赖解析这类 goal。建议修复：去掉 mvn dependency:build-classpath 建议，在没有预构建 classpath 时直接退回到 Confidence: low 的机制档——或者在同一句中警告：Maven 扩展会在任何 mvn 调用期间执行（贡献者可控），必须先确认其不存在。
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🤝 Takeover engaged: the autofix loop now manages this PR — it will address new review feedback and resolve base conflicts until the label is removed or the round cap is reached. Remove the 中文说明🤝 已接管：autofix 循环现在管理此 PR —— 将持续处理新的评审反馈与 base 冲突，直到移除标签或达到轮次上限。移除 |
Drop the mvn dependency:build-classpath recommendation — Maven extensions execute during any invocation, a strictly larger execution surface than the annotation processors -proc:none exists to close. Fall through to the mechanism tier when no pre-built classpath exists. Add --release <N> at the project's target level: the same source compiles to different bytecode at different levels (61 vs 16 bytes for a five-+ concatenation), so measuring without it produces a threshold verdict on bytecode the shipped artifact does not contain. Name -proc:none as a fidelity hazard: on a Lombok/Dagger project the compiled class is missing generated members, so the static tier is void. Add clauses for new files (no base side to compare), the base-side target/classes caveat, and the Windows uniqueness primitive. Fix the vacuous ordering assertion (indexOf returns -1 outside the cap, and -1 < n passes). Add a GHA cap test and a --release/new-file test.
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🤖 Addressed the latest review feedback (round 1/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 1/100 轮）。改动内容与我反驳保留之处如下： Round 3 — addressed in
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Review —
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| JDK (x86_64, default flags) | effective InlineSmallCode |
source |
|---|---|---|
| 8 | 2000 | advancedThresholdPolicy.cpp — #if defined(X86) || defined(AARCH64) → 2000 |
| 11 | 2000 | tieredThresholdPolicy.cpp — #ifdef X86 → 2000 (SPARC/AArch64 → 2500) |
| 17 / 21 / 26 | 2500 | compilerDefinitions.cpp — #if defined(X86) || defined(AARCH64) || defined(RISCV64) → 2500 |
any, with -XX:-TieredCompilation |
1000 | globals_x86.hpp pd default |
So "2500 on JDK 11+" is only true from 17 onward on x86 (it was 2500 on JDK 11 AArch64, which is presumably where the number came from), and "1000 on JDK 8" is off by 2× for anyone not running with tiered compilation disabled — i.e. essentially everyone. Verified on this machine: java -XX:+PrintFlagsFinal -version | grep InlineSmallCode → 2500 {C2 pd product} {default} on JDK 26, matching the mainline compilerDefinitions.cpp path.
This matters more here than it would anywhere else: this is the one checklist in the repo whose thesis is don't state a number you didn't measure, cited to agents that will paste it into someone else's PR. The existing test comment at path-rules.test.ts:150-155 says three numbers were already corrected once after being measured against a live JVM — this one slipped through because the measurement was on a modern JDK and the JDK-8/11 halves were inferred, which is exactly the failure mode the section warns about.
Suggested wording:
…whose native size passes
InlineSmallCode(x86_64 default: 2500 on JDK 17+, 2000 on JDK 8–11; 1000 only with-XX:-TieredCompilation)
path-rules.test.ts:157 pins '2500 on JDK 11+' and has to change with it.
2. A test-only Java diff pays the full 11.6 KB (suggestion)
matches: (p) => /\.java$/i.test(p) fires on src/test/**/*.java, but the checklist then tells the agent that test sources are out of scope for everything the JIT and hot-path sections exist to find. A chunk agent whose territory is entirely test classes — routine on a PR that adds tests for a small production change — receives ~2.9k tokens of checklist and is told, three paragraphs in, that most of it doesn't apply to anything it can see.
The new comment at path-rules.ts:32-34 sets the bar this trips over ("a rule that does not earn its tokens on the median matching diff is not a rule"). describePaths already has the predicate; the cheap fix is to reuse it in activation — e.g. keep matches as the membership test for the heading, and skip the rule entirely when no matching path is production. The correctness traps (shared SimpleDateFormat, get-then-put) do have some value in test helpers, so this is a judgement call rather than an obvious win — but it's worth making deliberately rather than by omission.
3. describePaths deprioritizes only src/test/ (suggestion)
path-rules.ts:140-141 filters on /src\/test\//i, but the checklist scopes out three more categories that can equally flood the ten named slots on a real PR: generated sources (target/generated-sources/**, build/generated/**, **/generated/**), package-info.java / module-info.java, and non-Maven test roots (src/integTest/, src/androidTest/, src/testFixtures/). A code-generation PR that regenerates 300 stubs and edits two hot production methods will name ten generated files and hide both real ones behind "…and 292 more" — the precise failure the prod-before-test ordering was added to prevent. One shared isOutOfScope(path) predicate covering all four categories, used by both the ordering and (per #2) the activation gate, would fix both.
4. Nits
--releasebyte counts don't reproduce. The parenthetical says "a five-+concatenation is 61 bytes at release 8 and 16 at 11+". Measured here withjavac --release N -proc:none+javap -c -p: an all-Stringfive-+concat is 37 bytes at release 8 and 14 at 11; with mixedint/long/Objectoperands, 37 and 17. The 16 looks like the last-instruction offset without its width added — which would contradict the procedure the same paragraph prescribes two sentences later. The direction and the point are right; either recompute against a named expression or drop the specific numbers, since this rule gets read by agents that will quote them.- Indy string concat is release 9+, not 11+. JEP 280 shipped in JDK 9, so
--release 9and10also produce themakeConcatWithConstantsform. "11+" isn't false, just narrower than the real boundary. - Cost, for the record. The
JAVAchecklist is 11.6 KB (~2.9k tokens) vs 6.9 KB forGITHUB_ACTIONS, injected into up to nine agents → ~26k tokens on any Java review, of which the JIT section is roughly 60% and is unusable unless the class compiles. The A/B evidence justifies it; noting it so the number is on the record next time a rule is proposed.
Not issues
- Applying the cap to
GITHUB_ACTIONStoo is the right call and is tested. -proc:noneframed as both a security control and a fidelity control ("the static tier is void" on a Lombok/Dagger class) is the sharpest part of the measurement procedure — that second reading is the one most reviewers would have missed.- No brief-size cap exists downstream, so nothing silently truncates the checklist. Confirmed in
agent-prompt.ts.
Verdict
Request changes, on #1 alone — a wrong constant in a checklist whose entire authority rests on not guessing constants is the finding that gets the whole rule dismissed by the first Java maintainer who checks it. #2 and #3 are cheap and worth folding into the same push; #4 is optional.
Local verification report — real environment, real JVMsI rebuilt this branch and ran the checklist's own procedure end to end, rather than reading it. Because the rule's whole thesis is measure, don't estimate, I held it to that standard: every number it cites was measured on a real JVM, and the tier-1 procedure was executed verbatim against a synthetic base/head pair. Verdict: the mechanism works and the injection is correctly scoped. Two factual defects found — one wrong constant, one safety carve-out that does not hold. Neither blocks merge in my view; both are one-line edits to the checklist text. Environment
1. The measurement procedure — run verbatim, not readI built a base/head pair where the PR-shaped change (added validation, sign/decimal/exponent handling — all cold branches) grows one hot method, then executed tier 1 exactly as the checklist writes it:
2. Injection and scopingPlans built by the real
3. Every cited constant, measured
Confirmed: Two results worth calling out because they are the corrections this PR made in its third commit, and both hold exactly:
4. The tier-1 safety rules, against a hostile branch
I wrote an annotation processor that writes a file and prints a banner, put it on the classpath, and compiled a victim class on four JDKs. On JDK 11, 17 and 21 a bare Findings🔸 1.
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| JDK | 8 | 11 | 17 | 21 | 25 | 26 |
|---|---|---|---|---|---|---|
| default (tiered) | 2000 | 2500 | 2500 | 2500 | 2500 | 2500 |
-XX:-TieredCompilation |
1000 | 1000 | 1000 | 1000 | 1000 | 1000 |
1000 is not the JDK 8 value — it is the non-tiered value, and it is 1000 on every version including JDK 26. The platform-dependent default in globals_<arch>.hpp is 1000 (identical on x86 and aarch64); tiered compilation, which is on by default, overwrites it — to 2500 in shared code (compilerDefinitions.cpp, guarded by COMPILER2 && _LP64), and to 2000 on JDK 8. So the parenthetical attaches a tiered/non-tiered distinction to the version axis, and states 1000 for the one configuration nobody runs.
This matters more than the size of the error, because it is the same class of defect this PR's third commit already fixed once (the pre-JDK-11 value), on a checklist whose credibility rests on not citing unmeasured numbers.
Suggested: (2500 on JDK 11+ and 2000 on JDK 8 under the default tiered compilation; 1000 only with -XX:-TieredCompilation).
Measured on aarch64; the pd source default is identical for x86, and the override lives in shared code, so this is not platform-specific.
🔸 2. mvn dependency:build-classpath still executes contributor code
mvn dependency:build-classpath ...writes the dependency classpath without compiling or running the project
The "without compiling" half is correct — I confirmed no target/classes is produced. The "without running" half does not hold. A pom.xml that declares a <build><extensions> entry makes Maven load and execute that extension before any goal runs. I built one (AbstractMavenLifecycleParticipant), installed it into a scratch local repo, and ran the exact command from the checklist:
>>> [Evil Maven extension] EXECUTED during a goal that 'does not compile or run the project' <<<
[INFO] BUILD SUCCESS
target/classes -> NO arbitrary code executed -> YES
The rule prohibits mvn/gradle precisely because "the branch's build logic is contributor-controlled — the attack surface", and then carves out this one mvn goal as the safe escape. On a stranger's PR branch that carve-out is an arbitrary-code-execution path, reached by following the checklist correctly.
Suggested: keep the goal (it is genuinely the cheapest way to resolve a classpath) but describe it accurately — it does not run the compile phase, but it does read the branch's pom.xml and load any declared build extensions, so it is still contributor-controlled execution; prefer -sourcepath / an existing target/classes, and fall to the mechanism-at-Confidence: low tier rather than reaching for it on an untrusted branch.
One observation, not a defect
The checklist is ~10.3 KB, ≈2,590 tokens, and it rides in 12 briefs — so a Java PR pays roughly 31k tokens before any agent reads a line of the diff. That is the cost the file's own new header comment names ("a rule that does not earn its tokens on the median matching diff is not a rule"), and on a real Java diff I think it clears that bar comfortably.
The edge case worth knowing: a PR touching only src/test/**/*.java still attaches the full checklist to all 12 agents, even though its scoping paragraph puts test sources out of scope for the hot-path items. describePaths correctly demotes test paths in the heading (verified: production first, then tests), but the rule still fires. Cheap to leave as is; just worth a conscious decision.
Also minor: the src/test/ filter in describePaths is Maven/Gradle-shaped — src/integrationTest/, src/testFixtures/ and androidTest/ are treated as production for heading-ordering purposes. That is consistent with the checklist body, which also only names src/test/**, so it is at most a nit.
Recommendation: merge after fixing the two constants/claims above. The mechanism, the scoping, the measurement discipline and the two second-round corrections all hold up under real execution.
中文版本
本地验证报告 —— 真实环境、真实 JVM
我重新构建了这个分支，并把清单里写的流程逐字执行了一遍，而不是只读它。既然这条规则的核心论点是「测量，而非估算」，我就按同样的标准要求它：它引用的每一个数字都在真实 JVM 上实测过，tier-1 流程也在一对合成的 base/head 上原样跑通。
结论：机制有效，注入作用域正确。发现两处事实性缺陷 —— 一个常量写错，一处安全豁免不成立。 在我看来都不阻塞合并；两处都是清单文本里的一行修改。
环境
| Head / merge-base | cd94347 / 4379755 |
| 构建 | PR head 上 npm ci && npm run build，干净通过 |
| JDK | Zulu OpenJDK 8.0.502 / 11.0.32 / 17.0.20 / 21.0.12 / 25.0.4 / 26.0.2，macOS aarch64 |
| Maven | 3.9.x，使用隔离的本地仓库（-Dmaven.repo.local） |
| Plan | 由构建出的 CLI 自身的 qwen review capture-local 针对临时 git 仓库生成 |
1. 测量流程 —— 逐字执行
我造了一对 base/head：PR 形态的改动（新增校验、正负号/小数点/指数处理，全是冷分支）让一个热方法膨胀。然后完全按清单写法执行 tier 1：SCRATCH=$(mktemp -d)、git show <base>:<path>、javac -proc:none、javap -c -p，尺寸 = 最后一条指令的 offset + 该指令宽度。
parseAmount实测 56 → 483 字节，跨过FreqInlineSize325。- Tier 2（
-XX:+PrintInlining）报出同样的 56 和 483 —— 清单规定的 javap 算法与 JVM 自报数字逐字节一致。 - base →
inline (hot)；head →failed to inline: hot method too big。后者正是清单让 agent 去 grep 的两个字符串之一。 - 测完两侧后
git status：干净。没有 checkout、没有 stash、没有就地构建。
2. 注入与作用域
用真实的 capture-local 从混合 diff（.java 生产代码 + .java 测试 + .ts + workflow）生成 plan，再跑 agent-prompt --roster。
- 13 个 brief 中有 12 个带上清单；
7.brief.md（构建/测试）没有 —— 与「每个代码审查 agent」一致。 - 两条 path rule 在同一个 diff 上叠加。
- 8-chunk plan 上：dimension agent 拿到全部 3 个 Java 文件，
chunk-1只拿自己的 2 个，chunk-2只拿 1 个，6 个 TypeScript chunk 什么都没拿到。 - 负控制 —— 纯 TypeScript diff：
grep -c→ 0。 - 单测：33 个全过（
path-rules.test.ts）。PR 描述写的 29 是最后一个 commit 之前的数。
3. 所有引用常量的实测
已确认：MaxTrivialSize 6、MaxInlineSize 35、FreqInlineSize 325（OpenJDK 源码中 x86 与 aarch64 完全一致，jdk8u 到当前版本皆然）、DontCompileHugeMethods 作为 product 门控、split fast-path 条件（与 String.java 逐字吻合）、HashMap.newHashMap（JDK 17 无、JDK 21 有）。
有两项特别值得点出，因为它们正是本 PR 第三个 commit 做的修正，而且完全成立：
- 是
> 8000而非>= 8000。 我生成了字节码尺寸恰好为 8000 和 8001 的方法。8000 字节的会被 JIT 编译；8001 字节的永远不编译；加上-XX:-DontCompileHugeMethods后 8001 那个又能编译了。边界被钉死。 - megamorphic 且有主导 receiver。 3 个实现的调用点，某一个占 98% →
inline (hot)，TypeProfile (425670/434358)。同一个调用点均分 33/33/33 →failed to inline: virtual call。修正后的措辞完全正确。
4. tier-1 安全规则，对抗恶意分支
我写了一个注解处理器（写文件 + 打印横幅），放到 classpath 上，在四个 JDK 上编译一个受害类。JDK 11、17、21 上裸 javac 会执行它。 JDK 22+ 默认关闭了隐式注解处理，所以 JDK 26 不会 —— 但 -proc:none 是唯一在所有版本上都安全的形式。「-proc:none 不是可选项」这句话正确且关键。
发现
🔸 1. InlineSmallCode —— 「JDK 8 上是 1000」挂错了坐标轴
InlineSmallCode（JDK 11+ 是 2500，JDK 8 是 1000）
默认配置下实测：
| JDK | 8 | 11 | 17 | 21 | 25 | 26 |
|---|---|---|---|---|---|---|
| 默认（分层编译） | 2000 | 2500 | 2500 | 2500 | 2500 | 2500 |
-XX:-TieredCompilation |
1000 | 1000 | 1000 | 1000 | 1000 | 1000 |
1000 不是 JDK 8 的值 —— 它是非分层编译的值，而且在每个版本上都是 1000，包括 JDK 26。globals_<arch>.hpp 里的平台相关默认值确实是 1000（x86 与 aarch64 一致）；但默认开启的分层编译会改写它 —— 在共享代码 compilerDefinitions.cpp 中改成 2500（由 COMPILER2 && _LP64 保护），JDK 8 上改成 2000。所以这个括号把分层/非分层的区别挂到了版本坐标轴上，而且给出的是没人会跑的那个配置下的数。
这件事的重要性超过误差本身：它与本 PR 第三个 commit 已经修过一次的缺陷（pre-JDK-11 的旧值）属于同一类，而这份清单的公信力恰恰建立在「不引用未经测量的数字」之上。
建议改为：（默认分层编译下 JDK 11+ 为 2500、JDK 8 为 2000；只有 -XX:-TieredCompilation 时才是 1000）。
在 aarch64 上实测；pd 源码默认值 x86 相同，且改写发生在共享代码中，因此与平台无关。
🔸 2. mvn dependency:build-classpath 仍会执行 contributor 的代码
mvn dependency:build-classpath ...写出依赖 classpath，不编译也不运行项目
「不编译」这一半正确 —— 我确认没有产生 target/classes。「不运行」这一半不成立。只要 pom.xml 声明了 <build><extensions>，Maven 就会在任何 goal 执行之前加载并运行该扩展。我构建了一个（AbstractMavenLifecycleParticipant），安装到隔离的本地仓库，然后跑清单里的原命令：
>>> [Evil Maven extension] EXECUTED during a goal that 'does not compile or run the project' <<<
[INFO] BUILD SUCCESS
target/classes -> NO arbitrary code executed -> YES
这条规则禁止 mvn/gradle，理由恰恰是「分支的构建逻辑由 contributor 控制 —— 那是攻击面」，然后又把这一个 mvn goal 作为安全出口豁免掉。在陌生人的 PR 分支上，这个豁免就是一条任意代码执行路径，而且是正确遵循清单就会走到的。
建议：保留这个 goal（它确实是解析 classpath 最省的办法），但把话说准 —— 它不跑 compile 阶段，但它会读取分支的 pom.xml 并加载其中声明的 build extension，所以仍属 contributor 控制的代码执行；优先用 -sourcepath / 已存在的 target/classes，在不可信分支上宁可退回到 mechanism-at-Confidence: low 那一档，也不要伸手去用它。
一点观察（不是缺陷）
清单本体 约 10.3 KB、≈2,590 tokens，会进入 12 个 brief —— 也就是说一个 Java PR 在任何 agent 读到 diff 第一行之前，就先付出约 31k tokens。这正是该文件新增的头部注释自己点名的成本（「在中位匹配 diff 上赚不回 token 的规则就不算规则」）。在真实的 Java diff 上，我认为它明显达标。
值得知道的边界情况：只改 src/test/**/*.java 的 PR 仍会把完整清单挂到全部 12 个 agent 上，尽管它自己的作用域段落把测试源码排除在热路径条目之外。describePaths 确实在标题里正确地把测试路径降序（已验证：生产在前、测试在后），但规则本身照样触发。保持现状成本很低，只是值得有意识地做个决定。
另有小点：describePaths 里的 src/test/ 过滤是 Maven/Gradle 形状的 —— src/integrationTest/、src/testFixtures/、androidTest/ 在标题排序上会被当作生产代码。这与清单正文一致（正文也只点名 src/test/**），所以至多算个 nit。
建议：修掉上述两处常量/说法后合并。 机制、作用域、测量纪律、以及第二轮的两处修正，在真实执行下全部站得住。
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No issues found. LGTM! ✅
中文说明
未发现问题。LGTM！✅
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|
🤖 Addressed the latest review feedback (round 2/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 2/100 轮）。改动内容与我反驳保留之处如下： Round 4 — addressing @wenshao's review1.
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Reviewed the current head. I found one correctness issue in the JVM guidance and one path-scoping gap; details are inline. I did not approve because the first issue can cause /review to report an inlining regression that did not occur.
中文说明
已审查当前 head。发现一处 JVM 指导的正确性问题和一处路径作用域遗漏，详见行内评论。由于第一处可能导致 /review 报告并不存在的内联回归，本轮未批准。
| | callee bytecode size | inlinable | | ||
| | --- | --- | | ||
| | ≤ 6 (\`MaxTrivialSize\`) | always | | ||
| | ≤ 35 (\`MaxInlineSize\`) | even when cold | |
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[Critical] Treat these values as size caps, not inlining outcomes. MaxInlineSize only selects the normal size ceiling; C2 can still reject a <=35-byte callee because the call site was never executed, has low frequency, exceeds the inlining depth/recursion limits, or hits the node-count cutoff. I reproduced this on the default JDK 21 with a 10-byte callee reached from 0.1% of calls to a hot caller: level-4 compilation printed low call site frequency, contradicting even when cold. The static tier below then makes this consequential: it treats a javap size comparison as one of the two sufficient verification tiers, so a 300→330-byte method that was already not inlined for another reason can be reported as a new “can no longer be inlined” regression. Please label this table as C2 normal-policy size caps, remove always / even when cold / never, and state that static measurement proves only a size-gate crossing; an actual before/after inlining claim needs PrintInlining or equivalent runtime evidence. OpenJDK's policy shows the independent never executed and low call site frequency rejections here: https://github.com/openjdk/jdk/blob/5b2d6991a1279d375f9a3c00c7bcd0bbcc7081d6/src/hotspot/share/opto/bytecodeInfo.cpp#L293-L325
中文说明
这些数值应描述为 size cap，而不是内联结果。MaxInlineSize 只决定常规大小上限；即使 callee 不超过 35 字节，C2 仍会因调用点未执行、频率过低、内联/递归深度或节点数限制而拒绝。我在默认 JDK 21 上用一个 10-byte callee 复现：它只在 hot caller 的 0.1% 调用中出现，level-4 编译明确输出 low call site frequency，与 even when cold 矛盾。下方静态档又把 javap 尺寸对比当作足够的验证档，因此一个 300→330 bytes、但 base 本来就因其他限制未内联的方法，会被误报成新的“无法再内联”回归。建议把表改成 C2 常规策略的 size caps，删掉 always / even when cold / never，并明确静态档只能证明跨过大小门槛；实际前后内联状态必须用 PrintInlining 或等价运行证据确认。
| */ | ||
| function isOutOfScope(p: string): boolean { | ||
| return ( | ||
| /src\/(test|integTest|androidTest|testFixtures)\//i.test(p) || |
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[Suggestion] The previous integrationTest case was fixed as a different directory name. The earlier review called out Gradle's conventional src/integrationTest/java path, but this regex adds only integTest. With 12 src/integrationTest/java/T*.java paths followed by src/main/java/Hot.java, describePaths treats every test as production, fills all ten heading slots with tests, and truncates Hot.java into …and 3 more; that defeats the production-first cap this helper exists to provide. Gradle documents src/integrationTest/java as the conventional directory for a suite named integrationTest: https://docs.gradle.org/current/userguide/jvm_test_suite_plugin.html. Please include integrationTest and add a regression with more than ten such paths plus one production path; the current test uses integTest and does not exercise this failure.
中文说明
上一轮点名的是 Gradle 常用的 src/integrationTest/java，这里却只加入了另一个目录名 integTest。实测 12 个 src/integrationTest/java/T*.java 后跟一个 src/main/java/Hot.java 时，所有测试文件都会被当成生产路径并占满标题前十个槽位，Hot.java 被截进 …and 3 more，破坏了此 helper 的“生产路径优先”目标。建议补上 integrationTest，并增加一个 10+ 测试路径加一个生产路径的回归测试；当前测试只用了 integTest，覆盖不到这个失败。
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LGTM — well-researched rule that fills a real gap. Path matching correct (*.java triggers, .kt/.java.md rejected), JVM thresholds verified against openjdk/jdk master globals.hpp (MaxTrivialSize=6, MaxInlineSize=35, FreqInlineSize=325, HugeMethodLimit=8000), severity classification sound (Critical for correctness traps, Suggestion for cost defects), measure-don't-estimate discipline correctly stated with two verification tiers. Test coverage excellent (246 lines, all thresholds, stacking, self-restraint clauses, measurement safety).
Non-blocking:
- (P2) HugeMethodLimit is described as 'a develop flag' — this was true in JDK 8 but it was promoted to a product flag in modern JDKs (jdk17u and master globals.hpp both have product(intx, HugeMethodLimit, 8000, ...)). Suggest dropping the flag-type claim or changing to 'a product flag (develop before JDK 11)'.
- (P3) InlineSmallCode defaults: declared default in globals.hpp is 1000 across all versions; the 2000/2500 figures are likely ergonomic overrides in arguments.cpp. Consider adding a source citation or softening to 'check with -XX:+PrintFlagsFinal'.
- (P3) generated-path regex matches any path segment named 'generated' including legitimate packages like com.example.generated — low impact (heading ordering only).
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Reviewed. Suggestions are inline.
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| /** | ||
| * The triggering paths named in a rule's heading — capped. A workflow rule | ||
| * matches one or two files; a Java rule matches every source file in a large | ||
| * PR, and listing hundreds of paths in the heading of every agent's brief is | ||
| * ~11 KB of a list the agent already has from its file table. Name the first | ||
| * few and a count; the checklist, not the path list, is what the heading is | ||
| * for. | ||
| */ | ||
| function isOutOfScope(p: string): boolean { |
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[Suggestion] The JSDoc block above is attached to isOutOfScope but describes describePaths (line 143) — the function that actually caps and lists paths. isOutOfScope classifies a single path; it caps nothing.
Failure scenario: IDE hover on isOutOfScope shows documentation about "Name the first few and a count" — behaviour the function does not have. Meanwhile describePaths has no JSDoc at all, so its rationale (why 10, why production-first) is invisible without reading isOutOfScope's misattached comment first.
Move this JSDoc block to above describePaths.
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| function isOutOfScope(p: string): boolean { | ||
| return ( | ||
| /src\/(test|integTest|androidTest|testFixtures)\//i.test(p) || | ||
| /(?:^|\/)(?:package-info|module-info)\.java$/i.test(p) || | ||
| /(?:^|\/)generated(?:-sources)?\//i.test(p) | ||
| ); | ||
| } |
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[Suggestion] describePaths — the heading formatter called by every rule — silently reorders paths through isOutOfScope, which encodes Java/Maven-specific conventions behind a language-agnostic name. A future rule for any other ecosystem whose paths happen to contain generated/ or src/test/ will have its heading silently reordered without the rule author's knowledge.
Failure scenario: a Kotlin or Scala rule added later would have generated-source paths like build/generated/com/x/R.kt silently relegated to the tail of the heading by this function, with no test covering the interaction. The rule author sees no mention of these files and does not notice the deprioritization.
Suggested fix: add an optional isDeprioritized?(path: string): boolean method to the PathRule interface and make describePaths accept the rule's predicate, so deprioritization is opt-in per rule rather than a shared default.
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Declined for this round, with respect — the direction is sound but premature here. The suggested isDeprioritized?(path) hook makes deprioritization opt-in per rule, yet today only two rules exist and the only non-Java rule (GitHub Actions) matches .github/workflows/** and .github/actions/** paths — none of which isOutOfScope ever deprioritizes (no src/test/, no build-output generated/, no info-only file). So no current rule is mis-served by the shared heuristic, and the hook would be an abstraction with zero consumers. Per the repo's Simplicity First rule (no configurability that was not requested, no abstraction for single-use code), I deferred it until a second ecosystem rule (e.g. Kotlin/Scala) actually lands; at that point the opt-in predicate is justified and this is a small change. The naming concern is partly mitigated because isOutOfScope mirrors the checklist's own "out of scope" terminology.
中文说明
本轮暂缓，方向是对的，但现在做偏早。建议的 isDeprioritized?(path) 钩子让降序按规则可选，可目前只有两条规则，唯一的非 Java 规则（GitHub Actions）只匹配 .github/workflows/** 和 .github/actions/** 路径——这些路径里没有任何 src/test/、构建产物 generated/ 或纯信息文件，isOutOfScope 根本不会对它们降序。所以当前没有任何规则被这个共享启发式误伤，这个钩子会是零消费者的抽象。按仓库的 Simplicity First 原则（不加没人要求的 configurable、不为单次使用的代码做抽象），我把它推迟到第二条生态规则（如 Kotlin/Scala）真正落地时再做；到那时可选谓词才名正言顺，改动也很小。命名上的担忧已部分缓解：isOutOfScope 与清单正文里 "out of scope" 的措辞是一致的。
| return ( | ||
| /src\/(test|integTest|androidTest|testFixtures)\//i.test(p) || | ||
| /(?:^|\/)(?:package-info|module-info)\.java$/i.test(p) || | ||
| /(?:^|\/)generated(?:-sources)?\//i.test(p) |
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[Suggestion] The regex /(?:^|\/)generated(?:-sources)?\//i matches any path containing generated/ as a directory component — including legitimate source files in a package named generated (e.g. src/main/java/com/x/generated/Proto.java). The test at line 284 pins this as "noise", but generated is a valid Java package name.
Failure scenario: a PR modifies a hot-path class in src/main/java/com/x/generated/HotPath.java. The file is deprioritized by describePaths and may not appear in the capped heading when 10+ other paths exist, even though it is the most important file for the performance checklist.
| /(?:^|\/)generated(?:-sources)?\//i.test(p) | |
| /(?:^|\/)(?:target|build)\/(?:generated-sources|generated)\//i.test(p) |
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Reviewed — no blockers. Suggestions are inline.
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已审查——无阻断问题。 建议见行内评论。
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| expect(heading.indexOf('Hot.java')).toBeLessThan( | ||
| heading.indexOf('Stub.java') === -1 | ||
| ? Infinity | ||
| : heading.indexOf('Stub.java'), | ||
| ); |
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[Suggestion] This test does not discriminate most of the isOutOfScope branches its comment claims to pin. Mutation-verified: deleting the integTest|androidTest|testFixtures alternatives and the entire package-info|module-info branch from isOutOfScope leaves all 36 tests green.
Failure scenario: the test feeds only 9 paths (< CAP = 10), so describePaths lists every path regardless of how it partitions them — truncation never bites. The sole ordering assertion compares Hot.java against Stub.java (a generated-sources path — the one branch the test does catch), and the === -1 ? Infinity : guard is dead code because Stub.java is always present. A future edit dropping integTest|androidTest|testFixtures or package-info|module-info from isOutOfScope then ships with a green suite; on a Gradle/Android PR whose first ten changed .java files are test-fixture/info-only sources, the heading's ten named slots fill with out-of-scope files and the production path hides behind …and N more.
Give the test the same shape as its effective sibling (the production-before-test test): push the noise paths past the cap so truncation bites, then assert the prod path survives and a trailing noise path does not:
const noise = [
'src/integTest/java/com/x/IT1.java',
'src/androidTest/java/com/x/AT1.java',
'src/testFixtures/java/com/x/TF1.java',
'src/main/java/com/x/package-info.java',
// …about 12 noise paths total…
];
const heading = pathRulesFor([...noise, 'src/main/java/com/x/Hot.java']);
expect(heading).toContain('Hot.java');
expect(heading).toContain('…and'); // truncation now bitesThat input makes each branch's removal drop Hot.java from the heading and fail.
中文说明
[Suggestion] 此测试无法区分其注释声称要固定的 isOutOfScope 的大多数分支。经变异验证：从 isOutOfScope 中删除 integTest|androidTest|testFixtures 备选项以及整个 package-info|module-info 分支后，全部 36 个测试仍然通过。
失败场景： 该测试只喂入 9 条路径（< CAP = 10），因此 describePaths 无论怎样分区都会列出每一条路径——截断从不生效。唯一的排序断言比较 Hot.java 与 Stub.java（一条 generated-sources 路径——测试确实能捕获的那一个分支），而 === -1 ? Infinity : 守卫是死代码，因为 Stub.java 始终存在。因此，未来任何从 isOutOfScope 中删除 integTest|androidTest|testFixtures 或 package-info|module-info 的改动都会带着绿色测试套件上线；在一个 Gradle/Android PR 上，若前十个改动的 .java 文件都是测试 fixture / 仅信息类源码，标题的十个命名槽位就会被范围外文件填满，而生产路径被藏在 …and N more 之后。
请给该测试与其有效兄弟（生产路径优先测试）相同的形态：把噪声路径推过上限使截断生效，然后断言生产路径存活而尾部噪声路径不存活（见上方代码示例）。该输入会使任一分支被删除时 Hot.java 从标题中消失从而测试失败。
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🤖 Addressed the latest review feedback (round 3/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 3/100 轮）。改动内容与我反驳保留之处如下： Fifth-round review — summaryAddressed the one Critical and four Suggestions from @doudouOUC, plus the two factual findings in @wenshao's local verification report. One Suggestion was declined with a recorded reason (reply on its thread). No conflict ( Findings and dispositions[Critical] rc:3699732084 — size table read as inlining outcomes — FIXED. Reframed the JIT table as C2 normal-policy size caps: the column header is now "C2 normal-policy size cap", and the outcome words [Suggestion] rc:3699732088 — Gradle [Suggestion] rc:3699800759 — JSDoc misattached to [Suggestion] rc:3699800762 — make deprioritization opt-in per rule — DECLINED. See the reply on the thread. In short: only two rules exist and the non-Java one matches only [Suggestion] rc:3699800765 — @wenshao 🔸1 — @wenshao 🔸2 — @wenshao observation (not a defect) — a test-only PR still attaches the full checklist — LEFT AS IS (conscious decision). The reviewer flagged this as "cheap to leave as is; just worth a conscious decision," not a defect. The rule firing conservatively on a test-only Java PR is acceptable: Files changed
Conflict notesNone — Verification
中文说明第五轮审查 —— 小结处理了 @doudouOUC 提出的 1 处 Critical 和 4 条 Suggestion，以及 @wenshao 本地验证报告中的两处事实性发现。其中 1 条 Suggestion 附带理由暂缓（已在对应线程回复）。无冲突（ 各项发现与处置[Critical] rc:3699732084 —— 尺寸表被当成内联结果 —— 已修复。 把 JIT 表重新表述为 C2 常规策略的 size cap：列标题改为 “C2 normal-policy size cap”，并删掉了 [Suggestion] rc:3699732088 —— Gradle 的 [Suggestion] rc:3699800759 —— JSDoc 错挂在 [Suggestion] rc:3699800762 —— 让降序按规则可选 —— 暂缓。 见线程回复。简言之：目前只有两条规则，唯一的非 Java 规则只匹配 [Suggestion] rc:3699800765 —— @wenshao 🔸1 —— @wenshao 🔸2 —— @wenshao 的观察（非缺陷）—— 只改测试的 PR 仍会挂上完整清单 —— 保持现状（有意识的决定）。 评审者把它定性为“保持现状成本很低，只是值得有意识地做个决定”，并非缺陷。规则在只改测试的 Java PR 上保守触发是可以接受的： 改动文件
冲突说明无 —— 验证
Base-conflict check · 基分支冲突检查: no conflict with main. · 与 main 无冲突。 Re-review when you have a moment. After round 100 this bot stops and leaves the PR for a human. · 有空请复审；第 100 轮后本 bot 停止并将 PR 交给人工。 🧠 Handled by Qwen Code · model/模型 |
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🤖 Addressed the latest review feedback (round 4/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 4/100 轮）。改动内容与我反驳保留之处如下： Autofix review round — PR #8379One inline finding this round; it is resolved in code and verified by mutation Feedback
DiagnosisConfirmed the reviewer's mutation argument against the exact code. The old test ChangeReshaped the test into the same truncation-bites form as its effective sibling
Mutation verificationTemporarily mutated
With the source restored, all 41 tests in the file pass. Conflict notesNone — Verification
中文说明Autofix 审查轮次 — PR #8379本轮有一条行内发现，已在代码中解决并通过变异测试验证。 反馈
诊断针对确切代码核实了审查者的变异论证。旧测试喂入 10 条路径（8 条噪声 + 2 条生产）， 改动把该测试重塑为与其有效兄弟（
变异验证临时变异
还原源码后，该文件全部 41 个测试通过。 冲突说明无—— 验证
Base-conflict check · 基分支冲突检查: no conflict with main. · 与 main 无冲突。 Re-review when you have a moment. After round 100 this bot stops and leaves the PR for a human. · 有空请复审；第 100 轮后本 bot 停止并将 PR 交给人工。 🧠 Handled by Qwen Code · model/模型 |
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Test Plan (not a blocker): 29 tests pass — this review observed 16869 passed.
中文说明
Test Plan（非阻断）：29 tests pass — this review observed 16869 passed。
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| // product flag with a ≥ boundary, megamorphic stated as unconditional) and a | ||
| // review measured them against a live JVM. Pin the corrected forms. | ||
| const out = pathRulesFor(['src/Main.java']); | ||
| expect(out).toContain('2500 on JDK 11+'); |
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[Critical] The checklist cites InlineSmallCode as "2500 on JDK 11+", but 2500 applies only from JDK 17 — JDK 11–16 x86 default to 2000. Verified against OpenJDK primary sources: JDK 17 compilerDefinitions.cpp sets 2500 on X86/AARCH64/RISCV64 (under tiered compilation), while JDK 11 tieredThresholdPolicy.cpp sets 2000 on X86 (also the author's live-JVM measurement; a local JDK 21 reads 2500, consistent). The "2000 on JDK 8" half is correct (jdk8u advancedThresholdPolicy.cpp sets 2000 on X86 under default tiered compilation). — Failure scenario: an agent reviewing a JDK 11–16 project quotes "InlineSmallCode 2500" as the native-size threshold; the real default is 2000, so a 2200-byte compiled method it calls safe is actually over the real cap and would be declined for inlining — the exact "guessing a number" failure this checklist exists to prevent. The autofix bot stated in round 2 it had changed this to "2500 on JDK 17+, 2000 on JDK 8–11", but the code at this commit still reads "2500 on JDK 11+", and this assertion pins the uncorrected string, so a later correction would fail the suite.
Fix (spans two locations — the checklist text and this pinning assertion):
// path-rules.ts:112 — change "2500 on JDK 11+, 2000 on JDK 8" to:
// 2500 on JDK 17+, 2000 on JDK 8–16
// path-rules.test.ts:157 — update the assertion to match:
expect(out).toContain('2500 on JDK 17+');
中文说明
清单把 InlineSmallCode 写成 "2500 on JDK 11+"，但 2500 只在 JDK 17 起生效——JDK 11–16 x86 的默认值是 2000。已对照 OpenJDK 一手源码核实：JDK 17 的 compilerDefinitions.cpp 在 X86/AARCH64/RISCV64（分层编译下）设为 2500，而 JDK 11 的 tieredThresholdPolicy.cpp 在 X86 上设为 2000（也与作者真机测量一致；本机 JDK 21 读出 2500，相符）。"2000 on JDK 8" 那一半是对的（jdk8u advancedThresholdPolicy.cpp 在默认分层编译下于 X86 设为 2000）。— 失败场景：agent 审查 JDK 11–16 项目时会把 "InlineSmallCode 2500" 当作原生尺寸阈值引用；真实默认是 2000，于是它认为"安全"的 2200 字节编译方法其实已超真实上限、会被拒绝内联——正是本清单旨在杜绝的"拍脑袋报数字"。autofix bot 第 2 轮声称已改成 "2500 on JDK 17+, 2000 on JDK 8–11"，但当前提交的代码仍是 "2500 on JDK 11+"，且此断言把未修正的字符串钉死，后续修正反而会让测试失败。
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| 'generated build output', | ||
| Array.from( | ||
| { length: 11 }, | ||
| (_, i) => `target/generated-sources/com/x/S${i}.java`, | ||
| ), |
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[Suggestion] The isOutOfScope generated-sources regex (?:^|\/)(?:target|build)\/(?:generated-sources|generated)\//i (path-rules.ts) covers four path shapes, but this it.each block exercises only target/generated-sources/ — the build/ prefix and the bare generated/ alternative have zero coverage. — Concrete cost: probe-verified, two one-line mutations to path-rules.ts survive the full 41-test suite — deleting |build from (?:target|build) reclassifies Gradle's build/generated/ output as production, and deleting |generated from (?:generated-sources|generated) reclassifies target/generated/ and build/generated/ as production; in both cases the generated paths fill the ten named heading slots and truncate the production path away (the exact regression the test comment claims to guard against), yet every test stays green. A future edit breaking Gradle generated-path scoping would ship uncaught. (Residual of R4-1 — the test now discriminates the test-root, info-only, and target/generated-sources/ branches, but not these two.)
Fix — add a fourth it.each row (verified to kill both mutants):
[
'Gradle generated output',
Array.from(
{ length: 11 },
(_, i) => `build/generated/com/x/S${i}.java`,
),
],
中文说明
isOutOfScope 的 generated-sources 正则 (?:^|\/)(?:target|build)\/(?:generated-sources|generated)\//i（path-rules.ts）覆盖四种路径形态，但这个 it.each 只测了 target/generated-sources/——build/ 前缀和裸 generated/ 分支零覆盖。— 具体代价：经探针验证，对 path-rules.ts 做两处单行突变后整套 41 个测试仍全绿——从 (?:target|build) 删掉 |build 会把 Gradle 的 build/generated/ 产物误判为生产代码，从 (?:generated-sources|generated) 删掉 |generated 会把 target/generated/ 和 build/generated/ 误判为生产代码；两种情况下 generated 路径都会占满十个命名槽、把生产路径挤掉（正是测试注释声称要防的回归），却没有一个测试能发现。未来任何破坏 Gradle generated 路径作用域的改动都会悄悄漏过。（R4-1 的残留——该测试现在能区分 test-root、info-only 和 target/generated-sources/ 分支，但漏了上述两个。）
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🤖 Addressed the latest review feedback (round 5/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 5/100 轮）。改动内容与我反驳保留之处如下： Round summaryAddressed both findings from the round-5 review on the Java/JVM path rule. No base-conflict resolution was needed ( Feedback points1.
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No issues found. LGTM! ✅
Test Plan (not a blocker): 29 tests pass — this review observed 16867 passed.
中文说明
未发现问题。LGTM！✅
Test Plan（非阻断）：29 tests pass — this review observed 16867 passed。
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Re-reviewed the updated code and comments at 19824ffc.
No blocking findings remain. I verified the prior Criticals against the exact current commit: the C2 table now describes size caps rather than inlining outcomes, static measurement is limited to a size-gate crossing, the JDK 8–16 / 17+ InlineSmallCode boundary is corrected, and the test/generated/info-only path regressions are covered by cap-sensitive tests. Both prompt consumers still scope the rule to the files each reviewing agent owns.
Verification: the focused suite passes 42/42; Prettier, ESLint, and git diff --check are clean; the current Ubuntu test, Desktop Shell, Web Shell E2E, and review checks are green. I left one explicitly non-blocking late-round follow-up inline for Maven generated test sources; per the repository rule for PRs already beyond roughly five review rounds, it does not request another blocking fix cycle.
中文说明
已基于最新提交 19824ffc 重新审查代码和评论。
没有剩余阻塞项。上一轮的 C2 阈值语义、静态/动态证据边界、InlineSmallCode 版本边界，以及测试/生成/info-only 路径覆盖都已在当前提交中修复；两个 prompt 消费点的文件作用域也保持正确。
本地定向测试 42/42 通过，Prettier、ESLint、git diff --check 均通过，当前 Ubuntu 测试、Desktop Shell、Web Shell E2E 和 review checks 均为绿色。另留了一条 Maven generated test sources 的非阻塞 follow-up；按仓库超过约五轮后只因 Critical 继续扩 PR 的规则，不要求因此再开启一轮阻塞修复。
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🤖 Addressed the latest review feedback (round 6/100). What changed, and what I pushed back on: · 已处理最新评审反馈（第 6/100 轮）。改动内容与我反驳保留之处如下： Round 8 — address review on PR #8379Feedback triageOne inline finding this round, no failed checks, no conflict (
The reviewer suggested a follow-up because the PR is past five rounds, while explicitly not blocking approval. The finding is nevertheless a real correctness gap in this PR's own heading-prioritization logic (the probe: 11 Changes
No checklist prose change was needed — it already scopes out "generated sources" generically. Commit: Verification
中文说明第 8 轮 — 处理 PR #8379 的评审意见意见分类本轮只有一条行内意见，无失败检查项，无冲突（
评审者因 PR 已超过五轮而建议作为 follow-up 处理，并明确表示不阻塞 approve。但该意见确实是本 PR 标题排序逻辑中的一个真实正确性缺口（复现方式：11 个 变更内容
检查清单正文无需改动 — 它本来就以"generated sources"泛指生成源码。 提交： 验证
Base-conflict check · 基分支冲突检查: no conflict with main. · 与 main 无冲突。 Re-review when you have a moment. After round 100 this bot stops and leaves the PR for a human. · 有空请复审；第 100 轮后本 bot 停止并将 PR 交给人工。 🧠 Handled by Qwen Code · model/模型 |
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Released in v0.21.4. |
5 participants
What this PR does
Adds a second built-in path rule to
/review(alongside the GitHub Actions one): a Java/JVM performance checklist that attaches to*.javapaths and reaches every code-reviewing agent whose territory actually contains one — dimension agents whole-diff, chunk agents scoped to their own files, and nothing at all on a non-Java diff. The checklist carries three tiers: correctness traps dressed as performance/concurrency code at Critical (sharedSimpleDateFormat, two-callConcurrentHashMapcompound actions, double-checked locking withoutvolatile); JVM-cost defects provable from source at Suggestion (per-call regex compilation,+=on a String in a loop, hot-path boxing, capturing lambdas hoisted into loops, log messages built whether or not they are logged, unpresized collections, legacy synchronized types, exceptions as control flow, per-call reflection); and the JIT inlining thresholds (MaxTrivialSize6 /MaxInlineSize35 /FreqInlineSize325 /HugeMethodLimit8000, plusInlineSmallCodeand the megamorphic call-site rule) with a two-tier verification discipline — measure bytecode withjavapagainst base and head, or run-XX:+PrintInlining/ JMH / JITWatch when the code is runnable, never state an inlining claim estimated from source, and, when a grown hot method is the finding, propose the fix as a hot/cold split (cold paths into a private helper) rather than a revert or@ForceInline.Why it's needed
The review's dimensions are domain-blind by design, and a Java diff's most expensive regressions are decided by the JVM, not by anything visible in the source: HotSpot chooses what to inline by the callee's bytecode size, and a one-line change that grows a small hot method past 325 bytes silently removes it from inlining. No dimension agent knows to ask that question, and a reviewer who estimates bytecode by eyeballing source gets it wrong often enough to teach authors to ignore the finding — so the rule both names the invisible defect class and forces measurement over guessing, which is the same contract Agent 4 already applies to benchmark claims.
Reviewer Test Plan
How to verify
Unit:
cd packages/cli && npx vitest run src/commands/review/lib/path-rules.test.ts— 29 tests pass, covering trigger/non-trigger paths (.ktand.java.mddo not match), stacking with the workflow rule, and the self-restraint clauses (diff-scoped, hot-path gate, severity discipline, measure-don't-estimate, and the hot/cold-split fix shape). Injection: build any plan whose files include a.javapath and runqwen review agent-prompt --plan <plan> --role 4; the emitted brief file contains the Java checklist, and a TypeScript-only plan emits nothing. End-to-end, this was dogfooded against alibaba/fastjson2#3992 (a BigDecimal parsing optimization): all nine code-reviewing agents received the checklist, and the performance agent applied the threshold reasoning correctly — it determined thatreadBigDecimalwas already far aboveFreqInlineSizebefore the diff and the change shrinks it, so no threshold crossing was possible, no new hot callers were added, and nojavapmeasurement was owed, stating exactly that justification instead of fabricating a JIT finding or measuring blindly. The review produced zero Java-rule false positives and a correct Comment verdict. The measurement procedure itself was verified end to end with a synthetic base/head pair: one small method grown from 44 to 492 bytecode bytes, thejavap -c -pmeasurement (last instruction offset + its width) detected the crossing ofFreqInlineSize, the measured sizes matched the JVM's own numbers byte for byte, and-XX:+PrintInliningon a hot loop showedinline (hot)for the small method andcallee is too large/hot method too bigfor the grown one. The checklist's marginal value over the bare model was measured with a blind A/B experiment on qwen3.8-max-preview: four crafted Java diffs were each reviewed by an Agent-4 equivalent with and without the rule. Without it, the agent never considered inlining on any diff and filed a high-confidence finding that a constant long division costs 20–90 cycles per iteration — bytecode-true, but C2 strength-reduces constant division, so the cost does not survive the JIT. With it, the agent measured every diff withjavap, reported an 80→338-byteFreqInlineSizecrossing at low confidence with the tier-2 check named, dismissed the division with the correct mechanism, and proposed the fix as a hot/cold split naming the exact bytecode range to extract. The same experiment cut three candidate additions (dense-key cache container choice, per-element-to-bulk loops, regex-for-fixed-formats): the control runs reached the same findings without them, so they would have been noise, not coverage.Evidence (Before & After)
N/A — agent prompt content, no user-visible surface.
Tested on
Environment (optional)
Dogfood:
review run 3992 --effort mediumagainst a local alibaba/fastjson2 clone with the working-tree build; full transcript and composed verdict under~/git/fastjson2/.qwen/reviews/.Risk & Scope
javaptier has now been executed by an agent (the A/B treatment runs measured every diff and produced the split fix), but in an isolated single-agent harness rather than a full multi-agent review. The A/B result is n=1 per condition per case on one model — directional for the cut items, robust for the inlining blindness (consistent across all four control runs). Kotlin/Scala and other JVM languages are deliberately not matched.Linked Issues
None.
中文说明
本 PR 做了什么
给
/review增加第二条内置 path rule（继 GitHub Actions 之后）：一个 Java/JVM 性能清单，挂到*.java路径上，注入到每个领土内实际包含 Java 文件的代码审查 agent——dimension agent 全 diff 范围、chunk agent 限自己领土，非 Java diff 完全零成本。清单分三层：伪装成性能/并发代码的正确性陷阱（Critical：共享SimpleDateFormat、两步调用拼出的ConcurrentHashMap复合操作、缺volatile的双重检查锁）；源码可证的 JVM 成本缺陷（Suggestion：每次调用重编译正则、循环内字符串+=、热路径装箱、被移进循环的捕获 lambda、无论是否输出都构造的日志消息、不预设容量的集合、遗留同步类型、异常当控制流、每次调用都做反射）；以及 JIT 内联阈值（MaxTrivialSize6 /MaxInlineSize35 /FreqInlineSize325 /HugeMethodLimit8000，外加InlineSmallCode与 megamorphic call site 规则）配两档验证纪律——用javap对 base/head 实测字节码，或在代码可运行时用-XX:+PrintInlining/ JMH / JITWatch，绝不从源码估算内联结论；当 finding 确是膨胀的热方法时，修复建议是 hot/cold split（冷路径移入私有 helper），而非回退或@ForceInline。为什么需要
review 的维度按设计是领域盲的，而 Java diff 最昂贵的回归由 JVM 决定、源码里完全看不见：HotSpot 按 callee 字节码大小决定内联，一处把小热方法改过 325 字节的一行改动会静默地让它失去内联。没有任何 dimension agent 知道要问这个问题；而靠肉眼估字节码的 reviewer 错得足够频繁，会教会作者无视这类 finding——所以这条规则既命名了这个看不见的缺陷类，又强制"测量而非猜测"，与 Agent 4 对 benchmark 数字的既有契约一致。
Reviewer 验证计划
单测：
cd packages/cli && npx vitest run src/commands/review/lib/path-rules.test.ts，29 个测试全过，覆盖触发/不触发路径（.kt、.java.md不匹配）、与 workflow 规则叠加、以及自我约束条款（diff 范围、热路径门槛、severity 纪律、禁止估算、hot/cold split 修复形态）。注入：构造任一含.java文件的 plan，跑qwen review agent-prompt --plan <plan> --role 4，产出的 brief 文件包含 Java 清单；纯 TypeScript plan 无输出。端到端：已对 alibaba/fastjson2#3992（BigDecimal 解析优化）做过 dogfood——9 个代码审查 agent 全部收到清单，性能 agent 正确应用了阈值推理：它判定readBigDecimal在 diff 前已远超FreqInlineSize，而改动是收缩，不可能跨阈，也没有新增热调用者，因此不欠javap测量，并原样陈述了这段理由，而不是编造 JIT finding 或盲目测量。该次 review 零 Java 规则误报，verdict 正确（Comment）。测量流程本身也用合成的 base/head 对做了端到端验证：一个小方法从 44 膨胀到 492 字节码字节，javap -c -p测量（最后一条指令 offset + 宽度）检出了对FreqInlineSize的跨越，测量值与 JVM 自报的尺寸逐字节一致，且热循环下-XX:+PrintInlining对小方法显示inline (hot)、对膨胀后的方法显示callee is too large/hot method too big。清单相对裸模型的边际价值用盲测 A/B 实验量化过（qwen3.8-max-preview）：4 个构造的 Java diff 分别由带/不带规则的 Agent-4 等价体审查。不带规则时，agent 在所有 diff 上都没考虑内联，还高置信度报了一个"常量 long 除法每次 20–90 cycles"的 finding——字节码层面为真，但 C2 会把常量除法强度削减，该成本过不了 JIT。带规则时，agent 对每个 diff 都用javap实测，以低置信度报出 80→338 字节的FreqInlineSize跨越并点名 tier-2 验证，用正确机制排除了那个除法，并把修复建议写成 hot/cold split、精确到要抽取的字节码区间。同一实验砍掉了三个候选增项（密集键缓存容器选型、逐元素转批量循环、正则用于固定格式）：control 组在没有它们的情况下得到了相同 finding，所以它们只会是噪音而非覆盖。风险与范围