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createHistogram() checked lowest, highest and figures by hand. A number that was not an integer passed the checks, and the native side truncated it. A BigInt went through Number(), so the int64 maximum rounded up to 2 ** 63 and hdr_init() failed on x64. Number options now go through validateInteger() in the order that Node v26.3.0 uses: lowest, highest, figures. A BigInt option is checked as a BigInt, the way validateHistogramOptions() on Node main does it, and reaches the native function without a conversion. The Histogram constructor took the same three values with no check. It now throws ERR_ILLEGAL_CONSTRUCTOR, as in Node.
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Updated 6:49 AM PT - Sep 17th, 2026
✅ @robobun, your commit ea64935bdb54e2e5b8f92fefa27cfbe4f46ea76a passed in 🧪 To try this PR locally: bunx bun-pr 43072That installs a local version of the PR into your bun-43072 --bun |
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Status Reproduced on bun 1.4.3-canary.1+c6b7fcb5b (Linux x64), next to node v26.3.0: const { createHistogram } = require("node:perf_hooks");
createHistogram({ lowest: 1.5 }); // bun: ok node: RangeError ERR_OUT_OF_RANGE (It must be an integer. Received 1.5)
createHistogram({ highest: 2 ** 53 }); // bun: ok node: RangeError ERR_OUT_OF_RANGE
createHistogram({ figures: NaN }); // bun: TypeError "Failed to initialize histogram" node: RangeError ERR_OUT_OF_RANGE
createHistogram({ highest: 2n ** 63n - 1n }); // bun on x64: TypeError "Failed to initialize histogram" node: ok
new (createHistogram().constructor)(1.5, NaN); // bun: ok node: TypeError ERR_ILLEGAL_CONSTRUCTOR
PR: #43072 |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked two things the BigInt/constructor changes depend on: jsFunction_createHistogram in src/jsc/bindings/JSNodePerformanceHooksHistogramPrototype.cpp:393-406 converts BigInt args with JSBigInt::toBigInt64, which is exact for values already bounded to 1n..2n**63n-1n by the new JS check; and monitorEventLoopDelay (JSNodePerformanceHooksHistogramPrototype.cpp:452) builds its histogram via JSNodePerformanceHooksHistogram::create directly, so removing the constructor's [[Construct]] path does not affect it.
Extended reasoning...
Findings were already reported inline, so this body only records what else was examined. The "What changed" summary flagged two open questions: whether the C++ jsFunction_createHistogram handles BigInt arguments correctly now that the JS layer passes them through unconverted, and whether deleting new Histogram(...) construction breaks another caller. Reading JSNodePerformanceHooksHistogramPrototype.cpp shows the BigInt branch uses JSBigInt::toBigInt64, which is lossless for any value that passed the new 1n..kMaxInt64 range check, and the only other histogram producer (jsFunction_monitorEventLoopDelay) calls JSNodePerformanceHooksHistogram::create directly rather than the JS-visible constructor, so the ERR_ILLEGAL_CONSTRUCTOR change does not reach it. No structured-clone registration exists for this class, so that path is not affected either.
WalkthroughHistogram creation now validates number and BigInt bounds without coercing BigInts to numbers. Direct ChangesHistogram creation and constructor behavior
Priority: ⬇️ Low Merge Risk: 🔵 Low · up to This change tightens createHistogram() option validation to match Node.js behavior and makes direct construction of Histogram objects always fail with a clear error, while the normal factory function continues to work correctly for valid inputs. The remaining open item is a minor test-authoring style suggestion (using describe.each for parameterized cases) that affects test readability/reporting granularity, not runtime behavior, so the change is safe to merge with that follow-up noted. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Actionable comments posted: 1
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Inline comments:
In `@test/js/bun/perf_hooks/histogram.test.ts`:
- Around line 372-374: Convert the parameterized histogram test loops around the
option names and invalid values, including the additional referenced cases, to
describe.each() suites so every input combination produces a separate test
result. Preserve the existing assertions and test behavior while replacing the
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src/js/node/perf_hooks.tssrc/jsc/bindings/JSNodePerformanceHooksHistogramConstructor.cpptest/js/bun/perf_hooks/histogram.test.ts
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… the hdr_init error
The shared validateInteger() raised max to min when min was above max.
createHistogram() is the only caller that can pass such a range
(2 * lowest above MAX_SAFE_INTEGER), and it then accepted
{ lowest: 2 ** 52, highest: 2 ** 53 }. Node never changes max, so the
clamp is removed.
When hdr_init() rejects options that passed validation, throw
ERR_INVALID_ARG_VALUE "Invalid histogram options" as Node v26.9.0 does,
in place of a TypeError with no code.
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Review round 1, answered in the threads. Summary:
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I re-reviewed the latest push (c80bb50 and the two comment-only commits after it) and found no bugs; the follow-up commit addresses what I raised earlier on the validator clamp and the uncoded hdr_init failure. A human look is still worthwhile because this drops a clamp from the shared validateInteger used by ~100 callers, deletes the new Histogram(lowest, highest, figures) construct path, and follows unreleased Node main rather than v26.3.0 for the BigInt branch.
What was reviewed:
NodeValidator.cppclamp removal: checked every C++ call site with a computed bound (Buffer.fillendusesbyteLengthwith min 0, HKDF/keygen/VM/process use constants) and the JS sites with computedmin(argon28 * parallelism,2 * lowest) — none can passmin > maxbesidescreateHistogram, which now wants the real bounds.- BigInt pass-through:
jsFunction_createHistogramusesJSBigInt::toBigInt64, exact for values that survived the new[1n, INT64_MAX]check; number values reachtruncateDoubleToInt64only aftervalidateIntegerbounded them to[1, MAX_SAFE_INTEGER]. - Deleted construct path: no other
src/jsorsrc/jsccode constructs the class directly;monitorEventLoopDelayandcreateHistogramboth go through the host functions. - Tests: the
{ skip: !process.versions.bun }guards each carry a comment naming the Node behavior they avoid, so nothing is skipped under Bun. I did not have a debug build available in this environment, so the test file was reviewed statically rather than run.
Extended reasoning...
Overview
The PR replaces hand-rolled option validation in createHistogram (src/js/node/perf_hooks.ts) with validateInteger for number options in Node's order (lowest, highest, figures) and adds a validateHistogramBound helper for BigInt bounds checked against [1n, 2n**63n - 1n] without narrowing through Number(). It removes the max_num = std::max(min_num, max_num) clamp from both validateInteger overloads in src/jsc/bindings/NodeValidator.cpp, changes the hdr_init failure in JSNodePerformanceHooksHistogram.cpp from a bare TypeError to ERR_INVALID_ARG_VALUE "Invalid histogram options", and deletes the createHistogramInternal construct path in JSNodePerformanceHooksHistogramConstructor.cpp so new Histogram(...) throws ERR_ILLEGAL_CONSTRUCTOR with length 0. About 200 lines of exact-message assertions were added to the existing test/js/bun/perf_hooks/histogram.test.ts.
Security risks
None specific to this change. The validation is strictly tighter than before: numbers reach truncateDoubleToInt64 only after being bounded to [1, MAX_SAFE_INTEGER], and BigInts reach JSBigInt::toBigInt64 only inside int64 range, which removes the previous x64/arm64 divergence on 2**63 and Infinity. The remaining C++ path in jsFunction_createHistogram still uses non-throwing asNumber/toBigInt64 on values, but those are only reachable from the builtin module after validation, and hdr_init failures now surface as a coded error rather than an abort. The mixed BigInt/number comparison (highest < minimumHighest) is a JS relational comparison, which is exact across the types.
Level of scrutiny
Moderate. The runtime code is small and I traced each path statically, but three aspects are judgment calls a maintainer should confirm rather than a bot: (1) the shared validateInteger clamp removal is a behavior change for any caller that could pass min > max — I audited the C++ call sites with computed bounds (JSBuffer.cpp fill end against byteLength with min 0; HKDF, keygen, VM timeout, process ids with constants) and the JS sites with computed min (crypto.ts argon2 8 * parallelism against MAX_POSITIVE_UINT_32, and 2 * lowest here) and found none other than createHistogram that can invert, matching the author's claim; (2) deleting the constructible path is an observable API removal, though nothing in src/js or src/jsc constructs the class directly and Node also throws; (3) the BigInt branch deliberately follows an unreleased Node main commit rather than v26.3.0, which is a compat-policy choice.
Other factors
The prior run's two code-level comments (the validator clamp and the uncoded hdr_init error) are addressed in commit c80bb50; the third (constructor name Histogram vs Node's RecordableHistogram) is explicitly listed in the PR as not changed with a stated reason involving util.inspect, which is a reasonable scope decision. The test file uses node:test and the three skip: !process.versions.bun guards each carry a comment explaining the Node v26.3.0 behavior they avoid, so under Bun every test runs. No debug build was present in this environment and building one was out of budget for this review, so I did not execute the tests; the assertions read as consistent with the code paths (including the 10n suffix in the mixed-type message, which the JS template produces for both number and BigInt minimumHighest). No CODEOWNERS entries cover the changed files.
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No code change for this round. For the maintainer, the three decisions that the re-review names, and where the PR body supports each:
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#46650 replaced the histogram bindings that this PR edits, and it validates the
Closing as superseded by #46650. |
Problem
perf_hooks.createHistogram()accepts a number option that is not an integer:{ lowest: 1.5 },{ figures: 2.5 }and{ highest: 2 ** 53 }return a histogram. Node v26.3.0 throwsERR_OUT_OF_RANGE.createHistogram({ highest: 2n ** 63n - 1n })throwsTypeError: Failed to initialize histogramon x64 (Bug: CPU and event-loop delay are missing on Linux Bun openclaw/openclaw#143800). Node accepts it.createHistograminsrc/js/node/perf_hooks.ts:332. Its checks do not test for an integer. It converts a BigInt withNumber(), which rounds the int64 maximum up to2 ** 63.Fix
validateInteger()in the order of Node v26.3.0:lowest,highest,figures. The class, code and message match. The shared validator raisedmaxtominwhenmin > max, which let{ lowest: 2 ** 52, highest: 2 ** 53 }pass. That clamp is removed, and no other caller can passmin > max.hdr_init()unconverted. Node v26.3.0 throws aTypeErroror aborts for most BigInt options, so this branch isvalidateHistogramOptionsfrom Node main. The code staysERR_OUT_OF_RANGE.new histogram.constructor(1.5, NaN, 2.5)had no check. It now throwsERR_ILLEGAL_CONSTRUCTOR, as in Node. Options thathdr_init()still rejects throwERR_INVALID_ARG_VALUE(Invalid histogram options), as in Node v26.9.0.test/js/bun/perf_hooks/histogram.test.ts. 9 new tests fail on bun 1.4.3-canary. The file passes undernode --testv26.3.0.Background
createHistogram()returns a histogram backed by HdrHistogram.lowestandhighestbound the tracked values, andfiguresis the number of accurate digits.hdr_init()takes all three as integers.validateInteger()ininternal/validatorsis the Bun port of the Node validator. It throwsERR_INVALID_ARG_TYPEunless the value is a number, andERR_OUT_OF_RANGEunless it is an integer in range.histogram.record()truncates in the same way. node:perf_hooks: make Histogram values and argument checks match node #43060 fixes it.Notes
Node references
lib/internal/histogram.jsL367-L384 at v26.3.0.process.versions.nodein Bun is 26.3.0, and v26.9.0 has the same checks.validateHistogramOptionson main (nodejs/node@c327212373, not in a release yet). Main also changes the text of the numberhighestrange. This PR keeps the v26.3.0 text for numbers.Number options (Node v26.3.0 and this PR print the same)
{ lowest: 1.5 },{ highest: 10.5 },{ figures: 2.5 }ERR_OUT_OF_RANGE:It must be an integer. Received 1.5{ figures: NaN },{ lowest: NaN }TypeError: Failed to initialize histogramERR_OUT_OF_RANGE:It must be an integer. Received NaN{ highest: Infinity }Failed to initialize histogram. arm64: okERR_OUT_OF_RANGE:It must be an integer. Received Infinity{ highest: 2 ** 53 }ERR_OUT_OF_RANGE:It must be >= 2 && <= 9007199254740991. Received 9_007_199_254_740_992{ lowest: 2 ** 53 }ERR_OUT_OF_RANGEforoptions.highestERR_OUT_OF_RANGEforoptions.lowest{ lowest: 2, highest: 3.5 }It must be >= 4 && <= 9007199254740991. Received 3.5It must be an integer. Received 3.5{ lowest: 0, figures: 9 }options.figuresoptions.lowest{ lowest: "x" }must be one of type number or bigintmust be of type numberBigInt options (Node nightly v27.0.0-nightly20260916 and this PR print the same, for all 20 BigInt cases of my probe)
{ lowest: 1_000n, highest: 2n ** 63n - 1n, figures: 3 }Failed to initialize histogram. arm64: ok{ lowest: 1n },{ highest: 2n ** 60n },{ lowest: 5n, highest: 10 }TypeError: Cannot mix BigInt and other types{ lowest: 5n, highest: 9n }RangeErrorERR_INVALID_ARG_VALUEERR_OUT_OF_RANGEERR_OUT_OF_RANGE:It must be >= 2 * options.lowest (10n). Received 9n{ lowest: 0n, highest: 100n }Assertion failed: (0) == (hdr_init(...))ERR_OUT_OF_RANGE,Received 0ERR_OUT_OF_RANGE:It must be >= 1n && <= 9223372036854775807n. Received 0n{ highest: 2n ** 63n },{ highest: 2n ** 64n }Failed to initialize histogram. arm64: ok, clamped to the int64 maximumERR_OUT_OF_RANGE:It must be >= 1n && <= 9223372036854775807n{ lowest: 2n ** 53n + 3n, highest: 2n * lowest, figures: 1 }Why x64 and arm64 differ today.
truncateDoubleToInt64iscvttsd2sion x64, which returnsINT64_MINfor2 ** 63. On arm64 it isvcvtd_s64_f64, which saturates. I ran the canary on both: arm64 accepts{ highest: 2n ** 64n }and{ highest: Infinity }and clamps them. With this PR every platform throws for these, like Node.When
hdr_init()rejects the options. Options can pass every check and still fail in HdrHistogram, for example{ lowest: 2 ** 51, highest: 2 ** 53 - 1, figures: 5 }. Bun threwTypeError: Failed to initialize histogramwith nocode. Node v26.3.0 to v26.8.2 abort. Node v26.9.0 throwsERR_INVALID_ARG_VALUEwith the messageInvalid histogram options(HistogramBase::Newinsrc/histogram.cc), and Bun now throws the same.The
validateInteger()clamp.src/jsc/bindings/NodeValidator.cpphadmax_num = std::max(min_num, max_num)in both overloads since the first C++ version (#13757). Withmin > maxit accepted exactlyvalue == minand printed<= min. I checked all 81 call sites insrc/jsand all 17 in C++. Every other caller passes constant bounds, or aminthat cannot be abovemax(shard.indexaftershard.total >= 1, argon28 * parallelism, thenode:testmock call index).createHistogramwith2 * lowestis the only one that can passmin > max. Ran the Node tests for the callers:test-buffer-{alloc,compare-offset,copy,fill,readint,writeint},test-console-group,test-crypto-{argon2,hkdf,keygen-bit-length},test-fs-cp-*-mode-*,test-http2-getpackedsettings,test-process-{euid-egid,exit-code-validation,initgroups,setgroups,uid-gid},test-runner-mocking,test-vm-timeout, andtest/js/node/buffer.test.js.Not changed here
-0prints asReceived 0(the sharedERR_OUT_OF_RANGEformatter). This is the only difference from Node v26.3.0 left in my number probe.jsFunction_createHistogramin C++ is not changed. Its BigInt branch (JSBigInt::toBigInt64) was unreachable before, because the JS side always passed a number. It is exact for a value that passed the new range check.histogram.constructor.namestaysHistogram(Node:RecordableHistogram).util.inspect()builds its prefix from that name. With the name changed it printsRecordableHistogram {}, and Node printsHistogram {...}from a custom inspect, so the change needs that inspect too. The same constructor also backsmonitorEventLoopDelay(), which isELDHistogramin Node.record(),percentile(),minandmax: node:perf_hooks: make Histogram values and argument checks match node #43060.add()argument wording: node errors: render a single class name in ERR_INVALID_ARG_TYPE as "an instance of" like node #38694.Other suites run:
test/js/node/perf_hooks/perf_hooks.test.ts,test-perf-hooks-timerify-histogram-sync.mjs,test-perf-hooks-timerify-histogram-async.mjs, themonitorEventLoopDelaycase oftest/cli/test/isolation.test.ts, andhistogram.test.tswithBUN_JSC_validateExceptionChecks=1.Self-reviewed. The review asked for a rework of the first draft, and this PR is that rework. Addressed: the BigInt checks lost exactness above
2 ** 53and changed the error code, the int64 maximum still failed, and the constructor skipped the validation. Not taken:record()in this PR, because #43060 already fixes it. Not taken: a separate tracking issue for the int64 maximum, because this PR fixes it and links the report.[human-review] gate passed · iteration 0 · 5 files touched
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