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performance: fix timerify bug #40625

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performance: fix timerify bug #40625

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36c886f
performance: fix timerify bug
iam-frankqiu Oct 27, 2021
304d5df
perf_hooks: add a test and drop isConstructor
iam-frankqiu Oct 27, 2021
47edde3
perf_hooks: alter the test and format timerify
iam-frankqiu Oct 28, 2021
591f94b
doc: add a comment to the fn
iam-frankqiu Oct 30, 2021
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4 changes: 3 additions & 1 deletion doc/api/perf_hooks.md
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Original file line number Diff line number Diff line change
Expand Up @@ -232,7 +232,9 @@ changes:
to time async functions.
-->

* `fn` {Function}
* `fn` {Function} Only accept function and class. If the fn is a function(
includes "old style" class) will be executed directly or will be executed
by the `new` operator.
* `options` {Object}
* `histogram` {RecordableHistogram} A histogram object created using
`perf_hooks.createHistogram()` that will record runtime durations in
Expand Down
13 changes: 5 additions & 8 deletions lib/internal/perf/timerify.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,10 +21,6 @@ const {
isHistogram
} = require('internal/histogram');

const {
isConstructor,
} = internalBinding('util');

const {
codes: {
ERR_INVALID_ARG_TYPE,
Expand Down Expand Up @@ -73,13 +69,14 @@ function timerify(fn, options = {}) {

if (fn[kTimerified]) return fn[kTimerified];

const constructor = isConstructor(fn);
// If the parameter is a function and it will be called directly
// or used as `new` operator.
const isCalledAsConstructor = (fn) => /^\s*class/.test(fn.toString());

function timerified(...args) {
const start = now();
const result = constructor ?
ReflectConstruct(fn, args, fn) :
ReflectApply(fn, this, args);
const result = isCalledAsConstructor(fn) ?
ReflectConstruct(fn, args, fn) : ReflectApply(fn, this, args);
Comment on lines +78 to +79
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Suggested change
const result = isCalledAsConstructor(fn) ?
ReflectConstruct(fn, args, fn) : ReflectApply(fn, this, args);
const result = new.target !== undefined ?
ReflectConstruct(fn, args, fn) :
ReflectApply(fn, this, args);

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You marked this conversation as resolved but didn't take my suggestion. Is it because you disagree with it, or because you forgot to push?

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@aduh95 wouldn't new.target not be undefined only if timerified() is called with new instead of fn()?

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Yes, but that's the point. We want the timerified function to behave the same as the original function in both cases.

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@RaisinTen RaisinTen Oct 31, 2021 •
edited
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Ah, we are returning timerified from timerify. Yea, this makes sense 👍

if (!constructor && typeof result?.finally === 'function') {
iam-frankqiu marked this conversation as resolved.
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return result.finally(
FunctionPrototypeBind(
Expand Down
7 changes: 0 additions & 7 deletions src/node_util.cc
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Expand Up @@ -289,11 +289,6 @@ static void GuessHandleType(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(OneByteString(env->isolate(), type));
}

static void IsConstructor(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsFunction());
args.GetReturnValue().Set(args[0].As<v8::Function>()->IsConstructor());
}

static void ToUSVString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK_GE(args.Length(), 2);
Expand Down Expand Up @@ -344,7 +339,6 @@ void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
registry->Register(WeakReference::IncRef);
registry->Register(WeakReference::DecRef);
registry->Register(GuessHandleType);
registry->Register(IsConstructor);
registry->Register(ToUSVString);
}

Expand Down Expand Up @@ -384,7 +378,6 @@ void Initialize(Local<Object> target,
env->SetMethodNoSideEffect(target, "getConstructorName", GetConstructorName);
env->SetMethodNoSideEffect(target, "getExternalValue", GetExternalValue);
env->SetMethod(target, "sleep", Sleep);
env->SetMethodNoSideEffect(target, "isConstructor", IsConstructor);

env->SetMethod(target, "arrayBufferViewHasBuffer", ArrayBufferViewHasBuffer);
Local<Object> constants = Object::New(env->isolate());
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24 changes: 24 additions & 0 deletions test/parallel/test-performance-function.js
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Expand Up @@ -13,6 +13,30 @@ const {
setTimeout: sleep
} = require('timers/promises');

{
const perf = performance.timerify(function foo() {
let sum = 0;
for (let i = 0; i < 101; i++) {
sum += i;
}
return sum;
});
const result = perf();
assert.strictEqual(result, 5050);
}

{
class Foo {
constructor() {
/* eslint-disable no-constructor-return */
return Promise.resolve('foo');
}
}
const perf = performance.timerify(Foo);
const result = perf();
result.then(common.mustCall((val) => assert.strictEqual(val, 'foo')));
}

{
// Intentional non-op. Do not wrap in common.mustCall();
const n = performance.timerify(function noop() {});
Expand Down