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perf_hooks: make nodeTiming a first-class object #35977

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perf_hooks: make nodeTiming a first-class object #35977

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perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 5, 2020
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perf-hooks: Make nodeTiming a first-class object
mmomtchev Nov 5, 2020
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perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
166f6b3
perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
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perf_hooks: make nodeTiming a first-class object
mmomtchev Nov 6, 2020
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perf_hooks: make nodeTiming a first-class object 
Render all properties configurable
(@addaleax review)

#35977
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@mmomtchev
mmomtchev committed Nov 6, 2020
commit 166f6b3b4c47933b13ac5fea8d49c1bcc5a3d922
26 changes: 15 additions & 11 deletions lib/perf_hooks.js
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Expand Up @@ -165,78 +165,82 @@ function getMilestoneTimestamp(milestoneIdx) {
return ns / 1e6 - timeOrigin;
}

const PerformanceNodeTimingProps = {
enumerable: true,
configurable: true
};
class PerformanceNodeTiming extends PerformanceEntry {
constructor() {
super();

ObjectDefineProperties(this, {
name: {
enumerable: true,
...PerformanceNodeTimingProps,
value: 'node'
},
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entryType: {
enumerable: true,
...PerformanceNodeTimingProps,
value: 'node'
},

startTime: {
enumerable: true,
...PerformanceNodeTimingProps,
value: 0
},

duration: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return now() - timeOrigin;
}
},

nodeStart: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_NODE_START);
}
},

v8Start: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_V8_START);
}
},

environment: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_ENVIRONMENT);
}
},

loopStart: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_START);
}
},

loopExit: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(NODE_PERFORMANCE_MILESTONE_LOOP_EXIT);
}
},

bootstrapComplete: {
enumerable: true,
...PerformanceNodeTimingProps,
get() {
return getMilestoneTimestamp(
NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE);
}
},

idleTime: {
enumerable: true,
...PerformanceNodeTimingProps,

@jasnell jasnell Nov 6, 2020

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Non-blocking: I would just include the properties directly here (rather than use the repeated `...PerformanceNodeTimingProps) even if they're going to be duplicated just to save an unnecessary performance cost.

@mmomtchev mmomtchev Nov 6, 2020

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Hmm, do you think V8 keeps a reference to the initializing object when using the spread operator?

@mmomtchev mmomtchev Nov 6, 2020

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Yeah, this is ECMA specified in fact

get() {
return loopIdleTime();
}
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