Bug 223532 – Uncaught Exception: RangeError: Array size is not a small enough positive integer.

• Component: Web Inspector
• Status: RESOLVED FIXED

[Blaze Burg]

Uncaught Exception in Web Inspector.

Steps to Reproduce:
1. Timelines Tab > Start Recording
2. Export / Save Recording
3. Load saved recording
4. Select CPU instrument

=> uncaught exception

Uncaught Exceptions:
-----------------------
 - RangeError: Array size is not a small enough positive integer. (at CPUTimelineView.js:1274:32)
    _computeStatisticsData @ CPUTimelineView.js:1274:32
    layout @ CPUTimelineView.js:459:59
    _layoutSubtree @ View.js:293:20
    updateLayout @ View.js:159:28
    showTimelineViewForTimeline @ TimelineRecordingContentView.js:153:37
    _timelineSelected @ TimelineRecordingContentView.js:799:45
    dispatch @ Object.js:129:35
    dispatchEventToListeners @ Object.js:137:17
    _timelinesTreeSelectionDidChange @ TimelineOverview.js:896:38
    dispatch @ Object.js:129:35
    dispatchEventToListeners @ Object.js:137:17
    _dispatchSelectionDidChangeEvent @ TreeOutline.js:1083:38
    selectionControllerSelectionDidChange @ TreeOutline.js:755:46
    _updateSelectedItems @ SelectionController.js:458:65
    selectItem @ SelectionController.js:155:34
    handleItemMouseDown @ SelectionController.js:322:28
    _handleMouseDown @ TreeOutline.js:1067:54
    _handleMouseDown @ [native code]
-----------------------

Notes:
Inspected URL:        favorites://
Loading completed:    true
Frontend User Agent:  Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko)

[Blaze Burg]

Relevant code: 

        let millisecondStartTime = Math.round(startTime * 1000);
        let millisecondEndTime = Math.round(endTime * 1000);
        let millisecondDuration = millisecondEndTime - millisecondStartTime;

        let samples = new Array(millisecondDuration);

For some reason `endTime` is 0 here, so the overall duration is negative and the Array constructor throws.

[Radar WebKit Bug Importer]

<rdar://problem/75635080>

[Blaze Burg]

Created attachment 423776 [details]
Patch v1.0

[Devin Rousso]

Comment on attachment 423776 [details]
Patch v1.0

rs=me

[Blaze Burg]

Committed r274737 (235555@main): <https://commits.webkit.org/235555@main>