Web Inspector: We should have a way to capture heap snapshots programatically.

• Component: Web Inspector
• Status: RESOLVED FIXED

[Mark Lam]

This will come in handy for web devs who need to profile memory usage or detect leaks as a result of executing a certain section of script code.

We should also be able to provide a description string to label the snapshot being taken.

[Radar WebKit Bug Importer]

<rdar://problem/24726292>

[Joseph Pecoraro]

I'd suggest something like:

    console.heapSnapshot(name);

Which is similar to how we do programmatic JavaScript profiles:

    console.profile(name)
    console.profileEnd(name)

[Joseph Pecoraro]

Looks like Microsoft already has:
<https://msdn.microsoft.com/en-us/library/windows/apps/jj819176(v=vs.120).aspx#SnapshotDetails>

    console.takeHeapSnapshot

So we can use that to be consistent!

[Joseph Pecoraro]

Created attachment 274364 [details]
[PATCH] Proposed Fix

This adds console.takeHeapSnapshot. It will only work if:

1. The inspector is open
2. The inspector's Timeline tab has the Heap Allocations timeline (currently this is always)
NOTE: You do not need to be recording.

We may want to provide an alternative, like a Console Message that you can click on to show the snapshot Content View.

[Joseph Pecoraro]

Mozilla bug for this:
Implement console.takeHeapSnapshot
https://bugzilla.mozilla.org/show_bug.cgi?id=960662

Chrome bug for this:
No JavaScript call to trigger a heap snapshot
https://bugs.chromium.org/p/chromium/issues/detail?id=31516

[Joseph Pecoraro]

Created attachment 274366 [details]
[PATCH] Proposed Fix

[Joseph Pecoraro]

Created attachment 275109 [details]
[PATCH] For Landing

[WebKit Commit Bot]

Comment on attachment 275109 [details]
[PATCH] For Landing

Clearing flags on attachment: 275109

Committed r198786: <http://trac.webkit.org/changeset/198786>