Web Replay: add infrastructure for auto-memoizing nondeterministic DOM APIs

• Component: DOM
• Status: RESOLVED FIXED

[BJ Burg]

This intercession mechanism allows a developer to put [Nondeterministic] on an attribute or method in WebIDL. The code generator will automatically capture or replay the value using AutoMemoized<T>, a subclass of NondeterministicInput for T.

(Maybe it should be called MemoizedValue<T>?)

[BJ Burg]

Created attachment 225844 [details]
WIP patch

[BJ Burg]

Created attachment 226076 [details]
the complete patch

[WebKit Commit Bot]

Attachment 226076 [details] did not pass style-queue:


ERROR: Source/WebCore/replay/MemoizedDOMResult.h:117:  This { should be at the end of the previous line  [whitespace/braces] [4]
ERROR: Source/WebCore/replay/ReplayInputTypes.cpp:42:  Wrong number of spaces before statement. (expected: 4)  [whitespace/indent] [4]
Total errors found: 2 in 13 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[BJ Burg]

Created attachment 226077 [details]
bad attachment

I also attached the IDL changes I used to test the build and the various cases the code generator has to support for WEB_REPLAY and vanilla builds. The IDL changes won't be included in this patch, since they need separate testing.

[BJ Burg]

Created attachment 226078 [details]
IDL changes

[BJ Burg]

Created attachment 226079 [details]
sample generated code

[Timothy Hatcher]

Comment on attachment 226076 [details]
the complete patch

View in context: https://bugs.webkit.org/attachment.cgi?id=226076&action=review

> Source/WebCore/bindings/scripts/CodeGeneratorJS.pm:2208
> +                push(@implContent, "     }\n");

I'd add another \n here to give breathing room between the blocks.

> Source/WebCore/replay/MemoizedDOMResult.cpp:76
> +    encodedValue.put<String>("attribute", input.attribute());

These strings passed to put and get should use ASCIILiteral().

[Joseph Pecoraro]

Comment on attachment 226076 [details]
the complete patch

View in context: https://bugs.webkit.org/attachment.cgi?id=226076&action=review

> Source/WebCore/bindings/scripts/CodeGeneratorJS.pm:3548
> +            push(@implContent, $indent . "if (!cursor.isReplaying())\n");
> +            push(@implContent, $indent . "    $functionString;\n");

Shouldn't this also setDOMException if raises exception inside this if block?

[BJ Burg]

Committed r165521: <http://trac.webkit.org/changeset/165521>