Bug 169832 – [JSC] Remove unnecessary condition from needsDerivedConstructorInArrowFunctionLexicalEnvironment in BytecodeGenerator.cpp

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[GSkachkov]

Remove unnecessary condition from needsDerivedConstructorInArrowFunctionLexicalEnvironment in BytecodeGenerator.cpp

[GSkachkov]

Created attachment 304823 [details]
Patch

Patch

[Build Bot]

Comment on attachment 304823 [details]
Patch

Attachment 304823 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/3352057

New failing tests:
fast/mediastream/apply-constraints-audio.html

[Build Bot]

Created attachment 304828 [details]
Archive of layout-test-results from ews107 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews107  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[GSkachkov]

Created attachment 304865 [details]
Patch

Updated Patch

[Mark Lam]

Comment on attachment 304865 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=304865&action=review

> Source/JavaScriptCore/ChangeLog:10
> +        isConstructor.

I think you mean "isClassContext" here.

> Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp:1031
> -    if ((isConstructor() && constructorKind() == ConstructorKind::Extends) || m_codeBlock->isClassContext()) {
> -        if (isSuperUsedInInnerArrowFunction())
> -            return true;
> -    }
> -    return false;
> +    return m_codeBlock->isClassContext() && isSuperUsedInInnerArrowFunction();

I understand that m_codeBlock->isClassContext() means that "executable->superBinding() == SuperBinding::Needed", and that in turn is true because we set "expectedSuperBinding = m_defaultConstructorKind == ConstructorKind::Extends ? SuperBinding::Needed : SuperBinding::NotNeeded".  However, this relationship is a few steps removed.  Can you add an assert before this so that the relationship doesn't change without us noticing?
    ASSERT(m_codeBlock->isClassContext() || !(isConstructor() && constructorKind() == ConstructorKind::Extends));

[GSkachkov]

Committed r214138: <http://trac.webkit.org/changeset/214138>

All reviewed patches have been landed.  Closing bug.

[GSkachkov]

Fixed and landed