Bug 126790 – CStack: Fix 64-bit C Loop LLINT

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Mark Lam]

Patch coming soon.

[Mark Lam]

Created attachment 220913 [details]
the patch.

[Geoffrey Garen]

Comment on attachment 220913 [details]
the patch.

View in context: https://bugs.webkit.org/attachment.cgi?id=220913&action=review

r=me

> Source/JavaScriptCore/llint/LLIntOpcode.h:48
> +    macro(llint_synthesized_label_1, 1) \
> +    macro(llint_synthesized_label_2, 1) \
> +    macro(llint_synthesized_label_3, 1) \
> +    macro(llint_synthesized_label_4, 1) \
> +    macro(llint_synthesized_label_5, 1) \
> +    macro(llint_synthesized_label_6, 1) \
> +    macro(llint_synthesized_label_7, 1) \

Let's call these "llint_cloop_did_return_from_js_N".

> Source/JavaScriptCore/llint/LowLevelInterpreter.cpp:93
> +#if 0

Let's give this a name, like ENABLE_OPCODE_TRACING.

> Source/JavaScriptCore/offlineasm/asm.rb:48
> +        @numSynthesizedGlobalLabels = 0

Let's call this "didReturnFromJSLabelCounter", and move into cloop.rb's Instruction class, using @@ syntax for a per-class variable.

> Source/JavaScriptCore/offlineasm/asm.rb:228
> +    def numSynthesizedGlobalLabels()
> +        @numSynthesizedGlobalLabels
> +    end
> +    def incNumSynthesizedGlobalLabels()
> +        @numSynthesizedGlobalLabels += 1
> +    end

See above renames.

[Mark Lam]

Thanks for the review.  The feedback has been applied.  Landed in r161927 on the jsCStack branch: <http://trac.webkit.org/r161927>.

[Mark Lam]

*** Bug 126392 has been marked as a duplicate of this bug. ***

[Mark Lam]

*** Bug 126007 has been marked as a duplicate of this bug. ***

[Mark Lam]

*** Bug 126191 has been marked as a duplicate of this bug. ***

[Mark Lam]

(In reply to comment #3)
> Thanks for the review.  The feedback has been applied.  Landed in r161927 on the jsCStack branch: <http://trac.webkit.org/r161927>.

The merge had a conflict that went uncaught by svn. This resulted in a redundant push of lr and a redundant pop of cfr, and this breaks the C loop runs (as well as ARMv7 and other similar architectures).  This is now fixed in r161942: <http://trac.webkit.org/r161942>.