Bug 152468 – FTL B3 should do vararg calls

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Filip Pizlo]

Patch forthcoming.

[Filip Pizlo]

Created attachment 267723 [details]
it begins

[Filip Pizlo]

Created attachment 267727 [details]
a bit more

[Filip Pizlo]

Created attachment 267728 [details]
almost done

[Filip Pizlo]

Created attachment 267737 [details]
it compiles

[Filip Pizlo]

Created attachment 267754 [details]
it seems to work

[WebKit Commit Bot]

Attachment 267754 [details] did not pass style-queue:


ERROR: Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5139:  Place brace on its own line for function definitions.  [whitespace/braces] [4]
ERROR: Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5227:  Place brace on its own line for function definitions.  [whitespace/braces] [4]
ERROR: Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5233:  Place brace on its own line for function definitions.  [whitespace/braces] [4]
ERROR: Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5322:  Place brace on its own line for function definitions.  [whitespace/braces] [4]
Total errors found: 4 in 7 files


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

[Benjamin Poulain]

Comment on attachment 267754 [details]
it seems to work

View in context: https://bugs.webkit.org/attachment.cgi?id=267754&action=review

I am not familiar with the JS calling convention but nothing looks crazy here.

> Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5112
> +            // different register for the late for the post-clobbering version of the value. This gives
> +            // the compiler to spill these values without having to burn any callee-saves.

"to spill"->"a chance to spill"?

[Filip Pizlo]

(In reply to comment #7)
> Comment on attachment 267754 [details]
> it seems to work
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=267754&action=review
> 
> I am not familiar with the JS calling convention but nothing looks crazy
> here.
> 
> > Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5112
> > +            // different register for the late for the post-clobbering version of the value. This gives
> > +            // the compiler to spill these values without having to burn any callee-saves.
> 
> "to spill"->"a chance to spill"?

Yeah, that's what I meant!

[Filip Pizlo]

Landed in http://trac.webkit.org/changeset/194334

[Csaba Osztrogonác]

(In reply to comment #9)
> Landed in http://trac.webkit.org/changeset/194334

It broke the EFL build:
https://build.webkit.org/builders/EFL%20Linux%2064-bit%20Release%20WK2/builds/26013

../../Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp: In member function ‘void JSC::FTL::{anonymous}::LowerDFGToLLVM::compileCallOrConstructVarargs()’:
../../Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp:5084:14: error: variable ‘forwarding’ set but not used [-Werror=unused-but-set-variable]
         bool forwarding = false;

[Csaba Osztrogonác]

Fix landed in https://trac.webkit.org/changeset/194347

[Filip Pizlo]

(In reply to comment #11)
> Fix landed in https://trac.webkit.org/changeset/194347

Thanks!