Bug 46572 – Avoid constructing arguments object when accessing length and index properties

• Component: New Bugs
• Status: RESOLVED FIXED

[Oliver Hunt]

Avoid constructing arguments object when accessing length and index properties

[Oliver Hunt]

Created attachment 68837 [details]
Patch

[Oliver Hunt]

Committed r68338: <http://trac.webkit.org/changeset/68338>

[WebKit Review Bot]

http://trac.webkit.org/changeset/68338 might have broken Qt Linux Release

[David Kilzer (:ddkilzer)]

(In reply to comment #2)
> Committed r68338: <http://trac.webkit.org/changeset/68338>

This change caused a regression in the Interpreter:  Bug 46690.

[Edward Sabol]

Is this going to be backed out or is a fix in the works?

[yonkong]

I build r69847 code using the following macro
#define WTF_USE_JSVALUE32 1
#define ENABLE_JIT 1
#define ENABLE_JIT_OPTIMIZE_CALL 0
#define ENABLE_JIT_OPTIMIZE_NATIVE_CALL 0
#define ENABLE_JIT_OPTIMIZE_PROPERTY_ACCESS 0
#define ENABLE_JIT_OPTIMIZE_METHOD_CALLS 0

Then I used the program the executing the js code:
function foo(){
alert(arguments.length);//the result is 2.
}
foo(1,2,3,4);

when I open www.baidu.com and other urls, the program would be crash.
And the OS is windows xp. I had met the same problem in arm platform.

I had done the same thing using r67643 code, and found no problems. And I had tried to build r69847 code using the macro 
#define ENABLE_JIT 1
#define ENABLE_JIT_OPTIMIZE_CALL 0
#define ENABLE_JIT_OPTIMIZE_NATIVE_CALL 0
#define ENABLE_JIT_OPTIMIZE_PROPERTY_ACCESS 0
#define ENABLE_JIT_OPTIMIZE_METHOD_CALLS 0
and nothing problem was found.

By a way, the file JITPropertyAccess.cpp's function emit_op_put_by_id,
a sentence is like that:
JITStubCall stubCall(this, direct ? cti_op_put_by_id_direct_generic, cti_op_put_by_id_generic);
should't it be the next sentence?
JITStubCall stubCall(this, direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic);

please check, thanks.

[Oliver Hunt]

(In reply to comment #6)
> I build r69847 code using the following macro
> #define WTF_USE_JSVALUE32 1

JSVALUE32 is no longer a supported configuration on any platform