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Bug 601689 - Optimize GetArrayElement for arguments objects (r=lw)

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This commit is contained in:
Tom Schuster
2010-10-06 12:04:31 -07:00
parent 8aa606de6b
commit cf12f7e90d
1 changed files with 13 additions and 1 deletions
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14
js/src/jsarray.cpp
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@@ -103,8 +103,9 @@
#include "jsvector.h"
#include "jsatominlines.h"
#include "jsobjinlines.h"
#include "jscntxtinlines.h"
#include "jsinterpinlines.h"
#include "jsobjinlines.h"
using namespace js;
using namespace js::gc;
@@ -456,6 +457,17 @@ GetArrayElement(JSContext *cx, JSObject *obj, jsdouble index, JSBool *hole,
*hole = JS_FALSE;
return JS_TRUE;
}
if (obj->isArguments() &&
index < obj->getArgsInitialLength() &&
!(*vp = obj->getArgsElement(uint32(index))).isMagic(JS_ARRAY_HOLE)) {
*hole = JS_FALSE;
JSStackFrame *fp = (JSStackFrame *)obj->getPrivate();
if (fp != JS_ARGUMENTS_OBJECT_ON_TRACE) {
if (fp)
*vp = fp->canonicalActualArg(index);
return JS_TRUE;
}
}
AutoIdRooter idr(cx);