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Bug 785576 - Mark dense array properties as 'own'. (r=bhackett)

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This commit is contained in:
Eric Faust 2012-08-27 13:34:52 -04:00
parent 6a76ab17b2
commit a448289ba6
1 changed files with 8 additions and 3 deletions
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11
js/src/jsinfer.cpp
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@ -1087,9 +1087,14 @@ PropertyAccess(JSContext *cx, JSScript *script, jsbytecode *pc, TypeObject *obje
}
}
/* Capture the effects of a standard property access. Never mark the
* property as own, as it may have inherited accessors. */
HeapTypeSet *types = object->getProperty(cx, id, false);
/*
* Capture the effects of a standard property access. For assignments, we do not
* automatically update the 'own' bit on accessed properties, except for indexed
* elements in dense arrays. The latter exception allows for JIT fast paths to avoid
* testing the array's type when assigning to dense array elements.
*/
bool markOwn = access == PROPERTY_WRITE && JSID_IS_VOID(id);
HeapTypeSet *types = object->getProperty(cx, id, markOwn);
if (!types)
return;
if (access == PROPERTY_WRITE) {