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Bug 893897. Don't deoptimize typeobjects in TypeScript::MonitorAssign if they only have a few properties. r=bhackett

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This commit is contained in:
Boris Zbarsky 2013-07-16 01:32:18 -04:00
parent e9e910b57d
commit 53cee71509
1 changed files with 8 additions and 1 deletions
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9
js/src/jsinferinlines.h
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@ -966,7 +966,14 @@ TypeScript::MonitorAssign(JSContext *cx, HandleObject obj, jsid id)
uint32_t i;
if (js_IdIsIndex(id, &i))
return;
MarkTypeObjectUnknownProperties(cx, obj->type());
// But if we don't have too many properties yet, don't do anything. The
// idea here is that normal object initialization should not trigger
// deoptimization in most cases, while actual usage as a hashmap should.
TypeObject* type = obj->type();
if (type->getPropertyCount() < 8)
return;
MarkTypeObjectUnknownProperties(cx, type);
}
}