Changeset 36368 in webkit for trunk/JavaScriptCore/kjs/StructureID.h

Timestamp:

Sep 12, 2008, 9:57:35 PM (17 years ago)

Author:

[email protected]

Message:

2008-09-12 Cameron Zwarich <​[email protected]>

Reviewed by Maciej Stachowiak.

Bug 20819: JSValue::isObject() is slow
<​https://bugs.webkit.org/show_bug.cgi?id=20819>

Optimize JSCell::isObject() and JSCell::isString() by making them
non-virtual calls that rely on the StructureID type information.

This is a 0.7% speedup on SunSpider and a 1.0% speedup on the V8
benchmark suite.

• JavaScriptCore.exp:
• kjs/JSCell.cpp:
• kjs/JSCell.h: (JSC::JSCell::isObject): (JSC::JSCell::isString):
• kjs/JSObject.cpp:
• kjs/JSObject.h:
• kjs/JSString.cpp:
• kjs/JSString.h: (JSC::JSString::JSString):
• kjs/StructureID.h: (JSC::StructureID::type):

File:

• trunk/JavaScriptCore/kjs/StructureID.h (modified) (1 diff)

trunk/JavaScriptCore/kjs/StructureID.h

@@ -94 +94 @@
         bool isDictionary() const { return m_isDictionary; }
 
+        JSType type() const { return m_type; }
+
         JSValue* storedPrototype() const { return m_prototype; }
         JSValue* prototypeForLookup(ExecState*);