Changeset 43559 in webkit for trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.h

Timestamp:

May 12, 2009, 1:58:56 AM (16 years ago)

Author:

[email protected]

Message:

Improve function call forwarding performance

Reviewed by Gavin Barraclough

Make creation of the Arguments object occur lazily, so it
is not necessarily created for every function that references
it. Then add logic to Function.apply to allow it to avoid
allocating the Arguments object at all. Helps a lot with
the function forwarding/binding logic in jQuery, Prototype,
and numerous other JS libraries.

File:

• trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.h (modified) (2 diffs)

trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.h

@@ -82 +82 @@
         // require explicit reference counting.
         RegisterID* registerFor(const Identifier&);
+        
+        bool willResolveToArguments(const Identifier&);
+        RegisterID* uncheckedRegisterForArguments();
 
         // Behaves as registerFor does, but ignores dynamic scope as
@@ -427 +430 @@
         RegisterID* emitThrowExpressionTooDeepException();
 
+        void createArgumentsIfNecessary();
+
         bool m_shouldEmitDebugHooks;
         bool m_shouldEmitProfileHooks;