Changeset 37859 in webkit for trunk/JavaScriptCore/kjs/JSFunction.cpp

Timestamp:

Oct 24, 2008, 1:44:58 PM (17 years ago)

Author:

[email protected]

Message:

2008-10-24 Cameron Zwarich <​[email protected]>

Reviewed by Maciej Stachowiak.

Bug 21862: Create JSFunction prototype property lazily
<​https://bugs.webkit.org/show_bug.cgi?id=21862>

This is a 1.5% speedup on SunSpider and a 1.4% speedup on the V8
benchmark suite, including a 3.8% speedup on Earley-Boyer.

• kjs/JSFunction.cpp: (JSC::JSFunction::getOwnPropertySlot):
• kjs/nodes.cpp: (JSC::FuncDeclNode::makeFunction): (JSC::FuncExprNode::makeFunction):

File:

• trunk/JavaScriptCore/kjs/JSFunction.cpp (modified) (1 diff)

trunk/JavaScriptCore/kjs/JSFunction.cpp

@@ -103 +103 @@
 bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
 {
+    if (propertyName == exec->propertyNames().prototype) {
+        JSValue** location = getDirectLocation(propertyName);
+
+        if (!location) {
+            JSObject* prototype = new (exec) JSObject(m_scopeChain.globalObject()->emptyObjectStructure());
+            prototype->putDirect(exec->propertyNames().constructor, this, DontEnum);
+            putDirect(exec->propertyNames().prototype, prototype, DontDelete);
+            location = getDirectLocation(propertyName);
+        }
+
+        slot.setValueSlot(this, location, offsetForLocation(location));
+    }
+
     if (propertyName == exec->propertyNames().arguments) {
         slot.setCustom(this, argumentsGetter);