Changeset 42575 in webkit for trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp

Timestamp:

Apr 16, 2009, 5:01:31 AM (16 years ago)

Author:

[email protected]

Message:

Optimise op_resolve_base

Reviewed by Gavin Barraclough.

If we can statically find a property we are trying to resolve
the base of, the base is guaranteed to be the global object.

File:

• trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp (modified) (1 diff)

trunk/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp

@@ -1105 +1105 @@
 RegisterID* BytecodeGenerator::emitResolveBase(RegisterID* dst, const Identifier& property)
 {
-    emitOpcode(op_resolve_base);
-    instructions().append(dst->index());
-    instructions().append(addConstant(property));
-    return dst;
+    size_t depth = 0;
+    int index = 0;
+    JSObject* globalObject = 0;
+    findScopedProperty(property, index, depth, false, globalObject);
+    if (!globalObject) {
+        // We can't optimise at all :-(
+        emitOpcode(op_resolve_base);
+        instructions().append(dst->index());
+        instructions().append(addConstant(property));
+        return dst;
+    }
+
+    // Global object is the base
+    return emitLoadGlobalObject(dst, globalObject);
 }