Fix a bug that prevents constants from overwriting function values in object ...

src/ia32/codegen-ia32.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5541 matching lines @@
   // Should the object literal have fast elements?
   frame_->Push(Smi::FromInt(node->fast_elements() ? 1 : 0));
   Result clone;
   if (node->depth() > 1) {
     clone = frame_->CallRuntime(Runtime::kCreateObjectLiteral, 4);
   } else {
     clone = frame_->CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
   }
   frame_->Push(&clone);
 
+  // Mark all computed expressions that are bound to a key that
+  // is shadowed by a later occurrence of the same key. For the
+  // marked expressions, no store code is emitted.
+  node->CalculateEmitStore();
+
   for (int i = 0; i < node->properties()->length(); i++) {
     ObjectLiteral::Property* property = node->properties()->at(i);
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
         break;
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
         if (CompileTimeValue::IsCompileTimeValue(property->value())) break;
         // else fall through.
       case ObjectLiteral::Property::COMPUTED: {
         Handle<Object> key(property->key()->handle());
         if (key->IsSymbol()) {
           // Duplicate the object as the IC receiver.
           frame_->Dup();
           Load(property->value());
-          Result ignored =
-              frame_->CallStoreIC(Handle<String>::cast(key), false);
-          // A test eax instruction following the store IC call would
-          // indicate the presence of an inlined version of the
-          // store. Add a nop to indicate that there is no such
-          // inlined version.
-          __ nop();
+          if (property->emit_store()) {
+            Result ignored =
+                frame_->CallStoreIC(Handle<String>::cast(key), false);
+            // A test eax instruction following the store IC call would
+            // indicate the presence of an inlined version of the
+            // store. Add a nop to indicate that there is no such
+            // inlined version.
+            __ nop();
+          } else {
+            frame_->Drop(2);
+          }
           break;
         }
         // Fall through
       }
       case ObjectLiteral::Property::PROTOTYPE: {
-        // Duplicate the object as an argument to the runtime call.
-        frame_->Dup();
-        Load(property->key());
-        Load(property->value());
-        Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 3);
-        // Ignore the result.
+          // Duplicate the object as an argument to the runtime call.
+          frame_->Dup();
+          Load(property->key());
+          Load(property->value());
+          if (property->emit_store()) {
+            // Ignore the result.
+            Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 3);
+          } else {
+            frame_->Drop(3);
+          }
         break;
       }
       case ObjectLiteral::Property::SETTER: {
         // Duplicate the object as an argument to the runtime call.
         frame_->Dup();
         Load(property->key());
         frame_->Push(Smi::FromInt(1));
         Load(property->value());
         Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4);
         // Ignore the result.
@@ skipping 4533 matching lines @@
   masm.GetCode(&desc);
   // Call the function from C++.
   return FUNCTION_CAST<MemCopyFunction>(buffer);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32