Implement code stub for object literal creation.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2011 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 4145 matching lines @@
         ? FastCloneShallowArrayStub::CLONE_DOUBLE_ELEMENTS
         : FastCloneShallowArrayStub::CLONE_ELEMENTS;
     FastCloneShallowArrayStub stub(mode, length);
     CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
 void LCodeGen::DoObjectLiteral(LObjectLiteral* instr) {
   ASSERT(ToRegister(instr->context()).is(esi));
+  Handle<FixedArray> constant_properties =
+      instr->hydrogen()->constant_properties();
+
   // Setup the parameters to the stub/runtime call.
   __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(eax, JSFunction::kLiteralsOffset));
   __ push(Immediate(Smi::FromInt(instr->hydrogen()->literal_index())));
-  __ push(Immediate(instr->hydrogen()->constant_properties()));
+  __ push(Immediate(constant_properties));
   int flags = instr->hydrogen()->fast_elements()
       ? ObjectLiteral::kFastElements
       : ObjectLiteral::kNoFlags;
   flags |= instr->hydrogen()->has_function()
       ? ObjectLiteral::kHasFunction
       : ObjectLiteral::kNoFlags;
   __ push(Immediate(Smi::FromInt(flags)));
 
-  // Pick the right runtime function to call.
+  // Pick the right runtime function or stub to call.
+  int properties_count = constant_properties->length() / 2;
   if (instr->hydrogen()->depth() > 1) {
     CallRuntime(Runtime::kCreateObjectLiteral, 4, instr);
+  } else if (flags != ObjectLiteral::kFastElements ||
+      properties_count > FastCloneShallowObjectStub::kMaximumClonedProperties) {
+    CallRuntime(Runtime::kCreateObjectLiteralShallow, 4, instr);
   } else {
-    CallRuntime(Runtime::kCreateObjectLiteralShallow, 4, instr);
+    FastCloneShallowObjectStub stub(properties_count);
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
   }
 }
 
 
 void LCodeGen::DoToFastProperties(LToFastProperties* instr) {
   ASSERT(ToRegister(instr->InputAt(0)).is(eax));
   __ push(eax);
   CallRuntime(Runtime::kToFastProperties, 1, instr);
 }
 
@@ skipping 347 matching lines @@
       this, pointers, Safepoint::kLazyDeopt);
   __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION, safepoint_generator);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32