[interpreter] Support for ES6 class literals.

src/compiler/bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/bytecode-graph-builder.h"
 
 #include "src/compiler/bytecode-branch-analysis.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/operator-properties.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 960 matching lines @@
 void BytecodeGraphBuilder::VisitKeyedStoreICSloppyWide() {
   DCHECK(is_sloppy(language_mode()));
   BuildKeyedStore();
 }
 
 void BytecodeGraphBuilder::VisitKeyedStoreICStrictWide() {
   DCHECK(is_strict(language_mode()));
   BuildKeyedStore();
 }
 
+void BytecodeGraphBuilder::VisitLdaInitialMap() {
+  FrameStateBeforeAndAfter states(this);

[Michael Starzinger, 2016/02/04 13:40:20]

nit: Shouldn't need a frame state. Can we drop this line?

[oth, 2016/02/04 14:00:59]

Done.

+  Node* js_function = environment()->LookupAccumulator();
+  environment()->BindAccumulator(BuildLoadObjectField(

[Michael Starzinger, 2016/02/04 13:40:20]

nit: This is a dangerous pattern, because C++ does not specify whether
"environment()" or "BuildLoadObjectField()" is evaluated first. So if the latter
modifies the current environment, then we are relying on implementation-specific
behavior here. Can we instead pull out the result into a local variable?

[oth, 2016/02/04 14:00:59]

Thanks, aware of the issue. Hadn't thought this instance through.

+      js_function, JSFunction::kPrototypeOrInitialMapOffset));
+}
+
 void BytecodeGraphBuilder::VisitPushContext() {
   Node* new_context = environment()->LookupAccumulator();
   environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0),
                               environment()->Context());
   environment()->SetContext(new_context);
 }
 
 void BytecodeGraphBuilder::VisitPopContext() {
   Node* context =
       environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
@@ skipping 843 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8