[ignition,modules] Introduce bytecodes for loading/storing module variables.

src/interpreter/bytecode-array-builder.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
@@ skipping 81 matching lines @@
   // Load the object at |slot_index| at |depth| in the context chain starting
   // with |context| into the accumulator.
   BytecodeArrayBuilder& LoadContextSlot(Register context, int slot_index,
                                         int depth);
 
   // Stores the object in the accumulator into |slot_index| at |depth| in the
   // context chain starting with |context|.
   BytecodeArrayBuilder& StoreContextSlot(Register context, int slot_index,
                                          int depth);
 
+  // Load from/store to the module variable with the given index.

[rmcilroy, 2016/11/03 13:58:06]

nit - load from accumulator / store accumulator to the...

[neis, 2016/11/04 10:37:23]

It loads from the module variable, not from the accumulator.  I tried to make it
clearer now.

+  BytecodeArrayBuilder& LoadModuleVariable(int index);
+  BytecodeArrayBuilder& StoreModuleVariable(int index);
+
   // Register-accumulator transfers.
   BytecodeArrayBuilder& LoadAccumulatorWithRegister(Register reg);
   BytecodeArrayBuilder& StoreAccumulatorInRegister(Register reg);
 
   // Register-register transfer.
   BytecodeArrayBuilder& MoveRegister(Register from, Register to);
 
   // Named load property.
   BytecodeArrayBuilder& LoadNamedProperty(Register object,
                                           const Handle<Name> name,
@@ skipping 291 matching lines @@
   static int const kNoFeedbackSlot = 0;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_