[Interpreter] Add support for local context loads and stores.

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 <vector>
 
 #include "src/ast.h"
@@ skipping 12 matching lines @@
 class BytecodeLabel;
 class Register;
 
 class BytecodeArrayBuilder {
  public:
   BytecodeArrayBuilder(Isolate* isolate, Zone* zone);
   Handle<BytecodeArray> ToBytecodeArray();
 
   // Set number of parameters expected by function.
   void set_parameter_count(int number_of_params);
-  int parameter_count() const;
+  int parameter_count() const {
+    DCHECK_GE(parameter_count_, 0);
+    return parameter_count_;
+  }
 
   // Set number of locals required for bytecode array.
   void set_locals_count(int number_of_locals);
-  int locals_count() const;
+  int locals_count() const {
+    DCHECK_GE(local_register_count_, 0);
+    return local_register_count_;
+  }
 
   // Set number of contexts required for bytecode array.
   void set_context_count(int number_of_contexts);
-  int context_count() const;
+  int context_count() const {
+    DCHECK_GE(context_register_count_, 0);
+    return context_register_count_;
+  }
 
   Register first_context_register() const;
   Register last_context_register() const;
 
+  // Returns the number of fixed (non-temporary) registers.
+  int fixed_register_count() const { return context_count() + locals_count(); }
+
   Register Parameter(int parameter_index) const;
 
   // Constant loads to the accumulator.
   BytecodeArrayBuilder& LoadLiteral(v8::internal::Smi* value);
   BytecodeArrayBuilder& LoadLiteral(Handle<Object> object);
   BytecodeArrayBuilder& LoadUndefined();
   BytecodeArrayBuilder& LoadNull();
   BytecodeArrayBuilder& LoadTheHole();
   BytecodeArrayBuilder& LoadTrue();
   BytecodeArrayBuilder& LoadFalse();
 
   // Global loads to accumulator and stores from the accumulator.
   BytecodeArrayBuilder& LoadGlobal(int slot_index);
   BytecodeArrayBuilder& StoreGlobal(int slot_index, LanguageMode language_mode);
 
   // Load the object at |slot_index| in |context| into the accumulator.
   BytecodeArrayBuilder& LoadContextSlot(Register context, int slot_index);
 
+  // Stores the object in the accumulator into |slot_index| of |context|.
+  BytecodeArrayBuilder& StoreContextSlot(Register context, int slot_index);
+
   // Register-accumulator transfers.
   BytecodeArrayBuilder& LoadAccumulatorWithRegister(Register reg);
   BytecodeArrayBuilder& StoreAccumulatorInRegister(Register reg);
 
   // Load properties. The property name should be in the accumulator.
   BytecodeArrayBuilder& LoadNamedProperty(Register object, int feedback_slot,
                                           LanguageMode language_mode);
   BytecodeArrayBuilder& LoadKeyedProperty(Register object, int feedback_slot,
                                           LanguageMode language_mode);
 
@@ skipping 190 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope);
 };
 
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_