[Interpreter] Add support for new local function context creation.

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 18 matching lines @@
   Handle<BytecodeArray> ToBytecodeArray();
 
   // Set number of parameters expected by function.
   void set_parameter_count(int number_of_params);
   int parameter_count() const;
 
   // Set number of locals required for bytecode array.
   void set_locals_count(int number_of_locals);
   int locals_count() const;
 
-  Register Parameter(int parameter_index);
+  // Set number of contexts required for bytecode array.
+  void set_context_count(int number_of_contexts);
+  int context_count() const;
+
+  Register first_context_register() const;
+  Register last_context_register() const;
+
+  Register Parameter(int parameter_index) const;
 
   // Constant loads to accumulator.
   BytecodeArrayBuilder& LoadLiteral(v8::internal::Smi* value);
   BytecodeArrayBuilder& LoadLiteral(Handle<Object> object);
   BytecodeArrayBuilder& LoadUndefined();
   BytecodeArrayBuilder& LoadNull();
   BytecodeArrayBuilder& LoadTheHole();
   BytecodeArrayBuilder& LoadTrue();
   BytecodeArrayBuilder& LoadFalse();
 
@@ skipping 18 matching lines @@
   BytecodeArrayBuilder& StoreNamedProperty(Register object, Register name,
                                            int feedback_slot,
                                            LanguageMode language_mode);
   BytecodeArrayBuilder& StoreKeyedProperty(Register object, Register key,
                                            int feedback_slot,
                                            LanguageMode language_mode);
 
   // Create a new closure for the SharedFunctionInfo in the accumulator.
   BytecodeArrayBuilder& CreateClosure(PretenureFlag tenured);
 
+  // Push the context in accumulator as the new context, and store in register
+  // |context|.
+  BytecodeArrayBuilder& PushContext(Register context);
+  // Pop the current context and replace with |context|.
+  BytecodeArrayBuilder& PopContext(Register context);
+
   // Call a JS function. The JSFunction or Callable to be called should be in
   // |callable|, the receiver should be in |receiver| and all subsequent
   // arguments should be in registers <receiver + 1> to
   // <receiver + 1 + arg_count>.
   BytecodeArrayBuilder& Call(Register callable, Register receiver,
                              size_t arg_count);
 
   // Call the runtime function with |function_id|. The first argument should be
   // in |first_arg| and all subsequent arguments should be in registers
   // <first_arg + 1> to <first_arg + 1 + arg_count>.
@@ skipping 80 matching lines @@
   bool bytecode_generated_;
   size_t last_block_end_;
   size_t last_bytecode_start_;
   bool return_seen_in_block_;
 
   IdentityMap<size_t> constants_map_;
   ZoneVector<Handle<Object>> constants_;
 
   int parameter_count_;
   int local_register_count_;
+  int context_register_count_;
   int temporary_register_count_;
   int temporary_register_next_;
 
   friend class TemporaryRegisterScope;
   DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArrayBuilder);
 };
 
 
 // A label representing a branch target in a bytecode array. When a
 // label is bound, it represents a known position in the bytecode
@@ skipping 51 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope);
 };
 
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_