Introduce bytecodes for assisting generator suspend and resume.

src/interpreter/interpreter-assembler.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_INTERPRETER_ASSEMBLER_H_
 #define V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 
 #include "src/allocation.h"
 #include "src/base/smart-pointers.h"
 #include "src/builtins.h"
@@ skipping 32 matching lines @@
   compiler::Node* BytecodeOperandRuntimeId(int operand_index);
 
   // Accumulator.
   compiler::Node* GetAccumulator();
   void SetAccumulator(compiler::Node* value);
 
   // Context.
   compiler::Node* GetContext();
   void SetContext(compiler::Node* value);
 
+  // Number of registers.
+  compiler::Node* RegisterCount();
+
+  // Backup/restore register file to/from a fixed array.
+  compiler::Node* ExportRegisterFile();
+  compiler::Node* ImportRegisterFile(compiler::Node* array);
+
   // Loads from and stores to the interpreter register file.
   compiler::Node* LoadRegister(Register reg);
   compiler::Node* LoadRegister(compiler::Node* reg_index);
   compiler::Node* StoreRegister(compiler::Node* value, Register reg);
   compiler::Node* StoreRegister(compiler::Node* value,
                                 compiler::Node* reg_index);
 
   // Returns the next consecutive register.
   compiler::Node* NextRegister(compiler::Node* reg_index);
 
   // Returns the location in memory of the register |reg_index| in the
   // interpreter register file.
   compiler::Node* RegisterLocation(compiler::Node* reg_index);
 
   // Load constant at |index| in the constant pool.
   compiler::Node* LoadConstantPoolEntry(compiler::Node* index);
 
-  // Load a field from an object on the heap.
-  compiler::Node* LoadObjectField(compiler::Node* object, int offset);
-
   // Load |slot_index| from |context|.
   compiler::Node* LoadContextSlot(compiler::Node* context, int slot_index);
   compiler::Node* LoadContextSlot(compiler::Node* context,
                                   compiler::Node* slot_index);
   // Stores |value| into |slot_index| of |context|.
   compiler::Node* StoreContextSlot(compiler::Node* context,
                                    compiler::Node* slot_index,
                                    compiler::Node* value);
 
   // Load the TypeFeedbackVector for the current function.
@@ skipping 152 matching lines @@
   compiler::Node* stack_pointer_before_call_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_