[Interpreter] Add support for global declarations and load/store of global variables

src/interpreter/bytecodes.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/interpreter/bytecodes.h"
 
 #include "src/frames.h"
 #include "src/interpreter/bytecode-traits.h"
 
 namespace v8 {
@@ skipping 248 matching lines @@
 }
 
 
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size) {
   return os << Bytecodes::OperandSizeToString(operand_size);
 }
 
 
 static const int kLastParamRegisterIndex =
     -InterpreterFrameConstants::kLastParamFromRegisterPointer / kPointerSize;
+static const int kFunctionContextRegisterIndex =
+    -InterpreterFrameConstants::kContextFromRegisterPointer / kPointerSize;
 
 
 // Registers occupy range 0-127 in 8-bit value leaving 128 unused values.
 // Parameter indices are biased with the negative value kLastParamRegisterIndex
 // for ease of access in the interpreter.
 static const int kMaxParameterIndex = 128 + kLastParamRegisterIndex;
 
 
 Register Register::FromParameterIndex(int index, int parameter_count) {
   DCHECK_GE(index, 0);
   DCHECK_LT(index, parameter_count);
   DCHECK_LE(parameter_count, kMaxParameterIndex + 1);
   int register_index = kLastParamRegisterIndex - parameter_count + index + 1;
   DCHECK_LT(register_index, 0);
   DCHECK_GE(register_index, Register::kMinRegisterIndex);
   return Register(register_index);
 }
 
 
 int Register::ToParameterIndex(int parameter_count) const {
   DCHECK(is_parameter());
   return index() - kLastParamRegisterIndex + parameter_count - 1;
 }
 
 
+Register Register::function_context() {
+  return Register(kFunctionContextRegisterIndex);
+}
+
+
+bool Register::is_function_context() const {
+  return index() == kFunctionContextRegisterIndex;
+}
+
+
 int Register::MaxParameterIndex() { return kMaxParameterIndex; }
 
 
 uint8_t Register::ToOperand() const { return static_cast<uint8_t>(-index_); }
 
 
 Register Register::FromOperand(uint8_t operand) {
   return Register(-static_cast<int8_t>(operand));
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8