[Interpreter] Adds support for const/let variables to interpreter.

src/interpreter/interpreter.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/interpreter.h"
 
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/compiler/interpreter-assembler.h"
 #include "src/factory.h"
@@ skipping 1556 matching lines @@
 
 // JumpIfNullConstantWide <idx16>
 //
 // Jump by number of bytes in the Smi in the |idx16| entry in the constant pool
 // if the object referenced by the accumulator is the null constant.
 void Interpreter::DoJumpIfNullConstantWide(
     compiler::InterpreterAssembler* assembler) {
   DoJumpIfNullConstant(assembler);
 }
 
-
-// jumpifundefined <imm8>
+// JumpIfUndefined <imm8>
 //
 // Jump by number of bytes represented by an immediate operand if the object
 // referenced by the accumulator is the undefined constant.
 void Interpreter::DoJumpIfUndefined(compiler::InterpreterAssembler* assembler) {
   Node* accumulator = __ GetAccumulator();
   Node* undefined_value =
       __ HeapConstant(isolate_->factory()->undefined_value());
   Node* relative_jump = __ BytecodeOperandImm(0);
   __ JumpIfWordEqual(accumulator, undefined_value, relative_jump);
 }
@@ skipping 17 matching lines @@
 
 // JumpIfUndefinedConstantWide <idx16>
 //
 // Jump by number of bytes in the Smi in the |idx16| entry in the constant pool
 // if the object referenced by the accumulator is the undefined constant.
 void Interpreter::DoJumpIfUndefinedConstantWide(
     compiler::InterpreterAssembler* assembler) {
   DoJumpIfUndefinedConstant(assembler);
 }
 
+// JumpIfHole <imm8>
+//
+// Jump by number of bytes represented by an immediate operand if the object
+// referenced by the accumulator is the hole.
+void Interpreter::DoJumpIfHole(compiler::InterpreterAssembler* assembler) {
+  Node* accumulator = __ GetAccumulator();
+  Node* the_hole_value = __ HeapConstant(isolate_->factory()->the_hole_value());
+  Node* relative_jump = __ BytecodeOperandImm(0);
+  __ JumpIfWordEqual(accumulator, the_hole_value, relative_jump);
+}
+
+// JumpIfHole <imm8>
+//
+// Jump by number of bytes represented by an immediate operand if the object
+// referenced by the accumulator is not the hole.
+void Interpreter::DoJumpIfNotHole(compiler::InterpreterAssembler* assembler) {
+  // TODO(mythria): Implement with wordNotEquals.

[rmcilroy, 2016/01/26 14:37:28]

Any reason not to do that now?

[mythria, 2016/02/01 10:02:18]

Done.

+  Node* accumulator = __ GetAccumulator();
+  Node* the_hole_value = __ HeapConstant(isolate_->factory()->the_hole_value());
+  Node* result = __ CallRuntime(Runtime::kInterpreterStrictEquals, accumulator,
+                                the_hole_value);
+  Node* false_value = __ BooleanConstant(false);
+  Node* relative_jump = __ BytecodeOperandImm(0);
+  __ JumpIfWordEqual(result, false_value, relative_jump);
+}
 
 void Interpreter::DoCreateLiteral(Runtime::FunctionId function_id,
                                   compiler::InterpreterAssembler* assembler) {
   Node* index = __ BytecodeOperandIdx(0);
   Node* constant_elements = __ LoadConstantPoolEntry(index);
   Node* literal_index_raw = __ BytecodeOperandIdx(1);
   Node* literal_index = __ SmiTag(literal_index_raw);
   Node* flags_raw = __ BytecodeOperandImm(2);
   Node* flags = __ SmiTag(flags_raw);
   Node* closure = __ LoadRegister(Register::function_closure());
@@ skipping 231 matching lines @@
   Node* index_reg = __ BytecodeOperandReg(0);
   Node* index = __ LoadRegister(index_reg);
   Node* result = __ CallRuntime(Runtime::kForInStep, index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8