[Interpreter] Add support for for count operations.

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 573 matching lines @@
 // Right Shifts register <src> by the count specified in the accumulator.
 // Result is zero-filled. The accumulator and register <src> are converted to
 // uint32 before the operation 5 lsb bits from the accumulator are used as
 // count i.e. <src> << (accumulator & 0x1F).
 void Interpreter::DoShiftRightLogical(
     compiler::InterpreterAssembler* assembler) {
   DoBinaryOp(Runtime::kShiftRightLogical, assembler);
 }
 
 
+void Interpreter::DoCountOp(Runtime::FunctionId function_id,
+                            compiler::InterpreterAssembler* assembler) {
+  Node* value = __ GetAccumulator();
+  Node* one = __ NumberConstant(1);
+  Node* result = __ CallRuntime(function_id, value, one);
+  __ SetAccumulator(result);
+  __ Dispatch();
+}
+
+
+// Inc
+//
+// Increments value in the accumulator by one.
+void Interpreter::DoInc(compiler::InterpreterAssembler* assembler) {
+  DoCountOp(Runtime::kAdd, assembler);
+}
+
+
+// Dec
+//
+// Decrements value in the accumulator by one.
+void Interpreter::DoDec(compiler::InterpreterAssembler* assembler) {
+  DoCountOp(Runtime::kSubtract, assembler);
+}
+
+
 // LogicalNot
 //
 // Perform logical-not on the accumulator, first casting the
 // accumulator to a boolean value if required.
 void Interpreter::DoLogicalNot(compiler::InterpreterAssembler* assembler) {
   Node* accumulator = __ GetAccumulator();
   Node* result = __ CallRuntime(Runtime::kInterpreterLogicalNot, accumulator);
   __ SetAccumulator(result);
   __ Dispatch();
 }
@@ skipping 165 matching lines @@
 //
 // Cast the object referenced by the accumulator to a name.
 void Interpreter::DoToName(compiler::InterpreterAssembler* assembler) {
   Node* accumulator = __ GetAccumulator();
   Node* result = __ CallRuntime(Runtime::kToName, accumulator);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 
+// ToNumber
+//
+// Cast the object referenced by the accumulator to a number.
+void Interpreter::DoToNumber(compiler::InterpreterAssembler* assembler) {
+  Node* accumulator = __ GetAccumulator();
+  Node* result = __ CallRuntime(Runtime::kToNumber, accumulator);
+  __ SetAccumulator(result);
+  __ Dispatch();
+}
+
+
 // Jump <imm8>
 //
 // Jump by number of bytes represented by the immediate operand |imm8|.
 void Interpreter::DoJump(compiler::InterpreterAssembler* assembler) {
   Node* relative_jump = __ BytecodeOperandImm8(0);
   __ Jump(relative_jump);
 }
 
 
 // JumpConstant <idx>
@@ skipping 217 matching lines @@
 //
 // Return the value in the accumulator.
 void Interpreter::DoReturn(compiler::InterpreterAssembler* assembler) {
   __ Return();
 }
 
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8