[Interpreter] Add implementations of arithmetic binary op bytecodes.

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/compiler.h"
 #include "src/compiler/interpreter-assembler.h"
 #include "src/factory.h"
 #include "src/interpreter/bytecode-generator.h"
@@ skipping 147 matching lines @@
       Unique<HeapObject>::CreateImmovable(isolate_->factory()->false_value()));
   __ SetAccumulator(false_value);
   __ Dispatch();
 }
 
 
 // Ldar <src>
 //
 // Load accumulator with value from register <src>.
 void Interpreter::DoLdar(compiler::InterpreterAssembler* assembler) {
-  Node* value = __ LoadRegister(__ BytecodeOperandReg(0));
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* value = __ LoadRegister(reg_index);
   __ SetAccumulator(value);
   __ Dispatch();
 }
 
 
 // Star <dst>
 //
 // Store accumulator to register <dst>.
 void Interpreter::DoStar(compiler::InterpreterAssembler* assembler) {
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* accumulator = __ GetAccumulator();
   __ StoreRegister(accumulator, reg_index);
   __ Dispatch();
 }
 
 
+void Interpreter::DoBinaryOp(Builtins::JavaScript binop_builtin,
+                             compiler::InterpreterAssembler* assembler) {
+  // TODO(rmcilroy): Call ICs which back-patch bytecode with type specialized
+  // operations, instead of calling builtins directly.
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* lhs = __ LoadRegister(reg_index);
+  Node* rhs = __ GetAccumulator();
+  Node* result = __ CallJSBuiltin(binop_builtin, lhs, rhs);
+  __ SetAccumulator(result);
+  __ Dispatch();
+}
+
+
 // Add <src>
 //
 // Add register <src> to accumulator.
 void Interpreter::DoAdd(compiler::InterpreterAssembler* assembler) {
-  // TODO(rmcilroy) Implement.
-  __ Dispatch();
+  DoBinaryOp(Builtins::ADD, assembler);
 }
 
 
 // Sub <src>
 //
 // Subtract register <src> from accumulator.
 void Interpreter::DoSub(compiler::InterpreterAssembler* assembler) {
-  // TODO(rmcilroy) Implement.
-  __ Dispatch();
+  DoBinaryOp(Builtins::SUB, assembler);
 }
 
 
 // Mul <src>
 //
 // Multiply accumulator by register <src>.
 void Interpreter::DoMul(compiler::InterpreterAssembler* assembler) {
-  // TODO(rmcilroy) Implement add register to accumulator.
-  __ Dispatch();
+  DoBinaryOp(Builtins::MUL, assembler);
 }
 
 
 // Div <src>
 //
 // Divide register <src> by accumulator.
 void Interpreter::DoDiv(compiler::InterpreterAssembler* assembler) {
-  // TODO(rmcilroy) Implement.
-  __ Dispatch();
+  DoBinaryOp(Builtins::DIV, assembler);
 }
 
 
+// Mod <src>
+//
+// Modulo register <src> by accumulator.
+void Interpreter::DoMod(compiler::InterpreterAssembler* assembler) {
+  DoBinaryOp(Builtins::MOD, assembler);
+}
+
+
 // Return
 //
 // Return the value in register 0.
 void Interpreter::DoReturn(compiler::InterpreterAssembler* assembler) {
   __ Return();
 }
 
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8