[Interpreter] Adds delete operator to interpreter.

src/interpreter/bytecode-array-builder.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/bytecode-array-builder.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
@@ skipping 615 matching lines @@
 BytecodeArrayBuilder& BytecodeArrayBuilder::CallRuntime(
     Runtime::FunctionId function_id, Register first_arg, size_t arg_count) {
   DCHECK(FitsInIdx16Operand(function_id));
   DCHECK(FitsInIdx8Operand(arg_count));
   Output(Bytecode::kCallRuntime, static_cast<uint16_t>(function_id),
          first_arg.ToOperand(), static_cast<uint8_t>(arg_count));
   return *this;
 }
 
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::Delete(Register object,
+                                                   LanguageMode language_mode) {
+  Bytecode bytecode = (language_mode == STRICT)

[rmcilroy, 2015/10/21 14:52:54]

Could you move this code into a BytecodeForDelete function similar to
BytecodeForStoreGlobal, with a switch on language_mode and an explicitly
UNIMPLEMENTED for STRONG and UNREACHABLE for default.

[mythria, 2015/10/23 14:48:00]

Done.

+                          ? Bytecode::kDeletePropertyStrict
+                          : Bytecode::kDeletePropertySloppy;
+  Output(bytecode, object.ToOperand());
+  return *this;
+}
+
+
 size_t BytecodeArrayBuilder::GetConstantPoolEntry(Handle<Object> object) {
   // These constants shouldn't be added to the constant pool, the should use
   // specialzed bytecodes instead.
   DCHECK(!object.is_identical_to(isolate_->factory()->undefined_value()));
   DCHECK(!object.is_identical_to(isolate_->factory()->null_value()));
   DCHECK(!object.is_identical_to(isolate_->factory()->the_hole_value()));
   DCHECK(!object.is_identical_to(isolate_->factory()->true_value()));
   DCHECK(!object.is_identical_to(isolate_->factory()->false_value()));
 
   size_t* entry = constants_map_.Find(object);
@@ skipping 239 matching lines @@
 
 Register TemporaryRegisterScope::NewRegister() {
   count_++;
   last_register_index_ = builder_->BorrowTemporaryRegister();
   return Register(last_register_index_);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8