[Interpreter] Make dispatch table point to code entry instead of code objects.

src/ia32/builtins-ia32.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 594 matching lines @@
   __ push(ebx);
 
   // Dispatch to the first bytecode handler for the function.
   __ movzx_b(eax, Operand(kInterpreterBytecodeArrayRegister,
                           kInterpreterBytecodeOffsetRegister, times_1, 0));
   __ mov(ebx, Operand(ebx, eax, times_pointer_size, 0));
   // Restore undefined_value in accumulator (eax)
   // TODO(rmcilroy): Remove this once we move the dispatch table back into a
   // register.
   __ mov(eax, Immediate(masm->isolate()->factory()->undefined_value()));
-  // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
-  // and header removal.
-  __ add(ebx, Immediate(Code::kHeaderSize - kHeapObjectTag));
   __ call(ebx);
 
   // Even though the first bytecode handler was called, we will never return.
   __ Abort(kUnexpectedReturnFromBytecodeHandler);
 
   // Load debug copy of the bytecode array.
   __ bind(&load_debug_bytecode_array);
   Register debug_info = kInterpreterBytecodeArrayRegister;
   __ mov(debug_info, FieldOperand(eax, SharedFunctionInfo::kDebugInfoOffset));
   __ mov(kInterpreterBytecodeArrayRegister,
@@ skipping 147 matching lines @@
 
   // Dispatch to the target bytecode.
   __ movzx_b(esi, Operand(kInterpreterBytecodeArrayRegister,
                           kInterpreterBytecodeOffsetRegister, times_1, 0));
   __ mov(ebx, Operand(ebx, esi, times_pointer_size, 0));
 
   // Get the context from the frame.
   __ mov(kContextRegister,
          Operand(kInterpreterRegisterFileRegister,
                  InterpreterFrameConstants::kContextFromRegisterPointer));
-
-  // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
-  // and header removal.
-  __ add(ebx, Immediate(Code::kHeaderSize - kHeapObjectTag));
   __ jmp(ebx);
 }
 
 
 static void Generate_InterpreterNotifyDeoptimizedHelper(
     MacroAssembler* masm, Deoptimizer::BailoutType type) {
   // Enter an internal frame.
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
 
@@ skipping 1923 matching lines @@
   // And "return" to the OSR entry point of the function.
   __ ret(0);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32