S390: [Interpreter] Make dispatch table point to code entry instead of code objects.

src/s390/builtins-s390.cc

 // Copyright 2014 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_S390
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1027 matching lines @@
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ mov(kInterpreterDispatchTableRegister,
          Operand(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ LoadlB(r3, MemOperand(kInterpreterBytecodeArrayRegister,
                            kInterpreterBytecodeOffsetRegister));
   __ ShiftLeftP(ip, r3, Operand(kPointerSizeLog2));
   __ LoadP(ip, MemOperand(kInterpreterDispatchTableRegister, ip));
-  // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
-  // and header removal.
-  __ AddP(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Call(ip);
 
   // Even though the first bytecode handler was called, we will never return.
   __ Abort(kUnexpectedReturnFromBytecodeHandler);
 }
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
   // TODO(rmcilroy): List of things not currently dealt with here but done in
   // fullcodegen's EmitReturnSequence.
   //  - Supporting FLAG_trace for Runtime::TraceExit.
@@ skipping 100 matching lines @@
            MemOperand(
                kInterpreterRegisterFileRegister,
                InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
   __ SmiUntag(kInterpreterBytecodeOffsetRegister);
 
   // Dispatch to the target bytecode.
   __ LoadlB(r3, MemOperand(kInterpreterBytecodeArrayRegister,
                            kInterpreterBytecodeOffsetRegister));
   __ ShiftLeftP(ip, r3, Operand(kPointerSizeLog2));
   __ LoadP(ip, MemOperand(kInterpreterDispatchTableRegister, ip));
-  __ AddP(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Jump(ip);
 }
 
 static void Generate_InterpreterNotifyDeoptimizedHelper(
     MacroAssembler* masm, Deoptimizer::BailoutType type) {
   // Enter an internal frame.
   {
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
 
     // Pass the deoptimization type to the runtime system.
@@ skipping 1482 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390