[interpreter] move the dispatch table off heap.

src/x64/builtins-x64.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_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 660 matching lines @@
   //  - Code aging of the BytecodeArray object.
 
   // Load accumulator, register file, bytecode offset, dispatch table into
   // registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
   __ movp(kInterpreterRegisterFileRegister, rbp);
   __ addp(kInterpreterRegisterFileRegister,
           Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ movp(kInterpreterBytecodeOffsetRegister,
           Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ addp(kInterpreterDispatchTableRegister,
-          Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ Move(
+      kInterpreterDispatchTableRegister,
+      ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
 
   // Dispatch to the first bytecode handler for the function.
   __ movzxbp(rbx, Operand(kInterpreterBytecodeArrayRegister,
                           kInterpreterBytecodeOffsetRegister, times_1, 0));
   __ movp(rbx, Operand(kInterpreterDispatchTableRegister, rbx,
                        times_pointer_size, 0));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
   __ addp(rbx, Immediate(Code::kHeaderSize - kHeapObjectTag));
   __ call(rbx);
@@ skipping 103 matching lines @@
   // Call the constructor (rax, rdx, rdi passed on).
   __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ movp(kInterpreterRegisterFileRegister, rbp);
   __ addp(kInterpreterRegisterFileRegister,
           Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ addp(kInterpreterDispatchTableRegister,
-          Immediate(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ Move(
+      kInterpreterDispatchTableRegister,
+      ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
 
   // Get the context from the frame.
   __ movp(kContextRegister,
           Operand(kInterpreterRegisterFileRegister,
                   InterpreterFrameConstants::kContextFromRegisterPointer));
 
   // Get the bytecode array pointer from the frame.
   __ movp(rbx,
           Operand(kInterpreterRegisterFileRegister,
                   InterpreterFrameConstants::kFunctionFromRegisterPointer));
@@ skipping 2032 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64