[interpreter] move the dispatch table off heap.

src/ppc/builtins-ppc.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_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1021 matching lines @@
   //  - Allow simulator stop operations if FLAG_stop_at is set.
   //  - Code aging of the BytecodeArray object.
 
   // Load accumulator, register file, bytecode offset, dispatch table into
   // registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
   __ addi(kInterpreterRegisterFileRegister, fp,
           Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ mov(kInterpreterBytecodeOffsetRegister,
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ addi(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
-          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ mov(kInterpreterDispatchTableRegister,
+         Operand(ExternalReference::interpreter_dispatch_table_address(
+             masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
                          kInterpreterBytecodeOffsetRegister));
   __ ShiftLeftImm(ip, r4, Operand(kPointerSizeLog2));
   __ LoadPX(ip, MemOperand(kInterpreterDispatchTableRegister, ip));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
   __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Call(ip);
@@ skipping 78 matching lines @@
 
   // Call the constructor with r3, r4, and r6 unmodified.
   __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ addi(kInterpreterRegisterFileRegister, fp,
           Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ addi(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
-          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ mov(kInterpreterDispatchTableRegister,
+         Operand(ExternalReference::interpreter_dispatch_table_address(
+             masm->isolate())));
 
   // Get the context from the frame.
   __ LoadP(kContextRegister,
            MemOperand(kInterpreterRegisterFileRegister,
                       InterpreterFrameConstants::kContextFromRegisterPointer));
 
   // Get the bytecode array pointer from the frame.
   __ LoadP(r4,
            MemOperand(kInterpreterRegisterFileRegister,
                       InterpreterFrameConstants::kFunctionFromRegisterPointer));
@@ skipping 1599 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC