Provide baseline for experimental GC implementation.

src/x64/macro-assembler-x64.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 63 matching lines @@
 
   void LoadRoot(Register destination, Heap::RootListIndex index);
   void CompareRoot(Register with, Heap::RootListIndex index);
   void CompareRoot(Operand with, Heap::RootListIndex index);
   void PushRoot(Heap::RootListIndex index);
   void StoreRoot(Register source, Heap::RootListIndex index);
 
   // ---------------------------------------------------------------------------
   // GC Support
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // For page containing |object| mark region covering |addr| dirty.
   // RecordWriteHelper only works if the object is not in new
   // space.
   void RecordWriteHelper(Register object,
                          Register addr,
                          Register scratch);
 
   // Check if object is in new space. The condition cc can be equal or
   // not_equal. If it is equal a jump will be done if the object is on new
   // space. The register scratch can be object itself, but it will be clobbered.
@@ skipping 27 matching lines @@
   // For page containing |object| mark region covering [object+offset] dirty.
   // The value is known to not be a smi.
   // object is the object being stored into, value is the object being stored.
   // If offset is zero, then the scratch register contains the array index into
   // the elements array represented as an untagged 32-bit integer.
   // All registers are clobbered by the operation.
   void RecordWriteNonSmi(Register object,
                          int offset,
                          Register value,
                          Register scratch);
+#endif
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // ---------------------------------------------------------------------------
   // Debugger Support
 
   void DebugBreak();
 #endif
 
   // ---------------------------------------------------------------------------
   // Activation frames
@@ skipping 1500 matching lines @@
   andl(scratch2, Immediate(kFlatAsciiStringMask));
   // Interleave the bits to check both scratch1 and scratch2 in one test.
   ASSERT_EQ(0, kFlatAsciiStringMask & (kFlatAsciiStringMask << 3));
   lea(scratch1, Operand(scratch1, scratch2, times_8, 0));
   cmpl(scratch1,
        Immediate(kFlatAsciiStringTag + (kFlatAsciiStringTag << 3)));
   j(not_equal, on_fail);
 }
 
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
 template <typename LabelType>
 void MacroAssembler::InNewSpace(Register object,
                                 Register scratch,
                                 Condition cc,
                                 LabelType* branch) {
   if (Serializer::enabled()) {
     // Can't do arithmetic on external references if it might get serialized.
     // The mask isn't really an address.  We load it as an external reference in
     // case the size of the new space is different between the snapshot maker
     // and the running system.
@@ skipping 14 matching lines @@
     movq(kScratchRegister, -new_space_start, RelocInfo::NONE);
     if (scratch.is(object)) {
       addq(scratch, kScratchRegister);
     } else {
       lea(scratch, Operand(object, kScratchRegister, times_1, 0));
     }
     and_(scratch, Immediate(static_cast<int32_t>(Heap::NewSpaceMask())));
     j(cc, branch);
   }
 }
-
+#endif
 
 template <typename LabelType>
 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
                                     const ParameterCount& actual,
                                     Handle<Code> code_constant,
                                     Register code_register,
                                     LabelType* done,
                                     InvokeFlag flag) {
   bool definitely_matches = false;
   NearLabel invoke;
@@ skipping 50 matching lines @@
       Jump(adaptor, RelocInfo::CODE_TARGET);
     }
     bind(&invoke);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_