Provide baseline for experimental GC implementation.

src/arm/ic-arm.cc

 // Copyright 2006-2008 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 245 matching lines @@
          PropertyDetails::AttributesField::encode(READ_ONLY)) << kSmiTagSize;
   __ ldr(scratch1, FieldMemOperand(scratch2, kDetailsOffset));
   __ tst(scratch1, Operand(kTypeAndReadOnlyMask));
   __ b(ne, miss);
 
   // Store the value at the masked, scaled index and return.
   const int kValueOffset = kElementsStartOffset + kPointerSize;
   __ add(scratch2, scratch2, Operand(kValueOffset - kHeapObjectTag));
   __ str(value, MemOperand(scratch2));
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Update the write barrier. Make sure not to clobber the value.
   __ mov(scratch1, value);
   __ RecordWrite(elements, scratch2, scratch1);
+#endif
 }
 
 
 static void GenerateNumberDictionaryLoad(MacroAssembler* masm,
                                          Label* miss,
                                          Register elements,
                                          Register key,
                                          Register result,
                                          Register t0,
                                          Register t1,
@@ skipping 766 matching lines @@
   if (map != Heap::null_value()) {
     // Patch the offset in the actual store instruction.
     Address str_property_instr_address =
         ldr_map_instr_address + 3 * Assembler::kInstrSize;
     Instr str_property_instr = Assembler::instr_at(str_property_instr_address);
     ASSERT(Assembler::IsStrRegisterImmediate(str_property_instr));
     str_property_instr = Assembler::SetStrRegisterImmediateOffset(
         str_property_instr, offset - kHeapObjectTag);
     Assembler::instr_at_put(str_property_instr_address, str_property_instr);
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
     // Patch the offset in the add instruction that is part of the
     // write barrier.
     Address add_offset_instr_address =
         str_property_instr_address + Assembler::kInstrSize;
     Instr add_offset_instr = Assembler::instr_at(add_offset_instr_address);
     ASSERT(Assembler::IsAddRegisterImmediate(add_offset_instr));
     add_offset_instr = Assembler::SetAddRegisterImmediateOffset(
         add_offset_instr, offset - kHeapObjectTag);
     Assembler::instr_at_put(add_offset_instr_address, add_offset_instr);
+#endif
 
     // Indicate that code has changed.
     CPU::FlushICache(str_property_instr_address, 2 * Assembler::kInstrSize);
   }
 
   // Patch the map check.
   Assembler::set_target_address_at(ldr_map_instr_address,
                                    reinterpret_cast<Address>(map));
 
   return true;
@@ skipping 745 matching lines @@
   // Fall through to fast case.
 
   __ bind(&fast);
   // Fast case, store the value to the elements backing store.
   __ add(r5, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ add(r5, r5, Operand(key, LSL, kPointerSizeLog2 - kSmiTagSize));
   __ str(value, MemOperand(r5));
   // Skip write barrier if the written value is a smi.
   __ tst(value, Operand(kSmiTagMask));
   __ Ret(eq);
+
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Update write barrier for the elements array address.
   __ sub(r4, r5, Operand(elements));
   __ RecordWrite(elements, Operand(r4), r5, r6);
+#endif
 
   __ Ret();
 }
 
 
 // Convert and store int passed in register ival to IEEE 754 single precision
 // floating point value at memory location (dst + 4 * wordoffset)
 // If VFP3 is available use it for conversion.
 static void StoreIntAsFloat(MacroAssembler* masm,
                             Register dst,
@@ skipping 537 matching lines @@
            GetStateName(previous_state),
            GetStateName(state),
            Token::Name(op_));
   }
 #endif
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM