Provide baseline for experimental GC implementation.

src/ia32/ic-ia32.cc

 // 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 246 matching lines @@
   __ test(Operand(elements, r0, times_4, kDetailsOffset - kHeapObjectTag),
           Immediate(kTypeAndReadOnlyMask));
   __ j(not_zero, miss_label, not_taken);
 
   // Store the value at the masked, scaled index.
   const int kValueOffset = kElementsStartOffset + kPointerSize;
   __ lea(r0, Operand(elements, r0, times_4, kValueOffset - kHeapObjectTag));
   __ mov(Operand(r0, 0), value);
 
   // Update write barrier. Make sure not to clobber the value.
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   __ mov(r1, value);
   __ RecordWrite(elements, r0, r1);
+#endif
 }
 
 
 static void GenerateNumberDictionaryLoad(MacroAssembler* masm,
                                          Label* miss,
                                          Register elements,
                                          Register key,
                                          Register r0,
                                          Register r1,
                                          Register r2,
@@ skipping 738 matching lines @@
   __ cmp(ecx, FieldOperand(edx, JSArray::kLengthOffset));  // Compare smis.
   __ j(above_equal, &extra, not_taken);
 
   // Fast case: Do the store.
   __ bind(&fast);
   // eax: value
   // ecx: key (a smi)
   // edx: receiver
   // edi: FixedArray receiver->elements
   __ mov(CodeGenerator::FixedArrayElementOperand(edi, ecx), eax);
+
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Update write barrier for the elements array address.
   __ mov(edx, Operand(eax));
   __ RecordWrite(edi, 0, edx, ecx);
+#endif
   __ ret(0);
 }
 
 
 void KeyedStoreIC::GenerateExternalArray(MacroAssembler* masm,
                                          ExternalArrayType array_type) {
   // ----------- S t a t e -------------
   //  -- eax    : value
   //  -- ecx    : key
   //  -- edx    : receiver
@@ skipping 681 matching lines @@
       address + Assembler::kCallTargetAddressOffset;
 
   // If the instruction following the call is not a test eax, nothing
   // was inlined.
   if (*test_instruction_address != Assembler::kTestEaxByte) return false;
 
   // Extract the encoded deltas from the test eax instruction.
   Address encoded_offsets_address = test_instruction_address + 1;
   int encoded_offsets = *reinterpret_cast<int*>(encoded_offsets_address);
   int delta_to_map_check = -(encoded_offsets & 0xFFFF);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   int delta_to_record_write = encoded_offsets >> 16;
+#endif
 
   // Patch the map to check. The map address is the last 4 bytes of
   // the 7-byte operand-immediate compare instruction.
   Address map_check_address = test_instruction_address + delta_to_map_check;
   Address map_address = map_check_address + 3;
   *(reinterpret_cast<Object**>(map_address)) = map;
 
   // Patch the offset in the store instruction. The offset is in the
   // last 4 bytes of a six byte register-to-memory move instruction.
   Address offset_address =
       map_check_address + StoreIC::kOffsetToStoreInstruction + 2;
   // The offset should have initial value (kMaxInt - 1), cleared value
   // (-1) or we should be clearing the inlined version.
   ASSERT(*reinterpret_cast<int*>(offset_address) == kMaxInt - 1 ||
          *reinterpret_cast<int*>(offset_address) == -1 ||
          (offset == 0 && map == Heap::null_value()));
   *reinterpret_cast<int*>(offset_address) = offset - kHeapObjectTag;
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Patch the offset in the write-barrier code. The offset is the
   // last 4 bytes of a six byte lea instruction.
   offset_address = map_check_address + delta_to_record_write + 2;
   // The offset should have initial value (kMaxInt), cleared value
   // (-1) or we should be clearing the inlined version.
   ASSERT(*reinterpret_cast<int*>(offset_address) == kMaxInt ||
          *reinterpret_cast<int*>(offset_address) == -1 ||
          (offset == 0 && map == Heap::null_value()));
   *reinterpret_cast<int*>(offset_address) = offset - kHeapObjectTag;
+#endif
 
   return true;
 }
 
 
 static bool PatchInlinedMapCheck(Address address, Object* map) {
   if (V8::UseCrankshaft()) return false;
 
   Address test_instruction_address =
       address + Assembler::kCallTargetAddressOffset;
@@ skipping 303 matching lines @@
            GetStateName(state),
            Token::Name(op_));
   }
 #endif
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32