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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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832 | 832 |
833 void KeyedStoreIC::RestoreInlinedVersion(Address address) { | 833 void KeyedStoreIC::RestoreInlinedVersion(Address address) { |
834 // Restore the fast-case elements map check so that the inlined | 834 // Restore the fast-case elements map check so that the inlined |
835 // version can be used again. | 835 // version can be used again. |
836 PatchInlinedStore(address, Heap::fixed_array_map()); | 836 PatchInlinedStore(address, Heap::fixed_array_map()); |
837 } | 837 } |
838 | 838 |
839 | 839 |
840 bool LoadIC::PatchInlinedLoad(Address address, Object* map, int offset) { | 840 bool LoadIC::PatchInlinedLoad(Address address, Object* map, int offset) { |
841 // The address of the instruction following the call. | 841 // The address of the instruction following the call. |
842 Address test_instruction_address = address + 4; | 842 Address test_instruction_address = |
| 843 address + Assembler::kTargetAddrToReturnAddrDist; |
843 // If the instruction following the call is not a test eax, nothing | 844 // If the instruction following the call is not a test eax, nothing |
844 // was inlined. | 845 // was inlined. |
845 if (*test_instruction_address != kTestEaxByte) return false; | 846 if (*test_instruction_address != kTestEaxByte) return false; |
846 | 847 |
847 Address delta_address = test_instruction_address + 1; | 848 Address delta_address = test_instruction_address + 1; |
848 // The delta to the start of the map check instruction. | 849 // The delta to the start of the map check instruction. |
849 int delta = *reinterpret_cast<int*>(delta_address); | 850 int delta = *reinterpret_cast<int*>(delta_address); |
850 | 851 |
851 // The map address is the last 4 bytes of the 7-byte | 852 // The map address is the last 4 bytes of the 7-byte |
852 // operand-immediate compare instruction, so we add 3 to get the | 853 // operand-immediate compare instruction, so we add 3 to get the |
853 // offset to the last 4 bytes. | 854 // offset to the last 4 bytes. |
854 Address map_address = test_instruction_address + delta + 3; | 855 Address map_address = test_instruction_address + delta + 3; |
855 *(reinterpret_cast<Object**>(map_address)) = map; | 856 *(reinterpret_cast<Object**>(map_address)) = map; |
856 | 857 |
857 // The offset is in the last 4 bytes of a six byte | 858 // The offset is in the last 4 bytes of a six byte |
858 // memory-to-register move instruction, so we add 2 to get the | 859 // memory-to-register move instruction, so we add 2 to get the |
859 // offset to the last 4 bytes. | 860 // offset to the last 4 bytes. |
860 Address offset_address = | 861 Address offset_address = |
861 test_instruction_address + delta + kOffsetToLoadInstruction + 2; | 862 test_instruction_address + delta + kOffsetToLoadInstruction + 2; |
862 *reinterpret_cast<int*>(offset_address) = offset - kHeapObjectTag; | 863 *reinterpret_cast<int*>(offset_address) = offset - kHeapObjectTag; |
863 return true; | 864 return true; |
864 } | 865 } |
865 | 866 |
866 | 867 |
867 static bool PatchInlinedMapCheck(Address address, Object* map) { | 868 static bool PatchInlinedMapCheck(Address address, Object* map) { |
868 Address test_instruction_address = address + 4; // 4 = stub address | 869 Address test_instruction_address = |
| 870 address + Assembler::kTargetAddrToReturnAddrDist; |
869 // The keyed load has a fast inlined case if the IC call instruction | 871 // The keyed load has a fast inlined case if the IC call instruction |
870 // is immediately followed by a test instruction. | 872 // is immediately followed by a test instruction. |
871 if (*test_instruction_address != kTestEaxByte) return false; | 873 if (*test_instruction_address != kTestEaxByte) return false; |
872 | 874 |
873 // Fetch the offset from the test instruction to the map cmp | 875 // Fetch the offset from the test instruction to the map cmp |
874 // instruction. This offset is stored in the last 4 bytes of the 5 | 876 // instruction. This offset is stored in the last 4 bytes of the 5 |
875 // byte test instruction. | 877 // byte test instruction. |
876 Address delta_address = test_instruction_address + 1; | 878 Address delta_address = test_instruction_address + 1; |
877 int delta = *reinterpret_cast<int*>(delta_address); | 879 int delta = *reinterpret_cast<int*>(delta_address); |
878 // Compute the map address. The map address is in the last 4 bytes | 880 // Compute the map address. The map address is in the last 4 bytes |
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1030 | 1032 |
1031 // Do tail-call to runtime routine. | 1033 // Do tail-call to runtime routine. |
1032 __ TailCallRuntime( | 1034 __ TailCallRuntime( |
1033 ExternalReference(IC_Utility(kSharedStoreIC_ExtendStorage)), 3); | 1035 ExternalReference(IC_Utility(kSharedStoreIC_ExtendStorage)), 3); |
1034 } | 1036 } |
1035 | 1037 |
1036 #undef __ | 1038 #undef __ |
1037 | 1039 |
1038 | 1040 |
1039 } } // namespace v8::internal | 1041 } } // namespace v8::internal |
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