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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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1708 return less_equal; | 1708 return less_equal; |
1709 case Token::GTE: | 1709 case Token::GTE: |
1710 return greater_equal; | 1710 return greater_equal; |
1711 default: | 1711 default: |
1712 UNREACHABLE(); | 1712 UNREACHABLE(); |
1713 return no_condition; | 1713 return no_condition; |
1714 } | 1714 } |
1715 } | 1715 } |
1716 | 1716 |
1717 | 1717 |
1718 static bool HasInlinedSmiCode(Address address) { | 1718 bool CompareIC::HasInlinedSmiCode(Address address) { |
1719 // The address of the instruction following the call. | 1719 // The address of the instruction following the call. |
1720 Address test_instruction_address = | 1720 Address test_instruction_address = |
1721 address + Assembler::kCallTargetAddressOffset; | 1721 address + Assembler::kCallTargetAddressOffset; |
1722 | 1722 |
1723 // If the instruction following the call is not a test al, nothing | 1723 // If the instruction following the call is not a test al, nothing |
1724 // was inlined. | 1724 // was inlined. |
1725 return *test_instruction_address == Assembler::kTestAlByte; | 1725 return *test_instruction_address == Assembler::kTestAlByte; |
1726 } | 1726 } |
1727 | 1727 |
1728 | 1728 |
1729 void CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) { | |
1730 HandleScope scope; | |
1731 Handle<Code> rewritten; | |
1732 State previous_state = GetState(); | |
1733 | |
1734 State state = TargetState(previous_state, HasInlinedSmiCode(address()), x, y); | |
1735 if (state == GENERIC) { | |
1736 CompareStub stub(GetCondition(), strict(), NO_COMPARE_FLAGS); | |
1737 rewritten = stub.GetCode(); | |
1738 } else { | |
1739 ICCompareStub stub(op_, state); | |
1740 if (state == KNOWN_OBJECTS) { | |
1741 stub.set_known_map(Handle<Map>(Handle<JSObject>::cast(x)->map())); | |
1742 } | |
1743 rewritten = stub.GetCode(); | |
1744 } | |
1745 set_target(*rewritten); | |
1746 | |
1747 #ifdef DEBUG | |
1748 if (FLAG_trace_ic) { | |
1749 PrintF("[CompareIC (%s->%s)#%s]\n", | |
1750 GetStateName(previous_state), | |
1751 GetStateName(state), | |
1752 Token::Name(op_)); | |
1753 } | |
1754 #endif | |
1755 | |
1756 // Activate inlined smi code. | |
1757 if (previous_state == UNINITIALIZED) { | |
1758 PatchInlinedSmiCode(address(), ENABLE_INLINED_SMI_CHECK); | |
1759 } | |
1760 } | |
1761 | |
1762 | |
1763 void PatchInlinedSmiCode(Address address, InlinedSmiCheck check) { | 1729 void PatchInlinedSmiCode(Address address, InlinedSmiCheck check) { |
1764 // The address of the instruction following the call. | 1730 // The address of the instruction following the call. |
1765 Address test_instruction_address = | 1731 Address test_instruction_address = |
1766 address + Assembler::kCallTargetAddressOffset; | 1732 address + Assembler::kCallTargetAddressOffset; |
1767 | 1733 |
1768 // If the instruction following the call is not a test al, nothing | 1734 // If the instruction following the call is not a test al, nothing |
1769 // was inlined. | 1735 // was inlined. |
1770 if (*test_instruction_address != Assembler::kTestAlByte) { | 1736 if (*test_instruction_address != Assembler::kTestAlByte) { |
1771 ASSERT(*test_instruction_address == Assembler::kNopByte); | 1737 ASSERT(*test_instruction_address == Assembler::kNopByte); |
1772 return; | 1738 return; |
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1793 Condition cc = (check == ENABLE_INLINED_SMI_CHECK) | 1759 Condition cc = (check == ENABLE_INLINED_SMI_CHECK) |
1794 ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero) | 1760 ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero) |
1795 : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry); | 1761 : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry); |
1796 *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc); | 1762 *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc); |
1797 } | 1763 } |
1798 | 1764 |
1799 | 1765 |
1800 } } // namespace v8::internal | 1766 } } // namespace v8::internal |
1801 | 1767 |
1802 #endif // V8_TARGET_ARCH_IA32 | 1768 #endif // V8_TARGET_ARCH_IA32 |
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