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Issue 12296026: ES6 symbols: Implement Symbol intrinsic and basic functionality (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Addressed more comments Created 7 years, 9 months ago
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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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5889 STATIC_ASSERT(kSmiTag == 0); 5889 STATIC_ASSERT(kSmiTag == 0);
5890 __ Move(rax, Smi::FromInt(EQUAL)); 5890 __ Move(rax, Smi::FromInt(EQUAL));
5891 __ bind(&done); 5891 __ bind(&done);
5892 __ ret(0); 5892 __ ret(0);
5893 5893
5894 __ bind(&miss); 5894 __ bind(&miss);
5895 GenerateMiss(masm); 5895 GenerateMiss(masm);
5896 } 5896 }
5897 5897
5898 5898
5899 void ICCompareStub::GenerateUniqueNames(MacroAssembler* masm) {
5900 ASSERT(state_ == CompareIC::UNIQUE_NAME);
5901 ASSERT(GetCondition() == equal);
5902
5903 // Registers containing left and right operands respectively.
5904 Register left = rdx;
5905 Register right = rax;
5906 Register tmp1 = rcx;
5907 Register tmp2 = rbx;
5908
5909 // Check that both operands are heap objects.
5910 Label miss;
5911 Condition cond = masm->CheckEitherSmi(left, right, tmp1);
5912 __ j(cond, &miss, Label::kNear);
5913
5914 // Check that both operands are unique names. This leaves the instance
5915 // types loaded in tmp1 and tmp2.
5916 STATIC_ASSERT(kInternalizedTag != 0);
5917 __ movq(tmp1, FieldOperand(left, HeapObject::kMapOffset));
5918 __ movq(tmp2, FieldOperand(right, HeapObject::kMapOffset));
5919 __ movzxbq(tmp1, FieldOperand(tmp1, Map::kInstanceTypeOffset));
5920 __ movzxbq(tmp2, FieldOperand(tmp2, Map::kInstanceTypeOffset));
5921
5922 Label succeed1;
5923 __ testb(tmp1, Immediate(kIsInternalizedMask));
5924 __ j(not_zero, &succeed1, Label::kNear);
5925 __ cmpb(tmp1, Immediate(static_cast<int8_t>(SYMBOL_TYPE)));
5926 __ j(not_equal, &miss, Label::kNear);
5927 __ bind(&succeed1);
5928
5929 Label succeed2;
5930 __ testb(tmp2, Immediate(kIsInternalizedMask));
5931 __ j(not_zero, &succeed2, Label::kNear);
5932 __ cmpb(tmp2, Immediate(static_cast<int8_t>(SYMBOL_TYPE)));
5933 __ j(not_equal, &miss, Label::kNear);
5934 __ bind(&succeed2);
5935
5936 // Unique names are compared by identity.
5937 Label done;
5938 __ cmpq(left, right);
5939 // Make sure rax is non-zero. At this point input operands are
5940 // guaranteed to be non-zero.
5941 ASSERT(right.is(rax));
5942 __ j(not_equal, &done, Label::kNear);
5943 STATIC_ASSERT(EQUAL == 0);
5944 STATIC_ASSERT(kSmiTag == 0);
5945 __ Move(rax, Smi::FromInt(EQUAL));
5946 __ bind(&done);
5947 __ ret(0);
5948
5949 __ bind(&miss);
5950 GenerateMiss(masm);
5951 }
5952
5953
5899 void ICCompareStub::GenerateStrings(MacroAssembler* masm) { 5954 void ICCompareStub::GenerateStrings(MacroAssembler* masm) {
5900 ASSERT(state_ == CompareIC::STRING); 5955 ASSERT(state_ == CompareIC::STRING);
5901 Label miss; 5956 Label miss;
5902 5957
5903 bool equality = Token::IsEqualityOp(op_); 5958 bool equality = Token::IsEqualityOp(op_);
5904 5959
5905 // Registers containing left and right operands respectively. 5960 // Registers containing left and right operands respectively.
5906 Register left = rdx; 5961 Register left = rdx;
5907 Register right = rax; 5962 Register right = rax;
5908 Register tmp1 = rcx; 5963 Register tmp1 = rcx;
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6714 #endif 6769 #endif
6715 6770
6716 __ Ret(); 6771 __ Ret();
6717 } 6772 }
6718 6773
6719 #undef __ 6774 #undef __
6720 6775
6721 } } // namespace v8::internal 6776 } } // namespace v8::internal
6722 6777
6723 #endif // V8_TARGET_ARCH_X64 6778 #endif // V8_TARGET_ARCH_X64
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