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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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4534 // subject: Subject string | 4534 // subject: Subject string |
4535 // a0: instance type if Subject string | 4535 // a0: instance type if Subject string |
4536 // regexp_data: RegExp data (FixedArray) | 4536 // regexp_data: RegExp data (FixedArray) |
4537 // Check for flat cons string or sliced string. | 4537 // Check for flat cons string or sliced string. |
4538 // A flat cons string is a cons string where the second part is the empty | 4538 // A flat cons string is a cons string where the second part is the empty |
4539 // string. In that case the subject string is just the first part of the cons | 4539 // string. In that case the subject string is just the first part of the cons |
4540 // string. Also in this case the first part of the cons string is known to be | 4540 // string. Also in this case the first part of the cons string is known to be |
4541 // a sequential string or an external string. | 4541 // a sequential string or an external string. |
4542 // In the case of a sliced string its offset has to be taken into account. | 4542 // In the case of a sliced string its offset has to be taken into account. |
4543 Label cons_string, check_encoding; | 4543 Label cons_string, check_encoding; |
4544 STATIC_ASSERT((kConsStringTag < kExternalStringTag)); | 4544 STATIC_ASSERT(kConsStringTag < kExternalStringTag); |
4545 STATIC_ASSERT((kSlicedStringTag > kExternalStringTag)); | 4545 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag); |
4546 __ Branch(&cons_string, lt, at, Operand(kExternalStringTag)); | 4546 __ Branch(&cons_string, lt, at, Operand(kExternalStringTag)); |
4547 __ Branch(&runtime, eq, at, Operand(kExternalStringTag)); | 4547 __ Branch(&runtime, eq, at, Operand(kExternalStringTag)); |
4548 | 4548 |
4549 // String is sliced. | 4549 // String is sliced. |
4550 __ lw(t0, FieldMemOperand(subject, SlicedString::kOffsetOffset)); | 4550 __ lw(t0, FieldMemOperand(subject, SlicedString::kOffsetOffset)); |
4551 __ sra(t0, t0, kSmiTagSize); | 4551 __ sra(t0, t0, kSmiTagSize); |
4552 __ lw(subject, FieldMemOperand(subject, SlicedString::kParentOffset)); | 4552 __ lw(subject, FieldMemOperand(subject, SlicedString::kParentOffset)); |
4553 // t5: offset of sliced string, smi-tagged. | 4553 // t5: offset of sliced string, smi-tagged. |
4554 __ jmp(&check_encoding); | 4554 __ jmp(&check_encoding); |
4555 // String is a cons string, check whether it is flat. | 4555 // String is a cons string, check whether it is flat. |
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5018 __ lw(t0, FieldMemOperand(object_, String::kLengthOffset)); | 5018 __ lw(t0, FieldMemOperand(object_, String::kLengthOffset)); |
5019 __ Branch(index_out_of_range_, ls, t0, Operand(scratch_)); | 5019 __ Branch(index_out_of_range_, ls, t0, Operand(scratch_)); |
5020 | 5020 |
5021 // We need special handling for non-flat strings. | 5021 // We need special handling for non-flat strings. |
5022 STATIC_ASSERT(kSeqStringTag == 0); | 5022 STATIC_ASSERT(kSeqStringTag == 0); |
5023 __ And(t0, result_, Operand(kStringRepresentationMask)); | 5023 __ And(t0, result_, Operand(kStringRepresentationMask)); |
5024 __ Branch(&flat_string, eq, t0, Operand(zero_reg)); | 5024 __ Branch(&flat_string, eq, t0, Operand(zero_reg)); |
5025 | 5025 |
5026 // Handle non-flat strings. | 5026 // Handle non-flat strings. |
5027 __ And(result_, result_, Operand(kStringRepresentationMask)); | 5027 __ And(result_, result_, Operand(kStringRepresentationMask)); |
5028 STATIC_ASSERT((kConsStringTag < kExternalStringTag)); | 5028 STATIC_ASSERT(kConsStringTag < kExternalStringTag); |
5029 STATIC_ASSERT((kSlicedStringTag > kExternalStringTag)); | 5029 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag); |
5030 __ Branch(&sliced_string, gt, result_, Operand(kExternalStringTag)); | 5030 __ Branch(&sliced_string, gt, result_, Operand(kExternalStringTag)); |
5031 __ Branch(&call_runtime_, eq, result_, Operand(kExternalStringTag)); | 5031 __ Branch(&call_runtime_, eq, result_, Operand(kExternalStringTag)); |
5032 | 5032 |
5033 // ConsString. | 5033 // ConsString. |
5034 // Check whether the right hand side is the empty string (i.e. if | 5034 // Check whether the right hand side is the empty string (i.e. if |
5035 // this is really a flat string in a cons string). If that is not | 5035 // this is really a flat string in a cons string). If that is not |
5036 // the case we would rather go to the runtime system now to flatten | 5036 // the case we would rather go to the runtime system now to flatten |
5037 // the string. | 5037 // the string. |
5038 Label assure_seq_string; | 5038 Label assure_seq_string; |
5039 __ lw(result_, FieldMemOperand(object_, ConsString::kSecondOffset)); | 5039 __ lw(result_, FieldMemOperand(object_, ConsString::kSecondOffset)); |
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6868 __ mov(result, zero_reg); | 6868 __ mov(result, zero_reg); |
6869 __ Ret(); | 6869 __ Ret(); |
6870 } | 6870 } |
6871 | 6871 |
6872 | 6872 |
6873 #undef __ | 6873 #undef __ |
6874 | 6874 |
6875 } } // namespace v8::internal | 6875 } } // namespace v8::internal |
6876 | 6876 |
6877 #endif // V8_TARGET_ARCH_MIPS | 6877 #endif // V8_TARGET_ARCH_MIPS |
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