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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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4382 | 4382 |
4383 // subject: Subject string | 4383 // subject: Subject string |
4384 // regexp_data: RegExp data (FixedArray) | 4384 // regexp_data: RegExp data (FixedArray) |
4385 // Check for flat cons string or sliced string. | 4385 // Check for flat cons string or sliced string. |
4386 // A flat cons string is a cons string where the second part is the empty | 4386 // A flat cons string is a cons string where the second part is the empty |
4387 // string. In that case the subject string is just the first part of the cons | 4387 // string. In that case the subject string is just the first part of the cons |
4388 // string. Also in this case the first part of the cons string is known to be | 4388 // string. Also in this case the first part of the cons string is known to be |
4389 // a sequential string or an external string. | 4389 // a sequential string or an external string. |
4390 // In the case of a sliced string its offset has to be taken into account. | 4390 // In the case of a sliced string its offset has to be taken into account. |
4391 Label cons_string, check_encoding; | 4391 Label cons_string, check_encoding; |
4392 STATIC_ASSERT((kConsStringTag < kExternalStringTag)); | 4392 STATIC_ASSERT(kConsStringTag < kExternalStringTag); |
4393 STATIC_ASSERT((kSlicedStringTag > kExternalStringTag)); | 4393 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag); |
4394 __ cmp(r1, Operand(kExternalStringTag)); | 4394 __ cmp(r1, Operand(kExternalStringTag)); |
4395 __ b(lt, &cons_string); | 4395 __ b(lt, &cons_string); |
4396 __ b(eq, &runtime); | 4396 __ b(eq, &runtime); |
4397 | 4397 |
4398 // String is sliced. | 4398 // String is sliced. |
4399 __ ldr(r9, FieldMemOperand(subject, SlicedString::kOffsetOffset)); | 4399 __ ldr(r9, FieldMemOperand(subject, SlicedString::kOffsetOffset)); |
4400 __ mov(r9, Operand(r9, ASR, kSmiTagSize)); | 4400 __ mov(r9, Operand(r9, ASR, kSmiTagSize)); |
4401 __ ldr(subject, FieldMemOperand(subject, SlicedString::kParentOffset)); | 4401 __ ldr(subject, FieldMemOperand(subject, SlicedString::kParentOffset)); |
4402 // r9: offset of sliced string, smi-tagged. | 4402 // r9: offset of sliced string, smi-tagged. |
4403 __ jmp(&check_encoding); | 4403 __ jmp(&check_encoding); |
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4850 __ cmp(ip, Operand(scratch_)); | 4850 __ cmp(ip, Operand(scratch_)); |
4851 __ b(ls, index_out_of_range_); | 4851 __ b(ls, index_out_of_range_); |
4852 | 4852 |
4853 // We need special handling for non-flat strings. | 4853 // We need special handling for non-flat strings. |
4854 STATIC_ASSERT(kSeqStringTag == 0); | 4854 STATIC_ASSERT(kSeqStringTag == 0); |
4855 __ tst(result_, Operand(kStringRepresentationMask)); | 4855 __ tst(result_, Operand(kStringRepresentationMask)); |
4856 __ b(eq, &flat_string); | 4856 __ b(eq, &flat_string); |
4857 | 4857 |
4858 // Handle non-flat strings. | 4858 // Handle non-flat strings. |
4859 __ and_(result_, result_, Operand(kStringRepresentationMask)); | 4859 __ and_(result_, result_, Operand(kStringRepresentationMask)); |
4860 STATIC_ASSERT((kConsStringTag < kExternalStringTag)); | 4860 STATIC_ASSERT(kConsStringTag < kExternalStringTag); |
4861 STATIC_ASSERT((kSlicedStringTag > kExternalStringTag)); | 4861 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag); |
4862 __ cmp(result_, Operand(kExternalStringTag)); | 4862 __ cmp(result_, Operand(kExternalStringTag)); |
4863 __ b(gt, &sliced_string); | 4863 __ b(gt, &sliced_string); |
4864 __ b(eq, &call_runtime_); | 4864 __ b(eq, &call_runtime_); |
4865 | 4865 |
4866 // ConsString. | 4866 // ConsString. |
4867 // Check whether the right hand side is the empty string (i.e. if | 4867 // Check whether the right hand side is the empty string (i.e. if |
4868 // this is really a flat string in a cons string). If that is not | 4868 // this is really a flat string in a cons string). If that is not |
4869 // the case we would rather go to the runtime system now to flatten | 4869 // the case we would rather go to the runtime system now to flatten |
4870 // the string. | 4870 // the string. |
4871 Label assure_seq_string; | 4871 Label assure_seq_string; |
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6610 __ mov(result, Operand::Zero()); | 6610 __ mov(result, Operand::Zero()); |
6611 __ Ret(); | 6611 __ Ret(); |
6612 } | 6612 } |
6613 | 6613 |
6614 | 6614 |
6615 #undef __ | 6615 #undef __ |
6616 | 6616 |
6617 } } // namespace v8::internal | 6617 } } // namespace v8::internal |
6618 | 6618 |
6619 #endif // V8_TARGET_ARCH_ARM | 6619 #endif // V8_TARGET_ARCH_ARM |
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