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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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| 401 // Distinguish sequential and external strings. Only these two string | 401 // Distinguish sequential and external strings. Only these two string |
| 402 // representations can reach here (slices and flat cons strings have been | 402 // representations can reach here (slices and flat cons strings have been |
| 403 // reduced to the underlying sequential or external string). | 403 // reduced to the underlying sequential or external string). |
| 404 Label external_string, check_encoding; | 404 Label external_string, check_encoding; |
| 405 __ bind(&check_sequential); | 405 __ bind(&check_sequential); |
| 406 STATIC_ASSERT(kSeqStringTag == 0); | 406 STATIC_ASSERT(kSeqStringTag == 0); |
| 407 __ And(at, result, Operand(kStringRepresentationMask)); | 407 __ And(at, result, Operand(kStringRepresentationMask)); |
| 408 __ Branch(&external_string, ne, at, Operand(zero_reg)); | 408 __ Branch(&external_string, ne, at, Operand(zero_reg)); |
| 409 | 409 |
| 410 // Prepare sequential strings | 410 // Prepare sequential strings |
| 411 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize); | 411 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize); |
| 412 __ Addu(string, | 412 __ Addu(string, |
| 413 string, | 413 string, |
| 414 SeqTwoByteString::kHeaderSize - kHeapObjectTag); | 414 SeqTwoByteString::kHeaderSize - kHeapObjectTag); |
| 415 __ jmp(&check_encoding); | 415 __ jmp(&check_encoding); |
| 416 | 416 |
| 417 // Handle external strings. | 417 // Handle external strings. |
| 418 __ bind(&external_string); | 418 __ bind(&external_string); |
| 419 if (FLAG_debug_code) { | 419 if (FLAG_debug_code) { |
| 420 // Assert that we do not have a cons or slice (indirect strings) here. | 420 // Assert that we do not have a cons or slice (indirect strings) here. |
| 421 // Sequential strings have already been ruled out. | 421 // Sequential strings have already been ruled out. |
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| 538 patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start())); | 538 patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start())); |
| 539 } | 539 } |
| 540 } | 540 } |
| 541 | 541 |
| 542 | 542 |
| 543 #undef __ | 543 #undef __ |
| 544 | 544 |
| 545 } } // namespace v8::internal | 545 } } // namespace v8::internal |
| 546 | 546 |
| 547 #endif // V8_TARGET_ARCH_MIPS | 547 #endif // V8_TARGET_ARCH_MIPS |
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