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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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409 // Distinguish sequential and external strings. Only these two string | 409 // Distinguish sequential and external strings. Only these two string |
410 // representations can reach here (slices and flat cons strings have been | 410 // representations can reach here (slices and flat cons strings have been |
411 // reduced to the underlying sequential or external string). | 411 // reduced to the underlying sequential or external string). |
412 Label external_string, check_encoding; | 412 Label external_string, check_encoding; |
413 __ bind(&check_sequential); | 413 __ bind(&check_sequential); |
414 STATIC_ASSERT(kSeqStringTag == 0); | 414 STATIC_ASSERT(kSeqStringTag == 0); |
415 __ tst(result, Operand(kStringRepresentationMask)); | 415 __ tst(result, Operand(kStringRepresentationMask)); |
416 __ b(ne, &external_string); | 416 __ b(ne, &external_string); |
417 | 417 |
418 // Prepare sequential strings | 418 // Prepare sequential strings |
419 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize); | 419 STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize); |
420 __ add(string, | 420 __ add(string, |
421 string, | 421 string, |
422 Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); | 422 Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); |
423 __ jmp(&check_encoding); | 423 __ jmp(&check_encoding); |
424 | 424 |
425 // Handle external strings. | 425 // Handle external strings. |
426 __ bind(&external_string); | 426 __ bind(&external_string); |
427 if (FLAG_debug_code) { | 427 if (FLAG_debug_code) { |
428 // Assert that we do not have a cons or slice (indirect strings) here. | 428 // Assert that we do not have a cons or slice (indirect strings) here. |
429 // Sequential strings have already been ruled out. | 429 // Sequential strings have already been ruled out. |
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534 patcher.masm()->add(r0, pc, Operand(-8)); | 534 patcher.masm()->add(r0, pc, Operand(-8)); |
535 patcher.masm()->ldr(pc, MemOperand(pc, -4)); | 535 patcher.masm()->ldr(pc, MemOperand(pc, -4)); |
536 patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start())); | 536 patcher.masm()->dd(reinterpret_cast<uint32_t>(stub->instruction_start())); |
537 } | 537 } |
538 } | 538 } |
539 | 539 |
540 | 540 |
541 } } // namespace v8::internal | 541 } } // namespace v8::internal |
542 | 542 |
543 #endif // V8_TARGET_ARCH_ARM | 543 #endif // V8_TARGET_ARCH_ARM |
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