OLD | NEW |
1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/v8.h" | 5 #include "src/v8.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_X87 | 7 #if V8_TARGET_ARCH_X87 |
8 | 8 |
9 #include "src/codegen.h" | 9 #include "src/codegen.h" |
10 #include "src/heap/heap.h" | 10 #include "src/heap/heap.h" |
(...skipping 513 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
524 // Distinguish sequential and external strings. Only these two string | 524 // Distinguish sequential and external strings. Only these two string |
525 // representations can reach here (slices and flat cons strings have been | 525 // representations can reach here (slices and flat cons strings have been |
526 // reduced to the underlying sequential or external string). | 526 // reduced to the underlying sequential or external string). |
527 Label seq_string; | 527 Label seq_string; |
528 __ bind(&check_sequential); | 528 __ bind(&check_sequential); |
529 STATIC_ASSERT(kSeqStringTag == 0); | 529 STATIC_ASSERT(kSeqStringTag == 0); |
530 __ test(result, Immediate(kStringRepresentationMask)); | 530 __ test(result, Immediate(kStringRepresentationMask)); |
531 __ j(zero, &seq_string, Label::kNear); | 531 __ j(zero, &seq_string, Label::kNear); |
532 | 532 |
533 // Handle external strings. | 533 // Handle external strings. |
534 Label ascii_external, done; | 534 Label one_byte_external, done; |
535 if (FLAG_debug_code) { | 535 if (FLAG_debug_code) { |
536 // Assert that we do not have a cons or slice (indirect strings) here. | 536 // Assert that we do not have a cons or slice (indirect strings) here. |
537 // Sequential strings have already been ruled out. | 537 // Sequential strings have already been ruled out. |
538 __ test(result, Immediate(kIsIndirectStringMask)); | 538 __ test(result, Immediate(kIsIndirectStringMask)); |
539 __ Assert(zero, kExternalStringExpectedButNotFound); | 539 __ Assert(zero, kExternalStringExpectedButNotFound); |
540 } | 540 } |
541 // Rule out short external strings. | 541 // Rule out short external strings. |
542 STATIC_ASSERT(kShortExternalStringTag != 0); | 542 STATIC_ASSERT(kShortExternalStringTag != 0); |
543 __ test_b(result, kShortExternalStringMask); | 543 __ test_b(result, kShortExternalStringMask); |
544 __ j(not_zero, call_runtime); | 544 __ j(not_zero, call_runtime); |
545 // Check encoding. | 545 // Check encoding. |
546 STATIC_ASSERT(kTwoByteStringTag == 0); | 546 STATIC_ASSERT(kTwoByteStringTag == 0); |
547 __ test_b(result, kStringEncodingMask); | 547 __ test_b(result, kStringEncodingMask); |
548 __ mov(result, FieldOperand(string, ExternalString::kResourceDataOffset)); | 548 __ mov(result, FieldOperand(string, ExternalString::kResourceDataOffset)); |
549 __ j(not_equal, &ascii_external, Label::kNear); | 549 __ j(not_equal, &one_byte_external, Label::kNear); |
550 // Two-byte string. | 550 // Two-byte string. |
551 __ movzx_w(result, Operand(result, index, times_2, 0)); | 551 __ movzx_w(result, Operand(result, index, times_2, 0)); |
552 __ jmp(&done, Label::kNear); | 552 __ jmp(&done, Label::kNear); |
553 __ bind(&ascii_external); | 553 __ bind(&one_byte_external); |
554 // Ascii string. | 554 // One-byte string. |
555 __ movzx_b(result, Operand(result, index, times_1, 0)); | 555 __ movzx_b(result, Operand(result, index, times_1, 0)); |
556 __ jmp(&done, Label::kNear); | 556 __ jmp(&done, Label::kNear); |
557 | 557 |
558 // Dispatch on the encoding: ASCII or two-byte. | 558 // Dispatch on the encoding: one-byte or two-byte. |
559 Label ascii; | 559 Label one_byte; |
560 __ bind(&seq_string); | 560 __ bind(&seq_string); |
561 STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); | 561 STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); |
562 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); | 562 STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
563 __ test(result, Immediate(kStringEncodingMask)); | 563 __ test(result, Immediate(kStringEncodingMask)); |
564 __ j(not_zero, &ascii, Label::kNear); | 564 __ j(not_zero, &one_byte, Label::kNear); |
565 | 565 |
566 // Two-byte string. | 566 // Two-byte string. |
567 // Load the two-byte character code into the result register. | 567 // Load the two-byte character code into the result register. |
568 __ movzx_w(result, FieldOperand(string, | 568 __ movzx_w(result, FieldOperand(string, |
569 index, | 569 index, |
570 times_2, | 570 times_2, |
571 SeqTwoByteString::kHeaderSize)); | 571 SeqTwoByteString::kHeaderSize)); |
572 __ jmp(&done, Label::kNear); | 572 __ jmp(&done, Label::kNear); |
573 | 573 |
574 // Ascii string. | 574 // One-byte string. |
575 // Load the byte into the result register. | 575 // Load the byte into the result register. |
576 __ bind(&ascii); | 576 __ bind(&one_byte); |
577 __ movzx_b(result, FieldOperand(string, | 577 __ movzx_b(result, FieldOperand(string, |
578 index, | 578 index, |
579 times_1, | 579 times_1, |
580 SeqOneByteString::kHeaderSize)); | 580 SeqOneByteString::kHeaderSize)); |
581 __ bind(&done); | 581 __ bind(&done); |
582 } | 582 } |
583 | 583 |
584 | 584 |
585 #undef __ | 585 #undef __ |
586 | 586 |
(...skipping 49 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
636 Code* stub = GetCodeAgeStub(isolate, age, parity); | 636 Code* stub = GetCodeAgeStub(isolate, age, parity); |
637 CodePatcher patcher(sequence, young_length); | 637 CodePatcher patcher(sequence, young_length); |
638 patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32); | 638 patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32); |
639 } | 639 } |
640 } | 640 } |
641 | 641 |
642 | 642 |
643 } } // namespace v8::internal | 643 } } // namespace v8::internal |
644 | 644 |
645 #endif // V8_TARGET_ARCH_X87 | 645 #endif // V8_TARGET_ARCH_X87 |
OLD | NEW |