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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 // 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/mips/codegen-mips.h" | 5 #include "src/mips/codegen-mips.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_MIPS | 7 #if V8_TARGET_ARCH_MIPS |
8 | 8 |
9 #include <memory> | 9 #include <memory> |
10 | 10 |
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613 // Fetch the instance type of the receiver into result register. | 613 // Fetch the instance type of the receiver into result register. |
614 __ lw(result, FieldMemOperand(string, HeapObject::kMapOffset)); | 614 __ lw(result, FieldMemOperand(string, HeapObject::kMapOffset)); |
615 __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); | 615 __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); |
616 | 616 |
617 // We need special handling for indirect strings. | 617 // We need special handling for indirect strings. |
618 Label check_sequential; | 618 Label check_sequential; |
619 __ And(at, result, Operand(kIsIndirectStringMask)); | 619 __ And(at, result, Operand(kIsIndirectStringMask)); |
620 __ Branch(&check_sequential, eq, at, Operand(zero_reg)); | 620 __ Branch(&check_sequential, eq, at, Operand(zero_reg)); |
621 | 621 |
622 // Dispatch on the indirect string shape: slice or cons. | 622 // Dispatch on the indirect string shape: slice or cons. |
623 Label cons_string, thin_string; | 623 Label cons_string; |
624 __ And(at, result, Operand(kStringRepresentationMask)); | 624 __ And(at, result, Operand(kSlicedNotConsMask)); |
625 __ Branch(&cons_string, eq, at, Operand(kConsStringTag)); | 625 __ Branch(&cons_string, eq, at, Operand(zero_reg)); |
626 __ Branch(&thin_string, eq, at, Operand(kThinStringTag)); | |
627 | 626 |
628 // Handle slices. | 627 // Handle slices. |
629 Label indirect_string_loaded; | 628 Label indirect_string_loaded; |
630 __ lw(result, FieldMemOperand(string, SlicedString::kOffsetOffset)); | 629 __ lw(result, FieldMemOperand(string, SlicedString::kOffsetOffset)); |
631 __ lw(string, FieldMemOperand(string, SlicedString::kParentOffset)); | 630 __ lw(string, FieldMemOperand(string, SlicedString::kParentOffset)); |
632 __ sra(at, result, kSmiTagSize); | 631 __ sra(at, result, kSmiTagSize); |
633 __ Addu(index, index, at); | 632 __ Addu(index, index, at); |
634 __ jmp(&indirect_string_loaded); | 633 __ jmp(&indirect_string_loaded); |
635 | 634 |
636 // Handle thin strings. | |
637 __ bind(&thin_string); | |
638 __ lw(string, FieldMemOperand(string, ThinString::kActualOffset)); | |
639 __ jmp(&indirect_string_loaded); | |
640 | |
641 // Handle cons strings. | 635 // Handle cons strings. |
642 // Check whether the right hand side is the empty string (i.e. if | 636 // Check whether the right hand side is the empty string (i.e. if |
643 // this is really a flat string in a cons string). If that is not | 637 // this is really a flat string in a cons string). If that is not |
644 // the case we would rather go to the runtime system now to flatten | 638 // the case we would rather go to the runtime system now to flatten |
645 // the string. | 639 // the string. |
646 __ bind(&cons_string); | 640 __ bind(&cons_string); |
647 __ lw(result, FieldMemOperand(string, ConsString::kSecondOffset)); | 641 __ lw(result, FieldMemOperand(string, ConsString::kSecondOffset)); |
648 __ LoadRoot(at, Heap::kempty_stringRootIndex); | 642 __ LoadRoot(at, Heap::kempty_stringRootIndex); |
649 __ Branch(call_runtime, ne, result, Operand(at)); | 643 __ Branch(call_runtime, ne, result, Operand(at)); |
650 // Get the first of the two strings and load its instance type. | 644 // Get the first of the two strings and load its instance type. |
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771 } | 765 } |
772 } | 766 } |
773 | 767 |
774 | 768 |
775 #undef __ | 769 #undef __ |
776 | 770 |
777 } // namespace internal | 771 } // namespace internal |
778 } // namespace v8 | 772 } // namespace v8 |
779 | 773 |
780 #endif // V8_TARGET_ARCH_MIPS | 774 #endif // V8_TARGET_ARCH_MIPS |
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