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Issue 2621913002: Revert of Internalize strings in-place (Closed)
Patch Set: Created 3 years, 11 months ago
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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/mips64/codegen-mips64.h" 5 #include "src/mips64/codegen-mips64.h"
6 6
7 #if V8_TARGET_ARCH_MIPS64 7 #if V8_TARGET_ARCH_MIPS64
8 8
9 #include <memory> 9 #include <memory>
10 10
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615 // Fetch the instance type of the receiver into result register. 615 // Fetch the instance type of the receiver into result register.
616 __ ld(result, FieldMemOperand(string, HeapObject::kMapOffset)); 616 __ ld(result, FieldMemOperand(string, HeapObject::kMapOffset));
617 __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); 617 __ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset));
618 618
619 // We need special handling for indirect strings. 619 // We need special handling for indirect strings.
620 Label check_sequential; 620 Label check_sequential;
621 __ And(at, result, Operand(kIsIndirectStringMask)); 621 __ And(at, result, Operand(kIsIndirectStringMask));
622 __ Branch(&check_sequential, eq, at, Operand(zero_reg)); 622 __ Branch(&check_sequential, eq, at, Operand(zero_reg));
623 623
624 // Dispatch on the indirect string shape: slice or cons. 624 // Dispatch on the indirect string shape: slice or cons.
625 Label cons_string, thin_string; 625 Label cons_string;
626 __ And(at, result, Operand(kStringRepresentationMask)); 626 __ And(at, result, Operand(kSlicedNotConsMask));
627 __ Branch(&cons_string, eq, at, Operand(kConsStringTag)); 627 __ Branch(&cons_string, eq, at, Operand(zero_reg));
628 __ Branch(&thin_string, eq, at, Operand(kThinStringTag));
629 628
630 // Handle slices. 629 // Handle slices.
631 Label indirect_string_loaded; 630 Label indirect_string_loaded;
632 __ ld(result, FieldMemOperand(string, SlicedString::kOffsetOffset)); 631 __ ld(result, FieldMemOperand(string, SlicedString::kOffsetOffset));
633 __ ld(string, FieldMemOperand(string, SlicedString::kParentOffset)); 632 __ ld(string, FieldMemOperand(string, SlicedString::kParentOffset));
634 __ dsra32(at, result, 0); 633 __ dsra32(at, result, 0);
635 __ Daddu(index, index, at); 634 __ Daddu(index, index, at);
636 __ jmp(&indirect_string_loaded); 635 __ jmp(&indirect_string_loaded);
637 636
638 // Handle thin strings.
639 __ bind(&thin_string);
640 __ ld(string, FieldMemOperand(string, ThinString::kActualOffset));
641 __ jmp(&indirect_string_loaded);
642
643 // Handle cons strings. 637 // Handle cons strings.
644 // Check whether the right hand side is the empty string (i.e. if 638 // Check whether the right hand side is the empty string (i.e. if
645 // this is really a flat string in a cons string). If that is not 639 // this is really a flat string in a cons string). If that is not
646 // the case we would rather go to the runtime system now to flatten 640 // the case we would rather go to the runtime system now to flatten
647 // the string. 641 // the string.
648 __ bind(&cons_string); 642 __ bind(&cons_string);
649 __ ld(result, FieldMemOperand(string, ConsString::kSecondOffset)); 643 __ ld(result, FieldMemOperand(string, ConsString::kSecondOffset));
650 __ LoadRoot(at, Heap::kempty_stringRootIndex); 644 __ LoadRoot(at, Heap::kempty_stringRootIndex);
651 __ Branch(call_runtime, ne, result, Operand(at)); 645 __ Branch(call_runtime, ne, result, Operand(at));
652 // Get the first of the two strings and load its instance type. 646 // Get the first of the two strings and load its instance type.
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775 } 769 }
776 } 770 }
777 771
778 772
779 #undef __ 773 #undef __
780 774
781 } // namespace internal 775 } // namespace internal
782 } // namespace v8 776 } // namespace v8
783 777
784 #endif // V8_TARGET_ARCH_MIPS64 778 #endif // V8_TARGET_ARCH_MIPS64
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