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Issue 950283002: Move Maps' back pointers from "transitions" to "constructor" field (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: fix stupidity on arm64 Created 5 years, 9 months ago
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1 // Copyright 2013 the V8 project authors. All rights reserved. 1 // Copyright 2013 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_ARM64 7 #if V8_TARGET_ARCH_ARM64
8 8
9 #include "src/base/bits.h" 9 #include "src/base/bits.h"
10 #include "src/base/division-by-constant.h" 10 #include "src/base/division-by-constant.h"
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3698 3698
3699 3699
3700 void MacroAssembler::LoadElementsKindFromMap(Register result, Register map) { 3700 void MacroAssembler::LoadElementsKindFromMap(Register result, Register map) {
3701 // Load the map's "bit field 2". 3701 // Load the map's "bit field 2".
3702 __ Ldrb(result, FieldMemOperand(map, Map::kBitField2Offset)); 3702 __ Ldrb(result, FieldMemOperand(map, Map::kBitField2Offset));
3703 // Retrieve elements_kind from bit field 2. 3703 // Retrieve elements_kind from bit field 2.
3704 DecodeField<Map::ElementsKindBits>(result); 3704 DecodeField<Map::ElementsKindBits>(result);
3705 } 3705 }
3706 3706
3707 3707
3708 void MacroAssembler::GetMapConstructor(Register result, Register map,
3709 Register temp, Register temp2) {
3710 Label done, loop;
3711 Ldr(result, FieldMemOperand(map, Map::kConstructorOrBackPointerOffset));
3712 Bind(&loop);
3713 JumpIfSmi(result, &done);
3714 CompareObjectType(result, temp, temp2, MAP_TYPE);
3715 B(ne, &done);
3716 Ldr(result, FieldMemOperand(result, Map::kConstructorOrBackPointerOffset));
3717 B(&loop);
3718 Bind(&done);
3719 }
3720
3721
3708 void MacroAssembler::TryGetFunctionPrototype(Register function, 3722 void MacroAssembler::TryGetFunctionPrototype(Register function,
3709 Register result, 3723 Register result,
3710 Register scratch, 3724 Register scratch,
3711 Label* miss, 3725 Label* miss,
3712 BoundFunctionAction action) { 3726 BoundFunctionAction action) {
3713 DCHECK(!AreAliased(function, result, scratch)); 3727 DCHECK(!AreAliased(function, result, scratch));
3714 3728
3715 Label non_instance; 3729 Label non_instance;
3716 if (action == kMissOnBoundFunction) { 3730 if (action == kMissOnBoundFunction) {
3717 // Check that the receiver isn't a smi. 3731 // Check that the receiver isn't a smi.
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3749 3763
3750 // Get the prototype from the initial map. 3764 // Get the prototype from the initial map.
3751 Ldr(result, FieldMemOperand(result, Map::kPrototypeOffset)); 3765 Ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
3752 3766
3753 if (action == kMissOnBoundFunction) { 3767 if (action == kMissOnBoundFunction) {
3754 B(&done); 3768 B(&done);
3755 3769
3756 // Non-instance prototype: fetch prototype from constructor field in initial 3770 // Non-instance prototype: fetch prototype from constructor field in initial
3757 // map. 3771 // map.
3758 Bind(&non_instance); 3772 Bind(&non_instance);
3759 Ldr(result, FieldMemOperand(result, Map::kConstructorOffset)); 3773 GetMapConstructor(result, result, scratch, scratch);
3760 } 3774 }
3761 3775
3762 // All done. 3776 // All done.
3763 Bind(&done); 3777 Bind(&done);
3764 } 3778 }
3765 3779
3766 3780
3767 void MacroAssembler::CompareRoot(const Register& obj, 3781 void MacroAssembler::CompareRoot(const Register& obj,
3768 Heap::RootListIndex index) { 3782 Heap::RootListIndex index) {
3769 UseScratchRegisterScope temps(this); 3783 UseScratchRegisterScope temps(this);
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5261 } 5275 }
5262 } 5276 }
5263 5277
5264 5278
5265 #undef __ 5279 #undef __
5266 5280
5267 5281
5268 } } // namespace v8::internal 5282 } } // namespace v8::internal
5269 5283
5270 #endif // V8_TARGET_ARCH_ARM64 5284 #endif // V8_TARGET_ARCH_ARM64
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