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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 #if V8_TARGET_ARCH_ARM64 | 5 #if V8_TARGET_ARCH_ARM64 |
| 6 | 6 |
| 7 #include "src/codegen.h" | 7 #include "src/codegen.h" |
| 8 #include "src/ic/ic.h" | 8 #include "src/ic/ic.h" |
| 9 #include "src/ic/ic-compiler.h" | 9 #include "src/ic/ic-compiler.h" |
| 10 #include "src/ic/stub-cache.h" | 10 #include "src/ic/stub-cache.h" |
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| 174 __ Ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); | 174 __ Ldr(elements, FieldMemOperand(receiver, JSObject::kElementsOffset)); |
| 175 __ AssertFastElements(elements); | 175 __ AssertFastElements(elements); |
| 176 | 176 |
| 177 // Check that the key (index) is within bounds. | 177 // Check that the key (index) is within bounds. |
| 178 __ Ldr(scratch1, FieldMemOperand(elements, FixedArray::kLengthOffset)); | 178 __ Ldr(scratch1, FieldMemOperand(elements, FixedArray::kLengthOffset)); |
| 179 __ Cmp(key, scratch1); | 179 __ Cmp(key, scratch1); |
| 180 __ B(lo, &in_bounds); | 180 __ B(lo, &in_bounds); |
| 181 | 181 |
| 182 // Out of bounds. Check the prototype chain to see if we can just return | 182 // Out of bounds. Check the prototype chain to see if we can just return |
| 183 // 'undefined'. | 183 // 'undefined'. |
| 184 __ Cmp(key, Operand(Smi::kZero)); | 184 __ Cmp(key, Operand(Smi::FromInt(0))); |
| 185 __ B(lt, slow); // Negative keys can't take the fast OOB path. | 185 __ B(lt, slow); // Negative keys can't take the fast OOB path. |
| 186 __ Bind(&check_prototypes); | 186 __ Bind(&check_prototypes); |
| 187 __ Ldr(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset)); | 187 __ Ldr(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset)); |
| 188 __ Bind(&check_next_prototype); | 188 __ Bind(&check_next_prototype); |
| 189 __ Ldr(scratch2, FieldMemOperand(scratch2, Map::kPrototypeOffset)); | 189 __ Ldr(scratch2, FieldMemOperand(scratch2, Map::kPrototypeOffset)); |
| 190 // scratch2: current prototype | 190 // scratch2: current prototype |
| 191 __ JumpIfRoot(scratch2, Heap::kNullValueRootIndex, &absent); | 191 __ JumpIfRoot(scratch2, Heap::kNullValueRootIndex, &absent); |
| 192 __ Ldr(elements, FieldMemOperand(scratch2, JSObject::kElementsOffset)); | 192 __ Ldr(elements, FieldMemOperand(scratch2, JSObject::kElementsOffset)); |
| 193 __ Ldr(scratch2, FieldMemOperand(scratch2, HeapObject::kMapOffset)); | 193 __ Ldr(scratch2, FieldMemOperand(scratch2, HeapObject::kMapOffset)); |
| 194 // elements: elements of current prototype | 194 // elements: elements of current prototype |
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| 844 } else { | 844 } else { |
| 845 DCHECK(to_patch->Mask(TestBranchMask) == TBNZ); | 845 DCHECK(to_patch->Mask(TestBranchMask) == TBNZ); |
| 846 // This is JumpIfSmi(smi_reg, branch_imm). | 846 // This is JumpIfSmi(smi_reg, branch_imm). |
| 847 patcher.tbz(smi_reg, 0, branch_imm); | 847 patcher.tbz(smi_reg, 0, branch_imm); |
| 848 } | 848 } |
| 849 } | 849 } |
| 850 } // namespace internal | 850 } // namespace internal |
| 851 } // namespace v8 | 851 } // namespace v8 |
| 852 | 852 |
| 853 #endif // V8_TARGET_ARCH_ARM64 | 853 #endif // V8_TARGET_ARCH_ARM64 |
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