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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/arm64/codegen-arm64.h" | 5 #include "src/arm64/codegen-arm64.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_ARM64 | 7 #if V8_TARGET_ARCH_ARM64 |
8 | 8 |
9 #include "src/arm64/simulator-arm64.h" | 9 #include "src/arm64/simulator-arm64.h" |
10 #include "src/codegen.h" | 10 #include "src/codegen.h" |
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92 } | 92 } |
93 } | 93 } |
94 | 94 |
95 | 95 |
96 void StringCharLoadGenerator::Generate(MacroAssembler* masm, | 96 void StringCharLoadGenerator::Generate(MacroAssembler* masm, |
97 Register string, | 97 Register string, |
98 Register index, | 98 Register index, |
99 Register result, | 99 Register result, |
100 Label* call_runtime) { | 100 Label* call_runtime) { |
101 DCHECK(string.Is64Bits() && index.Is32Bits() && result.Is64Bits()); | 101 DCHECK(string.Is64Bits() && index.Is32Bits() && result.Is64Bits()); |
102 Label indirect_string_loaded; | |
103 __ Bind(&indirect_string_loaded); | |
104 | |
105 // Fetch the instance type of the receiver into result register. | 102 // Fetch the instance type of the receiver into result register. |
106 __ Ldr(result, FieldMemOperand(string, HeapObject::kMapOffset)); | 103 __ Ldr(result, FieldMemOperand(string, HeapObject::kMapOffset)); |
107 __ Ldrb(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); | 104 __ Ldrb(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); |
108 | 105 |
109 // We need special handling for indirect strings. | 106 // We need special handling for indirect strings. |
110 Label check_sequential; | 107 Label check_sequential; |
111 __ TestAndBranchIfAllClear(result, kIsIndirectStringMask, &check_sequential); | 108 __ TestAndBranchIfAllClear(result, kIsIndirectStringMask, &check_sequential); |
112 | 109 |
113 // Dispatch on the indirect string shape: slice or cons. | 110 // Dispatch on the indirect string shape: slice or cons. |
114 Label cons_string, thin_string; | 111 Label cons_string; |
115 __ And(result, result, kStringRepresentationMask); | 112 __ TestAndBranchIfAllClear(result, kSlicedNotConsMask, &cons_string); |
116 __ Cmp(result, kConsStringTag); | |
117 __ B(eq, &cons_string); | |
118 __ Cmp(result, kThinStringTag); | |
119 __ B(eq, &thin_string); | |
120 | 113 |
121 // Handle slices. | 114 // Handle slices. |
| 115 Label indirect_string_loaded; |
122 __ Ldr(result.W(), | 116 __ Ldr(result.W(), |
123 UntagSmiFieldMemOperand(string, SlicedString::kOffsetOffset)); | 117 UntagSmiFieldMemOperand(string, SlicedString::kOffsetOffset)); |
124 __ Ldr(string, FieldMemOperand(string, SlicedString::kParentOffset)); | 118 __ Ldr(string, FieldMemOperand(string, SlicedString::kParentOffset)); |
125 __ Add(index, index, result.W()); | 119 __ Add(index, index, result.W()); |
126 __ B(&indirect_string_loaded); | 120 __ B(&indirect_string_loaded); |
127 | 121 |
128 // Handle thin strings. | |
129 __ Bind(&thin_string); | |
130 __ Ldr(string, FieldMemOperand(string, ThinString::kActualOffset)); | |
131 __ B(&indirect_string_loaded); | |
132 | |
133 // Handle cons strings. | 122 // Handle cons strings. |
134 // Check whether the right hand side is the empty string (i.e. if | 123 // Check whether the right hand side is the empty string (i.e. if |
135 // this is really a flat string in a cons string). If that is not | 124 // this is really a flat string in a cons string). If that is not |
136 // the case we would rather go to the runtime system now to flatten | 125 // the case we would rather go to the runtime system now to flatten |
137 // the string. | 126 // the string. |
138 __ Bind(&cons_string); | 127 __ Bind(&cons_string); |
139 __ Ldr(result, FieldMemOperand(string, ConsString::kSecondOffset)); | 128 __ Ldr(result, FieldMemOperand(string, ConsString::kSecondOffset)); |
140 __ JumpIfNotRoot(result, Heap::kempty_stringRootIndex, call_runtime); | 129 __ JumpIfNotRoot(result, Heap::kempty_stringRootIndex, call_runtime); |
141 // Get the first of the two strings and load its instance type. | 130 // Get the first of the two strings and load its instance type. |
142 __ Ldr(string, FieldMemOperand(string, ConsString::kFirstOffset)); | 131 __ Ldr(string, FieldMemOperand(string, ConsString::kFirstOffset)); |
143 __ B(&indirect_string_loaded); | 132 |
| 133 __ Bind(&indirect_string_loaded); |
| 134 __ Ldr(result, FieldMemOperand(string, HeapObject::kMapOffset)); |
| 135 __ Ldrb(result, FieldMemOperand(result, Map::kInstanceTypeOffset)); |
144 | 136 |
145 // Distinguish sequential and external strings. Only these two string | 137 // Distinguish sequential and external strings. Only these two string |
146 // representations can reach here (slices and flat cons strings have been | 138 // representations can reach here (slices and flat cons strings have been |
147 // reduced to the underlying sequential or external string). | 139 // reduced to the underlying sequential or external string). |
148 Label external_string, check_encoding; | 140 Label external_string, check_encoding; |
149 __ Bind(&check_sequential); | 141 __ Bind(&check_sequential); |
150 STATIC_ASSERT(kSeqStringTag == 0); | 142 STATIC_ASSERT(kSeqStringTag == 0); |
151 __ TestAndBranchIfAnySet(result, kStringRepresentationMask, &external_string); | 143 __ TestAndBranchIfAnySet(result, kStringRepresentationMask, &external_string); |
152 | 144 |
153 // Prepare sequential strings | 145 // Prepare sequential strings |
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183 __ Ldrb(result, MemOperand(string, index, SXTW)); | 175 __ Ldrb(result, MemOperand(string, index, SXTW)); |
184 __ Bind(&done); | 176 __ Bind(&done); |
185 } | 177 } |
186 | 178 |
187 #undef __ | 179 #undef __ |
188 | 180 |
189 } // namespace internal | 181 } // namespace internal |
190 } // namespace v8 | 182 } // namespace v8 |
191 | 183 |
192 #endif // V8_TARGET_ARCH_ARM64 | 184 #endif // V8_TARGET_ARCH_ARM64 |
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