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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/x64/codegen-x64.h" | 5 #include "src/x64/codegen-x64.h" |
6 | 6 |
7 #if V8_TARGET_ARCH_X64 | 7 #if V8_TARGET_ARCH_X64 |
8 | 8 |
9 #include "src/codegen.h" | 9 #include "src/codegen.h" |
10 #include "src/macro-assembler.h" | 10 #include "src/macro-assembler.h" |
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60 // ------------------------------------------------------------------------- | 60 // ------------------------------------------------------------------------- |
61 // Code generators | 61 // Code generators |
62 | 62 |
63 #define __ ACCESS_MASM(masm) | 63 #define __ ACCESS_MASM(masm) |
64 | 64 |
65 void StringCharLoadGenerator::Generate(MacroAssembler* masm, | 65 void StringCharLoadGenerator::Generate(MacroAssembler* masm, |
66 Register string, | 66 Register string, |
67 Register index, | 67 Register index, |
68 Register result, | 68 Register result, |
69 Label* call_runtime) { | 69 Label* call_runtime) { |
70 Label indirect_string_loaded; | |
71 __ bind(&indirect_string_loaded); | |
72 | |
73 // Fetch the instance type of the receiver into result register. | 70 // Fetch the instance type of the receiver into result register. |
74 __ movp(result, FieldOperand(string, HeapObject::kMapOffset)); | 71 __ movp(result, FieldOperand(string, HeapObject::kMapOffset)); |
75 __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset)); | 72 __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
76 | 73 |
77 // We need special handling for indirect strings. | 74 // We need special handling for indirect strings. |
78 Label check_sequential; | 75 Label check_sequential; |
79 __ testb(result, Immediate(kIsIndirectStringMask)); | 76 __ testb(result, Immediate(kIsIndirectStringMask)); |
80 __ j(zero, &check_sequential, Label::kNear); | 77 __ j(zero, &check_sequential, Label::kNear); |
81 | 78 |
82 // Dispatch on the indirect string shape: slice or cons. | 79 // Dispatch on the indirect string shape: slice or cons. |
83 Label cons_string, thin_string; | 80 Label cons_string; |
84 __ andl(result, Immediate(kStringRepresentationMask)); | 81 __ testb(result, Immediate(kSlicedNotConsMask)); |
85 __ cmpl(result, Immediate(kConsStringTag)); | 82 __ j(zero, &cons_string, Label::kNear); |
86 __ j(equal, &cons_string, Label::kNear); | |
87 __ cmpl(result, Immediate(kThinStringTag)); | |
88 __ j(equal, &thin_string, Label::kNear); | |
89 | 83 |
90 // Handle slices. | 84 // Handle slices. |
| 85 Label indirect_string_loaded; |
91 __ SmiToInteger32(result, FieldOperand(string, SlicedString::kOffsetOffset)); | 86 __ SmiToInteger32(result, FieldOperand(string, SlicedString::kOffsetOffset)); |
92 __ addp(index, result); | 87 __ addp(index, result); |
93 __ movp(string, FieldOperand(string, SlicedString::kParentOffset)); | 88 __ movp(string, FieldOperand(string, SlicedString::kParentOffset)); |
94 __ jmp(&indirect_string_loaded); | 89 __ jmp(&indirect_string_loaded, Label::kNear); |
95 | |
96 // Handle thin strings. | |
97 __ bind(&thin_string); | |
98 __ movp(string, FieldOperand(string, ThinString::kActualOffset)); | |
99 __ jmp(&indirect_string_loaded); | |
100 | 90 |
101 // Handle cons strings. | 91 // Handle cons strings. |
102 // Check whether the right hand side is the empty string (i.e. if | 92 // Check whether the right hand side is the empty string (i.e. if |
103 // this is really a flat string in a cons string). If that is not | 93 // this is really a flat string in a cons string). If that is not |
104 // the case we would rather go to the runtime system now to flatten | 94 // the case we would rather go to the runtime system now to flatten |
105 // the string. | 95 // the string. |
106 __ bind(&cons_string); | 96 __ bind(&cons_string); |
107 __ CompareRoot(FieldOperand(string, ConsString::kSecondOffset), | 97 __ CompareRoot(FieldOperand(string, ConsString::kSecondOffset), |
108 Heap::kempty_stringRootIndex); | 98 Heap::kempty_stringRootIndex); |
109 __ j(not_equal, call_runtime); | 99 __ j(not_equal, call_runtime); |
110 __ movp(string, FieldOperand(string, ConsString::kFirstOffset)); | 100 __ movp(string, FieldOperand(string, ConsString::kFirstOffset)); |
111 __ jmp(&indirect_string_loaded); | 101 |
| 102 __ bind(&indirect_string_loaded); |
| 103 __ movp(result, FieldOperand(string, HeapObject::kMapOffset)); |
| 104 __ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
112 | 105 |
113 // Distinguish sequential and external strings. Only these two string | 106 // Distinguish sequential and external strings. Only these two string |
114 // representations can reach here (slices and flat cons strings have been | 107 // representations can reach here (slices and flat cons strings have been |
115 // reduced to the underlying sequential or external string). | 108 // reduced to the underlying sequential or external string). |
116 Label seq_string; | 109 Label seq_string; |
117 __ bind(&check_sequential); | 110 __ bind(&check_sequential); |
118 STATIC_ASSERT(kSeqStringTag == 0); | 111 STATIC_ASSERT(kSeqStringTag == 0); |
119 __ testb(result, Immediate(kStringRepresentationMask)); | 112 __ testb(result, Immediate(kStringRepresentationMask)); |
120 __ j(zero, &seq_string, Label::kNear); | 113 __ j(zero, &seq_string, Label::kNear); |
121 | 114 |
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246 return Operand(base_reg_, argument_count_reg_, times_pointer_size, | 239 return Operand(base_reg_, argument_count_reg_, times_pointer_size, |
247 displacement_to_last_argument + (receiver - 1 - index) * kPointerSize); | 240 displacement_to_last_argument + (receiver - 1 - index) * kPointerSize); |
248 } | 241 } |
249 } | 242 } |
250 | 243 |
251 | 244 |
252 } // namespace internal | 245 } // namespace internal |
253 } // namespace v8 | 246 } // namespace v8 |
254 | 247 |
255 #endif // V8_TARGET_ARCH_X64 | 248 #endif // V8_TARGET_ARCH_X64 |
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