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1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 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 #ifndef V8_COMPILER_MACHINE_TYPE_H_ | 5 #ifndef V8_COMPILER_MACHINE_TYPE_H_ |
6 #define V8_COMPILER_MACHINE_TYPE_H_ | 6 #define V8_COMPILER_MACHINE_TYPE_H_ |
7 | 7 |
8 #include "src/base/bits.h" | 8 #include "src/base/bits.h" |
9 #include "src/globals.h" | 9 #include "src/globals.h" |
| 10 #include "src/zone.h" |
10 | 11 |
11 namespace v8 { | 12 namespace v8 { |
12 namespace internal { | 13 namespace internal { |
13 | 14 |
14 class OStream; | 15 class OStream; |
15 | 16 |
16 namespace compiler { | 17 namespace compiler { |
17 | 18 |
18 // Machine-level types and representations. | 19 // Machine-level types and representations. |
19 // TODO(titzer): Use the real type system instead of MachineType. | 20 // TODO(titzer): Use the real type system instead of MachineType. |
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102 case kRepFloat64: | 103 case kRepFloat64: |
103 return 8; | 104 return 8; |
104 case kRepTagged: | 105 case kRepTagged: |
105 return kPointerSize; | 106 return kPointerSize; |
106 default: | 107 default: |
107 UNREACHABLE(); | 108 UNREACHABLE(); |
108 return kPointerSize; | 109 return kPointerSize; |
109 } | 110 } |
110 } | 111 } |
111 | 112 |
112 // Describes the inputs and outputs of a function or call in terms of machine | 113 // Describes the inputs and outputs of a function or call. |
113 // types. | 114 template <typename T> |
114 class MachineSignature { | 115 class Signature : public ZoneObject { |
115 public: | 116 public: |
116 MachineSignature(uint8_t return_count, uint16_t param_count, | 117 Signature(size_t return_count, size_t parameter_count, T* reps) |
117 MachineType* reps) | 118 : return_count_(return_count), |
118 : return_count_(return_count), param_count_(param_count), reps_(reps) {} | 119 parameter_count_(parameter_count), |
| 120 reps_(reps) {} |
119 | 121 |
120 int GetReturnCount() const { return return_count_; } | 122 size_t return_count() const { return return_count_; } |
121 int GetParamCount() const { return param_count_; } | 123 size_t parameter_count() const { return parameter_count_; } |
122 | 124 |
123 MachineType GetParameterType(int index) const { | 125 T GetParam(size_t index) const { |
124 DCHECK(index >= 0 && index < param_count_); | 126 DCHECK(index < parameter_count_); |
125 return reps_[return_count_ + index]; | 127 return reps_[return_count_ + index]; |
126 } | 128 } |
127 | 129 |
128 MachineType GetReturnType(int index = 0) const { | 130 T GetReturn(size_t index = 0) const { |
129 DCHECK(index >= 0 && index < return_count_); | 131 DCHECK(index < return_count_); |
130 return reps_[index]; | 132 return reps_[index]; |
131 } | 133 } |
132 | 134 |
| 135 // For incrementally building signatures. |
| 136 class Builder { |
| 137 public: |
| 138 Builder(Zone* zone, size_t return_count, size_t parameter_count) |
| 139 : return_count_(return_count), |
| 140 parameter_count_(parameter_count), |
| 141 zone_(zone), |
| 142 rcursor_(0), |
| 143 pcursor_(0), |
| 144 buffer_(zone->NewArray<T>( |
| 145 static_cast<int>(return_count + parameter_count))) {} |
| 146 |
| 147 const size_t return_count_; |
| 148 const size_t parameter_count_; |
| 149 |
| 150 void AddReturn(T val) { |
| 151 DCHECK(rcursor_ < return_count_); |
| 152 buffer_[rcursor_++] = val; |
| 153 } |
| 154 void AddParam(T val) { |
| 155 DCHECK(pcursor_ < parameter_count_); |
| 156 buffer_[return_count_ + pcursor_++] = val; |
| 157 } |
| 158 Signature<T>* Build() { |
| 159 DCHECK(rcursor_ == return_count_); |
| 160 DCHECK(pcursor_ == parameter_count_); |
| 161 return new (zone_) Signature<T>(return_count_, parameter_count_, buffer_); |
| 162 } |
| 163 |
| 164 private: |
| 165 Zone* zone_; |
| 166 size_t rcursor_; |
| 167 size_t pcursor_; |
| 168 T* buffer_; |
| 169 }; |
| 170 |
133 protected: | 171 protected: |
134 uint8_t return_count_; | 172 size_t return_count_; |
135 uint16_t param_count_; | 173 size_t parameter_count_; |
136 MachineType* reps_; | 174 T* reps_; |
137 }; | 175 }; |
| 176 |
| 177 typedef Signature<MachineType> MachineSignature; |
138 } // namespace compiler | 178 } // namespace compiler |
139 } // namespace internal | 179 } // namespace internal |
140 } // namespace v8 | 180 } // namespace v8 |
141 | 181 |
142 #endif // V8_COMPILER_MACHINE_TYPE_H_ | 182 #endif // V8_COMPILER_MACHINE_TYPE_H_ |
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