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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 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_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ | 5 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ |
6 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ | 6 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "src/ast.h" | 10 #include "src/ast.h" |
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21 namespace interpreter { | 21 namespace interpreter { |
22 | 22 |
23 class BytecodeLabel; | 23 class BytecodeLabel; |
24 class Register; | 24 class Register; |
25 | 25 |
26 class BytecodeArrayBuilder { | 26 class BytecodeArrayBuilder { |
27 public: | 27 public: |
28 BytecodeArrayBuilder(Isolate* isolate, Zone* zone); | 28 BytecodeArrayBuilder(Isolate* isolate, Zone* zone); |
29 Handle<BytecodeArray> ToBytecodeArray(); | 29 Handle<BytecodeArray> ToBytecodeArray(); |
30 | 30 |
31 // Set number of parameters expected by function. | 31 // Set the number of parameters expected by function. |
32 void set_parameter_count(int number_of_params); | 32 void set_parameter_count(int number_of_params); |
33 int parameter_count() const { | 33 int parameter_count() const { |
34 DCHECK_GE(parameter_count_, 0); | 34 DCHECK_GE(parameter_count_, 0); |
35 return parameter_count_; | 35 return parameter_count_; |
36 } | 36 } |
37 | 37 |
38 // Set number of locals required for bytecode array. | 38 // Set the number of locals required for bytecode array. |
39 void set_locals_count(int number_of_locals); | 39 void set_locals_count(int number_of_locals); |
40 int locals_count() const { | 40 int locals_count() const { |
41 DCHECK_GE(local_register_count_, 0); | 41 DCHECK_GE(local_register_count_, 0); |
42 return local_register_count_; | 42 return local_register_count_; |
43 } | 43 } |
44 | 44 |
45 // Set number of contexts required for bytecode array. | 45 // Set number of contexts required for bytecode array. |
46 void set_context_count(int number_of_contexts); | 46 void set_context_count(int number_of_contexts); |
47 int context_count() const { | 47 int context_count() const { |
48 DCHECK_GE(context_register_count_, 0); | 48 DCHECK_GE(context_register_count_, 0); |
49 return context_register_count_; | 49 return context_register_count_; |
50 } | 50 } |
51 | 51 |
52 Register first_context_register() const; | 52 Register first_context_register() const; |
53 Register last_context_register() const; | 53 Register last_context_register() const; |
54 | 54 |
55 // Returns the number of fixed (non-temporary) registers. | 55 // Returns the number of fixed (non-temporary) registers. |
56 int fixed_register_count() const { return context_count() + locals_count(); } | 56 int fixed_register_count() const { return context_count() + locals_count(); } |
57 | 57 |
58 Register Parameter(int parameter_index) const; | 58 Register Parameter(int parameter_index) const; |
59 | 59 |
60 // Constant loads to the accumulator. | 60 // Return true if the register |reg| represents a parameter or a |
61 // local. | |
62 bool RegisterIsParameterOrLocal(Register reg) const; | |
63 | |
64 // Constant loads to accumulator. | |
61 BytecodeArrayBuilder& LoadLiteral(v8::internal::Smi* value); | 65 BytecodeArrayBuilder& LoadLiteral(v8::internal::Smi* value); |
62 BytecodeArrayBuilder& LoadLiteral(Handle<Object> object); | 66 BytecodeArrayBuilder& LoadLiteral(Handle<Object> object); |
63 BytecodeArrayBuilder& LoadUndefined(); | 67 BytecodeArrayBuilder& LoadUndefined(); |
64 BytecodeArrayBuilder& LoadNull(); | 68 BytecodeArrayBuilder& LoadNull(); |
65 BytecodeArrayBuilder& LoadTheHole(); | 69 BytecodeArrayBuilder& LoadTheHole(); |
66 BytecodeArrayBuilder& LoadTrue(); | 70 BytecodeArrayBuilder& LoadTrue(); |
67 BytecodeArrayBuilder& LoadFalse(); | 71 BytecodeArrayBuilder& LoadFalse(); |
68 | 72 |
69 // Global loads to accumulator and stores from the accumulator. | 73 // Global loads to the accumulator and stores from the accumulator. |
70 BytecodeArrayBuilder& LoadGlobal(int slot_index); | 74 BytecodeArrayBuilder& LoadGlobal(int slot_index); |
71 BytecodeArrayBuilder& StoreGlobal(int slot_index, LanguageMode language_mode); | 75 BytecodeArrayBuilder& StoreGlobal(int slot_index, LanguageMode language_mode); |
72 | 76 |
73 // Load the object at |slot_index| in |context| into the accumulator. | 77 // Load the object at |slot_index| in |context| into the accumulator. |
74 BytecodeArrayBuilder& LoadContextSlot(Register context, int slot_index); | 78 BytecodeArrayBuilder& LoadContextSlot(Register context, int slot_index); |
75 | 79 |
76 // Stores the object in the accumulator into |slot_index| of |context|. | 80 // Stores the object in the accumulator into |slot_index| of |context|. |
77 BytecodeArrayBuilder& StoreContextSlot(Register context, int slot_index); | 81 BytecodeArrayBuilder& StoreContextSlot(Register context, int slot_index); |
78 | 82 |
79 // Register-accumulator transfers. | 83 // Register-accumulator transfers. |
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133 Strength strength); | 137 Strength strength); |
134 | 138 |
135 // Unary Operators. | 139 // Unary Operators. |
136 BytecodeArrayBuilder& LogicalNot(); | 140 BytecodeArrayBuilder& LogicalNot(); |
137 BytecodeArrayBuilder& TypeOf(); | 141 BytecodeArrayBuilder& TypeOf(); |
138 | 142 |
139 // Tests. | 143 // Tests. |
140 BytecodeArrayBuilder& CompareOperation(Token::Value op, Register reg, | 144 BytecodeArrayBuilder& CompareOperation(Token::Value op, Register reg, |
141 Strength strength); | 145 Strength strength); |
142 | 146 |
143 // Casts | 147 // Casts. |
144 BytecodeArrayBuilder& CastAccumulatorToBoolean(); | 148 BytecodeArrayBuilder& CastAccumulatorToBoolean(); |
145 BytecodeArrayBuilder& CastAccumulatorToName(); | 149 BytecodeArrayBuilder& CastAccumulatorToName(); |
146 | 150 |
147 // Flow Control. | 151 // Flow Control. |
148 BytecodeArrayBuilder& Bind(BytecodeLabel* label); | 152 BytecodeArrayBuilder& Bind(BytecodeLabel* label); |
149 BytecodeArrayBuilder& Bind(const BytecodeLabel& target, BytecodeLabel* label); | 153 BytecodeArrayBuilder& Bind(const BytecodeLabel& target, BytecodeLabel* label); |
150 | 154 |
151 BytecodeArrayBuilder& Jump(BytecodeLabel* label); | 155 BytecodeArrayBuilder& Jump(BytecodeLabel* label); |
152 BytecodeArrayBuilder& JumpIfTrue(BytecodeLabel* label); | 156 BytecodeArrayBuilder& JumpIfTrue(BytecodeLabel* label); |
153 BytecodeArrayBuilder& JumpIfFalse(BytecodeLabel* label); | 157 BytecodeArrayBuilder& JumpIfFalse(BytecodeLabel* label); |
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199 | 203 |
200 void EnsureReturn(); | 204 void EnsureReturn(); |
201 | 205 |
202 bool OperandIsValid(Bytecode bytecode, int operand_index, | 206 bool OperandIsValid(Bytecode bytecode, int operand_index, |
203 uint32_t operand_value) const; | 207 uint32_t operand_value) const; |
204 bool LastBytecodeInSameBlock() const; | 208 bool LastBytecodeInSameBlock() const; |
205 | 209 |
206 size_t GetConstantPoolEntry(Handle<Object> object); | 210 size_t GetConstantPoolEntry(Handle<Object> object); |
207 | 211 |
208 // Scope helpers used by TemporaryRegisterScope | 212 // Scope helpers used by TemporaryRegisterScope |
213 Register first_temporary_register() const; | |
214 Register last_temporary_register() const; | |
rmcilroy
2015/10/19 12:56:22
nit - move getters below TemporaryRegisterIsLive()
oth
2015/10/20 15:28:52
Done.
| |
209 int BorrowTemporaryRegister(); | 215 int BorrowTemporaryRegister(); |
210 void ReturnTemporaryRegister(int reg_index); | 216 void ReturnTemporaryRegister(int reg_index); |
217 void PrepareForConsecutiveTemporaryRegisters(size_t count); | |
218 bool TemporaryRegisterIsLive(Register reg) const; | |
211 | 219 |
212 Isolate* isolate_; | 220 Isolate* isolate_; |
213 Zone* zone_; | 221 Zone* zone_; |
214 ZoneVector<uint8_t> bytecodes_; | 222 ZoneVector<uint8_t> bytecodes_; |
215 bool bytecode_generated_; | 223 bool bytecode_generated_; |
216 size_t last_block_end_; | 224 size_t last_block_end_; |
217 size_t last_bytecode_start_; | 225 size_t last_bytecode_start_; |
218 bool return_seen_in_block_; | 226 bool return_seen_in_block_; |
219 | 227 |
220 IdentityMap<size_t> constants_map_; | 228 IdentityMap<size_t> constants_map_; |
221 ZoneVector<Handle<Object>> constants_; | 229 ZoneVector<Handle<Object>> constants_; |
222 | 230 |
223 int parameter_count_; | 231 int parameter_count_; |
224 int local_register_count_; | 232 int local_register_count_; |
225 int context_register_count_; | 233 int context_register_count_; |
234 ZoneVector<int> free_temporaries_; | |
226 int temporary_register_count_; | 235 int temporary_register_count_; |
227 int temporary_register_next_; | |
228 | 236 |
229 friend class TemporaryRegisterScope; | 237 friend class TemporaryRegisterScope; |
230 DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArrayBuilder); | 238 DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder); |
231 }; | 239 }; |
232 | 240 |
233 | 241 |
234 // A label representing a branch target in a bytecode array. When a | 242 // A label representing a branch target in a bytecode array. When a |
235 // label is bound, it represents a known position in the bytecode | 243 // label is bound, it represents a known position in the bytecode |
236 // array. For labels that are forward references there can be at most | 244 // array. For labels that are forward references there can be at most |
237 // one reference whilst it is unbound. | 245 // one reference whilst it is unbound. |
238 class BytecodeLabel final { | 246 class BytecodeLabel final { |
239 public: | 247 public: |
240 BytecodeLabel() : bound_(false), offset_(kInvalidOffset) {} | 248 BytecodeLabel() : bound_(false), offset_(kInvalidOffset) {} |
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269 }; | 277 }; |
270 | 278 |
271 | 279 |
272 // A stack-allocated class than allows the instantiator to allocate | 280 // A stack-allocated class than allows the instantiator to allocate |
273 // temporary registers that are cleaned up when scope is closed. | 281 // temporary registers that are cleaned up when scope is closed. |
274 class TemporaryRegisterScope { | 282 class TemporaryRegisterScope { |
275 public: | 283 public: |
276 explicit TemporaryRegisterScope(BytecodeArrayBuilder* builder); | 284 explicit TemporaryRegisterScope(BytecodeArrayBuilder* builder); |
277 ~TemporaryRegisterScope(); | 285 ~TemporaryRegisterScope(); |
278 Register NewRegister(); | 286 Register NewRegister(); |
287 void PrepareForConsecutiveAllocations(size_t count); | |
279 | 288 |
280 private: | 289 private: |
281 void* operator new(size_t size); | 290 void* operator new(size_t size); |
282 void operator delete(void* p); | 291 void operator delete(void* p); |
283 | 292 |
284 BytecodeArrayBuilder* builder_; | 293 BytecodeArrayBuilder* builder_; |
285 int count_; | 294 const TemporaryRegisterScope* outer_; |
286 int last_register_index_; | 295 ZoneVector<int> allocated_; |
287 | 296 |
288 DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope); | 297 DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope); |
289 }; | 298 }; |
290 | 299 |
291 | 300 |
292 } // namespace interpreter | 301 } // namespace interpreter |
293 } // namespace internal | 302 } // namespace internal |
294 } // namespace v8 | 303 } // namespace v8 |
295 | 304 |
296 #endif // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ | 305 #endif // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_ |
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