kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_DEOPTIMIZER_H_ |
| 29 | #define V8_DEOPTIMIZER_H_ |
| 30 | |
| 31 | #include "v8.h" |
| 32 | |
lrn@chromium.org | 1c09276 | 2011-05-09 09:42:16 +0000 | [diff] [blame] | 33 | #include "allocation.h" |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 34 | #include "macro-assembler.h" |
| 35 | #include "zone-inl.h" |
| 36 | |
| 37 | |
| 38 | namespace v8 { |
| 39 | namespace internal { |
| 40 | |
| 41 | class FrameDescription; |
| 42 | class TranslationIterator; |
| 43 | class DeoptimizingCodeListNode; |
| 44 | |
| 45 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 46 | class HeapNumberMaterializationDescriptor BASE_EMBEDDED { |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 47 | public: |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 48 | HeapNumberMaterializationDescriptor(Address slot_address, double val) |
| 49 | : slot_address_(slot_address), val_(val) { } |
| 50 | |
| 51 | Address slot_address() const { return slot_address_; } |
| 52 | double value() const { return val_; } |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 53 | |
| 54 | private: |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 55 | Address slot_address_; |
| 56 | double val_; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | |
| 60 | class OptimizedFunctionVisitor BASE_EMBEDDED { |
| 61 | public: |
| 62 | virtual ~OptimizedFunctionVisitor() {} |
| 63 | |
| 64 | // Function which is called before iteration of any optimized functions |
| 65 | // from given global context. |
| 66 | virtual void EnterContext(Context* context) = 0; |
| 67 | |
| 68 | virtual void VisitFunction(JSFunction* function) = 0; |
| 69 | |
| 70 | // Function which is called after iteration of all optimized functions |
| 71 | // from given global context. |
| 72 | virtual void LeaveContext(Context* context) = 0; |
| 73 | }; |
| 74 | |
| 75 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 76 | class Deoptimizer; |
| 77 | |
| 78 | |
| 79 | class DeoptimizerData { |
| 80 | public: |
| 81 | DeoptimizerData(); |
| 82 | ~DeoptimizerData(); |
| 83 | |
| 84 | private: |
| 85 | LargeObjectChunk* eager_deoptimization_entry_code_; |
| 86 | LargeObjectChunk* lazy_deoptimization_entry_code_; |
| 87 | Deoptimizer* current_; |
| 88 | |
| 89 | // List of deoptimized code which still have references from active stack |
| 90 | // frames. These code objects are needed by the deoptimizer when deoptimizing |
| 91 | // a frame for which the code object for the function function has been |
| 92 | // changed from the code present when deoptimizing was done. |
| 93 | DeoptimizingCodeListNode* deoptimizing_code_list_; |
| 94 | |
| 95 | friend class Deoptimizer; |
| 96 | |
| 97 | DISALLOW_COPY_AND_ASSIGN(DeoptimizerData); |
| 98 | }; |
| 99 | |
| 100 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 101 | class Deoptimizer : public Malloced { |
| 102 | public: |
| 103 | enum BailoutType { |
| 104 | EAGER, |
| 105 | LAZY, |
| 106 | OSR |
| 107 | }; |
| 108 | |
| 109 | int output_count() const { return output_count_; } |
| 110 | |
| 111 | static Deoptimizer* New(JSFunction* function, |
| 112 | BailoutType type, |
| 113 | unsigned bailout_id, |
| 114 | Address from, |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 115 | int fp_to_sp_delta, |
| 116 | Isolate* isolate); |
| 117 | static Deoptimizer* Grab(Isolate* isolate); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 118 | |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 119 | // Makes sure that there is enough room in the relocation |
| 120 | // information of a code object to perform lazy deoptimization |
| 121 | // patching. If there is not enough room a new relocation |
| 122 | // information object is allocated and comments are added until it |
| 123 | // is big enough. |
| 124 | static void EnsureRelocSpaceForLazyDeoptimization(Handle<Code> code); |
| 125 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 126 | // Deoptimize the function now. Its current optimized code will never be run |
| 127 | // again and any activations of the optimized code will get deoptimized when |
| 128 | // execution returns. |
| 129 | static void DeoptimizeFunction(JSFunction* function); |
| 130 | |
| 131 | // Deoptimize all functions in the heap. |
| 132 | static void DeoptimizeAll(); |
| 133 | |
| 134 | static void DeoptimizeGlobalObject(JSObject* object); |
| 135 | |
| 136 | static void VisitAllOptimizedFunctionsForContext( |
| 137 | Context* context, OptimizedFunctionVisitor* visitor); |
| 138 | |
| 139 | static void VisitAllOptimizedFunctionsForGlobalObject( |
| 140 | JSObject* object, OptimizedFunctionVisitor* visitor); |
| 141 | |
| 142 | static void VisitAllOptimizedFunctions(OptimizedFunctionVisitor* visitor); |
| 143 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 144 | // The size in bytes of the code required at a lazy deopt patch site. |
| 145 | static int patch_size(); |
| 146 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 147 | // Patch all stack guard checks in the unoptimized code to |
| 148 | // unconditionally call replacement_code. |
| 149 | static void PatchStackCheckCode(Code* unoptimized_code, |
| 150 | Code* check_code, |
| 151 | Code* replacement_code); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 152 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 153 | // Patch stack guard check at instruction before pc_after in |
| 154 | // the unoptimized code to unconditionally call replacement_code. |
| 155 | static void PatchStackCheckCodeAt(Address pc_after, |
| 156 | Code* check_code, |
| 157 | Code* replacement_code); |
| 158 | |
ager@chromium.org | 0ee099b | 2011-01-25 14:06:47 +0000 | [diff] [blame] | 159 | // Change all patched stack guard checks in the unoptimized code |
| 160 | // back to a normal stack guard check. |
| 161 | static void RevertStackCheckCode(Code* unoptimized_code, |
| 162 | Code* check_code, |
| 163 | Code* replacement_code); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 164 | |
kmillikin@chromium.org | 31b1277 | 2011-02-02 16:08:26 +0000 | [diff] [blame] | 165 | // Change all patched stack guard checks in the unoptimized code |
| 166 | // back to a normal stack guard check. |
| 167 | static void RevertStackCheckCodeAt(Address pc_after, |
| 168 | Code* check_code, |
| 169 | Code* replacement_code); |
| 170 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 171 | ~Deoptimizer(); |
| 172 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 173 | void MaterializeHeapNumbers(); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 174 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 175 | static void ComputeOutputFrames(Deoptimizer* deoptimizer); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 176 | |
| 177 | static Address GetDeoptimizationEntry(int id, BailoutType type); |
| 178 | static int GetDeoptimizationId(Address addr, BailoutType type); |
fschneider@chromium.org | 9e3e0b6 | 2011-01-03 10:16:46 +0000 | [diff] [blame] | 179 | static int GetOutputInfo(DeoptimizationOutputData* data, |
| 180 | unsigned node_id, |
| 181 | SharedFunctionInfo* shared); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 182 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 183 | // Code generation support. |
| 184 | static int input_offset() { return OFFSET_OF(Deoptimizer, input_); } |
| 185 | static int output_count_offset() { |
| 186 | return OFFSET_OF(Deoptimizer, output_count_); |
| 187 | } |
| 188 | static int output_offset() { return OFFSET_OF(Deoptimizer, output_); } |
| 189 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 190 | static int GetDeoptimizedCodeCount(Isolate* isolate); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 191 | |
| 192 | static const int kNotDeoptimizationEntry = -1; |
| 193 | |
| 194 | // Generators for the deoptimization entry code. |
| 195 | class EntryGenerator BASE_EMBEDDED { |
| 196 | public: |
| 197 | EntryGenerator(MacroAssembler* masm, BailoutType type) |
| 198 | : masm_(masm), type_(type) { } |
| 199 | virtual ~EntryGenerator() { } |
| 200 | |
| 201 | void Generate(); |
| 202 | |
| 203 | protected: |
| 204 | MacroAssembler* masm() const { return masm_; } |
| 205 | BailoutType type() const { return type_; } |
| 206 | |
| 207 | virtual void GeneratePrologue() { } |
| 208 | |
| 209 | private: |
| 210 | MacroAssembler* masm_; |
| 211 | Deoptimizer::BailoutType type_; |
| 212 | }; |
| 213 | |
| 214 | class TableEntryGenerator : public EntryGenerator { |
| 215 | public: |
| 216 | TableEntryGenerator(MacroAssembler* masm, BailoutType type, int count) |
| 217 | : EntryGenerator(masm, type), count_(count) { } |
| 218 | |
| 219 | protected: |
| 220 | virtual void GeneratePrologue(); |
| 221 | |
| 222 | private: |
| 223 | int count() const { return count_; } |
| 224 | |
| 225 | int count_; |
| 226 | }; |
| 227 | |
| 228 | private: |
| 229 | static const int kNumberOfEntries = 4096; |
| 230 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 231 | Deoptimizer(Isolate* isolate, |
| 232 | JSFunction* function, |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 233 | BailoutType type, |
| 234 | unsigned bailout_id, |
| 235 | Address from, |
| 236 | int fp_to_sp_delta); |
| 237 | void DeleteFrameDescriptions(); |
| 238 | |
| 239 | void DoComputeOutputFrames(); |
| 240 | void DoComputeOsrOutputFrame(); |
| 241 | void DoComputeFrame(TranslationIterator* iterator, int frame_index); |
| 242 | void DoTranslateCommand(TranslationIterator* iterator, |
| 243 | int frame_index, |
| 244 | unsigned output_offset); |
| 245 | // Translate a command for OSR. Updates the input offset to be used for |
| 246 | // the next command. Returns false if translation of the command failed |
| 247 | // (e.g., a number conversion failed) and may or may not have updated the |
| 248 | // input offset. |
| 249 | bool DoOsrTranslateCommand(TranslationIterator* iterator, |
| 250 | int* input_offset); |
| 251 | |
| 252 | unsigned ComputeInputFrameSize() const; |
| 253 | unsigned ComputeFixedSize(JSFunction* function) const; |
| 254 | |
| 255 | unsigned ComputeIncomingArgumentSize(JSFunction* function) const; |
| 256 | unsigned ComputeOutgoingArgumentSize() const; |
| 257 | |
| 258 | Object* ComputeLiteral(int index) const; |
| 259 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 260 | void AddDoubleValue(intptr_t slot_address, double value); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 261 | |
| 262 | static LargeObjectChunk* CreateCode(BailoutType type); |
| 263 | static void GenerateDeoptimizationEntries( |
| 264 | MacroAssembler* masm, int count, BailoutType type); |
| 265 | |
| 266 | // Weak handle callback for deoptimizing code objects. |
| 267 | static void HandleWeakDeoptimizedCode( |
| 268 | v8::Persistent<v8::Value> obj, void* data); |
| 269 | static Code* FindDeoptimizingCodeFromAddress(Address addr); |
| 270 | static void RemoveDeoptimizingCode(Code* code); |
| 271 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 272 | Isolate* isolate_; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 273 | JSFunction* function_; |
| 274 | Code* optimized_code_; |
| 275 | unsigned bailout_id_; |
| 276 | BailoutType bailout_type_; |
| 277 | Address from_; |
| 278 | int fp_to_sp_delta_; |
| 279 | |
| 280 | // Input frame description. |
| 281 | FrameDescription* input_; |
| 282 | // Number of output frames. |
| 283 | int output_count_; |
| 284 | // Array of output frame descriptions. |
| 285 | FrameDescription** output_; |
| 286 | |
karlklose@chromium.org | 44bc708 | 2011-04-11 12:33:05 +0000 | [diff] [blame] | 287 | List<HeapNumberMaterializationDescriptor> deferred_heap_numbers_; |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 288 | |
| 289 | static int table_entry_size_; |
| 290 | |
| 291 | friend class FrameDescription; |
| 292 | friend class DeoptimizingCodeListNode; |
| 293 | }; |
| 294 | |
| 295 | |
| 296 | class FrameDescription { |
| 297 | public: |
| 298 | FrameDescription(uint32_t frame_size, |
| 299 | JSFunction* function); |
| 300 | |
| 301 | void* operator new(size_t size, uint32_t frame_size) { |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 302 | // Subtracts kPointerSize, as the member frame_content_ already supplies |
| 303 | // the first element of the area to store the frame. |
| 304 | return malloc(size + frame_size - kPointerSize); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | void operator delete(void* description) { |
| 308 | free(description); |
| 309 | } |
| 310 | |
| 311 | intptr_t GetFrameSize() const { return frame_size_; } |
| 312 | |
| 313 | JSFunction* GetFunction() const { return function_; } |
| 314 | |
| 315 | unsigned GetOffsetFromSlotIndex(Deoptimizer* deoptimizer, int slot_index); |
| 316 | |
| 317 | intptr_t GetFrameSlot(unsigned offset) { |
| 318 | return *GetFrameSlotPointer(offset); |
| 319 | } |
| 320 | |
| 321 | double GetDoubleFrameSlot(unsigned offset) { |
| 322 | return *reinterpret_cast<double*>(GetFrameSlotPointer(offset)); |
| 323 | } |
| 324 | |
| 325 | void SetFrameSlot(unsigned offset, intptr_t value) { |
| 326 | *GetFrameSlotPointer(offset) = value; |
| 327 | } |
| 328 | |
| 329 | intptr_t GetRegister(unsigned n) const { |
| 330 | ASSERT(n < ARRAY_SIZE(registers_)); |
| 331 | return registers_[n]; |
| 332 | } |
| 333 | |
| 334 | double GetDoubleRegister(unsigned n) const { |
| 335 | ASSERT(n < ARRAY_SIZE(double_registers_)); |
| 336 | return double_registers_[n]; |
| 337 | } |
| 338 | |
| 339 | void SetRegister(unsigned n, intptr_t value) { |
| 340 | ASSERT(n < ARRAY_SIZE(registers_)); |
| 341 | registers_[n] = value; |
| 342 | } |
| 343 | |
| 344 | void SetDoubleRegister(unsigned n, double value) { |
| 345 | ASSERT(n < ARRAY_SIZE(double_registers_)); |
| 346 | double_registers_[n] = value; |
| 347 | } |
| 348 | |
| 349 | intptr_t GetTop() const { return top_; } |
| 350 | void SetTop(intptr_t top) { top_ = top; } |
| 351 | |
| 352 | intptr_t GetPc() const { return pc_; } |
| 353 | void SetPc(intptr_t pc) { pc_ = pc; } |
| 354 | |
| 355 | intptr_t GetFp() const { return fp_; } |
| 356 | void SetFp(intptr_t fp) { fp_ = fp; } |
| 357 | |
| 358 | Smi* GetState() const { return state_; } |
| 359 | void SetState(Smi* state) { state_ = state; } |
| 360 | |
| 361 | void SetContinuation(intptr_t pc) { continuation_ = pc; } |
| 362 | |
| 363 | static int registers_offset() { |
| 364 | return OFFSET_OF(FrameDescription, registers_); |
| 365 | } |
| 366 | |
| 367 | static int double_registers_offset() { |
| 368 | return OFFSET_OF(FrameDescription, double_registers_); |
| 369 | } |
| 370 | |
| 371 | static int frame_size_offset() { |
| 372 | return OFFSET_OF(FrameDescription, frame_size_); |
| 373 | } |
| 374 | |
| 375 | static int pc_offset() { |
| 376 | return OFFSET_OF(FrameDescription, pc_); |
| 377 | } |
| 378 | |
| 379 | static int state_offset() { |
| 380 | return OFFSET_OF(FrameDescription, state_); |
| 381 | } |
| 382 | |
| 383 | static int continuation_offset() { |
| 384 | return OFFSET_OF(FrameDescription, continuation_); |
| 385 | } |
| 386 | |
| 387 | static int frame_content_offset() { |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 388 | return OFFSET_OF(FrameDescription, frame_content_); |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | private: |
| 392 | static const uint32_t kZapUint32 = 0xbeeddead; |
| 393 | |
| 394 | uintptr_t frame_size_; // Number of bytes. |
| 395 | JSFunction* function_; |
| 396 | intptr_t registers_[Register::kNumRegisters]; |
| 397 | double double_registers_[DoubleRegister::kNumAllocatableRegisters]; |
| 398 | intptr_t top_; |
| 399 | intptr_t pc_; |
| 400 | intptr_t fp_; |
| 401 | Smi* state_; |
| 402 | |
| 403 | // Continuation is the PC where the execution continues after |
| 404 | // deoptimizing. |
| 405 | intptr_t continuation_; |
| 406 | |
fschneider@chromium.org | 7979bbb | 2011-03-28 10:47:03 +0000 | [diff] [blame] | 407 | // This must be at the end of the object as the object is allocated larger |
| 408 | // than it's definition indicate to extend this array. |
| 409 | intptr_t frame_content_[1]; |
| 410 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 411 | intptr_t* GetFrameSlotPointer(unsigned offset) { |
| 412 | ASSERT(offset < frame_size_); |
| 413 | return reinterpret_cast<intptr_t*>( |
| 414 | reinterpret_cast<Address>(this) + frame_content_offset() + offset); |
| 415 | } |
| 416 | }; |
| 417 | |
| 418 | |
| 419 | class TranslationBuffer BASE_EMBEDDED { |
| 420 | public: |
| 421 | TranslationBuffer() : contents_(256) { } |
| 422 | |
| 423 | int CurrentIndex() const { return contents_.length(); } |
| 424 | void Add(int32_t value); |
| 425 | |
| 426 | Handle<ByteArray> CreateByteArray(); |
| 427 | |
| 428 | private: |
| 429 | ZoneList<uint8_t> contents_; |
| 430 | }; |
| 431 | |
| 432 | |
| 433 | class TranslationIterator BASE_EMBEDDED { |
| 434 | public: |
| 435 | TranslationIterator(ByteArray* buffer, int index) |
| 436 | : buffer_(buffer), index_(index) { |
| 437 | ASSERT(index >= 0 && index < buffer->length()); |
| 438 | } |
| 439 | |
| 440 | int32_t Next(); |
| 441 | |
| 442 | bool HasNext() const { return index_ >= 0; } |
| 443 | |
| 444 | void Done() { index_ = -1; } |
| 445 | |
| 446 | void Skip(int n) { |
| 447 | for (int i = 0; i < n; i++) Next(); |
| 448 | } |
| 449 | |
| 450 | private: |
| 451 | ByteArray* buffer_; |
| 452 | int index_; |
| 453 | }; |
| 454 | |
| 455 | |
| 456 | class Translation BASE_EMBEDDED { |
| 457 | public: |
| 458 | enum Opcode { |
| 459 | BEGIN, |
| 460 | FRAME, |
| 461 | REGISTER, |
| 462 | INT32_REGISTER, |
| 463 | DOUBLE_REGISTER, |
| 464 | STACK_SLOT, |
| 465 | INT32_STACK_SLOT, |
| 466 | DOUBLE_STACK_SLOT, |
| 467 | LITERAL, |
| 468 | ARGUMENTS_OBJECT, |
| 469 | |
| 470 | // A prefix indicating that the next command is a duplicate of the one |
| 471 | // that follows it. |
| 472 | DUPLICATE |
| 473 | }; |
| 474 | |
| 475 | Translation(TranslationBuffer* buffer, int frame_count) |
| 476 | : buffer_(buffer), |
| 477 | index_(buffer->CurrentIndex()) { |
| 478 | buffer_->Add(BEGIN); |
| 479 | buffer_->Add(frame_count); |
| 480 | } |
| 481 | |
| 482 | int index() const { return index_; } |
| 483 | |
| 484 | // Commands. |
| 485 | void BeginFrame(int node_id, int literal_id, unsigned height); |
| 486 | void StoreRegister(Register reg); |
| 487 | void StoreInt32Register(Register reg); |
| 488 | void StoreDoubleRegister(DoubleRegister reg); |
| 489 | void StoreStackSlot(int index); |
| 490 | void StoreInt32StackSlot(int index); |
| 491 | void StoreDoubleStackSlot(int index); |
| 492 | void StoreLiteral(int literal_id); |
| 493 | void StoreArgumentsObject(); |
| 494 | void MarkDuplicate(); |
| 495 | |
| 496 | static int NumberOfOperandsFor(Opcode opcode); |
| 497 | |
whesse@chromium.org | 023421e | 2010-12-21 12:19:12 +0000 | [diff] [blame] | 498 | #ifdef OBJECT_PRINT |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 499 | static const char* StringFor(Opcode opcode); |
| 500 | #endif |
| 501 | |
| 502 | private: |
| 503 | TranslationBuffer* buffer_; |
| 504 | int index_; |
| 505 | }; |
| 506 | |
| 507 | |
| 508 | // Linked list holding deoptimizing code objects. The deoptimizing code objects |
| 509 | // are kept as weak handles until they are no longer activated on the stack. |
| 510 | class DeoptimizingCodeListNode : public Malloced { |
| 511 | public: |
| 512 | explicit DeoptimizingCodeListNode(Code* code); |
| 513 | ~DeoptimizingCodeListNode(); |
| 514 | |
| 515 | DeoptimizingCodeListNode* next() const { return next_; } |
| 516 | void set_next(DeoptimizingCodeListNode* next) { next_ = next; } |
| 517 | Handle<Code> code() const { return code_; } |
| 518 | |
| 519 | private: |
| 520 | // Global (weak) handle to the deoptimizing code object. |
| 521 | Handle<Code> code_; |
| 522 | |
| 523 | // Next pointer for linked list. |
| 524 | DeoptimizingCodeListNode* next_; |
| 525 | }; |
| 526 | |
| 527 | |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 528 | class SlotRef BASE_EMBEDDED { |
| 529 | public: |
| 530 | enum SlotRepresentation { |
| 531 | UNKNOWN, |
| 532 | TAGGED, |
| 533 | INT32, |
| 534 | DOUBLE, |
| 535 | LITERAL |
| 536 | }; |
| 537 | |
| 538 | SlotRef() |
| 539 | : addr_(NULL), representation_(UNKNOWN) { } |
| 540 | |
| 541 | SlotRef(Address addr, SlotRepresentation representation) |
| 542 | : addr_(addr), representation_(representation) { } |
| 543 | |
| 544 | explicit SlotRef(Object* literal) |
| 545 | : literal_(literal), representation_(LITERAL) { } |
| 546 | |
| 547 | Handle<Object> GetValue() { |
| 548 | switch (representation_) { |
| 549 | case TAGGED: |
| 550 | return Handle<Object>(Memory::Object_at(addr_)); |
| 551 | |
| 552 | case INT32: { |
| 553 | int value = Memory::int32_at(addr_); |
| 554 | if (Smi::IsValid(value)) { |
| 555 | return Handle<Object>(Smi::FromInt(value)); |
| 556 | } else { |
| 557 | return Isolate::Current()->factory()->NewNumberFromInt(value); |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | case DOUBLE: { |
| 562 | double value = Memory::double_at(addr_); |
| 563 | return Isolate::Current()->factory()->NewNumber(value); |
| 564 | } |
| 565 | |
| 566 | case LITERAL: |
| 567 | return literal_; |
| 568 | |
| 569 | default: |
| 570 | UNREACHABLE(); |
| 571 | return Handle<Object>::null(); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | static void ComputeSlotMappingForArguments(JavaScriptFrame* frame, |
| 576 | int inlined_frame_index, |
| 577 | Vector<SlotRef>* args_slots); |
| 578 | |
| 579 | private: |
| 580 | Address addr_; |
| 581 | Handle<Object> literal_; |
| 582 | SlotRepresentation representation_; |
| 583 | |
| 584 | static Address SlotAddress(JavaScriptFrame* frame, int slot_index) { |
| 585 | if (slot_index >= 0) { |
| 586 | const int offset = JavaScriptFrameConstants::kLocal0Offset; |
| 587 | return frame->fp() + offset - (slot_index * kPointerSize); |
| 588 | } else { |
| 589 | const int offset = JavaScriptFrameConstants::kLastParameterOffset; |
| 590 | return frame->fp() + offset - ((slot_index + 1) * kPointerSize); |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | static SlotRef ComputeSlotForNextArgument(TranslationIterator* iterator, |
| 595 | DeoptimizationInputData* data, |
| 596 | JavaScriptFrame* frame); |
| 597 | }; |
| 598 | |
| 599 | |
kasperl@chromium.org | a555126 | 2010-12-07 12:49:48 +0000 | [diff] [blame] | 600 | } } // namespace v8::internal |
| 601 | |
| 602 | #endif // V8_DEOPTIMIZER_H_ |