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| 1 // Copyright 2009 the V8 project authors. All rights reserved. | |
| 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_VIRTUAL_FRAME_ARM_H_ | |
| 29 #define V8_VIRTUAL_FRAME_ARM_H_ | |
| 30 | |
| 31 #include "register-allocator.h" | |
| 32 | |
| 33 namespace v8 { namespace internal { | |
| 34 | |
| 35 // ------------------------------------------------------------------------- | |
| 36 // Virtual frames | |
| 37 // | |
| 38 // The virtual frame is an abstraction of the physical stack frame. It | |
| 39 // encapsulates the parameters, frame-allocated locals, and the expression | |
| 40 // stack. It supports push/pop operations on the expression stack, as well | |
| 41 // as random access to the expression stack elements, locals, and | |
| 42 // parameters. | |
| 43 | |
| 44 class VirtualFrame : public Malloced { | |
| 45 public: | |
| 46 // A utility class to introduce a scope where the virtual frame is | |
| 47 // expected to remain spilled. The constructor spills the code | |
| 48 // generator's current frame, but no attempt is made to require it | |
| 49 // to stay spilled. It is intended as documentation while the code | |
| 50 // generator is being transformed. | |
| 51 class SpilledScope BASE_EMBEDDED { | |
| 52 public: | |
| 53 explicit SpilledScope(CodeGenerator* cgen); | |
| 54 | |
| 55 ~SpilledScope(); | |
| 56 | |
| 57 private: | |
| 58 CodeGenerator* cgen_; | |
| 59 bool previous_state_; | |
| 60 }; | |
| 61 | |
| 62 // An illegal index into the virtual frame. | |
| 63 static const int kIllegalIndex = -1; | |
| 64 | |
| 65 // Construct an initial virtual frame on entry to a JS function. | |
| 66 explicit VirtualFrame(CodeGenerator* cgen); | |
| 67 | |
| 68 // Construct a virtual frame as a clone of an existing one. | |
| 69 explicit VirtualFrame(VirtualFrame* original); | |
| 70 | |
| 71 // Create a duplicate of an existing valid frame element. | |
| 72 FrameElement CopyElementAt(int index); | |
| 73 | |
| 74 // The height of the virtual expression stack. | |
| 75 int height() const { | |
| 76 return elements_.length() - expression_base_index(); | |
| 77 } | |
| 78 | |
| 79 int register_index(Register reg) { | |
| 80 return register_locations_[reg.code()]; | |
| 81 } | |
| 82 | |
| 83 bool is_used(int reg_code) { | |
| 84 return register_locations_[reg_code] != kIllegalIndex; | |
| 85 } | |
| 86 | |
| 87 bool is_used(Register reg) { | |
| 88 return is_used(reg.code()); | |
| 89 } | |
| 90 | |
| 91 // Add extra in-memory elements to the top of the frame to match an actual | |
| 92 // frame (eg, the frame after an exception handler is pushed). No code is | |
| 93 // emitted. | |
| 94 void Adjust(int count); | |
| 95 | |
| 96 // Forget elements from the top of the frame to match an actual frame (eg, | |
| 97 // the frame after a runtime call). No code is emitted. | |
| 98 void Forget(int count); | |
| 99 | |
| 100 // Forget count elements from the top of the frame without adjusting | |
| 101 // the stack pointer downward. This is used, for example, before | |
| 102 // merging frames at break, continue, and return targets. | |
| 103 void ForgetElements(int count); | |
| 104 | |
| 105 // Spill all values from the frame to memory. | |
| 106 void SpillAll(); | |
| 107 | |
| 108 // Spill all occurrences of a specific register from the frame. | |
| 109 void Spill(Register reg); | |
| 110 | |
| 111 // Spill all occurrences of an arbitrary register if possible. Return the | |
| 112 // register spilled or no_reg if it was not possible to free any register | |
| 113 // (ie, they all have frame-external references). | |
| 114 Register SpillAnyRegister(); | |
| 115 | |
| 116 // Prepare this virtual frame for merging to an expected frame by | |
| 117 // performing some state changes that do not require generating | |
| 118 // code. It is guaranteed that no code will be generated. | |
| 119 void PrepareMergeTo(VirtualFrame* expected); | |
| 120 | |
| 121 // Make this virtual frame have a state identical to an expected virtual | |
| 122 // frame. As a side effect, code may be emitted to make this frame match | |
| 123 // the expected one. | |
| 124 void MergeTo(VirtualFrame* expected); | |
| 125 | |
| 126 // Detach a frame from its code generator, perhaps temporarily. This | |
| 127 // tells the register allocator that it is free to use frame-internal | |
| 128 // registers. Used when the code generator's frame is switched from this | |
| 129 // one to NULL by an unconditional jump. | |
| 130 void DetachFromCodeGenerator(); | |
| 131 | |
| 132 // (Re)attach a frame to its code generator. This informs the register | |
| 133 // allocator that the frame-internal register references are active again. | |
| 134 // Used when a code generator's frame is switched from NULL to this one by | |
| 135 // binding a label. | |
| 136 void AttachToCodeGenerator(); | |
| 137 | |
| 138 // Emit code for the physical JS entry and exit frame sequences. After | |
| 139 // calling Enter, the virtual frame is ready for use; and after calling | |
| 140 // Exit it should not be used. Note that Enter does not allocate space in | |
| 141 // the physical frame for storing frame-allocated locals. | |
| 142 void Enter(); | |
| 143 void Exit(); | |
| 144 | |
| 145 // Prepare for returning from the frame by spilling locals and | |
| 146 // dropping all non-locals elements in the virtual frame. This | |
| 147 // avoids generating unnecessary merge code when jumping to the | |
| 148 // shared return site. Emits code for spills. | |
| 149 void PrepareForReturn(); | |
| 150 | |
| 151 // Allocate and initialize the frame-allocated locals. | |
| 152 void AllocateStackSlots(int count); | |
| 153 | |
| 154 // The current top of the expression stack as an assembly operand. | |
| 155 MemOperand Top() const { return MemOperand(sp, 0); } | |
| 156 | |
| 157 // An element of the expression stack as an assembly operand. | |
| 158 MemOperand ElementAt(int index) const { | |
| 159 return MemOperand(sp, index * kPointerSize); | |
| 160 } | |
| 161 | |
| 162 // Random-access store to a frame-top relative frame element. The result | |
| 163 // becomes owned by the frame and is invalidated. | |
| 164 void SetElementAt(int index, Result* value); | |
| 165 | |
| 166 // Set a frame element to a constant. The index is frame-top relative. | |
| 167 void SetElementAt(int index, Handle<Object> value) { | |
| 168 Result temp(value, cgen_); | |
| 169 SetElementAt(index, &temp); | |
| 170 } | |
| 171 | |
| 172 void PushElementAt(int index) { | |
| 173 PushFrameSlotAt(elements_.length() - index - 1); | |
| 174 } | |
| 175 | |
| 176 // A frame-allocated local as an assembly operand. | |
| 177 MemOperand LocalAt(int index) const { | |
| 178 ASSERT(0 <= index); | |
| 179 ASSERT(index < local_count_); | |
| 180 return MemOperand(fp, kLocal0Offset - index * kPointerSize); | |
| 181 } | |
| 182 | |
| 183 // Push a copy of the value of a local frame slot on top of the frame. | |
| 184 void PushLocalAt(int index) { | |
| 185 PushFrameSlotAt(local0_index() + index); | |
| 186 } | |
| 187 | |
| 188 // Push the value of a local frame slot on top of the frame and invalidate | |
| 189 // the local slot. The slot should be written to before trying to read | |
| 190 // from it again. | |
| 191 void TakeLocalAt(int index) { | |
| 192 TakeFrameSlotAt(local0_index() + index); | |
| 193 } | |
| 194 | |
| 195 // Store the top value on the virtual frame into a local frame slot. The | |
| 196 // value is left in place on top of the frame. | |
| 197 void StoreToLocalAt(int index) { | |
| 198 StoreToFrameSlotAt(local0_index() + index); | |
| 199 } | |
| 200 | |
| 201 // Push the address of the receiver slot on the frame. | |
| 202 void PushReceiverSlotAddress(); | |
| 203 | |
| 204 // The function frame slot. | |
| 205 MemOperand Function() const { return MemOperand(fp, kFunctionOffset); } | |
| 206 | |
| 207 // Push the function on top of the frame. | |
| 208 void PushFunction() { PushFrameSlotAt(function_index()); } | |
| 209 | |
| 210 // The context frame slot. | |
| 211 MemOperand Context() const { return MemOperand(fp, kContextOffset); } | |
| 212 | |
| 213 // Save the value of the esi register to the context frame slot. | |
| 214 void SaveContextRegister(); | |
| 215 | |
| 216 // Restore the esi register from the value of the context frame | |
| 217 // slot. | |
| 218 void RestoreContextRegister(); | |
| 219 | |
| 220 // A parameter as an assembly operand. | |
| 221 MemOperand ParameterAt(int index) const { | |
| 222 // Index -1 corresponds to the receiver. | |
| 223 ASSERT(-1 <= index && index <= parameter_count_); | |
| 224 return MemOperand(fp, (1 + parameter_count_ - index) * kPointerSize); | |
| 225 } | |
| 226 | |
| 227 // Push a copy of the value of a parameter frame slot on top of the frame. | |
| 228 void PushParameterAt(int index) { | |
| 229 PushFrameSlotAt(param0_index() + index); | |
| 230 } | |
| 231 | |
| 232 // Push the value of a paramter frame slot on top of the frame and | |
| 233 // invalidate the parameter slot. The slot should be written to before | |
| 234 // trying to read from it again. | |
| 235 void TakeParameterAt(int index) { | |
| 236 TakeFrameSlotAt(param0_index() + index); | |
| 237 } | |
| 238 | |
| 239 // Store the top value on the virtual frame into a parameter frame slot. | |
| 240 // The value is left in place on top of the frame. | |
| 241 void StoreToParameterAt(int index) { | |
| 242 StoreToFrameSlotAt(param0_index() + index); | |
| 243 } | |
| 244 | |
| 245 // The receiver frame slot. | |
| 246 MemOperand Receiver() const { return ParameterAt(-1); } | |
| 247 | |
| 248 // Push a try-catch or try-finally handler on top of the virtual frame. | |
| 249 void PushTryHandler(HandlerType type); | |
| 250 | |
| 251 // Call stub given the number of arguments it expects on (and | |
| 252 // removes from) the stack. | |
| 253 Result CallStub(CodeStub* stub, int arg_count); | |
| 254 | |
| 255 // Call stub that expects its argument in r0. The argument is given | |
| 256 // as a result which must be the register r0. | |
| 257 Result CallStub(CodeStub* stub, Result* arg); | |
| 258 | |
| 259 // Call stub that expects its arguments in r1 and r0. The arguments | |
| 260 // are given as results which must be the appropriate registers. | |
| 261 Result CallStub(CodeStub* stub, Result* arg0, Result* arg1); | |
| 262 | |
| 263 // Call runtime given the number of arguments expected on (and | |
| 264 // removed from) the stack. | |
| 265 Result CallRuntime(Runtime::Function* f, int arg_count); | |
| 266 Result CallRuntime(Runtime::FunctionId id, int arg_count); | |
| 267 | |
| 268 // Invoke builtin given the number of arguments it expects on (and | |
| 269 // removes from) the stack. | |
| 270 Result InvokeBuiltin(Builtins::JavaScript id, | |
| 271 InvokeJSFlags flag, | |
| 272 Result* arg_count_register, | |
| 273 int arg_count); | |
| 274 | |
| 275 // Call into an IC stub given the number of arguments it removes | |
| 276 // from the stack. Register arguments are passed as results and | |
| 277 // consumed by the call. | |
| 278 Result CallCodeObject(Handle<Code> ic, | |
| 279 RelocInfo::Mode rmode, | |
| 280 int dropped_args); | |
| 281 Result CallCodeObject(Handle<Code> ic, | |
| 282 RelocInfo::Mode rmode, | |
| 283 Result* arg, | |
| 284 int dropped_args); | |
| 285 Result CallCodeObject(Handle<Code> ic, | |
| 286 RelocInfo::Mode rmode, | |
| 287 Result* arg0, | |
| 288 Result* arg1, | |
| 289 int dropped_args); | |
| 290 | |
| 291 // Drop a number of elements from the top of the expression stack. May | |
| 292 // emit code to affect the physical frame. Does not clobber any registers | |
| 293 // excepting possibly the stack pointer. | |
| 294 void Drop(int count); | |
| 295 | |
| 296 // Drop one element. | |
| 297 void Drop() { Drop(1); } | |
| 298 | |
| 299 // Duplicate the top element of the frame. | |
| 300 void Dup() { PushFrameSlotAt(elements_.length() - 1); } | |
| 301 | |
| 302 // Pop an element from the top of the expression stack. Returns a | |
| 303 // Result, which may be a constant or a register. | |
| 304 Result Pop(); | |
| 305 | |
| 306 // Pop and save an element from the top of the expression stack and | |
| 307 // emit a corresponding pop instruction. | |
| 308 void EmitPop(Register reg); | |
| 309 | |
| 310 // Push an element on top of the expression stack and emit a | |
| 311 // corresponding push instruction. | |
| 312 void EmitPush(Register reg); | |
| 313 | |
| 314 // Push an element on the virtual frame. | |
| 315 void Push(Register reg, StaticType static_type = StaticType()); | |
| 316 void Push(Handle<Object> value); | |
| 317 void Push(Smi* value) { Push(Handle<Object>(value)); } | |
| 318 | |
| 319 // Pushing a result invalidates it (its contents become owned by the frame). | |
| 320 void Push(Result* result); | |
| 321 | |
| 322 // Nip removes zero or more elements from immediately below the top | |
| 323 // of the frame, leaving the previous top-of-frame value on top of | |
| 324 // the frame. Nip(k) is equivalent to x = Pop(), Drop(k), Push(x). | |
| 325 void Nip(int num_dropped); | |
| 326 | |
| 327 private: | |
| 328 static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset; | |
| 329 static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset; | |
| 330 static const int kContextOffset = StandardFrameConstants::kContextOffset; | |
| 331 | |
| 332 static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize; | |
| 333 static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots. | |
| 334 | |
| 335 CodeGenerator* cgen_; | |
| 336 MacroAssembler* masm_; | |
| 337 | |
| 338 List<FrameElement> elements_; | |
| 339 | |
| 340 // The number of frame-allocated locals and parameters respectively. | |
| 341 int parameter_count_; | |
| 342 int local_count_; | |
| 343 | |
| 344 // The index of the element that is at the processor's stack pointer | |
| 345 // (the sp register). | |
| 346 int stack_pointer_; | |
| 347 | |
| 348 // The index of the element that is at the processor's frame pointer | |
| 349 // (the fp register). | |
| 350 int frame_pointer_; | |
| 351 | |
| 352 // The index of the register frame element using each register, or | |
| 353 // kIllegalIndex if a register is not on the frame. | |
| 354 int register_locations_[kNumRegisters]; | |
| 355 | |
| 356 // The index of the first parameter. The receiver lies below the first | |
| 357 // parameter. | |
| 358 int param0_index() const { return 1; } | |
| 359 | |
| 360 // The index of the context slot in the frame. | |
| 361 int context_index() const { | |
| 362 ASSERT(frame_pointer_ != kIllegalIndex); | |
| 363 return frame_pointer_ - 1; | |
| 364 } | |
| 365 | |
| 366 // The index of the function slot in the frame. It lies above the context | |
| 367 // slot. | |
| 368 int function_index() const { | |
| 369 ASSERT(frame_pointer_ != kIllegalIndex); | |
| 370 return frame_pointer_ - 2; | |
| 371 } | |
| 372 | |
| 373 // The index of the first local. Between the parameters and the locals | |
| 374 // lie the return address, the saved frame pointer, the context, and the | |
| 375 // function. | |
| 376 int local0_index() const { | |
| 377 ASSERT(frame_pointer_ != kIllegalIndex); | |
| 378 return frame_pointer_ + 2; | |
| 379 } | |
| 380 | |
| 381 // The index of the base of the expression stack. | |
| 382 int expression_base_index() const { return local0_index() + local_count_; } | |
| 383 | |
| 384 // Convert a frame index into a frame pointer relative offset into the | |
| 385 // actual stack. | |
| 386 int fp_relative(int index) const { | |
| 387 return (frame_pointer_ - index) * kPointerSize; | |
| 388 } | |
| 389 | |
| 390 // Record an occurrence of a register in the virtual frame. This has the | |
| 391 // effect of incrementing the register's external reference count and | |
| 392 // of updating the index of the register's location in the frame. | |
| 393 void Use(Register reg, int index); | |
| 394 | |
| 395 // Record that a register reference has been dropped from the frame. This | |
| 396 // decrements the register's external reference count and invalidates the | |
| 397 // index of the register's location in the frame. | |
| 398 void Unuse(Register reg); | |
| 399 | |
| 400 // Spill the element at a particular index---write it to memory if | |
| 401 // necessary, free any associated register, and forget its value if | |
| 402 // constant. | |
| 403 void SpillElementAt(int index); | |
| 404 | |
| 405 // Sync the element at a particular index. If it is a register or | |
| 406 // constant that disagrees with the value on the stack, write it to memory. | |
| 407 // Keep the element type as register or constant, and clear the dirty bit. | |
| 408 void SyncElementAt(int index); | |
| 409 | |
| 410 // Sync the range of elements in [begin, end). | |
| 411 void SyncRange(int begin, int end); | |
| 412 | |
| 413 // Sync a single unsynced element that lies beneath or at the stack pointer. | |
| 414 void SyncElementBelowStackPointer(int index); | |
| 415 | |
| 416 // Sync a single unsynced element that lies just above the stack pointer. | |
| 417 void SyncElementByPushing(int index); | |
| 418 | |
| 419 // Push a copy of a frame slot (typically a local or parameter) on top of | |
| 420 // the frame. | |
| 421 void PushFrameSlotAt(int index); | |
| 422 | |
| 423 // Push a the value of a frame slot (typically a local or parameter) on | |
| 424 // top of the frame and invalidate the slot. | |
| 425 void TakeFrameSlotAt(int index); | |
| 426 | |
| 427 // Store the value on top of the frame to a frame slot (typically a local | |
| 428 // or parameter). | |
| 429 void StoreToFrameSlotAt(int index); | |
| 430 | |
| 431 // Spill all elements in registers. Spill the top spilled_args elements | |
| 432 // on the frame. Sync all other frame elements. | |
| 433 // Then drop dropped_args elements from the virtual frame, to match | |
| 434 // the effect of an upcoming call that will drop them from the stack. | |
| 435 void PrepareForCall(int spilled_args, int dropped_args); | |
| 436 | |
| 437 // Move frame elements currently in registers or constants, that | |
| 438 // should be in memory in the expected frame, to memory. | |
| 439 void MergeMoveRegistersToMemory(VirtualFrame* expected); | |
| 440 | |
| 441 // Make the register-to-register moves necessary to | |
| 442 // merge this frame with the expected frame. | |
| 443 // Register to memory moves must already have been made, | |
| 444 // and memory to register moves must follow this call. | |
| 445 // This is because some new memory-to-register moves are | |
| 446 // created in order to break cycles of register moves. | |
| 447 // Used in the implementation of MergeTo(). | |
| 448 void MergeMoveRegistersToRegisters(VirtualFrame* expected); | |
| 449 | |
| 450 // Make the memory-to-register and constant-to-register moves | |
| 451 // needed to make this frame equal the expected frame. | |
| 452 // Called after all register-to-memory and register-to-register | |
| 453 // moves have been made. After this function returns, the frames | |
| 454 // should be equal. | |
| 455 void MergeMoveMemoryToRegisters(VirtualFrame* expected); | |
| 456 | |
| 457 // Invalidates a frame slot (puts an invalid frame element in it). | |
| 458 // Copies on the frame are correctly handled, and if this slot was | |
| 459 // the backing store of copies, the index of the new backing store | |
| 460 // is returned. Otherwise, returns kIllegalIndex. | |
| 461 // Register counts are correctly updated. | |
| 462 int InvalidateFrameSlotAt(int index); | |
| 463 | |
| 464 // Call a code stub that has already been prepared for calling (via | |
| 465 // PrepareForCall). | |
| 466 Result RawCallStub(CodeStub* stub); | |
| 467 | |
| 468 // Calls a code object which has already been prepared for calling | |
| 469 // (via PrepareForCall). | |
| 470 Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode); | |
| 471 | |
| 472 bool Equals(VirtualFrame* other); | |
| 473 | |
| 474 friend class JumpTarget; | |
| 475 }; | |
| 476 | |
| 477 | |
| 478 } } // namespace v8::internal | |
| 479 | |
| 480 #endif // V8_VIRTUAL_FRAME_ARM_H_ | |
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Chromium Code Reviews
Issue 92068:
Move backend specific files to separate directories. (Closed)
