ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +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_VIRTUAL_FRAME_IA32_H_ |
| 29 | #define V8_VIRTUAL_FRAME_IA32_H_ |
| 30 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 31 | #include "register-allocator.h" |
| 32 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 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 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 62 | // An illegal index into the virtual frame. |
| 63 | static const int kIllegalIndex = -1; |
| 64 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 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 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 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()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 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 count elements from the top of the frame all in-memory |
| 97 | // (including synced) and adjust the stack pointer downward, to |
| 98 | // match an external frame effect (examples include a call removing |
| 99 | // its arguments, and exiting a try/catch removing an exception |
| 100 | // handler). No code will be emitted. |
| 101 | void Forget(int count); |
| 102 | |
| 103 | // Forget count elements from the top of the frame without adjusting |
| 104 | // the stack pointer downward. This is used, for example, before |
| 105 | // merging frames at break, continue, and return targets. |
| 106 | void ForgetElements(int count); |
| 107 | |
| 108 | // Spill all values from the frame to memory. |
| 109 | void SpillAll(); |
| 110 | |
| 111 | // Spill all occurrences of a specific register from the frame. |
| 112 | void Spill(Register reg); |
| 113 | |
| 114 | // Spill all occurrences of an arbitrary register if possible. Return the |
| 115 | // register spilled or no_reg if it was not possible to free any register |
| 116 | // (ie, they all have frame-external references). |
| 117 | Register SpillAnyRegister(); |
| 118 | |
| 119 | // Prepare this virtual frame for merging to an expected frame by |
| 120 | // performing some state changes that do not require generating |
| 121 | // code. It is guaranteed that no code will be generated. |
| 122 | void PrepareMergeTo(VirtualFrame* expected); |
| 123 | |
| 124 | // Make this virtual frame have a state identical to an expected virtual |
| 125 | // frame. As a side effect, code may be emitted to make this frame match |
| 126 | // the expected one. |
| 127 | void MergeTo(VirtualFrame* expected); |
| 128 | |
| 129 | // Detach a frame from its code generator, perhaps temporarily. This |
| 130 | // tells the register allocator that it is free to use frame-internal |
| 131 | // registers. Used when the code generator's frame is switched from this |
| 132 | // one to NULL by an unconditional jump. |
| 133 | void DetachFromCodeGenerator(); |
| 134 | |
| 135 | // (Re)attach a frame to its code generator. This informs the register |
| 136 | // allocator that the frame-internal register references are active again. |
| 137 | // Used when a code generator's frame is switched from NULL to this one by |
| 138 | // binding a label. |
| 139 | void AttachToCodeGenerator(); |
| 140 | |
| 141 | // Emit code for the physical JS entry and exit frame sequences. After |
| 142 | // calling Enter, the virtual frame is ready for use; and after calling |
| 143 | // Exit it should not be used. Note that Enter does not allocate space in |
| 144 | // the physical frame for storing frame-allocated locals. |
| 145 | void Enter(); |
| 146 | void Exit(); |
| 147 | |
| 148 | // Prepare for returning from the frame by spilling locals. This |
| 149 | // avoids generating unnecessary merge code when jumping to the |
| 150 | // shared return site. Emits code for spills. |
| 151 | void PrepareForReturn(); |
| 152 | |
| 153 | // Allocate and initialize the frame-allocated locals. |
| 154 | void AllocateStackSlots(int count); |
| 155 | |
| 156 | // An element of the expression stack as an assembly operand. |
| 157 | Operand ElementAt(int index) const { |
| 158 | return Operand(esp, index * kPointerSize); |
| 159 | } |
| 160 | |
| 161 | // Random-access store to a frame-top relative frame element. The result |
| 162 | // becomes owned by the frame and is invalidated. |
| 163 | void SetElementAt(int index, Result* value); |
| 164 | |
| 165 | // Set a frame element to a constant. The index is frame-top relative. |
| 166 | void SetElementAt(int index, Handle<Object> value) { |
| 167 | Result temp(value, cgen_); |
| 168 | SetElementAt(index, &temp); |
| 169 | } |
| 170 | |
| 171 | void PushElementAt(int index) { |
| 172 | PushFrameSlotAt(elements_.length() - index - 1); |
| 173 | } |
| 174 | |
kasperl@chromium.org | 8ccb0be | 2009-04-07 07:21:39 +0000 | [diff] [blame] | 175 | void StoreToElementAt(int index) { |
| 176 | StoreToFrameSlotAt(elements_.length() - index - 1); |
| 177 | } |
| 178 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 179 | // A frame-allocated local as an assembly operand. |
| 180 | Operand LocalAt(int index) const { |
| 181 | ASSERT(0 <= index); |
| 182 | ASSERT(index < local_count_); |
| 183 | return Operand(ebp, kLocal0Offset - index * kPointerSize); |
| 184 | } |
| 185 | |
| 186 | // Push a copy of the value of a local frame slot on top of the frame. |
| 187 | void PushLocalAt(int index) { |
| 188 | PushFrameSlotAt(local0_index() + index); |
| 189 | } |
| 190 | |
| 191 | // Push the value of a local frame slot on top of the frame and invalidate |
| 192 | // the local slot. The slot should be written to before trying to read |
| 193 | // from it again. |
| 194 | void TakeLocalAt(int index) { |
| 195 | TakeFrameSlotAt(local0_index() + index); |
| 196 | } |
| 197 | |
| 198 | // Store the top value on the virtual frame into a local frame slot. The |
| 199 | // value is left in place on top of the frame. |
| 200 | void StoreToLocalAt(int index) { |
| 201 | StoreToFrameSlotAt(local0_index() + index); |
| 202 | } |
| 203 | |
| 204 | // Push the address of the receiver slot on the frame. |
| 205 | void PushReceiverSlotAddress(); |
| 206 | |
| 207 | // Push the function on top of the frame. |
| 208 | void PushFunction() { PushFrameSlotAt(function_index()); } |
| 209 | |
| 210 | // Save the value of the esi register to the context frame slot. |
| 211 | void SaveContextRegister(); |
| 212 | |
| 213 | // Restore the esi register from the value of the context frame |
| 214 | // slot. |
| 215 | void RestoreContextRegister(); |
| 216 | |
| 217 | // A parameter as an assembly operand. |
| 218 | Operand ParameterAt(int index) const { |
| 219 | ASSERT(-1 <= index); // -1 is the receiver. |
| 220 | ASSERT(index < parameter_count_); |
| 221 | return Operand(ebp, (1 + parameter_count_ - index) * kPointerSize); |
| 222 | } |
| 223 | |
| 224 | // Push a copy of the value of a parameter frame slot on top of the frame. |
| 225 | void PushParameterAt(int index) { |
| 226 | PushFrameSlotAt(param0_index() + index); |
| 227 | } |
| 228 | |
| 229 | // Push the value of a paramter frame slot on top of the frame and |
| 230 | // invalidate the parameter slot. The slot should be written to before |
| 231 | // trying to read from it again. |
| 232 | void TakeParameterAt(int index) { |
| 233 | TakeFrameSlotAt(param0_index() + index); |
| 234 | } |
| 235 | |
| 236 | // Store the top value on the virtual frame into a parameter frame slot. |
| 237 | // The value is left in place on top of the frame. |
| 238 | void StoreToParameterAt(int index) { |
| 239 | StoreToFrameSlotAt(param0_index() + index); |
| 240 | } |
| 241 | |
| 242 | // The receiver frame slot. |
| 243 | Operand Receiver() const { return ParameterAt(-1); } |
| 244 | |
| 245 | // Push a try-catch or try-finally handler on top of the virtual frame. |
| 246 | void PushTryHandler(HandlerType type); |
| 247 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 248 | // Call stub given the number of arguments it expects on (and |
| 249 | // removes from) the stack. |
| 250 | Result CallStub(CodeStub* stub, int arg_count); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 251 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 252 | // Call stub that takes a single argument passed in eax. The |
| 253 | // argument is given as a result which does not have to be eax or |
| 254 | // even a register. The argument is consumed by the call. |
| 255 | Result CallStub(CodeStub* stub, Result* arg); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 256 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 257 | // Call stub that takes a pair of arguments passed in edx (arg0) and |
| 258 | // eax (arg1). The arguments are given as results which do not have |
| 259 | // to be in the proper registers or even in registers. The |
| 260 | // arguments are consumed by the call. |
| 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. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 270 | Result InvokeBuiltin(Builtins::JavaScript id, |
| 271 | InvokeFlag flag, |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 272 | int arg_count); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 273 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 274 | // Call load IC. Name and receiver are found on top of the frame. |
| 275 | // Receiver is not dropped. |
| 276 | Result CallLoadIC(RelocInfo::Mode mode); |
| 277 | |
| 278 | // Call keyed load IC. Key and receiver are found on top of the |
| 279 | // frame. They are not dropped. |
| 280 | Result CallKeyedLoadIC(RelocInfo::Mode mode); |
| 281 | |
| 282 | // Call store IC. Name, value, and receiver are found on top of the |
| 283 | // frame. Receiver is not dropped. |
| 284 | Result CallStoreIC(); |
| 285 | |
| 286 | // Call keyed store IC. Value, key, and receiver are found on top |
| 287 | // of the frame. Key and receiver are not dropped. |
| 288 | Result CallKeyedStoreIC(); |
| 289 | |
| 290 | // Call call IC. Arguments, reciever, and function name are found |
| 291 | // on top of the frame. Function name slot is not dropped. The |
| 292 | // argument count does not include the receiver. |
| 293 | Result CallCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting); |
| 294 | |
| 295 | // Allocate and call JS function as constructor. Arguments, |
| 296 | // receiver (global object), and function are found on top of the |
| 297 | // frame. Function is not dropped. The argument count does not |
| 298 | // include the receiver. |
| 299 | Result CallConstructor(int arg_count); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 300 | |
| 301 | // Drop a number of elements from the top of the expression stack. May |
| 302 | // emit code to affect the physical frame. Does not clobber any registers |
| 303 | // excepting possibly the stack pointer. |
| 304 | void Drop(int count); |
| 305 | |
| 306 | // Drop one element. |
| 307 | void Drop() { Drop(1); } |
| 308 | |
| 309 | // Duplicate the top element of the frame. |
| 310 | void Dup() { PushFrameSlotAt(elements_.length() - 1); } |
| 311 | |
| 312 | // Pop an element from the top of the expression stack. Returns a |
| 313 | // Result, which may be a constant or a register. |
| 314 | Result Pop(); |
| 315 | |
| 316 | // Pop and save an element from the top of the expression stack and |
| 317 | // emit a corresponding pop instruction. |
| 318 | void EmitPop(Register reg); |
| 319 | void EmitPop(Operand operand); |
| 320 | |
| 321 | // Push an element on top of the expression stack and emit a |
| 322 | // corresponding push instruction. |
| 323 | void EmitPush(Register reg); |
| 324 | void EmitPush(Operand operand); |
| 325 | void EmitPush(Immediate immediate); |
| 326 | |
| 327 | // Push an element on the virtual frame. |
kasperl@chromium.org | 8ccb0be | 2009-04-07 07:21:39 +0000 | [diff] [blame] | 328 | void Push(Register reg, StaticType static_type = StaticType()); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 329 | void Push(Handle<Object> value); |
| 330 | void Push(Smi* value) { Push(Handle<Object>(value)); } |
| 331 | |
| 332 | // Pushing a result invalidates it (its contents become owned by the |
| 333 | // frame). |
| 334 | void Push(Result* result); |
| 335 | |
| 336 | // Nip removes zero or more elements from immediately below the top |
| 337 | // of the frame, leaving the previous top-of-frame value on top of |
| 338 | // the frame. Nip(k) is equivalent to x = Pop(), Drop(k), Push(x). |
| 339 | void Nip(int num_dropped); |
| 340 | |
| 341 | private: |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 342 | static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset; |
| 343 | static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset; |
| 344 | static const int kContextOffset = StandardFrameConstants::kContextOffset; |
| 345 | |
| 346 | static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize; |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 347 | static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 348 | |
| 349 | CodeGenerator* cgen_; |
| 350 | MacroAssembler* masm_; |
| 351 | |
| 352 | List<FrameElement> elements_; |
| 353 | |
| 354 | // The number of frame-allocated locals and parameters respectively. |
| 355 | int parameter_count_; |
| 356 | int local_count_; |
| 357 | |
| 358 | // The index of the element that is at the processor's stack pointer |
| 359 | // (the esp register). |
| 360 | int stack_pointer_; |
| 361 | |
| 362 | // The index of the element that is at the processor's frame pointer |
| 363 | // (the ebp register). |
| 364 | int frame_pointer_; |
| 365 | |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 366 | // The index of the register frame element using each register, or |
| 367 | // kIllegalIndex if a register is not on the frame. |
| 368 | int register_locations_[kNumRegisters]; |
| 369 | |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 370 | // The index of the first parameter. The receiver lies below the first |
| 371 | // parameter. |
| 372 | int param0_index() const { return 1; } |
| 373 | |
| 374 | // The index of the context slot in the frame. |
| 375 | int context_index() const { |
| 376 | ASSERT(frame_pointer_ != kIllegalIndex); |
| 377 | return frame_pointer_ + 1; |
| 378 | } |
| 379 | |
| 380 | // The index of the function slot in the frame. It lies above the context |
| 381 | // slot. |
| 382 | int function_index() const { |
| 383 | ASSERT(frame_pointer_ != kIllegalIndex); |
| 384 | return frame_pointer_ + 2; |
| 385 | } |
| 386 | |
| 387 | // The index of the first local. Between the parameters and the locals |
| 388 | // lie the return address, the saved frame pointer, the context, and the |
| 389 | // function. |
| 390 | int local0_index() const { |
| 391 | ASSERT(frame_pointer_ != kIllegalIndex); |
| 392 | return frame_pointer_ + 3; |
| 393 | } |
| 394 | |
| 395 | // The index of the base of the expression stack. |
| 396 | int expression_base_index() const { return local0_index() + local_count_; } |
| 397 | |
| 398 | // Convert a frame index into a frame pointer relative offset into the |
| 399 | // actual stack. |
| 400 | int fp_relative(int index) const { |
| 401 | return (frame_pointer_ - index) * kPointerSize; |
| 402 | } |
| 403 | |
| 404 | // Record an occurrence of a register in the virtual frame. This has the |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 405 | // effect of incrementing the register's external reference count and |
| 406 | // of updating the index of the register's location in the frame. |
| 407 | void Use(Register reg, int index); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 408 | |
| 409 | // Record that a register reference has been dropped from the frame. This |
kasperl@chromium.org | f5aa837 | 2009-03-24 14:47:14 +0000 | [diff] [blame] | 410 | // decrements the register's external reference count and invalidates the |
| 411 | // index of the register's location in the frame. |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 412 | void Unuse(Register reg); |
| 413 | |
| 414 | // Spill the element at a particular index---write it to memory if |
| 415 | // necessary, free any associated register, and forget its value if |
| 416 | // constant. |
| 417 | void SpillElementAt(int index); |
| 418 | |
| 419 | // Sync the element at a particular index. If it is a register or |
| 420 | // constant that disagrees with the value on the stack, write it to memory. |
| 421 | // Keep the element type as register or constant, and clear the dirty bit. |
| 422 | void SyncElementAt(int index); |
| 423 | |
| 424 | // Sync the range of elements in [begin, end). |
| 425 | void SyncRange(int begin, int end); |
| 426 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 427 | // Sync a single unsynced element that lies beneath or at the stack pointer. |
| 428 | void SyncElementBelowStackPointer(int index); |
| 429 | |
| 430 | // Sync a single unsynced element that lies just above the stack pointer. |
| 431 | void SyncElementByPushing(int index); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 432 | |
| 433 | // Push a copy of a frame slot (typically a local or parameter) on top of |
| 434 | // the frame. |
| 435 | void PushFrameSlotAt(int index); |
| 436 | |
| 437 | // Push a the value of a frame slot (typically a local or parameter) on |
| 438 | // top of the frame and invalidate the slot. |
| 439 | void TakeFrameSlotAt(int index); |
| 440 | |
| 441 | // Store the value on top of the frame to a frame slot (typically a local |
| 442 | // or parameter). |
| 443 | void StoreToFrameSlotAt(int index); |
| 444 | |
| 445 | // Spill all elements in registers. Spill the top spilled_args elements |
| 446 | // on the frame. Sync all other frame elements. |
| 447 | // Then drop dropped_args elements from the virtual frame, to match |
| 448 | // the effect of an upcoming call that will drop them from the stack. |
| 449 | void PrepareForCall(int spilled_args, int dropped_args); |
| 450 | |
| 451 | // Move frame elements currently in registers or constants, that |
| 452 | // should be in memory in the expected frame, to memory. |
| 453 | void MergeMoveRegistersToMemory(VirtualFrame* expected); |
| 454 | |
| 455 | // Make the register-to-register moves necessary to |
| 456 | // merge this frame with the expected frame. |
| 457 | // Register to memory moves must already have been made, |
| 458 | // and memory to register moves must follow this call. |
| 459 | // This is because some new memory-to-register moves are |
| 460 | // created in order to break cycles of register moves. |
| 461 | // Used in the implementation of MergeTo(). |
| 462 | void MergeMoveRegistersToRegisters(VirtualFrame* expected); |
| 463 | |
| 464 | // Make the memory-to-register and constant-to-register moves |
| 465 | // needed to make this frame equal the expected frame. |
| 466 | // Called after all register-to-memory and register-to-register |
| 467 | // moves have been made. After this function returns, the frames |
| 468 | // should be equal. |
| 469 | void MergeMoveMemoryToRegisters(VirtualFrame* expected); |
| 470 | |
ager@chromium.org | bb29dc9 | 2009-03-24 13:25:23 +0000 | [diff] [blame] | 471 | // Invalidates a frame slot (puts an invalid frame element in it). |
| 472 | // Copies on the frame are correctly handled, and if this slot was |
| 473 | // the backing store of copies, the index of the new backing store |
| 474 | // is returned. Otherwise, returns kIllegalIndex. |
| 475 | // Register counts are correctly updated. |
| 476 | int InvalidateFrameSlotAt(int index); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 477 | |
| 478 | // Call a code stub that has already been prepared for calling (via |
| 479 | // PrepareForCall). |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 480 | Result RawCallStub(CodeStub* stub); |
kasperl@chromium.org | 7be3c99 | 2009-03-12 07:19:55 +0000 | [diff] [blame] | 481 | |
| 482 | // Calls a code object which has already been prepared for calling |
| 483 | // (via PrepareForCall). |
| 484 | Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode); |
| 485 | |
| 486 | bool Equals(VirtualFrame* other); |
| 487 | |
| 488 | friend class JumpTarget; |
| 489 | }; |
| 490 | |
| 491 | } } // namespace v8::internal |
| 492 | |
| 493 | #endif // V8_VIRTUAL_FRAME_IA32_H_ |