1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_ 6 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_ 7 8 #include "src/assembler.h" 9 #include "src/frames.h" 10 #include "src/globals.h" 11 12 namespace v8 { 13 namespace internal { 14 15 // Convenience for platform-independent signatures. We do not normally 16 // distinguish memory operands from other operands on ia32. 17 typedef Operand MemOperand; 18 19 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET }; 20 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK }; 21 enum PointersToHereCheck { 22 kPointersToHereMaybeInteresting, 23 kPointersToHereAreAlwaysInteresting 24 }; 25 26 27 enum RegisterValueType { 28 REGISTER_VALUE_IS_SMI, 29 REGISTER_VALUE_IS_INT32 30 }; 31 32 33 bool AreAliased(Register r1, Register r2, Register r3, Register r4); 34 35 36 // MacroAssembler implements a collection of frequently used macros. 37 class MacroAssembler: public Assembler { 38 public: 39 // The isolate parameter can be NULL if the macro assembler should 40 // not use isolate-dependent functionality. In this case, it's the 41 // responsibility of the caller to never invoke such function on the 42 // macro assembler. 43 MacroAssembler(Isolate* isolate, void* buffer, int size); 44 45 void Load(Register dst, const Operand& src, Representation r); 46 void Store(Register src, const Operand& dst, Representation r); 47 48 // Operations on roots in the root-array. 49 void LoadRoot(Register destination, Heap::RootListIndex index); 50 void StoreRoot(Register source, Register scratch, Heap::RootListIndex index); 51 void CompareRoot(Register with, Register scratch, Heap::RootListIndex index); 52 // These methods can only be used with constant roots (i.e. non-writable 53 // and not in new space). 54 void CompareRoot(Register with, Heap::RootListIndex index); 55 void CompareRoot(const Operand& with, Heap::RootListIndex index); 56 57 // --------------------------------------------------------------------------- 58 // GC Support 59 enum RememberedSetFinalAction { 60 kReturnAtEnd, 61 kFallThroughAtEnd 62 }; 63 64 // Record in the remembered set the fact that we have a pointer to new space 65 // at the address pointed to by the addr register. Only works if addr is not 66 // in new space. 67 void RememberedSetHelper(Register object, // Used for debug code. 68 Register addr, 69 Register scratch, 70 SaveFPRegsMode save_fp, 71 RememberedSetFinalAction and_then); 72 73 void CheckPageFlag(Register object, 74 Register scratch, 75 int mask, 76 Condition cc, 77 Label* condition_met, 78 Label::Distance condition_met_distance = Label::kFar); 79 80 void CheckPageFlagForMap( 81 Handle<Map> map, 82 int mask, 83 Condition cc, 84 Label* condition_met, 85 Label::Distance condition_met_distance = Label::kFar); 86 87 void CheckMapDeprecated(Handle<Map> map, 88 Register scratch, 89 Label* if_deprecated); 90 91 // Check if object is in new space. Jumps if the object is not in new space. 92 // The register scratch can be object itself, but scratch will be clobbered. 93 void JumpIfNotInNewSpace(Register object, 94 Register scratch, 95 Label* branch, 96 Label::Distance distance = Label::kFar) { 97 InNewSpace(object, scratch, zero, branch, distance); 98 } 99 100 // Check if object is in new space. Jumps if the object is in new space. 101 // The register scratch can be object itself, but it will be clobbered. 102 void JumpIfInNewSpace(Register object, 103 Register scratch, 104 Label* branch, 105 Label::Distance distance = Label::kFar) { 106 InNewSpace(object, scratch, not_zero, branch, distance); 107 } 108 109 // Check if an object has a given incremental marking color. Also uses ecx! 110 void HasColor(Register object, 111 Register scratch0, 112 Register scratch1, 113 Label* has_color, 114 Label::Distance has_color_distance, 115 int first_bit, 116 int second_bit); 117 118 void JumpIfBlack(Register object, 119 Register scratch0, 120 Register scratch1, 121 Label* on_black, 122 Label::Distance on_black_distance = Label::kFar); 123 124 // Checks the color of an object. If the object is already grey or black 125 // then we just fall through, since it is already live. If it is white and 126 // we can determine that it doesn't need to be scanned, then we just mark it 127 // black and fall through. For the rest we jump to the label so the 128 // incremental marker can fix its assumptions. 129 void EnsureNotWhite(Register object, 130 Register scratch1, 131 Register scratch2, 132 Label* object_is_white_and_not_data, 133 Label::Distance distance); 134 135 // Notify the garbage collector that we wrote a pointer into an object. 136 // |object| is the object being stored into, |value| is the object being 137 // stored. value and scratch registers are clobbered by the operation. 138 // The offset is the offset from the start of the object, not the offset from 139 // the tagged HeapObject pointer. For use with FieldOperand(reg, off). 140 void RecordWriteField( 141 Register object, 142 int offset, 143 Register value, 144 Register scratch, 145 SaveFPRegsMode save_fp, 146 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 147 SmiCheck smi_check = INLINE_SMI_CHECK, 148 PointersToHereCheck pointers_to_here_check_for_value = 149 kPointersToHereMaybeInteresting); 150 151 // As above, but the offset has the tag presubtracted. For use with 152 // Operand(reg, off). 153 void RecordWriteContextSlot( 154 Register context, 155 int offset, 156 Register value, 157 Register scratch, 158 SaveFPRegsMode save_fp, 159 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 160 SmiCheck smi_check = INLINE_SMI_CHECK, 161 PointersToHereCheck pointers_to_here_check_for_value = 162 kPointersToHereMaybeInteresting) { 163 RecordWriteField(context, 164 offset + kHeapObjectTag, 165 value, 166 scratch, 167 save_fp, 168 remembered_set_action, 169 smi_check, 170 pointers_to_here_check_for_value); 171 } 172 173 // Notify the garbage collector that we wrote a pointer into a fixed array. 174 // |array| is the array being stored into, |value| is the 175 // object being stored. |index| is the array index represented as a 176 // Smi. All registers are clobbered by the operation RecordWriteArray 177 // filters out smis so it does not update the write barrier if the 178 // value is a smi. 179 void RecordWriteArray( 180 Register array, 181 Register value, 182 Register index, 183 SaveFPRegsMode save_fp, 184 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 185 SmiCheck smi_check = INLINE_SMI_CHECK, 186 PointersToHereCheck pointers_to_here_check_for_value = 187 kPointersToHereMaybeInteresting); 188 189 // For page containing |object| mark region covering |address| 190 // dirty. |object| is the object being stored into, |value| is the 191 // object being stored. The address and value registers are clobbered by the 192 // operation. RecordWrite filters out smis so it does not update the 193 // write barrier if the value is a smi. 194 void RecordWrite( 195 Register object, 196 Register address, 197 Register value, 198 SaveFPRegsMode save_fp, 199 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 200 SmiCheck smi_check = INLINE_SMI_CHECK, 201 PointersToHereCheck pointers_to_here_check_for_value = 202 kPointersToHereMaybeInteresting); 203 204 // For page containing |object| mark the region covering the object's map 205 // dirty. |object| is the object being stored into, |map| is the Map object 206 // that was stored. 207 void RecordWriteForMap( 208 Register object, 209 Handle<Map> map, 210 Register scratch1, 211 Register scratch2, 212 SaveFPRegsMode save_fp); 213 214 // --------------------------------------------------------------------------- 215 // Debugger Support 216 217 void DebugBreak(); 218 219 // Generates function and stub prologue code. 220 void StubPrologue(); 221 void Prologue(bool code_pre_aging); 222 223 // Enter specific kind of exit frame. Expects the number of 224 // arguments in register eax and sets up the number of arguments in 225 // register edi and the pointer to the first argument in register 226 // esi. 227 void EnterExitFrame(bool save_doubles); 228 229 void EnterApiExitFrame(int argc); 230 231 // Leave the current exit frame. Expects the return value in 232 // register eax:edx (untouched) and the pointer to the first 233 // argument in register esi. 234 void LeaveExitFrame(bool save_doubles); 235 236 // Leave the current exit frame. Expects the return value in 237 // register eax (untouched). 238 void LeaveApiExitFrame(bool restore_context); 239 240 // Find the function context up the context chain. 241 void LoadContext(Register dst, int context_chain_length); 242 243 // Conditionally load the cached Array transitioned map of type 244 // transitioned_kind from the native context if the map in register 245 // map_in_out is the cached Array map in the native context of 246 // expected_kind. 247 void LoadTransitionedArrayMapConditional( 248 ElementsKind expected_kind, 249 ElementsKind transitioned_kind, 250 Register map_in_out, 251 Register scratch, 252 Label* no_map_match); 253 254 // Load the global function with the given index. 255 void LoadGlobalFunction(int index, Register function); 256 257 // Load the initial map from the global function. The registers 258 // function and map can be the same. 259 void LoadGlobalFunctionInitialMap(Register function, Register map); 260 261 // Push and pop the registers that can hold pointers. 262 void PushSafepointRegisters() { pushad(); } 263 void PopSafepointRegisters() { popad(); } 264 // Store the value in register/immediate src in the safepoint 265 // register stack slot for register dst. 266 void StoreToSafepointRegisterSlot(Register dst, Register src); 267 void StoreToSafepointRegisterSlot(Register dst, Immediate src); 268 void LoadFromSafepointRegisterSlot(Register dst, Register src); 269 270 void LoadHeapObject(Register result, Handle<HeapObject> object); 271 void CmpHeapObject(Register reg, Handle<HeapObject> object); 272 void PushHeapObject(Handle<HeapObject> object); 273 274 void LoadObject(Register result, Handle<Object> object) { 275 AllowDeferredHandleDereference heap_object_check; 276 if (object->IsHeapObject()) { 277 LoadHeapObject(result, Handle<HeapObject>::cast(object)); 278 } else { 279 Move(result, Immediate(object)); 280 } 281 } 282 283 void CmpObject(Register reg, Handle<Object> object) { 284 AllowDeferredHandleDereference heap_object_check; 285 if (object->IsHeapObject()) { 286 CmpHeapObject(reg, Handle<HeapObject>::cast(object)); 287 } else { 288 cmp(reg, Immediate(object)); 289 } 290 } 291 292 // --------------------------------------------------------------------------- 293 // JavaScript invokes 294 295 // Invoke the JavaScript function code by either calling or jumping. 296 void InvokeCode(Register code, 297 const ParameterCount& expected, 298 const ParameterCount& actual, 299 InvokeFlag flag, 300 const CallWrapper& call_wrapper) { 301 InvokeCode(Operand(code), expected, actual, flag, call_wrapper); 302 } 303 304 void InvokeCode(const Operand& code, 305 const ParameterCount& expected, 306 const ParameterCount& actual, 307 InvokeFlag flag, 308 const CallWrapper& call_wrapper); 309 310 // Invoke the JavaScript function in the given register. Changes the 311 // current context to the context in the function before invoking. 312 void InvokeFunction(Register function, 313 const ParameterCount& actual, 314 InvokeFlag flag, 315 const CallWrapper& call_wrapper); 316 317 void InvokeFunction(Register function, 318 const ParameterCount& expected, 319 const ParameterCount& actual, 320 InvokeFlag flag, 321 const CallWrapper& call_wrapper); 322 323 void InvokeFunction(Handle<JSFunction> function, 324 const ParameterCount& expected, 325 const ParameterCount& actual, 326 InvokeFlag flag, 327 const CallWrapper& call_wrapper); 328 329 // Invoke specified builtin JavaScript function. Adds an entry to 330 // the unresolved list if the name does not resolve. 331 void InvokeBuiltin(Builtins::JavaScript id, 332 InvokeFlag flag, 333 const CallWrapper& call_wrapper = NullCallWrapper()); 334 335 // Store the function for the given builtin in the target register. 336 void GetBuiltinFunction(Register target, Builtins::JavaScript id); 337 338 // Store the code object for the given builtin in the target register. 339 void GetBuiltinEntry(Register target, Builtins::JavaScript id); 340 341 // Expression support 342 // cvtsi2sd instruction only writes to the low 64-bit of dst register, which 343 // hinders register renaming and makes dependence chains longer. So we use 344 // xorps to clear the dst register before cvtsi2sd to solve this issue. 345 void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); } 346 void Cvtsi2sd(XMMRegister dst, const Operand& src); 347 348 // Support for constant splitting. 349 bool IsUnsafeImmediate(const Immediate& x); 350 void SafeMove(Register dst, const Immediate& x); 351 void SafePush(const Immediate& x); 352 353 // Compare object type for heap object. 354 // Incoming register is heap_object and outgoing register is map. 355 void CmpObjectType(Register heap_object, InstanceType type, Register map); 356 357 // Compare instance type for map. 358 void CmpInstanceType(Register map, InstanceType type); 359 360 // Check if a map for a JSObject indicates that the object has fast elements. 361 // Jump to the specified label if it does not. 362 void CheckFastElements(Register map, 363 Label* fail, 364 Label::Distance distance = Label::kFar); 365 366 // Check if a map for a JSObject indicates that the object can have both smi 367 // and HeapObject elements. Jump to the specified label if it does not. 368 void CheckFastObjectElements(Register map, 369 Label* fail, 370 Label::Distance distance = Label::kFar); 371 372 // Check if a map for a JSObject indicates that the object has fast smi only 373 // elements. Jump to the specified label if it does not. 374 void CheckFastSmiElements(Register map, 375 Label* fail, 376 Label::Distance distance = Label::kFar); 377 378 // Check to see if maybe_number can be stored as a double in 379 // FastDoubleElements. If it can, store it at the index specified by key in 380 // the FastDoubleElements array elements, otherwise jump to fail. 381 void StoreNumberToDoubleElements(Register maybe_number, 382 Register elements, 383 Register key, 384 Register scratch1, 385 XMMRegister scratch2, 386 Label* fail, 387 int offset = 0); 388 389 // Compare an object's map with the specified map. 390 void CompareMap(Register obj, Handle<Map> map); 391 392 // Check if the map of an object is equal to a specified map and branch to 393 // label if not. Skip the smi check if not required (object is known to be a 394 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match 395 // against maps that are ElementsKind transition maps of the specified map. 396 void CheckMap(Register obj, 397 Handle<Map> map, 398 Label* fail, 399 SmiCheckType smi_check_type); 400 401 // Check if the map of an object is equal to a specified map and branch to a 402 // specified target if equal. Skip the smi check if not required (object is 403 // known to be a heap object) 404 void DispatchMap(Register obj, 405 Register unused, 406 Handle<Map> map, 407 Handle<Code> success, 408 SmiCheckType smi_check_type); 409 410 // Check if the object in register heap_object is a string. Afterwards the 411 // register map contains the object map and the register instance_type 412 // contains the instance_type. The registers map and instance_type can be the 413 // same in which case it contains the instance type afterwards. Either of the 414 // registers map and instance_type can be the same as heap_object. 415 Condition IsObjectStringType(Register heap_object, 416 Register map, 417 Register instance_type); 418 419 // Check if the object in register heap_object is a name. Afterwards the 420 // register map contains the object map and the register instance_type 421 // contains the instance_type. The registers map and instance_type can be the 422 // same in which case it contains the instance type afterwards. Either of the 423 // registers map and instance_type can be the same as heap_object. 424 Condition IsObjectNameType(Register heap_object, 425 Register map, 426 Register instance_type); 427 428 // Check if a heap object's type is in the JSObject range, not including 429 // JSFunction. The object's map will be loaded in the map register. 430 // Any or all of the three registers may be the same. 431 // The contents of the scratch register will always be overwritten. 432 void IsObjectJSObjectType(Register heap_object, 433 Register map, 434 Register scratch, 435 Label* fail); 436 437 // The contents of the scratch register will be overwritten. 438 void IsInstanceJSObjectType(Register map, Register scratch, Label* fail); 439 440 // FCmp is similar to integer cmp, but requires unsigned 441 // jcc instructions (je, ja, jae, jb, jbe, je, and jz). 442 void FCmp(); 443 444 void ClampUint8(Register reg); 445 446 void ClampDoubleToUint8(XMMRegister input_reg, 447 XMMRegister scratch_reg, 448 Register result_reg); 449 450 void SlowTruncateToI(Register result_reg, Register input_reg, 451 int offset = HeapNumber::kValueOffset - kHeapObjectTag); 452 453 void TruncateHeapNumberToI(Register result_reg, Register input_reg); 454 void TruncateDoubleToI(Register result_reg, XMMRegister input_reg); 455 456 void DoubleToI(Register result_reg, XMMRegister input_reg, 457 XMMRegister scratch, MinusZeroMode minus_zero_mode, 458 Label* conversion_failed, Label::Distance dst = Label::kFar); 459 460 void TaggedToI(Register result_reg, Register input_reg, XMMRegister temp, 461 MinusZeroMode minus_zero_mode, Label* lost_precision); 462 463 // Smi tagging support. 464 void SmiTag(Register reg) { 465 STATIC_ASSERT(kSmiTag == 0); 466 STATIC_ASSERT(kSmiTagSize == 1); 467 add(reg, reg); 468 } 469 void SmiUntag(Register reg) { 470 sar(reg, kSmiTagSize); 471 } 472 473 // Modifies the register even if it does not contain a Smi! 474 void SmiUntag(Register reg, Label* is_smi) { 475 STATIC_ASSERT(kSmiTagSize == 1); 476 sar(reg, kSmiTagSize); 477 STATIC_ASSERT(kSmiTag == 0); 478 j(not_carry, is_smi); 479 } 480 481 void LoadUint32(XMMRegister dst, Register src); 482 483 // Jump the register contains a smi. 484 inline void JumpIfSmi(Register value, 485 Label* smi_label, 486 Label::Distance distance = Label::kFar) { 487 test(value, Immediate(kSmiTagMask)); 488 j(zero, smi_label, distance); 489 } 490 // Jump if the operand is a smi. 491 inline void JumpIfSmi(Operand value, 492 Label* smi_label, 493 Label::Distance distance = Label::kFar) { 494 test(value, Immediate(kSmiTagMask)); 495 j(zero, smi_label, distance); 496 } 497 // Jump if register contain a non-smi. 498 inline void JumpIfNotSmi(Register value, 499 Label* not_smi_label, 500 Label::Distance distance = Label::kFar) { 501 test(value, Immediate(kSmiTagMask)); 502 j(not_zero, not_smi_label, distance); 503 } 504 505 void LoadInstanceDescriptors(Register map, Register descriptors); 506 void EnumLength(Register dst, Register map); 507 void NumberOfOwnDescriptors(Register dst, Register map); 508 509 template<typename Field> 510 void DecodeField(Register reg) { 511 static const int shift = Field::kShift; 512 static const int mask = Field::kMask >> Field::kShift; 513 if (shift != 0) { 514 sar(reg, shift); 515 } 516 and_(reg, Immediate(mask)); 517 } 518 519 template<typename Field> 520 void DecodeFieldToSmi(Register reg) { 521 static const int shift = Field::kShift; 522 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize; 523 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0); 524 STATIC_ASSERT(kSmiTag == 0); 525 if (shift < kSmiTagSize) { 526 shl(reg, kSmiTagSize - shift); 527 } else if (shift > kSmiTagSize) { 528 sar(reg, shift - kSmiTagSize); 529 } 530 and_(reg, Immediate(mask)); 531 } 532 533 void LoadPowerOf2(XMMRegister dst, Register scratch, int power); 534 535 // Abort execution if argument is not a number, enabled via --debug-code. 536 void AssertNumber(Register object); 537 538 // Abort execution if argument is not a smi, enabled via --debug-code. 539 void AssertSmi(Register object); 540 541 // Abort execution if argument is a smi, enabled via --debug-code. 542 void AssertNotSmi(Register object); 543 544 // Abort execution if argument is not a string, enabled via --debug-code. 545 void AssertString(Register object); 546 547 // Abort execution if argument is not a name, enabled via --debug-code. 548 void AssertName(Register object); 549 550 // Abort execution if argument is not undefined or an AllocationSite, enabled 551 // via --debug-code. 552 void AssertUndefinedOrAllocationSite(Register object); 553 554 // --------------------------------------------------------------------------- 555 // Exception handling 556 557 // Push a new try handler and link it into try handler chain. 558 void PushTryHandler(StackHandler::Kind kind, int handler_index); 559 560 // Unlink the stack handler on top of the stack from the try handler chain. 561 void PopTryHandler(); 562 563 // Throw to the top handler in the try hander chain. 564 void Throw(Register value); 565 566 // Throw past all JS frames to the top JS entry frame. 567 void ThrowUncatchable(Register value); 568 569 // --------------------------------------------------------------------------- 570 // Inline caching support 571 572 // Generate code for checking access rights - used for security checks 573 // on access to global objects across environments. The holder register 574 // is left untouched, but the scratch register is clobbered. 575 void CheckAccessGlobalProxy(Register holder_reg, 576 Register scratch1, 577 Register scratch2, 578 Label* miss); 579 580 void GetNumberHash(Register r0, Register scratch); 581 582 void LoadFromNumberDictionary(Label* miss, 583 Register elements, 584 Register key, 585 Register r0, 586 Register r1, 587 Register r2, 588 Register result); 589 590 591 // --------------------------------------------------------------------------- 592 // Allocation support 593 594 // Allocate an object in new space or old pointer space. If the given space 595 // is exhausted control continues at the gc_required label. The allocated 596 // object is returned in result and end of the new object is returned in 597 // result_end. The register scratch can be passed as no_reg in which case 598 // an additional object reference will be added to the reloc info. The 599 // returned pointers in result and result_end have not yet been tagged as 600 // heap objects. If result_contains_top_on_entry is true the content of 601 // result is known to be the allocation top on entry (could be result_end 602 // from a previous call). If result_contains_top_on_entry is true scratch 603 // should be no_reg as it is never used. 604 void Allocate(int object_size, 605 Register result, 606 Register result_end, 607 Register scratch, 608 Label* gc_required, 609 AllocationFlags flags); 610 611 void Allocate(int header_size, 612 ScaleFactor element_size, 613 Register element_count, 614 RegisterValueType element_count_type, 615 Register result, 616 Register result_end, 617 Register scratch, 618 Label* gc_required, 619 AllocationFlags flags); 620 621 void Allocate(Register object_size, 622 Register result, 623 Register result_end, 624 Register scratch, 625 Label* gc_required, 626 AllocationFlags flags); 627 628 // Undo allocation in new space. The object passed and objects allocated after 629 // it will no longer be allocated. Make sure that no pointers are left to the 630 // object(s) no longer allocated as they would be invalid when allocation is 631 // un-done. 632 void UndoAllocationInNewSpace(Register object); 633 634 // Allocate a heap number in new space with undefined value. The 635 // register scratch2 can be passed as no_reg; the others must be 636 // valid registers. Returns tagged pointer in result register, or 637 // jumps to gc_required if new space is full. 638 void AllocateHeapNumber(Register result, 639 Register scratch1, 640 Register scratch2, 641 Label* gc_required); 642 643 // Allocate a sequential string. All the header fields of the string object 644 // are initialized. 645 void AllocateTwoByteString(Register result, 646 Register length, 647 Register scratch1, 648 Register scratch2, 649 Register scratch3, 650 Label* gc_required); 651 void AllocateAsciiString(Register result, 652 Register length, 653 Register scratch1, 654 Register scratch2, 655 Register scratch3, 656 Label* gc_required); 657 void AllocateAsciiString(Register result, 658 int length, 659 Register scratch1, 660 Register scratch2, 661 Label* gc_required); 662 663 // Allocate a raw cons string object. Only the map field of the result is 664 // initialized. 665 void AllocateTwoByteConsString(Register result, 666 Register scratch1, 667 Register scratch2, 668 Label* gc_required); 669 void AllocateAsciiConsString(Register result, 670 Register scratch1, 671 Register scratch2, 672 Label* gc_required); 673 674 // Allocate a raw sliced string object. Only the map field of the result is 675 // initialized. 676 void AllocateTwoByteSlicedString(Register result, 677 Register scratch1, 678 Register scratch2, 679 Label* gc_required); 680 void AllocateAsciiSlicedString(Register result, 681 Register scratch1, 682 Register scratch2, 683 Label* gc_required); 684 685 // Copy memory, byte-by-byte, from source to destination. Not optimized for 686 // long or aligned copies. 687 // The contents of index and scratch are destroyed. 688 void CopyBytes(Register source, 689 Register destination, 690 Register length, 691 Register scratch); 692 693 // Initialize fields with filler values. Fields starting at |start_offset| 694 // not including end_offset are overwritten with the value in |filler|. At 695 // the end the loop, |start_offset| takes the value of |end_offset|. 696 void InitializeFieldsWithFiller(Register start_offset, 697 Register end_offset, 698 Register filler); 699 700 // --------------------------------------------------------------------------- 701 // Support functions. 702 703 // Check a boolean-bit of a Smi field. 704 void BooleanBitTest(Register object, int field_offset, int bit_index); 705 706 // Check if result is zero and op is negative. 707 void NegativeZeroTest(Register result, Register op, Label* then_label); 708 709 // Check if result is zero and any of op1 and op2 are negative. 710 // Register scratch is destroyed, and it must be different from op2. 711 void NegativeZeroTest(Register result, Register op1, Register op2, 712 Register scratch, Label* then_label); 713 714 // Try to get function prototype of a function and puts the value in 715 // the result register. Checks that the function really is a 716 // function and jumps to the miss label if the fast checks fail. The 717 // function register will be untouched; the other registers may be 718 // clobbered. 719 void TryGetFunctionPrototype(Register function, 720 Register result, 721 Register scratch, 722 Label* miss, 723 bool miss_on_bound_function = false); 724 725 // Picks out an array index from the hash field. 726 // Register use: 727 // hash - holds the index's hash. Clobbered. 728 // index - holds the overwritten index on exit. 729 void IndexFromHash(Register hash, Register index); 730 731 // --------------------------------------------------------------------------- 732 // Runtime calls 733 734 // Call a code stub. Generate the code if necessary. 735 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None()); 736 737 // Tail call a code stub (jump). Generate the code if necessary. 738 void TailCallStub(CodeStub* stub); 739 740 // Return from a code stub after popping its arguments. 741 void StubReturn(int argc); 742 743 // Call a runtime routine. 744 void CallRuntime(const Runtime::Function* f, 745 int num_arguments, 746 SaveFPRegsMode save_doubles = kDontSaveFPRegs); 747 void CallRuntimeSaveDoubles(Runtime::FunctionId id) { 748 const Runtime::Function* function = Runtime::FunctionForId(id); 749 CallRuntime(function, function->nargs, kSaveFPRegs); 750 } 751 752 // Convenience function: Same as above, but takes the fid instead. 753 void CallRuntime(Runtime::FunctionId id, 754 int num_arguments, 755 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 756 CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles); 757 } 758 759 // Convenience function: call an external reference. 760 void CallExternalReference(ExternalReference ref, int num_arguments); 761 762 // Tail call of a runtime routine (jump). 763 // Like JumpToExternalReference, but also takes care of passing the number 764 // of parameters. 765 void TailCallExternalReference(const ExternalReference& ext, 766 int num_arguments, 767 int result_size); 768 769 // Convenience function: tail call a runtime routine (jump). 770 void TailCallRuntime(Runtime::FunctionId fid, 771 int num_arguments, 772 int result_size); 773 774 // Before calling a C-function from generated code, align arguments on stack. 775 // After aligning the frame, arguments must be stored in esp[0], esp[4], 776 // etc., not pushed. The argument count assumes all arguments are word sized. 777 // Some compilers/platforms require the stack to be aligned when calling 778 // C++ code. 779 // Needs a scratch register to do some arithmetic. This register will be 780 // trashed. 781 void PrepareCallCFunction(int num_arguments, Register scratch); 782 783 // Calls a C function and cleans up the space for arguments allocated 784 // by PrepareCallCFunction. The called function is not allowed to trigger a 785 // garbage collection, since that might move the code and invalidate the 786 // return address (unless this is somehow accounted for by the called 787 // function). 788 void CallCFunction(ExternalReference function, int num_arguments); 789 void CallCFunction(Register function, int num_arguments); 790 791 // Prepares stack to put arguments (aligns and so on). Reserves 792 // space for return value if needed (assumes the return value is a handle). 793 // Arguments must be stored in ApiParameterOperand(0), ApiParameterOperand(1) 794 // etc. Saves context (esi). If space was reserved for return value then 795 // stores the pointer to the reserved slot into esi. 796 void PrepareCallApiFunction(int argc); 797 798 // Calls an API function. Allocates HandleScope, extracts returned value 799 // from handle and propagates exceptions. Clobbers ebx, edi and 800 // caller-save registers. Restores context. On return removes 801 // stack_space * kPointerSize (GCed). 802 void CallApiFunctionAndReturn(Register function_address, 803 ExternalReference thunk_ref, 804 Operand thunk_last_arg, 805 int stack_space, 806 Operand return_value_operand, 807 Operand* context_restore_operand); 808 809 // Jump to a runtime routine. 810 void JumpToExternalReference(const ExternalReference& ext); 811 812 // --------------------------------------------------------------------------- 813 // Utilities 814 815 void Ret(); 816 817 // Return and drop arguments from stack, where the number of arguments 818 // may be bigger than 2^16 - 1. Requires a scratch register. 819 void Ret(int bytes_dropped, Register scratch); 820 821 // Emit code to discard a non-negative number of pointer-sized elements 822 // from the stack, clobbering only the esp register. 823 void Drop(int element_count); 824 825 void Call(Label* target) { call(target); } 826 void Push(Register src) { push(src); } 827 void Pop(Register dst) { pop(dst); } 828 829 // Emit call to the code we are currently generating. 830 void CallSelf() { 831 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location())); 832 call(self, RelocInfo::CODE_TARGET); 833 } 834 835 // Move if the registers are not identical. 836 void Move(Register target, Register source); 837 838 // Move a constant into a destination using the most efficient encoding. 839 void Move(Register dst, const Immediate& x); 840 void Move(const Operand& dst, const Immediate& x); 841 842 // Move an immediate into an XMM register. 843 void Move(XMMRegister dst, double val); 844 845 // Push a handle value. 846 void Push(Handle<Object> handle) { push(Immediate(handle)); } 847 void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); } 848 849 Handle<Object> CodeObject() { 850 ASSERT(!code_object_.is_null()); 851 return code_object_; 852 } 853 854 // Emit code for a truncating division by a constant. The dividend register is 855 // unchanged, the result is in edx, and eax gets clobbered. 856 void TruncatingDiv(Register dividend, int32_t divisor); 857 858 // --------------------------------------------------------------------------- 859 // StatsCounter support 860 861 void SetCounter(StatsCounter* counter, int value); 862 void IncrementCounter(StatsCounter* counter, int value); 863 void DecrementCounter(StatsCounter* counter, int value); 864 void IncrementCounter(Condition cc, StatsCounter* counter, int value); 865 void DecrementCounter(Condition cc, StatsCounter* counter, int value); 866 867 868 // --------------------------------------------------------------------------- 869 // Debugging 870 871 // Calls Abort(msg) if the condition cc is not satisfied. 872 // Use --debug_code to enable. 873 void Assert(Condition cc, BailoutReason reason); 874 875 void AssertFastElements(Register elements); 876 877 // Like Assert(), but always enabled. 878 void Check(Condition cc, BailoutReason reason); 879 880 // Print a message to stdout and abort execution. 881 void Abort(BailoutReason reason); 882 883 // Check that the stack is aligned. 884 void CheckStackAlignment(); 885 886 // Verify restrictions about code generated in stubs. 887 void set_generating_stub(bool value) { generating_stub_ = value; } 888 bool generating_stub() { return generating_stub_; } 889 void set_has_frame(bool value) { has_frame_ = value; } 890 bool has_frame() { return has_frame_; } 891 inline bool AllowThisStubCall(CodeStub* stub); 892 893 // --------------------------------------------------------------------------- 894 // String utilities. 895 896 // Generate code to do a lookup in the number string cache. If the number in 897 // the register object is found in the cache the generated code falls through 898 // with the result in the result register. The object and the result register 899 // can be the same. If the number is not found in the cache the code jumps to 900 // the label not_found with only the content of register object unchanged. 901 void LookupNumberStringCache(Register object, 902 Register result, 903 Register scratch1, 904 Register scratch2, 905 Label* not_found); 906 907 // Check whether the instance type represents a flat ASCII string. Jump to the 908 // label if not. If the instance type can be scratched specify same register 909 // for both instance type and scratch. 910 void JumpIfInstanceTypeIsNotSequentialAscii(Register instance_type, 911 Register scratch, 912 Label* on_not_flat_ascii_string); 913 914 // Checks if both objects are sequential ASCII strings, and jumps to label 915 // if either is not. 916 void JumpIfNotBothSequentialAsciiStrings(Register object1, 917 Register object2, 918 Register scratch1, 919 Register scratch2, 920 Label* on_not_flat_ascii_strings); 921 922 // Checks if the given register or operand is a unique name 923 void JumpIfNotUniqueName(Register reg, Label* not_unique_name, 924 Label::Distance distance = Label::kFar) { 925 JumpIfNotUniqueName(Operand(reg), not_unique_name, distance); 926 } 927 928 void JumpIfNotUniqueName(Operand operand, Label* not_unique_name, 929 Label::Distance distance = Label::kFar); 930 931 void EmitSeqStringSetCharCheck(Register string, 932 Register index, 933 Register value, 934 uint32_t encoding_mask); 935 936 static int SafepointRegisterStackIndex(Register reg) { 937 return SafepointRegisterStackIndex(reg.code()); 938 } 939 940 // Activation support. 941 void EnterFrame(StackFrame::Type type); 942 void LeaveFrame(StackFrame::Type type); 943 944 // Expects object in eax and returns map with validated enum cache 945 // in eax. Assumes that any other register can be used as a scratch. 946 void CheckEnumCache(Label* call_runtime); 947 948 // AllocationMemento support. Arrays may have an associated 949 // AllocationMemento object that can be checked for in order to pretransition 950 // to another type. 951 // On entry, receiver_reg should point to the array object. 952 // scratch_reg gets clobbered. 953 // If allocation info is present, conditional code is set to equal. 954 void TestJSArrayForAllocationMemento(Register receiver_reg, 955 Register scratch_reg, 956 Label* no_memento_found); 957 958 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg, 959 Register scratch_reg, 960 Label* memento_found) { 961 Label no_memento_found; 962 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg, 963 &no_memento_found); 964 j(equal, memento_found); 965 bind(&no_memento_found); 966 } 967 968 // Jumps to found label if a prototype map has dictionary elements. 969 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0, 970 Register scratch1, Label* found); 971 972 private: 973 bool generating_stub_; 974 bool has_frame_; 975 // This handle will be patched with the code object on installation. 976 Handle<Object> code_object_; 977 978 // Helper functions for generating invokes. 979 void InvokePrologue(const ParameterCount& expected, 980 const ParameterCount& actual, 981 Handle<Code> code_constant, 982 const Operand& code_operand, 983 Label* done, 984 bool* definitely_mismatches, 985 InvokeFlag flag, 986 Label::Distance done_distance, 987 const CallWrapper& call_wrapper = NullCallWrapper()); 988 989 void EnterExitFramePrologue(); 990 void EnterExitFrameEpilogue(int argc, bool save_doubles); 991 992 void LeaveExitFrameEpilogue(bool restore_context); 993 994 // Allocation support helpers. 995 void LoadAllocationTopHelper(Register result, 996 Register scratch, 997 AllocationFlags flags); 998 999 void UpdateAllocationTopHelper(Register result_end, 1000 Register scratch, 1001 AllocationFlags flags); 1002 1003 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace. 1004 void InNewSpace(Register object, 1005 Register scratch, 1006 Condition cc, 1007 Label* condition_met, 1008 Label::Distance condition_met_distance = Label::kFar); 1009 1010 // Helper for finding the mark bits for an address. Afterwards, the 1011 // bitmap register points at the word with the mark bits and the mask 1012 // the position of the first bit. Uses ecx as scratch and leaves addr_reg 1013 // unchanged. 1014 inline void GetMarkBits(Register addr_reg, 1015 Register bitmap_reg, 1016 Register mask_reg); 1017 1018 // Helper for throwing exceptions. Compute a handler address and jump to 1019 // it. See the implementation for register usage. 1020 void JumpToHandlerEntry(); 1021 1022 // Compute memory operands for safepoint stack slots. 1023 Operand SafepointRegisterSlot(Register reg); 1024 static int SafepointRegisterStackIndex(int reg_code); 1025 1026 // Needs access to SafepointRegisterStackIndex for compiled frame 1027 // traversal. 1028 friend class StandardFrame; 1029 }; 1030 1031 1032 // The code patcher is used to patch (typically) small parts of code e.g. for 1033 // debugging and other types of instrumentation. When using the code patcher 1034 // the exact number of bytes specified must be emitted. Is not legal to emit 1035 // relocation information. If any of these constraints are violated it causes 1036 // an assertion. 1037 class CodePatcher { 1038 public: 1039 CodePatcher(byte* address, int size); 1040 virtual ~CodePatcher(); 1041 1042 // Macro assembler to emit code. 1043 MacroAssembler* masm() { return &masm_; } 1044 1045 private: 1046 byte* address_; // The address of the code being patched. 1047 int size_; // Number of bytes of the expected patch size. 1048 MacroAssembler masm_; // Macro assembler used to generate the code. 1049 }; 1050 1051 1052 // ----------------------------------------------------------------------------- 1053 // Static helper functions. 1054 1055 // Generate an Operand for loading a field from an object. 1056 inline Operand FieldOperand(Register object, int offset) { 1057 return Operand(object, offset - kHeapObjectTag); 1058 } 1059 1060 1061 // Generate an Operand for loading an indexed field from an object. 1062 inline Operand FieldOperand(Register object, 1063 Register index, 1064 ScaleFactor scale, 1065 int offset) { 1066 return Operand(object, index, scale, offset - kHeapObjectTag); 1067 } 1068 1069 1070 inline Operand FixedArrayElementOperand(Register array, 1071 Register index_as_smi, 1072 int additional_offset = 0) { 1073 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize; 1074 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset); 1075 } 1076 1077 1078 inline Operand ContextOperand(Register context, int index) { 1079 return Operand(context, Context::SlotOffset(index)); 1080 } 1081 1082 1083 inline Operand GlobalObjectOperand() { 1084 return ContextOperand(esi, Context::GLOBAL_OBJECT_INDEX); 1085 } 1086 1087 1088 // Generates an Operand for saving parameters after PrepareCallApiFunction. 1089 Operand ApiParameterOperand(int index); 1090 1091 1092 #ifdef GENERATED_CODE_COVERAGE 1093 extern void LogGeneratedCodeCoverage(const char* file_line); 1094 #define CODE_COVERAGE_STRINGIFY(x) #x 1095 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) 1096 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) 1097 #define ACCESS_MASM(masm) { \ 1098 byte* ia32_coverage_function = \ 1099 reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \ 1100 masm->pushfd(); \ 1101 masm->pushad(); \ 1102 masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \ 1103 masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \ 1104 masm->pop(eax); \ 1105 masm->popad(); \ 1106 masm->popfd(); \ 1107 } \ 1108 masm-> 1109 #else 1110 #define ACCESS_MASM(masm) masm-> 1111 #endif 1112 1113 1114 } } // namespace v8::internal 1115 1116 #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_ 1117
