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/bailout-reason.h" 10 #include "src/frames.h" 11 #include "src/globals.h" 12 13 namespace v8 { 14 namespace internal { 15 16 // Give alias names to registers for calling conventions. 17 const Register kReturnRegister0 = {Register::kCode_eax}; 18 const Register kReturnRegister1 = {Register::kCode_edx}; 19 const Register kJSFunctionRegister = {Register::kCode_edi}; 20 const Register kContextRegister = {Register::kCode_esi}; 21 const Register kInterpreterAccumulatorRegister = {Register::kCode_eax}; 22 const Register kInterpreterRegisterFileRegister = {Register::kCode_edx}; 23 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx}; 24 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi}; 25 const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax}; 26 const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx}; 27 const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx}; 28 const Register kRuntimeCallArgCountRegister = {Register::kCode_eax}; 29 30 // Spill slots used by interpreter dispatch calling convention. 31 const int kInterpreterDispatchTableSpillSlot = -1; 32 33 // Convenience for platform-independent signatures. We do not normally 34 // distinguish memory operands from other operands on ia32. 35 typedef Operand MemOperand; 36 37 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET }; 38 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK }; 39 enum PointersToHereCheck { 40 kPointersToHereMaybeInteresting, 41 kPointersToHereAreAlwaysInteresting 42 }; 43 44 enum RegisterValueType { REGISTER_VALUE_IS_SMI, REGISTER_VALUE_IS_INT32 }; 45 46 #ifdef DEBUG 47 bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg, 48 Register reg4 = no_reg, Register reg5 = no_reg, 49 Register reg6 = no_reg, Register reg7 = no_reg, 50 Register reg8 = no_reg); 51 #endif 52 53 // MacroAssembler implements a collection of frequently used macros. 54 class MacroAssembler: public Assembler { 55 public: 56 MacroAssembler(Isolate* isolate, void* buffer, int size, 57 CodeObjectRequired create_code_object); 58 59 void Load(Register dst, const Operand& src, Representation r); 60 void Store(Register src, const Operand& dst, Representation r); 61 62 // Load a register with a long value as efficiently as possible. 63 void Set(Register dst, int32_t x) { 64 if (x == 0) { 65 xor_(dst, dst); 66 } else { 67 mov(dst, Immediate(x)); 68 } 69 } 70 void Set(const Operand& dst, int32_t x) { mov(dst, Immediate(x)); } 71 72 // Operations on roots in the root-array. 73 void LoadRoot(Register destination, Heap::RootListIndex index); 74 void StoreRoot(Register source, Register scratch, Heap::RootListIndex index); 75 void CompareRoot(Register with, Register scratch, Heap::RootListIndex index); 76 // These methods can only be used with constant roots (i.e. non-writable 77 // and not in new space). 78 void CompareRoot(Register with, Heap::RootListIndex index); 79 void CompareRoot(const Operand& with, Heap::RootListIndex index); 80 void PushRoot(Heap::RootListIndex index); 81 82 // Compare the object in a register to a value and jump if they are equal. 83 void JumpIfRoot(Register with, Heap::RootListIndex index, Label* if_equal, 84 Label::Distance if_equal_distance = Label::kFar) { 85 CompareRoot(with, index); 86 j(equal, if_equal, if_equal_distance); 87 } 88 void JumpIfRoot(const Operand& with, Heap::RootListIndex index, 89 Label* if_equal, 90 Label::Distance if_equal_distance = Label::kFar) { 91 CompareRoot(with, index); 92 j(equal, if_equal, if_equal_distance); 93 } 94 95 // Compare the object in a register to a value and jump if they are not equal. 96 void JumpIfNotRoot(Register with, Heap::RootListIndex index, 97 Label* if_not_equal, 98 Label::Distance if_not_equal_distance = Label::kFar) { 99 CompareRoot(with, index); 100 j(not_equal, if_not_equal, if_not_equal_distance); 101 } 102 void JumpIfNotRoot(const Operand& with, Heap::RootListIndex index, 103 Label* if_not_equal, 104 Label::Distance if_not_equal_distance = Label::kFar) { 105 CompareRoot(with, index); 106 j(not_equal, if_not_equal, if_not_equal_distance); 107 } 108 109 // --------------------------------------------------------------------------- 110 // GC Support 111 enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd }; 112 113 // Record in the remembered set the fact that we have a pointer to new space 114 // at the address pointed to by the addr register. Only works if addr is not 115 // in new space. 116 void RememberedSetHelper(Register object, // Used for debug code. 117 Register addr, Register scratch, 118 SaveFPRegsMode save_fp, 119 RememberedSetFinalAction and_then); 120 121 void CheckPageFlag(Register object, Register scratch, int mask, Condition cc, 122 Label* condition_met, 123 Label::Distance condition_met_distance = Label::kFar); 124 125 void CheckPageFlagForMap( 126 Handle<Map> map, int mask, Condition cc, Label* condition_met, 127 Label::Distance condition_met_distance = Label::kFar); 128 129 // Check if object is in new space. Jumps if the object is not in new space. 130 // The register scratch can be object itself, but scratch will be clobbered. 131 void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch, 132 Label::Distance distance = Label::kFar) { 133 InNewSpace(object, scratch, zero, branch, distance); 134 } 135 136 // Check if object is in new space. Jumps if the object is in new space. 137 // The register scratch can be object itself, but it will be clobbered. 138 void JumpIfInNewSpace(Register object, Register scratch, Label* branch, 139 Label::Distance distance = Label::kFar) { 140 InNewSpace(object, scratch, not_zero, branch, distance); 141 } 142 143 // Check if an object has a given incremental marking color. Also uses ecx! 144 void HasColor(Register object, Register scratch0, Register scratch1, 145 Label* has_color, Label::Distance has_color_distance, 146 int first_bit, int second_bit); 147 148 void JumpIfBlack(Register object, Register scratch0, Register scratch1, 149 Label* on_black, 150 Label::Distance on_black_distance = Label::kFar); 151 152 // Checks the color of an object. If the object is white we jump to the 153 // incremental marker. 154 void JumpIfWhite(Register value, Register scratch1, Register scratch2, 155 Label* value_is_white, Label::Distance distance); 156 157 // Notify the garbage collector that we wrote a pointer into an object. 158 // |object| is the object being stored into, |value| is the object being 159 // stored. value and scratch registers are clobbered by the operation. 160 // The offset is the offset from the start of the object, not the offset from 161 // the tagged HeapObject pointer. For use with FieldOperand(reg, off). 162 void RecordWriteField( 163 Register object, int offset, Register value, Register scratch, 164 SaveFPRegsMode save_fp, 165 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 166 SmiCheck smi_check = INLINE_SMI_CHECK, 167 PointersToHereCheck pointers_to_here_check_for_value = 168 kPointersToHereMaybeInteresting); 169 170 // As above, but the offset has the tag presubtracted. For use with 171 // Operand(reg, off). 172 void RecordWriteContextSlot( 173 Register context, int offset, Register value, Register scratch, 174 SaveFPRegsMode save_fp, 175 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 176 SmiCheck smi_check = INLINE_SMI_CHECK, 177 PointersToHereCheck pointers_to_here_check_for_value = 178 kPointersToHereMaybeInteresting) { 179 RecordWriteField(context, offset + kHeapObjectTag, value, scratch, save_fp, 180 remembered_set_action, smi_check, 181 pointers_to_here_check_for_value); 182 } 183 184 // Notify the garbage collector that we wrote a pointer into a fixed array. 185 // |array| is the array being stored into, |value| is the 186 // object being stored. |index| is the array index represented as a 187 // Smi. All registers are clobbered by the operation RecordWriteArray 188 // filters out smis so it does not update the write barrier if the 189 // value is a smi. 190 void RecordWriteArray( 191 Register array, Register value, Register index, SaveFPRegsMode save_fp, 192 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 193 SmiCheck smi_check = INLINE_SMI_CHECK, 194 PointersToHereCheck pointers_to_here_check_for_value = 195 kPointersToHereMaybeInteresting); 196 197 // For page containing |object| mark region covering |address| 198 // dirty. |object| is the object being stored into, |value| is the 199 // object being stored. The address and value registers are clobbered by the 200 // operation. RecordWrite filters out smis so it does not update the 201 // write barrier if the value is a smi. 202 void RecordWrite( 203 Register object, Register address, Register value, SaveFPRegsMode save_fp, 204 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 205 SmiCheck smi_check = INLINE_SMI_CHECK, 206 PointersToHereCheck pointers_to_here_check_for_value = 207 kPointersToHereMaybeInteresting); 208 209 // For page containing |object| mark the region covering the object's map 210 // dirty. |object| is the object being stored into, |map| is the Map object 211 // that was stored. 212 void RecordWriteForMap(Register object, Handle<Map> map, Register scratch1, 213 Register scratch2, SaveFPRegsMode save_fp); 214 215 // --------------------------------------------------------------------------- 216 // Debugger Support 217 218 void DebugBreak(); 219 220 // Generates function and stub prologue code. 221 void StubPrologue(); 222 void Prologue(bool code_pre_aging); 223 224 // Enter specific kind of exit frame. Expects the number of 225 // arguments in register eax and sets up the number of arguments in 226 // register edi and the pointer to the first argument in register 227 // esi. 228 void EnterExitFrame(bool save_doubles); 229 230 void EnterApiExitFrame(int argc); 231 232 // Leave the current exit frame. Expects the return value in 233 // register eax:edx (untouched) and the pointer to the first 234 // argument in register esi (if pop_arguments == true). 235 void LeaveExitFrame(bool save_doubles, bool pop_arguments = true); 236 237 // Leave the current exit frame. Expects the return value in 238 // register eax (untouched). 239 void LeaveApiExitFrame(bool restore_context); 240 241 // Find the function context up the context chain. 242 void LoadContext(Register dst, int context_chain_length); 243 244 // Load the global proxy from the current context. 245 void LoadGlobalProxy(Register dst); 246 247 // Conditionally load the cached Array transitioned map of type 248 // transitioned_kind from the native context if the map in register 249 // map_in_out is the cached Array map in the native context of 250 // expected_kind. 251 void LoadTransitionedArrayMapConditional(ElementsKind expected_kind, 252 ElementsKind transitioned_kind, 253 Register map_in_out, 254 Register scratch, 255 Label* no_map_match); 256 257 // Load the global function with the given index. 258 void LoadGlobalFunction(int index, Register function); 259 260 // Load the initial map from the global function. The registers 261 // function and map can be the same. 262 void LoadGlobalFunctionInitialMap(Register function, Register map); 263 264 // Push and pop the registers that can hold pointers. 265 void PushSafepointRegisters() { pushad(); } 266 void PopSafepointRegisters() { popad(); } 267 // Store the value in register/immediate src in the safepoint 268 // register stack slot for register dst. 269 void StoreToSafepointRegisterSlot(Register dst, Register src); 270 void StoreToSafepointRegisterSlot(Register dst, Immediate src); 271 void LoadFromSafepointRegisterSlot(Register dst, Register src); 272 273 void LoadHeapObject(Register result, Handle<HeapObject> object); 274 void CmpHeapObject(Register reg, Handle<HeapObject> object); 275 void PushHeapObject(Handle<HeapObject> object); 276 277 void LoadObject(Register result, Handle<Object> object) { 278 AllowDeferredHandleDereference heap_object_check; 279 if (object->IsHeapObject()) { 280 LoadHeapObject(result, Handle<HeapObject>::cast(object)); 281 } else { 282 Move(result, Immediate(object)); 283 } 284 } 285 286 void CmpObject(Register reg, Handle<Object> object) { 287 AllowDeferredHandleDereference heap_object_check; 288 if (object->IsHeapObject()) { 289 CmpHeapObject(reg, Handle<HeapObject>::cast(object)); 290 } else { 291 cmp(reg, Immediate(object)); 292 } 293 } 294 295 // Compare the given value and the value of weak cell. 296 void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch); 297 298 void GetWeakValue(Register value, Handle<WeakCell> cell); 299 300 // Load the value of the weak cell in the value register. Branch to the given 301 // miss label if the weak cell was cleared. 302 void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss); 303 304 // --------------------------------------------------------------------------- 305 // JavaScript invokes 306 307 // Invoke the JavaScript function code by either calling or jumping. 308 309 void InvokeFunctionCode(Register function, Register new_target, 310 const ParameterCount& expected, 311 const ParameterCount& actual, InvokeFlag flag, 312 const CallWrapper& call_wrapper); 313 314 void FloodFunctionIfStepping(Register fun, Register new_target, 315 const ParameterCount& expected, 316 const ParameterCount& actual); 317 318 // Invoke the JavaScript function in the given register. Changes the 319 // current context to the context in the function before invoking. 320 void InvokeFunction(Register function, Register new_target, 321 const ParameterCount& actual, InvokeFlag flag, 322 const CallWrapper& call_wrapper); 323 324 void InvokeFunction(Register function, const ParameterCount& expected, 325 const ParameterCount& actual, InvokeFlag flag, 326 const CallWrapper& call_wrapper); 327 328 void InvokeFunction(Handle<JSFunction> function, 329 const ParameterCount& expected, 330 const ParameterCount& actual, InvokeFlag flag, 331 const CallWrapper& call_wrapper); 332 333 // Invoke specified builtin JavaScript function. 334 void InvokeBuiltin(int native_context_index, InvokeFlag flag, 335 const CallWrapper& call_wrapper = NullCallWrapper()); 336 337 // Store the function for the given builtin in the target register. 338 void GetBuiltinFunction(Register target, int native_context_index); 339 340 // Expression support 341 // cvtsi2sd instruction only writes to the low 64-bit of dst register, which 342 // hinders register renaming and makes dependence chains longer. So we use 343 // xorps to clear the dst register before cvtsi2sd to solve this issue. 344 void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); } 345 void Cvtsi2sd(XMMRegister dst, const Operand& src); 346 347 // Support for constant splitting. 348 bool IsUnsafeImmediate(const Immediate& x); 349 void SafeMove(Register dst, const Immediate& x); 350 void SafePush(const Immediate& x); 351 352 // Compare object type for heap object. 353 // Incoming register is heap_object and outgoing register is map. 354 void CmpObjectType(Register heap_object, InstanceType type, Register map); 355 356 // Compare instance type for map. 357 void CmpInstanceType(Register map, InstanceType type); 358 359 // Check if a map for a JSObject indicates that the object has fast elements. 360 // Jump to the specified label if it does not. 361 void CheckFastElements(Register map, Label* fail, 362 Label::Distance distance = Label::kFar); 363 364 // Check if a map for a JSObject indicates that the object can have both smi 365 // and HeapObject elements. Jump to the specified label if it does not. 366 void CheckFastObjectElements(Register map, Label* fail, 367 Label::Distance distance = Label::kFar); 368 369 // Check if a map for a JSObject indicates that the object has fast smi only 370 // elements. Jump to the specified label if it does not. 371 void CheckFastSmiElements(Register map, Label* fail, 372 Label::Distance distance = Label::kFar); 373 374 // Check to see if maybe_number can be stored as a double in 375 // FastDoubleElements. If it can, store it at the index specified by key in 376 // the FastDoubleElements array elements, otherwise jump to fail. 377 void StoreNumberToDoubleElements(Register maybe_number, Register elements, 378 Register key, Register scratch1, 379 XMMRegister scratch2, Label* fail, 380 int offset = 0); 381 382 // Compare an object's map with the specified map. 383 void CompareMap(Register obj, Handle<Map> map); 384 385 // Check if the map of an object is equal to a specified map and branch to 386 // label if not. Skip the smi check if not required (object is known to be a 387 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match 388 // against maps that are ElementsKind transition maps of the specified map. 389 void CheckMap(Register obj, Handle<Map> map, Label* fail, 390 SmiCheckType smi_check_type); 391 392 // Check if the map of an object is equal to a specified weak map and branch 393 // to a specified target if equal. Skip the smi check if not required 394 // (object is known to be a heap object) 395 void DispatchWeakMap(Register obj, Register scratch1, Register scratch2, 396 Handle<WeakCell> cell, Handle<Code> success, 397 SmiCheckType smi_check_type); 398 399 // Check if the object in register heap_object is a string. Afterwards the 400 // register map contains the object map and the register instance_type 401 // contains the instance_type. The registers map and instance_type can be the 402 // same in which case it contains the instance type afterwards. Either of the 403 // registers map and instance_type can be the same as heap_object. 404 Condition IsObjectStringType(Register heap_object, Register map, 405 Register instance_type); 406 407 // Check if the object in register heap_object is a name. Afterwards the 408 // register map contains the object map and the register instance_type 409 // contains the instance_type. The registers map and instance_type can be the 410 // same in which case it contains the instance type afterwards. Either of the 411 // registers map and instance_type can be the same as heap_object. 412 Condition IsObjectNameType(Register heap_object, Register map, 413 Register instance_type); 414 415 // FCmp is similar to integer cmp, but requires unsigned 416 // jcc instructions (je, ja, jae, jb, jbe, je, and jz). 417 void FCmp(); 418 419 void ClampUint8(Register reg); 420 421 void ClampDoubleToUint8(XMMRegister input_reg, XMMRegister scratch_reg, 422 Register result_reg); 423 424 void SlowTruncateToI(Register result_reg, Register input_reg, 425 int offset = HeapNumber::kValueOffset - kHeapObjectTag); 426 427 void TruncateHeapNumberToI(Register result_reg, Register input_reg); 428 void TruncateDoubleToI(Register result_reg, XMMRegister input_reg); 429 430 void DoubleToI(Register result_reg, XMMRegister input_reg, 431 XMMRegister scratch, MinusZeroMode minus_zero_mode, 432 Label* lost_precision, Label* is_nan, Label* minus_zero, 433 Label::Distance dst = Label::kFar); 434 435 // Smi tagging support. 436 void SmiTag(Register reg) { 437 STATIC_ASSERT(kSmiTag == 0); 438 STATIC_ASSERT(kSmiTagSize == 1); 439 add(reg, reg); 440 } 441 void SmiUntag(Register reg) { 442 sar(reg, kSmiTagSize); 443 } 444 445 // Modifies the register even if it does not contain a Smi! 446 void SmiUntag(Register reg, Label* is_smi) { 447 STATIC_ASSERT(kSmiTagSize == 1); 448 sar(reg, kSmiTagSize); 449 STATIC_ASSERT(kSmiTag == 0); 450 j(not_carry, is_smi); 451 } 452 453 void LoadUint32(XMMRegister dst, Register src) { 454 LoadUint32(dst, Operand(src)); 455 } 456 void LoadUint32(XMMRegister dst, const Operand& src); 457 458 // Jump the register contains a smi. 459 inline void JumpIfSmi(Register value, Label* smi_label, 460 Label::Distance distance = Label::kFar) { 461 test(value, Immediate(kSmiTagMask)); 462 j(zero, smi_label, distance); 463 } 464 // Jump if the operand is a smi. 465 inline void JumpIfSmi(Operand value, Label* smi_label, 466 Label::Distance distance = Label::kFar) { 467 test(value, Immediate(kSmiTagMask)); 468 j(zero, smi_label, distance); 469 } 470 // Jump if register contain a non-smi. 471 inline void JumpIfNotSmi(Register value, Label* not_smi_label, 472 Label::Distance distance = Label::kFar) { 473 test(value, Immediate(kSmiTagMask)); 474 j(not_zero, not_smi_label, distance); 475 } 476 477 void LoadInstanceDescriptors(Register map, Register descriptors); 478 void EnumLength(Register dst, Register map); 479 void NumberOfOwnDescriptors(Register dst, Register map); 480 void LoadAccessor(Register dst, Register holder, int accessor_index, 481 AccessorComponent accessor); 482 483 template<typename Field> 484 void DecodeField(Register reg) { 485 static const int shift = Field::kShift; 486 static const int mask = Field::kMask >> Field::kShift; 487 if (shift != 0) { 488 sar(reg, shift); 489 } 490 and_(reg, Immediate(mask)); 491 } 492 493 template<typename Field> 494 void DecodeFieldToSmi(Register reg) { 495 static const int shift = Field::kShift; 496 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize; 497 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0); 498 STATIC_ASSERT(kSmiTag == 0); 499 if (shift < kSmiTagSize) { 500 shl(reg, kSmiTagSize - shift); 501 } else if (shift > kSmiTagSize) { 502 sar(reg, shift - kSmiTagSize); 503 } 504 and_(reg, Immediate(mask)); 505 } 506 507 void LoadPowerOf2(XMMRegister dst, Register scratch, int power); 508 509 // Abort execution if argument is not a number, enabled via --debug-code. 510 void AssertNumber(Register object); 511 512 // Abort execution if argument is not a smi, enabled via --debug-code. 513 void AssertSmi(Register object); 514 515 // Abort execution if argument is a smi, enabled via --debug-code. 516 void AssertNotSmi(Register object); 517 518 // Abort execution if argument is not a string, enabled via --debug-code. 519 void AssertString(Register object); 520 521 // Abort execution if argument is not a name, enabled via --debug-code. 522 void AssertName(Register object); 523 524 // Abort execution if argument is not a JSFunction, enabled via --debug-code. 525 void AssertFunction(Register object); 526 527 // Abort execution if argument is not a JSBoundFunction, 528 // enabled via --debug-code. 529 void AssertBoundFunction(Register object); 530 531 // Abort execution if argument is not undefined or an AllocationSite, enabled 532 // via --debug-code. 533 void AssertUndefinedOrAllocationSite(Register object); 534 535 // --------------------------------------------------------------------------- 536 // Exception handling 537 538 // Push a new stack handler and link it into stack handler chain. 539 void PushStackHandler(); 540 541 // Unlink the stack handler on top of the stack from the stack handler chain. 542 void PopStackHandler(); 543 544 // --------------------------------------------------------------------------- 545 // Inline caching support 546 547 // Generate code for checking access rights - used for security checks 548 // on access to global objects across environments. The holder register 549 // is left untouched, but the scratch register is clobbered. 550 void CheckAccessGlobalProxy(Register holder_reg, Register scratch1, 551 Register scratch2, Label* miss); 552 553 void GetNumberHash(Register r0, Register scratch); 554 555 void LoadFromNumberDictionary(Label* miss, Register elements, Register key, 556 Register r0, Register r1, Register r2, 557 Register result); 558 559 // --------------------------------------------------------------------------- 560 // Allocation support 561 562 // Allocate an object in new space or old space. If the given space 563 // is exhausted control continues at the gc_required label. The allocated 564 // object is returned in result and end of the new object is returned in 565 // result_end. The register scratch can be passed as no_reg in which case 566 // an additional object reference will be added to the reloc info. The 567 // returned pointers in result and result_end have not yet been tagged as 568 // heap objects. If result_contains_top_on_entry is true the content of 569 // result is known to be the allocation top on entry (could be result_end 570 // from a previous call). If result_contains_top_on_entry is true scratch 571 // should be no_reg as it is never used. 572 void Allocate(int object_size, Register result, Register result_end, 573 Register scratch, Label* gc_required, AllocationFlags flags); 574 575 void Allocate(int header_size, ScaleFactor element_size, 576 Register element_count, RegisterValueType element_count_type, 577 Register result, Register result_end, Register scratch, 578 Label* gc_required, AllocationFlags flags); 579 580 void Allocate(Register object_size, Register result, Register result_end, 581 Register scratch, Label* gc_required, AllocationFlags flags); 582 583 // Allocate a heap number in new space with undefined value. The 584 // register scratch2 can be passed as no_reg; the others must be 585 // valid registers. Returns tagged pointer in result register, or 586 // jumps to gc_required if new space is full. 587 void AllocateHeapNumber(Register result, Register scratch1, Register scratch2, 588 Label* gc_required, MutableMode mode = IMMUTABLE); 589 590 // Allocate a sequential string. All the header fields of the string object 591 // are initialized. 592 void AllocateTwoByteString(Register result, Register length, 593 Register scratch1, Register scratch2, 594 Register scratch3, Label* gc_required); 595 void AllocateOneByteString(Register result, Register length, 596 Register scratch1, Register scratch2, 597 Register scratch3, Label* gc_required); 598 void AllocateOneByteString(Register result, int length, Register scratch1, 599 Register scratch2, Label* gc_required); 600 601 // Allocate a raw cons string object. Only the map field of the result is 602 // initialized. 603 void AllocateTwoByteConsString(Register result, Register scratch1, 604 Register scratch2, Label* gc_required); 605 void AllocateOneByteConsString(Register result, Register scratch1, 606 Register scratch2, Label* gc_required); 607 608 // Allocate a raw sliced string object. Only the map field of the result is 609 // initialized. 610 void AllocateTwoByteSlicedString(Register result, Register scratch1, 611 Register scratch2, Label* gc_required); 612 void AllocateOneByteSlicedString(Register result, Register scratch1, 613 Register scratch2, Label* gc_required); 614 615 // Allocate and initialize a JSValue wrapper with the specified {constructor} 616 // and {value}. 617 void AllocateJSValue(Register result, Register constructor, Register value, 618 Register scratch, Label* gc_required); 619 620 // Copy memory, byte-by-byte, from source to destination. Not optimized for 621 // long or aligned copies. 622 // The contents of index and scratch are destroyed. 623 void CopyBytes(Register source, Register destination, Register length, 624 Register scratch); 625 626 // Initialize fields with filler values. Fields starting at |current_address| 627 // not including |end_address| are overwritten with the value in |filler|. At 628 // the end the loop, |current_address| takes the value of |end_address|. 629 void InitializeFieldsWithFiller(Register current_address, 630 Register end_address, Register filler); 631 632 // --------------------------------------------------------------------------- 633 // Support functions. 634 635 // Check a boolean-bit of a Smi field. 636 void BooleanBitTest(Register object, int field_offset, int bit_index); 637 638 // Check if result is zero and op is negative. 639 void NegativeZeroTest(Register result, Register op, Label* then_label); 640 641 // Check if result is zero and any of op1 and op2 are negative. 642 // Register scratch is destroyed, and it must be different from op2. 643 void NegativeZeroTest(Register result, Register op1, Register op2, 644 Register scratch, Label* then_label); 645 646 // Machine code version of Map::GetConstructor(). 647 // |temp| holds |result|'s map when done. 648 void GetMapConstructor(Register result, Register map, Register temp); 649 650 // Try to get function prototype of a function and puts the value in 651 // the result register. Checks that the function really is a 652 // function and jumps to the miss label if the fast checks fail. The 653 // function register will be untouched; the other registers may be 654 // clobbered. 655 void TryGetFunctionPrototype(Register function, Register result, 656 Register scratch, Label* miss); 657 658 // Picks out an array index from the hash field. 659 // Register use: 660 // hash - holds the index's hash. Clobbered. 661 // index - holds the overwritten index on exit. 662 void IndexFromHash(Register hash, Register index); 663 664 // --------------------------------------------------------------------------- 665 // Runtime calls 666 667 // Call a code stub. Generate the code if necessary. 668 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None()); 669 670 // Tail call a code stub (jump). Generate the code if necessary. 671 void TailCallStub(CodeStub* stub); 672 673 // Return from a code stub after popping its arguments. 674 void StubReturn(int argc); 675 676 // Call a runtime routine. 677 void CallRuntime(const Runtime::Function* f, int num_arguments, 678 SaveFPRegsMode save_doubles = kDontSaveFPRegs); 679 void CallRuntimeSaveDoubles(Runtime::FunctionId fid) { 680 const Runtime::Function* function = Runtime::FunctionForId(fid); 681 CallRuntime(function, function->nargs, kSaveFPRegs); 682 } 683 684 // Convenience function: Same as above, but takes the fid instead. 685 void CallRuntime(Runtime::FunctionId fid, 686 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 687 const Runtime::Function* function = Runtime::FunctionForId(fid); 688 CallRuntime(function, function->nargs, save_doubles); 689 } 690 691 // Convenience function: Same as above, but takes the fid instead. 692 void CallRuntime(Runtime::FunctionId fid, int num_arguments, 693 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 694 CallRuntime(Runtime::FunctionForId(fid), num_arguments, save_doubles); 695 } 696 697 // Convenience function: call an external reference. 698 void CallExternalReference(ExternalReference ref, int num_arguments); 699 700 // Convenience function: tail call a runtime routine (jump). 701 void TailCallRuntime(Runtime::FunctionId fid); 702 703 // Before calling a C-function from generated code, align arguments on stack. 704 // After aligning the frame, arguments must be stored in esp[0], esp[4], 705 // etc., not pushed. The argument count assumes all arguments are word sized. 706 // Some compilers/platforms require the stack to be aligned when calling 707 // C++ code. 708 // Needs a scratch register to do some arithmetic. This register will be 709 // trashed. 710 void PrepareCallCFunction(int num_arguments, Register scratch); 711 712 // Calls a C function and cleans up the space for arguments allocated 713 // by PrepareCallCFunction. The called function is not allowed to trigger a 714 // garbage collection, since that might move the code and invalidate the 715 // return address (unless this is somehow accounted for by the called 716 // function). 717 void CallCFunction(ExternalReference function, int num_arguments); 718 void CallCFunction(Register function, int num_arguments); 719 720 // Jump to a runtime routine. 721 void JumpToExternalReference(const ExternalReference& ext); 722 723 // --------------------------------------------------------------------------- 724 // Utilities 725 726 void Ret(); 727 728 // Return and drop arguments from stack, where the number of arguments 729 // may be bigger than 2^16 - 1. Requires a scratch register. 730 void Ret(int bytes_dropped, Register scratch); 731 732 // Emit code to discard a non-negative number of pointer-sized elements 733 // from the stack, clobbering only the esp register. 734 void Drop(int element_count); 735 736 void Call(Label* target) { call(target); } 737 void Call(Handle<Code> target, RelocInfo::Mode rmode) { call(target, rmode); } 738 void Jump(Handle<Code> target, RelocInfo::Mode rmode) { jmp(target, rmode); } 739 void Push(Register src) { push(src); } 740 void Push(const Operand& src) { push(src); } 741 void Push(Immediate value) { push(value); } 742 void Pop(Register dst) { pop(dst); } 743 void Pop(const Operand& dst) { pop(dst); } 744 void PushReturnAddressFrom(Register src) { push(src); } 745 void PopReturnAddressTo(Register dst) { pop(dst); } 746 747 // Non-SSE2 instructions. 748 void Pextrd(Register dst, XMMRegister src, int8_t imm8); 749 void Pinsrd(XMMRegister dst, Register src, int8_t imm8) { 750 Pinsrd(dst, Operand(src), imm8); 751 } 752 void Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8); 753 754 void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); } 755 void Lzcnt(Register dst, const Operand& src); 756 757 void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); } 758 void Tzcnt(Register dst, const Operand& src); 759 760 void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); } 761 void Popcnt(Register dst, const Operand& src); 762 763 // Emit call to the code we are currently generating. 764 void CallSelf() { 765 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location())); 766 call(self, RelocInfo::CODE_TARGET); 767 } 768 769 // Move if the registers are not identical. 770 void Move(Register target, Register source); 771 772 // Move a constant into a destination using the most efficient encoding. 773 void Move(Register dst, const Immediate& x); 774 void Move(const Operand& dst, const Immediate& x); 775 776 // Move an immediate into an XMM register. 777 void Move(XMMRegister dst, uint32_t src); 778 void Move(XMMRegister dst, uint64_t src); 779 void Move(XMMRegister dst, double src) { Move(dst, bit_cast<uint64_t>(src)); } 780 781 void Move(Register dst, Smi* source) { Move(dst, Immediate(source)); } 782 783 // Push a handle value. 784 void Push(Handle<Object> handle) { push(Immediate(handle)); } 785 void Push(Smi* smi) { Push(Immediate(smi)); } 786 787 Handle<Object> CodeObject() { 788 DCHECK(!code_object_.is_null()); 789 return code_object_; 790 } 791 792 // Emit code for a truncating division by a constant. The dividend register is 793 // unchanged, the result is in edx, and eax gets clobbered. 794 void TruncatingDiv(Register dividend, int32_t divisor); 795 796 // --------------------------------------------------------------------------- 797 // StatsCounter support 798 799 void SetCounter(StatsCounter* counter, int value); 800 void IncrementCounter(StatsCounter* counter, int value); 801 void DecrementCounter(StatsCounter* counter, int value); 802 void IncrementCounter(Condition cc, StatsCounter* counter, int value); 803 void DecrementCounter(Condition cc, StatsCounter* counter, int value); 804 805 // --------------------------------------------------------------------------- 806 // Debugging 807 808 // Calls Abort(msg) if the condition cc is not satisfied. 809 // Use --debug_code to enable. 810 void Assert(Condition cc, BailoutReason reason); 811 812 void AssertFastElements(Register elements); 813 814 // Like Assert(), but always enabled. 815 void Check(Condition cc, BailoutReason reason); 816 817 // Print a message to stdout and abort execution. 818 void Abort(BailoutReason reason); 819 820 // Check that the stack is aligned. 821 void CheckStackAlignment(); 822 823 // Verify restrictions about code generated in stubs. 824 void set_generating_stub(bool value) { generating_stub_ = value; } 825 bool generating_stub() { return generating_stub_; } 826 void set_has_frame(bool value) { has_frame_ = value; } 827 bool has_frame() { return has_frame_; } 828 inline bool AllowThisStubCall(CodeStub* stub); 829 830 // --------------------------------------------------------------------------- 831 // String utilities. 832 833 // Check whether the instance type represents a flat one-byte string. Jump to 834 // the label if not. If the instance type can be scratched specify same 835 // register for both instance type and scratch. 836 void JumpIfInstanceTypeIsNotSequentialOneByte( 837 Register instance_type, Register scratch, 838 Label* on_not_flat_one_byte_string); 839 840 // Checks if both objects are sequential one-byte strings, and jumps to label 841 // if either is not. 842 void JumpIfNotBothSequentialOneByteStrings( 843 Register object1, Register object2, Register scratch1, Register scratch2, 844 Label* on_not_flat_one_byte_strings); 845 846 // Checks if the given register or operand is a unique name 847 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name, 848 Label::Distance distance = Label::kFar) { 849 JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance); 850 } 851 852 void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name, 853 Label::Distance distance = Label::kFar); 854 855 void EmitSeqStringSetCharCheck(Register string, Register index, 856 Register value, uint32_t encoding_mask); 857 858 static int SafepointRegisterStackIndex(Register reg) { 859 return SafepointRegisterStackIndex(reg.code()); 860 } 861 862 // Load the type feedback vector from a JavaScript frame. 863 void EmitLoadTypeFeedbackVector(Register vector); 864 865 // Activation support. 866 void EnterFrame(StackFrame::Type type); 867 void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg); 868 void LeaveFrame(StackFrame::Type type); 869 870 // Expects object in eax and returns map with validated enum cache 871 // in eax. Assumes that any other register can be used as a scratch. 872 void CheckEnumCache(Label* call_runtime); 873 874 // AllocationMemento support. Arrays may have an associated 875 // AllocationMemento object that can be checked for in order to pretransition 876 // to another type. 877 // On entry, receiver_reg should point to the array object. 878 // scratch_reg gets clobbered. 879 // If allocation info is present, conditional code is set to equal. 880 void TestJSArrayForAllocationMemento(Register receiver_reg, 881 Register scratch_reg, 882 Label* no_memento_found); 883 884 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg, 885 Register scratch_reg, 886 Label* memento_found) { 887 Label no_memento_found; 888 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg, 889 &no_memento_found); 890 j(equal, memento_found); 891 bind(&no_memento_found); 892 } 893 894 // Jumps to found label if a prototype map has dictionary elements. 895 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0, 896 Register scratch1, Label* found); 897 898 private: 899 bool generating_stub_; 900 bool has_frame_; 901 // This handle will be patched with the code object on installation. 902 Handle<Object> code_object_; 903 904 // Helper functions for generating invokes. 905 void InvokePrologue(const ParameterCount& expected, 906 const ParameterCount& actual, Label* done, 907 bool* definitely_mismatches, InvokeFlag flag, 908 Label::Distance done_distance, 909 const CallWrapper& call_wrapper); 910 911 void EnterExitFramePrologue(); 912 void EnterExitFrameEpilogue(int argc, bool save_doubles); 913 914 void LeaveExitFrameEpilogue(bool restore_context); 915 916 // Allocation support helpers. 917 void LoadAllocationTopHelper(Register result, Register scratch, 918 AllocationFlags flags); 919 920 void UpdateAllocationTopHelper(Register result_end, Register scratch, 921 AllocationFlags flags); 922 923 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace. 924 void InNewSpace(Register object, Register scratch, Condition cc, 925 Label* condition_met, 926 Label::Distance condition_met_distance = Label::kFar); 927 928 // Helper for finding the mark bits for an address. Afterwards, the 929 // bitmap register points at the word with the mark bits and the mask 930 // the position of the first bit. Uses ecx as scratch and leaves addr_reg 931 // unchanged. 932 inline void GetMarkBits(Register addr_reg, Register bitmap_reg, 933 Register mask_reg); 934 935 // Compute memory operands for safepoint stack slots. 936 Operand SafepointRegisterSlot(Register reg); 937 static int SafepointRegisterStackIndex(int reg_code); 938 939 // Needs access to SafepointRegisterStackIndex for compiled frame 940 // traversal. 941 friend class StandardFrame; 942 }; 943 944 // The code patcher is used to patch (typically) small parts of code e.g. for 945 // debugging and other types of instrumentation. When using the code patcher 946 // the exact number of bytes specified must be emitted. Is not legal to emit 947 // relocation information. If any of these constraints are violated it causes 948 // an assertion. 949 class CodePatcher { 950 public: 951 CodePatcher(Isolate* isolate, byte* address, int size); 952 ~CodePatcher(); 953 954 // Macro assembler to emit code. 955 MacroAssembler* masm() { return &masm_; } 956 957 private: 958 byte* address_; // The address of the code being patched. 959 int size_; // Number of bytes of the expected patch size. 960 MacroAssembler masm_; // Macro assembler used to generate the code. 961 }; 962 963 // ----------------------------------------------------------------------------- 964 // Static helper functions. 965 966 // Generate an Operand for loading a field from an object. 967 inline Operand FieldOperand(Register object, int offset) { 968 return Operand(object, offset - kHeapObjectTag); 969 } 970 971 // Generate an Operand for loading an indexed field from an object. 972 inline Operand FieldOperand(Register object, Register index, ScaleFactor scale, 973 int offset) { 974 return Operand(object, index, scale, offset - kHeapObjectTag); 975 } 976 977 inline Operand FixedArrayElementOperand(Register array, Register index_as_smi, 978 int additional_offset = 0) { 979 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize; 980 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset); 981 } 982 983 inline Operand ContextOperand(Register context, int index) { 984 return Operand(context, Context::SlotOffset(index)); 985 } 986 987 inline Operand ContextOperand(Register context, Register index) { 988 return Operand(context, index, times_pointer_size, Context::SlotOffset(0)); 989 } 990 991 inline Operand NativeContextOperand() { 992 return ContextOperand(esi, Context::NATIVE_CONTEXT_INDEX); 993 } 994 995 #ifdef GENERATED_CODE_COVERAGE 996 extern void LogGeneratedCodeCoverage(const char* file_line); 997 #define CODE_COVERAGE_STRINGIFY(x) #x 998 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) 999 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) 1000 #define ACCESS_MASM(masm) { \ 1001 byte* ia32_coverage_function = \ 1002 reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \ 1003 masm->pushfd(); \ 1004 masm->pushad(); \ 1005 masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \ 1006 masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \ 1007 masm->pop(eax); \ 1008 masm->popad(); \ 1009 masm->popfd(); \ 1010 } \ 1011 masm-> 1012 #else 1013 #define ACCESS_MASM(masm) masm-> 1014 #endif 1015 1016 } // namespace internal 1017 } // namespace v8 1018 1019 #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_ 1020
