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_X87_MACRO_ASSEMBLER_X87_H_ 6 #define V8_X87_MACRO_ASSEMBLER_X87_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 void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch); 296 void GetWeakValue(Register value, Handle<WeakCell> cell); 297 void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss); 298 299 // --------------------------------------------------------------------------- 300 // JavaScript invokes 301 302 // Invoke the JavaScript function code by either calling or jumping. 303 304 void InvokeFunctionCode(Register function, Register new_target, 305 const ParameterCount& expected, 306 const ParameterCount& actual, InvokeFlag flag, 307 const CallWrapper& call_wrapper); 308 309 void FloodFunctionIfStepping(Register fun, Register new_target, 310 const ParameterCount& expected, 311 const ParameterCount& actual); 312 313 // Invoke the JavaScript function in the given register. Changes the 314 // current context to the context in the function before invoking. 315 void InvokeFunction(Register function, Register new_target, 316 const ParameterCount& actual, InvokeFlag flag, 317 const CallWrapper& call_wrapper); 318 319 void InvokeFunction(Register function, const ParameterCount& expected, 320 const ParameterCount& actual, InvokeFlag flag, 321 const CallWrapper& call_wrapper); 322 323 void InvokeFunction(Handle<JSFunction> function, 324 const ParameterCount& expected, 325 const ParameterCount& actual, InvokeFlag flag, 326 const CallWrapper& call_wrapper); 327 328 // Invoke specified builtin JavaScript function. 329 void InvokeBuiltin(int native_context_index, InvokeFlag flag, 330 const CallWrapper& call_wrapper = NullCallWrapper()); 331 332 // Store the function for the given builtin in the target register. 333 void GetBuiltinFunction(Register target, int native_context_index); 334 335 336 // Expression support 337 // Support for constant splitting. 338 bool IsUnsafeImmediate(const Immediate& x); 339 void SafeMove(Register dst, const Immediate& x); 340 void SafePush(const Immediate& x); 341 342 // Compare object type for heap object. 343 // Incoming register is heap_object and outgoing register is map. 344 void CmpObjectType(Register heap_object, InstanceType type, Register map); 345 346 // Compare instance type for map. 347 void CmpInstanceType(Register map, InstanceType type); 348 349 // Check if a map for a JSObject indicates that the object has fast elements. 350 // Jump to the specified label if it does not. 351 void CheckFastElements(Register map, Label* fail, 352 Label::Distance distance = Label::kFar); 353 354 // Check if a map for a JSObject indicates that the object can have both smi 355 // and HeapObject elements. Jump to the specified label if it does not. 356 void CheckFastObjectElements(Register map, Label* fail, 357 Label::Distance distance = Label::kFar); 358 359 // Check if a map for a JSObject indicates that the object has fast smi only 360 // elements. Jump to the specified label if it does not. 361 void CheckFastSmiElements(Register map, Label* fail, 362 Label::Distance distance = Label::kFar); 363 364 // Check to see if maybe_number can be stored as a double in 365 // FastDoubleElements. If it can, store it at the index specified by key in 366 // the FastDoubleElements array elements, otherwise jump to fail. 367 void StoreNumberToDoubleElements(Register maybe_number, Register elements, 368 Register key, Register scratch, Label* fail, 369 int offset = 0); 370 371 // Compare an object's map with the specified map. 372 void CompareMap(Register obj, Handle<Map> map); 373 374 // Check if the map of an object is equal to a specified map and branch to 375 // label if not. Skip the smi check if not required (object is known to be a 376 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match 377 // against maps that are ElementsKind transition maps of the specified map. 378 void CheckMap(Register obj, Handle<Map> map, Label* fail, 379 SmiCheckType smi_check_type); 380 381 // Check if the map of an object is equal to a specified weak map and branch 382 // to a specified target if equal. Skip the smi check if not required 383 // (object is known to be a heap object) 384 void DispatchWeakMap(Register obj, Register scratch1, Register scratch2, 385 Handle<WeakCell> cell, Handle<Code> success, 386 SmiCheckType smi_check_type); 387 388 // Check if the object in register heap_object is a string. Afterwards the 389 // register map contains the object map and the register instance_type 390 // contains the instance_type. The registers map and instance_type can be the 391 // same in which case it contains the instance type afterwards. Either of the 392 // registers map and instance_type can be the same as heap_object. 393 Condition IsObjectStringType(Register heap_object, Register map, 394 Register instance_type); 395 396 // Check if the object in register heap_object is a name. Afterwards the 397 // register map contains the object map and the register instance_type 398 // contains the instance_type. The registers map and instance_type can be the 399 // same in which case it contains the instance type afterwards. Either of the 400 // registers map and instance_type can be the same as heap_object. 401 Condition IsObjectNameType(Register heap_object, Register map, 402 Register instance_type); 403 404 // FCmp is similar to integer cmp, but requires unsigned 405 // jcc instructions (je, ja, jae, jb, jbe, je, and jz). 406 void FCmp(); 407 void FXamMinusZero(); 408 void FXamSign(); 409 void X87CheckIA(); 410 void X87SetRC(int rc); 411 void X87SetFPUCW(int cw); 412 413 void ClampUint8(Register reg); 414 void ClampTOSToUint8(Register result_reg); 415 416 void SlowTruncateToI(Register result_reg, Register input_reg, 417 int offset = HeapNumber::kValueOffset - kHeapObjectTag); 418 419 void TruncateHeapNumberToI(Register result_reg, Register input_reg); 420 void TruncateX87TOSToI(Register result_reg); 421 422 void X87TOSToI(Register result_reg, MinusZeroMode minus_zero_mode, 423 Label* lost_precision, Label* is_nan, Label* minus_zero, 424 Label::Distance dst = Label::kFar); 425 426 // Smi tagging support. 427 void SmiTag(Register reg) { 428 STATIC_ASSERT(kSmiTag == 0); 429 STATIC_ASSERT(kSmiTagSize == 1); 430 add(reg, reg); 431 } 432 void SmiUntag(Register reg) { 433 sar(reg, kSmiTagSize); 434 } 435 436 // Modifies the register even if it does not contain a Smi! 437 void SmiUntag(Register reg, Label* is_smi) { 438 STATIC_ASSERT(kSmiTagSize == 1); 439 sar(reg, kSmiTagSize); 440 STATIC_ASSERT(kSmiTag == 0); 441 j(not_carry, is_smi); 442 } 443 444 void LoadUint32NoSSE2(Register src) { 445 LoadUint32NoSSE2(Operand(src)); 446 } 447 void LoadUint32NoSSE2(const Operand& src); 448 449 // Jump the register contains a smi. 450 inline void JumpIfSmi(Register value, Label* smi_label, 451 Label::Distance distance = Label::kFar) { 452 test(value, Immediate(kSmiTagMask)); 453 j(zero, smi_label, distance); 454 } 455 // Jump if the operand is a smi. 456 inline void JumpIfSmi(Operand value, Label* smi_label, 457 Label::Distance distance = Label::kFar) { 458 test(value, Immediate(kSmiTagMask)); 459 j(zero, smi_label, distance); 460 } 461 // Jump if register contain a non-smi. 462 inline void JumpIfNotSmi(Register value, Label* not_smi_label, 463 Label::Distance distance = Label::kFar) { 464 test(value, Immediate(kSmiTagMask)); 465 j(not_zero, not_smi_label, distance); 466 } 467 468 void LoadInstanceDescriptors(Register map, Register descriptors); 469 void EnumLength(Register dst, Register map); 470 void NumberOfOwnDescriptors(Register dst, Register map); 471 void LoadAccessor(Register dst, Register holder, int accessor_index, 472 AccessorComponent accessor); 473 474 template<typename Field> 475 void DecodeField(Register reg) { 476 static const int shift = Field::kShift; 477 static const int mask = Field::kMask >> Field::kShift; 478 if (shift != 0) { 479 sar(reg, shift); 480 } 481 and_(reg, Immediate(mask)); 482 } 483 484 template<typename Field> 485 void DecodeFieldToSmi(Register reg) { 486 static const int shift = Field::kShift; 487 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize; 488 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0); 489 STATIC_ASSERT(kSmiTag == 0); 490 if (shift < kSmiTagSize) { 491 shl(reg, kSmiTagSize - shift); 492 } else if (shift > kSmiTagSize) { 493 sar(reg, shift - kSmiTagSize); 494 } 495 and_(reg, Immediate(mask)); 496 } 497 498 // Abort execution if argument is not a number, enabled via --debug-code. 499 void AssertNumber(Register object); 500 501 // Abort execution if argument is not a smi, enabled via --debug-code. 502 void AssertSmi(Register object); 503 504 // Abort execution if argument is a smi, enabled via --debug-code. 505 void AssertNotSmi(Register object); 506 507 // Abort execution if argument is not a string, enabled via --debug-code. 508 void AssertString(Register object); 509 510 // Abort execution if argument is not a name, enabled via --debug-code. 511 void AssertName(Register object); 512 513 // Abort execution if argument is not a JSFunction, enabled via --debug-code. 514 void AssertFunction(Register object); 515 516 // Abort execution if argument is not a JSBoundFunction, 517 // enabled via --debug-code. 518 void AssertBoundFunction(Register object); 519 520 // Abort execution if argument is not undefined or an AllocationSite, enabled 521 // via --debug-code. 522 void AssertUndefinedOrAllocationSite(Register object); 523 524 // --------------------------------------------------------------------------- 525 // Exception handling 526 527 // Push a new stack handler and link it into stack handler chain. 528 void PushStackHandler(); 529 530 // Unlink the stack handler on top of the stack from the stack handler chain. 531 void PopStackHandler(); 532 533 // --------------------------------------------------------------------------- 534 // Inline caching support 535 536 // Generate code for checking access rights - used for security checks 537 // on access to global objects across environments. The holder register 538 // is left untouched, but the scratch register is clobbered. 539 void CheckAccessGlobalProxy(Register holder_reg, Register scratch1, 540 Register scratch2, Label* miss); 541 542 void GetNumberHash(Register r0, Register scratch); 543 544 void LoadFromNumberDictionary(Label* miss, Register elements, Register key, 545 Register r0, Register r1, Register r2, 546 Register result); 547 548 // --------------------------------------------------------------------------- 549 // Allocation support 550 551 // Allocate an object in new space or old space. If the given space 552 // is exhausted control continues at the gc_required label. The allocated 553 // object is returned in result and end of the new object is returned in 554 // result_end. The register scratch can be passed as no_reg in which case 555 // an additional object reference will be added to the reloc info. The 556 // returned pointers in result and result_end have not yet been tagged as 557 // heap objects. If result_contains_top_on_entry is true the content of 558 // result is known to be the allocation top on entry (could be result_end 559 // from a previous call). If result_contains_top_on_entry is true scratch 560 // should be no_reg as it is never used. 561 void Allocate(int object_size, Register result, Register result_end, 562 Register scratch, Label* gc_required, AllocationFlags flags); 563 564 void Allocate(int header_size, ScaleFactor element_size, 565 Register element_count, RegisterValueType element_count_type, 566 Register result, Register result_end, Register scratch, 567 Label* gc_required, AllocationFlags flags); 568 569 void Allocate(Register object_size, Register result, Register result_end, 570 Register scratch, Label* gc_required, AllocationFlags flags); 571 572 // Allocate a heap number in new space with undefined value. The 573 // register scratch2 can be passed as no_reg; the others must be 574 // valid registers. Returns tagged pointer in result register, or 575 // jumps to gc_required if new space is full. 576 void AllocateHeapNumber(Register result, Register scratch1, Register scratch2, 577 Label* gc_required, MutableMode mode = IMMUTABLE); 578 579 // Allocate a sequential string. All the header fields of the string object 580 // are initialized. 581 void AllocateTwoByteString(Register result, Register length, 582 Register scratch1, Register scratch2, 583 Register scratch3, Label* gc_required); 584 void AllocateOneByteString(Register result, Register length, 585 Register scratch1, Register scratch2, 586 Register scratch3, Label* gc_required); 587 void AllocateOneByteString(Register result, int length, Register scratch1, 588 Register scratch2, Label* gc_required); 589 590 // Allocate a raw cons string object. Only the map field of the result is 591 // initialized. 592 void AllocateTwoByteConsString(Register result, Register scratch1, 593 Register scratch2, Label* gc_required); 594 void AllocateOneByteConsString(Register result, Register scratch1, 595 Register scratch2, Label* gc_required); 596 597 // Allocate a raw sliced string object. Only the map field of the result is 598 // initialized. 599 void AllocateTwoByteSlicedString(Register result, Register scratch1, 600 Register scratch2, Label* gc_required); 601 void AllocateOneByteSlicedString(Register result, Register scratch1, 602 Register scratch2, Label* gc_required); 603 604 // Allocate and initialize a JSValue wrapper with the specified {constructor} 605 // and {value}. 606 void AllocateJSValue(Register result, Register constructor, Register value, 607 Register scratch, Label* gc_required); 608 609 // Copy memory, byte-by-byte, from source to destination. Not optimized for 610 // long or aligned copies. 611 // The contents of index and scratch are destroyed. 612 void CopyBytes(Register source, Register destination, Register length, 613 Register scratch); 614 615 // Initialize fields with filler values. Fields starting at |current_address| 616 // not including |end_address| are overwritten with the value in |filler|. At 617 // the end the loop, |current_address| takes the value of |end_address|. 618 void InitializeFieldsWithFiller(Register current_address, 619 Register end_address, Register filler); 620 621 // --------------------------------------------------------------------------- 622 // Support functions. 623 624 // Check a boolean-bit of a Smi field. 625 void BooleanBitTest(Register object, int field_offset, int bit_index); 626 627 // Check if result is zero and op is negative. 628 void NegativeZeroTest(Register result, Register op, Label* then_label); 629 630 // Check if result is zero and any of op1 and op2 are negative. 631 // Register scratch is destroyed, and it must be different from op2. 632 void NegativeZeroTest(Register result, Register op1, Register op2, 633 Register scratch, Label* then_label); 634 635 // Machine code version of Map::GetConstructor(). 636 // |temp| holds |result|'s map when done. 637 void GetMapConstructor(Register result, Register map, Register temp); 638 639 // Try to get function prototype of a function and puts the value in 640 // the result register. Checks that the function really is a 641 // function and jumps to the miss label if the fast checks fail. The 642 // function register will be untouched; the other registers may be 643 // clobbered. 644 void TryGetFunctionPrototype(Register function, Register result, 645 Register scratch, Label* miss); 646 647 // Picks out an array index from the hash field. 648 // Register use: 649 // hash - holds the index's hash. Clobbered. 650 // index - holds the overwritten index on exit. 651 void IndexFromHash(Register hash, Register index); 652 653 // --------------------------------------------------------------------------- 654 // Runtime calls 655 656 // Call a code stub. Generate the code if necessary. 657 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None()); 658 659 // Tail call a code stub (jump). Generate the code if necessary. 660 void TailCallStub(CodeStub* stub); 661 662 // Return from a code stub after popping its arguments. 663 void StubReturn(int argc); 664 665 // Call a runtime routine. 666 void CallRuntime(const Runtime::Function* f, int num_arguments, 667 SaveFPRegsMode save_doubles = kDontSaveFPRegs); 668 void CallRuntimeSaveDoubles(Runtime::FunctionId fid) { 669 const Runtime::Function* function = Runtime::FunctionForId(fid); 670 CallRuntime(function, function->nargs, kSaveFPRegs); 671 } 672 673 // Convenience function: Same as above, but takes the fid instead. 674 void CallRuntime(Runtime::FunctionId fid, 675 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 676 const Runtime::Function* function = Runtime::FunctionForId(fid); 677 CallRuntime(function, function->nargs, save_doubles); 678 } 679 680 // Convenience function: Same as above, but takes the fid instead. 681 void CallRuntime(Runtime::FunctionId fid, int num_arguments, 682 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 683 CallRuntime(Runtime::FunctionForId(fid), num_arguments, save_doubles); 684 } 685 686 // Convenience function: call an external reference. 687 void CallExternalReference(ExternalReference ref, int num_arguments); 688 689 // Convenience function: tail call a runtime routine (jump). 690 void TailCallRuntime(Runtime::FunctionId fid); 691 692 // Before calling a C-function from generated code, align arguments on stack. 693 // After aligning the frame, arguments must be stored in esp[0], esp[4], 694 // etc., not pushed. The argument count assumes all arguments are word sized. 695 // Some compilers/platforms require the stack to be aligned when calling 696 // C++ code. 697 // Needs a scratch register to do some arithmetic. This register will be 698 // trashed. 699 void PrepareCallCFunction(int num_arguments, Register scratch); 700 701 // Calls a C function and cleans up the space for arguments allocated 702 // by PrepareCallCFunction. The called function is not allowed to trigger a 703 // garbage collection, since that might move the code and invalidate the 704 // return address (unless this is somehow accounted for by the called 705 // function). 706 void CallCFunction(ExternalReference function, int num_arguments); 707 void CallCFunction(Register function, int num_arguments); 708 709 // Jump to a runtime routine. 710 void JumpToExternalReference(const ExternalReference& ext); 711 712 // --------------------------------------------------------------------------- 713 // Utilities 714 715 void Ret(); 716 717 // Return and drop arguments from stack, where the number of arguments 718 // may be bigger than 2^16 - 1. Requires a scratch register. 719 void Ret(int bytes_dropped, Register scratch); 720 721 // Emit code to discard a non-negative number of pointer-sized elements 722 // from the stack, clobbering only the esp register. 723 void Drop(int element_count); 724 725 void Call(Label* target) { call(target); } 726 void Call(Handle<Code> target, RelocInfo::Mode rmode) { call(target, rmode); } 727 void Jump(Handle<Code> target, RelocInfo::Mode rmode) { jmp(target, rmode); } 728 void Push(Register src) { push(src); } 729 void Push(const Operand& src) { push(src); } 730 void Push(Immediate value) { push(value); } 731 void Pop(Register dst) { pop(dst); } 732 void Pop(const Operand& dst) { pop(dst); } 733 void PushReturnAddressFrom(Register src) { push(src); } 734 void PopReturnAddressTo(Register dst) { pop(dst); } 735 736 void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); } 737 void Lzcnt(Register dst, const Operand& src); 738 739 void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); } 740 void Tzcnt(Register dst, const Operand& src); 741 742 void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); } 743 void Popcnt(Register dst, const Operand& src); 744 745 // Emit call to the code we are currently generating. 746 void CallSelf() { 747 Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location())); 748 call(self, RelocInfo::CODE_TARGET); 749 } 750 751 // Move if the registers are not identical. 752 void Move(Register target, Register source); 753 754 // Move a constant into a destination using the most efficient encoding. 755 void Move(Register dst, const Immediate& x); 756 void Move(const Operand& dst, const Immediate& x); 757 758 void Move(Register dst, Smi* source) { Move(dst, Immediate(source)); } 759 760 // Push a handle value. 761 void Push(Handle<Object> handle) { push(Immediate(handle)); } 762 void Push(Smi* smi) { Push(Immediate(smi)); } 763 764 Handle<Object> CodeObject() { 765 DCHECK(!code_object_.is_null()); 766 return code_object_; 767 } 768 769 // Insert code to verify that the x87 stack has the specified depth (0-7) 770 void VerifyX87StackDepth(uint32_t depth); 771 772 // Emit code for a truncating division by a constant. The dividend register is 773 // unchanged, the result is in edx, and eax gets clobbered. 774 void TruncatingDiv(Register dividend, int32_t divisor); 775 776 // --------------------------------------------------------------------------- 777 // StatsCounter support 778 779 void SetCounter(StatsCounter* counter, int value); 780 void IncrementCounter(StatsCounter* counter, int value); 781 void DecrementCounter(StatsCounter* counter, int value); 782 void IncrementCounter(Condition cc, StatsCounter* counter, int value); 783 void DecrementCounter(Condition cc, StatsCounter* counter, int value); 784 785 // --------------------------------------------------------------------------- 786 // Debugging 787 788 // Calls Abort(msg) if the condition cc is not satisfied. 789 // Use --debug_code to enable. 790 void Assert(Condition cc, BailoutReason reason); 791 792 void AssertFastElements(Register elements); 793 794 // Like Assert(), but always enabled. 795 void Check(Condition cc, BailoutReason reason); 796 797 // Print a message to stdout and abort execution. 798 void Abort(BailoutReason reason); 799 800 // Check that the stack is aligned. 801 void CheckStackAlignment(); 802 803 // Verify restrictions about code generated in stubs. 804 void set_generating_stub(bool value) { generating_stub_ = value; } 805 bool generating_stub() { return generating_stub_; } 806 void set_has_frame(bool value) { has_frame_ = value; } 807 bool has_frame() { return has_frame_; } 808 inline bool AllowThisStubCall(CodeStub* stub); 809 810 // --------------------------------------------------------------------------- 811 // String utilities. 812 813 // Check whether the instance type represents a flat one-byte string. Jump to 814 // the label if not. If the instance type can be scratched specify same 815 // register for both instance type and scratch. 816 void JumpIfInstanceTypeIsNotSequentialOneByte( 817 Register instance_type, Register scratch, 818 Label* on_not_flat_one_byte_string); 819 820 // Checks if both objects are sequential one-byte strings, and jumps to label 821 // if either is not. 822 void JumpIfNotBothSequentialOneByteStrings( 823 Register object1, Register object2, Register scratch1, Register scratch2, 824 Label* on_not_flat_one_byte_strings); 825 826 // Checks if the given register or operand is a unique name 827 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name, 828 Label::Distance distance = Label::kFar) { 829 JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance); 830 } 831 832 void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name, 833 Label::Distance distance = Label::kFar); 834 835 void EmitSeqStringSetCharCheck(Register string, Register index, 836 Register value, uint32_t encoding_mask); 837 838 static int SafepointRegisterStackIndex(Register reg) { 839 return SafepointRegisterStackIndex(reg.code()); 840 } 841 842 // Load the type feedback vector from a JavaScript frame. 843 void EmitLoadTypeFeedbackVector(Register vector); 844 845 // Activation support. 846 void EnterFrame(StackFrame::Type type); 847 void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg); 848 void LeaveFrame(StackFrame::Type type); 849 850 // Expects object in eax and returns map with validated enum cache 851 // in eax. Assumes that any other register can be used as a scratch. 852 void CheckEnumCache(Label* call_runtime); 853 854 // AllocationMemento support. Arrays may have an associated 855 // AllocationMemento object that can be checked for in order to pretransition 856 // to another type. 857 // On entry, receiver_reg should point to the array object. 858 // scratch_reg gets clobbered. 859 // If allocation info is present, conditional code is set to equal. 860 void TestJSArrayForAllocationMemento(Register receiver_reg, 861 Register scratch_reg, 862 Label* no_memento_found); 863 864 void JumpIfJSArrayHasAllocationMemento(Register receiver_reg, 865 Register scratch_reg, 866 Label* memento_found) { 867 Label no_memento_found; 868 TestJSArrayForAllocationMemento(receiver_reg, scratch_reg, 869 &no_memento_found); 870 j(equal, memento_found); 871 bind(&no_memento_found); 872 } 873 874 // Jumps to found label if a prototype map has dictionary elements. 875 void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0, 876 Register scratch1, Label* found); 877 878 private: 879 bool generating_stub_; 880 bool has_frame_; 881 // This handle will be patched with the code object on installation. 882 Handle<Object> code_object_; 883 884 // Helper functions for generating invokes. 885 void InvokePrologue(const ParameterCount& expected, 886 const ParameterCount& actual, Label* done, 887 bool* definitely_mismatches, InvokeFlag flag, 888 Label::Distance done_distance, 889 const CallWrapper& call_wrapper); 890 891 void EnterExitFramePrologue(); 892 void EnterExitFrameEpilogue(int argc, bool save_doubles); 893 894 void LeaveExitFrameEpilogue(bool restore_context); 895 896 // Allocation support helpers. 897 void LoadAllocationTopHelper(Register result, Register scratch, 898 AllocationFlags flags); 899 900 void UpdateAllocationTopHelper(Register result_end, Register scratch, 901 AllocationFlags flags); 902 903 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace. 904 void InNewSpace(Register object, Register scratch, Condition cc, 905 Label* condition_met, 906 Label::Distance condition_met_distance = Label::kFar); 907 908 // Helper for finding the mark bits for an address. Afterwards, the 909 // bitmap register points at the word with the mark bits and the mask 910 // the position of the first bit. Uses ecx as scratch and leaves addr_reg 911 // unchanged. 912 inline void GetMarkBits(Register addr_reg, Register bitmap_reg, 913 Register mask_reg); 914 915 // Compute memory operands for safepoint stack slots. 916 Operand SafepointRegisterSlot(Register reg); 917 static int SafepointRegisterStackIndex(int reg_code); 918 919 // Needs access to SafepointRegisterStackIndex for compiled frame 920 // traversal. 921 friend class StandardFrame; 922 }; 923 924 // The code patcher is used to patch (typically) small parts of code e.g. for 925 // debugging and other types of instrumentation. When using the code patcher 926 // the exact number of bytes specified must be emitted. Is not legal to emit 927 // relocation information. If any of these constraints are violated it causes 928 // an assertion. 929 class CodePatcher { 930 public: 931 CodePatcher(Isolate* isolate, byte* address, int size); 932 ~CodePatcher(); 933 934 // Macro assembler to emit code. 935 MacroAssembler* masm() { return &masm_; } 936 937 private: 938 byte* address_; // The address of the code being patched. 939 int size_; // Number of bytes of the expected patch size. 940 MacroAssembler masm_; // Macro assembler used to generate the code. 941 }; 942 943 // ----------------------------------------------------------------------------- 944 // Static helper functions. 945 946 // Generate an Operand for loading a field from an object. 947 inline Operand FieldOperand(Register object, int offset) { 948 return Operand(object, offset - kHeapObjectTag); 949 } 950 951 // Generate an Operand for loading an indexed field from an object. 952 inline Operand FieldOperand(Register object, Register index, ScaleFactor scale, 953 int offset) { 954 return Operand(object, index, scale, offset - kHeapObjectTag); 955 } 956 957 inline Operand FixedArrayElementOperand(Register array, Register index_as_smi, 958 int additional_offset = 0) { 959 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize; 960 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset); 961 } 962 963 inline Operand ContextOperand(Register context, int index) { 964 return Operand(context, Context::SlotOffset(index)); 965 } 966 967 inline Operand ContextOperand(Register context, Register index) { 968 return Operand(context, index, times_pointer_size, Context::SlotOffset(0)); 969 } 970 971 inline Operand NativeContextOperand() { 972 return ContextOperand(esi, Context::NATIVE_CONTEXT_INDEX); 973 } 974 975 #ifdef GENERATED_CODE_COVERAGE 976 extern void LogGeneratedCodeCoverage(const char* file_line); 977 #define CODE_COVERAGE_STRINGIFY(x) #x 978 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) 979 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) 980 #define ACCESS_MASM(masm) { \ 981 byte* ia32_coverage_function = \ 982 reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \ 983 masm->pushfd(); \ 984 masm->pushad(); \ 985 masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \ 986 masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \ 987 masm->pop(eax); \ 988 masm->popad(); \ 989 masm->popfd(); \ 990 } \ 991 masm-> 992 #else 993 #define ACCESS_MASM(masm) masm-> 994 #endif 995 996 } // namespace internal 997 } // namespace v8 998 999 #endif // V8_X87_MACRO_ASSEMBLER_X87_H_ 1000
