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 13namespace v8 { 14namespace internal { 15 16// Give alias names to registers for calling conventions. 17const Register kReturnRegister0 = {Register::kCode_eax}; 18const Register kReturnRegister1 = {Register::kCode_edx}; 19const Register kReturnRegister2 = {Register::kCode_edi}; 20const Register kJSFunctionRegister = {Register::kCode_edi}; 21const Register kContextRegister = {Register::kCode_esi}; 22const Register kAllocateSizeRegister = {Register::kCode_edx}; 23const Register kInterpreterAccumulatorRegister = {Register::kCode_eax}; 24const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx}; 25const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi}; 26const Register kInterpreterDispatchTableRegister = {Register::kCode_esi}; 27const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax}; 28const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx}; 29const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx}; 30const Register kRuntimeCallArgCountRegister = {Register::kCode_eax}; 31 32// Convenience for platform-independent signatures. We do not normally 33// distinguish memory operands from other operands on ia32. 34typedef Operand MemOperand; 35 36enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET }; 37enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK }; 38enum PointersToHereCheck { 39 kPointersToHereMaybeInteresting, 40 kPointersToHereAreAlwaysInteresting 41}; 42 43enum RegisterValueType { REGISTER_VALUE_IS_SMI, REGISTER_VALUE_IS_INT32 }; 44 45enum class ReturnAddressState { kOnStack, kNotOnStack }; 46 47#ifdef DEBUG 48bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg, 49 Register reg4 = no_reg, Register reg5 = no_reg, 50 Register reg6 = no_reg, Register reg7 = no_reg, 51 Register reg8 = no_reg); 52#endif 53 54// MacroAssembler implements a collection of frequently used macros. 55class MacroAssembler: public Assembler { 56 public: 57 MacroAssembler(Isolate* isolate, void* buffer, int size, 58 CodeObjectRequired create_code_object); 59 60 void Load(Register dst, const Operand& src, Representation r); 61 void Store(Register src, const Operand& dst, Representation r); 62 63 // Load a register with a long value as efficiently as possible. 64 void Set(Register dst, int32_t x) { 65 if (x == 0) { 66 xor_(dst, dst); 67 } else { 68 mov(dst, Immediate(x)); 69 } 70 } 71 void Set(const Operand& dst, int32_t x) { mov(dst, Immediate(x)); } 72 73 // Operations on roots in the root-array. 74 void LoadRoot(Register destination, Heap::RootListIndex index); 75 void StoreRoot(Register source, Register scratch, Heap::RootListIndex index); 76 void CompareRoot(Register with, Register scratch, Heap::RootListIndex index); 77 // These methods can only be used with constant roots (i.e. non-writable 78 // and not in new space). 79 void CompareRoot(Register with, Heap::RootListIndex index); 80 void CompareRoot(const Operand& with, Heap::RootListIndex index); 81 void PushRoot(Heap::RootListIndex index); 82 83 // Compare the object in a register to a value and jump if they are equal. 84 void JumpIfRoot(Register with, Heap::RootListIndex index, Label* if_equal, 85 Label::Distance if_equal_distance = Label::kFar) { 86 CompareRoot(with, index); 87 j(equal, if_equal, if_equal_distance); 88 } 89 void JumpIfRoot(const Operand& with, Heap::RootListIndex index, 90 Label* if_equal, 91 Label::Distance if_equal_distance = Label::kFar) { 92 CompareRoot(with, index); 93 j(equal, if_equal, if_equal_distance); 94 } 95 96 // Compare the object in a register to a value and jump if they are not equal. 97 void JumpIfNotRoot(Register with, Heap::RootListIndex index, 98 Label* if_not_equal, 99 Label::Distance if_not_equal_distance = Label::kFar) { 100 CompareRoot(with, index); 101 j(not_equal, if_not_equal, if_not_equal_distance); 102 } 103 void JumpIfNotRoot(const Operand& with, Heap::RootListIndex index, 104 Label* if_not_equal, 105 Label::Distance if_not_equal_distance = Label::kFar) { 106 CompareRoot(with, index); 107 j(not_equal, if_not_equal, if_not_equal_distance); 108 } 109 110 // These functions do not arrange the registers in any particular order so 111 // they are not useful for calls that can cause a GC. The caller can 112 // exclude up to 3 registers that do not need to be saved and restored. 113 void PushCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg, 114 Register exclusion2 = no_reg, 115 Register exclusion3 = no_reg); 116 void PopCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg, 117 Register exclusion2 = no_reg, 118 Register exclusion3 = no_reg); 119 120 // --------------------------------------------------------------------------- 121 // GC Support 122 enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd }; 123 124 // Record in the remembered set the fact that we have a pointer to new space 125 // at the address pointed to by the addr register. Only works if addr is not 126 // in new space. 127 void RememberedSetHelper(Register object, // Used for debug code. 128 Register addr, Register scratch, 129 SaveFPRegsMode save_fp, 130 RememberedSetFinalAction and_then); 131 132 void CheckPageFlag(Register object, Register scratch, int mask, Condition cc, 133 Label* condition_met, 134 Label::Distance condition_met_distance = Label::kFar); 135 136 void CheckPageFlagForMap( 137 Handle<Map> map, int mask, Condition cc, Label* condition_met, 138 Label::Distance condition_met_distance = Label::kFar); 139 140 // Check if object is in new space. Jumps if the object is not in new space. 141 // The register scratch can be object itself, but scratch will be clobbered. 142 void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch, 143 Label::Distance distance = Label::kFar) { 144 InNewSpace(object, scratch, zero, branch, distance); 145 } 146 147 // Check if object is in new space. Jumps if the object is in new space. 148 // The register scratch can be object itself, but it will be clobbered. 149 void JumpIfInNewSpace(Register object, Register scratch, Label* branch, 150 Label::Distance distance = Label::kFar) { 151 InNewSpace(object, scratch, not_zero, branch, distance); 152 } 153 154 // Check if an object has a given incremental marking color. Also uses ecx! 155 void HasColor(Register object, Register scratch0, Register scratch1, 156 Label* has_color, Label::Distance has_color_distance, 157 int first_bit, int second_bit); 158 159 void JumpIfBlack(Register object, Register scratch0, Register scratch1, 160 Label* on_black, 161 Label::Distance on_black_distance = Label::kFar); 162 163 // Checks the color of an object. If the object is white we jump to the 164 // incremental marker. 165 void JumpIfWhite(Register value, Register scratch1, Register scratch2, 166 Label* value_is_white, Label::Distance distance); 167 168 // Notify the garbage collector that we wrote a pointer into an object. 169 // |object| is the object being stored into, |value| is the object being 170 // stored. value and scratch registers are clobbered by the operation. 171 // The offset is the offset from the start of the object, not the offset from 172 // the tagged HeapObject pointer. For use with FieldOperand(reg, off). 173 void RecordWriteField( 174 Register object, int offset, Register value, Register scratch, 175 SaveFPRegsMode save_fp, 176 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 177 SmiCheck smi_check = INLINE_SMI_CHECK, 178 PointersToHereCheck pointers_to_here_check_for_value = 179 kPointersToHereMaybeInteresting); 180 181 // As above, but the offset has the tag presubtracted. For use with 182 // Operand(reg, off). 183 void RecordWriteContextSlot( 184 Register context, int offset, Register value, Register scratch, 185 SaveFPRegsMode save_fp, 186 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 187 SmiCheck smi_check = INLINE_SMI_CHECK, 188 PointersToHereCheck pointers_to_here_check_for_value = 189 kPointersToHereMaybeInteresting) { 190 RecordWriteField(context, offset + kHeapObjectTag, value, scratch, save_fp, 191 remembered_set_action, smi_check, 192 pointers_to_here_check_for_value); 193 } 194 195 // Notify the garbage collector that we wrote a pointer into a fixed array. 196 // |array| is the array being stored into, |value| is the 197 // object being stored. |index| is the array index represented as a 198 // Smi. All registers are clobbered by the operation RecordWriteArray 199 // filters out smis so it does not update the write barrier if the 200 // value is a smi. 201 void RecordWriteArray( 202 Register array, Register value, Register index, SaveFPRegsMode save_fp, 203 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 204 SmiCheck smi_check = INLINE_SMI_CHECK, 205 PointersToHereCheck pointers_to_here_check_for_value = 206 kPointersToHereMaybeInteresting); 207 208 // For page containing |object| mark region covering |address| 209 // dirty. |object| is the object being stored into, |value| is the 210 // object being stored. The address and value registers are clobbered by the 211 // operation. RecordWrite filters out smis so it does not update the 212 // write barrier if the value is a smi. 213 void RecordWrite( 214 Register object, Register address, Register value, SaveFPRegsMode save_fp, 215 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, 216 SmiCheck smi_check = INLINE_SMI_CHECK, 217 PointersToHereCheck pointers_to_here_check_for_value = 218 kPointersToHereMaybeInteresting); 219 220 // Notify the garbage collector that we wrote a code entry into a 221 // JSFunction. Only scratch is clobbered by the operation. 222 void RecordWriteCodeEntryField(Register js_function, Register code_entry, 223 Register scratch); 224 225 // For page containing |object| mark the region covering the object's map 226 // dirty. |object| is the object being stored into, |map| is the Map object 227 // that was stored. 228 void RecordWriteForMap(Register object, Handle<Map> map, Register scratch1, 229 Register scratch2, SaveFPRegsMode save_fp); 230 231 // Frame restart support 232 void MaybeDropFrames(); 233 234 // Generates function and stub prologue code. 235 void StubPrologue(StackFrame::Type type); 236 void Prologue(bool code_pre_aging); 237 238 // Enter specific kind of exit frame. Expects the number of 239 // arguments in register eax and sets up the number of arguments in 240 // register edi and the pointer to the first argument in register 241 // esi. 242 void EnterExitFrame(int argc, bool save_doubles, StackFrame::Type frame_type); 243 244 void EnterApiExitFrame(int argc); 245 246 // Leave the current exit frame. Expects the return value in 247 // register eax:edx (untouched) and the pointer to the first 248 // argument in register esi (if pop_arguments == true). 249 void LeaveExitFrame(bool save_doubles, bool pop_arguments = true); 250 251 // Leave the current exit frame. Expects the return value in 252 // register eax (untouched). 253 void LeaveApiExitFrame(bool restore_context); 254 255 // Find the function context up the context chain. 256 void LoadContext(Register dst, int context_chain_length); 257 258 // Load the global proxy from the current context. 259 void LoadGlobalProxy(Register dst); 260 261 // Load the global function with the given index. 262 void LoadGlobalFunction(int index, Register function); 263 264 // Load the initial map from the global function. The registers 265 // function and map can be the same. 266 void LoadGlobalFunctionInitialMap(Register function, Register map); 267 268 // Push and pop the registers that can hold pointers. 269 void PushSafepointRegisters() { pushad(); } 270 void PopSafepointRegisters() { popad(); } 271 // Store the value in register/immediate src in the safepoint 272 // register stack slot for register dst. 273 void StoreToSafepointRegisterSlot(Register dst, Register src); 274 void StoreToSafepointRegisterSlot(Register dst, Immediate src); 275 void LoadFromSafepointRegisterSlot(Register dst, Register src); 276 277 // Nop, because ia32 does not have a root register. 278 void InitializeRootRegister() {} 279 280 void LoadHeapObject(Register result, Handle<HeapObject> object); 281 void CmpHeapObject(Register reg, Handle<HeapObject> object); 282 void PushHeapObject(Handle<HeapObject> object); 283 284 void LoadObject(Register result, Handle<Object> object) { 285 AllowDeferredHandleDereference heap_object_check; 286 if (object->IsHeapObject()) { 287 LoadHeapObject(result, Handle<HeapObject>::cast(object)); 288 } else { 289 Move(result, Immediate(object)); 290 } 291 } 292 293 void CmpObject(Register reg, Handle<Object> object) { 294 AllowDeferredHandleDereference heap_object_check; 295 if (object->IsHeapObject()) { 296 CmpHeapObject(reg, Handle<HeapObject>::cast(object)); 297 } else { 298 cmp(reg, Immediate(object)); 299 } 300 } 301 302 // Compare the given value and the value of weak cell. 303 void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch); 304 305 void GetWeakValue(Register value, Handle<WeakCell> cell); 306 307 // Load the value of the weak cell in the value register. Branch to the given 308 // miss label if the weak cell was cleared. 309 void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss); 310 311 // --------------------------------------------------------------------------- 312 // JavaScript invokes 313 314 // Removes current frame and its arguments from the stack preserving 315 // the arguments and a return address pushed to the stack for the next call. 316 // |ra_state| defines whether return address is already pushed to stack or 317 // not. Both |callee_args_count| and |caller_args_count_reg| do not include 318 // receiver. |callee_args_count| is not modified, |caller_args_count_reg| 319 // is trashed. |number_of_temp_values_after_return_address| specifies 320 // the number of words pushed to the stack after the return address. This is 321 // to allow "allocation" of scratch registers that this function requires 322 // by saving their values on the stack. 323 void PrepareForTailCall(const ParameterCount& callee_args_count, 324 Register caller_args_count_reg, Register scratch0, 325 Register scratch1, ReturnAddressState ra_state, 326 int number_of_temp_values_after_return_address); 327 328 // Invoke the JavaScript function code by either calling or jumping. 329 330 void InvokeFunctionCode(Register function, Register new_target, 331 const ParameterCount& expected, 332 const ParameterCount& actual, InvokeFlag flag, 333 const CallWrapper& call_wrapper); 334 335 // On function call, call into the debugger if necessary. 336 void CheckDebugHook(Register fun, Register new_target, 337 const ParameterCount& expected, 338 const ParameterCount& actual); 339 340 // Invoke the JavaScript function in the given register. Changes the 341 // current context to the context in the function before invoking. 342 void InvokeFunction(Register function, Register new_target, 343 const ParameterCount& actual, InvokeFlag flag, 344 const CallWrapper& call_wrapper); 345 346 void InvokeFunction(Register function, const ParameterCount& expected, 347 const ParameterCount& actual, InvokeFlag flag, 348 const CallWrapper& call_wrapper); 349 350 void InvokeFunction(Handle<JSFunction> function, 351 const ParameterCount& expected, 352 const ParameterCount& actual, InvokeFlag flag, 353 const CallWrapper& call_wrapper); 354 355 // Expression support 356 // cvtsi2sd instruction only writes to the low 64-bit of dst register, which 357 // hinders register renaming and makes dependence chains longer. So we use 358 // xorps to clear the dst register before cvtsi2sd to solve this issue. 359 void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); } 360 void Cvtsi2sd(XMMRegister dst, const Operand& src); 361 362 void Cvtui2ss(XMMRegister dst, Register src, Register tmp); 363 364 void ShlPair(Register high, Register low, uint8_t imm8); 365 void ShlPair_cl(Register high, Register low); 366 void ShrPair(Register high, Register low, uint8_t imm8); 367 void ShrPair_cl(Register high, Register src); 368 void SarPair(Register high, Register low, uint8_t imm8); 369 void SarPair_cl(Register high, Register low); 370 371 // Support for constant splitting. 372 bool IsUnsafeImmediate(const Immediate& x); 373 void SafeMove(Register dst, const Immediate& x); 374 void SafePush(const Immediate& x); 375 376 // Compare object type for heap object. 377 // Incoming register is heap_object and outgoing register is map. 378 void CmpObjectType(Register heap_object, InstanceType type, Register map); 379 380 // Compare instance type for map. 381 void CmpInstanceType(Register map, InstanceType type); 382 383 // Compare an object's map with the specified map. 384 void CompareMap(Register obj, Handle<Map> map); 385 386 // Check if the map of an object is equal to a specified map and branch to 387 // label if not. Skip the smi check if not required (object is known to be a 388 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match 389 // against maps that are ElementsKind transition maps of the specified map. 390 void CheckMap(Register obj, Handle<Map> map, Label* fail, 391 SmiCheckType smi_check_type); 392 393 // Check if the map of an object is equal to a specified weak map and branch 394 // to a specified target if equal. Skip the smi check if not required 395 // (object is known to be a heap object) 396 void DispatchWeakMap(Register obj, Register scratch1, Register scratch2, 397 Handle<WeakCell> cell, Handle<Code> success, 398 SmiCheckType smi_check_type); 399 400 // Check if the object in register heap_object is a string. Afterwards the 401 // register map contains the object map and the register instance_type 402 // contains the instance_type. The registers map and instance_type can be the 403 // same in which case it contains the instance type afterwards. Either of the 404 // registers map and instance_type can be the same as heap_object. 405 Condition IsObjectStringType(Register heap_object, Register map, 406 Register instance_type); 407 408 // Check if the object in register heap_object is a name. Afterwards the 409 // register map contains the object map and the register instance_type 410 // contains the instance_type. The registers map and instance_type can be the 411 // same in which case it contains the instance type afterwards. Either of the 412 // registers map and instance_type can be the same as heap_object. 413 Condition IsObjectNameType(Register heap_object, Register map, 414 Register instance_type); 415 416 // FCmp is similar to integer cmp, but requires unsigned 417 // jcc instructions (je, ja, jae, jb, jbe, je, and jz). 418 void FCmp(); 419 420 void ClampUint8(Register reg); 421 422 void ClampDoubleToUint8(XMMRegister input_reg, XMMRegister scratch_reg, 423 Register result_reg); 424 425 void SlowTruncateToI(Register result_reg, Register input_reg, 426 int offset = HeapNumber::kValueOffset - kHeapObjectTag); 427 428 void TruncateHeapNumberToI(Register result_reg, Register input_reg); 429 void TruncateDoubleToI(Register result_reg, XMMRegister input_reg); 430 431 void DoubleToI(Register result_reg, XMMRegister input_reg, 432 XMMRegister scratch, MinusZeroMode minus_zero_mode, 433 Label* lost_precision, Label* is_nan, Label* minus_zero, 434 Label::Distance dst = Label::kFar); 435 436 // Smi tagging support. 437 void SmiTag(Register reg) { 438 STATIC_ASSERT(kSmiTag == 0); 439 STATIC_ASSERT(kSmiTagSize == 1); 440 add(reg, reg); 441 } 442 void SmiUntag(Register reg) { 443 sar(reg, kSmiTagSize); 444 } 445 446 // Modifies the register even if it does not contain a Smi! 447 void SmiUntag(Register reg, Label* is_smi) { 448 STATIC_ASSERT(kSmiTagSize == 1); 449 sar(reg, kSmiTagSize); 450 STATIC_ASSERT(kSmiTag == 0); 451 j(not_carry, is_smi); 452 } 453 454 void LoadUint32(XMMRegister dst, Register src) { 455 LoadUint32(dst, Operand(src)); 456 } 457 void LoadUint32(XMMRegister dst, const Operand& src); 458 459 // Jump the register contains a smi. 460 inline void JumpIfSmi(Register value, Label* smi_label, 461 Label::Distance distance = Label::kFar) { 462 test(value, Immediate(kSmiTagMask)); 463 j(zero, smi_label, distance); 464 } 465 // Jump if the operand is a smi. 466 inline void JumpIfSmi(Operand value, Label* smi_label, 467 Label::Distance distance = Label::kFar) { 468 test(value, Immediate(kSmiTagMask)); 469 j(zero, smi_label, distance); 470 } 471 // Jump if register contain a non-smi. 472 inline void JumpIfNotSmi(Register value, Label* not_smi_label, 473 Label::Distance distance = Label::kFar) { 474 test(value, Immediate(kSmiTagMask)); 475 j(not_zero, not_smi_label, distance); 476 } 477 // Jump if the operand is not a smi. 478 inline void JumpIfNotSmi(Operand value, Label* smi_label, 479 Label::Distance distance = Label::kFar) { 480 test(value, Immediate(kSmiTagMask)); 481 j(not_zero, smi_label, distance); 482 } 483 // Jump if the value cannot be represented by a smi. 484 inline void JumpIfNotValidSmiValue(Register value, Register scratch, 485 Label* on_invalid, 486 Label::Distance distance = Label::kFar) { 487 mov(scratch, value); 488 add(scratch, Immediate(0x40000000U)); 489 j(sign, on_invalid, distance); 490 } 491 492 // Jump if the unsigned integer value cannot be represented by a smi. 493 inline void JumpIfUIntNotValidSmiValue( 494 Register value, Label* on_invalid, 495 Label::Distance distance = Label::kFar) { 496 cmp(value, Immediate(0x40000000U)); 497 j(above_equal, on_invalid, distance); 498 } 499 500 void LoadInstanceDescriptors(Register map, Register descriptors); 501 void EnumLength(Register dst, Register map); 502 void NumberOfOwnDescriptors(Register dst, Register map); 503 void LoadAccessor(Register dst, Register holder, int accessor_index, 504 AccessorComponent accessor); 505 506 template<typename Field> 507 void DecodeField(Register reg) { 508 static const int shift = Field::kShift; 509 static const int mask = Field::kMask >> Field::kShift; 510 if (shift != 0) { 511 sar(reg, shift); 512 } 513 and_(reg, Immediate(mask)); 514 } 515 516 template<typename Field> 517 void DecodeFieldToSmi(Register reg) { 518 static const int shift = Field::kShift; 519 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize; 520 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0); 521 STATIC_ASSERT(kSmiTag == 0); 522 if (shift < kSmiTagSize) { 523 shl(reg, kSmiTagSize - shift); 524 } else if (shift > kSmiTagSize) { 525 sar(reg, shift - kSmiTagSize); 526 } 527 and_(reg, Immediate(mask)); 528 } 529 530 void LoadPowerOf2(XMMRegister dst, Register scratch, int power); 531 532 // Abort execution if argument is not a number, enabled via --debug-code. 533 void AssertNumber(Register object); 534 void AssertNotNumber(Register object); 535 536 // Abort execution if argument is not a smi, enabled via --debug-code. 537 void AssertSmi(Register object); 538 539 // Abort execution if argument is a smi, enabled via --debug-code. 540 void AssertNotSmi(Register object); 541 542 // Abort execution if argument is not a string, enabled via --debug-code. 543 void AssertString(Register object); 544 545 // Abort execution if argument is not a name, enabled via --debug-code. 546 void AssertName(Register object); 547 548 // Abort execution if argument is not a JSFunction, enabled via --debug-code. 549 void AssertFunction(Register object); 550 551 // Abort execution if argument is not a JSBoundFunction, 552 // enabled via --debug-code. 553 void AssertBoundFunction(Register object); 554 555 // Abort execution if argument is not a JSGeneratorObject, 556 // enabled via --debug-code. 557 void AssertGeneratorObject(Register object); 558 559 // Abort execution if argument is not a JSReceiver, enabled via --debug-code. 560 void AssertReceiver(Register object); 561 562 // Abort execution if argument is not undefined or an AllocationSite, enabled 563 // via --debug-code. 564 void AssertUndefinedOrAllocationSite(Register object); 565 566 // --------------------------------------------------------------------------- 567 // Exception handling 568 569 // Push a new stack handler and link it into stack handler chain. 570 void PushStackHandler(); 571 572 // Unlink the stack handler on top of the stack from the stack handler chain. 573 void PopStackHandler(); 574 575 // --------------------------------------------------------------------------- 576 // Inline caching support 577 578 void GetNumberHash(Register r0, Register scratch); 579 580 // --------------------------------------------------------------------------- 581 // Allocation support 582 583 // Allocate an object in new space or old space. If the given space 584 // is exhausted control continues at the gc_required label. The allocated 585 // object is returned in result and end of the new object is returned in 586 // result_end. The register scratch can be passed as no_reg in which case 587 // an additional object reference will be added to the reloc info. The 588 // returned pointers in result and result_end have not yet been tagged as 589 // heap objects. If result_contains_top_on_entry is true the content of 590 // result is known to be the allocation top on entry (could be result_end 591 // from a previous call). If result_contains_top_on_entry is true scratch 592 // should be no_reg as it is never used. 593 void Allocate(int object_size, Register result, Register result_end, 594 Register scratch, Label* gc_required, AllocationFlags flags); 595 596 void Allocate(int header_size, ScaleFactor element_size, 597 Register element_count, RegisterValueType element_count_type, 598 Register result, Register result_end, Register scratch, 599 Label* gc_required, AllocationFlags flags); 600 601 void Allocate(Register object_size, Register result, Register result_end, 602 Register scratch, Label* gc_required, AllocationFlags flags); 603 604 // FastAllocate is right now only used for folded allocations. It just 605 // increments the top pointer without checking against limit. This can only 606 // be done if it was proved earlier that the allocation will succeed. 607 void FastAllocate(int object_size, Register result, Register result_end, 608 AllocationFlags flags); 609 void FastAllocate(Register object_size, Register result, Register result_end, 610 AllocationFlags flags); 611 612 // Allocate a heap number in new space with undefined value. The 613 // register scratch2 can be passed as no_reg; the others must be 614 // valid registers. Returns tagged pointer in result register, or 615 // jumps to gc_required if new space is full. 616 void AllocateHeapNumber(Register result, Register scratch1, Register scratch2, 617 Label* gc_required, MutableMode mode = IMMUTABLE); 618 619 // Allocate and initialize a JSValue wrapper with the specified {constructor} 620 // and {value}. 621 void AllocateJSValue(Register result, Register constructor, Register value, 622 Register scratch, Label* gc_required); 623 624 // Initialize fields with filler values. Fields starting at |current_address| 625 // not including |end_address| are overwritten with the value in |filler|. At 626 // the end the loop, |current_address| takes the value of |end_address|. 627 void InitializeFieldsWithFiller(Register current_address, 628 Register end_address, Register filler); 629 630 // --------------------------------------------------------------------------- 631 // Support functions. 632 633 // Check a boolean-bit of a Smi field. 634 void BooleanBitTest(Register object, int field_offset, int bit_index); 635 636 // Check if result is zero and op is negative. 637 void NegativeZeroTest(Register result, Register op, Label* then_label); 638 639 // Check if result is zero and any of op1 and op2 are negative. 640 // Register scratch is destroyed, and it must be different from op2. 641 void NegativeZeroTest(Register result, Register op1, Register op2, 642 Register scratch, Label* then_label); 643 644 // Machine code version of Map::GetConstructor(). 645 // |temp| holds |result|'s map when done. 646 void GetMapConstructor(Register result, Register map, Register temp); 647 648 // --------------------------------------------------------------------------- 649 // Runtime calls 650 651 // Call a code stub. Generate the code if necessary. 652 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None()); 653 654 // Tail call a code stub (jump). Generate the code if necessary. 655 void TailCallStub(CodeStub* stub); 656 657 // Return from a code stub after popping its arguments. 658 void StubReturn(int argc); 659 660 // Call a runtime routine. 661 void CallRuntime(const Runtime::Function* f, int num_arguments, 662 SaveFPRegsMode save_doubles = kDontSaveFPRegs); 663 void CallRuntimeSaveDoubles(Runtime::FunctionId fid) { 664 const Runtime::Function* function = Runtime::FunctionForId(fid); 665 CallRuntime(function, function->nargs, kSaveFPRegs); 666 } 667 668 // Convenience function: Same as above, but takes the fid instead. 669 void CallRuntime(Runtime::FunctionId fid, 670 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 671 const Runtime::Function* function = Runtime::FunctionForId(fid); 672 CallRuntime(function, function->nargs, save_doubles); 673 } 674 675 // Convenience function: Same as above, but takes the fid instead. 676 void CallRuntime(Runtime::FunctionId fid, int num_arguments, 677 SaveFPRegsMode save_doubles = kDontSaveFPRegs) { 678 CallRuntime(Runtime::FunctionForId(fid), num_arguments, save_doubles); 679 } 680 681 // Convenience function: call an external reference. 682 void CallExternalReference(ExternalReference ref, int num_arguments); 683 684 // Convenience function: tail call a runtime routine (jump). 685 void TailCallRuntime(Runtime::FunctionId fid); 686 687 // Before calling a C-function from generated code, align arguments on stack. 688 // After aligning the frame, arguments must be stored in esp[0], esp[4], 689 // etc., not pushed. The argument count assumes all arguments are word sized. 690 // Some compilers/platforms require the stack to be aligned when calling 691 // C++ code. 692 // Needs a scratch register to do some arithmetic. This register will be 693 // trashed. 694 void PrepareCallCFunction(int num_arguments, Register scratch); 695 696 // Calls a C function and cleans up the space for arguments allocated 697 // by PrepareCallCFunction. The called function is not allowed to trigger a 698 // garbage collection, since that might move the code and invalidate the 699 // return address (unless this is somehow accounted for by the called 700 // function). 701 void CallCFunction(ExternalReference function, int num_arguments); 702 void CallCFunction(Register function, int num_arguments); 703 704 // Jump to a runtime routine. 705 void JumpToExternalReference(const ExternalReference& ext, 706 bool builtin_exit_frame = false); 707 708 // --------------------------------------------------------------------------- 709 // Utilities 710 711 void Ret(); 712 713 // Return and drop arguments from stack, where the number of arguments 714 // may be bigger than 2^16 - 1. Requires a scratch register. 715 void Ret(int bytes_dropped, Register scratch); 716 717 // Emit code that loads |parameter_index|'th parameter from the stack to 718 // the register according to the CallInterfaceDescriptor definition. 719 // |sp_to_caller_sp_offset_in_words| specifies the number of words pushed 720 // below the caller's sp (on ia32 it's at least return address). 721 template <class Descriptor> 722 void LoadParameterFromStack( 723 Register reg, typename Descriptor::ParameterIndices parameter_index, 724 int sp_to_ra_offset_in_words = 1) { 725 DCHECK(Descriptor::kPassLastArgsOnStack); 726 DCHECK_LT(parameter_index, Descriptor::kParameterCount); 727 DCHECK_LE(Descriptor::kParameterCount - Descriptor::kStackArgumentsCount, 728 parameter_index); 729 int offset = (Descriptor::kParameterCount - parameter_index - 1 + 730 sp_to_ra_offset_in_words) * 731 kPointerSize; 732 mov(reg, Operand(esp, offset)); 733 } 734 735 // Emit code to discard a non-negative number of pointer-sized elements 736 // from the stack, clobbering only the esp register. 737 void Drop(int element_count); 738 739 void Call(Label* target) { call(target); } 740 void Call(Handle<Code> target, RelocInfo::Mode rmode, 741 TypeFeedbackId id = TypeFeedbackId::None()) { 742 call(target, rmode, id); 743 } 744 void Jump(Handle<Code> target, RelocInfo::Mode rmode) { jmp(target, rmode); } 745 void Push(Register src) { push(src); } 746 void Push(const Operand& src) { push(src); } 747 void Push(Immediate value) { push(value); } 748 void Pop(Register dst) { pop(dst); } 749 void Pop(const Operand& dst) { pop(dst); } 750 void PushReturnAddressFrom(Register src) { push(src); } 751 void PopReturnAddressTo(Register dst) { pop(dst); } 752 753 // Non-SSE2 instructions. 754 void Pextrd(Register dst, XMMRegister src, int8_t imm8); 755 void Pinsrd(XMMRegister dst, Register src, int8_t imm8) { 756 Pinsrd(dst, Operand(src), imm8); 757 } 758 void Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8); 759 760 void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); } 761 void Lzcnt(Register dst, const Operand& src); 762 763 void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); } 764 void Tzcnt(Register dst, const Operand& src); 765 766 void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); } 767 void Popcnt(Register dst, const Operand& src); 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, float src) { Move(dst, bit_cast<uint32_t>(src)); } 780 void Move(XMMRegister dst, double src) { Move(dst, bit_cast<uint64_t>(src)); } 781 782 void Move(Register dst, Handle<Object> handle) { LoadObject(dst, handle); } 783 void Move(Register dst, Smi* source) { Move(dst, Immediate(source)); } 784 785 // Push a handle value. 786 void Push(Handle<Object> handle) { push(Immediate(handle)); } 787 void Push(Smi* smi) { Push(Immediate(smi)); } 788 789 Handle<Object> CodeObject() { 790 DCHECK(!code_object_.is_null()); 791 return code_object_; 792 } 793 794 // Emit code for a truncating division by a constant. The dividend register is 795 // unchanged, the result is in edx, and eax gets clobbered. 796 void TruncatingDiv(Register dividend, int32_t divisor); 797 798 // --------------------------------------------------------------------------- 799 // StatsCounter support 800 801 void SetCounter(StatsCounter* counter, int value); 802 void IncrementCounter(StatsCounter* counter, int value); 803 void DecrementCounter(StatsCounter* counter, int value); 804 void IncrementCounter(Condition cc, StatsCounter* counter, int value); 805 void DecrementCounter(Condition cc, StatsCounter* counter, int value); 806 807 // --------------------------------------------------------------------------- 808 // Debugging 809 810 // Calls Abort(msg) if the condition cc is not satisfied. 811 // Use --debug_code to enable. 812 void Assert(Condition cc, BailoutReason reason); 813 814 void AssertFastElements(Register elements); 815 816 // Like Assert(), but always enabled. 817 void Check(Condition cc, BailoutReason reason); 818 819 // Print a message to stdout and abort execution. 820 void Abort(BailoutReason reason); 821 822 // Check that the stack is aligned. 823 void CheckStackAlignment(); 824 825 // Verify restrictions about code generated in stubs. 826 void set_generating_stub(bool value) { generating_stub_ = value; } 827 bool generating_stub() { return generating_stub_; } 828 void set_has_frame(bool value) { has_frame_ = value; } 829 bool has_frame() { return has_frame_; } 830 inline bool AllowThisStubCall(CodeStub* stub); 831 832 // --------------------------------------------------------------------------- 833 // String utilities. 834 835 // Checks if both objects are sequential one-byte strings, and jumps to label 836 // if either is not. 837 void JumpIfNotBothSequentialOneByteStrings( 838 Register object1, Register object2, Register scratch1, Register scratch2, 839 Label* on_not_flat_one_byte_strings); 840 841 // Checks if the given register or operand is a unique name 842 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name, 843 Label::Distance distance = Label::kFar) { 844 JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance); 845 } 846 847 void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name, 848 Label::Distance distance = Label::kFar); 849 850 void EmitSeqStringSetCharCheck(Register string, Register index, 851 Register value, uint32_t encoding_mask); 852 853 static int SafepointRegisterStackIndex(Register reg) { 854 return SafepointRegisterStackIndex(reg.code()); 855 } 856 857 // Load the type feedback vector from a JavaScript frame. 858 void EmitLoadFeedbackVector(Register vector); 859 860 // Activation support. 861 void EnterFrame(StackFrame::Type type); 862 void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg); 863 void LeaveFrame(StackFrame::Type type); 864 865 void EnterBuiltinFrame(Register context, Register target, Register argc); 866 void LeaveBuiltinFrame(Register context, Register target, Register argc); 867 868 // Expects object in eax and returns map with validated enum cache 869 // in eax. Assumes that any other register can be used as a scratch. 870 void CheckEnumCache(Label* call_runtime); 871 872 // AllocationMemento support. Arrays may have an associated 873 // AllocationMemento object that can be checked for in order to pretransition 874 // to another type. 875 // On entry, receiver_reg should point to the array object. 876 // scratch_reg gets clobbered. 877 // If allocation info is present, conditional code is set to equal. 878 void TestJSArrayForAllocationMemento(Register receiver_reg, 879 Register scratch_reg, 880 Label* no_memento_found); 881 882 private: 883 bool generating_stub_; 884 bool has_frame_; 885 // This handle will be patched with the code object on installation. 886 Handle<Object> code_object_; 887 888 // Helper functions for generating invokes. 889 void InvokePrologue(const ParameterCount& expected, 890 const ParameterCount& actual, Label* done, 891 bool* definitely_mismatches, InvokeFlag flag, 892 Label::Distance done_distance, 893 const CallWrapper& call_wrapper); 894 895 void EnterExitFramePrologue(StackFrame::Type frame_type); 896 void EnterExitFrameEpilogue(int argc, bool save_doubles); 897 898 void LeaveExitFrameEpilogue(bool restore_context); 899 900 // Allocation support helpers. 901 void LoadAllocationTopHelper(Register result, Register scratch, 902 AllocationFlags flags); 903 904 void UpdateAllocationTopHelper(Register result_end, Register scratch, 905 AllocationFlags flags); 906 907 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace. 908 void InNewSpace(Register object, Register scratch, Condition cc, 909 Label* condition_met, 910 Label::Distance condition_met_distance = Label::kFar); 911 912 // Helper for finding the mark bits for an address. Afterwards, the 913 // bitmap register points at the word with the mark bits and the mask 914 // the position of the first bit. Uses ecx as scratch and leaves addr_reg 915 // unchanged. 916 inline void GetMarkBits(Register addr_reg, Register bitmap_reg, 917 Register mask_reg); 918 919 // Compute memory operands for safepoint stack slots. 920 Operand SafepointRegisterSlot(Register reg); 921 static int SafepointRegisterStackIndex(int reg_code); 922 923 // Needs access to SafepointRegisterStackIndex for compiled frame 924 // traversal. 925 friend class StandardFrame; 926}; 927 928// The code patcher is used to patch (typically) small parts of code e.g. for 929// debugging and other types of instrumentation. When using the code patcher 930// the exact number of bytes specified must be emitted. Is not legal to emit 931// relocation information. If any of these constraints are violated it causes 932// an assertion. 933class CodePatcher { 934 public: 935 CodePatcher(Isolate* isolate, byte* address, int size); 936 ~CodePatcher(); 937 938 // Macro assembler to emit code. 939 MacroAssembler* masm() { return &masm_; } 940 941 private: 942 byte* address_; // The address of the code being patched. 943 int size_; // Number of bytes of the expected patch size. 944 MacroAssembler masm_; // Macro assembler used to generate the code. 945}; 946 947// ----------------------------------------------------------------------------- 948// Static helper functions. 949 950// Generate an Operand for loading a field from an object. 951inline Operand FieldOperand(Register object, int offset) { 952 return Operand(object, offset - kHeapObjectTag); 953} 954 955// Generate an Operand for loading an indexed field from an object. 956inline Operand FieldOperand(Register object, Register index, ScaleFactor scale, 957 int offset) { 958 return Operand(object, index, scale, offset - kHeapObjectTag); 959} 960 961inline Operand FixedArrayElementOperand(Register array, Register index_as_smi, 962 int additional_offset = 0) { 963 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize; 964 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset); 965} 966 967inline Operand ContextOperand(Register context, int index) { 968 return Operand(context, Context::SlotOffset(index)); 969} 970 971inline Operand ContextOperand(Register context, Register index) { 972 return Operand(context, index, times_pointer_size, Context::SlotOffset(0)); 973} 974 975inline Operand NativeContextOperand() { 976 return ContextOperand(esi, Context::NATIVE_CONTEXT_INDEX); 977} 978 979#define ACCESS_MASM(masm) masm-> 980 981} // namespace internal 982} // namespace v8 983 984#endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_ 985