1 //===-- Function.cpp - Implement the Global object classes ----------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Function class for the IR library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/IR/Function.h" 15 #include "LLVMContextImpl.h" 16 #include "SymbolTableListTraitsImpl.h" 17 #include "llvm/ADT/STLExtras.h" 18 #include "llvm/ADT/StringExtras.h" 19 #include "llvm/CodeGen/ValueTypes.h" 20 #include "llvm/IR/CallSite.h" 21 #include "llvm/IR/Constants.h" 22 #include "llvm/IR/DerivedTypes.h" 23 #include "llvm/IR/InstIterator.h" 24 #include "llvm/IR/IntrinsicInst.h" 25 #include "llvm/IR/LLVMContext.h" 26 #include "llvm/IR/MDBuilder.h" 27 #include "llvm/IR/Metadata.h" 28 #include "llvm/IR/Module.h" 29 #include "llvm/Support/ManagedStatic.h" 30 #include "llvm/Support/RWMutex.h" 31 #include "llvm/Support/StringPool.h" 32 #include "llvm/Support/Threading.h" 33 using namespace llvm; 34 35 // Explicit instantiations of SymbolTableListTraits since some of the methods 36 // are not in the public header file... 37 template class llvm::SymbolTableListTraits<Argument>; 38 template class llvm::SymbolTableListTraits<BasicBlock>; 39 40 //===----------------------------------------------------------------------===// 41 // Argument Implementation 42 //===----------------------------------------------------------------------===// 43 44 void Argument::anchor() { } 45 46 Argument::Argument(Type *Ty, const Twine &Name, Function *Par) 47 : Value(Ty, Value::ArgumentVal) { 48 Parent = nullptr; 49 50 if (Par) 51 Par->getArgumentList().push_back(this); 52 setName(Name); 53 } 54 55 void Argument::setParent(Function *parent) { 56 Parent = parent; 57 } 58 59 /// getArgNo - Return the index of this formal argument in its containing 60 /// function. For example in "void foo(int a, float b)" a is 0 and b is 1. 61 unsigned Argument::getArgNo() const { 62 const Function *F = getParent(); 63 assert(F && "Argument is not in a function"); 64 65 Function::const_arg_iterator AI = F->arg_begin(); 66 unsigned ArgIdx = 0; 67 for (; &*AI != this; ++AI) 68 ++ArgIdx; 69 70 return ArgIdx; 71 } 72 73 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on 74 /// it in its containing function. Also returns true if at least one byte is 75 /// known to be dereferenceable and the pointer is in addrspace(0). 76 bool Argument::hasNonNullAttr() const { 77 if (!getType()->isPointerTy()) return false; 78 if (getParent()->getAttributes(). 79 hasAttribute(getArgNo()+1, Attribute::NonNull)) 80 return true; 81 else if (getDereferenceableBytes() > 0 && 82 getType()->getPointerAddressSpace() == 0) 83 return true; 84 return false; 85 } 86 87 /// hasByValAttr - Return true if this argument has the byval attribute on it 88 /// in its containing function. 89 bool Argument::hasByValAttr() const { 90 if (!getType()->isPointerTy()) return false; 91 return hasAttribute(Attribute::ByVal); 92 } 93 94 bool Argument::hasSwiftSelfAttr() const { 95 return getParent()->getAttributes(). 96 hasAttribute(getArgNo()+1, Attribute::SwiftSelf); 97 } 98 99 bool Argument::hasSwiftErrorAttr() const { 100 return getParent()->getAttributes(). 101 hasAttribute(getArgNo()+1, Attribute::SwiftError); 102 } 103 104 /// \brief Return true if this argument has the inalloca attribute on it in 105 /// its containing function. 106 bool Argument::hasInAllocaAttr() const { 107 if (!getType()->isPointerTy()) return false; 108 return hasAttribute(Attribute::InAlloca); 109 } 110 111 bool Argument::hasByValOrInAllocaAttr() const { 112 if (!getType()->isPointerTy()) return false; 113 AttributeSet Attrs = getParent()->getAttributes(); 114 return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) || 115 Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca); 116 } 117 118 unsigned Argument::getParamAlignment() const { 119 assert(getType()->isPointerTy() && "Only pointers have alignments"); 120 return getParent()->getParamAlignment(getArgNo()+1); 121 122 } 123 124 uint64_t Argument::getDereferenceableBytes() const { 125 assert(getType()->isPointerTy() && 126 "Only pointers have dereferenceable bytes"); 127 return getParent()->getDereferenceableBytes(getArgNo()+1); 128 } 129 130 uint64_t Argument::getDereferenceableOrNullBytes() const { 131 assert(getType()->isPointerTy() && 132 "Only pointers have dereferenceable bytes"); 133 return getParent()->getDereferenceableOrNullBytes(getArgNo()+1); 134 } 135 136 /// hasNestAttr - Return true if this argument has the nest attribute on 137 /// it in its containing function. 138 bool Argument::hasNestAttr() const { 139 if (!getType()->isPointerTy()) return false; 140 return hasAttribute(Attribute::Nest); 141 } 142 143 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on 144 /// it in its containing function. 145 bool Argument::hasNoAliasAttr() const { 146 if (!getType()->isPointerTy()) return false; 147 return hasAttribute(Attribute::NoAlias); 148 } 149 150 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute 151 /// on it in its containing function. 152 bool Argument::hasNoCaptureAttr() const { 153 if (!getType()->isPointerTy()) return false; 154 return hasAttribute(Attribute::NoCapture); 155 } 156 157 /// hasSRetAttr - Return true if this argument has the sret attribute on 158 /// it in its containing function. 159 bool Argument::hasStructRetAttr() const { 160 if (!getType()->isPointerTy()) return false; 161 return hasAttribute(Attribute::StructRet); 162 } 163 164 /// hasReturnedAttr - Return true if this argument has the returned attribute on 165 /// it in its containing function. 166 bool Argument::hasReturnedAttr() const { 167 return hasAttribute(Attribute::Returned); 168 } 169 170 /// hasZExtAttr - Return true if this argument has the zext attribute on it in 171 /// its containing function. 172 bool Argument::hasZExtAttr() const { 173 return hasAttribute(Attribute::ZExt); 174 } 175 176 /// hasSExtAttr Return true if this argument has the sext attribute on it in its 177 /// containing function. 178 bool Argument::hasSExtAttr() const { 179 return hasAttribute(Attribute::SExt); 180 } 181 182 /// Return true if this argument has the readonly or readnone attribute on it 183 /// in its containing function. 184 bool Argument::onlyReadsMemory() const { 185 return getParent()->getAttributes(). 186 hasAttribute(getArgNo()+1, Attribute::ReadOnly) || 187 getParent()->getAttributes(). 188 hasAttribute(getArgNo()+1, Attribute::ReadNone); 189 } 190 191 /// addAttr - Add attributes to an argument. 192 void Argument::addAttr(AttributeSet AS) { 193 assert(AS.getNumSlots() <= 1 && 194 "Trying to add more than one attribute set to an argument!"); 195 AttrBuilder B(AS, AS.getSlotIndex(0)); 196 getParent()->addAttributes(getArgNo() + 1, 197 AttributeSet::get(Parent->getContext(), 198 getArgNo() + 1, B)); 199 } 200 201 /// removeAttr - Remove attributes from an argument. 202 void Argument::removeAttr(AttributeSet AS) { 203 assert(AS.getNumSlots() <= 1 && 204 "Trying to remove more than one attribute set from an argument!"); 205 AttrBuilder B(AS, AS.getSlotIndex(0)); 206 getParent()->removeAttributes(getArgNo() + 1, 207 AttributeSet::get(Parent->getContext(), 208 getArgNo() + 1, B)); 209 } 210 211 /// hasAttribute - Checks if an argument has a given attribute. 212 bool Argument::hasAttribute(Attribute::AttrKind Kind) const { 213 return getParent()->hasAttribute(getArgNo() + 1, Kind); 214 } 215 216 //===----------------------------------------------------------------------===// 217 // Helper Methods in Function 218 //===----------------------------------------------------------------------===// 219 220 bool Function::isMaterializable() const { 221 return getGlobalObjectSubClassData() & (1 << IsMaterializableBit); 222 } 223 224 void Function::setIsMaterializable(bool V) { 225 unsigned Mask = 1 << IsMaterializableBit; 226 setGlobalObjectSubClassData((~Mask & getGlobalObjectSubClassData()) | 227 (V ? Mask : 0u)); 228 } 229 230 LLVMContext &Function::getContext() const { 231 return getType()->getContext(); 232 } 233 234 FunctionType *Function::getFunctionType() const { 235 return cast<FunctionType>(getValueType()); 236 } 237 238 bool Function::isVarArg() const { 239 return getFunctionType()->isVarArg(); 240 } 241 242 Type *Function::getReturnType() const { 243 return getFunctionType()->getReturnType(); 244 } 245 246 void Function::removeFromParent() { 247 getParent()->getFunctionList().remove(getIterator()); 248 } 249 250 void Function::eraseFromParent() { 251 getParent()->getFunctionList().erase(getIterator()); 252 } 253 254 //===----------------------------------------------------------------------===// 255 // Function Implementation 256 //===----------------------------------------------------------------------===// 257 258 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name, 259 Module *ParentModule) 260 : GlobalObject(Ty, Value::FunctionVal, 261 OperandTraits<Function>::op_begin(this), 0, Linkage, name) { 262 assert(FunctionType::isValidReturnType(getReturnType()) && 263 "invalid return type"); 264 setGlobalObjectSubClassData(0); 265 SymTab = new ValueSymbolTable(); 266 267 // If the function has arguments, mark them as lazily built. 268 if (Ty->getNumParams()) 269 setValueSubclassData(1); // Set the "has lazy arguments" bit. 270 271 if (ParentModule) 272 ParentModule->getFunctionList().push_back(this); 273 274 // Ensure intrinsics have the right parameter attributes. 275 // Note, the IntID field will have been set in Value::setName if this function 276 // name is a valid intrinsic ID. 277 if (IntID) 278 setAttributes(Intrinsic::getAttributes(getContext(), IntID)); 279 } 280 281 Function::~Function() { 282 dropAllReferences(); // After this it is safe to delete instructions. 283 284 // Delete all of the method arguments and unlink from symbol table... 285 ArgumentList.clear(); 286 delete SymTab; 287 288 // Remove the function from the on-the-side GC table. 289 clearGC(); 290 } 291 292 void Function::BuildLazyArguments() const { 293 // Create the arguments vector, all arguments start out unnamed. 294 FunctionType *FT = getFunctionType(); 295 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) { 296 assert(!FT->getParamType(i)->isVoidTy() && 297 "Cannot have void typed arguments!"); 298 ArgumentList.push_back(new Argument(FT->getParamType(i))); 299 } 300 301 // Clear the lazy arguments bit. 302 unsigned SDC = getSubclassDataFromValue(); 303 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0)); 304 } 305 306 void Function::stealArgumentListFrom(Function &Src) { 307 assert(isDeclaration() && "Expected no references to current arguments"); 308 309 // Drop the current arguments, if any, and set the lazy argument bit. 310 if (!hasLazyArguments()) { 311 assert(llvm::all_of(ArgumentList, 312 [](const Argument &A) { return A.use_empty(); }) && 313 "Expected arguments to be unused in declaration"); 314 ArgumentList.clear(); 315 setValueSubclassData(getSubclassDataFromValue() | (1 << 0)); 316 } 317 318 // Nothing to steal if Src has lazy arguments. 319 if (Src.hasLazyArguments()) 320 return; 321 322 // Steal arguments from Src, and fix the lazy argument bits. 323 ArgumentList.splice(ArgumentList.end(), Src.ArgumentList); 324 setValueSubclassData(getSubclassDataFromValue() & ~(1 << 0)); 325 Src.setValueSubclassData(Src.getSubclassDataFromValue() | (1 << 0)); 326 } 327 328 size_t Function::arg_size() const { 329 return getFunctionType()->getNumParams(); 330 } 331 bool Function::arg_empty() const { 332 return getFunctionType()->getNumParams() == 0; 333 } 334 335 void Function::setParent(Module *parent) { 336 Parent = parent; 337 } 338 339 // dropAllReferences() - This function causes all the subinstructions to "let 340 // go" of all references that they are maintaining. This allows one to 341 // 'delete' a whole class at a time, even though there may be circular 342 // references... first all references are dropped, and all use counts go to 343 // zero. Then everything is deleted for real. Note that no operations are 344 // valid on an object that has "dropped all references", except operator 345 // delete. 346 // 347 void Function::dropAllReferences() { 348 setIsMaterializable(false); 349 350 for (BasicBlock &BB : *this) 351 BB.dropAllReferences(); 352 353 // Delete all basic blocks. They are now unused, except possibly by 354 // blockaddresses, but BasicBlock's destructor takes care of those. 355 while (!BasicBlocks.empty()) 356 BasicBlocks.begin()->eraseFromParent(); 357 358 // Drop uses of any optional data (real or placeholder). 359 if (getNumOperands()) { 360 User::dropAllReferences(); 361 setNumHungOffUseOperands(0); 362 setValueSubclassData(getSubclassDataFromValue() & ~0xe); 363 } 364 365 // Metadata is stored in a side-table. 366 clearMetadata(); 367 } 368 369 void Function::addAttribute(unsigned i, Attribute::AttrKind Kind) { 370 AttributeSet PAL = getAttributes(); 371 PAL = PAL.addAttribute(getContext(), i, Kind); 372 setAttributes(PAL); 373 } 374 375 void Function::addAttribute(unsigned i, Attribute Attr) { 376 AttributeSet PAL = getAttributes(); 377 PAL = PAL.addAttribute(getContext(), i, Attr); 378 setAttributes(PAL); 379 } 380 381 void Function::addAttributes(unsigned i, AttributeSet Attrs) { 382 AttributeSet PAL = getAttributes(); 383 PAL = PAL.addAttributes(getContext(), i, Attrs); 384 setAttributes(PAL); 385 } 386 387 void Function::removeAttribute(unsigned i, Attribute::AttrKind Kind) { 388 AttributeSet PAL = getAttributes(); 389 PAL = PAL.removeAttribute(getContext(), i, Kind); 390 setAttributes(PAL); 391 } 392 393 void Function::removeAttribute(unsigned i, StringRef Kind) { 394 AttributeSet PAL = getAttributes(); 395 PAL = PAL.removeAttribute(getContext(), i, Kind); 396 setAttributes(PAL); 397 } 398 399 void Function::removeAttributes(unsigned i, AttributeSet Attrs) { 400 AttributeSet PAL = getAttributes(); 401 PAL = PAL.removeAttributes(getContext(), i, Attrs); 402 setAttributes(PAL); 403 } 404 405 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) { 406 AttributeSet PAL = getAttributes(); 407 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes); 408 setAttributes(PAL); 409 } 410 411 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) { 412 AttributeSet PAL = getAttributes(); 413 PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes); 414 setAttributes(PAL); 415 } 416 417 const std::string &Function::getGC() const { 418 assert(hasGC() && "Function has no collector"); 419 return getContext().getGC(*this); 420 } 421 422 void Function::setGC(std::string Str) { 423 setValueSubclassDataBit(14, !Str.empty()); 424 getContext().setGC(*this, std::move(Str)); 425 } 426 427 void Function::clearGC() { 428 if (!hasGC()) 429 return; 430 getContext().deleteGC(*this); 431 setValueSubclassDataBit(14, false); 432 } 433 434 /// Copy all additional attributes (those not needed to create a Function) from 435 /// the Function Src to this one. 436 void Function::copyAttributesFrom(const GlobalValue *Src) { 437 GlobalObject::copyAttributesFrom(Src); 438 const Function *SrcF = dyn_cast<Function>(Src); 439 if (!SrcF) 440 return; 441 442 setCallingConv(SrcF->getCallingConv()); 443 setAttributes(SrcF->getAttributes()); 444 if (SrcF->hasGC()) 445 setGC(SrcF->getGC()); 446 else 447 clearGC(); 448 if (SrcF->hasPersonalityFn()) 449 setPersonalityFn(SrcF->getPersonalityFn()); 450 if (SrcF->hasPrefixData()) 451 setPrefixData(SrcF->getPrefixData()); 452 if (SrcF->hasPrologueData()) 453 setPrologueData(SrcF->getPrologueData()); 454 } 455 456 /// Table of string intrinsic names indexed by enum value. 457 static const char * const IntrinsicNameTable[] = { 458 "not_intrinsic", 459 #define GET_INTRINSIC_NAME_TABLE 460 #include "llvm/IR/Intrinsics.gen" 461 #undef GET_INTRINSIC_NAME_TABLE 462 }; 463 464 /// \brief This does the actual lookup of an intrinsic ID which 465 /// matches the given function name. 466 static Intrinsic::ID lookupIntrinsicID(const ValueName *ValName) { 467 StringRef Name = ValName->getKey(); 468 469 ArrayRef<const char *> NameTable(&IntrinsicNameTable[1], 470 std::end(IntrinsicNameTable)); 471 int Idx = Intrinsic::lookupLLVMIntrinsicByName(NameTable, Name); 472 Intrinsic::ID ID = static_cast<Intrinsic::ID>(Idx + 1); 473 if (ID == Intrinsic::not_intrinsic) 474 return ID; 475 476 // If the intrinsic is not overloaded, require an exact match. If it is 477 // overloaded, require a prefix match. 478 bool IsPrefixMatch = Name.size() > strlen(NameTable[Idx]); 479 return IsPrefixMatch == isOverloaded(ID) ? ID : Intrinsic::not_intrinsic; 480 } 481 482 void Function::recalculateIntrinsicID() { 483 const ValueName *ValName = this->getValueName(); 484 if (!ValName || !isIntrinsic()) { 485 IntID = Intrinsic::not_intrinsic; 486 return; 487 } 488 IntID = lookupIntrinsicID(ValName); 489 } 490 491 /// Returns a stable mangling for the type specified for use in the name 492 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling 493 /// of named types is simply their name. Manglings for unnamed types consist 494 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions) 495 /// combined with the mangling of their component types. A vararg function 496 /// type will have a suffix of 'vararg'. Since function types can contain 497 /// other function types, we close a function type mangling with suffix 'f' 498 /// which can't be confused with it's prefix. This ensures we don't have 499 /// collisions between two unrelated function types. Otherwise, you might 500 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.) 501 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most 502 /// cases) fall back to the MVT codepath, where they could be mangled to 503 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle 504 /// everything. 505 static std::string getMangledTypeStr(Type* Ty) { 506 std::string Result; 507 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) { 508 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) + 509 getMangledTypeStr(PTyp->getElementType()); 510 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) { 511 Result += "a" + llvm::utostr(ATyp->getNumElements()) + 512 getMangledTypeStr(ATyp->getElementType()); 513 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) { 514 assert(!STyp->isLiteral() && "TODO: implement literal types"); 515 Result += STyp->getName(); 516 } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) { 517 Result += "f_" + getMangledTypeStr(FT->getReturnType()); 518 for (size_t i = 0; i < FT->getNumParams(); i++) 519 Result += getMangledTypeStr(FT->getParamType(i)); 520 if (FT->isVarArg()) 521 Result += "vararg"; 522 // Ensure nested function types are distinguishable. 523 Result += "f"; 524 } else if (isa<VectorType>(Ty)) 525 Result += "v" + utostr(Ty->getVectorNumElements()) + 526 getMangledTypeStr(Ty->getVectorElementType()); 527 else if (Ty) 528 Result += EVT::getEVT(Ty).getEVTString(); 529 return Result; 530 } 531 532 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) { 533 assert(id < num_intrinsics && "Invalid intrinsic ID!"); 534 std::string Result(IntrinsicNameTable[id]); 535 for (Type *Ty : Tys) { 536 Result += "." + getMangledTypeStr(Ty); 537 } 538 return Result; 539 } 540 541 542 /// IIT_Info - These are enumerators that describe the entries returned by the 543 /// getIntrinsicInfoTableEntries function. 544 /// 545 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter! 546 enum IIT_Info { 547 // Common values should be encoded with 0-15. 548 IIT_Done = 0, 549 IIT_I1 = 1, 550 IIT_I8 = 2, 551 IIT_I16 = 3, 552 IIT_I32 = 4, 553 IIT_I64 = 5, 554 IIT_F16 = 6, 555 IIT_F32 = 7, 556 IIT_F64 = 8, 557 IIT_V2 = 9, 558 IIT_V4 = 10, 559 IIT_V8 = 11, 560 IIT_V16 = 12, 561 IIT_V32 = 13, 562 IIT_PTR = 14, 563 IIT_ARG = 15, 564 565 // Values from 16+ are only encodable with the inefficient encoding. 566 IIT_V64 = 16, 567 IIT_MMX = 17, 568 IIT_TOKEN = 18, 569 IIT_METADATA = 19, 570 IIT_EMPTYSTRUCT = 20, 571 IIT_STRUCT2 = 21, 572 IIT_STRUCT3 = 22, 573 IIT_STRUCT4 = 23, 574 IIT_STRUCT5 = 24, 575 IIT_EXTEND_ARG = 25, 576 IIT_TRUNC_ARG = 26, 577 IIT_ANYPTR = 27, 578 IIT_V1 = 28, 579 IIT_VARARG = 29, 580 IIT_HALF_VEC_ARG = 30, 581 IIT_SAME_VEC_WIDTH_ARG = 31, 582 IIT_PTR_TO_ARG = 32, 583 IIT_VEC_OF_PTRS_TO_ELT = 33, 584 IIT_I128 = 34, 585 IIT_V512 = 35, 586 IIT_V1024 = 36 587 }; 588 589 590 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos, 591 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) { 592 IIT_Info Info = IIT_Info(Infos[NextElt++]); 593 unsigned StructElts = 2; 594 using namespace Intrinsic; 595 596 switch (Info) { 597 case IIT_Done: 598 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0)); 599 return; 600 case IIT_VARARG: 601 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0)); 602 return; 603 case IIT_MMX: 604 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0)); 605 return; 606 case IIT_TOKEN: 607 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0)); 608 return; 609 case IIT_METADATA: 610 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0)); 611 return; 612 case IIT_F16: 613 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0)); 614 return; 615 case IIT_F32: 616 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0)); 617 return; 618 case IIT_F64: 619 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0)); 620 return; 621 case IIT_I1: 622 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1)); 623 return; 624 case IIT_I8: 625 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8)); 626 return; 627 case IIT_I16: 628 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16)); 629 return; 630 case IIT_I32: 631 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32)); 632 return; 633 case IIT_I64: 634 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64)); 635 return; 636 case IIT_I128: 637 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128)); 638 return; 639 case IIT_V1: 640 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1)); 641 DecodeIITType(NextElt, Infos, OutputTable); 642 return; 643 case IIT_V2: 644 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2)); 645 DecodeIITType(NextElt, Infos, OutputTable); 646 return; 647 case IIT_V4: 648 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4)); 649 DecodeIITType(NextElt, Infos, OutputTable); 650 return; 651 case IIT_V8: 652 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8)); 653 DecodeIITType(NextElt, Infos, OutputTable); 654 return; 655 case IIT_V16: 656 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16)); 657 DecodeIITType(NextElt, Infos, OutputTable); 658 return; 659 case IIT_V32: 660 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32)); 661 DecodeIITType(NextElt, Infos, OutputTable); 662 return; 663 case IIT_V64: 664 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64)); 665 DecodeIITType(NextElt, Infos, OutputTable); 666 return; 667 case IIT_V512: 668 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 512)); 669 DecodeIITType(NextElt, Infos, OutputTable); 670 return; 671 case IIT_V1024: 672 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1024)); 673 DecodeIITType(NextElt, Infos, OutputTable); 674 return; 675 case IIT_PTR: 676 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0)); 677 DecodeIITType(NextElt, Infos, OutputTable); 678 return; 679 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype] 680 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 681 Infos[NextElt++])); 682 DecodeIITType(NextElt, Infos, OutputTable); 683 return; 684 } 685 case IIT_ARG: { 686 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 687 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo)); 688 return; 689 } 690 case IIT_EXTEND_ARG: { 691 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 692 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument, 693 ArgInfo)); 694 return; 695 } 696 case IIT_TRUNC_ARG: { 697 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 698 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument, 699 ArgInfo)); 700 return; 701 } 702 case IIT_HALF_VEC_ARG: { 703 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 704 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument, 705 ArgInfo)); 706 return; 707 } 708 case IIT_SAME_VEC_WIDTH_ARG: { 709 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 710 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument, 711 ArgInfo)); 712 return; 713 } 714 case IIT_PTR_TO_ARG: { 715 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 716 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument, 717 ArgInfo)); 718 return; 719 } 720 case IIT_VEC_OF_PTRS_TO_ELT: { 721 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); 722 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt, 723 ArgInfo)); 724 return; 725 } 726 case IIT_EMPTYSTRUCT: 727 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0)); 728 return; 729 case IIT_STRUCT5: ++StructElts; // FALL THROUGH. 730 case IIT_STRUCT4: ++StructElts; // FALL THROUGH. 731 case IIT_STRUCT3: ++StructElts; // FALL THROUGH. 732 case IIT_STRUCT2: { 733 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts)); 734 735 for (unsigned i = 0; i != StructElts; ++i) 736 DecodeIITType(NextElt, Infos, OutputTable); 737 return; 738 } 739 } 740 llvm_unreachable("unhandled"); 741 } 742 743 744 #define GET_INTRINSIC_GENERATOR_GLOBAL 745 #include "llvm/IR/Intrinsics.gen" 746 #undef GET_INTRINSIC_GENERATOR_GLOBAL 747 748 void Intrinsic::getIntrinsicInfoTableEntries(ID id, 749 SmallVectorImpl<IITDescriptor> &T){ 750 // Check to see if the intrinsic's type was expressible by the table. 751 unsigned TableVal = IIT_Table[id-1]; 752 753 // Decode the TableVal into an array of IITValues. 754 SmallVector<unsigned char, 8> IITValues; 755 ArrayRef<unsigned char> IITEntries; 756 unsigned NextElt = 0; 757 if ((TableVal >> 31) != 0) { 758 // This is an offset into the IIT_LongEncodingTable. 759 IITEntries = IIT_LongEncodingTable; 760 761 // Strip sentinel bit. 762 NextElt = (TableVal << 1) >> 1; 763 } else { 764 // Decode the TableVal into an array of IITValues. If the entry was encoded 765 // into a single word in the table itself, decode it now. 766 do { 767 IITValues.push_back(TableVal & 0xF); 768 TableVal >>= 4; 769 } while (TableVal); 770 771 IITEntries = IITValues; 772 NextElt = 0; 773 } 774 775 // Okay, decode the table into the output vector of IITDescriptors. 776 DecodeIITType(NextElt, IITEntries, T); 777 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0) 778 DecodeIITType(NextElt, IITEntries, T); 779 } 780 781 782 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos, 783 ArrayRef<Type*> Tys, LLVMContext &Context) { 784 using namespace Intrinsic; 785 IITDescriptor D = Infos.front(); 786 Infos = Infos.slice(1); 787 788 switch (D.Kind) { 789 case IITDescriptor::Void: return Type::getVoidTy(Context); 790 case IITDescriptor::VarArg: return Type::getVoidTy(Context); 791 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context); 792 case IITDescriptor::Token: return Type::getTokenTy(Context); 793 case IITDescriptor::Metadata: return Type::getMetadataTy(Context); 794 case IITDescriptor::Half: return Type::getHalfTy(Context); 795 case IITDescriptor::Float: return Type::getFloatTy(Context); 796 case IITDescriptor::Double: return Type::getDoubleTy(Context); 797 798 case IITDescriptor::Integer: 799 return IntegerType::get(Context, D.Integer_Width); 800 case IITDescriptor::Vector: 801 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width); 802 case IITDescriptor::Pointer: 803 return PointerType::get(DecodeFixedType(Infos, Tys, Context), 804 D.Pointer_AddressSpace); 805 case IITDescriptor::Struct: { 806 Type *Elts[5]; 807 assert(D.Struct_NumElements <= 5 && "Can't handle this yet"); 808 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i) 809 Elts[i] = DecodeFixedType(Infos, Tys, Context); 810 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements)); 811 } 812 813 case IITDescriptor::Argument: 814 return Tys[D.getArgumentNumber()]; 815 case IITDescriptor::ExtendArgument: { 816 Type *Ty = Tys[D.getArgumentNumber()]; 817 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) 818 return VectorType::getExtendedElementVectorType(VTy); 819 820 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth()); 821 } 822 case IITDescriptor::TruncArgument: { 823 Type *Ty = Tys[D.getArgumentNumber()]; 824 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) 825 return VectorType::getTruncatedElementVectorType(VTy); 826 827 IntegerType *ITy = cast<IntegerType>(Ty); 828 assert(ITy->getBitWidth() % 2 == 0); 829 return IntegerType::get(Context, ITy->getBitWidth() / 2); 830 } 831 case IITDescriptor::HalfVecArgument: 832 return VectorType::getHalfElementsVectorType(cast<VectorType>( 833 Tys[D.getArgumentNumber()])); 834 case IITDescriptor::SameVecWidthArgument: { 835 Type *EltTy = DecodeFixedType(Infos, Tys, Context); 836 Type *Ty = Tys[D.getArgumentNumber()]; 837 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) { 838 return VectorType::get(EltTy, VTy->getNumElements()); 839 } 840 llvm_unreachable("unhandled"); 841 } 842 case IITDescriptor::PtrToArgument: { 843 Type *Ty = Tys[D.getArgumentNumber()]; 844 return PointerType::getUnqual(Ty); 845 } 846 case IITDescriptor::VecOfPtrsToElt: { 847 Type *Ty = Tys[D.getArgumentNumber()]; 848 VectorType *VTy = dyn_cast<VectorType>(Ty); 849 if (!VTy) 850 llvm_unreachable("Expected an argument of Vector Type"); 851 Type *EltTy = VTy->getVectorElementType(); 852 return VectorType::get(PointerType::getUnqual(EltTy), 853 VTy->getNumElements()); 854 } 855 } 856 llvm_unreachable("unhandled"); 857 } 858 859 860 861 FunctionType *Intrinsic::getType(LLVMContext &Context, 862 ID id, ArrayRef<Type*> Tys) { 863 SmallVector<IITDescriptor, 8> Table; 864 getIntrinsicInfoTableEntries(id, Table); 865 866 ArrayRef<IITDescriptor> TableRef = Table; 867 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context); 868 869 SmallVector<Type*, 8> ArgTys; 870 while (!TableRef.empty()) 871 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context)); 872 873 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg 874 // If we see void type as the type of the last argument, it is vararg intrinsic 875 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) { 876 ArgTys.pop_back(); 877 return FunctionType::get(ResultTy, ArgTys, true); 878 } 879 return FunctionType::get(ResultTy, ArgTys, false); 880 } 881 882 bool Intrinsic::isOverloaded(ID id) { 883 #define GET_INTRINSIC_OVERLOAD_TABLE 884 #include "llvm/IR/Intrinsics.gen" 885 #undef GET_INTRINSIC_OVERLOAD_TABLE 886 } 887 888 bool Intrinsic::isLeaf(ID id) { 889 switch (id) { 890 default: 891 return true; 892 893 case Intrinsic::experimental_gc_statepoint: 894 case Intrinsic::experimental_patchpoint_void: 895 case Intrinsic::experimental_patchpoint_i64: 896 return false; 897 } 898 } 899 900 /// This defines the "Intrinsic::getAttributes(ID id)" method. 901 #define GET_INTRINSIC_ATTRIBUTES 902 #include "llvm/IR/Intrinsics.gen" 903 #undef GET_INTRINSIC_ATTRIBUTES 904 905 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) { 906 // There can never be multiple globals with the same name of different types, 907 // because intrinsics must be a specific type. 908 return 909 cast<Function>(M->getOrInsertFunction(getName(id, Tys), 910 getType(M->getContext(), id, Tys))); 911 } 912 913 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method. 914 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN 915 #include "llvm/IR/Intrinsics.gen" 916 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN 917 918 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method. 919 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN 920 #include "llvm/IR/Intrinsics.gen" 921 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN 922 923 bool Intrinsic::matchIntrinsicType(Type *Ty, ArrayRef<Intrinsic::IITDescriptor> &Infos, 924 SmallVectorImpl<Type*> &ArgTys) { 925 using namespace Intrinsic; 926 927 // If we ran out of descriptors, there are too many arguments. 928 if (Infos.empty()) return true; 929 IITDescriptor D = Infos.front(); 930 Infos = Infos.slice(1); 931 932 switch (D.Kind) { 933 case IITDescriptor::Void: return !Ty->isVoidTy(); 934 case IITDescriptor::VarArg: return true; 935 case IITDescriptor::MMX: return !Ty->isX86_MMXTy(); 936 case IITDescriptor::Token: return !Ty->isTokenTy(); 937 case IITDescriptor::Metadata: return !Ty->isMetadataTy(); 938 case IITDescriptor::Half: return !Ty->isHalfTy(); 939 case IITDescriptor::Float: return !Ty->isFloatTy(); 940 case IITDescriptor::Double: return !Ty->isDoubleTy(); 941 case IITDescriptor::Integer: return !Ty->isIntegerTy(D.Integer_Width); 942 case IITDescriptor::Vector: { 943 VectorType *VT = dyn_cast<VectorType>(Ty); 944 return !VT || VT->getNumElements() != D.Vector_Width || 945 matchIntrinsicType(VT->getElementType(), Infos, ArgTys); 946 } 947 case IITDescriptor::Pointer: { 948 PointerType *PT = dyn_cast<PointerType>(Ty); 949 return !PT || PT->getAddressSpace() != D.Pointer_AddressSpace || 950 matchIntrinsicType(PT->getElementType(), Infos, ArgTys); 951 } 952 953 case IITDescriptor::Struct: { 954 StructType *ST = dyn_cast<StructType>(Ty); 955 if (!ST || ST->getNumElements() != D.Struct_NumElements) 956 return true; 957 958 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i) 959 if (matchIntrinsicType(ST->getElementType(i), Infos, ArgTys)) 960 return true; 961 return false; 962 } 963 964 case IITDescriptor::Argument: 965 // Two cases here - If this is the second occurrence of an argument, verify 966 // that the later instance matches the previous instance. 967 if (D.getArgumentNumber() < ArgTys.size()) 968 return Ty != ArgTys[D.getArgumentNumber()]; 969 970 // Otherwise, if this is the first instance of an argument, record it and 971 // verify the "Any" kind. 972 assert(D.getArgumentNumber() == ArgTys.size() && "Table consistency error"); 973 ArgTys.push_back(Ty); 974 975 switch (D.getArgumentKind()) { 976 case IITDescriptor::AK_Any: return false; // Success 977 case IITDescriptor::AK_AnyInteger: return !Ty->isIntOrIntVectorTy(); 978 case IITDescriptor::AK_AnyFloat: return !Ty->isFPOrFPVectorTy(); 979 case IITDescriptor::AK_AnyVector: return !isa<VectorType>(Ty); 980 case IITDescriptor::AK_AnyPointer: return !isa<PointerType>(Ty); 981 } 982 llvm_unreachable("all argument kinds not covered"); 983 984 case IITDescriptor::ExtendArgument: { 985 // This may only be used when referring to a previous vector argument. 986 if (D.getArgumentNumber() >= ArgTys.size()) 987 return true; 988 989 Type *NewTy = ArgTys[D.getArgumentNumber()]; 990 if (VectorType *VTy = dyn_cast<VectorType>(NewTy)) 991 NewTy = VectorType::getExtendedElementVectorType(VTy); 992 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy)) 993 NewTy = IntegerType::get(ITy->getContext(), 2 * ITy->getBitWidth()); 994 else 995 return true; 996 997 return Ty != NewTy; 998 } 999 case IITDescriptor::TruncArgument: { 1000 // This may only be used when referring to a previous vector argument. 1001 if (D.getArgumentNumber() >= ArgTys.size()) 1002 return true; 1003 1004 Type *NewTy = ArgTys[D.getArgumentNumber()]; 1005 if (VectorType *VTy = dyn_cast<VectorType>(NewTy)) 1006 NewTy = VectorType::getTruncatedElementVectorType(VTy); 1007 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy)) 1008 NewTy = IntegerType::get(ITy->getContext(), ITy->getBitWidth() / 2); 1009 else 1010 return true; 1011 1012 return Ty != NewTy; 1013 } 1014 case IITDescriptor::HalfVecArgument: 1015 // This may only be used when referring to a previous vector argument. 1016 return D.getArgumentNumber() >= ArgTys.size() || 1017 !isa<VectorType>(ArgTys[D.getArgumentNumber()]) || 1018 VectorType::getHalfElementsVectorType( 1019 cast<VectorType>(ArgTys[D.getArgumentNumber()])) != Ty; 1020 case IITDescriptor::SameVecWidthArgument: { 1021 if (D.getArgumentNumber() >= ArgTys.size()) 1022 return true; 1023 VectorType * ReferenceType = 1024 dyn_cast<VectorType>(ArgTys[D.getArgumentNumber()]); 1025 VectorType *ThisArgType = dyn_cast<VectorType>(Ty); 1026 if (!ThisArgType || !ReferenceType || 1027 (ReferenceType->getVectorNumElements() != 1028 ThisArgType->getVectorNumElements())) 1029 return true; 1030 return matchIntrinsicType(ThisArgType->getVectorElementType(), 1031 Infos, ArgTys); 1032 } 1033 case IITDescriptor::PtrToArgument: { 1034 if (D.getArgumentNumber() >= ArgTys.size()) 1035 return true; 1036 Type * ReferenceType = ArgTys[D.getArgumentNumber()]; 1037 PointerType *ThisArgType = dyn_cast<PointerType>(Ty); 1038 return (!ThisArgType || ThisArgType->getElementType() != ReferenceType); 1039 } 1040 case IITDescriptor::VecOfPtrsToElt: { 1041 if (D.getArgumentNumber() >= ArgTys.size()) 1042 return true; 1043 VectorType * ReferenceType = 1044 dyn_cast<VectorType> (ArgTys[D.getArgumentNumber()]); 1045 VectorType *ThisArgVecTy = dyn_cast<VectorType>(Ty); 1046 if (!ThisArgVecTy || !ReferenceType || 1047 (ReferenceType->getVectorNumElements() != 1048 ThisArgVecTy->getVectorNumElements())) 1049 return true; 1050 PointerType *ThisArgEltTy = 1051 dyn_cast<PointerType>(ThisArgVecTy->getVectorElementType()); 1052 if (!ThisArgEltTy) 1053 return true; 1054 return ThisArgEltTy->getElementType() != 1055 ReferenceType->getVectorElementType(); 1056 } 1057 } 1058 llvm_unreachable("unhandled"); 1059 } 1060 1061 bool 1062 Intrinsic::matchIntrinsicVarArg(bool isVarArg, 1063 ArrayRef<Intrinsic::IITDescriptor> &Infos) { 1064 // If there are no descriptors left, then it can't be a vararg. 1065 if (Infos.empty()) 1066 return isVarArg; 1067 1068 // There should be only one descriptor remaining at this point. 1069 if (Infos.size() != 1) 1070 return true; 1071 1072 // Check and verify the descriptor. 1073 IITDescriptor D = Infos.front(); 1074 Infos = Infos.slice(1); 1075 if (D.Kind == IITDescriptor::VarArg) 1076 return !isVarArg; 1077 1078 return true; 1079 } 1080 1081 Optional<Function*> Intrinsic::remangleIntrinsicFunction(Function *F) { 1082 Intrinsic::ID ID = F->getIntrinsicID(); 1083 if (!ID) 1084 return None; 1085 1086 FunctionType *FTy = F->getFunctionType(); 1087 // Accumulate an array of overloaded types for the given intrinsic 1088 SmallVector<Type *, 4> ArgTys; 1089 { 1090 SmallVector<Intrinsic::IITDescriptor, 8> Table; 1091 getIntrinsicInfoTableEntries(ID, Table); 1092 ArrayRef<Intrinsic::IITDescriptor> TableRef = Table; 1093 1094 // If we encounter any problems matching the signature with the descriptor 1095 // just give up remangling. It's up to verifier to report the discrepancy. 1096 if (Intrinsic::matchIntrinsicType(FTy->getReturnType(), TableRef, ArgTys)) 1097 return None; 1098 for (auto Ty : FTy->params()) 1099 if (Intrinsic::matchIntrinsicType(Ty, TableRef, ArgTys)) 1100 return None; 1101 if (Intrinsic::matchIntrinsicVarArg(FTy->isVarArg(), TableRef)) 1102 return None; 1103 } 1104 1105 StringRef Name = F->getName(); 1106 if (Name == Intrinsic::getName(ID, ArgTys)) 1107 return None; 1108 1109 auto NewDecl = Intrinsic::getDeclaration(F->getParent(), ID, ArgTys); 1110 NewDecl->setCallingConv(F->getCallingConv()); 1111 assert(NewDecl->getFunctionType() == FTy && "Shouldn't change the signature"); 1112 return NewDecl; 1113 } 1114 1115 /// hasAddressTaken - returns true if there are any uses of this function 1116 /// other than direct calls or invokes to it. 1117 bool Function::hasAddressTaken(const User* *PutOffender) const { 1118 for (const Use &U : uses()) { 1119 const User *FU = U.getUser(); 1120 if (isa<BlockAddress>(FU)) 1121 continue; 1122 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU)) { 1123 if (PutOffender) 1124 *PutOffender = FU; 1125 return true; 1126 } 1127 ImmutableCallSite CS(cast<Instruction>(FU)); 1128 if (!CS.isCallee(&U)) { 1129 if (PutOffender) 1130 *PutOffender = FU; 1131 return true; 1132 } 1133 } 1134 return false; 1135 } 1136 1137 bool Function::isDefTriviallyDead() const { 1138 // Check the linkage 1139 if (!hasLinkOnceLinkage() && !hasLocalLinkage() && 1140 !hasAvailableExternallyLinkage()) 1141 return false; 1142 1143 // Check if the function is used by anything other than a blockaddress. 1144 for (const User *U : users()) 1145 if (!isa<BlockAddress>(U)) 1146 return false; 1147 1148 return true; 1149 } 1150 1151 /// callsFunctionThatReturnsTwice - Return true if the function has a call to 1152 /// setjmp or other function that gcc recognizes as "returning twice". 1153 bool Function::callsFunctionThatReturnsTwice() const { 1154 for (const_inst_iterator 1155 I = inst_begin(this), E = inst_end(this); I != E; ++I) { 1156 ImmutableCallSite CS(&*I); 1157 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice)) 1158 return true; 1159 } 1160 1161 return false; 1162 } 1163 1164 Constant *Function::getPersonalityFn() const { 1165 assert(hasPersonalityFn() && getNumOperands()); 1166 return cast<Constant>(Op<0>()); 1167 } 1168 1169 void Function::setPersonalityFn(Constant *Fn) { 1170 setHungoffOperand<0>(Fn); 1171 setValueSubclassDataBit(3, Fn != nullptr); 1172 } 1173 1174 Constant *Function::getPrefixData() const { 1175 assert(hasPrefixData() && getNumOperands()); 1176 return cast<Constant>(Op<1>()); 1177 } 1178 1179 void Function::setPrefixData(Constant *PrefixData) { 1180 setHungoffOperand<1>(PrefixData); 1181 setValueSubclassDataBit(1, PrefixData != nullptr); 1182 } 1183 1184 Constant *Function::getPrologueData() const { 1185 assert(hasPrologueData() && getNumOperands()); 1186 return cast<Constant>(Op<2>()); 1187 } 1188 1189 void Function::setPrologueData(Constant *PrologueData) { 1190 setHungoffOperand<2>(PrologueData); 1191 setValueSubclassDataBit(2, PrologueData != nullptr); 1192 } 1193 1194 void Function::allocHungoffUselist() { 1195 // If we've already allocated a uselist, stop here. 1196 if (getNumOperands()) 1197 return; 1198 1199 allocHungoffUses(3, /*IsPhi=*/ false); 1200 setNumHungOffUseOperands(3); 1201 1202 // Initialize the uselist with placeholder operands to allow traversal. 1203 auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0)); 1204 Op<0>().set(CPN); 1205 Op<1>().set(CPN); 1206 Op<2>().set(CPN); 1207 } 1208 1209 template <int Idx> 1210 void Function::setHungoffOperand(Constant *C) { 1211 if (C) { 1212 allocHungoffUselist(); 1213 Op<Idx>().set(C); 1214 } else if (getNumOperands()) { 1215 Op<Idx>().set( 1216 ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0))); 1217 } 1218 } 1219 1220 void Function::setValueSubclassDataBit(unsigned Bit, bool On) { 1221 assert(Bit < 16 && "SubclassData contains only 16 bits"); 1222 if (On) 1223 setValueSubclassData(getSubclassDataFromValue() | (1 << Bit)); 1224 else 1225 setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit)); 1226 } 1227 1228 void Function::setEntryCount(uint64_t Count) { 1229 MDBuilder MDB(getContext()); 1230 setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count)); 1231 } 1232 1233 Optional<uint64_t> Function::getEntryCount() const { 1234 MDNode *MD = getMetadata(LLVMContext::MD_prof); 1235 if (MD && MD->getOperand(0)) 1236 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0))) 1237 if (MDS->getString().equals("function_entry_count")) { 1238 ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1)); 1239 return CI->getValue().getZExtValue(); 1240 } 1241 return None; 1242 } 1243