lib/IR/Function.cpp

   1 //===- Function.cpp - Implement the Global object classes -----------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the Function class for the IR library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/IR/Function.h"
  14 #include "SymbolTableListTraitsImpl.h"
  15 #include "llvm/ADT/ArrayRef.h"
  16 #include "llvm/ADT/DenseSet.h"
  17 #include "llvm/ADT/None.h"
  18 #include "llvm/ADT/STLExtras.h"
  19 #include "llvm/ADT/SmallString.h"
  20 #include "llvm/ADT/SmallVector.h"
  21 #include "llvm/ADT/StringExtras.h"
  22 #include "llvm/ADT/StringRef.h"
  23 #include "llvm/IR/Argument.h"
  24 #include "llvm/IR/Attributes.h"
  25 #include "llvm/IR/BasicBlock.h"
  26 #include "llvm/IR/Constant.h"
  27 #include "llvm/IR/Constants.h"
  28 #include "llvm/IR/DerivedTypes.h"
  29 #include "llvm/IR/GlobalValue.h"
  30 #include "llvm/IR/InstIterator.h"
  31 #include "llvm/IR/Instruction.h"
  32 #include "llvm/IR/Instructions.h"
  33 #include "llvm/IR/IntrinsicInst.h"
  34 #include "llvm/IR/Intrinsics.h"
  35 #include "llvm/IR/LLVMContext.h"
  36 #include "llvm/IR/MDBuilder.h"
  37 #include "llvm/IR/Metadata.h"
  38 #include "llvm/IR/Module.h"
  39 #include "llvm/IR/SymbolTableListTraits.h"
  40 #include "llvm/IR/Type.h"
  41 #include "llvm/IR/Use.h"
  42 #include "llvm/IR/User.h"
  43 #include "llvm/IR/Value.h"
  44 #include "llvm/IR/ValueSymbolTable.h"
  45 #include "llvm/Support/Casting.h"
  46 #include "llvm/Support/Compiler.h"
  47 #include "llvm/Support/ErrorHandling.h"
  48 #include <algorithm>
  49 #include <cassert>
  50 #include <cstddef>
  51 #include <cstdint>
  52 #include <cstring>
  53 #include <string>
  54
  55 using namespace llvm;
  56 using ProfileCount = Function::ProfileCount;
  57
  58 // Explicit instantiations of SymbolTableListTraits since some of the methods
  59 // are not in the public header file...
  60 template class llvm::SymbolTableListTraits<BasicBlock>;
  61
  62 //===----------------------------------------------------------------------===//
  63 // Argument Implementation
  64 //===----------------------------------------------------------------------===//
  65
  66 Argument::Argument(Type *Ty, const Twine &Name, Function *Par, unsigned ArgNo)
  67     : Value(Ty, Value::ArgumentVal), Parent(Par), ArgNo(ArgNo) {
  68   setName(Name);
  69 }
  70
  71 void Argument::setParent(Function *parent) {
  72   Parent = parent;
  73 }
  74
  75 bool Argument::hasNonNullAttr() const {
  76   if (!getType()->isPointerTy()) return false;
  77   if (getParent()->hasParamAttribute(getArgNo(), Attribute::NonNull))
  78     return true;
  79   else if (getDereferenceableBytes() > 0 &&
  80            !NullPointerIsDefined(getParent(),
  81                                  getType()->getPointerAddressSpace()))
  82     return true;
  83   return false;
  84 }
  85
  86 bool Argument::hasByValAttr() const {
  87   if (!getType()->isPointerTy()) return false;
  88   return hasAttribute(Attribute::ByVal);
  89 }
  90
  91 bool Argument::hasSwiftSelfAttr() const {
  92   return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftSelf);
  93 }
  94
  95 bool Argument::hasSwiftErrorAttr() const {
  96   return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftError);
  97 }
  98
  99 bool Argument::hasInAllocaAttr() const {
 100   if (!getType()->isPointerTy()) return false;
 101   return hasAttribute(Attribute::InAlloca);
 102 }
 103
 104 bool Argument::hasByValOrInAllocaAttr() const {
 105   if (!getType()->isPointerTy()) return false;
 106   AttributeList Attrs = getParent()->getAttributes();
 107   return Attrs.hasParamAttribute(getArgNo(), Attribute::ByVal) ||
 108          Attrs.hasParamAttribute(getArgNo(), Attribute::InAlloca);
 109 }
 110
 111 unsigned Argument::getParamAlignment() const {
 112   assert(getType()->isPointerTy() && "Only pointers have alignments");
 113   return getParent()->getParamAlignment(getArgNo());
 114 }
 115
 116 Type *Argument::getParamByValType() const {
 117   assert(getType()->isPointerTy() && "Only pointers have byval types");
 118   return getParent()->getParamByValType(getArgNo());
 119 }
 120
 121 uint64_t Argument::getDereferenceableBytes() const {
 122   assert(getType()->isPointerTy() &&
 123          "Only pointers have dereferenceable bytes");
 124   return getParent()->getParamDereferenceableBytes(getArgNo());
 125 }
 126
 127 uint64_t Argument::getDereferenceableOrNullBytes() const {
 128   assert(getType()->isPointerTy() &&
 129          "Only pointers have dereferenceable bytes");
 130   return getParent()->getParamDereferenceableOrNullBytes(getArgNo());
 131 }
 132
 133 bool Argument::hasNestAttr() const {
 134   if (!getType()->isPointerTy()) return false;
 135   return hasAttribute(Attribute::Nest);
 136 }
 137
 138 bool Argument::hasNoAliasAttr() const {
 139   if (!getType()->isPointerTy()) return false;
 140   return hasAttribute(Attribute::NoAlias);
 141 }
 142
 143 bool Argument::hasNoCaptureAttr() const {
 144   if (!getType()->isPointerTy()) return false;
 145   return hasAttribute(Attribute::NoCapture);
 146 }
 147
 148 bool Argument::hasStructRetAttr() const {
 149   if (!getType()->isPointerTy()) return false;
 150   return hasAttribute(Attribute::StructRet);
 151 }
 152
 153 bool Argument::hasInRegAttr() const {
 154   return hasAttribute(Attribute::InReg);
 155 }
 156
 157 bool Argument::hasReturnedAttr() const {
 158   return hasAttribute(Attribute::Returned);
 159 }
 160
 161 bool Argument::hasZExtAttr() const {
 162   return hasAttribute(Attribute::ZExt);
 163 }
 164
 165 bool Argument::hasSExtAttr() const {
 166   return hasAttribute(Attribute::SExt);
 167 }
 168
 169 bool Argument::onlyReadsMemory() const {
 170   AttributeList Attrs = getParent()->getAttributes();
 171   return Attrs.hasParamAttribute(getArgNo(), Attribute::ReadOnly) ||
 172          Attrs.hasParamAttribute(getArgNo(), Attribute::ReadNone);
 173 }
 174
 175 void Argument::addAttrs(AttrBuilder &B) {
 176   AttributeList AL = getParent()->getAttributes();
 177   AL = AL.addParamAttributes(Parent->getContext(), getArgNo(), B);
 178   getParent()->setAttributes(AL);
 179 }
 180
 181 void Argument::addAttr(Attribute::AttrKind Kind) {
 182   getParent()->addParamAttr(getArgNo(), Kind);
 183 }
 184
 185 void Argument::addAttr(Attribute Attr) {
 186   getParent()->addParamAttr(getArgNo(), Attr);
 187 }
 188
 189 void Argument::removeAttr(Attribute::AttrKind Kind) {
 190   getParent()->removeParamAttr(getArgNo(), Kind);
 191 }
 192
 193 bool Argument::hasAttribute(Attribute::AttrKind Kind) const {
 194   return getParent()->hasParamAttribute(getArgNo(), Kind);
 195 }
 196
 197 Attribute Argument::getAttribute(Attribute::AttrKind Kind) const {
 198   return getParent()->getParamAttribute(getArgNo(), Kind);
 199 }
 200
 201 //===----------------------------------------------------------------------===//
 202 // Helper Methods in Function
 203 //===----------------------------------------------------------------------===//
 204
 205 LLVMContext &Function::getContext() const {
 206   return getType()->getContext();
 207 }
 208
 209 unsigned Function::getInstructionCount() const {
 210   unsigned NumInstrs = 0;
 211   for (const BasicBlock &BB : BasicBlocks)
 212     NumInstrs += std::distance(BB.instructionsWithoutDebug().begin(),
 213                                BB.instructionsWithoutDebug().end());
 214   return NumInstrs;
 215 }
 216
 217 Function *Function::Create(FunctionType *Ty, LinkageTypes Linkage,
 218                            const Twine &N, Module &M) {
 219   return Create(Ty, Linkage, M.getDataLayout().getProgramAddressSpace(), N, &M);
 220 }
 221
 222 void Function::removeFromParent() {
 223   getParent()->getFunctionList().remove(getIterator());
 224 }
 225
 226 void Function::eraseFromParent() {
 227   getParent()->getFunctionList().erase(getIterator());
 228 }
 229
 230 //===----------------------------------------------------------------------===//
 231 // Function Implementation
 232 //===----------------------------------------------------------------------===//
 233
 234 static unsigned computeAddrSpace(unsigned AddrSpace, Module *M) {
 235   // If AS == -1 and we are passed a valid module pointer we place the function
 236   // in the program address space. Otherwise we default to AS0.
 237   if (AddrSpace == static_cast<unsigned>(-1))
 238     return M ? M->getDataLayout().getProgramAddressSpace() : 0;
 239   return AddrSpace;
 240 }
 241
 242 Function::Function(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace,
 243                    const Twine &name, Module *ParentModule)
 244     : GlobalObject(Ty, Value::FunctionVal,
 245                    OperandTraits<Function>::op_begin(this), 0, Linkage, name,
 246                    computeAddrSpace(AddrSpace, ParentModule)),
 247       NumArgs(Ty->getNumParams()) {
 248   assert(FunctionType::isValidReturnType(getReturnType()) &&
 249          "invalid return type");
 250   setGlobalObjectSubClassData(0);
 251
 252   // We only need a symbol table for a function if the context keeps value names
 253   if (!getContext().shouldDiscardValueNames())
 254     SymTab = std::make_unique<ValueSymbolTable>();
 255
 256   // If the function has arguments, mark them as lazily built.
 257   if (Ty->getNumParams())
 258     setValueSubclassData(1);   // Set the "has lazy arguments" bit.
 259
 260   if (ParentModule)
 261     ParentModule->getFunctionList().push_back(this);
 262
 263   HasLLVMReservedName = getName().startswith("llvm.");
 264   // Ensure intrinsics have the right parameter attributes.
 265   // Note, the IntID field will have been set in Value::setName if this function
 266   // name is a valid intrinsic ID.
 267   if (IntID)
 268     setAttributes(Intrinsic::getAttributes(getContext(), IntID));
 269 }
 270
 271 Function::~Function() {
 272   dropAllReferences();    // After this it is safe to delete instructions.
 273
 274   // Delete all of the method arguments and unlink from symbol table...
 275   if (Arguments)
 276     clearArguments();
 277
 278   // Remove the function from the on-the-side GC table.
 279   clearGC();
 280 }
 281
 282 void Function::BuildLazyArguments() const {
 283   // Create the arguments vector, all arguments start out unnamed.
 284   auto *FT = getFunctionType();
 285   if (NumArgs > 0) {
 286     Arguments = std::allocator<Argument>().allocate(NumArgs);
 287     for (unsigned i = 0, e = NumArgs; i != e; ++i) {
 288       Type *ArgTy = FT->getParamType(i);
 289       assert(!ArgTy->isVoidTy() && "Cannot have void typed arguments!");
 290       new (Arguments + i) Argument(ArgTy, "", const_cast<Function *>(this), i);
 291     }
 292   }
 293
 294   // Clear the lazy arguments bit.
 295   unsigned SDC = getSubclassDataFromValue();
 296   const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
 297   assert(!hasLazyArguments());
 298 }
 299
 300 static MutableArrayRef<Argument> makeArgArray(Argument *Args, size_t Count) {
 301   return MutableArrayRef<Argument>(Args, Count);
 302 }
 303
 304 void Function::clearArguments() {
 305   for (Argument &A : makeArgArray(Arguments, NumArgs)) {
 306     A.setName("");
 307     A.~Argument();
 308   }
 309   std::allocator<Argument>().deallocate(Arguments, NumArgs);
 310   Arguments = nullptr;
 311 }
 312
 313 void Function::stealArgumentListFrom(Function &Src) {
 314   assert(isDeclaration() && "Expected no references to current arguments");
 315
 316   // Drop the current arguments, if any, and set the lazy argument bit.
 317   if (!hasLazyArguments()) {
 318     assert(llvm::all_of(makeArgArray(Arguments, NumArgs),
 319                         [](const Argument &A) { return A.use_empty(); }) &&
 320            "Expected arguments to be unused in declaration");
 321     clearArguments();
 322     setValueSubclassData(getSubclassDataFromValue() | (1 << 0));
 323   }
 324
 325   // Nothing to steal if Src has lazy arguments.
 326   if (Src.hasLazyArguments())
 327     return;
 328
 329   // Steal arguments from Src, and fix the lazy argument bits.
 330   assert(arg_size() == Src.arg_size());
 331   Arguments = Src.Arguments;
 332   Src.Arguments = nullptr;
 333   for (Argument &A : makeArgArray(Arguments, NumArgs)) {
 334     // FIXME: This does the work of transferNodesFromList inefficiently.
 335     SmallString<128> Name;
 336     if (A.hasName())
 337       Name = A.getName();
 338     if (!Name.empty())
 339       A.setName("");
 340     A.setParent(this);
 341     if (!Name.empty())
 342       A.setName(Name);
 343   }
 344
 345   setValueSubclassData(getSubclassDataFromValue() & ~(1 << 0));
 346   assert(!hasLazyArguments());
 347   Src.setValueSubclassData(Src.getSubclassDataFromValue() | (1 << 0));
 348 }
 349
 350 // dropAllReferences() - This function causes all the subinstructions to "let
 351 // go" of all references that they are maintaining.  This allows one to
 352 // 'delete' a whole class at a time, even though there may be circular
 353 // references... first all references are dropped, and all use counts go to
 354 // zero.  Then everything is deleted for real.  Note that no operations are
 355 // valid on an object that has "dropped all references", except operator
 356 // delete.
 357 //
 358 void Function::dropAllReferences() {
 359   setIsMaterializable(false);
 360
 361   for (BasicBlock &BB : *this)
 362     BB.dropAllReferences();
 363
 364   // Delete all basic blocks. They are now unused, except possibly by
 365   // blockaddresses, but BasicBlock's destructor takes care of those.
 366   while (!BasicBlocks.empty())
 367     BasicBlocks.begin()->eraseFromParent();
 368
 369   // Drop uses of any optional data (real or placeholder).
 370   if (getNumOperands()) {
 371     User::dropAllReferences();
 372     setNumHungOffUseOperands(0);
 373     setValueSubclassData(getSubclassDataFromValue() & ~0xe);
 374   }
 375
 376   // Metadata is stored in a side-table.
 377   clearMetadata();
 378 }
 379
 380 void Function::addAttribute(unsigned i, Attribute::AttrKind Kind) {
 381   AttributeList PAL = getAttributes();
 382   PAL = PAL.addAttribute(getContext(), i, Kind);
 383   setAttributes(PAL);
 384 }
 385
 386 void Function::addAttribute(unsigned i, Attribute Attr) {
 387   AttributeList PAL = getAttributes();
 388   PAL = PAL.addAttribute(getContext(), i, Attr);
 389   setAttributes(PAL);
 390 }
 391
 392 void Function::addAttributes(unsigned i, const AttrBuilder &Attrs) {
 393   AttributeList PAL = getAttributes();
 394   PAL = PAL.addAttributes(getContext(), i, Attrs);
 395   setAttributes(PAL);
 396 }
 397
 398 void Function::addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
 399   AttributeList PAL = getAttributes();
 400   PAL = PAL.addParamAttribute(getContext(), ArgNo, Kind);
 401   setAttributes(PAL);
 402 }
 403
 404 void Function::addParamAttr(unsigned ArgNo, Attribute Attr) {
 405   AttributeList PAL = getAttributes();
 406   PAL = PAL.addParamAttribute(getContext(), ArgNo, Attr);
 407   setAttributes(PAL);
 408 }
 409
 410 void Function::addParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
 411   AttributeList PAL = getAttributes();
 412   PAL = PAL.addParamAttributes(getContext(), ArgNo, Attrs);
 413   setAttributes(PAL);
 414 }
 415
 416 void Function::removeAttribute(unsigned i, Attribute::AttrKind Kind) {
 417   AttributeList PAL = getAttributes();
 418   PAL = PAL.removeAttribute(getContext(), i, Kind);
 419   setAttributes(PAL);
 420 }
 421
 422 void Function::removeAttribute(unsigned i, StringRef Kind) {
 423   AttributeList PAL = getAttributes();
 424   PAL = PAL.removeAttribute(getContext(), i, Kind);
 425   setAttributes(PAL);
 426 }
 427
 428 void Function::removeAttributes(unsigned i, const AttrBuilder &Attrs) {
 429   AttributeList PAL = getAttributes();
 430   PAL = PAL.removeAttributes(getContext(), i, Attrs);
 431   setAttributes(PAL);
 432 }
 433
 434 void Function::removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
 435   AttributeList PAL = getAttributes();
 436   PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
 437   setAttributes(PAL);
 438 }
 439
 440 void Function::removeParamAttr(unsigned ArgNo, StringRef Kind) {
 441   AttributeList PAL = getAttributes();
 442   PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
 443   setAttributes(PAL);
 444 }
 445
 446 void Function::removeParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
 447   AttributeList PAL = getAttributes();
 448   PAL = PAL.removeParamAttributes(getContext(), ArgNo, Attrs);
 449   setAttributes(PAL);
 450 }
 451
 452 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
 453   AttributeList PAL = getAttributes();
 454   PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
 455   setAttributes(PAL);
 456 }
 457
 458 void Function::addDereferenceableParamAttr(unsigned ArgNo, uint64_t Bytes) {
 459   AttributeList PAL = getAttributes();
 460   PAL = PAL.addDereferenceableParamAttr(getContext(), ArgNo, Bytes);
 461   setAttributes(PAL);
 462 }
 463
 464 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
 465   AttributeList PAL = getAttributes();
 466   PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
 467   setAttributes(PAL);
 468 }
 469
 470 void Function::addDereferenceableOrNullParamAttr(unsigned ArgNo,
 471                                                  uint64_t Bytes) {
 472   AttributeList PAL = getAttributes();
 473   PAL = PAL.addDereferenceableOrNullParamAttr(getContext(), ArgNo, Bytes);
 474   setAttributes(PAL);
 475 }
 476
 477 const std::string &Function::getGC() const {
 478   assert(hasGC() && "Function has no collector");
 479   return getContext().getGC(*this);
 480 }
 481
 482 void Function::setGC(std::string Str) {
 483   setValueSubclassDataBit(14, !Str.empty());
 484   getContext().setGC(*this, std::move(Str));
 485 }
 486
 487 void Function::clearGC() {
 488   if (!hasGC())
 489     return;
 490   getContext().deleteGC(*this);
 491   setValueSubclassDataBit(14, false);
 492 }
 493
 494 /// Copy all additional attributes (those not needed to create a Function) from
 495 /// the Function Src to this one.
 496 void Function::copyAttributesFrom(const Function *Src) {
 497   GlobalObject::copyAttributesFrom(Src);
 498   setCallingConv(Src->getCallingConv());
 499   setAttributes(Src->getAttributes());
 500   if (Src->hasGC())
 501     setGC(Src->getGC());
 502   else
 503     clearGC();
 504   if (Src->hasPersonalityFn())
 505     setPersonalityFn(Src->getPersonalityFn());
 506   if (Src->hasPrefixData())
 507     setPrefixData(Src->getPrefixData());
 508   if (Src->hasPrologueData())
 509     setPrologueData(Src->getPrologueData());
 510 }
 511
 512 /// Table of string intrinsic names indexed by enum value.
 513 static const char * const IntrinsicNameTable[] = {
 514   "not_intrinsic",
 515 #define GET_INTRINSIC_NAME_TABLE
 516 #include "llvm/IR/IntrinsicImpl.inc"
 517 #undef GET_INTRINSIC_NAME_TABLE
 518 };
 519
 520 /// Table of per-target intrinsic name tables.
 521 #define GET_INTRINSIC_TARGET_DATA
 522 #include "llvm/IR/IntrinsicImpl.inc"
 523 #undef GET_INTRINSIC_TARGET_DATA
 524
 525 /// Find the segment of \c IntrinsicNameTable for intrinsics with the same
 526 /// target as \c Name, or the generic table if \c Name is not target specific.
 527 ///
 528 /// Returns the relevant slice of \c IntrinsicNameTable
 529 static ArrayRef<const char *> findTargetSubtable(StringRef Name) {
 530   assert(Name.startswith("llvm."));
 531
 532   ArrayRef<IntrinsicTargetInfo> Targets(TargetInfos);
 533   // Drop "llvm." and take the first dotted component. That will be the target
 534   // if this is target specific.
 535   StringRef Target = Name.drop_front(5).split('.').first;
 536   auto It = partition_point(
 537       Targets, [=](const IntrinsicTargetInfo &TI) { return TI.Name < Target; });
 538   // We've either found the target or just fall back to the generic set, which
 539   // is always first.
 540   const auto &TI = It != Targets.end() && It->Name == Target ? *It : Targets[0];
 541   return makeArrayRef(&IntrinsicNameTable[1] + TI.Offset, TI.Count);
 542 }
 543
 544 /// This does the actual lookup of an intrinsic ID which
 545 /// matches the given function name.
 546 Intrinsic::ID Function::lookupIntrinsicID(StringRef Name) {
 547   ArrayRef<const char *> NameTable = findTargetSubtable(Name);
 548   int Idx = Intrinsic::lookupLLVMIntrinsicByName(NameTable, Name);
 549   if (Idx == -1)
 550     return Intrinsic::not_intrinsic;
 551
 552   // Intrinsic IDs correspond to the location in IntrinsicNameTable, but we have
 553   // an index into a sub-table.
 554   int Adjust = NameTable.data() - IntrinsicNameTable;
 555   Intrinsic::ID ID = static_cast<Intrinsic::ID>(Idx + Adjust);
 556
 557   // If the intrinsic is not overloaded, require an exact match. If it is
 558   // overloaded, require either exact or prefix match.
 559   const auto MatchSize = strlen(NameTable[Idx]);
 560   assert(Name.size() >= MatchSize && "Expected either exact or prefix match");
 561   bool IsExactMatch = Name.size() == MatchSize;
 562   return IsExactMatch || isOverloaded(ID) ? ID : Intrinsic::not_intrinsic;
 563 }
 564
 565 void Function::recalculateIntrinsicID() {
 566   StringRef Name = getName();
 567   if (!Name.startswith("llvm.")) {
 568     HasLLVMReservedName = false;
 569     IntID = Intrinsic::not_intrinsic;
 570     return;
 571   }
 572   HasLLVMReservedName = true;
 573   IntID = lookupIntrinsicID(Name);
 574 }
 575
 576 /// Returns a stable mangling for the type specified for use in the name
 577 /// mangling scheme used by 'any' types in intrinsic signatures.  The mangling
 578 /// of named types is simply their name.  Manglings for unnamed types consist
 579 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
 580 /// combined with the mangling of their component types.  A vararg function
 581 /// type will have a suffix of 'vararg'.  Since function types can contain
 582 /// other function types, we close a function type mangling with suffix 'f'
 583 /// which can't be confused with it's prefix.  This ensures we don't have
 584 /// collisions between two unrelated function types. Otherwise, you might
 585 /// parse ffXX as f(fXX) or f(fX)X.  (X is a placeholder for any other type.)
 586 ///
 587 static std::string getMangledTypeStr(Type* Ty) {
 588   std::string Result;
 589   if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
 590     Result += "p" + utostr(PTyp->getAddressSpace()) +
 591       getMangledTypeStr(PTyp->getElementType());
 592   } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
 593     Result += "a" + utostr(ATyp->getNumElements()) +
 594       getMangledTypeStr(ATyp->getElementType());
 595   } else if (StructType *STyp = dyn_cast<StructType>(Ty)) {
 596     if (!STyp->isLiteral()) {
 597       Result += "s_";
 598       Result += STyp->getName();
 599     } else {
 600       Result += "sl_";
 601       for (auto Elem : STyp->elements())
 602         Result += getMangledTypeStr(Elem);
 603     }
 604     // Ensure nested structs are distinguishable.
 605     Result += "s";
 606   } else if (FunctionType *FT = dyn_cast<FunctionType>(Ty)) {
 607     Result += "f_" + getMangledTypeStr(FT->getReturnType());
 608     for (size_t i = 0; i < FT->getNumParams(); i++)
 609       Result += getMangledTypeStr(FT->getParamType(i));
 610     if (FT->isVarArg())
 611       Result += "vararg";
 612     // Ensure nested function types are distinguishable.
 613     Result += "f";
 614   } else if (VectorType* VTy = dyn_cast<VectorType>(Ty)) {
 615     if (VTy->isScalable())
 616       Result += "nx";
 617     Result += "v" + utostr(VTy->getVectorNumElements()) +
 618       getMangledTypeStr(VTy->getVectorElementType());
 619   } else if (Ty) {
 620     switch (Ty->getTypeID()) {
 621     default: llvm_unreachable("Unhandled type");
 622     case Type::VoidTyID:      Result += "isVoid";   break;
 623     case Type::MetadataTyID:  Result += "Metadata"; break;
 624     case Type::HalfTyID:      Result += "f16";      break;
 625     case Type::FloatTyID:     Result += "f32";      break;
 626     case Type::DoubleTyID:    Result += "f64";      break;
 627     case Type::X86_FP80TyID:  Result += "f80";      break;
 628     case Type::FP128TyID:     Result += "f128";     break;
 629     case Type::PPC_FP128TyID: Result += "ppcf128";  break;
 630     case Type::X86_MMXTyID:   Result += "x86mmx";   break;
 631     case Type::IntegerTyID:
 632       Result += "i" + utostr(cast<IntegerType>(Ty)->getBitWidth());
 633       break;
 634     }
 635   }
 636   return Result;
 637 }
 638
 639 StringRef Intrinsic::getName(ID id) {
 640   assert(id < num_intrinsics && "Invalid intrinsic ID!");
 641   assert(!isOverloaded(id) &&
 642          "This version of getName does not support overloading");
 643   return IntrinsicNameTable[id];
 644 }
 645
 646 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
 647   assert(id < num_intrinsics && "Invalid intrinsic ID!");
 648   std::string Result(IntrinsicNameTable[id]);
 649   for (Type *Ty : Tys) {
 650     Result += "." + getMangledTypeStr(Ty);
 651   }
 652   return Result;
 653 }
 654
 655 /// IIT_Info - These are enumerators that describe the entries returned by the
 656 /// getIntrinsicInfoTableEntries function.
 657 ///
 658 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
 659 enum IIT_Info {
 660   // Common values should be encoded with 0-15.
 661   IIT_Done = 0,
 662   IIT_I1   = 1,
 663   IIT_I8   = 2,
 664   IIT_I16  = 3,
 665   IIT_I32  = 4,
 666   IIT_I64  = 5,
 667   IIT_F16  = 6,
 668   IIT_F32  = 7,
 669   IIT_F64  = 8,
 670   IIT_V2   = 9,
 671   IIT_V4   = 10,
 672   IIT_V8   = 11,
 673   IIT_V16  = 12,
 674   IIT_V32  = 13,
 675   IIT_PTR  = 14,
 676   IIT_ARG  = 15,
 677
 678   // Values from 16+ are only encodable with the inefficient encoding.
 679   IIT_V64  = 16,
 680   IIT_MMX  = 17,
 681   IIT_TOKEN = 18,
 682   IIT_METADATA = 19,
 683   IIT_EMPTYSTRUCT = 20,
 684   IIT_STRUCT2 = 21,
 685   IIT_STRUCT3 = 22,
 686   IIT_STRUCT4 = 23,
 687   IIT_STRUCT5 = 24,
 688   IIT_EXTEND_ARG = 25,
 689   IIT_TRUNC_ARG = 26,
 690   IIT_ANYPTR = 27,
 691   IIT_V1   = 28,
 692   IIT_VARARG = 29,
 693   IIT_HALF_VEC_ARG = 30,
 694   IIT_SAME_VEC_WIDTH_ARG = 31,
 695   IIT_PTR_TO_ARG = 32,
 696   IIT_PTR_TO_ELT = 33,
 697   IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
 698   IIT_I128 = 35,
 699   IIT_V512 = 36,
 700   IIT_V1024 = 37,
 701   IIT_STRUCT6 = 38,
 702   IIT_STRUCT7 = 39,
 703   IIT_STRUCT8 = 40,
 704   IIT_F128 = 41,
 705   IIT_VEC_ELEMENT = 42,
 706   IIT_SCALABLE_VEC = 43
 707 };
 708
 709 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
 710                       SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
 711   using namespace Intrinsic;
 712
 713   IIT_Info Info = IIT_Info(Infos[NextElt++]);
 714   unsigned StructElts = 2;
 715
 716   switch (Info) {
 717   case IIT_Done:
 718     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
 719     return;
 720   case IIT_VARARG:
 721     OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
 722     return;
 723   case IIT_MMX:
 724     OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
 725     return;
 726   case IIT_TOKEN:
 727     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0));
 728     return;
 729   case IIT_METADATA:
 730     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
 731     return;
 732   case IIT_F16:
 733     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
 734     return;
 735   case IIT_F32:
 736     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
 737     return;
 738   case IIT_F64:
 739     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
 740     return;
 741   case IIT_F128:
 742     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Quad, 0));
 743     return;
 744   case IIT_I1:
 745     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
 746     return;
 747   case IIT_I8:
 748     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
 749     return;
 750   case IIT_I16:
 751     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
 752     return;
 753   case IIT_I32:
 754     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
 755     return;
 756   case IIT_I64:
 757     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
 758     return;
 759   case IIT_I128:
 760     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128));
 761     return;
 762   case IIT_V1:
 763     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
 764     DecodeIITType(NextElt, Infos, OutputTable);
 765     return;
 766   case IIT_V2:
 767     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
 768     DecodeIITType(NextElt, Infos, OutputTable);
 769     return;
 770   case IIT_V4:
 771     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
 772     DecodeIITType(NextElt, Infos, OutputTable);
 773     return;
 774   case IIT_V8:
 775     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
 776     DecodeIITType(NextElt, Infos, OutputTable);
 777     return;
 778   case IIT_V16:
 779     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
 780     DecodeIITType(NextElt, Infos, OutputTable);
 781     return;
 782   case IIT_V32:
 783     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
 784     DecodeIITType(NextElt, Infos, OutputTable);
 785     return;
 786   case IIT_V64:
 787     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
 788     DecodeIITType(NextElt, Infos, OutputTable);
 789     return;
 790   case IIT_V512:
 791     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 512));
 792     DecodeIITType(NextElt, Infos, OutputTable);
 793     return;
 794   case IIT_V1024:
 795     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1024));
 796     DecodeIITType(NextElt, Infos, OutputTable);
 797     return;
 798   case IIT_PTR:
 799     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
 800     DecodeIITType(NextElt, Infos, OutputTable);
 801     return;
 802   case IIT_ANYPTR: {  // [ANYPTR addrspace, subtype]
 803     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
 804                                              Infos[NextElt++]));
 805     DecodeIITType(NextElt, Infos, OutputTable);
 806     return;
 807   }
 808   case IIT_ARG: {
 809     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 810     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
 811     return;
 812   }
 813   case IIT_EXTEND_ARG: {
 814     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 815     OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
 816                                              ArgInfo));
 817     return;
 818   }
 819   case IIT_TRUNC_ARG: {
 820     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 821     OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
 822                                              ArgInfo));
 823     return;
 824   }
 825   case IIT_HALF_VEC_ARG: {
 826     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 827     OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
 828                                              ArgInfo));
 829     return;
 830   }
 831   case IIT_SAME_VEC_WIDTH_ARG: {
 832     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 833     OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
 834                                              ArgInfo));
 835     return;
 836   }
 837   case IIT_PTR_TO_ARG: {
 838     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 839     OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
 840                                              ArgInfo));
 841     return;
 842   }
 843   case IIT_PTR_TO_ELT: {
 844     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 845     OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToElt, ArgInfo));
 846     return;
 847   }
 848   case IIT_VEC_OF_ANYPTRS_TO_ELT: {
 849     unsigned short ArgNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 850     unsigned short RefNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 851     OutputTable.push_back(
 852         IITDescriptor::get(IITDescriptor::VecOfAnyPtrsToElt, ArgNo, RefNo));
 853     return;
 854   }
 855   case IIT_EMPTYSTRUCT:
 856     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
 857     return;
 858   case IIT_STRUCT8: ++StructElts; LLVM_FALLTHROUGH;
 859   case IIT_STRUCT7: ++StructElts; LLVM_FALLTHROUGH;
 860   case IIT_STRUCT6: ++StructElts; LLVM_FALLTHROUGH;
 861   case IIT_STRUCT5: ++StructElts; LLVM_FALLTHROUGH;
 862   case IIT_STRUCT4: ++StructElts; LLVM_FALLTHROUGH;
 863   case IIT_STRUCT3: ++StructElts; LLVM_FALLTHROUGH;
 864   case IIT_STRUCT2: {
 865     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
 866
 867     for (unsigned i = 0; i != StructElts; ++i)
 868       DecodeIITType(NextElt, Infos, OutputTable);
 869     return;
 870   }
 871   case IIT_VEC_ELEMENT: {
 872     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 873     OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecElementArgument,
 874                                              ArgInfo));
 875     return;
 876   }
 877   case IIT_SCALABLE_VEC: {
 878     OutputTable.push_back(IITDescriptor::get(IITDescriptor::ScalableVecArgument,
 879                                              0));
 880     DecodeIITType(NextElt, Infos, OutputTable);
 881     return;
 882   }
 883   }
 884   llvm_unreachable("unhandled");
 885 }
 886
 887 #define GET_INTRINSIC_GENERATOR_GLOBAL
 888 #include "llvm/IR/IntrinsicImpl.inc"
 889 #undef GET_INTRINSIC_GENERATOR_GLOBAL
 890
 891 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
 892                                              SmallVectorImpl<IITDescriptor> &T){
 893   // Check to see if the intrinsic's type was expressible by the table.
 894   unsigned TableVal = IIT_Table[id-1];
 895
 896   // Decode the TableVal into an array of IITValues.
 897   SmallVector<unsigned char, 8> IITValues;
 898   ArrayRef<unsigned char> IITEntries;
 899   unsigned NextElt = 0;
 900   if ((TableVal >> 31) != 0) {
 901     // This is an offset into the IIT_LongEncodingTable.
 902     IITEntries = IIT_LongEncodingTable;
 903
 904     // Strip sentinel bit.
 905     NextElt = (TableVal << 1) >> 1;
 906   } else {
 907     // Decode the TableVal into an array of IITValues.  If the entry was encoded
 908     // into a single word in the table itself, decode it now.
 909     do {
 910       IITValues.push_back(TableVal & 0xF);
 911       TableVal >>= 4;
 912     } while (TableVal);
 913
 914     IITEntries = IITValues;
 915     NextElt = 0;
 916   }
 917
 918   // Okay, decode the table into the output vector of IITDescriptors.
 919   DecodeIITType(NextElt, IITEntries, T);
 920   while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
 921     DecodeIITType(NextElt, IITEntries, T);
 922 }
 923
 924 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
 925                              ArrayRef<Type*> Tys, LLVMContext &Context) {
 926   using namespace Intrinsic;
 927
 928   IITDescriptor D = Infos.front();
 929   Infos = Infos.slice(1);
 930
 931   switch (D.Kind) {
 932   case IITDescriptor::Void: return Type::getVoidTy(Context);
 933   case IITDescriptor::VarArg: return Type::getVoidTy(Context);
 934   case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
 935   case IITDescriptor::Token: return Type::getTokenTy(Context);
 936   case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
 937   case IITDescriptor::Half: return Type::getHalfTy(Context);
 938   case IITDescriptor::Float: return Type::getFloatTy(Context);
 939   case IITDescriptor::Double: return Type::getDoubleTy(Context);
 940   case IITDescriptor::Quad: return Type::getFP128Ty(Context);
 941
 942   case IITDescriptor::Integer:
 943     return IntegerType::get(Context, D.Integer_Width);
 944   case IITDescriptor::Vector:
 945     return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
 946   case IITDescriptor::Pointer:
 947     return PointerType::get(DecodeFixedType(Infos, Tys, Context),
 948                             D.Pointer_AddressSpace);
 949   case IITDescriptor::Struct: {
 950     SmallVector<Type *, 8> Elts;
 951     for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
 952       Elts.push_back(DecodeFixedType(Infos, Tys, Context));
 953     return StructType::get(Context, Elts);
 954   }
 955   case IITDescriptor::Argument:
 956     return Tys[D.getArgumentNumber()];
 957   case IITDescriptor::ExtendArgument: {
 958     Type *Ty = Tys[D.getArgumentNumber()];
 959     if (VectorType *VTy = dyn_cast<VectorType>(Ty))
 960       return VectorType::getExtendedElementVectorType(VTy);
 961
 962     return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
 963   }
 964   case IITDescriptor::TruncArgument: {
 965     Type *Ty = Tys[D.getArgumentNumber()];
 966     if (VectorType *VTy = dyn_cast<VectorType>(Ty))
 967       return VectorType::getTruncatedElementVectorType(VTy);
 968
 969     IntegerType *ITy = cast<IntegerType>(Ty);
 970     assert(ITy->getBitWidth() % 2 == 0);
 971     return IntegerType::get(Context, ITy->getBitWidth() / 2);
 972   }
 973   case IITDescriptor::HalfVecArgument:
 974     return VectorType::getHalfElementsVectorType(cast<VectorType>(
 975                                                   Tys[D.getArgumentNumber()]));
 976   case IITDescriptor::SameVecWidthArgument: {
 977     Type *EltTy = DecodeFixedType(Infos, Tys, Context);
 978     Type *Ty = Tys[D.getArgumentNumber()];
 979     if (auto *VTy = dyn_cast<VectorType>(Ty))
 980       return VectorType::get(EltTy, VTy->getElementCount());
 981     return EltTy;
 982   }
 983   case IITDescriptor::PtrToArgument: {
 984     Type *Ty = Tys[D.getArgumentNumber()];
 985     return PointerType::getUnqual(Ty);
 986   }
 987   case IITDescriptor::PtrToElt: {
 988     Type *Ty = Tys[D.getArgumentNumber()];
 989     VectorType *VTy = dyn_cast<VectorType>(Ty);
 990     if (!VTy)
 991       llvm_unreachable("Expected an argument of Vector Type");
 992     Type *EltTy = VTy->getVectorElementType();
 993     return PointerType::getUnqual(EltTy);
 994   }
 995   case IITDescriptor::VecElementArgument: {
 996     Type *Ty = Tys[D.getArgumentNumber()];
 997     if (VectorType *VTy = dyn_cast<VectorType>(Ty))
 998       return VTy->getElementType();
 999     llvm_unreachable("Expected an argument of Vector Type");
1000   }
1001   case IITDescriptor::VecOfAnyPtrsToElt:
1002     // Return the overloaded type (which determines the pointers address space)
1003     return Tys[D.getOverloadArgNumber()];
1004   case IITDescriptor::ScalableVecArgument: {
1005     Type *Ty = DecodeFixedType(Infos, Tys, Context);
1006     return VectorType::get(Ty->getVectorElementType(),
1007                            { Ty->getVectorNumElements(), true });
1008   }
1009   }
1010   llvm_unreachable("unhandled");
1011 }
1012
1013 FunctionType *Intrinsic::getType(LLVMContext &Context,
1014                                  ID id, ArrayRef<Type*> Tys) {
1015   SmallVector<IITDescriptor, 8> Table;
1016   getIntrinsicInfoTableEntries(id, Table);
1017
1018   ArrayRef<IITDescriptor> TableRef = Table;
1019   Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
1020
1021   SmallVector<Type*, 8> ArgTys;
1022   while (!TableRef.empty())
1023     ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
1024
1025   // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
1026   // If we see void type as the type of the last argument, it is vararg intrinsic
1027   if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
1028     ArgTys.pop_back();
1029     return FunctionType::get(ResultTy, ArgTys, true);
1030   }
1031   return FunctionType::get(ResultTy, ArgTys, false);
1032 }
1033
1034 bool Intrinsic::isOverloaded(ID id) {
1035 #define GET_INTRINSIC_OVERLOAD_TABLE
1036 #include "llvm/IR/IntrinsicImpl.inc"
1037 #undef GET_INTRINSIC_OVERLOAD_TABLE
1038 }
1039
1040 bool Intrinsic::isLeaf(ID id) {
1041   switch (id) {
1042   default:
1043     return true;
1044
1045   case Intrinsic::experimental_gc_statepoint:
1046   case Intrinsic::experimental_patchpoint_void:
1047   case Intrinsic::experimental_patchpoint_i64:
1048     return false;
1049   }
1050 }
1051
1052 /// This defines the "Intrinsic::getAttributes(ID id)" method.
1053 #define GET_INTRINSIC_ATTRIBUTES
1054 #include "llvm/IR/IntrinsicImpl.inc"
1055 #undef GET_INTRINSIC_ATTRIBUTES
1056
1057 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
1058   // There can never be multiple globals with the same name of different types,
1059   // because intrinsics must be a specific type.
1060   return cast<Function>(
1061       M->getOrInsertFunction(getName(id, Tys),
1062                              getType(M->getContext(), id, Tys))
1063           .getCallee());
1064 }
1065
1066 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
1067 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
1068 #include "llvm/IR/IntrinsicImpl.inc"
1069 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
1070
1071 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
1072 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
1073 #include "llvm/IR/IntrinsicImpl.inc"
1074 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
1075
1076 using DeferredIntrinsicMatchPair =
1077     std::pair<Type *, ArrayRef<Intrinsic::IITDescriptor>>;
1078
1079 static bool matchIntrinsicType(
1080     Type *Ty, ArrayRef<Intrinsic::IITDescriptor> &Infos,
1081     SmallVectorImpl<Type *> &ArgTys,
1082     SmallVectorImpl<DeferredIntrinsicMatchPair> &DeferredChecks,
1083     bool IsDeferredCheck) {
1084   using namespace Intrinsic;
1085
1086   // If we ran out of descriptors, there are too many arguments.
1087   if (Infos.empty()) return true;
1088
1089   // Do this before slicing off the 'front' part
1090   auto InfosRef = Infos;
1091   auto DeferCheck = [&DeferredChecks, &InfosRef](Type *T) {
1092     DeferredChecks.emplace_back(T, InfosRef);
1093     return false;
1094   };
1095
1096   IITDescriptor D = Infos.front();
1097   Infos = Infos.slice(1);
1098
1099   switch (D.Kind) {
1100     case IITDescriptor::Void: return !Ty->isVoidTy();
1101     case IITDescriptor::VarArg: return true;
1102     case IITDescriptor::MMX:  return !Ty->isX86_MMXTy();
1103     case IITDescriptor::Token: return !Ty->isTokenTy();
1104     case IITDescriptor::Metadata: return !Ty->isMetadataTy();
1105     case IITDescriptor::Half: return !Ty->isHalfTy();
1106     case IITDescriptor::Float: return !Ty->isFloatTy();
1107     case IITDescriptor::Double: return !Ty->isDoubleTy();
1108     case IITDescriptor::Quad: return !Ty->isFP128Ty();
1109     case IITDescriptor::Integer: return !Ty->isIntegerTy(D.Integer_Width);
1110     case IITDescriptor::Vector: {
1111       VectorType *VT = dyn_cast<VectorType>(Ty);
1112       return !VT || VT->getNumElements() != D.Vector_Width ||
1113              matchIntrinsicType(VT->getElementType(), Infos, ArgTys,
1114                                 DeferredChecks, IsDeferredCheck);
1115     }
1116     case IITDescriptor::Pointer: {
1117       PointerType *PT = dyn_cast<PointerType>(Ty);
1118       return !PT || PT->getAddressSpace() != D.Pointer_AddressSpace ||
1119              matchIntrinsicType(PT->getElementType(), Infos, ArgTys,
1120                                 DeferredChecks, IsDeferredCheck);
1121     }
1122
1123     case IITDescriptor::Struct: {
1124       StructType *ST = dyn_cast<StructType>(Ty);
1125       if (!ST || ST->getNumElements() != D.Struct_NumElements)
1126         return true;
1127
1128       for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
1129         if (matchIntrinsicType(ST->getElementType(i), Infos, ArgTys,
1130                                DeferredChecks, IsDeferredCheck))
1131           return true;
1132       return false;
1133     }
1134
1135     case IITDescriptor::Argument:
1136       // If this is the second occurrence of an argument,
1137       // verify that the later instance matches the previous instance.
1138       if (D.getArgumentNumber() < ArgTys.size())
1139         return Ty != ArgTys[D.getArgumentNumber()];
1140
1141       if (D.getArgumentNumber() > ArgTys.size() ||
1142           D.getArgumentKind() == IITDescriptor::AK_MatchType)
1143         return IsDeferredCheck || DeferCheck(Ty);
1144
1145       assert(D.getArgumentNumber() == ArgTys.size() && !IsDeferredCheck &&
1146              "Table consistency error");
1147       ArgTys.push_back(Ty);
1148
1149       switch (D.getArgumentKind()) {
1150         case IITDescriptor::AK_Any:        return false; // Success
1151         case IITDescriptor::AK_AnyInteger: return !Ty->isIntOrIntVectorTy();
1152         case IITDescriptor::AK_AnyFloat:   return !Ty->isFPOrFPVectorTy();
1153         case IITDescriptor::AK_AnyVector:  return !isa<VectorType>(Ty);
1154         case IITDescriptor::AK_AnyPointer: return !isa<PointerType>(Ty);
1155         default:                           break;
1156       }
1157       llvm_unreachable("all argument kinds not covered");
1158
1159     case IITDescriptor::ExtendArgument: {
1160       // If this is a forward reference, defer the check for later.
1161       if (D.getArgumentNumber() >= ArgTys.size())
1162         return IsDeferredCheck || DeferCheck(Ty);
1163
1164       Type *NewTy = ArgTys[D.getArgumentNumber()];
1165       if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1166         NewTy = VectorType::getExtendedElementVectorType(VTy);
1167       else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1168         NewTy = IntegerType::get(ITy->getContext(), 2 * ITy->getBitWidth());
1169       else
1170         return true;
1171
1172       return Ty != NewTy;
1173     }
1174     case IITDescriptor::TruncArgument: {
1175       // If this is a forward reference, defer the check for later.
1176       if (D.getArgumentNumber() >= ArgTys.size())
1177         return IsDeferredCheck || DeferCheck(Ty);
1178
1179       Type *NewTy = ArgTys[D.getArgumentNumber()];
1180       if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1181         NewTy = VectorType::getTruncatedElementVectorType(VTy);
1182       else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1183         NewTy = IntegerType::get(ITy->getContext(), ITy->getBitWidth() / 2);
1184       else
1185         return true;
1186
1187       return Ty != NewTy;
1188     }
1189     case IITDescriptor::HalfVecArgument:
1190       // If this is a forward reference, defer the check for later.
1191       return D.getArgumentNumber() >= ArgTys.size() ||
1192              !isa<VectorType>(ArgTys[D.getArgumentNumber()]) ||
1193              VectorType::getHalfElementsVectorType(
1194                      cast<VectorType>(ArgTys[D.getArgumentNumber()])) != Ty;
1195     case IITDescriptor::SameVecWidthArgument: {
1196       if (D.getArgumentNumber() >= ArgTys.size()) {
1197         // Defer check and subsequent check for the vector element type.
1198         Infos = Infos.slice(1);
1199         return IsDeferredCheck || DeferCheck(Ty);
1200       }
1201       auto *ReferenceType = dyn_cast<VectorType>(ArgTys[D.getArgumentNumber()]);
1202       auto *ThisArgType = dyn_cast<VectorType>(Ty);
1203       // Both must be vectors of the same number of elements or neither.
1204       if ((ReferenceType != nullptr) != (ThisArgType != nullptr))
1205         return true;
1206       Type *EltTy = Ty;
1207       if (ThisArgType) {
1208         if (ReferenceType->getElementCount() !=
1209             ThisArgType->getElementCount())
1210           return true;
1211         EltTy = ThisArgType->getVectorElementType();
1212       }
1213       return matchIntrinsicType(EltTy, Infos, ArgTys, DeferredChecks,
1214                                 IsDeferredCheck);
1215     }
1216     case IITDescriptor::PtrToArgument: {
1217       if (D.getArgumentNumber() >= ArgTys.size())
1218         return IsDeferredCheck || DeferCheck(Ty);
1219       Type * ReferenceType = ArgTys[D.getArgumentNumber()];
1220       PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1221       return (!ThisArgType || ThisArgType->getElementType() != ReferenceType);
1222     }
1223     case IITDescriptor::PtrToElt: {
1224       if (D.getArgumentNumber() >= ArgTys.size())
1225         return IsDeferredCheck || DeferCheck(Ty);
1226       VectorType * ReferenceType =
1227         dyn_cast<VectorType> (ArgTys[D.getArgumentNumber()]);
1228       PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1229
1230       return (!ThisArgType || !ReferenceType ||
1231               ThisArgType->getElementType() != ReferenceType->getElementType());
1232     }
1233     case IITDescriptor::VecOfAnyPtrsToElt: {
1234       unsigned RefArgNumber = D.getRefArgNumber();
1235       if (RefArgNumber >= ArgTys.size()) {
1236         if (IsDeferredCheck)
1237           return true;
1238         // If forward referencing, already add the pointer-vector type and
1239         // defer the checks for later.
1240         ArgTys.push_back(Ty);
1241         return DeferCheck(Ty);
1242       }
1243
1244       if (!IsDeferredCheck){
1245         assert(D.getOverloadArgNumber() == ArgTys.size() &&
1246                "Table consistency error");
1247         ArgTys.push_back(Ty);
1248       }
1249
1250       // Verify the overloaded type "matches" the Ref type.
1251       // i.e. Ty is a vector with the same width as Ref.
1252       // Composed of pointers to the same element type as Ref.
1253       VectorType *ReferenceType = dyn_cast<VectorType>(ArgTys[RefArgNumber]);
1254       VectorType *ThisArgVecTy = dyn_cast<VectorType>(Ty);
1255       if (!ThisArgVecTy || !ReferenceType ||
1256           (ReferenceType->getVectorNumElements() !=
1257            ThisArgVecTy->getVectorNumElements()))
1258         return true;
1259       PointerType *ThisArgEltTy =
1260               dyn_cast<PointerType>(ThisArgVecTy->getVectorElementType());
1261       if (!ThisArgEltTy)
1262         return true;
1263       return ThisArgEltTy->getElementType() !=
1264              ReferenceType->getVectorElementType();
1265     }
1266     case IITDescriptor::VecElementArgument: {
1267       if (D.getArgumentNumber() >= ArgTys.size())
1268         return IsDeferredCheck ? true : DeferCheck(Ty);
1269       auto *ReferenceType = dyn_cast<VectorType>(ArgTys[D.getArgumentNumber()]);
1270       return !ReferenceType || Ty != ReferenceType->getElementType();
1271     }
1272     case IITDescriptor::ScalableVecArgument: {
1273       VectorType *VTy = dyn_cast<VectorType>(Ty);
1274       if (!VTy || !VTy->isScalable())
1275         return true;
1276       return matchIntrinsicType(VTy, Infos, ArgTys, DeferredChecks,
1277                                 IsDeferredCheck);
1278     }
1279   }
1280   llvm_unreachable("unhandled");
1281 }
1282
1283 Intrinsic::MatchIntrinsicTypesResult
1284 Intrinsic::matchIntrinsicSignature(FunctionType *FTy,
1285                                    ArrayRef<Intrinsic::IITDescriptor> &Infos,
1286                                    SmallVectorImpl<Type *> &ArgTys) {
1287   SmallVector<DeferredIntrinsicMatchPair, 2> DeferredChecks;
1288   if (matchIntrinsicType(FTy->getReturnType(), Infos, ArgTys, DeferredChecks,
1289                          false))
1290     return MatchIntrinsicTypes_NoMatchRet;
1291
1292   unsigned NumDeferredReturnChecks = DeferredChecks.size();
1293
1294   for (auto Ty : FTy->params())
1295     if (matchIntrinsicType(Ty, Infos, ArgTys, DeferredChecks, false))
1296       return MatchIntrinsicTypes_NoMatchArg;
1297
1298   for (unsigned I = 0, E = DeferredChecks.size(); I != E; ++I) {
1299     DeferredIntrinsicMatchPair &Check = DeferredChecks[I];
1300     if (matchIntrinsicType(Check.first, Check.second, ArgTys, DeferredChecks,
1301                            true))
1302       return I < NumDeferredReturnChecks ? MatchIntrinsicTypes_NoMatchRet
1303                                          : MatchIntrinsicTypes_NoMatchArg;
1304   }
1305
1306   return MatchIntrinsicTypes_Match;
1307 }
1308
1309 bool
1310 Intrinsic::matchIntrinsicVarArg(bool isVarArg,
1311                                 ArrayRef<Intrinsic::IITDescriptor> &Infos) {
1312   // If there are no descriptors left, then it can't be a vararg.
1313   if (Infos.empty())
1314     return isVarArg;
1315
1316   // There should be only one descriptor remaining at this point.
1317   if (Infos.size() != 1)
1318     return true;
1319
1320   // Check and verify the descriptor.
1321   IITDescriptor D = Infos.front();
1322   Infos = Infos.slice(1);
1323   if (D.Kind == IITDescriptor::VarArg)
1324     return !isVarArg;
1325
1326   return true;
1327 }
1328
1329 Optional<Function*> Intrinsic::remangleIntrinsicFunction(Function *F) {
1330   Intrinsic::ID ID = F->getIntrinsicID();
1331   if (!ID)
1332     return None;
1333
1334   FunctionType *FTy = F->getFunctionType();
1335   // Accumulate an array of overloaded types for the given intrinsic
1336   SmallVector<Type *, 4> ArgTys;
1337   {
1338     SmallVector<Intrinsic::IITDescriptor, 8> Table;
1339     getIntrinsicInfoTableEntries(ID, Table);
1340     ArrayRef<Intrinsic::IITDescriptor> TableRef = Table;
1341
1342     if (Intrinsic::matchIntrinsicSignature(FTy, TableRef, ArgTys))
1343       return None;
1344     if (Intrinsic::matchIntrinsicVarArg(FTy->isVarArg(), TableRef))
1345       return None;
1346   }
1347
1348   StringRef Name = F->getName();
1349   if (Name == Intrinsic::getName(ID, ArgTys))
1350     return None;
1351
1352   auto NewDecl = Intrinsic::getDeclaration(F->getParent(), ID, ArgTys);
1353   NewDecl->setCallingConv(F->getCallingConv());
1354   assert(NewDecl->getFunctionType() == FTy && "Shouldn't change the signature");
1355   return NewDecl;
1356 }
1357
1358 /// hasAddressTaken - returns true if there are any uses of this function
1359 /// other than direct calls or invokes to it.
1360 bool Function::hasAddressTaken(const User* *PutOffender) const {
1361   for (const Use &U : uses()) {
1362     const User *FU = U.getUser();
1363     if (isa<BlockAddress>(FU))
1364       continue;
1365     const auto *Call = dyn_cast<CallBase>(FU);
1366     if (!Call) {
1367       if (PutOffender)
1368         *PutOffender = FU;
1369       return true;
1370     }
1371     if (!Call->isCallee(&U)) {
1372       if (PutOffender)
1373         *PutOffender = FU;
1374       return true;
1375     }
1376   }
1377   return false;
1378 }
1379
1380 bool Function::isDefTriviallyDead() const {
1381   // Check the linkage
1382   if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
1383       !hasAvailableExternallyLinkage())
1384     return false;
1385
1386   // Check if the function is used by anything other than a blockaddress.
1387   for (const User *U : users())
1388     if (!isa<BlockAddress>(U))
1389       return false;
1390
1391   return true;
1392 }
1393
1394 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
1395 /// setjmp or other function that gcc recognizes as "returning twice".
1396 bool Function::callsFunctionThatReturnsTwice() const {
1397   for (const Instruction &I : instructions(this))
1398     if (const auto *Call = dyn_cast<CallBase>(&I))
1399       if (Call->hasFnAttr(Attribute::ReturnsTwice))
1400         return true;
1401
1402   return false;
1403 }
1404
1405 Constant *Function::getPersonalityFn() const {
1406   assert(hasPersonalityFn() && getNumOperands());
1407   return cast<Constant>(Op<0>());
1408 }
1409
1410 void Function::setPersonalityFn(Constant *Fn) {
1411   setHungoffOperand<0>(Fn);
1412   setValueSubclassDataBit(3, Fn != nullptr);
1413 }
1414
1415 Constant *Function::getPrefixData() const {
1416   assert(hasPrefixData() && getNumOperands());
1417   return cast<Constant>(Op<1>());
1418 }
1419
1420 void Function::setPrefixData(Constant *PrefixData) {
1421   setHungoffOperand<1>(PrefixData);
1422   setValueSubclassDataBit(1, PrefixData != nullptr);
1423 }
1424
1425 Constant *Function::getPrologueData() const {
1426   assert(hasPrologueData() && getNumOperands());
1427   return cast<Constant>(Op<2>());
1428 }
1429
1430 void Function::setPrologueData(Constant *PrologueData) {
1431   setHungoffOperand<2>(PrologueData);
1432   setValueSubclassDataBit(2, PrologueData != nullptr);
1433 }
1434
1435 void Function::allocHungoffUselist() {
1436   // If we've already allocated a uselist, stop here.
1437   if (getNumOperands())
1438     return;
1439
1440   allocHungoffUses(3, /*IsPhi=*/ false);
1441   setNumHungOffUseOperands(3);
1442
1443   // Initialize the uselist with placeholder operands to allow traversal.
1444   auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
1445   Op<0>().set(CPN);
1446   Op<1>().set(CPN);
1447   Op<2>().set(CPN);
1448 }
1449
1450 template <int Idx>
1451 void Function::setHungoffOperand(Constant *C) {
1452   if (C) {
1453     allocHungoffUselist();
1454     Op<Idx>().set(C);
1455   } else if (getNumOperands()) {
1456     Op<Idx>().set(
1457         ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0)));
1458   }
1459 }
1460
1461 void Function::setValueSubclassDataBit(unsigned Bit, bool On) {
1462   assert(Bit < 16 && "SubclassData contains only 16 bits");
1463   if (On)
1464     setValueSubclassData(getSubclassDataFromValue() | (1 << Bit));
1465   else
1466     setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit));
1467 }
1468
1469 void Function::setEntryCount(ProfileCount Count,
1470                              const DenseSet<GlobalValue::GUID> *S) {
1471   assert(Count.hasValue());
1472 #if !defined(NDEBUG)
1473   auto PrevCount = getEntryCount();
1474   assert(!PrevCount.hasValue() || PrevCount.getType() == Count.getType());
1475 #endif
1476   MDBuilder MDB(getContext());
1477   setMetadata(
1478       LLVMContext::MD_prof,
1479       MDB.createFunctionEntryCount(Count.getCount(), Count.isSynthetic(), S));
1480 }
1481
1482 void Function::setEntryCount(uint64_t Count, Function::ProfileCountType Type,
1483                              const DenseSet<GlobalValue::GUID> *Imports) {
1484   setEntryCount(ProfileCount(Count, Type), Imports);
1485 }
1486
1487 ProfileCount Function::getEntryCount(bool AllowSynthetic) const {
1488   MDNode *MD = getMetadata(LLVMContext::MD_prof);
1489   if (MD && MD->getOperand(0))
1490     if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0))) {
1491       if (MDS->getString().equals("function_entry_count")) {
1492         ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1493         uint64_t Count = CI->getValue().getZExtValue();
1494         // A value of -1 is used for SamplePGO when there were no samples.
1495         // Treat this the same as unknown.
1496         if (Count == (uint64_t)-1)
1497           return ProfileCount::getInvalid();
1498         return ProfileCount(Count, PCT_Real);
1499       } else if (AllowSynthetic &&
1500                  MDS->getString().equals("synthetic_function_entry_count")) {
1501         ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1502         uint64_t Count = CI->getValue().getZExtValue();
1503         return ProfileCount(Count, PCT_Synthetic);
1504       }
1505     }
1506   return ProfileCount::getInvalid();
1507 }
1508
1509 DenseSet<GlobalValue::GUID> Function::getImportGUIDs() const {
1510   DenseSet<GlobalValue::GUID> R;
1511   if (MDNode *MD = getMetadata(LLVMContext::MD_prof))
1512     if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1513       if (MDS->getString().equals("function_entry_count"))
1514         for (unsigned i = 2; i < MD->getNumOperands(); i++)
1515           R.insert(mdconst::extract<ConstantInt>(MD->getOperand(i))
1516                        ->getValue()
1517                        .getZExtValue());
1518   return R;
1519 }
1520
1521 void Function::setSectionPrefix(StringRef Prefix) {
1522   MDBuilder MDB(getContext());
1523   setMetadata(LLVMContext::MD_section_prefix,
1524               MDB.createFunctionSectionPrefix(Prefix));
1525 }
1526
1527 Optional<StringRef> Function::getSectionPrefix() const {
1528   if (MDNode *MD = getMetadata(LLVMContext::MD_section_prefix)) {
1529     assert(cast<MDString>(MD->getOperand(0))
1530                ->getString()
1531                .equals("function_section_prefix") &&
1532            "Metadata not match");
1533     return cast<MDString>(MD->getOperand(1))->getString();
1534   }
1535   return None;
1536 }
1537
1538 bool Function::nullPointerIsDefined() const {
1539   return getFnAttribute("null-pointer-is-valid")
1540           .getValueAsString()
1541           .equals("true");
1542 }
1543
1544 bool llvm::NullPointerIsDefined(const Function *F, unsigned AS) {
1545   if (F && F->nullPointerIsDefined())
1546     return true;
1547
1548   if (AS != 0)
1549     return true;
1550
1551   return false;
1552 }