lib/IR/Function.cpp

   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/DenseMap.h"
  18 #include "llvm/ADT/STLExtras.h"
  19 #include "llvm/ADT/StringExtras.h"
  20 #include "llvm/CodeGen/ValueTypes.h"
  21 #include "llvm/IR/CallSite.h"
  22 #include "llvm/IR/Constants.h"
  23 #include "llvm/IR/DerivedTypes.h"
  24 #include "llvm/IR/InstIterator.h"
  25 #include "llvm/IR/IntrinsicInst.h"
  26 #include "llvm/IR/LLVMContext.h"
  27 #include "llvm/IR/MDBuilder.h"
  28 #include "llvm/IR/Metadata.h"
  29 #include "llvm/IR/Module.h"
  30 #include "llvm/Support/ManagedStatic.h"
  31 #include "llvm/Support/RWMutex.h"
  32 #include "llvm/Support/StringPool.h"
  33 #include "llvm/Support/Threading.h"
  34 using namespace llvm;
  35
  36 // Explicit instantiations of SymbolTableListTraits since some of the methods
  37 // are not in the public header file...
  38 template class llvm::SymbolTableListTraits<Argument>;
  39 template class llvm::SymbolTableListTraits<BasicBlock>;
  40
  41 //===----------------------------------------------------------------------===//
  42 // Argument Implementation
  43 //===----------------------------------------------------------------------===//
  44
  45 void Argument::anchor() { }
  46
  47 Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
  48   : Value(Ty, Value::ArgumentVal) {
  49   Parent = nullptr;
  50
  51   if (Par)
  52     Par->getArgumentList().push_back(this);
  53   setName(Name);
  54 }
  55
  56 void Argument::setParent(Function *parent) {
  57   Parent = parent;
  58 }
  59
  60 /// getArgNo - Return the index of this formal argument in its containing
  61 /// function.  For example in "void foo(int a, float b)" a is 0 and b is 1.
  62 unsigned Argument::getArgNo() const {
  63   const Function *F = getParent();
  64   assert(F && "Argument is not in a function");
  65
  66   Function::const_arg_iterator AI = F->arg_begin();
  67   unsigned ArgIdx = 0;
  68   for (; &*AI != this; ++AI)
  69     ++ArgIdx;
  70
  71   return ArgIdx;
  72 }
  73
  74 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on
  75 /// it in its containing function. Also returns true if at least one byte is
  76 /// known to be dereferenceable and the pointer is in addrspace(0).
  77 bool Argument::hasNonNullAttr() const {
  78   if (!getType()->isPointerTy()) return false;
  79   if (getParent()->getAttributes().
  80         hasAttribute(getArgNo()+1, Attribute::NonNull))
  81     return true;
  82   else if (getDereferenceableBytes() > 0 &&
  83            getType()->getPointerAddressSpace() == 0)
  84     return true;
  85   return false;
  86 }
  87
  88 /// hasByValAttr - Return true if this argument has the byval attribute on it
  89 /// in its containing function.
  90 bool Argument::hasByValAttr() const {
  91   if (!getType()->isPointerTy()) return false;
  92   return getParent()->getAttributes().
  93     hasAttribute(getArgNo()+1, Attribute::ByVal);
  94 }
  95
  96 /// \brief Return true if this argument has the inalloca attribute on it in
  97 /// its containing function.
  98 bool Argument::hasInAllocaAttr() const {
  99   if (!getType()->isPointerTy()) return false;
 100   return getParent()->getAttributes().
 101     hasAttribute(getArgNo()+1, Attribute::InAlloca);
 102 }
 103
 104 bool Argument::hasByValOrInAllocaAttr() const {
 105   if (!getType()->isPointerTy()) return false;
 106   AttributeSet Attrs = getParent()->getAttributes();
 107   return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) ||
 108          Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca);
 109 }
 110
 111 unsigned Argument::getParamAlignment() const {
 112   assert(getType()->isPointerTy() && "Only pointers have alignments");
 113   return getParent()->getParamAlignment(getArgNo()+1);
 114
 115 }
 116
 117 uint64_t Argument::getDereferenceableBytes() const {
 118   assert(getType()->isPointerTy() &&
 119          "Only pointers have dereferenceable bytes");
 120   return getParent()->getDereferenceableBytes(getArgNo()+1);
 121 }
 122
 123 uint64_t Argument::getDereferenceableOrNullBytes() const {
 124   assert(getType()->isPointerTy() &&
 125          "Only pointers have dereferenceable bytes");
 126   return getParent()->getDereferenceableOrNullBytes(getArgNo()+1);
 127 }
 128
 129 /// hasNestAttr - Return true if this argument has the nest attribute on
 130 /// it in its containing function.
 131 bool Argument::hasNestAttr() const {
 132   if (!getType()->isPointerTy()) return false;
 133   return getParent()->getAttributes().
 134     hasAttribute(getArgNo()+1, Attribute::Nest);
 135 }
 136
 137 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
 138 /// it in its containing function.
 139 bool Argument::hasNoAliasAttr() const {
 140   if (!getType()->isPointerTy()) return false;
 141   return getParent()->getAttributes().
 142     hasAttribute(getArgNo()+1, Attribute::NoAlias);
 143 }
 144
 145 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
 146 /// on it in its containing function.
 147 bool Argument::hasNoCaptureAttr() const {
 148   if (!getType()->isPointerTy()) return false;
 149   return getParent()->getAttributes().
 150     hasAttribute(getArgNo()+1, Attribute::NoCapture);
 151 }
 152
 153 /// hasSRetAttr - Return true if this argument has the sret attribute on
 154 /// it in its containing function.
 155 bool Argument::hasStructRetAttr() const {
 156   if (!getType()->isPointerTy()) return false;
 157   return getParent()->getAttributes().
 158     hasAttribute(getArgNo()+1, Attribute::StructRet);
 159 }
 160
 161 /// hasReturnedAttr - Return true if this argument has the returned attribute on
 162 /// it in its containing function.
 163 bool Argument::hasReturnedAttr() const {
 164   return getParent()->getAttributes().
 165     hasAttribute(getArgNo()+1, Attribute::Returned);
 166 }
 167
 168 /// hasZExtAttr - Return true if this argument has the zext attribute on it in
 169 /// its containing function.
 170 bool Argument::hasZExtAttr() const {
 171   return getParent()->getAttributes().
 172     hasAttribute(getArgNo()+1, Attribute::ZExt);
 173 }
 174
 175 /// hasSExtAttr Return true if this argument has the sext attribute on it in its
 176 /// containing function.
 177 bool Argument::hasSExtAttr() const {
 178   return getParent()->getAttributes().
 179     hasAttribute(getArgNo()+1, 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 //===----------------------------------------------------------------------===//
 212 // Helper Methods in Function
 213 //===----------------------------------------------------------------------===//
 214
 215 bool Function::isMaterializable() const {
 216   return getGlobalObjectSubClassData() & IsMaterializableBit;
 217 }
 218
 219 void Function::setIsMaterializable(bool V) {
 220   setGlobalObjectBit(IsMaterializableBit, V);
 221 }
 222
 223 LLVMContext &Function::getContext() const {
 224   return getType()->getContext();
 225 }
 226
 227 FunctionType *Function::getFunctionType() const { return Ty; }
 228
 229 bool Function::isVarArg() const {
 230   return getFunctionType()->isVarArg();
 231 }
 232
 233 Type *Function::getReturnType() const {
 234   return getFunctionType()->getReturnType();
 235 }
 236
 237 void Function::removeFromParent() {
 238   getParent()->getFunctionList().remove(getIterator());
 239 }
 240
 241 void Function::eraseFromParent() {
 242   getParent()->getFunctionList().erase(getIterator());
 243 }
 244
 245 //===----------------------------------------------------------------------===//
 246 // Function Implementation
 247 //===----------------------------------------------------------------------===//
 248
 249 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
 250                    Module *ParentModule)
 251     : GlobalObject(Ty, Value::FunctionVal,
 252                    OperandTraits<Function>::op_begin(this), 0, Linkage, name),
 253       Ty(Ty) {
 254   assert(FunctionType::isValidReturnType(getReturnType()) &&
 255          "invalid return type");
 256   setGlobalObjectSubClassData(0);
 257   SymTab = new ValueSymbolTable();
 258
 259   // If the function has arguments, mark them as lazily built.
 260   if (Ty->getNumParams())
 261     setValueSubclassData(1);   // Set the "has lazy arguments" bit.
 262
 263   if (ParentModule)
 264     ParentModule->getFunctionList().push_back(this);
 265
 266   // Ensure intrinsics have the right parameter attributes.
 267   // Note, the IntID field will have been set in Value::setName if this function
 268   // name is a valid intrinsic ID.
 269   if (IntID)
 270     setAttributes(Intrinsic::getAttributes(getContext(), IntID));
 271 }
 272
 273 Function::~Function() {
 274   dropAllReferences();    // After this it is safe to delete instructions.
 275
 276   // Delete all of the method arguments and unlink from symbol table...
 277   ArgumentList.clear();
 278   delete SymTab;
 279
 280   // Remove the function from the on-the-side GC table.
 281   clearGC();
 282
 283   // FIXME: needed by operator delete
 284   setFunctionNumOperands(1);
 285 }
 286
 287 void Function::BuildLazyArguments() const {
 288   // Create the arguments vector, all arguments start out unnamed.
 289   FunctionType *FT = getFunctionType();
 290   for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
 291     assert(!FT->getParamType(i)->isVoidTy() &&
 292            "Cannot have void typed arguments!");
 293     ArgumentList.push_back(new Argument(FT->getParamType(i)));
 294   }
 295
 296   // Clear the lazy arguments bit.
 297   unsigned SDC = getSubclassDataFromValue();
 298   const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
 299 }
 300
 301 size_t Function::arg_size() const {
 302   return getFunctionType()->getNumParams();
 303 }
 304 bool Function::arg_empty() const {
 305   return getFunctionType()->getNumParams() == 0;
 306 }
 307
 308 void Function::setParent(Module *parent) {
 309   Parent = parent;
 310 }
 311
 312 // dropAllReferences() - This function causes all the subinstructions to "let
 313 // go" of all references that they are maintaining.  This allows one to
 314 // 'delete' a whole class at a time, even though there may be circular
 315 // references... first all references are dropped, and all use counts go to
 316 // zero.  Then everything is deleted for real.  Note that no operations are
 317 // valid on an object that has "dropped all references", except operator
 318 // delete.
 319 //
 320 void Function::dropAllReferences() {
 321   setIsMaterializable(false);
 322
 323   for (iterator I = begin(), E = end(); I != E; ++I)
 324     I->dropAllReferences();
 325
 326   // Delete all basic blocks. They are now unused, except possibly by
 327   // blockaddresses, but BasicBlock's destructor takes care of those.
 328   while (!BasicBlocks.empty())
 329     BasicBlocks.begin()->eraseFromParent();
 330
 331   // Prefix and prologue data are stored in a side table.
 332   setPrefixData(nullptr);
 333   setPrologueData(nullptr);
 334
 335   // Metadata is stored in a side-table.
 336   clearMetadata();
 337
 338   setPersonalityFn(nullptr);
 339 }
 340
 341 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
 342   AttributeSet PAL = getAttributes();
 343   PAL = PAL.addAttribute(getContext(), i, attr);
 344   setAttributes(PAL);
 345 }
 346
 347 void Function::addAttributes(unsigned i, AttributeSet attrs) {
 348   AttributeSet PAL = getAttributes();
 349   PAL = PAL.addAttributes(getContext(), i, attrs);
 350   setAttributes(PAL);
 351 }
 352
 353 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
 354   AttributeSet PAL = getAttributes();
 355   PAL = PAL.removeAttributes(getContext(), i, attrs);
 356   setAttributes(PAL);
 357 }
 358
 359 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
 360   AttributeSet PAL = getAttributes();
 361   PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
 362   setAttributes(PAL);
 363 }
 364
 365 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
 366   AttributeSet PAL = getAttributes();
 367   PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
 368   setAttributes(PAL);
 369 }
 370
 371 // Maintain the GC name for each function in an on-the-side table. This saves
 372 // allocating an additional word in Function for programs which do not use GC
 373 // (i.e., most programs) at the cost of increased overhead for clients which do
 374 // use GC.
 375 static DenseMap<const Function*,PooledStringPtr> *GCNames;
 376 static StringPool *GCNamePool;
 377 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
 378
 379 bool Function::hasGC() const {
 380   sys::SmartScopedReader<true> Reader(*GCLock);
 381   return GCNames && GCNames->count(this);
 382 }
 383
 384 const char *Function::getGC() const {
 385   assert(hasGC() && "Function has no collector");
 386   sys::SmartScopedReader<true> Reader(*GCLock);
 387   return *(*GCNames)[this];
 388 }
 389
 390 void Function::setGC(const char *Str) {
 391   sys::SmartScopedWriter<true> Writer(*GCLock);
 392   if (!GCNamePool)
 393     GCNamePool = new StringPool();
 394   if (!GCNames)
 395     GCNames = new DenseMap<const Function*,PooledStringPtr>();
 396   (*GCNames)[this] = GCNamePool->intern(Str);
 397 }
 398
 399 void Function::clearGC() {
 400   sys::SmartScopedWriter<true> Writer(*GCLock);
 401   if (GCNames) {
 402     GCNames->erase(this);
 403     if (GCNames->empty()) {
 404       delete GCNames;
 405       GCNames = nullptr;
 406       if (GCNamePool->empty()) {
 407         delete GCNamePool;
 408         GCNamePool = nullptr;
 409       }
 410     }
 411   }
 412 }
 413
 414 /// copyAttributesFrom - copy all additional attributes (those not needed to
 415 /// create a Function) from the Function Src to this one.
 416 void Function::copyAttributesFrom(const GlobalValue *Src) {
 417   assert(isa<Function>(Src) && "Expected a Function!");
 418   GlobalObject::copyAttributesFrom(Src);
 419   const Function *SrcF = cast<Function>(Src);
 420   setCallingConv(SrcF->getCallingConv());
 421   setAttributes(SrcF->getAttributes());
 422   if (SrcF->hasGC())
 423     setGC(SrcF->getGC());
 424   else
 425     clearGC();
 426   if (SrcF->hasPrefixData())
 427     setPrefixData(SrcF->getPrefixData());
 428   else
 429     setPrefixData(nullptr);
 430   if (SrcF->hasPrologueData())
 431     setPrologueData(SrcF->getPrologueData());
 432   else
 433     setPrologueData(nullptr);
 434   if (SrcF->hasPersonalityFn())
 435     setPersonalityFn(SrcF->getPersonalityFn());
 436   else
 437     setPersonalityFn(nullptr);
 438 }
 439
 440 /// \brief This does the actual lookup of an intrinsic ID which
 441 /// matches the given function name.
 442 static Intrinsic::ID lookupIntrinsicID(const ValueName *ValName) {
 443   unsigned Len = ValName->getKeyLength();
 444   const char *Name = ValName->getKeyData();
 445
 446 #define GET_FUNCTION_RECOGNIZER
 447 #include "llvm/IR/Intrinsics.gen"
 448 #undef GET_FUNCTION_RECOGNIZER
 449
 450   return Intrinsic::not_intrinsic;
 451 }
 452
 453 void Function::recalculateIntrinsicID() {
 454   const ValueName *ValName = this->getValueName();
 455   if (!ValName || !isIntrinsic()) {
 456     IntID = Intrinsic::not_intrinsic;
 457     return;
 458   }
 459   IntID = lookupIntrinsicID(ValName);
 460 }
 461
 462 /// Returns a stable mangling for the type specified for use in the name
 463 /// mangling scheme used by 'any' types in intrinsic signatures.  The mangling
 464 /// of named types is simply their name.  Manglings for unnamed types consist
 465 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
 466 /// combined with the mangling of their component types.  A vararg function
 467 /// type will have a suffix of 'vararg'.  Since function types can contain
 468 /// other function types, we close a function type mangling with suffix 'f'
 469 /// which can't be confused with it's prefix.  This ensures we don't have
 470 /// collisions between two unrelated function types. Otherwise, you might
 471 /// parse ffXX as f(fXX) or f(fX)X.  (X is a placeholder for any other type.)
 472 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
 473 /// cases) fall back to the MVT codepath, where they could be mangled to
 474 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
 475 /// everything.
 476 static std::string getMangledTypeStr(Type* Ty) {
 477   std::string Result;
 478   if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
 479     Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
 480       getMangledTypeStr(PTyp->getElementType());
 481   } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
 482     Result += "a" + llvm::utostr(ATyp->getNumElements()) +
 483       getMangledTypeStr(ATyp->getElementType());
 484   } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
 485     assert(!STyp->isLiteral() && "TODO: implement literal types");
 486     Result += STyp->getName();
 487   } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) {
 488     Result += "f_" + getMangledTypeStr(FT->getReturnType());
 489     for (size_t i = 0; i < FT->getNumParams(); i++)
 490       Result += getMangledTypeStr(FT->getParamType(i));
 491     if (FT->isVarArg())
 492       Result += "vararg";
 493     // Ensure nested function types are distinguishable.
 494     Result += "f";
 495   } else if (Ty)
 496     Result += EVT::getEVT(Ty).getEVTString();
 497   return Result;
 498 }
 499
 500 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
 501   assert(id < num_intrinsics && "Invalid intrinsic ID!");
 502   static const char * const Table[] = {
 503     "not_intrinsic",
 504 #define GET_INTRINSIC_NAME_TABLE
 505 #include "llvm/IR/Intrinsics.gen"
 506 #undef GET_INTRINSIC_NAME_TABLE
 507   };
 508   if (Tys.empty())
 509     return Table[id];
 510   std::string Result(Table[id]);
 511   for (unsigned i = 0; i < Tys.size(); ++i) {
 512     Result += "." + getMangledTypeStr(Tys[i]);
 513   }
 514   return Result;
 515 }
 516
 517
 518 /// IIT_Info - These are enumerators that describe the entries returned by the
 519 /// getIntrinsicInfoTableEntries function.
 520 ///
 521 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
 522 enum IIT_Info {
 523   // Common values should be encoded with 0-15.
 524   IIT_Done = 0,
 525   IIT_I1   = 1,
 526   IIT_I8   = 2,
 527   IIT_I16  = 3,
 528   IIT_I32  = 4,
 529   IIT_I64  = 5,
 530   IIT_F16  = 6,
 531   IIT_F32  = 7,
 532   IIT_F64  = 8,
 533   IIT_V2   = 9,
 534   IIT_V4   = 10,
 535   IIT_V8   = 11,
 536   IIT_V16  = 12,
 537   IIT_V32  = 13,
 538   IIT_PTR  = 14,
 539   IIT_ARG  = 15,
 540
 541   // Values from 16+ are only encodable with the inefficient encoding.
 542   IIT_V64  = 16,
 543   IIT_MMX  = 17,
 544   IIT_TOKEN = 18,
 545   IIT_METADATA = 19,
 546   IIT_EMPTYSTRUCT = 20,
 547   IIT_STRUCT2 = 21,
 548   IIT_STRUCT3 = 22,
 549   IIT_STRUCT4 = 23,
 550   IIT_STRUCT5 = 24,
 551   IIT_EXTEND_ARG = 25,
 552   IIT_TRUNC_ARG = 26,
 553   IIT_ANYPTR = 27,
 554   IIT_V1   = 28,
 555   IIT_VARARG = 29,
 556   IIT_HALF_VEC_ARG = 30,
 557   IIT_SAME_VEC_WIDTH_ARG = 31,
 558   IIT_PTR_TO_ARG = 32,
 559   IIT_VEC_OF_PTRS_TO_ELT = 33,
 560   IIT_I128 = 34
 561 };
 562
 563
 564 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
 565                       SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
 566   IIT_Info Info = IIT_Info(Infos[NextElt++]);
 567   unsigned StructElts = 2;
 568   using namespace Intrinsic;
 569
 570   switch (Info) {
 571   case IIT_Done:
 572     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
 573     return;
 574   case IIT_VARARG:
 575     OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
 576     return;
 577   case IIT_MMX:
 578     OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
 579     return;
 580   case IIT_TOKEN:
 581     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0));
 582     return;
 583   case IIT_METADATA:
 584     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
 585     return;
 586   case IIT_F16:
 587     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
 588     return;
 589   case IIT_F32:
 590     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
 591     return;
 592   case IIT_F64:
 593     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
 594     return;
 595   case IIT_I1:
 596     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
 597     return;
 598   case IIT_I8:
 599     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
 600     return;
 601   case IIT_I16:
 602     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
 603     return;
 604   case IIT_I32:
 605     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
 606     return;
 607   case IIT_I64:
 608     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
 609     return;
 610   case IIT_I128:
 611     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128));
 612     return;
 613   case IIT_V1:
 614     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
 615     DecodeIITType(NextElt, Infos, OutputTable);
 616     return;
 617   case IIT_V2:
 618     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
 619     DecodeIITType(NextElt, Infos, OutputTable);
 620     return;
 621   case IIT_V4:
 622     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
 623     DecodeIITType(NextElt, Infos, OutputTable);
 624     return;
 625   case IIT_V8:
 626     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
 627     DecodeIITType(NextElt, Infos, OutputTable);
 628     return;
 629   case IIT_V16:
 630     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
 631     DecodeIITType(NextElt, Infos, OutputTable);
 632     return;
 633   case IIT_V32:
 634     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
 635     DecodeIITType(NextElt, Infos, OutputTable);
 636     return;
 637   case IIT_V64:
 638     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
 639     DecodeIITType(NextElt, Infos, OutputTable);
 640     return;
 641   case IIT_PTR:
 642     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
 643     DecodeIITType(NextElt, Infos, OutputTable);
 644     return;
 645   case IIT_ANYPTR: {  // [ANYPTR addrspace, subtype]
 646     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
 647                                              Infos[NextElt++]));
 648     DecodeIITType(NextElt, Infos, OutputTable);
 649     return;
 650   }
 651   case IIT_ARG: {
 652     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 653     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
 654     return;
 655   }
 656   case IIT_EXTEND_ARG: {
 657     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 658     OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
 659                                              ArgInfo));
 660     return;
 661   }
 662   case IIT_TRUNC_ARG: {
 663     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 664     OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
 665                                              ArgInfo));
 666     return;
 667   }
 668   case IIT_HALF_VEC_ARG: {
 669     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 670     OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
 671                                              ArgInfo));
 672     return;
 673   }
 674   case IIT_SAME_VEC_WIDTH_ARG: {
 675     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 676     OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
 677                                              ArgInfo));
 678     return;
 679   }
 680   case IIT_PTR_TO_ARG: {
 681     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 682     OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
 683                                              ArgInfo));
 684     return;
 685   }
 686   case IIT_VEC_OF_PTRS_TO_ELT: {
 687     unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
 688     OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
 689                                              ArgInfo));
 690     return;
 691   }
 692   case IIT_EMPTYSTRUCT:
 693     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
 694     return;
 695   case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
 696   case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
 697   case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
 698   case IIT_STRUCT2: {
 699     OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
 700
 701     for (unsigned i = 0; i != StructElts; ++i)
 702       DecodeIITType(NextElt, Infos, OutputTable);
 703     return;
 704   }
 705   }
 706   llvm_unreachable("unhandled");
 707 }
 708
 709
 710 #define GET_INTRINSIC_GENERATOR_GLOBAL
 711 #include "llvm/IR/Intrinsics.gen"
 712 #undef GET_INTRINSIC_GENERATOR_GLOBAL
 713
 714 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
 715                                              SmallVectorImpl<IITDescriptor> &T){
 716   // Check to see if the intrinsic's type was expressible by the table.
 717   unsigned TableVal = IIT_Table[id-1];
 718
 719   // Decode the TableVal into an array of IITValues.
 720   SmallVector<unsigned char, 8> IITValues;
 721   ArrayRef<unsigned char> IITEntries;
 722   unsigned NextElt = 0;
 723   if ((TableVal >> 31) != 0) {
 724     // This is an offset into the IIT_LongEncodingTable.
 725     IITEntries = IIT_LongEncodingTable;
 726
 727     // Strip sentinel bit.
 728     NextElt = (TableVal << 1) >> 1;
 729   } else {
 730     // Decode the TableVal into an array of IITValues.  If the entry was encoded
 731     // into a single word in the table itself, decode it now.
 732     do {
 733       IITValues.push_back(TableVal & 0xF);
 734       TableVal >>= 4;
 735     } while (TableVal);
 736
 737     IITEntries = IITValues;
 738     NextElt = 0;
 739   }
 740
 741   // Okay, decode the table into the output vector of IITDescriptors.
 742   DecodeIITType(NextElt, IITEntries, T);
 743   while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
 744     DecodeIITType(NextElt, IITEntries, T);
 745 }
 746
 747
 748 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
 749                              ArrayRef<Type*> Tys, LLVMContext &Context) {
 750   using namespace Intrinsic;
 751   IITDescriptor D = Infos.front();
 752   Infos = Infos.slice(1);
 753
 754   switch (D.Kind) {
 755   case IITDescriptor::Void: return Type::getVoidTy(Context);
 756   case IITDescriptor::VarArg: return Type::getVoidTy(Context);
 757   case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
 758   case IITDescriptor::Token: return Type::getTokenTy(Context);
 759   case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
 760   case IITDescriptor::Half: return Type::getHalfTy(Context);
 761   case IITDescriptor::Float: return Type::getFloatTy(Context);
 762   case IITDescriptor::Double: return Type::getDoubleTy(Context);
 763
 764   case IITDescriptor::Integer:
 765     return IntegerType::get(Context, D.Integer_Width);
 766   case IITDescriptor::Vector:
 767     return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
 768   case IITDescriptor::Pointer:
 769     return PointerType::get(DecodeFixedType(Infos, Tys, Context),
 770                             D.Pointer_AddressSpace);
 771   case IITDescriptor::Struct: {
 772     Type *Elts[5];
 773     assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
 774     for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
 775       Elts[i] = DecodeFixedType(Infos, Tys, Context);
 776     return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
 777   }
 778
 779   case IITDescriptor::Argument:
 780     return Tys[D.getArgumentNumber()];
 781   case IITDescriptor::ExtendArgument: {
 782     Type *Ty = Tys[D.getArgumentNumber()];
 783     if (VectorType *VTy = dyn_cast<VectorType>(Ty))
 784       return VectorType::getExtendedElementVectorType(VTy);
 785
 786     return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
 787   }
 788   case IITDescriptor::TruncArgument: {
 789     Type *Ty = Tys[D.getArgumentNumber()];
 790     if (VectorType *VTy = dyn_cast<VectorType>(Ty))
 791       return VectorType::getTruncatedElementVectorType(VTy);
 792
 793     IntegerType *ITy = cast<IntegerType>(Ty);
 794     assert(ITy->getBitWidth() % 2 == 0);
 795     return IntegerType::get(Context, ITy->getBitWidth() / 2);
 796   }
 797   case IITDescriptor::HalfVecArgument:
 798     return VectorType::getHalfElementsVectorType(cast<VectorType>(
 799                                                   Tys[D.getArgumentNumber()]));
 800   case IITDescriptor::SameVecWidthArgument: {
 801     Type *EltTy = DecodeFixedType(Infos, Tys, Context);
 802     Type *Ty = Tys[D.getArgumentNumber()];
 803     if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
 804       return VectorType::get(EltTy, VTy->getNumElements());
 805     }
 806     llvm_unreachable("unhandled");
 807   }
 808   case IITDescriptor::PtrToArgument: {
 809     Type *Ty = Tys[D.getArgumentNumber()];
 810     return PointerType::getUnqual(Ty);
 811   }
 812   case IITDescriptor::VecOfPtrsToElt: {
 813     Type *Ty = Tys[D.getArgumentNumber()];
 814     VectorType *VTy = dyn_cast<VectorType>(Ty);
 815     if (!VTy)
 816       llvm_unreachable("Expected an argument of Vector Type");
 817     Type *EltTy = VTy->getVectorElementType();
 818     return VectorType::get(PointerType::getUnqual(EltTy),
 819                            VTy->getNumElements());
 820   }
 821  }
 822   llvm_unreachable("unhandled");
 823 }
 824
 825
 826
 827 FunctionType *Intrinsic::getType(LLVMContext &Context,
 828                                  ID id, ArrayRef<Type*> Tys) {
 829   SmallVector<IITDescriptor, 8> Table;
 830   getIntrinsicInfoTableEntries(id, Table);
 831
 832   ArrayRef<IITDescriptor> TableRef = Table;
 833   Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
 834
 835   SmallVector<Type*, 8> ArgTys;
 836   while (!TableRef.empty())
 837     ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
 838
 839   // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
 840   // If we see void type as the type of the last argument, it is vararg intrinsic
 841   if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
 842     ArgTys.pop_back();
 843     return FunctionType::get(ResultTy, ArgTys, true);
 844   }
 845   return FunctionType::get(ResultTy, ArgTys, false);
 846 }
 847
 848 bool Intrinsic::isOverloaded(ID id) {
 849 #define GET_INTRINSIC_OVERLOAD_TABLE
 850 #include "llvm/IR/Intrinsics.gen"
 851 #undef GET_INTRINSIC_OVERLOAD_TABLE
 852 }
 853
 854 bool Intrinsic::isLeaf(ID id) {
 855   switch (id) {
 856   default:
 857     return true;
 858
 859   case Intrinsic::experimental_gc_statepoint:
 860   case Intrinsic::experimental_patchpoint_void:
 861   case Intrinsic::experimental_patchpoint_i64:
 862     return false;
 863   }
 864 }
 865
 866 /// This defines the "Intrinsic::getAttributes(ID id)" method.
 867 #define GET_INTRINSIC_ATTRIBUTES
 868 #include "llvm/IR/Intrinsics.gen"
 869 #undef GET_INTRINSIC_ATTRIBUTES
 870
 871 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
 872   // There can never be multiple globals with the same name of different types,
 873   // because intrinsics must be a specific type.
 874   return
 875     cast<Function>(M->getOrInsertFunction(getName(id, Tys),
 876                                           getType(M->getContext(), id, Tys)));
 877 }
 878
 879 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
 880 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
 881 #include "llvm/IR/Intrinsics.gen"
 882 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
 883
 884 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
 885 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
 886 #include "llvm/IR/Intrinsics.gen"
 887 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
 888
 889 /// hasAddressTaken - returns true if there are any uses of this function
 890 /// other than direct calls or invokes to it.
 891 bool Function::hasAddressTaken(const User* *PutOffender) const {
 892   for (const Use &U : uses()) {
 893     const User *FU = U.getUser();
 894     if (isa<BlockAddress>(FU))
 895       continue;
 896     if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
 897       return PutOffender ? (*PutOffender = FU, true) : true;
 898     ImmutableCallSite CS(cast<Instruction>(FU));
 899     if (!CS.isCallee(&U))
 900       return PutOffender ? (*PutOffender = FU, true) : true;
 901   }
 902   return false;
 903 }
 904
 905 bool Function::isDefTriviallyDead() const {
 906   // Check the linkage
 907   if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
 908       !hasAvailableExternallyLinkage())
 909     return false;
 910
 911   // Check if the function is used by anything other than a blockaddress.
 912   for (const User *U : users())
 913     if (!isa<BlockAddress>(U))
 914       return false;
 915
 916   return true;
 917 }
 918
 919 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
 920 /// setjmp or other function that gcc recognizes as "returning twice".
 921 bool Function::callsFunctionThatReturnsTwice() const {
 922   for (const_inst_iterator
 923          I = inst_begin(this), E = inst_end(this); I != E; ++I) {
 924     ImmutableCallSite CS(&*I);
 925     if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
 926       return true;
 927   }
 928
 929   return false;
 930 }
 931
 932 static Constant *
 933 getFunctionData(const Function *F,
 934                 const LLVMContextImpl::FunctionDataMapTy &Map) {
 935   const auto &Entry = Map.find(F);
 936   assert(Entry != Map.end());
 937   return cast<Constant>(Entry->second->getReturnValue());
 938 }
 939
 940 /// setFunctionData - Set "Map[F] = Data". Return an updated SubclassData value
 941 /// in which Bit is low iff Data is null.
 942 static unsigned setFunctionData(Function *F,
 943                                 LLVMContextImpl::FunctionDataMapTy &Map,
 944                                 Constant *Data, unsigned SCData, unsigned Bit) {
 945   ReturnInst *&Holder = Map[F];
 946   if (Data) {
 947     if (Holder)
 948       Holder->setOperand(0, Data);
 949     else
 950       Holder = ReturnInst::Create(F->getContext(), Data);
 951     return SCData | (1 << Bit);
 952   } else {
 953     delete Holder;
 954     Map.erase(F);
 955     return SCData & ~(1 << Bit);
 956   }
 957 }
 958
 959 Constant *Function::getPrefixData() const {
 960   assert(hasPrefixData());
 961   return getFunctionData(this, getContext().pImpl->PrefixDataMap);
 962 }
 963
 964 void Function::setPrefixData(Constant *PrefixData) {
 965   if (!PrefixData && !hasPrefixData())
 966     return;
 967
 968   unsigned SCData = getSubclassDataFromValue();
 969   SCData = setFunctionData(this, getContext().pImpl->PrefixDataMap, PrefixData,
 970                            SCData, /*Bit=*/1);
 971   setValueSubclassData(SCData);
 972 }
 973
 974 Constant *Function::getPrologueData() const {
 975   assert(hasPrologueData());
 976   return getFunctionData(this, getContext().pImpl->PrologueDataMap);
 977 }
 978
 979 void Function::setPrologueData(Constant *PrologueData) {
 980   if (!PrologueData && !hasPrologueData())
 981     return;
 982
 983   unsigned SCData = getSubclassDataFromValue();
 984   SCData = setFunctionData(this, getContext().pImpl->PrologueDataMap,
 985                            PrologueData, SCData, /*Bit=*/2);
 986   setValueSubclassData(SCData);
 987 }
 988
 989 void Function::setEntryCount(uint64_t Count) {
 990   MDBuilder MDB(getContext());
 991   setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count));
 992 }
 993
 994 Optional<uint64_t> Function::getEntryCount() const {
 995   MDNode *MD = getMetadata(LLVMContext::MD_prof);
 996   if (MD && MD->getOperand(0))
 997     if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
 998       if (MDS->getString().equals("function_entry_count")) {
 999         ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1000         return CI->getValue().getZExtValue();
1001       }
1002   return None;
1003 }
1004
1005 void Function::setPersonalityFn(Constant *C) {
1006   if (!C) {
1007     if (hasPersonalityFn()) {
1008       // Note, the num operands is used to compute the offset of the operand, so
1009       // the order here matters.  Clearing the operand then clearing the num
1010       // operands ensures we have the correct offset to the operand.
1011       Op<0>().set(nullptr);
1012       setFunctionNumOperands(0);
1013     }
1014   } else {
1015     // Note, the num operands is used to compute the offset of the operand, so
1016     // the order here matters.  We need to set num operands to 1 first so that
1017     // we get the correct offset to the first operand when we set it.
1018     if (!hasPersonalityFn())
1019       setFunctionNumOperands(1);
1020     Op<0>().set(C);
1021   }
1022 }