lib/IR/Type.cpp

   1 //===- Type.cpp - Implement the Type class --------------------------------===//
   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 Type class for the IR library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/IR/Type.h"
  14 #include "LLVMContextImpl.h"
  15 #include "llvm/ADT/APInt.h"
  16 #include "llvm/ADT/None.h"
  17 #include "llvm/ADT/SmallString.h"
  18 #include "llvm/ADT/StringMap.h"
  19 #include "llvm/ADT/StringRef.h"
  20 #include "llvm/IR/Constant.h"
  21 #include "llvm/IR/Constants.h"
  22 #include "llvm/IR/DerivedTypes.h"
  23 #include "llvm/IR/LLVMContext.h"
  24 #include "llvm/IR/Module.h"
  25 #include "llvm/IR/Value.h"
  26 #include "llvm/Support/Casting.h"
  27 #include "llvm/Support/MathExtras.h"
  28 #include "llvm/Support/raw_ostream.h"
  29 #include <cassert>
  30 #include <utility>
  31
  32 using namespace llvm;
  33
  34 //===----------------------------------------------------------------------===//
  35 //                         Type Class Implementation
  36 //===----------------------------------------------------------------------===//
  37
  38 Type *Type::getPrimitiveType(LLVMContext &C, TypeID IDNumber) {
  39   switch (IDNumber) {
  40   case VoidTyID      : return getVoidTy(C);
  41   case HalfTyID      : return getHalfTy(C);
  42   case FloatTyID     : return getFloatTy(C);
  43   case DoubleTyID    : return getDoubleTy(C);
  44   case X86_FP80TyID  : return getX86_FP80Ty(C);
  45   case FP128TyID     : return getFP128Ty(C);
  46   case PPC_FP128TyID : return getPPC_FP128Ty(C);
  47   case LabelTyID     : return getLabelTy(C);
  48   case MetadataTyID  : return getMetadataTy(C);
  49   case X86_MMXTyID   : return getX86_MMXTy(C);
  50   case TokenTyID     : return getTokenTy(C);
  51   default:
  52     return nullptr;
  53   }
  54 }
  55
  56 bool Type::isIntegerTy(unsigned Bitwidth) const {
  57   return isIntegerTy() && cast<IntegerType>(this)->getBitWidth() == Bitwidth;
  58 }
  59
  60 bool Type::canLosslesslyBitCastTo(Type *Ty) const {
  61   // Identity cast means no change so return true
  62   if (this == Ty)
  63     return true;
  64
  65   // They are not convertible unless they are at least first class types
  66   if (!this->isFirstClassType() || !Ty->isFirstClassType())
  67     return false;
  68
  69   // Vector -> Vector conversions are always lossless if the two vector types
  70   // have the same size, otherwise not.  Also, 64-bit vector types can be
  71   // converted to x86mmx.
  72   if (auto *thisPTy = dyn_cast<VectorType>(this)) {
  73     if (auto *thatPTy = dyn_cast<VectorType>(Ty))
  74       return thisPTy->getBitWidth() == thatPTy->getBitWidth();
  75     if (Ty->getTypeID() == Type::X86_MMXTyID &&
  76         thisPTy->getBitWidth() == 64)
  77       return true;
  78   }
  79
  80   if (this->getTypeID() == Type::X86_MMXTyID)
  81     if (auto *thatPTy = dyn_cast<VectorType>(Ty))
  82       if (thatPTy->getBitWidth() == 64)
  83         return true;
  84
  85   // At this point we have only various mismatches of the first class types
  86   // remaining and ptr->ptr. Just select the lossless conversions. Everything
  87   // else is not lossless. Conservatively assume we can't losslessly convert
  88   // between pointers with different address spaces.
  89   if (auto *PTy = dyn_cast<PointerType>(this)) {
  90     if (auto *OtherPTy = dyn_cast<PointerType>(Ty))
  91       return PTy->getAddressSpace() == OtherPTy->getAddressSpace();
  92     return false;
  93   }
  94   return false;  // Other types have no identity values
  95 }
  96
  97 bool Type::isEmptyTy() const {
  98   if (auto *ATy = dyn_cast<ArrayType>(this)) {
  99     unsigned NumElements = ATy->getNumElements();
 100     return NumElements == 0 || ATy->getElementType()->isEmptyTy();
 101   }
 102
 103   if (auto *STy = dyn_cast<StructType>(this)) {
 104     unsigned NumElements = STy->getNumElements();
 105     for (unsigned i = 0; i < NumElements; ++i)
 106       if (!STy->getElementType(i)->isEmptyTy())
 107         return false;
 108     return true;
 109   }
 110
 111   return false;
 112 }
 113
 114 unsigned Type::getPrimitiveSizeInBits() const {
 115   switch (getTypeID()) {
 116   case Type::HalfTyID: return 16;
 117   case Type::FloatTyID: return 32;
 118   case Type::DoubleTyID: return 64;
 119   case Type::X86_FP80TyID: return 80;
 120   case Type::FP128TyID: return 128;
 121   case Type::PPC_FP128TyID: return 128;
 122   case Type::X86_MMXTyID: return 64;
 123   case Type::IntegerTyID: return cast<IntegerType>(this)->getBitWidth();
 124   case Type::VectorTyID:  return cast<VectorType>(this)->getBitWidth();
 125   default: return 0;
 126   }
 127 }
 128
 129 unsigned Type::getScalarSizeInBits() const {
 130   return getScalarType()->getPrimitiveSizeInBits();
 131 }
 132
 133 int Type::getFPMantissaWidth() const {
 134   if (auto *VTy = dyn_cast<VectorType>(this))
 135     return VTy->getElementType()->getFPMantissaWidth();
 136   assert(isFloatingPointTy() && "Not a floating point type!");
 137   if (getTypeID() == HalfTyID) return 11;
 138   if (getTypeID() == FloatTyID) return 24;
 139   if (getTypeID() == DoubleTyID) return 53;
 140   if (getTypeID() == X86_FP80TyID) return 64;
 141   if (getTypeID() == FP128TyID) return 113;
 142   assert(getTypeID() == PPC_FP128TyID && "unknown fp type");
 143   return -1;
 144 }
 145
 146 bool Type::isSizedDerivedType(SmallPtrSetImpl<Type*> *Visited) const {
 147   if (auto *ATy = dyn_cast<ArrayType>(this))
 148     return ATy->getElementType()->isSized(Visited);
 149
 150   if (auto *VTy = dyn_cast<VectorType>(this))
 151     return VTy->getElementType()->isSized(Visited);
 152
 153   return cast<StructType>(this)->isSized(Visited);
 154 }
 155
 156 //===----------------------------------------------------------------------===//
 157 //                          Primitive 'Type' data
 158 //===----------------------------------------------------------------------===//
 159
 160 Type *Type::getVoidTy(LLVMContext &C) { return &C.pImpl->VoidTy; }
 161 Type *Type::getLabelTy(LLVMContext &C) { return &C.pImpl->LabelTy; }
 162 Type *Type::getHalfTy(LLVMContext &C) { return &C.pImpl->HalfTy; }
 163 Type *Type::getFloatTy(LLVMContext &C) { return &C.pImpl->FloatTy; }
 164 Type *Type::getDoubleTy(LLVMContext &C) { return &C.pImpl->DoubleTy; }
 165 Type *Type::getMetadataTy(LLVMContext &C) { return &C.pImpl->MetadataTy; }
 166 Type *Type::getTokenTy(LLVMContext &C) { return &C.pImpl->TokenTy; }
 167 Type *Type::getX86_FP80Ty(LLVMContext &C) { return &C.pImpl->X86_FP80Ty; }
 168 Type *Type::getFP128Ty(LLVMContext &C) { return &C.pImpl->FP128Ty; }
 169 Type *Type::getPPC_FP128Ty(LLVMContext &C) { return &C.pImpl->PPC_FP128Ty; }
 170 Type *Type::getX86_MMXTy(LLVMContext &C) { return &C.pImpl->X86_MMXTy; }
 171
 172 IntegerType *Type::getInt1Ty(LLVMContext &C) { return &C.pImpl->Int1Ty; }
 173 IntegerType *Type::getInt8Ty(LLVMContext &C) { return &C.pImpl->Int8Ty; }
 174 IntegerType *Type::getInt16Ty(LLVMContext &C) { return &C.pImpl->Int16Ty; }
 175 IntegerType *Type::getInt32Ty(LLVMContext &C) { return &C.pImpl->Int32Ty; }
 176 IntegerType *Type::getInt64Ty(LLVMContext &C) { return &C.pImpl->Int64Ty; }
 177 IntegerType *Type::getInt128Ty(LLVMContext &C) { return &C.pImpl->Int128Ty; }
 178
 179 IntegerType *Type::getIntNTy(LLVMContext &C, unsigned N) {
 180   return IntegerType::get(C, N);
 181 }
 182
 183 PointerType *Type::getHalfPtrTy(LLVMContext &C, unsigned AS) {
 184   return getHalfTy(C)->getPointerTo(AS);
 185 }
 186
 187 PointerType *Type::getFloatPtrTy(LLVMContext &C, unsigned AS) {
 188   return getFloatTy(C)->getPointerTo(AS);
 189 }
 190
 191 PointerType *Type::getDoublePtrTy(LLVMContext &C, unsigned AS) {
 192   return getDoubleTy(C)->getPointerTo(AS);
 193 }
 194
 195 PointerType *Type::getX86_FP80PtrTy(LLVMContext &C, unsigned AS) {
 196   return getX86_FP80Ty(C)->getPointerTo(AS);
 197 }
 198
 199 PointerType *Type::getFP128PtrTy(LLVMContext &C, unsigned AS) {
 200   return getFP128Ty(C)->getPointerTo(AS);
 201 }
 202
 203 PointerType *Type::getPPC_FP128PtrTy(LLVMContext &C, unsigned AS) {
 204   return getPPC_FP128Ty(C)->getPointerTo(AS);
 205 }
 206
 207 PointerType *Type::getX86_MMXPtrTy(LLVMContext &C, unsigned AS) {
 208   return getX86_MMXTy(C)->getPointerTo(AS);
 209 }
 210
 211 PointerType *Type::getIntNPtrTy(LLVMContext &C, unsigned N, unsigned AS) {
 212   return getIntNTy(C, N)->getPointerTo(AS);
 213 }
 214
 215 PointerType *Type::getInt1PtrTy(LLVMContext &C, unsigned AS) {
 216   return getInt1Ty(C)->getPointerTo(AS);
 217 }
 218
 219 PointerType *Type::getInt8PtrTy(LLVMContext &C, unsigned AS) {
 220   return getInt8Ty(C)->getPointerTo(AS);
 221 }
 222
 223 PointerType *Type::getInt16PtrTy(LLVMContext &C, unsigned AS) {
 224   return getInt16Ty(C)->getPointerTo(AS);
 225 }
 226
 227 PointerType *Type::getInt32PtrTy(LLVMContext &C, unsigned AS) {
 228   return getInt32Ty(C)->getPointerTo(AS);
 229 }
 230
 231 PointerType *Type::getInt64PtrTy(LLVMContext &C, unsigned AS) {
 232   return getInt64Ty(C)->getPointerTo(AS);
 233 }
 234
 235 //===----------------------------------------------------------------------===//
 236 //                       IntegerType Implementation
 237 //===----------------------------------------------------------------------===//
 238
 239 IntegerType *IntegerType::get(LLVMContext &C, unsigned NumBits) {
 240   assert(NumBits >= MIN_INT_BITS && "bitwidth too small");
 241   assert(NumBits <= MAX_INT_BITS && "bitwidth too large");
 242
 243   // Check for the built-in integer types
 244   switch (NumBits) {
 245   case   1: return cast<IntegerType>(Type::getInt1Ty(C));
 246   case   8: return cast<IntegerType>(Type::getInt8Ty(C));
 247   case  16: return cast<IntegerType>(Type::getInt16Ty(C));
 248   case  32: return cast<IntegerType>(Type::getInt32Ty(C));
 249   case  64: return cast<IntegerType>(Type::getInt64Ty(C));
 250   case 128: return cast<IntegerType>(Type::getInt128Ty(C));
 251   default:
 252     break;
 253   }
 254
 255   IntegerType *&Entry = C.pImpl->IntegerTypes[NumBits];
 256
 257   if (!Entry)
 258     Entry = new (C.pImpl->Alloc) IntegerType(C, NumBits);
 259
 260   return Entry;
 261 }
 262
 263 bool IntegerType::isPowerOf2ByteWidth() const {
 264   unsigned BitWidth = getBitWidth();
 265   return (BitWidth > 7) && isPowerOf2_32(BitWidth);
 266 }
 267
 268 APInt IntegerType::getMask() const {
 269   return APInt::getAllOnesValue(getBitWidth());
 270 }
 271
 272 //===----------------------------------------------------------------------===//
 273 //                       FunctionType Implementation
 274 //===----------------------------------------------------------------------===//
 275
 276 FunctionType::FunctionType(Type *Result, ArrayRef<Type*> Params,
 277                            bool IsVarArgs)
 278   : Type(Result->getContext(), FunctionTyID) {
 279   Type **SubTys = reinterpret_cast<Type**>(this+1);
 280   assert(isValidReturnType(Result) && "invalid return type for function");
 281   setSubclassData(IsVarArgs);
 282
 283   SubTys[0] = Result;
 284
 285   for (unsigned i = 0, e = Params.size(); i != e; ++i) {
 286     assert(isValidArgumentType(Params[i]) &&
 287            "Not a valid type for function argument!");
 288     SubTys[i+1] = Params[i];
 289   }
 290
 291   ContainedTys = SubTys;
 292   NumContainedTys = Params.size() + 1; // + 1 for result type
 293 }
 294
 295 // This is the factory function for the FunctionType class.
 296 FunctionType *FunctionType::get(Type *ReturnType,
 297                                 ArrayRef<Type*> Params, bool isVarArg) {
 298   LLVMContextImpl *pImpl = ReturnType->getContext().pImpl;
 299   const FunctionTypeKeyInfo::KeyTy Key(ReturnType, Params, isVarArg);
 300   FunctionType *FT;
 301   // Since we only want to allocate a fresh function type in case none is found
 302   // and we don't want to perform two lookups (one for checking if existent and
 303   // one for inserting the newly allocated one), here we instead lookup based on
 304   // Key and update the reference to the function type in-place to a newly
 305   // allocated one if not found.
 306   auto Insertion = pImpl->FunctionTypes.insert_as(nullptr, Key);
 307   if (Insertion.second) {
 308     // The function type was not found. Allocate one and update FunctionTypes
 309     // in-place.
 310     FT = (FunctionType *)pImpl->Alloc.Allocate(
 311         sizeof(FunctionType) + sizeof(Type *) * (Params.size() + 1),
 312         alignof(FunctionType));
 313     new (FT) FunctionType(ReturnType, Params, isVarArg);
 314     *Insertion.first = FT;
 315   } else {
 316     // The function type was found. Just return it.
 317     FT = *Insertion.first;
 318   }
 319   return FT;
 320 }
 321
 322 FunctionType *FunctionType::get(Type *Result, bool isVarArg) {
 323   return get(Result, None, isVarArg);
 324 }
 325
 326 bool FunctionType::isValidReturnType(Type *RetTy) {
 327   return !RetTy->isFunctionTy() && !RetTy->isLabelTy() &&
 328   !RetTy->isMetadataTy();
 329 }
 330
 331 bool FunctionType::isValidArgumentType(Type *ArgTy) {
 332   return ArgTy->isFirstClassType();
 333 }
 334
 335 //===----------------------------------------------------------------------===//
 336 //                       StructType Implementation
 337 //===----------------------------------------------------------------------===//
 338
 339 // Primitive Constructors.
 340
 341 StructType *StructType::get(LLVMContext &Context, ArrayRef<Type*> ETypes,
 342                             bool isPacked) {
 343   LLVMContextImpl *pImpl = Context.pImpl;
 344   const AnonStructTypeKeyInfo::KeyTy Key(ETypes, isPacked);
 345
 346   StructType *ST;
 347   // Since we only want to allocate a fresh struct type in case none is found
 348   // and we don't want to perform two lookups (one for checking if existent and
 349   // one for inserting the newly allocated one), here we instead lookup based on
 350   // Key and update the reference to the struct type in-place to a newly
 351   // allocated one if not found.
 352   auto Insertion = pImpl->AnonStructTypes.insert_as(nullptr, Key);
 353   if (Insertion.second) {
 354     // The struct type was not found. Allocate one and update AnonStructTypes
 355     // in-place.
 356     ST = new (Context.pImpl->Alloc) StructType(Context);
 357     ST->setSubclassData(SCDB_IsLiteral);  // Literal struct.
 358     ST->setBody(ETypes, isPacked);
 359     *Insertion.first = ST;
 360   } else {
 361     // The struct type was found. Just return it.
 362     ST = *Insertion.first;
 363   }
 364
 365   return ST;
 366 }
 367
 368 void StructType::setBody(ArrayRef<Type*> Elements, bool isPacked) {
 369   assert(isOpaque() && "Struct body already set!");
 370
 371   setSubclassData(getSubclassData() | SCDB_HasBody);
 372   if (isPacked)
 373     setSubclassData(getSubclassData() | SCDB_Packed);
 374
 375   NumContainedTys = Elements.size();
 376
 377   if (Elements.empty()) {
 378     ContainedTys = nullptr;
 379     return;
 380   }
 381
 382   ContainedTys = Elements.copy(getContext().pImpl->Alloc).data();
 383 }
 384
 385 void StructType::setName(StringRef Name) {
 386   if (Name == getName()) return;
 387
 388   StringMap<StructType *> &SymbolTable = getContext().pImpl->NamedStructTypes;
 389
 390   using EntryTy = StringMap<StructType *>::MapEntryTy;
 391
 392   // If this struct already had a name, remove its symbol table entry. Don't
 393   // delete the data yet because it may be part of the new name.
 394   if (SymbolTableEntry)
 395     SymbolTable.remove((EntryTy *)SymbolTableEntry);
 396
 397   // If this is just removing the name, we're done.
 398   if (Name.empty()) {
 399     if (SymbolTableEntry) {
 400       // Delete the old string data.
 401       ((EntryTy *)SymbolTableEntry)->Destroy(SymbolTable.getAllocator());
 402       SymbolTableEntry = nullptr;
 403     }
 404     return;
 405   }
 406
 407   // Look up the entry for the name.
 408   auto IterBool =
 409       getContext().pImpl->NamedStructTypes.insert(std::make_pair(Name, this));
 410
 411   // While we have a name collision, try a random rename.
 412   if (!IterBool.second) {
 413     SmallString<64> TempStr(Name);
 414     TempStr.push_back('.');
 415     raw_svector_ostream TmpStream(TempStr);
 416     unsigned NameSize = Name.size();
 417
 418     do {
 419       TempStr.resize(NameSize + 1);
 420       TmpStream << getContext().pImpl->NamedStructTypesUniqueID++;
 421
 422       IterBool = getContext().pImpl->NamedStructTypes.insert(
 423           std::make_pair(TmpStream.str(), this));
 424     } while (!IterBool.second);
 425   }
 426
 427   // Delete the old string data.
 428   if (SymbolTableEntry)
 429     ((EntryTy *)SymbolTableEntry)->Destroy(SymbolTable.getAllocator());
 430   SymbolTableEntry = &*IterBool.first;
 431 }
 432
 433 //===----------------------------------------------------------------------===//
 434 // StructType Helper functions.
 435
 436 StructType *StructType::create(LLVMContext &Context, StringRef Name) {
 437   StructType *ST = new (Context.pImpl->Alloc) StructType(Context);
 438   if (!Name.empty())
 439     ST->setName(Name);
 440   return ST;
 441 }
 442
 443 StructType *StructType::get(LLVMContext &Context, bool isPacked) {
 444   return get(Context, None, isPacked);
 445 }
 446
 447 StructType *StructType::create(LLVMContext &Context, ArrayRef<Type*> Elements,
 448                                StringRef Name, bool isPacked) {
 449   StructType *ST = create(Context, Name);
 450   ST->setBody(Elements, isPacked);
 451   return ST;
 452 }
 453
 454 StructType *StructType::create(LLVMContext &Context, ArrayRef<Type*> Elements) {
 455   return create(Context, Elements, StringRef());
 456 }
 457
 458 StructType *StructType::create(LLVMContext &Context) {
 459   return create(Context, StringRef());
 460 }
 461
 462 StructType *StructType::create(ArrayRef<Type*> Elements, StringRef Name,
 463                                bool isPacked) {
 464   assert(!Elements.empty() &&
 465          "This method may not be invoked with an empty list");
 466   return create(Elements[0]->getContext(), Elements, Name, isPacked);
 467 }
 468
 469 StructType *StructType::create(ArrayRef<Type*> Elements) {
 470   assert(!Elements.empty() &&
 471          "This method may not be invoked with an empty list");
 472   return create(Elements[0]->getContext(), Elements, StringRef());
 473 }
 474
 475 bool StructType::isSized(SmallPtrSetImpl<Type*> *Visited) const {
 476   if ((getSubclassData() & SCDB_IsSized) != 0)
 477     return true;
 478   if (isOpaque())
 479     return false;
 480
 481   if (Visited && !Visited->insert(const_cast<StructType*>(this)).second)
 482     return false;
 483
 484   // Okay, our struct is sized if all of the elements are, but if one of the
 485   // elements is opaque, the struct isn't sized *yet*, but may become sized in
 486   // the future, so just bail out without caching.
 487   for (element_iterator I = element_begin(), E = element_end(); I != E; ++I)
 488     if (!(*I)->isSized(Visited))
 489       return false;
 490
 491   // Here we cheat a bit and cast away const-ness. The goal is to memoize when
 492   // we find a sized type, as types can only move from opaque to sized, not the
 493   // other way.
 494   const_cast<StructType*>(this)->setSubclassData(
 495     getSubclassData() | SCDB_IsSized);
 496   return true;
 497 }
 498
 499 StringRef StructType::getName() const {
 500   assert(!isLiteral() && "Literal structs never have names");
 501   if (!SymbolTableEntry) return StringRef();
 502
 503   return ((StringMapEntry<StructType*> *)SymbolTableEntry)->getKey();
 504 }
 505
 506 bool StructType::isValidElementType(Type *ElemTy) {
 507   if (auto *VTy = dyn_cast<VectorType>(ElemTy))
 508     return !VTy->isScalable();
 509   return !ElemTy->isVoidTy() && !ElemTy->isLabelTy() &&
 510          !ElemTy->isMetadataTy() && !ElemTy->isFunctionTy() &&
 511          !ElemTy->isTokenTy();
 512 }
 513
 514 bool StructType::isLayoutIdentical(StructType *Other) const {
 515   if (this == Other) return true;
 516
 517   if (isPacked() != Other->isPacked())
 518     return false;
 519
 520   return elements() == Other->elements();
 521 }
 522
 523 StructType *Module::getTypeByName(StringRef Name) const {
 524   return getContext().pImpl->NamedStructTypes.lookup(Name);
 525 }
 526
 527 //===----------------------------------------------------------------------===//
 528 //                       CompositeType Implementation
 529 //===----------------------------------------------------------------------===//
 530
 531 Type *CompositeType::getTypeAtIndex(const Value *V) const {
 532   if (auto *STy = dyn_cast<StructType>(this)) {
 533     unsigned Idx =
 534       (unsigned)cast<Constant>(V)->getUniqueInteger().getZExtValue();
 535     assert(indexValid(Idx) && "Invalid structure index!");
 536     return STy->getElementType(Idx);
 537   }
 538
 539   return cast<SequentialType>(this)->getElementType();
 540 }
 541
 542 Type *CompositeType::getTypeAtIndex(unsigned Idx) const{
 543   if (auto *STy = dyn_cast<StructType>(this)) {
 544     assert(indexValid(Idx) && "Invalid structure index!");
 545     return STy->getElementType(Idx);
 546   }
 547
 548   return cast<SequentialType>(this)->getElementType();
 549 }
 550
 551 bool CompositeType::indexValid(const Value *V) const {
 552   if (auto *STy = dyn_cast<StructType>(this)) {
 553     // Structure indexes require (vectors of) 32-bit integer constants.  In the
 554     // vector case all of the indices must be equal.
 555     if (!V->getType()->isIntOrIntVectorTy(32))
 556       return false;
 557     const Constant *C = dyn_cast<Constant>(V);
 558     if (C && V->getType()->isVectorTy())
 559       C = C->getSplatValue();
 560     const ConstantInt *CU = dyn_cast_or_null<ConstantInt>(C);
 561     return CU && CU->getZExtValue() < STy->getNumElements();
 562   }
 563
 564   // Sequential types can be indexed by any integer.
 565   return V->getType()->isIntOrIntVectorTy();
 566 }
 567
 568 bool CompositeType::indexValid(unsigned Idx) const {
 569   if (auto *STy = dyn_cast<StructType>(this))
 570     return Idx < STy->getNumElements();
 571   // Sequential types can be indexed by any integer.
 572   return true;
 573 }
 574
 575 //===----------------------------------------------------------------------===//
 576 //                           ArrayType Implementation
 577 //===----------------------------------------------------------------------===//
 578
 579 ArrayType::ArrayType(Type *ElType, uint64_t NumEl)
 580   : SequentialType(ArrayTyID, ElType, NumEl) {}
 581
 582 ArrayType *ArrayType::get(Type *ElementType, uint64_t NumElements) {
 583   assert(isValidElementType(ElementType) && "Invalid type for array element!");
 584
 585   LLVMContextImpl *pImpl = ElementType->getContext().pImpl;
 586   ArrayType *&Entry =
 587     pImpl->ArrayTypes[std::make_pair(ElementType, NumElements)];
 588
 589   if (!Entry)
 590     Entry = new (pImpl->Alloc) ArrayType(ElementType, NumElements);
 591   return Entry;
 592 }
 593
 594 bool ArrayType::isValidElementType(Type *ElemTy) {
 595   if (auto *VTy = dyn_cast<VectorType>(ElemTy))
 596     return !VTy->isScalable();
 597   return !ElemTy->isVoidTy() && !ElemTy->isLabelTy() &&
 598          !ElemTy->isMetadataTy() && !ElemTy->isFunctionTy() &&
 599          !ElemTy->isTokenTy();
 600 }
 601
 602 //===----------------------------------------------------------------------===//
 603 //                          VectorType Implementation
 604 //===----------------------------------------------------------------------===//
 605
 606 VectorType::VectorType(Type *ElType, ElementCount EC)
 607   : SequentialType(VectorTyID, ElType, EC.Min), Scalable(EC.Scalable) {}
 608
 609 VectorType *VectorType::get(Type *ElementType, ElementCount EC) {
 610   assert(EC.Min > 0 && "#Elements of a VectorType must be greater than 0");
 611   assert(isValidElementType(ElementType) && "Element type of a VectorType must "
 612                                             "be an integer, floating point, or "
 613                                             "pointer type.");
 614
 615   LLVMContextImpl *pImpl = ElementType->getContext().pImpl;
 616   VectorType *&Entry = ElementType->getContext().pImpl
 617                                  ->VectorTypes[std::make_pair(ElementType, EC)];
 618   if (!Entry)
 619     Entry = new (pImpl->Alloc) VectorType(ElementType, EC);
 620   return Entry;
 621 }
 622
 623 bool VectorType::isValidElementType(Type *ElemTy) {
 624   return ElemTy->isIntegerTy() || ElemTy->isFloatingPointTy() ||
 625     ElemTy->isPointerTy();
 626 }
 627
 628 //===----------------------------------------------------------------------===//
 629 //                         PointerType Implementation
 630 //===----------------------------------------------------------------------===//
 631
 632 PointerType *PointerType::get(Type *EltTy, unsigned AddressSpace) {
 633   assert(EltTy && "Can't get a pointer to <null> type!");
 634   assert(isValidElementType(EltTy) && "Invalid type for pointer element!");
 635
 636   LLVMContextImpl *CImpl = EltTy->getContext().pImpl;
 637
 638   // Since AddressSpace #0 is the common case, we special case it.
 639   PointerType *&Entry = AddressSpace == 0 ? CImpl->PointerTypes[EltTy]
 640      : CImpl->ASPointerTypes[std::make_pair(EltTy, AddressSpace)];
 641
 642   if (!Entry)
 643     Entry = new (CImpl->Alloc) PointerType(EltTy, AddressSpace);
 644   return Entry;
 645 }
 646
 647 PointerType::PointerType(Type *E, unsigned AddrSpace)
 648   : Type(E->getContext(), PointerTyID), PointeeTy(E) {
 649   ContainedTys = &PointeeTy;
 650   NumContainedTys = 1;
 651   setSubclassData(AddrSpace);
 652 }
 653
 654 PointerType *Type::getPointerTo(unsigned addrs) const {
 655   return PointerType::get(const_cast<Type*>(this), addrs);
 656 }
 657
 658 bool PointerType::isValidElementType(Type *ElemTy) {
 659   return !ElemTy->isVoidTy() && !ElemTy->isLabelTy() &&
 660          !ElemTy->isMetadataTy() && !ElemTy->isTokenTy();
 661 }
 662
 663 bool PointerType::isLoadableOrStorableType(Type *ElemTy) {
 664   return isValidElementType(ElemTy) && !ElemTy->isFunctionTy();
 665 }