lib/IR/Type.cpp

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