unittests/IR/ConstantsTest.cpp

   1 //===- llvm/unittest/IR/ConstantsTest.cpp - Constants unit tests ----------===//
   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 #include "llvm/IR/Constants.h"
  11 #include "llvm-c/Core.h"
  12 #include "llvm/AsmParser/Parser.h"
  13 #include "llvm/IR/DerivedTypes.h"
  14 #include "llvm/IR/InstrTypes.h"
  15 #include "llvm/IR/Instruction.h"
  16 #include "llvm/IR/LLVMContext.h"
  17 #include "llvm/IR/Module.h"
  18 #include "llvm/Support/SourceMgr.h"
  19 #include "gtest/gtest.h"
  20
  21 namespace llvm {
  22 namespace {
  23
  24 TEST(ConstantsTest, Integer_i1) {
  25   LLVMContext Context;
  26   IntegerType *Int1 = IntegerType::get(Context, 1);
  27   Constant* One = ConstantInt::get(Int1, 1, true);
  28   Constant* Zero = ConstantInt::get(Int1, 0);
  29   Constant* NegOne = ConstantInt::get(Int1, static_cast<uint64_t>(-1), true);
  30   EXPECT_EQ(NegOne, ConstantInt::getSigned(Int1, -1));
  31   Constant* Undef = UndefValue::get(Int1);
  32
  33   // Input:  @b = constant i1 add(i1 1 , i1 1)
  34   // Output: @b = constant i1 false
  35   EXPECT_EQ(Zero, ConstantExpr::getAdd(One, One));
  36
  37   // @c = constant i1 add(i1 -1, i1 1)
  38   // @c = constant i1 false
  39   EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, One));
  40
  41   // @d = constant i1 add(i1 -1, i1 -1)
  42   // @d = constant i1 false
  43   EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, NegOne));
  44
  45   // @e = constant i1 sub(i1 -1, i1 1)
  46   // @e = constant i1 false
  47   EXPECT_EQ(Zero, ConstantExpr::getSub(NegOne, One));
  48
  49   // @f = constant i1 sub(i1 1 , i1 -1)
  50   // @f = constant i1 false
  51   EXPECT_EQ(Zero, ConstantExpr::getSub(One, NegOne));
  52
  53   // @g = constant i1 sub(i1 1 , i1 1)
  54   // @g = constant i1 false
  55   EXPECT_EQ(Zero, ConstantExpr::getSub(One, One));
  56
  57   // @h = constant i1 shl(i1 1 , i1 1)  ; undefined
  58   // @h = constant i1 undef
  59   EXPECT_EQ(Undef, ConstantExpr::getShl(One, One));
  60
  61   // @i = constant i1 shl(i1 1 , i1 0)
  62   // @i = constant i1 true
  63   EXPECT_EQ(One, ConstantExpr::getShl(One, Zero));
  64
  65   // @j = constant i1 lshr(i1 1, i1 1)  ; undefined
  66   // @j = constant i1 undef
  67   EXPECT_EQ(Undef, ConstantExpr::getLShr(One, One));
  68
  69   // @m = constant i1 ashr(i1 1, i1 1)  ; undefined
  70   // @m = constant i1 undef
  71   EXPECT_EQ(Undef, ConstantExpr::getAShr(One, One));
  72
  73   // @n = constant i1 mul(i1 -1, i1 1)
  74   // @n = constant i1 true
  75   EXPECT_EQ(One, ConstantExpr::getMul(NegOne, One));
  76
  77   // @o = constant i1 sdiv(i1 -1, i1 1) ; overflow
  78   // @o = constant i1 true
  79   EXPECT_EQ(One, ConstantExpr::getSDiv(NegOne, One));
  80
  81   // @p = constant i1 sdiv(i1 1 , i1 -1); overflow
  82   // @p = constant i1 true
  83   EXPECT_EQ(One, ConstantExpr::getSDiv(One, NegOne));
  84
  85   // @q = constant i1 udiv(i1 -1, i1 1)
  86   // @q = constant i1 true
  87   EXPECT_EQ(One, ConstantExpr::getUDiv(NegOne, One));
  88
  89   // @r = constant i1 udiv(i1 1, i1 -1)
  90   // @r = constant i1 true
  91   EXPECT_EQ(One, ConstantExpr::getUDiv(One, NegOne));
  92
  93   // @s = constant i1 srem(i1 -1, i1 1) ; overflow
  94   // @s = constant i1 false
  95   EXPECT_EQ(Zero, ConstantExpr::getSRem(NegOne, One));
  96
  97   // @t = constant i1 urem(i1 -1, i1 1)
  98   // @t = constant i1 false
  99   EXPECT_EQ(Zero, ConstantExpr::getURem(NegOne, One));
 100
 101   // @u = constant i1 srem(i1  1, i1 -1) ; overflow
 102   // @u = constant i1 false
 103   EXPECT_EQ(Zero, ConstantExpr::getSRem(One, NegOne));
 104 }
 105
 106 TEST(ConstantsTest, IntSigns) {
 107   LLVMContext Context;
 108   IntegerType *Int8Ty = Type::getInt8Ty(Context);
 109   EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, false)->getSExtValue());
 110   EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, true)->getSExtValue());
 111   EXPECT_EQ(100, ConstantInt::getSigned(Int8Ty, 100)->getSExtValue());
 112   EXPECT_EQ(-50, ConstantInt::get(Int8Ty, 206)->getSExtValue());
 113   EXPECT_EQ(-50, ConstantInt::getSigned(Int8Ty, -50)->getSExtValue());
 114   EXPECT_EQ(206U, ConstantInt::getSigned(Int8Ty, -50)->getZExtValue());
 115
 116   // Overflow is handled by truncation.
 117   EXPECT_EQ(0x3b, ConstantInt::get(Int8Ty, 0x13b)->getSExtValue());
 118 }
 119
 120 TEST(ConstantsTest, FP128Test) {
 121   LLVMContext Context;
 122   Type *FP128Ty = Type::getFP128Ty(Context);
 123
 124   IntegerType *Int128Ty = Type::getIntNTy(Context, 128);
 125   Constant *Zero128 = Constant::getNullValue(Int128Ty);
 126   Constant *X = ConstantExpr::getUIToFP(Zero128, FP128Ty);
 127   EXPECT_TRUE(isa<ConstantFP>(X));
 128 }
 129
 130 TEST(ConstantsTest, PointerCast) {
 131   LLVMContext C;
 132   Type *Int8PtrTy = Type::getInt8PtrTy(C);
 133   Type *Int32PtrTy = Type::getInt32PtrTy(C);
 134   Type *Int64Ty = Type::getInt64Ty(C);
 135   VectorType *Int8PtrVecTy = VectorType::get(Int8PtrTy, 4);
 136   VectorType *Int32PtrVecTy = VectorType::get(Int32PtrTy, 4);
 137   VectorType *Int64VecTy = VectorType::get(Int64Ty, 4);
 138
 139   // ptrtoint i8* to i64
 140   EXPECT_EQ(Constant::getNullValue(Int64Ty),
 141             ConstantExpr::getPointerCast(
 142               Constant::getNullValue(Int8PtrTy), Int64Ty));
 143
 144   // bitcast i8* to i32*
 145   EXPECT_EQ(Constant::getNullValue(Int32PtrTy),
 146             ConstantExpr::getPointerCast(
 147               Constant::getNullValue(Int8PtrTy), Int32PtrTy));
 148
 149   // ptrtoint <4 x i8*> to <4 x i64>
 150   EXPECT_EQ(Constant::getNullValue(Int64VecTy),
 151             ConstantExpr::getPointerCast(
 152               Constant::getNullValue(Int8PtrVecTy), Int64VecTy));
 153
 154   // bitcast <4 x i8*> to <4 x i32*>
 155   EXPECT_EQ(Constant::getNullValue(Int32PtrVecTy),
 156             ConstantExpr::getPointerCast(
 157               Constant::getNullValue(Int8PtrVecTy), Int32PtrVecTy));
 158
 159   Type *Int32Ptr1Ty = Type::getInt32PtrTy(C, 1);
 160   ConstantInt *K = ConstantInt::get(Type::getInt64Ty(C), 1234);
 161
 162   // Make sure that addrspacecast of inttoptr is not folded away.
 163   EXPECT_NE(K,
 164             ConstantExpr::getAddrSpaceCast(
 165               ConstantExpr::getIntToPtr(K, Int32PtrTy), Int32Ptr1Ty));
 166   EXPECT_NE(K,
 167             ConstantExpr::getAddrSpaceCast(
 168               ConstantExpr::getIntToPtr(K, Int32Ptr1Ty), Int32PtrTy));
 169
 170   Constant *NullInt32Ptr0 = Constant::getNullValue(Int32PtrTy);
 171   Constant *NullInt32Ptr1 = Constant::getNullValue(Int32Ptr1Ty);
 172
 173   // Make sure that addrspacecast of null is not folded away.
 174   EXPECT_NE(Constant::getNullValue(Int32PtrTy),
 175             ConstantExpr::getAddrSpaceCast(NullInt32Ptr0, Int32Ptr1Ty));
 176
 177   EXPECT_NE(Constant::getNullValue(Int32Ptr1Ty),
 178             ConstantExpr::getAddrSpaceCast(NullInt32Ptr1, Int32PtrTy));
 179 }
 180
 181 #define CHECK(x, y)                                                            \
 182   {                                                                            \
 183     std::string __s;                                                           \
 184     raw_string_ostream __o(__s);                                               \
 185     Instruction *__I = cast<ConstantExpr>(x)->getAsInstruction();              \
 186     __I->print(__o);                                                           \
 187     __I->deleteValue();                                                        \
 188     __o.flush();                                                               \
 189     EXPECT_EQ(std::string("  <badref> = " y), __s);                            \
 190   }
 191
 192 TEST(ConstantsTest, AsInstructionsTest) {
 193   LLVMContext Context;
 194   std::unique_ptr<Module> M(new Module("MyModule", Context));
 195
 196   Type *Int64Ty = Type::getInt64Ty(Context);
 197   Type *Int32Ty = Type::getInt32Ty(Context);
 198   Type *Int16Ty = Type::getInt16Ty(Context);
 199   Type *Int1Ty = Type::getInt1Ty(Context);
 200   Type *FloatTy = Type::getFloatTy(Context);
 201   Type *DoubleTy = Type::getDoubleTy(Context);
 202
 203   Constant *Global = M->getOrInsertGlobal("dummy",
 204                                          PointerType::getUnqual(Int32Ty));
 205   Constant *Global2 = M->getOrInsertGlobal("dummy2",
 206                                          PointerType::getUnqual(Int32Ty));
 207
 208   Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
 209   Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
 210   Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
 211   Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
 212   Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
 213   Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
 214   Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
 215
 216   Constant *One = ConstantInt::get(Int32Ty, 1);
 217   Constant *Two = ConstantInt::get(Int64Ty, 2);
 218   Constant *Big = ConstantInt::get(Context, APInt{256, uint64_t(-1), true});
 219   Constant *Elt = ConstantInt::get(Int16Ty, 2015);
 220   Constant *Undef16  = UndefValue::get(Int16Ty);
 221   Constant *Undef64  = UndefValue::get(Int64Ty);
 222   Constant *UndefV16 = UndefValue::get(P6->getType());
 223
 224   #define P0STR "ptrtoint (i32** @dummy to i32)"
 225   #define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
 226   #define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
 227   #define P3STR "ptrtoint (i32** @dummy to i1)"
 228   #define P4STR "ptrtoint (i32** @dummy2 to i32)"
 229   #define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
 230   #define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
 231
 232   CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
 233   CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
 234   CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
 235   CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
 236   CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
 237         P0STR);
 238   CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
 239         P0STR);
 240   CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
 241   CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
 242   CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
 243   CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
 244   CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
 245   CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
 246   CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
 247   CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
 248   CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
 249   CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
 250   CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
 251   CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
 252   CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
 253   CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
 254   CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
 255   CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
 256   CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
 257         P0STR);
 258   CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
 259   CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
 260   CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
 261   CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
 262
 263   CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
 264   CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
 265   CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
 266         " to float");
 267   CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
 268         " to double");
 269
 270   CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
 271
 272   CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
 273         ", i32 " P4STR);
 274   CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
 275         ", " P4STR);
 276   CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
 277         P1STR ", " P5STR);
 278
 279   std::vector<Constant*> V;
 280   V.push_back(One);
 281   // FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
 282   //        not a normal one!
 283   //CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
 284   //      "getelementptr i32*, i32** @dummy, i32 1");
 285   CHECK(ConstantExpr::getInBoundsGetElementPtr(PointerType::getUnqual(Int32Ty),
 286                                                Global, V),
 287         "getelementptr inbounds i32*, i32** @dummy, i32 1");
 288
 289   CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
 290         P6STR ", i32 1");
 291
 292   EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Two));
 293   EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Big));
 294   EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Undef64));
 295
 296   EXPECT_EQ(Elt, ConstantExpr::getExtractElement(
 297                  ConstantExpr::getInsertElement(P6, Elt, One), One));
 298   EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Two));
 299   EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Big));
 300   EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Undef64));
 301 }
 302
 303 #ifdef GTEST_HAS_DEATH_TEST
 304 #ifndef NDEBUG
 305 TEST(ConstantsTest, ReplaceWithConstantTest) {
 306   LLVMContext Context;
 307   std::unique_ptr<Module> M(new Module("MyModule", Context));
 308
 309   Type *Int32Ty = Type::getInt32Ty(Context);
 310   Constant *One = ConstantInt::get(Int32Ty, 1);
 311
 312   Constant *Global =
 313       M->getOrInsertGlobal("dummy", PointerType::getUnqual(Int32Ty));
 314   Constant *GEP = ConstantExpr::getGetElementPtr(
 315       PointerType::getUnqual(Int32Ty), Global, One);
 316   EXPECT_DEATH(Global->replaceAllUsesWith(GEP),
 317                "this->replaceAllUsesWith\\(expr\\(this\\)\\) is NOT valid!");
 318 }
 319
 320 #endif
 321 #endif
 322
 323 #undef CHECK
 324
 325 TEST(ConstantsTest, ConstantArrayReplaceWithConstant) {
 326   LLVMContext Context;
 327   std::unique_ptr<Module> M(new Module("MyModule", Context));
 328
 329   Type *IntTy = Type::getInt8Ty(Context);
 330   ArrayType *ArrayTy = ArrayType::get(IntTy, 2);
 331   Constant *A01Vals[2] = {ConstantInt::get(IntTy, 0),
 332                           ConstantInt::get(IntTy, 1)};
 333   Constant *A01 = ConstantArray::get(ArrayTy, A01Vals);
 334
 335   Constant *Global = new GlobalVariable(*M, IntTy, false,
 336                                         GlobalValue::ExternalLinkage, nullptr);
 337   Constant *GlobalInt = ConstantExpr::getPtrToInt(Global, IntTy);
 338   Constant *A0GVals[2] = {ConstantInt::get(IntTy, 0), GlobalInt};
 339   Constant *A0G = ConstantArray::get(ArrayTy, A0GVals);
 340   ASSERT_NE(A01, A0G);
 341
 342   GlobalVariable *RefArray =
 343       new GlobalVariable(*M, ArrayTy, false, GlobalValue::ExternalLinkage, A0G);
 344   ASSERT_EQ(A0G, RefArray->getInitializer());
 345
 346   GlobalInt->replaceAllUsesWith(ConstantInt::get(IntTy, 1));
 347   ASSERT_EQ(A01, RefArray->getInitializer());
 348 }
 349
 350 TEST(ConstantsTest, ConstantExprReplaceWithConstant) {
 351   LLVMContext Context;
 352   std::unique_ptr<Module> M(new Module("MyModule", Context));
 353
 354   Type *IntTy = Type::getInt8Ty(Context);
 355   Constant *G1 = new GlobalVariable(*M, IntTy, false,
 356                                     GlobalValue::ExternalLinkage, nullptr);
 357   Constant *G2 = new GlobalVariable(*M, IntTy, false,
 358                                     GlobalValue::ExternalLinkage, nullptr);
 359   ASSERT_NE(G1, G2);
 360
 361   Constant *Int1 = ConstantExpr::getPtrToInt(G1, IntTy);
 362   Constant *Int2 = ConstantExpr::getPtrToInt(G2, IntTy);
 363   ASSERT_NE(Int1, Int2);
 364
 365   GlobalVariable *Ref =
 366       new GlobalVariable(*M, IntTy, false, GlobalValue::ExternalLinkage, Int1);
 367   ASSERT_EQ(Int1, Ref->getInitializer());
 368
 369   G1->replaceAllUsesWith(G2);
 370   ASSERT_EQ(Int2, Ref->getInitializer());
 371 }
 372
 373 TEST(ConstantsTest, GEPReplaceWithConstant) {
 374   LLVMContext Context;
 375   std::unique_ptr<Module> M(new Module("MyModule", Context));
 376
 377   Type *IntTy = Type::getInt32Ty(Context);
 378   Type *PtrTy = PointerType::get(IntTy, 0);
 379   auto *C1 = ConstantInt::get(IntTy, 1);
 380   auto *Placeholder = new GlobalVariable(
 381       *M, IntTy, false, GlobalValue::ExternalWeakLinkage, nullptr);
 382   auto *GEP = ConstantExpr::getGetElementPtr(IntTy, Placeholder, C1);
 383   ASSERT_EQ(GEP->getOperand(0), Placeholder);
 384
 385   auto *Ref =
 386       new GlobalVariable(*M, PtrTy, false, GlobalValue::ExternalLinkage, GEP);
 387   ASSERT_EQ(GEP, Ref->getInitializer());
 388
 389   auto *Global = new GlobalVariable(*M, PtrTy, false,
 390                                     GlobalValue::ExternalLinkage, nullptr);
 391   auto *Alias = GlobalAlias::create(IntTy, 0, GlobalValue::ExternalLinkage,
 392                                     "alias", Global, M.get());
 393   Placeholder->replaceAllUsesWith(Alias);
 394   ASSERT_EQ(GEP, Ref->getInitializer());
 395   ASSERT_EQ(GEP->getOperand(0), Alias);
 396 }
 397
 398 TEST(ConstantsTest, AliasCAPI) {
 399   LLVMContext Context;
 400   SMDiagnostic Error;
 401   std::unique_ptr<Module> M =
 402       parseAssemblyString("@g = global i32 42", Error, Context);
 403   GlobalVariable *G = M->getGlobalVariable("g");
 404   Type *I16Ty = Type::getInt16Ty(Context);
 405   Type *I16PTy = PointerType::get(I16Ty, 0);
 406   Constant *Aliasee = ConstantExpr::getBitCast(G, I16PTy);
 407   LLVMValueRef AliasRef =
 408       LLVMAddAlias(wrap(M.get()), wrap(I16PTy), wrap(Aliasee), "a");
 409   ASSERT_EQ(unwrap<GlobalAlias>(AliasRef)->getAliasee(), Aliasee);
 410 }
 411
 412 static std::string getNameOfType(Type *T) {
 413   std::string S;
 414   raw_string_ostream RSOS(S);
 415   T->print(RSOS);
 416   return S;
 417 }
 418
 419 TEST(ConstantsTest, BuildConstantDataArrays) {
 420   LLVMContext Context;
 421   std::unique_ptr<Module> M(new Module("MyModule", Context));
 422
 423   for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
 424                   Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
 425     ArrayType *ArrayTy = ArrayType::get(T, 2);
 426     Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
 427     Constant *CDV = ConstantArray::get(ArrayTy, Vals);
 428     ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
 429         << " T = " << getNameOfType(T);
 430   }
 431
 432   for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
 433                   Type::getDoubleTy(Context)}) {
 434     ArrayType *ArrayTy = ArrayType::get(T, 2);
 435     Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
 436     Constant *CDV = ConstantArray::get(ArrayTy, Vals);
 437     ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
 438         << " T = " << getNameOfType(T);
 439   }
 440 }
 441
 442 TEST(ConstantsTest, BuildConstantDataVectors) {
 443   LLVMContext Context;
 444   std::unique_ptr<Module> M(new Module("MyModule", Context));
 445
 446   for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
 447                   Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
 448     Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
 449     Constant *CDV = ConstantVector::get(Vals);
 450     ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
 451         << " T = " << getNameOfType(T);
 452   }
 453
 454   for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
 455                   Type::getDoubleTy(Context)}) {
 456     Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
 457     Constant *CDV = ConstantVector::get(Vals);
 458     ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
 459         << " T = " << getNameOfType(T);
 460   }
 461 }
 462
 463 TEST(ConstantsTest, BitcastToGEP) {
 464   LLVMContext Context;
 465   std::unique_ptr<Module> M(new Module("MyModule", Context));
 466
 467   auto *i32 = Type::getInt32Ty(Context);
 468   auto *U = StructType::create(Context, "Unsized");
 469   Type *EltTys[] = {i32, U};
 470   auto *S = StructType::create(EltTys);
 471
 472   auto *G = new GlobalVariable(*M, S, false,
 473                                GlobalValue::ExternalLinkage, nullptr);
 474   auto *PtrTy = PointerType::get(i32, 0);
 475   auto *C = ConstantExpr::getBitCast(G, PtrTy);
 476   ASSERT_EQ(cast<ConstantExpr>(C)->getOpcode(), Instruction::BitCast);
 477 }
 478
 479 }  // end anonymous namespace
 480 }  // end namespace llvm