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/AsmParser/Parser.h"
11#include "llvm/IR/Constants.h"
12#include "llvm/IR/DerivedTypes.h"
13#include "llvm/IR/InstrTypes.h"
14#include "llvm/IR/Instruction.h"
15#include "llvm/IR/LLVMContext.h"
16#include "llvm/IR/Module.h"
17#include "llvm/Support/SourceMgr.h"
18#include "llvm-c/Core.h"
19#include "gtest/gtest.h"
20
21namespace llvm {
22namespace {
23
24TEST(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
106TEST(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
120TEST(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
130TEST(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    std::string __s;                                            	\
183    raw_string_ostream __o(__s);                                	\
184    Instruction *__I = cast<ConstantExpr>(x)->getAsInstruction();	\
185    __I->print(__o);      						\
186    delete __I; 							\
187    __o.flush();                                                	\
188    EXPECT_EQ(std::string("  <badref> = " y), __s);             	\
189  }
190
191TEST(ConstantsTest, AsInstructionsTest) {
192  LLVMContext Context;
193  std::unique_ptr<Module> M(new Module("MyModule", Context));
194
195  Type *Int64Ty = Type::getInt64Ty(Context);
196  Type *Int32Ty = Type::getInt32Ty(Context);
197  Type *Int16Ty = Type::getInt16Ty(Context);
198  Type *Int1Ty = Type::getInt1Ty(Context);
199  Type *FloatTy = Type::getFloatTy(Context);
200  Type *DoubleTy = Type::getDoubleTy(Context);
201
202  Constant *Global = M->getOrInsertGlobal("dummy",
203                                         PointerType::getUnqual(Int32Ty));
204  Constant *Global2 = M->getOrInsertGlobal("dummy2",
205                                         PointerType::getUnqual(Int32Ty));
206
207  Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
208  Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
209  Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
210  Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
211  Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
212  Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
213  Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
214
215  Constant *One = ConstantInt::get(Int32Ty, 1);
216  Constant *Two = ConstantInt::get(Int64Ty, 2);
217  Constant *Big = ConstantInt::get(Context, APInt{256, uint64_t(-1), true});
218  Constant *Elt = ConstantInt::get(Int16Ty, 2015);
219  Constant *Undef16  = UndefValue::get(Int16Ty);
220  Constant *Undef64  = UndefValue::get(Int64Ty);
221  Constant *UndefV16 = UndefValue::get(P6->getType());
222
223  #define P0STR "ptrtoint (i32** @dummy to i32)"
224  #define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
225  #define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
226  #define P3STR "ptrtoint (i32** @dummy to i1)"
227  #define P4STR "ptrtoint (i32** @dummy2 to i32)"
228  #define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
229  #define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
230
231  CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
232  CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
233  CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
234  CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
235  CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
236        P0STR);
237  CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
238        P0STR);
239  CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
240  CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
241  CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
242  CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
243  CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
244  CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
245  CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
246  CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
247  CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
248  CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
249  CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
250  CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
251  CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
252  CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
253  CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
254  CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
255  CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
256        P0STR);
257  CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
258  CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
259  CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
260  CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
261
262  CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
263  CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
264  CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
265        " to float");
266  CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
267        " to double");
268
269  CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
270
271  CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
272        ", i32 " P4STR);
273  CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
274        ", " P4STR);
275  CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
276        P1STR ", " P5STR);
277
278  std::vector<Constant*> V;
279  V.push_back(One);
280  // FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
281  //        not a normal one!
282  //CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
283  //      "getelementptr i32*, i32** @dummy, i32 1");
284  CHECK(ConstantExpr::getInBoundsGetElementPtr(PointerType::getUnqual(Int32Ty),
285                                               Global, V),
286        "getelementptr inbounds i32*, i32** @dummy, i32 1");
287
288  CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
289        P6STR ", i32 1");
290
291  EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Two));
292  EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Big));
293  EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Undef64));
294
295  EXPECT_EQ(Elt, ConstantExpr::getExtractElement(
296                 ConstantExpr::getInsertElement(P6, Elt, One), One));
297  EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Two));
298  EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Big));
299  EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Undef64));
300}
301
302#ifdef GTEST_HAS_DEATH_TEST
303#ifndef NDEBUG
304TEST(ConstantsTest, ReplaceWithConstantTest) {
305  LLVMContext Context;
306  std::unique_ptr<Module> M(new Module("MyModule", Context));
307
308  Type *Int32Ty = Type::getInt32Ty(Context);
309  Constant *One = ConstantInt::get(Int32Ty, 1);
310
311  Constant *Global =
312      M->getOrInsertGlobal("dummy", PointerType::getUnqual(Int32Ty));
313  Constant *GEP = ConstantExpr::getGetElementPtr(
314      PointerType::getUnqual(Int32Ty), Global, One);
315  EXPECT_DEATH(Global->replaceAllUsesWith(GEP),
316               "this->replaceAllUsesWith\\(expr\\(this\\)\\) is NOT valid!");
317}
318
319#endif
320#endif
321
322#undef CHECK
323
324TEST(ConstantsTest, ConstantArrayReplaceWithConstant) {
325  LLVMContext Context;
326  std::unique_ptr<Module> M(new Module("MyModule", Context));
327
328  Type *IntTy = Type::getInt8Ty(Context);
329  ArrayType *ArrayTy = ArrayType::get(IntTy, 2);
330  Constant *A01Vals[2] = {ConstantInt::get(IntTy, 0),
331                          ConstantInt::get(IntTy, 1)};
332  Constant *A01 = ConstantArray::get(ArrayTy, A01Vals);
333
334  Constant *Global = new GlobalVariable(*M, IntTy, false,
335                                        GlobalValue::ExternalLinkage, nullptr);
336  Constant *GlobalInt = ConstantExpr::getPtrToInt(Global, IntTy);
337  Constant *A0GVals[2] = {ConstantInt::get(IntTy, 0), GlobalInt};
338  Constant *A0G = ConstantArray::get(ArrayTy, A0GVals);
339  ASSERT_NE(A01, A0G);
340
341  GlobalVariable *RefArray =
342      new GlobalVariable(*M, ArrayTy, false, GlobalValue::ExternalLinkage, A0G);
343  ASSERT_EQ(A0G, RefArray->getInitializer());
344
345  GlobalInt->replaceAllUsesWith(ConstantInt::get(IntTy, 1));
346  ASSERT_EQ(A01, RefArray->getInitializer());
347}
348
349TEST(ConstantsTest, ConstantExprReplaceWithConstant) {
350  LLVMContext Context;
351  std::unique_ptr<Module> M(new Module("MyModule", Context));
352
353  Type *IntTy = Type::getInt8Ty(Context);
354  Constant *G1 = new GlobalVariable(*M, IntTy, false,
355                                    GlobalValue::ExternalLinkage, nullptr);
356  Constant *G2 = new GlobalVariable(*M, IntTy, false,
357                                    GlobalValue::ExternalLinkage, nullptr);
358  ASSERT_NE(G1, G2);
359
360  Constant *Int1 = ConstantExpr::getPtrToInt(G1, IntTy);
361  Constant *Int2 = ConstantExpr::getPtrToInt(G2, IntTy);
362  ASSERT_NE(Int1, Int2);
363
364  GlobalVariable *Ref =
365      new GlobalVariable(*M, IntTy, false, GlobalValue::ExternalLinkage, Int1);
366  ASSERT_EQ(Int1, Ref->getInitializer());
367
368  G1->replaceAllUsesWith(G2);
369  ASSERT_EQ(Int2, Ref->getInitializer());
370}
371
372TEST(ConstantsTest, GEPReplaceWithConstant) {
373  LLVMContext Context;
374  std::unique_ptr<Module> M(new Module("MyModule", Context));
375
376  Type *IntTy = Type::getInt32Ty(Context);
377  Type *PtrTy = PointerType::get(IntTy, 0);
378  auto *C1 = ConstantInt::get(IntTy, 1);
379  auto *Placeholder = new GlobalVariable(
380      *M, IntTy, false, GlobalValue::ExternalWeakLinkage, nullptr);
381  auto *GEP = ConstantExpr::getGetElementPtr(IntTy, Placeholder, C1);
382  ASSERT_EQ(GEP->getOperand(0), Placeholder);
383
384  auto *Ref =
385      new GlobalVariable(*M, PtrTy, false, GlobalValue::ExternalLinkage, GEP);
386  ASSERT_EQ(GEP, Ref->getInitializer());
387
388  auto *Global = new GlobalVariable(*M, PtrTy, false,
389                                    GlobalValue::ExternalLinkage, nullptr);
390  auto *Alias = GlobalAlias::create(IntTy, 0, GlobalValue::ExternalLinkage,
391                                    "alias", Global, M.get());
392  Placeholder->replaceAllUsesWith(Alias);
393  ASSERT_EQ(GEP, Ref->getInitializer());
394  ASSERT_EQ(GEP->getOperand(0), Alias);
395}
396
397TEST(ConstantsTest, AliasCAPI) {
398  LLVMContext Context;
399  SMDiagnostic Error;
400  std::unique_ptr<Module> M =
401      parseAssemblyString("@g = global i32 42", Error, Context);
402  GlobalVariable *G = M->getGlobalVariable("g");
403  Type *I16Ty = Type::getInt16Ty(Context);
404  Type *I16PTy = PointerType::get(I16Ty, 0);
405  Constant *Aliasee = ConstantExpr::getBitCast(G, I16PTy);
406  LLVMValueRef AliasRef =
407      LLVMAddAlias(wrap(M.get()), wrap(I16PTy), wrap(Aliasee), "a");
408  ASSERT_EQ(unwrap<GlobalAlias>(AliasRef)->getAliasee(), Aliasee);
409}
410
411static std::string getNameOfType(Type *T) {
412  std::string S;
413  raw_string_ostream RSOS(S);
414  T->print(RSOS);
415  return S;
416}
417
418TEST(ConstantsTest, BuildConstantDataArrays) {
419  LLVMContext Context;
420  std::unique_ptr<Module> M(new Module("MyModule", Context));
421
422  for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
423                  Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
424    ArrayType *ArrayTy = ArrayType::get(T, 2);
425    Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
426    Constant *CDV = ConstantArray::get(ArrayTy, Vals);
427    ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
428        << " T = " << getNameOfType(T);
429  }
430
431  for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
432                  Type::getDoubleTy(Context)}) {
433    ArrayType *ArrayTy = ArrayType::get(T, 2);
434    Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
435    Constant *CDV = ConstantArray::get(ArrayTy, Vals);
436    ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
437        << " T = " << getNameOfType(T);
438  }
439}
440
441TEST(ConstantsTest, BuildConstantDataVectors) {
442  LLVMContext Context;
443  std::unique_ptr<Module> M(new Module("MyModule", Context));
444
445  for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
446                  Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
447    Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
448    Constant *CDV = ConstantVector::get(Vals);
449    ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
450        << " T = " << getNameOfType(T);
451  }
452
453  for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
454                  Type::getDoubleTy(Context)}) {
455    Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
456    Constant *CDV = ConstantVector::get(Vals);
457    ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
458        << " T = " << getNameOfType(T);
459  }
460}
461
462TEST(ConstantsTest, BitcastToGEP) {
463  LLVMContext Context;
464  std::unique_ptr<Module> M(new Module("MyModule", Context));
465
466  auto *i32 = Type::getInt32Ty(Context);
467  auto *U = StructType::create(Context, "Unsized");
468  Type *EltTys[] = {i32, U};
469  auto *S = StructType::create(EltTys);
470
471  auto *G = new GlobalVariable(*M, S, false,
472                               GlobalValue::ExternalLinkage, nullptr);
473  auto *PtrTy = PointerType::get(i32, 0);
474  auto *C = ConstantExpr::getBitCast(G, PtrTy);
475  ASSERT_EQ(dyn_cast<ConstantExpr>(C)->getOpcode(),
476            Instruction::BitCast);
477}
478
479}  // end anonymous namespace
480}  // end namespace llvm
481