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 "gtest/gtest.h"
19
20 namespace llvm {
21 namespace {
22
TEST(ConstantsTest,Integer_i1)23 TEST(ConstantsTest, Integer_i1) {
24 IntegerType* Int1 = IntegerType::get(getGlobalContext(), 1);
25 Constant* One = ConstantInt::get(Int1, 1, true);
26 Constant* Zero = ConstantInt::get(Int1, 0);
27 Constant* NegOne = ConstantInt::get(Int1, static_cast<uint64_t>(-1), true);
28 EXPECT_EQ(NegOne, ConstantInt::getSigned(Int1, -1));
29 Constant* Undef = UndefValue::get(Int1);
30
31 // Input: @b = constant i1 add(i1 1 , i1 1)
32 // Output: @b = constant i1 false
33 EXPECT_EQ(Zero, ConstantExpr::getAdd(One, One));
34
35 // @c = constant i1 add(i1 -1, i1 1)
36 // @c = constant i1 false
37 EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, One));
38
39 // @d = constant i1 add(i1 -1, i1 -1)
40 // @d = constant i1 false
41 EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, NegOne));
42
43 // @e = constant i1 sub(i1 -1, i1 1)
44 // @e = constant i1 false
45 EXPECT_EQ(Zero, ConstantExpr::getSub(NegOne, One));
46
47 // @f = constant i1 sub(i1 1 , i1 -1)
48 // @f = constant i1 false
49 EXPECT_EQ(Zero, ConstantExpr::getSub(One, NegOne));
50
51 // @g = constant i1 sub(i1 1 , i1 1)
52 // @g = constant i1 false
53 EXPECT_EQ(Zero, ConstantExpr::getSub(One, One));
54
55 // @h = constant i1 shl(i1 1 , i1 1) ; undefined
56 // @h = constant i1 undef
57 EXPECT_EQ(Undef, ConstantExpr::getShl(One, One));
58
59 // @i = constant i1 shl(i1 1 , i1 0)
60 // @i = constant i1 true
61 EXPECT_EQ(One, ConstantExpr::getShl(One, Zero));
62
63 // @j = constant i1 lshr(i1 1, i1 1) ; undefined
64 // @j = constant i1 undef
65 EXPECT_EQ(Undef, ConstantExpr::getLShr(One, One));
66
67 // @m = constant i1 ashr(i1 1, i1 1) ; undefined
68 // @m = constant i1 undef
69 EXPECT_EQ(Undef, ConstantExpr::getAShr(One, One));
70
71 // @n = constant i1 mul(i1 -1, i1 1)
72 // @n = constant i1 true
73 EXPECT_EQ(One, ConstantExpr::getMul(NegOne, One));
74
75 // @o = constant i1 sdiv(i1 -1, i1 1) ; overflow
76 // @o = constant i1 true
77 EXPECT_EQ(One, ConstantExpr::getSDiv(NegOne, One));
78
79 // @p = constant i1 sdiv(i1 1 , i1 -1); overflow
80 // @p = constant i1 true
81 EXPECT_EQ(One, ConstantExpr::getSDiv(One, NegOne));
82
83 // @q = constant i1 udiv(i1 -1, i1 1)
84 // @q = constant i1 true
85 EXPECT_EQ(One, ConstantExpr::getUDiv(NegOne, One));
86
87 // @r = constant i1 udiv(i1 1, i1 -1)
88 // @r = constant i1 true
89 EXPECT_EQ(One, ConstantExpr::getUDiv(One, NegOne));
90
91 // @s = constant i1 srem(i1 -1, i1 1) ; overflow
92 // @s = constant i1 false
93 EXPECT_EQ(Zero, ConstantExpr::getSRem(NegOne, One));
94
95 // @t = constant i1 urem(i1 -1, i1 1)
96 // @t = constant i1 false
97 EXPECT_EQ(Zero, ConstantExpr::getURem(NegOne, One));
98
99 // @u = constant i1 srem(i1 1, i1 -1) ; overflow
100 // @u = constant i1 false
101 EXPECT_EQ(Zero, ConstantExpr::getSRem(One, NegOne));
102 }
103
TEST(ConstantsTest,IntSigns)104 TEST(ConstantsTest, IntSigns) {
105 IntegerType* Int8Ty = Type::getInt8Ty(getGlobalContext());
106 EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, false)->getSExtValue());
107 EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, true)->getSExtValue());
108 EXPECT_EQ(100, ConstantInt::getSigned(Int8Ty, 100)->getSExtValue());
109 EXPECT_EQ(-50, ConstantInt::get(Int8Ty, 206)->getSExtValue());
110 EXPECT_EQ(-50, ConstantInt::getSigned(Int8Ty, -50)->getSExtValue());
111 EXPECT_EQ(206U, ConstantInt::getSigned(Int8Ty, -50)->getZExtValue());
112
113 // Overflow is handled by truncation.
114 EXPECT_EQ(0x3b, ConstantInt::get(Int8Ty, 0x13b)->getSExtValue());
115 }
116
TEST(ConstantsTest,FP128Test)117 TEST(ConstantsTest, FP128Test) {
118 Type *FP128Ty = Type::getFP128Ty(getGlobalContext());
119
120 IntegerType *Int128Ty = Type::getIntNTy(getGlobalContext(), 128);
121 Constant *Zero128 = Constant::getNullValue(Int128Ty);
122 Constant *X = ConstantExpr::getUIToFP(Zero128, FP128Ty);
123 EXPECT_TRUE(isa<ConstantFP>(X));
124 }
125
TEST(ConstantsTest,PointerCast)126 TEST(ConstantsTest, PointerCast) {
127 LLVMContext &C(getGlobalContext());
128 Type *Int8PtrTy = Type::getInt8PtrTy(C);
129 Type *Int32PtrTy = Type::getInt32PtrTy(C);
130 Type *Int64Ty = Type::getInt64Ty(C);
131 VectorType *Int8PtrVecTy = VectorType::get(Int8PtrTy, 4);
132 VectorType *Int32PtrVecTy = VectorType::get(Int32PtrTy, 4);
133 VectorType *Int64VecTy = VectorType::get(Int64Ty, 4);
134
135 // ptrtoint i8* to i64
136 EXPECT_EQ(Constant::getNullValue(Int64Ty),
137 ConstantExpr::getPointerCast(
138 Constant::getNullValue(Int8PtrTy), Int64Ty));
139
140 // bitcast i8* to i32*
141 EXPECT_EQ(Constant::getNullValue(Int32PtrTy),
142 ConstantExpr::getPointerCast(
143 Constant::getNullValue(Int8PtrTy), Int32PtrTy));
144
145 // ptrtoint <4 x i8*> to <4 x i64>
146 EXPECT_EQ(Constant::getNullValue(Int64VecTy),
147 ConstantExpr::getPointerCast(
148 Constant::getNullValue(Int8PtrVecTy), Int64VecTy));
149
150 // bitcast <4 x i8*> to <4 x i32*>
151 EXPECT_EQ(Constant::getNullValue(Int32PtrVecTy),
152 ConstantExpr::getPointerCast(
153 Constant::getNullValue(Int8PtrVecTy), Int32PtrVecTy));
154 }
155
156 #define CHECK(x, y) { \
157 std::string __s; \
158 raw_string_ostream __o(__s); \
159 Instruction *__I = cast<ConstantExpr>(x)->getAsInstruction(); \
160 __I->print(__o); \
161 delete __I; \
162 __o.flush(); \
163 EXPECT_EQ(std::string(" <badref> = " y), __s); \
164 }
165
TEST(ConstantsTest,AsInstructionsTest)166 TEST(ConstantsTest, AsInstructionsTest) {
167 std::unique_ptr<Module> M(new Module("MyModule", getGlobalContext()));
168
169 Type *Int64Ty = Type::getInt64Ty(getGlobalContext());
170 Type *Int32Ty = Type::getInt32Ty(getGlobalContext());
171 Type *Int16Ty = Type::getInt16Ty(getGlobalContext());
172 Type *Int1Ty = Type::getInt1Ty(getGlobalContext());
173 Type *FloatTy = Type::getFloatTy(getGlobalContext());
174 Type *DoubleTy = Type::getDoubleTy(getGlobalContext());
175
176 Constant *Global = M->getOrInsertGlobal("dummy",
177 PointerType::getUnqual(Int32Ty));
178 Constant *Global2 = M->getOrInsertGlobal("dummy2",
179 PointerType::getUnqual(Int32Ty));
180
181 Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
182 Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
183 Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
184 Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
185 Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
186 Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
187 Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
188
189 Constant *One = ConstantInt::get(Int32Ty, 1);
190
191 #define P0STR "ptrtoint (i32** @dummy to i32)"
192 #define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
193 #define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
194 #define P3STR "ptrtoint (i32** @dummy to i1)"
195 #define P4STR "ptrtoint (i32** @dummy2 to i32)"
196 #define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
197 #define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
198
199 CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
200 CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
201 CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
202 CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
203 CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
204 P0STR);
205 CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
206 P0STR);
207 CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
208 CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
209 CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
210 CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
211 CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
212 CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
213 CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
214 CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
215 CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
216 CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
217 CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
218 CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
219 CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
220 CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
221 CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
222 CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
223 CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
224 P0STR);
225 CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
226 CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
227 CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
228 CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
229
230 CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
231 CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
232 CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
233 " to float");
234 CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
235 " to double");
236
237 CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
238
239 CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
240 ", i32 " P4STR);
241 CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
242 ", " P4STR);
243 CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
244 P1STR ", " P5STR);
245
246 std::vector<Constant*> V;
247 V.push_back(One);
248 // FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
249 // not a normal one!
250 //CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
251 // "getelementptr i32*, i32** @dummy, i32 1");
252 CHECK(ConstantExpr::getInBoundsGetElementPtr(PointerType::getUnqual(Int32Ty),
253 Global, V),
254 "getelementptr inbounds i32*, i32** @dummy, i32 1");
255
256 CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
257 P6STR ", i32 1");
258 }
259
260 #ifdef GTEST_HAS_DEATH_TEST
261 #ifndef NDEBUG
TEST(ConstantsTest,ReplaceWithConstantTest)262 TEST(ConstantsTest, ReplaceWithConstantTest) {
263 std::unique_ptr<Module> M(new Module("MyModule", getGlobalContext()));
264
265 Type *Int32Ty = Type::getInt32Ty(getGlobalContext());
266 Constant *One = ConstantInt::get(Int32Ty, 1);
267
268 Constant *Global =
269 M->getOrInsertGlobal("dummy", PointerType::getUnqual(Int32Ty));
270 Constant *GEP = ConstantExpr::getGetElementPtr(
271 PointerType::getUnqual(Int32Ty), Global, One);
272 EXPECT_DEATH(Global->replaceAllUsesWith(GEP),
273 "this->replaceAllUsesWith\\(expr\\(this\\)\\) is NOT valid!");
274 }
275
276 #endif
277 #endif
278
279 #undef CHECK
280
TEST(ConstantsTest,ConstantArrayReplaceWithConstant)281 TEST(ConstantsTest, ConstantArrayReplaceWithConstant) {
282 LLVMContext Context;
283 std::unique_ptr<Module> M(new Module("MyModule", Context));
284
285 Type *IntTy = Type::getInt8Ty(Context);
286 ArrayType *ArrayTy = ArrayType::get(IntTy, 2);
287 Constant *A01Vals[2] = {ConstantInt::get(IntTy, 0),
288 ConstantInt::get(IntTy, 1)};
289 Constant *A01 = ConstantArray::get(ArrayTy, A01Vals);
290
291 Constant *Global = new GlobalVariable(*M, IntTy, false,
292 GlobalValue::ExternalLinkage, nullptr);
293 Constant *GlobalInt = ConstantExpr::getPtrToInt(Global, IntTy);
294 Constant *A0GVals[2] = {ConstantInt::get(IntTy, 0), GlobalInt};
295 Constant *A0G = ConstantArray::get(ArrayTy, A0GVals);
296 ASSERT_NE(A01, A0G);
297
298 GlobalVariable *RefArray =
299 new GlobalVariable(*M, ArrayTy, false, GlobalValue::ExternalLinkage, A0G);
300 ASSERT_EQ(A0G, RefArray->getInitializer());
301
302 GlobalInt->replaceAllUsesWith(ConstantInt::get(IntTy, 1));
303 ASSERT_EQ(A01, RefArray->getInitializer());
304 }
305
TEST(ConstantsTest,ConstantExprReplaceWithConstant)306 TEST(ConstantsTest, ConstantExprReplaceWithConstant) {
307 LLVMContext Context;
308 std::unique_ptr<Module> M(new Module("MyModule", Context));
309
310 Type *IntTy = Type::getInt8Ty(Context);
311 Constant *G1 = new GlobalVariable(*M, IntTy, false,
312 GlobalValue::ExternalLinkage, nullptr);
313 Constant *G2 = new GlobalVariable(*M, IntTy, false,
314 GlobalValue::ExternalLinkage, nullptr);
315 ASSERT_NE(G1, G2);
316
317 Constant *Int1 = ConstantExpr::getPtrToInt(G1, IntTy);
318 Constant *Int2 = ConstantExpr::getPtrToInt(G2, IntTy);
319 ASSERT_NE(Int1, Int2);
320
321 GlobalVariable *Ref =
322 new GlobalVariable(*M, IntTy, false, GlobalValue::ExternalLinkage, Int1);
323 ASSERT_EQ(Int1, Ref->getInitializer());
324
325 G1->replaceAllUsesWith(G2);
326 ASSERT_EQ(Int2, Ref->getInitializer());
327 }
328
TEST(ConstantsTest,GEPReplaceWithConstant)329 TEST(ConstantsTest, GEPReplaceWithConstant) {
330 LLVMContext Context;
331 std::unique_ptr<Module> M(new Module("MyModule", Context));
332
333 Type *IntTy = Type::getInt32Ty(Context);
334 Type *PtrTy = PointerType::get(IntTy, 0);
335 auto *C1 = ConstantInt::get(IntTy, 1);
336 auto *Placeholder = new GlobalVariable(
337 *M, IntTy, false, GlobalValue::ExternalWeakLinkage, nullptr);
338 auto *GEP = ConstantExpr::getGetElementPtr(IntTy, Placeholder, C1);
339 ASSERT_EQ(GEP->getOperand(0), Placeholder);
340
341 auto *Ref =
342 new GlobalVariable(*M, PtrTy, false, GlobalValue::ExternalLinkage, GEP);
343 ASSERT_EQ(GEP, Ref->getInitializer());
344
345 auto *Global = new GlobalVariable(*M, PtrTy, false,
346 GlobalValue::ExternalLinkage, nullptr);
347 auto *Alias = GlobalAlias::create(IntTy, 0, GlobalValue::ExternalLinkage,
348 "alias", Global, M.get());
349 Placeholder->replaceAllUsesWith(Alias);
350 ASSERT_EQ(GEP, Ref->getInitializer());
351 ASSERT_EQ(GEP->getOperand(0), Alias);
352 }
353
TEST(ConstantsTest,AliasCAPI)354 TEST(ConstantsTest, AliasCAPI) {
355 LLVMContext Context;
356 SMDiagnostic Error;
357 std::unique_ptr<Module> M =
358 parseAssemblyString("@g = global i32 42", Error, Context);
359 GlobalVariable *G = M->getGlobalVariable("g");
360 Type *I16Ty = Type::getInt16Ty(Context);
361 Type *I16PTy = PointerType::get(I16Ty, 0);
362 Constant *Aliasee = ConstantExpr::getBitCast(G, I16PTy);
363 LLVMValueRef AliasRef =
364 LLVMAddAlias(wrap(M.get()), wrap(I16PTy), wrap(Aliasee), "a");
365 ASSERT_EQ(unwrap<GlobalAlias>(AliasRef)->getAliasee(), Aliasee);
366 }
367
368 } // end anonymous namespace
369 } // end namespace llvm
370