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llvm-project/llvm/unittests/IR/ConstantsTest.cpp

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//===- llvm/unittest/IR/ConstantsTest.cpp - Constants unit tests ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Constants.h"
#include "llvm-c/Core.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
namespace llvm {
namespace {
TEST(ConstantsTest, Integer_i1) {
LLVMContext Context;
IntegerType *Int1 = IntegerType::get(Context, 1);
Constant* One = ConstantInt::get(Int1, 1, true);
Constant* Zero = ConstantInt::get(Int1, 0);
Constant* NegOne = ConstantInt::get(Int1, static_cast<uint64_t>(-1), true);
EXPECT_EQ(NegOne, ConstantInt::getSigned(Int1, -1));
Constant* Undef = UndefValue::get(Int1);
// Input: @b = constant i1 add(i1 1 , i1 1)
// Output: @b = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getAdd(One, One));
// @c = constant i1 add(i1 -1, i1 1)
// @c = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, One));
// @d = constant i1 add(i1 -1, i1 -1)
// @d = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getAdd(NegOne, NegOne));
// @e = constant i1 sub(i1 -1, i1 1)
// @e = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getSub(NegOne, One));
// @f = constant i1 sub(i1 1 , i1 -1)
// @f = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getSub(One, NegOne));
// @g = constant i1 sub(i1 1 , i1 1)
// @g = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getSub(One, One));
// @h = constant i1 shl(i1 1 , i1 1) ; undefined
// @h = constant i1 undef
EXPECT_EQ(Undef, ConstantExpr::getShl(One, One));
// @i = constant i1 shl(i1 1 , i1 0)
// @i = constant i1 true
EXPECT_EQ(One, ConstantExpr::getShl(One, Zero));
// @j = constant i1 lshr(i1 1, i1 1) ; undefined
// @j = constant i1 undef
EXPECT_EQ(Undef, ConstantExpr::getLShr(One, One));
// @m = constant i1 ashr(i1 1, i1 1) ; undefined
// @m = constant i1 undef
EXPECT_EQ(Undef, ConstantExpr::getAShr(One, One));
// @n = constant i1 mul(i1 -1, i1 1)
// @n = constant i1 true
EXPECT_EQ(One, ConstantExpr::getMul(NegOne, One));
// @o = constant i1 sdiv(i1 -1, i1 1) ; overflow
// @o = constant i1 true
EXPECT_EQ(One, ConstantExpr::getSDiv(NegOne, One));
// @p = constant i1 sdiv(i1 1 , i1 -1); overflow
// @p = constant i1 true
EXPECT_EQ(One, ConstantExpr::getSDiv(One, NegOne));
// @q = constant i1 udiv(i1 -1, i1 1)
// @q = constant i1 true
EXPECT_EQ(One, ConstantExpr::getUDiv(NegOne, One));
// @r = constant i1 udiv(i1 1, i1 -1)
// @r = constant i1 true
EXPECT_EQ(One, ConstantExpr::getUDiv(One, NegOne));
// @s = constant i1 srem(i1 -1, i1 1) ; overflow
// @s = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getSRem(NegOne, One));
// @t = constant i1 urem(i1 -1, i1 1)
// @t = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getURem(NegOne, One));
// @u = constant i1 srem(i1 1, i1 -1) ; overflow
// @u = constant i1 false
EXPECT_EQ(Zero, ConstantExpr::getSRem(One, NegOne));
}
TEST(ConstantsTest, IntSigns) {
LLVMContext Context;
IntegerType *Int8Ty = Type::getInt8Ty(Context);
EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, false)->getSExtValue());
EXPECT_EQ(100, ConstantInt::get(Int8Ty, 100, true)->getSExtValue());
EXPECT_EQ(100, ConstantInt::getSigned(Int8Ty, 100)->getSExtValue());
EXPECT_EQ(-50, ConstantInt::get(Int8Ty, 206)->getSExtValue());
EXPECT_EQ(-50, ConstantInt::getSigned(Int8Ty, -50)->getSExtValue());
EXPECT_EQ(206U, ConstantInt::getSigned(Int8Ty, -50)->getZExtValue());
// Overflow is handled by truncation.
EXPECT_EQ(0x3b, ConstantInt::get(Int8Ty, 0x13b)->getSExtValue());
}
TEST(ConstantsTest, FP128Test) {
LLVMContext Context;
Type *FP128Ty = Type::getFP128Ty(Context);
IntegerType *Int128Ty = Type::getIntNTy(Context, 128);
Constant *Zero128 = Constant::getNullValue(Int128Ty);
Constant *X = ConstantExpr::getUIToFP(Zero128, FP128Ty);
EXPECT_TRUE(isa<ConstantFP>(X));
}
TEST(ConstantsTest, PointerCast) {
LLVMContext C;
Type *Int8PtrTy = Type::getInt8PtrTy(C);
Type *Int32PtrTy = Type::getInt32PtrTy(C);
Type *Int64Ty = Type::getInt64Ty(C);
VectorType *Int8PtrVecTy = VectorType::get(Int8PtrTy, 4);
VectorType *Int32PtrVecTy = VectorType::get(Int32PtrTy, 4);
VectorType *Int64VecTy = VectorType::get(Int64Ty, 4);
// ptrtoint i8* to i64
EXPECT_EQ(Constant::getNullValue(Int64Ty),
ConstantExpr::getPointerCast(
Constant::getNullValue(Int8PtrTy), Int64Ty));
// bitcast i8* to i32*
EXPECT_EQ(Constant::getNullValue(Int32PtrTy),
ConstantExpr::getPointerCast(
Constant::getNullValue(Int8PtrTy), Int32PtrTy));
// ptrtoint <4 x i8*> to <4 x i64>
EXPECT_EQ(Constant::getNullValue(Int64VecTy),
ConstantExpr::getPointerCast(
Constant::getNullValue(Int8PtrVecTy), Int64VecTy));
// bitcast <4 x i8*> to <4 x i32*>
EXPECT_EQ(Constant::getNullValue(Int32PtrVecTy),
ConstantExpr::getPointerCast(
Constant::getNullValue(Int8PtrVecTy), Int32PtrVecTy));
Type *Int32Ptr1Ty = Type::getInt32PtrTy(C, 1);
ConstantInt *K = ConstantInt::get(Type::getInt64Ty(C), 1234);
// Make sure that addrspacecast of inttoptr is not folded away.
EXPECT_NE(K,
ConstantExpr::getAddrSpaceCast(
ConstantExpr::getIntToPtr(K, Int32PtrTy), Int32Ptr1Ty));
EXPECT_NE(K,
ConstantExpr::getAddrSpaceCast(
ConstantExpr::getIntToPtr(K, Int32Ptr1Ty), Int32PtrTy));
Constant *NullInt32Ptr0 = Constant::getNullValue(Int32PtrTy);
Constant *NullInt32Ptr1 = Constant::getNullValue(Int32Ptr1Ty);
// Make sure that addrspacecast of null is not folded away.
EXPECT_NE(Constant::getNullValue(Int32PtrTy),
ConstantExpr::getAddrSpaceCast(NullInt32Ptr0, Int32Ptr1Ty));
EXPECT_NE(Constant::getNullValue(Int32Ptr1Ty),
ConstantExpr::getAddrSpaceCast(NullInt32Ptr1, Int32PtrTy));
}
#define CHECK(x, y) \
{ \
std::string __s; \
raw_string_ostream __o(__s); \
Instruction *__I = cast<ConstantExpr>(x)->getAsInstruction(); \
__I->print(__o); \
__I->deleteValue(); \
__o.flush(); \
EXPECT_EQ(std::string(" <badref> = " y), __s); \
}
TEST(ConstantsTest, AsInstructionsTest) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
Type *Int64Ty = Type::getInt64Ty(Context);
Type *Int32Ty = Type::getInt32Ty(Context);
Type *Int16Ty = Type::getInt16Ty(Context);
Type *Int1Ty = Type::getInt1Ty(Context);
Type *FloatTy = Type::getFloatTy(Context);
Type *DoubleTy = Type::getDoubleTy(Context);
Constant *Global = M->getOrInsertGlobal("dummy",
PointerType::getUnqual(Int32Ty));
Constant *Global2 = M->getOrInsertGlobal("dummy2",
PointerType::getUnqual(Int32Ty));
Constant *P0 = ConstantExpr::getPtrToInt(Global, Int32Ty);
Constant *P1 = ConstantExpr::getUIToFP(P0, FloatTy);
Constant *P2 = ConstantExpr::getUIToFP(P0, DoubleTy);
Constant *P3 = ConstantExpr::getTrunc(P0, Int1Ty);
Constant *P4 = ConstantExpr::getPtrToInt(Global2, Int32Ty);
Constant *P5 = ConstantExpr::getUIToFP(P4, FloatTy);
Constant *P6 = ConstantExpr::getBitCast(P4, VectorType::get(Int16Ty, 2));
Constant *One = ConstantInt::get(Int32Ty, 1);
Constant *Two = ConstantInt::get(Int64Ty, 2);
Constant *Big = ConstantInt::get(Context, APInt{256, uint64_t(-1), true});
Constant *Elt = ConstantInt::get(Int16Ty, 2015);
Constant *Undef16 = UndefValue::get(Int16Ty);
Constant *Undef64 = UndefValue::get(Int64Ty);
Constant *UndefV16 = UndefValue::get(P6->getType());
#define P0STR "ptrtoint (i32** @dummy to i32)"
#define P1STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to float)"
#define P2STR "uitofp (i32 ptrtoint (i32** @dummy to i32) to double)"
#define P3STR "ptrtoint (i32** @dummy to i1)"
#define P4STR "ptrtoint (i32** @dummy2 to i32)"
#define P5STR "uitofp (i32 ptrtoint (i32** @dummy2 to i32) to float)"
#define P6STR "bitcast (i32 ptrtoint (i32** @dummy2 to i32) to <2 x i16>)"
CHECK(ConstantExpr::getNeg(P0), "sub i32 0, " P0STR);
CHECK(ConstantExpr::getFNeg(P1), "fsub float -0.000000e+00, " P1STR);
CHECK(ConstantExpr::getNot(P0), "xor i32 " P0STR ", -1");
CHECK(ConstantExpr::getAdd(P0, P0), "add i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getAdd(P0, P0, false, true), "add nsw i32 " P0STR ", "
P0STR);
CHECK(ConstantExpr::getAdd(P0, P0, true, true), "add nuw nsw i32 " P0STR ", "
P0STR);
CHECK(ConstantExpr::getFAdd(P1, P1), "fadd float " P1STR ", " P1STR);
CHECK(ConstantExpr::getSub(P0, P0), "sub i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getFSub(P1, P1), "fsub float " P1STR ", " P1STR);
CHECK(ConstantExpr::getMul(P0, P0), "mul i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getFMul(P1, P1), "fmul float " P1STR ", " P1STR);
CHECK(ConstantExpr::getUDiv(P0, P0), "udiv i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getSDiv(P0, P0), "sdiv i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getFDiv(P1, P1), "fdiv float " P1STR ", " P1STR);
CHECK(ConstantExpr::getURem(P0, P0), "urem i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getSRem(P0, P0), "srem i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getFRem(P1, P1), "frem float " P1STR ", " P1STR);
CHECK(ConstantExpr::getAnd(P0, P0), "and i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getOr(P0, P0), "or i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getXor(P0, P0), "xor i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getShl(P0, P0), "shl i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getShl(P0, P0, true), "shl nuw i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getShl(P0, P0, false, true), "shl nsw i32 " P0STR ", "
P0STR);
CHECK(ConstantExpr::getLShr(P0, P0, false), "lshr i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getLShr(P0, P0, true), "lshr exact i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getAShr(P0, P0, false), "ashr i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getAShr(P0, P0, true), "ashr exact i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getSExt(P0, Int64Ty), "sext i32 " P0STR " to i64");
CHECK(ConstantExpr::getZExt(P0, Int64Ty), "zext i32 " P0STR " to i64");
CHECK(ConstantExpr::getFPTrunc(P2, FloatTy), "fptrunc double " P2STR
" to float");
CHECK(ConstantExpr::getFPExtend(P1, DoubleTy), "fpext float " P1STR
" to double");
CHECK(ConstantExpr::getExactUDiv(P0, P0), "udiv exact i32 " P0STR ", " P0STR);
CHECK(ConstantExpr::getSelect(P3, P0, P4), "select i1 " P3STR ", i32 " P0STR
", i32 " P4STR);
CHECK(ConstantExpr::getICmp(CmpInst::ICMP_EQ, P0, P4), "icmp eq i32 " P0STR
", " P4STR);
CHECK(ConstantExpr::getFCmp(CmpInst::FCMP_ULT, P1, P5), "fcmp ult float "
P1STR ", " P5STR);
std::vector<Constant*> V;
V.push_back(One);
// FIXME: getGetElementPtr() actually creates an inbounds ConstantGEP,
// not a normal one!
//CHECK(ConstantExpr::getGetElementPtr(Global, V, false),
// "getelementptr i32*, i32** @dummy, i32 1");
CHECK(ConstantExpr::getInBoundsGetElementPtr(PointerType::getUnqual(Int32Ty),
Global, V),
"getelementptr inbounds i32*, i32** @dummy, i32 1");
CHECK(ConstantExpr::getExtractElement(P6, One), "extractelement <2 x i16> "
P6STR ", i32 1");
EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Two));
EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Big));
EXPECT_EQ(Undef16, ConstantExpr::getExtractElement(P6, Undef64));
EXPECT_EQ(Elt, ConstantExpr::getExtractElement(
ConstantExpr::getInsertElement(P6, Elt, One), One));
EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Two));
EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Big));
EXPECT_EQ(UndefV16, ConstantExpr::getInsertElement(P6, Elt, Undef64));
}
#ifdef GTEST_HAS_DEATH_TEST
#ifndef NDEBUG
TEST(ConstantsTest, ReplaceWithConstantTest) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
Type *Int32Ty = Type::getInt32Ty(Context);
Constant *One = ConstantInt::get(Int32Ty, 1);
Constant *Global =
M->getOrInsertGlobal("dummy", PointerType::getUnqual(Int32Ty));
Constant *GEP = ConstantExpr::getGetElementPtr(
PointerType::getUnqual(Int32Ty), Global, One);
EXPECT_DEATH(Global->replaceAllUsesWith(GEP),
"this->replaceAllUsesWith\\(expr\\(this\\)\\) is NOT valid!");
}
#endif
#endif
#undef CHECK
TEST(ConstantsTest, ConstantArrayReplaceWithConstant) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
Type *IntTy = Type::getInt8Ty(Context);
ArrayType *ArrayTy = ArrayType::get(IntTy, 2);
Constant *A01Vals[2] = {ConstantInt::get(IntTy, 0),
ConstantInt::get(IntTy, 1)};
Constant *A01 = ConstantArray::get(ArrayTy, A01Vals);
Constant *Global = new GlobalVariable(*M, IntTy, false,
GlobalValue::ExternalLinkage, nullptr);
Constant *GlobalInt = ConstantExpr::getPtrToInt(Global, IntTy);
Constant *A0GVals[2] = {ConstantInt::get(IntTy, 0), GlobalInt};
Constant *A0G = ConstantArray::get(ArrayTy, A0GVals);
ASSERT_NE(A01, A0G);
GlobalVariable *RefArray =
new GlobalVariable(*M, ArrayTy, false, GlobalValue::ExternalLinkage, A0G);
ASSERT_EQ(A0G, RefArray->getInitializer());
GlobalInt->replaceAllUsesWith(ConstantInt::get(IntTy, 1));
ASSERT_EQ(A01, RefArray->getInitializer());
}
TEST(ConstantsTest, ConstantExprReplaceWithConstant) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
Type *IntTy = Type::getInt8Ty(Context);
Constant *G1 = new GlobalVariable(*M, IntTy, false,
GlobalValue::ExternalLinkage, nullptr);
Constant *G2 = new GlobalVariable(*M, IntTy, false,
GlobalValue::ExternalLinkage, nullptr);
ASSERT_NE(G1, G2);
Constant *Int1 = ConstantExpr::getPtrToInt(G1, IntTy);
Constant *Int2 = ConstantExpr::getPtrToInt(G2, IntTy);
ASSERT_NE(Int1, Int2);
GlobalVariable *Ref =
new GlobalVariable(*M, IntTy, false, GlobalValue::ExternalLinkage, Int1);
ASSERT_EQ(Int1, Ref->getInitializer());
G1->replaceAllUsesWith(G2);
ASSERT_EQ(Int2, Ref->getInitializer());
}
TEST(ConstantsTest, GEPReplaceWithConstant) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
Type *IntTy = Type::getInt32Ty(Context);
Type *PtrTy = PointerType::get(IntTy, 0);
auto *C1 = ConstantInt::get(IntTy, 1);
auto *Placeholder = new GlobalVariable(
*M, IntTy, false, GlobalValue::ExternalWeakLinkage, nullptr);
auto *GEP = ConstantExpr::getGetElementPtr(IntTy, Placeholder, C1);
ASSERT_EQ(GEP->getOperand(0), Placeholder);
auto *Ref =
new GlobalVariable(*M, PtrTy, false, GlobalValue::ExternalLinkage, GEP);
ASSERT_EQ(GEP, Ref->getInitializer());
auto *Global = new GlobalVariable(*M, PtrTy, false,
GlobalValue::ExternalLinkage, nullptr);
auto *Alias = GlobalAlias::create(IntTy, 0, GlobalValue::ExternalLinkage,
"alias", Global, M.get());
Placeholder->replaceAllUsesWith(Alias);
ASSERT_EQ(GEP, Ref->getInitializer());
ASSERT_EQ(GEP->getOperand(0), Alias);
}
TEST(ConstantsTest, AliasCAPI) {
LLVMContext Context;
SMDiagnostic Error;
std::unique_ptr<Module> M =
parseAssemblyString("@g = global i32 42", Error, Context);
GlobalVariable *G = M->getGlobalVariable("g");
Type *I16Ty = Type::getInt16Ty(Context);
Type *I16PTy = PointerType::get(I16Ty, 0);
Constant *Aliasee = ConstantExpr::getBitCast(G, I16PTy);
LLVMValueRef AliasRef =
LLVMAddAlias(wrap(M.get()), wrap(I16PTy), wrap(Aliasee), "a");
ASSERT_EQ(unwrap<GlobalAlias>(AliasRef)->getAliasee(), Aliasee);
}
static std::string getNameOfType(Type *T) {
std::string S;
raw_string_ostream RSOS(S);
T->print(RSOS);
return S;
}
TEST(ConstantsTest, BuildConstantDataArrays) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
ArrayType *ArrayTy = ArrayType::get(T, 2);
Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
Constant *CDV = ConstantArray::get(ArrayTy, Vals);
ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
<< " T = " << getNameOfType(T);
}
for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
Type::getDoubleTy(Context)}) {
ArrayType *ArrayTy = ArrayType::get(T, 2);
Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
Constant *CDV = ConstantArray::get(ArrayTy, Vals);
ASSERT_TRUE(dyn_cast<ConstantDataArray>(CDV) != nullptr)
<< " T = " << getNameOfType(T);
}
}
TEST(ConstantsTest, BuildConstantDataVectors) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
for (Type *T : {Type::getInt8Ty(Context), Type::getInt16Ty(Context),
Type::getInt32Ty(Context), Type::getInt64Ty(Context)}) {
Constant *Vals[] = {ConstantInt::get(T, 0), ConstantInt::get(T, 1)};
Constant *CDV = ConstantVector::get(Vals);
ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
<< " T = " << getNameOfType(T);
}
for (Type *T : {Type::getHalfTy(Context), Type::getFloatTy(Context),
Type::getDoubleTy(Context)}) {
Constant *Vals[] = {ConstantFP::get(T, 0), ConstantFP::get(T, 1)};
Constant *CDV = ConstantVector::get(Vals);
ASSERT_TRUE(dyn_cast<ConstantDataVector>(CDV) != nullptr)
<< " T = " << getNameOfType(T);
}
}
TEST(ConstantsTest, BitcastToGEP) {
LLVMContext Context;
std::unique_ptr<Module> M(new Module("MyModule", Context));
auto *i32 = Type::getInt32Ty(Context);
auto *U = StructType::create(Context, "Unsized");
Type *EltTys[] = {i32, U};
auto *S = StructType::create(EltTys);
auto *G = new GlobalVariable(*M, S, false,
GlobalValue::ExternalLinkage, nullptr);
auto *PtrTy = PointerType::get(i32, 0);
auto *C = ConstantExpr::getBitCast(G, PtrTy);
ASSERT_EQ(cast<ConstantExpr>(C)->getOpcode(), Instruction::BitCast);
}
} // end anonymous namespace
} // end namespace llvm
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