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

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//===- llvm/unittest/IR/VerifierTest.cpp - Verifier unit tests --*- C++ -*-===//
//
// 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/Verifier.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "gtest/gtest.h"
namespace llvm {
namespace {
TEST(VerifierTest, Branch_i1) {
LLVMContext C;
Module M("M", C);
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", M);
BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
BasicBlock *Exit = BasicBlock::Create(C, "exit", F);
ReturnInst::Create(C, Exit);
// To avoid triggering an assertion in BranchInst::Create, we first create
// a branch with an 'i1' condition ...
Constant *False = ConstantInt::getFalse(C);
BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);
// ... then use setOperand to redirect it to a value of different type.
Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
BI->setOperand(0, Zero32);
EXPECT_TRUE(verifyFunction(*F));
}
TEST(VerifierTest, Freeze) {
LLVMContext C;
Module M("M", C);
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", M);
BasicBlock *Entry = BasicBlock::Create(C, "entry", F);
ReturnInst *RI = ReturnInst::Create(C, Entry);
IntegerType *ITy = IntegerType::get(C, 32);
ConstantInt *CI = ConstantInt::get(ITy, 0);
// Valid type : freeze(<2 x i32>)
Constant *CV = ConstantVector::getSplat({2, false}, CI);
FreezeInst *FI_vec = new FreezeInst(CV);
FI_vec->insertBefore(RI);
EXPECT_FALSE(verifyFunction(*F));
FI_vec->eraseFromParent();
// Valid type : freeze(float)
Constant *CFP = ConstantFP::get(Type::getDoubleTy(C), 0.0);
FreezeInst *FI_dbl = new FreezeInst(CFP);
FI_dbl->insertBefore(RI);
EXPECT_FALSE(verifyFunction(*F));
FI_dbl->eraseFromParent();
// Valid type : freeze(i32*)
PointerType *PT = PointerType::get(ITy, 0);
ConstantPointerNull *CPN = ConstantPointerNull::get(PT);
FreezeInst *FI_ptr = new FreezeInst(CPN);
FI_ptr->insertBefore(RI);
EXPECT_FALSE(verifyFunction(*F));
FI_ptr->eraseFromParent();
// Valid type : freeze(int)
FreezeInst *FI = new FreezeInst(CI);
FI->insertBefore(RI);
EXPECT_FALSE(verifyFunction(*F));
FI->eraseFromParent();
}
TEST(VerifierTest, InvalidRetAttribute) {
LLVMContext C;
Module M("M", C);
FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", M);
AttributeList AS = F->getAttributes();
F->setAttributes(
AS.addAttribute(C, AttributeList::ReturnIndex, Attribute::UWTable));
std::string Error;
raw_string_ostream ErrorOS(Error);
EXPECT_TRUE(verifyModule(M, &ErrorOS));
EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
"Attribute 'uwtable' only applies to functions!"));
}
TEST(VerifierTest, CrossModuleRef) {
LLVMContext C;
Module M1("M1", C);
Module M2("M2", C);
Module M3("M3", C);
FunctionType *FTy = FunctionType::get(Type::getInt32Ty(C), /*isVarArg=*/false);
Function *F1 = Function::Create(FTy, Function::ExternalLinkage, "foo1", M1);
Function *F2 = Function::Create(FTy, Function::ExternalLinkage, "foo2", M2);
Function *F3 = Function::Create(FTy, Function::ExternalLinkage, "foo3", M3);
BasicBlock *Entry1 = BasicBlock::Create(C, "entry", F1);
BasicBlock *Entry3 = BasicBlock::Create(C, "entry", F3);
// BAD: Referencing function in another module
CallInst::Create(F2,"call",Entry1);
// BAD: Referencing personality routine in another module
F3->setPersonalityFn(F2);
// Fill in the body
Constant *ConstZero = ConstantInt::get(Type::getInt32Ty(C), 0);
ReturnInst::Create(C, ConstZero, Entry1);
ReturnInst::Create(C, ConstZero, Entry3);
std::string Error;
raw_string_ostream ErrorOS(Error);
EXPECT_TRUE(verifyModule(M2, &ErrorOS));
EXPECT_TRUE(StringRef(ErrorOS.str())
.equals("Global is used by function in a different module\n"
"i32 ()* @foo2\n"
"; ModuleID = 'M2'\n"
"i32 ()* @foo3\n"
"; ModuleID = 'M3'\n"
"Global is referenced in a different module!\n"
"i32 ()* @foo2\n"
"; ModuleID = 'M2'\n"
" %call = call i32 @foo2()\n"
"i32 ()* @foo1\n"
"; ModuleID = 'M1'\n"));
Error.clear();
EXPECT_TRUE(verifyModule(M1, &ErrorOS));
EXPECT_TRUE(StringRef(ErrorOS.str()).equals(
"Referencing function in another module!\n"
" %call = call i32 @foo2()\n"
"; ModuleID = 'M1'\n"
"i32 ()* @foo2\n"
"; ModuleID = 'M2'\n"));
Error.clear();
EXPECT_TRUE(verifyModule(M3, &ErrorOS));
EXPECT_TRUE(StringRef(ErrorOS.str()).startswith(
"Referencing personality function in another module!"));
// Erase bad methods to avoid triggering an assertion failure on destruction
F1->eraseFromParent();
F3->eraseFromParent();
}
TEST(VerifierTest, InvalidVariableLinkage) {
LLVMContext C;
Module M("M", C);
new GlobalVariable(M, Type::getInt8Ty(C), false,
GlobalValue::LinkOnceODRLinkage, nullptr, "Some Global");
std::string Error;
raw_string_ostream ErrorOS(Error);
EXPECT_TRUE(verifyModule(M, &ErrorOS));
EXPECT_TRUE(
StringRef(ErrorOS.str()).startswith("Global is external, but doesn't "
"have external or weak linkage!"));
}
TEST(VerifierTest, InvalidFunctionLinkage) {
LLVMContext C;
Module M("M", C);
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
Function::Create(FTy, GlobalValue::LinkOnceODRLinkage, "foo", &M);
std::string Error;
raw_string_ostream ErrorOS(Error);
EXPECT_TRUE(verifyModule(M, &ErrorOS));
EXPECT_TRUE(
StringRef(ErrorOS.str()).startswith("Global is external, but doesn't "
"have external or weak linkage!"));
}
TEST(VerifierTest, DetectInvalidDebugInfo) {
{
LLVMContext C;
Module M("M", C);
DIBuilder DIB(M);
DIB.createCompileUnit(dwarf::DW_LANG_C89, DIB.createFile("broken.c", "/"),
"unittest", false, "", 0);
DIB.finalize();
EXPECT_FALSE(verifyModule(M));
// Now break it by inserting non-CU node to the list of CUs.
auto *File = DIB.createFile("not-a-CU.f", ".");
NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.cu");
NMD->addOperand(File);
EXPECT_TRUE(verifyModule(M));
}
{
LLVMContext C;
Module M("M", C);
DIBuilder DIB(M);
auto *CU = DIB.createCompileUnit(dwarf::DW_LANG_C89,
DIB.createFile("broken.c", "/"),
"unittest", false, "", 0);
new GlobalVariable(M, Type::getInt8Ty(C), false,
GlobalValue::ExternalLinkage, nullptr, "g");
auto *F = Function::Create(FunctionType::get(Type::getVoidTy(C), false),
Function::ExternalLinkage, "f", M);
IRBuilder<> Builder(BasicBlock::Create(C, "", F));
Builder.CreateUnreachable();
F->setSubprogram(DIB.createFunction(
CU, "f", "f", DIB.createFile("broken.c", "/"), 1, nullptr, 1,
DINode::FlagZero,
DISubprogram::SPFlagLocalToUnit | DISubprogram::SPFlagDefinition));
DIB.finalize();
EXPECT_FALSE(verifyModule(M));
// Now break it by not listing the CU at all.
M.eraseNamedMetadata(M.getOrInsertNamedMetadata("llvm.dbg.cu"));
EXPECT_TRUE(verifyModule(M));
}
}
} // end anonymous namespace
} // end namespace llvm
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