TBAATest.cpp
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//===--- TBAATest.cpp - Mixed TBAA 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/Analysis/AliasAnalysisEvaluator.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/CommandLine.h"
#include "gtest/gtest.h"
namespace llvm {
namespace {
class TBAATest : public testing::Test {
protected:
TBAATest() : M("TBAATest", C), MD(C) {}
LLVMContext C;
Module M;
MDBuilder MD;
};
static StoreInst *getFunctionWithSingleStore(Module *M, StringRef Name) {
auto &C = M->getContext();
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), {});
auto *F = Function::Create(FTy, Function::ExternalLinkage, Name, M);
auto *BB = BasicBlock::Create(C, "entry", F);
auto *IntType = Type::getInt32Ty(C);
auto *PtrType = Type::getInt32PtrTy(C);
auto *SI = new StoreInst(ConstantInt::get(IntType, 42),
ConstantPointerNull::get(PtrType), BB);
ReturnInst::Create(C, nullptr, BB);
return SI;
}
TEST_F(TBAATest, checkVerifierBehaviorForOldTBAA) {
auto *SI = getFunctionWithSingleStore(&M, "f1");
auto *F = SI->getFunction();
// C++ unit test case to avoid going through the auto upgrade logic.
auto *RootMD = MD.createTBAARoot("Simple C/C++ TBAA");
auto *MD1 = MD.createTBAANode("omnipotent char", RootMD);
auto *MD2 = MD.createTBAANode("int", MD1);
SI->setMetadata(LLVMContext::MD_tbaa, MD2);
SmallVector<char, 0> ErrorMsg;
raw_svector_ostream Outs(ErrorMsg);
StringRef ExpectedFailureMsg(
"Old-style TBAA is no longer allowed, use struct-path TBAA instead");
EXPECT_TRUE(verifyFunction(*F, &Outs));
EXPECT_TRUE(StringRef(ErrorMsg.begin(), ErrorMsg.size())
.startswith(ExpectedFailureMsg));
}
TEST_F(TBAATest, checkTBAAMerging) {
auto *SI = getFunctionWithSingleStore(&M, "f2");
auto *F = SI->getFunction();
auto *RootMD = MD.createTBAARoot("tbaa-root");
auto *MD1 = MD.createTBAANode("scalar-a", RootMD);
auto *StructTag1 = MD.createTBAAStructTagNode(MD1, MD1, 0);
auto *MD2 = MD.createTBAANode("scalar-b", RootMD);
auto *StructTag2 = MD.createTBAAStructTagNode(MD2, MD2, 0);
auto *GenericMD = MDNode::getMostGenericTBAA(StructTag1, StructTag2);
EXPECT_EQ(GenericMD, nullptr);
// Despite GenericMD being nullptr, we expect the setMetadata call to be well
// defined and produce a well-formed function.
SI->setMetadata(LLVMContext::MD_tbaa, GenericMD);
EXPECT_TRUE(!verifyFunction(*F));
}
} // end anonymous namspace
} // end llvm namespace