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fc775b1e49
Summary: Fix a corner case in `MDNode::getMostGenericTBAA` where we can sometimes generate invalid TBAA metadata. Reviewers: chandlerc, hfinkel, mehdi_amini, manmanren Subscribers: mcrosier, llvm-commits Differential Revision: https://reviews.llvm.org/D26635 llvm-svn: 289403
92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
//===--- TBAATest.cpp - Mixed TBAA unit tests -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/AliasAnalysisEvaluator.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/MDBuilder.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Support/CommandLine.h"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace {
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class TBAATest : public testing::Test {
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protected:
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TBAATest() : M("TBAATest", C), MD(C) {}
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LLVMContext C;
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Module M;
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MDBuilder MD;
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};
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static StoreInst *getFunctionWithSingleStore(Module *M, StringRef Name) {
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auto &C = M->getContext();
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), {});
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auto *F = cast<Function>(M->getOrInsertFunction(Name, FTy));
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auto *BB = BasicBlock::Create(C, "entry", F);
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auto *IntType = Type::getInt32Ty(C);
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auto *PtrType = Type::getInt32PtrTy(C);
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auto *SI = new StoreInst(ConstantInt::get(IntType, 42),
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ConstantPointerNull::get(PtrType), BB);
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ReturnInst::Create(C, nullptr, BB);
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return SI;
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}
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TEST_F(TBAATest, checkVerifierBehaviorForOldTBAA) {
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auto *SI = getFunctionWithSingleStore(&M, "f1");
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auto *F = SI->getFunction();
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// C++ unit test case to avoid going through the auto upgrade logic.
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auto *RootMD = MD.createTBAARoot("Simple C/C++ TBAA");
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auto *MD1 = MD.createTBAANode("omnipotent char", RootMD);
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auto *MD2 = MD.createTBAANode("int", MD1);
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SI->setMetadata(LLVMContext::MD_tbaa, MD2);
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SmallVector<char, 0> ErrorMsg;
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raw_svector_ostream Outs(ErrorMsg);
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StringRef ExpectedFailureMsg(
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"Old-style TBAA is no longer allowed, use struct-path TBAA instead");
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EXPECT_TRUE(verifyFunction(*F, &Outs));
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EXPECT_TRUE(StringRef(ErrorMsg.begin(), ErrorMsg.size())
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.startswith(ExpectedFailureMsg));
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}
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TEST_F(TBAATest, checkTBAAMerging) {
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auto *SI = getFunctionWithSingleStore(&M, "f2");
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auto *F = SI->getFunction();
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auto *RootMD = MD.createTBAARoot("tbaa-root");
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auto *MD1 = MD.createTBAANode("scalar-a", RootMD);
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auto *StructTag1 = MD.createTBAAStructTagNode(MD1, MD1, 0);
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auto *MD2 = MD.createTBAANode("scalar-b", RootMD);
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auto *StructTag2 = MD.createTBAAStructTagNode(MD2, MD2, 0);
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auto *GenericMD = MDNode::getMostGenericTBAA(StructTag1, StructTag2);
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EXPECT_EQ(GenericMD, nullptr);
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// Despite GenericMD being nullptr, we expect the setMetadata call to be well
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// defined and produce a well-formed function.
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SI->setMetadata(LLVMContext::MD_tbaa, GenericMD);
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EXPECT_TRUE(!verifyFunction(*F));
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}
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} // end anonymous namspace
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} // end llvm namespace
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