253 lines
8.2 KiB
C++
253 lines
8.2 KiB
C++
//===--- AliasAnalysisTest.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/AliasAnalysis.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/Analysis/AssumptionCache.h"
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#include "llvm/Analysis/BasicAliasAnalysis.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/InstIterator.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/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/SourceMgr.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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// Set up some test passes.
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namespace llvm {
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void initializeAATestPassPass(PassRegistry&);
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void initializeTestCustomAAWrapperPassPass(PassRegistry&);
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}
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namespace {
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struct AATestPass : FunctionPass {
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static char ID;
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AATestPass() : FunctionPass(ID) {
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initializeAATestPassPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AAResultsWrapperPass>();
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AU.setPreservesAll();
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}
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bool runOnFunction(Function &F) override {
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AliasAnalysis &AA = getAnalysis<AAResultsWrapperPass>().getAAResults();
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SetVector<Value *> Pointers;
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for (Argument &A : F.args())
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if (A.getType()->isPointerTy())
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Pointers.insert(&A);
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for (Instruction &I : instructions(F))
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if (I.getType()->isPointerTy())
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Pointers.insert(&I);
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for (Value *P1 : Pointers)
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for (Value *P2 : Pointers)
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(void)AA.alias(P1, MemoryLocation::UnknownSize, P2,
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MemoryLocation::UnknownSize);
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return false;
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}
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};
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}
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char AATestPass::ID = 0;
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INITIALIZE_PASS_BEGIN(AATestPass, "aa-test-pas", "Alias Analysis Test Pass",
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false, true)
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INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
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INITIALIZE_PASS_END(AATestPass, "aa-test-pass", "Alias Analysis Test Pass",
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false, true)
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namespace {
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/// A test customizable AA result. It merely accepts a callback to run whenever
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/// it receives an alias query. Useful for testing that a particular AA result
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/// is reached.
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struct TestCustomAAResult : AAResultBase<TestCustomAAResult> {
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friend AAResultBase<TestCustomAAResult>;
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std::function<void()> CB;
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explicit TestCustomAAResult(std::function<void()> CB)
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: AAResultBase(), CB(std::move(CB)) {}
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TestCustomAAResult(TestCustomAAResult &&Arg)
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: AAResultBase(std::move(Arg)), CB(std::move(Arg.CB)) {}
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bool invalidate(Function &, const PreservedAnalyses &) { return false; }
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AliasResult alias(const MemoryLocation &LocA, const MemoryLocation &LocB) {
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CB();
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return MayAlias;
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}
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};
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}
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namespace {
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/// A wrapper pass for the legacy pass manager to use with the above custom AA
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/// result.
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class TestCustomAAWrapperPass : public ImmutablePass {
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std::function<void()> CB;
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std::unique_ptr<TestCustomAAResult> Result;
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public:
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static char ID;
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explicit TestCustomAAWrapperPass(
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std::function<void()> CB = std::function<void()>())
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: ImmutablePass(ID), CB(std::move(CB)) {
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initializeTestCustomAAWrapperPassPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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}
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bool doInitialization(Module &M) override {
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Result.reset(new TestCustomAAResult(std::move(CB)));
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return true;
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}
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bool doFinalization(Module &M) override {
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Result.reset();
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return true;
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}
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TestCustomAAResult &getResult() { return *Result; }
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const TestCustomAAResult &getResult() const { return *Result; }
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};
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}
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char TestCustomAAWrapperPass::ID = 0;
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INITIALIZE_PASS_BEGIN(TestCustomAAWrapperPass, "test-custom-aa",
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"Test Custom AA Wrapper Pass", false, true)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_END(TestCustomAAWrapperPass, "test-custom-aa",
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"Test Custom AA Wrapper Pass", false, true)
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namespace {
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class AliasAnalysisTest : public testing::Test {
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protected:
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LLVMContext C;
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Module M;
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TargetLibraryInfoImpl TLII;
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TargetLibraryInfo TLI;
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std::unique_ptr<AssumptionCache> AC;
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std::unique_ptr<BasicAAResult> BAR;
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std::unique_ptr<AAResults> AAR;
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AliasAnalysisTest() : M("AliasAnalysisTest", C), TLI(TLII) {}
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AAResults &getAAResults(Function &F) {
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// Reset the Function AA results first to clear out any references.
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AAR.reset(new AAResults(TLI));
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// Build the various AA results and register them.
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AC.reset(new AssumptionCache(F));
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BAR.reset(new BasicAAResult(M.getDataLayout(), TLI, *AC));
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AAR->addAAResult(*BAR);
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return *AAR;
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}
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};
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TEST_F(AliasAnalysisTest, getModRefInfo) {
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// Setup function.
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(C), std::vector<Type *>(), false);
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auto *F = cast<Function>(M.getOrInsertFunction("f", 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 *Value = ConstantInt::get(IntType, 42);
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auto *Addr = ConstantPointerNull::get(PtrType);
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auto *Store1 = new StoreInst(Value, Addr, BB);
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auto *Load1 = new LoadInst(Addr, "load", BB);
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auto *Add1 = BinaryOperator::CreateAdd(Value, Value, "add", BB);
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auto *VAArg1 = new VAArgInst(Addr, PtrType, "vaarg", BB);
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auto *CmpXChg1 = new AtomicCmpXchgInst(
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Addr, ConstantInt::get(IntType, 0), ConstantInt::get(IntType, 1),
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AtomicOrdering::Monotonic, AtomicOrdering::Monotonic, CrossThread, BB);
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auto *AtomicRMW =
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new AtomicRMWInst(AtomicRMWInst::Xchg, Addr, ConstantInt::get(IntType, 1),
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AtomicOrdering::Monotonic, CrossThread, BB);
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ReturnInst::Create(C, nullptr, BB);
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auto &AA = getAAResults(*F);
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// Check basic results
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EXPECT_EQ(AA.getModRefInfo(Store1, MemoryLocation()), MRI_Mod);
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EXPECT_EQ(AA.getModRefInfo(Store1), MRI_Mod);
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EXPECT_EQ(AA.getModRefInfo(Load1, MemoryLocation()), MRI_Ref);
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EXPECT_EQ(AA.getModRefInfo(Load1), MRI_Ref);
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EXPECT_EQ(AA.getModRefInfo(Add1, MemoryLocation()), MRI_NoModRef);
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EXPECT_EQ(AA.getModRefInfo(Add1), MRI_NoModRef);
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EXPECT_EQ(AA.getModRefInfo(VAArg1, MemoryLocation()), MRI_ModRef);
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EXPECT_EQ(AA.getModRefInfo(VAArg1), MRI_ModRef);
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EXPECT_EQ(AA.getModRefInfo(CmpXChg1, MemoryLocation()), MRI_ModRef);
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EXPECT_EQ(AA.getModRefInfo(CmpXChg1), MRI_ModRef);
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EXPECT_EQ(AA.getModRefInfo(AtomicRMW, MemoryLocation()), MRI_ModRef);
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EXPECT_EQ(AA.getModRefInfo(AtomicRMW), MRI_ModRef);
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}
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class AAPassInfraTest : public testing::Test {
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protected:
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LLVMContext C;
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SMDiagnostic Err;
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std::unique_ptr<Module> M;
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public:
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AAPassInfraTest()
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: M(parseAssemblyString("define i32 @f(i32* %x, i32* %y) {\n"
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"entry:\n"
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" %lx = load i32, i32* %x\n"
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" %ly = load i32, i32* %y\n"
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" %sum = add i32 %lx, %ly\n"
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" ret i32 %sum\n"
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"}\n",
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Err, C)) {
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assert(M && "Failed to build the module!");
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}
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};
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TEST_F(AAPassInfraTest, injectExternalAA) {
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legacy::PassManager PM;
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// Register our custom AA's wrapper pass manually.
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bool IsCustomAAQueried = false;
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PM.add(new TestCustomAAWrapperPass([&] { IsCustomAAQueried = true; }));
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// Now add the external AA wrapper with a lambda which queries for the
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// wrapper around our custom AA and adds it to the results.
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PM.add(createExternalAAWrapperPass([](Pass &P, Function &, AAResults &AAR) {
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if (auto *WrapperPass = P.getAnalysisIfAvailable<TestCustomAAWrapperPass>())
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AAR.addAAResult(WrapperPass->getResult());
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}));
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// And run a pass that will make some alias queries. This will automatically
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// trigger the rest of the alias analysis stack to be run. It is analagous to
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// building a full pass pipeline with any of the existing pass manager
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// builders.
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PM.add(new AATestPass());
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PM.run(*M);
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// Finally, ensure that our custom AA was indeed queried.
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EXPECT_TRUE(IsCustomAAQueried);
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}
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} // end anonymous namspace
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