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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
388 lines
10 KiB
C++
388 lines
10 KiB
C++
//===- CFGTest.cpp - CFG tests --------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/CFG.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstIterator.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/Pass.h"
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#include "llvm/Support/ErrorHandling.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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namespace {
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// This fixture assists in running the isPotentiallyReachable utility four ways
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// and ensuring it produces the correct answer each time.
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class IsPotentiallyReachableTest : public testing::Test {
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protected:
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void ParseAssembly(const char *Assembly) {
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SMDiagnostic Error;
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M = parseAssemblyString(Assembly, Error, Context);
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std::string errMsg;
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raw_string_ostream os(errMsg);
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Error.print("", os);
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// A failure here means that the test itself is buggy.
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if (!M)
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report_fatal_error(os.str().c_str());
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Function *F = M->getFunction("test");
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if (F == nullptr)
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report_fatal_error("Test must have a function named @test");
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A = B = nullptr;
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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if (I->hasName()) {
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if (I->getName() == "A")
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A = &*I;
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else if (I->getName() == "B")
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B = &*I;
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}
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}
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if (A == nullptr)
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report_fatal_error("@test must have an instruction %A");
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if (B == nullptr)
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report_fatal_error("@test must have an instruction %B");
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}
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void ExpectPath(bool ExpectedResult) {
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static char ID;
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class IsPotentiallyReachableTestPass : public FunctionPass {
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public:
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IsPotentiallyReachableTestPass(bool ExpectedResult,
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Instruction *A, Instruction *B)
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: FunctionPass(ID), ExpectedResult(ExpectedResult), A(A), B(B) {}
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static int initialize() {
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PassInfo *PI = new PassInfo("isPotentiallyReachable testing pass",
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"", &ID, nullptr, true, true);
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PassRegistry::getPassRegistry()->registerPass(*PI, false);
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initializeLoopInfoWrapperPassPass(*PassRegistry::getPassRegistry());
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initializeDominatorTreeWrapperPassPass(
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*PassRegistry::getPassRegistry());
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return 0;
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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<LoopInfoWrapperPass>();
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AU.addRequired<DominatorTreeWrapperPass>();
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}
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bool runOnFunction(Function &F) override {
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if (!F.hasName() || F.getName() != "test")
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return false;
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LoopInfo *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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DominatorTree *DT =
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&getAnalysis<DominatorTreeWrapperPass>().getDomTree();
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EXPECT_EQ(isPotentiallyReachable(A, B, nullptr, nullptr),
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ExpectedResult);
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EXPECT_EQ(isPotentiallyReachable(A, B, DT, nullptr), ExpectedResult);
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EXPECT_EQ(isPotentiallyReachable(A, B, nullptr, LI), ExpectedResult);
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EXPECT_EQ(isPotentiallyReachable(A, B, DT, LI), ExpectedResult);
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return false;
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}
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bool ExpectedResult;
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Instruction *A, *B;
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};
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static int initialize = IsPotentiallyReachableTestPass::initialize();
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(void)initialize;
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IsPotentiallyReachableTestPass *P =
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new IsPotentiallyReachableTestPass(ExpectedResult, A, B);
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legacy::PassManager PM;
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PM.add(P);
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PM.run(*M);
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}
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LLVMContext Context;
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std::unique_ptr<Module> M;
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Instruction *A, *B;
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};
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}
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TEST_F(IsPotentiallyReachableTest, SameBlockNoPath) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" bitcast i8 undef to i8\n"
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" %B = bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" %A = bitcast i8 undef to i8\n"
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" ret void\n"
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"}\n");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, SameBlockPath) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" %A = bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" %B = bitcast i8 undef to i8\n"
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" ret void\n"
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"}\n");
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, SameBlockNoLoop) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" br label %middle\n"
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"middle:\n"
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" %B = bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" bitcast i8 undef to i8\n"
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" %A = bitcast i8 undef to i8\n"
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" br label %nextblock\n"
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"nextblock:\n"
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" ret void\n"
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"}\n");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, StraightNoPath) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" %B = bitcast i8 undef to i8\n"
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" br label %exit\n"
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"exit:\n"
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" %A = bitcast i8 undef to i8\n"
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" ret void\n"
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"}");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, StraightPath) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" %A = bitcast i8 undef to i8\n"
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" br label %exit\n"
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"exit:\n"
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" %B = bitcast i8 undef to i8\n"
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" ret void\n"
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"}");
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, DestUnreachable) {
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ParseAssembly(
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"define void @test() {\n"
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"entry:\n"
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" br label %midblock\n"
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"midblock:\n"
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" %A = bitcast i8 undef to i8\n"
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" ret void\n"
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"unreachable:\n"
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" %B = bitcast i8 undef to i8\n"
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" br label %midblock\n"
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"}");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, BranchToReturn) {
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ParseAssembly(
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"define void @test(i1 %x) {\n"
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"entry:\n"
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" %A = bitcast i8 undef to i8\n"
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" br i1 %x, label %block1, label %block2\n"
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"block1:\n"
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" ret void\n"
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"block2:\n"
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" %B = bitcast i8 undef to i8\n"
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" ret void\n"
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"}");
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, SimpleLoop1) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %loop\n"
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"loop:\n"
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" %B = bitcast i8 undef to i8\n"
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" %A = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %loop, label %exit\n"
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"exit:\n"
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" ret void\n"
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"}");
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, SimpleLoop2) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" %B = bitcast i8 undef to i8\n"
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" br label %loop\n"
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"loop:\n"
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" %A = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %loop, label %exit\n"
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"exit:\n"
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" ret void\n"
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"}");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, SimpleLoop3) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %loop\n"
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"loop:\n"
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" %B = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %loop, label %exit\n"
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"exit:\n"
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" %A = bitcast i8 undef to i8\n"
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" ret void\n"
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"}");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther1) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %loop1\n"
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"loop1:\n"
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" %A = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %loop1, label %loop1exit\n"
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"loop1exit:\n"
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" br label %loop2\n"
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"loop2:\n"
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" %B = bitcast i8 undef to i8\n"
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" %y = call i1 @switch()\n"
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" br i1 %x, label %loop2, label %loop2exit\n"
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"loop2exit:"
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" ret void\n"
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"}");
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOther2) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %loop1\n"
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"loop1:\n"
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" %B = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %loop1, label %loop1exit\n"
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"loop1exit:\n"
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" br label %loop2\n"
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"loop2:\n"
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" %A = bitcast i8 undef to i8\n"
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" %y = call i1 @switch()\n"
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" br i1 %x, label %loop2, label %loop2exit\n"
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"loop2exit:"
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" ret void\n"
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"}");
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ExpectPath(false);
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}
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TEST_F(IsPotentiallyReachableTest, OneLoopAfterTheOtherInsideAThirdLoop) {
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ParseAssembly(
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %outerloop3\n"
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"outerloop3:\n"
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" br label %innerloop1\n"
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"innerloop1:\n"
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" %B = bitcast i8 undef to i8\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %innerloop1, label %innerloop1exit\n"
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"innerloop1exit:\n"
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" br label %innerloop2\n"
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"innerloop2:\n"
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" %A = bitcast i8 undef to i8\n"
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" %y = call i1 @switch()\n"
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" br i1 %x, label %innerloop2, label %innerloop2exit\n"
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"innerloop2exit:"
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" ;; In outer loop3 now.\n"
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" %z = call i1 @switch()\n"
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" br i1 %z, label %outerloop3, label %exit\n"
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"exit:\n"
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" ret void\n"
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"}");
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ExpectPath(true);
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}
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static const char *BranchInsideLoopIR =
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"declare i1 @switch()\n"
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"\n"
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"define void @test() {\n"
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"entry:\n"
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" br label %loop\n"
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"loop:\n"
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" %x = call i1 @switch()\n"
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" br i1 %x, label %nextloopblock, label %exit\n"
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"nextloopblock:\n"
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" %y = call i1 @switch()\n"
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" br i1 %y, label %left, label %right\n"
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"left:\n"
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" %A = bitcast i8 undef to i8\n"
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" br label %loop\n"
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"right:\n"
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" %B = bitcast i8 undef to i8\n"
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" br label %loop\n"
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"exit:\n"
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" ret void\n"
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"}";
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TEST_F(IsPotentiallyReachableTest, BranchInsideLoop) {
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ParseAssembly(BranchInsideLoopIR);
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ExpectPath(true);
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}
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TEST_F(IsPotentiallyReachableTest, ModifyTest) {
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ParseAssembly(BranchInsideLoopIR);
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succ_iterator S = succ_begin(&*++M->getFunction("test")->begin());
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BasicBlock *OldBB = S[0];
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S[0] = S[1];
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ExpectPath(false);
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S[0] = OldBB;
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ExpectPath(true);
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}
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