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120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
//===- unittests/StaticAnalyzer/SymbolReaperTest.cpp ----------------------===//
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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 "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
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#include "clang/CrossTU/CrossTranslationUnit.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
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#include "clang/StaticAnalyzer/Frontend/AnalysisConsumer.h"
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#include "clang/Tooling/Tooling.h"
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#include "gtest/gtest.h"
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namespace clang {
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namespace ento {
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namespace {
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using namespace ast_matchers;
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// A re-usable consumer that constructs ExprEngine out of CompilerInvocation.
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// TODO: Actually re-use it when we write our second test.
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class ExprEngineConsumer : public ASTConsumer {
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protected:
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CompilerInstance &C;
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private:
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// We need to construct all of these in order to construct ExprEngine.
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CheckerManager ChkMgr;
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cross_tu::CrossTranslationUnitContext CTU;
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PathDiagnosticConsumers Consumers;
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AnalysisManager AMgr;
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SetOfConstDecls VisitedCallees;
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FunctionSummariesTy FS;
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protected:
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ExprEngine Eng;
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// Find a declaration in the current AST by name. This has nothing to do
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// with ExprEngine but turns out to be handy.
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// TODO: There's probably a better place for it.
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template <typename T>
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const T *findDeclByName(const Decl *Where, StringRef Name) {
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auto Matcher = decl(hasDescendant(namedDecl(hasName(Name)).bind("d")));
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auto Matches = match(Matcher, *Where, Eng.getContext());
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assert(Matches.size() == 1 && "Ambiguous name!");
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const T *Node = selectFirst<T>("d", Matches);
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assert(Node && "Name not found!");
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return Node;
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}
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public:
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ExprEngineConsumer(CompilerInstance &C)
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: C(C), ChkMgr(C.getASTContext(), *C.getAnalyzerOpts()), CTU(C),
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Consumers(),
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AMgr(C.getASTContext(), C.getDiagnostics(), Consumers,
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CreateRegionStoreManager, CreateRangeConstraintManager, &ChkMgr,
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*C.getAnalyzerOpts()),
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VisitedCallees(), FS(),
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Eng(CTU, AMgr, &VisitedCallees, &FS, ExprEngine::Inline_Regular) {}
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};
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class SuperRegionLivenessConsumer : public ExprEngineConsumer {
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void performTest(const Decl *D) {
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const auto *FD = findDeclByName<FieldDecl>(D, "x");
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const auto *VD = findDeclByName<VarDecl>(D, "s");
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assert(FD && VD);
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// The variable must belong to a stack frame,
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// otherwise SymbolReaper would think it's a global.
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const StackFrameContext *SFC =
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Eng.getAnalysisDeclContextManager().getStackFrame(D);
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// Create regions for 's' and 's.x'.
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const VarRegion *VR = Eng.getRegionManager().getVarRegion(VD, SFC);
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const FieldRegion *FR = Eng.getRegionManager().getFieldRegion(FD, VR);
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// Pass a null location context to the SymbolReaper so that
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// it was thinking that the variable is dead.
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SymbolReaper SymReaper((StackFrameContext *)nullptr, (Stmt *)nullptr,
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Eng.getSymbolManager(), Eng.getStoreManager());
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SymReaper.markLive(FR);
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EXPECT_TRUE(SymReaper.isLiveRegion(VR));
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}
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public:
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SuperRegionLivenessConsumer(CompilerInstance &C) : ExprEngineConsumer(C) {}
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~SuperRegionLivenessConsumer() override {}
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bool HandleTopLevelDecl(DeclGroupRef DG) override {
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for (const auto *D : DG)
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performTest(D);
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return true;
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}
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};
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class SuperRegionLivenessAction: public ASTFrontendAction {
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public:
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SuperRegionLivenessAction() {}
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std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &Compiler,
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StringRef File) override {
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return llvm::make_unique<SuperRegionLivenessConsumer>(Compiler);
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}
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};
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// Test that marking s.x as live would also make s live.
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TEST(SymbolReaper, SuperRegionLiveness) {
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EXPECT_TRUE(tooling::runToolOnCode(new SuperRegionLivenessAction,
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"void foo() { struct S { int x; } s; }"));
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}
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} // namespace
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} // namespace ento
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} // namespace clang
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