[cfe-dev] Handling static analyzer diagnostics

[Artem Dergachev via cfe-dev]

AnalysisConsumer automatically populates PathDiagnosticConsumers 
according to AnalyzerOptions and the default is not empty; you might as 
well be writing html or plist files with your tests (the actual default 
is different depending on how everything is invoked and i'm not sure 
what it is in your case). You might have to implement a way to clear the 
consumers before adding your consumer.

Why do you have to go that far though? Are llvm-lit tests not an answer 
to everything?

On 1/6/21 3:03 AM, Stefan Schulze Frielinghaus via cfe-dev wrote:
> Hi all,
>
> I've been playing around with the Static Analyzer in an external code tree and
> came up with a couple of tests based upon GoogleTest.  Inspired by the unit
> tests found in the clang source tree I came up with a PathDiagnosticConsumer
> attached at the end of this mail.
>
> All that works.  However, running the test suite also results in printing the
> warning to stderr which somehow clutters the output of a test suite run.  I'm
> wondering whether it is possible to silence a warning which I handle via my
> DiagConsumer explicitly whereas all other warnings are still printed to stderr?
>
> Cheers,
> Stefan
>
>
>
> class DiagConsumer : public PathDiagnosticConsumer {
>    llvm::raw_ostream &Output;
> public:
>    DiagConsumer(llvm::raw_ostream &Output) : Output(Output) {}
>    void FlushDiagnosticsImpl(std::vector<const PathDiagnostic *> &Diags,
>                              FilesMade *filesMade) override {
>      for (const auto *PD : Diags)
>        Output << PD->getCheckerName() << ":" << PD->getShortDescription() << '\n';
>    }
>    StringRef getName() const override { return "Test"; }
> };
>
> class TestAction : public AnalysisAction {
>    llvm::raw_ostream &DiagsOutput;
> public:
>    TestAction(llvm::raw_ostream &DiagsOutput) : DiagsOutput(DiagsOutput) {}
> protected:
>    std::unique_ptr<clang::ASTConsumer> CreateASTConsumer(clang::CompilerInstance &CI,
>                                                          clang::StringRef InFile) override {
>      std::unique_ptr<AnalysisASTConsumer> AnalysisConsumer = CreateAnalysisConsumer(CI);
>      auto analyzerOpts = CI.getAnalyzerOpts();
>      analyzerOpts->CheckersAndPackages = {{"foobar", true}};
>      AnalysisConsumer->AddCheckerRegistrationFn([](CheckerRegistry &Registry) {
>        Registry.addChecker<Foobar>("foobar", "", "");
>      });
>      AnalysisConsumer->AddDiagnosticConsumer(new DiagConsumer(DiagsOutput));
>      return std::move(AnalysisConsumer);
>    }
> };
>
> TEST(X, Y) {
>    std::string Diags;
>    llvm::raw_string_ostream OS(Diags);
>    auto Code = /* ... */
>    EXPECT_TRUE(tooling::runToolOnCode(std::make_unique<TestAction>(OS), Code, "FileName.c"));
>    EXPECT_EQ(Diags, "foobar:baz\n");
> }
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