[cfe-dev] LangOpts && "Unexpected diagnostic outside source file processing" failed.

[Alberto Magni]

Hi everybody,

I am new to clang and I am trying to learn it going through this tutorial:
http://www.cs.rpi.edu/~laprej/clang.html
I have a very basic problem though.  After some work I ended up to this
piece of code:

int main(int argc, char** argv)
{
    FileManager* fileManager = new FileManager();
    LangOptions* languageOptions = new LangOptions();
    languageOptions->BCPLComment=1;
    languageOptions->C99=1;
    DiagnosticOptions* diagnosticOptions=new DiagnosticOptions();
    llvm::raw_os_ostream os(cout);
    TextDiagnosticPrinter* diagnosticClient=new
TextDiagnosticPrinter(os,*diagnosticOptions,true);
    Diagnostic* diagnostic = new Diagnostic(diagnosticClient);
    SourceManager* sourceManager= new SourceManager(*diagnostic);
    HeaderSearch* headerSearch = new HeaderSearch(*fileManager);
    TargetOptions targetOptions;
    targetOptions.Triple=LLVM_HOSTTRIPLE;
    TargetInfo *targetInfo = TargetInfo::CreateTargetInfo (*diagnostic,
targetOptions);
    Preprocessor* preprocessor = new Preprocessor(*diagnostic,
*languageOptions, *targetInfo, *sourceManager, *headerSearch);
    const FileEntry* fileEntry=fileManager->getFile("test.c");
    sourceManager->createMainFileID(fileEntry);
    preprocessor->EnterMainSourceFile();
    Token token;
    do
    {
        preprocessor->Lex(token);
        if(diagnostic->hasErrorOccurred())
        {
            break;
        }
        preprocessor->DumpToken(token);
        std::cerr << std::endl;
    }
    while(token.isNot(tok::eof));
    diagnosticClient->EndSourceFile();
    return 0;
}

This works well with input files with not errors or no warnings.

Then I give as input this very minimalistic file (test.c):

int main() {
  /* Nested /* comments */
}

The parsing of this code should produce a warning for the presence of the
nested comment, but instead I get this output:

int 'int'
identifier 'main'
l_paren '('
r_paren ')'
l_brace '{'
clangExample: TextDiagnosticPrinter.cpp:298: void
clang::TextDiagnosticPrinter::EmitCaretDiagnostic(clang::SourceLocation,
clang::CharSourceRange*, unsigned int, const clang::SourceManager&, const
clang::FixItHint*, unsigned int, unsigned int, unsigned int, unsigned int,
unsigned int): Assertion `LangOpts && "Unexpected diagnostic outside source
file processing"' failed.

The problem is that the preprocessor tries to output the diagnostic message
outside the right context. I also tried to call the
diagnosticClient->BeginSourceFile function before the parsing of the file
but no warning is displayed either, the parsing is stopped with no messages
at all.

I also tried the CompilerInstance/CompilerInvocation approach with the same
result.

How can I fix this issue? Where am I wrong ?

Any help is greatly appreciated.

Thank you in advance

Alberto
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