Example #1
CXDiagnosticSetImpl *cxdiag::lazyCreateDiags(CXTranslationUnit TU,
                                             bool checkIfChanged) {
  ASTUnit *AU = static_cast<ASTUnit *>(TU->TUData);

  if (TU->Diagnostics && checkIfChanged) {
    // In normal use, ASTUnit's diagnostics should not change unless we reparse.
    // Currently they can only change by using the internal testing flag
    // '-error-on-deserialized-decl' which will error during deserialization of
    // a declaration. What will happen is:
    //  -c-index-test gets a CXTranslationUnit
    //  -checks the diagnostics, the diagnostics set is lazily created,
    //     no errors are reported
    //  -later does an operation, like annotation of tokens, that triggers
    //     -error-on-deserialized-decl, that will emit a diagnostic error,
    //     that ASTUnit will catch and add to its stored diagnostics vector.
    //  -c-index-test wants to check whether an error occurred after performing
    //     the operation but can only query the lazily created set.
    // We check here if a new diagnostic was appended since the last time the
    // diagnostic set was created, in which case we reset it.

    CXDiagnosticSetImpl *
      Set = static_cast<CXDiagnosticSetImpl*>(TU->Diagnostics);
    if (AU->stored_diag_size() != Set->getNumDiagnostics()) {
      // Diagnostics in the ASTUnit were updated, reset the associated
      // diagnostics.
      delete Set;
      TU->Diagnostics = 0;

  if (!TU->Diagnostics) {
    CXDiagnosticSetImpl *Set = new CXDiagnosticSetImpl();
    TU->Diagnostics = Set;
    DiagnosticOptions DOpts;
    CXDiagnosticRenderer Renderer(AU->getSourceManager(),
                                  DOpts, Set);
    for (ASTUnit::stored_diag_iterator it = AU->stored_diag_begin(),
         ei = AU->stored_diag_end(); it != ei; ++it) {
  return static_cast<CXDiagnosticSetImpl*>(TU->Diagnostics);