=======================
Let's look at an example plugin that prints top-level function names. This
-example is also checked into the clang repository; please also take a look at
-the latest `checked in version of PrintFunctionNames.cpp
+example is checked into the clang repository; please take a look at
+the `latest version of PrintFunctionNames.cpp
<http://llvm.org/viewvc/llvm-project/cfe/trunk/examples/PrintFunctionNames/PrintFunctionNames.cpp?view=markup>`_.
-.. code-block:: c++
-
- #include "clang/Frontend/FrontendPluginRegistry.h"
- #include "clang/AST/ASTConsumer.h"
- #include "clang/AST/AST.h"
- #include "clang/Frontend/CompilerInstance.h"
- #include "llvm/Support/raw_ostream.h"
- using namespace clang;
-
- namespace {
-
- class PrintFunctionsConsumer : public ASTConsumer {
- public:
- virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
- for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
- const Decl *D = *i;
- if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
- llvm::errs() << "top-level-decl: \"" << ND->getNameAsString() << "\"\n";
- }
-
- return true;
- }
- };
-
- class PrintFunctionNamesAction : public PluginASTAction {
- protected:
- ASTConsumer *CreateASTConsumer(CompilerInstance &CI, llvm::StringRef) {
- return new PrintFunctionsConsumer();
- }
-
- bool ParseArgs(const CompilerInstance &CI,
- const std::vector<std::string>& args) {
- for (unsigned i = 0, e = args.size(); i != e; ++i) {
- llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";
-
- // Example error handling.
- if (args[i] == "-an-error") {
- DiagnosticsEngine &D = CI.getDiagnostics();
- unsigned DiagID = D.getCustomDiagID(
- DiagnosticsEngine::Error, "invalid argument '" + args[i] + "'");
- D.Report(DiagID);
- return false;
- }
- }
- if (args.size() && args[0] == "help")
- PrintHelp(llvm::errs());
-
- return true;
- }
- void PrintHelp(llvm::raw_ostream& ros) {
- ros << "Help for PrintFunctionNames plugin goes here\n";
- }
-
- };
-
- }
-
- static FrontendPluginRegistry::Add<PrintFunctionNamesAction>
- X("print-fns", "print function names");
-
Running the plugin
==================