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      1 //===- PrintFunctionNames.cpp ---------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // Example clang plugin which simply prints the names of all the top-level decls
     11 // in the input file.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "clang/Frontend/FrontendPluginRegistry.h"
     16 #include "clang/AST/ASTConsumer.h"
     17 #include "clang/AST/AST.h"
     18 #include "clang/Frontend/CompilerInstance.h"
     19 #include "llvm/Support/raw_ostream.h"
     20 using namespace clang;
     21 
     22 namespace {
     23 
     24 class PrintFunctionsConsumer : public ASTConsumer {
     25 public:
     26   virtual void HandleTopLevelDecl(DeclGroupRef DG) {
     27     for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
     28       const Decl *D = *i;
     29       if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
     30         llvm::errs() << "top-level-decl: \"" << ND->getNameAsString() << "\"\n";
     31     }
     32   }
     33 };
     34 
     35 class PrintFunctionNamesAction : public PluginASTAction {
     36 protected:
     37   ASTConsumer *CreateASTConsumer(CompilerInstance &CI, llvm::StringRef) {
     38     return new PrintFunctionsConsumer();
     39   }
     40 
     41   bool ParseArgs(const CompilerInstance &CI,
     42                  const std::vector<std::string>& args) {
     43     for (unsigned i = 0, e = args.size(); i != e; ++i) {
     44       llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";
     45 
     46       // Example error handling.
     47       if (args[i] == "-an-error") {
     48         DiagnosticsEngine &D = CI.getDiagnostics();
     49         unsigned DiagID = D.getCustomDiagID(
     50           DiagnosticsEngine::Error, "invalid argument '" + args[i] + "'");
     51         D.Report(DiagID);
     52         return false;
     53       }
     54     }
     55     if (args.size() && args[0] == "help")
     56       PrintHelp(llvm::errs());
     57 
     58     return true;
     59   }
     60   void PrintHelp(llvm::raw_ostream& ros) {
     61     ros << "Help for PrintFunctionNames plugin goes here\n";
     62   }
     63 
     64 };
     65 
     66 }
     67 
     68 static FrontendPluginRegistry::Add<PrintFunctionNamesAction>
     69 X("print-fns", "print function names");
     70