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: HandleTopLevelDecl(DeclGroupRef DG)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: CreateASTConsumer(CompilerInstance & CI,llvm::StringRef)37 ASTConsumer *CreateASTConsumer(CompilerInstance &CI, llvm::StringRef) { 38 return new PrintFunctionsConsumer(); 39 } 40 ParseArgs(const CompilerInstance & CI,const std::vector<std::string> & args)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 Diagnostic &D = CI.getDiagnostics(); 49 unsigned DiagID = D.getCustomDiagID( 50 Diagnostic::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 } PrintHelp(llvm::raw_ostream & ros)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