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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/AST.h"
     17 #include "clang/AST/ASTConsumer.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   bool HandleTopLevelDecl(DeclGroupRef DG) override {
     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     return true;
     34   }
     35 };
     36 
     37 class PrintFunctionNamesAction : public PluginASTAction {
     38 protected:
     39   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
     40                                                  llvm::StringRef) override {
     41     return llvm::make_unique<PrintFunctionsConsumer>();
     42   }
     43 
     44   bool ParseArgs(const CompilerInstance &CI,
     45                  const std::vector<std::string> &args) override {
     46     for (unsigned i = 0, e = args.size(); i != e; ++i) {
     47       llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";
     48 
     49       // Example error handling.
     50       if (args[i] == "-an-error") {
     51         DiagnosticsEngine &D = CI.getDiagnostics();
     52         unsigned DiagID = D.getCustomDiagID(DiagnosticsEngine::Error,
     53                                             "invalid argument '%0'");
     54         D.Report(DiagID) << args[i];
     55         return false;
     56       }
     57     }
     58     if (!args.empty() && args[0] == "help")
     59       PrintHelp(llvm::errs());
     60 
     61     return true;
     62   }
     63   void PrintHelp(llvm::raw_ostream& ros) {
     64     ros << "Help for PrintFunctionNames plugin goes here\n";
     65   }
     66 
     67 };
     68 
     69 }
     70 
     71 static FrontendPluginRegistry::Add<PrintFunctionNamesAction>
     72 X("print-fns", "print function names");
     73