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1//===- PrintFunctionNames.cpp ---------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// Example clang plugin which simply prints the names of all the top-level decls10// in the input file.11//12//===----------------------------------------------------------------------===//13 14#include "clang/Frontend/FrontendPluginRegistry.h"15#include "clang/AST/AST.h"16#include "clang/AST/ASTConsumer.h"17#include "clang/AST/RecursiveASTVisitor.h"18#include "clang/Frontend/CompilerInstance.h"19#include "clang/Sema/Sema.h"20#include "llvm/Support/raw_ostream.h"21using namespace clang;22 23namespace {24 25class PrintFunctionsConsumer : public ASTConsumer {26  CompilerInstance &Instance;27  std::set<std::string> ParsedTemplates;28 29public:30  PrintFunctionsConsumer(CompilerInstance &Instance,31                         std::set<std::string> ParsedTemplates)32      : Instance(Instance), ParsedTemplates(ParsedTemplates) {}33 34  bool HandleTopLevelDecl(DeclGroupRef DG) override {35    for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {36      const Decl *D = *i;37      if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))38        llvm::errs() << "top-level-decl: \"" << ND->getNameAsString() << "\"\n";39    }40 41    return true;42  }43 44  void HandleTranslationUnit(ASTContext& context) override {45    if (!Instance.getLangOpts().DelayedTemplateParsing)46      return;47 48    // This demonstrates how to force instantiation of some templates in49    // -fdelayed-template-parsing mode. (Note: Doing this unconditionally for50    // all templates is similar to not using -fdelayed-template-parsig in the51    // first place.)52    // The advantage of doing this in HandleTranslationUnit() is that all53    // codegen (when using -add-plugin) is completely finished and this can't54    // affect the compiler output.55    struct Visitor : public RecursiveASTVisitor<Visitor> {56      const std::set<std::string> &ParsedTemplates;57      Visitor(const std::set<std::string> &ParsedTemplates)58          : ParsedTemplates(ParsedTemplates) {}59      bool VisitFunctionDecl(FunctionDecl *FD) {60        if (FD->isLateTemplateParsed() &&61            ParsedTemplates.count(FD->getNameAsString()))62          LateParsedDecls.insert(FD);63        return true;64      }65 66      std::set<FunctionDecl*> LateParsedDecls;67    } v(ParsedTemplates);68    v.TraverseDecl(context.getTranslationUnitDecl());69    clang::Sema &sema = Instance.getSema();70    for (const FunctionDecl *FD : v.LateParsedDecls) {71      clang::LateParsedTemplate &LPT =72          *sema.LateParsedTemplateMap.find(FD)->second;73      sema.LateTemplateParser(sema.OpaqueParser, LPT);74      llvm::errs() << "late-parsed-decl: \"" << FD->getNameAsString() << "\"\n";75    }76  }77};78 79class PrintFunctionNamesAction : public PluginASTAction {80  std::set<std::string> ParsedTemplates;81protected:82  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,83                                                 llvm::StringRef) override {84    return std::make_unique<PrintFunctionsConsumer>(CI, ParsedTemplates);85  }86 87  bool ParseArgs(const CompilerInstance &CI,88                 const std::vector<std::string> &args) override {89    for (unsigned i = 0, e = args.size(); i != e; ++i) {90      llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";91 92      // Example error handling.93      DiagnosticsEngine &D = CI.getDiagnostics();94      if (args[i] == "-an-error") {95        unsigned DiagID = D.getCustomDiagID(DiagnosticsEngine::Error,96                                            "invalid argument '%0'");97        D.Report(DiagID) << args[i];98        return false;99      } else if (args[i] == "-parse-template") {100        if (i + 1 >= e) {101          D.Report(D.getCustomDiagID(DiagnosticsEngine::Error,102                                     "missing -parse-template argument"));103          return false;104        }105        ++i;106        ParsedTemplates.insert(args[i]);107      }108    }109    if (!args.empty() && args[0] == "help")110      PrintHelp(llvm::errs());111 112    return true;113  }114  void PrintHelp(llvm::raw_ostream& ros) {115    ros << "Help for PrintFunctionNames plugin goes here\n";116  }117 118};119 120}121 122static FrontendPluginRegistry::Add<PrintFunctionNamesAction>123X("print-fns", "print function names");124