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func-name.cpp — C++ source code, 3 kB (3746 bytes)

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// PrintFunctions.cpp
#include <cstdio>
#include <string>
#include <iostream>
#include <sstream>
#include <fstream>

#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/ASTConsumers.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace clang::driver;
using namespace clang::tooling;
using namespace std;

static llvm::cl::OptionCategory MyOptionCategory("MyOptions");
static llvm::cl::opt<std::string> OutputFilename("o", 
        llvm::cl::desc("Specify output filename that contains stmt:type"), 
        llvm::cl::value_desc("output_filename"), llvm::cl::cat(MyOptionCategory));

LangOptions MyLangOpts; 
SourceManager *ptrMySourceMgr;
Rewriter MyRewriter;

class MyASTVisitor : public RecursiveASTVisitor<MyASTVisitor> {
    MyASTVisitor() {}
    bool VisitStmt(Stmt *s) {

        // Print a current statement and its type 
	std::string str1;
        llvm::raw_string_ostream os(str1);
        s->printPretty(os, NULL, MyLangOpts);

        printf("%s\n", os.str().c_str());
        printf("TYPE:%s\n", s->getStmtClassName());
        return true;

    bool VisitFunctionDecl(FunctionDecl *f) { // Print function name
        llvm::outs() << "*********************************\n";
        llvm::outs() << "*** FUNCTION NAME:" <<  f->getName() << '\n';
        llvm::outs() << "*********************************\n";
        return true;
class MyASTConsumer : public ASTConsumer {
    MyASTConsumer(): Visitor() {} //initialize MyASTVisitor

    virtual bool HandleTopLevelDecl(DeclGroupRef DR) {
        for (DeclGroupRef::iterator b = DR.begin(), e = DR.end(); b != e; ++b) {
            // Travel each function declaration using MyASTVisitor
        return true;

    MyASTVisitor Visitor;

class MyFrontendAction : public ASTFrontendAction {
  MyFrontendAction() {}
  void EndSourceFileAction() override { // Fill out if necessary

  std::unique_ptr<ASTConsumer> CreateASTConsumer(
                  CompilerInstance &CI, StringRef file) override {                                         

    MyLangOpts = CI.getLangOpts();
    ptrMySourceMgr= &(CI.getSourceManager());
    MyRewriter= Rewriter(*ptrMySourceMgr, MyLangOpts);

    return llvm::make_unique<MyASTConsumer>();

int main(int argc, const char **argv) {
  CommonOptionsParser op(argc, argv, MyOptionCategory);
  ClangTool Tool(op.getCompilations(), op.getSourcePathList());
  int rtn_flag;

  // ClangTool::run accepts a FrontendActionFactory, which is then used to
  // create new objects implementing the FrontendAction interface. Here we use
  // the helper newFrontendActionFactory to create a default factory that will
  // return a new MyFrontendAction object every time.
  // To further customize this, we could create our own factory class.

  // AST Parsing

  /* //
  // Rewriter sample. Save changed target code into output.txt if any 
  const RewriteBuffer *RewriteBuf = MyRewriter.getRewriteBufferFor
  ofstream out_file ("output.txt");
  out_file << string(RewriteBuf->begin(), RewriteBuf->end());

  return rtn_flag;
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