3

我有一个 MatchFinder 定义为：

MatchFinder Finder;
Finder.addMatcher(FunctionCallMatcher, &printer);

而 DeclarationMatcher 和 MatchCallback 如下：

DeclarationMatcher FunctionCallMatcher = functionDecl(isDefinition()).bind("func");

class FuncPrinter : public MatchFinder::MatchCallback {
public :
  FuncPrinter(){Replace = new Replacements;}
  FuncPrinter(Replacements *Replace) : Replace(Replace) {}
  virtual void run(const MatchFinder::MatchResult &Result) {
    clang::ASTContext *Context = Result.Context;

    if (const FunctionDecl *FS = Result.Nodes.getNodeAs<clang::FunctionDecl>("func")) {
      FS->dump();
      SourceRange sr = FS->getSourceRange();
      std::string s = std::string("test");
      Replacement Rep(*(Result.SourceManager), sr.getEnd(), s.length(), s);
      if(llvm::Error err = Replace->add(Rep)) {

      }
    }
  }
private:
  Replacements *Replace;
};

在我的主代码中，我为查找器执行前端操作，并获取替换：

RefactoringTool Tool(OptionsParser.getCompilations(),
                 OptionsParser.getSourcePathList());
  FuncPrinter printer;
  MatchFinder Finder;
  Finder.addMatcher(FunctionCallMatcher, &printer);                                                                                                                            
  if (int Result = Tool.run(newFrontendActionFactory(&Finder).get())) {
    return Result;
  }
  std::map<std::string, Replacements>& reps = Tool.getReplacements();

虽然我可以观察到在执行 FrontendAction 时会填充 FuncPrinter 中的 Replace 变量，但Tool.getReplacements()返回一个空的std::map<std::string, Replacements>. 如果有人能指出我出错的地方，我将不胜感激。

4

1 回答 1

1

设法解决它，所以发布我自己的解决方案。问题在于使用默认构造函数，而具有FuncPrinter(reps_t *reps) does the trick. 

class FuncPrinter : public MatchFinder::MatchCallback {
  using reps_t = std::map<std::string, Replacements>;     
public :
  FuncPrinter(reps_t *reps) : Replace(reps) {}
  virtual void run(const MatchFinder::MatchResult &Result) {
    clang::ASTContext *Context = Result.Context;

    if (const FunctionDecl *FS = Result.Nodes.getNodeAs<clang::FunctionDecl>("func")) {
      FS->dump();
      SourceRange sr = FS->getSourceRange();
      std::string s = std::string("test");
      Replacement Rep(*(Result.SourceManager), sr.getEnd(), s.length(), s);
      Replace->insert(std::pair<std::string,Replacements>(path, Replacements(Rep)));
    }
  }
private:
  reps_t *Replace;
};
于 2017-02-27T18:38:01.183 回答