[cfe-dev] Preprocessor/Parser interaction

Aditya Kumar hiraditya at msn.com
Tue Feb 21 14:35:34 PST 2012

I want to use a PPCallback function (MacroExpands) to track all the locations where a macro has been invoked in the program. In the main function, there are a few things that I want to implement, details are given as comment inside the main function.
Till now what I have done is the following:
namespace clang {class MyASTAction : public FrontendAction{                   public:    ASTConsumer *CreateASTConsumer(CompilerInstance &CI,                  llvm::StringRef InFile)    {    return 0;   }    void ExecuteAction() { }
    bool usesPreprocessorOnly() const    { return false; }};  class TrackMacro : public PPCallbacks{   public:               void MacroExpands(const Token &MacroNameTok, const MacroInfo* MI,                    SourceRange Range)  {    std::cout<<"Macro expands to"<<MacroNameTok.getRawIdentifierData();  }  ~TrackMacro(){}};}
using namespace clang;int main(int argc, const char** argv){  MyASTAction action;  CompilerInstance Clang;
How to create an instance of the preprocessor class, it seems like it takes too many(9) arguments which I was not able to figure out.Or is there a way to just create a default preprocessor and add my own call back function to it. And then pass the preprocessor object to the Parser and invoke the parser just by supplying a filename.
*****************************************/  TrackMacro track_macro;  PP.addPPCallbacks(&track_macro);
   MyASTAction* Act = new MyASTAction();   Clang.ExecuteAction(*Act);
return 0;}

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