Aspect C ++ trace function of control flow and input output parameters

Question

I use aspectC ++ to generate a program control flow.

trace.ah :

  #ifndef __trace_ah__ #define __trace_ah__ #include <cstdio> // Control flow tracing example aspect trace { // print the function name before execution starts pointcut virtual methods() = "% ...::%(...)"; advice execution (methods()) : before () { cout << "entering: " << JoinPoint::signature() << endl; // print input parameters** } advice execution(methods()) : after() { // print output parameters** cout << "leaving: " << JoinPoint::signature() << endl; } //prints return values of non void functions advice execution("% ...::%(...)" && !"void ...::%(...)") : after() { JoinPoint::Result res = *tjp->result(); cout << "leaving " << tjp->signature()<< " << returning value--" << res<<endl; } }; }; #endif 

Question:

1. How to print the variables themselves, passed as arguments to the functions?

2.How to print input parameter values ​​for each function?

Answer 1

 #ifndef __trace_ah__ #define __trace_ah__ #include <cstdio> #include <iostream> using namespace std; template <int I> struct ArgPrinter { template <class JP> static inline void work (JP &tjp) { ArgPrinter<I - 1>::work (tjp); cout << "Arg " << I << ": " << *tjp.template arg<I - 1> () << endl; } }; template <> struct ArgPrinter<0> { template <class JP> static inline void work (JP &tjp) {} }; // Control flow tracing example aspect trace { pointcut virtual methods() = "% ...::%(...)"; template <class JP> void print_args (JP &tjp) { ArgPrinter<JP::ARGS>::work (tjp); } advice execution (methods()) : before () { cout << "entering: " << JoinPoint::signature() << endl; tjp->arg(0); print_args (*tjp); } advice execution("% ...::%(...)" && !"void ...::%(...)") : after() { JoinPoint::Result res = *tjp->result(); cout << "leaving " << tjp->signature()<< " << returning value--" << res<<endl; } }; #endif