// orignal function name was 'FunctionName'
void FunctionNameReal(...)
{
  // Do Something
}

#undef FunctionName
#define FunctionName printf("Calling FunctionName from %sn",__FUNCTION__);FunctionNameReal

#include <iostream>

int FunctionName(int one, int two)
{
  static int calls=0;
  return (++calls+one)*two;
}

#ifdef REPORT
  // class to capture the caller and print it.
  class Reporter
  {
    public:
      Reporter(std::string Caller, std::string File, int Line)
        : caller_(Caller)
        , file_(File)
        , line_(Line)
      {}

      int operator()(int one, int two)
      {
        std::cout
          << "Reporter: FunctionName() is being called by "
          << caller_ << "() in " << file_ << ":" << line_ << std::endl;
        // can use the original name here, as it is still defined
        return FunctionName(one,two);
      }
    private:
      std::string   caller_;
      std::string   file_;
      int           line_;

  };

// remove the symbol for the function, then define a new version that instead
// creates a stack temporary instance of Reporter initialized with the caller
#  undef FunctionName
#  define FunctionName Reporter(__FUNCTION__,__FILE__,__LINE__)
#endif


void Caller1()
{
  int val = FunctionName(7,9);  // <-- works for captured return value
  std::cout << "Mystery Function got " << val << std::endl;
}

void Caller2()
{
  // Works for inline as well.
  std::cout << "Mystery Function got " << FunctionName(11,13) << std::endl;
}

int main(int argc, char** argv)
{
  Caller1();
  Caller2();
  return 0;
}

Reporter: FunctionName() is being called by Caller1() in test.cpp:44
Mystery Function got 72
Reporter: FunctionName() is being called by Caller2() in test.cpp:51
Mystery Function got 169

void Caller2()
{
  std::cout << "Mystery Function got " << Reporter(__FUNCTION__,"test.cpp",51)(11,13) << std::endl;
}

#include <iostream>

class ClassName
{
  public:
    explicit ClassName(int Member)
      : member_(Member)
      {}

    int FunctionName(int one, int two)
    {
      return (++member_+one)*two;
    }

  private:
    int member_;
};

#ifdef REPORT
  // class to capture the caller and print it.
  class ClassNameDecorator
  {
    public:
      ClassNameDecorator( int Member)
        : className_(Member)
      {}

      ClassNameDecorator& FunctionName(std::string Caller, std::string File, int Line)
      {
        std::cout
          << "Reporter: ClassName::FunctionName() is being called by "
          << Caller << "() in " << File << ":" << Line << std::endl;
        return *this;
      }
      int operator()(int one, int two)
      {
        return className_.FunctionName(one,two);
      }
    private:
      ClassName className_;
  };


// remove the symbol for the function, then define a new version that instead
// creates a stack temporary instance of ClassNameDecorator.
// FunctionName is then replaced with a version that takes the caller information
// and uses Method Chaining to allow operator() to be invoked with the original
// parameters.
#  undef ClassName
#  define ClassName ClassNameDecorator
#  undef FunctionName
#  define FunctionName FunctionName(__FUNCTION__,__FILE__,__LINE__)
#endif


void Caller1()
{
  ClassName foo(21);
  int val = foo.FunctionName(7,9);  // <-- works for captured return value
  std::cout << "Mystery Function got " << val << std::endl;
}

void Caller2()
{
  ClassName foo(42);
  // Works for inline as well.
  std::cout << "Mystery Function got " << foo.FunctionName(11,13) << std::endl;
}

int main(int argc, char** argv)
{
  Caller1();
  Caller2();
  return 0;
}

Reporter: ClassName::FunctionName() is being called by Caller1() in test.cpp:56
Mystery Function got 261
Reporter: ClassName::FunctionName() is being called by Caller2() in test.cpp:64
Mystery Function got 702

#include <cstdio>

void foobar(const char* str = __builtin_FUNCTION()){
    std::printf("called by %sn", str);
}

int main(){
    foobar();
    return 0;
}

called by main

// What: Track last few lines in loci of control, gpl/moshahmed_at_gmail
// Test: gcc -Wall -g -lm -std=c11 track.c
#include <stdio.h>
#include <string.h>

#define _DEBUG
#ifdef _DEBUG
#define lsize 255 /* const int lsize=255; -- C++ */
struct locs {
  int   line[lsize];
  char *file[lsize];
  char *func[lsize];
  int  cur; /* cur=0; C++ */
} locs;

#define track do {
      locs.line[locs.cur]=__LINE__ ;
      locs.file[locs.cur]=(char*)__FILE__ ;
      locs.func[locs.cur]=(char*) __builtin_FUNCTION() /* __PRETTY_FUNCTION__ -- C++ */ ;
      locs.cur=(locs.cur+1) % lsize;
  } while(0);

void track_start(){
  memset(&locs,0, sizeof locs);
}

void track_print(){
  int i, k;
  for (i=0; i<lsize; i++){
    k = (locs.cur+i) % lsize;
    if (locs.file[k]){
      fprintf(stderr,"%d: %s:%d %sn",
        k, locs.file[k],
        locs.line[k], locs.func[k]);
    }
  }
}
#else
#define track       do {} while(0)
#define track_start() (void)0
#define track_print() (void)0
#endif


// Sample usage.
void bar(){ track ; }
void foo(){ track ; bar(); }

int main(){
  int k;
  track_start();
  for (k=0;k<2;k++)
    foo();
  track;
  track_print();
  return 0;
}