etc/trace.c

   1 /*
   2 * trace.c
   3 * a simple execution tracer for Lua
   4 */
   5
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include "lua.h"
   9 #include "luadebug.h"
  10
  11 static FILE* LOG;               /* output file */
  12 static int L=0;                 /* indentation level */
  13
  14 static void linehook(int line)
  15 {
  16  fprintf(LOG,"%*sLINE(%d)\t-- %d\n",L,"",line,L);
  17 }
  18
  19 static void callhook(lua_Function func, char* file, int line)
  20 {
  21  fprintf(LOG,"%*sCALL('%s',%d)\t-- %d\n",L,"",file,line,L);
  22  if (line==0 && strcmp(file,"(return)")==0) --L; else ++L;
  23 }
  24
  25 void start_trace(FILE* logfile)
  26 {
  27  lua_setlinehook(linehook);
  28  lua_setcallhook(callhook);
  29  lua_setdebug(1);
  30  LOG=logfile;
  31 }
  32
  33 void stop_trace(void)
  34 {
  35  lua_setlinehook(NULL);
  36  lua_setcallhook(NULL);
  37  lua_setdebug(0);
  38  fclose(LOG);
  39 }
  40
  41 int main(void)
  42 {
  43  int rc;
  44  lua_open();
  45  start_trace(stderr);
  46  rc=lua_dofile(0);
  47  stop_trace();
  48  return rc;
  49 }