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/*
* trace.c
* a simple execution tracer for Lua
*/
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "lualib.h"
#include "luadebug.h"
lua_State *lua_state = NULL;
#define L lua_state /* lazy! */
static FILE* LOG; /* output file */
static int I=0; /* indentation level */
static void linehook(lua_State *L, lua_Debug *ar)
{
fprintf(LOG,"%*sdo_line(%d)\t-- %d\n",I,"",ar->currentline,I);
}
static void callhook(lua_State *L, lua_Debug *ar)
{
fprintf(LOG,"%*sdo_%s\t-- %p %d\n",I,"",ar->event,ar->_func,I);
if (*ar->event=='r') --I; else ++I;
}
void start_trace(FILE* logfile)
{
lua_setlinehook(L,linehook);
lua_setcallhook(L,callhook);
LOG=logfile;
}
void stop_trace(void)
{
lua_setlinehook(L,NULL);
lua_setcallhook(L,NULL);
fclose(LOG);
}
int main(void)
{
int rc;
L=lua_open(0);
lua_baselibopen(L);
lua_iolibopen(L);
lua_strlibopen(L);
lua_mathlibopen(L);
lua_dblibopen(L);
start_trace(stderr);
rc=lua_dofile(L,0);
stop_trace();
return rc;
}
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