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/*
* trace.c
* a simple execution tracer for Lua
*/
#include <stdio.h>
#include <string.h>
#include "lua.h"
#include "luadebug.h"
static FILE* LOG; /* output file */
static int L=0; /* indentation level */
static void linehook(int line)
{
fprintf(LOG,"%*sLINE(%d)\t-- %d\n",L,"",line,L);
}
static void callhook(lua_Function func, char* file, int line)
{
fprintf(LOG,"%*sCALL('%s',%d)\t-- %d\n",L,"",file,line,L);
if (line==0 && strcmp(file,"(return)")==0) --L; else ++L;
}
void start_trace(FILE* logfile)
{
lua_setlinehook(linehook);
lua_setcallhook(callhook);
lua_setdebug(1);
LOG=logfile;
}
void stop_trace(void)
{
lua_setlinehook(NULL);
lua_setcallhook(NULL);
lua_setdebug(0);
fclose(LOG);
}
int main(void)
{
int rc;
lua_open();
start_trace(stderr);
rc=lua_dofile(0);
stop_trace();
return rc;
}
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