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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 "lauxlib.h"
static FILE* LOG; /* log file */
static int I=0; /* indentation level */
static void hook(lua_State *L, lua_Debug *ar)
{
const char* s="";
switch (ar->event)
{
case LUA_HOOKTAILRET: ar->event=LUA_HOOKRET;
case LUA_HOOKRET: s="return"; break;
case LUA_HOOKCALL: s="call"; break;
case LUA_HOOKLINE: s="line"; break;
default: break;
}
fprintf(LOG,"[%d]\t%*s%s\t-- %d\n",I,I,"",s,ar->currentline);
if (ar->event==LUA_HOOKCALL) ++I; else if (ar->event==LUA_HOOKRET) --I;
}
static void start_trace(lua_State *L, FILE* logfile)
{
lua_sethook(L,hook,LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE, 0);
LOG=logfile;
}
static void stop_trace(lua_State *L)
{
lua_sethook(L,NULL,0,0);
fclose(LOG);
}
int main(void)
{
int rc;
lua_State *L=lua_open();
lua_baselibopen(L);
lua_tablibopen(L);
lua_iolibopen(L);
lua_strlibopen(L);
lua_mathlibopen(L);
lua_dblibopen(L);
start_trace(L,stderr);
rc=lua_dofile(L,NULL);
stop_trace(L);
return rc;
}
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