/*
** $Id: ldebug.c,v 2.29.1.6 2008/05/08 16:56:26 roberto Exp $
** Debug Interface
** See Copyright Notice in lua.h
*/
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#define ldebug_c
#define LUA_CORE
#include "lua.h"
#include "lapi.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "lvm.h"
static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
static int currentpc (lua_State *L, CallInfo *ci) {
if (!isLua(ci)) return -1; /* function is not a Lua function? */
if (ci == L->ci)
ci->savedpc = L->savedpc;
return pcRel(ci->savedpc, ci_func(ci)->l.p);
}
static int currentline (lua_State *L, CallInfo *ci) {
int pc = currentpc(L, ci);
if (pc < 0)
return -1; /* only active lua functions have current-line information */
else
return getline(ci_func(ci)->l.p, pc);
}
/*
** this function can be called asynchronous (e.g. during a signal)
*/
LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
if (func == NULL || mask == 0) { /* turn off hooks? */
mask = 0;
func = NULL;
}
L->hook = func;
L->basehookcount = count;
resethookcount(L);
L->hookmask = cast_byte(mask);
return 1;
}
LUA_API lua_Hook lua_gethook (lua_State *L) {
return L->hook;
}
LUA_API int lua_gethookmask (lua_State *L) {
return L->hookmask;
}
LUA_API int lua_gethookcount (lua_State *L) {
return L->basehookcount;
}
LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
int status;
CallInfo *ci;
lua_lock(L);
for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
level--;
if (f_isLua(ci)) /* Lua function? */
level -= ci->tailcalls; /* skip lost tail calls */
}
if (level == 0 && ci > L->base_ci) { /* level found? */
status = 1;
ar->i_ci = cast_int(ci - L->base_ci);
}
else if (level < 0) { /* level is of a lost tail call? */
status = 1;
ar->i_ci = 0;
}
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