2
** $Id: ldblib.c,v 1.132 2012/01/19 20:14:44 roberto Exp $
3
** Interface from Lua to its debug API
4
** See Copyright Notice in lua.h
21
#define HOOKKEY "_HKEY"
25
static int db_getregistry (lua_State *L) {
26
lua_pushvalue(L, LUA_REGISTRYINDEX);
31
static int db_getmetatable (lua_State *L) {
33
if (!lua_getmetatable(L, 1)) {
34
lua_pushnil(L); /* no metatable */
40
static int db_setmetatable (lua_State *L) {
41
int t = lua_type(L, 2);
42
luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
43
"nil or table expected");
45
lua_setmetatable(L, 1);
46
return 1; /* return 1st argument */
50
static int db_getuservalue (lua_State *L) {
51
if (lua_type(L, 1) != LUA_TUSERDATA)
54
lua_getuservalue(L, 1);
59
static int db_setuservalue (lua_State *L) {
60
if (lua_type(L, 1) == LUA_TLIGHTUSERDATA)
61
luaL_argerror(L, 1, "full userdata expected, got light userdata");
62
luaL_checktype(L, 1, LUA_TUSERDATA);
63
if (!lua_isnoneornil(L, 2))
64
luaL_checktype(L, 2, LUA_TTABLE);
66
lua_setuservalue(L, 1);
71
static void settabss (lua_State *L, const char *i, const char *v) {
73
lua_setfield(L, -2, i);
77
static void settabsi (lua_State *L, const char *i, int v) {
78
lua_pushinteger(L, v);
79
lua_setfield(L, -2, i);
83
static void settabsb (lua_State *L, const char *i, int v) {
84
lua_pushboolean(L, v);
85
lua_setfield(L, -2, i);
89
static lua_State *getthread (lua_State *L, int *arg) {
90
if (lua_isthread(L, 1)) {
92
return lua_tothread(L, 1);
101
static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
103
lua_pushvalue(L, -2);
108
lua_setfield(L, -2, fname);
112
static int db_getinfo (lua_State *L) {
115
lua_State *L1 = getthread(L, &arg);
116
const char *options = luaL_optstring(L, arg+2, "flnStu");
117
if (lua_isnumber(L, arg+1)) {
118
if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
119
lua_pushnil(L); /* level out of range */
123
else if (lua_isfunction(L, arg+1)) {
124
lua_pushfstring(L, ">%s", options);
125
options = lua_tostring(L, -1);
126
lua_pushvalue(L, arg+1);
130
return luaL_argerror(L, arg+1, "function or level expected");
131
if (!lua_getinfo(L1, options, &ar))
132
return luaL_argerror(L, arg+2, "invalid option");
133
lua_createtable(L, 0, 2);
134
if (strchr(options, 'S')) {
135
settabss(L, "source", ar.source);
136
settabss(L, "short_src", ar.short_src);
137
settabsi(L, "linedefined", ar.linedefined);
138
settabsi(L, "lastlinedefined", ar.lastlinedefined);
139
settabss(L, "what", ar.what);
141
if (strchr(options, 'l'))
142
settabsi(L, "currentline", ar.currentline);
143
if (strchr(options, 'u')) {
144
settabsi(L, "nups", ar.nups);
145
settabsi(L, "nparams", ar.nparams);
146
settabsb(L, "isvararg", ar.isvararg);
148
if (strchr(options, 'n')) {
149
settabss(L, "name", ar.name);
150
settabss(L, "namewhat", ar.namewhat);
152
if (strchr(options, 't'))
153
settabsb(L, "istailcall", ar.istailcall);
154
if (strchr(options, 'L'))
155
treatstackoption(L, L1, "activelines");
156
if (strchr(options, 'f'))
157
treatstackoption(L, L1, "func");
158
return 1; /* return table */
162
static int db_getlocal (lua_State *L) {
164
lua_State *L1 = getthread(L, &arg);
167
int nvar = luaL_checkint(L, arg+2); /* local-variable index */
168
if (lua_isfunction(L, arg + 1)) { /* function argument? */
169
lua_pushvalue(L, arg + 1); /* push function */
170
lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */
173
else { /* stack-level argument */
174
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
175
return luaL_argerror(L, arg+1, "level out of range");
176
name = lua_getlocal(L1, &ar, nvar);
178
lua_xmove(L1, L, 1); /* push local value */
179
lua_pushstring(L, name); /* push name */
180
lua_pushvalue(L, -2); /* re-order */
184
lua_pushnil(L); /* no name (nor value) */
191
static int db_setlocal (lua_State *L) {
193
lua_State *L1 = getthread(L, &arg);
195
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
196
return luaL_argerror(L, arg+1, "level out of range");
197
luaL_checkany(L, arg+3);
198
lua_settop(L, arg+3);
200
lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
205
static int auxupvalue (lua_State *L, int get) {
207
int n = luaL_checkint(L, 2);
208
luaL_checktype(L, 1, LUA_TFUNCTION);
209
name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
210
if (name == NULL) return 0;
211
lua_pushstring(L, name);
212
lua_insert(L, -(get+1));
217
static int db_getupvalue (lua_State *L) {
218
return auxupvalue(L, 1);
222
static int db_setupvalue (lua_State *L) {
224
return auxupvalue(L, 0);
228
static int checkupval (lua_State *L, int argf, int argnup) {
230
int nup = luaL_checkint(L, argnup);
231
luaL_checktype(L, argf, LUA_TFUNCTION);
232
lua_pushvalue(L, argf);
233
lua_getinfo(L, ">u", &ar);
234
luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index");
239
static int db_upvalueid (lua_State *L) {
240
int n = checkupval(L, 1, 2);
241
lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
246
static int db_upvaluejoin (lua_State *L) {
247
int n1 = checkupval(L, 1, 2);
248
int n2 = checkupval(L, 3, 4);
249
luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
250
luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
251
lua_upvaluejoin(L, 1, n1, 3, n2);
256
#define gethooktable(L) luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)
259
static void hookf (lua_State *L, lua_Debug *ar) {
260
static const char *const hooknames[] =
261
{"call", "return", "line", "count", "tail call"};
265
if (lua_isfunction(L, -1)) {
266
lua_pushstring(L, hooknames[(int)ar->event]);
267
if (ar->currentline >= 0)
268
lua_pushinteger(L, ar->currentline);
270
lua_assert(lua_getinfo(L, "lS", ar));
276
static int makemask (const char *smask, int count) {
278
if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
279
if (strchr(smask, 'r')) mask |= LUA_MASKRET;
280
if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
281
if (count > 0) mask |= LUA_MASKCOUNT;
286
static char *unmakemask (int mask, char *smask) {
288
if (mask & LUA_MASKCALL) smask[i++] = 'c';
289
if (mask & LUA_MASKRET) smask[i++] = 'r';
290
if (mask & LUA_MASKLINE) smask[i++] = 'l';
296
static int db_sethook (lua_State *L) {
297
int arg, mask, count;
299
lua_State *L1 = getthread(L, &arg);
300
if (lua_isnoneornil(L, arg+1)) {
301
lua_settop(L, arg+1);
302
func = NULL; mask = 0; count = 0; /* turn off hooks */
305
const char *smask = luaL_checkstring(L, arg+2);
306
luaL_checktype(L, arg+1, LUA_TFUNCTION);
307
count = luaL_optint(L, arg+3, 0);
308
func = hookf; mask = makemask(smask, count);
310
if (gethooktable(L) == 0) { /* creating hook table? */
311
lua_pushstring(L, "k");
312
lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */
313
lua_pushvalue(L, -1);
314
lua_setmetatable(L, -2); /* setmetatable(hooktable) = hooktable */
316
lua_pushthread(L1); lua_xmove(L1, L, 1);
317
lua_pushvalue(L, arg+1);
318
lua_rawset(L, -3); /* set new hook */
319
lua_sethook(L1, func, mask, count); /* set hooks */
324
static int db_gethook (lua_State *L) {
326
lua_State *L1 = getthread(L, &arg);
328
int mask = lua_gethookmask(L1);
329
lua_Hook hook = lua_gethook(L1);
330
if (hook != NULL && hook != hookf) /* external hook? */
331
lua_pushliteral(L, "external hook");
334
lua_pushthread(L1); lua_xmove(L1, L, 1);
335
lua_rawget(L, -2); /* get hook */
336
lua_remove(L, -2); /* remove hook table */
338
lua_pushstring(L, unmakemask(mask, buff));
339
lua_pushinteger(L, lua_gethookcount(L1));
344
static int db_debug (lua_State *L) {
347
luai_writestringerror("%s", "lua_debug> ");
348
if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
349
strcmp(buffer, "cont\n") == 0)
351
if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
352
lua_pcall(L, 0, 0, 0))
353
luai_writestringerror("%s\n", lua_tostring(L, -1));
354
lua_settop(L, 0); /* remove eventual returns */
359
static int db_traceback (lua_State *L) {
361
lua_State *L1 = getthread(L, &arg);
362
const char *msg = lua_tostring(L, arg + 1);
363
if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */
364
lua_pushvalue(L, arg + 1); /* return it untouched */
366
int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);
367
luaL_traceback(L, L1, msg, level);
373
static const luaL_Reg dblib[] = {
375
{"getuservalue", db_getuservalue},
376
{"gethook", db_gethook},
377
{"getinfo", db_getinfo},
378
{"getlocal", db_getlocal},
379
{"getregistry", db_getregistry},
380
{"getmetatable", db_getmetatable},
381
{"getupvalue", db_getupvalue},
382
{"upvaluejoin", db_upvaluejoin},
383
{"upvalueid", db_upvalueid},
384
{"setuservalue", db_setuservalue},
385
{"sethook", db_sethook},
386
{"setlocal", db_setlocal},
387
{"setmetatable", db_setmetatable},
388
{"setupvalue", db_setupvalue},
389
{"traceback", db_traceback},
394
LUAMOD_API int luaopen_debug (lua_State *L) {
395
luaL_newlib(L, dblib);