1 /* $NetBSD: ldblib.c,v 1.1.1.1 2010/10/31 11:16:55 mbalmer Exp $ */ 2 3 /* 4 ** Id: ldblib.c,v 1.104.1.3 2008/01/21 13:11:21 roberto Exp 5 ** Interface from Lua to its debug API 6 ** See Copyright Notice in lua.h 7 */ 8 9 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include <string.h> 13 14 #define ldblib_c 15 #define LUA_LIB 16 17 #include "lua.h" 18 19 #include "lauxlib.h" 20 #include "lualib.h" 21 22 23 24 static int db_getregistry (lua_State *L) { 25 lua_pushvalue(L, LUA_REGISTRYINDEX); 26 return 1; 27 } 28 29 30 static int db_getmetatable (lua_State *L) { 31 luaL_checkany(L, 1); 32 if (!lua_getmetatable(L, 1)) { 33 lua_pushnil(L); /* no metatable */ 34 } 35 return 1; 36 } 37 38 39 static int db_setmetatable (lua_State *L) { 40 int t = lua_type(L, 2); 41 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, 42 "nil or table expected"); 43 lua_settop(L, 2); 44 lua_pushboolean(L, lua_setmetatable(L, 1)); 45 return 1; 46 } 47 48 49 static int db_getfenv (lua_State *L) { 50 lua_getfenv(L, 1); 51 return 1; 52 } 53 54 55 static int db_setfenv (lua_State *L) { 56 luaL_checktype(L, 2, LUA_TTABLE); 57 lua_settop(L, 2); 58 if (lua_setfenv(L, 1) == 0) 59 luaL_error(L, LUA_QL("setfenv") 60 " cannot change environment of given object"); 61 return 1; 62 } 63 64 65 static void settabss (lua_State *L, const char *i, const char *v) { 66 lua_pushstring(L, v); 67 lua_setfield(L, -2, i); 68 } 69 70 71 static void settabsi (lua_State *L, const char *i, int v) { 72 lua_pushinteger(L, v); 73 lua_setfield(L, -2, i); 74 } 75 76 77 static lua_State *getthread (lua_State *L, int *arg) { 78 if (lua_isthread(L, 1)) { 79 *arg = 1; 80 return lua_tothread(L, 1); 81 } 82 else { 83 *arg = 0; 84 return L; 85 } 86 } 87 88 89 static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) { 90 if (L == L1) { 91 lua_pushvalue(L, -2); 92 lua_remove(L, -3); 93 } 94 else 95 lua_xmove(L1, L, 1); 96 lua_setfield(L, -2, fname); 97 } 98 99 100 static int db_getinfo (lua_State *L) { 101 lua_Debug ar; 102 int arg; 103 lua_State *L1 = getthread(L, &arg); 104 const char *options = luaL_optstring(L, arg+2, "flnSu"); 105 if (lua_isnumber(L, arg+1)) { 106 if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) { 107 lua_pushnil(L); /* level out of range */ 108 return 1; 109 } 110 } 111 else if (lua_isfunction(L, arg+1)) { 112 lua_pushfstring(L, ">%s", options); 113 options = lua_tostring(L, -1); 114 lua_pushvalue(L, arg+1); 115 lua_xmove(L, L1, 1); 116 } 117 else 118 return luaL_argerror(L, arg+1, "function or level expected"); 119 if (!lua_getinfo(L1, options, &ar)) 120 return luaL_argerror(L, arg+2, "invalid option"); 121 lua_createtable(L, 0, 2); 122 if (strchr(options, 'S')) { 123 settabss(L, "source", ar.source); 124 settabss(L, "short_src", ar.short_src); 125 settabsi(L, "linedefined", ar.linedefined); 126 settabsi(L, "lastlinedefined", ar.lastlinedefined); 127 settabss(L, "what", ar.what); 128 } 129 if (strchr(options, 'l')) 130 settabsi(L, "currentline", ar.currentline); 131 if (strchr(options, 'u')) 132 settabsi(L, "nups", ar.nups); 133 if (strchr(options, 'n')) { 134 settabss(L, "name", ar.name); 135 settabss(L, "namewhat", ar.namewhat); 136 } 137 if (strchr(options, 'L')) 138 treatstackoption(L, L1, "activelines"); 139 if (strchr(options, 'f')) 140 treatstackoption(L, L1, "func"); 141 return 1; /* return table */ 142 } 143 144 145 static int db_getlocal (lua_State *L) { 146 int arg; 147 lua_State *L1 = getthread(L, &arg); 148 lua_Debug ar; 149 const char *name; 150 if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ 151 return luaL_argerror(L, arg+1, "level out of range"); 152 name = lua_getlocal(L1, &ar, luaL_checkint(L, arg+2)); 153 if (name) { 154 lua_xmove(L1, L, 1); 155 lua_pushstring(L, name); 156 lua_pushvalue(L, -2); 157 return 2; 158 } 159 else { 160 lua_pushnil(L); 161 return 1; 162 } 163 } 164 165 166 static int db_setlocal (lua_State *L) { 167 int arg; 168 lua_State *L1 = getthread(L, &arg); 169 lua_Debug ar; 170 if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ 171 return luaL_argerror(L, arg+1, "level out of range"); 172 luaL_checkany(L, arg+3); 173 lua_settop(L, arg+3); 174 lua_xmove(L, L1, 1); 175 lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2))); 176 return 1; 177 } 178 179 180 static int auxupvalue (lua_State *L, int get) { 181 const char *name; 182 int n = luaL_checkint(L, 2); 183 luaL_checktype(L, 1, LUA_TFUNCTION); 184 if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */ 185 name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n); 186 if (name == NULL) return 0; 187 lua_pushstring(L, name); 188 lua_insert(L, -(get+1)); 189 return get + 1; 190 } 191 192 193 static int db_getupvalue (lua_State *L) { 194 return auxupvalue(L, 1); 195 } 196 197 198 static int db_setupvalue (lua_State *L) { 199 luaL_checkany(L, 3); 200 return auxupvalue(L, 0); 201 } 202 203 204 205 static const char KEY_HOOK = 'h'; 206 207 208 static void hookf (lua_State *L, lua_Debug *ar) { 209 static const char *const hooknames[] = 210 {"call", "return", "line", "count", "tail return"}; 211 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 212 lua_rawget(L, LUA_REGISTRYINDEX); 213 lua_pushlightuserdata(L, L); 214 lua_rawget(L, -2); 215 if (lua_isfunction(L, -1)) { 216 lua_pushstring(L, hooknames[(int)ar->event]); 217 if (ar->currentline >= 0) 218 lua_pushinteger(L, ar->currentline); 219 else lua_pushnil(L); 220 lua_assert(lua_getinfo(L, "lS", ar)); 221 lua_call(L, 2, 0); 222 } 223 } 224 225 226 static int makemask (const char *smask, int count) { 227 int mask = 0; 228 if (strchr(smask, 'c')) mask |= LUA_MASKCALL; 229 if (strchr(smask, 'r')) mask |= LUA_MASKRET; 230 if (strchr(smask, 'l')) mask |= LUA_MASKLINE; 231 if (count > 0) mask |= LUA_MASKCOUNT; 232 return mask; 233 } 234 235 236 static char *unmakemask (int mask, char *smask) { 237 int i = 0; 238 if (mask & LUA_MASKCALL) smask[i++] = 'c'; 239 if (mask & LUA_MASKRET) smask[i++] = 'r'; 240 if (mask & LUA_MASKLINE) smask[i++] = 'l'; 241 smask[i] = '\0'; 242 return smask; 243 } 244 245 246 static void gethooktable (lua_State *L) { 247 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 248 lua_rawget(L, LUA_REGISTRYINDEX); 249 if (!lua_istable(L, -1)) { 250 lua_pop(L, 1); 251 lua_createtable(L, 0, 1); 252 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 253 lua_pushvalue(L, -2); 254 lua_rawset(L, LUA_REGISTRYINDEX); 255 } 256 } 257 258 259 static int db_sethook (lua_State *L) { 260 int arg, mask, count; 261 lua_Hook func; 262 lua_State *L1 = getthread(L, &arg); 263 if (lua_isnoneornil(L, arg+1)) { 264 lua_settop(L, arg+1); 265 func = NULL; mask = 0; count = 0; /* turn off hooks */ 266 } 267 else { 268 const char *smask = luaL_checkstring(L, arg+2); 269 luaL_checktype(L, arg+1, LUA_TFUNCTION); 270 count = luaL_optint(L, arg+3, 0); 271 func = hookf; mask = makemask(smask, count); 272 } 273 gethooktable(L); 274 lua_pushlightuserdata(L, L1); 275 lua_pushvalue(L, arg+1); 276 lua_rawset(L, -3); /* set new hook */ 277 lua_pop(L, 1); /* remove hook table */ 278 lua_sethook(L1, func, mask, count); /* set hooks */ 279 return 0; 280 } 281 282 283 static int db_gethook (lua_State *L) { 284 int arg; 285 lua_State *L1 = getthread(L, &arg); 286 char buff[5]; 287 int mask = lua_gethookmask(L1); 288 lua_Hook hook = lua_gethook(L1); 289 if (hook != NULL && hook != hookf) /* external hook? */ 290 lua_pushliteral(L, "external hook"); 291 else { 292 gethooktable(L); 293 lua_pushlightuserdata(L, L1); 294 lua_rawget(L, -2); /* get hook */ 295 lua_remove(L, -2); /* remove hook table */ 296 } 297 lua_pushstring(L, unmakemask(mask, buff)); 298 lua_pushinteger(L, lua_gethookcount(L1)); 299 return 3; 300 } 301 302 303 static int db_debug (lua_State *L) { 304 for (;;) { 305 char buffer[250]; 306 fputs("lua_debug> ", stderr); 307 if (fgets(buffer, sizeof(buffer), stdin) == 0 || 308 strcmp(buffer, "cont\n") == 0) 309 return 0; 310 if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || 311 lua_pcall(L, 0, 0, 0)) { 312 fputs(lua_tostring(L, -1), stderr); 313 fputs("\n", stderr); 314 } 315 lua_settop(L, 0); /* remove eventual returns */ 316 } 317 } 318 319 320 #define LEVELS1 12 /* size of the first part of the stack */ 321 #define LEVELS2 10 /* size of the second part of the stack */ 322 323 static int db_errorfb (lua_State *L) { 324 int level; 325 int firstpart = 1; /* still before eventual `...' */ 326 int arg; 327 lua_State *L1 = getthread(L, &arg); 328 lua_Debug ar; 329 if (lua_isnumber(L, arg+2)) { 330 level = (int)lua_tointeger(L, arg+2); 331 lua_pop(L, 1); 332 } 333 else 334 level = (L == L1) ? 1 : 0; /* level 0 may be this own function */ 335 if (lua_gettop(L) == arg) 336 lua_pushliteral(L, ""); 337 else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */ 338 else lua_pushliteral(L, "\n"); 339 lua_pushliteral(L, "stack traceback:"); 340 while (lua_getstack(L1, level++, &ar)) { 341 if (level > LEVELS1 && firstpart) { 342 /* no more than `LEVELS2' more levels? */ 343 if (!lua_getstack(L1, level+LEVELS2, &ar)) 344 level--; /* keep going */ 345 else { 346 lua_pushliteral(L, "\n\t..."); /* too many levels */ 347 while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */ 348 level++; 349 } 350 firstpart = 0; 351 continue; 352 } 353 lua_pushliteral(L, "\n\t"); 354 lua_getinfo(L1, "Snl", &ar); 355 lua_pushfstring(L, "%s:", ar.short_src); 356 if (ar.currentline > 0) 357 lua_pushfstring(L, "%d:", ar.currentline); 358 if (*ar.namewhat != '\0') /* is there a name? */ 359 lua_pushfstring(L, " in function " LUA_QS, ar.name); 360 else { 361 if (*ar.what == 'm') /* main? */ 362 lua_pushfstring(L, " in main chunk"); 363 else if (*ar.what == 'C' || *ar.what == 't') 364 lua_pushliteral(L, " ?"); /* C function or tail call */ 365 else 366 lua_pushfstring(L, " in function <%s:%d>", 367 ar.short_src, ar.linedefined); 368 } 369 lua_concat(L, lua_gettop(L) - arg); 370 } 371 lua_concat(L, lua_gettop(L) - arg); 372 return 1; 373 } 374 375 376 static const luaL_Reg dblib[] = { 377 {"debug", db_debug}, 378 {"getfenv", db_getfenv}, 379 {"gethook", db_gethook}, 380 {"getinfo", db_getinfo}, 381 {"getlocal", db_getlocal}, 382 {"getregistry", db_getregistry}, 383 {"getmetatable", db_getmetatable}, 384 {"getupvalue", db_getupvalue}, 385 {"setfenv", db_setfenv}, 386 {"sethook", db_sethook}, 387 {"setlocal", db_setlocal}, 388 {"setmetatable", db_setmetatable}, 389 {"setupvalue", db_setupvalue}, 390 {"traceback", db_errorfb}, 391 {NULL, NULL} 392 }; 393 394 395 LUALIB_API int luaopen_debug (lua_State *L) { 396 luaL_register(L, LUA_DBLIBNAME, dblib); 397 return 1; 398 } 399 400