/script_binding/lua/lua/ldblib.c
C | 397 lines | 330 code | 61 blank | 6 comment | 75 complexity | 02e4c11fecbdf5466991910c50b549f7 MD5 | raw file
1/* 2** $Id: ldblib.c,v 1.104.1.3 2008/01/21 13:11:21 roberto Exp $ 3** Interface from Lua to its debug API 4** See Copyright Notice in lua.h 5*/ 6 7 8#include <stdio.h> 9#include <stdlib.h> 10#include <string.h> 11 12#define ldblib_c 13#define LUA_LIB 14 15#include "lua.h" 16 17#include "lauxlib.h" 18#include "lualib.h" 19 20 21 22static int db_getregistry (lua_State *L) { 23 lua_pushvalue(L, LUA_REGISTRYINDEX); 24 return 1; 25} 26 27 28static int db_getmetatable (lua_State *L) { 29 luaL_checkany(L, 1); 30 if (!lua_getmetatable(L, 1)) { 31 lua_pushnil(L); /* no metatable */ 32 } 33 return 1; 34} 35 36 37static int db_setmetatable (lua_State *L) { 38 int t = lua_type(L, 2); 39 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, 40 "nil or table expected"); 41 lua_settop(L, 2); 42 lua_pushboolean(L, lua_setmetatable(L, 1)); 43 return 1; 44} 45 46 47static int db_getfenv (lua_State *L) { 48 lua_getfenv(L, 1); 49 return 1; 50} 51 52 53static int db_setfenv (lua_State *L) { 54 luaL_checktype(L, 2, LUA_TTABLE); 55 lua_settop(L, 2); 56 if (lua_setfenv(L, 1) == 0) 57 luaL_error(L, LUA_QL("setfenv") 58 " cannot change environment of given object"); 59 return 1; 60} 61 62 63static void settabss (lua_State *L, const char *i, const char *v) { 64 lua_pushstring(L, v); 65 lua_setfield(L, -2, i); 66} 67 68 69static void settabsi (lua_State *L, const char *i, int v) { 70 lua_pushinteger(L, v); 71 lua_setfield(L, -2, i); 72} 73 74 75static lua_State *getthread (lua_State *L, int *arg) { 76 if (lua_isthread(L, 1)) { 77 *arg = 1; 78 return lua_tothread(L, 1); 79 } 80 else { 81 *arg = 0; 82 return L; 83 } 84} 85 86 87static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) { 88 if (L == L1) { 89 lua_pushvalue(L, -2); 90 lua_remove(L, -3); 91 } 92 else 93 lua_xmove(L1, L, 1); 94 lua_setfield(L, -2, fname); 95} 96 97 98static int db_getinfo (lua_State *L) { 99 lua_Debug ar; 100 int arg; 101 lua_State *L1 = getthread(L, &arg); 102 const char *options = luaL_optstring(L, arg+2, "flnSu"); 103 if (lua_isnumber(L, arg+1)) { 104 if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) { 105 lua_pushnil(L); /* level out of range */ 106 return 1; 107 } 108 } 109 else if (lua_isfunction(L, arg+1)) { 110 lua_pushfstring(L, ">%s", options); 111 options = lua_tostring(L, -1); 112 lua_pushvalue(L, arg+1); 113 lua_xmove(L, L1, 1); 114 } 115 else 116 return luaL_argerror(L, arg+1, "function or level expected"); 117 if (!lua_getinfo(L1, options, &ar)) 118 return luaL_argerror(L, arg+2, "invalid option"); 119 lua_createtable(L, 0, 2); 120 if (strchr(options, 'S')) { 121 settabss(L, "source", ar.source); 122 settabss(L, "short_src", ar.short_src); 123 settabsi(L, "linedefined", ar.linedefined); 124 settabsi(L, "lastlinedefined", ar.lastlinedefined); 125 settabss(L, "what", ar.what); 126 } 127 if (strchr(options, 'l')) 128 settabsi(L, "currentline", ar.currentline); 129 if (strchr(options, 'u')) 130 settabsi(L, "nups", ar.nups); 131 if (strchr(options, 'n')) { 132 settabss(L, "name", ar.name); 133 settabss(L, "namewhat", ar.namewhat); 134 } 135 if (strchr(options, 'L')) 136 treatstackoption(L, L1, "activelines"); 137 if (strchr(options, 'f')) 138 treatstackoption(L, L1, "func"); 139 return 1; /* return table */ 140} 141 142 143static int db_getlocal (lua_State *L) { 144 int arg; 145 lua_State *L1 = getthread(L, &arg); 146 lua_Debug ar; 147 const char *name; 148 if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ 149 return luaL_argerror(L, arg+1, "level out of range"); 150 name = lua_getlocal(L1, &ar, luaL_checkint(L, arg+2)); 151 if (name) { 152 lua_xmove(L1, L, 1); 153 lua_pushstring(L, name); 154 lua_pushvalue(L, -2); 155 return 2; 156 } 157 else { 158 lua_pushnil(L); 159 return 1; 160 } 161} 162 163 164static int db_setlocal (lua_State *L) { 165 int arg; 166 lua_State *L1 = getthread(L, &arg); 167 lua_Debug ar; 168 if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ 169 return luaL_argerror(L, arg+1, "level out of range"); 170 luaL_checkany(L, arg+3); 171 lua_settop(L, arg+3); 172 lua_xmove(L, L1, 1); 173 lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2))); 174 return 1; 175} 176 177 178static int auxupvalue (lua_State *L, int get) { 179 const char *name; 180 int n = luaL_checkint(L, 2); 181 luaL_checktype(L, 1, LUA_TFUNCTION); 182 if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */ 183 name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n); 184 if (name == NULL) return 0; 185 lua_pushstring(L, name); 186 lua_insert(L, -(get+1)); 187 return get + 1; 188} 189 190 191static int db_getupvalue (lua_State *L) { 192 return auxupvalue(L, 1); 193} 194 195 196static int db_setupvalue (lua_State *L) { 197 luaL_checkany(L, 3); 198 return auxupvalue(L, 0); 199} 200 201 202 203static const char KEY_HOOK = 'h'; 204 205 206static void hookf (lua_State *L, lua_Debug *ar) { 207 static const char *const hooknames[] = 208 {"call", "return", "line", "count", "tail return"}; 209 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 210 lua_rawget(L, LUA_REGISTRYINDEX); 211 lua_pushlightuserdata(L, L); 212 lua_rawget(L, -2); 213 if (lua_isfunction(L, -1)) { 214 lua_pushstring(L, hooknames[(int)ar->event]); 215 if (ar->currentline >= 0) 216 lua_pushinteger(L, ar->currentline); 217 else lua_pushnil(L); 218 lua_assert(lua_getinfo(L, "lS", ar)); 219 lua_call(L, 2, 0); 220 } 221} 222 223 224static int makemask (const char *smask, int count) { 225 int mask = 0; 226 if (strchr(smask, 'c')) mask |= LUA_MASKCALL; 227 if (strchr(smask, 'r')) mask |= LUA_MASKRET; 228 if (strchr(smask, 'l')) mask |= LUA_MASKLINE; 229 if (count > 0) mask |= LUA_MASKCOUNT; 230 return mask; 231} 232 233 234static char *unmakemask (int mask, char *smask) { 235 int i = 0; 236 if (mask & LUA_MASKCALL) smask[i++] = 'c'; 237 if (mask & LUA_MASKRET) smask[i++] = 'r'; 238 if (mask & LUA_MASKLINE) smask[i++] = 'l'; 239 smask[i] = '\0'; 240 return smask; 241} 242 243 244static void gethooktable (lua_State *L) { 245 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 246 lua_rawget(L, LUA_REGISTRYINDEX); 247 if (!lua_istable(L, -1)) { 248 lua_pop(L, 1); 249 lua_createtable(L, 0, 1); 250 lua_pushlightuserdata(L, (void *)&KEY_HOOK); 251 lua_pushvalue(L, -2); 252 lua_rawset(L, LUA_REGISTRYINDEX); 253 } 254} 255 256 257static int db_sethook (lua_State *L) { 258 int arg, mask, count; 259 lua_Hook func; 260 lua_State *L1 = getthread(L, &arg); 261 if (lua_isnoneornil(L, arg+1)) { 262 lua_settop(L, arg+1); 263 func = NULL; mask = 0; count = 0; /* turn off hooks */ 264 } 265 else { 266 const char *smask = luaL_checkstring(L, arg+2); 267 luaL_checktype(L, arg+1, LUA_TFUNCTION); 268 count = luaL_optint(L, arg+3, 0); 269 func = hookf; mask = makemask(smask, count); 270 } 271 gethooktable(L); 272 lua_pushlightuserdata(L, L1); 273 lua_pushvalue(L, arg+1); 274 lua_rawset(L, -3); /* set new hook */ 275 lua_pop(L, 1); /* remove hook table */ 276 lua_sethook(L1, func, mask, count); /* set hooks */ 277 return 0; 278} 279 280 281static int db_gethook (lua_State *L) { 282 int arg; 283 lua_State *L1 = getthread(L, &arg); 284 char buff[5]; 285 int mask = lua_gethookmask(L1); 286 lua_Hook hook = lua_gethook(L1); 287 if (hook != NULL && hook != hookf) /* external hook? */ 288 lua_pushliteral(L, "external hook"); 289 else { 290 gethooktable(L); 291 lua_pushlightuserdata(L, L1); 292 lua_rawget(L, -2); /* get hook */ 293 lua_remove(L, -2); /* remove hook table */ 294 } 295 lua_pushstring(L, unmakemask(mask, buff)); 296 lua_pushinteger(L, lua_gethookcount(L1)); 297 return 3; 298} 299 300 301static int db_debug (lua_State *L) { 302 for (;;) { 303 char buffer[250]; 304 fputs("lua_debug> ", stderr); 305 if (fgets(buffer, sizeof(buffer), stdin) == 0 || 306 strcmp(buffer, "cont\n") == 0) 307 return 0; 308 if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || 309 lua_pcall(L, 0, 0, 0)) { 310 fputs(lua_tostring(L, -1), stderr); 311 fputs("\n", stderr); 312 } 313 lua_settop(L, 0); /* remove eventual returns */ 314 } 315} 316 317 318#define LEVELS1 12 /* size of the first part of the stack */ 319#define LEVELS2 10 /* size of the second part of the stack */ 320 321static int db_errorfb (lua_State *L) { 322 int level; 323 int firstpart = 1; /* still before eventual `...' */ 324 int arg; 325 lua_State *L1 = getthread(L, &arg); 326 lua_Debug ar; 327 if (lua_isnumber(L, arg+2)) { 328 level = (int)lua_tointeger(L, arg+2); 329 lua_pop(L, 1); 330 } 331 else 332 level = (L == L1) ? 1 : 0; /* level 0 may be this own function */ 333 if (lua_gettop(L) == arg) 334 lua_pushliteral(L, ""); 335 else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */ 336 else lua_pushliteral(L, "\n"); 337 lua_pushliteral(L, "stack traceback:"); 338 while (lua_getstack(L1, level++, &ar)) { 339 if (level > LEVELS1 && firstpart) { 340 /* no more than `LEVELS2' more levels? */ 341 if (!lua_getstack(L1, level+LEVELS2, &ar)) 342 level--; /* keep going */ 343 else { 344 lua_pushliteral(L, "\n\t..."); /* too many levels */ 345 while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */ 346 level++; 347 } 348 firstpart = 0; 349 continue; 350 } 351 lua_pushliteral(L, "\n\t"); 352 lua_getinfo(L1, "Snl", &ar); 353 lua_pushfstring(L, "%s:", ar.short_src); 354 if (ar.currentline > 0) 355 lua_pushfstring(L, "%d:", ar.currentline); 356 if (*ar.namewhat != '\0') /* is there a name? */ 357 lua_pushfstring(L, " in function " LUA_QS, ar.name); 358 else { 359 if (*ar.what == 'm') /* main? */ 360 lua_pushfstring(L, " in main chunk"); 361 else if (*ar.what == 'C' || *ar.what == 't') 362 lua_pushliteral(L, " ?"); /* C function or tail call */ 363 else 364 lua_pushfstring(L, " in function <%s:%d>", 365 ar.short_src, ar.linedefined); 366 } 367 lua_concat(L, lua_gettop(L) - arg); 368 } 369 lua_concat(L, lua_gettop(L) - arg); 370 return 1; 371} 372 373 374static const luaL_Reg dblib[] = { 375 {"debug", db_debug}, 376 {"getfenv", db_getfenv}, 377 {"gethook", db_gethook}, 378 {"getinfo", db_getinfo}, 379 {"getlocal", db_getlocal}, 380 {"getregistry", db_getregistry}, 381 {"getmetatable", db_getmetatable}, 382 {"getupvalue", db_getupvalue}, 383 {"setfenv", db_setfenv}, 384 {"sethook", db_sethook}, 385 {"setlocal", db_setlocal}, 386 {"setmetatable", db_setmetatable}, 387 {"setupvalue", db_setupvalue}, 388 {"traceback", db_errorfb}, 389 {NULL, NULL} 390}; 391 392 393LUALIB_API int luaopen_debug (lua_State *L) { 394 luaL_register(L, LUA_DBLIBNAME, dblib); 395 return 1; 396} 397