/* ** $Id: ldblib.c,v 1.66 2002/08/06 18:01:50 roberto Exp roberto $ ** Interface from Lua to its debug API ** See Copyright Notice in lua.h */ #include #include #include #include "lua.h" #include "lauxlib.h" #include "lualib.h" static void settabss (lua_State *L, const char *i, const char *v) { lua_pushstring(L, i); lua_pushstring(L, v); lua_rawset(L, -3); } static void settabsi (lua_State *L, const char *i, int v) { lua_pushstring(L, i); lua_pushnumber(L, v); lua_rawset(L, -3); } static int getinfo (lua_State *L) { lua_Debug ar; const char *options = luaL_opt_string(L, 2, "flnSu"); if (lua_isnumber(L, 1)) { if (!lua_getstack(L, (int)(lua_tonumber(L, 1)), &ar)) { lua_pushnil(L); /* level out of range */ return 1; } } else if (lua_isfunction(L, 1)) { lua_pushfstring(L, ">%s", options); options = lua_tostring(L, -1); lua_pushvalue(L, 1); } else return luaL_argerror(L, 1, "function or level expected"); if (!lua_getinfo(L, options, &ar)) return luaL_argerror(L, 2, "invalid option"); lua_newtable(L); for (; *options; options++) { switch (*options) { case 'S': settabss(L, "source", ar.source); settabss(L, "short_src", ar.short_src); settabsi(L, "linedefined", ar.linedefined); settabss(L, "what", ar.what); break; case 'l': settabsi(L, "currentline", ar.currentline); break; case 'u': settabsi(L, "nups", ar.nups); break; case 'n': settabss(L, "name", ar.name); settabss(L, "namewhat", ar.namewhat); break; case 'f': lua_pushliteral(L, "func"); lua_pushvalue(L, -3); lua_rawset(L, -3); break; } } return 1; /* return table */ } static int getlocal (lua_State *L) { lua_Debug ar; const char *name; if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */ return luaL_argerror(L, 1, "level out of range"); name = lua_getlocal(L, &ar, luaL_check_int(L, 2)); if (name) { lua_pushstring(L, name); lua_pushvalue(L, -2); return 2; } else { lua_pushnil(L); return 1; } } static int setlocal (lua_State *L) { lua_Debug ar; if (!lua_getstack(L, luaL_check_int(L, 1), &ar)) /* level out of range? */ return luaL_argerror(L, 1, "level out of range"); luaL_check_any(L, 3); lua_pushstring(L, lua_setlocal(L, &ar, luaL_check_int(L, 2))); return 1; } static const char KEY_HOOK = 'h'; static void hookf (lua_State *L, lua_Debug *ar) { static const char *const hooknames[] = {"call", "return", "line", "count"}; lua_pushlightuserdata(L, (void *)&KEY_HOOK); lua_rawget(L, LUA_REGISTRYINDEX); if (lua_isfunction(L, -1)) { lua_pushstring(L, hooknames[(int)ar->event]); if (ar->currentline >= 0) lua_pushnumber(L, ar->currentline); else lua_pushnil(L); lua_assert(lua_getinfo(L, "lS", ar)); lua_call(L, 2, 0); } else lua_pop(L, 1); /* pop result from gettable */ } static unsigned long makemask (const char *smask, int count) { unsigned long mask = 0; if (strchr(smask, 'c')) mask |= LUA_MASKCALL; if (strchr(smask, 'r')) mask |= LUA_MASKRET; if (strchr(smask, 'l')) mask |= LUA_MASKLINE; return mask | LUA_MASKCOUNT(count); } static char *unmakemask (unsigned long mask, char *smask) { int i = 0; if (mask & LUA_MASKCALL) smask[i++] = 'c'; if (mask & LUA_MASKRET) smask[i++] = 'r'; if (mask & LUA_MASKLINE) smask[i++] = 'l'; smask[i] = '\0'; return smask; } static int sethook (lua_State *L) { if (lua_isnoneornil(L, 1)) { lua_settop(L, 1); lua_sethook(L, NULL, 0); /* turn off hooks */ } else { const char *smask = luaL_check_string(L, 2); lua_Number count = luaL_opt_number(L, 3, 0); luaL_check_type(L, 1, LUA_TFUNCTION); luaL_arg_check(L, count <= LUA_MAXCOUNT, 2, "count too large (>= 2^24)"); lua_sethook(L, hookf, makemask(smask, count)); } lua_pushlightuserdata(L, (void *)&KEY_HOOK); lua_pushvalue(L, 1); lua_rawset(L, LUA_REGISTRYINDEX); /* set new hook */ return 0; } static int gethook (lua_State *L) { char buff[5]; unsigned long mask = lua_gethookmask(L); lua_pushlightuserdata(L, (void *)&KEY_HOOK); lua_rawget(L, LUA_REGISTRYINDEX); /* get hook */ lua_pushstring(L, unmakemask(mask, buff)); lua_pushnumber(L, lua_getmaskcount(mask)); return 3; } static int debug (lua_State *L) { for (;;) { char buffer[250]; fputs("lua_debug> ", stderr); if (fgets(buffer, sizeof(buffer), stdin) == 0 || strcmp(buffer, "cont\n") == 0) return 0; lua_dostring(L, buffer); lua_settop(L, 0); /* remove eventual returns */ } } #define LEVELS1 12 /* size of the first part of the stack */ #define LEVELS2 10 /* size of the second part of the stack */ static int errorfb (lua_State *L) { int level = 1; /* skip level 0 (it's this function) */ int firstpart = 1; /* still before eventual `...' */ lua_Debug ar; if (lua_gettop(L) == 0) lua_pushliteral(L, ""); else if (!lua_isstring(L, 1)) return 1; /* no string message */ lua_pushliteral(L, "stack traceback:\n"); while (lua_getstack(L, level++, &ar)) { if (level > LEVELS1 && firstpart) { /* no more than `LEVELS2' more levels? */ if (!lua_getstack(L, level+LEVELS2, &ar)) level--; /* keep going */ else { lua_pushliteral(L, "\t...\n"); /* too many levels */ while (lua_getstack(L, level+LEVELS2, &ar)) /* find last levels */ level++; } firstpart = 0; continue; } lua_pushliteral(L, "\t"); lua_getinfo(L, "Snl", &ar); lua_pushfstring(L, "%s:", ar.short_src); if (ar.currentline > 0) lua_pushfstring(L, "%d:", ar.currentline); switch (*ar.namewhat) { case 'g': /* global */ case 'l': /* local */ case 'f': /* field */ case 'm': /* method */ lua_pushfstring(L, " in function `%s'", ar.name); break; default: { if (*ar.what == 'm') /* main? */ lua_pushfstring(L, " in main chunk"); else if (*ar.what == 'C') /* C function? */ lua_pushfstring(L, "%s", ar.short_src); else lua_pushfstring(L, " in function <%s:%d>", ar.short_src, ar.linedefined); } } lua_pushliteral(L, "\n"); lua_concat(L, lua_gettop(L)); } lua_concat(L, lua_gettop(L)); return 1; } static const luaL_reg dblib[] = { {"getlocal", getlocal}, {"getinfo", getinfo}, {"gethook", gethook}, {"sethook", sethook}, {"setlocal", setlocal}, {"debug", debug}, {"traceback", errorfb}, {NULL, NULL} }; LUALIB_API int lua_dblibopen (lua_State *L) { luaL_opennamedlib(L, LUA_DBLIBNAME, dblib, 0); lua_pushliteral(L, "_TRACEBACK"); lua_pushcfunction(L, errorfb); lua_settable(L, LUA_GLOBALSINDEX); return 0; }