/* ** $Id: ldblib.c,v 1.132.1.2 2015/02/19 17:16:55 roberto Exp $ ** Interface from Lua to its debug API ** See Copyright Notice in lua.h */ #include #include #include #define ldblib_c #define LUA_LIB #include "lua.h" #include "lauxlib.h" #include "lualib.h" #define HOOKKEY "_HKEY" static void checkstack (lua_State *L, lua_State *L1, int n) { if (L != L1 && !lua_checkstack(L1, n)) luaL_error(L, "stack overflow"); } static int db_getregistry (lua_State *L) { lua_pushvalue(L, LUA_REGISTRYINDEX); return 1; } static int db_getmetatable (lua_State *L) { luaL_checkany(L, 1); if (!lua_getmetatable(L, 1)) { lua_pushnil(L); /* no metatable */ } return 1; } static int db_setmetatable (lua_State *L) { int t = lua_type(L, 2); luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table expected"); lua_settop(L, 2); lua_setmetatable(L, 1); return 1; /* return 1st argument */ } static int db_getuservalue (lua_State *L) { if (lua_type(L, 1) != LUA_TUSERDATA) lua_pushnil(L); else lua_getuservalue(L, 1); return 1; } static int db_setuservalue (lua_State *L) { if (lua_type(L, 1) == LUA_TLIGHTUSERDATA) luaL_argerror(L, 1, "full userdata expected, got light userdata"); luaL_checktype(L, 1, LUA_TUSERDATA); if (!lua_isnoneornil(L, 2)) luaL_checktype(L, 2, LUA_TTABLE); lua_settop(L, 2); lua_setuservalue(L, 1); return 1; } static void settabss (lua_State *L, const char *i, const char *v) { lua_pushstring(L, v); lua_setfield(L, -2, i); } static void settabsi (lua_State *L, const char *i, int v) { lua_pushinteger(L, v); lua_setfield(L, -2, i); } static void settabsb (lua_State *L, const char *i, int v) { lua_pushboolean(L, v); lua_setfield(L, -2, i); } static lua_State *getthread (lua_State *L, int *arg) { if (lua_isthread(L, 1)) { *arg = 1; return lua_tothread(L, 1); } else { *arg = 0; return L; } } static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) { if (L == L1) { lua_pushvalue(L, -2); lua_remove(L, -3); } else lua_xmove(L1, L, 1); lua_setfield(L, -2, fname); } static int db_getinfo (lua_State *L) { lua_Debug ar; int arg; lua_State *L1 = getthread(L, &arg); const char *options = luaL_optstring(L, arg+2, "flnStu"); checkstack(L, L1, 3); if (lua_isnumber(L, arg+1)) { if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) { lua_pushnil(L); /* level out of range */ return 1; } } else if (lua_isfunction(L, arg+1)) { lua_pushfstring(L, ">%s", options); options = lua_tostring(L, -1); lua_pushvalue(L, arg+1); lua_xmove(L, L1, 1); } else return luaL_argerror(L, arg+1, "function or level expected"); if (!lua_getinfo(L1, options, &ar)) return luaL_argerror(L, arg+2, "invalid option"); lua_createtable(L, 0, 2); if (strchr(options, 'S')) { settabss(L, "source", ar.source); settabss(L, "short_src", ar.short_src); settabsi(L, "linedefined", ar.linedefined); settabsi(L, "lastlinedefined", ar.lastlinedefined); settabss(L, "what", ar.what); } if (strchr(options, 'l')) settabsi(L, "currentline", ar.currentline); if (strchr(options, 'u')) { settabsi(L, "nups", ar.nups); settabsi(L, "nparams", ar.nparams); settabsb(L, "isvararg", ar.isvararg); } if (strchr(options, 'n')) { settabss(L, "name", ar.name); settabss(L, "namewhat", ar.namewhat); } if (strchr(options, 't')) settabsb(L, "istailcall", ar.istailcall); if (strchr(options, 'L')) treatstackoption(L, L1, "activelines"); if (strchr(options, 'f')) treatstackoption(L, L1, "func"); return 1; /* return table */ } static int db_getlocal (lua_State *L) { int arg; lua_State *L1 = getthread(L, &arg); lua_Debug ar; const char *name; int nvar = luaL_checkint(L, arg+2); /* local-variable index */ if (lua_isfunction(L, arg + 1)) { /* function argument? */ lua_pushvalue(L, arg + 1); /* push function */ lua_pushstring(L, lua_getlocal(L, NULL, nvar)); /* push local name */ return 1; } else { /* stack-level argument */ if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ return luaL_argerror(L, arg+1, "level out of range"); checkstack(L, L1, 1); name = lua_getlocal(L1, &ar, nvar); if (name) { lua_xmove(L1, L, 1); /* push local value */ lua_pushstring(L, name); /* push name */ lua_pushvalue(L, -2); /* re-order */ return 2; } else { lua_pushnil(L); /* no name (nor value) */ return 1; } } } static int db_setlocal (lua_State *L) { int arg; lua_State *L1 = getthread(L, &arg); lua_Debug ar; if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */ return luaL_argerror(L, arg+1, "level out of range"); luaL_checkany(L, arg+3); lua_settop(L, arg+3); checkstack(L, L1, 1); lua_xmove(L, L1, 1); lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2))); return 1; } static int auxupvalue (lua_State *L, int get) { const char *name; int n = luaL_checkint(L, 2); luaL_checktype(L, 1, LUA_TFUNCTION); name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n); if (name == NULL) return 0; lua_pushstring(L, name); lua_insert(L, -(get+1)); return get + 1; } static int db_getupvalue (lua_State *L) { return auxupvalue(L, 1); } static int db_setupvalue (lua_State *L) { luaL_checkany(L, 3); return auxupvalue(L, 0); } static int checkupval (lua_State *L, int argf, int argnup) { lua_Debug ar; int nup = luaL_checkint(L, argnup); luaL_checktype(L, argf, LUA_TFUNCTION); lua_pushvalue(L, argf); lua_getinfo(L, ">u", &ar); luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index"); return nup; } static int db_upvalueid (lua_State *L) { int n = checkupval(L, 1, 2); lua_pushlightuserdata(L, lua_upvalueid(L, 1, n)); return 1; } static int db_upvaluejoin (lua_State *L) { int n1 = checkupval(L, 1, 2); int n2 = checkupval(L, 3, 4); luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected"); luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected"); lua_upvaluejoin(L, 1, n1, 3, n2); return 0; } #define gethooktable(L) luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY) static void hookf (lua_State *L, lua_Debug *ar) { static const char *const hooknames[] = {"call", "return", "line", "count", "tail call"}; gethooktable(L); lua_pushthread(L); lua_rawget(L, -2); if (lua_isfunction(L, -1)) { lua_pushstring(L, hooknames[(int)ar->event]); if (ar->currentline >= 0) lua_pushinteger(L, ar->currentline); else lua_pushnil(L); lua_assert(lua_getinfo(L, "lS", ar)); lua_call(L, 2, 0); } } static int makemask (const char *smask, int count) { int mask = 0; if (strchr(smask, 'c')) mask |= LUA_MASKCALL; if (strchr(smask, 'r')) mask |= LUA_MASKRET; if (strchr(smask, 'l')) mask |= LUA_MASKLINE; if (count > 0) mask |= LUA_MASKCOUNT; return mask; } static char *unmakemask (int 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 db_sethook (lua_State *L) { int arg, mask, count; lua_Hook func; lua_State *L1 = getthread(L, &arg); if (lua_isnoneornil(L, arg+1)) { lua_settop(L, arg+1); func = NULL; mask = 0; count = 0; /* turn off hooks */ } else { const char *smask = luaL_checkstring(L, arg+2); luaL_checktype(L, arg+1, LUA_TFUNCTION); count = luaL_optint(L, arg+3, 0); func = hookf; mask = makemask(smask, count); } if (gethooktable(L) == 0) { /* creating hook table? */ lua_pushstring(L, "k"); lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */ lua_pushvalue(L, -1); lua_setmetatable(L, -2); /* setmetatable(hooktable) = hooktable */ } checkstack(L, L1, 1); lua_pushthread(L1); lua_xmove(L1, L, 1); lua_pushvalue(L, arg+1); lua_rawset(L, -3); /* set new hook */ lua_sethook(L1, func, mask, count); /* set hooks */ return 0; } static int db_gethook (lua_State *L) { int arg; lua_State *L1 = getthread(L, &arg); char buff[5]; int mask = lua_gethookmask(L1); lua_Hook hook = lua_gethook(L1); if (hook != NULL && hook != hookf) /* external hook? */ lua_pushliteral(L, "external hook"); else { gethooktable(L); checkstack(L, L1, 1); lua_pushthread(L1); lua_xmove(L1, L, 1); lua_rawget(L, -2); /* get hook */ lua_remove(L, -2); /* remove hook table */ } lua_pushstring(L, unmakemask(mask, buff)); lua_pushinteger(L, lua_gethookcount(L1)); return 3; } static int db_debug (lua_State *L) { for (;;) { char buffer[250]; luai_writestringerror("%s", "lua_debug> "); if (fgets(buffer, sizeof(buffer), stdin) == 0 || strcmp(buffer, "cont\n") == 0) return 0; if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") || lua_pcall(L, 0, 0, 0)) luai_writestringerror("%s\n", lua_tostring(L, -1)); lua_settop(L, 0); /* remove eventual returns */ } } static int db_traceback (lua_State *L) { int arg; lua_State *L1 = getthread(L, &arg); const char *msg = lua_tostring(L, arg + 1); if (msg == NULL && !lua_isnoneornil(L, arg + 1)) /* non-string 'msg'? */ lua_pushvalue(L, arg + 1); /* return it untouched */ else { int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0); luaL_traceback(L, L1, msg, level); } return 1; } static const luaL_Reg dblib[] = { {"debug", db_debug}, {"getuservalue", db_getuservalue}, {"gethook", db_gethook}, {"getinfo", db_getinfo}, {"getlocal", db_getlocal}, {"getregistry", db_getregistry}, {"getmetatable", db_getmetatable}, {"getupvalue", db_getupvalue}, {"upvaluejoin", db_upvaluejoin}, {"upvalueid", db_upvalueid}, {"setuservalue", db_setuservalue}, {"sethook", db_sethook}, {"setlocal", db_setlocal}, {"setmetatable", db_setmetatable}, {"setupvalue", db_setupvalue}, {"traceback", db_traceback}, {NULL, NULL} }; LUAMOD_API int luaopen_debug (lua_State *L) { luaL_newlib(L, dblib); return 1; }