| /* |
| ** $Id: lstate.c,v 1.47 2000/10/26 12:47:05 roberto Exp roberto $ |
| ** Global State |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdio.h> |
| |
| #include "lua.h" |
| |
| #include "ldo.h" |
| #include "lgc.h" |
| #include "llex.h" |
| #include "lmem.h" |
| #include "lstate.h" |
| #include "lstring.h" |
| #include "ltable.h" |
| #include "ltm.h" |
| |
| |
| #ifdef LUA_DEBUG |
| static lua_State *lua_state = NULL; |
| void luaB_opentests (lua_State *L); |
| #endif |
| |
| |
| /* |
| ** built-in implementation for ERRORMESSAGE. In a "correct" environment |
| ** ERRORMESSAGE should have an external definition, and so this function |
| ** would not be used. |
| */ |
| static int errormessage (lua_State *L) { |
| const char *s = lua_tostring(L, 1); |
| if (s == NULL) s = "(no message)"; |
| fprintf(stderr, "error: %s\n", s); |
| return 0; |
| } |
| |
| |
| /* |
| ** open parts that may cause memory-allocation errors |
| */ |
| static void f_luaopen (lua_State *L, void *ud) { |
| int stacksize = *(int *)ud; |
| if (stacksize == 0) |
| stacksize = DEFAULT_STACK_SIZE; |
| else |
| stacksize += LUA_MINSTACK; |
| L->gt = luaH_new(L, 10); /* table of globals */ |
| luaD_init(L, stacksize); |
| luaS_init(L); |
| luaX_init(L); |
| luaT_init(L); |
| lua_newtable(L); |
| lua_ref(L, 1); /* create registry */ |
| lua_register(L, LUA_ERRORMESSAGE, errormessage); |
| #ifdef LUA_DEBUG |
| luaB_opentests(L); |
| if (lua_state == NULL) lua_state = L; /* keep first state to be opened */ |
| #endif |
| LUA_ASSERT(lua_gettop(L) == 0, "wrong API stack"); |
| } |
| |
| |
| LUA_API lua_State *lua_open (int stacksize) { |
| lua_State *L = luaM_new(NULL, lua_State); |
| if (L == NULL) return NULL; /* memory allocation error */ |
| L->stack = NULL; |
| L->strt.size = L->udt.size = 0; |
| L->strt.nuse = L->udt.nuse = 0; |
| L->strt.hash = NULL; |
| L->udt.hash = NULL; |
| L->Mbuffer = NULL; |
| L->Mbuffsize = 0; |
| L->rootproto = NULL; |
| L->rootcl = NULL; |
| L->roottable = NULL; |
| L->TMtable = NULL; |
| L->last_tag = -1; |
| L->refArray = NULL; |
| L->refSize = 0; |
| L->refFree = NONEXT; |
| L->nblocks = sizeof(lua_State); |
| L->GCthreshold = MAX_INT; /* to avoid GC during pre-definitions */ |
| L->callhook = NULL; |
| L->linehook = NULL; |
| L->allowhooks = 1; |
| L->errorJmp = NULL; |
| if (luaD_runprotected(L, f_luaopen, &stacksize) != 0) { |
| /* memory allocation error: free partial state */ |
| lua_close(L); |
| return NULL; |
| } |
| L->GCthreshold = 2*L->nblocks; |
| return L; |
| } |
| |
| |
| LUA_API void lua_close (lua_State *L) { |
| LUA_ASSERT(L != lua_state || lua_gettop(L) == 0, "garbage in C stack"); |
| luaC_collect(L, 1); /* collect all elements */ |
| LUA_ASSERT(L->rootproto == NULL, "list should be empty"); |
| LUA_ASSERT(L->rootcl == NULL, "list should be empty"); |
| LUA_ASSERT(L->roottable == NULL, "list should be empty"); |
| luaS_freeall(L); |
| if (L->stack) |
| L->nblocks -= (L->stack_last - L->stack + 1)*sizeof(TObject); |
| luaM_free(L, L->stack); |
| L->nblocks -= (L->last_tag+1)*sizeof(struct TM); |
| luaM_free(L, L->TMtable); |
| L->nblocks -= (L->refSize)*sizeof(struct Ref); |
| luaM_free(L, L->refArray); |
| L->nblocks -= (L->Mbuffsize)*sizeof(char); |
| luaM_free(L, L->Mbuffer); |
| LUA_ASSERT(L->nblocks == sizeof(lua_State), "wrong count for nblocks"); |
| luaM_free(L, L); |
| LUA_ASSERT(L != lua_state || memdebug_numblocks == 0, "memory leak!"); |
| LUA_ASSERT(L != lua_state || memdebug_total == 0,"memory leak!"); |
| } |
| |