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