lstate.c
上传用户:dzyhzl
上传日期:2019-04-29
资源大小:56270k
文件大小:3k
- /*
- ** $Id: lstate.c,v 1.48 2000/10/30 16:29:59 roberto Exp $
- ** 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: %sn", 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!");
- }