diff options
Diffstat (limited to 'src/lua/lstate.c')
-rw-r--r-- | src/lua/lstate.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/lua/lstate.c b/src/lua/lstate.c new file mode 100644 index 00000000..6310cb7e --- /dev/null +++ b/src/lua/lstate.c @@ -0,0 +1,121 @@ +/* +** $Id: lstate.c,v 1.3 2001/11/26 23:00:26 darkgod 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: %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!"); +} + |