Lua 4.04.0

1 files changed, 94 insertions, 59 deletions

diff --git a/src/lstate.c b/src/lstate.c
index 3b98d729..586c1085 100644
--- a/src/lstate.c
+++ b/src/lstate.c
@@ -1,13 +1,15 @@
 /*
-** $Id: lstate.c,v 1.12 1999/05/11 20:08:20 roberto Exp $
+** $Id: lstate.c,v 1.48 2000/10/30 16:29:59 roberto Exp $
 ** Global State
 ** See Copyright Notice in lua.h
 */
 
 
-#include "lbuiltin.h"
+#include <stdio.h>
+
+#include "lua.h"
+
 #include "ldo.h"
-#include "lfunc.h"
 #include "lgc.h"
 #include "llex.h"
 #include "lmem.h"
@@ -17,70 +19,103 @@
 #include "ltm.h"
 
 
-lua_State *lua_state = NULL;
+#ifdef LUA_DEBUG
+static lua_State *lua_state = NULL;
+void luaB_opentests (lua_State *L);
+#endif
 
 
-void lua_open (void)
-{
-  if (lua_state) return;
-  lua_state = luaM_new(lua_State);
-  L->Cstack.base = 0;
-  L->Cstack.lua2C = 0;
-  L->Cstack.num = 0;
-  L->errorJmp = NULL;
+/*
+** 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->Mbuffbase = 0;
   L->Mbuffsize = 0;
-  L->Mbuffnext = 0;
-  L->Cblocks = NULL;
-  L->numCblocks = 0;
-  L->debug = 0;
-  L->callhook = NULL;
-  L->linehook = NULL;
-  L->rootproto.next = NULL;
-  L->rootproto.marked = 0;
-  L->rootcl.next = NULL;
-  L->rootcl.marked = 0;
-  L->rootglobal.next = NULL;
-  L->rootglobal.marked = 0;
-  L->roottable.next = NULL;
-  L->roottable.marked = 0;
-  L->IMtable = NULL;
+  L->rootproto = NULL;
+  L->rootcl = NULL;
+  L->roottable = NULL;
+  L->TMtable = NULL;
+  L->last_tag = -1;
   L->refArray = NULL;
   L->refSize = 0;
-  L->GCthreshold = GARBAGE_BLOCK;
-  L->nblocks = 0;
-  luaD_init();
-  luaS_init();
-  luaX_init();
-  luaT_init();
-  luaB_predefine();
+  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;
 }
 
 
-void lua_close (void)
-{
-  TaggedString *alludata = luaS_collectudata();
-  L->GCthreshold = MAX_INT;  /* to avoid GC during GC */
-  luaC_hashcallIM((Hash *)L->roottable.next);  /* GC t.methods for tables */
-  luaC_strcallIM(alludata);  /* GC tag methods for userdata */
-  luaD_gcIM(&luaO_nilobject);  /* GC tag method for nil (signal end of GC) */
-  luaH_free((Hash *)L->roottable.next);
-  luaF_freeproto((TProtoFunc *)L->rootproto.next);
-  luaF_freeclosure((Closure *)L->rootcl.next);
-  luaS_free(alludata);
-  luaS_freeall();
-  luaM_free(L->stack.stack);
-  luaM_free(L->IMtable);
-  luaM_free(L->refArray);
-  luaM_free(L->Mbuffer);
-  luaM_free(L->Cblocks);
-  luaM_free(L);
-  L = NULL;
-#ifdef DEBUG
-  printf("total de blocos: %ld\n", numblocks);
-  printf("total de memoria: %ld\n", totalmem);
-#endif
+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!");
 }
 
-