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authorShadowNinja <shadowninja@minetest.net>2014-09-14 20:58:21 -0400
committerShadowNinja <shadowninja@minetest.net>2014-09-18 21:54:23 -0400
commit8852333eb3042580592ade478e5def20f8ed5d4c (patch)
treef7fcd6614a7e456cbe211410fe43fa417405da6c /games/minimal/mods/legacy/init.lua
parent86a3c8ce566f28112dc032aa48c40e12fde97be2 (diff)
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/*
** $Id: lfunc.c,v 2.12.1.2 2007/12/28 14:58:43 roberto Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/


#include <stddef.h>

#define lfunc_c
#define LUA_CORE

#include "lua.h"

#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"



Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e) {
  Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
  luaC_link(L, obj2gco(c), LUA_TFUNCTION);
  c->c.isC = 1;
  c->c.env = e;
  c->c.nupvalues = cast_byte(nelems);
  return c;
}


Closure *luaF_newLclosure (lua_State *L, int nelems, Table *e) {
  Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
  luaC_link(L, obj2gco(c), LUA_TFUNCTION);
  c->l.isC = 0;
  c->l.env = e;
  c->l.nupvalues = cast_byte(nelems);
  while (nelems--) c->l.upvals[nelems] = NULL;
  return c;
}


UpVal *luaF_newupval (lua_State *L) {
  UpVal *uv = luaM_new(L, UpVal);
  luaC_link(L, obj2gco(uv), LUA_TUPVAL);
  uv->v = &uv->u.value;
  setnilvalue(uv->v);
  return uv;
}


UpVal *luaF_findupval (lua_State *L, StkId level) {
  global_State *g = G(L);
  GCObject **pp = &L->openupval;
  UpVal *p;
  UpVal *uv;
  while (*pp != NULL && (p = ngcotouv(*pp))->v >= level) {
    lua_assert(p->v != &p->u.value);
    if (p->v == level) {  /* found a corresponding upvalue? */
      if (isdead(g, obj2gco(p)))  /* is it dead? */
        changewhite(obj2gco(p));  /* ressurect it */
      return p;
    }
    pp = &p->next;
  }
  uv = luaM_new(L, UpVal);  /* not found: create a new one */
  uv->tt = LUA_TUPVAL;
  uv->marked = luaC_white(g);
  uv->v = level;  /* current value lives in the stack */
  uv->next = *pp;  /* chain it in the proper position */
  *pp = obj2gco(uv);
  uv->u.l.prev = &g->uvhead;  /* double link it in `uvhead' list */
  uv->u.l.next = g->uvhead.u.l.next;
  uv->u.l.next->u.l.prev = uv;
  g->uvhead.u.l.next = uv;