lfunc.c File Reference

#include <stddef.h>
#include "lua.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"

Go to the source code of this file.

Macros
#define	lfunc_c
#define	LUA_CORE

Functions
Closure *	luaF_newCclosure (lua_State *L, int n)
Closure *	luaF_newLclosure (lua_State *L, int n)
UpVal *	luaF_newupval (lua_State *L)
UpVal *	luaF_findupval (lua_State *L, StkId level)
static void	unlinkupval (UpVal *uv)
void	luaF_freeupval (lua_State *L, UpVal *uv)
void	luaF_close (lua_State *L, StkId level)
Proto *	luaF_newproto (lua_State *L)
void	luaF_freeproto (lua_State *L, Proto *f)
const char *	luaF_getlocalname (const Proto *f, int local_number, int pc)

Macro Definition Documentation

lfunc_c

#define lfunc_c

Definition at line 10 of file lua-5.2.4/src/lfunc.c.

LUA_CORE

#define LUA_CORE

Definition at line 11 of file lua-5.2.4/src/lfunc.c.

Function Documentation

luaF_close()

void luaF_close	(	lua_State *	L,
		StkId	level )

Definition at line 89 of file lua-5.2.4/src/lfunc.c.

                                            {
  UpVal *uv;
  global_State *g = G(L);
  while (L->openupval != NULL && (uv = gco2uv(L->openupval))->v >= level) {
    GCObject *o = obj2gco(uv);
    lua_assert(!isblack(o) && uv->v != &uv->u.value);
    L->openupval = uv->next;  /* remove from `open' list */
    if (isdead(g, o))
      luaF_freeupval(L, uv);  /* free upvalue */
    else {
      unlinkupval(uv);  /* remove upvalue from 'uvhead' list */
      setobj(L, &uv->u.value, uv->v);  /* move value to upvalue slot */
      uv->v = &uv->u.value;  /* now current value lives here */
      gch(o)->next = g->allgc;  /* link upvalue into 'allgc' list */
      g->allgc = o;
      luaC_checkupvalcolor(g, uv);
    }
  }
}

References global_State::allgc, G, gch, gco2uv, isblack, isdead, lua_assert, luaC_checkupvalcolor(), luaF_freeupval(), UpVal::next, NULL, obj2gco, lua_State::openupval, setobj, UpVal::u, unlinkupval(), UpVal::v, and UpVal::value.

luaF_findupval()

UpVal * luaF_findupval	(	lua_State *	L,
		StkId	level )

Definition at line 47 of file lua-5.2.4/src/lfunc.c.

                                                  {
  global_State *g = G(L);
  GCObject **pp = &L->openupval;
  UpVal *p;
  UpVal *uv;
  while (*pp != NULL && (p = gco2uv(*pp))->v >= level) {
    GCObject *o = obj2gco(p);
    lua_assert(p->v != &p->u.value);
    lua_assert(!isold(o) || isold(obj2gco(L)));
    if (p->v == level) {  /* found a corresponding upvalue? */
      if (isdead(g, o))  /* is it dead? */
        changewhite(o);  /* resurrect it */
      return p;
    }
    pp = &p->next;
  }
  /* not found: create a new one */
  uv = &luaC_newobj(L, LUA_TUPVAL, sizeof(UpVal), pp, 0)->uv;
  uv->v = level;  /* current value lives in the stack */
  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;
  lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
  return uv;
}

References changewhite, G, gco2uv, isdead, isold, UpVal::l, lua_assert, LUA_TUPVAL, luaC_newobj(), UpVal::next, NULL, obj2gco, lua_State::openupval, UpVal::prev, UpVal::u, GCObject::uv, global_State::uvhead, UpVal::v, and UpVal::value.

luaF_freeproto()

void luaF_freeproto	(	lua_State *	L,
		Proto *	f )

Definition at line 135 of file lua-5.2.4/src/lfunc.c.

                                             {
  luaM_freearray(L, f->code, f->sizecode);
  luaM_freearray(L, f->p, f->sizep);
  luaM_freearray(L, f->k, f->sizek);
  luaM_freearray(L, f->lineinfo, f->sizelineinfo);
  luaM_freearray(L, f->locvars, f->sizelocvars);
  luaM_freearray(L, f->upvalues, f->sizeupvalues);
  luaM_free(L, f);
}

References Proto::code, Proto::k, Proto::lineinfo, Proto::locvars, luaM_free, luaM_freearray, Proto::p, Proto::sizecode, Proto::sizek, Proto::sizelineinfo, Proto::sizelocvars, Proto::sizep, Proto::sizeupvalues, and Proto::upvalues.

luaF_freeupval()

void luaF_freeupval	(	lua_State *	L,
		UpVal *	uv )

Definition at line 82 of file lua-5.2.4/src/lfunc.c.

                                              {
  if (uv->v != &uv->u.value)  /* is it open? */
    unlinkupval(uv);  /* remove from open list */
  luaM_free(L, uv);  /* free upvalue */
}

References luaM_free, UpVal::u, unlinkupval(), UpVal::v, and UpVal::value.

Referenced by luaF_close().

luaF_getlocalname()

const char * luaF_getlocalname	(	const Proto *	f,
		int	local_number,
		int	pc )

Definition at line 150 of file lua-5.2.4/src/lfunc.c.

                                                                         {
  int i;
  for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
    if (pc < f->locvars[i].endpc) {  /* is variable active? */
      local_number--;
      if (local_number == 0)
        return getstr(f->locvars[i].varname);
    }
  }
  return NULL;  /* not found */
}

References getstr, Proto::locvars, NULL, Proto::sizelocvars, LocVar::startpc, and LocVar::varname.

luaF_newCclosure()

Closure * luaF_newCclosure	(	lua_State *	L,
		int	n )

Definition at line 23 of file lua-5.2.4/src/lfunc.c.

                                                {
  Closure *c = &luaC_newobj(L, LUA_TCCL, sizeCclosure(n), NULL, 0)->cl;
  c->c.nupvalues = cast_byte(n);
  return c;
}

References Closure::c, cast_byte, GCObject::cl, LUA_TCCL, luaC_newobj(), NULL, and sizeCclosure.

luaF_newLclosure()

Closure * luaF_newLclosure	(	lua_State *	L,
		int	n )

Definition at line 30 of file lua-5.2.4/src/lfunc.c.

                                                {
  Closure *c = &luaC_newobj(L, LUA_TLCL, sizeLclosure(n), NULL, 0)->cl;
  c->l.p = NULL;
  c->l.nupvalues = cast_byte(n);
  while (n--) c->l.upvals[n] = NULL;
  return c;
}

References cast_byte, GCObject::cl, Closure::l, LUA_TLCL, luaC_newobj(), NULL, LClosure::p, sizeLclosure, and LClosure::upvals.

luaF_newproto()

Proto * luaF_newproto

(

lua_State *

L

)

Definition at line 110 of file lua-5.2.4/src/lfunc.c.

                                    {
  Proto *f = &luaC_newobj(L, LUA_TPROTO, sizeof(Proto), NULL, 0)->p;
  f->k = NULL;
  f->sizek = 0;
  f->p = NULL;
  f->sizep = 0;
  f->code = NULL;
  f->cache = NULL;
  f->sizecode = 0;
  f->lineinfo = NULL;
  f->sizelineinfo = 0;
  f->upvalues = NULL;
  f->sizeupvalues = 0;
  f->numparams = 0;
  f->is_vararg = 0;
  f->maxstacksize = 0;
  f->locvars = NULL;
  f->sizelocvars = 0;
  f->linedefined = 0;
  f->lastlinedefined = 0;
  f->source = NULL;
  return f;
}

References Proto::cache, Proto::code, Proto::is_vararg, Proto::k, Proto::lastlinedefined, Proto::linedefined, Proto::lineinfo, Proto::locvars, LUA_TPROTO, luaC_newobj(), Proto::maxstacksize, NULL, Proto::numparams, Proto::p, GCObject::p, Proto::sizecode, Proto::sizek, Proto::sizelineinfo, Proto::sizelocvars, Proto::sizep, Proto::sizeupvalues, Proto::source, and Proto::upvalues.

luaF_newupval()

UpVal * luaF_newupval

(

lua_State *

L

)

Definition at line 39 of file lua-5.2.4/src/lfunc.c.

                                    {
  UpVal *uv = &luaC_newobj(L, LUA_TUPVAL, sizeof(UpVal), NULL, 0)->uv;
  uv->v = &uv->u.value;
  setnilvalue(uv->v);
  return uv;
}

References LUA_TUPVAL, luaC_newobj(), NULL, setnilvalue, UpVal::u, GCObject::uv, UpVal::v, and UpVal::value.

unlinkupval()

static void unlinkupval ( UpVal * uv )

static

Definition at line 75 of file lua-5.2.4/src/lfunc.c.

                                    {
  lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
  uv->u.l.next->u.l.prev = uv->u.l.prev;  /* remove from `uvhead' list */
  uv->u.l.prev->u.l.next = uv->u.l.next;
}

References UpVal::l, lua_assert, UpVal::next, UpVal::prev, and UpVal::u.

Referenced by luaF_close(), and luaF_freeupval().