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/*
** $Id: $
** Lua Funcion auxiliar
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include "lfunc.h"
#include "lmem.h"
TProtoFunc *luaF_root = NULL;
Closure *luaF_rootcl = NULL;
static void luaI_insertfunction (TProtoFunc *f)
{
++luaO_nentities;
f->head.next = (GCnode *)luaF_root;
luaF_root = f;
f->head.marked = 0;
}
Closure *luaF_newclosure (int nelems)
{
Closure *c = (Closure *)luaM_malloc(sizeof(Closure)+nelems*sizeof(TObject));
++luaO_nentities;
c->head.next = (GCnode *)luaF_rootcl;
luaF_rootcl = c;
c->head.marked = 0;
return c;
}
TProtoFunc *luaF_newproto (void)
{
TProtoFunc *f = luaM_new(TProtoFunc);
f->code = NULL;
f->lineDefined = 0;
f->fileName = NULL;
f->consts = NULL;
f->nconsts = 0;
f->nupvalues = 0;
f->locvars = NULL;
luaI_insertfunction(f);
return f;
}
static void freefunc (TProtoFunc *f)
{
luaM_free(f->code);
luaM_free(f->locvars);
luaM_free(f->consts);
luaM_free(f);
}
void luaF_freeproto (TProtoFunc *l)
{
while (l) {
TProtoFunc *next = (TProtoFunc *)l->head.next;
freefunc(l);
l = next;
}
}
void luaF_freeclosure (Closure *l)
{
while (l) {
Closure *next = (Closure *)l->head.next;
luaM_free(l);
l = next;
}
}
/*
** Look for n-esim local variable at line "line" in function "func".
** Returns NULL if not found.
*/
char *luaF_getlocalname (TProtoFunc *func, int local_number, int line)
{
int count = 0;
char *varname = NULL;
LocVar *lv = func->locvars;
if (lv == NULL)
return NULL;
for (; lv->line != -1 && lv->line < line; lv++) {
if (lv->varname) { /* register */
if (++count == local_number)
varname = lv->varname->str;
}
else /* unregister */
if (--count < local_number)
varname = NULL;
}
return varname;
}
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