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/*
** $Id: lfunc.c,v 1.19 2000/03/03 14:58:26 roberto Exp roberto $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#define LUA_REENTRANT
#include "lfunc.h"
#include "lmem.h"
#include "lstate.h"
#define gcsizeproto(L, p) numblocks(L, 0, sizeof(Proto))
#define gcsizeclosure(L, c) numblocks(L, c->nelems, sizeof(Closure))
Closure *luaF_newclosure (lua_State *L, int nelems) {
Closure *c = (Closure *)luaM_malloc(L, sizeof(Closure)+nelems*sizeof(TObject));
c->next = L->rootcl;
L->rootcl = c;
c->marked = 0;
c->nelems = nelems;
L->nblocks += gcsizeclosure(L, c);
return c;
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
f->code = NULL;
f->lineDefined = 0;
f->source = NULL;
f->kstr = NULL;
f->nkstr = 0;
f->knum = NULL;
f->nknum = 0;
f->kproto = NULL;
f->nkproto = 0;
f->locvars = NULL;
f->next = L->rootproto;
L->rootproto = f;
f->marked = 0;
L->nblocks += gcsizeproto(L, f);
return f;
}
void luaF_freeproto (lua_State *L, Proto *f) {
L->nblocks -= gcsizeproto(L, f);
luaM_free(L, f->code);
luaM_free(L, f->locvars);
luaM_free(L, f->kstr);
luaM_free(L, f->knum);
luaM_free(L, f->kproto);
luaM_free(L, f);
}
void luaF_freeclosure (lua_State *L, Closure *c) {
L->nblocks -= gcsizeclosure(L, c);
luaM_free(L, c);
}
/*
** Look for n-th local variable at line `line' in function `func'.
** Returns NULL if not found.
*/
const char *luaF_getlocalname (const Proto *func,
int local_number, int line) {
int count = 0;
const 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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