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/*
** $Id: lfunc.c,v 1.29 2000/08/09 19:16:57 roberto Exp roberto $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include "lua.h"
#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->nupvalues, sizeof(Closure))
Closure *luaF_newclosure (lua_State *L, int nelems) {
Closure *c = (Closure *)luaM_malloc(L, sizeof(Closure) +
(lint32)sizeof(TObject)*(nelems-1));
c->next = L->rootcl;
L->rootcl = c;
c->mark = c;
c->nupvalues = nelems;
L->nblocks += gcsizeclosure(L, c);
return c;
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
f->code = NULL;
f->lineinfo = 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->nlocvars = 0;
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->lineinfo);
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 *f, int local_number, int pc) {
int i;
for (i = 0; i<f->nlocvars && f->locvars[i].startpc <= pc; i++) {
if (pc < f->locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return f->locvars[i].varname->str;
}
}
return NULL; /* not found */
}
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