mirror of https://github.com/lua/lua
99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/*
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** $Id: lfunc.c,v 1.7 1997/12/09 13:35:19 roberto Exp roberto $
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** Auxiliar functions to manipulate prototypes and closures
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include "lfunc.h"
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#include "lmem.h"
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#include "lstate.h"
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#define gcsizeproto(p) 5 /* approximate "weight" for a prototype */
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#define gcsizeclosure(c) 1 /* approximate "weight" for a closure */
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Closure *luaF_newclosure (int nelems)
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{
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Closure *c = (Closure *)luaM_malloc(sizeof(Closure)+nelems*sizeof(TObject));
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luaO_insertlist(&(L->rootcl), (GCnode *)c);
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L->nblocks += gcsizeclosure(c);
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c->nelems = nelems;
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return c;
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}
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TProtoFunc *luaF_newproto (void)
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{
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TProtoFunc *f = luaM_new(TProtoFunc);
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f->code = NULL;
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f->lineDefined = 0;
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f->fileName = NULL;
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f->consts = NULL;
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f->nconsts = 0;
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f->locvars = NULL;
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luaO_insertlist(&(L->rootproto), (GCnode *)f);
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L->nblocks += gcsizeproto(f);
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return f;
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}
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static void freefunc (TProtoFunc *f)
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{
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luaM_free(f->code);
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luaM_free(f->locvars);
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luaM_free(f->consts);
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luaM_free(f);
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}
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void luaF_freeproto (TProtoFunc *l)
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{
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while (l) {
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TProtoFunc *next = (TProtoFunc *)l->head.next;
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L->nblocks -= gcsizeproto(l);
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freefunc(l);
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l = next;
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}
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}
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void luaF_freeclosure (Closure *l)
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{
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while (l) {
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Closure *next = (Closure *)l->head.next;
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L->nblocks -= gcsizeclosure(l);
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luaM_free(l);
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l = next;
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}
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}
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/*
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** Look for n-th local variable at line "line" in function "func".
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** Returns NULL if not found.
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*/
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char *luaF_getlocalname (TProtoFunc *func, int local_number, int line)
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{
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int count = 0;
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char *varname = NULL;
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LocVar *lv = func->locvars;
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if (lv == NULL)
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return NULL;
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for (; lv->line != -1 && lv->line < line; lv++) {
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if (lv->varname) { /* register */
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if (++count == local_number)
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varname = lv->varname->str;
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}
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else /* unregister */
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if (--count < local_number)
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varname = NULL;
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}
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return varname;
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}
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