mirror of https://github.com/lua/lua
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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** $Id: lfunc.c,v 1.29 2000/08/09 19:16:57 roberto Exp roberto $
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** Auxiliary 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 "lua.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(L, p) numblocks(L, 0, sizeof(Proto))
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#define gcsizeclosure(L, c) numblocks(L, c->nupvalues, sizeof(Closure))
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Closure *luaF_newclosure (lua_State *L, int nelems) {
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Closure *c = (Closure *)luaM_malloc(L, sizeof(Closure) +
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(lint32)sizeof(TObject)*(nelems-1));
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c->next = L->rootcl;
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L->rootcl = c;
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c->mark = c;
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c->nupvalues = nelems;
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L->nblocks += gcsizeclosure(L, c);
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return c;
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}
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Proto *luaF_newproto (lua_State *L) {
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Proto *f = luaM_new(L, Proto);
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f->code = NULL;
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f->lineinfo = NULL;
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f->lineDefined = 0;
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f->source = NULL;
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f->kstr = NULL;
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f->nkstr = 0;
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f->knum = NULL;
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f->nknum = 0;
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f->kproto = NULL;
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f->nkproto = 0;
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f->locvars = NULL;
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f->nlocvars = 0;
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f->next = L->rootproto;
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L->rootproto = f;
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f->marked = 0;
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L->nblocks += gcsizeproto(L, f);
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return f;
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}
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void luaF_freeproto (lua_State *L, Proto *f) {
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L->nblocks -= gcsizeproto(L, f);
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luaM_free(L, f->code);
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luaM_free(L, f->locvars);
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luaM_free(L, f->kstr);
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luaM_free(L, f->knum);
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luaM_free(L, f->kproto);
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luaM_free(L, f->lineinfo);
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luaM_free(L, f);
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}
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void luaF_freeclosure (lua_State *L, Closure *c) {
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L->nblocks -= gcsizeclosure(L, c);
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luaM_free(L, c);
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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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const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
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int i;
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for (i = 0; i<f->nlocvars && f->locvars[i].startpc <= pc; i++) {
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if (pc < f->locvars[i].endpc) { /* is variable active? */
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local_number--;
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if (local_number == 0)
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return f->locvars[i].varname->str;
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}
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}
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return NULL; /* not found */
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}
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