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/*
** $Id: lfunc.c,v 1.37 2001/01/19 13:20:30 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 sizeclosure(n) ((int)sizeof(Closure) + (int)sizeof(TObject)*((n)-1))
Closure *luaF_newclosure (lua_State *L, int nelems) {
Closure *c = (Closure *)luaM_malloc(L, sizeclosure(nelems));
c->v.ttype = LUA_TFUNCTION;
c->next = G(L)->rootcl;
G(L)->rootcl = c;
c->mark = c;
c->nupvalues = nelems;
return c;
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
f->knum = NULL;
f->sizeknum = 0;
f->kstr = NULL;
f->sizekstr = 0;
f->kproto = NULL;
f->sizekproto = 0;
f->code = NULL;
f->sizecode = 0;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->marked = 0;
f->lineinfo = NULL;
f->sizelocvars = 0;
f->sizelineinfo = 0;
f->locvars = NULL;
f->lineDefined = 0;
f->source = NULL;
f->next = G(L)->rootproto; /* chain in list of protos */
G(L)->rootproto = f;
return f;
}
void luaF_freeproto (lua_State *L, Proto *f) {
luaM_freearray(L, f->code, f->sizecode, Instruction);
luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
luaM_freearray(L, f->kstr, f->sizekstr, TString *);
luaM_freearray(L, f->knum, f->sizeknum, lua_Number);
luaM_freearray(L, f->kproto, f->sizekproto, Proto *);
luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
luaM_freelem(L, f, Proto);
}
void luaF_freeclosure (lua_State *L, Closure *c) {
luaM_free(L, c, sizeclosure(c->nupvalues));
}
/*
** 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->sizelocvars && 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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