mirror of
https://github.com/lua/lua.git
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135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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** $Id: lfunc.c,v 1.64 2002/12/04 17:38:31 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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#define lfunc_c
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#include "lua.h"
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#include "lfunc.h"
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#include "lgc.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
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cast(int, sizeof(TObject)*((n)-1)))
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#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
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cast(int, sizeof(TObject *)*((n)-1)))
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Closure *luaF_newCclosure (lua_State *L, int nelems) {
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Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
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luaC_link(L, valtogco(c), LUA_TFUNCTION);
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c->c.isC = 1;
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c->c.nupvalues = cast(lu_byte, nelems);
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return c;
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}
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Closure *luaF_newLclosure (lua_State *L, int nelems, TObject *gt) {
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Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
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luaC_link(L, valtogco(c), LUA_TFUNCTION);
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c->l.isC = 0;
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c->l.g = *gt;
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c->l.nupvalues = cast(lu_byte, nelems);
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return c;
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}
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UpVal *luaF_findupval (lua_State *L, StkId level) {
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GCObject **pp = &L->openupval;
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UpVal *p;
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UpVal *v;
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while ((p = ngcotouv(*pp)) != NULL && p->v >= level) {
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if (p->v == level) return p;
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pp = &p->next;
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}
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v = luaM_new(L, UpVal); /* not found: create a new one */
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v->tt = LUA_TUPVAL;
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v->marked = 1; /* open upvalues should not be collected */
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v->v = level; /* current value lives in the stack */
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v->next = *pp; /* chain it in the proper position */
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*pp = valtogco(v);
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return v;
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}
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void luaF_close (lua_State *L, StkId level) {
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UpVal *p;
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while ((p = ngcotouv(L->openupval)) != NULL && p->v >= level) {
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setobj(&p->value, p->v); /* save current value (write barrier) */
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p->v = &p->value; /* now current value lives here */
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L->openupval = p->next; /* remove from `open' list */
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luaC_link(L, valtogco(p), LUA_TUPVAL);
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}
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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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luaC_link(L, valtogco(f), LUA_TPROTO);
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f->k = NULL;
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f->sizek = 0;
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f->p = NULL;
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f->sizep = 0;
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f->code = NULL;
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f->sizecode = 0;
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f->sizelineinfo = 0;
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f->nupvalues = 0;
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f->upvalues = NULL;
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f->numparams = 0;
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f->is_vararg = 0;
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f->maxstacksize = 0;
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f->lineinfo = NULL;
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f->sizelocvars = 0;
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f->locvars = NULL;
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f->lineDefined = 0;
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f->source = NULL;
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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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luaM_freearray(L, f->code, f->sizecode, Instruction);
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luaM_freearray(L, f->p, f->sizep, Proto *);
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luaM_freearray(L, f->k, f->sizek, TObject);
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luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
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luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
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luaM_freearray(L, f->upvalues, f->nupvalues, TString *);
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luaM_freelem(L, f);
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}
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void luaF_freeclosure (lua_State *L, Closure *c) {
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int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
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sizeLclosure(c->l.nupvalues);
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luaM_free(L, c, size);
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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->sizelocvars && 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 getstr(f->locvars[i].varname);
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}
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}
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return NULL; /* not found */
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}
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