mirror of
https://github.com/lua/lua.git
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140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
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** $Id: lfunc.c,v 2.37 2013/08/27 20:04:00 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 <stddef.h>
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#define lfunc_c
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#define LUA_CORE
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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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Closure *luaF_newCclosure (lua_State *L, int n) {
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Closure *c = &luaC_newobj(L, LUA_TCCL, sizeCclosure(n))->cl;
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c->c.nupvalues = cast_byte(n);
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return c;
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}
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Closure *luaF_newLclosure (lua_State *L, int n) {
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Closure *c = &luaC_newobj(L, LUA_TLCL, sizeLclosure(n))->cl;
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c->l.p = NULL;
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c->l.nupvalues = cast_byte(n);
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while (n--) c->l.upvals[n] = NULL;
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return c;
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}
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void luaF_initupvals (lua_State *L, LClosure *cl) {
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int i;
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for (i = 0; i < cl->nupvalues; i++) {
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UpVal *uv = luaM_new(L, UpVal);
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uv->refcount = 1;
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uv->v = &uv->u.value; /* make it closed */
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setnilvalue(uv->v);
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cl->upvals[i] = uv;
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}
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}
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UpVal *luaF_findupval (lua_State *L, StkId level) {
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UpVal **pp = &L->openupval;
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UpVal *p;
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UpVal *uv;
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while (*pp != NULL && (p = *pp)->v >= level) {
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lua_assert(upisopen(p));
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if (p->v == level) /* found a corresponding upvalue? */
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return p; /* return it */
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pp = &p->u.op.next;
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}
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/* not found: create a new one */
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uv = luaM_new(L, UpVal);
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uv->refcount = 0;
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uv->u.op.next = *pp;
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*pp = uv;
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uv->v = level; /* current value lives in the stack */
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return uv;
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}
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void luaF_close (lua_State *L, StkId level) {
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UpVal *uv;
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while (L->openupval != NULL && (uv = L->openupval)->v >= level) {
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lua_assert(upisopen(uv));
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L->openupval = uv->u.op.next; /* remove from `open' list */
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if (uv->refcount == 0) /* no references? */
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luaM_free(L, uv); /* free upvalue */
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else {
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setobj(L, &uv->u.value, uv->v); /* move value to upvalue slot */
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uv->v = &uv->u.value; /* now current value lives here */
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luaC_upvalbarrier(L, uv);
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}
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}
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}
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Proto *luaF_newproto (lua_State *L) {
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Proto *f = &luaC_newobj(L, LUA_TPROTO, sizeof(Proto))->p;
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nolocal(obj2gco(f)); /* prototypes are never local */
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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->cache = NULL;
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f->sizecode = 0;
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f->lineinfo = NULL;
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f->sizelineinfo = 0;
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f->upvalues = NULL;
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f->sizeupvalues = 0;
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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->locvars = NULL;
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f->sizelocvars = 0;
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f->linedefined = 0;
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f->lastlinedefined = 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);
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luaM_freearray(L, f->p, f->sizep);
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luaM_freearray(L, f->k, f->sizek);
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luaM_freearray(L, f->lineinfo, f->sizelineinfo);
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luaM_freearray(L, f->locvars, f->sizelocvars);
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luaM_freearray(L, f->upvalues, f->sizeupvalues);
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luaM_free(L, f);
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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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