2 ** $Id: lfunc.c,v 2.45 2014/11/02 19:19:04 roberto Exp $
3 ** Auxiliary functions to manipulate prototypes and closures
4 ** See Copyright Notice in lua.h
25 CClosure *luaF_newCclosure (lua_State *L, int n) {
26 GCObject *o = luaC_newobj(L, LUA_TCCL, sizeCclosure(n));
27 CClosure *c = gco2ccl(o);
28 c->nupvalues = cast_byte(n);
33 LClosure *luaF_newLclosure (lua_State *L, int n) {
34 GCObject *o = luaC_newobj(L, LUA_TLCL, sizeLclosure(n));
35 LClosure *c = gco2lcl(o);
37 c->nupvalues = cast_byte(n);
38 while (n--) c->upvals[n] = NULL;
43 ** fill a closure with new closed upvalues
45 void luaF_initupvals (lua_State *L, LClosure *cl) {
47 for (i = 0; i < cl->nupvalues; i++) {
48 UpVal *uv = luaM_new(L, UpVal);
50 uv->v = &uv->u.value; /* make it closed */
57 UpVal *luaF_findupval (lua_State *L, StkId level) {
58 UpVal **pp = &L->openupval;
61 lua_assert(isintwups(L) || L->openupval == NULL);
62 while (*pp != NULL && (p = *pp)->v >= level) {
63 lua_assert(upisopen(p));
64 if (p->v == level) /* found a corresponding upvalue? */
65 return p; /* return it */
68 /* not found: create a new upvalue */
69 uv = luaM_new(L, UpVal);
71 uv->u.open.next = *pp; /* link it to list of open upvalues */
72 uv->u.open.touched = 1;
74 uv->v = level; /* current value lives in the stack */
75 if (!isintwups(L)) { /* thread not in list of threads with upvalues? */
76 L->twups = G(L)->twups; /* link it to the list */
83 void luaF_close (lua_State *L, StkId level) {
85 while (L->openupval != NULL && (uv = L->openupval)->v >= level) {
86 lua_assert(upisopen(uv));
87 L->openupval = uv->u.open.next; /* remove from 'open' list */
88 if (uv->refcount == 0) /* no references? */
89 luaM_free(L, uv); /* free upvalue */
91 setobj(L, &uv->u.value, uv->v); /* move value to upvalue slot */
92 uv->v = &uv->u.value; /* now current value lives here */
93 luaC_upvalbarrier(L, uv);
99 Proto *luaF_newproto (lua_State *L) {
100 GCObject *o = luaC_newobj(L, LUA_TPROTO, sizeof(Proto));
119 f->lastlinedefined = 0;
125 void luaF_freeproto (lua_State *L, Proto *f) {
126 luaM_freearray(L, f->code, f->sizecode);
127 luaM_freearray(L, f->p, f->sizep);
128 luaM_freearray(L, f->k, f->sizek);
129 luaM_freearray(L, f->lineinfo, f->sizelineinfo);
130 luaM_freearray(L, f->locvars, f->sizelocvars);
131 luaM_freearray(L, f->upvalues, f->sizeupvalues);
137 ** Look for n-th local variable at line 'line' in function 'func'.
138 ** Returns NULL if not found.
140 const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
142 for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
143 if (pc < f->locvars[i].endpc) { /* is variable active? */
145 if (local_number == 0)
146 return getstr(f->locvars[i].varname);
149 return NULL; /* not found */