FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lfunc.c

     /*
     ** $Id: lfunc.c,v 2.30.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Auxiliary functions to manipulate prototypes and closures
     ** See Copyright Notice in lua.h
     */
     
     
     #define lfunc_c
     #define LUA_CORE
    
    #include <sys/lua/lua.h>
    
    #include "lfunc.h"
    #include "lgc.h"
    #include "lmem.h"
    #include "lobject.h"
    #include "lstate.h"
    
    
    
    Closure *luaF_newCclosure (lua_State *L, int n) {
      Closure *c = &luaC_newobj(L, LUA_TCCL, sizeCclosure(n), NULL, 0)->cl;
      c->c.nupvalues = cast_byte(n);
      return c;
    }
    
    
    Closure *luaF_newLclosure (lua_State *L, int n) {
      Closure *c = &luaC_newobj(L, LUA_TLCL, sizeLclosure(n), NULL, 0)->cl;
      c->l.p = NULL;
      c->l.nupvalues = cast_byte(n);
      while (n--) c->l.upvals[n] = NULL;
      return c;
    }
    
    
    UpVal *luaF_newupval (lua_State *L) {
      UpVal *uv = &luaC_newobj(L, LUA_TUPVAL, sizeof(UpVal), NULL, 0)->uv;
      uv->v = &uv->u.value;
      setnilvalue(uv->v);
      return uv;
    }
    
    
    UpVal *luaF_findupval (lua_State *L, StkId level) {
      global_State *g = G(L);
      GCObject **pp = &L->openupval;
      UpVal *p;
      UpVal *uv;
      while (*pp != NULL && (p = gco2uv(*pp))->v >= level) {
        GCObject *o = obj2gco(p);
        lua_assert(p->v != &p->u.value);
        lua_assert(!isold(o) || isold(obj2gco(L)));
        if (p->v == level) {  /* found a corresponding upvalue? */
          if (isdead(g, o))  /* is it dead? */
            changewhite(o);  /* resurrect it */
          return p;
        }
        pp = &p->next;
      }
      /* not found: create a new one */
      uv = &luaC_newobj(L, LUA_TUPVAL, sizeof(UpVal), pp, 0)->uv;
      uv->v = level;  /* current value lives in the stack */
      uv->u.l.prev = &g->uvhead;  /* double link it in `uvhead' list */
      uv->u.l.next = g->uvhead.u.l.next;
      uv->u.l.next->u.l.prev = uv;
      g->uvhead.u.l.next = uv;
      lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
      return uv;
    }
    
    
    static void unlinkupval (UpVal *uv) {
      lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
      uv->u.l.next->u.l.prev = uv->u.l.prev;  /* remove from `uvhead' list */
      uv->u.l.prev->u.l.next = uv->u.l.next;
    }
    
    
    void luaF_freeupval (lua_State *L, UpVal *uv) {
      if (uv->v != &uv->u.value)  /* is it open? */
        unlinkupval(uv);  /* remove from open list */
      luaM_free(L, uv);  /* free upvalue */
    }
    
    
    void luaF_close (lua_State *L, StkId level) {
      UpVal *uv;
      global_State *g = G(L);
      while (L->openupval != NULL && (uv = gco2uv(L->openupval))->v >= level) {
        GCObject *o = obj2gco(uv);
        lua_assert(!isblack(o) && uv->v != &uv->u.value);
        L->openupval = uv->next;  /* remove from `open' list */
        if (isdead(g, o))
          luaF_freeupval(L, uv);  /* free upvalue */
        else {
          unlinkupval(uv);  /* remove upvalue from 'uvhead' list */
          setobj(L, &uv->u.value, uv->v);  /* move value to upvalue slot */
          uv->v = &uv->u.value;  /* now current value lives here */
         gch(o)->next = g->allgc;  /* link upvalue into 'allgc' list */
         g->allgc = o;
         luaC_checkupvalcolor(g, uv);
       }
     }
   }
   
   
   Proto *luaF_newproto (lua_State *L) {
     Proto *f = &luaC_newobj(L, LUA_TPROTO, sizeof(Proto), NULL, 0)->p;
     f->k = NULL;
     f->sizek = 0;
     f->p = NULL;
     f->sizep = 0;
     f->code = NULL;
     f->cache = NULL;
     f->sizecode = 0;
     f->lineinfo = NULL;
     f->sizelineinfo = 0;
     f->upvalues = NULL;
     f->sizeupvalues = 0;
     f->numparams = 0;
     f->is_vararg = 0;
     f->maxstacksize = 0;
     f->locvars = NULL;
     f->sizelocvars = 0;
     f->linedefined = 0;
     f->lastlinedefined = 0;
     f->source = NULL;
     return f;
   }
   
   
   void luaF_freeproto (lua_State *L, Proto *f) {
     luaM_freearray(L, f->code, f->sizecode);
     luaM_freearray(L, f->p, f->sizep);
     luaM_freearray(L, f->k, f->sizek);
     luaM_freearray(L, f->lineinfo, f->sizelineinfo);
     luaM_freearray(L, f->locvars, f->sizelocvars);
     luaM_freearray(L, f->upvalues, f->sizeupvalues);
     luaM_free(L, f);
   }
   
   
   /*
   ** 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 getstr(f->locvars[i].varname);
       }
     }
     return NULL;  /* not found */
   }

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