FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lmem.h

     /*
     ** $Id: lmem.h,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Interface to Memory Manager
     ** See Copyright Notice in lua.h
     */
     
     #ifndef lmem_h
     #define lmem_h
     
    
    #include "llimits.h"
    #include <sys/lua/lua.h>
    
    
    /*
    ** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is
    ** always constant.
    ** The macro is somewhat complex to avoid warnings:
    ** +1 avoids warnings of "comparison has constant result";
    ** cast to 'void' avoids warnings of "value unused".
    */
    #define luaM_reallocv(L,b,on,n,e) \
      (cast(void, \
         (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
       luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
    
    #define luaM_freemem(L, b, s)   luaM_realloc_(L, (b), (s), 0)
    #define luaM_free(L, b)         luaM_realloc_(L, (b), sizeof(*(b)), 0)
    #define luaM_freearray(L, b, n)   luaM_reallocv(L, (b), n, 0, sizeof((b)[0]))
    
    #define luaM_malloc(L,s)        luaM_realloc_(L, NULL, 0, (s))
    #define luaM_new(L,t)           cast(t *, luaM_malloc(L, sizeof(t)))
    #define luaM_newvector(L,n,t) \
                    cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
    
    #define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s))
    
    #define luaM_growvector(L,v,nelems,size,t,limit,e) \
              if ((nelems)+1 > (size)) \
                ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
    
    #define luaM_reallocvector(L, v,oldn,n,t) \
       ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
    
    LUAI_FUNC l_noret luaM_toobig (lua_State *L);
    
    /* not to be called directly */
    LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
                                                              size_t size);
    LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
                                   size_t size_elem, int limit,
                                   const char *what);
    
    #endif

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