[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs.
Revision 1.126 by root, Sat Nov 17 23:33:18 2018 UTC

 /*
  * This file is part of Deliantra, the Roguelike Realtime MMORPG.
  *
- * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
+ * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
  *
  * Deliantra is free software: you can redistribute it and/or modify it under
  * the terms of the Affero GNU General Public License as published by the
  * Free Software Foundation, either version 3 of the License, or (at your
  * option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the Affero GNU General Public License
  * and the GNU General Public License along with this program. If not, see
  * <http://www.gnu.org/licenses/>.
  *
  * The authors can be reached via e-mail to <support@deliantra.net>
  */
 #ifndef UTIL_H__
 #define UTIL_H__
 #endif
 // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
 #define auto(var,expr) decltype(expr) var = (expr)
-#if cplusplus_does_not_suck
+#if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */
 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
 template<typename T, int N>
 static inline int array_length (const T (&arr)[N])
 {
   return N;
 // in range excluding end
 #define IN_RANGE_EXC(val,beg,end) \
   ((unsigned int)(val) - (unsigned int)(beg) <  (unsigned int)(end) - (unsigned int)(beg))
-void cleanup (const char *cause, bool make_core = false);
+ecb_cold void cleanup (const char *cause, bool make_core = false);
-void fork_abort (const char *msg);
+ecb_cold void fork_abort (const char *msg);
 // rationale for using (U) not (T) is to reduce signed/unsigned issues,
 // as a is often a constant while b is the variable. it is still a bug, though.
-template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
+template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
-template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
+template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
 template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; }
 template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
 template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
 template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); }
 // sign0 returns -1, 0 or +1
 template<typename T>
 static inline T sign0 (T v) { return v ? sign (v) : 0; }
+//clashes with C++0x
 template<typename T, typename U>
 static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
 // div* only work correctly for div > 0
 // div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
 #if 0
 // and has a max. error of 6 in the range -100..+100.
 #else
 // and has a max. error of 9 in the range -100..+100.
 #endif
 inline int
 idistance (int dx, int dy)
 {
   unsigned int dx_ = abs (dx);
   unsigned int dy_ = abs (dy);
 #if 0
   return dx_ > dy_
 #else
   return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
 #endif
 }
+// can be substantially faster than floor, if your value range allows for it
+template<typename T>
+inline T
+fastfloor (T x)
+{
+   return std::floor (x);
+}
+inline float
+fastfloor (float x)
+{
+  return sint32(x) - (x < 0);
+}
+inline double
+fastfloor (double x)
+{
+  return sint64(x) - (x < 0);
+}
 /*
  * absdir(int): Returns a number between 1 and 8, which represent
  * the "absolute" direction of a number (it actually takes care of
  * "overflow" in previous calculations of a direction).
  */
 absdir (int d)
 {
   return ((d - 1) & 7) + 1;
 }
-// avoid ctz name because netbsd or freebsd spams it's namespace with it
-#if GCC_VERSION(3,4)
-static inline int least_significant_bit (uint32_t x)
-{
-  return __builtin_ctz (x);
-}
-#else
-int least_significant_bit (uint32_t x);
-#endif
 #define for_all_bits_sparse_32(mask, idxvar)      \
   for (uint32_t idxvar, mask_ = mask;   \
-       mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
+       mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);)
 extern ssize_t slice_alloc; // statistics
-void *salloc_ (int n)            throw (std::bad_alloc);
+void *salloc_ (int n);
-void *salloc_ (int n, void *src) throw (std::bad_alloc);
+void *salloc_ (int n, void *src);
 // strictly the same as g_slice_alloc, but never returns 0
 template<typename T>
-inline T *salloc (int n = 1)     throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T));              }
+inline T *salloc (int n = 1)     { return (T *)salloc_ (n * sizeof (T));              }
 // also copies src into the new area, like "memdup"
 // if src is 0, clears the memory
 template<typename T>
-inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); }
+inline T *salloc (int n, T *src) { return (T *)salloc_ (n * sizeof (T), (void *)src); }
 // clears the memory
 template<typename T>
-inline T *salloc0(int n = 1)     throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0);           }
+inline T *salloc0(int n = 1)     { return (T *)salloc_ (n * sizeof (T), 0);           }
 // for symmetry
 template<typename T>
-inline void sfree (T *ptr, int n = 1) throw ()
+inline void sfree (T *ptr, int n = 1) noexcept
 {
   if (expect_true (ptr))
     {
       slice_alloc -= n * sizeof (T);
       if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
       g_slice_free1 (n * sizeof (T), (void *)ptr);
-      assert (slice_alloc >= 0);//D
     }
 }
 // nulls the pointer
 template<typename T>
-inline void sfree0 (T *&ptr, int n = 1) throw ()
+inline void sfree0 (T *&ptr, int n = 1) noexcept
 {
   sfree<T> (ptr, n);
   ptr = 0;
 }
   typedef const Tp *const_pointer;
   typedef Tp &reference;
   typedef const Tp &const_reference;
   typedef Tp value_type;
   template <class U>
   struct rebind
   {
     typedef slice_allocator<U> other;
   };
-  slice_allocator () throw () { }
+  slice_allocator () noexcept { }
-  slice_allocator (const slice_allocator &) throw () { }
+  slice_allocator (const slice_allocator &) noexcept { }
   template<typename Tp2>
-  slice_allocator (const slice_allocator<Tp2> &) throw () { }
+  slice_allocator (const slice_allocator<Tp2> &) noexcept { }
   ~slice_allocator () { }
   pointer address (reference x) const { return &x; }
   const_pointer address (const_reference x) const { return &x; }
   void deallocate (pointer p, size_type n)
   {
     sfree<Tp> (p, n);
   }
-  size_type max_size () const throw ()
+  size_type max_size () const noexcept
   {
     return size_t (-1) / sizeof (Tp);
   }
   void construct (pointer p, const Tp &val)
   {
     p->~Tp ();
   }
 };
-// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
+// basically a memory area, but refcounted
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
+struct refcnt_buf
-// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
-struct tausworthe_random_generator
 {
-  uint32_t state [4];
+  char *data;
-  void operator =(const tausworthe_random_generator &src)
+  refcnt_buf (size_t size = 0);
-  {
+  refcnt_buf (void *data, size_t size);
-    state [0] = src.state [0];
-    state [1] = src.state [1];
-    state [2] = src.state [2];
-    state [3] = src.state [3];
-  }
-  void seed (uint32_t seed);
+  refcnt_buf (const refcnt_buf &src)
-  uint32_t next ();
-};
-// Xorshift RNGs, George Marsaglia
-// http://www.jstatsoft.org/v08/i14/paper
-// this one is about 40% faster than the tausworthe one above (i.e. not much),
-// despite the inlining, and has the issue of only creating 2**32-1 numbers.
-// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
-struct xorshift_random_generator
-{
-  uint32_t x, y;
-  void operator =(const xorshift_random_generator &src)
   {
-    x = src.x;
+    data = src.data;
-    y = src.y;
+    inc ();
   }
-  void seed (uint32_t seed)
+  ~refcnt_buf ();
-  {
-    x = seed;
-    y = seed * 69069U;
-  }
-  uint32_t next ()
+  refcnt_buf &operator =(const refcnt_buf &src);
+  operator char *()
   {
-    uint32_t t = x ^ (x << 10);
-    x = y;
-    y = y ^ (y >> 13) ^ t ^ (t >> 10);
-    return y;
+    return data;
   }
-};
-template<class generator>
+  size_t size () const
-struct random_number_generator : generator
-{
-  // uniform distribution, [0 .. num - 1]
-  uint32_t operator ()(uint32_t num)
   {
-    return !is_constant (num) ? get_range (num)                        // non-constant
+    return _size ();
-         : num & (num - 1)    ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
-         :                      this->next () & (num - 1);             // constant, power-of-two
-  }
-  // return a number within the closed interval [min .. max]
-  int operator () (int r_min, int r_max)
-  {
-    return is_constant (r_min <= r_max) && r_min <= r_max
-              ? r_min + operator ()(r_max - r_min + 1)
-              : get_range (r_min, r_max);
-  }
-  // return a number within the half-open interval [0..1[
-  double operator ()()
-  {
-    return this->next () / (double)0x100000000;
   }
 protected:
-  uint32_t get_range (uint32_t r_max);
+  enum {
-  int get_range (int r_min, int r_max);
+    overhead = sizeof (uint32_t) * 2
-};
+  };
-typedef random_number_generator<tausworthe_random_generator> rand_gen;
+  uint32_t &_size () const
+  {
+    return ((unsigned int *)data)[-2];
+  }
-extern rand_gen rndm, rmg_rndm;
+  uint32_t &_refcnt () const
+  {
+    return ((unsigned int *)data)[-1];
+  }
+  void _alloc (uint32_t size)
+  {
+    data = ((char *)salloc<char> (size + overhead)) + overhead;
+    _size   () = size;
+    _refcnt () = 1;
+  }
+  void _dealloc ();
+  void inc ()
+  {
+    ++_refcnt ();
+  }
+  void dec ()
+  {
+    if (!--_refcnt ())
+      _dealloc ();
+  }
+};
 INTERFACE_CLASS (attachable)
 struct refcnt_base
 {
   typedef int refcnt_t;
   // p if not null
   refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
   void refcnt_dec ()
   {
-    if (!is_constant (p))
+    if (!ecb_is_constant (p))
       --*refcnt_ref ();
     else if (p)
       --p->refcnt;
   }
   void refcnt_inc ()
   {
-    if (!is_constant (p))
+    if (!ecb_is_constant (p))
       ++*refcnt_ref ();
     else if (p)
       ++p->refcnt;
   }
   // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
   // it is about twice as fast as the one-at-a-time one,
   // with good distribution.
   // FNV-1a is faster on many cpus because the multiplication
   // runs concurrently with the looping logic.
+  // we modify the hash a bit to improve its distribution
   uint32_t hash = STRHSH_NULL;
   while (*s)
     hash = (hash ^ *s++) * 16777619U;
-  return hash;
+  return hash ^ (hash >> 16);
 }
 static inline uint32_t
 memhsh (const char *s, size_t len)
 {
   uint32_t hash = STRHSH_NULL;
   while (len--)
     hash = (hash ^ *s++) * 16777619U;
   return hash;
 }
   }
 };
 // This container blends advantages of linked lists
 // (efficiency) with vectors (random access) by
-// by using an unordered vector and storing the vector
+// using an unordered vector and storing the vector
 // index inside the object.
 //
 // + memory-efficient on most 64 bit archs
 // + O(1) insert/remove
 // + free unique (but varying) id for inserted objects
     insert (&obj);
   }
   void erase (T *obj)
   {
-    unsigned int pos = obj->*indexmember;
+    object_vector_index pos = obj->*indexmember;
     obj->*indexmember = 0;
     if (pos < this->size ())
       {
         (*this)[pos - 1] = (*this)[this->size () - 1];
   {
     erase (&obj);
   }
 };
+/////////////////////////////////////////////////////////////////////////////
+// something like a vector or stack, but without
+// out of bounds checking
+template<typename T>
+struct fixed_stack
+{
+  T *data;
+  int size;
+  int max;
+  fixed_stack ()
+  : size (0), data (0)
+  {
+  }
+  fixed_stack (int max)
+  : size (0), max (max)
+  {
+    data = salloc<T> (max);
+  }
+  void reset (int new_max)
+  {
+    sfree (data, max);
+    size = 0;
+    max = new_max;
+    data = salloc<T> (max);
+  }
+  void free ()
+  {
+    sfree (data, max);
+    data = 0;
+  }
+  ~fixed_stack ()
+  {
+    sfree (data, max);
+  }
+  T &operator[](int idx)
+  {
+    return data [idx];
+  }
+  void push (T v)
+  {
+    data [size++] = v;
+  }
+  T &pop ()
+  {
+    return data [--size];
+  }
+  T remove (int idx)
+  {
+    T v = data [idx];
+    data [idx] = data [--size];
+    return v;
+  }
+};
+/////////////////////////////////////////////////////////////////////////////
 // basically does what strncpy should do, but appends "..." to strings exceeding length
 // returns the number of bytes actually used (including \0)
 int assign (char *dst, const char *src, int maxsize);
 // type-safe version of assign
 int similar_direction (int a, int b);
 // like v?sprintf, but returns a "static" buffer
 char *vformat (const char *format, va_list ap);
-char *format (const char *format, ...) attribute ((format (printf, 1, 2)));
+char *format (const char *format, ...) ecb_attribute ((format (printf, 1, 2)));
 // safety-check player input which will become object->msg
 bool msg_is_safe (const char *msg);
 /////////////////////////////////////////////////////////////////////////////

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Comparing deliantra/server/include/util.h (file contents): Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs. Revision 1.126 by root, Sat Nov 17 23:33:18 2018 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.107 by root, Sun May 2 14:46:56 2010 UTC vs.
Revision 1.126 by root, Sat Nov 17 23:33:18 2018 UTC