rope

mingw32.rar

  // _M_ref_count, and member functions _M_incr and _M_decr, which perform
  // atomic preincrement/predecrement.  The constructor initializes
  // _M_ref_count.
  struct _Refcount_Base
  {
    // The type _RC_t
    typedef size_t _RC_t;

    // The data member _M_ref_count
    volatile _RC_t _M_ref_count;

    // Constructor
    __gthread_mutex_t _M_ref_count_lock;

    _Refcount_Base(_RC_t __n) : _M_ref_count(__n), _M_ref_count_lock()
    {
#ifdef __GTHREAD_MUTEX_INIT
      __gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
      _M_ref_count_lock = __tmp;
#elif defined(__GTHREAD_MUTEX_INIT_FUNCTION)
      __GTHREAD_MUTEX_INIT_FUNCTION (&_M_ref_count_lock);
#else
#error __GTHREAD_MUTEX_INIT or __GTHREAD_MUTEX_INIT_FUNCTION should be defined by gthr.h abstraction layer, report problem to [e-mail].
#endif
    }

    void
    _M_incr()
    {
      __gthread_mutex_lock(&_M_ref_count_lock);
      ++_M_ref_count;
      __gthread_mutex_unlock(&_M_ref_count_lock);
    }

    _RC_t
    _M_decr()
    {
      __gthread_mutex_lock(&_M_ref_count_lock);
      volatile _RC_t __tmp = --_M_ref_count;
      __gthread_mutex_unlock(&_M_ref_count_lock);
      return __tmp;
    }
  };

//
// What follows should really be local to rope.  Unfortunately,
// that doesn't work, since it makes it impossible to define generic
// equality on rope iterators.  According to the draft standard, the
// template parameters for such an equality operator cannot be inferred
// from the occurrence of a member class as a parameter.
// (SGI compilers in fact allow this, but the __result wouldn't be
// portable.)
// Similarly, some of the static member functions are member functions
// only to avoid polluting the global namespace, and to circumvent
// restrictions on type inference for template functions.
//

//
// The internal data structure for representing a rope.  This is
// private to the implementation.  A rope is really just a pointer
// to one of these.
//
// A few basic functions for manipulating this data structure
// are members of _RopeRep.  Most of the more complex algorithms
// are implemented as rope members.
//
// Some of the static member functions of _RopeRep have identically
// named functions in rope that simply invoke the _RopeRep versions.

#define __ROPE_DEFINE_ALLOCS(__a) \
        __ROPE_DEFINE_ALLOC(_CharT,_Data) /* character data */ \
        typedef _Rope_RopeConcatenation<_CharT,__a> __C; \
        __ROPE_DEFINE_ALLOC(__C,_C) \
        typedef _Rope_RopeLeaf<_CharT,__a> __L; \
        __ROPE_DEFINE_ALLOC(__L,_L) \
        typedef _Rope_RopeFunction<_CharT,__a> __F; \
        __ROPE_DEFINE_ALLOC(__F,_F) \
        typedef _Rope_RopeSubstring<_CharT,__a> __S; \
        __ROPE_DEFINE_ALLOC(__S,_S)

//  Internal rope nodes potentially store a copy of the allocator
//  instance used to allocate them.  This is mostly redundant.
//  But the alternative would be to pass allocator instances around
//  in some form to nearly all internal functions, since any pointer
//  assignment may result in a zero reference count and thus require
//  deallocation.

#define __STATIC_IF_SGI_ALLOC  /* not static */

template <class _CharT, class _Alloc>
struct _Rope_rep_base
: public _Alloc
{
  typedef _Alloc allocator_type;

  allocator_type
  get_allocator() const { return *static_cast<const _Alloc*>(this); }

  _Rope_rep_base(size_t __size, const allocator_type&)
  : _M_size(__size) {}

  size_t _M_size;

# define __ROPE_DEFINE_ALLOC(_Tp, __name) \
        typedef typename \
          _Alloc::template rebind<_Tp>::other __name##Alloc; \
        static _Tp* __name##_allocate(size_t __n) \
          { return __name##Alloc().allocate(__n); } \
        static void __name##_deallocate(_Tp *__p, size_t __n) \
          { __name##Alloc().deallocate(__p, __n); }
  __ROPE_DEFINE_ALLOCS(_Alloc)
# undef __ROPE_DEFINE_ALLOC
};

namespace _Rope_constants
{
  enum { _S_max_rope_depth = 45 };
  enum _Tag {_S_leaf, _S_concat, _S_substringfn, _S_function};
}

template<class _CharT, class _Alloc>
struct _Rope_RopeRep : public _Rope_rep_base<_CharT,_Alloc>
# ifndef __GC
    , _Refcount_Base
# endif
{
    public:
    _Rope_constants::_Tag _M_tag:8;
    bool _M_is_balanced:8;
    unsigned char _M_depth;
    __GC_CONST _CharT* _M_c_string;
    __gthread_mutex_t _M_c_string_lock;
                        /* Flattened version of string, if needed.  */
                        /* typically 0.                             */
                        /* If it's not 0, then the memory is owned  */
                        /* by this node.                            */
                        /* In the case of a leaf, this may point to */
                        /* the same memory as the data field.       */
    typedef typename _Rope_rep_base<_CharT,_Alloc>::allocator_type
                        allocator_type;
    using _Rope_rep_base<_CharT,_Alloc>::get_allocator;
    _Rope_RopeRep(_Rope_constants::_Tag __t, int __d, bool __b, size_t __size,
                  allocator_type __a)
        : _Rope_rep_base<_CharT,_Alloc>(__size, __a),
#         ifndef __GC
          _Refcount_Base(1),
#         endif
          _M_tag(__t), _M_is_balanced(__b), _M_depth(__d), _M_c_string(0)
#ifdef __GTHREAD_MUTEX_INIT
    {
	// Do not copy a POSIX/gthr mutex once in use.  However, bits are bits.
	__gthread_mutex_t __tmp = __GTHREAD_MUTEX_INIT;
	_M_c_string_lock = __tmp;
    }
#else
    { __GTHREAD_MUTEX_INIT_FUNCTION (&_M_c_string_lock); }
#endif
#   ifdef __GC
        void _M_incr () {}
#   endif
        static void _S_free_string(__GC_CONST _CharT*, size_t __len,
                                   allocator_type __a);
#       define __STL_FREE_STRING(__s, __l, __a) _S_free_string(__s, __l, __a);
                        // Deallocate data section of a leaf.
                        // This shouldn't be a member function.
                        // But its hard to do anything else at the
                        // moment, because it's templatized w.r.t.
                        // an allocator.
                        // Does nothing if __GC is defined.
#   ifndef __GC
          void _M_free_c_string();
          void _M_free_tree();
                        // Deallocate t. Assumes t is not 0.
          void _M_unref_nonnil()
          {
              if (0 == _M_decr()) _M_free_tree();
          }
          void _M_ref_nonnil()
          {
              _M_incr();
          }
          static void _S_unref(_Rope_RopeRep* __t)
          {
              if (0 != __t) {
                  __t->_M_unref_nonnil();
              }
          }
          static void _S_ref(_Rope_RopeRep* __t)
          {
              if (0 != __t) __t->_M_incr();
          }
          static void _S_free_if_unref(_Rope_RopeRep* __t)
          {
              if (0 != __t && 0 == __t->_M_ref_count) __t->_M_free_tree();
          }
#   else /* __GC */
          void _M_unref_nonnil() {}
          void _M_ref_nonnil() {}
          static void _S_unref(_Rope_RopeRep*) {}
          static void _S_ref(_Rope_RopeRep*) {}
          static void _S_free_if_unref(_Rope_RopeRep*) {}
#   endif
protected:
  _Rope_RopeRep&
  operator=(const _Rope_RopeRep&);

  _Rope_RopeRep(const _Rope_RopeRep&);
};

template<class _CharT, class _Alloc>
struct _Rope_RopeLeaf : public _Rope_RopeRep<_CharT,_Alloc> {
  public:
    // Apparently needed by VC++
    // The data fields of leaves are allocated with some
    // extra space, to accommodate future growth and for basic
    // character types, to hold a trailing eos character.
    enum { _S_alloc_granularity = 8 };
    static size_t _S_rounded_up_size(size_t __n) {
        size_t __size_with_eos;

        if (_S_is_basic_char_type((_CharT*)0)) {
            __size_with_eos = __n + 1;
        } else {
            __size_with_eos = __n;
        }
#       ifdef __GC
           return __size_with_eos;
#       else
           // Allow slop for in-place expansion.
           return (__size_with_eos + _S_alloc_granularity-1)
                        &~ (_S_alloc_granularity-1);
#       endif
    }
    __GC_CONST _CharT* _M_data; /* Not necessarily 0 terminated. */
                                /* The allocated size is         */
                                /* _S_rounded_up_size(size), except */
                                /* in the GC case, in which it   */
                                /* doesn't matter.               */
    typedef typename _Rope_rep_base<_CharT,_Alloc>::allocator_type
                        allocator_type;
    _Rope_RopeLeaf(__GC_CONST _CharT* __d, size_t __size, allocator_type __a)
        : _Rope_RopeRep<_CharT,_Alloc>(_Rope_constants::_S_leaf, 0, true, __size, __a), _M_data(__d)
        {
        if (_S_is_basic_char_type((_CharT *)0)) {
            // already eos terminated.
            this->_M_c_string = __d;
        }
    }
        // The constructor assumes that d has been allocated with
        // the proper allocator and the properly padded size.
        // In contrast, the destructor deallocates the data:
# ifndef __GC
    ~_Rope_RopeLeaf() throw() {
        if (_M_data != this->_M_c_string) {
	  this->_M_free_c_string();
        }
        __STL_FREE_STRING(_M_data, this->_M_size, this->get_allocator());
    }
# endif
protected:
  _Rope_RopeLeaf&
  operator=(const _Rope_RopeLeaf&);

  _Rope_RopeLeaf(const _Rope_RopeLeaf&);
};

template<class _CharT, class _Alloc>
struct _Rope_RopeConcatenation : public _Rope_RopeRep<_CharT,_Alloc> {
  public:
    _Rope_RopeRep<_CharT,_Alloc>* _M_left;
    _Rope_RopeRep<_CharT,_Alloc>* _M_right;
    typedef typename _Rope_rep_base<_CharT,_Alloc>::allocator_type
                        allocator_type;
    _Rope_RopeConcatenation(_Rope_RopeRep<_CharT,_Alloc>* __l,
                             _Rope_RopeRep<_CharT,_Alloc>* __r,
                             allocator_type __a)

      : _Rope_RopeRep<_CharT,_Alloc>(_Rope_constants::_S_concat,
                                     std::max(__l->_M_depth, __r->_M_depth) + 1,
                                     false,
                                     __l->_M_size + __r->_M_size, __a),
        _M_left(__l), _M_right(__r)
      {}
# ifndef __GC
    ~_Rope_RopeConcatenation() throw() {
      this->_M_free_c_string();
      _M_left->_M_unref_nonnil();
      _M_right->_M_unref_nonnil();
    }
# endif
protected:
  _Rope_RopeConcatenation&
  operator=(const _Rope_RopeConcatenation&);

  _Rope_RopeConcatenation(const _Rope_RopeConcatenation&);
};

template<class _CharT, class _Alloc>
struct _Rope_RopeFunction : public _Rope_RopeRep<_CharT,_Alloc> {
  public:
    char_producer<_CharT>* _M_fn;
#   ifndef __GC
      bool _M_delete_when_done; // Char_producer is owned by the
                                // rope and should be explicitly
                                // deleted when the rope becomes
                                // inaccessible.
#   else
      // In the GC case, we either register the rope for
      // finalization, or not.  Thus the field is unnecessary;
      // the information is stored in the collector data structures.
      // We do need a finalization procedure to be invoked by the
      // collector.
      static void _S_fn_finalization_proc(void * __tree, void *) {
        delete ((_Rope_RopeFunction *)__tree) -> _M_fn;
      }
#   endif
    typedef typename _Rope_rep_base<_CharT,_Alloc>::allocator_type
                                        allocator_type;
    _Rope_RopeFunction(char_producer<_CharT>* __f, size_t __size,
                        bool __d, allocator_type __a)
      : _Rope_RopeRep<_CharT,_Alloc>(_Rope_constants::_S_function,
				     0, true, __size, __a)
      , _M_fn(__f)
#       ifndef __GC
      , _M_delete_when_done(__d)
#       endif
    {
#       ifdef __GC
            if (__d) {
                GC_REGISTER_FINALIZER(
                  this, _Rope_RopeFunction::_S_fn_finalization_proc, 0, 0, 0);
            }
#       endif
    }
# ifndef __GC
    ~_Rope_RopeFunction() throw() {
          this->_M_free_c_string();
          if (_M_delete_when_done) {
              delete _M_fn;
          }
    }
# endif
protected:
  _Rope_RopeFunction&
  operator=(const _Rope_RopeFunction&);

  _Rope_RopeFunction(const _Rope_RopeFunction&);