510 lines
13 KiB
C++
510 lines
13 KiB
C++
/*
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* Copyright © 2017,2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_VECTOR_HH
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#define HB_VECTOR_HH
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#include "hb.hh"
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#include "hb-array.hh"
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#include "hb-meta.hh"
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#include "hb-null.hh"
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template <typename Type,
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bool sorted=false>
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struct hb_vector_t
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{
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typedef Type item_t;
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static constexpr unsigned item_size = hb_static_size (Type);
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using array_t = typename std::conditional<sorted, hb_sorted_array_t<Type>, hb_array_t<Type>>::type;
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using c_array_t = typename std::conditional<sorted, hb_sorted_array_t<const Type>, hb_array_t<const Type>>::type;
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hb_vector_t () = default;
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hb_vector_t (std::initializer_list<Type> lst) : hb_vector_t ()
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{
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alloc (lst.size (), true);
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for (auto&& item : lst)
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push (item);
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}
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template <typename Iterable,
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hb_requires (hb_is_iterable (Iterable))>
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hb_vector_t (const Iterable &o) : hb_vector_t ()
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{
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auto iter = hb_iter (o);
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if (iter.is_random_access_iterator)
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alloc (hb_len (iter), true);
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hb_copy (iter, *this);
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}
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hb_vector_t (const hb_vector_t &o) : hb_vector_t ()
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{
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alloc (o.length, true);
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if (unlikely (in_error ())) return;
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copy_vector (o);
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}
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hb_vector_t (hb_vector_t &&o)
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{
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allocated = o.allocated;
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length = o.length;
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arrayZ = o.arrayZ;
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o.init ();
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}
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~hb_vector_t () { fini (); }
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public:
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int allocated = 0; /* == -1 means allocation failed. */
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unsigned int length = 0;
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public:
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Type *arrayZ = nullptr;
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void init ()
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{
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allocated = length = 0;
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arrayZ = nullptr;
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}
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void init0 ()
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{
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}
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void fini ()
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{
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shrink_vector (0);
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hb_free (arrayZ);
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init ();
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}
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void reset ()
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{
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if (unlikely (in_error ()))
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/* Big Hack! We don't know the true allocated size before
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* an allocation failure happened. But we know it was at
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* least as big as length. Restore it to that and continue
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* as if error did not happen. */
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allocated = length;
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resize (0);
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}
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friend void swap (hb_vector_t& a, hb_vector_t& b)
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{
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hb_swap (a.allocated, b.allocated);
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hb_swap (a.length, b.length);
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hb_swap (a.arrayZ, b.arrayZ);
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}
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hb_vector_t& operator = (const hb_vector_t &o)
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{
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reset ();
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alloc (o.length, true);
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if (unlikely (in_error ())) return *this;
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copy_vector (o);
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return *this;
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}
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hb_vector_t& operator = (hb_vector_t &&o)
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{
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hb_swap (*this, o);
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return *this;
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}
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hb_bytes_t as_bytes () const
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{ return hb_bytes_t ((const char *) arrayZ, get_size ()); }
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bool operator == (const hb_vector_t &o) const { return as_array () == o.as_array (); }
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bool operator != (const hb_vector_t &o) const { return !(*this == o); }
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uint32_t hash () const { return as_array ().hash (); }
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Type& operator [] (int i_)
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{
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unsigned int i = (unsigned int) i_;
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if (unlikely (i >= length))
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return Crap (Type);
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return arrayZ[i];
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}
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const Type& operator [] (int i_) const
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{
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unsigned int i = (unsigned int) i_;
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if (unlikely (i >= length))
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return Null (Type);
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return arrayZ[i];
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}
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Type& tail () { return (*this)[length - 1]; }
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const Type& tail () const { return (*this)[length - 1]; }
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explicit operator bool () const { return length; }
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unsigned get_size () const { return length * item_size; }
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/* Sink interface. */
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template <typename T>
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hb_vector_t& operator << (T&& v) { push (std::forward<T> (v)); return *this; }
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array_t as_array () { return hb_array (arrayZ, length); }
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c_array_t as_array () const { return hb_array (arrayZ, length); }
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/* Iterator. */
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typedef c_array_t iter_t;
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typedef array_t writer_t;
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iter_t iter () const { return as_array (); }
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writer_t writer () { return as_array (); }
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operator iter_t () const { return iter (); }
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operator writer_t () { return writer (); }
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/* Faster range-based for loop. */
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Type *begin () const { return arrayZ; }
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Type *end () const { return arrayZ + length; }
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hb_sorted_array_t<Type> as_sorted_array ()
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{ return hb_sorted_array (arrayZ, length); }
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hb_sorted_array_t<const Type> as_sorted_array () const
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{ return hb_sorted_array (arrayZ, length); }
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template <typename T> explicit operator T * () { return arrayZ; }
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template <typename T> explicit operator const T * () const { return arrayZ; }
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Type * operator + (unsigned int i) { return arrayZ + i; }
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const Type * operator + (unsigned int i) const { return arrayZ + i; }
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Type *push ()
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{
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if (unlikely (!resize (length + 1)))
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return &Crap (Type);
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return std::addressof (arrayZ[length - 1]);
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}
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template <typename T,
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typename T2 = Type,
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hb_enable_if (!std::is_copy_constructible<T2>::value &&
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std::is_copy_assignable<T>::value)>
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Type *push (T&& v)
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{
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Type *p = push ();
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if (p == &Crap (Type))
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// If push failed to allocate then don't copy v, since this may cause
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// the created copy to leak memory since we won't have stored a
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// reference to it.
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return p;
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*p = std::forward<T> (v);
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return p;
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}
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template <typename T,
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typename T2 = Type,
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hb_enable_if (std::is_copy_constructible<T2>::value)>
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Type *push (T&& v)
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{
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if (unlikely (!alloc (length + 1)))
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// If push failed to allocate then don't copy v, since this may cause
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// the created copy to leak memory since we won't have stored a
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// reference to it.
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return &Crap (Type);
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/* Emplace. */
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length++;
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Type *p = std::addressof (arrayZ[length - 1]);
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return new (p) Type (std::forward<T> (v));
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}
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bool in_error () const { return allocated < 0; }
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template <typename T = Type,
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hb_enable_if (hb_is_trivially_copy_assignable(T))>
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Type *
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realloc_vector (unsigned new_allocated)
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{
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if (!new_allocated)
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{
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hb_free (arrayZ);
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return nullptr;
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}
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return (Type *) hb_realloc (arrayZ, new_allocated * sizeof (Type));
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}
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template <typename T = Type,
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hb_enable_if (!hb_is_trivially_copy_assignable(T))>
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Type *
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realloc_vector (unsigned new_allocated)
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{
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if (!new_allocated)
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{
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hb_free (arrayZ);
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return nullptr;
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}
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Type *new_array = (Type *) hb_malloc (new_allocated * sizeof (Type));
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if (likely (new_array))
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{
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for (unsigned i = 0; i < length; i++)
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{
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new (std::addressof (new_array[i])) Type ();
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new_array[i] = std::move (arrayZ[i]);
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arrayZ[i].~Type ();
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}
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hb_free (arrayZ);
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}
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return new_array;
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}
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template <typename T = Type,
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hb_enable_if (hb_is_trivially_constructible(T))>
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void
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grow_vector (unsigned size)
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{
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memset (arrayZ + length, 0, (size - length) * sizeof (*arrayZ));
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length = size;
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}
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template <typename T = Type,
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hb_enable_if (!hb_is_trivially_constructible(T))>
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void
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grow_vector (unsigned size)
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{
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while (length < size)
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{
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length++;
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new (std::addressof (arrayZ[length - 1])) Type ();
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}
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}
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template <typename T = Type,
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hb_enable_if (hb_is_trivially_copyable (T))>
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void
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copy_vector (const hb_vector_t &other)
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{
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length = other.length;
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#ifndef HB_OPTIMIZE_SIZE
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if (sizeof (T) >= sizeof (long long))
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/* This runs faster because of alignment. */
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for (unsigned i = 0; i < length; i++)
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arrayZ[i] = other.arrayZ[i];
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else
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#endif
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hb_memcpy ((void *) arrayZ, (const void *) other.arrayZ, length * item_size);
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}
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template <typename T = Type,
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hb_enable_if (!hb_is_trivially_copyable (T) &&
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std::is_copy_constructible<T>::value)>
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void
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copy_vector (const hb_vector_t &other)
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{
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length = 0;
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while (length < other.length)
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{
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length++;
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new (std::addressof (arrayZ[length - 1])) Type (other.arrayZ[length - 1]);
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}
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}
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template <typename T = Type,
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hb_enable_if (!hb_is_trivially_copyable (T) &&
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!std::is_copy_constructible<T>::value &&
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std::is_default_constructible<T>::value &&
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std::is_copy_assignable<T>::value)>
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void
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copy_vector (const hb_vector_t &other)
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{
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length = 0;
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while (length < other.length)
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{
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length++;
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new (std::addressof (arrayZ[length - 1])) Type ();
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arrayZ[length - 1] = other.arrayZ[length - 1];
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}
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}
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void
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shrink_vector (unsigned size)
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{
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while ((unsigned) length > size)
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{
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arrayZ[(unsigned) length - 1].~Type ();
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length--;
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}
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}
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void
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shift_down_vector (unsigned i)
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{
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for (; i < length; i++)
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arrayZ[i - 1] = std::move (arrayZ[i]);
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}
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/* Allocate for size but don't adjust length. */
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bool alloc (unsigned int size, bool exact=false)
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{
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if (unlikely (in_error ()))
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return false;
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unsigned int new_allocated;
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if (exact)
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{
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/* If exact was specified, we allow shrinking the storage. */
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size = hb_max (size, length);
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if (size <= (unsigned) allocated &&
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size >= (unsigned) allocated >> 2)
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return true;
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new_allocated = size;
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}
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else
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{
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if (likely (size <= (unsigned) allocated))
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return true;
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new_allocated = allocated;
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while (size > new_allocated)
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new_allocated += (new_allocated >> 1) + 8;
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}
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/* Reallocate */
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bool overflows =
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(int) in_error () ||
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(new_allocated < size) ||
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hb_unsigned_mul_overflows (new_allocated, sizeof (Type));
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if (unlikely (overflows))
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{
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allocated = -1;
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return false;
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}
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Type *new_array = realloc_vector (new_allocated);
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if (unlikely (new_allocated && !new_array))
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{
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if (new_allocated <= (unsigned) allocated)
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return true; // shrinking failed; it's okay; happens in our fuzzer
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allocated = -1;
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return false;
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}
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arrayZ = new_array;
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allocated = new_allocated;
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return true;
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}
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bool resize (int size_, bool initialize = true, bool exact = false)
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{
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unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
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if (!alloc (size, exact))
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return false;
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if (size > length)
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{
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if (initialize)
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grow_vector (size);
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}
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else if (size < length)
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{
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if (initialize)
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shrink_vector (size);
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}
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length = size;
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return true;
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}
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bool resize_exact (int size_, bool initialize = true)
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{
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return resize (size_, initialize, true);
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}
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Type pop ()
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{
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if (!length) return Null (Type);
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Type v {std::move (arrayZ[length - 1])};
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arrayZ[length - 1].~Type ();
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length--;
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return v;
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}
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void remove_ordered (unsigned int i)
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{
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if (unlikely (i >= length))
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return;
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shift_down_vector (i + 1);
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arrayZ[length - 1].~Type ();
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length--;
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}
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template <bool Sorted = sorted,
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hb_enable_if (!Sorted)>
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void remove_unordered (unsigned int i)
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{
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if (unlikely (i >= length))
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return;
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if (i != length - 1)
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arrayZ[i] = std::move (arrayZ[length - 1]);
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arrayZ[length - 1].~Type ();
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length--;
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}
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void shrink (int size_)
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{
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unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
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if (size >= length)
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return;
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shrink_vector (size);
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alloc (size, true); /* To force shrinking memory if needed. */
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}
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/* Sorting API. */
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void qsort (int (*cmp)(const void*, const void*) = Type::cmp)
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{ as_array ().qsort (cmp); }
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/* Unsorted search API. */
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template <typename T>
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Type *lsearch (const T &x, Type *not_found = nullptr)
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{ return as_array ().lsearch (x, not_found); }
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template <typename T>
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const Type *lsearch (const T &x, const Type *not_found = nullptr) const
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{ return as_array ().lsearch (x, not_found); }
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template <typename T>
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bool lfind (const T &x, unsigned *pos = nullptr) const
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{ return as_array ().lfind (x, pos); }
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/* Sorted search API. */
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template <typename T,
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bool Sorted=sorted, hb_enable_if (Sorted)>
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Type *bsearch (const T &x, Type *not_found = nullptr)
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{ return as_array ().bsearch (x, not_found); }
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template <typename T,
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bool Sorted=sorted, hb_enable_if (Sorted)>
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const Type *bsearch (const T &x, const Type *not_found = nullptr) const
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{ return as_array ().bsearch (x, not_found); }
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template <typename T,
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bool Sorted=sorted, hb_enable_if (Sorted)>
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bool bfind (const T &x, unsigned int *i = nullptr,
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hb_not_found_t not_found = HB_NOT_FOUND_DONT_STORE,
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unsigned int to_store = (unsigned int) -1) const
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{ return as_array ().bfind (x, i, not_found, to_store); }
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};
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template <typename Type>
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using hb_sorted_vector_t = hb_vector_t<Type, true>;
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#endif /* HB_VECTOR_HH */
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