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18b8b499de
If all your callers already initialize the array element as needed, then we don't need to memset it to zero first. This is pretty useful for the snapshot state stack, because due to the per-node-type data area the elements on the stack are quite large, but often a lot of it is not used.
286 lines
6.7 KiB
C
286 lines
6.7 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include <glib.h>
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G_BEGIN_DECLS
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#ifndef GDK_ARRAY_TYPE_NAME
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#define GDK_ARRAY_TYPE_NAME GdkArray
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#endif
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#ifndef GDK_ARRAY_NAME
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#define GDK_ARRAY_NAME gdk_array
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#endif
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#ifndef GDK_ARRAY_ELEMENT_TYPE
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#define GDK_ARRAY_ELEMENT_TYPE gpointer
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#endif
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#ifdef GDK_ARRAY_PREALLOC
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#if GDK_ARRAY_PREALLOC == 0
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#undef GDK_ARRAY_PREALLOC
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#endif
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#endif
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#ifdef GDK_ARRAY_NULL_TERMINATED
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#define GDK_ARRAY_REAL_SIZE(_size) ((_size) + 1)
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#else
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#define GDK_ARRAY_REAL_SIZE(_size) (_size)
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#endif
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/* make this readable */
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#define _T_ GDK_ARRAY_ELEMENT_TYPE
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#define GdkArray GDK_ARRAY_TYPE_NAME
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#define gdk_array_paste_more(GDK_ARRAY_NAME, func_name) GDK_ARRAY_NAME ## _ ## func_name
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#define gdk_array_paste(GDK_ARRAY_NAME, func_name) gdk_array_paste_more (GDK_ARRAY_NAME, func_name)
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#define gdk_array(func_name) gdk_array_paste (GDK_ARRAY_NAME, func_name)
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typedef struct GdkArray GdkArray;
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struct GdkArray
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{
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_T_ *start;
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_T_ *end;
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_T_ *end_allocation;
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#ifdef GDK_ARRAY_PREALLOC
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_T_ preallocated[GDK_ARRAY_REAL_SIZE(GDK_ARRAY_PREALLOC)];
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#endif
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};
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/* no G_GNUC_UNUSED here, if you don't use an array type, remove it. */
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static inline void
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gdk_array(init) (GdkArray *self)
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{
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#ifdef GDK_ARRAY_PREALLOC
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self->start = self->preallocated;
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self->end = self->start;
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self->end_allocation = self->start + GDK_ARRAY_PREALLOC;
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#ifdef GDK_ARRAY_NULL_TERMINATED
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*self->start = *(_T_[1]) { 0 };
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#endif
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#else
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self->start = NULL;
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self->end = NULL;
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self->end_allocation = NULL;
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#endif
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}
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static inline void
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gdk_array(free_elements) (_T_ *start,
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_T_ *end)
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{
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#ifdef GDK_ARRAY_FREE_FUNC
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_T_ *e;
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for (e = start; e < end; e++)
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#ifdef GDK_ARRAY_BY_VALUE
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GDK_ARRAY_FREE_FUNC (e);
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#else
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GDK_ARRAY_FREE_FUNC (*e);
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#endif
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#endif
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}
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/* no G_GNUC_UNUSED here */
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static inline void
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gdk_array(clear) (GdkArray *self)
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{
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gdk_array(free_elements) (self->start, self->end);
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#ifdef GDK_ARRAY_PREALLOC
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if (self->start != self->preallocated)
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#endif
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g_free (self->start);
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gdk_array(init) (self);
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}
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G_GNUC_UNUSED static inline _T_ *
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gdk_array(get_data) (const GdkArray *self)
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{
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return self->start;
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}
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G_GNUC_UNUSED static inline _T_ *
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gdk_array(index) (const GdkArray *self,
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gsize pos)
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{
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return self->start + pos;
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}
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G_GNUC_UNUSED static inline gsize
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gdk_array(get_capacity) (const GdkArray *self)
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{
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return self->end_allocation - self->start;
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}
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G_GNUC_UNUSED static inline gsize
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gdk_array(get_size) (const GdkArray *self)
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{
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return self->end - self->start;
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}
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G_GNUC_UNUSED static inline gboolean
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gdk_array(is_empty) (const GdkArray *self)
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{
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return self->end == self->start;
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}
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G_GNUC_UNUSED static inline void
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gdk_array(reserve) (GdkArray *self,
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gsize n)
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{
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gsize new_size, size;
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if (n <= gdk_array(get_capacity) (self))
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return;
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size = gdk_array(get_size) (self);
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new_size = 1 << g_bit_storage (MAX (GDK_ARRAY_REAL_SIZE (n), 16) - 1);
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#ifdef GDK_ARRAY_PREALLOC
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if (self->start == self->preallocated)
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{
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self->start = g_new (_T_, new_size);
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memcpy (self->start, self->preallocated, sizeof (_T_) * GDK_ARRAY_REAL_SIZE (size));
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}
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else
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#endif
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#ifdef GDK_ARRAY_NULL_TERMINATED
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if (self->start == NULL)
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{
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self->start = g_new (_T_, new_size);
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*self->start = *(_T_[1]) { 0 };
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}
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else
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#endif
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self->start = g_renew (_T_, self->start, new_size);
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self->end = self->start + size;
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self->end_allocation = self->start + new_size;
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#ifdef GDK_ARRAY_NULL_TERMINATED
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self->end_allocation--;
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#endif
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}
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G_GNUC_UNUSED static inline void
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gdk_array(splice) (GdkArray *self,
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gsize pos,
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gsize removed,
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_T_ *additions,
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gsize added)
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{
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gsize size;
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gsize remaining;
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size = gdk_array(get_size) (self);
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g_assert (pos + removed <= size);
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remaining = size - pos - removed;
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gdk_array(free_elements) (gdk_array(index) (self, pos),
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gdk_array(index) (self, pos + removed));
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gdk_array(reserve) (self, size - removed + added);
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if (GDK_ARRAY_REAL_SIZE (remaining) && removed != added)
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memmove (gdk_array(index) (self, pos + added),
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gdk_array(index) (self, pos + removed),
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GDK_ARRAY_REAL_SIZE (remaining) * sizeof (_T_));
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if (added)
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{
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if (additions)
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memcpy (gdk_array(index) (self, pos),
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additions,
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added * sizeof (_T_));
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#ifndef GDK_ARRAY_NO_MEMSET
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else
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memset (gdk_array(index) (self, pos), 0, added * sizeof (_T_));
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#endif
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}
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/* might overflow, but does the right thing */
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self->end += added - removed;
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}
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G_GNUC_UNUSED static void
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gdk_array(set_size) (GdkArray *self,
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gsize new_size)
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{
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gsize old_size = gdk_array(get_size) (self);
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if (new_size > old_size)
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gdk_array(splice) (self, old_size, 0, NULL, new_size - old_size);
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else
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gdk_array(splice) (self, new_size, old_size - new_size, NULL, 0);
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}
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G_GNUC_UNUSED static void
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gdk_array(append) (GdkArray *self,
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#ifdef GDK_ARRAY_BY_VALUE
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_T_ *value)
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#else
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_T_ value)
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#endif
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{
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gdk_array(splice) (self,
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gdk_array(get_size) (self),
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0,
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#ifdef GDK_ARRAY_BY_VALUE
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value,
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#else
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&value,
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#endif
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1);
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}
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#ifdef GDK_ARRAY_BY_VALUE
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G_GNUC_UNUSED static _T_ *
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gdk_array(get) (const GdkArray *self,
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gsize pos)
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{
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return gdk_array(index) (self, pos);
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}
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#else
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G_GNUC_UNUSED static _T_
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gdk_array(get) (const GdkArray *self,
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gsize pos)
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{
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return *gdk_array(index) (self, pos);
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}
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#endif
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#ifndef GDK_ARRAY_NO_UNDEF
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#undef _T_
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#undef GdkArray
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#undef gdk_array_paste_more
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#undef gdk_array_paste
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#undef gdk_array
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#undef GDK_ARRAY_REAL_SIZE
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#undef GDK_ARRAY_BY_VALUE
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#undef GDK_ARRAY_ELEMENT_TYPE
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#undef GDK_ARRAY_FREE_FUNC
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#undef GDK_ARRAY_NAME
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#undef GDK_ARRAY_NULL_TERMINATED
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#undef GDK_ARRAY_PREALLOC
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#undef GDK_ARRAY_TYPE_NAME
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#undef GDK_ARRAY_NO_MEMSET
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#endif
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