test/text-cache-crash.c

   1 /*
   2  * Copyright © 2004 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software
   5  * and its documentation for any purpose is hereby granted without
   6  * fee, provided that the above copyright notice appear in all copies
   7  * and that both that copyright notice and this permission notice
   8  * appear in supporting documentation, and that the name of
   9  * Red Hat, Inc. not be used in advertising or publicity pertaining to
  10  * distribution of the software without specific, written prior
  11  * permission. Red Hat, Inc. makes no representations about the
  12  * suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
  18  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  20  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
  21  * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  *
  23  * Author: Carl D. Worth <cworth@cworth.org>
  24  */
  25
  26 /* Bug history
  27  *
  28  * 2004-11-04 Ned Konz <ned@squeakland.org>
  29  *
  30  *   Reported bug on mailing list:
  31  *
  32  *      From: Ned Konz <ned@squeakland.org>
  33  *      To: cairo@cairographics.org
  34  *      Date: Thu, 4 Nov 2004 09:49:38 -0800
  35  *      Subject: [cairo] getting assertions [cairo_cache.c:143: _entry_destroy:
  36  *              Assertion `cache->used_memory > entry->memory' failed]
  37  *
  38  *      The attached program dies on me with the assert
  39  *
  40  *      $ ./testCairo
  41  *      testCairo: cairo_cache.c:143: _entry_destroy: Assertion `cache->used_memory > entry->memory' failed.
  42  *
  43  * 2004-11-04 Carl Worth <cworth@cworth.org>
  44  *
  45  *   I trimmed down Ned's example to the folllowing test while still
  46  *   maintaining the assertion.
  47  *
  48  *   Oh, actually, it looks like I may have triggered something
  49  *   slightly different:
  50  *
  51  *      text_cache_crash: cairo_cache.c:422: _cairo_cache_lookup: Assertion `cache->max_memory >= (cache->used_memory + new_entry->memory)' failed.
  52  *
  53  *   I'll have to go back and try the original test after I fix this.
  54  *
  55  * 2004-11-13 Carl Worth <cworth@cworth.org>
  56  *
  57  *   Found the bug. cairo_gstate_select_font was noticing when the
  58  *   same font was selected twice in a row and was erroneously failing
  59  *   to free the old reference. Committed a fix and verified it also
  60  *   fixed the orginal test case.
  61  */
  62
  63 #include "cairo-test.h"
  64
  65 static cairo_test_draw_function_t draw;
  66
  67 cairo_test_t test = {
  68     "text-cache-crash",
  69     "Test case for bug causing an assertion failure in _cairo_cache_lookup",
  70     0, 0,
  71     draw
  72 };
  73 #include <cairo.h>
  74
  75 static cairo_test_status_t
  76 draw (cairo_t *cr, int width, int height)
  77 {
  78     /* Once there was a bug that choked when selecting the same font twice. */
  79     cairo_select_font_face (cr, "sans",
  80                             CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
  81     cairo_set_font_size (cr, 40.0);
  82
  83     cairo_select_font_face (cr, "sans",
  84                             CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
  85     cairo_set_font_size (cr, 40.0);
  86     cairo_move_to (cr, 10, 50);
  87     cairo_show_text (cr, "hello");
  88
  89     /* Then there was a bug that choked when selecting a font too big
  90      * for the cache. */
  91
  92 /* XXX: Sometimes this leads to an assertion:
  93
  94 _cairo_cache_lookup: Assertion `cache->max_memory >= (cache->used_memory + new_entry->memory)' failed.
  95 Aborted
  96
  97    But other times my machine hangs completely only to return to life
  98    several minutes later with some programs missing. This seems like
  99    the out-of-memory killer to me.
 100
 101    It seems like I usually get the assertion when I run
 102    ./text_cache_crash directly and I usually get the machine hang when
 103    I run "make check" but I don't know if there's a perfect
 104    correlation there.
 105
 106    So there's a bad bug here somewhere that really needs to be fixed.
 107    But in the meantime, I need "make check" not to destory work, so
 108    I'm commenting this test out for now.
 109
 110     cairo_set_font_size (cr, 500);
 111     cairo_show_text (cr, "hello");
 112 */
 113
 114     return CAIRO_TEST_SUCCESS;
 115 }
 116
 117 int
 118 main (void)
 119 {
 120     return cairo_test (&test);
 121 }