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Betreff: [SDL] [PATCH] Make static variables const
Datum: Tue, 19 May 2009 19:45:37 +0200
Hi,
this is a set of simple changes which make some of SDL's internal static
arrays constant. The purpose is to shrink the number of write-able
static bytes and thus increase the number of memory pages shared between
SDL applications.
The patch set is against trunk@4513. Each of the attached patch files is
specific to a sub-system. The set is completed by a second mail, because
of the list's 40 KiB limit.
The files readelf-r4513.txt and readelf-const-patch.txt where made by
calling 'readelf -S libSDL.so'. They show the difference in ELF sections
without and with the patch. Some numbers measured on my x86-64:
Before
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000008170 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 00000000003045e0 001045e0
00000000000023d0 0000000000000000 WA 0 0 32
[23] .data PROGBITS 00000000003076e0 001076e0
0000000000004988 0000000000000000 WA 0 0 32
After
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000009a50 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 0000000000306040 00106040
0000000000002608 0000000000000000 WA 0 0 32
[23] .data PROGBITS 0000000000309360 00109360
0000000000002e88 0000000000000000 WA 0 0 32
The size of the write-able data section decreased considerably. Some
entries became const-after-relocation, while most of its content went
straight into the read-only data section.
Best regards, Thomas
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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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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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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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Default cursor - it happens to be the Mac cursor, but could be anything */
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#define DEFAULT_CWIDTH 16
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#define DEFAULT_CHEIGHT 16
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#define DEFAULT_CHOTX 0
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#define DEFAULT_CHOTY 0
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/* Added a real MacOS cursor, at the request of Luc-Olivier de Charrière */
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#define USE_MACOS_CURSOR
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#ifdef USE_MACOS_CURSOR
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static const unsigned char default_cdata[] = {
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0x00, 0x00,
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0x40, 0x00,
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0x60, 0x00,
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0x70, 0x00,
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0x78, 0x00,
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0x7C, 0x00,
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0x7E, 0x00,
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0x7F, 0x00,
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0x7F, 0x80,
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0x7C, 0x00,
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0x6C, 0x00,
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0x46, 0x00,
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0x06, 0x00,
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0x03, 0x00,
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0x03, 0x00,
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0x00, 0x00
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};
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static const unsigned char default_cmask[] = {
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0xC0, 0x00,
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0xE0, 0x00,
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0xF0, 0x00,
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0xF8, 0x00,
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0xFC, 0x00,
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0xFE, 0x00,
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0xFF, 0x00,
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0xFF, 0x80,
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0xFF, 0xC0,
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0xFF, 0xE0,
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0xFE, 0x00,
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0xEF, 0x00,
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0xCF, 0x00,
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0x87, 0x80,
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0x07, 0x80,
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0x03, 0x00
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};
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#else
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static const unsigned char default_cdata[] = {
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0x00, 0x00,
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0x40, 0x00,
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0x60, 0x00,
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0x70, 0x00,
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0x78, 0x00,
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0x7C, 0x00,
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0x7E, 0x00,
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0x7F, 0x00,
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0x7F, 0x80,
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0x7C, 0x00,
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0x6C, 0x00,
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0x46, 0x00,
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0x06, 0x00,
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0x03, 0x00,
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0x03, 0x00,
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0x00, 0x00
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};
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static const unsigned char default_cmask[] = {
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0x40, 0x00,
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0xE0, 0x00,
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0xF0, 0x00,
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0xF8, 0x00,
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0xFC, 0x00,
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0xFE, 0x00,
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0xFF, 0x00,
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0xFF, 0x80,
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0xFF, 0xC0,
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0xFF, 0x80,
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0xFE, 0x00,
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0xEF, 0x00,
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0x4F, 0x00,
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0x07, 0x80,
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0x07, 0x80,
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0x03, 0x00
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};
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#endif /* TRUE_MACINTOSH_CURSOR */
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/* vi: set ts=4 sw=4 expandtab: */
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