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Von: Thomas Zimmermann 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
author Sam Lantinga <slouken@libsdl.org>
date Wed, 03 Jun 2009 04:37:27 +0000
parents 99210400e8b9
children f7b03b6838cb
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 * Default cursor - it happens to be the Mac cursor, but could be anything   */

#define DEFAULT_CWIDTH	16
#define DEFAULT_CHEIGHT	16
#define DEFAULT_CHOTX	0
#define DEFAULT_CHOTY	0

/* Added a real MacOS cursor, at the request of Luc-Olivier de Charrière */
#define USE_MACOS_CURSOR

#ifdef USE_MACOS_CURSOR

static const unsigned char default_cdata[] = {
    0x00, 0x00,
    0x40, 0x00,
    0x60, 0x00,
    0x70, 0x00,
    0x78, 0x00,
    0x7C, 0x00,
    0x7E, 0x00,
    0x7F, 0x00,
    0x7F, 0x80,
    0x7C, 0x00,
    0x6C, 0x00,
    0x46, 0x00,
    0x06, 0x00,
    0x03, 0x00,
    0x03, 0x00,
    0x00, 0x00
};

static const unsigned char default_cmask[] = {
    0xC0, 0x00,
    0xE0, 0x00,
    0xF0, 0x00,
    0xF8, 0x00,
    0xFC, 0x00,
    0xFE, 0x00,
    0xFF, 0x00,
    0xFF, 0x80,
    0xFF, 0xC0,
    0xFF, 0xE0,
    0xFE, 0x00,
    0xEF, 0x00,
    0xCF, 0x00,
    0x87, 0x80,
    0x07, 0x80,
    0x03, 0x00
};

#else

static const unsigned char default_cdata[] = {
    0x00, 0x00,
    0x40, 0x00,
    0x60, 0x00,
    0x70, 0x00,
    0x78, 0x00,
    0x7C, 0x00,
    0x7E, 0x00,
    0x7F, 0x00,
    0x7F, 0x80,
    0x7C, 0x00,
    0x6C, 0x00,
    0x46, 0x00,
    0x06, 0x00,
    0x03, 0x00,
    0x03, 0x00,
    0x00, 0x00
};

static const unsigned char default_cmask[] = {
    0x40, 0x00,
    0xE0, 0x00,
    0xF0, 0x00,
    0xF8, 0x00,
    0xFC, 0x00,
    0xFE, 0x00,
    0xFF, 0x00,
    0xFF, 0x80,
    0xFF, 0xC0,
    0xFF, 0x80,
    0xFE, 0x00,
    0xEF, 0x00,
    0x4F, 0x00,
    0x07, 0x80,
    0x07, 0x80,
    0x03, 0x00
};

#endif /* TRUE_MACINTOSH_CURSOR */
/* vi: set ts=4 sw=4 expandtab: */