Mercurial > sdl-ios-xcode
view include/SDL_config_macosx.h @ 3162:dc1eb82ffdaa
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 | fb256fee28d8 |
| children | b7a48f533966 |
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/* 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 */ #ifndef _SDL_config_macosx_h #define _SDL_config_macosx_h #include "SDL_platform.h" /* This gets us MAC_OS_X_VERSION_MIN_REQUIRED... */ #include <AvailabilityMacros.h> /* This is a set of defines to configure the SDL features */ #define SDL_HAS_64BIT_TYPE 1 /* Useful headers */ /* If we specified an SDK or have a post-PowerPC chip, then alloca.h exists. */ #if ( (MAC_OS_X_VERSION_MIN_REQUIRED >= 1030) || (!defined(__POWERPC__)) ) #define HAVE_ALLOCA_H 1 #endif #define HAVE_SYS_TYPES_H 1 #define HAVE_STDIO_H 1 #define STDC_HEADERS 1 #define HAVE_STRING_H 1 #define HAVE_INTTYPES_H 1 #define HAVE_STDINT_H 1 #define HAVE_CTYPE_H 1 #define HAVE_MATH_H 1 #define HAVE_SIGNAL_H 1 /* C library functions */ #define HAVE_MALLOC 1 #define HAVE_CALLOC 1 #define HAVE_REALLOC 1 #define HAVE_FREE 1 #define HAVE_ALLOCA 1 #define HAVE_GETENV 1 #define HAVE_PUTENV 1 #define HAVE_UNSETENV 1 #define HAVE_QSORT 1 #define HAVE_ABS 1 #define HAVE_BCOPY 1 #define HAVE_MEMSET 1 #define HAVE_MEMCPY 1 #define HAVE_MEMMOVE 1 #define HAVE_MEMCMP 1 #define HAVE_STRLEN 1 #define HAVE_STRLCPY 1 #define HAVE_STRLCAT 1 #define HAVE_STRDUP 1 #define HAVE_STRCHR 1 #define HAVE_STRRCHR 1 #define HAVE_STRSTR 1 #define HAVE_STRTOL 1 #define HAVE_STRTOUL 1 #define HAVE_STRTOLL 1 #define HAVE_STRTOULL 1 #define HAVE_STRTOD 1 #define HAVE_ATOI 1 #define HAVE_ATOF 1 #define HAVE_STRCMP 1 #define HAVE_STRNCMP 1 #define HAVE_STRCASECMP 1 #define HAVE_STRNCASECMP 1 #define HAVE_SSCANF 1 #define HAVE_SNPRINTF 1 #define HAVE_VSNPRINTF 1 #define HAVE_CEIL 1 #define HAVE_COPYSIGN 1 #define HAVE_COS 1 #define HAVE_COSF 1 #define HAVE_FABS 1 #define HAVE_FLOOR 1 #define HAVE_LOG 1 #define HAVE_POW 1 #define HAVE_SCALBN 1 #define HAVE_SIN 1 #define HAVE_SINF 1 #define HAVE_SQRT 1 #define HAVE_SIGACTION 1 #define HAVE_SETJMP 1 #define HAVE_NANOSLEEP 1 /* Enable various audio drivers */ #define SDL_AUDIO_DRIVER_COREAUDIO 1 #define SDL_AUDIO_DRIVER_SNDMGR 1 #define SDL_AUDIO_DRIVER_DISK 1 #define SDL_AUDIO_DRIVER_DUMMY 1 /* Enable various cdrom drivers */ #define SDL_CDROM_MACOSX 1 /* Enable various input drivers */ #define SDL_JOYSTICK_IOKIT 1 #define SDL_HAPTIC_IOKIT 1 /* Enable various shared object loading systems */ #ifdef __ppc__ /* For Mac OS X 10.2 compatibility */ #define SDL_LOADSO_DLCOMPAT 1 #else #define SDL_LOADSO_DLOPEN 1 #endif /* Enable various threading systems */ #define SDL_THREAD_PTHREAD 1 #define SDL_THREAD_PTHREAD_RECURSIVE_MUTEX 1 /* Enable various timer systems */ #define SDL_TIMER_UNIX 1 /* Enable various video drivers */ #define SDL_VIDEO_DRIVER_COCOA 1 #define SDL_VIDEO_DRIVER_DUMMY 1 /* Enable OpenGL support */ #define SDL_VIDEO_OPENGL 1 #define SDL_VIDEO_OPENGL_CGL 1 #define SDL_VIDEO_RENDER_OGL 1 /* Enable assembly routines */ #define SDL_ASSEMBLY_ROUTINES 1 #ifdef __ppc__ #define SDL_ALTIVEC_BLITTERS 1 #endif #endif /* _SDL_config_macosx_h */