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view src/video/uikit/SDL_uikitappdelegate.m @ 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 | 99210400e8b9 |
children | 4ec48602f1db |
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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 */ #import "SDL_uikitappdelegate.h" #import "SDL_uikitopenglview.h" #import "SDL_events_c.h" #import "jumphack.h" #ifdef main #undef main #endif extern int SDL_main(int argc, char *argv[]); static int forward_argc; static char **forward_argv; int main(int argc, char **argv) { int i; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; /* store arguments */ forward_argc = argc; forward_argv = (char **)malloc(argc * sizeof(char *)); for (i=0; i<argc; i++) { forward_argv[i] = malloc( (strlen(argv[i])+1) * sizeof(char)); strcpy(forward_argv[i], argv[i]); } /* Give over control to run loop, SDLUIKitDelegate will handle most things from here */ UIApplicationMain(argc, argv, NULL, @"SDLUIKitDelegate"); [pool release]; } @implementation SDLUIKitDelegate @synthesize window; /* convenience method */ +(SDLUIKitDelegate *)sharedAppDelegate { /* the delegate is set in UIApplicationMain(), which is garaunteed to be called before this method */ return (SDLUIKitDelegate *)[[UIApplication sharedApplication] delegate]; } - (id)init { self = [super init]; window = nil; return self; } - (void)applicationDidFinishLaunching:(UIApplication *)application { /* Set working directory to resource path */ [[NSFileManager defaultManager] changeCurrentDirectoryPath: [[NSBundle mainBundle] resourcePath]]; /* run the user's application, passing argc and argv */ int exit_status = SDL_main(forward_argc, forward_argv); /* free the memory we used to hold copies of argc and argv */ int i; for (i=0; i<forward_argc; i++) { free(forward_argv[i]); } free(forward_argv); /* exit, passing the return status from the user's application */ exit(exit_status); } - (void)applicationWillTerminate:(UIApplication *)application { SDL_SendQuit(); /* hack to prevent automatic termination. See SDL_uikitevents.m for details */ longjmp(*(jump_env()), 1); } -(void)dealloc { [window release]; [super dealloc]; } @end