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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 | 4a28c7c985b2 |
| children | 7a9740b1c1a8 |
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1.3 release checklist: * Create jobs@libsdl.org * Implement landscape mode for iPhone port * Add higher precision timers for profiling * Implement YUV texture support - in progress, software support is done, Ryan is working on OpenGL shaders * Implement desktop video mode change notification? * Add OpenGL 3.0 context support * Finish multiple display support * Open windows on display that is selected when creating a window * Create testing plan - becoming more and more important... - unit tests for each feature and combination with expected output and actual output comparison. * Public license for SDL_compat.c, tests, and SDL_main* * Verify mouse grab support * Properly handle mouse grab with Vista DPI scaling * Make sure the mouse is where it's supposed to be when un-grabbed * Plan how to handle events on foreign windows * Add keyboard enumeration / name query API * Implement NET_WM_PING and NET_WM_PID/WM_CLIENT_MACHINE (?) - http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#KILLINGWINDOWS * Add a timeout parameter for SDL_WaitEvent() (?) - http://lists.libsdl.org/pipermail/sdl-libsdl.org/2008-May/thread.html#65067 * Implement key repeat at the driver level * Add name -> keysym and name -> scancode lookup functions * Fix building haptic system on win32 * Add always on top window styles * Add video modes that have an alpha channel? * Implement SDL_RenderReadPixels() for screenshots? Wish list for the 1.3 development branch: http://bugzilla.libsdl.org/ * Add a way to register custom events * DirectInput joystick support needs to be implemented * Explicit vertical retrace wait (maybe separate from SDL_Flip?) * Shaped windows, windows without borders * Multiple display support * Add a timestamp to events * Add audio input API * Add modifier state to key and button events In the jump from 1.2 to 1.3, we should change the SDL_Rect members to int and evaluate all the rest of the datatypes. This is the only place we should do it though, since the 1.2 series should not break binary compatibility in this way. Requests: * PCM and CDROM volume control (deprecated, but possible)