mpv/talloc.h

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>

#include "compat/compiler.h"

#include "ta/ta_talloc.h"
Add the talloc memory allocator Copy talloc.c and talloc.h from Samba (last changed 2008-04-17 in commit 7b9a647ebbbe9ec9e1b82b42e3a8916396f91273). 2008-04-20 01:38:27 +00:00			`#include <stdlib.h>`
			`#include <stdio.h>`
			`#include <stdarg.h>`

mp_common.h: split parts into mp_talloc.h and compiler.h Put MP_EXPAND_ARGS() in compiler.h, even though it's not compiler dependent. Both mp_talloc.h and mp_common.h need it, while mp_common.h includes mp_talloc.h. This is the least annoying solution. 2012-11-10 15:19:53 +00:00			`#include "compat/compiler.h"`
windows: fix format string attributes on MinGW MinGW maps the "printf" format string archetype to the non-standard MSVCRT functions, even if __USE_MINGW_ANSI_STDIO is defined and set to 1. We need to use "gnu_printf" to use the format strings as provided by vsnprintf and similar functions to get correct warnings. Since "gnu_printf" isn't necessarily available on other GCC compatible compilers (such as clang), do this only on MinGW. 2012-01-31 07:32:06 +00:00
Replace talloc There are multiple reasons to do this. One big reason is the license: talloc is LGPLv3+, which forces mpv to be licensed as GPLv3+. Another one is that our talloc copy contains modifications, which makes it essentially incompatible with upstream talloc (in particular, our version aborts on out of memory conditions - well, it wasn't my idea). Updating from upstream is also a bit involved - the talloc source is not really organized in a way to allow copying it into projects (and this isn't an intended use-case). Finally, talloc is kind of big and bloated. The replacement halves the amount of code - mainly because we didn't use all talloc features. It's even more extreme if you compare upstream talloc (~4700 lines) and the new allocator without talloc compat (~900 lines). The replacement provides all features we need. It also doesn't clash with talloc. (The talloc compatibility wrapper uses macros to avoid introducing linker-level symbols which could clash with libtalloc.) It also tries to lower the overhead (only 4 words opposed to 10 words in talloc for leaf nodes in release mode). Debugging features like leak reporting can be enabled at compile time and add somewhat more overhead. Though I'm not sure whether the overhead reduction was actually successful: allocations with children need an "extra" header, which adds plenty of overhead, and it turns out that almost half of all allocations have children. Maybe the implementation could be simplified and the extra header removed - even then, overhead would be lower than talloc's. Currently, debugging features can be entirely deactivated by defining NDEBUG - I'm not sure if anything defines this directly yet, though. Unlike in talloc, the leak reporting stuff is thread-safe. (That's also why it's far less elegant, and requires extra list pointers.) Comes with a compatibility layer, so no changes to mpv source code are needed. The idea is that we will pretend to be using talloc for a while, so that we can revert to our old talloc implementation at any time for debugging purposes. Some inspiration was taken from Mesa's ralloc: http://cgit.freedesktop.org/mesa/mesa/tree/src/glsl/ralloc.h This is another talloc replacement, but lacks some features we need (getting size of an allocation, debugging features, being able to access children in the dtor). There's some information in ta/README what will happen next and how the transition is expected to progress. 2013-10-12 23:17:45 +00:00			`#include "ta/ta_talloc.h"`