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.

1 files changed, 1 insertions, 175 deletions

diff --git a/talloc.h b/talloc.h
index 60dda32811..1eeef8dca1 100644
--- a/talloc.h
+++ b/talloc.h
@@ -1,181 +1,7 @@
-#ifndef _TALLOC_H_
-#define _TALLOC_H_
-/* 
-   Unix SMB/CIFS implementation.
-   Samba temporary memory allocation functions
-
-   Copyright (C) Andrew Tridgell 2004-2005
-   Copyright (C) Stefan Metzmacher 2006
-   
-     ** NOTE! The following LGPL license applies to the talloc
-     ** library. This does NOT imply that all of Samba is released
-     ** under the LGPL
-   
-   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 3 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, see <http://www.gnu.org/licenses/>.
-*/
-
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
 
 #include "compat/compiler.h"
 
-/* HACK: libsmbclient uses dynamically linked libtalloc.so which has
- * identically named symbols. This name collision caused a crash under
- * stream_smb when trying to play anything with smb://. This hack
- * prevents the symbols declared here from being visible to outside
- * shared libraries and fixes the crash.
- */
-#pragma GCC visibility push(hidden)
-
-/* this is only needed for compatibility with the old talloc */
-typedef void TALLOC_CTX;
-
-/*
-  this uses a little trick to allow __LINE__ to be stringified
-*/
-#ifndef __location__
-#define __TALLOC_STRING_LINE1__(s)    #s
-#define __TALLOC_STRING_LINE2__(s)   __TALLOC_STRING_LINE1__(s)
-#define __TALLOC_STRING_LINE3__  __TALLOC_STRING_LINE2__(__LINE__)
-#define __location__ __FILE__ ":" __TALLOC_STRING_LINE3__
-#endif
-
-#ifndef TALLOC_DEPRECATED
-#define TALLOC_DEPRECATED 0
-#endif
-
-/* try to make talloc_set_destructor() and talloc_steal() type safe,
-   if we have a recent gcc */
-#if defined(__clang__) && defined(__llvm__)
-#define _TALLOC_TYPEOF(ptr) void *
-#define talloc_steal(ctx, ptr) _talloc_steal((ctx),(ptr))
-#elif (__GNUC__ >= 3)
-#define _TALLOC_TYPEOF(ptr) __typeof__(ptr)
-/* this extremely strange macro is to avoid some braindamaged warning
-   stupidity in gcc 4.1.x */
-#define talloc_steal(ctx, ptr) ({ _TALLOC_TYPEOF(ptr) __talloc_steal_ret = (_TALLOC_TYPEOF(ptr))_talloc_steal((ctx),(ptr)); __talloc_steal_ret; })
-#else
-#define _TALLOC_TYPEOF(ptr) void *
-#define talloc_steal(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_steal((ctx),(ptr))
-#endif
-#define talloc_set_destructor(ptr, function) \
-	_talloc_set_destructor((ptr), (function))
-
-#define talloc_reference(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_reference((ctx),(ptr))
-#define talloc_move(ctx, ptr) (_TALLOC_TYPEOF(*(ptr)))_talloc_move((ctx),(void *)(ptr))
-
-/* useful macros for creating type checked pointers */
-#define talloc(ctx, type) (type *)talloc_named_const(ctx, sizeof(type), #type)
-#define talloc_size(ctx, size) talloc_named_const(ctx, size, __location__)
-#define talloc_ptrtype(ctx, ptr) (_TALLOC_TYPEOF(ptr))talloc_size(ctx, sizeof(*(ptr)))
-
-#define talloc_new(ctx) talloc_named_const(ctx, 0, "talloc_new: " __location__)
-
-#define talloc_zero(ctx, type) (type *)_talloc_zero(ctx, sizeof(type), #type)
-#define talloc_zero_size(ctx, size) _talloc_zero(ctx, size, __location__)
-
-#define talloc_zero_array(ctx, type, count) (type *)_talloc_zero_array(ctx, sizeof(type), count, #type)
-#define talloc_array(ctx, type, count) (type *)_talloc_array(ctx, sizeof(type), count, #type)
-#define talloc_array_size(ctx, size, count) _talloc_array(ctx, size, count, __location__)
-#define talloc_array_ptrtype(ctx, ptr, count) (_TALLOC_TYPEOF(ptr))talloc_array_size(ctx, sizeof(*(ptr)), count)
-
-#define talloc_realloc(ctx, p, type, count) (type *)_talloc_realloc_array(ctx, p, sizeof(type), count, #type)
-#define talloc_realloc_size(ctx, ptr, size) _talloc_realloc(ctx, ptr, size, __location__)
-
-#define talloc_memdup(t, p, size) _talloc_memdup(t, p, size, __location__)
-
-#define talloc_set_type(ptr, type) talloc_set_name_const(ptr, #type)
-#define talloc_get_type(ptr, type) (type *)talloc_check_name(ptr, #type)
-
-#define talloc_find_parent_bytype(ptr, type) (type *)talloc_find_parent_byname(ptr, #type)
-
-#if TALLOC_DEPRECATED
-#define talloc_zero_p(ctx, type) talloc_zero(ctx, type)
-#define talloc_p(ctx, type) talloc(ctx, type)
-#define talloc_array_p(ctx, type, count) talloc_array(ctx, type, count)
-#define talloc_realloc_p(ctx, p, type, count) talloc_realloc(ctx, p, type, count)
-#define talloc_destroy(ctx) talloc_free(ctx)
-#define talloc_append_string(c, s, a) (s?talloc_strdup_append(s,a):talloc_strdup(c, a))
-#endif
-
-/* The following definitions come from talloc.c  */
-void *_talloc(const void *context, size_t size);
-void *talloc_pool(const void *context, size_t size);
-void _talloc_set_destructor(const void *ptr, void (*destructor)(void *));
-int talloc_increase_ref_count(const void *ptr);
-size_t talloc_reference_count(const void *ptr);
-void *_talloc_reference(const void *context, const void *ptr);
-int talloc_unlink(const void *context, void *ptr);
-const char *talloc_set_name(const void *ptr, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
-void talloc_set_name_const(const void *ptr, const char *name);
-void *talloc_named(const void *context, size_t size, 
-		   const char *fmt, ...) PRINTF_ATTRIBUTE(3,4);
-void *talloc_named_const(const void *context, size_t size, const char *name);
-const char *talloc_get_name(const void *ptr);
-void *talloc_check_name(const void *ptr, const char *name);
-void *talloc_parent(const void *ptr);
-const char *talloc_parent_name(const void *ptr);
-void *talloc_init(const char *fmt, ...) PRINTF_ATTRIBUTE(1,2);
-int talloc_free(void *ptr);
-void talloc_free_children(void *ptr);
-void *_talloc_realloc(const void *context, void *ptr, size_t size, const char *name);
-void *_talloc_steal(const void *new_ctx, const void *ptr);
-void *_talloc_move(const void *new_ctx, const void *pptr);
-size_t talloc_total_size(const void *ptr);
-size_t talloc_total_blocks(const void *ptr);
-void talloc_report_depth_cb(const void *ptr, int depth, int max_depth,
-			    void (*callback)(const void *ptr,
-			  		     int depth, int max_depth,
-					     int is_ref,
-					     void *private_data),
-			    void *private_data);
-void talloc_report_depth_file(const void *ptr, int depth, int max_depth, FILE *f);
-void talloc_report_full(const void *ptr, FILE *f);
-void talloc_report(const void *ptr, FILE *f);
-void talloc_enable_null_tracking(void);
-void talloc_disable_null_tracking(void);
-void talloc_enable_leak_report(void);
-void talloc_enable_leak_report_full(void);
-void *_talloc_zero(const void *ctx, size_t size, const char *name);
-void *_talloc_memdup(const void *t, const void *p, size_t size, const char *name);
-void *_talloc_array(const void *ctx, size_t el_size, unsigned count, const char *name);
-void *_talloc_zero_array(const void *ctx, size_t el_size, unsigned count, const char *name);
-void *_talloc_realloc_array(const void *ctx, void *ptr, size_t el_size, unsigned count, const char *name);
-void *talloc_realloc_fn(const void *context, void *ptr, size_t size);
-void *talloc_autofree_context(void);
-size_t talloc_get_size(const void *ctx);
-void *talloc_find_parent_byname(const void *ctx, const char *name);
-void talloc_show_parents(const void *context, FILE *file);
-int talloc_is_parent(const void *context, const void *ptr);
-
-char *talloc_strdup(const void *t, const char *p);
-char *talloc_strdup_append(char *s, const char *a);
-char *talloc_strdup_append_buffer(char *s, const char *a);
-
-char *talloc_strndup(const void *t, const char *p, size_t n);
-char *talloc_strndup_append(char *s, const char *a, size_t n);
-char *talloc_strndup_append_buffer(char *s, const char *a, size_t n);
-
-char *talloc_vasprintf(const void *t, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
-char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
-char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap) PRINTF_ATTRIBUTE(2,0);
-
-char *talloc_asprintf(const void *t, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
-char *talloc_asprintf_append(char *s, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
-char *talloc_asprintf_append_buffer(char *s, const char *fmt, ...) PRINTF_ATTRIBUTE(2,3);
-
-// end of visibility hack from above
-#pragma GCC visibility pop
-#endif
+#include "ta/ta_talloc.h"