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build: remove optional support for libunwind

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backtrace() was only ever used for bringup, not actually meant to be used
in any production capacity.
This commit is contained in:
Christian Hergert
2023-08-11 12:22:46 -07:00
parent 912f8e8852
commit 4ad44609d0
5 changed files with 10 additions and 46 deletions
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33
src/preload/backtrace-helper.h
View File

@ -20,23 +20,16 @@
#pragma once
#ifdef HAVE_EXECINFO_H
# include <execinfo.h>
#endif
#ifdef ENABLE_LIBUNWIND
# define UNW_LOCAL_ONLY
# include <libunwind.h>
#endif
#define UNW_LOCAL_ONLY
#include <libunwind.h>
static void
backtrace_init (void)
{
#ifdef ENABLE_LIBUNWIND
unw_set_caching_policy (unw_local_addr_space, UNW_CACHE_PER_THREAD);
# ifdef HAVE_UNW_SET_CACHE_SIZE
#ifdef HAVE_UNW_SET_CACHE_SIZE
unw_set_cache_size (unw_local_addr_space, 1024, 0);
#endif
#endif
}
static int
@ -44,36 +37,20 @@ backtrace_func (SysprofCaptureAddress *addrs,
guint n_addrs,
G_GNUC_UNUSED gpointer user_data)
{
#if defined(ENABLE_LIBUNWIND)
# if GLIB_SIZEOF_VOID_P == 8
#if GLIB_SIZEOF_VOID_P == 8
/* We know that collector will overwrite fields *AFTER* it
* has called the backtrace function allowing us to cheat
* and subtract an offset from addrs to avoid having to
* copy frame pointers around.
*/
return unw_backtrace ((void **)addrs - 2, n_addrs) - 2;
# else
#else
static const int skip = 2;
void **stack = alloca (n_addrs * sizeof (gpointer));
int n = unw_backtrace (stack, n_addrs);
for (guint i = skip; i < n; i++)
addrs[i-skip] = GPOINTER_TO_SIZE (stack[i]);
return MAX (0, n - skip);
# endif
#elif defined(HAVE_EXECINFO_H)
# if GLIB_SIZEOF_VOID_P == 8
/* See note on unw_backtrace() */
return backtrace ((void **)addrs - 2, n_addrs) - 2;
# else /* GLIB_SIZEOF_VOID_P != 8 */
static const int skip = 2;
void **stack = alloca (n_addrs * sizeof (gpointer));
int n = backtrace (stack, n_addrs);
for (guint i = skip; i < n; i++)
addrs[i-skip] = GPOINTER_TO_SIZE (stack[i]);
return MAX (0, n - skip);
# endif /* GLIB_SIZEOF_VOID_P */
#else
return 0;
#endif
}

6
src/preload/meson.build
View File

@ -3,14 +3,10 @@ libdl_dep = dependency('dl', required: false)
preload_deps = [
dependency('glib-2.0'),
libsysprof_capture_dep,
libunwind_dep,
libdl_dep,
]
if get_option('libunwind')
preload_deps += [libunwind_dep]
endif
libsysprof_memory_preload = shared_library('sysprof-memory-@0@'.format(libsysprof_api_version),
['sysprof-memory-collector.c'],
dependencies: preload_deps,