Browse Source

libbacktrace: initial commit

This is a standalone version of the libbacktrace library that I
originally wrote for GCC.  This is a copy of libbacktrace from GCC
trunk, with all dependencies incorporated here.
lib
Ian Lance Taylor 5 years ago
parent
commit
84241313f2
  1. 29
      LICENSE
  2. 130
      Makefile.am
  3. 837
      Makefile.in
  4. 28
      README.md
  5. 71
      acinclude.m4
  6. 8660
      aclocal.m4
  7. 156
      alloc.c
  8. 113
      atomic.c
  9. 66
      backtrace-supported.h.in
  10. 129
      backtrace.c
  11. 182
      backtrace.h
  12. 725
      btest.c
  13. 1530
      config.guess
  14. 119
      config.h.in
  15. 1773
      config.sub
  16. 13874
      configure
  17. 408
      configure.ac
  18. 3123
      dwarf.c
  19. 979
      elf.c
  20. 194
      fileline.c
  21. 5
      filetype.awk
  22. 527
      install-sh
  23. 294
      internal.h
  24. 7874
      ltmain.sh
  25. 331
      missing
  26. 303
      mmap.c
  27. 100
      mmapio.c
  28. 66
      nounwind.c
  29. 937
      pecoff.c
  30. 100
      posix.c
  31. 92
      print.c
  32. 96
      read.c
  33. 108
      simple.c
  34. 108
      sort.c
  35. 72
      state.c
  36. 137
      stest.c
  37. 64
      unknown.c

29
LICENSE

@ -0,0 +1,29 @@
# Copyright (C) 2012-2016 Free Software Foundation, Inc.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# (1) Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# (2) Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# (3) The name of the author may not be used to
# endorse or promote products derived from this software without
# specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

130
Makefile.am

@ -0,0 +1,130 @@
# Makefile.am -- Backtrace Makefile.
# Copyright (C) 2012-2016 Free Software Foundation, Inc.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# (1) Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# (2) Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# (3) The name of the author may not be used to
# endorse or promote products derived from this software without
# specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
lib_LTLIBRARIES = libbacktrace.la
include_HEADERS = backtrace.h backtrace-supported.h
libbacktrace_la_SOURCES = \
backtrace.h \
atomic.c \
dwarf.c \
fileline.c \
internal.h \
posix.c \
print.c \
sort.c \
state.c
BACKTRACE_FILES = \
backtrace.c \
simple.c \
nounwind.c
FORMAT_FILES = \
elf.c \
pecoff.c \
unknown.c
VIEW_FILES = \
read.c \
mmapio.c
ALLOC_FILES = \
alloc.c \
mmap.c
EXTRA_libbacktrace_la_SOURCES = \
$(BACKTRACE_FILES) \
$(FORMAT_FILES) \
$(VIEW_FILES) \
$(ALLOC_FILES)
libbacktrace_la_LIBADD = \
$(BACKTRACE_FILE) \
$(FORMAT_FILE) \
$(VIEW_FILE) \
$(ALLOC_FILE)
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check_PROGRAMS += btest
stest_SOURCES = stest.c
stest_LDADD = libbacktrace.la
check_PROGRAMS += stest
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# These manual dependencies do not include dependencies on unwind.h,
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alloc.lo: config.h backtrace.h internal.h
backtrace.lo: config.h backtrace.h internal.h
btest.lo: backtrace.h backtrace-supported.h
dwarf.lo: config.h backtrace.h internal.h
elf.lo: config.h backtrace.h internal.h
fileline.lo: config.h backtrace.h internal.h
mmap.lo: config.h backtrace.h internal.h
mmapio.lo: config.h backtrace.h internal.h
nounwind.lo: config.h internal.h
pecoff.lo: config.h backtrace.h internal.h
posix.lo: config.h backtrace.h internal.h
print.lo: config.h backtrace.h internal.h
read.lo: config.h backtrace.h internal.h
simple.lo: config.h backtrace.h internal.h
sort.lo: config.h backtrace.h internal.h
stest.lo: config.h backtrace.h internal.h
state.lo: config.h backtrace.h backtrace-supported.h internal.h
unknown.lo: config.h backtrace.h internal.h

837
Makefile.in

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# (1) Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# (2) Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# (3) The name of the author may not be used to
# endorse or promote products derived from this software without
# specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# We can't use automake's automatic dependency tracking, because it
# breaks when using bootstrap-lean. Automatic dependency tracking
# with GCC bootstrap will cause some of the objects to depend on
# header files in prev-gcc/include, e.g., stddef.h and stdarg.h. When
# using bootstrap-lean, prev-gcc is removed after each stage. When
# running "make install", those header files will be gone, causing the
# library to be rebuilt at install time. That may not succeed.
# These manual dependencies do not include dependencies on unwind.h,
# even though that is part of GCC, because where to find it depends on
# whether we are being built as a host library or a target library.
alloc.lo: config.h backtrace.h internal.h
backtrace.lo: config.h backtrace.h internal.h
btest.lo: backtrace.h backtrace-supported.h
dwarf.lo: config.h backtrace.h internal.h
elf.lo: config.h backtrace.h internal.h
fileline.lo: config.h backtrace.h internal.h
mmap.lo: config.h backtrace.h internal.h
mmapio.lo: config.h backtrace.h internal.h
nounwind.lo: config.h internal.h
pecoff.lo: config.h backtrace.h internal.h
posix.lo: config.h backtrace.h internal.h
print.lo: config.h backtrace.h internal.h
read.lo: config.h backtrace.h internal.h
simple.lo: config.h backtrace.h internal.h
sort.lo: config.h backtrace.h internal.h
stest.lo: config.h backtrace.h internal.h
state.lo: config.h backtrace.h backtrace-supported.h internal.h
unknown.lo: config.h backtrace.h internal.h
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

28
README.md

@ -1,2 +1,30 @@
# libbacktrace
A C library that may be linked into a C/C++ program to produce symbolic backtraces
Initially written by Ian Lance Taylor <iant@golang.org>
The libbacktrace library may be linked into a program or library and
used to produce symbolic backtraces.
Sample uses would be to print a detailed backtrace when an error
occurs or to gather detailed profiling information.
The libbacktrace library is provided under a BSD license.
See the source files for the exact license text.
The public functions are declared and documented in the header file
backtrace.h, which should be #include'd by a user of the library.
Building libbacktrace will generate a file backtrace-supported.h,
which a user of the library may use to determine whether backtraces
will work.
See the source file backtrace-supported.h.in for the macros that it
defines.
As of September 2016, libbacktrace only supports ELF and PE/COFF
executables with DWARF debugging information.
The library is written to make it straightforward to add support for
other object file and debugging formats.
The library relies on the C++ unwind API defined at
http://mentorembedded.github.io/cxx-abi/abi-eh.html.
This API is provided by GCC.

71
acinclude.m4

@ -0,0 +1,71 @@
dnl
dnl Check whether _Unwind_GetIPInfo is available without doing a link
dnl test so we can use this with libstdc++-v3 and libjava. Need to
dnl use $target to set defaults because automatic checking is not possible
dnl without a link test (and maybe even with a link test).
dnl
AC_DEFUN([GCC_CHECK_UNWIND_GETIPINFO], [
AC_ARG_WITH(system-libunwind,
[ --with-system-libunwind use installed libunwind])
# If system-libunwind was not specifically set, pick a default setting.
if test x$with_system_libunwind = x; then
case ${target} in
ia64-*-hpux*) with_system_libunwind=yes ;;
*) with_system_libunwind=no ;;
esac
fi
# Based on system-libunwind and target, do we have ipinfo?
if test x$with_system_libunwind = xyes; then
case ${target} in
ia64-*-*) have_unwind_getipinfo=no ;;
*) have_unwind_getipinfo=yes ;;
esac
else
# Darwin before version 9 does not have _Unwind_GetIPInfo.
changequote(,)
case ${target} in
*-*-darwin[3-8]|*-*-darwin[3-8].*) have_unwind_getipinfo=no ;;
*) have_unwind_getipinfo=yes ;;
esac
changequote([,])
fi
if test x$have_unwind_getipinfo = xyes; then
AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
fi
])
# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS])
# Sets @VARIABLE@ to the subset of the given options which the
# compiler accepts.
AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_LANG_PUSH(C)
m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
AC_SUBST(acx_Var)dnl
m4_expand_once([acx_Var=
],m4_quote(acx_Var=))dnl
save_CFLAGS="$CFLAGS"
for real_option in $1; do
# Do the check with the no- prefix removed since gcc silently
# accepts any -Wno-* option on purpose
case $real_option in
-Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
*) option=$real_option ;;
esac
AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
AC_CACHE_CHECK([whether $CC supports $option], acx_Woption,
[CFLAGS="$option"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
[AS_VAR_SET(acx_Woption, yes)],
[AS_VAR_SET(acx_Woption, no)])
])
AS_IF([test AS_VAR_GET(acx_Woption) = yes],
[acx_Var="$acx_Var${acx_Var:+ }$real_option"])
AS_VAR_POPDEF([acx_Woption])dnl
done
CFLAGS="$save_CFLAGS"
m4_popdef([acx_Var])dnl
AC_LANG_POP(C)
])# ACX_PROG_CC_WARNING_OPTS

8660
aclocal.m4
File diff suppressed because it is too large
View File

156
alloc.c

@ -0,0 +1,156 @@
/* alloc.c -- Memory allocation without mmap.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#include "config.h"
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include "backtrace.h"
#include "internal.h"
/* Allocation routines to use on systems that do not support anonymous
mmap. This implementation just uses malloc, which means that the
backtrace functions may not be safely invoked from a signal
handler. */
/* Allocate memory like malloc. If ERROR_CALLBACK is NULL, don't
report an error. */
void *
backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
size_t size, backtrace_error_callback error_callback,
void *data)
{
void *ret;
ret = malloc (size);
if (ret == NULL)
{
if (error_callback)
error_callback (data, "malloc", errno);
}
return ret;
}
/* Free memory. */
void
backtrace_free (struct backtrace_state *state ATTRIBUTE_UNUSED,
void *p, size_t size ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
{
free (p);
}
/* Grow VEC by SIZE bytes. */
void *
backtrace_vector_grow (struct backtrace_state *state ATTRIBUTE_UNUSED,
size_t size, backtrace_error_callback error_callback,
void *data, struct backtrace_vector *vec)
{
void *ret;
if (size > vec->alc)
{
size_t alc;
void *base;
if (vec->size == 0)
alc = 32 * size;
else if (vec->size >= 4096)
alc = vec->size + 4096;
else
alc = 2 * vec->size;
if (alc < vec->size + size)
alc = vec->size + size;
base = realloc (vec->base, alc);
if (base == NULL)
{
error_callback (data, "realloc", errno);
return NULL;
}
vec->base = base;
vec->alc = alc - vec->size;
}
ret = (char *) vec->base + vec->size;
vec->size += size;
vec->alc -= size;
return ret;
}
/* Finish the current allocation on VEC. */
void *
backtrace_vector_finish (struct backtrace_state *state,
struct backtrace_vector *vec,
backtrace_error_callback error_callback,
void *data)
{
void *ret;
/* With this allocator we call realloc in backtrace_vector_grow,
which means we can't easily reuse the memory here. So just
release it. */
if (!backtrace_vector_release (state, vec, error_callback, data))
return NULL;
ret = vec->base;
vec->base = NULL;
vec->size = 0;
vec->alc = 0;
return ret;
}
/* Release any extra space allocated for VEC. */
int
backtrace_vector_release (struct backtrace_state *state ATTRIBUTE_UNUSED,
struct backtrace_vector *vec,
backtrace_error_callback error_callback,
void *data)
{
vec->base = realloc (vec->base, vec->size);
if (vec->base == NULL)
{
error_callback (data, "realloc", errno);
return 0;
}
vec->alc = 0;
return 1;
}

113
atomic.c

@ -0,0 +1,113 @@
/* atomic.c -- Support for atomic functions if not present.
Copyright (C) 2013-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#include "config.h"
#include <sys/types.h>
#include "backtrace.h"
#include "backtrace-supported.h"
#include "internal.h"
/* This file holds implementations of the atomic functions that are
used if the host compiler has the sync functions but not the atomic
functions, as is true of versions of GCC before 4.7. */
#if !defined (HAVE_ATOMIC_FUNCTIONS) && defined (HAVE_SYNC_FUNCTIONS)
/* Do an atomic load of a pointer. */
void *
backtrace_atomic_load_pointer (void *arg)
{
void **pp;
void *p;
pp = (void **) arg;
p = *pp;
while (!__sync_bool_compare_and_swap (pp, p, p))
p = *pp;
return p;
}
/* Do an atomic load of an int. */
int
backtrace_atomic_load_int (int *p)
{
int i;
i = *p;
while (!__sync_bool_compare_and_swap (p, i, i))
i = *p;
return i;
}
/* Do an atomic store of a pointer. */
void
backtrace_atomic_store_pointer (void *arg, void *p)
{
void **pp;
void *old;
pp = (void **) arg;
old = *pp;
while (!__sync_bool_compare_and_swap (pp, old, p))
old = *pp;
}
/* Do an atomic store of a size_t value. */
void
backtrace_atomic_store_size_t (size_t *p, size_t v)
{
size_t old;
old = *p;
while (!__sync_bool_compare_and_swap (p, old, v))
old = *p;
}
/* Do an atomic store of a int value. */
void
backtrace_atomic_store_int (int *p, int v)
{
size_t old;
old = *p;
while (!__sync_bool_compare_and_swap (p, old, v))
old = *p;
}
#endif

66
backtrace-supported.h.in

@ -0,0 +1,66 @@
/* backtrace-supported.h.in -- Whether stack backtrace is supported.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
/* The file backtrace-supported.h.in is used by configure to generate
the file backtrace-supported.h. The file backtrace-supported.h may
be #include'd to see whether the backtrace library will be able to
get a backtrace and produce symbolic information. */
/* BACKTRACE_SUPPORTED will be #define'd as 1 if the backtrace library
should work, 0 if it will not. Libraries may #include this to make
other arrangements. */
#define BACKTRACE_SUPPORTED @BACKTRACE_SUPPORTED@
/* BACKTRACE_USES_MALLOC will be #define'd as 1 if the backtrace
library will call malloc as it works, 0 if it will call mmap
instead. This may be used to determine whether it is safe to call
the backtrace functions from a signal handler. In general this
only applies to calls like backtrace and backtrace_pcinfo. It does
not apply to backtrace_simple, which never calls malloc. It does
not apply to backtrace_print, which always calls fprintf and
therefore malloc. */
#define BACKTRACE_USES_MALLOC @BACKTRACE_USES_MALLOC@
/* BACKTRACE_SUPPORTS_THREADS will be #define'd as 1 if the backtrace
library is configured with threading support, 0 if not. If this is
0, the threaded parameter to backtrace_create_state must be passed
as 0. */
#define BACKTRACE_SUPPORTS_THREADS @BACKTRACE_SUPPORTS_THREADS@
/* BACKTRACE_SUPPORTS_DATA will be #defined'd as 1 if the backtrace_syminfo
will work for variables. It will always work for functions. */
#define BACKTRACE_SUPPORTS_DATA @BACKTRACE_SUPPORTS_DATA@

129
backtrace.c

@ -0,0 +1,129 @@
/* backtrace.c -- Entry point for stack backtrace library.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#include "config.h"
#include <sys/types.h>
#include "unwind.h"
#include "backtrace.h"
#include "internal.h"
/* The main backtrace_full routine. */
/* Data passed through _Unwind_Backtrace. */
struct backtrace_data
{
/* Number of frames to skip. */
int skip;
/* Library state. */
struct backtrace_state *state;
/* Callback routine. */
backtrace_full_callback callback;
/* Error callback routine. */
backtrace_error_callback error_callback;
/* Data to pass to callback routines. */
void *data;
/* Value to return from backtrace_full. */
int ret;
/* Whether there is any memory available. */
int can_alloc;
};
/* Unwind library callback routine. This is passed to
_Unwind_Backtrace. */
static _Unwind_Reason_Code
unwind (struct _Unwind_Context *context, void *vdata)
{
struct backtrace_data *bdata = (struct backtrace_data *) vdata;
uintptr_t pc;
int ip_before_insn = 0;
#ifdef HAVE_GETIPINFO
pc = _Unwind_GetIPInfo (context, &ip_before_insn);
#else
pc = _Unwind_GetIP (context);
#endif
if (bdata->skip > 0)
{
--bdata->skip;
return _URC_NO_REASON;
}
if (!ip_before_insn)
--pc;
if (!bdata->can_alloc)
bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
else
bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
bdata->error_callback, bdata->data);
if (bdata->ret != 0)
return _URC_END_OF_STACK;
return _URC_NO_REASON;
}
/* Get a stack backtrace. */
int
backtrace_full (struct backtrace_state *state, int skip,
backtrace_full_callback callback,
backtrace_error_callback error_callback, void *data)
{
struct backtrace_data bdata;
void *p;
bdata.skip = skip + 1;
bdata.state = state;
bdata.callback = callback;
bdata.error_callback = error_callback;
bdata.data = data;
bdata.ret = 0;
/* If we can't allocate any memory at all, don't try to produce
file/line information. */
p = backtrace_alloc (state, 4096, NULL, NULL);
if (p == NULL)
bdata.can_alloc = 0;
else
{
backtrace_free (state, p, 4096, NULL, NULL);
bdata.can_alloc = 1;
}
_Unwind_Backtrace (unwind, &bdata);
return bdata.ret;
}

182
backtrace.h

@ -0,0 +1,182 @@
/* backtrace.h -- Public header file for stack backtrace library.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Google.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
(1) Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
(2) Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
(3) The name of the author may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
#ifndef BACKTRACE_H
#define BACKTRACE_H
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
/* The backtrace state. This struct is intentionally not defined in
the public interface. */
struct backtrace_state;
/* The type of the error callback argument to backtrace functions.
This function, if not NULL, will be called for certain error cases.
The DATA argument is passed to the function that calls this one.
The MSG argument is an error message. The ERRNUM argument, if
greater than 0, holds an errno value. The MSG buffer may become
invalid after this function returns.
As a special case, the ERRNUM argument will be passed as -1 if no
debug info can be found for the executable, but the function
requires debug info (e.g., backtrace_full, backtrace_pcinfo). The
MSG in this case will be something along the lines of "no debug
info". Similarly, ERRNUM will be passed as -1 if there is no
symbol table, but the function requires a symbol table (e.g.,
backtrace_syminfo). This may be used as a signal that some other
approach should be tried. */
typedef void (*backtrace_error_callback) (void *data, const char *msg,
int errnum);
/* Create state information for the backtrace routines. This must be