Auto merge of #30908 - petrochenkov:backtrace, r=alexcrichton

@dhuseby @semarie Please, confirm that all Rust-specific changes in the second commit are still required.
(It would be ideal to have an unpatched copy of libbacktrace straight from the gcc repo.)

Fixes #28447

r? @alexcrichton

src/libbacktrace/ChangeLog

@@ -1,3 +1,70 @@
+2016-01-04  Jakub Jelinek  <jakub@redhat.com>
+
+	Update copyright years.
+
+2015-12-18  Andris Pavenis  <andris.pavenis@iki.fi>
+
+	* configure.ac: Specify that DJGPP do not have mmap even when sys/mman.h exists
+	* configure: Regenerate
+
+2015-12-09  John David Anglin  <danglin@gcc.gnu.org>
+
+	PR 68115/libfortran
+	* configure.ac: Set libbacktrace_cv_sys_sync to no on hppa*-*-hpux*.
+	* configure: Regenerate.
+	* elf.c (backtrace_initialize): Cast __sync_bool_compare_and_swap call
+	to void.
+
+2015-09-17  Ian Lance Taylor  <iant@google.com>
+
+	* posix.c (backtrace_open): Cast second argument of open() to int.
+
+2015-09-11  Ian Lance Taylor  <iant@google.com>
+
+	* Makefile.am (backtrace.lo): Depend on internal.h.
+	(sort.lo, stest.lo): Add explicit dependencies.
+	* Makefile.in: Rebuild.
+
+2015-09-09  Hans-Peter Nilsson  <hp@axis.com>
+
+	* backtrace.c: #include <sys/types.h>.
+
+2015-09-08  Ian Lance Taylor  <iant@google.com>
+
+	PR other/67457
+	* backtrace.c: #include "internal.h".
+	(struct backtrace_data): Add can_alloc field.
+	(unwind): If can_alloc is false, don't try to get file/line
+	information.
+	(backtrace_full): Set can_alloc field in bdata.
+	* alloc.c (backtrace_alloc): Don't call error_callback if it is
+	NULL.
+	* mmap.c (backtrace_alloc): Likewise.
+	* internal.h: Update comments for backtrace_alloc and
+	backtrace_free.
+
+2015-09-08  Ian Lance Taylor  <iant@google.com>
+
+	PR other/67457
+	* mmap.c (backtrace_alloc): Correct test for mmap failure.
+
+2015-08-31  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* configure.ac: For spu-*-* targets, set have_fcntl to no.
+	* configure: Regenerate.
+
+2015-08-27  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* configure.ac: Remove [disable-shared] argument to LT_INIT.
+	Remove setting PIC_FLAG when building as target library.
+	* configure: Regenerate.
+
+2015-08-26  Hans-Peter Nilsson  <hp@axis.com>
+
+	* configure.ac: Only compile with -fPIC if the target
+	supports it.
+	* configure: Regenerate.
+
 2015-08-24  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* configure.ac: Set have_mmap to no on spu-*-* targets.
@@ -497,3 +564,9 @@
 2012-09-17  Ian Lance Taylor  <iant@google.com>
 
 	* Initial implementation.
+
+Copyright (C) 2012-2016 Free Software Foundation, Inc.
+
+Copying and distribution of this file, with or without modification,
+are permitted in any medium without royalty provided the copyright
+notice and this notice are preserved.

src/libbacktrace/Makefile.am

@@ -1,5 +1,5 @@
 # Makefile.am -- Backtrace Makefile.
-# Copyright (C) 2012-2015 Free Software Foundation, Inc.
+# 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
@@ -116,7 +116,7 @@ endif NATIVE
 
 INCDIR = $(top_srcdir)/../include
 alloc.lo: config.h backtrace.h internal.h
-backtrace.lo: config.h backtrace.h
+backtrace.lo: config.h backtrace.h internal.h
 btest.lo: (INCDIR)/filenames.h backtrace.h backtrace-supported.h
 dwarf.lo: config.h $(INCDIR)/dwarf2.h $(INCDIR)/dwarf2.def \
 	$(INCDIR)/filenames.h backtrace.h internal.h
@@ -130,5 +130,7 @@ 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

src/libbacktrace/Makefile.in

@@ -162,6 +162,7 @@ AUTOMAKE = @AUTOMAKE@
 AWK = @AWK@
 BACKTRACE_FILE = @BACKTRACE_FILE@
 BACKTRACE_SUPPORTED = @BACKTRACE_SUPPORTED@
+BACKTRACE_SUPPORTS_DATA = @BACKTRACE_SUPPORTS_DATA@
 BACKTRACE_SUPPORTS_THREADS = @BACKTRACE_SUPPORTS_THREADS@
 BACKTRACE_USES_MALLOC = @BACKTRACE_USES_MALLOC@
 CC = @CC@
@@ -745,7 +746,7 @@ uninstall-am:
 	uninstall-am
 
 alloc.lo: config.h backtrace.h internal.h
-backtrace.lo: config.h backtrace.h
+backtrace.lo: config.h backtrace.h internal.h
 btest.lo: (INCDIR)/filenames.h backtrace.h backtrace-supported.h
 dwarf.lo: config.h $(INCDIR)/dwarf2.h $(INCDIR)/dwarf2.def \
 	$(INCDIR)/filenames.h backtrace.h internal.h
@@ -759,6 +760,8 @@ 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
 

src/libbacktrace/alloc.c

@@ -1,5 +1,5 @@
 /* alloc.c -- Memory allocation without mmap.
-   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   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
@@ -44,7 +44,8 @@ POSSIBILITY OF SUCH DAMAGE.  */
    backtrace functions may not be safely invoked from a signal
    handler.  */
 
-/* Allocate memory like malloc.  */
+/* Allocate memory like malloc.  If ERROR_CALLBACK is NULL, don't
+   report an error.  */
 
 void *
 backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
@@ -55,7 +56,10 @@ backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
 
   ret = malloc (size);
   if (ret == NULL)
-    error_callback (data, "malloc", errno);
+    {
+      if (error_callback)
+	error_callback (data, "malloc", errno);
+    }
   return ret;
 }
 

src/libbacktrace/ansidecl.h

@@ -1,7 +1,5 @@
 /* ANSI and traditional C compatability macros
-   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
-   2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2013
-   Free Software Foundation, Inc.
+   Copyright (C) 1991-2015 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
 This program is free software; you can redistribute it and/or modify
@@ -276,6 +274,15 @@ So instead we use the macro below and test it against specific values.  */
 # endif /* GNUC >= 4.3 */
 #endif /* ATTRIBUTE_HOT */
 
+/* Attribute 'no_sanitize_undefined' was valid as of gcc 4.9.  */
+#ifndef ATTRIBUTE_NO_SANITIZE_UNDEFINED
+# if (GCC_VERSION >= 4009)
+#  define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined))
+# else
+#  define ATTRIBUTE_NO_SANITIZE_UNDEFINED
+# endif /* GNUC >= 4.9 */
+#endif /* ATTRIBUTE_NO_SANITIZE_UNDEFINED */
+
 /* We use __extension__ in some places to suppress -pedantic warnings
    about GCC extensions.  This feature didn't work properly before
    gcc 2.8.  */
@@ -304,6 +311,15 @@ So instead we use the macro below and test it against specific values.  */
 #define ENUM_BITFIELD(TYPE) __extension__ enum TYPE
 #else
 #define ENUM_BITFIELD(TYPE) unsigned int
+#endif
+
+    /* This is used to mark a class or virtual function as final.  */
+#if __cplusplus >= 201103L
+#define GCC_FINAL final
+#elif GCC_VERSION >= 4007
+#define GCC_FINAL __final
+#else
+#define GCC_FINAL
 #endif
 
 #ifdef __cplusplus

src/libbacktrace/atomic.c

@@ -1,5 +1,5 @@
 /* atomic.c -- Support for atomic functions if not present.
-   Copyright (C) 2013-2015 Free Software Foundation, Inc.
+   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

src/libbacktrace/backtrace-supported.h.in

@@ -1,5 +1,5 @@
 /* backtrace-supported.h.in -- Whether stack backtrace is supported.
-   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   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

src/libbacktrace/backtrace.c

@@ -1,5 +1,5 @@
 /* backtrace.c -- Entry point for stack backtrace library.
-   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   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
@@ -32,8 +32,11 @@ 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.  */
 
@@ -53,6 +56,8 @@ struct backtrace_data
   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
@@ -80,8 +85,11 @@ unwind (struct _Unwind_Context *context, void *vdata)
   if (!ip_before_insn)
     --pc;
 
-  bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
-				 bdata->error_callback, bdata->data);
+  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;
 
@@ -96,13 +104,26 @@ backtrace_full (struct backtrace_state *state, int skip,
 		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;
 }

src/libbacktrace/backtrace.h

@@ -1,5 +1,5 @@
 /* backtrace.h -- Public header file for stack backtrace library.
-   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   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

src/libbacktrace/btest.c

@@ -1,5 +1,5 @@
 /* btest.c -- Test for libbacktrace library
-   Copyright (C) 2012-2015 Free Software Foundation, Inc.
+   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