1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : * vim: sw=4 ts=4 et :
3 : */
4 : /* ***** BEGIN LICENSE BLOCK *****
5 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 : *
7 : * The contents of this file are subject to the Mozilla Public License Version
8 : * 1.1 (the "License"); you may not use this file except in compliance with
9 : * the License. You may obtain a copy of the License at
10 : * http://www.mozilla.org/MPL/
11 : *
12 : * Software distributed under the License is distributed on an "AS IS" basis,
13 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 : * for the specific language governing rights and limitations under the
15 : * License.
16 : *
17 : * The Original Code is Mozilla Code
18 : *
19 : * The Initial Developer of the Original Code is
20 : * The Mozilla Foundation.
21 : * Portions created by the Initial Developer are Copyright (C) 2010
22 : * the Initial Developer. All Rights Reserved.
23 : *
24 : * Contributor(s):
25 : * Chris Jones <jones.chris.g@gmail.com>
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either the GNU General Public License Version 2 or later (the "GPL"), or
29 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 : #include <stdio.h>
42 : #include <stdlib.h> // for abort()
43 :
44 : #if defined(_MSC_VER) // MSVC
45 : # include <intrin.h> // for __debugbreak()
46 : #elif defined(XP_WIN) // mingw
47 : # include <windows.h> // for DebugBreak
48 : #elif defined(XP_UNIX)
49 : # include <unistd.h> // for _exit
50 : # include <signal.h>
51 : #endif
52 :
53 : #if defined(XP_WIN) || defined(XP_OS2)
54 : # define MOZALLOC_EXPORT __declspec(dllexport)
55 : #endif
56 :
57 : #include "mozilla/mozalloc_abort.h"
58 :
59 : static int gDummyCounter;
60 :
61 : // Not inlining this function avoids the compiler making optimizations
62 : // that end up corrupting stack traces.
63 : MOZ_NEVER_INLINE static void
64 0 : TouchBadMemory()
65 : {
66 : // XXX this should use the frame poisoning code
67 0 : volatile int *p = 0;
68 0 : gDummyCounter += *p; // TODO annotation saying we know
69 : // this is crazy
70 0 : }
71 :
72 : void
73 0 : mozalloc_abort(const char* const msg)
74 : {
75 0 : fputs(msg, stderr);
76 0 : fputs("\n", stderr);
77 :
78 : #if defined(_MSC_VER)
79 : __debugbreak();
80 : #elif defined(XP_WIN)
81 : DebugBreak();
82 : #endif
83 :
84 : // On *NIX platforms the prefered way to abort is by touching bad memory,
85 : // since this generates a stack trace inside our own code (avoiding
86 : // problems with starting the trace inside libc, where we might not have
87 : // symbols and can get lost).
88 :
89 0 : TouchBadMemory();
90 :
91 : // If we haven't aborted yet, we can try to raise SIGABRT which might work
92 : // on some *NIXs, but not OS X (it doesn't trigger breakpad there).
93 : // Note that we don't call abort(), since raise is likelier to give us
94 : // useful stack data, and also since abort() is redirected to call this
95 : // function (see below).
96 : #if defined(XP_UNIX) && !defined(XP_MACOSX)
97 0 : raise(SIGABRT);
98 : #endif
99 :
100 : // Still haven't aborted? Try _exit().
101 0 : _exit(127);
102 : }
103 :
104 : #if defined(XP_UNIX)
105 : // Define abort() here, so that it is used instead of the system abort(). This
106 : // lets us control the behavior when aborting, in order to get better results
107 : // on *NIX platfrorms. See mozalloc_abort for details.
108 0 : void abort(void)
109 : {
110 0 : mozalloc_abort("Redirecting call to abort() to mozalloc_abort\n");
111 : }
112 : #endif
113 :
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