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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/mozalloc_abort.h"
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#ifdef ANDROID
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# include <android/log.h>
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#endif
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#ifdef MOZ_WIDGET_ANDROID
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# include "APKOpen.h"
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# include "dlfcn.h"
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#endif
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#include <stdio.h>
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#include "mozilla/Assertions.h"
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void
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mozalloc_abort(const char* const msg)
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{
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#ifndef ANDROID
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fputs(msg, stderr);
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fputs("\n", stderr);
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#else
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__android_log_print(ANDROID_LOG_ERROR, "Gecko", "mozalloc_abort: %s", msg);
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#endif
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#ifdef MOZ_WIDGET_ANDROID
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abortThroughJava(msg);
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#endif
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MOZ_CRASH();
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}
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#ifdef MOZ_WIDGET_ANDROID
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template <size_t N>
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void fillAbortMessage(char (&msg)[N], uintptr_t retAddress) {
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/*
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* On Android, we often don't have reliable backtrace when crashing inside
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* abort(). Therefore, we try to find out who is calling abort() and add
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* that to the message.
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*/
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Dl_info info = {};
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dladdr(reinterpret_cast<void*>(retAddress), &info);
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const char* const module = info.dli_fname ? info.dli_fname : "";
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const char* const base_module = strrchr(module, '/');
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const void* const module_offset =
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reinterpret_cast<void*>(retAddress - uintptr_t(info.dli_fbase));
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const char* const sym = info.dli_sname ? info.dli_sname : "";
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snprintf(msg, sizeof(msg), "abort() called from %s:%p (%s)",
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base_module ? base_module + 1 : module, module_offset, sym);
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}
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#endif
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#if defined(XP_UNIX) && !defined(MOZ_ASAN)
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// Define abort() here, so that it is used instead of the system abort(). This
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// lets us control the behavior when aborting, in order to get better results
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// on *NIX platforms. See mozalloc_abort for details.
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//
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// For AddressSanitizer, we must not redefine system abort because the ASan
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// option "abort_on_error=1" calls abort() and therefore causes the following
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// call chain with our redefined abort:
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//
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// ASan -> abort() -> moz_abort() -> MOZ_CRASH() -> Segmentation fault
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//
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// That segmentation fault will be interpreted as another bug by ASan and as a
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// result, ASan will just exit(1) instead of aborting.
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void abort(void)
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{
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#ifdef MOZ_WIDGET_ANDROID
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char msg[64] = {};
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fillAbortMessage(msg, uintptr_t(__builtin_return_address(0)));
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#else
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const char* const msg = "Redirecting call to abort() to mozalloc_abort\n";
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#endif
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mozalloc_abort(msg);
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// We won't reach here because mozalloc_abort() is MOZ_NORETURN. But that
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// annotation isn't used on ARM (see mozalloc_abort.h for why) so we add a
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// redundant MOZ_CRASH() here to avoid a "'noreturn' function does return"
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// warning.
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MOZ_CRASH();
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}
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#endif
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