Add m-esr52 at 52.6.0

1 files changed, 89 insertions, 0 deletions

diff --git a/memory/mozalloc/mozalloc_abort.cpp b/memory/mozalloc/mozalloc_abort.cpp
new file mode 100644
index 000000000..a998d8164
--- /dev/null
+++ b/memory/mozalloc/mozalloc_abort.cpp
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: sw=4 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc_abort.h"
+
+#ifdef ANDROID
+# include <android/log.h>
+#endif
+#ifdef MOZ_WIDGET_ANDROID
+# include "APKOpen.h"
+# include "dlfcn.h"
+#endif
+#include <stdio.h>
+
+#include "mozilla/Assertions.h"
+
+void
+mozalloc_abort(const char* const msg)
+{
+#ifndef ANDROID
+    fputs(msg, stderr);
+    fputs("\n", stderr);
+#else
+    __android_log_print(ANDROID_LOG_ERROR, "Gecko", "mozalloc_abort: %s", msg);
+#endif
+#ifdef MOZ_WIDGET_ANDROID
+    abortThroughJava(msg);
+#endif
+    MOZ_CRASH();
+}
+
+#ifdef MOZ_WIDGET_ANDROID
+template <size_t N>
+void fillAbortMessage(char (&msg)[N], uintptr_t retAddress) {
+    /*
+     * On Android, we often don't have reliable backtrace when crashing inside
+     * abort(). Therefore, we try to find out who is calling abort() and add
+     * that to the message.
+     */
+    Dl_info info = {};
+    dladdr(reinterpret_cast<void*>(retAddress), &info);
+
+    const char* const module = info.dli_fname ? info.dli_fname : "";
+    const char* const base_module = strrchr(module, '/');
+    const void* const module_offset =
+        reinterpret_cast<void*>(retAddress - uintptr_t(info.dli_fbase));
+    const char* const sym = info.dli_sname ? info.dli_sname : "";
+
+    snprintf(msg, sizeof(msg), "abort() called from %s:%p (%s)",
+             base_module ? base_module + 1 : module, module_offset, sym);
+}
+#endif
+
+#if defined(XP_UNIX) && !defined(MOZ_ASAN)
+// Define abort() here, so that it is used instead of the system abort(). This
+// lets us control the behavior when aborting, in order to get better results
+// on *NIX platforms. See mozalloc_abort for details.
+//
+// For AddressSanitizer, we must not redefine system abort because the ASan
+// option "abort_on_error=1" calls abort() and therefore causes the following
+// call chain with our redefined abort:
+//
+// ASan -> abort() -> moz_abort() -> MOZ_CRASH() -> Segmentation fault
+//
+// That segmentation fault will be interpreted as another bug by ASan and as a
+// result, ASan will just exit(1) instead of aborting.
+void abort(void)
+{
+#ifdef MOZ_WIDGET_ANDROID
+    char msg[64] = {};
+    fillAbortMessage(msg, uintptr_t(__builtin_return_address(0)));
+#else
+    const char* const msg = "Redirecting call to abort() to mozalloc_abort\n";
+#endif
+
+    mozalloc_abort(msg);
+
+    // We won't reach here because mozalloc_abort() is MOZ_NORETURN. But that
+    // annotation isn't used on ARM (see mozalloc_abort.h for why) so we add a
+    // redundant MOZ_CRASH() here to avoid a "'noreturn' function does return"
+    // warning.
+    MOZ_CRASH();
+}
+#endif
+