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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
commit0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch)
treea31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /memory/mozalloc/mozalloc_oom.cpp
parentInitial commit. (diff)
downloadfirefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz
firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'memory/mozalloc/mozalloc_oom.cpp')
-rw-r--r--memory/mozalloc/mozalloc_oom.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/memory/mozalloc/mozalloc_oom.cpp b/memory/mozalloc/mozalloc_oom.cpp
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+++ b/memory/mozalloc/mozalloc_oom.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 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"
+#include "mozilla/mozalloc_oom.h"
+#include "mozilla/Assertions.h"
+
+#define OOM_MSG_LEADER "out of memory: 0x"
+#define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64
+#define OOM_MSG_TRAILER " bytes requested"
+#define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1
+#define OOM_MSG_LAST_DIGIT_OFFSET \
+ sizeof(OOM_MSG_LEADER) + sizeof(OOM_MSG_DIGITS) - 3
+
+MFBT_DATA size_t gOOMAllocationSize = 0;
+
+static const char* hex = "0123456789ABCDEF";
+
+void mozalloc_handle_oom(size_t size) {
+ char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER;
+ size_t i;
+
+ // NB: this is handle_oom() stage 1, which simply aborts on OOM.
+ // we might proceed to a stage 2 in which an attempt is made to
+ // reclaim memory
+ // Warning: when stage 2 is done by, for example, notifying
+ // "memory-pressure" synchronously, please audit all
+ // nsExpirationTrackers and ensure that the actions they take
+ // on memory-pressure notifications (via NotifyExpired) are safe.
+ // Note that Document::SelectorCache::NotifyExpired is _known_
+ // to not be safe: it will delete the selector it's caching,
+ // which might be in use at the time under querySelector or
+ // querySelectorAll.
+
+ gOOMAllocationSize = size;
+
+ static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0,
+ "Loop below will never terminate (i can't go below 0)");
+
+ // Insert size into the diagnostic message using only primitive operations
+ for (i = OOM_MSG_LAST_DIGIT_OFFSET; size && i >= OOM_MSG_FIRST_DIGIT_OFFSET;
+ i--) {
+ oomMsg[i] = hex[size % 16];
+ size /= 16;
+ }
+
+ mozalloc_abort(oomMsg);
+}