From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- memory/mozalloc/mozalloc_oom.cpp | 52 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 memory/mozalloc/mozalloc_oom.cpp (limited to 'memory/mozalloc/mozalloc_oom.cpp') diff --git a/memory/mozalloc/mozalloc_oom.cpp b/memory/mozalloc/mozalloc_oom.cpp new file mode 100644 index 0000000000..efe5dab4a2 --- /dev/null +++ b/memory/mozalloc/mozalloc_oom.cpp @@ -0,0 +1,52 @@ +/* -*- 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); +} -- cgit v1.2.3