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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /memory/mozalloc/mozalloc_oom.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'memory/mozalloc/mozalloc_oom.cpp')
-rw-r--r--memory/mozalloc/mozalloc_oom.cpp53
1 files changed, 53 insertions, 0 deletions
diff --git a/memory/mozalloc/mozalloc_oom.cpp b/memory/mozalloc/mozalloc_oom.cpp
new file mode 100644
index 000000000..820888cdb
--- /dev/null
+++ b/memory/mozalloc/mozalloc_oom.cpp
@@ -0,0 +1,53 @@
+/* -*- 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"
+#include "mozilla/mozalloc_oom.h"
+#include "mozilla/Assertions.h"
+
+static mozalloc_oom_abort_handler gAbortHandler;
+
+#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
+
+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
+
+ if (gAbortHandler)
+ gAbortHandler(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);
+}
+
+void
+mozalloc_set_oom_abort_handler(mozalloc_oom_abort_handler handler)
+{
+ gAbortHandler = handler;
+}