1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/ds/MemoryProtectionExceptionHandler.h b/js/src/ds/MemoryProtectionExceptionHandler.h
new file mode 100644
index 000000000..c8b96679c
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+++ b/js/src/ds/MemoryProtectionExceptionHandler.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#ifndef ds_MemoryProtectionExceptionHandler_h
+#define ds_MemoryProtectionExceptionHandler_h
+
+#include "jstypes.h"
+
+namespace js {
+
+/*
+ * This structure allows you to annotate crashes resulting from unauthorized
+ * access to protected memory in regions of interest, to make them stand out
+ * from other heap corruption crashes.
+ */
+
+struct MemoryProtectionExceptionHandler
+{
+    /* Installs the exception handler; called early during initialization. */
+    static bool install();
+
+    /* If the exception handler is disabled, it won't be installed. */
+    static bool isDisabled();
+
+    /*
+     * Marks a region of memory as important; if something tries to access this
+     * region in an unauthorized way (e.g. writing to read-only memory),
+     * the resulting crash will be annotated to stand out from other random
+     * heap corruption.
+     */
+    static void addRegion(void* addr, size_t size);
+
+    /* Removes a previously added region. */
+    static void removeRegion(void* addr);
+
+    /* Uninstalls the exception handler; called late during shutdown. */
+    static void uninstall();
+};
+
+} /* namespace js */
+
+#endif /* ds_MemoryProtectionExceptionHandler_h */