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45 lines
1.6 KiB
C++
45 lines
1.6 KiB
C++
//===--- Notifications.h - SIL Undef Value Representation -------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SIL_NOTIFICATIONS_H
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#define SWIFT_SIL_NOTIFICATIONS_H
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namespace swift {
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class ValueBase;
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/// A protocol (or interface) for handling value deletion notifications.
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///
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/// This class is used as a base class for any class that need to accept
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/// instruction deletion notification messages. This is used by passes and
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/// analysis that need to invalidate data structures that contain pointers.
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/// This is similar to LLVM's ValueHandle.
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struct DeleteNotificationHandler {
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DeleteNotificationHandler() { }
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virtual ~DeleteNotificationHandler() {}
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/// Handle the invalidation message for the value \p Value.
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virtual void handleDeleteNotification(swift::ValueBase *Value) { }
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/// Returns True if the pass, analysis or other entity wants to receive
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/// notifications. This callback is called once when the class is being
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/// registered, and not once per notification. Entities that implement
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/// this callback should always return a constant answer (true/false).
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virtual bool needsNotifications() { return false; }
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};
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} // end swift namespace
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#endif
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