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DFGCombinedLiveness.h
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54 lines (44 loc) · 2.25 KB
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/*
* Copyright (C) 2015-2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "DFGBlockMap.h"
#include "DFGGraph.h"
namespace JSC { namespace DFG {
// Returns the set of nodes live at head, both due to DFG and due to bytecode (i.e. OSR exit).
NodeSet liveNodesAtHead(Graph&, BasicBlock*);
// WARNING: This currently does not reason about the liveness of shadow values. The execution
// semantics of DFG SSA are that an Upsilon stores to the shadow value of a Phi, and the Phi loads
// from that shadow value. Hence, the shadow values are like variables, and have liveness. The normal
// liveness analysis will tell you about the liveness of shadow values. It's OK to ignore shadow
// values if you treat Upsilon as an opaque escape, and all of the clients of CombinedLiveness do so.
struct CombinedLiveness {
CombinedLiveness() { }
CombinedLiveness(Graph&);
BlockMap<NodeSet> liveAtHead;
BlockMap<NodeSet> liveAtTail;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)