/* * 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 tail, both due to due 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)