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/*
* Copyright (C) 2015-2017 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.
*/
#include "config.h"
#include "B3Effects.h"
#if ENABLE(B3_JIT)
#include <wtf/CommaPrinter.h>
namespace JSC { namespace B3 {
namespace {
// These helpers cascade in such a way that after the helper for terminal, we don't have to worry
// about terminal again, since the terminal case considers all ways that a terminal may interfere
// with something else. And after the exit sideways case, we don't have to worry about either
// exitsSideways or terminal. And so on...
bool interferesWithTerminal(const Effects& terminal, const Effects& other)
{
if (!terminal.terminal)
return false;
return other.terminal || other.controlDependent || other.writesLocalState || other.writes || other.writesPinned;
}
bool interferesWithExitSideways(const Effects& exitsSideways, const Effects& other)
{
if (!exitsSideways.exitsSideways)
return false;
return other.controlDependent || other.writes || other.writesPinned;
}
bool interferesWithWritesLocalState(const Effects& writesLocalState, const Effects& other)
{
if (!writesLocalState.writesLocalState)
return false;
return other.writesLocalState || other.readsLocalState;
}
bool interferesWithWritesPinned(const Effects& writesPinned, const Effects& other)
{
if (!writesPinned.writesPinned)
return false;
return other.writesPinned || other.readsPinned;
}
} // anonymous namespace
bool Effects::interferes(const Effects& other) const
{
return interferesWithTerminal(*this, other)
|| interferesWithTerminal(other, *this)
|| interferesWithExitSideways(*this, other)
|| interferesWithExitSideways(other, *this)
|| interferesWithWritesLocalState(*this, other)
|| interferesWithWritesLocalState(other, *this)
|| interferesWithWritesPinned(*this, other)
|| interferesWithWritesPinned(other, *this)
|| writes.overlaps(other.writes)
|| writes.overlaps(other.reads)
|| reads.overlaps(other.writes)
|| (fence && other.fence);
}
bool Effects::operator==(const Effects& other) const
{
return terminal == other.terminal
&& exitsSideways == other.exitsSideways
&& controlDependent == other.controlDependent
&& writesLocalState == other.writesLocalState
&& readsLocalState == other.readsLocalState
&& writesPinned == other.writesPinned
&& readsPinned == other.readsPinned
&& writes == other.writes
&& reads == other.reads
&& fence == other.fence;
}
void Effects::dump(PrintStream& out) const
{
CommaPrinter comma("|");
if (terminal)
out.print(comma, "Terminal");
if (exitsSideways)
out.print(comma, "ExitsSideways");
if (controlDependent)
out.print(comma, "ControlDependent");
if (writesLocalState)
out.print(comma, "WritesLocalState");
if (readsLocalState)
out.print(comma, "ReadsLocalState");
if (writesPinned)
out.print(comma, "WritesPinned");
if (readsPinned)
out.print(comma, "ReadsPinned");
if (fence)
out.print(comma, "Fence");
if (writes)
out.print(comma, "Writes:", writes);
if (reads)
out.print(comma, "Reads:", reads);
}
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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