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/*
* Copyright (C) 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.
*/
#pragma once
#if ENABLE(B3_JIT)
#include "AirArg.h"
#include "AirHelpers.h"
#include "AirOpcode.h"
#include "B3AtomicValue.h"
namespace JSC { namespace B3 {
inline bool MemoryValue::isLegalOffsetImpl(int32_t offset) const
{
// NOTE: This is inline because it constant-folds to true on x86!
// So far only X86 allows exotic loads to have an offset.
if (requiresSimpleAddr())
return !offset;
// The opcode is only used on ARM and Air::Move is appropriate for
// loads/stores.
return Air::Arg::isValidAddrForm(Air::moveForType(accessType()), offset, accessWidth());
}
inline bool MemoryValue::requiresSimpleAddr() const
{
return !isX86() && isExotic();
}
inline Width MemoryValue::accessWidth() const
{
switch (opcode()) {
case Load8Z:
case Load8S:
case Store8:
return Width8;
case Load16Z:
case Load16S:
case Store16:
return Width16;
case Load:
return widthForType(type());
case Store:
return widthForType(child(0)->type());
case AtomicWeakCAS:
case AtomicStrongCAS:
case AtomicXchgAdd:
case AtomicXchgAnd:
case AtomicXchgOr:
case AtomicXchgSub:
case AtomicXchgXor:
case AtomicXchg:
return as<AtomicValue>()->accessWidth();
default:
RELEASE_ASSERT_NOT_REACHED();
return Width8;
}
}
inline bool MemoryValue::isCanonicalWidth() const
{
return JSC::isCanonicalWidth(accessWidth());
}
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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