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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.
*/
#pragma once
#if ENABLE(B3_JIT)
#include "B3Bank.h"
#include "B3HeapRange.h"
#include "B3Value.h"
#include <type_traits>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace B3 {
class JS_EXPORT_PRIVATE MemoryValue : public Value {
public:
static bool accepts(Kind kind)
{
return isMemoryAccess(kind.opcode());
}
~MemoryValue() override;
OffsetType offset() const { return m_offset; }
template<typename Int, typename = IsLegalOffset<Int>>
void setOffset(Int offset) { m_offset = offset; }
// You don't have to worry about using legal offsets unless you've entered quirks mode.
template<typename Int,
typename = typename std::enable_if<std::is_integral<Int>::value>::type,
typename = typename std::enable_if<std::is_signed<Int>::value>::type
>
bool isLegalOffset(Int offset) const { return isLegalOffsetImpl(offset); }
// A necessary consequence of MemoryValue having an offset is that it participates in instruction
// selection. This tells you if this will get lowered to something that requires an offsetless
// address.
inline bool requiresSimpleAddr() const;
const HeapRange& range() const { return m_range; }
void setRange(const HeapRange& range) { m_range = range; }
// This is an alias for range.
const HeapRange& accessRange() const { return range(); }
void setAccessRange(const HeapRange& range) { setRange(range); }
const HeapRange& fenceRange() const { return m_fenceRange; }
void setFenceRange(const HeapRange& range) { m_fenceRange = range; }
bool isStore() const { return B3::isStore(opcode()); }
bool isLoad() const { return B3::isLoad(opcode()); }
bool hasFence() const { return !!fenceRange(); }
bool isExotic() const { return hasFence() || isAtom(opcode()); }
Type accessType() const;
Bank accessBank() const;
size_t accessByteSize() const;
inline Width accessWidth() const;
inline bool isCanonicalWidth() const;
B3_SPECIALIZE_VALUE_FOR_NON_VARARGS_CHILDREN
protected:
void dumpMeta(CommaPrinter&, PrintStream&) const override;
template<typename Int, typename = IsLegalOffset<Int>, typename... Arguments>
MemoryValue(CheckedOpcodeTag, Kind kind, Type type, NumChildren numChildren, Origin origin, Int offset, HeapRange range, HeapRange fenceRange, Arguments... arguments)
: Value(CheckedOpcode, kind, type, numChildren, origin, static_cast<Value*>(arguments)...)
, m_offset(offset)
, m_range(range)
, m_fenceRange(fenceRange)
{
}
private:
friend class Procedure;
friend class Value;
inline bool isLegalOffsetImpl(int32_t offset) const;
bool isLegalOffsetImpl(int64_t offset) const;
enum MemoryValueLoad { MemoryValueLoadTag };
enum MemoryValueLoadImplied { MemoryValueLoadImpliedTag };
enum MemoryValueStore { MemoryValueStoreTag };
// Use this form for Load (but not Load8Z, Load8S, or any of the Loads that have a suffix that
// describes the returned type).
MemoryValue(Kind kind, Type type, Origin origin, Value* pointer)
: MemoryValue(MemoryValueLoadTag, kind, type, origin, pointer)
{
}
template<typename Int, typename = IsLegalOffset<Int>>
MemoryValue(Kind kind, Type type, Origin origin, Value* pointer, Int offset, HeapRange range = HeapRange::top(), HeapRange fenceRange = HeapRange())
: MemoryValue(MemoryValueLoadTag, kind, type, origin, pointer, offset, range, fenceRange)
{
}
// Use this form for loads where the return type is implied.
MemoryValue(Kind kind, Origin origin, Value* pointer)
: MemoryValue(MemoryValueLoadImpliedTag, kind, origin, pointer)
{
}
template<typename Int, typename = IsLegalOffset<Int>>
MemoryValue(Kind kind, Origin origin, Value* pointer, Int offset, HeapRange range = HeapRange::top(), HeapRange fenceRange = HeapRange())
: MemoryValue(MemoryValueLoadImpliedTag, kind, origin, pointer, offset, range, fenceRange)
{
}
// Use this form for stores.
MemoryValue(Kind kind, Origin origin, Value* value, Value* pointer)
: MemoryValue(MemoryValueStoreTag, kind, origin, value, pointer)
{
}
template<typename Int, typename = IsLegalOffset<Int>>
MemoryValue(Kind kind, Origin origin, Value* value, Value* pointer, Int offset, HeapRange range = HeapRange::top(), HeapRange fenceRange = HeapRange())
: MemoryValue(MemoryValueStoreTag, kind, origin, value, pointer, offset, range, fenceRange)
{
}
// The above templates forward to these implementations.
MemoryValue(MemoryValueLoad, Kind, Type, Origin, Value* pointer, OffsetType = 0, HeapRange = HeapRange::top(), HeapRange fenceRange = HeapRange());
MemoryValue(MemoryValueLoadImplied, Kind, Origin, Value* pointer, OffsetType = 0, HeapRange = HeapRange::top(), HeapRange fenceRange = HeapRange());
MemoryValue(MemoryValueStore, Kind, Origin, Value*, Value* pointer, OffsetType = 0, HeapRange = HeapRange::top(), HeapRange fenceRange = HeapRange());
OffsetType m_offset { 0 };
HeapRange m_range { HeapRange::top() };
HeapRange m_fenceRange { HeapRange() };
};
} } // namespace JSC::B3
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(B3_JIT)
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