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/*
* Copyright (C) 2015-2023 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 "AirStackSlotKind.h"
#include "B3SparseCollection.h"
#include <limits.h>
#include <wtf/FastMalloc.h>
#include <wtf/Noncopyable.h>
#include <wtf/PrintStream.h>
#include <wtf/TZoneMalloc.h>
namespace JSC { namespace B3 {
class StackSlot;
namespace Air {
class StackSlot {
WTF_MAKE_NONCOPYABLE(StackSlot);
WTF_MAKE_TZONE_ALLOCATED(StackSlot);
public:
unsigned byteSize() const { return m_byteSize; }
StackSlotKind kind() const { return m_kind; }
bool isLocked() const { return m_kind == StackSlotKind::Locked; }
bool isSpill() const { return m_kind == StackSlotKind::Spill; }
unsigned index() const { return m_index; }
void ensureSize(uint64_t requestedSize)
{
ASSERT(!m_offsetFromFP);
RELEASE_ASSERT(requestedSize <= std::numeric_limits<uint32_t>::max());
m_byteSize = std::max(m_byteSize, static_cast<uint32_t>(requestedSize));
}
unsigned alignment() const
{
if (byteSize() <= 1)
return 1;
if (byteSize() <= 2)
return 2;
if (byteSize() <= 4)
return 4;
return 8;
}
// Zero means that it's not yet assigned.
intptr_t offsetFromFP() const { return m_offsetFromFP; }
// This should usually just be called from phases that do stack allocation. But you can
// totally force a stack slot to land at some offset.
void setOffsetFromFP(intptr_t);
// This computes a hash for comparing this to JSAir's StackSlot.
unsigned jsHash() const;
void dump(PrintStream&) const;
void deepDump(PrintStream&) const;
private:
friend class Code;
friend class SparseCollection<StackSlot>;
StackSlot(uint64_t byteSize, StackSlotKind, intptr_t offsetFromFP = 0);
uint32_t m_byteSize { 0 };
StackSlotKind m_kind { StackSlotKind::Locked };
unsigned m_index { UINT_MAX };
intptr_t m_offsetFromFP { 0 };
};
class DeepStackSlotDump {
public:
DeepStackSlotDump(const StackSlot* slot)
: m_slot(slot)
{
}
void dump(PrintStream& out) const
{
if (m_slot)
m_slot->deepDump(out);
else
out.print("<null>");
}
private:
const StackSlot* m_slot;
};
inline DeepStackSlotDump deepDump(const StackSlot* slot)
{
return DeepStackSlotDump(slot);
}
} } } // namespace JSC::B3::Air
namespace WTF {
inline void printInternal(PrintStream& out, JSC::B3::Air::StackSlot* stackSlot)
{
out.print(pointerDump(stackSlot));
}
} // namespace WTF
#endif // ENABLE(B3_JIT)
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