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/*
* Copyright (C) 2015 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(JIT)
#include "ValueRecovery.h"
#include "VirtualRegister.h"
#include <wtf/Vector.h>
namespace JSC {
// A CachedRecovery is a wrapper around a ValueRecovery that records where said
// value should go on the stack and/or in registers. Whenever we perform an
// operation changing the ValueRecovery, we update the CachedRecovery's member
// in place.
class CachedRecovery {
public:
CachedRecovery(ValueRecovery recovery)
: m_recovery { recovery }
{
}
CachedRecovery(CachedRecovery&) = delete;
CachedRecovery(CachedRecovery&&) = delete;
CachedRecovery& operator=(CachedRecovery&) = delete;
CachedRecovery& operator=(CachedRecovery&&) = delete;
const Vector<VirtualRegister, 1>& targets() const { return m_targets; }
void addTarget(VirtualRegister reg)
{
ASSERT(m_targets.isEmpty() || m_targets.last() < reg);
m_targets.append(reg);
}
void removeTarget(VirtualRegister reg)
{
ASSERT_UNUSED(reg, m_targets.last() == reg);
m_targets.shrink(m_targets.size() - 1);
}
void clearTargets()
{
m_targets.clear();
}
void setWantedJSValueRegs(JSValueRegs jsValueRegs)
{
ASSERT(m_wantedFPR == InvalidFPRReg);
m_wantedJSValueRegs = jsValueRegs;
}
void setWantedFPR(FPRReg fpr)
{
ASSERT(!m_wantedJSValueRegs);
m_wantedFPR = fpr;
}
// Determine whether converting this recovery into a JSValue will
// require additional GPRs and/or FPRs.
// This is guaranteed to only depend on the DataFormat, and the
// result of these calls will stay valid after loads and/or stores.
bool boxingRequiresGPR() const
{
#if USE(JSVALUE64)
return recovery().dataFormat() == DataFormatDouble;
#else
return false;
#endif
}
bool boxingRequiresFPR() const
{
#if USE(JSVALUE64)
switch (recovery().dataFormat()) {
case DataFormatInt52:
case DataFormatStrictInt52:
return true;
default:
return false;
}
#else
return false;
#endif
}
// This is used to determine what kind of register we need to be
// able to load a recovery. We only use it when a direct load is
// currently impossible, to determine whether we should spill a
// GPR or an FPR for loading this value.
bool loadsIntoGPR() const;
bool loadsIntoFPR() const;
ValueRecovery recovery() const { return m_recovery; }
void setRecovery(ValueRecovery recovery) { m_recovery = recovery; }
JSValueRegs wantedJSValueRegs() const { return m_wantedJSValueRegs; }
FPRReg wantedFPR() const { return m_wantedFPR; }
private:
Vector<VirtualRegister, 1> m_targets;
ValueRecovery m_recovery;
JSValueRegs m_wantedJSValueRegs;
FPRReg m_wantedFPR { InvalidFPRReg };
};
} // namespace JSC
#endif // ENABLE(JIT)
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