mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-09 18:31:13 +00:00
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
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* Copyright (C) 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(JIT)
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#include "ValueRecovery.h"
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#include "VirtualRegister.h"
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#include <wtf/Vector.h>
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namespace JSC {
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// A CachedRecovery is a wrapper around a ValueRecovery that records where said
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// value should go on the stack and/or in registers. Whenever we perform an
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// operation changing the ValueRecovery, we update the CachedRecovery's member
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// in place.
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class CachedRecovery {
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public:
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CachedRecovery(ValueRecovery recovery)
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: m_recovery { recovery }
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{
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}
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CachedRecovery(CachedRecovery&) = delete;
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CachedRecovery(CachedRecovery&&) = delete;
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CachedRecovery& operator=(CachedRecovery&) = delete;
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CachedRecovery& operator=(CachedRecovery&&) = delete;
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const Vector<VirtualRegister, 1>& targets() const { return m_targets; }
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void addTarget(VirtualRegister reg)
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{
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ASSERT(m_targets.isEmpty() || m_targets.last() < reg);
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m_targets.append(reg);
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}
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void removeTarget(VirtualRegister reg)
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{
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ASSERT_UNUSED(reg, m_targets.last() == reg);
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m_targets.shrink(m_targets.size() - 1);
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}
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void clearTargets()
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{
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m_targets.clear();
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}
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void setWantedJSValueRegs(JSValueRegs jsValueRegs)
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{
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ASSERT(m_wantedFPR == InvalidFPRReg);
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m_wantedJSValueRegs = jsValueRegs;
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}
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void setWantedFPR(FPRReg fpr)
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{
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ASSERT(!m_wantedJSValueRegs);
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m_wantedFPR = fpr;
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}
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// Determine whether converting this recovery into a JSValue will
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// require additional GPRs and/or FPRs.
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// This is guaranteed to only depend on the DataFormat, and the
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// result of these calls will stay valid after loads and/or stores.
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bool boxingRequiresGPR() const
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{
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#if USE(JSVALUE64)
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return recovery().dataFormat() == DataFormatDouble;
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#else
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return false;
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#endif
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}
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bool boxingRequiresFPR() const
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{
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#if USE(JSVALUE64)
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switch (recovery().dataFormat()) {
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case DataFormatInt52:
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case DataFormatStrictInt52:
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return true;
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default:
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return false;
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}
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#else
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return false;
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#endif
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}
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// This is used to determine what kind of register we need to be
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// able to load a recovery. We only use it when a direct load is
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// currently impossible, to determine whether we should spill a
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// GPR or an FPR for loading this value.
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bool loadsIntoGPR() const;
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bool loadsIntoFPR() const;
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ValueRecovery recovery() const { return m_recovery; }
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void setRecovery(ValueRecovery recovery) { m_recovery = recovery; }
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JSValueRegs wantedJSValueRegs() const { return m_wantedJSValueRegs; }
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FPRReg wantedFPR() const { return m_wantedFPR; }
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private:
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Vector<VirtualRegister, 1> m_targets;
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ValueRecovery m_recovery;
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JSValueRegs m_wantedJSValueRegs;
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FPRReg m_wantedFPR { InvalidFPRReg };
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};
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} // namespace JSC
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#endif // ENABLE(JIT)
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