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authorLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
commit32761a6cee1d0dee366b885b7b9c777e67885688 (patch)
treed6bec92bebfb216f4126356e55518842c2f476a1 /Source/JavaScriptCore/jit/CachedRecovery.h
parenta4e969f4965059196ca948db781e52f7cfebf19e (diff)
downloadWebKitGtk-tarball-32761a6cee1d0dee366b885b7b9c777e67885688.tar.gz
webkitgtk-2.4.11webkitgtk-2.4.11
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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.
- */
-
-#ifndef CachedRecovery_h
-#define CachedRecovery_h
-
-#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:
- ValueRecovery m_recovery;
- JSValueRegs m_wantedJSValueRegs;
- FPRReg m_wantedFPR { InvalidFPRReg };
- Vector<VirtualRegister, 1> m_targets;
-};
-
-} // namespace JSC
-
-#endif // ENABLE(JIT)
-
-#endif // CachedRecovery_h