1 files changed, 0 insertions, 222 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGVariableAccessData.cpp b/Source/JavaScriptCore/dfg/DFGVariableAccessData.cpp
deleted file mode 100644
index bd1ba87ee..000000000
--- a/Source/JavaScriptCore/dfg/DFGVariableAccessData.cpp
+++ /dev/null
@@ -1,222 +0,0 @@
-/*
- * Copyright (C) 2014, 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. 
- */
-
-#include "config.h"
-#include "DFGVariableAccessData.h"
-
-#if ENABLE(DFG_JIT)
-
-namespace JSC { namespace DFG {
-
-VariableAccessData::VariableAccessData()
-    : m_local(static_cast<VirtualRegister>(std::numeric_limits<int>::min()))
-    , m_prediction(SpecNone)
-    , m_argumentAwarePrediction(SpecNone)
-    , m_flags(0)
-    , m_shouldNeverUnbox(false)
-    , m_structureCheckHoistingFailed(false)
-    , m_checkArrayHoistingFailed(false)
-    , m_isProfitableToUnbox(false)
-    , m_isLoadedFrom(false)
-    , m_doubleFormatState(EmptyDoubleFormatState)
-{
-    clearVotes();
-}
-
-VariableAccessData::VariableAccessData(VirtualRegister local)
-    : m_local(local)
-    , m_prediction(SpecNone)
-    , m_argumentAwarePrediction(SpecNone)
-    , m_flags(0)
-    , m_shouldNeverUnbox(false)
-    , m_structureCheckHoistingFailed(false)
-    , m_checkArrayHoistingFailed(false)
-    , m_isProfitableToUnbox(false)
-    , m_isLoadedFrom(false)
-    , m_doubleFormatState(EmptyDoubleFormatState)
-{
-    clearVotes();
-}
-
-bool VariableAccessData::mergeShouldNeverUnbox(bool shouldNeverUnbox)
-{
-    bool newShouldNeverUnbox = m_shouldNeverUnbox | shouldNeverUnbox;
-    if (newShouldNeverUnbox == m_shouldNeverUnbox)
-        return false;
-    m_shouldNeverUnbox = newShouldNeverUnbox;
-    return true;
-}
-
-bool VariableAccessData::predict(SpeculatedType prediction)
-{
-    VariableAccessData* self = find();
-    bool result = mergeSpeculation(self->m_prediction, prediction);
-    if (result)
-        mergeSpeculation(m_argumentAwarePrediction, m_prediction);
-    return result;
-}
-
-bool VariableAccessData::mergeArgumentAwarePrediction(SpeculatedType prediction)
-{
-    return mergeSpeculation(find()->m_argumentAwarePrediction, prediction);
-}
-
-bool VariableAccessData::shouldUseDoubleFormatAccordingToVote()
-{
-    // We don't support this facility for arguments, yet.
-    // FIXME: make this work for arguments.
-    if (local().isArgument())
-        return false;
-        
-    // If the variable is not a number prediction, then this doesn't
-    // make any sense.
-    if (!isFullNumberSpeculation(prediction())) {
-        // FIXME: we may end up forcing a local in inlined argument position to be a double even
-        // if it is sometimes not even numeric, since this never signals the fact that it doesn't
-        // want doubles. https://bugs.webkit.org/show_bug.cgi?id=109511
-        return false;
-    }
-        
-    // If the variable is predicted to hold only doubles, then it's a
-    // no-brainer: it should be formatted as a double.
-    if (isDoubleSpeculation(prediction()))
-        return true;
-        
-    // If the variable is known to be used as an integer, then be safe -
-    // don't force it to be a double.
-    if (flags() & NodeBytecodeUsesAsInt)
-        return false;
-        
-    // If the variable has been voted to become a double, then make it a
-    // double.
-    if (voteRatio() >= Options::doubleVoteRatioForDoubleFormat())
-        return true;
-        
-    return false;
-}
-
-bool VariableAccessData::tallyVotesForShouldUseDoubleFormat()
-{
-    ASSERT(isRoot());
-        
-    if (local().isArgument() || shouldNeverUnbox()
-        || (flags() & NodeBytecodeUsesAsArrayIndex))
-        return DFG::mergeDoubleFormatState(m_doubleFormatState, NotUsingDoubleFormat);
-    
-    if (m_doubleFormatState == CantUseDoubleFormat)
-        return false;
-        
-    bool newValueOfShouldUseDoubleFormat = shouldUseDoubleFormatAccordingToVote();
-    if (!newValueOfShouldUseDoubleFormat) {
-        // We monotonically convert to double. Hence, if the fixpoint leads us to conclude that we should
-        // switch back to int, we instead ignore this and stick with double.
-        return false;
-    }
-        
-    if (m_doubleFormatState == UsingDoubleFormat)
-        return false;
-        
-    return DFG::mergeDoubleFormatState(m_doubleFormatState, UsingDoubleFormat);
-}
-
-bool VariableAccessData::mergeDoubleFormatState(DoubleFormatState doubleFormatState)
-{
-    return DFG::mergeDoubleFormatState(find()->m_doubleFormatState, doubleFormatState);
-}
-
-bool VariableAccessData::makePredictionForDoubleFormat()
-{
-    ASSERT(isRoot());
-    
-    if (m_doubleFormatState != UsingDoubleFormat)
-        return false;
-    
-    SpeculatedType type = m_prediction;
-    if (type & ~SpecBytecodeNumber)
-        type |= SpecDoublePureNaN;
-    if (type & SpecMachineInt)
-        type |= SpecInt52AsDouble;
-    return checkAndSet(m_prediction, type);
-}
-
-bool VariableAccessData::couldRepresentInt52()
-{
-    if (shouldNeverUnbox())
-        return false;
-    
-    return couldRepresentInt52Impl();
-}
-
-bool VariableAccessData::couldRepresentInt52Impl()
-{
-    // The hardware has to support it.
-    if (!enableInt52())
-        return false;
-    
-    // We punt for machine arguments.
-    if (m_local.isArgument())
-        return false;
-    
-    // The argument-aware prediction -- which merges all of an (inlined or machine)
-    // argument's variable access datas' predictions -- must possibly be MachineInt.
-    return !(argumentAwarePrediction() & ~SpecMachineInt);
-}
-
-FlushFormat VariableAccessData::flushFormat()
-{
-    ASSERT(find() == this);
-    
-    if (!shouldUnboxIfPossible())
-        return FlushedJSValue;
-    
-    if (shouldUseDoubleFormat())
-        return FlushedDouble;
-    
-    SpeculatedType prediction = argumentAwarePrediction();
-    
-    // This guard is here to protect the call to couldRepresentInt52(), which will return
-    // true for !prediction.
-    if (!prediction)
-        return FlushedJSValue;
-    
-    if (isInt32Speculation(prediction))
-        return FlushedInt32;
-    
-    if (couldRepresentInt52Impl())
-        return FlushedInt52;
-    
-    if (isCellSpeculation(prediction))
-        return FlushedCell;
-    
-    if (isBooleanSpeculation(prediction))
-        return FlushedBoolean;
-    
-    return FlushedJSValue;
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-