webkitgtk-2.4.9webkitgtk-2.4.9

1 files changed, 0 insertions, 146 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGMovHintRemovalPhase.cpp b/Source/JavaScriptCore/dfg/DFGMovHintRemovalPhase.cpp
deleted file mode 100644
index e2cf37e90..000000000
--- a/Source/JavaScriptCore/dfg/DFGMovHintRemovalPhase.cpp
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * 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. 
- */
-
-#include "config.h"
-#include "DFGMovHintRemovalPhase.h"
-
-#if ENABLE(DFG_JIT)
-
-#include "BytecodeLivenessAnalysisInlines.h"
-#include "DFGEpoch.h"
-#include "DFGForAllKills.h"
-#include "DFGGraph.h"
-#include "DFGInsertionSet.h"
-#include "DFGMayExit.h"
-#include "DFGPhase.h"
-#include "JSCInlines.h"
-#include "OperandsInlines.h"
-
-namespace JSC { namespace DFG {
-
-namespace {
-
-bool verbose = false;
-
-class MovHintRemovalPhase : public Phase {
-public:
-    MovHintRemovalPhase(Graph& graph)
-        : Phase(graph, "MovHint removal")
-        , m_state(OperandsLike, graph.block(0)->variablesAtHead)
-        , m_changed(false)
-    {
-    }
-    
-    bool run()
-    {
-        if (verbose) {
-            dataLog("Graph before MovHint removal:\n");
-            m_graph.dump();
-        }
-        
-        for (BasicBlock* block : m_graph.blocksInNaturalOrder())
-            handleBlock(block);
-        
-        return m_changed;
-    }
-
-private:
-    void handleBlock(BasicBlock* block)
-    {
-        if (verbose)
-            dataLog("Handing block ", pointerDump(block), "\n");
-        
-        // A MovHint is unnecessary if the local dies before it is used. We answer this question by
-        // maintaining the current exit epoch, and associating an epoch with each local. When a
-        // local dies, it gets the current exit epoch. If a MovHint occurs in the same epoch as its
-        // local, then it means there was no exit between the local's death and the MovHint - i.e.
-        // the MovHint is unnecessary.
-        
-        Epoch currentEpoch = Epoch::first();
-        
-        m_state.fill(Epoch());
-        m_graph.forAllLiveInBytecode(
-            block->terminal()->origin.forExit,
-            [&] (VirtualRegister reg) {
-                m_state.operand(reg) = currentEpoch;
-            });
-        
-        if (verbose)
-            dataLog("    Locals: ", m_state, "\n");
-        
-        // Assume that blocks after us exit.
-        currentEpoch.bump();
-        
-        for (unsigned nodeIndex = block->size(); nodeIndex--;) {
-            Node* node = block->at(nodeIndex);
-            
-            if (node->op() == MovHint) {
-                Epoch localEpoch = m_state.operand(node->unlinkedLocal());
-                if (verbose)
-                    dataLog("    At ", node, ": current = ", currentEpoch, ", local = ", localEpoch, "\n");
-                if (!localEpoch || localEpoch == currentEpoch) {
-                    node->setOpAndDefaultFlags(ZombieHint);
-                    node->child1() = Edge();
-                    m_changed = true;
-                }
-                m_state.operand(node->unlinkedLocal()) = Epoch();
-            }
-            
-            if (mayExit(m_graph, node))
-                currentEpoch.bump();
-            
-            if (nodeIndex) {
-                forAllKilledOperands(
-                    m_graph, block->at(nodeIndex - 1), node,
-                    [&] (VirtualRegister reg) {
-                        // This function is a bit sloppy - it might claim to kill a local even if
-                        // it's still live after. We need to protect against that.
-                        if (!!m_state.operand(reg))
-                            return;
-                        
-                        if (verbose)
-                            dataLog("    Killed operand at ", node, ": ", reg, "\n");
-                        m_state.operand(reg) = currentEpoch;
-                    });
-            }
-        }
-    }
-    
-    Operands<Epoch> m_state;
-    bool m_changed;
-};
-
-} // anonymous namespace
-    
-bool performMovHintRemoval(Graph& graph)
-{
-    SamplingRegion samplingRegion("DFG MovHint Removal Phase");
-    return runPhase<MovHintRemovalPhase>(graph);
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-