webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 0 insertions, 208 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp b/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp
deleted file mode 100644
index c4db38268..000000000
--- a/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp
+++ /dev/null
@@ -1,208 +0,0 @@
-/*
- * Copyright (C) 2013 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 "DFGFlushLivenessAnalysisPhase.h"
-
-#if ENABLE(DFG_JIT)
-
-#include "DFGBasicBlockInlines.h"
-#include "DFGGraph.h"
-#include "DFGInsertionSet.h"
-#include "DFGPhase.h"
-#include "OperandsInlines.h"
-#include "Operations.h"
-
-namespace JSC { namespace DFG {
-
-class FlushLivenessAnalysisPhase : public Phase {
-public:
-    FlushLivenessAnalysisPhase(Graph& graph)
-        : Phase(graph, "flush-liveness analysis")
-    {
-    }
-    
-    bool run()
-    {
-        ASSERT(m_graph.m_form == SSA);
-        
-        // Liveness is a backwards analysis; the roots are the blocks that
-        // end in a terminal (Return/Unreachable). For now, we
-        // use a fixpoint formulation since liveness is a rapid analysis with
-        // convergence guaranteed after O(connectivity).
-        
-        // Start by assuming that everything is dead.
-        for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
-            BasicBlock* block = m_graph.block(blockIndex);
-            if (!block)
-                continue;
-            block->ssa->flushAtHead.fill(FlushedAt());
-            block->ssa->flushAtTail.fill(FlushedAt());
-        }
-        
-        do {
-            m_changed = false;
-            for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;)
-                process(blockIndex);
-        } while (m_changed);
-        
-        Operands<FlushedAt>& root = m_graph.block(0)->ssa->flushAtHead;
-        for (unsigned i = root.size(); i--;) {
-            if (root.isArgument(i)) {
-                if (!root[i]
-                    || root[i] == FlushedAt(FlushedJSValue, VirtualRegister(root.operandForIndex(i))))
-                    continue;
-            } else {
-                if (!root[i])
-                    continue;
-            }
-            dataLog(
-                "Bad flush liveness analysis result: bad flush liveness at root: ",
-                root, "\n");
-            dataLog("IR at time of error:\n");
-            m_graph.dump();
-            CRASH();
-        }
-        
-        return true;
-    }
-
-private:
-    void process(BlockIndex blockIndex)
-    {
-        BasicBlock* block = m_graph.block(blockIndex);
-        if (!block)
-            return;
-        
-        m_live = block->ssa->flushAtTail;
-        
-        for (unsigned nodeIndex = block->size(); nodeIndex--;) {
-            Node* node = block->at(nodeIndex);
-            
-            switch (node->op()) {
-            case SetLocal: {
-                VariableAccessData* variable = node->variableAccessData();
-                FlushedAt& current = m_live.operand(variable->local());
-                if (!!current && current != variable->flushedAt())
-                    reportError(node);
-                current = FlushedAt();
-                break;
-            }
-                
-            case GetArgument: {
-                VariableAccessData* variable = node->variableAccessData();
-                ASSERT(variable->local() == variable->machineLocal());
-                ASSERT(variable->local().isArgument());
-                FlushedAt& current = m_live.operand(variable->local());
-                if (!!current && current != variable->flushedAt())
-                    reportError(node);
-                current = FlushedAt(FlushedJSValue, node->local());
-                break;
-            }
-                
-            case Flush:
-            case GetLocal: {
-                VariableAccessData* variable = node->variableAccessData();
-                FlushedAt& current = m_live.operand(variable->local());
-                if (!!current && current != variable->flushedAt())
-                    reportError(node);
-                current = variable->flushedAt();
-                break;
-            }
-                
-            default:
-                break;
-            }
-        }
-        
-        if (m_live == block->ssa->flushAtHead)
-            return;
-        
-        m_changed = true;
-        block->ssa->flushAtHead = m_live;
-        for (unsigned i = block->predecessors.size(); i--;) {
-            BasicBlock* predecessor = block->predecessors[i];
-            for (unsigned j = m_live.size(); j--;) {
-                FlushedAt& predecessorFlush = predecessor->ssa->flushAtTail[j];
-                FlushedAt myFlush = m_live[j];
-                
-                // Three possibilities:
-                // 1) Predecessor format is Dead, in which case it acquires our format.
-                // 2) Predecessor format is not Dead but our format is dead, in which
-                //    case we acquire the predecessor format.
-                // 3) Predecessor format is identical to our format, in which case we
-                //    do nothing.
-                // 4) Predecessor format is different from our format and it's not Dead,
-                //    in which case we have an erroneous set of Flushes and SetLocals.
-
-                if (!predecessorFlush) {
-                    predecessorFlush = myFlush;
-                    continue;
-                }
-
-                if (!myFlush) {
-                    m_live[j] = predecessorFlush;
-                    continue;
-                }
-
-                if (predecessorFlush == myFlush)
-                    continue;
-                
-                dataLog(
-                    "Bad Flush merge at edge ", *predecessor, " -> ", *block,
-                    ", local variable r", m_live.operandForIndex(j), ": ", *predecessor,
-                    " has ", predecessorFlush, " and ", *block, " has ", myFlush, ".\n");
-                dataLog("IR at time of error:\n");
-                m_graph.dump();
-                CRASH();
-            }
-        }
-    }
-    
-    NO_RETURN_DUE_TO_CRASH void reportError(Node* node)
-    {
-        dataLog(
-            "Bad flush merge at node ", node, ", r", node->local(), ": node claims ",
-            node->variableAccessData()->flushedAt(), " but backwards flow claims ",
-            m_live.operand(node->local()), ".\n");
-        dataLog("IR at time of error:\n");
-        m_graph.dump();
-        CRASH();
-    }
-    
-    bool m_changed;
-    Operands<FlushedAt> m_live;
-};
-
-bool performFlushLivenessAnalysis(Graph& graph)
-{
-    SamplingRegion samplingRegion("DFG Flush-Liveness Analysis Phase");
-    return runPhase<FlushLivenessAnalysisPhase>(graph);
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-