JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / dfg / DFGInvalidationPointInjectionPhase.cpp

diff --git a/dfg/DFGInvalidationPointInjectionPhase.cpp b/dfg/DFGInvalidationPointInjectionPhase.cpp
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+/*
+ * 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 "DFGInvalidationPointInjectionPhase.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGClobberize.h"
+#include "DFGGraph.h"
+#include "DFGInsertionSet.h"
+#include "DFGPhase.h"
+#include "JSCInlines.h"
+
+namespace JSC { namespace DFG {
+
+class InvalidationPointInjectionPhase : public Phase {
+    static const bool verbose = false;
+    
+public:
+    InvalidationPointInjectionPhase(Graph& graph)
+        : Phase(graph, "invalidation point injection")
+        , m_insertionSet(graph)
+    {
+    }
+    
+    bool run()
+    {
+        ASSERT(m_graph.m_form != SSA);
+        
+        BitVector blocksThatNeedInvalidationPoints;
+        
+        for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
+            BasicBlock* block = m_graph.block(blockIndex);
+            if (!block)
+                continue;
+            
+            for (unsigned nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex)
+                handle(nodeIndex, block->at(nodeIndex));
+            
+            // Note: this assumes that control flow occurs at bytecode instruction boundaries.
+            if (m_originThatHadFire.isSet()) {
+                for (unsigned i = block->numSuccessors(); i--;)
+                    blocksThatNeedInvalidationPoints.set(block->successor(i)->index);
+            }
+            
+            m_insertionSet.execute(block);
+        }
+        
+        for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
+            if (!blocksThatNeedInvalidationPoints.get(blockIndex))
+                continue;
+            
+            BasicBlock* block = m_graph.block(blockIndex);
+            insertInvalidationCheck(0, block->at(0));
+            m_insertionSet.execute(block);
+        }
+        
+        return true;
+    }
+
+private:
+    void handle(unsigned nodeIndex, Node* node)
+    {
+        if (m_originThatHadFire.isSet() && m_originThatHadFire != node->origin.forExit) {
+            insertInvalidationCheck(nodeIndex, node);
+            m_originThatHadFire = CodeOrigin();
+        }
+        
+        if (writesOverlap(m_graph, node, Watchpoint_fire))
+            m_originThatHadFire = node->origin.forExit;
+    }
+    
+    void insertInvalidationCheck(unsigned nodeIndex, Node* node)
+    {
+        m_insertionSet.insertNode(nodeIndex, SpecNone, InvalidationPoint, node->origin);
+    }
+    
+    CodeOrigin m_originThatHadFire;
+    InsertionSet m_insertionSet;
+};
+
+bool performInvalidationPointInjection(Graph& graph)
+{
+    SamplingRegion samplingRegion("DFG Invalidation Point Injection Phase");
+    return runPhase<InvalidationPointInjectionPhase>(graph);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+