1 files changed, 109 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGAvailabilityMap.cpp b/Source/JavaScriptCore/dfg/DFGAvailabilityMap.cpp
new file mode 100644
index 000000000..e319dc6f2
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGAvailabilityMap.cpp
@@ -0,0 +1,109 @@
+/*
+ * 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 "DFGAvailabilityMap.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGGraph.h"
+#include "JSCInlines.h"
+#include "OperandsInlines.h"
+#include <wtf/ListDump.h>
+
+namespace JSC { namespace DFG {
+
+void AvailabilityMap::pruneHeap()
+{
+    if (m_heap.isEmpty())
+        return;
+    
+    HashSet<Node*> possibleNodes;
+    
+    for (unsigned i = m_locals.size(); i--;) {
+        if (m_locals[i].hasNode())
+            possibleNodes.add(m_locals[i].node());
+    }
+
+    closeOverNodes(
+        [&] (Node* node) -> bool {
+            return possibleNodes.contains(node);
+        },
+        [&] (Node* node) -> bool {
+            return possibleNodes.add(node).isNewEntry;
+        });
+    
+    HashMap<PromotedHeapLocation, Availability> newHeap;
+    for (auto pair : m_heap) {
+        if (possibleNodes.contains(pair.key.base()))
+            newHeap.add(pair.key, pair.value);
+    }
+    m_heap = newHeap;
+}
+
+void AvailabilityMap::pruneByLiveness(Graph& graph, CodeOrigin where)
+{
+    Operands<Availability> localsCopy(OperandsLike, m_locals);
+    graph.forAllLiveInBytecode(
+        where,
+        [&] (VirtualRegister reg) {
+            localsCopy.operand(reg) = m_locals.operand(reg);
+        });
+    m_locals = localsCopy;
+    pruneHeap();
+}
+
+void AvailabilityMap::clear()
+{
+    m_locals.fill(Availability());
+    m_heap.clear();
+}
+
+void AvailabilityMap::dump(PrintStream& out) const
+{
+    out.print("{locals = ", m_locals, "; heap = ", mapDump(m_heap), "}");
+}
+
+bool AvailabilityMap::operator==(const AvailabilityMap& other) const
+{
+    return m_locals == other.m_locals
+        && m_heap == other.m_heap;
+}
+
+void AvailabilityMap::merge(const AvailabilityMap& other)
+{
+    for (unsigned i = other.m_locals.size(); i--;)
+        m_locals[i] = other.m_locals[i].merge(m_locals[i]);
+    
+    for (auto pair : other.m_heap) {
+        auto result = m_heap.add(pair.key, Availability());
+        result.iterator->value = pair.value.merge(result.iterator->value);
+    }
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+