1 files changed, 150 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGSSACalculator.cpp b/Source/JavaScriptCore/dfg/DFGSSACalculator.cpp
new file mode 100644
index 000000000..899fa15f9
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGSSACalculator.cpp
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2014 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 "DFGSSACalculator.h"
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGBlockMapInlines.h"
+#include <wtf/CommaPrinter.h>
+#include <wtf/ListDump.h>
+
+namespace JSC { namespace DFG {
+
+void SSACalculator::Variable::dump(PrintStream& out) const
+{
+    out.print("var", m_index);
+}
+
+void SSACalculator::Variable::dumpVerbose(PrintStream& out) const
+{
+    dump(out);
+    if (!m_blocksWithDefs.isEmpty()) {
+        out.print("(defs: ");
+        CommaPrinter comma;
+        for (BasicBlock* block : m_blocksWithDefs)
+            out.print(comma, *block);
+        out.print(")");
+    }
+}
+
+void SSACalculator::Def::dump(PrintStream& out) const
+{
+    out.print("def(", *m_variable, ", ", *m_block, ", ", m_value, ")");
+}
+
+SSACalculator::SSACalculator(Graph& graph)
+    : m_data(graph)
+    , m_graph(graph)
+{
+}
+
+SSACalculator::~SSACalculator()
+{
+}
+
+void SSACalculator::reset()
+{
+    m_variables.clear();
+    m_defs.clear();
+    m_phis.clear();
+    for (BlockIndex blockIndex = m_data.size(); blockIndex--;) {
+        m_data[blockIndex].m_defs.clear();
+        m_data[blockIndex].m_phis.clear();
+    }
+}
+
+SSACalculator::Variable* SSACalculator::newVariable()
+{
+    return &m_variables.alloc(Variable(m_variables.size()));
+}
+
+SSACalculator::Def* SSACalculator::newDef(Variable* variable, BasicBlock* block, Node* value)
+{
+    Def* def = m_defs.add(Def(variable, block, value));
+    auto result = m_data[block].m_defs.add(variable, def);
+    if (result.isNewEntry)
+        variable->m_blocksWithDefs.append(block);
+    else
+        result.iterator->value = def;
+    return def;
+}
+
+SSACalculator::Def* SSACalculator::nonLocalReachingDef(BasicBlock* block, Variable* variable)
+{
+    return reachingDefAtTail(m_graph.m_dominators->idom(block), variable);
+}
+
+SSACalculator::Def* SSACalculator::reachingDefAtTail(BasicBlock* block, Variable* variable)
+{
+    for (; block; block = m_graph.m_dominators->idom(block)) {
+        if (Def* def = m_data[block].m_defs.get(variable))
+            return def;
+    }
+    return nullptr;
+}
+
+void SSACalculator::dump(PrintStream& out) const
+{
+    out.print("<Variables: [");
+    CommaPrinter comma;
+    for (unsigned i = 0; i < m_variables.size(); ++i) {
+        out.print(comma);
+        m_variables[i].dumpVerbose(out);
+    }
+    out.print("], Defs: [");
+    comma = CommaPrinter();
+    for (Def* def : const_cast<SSACalculator*>(this)->m_defs)
+        out.print(comma, *def);
+    out.print("], Phis: [");
+    comma = CommaPrinter();
+    for (Def* def : const_cast<SSACalculator*>(this)->m_phis)
+        out.print(comma, *def);
+    out.print("], Block data: [");
+    comma = CommaPrinter();
+    for (BlockIndex blockIndex = 0; blockIndex < m_graph.numBlocks(); ++blockIndex) {
+        BasicBlock* block = m_graph.block(blockIndex);
+        if (!block)
+            continue;
+        
+        out.print(comma, *block, "=>(");
+        out.print("Defs: {");
+        CommaPrinter innerComma;
+        for (auto entry : m_data[block].m_defs)
+            out.print(innerComma, *entry.key, "->", *entry.value);
+        out.print("}, Phis: {");
+        innerComma = CommaPrinter();
+        for (Def* def : m_data[block].m_phis)
+            out.print(innerComma, *def);
+        out.print("})");
+    }
+    out.print("]>");
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+