Merge 'wip/next' into dev

Change-Id: Iff9ee5e23bb326c4371ec8ed81d56f2f05d680e9

1 files changed, 134 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/b3/B3SwitchValue.h b/Source/JavaScriptCore/b3/B3SwitchValue.h
new file mode 100644
index 000000000..31268fa2b
--- /dev/null
+++ b/Source/JavaScriptCore/b3/B3SwitchValue.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2015-2016 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. 
+ */
+
+#ifndef B3SwitchValue_h
+#define B3SwitchValue_h
+
+#if ENABLE(B3_JIT)
+
+#include "B3ControlValue.h"
+#include "B3SwitchCase.h"
+
+namespace JSC { namespace B3 {
+
+class SwitchValue : public ControlValue {
+public:
+    static bool accepts(Opcode opcode) { return opcode == Switch; }
+
+    ~SwitchValue();
+
+    // numCaseValues() + 1 == numSuccessors().
+    unsigned numCaseValues() const { return m_values.size(); }
+
+    // The successor for this case value is at the same index.
+    int64_t caseValue(unsigned index) const { return m_values[index]; }
+    
+    const Vector<int64_t>& caseValues() const { return m_values; }
+
+    FrequentedBlock fallThrough() const { return successors().last(); }
+    FrequentedBlock& fallThrough() { return successors().last(); }
+
+    unsigned size() const { return numCaseValues(); }
+    SwitchCase at(unsigned index) const
+    {
+        return SwitchCase(caseValue(index), successor(index));
+    }
+    SwitchCase operator[](unsigned index) const
+    {
+        return at(index);
+    }
+
+    class iterator {
+    public:
+        iterator()
+            : m_switch(nullptr)
+            , m_index(0)
+        {
+        }
+
+        iterator(const SwitchValue& switchValue, unsigned index)
+            : m_switch(&switchValue)
+            , m_index(index)
+        {
+        }
+
+        SwitchCase operator*()
+        {
+            return m_switch->at(m_index);
+        }
+
+        iterator& operator++()
+        {
+            m_index++;
+            return *this;
+        }
+
+        bool operator==(const iterator& other) const
+        {
+            ASSERT(m_switch == other.m_switch);
+            return m_index == other.m_index;
+        }
+
+        bool operator!=(const iterator& other) const
+        {
+            return !(*this == other);
+        }
+
+    private:
+        const SwitchValue* m_switch;
+        unsigned m_index;
+    };
+
+    typedef iterator const_iterator;
+
+    iterator begin() const { return iterator(*this, 0); }
+    iterator end() const { return iterator(*this, size()); }
+
+    // This removes the case and reorders things a bit. If you're iterating the cases from 0 to N,
+    // then you can keep iterating after this so long as you revisit this same index (which will now
+    // contain some other case value). This removes the case that was removed.
+    SwitchCase removeCase(unsigned index);
+
+    JS_EXPORT_PRIVATE void appendCase(const SwitchCase&);
+
+protected:
+    void dumpMeta(CommaPrinter&, PrintStream&) const override;
+
+    Value* cloneImpl() const override;
+
+private:
+    friend class Procedure;
+
+    JS_EXPORT_PRIVATE SwitchValue(Origin, Value* child, const FrequentedBlock& fallThrough);
+
+    Vector<int64_t> m_values;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)
+
+#endif // B3SwitchValue_h
+