JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / bytecode / PolymorphicGetByIdList.h

diff --git a/bytecode/PolymorphicGetByIdList.h b/bytecode/PolymorphicGetByIdList.h
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+/*
+ * 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. 
+ */
+
+#ifndef PolymorphicGetByIdList_h
+#define PolymorphicGetByIdList_h
+
+#if ENABLE(JIT)
+
+#include "CodeOrigin.h"
+#include "MacroAssembler.h"
+#include "Opcode.h"
+#include "Structure.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CodeBlock;
+struct StructureStubInfo;
+
+class GetByIdAccess {
+public:
+    enum AccessType {
+        Invalid,
+        SimpleInline, // This is the patched inline access.
+        SimpleStub, // This is a stub.
+        WatchedStub,
+        Getter,
+        CustomGetter
+    };
+    
+    GetByIdAccess()
+        : m_type(Invalid)
+        , m_chainCount(0)
+    {
+    }
+    
+    GetByIdAccess(
+        VM&, JSCell* owner, AccessType, PassRefPtr<JITStubRoutine>, Structure*,
+        StructureChain* = 0, unsigned chainCount = 0);
+    
+    ~GetByIdAccess();
+    
+    static GetByIdAccess fromStructureStubInfo(StructureStubInfo&);
+    
+    bool isSet() const { return m_type != Invalid; }
+    bool operator!() const { return !isSet(); }
+    
+    AccessType type() const { return m_type; }
+    
+    Structure* structure() const { return m_structure.get(); }
+    
+    StructureChain* chain() const { return m_chain.get(); }
+    unsigned chainCount() const { return m_chainCount; }
+    
+    JITStubRoutine* stubRoutine() const
+    {
+        ASSERT(isSet());
+        return m_stubRoutine.get();
+    }
+    
+    bool doesCalls() const { return type() == Getter || type() == CustomGetter; }
+    bool isWatched() const { return type() == WatchedStub; }
+    bool isSimple() const { return !doesCalls() && !isWatched(); }
+    
+    bool visitWeak(RepatchBuffer&) const;
+
+private:
+    friend class CodeBlock;
+    
+    AccessType m_type;
+    unsigned m_chainCount;
+    WriteBarrier<Structure> m_structure;
+    WriteBarrier<StructureChain> m_chain;
+    RefPtr<JITStubRoutine> m_stubRoutine;
+};
+
+class PolymorphicGetByIdList {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    // Either creates a new polymorphic get list, or returns the one that is already in
+    // place.
+    static PolymorphicGetByIdList* from(StructureStubInfo&);
+    
+    ~PolymorphicGetByIdList();
+    
+    MacroAssemblerCodePtr currentSlowPathTarget(StructureStubInfo& stubInfo) const;
+    
+    void addAccess(const GetByIdAccess&);
+    
+    bool isEmpty() const { return m_list.isEmpty(); }
+    unsigned size() const { return m_list.size(); }
+    bool isFull() const;
+    bool isAlmostFull() const; // True if adding an element would make isFull() true.
+    const GetByIdAccess& at(unsigned i) const { return m_list[i]; }
+    const GetByIdAccess& operator[](unsigned i) const { return m_list[i]; }
+    
+    bool didSelfPatching() const; // Are any of the accesses SimpleInline?
+    
+    bool visitWeak(RepatchBuffer&) const;
+
+private:
+    friend class CodeBlock;
+    
+    PolymorphicGetByIdList(StructureStubInfo&);
+    
+    Vector<GetByIdAccess, 2> m_list;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+
+#endif // PolymorphicGetByIdList_h
+