JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / jit / PolymorphicCallStubRoutine.h

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+/*
+ * Copyright (C) 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. 
+ */
+
+#ifndef PolymorphicCallStubRoutine_h
+#define PolymorphicCallStubRoutine_h
+
+#if ENABLE(JIT)
+
+#include "CallEdge.h"
+#include "CallVariant.h"
+#include "CodeOrigin.h"
+#include "GCAwareJITStubRoutine.h"
+#include <wtf/FastMalloc.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CallLinkInfo;
+
+class PolymorphicCallNode : public BasicRawSentinelNode<PolymorphicCallNode> {
+    WTF_MAKE_NONCOPYABLE(PolymorphicCallNode);
+public:
+    PolymorphicCallNode(CallLinkInfo* info)
+        : m_callLinkInfo(info)
+    {
+    }
+    
+    ~PolymorphicCallNode();
+    
+    void unlink(RepatchBuffer&);
+
+    bool hasCallLinkInfo(CallLinkInfo* info) { return m_callLinkInfo == info; }
+    void clearCallLinkInfo();
+    
+private:
+    CallLinkInfo* m_callLinkInfo;
+};
+
+class PolymorphicCallCase {
+public:
+    PolymorphicCallCase()
+        : m_codeBlock(nullptr)
+    {
+    }
+    
+    PolymorphicCallCase(CallVariant variant, CodeBlock* codeBlock)
+        : m_variant(variant)
+        , m_codeBlock(codeBlock)
+    {
+    }
+    
+    CallVariant variant() const { return m_variant; }
+    CodeBlock* codeBlock() const { return m_codeBlock; }
+    
+    void dump(PrintStream&) const;
+    
+private:
+    CallVariant m_variant;
+    CodeBlock* m_codeBlock;
+};
+
+class PolymorphicCallStubRoutine : public GCAwareJITStubRoutine {
+public:
+    PolymorphicCallStubRoutine(
+        const MacroAssemblerCodeRef&, VM&, const JSCell* owner,
+        ExecState* callerFrame, CallLinkInfo&, const Vector<PolymorphicCallCase>&,
+        std::unique_ptr<uint32_t[]> fastCounts);
+    
+    virtual ~PolymorphicCallStubRoutine();
+    
+    CallVariantList variants() const;
+    CallEdgeList edges() const;
+
+    void clearCallNodesFor(CallLinkInfo*);
+    
+    bool visitWeak(RepatchBuffer&) override;
+
+protected:
+    virtual void markRequiredObjectsInternal(SlotVisitor&) override;
+
+private:
+    Vector<WriteBarrier<JSCell>, 2> m_variants;
+    std::unique_ptr<uint32_t[]> m_fastCounts;
+    Bag<PolymorphicCallNode> m_callNodes;
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+
+#endif // PolymorphicCallStubRoutine_h
+