jit/PolymorphicCallStubRoutine.h

   1 /*
   2  * Copyright (C) 2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef PolymorphicCallStubRoutine_h
  27 #define PolymorphicCallStubRoutine_h
  28
  29 #if ENABLE(JIT)
  30
  31 #include "CallEdge.h"
  32 #include "CallVariant.h"
  33 #include "CodeOrigin.h"
  34 #include "GCAwareJITStubRoutine.h"
  35 #include <wtf/FastMalloc.h>
  36 #include <wtf/Noncopyable.h>
  37 #include <wtf/Vector.h>
  38
  39 namespace JSC {
  40
  41 class CallLinkInfo;
  42
  43 class PolymorphicCallNode : public BasicRawSentinelNode<PolymorphicCallNode> {
  44     WTF_MAKE_NONCOPYABLE(PolymorphicCallNode);
  45 public:
  46     PolymorphicCallNode(CallLinkInfo* info)
  47         : m_callLinkInfo(info)
  48     {
  49     }
  50
  51     ~PolymorphicCallNode();
  52
  53     void unlink(RepatchBuffer&);
  54
  55     bool hasCallLinkInfo(CallLinkInfo* info) { return m_callLinkInfo == info; }
  56     void clearCallLinkInfo();
  57
  58 private:
  59     CallLinkInfo* m_callLinkInfo;
  60 };
  61
  62 class PolymorphicCallCase {
  63 public:
  64     PolymorphicCallCase()
  65         : m_codeBlock(nullptr)
  66     {
  67     }
  68
  69     PolymorphicCallCase(CallVariant variant, CodeBlock* codeBlock)
  70         : m_variant(variant)
  71         , m_codeBlock(codeBlock)
  72     {
  73     }
  74
  75     CallVariant variant() const { return m_variant; }
  76     CodeBlock* codeBlock() const { return m_codeBlock; }
  77
  78     void dump(PrintStream&) const;
  79
  80 private:
  81     CallVariant m_variant;
  82     CodeBlock* m_codeBlock;
  83 };
  84
  85 class PolymorphicCallStubRoutine : public GCAwareJITStubRoutine {
  86 public:
  87     PolymorphicCallStubRoutine(
  88         const MacroAssemblerCodeRef&, VM&, const JSCell* owner,
  89         ExecState* callerFrame, CallLinkInfo&, const Vector<PolymorphicCallCase>&,
  90         std::unique_ptr<uint32_t[]> fastCounts);
  91
  92     virtual ~PolymorphicCallStubRoutine();
  93
  94     CallVariantList variants() const;
  95     CallEdgeList edges() const;
  96
  97     void clearCallNodesFor(CallLinkInfo*);
  98
  99     bool visitWeak(RepatchBuffer&) override;
 100
 101 protected:
 102     virtual void markRequiredObjectsInternal(SlotVisitor&) override;
 103
 104 private:
 105     Vector<WriteBarrier<JSCell>, 2> m_variants;
 106     std::unique_ptr<uint32_t[]> m_fastCounts;
 107     Bag<PolymorphicCallNode> m_callNodes;
 108 };
 109
 110 } // namespace JSC
 111
 112 #endif // ENABLE(JIT)
 113
 114 #endif // PolymorphicCallStubRoutine_h
 115