runtime/FunctionRareData.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 FunctionRareData_h
  27 #define FunctionRareData_h
  28
  29 #include "JSCell.h"
  30 #include "ObjectAllocationProfile.h"
  31 #include "Watchpoint.h"
  32
  33 namespace JSC {
  34
  35 class JSGlobalObject;
  36 class LLIntOffsetsExtractor;
  37 namespace DFG {
  38 class SpeculativeJIT;
  39 class JITCompiler;
  40 }
  41
  42 class FunctionRareData : public JSCell {
  43     friend class JIT;
  44     friend class DFG::SpeculativeJIT;
  45     friend class DFG::JITCompiler;
  46     friend class VM;
  47
  48 public:
  49     typedef JSCell Base;
  50     static const unsigned StructureFlags = StructureIsImmortal | Base::StructureFlags;
  51
  52     static FunctionRareData* create(VM&, JSObject* prototype, size_t inlineCapacity);
  53
  54     static const bool needsDestruction = true;
  55     static void destroy(JSCell*);
  56
  57     static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
  58
  59     static void visitChildren(JSCell*, SlotVisitor&);
  60
  61     DECLARE_INFO;
  62
  63     static inline ptrdiff_t offsetOfAllocationProfile()
  64     {
  65         return OBJECT_OFFSETOF(FunctionRareData, m_allocationProfile);
  66     }
  67
  68     ObjectAllocationProfile* allocationProfile()
  69     {
  70         return &m_allocationProfile;
  71     }
  72
  73     Structure* allocationStructure() { return m_allocationProfile.structure(); }
  74
  75     InlineWatchpointSet& allocationProfileWatchpointSet()
  76     {
  77         return m_allocationProfileWatchpoint;
  78     }
  79
  80     void clear(const char* reason);
  81
  82     void initialize(VM&, JSObject* prototype, size_t inlineCapacity);
  83
  84     bool isInitialized() { return !m_allocationProfile.isNull(); }
  85
  86 protected:
  87     FunctionRareData(VM&);
  88     ~FunctionRareData();
  89
  90     void finishCreation(VM&, JSObject* prototype, size_t inlineCapacity);
  91     using Base::finishCreation;
  92
  93 private:
  94
  95     friend class LLIntOffsetsExtractor;
  96
  97     ObjectAllocationProfile m_allocationProfile;
  98     InlineWatchpointSet m_allocationProfileWatchpoint;
  99 };
 100
 101 } // namespace JSC
 102
 103 #endif // FunctionRareData_h