runtime/IntendedStructureChain.h

   1 /*
   2  * Copyright (C) 2013, 2014 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 IntendedStructureChain_h
  27 #define IntendedStructureChain_h
  28
  29 #include "Structure.h"
  30 #include <wtf/RefCounted.h>
  31
  32 namespace JSC {
  33
  34 class CodeBlock;
  35 class JSGlobalObject;
  36 class StructureChain;
  37 class VM;
  38 struct DumpContext;
  39
  40 class IntendedStructureChain : public RefCounted<IntendedStructureChain> {
  41 public:
  42     IntendedStructureChain(JSGlobalObject* globalObject, Structure* head);
  43     IntendedStructureChain(CodeBlock* codeBlock, Structure* head, Structure* prototypeStructure);
  44     IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain);
  45     IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain, unsigned count);
  46     ~IntendedStructureChain();
  47
  48     bool isStillValid() const;
  49     bool matches(StructureChain*) const;
  50     StructureChain* chain(VM&) const;
  51     bool mayInterceptStoreTo(VM&, StringImpl* uid);
  52     bool isNormalized();
  53
  54     Structure* head() const { return m_head; }
  55
  56     size_t size() const { return m_vector.size(); }
  57     Structure* at(size_t index) { return m_vector[index]; }
  58     Structure* operator[](size_t index) { return at(index); }
  59
  60     JSObject* terminalPrototype() const;
  61
  62     Structure* last() const { return m_vector.last(); }
  63
  64     void visitChildren(SlotVisitor&);
  65     void dump(PrintStream&) const;
  66     void dumpInContext(PrintStream&, DumpContext*) const;
  67
  68 private:
  69     JSGlobalObject* m_globalObject;
  70     Structure* m_head;
  71     Vector<Structure*> m_vector;
  72 };
  73
  74 } // namespace JSC
  75
  76 #endif // IntendedStructureChain_h