interpreter/AbstractPC.h

   1 /*
   2  * Copyright (C) 2012 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 AbstractPC_h
  27 #define AbstractPC_h
  28
  29 #include "MacroAssemblerCodeRef.h"
  30 #include <wtf/Platform.h>
  31
  32 namespace JSC {
  33
  34 class JSGlobalData;
  35 class ExecState;
  36 struct Instruction;
  37
  38 class AbstractPC {
  39 public:
  40     AbstractPC()
  41         : m_pointer(0)
  42         , m_mode(None)
  43     {
  44     }
  45
  46     AbstractPC(JSGlobalData&, ExecState*);
  47
  48 #if ENABLE(JIT)
  49     AbstractPC(ReturnAddressPtr ptr)
  50         : m_pointer(ptr.value())
  51         , m_mode(JIT)
  52     {
  53     }
  54
  55     bool hasJITReturnAddress() const { return m_mode == JIT; }
  56     ReturnAddressPtr jitReturnAddress() const
  57     {
  58         ASSERT(hasJITReturnAddress());
  59         return ReturnAddressPtr(m_pointer);
  60     }
  61 #endif
  62
  63 #if ENABLE(CLASSIC_INTERPRETER)
  64     AbstractPC(Instruction* vPC)
  65         : m_pointer(vPC)
  66         , m_mode(Interpreter)
  67     {
  68     }
  69
  70     bool hasInterpreterReturnAddress() const { return m_mode == Interpreter; }
  71     Instruction* interpreterReturnAddress() const
  72     {
  73         ASSERT(hasInterpreterReturnAddress());
  74         return static_cast<Instruction*>(m_pointer);
  75     }
  76 #endif
  77
  78     bool isSet() const { return m_mode != None; }
  79     bool operator!() const { return !isSet(); }
  80
  81 private:
  82     void* m_pointer;
  83
  84     enum Mode { None, JIT, Interpreter };
  85     Mode m_mode;
  86 };
  87
  88 } // namespace JSC
  89
  90 #endif // AbstractPC_h
  91