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
  31 namespace JSC {
  32
  33 class VM;
  34 class ExecState;
  35 struct Instruction;
  36
  37 class AbstractPC {
  38 public:
  39     AbstractPC()
  40         : m_pointer(0)
  41         , m_mode(None)
  42     {
  43     }
  44
  45     AbstractPC(VM&, ExecState*);
  46
  47 #if ENABLE(JIT)
  48     AbstractPC(ReturnAddressPtr ptr)
  49         : m_pointer(ptr.value())
  50         , m_mode(JIT)
  51     {
  52     }
  53
  54     bool hasJITReturnAddress() const { return m_mode == JIT; }
  55     ReturnAddressPtr jitReturnAddress() const
  56     {
  57         ASSERT(hasJITReturnAddress());
  58         return ReturnAddressPtr(m_pointer);
  59     }
  60 #endif
  61
  62     bool isSet() const { return m_mode != None; }
  63     bool operator!() const { return !isSet(); }
  64
  65 private:
  66     void* m_pointer;
  67
  68     enum Mode { None, JIT, Interpreter };
  69     Mode m_mode;
  70 };
  71
  72 } // namespace JSC
  73
  74 #endif // AbstractPC_h
  75