bytecode/CallLinkStatus.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 CallLinkStatus_h
  27 #define CallLinkStatus_h
  28
  29 namespace JSC {
  30
  31 class JSFunction;
  32 class CodeBlock;
  33
  34 class CallLinkStatus {
  35 public:
  36     CallLinkStatus()
  37         : m_callTarget(0)
  38         , m_couldTakeSlowPath(false)
  39     {
  40     }
  41
  42     CallLinkStatus(JSFunction* callTarget, bool couldTakeSlowPath)
  43         : m_callTarget(callTarget)
  44         , m_couldTakeSlowPath(couldTakeSlowPath)
  45     {
  46     }
  47
  48     static CallLinkStatus computeFor(CodeBlock*, unsigned bytecodeIndex);
  49
  50     bool isSet() const { return !!m_callTarget || m_couldTakeSlowPath; }
  51
  52     bool operator!() const { return !isSet(); }
  53
  54     bool couldTakeSlowPath() const { return m_couldTakeSlowPath; }
  55
  56     JSFunction* callTarget() const { return m_callTarget; }
  57
  58 private:
  59     static CallLinkStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex);
  60
  61     JSFunction* m_callTarget;
  62     bool m_couldTakeSlowPath;
  63 };
  64
  65 } // namespace JSC
  66
  67 #endif // CallLinkStatus_h
  68