interpreter/VMEntryRecord.h

   1 /*
   2  * Copyright (C) 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 VMEntryRecord_h
  27 #define VMEntryRecord_h
  28
  29 namespace JSC {
  30
  31 typedef void VMEntryFrame;
  32
  33 class ExecState;
  34 class VM;
  35
  36 struct VMEntryRecord {
  37     /*
  38      * This record stored in a vmEntryTo{JavaScript,Host} allocated frame. It is allocated on the stack
  39      * after callee save registers where local variables would go.
  40      */
  41     VM* m_vm;
  42     ExecState* m_prevTopCallFrame;
  43     VMEntryFrame* m_prevTopVMEntryFrame;
  44
  45     ExecState* prevTopCallFrame() { return m_prevTopCallFrame; }
  46
  47     VMEntryFrame* prevTopVMEntryFrame() { return m_prevTopVMEntryFrame; }
  48 };
  49
  50 extern "C" VMEntryRecord* vmEntryRecord(VMEntryFrame*);
  51
  52 } // namespace JSC
  53
  54 #endif // VMEntryRecord_h