runtime/DirectArgumentsOffset.h

   1 /*
   2  * Copyright (C) 2015 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 DirectArgumentsOffset_h
  27 #define DirectArgumentsOffset_h
  28
  29 #include "GenericOffset.h"
  30 #include <wtf/PrintStream.h>
  31
  32 namespace JSC {
  33
  34 // This is an offset into the special arguments object, which captures the arguments to a
  35 // function. It only comes into play if the arguments aren't also lifted into the activation.
  36 // If they were then accesses to the arguments would resolve to a ScopeOffset and not a
  37 // DirectArgumentsOffset.
  38 class DirectArgumentsOffset : public GenericOffset<DirectArgumentsOffset> {
  39 public:
  40     DirectArgumentsOffset() { }
  41
  42     explicit DirectArgumentsOffset(unsigned offset)
  43         : GenericOffset(offset)
  44     {
  45     }
  46
  47     void dump(PrintStream&) const;
  48 };
  49
  50 } // namespace JSC
  51
  52 #endif // DirectArgumentsOffset_h
  53