CSE2410 Fall 2014 Bounce

// Copyright 2006-2008 the V8 project authors. All rights reserved.

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

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//     * Redistributions in binary form must reproduce the above

//       copyright notice, this list of conditions and the following

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//       with the distribution.

//     * Neither the name of Google Inc. nor the names of its

//       contributors may be used to endorse or promote products derived

//       from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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#ifndef V8_CODE_H_

#define V8_CODE_H_

namespace v8 { namespace internal {

// Wrapper class for passing expected and actual parameter counts as

// either registers or immediate values. Used to make sure that the

// caller provides exactly the expected number of parameters to the

// callee.

class ParameterCount BASE_EMBEDDED {

 public:

  explicit ParameterCount(Register reg)

      : reg_(reg), immediate_(0) { }

  explicit ParameterCount(int immediate)

      : reg_(no_reg), immediate_(immediate) { }

  bool is_reg() const { return !reg_.is(no_reg); }

  bool is_immediate() const { return !is_reg(); }

  Register reg() const {

    ASSERT(is_reg());

    return reg_;

  }

  int immediate() const {

    ASSERT(is_immediate());

    return immediate_;

  }

 private:

  const Register reg_;

  const int immediate_;

  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);

};

} }  // namespace v8::internal

#endif  // V8_CODE_H_