1// Copyright 2006-2008 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_CODE_H_
29#define V8_CODE_H_
30
31#include "allocation.h"
32#include "handles.h"
33#include "objects.h"
34
35namespace v8 {
36namespace internal {
37
38
39// Wrapper class for passing expected and actual parameter counts as
40// either registers or immediate values. Used to make sure that the
41// caller provides exactly the expected number of parameters to the
42// callee.
43class ParameterCount BASE_EMBEDDED {
44 public:
45  explicit ParameterCount(Register reg)
46      : reg_(reg), immediate_(0) { }
47  explicit ParameterCount(int immediate)
48      : reg_(no_reg), immediate_(immediate) { }
49  explicit ParameterCount(Handle<JSFunction> f)
50      : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { }
51
52  bool is_reg() const { return !reg_.is(no_reg); }
53  bool is_immediate() const { return !is_reg(); }
54
55  Register reg() const {
56    ASSERT(is_reg());
57    return reg_;
58  }
59  int immediate() const {
60    ASSERT(is_immediate());
61    return immediate_;
62  }
63
64 private:
65  const Register reg_;
66  const int immediate_;
67
68  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
69};
70
71
72} }  // namespace v8::internal
73
74#endif  // V8_CODE_H_
75