1// Copyright 2006-2008 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_CODE_H_
6#define V8_CODE_H_
7
8#include "src/allocation.h"
9#include "src/handles.h"
10#include "src/objects.h"
11
12namespace v8 {
13namespace internal {
14
15
16// Wrapper class for passing expected and actual parameter counts as
17// either registers or immediate values. Used to make sure that the
18// caller provides exactly the expected number of parameters to the
19// callee.
20class ParameterCount BASE_EMBEDDED {
21 public:
22  explicit ParameterCount(Register reg)
23      : reg_(reg), immediate_(0) { }
24  explicit ParameterCount(int immediate)
25      : reg_(no_reg), immediate_(immediate) { }
26  explicit ParameterCount(Handle<JSFunction> f)
27      : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { }
28
29  bool is_reg() const { return !reg_.is(no_reg); }
30  bool is_immediate() const { return !is_reg(); }
31
32  Register reg() const {
33    DCHECK(is_reg());
34    return reg_;
35  }
36  int immediate() const {
37    DCHECK(is_immediate());
38    return immediate_;
39  }
40
41 private:
42  const Register reg_;
43  const int immediate_;
44
45  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
46};
47
48
49} }  // namespace v8::internal
50
51#endif  // V8_CODE_H_
52