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 
12 namespace v8 {
13 namespace 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.
20 class ParameterCount BASE_EMBEDDED {
21  public:
ParameterCount(Register reg)22   explicit ParameterCount(Register reg)
23       : reg_(reg), immediate_(0) { }
ParameterCount(int immediate)24   explicit ParameterCount(int immediate)
25       : reg_(no_reg), immediate_(immediate) { }
ParameterCount(Handle<JSFunction> f)26   explicit ParameterCount(Handle<JSFunction> f)
27       : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { }
28 
is_reg()29   bool is_reg() const { return !reg_.is(no_reg); }
is_immediate()30   bool is_immediate() const { return !is_reg(); }
31 
reg()32   Register reg() const {
33     DCHECK(is_reg());
34     return reg_;
35   }
immediate()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