1// Methods for type_info for -*- C++ -*- Run Time Type Identification.
2
3// Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002
4// Free Software Foundation
5//
6// This file is part of GCC.
7//
8// GCC is free software; you can redistribute it and/or modify
9// it under the terms of the GNU General Public License as published by
10// the Free Software Foundation; either version 2, or (at your option)
11// any later version.
12
13// GCC is distributed in the hope that it will be useful,
14// but WITHOUT ANY WARRANTY; without even the implied warranty of
15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16// GNU General Public License for more details.
17
18// You should have received a copy of the GNU General Public License
19// along with GCC; see the file COPYING.  If not, write to
20// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21// Boston, MA 02110-1301, USA.
22
23// As a special exception, you may use this file as part of a free software
24// library without restriction.  Specifically, if other files instantiate
25// templates or use macros or inline functions from this file, or you compile
26// this file and link it with other files to produce an executable, this
27// file does not by itself cause the resulting executable to be covered by
28// the GNU General Public License.  This exception does not however
29// invalidate any other reasons why the executable file might be covered by
30// the GNU General Public License.
31
32#include <cstddef>
33#include "tinfo.h"
34#include "new"			// for placement new
35
36// We can't rely on having stdlib.h if we're freestanding.
37extern "C" void abort ();
38
39using std::type_info;
40
41#if !__GXX_MERGED_TYPEINFO_NAMES
42
43bool
44type_info::before (const type_info &arg) const
45{
46  return __builtin_strcmp (name (), arg.name ()) < 0;
47}
48
49#endif
50
51#include <cxxabi.h>
52
53namespace __cxxabiv1 {
54
55using namespace std;
56
57// This has special meaning to the compiler, and will cause it
58// to emit the type_info structures for the fundamental types which are
59// mandated to exist in the runtime.
60__fundamental_type_info::
61~__fundamental_type_info ()
62{}
63
64__array_type_info::
65~__array_type_info ()
66{}
67
68__function_type_info::
69~__function_type_info ()
70{}
71
72__enum_type_info::
73~__enum_type_info ()
74{}
75
76__pbase_type_info::
77~__pbase_type_info ()
78{}
79
80__pointer_type_info::
81~__pointer_type_info ()
82{}
83
84__pointer_to_member_type_info::
85~__pointer_to_member_type_info ()
86{}
87
88bool __pointer_type_info::
89__is_pointer_p () const
90{
91  return true;
92}
93
94bool __function_type_info::
95__is_function_p () const
96{
97  return true;
98}
99
100bool __pbase_type_info::
101__do_catch (const type_info *thr_type,
102            void **thr_obj,
103            unsigned outer) const
104{
105  if (*this == *thr_type)
106    return true;      // same type
107  if (typeid (*this) != typeid (*thr_type))
108    return false;     // not both same kind of pointers
109
110  if (!(outer & 1))
111    // We're not the same and our outer pointers are not all const qualified
112    // Therefore there must at least be a qualification conversion involved
113    // But for that to be valid, our outer pointers must be const qualified.
114    return false;
115
116  const __pbase_type_info *thrown_type =
117    static_cast <const __pbase_type_info *> (thr_type);
118
119  if (thrown_type->__flags & ~__flags)
120    // We're less qualified.
121    return false;
122
123  if (!(__flags & __const_mask))
124    outer &= ~1;
125
126  return __pointer_catch (thrown_type, thr_obj, outer);
127}
128
129inline bool __pbase_type_info::
130__pointer_catch (const __pbase_type_info *thrown_type,
131                 void **thr_obj,
132                 unsigned outer) const
133{
134  return __pointee->__do_catch (thrown_type->__pointee, thr_obj, outer + 2);
135}
136
137bool __pointer_type_info::
138__pointer_catch (const __pbase_type_info *thrown_type,
139                 void **thr_obj,
140                 unsigned outer) const
141{
142  if (outer < 2 && *__pointee == typeid (void))
143    {
144      // conversion to void
145      return !thrown_type->__pointee->__is_function_p ();
146    }
147
148  return __pbase_type_info::__pointer_catch (thrown_type, thr_obj, outer);
149}
150
151bool __pointer_to_member_type_info::
152__pointer_catch (const __pbase_type_info *thr_type,
153                 void **thr_obj,
154                 unsigned outer) const
155{
156  // This static cast is always valid, as our caller will have determined that
157  // thr_type is really a __pointer_to_member_type_info.
158  const __pointer_to_member_type_info *thrown_type =
159    static_cast <const __pointer_to_member_type_info *> (thr_type);
160
161  if (*__context != *thrown_type->__context)
162    return false;     // not pointers to member of same class
163
164  return __pbase_type_info::__pointer_catch (thrown_type, thr_obj, outer);
165}
166
167} // namespace std
168