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1 // Copyright (C) 1994-2020 Free Software Foundation, Inc.
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111
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2 //
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3 // This file is part of GCC.
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4 //
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5 // GCC is free software; you can redistribute it and/or modify
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6 // it under the terms of the GNU General Public License as published by
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7 // the Free Software Foundation; either version 3, or (at your option)
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8 // any later version.
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9
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10 // GCC is distributed in the hope that it will be useful,
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11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 // GNU General Public License for more details.
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14
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15 // Under Section 7 of GPL version 3, you are granted additional
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16 // permissions described in the GCC Runtime Library Exception, version
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17 // 3.1, as published by the Free Software Foundation.
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18
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19 // You should have received a copy of the GNU General Public License and
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20 // a copy of the GCC Runtime Library Exception along with this program;
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21 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 // <http://www.gnu.org/licenses/>.
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23
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24 #include "tinfo.h"
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25
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26 namespace __cxxabiv1 {
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27
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28 __pbase_type_info::
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29 ~__pbase_type_info ()
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30 {}
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31
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32 bool __pbase_type_info::
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33 __do_catch (const type_info *thr_type,
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34 void **thr_obj,
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35 unsigned outer) const
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36 {
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37 if (*this == *thr_type)
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38 return true; // same type
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39
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40 #if __cpp_rtti
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41 if (*thr_type == typeid (nullptr))
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42 {
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43 // A catch handler for any pointer type matches nullptr_t.
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44 if (typeid (*this) == typeid(__pointer_type_info))
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45 {
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46 *thr_obj = nullptr;
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47 return true;
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48 }
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49 else if (typeid (*this) == typeid(__pointer_to_member_type_info))
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50 {
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51 if (__pointee->__is_function_p ())
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52 {
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53 using pmf_type = void (__pbase_type_info::*)();
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54 static const pmf_type pmf = nullptr;
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55 *thr_obj = const_cast<pmf_type*>(&pmf);
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56 return true;
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57 }
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58 else
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59 {
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60 using pm_type = int __pbase_type_info::*;
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61 static const pm_type pm = nullptr;
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62 *thr_obj = const_cast<pm_type*>(&pm);
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63 return true;
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64 }
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65 }
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66 }
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67
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68 if (typeid (*this) != typeid (*thr_type))
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69 return false; // not both same kind of pointers
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70 #endif
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71
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72 if (!(outer & 1))
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73 // We're not the same and our outer pointers are not all const qualified
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74 // Therefore there must at least be a qualification conversion involved
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75 // But for that to be valid, our outer pointers must be const qualified.
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76 return false;
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77
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78 const __pbase_type_info *thrown_type =
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79 static_cast <const __pbase_type_info *> (thr_type);
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80
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81 unsigned tflags = thrown_type->__flags;
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82
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83 const unsigned fqual_mask = __transaction_safe_mask|__noexcept_mask;
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84 unsigned throw_fqual = (tflags & fqual_mask);
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85 unsigned catch_fqual = (__flags & fqual_mask);
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86 if (throw_fqual & ~catch_fqual)
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87 /* Catch can perform a function pointer conversion. */
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88 tflags &= catch_fqual;
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89 if (catch_fqual & ~throw_fqual)
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90 /* But not the reverse. */
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91 return false;
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92
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93 if (tflags & ~__flags)
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94 // We're less qualified.
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95 return false;
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96
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97 if (!(__flags & __const_mask))
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98 outer &= ~1;
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99
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100 return __pointer_catch (thrown_type, thr_obj, outer);
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101 }
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102
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103 }
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