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7adcbafe | 1 | // Copyright (C) 2012-2022 Free Software Foundation, Inc. |
2077db1b CT |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // Under Section 7 of GPL version 3, you are granted additional | |
15 | // permissions described in the GCC Runtime Library Exception, version | |
16 | // 3.1, as published by the Free Software Foundation. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License and | |
19 | // a copy of the GCC Runtime Library Exception along with this program; | |
20 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
21 | // <http://www.gnu.org/licenses/>. | |
22 | ||
23 | /* This is part of the vtable verification runtime library. For more | |
24 | information about this feature, see the comments in libvtv/vtv_rts.cc. */ | |
25 | ||
26 | /* The functions in this file are used to create the libvtv_stubs | |
27 | library, as part of the vtable verification feature. When building | |
28 | a binary without vtable verification, and linking it with a | |
29 | (possibly pre-built third-party) library that was built with | |
30 | verification, it is possible that vtable verification will fail due | |
31 | to incomplete data (rather than due to corrupt vtable pointers). In | |
32 | this case we need to give programmers a way of turning off the | |
33 | vtable verification in their libraries. They can do so by linking | |
34 | with the libvtv_stubs library, which (as you can see) will replace | |
35 | the real verification functions with a set of functions that do | |
36 | nothing (so no more verification failures/aborts). */ | |
37 | ||
38 | #include <cstddef> | |
39 | ||
f7f049fa CT |
40 | /* weak symbols on Windows work differently than on Linux. To be able |
41 | to switch vtv on and off on Windows two dlls are built. One with | |
42 | the sources from libvtv, the other from these stubs. Depending on | |
43 | which dll is placed in the folder of the executable the functions | |
44 | from libvtv or the stubs functions are used. */ | |
45 | #if defined (__CYGWIN__) || defined (__MINGW32__) | |
46 | extern "C" | |
47 | void | |
48 | __VLTChangePermission(int); | |
49 | ||
50 | void | |
51 | __VLTRegisterSet(void**, const void*, std::size_t, std::size_t, | |
52 | void**); | |
53 | ||
54 | void | |
55 | __VLTRegisterPair(void**, const void*, std::size_t, | |
56 | const void*); | |
57 | ||
58 | const void* | |
59 | __VLTVerifyVtablePointer(void**, const void*); | |
60 | ||
61 | void | |
62 | __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t, | |
63 | void**); | |
64 | ||
65 | void | |
66 | __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*, | |
67 | const char*, const char*); | |
68 | ||
69 | const void* | |
70 | __VLTVerifyVtablePointerDebug(void**, const void*, const char*, | |
71 | const char*); | |
72 | #else | |
2077db1b CT |
73 | // Declare as weak for libsupc++, strong definitions are in libvtv. |
74 | #if __GXX_WEAK__ | |
75 | extern "C" | |
76 | void | |
77 | __VLTChangePermission(int) __attribute__((weak)); | |
78 | ||
79 | void | |
80 | __VLTRegisterSet(void**, const void*, std::size_t, std::size_t, | |
81 | void**) __attribute__((weak)); | |
82 | ||
83 | void | |
84 | __VLTRegisterPair(void**, const void*, std::size_t, | |
85 | const void*) __attribute__((weak)); | |
86 | ||
87 | const void* | |
88 | __VLTVerifyVtablePointer(void**, const void*) __attribute__((weak)); | |
89 | ||
90 | void | |
91 | __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t, | |
92 | void**) __attribute__((weak)); | |
93 | ||
94 | void | |
95 | __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*, | |
96 | const char*, const char*) __attribute__((weak)); | |
97 | ||
98 | const void* | |
99 | __VLTVerifyVtablePointerDebug(void**, const void*, const char*, | |
100 | const char*) __attribute__((weak)); | |
101 | #endif | |
f7f049fa | 102 | #endif |
2077db1b CT |
103 | |
104 | // Stub definitions. | |
105 | extern "C" | |
106 | void | |
107 | __VLTChangePermission(int) | |
108 | { } | |
109 | ||
110 | void | |
111 | __VLTRegisterSet(void**, const void*, std::size_t, std::size_t, void**) | |
112 | { } | |
113 | ||
114 | void | |
115 | __VLTRegisterPair(void**, const void*, std::size_t, const void*) | |
116 | { } | |
117 | ||
118 | const void* | |
119 | __VLTVerifyVtablePointer(void**, const void* vtable_ptr) | |
120 | { return vtable_ptr; } | |
121 | ||
122 | void | |
123 | __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t, void**) | |
124 | { } | |
125 | ||
126 | void | |
127 | __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*, | |
128 | const char*, const char*) | |
129 | { } | |
130 | ||
131 | const void* | |
132 | __VLTVerifyVtablePointerDebug(void**, const void* vtable_ptr, const char*, | |
133 | const char*) | |
134 | { return vtable_ptr; } |