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1 | // Copyright (C) 2012-2017 Free Software Foundation, Inc. |
---|---|
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 | |
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 |
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 |
102 | #endif |
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; } |
135 |
Warning: That file was not part of the compilation database. It may have many parsing errors.