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- // Copyright (C) 2012-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // Under Section 7 of GPL version 3, you are granted additional
- // permissions described in the GCC Runtime Library Exception, version
- // 3.1, as published by the Free Software Foundation.
- // You should have received a copy of the GNU General Public License and
- // a copy of the GCC Runtime Library Exception along with this program;
- // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- // <http://www.gnu.org/licenses/>.
- /* This is part of the vtable verification runtime library. For more
- information about this feature, see the comments in libvtv/vtv_rts.cc. */
- /* The functions in this file are used to create the libvtv_stubs
- library, as part of the vtable verification feature. When building
- a binary without vtable verification, and linking it with a
- (possibly pre-built third-party) library that was built with
- verification, it is possible that vtable verification will fail due
- to incomplete data (rather than due to corrupt vtable pointers). In
- this case we need to give programmers a way of turning off the
- vtable verification in their libraries. They can do so by linking
- with the libvtv_stubs library, which (as you can see) will replace
- the real verification functions with a set of functions that do
- nothing (so no more verification failures/aborts). */
- #include <cstddef>
- /* weak symbols on Windows work differently than on Linux. To be able
- to switch vtv on and off on Windows two dlls are built. One with
- the sources from libvtv, the other from these stubs. Depending on
- which dll is placed in the folder of the executable the functions
- from libvtv or the stubs functions are used. */
- #if defined (__CYGWIN__) || defined (__MINGW32__)
- extern "C"
- void
- __VLTChangePermission(int);
- void
- __VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
- void**);
- void
- __VLTRegisterPair(void**, const void*, std::size_t,
- const void*);
- const void*
- __VLTVerifyVtablePointer(void**, const void*);
- void
- __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
- void**);
- void
- __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
- const char*, const char*);
- const void*
- __VLTVerifyVtablePointerDebug(void**, const void*, const char*,
- const char*);
- #else
- // Declare as weak for libsupc++, strong definitions are in libvtv.
- #if __GXX_WEAK__
- extern "C"
- void
- __VLTChangePermission(int) __attribute__((weak));
- void
- __VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
- void**) __attribute__((weak));
- void
- __VLTRegisterPair(void**, const void*, std::size_t,
- const void*) __attribute__((weak));
- const void*
- __VLTVerifyVtablePointer(void**, const void*) __attribute__((weak));
- void
- __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
- void**) __attribute__((weak));
- void
- __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
- const char*, const char*) __attribute__((weak));
- const void*
- __VLTVerifyVtablePointerDebug(void**, const void*, const char*,
- const char*) __attribute__((weak));
- #endif
- #endif
- // Stub definitions.
- extern "C"
- void
- __VLTChangePermission(int)
- { }
- void
- __VLTRegisterSet(void**, const void*, std::size_t, std::size_t, void**)
- { }
- void
- __VLTRegisterPair(void**, const void*, std::size_t, const void*)
- { }
- const void*
- __VLTVerifyVtablePointer(void**, const void* vtable_ptr)
- { return vtable_ptr; }
- void
- __VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t, void**)
- { }
- void
- __VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
- const char*, const char*)
- { }
- const void*
- __VLTVerifyVtablePointerDebug(void**, const void* vtable_ptr, const char*,
- const char*)
- { return vtable_ptr; }
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