135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
// Copyright (C) 2012-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/* This is part of the vtable verification runtime library. For more
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information about this feature, see the comments in libvtv/vtv_rts.cc. */
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/* The functions in this file are used to create the libvtv_stubs
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library, as part of the vtable verification feature. When building
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a binary without vtable verification, and linking it with a
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(possibly pre-built third-party) library that was built with
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verification, it is possible that vtable verification will fail due
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to incomplete data (rather than due to corrupt vtable pointers). In
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this case we need to give programmers a way of turning off the
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vtable verification in their libraries. They can do so by linking
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with the libvtv_stubs library, which (as you can see) will replace
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the real verification functions with a set of functions that do
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nothing (so no more verification failures/aborts). */
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#include <cstddef>
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/* weak symbols on Windows work differently than on Linux. To be able
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to switch vtv on and off on Windows two dlls are built. One with
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the sources from libvtv, the other from these stubs. Depending on
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which dll is placed in the folder of the executable the functions
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from libvtv or the stubs functions are used. */
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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extern "C"
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void
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__VLTChangePermission(int);
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void
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__VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
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void**);
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void
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__VLTRegisterPair(void**, const void*, std::size_t,
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const void*);
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const void*
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__VLTVerifyVtablePointer(void**, const void*);
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void
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__VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
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void**);
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void
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__VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
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const char*, const char*);
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const void*
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__VLTVerifyVtablePointerDebug(void**, const void*, const char*,
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const char*);
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#else
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// Declare as weak for libsupc++, strong definitions are in libvtv.
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#if __GXX_WEAK__
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extern "C"
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void
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__VLTChangePermission(int) __attribute__((weak));
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void
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__VLTRegisterSet(void**, const void*, std::size_t, std::size_t,
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void**) __attribute__((weak));
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void
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__VLTRegisterPair(void**, const void*, std::size_t,
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const void*) __attribute__((weak));
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const void*
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__VLTVerifyVtablePointer(void**, const void*) __attribute__((weak));
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void
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__VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t,
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void**) __attribute__((weak));
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void
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__VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
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const char*, const char*) __attribute__((weak));
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const void*
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__VLTVerifyVtablePointerDebug(void**, const void*, const char*,
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const char*) __attribute__((weak));
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#endif
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#endif
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// Stub definitions.
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extern "C"
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void
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__VLTChangePermission(int)
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{ }
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void
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__VLTRegisterSet(void**, const void*, std::size_t, std::size_t, void**)
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{ }
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void
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__VLTRegisterPair(void**, const void*, std::size_t, const void*)
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{ }
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const void*
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__VLTVerifyVtablePointer(void**, const void* vtable_ptr)
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{ return vtable_ptr; }
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void
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__VLTRegisterSetDebug(void**, const void*, std::size_t, std::size_t, void**)
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{ }
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void
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__VLTRegisterPairDebug(void**, const void*, std::size_t, const void*,
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const char*, const char*)
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{ }
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const void*
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__VLTVerifyVtablePointerDebug(void**, const void* vtable_ptr, const char*,
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const char*)
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{ return vtable_ptr; }
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