88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/* Poison symbols at compile time.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_POISON_H
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#define COMMON_POISON_H
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#include "traits.h"
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/* Poison memset of non-POD types. The idea is catching invalid
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initialization of non-POD structs that is easy to be introduced as
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side effect of refactoring. For example, say this:
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struct S { VEC(foo_s) *m_data; };
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is converted to this at some point:
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struct S {
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S() { m_data.reserve (10); }
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std::vector<foo> m_data;
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};
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and old code was initializing S objects like this:
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struct S s;
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memset (&s, 0, sizeof (S)); // whoops, now wipes vector.
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Declaring memset as deleted for non-POD types makes the memset above
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be a compile-time error. */
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/* Helper for SFINAE. True if "T *" is memsettable. I.e., if T is
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either void, or POD. */
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template<typename T>
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struct IsMemsettable
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: gdb::Or<std::is_void<T>,
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std::is_pod<T>>
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{};
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template <typename T,
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typename = gdb::Requires<gdb::Not<IsMemsettable<T>>>>
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void *memset (T *s, int c, size_t n) = delete;
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#if HAVE_IS_TRIVIALLY_COPYABLE
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/* Similarly, poison memcpy and memmove of non trivially-copyable
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types, which is undefined. */
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/* True if "T *" is relocatable. I.e., copyable with memcpy/memmove.
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I.e., T is either trivially copyable, or void. */
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template<typename T>
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struct IsRelocatable
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: gdb::Or<std::is_void<T>,
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std::is_trivially_copyable<T>>
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{};
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/* True if both source and destination are relocatable. */
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template <typename D, typename S>
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using BothAreRelocatable
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= gdb::And<IsRelocatable<D>, IsRelocatable<S>>;
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template <typename D, typename S,
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typename = gdb::Requires<gdb::Not<BothAreRelocatable<D, S>>>>
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void *memcpy (D *dest, const S *src, size_t n) = delete;
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template <typename D, typename S,
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typename = gdb::Requires<gdb::Not<BothAreRelocatable<D, S>>>>
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void *memmove (D *dest, const S *src, size_t n) = delete;
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#endif /* HAVE_IS_TRIVIALLY_COPYABLE */
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#endif /* COMMON_POISON_H */
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