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8dfc67d672
Previously there were two ways to override the verbose abort function which gets called when a hardening assertion is triggered: - compile-time: define the `_LIBCPP_VERBOSE_ABORT` macro; - link-time: provide a definition of `__libcpp_verbose_abort` function. This patch adds a new configure-time approach: the vendor can provide a path to a custom header file which will get copied into the build by CMake and included by the library. The header must provide a definition of the `_LIBCPP_ASSERTION_HANDLER` macro which is what will get called should a hardening assertion fail. As of this patch, overriding `_LIBCPP_VERBOSE_ABORT` will still work, but the previous mechanisms will be effectively removed in a follow-up patch, making the configure-time mechanism the sole way of overriding the default handler. Note that `_LIBCPP_ASSERTION_HANDLER` only gets invoked when a hardening assertion fails. It does not affect other cases where `_LIBCPP_VERBOSE_ABORT` is currently used (e.g. when an exception is thrown in the `-fno-exceptions` mode). The library provides a default version of the custom header file that will get used if it's not overridden by the vendor. That allows us to always test the override mechanism and reduces the difference in configuration between the pristine version of the library and a platform-specific version.
38 lines
1.9 KiB
C++
38 lines
1.9 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ASSERT
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#define _LIBCPP___ASSERT
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#include <__assertion_handler> // Note: this include is generated by CMake and is potentially vendor-provided.
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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#define _LIBCPP_ASSERT(expression, message) \
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(__builtin_expect(static_cast<bool>(expression), 1) \
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? (void)0 \
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: _LIBCPP_ASSERTION_HANDLER(__FILE__ ":" _LIBCPP_TOSTRING(__LINE__) ": assertion " _LIBCPP_TOSTRING( \
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expression) " failed: " message "\n"))
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// TODO: __builtin_assume can currently inhibit optimizations. Until this has been fixed and we can add
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// assumptions without a clear optimization intent, disable that to avoid worsening the code generation.
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// See https://discourse.llvm.org/t/llvm-assume-blocks-optimization/71609 for a discussion.
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#if 0 && __has_builtin(__builtin_assume)
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# define _LIBCPP_ASSUME(expression) \
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(_LIBCPP_DIAGNOSTIC_PUSH _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wassume") \
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__builtin_assume(static_cast<bool>(expression)) _LIBCPP_DIAGNOSTIC_POP)
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#else
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# define _LIBCPP_ASSUME(expression) ((void)0)
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#endif
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#endif // _LIBCPP___ASSERT
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