451 lines
15 KiB
C++
451 lines
15 KiB
C++
// Methods for Exception Support for -*- C++ -*-
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// Copyright (C) 2014-2017 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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//
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// ISO C++ 14882: 19.1 Exception classes
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//
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// Enable hooks for support for the Transactional Memory TS (N4514).
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#define _GLIBCXX_TM_TS_INTERNAL
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void
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_txnal_cow_string_C1_for_exceptions(void* that, const char* s, void* exc);
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const char*
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_txnal_cow_string_c_str(const void* that);
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void
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_txnal_cow_string_D1(void* that);
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void
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_txnal_cow_string_D1_commit(void* that);
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void*
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_txnal_logic_error_get_msg(void* e);
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void*
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_txnal_runtime_error_get_msg(void* e);
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// All exception classes still use the classic COW std::string.
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#define _GLIBCXX_USE_CXX11_ABI 0
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#define _GLIBCXX_DEFINE_STDEXCEPT_COPY_OPS 1
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#define __cow_string __cow_stringxxx
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#include <stdexcept>
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#include <system_error>
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#undef __cow_string
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Copy constructors and assignment operators defined using COW std::string
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logic_error::logic_error(const logic_error& e) noexcept
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: _M_msg(e._M_msg) { }
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logic_error& logic_error::operator=(const logic_error& e) noexcept
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{ _M_msg = e._M_msg; return *this; }
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runtime_error::runtime_error(const runtime_error& e) noexcept
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: _M_msg(e._M_msg) { }
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runtime_error&
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runtime_error::operator=(const runtime_error& e) noexcept
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{ _M_msg = e._M_msg; return *this; }
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// New C++11 constructors:
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logic_error::logic_error(const char* __arg)
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: exception(), _M_msg(__arg) { }
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domain_error::domain_error(const char* __arg)
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: logic_error(__arg) { }
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invalid_argument::invalid_argument(const char* __arg)
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: logic_error(__arg) { }
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length_error::length_error(const char* __arg)
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: logic_error(__arg) { }
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out_of_range::out_of_range(const char* __arg)
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: logic_error(__arg) { }
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runtime_error::runtime_error(const char* __arg)
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: exception(), _M_msg(__arg) { }
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range_error::range_error(const char* __arg)
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: runtime_error(__arg) { }
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overflow_error::overflow_error(const char* __arg)
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: runtime_error(__arg) { }
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underflow_error::underflow_error(const char* __arg)
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: runtime_error(__arg) { }
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#if _GLIBCXX_USE_DUAL_ABI
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// Converting constructor from COW std::string to SSO string.
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__sso_string::__sso_string(const string& s)
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: __sso_string(s.c_str(), s.length()) { }
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// Redefine __cow_string so that we can define and export its members
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// in terms of the COW std::string.
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struct __cow_string
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{
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union {
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const char* _M_p;
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char _M_bytes[sizeof(_M_p)];
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std::string _M_str;
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};
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__cow_string();
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__cow_string(const std::string& s);
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__cow_string(const char*, size_t n);
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__cow_string(const __cow_string&) noexcept;
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__cow_string& operator=(const __cow_string&) noexcept;
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~__cow_string();
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__cow_string(__cow_string&&) noexcept;
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__cow_string& operator=(__cow_string&&) noexcept;
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};
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__cow_string::__cow_string() : _M_str() { }
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__cow_string::__cow_string(const std::string& s) : _M_str(s) { }
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__cow_string::__cow_string(const char* s, size_t n) : _M_str(s, n) { }
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__cow_string::__cow_string(const __cow_string& s) noexcept
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: _M_str(s._M_str) { }
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__cow_string&
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__cow_string::operator=(const __cow_string& s) noexcept
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{
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_M_str = s._M_str;
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return *this;
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}
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__cow_string::~__cow_string() { _M_str.~basic_string(); }
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__cow_string::__cow_string(__cow_string&& s) noexcept
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: _M_str(std::move(s._M_str)) { }
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__cow_string&
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__cow_string::operator=(__cow_string&& s) noexcept
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{
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_M_str = std::move(s._M_str);
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return *this;
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}
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static_assert(sizeof(__cow_string) == sizeof(std::string),
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"sizeof(std::string) has changed");
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static_assert(alignof(__cow_string) == alignof(std::string),
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"alignof(std::string) has changed");
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#endif
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// Return error_category::message() as an SSO string
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__sso_string
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error_category::_M_message(int i) const
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{
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string msg = this->message(i);
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return {msg.c_str(), msg.length()};
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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// Support for the Transactional Memory TS (N4514).
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//
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// logic_error and runtime_error both carry a message in the form of a COW
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// string. This COW string is never made visible to users of the exception
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// because what() returns a C string. The COW string can be constructed as
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// either a copy of a COW string of another logic_error/runtime_error, or
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// using a C string or SSO string; thus, the COW string's _Rep is only
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// accessed by logic_error operations. We control all txnal clones of those
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// operations and thus can ensure that _Rep is never accessed transactionally.
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// Furthermore, _Rep will always have been allocated or deallocated via
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// global new or delete, so nontransactional writes we do to _Rep cannot
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// interfere with transactional accesses.
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// We depend on having support for referencing functions declared weak that
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// are not defined by us. Without such support, the exceptions will not be
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// declared transaction-safe, so we just don't provide transactional clones
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// in this case.
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#if _GLIBCXX_USE_WEAK_REF
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extern "C" {
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#ifndef _GLIBCXX_MANGLE_SIZE_T
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#error Mangled name of size_t type not defined.
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#endif
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#define CONCAT1(x,y) x##y
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#define CONCAT(x,y) CONCAT1(x,y)
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#define _ZGTtnaX CONCAT(_ZGTtna,_GLIBCXX_MANGLE_SIZE_T)
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#ifdef __i386__
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/* Only for 32-bit x86. */
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# define ITM_REGPARM __attribute__((regparm(2)))
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#else
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# define ITM_REGPARM
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#endif
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// Declare all libitm symbols we rely on, but make them weak so that we do
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// not depend on libitm.
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extern void* _ZGTtnaX (size_t sz) __attribute__((weak));
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extern void _ZGTtdlPv (void* ptr) __attribute__((weak));
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extern uint8_t _ITM_RU1(const uint8_t *p)
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ITM_REGPARM __attribute__((weak));
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extern uint16_t _ITM_RU2(const uint16_t *p)
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ITM_REGPARM __attribute__((weak));
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extern uint32_t _ITM_RU4(const uint32_t *p)
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ITM_REGPARM __attribute__((weak));
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extern uint64_t _ITM_RU8(const uint64_t *p)
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ITM_REGPARM __attribute__((weak));
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extern void _ITM_memcpyRtWn(void *, const void *, size_t)
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ITM_REGPARM __attribute__((weak));
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extern void _ITM_memcpyRnWt(void *, const void *, size_t)
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ITM_REGPARM __attribute__((weak));
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extern void _ITM_addUserCommitAction(void (*)(void *), uint64_t, void *)
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ITM_REGPARM __attribute__((weak));
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}
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// A transactional version of basic_string::basic_string(const char *s)
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// that also notifies the TM runtime about allocations belonging to this
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// exception.
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void
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_txnal_cow_string_C1_for_exceptions(void* that, const char* s,
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void *exc __attribute__((unused)))
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{
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typedef std::basic_string<char> bs_type;
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bs_type *bs = (bs_type*) that;
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// First, do a transactional strlen, but including the trailing zero.
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bs_type::size_type len = 1;
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for (const char *ss = s; _ITM_RU1((const uint8_t*) ss) != 0; ss++, len++);
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// Allocate memory for the string and the refcount. We use the
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// transactional clone of global new[]; if this throws, it will do so in a
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// transaction-compatible way.
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// The allocation belongs to this exception, so tell the runtime about it.
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// TODO Once this is supported, link the following allocation to this
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// exception: void *prev = _ITM_setAssociatedException(exc);
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bs_type::_Rep *rep;
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__try
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{
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rep = (bs_type::_Rep*) _ZGTtnaX (len + sizeof (bs_type::_Rep));
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}
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__catch (...)
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{
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// Pop the association with this exception.
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// TODO Once this is supported, link the following allocation to this
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// exception: _ITM_setAssociatedException(prev);
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// We do not need to instrument a rethrow.
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__throw_exception_again;
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}
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// Pop the association with this exception.
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// TODO Once this is supported, link the following allocation to this
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// exception: _ITM_setAssociatedException(prev);
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// Now initialize the rest of the string and copy the C string. The memory
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// will be freshly allocated, so nontransactional accesses are sufficient,
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// including the writes when copying the string (see above).
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rep->_M_set_sharable();
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rep->_M_length = rep->_M_capacity = len - 1;
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_ITM_memcpyRtWn(rep->_M_refdata(), s, len);
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new (&bs->_M_dataplus) bs_type::_Alloc_hider(rep->_M_refdata(),
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bs_type::allocator_type());
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}
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static void* txnal_read_ptr(void* const * ptr)
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{
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#if defined(__LCC__) && defined(__e2k__) && defined(__ptr128__)
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__builtin_abort();
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#else // defined(__LCC__) && defined(__e2k__) && defined(__ptr128__)
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static_assert(sizeof(uint64_t) == sizeof(void*)
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|| sizeof(uint32_t) == sizeof(void*)
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|| sizeof(uint16_t) == sizeof(void*),
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"Pointers must be 16 bits, 32 bits or 64 bits wide");
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#if __UINTPTR_MAX__ == __UINT64_MAX__
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return (void*)_ITM_RU8((const uint64_t*)ptr);
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#elif __UINTPTR_MAX__ == __UINT32_MAX__
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return (void*)_ITM_RU4((const uint32_t*)ptr);
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#else
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return (void*)_ITM_RU2((const uint16_t*)ptr);
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#endif
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#endif // defined(__LCC__) && defined(__e2k__) && defined(__ptr128__)
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}
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// We must access the data pointer in the COW string transactionally because
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// another transaction can delete the string and reuse the memory.
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const char*
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_txnal_cow_string_c_str(const void* that)
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{
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typedef std::basic_string<char> bs_type;
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const bs_type *bs = (const bs_type*) that;
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return (const char*) txnal_read_ptr((void**)&bs->_M_dataplus._M_p);
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}
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#if _GLIBCXX_USE_DUAL_ABI
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const char*
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_txnal_sso_string_c_str(const void* that)
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{
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return (const char*) txnal_read_ptr(
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(void* const*)const_cast<char* const*>(
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&((const std::__sso_string*) that)->_M_s._M_p));
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}
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#endif
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void
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_txnal_cow_string_D1_commit(void* data)
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{
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typedef std::basic_string<char> bs_type;
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bs_type::_Rep *rep = (bs_type::_Rep*) data;
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rep->_M_dispose(bs_type::allocator_type());
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}
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void
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_txnal_cow_string_D1(void* that)
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{
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typedef std::basic_string<char> bs_type;
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bs_type::_Rep *rep = reinterpret_cast<bs_type::_Rep*>(
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const_cast<char*>(_txnal_cow_string_c_str(that))) - 1;
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// The string can be shared, in which case we would need to decrement the
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// reference count. We cannot undo that because we might lose the string
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// otherwise. Therefore, we register a commit action that will dispose of
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// the string's _Rep.
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enum {_ITM_noTransactionId = 1};
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_ITM_addUserCommitAction(_txnal_cow_string_D1_commit, _ITM_noTransactionId,
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rep);
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}
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void*
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_txnal_logic_error_get_msg(void* e)
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{
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std::logic_error* le = (std::logic_error*) e;
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return &le->_M_msg;
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}
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void*
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_txnal_runtime_error_get_msg(void* e)
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{
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std::runtime_error* le = (std::runtime_error*) e;
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return &le->_M_msg;
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}
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// The constructors are only declared transaction-safe if the C++11 ABI is
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// used for std::string and the exception classes use a COW string internally.
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// A user must not call these constructors otherwise; if they do, it will
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// result in undefined behavior, which is in this case not initializing this
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// string.
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#if _GLIBCXX_USE_DUAL_ABI
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#define CTORS_FROM_SSOSTRING(NAME, CLASS, BASE) \
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void \
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_ZGTtNSt##NAME##C1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE( \
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CLASS* that, const std::__sso_string& s) \
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{ \
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CLASS e(""); \
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_ITM_memcpyRnWt(that, &e, sizeof(CLASS)); \
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/* Get the C string from the SSO string. */ \
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_txnal_cow_string_C1_for_exceptions(_txnal_##BASE##_get_msg(that), \
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_txnal_sso_string_c_str(&s), that); \
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} \
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void \
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_ZGTtNSt##NAME##C2ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE( \
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CLASS*, const std::__sso_string&) __attribute__((alias \
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("_ZGTtNSt" #NAME \
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"C1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE")));
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#else
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#define CTORS_FROM_SSOSTRING(NAME, CLASS, BASE)
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#endif
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// This macro defines transaction constructors and destructors for a specific
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// exception class. NAME is the variable part of the mangled name, CLASS is
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// the class name, and BASE must be logic_error or runtime_error (which is
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// then used to call the proper friend function that can return a pointer to
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// the _M_msg member declared by the given (base) class).
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#define CTORDTOR(NAME, CLASS, BASE) \
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void \
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_ZGTtNSt##NAME##C1EPKc (CLASS* that, const char* s) \
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{ \
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/* This will use the singleton _Rep for an empty string and just \
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point to it instead of allocating memory. Thus, we can use it as \
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source, copy it into the object we are constructing, and then \
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construct the COW string in the latter manually. Note that the \
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exception classes will not be declared transaction_safe if the \
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shared empty _Rep is disabled with --enable-fully-dynamic-string \
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(in which case _GLIBCXX_FULLY_DYNAMIC_STRING is nonzero). */ \
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CLASS e(""); \
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_ITM_memcpyRnWt(that, &e, sizeof(CLASS)); \
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_txnal_cow_string_C1_for_exceptions(_txnal_##BASE##_get_msg(that), \
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s, that); \
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} \
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void \
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_ZGTtNSt##NAME##C2EPKc (CLASS*, const char*) \
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__attribute__((alias ("_ZGTtNSt" #NAME "C1EPKc"))); \
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CTORS_FROM_SSOSTRING(NAME, CLASS, BASE) \
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void \
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_ZGTtNSt##NAME##D1Ev(CLASS* that) \
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{ _txnal_cow_string_D1(_txnal_##BASE##_get_msg(that)); } \
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void \
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_ZGTtNSt##NAME##D2Ev(CLASS*) \
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__attribute__((alias ("_ZGTtNSt" #NAME "D1Ev"))); \
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void \
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_ZGTtNSt##NAME##D0Ev(CLASS* that) \
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{ \
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_ZGTtNSt##NAME##D1Ev(that); \
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_ZGTtdlPv(that); \
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}
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// Now create all transactional constructors and destructors, as well as the
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// two virtual what() functions.
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extern "C" {
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CTORDTOR(11logic_error, std::logic_error, logic_error)
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const char*
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_ZGTtNKSt11logic_error4whatEv(const std::logic_error* that)
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{
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return _txnal_cow_string_c_str(_txnal_logic_error_get_msg(
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const_cast<std::logic_error*>(that)));
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}
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CTORDTOR(12domain_error, std::domain_error, logic_error)
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CTORDTOR(16invalid_argument, std::invalid_argument, logic_error)
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CTORDTOR(12length_error, std::length_error, logic_error)
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CTORDTOR(12out_of_range, std::out_of_range, logic_error)
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CTORDTOR(13runtime_error, std::runtime_error, runtime_error)
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const char*
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_ZGTtNKSt13runtime_error4whatEv(const std::runtime_error* that)
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{
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return _txnal_cow_string_c_str(_txnal_runtime_error_get_msg(
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const_cast<std::runtime_error*>(that)));
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}
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CTORDTOR(11range_error, std::range_error, runtime_error)
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CTORDTOR(14overflow_error, std::overflow_error, runtime_error)
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CTORDTOR(15underflow_error, std::underflow_error, runtime_error)
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}
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#endif // _GLIBCXX_USE_WEAK_REF
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