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8345c4a267
We had a few times the need for a data structure that does essentially what C++17's std::string_view does, which is to give an std::string-like interface (only the read-only operations) to an arbitrary character buffer. This patch adapts the files copied from libstdc++ by the previous patch to integrate them with GDB. Here's a summary of the changes: * Remove things related to wstring_view, u16string_view and u32string_view (I don't think we need them, but we can always add them later). * Remove usages of _GLIBCXX_BEGIN_NAMESPACE_VERSION and _GLIBCXX_END_NAMESPACE_VERSION. * Put the code in the gdb namespace. I had to add a few "std::" in front of std type usages. * Change __throw_out_of_range_fmt() for error(). * Make gdb::string_view an alias of std::string_view when building with >= c++17. * Remove a bunch of constexpr, because they are not valid in c++11 (e.g. they are not a single return line). * Use std::common_type<_Tp>::type instead of std::common_type_t<_Tp>, because c++11 doesn't have the later. * Remove the #pragma GCC system_header, since that silences some warnings that we might want to have if we're doing something not correctly. * Remove operator ""sv. It would need a lot of work to make all supported compilers happy, and we can easily live without it. * Remove operator<<. It is implemented using __ostream_insert (a libstdc++ internal). Bringing it in might be possible, but I don't think that would be worth the effort, since we don't really use streams at the moment. * Replace internal libstdc++ asserts ( __glibcxx_assert and __glibcxx_requires_string_len) with gdb_assert. * Remove hash helpers, because they use libstdc++ internal functions. If we need them we always import them later. The string_view class in cli/cli-script.c is removed and its usage replaced with the new gdb::string_view. gdb/ChangeLog: * common/gdb_string_view.h: Remove libstdc++ implementation details, adjust to gdb reality. * common/gdb_string_view.tcc: Likewise. * cli/cli-script.c (struct string_view): Remove. (user_args) <m_args>: Change element type to gdb::string_view. (user_args::insert_args): Adjust.
220 lines
6.5 KiB
C++
220 lines
6.5 KiB
C++
// Components for manipulating non-owning sequences of characters -*- C++ -*-
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// Note: This file has been stolen from the gcc repo
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// (libstdc++-v3/include/experimental/bits/string_view.tcc) and has local
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// modifications.
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// Copyright (C) 2013-2018 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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/** @file experimental/bits/string_view.tcc
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{experimental/string_view}
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*/
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//
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// N3762 basic_string_view library
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//
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#ifndef GDB_STRING_VIEW_TCC
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#define GDB_STRING_VIEW_TCC 1
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namespace gdb
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{
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find(const _CharT* __str, size_type __pos, size_type __n) const noexcept
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{
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gdb_assert (__str != nullptr || __n == 0);
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if (__n == 0)
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return __pos <= this->_M_len ? __pos : npos;
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if (__n <= this->_M_len)
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{
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for (; __pos <= this->_M_len - __n; ++__pos)
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if (traits_type::eq(this->_M_str[__pos], __str[0])
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&& traits_type::compare(this->_M_str + __pos + 1,
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__str + 1, __n - 1) == 0)
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return __pos;
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find(_CharT __c, size_type __pos) const noexcept
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{
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size_type __ret = npos;
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if (__pos < this->_M_len)
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{
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const size_type __n = this->_M_len - __pos;
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const _CharT* __p = traits_type::find(this->_M_str + __pos, __n, __c);
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if (__p)
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__ret = __p - this->_M_str;
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}
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return __ret;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept
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{
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gdb_assert (__str != nullptr || __n == 0);
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if (__n <= this->_M_len)
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{
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__pos = std::min(size_type(this->_M_len - __n), __pos);
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do
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{
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if (traits_type::compare(this->_M_str + __pos, __str, __n) == 0)
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return __pos;
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}
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while (__pos-- > 0);
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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rfind(_CharT __c, size_type __pos) const noexcept
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{
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size_type __size = this->_M_len;
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if (__size > 0)
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{
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if (--__size > __pos)
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__size = __pos;
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for (++__size; __size-- > 0; )
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if (traits_type::eq(this->_M_str[__size], __c))
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return __size;
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_first_of(const _CharT* __str, size_type __pos, size_type __n) const
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{
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gdb_assert (__str != nullptr || __n == 0);
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for (; __n && __pos < this->_M_len; ++__pos)
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{
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const _CharT* __p = traits_type::find(__str, __n,
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this->_M_str[__pos]);
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if (__p)
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return __pos;
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_last_of(const _CharT* __str, size_type __pos, size_type __n) const
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{
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gdb_assert (__str != nullptr || __n == 0);
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size_type __size = this->size();
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if (__size && __n)
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{
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if (--__size > __pos)
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__size = __pos;
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do
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{
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if (traits_type::find(__str, __n, this->_M_str[__size]))
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return __size;
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}
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while (__size-- != 0);
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_first_not_of(const _CharT* __str, size_type __pos, size_type __n) const
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{
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gdb_assert (__str != nullptr || __n == 0);
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for (; __pos < this->_M_len; ++__pos)
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if (!traits_type::find(__str, __n, this->_M_str[__pos]))
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return __pos;
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_first_not_of(_CharT __c, size_type __pos) const noexcept
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{
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for (; __pos < this->_M_len; ++__pos)
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if (!traits_type::eq(this->_M_str[__pos], __c))
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return __pos;
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_last_not_of(const _CharT* __str, size_type __pos, size_type __n) const
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{
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gdb_assert (__str != nullptr || __n == 0);
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size_type __size = this->_M_len;
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if (__size)
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{
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if (--__size > __pos)
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__size = __pos;
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do
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{
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if (!traits_type::find(__str, __n, this->_M_str[__size]))
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return __size;
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}
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while (__size--);
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}
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return npos;
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}
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template<typename _CharT, typename _Traits>
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/*constexpr*/ typename basic_string_view<_CharT, _Traits>::size_type
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basic_string_view<_CharT, _Traits>::
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find_last_not_of(_CharT __c, size_type __pos) const noexcept
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{
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size_type __size = this->_M_len;
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if (__size)
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{
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if (--__size > __pos)
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__size = __pos;
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do
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{
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if (!traits_type::eq(this->_M_str[__size], __c))
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return __size;
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}
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while (__size--);
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}
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return npos;
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}
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} // namespace gdb
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#endif // GDB_STRING_VIEW_TCC
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