diff options
Diffstat (limited to 'gdbsupport/gdb_string_view.h')
| -rw-r--r-- | gdbsupport/gdb_string_view.h | 563 |
1 files changed, 563 insertions, 0 deletions
diff --git a/gdbsupport/gdb_string_view.h b/gdbsupport/gdb_string_view.h new file mode 100644 index 00000000000..c0ae7a8a2d9 --- /dev/null +++ b/gdbsupport/gdb_string_view.h @@ -0,0 +1,563 @@ +// Components for manipulating non-owning sequences of characters -*- C++ -*- + + +#ifndef COMMON_GDB_STRING_VIEW_H +#define COMMON_GDB_STRING_VIEW_H + +// Note: This file has been stolen from the gcc repo +// (libstdc++-v3/include/experimental/string_view) and has local modifications. + +// Copyright (C) 2013-2020 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +// +// N3762 basic_string_view library +// + + +#if __cplusplus >= 201703L + +#include <string_view> + +namespace gdb { + using string_view = std::string_view; +} /* namespace gdb */ + +#else /* __cplusplus < 201703L */ + +#include <string> +#include <limits> +#include "gdb_assert.h" + +namespace gdb { + + /** + * @class basic_string_view <experimental/string_view> + * @brief A non-owning reference to a string. + * + * @ingroup strings + * @ingroup sequences + * @ingroup experimental + * + * @tparam _CharT Type of character + * @tparam _Traits Traits for character type, defaults to + * char_traits<_CharT>. + * + * A basic_string_view looks like this: + * + * @code + * _CharT* _M_str + * size_t _M_len + * @endcode + */ + template<typename _CharT, typename _Traits = std::char_traits<_CharT>> + class basic_string_view + { + public: + + // types + using traits_type = _Traits; + using value_type = _CharT; + using pointer = const _CharT*; + using const_pointer = const _CharT*; + using reference = const _CharT&; + using const_reference = const _CharT&; + using const_iterator = const _CharT*; + using iterator = const_iterator; + using const_reverse_iterator = std::reverse_iterator<const_iterator>; + using reverse_iterator = const_reverse_iterator; + using size_type = size_t; + using difference_type = ptrdiff_t; + static constexpr size_type npos = size_type(-1); + + // [string.view.cons], construct/copy + + constexpr + basic_string_view() noexcept + : _M_len{0}, _M_str{nullptr} + { } + + constexpr basic_string_view(const basic_string_view&) noexcept = default; + + template<typename _Allocator> + basic_string_view(const std::basic_string<_CharT, _Traits, + _Allocator>& __str) noexcept + : _M_len{__str.length()}, _M_str{__str.data()} + { } + + /*constexpr*/ basic_string_view(const _CharT* __str) + : _M_len{__str == nullptr ? 0 : traits_type::length(__str)}, + _M_str{__str} + { } + + constexpr basic_string_view(const _CharT* __str, size_type __len) + : _M_len{__len}, + _M_str{__str} + { } + + basic_string_view& + operator=(const basic_string_view&) noexcept = default; + + // [string.view.iterators], iterators + + constexpr const_iterator + begin() const noexcept + { return this->_M_str; } + + constexpr const_iterator + end() const noexcept + { return this->_M_str + this->_M_len; } + + constexpr const_iterator + cbegin() const noexcept + { return this->_M_str; } + + constexpr const_iterator + cend() const noexcept + { return this->_M_str + this->_M_len; } + + const_reverse_iterator + rbegin() const noexcept + { return const_reverse_iterator(this->end()); } + + const_reverse_iterator + rend() const noexcept + { return const_reverse_iterator(this->begin()); } + + const_reverse_iterator + crbegin() const noexcept + { return const_reverse_iterator(this->end()); } + + const_reverse_iterator + crend() const noexcept + { return const_reverse_iterator(this->begin()); } + + // [string.view.capacity], capacity + + constexpr size_type + size() const noexcept + { return this->_M_len; } + + constexpr size_type + length() const noexcept + { return _M_len; } + + constexpr size_type + max_size() const noexcept + { + return (npos - sizeof(size_type) - sizeof(void*)) + / sizeof(value_type) / 4; + } + + constexpr bool + empty() const noexcept + { return this->_M_len == 0; } + + // [string.view.access], element access + + constexpr const _CharT& + operator[](size_type __pos) const + { + // TODO: Assert to restore in a way compatible with the constexpr. + // __glibcxx_assert(__pos < this->_M_len); + return *(this->_M_str + __pos); + } + + constexpr const _CharT& + at(size_type __pos) const + { + return __pos < this->_M_len + ? *(this->_M_str + __pos) + : (error (_("basic_string_view::at: __pos " + "(which is %zu) >= this->size() " + "(which is %zu)"), + __pos, this->size()), + *this->_M_str); + } + + constexpr const _CharT& + front() const + { + // TODO: Assert to restore in a way compatible with the constexpr. + // __glibcxx_assert(this->_M_len > 0); + return *this->_M_str; + } + + constexpr const _CharT& + back() const + { + // TODO: Assert to restore in a way compatible with the constexpr. + // __glibcxx_assert(this->_M_len > 0); + return *(this->_M_str + this->_M_len - 1); + } + + constexpr const _CharT* + data() const noexcept + { return this->_M_str; } + + // [string.view.modifiers], modifiers: + + /*constexpr*/ void + remove_prefix(size_type __n) + { + gdb_assert (this->_M_len >= __n); + this->_M_str += __n; + this->_M_len -= __n; + } + + /*constexpr*/ void + remove_suffix(size_type __n) + { this->_M_len -= __n; } + + /*constexpr*/ void + swap(basic_string_view& __sv) noexcept + { + auto __tmp = *this; + *this = __sv; + __sv = __tmp; + } + + + // [string.view.ops], string operations: + + template<typename _Allocator> + explicit operator std::basic_string<_CharT, _Traits, _Allocator>() const + { + return { this->_M_str, this->_M_len }; + } + + template<typename _Allocator = std::allocator<_CharT>> + std::basic_string<_CharT, _Traits, _Allocator> + to_string(const _Allocator& __alloc = _Allocator()) const + { + return { this->_M_str, this->_M_len, __alloc }; + } + + size_type + copy(_CharT* __str, size_type __n, size_type __pos = 0) const + { + gdb_assert (__str != nullptr || __n == 0); + if (__pos > this->_M_len) + error (_("basic_string_view::copy: __pos " + "(which is %zu) > this->size() " + "(which is %zu)"), + __pos, this->size()); + size_type __rlen{std::min(__n, size_type{this->_M_len - __pos})}; + for (auto __begin = this->_M_str + __pos, + __end = __begin + __rlen; __begin != __end;) + *__str++ = *__begin++; + return __rlen; + } + + + // [string.view.ops], string operations: + + /*constexpr*/ basic_string_view + substr(size_type __pos, size_type __n=npos) const + { + return __pos <= this->_M_len + ? basic_string_view{this->_M_str + __pos, + std::min(__n, size_type{this->_M_len - __pos})} + : (error (_("basic_string_view::substr: __pos " + "(which is %zu) > this->size() " + "(which is %zu)"), + __pos, this->size()), basic_string_view{}); + } + + /*constexpr*/ int + compare(basic_string_view __str) const noexcept + { + int __ret = traits_type::compare(this->_M_str, __str._M_str, + std::min(this->_M_len, __str._M_len)); + if (__ret == 0) + __ret = _S_compare(this->_M_len, __str._M_len); + return __ret; + } + + /*constexpr*/ int + compare(size_type __pos1, size_type __n1, basic_string_view __str) const + { return this->substr(__pos1, __n1).compare(__str); } + + /*constexpr*/ int + compare(size_type __pos1, size_type __n1, + basic_string_view __str, size_type __pos2, size_type __n2) const + { return this->substr(__pos1, __n1).compare(__str.substr(__pos2, __n2)); } + + /*constexpr*/ int + compare(const _CharT* __str) const noexcept + { return this->compare(basic_string_view{__str}); } + + /*constexpr*/ int + compare(size_type __pos1, size_type __n1, const _CharT* __str) const + { return this->substr(__pos1, __n1).compare(basic_string_view{__str}); } + + /*constexpr*/ int + compare(size_type __pos1, size_type __n1, + const _CharT* __str, size_type __n2) const + { + return this->substr(__pos1, __n1) + .compare(basic_string_view(__str, __n2)); + } + + /*constexpr*/ size_type + find(basic_string_view __str, size_type __pos = 0) const noexcept + { return this->find(__str._M_str, __pos, __str._M_len); } + + /*constexpr*/ size_type + find(_CharT __c, size_type __pos=0) const noexcept; + + /*constexpr*/ size_type + find(const _CharT* __str, size_type __pos, size_type __n) const noexcept; + + /*constexpr*/ size_type + find(const _CharT* __str, size_type __pos=0) const noexcept + { return this->find(__str, __pos, traits_type::length(__str)); } + + /*constexpr*/ size_type + rfind(basic_string_view __str, size_type __pos = npos) const noexcept + { return this->rfind(__str._M_str, __pos, __str._M_len); } + + /*constexpr*/ size_type + rfind(_CharT __c, size_type __pos = npos) const noexcept; + + /*constexpr*/ size_type + rfind(const _CharT* __str, size_type __pos, size_type __n) const noexcept; + + /*constexpr*/ size_type + rfind(const _CharT* __str, size_type __pos = npos) const noexcept + { return this->rfind(__str, __pos, traits_type::length(__str)); } + + /*constexpr*/ size_type + find_first_of(basic_string_view __str, size_type __pos = 0) const noexcept + { return this->find_first_of(__str._M_str, __pos, __str._M_len); } + + /*constexpr*/ size_type + find_first_of(_CharT __c, size_type __pos = 0) const noexcept + { return this->find(__c, __pos); } + + /*constexpr*/ size_type + find_first_of(const _CharT* __str, size_type __pos, size_type __n) const; + + /*constexpr*/ size_type + find_first_of(const _CharT* __str, size_type __pos = 0) const noexcept + { return this->find_first_of(__str, __pos, traits_type::length(__str)); } + + /*constexpr*/ size_type + find_last_of(basic_string_view __str, + size_type __pos = npos) const noexcept + { return this->find_last_of(__str._M_str, __pos, __str._M_len); } + + size_type + find_last_of(_CharT __c, size_type __pos=npos) const noexcept + { return this->rfind(__c, __pos); } + + /*constexpr*/ size_type + find_last_of(const _CharT* __str, size_type __pos, size_type __n) const; + + /*constexpr*/ size_type + find_last_of(const _CharT* __str, size_type __pos = npos) const noexcept + { return this->find_last_of(__str, __pos, traits_type::length(__str)); } + + /*constexpr*/ size_type + find_first_not_of(basic_string_view __str, + size_type __pos = 0) const noexcept + { return this->find_first_not_of(__str._M_str, __pos, __str._M_len); } + + /*constexpr*/ size_type + find_first_not_of(_CharT __c, size_type __pos = 0) const noexcept; + + /*constexpr*/ size_type + find_first_not_of(const _CharT* __str, + size_type __pos, size_type __n) const; + + /*constexpr*/ size_type + find_first_not_of(const _CharT* __str, size_type __pos = 0) const noexcept + { + return this->find_first_not_of(__str, __pos, + traits_type::length(__str)); + } + + /*constexpr*/ size_type + find_last_not_of(basic_string_view __str, + size_type __pos = npos) const noexcept + { return this->find_last_not_of(__str._M_str, __pos, __str._M_len); } + + /*constexpr*/ size_type + find_last_not_of(_CharT __c, size_type __pos = npos) const noexcept; + + /*constexpr*/ size_type + find_last_not_of(const _CharT* __str, + size_type __pos, size_type __n) const; + + /*constexpr*/ size_type + find_last_not_of(const _CharT* __str, + size_type __pos = npos) const noexcept + { + return this->find_last_not_of(__str, __pos, + traits_type::length(__str)); + } + + private: + + static constexpr int + _S_compare(size_type __n1, size_type __n2) noexcept + { + return difference_type(__n1 - __n2) > std::numeric_limits<int>::max() + ? std::numeric_limits<int>::max() + : difference_type(__n1 - __n2) < std::numeric_limits<int>::min() + ? std::numeric_limits<int>::min() + : static_cast<int>(difference_type(__n1 - __n2)); + } + + size_t _M_len; + const _CharT* _M_str; + }; + + // [string.view.comparison], non-member basic_string_view comparison functions + + namespace __detail + { + // Identity transform to create a non-deduced context, so that only one + // argument participates in template argument deduction and the other + // argument gets implicitly converted to the deduced type. See n3766.html. + template<typename _Tp> + using __idt = typename std::common_type<_Tp>::type; + } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator==(basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.size() == __y.size() && __x.compare(__y) == 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator==(basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return __x.size() == __y.size() && __x.compare(__y) == 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.size() == __y.size() && __x.compare(__y) == 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator!=(basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return !(__x == __y); } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator!=(basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return !(__x == __y); } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator!=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return !(__x == __y); } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator< (basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) < 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator< (basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return __x.compare(__y) < 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator< (__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) < 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator> (basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) > 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator> (basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return __x.compare(__y) > 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator> (__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) > 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator<=(basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) <= 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator<=(basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return __x.compare(__y) <= 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator<=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) <= 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator>=(basic_string_view<_CharT, _Traits> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) >= 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator>=(basic_string_view<_CharT, _Traits> __x, + __detail::__idt<basic_string_view<_CharT, _Traits>> __y) noexcept + { return __x.compare(__y) >= 0; } + + template<typename _CharT, typename _Traits> + /*constexpr*/ bool + operator>=(__detail::__idt<basic_string_view<_CharT, _Traits>> __x, + basic_string_view<_CharT, _Traits> __y) noexcept + { return __x.compare(__y) >= 0; } + + // basic_string_view typedef names + + using string_view = basic_string_view<char>; +} /* namespace gdb */ + +#include "gdb_string_view.tcc" + +#endif // __cplusplus < 201703L + +#endif /* COMMON_GDB_STRING_VIEW_H */ |