Copy string_view tests from libstdc++

This patch copies the string_view tests from the gcc repository (commit
02a4441f002c).

  ${gcc}/libstdc++-v3/testsuite/21_strings/basic_string_view ->
    ${binutils-gdb}/gdb/unittests/basic_string_view

The local modifications are done in the following patch, so that it's
easier to review them.

gdb/ChangeLog:

	* unittests/basic_string_view/capacity/1.cc: New file.
	* unittests/basic_string_view/capacity/empty_neg.cc: New file.
	* unittests/basic_string_view/cons/char/1.cc: New file.
	* unittests/basic_string_view/cons/char/2.cc: New file.
	* unittests/basic_string_view/cons/char/3.cc: New file.
	* unittests/basic_string_view/cons/wchar_t/1.cc: New file.
	* unittests/basic_string_view/cons/wchar_t/2.cc: New file.
	* unittests/basic_string_view/cons/wchar_t/3.cc: New file.
	* unittests/basic_string_view/element_access/char/1.cc: New file.
	* unittests/basic_string_view/element_access/char/2.cc: New file.
	* unittests/basic_string_view/element_access/char/empty.cc: New file.
	* unittests/basic_string_view/element_access/char/front_back.cc: New file.
	* unittests/basic_string_view/element_access/wchar_t/1.cc: New file.
	* unittests/basic_string_view/element_access/wchar_t/2.cc: New file.
	* unittests/basic_string_view/element_access/wchar_t/empty.cc: New file.
	* unittests/basic_string_view/element_access/wchar_t/front_back.cc: New file.
	* unittests/basic_string_view/include.cc: New file.
	* unittests/basic_string_view/inserters/char/1.cc: New file.
	* unittests/basic_string_view/inserters/char/2.cc: New file.
	* unittests/basic_string_view/inserters/char/3.cc: New file.
	* unittests/basic_string_view/inserters/pod/10081-out.cc: New file.
	* unittests/basic_string_view/inserters/wchar_t/1.cc: New file.
	* unittests/basic_string_view/inserters/wchar_t/2.cc: New file.
	* unittests/basic_string_view/inserters/wchar_t/3.cc: New file.
	* unittests/basic_string_view/literals/types.cc: New file.
	* unittests/basic_string_view/literals/values.cc: New file.
	* unittests/basic_string_view/modifiers/remove_prefix/char/1.cc: New file.
	* unittests/basic_string_view/modifiers/remove_prefix/wchar_t/1.cc: New file.
	* unittests/basic_string_view/modifiers/remove_suffix/char/1.cc: New file.
	* unittests/basic_string_view/modifiers/remove_suffix/wchar_t/1.cc: New file.
	* unittests/basic_string_view/modifiers/swap/char/1.cc: New file.
	* unittests/basic_string_view/modifiers/swap/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/compare/char/1.cc: New file.
	* unittests/basic_string_view/operations/compare/char/13650.cc: New file.
	* unittests/basic_string_view/operations/compare/char/2.cc: New file.
	* unittests/basic_string_view/operations/compare/char/70483.cc: New file.
	* unittests/basic_string_view/operations/compare/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/compare/wchar_t/13650.cc: New file.
	* unittests/basic_string_view/operations/compare/wchar_t/2.cc: New file.
	* unittests/basic_string_view/operations/copy/char/1.cc: New file.
	* unittests/basic_string_view/operations/copy/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/data/char/1.cc: New file.
	* unittests/basic_string_view/operations/data/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/find/char/1.cc: New file.
	* unittests/basic_string_view/operations/find/char/2.cc: New file.
	* unittests/basic_string_view/operations/find/char/3.cc: New file.
	* unittests/basic_string_view/operations/find/char/4.cc: New file.
	* unittests/basic_string_view/operations/find/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/find/wchar_t/2.cc: New file.
	* unittests/basic_string_view/operations/find/wchar_t/3.cc: New file.
	* unittests/basic_string_view/operations/find/wchar_t/4.cc: New file.
	* unittests/basic_string_view/operations/rfind/char/1.cc: New file.
	* unittests/basic_string_view/operations/rfind/char/2.cc: New file.
	* unittests/basic_string_view/operations/rfind/char/3.cc: New file.
	* unittests/basic_string_view/operations/rfind/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operations/rfind/wchar_t/2.cc: New file.
	* unittests/basic_string_view/operations/rfind/wchar_t/3.cc: New file.
	* unittests/basic_string_view/operations/string_conversion/1.cc: New file.
	* unittests/basic_string_view/operations/substr/char/1.cc: New file.
	* unittests/basic_string_view/operations/substr/wchar_t/1.cc: New file.
	* unittests/basic_string_view/operators/char/2.cc: New file.
	* unittests/basic_string_view/operators/wchar_t/2.cc: New file.
	* unittests/basic_string_view/range_access/char/1.cc: New file.
	* unittests/basic_string_view/range_access/wchar_t/1.cc: New file.
	* unittests/basic_string_view/requirements/explicit_instantiation/1.cc: New file.
	* unittests/basic_string_view/requirements/explicit_instantiation/char/1.cc: New file.
	* unittests/basic_string_view/requirements/explicit_instantiation/char16_t/1.cc: New file.
	* unittests/basic_string_view/requirements/explicit_instantiation/char32_t/1.cc: New file.
	* unittests/basic_string_view/requirements/explicit_instantiation/wchar_t/1.cc: New file.
	* unittests/basic_string_view/requirements/typedefs.cc: New file.
	* unittests/basic_string_view/typedefs.cc: New file.
	* unittests/basic_string_view/types/1.cc: New file.

1 files changed, 161 insertions, 0 deletions

diff --git a/gdb/unittests/basic_string_view/operations/find/wchar_t/2.cc b/gdb/unittests/basic_string_view/operations/find/wchar_t/2.cc
new file mode 100644
index 00000000000..2802bf4442c
--- /dev/null
+++ b/gdb/unittests/basic_string_view/operations/find/wchar_t/2.cc
@@ -0,0 +1,161 @@
+// { dg-options "-std=gnu++17" }
+
+// Copyright (C) 2013-2018 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// basic_string_view find_first_of
+
+#include <string_view>
+#include <testsuite_hooks.h>
+
+void
+test02()
+{
+  typedef std::wstring_view::size_type csize_type;
+  csize_type npos = std::wstring_view::npos;
+  csize_type csz01, csz02;
+
+  const wchar_t str_lit01[] = L"mave";
+  const std::wstring_view str01(L"mavericks, santa cruz");
+  std::wstring_view str02(str_lit01);
+  std::wstring_view str03(L"s, s");
+  std::wstring_view str04;
+
+  // size_type find_first_of(const wstring_view&, size_type pos = 0) const;
+  std::wstring_view str05(L"xena rulez");
+  csz01 = str01.find_first_of(str01);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str01, 4);
+  VERIFY( csz01 == 4 );
+  csz01 = str01.find_first_of(str02, 0);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str02, 3);
+  VERIFY( csz01 == 3 );
+  csz01 = str01.find_first_of(str03, 0);
+  VERIFY( csz01 == 8 );
+  csz01 = str01.find_first_of(str03, 3);
+  VERIFY( csz01 == 8 );
+  csz01 = str01.find_first_of(str03, 12);
+  VERIFY( csz01 == 16 );
+  csz01 = str01.find_first_of(str05, 0);
+  VERIFY( csz01 == 1 );
+  csz01 = str01.find_first_of(str05, 4);
+  VERIFY( csz01 == 4 );
+
+  // An empty string_view consists of no characters
+  // therefore it should be found at every point in a string_view,
+  // except beyond the end
+  // However, str1.find_first_of(str2,pos) finds the first character in
+  // str1 (starting at pos) that exists in str2, which is none for empty str2
+  csz01 = str01.find_first_of(str04, 0);
+  VERIFY( csz01 == npos );
+  csz01 = str01.find_first_of(str04, 5);
+  VERIFY( csz01 == npos );
+
+  // size_type find_first_of(const wchar_t* s, size_type pos, size_type n) const;
+  csz01 = str01.find_first_of(str_lit01, 0, 3);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str_lit01, 3, 0);
+  VERIFY( csz01 == npos );
+
+  // size_type find_first_of(const wchar_t* s, size_type pos = 0) const;
+  csz01 = str01.find_first_of(str_lit01);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str_lit01, 3);
+  VERIFY( csz01 == 3 );
+
+  // size_type find_first_of(wchar_t c, size_type pos = 0) const;
+  csz01 = str01.find_first_of(L'z');
+  csz02 = str01.size() - 1;
+  VERIFY( csz01 == csz02 );
+}
+
+constexpr bool
+test04()
+{
+  typedef std::wstring_view::size_type csize_type;
+  csize_type npos = std::wstring_view::npos;
+  csize_type csz01 = 0, csz02 = 0;
+
+  const wchar_t str_lit01[] = L"mave";
+  const std::wstring_view str01(L"mavericks, santa cruz");
+  std::wstring_view str02(str_lit01);
+  std::wstring_view str03(L"s, s");
+  std::wstring_view str04;
+
+#undef VERIFY
+#define VERIFY(x) if(!(x)) return false
+
+  // size_type find_first_of(const wstring_view&, size_type pos = 0) const;
+  std::wstring_view str05(L"xena rulez");
+  csz01 = str01.find_first_of(str01);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str01, 4);
+  VERIFY( csz01 == 4 );
+  csz01 = str01.find_first_of(str02, 0);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str02, 3);
+  VERIFY( csz01 == 3 );
+  csz01 = str01.find_first_of(str03, 0);
+  VERIFY( csz01 == 8 );
+  csz01 = str01.find_first_of(str03, 3);
+  VERIFY( csz01 == 8 );
+  csz01 = str01.find_first_of(str03, 12);
+  VERIFY( csz01 == 16 );
+  csz01 = str01.find_first_of(str05, 0);
+  VERIFY( csz01 == 1 );
+  csz01 = str01.find_first_of(str05, 4);
+  VERIFY( csz01 == 4 );
+
+  // An empty string_view consists of no characters
+  // therefore it should be found at every point in a string_view,
+  // except beyond the end
+  // However, str1.find_first_of(str2,pos) finds the first character in
+  // str1 (starting at pos) that exists in str2, which is none for empty str2
+  csz01 = str01.find_first_of(str04, 0);
+  VERIFY( csz01 == npos );
+  csz01 = str01.find_first_of(str04, 5);
+  VERIFY( csz01 == npos );
+
+  // size_type find_first_of(const wchar_t* s, size_type pos, size_type n) const;
+  csz01 = str01.find_first_of(str_lit01, 0, 3);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str_lit01, 3, 0);
+  VERIFY( csz01 == npos );
+
+  // size_type find_first_of(const wchar_t* s, size_type pos = 0) const;
+  csz01 = str01.find_first_of(str_lit01);
+  VERIFY( csz01 == 0 );
+  csz01 = str01.find_first_of(str_lit01, 3);
+  VERIFY( csz01 == 3 );
+
+  // size_type find_first_of(wchar_t c, size_type pos = 0) const;
+  csz01 = str01.find_first_of(L'z');
+  csz02 = str01.size() - 1;
+  VERIFY( csz01 == csz02 );
+
+  return true;
+}
+
+int
+main()
+{
+  test02();
+  static_assert( test04() );
+
+  return 0;
+}