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.

6 files changed, 305 insertions, 0 deletions

diff --git a/gdb/unittests/basic_string_view/cons/char/1.cc b/gdb/unittests/basic_string_view/cons/char/1.cc
new file mode 100644
index 0000000..f80ae92
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/char/1.cc
@@ -0,0 +1,68 @@
+// { 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 constructors.
+
+#include <string_view>
+#include <string>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  typedef std::string_view::size_type csize_type;
+
+  // basic_string_view()
+  const std::string_view str00{};
+  VERIFY( str00.length() == 0 );
+  VERIFY( str00.data() == nullptr );
+
+  // basic_string_view(const char*)
+  const char str_lit01[] = "rodeo beach, marin";
+  const std::string_view str01{str_lit01};
+  VERIFY( str01.length() == 18 );
+  VERIFY( str01.data() == str_lit01 );
+  const std::string_view str02{"baker beach, san francisco"};
+  VERIFY( str02.length() == 26 );
+
+  // basic_string_view(const string_view&)
+  std::string_view str04{str01};
+  VERIFY( str04.length() == str01.length() );
+  VERIFY( str04.data() == str01.data() );
+
+  // basic_string_view(const char* s)
+  csize_type len_lit01 = strlen(str_lit01);
+  std::string_view str05{str_lit01, len_lit01};
+  VERIFY( str05.length() == len_lit01 );
+  VERIFY( str05.data() == str_lit01 );
+
+  // basic_string_view(basic_string& s)
+  std::string istr07(10, 'z');
+  std::string_view str07{istr07};
+  VERIFY( str07.length() == 10 );
+}
+
+int
+main()
+{ 
+  test01();
+
+  return 0;
+}
diff --git a/gdb/unittests/basic_string_view/cons/char/2.cc b/gdb/unittests/basic_string_view/cons/char/2.cc
new file mode 100644
index 0000000..8dbca7a
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/char/2.cc
@@ -0,0 +1,47 @@
+// { 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 constructors.
+
+#include <new>
+#include <string_view>
+#include <stdexcept>
+#include <testsuite_hooks.h>
+
+void
+test03()
+{
+  const char* with_nulls = "This contains \0 a zero byte.";
+
+  // These are tests to see how basic_string_view handles data with NUL
+  // bytes.  Obviously basic_string_view(char*) will halt at the first one, but
+  // nothing else should.
+  std::string_view s1(with_nulls, 28);
+  VERIFY( s1.size() == 28 );
+  std::string_view s2(s1);
+  VERIFY( s2.size() == 28 );
+}
+
+int
+main()
+{ 
+  test03();
+
+  return 0;
+}
diff --git a/gdb/unittests/basic_string_view/cons/char/3.cc b/gdb/unittests/basic_string_view/cons/char/3.cc
new file mode 100644
index 0000000..c892cbc
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/char/3.cc
@@ -0,0 +1,39 @@
+// { 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 constructors.
+
+#include <string_view>
+#include <vector>
+#include <testsuite_hooks.h>
+
+void
+test05()
+{
+  char const * s = 0;
+  std::string_view zero_length_built_with_NULL(s, 0);
+}
+
+int
+main()
+{ 
+  test05();
+
+  return 0;
+}
diff --git a/gdb/unittests/basic_string_view/cons/wchar_t/1.cc b/gdb/unittests/basic_string_view/cons/wchar_t/1.cc
new file mode 100644
index 0000000..4f935d5
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/wchar_t/1.cc
@@ -0,0 +1,68 @@
+// { 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 constructors.
+
+#include <string_view>
+#include <string>
+#include <cwchar>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  typedef std::wstring_view::size_type csize_type;
+
+  // basic_string_view()
+  const std::wstring_view str00{};
+  VERIFY( str00.length() == 0 );
+  VERIFY( str00.data() == nullptr );
+
+  // basic_string_view(const char*)
+  const wchar_t str_lit01[] = L"rodeo beach, marin";
+  const std::wstring_view str01{str_lit01};
+  VERIFY( str01.length() == 18 );
+  VERIFY( str01.data() == str_lit01 );
+  const std::wstring_view str02{L"baker beach, san francisco"};
+  VERIFY( str02.length() == 26 );
+
+  // basic_string_view(const string_view&)
+  std::wstring_view str04{str01};
+  VERIFY( str04.length() == str01.length() );
+  VERIFY( str04.data() == str01.data() );
+
+  // basic_string_view(const char* s)
+  csize_type len_lit01 = wcslen(str_lit01);
+  std::wstring_view str05{str_lit01, len_lit01};
+  VERIFY( str05.length() == len_lit01 );
+  VERIFY( str05.data() == str_lit01 );
+
+  // basic_string_view(basic_string& s)
+  std::wstring istr07(10, L'z');
+  std::wstring_view str07{istr07};
+  VERIFY( str07.length() == 10 );
+}
+
+int
+main()
+{ 
+  test01();
+
+  return 0;
+}
diff --git a/gdb/unittests/basic_string_view/cons/wchar_t/2.cc b/gdb/unittests/basic_string_view/cons/wchar_t/2.cc
new file mode 100644
index 0000000..3134ec0
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/wchar_t/2.cc
@@ -0,0 +1,45 @@
+// { 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 constructors.
+
+#include <string_view>
+#include <testsuite_hooks.h>
+
+void
+test03()
+{
+  const wchar_t* with_nulls = L"This contains \0 a zero byte.";
+
+  // These are tests to see how basic_string_view handles data with NUL
+  // bytes.  Obviously basic_string_view(char*) will halt at the first one, but
+  // nothing else should.
+  std::wstring_view s1 (with_nulls, 28);
+  VERIFY( s1.size() == 28 );
+  std::wstring_view s2 (s1);
+  VERIFY( s2.size() == 28 );
+}
+
+int
+main()
+{ 
+  test03();
+
+  return 0;
+}
diff --git a/gdb/unittests/basic_string_view/cons/wchar_t/3.cc b/gdb/unittests/basic_string_view/cons/wchar_t/3.cc
new file mode 100644
index 0000000..c49dc25
--- /dev/null
+++ b/gdb/unittests/basic_string_view/cons/wchar_t/3.cc
@@ -0,0 +1,38 @@
+// { 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 constructors.
+
+#include <string_view>
+#include <testsuite_hooks.h>
+
+void
+test05()
+{
+  wchar_t const * s = 0;
+  std::wstring_view zero_length_built_with_NULL(s, 0);
+}
+
+int
+main()
+{ 
+  test05();
+
+  return 0;
+}