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New istreambuf_iterator debug check


Hi

    I'd like to propose this new debug check. Comparing with non-eos istreambuf_iterator sounds like an obvious coding mistake.

    I propose it despite the stage 1 as it is just a new debug check, it doesn't impact the lib in normal mode.

    Tested under Linux x86_64, ok to commit ?

François

diff --git a/libstdc++-v3/include/bits/streambuf_iterator.h b/libstdc++-v3/include/bits/streambuf_iterator.h
index 292ef3a..2e46771 100644
--- a/libstdc++-v3/include/bits/streambuf_iterator.h
+++ b/libstdc++-v3/include/bits/streambuf_iterator.h
@@ -174,7 +174,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       /// Return true both iterators are end or both are not end.
       bool
       equal(const istreambuf_iterator& __b) const
-      { return _M_at_eof() == __b._M_at_eof(); }
+      {
+	bool __this_at_eof = _M_at_eof();
+	bool __b_at_eof = __b._M_at_eof();
+
+	__glibcxx_requires_cond(__this_at_eof || __b_at_eof, _M_message(
+	  "Abnormal comparison to non-end-of-stream istreambuf_iterator"));
+	return __this_at_eof == __b_at_eof;
+      }
 
     private:
       int_type
diff --git a/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/1.cc b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/1.cc
new file mode 100644
index 0000000..bb2e6f8
--- /dev/null
+++ b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/1.cc
@@ -0,0 +1,50 @@
+// Copyright (C) 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/>.
+
+#include <sstream>
+#include <iterator>
+
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  std::istringstream istrs("123456789");
+  typedef std::istreambuf_iterator<char> cistreambuf_iter;
+
+  cistreambuf_iter it(istrs);
+  cistreambuf_iter eof;
+  VERIFY( !it.equal(eof) );
+  VERIFY( !eof.equal(it) );
+  VERIFY( it != eof );
+  VERIFY( eof != it );
+}
+
+void test02()
+{
+  typedef std::istreambuf_iterator<char> cistreambuf_iter;
+
+  cistreambuf_iter eof;
+  VERIFY( eof.equal(eof) );
+  VERIFY( eof == eof );
+}
+
+int main()
+{
+  test01();
+  test02();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/2.cc b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/2.cc
index 3fe1cf1..47a1a00 100644
--- a/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/2.cc
+++ b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/2.cc
@@ -47,7 +47,10 @@ void test02(void)
 
   cistreambuf_iter istrb_it05(istrs01);
   cistreambuf_iter istrb_it06(istrs01.rdbuf());
+
+#ifndef _GLIBCXX_DEBUG
   VERIFY( istrb_it05 == istrb_it06 );
+#endif
   
   // bool equal(istreambuf_iter& b)
   cistreambuf_iter istrb_it07(0);
@@ -57,12 +60,14 @@ void test02(void)
   cistreambuf_iter istrb_it10;
   VERIFY( istrb_it10.equal(istrb_it09) );
 
+#ifndef _GLIBCXX_DEBUG
   cistreambuf_iter istrb_it11(istrs01);
   cistreambuf_iter istrb_it12(istrs01.rdbuf());
   VERIFY( istrb_it11.equal(istrb_it12) );
   cistreambuf_iter istrb_it13(istrs01);
   cistreambuf_iter istrb_it14(istrs01.rdbuf());
   VERIFY( istrb_it14.equal(istrb_it13) );
+#endif
 
   cistreambuf_iter istrb_it15(istrs01);
   cistreambuf_iter istrb_it16;
@@ -77,9 +82,11 @@ void test02(void)
   cistreambuf_iter istrb_it20;
   VERIFY( istrb_it19 == istrb_it20 );
 
+#ifndef _GLIBCXX_DEBUG
   cistreambuf_iter istrb_it21(istrs01);
   cistreambuf_iter istrb_it22(istrs01.rdbuf());
   VERIFY( istrb_it22 == istrb_it21 );
+#endif
 
   cistreambuf_iter istrb_it23(istrs01);
   cistreambuf_iter istrb_it24;
diff --git a/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/debug/3_neg.cc b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/debug/3_neg.cc
new file mode 100644
index 0000000..5e75704
--- /dev/null
+++ b/libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/debug/3_neg.cc
@@ -0,0 +1,37 @@
+// Copyright (C) 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/>.
+
+// { dg-do run { xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <sstream>
+#include <iterator>
+
+void test01()
+{
+  std::istringstream istrs("123456789");
+  typedef std::istreambuf_iterator<char> cistreambuf_iter;
+
+  cistreambuf_iter it1(istrs), it2(istrs);
+  it1 == it2; // No sens
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/char/1.cc b/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/char/1.cc
index 0b2a8fb..fa5d314 100644
--- a/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/char/1.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/char/1.cc
@@ -36,7 +36,7 @@ void test01()
   in_iterator_type end1, it1;
 
   it1 = find(beg1, beg1, 'l');
-  VERIFY( it1 == beg1 );
+  VERIFY( it1 != end1 );
   VERIFY( *it1 == 'D' );
 
   it1 = find(end1, end1, 'D');
diff --git a/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/wchar_t/1.cc b/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/wchar_t/1.cc
index bfb476b..84766fb 100644
--- a/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/wchar_t/1.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/find/istreambuf_iterators/wchar_t/1.cc
@@ -36,7 +36,7 @@ void test01()
   in_iterator_type end1, it1;
 
   it1 = find(beg1, beg1, L'l');
-  VERIFY( it1 == beg1 );
+  VERIFY( it1 != end1 );
   VERIFY( *it1 == L'D' );
 
   it1 = find(end1, end1, L'D');


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