re PR libstdc++/58576 (std::regex_match() reports mismatched braces on a valid regex)

2013-10-01  Tim Shen  <timshen91@gmail.com>

	PR libstdc++/58576
	* include/bits/regex_automaton.tcc (_NFA<>::_M_eliminate_dummy)
	(_StateSeq<>::_M_clone): Add _S_opcode_subexpr_lookahead branch.
	* testsuite/28_regex/algorithms/regex_match/ecma/char/58576.cc: New.

From-SVN: r203067

3 files changed, 111 insertions, 3 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 3e5ca68..44e0d95 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2013-10-01  Tim Shen  <timshen91@gmail.com>
+
+	PR libstdc++/58576
+	* include/bits/regex_automaton.tcc (_NFA<>::_M_eliminate_dummy)
+	(_StateSeq<>::_M_clone): Add _S_opcode_subexpr_lookahead branch.
+	* testsuite/28_regex/algorithms/regex_match/ecma/char/58576.cc: New.
+
 2013-09-30  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* include/parallel/algo.h (__find_switch): Use __binder2nd.
diff --git a/libstdc++-v3/include/bits/regex_automaton.tcc b/libstdc++-v3/include/bits/regex_automaton.tcc
index 13af984..3402ef3 100644
--- a/libstdc++-v3/include/bits/regex_automaton.tcc
+++ b/libstdc++-v3/include/bits/regex_automaton.tcc
@@ -175,7 +175,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  while (__it._M_next >= 0 && (*this)[__it._M_next]._M_opcode
 		 == _S_opcode_dummy)
 	    __it._M_next = (*this)[__it._M_next]._M_next;
-	  if (__it._M_opcode == _S_opcode_alternative)
+	  if (__it._M_opcode == _S_opcode_alternative
+	      || __it._M_opcode == _S_opcode_subexpr_lookahead)
 	    while (__it._M_alt >= 0 && (*this)[__it._M_alt]._M_opcode
 		   == _S_opcode_dummy)
 	      __it._M_alt = (*this)[__it._M_alt]._M_next;
@@ -201,7 +202,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    continue;
 	  if (__m.count(__dup._M_next) == 0)
 	    __stack.push(__dup._M_next);
-	  if (__dup._M_opcode == _S_opcode_alternative)
+	  if (__dup._M_opcode == _S_opcode_alternative
+	      || __dup._M_opcode == _S_opcode_subexpr_lookahead)
 	    if (__m.count(__dup._M_alt) == 0)
 	      __stack.push(__dup._M_alt);
 	}
@@ -213,7 +215,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	      _GLIBCXX_DEBUG_ASSERT(__m.count(__ref._M_next));
 	      __ref._M_next = __m[__ref._M_next];
 	    }
-	  if (__ref._M_opcode == _S_opcode_alternative)
+	  if (__ref._M_opcode == _S_opcode_alternative
+	      || __ref._M_opcode == _S_opcode_subexpr_lookahead)
 	    if (__ref._M_alt != -1)
 	      {
 		_GLIBCXX_DEBUG_ASSERT(__m.count(__ref._M_alt));
diff --git a/libstdc++-v3/testsuite/28_regex/algorithms/regex_match/ecma/char/58576.cc b/libstdc++-v3/testsuite/28_regex/algorithms/regex_match/ecma/char/58576.cc
new file mode 100644
index 0000000..1a1365c
--- /dev/null
+++ b/libstdc++-v3/testsuite/28_regex/algorithms/regex_match/ecma/char/58576.cc
@@ -0,0 +1,98 @@
+// { dg-options "-std=gnu++11" }
+
+//
+// 2013-10-01  Tim Shen <timshen91@gmail.com>
+//
+// Copyright (C) 2013 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/>.
+
+// 28.11.2 regex_match
+
+#include <regex>
+#include <testsuite_hooks.h>
+
+// libstdc++/58576
+void
+test01()
+{
+  using namespace std;
+
+  bool test __attribute__((unused)) = true;
+
+  string domain_name = "valid.hostname.org";
+  /**
+   * based on http://stackoverflow.com/questions/1418423/the-hostname-regex
+   */
+  regex fqdn_regex
+  (
+    "^"
+    "(?=.{1,255}$)"
+    "[[:alnum:]]"
+    "("
+	    "(([[:alnum:]]|-)"
+	    "{0,61})"
+	    "[[:alnum:]]"
+    ")?"
+    "("
+	    "\\."
+	    "[[:alnum:]]"
+	    "("
+		    "(([[:alnum:]]|-)"
+		    "{0,61})"
+		    "[[:alnum:]]"
+	    ")?"
+    ")*"
+    "\\.?"
+    "$"
+  );
+
+  smatch m;
+  const char* sol[] =
+  {
+    "valid.hostname.org",
+    "alid",
+    "ali",
+    "i",
+    ".org",
+    "rg",
+    "r",
+    "r",
+  };
+  try
+    {
+      VERIFY(regex_match( domain_name, m, fqdn_regex ));
+      VERIFY(m.size() == sizeof(sol) / sizeof(*sol));
+      for (int i = 0; i < (int)m.size(); i++) {
+	  string s(m[i].first, m[i].second);
+	  VERIFY(s == sol[i]);
+      }
+    }
+  catch ( const regex_error& ex )
+    {
+      if ( ex.code() == regex_constants::error_brack )
+	{
+	  throw;
+	}
+    }
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}