Fix libstdc++/24196 for ext/vstring/rc by returning to the behavior of basic_string pre-2003-06-13...

2005-10-07  Paolo Carlini  <pcarlini@suse.de>

	Fix libstdc++/24196 for ext/vstring/rc by returning to the behavior
	of basic_string pre-2003-06-13; remove fully-dynamic-string stuff.
	* include/ext/rc_string_base.h (_M_refcopy): Move inside the
	_Rep class and remove code in macro.
	(__rc_string_base()): Construct with _S_empty_rep()._M_refcopy().
	(_M_dispose, _M_leak_hard): Remove code in macro.
	(_S_construct): Return _S_empty_rep()._M_refcopy() for empty string.
	(_M_grab): Adjust.

	* include/ext/rc_string_base.h (_Rep::_M_refdata()): Minor tweak,
	mark throw().

From-SVN: r105090

1 files changed, 19 insertions, 35 deletions

diff --git a/libstdc++-v3/include/ext/rc_string_base.h b/libstdc++-v3/include/ext/rc_string_base.h
index 3e9c887..0b35e38 100644
--- a/libstdc++-v3/include/ext/rc_string_base.h
+++ b/libstdc++-v3/include/ext/rc_string_base.h
@@ -134,9 +134,16 @@ namespace __gnu_cxx
 	typedef typename _Alloc::template rebind<size_type>::other _Raw_alloc;
 
  	_CharT*
-	_M_refdata()
+	_M_refdata() throw()
 	{ return reinterpret_cast<_CharT*>(this + 1); }
 
+	_CharT*
+	_M_refcopy() throw()
+	{
+	  __atomic_add(&_M_refcount, 1);
+	  return _M_refdata();
+	}  // XXX MT
+	
 	void
 	_M_set_length(size_type __n)
 	{ 
@@ -191,30 +198,17 @@ namespace __gnu_cxx
       { return &((reinterpret_cast<_Rep*>(_M_data()))[-1]); }
 
       _CharT*
-      _M_refcopy() const throw()
-      {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
-	if (__builtin_expect(_M_rep() != &_S_empty_rep(), false))
-#endif
-	  __atomic_add(&_M_rep()->_M_refcount, 1);
-	return _M_data();
-      }  // XXX MT
-
-      _CharT*
       _M_grab(const _Alloc& __alloc1, const _Alloc& __alloc2) const
       {
 	return (!_M_is_leaked() && __alloc1 == __alloc2)
-	        ? _M_refcopy() : _M_rep()->_M_clone(__alloc1);
+	        ? _M_rep()->_M_refcopy() : _M_rep()->_M_clone(__alloc1);
       }
 
       void
       _M_dispose(const _Alloc& __a)
       {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
-	if (__builtin_expect(_M_rep() != &_S_empty_rep(), false))
-#endif
-	  if (__exchange_and_add(&_M_rep()->_M_refcount, -1) <= 0)
-	    _M_rep()->_M_destroy(__a);
+	if (__exchange_and_add(&_M_rep()->_M_refcount, -1) <= 0)
+	  _M_rep()->_M_destroy(__a);
       }  // XXX MT
 
       void
@@ -303,11 +297,8 @@ namespace __gnu_cxx
       }
 
       __rc_string_base()
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
-      : _M_dataplus(_S_empty_rep()._M_refdata(), _Alloc()) { }
-#else
-      : _M_dataplus(_S_construct(size_type(), _CharT(), _Alloc()), _Alloc()) { }
-#endif
+      : _M_dataplus(_S_empty_rep()._M_refcopy(), _Alloc()) { }
+
       __rc_string_base(const _Alloc& __a);
 
       __rc_string_base(const __rc_string_base& __rcs);
@@ -486,10 +477,6 @@ namespace __gnu_cxx
     __rc_string_base<_CharT, _Traits, _Alloc>::
     _M_leak_hard()
     {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
-      if (_M_rep() == &_S_empty_rep())
-	return;
-#endif
       if (_M_is_shared())
 	_M_mutate(0, 0, 0);
       _M_set_leaked();
@@ -506,10 +493,9 @@ namespace __gnu_cxx
       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
 		   std::input_iterator_tag)
       {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
 	if (__beg == __end && __a == _Alloc())
-	  return _S_empty_rep()._M_refdata();
-#endif
+	  return _S_empty_rep()._M_refcopy();
+
 	// Avoid reallocation for common case.
 	_CharT __buf[128];
 	size_type __len = 0;
@@ -552,10 +538,9 @@ namespace __gnu_cxx
       _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
 		   std::forward_iterator_tag)
       {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
 	if (__beg == __end && __a == _Alloc())
-	  return _S_empty_rep()._M_refdata();
-#endif
+	  return _S_empty_rep()._M_refcopy();
+
 	// NB: Not required, but considered best practice.
 	if (__builtin_expect(__is_null_p(__beg) && __beg != __end, 0))
 	  std::__throw_logic_error(__N("__rc_string_base::"
@@ -581,10 +566,9 @@ namespace __gnu_cxx
     __rc_string_base<_CharT, _Traits, _Alloc>::
     _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
     {
-#ifndef _GLIBCXX_FULLY_DYNAMIC_STRING
       if (__n == 0 && __a == _Alloc())
-	return _S_empty_rep()._M_refdata();
-#endif
+	return _S_empty_rep()._M_refcopy();
+
       // Check for out_of_range and length_error exceptions.
       _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
       if (__n)