1 files changed, 125 insertions, 0 deletions
diff --git a/gnu/usr.bin/gcc/cp/tinfo.cc b/gnu/usr.bin/gcc/cp/tinfo.cc
new file mode 100644
index 00000000000..d82aaaf0431
--- /dev/null
+++ b/gnu/usr.bin/gcc/cp/tinfo.cc
@@ -0,0 +1,125 @@
+// Methods for type_info for -*- C++ -*- Run Time Type Identification.
+// Copyright (C) 1994, 1996 Free Software Foundation
+
+// This file is part of GNU CC.
+
+// GNU CC 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 2, or (at your option)
+// any later version.
+
+// GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+// the Free Software Foundation, 59 Temple Place - Suite 330,
+// Boston, MA 02111-1307, USA. 
+
+// As a special exception, if you link this library with other files,
+// some of which are compiled with GCC, to produce an executable,
+// this library does not by itself cause the resulting executable
+// to be covered by the GNU General Public License.
+// This exception does not however invalidate any other reasons why
+// the executable file might be covered by the GNU General Public License.
+
+#include <stddef.h>
+#include "tinfo.h"
+#include "new"			// for placement new
+
+// This file contains the minimal working set necessary to link with code
+// that uses virtual functions and -frtti but does not actually use RTTI
+// functionality.
+
+type_info::
+~type_info ()
+{ }
+
+extern "C" void
+__rtti_class (void *addr, const char *name,
+	      const __class_type_info::base_info *bl, size_t bn)
+{ new (addr) __class_type_info (name, bl, bn); }
+
+extern "C" void
+__rtti_si (void *addr, const char *n, const type_info *ti)
+{
+  new (addr) __si_type_info
+    (n, static_cast <const __user_type_info &> (*ti));
+}
+
+extern "C" void
+__rtti_user (void *addr, const char *name)
+{ new (addr) __user_type_info (name); }
+
+// dynamic_cast helper methods.
+// Returns a pointer to the desired sub-object or 0.
+
+void * __user_type_info::
+dcast (const type_info& to, int, void *addr, const type_info *, void *) const
+{ return (*this == to) ? addr : 0; }
+
+void * __si_type_info::
+dcast (const type_info& to, int require_public, void *addr,
+       const type_info *sub, void *subptr) const
+{
+  if (*this == to)
+    return addr;
+  return base.dcast (to, require_public, addr, sub, subptr);
+}
+
+void* __class_type_info::
+dcast (const type_info& desired, int is_public, void *objptr,
+       const type_info *sub, void *subptr) const
+{
+  if (*this == desired)
+    return objptr;
+
+  void *match_found = 0;
+  for (int i = 0; i < n_bases; i++)
+    {
+      if (is_public && base_list[i].access != PUBLIC)
+	continue;
+
+      void *p = (char *)objptr + base_list[i].offset;
+      if (base_list[i].is_virtual)
+	p = *(void **)p;
+      p = base_list[i].base->dcast (desired, is_public, p, sub, subptr);
+      if (p)
+	{
+	  if (match_found == 0)
+	    match_found = p;
+	  else if (match_found != p)
+	    {
+	      if (sub)
+		{
+		  // Perhaps we're downcasting from *sub to desired; see if
+		  // subptr is a subobject of exactly one of {match_found,p}.
+
+		  const __user_type_info &d =
+		    static_cast <const __user_type_info &> (desired);
+
+		  void *os = d.dcast (*sub, 1, match_found);
+		  void *ns = d.dcast (*sub, 1, p);
+
+		  if (os == ns)
+		    /* ambiguous -- subptr is a virtual base */;
+		  else if (os == subptr)
+		    continue;
+		  else if (ns == subptr)
+		    {
+		      match_found = p;
+		      continue;
+		    }
+		}
+
+	      // base found at two different pointers,
+	      // conversion is not unique
+	      return 0;
+	    }
+	}
+    }
+
+  return match_found;
+}