Imported gcc-4.4.3

[msp430-gcc.git] / gcc / config / i386 / winnt-cxx.c

diff --git a/gcc/config/i386/winnt-cxx.c b/gcc/config/i386/winnt-cxx.c
new file mode 100644 (file)
index 0000000..9df7cf6
--- /dev/null
+++ b/gcc/config/i386/winnt-cxx.c
@@ -0,0 +1,143 @@
+/* Target support for C++ classes on Windows.
+   Contributed by Danny Smith (dannysmith@users.sourceforge.net)
+   Copyright (C) 2005, 2007
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "regs.h"
+#include "hard-reg-set.h"
+#include "output.h"
+#include "tree.h"
+#include "cp/cp-tree.h" /* this is why we're a separate module */
+#include "flags.h"
+#include "tm_p.h"
+#include "toplev.h"
+#include "hashtab.h"
+
+bool
+i386_pe_type_dllimport_p (tree decl)
+{
+  gcc_assert (TREE_CODE (decl) == VAR_DECL 
+             || TREE_CODE (decl) == FUNCTION_DECL);
+
+  if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)
+    return false;
+
+  /* We ignore the dllimport attribute for inline member functions.
+     This differs from MSVC behavior which treats it like GNUC
+     'extern inline' extension.  Also ignore for template
+     instantiations with linkonce semantics and artificial methods.  */
+  if (TREE_CODE (decl) ==  FUNCTION_DECL
+      && (DECL_DECLARED_INLINE_P (decl)
+         || DECL_TEMPLATE_INSTANTIATION (decl)
+         || DECL_ARTIFICIAL (decl)))
+    return false;
+
+
+  /* Don't mark defined functions as dllimport.  This code will only be
+     reached if we see a non-inline function defined out-of-class.  */
+  else if (TREE_CODE (decl) ==  FUNCTION_DECL
+          && (DECL_INITIAL (decl)))
+    return false;
+
+  /*  Don't allow definitions of static data members in dllimport class,
+      If vtable data is marked as DECL_EXTERNAL, import it; otherwise just
+      ignore the class attribute.  */
+  else if (TREE_CODE (decl) == VAR_DECL
+          && TREE_STATIC (decl) && TREE_PUBLIC (decl)
+          && !DECL_EXTERNAL (decl))
+    {
+      if (!DECL_VIRTUAL_P (decl))
+         error ("definition of static data member %q+D of "
+                "dllimport'd class", decl);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+i386_pe_type_dllexport_p (tree decl)
+{
+   gcc_assert (TREE_CODE (decl) == VAR_DECL 
+               || TREE_CODE (decl) == FUNCTION_DECL);
+   /* Avoid exporting compiler-generated default dtors and copy ctors.
+      The only artificial methods that need to be exported are virtual
+      and non-virtual thunks.  */
+   if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE
+       && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))
+     return false;
+   return true;
+}
+
+static inline void maybe_add_dllimport (tree decl) 
+{
+  if (i386_pe_type_dllimport_p (decl))
+    DECL_DLLIMPORT_P (decl) = 1;   
+}
+
+void
+i386_pe_adjust_class_at_definition (tree t)
+{
+  tree member;
+
+  gcc_assert (CLASS_TYPE_P (t));
+
+ /* We only look at dllimport.  The only thing that dllexport does is
+    add stuff to a '.drectiv' section at end-of-file, so no need to do
+    anything for dllexport'd classes until we generate RTL. */  
+  if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) == NULL_TREE)
+    return;
+
+  /* We don't actually add the attribute to the decl, just set the flag
+     that signals that the address of this symbol is not a compile-time
+     constant.   Any subsequent out-of-class declaration of members wil
+     cause the DECL_DLLIMPORT_P flag to be unset.
+     (See  tree.c: merge_dllimport_decl_attributes).
+     That is just right since out-of class declarations can only be a
+     definition.  We recheck the class members  at RTL generation to
+     emit warnings if this has happened.  Definition of static data member
+     of dllimport'd class always causes an error (as per MS compiler).
+  */
+
+  /* Check static VAR_DECL's.  */
+  for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
+    if (TREE_CODE (member) == VAR_DECL)     
+      maybe_add_dllimport (member);
+    
+  /* Check FUNCTION_DECL's.  */
+  for (member = TYPE_METHODS (t); member;  member = TREE_CHAIN (member))
+    if (TREE_CODE (member) == FUNCTION_DECL)
+      maybe_add_dllimport (member);
+ 
+  /* Check vtables  */
+  for (member = CLASSTYPE_VTABLES (t); member;  member = TREE_CHAIN (member))
+    if (TREE_CODE (member) == VAR_DECL) 
+      maybe_add_dllimport (member);
+
+/* We leave typeinfo tables alone.  We can't mark TI objects as
+     dllimport, since the address of a secondary VTT may be needed
+     for static initialization of a primary VTT.  VTT's  of
+     dllimport'd classes should always be link-once COMDAT.  */ 
+}