/* Target support for C++ classes on Windows.
Contributed by Danny Smith (dannysmith@users.sourceforge.net)
- Copyright (C) 2005, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
This file is part of GCC.
#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 "cp/cp-tree.h" /* This is why we're a separate module. */
#include "flags.h"
#include "tm_p.h"
#include "toplev.h"
|| 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;
- }
-
+
+ /* Overrides of the class dllimport decls by out-of-class definitions are
+ handled by tree.c:merge_dllimport_decl_attributes. */
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;
+ 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;
+ DECL_DLLIMPORT_P (decl) = 1;
+}
+
+static inline void maybe_add_dllexport (tree decl)
+{
+ if (i386_pe_type_dllexport_p (decl))
+ {
+ tree decl_attrs = DECL_ATTRIBUTES (decl);
+ if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE)
+ /* Already done. */
+ return;
+ DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"),
+ NULL_TREE, decl_attrs);
+ }
}
void
tree member;
gcc_assert (CLASS_TYPE_P (t));
+
+
+ if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
+ {
+ /* Check static VAR_DECL's. */
+ for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
+ if (TREE_CODE (member) == VAR_DECL)
+ maybe_add_dllexport (member);
+
+ /* Check FUNCTION_DECL's. */
+ for (member = TYPE_METHODS (t); member; member = TREE_CHAIN (member))
+ if (TREE_CODE (member) == FUNCTION_DECL)
+ {
+ tree thunk;
+ maybe_add_dllexport (member);
+
+ /* Also add the attribute to its thunks. */
+ for (thunk = DECL_THUNKS (member); thunk;
+ thunk = TREE_CHAIN (thunk))
+ maybe_add_dllexport (thunk);
+ }
+ /* Check vtables */
+ for (member = CLASSTYPE_VTABLES (t); member; member = TREE_CHAIN (member))
+ if (TREE_CODE (member) == VAR_DECL)
+ maybe_add_dllexport (member);
+ }
- /* 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);
+ else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE)
+ {
+ /* 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. */
+
+ /* 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 FUNCTION_DECL's. */
+ for (member = TYPE_METHODS (t); member; member = TREE_CHAIN (member))
+ if (TREE_CODE (member) == FUNCTION_DECL)
+ {
+ tree thunk;
+ maybe_add_dllimport (member);
+
+ /* Also add the attribute to its thunks. */
+ for (thunk = DECL_THUNKS (member); thunk;
+ thunk = TREE_CHAIN (thunk))
+ maybe_add_dllimport (thunk);
+ }
- /* 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. */
+ /* 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. */
+ }
}
static bool
i386_pe_determine_dllexport_p (tree decl)
{
- tree assoc;
-
if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
return false;
if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
return true;
- /* Also mark class members of exported classes with dllexport. */
- assoc = associated_type (decl);
- if (assoc && lookup_attribute ("dllexport", TYPE_ATTRIBUTES (assoc)))
- return i386_pe_type_dllexport_p (decl);
-
return false;
}
if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
return false;
- /* Lookup the attribute in addition to checking the DECL_DLLIMPORT_P flag.
- We may need to override an earlier decision. */
if (DECL_DLLIMPORT_P (decl))
return true;
/* The DECL_DLLIMPORT_P flag was set for decls in the class definition
by targetm.cxx.adjust_class_at_definition. Check again to emit
- warnings if the class attribute has been overridden by an
- out-of-class definition. */
+ error message if the class attribute has been overridden by an
+ out-of-class definition of static data. */
assoc = associated_type (decl);
- if (assoc && lookup_attribute ("dllimport", TYPE_ATTRIBUTES (assoc)))
- return i386_pe_type_dllimport_p (decl);
+ if (assoc && lookup_attribute ("dllimport", TYPE_ATTRIBUTES (assoc))
+ && TREE_CODE (decl) == VAR_DECL
+ && TREE_STATIC (decl) && TREE_PUBLIC (decl)
+ && !DECL_EXTERNAL (decl)
+ /* vtable's are linkonce constants, so defining a vtable is not
+ an error as long as we don't try to import it too. */
+ && !DECL_VIRTUAL_P (decl))
+ error ("definition of static data member %q+D of "
+ "dllimport'd class", decl);
return false;
}
if (i386_pe_determine_dllexport_p (decl))
flags |= SYMBOL_FLAG_DLLEXPORT;
else if (i386_pe_determine_dllimport_p (decl))
- {
- flags |= SYMBOL_FLAG_DLLIMPORT;
- /* If we went through the associated_type path, this won't already
- be set. Though, frankly, this seems wrong, and should be fixed
- elsewhere. */
- if (!DECL_DLLIMPORT_P (decl))
- {
- DECL_DLLIMPORT_P (decl) = 1;
- flags &= ~SYMBOL_FLAG_LOCAL;
- }
- }
+ flags |= SYMBOL_FLAG_DLLIMPORT;
+
SYMBOL_REF_FLAGS (symbol) = flags;
}
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