PR c++/9283

	PR c++/15000
	* c-common.c (c_common_attribute_table): Allow
	handle_visibility_attribute to be called for types.
	(handle_visibility_attribute) When given a type, set the visibility
	bits on the TYPE_NAME.  When given a decl, don't set no_add_attrs
	so that we can check later whether the attribute was present. Added
	warning if attribute applied to non class type.
	* c-decl.c (diagnose_mismatched_decls): Updated rules for merging
	decls and checking that they are consistent.
	* common.opt: Added -fvisibility.
	* c.opt, c-opts.c: Added -fvisibility-inlines-hidden.
	* c-pragma.h, c-pragma.c: Added handle_pragma_visibility().
	* flags.h, tree.h: Added assorted support defines for overall patch
	* opts.c: Added parsing support for -fvisibility.
	* tree.c (build_decl): Set visibility for all decls to be whatever
	is in force at that time.
	* varasm.c (default_binds_local_p_1): Reworked logic determining
	when to make a symbol locally bound.
	* doc/invoke.texi: Added documentation for -fvisibility and
	-fvisibility-inlines-hidden.

	PR c++/15000
	PR c++/9283
	* class.c (check_field_decls): Apply hidden visibility if
	-fvisibility-inlines-hidden and inlined unless otherwise specified
	(build_vtable): Set vtable visibility to class visibility.
	(check_field_decls): Default static member visibility to class
	visibility.
	(check_methods): Default method visibility to class visibility.
	* cp-tree.h: Added CLASSTYPE_VISIBILITY and
	CLASSTYPE_VISIBILITY_SPECIFIED macro.
	* decl.c (duplicate_decls): New logic for merging definition decls
	with declaration decls. Added ignore & warning when non default
	applied to global operator new or delete.
	* method.c, optimize.c, rtti.c: Added setting of VISIBILITY_SPECIFIED
	wherever VISIBILITY was changed
	* rtti.c (get_tinfo_decl): Set typeinfo visibility to class
	visibility.
	(tinfo_base_init): Set typeinfo name visibility to class visibility.

	PR c++/9283
	PR c++/15000
	* gcc.dg/visibility-9.c, gcc.dg/visibility-a.c: New tests.
	* g++.dg/ext/visibility/: New directory.
	* g++.dg/ext/visibility-1.C, g++.dg/ext/visibility-2.C
	g++.dg/ext/visibility-3.C, g++.dg/ext/visibility-4.C,
	g++.dg/ext/visibility-5.C, g++.dg/ext/visibility-6.C,
	g++.dg/ext/visibility-7.C: Move to g++.dg/ext/visibility/.
	* g++.dg/ext/visibility/fvisibility.C,
	g++.dg/ext/visibility/fvisibility-inlines-hidden.C,
	g++.dg/ext/visibility/fvisibility-override1.C
	g++.dg/ext/visibility/fvisibility-override2.C
	g++.dg/ext/visibility/memfuncts.C
	g++.dg/ext/visibility/noPLT.C
	g++.dg/ext/visibility/pragma.C
	g++.dg/ext/visibility/pragma-override1.C
	g++.dg/ext/visibility/pragma-override2.C
	g++.dg/ext/visibility/staticmemfuncts.C
	g++.dg/ext/visibility/virtual.C: New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@85167 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 83 insertions, 0 deletions

diff --git a/gcc/c-pragma.c b/gcc/c-pragma.c
index 563e2d7abdc..0bf2f1231bc 100644
--- a/gcc/c-pragma.c
+++ b/gcc/c-pragma.c
@@ -566,6 +566,86 @@ maybe_apply_renaming_pragma (tree decl, tree asmname)
   return 0;
 }
 
+
+#ifdef HANDLE_PRAGMA_VISIBILITY
+static void handle_pragma_visibility (cpp_reader *);
+
+/* Sets the default visibility for symbols to something other than that
+   specified on the command line.  */
+static void
+handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
+{ /* Form is #pragma GCC visibility push(hidden)|pop */
+  static int visstack [16], visidx;
+  tree x;
+  enum cpp_ttype token;
+  enum { bad, push, pop } action = bad;
+ 
+  token = c_lex (&x);
+  if (token == CPP_NAME)
+    {
+      const char *op = IDENTIFIER_POINTER (x);
+      if (!strcmp (op, "push"))
+        action = push;
+      else if (!strcmp (op, "pop"))
+        action = pop;
+    }
+  if (bad == action)
+    GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
+  else
+    {
+      if (pop == action)
+        {
+          if (!visidx)
+            {
+              GCC_BAD ("No matching push for '#pragma GCC visibility pop'");
+            }
+          else
+            {
+              default_visibility = visstack[--visidx];
+              visibility_options.inpragma = (visidx>0);
+            }
+        }
+      else
+        {
+          if (c_lex (&x) != CPP_OPEN_PAREN)
+            GCC_BAD ("missing '(' after '#pragma GCC visibility push' - ignored");
+          token = c_lex (&x);
+          if (token != CPP_NAME)
+            {
+              GCC_BAD ("malformed #pragma GCC visibility push");
+            }
+          else if (visidx >= 16)
+            {
+              GCC_BAD ("No more than sixteen #pragma GCC visibility pushes allowed at once");
+            }
+          else
+            {
+              const char *str = IDENTIFIER_POINTER (x);
+              visstack[visidx++] = default_visibility;
+              if (!strcmp (str, "default"))
+                default_visibility = VISIBILITY_DEFAULT;
+              else if (!strcmp (str, "internal"))
+                default_visibility = VISIBILITY_INTERNAL;
+              else if (!strcmp (str, "hidden"))
+                default_visibility = VISIBILITY_HIDDEN;  
+              else if (!strcmp (str, "protected"))
+                default_visibility = VISIBILITY_PROTECTED;
+              else
+                {
+                  GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
+                }
+              visibility_options.inpragma = 1;
+            }
+          if (c_lex (&x) != CPP_CLOSE_PAREN)
+            GCC_BAD ("missing '(' after '#pragma GCC visibility push' - ignored");
+        }
+    }
+  if (c_lex (&x) != CPP_EOF)
+    warning ("junk at end of '#pragma GCC visibility'");
+}
+
+#endif
+
 /* Front-end wrapper for pragma registration to avoid dragging
    cpplib.h in almost everywhere.  */
 void
@@ -585,6 +665,9 @@ init_pragma (void)
 #ifdef HANDLE_PRAGMA_WEAK
   c_register_pragma (0, "weak", handle_pragma_weak);
 #endif
+#ifdef HANDLE_PRAGMA_VISIBILITY
+  c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
+#endif
 
   c_register_pragma (0, "redefine_extname", handle_pragma_redefine_extname);
   c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);