PATCH: middle-end/20303: Can't push more than 16 nested visibility

["H. J. Lu" <hjl at lucon dot org>]

This patch removes the nested visibility push limit. c-pragma.o already
depends on $(TREE_H), which includes vec.h.


H.J.
----
2005-04-05  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/20303
	* c-pragma.c: Include "vec.h".
	(handle_pragma_visibility): Use VEC.

	* doc/invoke.texi: Remove the nested visibility push limit.

--- gcc/c-pragma.c.stack	2004-11-29 15:47:36.000000000 -0800
+++ gcc/c-pragma.c	2005-04-05 10:55:55.039239223 -0700
@@ -34,6 +34,7 @@ Software Foundation, 59 Temple Place - S
 #include "c-common.h"
 #include "output.h"
 #include "tm_p.h"
+#include "vec.h"
 #include "target.h"
 
 #define GCC_BAD(msgid) do { warning (msgid); return; } while (0)
@@ -583,12 +584,19 @@ maybe_apply_renaming_pragma (tree decl, 
 #ifdef HANDLE_PRAGMA_VISIBILITY
 static void handle_pragma_visibility (cpp_reader *);
 
+typedef struct visibility GTY(())
+{
+  enum symbol_visibility value;
+} visibility;
+DEF_VEC_GC_O (visibility);
+static GTY(()) VEC (visibility) *visstack;
+
 /* 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;
+{
+  /* Form is #pragma GCC visibility push(hidden)|pop */
   tree x;
   enum cpp_ttype token;
   enum { bad, push, pop } action = bad;
@@ -608,14 +616,16 @@ handle_pragma_visibility (cpp_reader *du
     {
       if (pop == action)
         {
-          if (!visidx)
+          if (!VEC_length (visibility, visstack))
             {
               GCC_BAD ("No matching push for %<#pragma GCC visibility pop%>");
             }
           else
             {
-              default_visibility = visstack[--visidx];
-              visibility_options.inpragma = (visidx>0);
+	      default_visibility = VEC_last (visibility, visstack)->value;
+	      VEC_pop (visibility, visstack);
+	      visibility_options.inpragma = VEC_length (visibility,
+							visstack);
             }
         }
       else
@@ -627,14 +637,12 @@ handle_pragma_visibility (cpp_reader *du
             {
               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;
+	      visibility *vis;
+	      vis = VEC_safe_push (visibility, visstack, NULL);
+	      vis->value = default_visibility;
               if (!strcmp (str, "default"))
                 default_visibility = VISIBILITY_DEFAULT;
               else if (!strcmp (str, "internal"))
--- gcc/doc/invoke.texi.stack	2005-04-04 13:29:04.000000000 -0700
+++ gcc/doc/invoke.texi	2005-04-05 10:46:16.314103951 -0700
@@ -12372,8 +12372,8 @@ For those adding visibility support to e
 @samp{#pragma GCC visibility} of use.  This works by you enclosing
 the declarations you wish to set visibility for with (for example)
 @samp{#pragma GCC visibility push(hidden)} and
-@samp{#pragma GCC visibility pop}.  These can be nested up to sixteen
-times.  Bear in mind that symbol visibility should be viewed @strong{as
+@samp{#pragma GCC visibility pop}.
+Bear in mind that symbol visibility should be viewed @strong{as
 part of the API interface contract} and thus all new code should
 always specify visibility when it is not the default ie; declarations
 only for use within the local DSO should @strong{always} be marked explicitly