Fix pr21584

[Diego Novillo <dnovillo at redhat dot com>]

When we assign name tags to pointers, we need to traverse all
pointers, not just the dereferenced ones.  This was causing SSA
verification failures because non-dereferenced pointers ended up
with a name tag (which in itself isn't a tragedy, the analyzer is
being a bit anal here).

I'm overhauling all of this in the next few days, but in the
meantime, this should fix the error.  Will commit after testing.




	* tree-ssa-alias.c (create_name_tags): Also process
	non-dereferenced pointers.

testsuite/ChangeLog

	* g++.dg/tree-ssa/pr21584-1.C: New test.
	* g++.dg/tree-ssa/pr21584-2.C: New test.

Index: tree-ssa-alias.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-ssa-alias.c,v
retrieving revision 2.98
diff -d -u -p -r2.98 tree-ssa-alias.c
--- tree-ssa-alias.c	25 Jun 2005 02:01:32 -0000	2.98
+++ tree-ssa-alias.c	30 Jun 2005 21:22:09 -0000
@@ -782,10 +782,15 @@ create_name_tags (struct alias_info *ai)
 {
   size_t i;
 
-  for (i = 0; i < VARRAY_ACTIVE_SIZE (ai->processed_ptrs); i++)
+  for (i = 1; i < num_ssa_names; i++)
     {
-      tree ptr = VARRAY_TREE (ai->processed_ptrs, i);
-      struct ptr_info_def *pi = SSA_NAME_PTR_INFO (ptr);
+      tree ptr = ssa_name (i);
+      struct ptr_info_def *pi;
+
+      if (ptr == NULL_TREE || !POINTER_TYPE_P (TREE_TYPE (ptr)))
+	continue;
+
+      pi = SSA_NAME_PTR_INFO (ptr);
 
       if (pi->pt_anything || !pi->is_dereferenced)
 	{
Index: testsuite/g++.dg/tree-ssa/pr21584-1.C
===================================================================
RCS file: testsuite/g++.dg/tree-ssa/pr21584-1.C
diff -N testsuite/g++.dg/tree-ssa/pr21584-1.C
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ testsuite/g++.dg/tree-ssa/pr21584-1.C	30 Jun 2005 21:22:10 -0000
@@ -0,0 +1,38 @@
+extern "C" {
+
+extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
+     throw () __attribute__ ((__nonnull__ (1, 2)));
+
+extern char *foo (char *__restrict __s) throw ();
+}
+
+class cset {
+public:
+  cset();
+  int operator()(unsigned char) const;
+private:
+  char v[(127 * 2 + 1)+1];
+};
+
+inline int cset::operator()(unsigned char c) const
+{
+  return v[c];
+}
+
+extern cset csspace;
+
+void baz()
+{
+  char *vec;
+  char buf[512];
+
+  char *p = buf;
+  while (csspace(*p))
+    p++;
+
+  if (*p != '#' && (p = foo(buf)) != 0) {
+    vec = new char[10+ 1];
+    strcpy(vec, p);
+  }
+}
+
Index: testsuite/g++.dg/tree-ssa/pr21584-2.C
===================================================================
RCS file: testsuite/g++.dg/tree-ssa/pr21584-2.C
diff -N testsuite/g++.dg/tree-ssa/pr21584-2.C
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ testsuite/g++.dg/tree-ssa/pr21584-2.C	30 Jun 2005 21:22:10 -0000
@@ -0,0 +1,22 @@
+extern char *strcpy (char *__restrict __dest, __const char *__restrict __src);
+
+extern char *foo (void);
+extern void *malloc(__SIZE_TYPE__) __attribute__((malloc));
+
+char v[100];
+
+void baz()
+{
+  char *vec;
+  char buf[512];
+
+  char *p = buf;
+  while (v[(*p)])
+    p++;
+
+  if (*p != '#' && (p = foo()) != 0) {
+    strcpy ((char*)malloc(10), p);
+  }
+}
+
+