From e97c94888969b416c239fcaa027770d9b0157323 Mon Sep 17 00:00:00 2001
From: Nathan Sidwell <nathan@codesourcery.com>
Date: Wed, 30 May 2001 08:44:56 +0000
Subject: [PATCH] re PR c++/2936 (gcc gives me an internal error when compiling
 mozilla with --enable-optimization="-O3")

cp:
	PR g++/2936
	* decl.c (finish_anon_union): Copy context.
	* optimize.c (remap_decl): Remap anonymous aggregate members too.
testsuite:
	* g++.old-deja/g++.other/optimize3.C: New file.

From-SVN: r42705
---
 gcc/cp/ChangeLog                              |  6 +++
 gcc/cp/optimize.c                             | 23 ++++++++++-
 gcc/testsuite/ChangeLog                       |  4 ++
 .../g++.old-deja/g++.other/optimize3.C        | 38 +++++++++++++++++++
 4 files changed, 69 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/g++.old-deja/g++.other/optimize3.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 2792f45fd10..e78635c8e8b 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2001-05-30  Nathan Sidwell  <nathan@codesourcery.com>
+
+	PR g++/2936
+	* decl.c (finish_anon_union): Copy context.
+	* optimize.c (remap_decl): Remap anonymous aggregate members too.
+
 2001-05-26  Nathan Sidwell  <nathan@codesourcery.com>
 
 	PR g++/2823
diff --git a/gcc/cp/optimize.c b/gcc/cp/optimize.c
index f81d7e38ae3..8676dd80bcc 100644
--- a/gcc/cp/optimize.c
+++ b/gcc/cp/optimize.c
@@ -106,8 +106,7 @@ static void update_cloned_parm PARAMS ((tree, tree));
    decisions about when a function is too big to inline.  */
 #define INSNS_PER_STMT (10)
 
-/* Remap DECL during the copying of the BLOCK tree for the function.
-   DATA is really an `inline_data *'.  */
+/* Remap DECL during the copying of the BLOCK tree for the function.  */
 
 static tree
 remap_decl (decl, id)
@@ -149,6 +148,26 @@ remap_decl (decl, id)
 		     copy_body_r, id, NULL);
 	}
 
+      if (!DECL_NAME (t) && TREE_TYPE (t)
+	  && ANON_AGGR_TYPE_P (TREE_TYPE ((t))))
+	{
+	  /* For a VAR_DECL of anonymous type, we must also copy the
+	     member VAR_DECLS here and rechain the
+	     DECL_ANON_UNION_ELEMS. */
+	  tree members = NULL;
+	  tree src;
+	  
+	  for (src = DECL_ANON_UNION_ELEMS (t); src;
+	       src = TREE_CHAIN (src))
+	    {
+	      tree member = remap_decl (TREE_VALUE (src), id);
+
+	      my_friendly_assert (!TREE_PURPOSE (src), 20010529);
+	      members = tree_cons (NULL, member, members);
+	    }
+	  DECL_ANON_UNION_ELEMS (t) = nreverse (members);
+	}
+      
       /* Remember it, so that if we encounter this local entity
 	 again we can reuse this copy.  */
       n = splay_tree_insert (id->decl_map,
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 49d5a43d098..c5126b7020c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2001-05-30  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* g++.old-deja/g++.other/optimize3.C: New file.
+
 2001-05-29  Jeffrey Oldham  <oldham@codesourcery.com>
 
         * gcc.c-torture/compile/20010518-2.x: New file to compile, not
diff --git a/gcc/testsuite/g++.old-deja/g++.other/optimize3.C b/gcc/testsuite/g++.old-deja/g++.other/optimize3.C
new file mode 100644
index 00000000000..737aabb3a7a
--- /dev/null
+++ b/gcc/testsuite/g++.old-deja/g++.other/optimize3.C
@@ -0,0 +1,38 @@
+// Special g++ Options: -O2
+// 
+// Copyright (C) 2001 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 29 May 2001 <nathan@codesourcery.com>
+
+// Bug 2936. We ICE'd on tree inlining a function with an anonymous
+// union decl.
+
+inline const unsigned char *Foo (const char *string)
+{
+  union
+  {
+    const char *p1;
+    const unsigned char *p2;
+  };
+  p1 = 0;
+  p2 = 0;
+
+
+  p1 = string;
+  return p2;
+  
+}
+
+const unsigned char *Baz (const char *string)
+{
+  return Foo (string);
+}
+
+int main ()
+{
+  const char *string = "s";
+  const unsigned char *result;
+
+  result = Baz (string);
+  return (static_cast <const void *> (result)
+	  != static_cast <const void *> (string));
+}