From ba9a991fd34106f884ee46cb3dee1b2169015b13 Mon Sep 17 00:00:00 2001
From: Mark Mitchell <mark@codesourcery.com>
Date: Fri, 25 Oct 2002 06:01:55 +0000
Subject: [PATCH] class.c (end_of_base): New method.

	* class.c (end_of_base): New method.
	(end_of_class): Use it.  Check indirect virtual bases.

	* g++.dg/abi/empty9.C: New test.

From-SVN: r58521
---
 gcc/cp/ChangeLog                  |  3 +++
 gcc/cp/class.c                    | 54 +++++++++++++++++++++++++++------------
 gcc/testsuite/ChangeLog           |  4 +++
 gcc/testsuite/g++.dg/abi/empty9.C | 16 ++++++++++++
 4 files changed, 60 insertions(+), 17 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/abi/empty9.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index a9dc6c8..e90cb24 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 2002-10-24  Mark Mitchell  <mark@codesourcery.com>
 
+	* class.c (end_of_base): New method.
+	(end_of_class): Use it.  Check indirect virtual bases.
+
 	* class.c (check_field_decls): Fix typo.
 
 2002-10-23  Mark Mitchell  <mark@codesourcery.com>
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 20be4eb..c4b49b0 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -210,6 +210,7 @@ static bool contains_empty_class_p (tree);
 static tree dfs_base_derived_from (tree, void *);
 static bool base_derived_from (tree, tree);
 static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree);
+static tree end_of_base (tree);
 
 /* Macros for dfs walking during vtt construction. See
    dfs_ctor_vtable_bases_queue_p, dfs_build_secondary_vptr_vtt_inits
@@ -4699,6 +4700,25 @@ layout_virtual_bases (record_layout_info rli, splay_tree offsets)
 }
 
 /* Returns the offset of the byte just past the end of the base class
+   BINFO.  */
+
+static tree
+end_of_base (tree binfo)
+{
+  tree size;
+
+  if (is_empty_class (BINFO_TYPE (binfo)))
+    /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
+       allocate some space for it. It cannot have virtual bases, so
+       TYPE_SIZE_UNIT is fine.  */
+    size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo));
+  else
+    size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo));
+
+  return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size);
+}
+
+/* Returns the offset of the byte just past the end of the base class
    with the highest offset in T.  If INCLUDE_VIRTUALS_P is zero, then
    only non-virtual bases are included.  */
 
@@ -4708,35 +4728,35 @@ end_of_class (t, include_virtuals_p)
      int include_virtuals_p;
 {
   tree result = size_zero_node;
+  tree binfo;
+  tree offset;
   int i;
 
   for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i)
     {
-      tree base_binfo;
-      tree offset;
-      tree size;
-
-      base_binfo = BINFO_BASETYPE (TYPE_BINFO (t), i);
+      binfo = BINFO_BASETYPE (TYPE_BINFO (t), i);
 
       if (!include_virtuals_p
-	  && TREE_VIA_VIRTUAL (base_binfo) 
-	  && !BINFO_PRIMARY_P (base_binfo))
+	  && TREE_VIA_VIRTUAL (binfo) 
+	  && !BINFO_PRIMARY_P (binfo))
 	continue;
 
-      if (is_empty_class (BINFO_TYPE (base_binfo)))
-	/* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
-	   allocate some space for it. It cannot have virtual bases,
-	   so TYPE_SIZE_UNIT is fine.  */
-	size = TYPE_SIZE_UNIT (BINFO_TYPE (base_binfo));
-      else
-	size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (base_binfo));
-      offset = size_binop (PLUS_EXPR, 
-			   BINFO_OFFSET (base_binfo),
-			   size);
+      offset = end_of_base (binfo);
       if (INT_CST_LT_UNSIGNED (result, offset))
 	result = offset;
     }
 
+  /* G++ 3.2 did not check indirect virtual bases.  */
+  if (abi_version_at_least (2) && include_virtuals_p)
+    for (binfo = CLASSTYPE_VBASECLASSES (t); 
+	 binfo; 
+	 binfo = TREE_CHAIN (binfo))
+      {
+	offset = end_of_base (TREE_VALUE (binfo));
+	if (INT_CST_LT_UNSIGNED (result, offset))
+	  result = offset;
+      }
+
   return result;
 }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 9823511..6ba32d8 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2002-10-24  Mark Mitchell  <mark@codesourcery.com>
+
+	* g++.dg/abi/empty9.C: New test.
+
 2002-10-24  Richard Henderson  <rth@redhat.com>
 
 	* g++.dg/inherit/thunk1.C: Enable for ia64.
diff --git a/gcc/testsuite/g++.dg/abi/empty9.C b/gcc/testsuite/g++.dg/abi/empty9.C
new file mode 100644
index 0000000..757bf6c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/abi/empty9.C
@@ -0,0 +1,16 @@
+// { dg-do run { target i?86-*-* } }
+// { dg-options "-w -fabi-version=0" }
+
+struct E1 {};
+struct E2 : public E1 {
+  virtual void f ();
+};
+struct E3 : virtual public E1 {
+};
+struct S : public E2, virtual public E3 {
+};
+
+int main () {
+  if (sizeof (S) != 12)
+    return 1;
+}
-- 
2.7.4