cp-tree.h (struct lang_type): Added non_zero_init.

* cp-tree.h (struct lang_type): Added non_zero_init.
(CLASS_NON_ZERO_INIT_P): New macro.
(zero_init_p, force_store_init_value, build_forced_zero_init): Declare.
* class.c (check_field_decls): Test non_zero_init.
* cvt.c (convert_to_pointer_force): Use cp_convert_to_pointer for
zero-to-NULL conversions.
* decl.c (obscure_complex_init): Don't reset DECL_INITIAL of a
type that needs zero-initialization without zeros.
(check_initializer_decl): Compute zero-initializer for types
that require a non-trivial one.
* init.c (build_forced_zero_init): New function.
(build_default_init): Use it.
* tree.c (zero_init_p): New function.
* typeck2.c (force_store_init_value): New function.
(process_init_constructor): Create non-trivial zero-initializers
for array members and class fields.

From-SVN: r53461

1 files changed, 22 insertions, 1 deletions

diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 02d5a4b..9a52cc0 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -1,6 +1,6 @@
 /* Language-dependent node constructors for parse phase of GNU compiler.
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001 Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002 Free Software Foundation, Inc.
    Hacked by Michael Tiemann (tiemann@cygnus.com)
 
 This file is part of GNU CC.
@@ -1901,6 +1901,27 @@ pod_type_p (t)
   return 1;
 }
 
+/* Returns 1 iff zero initialization of type T means actually storing
+   zeros in it.  */
+
+int
+zero_init_p (t)
+     tree t;
+{
+  t = strip_array_types (t);
+
+  /* NULL pointers to data members are initialized with -1.  */
+  if (TYPE_PTRMEM_P (t))
+    return 0;
+
+  /* Classes that contain types that can't be zero-initialized, cannot
+     be zero-initialized themselves.  */
+  if (CLASS_TYPE_P (t) && CLASSTYPE_NON_ZERO_INIT_P (t))
+    return 0;
+
+  return 1;
+}
+
 /* Table of valid C++ attributes.  */
 const struct attribute_spec cxx_attribute_table[] =
 {