[PATCH] c++: Don't try to initialize zero width bitfields in zero initialization [PR109868]

[Jakub Jelinek <jakub@redhat.com>]

Hi!

My GCC 12 change to avoid removing zero-sized bitfields as they are
important for ABI and are needed for layout compatibility traits
apparently causes zero sized bitfields to be initialized in the IL,
which at least in 13+ results in ICEs in the ranger which is upset
about zero precision types.

I think we could even avoid initializing other unnamed bitfields, but
unfortunately !CONSTRUCTOR_NO_CLEARING doesn't mean in the middle-end
clearing of padding bits and until we have some new flag that represents
the request to clear padding bits, I think it is better to keep zeroing
non-zero sized unnamed bitfields.

In addition to skipping those fields, I have changed the logic how
UNION_TYPEs are handled, the current code was a little bit weird in that
e.g. if first non-static data member had error_mark_node type, we'd happily
zero initialize the second non-static data member, etc.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk/13,
perhaps even 12?

2023-05-16  Jakub Jelinek  <jakub@redhat.com>

	PR c++/109868
	* init.cc (build_zero_init_1): Don't initialize zero-width bitfields.
	For unions only initialize the first FIELD_DECL.

	* g++.dg/init/pr109868.C: New test.

--- gcc/cp/init.cc.jj	2023-05-01 23:07:05.147417750 +0200
+++ gcc/cp/init.cc	2023-05-16 10:01:14.512489727 +0200
@@ -189,15 +189,21 @@ build_zero_init_1 (tree type, tree nelts
     init = build_zero_cst (type);
   else if (RECORD_OR_UNION_CODE_P (TREE_CODE (type)))
     {
-      tree field;
+      tree field, next;
       vec<constructor_elt, va_gc> *v = NULL;
 
       /* Iterate over the fields, building initializations.  */
-      for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
+      for (field = TYPE_FIELDS (type); field; field = next)
 	{
+	  next = DECL_CHAIN (field);
+
 	  if (TREE_CODE (field) != FIELD_DECL)
 	    continue;
 
+	  /* For unions, only the first field is initialized.  */
+	  if (TREE_CODE (type) == UNION_TYPE)
+	    next = NULL_TREE;
+
 	  if (TREE_TYPE (field) == error_mark_node)
 	    continue;
 
@@ -212,6 +218,11 @@ build_zero_init_1 (tree type, tree nelts
 		continue;
 	    }
 
+	  /* Don't add zero width bitfields.  */
+	  if (DECL_C_BIT_FIELD (field)
+	      && integer_zerop (DECL_SIZE (field)))
+	    continue;
+
 	  /* Note that for class types there will be FIELD_DECLs
 	     corresponding to base classes as well.  Thus, iterating
 	     over TYPE_FIELDs will result in correct initialization of
@@ -230,10 +241,6 @@ build_zero_init_1 (tree type, tree nelts
 	      if (value)
 		CONSTRUCTOR_APPEND_ELT(v, field, value);
 	    }
-
-	  /* For unions, only the first field is initialized.  */
-	  if (TREE_CODE (type) == UNION_TYPE)
-	    break;
 	}
 
       /* Build a constructor to contain the initializations.  */
--- gcc/testsuite/g++.dg/init/pr109868.C.jj	2023-05-16 09:43:54.706278293 +0200
+++ gcc/testsuite/g++.dg/init/pr109868.C	2023-05-16 09:44:16.581966894 +0200
@@ -0,0 +1,13 @@
+// PR c++/109868
+// { dg-do compile }
+// { dg-options "-O2" }
+
+struct A { virtual void foo (); };
+struct B { long b; int : 0; };
+struct C : A { B c; };
+
+void
+bar (C *p)
+{
+  *p = C ();
+}

	Jakub