PR c++/79464 - ICE in IPA with omitted constructor parms

	* class.c (build_clone): Also omit parms from TYPE_ARG_TYPES.
	(adjust_clone_args): Adjust.
	(add_method): Remember omitted parms.
	* call.c (add_function_candidate): Likewise.
	* mangle.c (write_method_parms): Likewise.
	* method.c (ctor_omit_inherited_parms): Return false if there are no
	parms to omit.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r245495

gcc/cp/ChangeLog

+2017-02-15  Jason Merrill  <jason@redhat.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/79464 - ICE in IPA with omitted constructor parms
+	* class.c (build_clone): Also omit parms from TYPE_ARG_TYPES.
+	(adjust_clone_args): Adjust.
+	(add_method): Remember omitted parms.
+	* call.c (add_function_candidate): Likewise.
+	* mangle.c (write_method_parms): Likewise.
+	* method.c (ctor_omit_inherited_parms): Return false if there are no
+	parms to omit.
+
 2017-02-15  Martin Sebor  <msebor@redhat.com>
 
 	PR c++/79363

gcc/cp/call.c

@@ -2005,7 +2005,11 @@ add_function_candidate (struct z_candidate **candidates,
      considered in overload resolution.  */
   if (DECL_CONSTRUCTOR_P (fn))
     {
-      parmlist = skip_artificial_parms_for (fn, parmlist);
+      if (ctor_omit_inherited_parms (fn))
+	/* Bring back parameters omitted from an inherited ctor.  */
+	parmlist = FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (fn));
+      else
+	parmlist = skip_artificial_parms_for (fn, parmlist);
       skip = num_artificial_parms_for (fn);
       if (skip > 0 && first_arg != NULL_TREE)
 	{

gcc/cp/class.c

@@ -1149,6 +1149,12 @@ add_method (tree type, tree method, tree using_decl)
       if (! DECL_STATIC_FUNCTION_P (method))
 	parms2 = TREE_CHAIN (parms2);
 
+      /* Bring back parameters omitted from an inherited ctor.  */
+      if (ctor_omit_inherited_parms (fn))
+	parms1 = FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (fn));
+      if (ctor_omit_inherited_parms (method))
+	parms2 = FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (method));
+
       if (compparms (parms1, parms2)
 	  && (!DECL_CONV_FN_P (fn)
 	      || same_type_p (TREE_TYPE (fn_type),
@@ -4761,6 +4767,10 @@ build_clone (tree fn, tree name)
 	DECL_VINDEX (clone) = NULL_TREE;
     }
 
+  bool ctor_omit_inherited_parms_p = ctor_omit_inherited_parms (clone);
+  if (ctor_omit_inherited_parms_p)
+    gcc_assert (DECL_HAS_IN_CHARGE_PARM_P (clone));
+
   /* If there was an in-charge parameter, drop it from the function
      type.  */
   if (DECL_HAS_IN_CHARGE_PARM_P (clone))
@@ -4780,8 +4790,12 @@ build_clone (tree fn, tree name)
       if (DECL_HAS_VTT_PARM_P (fn)
 	  && ! DECL_NEEDS_VTT_PARM_P (clone))
 	parmtypes = TREE_CHAIN (parmtypes);
-       /* If this is subobject constructor or destructor, add the vtt
-	 parameter.  */
+      if (ctor_omit_inherited_parms_p)
+	{
+	  /* If we're omitting inherited parms, that just leaves the VTT.  */
+	  gcc_assert (DECL_NEEDS_VTT_PARM_P (clone));
+	  parmtypes = tree_cons (NULL_TREE, vtt_parm_type, void_list_node);
+	}
       TREE_TYPE (clone)
 	= build_method_type_directly (basetype,
 				      TREE_TYPE (TREE_TYPE (clone)),
@@ -4818,7 +4832,7 @@ build_clone (tree fn, tree name)
 
   /* A base constructor inheriting from a virtual base doesn't get the
      arguments.  */
-  if (ctor_omit_inherited_parms (clone))
+  if (ctor_omit_inherited_parms_p)
     DECL_CHAIN (DECL_CHAIN (DECL_ARGUMENTS (clone))) = NULL_TREE;
 
   for (parms = DECL_ARGUMENTS (clone); parms; parms = DECL_CHAIN (parms))
@@ -4965,6 +4979,13 @@ adjust_clone_args (tree decl)
 	   decl_parms = TREE_CHAIN (decl_parms),
 	     clone_parms = TREE_CHAIN (clone_parms))
 	{
+	  if (clone_parms == void_list_node)
+	    {
+	      gcc_assert (decl_parms == clone_parms
+			  || ctor_omit_inherited_parms (clone));
+	      break;
+	    }
+
 	  gcc_assert (same_type_p (TREE_TYPE (decl_parms),
 				   TREE_TYPE (clone_parms)));
 
@@ -4999,7 +5020,7 @@ adjust_clone_args (tree decl)
 	      break;
 	    }
 	}
-      gcc_assert (!clone_parms);
+      gcc_assert (!clone_parms || clone_parms == void_list_node);
     }
 }
 

gcc/cp/mangle.c

@@ -2740,6 +2740,10 @@ write_method_parms (tree parm_types, const int method_p, const tree decl)
 	  parm_types = TREE_CHAIN (parm_types);
 	  parm_decl = DECL_CHAIN (parm_decl);
 	}
+
+      if (decl && ctor_omit_inherited_parms (decl))
+	/* Bring back parameters omitted from an inherited ctor.  */
+	parm_types = FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (decl));
     }
 
   for (first_parm_type = parm_types;

gcc/cp/method.c

@@ -575,6 +575,9 @@ ctor_omit_inherited_parms (tree fn)
   if (!DECL_BASE_CONSTRUCTOR_P (fn)
       || !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
     return false;
+  if (FUNCTION_FIRST_USER_PARMTYPE (DECL_ORIGIN (fn)) == void_list_node)
+    /* No user-declared parameters to omit.  */
+    return false;
   tree binfo = inherited_ctor_binfo (fn);
   for (; binfo; binfo = BINFO_INHERITANCE_CHAIN (binfo))
     if (BINFO_VIRTUAL_P (binfo))

gcc/testsuite/g++.dg/cpp1z/inh-ctor23.C

 // Testcase from P0136
 // { dg-do compile { target c++11 } }
-// { dg-options "-fnew-inheriting-ctors -fdump-tree-gimple" }
+// { dg-options "-fnew-inheriting-ctors -fdump-tree-gimple -O2 -fno-inline" }
 
 struct W { W(int); };
 struct V: W { using W::W; };