re PR c++/80095 (ICE with this pointer in NSDMI)

	PR c++/80095
	* call.c (build_over_call): Don't check cxx_dialect.
	* cp-gimplify.c (cp_gimplify_init_expr): Don't check cxx_dialect nor
	whether SUB is a CONSTRUCTOR.
	* init.c (build_new_1): Don't check cxx_dialect.
	* tree.c (replace_placeholders): Add a function comment.  Return if
	not in C++14, or if the object isn't a (member of a) class.
	* typeck2.c (store_init_value): Don't check cxx_dialect nor whether
	TYPE is CLASS_TYPE_P.

	* g++.dg/cpp1y/nsdmi-aggr8.C: New test.

From-SVN: r246772

8 files changed, 50 insertions, 11 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 5ffd1b7..a31d114 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -3,6 +3,16 @@
 	PR sanitizer/80348
 	* typeck.c (cp_build_binary_op): Convert COP[01] to ORIG_TYPE.
 
+	PR c++/80095
+	* call.c (build_over_call): Don't check cxx_dialect.
+	* cp-gimplify.c (cp_gimplify_init_expr): Don't check cxx_dialect nor
+	whether SUB is a CONSTRUCTOR.
+	* init.c (build_new_1): Don't check cxx_dialect.
+	* tree.c (replace_placeholders): Add a function comment.  Return if
+	not in C++14, or if the object isn't a (member of a) class.
+	* typeck2.c (store_init_value): Don't check cxx_dialect nor whether
+	TYPE is CLASS_TYPE_P.
+
 2017-04-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/80309
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 803fbd4..c15b8e4 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -8047,9 +8047,8 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
 	{
 	  arg = cp_build_indirect_ref (arg, RO_NULL, complain);
 	  val = build2 (MODIFY_EXPR, TREE_TYPE (to), to, arg);
-	  if (cxx_dialect >= cxx14)
-	    /* Handle NSDMI that refer to the object being initialized.  */
-	    replace_placeholders (arg, to);
+	  /* Handle NSDMI that refer to the object being initialized.  */
+	  replace_placeholders (arg, to);
 	}
       else
 	{
diff --git a/gcc/cp/cp-gimplify.c b/gcc/cp/cp-gimplify.c
index 6e49daf..f2c5296 100644
--- a/gcc/cp/cp-gimplify.c
+++ b/gcc/cp/cp-gimplify.c
@@ -496,9 +496,8 @@ cp_gimplify_init_expr (tree *expr_p)
 	    TREE_TYPE (from) = void_type_node;
 	}
 
-      if (cxx_dialect >= cxx14 && TREE_CODE (sub) == CONSTRUCTOR)
-	/* Handle aggregate NSDMI.  */
-	replace_placeholders (sub, to);
+      /* Handle aggregate NSDMI.  */
+      replace_placeholders (sub, to);
 
       if (t == sub)
 	break;
diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index 2015205..bfa9020 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -3373,8 +3373,7 @@ build_new_1 (vec<tree, va_gc> **placement, tree type, tree nelts,
 	     object being initialized, replace them now and don't try to
 	     preevaluate.  */
 	  bool had_placeholder = false;
-	  if (cxx_dialect >= cxx14
-	      && !processing_template_decl
+	  if (!processing_template_decl
 	      && TREE_CODE (init_expr) == INIT_EXPR)
 	    TREE_OPERAND (init_expr, 1)
 	      = replace_placeholders (TREE_OPERAND (init_expr, 1),
diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 2757af6..9939135 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -2813,9 +2813,23 @@ replace_placeholders_r (tree* t, int* walk_subtrees, void* data_)
   return NULL_TREE;
 }
 
+/* Replace PLACEHOLDER_EXPRs in EXP with object OBJ.  SEEN_P is set if
+   a PLACEHOLDER_EXPR has been encountered.  */
+
 tree
 replace_placeholders (tree exp, tree obj, bool *seen_p)
 {
+  /* This is only relevant for C++14.  */
+  if (cxx_dialect < cxx14)
+    return exp;
+
+  /* If the object isn't a (member of a) class, do nothing.  */
+  tree op0 = obj;
+  while (TREE_CODE (op0) == COMPONENT_REF)
+    op0 = TREE_OPERAND (op0, 0);
+  if (!CLASS_TYPE_P (strip_array_types (TREE_TYPE (op0))))
+    return exp;
+
   tree *tp = &exp;
   replace_placeholders_t data = { obj, false };
   if (TREE_CODE (exp) == TARGET_EXPR)
diff --git a/gcc/cp/typeck2.c b/gcc/cp/typeck2.c
index d1a3930..1f0eb45 100644
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -840,9 +840,8 @@ store_init_value (tree decl, tree init, vec<tree, va_gc>** cleanups, int flags)
     }
   value = cp_fully_fold (value);
 
-  if (cxx_dialect >= cxx14 && CLASS_TYPE_P (strip_array_types (type)))
-    /* Handle aggregate NSDMI in non-constant initializers, too.  */
-    value = replace_placeholders (value, decl);
+  /* Handle aggregate NSDMI in non-constant initializers, too.  */
+  value = replace_placeholders (value, decl);
 
   /* DECL may change value; purge caches.  */
   clear_cv_and_fold_caches ();
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index fbaef7a..6150f74 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -3,6 +3,9 @@
 	PR sanitizer/80348
 	* g++.dg/ubsan/div-by-zero-2.C: New test.
 
+	PR c++/80095
+	* g++.dg/cpp1y/nsdmi-aggr8.C: New test.
+
 2017-04-07  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/70478
diff --git a/gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr8.C b/gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr8.C
new file mode 100644
index 0000000..8c99ffb
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr8.C
@@ -0,0 +1,16 @@
+// PR c++/80095
+// { dg-do compile { target c++14 } }
+
+struct A
+{
+  void* p = this;
+};
+
+void
+foo ()
+{
+  const A& a = A{};
+  A&& a2 = A{};
+  const A& a3{};
+  A&& a4{};
+}