re PR c++/62129 (internal compiler error: in output_constant, at varasm.c:4755)

	PR c++/62129
	* class.c (outermost_open_class): New.
	* cp-tree.h: Declare it.
	* decl.c (maybe_register_incomplete_var): Use it.
	(complete_vars): Handle any constant variable.
	* expr.c (cplus_expand_constant): Handle CONSTRUCTOR.

From-SVN: r214333

6 files changed, 64 insertions, 8 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 8505e9c..8102054 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,12 @@
+2014-08-22  Jason Merrill  <jason@redhat.com>
+
+	PR c++/62129
+	* class.c (outermost_open_class): New.
+	* cp-tree.h: Declare it.
+	* decl.c (maybe_register_incomplete_var): Use it.
+	(complete_vars): Handle any constant variable.
+	* expr.c (cplus_expand_constant): Handle CONSTRUCTOR.
+
 2014-08-22  Igor Zamyatin  <igor.zamyatin@intel.com>
 
 	PR other/62008
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index c7ecf70..fd22930 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -7132,6 +7132,27 @@ currently_open_derived_class (tree t)
   return NULL_TREE;
 }
 
+/* Return the outermost enclosing class type that is still open, or
+   NULL_TREE.  */
+
+tree
+outermost_open_class (void)
+{
+  if (!current_class_type)
+    return NULL_TREE;
+  tree r = NULL_TREE;
+  for (int i = current_class_depth; i > 0; --i)
+    {
+      if (current_class_stack[i].hidden)
+	break;
+      tree t = current_class_stack[i].type;
+      if (!TYPE_BEING_DEFINED (t))
+	break;
+      r = t;
+    }
+  return r;
+}
+
 /* Returns the innermost class type which is not a lambda closure type.  */
 
 tree
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 64049c4..34373b7 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -5154,6 +5154,7 @@ extern void resort_type_method_vec		(void *, void *,
 extern bool add_method				(tree, tree, tree);
 extern bool currently_open_class		(tree);
 extern tree currently_open_derived_class	(tree);
+extern tree outermost_open_class		(void);
 extern tree current_nonlambda_class_type	(void);
 extern tree finish_struct			(tree, tree);
 extern void finish_struct_1			(tree);
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index cc54cca..2e4e7f8 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -14311,8 +14311,8 @@ grokmethod (cp_decl_specifier_seq *declspecs,
 /* VAR is a VAR_DECL.  If its type is incomplete, remember VAR so that
    we can lay it out later, when and if its type becomes complete.
 
-   Also handle constexpr pointer to member variables where the initializer
-   is an unlowered PTRMEM_CST because the class isn't complete yet.  */
+   Also handle constexpr variables where the initializer involves
+   an unlowered PTRMEM_CST because the class isn't complete yet.  */
 
 void
 maybe_register_incomplete_var (tree var)
@@ -14337,12 +14337,13 @@ maybe_register_incomplete_var (tree var)
 	  incomplete_var iv = {var, inner_type};
 	  vec_safe_push (incomplete_vars, iv);
 	}
-      else if (TYPE_PTRMEM_P (inner_type)
-	       && DECL_INITIAL (var)
-	       && TREE_CODE (DECL_INITIAL (var)) == PTRMEM_CST)
+      else if (!(DECL_LANG_SPECIFIC (var) && DECL_TEMPLATE_INFO (var))
+	       && decl_constant_var_p (var)
+	       && (TYPE_PTRMEM_P (inner_type) || CLASS_TYPE_P (inner_type)))
 	{
-	  tree context = TYPE_PTRMEM_CLASS_TYPE (inner_type);
-	  gcc_assert (TYPE_BEING_DEFINED (context));
+	  /* When the outermost open class is complete we can resolve any
+	     pointers-to-members.  */
+	  tree context = outermost_open_class ();
 	  incomplete_var iv = {var, context};
 	  vec_safe_push (incomplete_vars, iv);
 	}
@@ -14366,7 +14367,7 @@ complete_vars (tree type)
 	  tree var = iv->decl;
 	  tree type = TREE_TYPE (var);
 
-	  if (TYPE_PTRMEM_P (type))
+	  if (decl_constant_var_p (var))
 	    DECL_INITIAL (var) = cplus_expand_constant (DECL_INITIAL (var));
 	  else
 	    {
diff --git a/gcc/cp/expr.c b/gcc/cp/expr.c
index a62e0f9..99f8006 100644
--- a/gcc/cp/expr.c
+++ b/gcc/cp/expr.c
@@ -74,6 +74,14 @@ cplus_expand_constant (tree cst)
       }
       break;
 
+    case CONSTRUCTOR:
+      {
+	constructor_elt *elt;
+	unsigned HOST_WIDE_INT idx;
+	FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (cst), idx, elt)
+	  elt->value = cplus_expand_constant (elt->value);
+      }
+
     default:
       /* There's nothing to do.  */
       break;
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-ptrmem3.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-ptrmem3.C
new file mode 100644
index 0000000..c5e2101
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-ptrmem3.C
@@ -0,0 +1,16 @@
+// PR c++/62129
+// { dg-do compile { target c++11 } }
+
+class Evaluator
+{
+  int MakeChangelist ();
+  typedef int (Evaluator::*fac_t)();
+  struct CreatorEntry
+  {
+    const char *type;
+    fac_t factory;
+  };
+  static constexpr CreatorEntry kCreators[] = { "", &Evaluator::MakeChangelist };
+};
+
+constexpr Evaluator::CreatorEntry Evaluator::kCreators[];