re PR c++/58882 (ICE with invalid C99 style designated initializers)

/cp
2014-12-15  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/58882
	* decl.c (check_array_designated_initializer): Diagnose gracefully
	C99 designators which aren't integral constant-expressions; allow
	constexpr user-defined type conversion operators.

/testsuite
2014-12-15  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/58882
	* g++.dg/ext/desig8.C: New.
	* g++.dg/cpp0x/desig1.C: Likewise.

From-SVN: r218752

gcc/cp/ChangeLog

+2014-12-15  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/58882
+	* decl.c (check_array_designated_initializer): Diagnose gracefully
+	C99 designators which aren't integral constant-expressions; allow
+	constexpr user-defined type conversion operators.
+
 2014-12-12  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/59628

gcc/cp/decl.c

@@ -4996,18 +4996,22 @@ check_array_designated_initializer (constructor_elt *ce,
 	  return false;
 	}
 
-      ce->index = cxx_constant_value (ce->index);
-
-      if (TREE_CODE (ce->index) == INTEGER_CST)
+      tree ce_index = build_expr_type_conversion (WANT_INT | WANT_ENUM,
+						  ce->index, true);
+      if (ce_index
+	  && INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (ce_index))
+	  && (TREE_CODE (ce_index = maybe_constant_value (ce_index))
+	      == INTEGER_CST))
 	{
 	  /* A C99 designator is OK if it matches the current index.  */
-	  if (wi::eq_p (ce->index, index))
+	  if (wi::eq_p (ce_index, index))
 	    return true;
 	  else
 	    sorry ("non-trivial designated initializers not supported");
 	}
       else
-	gcc_unreachable ();
+	error ("C99 designator %qE is not an integral constant-expression",
+	       ce->index);
 
       return false;
     }

gcc/testsuite/ChangeLog

+2014-12-15  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/58882
+	* g++.dg/ext/desig8.C: New.
+	* g++.dg/cpp0x/desig1.C: Likewise.
+
 2014-12-15  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/63727
@@ -23,8 +29,9 @@
 	instead of %e in regexps trying to match 32-bit GPR.
 	* gcc.target/i386/avx512f-vpbroadcastd-1.c: Likewise.
 	* gcc.target/i386/avx512vl-vpbroadcastd-1.c: Likewise.
-	* gcc.target/i386/avx512vl-vmovdqa64-1.c: Restrict some scan-assembler-times
-	lines to nonpic targets only.  Fix up \[^\n^x^y\] to \[^\nxy\].
+	* gcc.target/i386/avx512vl-vmovdqa64-1.c: Restrict some
+	scan-assembler-times lines to nonpic targets only.
+	Fix up \[^\n^x^y\] to \[^\nxy\].
 
 2014-12-15  Paolo Carlini  <paolo.carlini@oracle.com>
 

gcc/testsuite/g++.dg/cpp0x/desig1.C

+// PR c++/58882
+// { dg-do compile { target c++11 } }
+
+struct A
+{
+  constexpr operator int() const { return 0; }
+};
+
+int a[] = { [A()] = 0 };
+
+enum E { e0 };
+
+struct B
+{
+  constexpr operator E() const { return E::e0; }
+};
+
+int b[] = { [B()] = 0 };
+
+enum class SE { se0 };
+
+struct C
+{
+  constexpr operator SE() const { return SE::se0; }
+};
+
+int c[] = { [C()] = 0 }; // { dg-error "integral constant-expression" }

gcc/testsuite/g++.dg/ext/desig8.C

+// PR c++/58882
+
+int a[] = { [0.] = 0 }; // { dg-error "integral constant-expression" }