Hi!
While writing a testcase for __builtin_launder, I've noticed we don't parse
__builtin_shuffle or __builtin_addressof properly (as well as do error
recovery e.g. for typeid in constant expression etc.).
The problem is that several spots would return something; from the first
switch in cp_parser_postfix_expression, but that is not something we really
want, that primary expression part can be followed by [, ., -> etc. to form
postfix-expression, but this is done in the same function. So instead of
returning, we need to set postfix_expression to whatever we were returning
and just get out of the first switch, then continue parsing in the loop
after that.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
For release branches, __builtin_addressof doesn't apply and the
__builtin_shuffle code is differently formatted, but the bug is there
for __builtin_shuffle, ok to backport to the release branches too?
2016-10-22 Jakub Jelinek <ja...@redhat.com>
PR c++/78089
* parser.c (cp_parser_postfix_expression): Replace return statement in
the first switch with setting postfix_expression to the return
expression and break;.
* c-c++-common/builtin-shuffle-1.c: New test.
* g++.dg/cpp0x/addressof3.C: New test.
--- gcc/cp/parser.c.jj 2016-10-22 20:58:11.000000000 +0200
+++ gcc/cp/parser.c 2016-10-22 21:03:57.504037757 +0200
@@ -6441,7 +6441,10 @@ cp_parser_postfix_expression (cp_parser
can be used in constant-expressions. */
if (!cast_valid_in_integral_constant_expression_p (type)
&& cp_parser_non_integral_constant_expression (parser, NIC_CAST))
- return error_mark_node;
+ {
+ postfix_expression = error_mark_node;
+ break;
+ }
switch (keyword)
{
@@ -6521,7 +6524,7 @@ cp_parser_postfix_expression (cp_parser
parser->type_definition_forbidden_message = saved_message;
/* `typeid' may not appear in an integral constant expression. */
if (cp_parser_non_integral_constant_expression (parser, NIC_TYPEID))
- return error_mark_node;
+ postfix_expression = error_mark_node;
}
break;
@@ -6614,7 +6617,10 @@ cp_parser_postfix_expression (cp_parser
/*cast_p=*/false, /*allow_expansion_p=*/true,
/*non_constant_p=*/NULL);
if (vec == NULL)
- return error_mark_node;
+ {
+ postfix_expression = error_mark_node;
+ break;
+ }
FOR_EACH_VEC_ELT (*vec, i, p)
mark_exp_read (p);
@@ -6623,25 +6629,37 @@ cp_parser_postfix_expression (cp_parser
{
case RID_ADDRESSOF:
if (vec->length () == 1)
- return cp_build_addressof (loc, (*vec)[0], tf_warning_or_error);
- error_at (loc, "wrong number of arguments to "
- "%<__builtin_addressof%>");
- return error_mark_node;
+ postfix_expression = cp_build_addressof (loc, (*vec)[0],
+ tf_warning_or_error);
+ else
+ {
+ error_at (loc, "wrong number of arguments to "
+ "%<__builtin_addressof%>");
+ postfix_expression = error_mark_node;
+ }
+ break;
case RID_BUILTIN_SHUFFLE:
if (vec->length () == 2)
- return build_x_vec_perm_expr (loc, (*vec)[0], NULL_TREE,
- (*vec)[1], tf_warning_or_error);
+ postfix_expression
+ = build_x_vec_perm_expr (loc, (*vec)[0], NULL_TREE,
+ (*vec)[1], tf_warning_or_error);
else if (vec->length () == 3)
- return build_x_vec_perm_expr (loc, (*vec)[0], (*vec)[1],
- (*vec)[2], tf_warning_or_error);
- error_at (loc, "wrong number of arguments to "
- "%<__builtin_shuffle%>");
- return error_mark_node;
+ postfix_expression
+ = build_x_vec_perm_expr (loc, (*vec)[0], (*vec)[1],
+ (*vec)[2], tf_warning_or_error);
+ else
+ {
+ error_at (loc, "wrong number of arguments to "
+ "%<__builtin_shuffle%>");
+ postfix_expression = error_mark_node;
+ }
+ break;
default:
gcc_unreachable ();
}
+ break;
}
default:
--- gcc/testsuite/c-c++-common/builtin-shuffle-1.c.jj 2016-10-24
09:37:45.161340576 +0200
+++ gcc/testsuite/c-c++-common/builtin-shuffle-1.c 2016-10-24
09:44:35.804156775 +0200
@@ -0,0 +1,22 @@
+/* PR c++/78089 */
+/* { dg-do run } */
+
+typedef int V __attribute__((vector_size (16)));
+V a, b, c;
+
+int
+foo ()
+{
+ return __builtin_shuffle (a, b, c)[3];
+}
+
+int
+main ()
+{
+ a = (V) { 1, 2, 3, 4 };
+ b = (V) { 5, 6, 7, 8 };
+ c = (V) { 7, 2, 5, 6 };
+ if (foo () != 7)
+ __builtin_abort ();
+ return 0;
+}
--- gcc/testsuite/g++.dg/cpp0x/addressof3.C.jj 2016-10-24 09:47:24.175031324
+0200
+++ gcc/testsuite/g++.dg/cpp0x/addressof3.C 2016-10-24 09:50:36.000000000
+0200
@@ -0,0 +1,9 @@
+// { dg-do compile }
+
+struct S { int foo (); int s; };
+int a[10];
+int b;
+S c;
+int d = __builtin_addressof (a)[0][0];
+int e = __builtin_addressof (b)[0];
+int f = __builtin_addressof (c)->foo ();
Jakub
