From 2b5baaef0b6e4d1d8e36cda091be26649163ffdb Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Sat, 16 Jul 2022 16:29:38 -0700 Subject: [PATCH] go: fix f().x where f returns zero-sized type Test case is https://go.dev/cl/417874. Fixes golang/go#23870 * go-gcc.cc (Gcc_backend::struct_field_expression): Handle a void expression, as for f().x where f returns a zero-sized type. --- gcc/go/go-gcc.cc | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/gcc/go/go-gcc.cc b/gcc/go/go-gcc.cc index 7b4b2adb058..1ba7206caeb 100644 --- a/gcc/go/go-gcc.cc +++ b/gcc/go/go-gcc.cc @@ -1707,6 +1707,13 @@ Gcc_backend::struct_field_expression(Bexpression* bstruct, size_t index, if (struct_tree == error_mark_node || TREE_TYPE(struct_tree) == error_mark_node) return this->error_expression(); + + // A function call that returns a zero-sized object will have been + // changed to return void. A zero-sized object can have a + // (zero-sized) field, so support that case. + if (TREE_TYPE(struct_tree) == void_type_node) + return bstruct; + gcc_assert(TREE_CODE(TREE_TYPE(struct_tree)) == RECORD_TYPE); tree field = TYPE_FIELDS(TREE_TYPE(struct_tree)); if (field == NULL_TREE) -- 2.47.2