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go: fix f().x where f returns zero-sized type

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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.
This commit is contained in:
Ian Lance Taylor
2022-07-16 16:29:38 -07:00
parent d6d8e6a7e1
commit 2b5baaef0b
1 changed files with 7 additions and 0 deletions
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gcc/go/go-gcc.cc
+7
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@@ -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)