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Fix #2160 (deep subtyping through using of _)

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gingerBill
2022-11-01 13:14:20 +00:00
parent 411c0add3b
commit 2b7ca2bdd6
2 changed files with 63 additions and 26 deletions
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38
src/types.cpp
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@@ -2526,6 +2526,44 @@ String lookup_subtype_polymorphic_field(Type *dst, Type *src) {
return str_lit("");
}
bool lookup_subtype_polymorphic_selection(Type *dst, Type *src, Selection *sel) {
Type *prev_src = src;
// Type *prev_dst = dst;
src = base_type(type_deref(src));
// dst = base_type(type_deref(dst));
bool src_is_ptr = src != prev_src;
// bool dst_is_ptr = dst != prev_dst;
GB_ASSERT(is_type_struct(src) || is_type_union(src));
for_array(i, src->Struct.fields) {
Entity *f = src->Struct.fields[i];
if (f->kind == Entity_Variable && f->flags & EntityFlags_IsSubtype) {
if (are_types_identical(dst, f->type)) {
array_add(&sel->index, cast(i32)i);
sel->entity = f;
return true;
}
if (src_is_ptr && is_type_pointer(dst)) {
if (are_types_identical(type_deref(dst), f->type)) {
array_add(&sel->index, cast(i32)i);
sel->indirect = true;
sel->entity = f;
return true;
}
}
if ((f->flags & EntityFlag_Using) != 0 && is_type_struct(f->type)) {
String name = lookup_subtype_polymorphic_field(dst, f->type);
if (name.len > 0) {
array_add(&sel->index, cast(i32)i);
return lookup_subtype_polymorphic_selection(dst, f->type, sel);
}
}
}
}
return false;
}
Type *strip_type_aliasing(Type *x) {