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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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51
src/llvm_backend_expr.cpp
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@@ -1952,34 +1952,33 @@ lbValue lb_emit_conv(lbProcedure *p, lbValue value, Type *t) {
Type *dt = t;
GB_ASSERT(is_type_struct(st) || is_type_raw_union(st));
String field_name = lookup_subtype_polymorphic_field(t, src_type);
if (field_name.len > 0) {
// NOTE(bill): It can be casted
Selection sel = lookup_field(st, field_name, false, true);
if (sel.entity != nullptr) {
if (st_is_ptr) {
lbValue res = lb_emit_deep_field_gep(p, value, sel);
Type *rt = res.type;
if (!are_types_identical(rt, dt) && are_types_identical(type_deref(rt), dt)) {
res = lb_emit_load(p, res);
}
return res;
} else {
if (is_type_pointer(value.type)) {
Type *rt = value.type;
if (!are_types_identical(rt, dt) && are_types_identical(type_deref(rt), dt)) {
value = lb_emit_load(p, value);
} else {
value = lb_emit_deep_field_gep(p, value, sel);
return lb_emit_load(p, value);
}
}
return lb_emit_deep_field_ev(p, value, sel);
Selection sel = {};
sel.index.allocator = heap_allocator();
defer (array_free(&sel.index));
if (lookup_subtype_polymorphic_selection(t, src_type, &sel)) {
if (sel.entity == nullptr) {
GB_PANIC("invalid subtype cast %s -> ", type_to_string(src_type), type_to_string(t));
}
if (st_is_ptr) {
lbValue res = lb_emit_deep_field_gep(p, value, sel);
Type *rt = res.type;
if (!are_types_identical(rt, dt) && are_types_identical(type_deref(rt), dt)) {
res = lb_emit_load(p, res);
}
return res;
} else {
GB_PANIC("invalid subtype cast %s.%.*s", type_to_string(src_type), LIT(field_name));
if (is_type_pointer(value.type)) {
Type *rt = value.type;
if (!are_types_identical(rt, dt) && are_types_identical(type_deref(rt), dt)) {
value = lb_emit_load(p, value);
} else {
value = lb_emit_deep_field_gep(p, value, sel);
return lb_emit_load(p, value);
}
}
return lb_emit_deep_field_ev(p, value, sel);
}
}
}