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Fix possible race condition with struct offsets

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This commit is contained in:
gingerBill
2025-08-05 12:27:28 +01:00
parent c910b5e583
commit 7f194080e6
2 changed files with 17 additions and 9 deletions
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src/types.cpp
+12 -8
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@@ -152,10 +152,11 @@ struct TypeStruct {
bool is_polymorphic;
bool are_offsets_set : 1;
bool are_offsets_being_processed : 1;
bool is_packed : 1;
bool is_raw_union : 1;
bool is_poly_specialized : 1;
std::atomic<bool> are_offsets_being_processed;
};
struct TypeUnion {
@@ -4099,18 +4100,18 @@ gb_internal bool type_set_offsets(Type *t) {
if (t->kind == Type_Struct) {
MUTEX_GUARD(&t->Struct.offset_mutex);
if (!t->Struct.are_offsets_set) {
t->Struct.are_offsets_being_processed = true;
t->Struct.are_offsets_being_processed.store(true);
t->Struct.offsets = type_set_offsets_of(t->Struct.fields, t->Struct.is_packed, t->Struct.is_raw_union, t->Struct.custom_min_field_align, t->Struct.custom_max_field_align);
t->Struct.are_offsets_being_processed = false;
t->Struct.are_offsets_being_processed.store(false);
t->Struct.are_offsets_set = true;
return true;
}
} else if (is_type_tuple(t)) {
MUTEX_GUARD(&t->Tuple.mutex);
if (!t->Tuple.are_offsets_set) {
t->Tuple.are_offsets_being_processed = true;
t->Tuple.are_offsets_being_processed.store(true);
t->Tuple.offsets = type_set_offsets_of(t->Tuple.variables, t->Tuple.is_packed, false, 1, 0);
t->Tuple.are_offsets_being_processed = false;
t->Tuple.are_offsets_being_processed.store(false);
t->Tuple.are_offsets_set = true;
return true;
}
@@ -4293,9 +4294,12 @@ gb_internal i64 type_size_of_internal(Type *t, TypePath *path) {
if (path->failure) {
return FAILURE_SIZE;
}
if (t->Struct.are_offsets_being_processed && t->Struct.offsets == nullptr) {
type_path_print_illegal_cycle(path, path->path.count-1);
return FAILURE_SIZE;
{
MUTEX_GUARD(&t->Struct.offset_mutex);
if (t->Struct.are_offsets_being_processed.load() && t->Struct.offsets == nullptr) {
type_path_print_illegal_cycle(path, path->path.count-1);
return FAILURE_SIZE;
}
}
type_set_offsets(t);
GB_ASSERT(t->Struct.fields.count == 0 || t->Struct.offsets != nullptr);