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Copy pathcheck_type.cpp
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3856 lines (3356 loc) · 119 KB
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gb_internal ParameterValue handle_parameter_value(CheckerContext *ctx, Type *in_type, Type **out_type_, Ast *expr, bool allow_caller_location);
gb_internal Type *determine_type_from_polymorphic(CheckerContext *ctx, Type *poly_type, Operand const &operand);
gb_internal Type *check_get_params(CheckerContext *ctx, Scope *scope, Ast *_params, bool *is_variadic_, isize *variadic_index_, bool *success_, isize *specialization_count_, Array<Operand> const *operands);
gb_internal void populate_using_array_index(CheckerContext *ctx, Ast *node, AstField *field, Type *t, String name, i32 idx) {
t = base_type(t);
GB_ASSERT(t->kind == Type_Array);
Entity *e = scope_lookup_current(ctx->scope, name);
if (e != nullptr) {
gbString str = nullptr;
defer (gb_string_free(str));
if (node != nullptr) {
str = expr_to_string(node);
}
if (str != nullptr) {
error(e->token, "'%.*s' is already declared in '%s'", LIT(name), str);
} else {
error(e->token, "'%.*s' is already declared", LIT(name));
}
} else {
Token tok = make_token_ident(name);
if (field) {
if (field->names.count > 0) {
tok.pos = ast_token(field->names[0]).pos;
} else {
tok.pos = ast_token(field->type).pos;
}
}
Entity *f = alloc_entity_array_elem(nullptr, tok, t->Array.elem, idx);
add_entity(ctx, ctx->scope, nullptr, f);
}
}
gb_internal void populate_using_entity_scope(CheckerContext *ctx, Ast *node, AstField *field, Type *t, isize level) {
if (t == nullptr) {
return;
}
Type *original_type = t;
t = base_type(type_deref(t));
gbString str = nullptr;
defer (gb_string_free(str));
if (node != nullptr) {
str = expr_to_string(node);
}
if (t->kind == Type_Struct) {
for (Entity *f : t->Struct.fields) {
GB_ASSERT(f->kind == Entity_Variable);
String name = f->token.string;
Entity *e = scope_lookup_current(ctx->scope, name);
if (e != nullptr && name != "_") {
gbString ot = type_to_string(original_type);
// TODO(bill): Better type error
if (str != nullptr) {
error(e->token, "'%.*s' is already declared in '%s', through 'using' from '%s'", LIT(name), str, ot);
} else {
error(e->token, "'%.*s' is already declared, through 'using' from '%s'", LIT(name), ot);
}
gb_string_free(ot);
} else {
add_entity(ctx, ctx->scope, nullptr, f);
if (f->flags & EntityFlag_Using) {
populate_using_entity_scope(ctx, node, field, f->type, level+1);
}
}
}
} else if (t->kind == Type_Array && t->Array.count <= 4) {
switch (t->Array.count) {
case 4:
populate_using_array_index(ctx, node, field, t, str_lit("w"), 3);
populate_using_array_index(ctx, node, field, t, str_lit("a"), 3);
/*fallthrough*/
case 3:
populate_using_array_index(ctx, node, field, t, str_lit("z"), 2);
populate_using_array_index(ctx, node, field, t, str_lit("b"), 2);
/*fallthrough*/
case 2:
populate_using_array_index(ctx, node, field, t, str_lit("y"), 1);
populate_using_array_index(ctx, node, field, t, str_lit("g"), 1);
/*fallthrough*/
case 1:
populate_using_array_index(ctx, node, field, t, str_lit("x"), 0);
populate_using_array_index(ctx, node, field, t, str_lit("r"), 0);
/*fallthrough*/
default:
break;
}
}
}
gb_internal bool does_field_type_allow_using(Type *t) {
t = base_type(t);
if (is_type_struct(t)) {
return true;
} else if (is_type_array(t)) {
return t->Array.count <= 4;
} else if (is_type_bit_field(t)) {
return true;
}
return false;
}
gb_internal void check_struct_fields(CheckerContext *ctx, Ast *node, Slice<Entity *> *fields, String **tags, Slice<Ast *> const ¶ms,
isize init_field_capacity, Type *struct_type, String context) {
auto fields_array = array_make<Entity *>(heap_allocator(), 0, init_field_capacity);
auto tags_array = array_make<String>(heap_allocator(), 0, init_field_capacity);
GB_ASSERT(node->kind == Ast_StructType);
GB_ASSERT(struct_type->kind == Type_Struct);
isize variable_count = 0;
for_array(i, params) {
Ast *field = params[i];
if (ast_node_expect(field, Ast_Field)) {
ast_node(f, Field, field);
variable_count += gb_max(f->names.count, 1);
}
}
i32 field_src_index = 0;
i32 field_group_index = -1;
for_array(i, params) {
Ast *param = params[i];
if (param->kind != Ast_Field) {
continue;
}
field_group_index += 1;
ast_node(p, Field, param);
Ast *type_expr = p->type;
Type *type = nullptr;
CommentGroup *docs = p->docs;
CommentGroup *comment = p->comment;
if (type_expr != nullptr) {
type = check_type_expr(ctx, type_expr, nullptr);
if (is_type_polymorphic(type)) {
struct_type->Struct.is_polymorphic = true;
type = nullptr;
}
}
if (type == nullptr) {
error(params[i], "Invalid parameter type");
type = t_invalid;
}
if (is_type_untyped(type)) {
if (is_type_untyped_uninit(type)) {
error(params[i], "Cannot determine parameter type from ---");
} else {
error(params[i], "Cannot determine parameter type from a nil");
}
type = t_invalid;
}
bool is_using = (p->flags&FieldFlag_using) != 0;
bool is_subtype = (p->flags&FieldFlag_subtype) != 0;
for_array(j, p->names) {
Ast *name = p->names[j];
if (!ast_node_expect2(name, Ast_Ident, Ast_PolyType)) {
continue;
}
if (name->kind == Ast_PolyType) {
name = name->PolyType.type;
}
Token name_token = name->Ident.token;
Entity *field = alloc_entity_field(ctx->scope, name_token, type, is_using, field_src_index);
add_entity(ctx, ctx->scope, name, field);
field->Variable.field_group_index = field_group_index;
if (is_subtype) {
field->flags |= EntityFlag_Subtype;
}
if (j == 0) {
field->Variable.docs = docs;
}
if (j+1 == p->names.count) {
field->Variable.comment = comment;
}
array_add(&fields_array, field);
String tag = p->tag.string;
if (tag.len != 0 && !unquote_string(permanent_allocator(), &tag, 0, tag.text[0] == '`')) {
error(p->tag, "Invalid string literal");
tag = {};
}
array_add(&tags_array, tag);
field_src_index += 1;
}
if (is_using && p->names.count > 0) {
Type *first_type = fields_array[fields_array.count-1]->type;
bool soa_ptr = is_type_soa_pointer(first_type);
Type *t = base_type(type_deref(first_type));
if ((soa_ptr || !does_field_type_allow_using(t)) &&
p->names.count >= 1 &&
p->names[0]->kind == Ast_Ident) {
Token name_token = p->names[0]->Ident.token;
gbString type_str = type_to_string(first_type);
error(name_token, "'using' cannot be applied to the field '%.*s' of type '%s'", LIT(name_token.string), type_str);
gb_string_free(type_str);
continue;
}
populate_using_entity_scope(ctx, node, p, type, 1);
}
if (is_subtype && p->names.count > 0) {
Type *first_type = fields_array[fields_array.count-1]->type;
Type *t = base_type(type_deref(first_type));
if (!does_field_type_allow_using(t) &&
p->names.count >= 1 &&
p->names[0]->kind == Ast_Ident) {
Token name_token = p->names[0]->Ident.token;
gbString type_str = type_to_string(first_type);
error(name_token, "'subtype' cannot be applied to the field '%.*s' of type '%s'", LIT(name_token.string), type_str);
gb_string_free(type_str);
}
}
}
*fields = slice_from_array(fields_array);
*tags = tags_array.data;
}
gb_internal bool check_custom_align(CheckerContext *ctx, Ast *node, i64 *align_, char const *msg) {
GB_ASSERT(align_ != nullptr);
Operand o = {};
check_expr(ctx, &o, node);
if (o.mode != Addressing_Constant) {
if (o.mode != Addressing_Invalid) {
error(node, "#%s must be a constant", msg);
}
return false;
}
Type *type = base_type(o.type);
if (is_type_untyped(type) || is_type_integer(type)) {
if (o.value.kind == ExactValue_Integer) {
BigInt v = o.value.value_integer;
if (v.used > 1) {
gbAllocator a = heap_allocator();
String str = big_int_to_string(a, &v);
error(node, "#%s too large, %.*s", msg, LIT(str));
gb_free(a, str.text);
return false;
}
i64 align = big_int_to_i64(&v);
if (align < 1 || !gb_is_power_of_two(cast(isize)align)) {
error(node, "#%s must be a power of 2, got %lld", msg, align);
return false;
}
*align_ = align;
return true;
}
}
error(node, "#%s must be an integer", msg);
return false;
}
gb_internal GenTypesData *ensure_polymorphic_record_entity_has_gen_types(CheckerContext *ctx, Type *original_type) {
GenTypesData *found_gen_types = nullptr;
GB_ASSERT(original_type->kind == Type_Named);
mutex_lock(&original_type->Named.gen_types_data_mutex);
if (original_type->Named.gen_types_data == nullptr) {
GenTypesData *gen_types = gb_alloc_item(permanent_allocator(), GenTypesData);
gen_types->types = array_make<Entity *>(heap_allocator());
original_type->Named.gen_types_data = gen_types;
}
found_gen_types = original_type->Named.gen_types_data;
mutex_unlock(&original_type->Named.gen_types_data_mutex);
return found_gen_types;
}
gb_internal void add_polymorphic_record_entity(CheckerContext *ctx, Ast *node, Type *named_type, Type *original_type) {
GB_ASSERT(is_type_named(named_type));
GB_ASSERT(original_type->kind == Type_Named);
gbAllocator a = heap_allocator();
Scope *s = ctx->scope->parent;
AstPackage *pkg = nullptr;
if (original_type->Named.type_name && original_type->Named.type_name->pkg) {
pkg = original_type->Named.type_name->pkg;
}
if (pkg == nullptr) {
// NOTE(bill): if the `pkg` cannot be determined, default to the current context's pkg instead
pkg = ctx->pkg;
}
Entity *e = nullptr;
{
Token token = ast_token(node);
token.kind = Token_String;
token.string = named_type->Named.name;
Ast *node = ast_ident(nullptr, token);
e = alloc_entity_type_name(s, token, named_type);
e->state = EntityState_Resolved;
e->file = ctx->file;
e->pkg = pkg;
e->TypeName.original_type_for_parapoly = original_type;
add_entity_use(ctx, node, e);
}
named_type->Named.type_name = e;
e->TypeName.objc_class_name = original_type->Named.type_name->TypeName.objc_class_name;
// TODO(bill): Is this even correct? Or should the metadata be copied?
e->TypeName.objc_metadata = original_type->Named.type_name->TypeName.objc_metadata;
auto *found_gen_types = ensure_polymorphic_record_entity_has_gen_types(ctx, original_type);
mutex_lock(&found_gen_types->mutex);
defer (mutex_unlock(&found_gen_types->mutex));
for (Entity *prev : found_gen_types->types) {
if (prev == e) {
return;
}
}
array_add(&found_gen_types->types, e);
}
bool check_constant_parameter_value(Type *type, Ast *expr) {
if (!is_type_constant_type(type)) {
gbString str = type_to_string(type);
defer (gb_string_free(str));
error(expr, "A parameter must be a valid constant type, got %s", str);
return true;
}
return false;
}
gb_internal Type *check_record_polymorphic_params(CheckerContext *ctx, Ast *polymorphic_params,
bool *is_polymorphic_,
Array<Operand> *poly_operands) {
Type *polymorphic_params_type = nullptr;
GB_ASSERT(is_polymorphic_ != nullptr);
if (polymorphic_params == nullptr) {
if (!*is_polymorphic_) {
*is_polymorphic_ = polymorphic_params != nullptr && poly_operands == nullptr;
}
return polymorphic_params_type;
}
// bool is_variadic = false;
// isize variadic_index = 0;
// bool success = false;
// isize specialization_count = 0;
// polymorphic_params_type = check_get_params(ctx, ctx->scope, polymorphic_params, &is_variadic, &variadic_index, &success, &specialization_count, poly_operands);
// if (success) {
// return nullptr;
// }
bool can_check_fields = true;
ast_node(field_list, FieldList, polymorphic_params);
Slice<Ast *> params = field_list->list;
if (params.count != 0) {
isize variable_count = 0;
for_array(i, params) {
Ast *field = params[i];
if (ast_node_expect(field, Ast_Field)) {
ast_node(f, Field, field);
variable_count += gb_max(f->names.count, 1);
}
}
auto entities = array_make<Entity *>(permanent_allocator(), 0, variable_count);
i32 field_group_index = -1;
for_array(i, params) {
Ast *param = params[i];
if (param->kind != Ast_Field) {
continue;
}
field_group_index += 1;
ast_node(p, Field, param);
Ast *type_expr = p->type;
Ast *default_value = unparen_expr(p->default_value);
Type *type = nullptr;
bool is_type_param = false;
bool is_type_polymorphic_type = false;
Type *specialization = nullptr;
if (type_expr == nullptr && default_value == nullptr) {
error(param, "Expected a type for this parameter");
continue;
}
if (type_expr != nullptr) {
if (type_expr->kind == Ast_Ellipsis) {
type_expr = type_expr->Ellipsis.expr;
error(param, "A polymorphic parameter cannot be variadic");
}
if (type_expr->kind == Ast_TypeidType) {
is_type_param = true;
if (type_expr->TypeidType.specialization != nullptr) {
Ast *s = type_expr->TypeidType.specialization;
specialization = check_type(ctx, s);
}
type = alloc_type_generic(ctx->scope, 0, str_lit(""), specialization);
} else {
type = check_type(ctx, type_expr);
if (is_type_polymorphic(type)) {
is_type_polymorphic_type = true;
}
}
}
ParameterValue param_value = {};
if (default_value != nullptr) {
Type *out_type = nullptr;
param_value = handle_parameter_value(ctx, type, &out_type, default_value, false);
if (type == nullptr && out_type != nullptr) {
type = out_type;
}
if (param_value.kind != ParameterValue_Constant && param_value.kind != ParameterValue_Nil) {
error(default_value, "Invalid parameter value");
param_value = {};
}
}
if (type == nullptr) {
error(params[i], "Invalid parameter type");
type = t_invalid;
}
if (is_type_untyped(type)) {
if (is_type_untyped_uninit(type)) {
error(params[i], "Cannot determine parameter type from ---");
} else {
error(params[i], "Cannot determine parameter type from a nil");
}
type = t_invalid;
}
if (is_type_polymorphic_type && !is_type_proc(type)) {
gbString str = type_to_string(type);
error(params[i], "Parameter types cannot be polymorphic, got %s", str);
gb_string_free(str);
type = t_invalid;
}
if (!is_type_param && check_constant_parameter_value(type, params[i])) {
// failed
}
Scope *scope = ctx->scope;
for_array(j, p->names) {
Ast *name = p->names[j];
if (!ast_node_expect2(name, Ast_Ident, Ast_PolyType)) {
continue;
}
if (name->kind == Ast_PolyType) {
name = name->PolyType.type;
}
Entity *e = nullptr;
Token token = name->Ident.token;
if (poly_operands != nullptr) {
Operand operand = {};
operand.type = t_invalid;
if (entities.count < poly_operands->count) {
operand = (*poly_operands)[entities.count];
} else if (param_value.kind != ParameterValue_Invalid) {
operand.mode = Addressing_Constant;
operand.value = param_value.value;
}
if (is_type_param) {
if (is_type_polymorphic(base_type(operand.type))) {
*is_polymorphic_ = true;
can_check_fields = false;
} else if (specialization &&
!check_type_specialization_to(ctx, specialization, operand.type, false, /*modify_type*/true)) {
if (!ctx->no_polymorphic_errors) {
gbString t = type_to_string(operand.type);
gbString s = type_to_string(specialization);
error(operand.expr, "Cannot convert type '%s' to the specialization '%s'", t, s);
gb_string_free(s);
gb_string_free(t);
}
}
e = alloc_entity_type_name(scope, token, operand.type);
e->TypeName.is_type_alias = true;
e->flags |= EntityFlag_PolyConst;
} else {
Type *t = operand.type;
if (is_type_proc(type)) {
t = determine_type_from_polymorphic(ctx, type, operand);
}
if (is_type_polymorphic(base_type(t))) {
*is_polymorphic_ = true;
can_check_fields = false;
}
if (e == nullptr) {
e = alloc_entity_const_param(scope, token, t, operand.value, is_type_polymorphic(t));
e->Constant.param_value = param_value;
e->Constant.field_group_index = field_group_index;
}
}
} else {
if (is_type_param) {
e = alloc_entity_type_name(scope, token, type);
e->TypeName.is_type_alias = true;
e->flags |= EntityFlag_PolyConst;
} else {
e = alloc_entity_const_param(scope, token, type, param_value.value, is_type_polymorphic(type));
e->Constant.field_group_index = field_group_index;
e->Constant.param_value = param_value;
}
}
e->state = EntityState_Resolved;
add_entity(ctx, scope, name, e);
array_add(&entities, e);
}
}
if (entities.count > 0) {
Type *tuple = alloc_type_tuple();
tuple->Tuple.variables = slice_from_array(entities);
polymorphic_params_type = tuple;
}
}
if (!*is_polymorphic_) {
*is_polymorphic_ = polymorphic_params != nullptr && poly_operands == nullptr;
}
return polymorphic_params_type;
}
gb_internal bool check_record_poly_operand_specialization(CheckerContext *ctx, Type *record_type, Array<Operand> *poly_operands, bool *is_polymorphic_) {
if (poly_operands == nullptr) {
return false;
}
for (isize i = 0; i < poly_operands->count; i++) {
Operand o = (*poly_operands)[i];
if (is_type_polymorphic(o.type)) {
return false;
}
if (record_type == o.type) {
// NOTE(bill): Cycle
return false;
}
if (o.mode == Addressing_Type) {
// NOTE(bill): ANNOYING EDGE CASE FOR `where` clauses
// TODO(bill, 2021-03-27): Is this even a valid HACK?!
Entity *entity = entity_of_node(o.expr);
if (entity != nullptr &&
entity->kind == Entity_TypeName &&
entity->type == t_typeid) {
*is_polymorphic_ = true;
return false;
}
}
}
return true;
}
gb_internal Entity *find_polymorphic_record_entity(GenTypesData *found_gen_types, isize param_count, Array<Operand> const &ordered_operands) {
for (Entity *e : found_gen_types->types) {
Type *t = base_type(e->type);
TypeTuple *tuple = get_record_polymorphic_params(t);
GB_ASSERT_MSG(tuple != nullptr, "%s :: %s", type_to_string(e->type), type_to_string(t));
GB_ASSERT(param_count == tuple->variables.count);
bool skip = false;
for (isize j = 0; j < param_count; j++) {
Entity *p = tuple->variables[j];
Operand o = {};
if (j < ordered_operands.count) {
o = ordered_operands[j];
}
if (o.expr == nullptr) {
continue;
}
Entity *oe = entity_of_node(o.expr);
if (p == oe) {
// NOTE(bill): This is the same type, make sure that it will be be same thing and use that
// Saves on a lot of checking too below
continue;
}
if (p->kind == Entity_TypeName) {
if (is_type_polymorphic(o.type)) {
// NOTE(bill): Do not add polymorphic version to the gen_types
skip = true;
break;
}
if (!are_types_identical(o.type, p->type)) {
skip = true;
break;
}
} else if (p->kind == Entity_Constant) {
if (!compare_exact_values(Token_CmpEq, o.value, p->Constant.value)) {
skip = true;
break;
}
if (!are_types_identical(o.type, p->type)) {
skip = true;
break;
}
} else {
GB_PANIC("Unknown entity kind");
}
}
if (!skip) {
return e;
}
}
return nullptr;
};
gb_internal void check_struct_type(CheckerContext *ctx, Type *struct_type, Ast *node, Array<Operand> *poly_operands, Type *named_type, Type *original_type_for_poly) {
GB_ASSERT(is_type_struct(struct_type));
ast_node(st, StructType, node);
String context = str_lit("struct");
isize min_field_count = 0;
for_array(field_index, st->fields) {
Ast *field = st->fields[field_index];
switch (field->kind) {
case_ast_node(f, ValueDecl, field);
min_field_count += f->names.count;
case_end;
case_ast_node(f, Field, field);
min_field_count += f->names.count;
case_end;
}
}
scope_reserve(ctx->scope, min_field_count);
if (st->is_raw_union && min_field_count > 1) {
struct_type->Struct.is_raw_union = true;
context = str_lit("struct #raw_union");
}
struct_type->Struct.node = node;
struct_type->Struct.scope = ctx->scope;
struct_type->Struct.is_packed = st->is_packed;
struct_type->Struct.polymorphic_params = check_record_polymorphic_params(
ctx, st->polymorphic_params,
&struct_type->Struct.is_polymorphic,
poly_operands
);
wait_signal_set(&struct_type->Struct.polymorphic_wait_signal);
struct_type->Struct.is_poly_specialized = check_record_poly_operand_specialization(ctx, struct_type, poly_operands, &struct_type->Struct.is_polymorphic);
if (original_type_for_poly) {
GB_ASSERT(named_type != nullptr);
add_polymorphic_record_entity(ctx, node, named_type, original_type_for_poly);
}
if (!struct_type->Struct.is_polymorphic) {
if (st->where_clauses.count > 0 && st->polymorphic_params == nullptr) {
error(st->where_clauses[0], "'where' clauses can only be used on structures with polymorphic parameters");
} else {
bool where_clause_ok = evaluate_where_clauses(ctx, node, ctx->scope, &st->where_clauses, true);
gb_unused(where_clause_ok);
}
check_struct_fields(ctx, node, &struct_type->Struct.fields, &struct_type->Struct.tags, st->fields, min_field_count, struct_type, context);
wait_signal_set(&struct_type->Struct.fields_wait_signal);
}
#define ST_ALIGN(_name) if (st->_name != nullptr) { \
if (st->is_packed) { \
error(st->_name, "'#%s' cannot be applied with '#packed'", #_name); \
return; \
} \
i64 align = 1; \
if (check_custom_align(ctx, st->_name, &align, #_name)) { \
struct_type->Struct.custom_##_name = align; \
} \
}
ST_ALIGN(min_field_align);
ST_ALIGN(max_field_align);
ST_ALIGN(align);
if (struct_type->Struct.custom_align != 0 &&
struct_type->Struct.custom_align < struct_type->Struct.custom_min_field_align) {
error(st->align, "#align(%lld) is defined to be less than #min_field_align(%lld)",
cast(long long)struct_type->Struct.custom_align,
cast(long long)struct_type->Struct.custom_min_field_align);
}
if (struct_type->Struct.custom_max_field_align != 0 &&
struct_type->Struct.custom_align > struct_type->Struct.custom_max_field_align) {
error(st->align, "#align(%lld) is defined to be greater than #max_field_align(%lld)",
cast(long long)struct_type->Struct.custom_align,
cast(long long)struct_type->Struct.custom_max_field_align);
}
if (struct_type->Struct.custom_max_field_align != 0 &&
struct_type->Struct.custom_min_field_align > struct_type->Struct.custom_max_field_align) {
error(st->align, "#min_field_align(%lld) is defined to be greater than #max_field_align(%lld)",
cast(long long)struct_type->Struct.custom_min_field_align,
cast(long long)struct_type->Struct.custom_max_field_align);
i64 a = gb_min(struct_type->Struct.custom_min_field_align, struct_type->Struct.custom_max_field_align);
i64 b = gb_max(struct_type->Struct.custom_min_field_align, struct_type->Struct.custom_max_field_align);
// NOTE(bill): sort them to keep code consistent
struct_type->Struct.custom_min_field_align = a;
struct_type->Struct.custom_max_field_align = b;
}
#undef ST_ALIGN
}
gb_internal void check_union_type(CheckerContext *ctx, Type *union_type, Ast *node, Array<Operand> *poly_operands, Type *named_type, Type *original_type_for_poly) {
GB_ASSERT(is_type_union(union_type));
ast_node(ut, UnionType, node);
union_type->Union.node = node;
union_type->Union.scope = ctx->scope;
union_type->Union.polymorphic_params = check_record_polymorphic_params(
ctx, ut->polymorphic_params,
&union_type->Union.is_polymorphic,
poly_operands
);
wait_signal_set(&union_type->Union.polymorphic_wait_signal);
union_type->Union.is_poly_specialized = check_record_poly_operand_specialization(ctx, union_type, poly_operands, &union_type->Union.is_polymorphic);
if (original_type_for_poly) {
GB_ASSERT(named_type != nullptr);
add_polymorphic_record_entity(ctx, node, named_type, original_type_for_poly);
}
if (!union_type->Union.is_polymorphic) {
if (ut->where_clauses.count > 0 && ut->polymorphic_params == nullptr) {
error(ut->where_clauses[0], "'where' clauses can only be used on unions with polymorphic parameters");
} else {
bool where_clause_ok = evaluate_where_clauses(ctx, node, ctx->scope, &ut->where_clauses, true);
gb_unused(where_clause_ok);
}
}
auto variants = array_make<Type *>(permanent_allocator(), 0, ut->variants.count);
for_array(i, ut->variants) {
Ast *node = ut->variants[i];
Type *t = check_type_expr(ctx, node, nullptr);
if (union_type->Union.is_polymorphic && poly_operands == nullptr) {
// NOTE(bill): don't add any variants if this is this is an unspecialized polymorphic record
continue;
}
if (t != nullptr && t != t_invalid) {
bool ok = true;
t = default_type(t);
if (is_type_untyped(t) || is_type_empty_union(t)) {
ok = false;
gbString str = type_to_string(t);
error(node, "Invalid variant type in union '%s'", str);
gb_string_free(str);
} else {
for_array(j, variants) {
if (union_variant_index_types_equal(t, variants[j])) {
ok = false;
ERROR_BLOCK();
gbString str = type_to_string(t);
error(node, "Duplicate variant type '%s'", str);
if (j < ut->variants.count) {
error_line("\tPrevious found at %s\n", token_pos_to_string(ast_token(ut->variants[j]).pos));
}
gb_string_free(str);
break;
}
}
}
if (ok) {
array_add(&variants, t);
if (ut->kind == UnionType_shared_nil) {
if (!type_has_nil(t)) {
gbString s = type_to_string(t);
error(node, "Each variant of a union with #shared_nil must have a 'nil' value, got %s", s);
gb_string_free(s);
}
}
}
}
}
union_type->Union.variants = slice_from_array(variants);
union_type->Union.kind = ut->kind;
switch (ut->kind) {
case UnionType_no_nil:
if (union_type->Union.is_polymorphic && poly_operands == nullptr) {
GB_ASSERT(variants.count == 0);
if (ut->variants.count != 1) {
break;
}
}
if (variants.count < 2) {
error(node, "A union with #no_nil must have at least 2 variants");
}
break;
}
if (ut->align != nullptr) {
i64 custom_align = 1;
if (check_custom_align(ctx, ut->align, &custom_align, "align")) {
if (variants.count == 0) {
error(ut->align, "An empty union cannot have a custom alignment");
} else {
union_type->Union.custom_align = custom_align;
}
}
}
}
gb_internal void check_enum_type(CheckerContext *ctx, Type *enum_type, Type *named_type, Ast *node) {
ast_node(et, EnumType, node);
GB_ASSERT(is_type_enum(enum_type));
enum_type->Enum.base_type = t_int;
enum_type->Enum.scope = ctx->scope;
Type *base_type = t_int;
if (unparen_expr(et->base_type) != nullptr) {
base_type = check_type(ctx, et->base_type);
}
if (base_type == nullptr || base_type == t_invalid || !is_type_integer(base_type)) {
error(node, "Base type for enumeration must be an integer");
return;
}
if (is_type_enum(base_type)) {
error(node, "Base type for enumeration cannot be another enumeration");
return;
}
if (is_type_integer_128bit(base_type)) {
error(node, "Base type for enumeration cannot be a 128-bit integer");
return;
}
// NOTE(bill): Must be up here for the 'check_init_constant' system
enum_type->Enum.base_type = base_type;
auto fields = array_make<Entity *>(permanent_allocator(), 0, et->fields.count);
Type *constant_type = enum_type;
if (named_type != nullptr) {
constant_type = named_type;
}
ExactValue iota = exact_value_i64(-1);
ExactValue min_value = exact_value_i64(0);
ExactValue max_value = exact_value_i64(0);
isize min_value_index = 0;
isize max_value_index = 0;
bool min_value_set = false;
bool max_value_set = false;
scope_reserve(ctx->scope, et->fields.count);
for_array(i, et->fields) {
Ast *field = et->fields[i];
Ast *ident = nullptr;
Ast *init = nullptr;
u32 entity_flags = 0;
if (field->kind != Ast_EnumFieldValue) {
error(field, "An enum field's name must be an identifier");
continue;
}
ident = field->EnumFieldValue.name;
init = field->EnumFieldValue.value;
if (ident == nullptr || ident->kind != Ast_Ident) {
error(field, "An enum field's name must be an identifier");
continue;
}
CommentGroup *docs = field->EnumFieldValue.docs;
CommentGroup *comment = field->EnumFieldValue.comment;
String name = ident->Ident.token.string;
if (init != nullptr) {
Operand o = {};
check_expr(ctx, &o, init);
if (o.mode != Addressing_Constant) {
error(init, "Enumeration value must be a constant");
o.mode = Addressing_Invalid;
}
if (o.mode != Addressing_Invalid) {
check_assignment(ctx, &o, constant_type, str_lit("enumeration"));
}
if (o.mode != Addressing_Invalid) {
iota = o.value;
} else {
iota = exact_binary_operator_value(Token_Add, iota, exact_value_i64(1));
}
} else {
iota = exact_binary_operator_value(Token_Add, iota, exact_value_i64(1));
entity_flags |= EntityConstantFlag_ImplicitEnumValue;
}
// NOTE(bill): Skip blank identifiers
if (is_blank_ident(name)) {
continue;
} else if (name == "names") {
error(field, "'names' is a reserved identifier for enumerations");
continue;
}
if (min_value_set) {
if (compare_exact_values(Token_Gt, min_value, iota)) {
min_value_index = i;
min_value = iota;
}
} else {
min_value_index = i;
min_value = iota;
min_value_set = true;
}
if (max_value_set) {
if (compare_exact_values(Token_Lt, max_value, iota)) {
max_value_index = i;
max_value = iota;
}
} else {
max_value_index = i;
max_value = iota;
max_value_set = true;
}
Entity *e = alloc_entity_constant(ctx->scope, ident->Ident.token, constant_type, iota);
e->identifier = ident;
e->flags |= EntityFlag_Visited;
e->state = EntityState_Resolved;
e->Constant.flags |= entity_flags;
e->Constant.docs = docs;
e->Constant.comment = comment;
if (scope_lookup_current(ctx->scope, name) != nullptr) {
error(ident, "'%.*s' is already declared in this enumeration", LIT(name));
} else {
add_entity(ctx, ctx->scope, nullptr, e);
array_add(&fields, e);
// TODO(bill): Should I add a use for the enum value?
add_entity_use(ctx, field, e);
}
}
GB_ASSERT(fields.count <= et->fields.count);
enum_type->Enum.fields = fields;
*enum_type->Enum.min_value = min_value;
*enum_type->Enum.max_value = max_value;
enum_type->Enum.min_value_index = min_value_index;
enum_type->Enum.max_value_index = max_value_index;
}
gb_internal void check_bit_field_type(CheckerContext *ctx, Type *bit_field_type, Type *named_type, Ast *node) {
ast_node(bf, BitFieldType, node);
GB_ASSERT(is_type_bit_field(bit_field_type));
Type *backing_type = check_type(ctx, bf->backing_type);
bit_field_type->BitField.backing_type = backing_type ? backing_type : t_u8;
bit_field_type->BitField.scope = ctx->scope;
if (backing_type == nullptr) {
error(bf->backing_type, "Backing type for a bit_field must be an integer or an array of an integer");
return;
}
if (!is_valid_bit_field_backing_type(backing_type)) {
error(bf->backing_type, "Backing type for a bit_field must be an integer or an array of an integer");
return;
}
auto fields = array_make<Entity *>(permanent_allocator(), 0, bf->fields.count);
auto bit_sizes = array_make<u8> (permanent_allocator(), 0, bf->fields.count);
auto tags = array_make<String> (permanent_allocator(), 0, bf->fields.count);
u64 maximum_bit_size = 8 * type_size_of(backing_type);
u64 total_bit_size = 0;
for_array(i, bf->fields) {
i32 field_src_index = cast(i32)i;
Ast *field = bf->fields[i];