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Add hidden __tag for union variables.

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Ginger Bill
2017-05-04 20:34:50 +01:00
parent 3b25f924cb
commit 789b297f32
10 changed files with 205 additions and 134 deletions
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src/check_expr.c
+6
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@@ -422,6 +422,8 @@ isize check_fields(Checker *c, AstNode *node, AstNodeArray decls,
e->identifier = name;
if (str_eq(name_token.string, str_lit("_"))) {
fields[field_index++] = e;
} else if (str_eq(name_token.string, str_lit("__tag"))) {
error_node(name, "`__tag` is a reserved identifier for fields");
} else {
HashKey key = hash_string(name_token.string);
Entity **found = map_entity_get(&entity_map, key);
@@ -660,6 +662,10 @@ void check_union_type(Checker *c, Type *union_type, AstNode *node) {
union_type->Record.field_count = field_count;
union_type->Record.are_offsets_set = false;
union_type->Record.is_ordered = true;
{
Entity *__tag = make_entity_field(c->allocator, NULL, make_token_ident(str_lit("__tag")), t_int, false, -1);
union_type->Record.union__tag = __tag;
}
for_array(i, ut->variants) {
AstNode *variant = ut->variants.e[i];