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Constant evaluation for in expression for bit_sets

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gingerBill
2018-08-16 00:07:26 +01:00
parent 042550cf87
commit 85ac95f81b
2 changed files with 19 additions and 1 deletions
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16
src/check_expr.cpp
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@@ -2041,6 +2041,22 @@ void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, bool use_lhs_as
} else if (is_type_bit_set(y->type)) {
Type *yt = base_type(y->type);
check_assignment(c, x, yt->BitSet.base, str_lit("bit_set 'in'"));
if (x->mode == Addressing_Constant && y->mode == Addressing_Constant) {
ExactValue k = exact_value_to_integer(x->value);
ExactValue v = exact_value_to_integer(y->value);
GB_ASSERT(k.kind == ExactValue_Integer);
GB_ASSERT(v.kind == ExactValue_Integer);
i64 bit = 1ll<<big_int_to_i64(&k.value_integer);
i64 bits = big_int_to_i64(&v.value_integer);
x->mode = Addressing_Constant;
x->type = t_untyped_bool;
x->value = exact_value_bool((bit & bits) != 0);
x->expr = node;
return;
}
} else {
gbString t = type_to_string(y->type);
error(x->expr, "expected either a map or bitset for 'in', got %s", t);