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Improve error handling with assignments to bit_field using constants

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gingerBill
2024-02-22 18:47:43 +00:00
parent afcc2889ec
commit fd987b29ff
1 changed files with 35 additions and 13 deletions
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48
src/check_expr.cpp
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@@ -1886,33 +1886,55 @@ gb_internal bool check_representable_as_constant(CheckerContext *c, ExactValue i
BigInt i = v.value_integer;
i64 bit_size = type_size_of(type);
i64 byte_size = type_size_of(type);
BigInt umax = {};
BigInt imin = {};
BigInt imax = {};
if (bit_size < 16) {
big_int_from_u64(&umax, unsigned_integer_maxs[bit_size]);
big_int_from_i64(&imin, signed_integer_mins[bit_size]);
big_int_from_i64(&imax, signed_integer_maxs[bit_size]);
} else {
if (c->bit_field_bit_size > 0) {
i64 bit_size = gb_min(cast(i64)(8*byte_size), cast(i64)c->bit_field_bit_size);
big_int_from_u64(&umax, 1);
big_int_from_i64(&imin, 1);
big_int_from_i64(&imax, 1);
BigInt bi128 = {};
BigInt bi127 = {};
big_int_from_i64(&bi128, 128);
big_int_from_i64(&bi127, 127);
BigInt bu = {};
BigInt bi = {};
big_int_from_i64(&bu, bit_size);
big_int_from_i64(&bi, bit_size-1);
big_int_shl_eq(&umax, &bi128);
big_int_shl_eq(&umax, &bu);
mp_decr(&umax);
big_int_shl_eq(&imin, &bi127);
big_int_shl_eq(&imin, &bi);
big_int_neg(&imin, &imin);
big_int_shl_eq(&imax, &bi127);
big_int_shl_eq(&imax, &bi);
mp_decr(&imax);
} else {
if (byte_size < 16) {
big_int_from_u64(&umax, unsigned_integer_maxs[byte_size]);
big_int_from_i64(&imin, signed_integer_mins[byte_size]);
big_int_from_i64(&imax, signed_integer_maxs[byte_size]);
} else {
big_int_from_u64(&umax, 1);
big_int_from_i64(&imin, 1);
big_int_from_i64(&imax, 1);
BigInt bi128 = {};
BigInt bi127 = {};
big_int_from_i64(&bi128, 128);
big_int_from_i64(&bi127, 127);
big_int_shl_eq(&umax, &bi128);
mp_decr(&umax);
big_int_shl_eq(&imin, &bi127);
big_int_neg(&imin, &imin);
big_int_shl_eq(&imax, &bi127);
mp_decr(&imax);
}
}
switch (type->Basic.kind) {