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LibSQL: Support 64-bit integer values and handle overflow errors

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Currently, integers are stored in LibSQL as 32-bit signed integers, even
if the provided type is unsigned. This resulted in a series of unchecked
unsigned-to-signed conversions, and prevented storing 64-bit values.
Further, mathematical operations were performed without similar checks,
and without checking for overflow.

This changes SQL::Value to behave like SQLite for INTEGER types. In
SQLite, the INTEGER type does not imply a size or signedness of the
underlying type. Instead, SQLite determines on-the-fly what type is
needed as values are created and updated.

To do so, the SQL::Value variant can now hold an i64 or u64 integer. If
a specific type is requested, invalid conversions are now explictly an
error (e.g. converting a stored -1 to a u64 will fail). When binary
mathematical operations are performed, we now try to coerce the RHS
value to a type that works with the LHS value, failing the operation if
that isn't possible. Any overflow or invalid operation (e.g. bitshifting
a 64-bit value by more than 64 bytes) is an error.
This commit is contained in:
Timothy Flynn
2022-12-11 11:44:11 -05:00
committed by Tim Flynn
parent a1007c37a4
commit 72e41a7dbd
Notes: sideshowbarker 2024-07-17 03:15:15 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/72e41a7dbd
Pull-request: https://github.com/SerenityOS/serenity/pull/16427
Reviewed-by: https://github.com/davidot ✅
13 changed files with 1241 additions and 283 deletions
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2
Userland/Libraries/LibSQL/Database.cpp
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@@ -165,7 +165,7 @@ ResultOr<NonnullRefPtr<TableDef>> Database::get_table(DeprecatedString const& sc
auto table_hash = table_def->hash();
auto column_key = ColumnDef::make_key(table_def);
for (auto it = m_table_columns->find(column_key); !it.is_end() && ((*it)["table_hash"].to_u32().value() == table_hash); ++it)
for (auto it = m_table_columns->find(column_key); !it.is_end() && ((*it)["table_hash"].to_int<u32>() == table_hash); ++it)
table_def->append_column(*it);
return table_def;