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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
13 changed files with 1241 additions and 283 deletions
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87
Userland/Libraries/LibSQL/Value.h
View file

@ -7,6 +7,7 @@
#pragma once
#include <AK/Checked.h>
#include <AK/DeprecatedString.h>
#include <AK/Format.h>
#include <AK/Optional.h>
@ -17,58 +18,107 @@
#include <LibSQL/Forward.h>
#include <LibSQL/Result.h>
#include <LibSQL/Type.h>
#include <math.h>
namespace SQL {
template<typename T>
concept Boolean = SameAs<RemoveCVReference<T>, bool>;
template<typename T>
concept Integer = (Integral<T> && !Boolean<T>);
/**
* A `Value` is an atomic piece of SQL data`. A `Value` has a basic type
* (Text/String, Integer, Float, etc). Richer types are implemented in higher
* level layers, but the resulting data is stored in these `Value` objects.
*/
class Value {
template<Integer T>
using IntegerType = Conditional<IsSigned<T>, i64, u64>;
public:
explicit Value(SQLType sql_type = SQLType::Null);
explicit Value(DeprecatedString);
explicit Value(int);
explicit Value(u32);
explicit Value(double);
Value(Value const&);
Value(Value&&);
~Value();
static ResultOr<Value> create_tuple(NonnullRefPtr<TupleDescriptor>);
static ResultOr<Value> create_tuple(Vector<Value>);
explicit Value(Integer auto value)
: m_type(SQLType::Integer)
, m_value(static_cast<IntegerType<decltype(value)>>(value))
{
}
template<typename T>
requires(SameAs<RemoveCVReference<T>, bool>) explicit Value(T value)
explicit Value(Boolean auto value)
: m_type(SQLType::Boolean)
, m_value(value)
{
}
static ResultOr<Value> create_tuple(NonnullRefPtr<TupleDescriptor>);
static ResultOr<Value> create_tuple(Vector<Value>);
[[nodiscard]] SQLType type() const;
[[nodiscard]] StringView type_name() const;
[[nodiscard]] bool is_type_compatible_with(SQLType) const;
[[nodiscard]] bool is_null() const;
[[nodiscard]] bool is_int() const;
[[nodiscard]] auto const& value() const
{
VERIFY(m_value.has_value());
return *m_value;
}
[[nodiscard]] DeprecatedString to_deprecated_string() const;
[[nodiscard]] Optional<int> to_int() const;
[[nodiscard]] Optional<u32> to_u32() const;
[[nodiscard]] Optional<double> to_double() const;
[[nodiscard]] Optional<bool> to_bool() const;
[[nodiscard]] Optional<Vector<Value>> to_vector() const;
template<Integer T>
[[nodiscard]] Optional<T> to_int() const
{
if (is_null())
return {};
return m_value->visit(
[](DeprecatedString const& value) -> Optional<T> {
if constexpr (IsSigned<T>)
return value.to_int<T>();
else
return value.to_uint<T>();
},
[](Integer auto value) -> Optional<T> {
if (!AK::is_within_range<T>(value))
return {};
return static_cast<T>(value);
},
[](double value) -> Optional<T> {
if (!AK::is_within_range<T>(value))
return {};
return static_cast<T>(round(value));
},
[](bool value) -> Optional<T> { return static_cast<T>(value); },
[](TupleValue const&) -> Optional<T> { return {}; });
}
Value& operator=(Value);
Value& operator=(DeprecatedString);
Value& operator=(int);
Value& operator=(u32);
Value& operator=(double);
Value& operator=(Integer auto value)
{
m_type = SQLType::Integer;
m_value = static_cast<IntegerType<decltype(value)>>(value);
return *this;
}
ResultOr<void> assign_tuple(NonnullRefPtr<TupleDescriptor>);
ResultOr<void> assign_tuple(Vector<Value>);
template<typename T>
requires(SameAs<RemoveCVReference<T>, bool>) Value& operator=(T value)
Value& operator=(Boolean auto value)
{
m_type = SQLType::Boolean;
m_value = value;
@ -83,9 +133,14 @@ public:
[[nodiscard]] int compare(Value const&) const;
bool operator==(Value const&) const;
bool operator==(StringView) const;
bool operator==(int) const;
bool operator==(u32) const;
bool operator==(double) const;
template<Integer T>
bool operator==(T value)
{
return to_int<T>() == value;
}
bool operator!=(Value const&) const;
bool operator<(Value const&) const;
bool operator<=(Value const&) const;
@ -97,10 +152,12 @@ public:
ResultOr<Value> multiply(Value const&) const;
ResultOr<Value> divide(Value const&) const;
ResultOr<Value> modulo(Value const&) const;
ResultOr<Value> negate() const;
ResultOr<Value> shift_left(Value const&) const;
ResultOr<Value> shift_right(Value const&) const;
ResultOr<Value> bitwise_or(Value const&) const;
ResultOr<Value> bitwise_and(Value const&) const;
ResultOr<Value> bitwise_not() const;
[[nodiscard]] TupleElementDescriptor descriptor() const;
@ -112,7 +169,7 @@ private:
Vector<Value> values;
};
using ValueType = Variant<DeprecatedString, int, double, bool, TupleValue>;
using ValueType = Variant<DeprecatedString, i64, u64, double, bool, TupleValue>;
static ResultOr<NonnullRefPtr<TupleDescriptor>> infer_tuple_descriptor(Vector<Value> const& values);
Value(NonnullRefPtr<TupleDescriptor> descriptor, Vector<Value> values);