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/// The type discriminant returned by `mono_type_get_type`, corresponding to `MonoTypeEnum` in the
/// Mono source (`mono/metadata/metadata.h`).
///
/// Annotated with `#[non_exhaustive]` so that adding named variants in the future is not a
/// breaking change. The `Other` variant covers any discriminant not yet named here.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
#[non_exhaustive]
pub enum TypeKind {
/// `MONO_TYPE_END` (0x00) — internal sentinel.
End,
/// `MONO_TYPE_VOID` (0x01)
Void,
/// `MONO_TYPE_BOOLEAN` (0x02)
Boolean,
/// `MONO_TYPE_CHAR` (0x03)
Char,
/// `MONO_TYPE_I1` (0x04) — `sbyte`
I1,
/// `MONO_TYPE_U1` (0x05) — `byte`
U1,
/// `MONO_TYPE_I2` (0x06) — `short`
I2,
/// `MONO_TYPE_U2` (0x07) — `ushort`
U2,
/// `MONO_TYPE_I4` (0x08) — `int`
I4,
/// `MONO_TYPE_U4` (0x09) — `uint`
U4,
/// `MONO_TYPE_I8` (0x0a) — `long`
I8,
/// `MONO_TYPE_U8` (0x0b) — `ulong`
U8,
/// `MONO_TYPE_R4` (0x0c) — `float`
R4,
/// `MONO_TYPE_R8` (0x0d) — `double`
R8,
/// `MONO_TYPE_STRING` (0x0e)
String,
/// `MONO_TYPE_PTR` (0x0f) — unmanaged pointer
Ptr,
/// `MONO_TYPE_BYREF` (0x10) — by-reference parameter
ByRef,
/// `MONO_TYPE_VALUETYPE` (0x11) — value type / struct
ValueType,
/// `MONO_TYPE_CLASS` (0x12) — reference type
Class,
/// `MONO_TYPE_VAR` (0x13) — generic type parameter (`T`)
Var,
/// `MONO_TYPE_ARRAY` (0x14) — multi-dimensional array
Array,
/// `MONO_TYPE_GENERICINST` (0x15) — instantiated generic type
GenericInst,
/// `MONO_TYPE_TYPEDBYREF` (0x16) — `TypedReference`
TypedByRef,
/// `MONO_TYPE_I` (0x18) — `nint`
I,
/// `MONO_TYPE_U` (0x19) — `nuint`
U,
/// `MONO_TYPE_FNPTR` (0x1b) — function pointer
FnPtr,
/// `MONO_TYPE_OBJECT` (0x1c) — `System.Object`
Object,
/// `MONO_TYPE_SZARRAY` (0x1d) — single-dimension zero-based array (most C# arrays)
SzArray,
/// `MONO_TYPE_MVAR` (0x1e) — generic method parameter (`M`)
MVar,
/// Any discriminant not covered by the named variants above.
Other(u32),
}
#[allow(clippy::too_many_lines)]
impl From<u32> for TypeKind {
fn from(v: u32) -> Self {
match v {
0x00 => Self::End,
0x01 => Self::Void,
0x02 => Self::Boolean,
0x03 => Self::Char,
0x04 => Self::I1,
0x05 => Self::U1,
0x06 => Self::I2,
0x07 => Self::U2,
0x08 => Self::I4,
0x09 => Self::U4,
0x0a => Self::I8,
0x0b => Self::U8,
0x0c => Self::R4,
0x0d => Self::R8,
0x0e => Self::String,
0x0f => Self::Ptr,
0x10 => Self::ByRef,
0x11 => Self::ValueType,
0x12 => Self::Class,
0x13 => Self::Var,
0x14 => Self::Array,
0x15 => Self::GenericInst,
0x16 => Self::TypedByRef,
0x18 => Self::I,
0x19 => Self::U,
0x1b => Self::FnPtr,
0x1c => Self::Object,
0x1d => Self::SzArray,
0x1e => Self::MVar,
other => Self::Other(other),
}
}
}
#[cfg(test)]
mod tests {
use std::collections::HashSet;
use super::TypeKind;
fn check(cases: &[(u32, TypeKind)]) {
for &(raw, ref expected) in cases {
assert_eq!(TypeKind::from(raw), *expected, "discriminant 0x{raw:02x}");
}
}
#[test]
fn primitive_variants_map_correctly() {
check(&[
(0x00, TypeKind::End),
(0x01, TypeKind::Void),
(0x02, TypeKind::Boolean),
(0x03, TypeKind::Char),
(0x04, TypeKind::I1),
(0x05, TypeKind::U1),
(0x06, TypeKind::I2),
(0x07, TypeKind::U2),
(0x08, TypeKind::I4),
(0x09, TypeKind::U4),
(0x0a, TypeKind::I8),
(0x0b, TypeKind::U8),
(0x0c, TypeKind::R4),
(0x0d, TypeKind::R8),
]);
}
#[test]
fn reference_and_generic_variants_map_correctly() {
check(&[
(0x0e, TypeKind::String),
(0x0f, TypeKind::Ptr),
(0x10, TypeKind::ByRef),
(0x11, TypeKind::ValueType),
(0x12, TypeKind::Class),
(0x13, TypeKind::Var),
(0x14, TypeKind::Array),
(0x15, TypeKind::GenericInst),
(0x16, TypeKind::TypedByRef),
(0x18, TypeKind::I),
(0x19, TypeKind::U),
(0x1b, TypeKind::FnPtr),
(0x1c, TypeKind::Object),
(0x1d, TypeKind::SzArray),
(0x1e, TypeKind::MVar),
]);
}
#[test]
fn gap_discriminants_produce_other() {
// 0x17 and 0x1a are intentional gaps in the MONO_TYPE_* numbering
assert_eq!(TypeKind::from(0x17), TypeKind::Other(0x17));
assert_eq!(TypeKind::from(0x1a), TypeKind::Other(0x1a));
}
#[test]
fn high_discriminant_produces_other() {
assert_eq!(TypeKind::from(0xFF), TypeKind::Other(0xFF));
assert_eq!(TypeKind::from(100), TypeKind::Other(100));
}
#[test]
fn other_variants_equality_uses_inner_value() {
assert_eq!(TypeKind::Other(7), TypeKind::Other(7));
assert_ne!(TypeKind::Other(7), TypeKind::Other(8));
}
#[test]
fn type_kind_is_hashable() {
let mut set = HashSet::new();
set.insert(TypeKind::I4);
set.insert(TypeKind::I4);
set.insert(TypeKind::U4);
assert_eq!(set.len(), 2);
}
#[test]
fn type_kind_is_copy() {
let a = TypeKind::Boolean;
let b = a;
// both are usable after copy
assert_eq!(a, b);
}
#[test]
fn type_kind_debug_contains_variant_name() {
assert!(format!("{:?}", TypeKind::I4).contains("I4"));
assert!(format!("{:?}", TypeKind::Other(99)).contains("Other"));
}
}