use crate::ir::immediates::{Ieee32, Ieee64, Offset32};
use crate::ir::{types, ConstantData, Type};
use core::convert::TryInto;
use core::fmt::{self, Display, Formatter};
use core::ptr;
use thiserror::Error;
#[allow(missing_docs)]
#[derive(Clone, Debug, PartialEq, PartialOrd)]
pub enum DataValue {
B(bool),
I8(i8),
I16(i16),
I32(i32),
I64(i64),
U8(u8),
U16(u16),
U32(u32),
U64(u64),
F32(Ieee32),
F64(Ieee64),
V128([u8; 16]),
}
impl DataValue {
pub fn from_integer(imm: i64, ty: Type) -> Result<DataValue, DataValueCastFailure> {
match ty {
types::I8 => Ok(DataValue::I8(imm as i8)),
types::I16 => Ok(DataValue::I16(imm as i16)),
types::I32 => Ok(DataValue::I32(imm as i32)),
types::I64 => Ok(DataValue::I64(imm)),
_ => Err(DataValueCastFailure::FromInteger(imm, ty)),
}
}
pub fn ty(&self) -> Type {
match self {
DataValue::B(_) => types::B8,
DataValue::I8(_) | DataValue::U8(_) => types::I8,
DataValue::I16(_) | DataValue::U16(_) => types::I16,
DataValue::I32(_) | DataValue::U32(_) => types::I32,
DataValue::I64(_) | DataValue::U64(_) => types::I64,
DataValue::F32(_) => types::F32,
DataValue::F64(_) => types::F64,
DataValue::V128(_) => types::I8X16,
}
}
pub fn is_vector(&self) -> bool {
match self {
DataValue::V128(_) => true,
_ => false,
}
}
pub unsafe fn write_value_to(&self, p: *mut u128) {
match self {
DataValue::B(b) => ptr::write(p as *mut bool, *b),
DataValue::I8(i) => ptr::write(p as *mut i8, *i),
DataValue::I16(i) => ptr::write(p as *mut i16, *i),
DataValue::I32(i) => ptr::write(p as *mut i32, *i),
DataValue::I64(i) => ptr::write(p as *mut i64, *i),
DataValue::F32(f) => ptr::write(p as *mut Ieee32, *f),
DataValue::F64(f) => ptr::write(p as *mut Ieee64, *f),
DataValue::V128(b) => ptr::write(p as *mut [u8; 16], *b),
_ => unimplemented!(),
}
}
pub unsafe fn read_value_from(p: *const u128, ty: Type) -> Self {
match ty {
types::I8 => DataValue::I8(ptr::read(p as *const i8)),
types::I16 => DataValue::I16(ptr::read(p as *const i16)),
types::I32 => DataValue::I32(ptr::read(p as *const i32)),
types::I64 => DataValue::I64(ptr::read(p as *const i64)),
types::F32 => DataValue::F32(ptr::read(p as *const Ieee32)),
types::F64 => DataValue::F64(ptr::read(p as *const Ieee64)),
_ if ty.is_bool() => DataValue::B(ptr::read(p as *const bool)),
_ if ty.is_vector() && ty.bytes() == 16 => {
DataValue::V128(ptr::read(p as *const [u8; 16]))
}
_ => unimplemented!(),
}
}
}
#[derive(Error, Debug, PartialEq)]
#[allow(missing_docs)]
pub enum DataValueCastFailure {
#[error("unable to cast data value of type {0} to type {1}")]
TryInto(Type, Type),
#[error("unable to cast i64({0}) to a data value of type {1}")]
FromInteger(i64, Type),
}
macro_rules! build_conversion_impl {
( $rust_ty:ty, $data_value_ty:ident, $cranelift_ty:ident ) => {
impl From<$rust_ty> for DataValue {
fn from(data: $rust_ty) -> Self {
DataValue::$data_value_ty(data)
}
}
impl TryInto<$rust_ty> for DataValue {
type Error = DataValueCastFailure;
fn try_into(self) -> Result<$rust_ty, Self::Error> {
if let DataValue::$data_value_ty(v) = self {
Ok(v)
} else {
Err(DataValueCastFailure::TryInto(
self.ty(),
types::$cranelift_ty,
))
}
}
}
};
}
build_conversion_impl!(bool, B, B8);
build_conversion_impl!(i8, I8, I8);
build_conversion_impl!(i16, I16, I16);
build_conversion_impl!(i32, I32, I32);
build_conversion_impl!(i64, I64, I64);
build_conversion_impl!(u8, U8, I8);
build_conversion_impl!(u16, U16, I16);
build_conversion_impl!(u32, U32, I32);
build_conversion_impl!(u64, U64, I64);
build_conversion_impl!(Ieee32, F32, F32);
build_conversion_impl!(Ieee64, F64, F64);
build_conversion_impl!([u8; 16], V128, I8X16);
impl From<Offset32> for DataValue {
fn from(o: Offset32) -> Self {
DataValue::from(Into::<i32>::into(o))
}
}
impl Display for DataValue {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
DataValue::B(dv) => write!(f, "{}", dv),
DataValue::I8(dv) => write!(f, "{}", dv),
DataValue::I16(dv) => write!(f, "{}", dv),
DataValue::I32(dv) => write!(f, "{}", dv),
DataValue::I64(dv) => write!(f, "{}", dv),
DataValue::U8(dv) => write!(f, "{}", dv),
DataValue::U16(dv) => write!(f, "{}", dv),
DataValue::U32(dv) => write!(f, "{}", dv),
DataValue::U64(dv) => write!(f, "{}", dv),
DataValue::F32(dv) => write!(f, "{}", dv),
DataValue::F64(dv) => write!(f, "{}", dv),
DataValue::V128(dv) => write!(f, "{}", ConstantData::from(&dv[..])),
}
}
}
pub struct DisplayDataValues<'a>(pub &'a [DataValue]);
impl<'a> Display for DisplayDataValues<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
if self.0.len() == 1 {
write!(f, "{}", self.0[0])
} else {
write!(f, "[")?;
write_data_value_list(f, &self.0)?;
write!(f, "]")
}
}
}
pub fn write_data_value_list(f: &mut Formatter<'_>, list: &[DataValue]) -> fmt::Result {
match list.len() {
0 => Ok(()),
1 => write!(f, "{}", list[0]),
_ => {
write!(f, "{}", list[0])?;
for dv in list.iter().skip(1) {
write!(f, ", {}", dv)?;
}
Ok(())
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn type_conversions() {
assert_eq!(DataValue::B(true).ty(), types::B8);
assert_eq!(
TryInto::<bool>::try_into(DataValue::B(false)).unwrap(),
false
);
assert_eq!(
TryInto::<i32>::try_into(DataValue::B(false)).unwrap_err(),
DataValueCastFailure::TryInto(types::B8, types::I32)
);
assert_eq!(DataValue::V128([0; 16]).ty(), types::I8X16);
assert_eq!(
TryInto::<[u8; 16]>::try_into(DataValue::V128([0; 16])).unwrap(),
[0; 16]
);
assert_eq!(
TryInto::<i32>::try_into(DataValue::V128([0; 16])).unwrap_err(),
DataValueCastFailure::TryInto(types::I8X16, types::I32)
);
}
}