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add Scalar::try_from_(u)int methods

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This commit is contained in:
Christian Poveda 2019-12-14 12:13:10 -05:00
parent c8ea4ace92
commit 0bce91ff0b
1 changed files with 22 additions and 12 deletions
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34
src/librustc/mir/interpret/value.rs
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@ -237,13 +237,18 @@ pub fn from_char(c: char) -> Self {
}
#[inline]
pub fn from_uint(i: impl Into<u128>, size: Size) -> Self {
pub fn try_from_uint(i: impl Into<u128>, size: Size) -> InterpResult<'tcx, Self> {
let i = i.into();
assert_eq!(
truncate(i, size), i,
"Unsigned value {:#x} does not fit in {} bits", i, size.bits()
);
Scalar::Raw { data: i, size: size.bytes() as u8 }
if truncate(i, size) == i {
Ok(Scalar::Raw { data: i, size: size.bytes() as u8 })
} else {
throw_unsup_format!("Unsigned value {:#x} does not fit in {} bits", i, size.bits())
}
}
#[inline]
pub fn from_uint(i: impl Into<u128>, size: Size) -> Self {
Self::try_from_uint(i, size).unwrap()
}
#[inline]
@ -267,15 +272,20 @@ pub fn from_u64(i: u64) -> Self {
}
#[inline]
pub fn from_int(i: impl Into<i128>, size: Size) -> Self {
pub fn try_from_int(i: impl Into<i128>, size: Size) -> InterpResult<'tcx, Self> {
let i = i.into();
// `into` performed sign extension, we have to truncate
let truncated = truncate(i as u128, size);
assert_eq!(
sign_extend(truncated, size) as i128, i,
"Signed value {:#x} does not fit in {} bits", i, size.bits()
);
Scalar::Raw { data: truncated, size: size.bytes() as u8 }
if sign_extend(truncated, size) as i128 == i {
Ok(Scalar::Raw { data: truncated, size: size.bytes() as u8 })
} else {
throw_unsup_format!("Signed value {:#x} does not fit in {} bits", i, size.bits())
}
}
#[inline]
pub fn from_int(i: impl Into<i128>, size: Size) -> Self {
Self::try_from_int(i, size).unwrap()
}
#[inline]