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Add ImmTy::try_from_(u)int methods #67299

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Merged
merged 4 commits into from
Dec 22, 2019
Merged

Add ImmTy::try_from_(u)int methods #67299

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0bce91f
add Scalar::try_from_(u)int methods
pvdrz Dec 14, 2019
90686de
add ImmTy::try_from_(u)int methods
pvdrz Dec 14, 2019
309f437
Change results to options
pvdrz Dec 21, 2019
683c4c7
Add error message if `Scalar::from_(u)int` fails
pvdrz Dec 22, 2019
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38 changes: 27 additions & 11 deletions src/librustc/mir/interpret/value.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -236,14 +236,22 @@ impl<'tcx, Tag> Scalar<Tag> {
Scalar::Raw { data: c as u128, size: 4 }
}

#[inline]
pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self> {
let i = i.into();
if truncate(i, size) == i {
Some(Scalar::Raw { data: i, size: size.bytes() as u8 })
} else {
None
}
}

#[inline]
pub fn from_uint(i: impl Into<u128>, size: Size) -> 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 }
Self::try_from_uint(i, size).unwrap_or_else(|| {
bug!("Unsigned value {:#x} does not fit in {} bits", i, size.bits())
})
}

#[inline]
Expand All @@ -267,15 +275,23 @@ impl<'tcx, Tag> Scalar<Tag> {
}

#[inline]
pub fn from_int(i: impl Into<i128>, size: Size) -> Self {
pub fn try_from_int(i: impl Into<i128>, size: Size) -> Option<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 {
Some(Scalar::Raw { data: truncated, size: size.bytes() as u8 })
} else {
None
}
}

#[inline]
pub fn from_int(i: impl Into<i128>, size: Size) -> Self {
let i = i.into();
Self::try_from_int(i, size).unwrap_or_else(|| {
bug!("Signed value {:#x} does not fit in {} bits", i, size.bits())
})
}

#[inline]
Expand Down
9 changes: 9 additions & 0 deletions src/librustc_mir/interpret/operand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -218,11 +218,20 @@ impl<'tcx, Tag: Copy> ImmTy<'tcx, Tag> {
ImmTy { imm: val.into(), layout }
}

#[inline]
pub fn try_from_uint(i: impl Into<u128>, layout: TyLayout<'tcx>) -> Option<Self> {
Some(Self::from_scalar(Scalar::try_from_uint(i, layout.size)?, layout))
}
#[inline]
pub fn from_uint(i: impl Into<u128>, layout: TyLayout<'tcx>) -> Self {
Self::from_scalar(Scalar::from_uint(i, layout.size), layout)
}

#[inline]
pub fn try_from_int(i: impl Into<i128>, layout: TyLayout<'tcx>) -> Option<Self> {
Some(Self::from_scalar(Scalar::try_from_int(i, layout.size)?, layout))
}

#[inline]
pub fn from_int(i: impl Into<i128>, layout: TyLayout<'tcx>) -> Self {
Self::from_scalar(Scalar::from_int(i, layout.size), layout)
Expand Down