bjoernager/rust
bjoernager/rust
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restrict the valid range of references if -Z reference-niches is set

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Note that this doesn't actually work at all, as many places in rustc
assume that references only have the null niche.
This commit is contained in:
Moulins 2023-06-24 01:34:14 +02:00
parent 8b847ef734
commit 3c05276866
2 changed files with 64 additions and 11 deletions
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31
compiler/rustc_abi/src/lib.rs
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@ -354,6 +354,31 @@ impl TargetDataLayout {
}
}
/// Returns the theoretical maximum address.
///
/// Note that this doesn't take into account target-specific limitations.
#[inline]
pub fn max_address(&self) -> u64 {
match self.pointer_size.bits() {
16 => u16::MAX.into(),
32 => u32::MAX.into(),
64 => u64::MAX,
bits => panic!("max_address: unknown pointer bit size {}", bits),
}
}
/// Returns the (inclusive) range of possible addresses for an allocation with
/// the given size and alignment.
///
/// Note that this doesn't take into account target-specific limitations.
#[inline]
pub fn address_range_for(&self, size: Size, align: Align) -> (u64, u64) {
let end = Size::from_bytes(self.max_address());
let min = align.bytes();
let max = (end - size).align_down_to(align).bytes();
(min, max)
}
#[inline]
pub fn vector_align(&self, vec_size: Size) -> AbiAndPrefAlign {
for &(size, align) in &self.vector_align {
@ -481,6 +506,12 @@ impl Size {
Size::from_bytes((self.bytes() + mask) & !mask)
}
#[inline]
pub fn align_down_to(self, align: Align) -> Size {
let mask = align.bytes() - 1;
Size::from_bytes(self.bytes() & !mask)
}
#[inline]
pub fn is_aligned(self, align: Align) -> bool {
let mask = align.bytes() - 1;