bjoernager/rust
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Add tests to allocation methods and fix is_null()

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This commit is contained in:
Celina G. Val 2023-12-07 13:15:43 -08:00
parent 9cb6463af7
commit 0a0e7e6c0d
3 changed files with 114 additions and 7 deletions
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6
compiler/stable_mir/src/ty.rs
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@ -901,6 +901,7 @@ impl Allocation {
read_target_uint(&raw)
}
/// Read this allocation and try to convert it to an unassigned integer.
pub fn read_uint(&self) -> Result<u128, Error> {
if self.bytes.len() > 16 {
return Err(error!("Allocation is bigger than largest integer"));
@ -909,6 +910,7 @@ impl Allocation {
read_target_uint(&raw)
}
/// Read this allocation and try to convert it to a signed integer.
pub fn read_int(&self) -> Result<i128, Error> {
if self.bytes.len() > 16 {
return Err(error!("Allocation is bigger than largest integer"));
@ -917,6 +919,7 @@ impl Allocation {
read_target_int(&raw)
}
/// Read this allocation and try to convert it to a boolean.
pub fn read_bool(&self) -> Result<bool, Error> {
match self.read_int()? {
0 => Ok(false),
@ -925,13 +928,14 @@ impl Allocation {
}
}
/// Read this allocation as a pointer and return whether it represents a `null` pointer.
pub fn is_null(&self) -> Result<bool, Error> {
let len = self.bytes.len();
let ptr_len = MachineInfo::target_pointer_width().bytes();
if len != ptr_len {
return Err(error!("Expected width of pointer (`{ptr_len}`), but found: `{len}`"));
}
Ok(self.read_uint()? == 0)
Ok(self.read_uint()? == 0 && self.provenance.ptrs.is_empty())
}
}