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use checked_sub for peekn_extra

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This commit is contained in:
Patrick Ventuzelo
2019-11-26 09:17:13 +01:00
parent cd0da74b33
commit 49665d5797
1 changed files with 4 additions and 7 deletions
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11
lib/llvm-backend/src/state.rs
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@ -240,14 +240,11 @@ impl State {
&self,
n: usize,
) -> Result<&[(BasicValueEnum, ExtraInfo)], BinaryReaderError> {
if self.stack.len() < n {
return Err(BinaryReaderError {
message: "invalid value stack",
offset: -1isize as usize,
});
}
let new_len = self.stack.len().checked_sub(n).ok_or(BinaryReaderError {
message: "invalid value stack",
offset: -1isize as usize,
})?;
let new_len = self.stack.len() - n;
Ok(&self.stack[new_len..])
}