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Protect::ReadWriteExec is readable and writable.

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Also assert that page size is a power of two in two places we assume it is.
This commit is contained in:
Nick Lewycky
2019-08-07 16:27:31 -07:00
parent bd31422872
commit 75959577c3
1 changed files with 4 additions and 2 deletions
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6
lib/runtime-core/src/sys/unix/memory.rs
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@ -261,14 +261,14 @@ impl Protect {
pub fn is_readable(self) -> bool {
match self {
Protect::Read | Protect::ReadWrite | Protect::ReadExec => true,
Protect::Read | Protect::ReadWrite | Protect::ReadExec | Protect::ReadWriteExec => true,
_ => false,
}
}
pub fn is_writable(self) -> bool {
match self {
Protect::ReadWrite => true,
Protect::ReadWrite | Protect::ReadWriteExec => true,
_ => false,
}
}
@ -297,10 +297,12 @@ impl Drop for RawFd {
/// Round `size` up to the nearest multiple of `page_size`.
fn round_up_to_page_size(size: usize, page_size: usize) -> usize {
assert!(page_size.is_power_of_two());
(size + (page_size - 1)) & !(page_size - 1)
}
/// Round `size` down to the nearest multiple of `page_size`.
fn round_down_to_page_size(size: usize, page_size: usize) -> usize {
assert!(page_size.is_power_of_two());
size & !(page_size - 1)
}