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Add safety notice for TrampolineBufferBuilder::remove_global.

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This commit is contained in:
losfair 2020-02-26 17:07:56 +08:00
parent 262d431b49
commit b0877b26e5
1 changed files with 10 additions and 2 deletions
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12
lib/runtime-core/src/trampoline_x64.rs
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@ -66,6 +66,8 @@ impl TrampBuffer {
}
/// Removes a previously-`insert`ed trampoline.
///
/// For safety, refer to the public interface `TrampolineBufferBuilder::remove_global`.
unsafe fn remove(&self, start: NonNull<u8>) {
let start = start.as_ptr() as usize - self.buffer.get_backing_ptr() as usize;
let mut alloc = self.alloc.lock().unwrap();
@ -311,12 +313,18 @@ impl TrampolineBufferBuilder {
idx
}
/// Inserts to the global trampoline buffer.
/// Inserts this trampoline to the global trampoline buffer.
pub fn insert_global(self) -> Option<NonNull<u8>> {
TRAMPOLINES.insert(&self.code)
}
/// Removes from the global trampoline buffer.
/// Removes the trampoline pointed to by `ptr` from the global trampoline buffer. Panics if `ptr`
/// does not point to any trampoline.
///
/// # Safety
///
/// Calling this function invalidates the trampoline `ptr` points to and recycles its memory. You
/// should ensure that `ptr` isn't used after calling `remove_global`.
pub unsafe fn remove_global(ptr: NonNull<u8>) {
TRAMPOLINES.remove(ptr);
}