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Fix a panic in Stylo memory reporting.

Browse source 
`MallocSizeOfOps::enclosing_size_of_op` is an `Option<>` type, and the panic in
question is caused by not providing a value in a case where it's needed for
measuring a HashSet.

HashMaps and HashSets are common enough that it makes sense to make
`enclosing_size_of_op` non-optional, which this patch does.
This commit is contained in:
Nicholas Nethercote 2017-09-18 13:37:53 +10:00
parent 280ccf685d
commit 09143e627b
3 changed files with 20 additions and 11 deletions
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11
components/malloc_size_of/lib.rs
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@ -82,9 +82,8 @@ pub struct MallocSizeOfOps {
/// A function that returns the size of a heap allocation.
size_of_op: VoidPtrToSizeFn,
/// Like `size_of_op`, but can take an interior pointer. Optional, because
/// many places don't need it.
enclosing_size_of_op: Option<VoidPtrToSizeFn>,
/// Like `size_of_op`, but can take an interior pointer.
enclosing_size_of_op: VoidPtrToSizeFn,
/// Check if a pointer has been seen before, and remember it for next time.
/// Useful when measuring `Rc`s and `Arc`s. Optional, because many places
@ -93,8 +92,7 @@ pub struct MallocSizeOfOps {
}
impl MallocSizeOfOps {
pub fn new(size_of: VoidPtrToSizeFn,
malloc_enclosing_size_of: Option<VoidPtrToSizeFn>,
pub fn new(size_of: VoidPtrToSizeFn, malloc_enclosing_size_of: VoidPtrToSizeFn,
have_seen_ptr: Option<Box<VoidPtrToBoolFnMut>>) -> Self {
MallocSizeOfOps {
size_of_op: size_of,
@ -129,8 +127,7 @@ impl MallocSizeOfOps {
/// Call `enclosing_size_of_op` on `ptr`, which must not be empty.
pub unsafe fn malloc_enclosing_size_of<T>(&self, ptr: *const T) -> usize {
assert!(!MallocSizeOfOps::is_empty(ptr));
let enclosing_size_of_op = self.enclosing_size_of_op.expect("missing enclosing_size_of_op");
enclosing_size_of_op(ptr as *const c_void)
(self.enclosing_size_of_op)(ptr as *const c_void)
}
/// Call `have_seen_ptr_op` on `ptr`.