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remove zeroing out from Stack::truncate

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This commit is contained in:
Mark Thom
2019-12-08 11:43:22 -07:00
parent 2be7070e1a
commit 923c9d4ad8
1 changed files with 0 additions and 6 deletions
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6
src/prolog/machine/stack.rs
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@@ -17,10 +17,6 @@ const fn prelude_size<Prelude>() -> usize {
(size & !(align - 1)) + align (size & !(align - 1)) + align
} }
/* The Stack is dropped manually at the discretion of the WAM, despite
having no Drop implementation. That's because it needs to know whether
the top frame is an AND frame or an OR frame. The WAM can
tell it. */
pub struct Stack { pub struct Stack {
size: usize, size: usize,
base: *const u8, base: *const u8,
@@ -350,7 +346,6 @@ impl Stack {
let size_of_frame = AndFrame::size_of(frame.prelude.univ_prelude.num_cells); let size_of_frame = AndFrame::size_of(frame.prelude.univ_prelude.num_cells);
ptr::drop_in_place(frame_ptr); ptr::drop_in_place(frame_ptr);
ptr::write(frame_ptr, mem::zeroed::<AndFrame>());
b + size_of_frame b + size_of_frame
} else { } else {
@@ -361,7 +356,6 @@ impl Stack {
let size_of_frame = OrFrame::size_of(frame.prelude.univ_prelude.num_cells); let size_of_frame = OrFrame::size_of(frame.prelude.univ_prelude.num_cells);
ptr::drop_in_place(frame_ptr); ptr::drop_in_place(frame_ptr);
ptr::write(frame_ptr, mem::zeroed::<OrFrame>());
b + size_of_frame b + size_of_frame
}; };