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Make sure arenas don't allocate bigger than HUGE_PAGE #78058

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Merged
merged 1 commit into from
Oct 18, 2020
Merged

Make sure arenas don't allocate bigger than HUGE_PAGE #78058

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12 changes: 4 additions & 8 deletions compiler/rustc_arena/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -223,10 +223,8 @@ impl<T> TypedArena<T> {
// If the previous chunk's len is less than HUGE_PAGE
// bytes, then this chunk will be least double the previous
// chunk's size.
new_cap = last_chunk.storage.len();
if new_cap < HUGE_PAGE / elem_size {
new_cap = new_cap.checked_mul(2).unwrap();
}
new_cap = last_chunk.storage.len().min(HUGE_PAGE / elem_size / 2);
new_cap = new_cap * 2;
} else {
new_cap = PAGE / elem_size;
}
Expand Down Expand Up @@ -343,10 +341,8 @@ impl DroplessArena {
// If the previous chunk's len is less than HUGE_PAGE
// bytes, then this chunk will be least double the previous
// chunk's size.
new_cap = last_chunk.storage.len();
if new_cap < HUGE_PAGE {
new_cap = new_cap.checked_mul(2).unwrap();
}
new_cap = last_chunk.storage.len().min(HUGE_PAGE / 2);
new_cap = new_cap * 2;
} else {
new_cap = PAGE;
}
Expand Down