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Reduce grow_and_alloc_raw to a single call site.

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The current structure is clumsy, calling `alloc_raw_without_grow` in one
function, and then if that fails, calling another function that calls
`alloc_raw_without_grow` again.
This commit is contained in:
Nicholas Nethercote 2023-09-20 07:54:27 +10:00
parent 25407bc0bb
commit 55a1a5223a
1 changed files with 12 additions and 12 deletions
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24
compiler/rustc_arena/src/lib.rs
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@ -412,6 +412,8 @@ impl Default for DroplessArena {
}
impl DroplessArena {
#[inline(never)]
#[cold]
fn grow(&self, layout: Layout) {
// Add some padding so we can align `self.end` while
// still fitting in a `layout` allocation.
@ -451,13 +453,6 @@ impl DroplessArena {
}
}
#[inline(never)]
#[cold]
fn grow_and_alloc_raw(&self, layout: Layout) -> *mut u8 {
self.grow(layout);
self.alloc_raw_without_grow(layout).unwrap()
}
/// Allocates a byte slice with specified layout from the current memory
/// chunk. Returns `None` if there is no free space left to satisfy the
/// request.
@ -488,12 +483,17 @@ impl DroplessArena {
#[inline]
pub fn alloc_raw(&self, layout: Layout) -> *mut u8 {
assert!(layout.size() != 0);
if let Some(a) = self.alloc_raw_without_grow(layout) {
return a;
// This loop executes once or twice: if allocation fails the first
// time, the `grow` ensures it will succeed the second time.
loop {
if let Some(a) = self.alloc_raw_without_grow(layout) {
return a;
}
// No free space left. Allocate a new chunk to satisfy the request.
// On failure the grow will panic or abort.
self.grow(layout);
}
// No free space left. Allocate a new chunk to satisfy the request.
// On failure the grow will panic or abort.
self.grow_and_alloc_raw(layout)
}
#[inline]