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Remove a level of indirection from std::arena.

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This commit is contained in:
Michael Sullivan 2012-08-21 16:37:50 -07:00
parent f24e0e7b13
commit 73a03824e8
1 changed files with 20 additions and 20 deletions
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40
src/libstd/arena.rs
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@ -46,15 +46,15 @@ const tydesc_drop_glue_index: size_t = 3 as size_t;
// The way arena uses arrays is really deeply awful. The arrays are
// allocated, and have capacities reserved, but the fill for the array
// will always stay at 0.
type chunk = {data: ~[u8], mut fill: uint, is_pod: bool};
type chunk = {data: @[u8], mut fill: uint, is_pod: bool};
struct arena {
// The head is seperated out from the list as a unbenchmarked
// microoptimization, to avoid needing to case on the list to
// access the head.
priv mut head: @chunk;
priv mut pod_head: @chunk;
priv mut chunks: @list<@chunk>;
priv mut head: chunk;
priv mut pod_head: chunk;
priv mut chunks: @list<chunk>;
drop {
unsafe {
destroy_chunk(self.head);
@ -65,10 +65,10 @@ struct arena {
}
}
fn chunk(size: uint, is_pod: bool) -> @chunk {
let mut v = ~[];
vec::reserve(v, size);
@{ data: v, mut fill: 0u, is_pod: is_pod }
fn chunk(size: uint, is_pod: bool) -> chunk {
let mut v = @[];
unsafe { at_vec::unsafe::reserve(v, size); }
{ data: v, mut fill: 0u, is_pod: is_pod }
}
fn arena_with_size(initial_size: uint) -> arena {
@ -88,9 +88,9 @@ fn round_up_to(base: uint, align: uint) -> uint {
// Walk down a chunk, running the destructors for any objects stored
// in it.
unsafe fn destroy_chunk(chunk: @chunk) {
unsafe fn destroy_chunk(chunk: chunk) {
let mut idx = 0;
let buf = vec::unsafe::to_ptr(chunk.data);
let buf = vec::unsafe::to_ptr_slice(chunk.data);
let fill = chunk.fill;
while idx < fill {
@ -133,9 +133,9 @@ impl &arena {
// Functions for the POD part of the arena
fn alloc_pod_grow(n_bytes: uint, align: uint) -> *u8 {
// Allocate a new chunk.
let chunk_size = vec::capacity(self.pod_head.data);
let chunk_size = at_vec::capacity(self.pod_head.data);
let new_min_chunk_size = uint::max(n_bytes, chunk_size);
self.chunks = @cons(self.pod_head, self.chunks);
self.chunks = @cons(copy self.pod_head, self.chunks);
self.pod_head =
chunk(uint::next_power_of_two(new_min_chunk_size + 1u), true);
@ -144,11 +144,11 @@ impl &arena {
#[inline(always)]
fn alloc_pod_inner(n_bytes: uint, align: uint) -> *u8 {
let head = self.pod_head;
let head = &mut self.pod_head;
let start = round_up_to(head.fill, align);
let end = start + n_bytes;
if end > vec::capacity(head.data) {
if end > at_vec::capacity(head.data) {
return self.alloc_pod_grow(n_bytes, align);
}
head.fill = end;
@ -157,7 +157,7 @@ impl &arena {
// start, n_bytes, align, head.fill);
unsafe {
ptr::offset(vec::unsafe::to_ptr(head.data), start)
ptr::offset(vec::unsafe::to_ptr_slice(head.data), start)
}
}
@ -175,9 +175,9 @@ impl &arena {
// Functions for the non-POD part of the arena
fn alloc_nonpod_grow(n_bytes: uint, align: uint) -> (*u8, *u8) {
// Allocate a new chunk.
let chunk_size = vec::capacity(self.head.data);
let chunk_size = at_vec::capacity(self.head.data);
let new_min_chunk_size = uint::max(n_bytes, chunk_size);
self.chunks = @cons(self.head, self.chunks);
self.chunks = @cons(copy self.head, self.chunks);
self.head =
chunk(uint::next_power_of_two(new_min_chunk_size + 1u), false);
@ -186,13 +186,13 @@ impl &arena {
#[inline(always)]
fn alloc_nonpod_inner(n_bytes: uint, align: uint) -> (*u8, *u8) {
let head = self.head;
let head = &mut self.head;
let tydesc_start = head.fill;
let after_tydesc = head.fill + sys::size_of::<*TypeDesc>();
let start = round_up_to(after_tydesc, align);
let end = start + n_bytes;
if end > vec::capacity(head.data) {
if end > at_vec::capacity(head.data) {
return self.alloc_nonpod_grow(n_bytes, align);
}
head.fill = round_up_to(end, sys::pref_align_of::<*TypeDesc>());
@ -201,7 +201,7 @@ impl &arena {
// start, n_bytes, align, head.fill);
unsafe {
let buf = vec::unsafe::to_ptr(head.data);
let buf = vec::unsafe::to_ptr_slice(head.data);
return (ptr::offset(buf, tydesc_start), ptr::offset(buf, start));
}
}