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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! The local, garbage collected heap
use libc;
use libc::{c_void, uintptr_t, size_t};
use ops::Drop;
use option::{Option, None, Some};
use rt::local::Local;
use rt::task::Task;
use unstable::raw;
type MemoryRegion = c_void;
struct Env { priv opaque: () }
struct BoxedRegion {
env: *Env,
backing_region: *MemoryRegion,
live_allocs: *raw::Box<()>,
}
pub type OpaqueBox = c_void;
pub type TypeDesc = c_void;
pub struct LocalHeap {
memory_region: *MemoryRegion,
boxed_region: *BoxedRegion
}
impl LocalHeap {
#[fixed_stack_segment] #[inline(never)]
pub fn new() -> LocalHeap {
unsafe {
// XXX: These usually come from the environment
let detailed_leaks = false as uintptr_t;
let poison_on_free = false as uintptr_t;
let region = rust_new_memory_region(detailed_leaks, poison_on_free);
assert!(region.is_not_null());
let boxed = rust_new_boxed_region(region, poison_on_free);
assert!(boxed.is_not_null());
LocalHeap {
memory_region: region,
boxed_region: boxed
}
}
}
#[fixed_stack_segment] #[inline(never)]
pub fn alloc(&mut self, td: *TypeDesc, size: uint) -> *OpaqueBox {
unsafe {
return rust_boxed_region_malloc(self.boxed_region, td, size as size_t);
}
}
#[fixed_stack_segment] #[inline(never)]
pub fn realloc(&mut self, ptr: *OpaqueBox, size: uint) -> *OpaqueBox {
unsafe {
return rust_boxed_region_realloc(self.boxed_region, ptr, size as size_t);
}
}
#[fixed_stack_segment] #[inline(never)]
pub fn free(&mut self, box: *OpaqueBox) {
unsafe {
return rust_boxed_region_free(self.boxed_region, box);
}
}
}
impl Drop for LocalHeap {
#[fixed_stack_segment] #[inline(never)]
fn drop(&mut self) {
unsafe {
rust_delete_boxed_region(self.boxed_region);
rust_delete_memory_region(self.memory_region);
}
}
}
// A little compatibility function
pub unsafe fn local_free(ptr: *libc::c_char) {
// XXX: Unsafe borrow for speed. Lame.
let task_ptr: Option<*mut Task> = Local::try_unsafe_borrow();
match task_ptr {
Some(task) => {
(*task).heap.free(ptr as *libc::c_void);
}
None => rtabort!("local free outside of task")
}
}
pub fn live_allocs() -> *raw::Box<()> {
let region = do Local::borrow |task: &mut Task| {
task.heap.boxed_region
};
return unsafe { (*region).live_allocs };
}
extern {
#[fast_ffi]
fn rust_new_memory_region(detailed_leaks: uintptr_t,
poison_on_free: uintptr_t) -> *MemoryRegion;
#[fast_ffi]
fn rust_delete_memory_region(region: *MemoryRegion);
#[fast_ffi]
fn rust_new_boxed_region(region: *MemoryRegion,
poison_on_free: uintptr_t) -> *BoxedRegion;
#[fast_ffi]
fn rust_delete_boxed_region(region: *BoxedRegion);
#[fast_ffi]
fn rust_boxed_region_malloc(region: *BoxedRegion,
td: *TypeDesc,
size: size_t) -> *OpaqueBox;
#[fast_ffi]
fn rust_boxed_region_realloc(region: *BoxedRegion,
ptr: *OpaqueBox,
size: size_t) -> *OpaqueBox;
#[fast_ffi]
fn rust_boxed_region_free(region: *BoxedRegion, box: *OpaqueBox);
}
#[cfg(test)]
mod bench {
use extra::test::BenchHarness;
#[bench]
fn alloc_managed_small(bh: &mut BenchHarness) {
do bh.iter {
@10;
}
}
#[bench]
fn alloc_managed_big(bh: &mut BenchHarness) {
do bh.iter {
@[10, ..1000];
}
}
}
|
