mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-09 05:36:17 +00:00
11c624e488
This commit:
* renames `coresimd` to `core_arch` and `stdsimd` to `std_detect`
* `std_detect` does no longer depend on `core_arch` - it is a freestanding
`no_std` library that only depends on `core` - it is renamed to `std_detect`
* moves the top-level coresimd and stdsimd directories into the appropriate
crates/... directories - this simplifies creating crate.io releases of these crates
* moves the top-level `coresimd` and `stdsimd` sub-directories into their
corresponding crates in `crates/{core_arch, std_detect}`.
48 lines
944 B
Rust
48 lines
944 B
Rust
//! A simple slab allocator for pages in wasm
|
|
|
|
#![feature(stdsimd)]
|
|
#![cfg(target_arch = "wasm32")]
|
|
|
|
extern crate core_arch;
|
|
|
|
use std::ptr;
|
|
|
|
use core_arch::arch::wasm32::*;
|
|
|
|
static mut HEAD: *mut *mut u8 = 0 as _;
|
|
|
|
#[no_mangle]
|
|
pub unsafe extern "C" fn page_alloc() -> *mut u8 {
|
|
if !HEAD.is_null() {
|
|
let next = *HEAD;
|
|
let ret = HEAD;
|
|
HEAD = next as *mut _;
|
|
return ret as *mut u8;
|
|
}
|
|
|
|
let ret = memory_grow(0, 1);
|
|
|
|
// if we failed to allocate a page then return null
|
|
if ret == usize::max_value() {
|
|
return ptr::null_mut();
|
|
}
|
|
|
|
((ret as u32) * page_size()) as *mut u8
|
|
}
|
|
|
|
#[no_mangle]
|
|
pub unsafe extern "C" fn page_free(page: *mut u8) {
|
|
let page = page as *mut *mut u8;
|
|
*page = HEAD as *mut u8;
|
|
HEAD = page;
|
|
}
|
|
|
|
#[no_mangle]
|
|
pub unsafe extern "C" fn memory_used() -> usize {
|
|
(page_size() * (memory_size(0) as u32)) as usize
|
|
}
|
|
|
|
fn page_size() -> u32 {
|
|
64 * 1024
|
|
}
|