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Add basic allocator

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This commit is contained in:
pjht 2024-06-02 11:00:04 -05:00
parent 128078e9f9
commit 0896806123
Signed by: pjht
GPG Key ID: 7B5F6AFBEC7EE78E
1 changed files with 17 additions and 14 deletions
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27
library/std/src/sys/pal/mikros/alloc.rs
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@ -1,23 +1,26 @@
use crate::alloc::{GlobalAlloc, Layout, System}; use crate::{
use crate::ptr::null_mut; alloc::{GlobalAlloc, Layout, System},
ptr::null_mut,
};
static mut HEAP: [u8; 16384] = [0u8; 16384];
static mut HEAP_USED: usize = 0;
#[stable(feature = "alloc_system_type", since = "1.28.0")] #[stable(feature = "alloc_system_type", since = "1.28.0")]
unsafe impl GlobalAlloc for System { unsafe impl GlobalAlloc for System {
#[inline] #[inline]
unsafe fn alloc(&self, _layout: Layout) -> *mut u8 { unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
unsafe {
if 16384 - HEAP_USED < layout.size() {
null_mut() null_mut()
} else {
let ptr = &mut HEAP[HEAP_USED] as *mut u8;
HEAP_USED += layout.size();
ptr
}
} }
#[inline]
unsafe fn alloc_zeroed(&self, _layout: Layout) -> *mut u8 {
null_mut()
} }
#[inline] #[inline]
unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout) {} unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout) {}
#[inline]
unsafe fn realloc(&self, _ptr: *mut u8, _layout: Layout, _new_size: usize) -> *mut u8 {
null_mut()
}
} }