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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-10-10 foxglove RT-Thread GlobalAlloc implementation
*/
use crate::api::mem::{mem_alloc, mem_alloc_aligned, mem_free, mem_free_aligned, mem_realloc};
use core::alloc::{GlobalAlloc, Layout};
use crate::panic::panic_on_atomic_context;
use core::ptr;
use core::ffi::c_void;
pub struct RttAlloc;
unsafe impl GlobalAlloc for RttAlloc {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
panic_on_atomic_context("alloc");
let size = layout.size();
let align = layout.align();
/* Handle zero-sized allocations */
if size == 0 {
return ptr::null_mut();
}
/* Use aligned allocation if alignment is greater than default
* RT-Thread's default alignment is typically 4 or 8 bytes */
if align > 8 {
match mem_alloc_aligned(size, align) {
Some(ptr) => ptr as *mut u8,
None => ptr::null_mut(),
}
} else {
match mem_alloc(size) {
Some(ptr) => ptr as *mut u8,
None => ptr::null_mut(),
}
}
}
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
panic_on_atomic_context("dealloc");
if ptr.is_null() {
return;
}
let align = layout.align();
/* Use aligned deallocation if the original allocation was aligned */
if align > 8 {
mem_free_aligned(ptr as *mut c_void);
} else {
mem_free(ptr as *mut c_void);
}
}
unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
panic_on_atomic_context("realloc");
/* Handle zero-sized new allocation */
if new_size == 0 {
self.dealloc(ptr, layout);
return ptr::null_mut();
}
/* Handle null pointer (equivalent to alloc) */
if ptr.is_null() {
let new_layout = Layout::from_size_align_unchecked(new_size, layout.align());
return self.alloc(new_layout);
}
/* For aligned allocations, we need to handle realloc manually
* since RT-Thread's rt_realloc may not preserve alignment */
let align = layout.align();
if align > 8 {
let new_ptr = match mem_alloc_aligned(new_size, align) {
Some(ptr) => ptr as *mut u8,
None => return ptr::null_mut(),
};
/* Copy data from old to new */
let copy_size = core::cmp::min(layout.size(), new_size);
ptr::copy_nonoverlapping(ptr, new_ptr, copy_size);
mem_free_aligned(ptr as *mut c_void);
new_ptr
} else {
match mem_realloc(ptr as *mut c_void, new_size) {
Some(new_ptr) => new_ptr as *mut u8,
None => ptr::null_mut(),
}
}
}
}
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