1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
#![allocator]
#![feature(allocator)]
#![feature(const_fn)]
#![no_std]
extern crate cortex_m;
extern crate linked_list_allocator;
use core::{ptr, cmp};
use cortex_m::interrupt::Mutex;
pub static HEAP: Mutex<Heap> = Mutex::new(Heap::empty());
pub struct Heap {
inner: linked_list_allocator::Heap,
}
impl Heap {
const fn empty() -> Self {
Heap { inner: linked_list_allocator::Heap::empty() }
}
pub unsafe fn init(&mut self, heap_bottom: usize, heap_size: usize) {
self.inner.init(heap_bottom, heap_size);
}
}
#[doc(hidden)]
#[no_mangle]
pub extern "C" fn __rust_allocate(size: usize, align: usize) -> *mut u8 {
HEAP.lock(|heap| {
heap.inner.allocate_first_fit(size, align).expect("out of memory")
})
}
#[doc(hidden)]
#[no_mangle]
pub extern "C" fn __rust_deallocate(ptr: *mut u8, size: usize, align: usize) {
HEAP.lock(|heap| unsafe { heap.inner.deallocate(ptr, size, align) });
}
#[doc(hidden)]
#[no_mangle]
pub extern "C" fn __rust_reallocate(ptr: *mut u8,
size: usize,
new_size: usize,
align: usize)
-> *mut u8 {
let new_ptr = __rust_allocate(new_size, align);
unsafe { ptr::copy(ptr, new_ptr, cmp::min(size, new_size)) };
__rust_deallocate(ptr, size, align);
new_ptr
}
#[doc(hidden)]
#[no_mangle]
pub extern "C" fn __rust_reallocate_inplace(_ptr: *mut u8,
size: usize,
_new_size: usize,
_align: usize)
-> usize {
size
}
#[doc(hidden)]
#[no_mangle]
pub extern "C" fn __rust_usable_size(size: usize, _align: usize) -> usize {
size
}