allocator-suite 0.1.7

Allocator Suite for various allocation types
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

use crate::memory_address::MemoryAddress;
use std::alloc::{AllocErr, AllocRef, GlobalAlloc, Layout};
use std::ops::Deref;
use core::ptr::NonNull;
use crate::allocators::allocator::Allocator;

use std::num::NonZeroUsize;

/// Adapts an `Allocator` to the `GlobalAlloc` and `Alloc` traits.
#[repr(transparent)]
#[derive(Debug)]
pub struct AllocatorAdaptor<'a, A: 'a + Allocator>(pub(crate) &'a A);

impl<'a, A: 'a + Allocator> Deref for AllocatorAdaptor<'a, A> {
    type Target = A;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        self.0
    }
}

unsafe impl<'a, A: 'a + Allocator> GlobalAlloc for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        self.global_alloc_alloc(layout)
    }

    #[inline(always)]
    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
        self.global_alloc_alloc_zeroed(layout)
    }

    #[inline(always)]
    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        self.global_alloc_dealloc(ptr, layout)
    }

    #[inline(always)]
    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
        self.global_alloc_realloc(ptr, layout, new_size)
    }
}

unsafe impl<'a, A: 'a + Allocator> AllocRef for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    fn alloc(&mut self, layout: Layout) -> Result<NonNull<[u8]>, AllocErr> {
        let size = layout.size();
        let ptr = unsafe { self.alloc_alloc_zeroed(layout) }?;
        Ok(NonNull::slice_from_raw_parts(ptr, size))
    }

    #[inline(always)]
    unsafe fn dealloc(&mut self, ptr: MemoryAddress, layout: Layout) {
        self.alloc_dealloc(ptr, layout)
    }
}

impl<'a, A: 'a + Allocator> Allocator for AllocatorAdaptor<'a, A> {
    #[inline(always)]
    fn allocate(
        &self,
        non_zero_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0
            .allocate(non_zero_size, non_zero_power_of_two_alignment)
    }

    #[inline(always)]
    fn deallocate(
        &self,
        non_zero_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        current_memory: MemoryAddress,
    ) {
        self.0.deallocate(
            non_zero_size,
            non_zero_power_of_two_alignment,
            current_memory,
        )
    }

    #[inline(always)]
    fn growing_reallocate(
        &self,
        non_zero_new_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        non_zero_current_size: NonZeroUsize,
        current_memory: MemoryAddress,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0.growing_reallocate(
            non_zero_new_size,
            non_zero_power_of_two_alignment,
            non_zero_current_size,
            current_memory,
        )
    }

    #[inline(always)]
    fn shrinking_reallocate(
        &self,
        non_zero_new_size: NonZeroUsize,
        non_zero_power_of_two_alignment: NonZeroUsize,
        non_zero_current_size: NonZeroUsize,
        current_memory: MemoryAddress,
    ) -> Result<MemoryAddress, AllocErr> {
        self.0.shrinking_reallocate(
            non_zero_new_size,
            non_zero_power_of_two_alignment,
            non_zero_current_size,
            current_memory,
        )
    }
}