### MiMalloc Global Allocator

Source: https://docs.rs/mimalloc/latest/mimalloc/struct.MiMalloc

This section details the `MiMalloc` struct and its implementation as a global allocator in Rust, along with usage examples.

```APIDOC
## Struct MiMalloc

### Description
Drop-in mimalloc global allocator.

### Usage
```rust
use mimalloc::MiMalloc;

#[global_allocator]
static GLOBAL: MiMalloc = MiMalloc;
```

## Trait Implementations

### impl GlobalAlloc for MiMalloc

#### `unsafe fn alloc(&self, layout: Layout) -> *mut u8`
Allocates memory as described by the given `layout`.

#### `unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8`
Behaves like `alloc`, but also ensures that the contents are set to zero before being returned.

#### `unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout)`
Deallocates the block of memory at the given `ptr` pointer with the given `layout`.

#### `unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8`
Shrinks or grows a block of memory to the given `new_size` in bytes. The block is described by the given `ptr` pointer and `layout`.
```

--------------------------------

### Enable Secure Mode for mimalloc in Rust

Source: https://docs.rs/mimalloc/latest/index

This example shows how to enable the secure mode for the mimalloc allocator in a Rust project by specifying the 'secure' feature flag in the `Cargo.toml` file. Secure mode enhances memory safety with features like guard pages and randomization, potentially with a slight performance cost.

```toml
[dependencies]
mimalloc = { version = "*", features = ["secure"] }
```

--------------------------------

### Rust mimalloc Allocation and Deallocation Tests

Source: https://docs.rs/mimalloc/latest/src/mimalloc/lib.rs

Contains unit tests for the `MiMalloc` global allocator in Rust. These tests verify the functionality of allocating, zero-allocating, and reallocating memory blocks of various sizes, ensuring that memory can be safely deallocated afterwards.

```rust
use super::*;
use core::alloc::Layout;

#[test]
fn it_frees_allocated_memory() {
    unsafe {
        let layout = Layout::from_size_align(8, 8).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc(layout);
        alloc.dealloc(ptr, layout);
    }
}

#[test]
fn it_frees_allocated_big_memory() {
    unsafe {
        let layout = Layout::from_size_align(1 << 20, 32).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc(layout);
        alloc.dealloc(ptr, layout);
    }
}

#[test]
fn it_frees_zero_allocated_memory() {
    unsafe {
        let layout = Layout::from_size_align(8, 8).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc_zeroed(layout);
        alloc.dealloc(ptr, layout);
    }
}

#[test]
fn it_frees_zero_allocated_big_memory() {
    unsafe {
        let layout = Layout::from_size_align(1 << 20, 32).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc_zeroed(layout);
        alloc.dealloc(ptr, layout);
    }
}

#[test]
fn it_frees_reallocated_memory() {
    unsafe {
        let layout = Layout::from_size_align(8, 8).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc(layout);
        let ptr = alloc.realloc(ptr, layout, 16);
        alloc.dealloc(ptr, layout);
    }
}

#[test]
fn it_frees_reallocated_big_memory() {
    unsafe {
        let layout = Layout::from_size_align(1 << 20, 32).unwrap();
        let alloc = MiMalloc;

        let ptr = alloc.alloc(layout);
        let ptr = alloc.realloc(ptr, layout, 2 << 20);
        alloc.dealloc(ptr, layout);
    }
}
```

--------------------------------

### MiMalloc GlobalAlloc Alloc Method

Source: https://docs.rs/mimalloc/latest/mimalloc/struct.MiMalloc

Demonstrates the 'alloc' method for the MiMalloc global allocator. This function is responsible for allocating memory according to the specified layout.

```rust
unsafe fn alloc(&self, layout: Layout) -> *mut u8
```

--------------------------------

### MiMalloc GlobalAlloc Alloc Zeroed Method

Source: https://docs.rs/mimalloc/latest/mimalloc/struct.MiMalloc

Illustrates the 'alloc_zeroed' method for the MiMalloc global allocator. This method allocates memory and ensures its contents are initialized to zero.

```rust
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8
```

--------------------------------

### MiMalloc GlobalAlloc Realloc Method

Source: https://docs.rs/mimalloc/latest/mimalloc/struct.MiMalloc

Details the 'realloc' method for the MiMalloc global allocator. This method resizes a memory block to a new size.

```rust
unsafe fn realloc(
  &self,
  ptr: *mut u8,
  layout: Layout,
  new_size: usize,
) -> *mut u8
```

--------------------------------

### Rust mimalloc Global Allocator Implementation

Source: https://docs.rs/mimalloc/latest/src/mimalloc/lib.rs

Provides the core implementation of the `MiMalloc` struct in Rust, which adheres to the `GlobalAlloc` trait. It includes unsafe implementations for `alloc`, `alloc_zeroed`, `dealloc`, and `realloc` using the underlying `mimalloc` C functions.

```rust
use core::alloc::{GlobalAlloc, Layout};
use core::ffi::c_void;
use libmimalloc_sys::*;

pub struct MiMalloc;

unsafe impl GlobalAlloc for MiMalloc {
    #[inline]
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        mi_malloc_aligned(layout.size(), layout.align()) as *mut u8
    }

    #[inline]
    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
        mi_zalloc_aligned(layout.size(), layout.align()) as *mut u8
    }

    #[inline]
    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
        mi_free(ptr as *mut c_void);
    }

    #[inline]
    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
        mi_realloc_aligned(ptr as *mut c_void, new_size, layout.align()) as *mut u8
    }
}
```

--------------------------------

### MiMalloc GlobalAlloc Dealloc Method

Source: https://docs.rs/mimalloc/latest/mimalloc/struct.MiMalloc

Shows the 'dealloc' method for the MiMalloc global allocator. This function deallocates a previously allocated block of memory.

```rust
unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout)
```

--------------------------------

### Set mimalloc as Global Allocator in Rust

Source: https://docs.rs/mimalloc/latest/index

This code snippet demonstrates how to integrate the mimalloc crate as the global allocator in a Rust project by adding the `#[global_allocator]` attribute. It requires the `mimalloc` crate to be added as a dependency.

```rust
use mimalloc::MiMalloc;

#[global_allocator]
static GLOBAL: MiMalloc = MiMalloc;
```

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