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// Copyright 2024, Linaro Limited
// Author(s): Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
// SPDX-License-Identifier: GPL-2.0-or-later
#![cfg_attr(not(MESON), doc = include_str!("../README.md"))]
#[allow(
dead_code,
improper_ctypes_definitions,
improper_ctypes,
non_camel_case_types,
non_snake_case,
non_upper_case_globals,
unsafe_op_in_unsafe_fn,
clippy::missing_const_for_fn,
clippy::too_many_arguments,
clippy::approx_constant,
clippy::use_self,
clippy::useless_transmute,
clippy::missing_safety_doc,
)]
#[rustfmt::skip]
pub mod bindings;
unsafe impl Send for bindings::Property {}
unsafe impl Sync for bindings::Property {}
unsafe impl Sync for bindings::TypeInfo {}
unsafe impl Sync for bindings::VMStateDescription {}
unsafe impl Sync for bindings::VMStateField {}
unsafe impl Sync for bindings::VMStateInfo {}
pub mod c_str;
pub mod definitions;
pub mod device_class;
pub mod vmstate;
pub mod zeroable;
use std::{
alloc::{GlobalAlloc, Layout},
os::raw::c_void,
};
#[cfg(HAVE_GLIB_WITH_ALIGNED_ALLOC)]
extern "C" {
fn g_aligned_alloc0(
n_blocks: bindings::gsize,
n_block_bytes: bindings::gsize,
alignment: bindings::gsize,
) -> bindings::gpointer;
fn g_aligned_free(mem: bindings::gpointer);
}
#[cfg(not(HAVE_GLIB_WITH_ALIGNED_ALLOC))]
extern "C" {
fn qemu_memalign(alignment: usize, size: usize) -> *mut c_void;
fn qemu_vfree(ptr: *mut c_void);
}
extern "C" {
fn g_malloc0(n_bytes: bindings::gsize) -> bindings::gpointer;
fn g_free(mem: bindings::gpointer);
}
/// An allocator that uses the same allocator as QEMU in C.
///
/// It is enabled by default with the `allocator` feature.
///
/// To set it up manually as a global allocator in your crate:
///
/// ```ignore
/// use qemu_api::QemuAllocator;
///
/// #[global_allocator]
/// static GLOBAL: QemuAllocator = QemuAllocator::new();
/// ```
#[derive(Clone, Copy, Debug)]
#[repr(C)]
pub struct QemuAllocator {
_unused: [u8; 0],
}
#[cfg_attr(all(feature = "allocator", not(test)), global_allocator)]
pub static GLOBAL: QemuAllocator = QemuAllocator::new();
impl QemuAllocator {
// From the glibc documentation, on GNU systems, malloc guarantees 16-byte
// alignment on 64-bit systems and 8-byte alignment on 32-bit systems. See
// https://www.gnu.org/software/libc/manual/html_node/Malloc-Examples.html.
// This alignment guarantee also applies to Windows and Android. On Darwin
// and OpenBSD, the alignment is 16 bytes on both 64-bit and 32-bit systems.
#[cfg(all(
target_pointer_width = "32",
not(any(target_os = "macos", target_os = "openbsd"))
))]
pub const DEFAULT_ALIGNMENT_BYTES: Option<usize> = Some(8);
#[cfg(all(
target_pointer_width = "64",
not(any(target_os = "macos", target_os = "openbsd"))
))]
pub const DEFAULT_ALIGNMENT_BYTES: Option<usize> = Some(16);
#[cfg(all(
any(target_pointer_width = "32", target_pointer_width = "64"),
any(target_os = "macos", target_os = "openbsd")
))]
pub const DEFAULT_ALIGNMENT_BYTES: Option<usize> = Some(16);
#[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
pub const DEFAULT_ALIGNMENT_BYTES: Option<usize> = None;
pub const fn new() -> Self {
Self { _unused: [] }
}
}
impl Default for QemuAllocator {
fn default() -> Self {
Self::new()
}
}
// Sanity check.
const _: [(); 8] = [(); ::core::mem::size_of::<*mut c_void>()];
unsafe impl GlobalAlloc for QemuAllocator {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
if matches!(Self::DEFAULT_ALIGNMENT_BYTES, Some(default) if default.checked_rem(layout.align()) == Some(0))
{
// SAFETY: g_malloc0() is safe to call.
unsafe { g_malloc0(layout.size().try_into().unwrap()).cast::<u8>() }
} else {
#[cfg(HAVE_GLIB_WITH_ALIGNED_ALLOC)]
{
// SAFETY: g_aligned_alloc0() is safe to call.
unsafe {
g_aligned_alloc0(
layout.size().try_into().unwrap(),
1,
layout.align().try_into().unwrap(),
)
.cast::<u8>()
}
}
#[cfg(not(HAVE_GLIB_WITH_ALIGNED_ALLOC))]
{
// SAFETY: qemu_memalign() is safe to call.
unsafe { qemu_memalign(layout.align(), layout.size()).cast::<u8>() }
}
}
}
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
if matches!(Self::DEFAULT_ALIGNMENT_BYTES, Some(default) if default.checked_rem(layout.align()) == Some(0))
{
// SAFETY: `ptr` must have been allocated by Self::alloc thus a valid
// glib-allocated pointer, so `g_free`ing is safe.
unsafe { g_free(ptr.cast::<_>()) }
} else {
#[cfg(HAVE_GLIB_WITH_ALIGNED_ALLOC)]
{
// SAFETY: `ptr` must have been allocated by Self::alloc thus a valid aligned
// glib-allocated pointer, so `g_aligned_free`ing is safe.
unsafe { g_aligned_free(ptr.cast::<_>()) }
}
#[cfg(not(HAVE_GLIB_WITH_ALIGNED_ALLOC))]
{
// SAFETY: `ptr` must have been allocated by Self::alloc thus a valid aligned
// glib-allocated pointer, so `qemu_vfree`ing is safe.
unsafe { qemu_vfree(ptr.cast::<_>()) }
}
}
}
}
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