54 lines
2.1 KiB
Rust
54 lines
2.1 KiB
Rust
use crate::alloc::{GlobalAlloc, Layout, System};
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use super::waitqueue::SpinMutex;
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// Using a SpinMutex because we never want to exit the enclave waiting for the
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// allocator.
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//
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// The current allocator here is the `dlmalloc` crate which we've got included
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// in the rust-lang/rust repository as a submodule. The crate is a port of
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// dlmalloc.c from C to Rust.
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#[cfg_attr(test, linkage = "available_externally")]
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#[export_name = "_ZN16__rust_internals3std3sys3sgx5alloc8DLMALLOCE"]
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static DLMALLOC: SpinMutex<dlmalloc::Dlmalloc> = SpinMutex::new(dlmalloc::DLMALLOC_INIT);
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#[stable(feature = "alloc_system_type", since = "1.28.0")]
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unsafe impl GlobalAlloc for System {
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#[inline]
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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// SAFETY: the caller must uphold the safety contract for `malloc`
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unsafe { DLMALLOC.lock().malloc(layout.size(), layout.align()) }
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}
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#[inline]
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unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
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// SAFETY: the caller must uphold the safety contract for `malloc`
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unsafe { DLMALLOC.lock().calloc(layout.size(), layout.align()) }
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}
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#[inline]
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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// SAFETY: the caller must uphold the safety contract for `malloc`
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unsafe { DLMALLOC.lock().free(ptr, layout.size(), layout.align()) }
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}
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#[inline]
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unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
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// SAFETY: the caller must uphold the safety contract for `malloc`
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unsafe { DLMALLOC.lock().realloc(ptr, layout.size(), layout.align(), new_size) }
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}
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}
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// The following functions are needed by libunwind. These symbols are named
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// in pre-link args for the target specification, so keep that in sync.
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#[cfg(not(test))]
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#[no_mangle]
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pub unsafe extern "C" fn __rust_c_alloc(size: usize, align: usize) -> *mut u8 {
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unsafe { crate::alloc::alloc(Layout::from_size_align_unchecked(size, align)) }
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}
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#[cfg(not(test))]
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#[no_mangle]
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pub unsafe extern "C" fn __rust_c_dealloc(ptr: *mut u8, size: usize, align: usize) {
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unsafe { crate::alloc::dealloc(ptr, Layout::from_size_align_unchecked(size, align)) }
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}
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