std: move allocators to `sys`

1 files changed, 0 insertions, 88 deletions

diff --git a/library/std/src/sys/pal/unix/alloc.rs b/library/std/src/sys/pal/unix/alloc.rs
deleted file mode 100644
index 625ba5247f1..00000000000
--- a/library/std/src/sys/pal/unix/alloc.rs
+++ /dev/null
@@ -1,88 +0,0 @@
-use crate::alloc::{GlobalAlloc, Layout, System};
-use crate::ptr;
-use crate::sys::common::alloc::{realloc_fallback, MIN_ALIGN};
-
-#[stable(feature = "alloc_system_type", since = "1.28.0")]
-unsafe impl GlobalAlloc for System {
-    #[inline]
-    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        // jemalloc provides alignment less than MIN_ALIGN for small allocations.
-        // So only rely on MIN_ALIGN if size >= align.
-        // Also see <https://github.com/rust-lang/rust/issues/45955> and
-        // <https://github.com/rust-lang/rust/issues/62251#issuecomment-507580914>.
-        if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::malloc(layout.size()) as *mut u8
-        } else {
-            // `posix_memalign` returns a non-aligned value if supplied a very
-            // large alignment on older versions of Apple's platforms (unknown
-            // exactly which version range, but the issue is definitely
-            // present in macOS 10.14 and iOS 13.3).
-            //
-            // <https://github.com/rust-lang/rust/issues/30170>
-            #[cfg(target_vendor = "apple")]
-            {
-                if layout.align() > (1 << 31) {
-                    return ptr::null_mut();
-                }
-            }
-            aligned_malloc(&layout)
-        }
-    }
-
-    #[inline]
-    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
-        // See the comment above in `alloc` for why this check looks the way it does.
-        if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
-            libc::calloc(layout.size(), 1) as *mut u8
-        } else {
-            let ptr = self.alloc(layout);
-            if !ptr.is_null() {
-                ptr::write_bytes(ptr, 0, layout.size());
-            }
-            ptr
-        }
-    }
-
-    #[inline]
-    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
-        libc::free(ptr as *mut libc::c_void)
-    }
-
-    #[inline]
-    unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
-        if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
-            libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
-        } else {
-            realloc_fallback(self, ptr, layout, new_size)
-        }
-    }
-}
-
-cfg_if::cfg_if! {
-    // We use posix_memalign wherever possible, but some targets have very incomplete POSIX coverage
-    // so we need a fallback for those.
-    if #[cfg(any(
-        target_os = "horizon",
-        target_os = "vita",
-    ))] {
-        #[inline]
-        unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-            unsafe { libc::memalign(layout.align(), layout.size()) as *mut u8 }
-        }
-    } else {
-        #[inline]
-        unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-            let mut out = ptr::null_mut();
-            // We prefer posix_memalign over aligned_alloc since it is more widely available, and
-            // since with aligned_alloc, implementations are making almost arbitrary choices for
-            // which alignments are "supported", making it hard to use. For instance, some
-            // implementations require the size to be a multiple of the alignment (wasi emmalloc),
-            // while others require the alignment to be at least the pointer size (Illumos, macOS).
-            // posix_memalign only has one, clear requirement: that the alignment be a multiple of
-            // `sizeof(void*)`. Since these are all powers of 2, we can just use max.
-            let align = layout.align().max(crate::mem::size_of::<usize>());
-            let ret = libc::posix_memalign(&mut out, align, layout.size());
-            if ret != 0 { ptr::null_mut() } else { out as *mut u8 }
-        }
-    }
-}