std: begin moving platform support modules into `pal`

1 files changed, 0 insertions, 106 deletions

diff --git a/library/std/src/sys/unix/alloc.rs b/library/std/src/sys/unix/alloc.rs
deleted file mode 100644
index af0089978ec..00000000000
--- a/library/std/src/sys/unix/alloc.rs
+++ /dev/null
@@ -1,106 +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 {
-            #[cfg(target_os = "macos")]
-            {
-                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! {
-    if #[cfg(any(
-        target_os = "android",
-        target_os = "illumos",
-        target_os = "redox",
-        target_os = "solaris",
-        target_os = "espidf",
-        target_os = "horizon",
-        target_os = "vita",
-    ))] {
-        #[inline]
-        unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-            // On android we currently target API level 9 which unfortunately
-            // doesn't have the `posix_memalign` API used below. Instead we use
-            // `memalign`, but this unfortunately has the property on some systems
-            // where the memory returned cannot be deallocated by `free`!
-            //
-            // Upon closer inspection, however, this appears to work just fine with
-            // Android, so for this platform we should be fine to call `memalign`
-            // (which is present in API level 9). Some helpful references could
-            // possibly be chromium using memalign [1], attempts at documenting that
-            // memalign + free is ok [2] [3], or the current source of chromium
-            // which still uses memalign on android [4].
-            //
-            // [1]: https://codereview.chromium.org/10796020/
-            // [2]: https://code.google.com/p/android/issues/detail?id=35391
-            // [3]: https://bugs.chromium.org/p/chromium/issues/detail?id=138579
-            // [4]: https://chromium.googlesource.com/chromium/src/base/+/master/
-            //                                       /memory/aligned_memory.cc
-            libc::memalign(layout.align(), layout.size()) as *mut u8
-        }
-    } else if #[cfg(target_os = "wasi")] {
-        #[inline]
-        unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-            // C11 aligned_alloc requires that the size be a multiple of the alignment.
-            // Layout already checks that the size rounded up doesn't overflow isize::MAX.
-            let align = layout.align();
-            let size = layout.size().next_multiple_of(align);
-            libc::aligned_alloc(align, size) as *mut u8
-        }
-    } else {
-        #[inline]
-        unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
-            let mut out = ptr::null_mut();
-            // posix_memalign requires 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 }
-        }
-    }
-}