Auto merge of #42727 - alexcrichton:allocators-new, r=eddyb

rustc: Implement the #[global_allocator] attribute

This PR is an implementation of [RFC 1974] which specifies a new method of
defining a global allocator for a program. This obsoletes the old
`#![allocator]` attribute and also removes support for it.

[RFC 1974]: https://github.com/rust-lang/rfcs/pull/1974

The new `#[global_allocator]` attribute solves many issues encountered with the
`#![allocator]` attribute such as composition and restrictions on the crate
graph itself. The compiler now has much more control over the ABI of the
allocator and how it's implemented, allowing much more freedom in terms of how
this feature is implemented.

cc #27389

1 files changed, 21 insertions, 2 deletions

diff --git a/src/liballoc/allocator.rs b/src/liballoc/allocator.rs
index bf38629ed38..ca5388b4701 100644
--- a/src/liballoc/allocator.rs
+++ b/src/liballoc/allocator.rs
@@ -13,7 +13,7 @@
                       slightly, especially to possibly take into account the \
                       types being stored to make room for a future \
                       tracing garbage collector",
-            issue = "27700")]
+            issue = "32838")]
 
 use core::cmp;
 use core::fmt;
@@ -73,6 +73,7 @@ impl Layout {
     /// * `size`, when rounded up to the nearest multiple of `align`,
     ///    must not overflow (i.e. the rounded value must be less than
     ///    `usize::MAX`).
+    #[inline]
     pub fn from_size_align(size: usize, align: usize) -> Option<Layout> {
         if !align.is_power_of_two() {
             return None;
@@ -96,13 +97,28 @@ impl Layout {
             return None;
         }
 
-        Some(Layout { size: size, align: align })
+        unsafe {
+            Some(Layout::from_size_align_unchecked(size, align))
+        }
+    }
+
+    /// Creates a layout, bypassing all checks.
+    ///
+    /// # Unsafety
+    ///
+    /// This function is unsafe as it does not verify that `align` is a power of
+    /// two nor that `size` aligned to `align` fits within the address space.
+    #[inline]
+    pub unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Layout {
+        Layout { size: size, align: align }
     }
 
     /// The minimum size in bytes for a memory block of this layout.
+    #[inline]
     pub fn size(&self) -> usize { self.size }
 
     /// The minimum byte alignment for a memory block of this layout.
+    #[inline]
     pub fn align(&self) -> usize { self.align }
 
     /// Constructs a `Layout` suitable for holding a value of type `T`.
@@ -135,6 +151,7 @@ impl Layout {
     ///
     /// Panics if the combination of `self.size` and the given `align`
     /// violates the conditions listed in `from_size_align`.
+    #[inline]
     pub fn align_to(&self, align: usize) -> Self {
         Layout::from_size_align(self.size, cmp::max(self.align, align)).unwrap()
     }
@@ -155,6 +172,7 @@ impl Layout {
     /// to be less than or equal to the alignment of the starting
     /// address for the whole allocated block of memory. One way to
     /// satisfy this constraint is to ensure `align <= self.align`.
+    #[inline]
     pub fn padding_needed_for(&self, align: usize) -> usize {
         let len = self.size();
 
@@ -556,6 +574,7 @@ pub unsafe trait Alloc {
     /// However, for clients that do not wish to track the capacity
     /// returned by `alloc_excess` locally, this method is likely to
     /// produce useful results.
+    #[inline]
     fn usable_size(&self, layout: &Layout) -> (usize, usize) {
         (layout.size(), layout.size())
     }