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This commit is an implementation of [RFC 1183][rfc] which allows swapping out the default allocator on nightly Rust. No new stable surface area should be added as a part of this commit. [rfc]: https://github.com/rust-lang/rfcs/pull/1183 Two new attributes have been added to the compiler: * `#![needs_allocator]` - this is used by liballoc (and likely only liballoc) to indicate that it requires an allocator crate to be in scope. * `#![allocator]` - this is a indicator that the crate is an allocator which can satisfy the `needs_allocator` attribute above. The ABI of the allocator crate is defined to be a set of symbols that implement the standard Rust allocation/deallocation functions. The symbols are not currently checked for exhaustiveness or typechecked. There are also a number of restrictions on these crates: * An allocator crate cannot transitively depend on a crate that is flagged as needing an allocator (e.g. allocator crates can't depend on liballoc). * There can only be one explicitly linked allocator in a final image. * If no allocator is explicitly requested one will be injected on behalf of the compiler. Binaries and Rust dylibs will use jemalloc by default where available and staticlibs/other dylibs will use the system allocator by default. Two allocators are provided by the distribution by default, `alloc_system` and `alloc_jemalloc` which operate as advertised. Closes #27389 |
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| compiler-rt@58ab642c30 | ||
| compiletest | ||
| doc | ||
| driver | ||
| error-index-generator | ||
| etc | ||
| grammar | ||
| jemalloc@e24a1a025a | ||
| liballoc | ||
| liballoc_jemalloc | ||
| liballoc_system | ||
| libarena | ||
| libbacktrace | ||
| libcollections | ||
| libcollectionstest | ||
| libcore | ||
| libcoretest | ||
| libflate | ||
| libfmt_macros | ||
| libgetopts | ||
| libgraphviz | ||
| liblibc | ||
| liblog | ||
| librand | ||
| librbml | ||
| librustc | ||
| librustc_back | ||
| librustc_bitflags | ||
| librustc_borrowck | ||
| librustc_data_structures | ||
| librustc_driver | ||
| librustc_lint | ||
| librustc_llvm | ||
| librustc_privacy | ||
| librustc_resolve | ||
| librustc_trans | ||
| librustc_typeck | ||
| librustc_unicode | ||
| librustdoc | ||
| libserialize | ||
| libstd | ||
| libsyntax | ||
| libterm | ||
| libtest | ||
| llvm@874dc4ee4c | ||
| rt | ||
| rust-installer@c37d3747da | ||
| rustbook | ||
| rustllvm | ||
| test | ||
| snapshots.txt | ||