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| author | Mara Bos <m-ou.se@m-ou.se> | 2020-11-17 10:06:23 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-11-17 10:06:23 +0100 |
| commit | 70a4e433b1de88bd520582c7cfd035d6dd658925 (patch) | |
| tree | 84ad96456943475c36dfe5da28fe3f80feb12eaf /library/alloc/src | |
| parent | 336dc18aa3bfe073894f7f467706f90a456d65fc (diff) | |
| parent | af869c2f8dea8efb2a2d10a44d200cb769b4956c (diff) | |
| download | rust-70a4e433b1de88bd520582c7cfd035d6dd658925.tar.gz rust-70a4e433b1de88bd520582c7cfd035d6dd658925.zip | |
Rollup merge of #79077 - RalfJung:llvm-magic, r=Mark-Simulacrum
document that __rust_alloc is also magic to our LLVM fork Based on [comments](https://github.com/rust-lang/rust/pull/79045#discussion_r523442198) by ````@tmiasko```` and ````@bjorn3.````
Diffstat (limited to 'library/alloc/src')
| -rw-r--r-- | library/alloc/src/alloc.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/library/alloc/src/alloc.rs b/library/alloc/src/alloc.rs index 0a4f88dedbb..3427c83a18f 100644 --- a/library/alloc/src/alloc.rs +++ b/library/alloc/src/alloc.rs @@ -23,6 +23,8 @@ extern "Rust" { // (the code expanding that attribute macro generates those functions), or to call // the default implementations in libstd (`__rdl_alloc` etc. in `library/std/src/alloc.rs`) // otherwise. + // The rustc fork of LLVM also special-cases these function names to be able to optimize them + // like `malloc`, `realloc`, and `free`, respectively. #[rustc_allocator] #[rustc_allocator_nounwind] fn __rust_alloc(size: usize, align: usize) -> *mut u8; |