# `stack-sizes` > Library to parse the stack usage (`.stack_sizes`) information emitted by LLVM ## Background information Since ` nightly-2018-09-27` `rustc` has a (nightly only) [`-Z emit-stack-sizes`] flag to (make LLVM) emit stack usage information for each Rust function. [`-Z emit-stack-sizes`]: https://doc.rust-lang.org/nightly/unstable-book/compiler-flags/emit-stack-sizes.html > **NOTE**: This feature only works when the output artifact has the ELF object > format. The `stack-sizes` library provides an API to parse the metadata emitted by that flag. ## License Licensed under either of - Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) - MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) at your option. ### Contribution Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.