cargo-asm

A cargo subcommand that displays the assembly or llvm-ir generated for Rust source code.

Install

cargo install cargo-asm

Example

To view the assembly of the function double_n in the module bar of the crate lib_crate annotated with its corresponding Rust code, go to the crate's root directory

git clone git@github.com:gnzlbg/cargo-asm.git
cd cargo-asm/cargo-asm-test/lib_crate

and type:

cargo asm lib_crate::bar::double_n --rust

which outputs:

screenshot

(note: the source-code mapping information emitted by rustc after optimizations is sometimes far from perfect, like in this case. Take it with a grain of salt.)

To view the LLVM IR type

cargo llvm-ir lib_crate::bar::double_n

Features

Platform support:
- OS: Linux, Windows, and MacOSX.
- Rust: nightly and stable.
- Architectures: x86, x86_64, arm, aarch64, powerpc, mips, sparc.
Displaying:
- Assembly in Intel or AT&T syntax.
- Corresponding Rust source code alongside assembly.
- JSON AST for further processing.
- LLVM-IR.
Querying:
- functions, for example: foo:
```
cargo asm crate::path::to::foo
```
- inherent method, for example: foo of a type Foo (that is, Foo::foo):
```
cargo asm crate::path::to::Foo::foo
```
- trait method implementations, for example: bar of the trait Bar for the type Foo:
```
cargo asm "<crate::path::to::Foo as crate::path::to::Bar>::bar"
```
- generic functions, methods, ...

To search for a function named foo in some path, one can just type cargo asm foo. The command will return a list of all similarly named functions independently of the path.

License

This project is licensed under either of

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.