A cargo subcommand that displays the assembly generated for a function. cargo-disasm does not require recompiling your project, it disassembles and finds symbols in your binary directly.

This is still under heavy development

For now cargo-disasm can disassemble symbols from ELF (Linux), Mach (MacOS), an PE/COFF (Windows) object files for binary crates and make use of DWARF and PDB debug information for symbol discovery. Check here to see the current progress.

cargo install cargo-disasm

To view the assembly of a function foo::bar::baz(), a function baz in module bar in crate foo, the subcommand can be run from your crate's root directory:

# Make sure that your project has a binary to disassemble first:
cargo build
cargo disasm foo::bar::baz

Sometimes cargo-disasm has trouble finding your symbols in release mode. To make sure that cargo-disasm is searching all sources available, --symsrc=all can be passed as an argument like so:

# Make sure that your project has a release binary to disassemble first:
cargo build --release
cargo disasm --release --symsrc=all foo::bar::baz

This solution is temporary and the default --symsrc=auto should be able to figure this out on its own soon.

• Showing source code alongside disassembly (DWARF only, PDB not yet supported)

Windows

• PE/COFF file disassembly and symbol discovery
• use PDB for symbol discovery (MSVC toolchain)
• use DWARF for symbol discovery (GNU)

MacOS

• Mach file disassembly and symbol discovery
• use dSYM (DWARF) for symbol discovery

Linux

• ELF file disassembly and symbol discovery
• use DWARF for symbol discovery

Line Information

• use DWARF for line information
• use PDB for line information

Postponed

• Syntax highlighting for disassembly (good for higher level source code, unecessary for assembly)
• Optional arrows for displaying jump sources and targets (too noisy)