#stack-frame #stack-trace #run-time #symbols #capture #panics #symbol-name

no-std backtrace

A library to acquire a stack trace (backtrace) at runtime in a Rust program

82 releases

0.3.71 Mar 22, 2024
0.3.69 Aug 22, 2023
0.3.68 Jun 29, 2023
0.3.67 Dec 14, 2022
0.1.4 Jul 16, 2015

#4 in Debugging

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5,266,902 downloads per month
Used in 28,926 crates (442 directly)

MIT/Apache

260KB
5.5K SLoC

backtrace-rs

Documentation

A library for acquiring backtraces at runtime for Rust. This library aims to enhance the support of the standard library by providing a programmatic interface to work with, but it also supports simply easily printing the current backtrace like libstd's panics.

Install

[dependencies]
backtrace = "0.3"

Usage

To simply capture a backtrace and defer dealing with it until a later time, you can use the top-level Backtrace type.

use backtrace::Backtrace;

fn main() {
    let bt = Backtrace::new();

    // do_some_work();

    println!("{bt:?}");
}

If, however, you'd like more raw access to the actual tracing functionality, you can use the trace and resolve functions directly.

fn main() {
    backtrace::trace(|frame| {
        let ip = frame.ip();
        let symbol_address = frame.symbol_address();

        // Resolve this instruction pointer to a symbol name
        backtrace::resolve_frame(frame, |symbol| {
            if let Some(name) = symbol.name() {
                // ...
            }
            if let Some(filename) = symbol.filename() {
                // ...
            }
        });

        true // keep going to the next frame
    });
}

Supported Rust Versions

The backtrace crate is a core component of the standard library, and must at times keep up with the evolution of various platforms in order to serve the standard library's needs. This often means using recent libraries that provide unwinding and symbolication for various platforms. Thus backtrace is likely to use recent Rust features or depend on a library which itself uses them. Its minimum supported Rust version, by policy, is within a few versions of current stable, approximately "stable - 2".

This policy takes precedence over versions written anywhere else in this repo.

License

This project is licensed under either of

at your option.

Contribution

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

Dependencies

~2.3–4MB
~76K SLoC