Merge of rust-lang/backtrace-rs#729: Optimize proc maps parsing code size The current code size is really wastefully large. Originally, it was 1500 lines of assembly in Godbolt, now I reduced it to just under 800. The effect of .text size in hello world is from 297028 to 295453 (measured with -Clto=fat -Copt-level=s with a normal sysroot) which is small but not completely irrelevant. It's just a small fish in the bigger pond of DWARF parsing, but it's better than nothing.
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.
[dependencies] backtrace = "0.3"
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 }); }
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.
This project is licensed under either of
at your option.
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.