backtrace 0.3.35

A library to acquire a stack trace (backtrace) at runtime in a Rust program.
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# backtrace-rs

[![Build Status](https://dev.azure.com/rust-lang/backtrace-rs/_apis/build/status/rust-lang.backtrace-rs?branchName=master)](https://dev.azure.com/rust-lang/backtrace-rs/_build/latest?definitionId=12&branchName=master)

[Documentation](https://docs.rs/backtrace)

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

```toml
[dependencies]
backtrace = "0.3"
```

Note that this crate requires `cc` and `ar` to be present on Unix systems when
`libbacktrace` is used (which is the default). For configuring C compilers see
the [`cc` crate documentation](https://github.com/alexcrichton/cc-rs).

## Usage

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

```rust
extern crate backtrace;

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.

```rust
extern crate backtrace;

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
    });
}
```

# License

This project is 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 backtrace-rs by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.