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Diffstat (limited to 'vendor/backtrace/src/lib.rs')
| -rw-r--r-- | vendor/backtrace/src/lib.rs | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/vendor/backtrace/src/lib.rs b/vendor/backtrace/src/lib.rs new file mode 100644 index 0000000..4615e1f --- /dev/null +++ b/vendor/backtrace/src/lib.rs @@ -0,0 +1,192 @@ +//! A library for acquiring a backtrace at runtime +//! +//! This library is meant to supplement the `RUST_BACKTRACE=1` support of the +//! standard library by allowing an acquisition of a backtrace at runtime +//! programmatically. The backtraces generated by this library do not need to be +//! parsed, for example, and expose the functionality of multiple backend +//! implementations. +//! +//! # Usage +//! +//! First, add this to your Cargo.toml +//! +//! ```toml +//! [dependencies] +//! backtrace = "0.3" +//! ``` +//! +//! Next: +//! +//! ``` +//! fn main() { +//! # // Unsafe here so test passes on no_std. +//! # #[cfg(feature = "std")] { +//! 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 +//! }); +//! } +//! # } +//! ``` +//! +//! # Backtrace accuracy +//! +//! This crate implements best-effort attempts to get the native backtrace. This +//! is not always guaranteed to work, and some platforms don't return any +//! backtrace at all. If your application requires accurate backtraces then it's +//! recommended to closely evaluate this crate to see whether it's suitable +//! for your use case on your target platforms. +//! +//! Even on supported platforms, there's a number of reasons that backtraces may +//! be less-than-accurate, including but not limited to: +//! +//! * Unwind information may not be available. This crate primarily implements +//! backtraces by unwinding the stack, but not all functions may have +//! unwinding information (e.g. DWARF unwinding information). +//! +//! * Rust code may be compiled without unwinding information for some +//! functions. This can also happen for Rust code compiled with +//! `-Cpanic=abort`. You can remedy this, however, with +//! `-Cforce-unwind-tables` as a compiler option. +//! +//! * Unwind information may be inaccurate or corrupt. In the worst case +//! inaccurate unwind information can lead this library to segfault. In the +//! best case inaccurate information will result in a truncated stack trace. +//! +//! * Backtraces may not report filenames/line numbers correctly due to missing +//! or corrupt debug information. This won't lead to segfaults unlike corrupt +//! unwinding information, but missing or malformed debug information will +//! mean that filenames and line numbers will not be available. This may be +//! because debug information wasn't generated by the compiler, or it's just +//! missing on the filesystem. +//! +//! * Not all platforms are supported. For example there's no way to get a +//! backtrace on WebAssembly at the moment. +//! +//! * Crate features may be disabled. Currently this crate supports using Gimli +//! libbacktrace on non-Windows platforms for reading debuginfo for +//! backtraces. If both crate features are disabled, however, then these +//! platforms will generate a backtrace but be unable to generate symbols for +//! it. +//! +//! In most standard workflows for most standard platforms you generally don't +//! need to worry about these caveats. We'll try to fix ones where we can over +//! time, but otherwise it's important to be aware of the limitations of +//! unwinding-based backtraces! + +#![deny(missing_docs)] +#![no_std] +#![cfg_attr( + all(feature = "std", target_env = "sgx", target_vendor = "fortanix"), + feature(sgx_platform) +)] +#![warn(rust_2018_idioms)] +// When we're building as part of libstd, silence all warnings since they're +// irrelevant as this crate is developed out-of-tree. +#![cfg_attr(backtrace_in_libstd, allow(warnings))] +#![cfg_attr(not(feature = "std"), allow(dead_code))] +// We know this is deprecated, it's only here for back-compat reasons. +#![cfg_attr(feature = "rustc-serialize", allow(deprecated))] + +#[cfg(feature = "std")] +#[macro_use] +extern crate std; + +// This is only used for gimli right now, which is only used on some platforms, and miri +// so don't worry if it's unused in other configurations. +#[allow(unused_extern_crates)] +extern crate alloc; + +pub use self::backtrace::{trace_unsynchronized, Frame}; +mod backtrace; + +pub use self::symbolize::resolve_frame_unsynchronized; +pub use self::symbolize::{resolve_unsynchronized, Symbol, SymbolName}; +mod symbolize; + +pub use self::types::BytesOrWideString; +mod types; + +#[cfg(feature = "std")] +pub use self::symbolize::clear_symbol_cache; + +mod print; +pub use print::{BacktraceFmt, BacktraceFrameFmt, PrintFmt}; + +cfg_if::cfg_if! { + if #[cfg(feature = "std")] { + pub use self::backtrace::trace; + pub use self::symbolize::{resolve, resolve_frame}; + pub use self::capture::{Backtrace, BacktraceFrame, BacktraceSymbol}; + mod capture; + } +} + +#[allow(dead_code)] +struct Bomb { + enabled: bool, +} + +#[allow(dead_code)] +impl Drop for Bomb { + fn drop(&mut self) { + if self.enabled { + panic!("cannot panic during the backtrace function"); + } + } +} + +#[allow(dead_code)] +#[cfg(feature = "std")] +mod lock { + use std::boxed::Box; + use std::cell::Cell; + use std::sync::{Mutex, MutexGuard, Once}; + + pub struct LockGuard(Option<MutexGuard<'static, ()>>); + + static mut LOCK: *mut Mutex<()> = 0 as *mut _; + static INIT: Once = Once::new(); + thread_local!(static LOCK_HELD: Cell<bool> = Cell::new(false)); + + impl Drop for LockGuard { + fn drop(&mut self) { + if self.0.is_some() { + LOCK_HELD.with(|slot| { + assert!(slot.get()); + slot.set(false); + }); + } + } + } + + pub fn lock() -> LockGuard { + if LOCK_HELD.with(|l| l.get()) { + return LockGuard(None); + } + LOCK_HELD.with(|s| s.set(true)); + unsafe { + INIT.call_once(|| { + LOCK = Box::into_raw(Box::new(Mutex::new(()))); + }); + LockGuard(Some((*LOCK).lock().unwrap())) + } + } +} + +#[cfg(all(windows, not(target_vendor = "uwp")))] +mod dbghelp; +#[cfg(windows)] +mod windows; |