556 lines
18 KiB
Rust
556 lines
18 KiB
Rust
use crate::PrintFmt;
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use crate::{resolve, resolve_frame, trace, BacktraceFmt, Symbol, SymbolName};
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use std::ffi::c_void;
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use std::fmt;
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use std::path::{Path, PathBuf};
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use std::prelude::v1::*;
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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/// Representation of an owned and self-contained backtrace.
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///
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/// This structure can be used to capture a backtrace at various points in a
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/// program and later used to inspect what the backtrace was at that time.
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///
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/// `Backtrace` supports pretty-printing of backtraces through its `Debug`
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/// implementation.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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#[derive(Clone)]
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#[cfg_attr(feature = "serialize-rustc", derive(RustcDecodable, RustcEncodable))]
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#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
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pub struct Backtrace {
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// Frames here are listed from top-to-bottom of the stack
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frames: Vec<BacktraceFrame>,
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// The index we believe is the actual start of the backtrace, omitting
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// frames like `Backtrace::new` and `backtrace::trace`.
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actual_start_index: usize,
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}
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fn _assert_send_sync() {
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fn _assert<T: Send + Sync>() {}
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_assert::<Backtrace>();
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}
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/// Captured version of a frame in a backtrace.
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///
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/// This type is returned as a list from `Backtrace::frames` and represents one
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/// stack frame in a captured backtrace.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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#[derive(Clone)]
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pub struct BacktraceFrame {
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frame: Frame,
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symbols: Option<Vec<BacktraceSymbol>>,
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}
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#[derive(Clone)]
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enum Frame {
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Raw(crate::Frame),
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#[allow(dead_code)]
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Deserialized {
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ip: usize,
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symbol_address: usize,
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module_base_address: Option<usize>,
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},
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}
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impl Frame {
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fn ip(&self) -> *mut c_void {
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match *self {
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Frame::Raw(ref f) => f.ip(),
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Frame::Deserialized { ip, .. } => ip as *mut c_void,
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}
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}
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fn symbol_address(&self) -> *mut c_void {
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match *self {
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Frame::Raw(ref f) => f.symbol_address(),
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Frame::Deserialized { symbol_address, .. } => symbol_address as *mut c_void,
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}
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}
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fn module_base_address(&self) -> Option<*mut c_void> {
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match *self {
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Frame::Raw(ref f) => f.module_base_address(),
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Frame::Deserialized {
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module_base_address,
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..
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} => module_base_address.map(|addr| addr as *mut c_void),
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}
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}
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}
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/// Captured version of a symbol in a backtrace.
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///
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/// This type is returned as a list from `BacktraceFrame::symbols` and
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/// represents the metadata for a symbol in a backtrace.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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#[derive(Clone)]
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#[cfg_attr(feature = "serialize-rustc", derive(RustcDecodable, RustcEncodable))]
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#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
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pub struct BacktraceSymbol {
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name: Option<Vec<u8>>,
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addr: Option<usize>,
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filename: Option<PathBuf>,
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lineno: Option<u32>,
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colno: Option<u32>,
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}
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impl Backtrace {
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/// Captures a backtrace at the callsite of this function, returning an
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/// owned representation.
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///
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/// This function is useful for representing a backtrace as an object in
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/// Rust. This returned value can be sent across threads and printed
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/// elsewhere, and the purpose of this value is to be entirely self
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/// contained.
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///
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/// Note that on some platforms acquiring a full backtrace and resolving it
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/// can be extremely expensive. If the cost is too much for your application
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/// it's recommended to instead use `Backtrace::new_unresolved()` which
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/// avoids the symbol resolution step (which typically takes the longest)
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/// and allows deferring that to a later date.
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///
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/// # Examples
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///
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/// ```
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/// use backtrace::Backtrace;
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///
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/// let current_backtrace = Backtrace::new();
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/// ```
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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#[inline(never)] // want to make sure there's a frame here to remove
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pub fn new() -> Backtrace {
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let mut bt = Self::create(Self::new as usize);
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bt.resolve();
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bt
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}
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/// Similar to `new` except that this does not resolve any symbols, this
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/// simply captures the backtrace as a list of addresses.
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///
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/// At a later time the `resolve` function can be called to resolve this
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/// backtrace's symbols into readable names. This function exists because
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/// the resolution process can sometimes take a significant amount of time
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/// whereas any one backtrace may only be rarely printed.
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///
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/// # Examples
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///
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/// ```
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/// use backtrace::Backtrace;
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///
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/// let mut current_backtrace = Backtrace::new_unresolved();
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/// println!("{:?}", current_backtrace); // no symbol names
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/// current_backtrace.resolve();
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/// println!("{:?}", current_backtrace); // symbol names now present
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/// ```
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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#[inline(never)] // want to make sure there's a frame here to remove
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pub fn new_unresolved() -> Backtrace {
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Self::create(Self::new_unresolved as usize)
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}
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fn create(ip: usize) -> Backtrace {
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let mut frames = Vec::new();
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let mut actual_start_index = None;
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trace(|frame| {
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frames.push(BacktraceFrame {
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frame: Frame::Raw(frame.clone()),
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symbols: None,
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});
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if frame.symbol_address() as usize == ip && actual_start_index.is_none() {
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actual_start_index = Some(frames.len());
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}
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true
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});
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Backtrace {
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frames,
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actual_start_index: actual_start_index.unwrap_or(0),
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}
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}
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/// Returns the frames from when this backtrace was captured.
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///
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/// The first entry of this slice is likely the function `Backtrace::new`,
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/// and the last frame is likely something about how this thread or the main
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/// function started.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn frames(&self) -> &[BacktraceFrame] {
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&self.frames[self.actual_start_index..]
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}
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/// If this backtrace was created from `new_unresolved` then this function
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/// will resolve all addresses in the backtrace to their symbolic names.
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///
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/// If this backtrace has been previously resolved or was created through
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/// `new`, this function does nothing.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn resolve(&mut self) {
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for frame in self.frames.iter_mut().filter(|f| f.symbols.is_none()) {
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let mut symbols = Vec::new();
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{
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let sym = |symbol: &Symbol| {
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symbols.push(BacktraceSymbol {
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name: symbol.name().map(|m| m.as_bytes().to_vec()),
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addr: symbol.addr().map(|a| a as usize),
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filename: symbol.filename().map(|m| m.to_owned()),
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lineno: symbol.lineno(),
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colno: symbol.colno(),
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});
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};
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match frame.frame {
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Frame::Raw(ref f) => resolve_frame(f, sym),
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Frame::Deserialized { ip, .. } => {
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resolve(ip as *mut c_void, sym);
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}
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}
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}
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frame.symbols = Some(symbols);
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}
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}
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}
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impl From<Vec<BacktraceFrame>> for Backtrace {
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fn from(frames: Vec<BacktraceFrame>) -> Self {
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Backtrace {
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frames,
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actual_start_index: 0,
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}
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}
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}
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impl From<crate::Frame> for BacktraceFrame {
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fn from(frame: crate::Frame) -> BacktraceFrame {
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BacktraceFrame {
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frame: Frame::Raw(frame),
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symbols: None,
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}
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}
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}
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impl Into<Vec<BacktraceFrame>> for Backtrace {
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fn into(self) -> Vec<BacktraceFrame> {
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self.frames
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}
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}
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impl BacktraceFrame {
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/// Same as `Frame::ip`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn ip(&self) -> *mut c_void {
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self.frame.ip() as *mut c_void
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}
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/// Same as `Frame::symbol_address`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn symbol_address(&self) -> *mut c_void {
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self.frame.symbol_address() as *mut c_void
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}
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/// Same as `Frame::module_base_address`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn module_base_address(&self) -> Option<*mut c_void> {
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self.frame
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.module_base_address()
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.map(|addr| addr as *mut c_void)
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}
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/// Returns the list of symbols that this frame corresponds to.
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///
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/// Normally there is only one symbol per frame, but sometimes if a number
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/// of functions are inlined into one frame then multiple symbols will be
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/// returned. The first symbol listed is the "innermost function", whereas
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/// the last symbol is the outermost (last caller).
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///
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/// Note that if this frame came from an unresolved backtrace then this will
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/// return an empty list.
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn symbols(&self) -> &[BacktraceSymbol] {
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self.symbols.as_ref().map(|s| &s[..]).unwrap_or(&[])
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}
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}
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impl BacktraceSymbol {
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/// Same as `Symbol::name`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn name(&self) -> Option<SymbolName<'_>> {
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self.name.as_ref().map(|s| SymbolName::new(s))
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}
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/// Same as `Symbol::addr`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn addr(&self) -> Option<*mut c_void> {
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self.addr.map(|s| s as *mut c_void)
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}
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/// Same as `Symbol::filename`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn filename(&self) -> Option<&Path> {
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self.filename.as_ref().map(|p| &**p)
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}
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/// Same as `Symbol::lineno`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn lineno(&self) -> Option<u32> {
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self.lineno
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}
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/// Same as `Symbol::colno`
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///
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/// # Required features
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///
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/// This function requires the `std` feature of the `backtrace` crate to be
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/// enabled, and the `std` feature is enabled by default.
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pub fn colno(&self) -> Option<u32> {
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self.colno
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}
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}
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impl fmt::Debug for Backtrace {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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let full = fmt.alternate();
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let (frames, style) = if full {
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(&self.frames[..], PrintFmt::Full)
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} else {
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(&self.frames[self.actual_start_index..], PrintFmt::Short)
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};
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// When printing paths we try to strip the cwd if it exists, otherwise
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// we just print the path as-is. Note that we also only do this for the
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// short format, because if it's full we presumably want to print
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// everything.
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let cwd = std::env::current_dir();
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let mut print_path =
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move |fmt: &mut fmt::Formatter<'_>, path: crate::BytesOrWideString<'_>| {
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let path = path.into_path_buf();
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if !full {
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if let Ok(cwd) = &cwd {
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if let Ok(suffix) = path.strip_prefix(cwd) {
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return fmt::Display::fmt(&suffix.display(), fmt);
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}
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}
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}
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fmt::Display::fmt(&path.display(), fmt)
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};
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let mut f = BacktraceFmt::new(fmt, style, &mut print_path);
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f.add_context()?;
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for frame in frames {
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f.frame().backtrace_frame(frame)?;
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}
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f.finish()?;
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Ok(())
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}
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}
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impl Default for Backtrace {
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fn default() -> Backtrace {
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Backtrace::new()
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}
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}
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impl fmt::Debug for BacktraceFrame {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt.debug_struct("BacktraceFrame")
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.field("ip", &self.ip())
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.field("symbol_address", &self.symbol_address())
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.finish()
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}
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}
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impl fmt::Debug for BacktraceSymbol {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt.debug_struct("BacktraceSymbol")
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.field("name", &self.name())
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.field("addr", &self.addr())
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.field("filename", &self.filename())
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.field("lineno", &self.lineno())
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.field("colno", &self.colno())
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.finish()
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}
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}
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#[cfg(feature = "serialize-rustc")]
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mod rustc_serialize_impls {
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use super::*;
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use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
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#[derive(RustcEncodable, RustcDecodable)]
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struct SerializedFrame {
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ip: usize,
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symbol_address: usize,
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module_base_address: Option<usize>,
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symbols: Option<Vec<BacktraceSymbol>>,
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}
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impl Decodable for BacktraceFrame {
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fn decode<D>(d: &mut D) -> Result<Self, D::Error>
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where
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D: Decoder,
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{
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let frame: SerializedFrame = SerializedFrame::decode(d)?;
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Ok(BacktraceFrame {
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frame: Frame::Deserialized {
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ip: frame.ip,
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symbol_address: frame.symbol_address,
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module_base_address: frame.module_base_address,
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},
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symbols: frame.symbols,
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})
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}
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}
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impl Encodable for BacktraceFrame {
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fn encode<E>(&self, e: &mut E) -> Result<(), E::Error>
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where
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E: Encoder,
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{
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let BacktraceFrame { frame, symbols } = self;
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SerializedFrame {
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ip: frame.ip() as usize,
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symbol_address: frame.symbol_address() as usize,
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module_base_address: frame.module_base_address().map(|addr| addr as usize),
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symbols: symbols.clone(),
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}
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.encode(e)
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}
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}
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}
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#[cfg(feature = "serde")]
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mod serde_impls {
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use super::*;
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use serde::de::Deserializer;
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use serde::ser::Serializer;
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use serde::{Deserialize, Serialize};
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#[derive(Serialize, Deserialize)]
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struct SerializedFrame {
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ip: usize,
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symbol_address: usize,
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module_base_address: Option<usize>,
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symbols: Option<Vec<BacktraceSymbol>>,
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}
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impl Serialize for BacktraceFrame {
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fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let BacktraceFrame { frame, symbols } = self;
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SerializedFrame {
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ip: frame.ip() as usize,
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symbol_address: frame.symbol_address() as usize,
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module_base_address: frame.module_base_address().map(|addr| addr as usize),
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symbols: symbols.clone(),
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}
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.serialize(s)
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}
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}
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impl<'a> Deserialize<'a> for BacktraceFrame {
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fn deserialize<D>(d: D) -> Result<Self, D::Error>
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where
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D: Deserializer<'a>,
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{
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let frame: SerializedFrame = SerializedFrame::deserialize(d)?;
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Ok(BacktraceFrame {
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frame: Frame::Deserialized {
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ip: frame.ip,
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symbol_address: frame.symbol_address,
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module_base_address: frame.module_base_address,
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},
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symbols: frame.symbols,
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})
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_frame_conversion() {
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let mut frames = vec![];
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crate::trace(|frame| {
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let converted = BacktraceFrame::from(frame.clone());
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frames.push(converted);
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true
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});
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let mut manual = Backtrace::from(frames);
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manual.resolve();
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let frames = manual.frames();
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for frame in frames {
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println!("{:?}", frame.ip());
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println!("{:?}", frame.symbol_address());
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println!("{:?}", frame.module_base_address());
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println!("{:?}", frame.symbols());
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}
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}
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}
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