mirror of
https://github.com/mozilla/gecko-dev.git
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servo: Merge #10824 - Communicate a backtrace to the constellation when panicking (from asajeffrey:communicate-backtrace-on-panic); r=Manishearth
Send a representation of the backtrace from a pipeline thread to the constellation in the case of panic. This is the next step in communicating the backtrace to the browser chrome (#10334). Source-Repo: https://github.com/servo/servo Source-Revision: f773dc182badef4a4afac240d0d6fcbf57b76452
This commit is contained in:
parent
2f28c7365d
commit
edc1efc288
@ -54,7 +54,6 @@ use std::borrow::ToOwned;
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use std::collections::HashMap;
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use std::env;
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use std::io::Error as IOError;
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use std::io::{self, Write};
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use std::marker::PhantomData;
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use std::mem::replace;
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use std::process;
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@ -183,6 +182,9 @@ pub struct Constellation<LTF, STF> {
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// Webrender interface, if enabled.
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webrender_api_sender: Option<webrender_traits::RenderApiSender>,
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/// Have we seen any panics? Hopefully always false!
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handled_panic: bool,
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/// The random number generator and probability for closing pipelines.
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/// This is for testing the hardening of the constellation.
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random_pipeline_closure: Option<(StdRng, f32)>,
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@ -369,6 +371,7 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
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child_processes: Vec::new(),
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document_states: HashMap::new(),
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webrender_api_sender: state.webrender_api_sender,
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handled_panic: false,
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random_pipeline_closure: opts::get().random_pipeline_closure_probability.map(|prob| {
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let seed = opts::get().random_pipeline_closure_seed.unwrap_or_else(random);
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let rng = StdRng::from_seed(&[seed]);
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@ -810,9 +813,9 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
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// Panic messages
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Request::Panic((pipeline_id, panic_reason)) => {
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Request::Panic((pipeline_id, panic_reason, backtrace)) => {
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debug!("handling panic message ({:?})", pipeline_id);
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self.handle_panic(pipeline_id, panic_reason);
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self.handle_panic(pipeline_id, panic_reason, backtrace);
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}
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}
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true
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@ -842,55 +845,58 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
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fn handle_send_error(&mut self, pipeline_id: PipelineId, err: IOError) {
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// Treat send error the same as receiving a panic message
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debug!("Pipeline {:?} send error ({}).", pipeline_id, err);
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self.handle_panic(Some(pipeline_id), format!("Send failed ({})", err));
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self.handle_panic(Some(pipeline_id), format!("Send failed ({})", err), String::from("<none>"));
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}
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fn handle_panic(&mut self, pipeline_id: Option<PipelineId>, reason: String) {
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fn handle_panic(&mut self, pipeline_id: Option<PipelineId>, reason: String, backtrace: String) {
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error!("Panic: {}", reason);
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if !self.handled_panic || opts::get().full_backtraces {
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// For the first panic, we print the full backtrace
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error!("Backtrace:\n{}", backtrace);
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} else {
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error!("Backtrace skipped (run with -Z full-backtraces to see every backtrace).");
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}
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if opts::get().hard_fail {
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// It's quite difficult to make Servo exit cleanly if some threads have failed.
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// Hard fail exists for test runners so we crash and that's good enough.
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let mut stderr = io::stderr();
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stderr.write_all("Pipeline failed in hard-fail mode. Crashing!\n".as_bytes())
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.expect("Failed to write to stderr!");
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error!("Pipeline failed in hard-fail mode. Crashing!");
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process::exit(1);
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}
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debug!("Panic handler for pipeline {:?}: {}.", pipeline_id, reason);
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if let Some(pipeline_id) = pipeline_id {
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self.replace_pipeline_with_about_failure(pipeline_id);
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let parent_info = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.parent_info);
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let window_size = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.size);
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// Notify the browser chrome that the pipeline has failed
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self.trigger_mozbrowsererror(pipeline_id);
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self.close_pipeline(pipeline_id, ExitPipelineMode::Force);
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while let Some(pending_pipeline_id) = self.pending_frames.iter().find(|pending| {
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pending.old_pipeline_id == Some(pipeline_id)
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}).map(|frame| frame.new_pipeline_id) {
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warn!("removing pending frame change for failed pipeline");
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self.close_pipeline(pending_pipeline_id, ExitPipelineMode::Force);
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}
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warn!("creating replacement pipeline for about:failure");
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let new_pipeline_id = PipelineId::new();
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self.new_pipeline(new_pipeline_id,
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parent_info,
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window_size,
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None,
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LoadData::new(Url::parse("about:failure").expect("infallible"), None, None));
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self.push_pending_frame(new_pipeline_id, Some(pipeline_id));
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}
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}
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fn replace_pipeline_with_about_failure(&mut self, pipeline_id: PipelineId) {
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let parent_info = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.parent_info);
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let window_size = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.size);
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// Notify the browser chrome that the pipeline has failed
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self.trigger_mozbrowsererror(pipeline_id);
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self.close_pipeline(pipeline_id, ExitPipelineMode::Force);
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while let Some(pending_pipeline_id) = self.pending_frames.iter().find(|pending| {
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pending.old_pipeline_id == Some(pipeline_id)
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}).map(|frame| frame.new_pipeline_id) {
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warn!("removing pending frame change for failed pipeline");
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self.close_pipeline(pending_pipeline_id, ExitPipelineMode::Force);
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}
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warn!("creating replacement pipeline for about:failure");
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let new_pipeline_id = PipelineId::new();
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self.new_pipeline(new_pipeline_id,
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parent_info,
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window_size,
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None,
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LoadData::new(Url::parse("about:failure").expect("infallible"), None, None));
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self.push_pending_frame(new_pipeline_id, Some(pipeline_id));
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self.handled_panic = true;
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}
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fn handle_init_load(&mut self, url: Url) {
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@ -35,7 +35,7 @@ impl<T: Serialize + Deserialize> Clone for ConstellationChan<T> {
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}
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}
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pub type PanicMsg = (Option<PipelineId>, String);
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pub type PanicMsg = (Option<PipelineId>, String, String);
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#[derive(Copy, Clone, Deserialize, Serialize, HeapSizeOf)]
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pub struct WindowSizeData {
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31
servo/components/servo/Cargo.lock
generated
31
servo/components/servo/Cargo.lock
generated
@ -116,6 +116,27 @@ dependencies = [
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"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "backtrace"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "backtrace-sys"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "bincode"
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version = "0.5.3"
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@ -380,6 +401,15 @@ dependencies = [
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"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "dbghelp-sys"
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version = "0.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "debug_unreachable"
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version = "0.0.6"
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@ -2253,6 +2283,7 @@ name = "util"
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version = "0.0.1"
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dependencies = [
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"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -29,6 +29,7 @@ git = "https://github.com/servo/ipc-channel"
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[dependencies]
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app_units = {version = "0.2.3", features = ["plugins"]}
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backtrace = "0.2.1"
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bitflags = "0.3"
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deque = "0.3.1"
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euclid = {version = "0.6.4", features = ["unstable", "plugins"]}
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@ -18,6 +18,7 @@
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#![deny(unsafe_code)]
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extern crate app_units;
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extern crate backtrace;
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#[allow(unused_extern_crates)]
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#[macro_use]
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extern crate bitflags;
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@ -2,11 +2,9 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use opts;
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use std::any::Any;
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use std::boxed::FnBox;
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use std::cell::RefCell;
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use std::io::{Write, stderr};
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use std::panic::{PanicInfo, take_hook, set_hook};
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use std::sync::{Once, ONCE_INIT};
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use std::thread;
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@ -31,9 +29,6 @@ pub fn set_thread_local_hook(local: Box<FnBox(&Any)>) {
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/// Should be called in main() after arguments have been parsed
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pub fn initiate_panic_hook() {
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// store it locally, we can't trust that opts::get() will work whilst panicking
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let full_backtraces = opts::get().full_backtraces;
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// Set the panic handler only once. It is global.
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HOOK_SET.call_once(|| {
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// The original backtrace-printing hook. We still want to call this
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@ -44,34 +39,15 @@ pub fn initiate_panic_hook() {
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let name = thread::current().name().unwrap_or("<unknown thread>").to_string();
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// Notify error handlers stored in LOCAL_INFO if any
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LOCAL_INFO.with(|i| {
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if let Some(info) = i.borrow_mut().take() {
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if let Some(local_info) = i.borrow_mut().take() {
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debug!("Thread `{}` failed, notifying error handlers", name);
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(info.fail).call_box((payload, ));
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(local_info.fail).call_box((payload, ));
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} else {
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hook(&info);
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}
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});
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// Skip cascading SendError/RecvError backtraces if allowed
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if !full_backtraces {
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if let Some(s) = payload.downcast_ref::<String>() {
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if s.contains("SendError") {
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let err = stderr();
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let _ = write!(err.lock(), "Thread \"{}\" panicked with an unwrap of \
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`SendError` (backtrace skipped)\n", name);
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return;
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} else if s.contains("RecvError") {
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let err = stderr();
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let _ = write!(err.lock(), "Thread \"{}\" panicked with an unwrap of \
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`RecvError` (backtrace skipped)\n", name);
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return;
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}
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}
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}
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// Call the old hook to get the backtrace
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hook(&info);
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};
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set_hook(Box::new(new_hook));
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});
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}
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@ -2,6 +2,7 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use backtrace::Backtrace;
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use ipc_channel::ipc::IpcSender;
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use panicking;
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use serde::Serialize;
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@ -20,7 +21,7 @@ pub fn spawn_named_with_send_on_panic<F, Id>(name: String,
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state: thread_state::ThreadState,
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f: F,
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id: Id,
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panic_chan: IpcSender<(Id, String)>)
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panic_chan: IpcSender<(Id, String, String)>)
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where F: FnOnce() + Send + 'static,
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Id: Copy + Send + Serialize + 'static,
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{
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@ -31,7 +32,20 @@ pub fn spawn_named_with_send_on_panic<F, Id>(name: String,
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let reason = payload.downcast_ref::<String>().map(|s| String::from(&**s))
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.or(payload.downcast_ref::<&'static str>().map(|s| String::from(*s)))
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.unwrap_or_else(|| String::from("<unknown reason>"));
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let _ = panic_chan.send((id, reason));
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// FIXME(ajeffrey): Really we should send the backtrace itself,
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// not just a string representation. Unfortunately we can't, because
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// Servo won't compile backtrace with the serialize-serde feature:
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//
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// .../quasi_macros-0.9.0/src/lib.rs:19:29: 19:32 error: mismatched types:
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// expected `&mut syntex::Registry`,
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// found `&mut rustc_plugin::Registry<'_>`
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// (expected struct `syntex::Registry`,
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// found struct `rustc_plugin::Registry`) [E0308]
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// .../quasi_macros-0.9.0/src/lib.rs:19 quasi_codegen::register(reg);
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//
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// so for the moment we just send a debug string.
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let backtrace = format!("{:?}", Backtrace::new());
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let _ = panic_chan.send((id, reason, backtrace));
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}));
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f()
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}).expect("Thread spawn failed");
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31
servo/ports/cef/Cargo.lock
generated
31
servo/ports/cef/Cargo.lock
generated
@ -101,6 +101,27 @@ dependencies = [
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"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "backtrace"
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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|
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[[package]]
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name = "backtrace-sys"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
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"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
|
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]
|
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|
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[[package]]
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name = "bincode"
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version = "0.5.3"
|
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@ -350,6 +371,15 @@ dependencies = [
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"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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|
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[[package]]
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name = "dbghelp-sys"
|
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version = "0.2.0"
|
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source = "registry+https://github.com/rust-lang/crates.io-index"
|
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dependencies = [
|
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"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
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]
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|
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[[package]]
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name = "debug_unreachable"
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version = "0.0.6"
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@ -2130,6 +2160,7 @@ name = "util"
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version = "0.0.1"
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dependencies = [
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"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
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|
36
servo/ports/geckolib/Cargo.lock
generated
36
servo/ports/geckolib/Cargo.lock
generated
@ -39,6 +39,27 @@ name = "aster"
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version = "0.15.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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|
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[[package]]
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name = "backtrace"
|
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version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
|
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"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
|
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"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
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]
|
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|
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[[package]]
|
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name = "backtrace-sys"
|
||||
version = "0.1.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "bincode"
|
||||
version = "0.5.3"
|
||||
@ -65,6 +86,11 @@ name = "byteorder"
|
||||
version = "0.5.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
|
||||
[[package]]
|
||||
name = "cfg-if"
|
||||
version = "0.1.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
|
||||
[[package]]
|
||||
name = "cssparser"
|
||||
version = "0.5.5"
|
||||
@ -78,6 +104,15 @@ dependencies = [
|
||||
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "dbghelp-sys"
|
||||
version = "0.2.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "debug_unreachable"
|
||||
version = "0.0.6"
|
||||
@ -545,6 +580,7 @@ name = "util"
|
||||
version = "0.0.1"
|
||||
dependencies = [
|
||||
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
|
31
servo/ports/gonk/Cargo.lock
generated
31
servo/ports/gonk/Cargo.lock
generated
@ -94,6 +94,27 @@ dependencies = [
|
||||
"x11 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "backtrace"
|
||||
version = "0.2.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"backtrace-sys 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"kernel32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "backtrace-sys"
|
||||
version = "0.1.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"libc 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "bincode"
|
||||
version = "0.5.3"
|
||||
@ -343,6 +364,15 @@ dependencies = [
|
||||
"serde_macros 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "dbghelp-sys"
|
||||
version = "0.2.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"winapi 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "debug_unreachable"
|
||||
version = "0.0.6"
|
||||
@ -2111,6 +2141,7 @@ name = "util"
|
||||
version = "0.0.1"
|
||||
dependencies = [
|
||||
"app_units 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"backtrace 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"bitflags 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"deque 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
"euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
|
Loading…
Reference in New Issue
Block a user