From a2c82a03ba613a32d6ad8e31111178083ab7da7b Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Sat, 2 Apr 2016 05:56:41 +0530
Subject: [PATCH] Add option for printing full backtraces

---
 components/util/opts.rs   | 10 ++++++++++
 components/util/thread.rs |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/components/util/opts.rs b/components/util/opts.rs
index e8d5283b9b4..c2b2faefbcd 100644
--- a/components/util/opts.rs
+++ b/components/util/opts.rs
@@ -201,6 +201,9 @@ pub struct Opts {
 
     // Which rendering API to use.
     pub render_api: RenderApi,
+
+    // don't skip any backtraces on panic
+    pub full_backtraces: bool,
 }
 
 fn print_usage(app: &str, opts: &Options) {
@@ -291,6 +294,9 @@ pub struct DebugOptions {
     /// Use multisample antialiasing in WebRender.
     pub use_msaa: bool,
 
+    // don't skip any backtraces on panic
+    pub full_backtraces: bool,
+
 }
 
 
@@ -326,6 +332,7 @@ impl DebugOptions {
                 "disable-vsync" => debug_options.disable_vsync = true,
                 "wr-stats" => debug_options.webrender_stats = true,
                 "msaa" => debug_options.use_msaa = true,
+                "full-backtraces" => debug_options.full_backtraces = true,
                 "" => {},
                 _ => return Err(option)
             };
@@ -373,6 +380,7 @@ pub fn print_debug_usage(app: &str) -> ! {
                  "Disable vsync mode in the compositor to allow profiling at more than monitor refresh rate");
     print_option("wr-stats", "Show WebRender profiler on screen.");
     print_option("msaa", "Use multisample antialiasing in WebRender.");
+    print_option("full-backtraces", "Print full backtraces for all errors");
 
     println!("");
 
@@ -515,6 +523,7 @@ pub fn default_opts() -> Opts {
         use_msaa: false,
         render_api: DEFAULT_RENDER_API,
         profile_dir: None,
+        full_backtraces: false,
     }
 }
 
@@ -795,6 +804,7 @@ pub fn from_cmdline_args(args: &[String]) -> ArgumentParsingResult {
         webrender_stats: debug_options.webrender_stats,
         use_msaa: debug_options.use_msaa,
         profile_dir: opt_match.opt_str("profile-dir"),
+        full_backtraces: debug_options.full_backtraces,
     };
 
     set_defaults(opts);
diff --git a/components/util/thread.rs b/components/util/thread.rs
index 9175996a4b2..f32e6ccd4f7 100644
--- a/components/util/thread.rs
+++ b/components/util/thread.rs
@@ -3,6 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use ipc_channel::ipc::IpcSender;
+use opts;
 use serde::Serialize;
 use std::borrow::ToOwned;
 use std::io::{Write, stderr};
@@ -17,6 +18,11 @@ pub fn spawn_named<F>(name: String, f: F)
 {
     let builder = thread::Builder::new().name(name);
 
+    if opts::get().full_backtraces {
+        builder.spawn(f).unwrap();
+        return;
+    }
+
     let f_with_handler = move || {
         let hook = take_handler();