Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/backtrace/benches/benchmarks.rs

@@ -0,0 +1,92 @@
+#![feature(test)]
+
+extern crate test;
+
+#[cfg(feature = "std")]
+use backtrace::Backtrace;
+
+#[bench]
+#[cfg(feature = "std")]
+fn trace(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function() {
+        backtrace::trace(|frame| {
+            let ip = frame.ip();
+            test::black_box(ip);
+            true
+        });
+    }
+    b.iter(the_function);
+}
+
+#[bench]
+#[cfg(feature = "std")]
+fn trace_and_resolve_callback(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function() {
+        backtrace::trace(|frame| {
+            backtrace::resolve(frame.ip(), |symbol| {
+                let addr = symbol.addr();
+                test::black_box(addr);
+            });
+            true
+        });
+    }
+    b.iter(the_function);
+}
+
+#[bench]
+#[cfg(feature = "std")]
+fn trace_and_resolve_separate(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function(frames: &mut Vec<*mut std::ffi::c_void>) {
+        backtrace::trace(|frame| {
+            frames.push(frame.ip());
+            true
+        });
+        frames.iter().for_each(|frame_ip| {
+            backtrace::resolve(*frame_ip, |symbol| {
+                test::black_box(symbol);
+            });
+        });
+    }
+    let mut frames = Vec::with_capacity(1024);
+    b.iter(|| {
+        the_function(&mut frames);
+        frames.clear();
+    });
+}
+
+#[bench]
+#[cfg(feature = "std")]
+fn new_unresolved(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function() {
+        let bt = Backtrace::new_unresolved();
+        test::black_box(bt);
+    }
+    b.iter(the_function);
+}
+
+#[bench]
+#[cfg(feature = "std")]
+fn new(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function() {
+        let bt = Backtrace::new();
+        test::black_box(bt);
+    }
+    b.iter(the_function);
+}
+
+#[bench]
+#[cfg(feature = "std")]
+fn new_unresolved_and_resolve_separate(b: &mut test::Bencher) {
+    #[inline(never)]
+    fn the_function() {
+        let mut bt = Backtrace::new_unresolved();
+        bt.resolve();
+        test::black_box(bt);
+    }
+    b.iter(the_function);
+}