1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![feature(rustc_attrs)]
13 // We disable tail merging here because it can't preserve debuginfo and thus
14 // potentially breaks the backtraces. Also, subtle changes can decide whether
15 // tail merging suceeds, so the test might work today but fail tomorrow due to a
16 // seemingly completely unrelated change.
17 // Unfortunately, LLVM has no "disable" option for this, so we have to set
18 // "enable" to 0 instead.
20 // compile-flags:-g -Cllvm-args=-enable-tail-merge=0
21 // ignore-pretty as this critically relies on line numbers
24 use std::io::prelude::*;
27 #[path = "backtrace-debuginfo-aux.rs"] mod aux;
30 () => ((file!(), line!()))
33 macro_rules! dump_and_die {
34 ($($pos:expr),*) => ({
35 // FIXME(#18285): we cannot include the current position because
36 // the macro span takes over the last frame's file/line.
37 if cfg!(target_os = "macos") ||
38 cfg!(target_os = "ios") ||
39 cfg!(target_os = "android") ||
40 cfg!(all(target_os = "linux", target_arch = "arm")) ||
41 cfg!(all(windows, target_env = "gnu")) {
42 // skip these platforms as this support isn't implemented yet.
44 dump_filelines(&[$($pos),*]);
50 // we can't use a function as it will alter the backtrace
52 ($counter:expr; $($pos:expr),*) => ({
54 dump_and_die!($($pos),*)
61 type Pos = (&'static str, u32);
63 // this goes to stdout and each line has to be occurred
64 // in the following backtrace to stderr with a correct order.
65 fn dump_filelines(filelines: &[Pos]) {
66 // Skip top frame for MSVC, because it sees the macro rather than
67 // the containing function.
68 let skip = if cfg!(target_env = "msvc") {1} else {0};
69 for &(file, line) in filelines.iter().rev().skip(skip) {
71 let basename = file.split(&['/', '\\'][..]).last().unwrap();
72 println!("{}:{}", basename, line);
77 #[rustc_no_mir] // FIXME #31005 MIR missing debuginfo currently.
78 fn inner(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
79 check!(counter; main_pos, outer_pos);
80 check!(counter; main_pos, outer_pos);
81 let inner_pos = pos!(); aux::callback(|aux_pos| {
82 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
84 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
85 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
89 // LLVM does not yet output the required debug info to support showing inlined
90 // function calls in backtraces when targetting MSVC, so disable inlining in
92 #[cfg_attr(not(target_env = "msvc"), inline(always))]
93 #[cfg_attr(target_env = "msvc", inline(never))]
94 #[rustc_no_mir] // FIXME #31005 MIR missing debuginfo currently.
95 fn inner_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
96 check!(counter; main_pos, outer_pos);
97 check!(counter; main_pos, outer_pos);
99 // Again, disable inlining for MSVC.
100 #[cfg_attr(not(target_env = "msvc"), inline(always))]
101 #[cfg_attr(target_env = "msvc", inline(never))]
102 fn inner_further_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos, inner_pos: Pos) {
103 check!(counter; main_pos, outer_pos, inner_pos);
105 inner_further_inlined(counter, main_pos, outer_pos, pos!());
107 let inner_pos = pos!(); aux::callback(|aux_pos| {
108 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
110 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
111 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
114 // this tests a distinction between two independent calls to the inlined function.
115 // (un)fortunately, LLVM somehow merges two consecutive such calls into one node.
116 inner_further_inlined(counter, main_pos, outer_pos, pos!());
120 #[rustc_no_mir] // FIXME #31005 MIR missing debuginfo currently.
121 fn outer(mut counter: i32, main_pos: Pos) {
122 inner(&mut counter, main_pos, pos!());
123 inner_inlined(&mut counter, main_pos, pos!());
126 fn check_trace(output: &str, error: &str) {
127 // reverse the position list so we can start with the last item (which was the first line)
128 let mut remaining: Vec<&str> = output.lines().map(|s| s.trim()).rev().collect();
130 assert!(error.contains("stack backtrace"), "no backtrace in the error: {}", error);
131 for line in error.lines() {
132 if !remaining.is_empty() && line.contains(remaining.last().unwrap()) {
136 assert!(remaining.is_empty(),
137 "trace does not match position list: {}\n---\n{}", error, output);
140 fn run_test(me: &str) {
142 use std::process::Command;
144 let mut template = Command::new(me);
145 template.env("RUST_BACKTRACE", "1");
149 let out = Command::new(me)
150 .env("RUST_BACKTRACE", "1")
151 .arg(i.to_string()).output().unwrap();
152 let output = str::from_utf8(&out.stdout).unwrap();
153 let error = str::from_utf8(&out.stderr).unwrap();
154 if out.status.success() {
155 assert!(output.contains("done."), "bad output for successful run: {}", output);
158 check_trace(output, error);
165 #[rustc_no_mir] // FIXME #31005 MIR missing debuginfo currently.
167 let args: Vec<String> = env::args().collect();
169 let case = args[1].parse().unwrap();
170 writeln!(&mut io::stderr(), "test case {}", case).unwrap();