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 // We disable tail merging here because it can't preserve debuginfo and thus
12 // potentially breaks the backtraces. Also, subtle changes can decide whether
13 // tail merging suceeds, so the test might work today but fail tomorrow due to a
14 // seemingly completely unrelated change.
15 // Unfortunately, LLVM has no "disable" option for this, so we have to set
16 // "enable" to 0 instead.
18 // compile-flags:-g -Cllvm-args=-enable-tail-merge=0
19 // ignore-pretty as this critically relies on line numbers
22 use std::io::prelude::*;
25 #[path = "backtrace-debuginfo-aux.rs"] mod aux;
28 () => ((file!(), line!()))
31 macro_rules! dump_and_die {
32 ($($pos:expr),*) => ({
33 // FIXME(#18285): we cannot include the current position because
34 // the macro span takes over the last frame's file/line.
35 if cfg!(target_os = "macos") ||
36 cfg!(target_os = "ios") ||
37 cfg!(target_os = "android") ||
38 cfg!(all(target_os = "linux", target_arch = "arm")) ||
39 cfg!(all(windows, target_env = "gnu")) {
40 // skip these platforms as this support isn't implemented yet.
42 dump_filelines(&[$($pos),*]);
48 // we can't use a function as it will alter the backtrace
50 ($counter:expr; $($pos:expr),*) => ({
52 dump_and_die!($($pos),*)
59 type Pos = (&'static str, u32);
61 // this goes to stdout and each line has to be occurred
62 // in the following backtrace to stderr with a correct order.
63 fn dump_filelines(filelines: &[Pos]) {
64 // Skip top frame for MSVC, because it sees the macro rather than
65 // the containing function.
66 let skip = if cfg!(target_env = "msvc") {1} else {0};
67 for &(file, line) in filelines.iter().rev().skip(skip) {
69 let basename = file.split(&['/', '\\'][..]).last().unwrap();
70 println!("{}:{}", basename, line);
75 fn inner(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
76 check!(counter; main_pos, outer_pos);
77 check!(counter; main_pos, outer_pos);
78 let inner_pos = pos!(); aux::callback(|aux_pos| {
79 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
81 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
82 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
86 // LLVM does not yet output the required debug info to support showing inlined
87 // function calls in backtraces when targetting MSVC, so disable inlining in
89 #[cfg_attr(not(target_env = "msvc"), inline(always))]
90 #[cfg_attr(target_env = "msvc", inline(never))]
91 fn inner_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
92 check!(counter; main_pos, outer_pos);
93 check!(counter; main_pos, outer_pos);
95 // Again, disable inlining for MSVC.
96 #[cfg_attr(not(target_env = "msvc"), inline(always))]
97 #[cfg_attr(target_env = "msvc", inline(never))]
98 fn inner_further_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos, inner_pos: Pos) {
99 check!(counter; main_pos, outer_pos, inner_pos);
101 inner_further_inlined(counter, main_pos, outer_pos, pos!());
103 let inner_pos = pos!(); aux::callback(|aux_pos| {
104 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
106 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
107 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
110 // this tests a distinction between two independent calls to the inlined function.
111 // (un)fortunately, LLVM somehow merges two consecutive such calls into one node.
112 inner_further_inlined(counter, main_pos, outer_pos, pos!());
116 fn outer(mut counter: i32, main_pos: Pos) {
117 inner(&mut counter, main_pos, pos!());
118 inner_inlined(&mut counter, main_pos, pos!());
121 fn check_trace(output: &str, error: &str) {
122 // reverse the position list so we can start with the last item (which was the first line)
123 let mut remaining: Vec<&str> = output.lines().map(|s| s.trim()).rev().collect();
125 assert!(error.contains("stack backtrace"), "no backtrace in the error: {}", error);
126 for line in error.lines() {
127 if !remaining.is_empty() && line.contains(remaining.last().unwrap()) {
131 assert!(remaining.is_empty(),
132 "trace does not match position list: {}\n---\n{}", error, output);
135 fn run_test(me: &str) {
137 use std::process::Command;
139 let mut template = Command::new(me);
140 template.env("RUST_BACKTRACE", "1");
144 let out = Command::new(me)
145 .env("RUST_BACKTRACE", "1")
146 .arg(i.to_string()).output().unwrap();
147 let output = str::from_utf8(&out.stdout).unwrap();
148 let error = str::from_utf8(&out.stderr).unwrap();
149 if out.status.success() {
150 assert!(output.contains("done."), "bad output for successful run: {}", output);
153 check_trace(output, error);
161 let args: Vec<String> = env::args().collect();
163 let case = args[1].parse().unwrap();
164 writeln!(&mut io::stderr(), "test case {}", case).unwrap();