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.
17 // compile-flags:-g -Cllvm-args=-enable-tail-merge=0
18 // ignore-pretty as this critically relies on line numbers
21 use std::io::prelude::*;
24 #[path = "backtrace-debuginfo-aux.rs"] mod aux;
27 () => ((file!(), line!()))
31 not(target_os = "macos"),
32 not(target_os = "ios"),
33 not(target_os = "android"),
34 not(all(target_os = "linux", target_arch = "arm"))))]
35 macro_rules! dump_and_die {
36 ($($pos:expr),*) => ({
37 // FIXME(#18285): we cannot include the current position because
38 // the macro span takes over the last frame's file/line.
39 dump_filelines(&[$($pos),*]);
44 // this does not work on Windows, Android, OSX or iOS
46 not(target_os = "macos"),
47 not(target_os = "ios"),
48 not(target_os = "android"),
49 not(all(target_os = "linux", target_arch = "arm")))))]
50 macro_rules! dump_and_die {
51 ($($pos:expr),*) => ({ let _ = [$($pos),*]; })
54 // we can't use a function as it will alter the backtrace
56 ($counter:expr; $($pos:expr),*) => ({
58 dump_and_die!($($pos),*)
65 type Pos = (&'static str, u32);
67 // this goes to stdout and each line has to be occurred
68 // in the following backtrace to stderr with a correct order.
69 fn dump_filelines(filelines: &[Pos]) {
70 // Skip top frame for MSVC, because it sees the macro rather than
71 // the containing function.
72 let skip = if cfg!(target_env = "msvc") {1} else {0};
73 for &(file, line) in filelines.iter().rev().skip(skip) {
75 let basename = file.split(&['/', '\\'][..]).last().unwrap();
76 println!("{}:{}", basename, line);
81 fn inner(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
82 check!(counter; main_pos, outer_pos);
83 check!(counter; main_pos, outer_pos);
84 let inner_pos = pos!(); aux::callback(|aux_pos| {
85 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
87 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
88 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
92 // LLVM does not yet output the required debug info to support showing inlined
93 // function calls in backtraces when targetting MSVC, so disable inlining in
95 #[cfg_attr(not(target_env = "msvc"), inline(always))]
96 #[cfg_attr(target_env = "msvc", inline(never))]
97 fn inner_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
98 check!(counter; main_pos, outer_pos);
99 check!(counter; main_pos, outer_pos);
101 // Again, disable inlining for MSVC.
102 #[cfg_attr(not(target_env = "msvc"), inline(always))]
103 #[cfg_attr(target_env = "msvc", inline(never))]
104 fn inner_further_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos, inner_pos: Pos) {
105 check!(counter; main_pos, outer_pos, inner_pos);
107 inner_further_inlined(counter, main_pos, outer_pos, pos!());
109 let inner_pos = pos!(); aux::callback(|aux_pos| {
110 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
112 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
113 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
116 // this tests a distinction between two independent calls to the inlined function.
117 // (un)fortunately, LLVM somehow merges two consecutive such calls into one node.
118 inner_further_inlined(counter, main_pos, outer_pos, pos!());
122 fn outer(mut counter: i32, main_pos: Pos) {
123 inner(&mut counter, main_pos, pos!());
124 inner_inlined(&mut counter, main_pos, pos!());
127 fn check_trace(output: &str, error: &str) {
128 // reverse the position list so we can start with the last item (which was the first line)
129 let mut remaining: Vec<&str> = output.lines().map(|s| s.trim()).rev().collect();
131 assert!(error.contains("stack backtrace"), "no backtrace in the error: {}", error);
132 for line in error.lines() {
133 if !remaining.is_empty() && line.contains(remaining.last().unwrap()) {
137 assert!(remaining.is_empty(),
138 "trace does not match position list: {}\n---\n{}", error, output);
141 fn run_test(me: &str) {
143 use std::process::Command;
145 let mut template = Command::new(me);
146 template.env("RUST_BACKTRACE", "1");
150 let out = Command::new(me)
151 .env("RUST_BACKTRACE", "1")
152 .arg(i.to_string()).output().unwrap();
153 let output = str::from_utf8(&out.stdout).unwrap();
154 let error = str::from_utf8(&out.stderr).unwrap();
155 if out.status.success() {
156 assert!(output.contains("done."), "bad output for successful run: {}", output);
159 check_trace(output, error);
167 let args: Vec<String> = env::args().collect();
169 let case = args[1].parse().unwrap();
170 writeln!(&mut io::stderr(), "test case {}", case).unwrap();