2 // We disable tail merging here because it can't preserve debuginfo and thus
3 // potentially breaks the backtraces. Also, subtle changes can decide whether
4 // tail merging succeeds, so the test might work today but fail tomorrow due to a
5 // seemingly completely unrelated change.
6 // Unfortunately, LLVM has no "disable" option for this, so we have to set
7 // "enable" to 0 instead.
9 // compile-flags:-g -Cllvm-args=-enable-tail-merge=0 -Cllvm-args=-opt-bisect-limit=0
10 // compile-flags:-Cforce-frame-pointers=yes
11 // ignore-pretty issue #37195
12 // ignore-emscripten spawning processes is not supported
13 // ignore-sgx no processes
14 // normalize-stderr-test ".*\n" -> ""
16 // Note that above `-opt-bisect-limit=0` is used to basically disable
17 // optimizations. It creates tons of output on stderr, hence we normalize
18 // that away entirely.
22 #[path = "backtrace-debuginfo-aux.rs"] mod aux;
25 () => ((file!(), line!()))
28 macro_rules! dump_and_die {
29 ($($pos:expr),*) => ({
30 // FIXME(#18285): we cannot include the current position because
31 // the macro span takes over the last frame's file/line.
33 // You might also be wondering why a major platform,
34 // i686-pc-windows-msvc, is located in here. Some of the saga can be
35 // found on #62897, but the tl;dr; is that it appears that if the
36 // standard library doesn't have debug information or frame pointers,
37 // which it doesn't by default on the test builders, then the stack
38 // walking routines in dbghelp will randomly terminate the stack trace
39 // in libstd without going further. Presumably the addition of frame
40 // pointers and/or debuginfo fixes this since tests always work with
41 // nightly compilers (which have debuginfo). In general though this test
42 // is replicated in rust-lang/backtrace-rs and has extensive coverage
43 // there, even on i686-pc-windows-msvc. We do the best we can in
44 // rust-lang/rust to test it as well, but sometimes we just gotta keep
46 if cfg!(any(target_os = "android",
47 all(target_os = "linux", target_arch = "arm"),
48 all(target_env = "msvc", target_arch = "x86"),
49 target_os = "freebsd",
50 target_os = "dragonfly",
51 target_os = "openbsd")) {
52 // skip these platforms as this support isn't implemented yet.
54 dump_filelines(&[$($pos),*]);
60 // we can't use a function as it will alter the backtrace
62 ($counter:expr; $($pos:expr),*) => ({
64 dump_and_die!($($pos),*)
71 type Pos = (&'static str, u32);
73 // this goes to stdout and each line has to be occurred
74 // in the following backtrace to stderr with a correct order.
75 fn dump_filelines(filelines: &[Pos]) {
76 for &(file, line) in filelines.iter().rev() {
78 let basename = file.split(&['/', '\\'][..]).last().unwrap();
79 println!("{}:{}", basename, line);
84 fn inner(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
85 check!(counter; main_pos, outer_pos);
86 check!(counter; main_pos, outer_pos);
87 let inner_pos = pos!(); aux::callback(|aux_pos| {
88 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
90 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
91 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
95 // We emit the wrong location for the caller here when inlined on MSVC
96 #[cfg_attr(not(target_env = "msvc"), inline(always))]
97 #[cfg_attr(target_env = "msvc", inline(never))]
98 fn inner_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos) {
99 check!(counter; main_pos, outer_pos);
100 check!(counter; main_pos, outer_pos);
102 // Again, disable inlining for MSVC.
103 #[cfg_attr(not(target_env = "msvc"), inline(always))]
104 #[cfg_attr(target_env = "msvc", inline(never))]
105 fn inner_further_inlined(counter: &mut i32, main_pos: Pos, outer_pos: Pos, inner_pos: Pos) {
106 check!(counter; main_pos, outer_pos, inner_pos);
108 inner_further_inlined(counter, main_pos, outer_pos, pos!());
110 let inner_pos = pos!(); aux::callback(|aux_pos| {
111 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
113 let inner_pos = pos!(); aux::callback_inlined(|aux_pos| {
114 check!(counter; main_pos, outer_pos, inner_pos, aux_pos);
117 // this tests a distinction between two independent calls to the inlined function.
118 // (un)fortunately, LLVM somehow merges two consecutive such calls into one node.
119 inner_further_inlined(counter, main_pos, outer_pos, pos!());
123 fn outer(mut counter: i32, main_pos: Pos) {
124 inner(&mut counter, main_pos, pos!());
125 inner_inlined(&mut counter, main_pos, pos!());
128 fn check_trace(output: &str, error: &str) -> Result<(), String> {
129 // reverse the position list so we can start with the last item (which was the first line)
130 let mut remaining: Vec<&str> = output.lines().map(|s| s.trim()).rev().collect();
132 if !error.contains("stack backtrace") {
133 return Err(format!("no backtrace found in stderr:\n{}", error))
135 for line in error.lines() {
136 if !remaining.is_empty() && line.contains(remaining.last().unwrap()) {
140 if !remaining.is_empty() {
141 return Err(format!("trace does not match position list\n\
142 still need to find {:?}\n\n\
145 remaining, output, error))
150 fn run_test(me: &str) {
152 use std::process::Command;
155 let mut errors = Vec::new();
157 let out = Command::new(me)
158 .env("RUST_BACKTRACE", "full")
159 .arg(i.to_string()).output().unwrap();
160 let output = str::from_utf8(&out.stdout).unwrap();
161 let error = str::from_utf8(&out.stderr).unwrap();
162 if out.status.success() {
163 assert!(output.contains("done."), "bad output for successful run: {}", output);
166 if let Err(e) = check_trace(output, error) {
172 if errors.len() > 0 {
173 for error in errors {
174 println!("---------------------------------------");
175 println!("{}", error);
178 panic!("found some errors");
184 let args: Vec<String> = env::args().collect();
186 let case = args[1].parse().unwrap();
187 eprintln!("test case {}", case);