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//@ run-pass
//@ ignore-android FIXME #17520
//@ ignore-wasm32 spawning processes is not supported
//@ ignore-openbsd no support for libbacktrace without filename
//@ ignore-sgx no processes
//@ ignore-msvc see #62897 and `backtrace-debuginfo.rs` test
//@ ignore-fuchsia Backtraces not symbolized
//@ compile-flags:-g
//@ compile-flags:-Cstrip=none
use std::env;
use std::process::{Command, Stdio};
use std::str;
#[inline(never)]
fn foo() {
let _v = vec![1, 2, 3];
if env::var_os("IS_TEST").is_some() {
panic!()
}
}
#[inline(never)]
fn double() {
struct Double;
impl Drop for Double {
fn drop(&mut self) { panic!("twice") }
}
let _d = Double;
panic!("once");
}
fn template(me: &str) -> Command {
let mut m = Command::new(me);
m.env("IS_TEST", "1")
.stdout(Stdio::piped())
.stderr(Stdio::piped());
return m;
}
fn expected(fn_name: &str) -> String {
format!(" backtrace::{}", fn_name)
}
#[cfg(not(panic = "abort"))]
fn contains_verbose_expected(s: &str, fn_name: &str) -> bool {
// HACK(eddyb) work around the fact that verbosely demangled stack traces
// (from `RUST_BACKTRACE=full`, or, as is the case here, panic-in-panic)
// may contain symbols with hashes in them, i.e. `backtrace[...]::`.
let prefix = " backtrace";
let suffix = &format!("::{}", fn_name);
s.match_indices(prefix).any(|(i, _)| {
s[i + prefix.len()..]
.trim_start_matches('[')
.trim_start_matches(char::is_alphanumeric)
.trim_start_matches(']')
.starts_with(suffix)
})
}
fn runtest(me: &str) {
// Make sure that the stack trace is printed
let p = template(me).arg("fail").env("RUST_BACKTRACE", "1").spawn().unwrap();
let out = p.wait_with_output().unwrap();
assert!(!out.status.success());
let s = str::from_utf8(&out.stderr).unwrap();
assert!(s.contains("stack backtrace") && s.contains(&expected("foo")),
"bad output: {}", s);
assert!(s.contains(" 0:"), "the frame number should start at 0");
// Make sure the stack trace is *not* printed
// (Remove RUST_BACKTRACE from our own environment, in case developer
// is running `make check` with it on.)
let p = template(me).arg("fail").env_remove("RUST_BACKTRACE").spawn().unwrap();
let out = p.wait_with_output().unwrap();
assert!(!out.status.success());
let s = str::from_utf8(&out.stderr).unwrap();
assert!(!s.contains("stack backtrace") && !s.contains(&expected("foo")),
"bad output2: {}", s);
// Make sure the stack trace is *not* printed
// (RUST_BACKTRACE=0 acts as if it were unset from our own environment,
// in case developer is running `make check` with it set.)
let p = template(me).arg("fail").env("RUST_BACKTRACE","0").spawn().unwrap();
let out = p.wait_with_output().unwrap();
assert!(!out.status.success());
let s = str::from_utf8(&out.stderr).unwrap();
assert!(!s.contains("stack backtrace") && !s.contains(" - foo"),
"bad output3: {}", s);
#[cfg(not(panic = "abort"))]
{
// Make sure a stack trace is printed
let p = template(me).arg("double-fail").env("RUST_BACKTRACE","0").spawn().unwrap();
let out = p.wait_with_output().unwrap();
assert!(!out.status.success());
let s = str::from_utf8(&out.stderr).unwrap();
// loosened the following from double::h to double:: due to
// spurious failures on mac, 32bit, optimized
assert!(
s.contains("stack backtrace") &&
s.contains("panic in a destructor during cleanup") &&
contains_verbose_expected(s, "double"),
"bad output3: {}", s
);
// Make sure it's only one stack trace.
assert_eq!(s.split("stack backtrace").count(), 2);
// Make sure a stack trace isn't printed too many times
// even with RUST_BACKTRACE=1. It should be printed twice.
let p = template(me).arg("double-fail")
.env("RUST_BACKTRACE", "1").spawn().unwrap();
let out = p.wait_with_output().unwrap();
assert!(!out.status.success());
let s = str::from_utf8(&out.stderr).unwrap();
let mut i = 0;
for _ in 0..2 {
i += s[i + 10..].find("stack backtrace").unwrap() + 10;
}
assert!(s[i + 10..].find("stack backtrace").is_none(),
"bad output4: {}", s);
}
}
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() >= 2 && args[1] == "fail" {
foo();
} else if args.len() >= 2 && args[1] == "double-fail" {
double();
} else {
runtest(&args[0]);
}
}
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