rust/tests/ui/backtrace/line-tables-only.rs

// Test that when debug info only includes line tables that backtrace is still generated
// successfully.
// Original test:
// <https://github.com/rust-lang/backtrace-rs/tree/6fa4b85b9962c3e1be8c2e5cc605cd078134152b/crates/line-tables-only>.
// Part of <https://github.com/rust-lang/rust/issues/122899> porting some backtrace tests to rustc.
// This test diverges from the original test in that it now uses a Rust library auxiliary because
// rustc now has `-Cdebuginfo=line-tables-only`.
// ignore-tidy-linelength
//@ run-pass
//@ compile-flags: -Cstrip=none -Cdebuginfo=line-tables-only
//@ ignore-android FIXME #17520
//@ ignore-fuchsia Backtraces not symbolized
//@ ignore-emscripten Requires custom symbolization code
//@ needs-unwind
//@ aux-build: line-tables-only-helper.rs

#![feature(backtrace_frames)]

extern crate line_tables_only_helper;

use std::backtrace::Backtrace;

fn assert_contains(
    backtrace: &Backtrace,
    expected_name: &str,
    expected_file: &str,
    expected_line: u32,
) {
    // FIXME(jieyouxu): fix this ugly fragile test when `BacktraceFrame` has accessors like...
    // `symbols()`.
    let backtrace = format!("{:#?}", backtrace);
    eprintln!("{}", backtrace);
    assert!(backtrace.contains(expected_name), "backtrace does not contain expected name {}", expected_name);
    assert!(backtrace.contains(expected_file), "backtrace does not contain expected file {}", expected_file);
    assert!(backtrace.contains(&expected_line.to_string()), "backtrace does not contain expected line {}", expected_line);
}

fn main() {
    std::env::set_var("RUST_BACKTRACE", "1");
    let backtrace = line_tables_only_helper::capture_backtrace();

    // FIXME(jieyouxu): for some forsaken reason on i686-msvc `foo` doesn't have an entry in the
    // line tables?
    #[cfg(not(all(target_pointer_width = "32", target_env = "msvc")))]
    {
        assert_contains(&backtrace, "foo", "line-tables-only-helper.rs", 5);
    }
    assert_contains(&backtrace, "bar", "line-tables-only-helper.rs", 10);
    assert_contains(&backtrace, "baz", "line-tables-only-helper.rs", 15);
}