偵錯元件

[zxdb] list
  18
  19 // Return a proper greeting for the list
  20 fn greeting(names: &Vec<String>) -> String {
  21     // Join the list of names based on length
▶ 22     match names.len() {
  23         0 => String::from("Nobody"),
  24         1 => names.join(""),
  25         2 => names.join(" and "),
  26         _ => names.join(", "),
  27     }
  28 }
  29

[zxdb] list
  17 
  18 // Return a proper greeting for the list
▶ 19 std::string greeting(std::vector<std::string>& names) {
  20   // Join the list of names based on length
  21   auto number_of_names = names.size();
  22   switch (number_of_names) {
  23     case 0:
  24       return "Nobody!";
  25     case 1:
  26       return join(names, "");
  27     case 2:
  28       return join(names, " and ");
  29     default:

[zxdb] print names
vec!["Alice", "Bob", "Spot"]

[zxdb] print names
{"Alice", "Bob", "Spot"}

#[fuchsia::main(logging = true)]
async fn main() -> Result<(), anyhow::Error> {
    // ...

    // Simulate a crash 
    assert!(false, "fake crash");

    // Print a greeting to syslog
    info!("Hello, {}!", greeting(&args));

    Ok(())
}

int main(int argc, const char* argv[], char* envp[]) {
  // ...

  // Simulate a crash 
  std::strlen(nullptr);

  // Print a greeting to syslog
  FX_LOGS(INFO) << "Hello, " << echo::greeting(arguments) << "!" << std::endl;

  return 0;
}

[zxdb] frame
▶ 0 abort() • abort.c:7
  1 panic_abort::__rust_start_panic::abort() • panic_abort/src/lib.rs:43
  2 panic_abort::__rust_start_panic(…) • panic_abort/src/lib.rs:38
  3 std::panicking::rust_panic(…) • library/std/src/panicking.rs:672
  4 std::panicking::rust_panic_with_hook(…) • library/std/src/panicking.rs:642
  5 std::panicking::begin_panic::$({closure#0}<&str>)() • rust/library/std/src/panicking.rs:544
  6 std::sys_common::backtrace::$(__rust_end_short_backtrace<std::panicking::begin_panic::{closure#0}, !>)(…) • rust/library/std/src/sys_common/backtrace.rs:144
  7 std::panicking::begin_panic<…>(…) • rust/library/std/src/panicking.rs:543
  8 echo_args::main::component_entry_point::$({generator#0})(…) • main.rs:18
  9 core::future::from_generator::$({impl#1})::$(poll<echo_args::main::component_entry_point::{generator#0}>)(…) • rust/library/core/src/future/mod.rs:80
  10 core::future::future::$({impl#1})::$(poll<&mut core::future::from_generator::GenFuture<echo_args::main::component_entry_point::{generator#0}>>)(…) • future/future.rs:119
  11 futures_util::future::future::FutureExt::$(poll_unpin<core::pin::Pin<&mut core::future::from_generator::GenFuture<echo_args::main::component_entry_point::{generator#0}>>>)(…) • future/future/mod.rs:562
  12 fuchsia_async::runtime::fuchsia::executor::local::MainTask::$(poll<core::pin::Pin<&mut core::future::from_generator::GenFuture<echo_args::main::component_entry_point::{generator#0}>>>)(…) • fuchsia/src/lib/fuchsia-async/src/runtime/fuchsia/executor/local.rs:444
  13 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::$(run_singlethreaded<core::future::from_generator::GenFuture<echo_args::main::component_entry_point::{generator#0}>>)(…) • fuchsia/src/lib/fuchsia-async/src/runtime/fuchsia/executor/local.rs:73
  14 fuchsia::$(main_singlethreaded<fuchsia::init_logging_for_component_with_executor::{closure#0}, core::future::from_generator::GenFuture<echo_args::main::component_entry_point::{generator#0}>, core::result::Result<(), anyhow::Error>>)(…) • fuchsia/src/lib/fuchsia/src/lib.rs:152
  15 echo_args::main() • main.rs:7
  16 core::ops::function::FnOnce::call_once<…>(…) • /b/s/w/ir/x/w/rust/library/core/src/ops/function.rs:227
  17 std::sys_common::backtrace::__rust_begin_short_backtrace<…>(…) • rust/library/std/src/sys_common/backtrace.rs:125
  18 std::rt::lang_start::$({closure#0}<core::result::Result<(), anyhow::Error>>)() • rust/library/std/src/rt.rs:63
  19 core::ops::function::impls::$({impl#2})::call_once<…>(…) • /b/s/w/ir/x/w/rust/library/core/src/ops/function.rs:259 (inline)
  20 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:403 (inline)
  21 std::panicking::try<…>(…) • library/std/src/panicking.rs:367 (inline)
  22 std::panic::catch_unwind<…>(…) • library/std/src/panic.rs:129 (inline)
  23 std::rt::lang_start_internal::$({closure#2})() • library/std/src/rt.rs:45 (inline)
  24 std::panicking::try::$(do_call<std::rt::lang_start_internal::{closure#2}, isize>)(…) • library/std/src/panicking.rs:403 (inline)
  25 std::panicking::$(try<isize, std::rt::lang_start_internal::{closure#2}>)(…) • library/std/src/panicking.rs:367 (inline)
  26 std::panic::$(catch_unwind<std::rt::lang_start_internal::{closure#2}, isize>)(…) • library/std/src/panic.rs:129 (inline)
  27 std::rt::lang_start_internal(…) • library/std/src/rt.rs:45
  28 std::rt::lang_start<…>(…) • rust/library/std/src/rt.rs:62
  29 $elf(main) + 0x1f
  30 «libc startup» (-r expands)
  31 «libc startup» (-r expands)
  32 $elf(_start) + 0x11

[zxdb] frame
▶ 0 strlen(…) • strlen.c:21
  1 main(…) • main.cc:27
  2 «libc startup» (-r expands)
  3 «libc startup» (-r expands)
  4 $elf(_start) + 0x11

[zxdb] frame 8 print args
vec!["Alice", "Bob", "Spot"]

[zxdb] frame 1 print arguments
{"Alice", "Bob", "Spot"}