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@ -10,16 +10,26 @@
@@ -10,16 +10,26 @@
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//! Implementation of various bits and pieces of the `panic!` macro and
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//! associated runtime pieces.
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//!
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//! Specifically, this module contains the implementation of:
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//!
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//! * Panic hooks
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//! * Executing a panic up to doing the actual implementation
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//! * Shims around "try"
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use io::prelude::*; |
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use any::Any; |
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use cell::RefCell; |
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use fmt::{self, Display}; |
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use fmt; |
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use intrinsics; |
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use mem; |
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use ptr; |
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use raw; |
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use sys_common::rwlock::RWLock; |
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use sys_common::thread_info; |
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use sys_common::util; |
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use thread; |
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thread_local! { |
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pub static LOCAL_STDERR: RefCell<Option<Box<Write + Send>>> = { |
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@ -27,105 +37,414 @@ thread_local! {
@@ -27,105 +37,414 @@ thread_local! {
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} |
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} |
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///The compiler wants this to be here. Otherwise it won't be happy. And we like happy compilers.
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#[lang = "eh_personality"] |
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pub extern fn eh_personality() {} |
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#[allow(improper_ctypes)] |
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extern { |
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fn __rust_maybe_catch_panic(f: fn(*mut u8), |
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data: *mut u8, |
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data_ptr: *mut usize, |
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vtable_ptr: *mut usize) -> u32; |
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#[unwind] |
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fn __rust_start_panic(data: usize, vtable: usize) -> u32; |
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} |
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/// Determines whether the current thread is unwinding because of panic.
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// Which it won't be, since we still don't have stack unwinding.
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pub fn panicking() -> bool { |
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false |
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#[derive(Copy, Clone)] |
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enum Hook { |
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Default, |
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Custom(*mut (Fn(&PanicInfo) + 'static + Sync + Send)), |
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} |
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/// Entry point of panic from the libcore crate.
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#[lang = "panic_fmt"] |
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pub extern fn rust_begin_panic(msg: fmt::Arguments, |
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file: &'static str, |
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line: u32, |
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col: u32) -> ! { |
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begin_panic_fmt(&msg, &(file, line, col)) |
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static HOOK_LOCK: RWLock = RWLock::new(); |
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static mut HOOK: Hook = Hook::Default; |
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/// Registers a custom panic hook, replacing any that was previously registered.
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///
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/// The panic hook is invoked when a thread panics, but before the panic runtime
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/// is invoked. As such, the hook will run with both the aborting and unwinding
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/// runtimes. The default hook prints a message to standard error and generates
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/// a backtrace if requested, but this behavior can be customized with the
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/// `set_hook` and `take_hook` functions.
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///
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/// The hook is provided with a `PanicInfo` struct which contains information
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/// about the origin of the panic, including the payload passed to `panic!` and
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/// the source code location from which the panic originated.
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///
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/// The panic hook is a global resource.
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///
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/// # Panics
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///
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/// Panics if called from a panicking thread.
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///
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/// # Examples
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///
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/// The following will print "Custom panic hook":
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|_| {
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/// println!("Custom panic hook");
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn set_hook(hook: Box<Fn(&PanicInfo) + 'static + Sync + Send>) { |
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if thread::panicking() { |
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panic!("cannot modify the panic hook from a panicking thread"); |
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} |
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unsafe { |
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HOOK_LOCK.write(); |
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let old_hook = HOOK; |
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HOOK = Hook::Custom(Box::into_raw(hook)); |
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HOOK_LOCK.write_unlock(); |
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if let Hook::Custom(ptr) = old_hook { |
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Box::from_raw(ptr); |
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} |
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} |
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} |
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/// The entry point for panicking with a formatted message.
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/// Unregisters the current panic hook, returning it.
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///
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/// This is designed to reduce the amount of code required at the call
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/// site as much as possible (so that `panic!()` has as low an impact
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/// on (e.g.) the inlining of other functions as possible), by moving
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/// the actual formatting into this shared place.
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#[unstable(feature = "libstd_sys_internals",
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reason = "used by the panic! macro", |
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issue = "0")] |
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#[inline(never)] #[cold] |
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pub fn begin_panic_fmt(msg: &fmt::Arguments, file_line_col: &(&'static str, u32, u32)) -> ! { |
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use fmt::Write; |
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/// If no custom hook is registered, the default hook will be returned.
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///
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/// # Panics
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///
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/// Panics if called from a panicking thread.
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///
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/// # Examples
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///
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/// The following will print "Normal panic":
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|_| {
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/// println!("Custom panic hook");
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/// }));
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///
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/// let _ = panic::take_hook();
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn take_hook() -> Box<Fn(&PanicInfo) + 'static + Sync + Send> { |
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if thread::panicking() { |
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panic!("cannot modify the panic hook from a panicking thread"); |
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} |
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let mut s = String::new(); |
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let _ = s.write_fmt(*msg); |
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begin_panic(s, file_line_col); |
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unsafe { |
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HOOK_LOCK.write(); |
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let hook = HOOK; |
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HOOK = Hook::Default; |
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HOOK_LOCK.write_unlock(); |
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match hook { |
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Hook::Default => Box::new(default_hook), |
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Hook::Custom(ptr) => Box::from_raw(ptr), |
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} |
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} |
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} |
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/// A struct providing information about a panic.
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///
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/// `PanicInfo` structure is passed to a panic hook set by the [`set_hook`]
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/// function.
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///
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/// [`set_hook`]: ../../std/panic/fn.set_hook.html
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// println!("panic occured: {:?}", panic_info.payload().downcast_ref::<&str>().unwrap());
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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#[derive(Debug)] |
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pub struct PanicInfo<'a> { |
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payload: &'a (Any + Send), |
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location: Location<'a>, |
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} |
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impl<'a> PanicInfo<'a> { |
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/// Returns the payload associated with the panic.
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///
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/// This will commonly, but not always, be a `&'static str` or [`String`].
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///
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/// [`String`]: ../../std/string/struct.String.html
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// println!("panic occured: {:?}", panic_info.payload().downcast_ref::<&str>().unwrap());
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn payload(&self) -> &(Any + Send) { |
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self.payload |
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} |
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/// Returns information about the location from which the panic originated,
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/// if available.
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///
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/// This method will currently always return [`Some`], but this may change
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/// in future versions.
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///
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/// [`Some`]: ../../std/option/enum.Option.html#variant.Some
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// if let Some(location) = panic_info.location() {
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/// println!("panic occured in file '{}' at line {}", location.file(), location.line());
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/// } else {
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/// println!("panic occured but can't get location information...");
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/// }
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn location(&self) -> Option<&Location> { |
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Some(&self.location) |
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} |
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} |
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/// A struct containing information about the location of a panic.
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///
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/// This structure is created by the [`location`] method of [`PanicInfo`].
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///
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/// [`location`]: ../../std/panic/struct.PanicInfo.html#method.location
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/// [`PanicInfo`]: ../../std/panic/struct.PanicInfo.html
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// if let Some(location) = panic_info.location() {
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/// println!("panic occured in file '{}' at line {}", location.file(), location.line());
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/// } else {
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/// println!("panic occured but can't get location information...");
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/// }
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[derive(Debug)] |
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub struct Location<'a> { |
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file: &'a str, |
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line: u32, |
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col: u32, |
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} |
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impl<'a> Location<'a> { |
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/// Returns the name of the source file from which the panic originated.
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// if let Some(location) = panic_info.location() {
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/// println!("panic occured in file '{}'", location.file());
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/// } else {
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/// println!("panic occured but can't get location information...");
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/// }
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn file(&self) -> &str { |
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self.file |
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} |
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/// Returns the line number from which the panic originated.
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///
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/// # Examples
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///
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/// ```should_panic
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// if let Some(location) = panic_info.location() {
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/// println!("panic occured at line {}", location.line());
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/// } else {
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/// println!("panic occured but can't get location information...");
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/// }
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[stable(feature = "panic_hooks", since = "1.10.0")] |
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pub fn line(&self) -> u32 { |
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self.line |
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} |
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/// Returns the column from which the panic originated.
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///
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/// # Examples
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///
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/// ```should_panic
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/// #![feature(panic_col)]
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/// use std::panic;
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///
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/// panic::set_hook(Box::new(|panic_info| {
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/// if let Some(location) = panic_info.location() {
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/// println!("panic occured at column {}", location.column());
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/// } else {
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/// println!("panic occured but can't get location information...");
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/// }
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/// }));
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///
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/// panic!("Normal panic");
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/// ```
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#[unstable(feature = "panic_col", reason = "recently added", issue = "42939")] |
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pub fn column(&self) -> u32 { |
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self.col |
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} |
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} |
|
|
|
|
|
|
|
|
|
// Citra doesn't support the Error applet yet
|
|
|
|
|
#[cfg(feature = "citra")] |
|
|
|
|
#[unstable(feature = "libstd_sys_internals",
|
|
|
|
|
reason = "used by the panic! macro", |
|
|
|
|
issue = "0")] |
|
|
|
|
#[inline(never)] #[cold] |
|
|
|
|
pub fn begin_panic<M: Any + Send + Display>(msg: M, file_line_col: &(&'static str, u32, u32)) -> ! { |
|
|
|
|
let msg = Box::new(msg); |
|
|
|
|
let (file, line, col) = *file_line_col; |
|
|
|
|
fn default_hook(info: &PanicInfo) { |
|
|
|
|
#[cfg(feature = "backtrace")] |
|
|
|
|
use sys_common::backtrace; |
|
|
|
|
|
|
|
|
|
// 3DS-specific code begins here
|
|
|
|
|
use libctru::{consoleInit, consoleClear, gfxScreen_t, threadGetCurrent}; |
|
|
|
|
// If this is a double panic, make sure that we print a backtrace
|
|
|
|
|
// for this panic. Otherwise only print it if logging is enabled.
|
|
|
|
|
#[cfg(feature = "backtrace")] |
|
|
|
|
let log_backtrace = { |
|
|
|
|
let panics = update_panic_count(0); |
|
|
|
|
|
|
|
|
|
unsafe { |
|
|
|
|
// Set up a new console, overwriting whatever was on the top screen
|
|
|
|
|
// before we started panicking
|
|
|
|
|
let _console = consoleInit(gfxScreen_t::GFX_TOP, ptr::null_mut()); |
|
|
|
|
consoleClear(); |
|
|
|
|
if panics >= 2 { |
|
|
|
|
Some(backtrace::PrintFormat::Full) |
|
|
|
|
} else { |
|
|
|
|
backtrace::log_enabled() |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
// Determine thread name
|
|
|
|
|
let file = info.location.file; |
|
|
|
|
let line = info.location.line; |
|
|
|
|
let col = info.location.col; |
|
|
|
|
|
|
|
|
|
let msg = match info.payload.downcast_ref::<&'static str>() { |
|
|
|
|
Some(s) => *s, |
|
|
|
|
None => match info.payload.downcast_ref::<String>() { |
|
|
|
|
Some(s) => &s[..], |
|
|
|
|
None => "Box<Any>", |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
// 3DS-specific code begins here
|
|
|
|
|
use libctru::{consoleDebugInit, debugDevice}; |
|
|
|
|
use sys::stdio::Stderr; |
|
|
|
|
|
|
|
|
|
let mut err = Stderr::new().ok(); |
|
|
|
|
let thread = thread_info::current_thread(); |
|
|
|
|
let name = thread.as_ref() |
|
|
|
|
.and_then(|t| t.name()) |
|
|
|
|
.unwrap_or(if threadGetCurrent() == ptr::null_mut() {"main"} else {"<unnamed>"}); |
|
|
|
|
.unwrap_or("<unnamed>"); |
|
|
|
|
|
|
|
|
|
unsafe { |
|
|
|
|
consoleDebugInit(debugDevice::debugDevice_CONSOLE); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
println!("thread '{}' panicked at '{}', {}:{}:{}", |
|
|
|
|
let write = |err: &mut ::io::Write| { |
|
|
|
|
let _ = writeln!(err, "thread '{}' panicked at '{}', {}:{}:{}", |
|
|
|
|
name, msg, file, line, col); |
|
|
|
|
|
|
|
|
|
// Citra seems to ignore calls to svcExitProcess, and libc::abort()
|
|
|
|
|
// causes it to lock up and fill the console with endless debug statements.
|
|
|
|
|
// So instead of terminating the program, we just let it spin in the following
|
|
|
|
|
// loop. This means that any background threads might continue to run after
|
|
|
|
|
// this thread panics, but there's not a lot we can do about that currently.
|
|
|
|
|
loop { } |
|
|
|
|
#[cfg(feature = "backtrace")] |
|
|
|
|
{ |
|
|
|
|
use sync::atomic::{AtomicBool, Ordering}; |
|
|
|
|
|
|
|
|
|
static FIRST_PANIC: AtomicBool = AtomicBool::new(true); |
|
|
|
|
|
|
|
|
|
if let Some(format) = log_backtrace { |
|
|
|
|
let _ = backtrace::print(err, format); |
|
|
|
|
} else if FIRST_PANIC.compare_and_swap(true, false, Ordering::SeqCst) { |
|
|
|
|
let _ = writeln!(err, "note: Run with `RUST_BACKTRACE=1` for a backtrace."); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
let prev = LOCAL_STDERR.with(|s| s.borrow_mut().take()); |
|
|
|
|
match (prev, err.as_mut()) { |
|
|
|
|
(Some(mut stderr), _) => { |
|
|
|
|
write(&mut *stderr); |
|
|
|
|
let mut s = Some(stderr); |
|
|
|
|
LOCAL_STDERR.with(|slot| { |
|
|
|
|
*slot.borrow_mut() = s.take(); |
|
|
|
|
}); |
|
|
|
|
} |
|
|
|
|
(None, Some(ref mut err)) => { write(err) } |
|
|
|
|
_ => {} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
#[cfg(not(feature = "citra"))] |
|
|
|
|
#[unstable(feature = "libstd_sys_internals",
|
|
|
|
|
reason = "used by the panic! macro", |
|
|
|
|
issue = "0")] |
|
|
|
|
#[inline(never)] #[cold] |
|
|
|
|
pub fn begin_panic<M: Any + Send + Display>(msg: M, file_line_col: &(&'static str, u32, u32)) -> ! { |
|
|
|
|
let msg = Box::new(msg); |
|
|
|
|
let (file, line, col) = *file_line_col; |
|
|
|
|
fn default_hook(info: &PanicInfo) { |
|
|
|
|
#[cfg(feature = "backtrace")] |
|
|
|
|
use sys_common::backtrace; |
|
|
|
|
|
|
|
|
|
// If this is a double panic, make sure that we print a backtrace
|
|
|
|
|
// for this panic. Otherwise only print it if logging is enabled.
|
|
|
|
|
#[cfg(feature = "backtrace")] |
|
|
|
|
let log_backtrace = { |
|
|
|
|
let panics = update_panic_count(0); |
|
|
|
|
|
|
|
|
|
if panics >= 2 { |
|
|
|
|
Some(backtrace::PrintFormat::Full) |
|
|
|
|
} else { |
|
|
|
|
backtrace::log_enabled() |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
let file = info.location.file; |
|
|
|
|
let line = info.location.line; |
|
|
|
|
let col = info.location.col; |
|
|
|
|
|
|
|
|
|
let msg = match info.payload.downcast_ref::<&'static str>() { |
|
|
|
|
Some(s) => *s, |
|
|
|
|
None => match info.payload.downcast_ref::<String>() { |
|
|
|
|
Some(s) => &s[..], |
|
|
|
|
None => "Box<Any>", |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// 3DS-specific code begins here
|
|
|
|
|
use libctru::{errorInit, errorText, errorDisp, |
|
|
|
|
APT_HardwareResetAsync, svcExitProcess, threadGetCurrent, |
|
|
|
|
errorConf, errorType, CFG_Language}; |
|
|
|
|
use libc; |
|
|
|
|
|
|
|
|
|
unsafe { |
|
|
|
|
// Determine thread name
|
|
|
|
|
let thread = thread_info::current_thread(); |
|
|
|
|
let name = thread.as_ref() |
|
|
|
|
.and_then(|t| t.name()) |
|
|
|
|
.unwrap_or(if threadGetCurrent() == ptr::null_mut() {"main"} else {"<unnamed>"}); |
|
|
|
|
.unwrap_or("<unnamed>"); |
|
|
|
|
|
|
|
|
|
unsafe { |
|
|
|
|
// Setup error payload
|
|
|
|
|
let error_text = format!("thread '{}' panicked at '{}', {}:{}:{}", |
|
|
|
|
name, msg, file, line, col); |
|
|
|
|
|
|
|
|
|
let mut error_conf: errorConf = mem::uninitialized(); |
|
|
|
|
errorInit(&mut error_conf, |
|
|
|
|
errorType::ERROR_TEXT_WORD_WRAP, |
|
|
|
|
@ -134,16 +453,26 @@ pub fn begin_panic<M: Any + Send + Display>(msg: M, file_line_col: &(&'static st
@@ -134,16 +453,26 @@ pub fn begin_panic<M: Any + Send + Display>(msg: M, file_line_col: &(&'static st
|
|
|
|
|
|
|
|
|
|
// Display error
|
|
|
|
|
errorDisp(&mut error_conf); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// Now that we're all done printing, it's time to exit the program.
|
|
|
|
|
// We don't have stack unwinding yet, so let's just trigger a reboot
|
|
|
|
|
APT_HardwareResetAsync(); |
|
|
|
|
#[cfg(not(test))] |
|
|
|
|
#[doc(hidden)] |
|
|
|
|
#[unstable(feature = "update_panic_count", issue = "0")] |
|
|
|
|
pub fn update_panic_count(amt: isize) -> usize { |
|
|
|
|
use cell::Cell; |
|
|
|
|
thread_local! { static PANIC_COUNT: Cell<usize> = Cell::new(0) } |
|
|
|
|
|
|
|
|
|
// If rebooting fails for some reason, we extra-forcibly end the program
|
|
|
|
|
svcExitProcess() |
|
|
|
|
} |
|
|
|
|
PANIC_COUNT.with(|c| { |
|
|
|
|
let next = (c.get() as isize + amt) as usize; |
|
|
|
|
c.set(next); |
|
|
|
|
return next |
|
|
|
|
}) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
#[cfg(test)] |
|
|
|
|
pub use realstd::rt::update_panic_count; |
|
|
|
|
|
|
|
|
|
/// Invoke a closure, capturing the cause of an unwinding panic if one occurs.
|
|
|
|
|
pub unsafe fn try<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<Any + Send>> { |
|
|
|
|
#[allow(unions_with_drop_fields)] |
|
|
|
|
@ -209,29 +538,129 @@ pub unsafe fn try<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<Any + Send>> {
@@ -209,29 +538,129 @@ pub unsafe fn try<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<Any + Send>> {
|
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
#[cfg(not(test))] |
|
|
|
|
#[doc(hidden)] |
|
|
|
|
#[unstable(feature = "update_panic_count", issue = "0")] |
|
|
|
|
pub fn update_panic_count(amt: isize) -> usize { |
|
|
|
|
use cell::Cell; |
|
|
|
|
thread_local! { static PANIC_COUNT: Cell<usize> = Cell::new(0) } |
|
|
|
|
/// Determines whether the current thread is unwinding because of panic.
|
|
|
|
|
pub fn panicking() -> bool { |
|
|
|
|
update_panic_count(0) != 0 |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
PANIC_COUNT.with(|c| { |
|
|
|
|
let next = (c.get() as isize + amt) as usize; |
|
|
|
|
c.set(next); |
|
|
|
|
return next |
|
|
|
|
}) |
|
|
|
|
/// Entry point of panic from the libcore crate.
|
|
|
|
|
#[lang = "panic_fmt"] |
|
|
|
|
#[unwind] |
|
|
|
|
pub extern fn rust_begin_panic(msg: fmt::Arguments, |
|
|
|
|
file: &'static str, |
|
|
|
|
line: u32, |
|
|
|
|
col: u32) -> ! { |
|
|
|
|
begin_panic_fmt(&msg, &(file, line, col)) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// *Implementation borrowed from the libpanic_abort crate*
|
|
|
|
|
//
|
|
|
|
|
// Rust's "try" function, but if we're aborting on panics we just call the
|
|
|
|
|
// function as there's nothing else we need to do here.
|
|
|
|
|
#[allow(improper_ctypes)] |
|
|
|
|
extern fn __rust_maybe_catch_panic(f: fn(*mut u8), |
|
|
|
|
data: *mut u8, |
|
|
|
|
_data_ptr: *mut usize, |
|
|
|
|
_vtable_ptr: *mut usize) -> u32 { |
|
|
|
|
f(data); |
|
|
|
|
0 |
|
|
|
|
/// The entry point for panicking with a formatted message.
|
|
|
|
|
///
|
|
|
|
|
/// This is designed to reduce the amount of code required at the call
|
|
|
|
|
/// site as much as possible (so that `panic!()` has as low an impact
|
|
|
|
|
/// on (e.g.) the inlining of other functions as possible), by moving
|
|
|
|
|
/// the actual formatting into this shared place.
|
|
|
|
|
#[unstable(feature = "libstd_sys_internals",
|
|
|
|
|
reason = "used by the panic! macro", |
|
|
|
|
issue = "0")] |
|
|
|
|
#[inline(never)] #[cold] |
|
|
|
|
pub fn begin_panic_fmt(msg: &fmt::Arguments, |
|
|
|
|
file_line_col: &(&'static str, u32, u32)) -> ! { |
|
|
|
|
use fmt::Write; |
|
|
|
|
|
|
|
|
|
// We do two allocations here, unfortunately. But (a) they're
|
|
|
|
|
// required with the current scheme, and (b) we don't handle
|
|
|
|
|
// panic + OOM properly anyway (see comment in begin_panic
|
|
|
|
|
// below).
|
|
|
|
|
|
|
|
|
|
let mut s = String::new(); |
|
|
|
|
let _ = s.write_fmt(*msg); |
|
|
|
|
begin_panic(s, file_line_col) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// This is the entry point of panicking for panic!() and assert!().
|
|
|
|
|
#[unstable(feature = "libstd_sys_internals",
|
|
|
|
|
reason = "used by the panic! macro", |
|
|
|
|
issue = "0")] |
|
|
|
|
#[inline(never)] #[cold] // avoid code bloat at the call sites as much as possible
|
|
|
|
|
pub fn begin_panic<M: Any + Send>(msg: M, file_line_col: &(&'static str, u32, u32)) -> ! { |
|
|
|
|
// Note that this should be the only allocation performed in this code path.
|
|
|
|
|
// Currently this means that panic!() on OOM will invoke this code path,
|
|
|
|
|
// but then again we're not really ready for panic on OOM anyway. If
|
|
|
|
|
// we do start doing this, then we should propagate this allocation to
|
|
|
|
|
// be performed in the parent of this thread instead of the thread that's
|
|
|
|
|
// panicking.
|
|
|
|
|
|
|
|
|
|
rust_panic_with_hook(Box::new(msg), file_line_col) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Executes the primary logic for a panic, including checking for recursive
|
|
|
|
|
/// panics and panic hooks.
|
|
|
|
|
///
|
|
|
|
|
/// This is the entry point or panics from libcore, formatted panics, and
|
|
|
|
|
/// `Box<Any>` panics. Here we'll verify that we're not panicking recursively,
|
|
|
|
|
/// run panic hooks, and then delegate to the actual implementation of panics.
|
|
|
|
|
#[inline(never)] |
|
|
|
|
#[cold] |
|
|
|
|
fn rust_panic_with_hook(msg: Box<Any + Send>, |
|
|
|
|
file_line_col: &(&'static str, u32, u32)) -> ! { |
|
|
|
|
let (file, line, col) = *file_line_col; |
|
|
|
|
|
|
|
|
|
let panics = update_panic_count(1); |
|
|
|
|
|
|
|
|
|
// If this is the third nested call (e.g. panics == 2, this is 0-indexed),
|
|
|
|
|
// the panic hook probably triggered the last panic, otherwise the
|
|
|
|
|
// double-panic check would have aborted the process. In this case abort the
|
|
|
|
|
// process real quickly as we don't want to try calling it again as it'll
|
|
|
|
|
// probably just panic again.
|
|
|
|
|
if panics > 2 { |
|
|
|
|
util::dumb_print(format_args!("thread panicked while processing \ |
|
|
|
|
panic. aborting.\n")); |
|
|
|
|
unsafe { intrinsics::abort() } |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
unsafe { |
|
|
|
|
let info = PanicInfo { |
|
|
|
|
payload: &*msg, |
|
|
|
|
location: Location { |
|
|
|
|
file, |
|
|
|
|
line, |
|
|
|
|
col, |
|
|
|
|
}, |
|
|
|
|
}; |
|
|
|
|
HOOK_LOCK.read(); |
|
|
|
|
match HOOK { |
|
|
|
|
Hook::Default => default_hook(&info), |
|
|
|
|
Hook::Custom(ptr) => (*ptr)(&info), |
|
|
|
|
} |
|
|
|
|
HOOK_LOCK.read_unlock(); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
if panics > 1 { |
|
|
|
|
// If a thread panics while it's already unwinding then we
|
|
|
|
|
// have limited options. Currently our preference is to
|
|
|
|
|
// just abort. In the future we may consider resuming
|
|
|
|
|
// unwinding or otherwise exiting the thread cleanly.
|
|
|
|
|
util::dumb_print(format_args!("thread panicked while panicking. \ |
|
|
|
|
aborting.\n")); |
|
|
|
|
unsafe { intrinsics::abort() } |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
rust_panic(msg) |
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} |
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/// Shim around rust_panic. Called by resume_unwind.
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pub fn update_count_then_panic(msg: Box<Any + Send>) -> ! { |
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update_panic_count(1); |
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rust_panic(msg) |
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} |
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/// A private no-mangle function on which to slap yer breakpoints.
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#[no_mangle] |
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#[allow(private_no_mangle_fns)] // yes we get it, but we like breakpoints
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pub fn rust_panic(msg: Box<Any + Send>) -> ! { |
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let code = unsafe { |
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let obj = mem::transmute::<_, raw::TraitObject>(msg); |
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__rust_start_panic(obj.data as usize, obj.vtable as usize) |
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}; |
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rtabort!("failed to initiate panic, error {}", code) |
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} |
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Ronald Kinard
7 years ago
committed by