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//! Implementation of panics via stack unwinding
//!
//! This crate is an implementation of panics in Rust using "most native" stack
//! unwinding mechanism of the platform this is being compiled for. This
//! essentially gets categorized into three buckets currently:
//!
//! 1. MSVC targets use SEH in the `seh.rs` file.
//! 2. Emscripten uses C++ exceptions in the `emcc.rs` file.
//! 3. All other targets use libunwind/libgcc in the `gcc.rs` file.
//!
//! More documentation about each implementation can be found in the respective
//! module.
#![no_std]
#![unstable(feature = "panic_unwind", issue = "32837")]
#![doc(issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
#![feature(core_intrinsics)]
#![feature(lang_items)]
#![feature(panic_unwind)]
#![feature(staged_api)]
#![feature(std_internals)]
#![feature(abi_thiscall)]
#![feature(rustc_attrs)]
#![panic_runtime]
#![feature(panic_runtime)]
#![feature(c_unwind)]
// `real_imp` is unused with Miri, so silence warnings.
#![cfg_attr(miri, allow(dead_code))]
use alloc::boxed::Box;
use core::any::Any;
use core::panic::BoxMeUp;
cfg_if::cfg_if! {
if #[cfg(target_os = "emscripten")] {
#[path = "emcc.rs"]
mod real_imp;
} else if #[cfg(target_os = "hermit")] {
#[path = "hermit.rs"]
mod real_imp;
} else if #[cfg(target_os = "l4re")] {
// L4Re is unix family but does not yet support unwinding.
#[path = "dummy.rs"]
mod real_imp;
} else if #[cfg(target_env = "msvc")] {
#[path = "seh.rs"]
mod real_imp;
} else if #[cfg(any(
all(target_family = "windows", target_env = "gnu"),
target_os = "psp",
target_os = "solid_asp3",
all(target_family = "unix", not(target_os = "espidf")),
all(target_vendor = "fortanix", target_env = "sgx"),
))] {
// Rust runtime's startup objects depend on these symbols, so make them public.
#[cfg(all(target_os="windows", target_arch = "x86", target_env="gnu"))]
pub use real_imp::eh_frame_registry::*;
#[path = "gcc.rs"]
mod real_imp;
} else {
// Targets that don't support unwinding.
// - family=wasm
// - os=none ("bare metal" targets)
// - os=uefi
// - os=espidf
// - nvptx64-nvidia-cuda
// - arch=avr
#[path = "dummy.rs"]
mod real_imp;
}
}
cfg_if::cfg_if! {
if #[cfg(miri)] {
// Use the Miri runtime.
// We still need to also load the normal runtime above, as rustc expects certain lang
// items from there to be defined.
#[path = "miri.rs"]
mod imp;
} else {
// Use the real runtime.
use real_imp as imp;
}
}
extern "C" {
/// Handler in libstd called when a panic object is dropped outside of
/// `catch_unwind`.
fn __rust_drop_panic() -> !;
/// Handler in libstd called when a foreign exception is caught.
fn __rust_foreign_exception() -> !;
}
mod dwarf;
#[rustc_std_internal_symbol]
#[allow(improper_ctypes_definitions)]
pub unsafe extern "C" fn __rust_panic_cleanup(payload: *mut u8) -> *mut (dyn Any + Send + 'static) {
Box::into_raw(imp::cleanup(payload))
}
// Entry point for raising an exception, just delegates to the platform-specific
// implementation.
#[rustc_std_internal_symbol]
pub unsafe fn __rust_start_panic(payload: *mut &mut dyn BoxMeUp) -> u32 {
let payload = Box::from_raw((*payload).take_box());
imp::panic(payload)
}
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