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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(
- html_root_url = "https://doc.rust-lang.org/nightly/",
- issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/"
-)]
-#![feature(core_intrinsics)]
-#![feature(lang_items)]
-#![feature(libc)]
-#![feature(nll)]
-#![feature(panic_unwind)]
-#![feature(staged_api)]
-#![feature(std_internals)]
-#![feature(unwind_attributes)]
-#![feature(abi_thiscall)]
-#![feature(rustc_attrs)]
-#![feature(raw)]
-#![panic_runtime]
-#![feature(panic_runtime)]
-// `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_env = "msvc")] {
- #[path = "seh.rs"]
- mod real_imp;
- } else if #[cfg(any(
- all(target_family = "windows", target_env = "gnu"),
- target_os = "cloudabi",
- target_family = "unix",
- 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.
- // - arch=wasm32
- // - os=none ("bare metal" targets)
- // - os=uefi
- // - nvptx64-nvidia-cuda
- // - avr-unknown-unknown
- // - mipsel-sony-psp
- #[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() -> !;
-}
-
-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]
-#[unwind(allowed)]
-pub unsafe extern "C" fn __rust_start_panic(payload: usize) -> u32 {
- let payload = payload as *mut &mut dyn BoxMeUp;
- let payload = (*payload).take_box();
-
- imp::panic(Box::from_raw(payload))
-}