107 lines
3.3 KiB
Rust
107 lines
3.3 KiB
Rust
//! Implementation of panics via stack unwinding
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//!
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//! This crate is an implementation of panics in Rust using "most native" stack
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//! unwinding mechanism of the platform this is being compiled for. This
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//! essentially gets categorized into three buckets currently:
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//!
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//! 1. MSVC targets use SEH in the `seh.rs` file.
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//! 2. Emscripten uses C++ exceptions in the `emcc.rs` file.
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//! 3. All other targets use libunwind/libgcc in the `gcc.rs` file.
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//!
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//! More documentation about each implementation can be found in the respective
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//! module.
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#![no_std]
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#![unstable(feature = "panic_unwind", issue = "32837")]
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#![doc(issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
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#![feature(core_intrinsics)]
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#![feature(lang_items)]
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#![feature(panic_unwind)]
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#![feature(staged_api)]
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#![feature(std_internals)]
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#![feature(abi_thiscall)]
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#![feature(rustc_attrs)]
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#![panic_runtime]
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#![feature(panic_runtime)]
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#![feature(c_unwind)]
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// `real_imp` is unused with Miri, so silence warnings.
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#![cfg_attr(miri, allow(dead_code))]
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use alloc::boxed::Box;
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use core::any::Any;
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use core::panic::BoxMeUp;
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cfg_if::cfg_if! {
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if #[cfg(target_os = "emscripten")] {
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#[path = "emcc.rs"]
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mod real_imp;
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} else if #[cfg(target_os = "hermit")] {
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#[path = "hermit.rs"]
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mod real_imp;
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} else if #[cfg(target_os = "l4re")] {
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// L4Re is unix family but does not yet support unwinding.
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#[path = "dummy.rs"]
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mod real_imp;
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} else if #[cfg(all(target_env = "msvc", not(target_arch = "arm")))] {
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// LLVM does not support unwinding on 32 bit ARM msvc (thumbv7a-pc-windows-msvc)
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#[path = "seh.rs"]
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mod real_imp;
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} else if #[cfg(any(
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all(target_family = "windows", target_env = "gnu"),
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target_os = "psp",
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target_os = "solid_asp3",
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all(target_family = "unix", not(target_os = "espidf")),
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all(target_vendor = "fortanix", target_env = "sgx"),
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))] {
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#[path = "gcc.rs"]
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mod real_imp;
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} else {
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// Targets that don't support unwinding.
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// - family=wasm
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// - os=none ("bare metal" targets)
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// - os=uefi
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// - os=espidf
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// - nvptx64-nvidia-cuda
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// - arch=avr
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#[path = "dummy.rs"]
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mod real_imp;
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}
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}
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cfg_if::cfg_if! {
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if #[cfg(miri)] {
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// Use the Miri runtime.
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// We still need to also load the normal runtime above, as rustc expects certain lang
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// items from there to be defined.
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#[path = "miri.rs"]
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mod imp;
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} else {
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// Use the real runtime.
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use real_imp as imp;
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}
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}
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extern "C" {
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/// Handler in std called when a panic object is dropped outside of
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/// `catch_unwind`.
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fn __rust_drop_panic() -> !;
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/// Handler in std called when a foreign exception is caught.
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fn __rust_foreign_exception() -> !;
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}
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#[rustc_std_internal_symbol]
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#[allow(improper_ctypes_definitions)]
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pub unsafe extern "C" fn __rust_panic_cleanup(payload: *mut u8) -> *mut (dyn Any + Send + 'static) {
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Box::into_raw(imp::cleanup(payload))
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}
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// Entry point for raising an exception, just delegates to the platform-specific
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// implementation.
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#[rustc_std_internal_symbol]
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pub unsafe fn __rust_start_panic(payload: &mut dyn BoxMeUp) -> u32 {
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let payload = Box::from_raw(payload.take_box());
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imp::panic(payload)
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}
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