#![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/")]
-
+#![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(raw)]
#![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::intrinsics;
-use core::mem;
-use core::raw;
+use core::any::Any;
use core::panic::BoxMeUp;
cfg_if::cfg_if! {
- if #[cfg(miri)] {
- #[path = "miri.rs"]
- mod imp;
- } else if #[cfg(target_os = "emscripten")] {
+ if #[cfg(target_os = "emscripten")] {
#[path = "emcc.rs"]
- mod imp;
+ mod real_imp;
} else if #[cfg(target_arch = "wasm32")] {
#[path = "dummy.rs"]
- mod imp;
+ mod real_imp;
} else if #[cfg(target_os = "hermit")] {
#[path = "hermit.rs"]
- mod imp;
- } else if #[cfg(all(target_env = "msvc", target_arch = "aarch64"))] {
- #[path = "dummy.rs"]
- mod imp;
+ mod real_imp;
} else if #[cfg(target_env = "msvc")] {
#[path = "seh.rs"]
- mod imp;
+ mod real_imp;
} else {
// 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 imp::eh_frame_registry::*;
+ pub use real_imp::eh_frame_registry::*;
#[path = "gcc.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;
-// Entry point for catching an exception, implemented using the `try` intrinsic
-// in the compiler.
-//
-// The interaction between the `payload` function and the compiler is pretty
-// hairy and tightly coupled, for more information see the compiler's
-// implementation of this.
-#[no_mangle]
-pub unsafe extern "C" fn __rust_maybe_catch_panic(f: fn(*mut u8),
- data: *mut u8,
- data_ptr: *mut usize,
- vtable_ptr: *mut usize)
- -> u32 {
- let mut payload = imp::payload();
- if intrinsics::r#try(f, data, &mut payload as *mut _ as *mut _) == 0 {
- 0
- } else {
- let obj = mem::transmute::<_, raw::TraitObject>(imp::cleanup(payload));
- *data_ptr = obj.data as usize;
- *vtable_ptr = obj.vtable as usize;
- 1
- }
+#[rustc_std_internal_symbol]
+#[cfg_attr(not(bootstrap), 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.
-#[no_mangle]
+#[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;
- imp::panic(Box::from_raw((*payload).take_box()))
+ let payload = (*payload).take_box();
+
+ imp::panic(Box::from_raw(payload))
}