mirror of
https://github.com/rust-lang/rust.git
synced 2026-05-04 09:53:04 +03:00
Alex Crichton
0ec321f7b5
This commit is an implementation of [RFC 1513] which allows applications to alter the behavior of panics at compile time. A new compiler flag, `-C panic`, is added and accepts the values `unwind` or `panic`, with the default being `unwind`. This model affects how code is generated for the local crate, skipping generation of landing pads with `-C panic=abort`. [RFC 1513]: https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md Panic implementations are then provided by crates tagged with `#![panic_runtime]` and lazily required by crates with `#![needs_panic_runtime]`. The panic strategy (`-C panic` value) of the panic runtime must match the final product, and if the panic strategy is not `abort` then the entire DAG must have the same panic strategy. With the `-C panic=abort` strategy, users can expect a stable method to disable generation of landing pads, improving optimization in niche scenarios, decreasing compile time, and decreasing output binary size. With the `-C panic=unwind` strategy users can expect the existing ability to isolate failure in Rust code from the outside world. Organizationally, this commit dismantles the `sys_common::unwind` module in favor of some bits moving part of it to `libpanic_unwind` and the rest into the `panicking` module in libstd. The custom panic runtime support is pretty similar to the custom allocator support with the only major difference being how the panic runtime is injected (takes the `-C panic` flag into account).
72 lines
2.2 KiB
Rust
72 lines
2.2 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Runtime services
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//!
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//! The `rt` module provides a narrow set of runtime services,
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//! including the global heap (exported in `heap`) and unwinding and
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//! backtrace support. The APIs in this module are highly unstable,
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//! and should be considered as private implementation details for the
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//! time being.
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#![unstable(feature = "rt",
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reason = "this public module should not exist and is highly likely \
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to disappear",
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issue = "0")]
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#![doc(hidden)]
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// Reexport some of our utilities which are expected by other crates.
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pub use panicking::{begin_panic, begin_panic_fmt};
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#[cfg(stage0)]
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pub use panicking::begin_panic as begin_unwind;
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#[cfg(not(test))]
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#[lang = "start"]
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fn lang_start(main: *const u8, argc: isize, argv: *const *const u8) -> isize {
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use borrow::ToOwned;
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use mem;
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use panic;
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use sys;
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use sys_common;
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use sys_common::thread_info::{self, NewThread};
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use thread::Thread;
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sys::init();
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let failed = unsafe {
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let main_guard = sys::thread::guard::init();
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sys::stack_overflow::init();
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// Next, set up the current Thread with the guard information we just
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// created. Note that this isn't necessary in general for new threads,
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// but we just do this to name the main thread and to give it correct
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// info about the stack bounds.
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let thread: Thread = NewThread::new(Some("<main>".to_owned()));
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thread_info::set(main_guard, thread);
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// Store our args if necessary in a squirreled away location
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sys_common::args::init(argc, argv);
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// Let's run some code!
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let res = panic::catch_unwind(mem::transmute::<_, fn()>(main));
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sys_common::cleanup();
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res.is_err()
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};
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if failed {
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101
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} else {
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0
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}
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}
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