3edcd86647
Backed out changeset b8aa677f7452 (bug 1320179) Backed out changeset 9e2f77570128 (bug 1320179) Backed out changeset 470d8143b350 (bug 1320179) Backed out changeset ea4f1b3cc7b1 (bug 1320179)
69 lines
2.4 KiB
Rust
69 lines
2.4 KiB
Rust
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#[cfg(feature="servo")]
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extern crate geckoservo;
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extern crate mp4parse_capi;
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extern crate nsstring;
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extern crate rust_url_capi;
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#[cfg(feature = "quantum_render")]
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extern crate webrender_bindings;
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use std::boxed::Box;
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use std::ffi::CStr;
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use std::os::raw::c_char;
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use std::panic;
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/// Used to implement `nsIDebug2::RustPanic` for testing purposes.
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#[no_mangle]
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pub extern "C" fn intentional_panic(message: *const c_char) {
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panic!("{}", unsafe { CStr::from_ptr(message) }.to_string_lossy());
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}
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/// Contains the panic message, if set.
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static mut PANIC_REASON: Option<(*const str, usize)> = None;
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/// Configure a panic hook to capture panic messages for crash reports.
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///
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/// We don't store this in `gMozCrashReason` because:
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/// a) Rust strings aren't null-terminated, so we'd have to allocate
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/// memory to get a null-terminated string
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/// b) The panic=abort handler is going to call `abort()` on non-Windows,
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/// which is `mozalloc_abort` for us, which will use `MOZ_CRASH` and
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/// overwrite `gMozCrashReason` with an unhelpful string.
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#[no_mangle]
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pub extern "C" fn install_rust_panic_hook() {
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panic::set_hook(Box::new(|info| {
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// Try to handle &str/String payloads, which should handle 99% of cases.
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let payload = info.payload();
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// We'll hold a raw *const str here, but it will be OK because
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// Rust is going to abort the process before the payload could be
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// deallocated.
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if let Some(s) = payload.downcast_ref::<&str>() {
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unsafe { PANIC_REASON = Some((*s as *const str, s.len())) }
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} else if let Some(s) = payload.downcast_ref::<String>() {
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unsafe { PANIC_REASON = Some((s.as_str() as *const str, s.len())) }
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} else {
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// Not the most helpful thing, but seems unlikely to happen
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// in practice.
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println!("Unhandled panic payload!");
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}
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}));
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}
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#[no_mangle]
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pub extern "C" fn get_rust_panic_reason(reason: *mut *const c_char, length: *mut usize) -> bool {
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unsafe {
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match PANIC_REASON {
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Some((s, len)) => {
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*reason = s as *const c_char;
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*length = len;
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true
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}
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None => false,
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}
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}
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}
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