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Auto merge of #43635 - ids1024:backtrace-redox, r=alexcrichton
Make backtraces work on Redox, copying Unix implementation The `backtrace/` directory here is the same as the Unix one, except for adding an implementation of `get_executable_filename`.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,42 @@ | ||
| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution and at | ||
| // http://rust-lang.org/COPYRIGHT. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
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| /// See sys/unix/backtrace/mod.rs for an explanation of the method used here. | ||
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| pub use self::tracing::unwind_backtrace; | ||
| pub use self::printing::{foreach_symbol_fileline, resolve_symname}; | ||
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| // tracing impls: | ||
| mod tracing; | ||
| // symbol resolvers: | ||
| mod printing; | ||
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| pub mod gnu { | ||
| use io; | ||
| use fs; | ||
| use libc::c_char; | ||
| use vec::Vec; | ||
| use ffi::OsStr; | ||
| use os::unix::ffi::OsStrExt; | ||
| use io::Read; | ||
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| pub fn get_executable_filename() -> io::Result<(Vec<c_char>, fs::File)> { | ||
| let mut exefile = fs::File::open("sys:exe")?; | ||
| let mut exename = Vec::new(); | ||
| exefile.read_to_end(&mut exename)?; | ||
| if exename.last() == Some(&b'\n') { | ||
| exename.pop(); | ||
| } | ||
| let file = fs::File::open(OsStr::from_bytes(&exename))?; | ||
| Ok((exename.into_iter().map(|c| c as c_char).collect(), file)) | ||
| } | ||
| } | ||
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| pub struct BacktraceContext; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,11 @@ | ||
| // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution and at | ||
| // http://rust-lang.org/COPYRIGHT. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
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| pub use sys_common::gnu::libbacktrace::{foreach_symbol_fileline, resolve_symname}; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution and at | ||
| // http://rust-lang.org/COPYRIGHT. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
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| use error::Error; | ||
| use io; | ||
| use libc; | ||
| use sys::backtrace::BacktraceContext; | ||
| use sys_common::backtrace::Frame; | ||
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| use unwind as uw; | ||
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| struct Context<'a> { | ||
| idx: usize, | ||
| frames: &'a mut [Frame], | ||
| } | ||
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| #[derive(Debug)] | ||
| struct UnwindError(uw::_Unwind_Reason_Code); | ||
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| impl Error for UnwindError { | ||
| fn description(&self) -> &'static str { | ||
| "unexpected return value while unwinding" | ||
| } | ||
| } | ||
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| impl ::fmt::Display for UnwindError { | ||
| fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result { | ||
| write!(f, "{}: {:?}", self.description(), self.0) | ||
| } | ||
| } | ||
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| #[inline(never)] // if we know this is a function call, we can skip it when | ||
| // tracing | ||
| pub fn unwind_backtrace(frames: &mut [Frame]) | ||
| -> io::Result<(usize, BacktraceContext)> | ||
| { | ||
| let mut cx = Context { | ||
| idx: 0, | ||
| frames: frames, | ||
| }; | ||
| let result_unwind = unsafe { | ||
| uw::_Unwind_Backtrace(trace_fn, | ||
| &mut cx as *mut Context | ||
| as *mut libc::c_void) | ||
| }; | ||
| // See libunwind:src/unwind/Backtrace.c for the return values. | ||
| // No, there is no doc. | ||
| match result_unwind { | ||
| // These return codes seem to be benign and need to be ignored for backtraces | ||
| // to show up properly on all tested platforms. | ||
| uw::_URC_END_OF_STACK | uw::_URC_FATAL_PHASE1_ERROR | uw::_URC_FAILURE => { | ||
| Ok((cx.idx, BacktraceContext)) | ||
| } | ||
| _ => { | ||
| Err(io::Error::new(io::ErrorKind::Other, | ||
| UnwindError(result_unwind))) | ||
| } | ||
| } | ||
| } | ||
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| extern fn trace_fn(ctx: *mut uw::_Unwind_Context, | ||
| arg: *mut libc::c_void) -> uw::_Unwind_Reason_Code { | ||
| let cx = unsafe { &mut *(arg as *mut Context) }; | ||
| let mut ip_before_insn = 0; | ||
| let mut ip = unsafe { | ||
| uw::_Unwind_GetIPInfo(ctx, &mut ip_before_insn) as *mut libc::c_void | ||
| }; | ||
| if !ip.is_null() && ip_before_insn == 0 { | ||
| // this is a non-signaling frame, so `ip` refers to the address | ||
| // after the calling instruction. account for that. | ||
| ip = (ip as usize - 1) as *mut _; | ||
| } | ||
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| // dladdr() on osx gets whiny when we use FindEnclosingFunction, and | ||
| // it appears to work fine without it, so we only use | ||
| // FindEnclosingFunction on non-osx platforms. In doing so, we get a | ||
| // slightly more accurate stack trace in the process. | ||
| // | ||
| // This is often because panic involves the last instruction of a | ||
| // function being "call std::rt::begin_unwind", with no ret | ||
| // instructions after it. This means that the return instruction | ||
| // pointer points *outside* of the calling function, and by | ||
| // unwinding it we go back to the original function. | ||
| let symaddr = if cfg!(target_os = "macos") || cfg!(target_os = "ios") { | ||
| ip | ||
| } else { | ||
| unsafe { uw::_Unwind_FindEnclosingFunction(ip) } | ||
| }; | ||
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| if cx.idx < cx.frames.len() { | ||
| cx.frames[cx.idx] = Frame { | ||
| symbol_addr: symaddr, | ||
| exact_position: ip, | ||
| }; | ||
| cx.idx += 1; | ||
| } | ||
|
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| uw::_URC_NO_REASON | ||
| } |
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