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Diffstat (limited to 'src/libstd/sys/common/gnu/libbacktrace.rs')
| -rw-r--r-- | src/libstd/sys/common/gnu/libbacktrace.rs | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/src/libstd/sys/common/gnu/libbacktrace.rs b/src/libstd/sys/common/gnu/libbacktrace.rs deleted file mode 100644 index b5802afc109..00000000000 --- a/src/libstd/sys/common/gnu/libbacktrace.rs +++ /dev/null @@ -1,181 +0,0 @@ -// 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. - -use io; -use io::prelude::*; -use libc; -use sys_common::backtrace::{output, output_fileline}; - -pub fn print(w: &mut Write, idx: isize, addr: *mut libc::c_void, - symaddr: *mut libc::c_void) -> io::Result<()> { - use ffi::CStr; - use ptr; - - //////////////////////////////////////////////////////////////////////// - // libbacktrace.h API - //////////////////////////////////////////////////////////////////////// - type backtrace_syminfo_callback = - extern "C" fn(data: *mut libc::c_void, - pc: libc::uintptr_t, - symname: *const libc::c_char, - symval: libc::uintptr_t, - symsize: libc::uintptr_t); - type backtrace_full_callback = - extern "C" fn(data: *mut libc::c_void, - pc: libc::uintptr_t, - filename: *const libc::c_char, - lineno: libc::c_int, - function: *const libc::c_char) -> libc::c_int; - type backtrace_error_callback = - extern "C" fn(data: *mut libc::c_void, - msg: *const libc::c_char, - errnum: libc::c_int); - enum backtrace_state {} - #[link(name = "backtrace", kind = "static")] - #[cfg(all(not(test), not(cargobuild)))] - extern {} - - extern { - fn backtrace_create_state(filename: *const libc::c_char, - threaded: libc::c_int, - error: backtrace_error_callback, - data: *mut libc::c_void) - -> *mut backtrace_state; - fn backtrace_syminfo(state: *mut backtrace_state, - addr: libc::uintptr_t, - cb: backtrace_syminfo_callback, - error: backtrace_error_callback, - data: *mut libc::c_void) -> libc::c_int; - fn backtrace_pcinfo(state: *mut backtrace_state, - addr: libc::uintptr_t, - cb: backtrace_full_callback, - error: backtrace_error_callback, - data: *mut libc::c_void) -> libc::c_int; - } - - //////////////////////////////////////////////////////////////////////// - // helper callbacks - //////////////////////////////////////////////////////////////////////// - - type FileLine = (*const libc::c_char, libc::c_int); - - extern fn error_cb(_data: *mut libc::c_void, _msg: *const libc::c_char, - _errnum: libc::c_int) { - // do nothing for now - } - extern fn syminfo_cb(data: *mut libc::c_void, - _pc: libc::uintptr_t, - symname: *const libc::c_char, - _symval: libc::uintptr_t, - _symsize: libc::uintptr_t) { - let slot = data as *mut *const libc::c_char; - unsafe { *slot = symname; } - } - extern fn pcinfo_cb(data: *mut libc::c_void, - _pc: libc::uintptr_t, - filename: *const libc::c_char, - lineno: libc::c_int, - _function: *const libc::c_char) -> libc::c_int { - if !filename.is_null() { - let slot = data as *mut &mut [FileLine]; - let buffer = unsafe {ptr::read(slot)}; - - // if the buffer is not full, add file:line to the buffer - // and adjust the buffer for next possible calls to pcinfo_cb. - if !buffer.is_empty() { - buffer[0] = (filename, lineno); - unsafe { ptr::write(slot, &mut buffer[1..]); } - } - } - - 0 - } - - // The libbacktrace API supports creating a state, but it does not - // support destroying a state. I personally take this to mean that a - // state is meant to be created and then live forever. - // - // I would love to register an at_exit() handler which cleans up this - // state, but libbacktrace provides no way to do so. - // - // With these constraints, this function has a statically cached state - // that is calculated the first time this is requested. Remember that - // backtracing all happens serially (one global lock). - // - // Things don't work so well on not-Linux since libbacktrace can't track - // down that executable this is. We at one point used env::current_exe but - // it turns out that there are some serious security issues with that - // approach. - // - // Specifically, on certain platforms like BSDs, a malicious actor can cause - // an arbitrary file to be placed at the path returned by current_exe. - // libbacktrace does not behave defensively in the presence of ill-formed - // DWARF information, and has been demonstrated to segfault in at least one - // case. There is no evidence at the moment to suggest that a more carefully - // constructed file can't cause arbitrary code execution. As a result of all - // of this, we don't hint libbacktrace with the path to the current process. - unsafe fn init_state() -> *mut backtrace_state { - static mut STATE: *mut backtrace_state = ptr::null_mut(); - if !STATE.is_null() { return STATE } - STATE = backtrace_create_state(ptr::null(), 0, error_cb, - ptr::null_mut()); - STATE - } - - //////////////////////////////////////////////////////////////////////// - // translation - //////////////////////////////////////////////////////////////////////// - - // backtrace errors are currently swept under the rug, only I/O - // errors are reported - let state = unsafe { init_state() }; - if state.is_null() { - return output(w, idx, addr, None) - } - let mut data = ptr::null(); - let data_addr = &mut data as *mut *const libc::c_char; - let ret = unsafe { - backtrace_syminfo(state, symaddr as libc::uintptr_t, - syminfo_cb, error_cb, - data_addr as *mut libc::c_void) - }; - if ret == 0 || data.is_null() { - output(w, idx, addr, None)?; - } else { - output(w, idx, addr, Some(unsafe { CStr::from_ptr(data).to_bytes() }))?; - } - - // pcinfo may return an arbitrary number of file:line pairs, - // in the order of stack trace (i.e. inlined calls first). - // in order to avoid allocation, we stack-allocate a fixed size of entries. - const FILELINE_SIZE: usize = 32; - let mut fileline_buf = [(ptr::null(), -1); FILELINE_SIZE]; - let ret; - let fileline_count; - { - let mut fileline_win: &mut [FileLine] = &mut fileline_buf; - let fileline_addr = &mut fileline_win as *mut &mut [FileLine]; - ret = unsafe { - backtrace_pcinfo(state, addr as libc::uintptr_t, - pcinfo_cb, error_cb, - fileline_addr as *mut libc::c_void) - }; - fileline_count = FILELINE_SIZE - fileline_win.len(); - } - if ret == 0 { - for (i, &(file, line)) in fileline_buf[..fileline_count].iter().enumerate() { - if file.is_null() { continue; } // just to be sure - let file = unsafe { CStr::from_ptr(file).to_bytes() }; - output_fileline(w, file, line, i == FILELINE_SIZE - 1)?; - } - } - - Ok(()) -} |