// 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 mem;
- 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 }
-
- let filename = match ::sys::backtrace::gnu::get_executable_filename() {
- Ok((filename, file)) => {
- // filename is purposely leaked here since libbacktrace requires
- // it to stay allocated permanently, file is also leaked so that
- // the file stays locked
- let filename_ptr = filename.as_ptr();
- mem::forget(filename);
- mem::forget(file);
- filename_ptr
- },
- Err(_) => ptr::null(),
- };
-
- STATE = backtrace_create_state(filename, 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() }))?;
- }
+use ffi::CStr;
+use io;
+use mem;
+use ptr;
+use sys::backtrace::BacktraceContext;
+use sys_common::backtrace::Frame;
+
+pub fn foreach_symbol_fileline<F>(frame: Frame,
+ mut f: F,
+ _: &BacktraceContext) -> io::Result<bool>
+where F: FnMut(&[u8], libc::c_int) -> io::Result<()>
+{
// 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 fileline_count = {
+ let state = unsafe { init_state() };
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,
+ backtrace_pcinfo(state,
+ frame.exact_position as libc::uintptr_t,
+ pcinfo_cb,
+ error_cb,
fileline_addr as *mut libc::c_void)
};
- fileline_count = FILELINE_SIZE - fileline_win.len();
- }
+ FILELINE_SIZE - fileline_win.len()
+ };
if ret == 0 {
- for (i, &(file, line)) in fileline_buf[..fileline_count].iter().enumerate() {
+ for &(file, line) in &fileline_buf[..fileline_count] {
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)?;
+ f(file, line)?;
+ }
+ Ok(fileline_count == FILELINE_SIZE)
+ } else {
+ Ok(false)
+ }
+}
+
+/// Converts a pointer to symbol to its string value.
+pub fn resolve_symname<F>(frame: Frame,
+ callback: F,
+ _: &BacktraceContext) -> io::Result<()>
+ where F: FnOnce(Option<&str>) -> io::Result<()>
+{
+ let symname = {
+ let state = unsafe { init_state() };
+ if state.is_null() {
+ None
+ } else {
+ let mut data = ptr::null();
+ let data_addr = &mut data as *mut *const libc::c_char;
+ let ret = unsafe {
+ backtrace_syminfo(state,
+ frame.symbol_addr as libc::uintptr_t,
+ syminfo_cb,
+ error_cb,
+ data_addr as *mut libc::c_void)
+ };
+ if ret == 0 || data.is_null() {
+ None
+ } else {
+ unsafe {
+ CStr::from_ptr(data).to_str().ok()
+ }
+ }
+ }
+ };
+ callback(symname)
+}
+
+////////////////////////////////////////////////////////////////////////
+// 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 {}
+
+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..]); }
}
}
- Ok(())
+ 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 }
+
+ let filename = match ::sys::backtrace::gnu::get_executable_filename() {
+ Ok((filename, file)) => {
+ // filename is purposely leaked here since libbacktrace requires
+ // it to stay allocated permanently, file is also leaked so that
+ // the file stays locked
+ let filename_ptr = filename.as_ptr();
+ mem::forget(filename);
+ mem::forget(file);
+ filename_ptr
+ },
+ Err(_) => ptr::null(),
+ };
+
+ STATE = backtrace_create_state(filename, 0, error_cb,
+ ptr::null_mut());
+ STATE
}
projects / rustc.git / blobdiff