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use libc;
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<()>
{
const FILELINE_SIZE: usize = 32;
let mut fileline_buf = [(ptr::null(), -1); FILELINE_SIZE];
let ret;
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,
frame.exact_position as libc::uintptr_t,
pcinfo_cb,
error_cb,
fileline_addr as *mut libc::c_void)
};
FILELINE_SIZE - fileline_win.len()
};
if ret == 0 {
for &(file, line) in &fileline_buf[..fileline_count] {
if file.is_null() { continue; }
let file = unsafe { CStr::from_ptr(file).to_bytes() };
f(file, line)?;
}
Ok(fileline_count == FILELINE_SIZE)
} else {
Ok(false)
}
}
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)
}
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;
}
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) {
}
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 !buffer.is_empty() {
buffer[0] = (filename, lineno);
unsafe { ptr::write(slot, &mut buffer[1..]); }
}
}
0
}
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)) => {
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
}