src/vendor/backtrace/src/backtrace/unix_backtrace.rs

   1 // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use std::mem;
  12 use std::os::raw::{c_void, c_int};
  13
  14 pub struct Frame {
  15     addr: *mut c_void,
  16 }
  17
  18 impl Frame {
  19     pub fn ip(&self) -> *mut c_void { self.addr }
  20     pub fn symbol_address(&self) -> *mut c_void { self.addr }
  21 }
  22
  23 extern {
  24     fn backtrace(buf: *mut *mut c_void, sz: c_int) -> c_int;
  25 }
  26
  27 #[inline(always)]
  28 pub fn trace(cb: &mut FnMut(&super::Frame) -> bool) {
  29     const SIZE: usize = 100;
  30
  31     let mut buf: [*mut c_void; SIZE];
  32     let cnt;
  33     unsafe {
  34         buf = mem::zeroed();
  35         cnt = backtrace(buf.as_mut_ptr(), SIZE as c_int);
  36     }
  37
  38     for addr in buf[..cnt as usize].iter() {
  39         let cx = super::Frame {
  40             inner: Frame { addr: *addr },
  41         };
  42         if !cb(&cx) {
  43             return
  44         }
  45     }
  46 }