src/libstd/sys/windows/printing/msvc.rs

   1 // Copyright 2014 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 sys_common::backtrace::{output, output_fileline};
  12 use ffi::CStr;
  13 use dynamic_lib::DynamicLibrary;
  14 use super::{SymFromAddrFn, SymGetLineFromAddr64Fn, SYMBOL_INFO, MAX_SYM_NAME, IMAGEHLP_LINE64};
  15 use io;
  16 use io::prelude::*;
  17 use intrinsics;
  18 use libc;
  19
  20 pub fn print(w: &mut Write, i: isize, addr: u64, dbghelp: &DynamicLibrary, process: libc::HANDLE)
  21         -> io::Result<()> {
  22     let SymFromAddr = sym!(dbghelp, "SymFromAddr", SymFromAddrFn);
  23     let SymGetLineFromAddr64 = sym!(dbghelp, "SymGetLineFromAddr64", SymGetLineFromAddr64Fn);
  24
  25     let mut info: SYMBOL_INFO = unsafe { intrinsics::init() };
  26     info.MaxNameLen = MAX_SYM_NAME as libc::c_ulong;
  27     // the struct size in C.  the value is different to
  28     // `size_of::<SYMBOL_INFO>() - MAX_SYM_NAME + 1` (== 81)
  29     // due to struct alignment.
  30     info.SizeOfStruct = 88;
  31
  32     let mut displacement = 0u64;
  33     let ret = SymFromAddr(process, addr, &mut displacement, &mut info);
  34
  35     let name = if ret == libc::TRUE {
  36         let ptr = info.Name.as_ptr() as *const libc::c_char;
  37         Some(unsafe { CStr::from_ptr(ptr).to_bytes() })
  38     } else {
  39         None
  40     };
  41
  42     try!(output(w, i, addr as usize as *mut libc::c_void, name));
  43
  44     // Now find out the filename and line number
  45     let mut line: IMAGEHLP_LINE64 = unsafe { intrinsics::init() };
  46     line.SizeOfStruct = ::mem::size_of::<IMAGEHLP_LINE64>() as u32;
  47
  48     let mut displacement = 0u32;
  49     let ret = SymGetLineFromAddr64(process, addr, &mut displacement, &mut line);
  50     if ret == libc::TRUE {
  51         output_fileline(w,
  52                         unsafe { CStr::from_ptr(line.Filename).to_bytes() },
  53                         line.LineNumber as libc::c_int,
  54                         false)
  55     } else {
  56         Ok(())
  57     }
  58 }