Add StackTrace debugging utility class.

Add StackTrace debugging utility class.

For the moment, it only works on Linux, although it should be pretty easy to
get it working on Mac with __builtin_return_address and __builtin_frame_address.

It will mostly fail to resolve functions. Use this wrapper script:

import os
import sys
import subprocess
import re

address = re.compile('.*\[(0x[0-9a-fA-F]{4,8})\].*')

if __name__ == '__main__':
  p = subprocess.Popen(sys.argv[1:], stderr = subprocess.STDOUT, stdout = subprocess.PIPE)
  addr2line = subprocess.Popen(['addr2line', '-e', sys.argv[1], '-f', '-C', '-s'],
                               stdout = subprocess.PIPE, stdin = subprocess.PIPE)

  for line in p.stdout.readlines():
    m = address.match(line);
    if m is not None:
      addr2line.stdin.write(m.groups()[0] + '\n')
      function = addr2line.stdout.readline()[:-1]
      location = addr2line.stdout.readline()[:-1]
      sys.stdout.write('%s (%s)\n' % (function, location))
    else:
      sys.stdout.write(line)

[Evan Martin, 2009-01-16 02:09:04]

stars on the left,
unsigned => size_t

http://codereview.chromium.org/18303/diff/1/3
File base/debug_util_posix.cc (right):

http://codereview.chromium.org/18303/diff/1/3#newcode7
Line 7: #if defined(OS_LINUX)
i think you need a build_config include above here.

http://codereview.chromium.org/18303/diff/1/3#newcode102
Line 102: static const unsigned kMaxCallers = 64;
Can't we have call stacks deeper than 64?  Think WebKit.

http://codereview.chromium.org/18303/diff/1/3#newcode112
Line 112: backtrace_symbols_fd(&trace_[0], trace_.size(), 2);
the "2" here is stderr, right?  Isn't there some builtin constant that means
stderr for this purpose?  Otherwise it could use a comment.

http://codereview.chromium.org/18303/diff/1/3#newcode121
Line 121: fprintf(stderr, "<printing stacktraces not implemented>\n");
NOTIMPLEMENTED()

[agl, 2009-01-16 18:22:55]

http://codereview.chromium.org/18303/diff/1/3
File base/debug_util_posix.cc (right):

http://codereview.chromium.org/18303/diff/1/3#newcode7
Line 7: #if defined(OS_LINUX)
On 2009/01/16 02:09:04, Evan Martin wrote:
> i think you need a build_config include above here.

Done.

http://codereview.chromium.org/18303/diff/1/3#newcode102
Line 102: static const unsigned kMaxCallers = 64;
On 2009/01/16 02:09:04, Evan Martin wrote:
> Can't we have call stacks deeper than 64?  Think WebKit.

I'm just not sure if going deeper is actually useful, but I upped it to 256.

http://codereview.chromium.org/18303/diff/1/3#newcode112
Line 112: backtrace_symbols_fd(&trace_[0], trace_.size(), 2);
On 2009/01/16 02:09:04, Evan Martin wrote:
> the "2" here is stderr, right?  Isn't there some builtin constant that means
> stderr for this purpose?  Otherwise it could use a comment.

Replaced with STDERR_FILENO

http://codereview.chromium.org/18303/diff/1/3#newcode121
Line 121: fprintf(stderr, "<printing stacktraces not implemented>\n");
On 2009/01/16 02:09:04, Evan Martin wrote:
> NOTIMPLEMENTED()

Done.

[Evan Martin, 2009-01-16 18:30:08]

lgtm

http://codereview.chromium.org/18303/diff/205/8
File base/debug_util_posix.cc (right):

http://codereview.chromium.org/18303/diff/205/8#newcode124
Line 124: fprintf(stderr, "<printing stacktraces not implemented>\n");
you won't need this anymore with the above

http://codereview.chromium.org/18303/diff/205/9
File base/debug_util_win.cc (right):

http://codereview.chromium.org/18303/diff/205/9#newcode114
Line 114: fprintf(stderr, "<printing stacktraces not implemented>\n");
you don't need this anymore with the below