From 5485cdcb5bc72c71dd67d982dadf76dd9c78328c Mon Sep 17 00:00:00 2001
From: "agl@chromium.org"
 <agl@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Fri, 16 Jan 2009 21:17:30 +0000
Subject: 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)

Review URL: http://codereview.chromium.org/18303


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8218 0039d316-1c4b-4281-b951-d872f2087c98
---
 base/debug_util_posix.cc | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'base/debug_util_posix.cc')

diff --git a/base/debug_util_posix.cc b/base/debug_util_posix.cc
index a83e144..466bb0e 100644
--- a/base/debug_util_posix.cc
+++ b/base/debug_util_posix.cc
@@ -2,8 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "build/build_config.h"
 #include "base/debug_util.h"
 
+#if defined(OS_LINUX)
+#include <unistd.h>
+#include <execinfo.h>
+#endif
+
+#include <stdio.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/sysctl.h>
@@ -90,3 +97,37 @@ bool DebugUtil::BeingDebugged() {
 void DebugUtil::BreakDebugger() {
   asm ("int3");
 }
+
+#if defined(OS_LINUX)
+
+StackTrace::StackTrace() {
+  static const unsigned kMaxCallers = 256;
+
+  void* callers[kMaxCallers];
+  int count = backtrace(callers, kMaxCallers);
+  trace_.resize(count);
+  memcpy(&trace_[0], callers, sizeof(void*) * count);
+}
+
+void StackTrace::PrintBacktrace() {
+  fflush(stderr);
+  backtrace_symbols_fd(&trace_[0], trace_.size(), STDERR_FILENO);
+}
+
+#elif defined(OS_MACOSX)
+
+// TODO(port): complete this code
+StackTrace::StackTrace() { }
+
+StackTrace::PrintBacktrace() {
+  NOTIMPLEMENTED();
+}
+
+#endif  // defined(OS_MACOSX)
+
+const void *const *StackTrace::Addresses(size_t* count) {
+  *count = trace_.size();
+  if (trace_.size())
+    return &trace_[0];
+  return NULL;
+}
-- 
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