1 files changed, 67 insertions, 0 deletions
diff --git a/Tools/Scripts/webkitpy/common/system/stack_utils.py b/Tools/Scripts/webkitpy/common/system/stack_utils.py
new file mode 100644
index 000000000..a343807bc
--- /dev/null
+++ b/Tools/Scripts/webkitpy/common/system/stack_utils.py
@@ -0,0 +1,67 @@
+# Copyright (C) 2011 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Simple routines for logging, obtaining thread stack information."""
+
+import sys
+import traceback
+
+
+def log_thread_state(logger, name, thread_id, msg=''):
+    """Log information about the given thread state."""
+    stack = _find_thread_stack(thread_id)
+    assert(stack is not None)
+    logger("")
+    logger("%s (tid %d) %s" % (name, thread_id, msg))
+    _log_stack(logger, stack)
+    logger("")
+
+
+def _find_thread_stack(thread_id):
+    """Returns a stack object that can be used to dump a stack trace for
+    the given thread id (or None if the id is not found)."""
+    for tid, stack in sys._current_frames().items():
+        if tid == thread_id:
+            return stack
+    return None
+
+
+def _log_stack(logger, stack):
+    """Log a stack trace to the logger callback."""
+    for filename, lineno, name, line in traceback.extract_stack(stack):
+        logger('File: "%s", line %d, in %s' % (filename, lineno, name))
+        if line:
+            logger('  %s' % line.strip())
+
+
+def log_traceback(logger, tb):
+    stack = traceback.extract_tb(tb)
+    for frame_str in traceback.format_list(stack):
+        for line in frame_str.split('\n'):
+            if line:
+                logger("  %s" % line)