Make a valgrind tool in the same vein as the purify one.

tools/valgrind/valgrind_analyze.py

Index: tools/valgrind/valgrind_analyze.py
diff --git a/tools/valgrind/valgrind_analyze.py b/tools/valgrind/valgrind_analyze.py
new file mode 100755
index 0000000000000000000000000000000000000000..c73f6bf05309969cca80275a9ae4b8856c70c79d
--- /dev/null
+++ b/tools/valgrind/valgrind_analyze.py
@@ -0,0 +1,176 @@
+#!/usr/bin/python
+# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# valgrind_analyze.py
+
+''' Given a valgrind XML file, parses errors and uniques them.'''
+
+import logging
+import optparse
+import os
+import sys
+from xml.dom.minidom import parse
+
+# These are functions (using C++ mangled names) that we look for in stack
+# traces. We don't show stack frames while pretty printing when they are below
+# any of the following:
+_TOP_OF_STACK_POINTS = [
+  # Don't show our testing framework.
+  "testing::Test::Run()",
+  # Also don't show the internals of libc/pthread.
+  "start_thread"
+]
+
+def getTextOf(top_node, name):
+  ''' Returns all text in all DOM nodes with a certain |name| that are children
+  of |top_node|.
+  '''
+
+  text = ""
+  for nodes_named in top_node.getElementsByTagName(name):
+    text += "".join([node.data for node in nodes_named.childNodes
+                     if node.nodeType == node.TEXT_NODE])
+  return text
+
+def removeCommonRoot(source_dir, directory):
+  '''Returns a string with the string prefix |source_dir| removed from
+  |directory|.'''
+  if source_dir:
+    # Do this for safety, just in case directory is an absolute path outside of
+    # source_dir.
+    prefix = os.path.commonprefix([source_dir, directory])
+    return directory[len(prefix) + 1:]
+
+  return directory
+
+# Constants that give real names to the abbreviations in valgrind XML output.
+INSTRUCTION_POINTER = "ip"
+OBJECT_FILE = "obj"
+FUNCTION_NAME = "fn"
+SRC_FILE_DIR = "dir"
+SRC_FILE_NAME = "file"
+SRC_LINE = "line"
+
+class ValgrindError:
+  ''' Takes a <DOM Element: error> node and reads all the data from it. A
+  ValgrindError is immutable and is hashed on its pretty printed output.
+  '''
+
+  def __init__(self, source_dir, error_node):
+    ''' Copies all the relevant information out of the DOM and into object
+    properties.
+
+    Args:
+      error_node: The <error></error> DOM node we're extracting from.
+      source_dir: Prefix that should be stripped from the <dir> node.
+    '''
+
+    self._kind = getTextOf(error_node, "kind")
+    self._what = getTextOf(error_node, "what")
+
+    self._frames = []
+    stack_node = error_node.getElementsByTagName("stack")[0]
+
+    for frame in stack_node.getElementsByTagName("frame"):
+      frame_dict = {
+        INSTRUCTION_POINTER : getTextOf(frame, INSTRUCTION_POINTER),
+        OBJECT_FILE         : getTextOf(frame, OBJECT_FILE),
+        FUNCTION_NAME       : getTextOf(frame, FUNCTION_NAME),
+        SRC_FILE_DIR        : removeCommonRoot(
+            source_dir, getTextOf(frame, SRC_FILE_DIR)),
+        SRC_FILE_NAME       : getTextOf(frame, SRC_FILE_NAME),
+        SRC_LINE            : getTextOf(frame, SRC_LINE)
+      }
+
+      self._frames += [frame_dict]
+
+      if frame_dict[FUNCTION_NAME] in _TOP_OF_STACK_POINTS:
+        break
+
+  def __str__(self):
+    ''' Pretty print the type and stack frame of this specific error.'''
+    output = self._kind + "\n"
+    for frame in self._frames:
+      output += ("  " + (frame[FUNCTION_NAME] or frame[INSTRUCTION_POINTER]) +
+                 " (")
+
+      if frame[SRC_FILE_DIR] != "":
+        output += (frame[SRC_FILE_DIR] + "/" + frame[SRC_FILE_DIR] + ":" +
+                   frame[SRC_LINE])
+      else:
+        output += frame[OBJECT_FILE]
+      output += ")\n"
+
+    return output
+
+  def UniqueString(self):
+    ''' String to use for object identity. Don't print this, use str(obj)
+    instead.'''
+    rep = self._kind + " "
+    for frame in self._frames:
+      rep += frame[FUNCTION_NAME]
+
+      if frame[SRC_FILE_DIR] != "":
+        rep += frame[SRC_FILE_DIR] + "/" + frame[SRC_FILE_NAME]
+      else:
+        rep += frame[OBJECT_FILE]
+
+    return rep
+
+  def __hash__(self):
+    return hash(self.UniqueString())
+  def __eq__(self, rhs):
+    return self.UniqueString() == rhs
+
+class ValgrindAnalyze:
+  ''' Given a set of Valgrind XML files, parse all the errors out of them,
+  unique them and output the results.'''
+
+  def __init__(self, source_dir, files):
+    '''Reads in a set of files.
+
+    Args:
+      source_dir: Path to top of source tree for this build
+      files: A list of filenames.
+    '''
+
+    self._errors = set()
+    for file in files:
+      raw_errors = parse(file).getElementsByTagName("error")
+      for raw_error in raw_errors:
+        self._errors.add(ValgrindError(source_dir, raw_error))
+
+  def Report(self):
+    if self._errors:
+      logging.error("FAIL! There were %s errors: " % len(self._errors))
+
+      for error in self._errors:
+        logging.error(error)
+
+      return -1
+
+    logging.info("PASS! No errors found!")
+    return 0
+
+def _main():
+  '''For testing only. The ValgrindAnalyze class should be imported instead.'''
+  retcode = 0
+  parser = optparse.OptionParser("usage: %prog [options] <files to analyze>")
+  parser.add_option("", "--source_dir",
+                    help="path to top of source tree for this build"
+                    "(used to normalize source paths in baseline)")
+
+  (options, args) = parser.parse_args()
+  if not len(args) >= 1:
+    parser.error("no filename specified")
+  filenames = args
+
+  analyzer = ValgrindAnalyze(options.source_dir, filenames)
+  retcode = analyzer.Report()
+
+  sys.exit(retcode)
+
+if __name__ == "__main__":
+  _main()