[Android] Add a java method counting script.

BUG=497911

Review URL: https://codereview.chromium.org/1188253013

Cr-Commit-Position: refs/heads/master@{#335296}

build/android/method_count.py

+#! /usr/bin/env python
+# Copyright 2015 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.
+
+import argparse
+import os
+import re
+import sys
+
+from pylib import constants
+from pylib.sdk import dexdump
+
+sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT, 'build', 'util', 'lib',
+                             'common'))
+import perf_tests_results_helper
+
+
+_METHOD_IDS_SIZE_RE = re.compile(r'^method_ids_size +: +(\d+)$')
+
+def MethodCount(dexfile):
+  for line in dexdump.DexDump(dexfile, file_summary=True):
+    m = _METHOD_IDS_SIZE_RE.match(line)
+    if m:
+      return m.group(1)
+  raise Exception('"method_ids_size" not found in dex dump of %s' % dexfile)
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      '--apk-name', help='Name of the APK to which the dexfile corresponds.')
+  parser.add_argument('dexfile')
+
+  args = parser.parse_args()
+
+  if not args.apk_name:
+    dirname, basename = os.path.split(args.dexfile)
+    while basename:
+      if 'apk' in basename:
+        args.apk_name = basename
+        break
+      dirname, basename = os.path.split(dirname)
+    else:
+      parser.error(
+          'Unable to determine apk name from %s, '
+          'and --apk-name was not provided.' % args.dexfile)
+
+  method_count = MethodCount(args.dexfile)
+  perf_tests_results_helper.PrintPerfResult(
+      '%s_methods' % args.apk_name, 'total', [method_count], 'methods')
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())
+

build/android/pylib/sdk/__init__.py

+# Copyright 2015 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.

build/android/pylib/sdk/dexdump.py

+# Copyright 2015 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.
+
+import os
+
+from pylib import cmd_helper
+from pylib import constants
+
+_DEXDUMP_PATH = os.path.join(constants.ANDROID_SDK_TOOLS, 'dexdump')
+
+def DexDump(dexfiles, file_summary=False):
+  """A wrapper around the Android SDK's dexdump tool.
+
+  Args:
+    dexfiles: The dexfile or list of dex files to dump.
+    file_summary: Display summary information from the file header. (-f)
+
+  Returns:
+    An iterable over the output lines.
+  """
+  # TODO(jbudorick): Add support for more options as necessary.
+  if isinstance(dexfiles, basestring):
+    dexfiles = [dexfiles]
+  args = [_DEXDUMP_PATH] + dexfiles
+  if file_summary:
+    args.append('-f')
+
+  return cmd_helper.IterCmdOutputLines(args)
+