Improve android stack parser

mojo/devtools/common/android_stack_parser/stack_utils.py

Index: mojo/devtools/common/android_stack_parser/stack_utils.py
diff --git a/mojo/devtools/common/android_stack_parser/stack_utils.py b/mojo/devtools/common/android_stack_parser/stack_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..f6efb862a4163778bccb497b5205e7e4499c1877
--- /dev/null
+++ b/mojo/devtools/common/android_stack_parser/stack_utils.py
@@ -0,0 +1,108 @@
+# 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.
+
+"""Utility functions for the stack tool."""
+
+import glob
+import os
+import os.path
+import re
+
+
+def UnzipSymbols(symbolfile, symdir=None):
+  """Unzips a file to _DEFAULT_SYMROOT and returns the unzipped location.
+
+  Args:
+    symbolfile: The .zip file to unzip
+    symdir: Optional temporary directory to use for extraction
+
+  Returns:
+    A tuple containing (the directory into which the zip file was unzipped,
+    the path to the "symbols" directory in the unzipped file).  To clean
+    up, the caller can delete the first element of the tuple.
+
+  Raises:
+    SymbolDownloadException: When the unzip fails.
+  """
+  if not symdir:
+    symdir = "%s/%s" % (_DEFAULT_SYMROOT, hash(symbolfile))
+  if not os.path.exists(symdir):
+    os.makedirs(symdir)
+
+  print "extracting %s..." % symbolfile
+  saveddir = os.getcwd()
+  os.chdir(symdir)
+  try:
+    unzipcode = subprocess.call(["unzip", "-qq", "-o", symbolfile])
+    if unzipcode > 0:
+      os.remove(symbolfile)
+      raise SymbolDownloadException("failed to extract symbol files (%s)."
+                                    % symbolfile)
+  finally:
+    os.chdir(saveddir)
+
+  android_symbols = glob.glob("%s/out/target/product/*/symbols" % symdir)
+  if android_symbols:
+    return (symdir, android_symbols[0])
+  else:
+    # This is a zip of Chrome symbols, so symbol.CHROME_SYMBOLS_DIR needs to be
+    # updated to point here.
+    symbol.CHROME_SYMBOLS_DIR = symdir
+    return (symdir, symdir)
+
+
+def GetBasenameFromMojoApp(url):
+  """Used by GetSymbolMapping() to extract the basename from the location the
+  mojo app was downloaded from. The location is a URL, e.g.
+  http://foo/bar/x.so."""
+  index = url.rfind('/')
+  return url[(index + 1):] if index != -1 else url
+
+
+def GetSymboledNameForMojoApp(path):
+  """Used by GetSymbolMapping to get the non-stripped library name for an
+  installed mojo app."""
+  # e.g. tracing.mojo -> libtracing_library.so
+  name, ext = os.path.splitext(path)
+  if ext != '.mojo':
+    return path
+  return 'lib%s_library.so' % name
+
+
+def GetSymbolMapping(lines):
+  """Returns a mapping (dictionary) from download file to .so."""
+  regex = re.compile('Caching mojo app (\S+?)(?:\?\S+)? at (\S+)')
+  mappings = {}
+  for line in lines:
+    result = regex.search(line)
+    if result:
+      url = GetBasenameFromMojoApp(result.group(1))
+      mappings[os.path.normpath(result.group(2))] = GetSymboledNameForMojoApp(
+          url)
+  return mappings
+
+
+def _LowestAncestorContainingRelpath(dir_path, relpath):
+  """Returns the lowest ancestor dir of |dir_path| that contains |relpath|.
+  """
+  cur_dir_path = os.path.abspath(dir_path)
+  while True:
+    if os.path.exists(os.path.join(cur_dir_path, relpath)):
+      return cur_dir_path
+
+    next_dir_path = os.path.dirname(cur_dir_path)
+    if next_dir_path != cur_dir_path:
+      cur_dir_path = next_dir_path
+    else:
+      return None
+
+
+def GuessDir(relpath):
+  """Returns absolute path to location |relpath| in the lowest ancestor of this
+  file that contains it."""
+  lowest_ancestor = _LowestAncestorContainingRelpath(
+      os.path.dirname(__file__), relpath)
+  if not lowest_ancestor:
+    return None
+  return os.path.join(lowest_ancestor, relpath)