Refactor dmprof: Split dmprof.py into modules.

tools/deep_memory_profiler/subcommands/stacktrace.py

+# Copyright 2013 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 sys
+
+from lib.bucket import BUCKET_ID
+from lib.subcommand import SubCommand
+
+
+class StacktraceCommand(SubCommand):
+  def __init__(self):
+    super(StacktraceCommand, self).__init__(
+        'Usage: %prog stacktrace <dump>')
+
+  def do(self, sys_argv):
+    _, args = self._parse_args(sys_argv, 1)
+    dump_path = args[1]
+    (bucket_set, dump) = SubCommand.load_basic_files(dump_path, False)
+
+    StacktraceCommand._output(dump, bucket_set, sys.stdout)
+    return 0
+
+  @staticmethod
+  def _output(dump, bucket_set, out):
+    """Outputs a given stacktrace.
+
+    Args:
+        bucket_set: A BucketSet object.
+        out: A file object to output.
+    """
+    for line in dump.iter_stacktrace:
+      words = line.split()
+      bucket = bucket_set.get(int(words[BUCKET_ID]))
+      if not bucket:
+        continue
+      for i in range(0, BUCKET_ID - 1):
+        out.write(words[i] + ' ')
+      for frame in bucket.symbolized_stackfunction:
+        out.write(frame + ' ')
+      out.write('\n')