native_heap.py revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1# Copyright 2014 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5from memory_inspector.core import stacktrace
6
7
8class NativeHeap(object):
9  """A snapshot of outstanding (i.e. not freed) native allocations.
10
11  This is typically obtained by calling |backends.Process|.DumpNativeHeap()
12  """
13
14  def __init__(self):
15    self.allocations = []
16
17  def Add(self, allocation):
18    assert(isinstance(allocation, Allocation))
19    self.allocations += [allocation]
20
21
22class Allocation(object):
23  """A Native allocation, modeled in a size*count fashion.
24
25  |count| is the number of identical stack_traces which performed the allocation
26  of |size| bytes.
27  """
28
29  def __init__(self, size, count, stack_trace):
30    assert(isinstance(stack_trace, stacktrace.Stacktrace))
31    self.size = size  # in bytes.
32    self.count = count
33    self.stack_trace = stack_trace
34
35  @property
36  def total_size(self):
37    return self.size * self.count
38
39  def __str__(self):
40    return '%d x %d : %s' % (self.count, self.size, self.stack_trace)
41