1 # Copyright (c) 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.
5 from threading import Lock
7 from common import utils
12 """Represents a blame object.
14 The object contains blame information for one line of stack, and this
15 information is shown when there are no CLs that change the crashing files.
17 line_content: The content of the line to find the blame for.
18 component_name: The name of the component for this line.
19 stack_frame_index: The stack frame index of this file.
20 file_name: The name of the file.
21 line_number: The line that caused a crash.
22 author: The author of this line on the latest revision.
23 crash_revision: The revision that caused the crash.
24 revision: The latest revision of this line before the crash revision.
25 url: The url of the change for the revision.
26 range_start: The starting range of the regression for this component.
27 range_end: The ending range of the regression.
31 def __init__(self, line_content, component_name, stack_frame_index,
32 file_name, line_number, author, revision, message,
33 url, range_start, range_end):
34 # Set all the variables from the arguments.
35 self.line_content = line_content
36 self.component_name = component_name
37 self.stack_frame_index = stack_frame_index
39 self.line_number = line_number
41 self.revision = revision
42 self.message = message
44 self.range_start = range_start
45 self.range_end = range_end
48 class BlameList(object):
49 """Represents a list of blame objects.
56 self.blame_list_lock = Lock()
58 def __getitem__(self, index):
59 return self.blame_list[index]
61 def FindBlame(self, callstack, component_to_crash_revision_dict,
62 component_to_regression_dict, parsers,
64 """Given a stack within a stacktrace, retrieves blame information.
66 Only either first 'top_n_frames' or the length of stack, whichever is
67 shorter, results are returned. The default value of 'top_n_frames' is 10.
70 callstack: The list of stack frames.
71 component_to_crash_revision_dict: A dictionary that maps component to its
73 component_to_regression_dict: A dictionary that maps component to its
75 parsers: A list of two parsers, svn_parser and git_parser
76 top_n_frames: A number of stack frames to show the blame result for.
78 # Only return blame information for first 'top_n_frames' frames.
79 stack_frames = callstack.GetTopNFrames(top_n_frames)
81 # Iterate through frames in stack.
82 for stack_frame in stack_frames:
83 # If the component this line is from does not have a crash revision,
84 # it is not possible to get blame information, so ignore this line.
85 component_path = stack_frame.component_path
86 if component_path not in component_to_crash_revision_dict:
89 crash_revision = component_to_crash_revision_dict[
90 component_path]['revision']
93 repository_type = crash_utils.GetRepositoryType(crash_revision)
94 repository_parser = parsers[repository_type]
96 # If the revision is in SVN, and if regression information is available,
97 # get it. For Git, we cannot know the ordering between hash numbers.
98 if repository_type == 'svn':
99 if component_to_regression_dict and \
100 component_path in component_to_regression_dict:
101 component_object = component_to_regression_dict[component_path]
102 range_start = int(component_object['old_revision'])
103 range_end = int(component_object['new_revision'])
105 # Create a task to generate blame entry.
107 'function': self.__GenerateBlameEntry,
108 'args': [repository_parser, stack_frame, crash_revision,
109 range_start, range_end]})
112 crash_utils.RunTasks(tasks)
114 def __GenerateBlameEntry(self, repository_parser, stack_frame,
115 crash_revision, range_start, range_end):
116 """Generates blame list from the arguments."""
117 stack_frame_index = stack_frame.index
118 component_path = stack_frame.component_path
119 component_name = stack_frame.component_name
120 file_name = stack_frame.file_name
121 file_path = stack_frame.file_path
122 crashed_line_number = stack_frame.crashed_line_range[0]
124 if file_path.startswith(component_path):
125 file_path = file_path[len(component_path):]
127 # Parse blame information.
128 parsed_blame_info = repository_parser.ParseBlameInfo(
129 component_path, file_path, crashed_line_number, crash_revision)
131 # If it fails to retrieve information, do not do anything.
132 if not parsed_blame_info:
135 # Create blame object from the parsed info and add it to the list.
136 (line_content, revision, author, url, message) = parsed_blame_info
137 blame = Blame(line_content, component_name, stack_frame_index, file_name,
138 crashed_line_number, author, revision, message, url,
139 range_start, range_end)
141 with self.blame_list_lock:
142 self.blame_list.append(blame)
144 def FilterAndSortBlameList(self):
145 """Filters and sorts the blame list."""
146 # Sort the blame list by its position in stack.
147 self.blame_list.sort(key=lambda blame: blame.stack_frame_index)
149 filtered_blame_list = []
151 for blame in self.blame_list:
152 # If regression information is available, check if it needs to be
154 if blame.range_start and blame.range_end:
156 # Discards results that are after the end of regression.
157 if not utils.IsGitHash(blame.revision) and (
158 int(blame.range_end) <= int(blame.revision)):
161 filtered_blame_list.append(blame)
163 self.blame_list = filtered_blame_list