| # Copyright 2016-2017 ARM Limited |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| from trappy.ftrace import GenericFTrace |
| import re |
| |
| SYSTRACE_EVENT = re.compile( |
| r'^(?P<event>[A-Z])(\|(?P<pid>\d+)\|(?P<func>[^|]*)(\|(?P<data>.*))?)?') |
| |
| class drop_before_trace(object): |
| """Object that, when called, returns True if the line is not part of |
| the trace |
| |
| We have to first look for the "<!-- BEGIN TRACE -->" and then skip |
| the headers that start with # |
| |
| """ |
| def __init__(self, tracer): |
| self.before_begin_trace = True |
| self.before_actual_trace = True |
| self.tracer = tracer |
| |
| def __call__(self, line): |
| if self.before_begin_trace: |
| if line.startswith("<!-- BEGIN TRACE -->") or \ |
| line.startswith("<title>Android System Trace</title>"): |
| self.before_begin_trace = False |
| elif self.before_actual_trace: |
| if line.startswith(' <script class="trace-data"') or \ |
| line.startswith(" var linuxPerfData"): |
| self.before_actual_trace = False |
| |
| if not self.before_actual_trace: |
| base_call = super(SysTrace, self.tracer).trace_hasnt_started() |
| return base_call(line) |
| else: |
| return True |
| |
| class SysTrace(GenericFTrace): |
| """A wrapper that parses all events of a SysTrace run |
| |
| It receives the same parameters as :mod:`trappy.ftrace.FTrace`. |
| |
| """ |
| |
| def __init__(self, path=".", name="", normalize_time=True, scope="all", |
| events=[], window=(0, None), abs_window=(0, None)): |
| |
| self.trace_path = path |
| |
| super(SysTrace, self).__init__(name, normalize_time, scope, events, |
| window, abs_window) |
| |
| self._do_parse() |
| try: |
| self._cpus = 1 + self.sched_switch.data_frame["__cpu"].max() |
| except AttributeError: |
| pass |
| |
| def trace_hasnt_started(self): |
| return drop_before_trace(self) |
| |
| def trace_hasnt_finished(self): |
| """Return a function that returns True while the current line is still part of the trace |
| |
| In Systrace, the first line that is not part of the trace is |
| </script>. There's a further "<!-- END TRACE -->" but there's |
| not point scanning for it, we should stop parsing as soon as |
| we see the </script> |
| |
| """ |
| return lambda x: not x.endswith("</script>\n") |
| |
| def generate_data_dict(self, data_str): |
| """ Custom parsing for systrace's userspace events """ |
| data_dict = None |
| |
| match = SYSTRACE_EVENT.match(data_str) |
| if match: |
| data_dict = { |
| 'event': match.group('event'), |
| 'pid' : int(match.group('pid')) if match.group('pid') else None, |
| 'func' : match.group('func' ), |
| 'data' : match.group('data' ) |
| } |
| |
| return data_dict |