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# 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
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):
self.before_begin_trace = True
self.before_script_trace_data = True
self.before_actual_trace = True
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_script_trace_data:
if line.startswith(' <script class="trace-data"') or \
line.startswith(" var linuxPerfData"):
self.before_script_trace_data = False
elif not line.startswith("#"):
self.before_actual_trace = False
return self.before_actual_trace
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=[], event_callbacks={}, window=(0, None),
abs_window=(0, None), build_df=True):
self.trace_path = path
super(SysTrace, self).__init__(name, normalize_time, scope, events,
event_callbacks, window, abs_window,
build_df)
if not build_df:
return
try:
self._cpus = 1 + self.sched_switch.data_frame["__cpu"].max()
except AttributeError:
pass
def trace_hasnt_started(self):
return drop_before_trace()
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")
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