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simpletrace: changed naming of edict and idtoname to improve readability

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Readability is subjective, but I've expanded the naming of the variables
and arguments, to help with understanding for new eyes on the code.

Signed-off-by: Mads Ynddal <m.ynddal@samsung.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20230926103436.25700-5-mads@ynddal.dk
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Mads Ynddal 2023-09-26 12:34:26 +02:00 committed by Stefan Hajnoczi
parent f7bd4f0237
commit 3b71b61e9f
1 changed files with 17 additions and 17 deletions
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34
scripts/simpletrace.py
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@ -40,17 +40,17 @@ def read_header(fobj, hfmt):
return None
return struct.unpack(hfmt, hdr)
def get_record(edict, idtoname, rechdr, fobj):
def get_record(event_mapping, event_id_to_name, rechdr, fobj):
"""Deserialize a trace record from a file into a tuple
(name, timestamp, pid, arg1, ..., arg6)."""
if rechdr is None:
return None
if rechdr[0] != dropped_event_id:
event_id = rechdr[0]
name = idtoname[event_id]
name = event_id_to_name[event_id]
rec = (name, rechdr[1], rechdr[3])
try:
event = edict[name]
event = event_mapping[name]
except KeyError as e:
sys.stderr.write('%s event is logged but is not declared ' \
'in the trace events file, try using ' \
@ -79,10 +79,10 @@ def get_mapping(fobj):
return (event_id, name)
def read_record(edict, idtoname, fobj):
def read_record(event_mapping, event_id_to_name, fobj):
"""Deserialize a trace record from a file into a tuple (event_num, timestamp, pid, arg1, ..., arg6)."""
rechdr = read_header(fobj, rec_header_fmt)
return get_record(edict, idtoname, rechdr, fobj)
return get_record(event_mapping, event_id_to_name, rechdr, fobj)
def read_trace_header(fobj):
"""Read and verify trace file header"""
@ -103,14 +103,14 @@ def read_trace_header(fobj):
raise ValueError('Log format %d not supported with this QEMU release!'
% log_version)
def read_trace_records(edict, idtoname, fobj):
def read_trace_records(event_mapping, event_id_to_name, fobj):
"""Deserialize trace records from a file, yielding record tuples (event_num, timestamp, pid, arg1, ..., arg6).
Note that `idtoname` is modified if the file contains mapping records.
Note that `event_id_to_name` is modified if the file contains mapping records.
Args:
edict (str -> Event): events dict, indexed by name
idtoname (int -> str): event names dict, indexed by event ID
event_mapping (str -> Event): events dict, indexed by name
event_id_to_name (int -> str): event names dict, indexed by event ID
fobj (file): input file
"""
@ -122,9 +122,9 @@ def read_trace_records(edict, idtoname, fobj):
(rectype, ) = struct.unpack('=Q', t)
if rectype == record_type_mapping:
event_id, name = get_mapping(fobj)
idtoname[event_id] = name
event_id_to_name[event_id] = name
else:
rec = read_record(edict, idtoname, fobj)
rec = read_record(event_mapping, event_id_to_name, fobj)
yield rec
@ -201,16 +201,16 @@ def process(events, log, analyzer, read_header=True):
frameinfo = inspect.getframeinfo(inspect.currentframe())
dropped_event = Event.build("Dropped_Event(uint64_t num_events_dropped)",
frameinfo.lineno + 1, frameinfo.filename)
edict = {"dropped": dropped_event}
idtoname = {dropped_event_id: "dropped"}
event_mapping = {"dropped": dropped_event}
event_id_to_name = {dropped_event_id: "dropped"}
for event in events_list:
edict[event.name] = event
event_mapping[event.name] = event
# If there is no header assume event ID mapping matches events list
if not read_header:
for event_id, event in enumerate(events_list):
idtoname[event_id] = event.name
event_id_to_name[event_id] = event.name
def build_fn(analyzer, event):
if isinstance(event, str):
@ -234,9 +234,9 @@ def process(events, log, analyzer, read_header=True):
analyzer.begin()
fn_cache = {}
for rec in read_trace_records(edict, idtoname, log):
for rec in read_trace_records(event_mapping, event_id_to_name, log):
event_num = rec[0]
event = edict[event_num]
event = event_mapping[event_num]
if event_num not in fn_cache:
fn_cache[event_num] = build_fn(analyzer, event)
fn_cache[event_num](event, rec)