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#!/usr/bin/env python
#
# This script takes b2g process profiles and merged them into a single profile.
# The meta data is taken from the first profile. The startTime for each profile
# is used to syncronized the samples. Each thread is moved into the merged
# profile.
#
import json
import re
import sys
def MergeProfiles(files):
threads = []
fileData = []
symTable = dict()
meta = None
libs = None
videoUrl = None
minStartTime = None
for fname in files:
if fname.startswith("--video="):
videoUrl = fname[8:]
continue
match = re.match('profile_([0-9]+)_(.+)\.sym', fname)
if match is None:
raise Exception("Filename '" + fname + "' doesn't match expected pattern")
pid = match.groups(0)[0]
pname = match.groups(0)[1]
fp = open(fname, "r")
fileData = json.load(fp)
fp.close()
if meta is None:
meta = fileData['profileJSON']['meta'].copy()
libs = fileData['profileJSON']['libs']
minStartTime = meta['startTime']
else:
minStartTime = min(minStartTime, fileData['profileJSON']['meta']['startTime'])
meta['startTime'] = minStartTime
for thread in fileData['profileJSON']['threads']:
thread['name'] = thread['name'] + " (" + pname + ":" + pid + ")"
threads.append(thread)
# Note that pid + sym, pid + location could be ambigious
# if we had pid=11 sym=1 && pid=1 sym=11.
pidStr = pid + ":"
thread['startTime'] = fileData['profileJSON']['meta']['startTime']
if meta['version'] >= 3:
stringTable = thread['stringTable']
for i, str in enumerate(stringTable):
if str[:2] == '0x':
newLoc = pidStr + str
stringTable[i] = newLoc
symTable[newLoc] = str
else:
samples = thread['samples']
for sample in thread['samples']:
for frame in sample['frames']:
if "location" in frame and frame['location'][0:2] == '0x':
oldLoc = frame['location']
newLoc = pidStr + oldLoc
frame['location'] = newLoc
# Default to the unprefixed symbol if no translation is
symTable[newLoc] = oldLoc
filesyms = fileData['symbolicationTable']
for sym in filesyms.keys():
symTable[pidStr + sym] = filesyms[sym]
# For each thread, make the time offsets line up based on the
# earliest start
for thread in threads:
delta = thread['startTime'] - minStartTime
if meta['version'] >= 3:
idxTime = thread['samples']['schema']['time']
for sample in thread['samples']['data']:
sample[idxTime] += delta
idxTime = thread['markers']['schema']['time']
for marker in thread['markers']['data']:
marker[idxTime] += delta
else:
for sample in thread['samples']:
if "time" in sample:
sample['time'] += delta
for marker in thread['markers']:
marker['time'] += delta
result = dict()
result['profileJSON'] = dict()
result['profileJSON']['meta'] = meta
result['profileJSON']['libs'] = libs
result['profileJSON']['threads'] = threads
result['symbolicationTable'] = symTable
result['format'] = "profileJSONWithSymbolicationTable,1"
if videoUrl:
result['profileJSON']['meta']['videoCapture'] = {"src": videoUrl}
json.dump(result, sys.stdout)
if len(sys.argv) > 1:
MergeProfiles(sys.argv[1:])
sys.exit(0)
print "Usage: merge-profile.py profile_<pid1>_<pname1>.sym profile_<pid2>_<pname2>.sym > merged.sym"
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