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#!/usr/bin/python3
#
# Copyright 2019, The Android Open Source Project
#
# 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.
"""
Usage: mkflame.py <jvmti_trace_file>
"""
import argparse
import sys
class TraceCollection:
def __init__(self, args):
self.args = args
# A table indexed by number and containing the definition for that number.
self.definitions = {}
# The "weight" of a stack trace, either 1 for counting or the size of the allocation.
self.weights = {}
# The count for each individual allocation.
self.allocation_count = {}
def definition(self, index):
"""
Returns the definition for "index".
"""
return self.definitions[index]
def set_definition(self, index, definition):
"""
Sets the definition for "index".
"""
self.definitions[index] = definition
def weight(self, index):
"""
Returns the weight for "index".
"""
return self.weights[index]
def set_weight(self, index, weight):
"""
Sets the weight for "index".
"""
self.weights[index] = weight
def read_file(self, filename):
"""
Reads a file into a DefinitionTable.
"""
def process_definition(line):
"""
Adds line to the list of definitions in table.
"""
def expand_stack_trace(definition):
"""
Converts a semicolon-separated list of numbers into the text stack trace.
"""
def get_allocation_thread(thread_type_size):
"""
Returns the thread of an allocation from the thread/type/size record.
"""
THREAD_STRING = "thread["
THREAD_STRING_LEN = len(THREAD_STRING)
thread_string = thread_type_size[thread_type_size.find(THREAD_STRING) +
THREAD_STRING_LEN:]
return thread_string[:thread_string.find("]")]
def get_allocation_type(thread_type_size):
"""
Returns the type of an allocation from the thread/type/size record.
"""
TYPE_STRING = "jclass["
TYPE_STRING_LEN = len(TYPE_STRING)
type_string = thread_type_size[thread_type_size.find(TYPE_STRING) + TYPE_STRING_LEN:]
return type_string[:type_string.find(" ")]
def get_allocation_size(thread_type_size):
"""
Returns the size of an allocation from the thread/type/size record.
"""
SIZE_STRING = "size["
SIZE_STRING_LEN = len(SIZE_STRING)
size_string = thread_type_size[thread_type_size.find(SIZE_STRING) + SIZE_STRING_LEN:]
size_string = size_string[:size_string.find(",")]
return int(size_string)
def get_top_and_weight(index):
thread_type_size = self.definition(int(tokens[0]))
size = get_allocation_size(thread_type_size)
if self.args.type_only:
thread_type_size = get_allocation_type(thread_type_size)
elif self.args.thread_only:
thread_type_size = get_allocation_thread(thread_type_size)
return (thread_type_size, size)
tokens = definition.split(";")
# The first element (base) of the stack trace is the thread/type/size.
# Get the weight (either 1 or the number of bytes allocated).
(thread_type_size, weight) = get_top_and_weight(int(tokens[0]))
self.set_weight(index, weight)
# Remove the thread/type/size from the base of the stack trace.
del tokens[0]
# Build the stack trace list.
expanded_definition = ""
for i in range(len(tokens)):
if self.args.depth_limit > 0 and i >= self.args.depth_limit:
break
token = tokens[i]
# Replace semicolons by colons in the method entry signatures.
method = self.definition(int(token)).replace(";", ":")
if len(expanded_definition) > 0:
expanded_definition += ";"
expanded_definition += method
if not self.args.ignore_type:
# Add the thread/type/size as the top-most stack frame.
if len(expanded_definition) > 0:
expanded_definition += ";"
expanded_definition += thread_type_size.replace(";", ":")
if self.args.reverse_stack:
def_list = expanded_definition.split(";")
expanded_definition = ";".join(def_list[::-1])
return expanded_definition
# If the line contains a comma, it is of the form [+=]index,definition,
# where index is a string containing an integer, and definition is the
# value represented by the integer whenever it is used later.
# * Lines starting with + are either a thread/type/size record or a single
# stack frame. These are simply interned in the table.
# * Those starting with = are stack traces, and contain a sequence of
# numbers separated by semicolon. These are "expanded" and then interned.
comma_pos = line.find(",")
index = int(line[1:comma_pos])
definition = line[comma_pos+1:]
if line[0:1] == "=":
definition = expand_stack_trace(definition)
# Intern the definition in the table.
#if len(definition) == 0:
# Zero length samples are errors and are discarded.
#print("ERROR: definition for " + str(index) + " is empty")
#return
self.set_definition(index, definition)
def process_trace(index):
"""
Remembers one stack trace in the list of stack traces we have seen.
Remembering a stack trace increments a count associated with the trace.
"""
trace = self.definition(index)
if self.args.use_size:
weight = self.weight(index)
else:
weight = 1
if trace in self.allocation_count:
self.allocation_count[trace] = self.allocation_count[trace] + weight
else:
self.allocation_count[trace] = weight
# Read the file, processing each line as a definition or stack trace.
tracefile = open(filename, "r")
current_allocation_trace = ""
for line in tracefile:
line = line.rstrip("\n")
if line[0:1] == "=" or line[0:1] == "+":
# definition.
process_definition(line)
else:
# stack trace.
process_trace(int(line))
def dump_flame_graph(self):
"""
Prints out a stack trace format compatible with flame graph creation utilities.
"""
for definition, weight in self.allocation_count.items():
print(definition + " " + str(weight))
def parse_options():
parser = argparse.ArgumentParser(description="Convert a trace to a form usable for flame graphs.")
parser.add_argument("filename", help="The trace file as input", type=str)
parser.add_argument("--use_size", help="Count by allocation size", action="store_true",
default=False)
parser.add_argument("--ignore_type", help="Ignore type of allocation", action="store_true",
default=False)
parser.add_argument("--reverse_stack", help="Reverse root and top of stacks", action="store_true",
default=False)
parser.add_argument("--type_only", help="Only consider allocation type", action="store_true",
default=False)
parser.add_argument("--thread_only", help="Only consider allocation thread", action="store_true",
default=False)
parser.add_argument("--depth_limit", help="Limit the length of a trace", type=int, default=0)
args = parser.parse_args()
return args
def main(argv):
args = parse_options()
trace_collection = TraceCollection(args)
trace_collection.read_file(args.filename)
trace_collection.dump_flame_graph()
if __name__ == '__main__':
sys.exit(main(sys.argv))
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