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#!/usr/bin/env python3
# ===- lib/fuzzer/scripts/unbalanced_allocs.py ------------------------------===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
# ===------------------------------------------------------------------------===#
#
# Post-process -trace_malloc=2 output and printout only allocations and frees
# unbalanced inside of fuzzer runs.
# Usage:
# my_fuzzer -trace_malloc=2 -runs=10 2>&1 | unbalanced_allocs.py -skip=5
#
# ===------------------------------------------------------------------------===#
import argparse
import sys
_skip = 0
def PrintStack(line, stack):
global _skip
if _skip > 0:
return
print("Unbalanced " + line.rstrip())
for l in stack:
print(l.rstrip())
def ProcessStack(line, f):
stack = []
while line and line.startswith(" #"):
stack += [line]
line = f.readline()
return line, stack
def ProcessFree(line, f, allocs):
if not line.startswith("FREE["):
return f.readline()
addr = int(line.split()[1], 16)
next_line, stack = ProcessStack(f.readline(), f)
if addr in allocs:
del allocs[addr]
else:
PrintStack(line, stack)
return next_line
def ProcessMalloc(line, f, allocs):
if not line.startswith("MALLOC["):
return ProcessFree(line, f, allocs)
addr = int(line.split()[1], 16)
assert not addr in allocs
next_line, stack = ProcessStack(f.readline(), f)
allocs[addr] = (line, stack)
return next_line
def ProcessRun(line, f):
if not line.startswith("MallocFreeTracer: START"):
return ProcessMalloc(line, f, {})
allocs = {}
print(line.rstrip())
line = f.readline()
while line:
if line.startswith("MallocFreeTracer: STOP"):
global _skip
_skip = _skip - 1
for _, (l, s) in allocs.items():
PrintStack(l, s)
print(line.rstrip())
return f.readline()
line = ProcessMalloc(line, f, allocs)
return line
def ProcessFile(f):
line = f.readline()
while line:
line = ProcessRun(line, f)
def main(argv):
parser = argparse.ArgumentParser()
parser.add_argument("--skip", default=0, help="number of runs to ignore")
args = parser.parse_args()
global _skip
_skip = int(args.skip) + 1
ProcessFile(sys.stdin)
if __name__ == "__main__":
main(sys.argv)
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