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#!/usr/bin/env python
# Copyright 2017 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Wrapper script for verify-predictable mode. D8 is expected to be compiled with
v8_enable_verify_predictable.
The actual test command is expected to be passed to this wraper as is. E.g.:
predictable_wrapper.py path/to/d8 --test --predictable --flag1 --flag2
The command is run up to three times and the printed allocation hash is
compared. Differences are reported as errors.
"""
import sys
from testrunner.local import command
MAX_TRIES = 3
def main(args):
def allocation_str(stdout):
for line in reversed((stdout or '').splitlines()):
if line.startswith('### Allocations = '):
return line
return None
cmd = command.Command(args[0], args[1:])
previous_allocations = None
for run in range(1, MAX_TRIES + 1):
print '### Predictable run #%d' % run
output = cmd.execute()
if output.stdout:
print '### Stdout:'
print output.stdout
if output.stderr:
print '### Stderr:'
print output.stderr
print '### Return code: %s' % output.exit_code
if output.HasTimedOut():
# If we get a timeout in any run, we are in an unpredictable state. Just
# report it as a failure and don't rerun.
print '### Test timed out'
return 1
allocations = allocation_str(output.stdout)
if not allocations:
print ('### Test had no allocation output. Ensure this is built '
'with v8_enable_verify_predictable and that '
'--verify-predictable is passed at the cmd line.')
return 2
if previous_allocations and previous_allocations != allocations:
print '### Allocations differ'
return 3
if run >= MAX_TRIES:
# No difference on the last run -> report a success.
return 0
previous_allocations = allocations
# Unreachable.
assert False
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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