torch-mlir/python/npcomp/utils/test_utils.py

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2020-04-27 06:50:23 +08:00
# 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
import contextlib
import io
import os
import subprocess
import sys
_disable_var = "NPCOMP_DISABLE_FILECHECK"
_filecheck_binary_var = "FILECHECK_BINARY"
def is_filecheck_disabled():
return _disable_var in os.environ
def start_filecheck_test():
if is_filecheck_disabled():
print("WARNING:FileCheck disabled due to", _disable_var,
"in the environment", file=sys.stderr)
return
global _redirect_io
global _redirect_context
_redirect_io = io.StringIO()
_redirect_context = contextlib.redirect_stdout(_redirect_io)
_redirect_context.__enter__()
def end_filecheck_test(main_file):
if is_filecheck_disabled(): return
global _redirect_io
global _redirect_context
_redirect_context.__exit__(None, None, None)
_redirect_context = None
_redirect_io.flush()
filecheck_input = _redirect_io.getvalue()
_redirect_io = None
filecheck_binary = "FileCheck"
if _filecheck_binary_var in os.environ:
filecheck_binary = os.environ[_filecheck_binary_var]
print("Using FileCheck binary", filecheck_binary,
"(customize by setting", _filecheck_binary_var, ")", file=sys.stderr)
filecheck_args = [filecheck_binary, main_file, "--dump-input=fail"]
print("LAUNCHING FILECHECK:", filecheck_args, file=sys.stderr)
p = subprocess.Popen(filecheck_args, stdin=subprocess.PIPE)
p.communicate(filecheck_input.encode("UTF-8"))
sys.exit(p.returncode)
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def run_under_filecheck(main_file, callback, disable_filecheck=False):
"""Runs a callback under a FileCheck sub-process.
This is typically called from a main context and will sys.exit on
completion.
Args:
main_file: The file to process filecheck directives on. Typically
__file__ from the caller's perspective.
callback: The no-argument callback to invoke.
disable_filecheck: Whether to disable filecheck.
"""
if disable_filecheck or is_filecheck_disabled():
print("WARNING:FileCheck disabled due to", _disable_var,
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"in the environment", file=sys.stderr)
callback()
sys.exit(0)
try:
start_filecheck_test()
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callback()
finally:
end_filecheck_test(main_file)