# DExTer : Debugging Experience Tester
# ~~~~~~ ~ ~~ ~ ~~
#
# 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
"""This is the main entry point.
It implements some functionality common to all subtools such as command line
parsing and running the unit-testing harnesses, before calling the reequested
subtool.
"""
import imp
import os
import sys
from dex.utils import PrettyOutput, Timer
from dex.utils import ExtArgParse as argparse
from dex.utils import get_root_directory
from dex.utils.Exceptions import Error, ToolArgumentError
from dex.utils.Logging import Logger
from dex.utils.UnitTests import unit_tests_ok
from dex.utils.Version import version
from dex.utils import WorkingDirectory
from dex.utils.ReturnCode import ReturnCode
def _output_bug_report_message(context):
"""In the event of a catastrophic failure, print bug report request to the
user.
"""
context.o.red(
"\n\n"
"<g>****************************************</>\n"
"<b>****************************************</>\n"
"****************************************\n"
"** **\n"
"** <y>This is a bug in <a>DExTer</>.</> **\n"
"** **\n"
"** <y>Please report it.</> **\n"
"** **\n"
"****************************************\n"
"<b>****************************************</>\n"
"<g>****************************************</>\n"
"\n"
"<b>system:</>\n"
"<d>{}</>\n\n"
"<b>version:</>\n"
"<d>{}</>\n\n"
"<b>args:</>\n"
"<d>{}</>\n"
"\n".format(sys.platform, version("DExTer"), [sys.executable] + sys.argv),
stream=PrettyOutput.stderr,
)
def get_tools_directory():
"""Returns directory path where DExTer tool imports can be
found.
"""
tools_directory = os.path.join(get_root_directory(), "tools")
assert os.path.isdir(tools_directory), tools_directory
return tools_directory
def get_tool_names():
"""Returns a list of expected DExTer Tools"""
return [
"help",
"list-debuggers",
"no-tool-",
"run-debugger-internal-",
"test",
"view",
]
def _set_auto_highlights(context):
"""Flag some strings for auto-highlighting."""
context.o.auto_reds.extend(
[
r"[Ee]rror\:",
r"[Ee]xception\:",
r"un(expected|recognized) argument",
]
)
context.o.auto_yellows.extend(
[
r"[Ww]arning\:",
r"\(did you mean ",
r"During handling of the above exception, another exception",
]
)
def _get_options_and_args(context):
"""get the options and arguments from the commandline"""
parser = argparse.ExtArgumentParser(context, add_help=False)
parser.add_argument("tool", default=None, nargs="?")
options, args = parser.parse_known_args(sys.argv[1:])
return options, args
def _get_tool_name(options):
"""get the name of the dexter tool (if passed) specified on the command
line, otherwise return 'no_tool_'.
"""
tool_name = options.tool
if tool_name is None:
tool_name = "no_tool_"
else:
_is_valid_tool_name(tool_name)
return tool_name
def _is_valid_tool_name(tool_name):
"""check tool name matches a tool directory within the dexter tools
directory.
"""
valid_tools = get_tool_names()
if tool_name not in valid_tools:
raise Error(
'invalid tool "{}" (choose from {})'.format(
tool_name, ", ".join([t for t in valid_tools if not t.endswith("-")])
)
)
def _import_tool_module(tool_name):
"""Imports the python module at the tool directory specificed by
tool_name.
"""
# format tool argument to reflect tool directory form.
tool_name = tool_name.replace("-", "_")
tools_directory = get_tools_directory()
module_info = imp.find_module(tool_name, [tools_directory])
return imp.load_module(tool_name, *module_info)
def tool_main(context, tool, args):
with Timer(tool.name):
options, defaults = tool.parse_command_line(args)
Timer.display = options.time_report
Timer.indent = options.indent_timer_level
Timer.fn = context.o.blue
context.options = options
context.version = version(tool.name)
if options.version:
context.o.green("{}\n".format(context.version))
return ReturnCode.OK
if options.verbose:
context.logger.verbosity = 2
elif options.no_warnings:
context.logger.verbosity = 0
if options.unittest != "off" and not unit_tests_ok(context):
raise Error("<d>unit test failures</>")
if options.colortest:
context.o.colortest()
return ReturnCode.OK
try:
tool.handle_base_options(defaults)
except ToolArgumentError as e:
raise Error(e)
dir_ = context.options.working_directory
with WorkingDirectory(context, dir=dir_) as context.working_directory:
return_code = tool.go()
return return_code
class Context(object):
"""Context encapsulates globally useful objects and data; passed to many
Dexter functions.
"""
def __init__(self):
self.o: PrettyOutput = None
self.logger: Logger = None
self.working_directory: str = None
self.options: dict = None
self.version: str = None
self.root_directory: str = None
def main() -> ReturnCode:
context = Context()
with PrettyOutput() as context.o:
context.logger = Logger(context.o)
try:
context.root_directory = get_root_directory()
# Flag some strings for auto-highlighting.
_set_auto_highlights(context)
options, args = _get_options_and_args(context)
# raises 'Error' if command line tool is invalid.
tool_name = _get_tool_name(options)
module = _import_tool_module(tool_name)
return tool_main(context, module.Tool(context), args)
except Error as e:
context.logger.error(str(e))
try:
if context.options.error_debug:
raise
except AttributeError:
pass
return ReturnCode._ERROR
except (KeyboardInterrupt, SystemExit):
raise
except: # noqa
_output_bug_report_message(context)
raise
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