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# 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
"""Default class for controlling debuggers."""
from itertools import chain
import os
import time
from dex.debugger.DebuggerControllers.DebuggerControllerBase import (
DebuggerControllerBase,
)
from dex.debugger.DebuggerControllers.ControllerHelpers import (
in_source_file,
update_step_watches,
)
from dex.utils.Exceptions import DebuggerException, LoadDebuggerException
from dex.utils.Timeout import Timeout
class EarlyExitCondition(object):
def __init__(self, on_line, hit_count, expression, values):
self.on_line = on_line
self.hit_count = hit_count
self.expression = expression
self.values = values
class DefaultController(DebuggerControllerBase):
def __init__(self, context, step_collection):
self.source_files = context.options.source_files
self.watches = set()
self.step_index = 0
super(DefaultController, self).__init__(context, step_collection)
def _break_point_all_lines(self):
for s in self.context.options.source_files:
with open(s, "r") as fp:
num_lines = len(fp.readlines())
for line in range(1, num_lines + 1):
try:
self.debugger.add_breakpoint(s, line)
except DebuggerException:
raise LoadDebuggerException(DebuggerException.msg)
def _get_early_exit_conditions(self):
commands = self.step_collection.commands
early_exit_conditions = []
if "DexFinishTest" in commands:
finish_commands = commands["DexFinishTest"]
for fc in finish_commands:
condition = EarlyExitCondition(
on_line=fc.on_line,
hit_count=fc.hit_count,
expression=fc.expression,
values=fc.values,
)
early_exit_conditions.append(condition)
return early_exit_conditions
def _should_exit(self, early_exit_conditions, line_no):
for condition in early_exit_conditions:
if condition.on_line == line_no:
exit_condition_hit = condition.expression is None
if condition.expression is not None:
# For the purposes of consistent behaviour with the
# Conditional Controller, check equality in the debugger
# rather than in python (as the two can differ).
for value in condition.values:
expr_val = self.debugger.evaluate_expression(
f"({condition.expression}) == ({value})"
)
if expr_val.value == "true":
exit_condition_hit = True
break
if exit_condition_hit:
if condition.hit_count <= 0:
return True
else:
condition.hit_count -= 1
return False
def _run_debugger_custom(self, cmdline):
self.step_collection.debugger = self.debugger.debugger_info
self._break_point_all_lines()
self.debugger.launch(cmdline)
for command_obj in chain.from_iterable(self.step_collection.commands.values()):
self.watches.update(command_obj.get_watches())
early_exit_conditions = self._get_early_exit_conditions()
timed_out = False
total_timeout = Timeout(self.context.options.timeout_total)
max_steps = self.context.options.max_steps
for _ in range(max_steps):
breakpoint_timeout = Timeout(self.context.options.timeout_breakpoint)
while self.debugger.is_running and not timed_out:
# Check to see whether we've timed out while we're waiting.
if total_timeout.timed_out():
self.context.logger.error(
"Debugger session has been "
f"running for {total_timeout.elapsed}s, timeout reached!"
)
timed_out = True
if breakpoint_timeout.timed_out():
self.context.logger.error(
f"Debugger session has not "
f"hit a breakpoint for {breakpoint_timeout.elapsed}s, timeout "
"reached!"
)
timed_out = True
if timed_out or self.debugger.is_finished:
break
self.step_index += 1
step_info = self.debugger.get_step_info(self.watches, self.step_index)
if step_info.current_frame:
update_step_watches(
step_info, self.watches, self.step_collection.commands
)
self.step_collection.new_step(self.context, step_info)
if self._should_exit(
early_exit_conditions, step_info.current_frame.loc.lineno
):
break
if in_source_file(self.source_files, step_info):
self.debugger.step()
else:
self.debugger.go()
time.sleep(self.context.options.pause_between_steps)
else:
raise DebuggerException(
"maximum number of steps reached ({})".format(max_steps)
)
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