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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
import sys
import os
import platform
from dex.debugger.DebuggerBase import DebuggerBase
from dex.dextIR import FrameIR, LocIR, StepIR, StopReason, ValueIR
from dex.dextIR import ProgramState, StackFrame, SourceLocation
from dex.utils.Exceptions import DebuggerException, LoadDebuggerException
from dex.utils.ReturnCode import ReturnCode
if platform.system() == "Windows":
# Don't load on linux; _load_interface will croak before any names are used.
from . import setup
from . import probe_process
from . import breakpoint
class DbgEng(DebuggerBase):
def __init__(self, context, *args):
self.breakpoints = []
self.running = False
self.finished = False
self.step_info = None
super(DbgEng, self).__init__(context, *args)
def _custom_init(self):
try:
res = setup.setup_everything(self.context.options.executable)
self.client, self.hProcess = res
self.running = True
except Exception as e:
raise Exception('Failed to start debuggee: {}'.format(e))
def _custom_exit(self):
setup.cleanup(self.client, self.hProcess)
def _load_interface(self):
arch = platform.architecture()[0]
machine = platform.machine()
if arch == '32bit' and machine == 'AMD64':
# This python process is 32 bits, but is sitting on a 64 bit machine.
# Bad things may happen, don't support it.
raise LoadDebuggerException('Can\'t run Dexter dbgeng on 32 bit python in a 64 bit environment')
if platform.system() != 'Windows':
raise LoadDebuggerException('DbgEng supports Windows only')
# Otherwise, everything was imported earlier
@classmethod
def get_name(cls):
return 'dbgeng'
@classmethod
def get_option_name(cls):
return 'dbgeng'
@property
def frames_below_main(self):
return []
@property
def version(self):
# I don't believe there's a well defined DbgEng version, outside of the
# version of Windows being used.
return "1"
def clear_breakpoints(self):
for x in self.breakpoints:
x.RemoveFlags(breakpoint.BreakpointFlags.DEBUG_BREAKPOINT_ENABLED)
self.client.Control.RemoveBreakpoint(x)
def add_breakpoint(self, file_, line):
# This is something to implement in the future -- as it stands, Dexter
# doesn't test for such things as "I can set a breakpoint on this line".
# This is only called AFAICT right now to ensure we break on every step.
pass
def launch(self):
# We are, by this point, already launched.
self.step_info = probe_process.probe_state(self.client)
def step(self):
res = setup.step_once(self.client)
if not res:
self.finished = True
self.step_info = res
def go(self):
# We never go -- we always single step.
pass
def get_step_info(self):
frames = self.step_info
state_frames = []
# For now assume the base function is the... function, ignoring
# inlining.
dex_frames = []
for i, x in enumerate(frames):
# XXX Might be able to get columns out through
# GetSourceEntriesByOffset, not a priority now
loc = LocIR(path=x.source_file, lineno=x.line_no, column=0)
new_frame = FrameIR(function=x.function_name, is_inlined=False, loc=loc)
dex_frames.append(new_frame)
state_frame = StackFrame(function=new_frame.function,
is_inlined=new_frame.is_inlined,
location=SourceLocation(path=x.source_file,
lineno=x.line_no,
column=0),
watches={})
for expr in map(
lambda watch, idx=i: self.evaluate_expression(watch, idx),
self.watches):
state_frame.watches[expr.expression] = expr
state_frames.append(state_frame)
return StepIR(
step_index=self.step_index, frames=dex_frames,
stop_reason=StopReason.STEP,
program_state=ProgramState(state_frames))
@property
def is_running(self):
return False # We're never free-running
@property
def is_finished(self):
return self.finished
def evaluate_expression(self, expression, frame_idx=0):
# XXX: cdb insists on using '->' to examine fields of structures,
# as it appears to reserve '.' for other purposes.
fixed_expr = expression.replace('.', '->')
orig_scope_idx = self.client.Symbols.GetCurrentScopeFrameIndex()
self.client.Symbols.SetScopeFrameByIndex(frame_idx)
res = self.client.Control.Evaluate(fixed_expr)
if res is not None:
result, typename = self.client.Control.Evaluate(fixed_expr)
could_eval = True
else:
result, typename = (None, None)
could_eval = False
self.client.Symbols.SetScopeFrameByIndex(orig_scope_idx)
return ValueIR(
expression=expression,
value=str(result),
type_name=typename,
error_string="",
could_evaluate=could_eval,
is_optimized_away=False,
is_irretrievable=not could_eval)
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