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#!/usr/bin/env python
"""
A gdb-compatible frontend for lldb that implements just enough
commands to run the tests in the debuginfo-tests repository with lldb.
"""
# ----------------------------------------------------------------------
# Auto-detect lldb python module.
import commands, platform, os, sys
try:
# Just try for LLDB in case PYTHONPATH is already correctly setup.
import lldb
except ImportError:
lldb_python_dirs = list()
# lldb is not in the PYTHONPATH, try some defaults for the current platform.
platform_system = platform.system()
if platform_system == 'Darwin':
# On Darwin, try the currently selected Xcode directory
xcode_dir = commands.getoutput("xcode-select --print-path")
if xcode_dir:
lldb_python_dirs.append(os.path.realpath(xcode_dir +
'/../SharedFrameworks/LLDB.framework/Resources/Python'))
lldb_python_dirs.append(xcode_dir +
'/Library/PrivateFrameworks/LLDB.framework/Resources/Python')
lldb_python_dirs.append(
'/System/Library/PrivateFrameworks/LLDB.framework/Resources/Python')
success = False
for lldb_python_dir in lldb_python_dirs:
if os.path.exists(lldb_python_dir):
if not (sys.path.__contains__(lldb_python_dir)):
sys.path.append(lldb_python_dir)
try:
import lldb
except ImportError:
pass
else:
print 'imported lldb from: "%s"' % (lldb_python_dir)
success = True
break
if not success:
print "error: couldn't locate the 'lldb' module, please set PYTHONPATH correctly"
sys.exit(1)
# ----------------------------------------------------------------------
# Command line option handling.
import argparse
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--quiet', '-q', action="store_true", help='ignored')
parser.add_argument('-batch', action="store_true",
help='exit after processing comand line')
parser.add_argument('-n', action="store_true", help='ignore .lldb file')
parser.add_argument('-x', dest='script', type=file, help='execute commands from file')
parser.add_argument("target", help="the program to debug")
args = parser.parse_args()
# Create a new debugger instance.
debugger = lldb.SBDebugger.Create()
debugger.SkipLLDBInitFiles(args.n)
# Make sure to clean up the debugger on exit.
import atexit
def on_exit():
debugger.Terminate()
atexit.register(on_exit)
# Don't return from lldb function calls until the process stops.
debugger.SetAsync(False)
# Create a target from a file and arch.
arch = os.popen("file "+args.target).read().split()[-1]
target = debugger.CreateTargetWithFileAndArch(args.target, arch)
if not target:
print "Could not create target", args.target
sys.exit(1)
if not args.script:
print "Interactive mode is not implemented."
sys.exit(1)
import re
for command in args.script:
# Strip newline and whitespaces and split into words.
cmd = command[:-1].strip().split()
if not cmd:
continue
print '> %s'% command[:-1]
try:
if re.match('^r|(run)$', cmd[0]):
error = lldb.SBError()
launchinfo = lldb.SBLaunchInfo([])
launchinfo.SetWorkingDirectory(os.getcwd())
process = target.Launch(launchinfo, error)
print error
if not process or error.fail:
state = process.GetState()
print "State = %d" % state
print """
ERROR: Could not launch process.
NOTE: There are several reasons why this may happen:
* Root needs to run "DevToolsSecurity --enable".
* Older versions of lldb cannot launch more than one process simultaneously.
"""
sys.exit(1)
elif re.match('^b|(break)$', cmd[0]) and len(cmd) == 2:
if re.match('[0-9]+', cmd[1]):
# b line
mainfile = target.FindFunctions('main')[0].compile_unit.file
print target.BreakpointCreateByLocation(mainfile, int(cmd[1]))
else:
# b file:line
file, line = cmd[1].split(':')
print target.BreakpointCreateByLocation(file, int(line))
elif re.match('^ptype$', cmd[0]) and len(cmd) == 2:
# GDB's ptype has multiple incarnations depending on its
# argument (global variable, function, type). The definition
# here is for looking up the signature of a function and only
# if that fails it looks for a type with that name.
# Type lookup in LLDB would be "image lookup --type".
for elem in target.FindFunctions(cmd[1]):
print elem.function.type
continue
print target.FindFirstType(cmd[1])
elif re.match('^po$', cmd[0]) and len(cmd) > 1:
try:
opts = lldb.SBExpressionOptions()
opts.SetFetchDynamicValue(True)
opts.SetCoerceResultToId(True)
print target.EvaluateExpression(' '.join(cmd[1:]), opts)
except:
# FIXME: This is a fallback path for the lab.llvm.org
# buildbot running OS X 10.7; it should be removed.
thread = process.GetThreadAtIndex(0)
frame = thread.GetFrameAtIndex(0)
print frame.EvaluateExpression(' '.join(cmd[1:]))
elif re.match('^p|(print)$', cmd[0]) and len(cmd) > 1:
thread = process.GetThreadAtIndex(0)
frame = thread.GetFrameAtIndex(0)
print frame.EvaluateExpression(' '.join(cmd[1:]))
elif re.match('^n|(next)$', cmd[0]):
thread = process.GetThreadAtIndex(0)
thread.StepOver()
elif re.match('^q|(quit)$', cmd[0]):
sys.exit(0)
else:
print debugger.HandleCommand(' '.join(cmd))
except SystemExit:
raise
except:
print 'Could not handle the command "%s"' % ' '.join(cmd)
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