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#!/usr/bin/python
# ---------------------------------------------------------------------
# Be sure to add the python path that points to the LLDB shared library.
#
# # To use this in the embedded python interpreter using "lldb" just
# import it with the full path using the "command script import"
# command
# (lldb) command script import /path/to/cmdtemplate.py
# ---------------------------------------------------------------------
from __future__ import print_function
import inspect
import lldb
import optparse
import shlex
import sys
class FrameStatCommand:
program = 'framestats'
@classmethod
def register_lldb_command(cls, debugger, module_name):
parser = cls.create_options()
cls.__doc__ = parser.format_help()
# Add any commands contained in this module to LLDB
command = 'command script add -c %s.%s %s' % (module_name,
cls.__name__,
cls.program)
debugger.HandleCommand(command)
print('The "{0}" command has been installed, type "help {0}" or "{0} '
'--help" for detailed help.'.format(cls.program))
@classmethod
def create_options(cls):
usage = "usage: %prog [options]"
description = ('This command is meant to be an example of how to make '
'an LLDB command that does something useful, follows '
'best practices, and exploits the SB API. '
'Specifically, this command computes the aggregate '
'and average size of the variables in the current '
'frame and allows you to tweak exactly which variables '
'are to be accounted in the computation.')
# Pass add_help_option = False, since this keeps the command in line
# with lldb commands, and we wire up "help command" to work by
# providing the long & short help methods below.
parser = optparse.OptionParser(
description=description,
prog=cls.program,
usage=usage,
add_help_option=False)
parser.add_option(
'-i',
'--in-scope',
action='store_true',
dest='inscope',
help='in_scope_only = True',
default=True)
parser.add_option(
'-a',
'--arguments',
action='store_true',
dest='arguments',
help='arguments = True',
default=True)
parser.add_option(
'-l',
'--locals',
action='store_true',
dest='locals',
help='locals = True',
default=True)
parser.add_option(
'-s',
'--statics',
action='store_true',
dest='statics',
help='statics = True',
default=True)
return parser
def get_short_help(self):
return "Example command for use in debugging"
def get_long_help(self):
return self.help_string
def __init__(self, debugger, unused):
self.parser = self.create_options()
self.help_string = self.parser.format_help()
def __call__(self, debugger, command, exe_ctx, result):
# Use the Shell Lexer to properly parse up command options just like a
# shell would
command_args = shlex.split(command)
try:
(options, args) = self.parser.parse_args(command_args)
except:
# if you don't handle exceptions, passing an incorrect argument to
# the OptionParser will cause LLDB to exit (courtesy of OptParse
# dealing with argument errors by throwing SystemExit)
result.SetError("option parsing failed")
return
# Always get program state from the lldb.SBExecutionContext passed
# in as exe_ctx
frame = exe_ctx.GetFrame()
if not frame.IsValid():
result.SetError("invalid frame")
return
variables_list = frame.GetVariables(
options.arguments,
options.locals,
options.statics,
options.inscope)
variables_count = variables_list.GetSize()
if variables_count == 0:
print("no variables here", file=result)
return
total_size = 0
for i in range(0, variables_count):
variable = variables_list.GetValueAtIndex(i)
variable_type = variable.GetType()
total_size = total_size + variable_type.GetByteSize()
average_size = float(total_size) / variables_count
print("Your frame has %d variables. Their total size "
"is %d bytes. The average size is %f bytes" % (
variables_count, total_size, average_size), file=result)
# not returning anything is akin to returning success
def __lldb_init_module(debugger, dict):
# Register all classes that have a register_lldb_command method
for _name, cls in inspect.getmembers(sys.modules[__name__]):
if inspect.isclass(cls) and callable(getattr(cls,
"register_lldb_command",
None)):
cls.register_lldb_command(debugger, __name__)
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