为了解决 Apple 的lldb (rdar://13702081) 中的错误,我经常需要依次键入两个命令,如下所示:
(lldb) p todo.matA
(vMAT_Array *) $2 = 0x000000010400b5a0
(lldb) po $2.dump
$3 = 0x0000000100503ce0 <vMAT_Int8Array: 0x10400b5a0; size: [9 1]> =
1
1
1
1
1
1
1
1
1
是否可以使用可以为我组合这些步骤的 Python 库(或其他东西)编写新的lldb命令?理想情况下是这样的:
(lldb) pmat todo
$3 = 0x0000000100503ce0 <vMAT_Int8Array: 0x10400b5a0; size: [9 1]> =
1
1
1
1
1
1
1
1
1
解决方案
感谢 Jason Molenda,这里是工作lldb命令脚本的输出:
(lldb) pmat Z
$0 = 0x0000000100112920 <vMAT_DoubleArray: 0x101880c20; size: [9 3]> =
7 9 0.848715
3 5 0.993378
0 1 1.11738
4 12 1.2013
11 13 1.20193
6 10 1.29206
14 15 1.53283
8 16 1.53602
2 17 1.68116
我确实不得不稍微调整下面答案中提供的脚本,使用 Jason 的建议来解决带有过于复杂的表达式的lldb错误。这是我的最终脚本:
# import this into lldb with a command like
# command script import pmat.py
import lldb
import shlex
import optparse
def pmat(debugger, command, result, dict):
# Use the Shell Lexer to properly parse up command options just like a
# shell would
command_args = shlex.split(command)
parser = create_pmat_options()
try:
(options, args) = parser.parse_args(command_args)
except:
return
target = debugger.GetSelectedTarget()
if target:
process = target.GetProcess()
if process:
frame = process.GetSelectedThread().GetSelectedFrame()
if frame:
var = frame.FindVariable(args[0])
if var:
array = var.GetChildMemberWithName("matA")
if array:
id = array.GetValueAsUnsigned (lldb.LLDB_INVALID_ADDRESS)
if id != lldb.LLDB_INVALID_ADDRESS:
debugger.HandleCommand ('po [0x%x dump]' % id)
def create_pmat_options():
usage = "usage: %prog"
description='''Print a dump of a vMAT_Array instance.'''
parser = optparse.OptionParser(description=description, prog='pmat',usage=usage)
return parser
#
# code that runs when this script is imported into LLDB
#
def __lldb_init_module (debugger, dict):
# This initializer is being run from LLDB in the embedded command interpreter
# Make the options so we can generate the help text for the new LLDB
# command line command prior to registering it with LLDB below
# add pmat
parser = create_pmat_options()
pmat.__doc__ = parser.format_help()
# Add any commands contained in this module to LLDB
debugger.HandleCommand('command script add -f %s.pmat pmat' % __name__)