使用方法
- 复制安装命令，在自己的智能体环境安装前先检查源码包。
- 从原始文档核对所需工具、凭据和支持的宿主。
- 说明输入材料与期望交付物，并对照来源检查输出。
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill lldb开始前需了解
- 安装不包含模型订阅、API 额度或访问文件的权限。
- 仓库星数和安装量反映活跃情况，不等于独立质量或安全测试。
仓库原始内容
按源仓库内容呈现，保留标题、案例、代码、表格、链接以及原文引用的演示图片。
LLDB
Purpose
Guide agents through LLDB sessions and map existing GDB knowledge to LLDB. Covers command differences, Apple specifics, Python scripting, and IDE integration.
Triggers
- "I'm on macOS and need to debug a C++ program"
- "How does LLDB differ from GDB?"
- "How do I do [GDB command] in LLDB?"
- "LLDB shows
<unavailable>for variables" - "How do I use LLDB in VS Code?"
- "How do I write an LLDB Python script?"
Workflow
1. Start LLDB
bash
lldb ./prog # load binary
lldb ./prog -- arg1 arg2 # with arguments
lldb -p 12345 # attach to PID
lldb -c core.1234 # load core dump
lldb ./prog core.1234 # binary + core2. GDB → LLDB command map
Source: <https://lldb.llvm.org/use/map.html>
| GDB | LLDB | Notes |
|---|---|---|
run [args] | process launch [args] / r | |
continue | process continue / c | |
next | thread step-over / n | |
step | thread step-in / s | |
nexti | thread step-inst-over / ni | |
stepi | thread step-inst / si | |
finish | thread step-out / finish | |
break main | breakpoint set -n main / b main | |
break file.c:42 | breakpoint set -f file.c -l 42 / b file.c:42 | |
break *0x400abc | breakpoint set -a 0x400abc / b -a 0x400abc | |
watch x | watchpoint set variable x / wa s v x | |
print x | frame variable x / p x | |
print/x x | p/x x | |
info locals | frame variable / fr v | |
info args | frame variable --arguments | |
backtrace | thread backtrace / bt | |
frame N | frame select N / f N | |
info threads | thread list | |
thread N | thread select N | |
thread apply all bt | thread backtrace all | |
x/10wx addr | memory read -s4 -fx -c10 addr / x/10xw addr | |
set var = 42 | expression var = 42 / expr var = 42 | |
quit | quit / q |
3. Breakpoints
lldb
# By name
b main
breakpoint set --name foo
breakpoint set --name foo --condition 'x > 0'
# By file:line
b file.c:42
breakpoint set --file file.c --line 42
# By address
b -a 0x100003f20
# By regex
breakpoint set --func-regex '^MyClass::'
# List
breakpoint list / br l
# Delete
breakpoint delete 2
# Disable/enable
breakpoint disable 1
breakpoint enable 1
# Commands on hit
breakpoint command add 1
> p x
> continue
> DONE4. Inspect state
lldb
# Print variable
p x
frame variable x
p *ptr
p arr[0]
# Print expression
expression x * 2 + 1
expr (int)sqrt(9.0)
# All locals
frame variable
fr v -a # include arguments
# Registers
register read
register read rip rsp
# Memory
memory read --size 4 --format x --count 10 0x7fff0000
x/10xw 0x7fff0000 # GDB-compatible syntax
# Type info
image lookup --type MyClass
type lookup MyClass5. Watchpoints
lldb
watchpoint set variable x # write watchpoint
watchpoint set variable -w read x # read watchpoint
watchpoint set variable -w read_write x
watchpoint set expression -- &x # by address
watchpoint list
watchpoint delete 16. Threads
lldb
thread list
thread select 3
thread backtrace all
thread backtrace --count 5 # limit depth
# Per-thread stepping
thread step-over # step this thread only7. macOS / Apple specifics
lldb
# Symbol lookup in shared cache
image lookup --address 0x18ab12345
image lookup --name objc_msgSend
# Objective-C method breakpoint
b "-[NSArray objectAtIndex:]"
b "+[NSString stringWithFormat:]"
# Inspect Objective-C object
po myObject # print-object (calls -description)
po [arr count]
# Show loaded libraries
image list
image list -b # brief (names only)8. VS Code integration
Install the CodeLLDB extension. .vscode/launch.json:
json
{
"version": "0.2.0",
"configurations": [
{
"name": "Debug (lldb)",
"type": "lldb",
"request": "launch",
"program": "${workspaceFolder}/build/prog",
"args": [],
"cwd": "${workspaceFolder}",
"preLaunchTask": "build"
}
]
}9. LLDB Python scripting
python
import lldb
def print_all_threads(debugger, command, result, internal_dict):
target = debugger.GetSelectedTarget()
process = target.GetProcess()
for thread in process:
print(f"Thread {thread.GetIndexID()}: {thread.GetName()}")
for frame in thread:
print(f" {frame}")
def __lldb_init_module(debugger, internal_dict):
debugger.HandleCommand('command script add -f myscript.print_all_threads pthreads')Load: command script import /path/to/myscript.py
For a full GDB↔LLDB command map, see references/gdb-lldb-map.md.
Related skills
- Use
skills/debuggers/gdbfor GDB workflows - Use
skills/debuggers/core-dumpsfor core dump analysis - Use
skills/compilers/clangfor building with debug info
