检查变量和寄存器

检查变量

显示变量的内容

gdb

(gdb) p bar
(gdb) p/x bar

lldb

(lldb) p bar
(lldb) p/x bar

显示当前栈帧的参数和局部变量

gdb

(gdb) info args
(gdb) info locals

lldb

(lldb) frame variable
(lldb) fr v

# add '-no-args' to disable args

(lldb) frame variable --no-args
(lldb) fr v -a

检查数组

gdb

(gdb) p *ptr@10

lldb

(lldb) parray 10 ptr

检查寄存器

显示当前线程的通用寄存器

gdb

(gdb) info registers

lldb

(lldb) register read

显示当前线程的所有寄存器

gdb

(gdb) info all-registers

lldb

(lldb) register read --all
(lldb) re r -a

显示当前线程中指定寄存器的值

gdb

(gdb) info all-registers rax rsp rbp

lldb

(lldb) register read rax rsp rbp

显示当前线程中指定寄存器的值，格式为二进制

gdb

(gdb) p/t $rax

lldb

(lldb) register read --format binary rax
(lldb) re r -f b rax

# LLDB now supports the GDB shorthand format syntax but there can’t be space after the command

(lldb) register read/t rax
(lldb) p/t $rax

打印表达式结果的动态类型 (C++)

gdb

(gdb) set print object 1
(gdb) p someCPPObjectPtrOrReference
(Only works for C++ objects)

lldb

(lldb) expr -d 1 -- [SomeClass returnAnObject]
(lldb) expr -d 1 -- someCPPObjectPtrOrReference

# or set dynamic type printing to be the default:

(lldb) settings set target.prefer-dynamic run-target