Xcode “如何使用lldb”；“内存查找”；指挥部？

根据lldb联机帮助，

内存查找

的工作原理如下：

Find a value in the memory of the process being debugged.

Syntax: memory find <cmd-options> <address> <value> [<value> [...]]

Command Options Usage:
  memory find <address> <value> [<value> [...]]
  memory find [-e <expr>] [-s <name>] [-c <count>] [-o <offset>] <address> <value> [<value> [...]]

       -c <count> ( --count <count> )
            How many times to perform the search.

       -e <expr> ( --expression <expr> )
            Evaluate an expression to obtain a byte pattern.

       -o <offset> ( --dump-offset <offset> )
            When dumping memory for a match, an offset from the match location
            to start dumping from.

       -s <name> ( --string <name> )
            Use text to find a byte pattern.

     This command takes options and free-form arguments.  If your arguments
     resemble option specifiers (i.e., they start with a - or --), you must use
     ' -- ' between the end of the command options and the beginning of the
     arguments.

(lldb) me fi -s "f" -- ptr ptr+8192*256
Your data was found at location: 0x11033e20c
0x11033e20c: 66 bb 58 07 d0 b7 32 7d ff 7f 00 00 66 5b e7 82  f.X...2}....f[..

或

或

我在谷歌上搜索了一些用法示例，但什么也没找到。如果有人举一个有效的例子，我将不胜感激。特别是，我想从指针标识的块的开始搜索给定数量的字节，以找到特定（字节）值（本例中为255）的第一次出现

我在OSX上使用的是Xcode 7.0.1，lldb版本是

lldb-340.4.70

。

---

更新 我发现

-s

选项可以正常工作，例如：

Find a value in the memory of the process being debugged.

Syntax: memory find <cmd-options> <address> <value> [<value> [...]]

Command Options Usage:
  memory find <address> <value> [<value> [...]]
  memory find [-e <expr>] [-s <name>] [-c <count>] [-o <offset>] <address> <value> [<value> [...]]

       -c <count> ( --count <count> )
            How many times to perform the search.

       -e <expr> ( --expression <expr> )
            Evaluate an expression to obtain a byte pattern.

       -o <offset> ( --dump-offset <offset> )
            When dumping memory for a match, an offset from the match location
            to start dumping from.

       -s <name> ( --string <name> )
            Use text to find a byte pattern.

     This command takes options and free-form arguments.  If your arguments
     resemble option specifiers (i.e., they start with a - or --), you must use
     ' -- ' between the end of the command options and the beginning of the
     arguments.

(lldb) me fi -s "f" -- ptr ptr+8192*256
Your data was found at location: 0x11033e20c
0x11033e20c: 66 bb 58 07 d0 b7 32 7d ff 7f 00 00 66 5b e7 82  f.X...2}....f[..

可能只是

-e

选项（我在本例中需要此选项）已损坏，例如：

(lldb) me fi -e 255 -- ptr ptr+8191*256
error: expression evaluation failed. pass a string instead?

试图诱使

-s

选项接受转义的十六进制或十进制值似乎也不起作用，不幸的是：

(lldb) me fi -s "\xff" -- ptr ptr+8191*256
Your data was not found within the range.

(lldb) me fi -s "\255" -- ptr ptr+8191*256
Your data was not found within the range.

---

此问题已在开源LLDB中修复，修订版为243893（）

---

我无法对Xcode中此修复程序的可用性发表任何评论，但您可以尝试的一件事是从源代码编译LLDB，并使用手动构建的LLDB和修复程序来调试您的问题

谢谢-我将向Apple提交一份错误报告。

(lldb) me fi -s "\xff" -- ptr ptr+8191*256
Your data was not found within the range.

(lldb) me fi -s "\255" -- ptr ptr+8191*256
Your data was not found within the range.