gdb，转储内存，将格式化输出保存到文件中 [英] gdb, dump memory, save formatted output into a file

问题描述

我有一辆越野车（内存泄露）软件。
作为证据，我有1GB的core.dump文件。堆大小为900MB，显然，分配的东西，但不释放内存。

所以，我有一个内存区域来检查像这样。

 （gdb）x / 50000s 0x200000000 
  

然而，这仅仅是肉眼难以猜测的，哪个对象或结构没有被释放。
我的想法是：将gdb格式化的输出保存到一个文件中，然后运行模式匹配查看哪个魔法字符串出现最多。所以，这里是我的问题：

如何将以下命令的输出保存到文本文件中，以便我可以编写分析器？

 （gdb）x / 10000000s 0x20000000<  - 我需要输出到文件
  

感谢您的任何帮助。 您可以使用转储gdb的功能，请参阅： https://sourceware.org/gdb/onlinedocs/gdb/Dump_002fRestore-Files .html

例如：

 转储二进制内存result.bin 0x200000000 0x20000c350 
  

这会给你一个普通的二进制转储int文件 result.bin 。您还可以使用以下内容以十六进制格式转储它：

 转储ihex内存result.bin 0x200000000 0x20000c350 
  

使用dump命令比使用gdb日志记录hack更清晰（它甚至不会为我工作） p>

I have a buggy (memory leaked) software. As an evidence, I have 1GB of core.dump file. Heap size is 900MB, so obviously, something allocates, but don't free the memory.

So, I have a memory region to examine like this.

(gdb) x/50000s 0x200000000

However, this is hard to guess only with naked eyes, which object or struct is not freed. My idea to trace is, "Save gdb formatted output into a file, and run a pattern match to see which magic string comes up the most." So, here is my question:

How can I save output of following command into a textfile, so that I can write an analyzer?

(gdb) x/10000000s 0x20000000    <-- I need this output into a file

Thank you for any help.

解决方案

You could use the "dump" function of gdb, see: https://sourceware.org/gdb/onlinedocs/gdb/Dump_002fRestore-Files.html

For your example:

dump binary memory result.bin 0x200000000 0x20000c350

This will give you a plain binary dump int file result.bin. You can also use the following to dump it in hex format:

dump ihex memory result.bin 0x200000000 0x20000c350

Using the dump command is much clearer than using the gdb logging hack (which even did not work for me somehow).

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