如何列出 .so 文件中的符号

问题描述

如何列出从 .so 文件导出的符号?如果可能，我还想知道它们的来源(例如，它们是否是从静态库中提取的).

How do I list the symbols being exported from a .so file? If possible, I'd also like to know their source (e.g. if they are pulled in from a static library).

我使用的是 gcc 4.0.2，如果这有区别的话.

I'm using gcc 4.0.2, if that makes a difference.

推荐答案

列出符号的标准工具是 nm，你可以像这样简单地使用它:

The standard tool for listing symbols is nm, you can use it simply like this:

nm -gD yourLib.so

如果您想查看 C++ 库的符号，请添加-C"选项，该选项可对符号进行解构(解构后可读性更高).

If you want to see symbols of a C++ library, add the "-C" option which demangle the symbols (it's far more readable demangled).

nm -gDC yourLib.so

如果您的 .so 文件是 elf 格式，您有两个选择:

If your .so file is in elf format, you have two options:

任一objdump(-C 也可用于对 C++ 进行分解):

Either objdump (-C is also useful for demangling C++):

$ objdump -TC libz.so

libz.so:     file format elf64-x86-64

DYNAMIC SYMBOL TABLE:
0000000000002010 l    d  .init  0000000000000000              .init
0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 free
0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 __errno_location
0000000000000000  w   D  *UND*  0000000000000000              _ITM_deregisterTMCloneTable

或者使用readelf:

$ readelf -Ws libz.so
Symbol table '.dynsym' contains 112 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND
     1: 0000000000002010     0 SECTION LOCAL  DEFAULT   10
     2: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND free@GLIBC_2.2.5 (14)
     3: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND __errno_location@GLIBC_2.2.5 (14)
     4: 0000000000000000     0 NOTYPE  WEAK   DEFAULT  UND _ITM_deregisterTMCloneTable

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