C++ 如何使用GDB查找内存地址对应的函数
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How to use GDB to find what function a memory address corresponds to
提问by Nathaniel Flath
I am using google's heap checker to track down a memory leak. It gives me a stack trace such as:
我正在使用谷歌的堆检查器来追踪内存泄漏。它给了我一个堆栈跟踪，例如：
Leak of 21 bytes in 1 objects allocated from:
@ 0xf6088241
@ 0xf60890d2
@ 0xf6089246
@ 0x8054781
@ 0x8054862
@ 0xf684ee76
@ 0xf684f343
@ 0x804be4c
@ 0x80544f6
@ 0xf5e52bb6
@ 0x804b101
How do I determine what functions/lines of code these memory addresses correspond to?
如何确定这些内存地址对应的函数/代码行？
回答by ks1322
Use info symbolgdb command. 16 Examining the Symbol Table.
使用info symbolgdb 命令。16 检查符号表。
info symbol addr
Print the name of a symbol which is stored at the address addr. If no symbol is stored exactly at addr, gdb prints the nearest symbol and an offset from it:
打印存储在地址 addr 中的符号名称。如果在 addr 中没有准确存储符号，则 gdb 会打印最近的符号及其偏移量：
(gdb) info symbol 0x54320
_initialize_vx + 396 in section .text
This is the opposite of the info address command. You can use it to find out the name of a variable or a function given its address.
这与 info address 命令相反。您可以使用它来找出变量名或给定地址的函数名。
For dynamically linked executables, the name of executable or shared library containing the symbol is also printed:
对于动态链接的可执行文件，还会打印包含该符号的可执行文件或共享库的名称：
(gdb) info symbol 0x400225
_start + 5 in section .text of /tmp/a.out
(gdb) info symbol 0x2aaaac2811cf
__read_nocancel + 6 in section .text of /usr/lib64/libc.so.6
回答by Brian Vandenberg
The original question asked how to do this in GDB:
原始问题询问如何在 GDB 中执行此操作：
# NOT what you want; note the lack of '*':
(gdb) info symbol 0xfde09edc
blah() + 388 in section .text of /tmp/libblah.so
# IS what you want; note the presence of '*':
(gdb) info line *0xfde09edc
Line 91 of "blah.cc"
starts at address 0xfde09ebc <blah()+356>
and ends at 0xfde09ee4 <blah()+396>
The *is necessary for info lineand shouldn't be used for info symbol.
该*是必要的info line，不应该被用于info symbol。
You can also use the disassemblecommand with its /mflag:
您还可以使用disassemble带有/m标志的命令：
(gdb) disassemble /m 0xfde09edc
... though it's rather verbose and info linegives exactly what was requested.
...虽然它相当冗长，并info line给出了所要求的内容。
回答by Mark B
Assuming your binary has debug information g++ -gyou may be able to use x/to get the info, I know that works for vtables.
假设你的二进制文件有调试信息，g++ -g你可以x/用来获取信息，我知道这适用于 vtables。
x/<num>xwto print <num>hex words of memory, and gdb will annotate the left side with information about what's at the address.
x/<num>xw打印<num>内存的十六进制字，gdb 将用有关地址内容的信息注释左侧。
