英文:
Get source location for address at runtime using debug information
问题
在我的C程序中，我有一个指令指针，指向虚拟内存中的某个地址，例如一个函数指针。
我想使用运行时执行的二进制文件中的调试信息，将这个地址映射到相应的源代码位置（文件路径、行号）。
我知道GDB实现了类似的功能，但不确定如何在我的项目中实现这一功能。
我知道addr2line和llvm-symbolizer，但这两个工具都分析ELF文件中的地址，而不是已加载到虚拟内存中的二进制文件。
类似地，这与如何在我的C++程序中访问addr2line功能？不重复。
英文:
In my C program, I have an instruction pointer that points to some address in virtual memory, e.g., a function pointer.
I would like to map this address to the corresponding source location (file path, line number) using the debug information in the executed binary at runtime.
I know that GDB implements something like this, but am unsure how to approach this for my project.
I'm aware of addr2line and llvm-symbolizer, but both of those tools analyze addresses in ELF files, not binaries that are already loaded into virtual memory.
Similarly, this is not a duplicate of How do I access the addr2line functionality within my C++ program?
答案1
得分: 0
由于Yakov Galka的评论，我找到了解决我想要做的事情的方法：
#define __USE_GNU
#include <dlfcn.h>
// 我想要源位置的指令地址
const void* code_addr = 0xabcdef;
// 调用dladdr来找出虚拟内存中的基地址
Dl_info info;
dladdr(code_addr, &info);
size_t base_address = (size_t) info.dli_fbase;
size_t relative_address = ((size_t) code_addr) - base_address;
// 在我的情况下: relative_address == 0x126c
然后，我可以调用addr2line来确定源位置。在我的情况下，所有内容都链接到a.out，所以我可以直接调用
addr2line --basenames -i -e tasks.out 0x126c
然后会打印出类似以下的内容：
filename.c:42
英文:
Thanks to Yakov Galka's comment, I found a solution for what I want to do:
#define __USE_GNU
#include <dlfcn.h>
// instruction address for which I want the source location
const void* code_addr = 0xabcdef;
// call dladdr to figure out base address in virtual memory
Dl_info info;
dladdr(code_addr, &info);
size_t base_address = (size_t) info.dli_fbase;
size_t relative_address = ((size_t) code_addr) - base_address;
// in my case: relative_address == 0x126c
Then, I can call addr2line to determine the source location. In my case, everything is liked into a.out, so I can just call
addr2line --basenames -i -e tasks.out 0x126c
which then prints something like:
filename.c:42
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