社区首页 >问答首页 >如何使用pyelftools/libdwarf查找一行代码问如何使用pyelftools/libdwarf查找一行代码ENStack Overflow用户提问于 2019-10-11 02:35:43回答 1查看 616关注 0票数 0我有一个函数名和一个距该函数顶部的偏移量。我知道我可以通过查看汇编清单文件找到代码行，并计算代码行的偏移量，然后以这种方式获得行号。
我正在尝试做的是使用.o文件来获取相同的信息。我可以看到ELF文件的DWARF信息，可以在DWARF数据中找到函数的骰子，但我如何真正看到该函数的指令信息并将其映射到一行代码。我一直在使用pyelftools，所以我希望能够使用它，但如果我不能使用pyelftools，我对其他选择持开放态度。
debuggingelfdwarfpyelftools关注问题分享EN回答 1推荐最新Stack Overflow用户发布于 2020-01-11 02:19:55
pyelftools中有一个示例可以做到这一点：https://github.com/eliben/pyelftools/blob/master/examples/dwarf_decode_address.py
具体来说，查找地址行的过程如下所示：
代码语言：javascript复制def decode_file_line(dwarfinfo, address):
# Go over all the line programs in the DWARF information, looking for
# one that describes the given address.
for CU in dwarfinfo.iter_CUs():
# First, look at line programs to find the file/line for the address
lineprog = dwarfinfo.line_program_for_CU(CU)
prevstate = None
for entry in lineprog.get_entries():
# We're interested in those entries where a new state is assigned
if entry.state is None:
continue
if entry.state.end_sequence:
# if the line number sequence ends, clear prevstate.
prevstate = None
continue
# Looking for a range of addresses in two consecutive states that
# contain the required address.
if prevstate and prevstate.address <= address < entry.state.address:
filename = lineprog['file_entry'][prevstate.file - 1].name
line = prevstate.line
return filename, line
prevstate = entry.state
return None, None收藏分享票数 1EN页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持原文链接：https://stackoverflow.com/questions/58329137
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