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List: llvm-dev
Subject: [LLVMdev] How to get dependencies (linked libraries) from a shared object (*.so)?
From: Dimitar Dobrev <dpldobrev () yahoo ! com>
Date: 2014-08-10 9:04:00
Message-ID: 1407661440.85010.YahooMailNeo () web122405 ! mail ! ne1 ! yahoo ! com
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Hello all,
I need to get all dependencies of a .so file. I tried using \
needed_library_begin/needed_library_end but they seem not to give the dependencies \
but something else (if anything) I cannot quite figure out what. I tried testing with \
Linux's ls. I ran "ldd ls" (ldd is Linux-only)and got about six dependencies - as an \
example for one of them I can remember libc. Then I tried this code:
for (auto dep = ObjectFile->needed_library_begin(); dep != \
ObjectFile->needed_library_end(); ++dep) {
llvm::StringRef Path;
if (!dep->getPath(Path))
...
}
where ObjectFile represents the opened *.so - this pointer is guaranteed to be \
correct because I read all exported symbols from it in the same function. Further, I \
opened both ls and *.so with a text editor. They are, of course, binaries, but their \
dependencies can actually be seen as text fragments inside. So Clang should be able \
to read them in some manner, I just don't know what. This is why I'll appreciate your \
help. As a final, hopefully helpful, reference, I'm applying the code I use to \
successfully get the dependencies of a Windows DLL:
if (auto COFFObjectFile = \
llvm::dyn_cast<llvm::object::COFFObjectFile>(ObjectFile)) {
for (auto dep = COFFObjectFile->import_directory_begin(); dep != \
COFFObjectFile->import_directory_end(); ++dep) {
llvm::StringRef Name;
if (!dep->getName(Name) && (Name.endswith(".dll") || \
Name.endswith(".DLL")))
...
}
}
Regards,
Dimitar Dobrev
[Attachment #5 (text/html)]
<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, \
Helvetica Neue, Helvetica, Arial, Lucida Grande, \
sans-serif;font-size:12pt"><div><span></span><span style="" \
class="yiv2823908015"> <br style=""></span></div><div \
style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, \
sans-serif; font-size: 12pt;"><div class="y_msg_container"><div \
id="yiv2823908015"><div><div \
style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, \
Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt;"><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> Hello all,</span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, \
Lucida Grande, sans-serif;background-color:transparent;font-style:normal;"><br \
style="" class="yiv2823908015"><span style="" class="yiv2823908015"></span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent; font-style:normal;"><span style="" \
class="yiv2823908015"> I need to get all dependencies of a .so \
file. I tried using needed_library_begin/needed_library_end but they seem not to give \
the dependencies but something else (if anything)</span> I cannot quite figure out \
what. I tried testing with Linux's ls. I ran "ldd ls" (ldd is Linux-only)<span \
style="" class="yiv2823908015"> and got about six dependencies - as an example for \
one of them I can remember libc. Then I tried this code:</span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> <br style="" \
class="yiv2823908015"></span></div><div class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"></span><span style="" \
class="yiv2823908015"> for (auto dep = \
ObjectFile->needed_library_begin(); dep != ObjectFile->needed_library_end(); \
++dep)<br style="" class="yiv2823908015"> \
{<br style="" class="yiv2823908015"> \
llvm::StringRef Path;<br style="" \
class="yiv2823908015"> \
if (!dep->getPath(Path))</span></div><div class="yiv2823908015" \
style="color:rgb(0, 0, 0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, \
Helvetica, Arial, Lucida Grande, \
sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> </span><span style="" \
class="yiv2823908015"> </span><span style="" \
class="yiv2823908015"> </span><span style="" \
class="yiv2823908015"> ...</span><span style="" \
class="yiv2823908015"><br style="" class="yiv2823908015"></span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> }</span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><br style="" \
class="yiv2823908015"><span style="" class="yiv2823908015"></span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> where ObjectFile represents the opened *.so \
- this pointer is guaranteed to be correct because I read all exported symbols from \
it in the same function. Further, I opened both ls and *.so with a text editor. They \
are, of course, binaries, but their dependencies can actually be seen as text \
fragments inside. So Clang should be able to read them in some manner, I just don't \
know what. This is why I'll appreciate your help.</span></div><div \
class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> As a final, hopefully helpful, reference, \
I'm applying the code I use to successfully get the dependencies of a Windows \
DLL:</span></div><div class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"><br></span></div><div class="yiv2823908015" style="color:rgb(0, \
0, 0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, \
Lucida Grande, sans-serif;background-color:transparent;font-style:normal;"><span \
style="" class="yiv2823908015"> if (auto \
COFFObjectFile = llvm::dyn_cast<llvm::object::COFFObjectFile>(ObjectFile))<br \
style="" class="yiv2823908015"> {<br \
style="" class="yiv2823908015"> \
for (auto dep = COFFObjectFile->import_directory_begin(); dep != \
COFFObjectFile->import_directory_end(); ++dep)<br style="" \
class="yiv2823908015"> \
{<br style="" class="yiv2823908015"> \
llvm::StringRef Name;<br style="" \
class="yiv2823908015"> \
if (!dep->getName(Name) && (Name.endswith(".dll") || \
Name.endswith(".DLL")))<br style="" \
class="yiv2823908015"> \
...<br style="" class="yiv2823908015"> \
}<br style="" class="yiv2823908015"> }<br \
style="" class="yiv2823908015"></span></div><div class="yiv2823908015" \
style="color:rgb(0, 0, 0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, \
Helvetica, Arial, Lucida Grande, \
sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"> </span><span style="" \
class="yiv2823908015"> </span><span style="" \
class="yiv2823908015"><br></span></div><div class="yiv2823908015" style="color:rgb(0, \
0, 0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, \
Lucida Grande, sans-serif;background-color:transparent;font-style:normal;"><span \
class="yiv2823908015tab"> </span>Regards,</div><div \
class="yiv2823908015" style="color:rgb(0, 0, 0); \
font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span \
class="yiv2823908015tab"> </span>Dimitar Dobrev<br><span style="" \
class="yiv2823908015"></span></div><div class="yiv2823908015" style="color:rgb(0, 0, \
0);font-size:16px;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida \
Grande, sans-serif;background-color:transparent;font-style:normal;"><span style="" \
class="yiv2823908015"></span><span style="" class="yiv2823908015"> \
<br style="" class="yiv2823908015"></span></div></div></div></div><br><br></div> \
</div><div class="qtdSeparateBR"><br><br></div><div style="display: block;" \
class="yahoo_quoted"><div style="font-family: HelveticaNeue, Helvetica Neue, \
Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt;"> </div> </div> \
</div></body></html>
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