On Sun, Jan 27, 2019 at 10:33 AM Adrian Prantl <apra...@apple.com> wrote: > > On Jan 26, 2019, at 6:41 PM, David M. Lary via lldb-dev > > <lldb-dev@lists.llvm.org> wrote: > > > > I'm writing a Swift application for MacOS that makes use of a C/C++ > > dylib from a third party to interact with a film scanner. The > > application uses dlopen() & dlsym() to discover and call the C wrapper > > function for the C++ implementation. Overall this works, but I've run > > into the following wall while debugging an issue within the dylib > > itself. > > > > While debugging I want to examine std::list <T> structures in memory > > by address. I am stopped deep inside the C++ code, and from what I've > > googled, printing STL variables is possible through `frame variable`, > > however for all of the functions within the dylib, `frame variable` > > doesn't find any variables. > > > > I've tried using `expr -l c++ -- > > reinterpret_cast<std::list<int>>($rdi)`, however this just returns the > > error: "use of undeclared identifier 'std'". > > > > Is there a way to cast an arbitrary address as an STL type, and print > > it out in lldb? > > Casting to a std::list<int> is not a problem at all; however, the error that > you are seeing is because LLDB did not find a type definition for > std::list<int> in the debug information. Did you build the C++ dylib with > full debug information? > > Long-term it should also become possible to just import the C++ "std" Clang > module into LLDB to get access to all types regardless of whether they were > used in the debugged program and available in debug info, but this work isn't > quite finished yet. > > -- adrian
Adrian, I did not build the C++ dylib, and it was not built with full debug information; it comes from a third-party, so I don't control it. However, from what you said, would creating an unrelated C++ dylib, declaring the required types, and linking it into the project provide needed types to lldb? Would I need to use the types to ensure they're not optimized out of the dylib? -David _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
