llvm

I defined int a = 5 ; in the source code, and I transform the source to LLVM IR: %a = alloca i32, align 4 store i32 5, i32* %a, align 4 I want to insert int b = a; by writing a pass. I compile int a=5; int b=a into LLVM IR, it load "a" first, then store it. I also checked the doxygen, in which the LoadInst is LoadInst (Value *Ptr, const Twine &NameStr, Instruction *InsertBefore) Still, I don't know how to get the Value of "a". How to get a variable value? In LLVM IR the sequence int a = 5; int b = a; without any optimization, is translated as %a = alloca i32, align 4 %b = alloca i32, align 4

I'm trying to find info and I don't see it on clang web site. I'm thinking to try to use it on windows, but I have no clue if it has it's own libc or it uses broken libc from MS? another question: if i compile code with clang, will I be able to use visual studio as a debugger, e.g. is clang capable of emitting debugging symbols in MS format (this is the reason I don't want to use gcc; and this is something that intel compiler can do, but it uses MS's libc). In short, I'd like to be able to use visual studio as a debugger, but I need at the same time decent real c compiler with normal lib c. or

I need to extract the directory and filename during a llvm pass. The current version of llvm moved getFilename and getDirectory from DebugLoc to DebugInfoMetadata . I can't find a class member getFilename directly in the DebugLoc header. Thus, how to do I go from an instruction to source code filename and directory? http://llvm.org/docs/doxygen/html/classllvm_1_1DebugLoc.html Additionally, there is a print function that might help but it only takes a llvm::raw_ostream and can't be redirected to a std::string . void print (raw_ostream &OS) const // prints source location /path/to/file.exe:line

I recently installed LLVM v8.0.0 (on RHEL 7.4). I am going through the LLVM Kaleidoscope tutorial to learn how to use the system, but am running into an issue linking. Per the tutorial ( end of chapter 2 ), I run: clang++ -g -O3 kld.cpp `llvm-config --cxxflags` -o kld It compiles, but the linker fails on: /tmp/kld-f7264f.o:(.data+0x0): undefined reference to `llvm::EnableABIBreakingChecks' clang-8: error: linker command failed with exit code 1 (use -v to see invocation) I suspected this may have been an issue with llvm-config , so I also tried using the --ldflags and --system-libs flags, but

I am trying to add a new pass to the llvm compiler infrastructure. I have been able to build LLVM-2.9 using make.But I wants to build using Eclipse so that I can trace the code. I imported llvm source files to c++ project with LinuxGcc tool chain and CDT internal builder(Eclipse with CDT-7.0).But it gives some errors. Is this is a right way to build llvm using eclipse?. Please suggest me steps involved to build llvm source using Eclipse. Note: Platform ubuntu. You can use cmake -G"Eclipse CDT4 - Unix Makefiles" to produce the native Eclipse set of projects. It might require tweaking your

Can LLVM, QEMU, GDB, Bochs, OpenStack or the like be used to unit test lock-free concurrent code on an open-source platform? Has anyone achieved this? If you answer by recommending software, I don't mind, but I mention LLVM, QEMU and the others because these function at various different levels. I should like to learn at which level practical success has been found at interleaving threads under unit-test control. I am aware of SPIN/Promela, incidentally. That is fine software but one cannot compile C++, Rust, etc., onto a SPIN/Promela target as far as I know. Examples of existing, open-source