LLVM is a library that is used to construct, optimize and produce intermediate and/or binary machine code. LLVM can be used as a compiler framework, where you provide the “front-end” (parser and lexer) and the “back-end” (code that converts LLVM’s representation to actual machine code). LLVM can also act as a JIT compiler – it … Read more
This has been already answered in the Apple developer forum, you can find the whole discussion in here. In the answer marked as the solution to the question they say: 1 – check your PATH variable first: $ echo $PATH 2 – assuming /System/Library/Frameworks is not included in PATH, add it: $ PATH=$PATH:/System/Library/Frameworks 3 -now … Read more
There are number of options actually. The 2 that you’ll probably be interested in are -march=c and -march=cpp, which are options to llc. Run: llc -march=c -o code.c code.ll This will convert the LLVM bitcode in code.ll back to C and put it in code.c. Also: llc -march=cpp -o code.cpp code.ll This is different than … Read more
There are several reasons why LLVM rolls its own RTTI system. This system is simple and powerful, and described in a section of the LLVM Programmer’s Manual. As another poster has pointed out, the Coding Standards raises two major problems with C++ RTTI: 1) the space cost and 2) the poor performance of using it. … Read more
People say it is possible with custom toolchains. I didn’t make a research on them because easier solution worked well for me: It is also possible to run frontend plugins directly by setting appropriate “build settings” of Xcode. (Several ways to do this, you can set them on the command line for instance: xcodebuild build … Read more
mcsema is a production-quality binary lifter. It takes x86 and x86-64 and statically “lifts” it to LLVM IR. It’s actively maintained, BSD licensed, and has extensive tests and documentation. https://github.com/trailofbits/mcsema
As of clang 3.2 (circa February 2012), “default synthesis” (or “auto property synthesis”) of Objective-C properties is provided by default. It’s essentially as described in the blog post you originally read: http://www.mcubedsw.com/blog/index.php/site/comments/new_objective-c_features/ (except that that post describes the feature as “enabled, then disabled”; I don’t know if that’s an issue with Xcode or if the … Read more
So far as I can tell, there is no command-line option to list which architectures a given clang binary supports, and even running strings on it doesn’t really help. Clang is essentially just a C to LLVM translator, and it’s LLVM itself that deals with the nitty-gritty of generating actual machine code, so it’s not … Read more
Foreknowledge: I had same delusion about this: “If llvm is targeting for all backends including riscv, we should be able to compile our codes just giving a clang flag like –target=riscv32, -target riscv64 etc. without doing extra operation” and I had similar question, but it is not like that. Although LLVM supports riscv target, you … Read more
There are two ways to do this in lldb. Most commonly, you use the parray lldb command which takes a COUNT and an EXPRESSION; EXPRESSION is evaluated and should result in a pointer to memory. lldb will then print COUNT items of that type at that address. e.g. parray 10 ptr where ptr is of … Read more