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LLVM_NODISCARD is defined in llvm/include/llvm/Support/Compiler.h in a portable way. It allows use of compiler-specific feature of which warning if a type or return value is discarded.

some important predefined subclass of passesModulePassThis is the most general superclass. By inheriting this class we allow the entire module to be analyzed at once. The functions within the module...

LLVM Directory LayoutSource-code of llvm-project clone with git:https://github.com/llvm/llvm-project.gitHEAD detached at llvmorg-9.0.0After the source-code is downloaded, a directory named ‘llvm-pr...

Look into the mechanism translating from source-code to machine-code in llvmWhat I aim to do here is follow the various incarnations an “instruction” takes when it goes through LLVM’s multiple compil...

What is the effect of “–debug-pass” option on opt tool?opt is the LLVM optimizer and analyzer tool that is run on LLVM IR to optimize the IR or produce an analysis about it.We can direct the opt too...

Life of an instruction in LLVMLLVM is a complex piece of software. There are several paths one may take on the quest of understanding how it works, none of which is simple. I recently had to dig in s...

The Unwind Process​ The standard ABI exception handling / unwind process begins with the raising of an exception, in one of the forms mentioned above. This call specifies an exception object and an e...

What dose the ‘DWARF’ mean in llvm?​ It is the backronym ‘Debug With Attributed Record Formats’. DWARF is widely used, standardized debugging data format. It was originally designed along with ELF(Ex...

​ Exception tables are necessary to handle exceptions thrown by functions in high-level languages such as C++.​ Unwind tables contain debug frame information which is also necessary for the handling ...

How to solve ExecutionEngine OprofileJIT compilation error?My llvm source is HEAD detached at llvmorg-9.0.0.After making llvm cmake project, and compiling it, an error occured. As follow:The way t...

How to solve ‘undefined reference to llvm::createLowerSwitchPass()’ when compiling Obfuscator(llvm-9.0) ?How to solve the problem that an error occurs in Obfuscator(llvm-9.0) compilation, as follow f...