Libclang is the C Interface to Clang's C family of compilers. It provides a relatively small API that exposes facilities for parsing source code into an abstract syntax tree (AST), loading already-parsed ASTs, traversing the AST, associating physical source locations with elements within the AST, and other facilities that support Clang-based development tools.
This C interface to Clang will never provide all of the information representation stored in Clang's C++ AST, nor should it: the intent is to maintain an API that is relatively stable from one release to the next, providing only the basic functionality needed to support development tools.
You can find an article about libclang for Delphi on my blog.
Neslib.Clang leverages libclang in two ways:
The unit Neslib.Clang.Api providers the header translations for libclang version 14.0. You can use these header translations as you would use libclang from a C language. The documentation for the C API can be found here: https://clang.llvm.org/doxygen/index.html
The unit Neslib.Clang provides a higher level abstraction of the libclang API. It provides a thin class model on top of the libclang API, making it easier to use from Delphi. In addition, it provides automatic memory management so you don't have to worry about what resources to release and when.
Documentation for the Neslib.Clang unit can be found in the Neslib.Clang.Chm file or on-line at https://neslib.github.io/Neslib.Clang.
Because the Clang DLLs are very big (64+ MB), Neslib.Clang only ships with the 32-bit versions of these DLLs. If you prefer to use the 64-bit version, then you will have to download the 64-bit version of LLVM from the LLVM Download Page (be sure to pick the version that matches this Neslib.Clang version).
After installation, you will find libclang.dll in the bin directory. You also need to copy the VC runtime DLLs (msvcp140.dll and vcruntime140.dll) from that directory.
Neslib.Clang is licensed under the Simplified BSD License. See License.txt for details.