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I need to build an AST using clang and the only tutorials that I found are vague and two years out of date. Could anybody point me to an example?
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Clang uses a recursive-descent parser for several reasons: Performance: a hand-written parser allows us to write a fast parser, optimizing the hot paths as needed, and we're always in control of that performance.
LLVM is a backend compiler meant to build compilers on top of it. It deals with optimizations and production of code adapted to the target architecture. CLang is a front end which parses C, C++ and Objective C code and translates it into a representation suitable for LLVM.
You can use Clang in C99 mode with the -std=c99 option.
Clang operates in tandem with the LLVM compiler back end and has been a subproject of LLVM 2.6 and later. As with LLVM, it is free and open-source software under the Apache License 2.0 software license. Its contributors include Apple, Microsoft, Google, ARM, Sony, Intel, and AMD.
There are several tutorial available that demonstrate the use of the Preprocessor class and how to build an AST:
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