August 2014
Beginner to intermediate
314 pages
7h 57m
English
Content preview from Getting started with LLVM core librariesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Introducing the llvm::MCJIT framework
The MCJIT class is a novel JIT implementation for LLVM. It differs from the old JIT implementation by the MC framework, explored in Chapter 6, The Backend. MC provides a uniform representation for instructions and is a framework shared among the assembler, disassembler, assembly printer and MCJIT.
The first advantage of using the MC library is that targets need to specify their instruction encodings only once because this information is used by all the subsystems. Therefore, when writing an LLVM backend, if you implement the object code emission for your target, you have the JIT functionality as well.
The llvm::JIT framework is going to be removed after LLVM 3.5 and completely replaced by the llvm::MCJIT framework. ...
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