LLVM Compiler
- 1. B.P. PODDAR INSTITUTE OF MANAGEMENT AND TECHNOLOGY BY-------- DEBANKA KHAN(9013) CHAYAN PATHAK(9041) DIGANTA GHOSH(9050) DEBAJYOTI ROY CHOWDHURY (9032) Topic:- LLVM Compiler
- 2. Contents ❖ What’s LLVM? ❖ History of LLVM ❖ How Is LLVM Different From GCC? ❖ How A LLVM Compiler Works? ❖ Automatic code optimization with LLVM ❖ Components ❖ What LLVM doesn’t do
- 3. What’s LLVM? As per the official site(https://llvm.org/): The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.The name "LLVM" itself is not an acronym; it is the full name of the project. LLVM is a compiler and a toolkit for building compilers, which are programs that convert instructions into a form that can be read and executed by a computer.
- 4. History of LLVM The LLVM project started in 2000 at the University of Illinois at Urbana–Champaign, under the direction of Vikram Adve and Chris Lattner. LLVM was originally developed as a research infrastructure to investigate dynamic compilation techniques for static and dynamic programming languages.Now, LLVM is a brand that applies to the LLVM umbrella project, the LLVM intermediate representation (IR), the LLVM debugger, the LLVM implementation of the C++ Standard Library etc. LLVM is written in C++. The LLVM logo
- 5. How Is LLVM Different From GCC? LLVM and the GNU Compiler Collection (GCC) are both compilers. The difference is that GCC supports a number of programming languages while LLVM isn’t a compiler for any given language. LLVM is a framework to generate object code from any kind of source code.
- 6. How A LLVM Compiler Works? LLVM can provide the middle layers of a complete compiler system, taking intermediate representation (IR) code from a compiler and emitting an optimized IR. On the front end, the LLVM compiler infrastructure uses clang — a compiler for programming languages C, C++ and CUDA — to turn source code into an interim format. Then the LLVM clang code generator on the back end turns the interim format into final machine code.
- 7. Automatic code optimization with LLVM LLVM doesn’t just compile the IR to native machine code. You can also programmatically direct it to optimize the code with a high degree of granularity, all the way through the linking process. The optimizations can be quite aggressive, including things like inlining functions, eliminating dead code (including unused type declarations and function arguments), and unrolling loops.
- 8. Components LLVM Umbrella Back Ends Front Ends Intermediate Representation C++ Standard Library Debugger LLVM has become an umbrella project containing multiple components.
- 9. What LLVM doesn’t do ❖ LLVM does not parse a language’s grammar. Many tools already do that job, like lex/yacc, flex/bison, Lark, and ANTLR. ❖ there are still common parts of languages that LLVM doesn’t provide primitives for. Many languages have some manner of garbage-collected memory management, either as the main way to manage memory or as an adjunct to strategies like RAII (which C++ and Rust use). LLVM doesn’t give you a garbage-collector mechanism, but it does provide tools to implement garbage collection But now, LLVM is developing quickly, with a major release every six months or so. And the pace of development is likely to only pick up