LLVM

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LLVM

简介

LLVM（Low Level Virtual Machine）底层虚拟机，是一个开源(BSD)编译器的基础设施，使用C++编写。它是为了任意一种编程语言写成的程序，利用虚拟技术，创造出编译时，链结时，运行时以及“闲置时”的最佳化。它最早是以 C/C++为处理对象，目前它支持了包括Objective-C, Fortran, Ada, Haskell, Java bytecode, Python, Ruby, ActionScript, GLSL以及其他语言。

LLVM 采用 University of Illinois/NCSA Open Source License, or UIUC 许可证，基于MIT/X11 license and the 3-clause BSD license，兼容GPL。

新闻

• 因不满社区变化，LLVM 资深开发者发长邮件宣布退出 (2018.05)

版本

• 13
• 12
• 11

功能

The LLVM compiler system for C and C++ includes the following:

• Front-ends for C, C++, Objective-C, Fortran, etc based on the GCC 4.2 parsers. They support the ANSI-standard C and C++ languages to the same degree that GCC supports them. Additionally, many GCC extensions are supported.
• A stable implementation of the LLVM instruction set, which serves as both the online and offline code representation, together with assembly (ASCII) and bytecode (binary) readers and writers, and a verifier.
• A powerful pass-management system that automatically sequences passes (including analysis, transformation, and code-generation passes) based on their dependences, and pipelines them for efficiency.
• A wide range of global scalar optimizations.
• A link-time interprocedural optimization framework with a rich set of analyses and transformations, including sophisticated whole-program pointer analysis, call graph construction, and support for profile-guided optimizations.
• An easily retargettable code generator, which currently supports X86, X86-64, PowerPC, PowerPC-64, ARM, Thumb, SPARC, Alpha, and IA-64.
• A Just-In-Time (JIT) code generation system, which currently supports X86, X86-64, PowerPC and PowerPC-64.
• Support for generating DWARF debugging information.
• A C back-end useful for testing and for generating native code on targets other than the ones listed above.
• A profiling system similar to gprof.
• A test framework with a number of benchmark codes and applications.
• APIs and debugging tools to simplify rapid development of LLVM components.

指南

Debian

LLVM Debian/Ubuntu nightly packages

安装完，符号链接下。

sudo ln -s /usr/bin/clang-13 /usr/bin/clang
sudo ln -s /usr/bin/clang++-13 /usr/bin/clang++
clang --version

macOS

port search llvm
sudo port install llvm-3.3

项目

• LLVM GitHub Topics
• Haskell LLVM JIT Compiler Tutorial Implementing a JIT Compiled Language with Haskell and LLVM
• Cilk Plus/LLVM
• LLILC is an LLVM based MSIL Compiler
• LLVM IR入门指南
• Emscripten An LLVM-to-WebAssembly Compiler
• DragonEgg Using LLVM as a GCC backend

文档

• LLVM and Clang: Next Generation Compiler Technology
• Embedded FreeBSD on a five-core RISC-V processor using LLVM
• LLVM 入门教程

图集

• 

  DragonEgg

链接

• LLVM官网
• LLVM @ GitHub
• LLVM开放文档
• LLVM API Documentation
• 为什么人人都该懂点LLVM
• Azul Systems推出Falcon，一个基于LLVM的新的Java即时编译器