Welcome to Flang’s documentation

Flang is LLVM’s Fortran frontend

• Flang 13.0.0 Release Notes

Contributing to Flang

• Getting Involved
• Fortran For C Programmers
• Flang C++ Style Guide
• C++14/17 features used in f18
• Pull request checklist
• How to implement a Sematic Check in Flang

Design Documents

• Overview of Compiler Phases
• Fortran Preprocessing
• The F18 Parser
• Semantics: Resolving Labels and Construct Names
• Module Files
• Semantic Analysis
• OpenMP Semantic Analysis
• Control Flow Graph
• Design: Fortran IR
• Fortran I/O Runtime Library Internal Design
• Fortran 2018 Grammar
• OpenMP 4.5 Grammar
• Compiler directives supported by Flang
• Fortran Extensions supported by Flang
• A categorization of standard (2018) and extended Fortran intrinsic procedures
• Compiler options comparison
• Parser Combinators
• Runtime Descriptors
• The derived type runtime information table
• Representation of Fortran function calls
• Implementation of CHARACTER types in f18
• Array Composition
• Bijective Internal Name Uniquing
• DO CONCURRENT isn’t necessarily concurrent
• Fortran Tests in the LLVM Test Suite

Indices and tables

• Index

• Module Index

• Search Page