1a4f405c31
The representation of `TEAM_TYPE` in the `ISO_FORTRAN_ENV` module is opaque to the compiler, but the size (and alignment) needs to match the PRIF specification for `prif_team_type` to ensure ABI compatibility with the multi-image runtime library. Flang's old definition as a derived type containing only an `integer(int64)` component was leading to an 8-byte `TEAM_TYPE`. However PRIF specifies the `prif_team_type` component as a `pointer` to an opaque scalar type, which flang compiles to a 40-byte representation. This mismatch was leading to incorrect behavior at runtime for programs compiled with `-fcoarray` and using `TEAM_TYPE`, where `TEAM_TYPE` values returned by PRIF were being silently truncated by the compiler. Change the declaration of `__builtin_team_type` to match the PRIF specification, thus ensuring the representation of `TEAM_TYPE` has the required size. |
||
|---|---|---|
| .. | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| test | ||
| tools | ||
| unittests | ||
| .clang-format | ||
| .clang-tidy | ||
| .drone.star | ||
| .gitignore | ||
| CMakeLists.txt | ||
| LICENSE.TXT | ||
| Maintainers.md | ||
| README.md | ||
Flang
Flang is a ground-up implementation of a Fortran front end written in modern C++. It started off as the f18 project (https://github.com/flang-compiler/f18) with an aim to replace the previous flang project (https://github.com/flang-compiler/flang) and address its various deficiencies. F18 was subsequently accepted into the LLVM project and rechristened as Flang.
Please note that flang is not ready yet for production usage.
Getting Started
Read more about flang in the docs directory. Start with the compiler overview.
To better understand Fortran as a language and the specific grammar accepted by flang, read Fortran For C Programmers and flang's specifications of the Fortran grammar and the OpenMP grammar.
Treatment of language extensions is covered in this document.
To understand the compilers handling of intrinsics, see the discussion of intrinsics.
To understand how a flang program communicates with libraries at runtime, see the discussion of runtime descriptors.
If you're interested in contributing to the compiler, read the style guide and also review how flang uses modern C++ features.
If you are interested in writing new documentation, follow LLVM's Markdown style guide.
Consult the Getting Started with Flang for information on building and running flang.