|author||Slava Zakharin <email@example.com>||Fri Jun 02 14:20:21 2023 -0700|
|committer||Copybara-Service <firstname.lastname@example.org>||Fri Jun 02 14:46:29 2023 -0700|
[flang][hlfir] Added allocatable/pointer support in hlfir::convertToValue. The code is used, for example, when passing arguments to IO or intrinsic calls as value. The allocatable/pointer boxes must be dereferenced, and trivial values have to be loaded. Character and derived values have to stay boxed. I am not sure what to do for the array cases, and I have not seen any test triggering it, so I leave it as a TODO. Reviewed By: tblah, clementval Differential Revision: https://reviews.llvm.org/D151925 GitOrigin-RevId: 1c8b7c5299710b3d02cebbdef34c41157f3237f2
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.
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.
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Consult the Getting Started with Flang for information on building and running flang.