| commit | 278c33f1d6545f22db08f90e5c01472fc8690e1b | [log] [tgz] |
|---|---|---|
| author | Krzysztof Parzyszek <Krzysztof.Parzyszek@amd.com> | Tue Mar 12 07:53:57 2024 -0500 |
| committer | Copybara-Service <copybara-worker@google.com> | Tue Mar 12 05:59:02 2024 -0700 |
| tree | 8c9a67860b6db41915ac42e0a45f04c4777573e5 | |
| parent | a08a07ec6c4e21d6ae5a3edf3e8041a5f17f74e2 [diff] |
[flang] Avoid passing null pointers to nonnull parameters (#84785) Certain functions in glibc have "nonnull" attributes on pointer parameters (even in cases where passing a null pointer should be handled correctly). There are a few cases of such calls in flang: memcmp and memcpy with the length parameter set to 0. Avoid passing a null pointer to these functions, since the conflict with the nonnull attribute could cause an undefined behavior. This was detected by the undefined behavior sanitizer. GitOrigin-RevId: 871086bf7fad42d610bfe02224662bdc71494a70
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.
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.