d26c78b2ad
When a module variable is referenced inside an internal procedure, but the use statement for the module is inside the host, semantics may not create any symbols with HostAssocDetails directly under the internal procedure scope. So pft::getScopeVariableList, that is called in the bridge when lowering the internal procedure scope, failed to instantiate the module variables. This lead to "symbol is not mapped to any IR value" compile time errors. This patch fixes the issue by adding the variables to the list of "captured" global variables from the host program, so that they are instantiated as part of the `internalProcedureBindings` in the bridge. The rational of doing it that way instead of changing `getScopeVariableList` is that `getScopeVariableList` would have to import all the module variables used inside the host since it cannot know which ones are referenced inside the internal procedure from the semantics::Scope information. The fix in this patch only instantiates the module variables from the host that are actually referenced inside the internal procedure. |
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| cmake/modules | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| module | ||
| runtime | ||
| test | ||
| tools | ||
| unittests | ||
| .clang-format | ||
| .clang-tidy | ||
| .drone.star | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| LICENSE.TXT | ||
| 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.