[all-commits] [llvm/llvm-project] 96d229: [flang][driver] Add options for unparsing

[Andrzej Warzyński via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 96d229c9abdfb2836e18a554bfb63b5d52aeebfa
      https://github.com/llvm/llvm-project/commit/96d229c9abdfb2836e18a554bfb63b5d52aeebfa
  Author: Andrzej Warzynski <andrzej.warzynski at arm.com>
  Date:   2021-02-16 (Tue, 16 Feb 2021)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M flang/include/flang/Frontend/FrontendActions.h
    M flang/include/flang/Frontend/FrontendOptions.h
    M flang/lib/Frontend/CMakeLists.txt
    M flang/lib/Frontend/CompilerInvocation.cpp
    M flang/lib/Frontend/FrontendActions.cpp
    M flang/lib/Frontend/FrontendOptions.cpp
    M flang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
    M flang/lib/Parser/CMakeLists.txt
    M flang/test/Flang-Driver/driver-help.f90
    M flang/test/Parser/continuation-in-if.f
    M flang/test/Parser/pp-dir-comments.f90
    M flang/test/Semantics/canondo01.f90
    M flang/test/Semantics/canondo02.f90
    M flang/test/Semantics/canondo03.f90
    M flang/test/Semantics/canondo04.f90
    M flang/test/Semantics/canondo05.f90
    M flang/test/Semantics/critical04.f90
    M flang/test/Semantics/defined-ops.f90
    M flang/test/Semantics/doconcurrent02.f90
    M flang/test/Semantics/doconcurrent03.f90
    M flang/test/Semantics/doconcurrent04.f90
    M flang/test/Semantics/doconcurrent07.f90
    M flang/test/Semantics/label02.f90
    M flang/test/Semantics/label03.f90
    M flang/test/Semantics/label04.f90
    M flang/test/Semantics/label05.f90
    M flang/test/Semantics/label06.f90
    M flang/test/Semantics/label07.f90
    M flang/test/Semantics/label08.f90
    M flang/test/Semantics/label09.f90
    M flang/test/Semantics/label10.f90
    M flang/test/Semantics/label12.f90
    M flang/test/Semantics/label13.f90
    M flang/test/Semantics/label15.f90
    M flang/test/lit.cfg.py
    M flang/tools/f18/f18.cpp

  Log Message:
  -----------
  [flang][driver] Add options for unparsing

This patch adds the following compiler frontend driver options:
  * -fdebug-unparse (f18 spelling: -funparse)
  * -fdebug-unparse-with-symbols (f18 spelling: -funparse-with-symbols)
The new driver will only accept the new spelling. `f18` will accept both
the original and the new spelling.

A new base class for frontend actions is added: `PrescanAndSemaAction`.
This is added to reduce code duplication that otherwise these new
options would lead to. Implementation from
  * `ParseSyntaxOnlyAction::ExecutionAction`
is moved to:
  * `PrescanAndSemaAction::BeginSourceFileAction`
This implementation is now shared between:
  * PrescanAndSemaAction
  * ParseSyntaxOnlyAction
  * DebugUnparseAction
  * DebugUnparseWithSymbolsAction

All tests that don't require other yet unimplemented options are
updated. This way `flang-new -fc1` is used instead of `f18` when
`FLANG_BUILD_NEW_DRIVER` is set to `On`. In order to facilitate this,
`%flang_fc1` is added in the LIT configuration (lit.cfg.py).

`asFortran` from f18.cpp is duplicated as `getBasicAsFortran` in
FrontendOptions.cpp. At this stage it's hard to find a good place to
share this method. I suggest that we revisit this once a switch from
`f18` to `flang-new` is complete.

Differential Revision: https://reviews.llvm.org/D96483