[PATCH] D120568: [flang][driver] Add support for -S and implement -c/-emit-obj

[Andrzej Warzynski via Phabricator via cfe-commits]

awarzynski created this revision.
awarzynski added reviewers: rovka, clementval, schweitz, Leporacanthicus.
Herald added subscribers: Chia-hungDuan, mehdi_amini, dang, rriddle, pengfei, kristof.beyls, mgorny.
Herald added a reviewer: sscalpone.
Herald added a project: Flang.
awarzynski requested review of this revision.
Herald added subscribers: cfe-commits, stephenneuendorffer, jdoerfert.
Herald added a project: clang.

This patch adds support for:

- `-S` in Flang's compiler and frontend drivers

and implements (these options were already available as placeholders):

- `-emit-obj` in Flang's frontend driver and `-c` in Flang's compiler driver

The semantics of these options in Clang and Flang are identical.

The `EmitObjAction` frontend action is renamed as `BackendAction`. The
new name more accurately reflects the fact that this action will
primarily run the code-gen/backend pipeline in LLVM. It also makes more
sense as an action implementing both `-emit-obj` and `-S` (originally it
was just `-emit-obj`).

`tripleName` in FirContext.cpp is updated from `fir.triple` to
`llvm.target_triple`. The former was effectively ignored. The latter is
used when lowering from the LLVM dialect in MLIR to LLVM IR (i.e. it's
embedded in the generated LLVM IR module). The driver can then re-use
that when configuring the backend. With this change, the LLVM IR files
generated by e.g. `tco` will from now on contain the correct target
triple.

The code-gen.f90 test is replaced with code-gen-x86.f90 and
code-gen-aarch64.f90. With 2 seperate files we can verify that
`--target` is correctly taken into account. LIT configuration is updated
to enable e.g.:

  ! REQUIRES: aarch64-registered-target


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120568

Files:
  clang/include/clang/Driver/Options.td
  flang/include/flang/Frontend/FrontendActions.h
  flang/include/flang/Frontend/FrontendOptions.h
  flang/lib/Frontend/CMakeLists.txt
  flang/lib/Frontend/CompilerInvocation.cpp
  flang/lib/Frontend/FrontendActions.cpp
  flang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
  flang/lib/Optimizer/Support/FIRContext.cpp
  flang/test/CMakeLists.txt
  flang/test/Driver/code-gen-aarch64.f90
  flang/test/Driver/code-gen-x86.f90
  flang/test/Driver/code-gen.f90
  flang/test/Driver/driver-help-hidden.f90
  flang/test/Driver/driver-help.f90
  flang/test/Driver/emit-asm-aarch64.f90
  flang/test/Driver/emit-asm-x86.f90
  flang/test/Driver/syntax-only.f90
  flang/test/Fir/target-rewrite-triple.fir
  flang/test/lit.cfg.py
  flang/test/lit.site.cfg.py.in
  flang/tools/flang-driver/fc1_main.cpp
  flang/unittests/Frontend/CMakeLists.txt
  flang/unittests/Frontend/FrontendActionTest.cpp

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