Port Classic Flang to LLVM 14 #106

bryanpkc · 2022-04-24T23:34:13Z

This PR ports Classic Flang-related changes from flang-13.0.0-20220325 to llvmorg-14.0.1, on which our new release_14x branch will be based.

I have squashed some commits together to resolve merge conflicts and make them buildable; in such cases, the original commits are cited. In some cases, I have undone the squashes performed by @abrahamtovarmob and separated commits that have clearly different purposes. Some upstream commits which were backported to release_13x did not need to be ported to this branch (89065d4, b4723b9, 0254365).

A commit was added on top of the branch to enable GitHub builds of the release_14x branch.

RichBarton-Arm

I have recently done this exercise downstream so I took a look. I left a few comments in passing for minor things.

It looks like you need to cherry pick across my three recent PR #100 , #102 and #104 .

When doing this downstream, I found a regression in the way classic flang handles preprocessing with -save-temps (and some other not important options). flang -E -save-temps file.F95 causes the preprocessor to be run twice. I have a fix so perhaps it is easiest if I make a separate PR and we can commit it over the top of this one?

clang/include/clang/Driver/Options.td

RichBarton-Arm · 2022-04-25T14:16:02Z

clang/include/clang/Driver/Options.td

  HelpText<"Process source files in fixed form">;
-def ffree_form : Flag<["-"], "ffree-form">, Group<f_Group>,
+#ifdef ENABLE_CLASSIC_FLANG


I'm concerned about using ENABLE_CLASSIC_FLANG to guard additions to Options.td when it does not also guard alterations to Options.td. That seems confusing to me. I don't think there is any chance of an unintended downside to having classic flang options defined in the compiled opt table when classic flang is not included? They simply won't be used by the rest of the code.

I agree with you. Simply porting the old inconsistent guards to LLVM 14 is easy, but we really ought to make these things consistent. I will take a deeper look at the uses of ENABLE_CLASSIC_FLANG in this file. This is a good opportunity to make the file compatible with both LLVM Flang and Classic Flang (we are playing with both downstream).

I have updated the uses of the macro in the file so that the conflicting Fortran options are better guarded.

RichBarton-Arm · 2022-04-25T14:17:31Z

clang/include/clang/Driver/Options.td

 }

+#ifdef ENABLE_CLASSIC_FLANG


Although this is quite nice and clear, despite my comment above about not liking ENABLE_CLASSIC_FLANG use like this....

Perhaps I could be persuaded, but IMO we should just modify this file for classic flang without using ENABLE_CLASSIC_FLANG. What do others think?

For the record, I am very happy with the new approach that lets classic flang sit next to llvm flang wrt Options.td.
Sterling work @bryanpkc

clang/lib/Driver/Driver.cpp

bryanpkc · 2022-04-25T20:56:47Z

I added a patch to revert an ancient change in LoopVectorize.cpp, which was causing an AArch64 test to fail. This probably needs a review by @vjayathirtha-nv or someone more familiar with the motivation of the original patch.

bryanpkc · 2022-04-25T20:57:05Z

@RichBarton-Arm Thanks for the review; I'll address your concerns soon.

bryanpkc · 2022-04-25T22:42:36Z

When doing this downstream, I found a regression in the way classic flang handles preprocessing with -save-temps (and some other not important options). flang -E -save-temps file.F95 causes the preprocessor to be run twice. I have a fix so perhaps it is easiest if I make a separate PR and we can commit it over the top of this one?

That sounds like a good idea. In this PR I was only porting the basic patches from flang-13.0.0-20220325 so there would have been a follow-up PR to cherry-pick other more recent patches. I also didn't notice the double preprocessing problem in our downstream compiler previously.

vjayathirtha-nv · 2022-04-26T05:07:42Z

I added a patch to revert an ancient change in LoopVectorize.cpp, which was causing an AArch64 test to fail. This probably needs a review by @vjayathirtha-nv or someone more familiar with the motivation of the original patch.

Hi @bryanpkc, this comment describes the context for this change. However I'm not in charge of maintaining classic flang anymore, maybe @sscalpone or @schweitzpgi can help you further.

guy-david · 2022-05-01T19:50:58Z

clang/lib/Driver/ToolChains/ClassicFlang.cpp

-    CommonCmdArgs.push_back("120");
-    CommonCmdArgs.push_back("0x4000");
+    if (!GDwarfArg) // -g without -gdwarf-X produces default (DWARFv4)
+      CommonCmdArgs.push_back("0x1000000");


Clang has moved to DWARF 5 by default, should this be updated as well?

The option -Mx,120,0x2000000 should enable DWARF 5, but I am not sure how well it is supported; more thorough testing and perhaps some additional fixes might be needed. I will create an issue to track this work.

I'd be very afraid to change default here. Better the devil you know.

bryanpkc · 2022-05-03T15:00:48Z

flang-compiler/flang#1242 will fix the test failures seen in the "Build and test Flang" jobs in this PR.

RichBarton-Arm

Looking great Bryan! I like the solution to Options.td preprocessing now, thanks for taking time to do that.

I notice that there are a number of places in the code where the classic flang changes are not guarded with ENABLE_CLASSIC_FLANG Some of those are harmless, but it looks to my eye like some of them need guarding after your changes to Options.td preprocessing. Worth a look before we approve.

RichBarton-Arm · 2022-05-03T17:47:50Z

clang/include/clang/Driver/Options.td

@@ -525,7 +525,7 @@ class InternalDriverOpt : Group<internal_driver_Group>,
  Flags<[NoXarchOption, HelpHidden]>;
 def driver_mode : Joined<["--"], "driver-mode=">, Group<internal_driver_Group>,
  Flags<[CoreOption, NoXarchOption, HelpHidden]>,
-  HelpText<"Set the driver mode to either 'gcc', 'g++', 'cpp', or 'cl'">;
+  HelpText<"Set the driver mode to one of: 'gcc', 'g++', 'cpp', 'cl', or 'fortran'">;


Seems like an unnecessary bit of delta in classic flang that could be removed?

Actually I think this change should be upstreamed, but 'fortran' should be replaced with 'flang'.

clang/include/clang/Driver/Options.td

RichBarton-Arm · 2022-05-03T17:59:10Z

clang/include/clang/Driver/Options.td

 }

+#ifdef ENABLE_CLASSIC_FLANG


For the record, I am very happy with the new approach that lets classic flang sit next to llvm flang wrt Options.td.
Sterling work @bryanpkc

clang/include/clang/Driver/ToolChain.h

clang/lib/CodeGen/CGDebugInfo.cpp

clang/lib/Driver/CMakeLists.txt

RichBarton-Arm · 2022-05-03T18:10:18Z

clang/lib/Driver/ToolChains/Clang.cpp

  Args.AddLastArg(CmdArgs, options::OPT_fveclib);
+#endif
+
+  std::string PassRemarkVal(""), PassRemarkOpt("");


I think this whole block also needs an include guard as it uses OPT_Minfo_EQ and friends? So I think this branch currently wouldn't build with -DLLVM_ENABLE_CLASSIC_FLANG=Off

Weird also how this block needs to be in the Clang driver and can't just be in ClassicFlang.cpp

I have guarded the whole block with ENABLE_CLASSIC_FLANG. I will create a follow-up issue to investigate moving this code to a more appropriate location.

RichBarton-Arm · 2022-05-03T18:11:29Z

clang/lib/Driver/ToolChains/ClassicFlang.cpp

-    CommonCmdArgs.push_back("120");
-    CommonCmdArgs.push_back("0x4000");
+    if (!GDwarfArg) // -g without -gdwarf-X produces default (DWARFv4)
+      CommonCmdArgs.push_back("0x1000000");


I'd be very afraid to change default here. Better the devil you know.

clang/lib/Driver/ToolChains/CommonArgs.cpp

Cherry-picked cabccf8f2d00daf1d740b18a1c80e9b5f4593f60.

bryanpkc · 2022-05-05T15:39:22Z

flang-compiler/flang#1244 is needed to fix several AArch64 Flang test cases.

bryanpkc · 2022-05-18T10:58:10Z

@RichBarton-Arm Could you take a look at this again?

RichBarton-Arm

Two comments, but from the clang/driver side I think this merge is good to go with those two addressed. It would be good for someone to also look over the Debug changes here to check they are all legit.

My two comments:

It looks like this commit is not present in this port, but I expected it to be: 89065d4 @pawosm-arm can confirm if that's right.
I left one inline comment also

RichBarton-Arm · 2022-05-19T10:32:07Z

clang/lib/Driver/ToolChains/ClassicFlang.h

+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_Flang_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_Flang_H


Shouldn't this be ..._ClassicFlang_H ?

The commit mentioned by Richard should be in this port.

The commit is not in this port because it is already part of the baseline llvmorg-14.0.1 (commit 26f5643).

The macro has been fixed.

@bryanpkc

This is a combination of cherry-picking the following patches: Commit 82b38d2: [ClassicFlang] Port release_90 changes from flang-compiler/llvm Cherry-picked commit 2085211cfcca70411dc63f0d08763facc8a02090 by Eric Schweitz, resolved merge conflicts, fixed build failures (e.g. adapted CGDebugInfo.cpp to the new API), and fixed the DIGlobalVariable unit tests, which have been broken since commit edfad65eebdf045b050f37380b6b61d673513982. Commit 885dd87e5fdc: [DebugInfo] Removal of DIFortranArrayType and DIFortranSubrange These extensions are no more required after merge of below PR. Commit 5c9b2e0867d5: Modification to incorporate comments from @bryanpkc. Commit 822de2c: [AsmPrinter] Fix redundant names and types A bug was introduced in 82b38d2 while cherry-picking a DIGlobalVariable-related patch. Commit 45a70a8: Port driver changes from release/11x Cherry-picked c51f89679135f84675f492d560ec5535c2000cfe by Varun Jayathirtha from release_90, and resolved merge conflicts. To avoid conflicts with the new Flang, lib/Driver/ToolChains/Flang.{cpp,h} have been renamed to ClassicFlang.{cpp,h}, and the ENABLE_CLASSIC_FLANG macro is introduced to select which incarnation of Flang to build. The macro is set by running CMake with -DLLVM_ENABLE_CLASSIC_FLANG. After merge with LLVM 11: Move flang options to the end of the definitions list. Commit a9a8036: Port Classic Flang to LLVM 13 File changes to TargetLibraryInfo and DebugLocEntry to adapt to the code from release/13.x and make it work. Comment out the changes due a segmentation fault, code need to be reviewed properly once all commits are in Commit fe989b7: Fix -fveclib=PGMATH The use of #ifdef in include/clang/Driver/Options.td was incorrect and unsupported. As a result -fveclib=PGMATH was silently ignored, and in LLVM 12, it causes the invocation to fail. This patch unguards the option so that it is parsed correctly, but lets the FLANG_LLVM_EXTENSIONS macro continue to toggle the feature. Commit 7c224ae: Fix use of classic Flang as preprocessor Commit 8403c83: Merge FLANG_LLVM_EXTENSIONS macro into ENABLE_CLASSIC_FLANG Commit 486741e: Fix test failures when in classic Flang mode Add a new lit feature tag "classic_flang" to select which tests can or cannot be run when the driver is built for classic Flang. Handle LLVM_ENABLE_CLASSIC_FLANG in llvm/cmake/modules/HandleLLVMOptions.cmake instead of clang/CMakeLists.txt so that macro works in both clang and llvm. Commit a10f592: Port Classic Flang to LLVM 13 LLVM port from release_12x to release_13x, changes done in order to make project able to be build. Commit d385321 (partial): Change to Options.td in order to add the correct invocation for ffixed_line_length_VALUE.

Make TableGen respect the ENABLE_CLASSIC_FLANG macro and better separate the driver options that are mutually exclusive. When the macro is defined, do not build LLVM Flang at all.

…lang-compiler#92) * Support for -gdwarf-5 option in Flang driver. Summary: FLANG driver doesnt pass -gdwarf-4/5 to flang1 in form of xbits, while it passes for -gdwarf-2/3 -gdwarf-2 => -x 120 0x200 -gdwarf-3 => -x 120 0x4000 Due to this -gdwarf-5 is never honored and default option -gdwarf-4 is taken. # flang -gdwarf-5 test.f90 # llvm-dwarfdump a.out | grep version 0x00000000: Compile Unit: length = 0x0000008e version = 0x0004 Now 0x1000000/0x2000000 will be passed for -gdwarf-4/5 -gdwarf-4 => -x 120 0x1000000 -gdwarf-5 => -x 120 0x2000000 Testing: - GNU gdb fortran testsuite - check-llvm - check-debuginfo * Flang doenst choose correct dwarf version when multiple -g/-gdwarfN mentioned Summary: When multiple -g/-gdwarfN options are passed together at compile time, flang chooses the least one. Clang/gfortran etc choose the last one. -gdwarf-5 -gdwarf-3 => flang chooses 5 while clang/gfortran choose 3 -gdwarf-5 -g => flang choses the default while clang/gfortran choose 5 Testing: - check-llvm - check-debuginfo * Default dwarf version should be 4 for -g with flang Currently flang dumps dwarf version 2 for -g and 4 for absence of -g ------------------------- $ flang my.f90 $ llvm-dwarfdump a.out | grep version 0x00000000: Compile Unit: length = 0x0000003d version = 0x0004 abbr_offset = 0x0000 addr_size = 0x08 (next unit at 0x00000041) $ flang -g my.f90 $ llvm-dwarfdump a.out | grep version 0x00000000: Compile Unit: length = 0x00000047 version = 0x0002 abbr_offset = 0x0000 addr_size = 0x08 (next unit at 0x0000004b) ------------------------- It should be 4 for -g as it is the case with clang.

This commit is motivated by reducing the merge burden by shrinking the diff between llvm upstream and classic-flang-llvm-project. Outside of Flang, Fortran code is fed through the Compile phase, and the appropriate tooling is picked up through ToolChain::SelectTool. Classic Flang introduced a FortranFrontend, but these days this seems unnecessary. Fortran can go through the same machinery as everything else. * Use the Preprocess phase to preprocess Fortran code. This phase is always combined with the Compile phase. * Use the Compile phase to lower Fortran code to LLVM IR, and use the Backend phase to compile and optimize the IR. These phases are never combined. * Remove FortranFrontendJobClass. * Remove FortranFrontend tool (instead it's just the Flang tool, which in Classic Flang mode is Classic Flang). * Update tests which inspect the output of the Classic Flang tooling, and ensures that the driver does the right thing for various types of inputs. Based on a patch from Peter Waller <peter.waller@arm.com>.

This commit also squashes a number of patches from the release_12x branch: commit 8eaf5ef Author: Michal Paszta <michal.paszta@mobica.com> Date: Wed Nov 4 21:08:29 2020 +0100 Github Actions added to pre-compile artifacts for flang commit d4e2d22 Author: michalpasztamobica <michal.paszta@mobica.com> Date: Fri Jan 22 10:39:07 2021 +0100 Github Actions to build release_11x and release_12x release_100 is still built as it was. Artifacts names include the branch name. commit bfa53aa Author: Michał Janiszewski <janisozaur@users.noreply.github.com> Date: Wed Feb 17 14:41:51 2021 +0100 Enable ccache for GitHub Actions commit 04e9947 Author: michalpasztamobica <michal.paszta@mobica.com> Date: Wed Mar 17 20:27:04 2021 +0100 Allow full path to flang1 and flang2 in classic flang tests. commit 5b60137 Author: michalpasztamobica <michal.paszta@mobica.com> Date: Fri Mar 19 10:41:22 2021 +0100 Remove unnecessary caret from path in classic-flang test commit 52f2e34 Author: michalpasztamobica <michal.paszta@mobica.com> Date: Mon Apr 19 09:54:05 2021 +0200 Remove the builds for gcc-9 and llvm-9 commit f9f54d2 Author: michalpasztamobica <michal.paszta@mobica.com> Date: Thu Apr 29 16:40:35 2021 +0200 Build and test Flang project on PRs commit 89ffbbd Author: michalpasztamobica <michal.paszta@mobica.com> Date: Thu May 6 10:19:41 2021 +0200 Prepare llvm and clang for ARM64 build of Flang Run Dockerfile script on Github's server to prepare a docker image with llvm and clang built and installed for Flang to use when testing code.

For the LLVM 14 port, pass "140" as the driver version to flang2.

Signed-off-by: Itay Bookstein <itay.bookstein@nextsilicon.com>

* -Wsuggest-override for ClassicFlangMacroBuilder::defineMacro * -Wrange-loop-construct when iterating over llvm::opt::Arg::getValues Signed-off-by: Itay Bookstein <itay.bookstein@nextsilicon.com>

Changes to LLVM release_13x to allow it to be built by GitHub. This is a combination of 4 commits by Abraham Tover from the release_13x branch which had duplicate commit messages and overlapping content: c53d8f8 LLVM release_13x CI changes 83c659a Fix release_13x CI dockerfile 5e6e4cb Fix release_13x CI dockerfile fc42794 LLVM release_13x CI changes

-emit-flang-llvm instructs flang to stop after flang2 and dump the LLVM IR. Can be useful for debugging and also would be a useful option for testing flang output more accurately. Signed-off-by: Richard Barton <richard.barton@arm.com>

Add %flang as a tool substitution available in lit tests. This apes the way %clang is defined and adds a $FLANG override in a similar vein. To avoid this being dead code, add a single test to check the flang driver is reporting the correct phases when running under various phase control options. Signed-off-by: Richard Barton <richard.barton@arm.com>

Pass LLVM target features (-mattr strings) to flang to embed in generated .ll files. For normal compilation this won't make much difference as the attributes are passed to clang after flang2 and can be applied there but this is crucial to enable LTO with flang as clang will not apply the attributes when building the flang2 output. libLTO will need to read these out of the object files to apply them. Signed-off-by: Richard Barton <richard.barton@arm.com>

Use existing clang support for uniquifying target feature lists to pass a unique list through to flang.

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

Also fix Dockerfile to install missing updates, and use apt instead of apt-get. Install python-distutils for timeout handling.

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

This patch partially reverts the following commit from an early version of Classic Flang LLVM: flang-compiler/llvm@6866909 When the LoopVectorize.cpp change in that commit is ported to LLVM 14, it causes a failure in the following test: llvm/test/Transforms/LoopVectorize/AArch64/smallest-and-widest-types.ll Reverting the change allows all tests to run cleanly.

Version screen has been erroneously reporting as flang-new since LLVM 12

These CMake variables are used to set python variables in the lit config. As such, they need to bet set with a valid CMake boolean value that is also a valid python boolean value (1, True, etc.) and not one that is not (ON, NO, etc.) to work. This is fragile. Call the LLVM cmake helper function on these two downstream CMake

Signed-off-by: Richard Barton <richard.barton@arm.com>

kiranchandramohan · 2022-06-01T15:03:11Z

ping @shivaramaarao

RichBarton-Arm reviewed Apr 25, 2022

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guy-david reviewed May 1, 2022

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bryanpkc mentioned this pull request May 1, 2022

Enable DWARF 5 in Classic Flang by default #107

Open

bryanpkc force-pushed the release_14x branch 3 times, most recently from ed1ff21 to 243b1e7 Compare May 3, 2022 04:47

RichBarton-Arm reviewed May 3, 2022

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Add DebugInfo tests

5da2c11

Cherry-picked cabccf8f2d00daf1d740b18a1c80e9b5f4593f60.

bryanpkc force-pushed the release_14x branch from 243b1e7 to d1bdb47 Compare May 5, 2022 15:34

bryanpkc mentioned this pull request May 5, 2022

Do we need to handle -Minfo=, -Mneginfo=, -Minfoall, and -Mneginfoall in Clang::ConstructJob? #108

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RichBarton-Arm approved these changes May 19, 2022

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bryanpkc and others added 12 commits May 20, 2022 16:11

[ClassicFlang][Driver] Coexist with LLVM Flang

8ddd980

Make TableGen respect the ENABLE_CLASSIC_FLANG macro and better separate the driver options that are mutually exclusive. When the macro is defined, do not build LLVM Flang at all.

[workflows] Stop using upstream actions and enable OpenMP build

8bf9551

[ClassicFlang][Driver] Correct the LLVM version passed by the Driver

c379c8d

For the LLVM 14 port, pass "140" as the driver version to flang2.

[workflows] Allow pre-compile jobs to be trigerred manually.

b921dd2

[workflows] Add build scripts and make CI use them.

9f828fd

[DebugInfo] Support of -gpubnames in Driver

435536b

[Driver] Support macOS

f5fd40d

[DebugInfo]: Remove dangerous dead function (-Wreturn-stack-address)

d182b91

Signed-off-by: Itay Bookstein <itay.bookstein@nextsilicon.com>

nextsilicon-itay-bookstein and others added 18 commits May 20, 2022 16:14

[ClassicFlang][Driver] Fix warnings

4757c6f

* -Wsuggest-override for ClassicFlangMacroBuilder::defineMacro * -Wrange-loop-construct when iterating over llvm::opt::Arg::getValues Signed-off-by: Itay Bookstein <itay.bookstein@nextsilicon.com>

[workflows] Removing CI test-base for release_100

7a5ee22

[driver] Add -emit-flang-llvm option

3df4dcb

-emit-flang-llvm instructs flang to stop after flang2 and dump the LLVM IR. Can be useful for debugging and also would be a useful option for testing flang output more accurately. Signed-off-by: Richard Barton <richard.barton@arm.com>

[driver] Add regression test

4023232

[workflows] Use GCC 11 in CI builds

a39a0c6

[flang-driver] Uniquify the target_features string

e3f35e5

Use existing clang support for uniquifying target feature lists to pass a unique list through to flang.

[driver] Pass msve-vector-bits to flang as vscale range

10f66f0

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

[Driver][Test] Add more variants to test/Driver/emit-flang-attrs.f90

4cecd6d

[workflows] Modify CI scripts to add more test variants

198a6b2

Also fix Dockerfile to install missing updates, and use apt instead of apt-get. Install python-distutils for timeout handling.

[workflows] Fix Ubuntu20Dockerfile

05e451c

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

[workflows] support GitHub actions for release_14x branch

84ed34d

Fix classic flang version screen

319e7db

Version screen has been erroneously reporting as flang-new since LLVM 12

[NFC] Add missing ENABLE_CLASSIC_FLANG guard.

b33a874

Signed-off-by: Richard Barton <richard.barton@arm.com>

bryanpkc force-pushed the release_14x branch from d1bdb47 to b33a874 Compare May 20, 2022 20:16

bryanpkc requested a review from shivaramaarao May 21, 2022 13:05

pawosm-arm approved these changes May 21, 2022

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shivaramaarao approved these changes Jun 5, 2022

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bryanpkc merged commit b33a874 into flang-compiler:release_14x Jun 7, 2022

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Port Classic Flang to LLVM 14 #106

Port Classic Flang to LLVM 14 #106

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Port Classic Flang to LLVM 14 #106

Port Classic Flang to LLVM 14 #106

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