[Git][ghc/ghc][wip/recomp-mhu-fixes] 9 commits: Fix recompilation checking for multiple home units

Tue Dec 27 15:03:45 UTC 2022

Matthew Pickering pushed to branch wip/recomp-mhu-fixes at Glasgow Haskell Compiler / GHC

Commits:
55742e93 by Matthew Pickering at 2022-12-27T15:02:58+00:00
Fix recompilation checking for multiple home units

The key part of this change is to store a UnitId in the
`UsageHomeModule` and `UsageHomeModuleInterface`.

* Fine-grained dependency tracking is used if the dependency comes from
  any home unit.
* We actually look up the right module when checking whether we need to
  recompile in the `UsageHomeModuleInterface` case.

These scenarios are both checked by the new tests (
multipleHomeUnits_recomp and multipleHomeUnits_recomp_th )

Fixes #22675

- - - - -
42c793f3 by Matthew Pickering at 2022-12-27T15:03:02+00:00
Augment target filepath by working directory when checking if module satisfies target

This fixes a spurious warning in -Wmissing-home-modules.

This is a simple oversight where when looking for the target in the
first place we augment the search by the -working-directory flag but
then fail to do so when checking this warning.

Fixes #22676

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cece0e06 by Matthew Pickering at 2022-12-27T15:03:02+00:00
Use NodeKey rather than ModuleName in pruneCache

The `pruneCache` function assumes that the list of `CachedInfo` all have unique `ModuleName`, this is not true:

* In normal compilation, the same module name can appear for a file and it's boot file.
* In multiple home unit compilation the same ModuleName can appear in different units

The fix is to use a `NodeKey` as the actual key for the interfaces which includes `ModuleName`, `IsBoot` and `UnitId`.

Fixes #22677

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0941994e by Matthew Pickering at 2022-12-27T15:03:02+00:00
Recompilation checking: Don't try to find artefacts for Interactive & hs-boot combo

In interactive mode we don't produce any linkables for hs-boot files. So
we also need to not going looking for them when we check to see if we
have all the right objects needed for recompilation.

Ticket #22669

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e7e0eda0 by Matthew Pickering at 2022-12-27T15:03:02+00:00
Don't write o-boot files in Interactive mode

We should not be producing object files when in interactive mode but we
still produced the dummy o-boot files. These never made it into a
`Linkable` but then confused the recompilation checker.

Fixes #22669

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380054df by Matthew Pickering at 2022-12-27T15:03:02+00:00
Improve driver diagnostic messages by including UnitId in message

Currently the driver diagnostics don't give any indication about which unit they correspond to.

For example `-Wmissing-home-modules` can fire multiple times for each different home unit and gives no indication about which unit it's actually reporting about.

Perhaps a longer term fix is to generalise the providence information away from a SrcSpan so that these kind of whole project errors can be reported with an accurate provenance. For now we can just include the `UnitId` in the error message.

Fixes #22678

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230ec8b0 by Matthew Pickering at 2022-12-27T15:03:02+00:00
Key ModSummary cache by UnitId as well as FilePath

Multiple units can refer to the same files without any problem. Just
another assumption which needs to be updated when we may have multiple
home units.

However, there is the invariant that within each unit each file only
maps to one module, so as long as we also key the cache by UnitId then
we are all good.

This led to some confusing behaviour in GHCi when reloading,
multipleHomeUnits_shared distils the essence of what can go wrong.

Fixes #22679

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bf02f4d1 by Matthew Pickering at 2022-12-27T15:03:10+00:00
Finder: Look in current unit before looking in any home package dependencies

In order to preserve existing behaviour it's important to look within the current component before consideirng a module might come from an external component.

This already happened by accident in `downsweep`, (because roots are used to repopulated the cache) but in the `Finder` the logic was the wrong way around.

Fixes #22680

-------------------------
Metric Decrease:
    MultiComponentModules
    MultiComponentModulesRecomp
-------------------------p

- - - - -
d9ae156c by Matthew Pickering at 2022-12-27T15:03:29+00:00
Debug: Print full NodeKey when pretty printing ModuleGraphNode

This is helpful when debugging multiple component issues.

- - - - -

30 changed files:

- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Errors/Types.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Unit/Env.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/Graph.hs
- testsuite/tests/driver/Makefile
- + testsuite/tests/driver/T22669.hs
- + testsuite/tests/driver/T22669.hs-boot
- testsuite/tests/driver/all.T
- + testsuite/tests/driver/multipleHomeUnits/A.hs
- + testsuite/tests/driver/multipleHomeUnits/Dep.hs
- testsuite/tests/driver/multipleHomeUnits/Makefile
- + testsuite/tests/driver/multipleHomeUnits/Recomp.hs
- + testsuite/tests/driver/multipleHomeUnits/RecompTH.hs
- testsuite/tests/driver/multipleHomeUnits/all.T
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_import_order.stderr
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_recomp.stdout
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_recomp_th.stdout
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_shared.stderr
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_warnings.stderr
- + testsuite/tests/driver/multipleHomeUnits/order-matters1/A.hs
- + testsuite/tests/driver/multipleHomeUnits/order-matters1/B.hs

The diff was not included because it is too large.

View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/117378b9a101ffad62e7309c851b39a346169225...d9ae156ca6f7ae98dbc01002cdfa7992e58814a8

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/117378b9a101ffad62e7309c851b39a346169225...d9ae156ca6f7ae98dbc01002cdfa7992e58814a8
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