[Git][ghc/ghc][wip/nfdata-forcing] 11 commits: iface: Store flags in interface files

Matthew Pickering (@mpickering) gitlab at gitlab.haskell.org
Mon Mar 10 08:48:04 UTC 2025 


Matthew Pickering pushed to branch wip/nfdata-forcing at Glasgow Haskell Compiler / GHC


Commits:
44bf5fa1 by Matthew Pickering at 2025-03-07T13:48:18+00:00
iface: Store flags in interface files

When reporting the reason why a module is recompiled (using
`-dump-hi-diffs`), it is much more informative to inform the user about
which flag exactly has changed, rather than just an opaque reference to
a hash.

Now, when the user enables `-fwrite-if-self-recomp-flags`
there is a difference the precise part of the flags is
reported:

```
codegen flags changed:
before: [Opt_NoTypeableBinds, Opt_OmitYields]
after: [Opt_NoTypeableBinds, Opt_OmitYields, Opt_DictsStrict]
```

Fixes #25571

- - - - -
324222bd by Oleg Grenrus at 2025-03-08T08:50:18-05:00
Run fix-whitespace on compiler/

https://hackage.haskell.org/package/fix-whitespace

IMO this should be included into lint suite

- - - - -
1e53277a by sheaf at 2025-03-08T16:32:25-05:00
Allow defaulting of representational equalities

This commit generalises the defaulting of equality constraints that
was introduced in 663daf8d (with follow-up in 6863503c) to allow
the defaulting of *representational* equality constraints.

Now we default a representational equality

  ty1 ~R# ty2

by unifying ty1 ~# ty2.

This allows the following defaulting to take place:

  - Coercible alpha[tau] Int ==> alpha := Int
  - Coercible (IO beta[tau]) (IO Char) ==> beta := Char

See Note [Defaulting representational equalities] in GHC.Tc.Solver.Default
for more details.

Fixes #21003

- - - - -
d6c40afc by Andreas Klebinger at 2025-03-08T16:33:02-05:00
Revert "Use `Infinite` in unique generation, and clean up some other partial uni patterns as well."

This reverts commit 643dd3d86968c527ba07ece9cc337728dbdfe2a0.

As described in #25817 this commit introduced a subtle bug in AArch64
code generation. So for the time being I will simply revert it
wholesale.

- - - - -
68310e11 by Andreas Klebinger at 2025-03-08T16:33:39-05:00
Properly describe acceptance window for stat tests.

The relative metric is already in %, so no need to multiply by 100.

- - - - -
cca68421 by Cheng Shao at 2025-03-08T22:04:42-05:00
wasm: do not use wasm type reflection in dyld

The wasm dynamic linker used to depend on v8's experimental wasm type
reflection support to generate stub functions when treating GOT.func
items that aren't exported by any loaded library yet. However, as we
work towards wasm ghci browser mode (#25399), we need to ensure the
wasm dyld logic is portable across browsers. So this commit removes
the usage of wasm type reflection in wasm dyld, and it shall only be
added many months later when this feature is widely available in
browsers.

- - - - -
75fcc5c9 by Cheng Shao at 2025-03-08T22:05:19-05:00
wasm: don't create a wasm global for dyld poison

There's a much more efficient way to convert an unsigned i32 to a
signed one. Thanks, o3-mini-high.

- - - - -
fd40eaa1 by Cheng Shao at 2025-03-08T22:05:19-05:00
wasm: revamp JSFFI internal implementation and documentation

This patch revamps the wasm backend's JSFFI internal implementation
and documentation:

- `JSValManager` logic to allocate a key is simplified to simple
  bumping. According to experiments with all major browsers, the
  internal `Map` would overflow the heap much earlier before we really
  exhaust the 32-bit key space, so there's no point in the extra
  complexity.
- `freeJSVal` is now idempotent and safe to call more than once. This
  is achieved by attaching the `StablePtr#` to the `JSVal#` closure
  and nullifying it when calling `freeJSVal`, so the same stable
  pointer cannot be double freed.
- `mkWeakJSVal` no longer exposes the internal `Weak#` pointer and
  always creates a new `Weak#` on the fly. Otherwise by finalizing
  that `Weak#`, user could accidentally drop the `JSVal`, but
  `mkWeakJSVal` is only supposed to create a `Weak` that observes the
  `JSVal`'s liveliness without actually interfering it.
- `PromisePendingException` is no longer exported since it's never
  meant to be caught by user code; it's a severe bug if it's actually
  raised at runtime.
- Everything exported by user-facing `GHC.Wasm.Prim` now has proper
  haddock documentation.
- Note [JSVal representation for wasm] has been updated to reflect the
  new JSVal# memory layout.

- - - - -
759aa06c by Matthew Pickering at 2025-03-10T08:47:56+00:00
Remove mi_used_th field from interface files

In the distant past, recompilation checking was disabled for interfaces which used
TemplateHaskell, but for several years now recompilation checking has
been more fine-grained. This has rendered this field unused and
lingering in an interface file.

- - - - -
efdf5e79 by Matthew Pickering at 2025-03-10T08:47:56+00:00
Remove mi_hpc field from interface files

The `mi_hpc` field is not used for anything as far as I can discern so
there is no reason to record in the private interface of a module that
there are modules in the transitive closure which use `hpc`.

You can freely mix modules which use `-fhpc` and ones which don't.

Whether to recompile a module due to `-fhpc` being passed to the module
itself is determined in `fingerprintDynFlags`.

- - - - -
d26a9ab1 by Matthew Pickering at 2025-03-10T08:47:57+00:00
interfaces: Ensure that forceModIface deeply forces a ModIface

A ModIface is the result of compilation that we keep for a long time on
disk. Therefore, it's very important to manage what we are going to
retain and remove any external references to things which we might have
captured compilation.

If storing your ModIface in memory usages too much space, then store
less things or make it use a more efficient representation.

In the past there have been many space leak bugs by not sufficiently
forcing a ModIface.

This patch adds all the missing NFData instances for all the places I
could find where we weren't deeply forcing the structure.

- - - - -


108 changed files:

- compiler/GHC.hs
- compiler/GHC/Cmm/CallConv.hs
- compiler/GHC/Cmm/Liveness.hs
- compiler/GHC/Cmm/ThreadSanitizer.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
- compiler/GHC/CmmToAsm/X86/RegInfo.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/LateCC/TopLevelBinds.hs
- compiler/GHC/Core/Opt/CallerCC/Types.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify/Utils.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/Graph/Color.hs
- compiler/GHC/Data/Strict.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Flags.hs
- + compiler/GHC/Driver/IncludeSpecs.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Specificity.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/Iface/Env.hs
- + compiler/GHC/Iface/Flags.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Recomp/Flags.hs
- compiler/GHC/Iface/Recomp/Types.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/JS/Opt/Expr.hs
- compiler/GHC/JS/Opt/Simple.hs
- compiler/GHC/Platform/LoongArch64.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToCmm/TagCheck.hs
- compiler/GHC/Tc/Errors/Hole/FitTypes.hs
- compiler/GHC/Tc/Errors/Hole/Plugin.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/TcRef.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Types/Annotations.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/CostCentre.hs
- compiler/GHC/Types/CostCentre/State.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/HpcInfo.hs
- compiler/GHC/Types/Id.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Types/PkgQual.hs
- compiler/GHC/Types/ProfAuto.hs
- compiler/GHC/Types/SafeHaskell.hs
- compiler/GHC/Types/SourceFile.hs
- compiler/GHC/Types/SptEntry.hs
- compiler/GHC/Types/SrcLoc.hs
- compiler/GHC/Types/Unique/Supply.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/ModGuts.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Unique.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/ghc.cabal.in
- docs/users_guide/9.14.1-notes.rst
- docs/users_guide/phases.rst
- docs/users_guide/wasm.rst
- libraries/ghc-boot/GHC/Serialized.hs
- libraries/ghc-experimental/src/GHC/Wasm/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Flag.hs
- libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
- rts/wasm/JSFFI.c
- rts/wasm/jsval.cmm
- testsuite/driver/perf_notes.py
- testsuite/tests/count-deps/CountDepsAst.stdout
- testsuite/tests/count-deps/CountDepsParser.stdout
- testsuite/tests/default/default-fail08.hs
- testsuite/tests/default/default-fail08.stderr
- testsuite/tests/jsffi/jsffigc.hs
- testsuite/tests/rep-poly/T14561b.stderr
- testsuite/tests/rep-poly/UnliftedNewtypesCoerceFail.stderr
- + testsuite/tests/typecheck/should_compile/T21003.hs
- testsuite/tests/typecheck/should_compile/all.T
- testsuite/tests/typecheck/should_fail/T10495.hs
- testsuite/tests/typecheck/should_fail/T10495.stderr
- utils/haddock/haddock-api/src/Haddock/Types.hs
- utils/jsffi/dyld.mjs
- utils/jsffi/prelude.mjs


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/c84e65f4b0b4c70fb822ced556089711a3eaceec...d26a9ab17c42d72c71e864948ec9c6a8e012e59d

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/c84e65f4b0b4c70fb822ced556089711a3eaceec...d26a9ab17c42d72c71e864948ec9c6a8e012e59d
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