Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC

Commits:

• 575c4bc6
  by Rodrigo Mesquita at 2026-10-05T12:32:02-04:00

  ttg: HsModuleName in the AST, ModuleName in GHC
  
  This commit makes the AST fully independent from GHC by parsing a
  "module name" as an `HsModuleName (= HText)` rather than constructing an
  `ModuleName (= FastString)` straight away.
  
  In the GHC side, everything remains as a `ModuleName`. We turn AST
  `HsModuleName`s into fast strings with the cheap `mkFastStringShortText`
  when we process the AST for manipulation within the compiler.
  
  There are no performance regressions introduced by this approach.
  
  This is the final piece of #21592
  
  Alternative plans were discussed in
  gitlab.haskell.org/ghc/ghc/-/merge_requests/16546#note_694647,
  but the Simon suggested one won in simplicity and performance when
  compared against my attempt at implementing my original plan of having
  a family `ModuleNameP`.
  

• 811dc21b
  by mangoiv at 2026-10-05T13:04:47-04:00

  configure: fix sed script and subst tooldir script
  
  Fixes #27672
  
  Adds sanity checking for SUBST_TOOLDIR
  
  Metric Decrease:
      LinkableUsage01
      MultiLayerModulesTH_OneShot
      T10547
      T12234
      T12425
      T13035
      T13820
      T18140
      T18730
      T18923
      T9198
      TcPlugin_RewritePerf
      mhu-perf
  

• c5dc8554
  by Hannes Siebenhandl at 2026-10-05T13:04:48-04:00

  Prepend in-memory unit database for backpack
  
  The packageDbFlags are stored in reverse order. Thus, prepending will
  ensure that the in-memory unit database is the last item on the unit
  database stack.
  
  Further, the in-memory unit database needs to be able to shadow units
  from earlier unit databases in the unit database stack.
  
  Moreover, a `-clear-package-db` would remove the in-memory database if
  it weren't the last item on the stack.
  
  Closes #27835
  

96 changed files:

• changelog.d/unit-index
• compiler/GHC.hs
• compiler/GHC/Builtin/Modules.hs
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Show.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/Opt/CallerCC/Types.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/Main/Compile.hs
• compiler/GHC/Driver/Pipeline.hs-boot
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Pipeline/Phases.hs
• compiler/GHC/Hs/Doc.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Debug.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/Header.hs
• compiler/GHC/Parser/Lexer.x
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/String.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/ErrCtxt.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/UnresolvedImport.hs
• compiler/GHC/Unit/Home.hs
• compiler/GHC/Unit/Module.hs
• compiler/GHC/Unit/Module/Env.hs
• + compiler/GHC/Unit/Module/Name.hs
• compiler/GHC/Unit/Parser.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Unit/Types.hs-boot
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Module/Name.hs
• compiler/Language/Haskell/Syntax/Text.hs
• compiler/ghc.cabal.in
• distrib/configure.ac.in
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Info.hs
• linters/lint-codes/LintCodes/Static.hs
• m4/subst_tooldir.m4
• + testsuite/tests/backpack/should_compile/T27835.bkp
• + testsuite/tests/backpack/should_compile/T27835.stderr
• testsuite/tests/backpack/should_compile/all.T
• testsuite/tests/count-deps/CountDepsAst.stdout
• testsuite/tests/count-deps/CountDepsParser.stdout
• testsuite/tests/ghc-api/downsweep/IncrementalDownsweep.hs
• testsuite/tests/ghc-api/exactprint/T22919.stderr
• testsuite/tests/ghc-api/exactprint/Test20239.stderr
• testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr
• testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr
• testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr
• testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr
• testsuite/tests/hiefile/should_run/T24544.hs
• testsuite/tests/module/mod185.stderr
• testsuite/tests/parser/should_compile/DumpParsedAst.stderr
• testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr
• testsuite/tests/parser/should_compile/DumpRenamedAst.stderr
• testsuite/tests/parser/should_compile/DumpSemis.stderr
• testsuite/tests/parser/should_compile/KindSigs.stderr
• testsuite/tests/parser/should_compile/T14189.stderr
• testsuite/tests/parser/should_compile/T15323.stderr
• testsuite/tests/parser/should_compile/T20452.stderr
• testsuite/tests/parser/should_compile/T20718.stderr
• testsuite/tests/parser/should_compile/T20718b.stderr
• testsuite/tests/parser/should_compile/T20846.stderr
• testsuite/tests/parser/should_compile/T23315/T23315.stderr
• testsuite/tests/printer/AnnotationNoListTuplePuns.stdout
• testsuite/tests/printer/T18791.stderr
• testsuite/tests/printer/Test20297.stdout
• testsuite/tests/printer/Test24533.stdout
• testsuite/tests/profiling/should_run/caller-cc/CallerCcParser.hs
• utils/check-exact/ExactPrint.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs

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