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I was working on making DynFlags stateless (#17957), especially by
storing loaded plugins into HscEnv instead of DynFlags. It turned out to
be complicated because HscEnv is in GHC.Driver.Types but LoadedPlugin
isn't: it is in GHC.Driver.Plugins which depends on GHC.Driver.Types. I
didn't feel like introducing yet another hs-boot file to break the loop.
Additionally I remember that while we introduced the module hierarchy
(#13009) we talked about splitting GHC.Driver.Types because it contained
various unrelated types and functions, but we never executed. I didn't
feel like making GHC.Driver.Types bigger with more unrelated Plugins
related types, so finally I bit the bullet and split GHC.Driver.Types.
As a consequence this patch moves a lot of things. I've tried to put
them into appropriate modules but nothing is set in stone.
Several other things moved to avoid loops.
* Removed Binary instances from GHC.Utils.Binary for random compiler
things
* Moved Typeable Binary instances into GHC.Utils.Binary.Typeable: they
import a lot of things that users of GHC.Utils.Binary don't want to
depend on.
* put everything related to Units/Modules under GHC.Unit:
GHC.Unit.Finder, GHC.Unit.Module.{ModGuts,ModIface,Deps,etc.}
* Created several modules under GHC.Types: GHC.Types.Fixity, SourceText,
etc.
* Split GHC.Utils.Error (into GHC.Types.Error)
* Finally removed GHC.Driver.Types
Note that this patch doesn't put loaded plugins into HscEnv. It's left
for another patch.
Bump haddock submodule
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- put panic related functions into GHC.Utils.Panic
- put trace related functions using DynFlags in GHC.Driver.Ppr
One step closer making Outputable fully independent of DynFlags.
Bump haddock submodule
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This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Iface.*
- GHC.Llvm.*
- GHC.Rename.*
- GHC.Tc.*
- GHC.HsToCore.*
- GHC.StgToCmm.*
- GHC.CmmToAsm.*
- GHC.Runtime.*
- GHC.Unit.*
- GHC.Utils.*
- GHC.SysTools.*
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In some cases it was possible for lookupGlobalOccRn_maybe to return an
error, when it should be returning a Nothing. If it called
lookupExactOcc_either when there were no matching GlobalRdrElts in the
otherwise case, it would return an error message. This could be caused
when lookupThName_maybe in Template Haskell was looking in different
namespaces (thRdrNameGuesses), guessing different namespaces that the
name wasn't guaranteed to be found in.
However, by addressing this some more accurate errors were being lost in
the conversion to Maybes. So some of the lookup* functions have been
shuffled about so that errors should always be ignored in
lookup*_maybes, and propagated otherwise.
This fixes #18263
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Introduce GHC.Unit.* hierarchy for everything concerning units, packages
and modules.
Update Haddock submodule
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Update Haddock submodule
Metric Increase:
haddock.compiler
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* SysTools
* Parser
* GHC.Builtin
* GHC.Iface.Recomp
* Settings
Update Haddock submodule
Metric Decrease:
Naperian
parsing001
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Update Haddock submodule
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Update Haddock submodule
Metric Increase:
haddock.compiler
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When GHC is parsing a file generated by a tool, e.g. by the C preprocessor, the
tool may insert #line pragmas to adjust the locations reported to the user.
As the result, the locations recorded in RealSrcLoc are not monotonic. Elements
that appear later in the StringBuffer are not guaranteed to have a higher
line/column number.
In fact, there are no guarantees whatsoever, as #line pragmas can arbitrarily
modify locations. This lack of guarantees makes ideas such as #17544
infeasible.
This patch adds an additional bit of information to every SrcLoc:
newtype BufPos = BufPos { bufPos :: Int }
A BufPos represents the location in the StringBuffer, unaffected by any
pragmas.
Updates haddock submodule.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
MultiLayerModules
Naperian
parsing001
T12150
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Before this patch, GHC relied on Ord SrcSpan to identify source elements, by
using SrcSpan as Map keys:
blackList :: Map SrcSpan () -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map SrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
Firstly, this design is not valid in presence of UnhelpfulSpan, as it
distinguishes between UnhelpfulSpan "X" and UnhelpfulSpan "Y", but those
strings are messages for the user, unfit to serve as identifiers for source
elements.
Secondly, this design made it hard to extend SrcSpan with additional data.
Recall that the definition of SrcSpan is:
data SrcSpan =
RealSrcSpan !RealSrcSpan
| UnhelpfulSpan !FastString
Say we want to extend the RealSrcSpan constructor with additional information:
data SrcSpan =
RealSrcSpan !RealSrcSpan !AdditionalInformation
| UnhelpfulSpan !FastString
getAdditionalInformation :: SrcSpan -> AdditionalInformation
getAdditionalInformation (RealSrcSpan _ a) = a
Now, in order for Map SrcSpan to keep working correctly, we must *ignore* additional
information when comparing SrcSpan values:
instance Ord SrcSpan where
compare (RealSrcSpan r1 _) (RealSrcSpan r2 _) = compare r1 r2
...
However, this would violate an important law:
a == b therefore f a == f b
Ignoring AdditionalInformation in comparisons would mean that with
f=getAdditionalInformation, the law above does not hold.
A more robust design is to avoid Ord SrcSpan altogether, which is what this patch implements.
The mappings are changed to use RealSrcSpan instead:
blackList :: Set RealSrcSpan -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map RealSrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
All SrcSpan comparisons are now done with explicit comparison strategies:
SrcLoc.leftmost_smallest
SrcLoc.leftmost_largest
SrcLoc.rightmost_smallest
These strategies are not subject to the law mentioned above and can easily
discard both the string stored in UnhelpfulSpan and AdditionalInformation.
Updates haddock submodule.
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submodule updates: nofib, haddock
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