| Commit message (Collapse) | Author | Age | Files | Lines |
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This was achieved with
git ls-tree --name-only HEAD -r | xargs sed -i -e 's/note \[/Note \[/g'
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directory.
We want to always use the old path (~/.ghc/..) if it exists.
But we never want to create the old path.
This ensures that the migration can eventually be completed once older GHC
versions are no longer in circulation.
Fixes #20684, #20669, #20660
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Part of #20889
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The documentation states that the interactive flags should be use for
any interactive expressions. The interactive flags are used when
typechecking these expressions but not when printing. The session flags
(modified by :set) are only used when loading a module.
Fixes #20909
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Multiple home units allows you to load different packages which may depend on
each other into one GHC session. This will allow both GHCi and HLS to support
multi component projects more naturally.
Public Interface
~~~~~~~~~~~~~~~~
In order to specify multiple units, the -unit @⟨filename⟩ flag
is given multiple times with a response file containing the arguments for each unit.
The response file contains a newline separated list of arguments.
```
ghc -unit @unitLibCore -unit @unitLib
```
where the `unitLibCore` response file contains the normal arguments that cabal would pass to `--make` mode.
```
-this-unit-id lib-core-0.1.0.0
-i
-isrc
LibCore.Utils
LibCore.Types
```
The response file for lib, can specify a dependency on lib-core, so then modules in lib can use modules from lib-core.
```
-this-unit-id lib-0.1.0.0
-package-id lib-core-0.1.0.0
-i
-isrc
Lib.Parse
Lib.Render
```
Then when the compiler starts in --make mode it will compile both units lib and lib-core.
There is also very basic support for multiple home units in GHCi, at the
moment you can start a GHCi session with multiple units but only the
:reload is supported. Most commands in GHCi assume a single home unit,
and so it is additional work to work out how to modify the interface to
support multiple loaded home units.
Options used when working with Multiple Home Units
There are a few extra flags which have been introduced specifically for
working with multiple home units. The flags allow a home unit to pretend
it’s more like an installed package, for example, specifying the package
name, module visibility and reexported modules.
-working-dir ⟨dir⟩
It is common to assume that a package is compiled in the directory
where its cabal file resides. Thus, all paths used in the compiler
are assumed to be relative to this directory. When there are
multiple home units the compiler is often not operating in the
standard directory and instead where the cabal.project file is
located. In this case the -working-dir option can be passed which
specifies the path from the current directory to the directory the
unit assumes to be it’s root, normally the directory which contains
the cabal file.
When the flag is passed, any relative paths used by the compiler are
offset by the working directory. Notably this includes -i and
-I⟨dir⟩ flags.
-this-package-name ⟨name⟩
This flag papers over the awkward interaction of the PackageImports
and multiple home units. When using PackageImports you can specify
the name of the package in an import to disambiguate between modules
which appear in multiple packages with the same name.
This flag allows a home unit to be given a package name so that you
can also disambiguate between multiple home units which provide
modules with the same name.
-hidden-module ⟨module name⟩
This flag can be supplied multiple times in order to specify which
modules in a home unit should not be visible outside of the unit it
belongs to.
The main use of this flag is to be able to recreate the difference
between an exposed and hidden module for installed packages.
-reexported-module ⟨module name⟩
This flag can be supplied multiple times in order to specify which
modules are not defined in a unit but should be reexported. The
effect is that other units will see this module as if it was defined
in this unit.
The use of this flag is to be able to replicate the reexported
modules feature of packages with multiple home units.
Offsetting Paths in Template Haskell splices
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When using Template Haskell to embed files into your program,
traditionally the paths have been interpreted relative to the directory
where the .cabal file resides. This causes problems for multiple home
units as we are compiling many different libraries at once which have
.cabal files in different directories.
For this purpose we have introduced a way to query the value of the
-working-dir flag to the Template Haskell API. By using this function we
can implement a makeRelativeToProject function which offsets a path
which is relative to the original project root by the value of
-working-dir.
```
import Language.Haskell.TH.Syntax ( makeRelativeToProject )
foo = $(makeRelativeToProject "./relative/path" >>= embedFile)
```
> If you write a relative path in a Template Haskell splice you should use the makeRelativeToProject function so that your library works correctly with multiple home units.
A similar function already exists in the file-embed library. The
function in template-haskell implements this function in a more robust
manner by honouring the -working-dir flag rather than searching the file
system.
Closure Property for Home Units
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For tools or libraries using the API there is one very important closure
property which must be adhered to:
> Any dependency which is not a home unit must not (transitively) depend
on a home unit.
For example, if you have three packages p, q and r, then if p depends on
q which depends on r then it is illegal to load both p and r as home
units but not q, because q is a dependency of the home unit p which
depends on another home unit r.
If you are using GHC by the command line then this property is checked,
but if you are using the API then you need to check this property
yourself. If you get it wrong you will probably get some very confusing
errors about overlapping instances.
Limitations of Multiple Home Units
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
There are a few limitations of the initial implementation which will be smoothed out on user demand.
* Package thinning/renaming syntax is not supported
* More complicated reexports/renaming are not yet supported.
* It’s more common to run into existing linker bugs when loading a
large number of packages in a session (for example #20674, #20689)
* Backpack is not yet supported when using multiple home units.
* Dependency chasing can be quite slow with a large number of
modules and packages.
* Loading wired-in packages as home units is currently not supported
(this only really affects GHC developers attempting to load
template-haskell).
* Barely any normal GHCi features are supported, it would be good to
support enough for ghcid to work correctly.
Despite these limitations, the implementation works already for nearly
all packages. It has been testing on large dependency closures,
including the whole of head.hackage which is a total of 4784 modules
from 452 packages.
Internal Changes
~~~~~~~~~~~~~~~~
* The biggest change is that the HomePackageTable is replaced with the
HomeUnitGraph. The HomeUnitGraph is a map from UnitId to HomeUnitEnv,
which contains information specific to each home unit.
* The HomeUnitEnv contains:
- A unit state, each home unit can have different package db flags
- A set of dynflags, each home unit can have different flags
- A HomePackageTable
* LinkNode: A new node type is added to the ModuleGraph, this is used to
place the linking step into the build plan so linking can proceed in
parralel with other packages being built.
* New invariant: Dependencies of a ModuleGraphNode can be completely
determined by looking at the value of the node. In order to achieve
this, downsweep now performs a more complete job of downsweeping and
then the dependenices are recorded forever in the node rather than
being computed again from the ModSummary.
* Some transitive module calculations are rewritten to use the
ModuleGraph which is more efficient.
* There is always an active home unit, which simplifies modifying a lot
of the existing API code which is unit agnostic (for example, in the
driver).
The road may be bumpy for a little while after this change but the
basics are well-tested.
One small metric increase, which we accept and also submodule update to
haddock which removes ExtendedModSummary.
Closes #10827
-------------------------
Metric Increase:
MultiLayerModules
-------------------------
Co-authored-by: Fendor <power.walross@gmail.com>
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In 806e49ae the package imports refactoring code was modified to rename
package imports. There was a small oversight which meant the code didn't
account for module visibility. This patch fixes that oversight.
In general the "lookupPackageName" function is unsafe to use as it
doesn't account for package visiblity/thinning/renaming etc, there is
just one use in the compiler which would be good to audit.
Fixes #20779
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- Change the dumpPrefix to FilePath, and default to non-module
- Add dot to seperate dump-file-prefix and suffix
- Modify user guide to introduce how dump files are named
- This commit does not affect Ghci dump file naming.
See also #17500
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* Remove `getTag_RDR` (unused), `tidyKind` and `tidyOpenKind`
(already available as `tidyType` and `tidyOpenType`)
* Remove Note [Explicit Case Statement for Specificity].
Since 0a709dd9876e40 we require GHC 8.10 for bootstrapping.
* Change the warning to `cmpAltCon` to a panic.
This shouldn't happen. If it ever does, the code was wrong anyway:
it shouldn't always return `LT`, but rather `LT` in one case
and `GT` in the other case.
* Rename `verifyLinearConstructors` to `verifyLinearFields`
* Fix `Note [Local record selectors]` which was not referenced
* Remove vestiges of `type +v`
* Minor fixes to StaticPointers documentation, part of #15603
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This is a preliminary refactoring for #14335 (supporting plugins in
cross-compilers). In many places the home-unit must be optional because
there won't be one available in the plugin environment (we won't be
compiling anything in this environment). Hence we replace "HomeUnit"
with "Maybe HomeUnit" in a few places and we avoid the use of
"hsc_home_unit" (which is partial) in some few others.
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Currently in GHCi, when given a line of user input we:
1. Attempt to parse and handle it as a statement
2. Otherwise, attempt to parse and handle a single import
3. Otherwise, check if there are imports present (and if so display an error message)
4. Otherwise, attempt to parse a module and only handle the declarations
This patch simplifies the process to:
Attempt to parse and handle it as a statement
Otherwise, attempt to parse a module and handle the imports and declarations
This means that multiple imports in a multiline are now accepted, and a multiline containing both imports and declarations is now accepted (as well as when separated by semicolons).
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As GHC has become target agnostic, we've left behind some now-useless
logic in both build systems.
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Use an (Raw)PkgQual datatype instead of `Maybe FastString` to represent
package imports. Factorize the code that renames RawPkgQual into PkgQual
in function `rnPkgQual`. Renaming consists in checking if the FastString
is the magic "this" keyword, the home-unit unit-id or something else.
Bump haddock submodule
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In the old days the old HPT was used as an interface file cache when
using ghci. The HPT is a `ModuleEnv HomeModInfo` and so if you were
using hs-boot files then the interface file from compiling the .hs file
would be present in the cache but not the hi-boot file. This used to be
ok, because the .hi file used to just be a better version of the
.hi-boot file, with more information so it was fine to reuse it. Now the
source hash of a module is kept track of in the interface file and the
source hash for the .hs and .hs-boot file are correspondingly different
so it's no longer safe to reuse an interface file.
I took the decision to move the cache management of interface files to
GHCi itself, and provide an API where `load` can be provided with a list
of interface files which can be used as a cache. An alternative would be
to manage this cache somewhere in the HscEnv but it seemed that an API
user should be responsible for populating and suppling the cache rather
than having it managed implicitly.
Fixes #20217
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This commit fixes the following bug: when `outputHi` is set, and
both `.dyn_hi` and `.hi` are needed, both would be written to
`outputHi`, causing `.dyn_hi` to overwrite `.hi`. This causes
subsequent `readIface` to fail - "mismatched interface file profile
tag (wanted "", got "dyn")" - triggering unnecessary rebuild.
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- Fix markup in 9.4 release notes
- Document -ddump-cs-trace
- Mention that ImpredicativeTypes is really supported only since 9.2
- Remove "There are some restrictions on the use of unboxed tuples".
This used to be a list, but all those restrictions were removed.
- Mark -fimplicit-import-qualified as documented
- Remove "The :main and :run command" - duplicated verbatim in options
- Avoid calling "main" a function (cf. #7816)
- Update System.getArgs: the old location was before hierarchical modules
- Note that multiplicity multiplication is not supported (#20319)
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Updates haskeline submodule
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As described in #18011, this mode provides similar functionality to the
`runhaskell` command, but doesn't require that the user know the path of
yet another executable, simplifying interactions with upstream tools.
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getProgName was used to append the name of the program (e.g. "ghc") to
printed error messages in the Show instance of GhcException. It doesn't
belong here as GHCi and GHC API users may want to override this behavior
by setting a different error handler. So we now call it in the
defaultErrorHandler instead.
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This patch converts the runPipeline function to be implemented in terms
of a free monad rather than the previous CompPipeline.
The advantages of this are three-fold:
1. Different parts of the pipeline can return different results, the
limits of runPipeline were being pushed already by !5555, this opens up
futher fine-grainedism of the pipeline.
2. The same mechanism can be extended to build-plan at the module level
so the whole build plan can be expressed in terms of one computation
which can then be treated uniformly.
3. The pipeline monad can now be interpreted in different ways, for
example, you may want to interpret the `TPhase` action into the monad
for your own build system (such as shake). That bit will probably
require a bit more work, but this is a step in the right directin.
There are a few more modules containing useful functions for interacting
with the pipelines.
* GHC.Driver.Pipeline: Functions for building pipelines at a high-level
* GHC.Driver.Pipeline.Execute: Functions for providing the default
interpretation of TPhase, in terms of normal IO.
* GHC.Driver.Pipeline.Phases: The home for TPhase, the typed phase data
type which dictates what the phases are.
* GHC.Driver.Pipeline.Monad: Definitions to do with the TPipelineClass
and MonadUse class.
Hooks consumers may notice the type of the `phaseHook` has got
slightly more restrictive, you can now no longer control the
continuation of the pipeline by returning the next phase to execute but
only override individual phases. If this is a problem then please open
an issue and we will work out a solution.
-------------------------
Metric Decrease:
T4029
-------------------------
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Fixes #20042
Signed-off-by: Emily Martins <emily.flakeheart@gmail.com>
Signed-off-by: Hécate Moonlight <hecate@glitchbra.in>
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Use DiagOpts for diagnostic options instead of directly querying
DynFlags (#17957).
Surprising performance improvements on CI:
T4801(normal) ghc/alloc 313236344.0 306515216.0 -2.1% GOOD
T9961(normal) ghc/alloc 384502736.0 380584384.0 -1.0% GOOD
ManyAlternatives(normal) ghc/alloc 797356128.0 786644928.0 -1.3%
ManyConstructors(normal) ghc/alloc 4389732432.0 4317740880.0 -1.6%
T783(normal) ghc/alloc 408142680.0 402812176.0 -1.3%
Metric Decrease:
T4801
T9961
T783
ManyAlternatives
ManyConstructors
Bump haddock submodule
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`GHC.Hs.Syn.Type`
The existing `hsPatType`, `hsLPatType` and `hsLitType` functions have also been
moved to this module
This is a less ambitious take on the same problem that !2182 and !3866
attempt to solve. Rather than have the `hsExprType` function attempt to
efficiently compute the `Type` of every subexpression in an `HsExpr`, this
simply computes the overall `Type` of a single `HsExpr`.
- Explicitly forbids the `SplicePat` `HsIPVar`, `HsBracket`, `HsRnBracketOut`
and `HsTcBracketOut` constructors during the typechecking phase by using
`Void` as the TTG extension field
- Also introduces `dataConCantHappen` as a domain specific alternative to `absurd`
to handle cases where the TTG extension points forbid a constructor.
- Turns HIE file generation into a pure function that doesn't need access to the
`DsM` monad to compute types, but uses `hsExprType` instead.
- Computes a few more types during HIE file generation
- Makes GHCi's `:set +c` command also use `hsExprType` instead of going through
the desugarer to compute types.
Updates haddock submodule
Co-authored-by: Zubin Duggal <zubin.duggal@gmail.com>
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Introduce LogFlags as a independent subset of DynFlags used for logging.
As a consequence in many places we don't have to pass both Logger and
DynFlags anymore.
The main reason for this refactoring is that I want to refactor the
systools interfaces: for now many systools functions use DynFlags both
to use the Logger and to fetch their parameters (e.g. ldInputs for the
linker). I'm interested in refactoring the way they fetch their
parameters (i.e. use dedicated XxxOpts data types instead of DynFlags)
for #19877. But if I did this refactoring before refactoring the Logger,
we would have duplicate parameters (e.g. ldInputs from DynFlags and
linkerInputs from LinkerOpts). Hence this patch first.
Some flags don't really belong to LogFlags because they are subsystem
specific (e.g. most DumpFlags). For example -ddump-asm should better be
passed in NCGConfig somehow. This patch doesn't fix this tight coupling:
the dump flags are part of the UI but they are passed all the way down
for example to infer the file name for the dumps.
Because LogFlags are a subset of the DynFlags, we must update the former
when the latter changes (not so often). As a consequence we now use
accessors to read/write DynFlags in HscEnv instead of using `hsc_dflags`
directly.
In the process I've also made some subsystems less dependent on DynFlags:
- CmmToAsm: by passing some missing flags via NCGConfig (see new fields
in GHC.CmmToAsm.Config)
- Core.Opt.*:
- by passing -dinline-check value into UnfoldingOpts
- by fixing some Core passes interfaces (e.g. CallArity, FloatIn)
that took DynFlags argument for no good reason.
- as a side-effect GHC.Core.Opt.Pipeline.doCorePass is much less
convoluted.
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This also demotes the error message about -fkeep-going to a trace
message which matches the behaviour of other build systems (such as
cabal-install and nix) which don't print any message like this on a
failure.
We want to remove the stable module check in a future patch, which is an
approximation of `-fkeep-going`. At the moment this change shouldn't do
very much.
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This patch fixes a space leak related to the use of
Maybe in RealSrcSpan by introducing a strict variant
of Maybe.
In addition to that, it also introduces a strict pair
and uses the newly introduced strict data types in a few
other places (e.g. the lexer/parser state) to reduce
allocations.
Includes a regression test.
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Replace uses of WARN macro with calls to:
warnPprTrace :: Bool -> SDoc -> a -> a
Remove the now unused HsVersions.h
Bump haddock submodule
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fixes #19757
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1. `text` is as efficient as `ptext . sLit` thanks to the rewrite rules
2. `text` is visually nicer than `ptext . sLit`
3. `ptext . sLit` encourages using one `ptext` for several `sLit` as in:
ptext $ case xy of
... -> sLit ...
... -> sLit ...
which may allocate SDoc's TextBeside constructors at runtime instead
of sharing them into CAFs.
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This commit adds GhcMessage and ancillary (PsMessage, TcRnMessage, ..)
types.
These types will be expanded to represent more errors generated
by different subsystems within GHC. Right now, they are underused,
but more will come in the glorious future.
See
https://gitlab.haskell.org/ghc/ghc/-/wikis/Errors-as-(structured)-values
for a design overview.
Along the way, lots of other things had to happen:
* Adds Semigroup and Monoid instance for Bag
* Fixes #19746 by parsing OPTIONS_GHC pragmas into Located Strings.
See GHC.Parser.Header.toArgs (moved from GHC.Utils.Misc, where it
didn't belong anyway).
* Addresses (but does not completely fix) #19709, now reporting
desugarer warnings and errors appropriately for TH splices.
Not done: reporting type-checker warnings for TH splices.
* Some small refactoring around Safe Haskell inference, in order
to keep separate classes of messages separate.
* Some small refactoring around initDsTc, in order to keep separate
classes of messages separate.
* Separate out the generation of messages (that is, the construction
of the text block) from the wrapping of messages (that is, assigning
a SrcSpan). This is more modular than the previous design, which
mixed the two.
Close #19746.
This was a collaborative effort by Alfredo di Napoli and
Richard Eisenberg, with a key assist on #19746 by Iavor
Diatchki.
Metric Increase:
MultiLayerModules
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Since d880d6b2e48268f5ed4d3eb751fe24cc833e9221 the parsing of the
environment files was moved to `parseDynamicFlags`, under the assumption
it was typically only called once. It turns out not to be true in GHCi
and this led to continually reparsing the environment file whenever a
new option was set, the options were appended to the package state and
hence all packages reloaded, as it looked like the options were changed.
The simplest fix seems to be a clearer specification:
> Package environment files are only loaded in GHCi during initialisation.
Fixes #19650
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It isn't used for anything anymore
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There used to be some cases were kinds were not generalised properly
before being printed in GHCi. This seems to have changed in the past so
now it's uncessary to tidy before printing out the test case.
```
> :set -XPolyKinds
> data A x y
> :k A
k1 -> k2 -> A
```
This tidying was causing issues with an attempt to increase sharing by
making `mkTyConApp` (see !4762)
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Other than that:
* Fix T16167,json,json2,T7478,T10637 tests to reflect the introduction of
the `MessageClass` type
* Remove `makeIntoWarning`
* Remove `warningsToMessages`
* Refactor GHC.Tc.Errors
1. Refactors GHC.Tc.Errors so that we use `DiagnosticReason` for "choices"
(defer types errors, holes, etc);
2. We get rid of `reportWarning` and `reportError` in favour of a general
`reportDiagnostic`.
* Introduce `DiagnosticReason`, `Severity` is an enum: This big commit makes
`Severity` a simple enumeration, and introduces the concept of `DiagnosticReason`,
which classifies the /reason/ why we are emitting a particular diagnostic.
It also adds a monomorphic `DiagnosticMessage` type which is used for
generic messages.
* The `Severity` is computed (for now) from the reason, statically.
Later improvement will add a `diagReasonSeverity` function to compute
the `Severity` taking `DynFlags` into account.
* Rename `logWarnings` into `logDiagnostics`
* Add note and expand description of the `mkHoleError` function
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In the future, we want `HscEnv` to support multiple home units
at the same time. This means, that there will be 'Target's that do
not belong to the current 'HomeUnit'.
This is an API change without changing behaviour.
Update haddock submodule to incorporate API changes.
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Bumps Win32 submodule.
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* Make NameCache the mutable one and replace NameCacheUpdater with it
* Remove NameCache related code duplicated into haddock
Bump haddock submodule
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The loader state was stored into HscEnv. As we need to have two
interpreters and one loader state per interpreter in #14335, it's
natural to make the loader state a field of the Interp type.
As a side effect, many functions now only require a Interp parameter
instead of HscEnv. Sadly we can't fully free GHC.Linker.Loader of HscEnv
yet because the loader is initialised lazily from the HscEnv the first
time it is used. This is left as future work.
HscEnv may not contain an Interp value (i.e. hsc_interp :: Maybe Interp).
So a side effect of the previous side effect is that callers of the
modified functions now have to provide an Interp. It is satisfying as it
pushes upstream the handling of the case where HscEnv doesn't contain an
Interpreter. It is better than raising a panic (less partial functions,
"parse, don't validate", etc.).
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Metric Increase:
T10370
parsing001
Updates haddock submodule
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* Implement new debugger command `:ignore` to set an `ignore count`
for a specified breakpoint.
* Allow new optional parameter on `:continue` command to set an
`ignore count` for the current breakpoint.
* In the Interpreter replace the current `Word8` BreakArray with
an `Int` array.
* Change semantics of values in `BreakArray` to:
n < 0 : Breakpoint is disabled.
n == 0 : Breakpoint is enabled.
n > 0 : Breakpoint is enabled, but ignore next `n` iterations.
* Rewrite `:enable`/`:disable` processing as a special case of `:ignore`.
* Remove references to `BreakArray` from `ghc/UI.hs`.
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This adds support for -XGHC2021, as described in Proposal 0380 [1].
[1] https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0380-ghc2021.rst
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