| Commit message (Collapse) | Author | Age | Files | Lines |
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SourceText is serialized along with INLINE pragmas into interface files. Many of
these SourceTexts are identical, for example "{-# INLINE#". When deserialized,
each such SourceText was previously expanded out into a [Char], which is highly
wasteful of memory, and each such instance of the text would allocate an
independent list with its contents as deserializing breaks any sharing that might
have existed.
Instead, we use a `FastString` to represent these, so that each instance unique
text will be interned and stored in a memory efficient manner.
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This patch adds the req_process predicate to the testsuite to assert
the platform has a process model, also marking tests that involve
spawning processes as req_process. Also bumps hpc & process submodule.
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!9018 brought in exact print annotations in LayoutInfo for open and
close braces at the top level.
But it retained them in the HsModule annotations too.
Remove the originals, so exact printing uses LayoutInfo
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This patch converts all the errors to do with loading interface files
into proper structured diagnostics.
* DriverMessage: Sometimes in the driver we attempt to load an interface
file so we embed the IfaceMessage into the DriverMessage.
* TcRnMessage: Most the time we are loading interface files during
typechecking, so we embed the IfaceMessage
This patch also removes the TcRnInterfaceLookupError constructor which
is superceded by the IfaceMessage, which is now structured compared to
just storing an SDoc before.
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This patch implements a part of GHC Proposal #475.
The key change is in GHC.Tuple.Prim:
- data () = ()
- data (a,b) = (a,b)
- data (a,b,c) = (a,b,c)
...
+ data Unit = ()
+ data Tuple2 a b = (a,b)
+ data Tuple3 a b c = (a,b,c)
...
And the rest of the patch makes sure that Unit and Tuple<n>
are pretty-printed as () and (,,...,,) in various contexts.
Updates the haddock submodule.
Co-authored-by: Vladislav Zavialov <vlad.z.4096@gmail.com>
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Do not apply the heuristic to associate a comment with a prior
declaration for the first declaration in the file.
Closes #22919
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In Parser.y semis1 production triggers for the virtual semi at the end
of the file. This is detected by it being zero length.
In this case, do not extend the span being used to gather comments, so
any final comments are allocated at the module level instead.
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Closes #20951
Closes #19697
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Any comments immediately preceding the first declaration are no longer
kept as header comments, but attach to the first declaration instead.
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* The SourceText of primitive characters 'a'# did not include
the #, unlike for other primitive literals 1#, 1##, 1.0#, 1.0##, "a"#.
We can now remove the function pp_st_suffix, which was a hack
to add the # back.
* Negative primitive literals shouldn't use parentheses, as described in
Note [Printing of literals in Core]. Added a testcase to T14681.
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Add JS backend adapted from the GHCJS project by Luite Stegeman.
Some features haven't been ported or implemented yet. Tests for these
features have been disabled with an associated gitlab ticket.
Bump array submodule
Work funded by IOG.
Co-authored-by: Jeffrey Young <jeffrey.young@iohk.io>
Co-authored-by: Luite Stegeman <stegeman@gmail.com>
Co-authored-by: Josh Meredith <joshmeredith2008@gmail.com>
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This MR implements the idea of #21731 that the printing of a diagnostic
method should be configurable at the printing time.
The interface of the `Diagnostic` class is modified from:
```
class Diagnostic a where
diagnosticMessage :: a -> DecoratedSDoc
diagnosticReason :: a -> DiagnosticReason
diagnosticHints :: a -> [GhcHint]
```
to
```
class Diagnostic a where
type DiagnosticOpts a
defaultDiagnosticOpts :: DiagnosticOpts a
diagnosticMessage :: DiagnosticOpts a -> a -> DecoratedSDoc
diagnosticReason :: a -> DiagnosticReason
diagnosticHints :: a -> [GhcHint]
```
and so each `Diagnostic` can implement their own configuration record
which can then be supplied by a client in order to dictate how to print
out the error message.
At the moment this only allows us to implement #21722 nicely but in
future it is more natural to separate the configuration of how much
information we put into an error message and how much we decide to print
out of it.
Updates Haddock submodule
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GHC tests the exact print annotations using the contents of
utils/check-exact.
The same functionality is provided via
https://github.com/alanz/ghc-exactprint
The latter was updated to ensure it works with all of the files on
hackage when 9.2 was released, as well as updated to ensure users of
the library could work properly (apply-refact, retrie, etc).
This commit brings the changes from ghc-exactprint into
GHC/utils/check-exact, adapting for the changes to master.
Once it lands, it will form the basis for the 9.4 version of
ghc-exactprint.
See also discussion around this process at #21355
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includes corresponding changes to haddock submodule
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Rather than a list of constructors and a `NewOrData` flag, we define `data DataDefnCons a = NewTypeCon a | DataTypeCons [a]`, which enforces a newtype to have exactly one constructor.
Closes #22070.
Bump haddock submodule.
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The testsuite output now contains diagnostic codes, so many tests need
to be updated at once.
We decided it was best to keep the diagnostic codes in the testsuite
output, so that contributors don't inadvertently make changes to the
diagnostic codes.
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Move the GHC-independent definitions from GHC.Hs.ImpExp to
Language.Haskell.Syntax.ImpExp with the required TTG extension fields
such as to keep the AST independent from GHC.
This is progress towards having the haskell-syntax package, as described
in #21592
Bumps haddock submodule
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The code
data instance Method PGMigration = MigrationQuery Query
-- ^ Run a query against the database
| MigrationCode (Connection -> IO (Either String ()))
-- ^ Run any arbitrary IO code
Resulted in two instances of the "-- ^ Run a query against the database"
comment appearing in the Exact Print Annotations when it was parsed.
Ensure only one is kept.
Closes #20239
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With this change, `Backend` becomes an abstract type
(there are no more exposed value constructors).
Decisions that were formerly made by asking "is the
current back end equal to (or different from) this named value
constructor?" are now made by interrogating the back end about
its properties, which are functions exported by `GHC.Driver.Backend`.
There is a description of how to migrate code using `Backend` in the
user guide.
Clients using the GHC API can find a backdoor to access the Backend
datatype in GHC.Driver.Backend.Internal.
Bumps haddock submodule.
Fixes #20927
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(#20385)
Once we are done parsing the header of a module to obtain the options, we
look through the rest of the tokens in order to determine if they contain any
misplaced file header pragmas that would usually be ignored, potentially
resulting in bad error messages.
The warnings are reported immediately so that later errors don't shadow
over potentially helpful warnings.
Metric Increase:
T13719
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Names appearing in Haddock docstrings are lexed and renamed like any other names
appearing in the AST. We currently rename names irrespective of the namespace,
so both type and constructor names corresponding to an identifier will appear in
the docstring. Haddock will select a given name as the link destination based on
its own heuristics.
This patch also restricts the limitation of `-haddock` being incompatible with
`Opt_KeepRawTokenStream`.
The export and documenation structure is now computed in GHC and serialised in
.hi files. This can be used by haddock to directly generate doc pages without
reparsing or renaming the source. At the moment the operation of haddock
is not modified, that's left to a future patch.
Updates the haddock submodule with the minimum changes needed.
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AbsBinds and ABExport both depended on the typechecker, and were thus
removed from the main AST Expr.
CollectPass now has a new function `collectXXHsBindsLR` used for the new
HsBinds extension point
Bumped haddock submodule to work with AST changes.
The removed Notes from Language.Haskell.Syntax.Binds were duplicated
(and not referenced) and the copies in GHC.Hs.Binds are kept (and
referenced there). (See #19252)
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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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As noted in #20757, `GHC.SysTools.BaseDir.findToolDir` previously
contained an loop, which would be triggered in the case that the search
failed.
Closes #20757.
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Like the built-in type defaulting rules these plugins can propose candidates
to resolve ambiguous type variables.
Machine learning and other large APIs like those for game engines introduce
new numeric types and other complex typed APIs. The built-in defaulting
mechanism isn't powerful enough to resolve ambiguous types in these cases forcing
users to specify minutia that they might not even know how to do. There is
an example defaulting plugin linked in the documentation. Applications include
defaulting the device a computation executes on, if a gradient should be
computed for a tensor, or the size of a tensor.
See https://github.com/ghc-proposals/ghc-proposals/pull/396 for details.
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A comment followed by a semicolon at the top level resulted in the
preceding comments being attached to the following declaration.
Capture the comments as belonging to the declaration preceding the
semicolon instead.
Closes #20258
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We also add a new `ol_from_fun` field to renamed (but not yet
typechecked) OverLits. This has the nice knock-on effect of making
total some typechecker functions that used to be partial.
Fixes #20151
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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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This is an attempt at reducing the number of dependencies of the Parser
(as reported by CountParserDeps). Modules in GHC.Parser.* don't import
GHC.Driver.Session directly anymore.
Sadly some GHC.Driver.* modules are still transitively imported and the
number of dependencies didn't decrease. But it's a step in the right
direction.
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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 patch comprises of four different but closely related ideas. The
net result is fixing a large number of open issues with the driver
whilst making it simpler to understand.
1. Use the hash of the source file to determine whether the source file
has changed or not. This makes the recompilation checking more robust to
modern build systems which are liable to copy files around changing
their modification times.
2. Remove the concept of a "stable module", a stable module was one
where the object file was older than the source file, and all transitive
dependencies were also stable. Now we don't rely on the modification
time of the source file, the notion of stability is moot.
3. Fix TH/plugin recompilation after the removal of stable modules. The
TH recompilation check used to rely on stable modules. Now there is a
uniform and simple way, we directly track the linkables which were
loaded into the interpreter whilst compiling a module. This is an
over-approximation but more robust wrt package dependencies changing.
4. Fix recompilation checking for dynamic object files. Now we actually
check if the dynamic object file exists when compiling with -dynamic-too
Fixes #19774 #19771 #19758 #17434 #11556 #9121 #8211 #16495 #7277 #16093
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There was quite a large amount of indirection in these tests, so I have
rewritten them to just directly parse the files rather than making a
module graph and entering other twisty packages.
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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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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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These changes made it slightly easier for me to work out what was going
on in this test. I've also fixed a typo in the comments.
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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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All the comments are now captured in the AST, there is no need for a
side-channel structure for them.
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EPA == exact print annotations.
When !2418 landed, it did not run the tests brought over from
ghc-exactprint for making sure the AST prints correctly efter being
edited.
This enables those tests.
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In the `comments` and `literals` tests, since they contain file paths.
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Metric Increase:
T10370
parsing001
Updates haddock submodule
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