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* Track object file dependencies for TH accurately (#20604)Zubin Duggal2022-02-201-28/+35
| | | | | | | | | | | | | | | | | | | `hscCompileCoreExprHook` is changed to return a list of `Module`s required by a splice. These modules are accumulated in the TcGblEnv (tcg_th_needed_mods). Dependencies on the object files of these modules are recording in the interface. The data structures in `LoaderState` are replaced with more efficient versions to keep track of all the information required. The MultiLayerModulesTH_Make allocations increase slightly but runtime is faster. Fixes #20604 ------------------------- Metric Increase: MultiLayerModulesTH_Make -------------------------
* Multiple Home UnitsMatthew Pickering2021-12-281-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Give plugins a better interface (#17957)Sylvain Henry2021-12-211-5/+7
| | | | | | | | | | | | Plugins were directly fetched from HscEnv (hsc_static_plugins and hsc_plugins). The tight coupling of plugins and of HscEnv is undesirable and it's better to store them in a new Plugins datatype and to use it in the plugins' API (e.g. withPlugins, mapPlugins...). In the process, the interactive context (used by GHCi) got proper support for different static plugins than those used for loaded modules. Bump haddock submodule
* Plugin load order should follow the commandline order (fixes #17884)Andrei Barbu2021-12-151-2/+2
| | | | | | | In the past the order was reversed because flags are consed onto a list. No particular behavior was documented. We now reverse the flags and document the behavior.
* Reflect type change in the haddock commentKai Prott2021-11-261-1/+1
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* Fix plugin type to GHC.Plugins.PluginKai Prott2021-11-261-1/+1
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* Simplify printQualificationKai Prott2021-11-261-7/+2
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* Remove duplicate importKai Prott2021-11-261-1/+0
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* Improve error message for mis-typed plugins #20671Kai Prott2021-11-261-14/+24
| | | | Previously, when a plugin could not be loaded because it was incorrectly typed, the error message only printed the expected but not the actual type. This commit augments the error message such that both types are printed and the corresponding module is printed as well.
* More support for optional home-unitSylvain Henry2021-11-201-6/+8
| | | | | | | | | 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.
* Introduce FinderLocations for decoupling Finder from DynFlagsFendor2021-07-231-1/+3
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* Make Logger independent of DynFlagsSylvain Henry2021-06-071-6/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
* Driver Rework PatchMatthew Pickering2021-06-031-18/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Remove useless {-# LANGUAGE CPP #-} pragmasSylvain Henry2021-05-121-1/+1
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* Make GHC.Runtime.Interpreter independent of GHC.DriverSylvain Henry2021-04-301-1/+1
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* Replace (ptext .. sLit) with `text`Sylvain Henry2021-04-291-4/+2
| | | | | | | | | | | | | | | 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.
* Refactor FinderCacheSylvain Henry2021-03-261-2/+5
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* Move loader state into InterpSylvain Henry2021-03-231-12/+14
| | | | | | | | | | | | | | | | | | 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.).
* Move Hooks into HscEnvSylvain Henry2021-02-221-1/+4
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* Refactor LoggerSylvain Henry2021-02-131-6/+8
| | | | | | | | | | | | | | | | | | | | | Before this patch, the only way to override GHC's default logging behavior was to set `log_action`, `dump_action` and `trace_action` fields in DynFlags. This patch introduces a new Logger abstraction and stores it in HscEnv instead. This is part of #17957 (avoid storing state in DynFlags). DynFlags are duplicated and updated per-module (because of OPTIONS_GHC pragma), so we shouldn't store global state in them. This patch also fixes a race in parallel "--make" mode which updated the `generatedDumps` IORef concurrently. Bump haddock submodule The increase in MultilayerModules is tracked in #19293. Metric Increase: MultiLayerModules
* Refactor renamer datastructuresAdam Gundry2020-12-241-2/+2
| | | | | | | | | | | | | | | This patch significantly refactors key renamer datastructures (primarily Avail and GlobalRdrElt) in order to treat DuplicateRecordFields in a more robust way. In particular it allows the extension to be used with pattern synonyms (fixes where mangled record selector names could be printed instead of field labels (e.g. with -Wpartial-fields or hole fits, see new tests). The key idea is the introduction of a new type GreName for names that may represent either normal entities or field labels. This is then used in GlobalRdrElt and AvailInfo, in place of the old way of representing fields using FldParent (yuck) and an extra list in AvailTC. Updates the haddock submodule.
* Move Unit related fields from DynFlags to HscEnvSylvain Henry2020-12-141-3/+3
| | | | | | | | | | | | | The unit database cache, the home unit and the unit state were stored in DynFlags while they ought to be stored in the compiler session state (HscEnv). This patch fixes this. It introduces a new UnitEnv type that should be used in the future to handle separate unit environments (especially host vs target units). Related to #17957 Bump haddock submodule
* Move Plugins into HscEnv (#17957)Sylvain Henry2020-11-211-14/+15
| | | | | | | | | | Loaded plugins have nothing to do in DynFlags so this patch moves them into HscEnv (session state). "DynFlags plugins" become "Driver plugins" to still be able to register static plugins. Bump haddock submodule
* Linker: reorganize linker related codeSylvain Henry2020-11-031-3/+3
| | | | | | | Move linker related code into GHC.Linker. Previously it was scattered into GHC.Unit.State, GHC.Driver.Pipeline, GHC.Runtime.Linker, etc. Add documentation in GHC.Linker
* Add the proper HLint rules and remove redundant keywords from compilerHécate2020-11-011-2/+1
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* Split GHC.Driver.TypesSylvain Henry2020-10-291-11/+18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Lint the compiler for extraneous LANGUAGE pragmasHécate2020-10-101-1/+1
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* Cache HomeUnit in HscEnv (#17957)Sylvain Henry2020-10-091-2/+2
| | | | | Instead of recreating the HomeUnit from the DynFlags every time we need it, we store it in the HscEnv.
* DynFlags: disentangle OutputableSylvain Henry2020-08-121-0/+1
| | | | | | | | | - 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
* Rename Package into Unit (2)Sylvain Henry2020-06-131-1/+1
| | | | | | | * rename PackageState into UnitState * rename findWiredInPackages into findWiredInUnits * rename lookupModuleInAll[Packages,Units] * etc.
* Unit: split and rename modulesSylvain Henry2020-04-301-1/+1
| | | | | | | Introduce GHC.Unit.* hierarchy for everything concerning units, packages and modules. Update Haddock submodule
* Modules: Utils and Data (#13009)Sylvain Henry2020-04-261-6/+6
| | | | | | | Update Haddock submodule Metric Increase: haddock.compiler
* Modules (#13009)Sylvain Henry2020-04-181-1/+1
| | | | | | | | | | | | | | * SysTools * Parser * GHC.Builtin * GHC.Iface.Recomp * Settings Update Haddock submodule Metric Decrease: Naperian parsing001
* Modules: type-checker (#13009)Sylvain Henry2020-04-071-2/+2
| | | | Update Haddock submodule
* Modules: Types (#13009)Sylvain Henry2020-03-291-12/+12
| | | | | | | Update Haddock submodule Metric Increase: haddock.compiler
* Modules: Core (#13009)Sylvain Henry2020-03-161-3/+3
| | | | Update submodule: haddock
* Refactor interpreterDynamic and interpreterProfiledSylvain Henry2020-03-111-1/+1
| | | | | | | | * `interpreterDynamic` and `interpreterProfiled` now take `Interp` parameters instead of DynFlags * slight refactoring of `ExternalInterp` so that we can read the iserv configuration (which is pure) without reading an MVar.
* Refactor runtime interpreter codeSylvain Henry2020-02-291-10/+10
| | | | | | | | | | | | | | | In #14335 we want to be able to use both the internal interpreter (for the plugins) and the external interpreter (for TH and GHCi) at the same time. This patch performs some preliminary refactoring: the `hsc_interp` field of HscEnv replaces `hsc_iserv` and is now used to indicate which interpreter (internal, external) to use to execute TH and GHCi. Opt_ExternalInterpreter flag and iserv options in DynFlags are now queried only when we set the session DynFlags. It should help making GHC multi-target in the future by selecting an interpreter according to the selected target.
* Modules: Driver (#13009)Sylvain Henry2020-02-211-5/+5
| | | | submodule updates: nofib, haddock
* Re-implement unsafe coercions in terms of unsafe equality proofsSimon Peyton Jones2020-02-201-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (Commit message written by Omer, most of the code is written by Simon and Richard) See Note [Implementing unsafeCoerce] for how unsafe equality proofs and the new unsafeCoerce# are implemented. New notes added: - [Checking for levity polymorphism] in CoreLint.hs - [Implementing unsafeCoerce] in base/Unsafe/Coerce.hs - [Patching magic definitions] in Desugar.hs - [Wiring in unsafeCoerce#] in Desugar.hs Only breaking change in this patch is unsafeCoerce# is not exported from GHC.Exts, instead of GHC.Prim. 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Allocates more on 32-bit platforms. - Rest of the increases are tiny amounts (still enough to pass the threshold) in micro-benchmarks. I briefly looked at each one in a profiling build: most of the increased allocations seem to be because of random changes in the generated code. Metric Decrease: T14683 Metric Increase: T12150 T12234 T12425 T13035 T14683 T5837 T6048 Co-Authored-By: Richard Eisenberg <rae@cs.brynmawr.edu> Co-Authored-By: Ömer Sinan Ağacan <omeragacan@gmail.com>
* Module hierarchy: ByteCode and Runtime (cf #13009)Sylvain Henry2020-02-121-0/+283
Update haddock submodule