GHC.Driver.Main

ghc-9.4.0.20220501: The GHC API

Safe Haskell | Safe-Inferred
Language | Haskell2010

GHC.Driver.Main

Contents

- Making an HscEnv
- Compiling complete source files
- Running passes separately
- Safe Haskell
- Support for interactive evaluation
- Low-level exports for hooks

Description

Main API for compiling plain Haskell source code.

This module implements compilation of a Haskell source. It is not concerned with preprocessing of source files; this is handled in GHC.Driver.Pipeline

There are various entry points depending on what mode we're in: "batch" mode (`--make`), "one-shot" mode (`-c`, `-S` etc.), and "interactive" mode (GHCi). There are also entry points for individual passes: parsing, typechecking/renaming, desugaring, and simplification.

All the functions here take an `HscEnv` as a parameter, but none of them return a new one: `HscEnv` is treated as an immutable value from here on in (although it has mutable components, for the caches).

We use the Hsc monad to deal with warning messages consistently: specifically, while executing within an Hsc monad, warnings are collected. When a Hsc monad returns to an IO monad, the warnings are printed, or compilation aborts if the `-Werror` flag is enabled.

(c) The GRASP/AQUA Project, Glasgow University, 1993-2000

Synopsis

- newHscEnv :: DynFlags -> IO HscEnv
- newHscEnvWithHUG :: DynFlags -> UnitId -> HomeUnitGraph -> IO HscEnv
- type Messager = HscEnv -> (Int, Int) -> RecompileRequired -> ModuleGraphNode -> IO ()
- batchMsg :: Messager
- batchMultiMsg :: Messager
- data HscBackendAction
  - = HscUpdate ModIface
  - | HscRecomp {
    - hscs_guts :: CgGuts
    - hscs_mod_location :: !ModLocation
    - hscs_partial_iface :: !PartialModIface
    - hscs_old_iface_hash :: !(Maybe Fingerprint)
    }
- data HscRecompStatus
  - = HscUpToDate ModIface (Maybe Linkable)
  - | HscRecompNeeded (Maybe Fingerprint)
- initModDetails :: HscEnv -> ModSummary -> ModIface -> IO ModDetails
- hscMaybeWriteIface :: Logger -> DynFlags -> Bool -> ModIface -> Maybe Fingerprint -> ModLocation -> IO ()
- hscCompileCmmFile :: HscEnv -> FilePath -> FilePath -> IO (Maybe FilePath)
- hscGenHardCode :: HscEnv -> CgGuts -> ModLocation -> FilePath -> IO (FilePath, Maybe FilePath, [(ForeignSrcLang, FilePath)], Maybe CgInfos)
- hscInteractive :: HscEnv -> CgGuts -> ModLocation -> IO (Maybe FilePath, CompiledByteCode, [SptEntry])
- hscRecompStatus :: Maybe Messager -> HscEnv -> ModSummary -> Maybe ModIface -> Maybe Linkable -> (Int, Int) -> IO HscRecompStatus
- hscParse :: HscEnv -> ModSummary -> IO HsParsedModule
- hscTypecheckRename :: HscEnv -> ModSummary -> HsParsedModule -> IO (TcGblEnv, RenamedStuff)
- hscTypecheckAndGetWarnings :: HscEnv -> ModSummary -> IO (FrontendResult, WarningMessages)
- hscDesugar :: HscEnv -> ModSummary -> TcGblEnv -> IO ModGuts
- makeSimpleDetails :: Logger -> TcGblEnv -> IO ModDetails
- hscSimplify :: HscEnv -> [String] -> ModGuts -> IO ModGuts
- hscDesugarAndSimplify :: ModSummary -> FrontendResult -> Messages GhcMessage -> Maybe Fingerprint -> Hsc HscBackendAction
- hscCheckSafe :: HscEnv -> Module -> SrcSpan -> IO Bool
- hscGetSafe :: HscEnv -> Module -> SrcSpan -> IO (Bool, Set UnitId)
- hscParseIdentifier :: HscEnv -> String -> IO (LocatedN RdrName)
- hscTcRcLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
- hscTcRnGetInfo :: HscEnv -> Name -> IO (Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc))
- hscIsGHCiMonad :: HscEnv -> String -> IO Name
- hscGetModuleInterface :: HscEnv -> Module -> IO ModIface
- hscRnImportDecls :: HscEnv -> [LImportDecl GhcPs] -> IO GlobalRdrEnv
- hscTcRnLookupRdrName :: HscEnv -> LocatedN RdrName -> IO [Name]
- hscStmt :: HscEnv -> String -> IO (Maybe ([Id], ForeignHValue, FixityEnv))
- hscParseStmtWithLocation :: String -> Int -> String -> Hsc (Maybe (GhciLStmt GhcPs))
- hscStmtWithLocation :: HscEnv -> String -> String -> Int -> IO (Maybe ([Id], ForeignHValue, FixityEnv))
- hscParsedStmt :: HscEnv -> GhciLStmt GhcPs -> IO (Maybe ([Id], ForeignHValue, FixityEnv))
- hscDecls :: HscEnv -> String -> IO ([TyThing], InteractiveContext)
- hscParseDeclsWithLocation :: HscEnv -> String -> Int -> String -> IO [LHsDecl GhcPs]
- hscDeclsWithLocation :: HscEnv -> String -> String -> Int -> IO ([TyThing], InteractiveContext)
- hscParsedDecls :: HscEnv -> [LHsDecl GhcPs] -> IO ([TyThing], InteractiveContext)
- hscParseModuleWithLocation :: HscEnv -> String -> Int -> String -> IO HsModule
- hscTcExpr :: HscEnv -> TcRnExprMode -> String -> IO Type
- data TcRnExprMode
  - = TM_Inst
  - | TM_Default
- hscImport :: HscEnv -> String -> IO (ImportDecl GhcPs)
- hscKcType :: HscEnv -> Bool -> String -> IO (Type, Kind)
- hscParseExpr :: String -> Hsc (LHsExpr GhcPs)
- hscParseType :: String -> Hsc (LHsType GhcPs)
- hscCompileCoreExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO (ForeignHValue, [Linkable], PkgsLoaded)
- hscTidy :: HscEnv -> ModGuts -> IO (CgGuts, ModDetails)
- hscCompileCoreExpr' :: HscEnv -> SrcSpan -> CoreExpr -> IO (ForeignHValue, [Linkable], PkgsLoaded)
- hscParse' :: ModSummary -> Hsc HsParsedModule
- hscSimplify' :: [String] -> ModGuts -> Hsc ModGuts
- hscDesugar' :: ModLocation -> TcGblEnv -> Hsc ModGuts
- tcRnModule' :: ModSummary -> Bool -> HsParsedModule -> Hsc TcGblEnv
- doCodeGen :: HscEnv -> Module -> InfoTableProvMap -> [TyCon] -> CollectedCCs -> [CgStgTopBinding] -> HpcInfo -> IO (Stream IO CmmGroupSRTs CgInfos)
- getHscEnv :: Hsc HscEnv
- hscSimpleIface' :: TcGblEnv -> ModSummary -> Hsc (ModIface, ModDetails)
- oneShotMsg :: Logger -> RecompileRequired -> IO ()
- dumpIfaceStats :: HscEnv -> IO ()
- ioMsgMaybe :: IO (Messages GhcMessage, Maybe a) -> Hsc a
- showModuleIndex :: (Int, Int) -> SDoc
- hscAddSptEntries :: HscEnv -> [SptEntry] -> IO ()
- writeInterfaceOnlyMode :: DynFlags -> Bool

# Making an HscEnv

newHscEnv :: DynFlags -> IO HscEnv Source #

newHscEnvWithHUG :: DynFlags -> UnitId -> HomeUnitGraph -> IO HscEnv Source #

# Compiling complete source files

type Messager = HscEnv -> (Int, Int) -> RecompileRequired -> ModuleGraphNode -> IO () Source #

batchMsg :: Messager Source #

batchMultiMsg :: Messager Source #

data HscBackendAction Source #

Action to perform in backend compilation

Constructors

HscUpdate ModIface | Update the boot and signature file results.
HscRecomp | Recompile this module.
Fields hscs_guts :: CgGuts Information for the code generator. hscs_mod_location :: !ModLocation Module info hscs_partial_iface :: !PartialModIface Partial interface hscs_old_iface_hash :: !(Maybe Fingerprint) Old interface hash for this compilation, if an old interface file exists. Pass to `hscMaybeWriteIface` when writing the interface to avoid updating the existing interface when the interface isn't changed.

#### Instances

Instances details

Outputable HscBackendAction Source # |
Instance details Defined in GHC.Unit.Module.Status Methods ppr :: HscBackendAction -> SDoc Source #

data HscRecompStatus Source #

Status of a module in incremental compilation

Constructors

HscUpToDate ModIface (Maybe Linkable) | Nothing to do because code already exists.
HscRecompNeeded (Maybe Fingerprint) | Recompilation of module, or update of interface is required. Optionally pass the old interface hash to avoid updating the existing interface when it has not changed.

initModDetails :: HscEnv -> ModSummary -> ModIface -> IO ModDetails Source #

hscMaybeWriteIface Source #

Arguments

:: Logger |
-> DynFlags |
-> Bool | Is this a simple interface generated after the core pipeline, or one with information from the backend? See: Note [Writing interface files]
-> ModIface |
-> Maybe Fingerprint | The old interface hash, used to decide if we need to actually write the new interface.
-> ModLocation |
-> IO () |

Write interface files

hscCompileCmmFile :: HscEnv -> FilePath -> FilePath -> IO (Maybe FilePath) Source #

hscGenHardCode Source #

Arguments

:: HscEnv |
-> CgGuts |
-> ModLocation |
-> FilePath |
-> IO (FilePath, Maybe FilePath, [(ForeignSrcLang, FilePath)], Maybe CgInfos) | `Just f` = _stub.c is f

Compile to hard-code.

hscInteractive :: HscEnv -> CgGuts -> ModLocation -> IO (Maybe FilePath, CompiledByteCode, [SptEntry]) Source #

# Running passes separately

hscRecompStatus :: Maybe Messager -> HscEnv -> ModSummary -> Maybe ModIface -> Maybe Linkable -> (Int, Int) -> IO HscRecompStatus Source #

Do the recompilation avoidance checks for both one-shot and --make modes This function is the *only* place in the compiler where we decide whether to recompile a module or not!

hscParse :: HscEnv -> ModSummary -> IO HsParsedModule Source #

parse a file, returning the abstract syntax

hscTypecheckRename :: HscEnv -> ModSummary -> HsParsedModule -> IO (TcGblEnv, RenamedStuff) Source #

Rename and typecheck a module, additionally returning the renamed syntax

hscTypecheckAndGetWarnings :: HscEnv -> ModSummary -> IO (FrontendResult, WarningMessages) Source #

Do Typechecking without throwing SourceError exception with -Werror

hscDesugar :: HscEnv -> ModSummary -> TcGblEnv -> IO ModGuts Source #

Convert a typechecked module to Core

makeSimpleDetails :: Logger -> TcGblEnv -> IO ModDetails Source #

Make a `ModDetails` from the results of typechecking. Used when typechecking only, as opposed to full compilation.

hscSimplify :: HscEnv -> [String] -> ModGuts -> IO ModGuts Source #

Run Core2Core simplifier. The list of String is a list of (Core) plugin module names added via TH (cf `addCorePlugin`).

hscDesugarAndSimplify :: ModSummary -> FrontendResult -> Messages GhcMessage -> Maybe Fingerprint -> Hsc HscBackendAction Source #

# Safe Haskell

hscCheckSafe :: HscEnv -> Module -> SrcSpan -> IO Bool Source #

Check that a module is safe to import.

We return True to indicate the import is safe and False otherwise although in the False case an exception may be thrown first.

hscGetSafe :: HscEnv -> Module -> SrcSpan -> IO (Bool, Set UnitId) Source #

Return if a module is trusted and the pkgs it depends on to be trusted.

# Support for interactive evaluation

hscParseIdentifier :: HscEnv -> String -> IO (LocatedN RdrName) Source #

hscTcRcLookupName :: HscEnv -> Name -> IO (Maybe TyThing) Source #

hscTcRnGetInfo :: HscEnv -> Name -> IO (Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc)) Source #

hscIsGHCiMonad :: HscEnv -> String -> IO Name Source #

hscGetModuleInterface :: HscEnv -> Module -> IO ModIface Source #

hscRnImportDecls :: HscEnv -> [LImportDecl GhcPs] -> IO GlobalRdrEnv Source #

Rename some import declarations

hscTcRnLookupRdrName :: HscEnv -> LocatedN RdrName -> IO [Name] Source #

Lookup things in the compiler's environment

hscStmt :: HscEnv -> String -> IO (Maybe ([Id], ForeignHValue, FixityEnv)) Source #

Compile a stmt all the way to an HValue, but don't run it

We return Nothing to indicate an empty statement (or comment only), not a parse error.

hscParseStmtWithLocation :: String -> Int -> String -> Hsc (Maybe (GhciLStmt GhcPs)) Source #

hscStmtWithLocation Source #

Arguments

:: HscEnv |
-> String | The statement
-> String | The source
-> Int | Starting line
-> IO (Maybe ([Id], ForeignHValue, FixityEnv)) |

Compile a stmt all the way to an HValue, but don't run it

We return Nothing to indicate an empty statement (or comment only), not a parse error.

hscParsedStmt Source #

Arguments

:: HscEnv |
-> GhciLStmt GhcPs | The parsed statement
-> IO (Maybe ([Id], ForeignHValue, FixityEnv)) |

hscDecls Source #

Arguments

:: HscEnv |
-> String | The statement
-> IO ([TyThing], InteractiveContext) |

Compile a decls

hscParseDeclsWithLocation :: HscEnv -> String -> Int -> String -> IO [LHsDecl GhcPs] Source #

hscDeclsWithLocation Source #

Arguments

:: HscEnv |
-> String | The statement
-> String | The source
-> Int | Starting line
-> IO ([TyThing], InteractiveContext) |

Compile a decls

hscParsedDecls :: HscEnv -> [LHsDecl GhcPs] -> IO ([TyThing], InteractiveContext) Source #

hscParseModuleWithLocation :: HscEnv -> String -> Int -> String -> IO HsModule Source #

hscTcExpr Source #

Arguments

:: HscEnv |
-> TcRnExprMode |
-> String | The expression
-> IO Type |

Typecheck an expression (but don't run it)

data TcRnExprMode Source #

How should we infer a type? See Note [TcRnExprMode]

Constructors

TM_Inst | Instantiate inferred quantifiers only (:type)
TM_Default | Instantiate all quantifiers, and do eager defaulting (:type +d)

hscImport :: HscEnv -> String -> IO (ImportDecl GhcPs) Source #

hscKcType Source #

Arguments

:: HscEnv |
-> Bool | Normalise the type
-> String | The type as a string
-> IO (Type, Kind) | Resulting type (possibly normalised) and kind

Find the kind of a type, after generalisation

hscParseExpr :: String -> Hsc (LHsExpr GhcPs) Source #

hscParseType :: String -> Hsc (LHsType GhcPs) Source #

hscCompileCoreExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO (ForeignHValue, [Linkable], PkgsLoaded) Source #

hscTidy :: HscEnv -> ModGuts -> IO (CgGuts, ModDetails) Source #

# Low-level exports for hooks

hscCompileCoreExpr' :: HscEnv -> SrcSpan -> CoreExpr -> IO (ForeignHValue, [Linkable], PkgsLoaded) Source #

hscParse' :: ModSummary -> Hsc HsParsedModule Source #

hscSimplify' :: [String] -> ModGuts -> Hsc ModGuts Source #

Run Core2Core simplifier. The list of String is a list of (Core) plugin module names added via TH (cf `addCorePlugin`).

hscDesugar' :: ModLocation -> TcGblEnv -> Hsc ModGuts Source #

tcRnModule' :: ModSummary -> Bool -> HsParsedModule -> Hsc TcGblEnv Source #

doCodeGen Source #

Arguments

:: HscEnv |
-> Module |
-> InfoTableProvMap |
-> [TyCon] |
-> CollectedCCs |
-> [CgStgTopBinding] | Bindings come already annotated with fvs
-> HpcInfo |
-> IO (Stream IO CmmGroupSRTs CgInfos) |

getHscEnv :: Hsc HscEnv Source #

hscSimpleIface' :: TcGblEnv -> ModSummary -> Hsc (ModIface, ModDetails) Source #

oneShotMsg :: Logger -> RecompileRequired -> IO () Source #

dumpIfaceStats :: HscEnv -> IO () Source #

ioMsgMaybe :: IO (Messages GhcMessage, Maybe a) -> Hsc a Source #

Deal with errors and warnings returned by a compilation step

In order to reduce dependencies to other parts of the compiler, functions outside the "main" parts of GHC return warnings and errors as a parameter and signal success via by wrapping the result in a `Maybe` type. This function logs the returned warnings and propagates errors as exceptions (of type `SourceError`).

This function assumes the following invariants:

1. If the second result indicates success (is of the form 'Just x'), there must be no error messages in the first result.
2. If there are no error messages, but the second result indicates failure there should be warnings in the first result. That is, if the action failed, it must have been due to the warnings (i.e., `-Werror`).

showModuleIndex :: (Int, Int) -> SDoc Source #

hscAddSptEntries :: HscEnv -> [SptEntry] -> IO () Source #

Load the given static-pointer table entries into the interpreter. See Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable.

writeInterfaceOnlyMode :: DynFlags -> Bool Source #