ghc-9.6.3: The GHC API

Safe Haskell | Safe-Inferred
Language | Haskell2010

GHC.Core.Make

Contents

- Constructing normal syntax
- Constructing boxed literals
- Floats
- Constructing small tuples
- Constructing big tuples
- Deconstructing big tuples
- Constructing list expressions
- Constructing Maybe expressions
- Error Ids

Description

Handy functions for creating much Core syntax

Synopsis

- mkCoreLet :: CoreBind -> CoreExpr -> CoreExpr
- mkCoreLets :: [CoreBind] -> CoreExpr -> CoreExpr
- mkCoreApp :: SDoc -> CoreExpr -> CoreExpr -> CoreExpr
- mkCoreApps :: CoreExpr -> [CoreExpr] -> CoreExpr
- mkCoreConApps :: DataCon -> [CoreExpr] -> CoreExpr
- mkCoreLams :: [CoreBndr] -> CoreExpr -> CoreExpr
- mkWildCase :: CoreExpr -> Scaled Type -> Type -> [CoreAlt] -> CoreExpr
- mkIfThenElse :: CoreExpr -> CoreExpr -> CoreExpr -> CoreExpr
- mkWildValBinder :: Mult -> Type -> Id
- mkWildEvBinder :: PredType -> EvVar
- mkSingleAltCase :: CoreExpr -> Id -> AltCon -> [Var] -> CoreExpr -> CoreExpr
- sortQuantVars :: [Var] -> [Var]
- castBottomExpr :: CoreExpr -> Type -> CoreExpr
- mkLitRubbish :: Type -> Maybe CoreExpr
- mkWordExpr :: Platform -> Integer -> CoreExpr
- mkIntExpr :: Platform -> Integer -> CoreExpr
- mkIntExprInt :: Platform -> Int -> CoreExpr
- mkUncheckedIntExpr :: Integer -> CoreExpr
- mkIntegerExpr :: Platform -> Integer -> CoreExpr
- mkNaturalExpr :: Platform -> Integer -> CoreExpr
- mkFloatExpr :: Float -> CoreExpr
- mkDoubleExpr :: Double -> CoreExpr
- mkCharExpr :: Char -> CoreExpr
- mkStringExpr :: MonadThings m => String -> m CoreExpr
- mkStringExprFS :: MonadThings m => FastString -> m CoreExpr
- mkStringExprFSWith :: MkStringIds -> FastString -> CoreExpr
- data MkStringIds = MkStringIds {
  - unpackCStringId :: !Id
  - unpackCStringUtf8Id :: !Id
  }
- getMkStringIds :: Applicative m => (Name -> m Id) -> m MkStringIds
- data FloatBind
  - = FloatLet CoreBind
  - | FloatCase CoreExpr Id AltCon [Var]
- wrapFloat :: FloatBind -> CoreExpr -> CoreExpr
- wrapFloats :: [FloatBind] -> CoreExpr -> CoreExpr
- floatBindings :: FloatBind -> [Var]
- mkCoreVarTupTy :: [Id] -> Type
- mkCoreTup :: [CoreExpr] -> CoreExpr
- mkCoreUnboxedTuple :: [CoreExpr] -> CoreExpr
- mkCoreUnboxedSum :: Int -> Int -> [Type] -> CoreExpr -> CoreExpr
- mkCoreTupBoxity :: Boxity -> [CoreExpr] -> CoreExpr
- unitExpr :: CoreExpr
- mkChunkified :: ([a] -> a) -> [a] -> a
- chunkify :: [a] -> [[a]]
- mkBigCoreVarTup :: [Id] -> CoreExpr
- mkBigCoreVarTupSolo :: [Id] -> CoreExpr
- mkBigCoreVarTupTy :: [Id] -> Type
- mkBigCoreTupTy :: [Type] -> Type
- mkBigCoreTup :: [CoreExpr] -> CoreExpr
- mkBigTupleSelector :: [Id] -> Id -> Id -> CoreExpr -> CoreExpr
- mkBigTupleSelectorSolo :: [Id] -> Id -> Id -> CoreExpr -> CoreExpr
- mkBigTupleCase :: UniqSupply -> [Id] -> CoreExpr -> CoreExpr -> CoreExpr
- mkNilExpr :: Type -> CoreExpr
- mkConsExpr :: Type -> CoreExpr -> CoreExpr -> CoreExpr
- mkListExpr :: Type -> [CoreExpr] -> CoreExpr
- mkFoldrExpr :: MonadThings m => Type -> Type -> CoreExpr -> CoreExpr -> CoreExpr -> m CoreExpr
- mkBuildExpr :: (MonadFail m, MonadThings m, MonadUnique m) => Type -> ((Id, Type) -> (Id, Type) -> m CoreExpr) -> m CoreExpr
- mkNothingExpr :: Type -> CoreExpr
- mkJustExpr :: Type -> CoreExpr -> CoreExpr
- mkRuntimeErrorApp :: Id -> Type -> String -> CoreExpr
- mkImpossibleExpr :: Type -> String -> CoreExpr
- mkAbsentErrorApp :: Type -> String -> CoreExpr
- errorIds :: [Id]
- rEC_CON_ERROR_ID :: Id
- nON_EXHAUSTIVE_GUARDS_ERROR_ID :: Id
- nO_METHOD_BINDING_ERROR_ID :: Id
- pAT_ERROR_ID :: Id
- rEC_SEL_ERROR_ID :: Id
- tYPE_ERROR_ID :: Id
- aBSENT_SUM_FIELD_ERROR_ID :: Id

# Constructing normal syntax

mkCoreLet :: CoreBind -> CoreExpr -> CoreExpr Source #

Bind a binding group over an expression, using a `let` or `case` as appropriate (see GHC.Core)

mkCoreLets :: [CoreBind] -> CoreExpr -> CoreExpr Source #

Bind a list of binding groups over an expression. The leftmost binding group becomes the outermost group in the resulting expression

mkCoreApp infixl 4 Source #

Arguments

:: SDoc |
-> CoreExpr | function
-> CoreExpr | argument
-> CoreExpr |

Construct an expression which represents the application of one expression to the other

mkCoreApps infixl 4 Source #

Arguments

:: CoreExpr | function
-> [CoreExpr] | arguments
-> CoreExpr |

Construct an expression which represents the application of a number of expressions to another. The leftmost expression in the list is applied first

mkCoreConApps :: DataCon -> [CoreExpr] -> CoreExpr Source #

Construct an expression which represents the application of a number of expressions to that of a data constructor expression. The leftmost expression in the list is applied first

mkCoreLams :: [CoreBndr] -> CoreExpr -> CoreExpr Source #

Create a lambda where the given expression has a number of variables bound over it. The leftmost binder is that bound by the outermost lambda in the result

mkWildCase Source #

Arguments

:: CoreExpr | scrutinee
-> Scaled Type |
-> Type | res_ty
-> [CoreAlt] | alts
-> CoreExpr |

Make a case expression whose case binder is unused The alts and res_ty should not have any occurrences of WildId

mkIfThenElse Source #

Arguments

:: CoreExpr | guard
-> CoreExpr | then
-> CoreExpr | else
-> CoreExpr |

mkWildValBinder :: Mult -> Type -> Id Source #

Make a wildcard binder. This is typically used when you need a binder that you expect to use only at a *binding* site. Do not use it at occurrence sites because it has a single, fixed unique, and it's very easy to get into difficulties with shadowing. That's why it is used so little.

See Note [WildCard binders] in GHC.Core.Opt.Simplify.Env

mkWildEvBinder :: PredType -> EvVar Source #

mkSingleAltCase :: CoreExpr -> Id -> AltCon -> [Var] -> CoreExpr -> CoreExpr Source #

sortQuantVars :: [Var] -> [Var] Source #

Sort the variables, putting type and covars first, in scoped order, and then other Ids

It is a deterministic sort, meaning it doesn't look at the values of Uniques. For explanation why it's important See Note [Unique Determinism] in GHC.Types.Unique.

castBottomExpr :: CoreExpr -> Type -> CoreExpr Source #

# Constructing boxed literals

mkLitRubbish :: Type -> Maybe CoreExpr Source #

mkWordExpr :: Platform -> Integer -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to a `Word` with the given value

mkIntExpr :: Platform -> Integer -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Int`

mkIntExprInt :: Platform -> Int -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Int`

mkUncheckedIntExpr :: Integer -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Int`. Don't check that the number is in the range of the target platform `Int`

mkIntegerExpr :: Platform -> Integer -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Integer`

mkNaturalExpr :: Platform -> Integer -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Natural`

mkFloatExpr :: Float -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Float`

mkDoubleExpr :: Double -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Double`

mkCharExpr :: Char -> CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `Char`

mkStringExpr :: MonadThings m => String -> m CoreExpr Source #

Create a `CoreExpr` which will evaluate to the given `String`

mkStringExprFS :: MonadThings m => FastString -> m CoreExpr Source #

Create a `CoreExpr` which will evaluate to a string morally equivalent to the given `FastString`

mkStringExprFSWith :: MkStringIds -> FastString -> CoreExpr Source #

data MkStringIds Source #

Constructors

MkStringIds |

Fields

- unpackCStringId :: !Id
- unpackCStringUtf8Id :: !Id

getMkStringIds :: Applicative m => (Name -> m Id) -> m MkStringIds Source #

# Floats

data FloatBind Source #

Constructors

FloatLet CoreBind |
FloatCase CoreExpr Id AltCon [Var] |

#### Instances

Instances details

Outputable FloatBind Source # |
Instance details Defined in GHC.Core.Make Methods ppr :: FloatBind -> SDoc Source #

wrapFloat :: FloatBind -> CoreExpr -> CoreExpr Source #

wrapFloats :: [FloatBind] -> CoreExpr -> CoreExpr Source #

Applies the floats from right to left. That is `wrapFloats [b1, b2, …, bn] u = let b1 in let b2 in … in let bn in u`

floatBindings :: FloatBind -> [Var] Source #

# Constructing small tuples

mkCoreVarTupTy :: [Id] -> Type Source #

Build the type of a small tuple that holds the specified variables One-tuples are flattened; see Note [Flattening one-tuples]

mkCoreTup :: [CoreExpr] -> CoreExpr Source #

Build a small tuple holding the specified expressions One-tuples are flattened; see Note [Flattening one-tuples]

mkCoreUnboxedTuple :: [CoreExpr] -> CoreExpr Source #

Build a small unboxed tuple holding the specified expressions. Do not include the RuntimeRep specifiers; this function calculates them for you. Does not flatten one-tuples; see Note [Flattening one-tuples]

mkCoreUnboxedSum :: Int -> Int -> [Type] -> CoreExpr -> CoreExpr Source #

Build an unboxed sum.

Alternative number ("alt") starts from 1.

mkCoreTupBoxity :: Boxity -> [CoreExpr] -> CoreExpr Source #

Make a core tuple of the given boxity; don't flatten 1-tuples

unitExpr :: CoreExpr Source #

The unit expression

# Constructing big tuples

mkChunkified Source #

Arguments

:: ([a] -> a) | "Small" constructor function, of maximum input arity `mAX_TUPLE_SIZE`
-> [a] | Possible "big" list of things to construct from
-> a | Constructed thing made possible by recursive decomposition

Lifts a "small" constructor into a "big" constructor by recursive decomposition

chunkify :: [a] -> [[a]] Source #

Split a list into lists that are small enough to have a corresponding tuple arity. The sub-lists of the result all have length <= `mAX_TUPLE_SIZE` But there may be more than `mAX_TUPLE_SIZE` sub-lists

mkBigCoreVarTup :: [Id] -> CoreExpr Source #

Build a big tuple holding the specified variables One-tuples are flattened; see Note [Flattening one-tuples] Arguments don't have to have kind Type

mkBigCoreVarTupSolo :: [Id] -> CoreExpr Source #

mkBigCoreVarTupTy :: [Id] -> Type Source #

Build the type of a big tuple that holds the specified variables One-tuples are flattened; see Note [Flattening one-tuples]

mkBigCoreTupTy :: [Type] -> Type Source #

Build the type of a big tuple that holds the specified type of thing One-tuples are flattened; see Note [Flattening one-tuples]

mkBigCoreTup :: [CoreExpr] -> CoreExpr Source #

Build a "big" tuple holding the specified expressions One-tuples are flattened; see Note [Flattening one-tuples] Arguments don't have to have kind Type; ones that do not are boxed This function crashes (in wrapBox) if given a non-Type argument that it doesn't know how to box.

# Deconstructing big tuples

mkBigTupleSelector Source #

Arguments

:: [Id] | The `Id`s to pattern match the tuple against
-> Id | The `Id` to select
-> Id | A variable of the same type as the scrutinee
-> CoreExpr | Scrutinee
-> CoreExpr | Selector expression

`mkBigTupleSelectorSolo` is like `mkBigTupleSelector` but one-tuples are NOT flattened (see Note [Flattening one-tuples])

Builds a selector which scrutinises the given expression and extracts the one name from the list given. If you want the no-shadowing rule to apply, the caller is responsible for making sure that none of these names are in scope.

If there is just one `Id` in the tuple, then the selector is just the identity.

If necessary, we pattern match on a "big" tuple.

A tuple selector is not linear in its argument. Consequently, the case expression built by `mkBigTupleSelector` must consume its scrutinee `Many` times. And all the argument variables must have multiplicity `Many`.

mkBigTupleSelectorSolo Source #

Arguments

:: [Id] | The `Id`s to pattern match the tuple against
-> Id | The `Id` to select
-> Id | A variable of the same type as the scrutinee
-> CoreExpr | Scrutinee
-> CoreExpr | Selector expression

Builds a selector which scrutinises the given expression and extracts the one name from the list given. If you want the no-shadowing rule to apply, the caller is responsible for making sure that none of these names are in scope.

If there is just one `Id` in the tuple, then the selector is just the identity.

If necessary, we pattern match on a "big" tuple.

A tuple selector is not linear in its argument. Consequently, the case expression built by `mkBigTupleSelector` must consume its scrutinee `Many` times. And all the argument variables must have multiplicity `Many`.

mkBigTupleCase Source #

Arguments

:: UniqSupply | For inventing names of intermediate variables
-> [Id] | The tuple identifiers to pattern match on; Bring these into scope in the body
-> CoreExpr | Body of the case
-> CoreExpr | Scrutinee
-> CoreExpr |

A generalization of `mkBigTupleSelector`, allowing the body of the case to be an arbitrary expression.

To avoid shadowing, we use uniques to invent new variables.

If necessary we pattern match on a "big" tuple.

# Constructing list expressions

mkNilExpr :: Type -> CoreExpr Source #

Makes a list `[]` for lists of the specified type

mkConsExpr :: Type -> CoreExpr -> CoreExpr -> CoreExpr Source #

Makes a list `(:)` for lists of the specified type

mkListExpr :: Type -> [CoreExpr] -> CoreExpr Source #

Make a list containing the given expressions, where the list has the given type

mkFoldrExpr Source #

Arguments

:: MonadThings m |
=> Type | Element type of the list
-> Type | Fold result type
-> CoreExpr | Cons function expression for the fold
-> CoreExpr | Nil expression for the fold
-> CoreExpr | List expression being folded acress
-> m CoreExpr |

Make a fully applied `foldr` expression

mkBuildExpr Source #

Arguments

:: (MonadFail m, MonadThings m, MonadUnique m) |
=> Type | Type of list elements to be built
-> ((Id, Type) -> (Id, Type) -> m CoreExpr) | Function that, given information about the `Id`s of the binders for the build worker function, returns the body of that worker
-> m CoreExpr |

Make a `build` expression applied to a locally-bound worker function

# Constructing Maybe expressions

mkNothingExpr :: Type -> CoreExpr Source #

Makes a Nothing for the specified type

mkJustExpr :: Type -> CoreExpr -> CoreExpr Source #

Makes a Just from a value of the specified type

# Error Ids

mkRuntimeErrorApp :: Id -> Type -> String -> CoreExpr Source #

mkImpossibleExpr :: Type -> String -> CoreExpr Source #

mkAbsentErrorApp :: Type -> String -> CoreExpr Source #

errorIds :: [Id] Source #

rEC_CON_ERROR_ID :: Id Source #

nON_EXHAUSTIVE_GUARDS_ERROR_ID :: Id Source #

nO_METHOD_BINDING_ERROR_ID :: Id Source #

pAT_ERROR_ID :: Id Source #

rEC_SEL_ERROR_ID :: Id Source #

tYPE_ERROR_ID :: Id Source #

aBSENT_SUM_FIELD_ERROR_ID :: Id Source #