DDC.Core.Exp.Simple.Exp

Core language AST with a separate node to hold annotations.

This version of the AST is used when generating code where most or all of the annotations would be empty. General purpose transformations should deal with the fully annotated version of the AST instead.

Documentation

module DDC.Type.Exp

Expressions

data Exp a n

Well-typed expressions have types of kind Data.

Constructors

XAnnot a (Exp a n)

Annotation.

XVar !(Bound n)

Value variable or primitive operation.

XCon !(DaCon n)

Data constructor or literal.

XLAM !(Bind n) !(Exp a n)

Type abstraction (level-1).

XLam !(Bind n) !(Exp a n)

Value and Witness abstraction (level-0).

XApp !(Exp a n) !(Exp a n)

Application.

XLet !(Lets a n) !(Exp a n)

Possibly recursive bindings.

XCase !(Exp a n) ![Alt a n]

Case branching.

XCast !(Cast a n) !(Exp a n)

Type cast.

XType !(Type n)

Type can appear as the argument of an application.

XWitness !(Witness a n)

Witness can appear as the argument of an application.

Instances

Annotate Exp Exp

Deannotate Exp Exp

(Eq a, Eq n) => Eq (Exp a n)

(Show a, Show n) => Show (Exp a n)

(NFData a, NFData n) => NFData (Exp a n)

data Cast a n

Type casts.

Constructors

CastWeakenEffect !(Effect n)

Weaken the effect of an expression. The given effect is added to the effect of the body.

CastPurify !(Witness a n)

Purify the effect (action) of an expression.

CastBox

Box up a computation, capturing its effects in the S computation type.

CastRun

Run a computation, releasing its effects into the environment.

Instances

Annotate Cast Cast

Deannotate Cast Cast

(Eq a, Eq n) => Eq (Cast a n)

(Show a, Show n) => Show (Cast a n)

(NFData a, NFData n) => NFData (Cast a n)

data Lets a n

Possibly recursive bindings.

Constructors

LLet !(Bind n) !(Exp a n)

Non-recursive expression binding.

LRec ![(Bind n, Exp a n)]

Recursive binding of lambda abstractions.

LPrivate ![Bind n] !(Maybe (Type n)) ![Bind n]

Bind a local region variable, and witnesses to its properties.

Instances

Annotate Lets Lets

Deannotate Lets Lets

(Eq a, Eq n) => Eq (Lets a n)

(Show a, Show n) => Show (Lets a n)

(NFData a, NFData n) => NFData (Lets a n)

data Alt a n

Case alternatives.

Constructors

AAlt !(Pat n) !(Exp a n)

Instances

Annotate Alt Alt

Deannotate Alt Alt

(Eq a, Eq n) => Eq (Alt a n)

(Show a, Show n) => Show (Alt a n)

(NFData a, NFData n) => NFData (Alt a n)

data Pat n

Pattern matching.

Constructors

PDefault

The default pattern always succeeds.

PData !(DaCon n) ![Bind n]

Match a data constructor and bind its arguments.

Instances

Eq n => Eq (Pat n)

Show n => Show (Pat n)

NFData n => NFData (Pat n)

Witnesses

data Witness a n

When a witness exists in the program it guarantees that a certain property of the program is true.

Constructors

WAnnot a (Witness a n)

WVar !(Bound n)

Witness variable.

WCon !(WiCon n)

Witness constructor.

WApp !(Witness a n) !(Witness a n)

Witness application.

WType !(Type n)

Type can appear as the argument of an application.

Instances

Annotate Witness Witness

Deannotate Witness Witness

(Eq a, Eq n) => Eq (Witness a n)

(Show a, Show n) => Show (Witness a n)

(NFData a, NFData n) => NFData (Witness a n)

Data Constructors

data DaCon n

Data constructors.

Constructors

DaConUnit

Baked in unit data constructor.

DaConPrim

Primitive data constructor used for literals and baked-in constructors.

The type of the constructor needs to be attached to handle the case where there are too many constructors in the data type to list, like for Int literals. In this case we determine what data type it belongs to from the attached type of the data constructor.

Fields

daConName :: !n

Name of the data constructor.

daConType :: !(Type n)

Type of the data constructor.

DaConBound

Data constructor that has a data type declaration.

Fields

daConName :: !n

Name of the data constructor.

Instances

SpreadX DaCon

Eq n => Eq (DaCon n)

Show n => Show (DaCon n)

NFData n => NFData (DaCon n)

Witness Constructors

data WiCon n

Witness constructors.

Constructors

WiConBound !(Bound n) !(Type n)

Witness constructors defined in the environment. In the interpreter we use this to hold runtime capabilities. The attached type must be closed.

Instances

SpreadX WiCon

Eq n => Eq (WiCon n)

Show n => Show (WiCon n)

NFData n => NFData (WiCon n)