CLaSH.Rewrite.Util

Utilities for rewriting: e.g. inlining, specialisation, etc.

Documentation

liftR :: Monad m => m a -> RewriteMonad m a

Lift an action working in the inner monad to the RewriteMonad

liftRS :: Monad m => m a -> RewriteSession m a

Lift an action working in the inner monad to the RewriteSession

apply

Arguments

:: (Monad m, Functor m)

=> String

Name of the transformation

-> Rewrite m

Transformation to be applied

-> Rewrite m

Record if a transformation is succesfully applied

runRewrite

Arguments

:: (Monad m, Functor m)

=> String

Name of the transformation

-> Rewrite m

Transformation to perform

-> Term

Term to transform

-> RewriteSession m Term

Perform a transformation on a Term

runRewriteSession :: (Functor m, Monad m) => DebugLevel -> RewriteState -> RewriteSession m a -> m a

Evaluate a RewriteSession to its inner monad

setChanged :: Monad m => RewriteMonad m ()

Notify that a transformation has changed the expression

changed :: Monad m => a -> RewriteMonad m a

Identity function that additionally notifies that a transformation has changed the expression

contextEnv :: [CoreContext] -> (Gamma, Delta)

Create a type and kind context out of a transformation context

mkEnv :: (Functor m, Monad m) => [CoreContext] -> RewriteMonad m (Gamma, Delta)

Create a complete type and kind context out of the global binders and the transformation context

mkTmBinderFor

Arguments

:: (Functor m, Fresh m, MonadUnique m)

=> HashMap TyConName TyCon

TyCon cache

-> String

Name of the new binder

-> Term

Term to bind

-> m (Id, Term)

Make a new binder and variable reference for a term

mkBinderFor

Arguments

:: (Functor m, Monad m, MonadUnique m, Fresh m)

=> HashMap TyConName TyCon

TyCon cache

-> String

Name of the new binder

-> Either Term Type

Type or Term to bind

-> m (Either (Id, Term) (TyVar, Type))

Make a new binder and variable reference for either a term or a type

mkInternalVar

Arguments

:: (Functor m, Monad m, MonadUnique m)

=> String

Name of the identifier

-> KindOrType

-> m (Id, Term)

Make a new, unique, identifier and corresponding variable reference

inlineBinders

Arguments

:: Monad m

=> (LetBinding -> RewriteMonad m Bool)

Property test

-> Rewrite m

Inline the binders in a let-binding that have a certain property

substituteBinders

Arguments

:: [LetBinding]

Let-binders to substitute

-> [LetBinding]

Let-binders where substitution takes place

-> Term

Expression where substitution takes place

-> ([LetBinding], Term)

Substitute the RHS of the first set of Let-binders for references to the first set of Let-binders in: the second set of Let-binders and the additional term

localFreeVars :: (Functor m, Monad m, Collection c) => Term -> RewriteMonad m (c TyName, c TmName)

Calculate the local free variable of an expression: the free variables that are not bound in the global environment.

liftBinders

Arguments

:: (Functor m, Monad m)

=> (LetBinding -> RewriteMonad m Bool)

Property test

-> Rewrite m

Lift the binders in a let-binding to a global function that have a certain property

liftBinding :: (Functor m, Monad m) => Gamma -> Delta -> LetBinding -> RewriteMonad m LetBinding

Create a global function for a Let-binding and return a Let-binding where the RHS is a reference to the new global function applied to the free variables of the original RHS

mkFunction

Arguments

:: (Functor m, Monad m)

=> TmName

Name of the function

-> Term

Term bound to the function

-> RewriteMonad m (TmName, Type)

Name with a proper unique and the type of the function

Make a global function for a name-term tuple

addGlobalBind :: (Functor m, Monad m) => TmName -> Type -> Term -> RewriteMonad m ()

Add a function to the set of global binders

cloneVar :: (Functor m, Monad m) => TmName -> RewriteMonad m TmName

Create a new name out of the given name, but with another unique

isLocalVar :: (Functor m, Monad m) => Term -> RewriteMonad m Bool

Test whether a term is a variable reference to a local binder

isUntranslatable :: (Functor m, Monad m) => Term -> RewriteMonad m Bool

Determine if a term cannot be represented in hardware

isLambdaBodyCtx :: CoreContext -> Bool

Is the Context a Lambda/Term-abstraction context?

mkWildValBinder :: (Functor m, Monad m, MonadUnique m) => Type -> m Id

Make a binder that should not be referenced

mkSelectorCase

Arguments

:: (Functor m, Monad m, MonadUnique m, Fresh m)

=> String

Name of the caller of this function

-> HashMap TyConName TyCon

TyCon cache

-> [CoreContext]

Transformation Context in which this function is called

-> Term

Subject of the case-composition

-> Int

-> Int

-> m Term

Make a case-decomposition that extracts a field out of a (Sum-of-)Product type

specialise

Arguments

:: (Functor m, MonadState s m)

=> Lens' s (Map (TmName, Int, Either Term Type) (TmName, Type))

Lens into previous specialisations

-> Lens' s (HashMap TmName Int)

Lens into the specialisation history

-> Lens' s Int

Lens into the specialisation limit

-> Bool

-> Rewrite m

Specialise an application on its argument

specialise'

Arguments

:: (Functor m, MonadState s m)

=> Lens' s (Map (TmName, Int, Either Term Type) (TmName, Type))

Lens into previous specialisations

-> Lens' s (HashMap TmName Int)

Lens into specialisation history

-> Lens' s Int

Lens into the specialisation limit

-> Bool

Perform specialisation limit check

-> [CoreContext]

-> Term

Original term

-> (Term, [Either Term Type])

Function part of the term, split into root and applied arguments

-> Either Term Type

Argument to specialize on

-> R m Term

Specialise an application on its argument

specArgBndrsAndVars :: (Functor m, Monad m) => [CoreContext] -> Either Term Type -> RewriteMonad m ([Either Id TyVar], [Either Term Type])

Create binders and variable references for free variables in specArg