futhark-0.11.0: An optimising compiler for a functional, array-oriented language.

Language.Futhark.Traversals

Description

Functions for generic traversals across Futhark syntax trees. The motivation for this module came from dissatisfaction with rewriting the same trivial tree recursions for every module. A possible alternative would be to use normal "Scrap your boilerplate"-techniques, but these are rejected for two reasons:

• They are too slow.
• More importantly, they do not tell you whether you have missed some cases.

Instead, this module defines various traversals of the Futhark syntax tree. The implementation is rather tedious, but the interface is easy to use.

A traversal of the Futhark syntax tree is expressed as a record of functions expressing the operations to be performed on the various types of nodes.

Synopsis

# Documentation

data ASTMapper m Source #

Express a monad mapping operation on a syntax node. Each element of this structure expresses the operation to be performed on a given child.

Constructors

 ASTMapper FieldsmapOnExp :: ExpBase Info VName -> m (ExpBase Info VName) mapOnName :: VName -> m VName mapOnQualName :: QualName VName -> m (QualName VName) mapOnStructType :: StructType -> m StructType mapOnPatternType :: PatternType -> m PatternType

class ASTMappable x where Source #

Methods

astMap :: Monad m => ASTMapper m -> x -> m x Source #

Map a monadic action across the immediate children of an object. Importantly, the astMap action is not invoked for the object itself, and the mapping does not descend recursively into subexpressions. The mapping is done left-to-right.

Instances