ghc-7.8.4: The GHC API

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LanguageHaskell98

Rules

Contents

Description

Functions for collecting together and applying rewrite rules to a module. The CoreRule datatype itself is declared elsewhere.

Synopsis

RuleBase

type RuleBase = NameEnv [CoreRule] Source

Gathers a collection of CoreRules. Maps (the name of) an Id to its rules

Constructing

emptyRuleBase :: RuleBase Source

mkRuleBase :: [CoreRule] -> RuleBase Source

extendRuleBaseList :: RuleBase -> [CoreRule] -> RuleBase Source

unionRuleBase :: RuleBase -> RuleBase -> RuleBase Source

pprRuleBase :: RuleBase -> SDoc Source

Checking rule applications

ruleCheckProgram Source

Arguments

:: CompilerPhase

Rule activation test

-> String

Rule pattern

-> RuleBase

Database of rules

-> CoreProgram

Bindings to check in

-> SDoc

Resulting check message

Report partial matches for rules beginning with the specified string for the purposes of error reporting

Manipulating SpecInfo rules

mkSpecInfo :: [CoreRule] -> SpecInfo Source

Make a SpecInfo containing a number of CoreRules, suitable for putting into an IdInfo

extendSpecInfo :: SpecInfo -> [CoreRule] -> SpecInfo Source

addSpecInfo :: SpecInfo -> SpecInfo -> SpecInfo Source

addIdSpecialisations :: Id -> [CoreRule] -> Id Source

Misc. CoreRule helpers

rulesOfBinds :: [CoreBind] -> [CoreRule] Source

Gather all the rules for locally bound identifiers from the supplied bindings

getRules :: RuleBase -> Id -> [CoreRule] Source

pprRulesForUser :: [CoreRule] -> SDoc Source

lookupRule :: DynFlags -> InScopeEnv -> (Activation -> Bool) -> Id -> [CoreExpr] -> [CoreRule] -> Maybe (CoreRule, CoreExpr) Source

The main rule matching function. Attempts to apply all (active) supplied rules to this instance of an application in a given context, returning the rule applied and the resulting expression if successful.

mkRule :: Bool -> Bool -> RuleName -> Activation -> Name -> [CoreBndr] -> [CoreExpr] -> CoreExpr -> CoreRule Source

Used to make CoreRule for an Id defined in the module being compiled. See also CoreRule

roughTopNames :: [CoreExpr] -> [Maybe Name] Source

Find the "top" free names of several expressions. Such names are either:

  1. The function finally being applied to in an application chain (if that name is a GlobalId: see Var), or
  2. The TyCon if the expression is a Type

This is used for the fast-match-check for rules; if the top names don't match, the rest can't