Rules

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

Constructing

emptyRuleBase :: RuleBase

mkRuleBase :: [CoreRule] -> RuleBase

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

unionRuleBase :: RuleBase -> RuleBase -> RuleBase

pprRuleBase :: RuleBase -> SDoc

Checking rule applications

ruleCheckProgram

Arguments

:: CompilerPhase

Rule activation test

-> String

Rule pattern

-> (Id -> [CoreRule])

Rules for an Id

-> 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 RuleInfo rules

mkRuleInfo :: [CoreRule] -> RuleInfo

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

extendRuleInfo :: RuleInfo -> [CoreRule] -> RuleInfo

addRuleInfo :: RuleInfo -> RuleInfo -> RuleInfo

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

Misc. CoreRule helpers

rulesOfBinds :: [CoreBind] -> [CoreRule]

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

getRules :: RuleEnv -> Id -> [CoreRule]

pprRulesForUser :: DynFlags -> [CoreRule] -> SDoc

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

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

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

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

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 Expr

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