ghc-8.0.2: The GHC API

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



Checking rule applications

ruleCheckProgram #


:: CompilerPhase

Rule activation test

-> String

Rule pattern

-> RuleEnv

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 RuleInfo rules

mkRuleInfo :: [CoreRule] -> RuleInfo #

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

Misc. CoreRule helpers

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

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

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 Type

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