ghc-8.0.0.20160204: The GHC API

Safe Haskell	None
Language	Haskell2010

TmOracle

Synopsis

Documentation

data PmExpr Source

Lifted expressions for pattern match checking.

Constructors

PmExprVar Name
PmExprCon DataCon [PmExpr]
PmExprLit PmLit
PmExprEq PmExpr PmExpr
PmExprOther (HsExpr Id)

Instances

Outputable PmExpr
Methods ppr :: PmExpr -> SDoc Source pprPrec :: Rational -> PmExpr -> SDoc Source

data PmLit Source

Literals (simple and overloaded ones) for pattern match checking.

Constructors

PmSLit HsLit
PmOLit Bool (HsOverLit Id)

Instances

Outputable PmLit
Methods ppr :: PmLit -> SDoc Source pprPrec :: Rational -> PmLit -> SDoc Source

type SimpleEq = (Id, PmExpr) Source

Term equalities

type ComplexEq = (PmExpr, PmExpr) Source

type PmVarEnv = Map Name PmExpr Source

The type of substitutions.

falsePmExpr :: PmExpr Source

Expression False

eqPmLit :: PmLit -> PmLit -> Bool Source

Equality between literals for pattern match checking.

filterComplex :: [ComplexEq] -> [PmNegLitCt] Source

isNotPmExprOther :: PmExpr -> Bool Source

Check if an expression is lifted or not

runPmPprM :: PmPprM a -> [PmNegLitCt] -> (a, [(SDoc, [PmLit])]) Source

lhsExprToPmExpr :: LHsExpr Id -> PmExpr Source

hsExprToPmExpr :: HsExpr Id -> PmExpr Source

pprPmExprWithParens :: PmExpr -> PmPprM SDoc Source

tmOracle :: TmState -> [ComplexEq] -> Maybe TmState Source

External interface to the term oracle.

type TmState = ([ComplexEq], TmOracleEnv) Source

The state of the term oracle (includes complex constraints that cannot progress unless we get more information).

initialTmState :: TmState Source

Initial state of the oracle.

solveOneEq :: TmState -> ComplexEq -> Maybe TmState Source

Solve a complex equality (top-level).

extendSubst :: Id -> PmExpr -> TmState -> TmState Source

When we know that a variable is fresh, we do not actually have to check whether anything changes, we know that nothing does. Hence, extendSubst simply extends the substitution, unlike what extendSubstAndSolve does.

canDiverge :: Name -> TmState -> Bool Source

Check whether a constraint (x ~ BOT) can succeed, given the resulting state of the term oracle.

toComplex :: SimpleEq -> ComplexEq Source

Lift a SimpleEq to a ComplexEq

exprDeepLookup :: PmVarEnv -> PmExpr -> PmExpr Source

Apply an (un-flattened) substitution to an expression.

pmLitType :: PmLit -> Type Source

Type of a PmLit

flattenPmVarEnv :: PmVarEnv -> PmVarEnv Source

Flatten the DAG (Could be improved in terms of performance.).