Unused, unused,
Fixity(..), FixityDirection(..),
- defaultFixity, maxPrecedence, negateFixity, negatePrecedence,
+ defaultFixity, maxPrecedence,
+ arrowFixity, negateFixity, negatePrecedence,
+ compareFixity,
+
+ IPName(..), ipNameName, mapIPName,
NewOrData(..),
Boxity(..), isBoxed, tupleParens,
- OccInfo(..), seqOccInfo, isFragileOcc, isDeadOcc, isLoopBreaker,
+ OccInfo(..), seqOccInfo, isFragileOcc, isOneOcc,
+ isDeadOcc, isLoopBreaker,
InsideLam, insideLam, notInsideLam,
OneBranch, oneBranch, notOneBranch,
- EP(..)
+ EP(..),
+
+ StrictnessMark(..), isMarkedUnboxed, isMarkedStrict,
+
+ CompilerPhase,
+ Activation(..), isActive, isNeverActive, isAlwaysActive
) where
#include "HsVersions.h"
%************************************************************************
%* *
+\subsection{Implicit parameter identity}
+%* *
+%************************************************************************
+
+The @IPName@ type is here because it is used in TypeRep (i.e. very
+early in the hierarchy), but also in HsSyn.
+
+\begin{code}
+data IPName name
+ = Dupable name -- ?x: you can freely duplicate this implicit parameter
+ | Linear name -- %x: you must use the splitting function to duplicate it
+ deriving( Eq, Ord ) -- Ord is used in the IP name cache finite map
+ -- (used in HscTypes.OrigIParamCache)
+
+
+ipNameName :: IPName name -> name
+ipNameName (Dupable n) = n
+ipNameName (Linear n) = n
+
+mapIPName :: (a->b) -> IPName a -> IPName b
+mapIPName f (Dupable n) = Dupable (f n)
+mapIPName f (Linear n) = Linear (f n)
+\end{code}
+
+
+%************************************************************************
+%* *
\subsection[Fixity]{Fixity info}
%* *
%************************************************************************
negateFixity :: Fixity
negateFixity = Fixity negatePrecedence InfixL -- Precedence of unary negate is wired in as infixl 6!
+arrowFixity :: Fixity -- Fixity of '->' in types
+arrowFixity = Fixity 0 InfixR
+
negatePrecedence :: Int
negatePrecedence = 6
\end{code}
+Consider
+
+\begin{verbatim}
+ a `op1` b `op2` c
+\end{verbatim}
+@(compareFixity op1 op2)@ tells which way to arrange appication, or
+whether there's an error.
+
+\begin{code}
+compareFixity :: Fixity -> Fixity
+ -> (Bool, -- Error please
+ Bool) -- Associate to the right: a op1 (b op2 c)
+compareFixity (Fixity prec1 dir1) (Fixity prec2 dir2)
+ = case prec1 `compare` prec2 of
+ GT -> left
+ LT -> right
+ EQ -> case (dir1, dir2) of
+ (InfixR, InfixR) -> right
+ (InfixL, InfixL) -> left
+ _ -> error_please
+ where
+ right = (False, True)
+ left = (False, False)
+ error_please = (True, False)
+\end{code}
+
%************************************************************************
%* *
deriving( Eq ) -- Needed because Demand derives Eq
\end{code}
+
%************************************************************************
%* *
\subsection[Top-level/local]{Top-level/not-top level flag}
isDeadOcc IAmDead = True
isDeadOcc other = False
+isOneOcc (OneOcc _ _) = True
+isOneOcc other = False
+
isFragileOcc :: OccInfo -> Bool
isFragileOcc (OneOcc _ _) = True
-isFragileOcc other = False
+isFragileOcc other = False
\end{code}
\begin{code}
showsPrec p occ = showsPrecSDoc p (ppr occ)
\end{code}
+%************************************************************************
+%* *
+\subsection{Strictness indication}
+%* *
+%************************************************************************
+
+The strictness annotations on types in data type declarations
+e.g. data T = MkT !Int !(Bool,Bool)
+
+\begin{code}
+data StrictnessMark
+ = MarkedUserStrict -- "!" in a source decl
+ | MarkedStrict -- "!" in an interface decl: strict but not unboxed
+ | MarkedUnboxed -- "!!" in an interface decl: unboxed
+ | NotMarkedStrict -- No annotation at all
+ deriving( Eq )
+
+isMarkedUnboxed MarkedUnboxed = True
+isMarkedUnboxed other = False
+
+isMarkedStrict NotMarkedStrict = False
+isMarkedStrict other = True -- All others are strict
+
+instance Outputable StrictnessMark where
+ ppr MarkedUserStrict = ptext SLIT("!u")
+ ppr MarkedStrict = ptext SLIT("!")
+ ppr MarkedUnboxed = ptext SLIT("! !")
+ ppr NotMarkedStrict = empty
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Activation}
+%* *
+%************************************************************************
+
+When a rule or inlining is active
+
+\begin{code}
+type CompilerPhase = Int -- Compilation phase
+ -- Phases decrease towards zero
+ -- Zero is the last phase
+
+data Activation = NeverActive
+ | AlwaysActive
+ | ActiveBefore CompilerPhase -- Active only *before* this phase
+ | ActiveAfter CompilerPhase -- Active in this phase and later
+ deriving( Eq ) -- Eq used in comparing rules in HsDecls
+
+instance Outputable Activation where
+ ppr AlwaysActive = empty -- The default
+ ppr (ActiveBefore n) = brackets (char '~' <> int n)
+ ppr (ActiveAfter n) = brackets (int n)
+ ppr NeverActive = ptext SLIT("NEVER")
+
+isActive :: CompilerPhase -> Activation -> Bool
+isActive p NeverActive = False
+isActive p AlwaysActive = True
+isActive p (ActiveAfter n) = p <= n
+isActive p (ActiveBefore n) = p > n
+
+isNeverActive, isAlwaysActive :: Activation -> Bool
+isNeverActive NeverActive = True
+isNeverActive act = False
+
+isAlwaysActive AlwaysActive = True
+isAlwaysActive other = False
+\end{code}
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