Unused, unused,
- Fixity(..), FixityDirection(..),
- defaultFixity, maxPrecedence, negateFixity, negatePrecedence,
+ FixitySig(..), Fixity(..), FixityDirection(..),
+ 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,
StrictnessMark(..), isMarkedUnboxed, isMarkedStrict,
- CompilerPhase, pprPhase,
- Activation(..), isActive, isNeverActive, isAlwaysActive
+ CompilerPhase,
+ Activation(..), isActive, isNeverActive, isAlwaysActive,
+
+ SuccessFlag(..), succeeded, failed, successIf
) where
#include "HsVersions.h"
import Outputable
+import SrcLoc
\end{code}
%************************************************************************
%************************************************************************
%* *
+\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}
%* *
%************************************************************************
\begin{code}
+------------------------
+data FixitySig name = FixitySig name Fixity SrcLoc
+
+instance Eq name => Eq (FixitySig name) where
+ (FixitySig n1 f1 _) == (FixitySig n2 f2 _) = n1==n2 && f1==f2
+
+instance Outputable name => Outputable (FixitySig name) where
+ ppr (FixitySig name fixity loc) = sep [ppr fixity, ppr name]
+
+------------------------
data Fixity = Fixity Int FixityDirection
-data FixityDirection = InfixL | InfixR | InfixN
- deriving(Eq)
instance Outputable Fixity where
ppr (Fixity prec dir) = hcat [ppr dir, space, int prec]
+instance Eq Fixity where -- Used to determine if two fixities conflict
+ (Fixity p1 dir1) == (Fixity p2 dir2) = p1==p2 && dir1 == dir2
+
+------------------------
+data FixityDirection = InfixL | InfixR | InfixN
+ deriving(Eq)
+
instance Outputable FixityDirection where
ppr InfixL = ptext SLIT("infixl")
ppr InfixR = ptext SLIT("infixr")
ppr InfixN = ptext SLIT("infix")
-instance Eq Fixity where -- Used to determine if two fixities conflict
- (Fixity p1 dir1) == (Fixity p2 dir2) = p1==p2 && dir1 == dir2
-
+------------------------
maxPrecedence = (9::Int)
defaultFixity = Fixity maxPrecedence InfixL
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}
+
%************************************************************************
%* *
isDeadOcc IAmDead = True
isDeadOcc other = False
+isOneOcc (OneOcc _ _) = True
+isOneOcc other = False
+
isFragileOcc :: OccInfo -> Bool
isFragileOcc (OneOcc _ _) = True
isFragileOcc other = False
%************************************************************************
%* *
+\subsection{Success flag}
+%* *
+%************************************************************************
+
+\begin{code}
+data SuccessFlag = Succeeded | Failed
+
+successIf :: Bool -> SuccessFlag
+successIf True = Succeeded
+successIf False = Failed
+
+succeeded, failed :: SuccessFlag -> Bool
+succeeded Succeeded = True
+succeeded Failed = False
+
+failed Succeeded = False
+failed Failed = True
+\end{code}
+
+
+%************************************************************************
+%* *
\subsection{Activation}
%* *
%************************************************************************
-- Phases decrease towards zero
-- Zero is the last phase
-pprPhase :: CompilerPhase -> SDoc
-pprPhase n = brackets (int n)
-
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 (ActiveAfter n) = pprPhase n
- ppr NeverActive = ptext SLIT("NEVER")
+ 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 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
isAlwaysActive AlwaysActive = True
isAlwaysActive other = False
\end{code}
+
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