| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
IdInfo
Contents
- data IdDetails
- pprIdDetails :: IdDetails -> SDoc
- coVarDetails :: IdDetails
- isCoVarDetails :: IdDetails -> Bool
- type JoinArity = Int
- isJoinIdDetails_maybe :: IdDetails -> Maybe JoinArity
- data RecSelParent
- data IdInfo
- vanillaIdInfo :: IdInfo
- noCafIdInfo :: IdInfo
- data OneShotInfo
- oneShotInfo :: IdInfo -> OneShotInfo
- noOneShotInfo :: OneShotInfo
- hasNoOneShotInfo :: OneShotInfo -> Bool
- setOneShotInfo :: IdInfo -> OneShotInfo -> IdInfo
- zapLamInfo :: IdInfo -> Maybe IdInfo
- zapFragileInfo :: IdInfo -> Maybe IdInfo
- zapDemandInfo :: IdInfo -> Maybe IdInfo
- zapUsageInfo :: IdInfo -> Maybe IdInfo
- zapUsageEnvInfo :: IdInfo -> Maybe IdInfo
- zapUsedOnceInfo :: IdInfo -> Maybe IdInfo
- zapTailCallInfo :: IdInfo -> Maybe IdInfo
- zapCallArityInfo :: IdInfo -> IdInfo
- type ArityInfo = Arity
- unknownArity :: Arity
- arityInfo :: IdInfo -> ArityInfo
- setArityInfo :: IdInfo -> ArityInfo -> IdInfo
- ppArityInfo :: Int -> SDoc
- callArityInfo :: IdInfo -> ArityInfo
- setCallArityInfo :: IdInfo -> ArityInfo -> IdInfo
- strictnessInfo :: IdInfo -> StrictSig
- setStrictnessInfo :: IdInfo -> StrictSig -> IdInfo
- demandInfo :: IdInfo -> Demand
- setDemandInfo :: IdInfo -> Demand -> IdInfo
- pprStrictness :: StrictSig -> SDoc
- unfoldingInfo :: IdInfo -> Unfolding
- setUnfoldingInfo :: IdInfo -> Unfolding -> IdInfo
- type InlinePragInfo = InlinePragma
- inlinePragInfo :: IdInfo -> InlinePragma
- setInlinePragInfo :: IdInfo -> InlinePragma -> IdInfo
- data OccInfo
- = ManyOccs {
- occ_tail :: !TailCallInfo
- | IAmDead
- | OneOcc { }
- | IAmALoopBreaker {
- occ_rules_only :: !RulesOnly
- occ_tail :: !TailCallInfo
- = ManyOccs {
- isDeadOcc :: OccInfo -> Bool
- isStrongLoopBreaker :: OccInfo -> Bool
- isWeakLoopBreaker :: OccInfo -> Bool
- occInfo :: IdInfo -> OccInfo
- setOccInfo :: IdInfo -> OccInfo -> IdInfo
- type InsideLam = Bool
- type OneBranch = Bool
- insideLam :: InsideLam
- notInsideLam :: InsideLam
- oneBranch :: OneBranch
- notOneBranch :: OneBranch
- data TailCallInfo
- tailCallInfo :: OccInfo -> TailCallInfo
- isAlwaysTailCalled :: OccInfo -> Bool
- data RuleInfo = RuleInfo [CoreRule] DVarSet
- emptyRuleInfo :: RuleInfo
- isEmptyRuleInfo :: RuleInfo -> Bool
- ruleInfoFreeVars :: RuleInfo -> DVarSet
- ruleInfoRules :: RuleInfo -> [CoreRule]
- setRuleInfoHead :: Name -> RuleInfo -> RuleInfo
- ruleInfo :: IdInfo -> RuleInfo
- setRuleInfo :: IdInfo -> RuleInfo -> IdInfo
- data CafInfo
- ppCafInfo :: CafInfo -> SDoc
- mayHaveCafRefs :: CafInfo -> Bool
- cafInfo :: IdInfo -> CafInfo
- setCafInfo :: IdInfo -> CafInfo -> IdInfo
- data TickBoxOp = TickBox Module !TickBoxId
- type TickBoxId = Int
- data LevityInfo
- levityInfo :: IdInfo -> LevityInfo
- setNeverLevPoly :: HasDebugCallStack => IdInfo -> Type -> IdInfo
- setLevityInfoWithType :: IdInfo -> Type -> IdInfo
- isNeverLevPolyIdInfo :: IdInfo -> Bool
The IdDetails type
Identifier Details
The IdDetails of an Id give stable, and necessary,
information about the Id.
Constructors
| VanillaId | |
| RecSelId | The |
Fields
| |
| DataConWorkId DataCon | The |
| DataConWrapId DataCon | The |
| ClassOpId Class | The |
| PrimOpId PrimOp | The |
| FCallId ForeignCall | The |
| TickBoxOpId TickBoxOp | The |
| DFunId Bool | A dictionary function. Bool = True = the class has only one method, so may be implemented with a newtype, so it might be bad to be strict on this dictionary |
| CoVarId | A coercion variable This only covers un-lifted coercions, of type (t1 ~ t2), not their lifted variants |
| JoinId JoinArity | An |
Instances
pprIdDetails :: IdDetails -> SDoc Source #
coVarDetails :: IdDetails Source #
Just a synonym for CoVarId. Written separately so it can be
exported in the hs-boot file.
The number of arguments that a join point takes. Unlike the arity of a function, this is a purely syntactic property and is fixed when the join point is created (or converted from a value). Both type and value arguments are counted.
data RecSelParent Source #
Recursive Selector Parent
Constructors
| RecSelData TyCon | |
| RecSelPatSyn PatSyn |
Instances
The IdInfo type
Identifier Information
An IdInfo gives optional information about an Id. If
present it never lies, but it may not be present, in which case there
is always a conservative assumption which can be made.
Two Ids may have different info even though they have the same
Unique (and are hence the same Id); for example, one might lack
the properties attached to the other.
Most of the IdInfo gives information about the value, or definition, of
the Id, independent of its usage. Exceptions to this
are demandInfo, occInfo, oneShotInfo and callArityInfo.
Performance note: when we update IdInfo, we have to reallocate this
entire record, so it is a good idea not to let this data structure get
too big.
vanillaIdInfo :: IdInfo Source #
Basic IdInfo that carries no useful information whatsoever
noCafIdInfo :: IdInfo Source #
More informative IdInfo we can use when we know the Id has no CAF references
The OneShotInfo type
data OneShotInfo Source #
If the Id is a lambda-bound variable then it may have lambda-bound
variable info. Sometimes we know whether the lambda binding this variable
is a "one-shot" lambda; that is, whether it is applied at most once.
This information may be useful in optimisation, as computations may safely be floated inside such a lambda without risk of duplicating work.
Constructors
| NoOneShotInfo | No information |
| OneShotLam | The lambda is applied at most once. |
Instances
oneShotInfo :: IdInfo -> OneShotInfo Source #
Info about a lambda-bound variable, if the Id is one
noOneShotInfo :: OneShotInfo Source #
It is always safe to assume that an Id has no lambda-bound variable information
hasNoOneShotInfo :: OneShotInfo -> Bool Source #
setOneShotInfo :: IdInfo -> OneShotInfo -> IdInfo infixl 1 Source #
Zapping various forms of Info
zapLamInfo :: IdInfo -> Maybe IdInfo Source #
This is used to remove information on lambda binders that we have setup as part of a lambda group, assuming they will be applied all at once, but turn out to be part of an unsaturated lambda as in e.g:
(\x1. \x2. e) arg1
zapUsageEnvInfo :: IdInfo -> Maybe IdInfo Source #
Remove usage environment info from the strictness signature on the IdInfo
zapCallArityInfo :: IdInfo -> IdInfo Source #
The ArityInfo type
type ArityInfo = Arity Source #
Arity Information
An ArityInfo of n tells us that partial application of this
Id to up to n-1 value arguments does essentially no work.
That is not necessarily the same as saying that it has n leading
lambdas, because coerces may get in the way.
The arity might increase later in the compilation process, if an extra lambda floats up to the binding site.
unknownArity :: Arity Source #
It is always safe to assume that an Id has an arity of 0
ppArityInfo :: Int -> SDoc Source #
callArityInfo :: IdInfo -> ArityInfo Source #
How this is called. n = all calls have at least n arguments
Demand and strictness Info
strictnessInfo :: IdInfo -> StrictSig Source #
demandInfo :: IdInfo -> Demand Source #
ID demand information
pprStrictness :: StrictSig -> SDoc Source #
Unfolding Info
unfoldingInfo :: IdInfo -> Unfolding Source #
The Ids unfolding
The InlinePragInfo type
type InlinePragInfo = InlinePragma Source #
Inline Pragma Information
Tells when the inlining is active. When it is active the thing may be inlined, depending on how big it is.
If there was an INLINE pragma, then as a separate matter, the
RHS will have been made to look small with a Core inline Note
The default InlinePragInfo is AlwaysActive, so the info serves
entirely as a way to inhibit inlining until we want it
inlinePragInfo :: IdInfo -> InlinePragma Source #
Any inline pragma atached to the Id
setInlinePragInfo :: IdInfo -> InlinePragma -> IdInfo infixl 1 Source #
The OccInfo type
identifier Occurrence Information
Constructors
| ManyOccs | There are many occurrences, or unknown occurrences |
Fields
| |
| IAmDead | Marks unused variables. Sometimes useful for lambda and case-bound variables. |
| OneOcc | Occurs exactly once (per branch), not inside a rule |
Fields
| |
| IAmALoopBreaker | This identifier breaks a loop of mutually recursive functions. The field marks whether it is only a loop breaker due to a reference in a rule |
Fields
| |
isStrongLoopBreaker :: OccInfo -> Bool Source #
isWeakLoopBreaker :: OccInfo -> Bool Source #
tailCallInfo :: OccInfo -> TailCallInfo Source #
isAlwaysTailCalled :: OccInfo -> Bool Source #
The RuleInfo type
Rule Information
Records the specializations of this Id that we know about
in the form of rewrite CoreRules that target them
emptyRuleInfo :: RuleInfo Source #
Assume that no specilizations exist: always safe
isEmptyRuleInfo :: RuleInfo -> Bool Source #
ruleInfoFreeVars :: RuleInfo -> DVarSet Source #
Retrieve the locally-defined free variables of both the left and right hand sides of the specialization rules
ruleInfoRules :: RuleInfo -> [CoreRule] Source #
setRuleInfoHead :: Name -> RuleInfo -> RuleInfo Source #
Change the name of the function the rule is keyed on on all of the CoreRules
ruleInfo :: IdInfo -> RuleInfo Source #
Specialisations of the Ids function which exist
See Note [Specialisations and RULES in IdInfo]
The CAFInfo type
Constant applicative form Information
Records whether an Id makes Constant Applicative Form references
Constructors
| MayHaveCafRefs | Indicates that the
|
| NoCafRefs | A function or static constructor that refers to no CAFs. |
mayHaveCafRefs :: CafInfo -> Bool Source #
Tick-box Info
Tick box for Hpc-style coverage
Instances
Levity info
data LevityInfo Source #
Instances
levityInfo :: IdInfo -> LevityInfo Source #
when applied, will this Id ever have a levity-polymorphic type?
setNeverLevPoly :: HasDebugCallStack => IdInfo -> Type -> IdInfo infixl 1 Source #
Marks an IdInfo describing an Id that is never levity polymorphic (even when applied). The Type is only there for checking that it's really never levity polymorphic
isNeverLevPolyIdInfo :: IdInfo -> Bool Source #