CaptureChecker
Members list
Value members
Concrete methods
Adapt actual type to expected type by inserting boxing and unboxing conversions
Adapt actual type to expected type by inserting boxing and unboxing conversions
Value parameters
- alwaysConst
-
always make capture set variables constant after adaptation
Attributes
Assert subcapturing cs1 <: cs2
Assert subcapturing cs1 <: cs2
Attributes
If sym is a class or method nested inside a term, a capture set variable representing the captured variables of the environment associated with sym.
If sym is a class or method nested inside a term, a capture set variable representing the captured variables of the environment associated with sym.
Attributes
Massage actual and expected types using the methods below before checking conformance
Massage actual and expected types using the methods below before checking conformance
Attributes
- Definition Classes
Check subcapturing {elem} <: cs, report error on failure
Check subcapturing {elem} <: cs, report error on failure
Attributes
Check overrides again, taking capture sets into account. TODO: Can we avoid doing overrides checks twice? We need to do them here since only at this phase CaptureTypes are relevant But maybe we can then elide the check during the RefChecks phase under captureChecking?
Check overrides again, taking capture sets into account. TODO: Can we avoid doing overrides checks twice? We need to do them here since only at this phase CaptureTypes are relevant But maybe we can then elide the check during the RefChecks phase under captureChecking?
Attributes
Check that self types of subclasses conform to self types of super classes. (See comment below how this is achieved). The check assumes that classes without an explicit self type have the universal capture set {cap} on the self type. If a class without explicit self type is not effectivelyFinal it is checked that the inferred self type is universal, in order to assure that joint and separate compilation give the same result.
Check that self types of subclasses conform to self types of super classes. (See comment below how this is achieved). The check assumes that classes without an explicit self type have the universal capture set {cap} on the self type. If a class without explicit self type is not effectivelyFinal it is checked that the inferred self type is universal, in order to assure that joint and separate compilation give the same result.
Attributes
Check subcapturing cs1 <: cs2, report error on failure
Check subcapturing cs1 <: cs2, report error on failure
Attributes
Attributes
- Definition Classes
For all nested environments up to limit or a closed environment perform op, but skip environmenrts directly enclosing environments of kind ClosureResult.
For all nested environments up to limit or a closed environment perform op, but skip environmenrts directly enclosing environments of kind ClosureResult.
Attributes
Include references captured by the called method in the current environment stack
Include references captured by the called method in the current environment stack
Attributes
Handle an application of method sym with type mt to arguments of types argTypes. This means:
Handle an application of method sym with type mt to arguments of types argTypes. This means:
- Instantiate result type with actual arguments
- If call is to a constructor:
- remember types of arguments corresponding to tracked parameters in refinements.
- add capture set of instantiated class to capture set of result type.
Attributes
- Definition Classes
Should type of tree be kept in an attachment so that it can be retrieved with knownType? By default true only is keepAllTypes hold, but can be overridden.
Should type of tree be kept in an attachment so that it can be retrieved with knownType? By default true only is keepAllTypes hold, but can be overridden.
Attributes
- Definition Classes
Include sym in the capture sets of all enclosing environments nested in the the environment in which sym is defined.
Include sym in the capture sets of all enclosing environments nested in the the environment in which sym is defined.
Attributes
Make sure (projected) cs is a subset of the capture sets of all enclosing environments. At each stage, only include references from cs that are outside the environment's owner
Make sure (projected) cs is a subset of the capture sets of all enclosing environments. At each stage, only include references from cs that are outside the environment's owner
Attributes
Perform the following kinds of checks
Perform the following kinds of checks
- Check all explicitly written capturing types for well-formedness using
checkWellFormedPost. - Check that externally visible
vals ordefs have empty capture sets. If not, suggest an explicit type. This is so that separate compilation (where external symbols have empty capture sets) gives the same results as joint compilation. - Check that arguments of TypeApplys and AppliedTypes conform to their bounds.
- Heal ill-formed capture sets of type parameters. See
healTypeParam.
Attributes
If expected type pt is boxed and the tree is a function or a reference, don't propagate free variables. Otherwise, if the result type is boxed, simulate an unboxing by adding all references in the boxed capture set to the current environment.
If expected type pt is boxed and the tree is a function or a reference, don't propagate free variables. Otherwise, if the result type is boxed, simulate an unboxing by adding all references in the boxed capture set to the current environment.
Attributes
- Definition Classes
A specialized implementation of the apply rule.
A specialized implementation of the apply rule.
E |- f: Ra ->Cf Rr^Cr E |- a: Ra^Ca
E |- f a: Rr^C
The implementation picks as C one of {f, a} or Cr, depending on the outcome of a mightSubcapture test. It picks {f, a} if this might subcapture Cr and Cr otherwise.
Attributes
- Definition Classes
Additionally to normal processing, update types of closures if the expected type is a function with only pure parameters. In that case, make the anonymous function also have the same parameters as the prototype. TODO: Develop a clearer rationale for this. TODO: Can we generalize this to arbitrary parameters? Currently some tests fail if we do this. (e.g. neg.../stackAlloc.scala, others)
Additionally to normal processing, update types of closures if the expected type is a function with only pure parameters. In that case, make the anonymous function also have the same parameters as the prototype. TODO: Develop a clearer rationale for this. TODO: Can we generalize this to arbitrary parameters? Currently some tests fail if we do this. (e.g. neg.../stackAlloc.scala, others)
Attributes
- Definition Classes
Class-specific capture set relations:
Class-specific capture set relations:
- The capture set of a class includes the capture sets of its parents.
- The capture set of the self type of a class includes the capture set of the class.
- The capture set of the self type of a class includes the capture set of every class parameter, unless the parameter is marked @constructorOnly.
- If the class extends a pure base class, the capture set of the self type must be empty.
Attributes
- Definition Classes
Attributes
- Definition Classes
Attributes
- Definition Classes
If tree is a reference or an application where the result type refers to an enclosing class or method parameter of the reference, check that the result type does not capture the universal capability. This is justified since the result type would have to be implicitly unboxed. TODO: Can we find a cleaner way to achieve this? Logically, this should be part of simulated boxing and unboxing.
If tree is a reference or an application where the result type refers to an enclosing class or method parameter of the reference, check that the result type does not capture the universal capability. This is justified since the result type would have to be implicitly unboxed. TODO: Can we find a cleaner way to achieve this? Logically, this should be part of simulated boxing and unboxing.
Attributes
- Definition Classes
Attributes
- Definition Classes
A specialized implementation of the selection rule.
A specialized implementation of the selection rule.
E |- f: f{ m: Cr R }^Cf
E |- f.m: R^C
The implementation picks as C one of {f} or Cr, depending on the outcome of a mightSubcapture test. It picks {f} if this might subcapture Cr and Cr otherwise.
Attributes
- Definition Classes
Attributes
- Definition Classes
If type is of the form T @requiresCapability(x), mark x as free in the current environment. This is used to require the correct CanThrow capability when encountering a throw.
If type is of the form T @requiresCapability(x), mark x as free in the current environment. This is used to require the correct CanThrow capability when encountering a throw.
Attributes
- Definition Classes
Inherited methods
Check that widened types of tpe and pt are compatible.
When we select the apply of a function with type such as (=> A) => B, we need to convert the parameter type => A to () ?=> A. See doc comment of mapExprType.
When we select the apply of a function with type such as (=> A) => B, we need to convert the parameter type => A to () ?=> A. See doc comment of mapExprType.
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Recheck tree without adapting it, returning its new type.
Recheck tree without adapting it, returning its new type.
Value parameters
- pt
-
the expected result type
- tree
-
the original tree
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Attributes
- Inherited from:
- Rechecker
Reset all references in prevSelDenots to the denotations they had before this phase.
Reset all references in prevSelDenots to the denotations they had before this phase.
Attributes
- Inherited from:
- Rechecker
Typing and previous transforms sometimes leaves skolem types in prefixes of NamedTypes in expected that do not match the actual Type. -Ycheck does not complain (need to find out why), but a full recheck does. We compensate by de-skolemizing everywhere in expected except when variance is negative.
Typing and previous transforms sometimes leaves skolem types in prefixes of NamedTypes in expected that do not match the actual Type. -Ycheck does not complain (need to find out why), but a full recheck does. We compensate by de-skolemizing everywhere in expected except when variance is negative.
Attributes
- Returns
-
If
tpcontains SkolemTypes in covariant or invariant positions, the type where these SkolemTypes are mapped to their underlying type. Otherwise,tpitself - Inherited from:
- Rechecker