end
#print "4.is {sub} a {sup}? <- no more resolution"
- if sub isa MBottomType then
+ if sub isa MBottomType or sub isa MErrorType then
return true
end
assert sub isa MClassType else print_error "{sub} <? {sup}" # It is the only remaining type
# Handle sup-type when the sub-type is class-based (other cases must have be identified before).
- if sup isa MFormalType or sup isa MNullType or sup isa MBottomType then
+ if sup isa MFormalType or sup isa MNullType or sup isa MBottomType or sup isa MErrorType then
# These types are not super-types of Class-based types.
return false
end
# The result is returned exactly as declared in the "type" property (verbatim).
# So it could be another formal type.
#
- # In case of conflicts or inconsistencies in the model, the method returns a `MBottomType`.
+ # In case of conflicts or inconsistencies in the model, the method returns a `MErrorType`.
fun lookup_bound(mmodule: MModule, resolved_receiver: MType): MType do return self
# Resolve the formal type to its simplest equivalent form.
# By default, return self.
# See the redefinitions for specific behavior in each kind of type.
#
- # In case of conflicts or inconsistencies in the model, the method returns a `MBottomType`.
+ # In case of conflicts or inconsistencies in the model, the method returns a `MErrorType`.
fun lookup_fixed(mmodule: MModule, resolved_receiver: MType): MType do return self
# Can the type be resolved?
redef fun lookup_bound(mmodule: MModule, resolved_receiver: MType): MType
do
- return lookup_single_definition(mmodule, resolved_receiver).bound or else new MBottomType(model)
+ return lookup_single_definition(mmodule, resolved_receiver).bound or else new MErrorType(model)
end
private fun lookup_single_definition(mmodule: MModule, resolved_receiver: MType): MVirtualTypeDef
var prop = lookup_single_definition(mmodule, resolved_receiver)
var res = prop.bound
- if res == null then return new MBottomType(model)
+ if res == null then return new MErrorType(model)
# Recursively lookup the fixed result
res = res.lookup_fixed(mmodule, resolved_receiver)
do
if not cleanup_virtual then return self
assert can_resolve_for(mtype, anchor, mmodule)
+
+ if mproperty.is_selftype then return mtype
+
# self is a virtual type declared (or inherited) in mtype
# The point of the function it to get the bound of the virtual type that make sense for mtype
# But because mtype is maybe a virtual/formal type, we need to get a real receiver first
# The special universal most specific type.
#
# This type is intended to be only used internally for type computation or analysis and should not be exposed to the user.
-# The bottom type can de used to denote things that are absurd, dead, or the absence of knowledge.
+# The bottom type can de used to denote things that are dead (no instance).
#
# Semantically it is the singleton `null.as_notnull`.
+# Is also means that `self.as_nullable == null`.
class MBottomType
super MType
redef var model
redef fun collect_mtypes(mmodule) do return new HashSet[MClassType]
end
+# A special type used as a silent error marker when building types.
+#
+# This type is intended to be only used internally for type operation and should not be exposed to the user.
+# The error type can de used to denote things that are conflicting or inconsistent.
+#
+# Some methods on types can return a `MErrorType` to denote a broken or a conflicting result.
+class MErrorType
+ super MType
+ redef var model
+ redef fun to_s do return "error"
+ redef fun full_name do return "error"
+ redef fun c_name do return "error"
+ redef fun need_anchor do return false
+ redef fun resolve_for(mtype, anchor, mmodule, cleanup_virtual) do return self
+ redef fun can_resolve_for(mtype, anchor, mmodule) do return true
+
+ redef fun collect_mclassdefs(mmodule) do return new HashSet[MClassDef]
+
+ redef fun collect_mclasses(mmodule) do return new HashSet[MClass]
+
+ redef fun collect_mtypes(mmodule) do return new HashSet[MClassType]
+end
+
# A signature of a method
class MSignature
super MType
#print "select prop {mproperty} for {mtype} in {self}"
# First, select all candidates
var candidates = new Array[MPROPDEF]
- for mpropdef in self.mpropdefs do
- # If the definition is not imported by the module, then skip
- if not mmodule.in_importation <= mpropdef.mclassdef.mmodule then continue
- # If the definition is not inherited by the type, then skip
- if not mtype.is_subtype(mmodule, null, mpropdef.mclassdef.bound_mtype) then continue
- # Else, we keep it
- candidates.add(mpropdef)
+
+ # Here we have two strategies: iterate propdefs or iterate classdefs.
+ var mpropdefs = self.mpropdefs
+ if mpropdefs.length <= 1 or mpropdefs.length < mtype.collect_mclassdefs(mmodule).length then
+ # Iterate on all definitions of `self`, keep only those inherited by `mtype` in `mmodule`
+ for mpropdef in mpropdefs do
+ # If the definition is not imported by the module, then skip
+ if not mmodule.in_importation <= mpropdef.mclassdef.mmodule then continue
+ # If the definition is not inherited by the type, then skip
+ if not mtype.is_subtype(mmodule, null, mpropdef.mclassdef.bound_mtype) then continue
+ # Else, we keep it
+ candidates.add(mpropdef)
+ end
+ else
+ # Iterate on all super-classdefs of `mtype`, keep only the definitions of `self`, if any.
+ for mclassdef in mtype.collect_mclassdefs(mmodule) do
+ var p = mclassdef.mpropdefs_by_property.get_or_null(self)
+ if p != null then candidates.add p
+ end
end
+
# Fast track for only one candidate
if candidates.length <= 1 then
self.lookup_definitions_cache[mmodule, mtype] = candidates
# The formal type associated to the virtual type property
var mvirtualtype = new MVirtualType(self)
+
+ # Is `self` the special virtual type `SELF`?
+ var is_selftype: Bool is lazy do return name == "SELF"
end
# A definition of a property (local property)
nitlanguage / nit.git / blobdiff