module typing
import flow
-import modelbuilder
+import modelize_property
+import phase
+import local_var_init
+
+redef class ToolContext
+ var typing_phase: Phase = new TypingPhase(self, [flow_phase, modelize_property_phase, local_var_init_phase])
+end
+
+private class TypingPhase
+ super Phase
+ redef fun process_npropdef(npropdef) do npropdef.do_typing(toolcontext.modelbuilder)
+end
private class TypeVisitor
var modelbuilder: ModelBuilder
return res
end
- fun resolve_signature_for(msignature: MSignature, recv: MType, for_self: Bool): MSignature
+ # Retrieve the signature of a MMethodDef resolved for a specific call.
+ # This method is an helper to symplify the query on the model.
+ #
+ # Note: `for_self` indicates if the reciever is self or not.
+ # If yes, virtual types are not resolved.
+ fun resolve_signature_for(mmethoddef: MMethodDef, recv: MType, for_self: Bool): MSignature
do
- return self.resolve_for(msignature, recv, for_self).as(MSignature)
+ return self.resolve_for(mmethoddef.msignature.as(not null), recv, for_self).as(MSignature)
end
- fun check_subtype(node: ANode, sub, sup: MType): Bool
+ # Check that `sub` is a subtype of `sup`.
+ # If `sub` is not a valud suptype, then display an error on `node` an return null.
+ # If `sub` is a safe subtype of `sup` then return `sub`.
+ # If `sun` is an insafe subtype (ie an imlicit cast is required), then return `sup`.
+ #
+ # The point of the return type is to determinate the usable type on an expression:
+ # If the suptype is safe, then the return type is the one on the expression typed by `sub`.
+ # Is the subtype is unsafe, then the return type is the one of an implicit cast on `sup`.
+ fun check_subtype(node: ANode, sub, sup: MType): nullable MType
do
- if self.is_subtype(sub, sup) then return true
+ if self.is_subtype(sub, sup) then return sub
if self.is_subtype(sub, self.anchor_to(sup)) then
# FIXME workarround to the current unsafe typing policy. To remove once fixed virtual types exists.
#node.debug("Unsafe typing: expected {sup}, got {sub}")
- return true
+ return sup
end
self.modelbuilder.error(node, "Type error: expected {sup}, got {sub}")
- return false
+ return null
end
# Visit an expression and do not care about the return value
if sup == null then return null # Forward error
- if not check_subtype(nexpr, sub, sup) then
- return null
+ var res = check_subtype(nexpr, sub, sup)
+ if res != sub then
+ nexpr.implicit_cast_to = res
end
- return sub
+ return res
end
# Visit an expression and expect its static type is a bool
return mclass.mclass_type
end
- fun get_method(node: ANode, recvtype: MType, name: String, recv_is_self: Bool): nullable MMethodDef
+ fun get_method(node: ANode, recvtype: MType, name: String, recv_is_self: Bool): nullable CallSite
do
var unsafe_type = self.anchor_to(recvtype)
#debug("recv: {recvtype} (aka {unsafe_type})")
+ if recvtype isa MNullType then
+ self.error(node, "Error: Method '{name}' call on 'null'.")
+ return null
+ end
var mproperty = self.try_get_mproperty_by_name2(node, unsafe_type, name)
if mproperty == null then
return null
end
+ assert mproperty isa MMethod
if mproperty.visibility == protected_visibility and not recv_is_self and self.mmodule.visibility_for(mproperty.intro_mclassdef.mmodule) < intrude_visibility then
self.modelbuilder.error(node, "Error: Method '{name}' is protected and can only acceded by self. {mproperty.intro_mclassdef.mmodule.visibility_for(self.mmodule)}")
return null
end
var propdefs = mproperty.lookup_definitions(self.mmodule, unsafe_type)
+ var mpropdef
if propdefs.length == 0 then
self.modelbuilder.error(node, "Type error: no definition found for property {name} in {unsafe_type}")
return null
- else if propdefs.length > 1 then
- self.modelbuilder.error(node, "Error: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
- return null
+ else if propdefs.length == 1 then
+ mpropdef = propdefs.first
+ else
+ self.modelbuilder.warning(node, "Warning: confliting property definitions for property {name} in {unsafe_type}: {propdefs.join(" ")}")
+ mpropdef = mproperty.intro
end
- var propdef = propdefs.first
- assert propdef isa MMethodDef
- return propdef
+
+ var msignature = self.resolve_signature_for(mpropdef, recvtype, recv_is_self)
+
+ var erasure_cast = false
+ var rettype = mpropdef.msignature.return_mtype
+ if not recv_is_self and rettype != null then
+ if rettype isa MNullableType then rettype = rettype.mtype
+ if rettype isa MParameterType then
+ var erased_rettype = msignature.return_mtype
+ assert erased_rettype != null
+ #node.debug("Erasure cast: Really a {rettype} but unsafely a {erased_rettype}")
+ erasure_cast = true
+ end
+ end
+
+ var callsite = new CallSite(node, recvtype, recv_is_self, mproperty, mpropdef, msignature, erasure_cast)
+ return callsite
end
# Visit the expressions of args and cheik their conformity with the corresponding typi in signature
end
end
+# A specific method call site with its associated informations.
+class CallSite
+ # The assiciated node for location
+ var node: ANode
+
+ # The statis type of the receiver
+ var recv: MType
+
+ # Is the receiver self?
+ # If "for_self", virtual types of the signature are keeped
+ # If "not_for_self", virtual type are erased
+ var recv_is_self: Bool
+
+ # The designated method
+ var mproperty: MMethod
+
+ # The statically designated method definition
+ # The most specif one, it is.
+ var mpropdef: MMethodDef
+
+ # The resolved signature for the receiver
+ var msignature: MSignature
+
+ # Is a implicit cast required on erasure typing policy?
+ var erasure_cast: Bool
+
+ private fun check_signature(v: TypeVisitor, args: Array[AExpr]): Bool
+ do
+ return v.check_signature(self.node, args, self.mproperty.name, self.msignature)
+ end
+end
+
redef class Variable
# The declared type of the variable
var declared_type: nullable MType
# Used to distinguish errors and statements when `mtype' == null
var is_typed: Bool = false
+ # If required, the following implicit cast ".as(XXX)"
+ # Such a cast may by required after evaluating the expression when
+ # a unsafe operation is detected (silently accepted by the Nit language).
+ # The attribute is computed by `check_subtype`
+ var implicit_cast_to: nullable MType = null
+
# Return the variable read (if any)
# Used to perform adaptive typing
fun its_variable: nullable Variable do return null
end
end
- if mtype == null then
- mtype = v.get_mclass(self, "Object").mclass_type.as_nullable
+ var decltype = mtype
+ if mtype == null or mtype isa MNullType then
+ decltype = v.get_mclass(self, "Object").mclass_type.as_nullable
+ if mtype == null then mtype = decltype
end
- variable.declared_type = mtype
+ variable.declared_type = decltype
v.set_variable(self, variable, mtype)
#debug("var {variable}: {mtype}")
end
redef class AReassignFormExpr
+ # @depreciated use `reassign_callsite`
+ fun reassign_property: nullable MMethodDef do return self.reassign_callsite.mpropdef
+
# The method designed by the reassign operator.
- var reassign_property: nullable MMethodDef = null
+ var reassign_callsite: nullable CallSite
var read_type: nullable MType = null
return null
end
- var mpropdef = v.get_method(self, readtype, reassign_name, false)
- if mpropdef == null then return null # Skip error
-
- self.reassign_property = mpropdef
-
- var msignature = mpropdef.msignature
- assert msignature!= null
- msignature = v.resolve_signature_for(msignature, readtype, false)
+ var callsite = v.get_method(self, readtype, reassign_name, false)
+ if callsite == null then return null # Skip error
+ self.reassign_callsite = callsite
+ var msignature = callsite.msignature
var rettype = msignature.return_mtype
assert msignature.arity == 1 and rettype != null
# get iterator method
var coltype = self.coltype.as(not null)
var itdef = v.get_method(self, coltype, "iterator", true)
- var itdefsign = itdef.msignature
- if itdef == null or itdefsign == null then
+ if itdef == null then
v.error(self, "Type Error: Expected method 'iterator' in type {coltype}")
return
end
self.method_iterator = itdef.mproperty
# get iterator type
- var ittype = v.resolve_signature_for(itdefsign, mtype, false).return_mtype
+ var ittype = itdef.msignature.return_mtype
if ittype == null then
v.error(self, "Type Error: Expected method 'iterator' to return an Iterator type")
return
do
var discrete_class = v.get_mclass(self, "Discrete")
if discrete_class == null then return # Forward error
- var discrete_type = discrete_class.mclassdefs.first.bound_mtype
+ var discrete_type = discrete_class.intro.bound_mtype
var t1 = v.visit_expr_subtype(self.n_expr, discrete_type)
var t2 = v.visit_expr_subtype(self.n_expr2, discrete_type)
if t1 == null or t2 == null then return
## MESSAGE SENDING AND PROPERTY
redef class ASendExpr
+ # @depreciated: use `callsite`
+ fun mproperty: nullable MMethod do return callsite.mproperty
+
# The property invoked by the send.
- var mproperty: nullable MMethod
+ var callsite: nullable CallSite
redef fun accept_typing(v)
do
return
end
- var propdef = v.get_method(self, recvtype, name, self.n_expr isa ASelfExpr)
- if propdef == null then return
- var mproperty = propdef.mproperty
- self.mproperty = mproperty
- var msignature = propdef.msignature
- if msignature == null then abort # Forward error
-
- var for_self = self.n_expr isa ASelfExpr
- msignature = v.resolve_signature_for(msignature, recvtype, for_self)
+ var callsite = v.get_method(self, recvtype, name, self.n_expr isa ASelfExpr)
+ if callsite == null then return
+ self.callsite = callsite
+ var msignature = callsite.msignature
var args = compute_raw_arguments
self.raw_arguments = args
- v.check_signature(self, args, name, msignature)
+ callsite.check_signature(v, args)
- if mproperty.is_init then
+ if callsite.mproperty.is_init then
var vmpropdef = v.mpropdef
if not (vmpropdef isa MMethodDef and vmpropdef.mproperty.is_init) then
v.error(self, "Can call a init only in another init")
end
redef class ASendReassignFormExpr
+ # @depreciated use `write_callsite`
+ fun write_mproperty: nullable MMethod do return write_callsite.mproperty
+
# The property invoked for the writing
- var write_mproperty: nullable MMethod = null
+ var write_callsite: nullable CallSite
redef fun accept_typing(v)
do
return
end
- var propdef = v.get_method(self, recvtype, name, self.n_expr isa ASelfExpr)
- if propdef == null then return
- var mproperty = propdef.mproperty
- self.mproperty = mproperty
- var msignature = propdef.msignature
- if msignature == null then abort # Forward error
var for_self = self.n_expr isa ASelfExpr
- msignature = v.resolve_signature_for(msignature, recvtype, for_self)
+ var callsite = v.get_method(self, recvtype, name, for_self)
+
+ if callsite == null then return
+ self.callsite = callsite
var args = compute_raw_arguments
self.raw_arguments = args
- v.check_signature(self, args, name, msignature)
+ callsite.check_signature(v, args)
- var readtype = msignature.return_mtype
+ var readtype = callsite.msignature.return_mtype
if readtype == null then
v.error(self, "Error: {name} is not a function")
return
end
- var wpropdef = v.get_method(self, recvtype, name + "=", self.n_expr isa ASelfExpr)
- if wpropdef == null then return
- var wmproperty = wpropdef.mproperty
- self.write_mproperty = wmproperty
- var wmsignature = wpropdef.msignature
- if wmsignature == null then abort # Forward error
- wmsignature = v.resolve_signature_for(wmsignature, recvtype, for_self)
+ var wcallsite = v.get_method(self, recvtype, name + "=", self.n_expr isa ASelfExpr)
+ if wcallsite == null then return
+ self.write_callsite = wcallsite
- var wtype = self.resolve_reassignment(v, readtype, wmsignature.mparameters.last.mtype)
+ var wtype = self.resolve_reassignment(v, readtype, wcallsite.msignature.mparameters.last.mtype)
if wtype == null then return
args = args.to_a # duplicate so raw_arguments keeps only the getter args
args.add(self.n_value)
- v.check_signature(self, args, name + "=", wmsignature)
+ wcallsite.check_signature(v, args)
self.is_typed = true
end
end
v.error(self, "Error: No super method to call for {mproperty}.")
return
- else if superprops.length > 1 then
- v.modelbuilder.warning(self, "Warning: NOT YET IMPLEMENTED: Conflicting super method to call for {mproperty}: {superprops.join(", ")}.")
- return
end
+ # FIXME: covariance of return type in linear extension?
var superprop = superprops.first
assert superprop isa MMethodDef
- var msignature = superprop.msignature.as(not null)
- msignature = v.resolve_signature_for(msignature, recvtype, true)
+ var msignature = v.resolve_signature_for(superprop, recvtype, true)
var args = self.n_args.to_a
if args.length > 0 then
v.check_signature(self, args, mproperty.name, msignature)
self.mproperty = superprop.mproperty
var args = self.n_args.to_a
- var msignature = superprop.msignature.as(not null)
- msignature = v.resolve_signature_for(msignature, recvtype, true)
+ var msignature = v.resolve_signature_for(superprop, recvtype, true)
if args.length > 0 then
v.check_signature(self, args, mproperty.name, msignature)
else
####
redef class ANewExpr
+ # @depreciated use `callsite`
+ fun mproperty: nullable MMethod do return self.callsite.mproperty
+
# The constructor invoked by the new.
- var mproperty: nullable MMethod
+ var callsite: nullable CallSite
redef fun accept_typing(v)
do
else
name = "init"
end
- var propdef = v.get_method(self, recvtype, name, false)
- if propdef == null then return
+ var callsite = v.get_method(self, recvtype, name, false)
+ if callsite == null then return
- self.mproperty = propdef.mproperty
+ self.callsite = callsite
- if not propdef.mproperty.is_init_for(recvtype.mclass) then
+ if not callsite.mproperty.is_init_for(recvtype.mclass) then
v.error(self, "Error: {name} is not a constructor.")
return
end
- var msignature = propdef.msignature.as(not null)
- msignature = v.resolve_signature_for(msignature, recvtype, false)
-
var args = n_args.to_a
- v.check_signature(self, args, name, msignature)
+ callsite.check_signature(v, args)
end
end
if variable == null then return # Skip error
var recvtype = v.nclassdef.mclassdef.bound_mtype
- var msignature = variable.declared_type.as(MSignature)
- msignature = v.resolve_signature_for(msignature, recvtype, false)
+ var msignature = variable.declared_type.as(not null)
+ msignature = v.resolve_for(msignature, recvtype, false).as(MSignature)
var args = n_args.to_a
v.check_signature(self, args, variable.name, msignature)
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