# If `sub` is a safe subtype of `sup` then return `sub`.
# If `sub` is an unsafe subtype (ie an implicit cast is required), then return `sup`.
#
- # The point of the return type is to determinate the usable type on an expression:
+ # The point of the return type is to determinate the usable type on an expression when `autocast` is true:
# 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
+ fun check_subtype(node: ANode, sub, sup: MType, autocast: Bool): nullable MType
do
if self.is_subtype(sub, sup) then return sub
- if self.is_subtype(sub, self.anchor_to(sup)) then
+ if autocast and self.is_subtype(sub, self.anchor_to(sup)) then
# FIXME workaround to the current unsafe typing policy. To remove once fixed virtual types exists.
#node.debug("Unsafe typing: expected {sup}, got {sub}")
return sup
if sup == null then return null # Forward error
- var res = check_subtype(nexpr, sub, sup)
+ var res = check_subtype(nexpr, sub, sup, true)
if res != sub then
nexpr.implicit_cast_to = res
end
#debug("recv: {recvtype} (aka {unsafe_type})")
if recvtype isa MNullType then
- # `null` only accepts some methods of object.
- if name == "==" or name == "!=" or name == "is_same_instance" then
- var objclass = get_mclass(node, "Object")
- if objclass == null then return null # Forward error
- unsafe_type = objclass.mclass_type
- else
- self.error(node, "Error: method `{name}` called on `null`.")
- return null
- end
+ var objclass = get_mclass(node, "Object")
+ if objclass == null then return null # Forward error
+ unsafe_type = objclass.mclass_type
end
var mproperty = self.try_get_mproperty_by_name2(node, unsafe_type, name)
assert mproperty isa MMethod
+ # `null` only accepts some methods of object.
+ if recvtype isa MNullType and not mproperty.is_null_safe then
+ self.error(node, "Error: method `{name}` called on `null`.")
+ return null
+ else if unsafe_type isa MNullableType and not mproperty.is_null_safe then
+ modelbuilder.advice(node, "call-on-nullable", "Warning: method call on a nullable receiver `{recvtype}`.")
+ end
+
if is_toplevel_context and recv_is_self and not mproperty.is_toplevel then
error(node, "Error: `{name}` is not a top-level method, thus need a receiver.")
end
return null
end
else if args.length != msignature.arity then
- modelbuilder.error(node, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
- return null
+ if msignature.arity == msignature.min_arity then
+ modelbuilder.error(node, "Error: expected {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
+ if args.length > msignature.arity then
+ modelbuilder.error(node, "Error: expected at most {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
+ if args.length < msignature.min_arity then
+ modelbuilder.error(node, "Error: expected at least {msignature.min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ return null
+ end
end
#debug("CALL {unsafe_type}.{msignature}")
# Associate each parameter to a position in the arguments
var map = new SignatureMap
+ var setted = args.length - msignature.min_arity
+
+ # First, handle named arguments
+ for i in [0..args.length[ do
+ var e = args[i]
+ if not e isa ANamedargExpr then continue
+ var name = e.n_id.text
+ var param = msignature.mparameter_by_name(name)
+ if param == null then
+ modelbuilder.error(e.n_id, "Error: no parameter `{name}` for `{mproperty}{msignature}`.")
+ return null
+ end
+ if not param.is_default then
+ modelbuilder.error(e, "Error: parameter `{name}` is not optional for `{mproperty}{msignature}`.")
+ return null
+ end
+ var idx = msignature.mparameters.index_of(param)
+ var prev = map.map.get_or_null(idx)
+ if prev != null then
+ modelbuilder.error(e, "Error: parameter `{name}` already associated with argument #{prev} for `{mproperty}{msignature}`.")
+ return null
+ end
+ map.map[idx] = i
+ setted -= 1
+ e.mtype = self.visit_expr_subtype(e.n_expr, param.mtype)
+ end
+
+ # Second, associate remaining parameters
var vararg_decl = args.length - msignature.arity
var j = 0
for i in [0..msignature.arity[ do
+ # Skip parameters associated by name
+ if map.map.has_key(i) then continue
+
var param = msignature.mparameters[i]
+ if param.is_default then
+ if setted > 0 then
+ setted -= 1
+ else
+ continue
+ end
+ end
+
+ # Search the next free argument: skip named arguments since they are already associated
+ while args[j] isa ANamedargExpr do j += 1
var arg = args[j]
map.map[i] = j
j += 1
var paramtype = param.mtype
self.visit_expr_subtype(arg, paramtype)
end
+
+ # Third, check varargs
if vararg_rank >= 0 then
var paramtype = msignature.mparameters[vararg_rank].mtype
var first = args[vararg_rank]
- if vararg_decl == 0 and first isa AVarargExpr then
+ if vararg_decl == 0 then
var mclass = get_mclass(node, "Array")
if mclass == null then return null # Forward error
var array_mtype = mclass.get_mtype([paramtype])
- self.visit_expr_subtype(first.n_expr, array_mtype)
- first.mtype = first.n_expr.mtype
+ if first isa AVarargExpr then
+ self.visit_expr_subtype(first.n_expr, array_mtype)
+ first.mtype = first.n_expr.mtype
+ else
+ # only one vararg, maybe `...` was forgot, so be gentle!
+ var t = visit_expr(first)
+ if t == null then return null # Forward error
+ if not is_subtype(t, paramtype) and is_subtype(t, array_mtype) then
+ # Not acceptable but could be a `...`
+ error(first, "Type Error: expected `{paramtype}`, got `{t}`. Is an ellipsis `...` missing on the argument?")
+ return null
+ end
+ # Standard valid vararg, finish the job
+ map.vararg_decl = 1
+ self.visit_expr_subtype(first, paramtype)
+ end
else
map.vararg_decl = vararg_decl + 1
for i in [vararg_rank..vararg_rank+vararg_decl] do
redef class Variable
# The declared type of the variable
- var declared_type: nullable MType
+ var declared_type: nullable MType is writable
# Was the variable type-adapted?
# This is used to speedup type retrieval while it remains `false`
do
if not has_value then return
- var mpropdef = self.mpropdef
- if mpropdef == null then return # skip error
+ var mpropdef = self.mreadpropdef
+ if mpropdef == null or mpropdef.msignature == null then return # skip error
var v = new TypeVisitor(modelbuilder, mpropdef.mclassdef.mmodule, mpropdef)
self.selfvariable = v.selfvariable
var nexpr = self.n_expr
if nexpr != null then
- var mtype = self.mpropdef.static_mtype
+ var mtype = self.mtype
v.visit_expr_subtype(nexpr, mtype)
end
var nblock = self.n_block
var value_type = v.visit_expr_subtype(self.n_value, msignature.mparameters.first.mtype)
if value_type == null then return null # Skip error
- v.check_subtype(self, rettype, writetype)
+ v.check_subtype(self, rettype, writetype, false)
return rettype
end
end
v.set_variable(self, variable, rettype)
- self.is_typed = true
+ self.is_typed = rettype != null
end
end
else
v.visit_expr(nexpr)
v.error(nexpr, "Error: `return` with value in a procedure.")
+ return
end
else if ret_type != null then
v.error(self, "Error: `return` without value in a function.")
+ return
end
self.is_typed = true
end
end
end
+redef class AByteExpr
+ redef fun accept_typing(v)
+ do
+ var mclass = v.get_mclass(self, "Byte")
+ if mclass == null then return # Forward error
+ self.mtype = mclass.mclass_type
+ end
+end
+
redef class AFloatExpr
redef fun accept_typing(v)
do
end
set_comprehension(e)
if mtype != null then
- if v.check_subtype(e, t, mtype) == null then return # Skip error
+ if v.check_subtype(e, t, mtype, false) == null then return # Forward error
if t == mtype then useless = true
else
mtypes.add(t)
end
end
-redef class AUplusExpr
- redef fun property_name do return "unary +"
- redef fun compute_raw_arguments do return new Array[AExpr]
-end
-
-redef class AUminusExpr
- redef fun property_name do return "unary -"
+redef class AUnaryopExpr
+ redef fun property_name do return "unary {operator}"
redef fun compute_raw_arguments do return new Array[AExpr]
end
var mtype = self.attr_type
v.visit_expr_subtype(self.n_value, mtype)
- self.is_typed = true
+ self.is_typed = mtype != null
end
end
var mtype = self.attr_type
if mtype == null then return # Skip error
- self.resolve_reassignment(v, mtype, mtype)
+ var rettype = self.resolve_reassignment(v, mtype, mtype)
- self.is_typed = true
+ self.is_typed = rettype != null
end
end
nitlanguage / nit.git / blobdiff