import modelize
import local_var_init
+import literal
redef class ToolContext
var typing_phase: Phase = new TypingPhase(self, [flow_phase, modelize_property_phase, local_var_init_phase])
end
- fun visit_expr_cast(node: ANode, nexpr: AExpr, ntype: AType): nullable MType
+ fun check_expr_cast(node: ANode, nexpr: AExpr, ntype: AType): nullable MType
do
- var sub = visit_expr(nexpr)
+ var sub = nexpr.mtype
if sub == null then return null # Forward error
- var sup = self.resolve_mtype(ntype)
+ var sup = ntype.mtype
if sup == null then return null # Forward error
if sup == sub then
# Else return true.
fun check_can_be_null(anode: ANode, mtype: MType): Bool
do
+ if mtype isa MNullType then
+ modelbuilder.warning(anode, "useless-null-test", "Warning: expression is always `null`.")
+ return true
+ end
if can_be_null(mtype) then return true
if mtype isa MFormalType then
if not mtype2 isa MNullType then return
# Check of useless null
- if not check_can_be_null(anode.n_expr, mtype) then return
+ if not can_be_null(mtype) then return
if mtype isa MNullType then
# Because of type adaptation, we cannot just stop here
#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
redef class AMethPropdef
redef fun do_typing(modelbuilder: ModelBuilder)
do
- var nblock = self.n_block
- if nblock == null then return
-
var mpropdef = self.mpropdef
if mpropdef == null then return # skip error
variable.declared_type = mtype
end
+ var nblock = self.n_block
+ if nblock == null then return
+
loop
v.dirty = false
v.visit_stmt(nblock)
if not v.has_loop or not v.dirty then break
end
+ var post_visitor = new PostTypingVisitor(v)
+ post_visitor.enter_visit(self)
+
if not nblock.after_flow_context.is_unreachable and msignature.return_mtype != null then
# We reach the end of the function without having a return, it is bad
v.error(self, "Error: reached end of function; expected `return` with a value.")
end
end
+private class PostTypingVisitor
+ super Visitor
+ var type_visitor: TypeVisitor
+ redef fun visit(n) do
+ n.visit_all(self)
+ n.accept_post_typing(type_visitor)
+ end
+end
+
+redef class ANode
+ private fun accept_post_typing(v: TypeVisitor) do end
+end
+
redef class AAttrPropdef
redef fun do_typing(modelbuilder: ModelBuilder)
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
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
if t1 isa MNullType then
- v.error(n_expr, "Type Error: `or else` on `null`.")
- else if v.check_can_be_null(n_expr, t1) then
+ self.mtype = t2
+ return
+ else if v.can_be_null(t1) then
t1 = t1.as_notnull
end
end
self.mtype = t
end
+
+ redef fun accept_post_typing(v)
+ do
+ var t1 = n_expr.mtype
+ if t1 == null then
+ return
+ else
+ v.check_can_be_null(n_expr, t1)
+ end
+ end
end
redef class ATrueExpr
end
end
-redef class AIntExpr
+redef class AIntegerExpr
redef fun accept_typing(v)
do
- var mclass = v.get_mclass(self, "Int")
+ var mclass: nullable MClass = null
+ if value isa Byte then
+ mclass = v.get_mclass(self, "Byte")
+ else if value isa Int then
+ mclass = v.get_mclass(self, "Int")
+ end
if mclass == null then return # Forward error
self.mtype = mclass.mclass_type
end
var cast_type: nullable MType
redef fun accept_typing(v)
do
- var mtype = v.visit_expr_cast(self, self.n_expr, self.n_type)
+ v.visit_expr(n_expr)
+
+ var mtype = v.resolve_mtype(n_type)
+
self.cast_type = mtype
var variable = self.n_expr.its_variable
self.mtype = v.type_bool(self)
end
+
+ redef fun accept_post_typing(v)
+ do
+ v.check_expr_cast(self, self.n_expr, self.n_type)
+ end
end
redef class AAsCastExpr
redef fun accept_typing(v)
do
- self.mtype = v.visit_expr_cast(self, self.n_expr, self.n_type)
+ v.visit_expr(n_expr)
+
+ self.mtype = v.resolve_mtype(n_type)
+ end
+
+ redef fun accept_post_typing(v)
+ do
+ v.check_expr_cast(self, self.n_expr, self.n_type)
end
end
return
end
- if v.check_can_be_null(n_expr, mtype) then
+ if v.can_be_null(mtype) then
mtype = mtype.as_notnull
end
self.mtype = mtype
end
+
+ redef fun accept_post_typing(v)
+ do
+ var mtype = n_expr.mtype
+ if mtype == null then return
+ v.check_can_be_null(n_expr, mtype)
+ end
end
redef class AParExpr
redef fun property_name do return operator
redef fun property_node do return n_op
end
-redef class AEqExpr
+
+redef class AEqFormExpr
redef fun accept_typing(v)
do
super
v.null_test(self)
end
-end
-redef class ANeExpr
- redef fun accept_typing(v)
+
+ redef fun accept_post_typing(v)
do
- super
- v.null_test(self)
+ var mtype = n_expr.mtype
+ var mtype2 = n_expr2.mtype
+
+ if mtype == null or mtype2 == null then return
+
+ if not mtype2 isa MNullType then return
+
+ v.check_can_be_null(n_expr, mtype)
end
end
redef class ACallExpr
- redef fun property_name do return n_id.text
- redef fun property_node do return n_id
+ redef fun property_name do return n_qid.n_id.text
+ redef fun property_node do return n_qid
redef fun compute_raw_arguments do return n_args.to_a
end
redef class ACallAssignExpr
- redef fun property_name do return n_id.text + "="
- redef fun property_node do return n_id
+ redef fun property_name do return n_qid.n_id.text + "="
+ redef fun property_node do return n_qid
redef fun compute_raw_arguments
do
var res = n_args.to_a
end
redef class ACallReassignExpr
- redef fun property_name do return n_id.text
- redef fun property_node do return n_id
+ redef fun property_name do return n_qid.n_id.text
+ redef fun property_node do return n_qid.n_id
redef fun compute_raw_arguments do return n_args.to_a
end
var kind = recvtype.mclass.kind
var name: String
- var nid = self.n_id
+ var nqid = self.n_qid
var node: ANode
- if nid != null then
- name = nid.text
- node = nid
+ if nqid != null then
+ name = nqid.n_id.text
+ node = nqid
else
name = "new"
node = self.n_kwnew
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