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])
# 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
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
end
end
- var callsite = new CallSite(node, recvtype, mmodule, anchor, recv_is_self, mproperty, mpropdef, msignature, erasure_cast)
+ var callsite = new CallSite(node.hot_location, recvtype, mmodule, anchor, recv_is_self, mproperty, mpropdef, msignature, erasure_cast)
return callsite
end
# Visit the expressions of args and check their conformity with the corresponding type in signature
# The point of this method is to handle varargs correctly
# Note: The signature must be correctly adapted
- fun check_signature(node: ANode, args: Array[AExpr], mproperty: MProperty, msignature: MSignature): Bool
+ fun check_signature(node: ANode, args: Array[AExpr], mproperty: MProperty, msignature: MSignature): nullable SignatureMap
do
var vararg_rank = msignature.vararg_rank
if vararg_rank >= 0 then
if args.length < msignature.arity then
modelbuilder.error(node, "Error: expected at least {msignature.arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
- return false
+ 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 false
+ # Too much argument
+ 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
+ end
+ # Other cases are managed later
end
+
#debug("CALL {unsafe_type}.{msignature}")
+ # Associate each parameter to a position in the arguments
+ var map = new SignatureMap
+
+ # Special case for the isolated last argument
+ # TODO: reify this method characteristics (where? the param, the signature, the method?)
+ var last_is_padded = mproperty.name.chars.last == '='
+ var nbargs = args.length
+ if last_is_padded then
+ nbargs -= 1
+ assert not args.last isa ANamedargExpr
+ map.map[msignature.arity - 1] = args.length - 1
+ self.visit_expr_subtype(args.last, msignature.mparameters.last.mtype)
+ end
+
+ # 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
+ 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
+ e.mtype = self.visit_expr_subtype(e.n_expr, param.mtype)
+ end
+
+ # Number of minimum mandatory remaining parameters
+ var min_arity = 0
+
+ # Second, associate remaining parameters
var vararg_decl = args.length - msignature.arity
+ var j = 0
for i in [0..msignature.arity[ do
- var j = i
- if i == vararg_rank then continue # skip the vararg
- if i > vararg_rank then
- j = i + vararg_decl
+ # Skip parameters associated by name
+ if map.map.has_key(i) then continue
+
+ var param = msignature.mparameters[i]
+
+ # Search the next free argument: skip named arguments since they are already associated
+ while j < nbargs and args[j] isa ANamedargExpr do j += 1
+ if j >= nbargs then
+ if not param.mtype isa MNullableType then
+ min_arity = j + 1
+ end
+ j += 1
+ continue
end
- var paramtype = msignature.mparameters[i].mtype
- self.visit_expr_subtype(args[j], paramtype)
+ var arg = args[j]
+ map.map[i] = j
+ j += 1
+
+ if i == vararg_rank then
+ j += vararg_decl
+ continue # skip the vararg
+ end
+
+ var paramtype = param.mtype
+ self.visit_expr_subtype(arg, paramtype)
end
+
+ if min_arity > 0 then
+ if last_is_padded then min_arity += 1
+ if min_arity < msignature.arity then
+ modelbuilder.error(node, "Error: expected at least {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ else
+ modelbuilder.error(node, "Error: expected {min_arity} argument(s) for `{mproperty}{msignature}`; got {args.length}. See introduction at `{mproperty.full_name}`.")
+ end
+ return null
+ 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 false # Forward error
+ 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
- for j in [vararg_rank..vararg_rank+vararg_decl] do
- self.visit_expr_subtype(args[j], paramtype)
+ map.vararg_decl = vararg_decl + 1
+ for i in [vararg_rank..vararg_rank+vararg_decl] do
+ self.visit_expr_subtype(args[i], paramtype)
end
end
end
- return true
+
+ return map
end
fun error(node: ANode, message: String)
end
end
+# Mapping between parameters and arguments in a call.
+#
+# Parameters and arguments are not stored in the class but referenced by their position (starting from 0)
+#
+# The point of this class is to help engine and other things to map arguments in the AST to parameters of the model.
+class SignatureMap
+ # Associate a parameter to an argument
+ var map = new ArrayMap[Int, Int]
+
+ # The length of the vararg sequence
+ # 0 if no vararg or if reverse vararg (cf `AVarargExpr`)
+ var vararg_decl: Int = 0
+end
+
# A specific method call site with its associated informations.
class CallSite
- # The associated node for location
- var node: ANode
+ # The associated location of the callsite
+ var location: Location
# The static type of the receiver (possibly unresolved)
var recv: MType
# Is a implicit cast required on erasure typing policy?
var erasure_cast: Bool
- private fun check_signature(v: TypeVisitor, args: Array[AExpr]): Bool
+ # The mapping used on the call to associate arguments to parameters
+ # If null then no specific association is required.
+ var signaturemap: nullable SignatureMap = null
+
+ private fun check_signature(v: TypeVisitor, node: ANode, args: Array[AExpr]): Bool
do
- return v.check_signature(self.node, args, self.mproperty, self.msignature)
+ var map = v.check_signature(node, args, self.mproperty, self.msignature)
+ signaturemap = map
+ return map == null
end
end
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`
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
# Return the static type of the value to store.
private fun resolve_reassignment(v: TypeVisitor, readtype, writetype: MType): nullable MType
do
- var reassign_name: String
- if self.n_assign_op isa APlusAssignOp then
- reassign_name = "+"
- else if self.n_assign_op isa AMinusAssignOp then
- reassign_name = "-"
- else
- abort
- end
+ var reassign_name = self.n_assign_op.operator
self.read_type = readtype
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
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")
+ else if value isa Int8 then
+ mclass = v.get_mclass(self, "Int8")
+ else if value isa Int16 then
+ mclass = v.get_mclass(self, "Int16")
+ else if value isa UInt16 then
+ mclass = v.get_mclass(self, "UInt16")
+ else if value isa Int32 then
+ mclass = v.get_mclass(self, "Int32")
+ else if value isa UInt32 then
+ mclass = v.get_mclass(self, "UInt32")
+ end
if mclass == null then return # Forward error
self.mtype = mclass.mclass_type
end
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)
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
var args = compute_raw_arguments
- callsite.check_signature(v, args)
+ callsite.check_signature(v, node, args)
if callsite.mproperty.is_init then
var vmpropdef = v.mpropdef
redef class ABinopExpr
redef fun compute_raw_arguments do return [n_expr2]
+ redef fun property_name do return operator
+ redef fun property_node do return n_op
end
-redef class AEqExpr
- redef fun property_name do return "=="
+
+redef class AEqFormExpr
redef fun accept_typing(v)
do
super
v.null_test(self)
end
-end
-redef class ANeExpr
- redef fun property_name do return "!="
- 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 ALtExpr
- redef fun property_name do return "<"
-end
-redef class ALeExpr
- redef fun property_name do return "<="
-end
-redef class ALlExpr
- redef fun property_name do return "<<"
-end
-redef class AGtExpr
- redef fun property_name do return ">"
-end
-redef class AGeExpr
- redef fun property_name do return ">="
-end
-redef class AGgExpr
- redef fun property_name do return ">>"
-end
-redef class APlusExpr
- redef fun property_name do return "+"
-end
-redef class AMinusExpr
- redef fun property_name do return "-"
-end
-redef class AStarshipExpr
- redef fun property_name do return "<=>"
-end
-redef class AStarExpr
- redef fun property_name do return "*"
-end
-redef class AStarstarExpr
- redef fun property_name do return "**"
-end
-redef class ASlashExpr
- redef fun property_name do return "/"
-end
-redef class APercentExpr
- redef fun property_name do return "%"
-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
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
var args = compute_raw_arguments
- callsite.check_signature(v, args)
+ callsite.check_signature(v, node, args)
var readtype = callsite.msignature.return_mtype
if readtype == null then
args = args.to_a # duplicate so raw_arguments keeps only the getter args
args.add(self.n_value)
- wcallsite.check_signature(v, args)
+ wcallsite.check_signature(v, node, args)
self.is_typed = true
end
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
msignature = v.resolve_for(msignature, recvtype, true).as(MSignature)
var args = self.n_args.to_a
if args.length > 0 then
- v.check_signature(self, args, mproperty, msignature)
+ signaturemap = v.check_signature(self, args, mproperty, msignature)
end
self.mtype = msignature.return_mtype
self.is_typed = true
mpropdef = v.mpropdef.as(MMethodDef)
end
+ # The mapping used on the call to associate arguments to parameters.
+ # If null then no specific association is required.
+ var signaturemap: nullable SignatureMap
+
private fun process_superinit(v: TypeVisitor)
do
var anchor = v.anchor
var msignature = superprop.new_msignature or else superprop.msignature.as(not null)
msignature = v.resolve_for(msignature, recvtype, true).as(MSignature)
- var callsite = new CallSite(self, recvtype, v.mmodule, v.anchor, true, superprop.mproperty, superprop, msignature, false)
+ var callsite = new CallSite(hot_location, recvtype, v.mmodule, v.anchor, true, superprop.mproperty, superprop, msignature, false)
self.callsite = callsite
var args = self.n_args.to_a
if args.length > 0 then
- callsite.check_signature(v, args)
+ callsite.check_signature(v, self, args)
else
# Check there is at least enough parameters
if mpropdef.msignature.arity < msignature.arity then
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
end
var args = n_args.to_a
- callsite.check_signature(v, args)
+ callsite.check_signature(v, node, args)
end
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