# The module of the analysis
# Used to correctly query the model
- var mmodule: MModule
+ var mmodule: MModule is noinit
# The static type of the receiver
# Mainly used for type tests and type resolutions
- var anchor: nullable MClassType = null
+ var anchor: MClassType is noinit
# The analyzed mclassdef
- var mclassdef: nullable MClassDef = null
+ var mclassdef: MClassDef is noinit
# The analyzed property
- var mpropdef: nullable MPropDef
+ var mpropdef: MPropDef
var selfvariable = new Variable("self")
init
do
var mpropdef = self.mpropdef
+ var mclassdef = mpropdef.mclassdef
+ mmodule = mclassdef.mmodule
+ self.mclassdef = mclassdef
+ self.anchor = mclassdef.bound_mtype
- if mpropdef != null then
- self.mpropdef = mpropdef
- var mclassdef = mpropdef.mclassdef
- self.mclassdef = mclassdef
- self.anchor = mclassdef.bound_mtype
-
- var mclass = mclassdef.mclass
+ var mclass = mclassdef.mclass
- var selfvariable = new Variable("self")
- self.selfvariable = selfvariable
- selfvariable.declared_type = mclass.mclass_type
+ var selfvariable = new Variable("self")
+ self.selfvariable = selfvariable
+ selfvariable.declared_type = mclass.mclass_type
- var mprop = mpropdef.mproperty
- if mprop isa MMethod and mprop.is_new then
- is_toplevel_context = true
- end
+ var mprop = mpropdef.mproperty
+ if mprop isa MMethod and mprop.is_new then
+ is_toplevel_context = true
end
end
fun anchor_to(mtype: MType): MType
do
- var anchor = anchor
- if anchor == null then
- assert not mtype.need_anchor
- return mtype
- end
return mtype.anchor_to(mmodule, anchor)
end
end
# Check that `sub` is a subtype of `sup`.
- # If `sub` is not a valid suptype, then display an error on `node` an return null.
- # 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`.
+ # If `sub` is not a valid suptype, then display an error on `node` and return `null`.
+ # If `sub` is a safe subtype of `sup`, then return `sub`.
+ # If `sub` is an unsafe subtype (i.e., an implicit cast is required), then return `sup`.
#
# 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`.
#node.debug("Unsafe typing: expected {sup}, got {sub}")
return sup
end
- if sup isa MBottomType then return null # Skip error
+ if sup isa MErrorType then return null # Skip error
if sub.need_anchor then
var u = anchor_to(sub)
self.modelbuilder.error(node, "Type Error: expected `{sup}`, got `{sub}: {u}`.")
end
return null # forward error
end
- self.error(nexpr, "Error: expected an expression.")
+ var more_message = null
+ var p = nexpr.parent
+ if p != null then more_message = p.bad_expr_message(nexpr)
+ if more_message == null then more_message = "" else more_message = " " + more_message
+ self.error(nexpr, "Error: expected an expression{more_message}.")
return null
end
fun resolve_mtype(node: AType): nullable MType
do
- return self.modelbuilder.resolve_mtype(mmodule, mclassdef, node)
+ return self.modelbuilder.resolve_mtype(mclassdef, node)
end
fun try_get_mclass(node: ANode, name: String): nullable MClass
return mtypes.first
else
var res = merge_types(node,mtypes)
- if res == null then res = variable.declared_type
+ if res == null then
+ res = variable.declared_type
+ # Try to fallback to a non-null version
+ if res != null and can_be_null(res) then do
+ for t in mtypes do
+ if t != null and can_be_null(t) then break label
+ end
+ res = res.as_notnull
+ end label
+ end
return res
end
end
flow.set_var(self, variable, mtype)
end
+ # Find the exact representable most specific common super-type in `col`.
+ #
+ # Try to find the most specific common type that is a super-type of each types
+ # in `col`.
+ # In most cases, the result is simply the most general type in `col`.
+ # If nullables types are involved, then the nullable information is correctly preserved.
+ # If incomparable super-types exists in `col`, them no solution is given and the `null`
+ # value is returned (since union types are non representable in Nit)
+ #
+ # The `null` values in `col` are ignored, nulltypes (MNullType) are considered.
+ #
+ # Returns the `null` value if:
+ #
+ # * `col` is empty
+ # * `col` only have null values
+ # * there is a conflict
+ #
+ # Example (with a diamond A,B,C,D):
+ #
+ # * merge(A,B,C) -> A, because A is the most general type in {A,B,C}
+ # * merge(C,B) -> null, there is conflict, because `B or C` cannot be represented
+ # * merge(A,nullable B) -> nullable A, because A is the most general type and
+ # the nullable information is preserved
fun merge_types(node: ANode, col: Array[nullable MType]): nullable MType
do
if col.length == 1 then return col.first
#self.modelbuilder.warning(node, "Type Error: {col.length} conflicting types: <{col.join(", ")}>")
return null
end
+
+ # Find a most general common subtype between `type1` and `type2`.
+ #
+ # Find the most general type that is a subtype of `type2` and, if possible, a subtype of `type1`.
+ # Basically, this return the most specific type between `type1` and `type2`.
+ # If nullable types are involved, the information is correctly preserved.
+ # If `type1` and `type2` are incomparable then `type2` is preferred (since intersection types
+ # are not representable in Nit).
+ #
+ # The `null` value is returned if both `type1` and `type2` are null.
+ #
+ # Examples (with diamond A,B,C,D):
+ #
+ # * intersect_types(A,B) -> B, because B is a subtype of A
+ # * intersect_types(B,A) -> B, because B is a subtype of A
+ # * intersect_types(B,C) -> C, B and C are incomparable,
+ # `type2` is then preferred (`B and C` cannot be represented)
+ # * intersect_types(nullable B,A) -> B, because B<:A and the non-null information is preserved
+ # * intersect_types(B,nullable C) -> C, `type2` is preferred and the non-null information is preserved
+ fun intersect_types(node: ANode, type1, type2: nullable MType): nullable MType
+ do
+ if type1 == null then return type2
+ if type2 == null then return type1
+
+ if not can_be_null(type2) or not can_be_null(type1) then
+ type1 = type1.as_notnull
+ type2 = type2.as_notnull
+ end
+
+ var res
+ if is_subtype(type1, type2) then
+ res = type1
+ else
+ res = type2
+ end
+ return res
+ end
+
+ # Find a most general type that is a subtype of `type1` but not one of `type2`.
+ #
+ # Basically, this returns `type1`-`type2` but since there is no substraction type
+ # in Nit this just returns `type1` most of the case.
+ #
+ # The few other cases are if `type2` is a super-type and if some nullable information
+ # is present.
+ #
+ # The `null` value is returned if `type1` is null.
+ #
+ # Examples (with diamond A,B,C,D):
+ #
+ # * diff_types(A,B) -> A, because the notB cannot be represented
+ # * diff_types(B,A) -> None (absurd type), because B<:A
+ # * diff_types(nullable A, nullable B) -> A, because null is removed
+ # * diff_types(nullable B, A) -> Null, because anything but null is removed
+ fun diff_types(node: ANode, type1, type2: nullable MType): nullable MType
+ do
+ if type1 == null then return null
+ if type2 == null then return type1
+
+ # if t1 <: t2 then t1-t2 = bottom
+ if is_subtype(type1, type2) then
+ return modelbuilder.model.null_type.as_notnull
+ end
+
+ # else if t1 <: nullable t2 then t1-t2 = nulltype
+ if is_subtype(type1, type2.as_nullable) then
+ return modelbuilder.model.null_type
+ end
+
+ # else t2 can be null and type2 must accept null then null is excluded in t1
+ if can_be_null(type1) and (type2 isa MNullableType or type2 isa MNullType) then
+ return type1.as_notnull
+ end
+
+ return type1
+ end
end
# Mapping between parameters and arguments in a call.
class CallSite
super MEntity
- # The associated location of the callsite
- var location: Location
+ redef var location
# The static type of the receiver (possibly unresolved)
var recv: MType
if map == null then is_broken = true
return map == null
end
+
+ # Information about the callsite to display on a node
+ fun dump_info(v: ASTDump): String do
+ return "{recv}.{mpropdef}{msignature}"
+ end
+
+ redef fun mdoc_or_fallback do return mproperty.intro.mdoc
end
redef class Variable
# The declared type of the variable
- var declared_type: nullable MType is writable
+ var declared_type: nullable MType = null is writable
# Was the variable type-adapted?
# This is used to speedup type retrieval while it remains `false`
var mpropdef = self.mpropdef
if mpropdef == null then return # skip error
- var v = new TypeVisitor(modelbuilder, mpropdef.mclassdef.mmodule, mpropdef)
+ var v = new TypeVisitor(modelbuilder, mpropdef)
self.selfvariable = v.selfvariable
var mmethoddef = self.mpropdef.as(not null)
redef class ANode
private fun accept_post_typing(v: TypeVisitor) do end
+
+ # An additional information message to explain the role of a child expression.
+ #
+ # The point of the method is to allow some kind of double dispatch so the parent
+ # choose how to describe its children.
+ private fun bad_expr_message(child: AExpr): nullable String do return null
end
redef class AAttrPropdef
var mpropdef = self.mreadpropdef
if mpropdef == null or mpropdef.msignature == null then return # skip error
- var v = new TypeVisitor(modelbuilder, mpropdef.mclassdef.mmodule, mpropdef)
+ var v = new TypeVisitor(modelbuilder, mpropdef)
self.selfvariable = v.selfvariable
var nexpr = self.n_expr
#
# This attribute is meaning less on expressions not used as attributes.
var vararg_decl: Int = 0
+
+ redef fun dump_info(v) do
+ var res = super
+ var mtype = self.mtype
+ if mtype != null then
+ res += v.yellow(":{mtype}")
+ end
+ var ict = self.implicit_cast_to
+ if ict != null then
+ res += v.yellow("(.as({ict}))")
+ end
+ return res
+ end
end
redef class ABlockExpr
redef fun accept_typing(v)
do
v.visit_stmt(n_block)
+ v.visit_stmt(n_catch)
self.is_typed = true
end
end
end
redef class ACharExpr
- redef fun accept_typing(v)
- do
- var mclass = v.get_mclass(self, "Char")
+ redef fun accept_typing(v) do
+ var mclass: nullable MClass = null
+ if is_ascii then
+ mclass = v.get_mclass(self, "Byte")
+ else if is_code_point then
+ mclass = v.get_mclass(self, "Int")
+ else
+ mclass = v.get_mclass(self, "Char")
+ end
if mclass == null then return # Forward error
self.mtype = mclass.mclass_type
end
end
-redef class AStringFormExpr
- redef fun accept_typing(v)
- do
+redef class AugmentedStringFormExpr
+ super AExpr
+
+ # Text::to_re, used for prefix `re`
+ var to_re: nullable CallSite = null
+ # Regex::ignore_case, used for suffix `i` on `re`
+ var ignore_case: nullable CallSite = null
+ # Regex::newline, used for suffix `m` on `re`
+ var newline: nullable CallSite = null
+ # Regex::extended, used for suffix `b` on `re`
+ var extended: nullable CallSite = null
+ # CString::to_bytes_with_copy, used for prefix `b`
+ var to_bytes_with_copy: nullable CallSite = null
+
+ redef fun accept_typing(v) do
var mclass = v.get_mclass(self, "String")
if mclass == null then return # Forward error
- self.mtype = mclass.mclass_type
+ if is_bytestring then
+ to_bytes_with_copy = v.get_method(self, v.mmodule.c_string_type, "to_bytes_with_copy", false)
+ mclass = v.get_mclass(self, "Bytes")
+ else if is_re then
+ to_re = v.get_method(self, mclass.mclass_type, "to_re", false)
+ for i in suffix.chars do
+ mclass = v.get_mclass(self, "Regex")
+ if mclass == null then
+ v.error(self, "Error: `Regex` class unknown")
+ return
+ end
+ var service = ""
+ if i == 'i' then
+ service = "ignore_case="
+ ignore_case = v.get_method(self, mclass.mclass_type, service, false)
+ else if i == 'm' then
+ service = "newline="
+ newline = v.get_method(self, mclass.mclass_type, service, false)
+ else if i == 'b' then
+ service = "extended="
+ extended = v.get_method(self, mclass.mclass_type, service, false)
+ else
+ v.error(self, "Type Error: Unrecognized suffix {i} in prefixed Regex")
+ abort
+ end
+ end
+ end
+ if mclass == null then return # Forward error
+ mtype = mclass.mclass_type
end
end
redef class ASuperstringExpr
redef fun accept_typing(v)
do
- var mclass = v.get_mclass(self, "String")
- if mclass == null then return # Forward error
- self.mtype = mclass.mclass_type
+ super
var objclass = v.get_mclass(self, "Object")
if objclass == null then return # Forward error
var objtype = objclass.mclass_type
var variable = self.n_expr.its_variable
if variable != null then
- #var orig = self.n_expr.mtype
+ var orig = self.n_expr.mtype
#var from = if orig != null then orig.to_s else "invalid"
#var to = if mtype != null then mtype.to_s else "invalid"
#debug("adapt {variable}: {from} -> {to}")
- self.after_flow_context.when_true.set_var(v, variable, mtype)
+
+ var thentype = v.intersect_types(self, orig, mtype)
+ if thentype != orig then
+ self.after_flow_context.when_true.set_var(v, variable, thentype)
+ #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> then {thentype or else "?"}"
+ end
+
+ var elsetype = v.diff_types(self, orig, mtype)
+ if elsetype != orig then
+ self.after_flow_context.when_false.set_var(v, variable, elsetype)
+ #debug "{variable}:{orig or else "?"} isa {mtype or else "?"} -> else {elsetype or else "?"}"
+ end
end
self.mtype = v.type_bool(self)
do
v.check_expr_cast(self, self.n_expr, self.n_type)
end
+
+ redef fun dump_info(v) do
+ var res = super
+ var mtype = self.cast_type
+ if mtype != null then
+ res += v.yellow(".as({mtype})")
+ end
+ return res
+ end
+
end
redef class AAsCastExpr
# The property invoked by the send.
var callsite: nullable CallSite
+ redef fun bad_expr_message(child)
+ do
+ if child == self.n_expr then
+ return "to be the receiver of `{self.property_name}`"
+ end
+ return null
+ end
+
redef fun accept_typing(v)
do
var nrecv = self.n_expr
fun raw_arguments: Array[AExpr] do return compute_raw_arguments
private fun compute_raw_arguments: Array[AExpr] is abstract
+
+ redef fun dump_info(v) do
+ var res = super
+ var callsite = self.callsite
+ if callsite != null then
+ res += v.yellow(" call="+callsite.dump_info(v))
+ end
+ return res
+ end
end
redef class ABinopExpr
if mtype == null or mtype2 == null then return
+ if mtype == v.type_bool(self) and (n_expr2 isa AFalseExpr or n_expr2 isa ATrueExpr) then
+ v.modelbuilder.warning(self, "useless-truism", "Warning: useless comparison to a Bool literal.")
+ end
+
if not mtype2 isa MNullType then return
v.check_can_be_null(n_expr, mtype)
redef fun accept_typing(v)
do
var anchor = v.anchor
- assert anchor != null
var recvtype = v.get_variable(self, v.selfvariable)
assert recvtype != null
var mproperty = v.mpropdef.mproperty
private fun process_superinit(v: TypeVisitor)
do
var anchor = v.anchor
- assert anchor != null
var recvtype = v.get_variable(self, v.selfvariable)
assert recvtype != null
var mpropdef = v.mpropdef
self.is_typed = true
end
+
+ redef fun dump_info(v) do
+ var res = super
+ var callsite = self.callsite
+ if callsite != null then
+ res += v.yellow(" super-init="+callsite.dump_info(v))
+ end
+ var mpropdef = self.mpropdef
+ if mpropdef != null then
+ res += v.yellow(" call-next-method="+mpropdef.to_s)
+ end
+ return res
+ end
end
####
var args = n_args.to_a
callsite.check_signature(v, node, args)
end
+
+ redef fun dump_info(v) do
+ var res = super
+ var callsite = self.callsite
+ if callsite != null then
+ res += v.yellow(" call="+callsite.dump_info(v))
+ end
+ return res
+ end
end
####
attr_type = v.resolve_for(attr_type, recvtype, self.n_expr isa ASelfExpr)
self.attr_type = attr_type
end
+
+ redef fun dump_info(v) do
+ var res = super
+ var mproperty = self.mproperty
+ var attr_type = self.attr_type
+ if mproperty != null then
+ res += v.yellow(" attr={mproperty}:{attr_type or else "BROKEN"}")
+ end
+ return res
+ end
end
redef class AAttrExpr
nitlanguage / nit.git / blobdiff