package typing
import syntax_base
+import escape
+import control_flow
redef class MMSrcModule
# Walk trough the module and type statments and expressions
# Current knowledge about variables names and types
readable writable attr _variable_ctx: VariableContext
+ # Non-bypassable knowledge about variables names and types
+ readable writable attr _base_variable_ctx: VariableContext
+
+ # Current knowledge about escapable blocks
+ readable writable attr _escapable_ctx: EscapableContext = new EscapableContext(self)
+
# The current reciever
readable writable attr _self_var: ParamVariable
# Block of the current method
readable writable attr _top_block: PExpr
- # Current closure 'return' static type (if any)
- readable writable attr _closure_stype: MMType
-
# List of explicit invocation of constructors of super-classes
readable writable attr _explicit_super_init_calls: Array[MMMethod]
# Is a other constructor of the same class invoked
readable writable attr _explicit_other_init_call: Bool
+ # Make the if_true_variable_ctx of the expression effective
+ private meth use_if_true_variable_ctx(e: PExpr)
+ do
+ var ctx = e.if_true_variable_ctx
+ if ctx != null then variable_ctx = ctx
+ end
+
+ # Make the if_false_variable_ctx of the expression effective
+ private meth use_if_false_variable_ctx(e: PExpr)
+ do
+ var ctx = e.if_false_variable_ctx
+ if ctx != null then variable_ctx = ctx
+ end
+
+ # Number of nested once
+ readable writable attr _once_count: Int = 0
+
init(tc, module) do super
private meth get_default_constructor_for(n: PNode, c: MMLocalClass, prop: MMSrcMethod): MMMethod
end
end
-# Associate symbols to variable and variables to type
-# Can be nested
-private class VariableContext
- # Look for the variable from its name
- # Return null if nothing found
- meth [](s: Symbol): Variable
- do
- if _dico.has_key(s) then
- return _dico[s]
- else
- return null
- end
- end
-
- # Register a new variable with its name
- meth add(v: Variable)
- do
- _dico[v.name] = v
- end
-
-
- # The effective static type of a given variable
- # May be different from the declaration static type
- meth stype(v: Variable): MMType
- do
- return v.stype
- end
-
- # Variables by name (in the current context only)
- attr _dico: Map[Symbol, Variable]
-
- # Build a new VariableContext
- meth sub: SubVariableContext
- do
- return new SubVariableContext.with_prev(self, null, null)
- end
-
- # Build a nested VariableContext with new variable information
- meth sub_with(v: Variable, t: MMType): SubVariableContext
- do
- return new SubVariableContext.with_prev(self, v, t)
- end
-
- init
- do
- _dico = new HashMap[Symbol, Variable]
- end
-end
-
-private class SubVariableContext
-special VariableContext
- readable attr _prev: VariableContext
- attr _variable: Variable
- attr _var_type: MMType
-
- redef meth [](s)
- do
- if _dico.has_key(s) then
- return _dico[s]
- else
- return prev[s]
- end
- end
-
- redef meth stype(v)
- do
- if _variable == v then
- return _var_type
- end
- return prev.stype(v)
- end
-
- init with_prev(p: VariableContext, v: Variable, t: MMType)
- do
- init
- _prev = p
- _variable = v
- _var_type =t
- end
-end
-
###############################################################################
redef readable attr _self_var: ParamVariable
redef meth accept_typing(v)
do
- v.variable_ctx = new VariableContext
+ v.variable_ctx = new RootVariableContext(v, self)
+ v.base_variable_ctx = v.variable_ctx
_self_var = v.self_var
super
end
end
+redef class AConcreteMethPropdef
+ redef meth accept_typing(v)
+ do
+ super
+ if v.variable_ctx.unreash == false and method.signature.return_type != null then
+ v.error(self, "Control error: Reached end of function (a 'return' with a value was expected).")
+ end
+ end
+end
+
redef class AConcreteInitPropdef
readable attr _super_init_calls: Array[MMMethod] = new Array[MMMethod]
readable attr _explicit_super_init_calls: Array[MMMethod] = new Array[MMMethod]
end
redef class AClosureDecl
- redef meth after_typing(v)
+ # The corresponding escapable object
+ readable attr _escapable: EscapableBlock
+
+ redef meth accept_typing(v)
do
+ # Register the closure for ClosureCallExpr
v.variable_ctx.add(variable)
+
+ var old_var_ctx = v.variable_ctx
+ var old_base_var_ctx = v.base_variable_ctx
+ v.base_variable_ctx = v.variable_ctx
+ v.variable_ctx = v.variable_ctx.sub(self)
+
+ _escapable = new EscapableClosure(self, variable.closure, null)
+ v.escapable_ctx.push(_escapable)
+
+ super
+
+ if n_expr != null then
+ if v.variable_ctx.unreash == false then
+ if variable.closure.signature.return_type != null then
+ v.error(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
+ else if variable.closure.is_break then
+ v.error(self, "Control error: Reached end of break block (an 'abort' was expected).")
+ end
+ end
+ end
+
+ old_var_ctx.merge(v.variable_ctx)
+ v.variable_ctx = old_var_ctx
+ v.base_variable_ctx = old_base_var_ctx
+ v.escapable_ctx.pop
end
end
end
redef class PExpr
- redef readable attr _stype: MMType
-
+ redef readable attr _is_typed: Bool = false
+ redef meth is_statement: Bool do return _stype == null
+ redef meth stype
+ do
+ if not is_typed then
+ print "{locate}: not is_typed"
+ abort
+ end
+ if is_statement then
+ print "{locate}: is_statement"
+ abort
+ end
+ return _stype
+ end
+ attr _stype: MMType
+
# Is the expression the implicit receiver
meth is_implicit_self: Bool do return false
# The variable type information if current boolean expression is true
readable private attr _if_true_variable_ctx: VariableContext
+
+ # The variable type information if current boolean expression is false
+ readable private attr _if_false_variable_ctx: VariableContext
end
redef class AVardeclExpr
var va = new VarVariable(n_id.to_symbol, self)
variable = va
v.variable_ctx.add(va)
+ if n_expr != null then v.variable_ctx.mark_is_set(va)
if n_type != null then
va.stype = n_type.stype
v.check_conform_expr(n_expr, va.stype)
end
else
- v.check_expr(n_expr)
+ if not v.check_expr(n_expr) then return
va.stype = n_expr.stype
end
+ _is_typed = true
end
end
redef meth accept_typing(v)
do
var old_var_ctx = v.variable_ctx
- v.variable_ctx = v.variable_ctx.sub
+ v.variable_ctx = v.variable_ctx.sub(self)
- super
+ for e in n_expr do
+ if v.variable_ctx.unreash and not v.variable_ctx.already_unreash then
+ v.variable_ctx.already_unreash = true
+ v.warning(e, "Warning: unreachable statement.")
+ end
+ v.visit(e)
+ end
+ old_var_ctx.merge(v.variable_ctx)
v.variable_ctx = old_var_ctx
+ _is_typed = true
end
end
redef class AReturnExpr
redef meth after_typing(v)
do
+ v.variable_ctx.unreash = true
var t = v.local_property.signature.return_type
if n_expr == null and t != null then
v.error(self, "Error: Return without value in a function.")
else if n_expr != null and t != null then
v.check_conform_expr(n_expr, t)
end
+ _is_typed = true
end
end
redef class AContinueExpr
redef meth after_typing(v)
do
- var t = v.closure_stype
+ v.variable_ctx.unreash = true
+ var esc = compute_escapable_block(v.escapable_ctx)
+ if esc == null then return
+
+ if esc.is_break_block then
+ v.error(self, "Error: 'continue' forbiden in break blocks.")
+ return
+ end
+
+ var t = esc.continue_stype
if n_expr == null and t != null then
- v.error(self, "Error: continue with a value required in this bloc.")
+ v.error(self, "Error: continue with a value required in this block.")
else if n_expr != null and t == null then
- v.error(self, "Error: continue without value required in this bloc.")
+ v.error(self, "Error: continue without value required in this block.")
else if n_expr != null and t != null then
v.check_conform_expr(n_expr, t)
end
+ _is_typed = true
+ end
+end
+
+redef class ABreakExpr
+ redef meth after_typing(v)
+ do
+ v.variable_ctx.unreash = true
+ var esc = compute_escapable_block(v.escapable_ctx)
+ if esc == null then return
+
+ var bl = esc.break_list
+ if n_expr == null and bl != null then
+ v.error(self, "Error: break with a value required in this block.")
+ else if n_expr != null and bl == null then
+ v.error(self, "Error: break without value required in this block.")
+ else if n_expr != null and bl != null then
+ # Typing check can only be done later
+ bl.add(n_expr)
+ end
+ _is_typed = true
+ end
+end
+
+redef class AAbortExpr
+ redef meth after_typing(v)
+ do
+ v.variable_ctx.unreash = true
end
end
v.visit(n_expr)
v.check_conform_expr(n_expr, v.type_bool)
- if n_expr.if_true_variable_ctx != null then
- v.variable_ctx = n_expr.if_true_variable_ctx
+ # Prepare 'then' context
+ v.use_if_true_variable_ctx(n_expr)
+
+ # Process the 'then'
+ if n_then != null then
+ v.variable_ctx = v.variable_ctx.sub(n_then)
+ v.visit(n_then)
end
- v.visit(n_then)
- # Restore variable ctx
+ # Remember what appened in the 'then'
+ var then_var_ctx = v.variable_ctx
+
+ # Prepare 'else' context
v.variable_ctx = old_var_ctx
+ v.use_if_false_variable_ctx(n_expr)
+ # Process the 'else'
if n_else != null then
+ v.variable_ctx = v.variable_ctx.sub(n_else)
v.visit(n_else)
- v.variable_ctx = old_var_ctx
end
+
+ # Merge 'then' and 'else' contexts
+ old_var_ctx.merge2(then_var_ctx, v.variable_ctx, v.base_variable_ctx)
+ v.variable_ctx = old_var_ctx
+ _is_typed = true
end
end
redef class AWhileExpr
- redef meth after_typing(v)
+ # The corresponding escapable block
+ readable attr _escapable: EscapableBlock
+
+ redef meth accept_typing(v)
do
+ _escapable = new EscapableBlock(self)
+ v.escapable_ctx.push(_escapable)
+ var old_var_ctx = v.variable_ctx
+ var old_base_var_ctx = v.base_variable_ctx
+ v.base_variable_ctx = v.variable_ctx
+ v.variable_ctx = v.variable_ctx.sub(self)
+
+ super
+
v.check_conform_expr(n_expr, v.type_bool)
+ v.variable_ctx = old_var_ctx
+ v.base_variable_ctx = old_base_var_ctx
+ v.escapable_ctx.pop
+ _is_typed = true
end
end
redef class AForExpr
- redef meth after_typing(v)
- do
- # pop context created in AForVardeclExpr
- var varctx = v.variable_ctx
- assert varctx isa SubVariableContext
- v.variable_ctx = varctx.prev
- end
-end
+ # The corresponding escapable block
+ readable attr _escapable: EscapableBlock
-redef class AForVardeclExpr
- redef meth after_typing(v)
+ readable attr _meth_iterator: MMMethod
+ readable attr _meth_is_ok: MMMethod
+ readable attr _meth_item: MMMethod
+ readable attr _meth_next: MMMethod
+ redef meth accept_typing(v)
do
- v.variable_ctx = v.variable_ctx.sub
+ _escapable = new EscapableBlock(self)
+ v.escapable_ctx.push(_escapable)
+
+ var old_var_ctx = v.variable_ctx
+ var old_base_var_ctx = v.base_variable_ctx
+ v.base_variable_ctx = v.variable_ctx
+ v.variable_ctx = v.variable_ctx.sub(self)
var va = new AutoVariable(n_id.to_symbol, self)
variable = va
v.variable_ctx.add(va)
+ v.visit(n_expr)
+
+ if not v.check_conform_expr(n_expr, v.type_collection) then return
var expr_type = n_expr.stype
- if not v.check_conform_expr(n_expr, v.type_collection) then
+ _meth_iterator = expr_type.local_class.select_method(once ("iterator".to_symbol))
+ if _meth_iterator == null then
+ v.error(self, "Error: Collection MUST have an iterate method")
return
end
- var prop = expr_type.local_class.select_method(once ("iterator".to_symbol))
- if prop == null then
- v.error(self, "Error: Collection MUST have an iterate method")
+ var iter_type = _meth_iterator.signature_for(expr_type).return_type
+ _meth_is_ok = iter_type.local_class.select_method(once ("is_ok".to_symbol))
+ if _meth_is_ok == null then
+ v.error(self, "Error: {iter_type} MUST have an is_ok method")
return
end
- var iter_type = prop.signature_for(expr_type).return_type
- var prop2 = iter_type.local_class.select_method(once ("item".to_symbol))
- if prop2 == null then
+ _meth_item = iter_type.local_class.select_method(once ("item".to_symbol))
+ if _meth_item == null then
v.error(self, "Error: {iter_type} MUST have an item method")
return
end
- var t = prop2.signature_for(iter_type).return_type
+ _meth_next = iter_type.local_class.select_method(once ("next".to_symbol))
+ if _meth_next == null then
+ v.error(self, "Error: {iter_type} MUST have a next method")
+ return
+ end
+ var t = _meth_item.signature_for(iter_type).return_type
if not n_expr.is_self then t = t.not_for_self
va.stype = t
+
+ if n_block != null then v.visit(n_block)
+
+ # pop context
+ v.variable_ctx = old_var_ctx
+ v.base_variable_ctx = old_base_var_ctx
+ v.escapable_ctx.pop
+ _is_typed = true
end
end
redef meth after_typing(v)
do
v.check_conform_expr(n_expr, v.type_bool)
- if n_expr.if_true_variable_ctx != null then v.variable_ctx = n_expr.if_true_variable_ctx
+ v.use_if_true_variable_ctx(n_expr)
+ _is_typed = true
end
end
redef meth after_typing(v)
do
+ v.variable_ctx.check_is_set(self, variable)
_stype = v.variable_ctx.stype(variable)
+ _is_typed = _stype != null
end
end
redef class AVarAssignExpr
redef meth after_typing(v)
do
+ v.variable_ctx.mark_is_set(variable)
var t = v.variable_ctx.stype(variable)
- v.check_conform_expr(n_value, t)
+
+ # Check the base type
+ var btype = v.base_variable_ctx.stype(variable)
+ if not v.check_conform_expr(n_value, btype) then return
+
+ # Bypasse cast if then current type does not match
+ if not n_value.stype < t then v.variable_ctx.stype(variable) = btype
+
+ _is_typed = true
end
end
redef class AReassignFormExpr
- # Compute and check method used through the reassigment operator
- private meth do_lvalue_typing(v: TypingVisitor, type_lvalue: MMType)
+ # Compute and check method used through the reassigment operator
+ # On success return the static type of the result of the reassigment operator
+ # Else display an error and return null
+ private meth do_rvalue_typing(v: TypingVisitor, type_lvalue: MMType): MMType
do
if type_lvalue == null then
- return
+ return null
end
var name = n_assign_op.method_name
- var prop = type_lvalue.local_class.select_method(name)
- if prop == null then
+ var lc = type_lvalue.local_class
+ if not lc.has_global_property_by_name(name) then
v.error(self, "Error: Method '{name}' doesn't exists in {type_lvalue}.")
- return
+ return null
end
+ var prop = lc.select_method(name)
prop.global.check_visibility(v, self, v.module, false)
var psig = prop.signature_for(type_lvalue)
_assign_method = prop
- v.check_conform_expr(n_value, psig[0].not_for_self)
- v.check_conform(self, psig.return_type.not_for_self, n_value.stype)
+ if not v.check_conform_expr(n_value, psig[0].not_for_self) then return null
+ return psig.return_type.not_for_self
end
# Method used through the reassigment operator (once computed)
redef class AVarReassignExpr
redef meth after_typing(v)
do
+ v.variable_ctx.check_is_set(self, variable)
+ v.variable_ctx.mark_is_set(variable)
var t = v.variable_ctx.stype(variable)
- do_lvalue_typing(v, t)
+ var t2 = do_rvalue_typing(v, t)
+ if t2 == null then return
+
+ # Check the base type
+ var btype = v.base_variable_ctx.stype(variable)
+ if not v.check_conform(n_value, t2, btype) then return
+
+ # Bypasse cast if then current type does not match
+ if not t2 < t then v.variable_ctx.stype(variable) = btype
+
+ _is_typed = true
end
end
do
variable = v.self_var
_stype = v.variable_ctx.stype(variable)
+ _is_typed = true
end
redef meth is_self do return true
var old_var_ctx = v.variable_ctx
v.visit(n_expr)
- if n_expr.if_true_variable_ctx != null then v.variable_ctx = n_expr.if_true_variable_ctx
+ v.use_if_true_variable_ctx(n_expr)
v.visit(n_then)
v.variable_ctx = old_var_ctx
+ v.use_if_false_variable_ctx(n_expr)
v.visit(n_else)
v.check_conform_expr(n_expr, v.type_bool)
- if not v.check_expr(n_then) or not v.check_expr(n_else) then return
-
- var t = n_then.stype
- var te = n_else.stype
- if t < te then
- t = te
- else if not te < t then
- v.error(self, "Type error: {te} is not a subtype of {t}.")
- return
- end
-
- _stype = t
+ _stype = v.check_conform_multiexpr(null, [n_then, n_else])
+ _is_typed = _stype != null
end
end
redef meth after_typing(v)
do
_stype = v.type_bool
+ _is_typed = true
end
end
redef class AOrExpr
redef meth after_typing(v)
do
+ var old_var_ctx = v.variable_ctx
+
+ v.visit(n_expr)
+ v.use_if_false_variable_ctx(n_expr)
+
+ v.visit(n_expr2)
+ if n_expr2.if_false_variable_ctx != null then
+ _if_false_variable_ctx = n_expr2.if_false_variable_ctx
+ else
+ _if_false_variable_ctx = v.variable_ctx
+ end
+
+ v.variable_ctx = old_var_ctx
+
v.check_conform_expr(n_expr, v.type_bool)
v.check_conform_expr(n_expr2, v.type_bool)
_stype = v.type_bool
+ _is_typed = true
end
end
var old_var_ctx = v.variable_ctx
v.visit(n_expr)
- if n_expr.if_true_variable_ctx != null then v.variable_ctx = n_expr.if_true_variable_ctx
+ v.use_if_true_variable_ctx(n_expr)
v.visit(n_expr2)
if n_expr2.if_true_variable_ctx != null then
v.check_conform_expr(n_expr, v.type_bool)
v.check_conform_expr(n_expr2, v.type_bool)
_stype = v.type_bool
+ _is_typed = true
end
end
redef meth after_typing(v)
do
v.check_conform_expr(n_expr, v.type_bool)
+
+ # Invert if_true/if_false information
+ _if_false_variable_ctx = n_expr._if_true_variable_ctx
+ _if_true_variable_ctx = n_expr._if_false_variable_ctx
+
_stype = v.type_bool
+ _is_typed = true
end
end
redef meth after_typing(v)
do
_stype = v.type_int
-
+ _is_typed = true
end
end
redef meth after_typing(v)
do
_stype = v.type_float
+ _is_typed = true
end
end
redef meth after_typing(v)
do
_stype = v.type_char
+ _is_typed = true
end
end
redef class AStringFormExpr
+ readable attr _meth_with_native: MMMethod
redef meth after_typing(v)
do
_stype = v.type_string
+ _is_typed = true
+ _meth_with_native = _stype.local_class.select_method(once "with_native".to_symbol)
+ if _meth_with_native == null then v.error(self, "{_stype} MUST have a with_native method.")
end
end
redef class ASuperstringExpr
+ readable attr _meth_with_capacity: MMMethod
+ readable attr _meth_add: MMMethod
+ readable attr _meth_to_s: MMMethod
+ readable attr _atype: MMType
redef meth after_typing(v)
do
_stype = v.type_string
+ _atype = v.type_array(_stype)
+ _meth_with_capacity = _atype.local_class.select_method(once "with_capacity".to_symbol)
+ if _meth_with_capacity == null then v.error(self, "{_atype} MUST have a with_capacity method.")
+ _meth_add = _atype.local_class.select_method(once "add".to_symbol)
+ if _meth_add == null then v.error(self, "{_atype} MUST have an add method.")
+ _meth_to_s = v.type_object.local_class.select_method(once "to_s".to_symbol)
+ if _meth_to_s == null then v.error(self, "Object MUST have a to_s method.")
+ _is_typed = true
end
end
redef meth after_typing(v)
do
_stype = v.type_none
+ _is_typed = true
end
end
redef class AArrayExpr
- private meth stype=(t: MMType) do _stype = t
+ readable attr _meth_with_capacity: MMMethod
+ readable attr _meth_add: MMMethod
redef meth after_typing(v)
do
- var stype: MMType = null
- for n in n_exprs do
- var ntype = n.stype
- if stype == null or (ntype != null and stype < ntype) then
- stype = ntype
- end
- end
- for n in n_exprs do
- v.check_conform_expr(n, stype)
- end
- _stype = v.type_array(stype)
+ var stype = v.check_conform_multiexpr(null, n_exprs)
+ if stype == null then return
+ do_typing(v, stype)
+ end
+
+ private meth do_typing(v: TypingVisitor, element_type: MMType)
+ do
+ _stype = v.type_array(element_type)
+
+ _meth_with_capacity = _stype.local_class.select_method(once "with_capacity".to_symbol)
+ if _meth_with_capacity == null then v.error(self, "{_stype} MUST have a with_capacity method.")
+ _meth_add = _stype.local_class.select_method(once "add".to_symbol)
+ if _meth_add == null then v.error(self, "{_stype} MUST have an add method.")
+
+ _is_typed = true
end
end
redef class ARangeExpr
+ readable attr _meth_init: MMMethod
redef meth after_typing(v)
do
+ if not v.check_expr(n_expr) or not v.check_expr(n_expr2) then return
var ntype = n_expr.stype
var ntype2 = n_expr2.stype
- if ntype == null or ntype == null then
- return
- end
if ntype < ntype2 then
ntype = ntype2
else if not ntype2 < ntype then
return
end
var dtype = v.type_discrete
- v.check_conform_expr(n_expr, dtype)
- v.check_conform_expr(n_expr2, dtype)
+ if not v.check_conform_expr(n_expr, dtype) or not v.check_conform_expr(n_expr2, dtype) then return
_stype = v.type_range(ntype)
+ _is_typed = true
+ end
+end
+
+redef class ACrangeExpr
+ redef meth after_typing(v)
+ do
+ super
+ _meth_init = stype.local_class.select_method(once "init".to_symbol)
+ end
+end
+redef class AOrangeExpr
+ redef meth after_typing(v)
+ do
+ super
+ _meth_init = stype.local_class.select_method(once "without_last".to_symbol)
end
end
+
redef class ASuperExpr
special ASuperInitCall
# readable attr _prop: MMSrcMethod
var p = v.local_property
assert p isa MMSrcMethod
_prop = p
+ _is_typed = true
end
end
if not v.check_expr(n_expr) then return
var type_recv = n_expr.stype
var name = n_id.to_symbol
- var prop = type_recv.local_class.select_attribute(name)
- if prop == null then
+ var lc = type_recv.local_class
+ if not lc.has_global_property_by_name(name) then
v.error(self, "Error: Attribute {name} doesn't exists in {type_recv}.")
return
- else if v.module.visibility_for(prop.global.local_class.module) < 3 then
+ end
+ var prop = lc.select_attribute(name)
+ if v.module.visibility_for(prop.global.local_class.module) < 3 then
v.error(self, "Error: Attribute {name} from {prop.global.local_class.module} is invisible in {v.module}")
end
_prop = prop
redef meth after_typing(v)
do
do_typing(v)
- if prop == null then
- return
- end
+ if prop == null then return
_stype = attr_type
+ _is_typed = true
end
end
redef meth after_typing(v)
do
do_typing(v)
- if prop == null then
- return
- end
- v.check_conform_expr(n_value, attr_type)
+ if prop == null then return
+ if not v.check_conform_expr(n_value, attr_type) then return
+ _is_typed = true
end
end
redef meth after_typing(v)
do
do_typing(v)
- if prop == null then
- return
- end
- do_lvalue_typing(v, attr_type)
+ if prop == null then return
+ var t = do_rvalue_typing(v, attr_type)
+ if t == null then return
+ v.check_conform(self, t, n_value.stype)
+ _is_typed = true
end
end
-class AAbsSendExpr
+class AAbsAbsSendExpr
special PExpr
# The signature of the called property
readable attr _prop_signature: MMSignature
+ # The real arguments used (after star transformation) (once computed)
+ readable attr _arguments: Array[PExpr]
+
+ # Check the conformity of a set of arguments `raw_args' to a signature.
+ private meth process_signature(v: TypingVisitor, psig: MMSignature, name: Symbol, raw_args: Array[PExpr]): Array[PExpr]
+ do
+ var par_vararg = psig.vararg_rank
+ var par_arity = psig.arity
+ var raw_arity: Int
+ if raw_args == null then raw_arity = 0 else raw_arity = raw_args.length
+ if par_arity > raw_arity or (par_arity != raw_arity and par_vararg == -1) then
+ v.error(self, "Error: '{name}' arity missmatch.")
+ return null
+ end
+ var arg_idx = 0
+ var args = new Array[PExpr]
+ for par_idx in [0..par_arity[ do
+ var a: PExpr
+ var par_type = psig[par_idx]
+ if par_idx == par_vararg then
+ var star = new Array[PExpr]
+ for i in [0..(raw_arity-par_arity)] do
+ a = raw_args[arg_idx]
+ v.check_conform_expr(a, par_type)
+ star.add(a)
+ arg_idx = arg_idx + 1
+ end
+ var aa = new AArrayExpr.init_aarrayexpr(star)
+ aa.do_typing(v, par_type)
+ a = aa
+ else
+ a = raw_args[arg_idx]
+ v.check_conform_expr(a, par_type)
+ arg_idx = arg_idx + 1
+ end
+ args.add(a)
+ end
+ return args
+ end
+
+ # Check the conformity of a set of defined closures
+ private meth process_closures(v: TypingVisitor, psig: MMSignature, name: Symbol, cd: Array[PClosureDef]): MMType
+ do
+ var t = psig.return_type
+ var cs = psig.closures # Declared closures
+ var min_arity = 0
+ for c in cs do
+ if not c.is_optional then min_arity += 1
+ end
+ if cd != null then
+ if cs.length == 0 then
+ v.error(self, "Error: {name} does not require blocks.")
+ else if cd.length > cs.length or cd.length < min_arity then
+ v.error(self, "Error: {name} requires {cs.length} blocks, {cd.length} found.")
+ else
+ # Initialize the break list if a value is required for breaks (ie. if the method is a function)
+ var break_list: Array[ABreakExpr] = null
+ if t != null then break_list = new Array[ABreakExpr]
+
+ # Process each closure definition
+ for i in [0..cd.length[ do
+ var csi = cs[i]
+ var cdi = cd[i]
+ var esc = new EscapableClosure(cdi, csi, break_list)
+ v.escapable_ctx.push(esc)
+ cdi.accept_typing2(v, esc)
+ v.escapable_ctx.pop
+ end
+
+ # Check break type conformity
+ if break_list != null then
+ t = v.check_conform_multiexpr(t, break_list)
+ end
+ end
+ else if min_arity != 0 then
+ v.error(self, "Error: {name} requires {cs.length} blocks.")
+ end
+ return t
+ end
+end
+
+class AAbsSendExpr
+special AAbsAbsSendExpr
# Compute the called global property
- private meth do_typing(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, recv_is_self: Bool, name: Symbol, raw_args: Array[PExpr])
+ private meth do_typing(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, recv_is_self: Bool, name: Symbol, raw_args: Array[PExpr], closure_defs: Array[PClosureDef])
do
var prop = get_property(v, type_recv, is_implicit_self, name)
if prop == null then return
if sig == null then return
var args = process_signature(v, sig, prop.name, raw_args)
if args == null then return
+ var rtype = process_closures(v, sig, prop.name, closure_defs)
+ if rtype == null and sig.return_type != null then return
_prop = prop
_prop_signature = sig
_arguments = args
+ _return_type = rtype
end
private meth get_property(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, name: Symbol): MMMethod
do
if type_recv == null then return null
- var prop = type_recv.local_class.select_method(name)
+ var lc = type_recv.local_class
+ var prop: MMMethod = null
+ if lc.has_global_property_by_name(name) then prop = lc.select_method(name)
if prop == null and v.local_property.global.is_init then
var props = type_recv.local_class.super_methods_named(name)
if props.length > 1 then
return prop
end
+ # Get the signature for a local property and a receiver
private meth get_signature(v: TypingVisitor, type_recv: MMType, prop: MMMethod, recv_is_self: Bool): MMSignature
do
prop.global.check_visibility(v, self, v.module, recv_is_self)
if not recv_is_self then psig = psig.not_for_self
return psig
end
-
- # Check the conformity of a set of arguments `raw_args' to a signature.
- private meth process_signature(v: TypingVisitor, psig: MMSignature, name: Symbol, raw_args: Array[PExpr]): Array[PExpr]
- do
- var par_vararg = psig.vararg_rank
- var par_arity = psig.arity
- var raw_arity: Int
- if raw_args == null then raw_arity = 0 else raw_arity = raw_args.length
- if par_arity > raw_arity or (par_arity != raw_arity and par_vararg == -1) then
- v.error(self, "Error: '{name}' arity missmatch.")
- return null
- end
- var arg_idx = 0
- var args = new Array[PExpr]
- for par_idx in [0..par_arity[ do
- var a: PExpr
- var par_type = psig[par_idx]
- if par_idx == par_vararg then
- var star = new Array[PExpr]
- for i in [0..(raw_arity-par_arity)] do
- a = raw_args[arg_idx]
- v.check_conform_expr(a, par_type)
- star.add(a)
- arg_idx = arg_idx + 1
- end
- var aa = new AArrayExpr.init_aarrayexpr(star)
- aa.stype = v.type_array(par_type)
- a = aa
- else
- a = raw_args[arg_idx]
- v.check_conform_expr(a, par_type)
- arg_idx = arg_idx + 1
- end
- args.add(a)
- end
- return args
- end
# The invoked method (once computed)
readable attr _prop: MMMethod
- # The real arguments used (after star transformation) (once computed)
- readable attr _arguments: Array[PExpr]
+ # The return type (if any) (once computed)
+ readable attr _return_type: MMType
end
# A possible call of constructor in a super class
name = n_id.to_symbol
end
- do_typing(v, t, false, false, name, n_args.to_a)
+ do_typing(v, t, false, false, name, n_args.to_a, null)
if prop == null then return
if not prop.global.is_init then
v.error(self, "Error: {prop} is not a constructor.")
+ return
end
_stype = t
+ _is_typed = true
end
end
private meth do_all_typing(v: TypingVisitor)
do
if not v.check_expr(n_expr) then return
- do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, name, raw_arguments)
+ do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, name, raw_arguments, closure_defs)
if prop == null then return
- var cd = closure_defs
- var cs = _prop_signature.closures # Closure signatures
- if cd != null then
- if cs.length == 0 then
- v.error(self, "Error: property {prop} does not require blocs.")
- else if cs.length != cd.length then
- v.error(self, "Error: property {prop} requires {cs.length} blocs, {cd.length} found.")
- else
- for i in [0..cs.length[ do
- cd[i].accept_typing2(v, cs[i])
- end
- end
- else if cs.length != 0 then
- v.error(self, "Error: property {prop} requires {cs.length} blocs.")
- end
-
if prop.global.is_init then
if not v.local_property.global.is_init then
v.error(self, "Error: try to invoke constructor {prop} in a method.")
register_super_init_call(v, prop)
end
end
- var t = prop.signature_for(n_expr.stype).return_type
- if t != null and not n_expr.is_self then t = t.not_for_self
- _stype = t
+
+ _stype = return_type
+ _is_typed = true
end
end
do
if not v.check_expr(n_expr) then return
var raw_args = raw_arguments
- do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, name, raw_args)
+ do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, name, raw_args, null)
if prop == null then return
if prop.global.is_init then
if not v.local_property.global.is_init then
var t = prop.signature_for(n_expr.stype).return_type
if not n_expr.is_self then t = t.not_for_self
- do_lvalue_typing(v, t)
+ var t2 = do_rvalue_typing(v, t)
+ if t2 == null then return
+ v.check_conform(self, t2, n_value.stype)
_read_prop = prop
var old_args = arguments
raw_args.add(n_value)
- do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, "{name}=".to_symbol, raw_args)
+ do_typing(v, n_expr.stype, n_expr.is_implicit_self, n_expr.is_self, "{name}=".to_symbol, raw_args, null)
if prop == null then return
if prop.global.is_init then
if not v.local_property.global.is_init then
end
_arguments = old_args # FIXME: What if star parameters do not match betwen the two methods?
+ _is_typed = true
end
end
var variable = v.variable_ctx[name]
if variable != null then
if variable isa ClosureVariable then
- var n = new AClosureCallExpr(n_id, n_args, n_closure_defs)
+ var n = new AClosureCallExpr.init_aclosurecallexpr(n_id, n_args, n_closure_defs)
replace_with(n)
n.variable = variable
n.after_typing(v)
else
if not n_args.is_empty then
v.error(self, "Error: {name} is variable, not a function.")
+ return
end
var vform = variable_create(variable)
vform.variable = variable
end
end
end
+
super
end
-
+
redef meth closure_defs
do
if n_closure_defs == null or n_closure_defs.is_empty then
end
redef class AClosureCallExpr
+special AAbsAbsSendExpr
redef meth after_typing(v)
do
var va = variable
- var sig = va.signature
+ if va.closure.is_break then v.variable_ctx.unreash = true
+ var sig = va.closure.signature
var args = process_signature(v, sig, n_id.to_symbol, n_args.to_a)
+ if not n_closure_defs.is_empty then
+ process_closures(v, sig, n_id.to_symbol, n_closure_defs.to_a)
+ end
if args == null then return
- _prop = null
_prop_signature = sig
_arguments = args
_stype = sig.return_type
+ _is_typed = true
end
end
redef class PClosureDef
+ # The corresponding escapable object
+ readable attr _escapable: EscapableBlock
+
attr _accept_typing2: Bool
redef meth accept_typing(v)
do
if _accept_typing2 then super
end
- private meth accept_typing2(v: TypingVisitor, sig: MMSignature) is abstract
+ private meth accept_typing2(v: TypingVisitor, esc: EscapableClosure) is abstract
end
redef class AClosureDef
- redef meth accept_typing2(v, sig)
- do
+ redef meth accept_typing2(v, esc)
+ do
+ _escapable = esc
+
+ var sig = esc.closure.signature
if sig.arity != n_id.length then
v.error(self, "Error: {sig.arity} automatic variable names expected, {n_id.length} found.")
return
end
- signature = sig
-
- var old_stype = v.closure_stype
- v.closure_stype = sig.return_type
+ closure = esc.closure
- v.variable_ctx = v.variable_ctx.sub
+ var old_var_ctx = v.variable_ctx
+ var old_base_var_ctx = v.base_variable_ctx
+ v.base_variable_ctx = v.variable_ctx
+ v.variable_ctx = v.variable_ctx.sub(self)
variables = new Array[AutoVariable]
for i in [0..n_id.length[ do
var va = new AutoVariable(n_id[i].to_symbol, self)
_accept_typing2 = true
accept_typing(v)
- v.closure_stype = old_stype
+ if v.variable_ctx.unreash == false then
+ if closure.signature.return_type != null then
+ v.error(self, "Control error: Reached end of block (a 'continue' with a value was expected).")
+ else if closure.is_break then
+ v.error(self, "Control error: Reached end of break block (a 'break' was expected).")
+ end
+ end
+ v.variable_ctx = old_var_ctx
+ v.base_variable_ctx = old_base_var_ctx
+ end
+end
+
+class ATypeCheckExpr
+special PExpr
+ private meth check_expr_cast(v: TypingVisitor, n_expr: PExpr, n_type: PType)
+ do
+ if not v.check_expr(n_expr) then return
+ var etype = n_expr.stype
+ var ttype = n_type.stype
+ if etype == ttype then
+ v.warning(self, "Warning: Expression is already a {ttype}.")
+ else if etype < ttype then
+ v.warning(self, "Warning: Expression is already a {ttype} since it is a {etype}.")
+ end
end
end
redef class AIsaExpr
+special ATypeCheckExpr
redef meth after_typing(v)
do
+ check_expr_cast(v, n_expr, n_type)
var variable = n_expr.its_variable
if variable != null then
- _if_true_variable_ctx = v.variable_ctx.sub_with(variable, n_type.stype)
+ _if_true_variable_ctx = v.variable_ctx.sub_with(self, variable, n_type.stype)
end
_stype = v.type_bool
+ _is_typed = true
end
end
redef class AAsCastExpr
+special ATypeCheckExpr
redef meth after_typing(v)
do
- v.check_expr(n_expr)
+ check_expr_cast(v, n_expr, n_type)
_stype = n_type.stype
+ _is_typed = _stype != null
end
end
redef class AProxyExpr
redef meth after_typing(v)
do
+ if not n_expr.is_typed then return
+ _is_typed = true
+ if n_expr.is_statement then return
_stype = n_expr.stype
end
end
+
+redef class AOnceExpr
+ redef meth accept_typing(v)
+ do
+ if v.once_count > 0 then
+ v.warning(self, "Useless once in a once expression.")
+ end
+ v.once_count = v.once_count + 1
+
+ super
+
+ v.once_count = v.once_count - 1
+ end
+end
+
nitlanguage / nit.git / blobdiff