package typing
import syntax_base
-import escape
-import control_flow
+import flow
+import scope
redef class MMSrcModule
# Walk trough the module and type statments and expressions
# Require than supermodules are processed
- meth do_typing(tc: ToolContext)
+ fun do_typing(tc: ToolContext)
do
var tv = new TypingVisitor(tc, self)
- tv.visit(node)
+ tv.enter_visit(node)
end
end
# * Check type conformance
private class TypingVisitor
special AbsSyntaxVisitor
- redef meth visit(n)
+ redef fun visit(n)
do
if n != null then n.accept_typing(self)
end
- # Current knowledge about variables names and types
- readable writable attr _variable_ctx: VariableContext
+ # Current knowledge about scoped things (variable, labels, etc.)
+ readable var _scope_ctx: ScopeContext = new ScopeContext(self)
- # Non-bypassable knowledge about variables names and types
- readable writable attr _base_variable_ctx: VariableContext
+ # Current knowledge about control flow
+ fun flow_ctx: FlowContext do return _flow_ctx.as(not null)
+ writable var _flow_ctx: nullable FlowContext
+
+ # Mark a local variable as set
+ fun mark_is_set(va: Variable)
+ do
+ if flow_ctx.is_set(va) then return
+ flow_ctx = flow_ctx.sub_setvariable(va)
+ end
+
+ # Mark the flow context as unreashable
+ fun mark_unreash(n: ANode)
+ do
+ flow_ctx = flow_ctx.sub_unreash(n)
+ end
+
+ # Enter in an expression as inside a new local variable scope
+ fun enter_visit_block(node: nullable AExpr)
+ do
+ if node == null then return
+ scope_ctx.push(node)
+ enter_visit(node)
+ scope_ctx.pop
+ end
- # Current knowledge about escapable blocks
- readable writable attr _escapable_ctx: EscapableContext = new EscapableContext(self)
+ # Non-bypassable knowledge about variables names and types
+ fun base_flow_ctx: FlowContext do return _base_flow_ctx.as(not null)
+ writable var _base_flow_ctx: nullable FlowContext
# The current reciever
- readable writable attr _self_var: ParamVariable
+ fun self_var: ParamVariable do return _self_var.as(not null)
+ writable var _self_var: nullable ParamVariable
# Block of the current method
- readable writable attr _top_block: PExpr
+ readable writable var _top_block: nullable AExpr
# List of explicit invocation of constructors of super-classes
- readable writable attr _explicit_super_init_calls: Array[MMMethod]
+ readable writable var _explicit_super_init_calls: nullable Array[MMMethod]
# Is a other constructor of the same class invoked
- readable writable attr _explicit_other_init_call: Bool
+ readable writable var _explicit_other_init_call: Bool = false
- # Make the if_true_variable_ctx of the expression effective
- private meth use_if_true_variable_ctx(e: PExpr)
+ # Make the if_true_flow_ctx of the expression effective
+ private fun use_if_true_flow_ctx(e: AExpr)
do
- var ctx = e.if_true_variable_ctx
- if ctx != null then variable_ctx = ctx
+ var ctx = e.if_true_flow_ctx
+ if ctx != null then flow_ctx = ctx
end
- # Make the if_false_variable_ctx of the expression effective
- private meth use_if_false_variable_ctx(e: PExpr)
+ # Make the if_false_flow_ctx of the expression effective
+ private fun use_if_false_flow_ctx(e: AExpr)
do
- var ctx = e.if_false_variable_ctx
- if ctx != null then variable_ctx = ctx
+ var ctx = e.if_false_flow_ctx
+ if ctx != null then flow_ctx = ctx
end
+ # Are we inside a default closure definition ?
+ readable writable var _is_default_closure_definition: Bool = false
+
# Number of nested once
- readable writable attr _once_count: Int = 0
+ readable writable var _once_count: Int = 0
init(tc, module) do super
- private meth get_default_constructor_for(n: PNode, c: MMLocalClass, prop: MMSrcMethod): MMMethod
+ private fun get_default_constructor_for(n: ANode, c: MMLocalClass, prop: MMSrcMethod): nullable MMMethod
do
var v = self
#var prop = v.local_property
var gps = gp.signature_for(c.get_type)
assert gp isa MMSrcMethod
var garity = gps.arity
- if prop != null and gp.name == prop.name then
+ if gp.name == prop.name then
if garity == 0 or (parity == garity and prop.signature < gps) then
return gp
else
else if candidates.length > 0 then
var a = new Array[String]
for p in candidates do
- a.add("{p.full_name}{p.signature}")
+ a.add("{p.full_name}{p.signature.as(not null)}")
end
v.error(n, "Error: Conflicting default constructor to call for {c}: {a.join(", ")}.")
return null
else if false_candidates.length > 0 then
var a = new Array[String]
for p in false_candidates do
- a.add("{p.full_name}{p.signature}")
+ a.add("{p.full_name}{p.signature.as(not null)}")
end
v.error(n, "Error: there is no available compatible constrctor in {c}. Discarded candidates are {a.join(", ")}.")
return null
###############################################################################
-redef class PNode
- private meth accept_typing(v: TypingVisitor)
+redef class ANode
+ private fun accept_typing(v: TypingVisitor)
do
accept_abs_syntax_visitor(v)
after_typing(v)
end
- private meth after_typing(v: TypingVisitor) do end
+ private fun after_typing(v: TypingVisitor) do end
end
-redef class PClassdef
- redef meth accept_typing(v)
+redef class AClassdef
+ redef fun accept_typing(v)
do
v.self_var = new ParamVariable("self".to_symbol, self)
v.self_var.stype = local_class.get_type
end
end
+redef class APropdef
+ redef fun self_var do return _self_var.as(not null)
+ var _self_var: nullable ParamVariable
+end
+
redef class AAttrPropdef
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
+ v.flow_ctx = new RootFlowContext(v, self)
+ v.base_flow_ctx = v.flow_ctx
+
+ v.scope_ctx.push(self)
+ _self_var = v.self_var
super
if n_expr != null then
- v.check_conform_expr(n_expr, prop.signature.return_type)
+ v.check_conform_expr(n_expr.as(not null), prop.signature.return_type.as(not null))
end
+ v.scope_ctx.pop
end
end
redef class AMethPropdef
- redef readable attr _self_var: ParamVariable
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- v.variable_ctx = new RootVariableContext(v, self)
- v.base_variable_ctx = v.variable_ctx
+ v.flow_ctx = new RootFlowContext(v, self)
+ v.base_flow_ctx = v.flow_ctx
+
+ v.scope_ctx.push(self)
_self_var = v.self_var
super
+ v.scope_ctx.pop
end
end
redef class AConcreteMethPropdef
- redef meth accept_typing(v)
+ redef fun after_typing(v)
do
super
- if v.variable_ctx.unreash == false and method.signature.return_type != null then
+ if not v.flow_ctx.unreash 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]
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
v.top_block = n_block
v.explicit_super_init_calls = explicit_super_init_calls
v.explicit_other_init_call = false
super
+ end
+
+ redef fun after_typing(v)
+ do
+ super
if v.explicit_other_init_call or method.global.intro != method then
# TODO: something?
else
var i = 0
var l = explicit_super_init_calls.length
- var cur_m: MMMethod = null
- var cur_c: MMLocalClass = null
+ var cur_m: nullable MMMethod = null
+ var cur_c: nullable MMLocalClass = null
if i < l then
cur_m = explicit_super_init_calls[i]
cur_c = cur_m.global.intro.local_class.for_module(v.module)
j += 1
else if cur_c != null and (c.cshe <= cur_c or cur_c.global.is_mixin) then
if c == cur_c then j += 1
- super_init_calls.add(cur_m)
+ super_init_calls.add(cur_m.as(not null))
i += 1
if i < l then
cur_m = explicit_super_init_calls[i]
end
end
-redef class PParam
- redef meth after_typing(v)
+redef class AParam
+ redef fun after_typing(v)
do
- # TODO: why the test?
- if v.variable_ctx != null then
- v.variable_ctx.add(variable)
- end
+ v.scope_ctx.add_variable(variable)
end
end
redef class AClosureDecl
# The corresponding escapable object
- readable attr _escapable: EscapableBlock
+ readable var _escapable: nullable EscapableBlock
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
# Register the closure for ClosureCallExpr
- v.variable_ctx.add(variable)
+ v.scope_ctx.add_variable(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)
+ var old_flow_ctx = v.flow_ctx
+ var old_base_flow_ctx = v.base_flow_ctx
+ v.base_flow_ctx = v.flow_ctx
+
+ var blist: nullable Array[AExpr] = null
+ var t = v.local_property.signature.return_type
+ if t != null then blist = new Array[AExpr]
+ var escapable = new EscapableClosure(self, variable.closure, blist)
+ _escapable = escapable
+ v.scope_ctx.push_escapable(escapable, null)
- _escapable = new EscapableClosure(self, variable.closure, null)
- v.escapable_ctx.push(_escapable)
+ v.is_default_closure_definition = true
super
+ v.is_default_closure_definition = false
+
if n_expr != null then
- if v.variable_ctx.unreash == false then
+ if v.flow_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).")
+ else if variable.closure.is_break and escapable.break_list != null then
+ v.error(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
end
end
end
+ if blist != null then for x in blist do
+ v.check_conform_expr(x, t)
+ 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
+ v.flow_ctx = old_flow_ctx
+ v.base_flow_ctx = old_base_flow_ctx
+ v.scope_ctx.pop
end
end
-redef class PType
- readable attr _stype: MMType
- redef meth after_typing(v)
+redef class AType
+ redef fun stype: MMType do return _stype.as(not null)
+ redef fun is_typed: Bool do return _stype != null
+ var _stype: nullable MMType
+
+ redef fun after_typing(v)
do
_stype = get_stype(v)
end
end
-redef class PExpr
- redef readable attr _is_typed: Bool = false
- redef meth is_statement: Bool do return _stype == null
- redef meth stype
+redef class AExpr
+ redef readable var _is_typed: Bool = false
+ redef fun is_statement: Bool do return _stype == null
+ redef fun stype
do
if not is_typed then
- print "{locate}: not is_typed"
+ print "{location}: not is_typed"
abort
end
if is_statement then
- print "{locate}: is_statement"
+ print "{location}: is_statement"
abort
end
- return _stype
+ return _stype.as(not null)
+ end
+ var _stype: nullable MMType
+
+ redef fun after_typing(v)
+ do
+ # Default behavior is to be happy
+ _is_typed = true
end
- attr _stype: MMType
# Is the expression the implicit receiver
- meth is_implicit_self: Bool do return false
+ fun is_implicit_self: Bool do return false
# Is the expression the current receiver (implicit or explicit)
- meth is_self: Bool do return false
+ fun is_self: Bool do return false
# The variable accessed is any
- meth its_variable: Variable do return null
+ fun its_variable: nullable Variable do return null
- # The variable type information if current boolean expression is true
- readable private attr _if_true_variable_ctx: VariableContext
+ # The control flow information if current boolean expression is true
+ readable private var _if_true_flow_ctx: nullable FlowContext
- # The variable type information if current boolean expression is false
- readable private attr _if_false_variable_ctx: VariableContext
+ # The control flow information if current boolean expression is false
+ readable private var _if_false_flow_ctx: nullable FlowContext
end
redef class AVardeclExpr
- redef meth after_typing(v)
+ var _variable: nullable VarVariable
+ redef fun variable do return _variable.as(not null)
+
+ redef fun after_typing(v)
do
- 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)
+ var va = new VarVariable(n_id.to_symbol, n_id)
+ _variable = va
+ v.scope_ctx.add_variable(va)
+ var ne = n_expr
+ if ne != null then v.mark_is_set(va)
if n_type != null then
+ if not n_type.is_typed then return
va.stype = n_type.stype
- if n_expr != null then
- v.check_conform_expr(n_expr, va.stype)
+ if ne != null then
+ v.check_conform_expr(ne, va.stype)
end
+ else if ne != null then
+ if not v.check_expr(ne) then return
+ va.stype = ne.stype
else
- if not v.check_expr(n_expr) then return
- va.stype = n_expr.stype
+ va.stype = v.type_object.as_nullable
end
_is_typed = true
end
end
redef class ABlockExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
- v.variable_ctx = v.variable_ctx.sub(self)
-
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.")
+ if not v.flow_ctx.unreash then
+ v.enter_visit(e)
+ else if not v.flow_ctx.already_unreash then
+ v.flow_ctx.already_unreash = true
+ v.error(e, "Error: 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)
+ redef fun after_typing(v)
do
- v.variable_ctx.unreash = true
+ v.mark_unreash(self)
var t = v.local_property.signature.return_type
- if n_expr == null and t != null then
+
+ if v.is_default_closure_definition then
+ v.error(self, "Error: 'return' invalid in default closure definitions. Use 'continue' or 'break'.")
+ return
+ end
+
+ var e = n_expr
+ if e == null and t != null then
v.error(self, "Error: Return without value in a function.")
- else if n_expr != null and t == null then
+ else if e != null and t == null then
v.error(self, "Error: Return with value in a procedure.")
- else if n_expr != null and t != null then
- v.check_conform_expr(n_expr, t)
+ else if e != null and t != null then
+ v.check_conform_expr(e, t)
end
_is_typed = true
end
end
redef class AContinueExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- v.variable_ctx.unreash = true
- var esc = compute_escapable_block(v.escapable_ctx)
+ v.mark_unreash(self)
+ var esc = compute_escapable_block(v.scope_ctx)
if esc == null then return
if esc.is_break_block then
- v.error(self, "Error: 'continue' forbiden in break blocks.")
+ v.error(self, "Error: cannot 'continue', only 'break'.")
return
end
else if n_expr != null and t == null then
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)
+ v.check_conform_expr(n_expr.as(not null), t)
end
_is_typed = true
end
end
redef class ABreakExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- v.variable_ctx.unreash = true
- var esc = compute_escapable_block(v.escapable_ctx)
+ var old_flow_ctx = v.flow_ctx
+ v.mark_unreash(self)
+ var esc = compute_escapable_block(v.scope_ctx)
if esc == null then return
+ esc.break_flow_contexts.add(old_flow_ctx)
+
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.")
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)
+ bl.add(n_expr.as(not null))
end
_is_typed = true
end
end
redef class AAbortExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
+ do
+ v.mark_unreash(self)
+ _is_typed = true
+ end
+end
+
+# An abstract control structure with feature escapable block
+class AAbsControl
+special AExpr
+ # The corresponding escapable block
+ readable var _escapable: nullable EscapableBlock
+
+ # Enter and process a control structure
+ private fun process_control(v: TypingVisitor, escapable: EscapableBlock, n_label: nullable ALabel, is_loop: Bool)
do
- v.variable_ctx.unreash = true
+ # Register the escapable block
+ _escapable = escapable
+ v.scope_ctx.push_escapable(escapable, n_label)
+
+ # Save an prepare the contextes
+ var old_flow_ctx = v.flow_ctx
+ var old_base_flow_ctx = v.base_flow_ctx
+ if is_loop then v.base_flow_ctx = v.flow_ctx
+
+ # Do the main processing
+ process_control_inside(v)
+
+ # Add the end of the block as an exit context
+ if not v.flow_ctx.unreash then
+ escapable.break_flow_contexts.add(v.flow_ctx)
+ end
+
+ # Merge all exit contexts
+ if escapable.break_flow_contexts.is_empty then
+ v.flow_ctx = old_flow_ctx
+ v.mark_unreash(self)
+ else
+ v.flow_ctx = old_base_flow_ctx.merge(self, escapable.break_flow_contexts)
+ end
+
+ if is_loop then v.base_flow_ctx = old_base_flow_ctx
+ v.scope_ctx.pop
+ _is_typed = true
+ end
+
+ # What to do inside the control block?
+ private fun process_control_inside(v: TypingVisitor) is abstract
+end
+
+redef class ADoExpr
+special AAbsControl
+ redef fun accept_typing(v)
+ do
+ process_control(v, new BreakOnlyEscapableBlock(self), n_label, false)
+ end
+
+ redef fun process_control_inside(v)
+ do
+ v.enter_visit_block(n_block)
end
end
redef class AIfExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
- v.visit(n_expr)
+ v.enter_visit(n_expr)
v.check_conform_expr(n_expr, v.type_bool)
# Prepare 'then' context
- v.use_if_true_variable_ctx(n_expr)
+ var old_flow_ctx = v.flow_ctx
+ v.use_if_true_flow_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.enter_visit_block(n_then)
# Remember what appened in the 'then'
- var then_var_ctx = v.variable_ctx
+ var then_flow_ctx = v.flow_ctx
# Prepare 'else' context
- v.variable_ctx = old_var_ctx
- v.use_if_false_variable_ctx(n_expr)
+ v.flow_ctx = old_flow_ctx
+ v.use_if_false_flow_ctx(n_expr)
# Process the 'else'
- if n_else != null then
- v.variable_ctx = v.variable_ctx.sub(n_else)
- v.visit(n_else)
- end
+ v.enter_visit_block(n_else)
# 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
+ v.flow_ctx = v.base_flow_ctx.merge_reash(self, then_flow_ctx, v.flow_ctx)
_is_typed = true
end
end
redef class AWhileExpr
- # The corresponding escapable block
- readable attr _escapable: EscapableBlock
+special AAbsControl
+ redef fun accept_typing(v)
+ do
+ process_control(v, new EscapableBlock(self), n_label, true)
+ end
- redef meth accept_typing(v)
+ redef fun process_control_inside(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)
+ var old_flow_ctx = v.flow_ctx
# Process condition
- v.visit(n_expr)
+ v.enter_visit(n_expr)
v.check_conform_expr(n_expr, v.type_bool)
+ if n_expr isa ATrueExpr then
+ v.warning(self, "Warning: use 'loop' instead of 'while true do'.")
+ end
+
# Prepare inside context (assert cond)
- v.use_if_true_variable_ctx(n_expr)
+ v.use_if_true_flow_ctx(n_expr)
# Process inside
- if n_block != null then
- v.variable_ctx = v.variable_ctx.sub(n_block)
- v.visit(n_block)
- end
+ v.enter_visit_block(n_block)
- v.variable_ctx = old_var_ctx
- v.base_variable_ctx = old_base_var_ctx
- v.escapable_ctx.pop
- _is_typed = true
+ # Compute outside context (assert !cond + all breaks)
+ v.flow_ctx = old_flow_ctx
+ v.use_if_false_flow_ctx(n_expr)
+ escapable.break_flow_contexts.add(v.flow_ctx)
+ end
+end
+
+redef class ALoopExpr
+special AAbsControl
+ redef fun accept_typing(v)
+ do
+ process_control(v, new EscapableBlock(self), n_label, true)
+ end
+
+ redef fun process_control_inside(v)
+ do
+ # Process inside
+ v.enter_visit_block(n_block)
+
+ # Never automatically reach after the loop
+ v.mark_unreash(self)
end
end
redef class AForExpr
- # The corresponding escapable block
- readable attr _escapable: EscapableBlock
+special AAbsControl
+ var _variable: nullable AutoVariable
+ redef fun variable do return _variable.as(not null)
+
+ redef fun accept_typing(v)
+ do
+ process_control(v, new EscapableBlock(self), n_label, true)
+ end
- 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)
+ redef fun process_control_inside(v)
do
- _escapable = new EscapableBlock(self)
- v.escapable_ctx.push(_escapable)
+ v.scope_ctx.push(self)
+ var old_flow_ctx = v.flow_ctx
- 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)
+ # Create the automatic variable
+ var va = new AutoVariable(n_id.to_symbol, n_id)
+ _variable = va
+ v.scope_ctx.add_variable(va)
- v.visit(n_expr)
+ # Process collection
+ v.enter_visit(n_expr)
if not v.check_conform_expr(n_expr, v.type_collection) then return
var expr_type = n_expr.stype
- _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 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
- _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
- _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)
+ # Get iterator
+ var meth_iterator = v.get_method(expr_type, once "iterator".to_symbol)
+ var iter_type = meth_iterator.signature_for(expr_type).return_type.as(not null)
+ var meth_item = v.get_method(iter_type, once ("item".to_symbol))
+ var va_stype = meth_item.signature_for(iter_type).return_type.as(not null)
+ if not n_expr.is_self then va_stype = va_stype.not_for_self
+ va.stype = va_stype
- # pop context
- v.variable_ctx = old_var_ctx
- v.base_variable_ctx = old_base_var_ctx
- v.escapable_ctx.pop
- _is_typed = true
+ # Process inside
+ v.enter_visit_block(n_block)
+
+ # end == begin of the loop
+ v.flow_ctx = old_flow_ctx
+ v.scope_ctx.pop
end
end
redef class AAssertExpr
- redef meth after_typing(v)
+ redef fun accept_typing(v)
do
+ # Process condition
+ v.enter_visit(n_expr)
v.check_conform_expr(n_expr, v.type_bool)
- v.use_if_true_variable_ctx(n_expr)
+
+ # Process optional 'else' part
+ if n_else != null then
+ var old_flow_ctx = v.flow_ctx
+ v.use_if_false_flow_ctx(n_expr)
+ v.enter_visit(n_else)
+ v.flow_ctx = old_flow_ctx
+ end
+
+ # Prepare outside
+ v.use_if_true_flow_ctx(n_expr)
_is_typed = true
end
end
+redef class AVarFormExpr
+ var _variable: nullable Variable
+ redef fun variable do return _variable.as(not null)
+end
+
redef class AVarExpr
- redef meth its_variable do return variable
+ redef fun its_variable do return variable
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- v.variable_ctx.check_is_set(self, variable)
- _stype = v.variable_ctx.stype(variable)
+ v.flow_ctx.check_is_set(self, variable)
+ _stype = v.flow_ctx.stype(variable)
_is_typed = _stype != null
end
end
redef class AVarAssignExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- v.variable_ctx.mark_is_set(variable)
- var t = v.variable_ctx.stype(variable)
+ v.mark_is_set(variable)
# Check the base type
- var btype = v.base_variable_ctx.stype(variable)
- if not v.check_conform_expr(n_value, btype) then return
+ var btype = v.base_flow_ctx.stype(variable)
+ if not v.check_expr(n_value) then return
+ if btype != null and not v.check_conform_expr(n_value, btype) then return
# Always cast
- v.variable_ctx.stype(variable) = n_value.stype
+ v.flow_ctx = v.flow_ctx.sub_with(self, variable, n_value.stype)
_is_typed = true
end
# 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
+ private fun do_rvalue_typing(v: TypingVisitor, type_lvalue: nullable MMType): nullable MMType
do
if type_lvalue == null then
return null
end
var name = n_assign_op.method_name
+ if type_lvalue isa MMTypeNone then
+ v.error(self, "Error: Method '{name}' call on 'null'.")
+ return null
+ end
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 psig.return_type.not_for_self
end
- # Method used through the reassigment operator (once computed)
- readable attr _assign_method: MMMethod
+ redef fun assign_method do return _assign_method.as(not null)
+ var _assign_method: nullable MMMethod
end
redef class AVarReassignExpr
- redef meth after_typing(v)
+ redef fun 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)
+ v.flow_ctx.check_is_set(self, variable)
+ v.mark_is_set(variable)
+ var t = v.flow_ctx.stype(variable)
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
+ var btype = v.base_flow_ctx.stype(variable)
+ if not v.check_expr(n_value) then return
+ if btype != null and not v.check_conform(n_value, t2, btype) then return
# Always cast
- v.variable_ctx.stype(variable) = t2
+ v.flow_ctx = v.flow_ctx.sub_with(self, variable, t2)
_is_typed = true
end
end
-redef class PAssignOp
- meth method_name: Symbol is abstract
+redef class AAssignOp
+ fun method_name: Symbol is abstract
end
redef class APlusAssignOp
- redef meth method_name do return once "+".to_symbol
+ redef fun method_name do return once "+".to_symbol
end
redef class AMinusAssignOp
- redef meth method_name do return once "-".to_symbol
+ redef fun method_name do return once "-".to_symbol
end
redef class ASelfExpr
- redef meth its_variable do return variable
+ var _variable: nullable ParamVariable
+ redef fun variable do return _variable.as(not null)
+
+ redef fun its_variable do return variable
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- variable = v.self_var
- _stype = v.variable_ctx.stype(variable)
+ _variable = v.self_var
+ _stype = v.flow_ctx.stype(variable)
_is_typed = true
end
- redef meth is_self do return true
+ redef fun is_self do return true
end
redef class AImplicitSelfExpr
- redef meth is_implicit_self do return true
+ redef fun is_implicit_self do return true
end
redef class AIfexprExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
-
- v.visit(n_expr)
- 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)
+ var old_flow_ctx = v.flow_ctx
+ # Process condition
+ v.enter_visit(n_expr)
v.check_conform_expr(n_expr, v.type_bool)
- _stype = v.check_conform_multiexpr(null, [n_then, n_else])
- _is_typed = _stype != null
+ # Prepare 'then' context
+ v.use_if_true_flow_ctx(n_expr)
+
+ # Process 'then'
+ v.enter_visit_block(n_then)
+
+ # Remember what appened in the 'then'
+ var then_flow_ctx = v.flow_ctx
+
+ # Prepare 'else' context
+ v.flow_ctx = old_flow_ctx
+ v.use_if_false_flow_ctx(n_expr)
+
+ # Process 'else'
+ v.enter_visit_block(n_else)
+
+ # Merge 'then' and 'else' contexts
+ v.flow_ctx = v.base_flow_ctx.merge_reash(self, then_flow_ctx, v.flow_ctx)
+
+ var stype = v.check_conform_multiexpr(null, [n_then, n_else])
+ if stype == null then return
+
+ _stype = stype
+ _is_typed = true
end
end
redef class ABoolExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
_stype = v.type_bool
_is_typed = true
end
redef class AOrExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
+ var old_flow_ctx = v.flow_ctx
+ var stype = v.type_bool
+ _stype = stype
+
+ # Process left operand
+ v.enter_visit(n_expr)
- v.visit(n_expr)
- v.use_if_false_variable_ctx(n_expr)
+ # Prepare right operand context
+ v.use_if_false_flow_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
+ # Process right operand
+ v.enter_visit(n_expr2)
+ if n_expr2.if_false_flow_ctx != null then
+ _if_false_flow_ctx = n_expr2.if_false_flow_ctx
else
- _if_false_variable_ctx = v.variable_ctx
+ _if_false_flow_ctx = v.flow_ctx
end
- v.variable_ctx = old_var_ctx
+ v.flow_ctx = old_flow_ctx
- v.check_conform_expr(n_expr, v.type_bool)
- v.check_conform_expr(n_expr2, v.type_bool)
- _stype = v.type_bool
+ v.check_conform_expr(n_expr, stype)
+ v.check_conform_expr(n_expr2, stype)
+ _stype = stype
_is_typed = true
end
end
redef class AAndExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
+ var old_flow_ctx = v.flow_ctx
+ var stype = v.type_bool
- v.visit(n_expr)
- v.use_if_true_variable_ctx(n_expr)
+ # Process left operand
+ v.enter_visit(n_expr)
- v.visit(n_expr2)
- if n_expr2.if_true_variable_ctx != null then
- _if_true_variable_ctx = n_expr2.if_true_variable_ctx
+ # Prepare right operand context
+ v.use_if_true_flow_ctx(n_expr)
+
+ # Process right operand
+ v.enter_visit(n_expr2)
+ if n_expr2.if_true_flow_ctx != null then
+ _if_true_flow_ctx = n_expr2.if_true_flow_ctx
else
- _if_true_variable_ctx = v.variable_ctx
+ _if_true_flow_ctx = v.flow_ctx
end
- v.variable_ctx = old_var_ctx
+ v.flow_ctx = old_flow_ctx
- v.check_conform_expr(n_expr, v.type_bool)
- v.check_conform_expr(n_expr2, v.type_bool)
- _stype = v.type_bool
+ v.check_conform_expr(n_expr, stype)
+ v.check_conform_expr(n_expr2, stype)
+ _stype = stype
_is_typed = true
end
end
redef class ANotExpr
- redef meth after_typing(v)
+ redef fun 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
+ _if_false_flow_ctx = n_expr._if_true_flow_ctx
+ _if_true_flow_ctx = n_expr._if_false_flow_ctx
_stype = v.type_bool
_is_typed = true
end
end
+redef class AOrElseExpr
+ redef fun after_typing(v)
+ do
+ var old_flow_ctx = v.flow_ctx
+
+ # Process left operand
+ v.enter_visit(n_expr)
+ v.check_expr(n_expr)
+
+ # Consider the type of the left operand
+ var t = n_expr.stype
+ if not t.is_nullable then
+ v.warning(n_expr, "Warning: left operant of a 'or else' is not a nullable type.")
+ else
+ t = t.as_notnull
+ end
+
+ # Prepare the else context : ie the first expression is null
+ var variable = n_expr.its_variable
+ if variable != null then
+ v.flow_ctx.sub_with(self, variable, v.type_none)
+ end
+
+ # Process right operand
+ v.enter_visit(n_expr2)
+ v.check_expr(n_expr)
+
+ # Restore the context
+ v.flow_ctx = old_flow_ctx
+
+ # Merge the types
+ var stype = v.check_conform_multiexpr(t, [n_expr2])
+ if stype == null then return
+
+ _stype = stype
+ _is_typed = true
+ end
+end
+
redef class AIntExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
_stype = v.type_int
_is_typed = true
end
redef class AFloatExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
_stype = v.type_float
_is_typed = true
end
redef class ACharExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
_stype = v.type_char
_is_typed = true
end
redef class AStringFormExpr
- readable attr _meth_with_native: MMMethod
- redef meth after_typing(v)
+ redef fun 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.")
+ redef fun atype do return _atype.as(not null)
+ var _atype: nullable MMType
+ redef fun after_typing(v)
+ do
+ var otype = v.type_object
+ var stype = v.type_string
+ _stype = stype
+ for e in n_exprs do v.check_conform_expr(e, otype)
+ var atype = v.type_array(stype)
+ _atype = atype
_is_typed = true
end
end
redef class ANullExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
_stype = v.type_none
_is_typed = true
end
redef class AArrayExpr
- readable attr _meth_with_capacity: MMMethod
- readable attr _meth_add: MMMethod
-
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
var stype = v.check_conform_multiexpr(null, n_exprs)
- if stype == null then return
- do_typing(v, stype)
+ if stype != null then do_typing(v, stype)
end
- private meth do_typing(v: TypingVisitor, element_type: MMType)
+ private fun 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)
+ redef fun 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
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
- readable attr _init_in_superclass: MMMethod
- redef meth after_typing(v)
+ redef readable var _init_in_superclass: nullable MMMethod
+ redef fun compute_raw_arguments do return n_args.to_a
+ redef fun after_typing(v)
do
var precs: Array[MMLocalProperty] = v.local_property.prhe.direct_greaters
if not precs.is_empty then
_init_in_superclass = p
register_super_init_call(v, p)
if n_args.length > 0 then
- var signature = get_signature(v, v.self_var.stype, p, true)
- _arguments = process_signature(v, signature, p.name, n_args.to_a)
+ var signature = get_signature(v, v.self_var.stype.as(not null), p, true)
+ process_signature(v, signature, p.name, compute_raw_arguments)
end
else
v.error(self, "Error: No super method to call for {v.local_property}.")
return
end
- if precs.first.signature_for(v.self_var.stype).return_type != null then
+ if precs.first.signature_for(v.self_var.stype.as(not null)).return_type != null then
var stypes = new Array[MMType]
- var stype: MMType = null
+ var stype: nullable MMType = null
for prop in precs do
assert prop isa MMMethod
- var t = prop.signature_for(v.self_var.stype).return_type.for_module(v.module).adapt_to(v.local_property.signature.recv)
+ var t = prop.signature_for(v.self_var.stype.as(not null)).return_type.for_module(v.module).adapt_to(v.local_property.signature.recv)
stypes.add(t)
if stype == null or stype < t then
stype = t
end
end
for t in stypes do
- v.check_conform(self, t, stype)
+ v.check_conform(self, t, stype.as(not null))
end
_stype = stype
end
end
redef class AAttrFormExpr
- # Attribute accessed
- readable attr _prop: MMAttribute
+ redef fun prop do return _prop.as(not null)
+ var _prop: nullable MMAttribute
- # Attribute type of the acceded attribute
- readable attr _attr_type: MMType
+ redef fun attr_type do return _attr_type.as(not null)
+ var _attr_type: nullable MMType
# Compute the attribute accessed
- private meth do_typing(v: TypingVisitor)
+ private fun do_typing(v: TypingVisitor)
do
if not v.check_expr(n_expr) then return
var type_recv = n_expr.stype
var name = n_id.to_symbol
+ if type_recv isa MMTypeNone then
+ v.error(self, "Error: Attribute '{name}' access on 'null'.")
+ return
+ end
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}.")
end
redef class AAttrExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
do_typing(v)
- if prop == null then return
+ if _prop == null then return
_stype = attr_type
_is_typed = true
end
end
redef class AAttrAssignExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
do_typing(v)
- if prop == null then return
+ if _prop == null then return
if not v.check_conform_expr(n_value, attr_type) then return
_is_typed = true
end
end
redef class AAttrReassignExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
do_typing(v)
- if prop == null then return
+ 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)
end
end
-class AAbsAbsSendExpr
-special PExpr
+redef class AIssetAttrExpr
+ redef fun after_typing(v)
+ do
+ do_typing(v)
+ if _prop == null then return
+ if attr_type.is_nullable then
+ v.error(self, "Error: isset on a nullable attribute.")
+ end
+ _stype = v.type_bool
+ _is_typed = true
+ end
+end
+
+redef class AAbsAbsSendExpr
# The signature of the called property
- readable attr _prop_signature: MMSignature
+ redef fun prop_signature do return _prop_signature.as(not null)
+ var _prop_signature: nullable MMSignature
- # The real arguments used (after star transformation) (once computed)
- readable attr _arguments: Array[PExpr]
+ # Raw arguments used (without vararg transformation)
+ redef fun raw_arguments: Array[AExpr]
+ do
+ var res = _raw_arguments_cache
+ if res != null then
+ return res
+ else
+ res = compute_raw_arguments
+ if res == null then res = new Array[AExpr]
+ _raw_arguments_cache = res
+ return res
+ end
+ end
+
+ var _raw_arguments_cache: nullable Array[AExpr] = null
+
+ fun compute_raw_arguments: nullable Array[AExpr]
+ do
+ print "{location} no compute_raw_arguments"
+ return null
+ 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]
+ private fun process_signature(v: TypingVisitor, psig: MMSignature, name: Symbol, raw_args: nullable Array[AExpr]): Bool
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
+ v.error(self, "Error: arity missmatch; prototype is '{name}{psig}'.")
+ return false
end
var arg_idx = 0
- var args = new Array[PExpr]
for par_idx in [0..par_arity[ do
- var a: PExpr
+ var a: AExpr
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
+ return true
end
# Check the conformity of a set of defined closures
- private meth process_closures(v: TypingVisitor, psig: MMSignature, name: Symbol, cd: Array[PClosureDef]): MMType
+ private fun process_closures(v: TypingVisitor, psig: MMSignature, name: Symbol, cd: nullable Array[AClosureDef]): nullable MMType
do
var t = psig.return_type
var cs = psig.closures # Declared closures
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
+ var arity = 0
+ if cd != null then arity = cd.length
+ if cs.length > 0 then
+ if arity == 0 and min_arity > 0 then
+ v.error(self, "Error: {name} requires {cs.length} blocks.")
+ else if arity > cs.length or arity < 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
+ var break_list: nullable Array[ABreakExpr] = null
if t != null then break_list = new Array[ABreakExpr]
+ # The n_label, is any in only set on the last decl
+ var n_label = if arity > 0 then cd[arity-1].n_label else null
+
# Process each closure definition
- for i in [0..cd.length[ do
- var csi = cs[i]
+ for i in [0..arity[ do
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
+ var cni = cdi.n_id.to_symbol
+ var csi = psig.closure_named(cni)
+ if csi != null then
+ var esc = new EscapableClosure(cdi, csi, break_list)
+ v.scope_ctx.push_escapable(esc, n_label)
+ cdi.accept_typing2(v, esc)
+ v.scope_ctx.pop
+ else if cs.length == 1 then
+ v.error(cdi.n_id, "Error: no closure named '!{cni}' in {name}; only closure is !{cs.first.name}.")
+ else
+ var a = new Array[String]
+ for c in cs do
+ a.add("!{c.name}")
+ end
+ v.error(cdi.n_id, "Error: no closure named '!{cni}' in {name}; only closures are {a.join(",")}.")
+ end
end
# Check break type conformity
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.")
+ else if arity != 0 then
+ v.error(self, "Error: {name} does not require blocks.")
end
return t
end
end
-class AAbsSendExpr
-special AAbsAbsSendExpr
+redef class AAbsSendExpr
# 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], closure_defs: Array[PClosureDef])
+ private fun do_typing(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, recv_is_self: Bool, name: Symbol, raw_args: nullable Array[AExpr], closure_defs: nullable Array[AClosureDef])
do
var prop = get_property(v, type_recv, is_implicit_self, name)
if prop == null then return
var sig = get_signature(v, type_recv, prop, recv_is_self)
- if sig == null then return
- var args = process_signature(v, sig, prop.name, raw_args)
- if args == null then return
+ if not process_signature(v, sig, prop.name, raw_args) 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
+ private fun get_property(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, name: Symbol): nullable MMMethod
do
- if type_recv == null then return null
+ if type_recv isa MMTypeNone then
+ if name == (once "==".to_symbol) or name == (once "!=".to_symbol) then
+ # Special case on != and == that are allowed for 'null'
+ type_recv = v.type_object.as_nullable
+ else
+ v.error(self, "Error: Method '{name}' call on 'null'.")
+ return null
+ end
+ end
var lc = type_recv.local_class
- var prop: MMMethod = null
+ var prop: nullable 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)
+ var props = lc.super_methods_named(name)
if props.length > 1 then
v.error(self, "Error: Ambigous method name '{name}' for {props.join(", ")}. Use explicit designation.")
return null
else if props.length == 1 then
- var p = type_recv.local_class[props.first.global]
+ var p = lc[props.first.global]
assert p isa MMMethod
prop = p
end
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
+ private fun 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)
var psig = prop.signature_for(type_recv)
end
# The invoked method (once computed)
- readable attr _prop: MMMethod
+ redef fun prop do return _prop.as(not null)
+ var _prop: nullable MMMethod
# The return type (if any) (once computed)
- readable attr _return_type: MMType
+ redef readable var _return_type: nullable MMType
end
# A possible call of constructor in a super class
# Could be an explicit call or with the 'super' keyword
-class ASuperInitCall
-special AAbsSendExpr
- private meth register_super_init_call(v: TypingVisitor, property: MMMethod)
+redef class ASuperInitCall
+ private fun register_super_init_call(v: TypingVisitor, property: MMMethod)
do
if parent != v.top_block and self != v.top_block then
v.error(self, "Error: Constructor invocation {property} must not be in nested block.")
end
var cla = v.module[property.global.intro.local_class.global]
- var prev_class: MMLocalClass = null
- if not v.explicit_super_init_calls.is_empty then
- prev_class = v.explicit_super_init_calls.last.global.intro.local_class
+ var prev_class: nullable MMLocalClass = null
+ var esic = v.explicit_super_init_calls.as(not null)
+ if not esic.is_empty then
+ prev_class = esic.last.global.intro.local_class
end
var order = v.local_class.cshe.reverse_linear_extension
if cla == v.local_class then
else if cla == prev_class then
v.error(self, "Error: Only one super constructor invocation of class {cla} is allowed.")
else
- var last_is_found = prev_class == null
for c in order do
if c == prev_class then
- last_is_found = true
+ prev_class = null
else if c == cla then
- if not last_is_found then
+ if prev_class != null then
v.error(self, "Error: Constructor of {c} must be invoked before constructor of {prev_class}")
end
- v.explicit_super_init_calls.add(property)
+ esic.add(property)
break
end
end
end
redef class ANewExpr
-special AAbsSendExpr
- redef meth after_typing(v)
+ redef fun compute_raw_arguments do return n_args.to_a
+ redef fun after_typing(v)
do
+ if not n_type.is_typed then return
var t = n_type.stype
- if t == null then return
if t.local_class.global.is_abstract then
v.error(self, "Error: try to instantiate abstract class {t.local_class}.")
return
name = n_id.to_symbol
end
- do_typing(v, t, false, false, name, n_args.to_a, null)
- if prop == null then return
+ do_typing(v, t, false, false, name, raw_arguments, null)
+ if _prop == null then return
if not prop.global.is_init then
v.error(self, "Error: {prop} is not a constructor.")
redef class ASendExpr
-special ASuperInitCall
# Name of the invoked property
- meth name: Symbol is abstract
-
- # Raw arguments used (withour star transformation)
- meth raw_arguments: Array[PExpr] is abstract
+ fun name: Symbol is abstract
# Closure definitions
- meth closure_defs: Array[PClosureDef] do return null
+ redef fun closure_defs: nullable Array[AClosureDef] do return null
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
do_all_typing(v)
end
- private meth do_all_typing(v: TypingVisitor)
+ private fun 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, closure_defs)
- if prop == null then return
+ if _prop == null then return
+ var prop = _prop.as(not null)
if prop.global.is_init then
if not v.local_property.global.is_init then
end
end
-class ASendReassignExpr
-special ASendExpr
-special AReassignFormExpr
- readable attr _read_prop: MMMethod
- redef meth do_all_typing(v)
+redef class ASendReassignExpr
+ redef fun read_prop do return _read_prop.as(not null)
+ var _read_prop: nullable MMMethod
+ redef fun do_all_typing(v)
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, null)
+ var prop = _prop
if prop == null then return
if prop.global.is_init then
if not v.local_property.global.is_init then
v.error(self, "Error: constructor {prop} is not invoken on 'self'.")
end
end
- var t = prop.signature_for(n_expr.stype).return_type
+ var t = prop.signature_for(n_expr.stype).return_type.as(not null)
if not n_expr.is_self then t = t.not_for_self
var t2 = do_rvalue_typing(v, t)
v.check_conform(self, t2, n_value.stype)
_read_prop = prop
- var old_args = arguments
+ raw_args = raw_args.to_a
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, null)
- if prop == null then return
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.")
end
end
- _arguments = old_args # FIXME: What if star parameters do not match betwen the two methods?
_is_typed = true
end
end
redef class ABinopExpr
- redef meth raw_arguments do return [n_expr2]
+ redef fun compute_raw_arguments do return [n_expr2]
end
redef class AEqExpr
- redef meth name do return once "==".to_symbol
+ redef fun name do return once "==".to_symbol
+ redef fun after_typing(v)
+ do
+ super
+ if not n_expr.is_typed or not n_expr2.is_typed then return
+ if n_expr.stype isa MMTypeNone and not n_expr2.stype.is_nullable or
+ n_expr2.stype isa MMTypeNone and not n_expr.stype.is_nullable then
+ v.warning(self, "Warning: comparaison between null and a non nullable value.")
+ end
+
+ if n_expr.stype isa MMTypeNone then
+ if n_expr2.stype isa MMTypeNone then
+ v.warning(self, "Warning: comparaison between 2 null values.")
+ else
+ try_to_isa(v, n_expr2)
+ end
+ else if n_expr2.stype isa MMTypeNone then
+ try_to_isa(v, n_expr)
+ end
+ end
+
+ private fun try_to_isa(v: TypingVisitor, n: AExpr)
+ do
+ var variable = n.its_variable
+ if variable != null and n.stype isa MMNullableType then
+ _if_false_flow_ctx = v.flow_ctx.sub_with(self, variable, n.stype.as_notnull)
+ _if_true_flow_ctx = v.flow_ctx.sub_with(self, variable, v.type_none)
+ end
+ end
end
redef class ANeExpr
- redef meth name do return once "!=".to_symbol
+ redef fun name do return once "!=".to_symbol
+ redef fun after_typing(v)
+ do
+ super
+ if not n_expr.is_typed or not n_expr2.is_typed then return
+ if n_expr.stype isa MMTypeNone and not n_expr2.stype.is_nullable or
+ n_expr2.stype isa MMTypeNone and not n_expr.stype.is_nullable then
+ v.warning(self, "Warning: comparaison between null and a non nullable value.")
+ end
+
+ if n_expr.stype isa MMTypeNone then
+ if n_expr2.stype isa MMTypeNone then
+ v.warning(self, "Warning: comparaison between 2 null values.")
+ else
+ try_to_isa(v, n_expr2)
+ end
+ else if n_expr2.stype isa MMTypeNone then
+ try_to_isa(v, n_expr)
+ end
+ end
+
+ private fun try_to_isa(v: TypingVisitor, n: AExpr)
+ do
+ var variable = n.its_variable
+ if variable != null and n.stype isa MMNullableType then
+ _if_true_flow_ctx = v.flow_ctx.sub_with(self, variable, n.stype.as_notnull)
+ _if_false_flow_ctx = v.flow_ctx.sub_with(self, variable, v.type_none)
+ end
+ end
end
redef class ALtExpr
- redef meth name do return once "<".to_symbol
+ redef fun name do return once "<".to_symbol
end
redef class ALeExpr
- redef meth name do return once "<=".to_symbol
+ redef fun name do return once "<=".to_symbol
+end
+redef class ALlExpr
+ redef fun name do return once "<<".to_symbol
end
redef class AGtExpr
- redef meth name do return once ">".to_symbol
+ redef fun name do return once ">".to_symbol
end
redef class AGeExpr
- redef meth name do return once ">=".to_symbol
+ redef fun name do return once ">=".to_symbol
+end
+redef class AGgExpr
+ redef fun name do return once ">>".to_symbol
end
redef class APlusExpr
- redef meth name do return once "+".to_symbol
+ redef fun name do return once "+".to_symbol
end
redef class AMinusExpr
- redef meth name do return once "-".to_symbol
+ redef fun name do return once "-".to_symbol
end
redef class AStarshipExpr
- redef meth name do return once "<=>".to_symbol
+ redef fun name do return once "<=>".to_symbol
end
redef class AStarExpr
- redef meth name do return once "*".to_symbol
+ redef fun name do return once "*".to_symbol
end
redef class ASlashExpr
- redef meth name do return once "/".to_symbol
+ redef fun name do return once "/".to_symbol
end
redef class APercentExpr
- redef meth name do return once "%".to_symbol
+ redef fun name do return once "%".to_symbol
end
redef class AUminusExpr
- redef meth name do return once "unary -".to_symbol
- redef meth raw_arguments do return null
+ redef fun name do return once "unary -".to_symbol
+ redef fun compute_raw_arguments do return null
end
redef class ACallFormExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
- if n_expr != null and n_expr.is_implicit_self then
+ if n_expr.is_implicit_self then
var name = n_id.to_symbol
- var variable = v.variable_ctx[name]
+ var variable = v.scope_ctx[name]
if variable != null then
+ var n: AExpr
if variable isa ClosureVariable then
- var n = new AClosureCallExpr.init_aclosurecallexpr(n_id, n_args, n_closure_defs)
- replace_with(n)
- n.variable = variable
- n.after_typing(v)
- return
+ n = new AClosureCallExpr.init_aclosurecallexpr(n_id, n_args, n_closure_defs)
+ n._variable = variable
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
- replace_with(vform)
- vform.after_typing(v)
- return
+ n = variable_create(variable)
+ n._variable = variable
end
+ replace_with(n)
+ n.after_typing(v)
+ return
end
end
super
end
- redef meth closure_defs
+ redef fun closure_defs
do
- if n_closure_defs == null or n_closure_defs.is_empty then
+ if n_closure_defs.is_empty then
return null
else
return n_closure_defs.to_a
end
# Create a variable acces corresponding to the call form
- meth variable_create(variable: Variable): AVarFormExpr is abstract
+ fun variable_create(variable: Variable): AVarFormExpr is abstract
end
redef class ACallExpr
- redef meth variable_create(variable)
+ redef fun variable_create(variable)
do
return new AVarExpr.init_avarexpr(n_id)
end
- redef meth name do return n_id.to_symbol
- redef meth raw_arguments do return n_args.to_a
+ redef fun name do return n_id.to_symbol
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class ACallAssignExpr
- redef meth variable_create(variable)
+ redef fun variable_create(variable)
do
return new AVarAssignExpr.init_avarassignexpr(n_id, n_assign, n_value)
end
- redef meth name do return (n_id.text + "=").to_symbol
- redef meth raw_arguments do
+ redef fun name do return (n_id.text + "=").to_symbol
+ redef fun compute_raw_arguments do
var res = n_args.to_a
res.add(n_value)
return res
end
redef class ACallReassignExpr
-special ASendReassignExpr
- redef meth variable_create(variable)
+ redef fun variable_create(variable)
do
return new AVarReassignExpr.init_avarreassignexpr(n_id, n_assign_op, n_value)
end
- redef meth name do return n_id.to_symbol
- redef meth raw_arguments do return n_args.to_a
+ redef fun name do return n_id.to_symbol
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class ABraExpr
- redef meth name do return once "[]".to_symbol
- redef meth raw_arguments do return n_args.to_a
+ redef fun name do return once "[]".to_symbol
+ redef fun compute_raw_arguments do return n_args.to_a
+ redef fun closure_defs
+ do
+ if n_closure_defs.is_empty then
+ return null
+ else
+ return n_closure_defs.to_a
+ end
+ end
end
redef class ABraAssignExpr
- redef meth name do return once "[]=".to_symbol
- redef meth raw_arguments do
+ redef fun name do return once "[]=".to_symbol
+ redef fun compute_raw_arguments do
var res = n_args.to_a
res.add(n_value)
return res
end
redef class ABraReassignExpr
-special ASendReassignExpr
- redef meth name do return once "[]".to_symbol
- redef meth raw_arguments do return n_args.to_a
+ redef fun name do return once "[]".to_symbol
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class AInitExpr
- redef meth name do return once "init".to_symbol
- redef meth raw_arguments do return n_args.to_a
+ redef fun name do return once "init".to_symbol
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class AClosureCallExpr
-special AAbsAbsSendExpr
- redef meth after_typing(v)
+ var _variable: nullable ClosureVariable
+ redef fun variable do return _variable.as(not null)
+ redef fun compute_raw_arguments do return n_args.to_a
+
+ redef fun after_typing(v)
do
var va = variable
- if va.closure.is_break then v.variable_ctx.unreash = true
+ if va.closure.is_break then v.mark_unreash(self)
var sig = va.closure.signature
- var args = process_signature(v, sig, n_id.to_symbol, n_args.to_a)
+ var s = process_signature(v, sig, n_id.to_symbol, compute_raw_arguments)
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
+ if not s then return
_prop_signature = sig
- _arguments = args
_stype = sig.return_type
_is_typed = true
end
end
-redef class PClosureDef
+redef class AClosureId
+ fun to_symbol: Symbol is abstract
+end
+redef class ASimpleClosureId
+ redef fun to_symbol: Symbol do return n_id.to_symbol
+end
+redef class ABreakClosureId
+ redef fun to_symbol: Symbol do return n_kwbreak.to_symbol
+end
+
+redef class AClosureDef
+ var _closure: nullable MMClosure
+ redef fun closure do return _closure.as(not null)
+
# The corresponding escapable object
- readable attr _escapable: EscapableBlock
+ readable var _escapable: nullable EscapableBlock
- attr _accept_typing2: Bool
- redef meth accept_typing(v)
+ var _accept_typing2: Bool = false
+ redef fun accept_typing(v)
do
# Typing is deferred, wait accept_typing2(v)
if _accept_typing2 then super
end
- private meth accept_typing2(v: TypingVisitor, esc: EscapableClosure) is abstract
-end
-
-redef class AClosureDef
- redef meth accept_typing2(v, esc)
+ private fun accept_typing2(v: TypingVisitor, esc: EscapableClosure)
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.")
+ if sig.arity != n_ids.length then
+ v.error(self, "Error: {sig.arity} automatic variable names expected, {n_ids.length} found.")
return
end
- closure = esc.closure
+ _closure = esc.closure
- 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)
+ v.scope_ctx.push(self)
+ var old_flow_ctx = v.flow_ctx
+ var old_base_flow_ctx = v.base_flow_ctx
+ v.base_flow_ctx = v.flow_ctx
variables = new Array[AutoVariable]
- for i in [0..n_id.length[ do
- var va = new AutoVariable(n_id[i].to_symbol, self)
+ for i in [0..n_ids.length[ do
+ var va = new AutoVariable(n_ids[i].to_symbol, n_ids[i])
variables.add(va)
va.stype = sig[i]
- v.variable_ctx.add(va)
+ v.scope_ctx.add_variable(va)
end
_accept_typing2 = true
accept_typing(v)
- if v.variable_ctx.unreash == false then
+ if v.flow_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).")
+ else if closure.is_break and esc.break_list != null then
+ v.error(self, "Control error: Reached end of break block (a 'break' with a value was expected).")
end
end
- v.variable_ctx = old_var_ctx
- v.base_variable_ctx = old_base_var_ctx
+ v.flow_ctx = old_flow_ctx
+ v.base_flow_ctx = old_base_flow_ctx
+ v.scope_ctx.pop
end
end
class ATypeCheckExpr
-special PExpr
- private meth check_expr_cast(v: TypingVisitor, n_expr: PExpr, n_type: PType)
+special AExpr
+ private fun check_expr_cast(v: TypingVisitor, n_expr: AExpr, n_type: AType)
do
if not v.check_expr(n_expr) then return
+ if not n_type.is_typed 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}.")
+ else if etype isa MMTypeNone then
+ # ttype is not nullable because of prevous test
+ v.warning(self, "Warning: Expression is null therefore cannot be a {ttype}.")
+ else if etype.is_nullable and etype.as_notnull == ttype then
+ if ttype isa MMTypeFormal and ttype.bound.is_nullable then
+ # No warning in this case since with
+ # type T: nullable A
+ # var x: nullable T
+ # 'x.as(not null)' != 'x.as(T)'
+ # 'x != null' != 'x isa T'
+ else if self isa AIsaExpr then
+ v.warning(self, "Warning: Prefer '!= null'.")
+ else
+ v.warning(self, "Warning: Prefer '.as(not null)'.")
+ end
end
end
end
redef class AIsaExpr
special ATypeCheckExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
check_expr_cast(v, n_expr, n_type)
+ if not n_type.is_typed then return
var variable = n_expr.its_variable
if variable != null then
- _if_true_variable_ctx = v.variable_ctx.sub_with(self, variable, n_type.stype)
+ _if_true_flow_ctx = v.flow_ctx.sub_with(self, variable, n_type.stype)
end
_stype = v.type_bool
_is_typed = true
redef class AAsCastExpr
special ATypeCheckExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
check_expr_cast(v, n_expr, n_type)
+ if not n_type.is_typed then return
_stype = n_type.stype
_is_typed = _stype != null
end
end
+redef class AAsNotnullExpr
+ redef fun after_typing(v)
+ do
+ if not v.check_expr(n_expr) then return
+ var t = n_expr.stype
+ if t isa MMTypeNone then
+ v.error(n_expr, "Type error: 'as(not null)' on 'null' value.")
+ return
+ else if not t.is_nullable then
+ v.warning(n_expr, "Warning: 'as(not null)' on non nullable type.")
+ end
+ _stype = n_expr.stype.as_notnull
+ _is_typed = true
+ end
+end
+
redef class AProxyExpr
- redef meth after_typing(v)
+ redef fun after_typing(v)
do
if not n_expr.is_typed then return
_is_typed = true
end
redef class AOnceExpr
- redef meth accept_typing(v)
+ redef fun accept_typing(v)
do
if v.once_count > 0 then
v.warning(self, "Useless once in a once expression.")
nitlanguage / nit.git / blobdiff