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
fun do_typing(tc: ToolContext)
do
var tv = new TypingVisitor(tc, self)
- tv.visit(node)
+ tv.enter_visit(node)
end
end
if n != null then n.accept_typing(self)
end
- # Current knowledge about variables names and types
- fun variable_ctx: VariableContext do return _variable_ctx.as(not null)
- writable var _variable_ctx: nullable 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
- fun base_variable_ctx: VariableContext do return _base_variable_ctx.as(not null)
- writable var _base_variable_ctx: nullable 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
- # Current knowledge about escapable blocks
- readable writable var _escapable_ctx: EscapableContext = new EscapableContext(self)
+ # 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
+
+ # 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
fun self_var: ParamVariable do return _self_var.as(not null)
writable var _self_var: nullable ParamVariable
# Block of the current method
- readable writable var _top_block: nullable PExpr
+ readable writable var _top_block: nullable AExpr
# List of explicit invocation of constructors of super-classes
readable writable var _explicit_super_init_calls: nullable Array[MMMethod]
# Is a other constructor of the same class invoked
readable writable var _explicit_other_init_call: Bool = false
- # Make the if_true_variable_ctx of the expression effective
- private fun 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 fun 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 var _once_count: Int = 0
- init(tc, module) do super
+ init(tc, mod) do super
- private fun get_default_constructor_for(n: PNode, c: MMLocalClass, prop: MMSrcMethod): nullable MMMethod
+ private fun get_default_constructor_for(n: ANode, c: MMLocalClass, prop: MMSrcMethod): nullable MMMethod
do
var v = self
#var prop = v.local_property
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
+redef class ANode
private fun accept_typing(v: TypingVisitor)
do
accept_abs_syntax_visitor(v)
private fun after_typing(v: TypingVisitor) do end
end
-redef class PClassdef
+redef class AClassdef
redef fun accept_typing(v)
do
- v.variable_ctx = new RootVariableContext(v, self)
- v.base_variable_ctx = v.variable_ctx
v.self_var = new ParamVariable("self".to_symbol, self)
v.self_var.stype = local_class.get_type
super
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 fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
- v.variable_ctx = old_var_ctx.sub(self)
+ 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.as(not null), prop.signature.return_type.as(not null))
end
- v.variable_ctx = old_var_ctx
+ v.scope_ctx.pop
end
end
redef class AMethPropdef
- redef fun self_var do return _self_var.as(not null)
- var _self_var: nullable ParamVariable
redef fun accept_typing(v)
do
- var old_var_ctx = v.variable_ctx
- v.variable_ctx = old_var_ctx.sub(self)
+ 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.variable_ctx = old_var_ctx
+ v.scope_ctx.pop
end
end
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 var _super_init_calls: Array[MMMethod] = new Array[MMMethod]
- readable var _explicit_super_init_calls: Array[MMMethod] = new Array[MMMethod]
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 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)
+ cur_c = cur_m.global.intro.local_class.for_module(v.mmmodule)
end
var j = 0
while j < v.local_class.cshe.direct_greaters.length do
i += 1
if i < l then
cur_m = explicit_super_init_calls[i]
- cur_c = cur_m.global.intro.local_class.for_module(v.module)
+ cur_c = cur_m.global.intro.local_class.for_module(v.mmmodule)
else
cur_m = null
cur_c = null
end
end
-redef class PParam
+redef class AParam
redef fun after_typing(v)
do
- v.variable_ctx.add(variable)
+ v.scope_ctx.add_variable(variable)
end
end
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 escapable = new EscapableClosure(self, variable.closure, null)
+ 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.escapable_ctx.push(escapable)
+ v.scope_ctx.push_escapable(escapable, null)
+
+ 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
- fun stype: MMType do return _stype.as(not null)
- fun is_typed: Bool do return _stype != null
+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)
end
end
-redef class PExpr
+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.as(not null)
end
var _stype: nullable MMType
+ redef fun after_typing(v)
+ do
+ # Default behavior is to be happy
+ _is_typed = true
+ end
+
# Is the expression the implicit receiver
fun is_implicit_self: Bool do return false
# The variable accessed is any
fun its_variable: nullable Variable do return null
- # The variable type information if current boolean expression is true
- readable private var _if_true_variable_ctx: nullable 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 var _if_false_variable_ctx: nullable 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 fun after_typing(v)
do
- var va = new VarVariable(n_id.to_symbol, self)
+ var va = new VarVariable(n_id.to_symbol, n_id)
_variable = va
- v.variable_ctx.add(va)
- if n_expr != null then v.variable_ctx.mark_is_set(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.as(not null), 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.as(not null)) then return
- va.stype = n_expr.stype
+ va.stype = v.type_object.as_nullable
end
_is_typed = true
end
redef class ABlockExpr
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 fun after_typing(v)
do
- v.variable_ctx.unreash = true
+ v.mark_unreash(self)
var t = v.local_property.signature.return_type
+
+ 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.")
redef class AContinueExpr
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
redef class ABreakExpr
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.")
redef class AAbortExpr
redef fun after_typing(v)
do
- v.variable_ctx.unreash = true
+ 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
+ # 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 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.as(not null))
- 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.as(not null))
- 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 var _escapable: nullable EscapableBlock
-
+special AAbsControl
redef fun accept_typing(v)
do
- var escapable = new EscapableBlock(self)
- _escapable = escapable
- 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)
+ process_control(v, new EscapableBlock(self), n_label, true)
+ end
+
+ redef fun process_control_inside(v)
+ do
+ 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.as(not null))
- 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
+special AAbsControl
var _variable: nullable AutoVariable
redef fun variable do return _variable.as(not null)
- # The corresponding escapable block
- readable var _escapable: nullable EscapableBlock
-
- var _meth_iterator: nullable MMMethod
- fun meth_iterator: MMMethod do return _meth_iterator.as(not null)
- var _meth_is_ok: nullable MMMethod
- fun meth_is_ok: MMMethod do return _meth_is_ok.as(not null)
- var _meth_item: nullable MMMethod
- fun meth_item: MMMethod do return _meth_item.as(not null)
- var _meth_next: nullable MMMethod
- fun meth_next: MMMethod do return _meth_next.as(not null)
redef fun accept_typing(v)
do
- var escapable = new EscapableBlock(self)
- _escapable = escapable
- v.escapable_ctx.push(escapable)
+ process_control(v, new EscapableBlock(self), n_label, true)
+ end
+
+ redef fun process_control_inside(v)
+ do
+ 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)
+ # Create the automatic variable
+ var va = new AutoVariable(n_id.to_symbol, n_id)
_variable = va
- v.variable_ctx.add(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.as(not null)
- _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
+ # 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
- if n_block != null then v.visit(n_block)
+ # Process inside
+ v.enter_visit_block(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 == begin of the loop
+ v.flow_ctx = old_flow_ctx
+ v.scope_ctx.pop
end
end
redef class AAssertExpr
- redef fun 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 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 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
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 null
end
var prop = lc.select_method(name)
- prop.global.check_visibility(v, self, v.module, false)
+ prop.global.check_visibility(v, self, v.mmmodule, false)
var psig = prop.signature_for(type_lvalue)
_assign_method = prop
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)
- readable var _assign_method: nullable MMMethod
+ redef fun assign_method do return _assign_method.as(not null)
+ var _assign_method: nullable MMMethod
end
redef class AVarReassignExpr
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
+redef class AAssignOp
fun method_name: Symbol is abstract
end
redef class APlusAssignOp
redef fun after_typing(v)
do
_variable = v.self_var
- _stype = v.variable_ctx.stype(variable)
+ _stype = v.flow_ctx.stype(variable)
_is_typed = true
end
redef class AIfexprExpr
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 AOrExpr
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
- v.visit(n_expr)
- v.use_if_false_variable_ctx(n_expr)
+ # Process left operand
+ v.enter_visit(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
+ # Prepare right operand context
+ v.use_if_false_flow_ctx(n_expr)
+
+ # 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 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
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 fun after_typing(v)
do
end
redef class AStringFormExpr
- var _meth_with_native: nullable MMMethod
- fun meth_with_native: MMMethod do return _meth_with_native.as(not null)
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
- fun meth_with_capacity: MMMethod do return _meth_with_capacity.as(not null)
- var _meth_with_capacity: nullable MMMethod
- fun meth_add: MMMethod do return _meth_add.as(not null)
- var _meth_add: nullable MMMethod
- fun meth_to_s: MMMethod do return _meth_to_s.as(not null)
- var _meth_to_s: nullable MMMethod
- readable var _atype: nullable MMType
+ 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
- _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
end
redef class AArrayExpr
- fun meth_with_capacity: MMMethod do return _meth_with_capacity.as(not null)
- var _meth_with_capacity: nullable MMMethod
- fun meth_add: MMMethod do return _meth_add.as(not null)
- var _meth_add: nullable MMMethod
-
redef fun after_typing(v)
do
var stype = v.check_conform_multiexpr(null, n_exprs)
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
- fun meth_init: MMMethod do return _meth_init.as(not null)
- var _meth_init: nullable MMMethod
redef fun after_typing(v)
do
if not v.check_expr(n_expr) or not v.check_expr(n_expr2) then return
end
end
-redef class ACrangeExpr
- redef fun after_typing(v)
- do
- super
- if not is_typed then return
- _meth_init = stype.local_class.select_method(once "init".to_symbol)
- end
-end
-redef class AOrangeExpr
- redef fun after_typing(v)
- do
- super
- if not is_typed then return
- _meth_init = stype.local_class.select_method(once "without_last".to_symbol)
- end
-end
-
-
redef class ASuperExpr
-special ASuperInitCall
- # readable var _prop: MMSrcMethod
- readable var _init_in_superclass: nullable MMMethod
+ 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
register_super_init_call(v, p)
if n_args.length > 0 then
var signature = get_signature(v, v.self_var.stype.as(not null), p, true)
- _arguments = process_signature(v, signature, p.name, n_args.to_a)
+ process_signature(v, signature, p.name, compute_raw_arguments)
end
else
v.error(self, "Error: No super method to call for {v.local_property}.")
var stype: nullable MMType = null
for prop in precs do
assert prop isa MMMethod
- 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)
+ var t = prop.signature_for(v.self_var.stype.as(not null)).return_type.for_module(v.mmmodule).adapt_to(v.local_property.signature.recv)
stypes.add(t)
if stype == null or stype < t then
stype = t
end
redef class AAttrFormExpr
- # Attribute accessed
- readable var _prop: nullable MMAttribute
+ redef fun prop do return _prop.as(not null)
+ var _prop: nullable MMAttribute
- # Attribute type of the acceded attribute
- readable var _attr_type: nullable MMType
+ redef fun attr_type do return _attr_type.as(not null)
+ var _attr_type: nullable MMType
# Compute the attribute accessed
private fun do_typing(v: TypingVisitor)
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}.")
return
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}")
+ if v.mmmodule.visibility_for(prop.global.local_class.mmmodule) < 3 then
+ v.error(self, "Error: Attribute {name} from {prop.global.local_class.mmmodule} is invisible in {v.mmmodule}")
end
_prop = prop
var at = prop.signature_for(type_recv).return_type
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
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
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)
redef fun after_typing(v)
do
do_typing(v)
- if prop == null then return
+ if _prop == null then return
if attr_type.is_nullable then
v.error(self, "Error: isset on a nullable attribute.")
end
end
end
-class AAbsAbsSendExpr
-special PExpr
+redef class AAbsAbsSendExpr
# The signature of the called property
- readable var _prop_signature: nullable 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 var _arguments: nullable 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 fun process_signature(v: TypingVisitor, psig: MMSignature, name: Symbol, raw_args: nullable Array[PExpr]): nullable 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 fun process_closures(v: TypingVisitor, psig: MMSignature, name: Symbol, cd: nullable Array[PClosureDef]): nullable 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: 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 fun do_typing(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, recv_is_self: Bool, name: Symbol, raw_args: nullable Array[PExpr], closure_defs: nullable 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)
- 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 fun get_property(v: TypingVisitor, type_recv: MMType, is_implicit_self: Bool, name: Symbol): nullable MMMethod
do
+ 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: 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
# Get the signature for a local property and a receiver
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)
+ prop.global.check_visibility(v, self, v.mmmodule, recv_is_self)
var psig = prop.signature_for(type_recv)
if not recv_is_self then psig = psig.not_for_self
return psig
end
# The invoked method (once computed)
- readable var _prop: nullable MMMethod
+ redef fun prop do return _prop.as(not null)
+ var _prop: nullable MMMethod
# The return type (if any) (once computed)
- readable var _return_type: nullable 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
+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 cla = v.mmmodule[property.global.intro.local_class.global]
var prev_class: nullable MMLocalClass = null
var esic = v.explicit_super_init_calls.as(not null)
if not esic.is_empty 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
esic.add(property)
end
redef class ANewExpr
-special AAbsSendExpr
+ 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
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
fun name: Symbol is abstract
- # Raw arguments used (withour star transformation)
- fun raw_arguments: nullable Array[PExpr] is abstract
-
# Closure definitions
- fun closure_defs: nullable Array[PClosureDef] do return null
+ redef fun closure_defs: nullable Array[AClosureDef] do return null
redef fun after_typing(v)
do
end
end
-class ASendReassignExpr
-special ASendExpr
-special AReassignFormExpr
- readable var _read_prop: nullable MMMethod
+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
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)
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 fun raw_arguments do return [n_expr2]
+ redef fun compute_raw_arguments do return [n_expr2]
end
redef class AEqExpr
redef fun name do return once "==".to_symbol
end
if n_expr.stype isa MMTypeNone then
- try_to_isa(v, n_expr2)
+ 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: PExpr)
+ private fun try_to_isa(v: TypingVisitor, n: AExpr)
do
var variable = n.its_variable
- if variable != null then
- _if_false_variable_ctx = v.variable_ctx.sub_with(self, variable, n.stype.as_notnull)
+ 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
end
if n_expr.stype isa MMTypeNone then
- try_to_isa(v, n_expr2)
+ 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: PExpr)
+ private fun try_to_isa(v: TypingVisitor, n: AExpr)
do
var variable = n.its_variable
- if variable != null then
- _if_true_variable_ctx = v.variable_ctx.sub_with(self, variable, n.stype.as_notnull)
+ 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 ALeExpr
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 fun name do return once ">".to_symbol
end
redef class AGeExpr
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 fun name do return once "+".to_symbol
end
redef class AUminusExpr
redef fun name do return once "unary -".to_symbol
- redef fun raw_arguments do return null
+ redef fun compute_raw_arguments do return null
end
redef class ACallFormExpr
do
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 = new AClosureCallExpr.init_aclosurecallexpr(n_id, n_args, n_closure_defs)
n._variable = variable
- n.after_typing(v)
- return
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
end
redef fun name do return n_id.to_symbol
- redef fun raw_arguments do return n_args.to_a
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class ACallAssignExpr
end
redef fun name do return (n_id.text + "=").to_symbol
- redef fun raw_arguments do
+ 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 fun variable_create(variable)
do
return new AVarReassignExpr.init_avarreassignexpr(n_id, n_assign_op, n_value)
end
redef fun name do return n_id.to_symbol
- redef fun raw_arguments do return n_args.to_a
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class ABraExpr
redef fun name do return once "[]".to_symbol
- redef fun raw_arguments do return n_args.to_a
+ 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 fun name do return once "[]=".to_symbol
- redef fun raw_arguments do
+ 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 fun name do return once "[]".to_symbol
- redef fun raw_arguments do return n_args.to_a
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class AInitExpr
redef fun name do return once "init".to_symbol
- redef fun raw_arguments do return n_args.to_a
+ redef fun compute_raw_arguments do return n_args.to_a
end
redef class AClosureCallExpr
-special AAbsAbsSendExpr
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)
if _accept_typing2 then super
end
- private fun accept_typing2(v: TypingVisitor, esc: EscapableClosure) is abstract
-end
-
-redef class AClosureDef
- redef fun 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
- 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 fun 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
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
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
nitlanguage / nit.git / blobdiff