1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 import auto_super_init
24 redef class ToolContext
25 # --discover-call-trace
26 var opt_discover_call_trace
: OptionBool = new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
31 self.option_context
.add_option
(self.opt_discover_call_trace
)
35 redef class ModelBuilder
36 # Execute the program from the entry point (Sys::main) of the `mainmodule'
37 # `arguments' are the command-line arguments in order
39 # 1. the AST is fully loaded.
40 # 2. the model is fully built.
41 # 3. the instructions are fully analysed.
42 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
45 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
47 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
48 init_naive_interpreter
(interpreter
, mainmodule
)
51 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
54 private fun init_naive_interpreter
(interpreter
: NaiveInterpreter, mainmodule
: MModule) do
55 var sys_type
= mainmodule
.sys_type
56 if sys_type
== null then return # no class Sys
57 var mainobj
= new MutableInstance(sys_type
)
58 interpreter
.mainobj
= mainobj
59 interpreter
.init_instance
(mainobj
)
60 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
)
61 if initprop
!= null then
62 interpreter
.send
(initprop
, [mainobj
])
64 interpreter
.check_init_instance
(mainobj
)
65 var mainprop
= mainmodule
.try_get_primitive_method
("main", sys_type
)
66 if mainprop
!= null then
67 interpreter
.send
(mainprop
, [mainobj
])
72 # The visitor that interprets the Nit Program by walking on the AST
73 private class NaiveInterpreter
74 # The modelbuilder that know the AST and its associations with the model
75 var modelbuilder
: ModelBuilder
77 # The main moduleof the program (used to lookup methoda
78 var mainmodule
: MModule
80 # The command line arguments of the interpreted program
81 # arguments.first is the program name
82 # arguments[1] is the first argument
83 var arguments
: Array[String]
85 var mainobj
: nullable Instance
87 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
89 self.modelbuilder
= modelbuilder
90 self.mainmodule
= mainmodule
91 self.arguments
= arguments
92 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
93 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
94 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
97 # Subtype test in the context of the mainmodule
98 fun is_subtype
(sub
, sup
: MType): Bool
100 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
103 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
105 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
, self.mainmodule
)
108 # Is a return executed?
109 # Set this mark to skip the evaluation until the end of the specified method frame
110 var returnmark
: nullable Frame = null
112 # Is a break executed?
113 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break'
114 var breakmark
: nullable EscapeMark = null
116 # Is a continue executed?
117 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue'
118 var continuemark
: nullable EscapeMark = null
120 # Is a return or a break or a continue executed?
121 # Use this function to know if you must skip the evaluation of statements
122 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
124 # The value associated with the current return/break/continue, if any.
125 # Set the value when you set a escapemark.
126 # Read the value when you catch a mark or reach the end of a method
127 var escapevalue
: nullable Instance = null
129 # If there is a break and is associated with `escapemark', then return true an clear the mark.
130 # If there is no break or if `escapemark' is null then return false.
131 # Use this function to catch a potential break.
132 fun is_break
(escapemark
: nullable EscapeMark): Bool
134 if escapemark
!= null and self.breakmark
== escapemark
then
135 self.breakmark
= null
142 # If there is a continue and is associated with `escapemark', then return true an clear the mark.
143 # If there is no continue or if `escapemark' is null then return false.
144 # Use this function to catch a potential continue.
145 fun is_continue
(escapemark
: nullable EscapeMark): Bool
147 if escapemark
!= null and self.continuemark
== escapemark
then
148 self.continuemark
= null
155 # Evaluate `n' as an expression in the current context.
156 # Return the value of the expression.
157 # If `n' cannot be evaluated, then aborts.
158 fun expr
(n
: AExpr): nullable Instance
160 var frame
= self.frame
161 var old
= frame
.current_node
162 frame
.current_node
= n
163 #n.debug("IN Execute expr")
165 if i
== null and not self.is_escaping
then
166 n
.debug
("inconsitance: no value and not escaping.")
168 var implicit_cast_to
= n
.implicit_cast_to
169 if implicit_cast_to
!= null then
170 var mtype
= self.unanchor_type
(implicit_cast_to
)
171 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed")
174 #n.debug("OUT Execute expr: value is {i}")
175 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
176 frame
.current_node
= old
180 # Evaluate `n' as a statement in the current context.
181 # Do nothing if `n' is sull.
182 # If `n' cannot be evaluated, then aborts.
183 fun stmt
(n
: nullable AExpr)
186 var frame
= self.frame
187 var old
= frame
.current_node
188 frame
.current_node
= n
189 #n.debug("Execute stmt")
191 frame
.current_node
= old
195 # Map used to store values of nodes that must be evaluated once in the system (AOnceExpr)
196 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
198 # Return the boolean instance associated with `val'.
199 fun bool_instance
(val
: Bool): Instance
201 if val
then return self.true_instance
else return self.false_instance
204 # Return the integer instance associated with `val'.
205 fun int_instance
(val
: Int): Instance
207 var ic
= self.mainmodule
.get_primitive_class
("Int")
208 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
211 # Return the char instance associated with `val'.
212 fun char_instance
(val
: Char): Instance
214 var ic
= self.mainmodule
.get_primitive_class
("Char")
215 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
218 # Return the float instance associated with `val'.
219 fun float_instance
(val
: Float): Instance
221 var ic
= self.mainmodule
.get_primitive_class
("Float")
222 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
225 # The unique intance of the `true' value.
226 var true_instance
: Instance
228 # The unique intance of the `false' value.
229 var false_instance
: Instance
231 # The unique intance of the `null' value.
232 var null_instance
: Instance
234 # Return a new array made of `values'.
235 # The dynamic type of the result is Array[elttype].
236 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
238 assert not elttype
.need_anchor
239 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
240 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
241 var res
= new MutableInstance(mtype
)
242 self.init_instance
(res
)
243 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
244 self.check_init_instance
(res
)
248 # Return a new native string initialized with `txt'
249 fun native_string_instance
(txt
: String): Instance
251 var val
= new Buffer.from
(txt
)
253 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
254 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
257 # The current frame used to store local variables of the current method executed
258 fun frame
: Frame do return frames
.first
260 # The stack of all frames. The first one is the current one.
261 var frames
: List[Frame] = new List[Frame]
263 # Return a stack stace. One line per function
264 fun stack_trace
: String
267 b
.append
(",---- Stack trace -- - - -\n")
269 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
271 b
.append
("`------------------- - - -")
275 # Exit the program with a message
276 fun fatal
(message
: String)
278 if frames
.is_empty
then
281 self.frame
.current_node
.fatal
(self, message
)
286 # Debug on the current node
287 fun debug
(message
: String)
289 if frames
.is_empty
then
292 self.frame
.current_node
.debug
(message
)
296 # Store known method, used to trace methods as thez are reached
297 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
299 # Execute `mpropdef' for a `args' (where args[0] is the receiver).
300 # Return a falue if `mpropdef' is a function, or null if it is a procedure.
301 # The call is direct/static. There is no message-seding/late-bindng.
302 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
304 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
305 self.discover_call_trace
.add mpropdef
306 self.debug
("Discovered {mpropdef}")
308 var vararg_rank
= mpropdef
.msignature
.vararg_rank
309 if vararg_rank
>= 0 then
310 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
312 args
= new Array[Instance]
314 args
.add
(rawargs
.first
) # recv
316 for i
in [0..vararg_rank
[ do
317 args
.add
(rawargs
[i
+1])
320 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
321 var vararg
= new Array[Instance]
322 for i
in [vararg_rank
..vararg_lastrank
] do
323 vararg
.add
(rawargs
[i
+1])
325 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
326 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
327 args
.add
(self.array_instance
(vararg
, elttype
))
329 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
330 args
.add
(rawargs
[i
+1])
333 if args
.length
< mpropdef
.msignature
.arity
+ 1 or args
.length
> mpropdef
.msignature
.arity
+ 1 + mpropdef
.msignature
.mclosures
.length
then
334 fatal
("NOT YET IMPLEMENTED: Invalid arity for {mpropdef}. {args.length} arguments given.")
336 if args
.length
< mpropdef
.msignature
.arity
+ 1 + mpropdef
.msignature
.mclosures
.length
then
337 fatal
("NOT YET IMPLEMENTED: default closures")
340 # Look for the AST node that implements the property
341 var mproperty
= mpropdef
.mproperty
342 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
343 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
344 self.parameter_check
(npropdef
, mpropdef
, args
)
345 return npropdef
.call
(self, mpropdef
, args
)
346 else if mproperty
.name
== "init" then
347 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
348 self.parameter_check
(nclassdef
, mpropdef
, args
)
349 return nclassdef
.call
(self, mpropdef
, args
)
351 fatal
("Fatal Error: method {mpropdef} not found in the AST")
356 # Generate type checks in the C code to check covariant parameters
357 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
359 var msignature
= mpropdef
.msignature
360 for i
in [0..msignature
.arity
[ do
361 # skip test for vararg since the array is instantiated with the correct polymorphic type
362 if msignature
.vararg_rank
== i
then continue
364 # skip if the cast is not required
365 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
366 if not origmtype
.need_anchor
then continue
368 # get the parameter type
369 var mtype
= msignature
.mparameters
[i
].mtype
370 var anchor
= args
.first
.mtype
.as(MClassType)
371 mtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
372 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, mtype
) then
373 node
.fatal
(self, "Cast failed")
378 fun call_closure
(closure
: ClosureInstance, args
: Array[Instance]): nullable Instance
380 var nclosuredef
= closure
.nclosuredef
381 var f
= closure
.frame
382 for i
in [0..closure
.nclosuredef
.mclosure
.mtype
.as(MSignature).arity
[ do
383 var variable
= nclosuredef
.variables
[i
]
384 f
.map
[variable
] = args
[i
]
387 self.frames
.unshift
(f
)
389 self.stmt
(nclosuredef
.n_expr
)
393 if self.is_continue
(nclosuredef
.escapemark
) then
394 var res
= self.escapevalue
395 self.escapevalue
= null
401 # Execute `mproperty' for a `args' (where args[0] is the receiver).
402 # Return a falue if `mproperty' is a function, or null if it is a procedure.
403 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
404 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
406 var recv
= args
.first
407 var mtype
= recv
.mtype
408 if mtype
isa MNullType then
409 if mproperty
.name
== "==" then
410 return self.bool_instance
(args
[0] == args
[1])
411 else if mproperty
.name
== "!=" then
412 return self.bool_instance
(args
[0] != args
[1])
414 #fatal("Reciever is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
415 fatal
("Reciever is null")
418 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
419 return self.call
(propdef
, args
)
422 # Read the attribute `mproperty' of an instance `recv' and return its value.
423 # If the attribute in not yet initialized, then aborts with an error message.
424 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
426 assert recv
isa MutableInstance
427 if not recv
.attributes
.has_key
(mproperty
) then
428 fatal
("Uninitialized attribute {mproperty.name}")
431 return recv
.attributes
[mproperty
]
434 # Collect attributes of a type in the order of their init
435 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
437 var cache
= self.collect_attr_propdef_cache
438 if cache
.has_key
(mtype
) then return cache
[mtype
]
440 var res
= new Array[AAttrPropdef]
441 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
442 self.mainmodule
.linearize_mclassdefs
(cds
)
444 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
445 for npropdef
in n
.n_propdefs
do
446 if npropdef
isa AAttrPropdef then
456 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
458 # Fill the initial values of the newly created instance `recv'.
459 # `recv.mtype' is used to know what must be filled.
460 fun init_instance
(recv
: Instance)
462 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
463 npropdef
.init_expr
(self, recv
)
467 # Check that non nullable attributes of `recv' are correctly initialized.
468 # This function is used as the last instruction of a new
469 # FIXME: this will work better once there is nullable types
470 fun check_init_instance
(recv
: Instance)
472 if not recv
isa MutableInstance then return
473 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
474 if npropdef
.n_expr
== null then
475 # Force read to check the initialization
476 self.read_attribute
(npropdef
.mpropdef
.mproperty
, recv
)
481 # This function determine the correct type according the reciever of the current definition (self).
482 fun unanchor_type
(mtype
: MType): MType
484 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
488 # An instance represents a value of the executed program.
489 abstract class Instance
490 # The dynamic type of the instance
491 # ASSERT: not self.mtype.is_anchored
494 # return true if the instance is the true value.
495 # return false if the instance is the true value.
497 fun is_true
: Bool do abort
499 # Return true if `self' IS `o' (using the Nit semantic of is)
500 fun eq_is
(o
: Instance): Bool do return self is o
502 # Human readable object identity "Type#number"
503 redef fun to_s
do return "{mtype}"
505 # Return the integer value if the instance is an integer.
507 fun to_i
: Int do abort
509 # Return the integer value if the instance is a float.
511 fun to_f
: Float do abort
513 # The real value encapsulated if the instance is primitive.
515 fun val
: Object do abort
518 # A instance with attribute (standards objects)
519 class MutableInstance
522 # The values of the attributes
523 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
526 # Special instance to handle primitives values (int, bool, etc.)
527 # The trick it just to encapsulate the <<real>> value
528 class PrimitiveInstance[E
: Object]
531 # The real value encapsulated
534 init(mtype
: MType, val
: E
)
542 if val
== true then return true
543 if val
== false then return false
549 if not o
isa PrimitiveInstance[Object] then return false
550 return self.val
== o
.val
555 if not o
isa PrimitiveInstance[Object] then return false
556 return self.val
is o
.val
559 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
561 redef fun to_i
do return val
.as(Int)
563 redef fun to_f
do return val
.as(Float)
566 private class ClosureInstance
571 var nclosuredef
: AClosureDef
573 init(mtype
: MType, frame
: Frame, nclosuredef
: AClosureDef)
577 self.nclosuredef
= nclosuredef
581 # Information about local variables in a running method
583 # The current visited node
584 # The node is stored by frame to keep a stack trace
585 var current_node
: ANode
586 # The executed property.
587 # A Method in case of a call, an attribute in case of a default initialization.
588 var mpropdef
: MPropDef
589 # Arguments of the method (the first is te receiver
590 var arguments
: Array[Instance]
591 # Mapping betwen a variable an the current value
592 var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
596 # Aborts the program with a message
597 # `v' is used to know if a colored message is displayed or not
598 private fun fatal
(v
: NaiveInterpreter, message
: String)
600 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
601 stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
603 stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
604 stderr
.write
(v
.stack_trace
)
612 # Execute a `mpropdef' associated with the current node.
613 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
615 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
620 redef class AConcreteMethPropdef
621 redef fun call
(v
, mpropdef
, args
)
623 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
624 for i
in [0..mpropdef
.msignature
.arity
[ do
625 var variable
= self.n_signature
.n_params
[i
].variable
626 assert variable
!= null
627 f
.map
[variable
] = args
[i
+1]
629 for i
in [0..mpropdef
.msignature
.mclosures
.length
[ do
630 var c
= mpropdef
.msignature
.mclosures
[i
]
631 var variable
= self.n_signature
.n_closure_decls
[i
].variable
632 assert variable
!= null
633 f
.map
[variable
] = args
[i
+ 1 + mpropdef
.msignature
.arity
]
638 # Call the implicit super-init
639 var auto_super_inits
= self.auto_super_inits
640 if auto_super_inits
!= null then
641 var selfarg
= [args
.first
]
642 for auto_super_init
in auto_super_inits
do
643 if auto_super_init
.intro
.msignature
.arity
== 0 then
644 v
.send
(auto_super_init
, selfarg
)
646 v
.send
(auto_super_init
, args
)
653 if v
.returnmark
== f
then
655 var res
= v
.escapevalue
663 redef class AInternMethPropdef
664 redef fun call
(v
, mpropdef
, args
)
666 var pname
= mpropdef
.mproperty
.name
667 var cname
= mpropdef
.mclassdef
.mclass
.name
668 if pname
== "output" then
669 var recv
= args
.first
672 else if pname
== "object_id" then
673 var recv
= args
.first
674 if recv
isa PrimitiveInstance[Object] then
675 return v
.int_instance
(recv
.val
.object_id
)
677 return v
.int_instance
(recv
.object_id
)
679 else if pname
== "output_class_name" then
680 var recv
= args
.first
683 else if pname
== "native_class_name" then
684 var recv
= args
.first
685 var txt
= recv
.mtype
.to_s
686 return v
.native_string_instance
(txt
)
687 else if pname
== "==" then
688 # == is correclt redefined for instances
689 return v
.bool_instance
(args
[0] == args
[1])
690 else if pname
== "!=" then
691 return v
.bool_instance
(args
[0] != args
[1])
692 else if pname
== "is_same_type" then
693 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
694 else if pname
== "exit" then
697 else if pname
== "sys" then
699 else if cname
== "Int" then
700 if pname
== "unary -" then
701 return v
.int_instance
(-args
[0].to_i
)
702 else if pname
== "succ" then
703 return v
.int_instance
(args
[0].to_i
+ 1)
704 else if pname
== "prec" then
705 return v
.int_instance
(args
[0].to_i
- 1)
706 else if pname
== "+" then
707 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
708 else if pname
== "-" then
709 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
710 else if pname
== "*" then
711 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
712 else if pname
== "%" then
713 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
714 else if pname
== "/" then
715 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
716 else if pname
== "<" then
717 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
718 else if pname
== ">" then
719 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
720 else if pname
== "<=" then
721 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
722 else if pname
== ">=" then
723 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
724 else if pname
== "<=>" then
725 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
726 else if pname
== "ascii" then
727 return v
.char_instance
(args
[0].to_i
.ascii
)
728 else if pname
== "to_f" then
729 return v
.float_instance
(args
[0].to_i
.to_f
)
730 else if pname
== "lshift" then
731 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
732 else if pname
== "rshift" then
733 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
735 else if cname
== "Char" then
736 var recv
= args
[0].val
.as(Char)
737 if pname
== "ascii" then
738 return v
.int_instance
(recv
.ascii
)
739 else if pname
== "succ" then
740 return v
.char_instance
(recv
.succ
)
741 else if pname
== "prec" then
742 return v
.char_instance
(recv
.prec
)
743 else if pname
== "<" then
744 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
745 else if pname
== ">" then
746 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
747 else if pname
== "<=" then
748 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
749 else if pname
== ">=" then
750 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
751 else if pname
== "<=>" then
752 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
754 else if cname
== "Float" then
755 if pname
== "unary -" then
756 return v
.float_instance
(-args
[0].to_f
)
757 else if pname
== "+" then
758 return v
.float_instance
(args
[0].to_f
+ args
[1].to_f
)
759 else if pname
== "-" then
760 return v
.float_instance
(args
[0].to_f
- args
[1].to_f
)
761 else if pname
== "*" then
762 return v
.float_instance
(args
[0].to_f
* args
[1].to_f
)
763 else if pname
== "/" then
764 return v
.float_instance
(args
[0].to_f
/ args
[1].to_f
)
765 else if pname
== "to_i" then
766 return v
.int_instance
(args
[0].to_f
.to_i
)
768 else if cname
== "NativeString" then
769 var recvval
= args
.first
.val
.as(Buffer)
770 if pname
== "[]" then
771 var arg1
= args
[1].to_i
772 if arg1
>= recvval
.length
or arg1
< 0 then
773 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
775 return v
.char_instance
(recvval
[arg1
])
776 else if pname
== "[]=" then
777 var arg1
= args
[1].to_i
778 if arg1
>= recvval
.length
or arg1
< 0 then
779 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
781 recvval
[arg1
] = args
[2].val
.as(Char)
783 else if pname
== "copy_to" then
784 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
785 var destval
= args
[1].val
.as(Buffer)
786 var lenval
= args
[2].to_i
787 var fromval
= args
[3].to_i
788 var toval
= args
[4].to_i
790 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
792 if fromval
+ lenval
>= recvval
.length
then
793 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
796 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
798 if toval
+ lenval
>= destval
.length
then
799 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
801 recvval
.copy
(fromval
, lenval
, destval
, toval
)
803 else if pname
== "atoi" then
804 return v
.int_instance
(recvval
.to_i
)
806 else if pname
== "calloc_string" then
807 return v
.native_string_instance
("!" * args
[1].to_i
)
808 else if cname
== "NativeArray" then
809 var recvval
= args
.first
.val
.as(Array[Instance])
810 if pname
== "[]" then
811 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
812 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
814 return recvval
[args
[1].to_i
]
815 else if pname
== "[]=" then
816 recvval
[args
[1].to_i
] = args
[2]
818 else if pname
== "copy_to" then
819 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
822 else if pname
== "calloc_array" then
823 var recvtype
= args
.first
.mtype
.as(MClassType)
825 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
826 mtype
= mtype
.arguments
.first
827 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
828 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
830 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
835 redef class AbstractArray[E
]
836 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
838 self.copy_to
(start
, len
, dest
, new_start
)
842 redef class AExternInitPropdef
843 redef fun call
(v
, mpropdef
, args
)
845 var pname
= mpropdef
.mproperty
.name
846 var cname
= mpropdef
.mclassdef
.mclass
.name
847 if pname
== "native_stdout" then
848 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdout
)
849 else if pname
== "native_stdin" then
850 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdin
)
851 else if pname
== "native_stderr" then
852 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stderr
)
853 else if pname
== "io_open_read" then
854 var a1
= args
[1].val
.as(Buffer)
855 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
856 else if pname
== "io_open_write" then
857 var a1
= args
[1].val
.as(Buffer)
858 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
860 fatal
(v
, "NOT YET IMPLEMENTED extern init {mpropdef}")
865 redef class AExternMethPropdef
867 redef fun call
(v
, mpropdef
, args
)
869 var pname
= mpropdef
.mproperty
.name
870 var cname
= mpropdef
.mclassdef
.mclass
.name
871 if cname
== "Int" then
872 var recvval
= args
.first
.val
.as(Int)
873 if pname
== "rand" then
874 var res
= recvval
.rand
875 return v
.int_instance
(res
)
877 else if cname
== "NativeFile" then
878 var recvval
= args
.first
.val
879 if pname
== "io_write" then
880 var a1
= args
[1].val
.as(Buffer)
881 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
))
883 else if pname
== "io_read" then
884 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
885 var a1
= args
[1].val
.as(Buffer)
886 new Buffer.from
(str
).copy
(0, str
.length
, a1
, 0)
887 return v
.int_instance
(str
.length
)
888 else if pname
== "io_close" then
889 recvval
.as(IOS).close
890 return v
.int_instance
(0)
892 else if cname
== "NativeString" then
893 var recvval
= args
.first
.val
.as(Buffer)
894 if pname
== "file_exists" then
895 return v
.bool_instance
(recvval
.to_s
.file_exists
)
896 else if pname
== "file_mkdir" then
899 else if pname
== "get_environ" then
900 var txt
= recvval
.to_s
.environ
901 return v
.native_string_instance
(txt
)
902 else if pname
== "system" then
903 var res
= sys
.system
(recvval
.to_s
)
904 return v
.int_instance
(res
)
905 else if pname
== "atof" then
906 return v
.float_instance
(recvval
.to_f
)
908 else if cname
== "Int" then
909 if pname
== "rand" then
910 return v
.int_instance
(args
[0].to_i
.rand
)
912 else if cname
== "Float" then
913 if pname
== "cos" then
914 return v
.float_instance
(args
[0].to_f
.cos
)
915 else if pname
== "sin" then
916 return v
.float_instance
(args
[0].to_f
.sin
)
918 else if pname
== "native_argc" then
919 return v
.int_instance
(v
.arguments
.length
)
920 else if pname
== "native_argv" then
921 var txt
= v
.arguments
[args
[1].to_i
]
922 return v
.native_string_instance
(txt
)
923 else if pname
== "get_time" then
924 return v
.int_instance
(get_time
)
925 else if pname
== "atan2" then
926 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
927 else if pname
== "pi" then
928 return v
.float_instance
(pi
)
929 else if pname
== "lexer_goto" then
930 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
931 else if pname
== "lexer_accept" then
932 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
933 else if pname
== "parser_goto" then
934 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
935 else if pname
== "parser_action" then
936 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
938 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
943 redef class AAttrPropdef
944 redef fun call
(v
, mpropdef
, args
)
946 var recv
= args
.first
947 assert recv
isa MutableInstance
948 var attr
= self.mpropdef
.mproperty
949 if args
.length
== 1 then
950 return v
.read_attribute
(attr
, recv
)
952 assert args
.length
== 2
953 recv
.attributes
[attr
] = args
[1]
958 # Evaluate and set the default value of the attribute in `recv'
959 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
961 assert recv
isa MutableInstance
962 var nexpr
= self.n_expr
963 if nexpr
!= null then
964 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
966 var val
= v
.expr
(nexpr
)
969 assert not v
.is_escaping
970 recv
.attributes
[self.mpropdef
.mproperty
] = val
973 var mtype
= self.mpropdef
.static_mtype
.as(not null)
974 # TODO The needinit info is statically computed, move it to modelbuilder or whatever
975 mtype
= mtype
.resolve_for
(self.mpropdef
.mclassdef
.bound_mtype
, self.mpropdef
.mclassdef
.bound_mtype
, self.mpropdef
.mclassdef
.mmodule
, true)
976 if mtype
isa MNullableType then
977 recv
.attributes
[self.mpropdef
.mproperty
] = v
.null_instance
982 redef class ADeferredMethPropdef
983 redef fun call
(v
, mpropdef
, args
)
985 fatal
(v
, "Deferred method called")
990 redef class AClassdef
991 # Execute an implicit `mpropdef' associated with the current node.
992 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
994 var super_inits
= self.super_inits
995 if super_inits
!= null then
996 assert args
.length
== 1
997 for su
in super_inits
do
1002 var recv
= args
.first
1003 assert recv
isa MutableInstance
1005 # Collect undefined attributes
1006 for npropdef
in self.n_propdefs
do
1007 if npropdef
isa AAttrPropdef and npropdef
.n_expr
== null then
1008 recv
.attributes
[npropdef
.mpropdef
.mproperty
] = args
[i
]
1017 # Evaluate the node as a possible expression.
1018 # Return a possible value
1019 # NOTE: Do not call this method directly, but use `v.expr'
1020 # This method is here to be implemented by subclasses.
1021 private fun expr
(v
: NaiveInterpreter): nullable Instance
1023 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1027 # Evaluate the node as a statement.
1028 # NOTE: Do not call this method directly, but use `v.stmt'
1029 # This method is here to be implemented by subclasses (no need to return something).
1030 private fun stmt
(v
: NaiveInterpreter)
1037 redef class ABlockExpr
1040 for e
in self.n_expr
do
1042 if v
.is_escaping
then return
1047 redef class AVardeclExpr
1050 var ne
= self.n_expr
1053 if i
== null then return
1054 v
.frame
.map
[self.variable
.as(not null)] = i
1059 redef class AVarExpr
1062 return v
.frame
.map
[self.variable
.as(not null)]
1066 redef class AVarAssignExpr
1069 var i
= v
.expr
(self.n_value
)
1070 if i
== null then return
1071 v
.frame
.map
[self.variable
.as(not null)] = i
1075 redef class AVarReassignExpr
1078 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1079 var value
= v
.expr
(self.n_value
)
1080 if value
== null then return
1081 var res
= v
.send
(reassign_property
.mproperty
, [vari
, value
])
1083 v
.frame
.map
[self.variable
.as(not null)] = res
1087 redef class ASelfExpr
1090 return v
.frame
.arguments
.first
1094 redef class AContinueExpr
1097 var ne
= self.n_expr
1100 if i
== null then return
1103 v
.continuemark
= self.escapemark
1107 redef class ABreakExpr
1110 var ne
= self.n_expr
1113 if i
== null then return
1116 v
.breakmark
= self.escapemark
1120 redef class AReturnExpr
1123 var ne
= self.n_expr
1126 if i
== null then return
1129 v
.returnmark
= v
.frame
1133 redef class AAbortExpr
1144 var cond
= v
.expr
(self.n_expr
)
1145 if cond
== null then return
1146 if cond
.is_true
then
1154 redef class AIfexprExpr
1157 var cond
= v
.expr
(self.n_expr
)
1158 if cond
== null then return null
1159 if cond
.is_true
then
1160 return v
.expr
(self.n_then
)
1162 return v
.expr
(self.n_else
)
1170 v
.stmt
(self.n_block
)
1171 v
.is_break
(self.escapemark
) # Clear the break (if any)
1175 redef class AWhileExpr
1179 var cond
= v
.expr
(self.n_expr
)
1180 if cond
== null then return
1181 if not cond
.is_true
then return
1182 v
.stmt
(self.n_block
)
1183 if v
.is_break
(self.escapemark
) then return
1184 v
.is_continue
(self.escapemark
) # Clear the break
1185 if v
.is_escaping
then return
1190 redef class ALoopExpr
1194 v
.stmt
(self.n_block
)
1195 if v
.is_break
(self.escapemark
) then return
1196 v
.is_continue
(self.escapemark
) # Clear the break
1197 if v
.is_escaping
then return
1202 redef class AForExpr
1205 var col
= v
.expr
(self.n_expr
)
1206 if col
== null then return
1207 #self.debug("col {col}")
1208 var iter
= v
.send
(v
.force_get_primitive_method
("iterator", col
.mtype
), [col
]).as(not null)
1209 #self.debug("iter {iter}")
1211 var isok
= v
.send
(v
.force_get_primitive_method
("is_ok", iter
.mtype
), [iter
]).as(not null)
1212 if not isok
.is_true
then return
1213 if self.variables
.length
== 1 then
1214 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1215 #self.debug("item {item}")
1216 v
.frame
.map
[self.variables
.first
] = item
1217 else if self.variables
.length
== 2 then
1218 var key
= v
.send
(v
.force_get_primitive_method
("key", iter
.mtype
), [iter
]).as(not null)
1219 v
.frame
.map
[self.variables
[0]] = key
1220 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1221 v
.frame
.map
[self.variables
[1]] = item
1225 v
.stmt
(self.n_block
)
1226 if v
.is_break
(self.escapemark
) then return
1227 v
.is_continue
(self.escapemark
) # Clear the break
1228 if v
.is_escaping
then return
1229 v
.send
(v
.force_get_primitive_method
("next", iter
.mtype
), [iter
])
1234 redef class AAssertExpr
1237 var cond
= v
.expr
(self.n_expr
)
1238 if cond
== null then return
1239 if not cond
.is_true
then
1241 if v
.is_escaping
then return
1244 fatal
(v
, "Assert '{nid.text}' failed")
1246 fatal
(v
, "Assert failed")
1256 var cond
= v
.expr
(self.n_expr
)
1257 if cond
== null then return null
1258 if cond
.is_true
then return cond
1259 return v
.expr
(self.n_expr2
)
1263 redef class AAndExpr
1266 var cond
= v
.expr
(self.n_expr
)
1267 if cond
== null then return null
1268 if not cond
.is_true
then return cond
1269 return v
.expr
(self.n_expr2
)
1273 redef class ANotExpr
1276 var cond
= v
.expr
(self.n_expr
)
1277 if cond
== null then return null
1278 return v
.bool_instance
(not cond
.is_true
)
1282 redef class AOrElseExpr
1285 var i
= v
.expr
(self.n_expr
)
1286 if i
== null then return null
1287 if i
!= v
.null_instance
then return i
1288 return v
.expr
(self.n_expr2
)
1295 var i
= v
.expr
(self.n_expr
)
1296 if i
== null then return null
1297 var i2
= v
.expr
(self.n_expr2
)
1298 if i2
== null then return null
1299 return v
.bool_instance
(i
.eq_is
(i2
))
1303 redef class AIntExpr
1306 return v
.int_instance
(self.value
.as(not null))
1310 redef class AFloatExpr
1313 return v
.float_instance
(self.value
.as(not null))
1317 redef class ACharExpr
1320 return v
.char_instance
(self.value
.as(not null))
1324 redef class AArrayExpr
1327 var val
= new Array[Instance]
1328 for nexpr
in self.n_exprs
.n_exprs
do
1329 var i
= v
.expr
(nexpr
)
1330 if i
== null then return null
1333 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1334 var elttype
= mtype
.arguments
.first
1335 return v
.array_instance
(val
, elttype
)
1339 redef class AStringFormExpr
1342 var txt
= self.value
.as(not null)
1343 var nat
= v
.native_string_instance
(txt
)
1344 var res
= new MutableInstance(v
.mainmodule
.get_primitive_class
("String").mclass_type
)
1345 v
.init_instance
(res
)
1346 v
.send
(v
.force_get_primitive_method
("from_cstring", res
.mtype
), [res
, nat
])
1347 v
.check_init_instance
(res
)
1352 redef class ASuperstringExpr
1355 var array
= new Array[Instance]
1356 for nexpr
in n_exprs
do
1357 var i
= v
.expr
(nexpr
)
1358 if i
== null then return null
1361 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1362 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1368 redef class ACrangeExpr
1371 var e1
= v
.expr
(self.n_expr
)
1372 if e1
== null then return null
1373 var e2
= v
.expr
(self.n_expr2
)
1374 if e2
== null then return null
1375 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1376 var res
= new MutableInstance(mtype
)
1377 v
.init_instance
(res
)
1378 v
.send
(v
.force_get_primitive_method
("init", mtype
), [res
, e1
, e2
])
1379 v
.check_init_instance
(res
)
1384 redef class AOrangeExpr
1387 var e1
= v
.expr
(self.n_expr
)
1388 if e1
== null then return null
1389 var e2
= v
.expr
(self.n_expr2
)
1390 if e2
== null then return null
1391 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1392 var res
= new MutableInstance(mtype
)
1393 v
.init_instance
(res
)
1394 v
.send
(v
.force_get_primitive_method
("without_last", mtype
), [res
, e1
, e2
])
1395 v
.check_init_instance
(res
)
1400 redef class ATrueExpr
1403 return v
.bool_instance
(true)
1407 redef class AFalseExpr
1410 return v
.bool_instance
(false)
1414 redef class ANullExpr
1417 return v
.null_instance
1421 redef class AIsaExpr
1424 var i
= v
.expr
(self.n_expr
)
1425 if i
== null then return null
1426 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1427 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1431 redef class AAsCastExpr
1434 var i
= v
.expr
(self.n_expr
)
1435 if i
== null then return null
1436 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1437 if not v
.is_subtype
(i
.mtype
, mtype
) then
1438 #fatal(v, "Cast failed expected {mtype}, got {i}")
1439 fatal
(v
, "Cast failed")
1445 redef class AAsNotnullExpr
1448 var i
= v
.expr
(self.n_expr
)
1449 if i
== null then return null
1450 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1451 if i
.mtype
isa MNullType then
1452 fatal
(v
, "Cast failed")
1458 redef class AParExpr
1461 return v
.expr
(self.n_expr
)
1465 redef class AOnceExpr
1468 if v
.onces
.has_key
(self) then
1469 return v
.onces
[self]
1471 var res
= v
.expr
(self.n_expr
)
1472 if res
== null then return null
1479 redef class ASendExpr
1482 var recv
= v
.expr
(self.n_expr
)
1483 if recv
== null then return null
1485 for a
in self.raw_arguments
.as(not null) do
1487 if i
== null then return null
1490 for c
in self.n_closure_defs
do
1491 var mtype
= c
.mclosure
.mtype
1492 var instance
= new ClosureInstance(mtype
, v
.frame
, c
)
1495 var mproperty
= self.mproperty
.as(not null)
1497 var res
= v
.send
(mproperty
, args
)
1498 if v
.is_break
(self.escapemark
) then
1500 v
.escapevalue
= null
1506 redef class ASendReassignFormExpr
1509 var recv
= v
.expr
(self.n_expr
)
1510 if recv
== null then return
1512 for a
in self.raw_arguments
.as(not null) do
1514 if i
== null then return
1517 var value
= v
.expr
(self.n_value
)
1518 if value
== null then return
1520 var mproperty
= self.mproperty
.as(not null)
1521 var read
= v
.send
(mproperty
, args
)
1524 var write
= v
.send
(self.reassign_property
.mproperty
, [read
, value
])
1525 assert write
!= null
1529 v
.send
(self.write_mproperty
.as(not null), args
)
1533 redef class ASuperExpr
1536 var recv
= v
.frame
.arguments
.first
1538 for a
in self.n_args
.n_exprs
do
1540 if i
== null then return null
1543 if args
.length
== 1 then
1544 args
= v
.frame
.arguments
1547 var mproperty
= self.mproperty
1548 if mproperty
!= null then
1549 if mproperty
.intro
.msignature
.arity
== 0 then
1553 var res
= v
.send
(mproperty
, args
)
1557 # stantard call-next-method
1558 var mpropdef
= v
.frame
.mpropdef
1559 # FIXME: we do not want an ugly static call!
1560 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1561 assert mpropdef
isa MMethodDef
1562 var res
= v
.call
(mpropdef
, args
)
1567 redef class ANewExpr
1570 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1571 var recv
: Instance = new MutableInstance(mtype
)
1572 v
.init_instance
(recv
)
1574 for a
in self.n_args
.n_exprs
do
1576 if i
== null then return null
1579 var mproperty
= self.mproperty
.as(not null)
1580 var res2
= v
.send
(mproperty
, args
)
1581 if res2
!= null then
1582 #self.debug("got {res2} from {mproperty}. drop {recv}")
1585 v
.check_init_instance
(recv
)
1590 redef class AAttrExpr
1593 var recv
= v
.expr
(self.n_expr
)
1594 if recv
== null then return null
1595 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1596 var mproperty
= self.mproperty
.as(not null)
1597 return v
.read_attribute
(mproperty
, recv
)
1601 redef class AAttrAssignExpr
1604 var recv
= v
.expr
(self.n_expr
)
1605 if recv
== null then return
1606 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1607 var i
= v
.expr
(self.n_value
)
1608 if i
== null then return
1609 var mproperty
= self.mproperty
.as(not null)
1610 assert recv
isa MutableInstance
1611 recv
.attributes
[mproperty
] = i
1615 redef class AAttrReassignExpr
1618 var recv
= v
.expr
(self.n_expr
)
1619 if recv
== null then return
1620 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1621 var value
= v
.expr
(self.n_value
)
1622 if value
== null then return
1623 var mproperty
= self.mproperty
.as(not null)
1624 var attr
= v
.read_attribute
(mproperty
, recv
)
1625 var res
= v
.send
(reassign_property
.mproperty
, [attr
, value
])
1627 assert recv
isa MutableInstance
1628 recv
.attributes
[mproperty
] = res
1632 redef class AIssetAttrExpr
1635 var recv
= v
.expr
(self.n_expr
)
1636 if recv
== null then return null
1637 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1638 var mproperty
= self.mproperty
.as(not null)
1639 assert recv
isa MutableInstance
1640 return v
.bool_instance
(recv
.attributes
.has_key
(mproperty
))
1644 redef class AClosureCallExpr
1647 var args
= new Array[Instance]
1648 for a
in self.n_args
.n_exprs
do
1650 if i
== null then return null
1653 var i
= v
.frame
.map
[self.variable
.as(not null)]
1654 assert i
isa ClosureInstance
1655 var res
= v
.call_closure
(i
, args
)
1660 redef class ADebugTypeExpr