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
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
: OptionBool = new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 init_naive_interpreter
(interpreter
, mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
55 private fun init_naive_interpreter
(interpreter
: NaiveInterpreter, mainmodule
: MModule) do
56 var sys_type
= mainmodule
.sys_type
57 if sys_type
== null then return # no class Sys
58 var mainobj
= new MutableInstance(sys_type
)
59 interpreter
.mainobj
= mainobj
60 interpreter
.init_instance
(mainobj
)
61 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
62 if initprop
!= null then
63 interpreter
.send
(initprop
, [mainobj
])
65 var mainprop
= mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
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 assert recv
isa MClassType
106 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
109 # Is a return executed?
110 # Set this mark to skip the evaluation until the end of the specified method frame
111 var returnmark
: nullable Frame = null
113 # Is a break executed?
114 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
115 var breakmark
: nullable EscapeMark = null
117 # Is a continue executed?
118 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
119 var continuemark
: nullable EscapeMark = null
121 # Is a return or a break or a continue executed?
122 # Use this function to know if you must skip the evaluation of statements
123 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
125 # The value associated with the current return/break/continue, if any.
126 # Set the value when you set a escapemark.
127 # Read the value when you catch a mark or reach the end of a method
128 var escapevalue
: nullable Instance = null
130 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
131 # If there is no break or if `escapemark` is null then return false.
132 # Use this function to catch a potential break.
133 fun is_break
(escapemark
: nullable EscapeMark): Bool
135 if escapemark
!= null and self.breakmark
== escapemark
then
136 self.breakmark
= null
143 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
144 # If there is no continue or if `escapemark` is null then return false.
145 # Use this function to catch a potential continue.
146 fun is_continue
(escapemark
: nullable EscapeMark): Bool
148 if escapemark
!= null and self.continuemark
== escapemark
then
149 self.continuemark
= null
156 # Evaluate `n` as an expression in the current context.
157 # Return the value of the expression.
158 # If `n` cannot be evaluated, then aborts.
159 fun expr
(n
: AExpr): nullable Instance
161 var frame
= self.frame
162 var old
= frame
.current_node
163 frame
.current_node
= n
164 #n.debug("IN Execute expr")
166 if i
== null and not self.is_escaping
then
167 n
.debug
("inconsitance: no value and not escaping.")
169 var implicit_cast_to
= n
.implicit_cast_to
170 if implicit_cast_to
!= null then
171 var mtype
= self.unanchor_type
(implicit_cast_to
)
172 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
175 #n.debug("OUT Execute expr: value is {i}")
176 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
177 frame
.current_node
= old
181 # Evaluate `n` as a statement in the current context.
182 # Do nothing if `n` is null.
183 # If `n` cannot be evaluated, then aborts.
184 fun stmt
(n
: nullable AExpr)
187 var frame
= self.frame
188 var old
= frame
.current_node
189 frame
.current_node
= n
190 #n.debug("Execute stmt")
192 frame
.current_node
= old
196 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
197 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
199 # Return the boolean instance associated with `val`.
200 fun bool_instance
(val
: Bool): Instance
202 if val
then return self.true_instance
else return self.false_instance
205 # Return the integer instance associated with `val`.
206 fun int_instance
(val
: Int): Instance
208 var ic
= self.mainmodule
.get_primitive_class
("Int")
209 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
212 # Return the char instance associated with `val`.
213 fun char_instance
(val
: Char): Instance
215 var ic
= self.mainmodule
.get_primitive_class
("Char")
216 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
219 # Return the float instance associated with `val`.
220 fun float_instance
(val
: Float): Instance
222 var ic
= self.mainmodule
.get_primitive_class
("Float")
223 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
226 # The unique intance of the `true` value.
227 var true_instance
: Instance
229 # The unique intance of the `false` value.
230 var false_instance
: Instance
232 # The unique intance of the `null` value.
233 var null_instance
: Instance
235 # Return a new array made of `values`.
236 # The dynamic type of the result is Array[elttype].
237 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
239 assert not elttype
.need_anchor
240 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
241 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
242 var res
= new MutableInstance(mtype
)
243 self.init_instance
(res
)
244 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
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 # Common code for calls to injected methods and normal methods
300 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
302 var vararg_rank
= mpropdef
.msignature
.vararg_rank
303 if vararg_rank
>= 0 then
304 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
306 args
= new Array[Instance]
308 args
.add
(rawargs
.first
) # recv
310 for i
in [0..vararg_rank
[ do
311 args
.add
(rawargs
[i
+1])
314 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
315 var vararg
= new Array[Instance]
316 for i
in [vararg_rank
..vararg_lastrank
] do
317 vararg
.add
(rawargs
[i
+1])
319 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
320 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
321 args
.add
(self.array_instance
(vararg
, elttype
))
323 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
324 args
.add
(rawargs
[i
+1])
330 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
331 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
332 # The call is direct/static. There is no message-seding/late-binding.
333 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
335 args
= call_commons
(mpropdef
, args
)
336 return call_without_varargs
(mpropdef
, args
)
339 # Common code to call and this function
341 # Call only executes the variadic part, this avoids
342 # double encapsulation of variadic parameters into an Array
343 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
345 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
346 self.discover_call_trace
.add mpropdef
347 self.debug
("Discovered {mpropdef}")
349 if args
.length
< mpropdef
.msignature
.arity
+ 1 or args
.length
> mpropdef
.msignature
.arity
+ 1 then
350 fatal
("NOT YET IMPLEMENTED: Invalid arity for {mpropdef}. {args.length} arguments given.")
353 # Look for the AST node that implements the property
354 var mproperty
= mpropdef
.mproperty
355 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
356 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
357 self.parameter_check
(npropdef
, mpropdef
, args
)
358 return npropdef
.call
(self, mpropdef
, args
)
359 else if mproperty
.name
== "init" then
360 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
361 self.parameter_check
(nclassdef
, mpropdef
, args
)
362 return nclassdef
.call
(self, mpropdef
, args
)
364 fatal
("Fatal Error: method {mpropdef} not found in the AST")
369 # Generate type checks in the C code to check covariant parameters
370 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
372 var msignature
= mpropdef
.msignature
373 for i
in [0..msignature
.arity
[ do
374 # skip test for vararg since the array is instantiated with the correct polymorphic type
375 if msignature
.vararg_rank
== i
then continue
377 # skip if the cast is not required
378 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
379 if not origmtype
.need_anchor
then continue
381 # get the parameter type
382 var mtype
= msignature
.mparameters
[i
].mtype
383 var anchor
= args
.first
.mtype
.as(MClassType)
384 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
385 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
386 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
391 # Common code for runtime injected calls and normal calls
392 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
394 if mtype
isa MNullType then
395 if mproperty
.name
== "==" then
396 return self.bool_instance
(args
[0] == args
[1])
397 else if mproperty
.name
== "!=" then
398 return self.bool_instance
(args
[0] != args
[1])
400 #fatal("Reciever is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
401 fatal
("Reciever is null")
406 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
407 # Return a falue if `mproperty` is a function, or null if it is a procedure.
408 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
409 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
411 var recv
= args
.first
412 var mtype
= recv
.mtype
413 var ret
= send_commons
(mproperty
, args
, mtype
)
414 if ret
!= null then return ret
415 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
416 return self.call
(propdef
, args
)
419 # Read the attribute `mproperty` of an instance `recv` and return its value.
420 # If the attribute in not yet initialized, then aborts with an error message.
421 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
423 assert recv
isa MutableInstance
424 if not recv
.attributes
.has_key
(mproperty
) then
425 fatal
("Uninitialized attribute {mproperty.name}")
428 return recv
.attributes
[mproperty
]
431 # Collect attributes of a type in the order of their init
432 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
434 var cache
= self.collect_attr_propdef_cache
435 if cache
.has_key
(mtype
) then return cache
[mtype
]
437 var res
= new Array[AAttrPropdef]
438 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
439 self.mainmodule
.linearize_mclassdefs
(cds
)
441 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
442 for npropdef
in n
.n_propdefs
do
443 if npropdef
isa AAttrPropdef then
453 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
455 # Fill the initial values of the newly created instance `recv`.
456 # `recv.mtype` is used to know what must be filled.
457 fun init_instance
(recv
: Instance)
459 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
460 npropdef
.init_expr
(self, recv
)
464 # This function determine the correct type according the reciever of the current definition (self).
465 fun unanchor_type
(mtype
: MType): MType
467 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
471 # An instance represents a value of the executed program.
472 abstract class Instance
473 # The dynamic type of the instance
474 # ASSERT: not self.mtype.is_anchored
477 # return true if the instance is the true value.
478 # return false if the instance is the true value.
480 fun is_true
: Bool do abort
482 # Return true if `self` IS `o` (using the Nit semantic of is)
483 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
485 # Human readable object identity "Type#number"
486 redef fun to_s
do return "{mtype}"
488 # Return the integer value if the instance is an integer.
490 fun to_i
: Int do abort
492 # Return the integer value if the instance is a float.
494 fun to_f
: Float do abort
496 # The real value encapsulated if the instance is primitive.
498 fun val
: Object do abort
501 # A instance with attribute (standards objects)
502 class MutableInstance
505 # The values of the attributes
506 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
509 # Special instance to handle primitives values (int, bool, etc.)
510 # The trick it just to encapsulate the <<real>> value
511 class PrimitiveInstance[E
: Object]
514 # The real value encapsulated
517 init(mtype
: MType, val
: E
)
525 if val
== true then return true
526 if val
== false then return false
532 if not o
isa PrimitiveInstance[Object] then return false
533 return self.val
== o
.val
538 if not o
isa PrimitiveInstance[Object] then return false
539 return self.val
.is_same_instance
(o
.val
)
542 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
544 redef fun to_i
do return val
.as(Int)
546 redef fun to_f
do return val
.as(Float)
549 # Information about local variables in a running method
551 # The current visited node
552 # The node is stored by frame to keep a stack trace
553 var current_node
: ANode
554 # The executed property.
555 # A Method in case of a call, an attribute in case of a default initialization.
556 var mpropdef
: MPropDef
557 # Arguments of the method (the first is te receiver
558 var arguments
: Array[Instance]
559 # Mapping betwen a variable an the current value
560 var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
564 # Aborts the program with a message
565 # `v` is used to know if a colored message is displayed or not
566 private fun fatal
(v
: NaiveInterpreter, message
: String)
568 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
569 stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
571 stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
572 stderr
.write
(v
.stack_trace
)
580 # Execute a `mpropdef` associated with the current node.
581 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
583 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
588 redef class AConcreteMethPropdef
590 redef fun call
(v
, mpropdef
, args
)
592 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
593 call_commons
(v
, mpropdef
, args
, f
)
595 if v
.returnmark
== f
then
597 var res
= v
.escapevalue
604 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance], f
: Frame)
606 for i
in [0..mpropdef
.msignature
.arity
[ do
607 var variable
= self.n_signature
.n_params
[i
].variable
608 assert variable
!= null
609 f
.map
[variable
] = args
[i
+1]
614 # Call the implicit super-init
615 var auto_super_inits
= self.auto_super_inits
616 if auto_super_inits
!= null then
617 var selfarg
= [args
.first
]
618 for auto_super_init
in auto_super_inits
do
619 if auto_super_init
.intro
.msignature
.arity
== 0 then
620 v
.send
(auto_super_init
, selfarg
)
622 v
.send
(auto_super_init
, args
)
631 redef class AInternMethPropdef
632 redef fun call
(v
, mpropdef
, args
)
634 var pname
= mpropdef
.mproperty
.name
635 var cname
= mpropdef
.mclassdef
.mclass
.name
636 if pname
== "output" then
637 var recv
= args
.first
640 else if pname
== "object_id" then
641 var recv
= args
.first
642 if recv
isa PrimitiveInstance[Object] then
643 return v
.int_instance
(recv
.val
.object_id
)
645 return v
.int_instance
(recv
.object_id
)
647 else if pname
== "output_class_name" then
648 var recv
= args
.first
651 else if pname
== "native_class_name" then
652 var recv
= args
.first
653 var txt
= recv
.mtype
.to_s
654 return v
.native_string_instance
(txt
)
655 else if pname
== "==" then
656 # == is correclt redefined for instances
657 return v
.bool_instance
(args
[0] == args
[1])
658 else if pname
== "!=" then
659 return v
.bool_instance
(args
[0] != args
[1])
660 else if pname
== "is_same_type" then
661 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
662 else if pname
== "is_same_instance" then
663 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
664 else if pname
== "exit" then
667 else if pname
== "sys" then
669 else if cname
== "Int" then
670 if pname
== "unary -" then
671 return v
.int_instance
(-args
[0].to_i
)
672 else if pname
== "succ" then
673 return v
.int_instance
(args
[0].to_i
+ 1)
674 else if pname
== "prec" then
675 return v
.int_instance
(args
[0].to_i
- 1)
676 else if pname
== "+" then
677 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
678 else if pname
== "-" then
679 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
680 else if pname
== "*" then
681 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
682 else if pname
== "%" then
683 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
684 else if pname
== "/" then
685 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
686 else if pname
== "<" then
687 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
688 else if pname
== ">" then
689 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
690 else if pname
== "<=" then
691 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
692 else if pname
== ">=" then
693 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
694 else if pname
== "<=>" then
695 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
696 else if pname
== "ascii" then
697 return v
.char_instance
(args
[0].to_i
.ascii
)
698 else if pname
== "to_f" then
699 return v
.float_instance
(args
[0].to_i
.to_f
)
700 else if pname
== "lshift" then
701 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
702 else if pname
== "rshift" then
703 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
705 else if cname
== "Char" then
706 var recv
= args
[0].val
.as(Char)
707 if pname
== "ascii" then
708 return v
.int_instance
(recv
.ascii
)
709 else if pname
== "succ" then
710 return v
.char_instance
(recv
.succ
)
711 else if pname
== "prec" then
712 return v
.char_instance
(recv
.prec
)
713 else if pname
== "<" then
714 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
715 else if pname
== ">" then
716 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
717 else if pname
== "<=" then
718 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
719 else if pname
== ">=" then
720 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
721 else if pname
== "<=>" then
722 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
724 else if cname
== "Float" then
725 var recv
= args
[0].to_f
726 if pname
== "unary -" then
727 return v
.float_instance
(-recv
)
728 else if pname
== "+" then
729 return v
.float_instance
(recv
+ args
[1].to_f
)
730 else if pname
== "-" then
731 return v
.float_instance
(recv
- args
[1].to_f
)
732 else if pname
== "*" then
733 return v
.float_instance
(recv
* args
[1].to_f
)
734 else if pname
== "/" then
735 return v
.float_instance
(recv
/ args
[1].to_f
)
736 else if pname
== "<" then
737 return v
.bool_instance
(recv
< args
[1].to_f
)
738 else if pname
== ">" then
739 return v
.bool_instance
(recv
> args
[1].to_f
)
740 else if pname
== "<=" then
741 return v
.bool_instance
(recv
<= args
[1].to_f
)
742 else if pname
== ">=" then
743 return v
.bool_instance
(recv
>= args
[1].to_f
)
744 else if pname
== "to_i" then
745 return v
.int_instance
(recv
.to_i
)
747 else if cname
== "NativeString" then
748 var recvval
= args
.first
.val
.as(Buffer)
749 if pname
== "[]" then
750 var arg1
= args
[1].to_i
751 if arg1
>= recvval
.length
or arg1
< 0 then
752 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
754 return v
.char_instance
(recvval
[arg1
])
755 else if pname
== "[]=" then
756 var arg1
= args
[1].to_i
757 if arg1
>= recvval
.length
or arg1
< 0 then
758 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
760 recvval
[arg1
] = args
[2].val
.as(Char)
762 else if pname
== "copy_to" then
763 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
764 var destval
= args
[1].val
.as(Buffer)
765 var lenval
= args
[2].to_i
766 var fromval
= args
[3].to_i
767 var toval
= args
[4].to_i
769 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
771 if fromval
+ lenval
>= recvval
.length
then
772 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
775 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
777 if toval
+ lenval
>= destval
.length
then
778 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
780 recvval
.copy
(fromval
, lenval
, destval
, toval
)
782 else if pname
== "atoi" then
783 return v
.int_instance
(recvval
.to_i
)
785 else if pname
== "calloc_string" then
786 return v
.native_string_instance
("!" * args
[1].to_i
)
787 else if cname
== "NativeArray" then
788 var recvval
= args
.first
.val
.as(Array[Instance])
789 if pname
== "[]" then
790 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
791 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
793 return recvval
[args
[1].to_i
]
794 else if pname
== "[]=" then
795 recvval
[args
[1].to_i
] = args
[2]
797 else if pname
== "copy_to" then
798 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
801 else if pname
== "calloc_array" then
802 var recvtype
= args
.first
.mtype
.as(MClassType)
804 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
805 mtype
= mtype
.arguments
.first
806 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
807 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
808 else if pname
== "native_argc" then
809 return v
.int_instance
(v
.arguments
.length
)
810 else if pname
== "native_argv" then
811 var txt
= v
.arguments
[args
[1].to_i
]
812 return v
.native_string_instance
(txt
)
814 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
819 redef class AbstractArray[E
]
820 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
822 self.copy_to
(start
, len
, dest
, new_start
)
826 redef class AExternInitPropdef
827 redef fun call
(v
, mpropdef
, args
)
829 var pname
= mpropdef
.mproperty
.name
830 var cname
= mpropdef
.mclassdef
.mclass
.name
831 if pname
== "native_stdout" then
832 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdout
)
833 else if pname
== "native_stdin" then
834 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdin
)
835 else if pname
== "native_stderr" then
836 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stderr
)
837 else if pname
== "io_open_read" then
838 var a1
= args
[1].val
.as(Buffer)
839 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
840 else if pname
== "io_open_write" then
841 var a1
= args
[1].val
.as(Buffer)
842 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
844 fatal
(v
, "NOT YET IMPLEMENTED extern init {mpropdef}")
849 redef class AExternMethPropdef
851 redef fun call
(v
, mpropdef
, args
)
853 var pname
= mpropdef
.mproperty
.name
854 var cname
= mpropdef
.mclassdef
.mclass
.name
855 if cname
== "Int" then
856 var recvval
= args
.first
.val
.as(Int)
857 if pname
== "rand" then
858 var res
= recvval
.rand
859 return v
.int_instance
(res
)
860 else if pname
== "native_int_to_s" then
861 return v
.native_string_instance
(recvval
.to_s
)
863 else if cname
== "NativeFile" then
864 var recvval
= args
.first
.val
865 if pname
== "io_write" then
866 var a1
= args
[1].val
.as(Buffer)
867 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
))
869 else if pname
== "io_read" then
870 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
871 var a1
= args
[1].val
.as(Buffer)
872 new Buffer.from
(str
).copy
(0, str
.length
, a1
, 0)
873 return v
.int_instance
(str
.length
)
874 else if pname
== "io_close" then
875 recvval
.as(IOS).close
876 return v
.int_instance
(0)
878 else if cname
== "NativeString" then
879 var recvval
= args
.first
.val
.as(Buffer)
880 if pname
== "file_exists" then
881 return v
.bool_instance
(recvval
.to_s
.file_exists
)
882 else if pname
== "file_mkdir" then
885 else if pname
== "file_chdir" then
888 else if pname
== "file_realpath" then
889 return v
.native_string_instance
(recvval
.to_s
.realpath
)
890 else if pname
== "get_environ" then
891 var txt
= recvval
.to_s
.environ
892 return v
.native_string_instance
(txt
)
893 else if pname
== "system" then
894 var res
= sys
.system
(recvval
.to_s
)
895 return v
.int_instance
(res
)
896 else if pname
== "atof" then
897 return v
.float_instance
(recvval
.to_f
)
899 else if cname
== "Int" then
900 if pname
== "rand" then
901 return v
.int_instance
(args
[0].to_i
.rand
)
903 else if cname
== "Float" then
904 if pname
== "cos" then
905 return v
.float_instance
(args
[0].to_f
.cos
)
906 else if pname
== "sin" then
907 return v
.float_instance
(args
[0].to_f
.sin
)
908 else if pname
== "tan" then
909 return v
.float_instance
(args
[0].to_f
.tan
)
910 else if pname
== "acos" then
911 return v
.float_instance
(args
[0].to_f
.acos
)
912 else if pname
== "asin" then
913 return v
.float_instance
(args
[0].to_f
.asin
)
914 else if pname
== "atan" then
915 return v
.float_instance
(args
[0].to_f
.atan
)
916 else if pname
== "sqrt" then
917 return v
.float_instance
(args
[0].to_f
.sqrt
)
918 else if pname
== "exp" then
919 return v
.float_instance
(args
[0].to_f
.exp
)
920 else if pname
== "log" then
921 return v
.float_instance
(args
[0].to_f
.log
)
922 else if pname
== "pow" then
923 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
924 else if pname
== "rand" then
925 return v
.float_instance
(args
[0].to_f
.rand
)
927 else if pname
== "native_argc" then
928 return v
.int_instance
(v
.arguments
.length
)
929 else if pname
== "native_argv" then
930 var txt
= v
.arguments
[args
[1].to_i
]
931 return v
.native_string_instance
(txt
)
932 else if pname
== "get_time" then
933 return v
.int_instance
(get_time
)
934 else if pname
== "srand_from" then
935 srand_from
(args
[1].to_i
)
937 else if pname
== "atan2" then
938 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
939 else if pname
== "pi" then
940 return v
.float_instance
(pi
)
941 else if pname
== "lexer_goto" then
942 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
943 else if pname
== "lexer_accept" then
944 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
945 else if pname
== "parser_goto" then
946 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
947 else if pname
== "parser_action" then
948 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
949 else if pname
== "file_getcwd" then
950 return v
.native_string_instance
(getcwd
)
952 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
957 redef class AAttrPropdef
958 redef fun call
(v
, mpropdef
, args
)
960 var recv
= args
.first
961 assert recv
isa MutableInstance
962 var attr
= self.mpropdef
.mproperty
963 if args
.length
== 1 then
964 return v
.read_attribute
(attr
, recv
)
966 assert args
.length
== 2
967 recv
.attributes
[attr
] = args
[1]
972 # Evaluate and set the default value of the attribute in `recv`
973 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
975 assert recv
isa MutableInstance
976 var nexpr
= self.n_expr
977 if nexpr
!= null then
978 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
980 var val
= v
.expr
(nexpr
)
983 assert not v
.is_escaping
984 recv
.attributes
[self.mpropdef
.mproperty
] = val
987 var mtype
= self.mpropdef
.static_mtype
.as(not null)
988 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
989 if mtype
isa MNullableType then
990 recv
.attributes
[self.mpropdef
.mproperty
] = v
.null_instance
995 redef class ADeferredMethPropdef
996 redef fun call
(v
, mpropdef
, args
)
998 fatal
(v
, "Abstract method `{mpropdef.mproperty.name}` called on `{args.first.mtype}`")
1003 redef class AClassdef
1004 # Execute an implicit `mpropdef` associated with the current node.
1005 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1007 var super_inits
= self.super_inits
1008 if super_inits
!= null then
1009 assert args
.length
== 1
1010 for su
in super_inits
do
1015 var recv
= args
.first
1016 assert recv
isa MutableInstance
1018 # Collect undefined attributes
1019 for npropdef
in self.n_propdefs
do
1020 if npropdef
isa AAttrPropdef and npropdef
.n_expr
== null then
1021 recv
.attributes
[npropdef
.mpropdef
.mproperty
] = args
[i
]
1030 # Evaluate the node as a possible expression.
1031 # Return a possible value
1032 # NOTE: Do not call this method directly, but use `v.expr`
1033 # This method is here to be implemented by subclasses.
1034 private fun expr
(v
: NaiveInterpreter): nullable Instance
1036 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1040 # Evaluate the node as a statement.
1041 # NOTE: Do not call this method directly, but use `v.stmt`
1042 # This method is here to be implemented by subclasses (no need to return something).
1043 private fun stmt
(v
: NaiveInterpreter)
1050 redef class ABlockExpr
1053 var last
= self.n_expr
.last
1054 for e
in self.n_expr
do
1055 if e
== last
then break
1057 if v
.is_escaping
then return null
1064 for e
in self.n_expr
do
1066 if v
.is_escaping
then return
1071 redef class AVardeclExpr
1074 var ne
= self.n_expr
1077 if i
== null then return
1078 v
.frame
.map
[self.variable
.as(not null)] = i
1083 redef class AVarExpr
1086 return v
.frame
.map
[self.variable
.as(not null)]
1090 redef class AVarAssignExpr
1093 var i
= v
.expr
(self.n_value
)
1094 if i
== null then return null
1095 v
.frame
.map
[self.variable
.as(not null)] = i
1100 redef class AVarReassignExpr
1103 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1104 var value
= v
.expr
(self.n_value
)
1105 if value
== null then return
1106 var res
= v
.send
(reassign_property
.mproperty
, [vari
, value
])
1108 v
.frame
.map
[self.variable
.as(not null)] = res
1112 redef class ASelfExpr
1115 return v
.frame
.arguments
.first
1119 redef class AContinueExpr
1122 var ne
= self.n_expr
1125 if i
== null then return
1128 v
.continuemark
= self.escapemark
1132 redef class ABreakExpr
1135 var ne
= self.n_expr
1138 if i
== null then return
1141 v
.breakmark
= self.escapemark
1145 redef class AReturnExpr
1148 var ne
= self.n_expr
1151 if i
== null then return
1154 v
.returnmark
= v
.frame
1158 redef class AAbortExpr
1169 var cond
= v
.expr
(self.n_expr
)
1170 if cond
== null then return null
1171 if cond
.is_true
then
1172 return v
.expr
(self.n_then
.as(not null))
1174 return v
.expr
(self.n_else
.as(not null))
1180 var cond
= v
.expr
(self.n_expr
)
1181 if cond
== null then return
1182 if cond
.is_true
then
1190 redef class AIfexprExpr
1193 var cond
= v
.expr
(self.n_expr
)
1194 if cond
== null then return null
1195 if cond
.is_true
then
1196 return v
.expr
(self.n_then
)
1198 return v
.expr
(self.n_else
)
1206 v
.stmt
(self.n_block
)
1207 v
.is_break
(self.escapemark
) # Clear the break (if any)
1211 redef class AWhileExpr
1215 var cond
= v
.expr
(self.n_expr
)
1216 if cond
== null then return
1217 if not cond
.is_true
then return
1218 v
.stmt
(self.n_block
)
1219 if v
.is_break
(self.escapemark
) then return
1220 v
.is_continue
(self.escapemark
) # Clear the break
1221 if v
.is_escaping
then return
1226 redef class ALoopExpr
1230 v
.stmt
(self.n_block
)
1231 if v
.is_break
(self.escapemark
) then return
1232 v
.is_continue
(self.escapemark
) # Clear the break
1233 if v
.is_escaping
then return
1238 redef class AForExpr
1241 var col
= v
.expr
(self.n_expr
)
1242 if col
== null then return
1243 #self.debug("col {col}")
1244 var iter
= v
.send
(v
.force_get_primitive_method
("iterator", col
.mtype
), [col
]).as(not null)
1245 #self.debug("iter {iter}")
1247 var isok
= v
.send
(v
.force_get_primitive_method
("is_ok", iter
.mtype
), [iter
]).as(not null)
1248 if not isok
.is_true
then return
1249 if self.variables
.length
== 1 then
1250 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1251 #self.debug("item {item}")
1252 v
.frame
.map
[self.variables
.first
] = item
1253 else if self.variables
.length
== 2 then
1254 var key
= v
.send
(v
.force_get_primitive_method
("key", iter
.mtype
), [iter
]).as(not null)
1255 v
.frame
.map
[self.variables
[0]] = key
1256 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1257 v
.frame
.map
[self.variables
[1]] = item
1261 v
.stmt
(self.n_block
)
1262 if v
.is_break
(self.escapemark
) then return
1263 v
.is_continue
(self.escapemark
) # Clear the break
1264 if v
.is_escaping
then return
1265 v
.send
(v
.force_get_primitive_method
("next", iter
.mtype
), [iter
])
1270 redef class AAssertExpr
1273 var cond
= v
.expr
(self.n_expr
)
1274 if cond
== null then return
1275 if not cond
.is_true
then
1277 if v
.is_escaping
then return
1280 fatal
(v
, "Assert '{nid.text}' failed")
1282 fatal
(v
, "Assert failed")
1292 var cond
= v
.expr
(self.n_expr
)
1293 if cond
== null then return null
1294 if cond
.is_true
then return cond
1295 return v
.expr
(self.n_expr2
)
1299 redef class AImpliesExpr
1302 var cond
= v
.expr
(self.n_expr
)
1303 if cond
== null then return null
1304 if not cond
.is_true
then return v
.true_instance
1305 return v
.expr
(self.n_expr2
)
1309 redef class AAndExpr
1312 var cond
= v
.expr
(self.n_expr
)
1313 if cond
== null then return null
1314 if not cond
.is_true
then return cond
1315 return v
.expr
(self.n_expr2
)
1319 redef class ANotExpr
1322 var cond
= v
.expr
(self.n_expr
)
1323 if cond
== null then return null
1324 return v
.bool_instance
(not cond
.is_true
)
1328 redef class AOrElseExpr
1331 var i
= v
.expr
(self.n_expr
)
1332 if i
== null then return null
1333 if i
!= v
.null_instance
then return i
1334 return v
.expr
(self.n_expr2
)
1338 redef class AIntExpr
1341 return v
.int_instance
(self.value
.as(not null))
1345 redef class AFloatExpr
1348 return v
.float_instance
(self.value
.as(not null))
1352 redef class ACharExpr
1355 return v
.char_instance
(self.value
.as(not null))
1359 redef class AArrayExpr
1362 var val
= new Array[Instance]
1363 for nexpr
in self.n_exprs
.n_exprs
do
1364 var i
= v
.expr
(nexpr
)
1365 if i
== null then return null
1368 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1369 var elttype
= mtype
.arguments
.first
1370 return v
.array_instance
(val
, elttype
)
1374 redef class AStringFormExpr
1377 var txt
= self.value
.as(not null)
1378 var nat
= v
.native_string_instance
(txt
)
1379 var res
= v
.send
(v
.force_get_primitive_method
("to_s", nat
.mtype
), [nat
]).as(not null)
1384 redef class ASuperstringExpr
1387 var array
= new Array[Instance]
1388 for nexpr
in n_exprs
do
1389 var i
= v
.expr
(nexpr
)
1390 if i
== null then return null
1393 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1394 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1400 redef class ACrangeExpr
1403 var e1
= v
.expr
(self.n_expr
)
1404 if e1
== null then return null
1405 var e2
= v
.expr
(self.n_expr2
)
1406 if e2
== null then return null
1407 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1408 var res
= new MutableInstance(mtype
)
1409 v
.init_instance
(res
)
1410 v
.send
(v
.force_get_primitive_method
("init", mtype
), [res
, e1
, e2
])
1415 redef class AOrangeExpr
1418 var e1
= v
.expr
(self.n_expr
)
1419 if e1
== null then return null
1420 var e2
= v
.expr
(self.n_expr2
)
1421 if e2
== null then return null
1422 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1423 var res
= new MutableInstance(mtype
)
1424 v
.init_instance
(res
)
1425 v
.send
(v
.force_get_primitive_method
("without_last", mtype
), [res
, e1
, e2
])
1430 redef class ATrueExpr
1433 return v
.bool_instance
(true)
1437 redef class AFalseExpr
1440 return v
.bool_instance
(false)
1444 redef class ANullExpr
1447 return v
.null_instance
1451 redef class AIsaExpr
1454 var i
= v
.expr
(self.n_expr
)
1455 if i
== null then return null
1456 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1457 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1461 redef class AAsCastExpr
1464 var i
= v
.expr
(self.n_expr
)
1465 if i
== null then return null
1466 var mtype
= self.mtype
.as(not null)
1467 var amtype
= v
.unanchor_type
(mtype
)
1468 if not v
.is_subtype
(i
.mtype
, amtype
) then
1469 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1475 redef class AAsNotnullExpr
1478 var i
= v
.expr
(self.n_expr
)
1479 if i
== null then return null
1480 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1481 if i
.mtype
isa MNullType then
1482 fatal
(v
, "Cast failed")
1488 redef class AParExpr
1491 return v
.expr
(self.n_expr
)
1495 redef class AOnceExpr
1498 if v
.onces
.has_key
(self) then
1499 return v
.onces
[self]
1501 var res
= v
.expr
(self.n_expr
)
1502 if res
== null then return null
1509 redef class ASendExpr
1512 var recv
= v
.expr
(self.n_expr
)
1513 if recv
== null then return null
1515 for a
in self.raw_arguments
.as(not null) do
1517 if i
== null then return null
1520 var mproperty
= self.mproperty
.as(not null)
1522 var res
= v
.send
(mproperty
, args
)
1527 redef class ASendReassignFormExpr
1530 var recv
= v
.expr
(self.n_expr
)
1531 if recv
== null then return
1533 for a
in self.raw_arguments
.as(not null) do
1535 if i
== null then return
1538 var value
= v
.expr
(self.n_value
)
1539 if value
== null then return
1541 var mproperty
= self.mproperty
.as(not null)
1542 var read
= v
.send
(mproperty
, args
)
1545 var write
= v
.send
(self.reassign_property
.mproperty
, [read
, value
])
1546 assert write
!= null
1550 v
.send
(self.write_mproperty
.as(not null), args
)
1554 redef class ASuperExpr
1557 var recv
= v
.frame
.arguments
.first
1559 for a
in self.n_args
.n_exprs
do
1561 if i
== null then return null
1564 if args
.length
== 1 then
1565 args
= v
.frame
.arguments
1568 var mproperty
= self.mproperty
1569 if mproperty
!= null then
1570 if mproperty
.intro
.msignature
.arity
== 0 then
1574 var res
= v
.send
(mproperty
, args
)
1578 # stantard call-next-method
1579 var mpropdef
= v
.frame
.mpropdef
1580 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1581 assert mpropdef
isa MMethodDef
1582 var res
= v
.call_without_varargs
(mpropdef
, args
)
1587 redef class ANewExpr
1590 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1591 var recv
: Instance = new MutableInstance(mtype
)
1592 v
.init_instance
(recv
)
1594 for a
in self.n_args
.n_exprs
do
1596 if i
== null then return null
1599 var mproperty
= self.mproperty
.as(not null)
1600 var res2
= v
.send
(mproperty
, args
)
1601 if res2
!= null then
1602 #self.debug("got {res2} from {mproperty}. drop {recv}")
1609 redef class AAttrExpr
1612 var recv
= v
.expr
(self.n_expr
)
1613 if recv
== null then return null
1614 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1615 var mproperty
= self.mproperty
.as(not null)
1616 return v
.read_attribute
(mproperty
, recv
)
1620 redef class AAttrAssignExpr
1623 var recv
= v
.expr
(self.n_expr
)
1624 if recv
== null then return
1625 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1626 var i
= v
.expr
(self.n_value
)
1627 if i
== null then return
1628 var mproperty
= self.mproperty
.as(not null)
1629 assert recv
isa MutableInstance
1630 recv
.attributes
[mproperty
] = i
1634 redef class AAttrReassignExpr
1637 var recv
= v
.expr
(self.n_expr
)
1638 if recv
== null then return
1639 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1640 var value
= v
.expr
(self.n_value
)
1641 if value
== null then return
1642 var mproperty
= self.mproperty
.as(not null)
1643 var attr
= v
.read_attribute
(mproperty
, recv
)
1644 var res
= v
.send
(reassign_property
.mproperty
, [attr
, value
])
1646 assert recv
isa MutableInstance
1647 recv
.attributes
[mproperty
] = res
1651 redef class AIssetAttrExpr
1654 var recv
= v
.expr
(self.n_expr
)
1655 if recv
== null then return null
1656 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1657 var mproperty
= self.mproperty
.as(not null)
1658 assert recv
isa MutableInstance
1659 return v
.bool_instance
(recv
.attributes
.has_key
(mproperty
))
1663 redef class ADebugTypeExpr