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
26 redef class ToolContext
27 # --discover-call-trace
28 var opt_discover_call_trace
: OptionBool = new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
33 self.option_context
.add_option
(self.opt_discover_call_trace
)
37 redef class ModelBuilder
38 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
39 # `arguments` are the command-line arguments in order
41 # 1. the AST is fully loaded.
42 # 2. the model is fully built.
43 # 3. the instructions are fully analysed.
44 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
47 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
49 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
50 init_naive_interpreter
(interpreter
, mainmodule
)
53 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 private fun init_naive_interpreter
(interpreter
: NaiveInterpreter, mainmodule
: MModule) do
57 var sys_type
= mainmodule
.sys_type
58 if sys_type
== null then return # no class Sys
59 var mainobj
= new MutableInstance(sys_type
)
60 interpreter
.mainobj
= mainobj
61 interpreter
.init_instance
(mainobj
)
62 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
63 if initprop
!= null then
64 interpreter
.send
(initprop
, [mainobj
])
66 var mainprop
= mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
67 if mainprop
!= null then
68 interpreter
.send
(mainprop
, [mainobj
])
73 # The visitor that interprets the Nit Program by walking on the AST
74 private class NaiveInterpreter
75 # The modelbuilder that know the AST and its associations with the model
76 var modelbuilder
: ModelBuilder
78 # The main moduleof the program (used to lookup methoda
79 var mainmodule
: MModule
81 # The command line arguments of the interpreted program
82 # arguments.first is the program name
83 # arguments[1] is the first argument
84 var arguments
: Array[String]
86 var mainobj
: nullable Instance
88 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
90 self.modelbuilder
= modelbuilder
91 self.mainmodule
= mainmodule
92 self.arguments
= arguments
93 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
94 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
95 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
98 # Subtype test in the context of the mainmodule
99 fun is_subtype
(sub
, sup
: MType): Bool
101 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
104 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
106 assert recv
isa MClassType
107 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
110 # Is a return executed?
111 # Set this mark to skip the evaluation until the end of the specified method frame
112 var returnmark
: nullable Frame = null
114 # Is a break executed?
115 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
116 var breakmark
: nullable EscapeMark = null
118 # Is a continue executed?
119 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
120 var continuemark
: nullable EscapeMark = null
122 # Is a return or a break or a continue executed?
123 # Use this function to know if you must skip the evaluation of statements
124 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
126 # The value associated with the current return/break/continue, if any.
127 # Set the value when you set a escapemark.
128 # Read the value when you catch a mark or reach the end of a method
129 var escapevalue
: nullable Instance = null
131 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
132 # If there is no break or if `escapemark` is null then return false.
133 # Use this function to catch a potential break.
134 fun is_break
(escapemark
: nullable EscapeMark): Bool
136 if escapemark
!= null and self.breakmark
== escapemark
then
137 self.breakmark
= null
144 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
145 # If there is no continue or if `escapemark` is null then return false.
146 # Use this function to catch a potential continue.
147 fun is_continue
(escapemark
: nullable EscapeMark): Bool
149 if escapemark
!= null and self.continuemark
== escapemark
then
150 self.continuemark
= null
157 # Evaluate `n` as an expression in the current context.
158 # Return the value of the expression.
159 # If `n` cannot be evaluated, then aborts.
160 fun expr
(n
: AExpr): nullable Instance
162 var frame
= self.frame
163 var old
= frame
.current_node
164 frame
.current_node
= n
165 #n.debug("IN Execute expr")
167 if i
== null and not self.is_escaping
then
168 n
.debug
("inconsitance: no value and not escaping.")
170 var implicit_cast_to
= n
.implicit_cast_to
171 if implicit_cast_to
!= null then
172 var mtype
= self.unanchor_type
(implicit_cast_to
)
173 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
176 #n.debug("OUT Execute expr: value is {i}")
177 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
178 frame
.current_node
= old
182 # Evaluate `n` as a statement in the current context.
183 # Do nothing if `n` is null.
184 # If `n` cannot be evaluated, then aborts.
185 fun stmt
(n
: nullable AExpr)
188 var frame
= self.frame
189 var old
= frame
.current_node
190 frame
.current_node
= n
191 #n.debug("Execute stmt")
193 frame
.current_node
= old
197 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
198 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
200 # Return the boolean instance associated with `val`.
201 fun bool_instance
(val
: Bool): Instance
203 if val
then return self.true_instance
else return self.false_instance
206 # Return the integer instance associated with `val`.
207 fun int_instance
(val
: Int): Instance
209 var ic
= self.mainmodule
.get_primitive_class
("Int")
210 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
213 # Return the char instance associated with `val`.
214 fun char_instance
(val
: Char): Instance
216 var ic
= self.mainmodule
.get_primitive_class
("Char")
217 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
220 # Return the float instance associated with `val`.
221 fun float_instance
(val
: Float): Instance
223 var ic
= self.mainmodule
.get_primitive_class
("Float")
224 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
227 # The unique intance of the `true` value.
228 var true_instance
: Instance
230 # The unique intance of the `false` value.
231 var false_instance
: Instance
233 # The unique intance of the `null` value.
234 var null_instance
: Instance
236 # Return a new array made of `values`.
237 # The dynamic type of the result is Array[elttype].
238 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
240 assert not elttype
.need_anchor
241 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
242 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
243 var res
= new MutableInstance(mtype
)
244 self.init_instance
(res
)
245 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
249 # Return a new native string initialized with `txt`
250 fun native_string_instance
(txt
: String): Instance
252 var val
= new Buffer.from
(txt
)
254 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
255 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
258 # The current frame used to store local variables of the current method executed
259 fun frame
: Frame do return frames
.first
261 # The stack of all frames. The first one is the current one.
262 var frames
: List[Frame] = new List[Frame]
264 # Return a stack stace. One line per function
265 fun stack_trace
: String
268 b
.append
(",---- Stack trace -- - - -\n")
270 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
272 b
.append
("`------------------- - - -")
276 # Exit the program with a message
277 fun fatal
(message
: String)
279 if frames
.is_empty
then
282 self.frame
.current_node
.fatal
(self, message
)
287 # Debug on the current node
288 fun debug
(message
: String)
290 if frames
.is_empty
then
293 self.frame
.current_node
.debug
(message
)
297 # Store known method, used to trace methods as thez are reached
298 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
300 # Common code for calls to injected methods and normal methods
301 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
303 var vararg_rank
= mpropdef
.msignature
.vararg_rank
304 if vararg_rank
>= 0 then
305 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
307 args
= new Array[Instance]
309 args
.add
(rawargs
.first
) # recv
311 for i
in [0..vararg_rank
[ do
312 args
.add
(rawargs
[i
+1])
315 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
316 var vararg
= new Array[Instance]
317 for i
in [vararg_rank
..vararg_lastrank
] do
318 vararg
.add
(rawargs
[i
+1])
320 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
321 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
322 args
.add
(self.array_instance
(vararg
, elttype
))
324 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
325 args
.add
(rawargs
[i
+1])
331 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
332 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
333 # The call is direct/static. There is no message-seding/late-binding.
334 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
336 args
= call_commons
(mpropdef
, args
)
337 return call_without_varargs
(mpropdef
, args
)
340 # Common code to call and this function
342 # Call only executes the variadic part, this avoids
343 # double encapsulation of variadic parameters into an Array
344 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
346 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
347 self.discover_call_trace
.add mpropdef
348 self.debug
("Discovered {mpropdef}")
350 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
352 # Look for the AST node that implements the property
353 var mproperty
= mpropdef
.mproperty
354 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
355 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
356 self.parameter_check
(npropdef
, mpropdef
, args
)
357 return npropdef
.call
(self, mpropdef
, args
)
358 else if mproperty
.name
== "init" then
359 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
360 self.parameter_check
(nclassdef
, mpropdef
, args
)
361 return nclassdef
.call
(self, mpropdef
, args
)
363 fatal
("Fatal Error: method {mpropdef} not found in the AST")
368 # Generate type checks in the C code to check covariant parameters
369 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
371 var msignature
= mpropdef
.msignature
372 for i
in [0..msignature
.arity
[ do
373 # skip test for vararg since the array is instantiated with the correct polymorphic type
374 if msignature
.vararg_rank
== i
then continue
376 # skip if the cast is not required
377 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
378 if not origmtype
.need_anchor
then continue
380 # get the parameter type
381 var mtype
= msignature
.mparameters
[i
].mtype
382 var anchor
= args
.first
.mtype
.as(MClassType)
383 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
384 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
385 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
390 # Common code for runtime injected calls and normal calls
391 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
393 if mtype
isa MNullType then
394 if mproperty
.name
== "==" then
395 return self.bool_instance
(args
[0] == args
[1])
396 else if mproperty
.name
== "!=" then
397 return self.bool_instance
(args
[0] != args
[1])
399 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
400 fatal
("Receiver is null")
405 # Execute a full `callsite` for given `args`
406 # Use this method, instead of `send` to execute and control the aditionnal behavior of the call-sites
407 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
409 return send
(callsite
.mproperty
, arguments
)
412 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
413 # Return a falue if `mproperty` is a function, or null if it is a procedure.
414 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
415 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
417 var recv
= args
.first
418 var mtype
= recv
.mtype
419 var ret
= send_commons
(mproperty
, args
, mtype
)
420 if ret
!= null then return ret
421 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
422 return self.call
(propdef
, args
)
425 # Read the attribute `mproperty` of an instance `recv` and return its value.
426 # If the attribute in not yet initialized, then aborts with an error message.
427 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
429 assert recv
isa MutableInstance
430 if not recv
.attributes
.has_key
(mproperty
) then
431 fatal
("Uninitialized attribute {mproperty.name}")
434 return recv
.attributes
[mproperty
]
437 # Collect attributes of a type in the order of their init
438 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
440 var cache
= self.collect_attr_propdef_cache
441 if cache
.has_key
(mtype
) then return cache
[mtype
]
443 var res
= new Array[AAttrPropdef]
444 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
445 self.mainmodule
.linearize_mclassdefs
(cds
)
447 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
448 for npropdef
in n
.n_propdefs
do
449 if npropdef
isa AAttrPropdef then
459 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
461 # Fill the initial values of the newly created instance `recv`.
462 # `recv.mtype` is used to know what must be filled.
463 fun init_instance
(recv
: Instance)
465 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
466 npropdef
.init_expr
(self, recv
)
470 # This function determine the correct type according the reciever of the current definition (self).
471 fun unanchor_type
(mtype
: MType): MType
473 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
477 # An instance represents a value of the executed program.
478 abstract class Instance
479 # The dynamic type of the instance
480 # ASSERT: not self.mtype.is_anchored
483 # return true if the instance is the true value.
484 # return false if the instance is the true value.
486 fun is_true
: Bool do abort
488 # Return true if `self` IS `o` (using the Nit semantic of is)
489 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
491 # Human readable object identity "Type#number"
492 redef fun to_s
do return "{mtype}"
494 # Return the integer value if the instance is an integer.
496 fun to_i
: Int do abort
498 # Return the integer value if the instance is a float.
500 fun to_f
: Float do abort
502 # The real value encapsulated if the instance is primitive.
504 fun val
: Object do abort
507 # A instance with attribute (standards objects)
508 class MutableInstance
511 # The values of the attributes
512 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
515 # Special instance to handle primitives values (int, bool, etc.)
516 # The trick it just to encapsulate the <<real>> value
517 class PrimitiveInstance[E
: Object]
520 # The real value encapsulated
523 init(mtype
: MType, val
: E
)
531 if val
== true then return true
532 if val
== false then return false
538 if not o
isa PrimitiveInstance[Object] then return false
539 return self.val
== o
.val
544 if not o
isa PrimitiveInstance[Object] then return false
545 return self.val
.is_same_instance
(o
.val
)
548 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
550 redef fun to_i
do return val
.as(Int)
552 redef fun to_f
do return val
.as(Float)
555 # Information about local variables in a running method
557 # The current visited node
558 # The node is stored by frame to keep a stack trace
559 var current_node
: ANode
560 # The executed property.
561 # A Method in case of a call, an attribute in case of a default initialization.
562 var mpropdef
: MPropDef
563 # Arguments of the method (the first is te receiver
564 var arguments
: Array[Instance]
565 # Mapping betwen a variable an the current value
566 var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
570 # Aborts the program with a message
571 # `v` is used to know if a colored message is displayed or not
572 private fun fatal
(v
: NaiveInterpreter, message
: String)
574 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
575 stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
577 stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
578 stderr
.write
(v
.stack_trace
)
586 # Execute a `mpropdef` associated with the current node.
587 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
589 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
594 redef class AConcreteMethPropdef
596 redef fun call
(v
, mpropdef
, args
)
598 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
599 call_commons
(v
, mpropdef
, args
, f
)
601 if v
.returnmark
== f
then
603 var res
= v
.escapevalue
610 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame)
612 for i
in [0..mpropdef
.msignature
.arity
[ do
613 var variable
= self.n_signature
.n_params
[i
].variable
614 assert variable
!= null
615 f
.map
[variable
] = arguments
[i
+1]
620 # Call the implicit super-init
621 var auto_super_inits
= self.auto_super_inits
622 if auto_super_inits
!= null then
623 var args
= [arguments
.first
]
624 for auto_super_init
in auto_super_inits
do
626 for i
in [0..auto_super_init
.intro
.msignature
.arity
+1[ do
627 args
.add
(arguments
[i
])
629 v
.send
(auto_super_init
, args
)
637 redef class AInternMethPropdef
638 redef fun call
(v
, mpropdef
, args
)
640 var pname
= mpropdef
.mproperty
.name
641 var cname
= mpropdef
.mclassdef
.mclass
.name
642 if pname
== "output" then
643 var recv
= args
.first
646 else if pname
== "object_id" then
647 var recv
= args
.first
648 if recv
isa PrimitiveInstance[Object] then
649 return v
.int_instance
(recv
.val
.object_id
)
651 return v
.int_instance
(recv
.object_id
)
653 else if pname
== "output_class_name" then
654 var recv
= args
.first
657 else if pname
== "native_class_name" then
658 var recv
= args
.first
659 var txt
= recv
.mtype
.to_s
660 return v
.native_string_instance
(txt
)
661 else if pname
== "==" then
662 # == is correclt redefined for instances
663 return v
.bool_instance
(args
[0] == args
[1])
664 else if pname
== "!=" then
665 return v
.bool_instance
(args
[0] != args
[1])
666 else if pname
== "is_same_type" then
667 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
668 else if pname
== "is_same_instance" then
669 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
670 else if pname
== "exit" then
673 else if pname
== "sys" then
675 else if cname
== "Int" then
676 if pname
== "unary -" then
677 return v
.int_instance
(-args
[0].to_i
)
678 else if pname
== "succ" then
679 return v
.int_instance
(args
[0].to_i
+ 1)
680 else if pname
== "prec" then
681 return v
.int_instance
(args
[0].to_i
- 1)
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
.int_instance
(args
[0].to_i
* args
[1].to_i
)
688 else if pname
== "%" then
689 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
690 else if pname
== "/" then
691 return v
.int_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
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
696 else if pname
== "<=" then
697 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
698 else if pname
== ">=" then
699 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
700 else if pname
== "<=>" then
701 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
702 else if pname
== "ascii" then
703 return v
.char_instance
(args
[0].to_i
.ascii
)
704 else if pname
== "to_f" then
705 return v
.float_instance
(args
[0].to_i
.to_f
)
706 else if pname
== "lshift" then
707 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
708 else if pname
== "rshift" then
709 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
711 else if cname
== "Char" then
712 var recv
= args
[0].val
.as(Char)
713 if pname
== "ascii" then
714 return v
.int_instance
(recv
.ascii
)
715 else if pname
== "succ" then
716 return v
.char_instance
(recv
.succ
)
717 else if pname
== "prec" then
718 return v
.char_instance
(recv
.prec
)
719 else if pname
== "<" then
720 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
721 else if pname
== ">" then
722 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
723 else if pname
== "<=" then
724 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
725 else if pname
== ">=" then
726 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
727 else if pname
== "<=>" then
728 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
730 else if cname
== "Float" then
731 var recv
= args
[0].to_f
732 if pname
== "unary -" then
733 return v
.float_instance
(-recv
)
734 else if pname
== "+" then
735 return v
.float_instance
(recv
+ args
[1].to_f
)
736 else if pname
== "-" then
737 return v
.float_instance
(recv
- args
[1].to_f
)
738 else if pname
== "*" then
739 return v
.float_instance
(recv
* args
[1].to_f
)
740 else if pname
== "/" then
741 return v
.float_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
== ">" then
745 return v
.bool_instance
(recv
> args
[1].to_f
)
746 else if pname
== "<=" then
747 return v
.bool_instance
(recv
<= args
[1].to_f
)
748 else if pname
== ">=" then
749 return v
.bool_instance
(recv
>= args
[1].to_f
)
750 else if pname
== "to_i" then
751 return v
.int_instance
(recv
.to_i
)
753 else if cname
== "NativeString" then
754 var recvval
= args
.first
.val
.as(Buffer)
755 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 return v
.char_instance
(recvval
.chars
[arg1
])
761 else if pname
== "[]=" then
762 var arg1
= args
[1].to_i
763 if arg1
>= recvval
.length
or arg1
< 0 then
764 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
766 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
768 else if pname
== "copy_to" then
769 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
770 var destval
= args
[1].val
.as(Buffer)
771 var lenval
= args
[2].to_i
772 var fromval
= args
[3].to_i
773 var toval
= args
[4].to_i
775 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
777 if fromval
+ lenval
>= recvval
.length
then
778 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
781 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
783 if toval
+ lenval
>= destval
.length
then
784 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
786 recvval
.copy
(fromval
, lenval
, destval
, toval
)
788 else if pname
== "atoi" then
789 return v
.int_instance
(recvval
.to_i
)
791 else if pname
== "calloc_string" then
792 return v
.native_string_instance
("!" * args
[1].to_i
)
793 else if cname
== "NativeArray" then
794 var recvval
= args
.first
.val
.as(Array[Instance])
795 if pname
== "[]" then
796 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
797 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
799 return recvval
[args
[1].to_i
]
800 else if pname
== "[]=" then
801 recvval
[args
[1].to_i
] = args
[2]
803 else if pname
== "copy_to" then
804 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
807 else if pname
== "calloc_array" then
808 var recvtype
= args
.first
.mtype
.as(MClassType)
810 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
811 mtype
= mtype
.arguments
.first
812 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
813 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
814 else if pname
== "native_argc" then
815 return v
.int_instance
(v
.arguments
.length
)
816 else if pname
== "native_argv" then
817 var txt
= v
.arguments
[args
[1].to_i
]
818 return v
.native_string_instance
(txt
)
820 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
825 redef class AbstractArray[E
]
826 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
828 self.copy_to
(start
, len
, dest
, new_start
)
832 redef class AExternInitPropdef
833 redef fun call
(v
, mpropdef
, args
)
835 var pname
= mpropdef
.mproperty
.name
836 var cname
= mpropdef
.mclassdef
.mclass
.name
837 if pname
== "native_stdout" then
838 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdout
)
839 else if pname
== "native_stdin" then
840 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdin
)
841 else if pname
== "native_stderr" then
842 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stderr
)
843 else if pname
== "io_open_read" then
844 var a1
= args
[1].val
.as(Buffer)
845 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
846 else if pname
== "io_open_write" then
847 var a1
= args
[1].val
.as(Buffer)
848 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
850 fatal
(v
, "NOT YET IMPLEMENTED extern init {mpropdef}")
855 redef class AExternMethPropdef
857 redef fun call
(v
, mpropdef
, args
)
859 var pname
= mpropdef
.mproperty
.name
860 var cname
= mpropdef
.mclassdef
.mclass
.name
861 if cname
== "Int" then
862 var recvval
= args
.first
.val
.as(Int)
863 if pname
== "rand" then
864 var res
= recvval
.rand
865 return v
.int_instance
(res
)
866 else if pname
== "native_int_to_s" then
867 return v
.native_string_instance
(recvval
.to_s
)
869 else if cname
== "NativeFile" then
870 var recvval
= args
.first
.val
871 if pname
== "io_write" then
872 var a1
= args
[1].val
.as(Buffer)
873 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
))
875 else if pname
== "io_read" then
876 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
877 var a1
= args
[1].val
.as(Buffer)
878 new Buffer.from
(str
).copy
(0, str
.length
, a1
, 0)
879 return v
.int_instance
(str
.length
)
880 else if pname
== "io_close" then
881 recvval
.as(IOS).close
882 return v
.int_instance
(0)
884 else if cname
== "NativeString" then
885 var recvval
= args
.first
.val
.as(Buffer)
886 if pname
== "file_exists" then
887 return v
.bool_instance
(recvval
.to_s
.file_exists
)
888 else if pname
== "file_mkdir" then
891 else if pname
== "file_chdir" then
894 else if pname
== "file_realpath" then
895 return v
.native_string_instance
(recvval
.to_s
.realpath
)
896 else if pname
== "get_environ" then
897 var txt
= recvval
.to_s
.environ
898 return v
.native_string_instance
(txt
)
899 else if pname
== "system" then
900 var res
= sys
.system
(recvval
.to_s
)
901 return v
.int_instance
(res
)
902 else if pname
== "atof" then
903 return v
.float_instance
(recvval
.to_f
)
905 else if cname
== "Int" then
906 if pname
== "rand" then
907 return v
.int_instance
(args
[0].to_i
.rand
)
909 else if cname
== "Float" then
910 if pname
== "cos" then
911 return v
.float_instance
(args
[0].to_f
.cos
)
912 else if pname
== "sin" then
913 return v
.float_instance
(args
[0].to_f
.sin
)
914 else if pname
== "tan" then
915 return v
.float_instance
(args
[0].to_f
.tan
)
916 else if pname
== "acos" then
917 return v
.float_instance
(args
[0].to_f
.acos
)
918 else if pname
== "asin" then
919 return v
.float_instance
(args
[0].to_f
.asin
)
920 else if pname
== "atan" then
921 return v
.float_instance
(args
[0].to_f
.atan
)
922 else if pname
== "sqrt" then
923 return v
.float_instance
(args
[0].to_f
.sqrt
)
924 else if pname
== "exp" then
925 return v
.float_instance
(args
[0].to_f
.exp
)
926 else if pname
== "log" then
927 return v
.float_instance
(args
[0].to_f
.log
)
928 else if pname
== "pow" then
929 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
930 else if pname
== "rand" then
931 return v
.float_instance
(args
[0].to_f
.rand
)
933 else if pname
== "native_argc" then
934 return v
.int_instance
(v
.arguments
.length
)
935 else if pname
== "native_argv" then
936 var txt
= v
.arguments
[args
[1].to_i
]
937 return v
.native_string_instance
(txt
)
938 else if pname
== "get_time" then
939 return v
.int_instance
(get_time
)
940 else if pname
== "srand_from" then
941 srand_from
(args
[1].to_i
)
943 else if pname
== "atan2" then
944 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
945 else if pname
== "pi" then
946 return v
.float_instance
(pi
)
947 else if pname
== "lexer_goto" then
948 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
949 else if pname
== "lexer_accept" then
950 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
951 else if pname
== "parser_goto" then
952 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
953 else if pname
== "parser_action" then
954 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
955 else if pname
== "file_getcwd" then
956 return v
.native_string_instance
(getcwd
)
958 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
963 redef class AAttrPropdef
964 redef fun call
(v
, mpropdef
, args
)
966 var recv
= args
.first
967 assert recv
isa MutableInstance
968 var attr
= self.mpropdef
.mproperty
969 if args
.length
== 1 then
970 return v
.read_attribute
(attr
, recv
)
972 assert args
.length
== 2
973 recv
.attributes
[attr
] = args
[1]
978 # Evaluate and set the default value of the attribute in `recv`
979 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
981 assert recv
isa MutableInstance
982 var nexpr
= self.n_expr
983 if nexpr
!= null then
984 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
986 var val
= v
.expr
(nexpr
)
989 assert not v
.is_escaping
990 recv
.attributes
[self.mpropdef
.mproperty
] = val
993 var mtype
= self.mpropdef
.static_mtype
.as(not null)
994 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
995 if mtype
isa MNullableType then
996 recv
.attributes
[self.mpropdef
.mproperty
] = v
.null_instance
1001 redef class ADeferredMethPropdef
1002 redef fun call
(v
, mpropdef
, args
)
1004 fatal
(v
, "Abstract method `{mpropdef.mproperty.name}` called on `{args.first.mtype}`")
1009 redef class AClassdef
1010 # Execute an implicit `mpropdef` associated with the current node.
1011 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1013 var super_inits
= self.super_inits
1014 if super_inits
!= null then
1015 assert args
.length
== 1
1016 for su
in super_inits
do
1021 var recv
= args
.first
1022 assert recv
isa MutableInstance
1024 # Collect undefined attributes
1025 for npropdef
in self.n_propdefs
do
1026 if npropdef
isa AAttrPropdef and npropdef
.n_expr
== null then
1027 recv
.attributes
[npropdef
.mpropdef
.mproperty
] = args
[i
]
1036 # Evaluate the node as a possible expression.
1037 # Return a possible value
1038 # NOTE: Do not call this method directly, but use `v.expr`
1039 # This method is here to be implemented by subclasses.
1040 private fun expr
(v
: NaiveInterpreter): nullable Instance
1042 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1046 # Evaluate the node as a statement.
1047 # NOTE: Do not call this method directly, but use `v.stmt`
1048 # This method is here to be implemented by subclasses (no need to return something).
1049 private fun stmt
(v
: NaiveInterpreter)
1056 redef class ABlockExpr
1059 var last
= self.n_expr
.last
1060 for e
in self.n_expr
do
1061 if e
== last
then break
1063 if v
.is_escaping
then return null
1070 for e
in self.n_expr
do
1072 if v
.is_escaping
then return
1077 redef class AVardeclExpr
1080 var ne
= self.n_expr
1083 if i
== null then return
1084 v
.frame
.map
[self.variable
.as(not null)] = i
1089 redef class AVarExpr
1092 return v
.frame
.map
[self.variable
.as(not null)]
1096 redef class AVarAssignExpr
1099 var i
= v
.expr
(self.n_value
)
1100 if i
== null then return null
1101 v
.frame
.map
[self.variable
.as(not null)] = i
1106 redef class AVarReassignExpr
1109 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1110 var value
= v
.expr
(self.n_value
)
1111 if value
== null then return
1112 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1114 v
.frame
.map
[self.variable
.as(not null)] = res
1118 redef class ASelfExpr
1121 return v
.frame
.arguments
.first
1125 redef class AContinueExpr
1128 var ne
= self.n_expr
1131 if i
== null then return
1134 v
.continuemark
= self.escapemark
1138 redef class ABreakExpr
1141 var ne
= self.n_expr
1144 if i
== null then return
1147 v
.breakmark
= self.escapemark
1151 redef class AReturnExpr
1154 var ne
= self.n_expr
1157 if i
== null then return
1160 v
.returnmark
= v
.frame
1164 redef class AAbortExpr
1175 var cond
= v
.expr
(self.n_expr
)
1176 if cond
== null then return null
1177 if cond
.is_true
then
1178 return v
.expr
(self.n_then
.as(not null))
1180 return v
.expr
(self.n_else
.as(not null))
1186 var cond
= v
.expr
(self.n_expr
)
1187 if cond
== null then return
1188 if cond
.is_true
then
1196 redef class AIfexprExpr
1199 var cond
= v
.expr
(self.n_expr
)
1200 if cond
== null then return null
1201 if cond
.is_true
then
1202 return v
.expr
(self.n_then
)
1204 return v
.expr
(self.n_else
)
1212 v
.stmt
(self.n_block
)
1213 v
.is_break
(self.escapemark
) # Clear the break (if any)
1217 redef class AWhileExpr
1221 var cond
= v
.expr
(self.n_expr
)
1222 if cond
== null then return
1223 if not cond
.is_true
then return
1224 v
.stmt
(self.n_block
)
1225 if v
.is_break
(self.escapemark
) then return
1226 v
.is_continue
(self.escapemark
) # Clear the break
1227 if v
.is_escaping
then return
1232 redef class ALoopExpr
1236 v
.stmt
(self.n_block
)
1237 if v
.is_break
(self.escapemark
) then return
1238 v
.is_continue
(self.escapemark
) # Clear the break
1239 if v
.is_escaping
then return
1244 redef class AForExpr
1247 var col
= v
.expr
(self.n_expr
)
1248 if col
== null then return
1249 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1251 #self.debug("col {col}")
1252 var iter
= v
.send
(v
.force_get_primitive_method
("iterator", col
.mtype
), [col
]).as(not null)
1253 #self.debug("iter {iter}")
1255 var isok
= v
.send
(v
.force_get_primitive_method
("is_ok", iter
.mtype
), [iter
]).as(not null)
1256 if not isok
.is_true
then return
1257 if self.variables
.length
== 1 then
1258 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1259 #self.debug("item {item}")
1260 v
.frame
.map
[self.variables
.first
] = item
1261 else if self.variables
.length
== 2 then
1262 var key
= v
.send
(v
.force_get_primitive_method
("key", iter
.mtype
), [iter
]).as(not null)
1263 v
.frame
.map
[self.variables
[0]] = key
1264 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1265 v
.frame
.map
[self.variables
[1]] = item
1269 v
.stmt
(self.n_block
)
1270 if v
.is_break
(self.escapemark
) then return
1271 v
.is_continue
(self.escapemark
) # Clear the break
1272 if v
.is_escaping
then return
1273 v
.send
(v
.force_get_primitive_method
("next", iter
.mtype
), [iter
])
1278 redef class AAssertExpr
1281 var cond
= v
.expr
(self.n_expr
)
1282 if cond
== null then return
1283 if not cond
.is_true
then
1285 if v
.is_escaping
then return
1288 fatal
(v
, "Assert '{nid.text}' failed")
1290 fatal
(v
, "Assert failed")
1300 var cond
= v
.expr
(self.n_expr
)
1301 if cond
== null then return null
1302 if cond
.is_true
then return cond
1303 return v
.expr
(self.n_expr2
)
1307 redef class AImpliesExpr
1310 var cond
= v
.expr
(self.n_expr
)
1311 if cond
== null then return null
1312 if not cond
.is_true
then return v
.true_instance
1313 return v
.expr
(self.n_expr2
)
1317 redef class AAndExpr
1320 var cond
= v
.expr
(self.n_expr
)
1321 if cond
== null then return null
1322 if not cond
.is_true
then return cond
1323 return v
.expr
(self.n_expr2
)
1327 redef class ANotExpr
1330 var cond
= v
.expr
(self.n_expr
)
1331 if cond
== null then return null
1332 return v
.bool_instance
(not cond
.is_true
)
1336 redef class AOrElseExpr
1339 var i
= v
.expr
(self.n_expr
)
1340 if i
== null then return null
1341 if i
!= v
.null_instance
then return i
1342 return v
.expr
(self.n_expr2
)
1346 redef class AIntExpr
1349 return v
.int_instance
(self.value
.as(not null))
1353 redef class AFloatExpr
1356 return v
.float_instance
(self.value
.as(not null))
1360 redef class ACharExpr
1363 return v
.char_instance
(self.value
.as(not null))
1367 redef class AArrayExpr
1370 var val
= new Array[Instance]
1371 for nexpr
in self.n_exprs
.n_exprs
do
1372 var i
= v
.expr
(nexpr
)
1373 if i
== null then return null
1376 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1377 var elttype
= mtype
.arguments
.first
1378 return v
.array_instance
(val
, elttype
)
1382 redef class AStringFormExpr
1385 var txt
= self.value
.as(not null)
1386 var nat
= v
.native_string_instance
(txt
)
1387 var res
= v
.send
(v
.force_get_primitive_method
("to_s", nat
.mtype
), [nat
]).as(not null)
1392 redef class ASuperstringExpr
1395 var array
= new Array[Instance]
1396 for nexpr
in n_exprs
do
1397 var i
= v
.expr
(nexpr
)
1398 if i
== null then return null
1401 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1402 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1408 redef class ACrangeExpr
1411 var e1
= v
.expr
(self.n_expr
)
1412 if e1
== null then return null
1413 var e2
= v
.expr
(self.n_expr2
)
1414 if e2
== null then return null
1415 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1416 var res
= new MutableInstance(mtype
)
1417 v
.init_instance
(res
)
1418 v
.send
(v
.force_get_primitive_method
("init", mtype
), [res
, e1
, e2
])
1423 redef class AOrangeExpr
1426 var e1
= v
.expr
(self.n_expr
)
1427 if e1
== null then return null
1428 var e2
= v
.expr
(self.n_expr2
)
1429 if e2
== null then return null
1430 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1431 var res
= new MutableInstance(mtype
)
1432 v
.init_instance
(res
)
1433 v
.send
(v
.force_get_primitive_method
("without_last", mtype
), [res
, e1
, e2
])
1438 redef class ATrueExpr
1441 return v
.bool_instance
(true)
1445 redef class AFalseExpr
1448 return v
.bool_instance
(false)
1452 redef class ANullExpr
1455 return v
.null_instance
1459 redef class AIsaExpr
1462 var i
= v
.expr
(self.n_expr
)
1463 if i
== null then return null
1464 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1465 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1469 redef class AAsCastExpr
1472 var i
= v
.expr
(self.n_expr
)
1473 if i
== null then return null
1474 var mtype
= self.mtype
.as(not null)
1475 var amtype
= v
.unanchor_type
(mtype
)
1476 if not v
.is_subtype
(i
.mtype
, amtype
) then
1477 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1483 redef class AAsNotnullExpr
1486 var i
= v
.expr
(self.n_expr
)
1487 if i
== null then return null
1488 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1489 if i
.mtype
isa MNullType then
1490 fatal
(v
, "Cast failed")
1496 redef class AParExpr
1499 return v
.expr
(self.n_expr
)
1503 redef class AOnceExpr
1506 if v
.onces
.has_key
(self) then
1507 return v
.onces
[self]
1509 var res
= v
.expr
(self.n_expr
)
1510 if res
== null then return null
1517 redef class ASendExpr
1520 var recv
= v
.expr
(self.n_expr
)
1521 if recv
== null then return null
1523 for a
in self.raw_arguments
.as(not null) do
1525 if i
== null then return null
1529 var res
= v
.callsite
(callsite
, args
)
1534 redef class ASendReassignFormExpr
1537 var recv
= v
.expr
(self.n_expr
)
1538 if recv
== null then return
1540 for a
in self.raw_arguments
.as(not null) do
1542 if i
== null then return
1545 var value
= v
.expr
(self.n_value
)
1546 if value
== null then return
1548 var read
= v
.callsite
(callsite
, args
)
1551 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1552 assert write
!= null
1556 v
.callsite
(write_callsite
, args
)
1560 redef class ASuperExpr
1563 var recv
= v
.frame
.arguments
.first
1565 for a
in self.n_args
.n_exprs
do
1567 if i
== null then return null
1571 var callsite
= self.callsite
1572 if callsite
!= null then
1573 # Add additionnals arguments for the super init call
1574 if args
.length
== 1 then
1575 for i
in [0..callsite
.mproperty
.intro
.msignature
.arity
[ do
1576 args
.add
(v
.frame
.arguments
[i
+1])
1580 var res
= v
.callsite
(callsite
, args
)
1584 if args
.length
== 1 then
1585 args
= v
.frame
.arguments
1588 # stantard call-next-method
1589 var mpropdef
= v
.frame
.mpropdef
1590 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1591 assert mpropdef
isa MMethodDef
1592 var res
= v
.call_without_varargs
(mpropdef
, args
)
1597 redef class ANewExpr
1600 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1601 var recv
: Instance = new MutableInstance(mtype
)
1602 v
.init_instance
(recv
)
1604 for a
in self.n_args
.n_exprs
do
1606 if i
== null then return null
1609 var res2
= v
.callsite
(callsite
, args
)
1610 if res2
!= null then
1611 #self.debug("got {res2} from {mproperty}. drop {recv}")
1618 redef class AAttrExpr
1621 var recv
= v
.expr
(self.n_expr
)
1622 if recv
== null then return null
1623 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1624 var mproperty
= self.mproperty
.as(not null)
1625 return v
.read_attribute
(mproperty
, recv
)
1629 redef class AAttrAssignExpr
1632 var recv
= v
.expr
(self.n_expr
)
1633 if recv
== null then return
1634 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1635 var i
= v
.expr
(self.n_value
)
1636 if i
== null then return
1637 var mproperty
= self.mproperty
.as(not null)
1638 assert recv
isa MutableInstance
1639 recv
.attributes
[mproperty
] = i
1643 redef class AAttrReassignExpr
1646 var recv
= v
.expr
(self.n_expr
)
1647 if recv
== null then return
1648 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1649 var value
= v
.expr
(self.n_value
)
1650 if value
== null then return
1651 var mproperty
= self.mproperty
.as(not null)
1652 var attr
= v
.read_attribute
(mproperty
, recv
)
1653 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1655 assert recv
isa MutableInstance
1656 recv
.attributes
[mproperty
] = res
1660 redef class AIssetAttrExpr
1663 var recv
= v
.expr
(self.n_expr
)
1664 if recv
== null then return null
1665 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1666 var mproperty
= self.mproperty
.as(not null)
1667 assert recv
isa MutableInstance
1668 return v
.bool_instance
(recv
.attributes
.has_key
(mproperty
))
1672 redef class ADebugTypeExpr