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
.mclass
)
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
.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")
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 sull.
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
)])
245 self.check_init_instance
(res
)
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 # Execute `mpropdef' for a `args' (where args[0] is the receiver).
301 # Return a falue if `mpropdef' is a function, or null if it is a procedure.
302 # The call is direct/static. There is no message-seding/late-bindng.
303 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
305 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
306 self.discover_call_trace
.add mpropdef
307 self.debug
("Discovered {mpropdef}")
309 var vararg_rank
= mpropdef
.msignature
.vararg_rank
310 if vararg_rank
>= 0 then
311 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
313 args
= new Array[Instance]
315 args
.add
(rawargs
.first
) # recv
317 for i
in [0..vararg_rank
[ do
318 args
.add
(rawargs
[i
+1])
321 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
322 var vararg
= new Array[Instance]
323 for i
in [vararg_rank
..vararg_lastrank
] do
324 vararg
.add
(rawargs
[i
+1])
326 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
327 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
328 args
.add
(self.array_instance
(vararg
, elttype
))
330 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
331 args
.add
(rawargs
[i
+1])
334 if args
.length
< mpropdef
.msignature
.arity
+ 1 or args
.length
> mpropdef
.msignature
.arity
+ 1 + mpropdef
.msignature
.mclosures
.length
then
335 fatal
("NOT YET IMPLEMENTED: Invalid arity for {mpropdef}. {args.length} arguments given.")
337 if args
.length
< mpropdef
.msignature
.arity
+ 1 + mpropdef
.msignature
.mclosures
.length
then
338 fatal
("NOT YET IMPLEMENTED: default closures")
341 # Look for the AST node that implements the property
342 var mproperty
= mpropdef
.mproperty
343 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
344 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
345 self.parameter_check
(npropdef
, mpropdef
, args
)
346 return npropdef
.call
(self, mpropdef
, args
)
347 else if mproperty
.name
== "init" then
348 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
349 self.parameter_check
(nclassdef
, mpropdef
, args
)
350 return nclassdef
.call
(self, mpropdef
, args
)
352 fatal
("Fatal Error: method {mpropdef} not found in the AST")
357 # Generate type checks in the C code to check covariant parameters
358 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
360 var msignature
= mpropdef
.msignature
361 for i
in [0..msignature
.arity
[ do
362 # skip test for vararg since the array is instantiated with the correct polymorphic type
363 if msignature
.vararg_rank
== i
then continue
365 # skip if the cast is not required
366 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
367 if not origmtype
.need_anchor
then continue
369 # get the parameter type
370 var mtype
= msignature
.mparameters
[i
].mtype
371 var anchor
= args
.first
.mtype
.as(MClassType)
372 mtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
373 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, mtype
) then
374 node
.fatal
(self, "Cast failed")
379 fun call_closure
(closure
: ClosureInstance, args
: Array[Instance]): nullable Instance
381 var nclosuredef
= closure
.nclosuredef
382 var f
= closure
.frame
383 for i
in [0..closure
.nclosuredef
.mclosure
.mtype
.as(MSignature).arity
[ do
384 var variable
= nclosuredef
.variables
[i
]
385 f
.map
[variable
] = args
[i
]
388 self.frames
.unshift
(f
)
390 self.stmt
(nclosuredef
.n_expr
)
394 if self.is_continue
(nclosuredef
.escapemark
) then
395 var res
= self.escapevalue
396 self.escapevalue
= null
402 # Execute `mproperty' for a `args' (where args[0] is the receiver).
403 # Return a falue if `mproperty' is a function, or null if it is a procedure.
404 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
405 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
407 var recv
= args
.first
408 var mtype
= recv
.mtype
409 if mtype
isa MNullType then
410 if mproperty
.name
== "==" then
411 return self.bool_instance
(args
[0] == args
[1])
412 else if mproperty
.name
== "!=" then
413 return self.bool_instance
(args
[0] != args
[1])
415 #fatal("Reciever is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
416 fatal
("Reciever is null")
419 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
420 return self.call
(propdef
, args
)
423 # Read the attribute `mproperty' of an instance `recv' and return its value.
424 # If the attribute in not yet initialized, then aborts with an error message.
425 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
427 assert recv
isa MutableInstance
428 if not recv
.attributes
.has_key
(mproperty
) then
429 fatal
("Uninitialized attribute {mproperty.name}")
432 return recv
.attributes
[mproperty
]
435 # Collect attributes of a type in the order of their init
436 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
438 var cache
= self.collect_attr_propdef_cache
439 if cache
.has_key
(mtype
) then return cache
[mtype
]
441 var res
= new Array[AAttrPropdef]
442 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
443 self.mainmodule
.linearize_mclassdefs
(cds
)
445 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
446 for npropdef
in n
.n_propdefs
do
447 if npropdef
isa AAttrPropdef then
457 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
459 # Fill the initial values of the newly created instance `recv'.
460 # `recv.mtype' is used to know what must be filled.
461 fun init_instance
(recv
: Instance)
463 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
464 npropdef
.init_expr
(self, recv
)
468 # Check that non nullable attributes of `recv' are correctly initialized.
469 # This function is used as the last instruction of a new
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 var recv
= args
[0].to_f
756 if pname
== "unary -" then
757 return v
.float_instance
(-recv
)
758 else if pname
== "+" then
759 return v
.float_instance
(recv
+ args
[1].to_f
)
760 else if pname
== "-" then
761 return v
.float_instance
(recv
- args
[1].to_f
)
762 else if pname
== "*" then
763 return v
.float_instance
(recv
* args
[1].to_f
)
764 else if pname
== "/" then
765 return v
.float_instance
(recv
/ args
[1].to_f
)
766 else if pname
== "<" then
767 return v
.bool_instance
(recv
< args
[1].to_f
)
768 else if pname
== ">" then
769 return v
.bool_instance
(recv
> args
[1].to_f
)
770 else if pname
== "<=" then
771 return v
.bool_instance
(recv
<= args
[1].to_f
)
772 else if pname
== ">=" then
773 return v
.bool_instance
(recv
>= args
[1].to_f
)
774 else if pname
== "to_i" then
775 return v
.int_instance
(recv
.to_i
)
777 else if cname
== "NativeString" then
778 var recvval
= args
.first
.val
.as(Buffer)
779 if pname
== "[]" then
780 var arg1
= args
[1].to_i
781 if arg1
>= recvval
.length
or arg1
< 0 then
782 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
784 return v
.char_instance
(recvval
[arg1
])
785 else if pname
== "[]=" then
786 var arg1
= args
[1].to_i
787 if arg1
>= recvval
.length
or arg1
< 0 then
788 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
790 recvval
[arg1
] = args
[2].val
.as(Char)
792 else if pname
== "copy_to" then
793 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
794 var destval
= args
[1].val
.as(Buffer)
795 var lenval
= args
[2].to_i
796 var fromval
= args
[3].to_i
797 var toval
= args
[4].to_i
799 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
801 if fromval
+ lenval
>= recvval
.length
then
802 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
805 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
807 if toval
+ lenval
>= destval
.length
then
808 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
810 recvval
.copy
(fromval
, lenval
, destval
, toval
)
812 else if pname
== "atoi" then
813 return v
.int_instance
(recvval
.to_i
)
815 else if pname
== "calloc_string" then
816 return v
.native_string_instance
("!" * args
[1].to_i
)
817 else if cname
== "NativeArray" then
818 var recvval
= args
.first
.val
.as(Array[Instance])
819 if pname
== "[]" then
820 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
821 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
823 return recvval
[args
[1].to_i
]
824 else if pname
== "[]=" then
825 recvval
[args
[1].to_i
] = args
[2]
827 else if pname
== "copy_to" then
828 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
831 else if pname
== "calloc_array" then
832 var recvtype
= args
.first
.mtype
.as(MClassType)
834 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
835 mtype
= mtype
.arguments
.first
836 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
837 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
838 else if pname
== "native_argc" then
839 return v
.int_instance
(v
.arguments
.length
)
840 else if pname
== "native_argv" then
841 var txt
= v
.arguments
[args
[1].to_i
]
842 return v
.native_string_instance
(txt
)
844 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
849 redef class AbstractArray[E
]
850 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
852 self.copy_to
(start
, len
, dest
, new_start
)
856 redef class AExternInitPropdef
857 redef fun call
(v
, mpropdef
, args
)
859 var pname
= mpropdef
.mproperty
.name
860 var cname
= mpropdef
.mclassdef
.mclass
.name
861 if pname
== "native_stdout" then
862 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdout
)
863 else if pname
== "native_stdin" then
864 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stdin
)
865 else if pname
== "native_stderr" then
866 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, stderr
)
867 else if pname
== "io_open_read" then
868 var a1
= args
[1].val
.as(Buffer)
869 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
870 else if pname
== "io_open_write" then
871 var a1
= args
[1].val
.as(Buffer)
872 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
874 fatal
(v
, "NOT YET IMPLEMENTED extern init {mpropdef}")
879 redef class AExternMethPropdef
881 redef fun call
(v
, mpropdef
, args
)
883 var pname
= mpropdef
.mproperty
.name
884 var cname
= mpropdef
.mclassdef
.mclass
.name
885 if cname
== "Int" then
886 var recvval
= args
.first
.val
.as(Int)
887 if pname
== "rand" then
888 var res
= recvval
.rand
889 return v
.int_instance
(res
)
891 else if cname
== "NativeFile" then
892 var recvval
= args
.first
.val
893 if pname
== "io_write" then
894 var a1
= args
[1].val
.as(Buffer)
895 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
))
897 else if pname
== "io_read" then
898 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
899 var a1
= args
[1].val
.as(Buffer)
900 new Buffer.from
(str
).copy
(0, str
.length
, a1
, 0)
901 return v
.int_instance
(str
.length
)
902 else if pname
== "io_close" then
903 recvval
.as(IOS).close
904 return v
.int_instance
(0)
906 else if cname
== "NativeString" then
907 var recvval
= args
.first
.val
.as(Buffer)
908 if pname
== "file_exists" then
909 return v
.bool_instance
(recvval
.to_s
.file_exists
)
910 else if pname
== "file_mkdir" then
913 else if pname
== "get_environ" then
914 var txt
= recvval
.to_s
.environ
915 return v
.native_string_instance
(txt
)
916 else if pname
== "system" then
917 var res
= sys
.system
(recvval
.to_s
)
918 return v
.int_instance
(res
)
919 else if pname
== "atof" then
920 return v
.float_instance
(recvval
.to_f
)
922 else if cname
== "Int" then
923 if pname
== "rand" then
924 return v
.int_instance
(args
[0].to_i
.rand
)
926 else if cname
== "Float" then
927 if pname
== "cos" then
928 return v
.float_instance
(args
[0].to_f
.cos
)
929 else if pname
== "sin" then
930 return v
.float_instance
(args
[0].to_f
.sin
)
931 else if pname
== "tan" then
932 return v
.float_instance
(args
[0].to_f
.tan
)
933 else if pname
== "acos" then
934 return v
.float_instance
(args
[0].to_f
.acos
)
935 else if pname
== "asin" then
936 return v
.float_instance
(args
[0].to_f
.asin
)
937 else if pname
== "atan" then
938 return v
.float_instance
(args
[0].to_f
.atan
)
939 else if pname
== "sqrt" then
940 return v
.float_instance
(args
[0].to_f
.sqrt
)
941 else if pname
== "exp" then
942 return v
.float_instance
(args
[0].to_f
.exp
)
943 else if pname
== "log" then
944 return v
.float_instance
(args
[0].to_f
.log
)
945 else if pname
== "pow" then
946 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
947 else if pname
== "rand" then
948 return v
.float_instance
(args
[0].to_f
.rand
)
950 else if pname
== "native_argc" then
951 return v
.int_instance
(v
.arguments
.length
)
952 else if pname
== "native_argv" then
953 var txt
= v
.arguments
[args
[1].to_i
]
954 return v
.native_string_instance
(txt
)
955 else if pname
== "get_time" then
956 return v
.int_instance
(get_time
)
957 else if pname
== "srand_from" then
958 srand_from
(args
[1].to_i
)
960 else if pname
== "atan2" then
961 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
962 else if pname
== "pi" then
963 return v
.float_instance
(pi
)
964 else if pname
== "lexer_goto" then
965 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
966 else if pname
== "lexer_accept" then
967 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
968 else if pname
== "parser_goto" then
969 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
970 else if pname
== "parser_action" then
971 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
973 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
978 redef class AAttrPropdef
979 redef fun call
(v
, mpropdef
, args
)
981 var recv
= args
.first
982 assert recv
isa MutableInstance
983 var attr
= self.mpropdef
.mproperty
984 if args
.length
== 1 then
985 return v
.read_attribute
(attr
, recv
)
987 assert args
.length
== 2
988 recv
.attributes
[attr
] = args
[1]
993 # Evaluate and set the default value of the attribute in `recv'
994 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
996 assert recv
isa MutableInstance
997 var nexpr
= self.n_expr
998 if nexpr
!= null then
999 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1001 var val
= v
.expr
(nexpr
)
1004 assert not v
.is_escaping
1005 recv
.attributes
[self.mpropdef
.mproperty
] = val
1008 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1009 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1010 if mtype
isa MNullableType then
1011 recv
.attributes
[self.mpropdef
.mproperty
] = v
.null_instance
1016 redef class ADeferredMethPropdef
1017 redef fun call
(v
, mpropdef
, args
)
1019 fatal
(v
, "Deferred method called")
1024 redef class AClassdef
1025 # Execute an implicit `mpropdef' associated with the current node.
1026 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1028 var super_inits
= self.super_inits
1029 if super_inits
!= null then
1030 assert args
.length
== 1
1031 for su
in super_inits
do
1036 var recv
= args
.first
1037 assert recv
isa MutableInstance
1039 # Collect undefined attributes
1040 for npropdef
in self.n_propdefs
do
1041 if npropdef
isa AAttrPropdef and npropdef
.n_expr
== null then
1042 recv
.attributes
[npropdef
.mpropdef
.mproperty
] = args
[i
]
1051 # Evaluate the node as a possible expression.
1052 # Return a possible value
1053 # NOTE: Do not call this method directly, but use `v.expr'
1054 # This method is here to be implemented by subclasses.
1055 private fun expr
(v
: NaiveInterpreter): nullable Instance
1057 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1061 # Evaluate the node as a statement.
1062 # NOTE: Do not call this method directly, but use `v.stmt'
1063 # This method is here to be implemented by subclasses (no need to return something).
1064 private fun stmt
(v
: NaiveInterpreter)
1071 redef class ABlockExpr
1074 for e
in self.n_expr
do
1076 if v
.is_escaping
then return
1081 redef class AVardeclExpr
1084 var ne
= self.n_expr
1087 if i
== null then return
1088 v
.frame
.map
[self.variable
.as(not null)] = i
1093 redef class AVarExpr
1096 return v
.frame
.map
[self.variable
.as(not null)]
1100 redef class AVarAssignExpr
1103 var i
= v
.expr
(self.n_value
)
1104 if i
== null then return
1105 v
.frame
.map
[self.variable
.as(not null)] = i
1109 redef class AVarReassignExpr
1112 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1113 var value
= v
.expr
(self.n_value
)
1114 if value
== null then return
1115 var res
= v
.send
(reassign_property
.mproperty
, [vari
, value
])
1117 v
.frame
.map
[self.variable
.as(not null)] = res
1121 redef class ASelfExpr
1124 return v
.frame
.arguments
.first
1128 redef class AContinueExpr
1131 var ne
= self.n_expr
1134 if i
== null then return
1137 v
.continuemark
= self.escapemark
1141 redef class ABreakExpr
1144 var ne
= self.n_expr
1147 if i
== null then return
1150 v
.breakmark
= self.escapemark
1154 redef class AReturnExpr
1157 var ne
= self.n_expr
1160 if i
== null then return
1163 v
.returnmark
= v
.frame
1167 redef class AAbortExpr
1178 var cond
= v
.expr
(self.n_expr
)
1179 if cond
== null then return
1180 if cond
.is_true
then
1188 redef class AIfexprExpr
1191 var cond
= v
.expr
(self.n_expr
)
1192 if cond
== null then return null
1193 if cond
.is_true
then
1194 return v
.expr
(self.n_then
)
1196 return v
.expr
(self.n_else
)
1204 v
.stmt
(self.n_block
)
1205 v
.is_break
(self.escapemark
) # Clear the break (if any)
1209 redef class AWhileExpr
1213 var cond
= v
.expr
(self.n_expr
)
1214 if cond
== null then return
1215 if not cond
.is_true
then return
1216 v
.stmt
(self.n_block
)
1217 if v
.is_break
(self.escapemark
) then return
1218 v
.is_continue
(self.escapemark
) # Clear the break
1219 if v
.is_escaping
then return
1224 redef class ALoopExpr
1228 v
.stmt
(self.n_block
)
1229 if v
.is_break
(self.escapemark
) then return
1230 v
.is_continue
(self.escapemark
) # Clear the break
1231 if v
.is_escaping
then return
1236 redef class AForExpr
1239 var col
= v
.expr
(self.n_expr
)
1240 if col
== null then return
1241 #self.debug("col {col}")
1242 var iter
= v
.send
(v
.force_get_primitive_method
("iterator", col
.mtype
), [col
]).as(not null)
1243 #self.debug("iter {iter}")
1245 var isok
= v
.send
(v
.force_get_primitive_method
("is_ok", iter
.mtype
), [iter
]).as(not null)
1246 if not isok
.is_true
then return
1247 if self.variables
.length
== 1 then
1248 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1249 #self.debug("item {item}")
1250 v
.frame
.map
[self.variables
.first
] = item
1251 else if self.variables
.length
== 2 then
1252 var key
= v
.send
(v
.force_get_primitive_method
("key", iter
.mtype
), [iter
]).as(not null)
1253 v
.frame
.map
[self.variables
[0]] = key
1254 var item
= v
.send
(v
.force_get_primitive_method
("item", iter
.mtype
), [iter
]).as(not null)
1255 v
.frame
.map
[self.variables
[1]] = item
1259 v
.stmt
(self.n_block
)
1260 if v
.is_break
(self.escapemark
) then return
1261 v
.is_continue
(self.escapemark
) # Clear the break
1262 if v
.is_escaping
then return
1263 v
.send
(v
.force_get_primitive_method
("next", iter
.mtype
), [iter
])
1268 redef class AAssertExpr
1271 var cond
= v
.expr
(self.n_expr
)
1272 if cond
== null then return
1273 if not cond
.is_true
then
1275 if v
.is_escaping
then return
1278 fatal
(v
, "Assert '{nid.text}' failed")
1280 fatal
(v
, "Assert failed")
1290 var cond
= v
.expr
(self.n_expr
)
1291 if cond
== null then return null
1292 if cond
.is_true
then return cond
1293 return v
.expr
(self.n_expr2
)
1297 redef class AAndExpr
1300 var cond
= v
.expr
(self.n_expr
)
1301 if cond
== null then return null
1302 if not cond
.is_true
then return cond
1303 return v
.expr
(self.n_expr2
)
1307 redef class ANotExpr
1310 var cond
= v
.expr
(self.n_expr
)
1311 if cond
== null then return null
1312 return v
.bool_instance
(not cond
.is_true
)
1316 redef class AOrElseExpr
1319 var i
= v
.expr
(self.n_expr
)
1320 if i
== null then return null
1321 if i
!= v
.null_instance
then return i
1322 return v
.expr
(self.n_expr2
)
1329 var i
= v
.expr
(self.n_expr
)
1330 if i
== null then return null
1331 var i2
= v
.expr
(self.n_expr2
)
1332 if i2
== null then return null
1333 return v
.bool_instance
(i
.eq_is
(i2
))
1337 redef class AIntExpr
1340 return v
.int_instance
(self.value
.as(not null))
1344 redef class AFloatExpr
1347 return v
.float_instance
(self.value
.as(not null))
1351 redef class ACharExpr
1354 return v
.char_instance
(self.value
.as(not null))
1358 redef class AArrayExpr
1361 var val
= new Array[Instance]
1362 for nexpr
in self.n_exprs
.n_exprs
do
1363 var i
= v
.expr
(nexpr
)
1364 if i
== null then return null
1367 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1368 var elttype
= mtype
.arguments
.first
1369 return v
.array_instance
(val
, elttype
)
1373 redef class AStringFormExpr
1376 var txt
= self.value
.as(not null)
1377 var nat
= v
.native_string_instance
(txt
)
1378 var res
= new MutableInstance(v
.mainmodule
.get_primitive_class
("String").mclass_type
)
1379 v
.init_instance
(res
)
1380 v
.send
(v
.force_get_primitive_method
("from_cstring", res
.mtype
), [res
, nat
])
1381 v
.check_init_instance
(res
)
1386 redef class ASuperstringExpr
1389 var array
= new Array[Instance]
1390 for nexpr
in n_exprs
do
1391 var i
= v
.expr
(nexpr
)
1392 if i
== null then return null
1395 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1396 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1402 redef class ACrangeExpr
1405 var e1
= v
.expr
(self.n_expr
)
1406 if e1
== null then return null
1407 var e2
= v
.expr
(self.n_expr2
)
1408 if e2
== null then return null
1409 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1410 var res
= new MutableInstance(mtype
)
1411 v
.init_instance
(res
)
1412 v
.send
(v
.force_get_primitive_method
("init", mtype
), [res
, e1
, e2
])
1413 v
.check_init_instance
(res
)
1418 redef class AOrangeExpr
1421 var e1
= v
.expr
(self.n_expr
)
1422 if e1
== null then return null
1423 var e2
= v
.expr
(self.n_expr2
)
1424 if e2
== null then return null
1425 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1426 var res
= new MutableInstance(mtype
)
1427 v
.init_instance
(res
)
1428 v
.send
(v
.force_get_primitive_method
("without_last", mtype
), [res
, e1
, e2
])
1429 v
.check_init_instance
(res
)
1434 redef class ATrueExpr
1437 return v
.bool_instance
(true)
1441 redef class AFalseExpr
1444 return v
.bool_instance
(false)
1448 redef class ANullExpr
1451 return v
.null_instance
1455 redef class AIsaExpr
1458 var i
= v
.expr
(self.n_expr
)
1459 if i
== null then return null
1460 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1461 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1465 redef class AAsCastExpr
1468 var i
= v
.expr
(self.n_expr
)
1469 if i
== null then return null
1470 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1471 if not v
.is_subtype
(i
.mtype
, mtype
) then
1472 #fatal(v, "Cast failed expected {mtype}, got {i}")
1473 fatal
(v
, "Cast failed")
1479 redef class AAsNotnullExpr
1482 var i
= v
.expr
(self.n_expr
)
1483 if i
== null then return null
1484 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1485 if i
.mtype
isa MNullType then
1486 fatal
(v
, "Cast failed")
1492 redef class AParExpr
1495 return v
.expr
(self.n_expr
)
1499 redef class AOnceExpr
1502 if v
.onces
.has_key
(self) then
1503 return v
.onces
[self]
1505 var res
= v
.expr
(self.n_expr
)
1506 if res
== null then return null
1513 redef class ASendExpr
1516 var recv
= v
.expr
(self.n_expr
)
1517 if recv
== null then return null
1519 for a
in self.raw_arguments
.as(not null) do
1521 if i
== null then return null
1524 for c
in self.n_closure_defs
do
1525 var mtype
= c
.mclosure
.mtype
1526 var instance
= new ClosureInstance(mtype
, v
.frame
, c
)
1529 var mproperty
= self.mproperty
.as(not null)
1531 var res
= v
.send
(mproperty
, args
)
1532 if v
.is_break
(self.escapemark
) then
1534 v
.escapevalue
= null
1540 redef class ASendReassignFormExpr
1543 var recv
= v
.expr
(self.n_expr
)
1544 if recv
== null then return
1546 for a
in self.raw_arguments
.as(not null) do
1548 if i
== null then return
1551 var value
= v
.expr
(self.n_value
)
1552 if value
== null then return
1554 var mproperty
= self.mproperty
.as(not null)
1555 var read
= v
.send
(mproperty
, args
)
1558 var write
= v
.send
(self.reassign_property
.mproperty
, [read
, value
])
1559 assert write
!= null
1563 v
.send
(self.write_mproperty
.as(not null), args
)
1567 redef class ASuperExpr
1570 var recv
= v
.frame
.arguments
.first
1572 for a
in self.n_args
.n_exprs
do
1574 if i
== null then return null
1577 if args
.length
== 1 then
1578 args
= v
.frame
.arguments
1581 var mproperty
= self.mproperty
1582 if mproperty
!= null then
1583 if mproperty
.intro
.msignature
.arity
== 0 then
1587 var res
= v
.send
(mproperty
, args
)
1591 # stantard call-next-method
1592 var mpropdef
= v
.frame
.mpropdef
1593 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1594 assert mpropdef
isa MMethodDef
1595 var res
= v
.call
(mpropdef
, args
)
1600 redef class ANewExpr
1603 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1604 var recv
: Instance = new MutableInstance(mtype
)
1605 v
.init_instance
(recv
)
1607 for a
in self.n_args
.n_exprs
do
1609 if i
== null then return null
1612 var mproperty
= self.mproperty
.as(not null)
1613 var res2
= v
.send
(mproperty
, args
)
1614 if res2
!= null then
1615 #self.debug("got {res2} from {mproperty}. drop {recv}")
1618 v
.check_init_instance
(recv
)
1623 redef class AAttrExpr
1626 var recv
= v
.expr
(self.n_expr
)
1627 if recv
== null then return null
1628 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1629 var mproperty
= self.mproperty
.as(not null)
1630 return v
.read_attribute
(mproperty
, recv
)
1634 redef class AAttrAssignExpr
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 i
= v
.expr
(self.n_value
)
1641 if i
== null then return
1642 var mproperty
= self.mproperty
.as(not null)
1643 assert recv
isa MutableInstance
1644 recv
.attributes
[mproperty
] = i
1648 redef class AAttrReassignExpr
1651 var recv
= v
.expr
(self.n_expr
)
1652 if recv
== null then return
1653 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1654 var value
= v
.expr
(self.n_value
)
1655 if value
== null then return
1656 var mproperty
= self.mproperty
.as(not null)
1657 var attr
= v
.read_attribute
(mproperty
, recv
)
1658 var res
= v
.send
(reassign_property
.mproperty
, [attr
, value
])
1660 assert recv
isa MutableInstance
1661 recv
.attributes
[mproperty
] = res
1665 redef class AIssetAttrExpr
1668 var recv
= v
.expr
(self.n_expr
)
1669 if recv
== null then return null
1670 if recv
.mtype
isa MNullType then fatal
(v
, "Reciever is null")
1671 var mproperty
= self.mproperty
.as(not null)
1672 assert recv
isa MutableInstance
1673 return v
.bool_instance
(recv
.attributes
.has_key
(mproperty
))
1677 redef class AClosureCallExpr
1680 var args
= new Array[Instance]
1681 for a
in self.n_args
.n_exprs
do
1683 if i
== null then return null
1686 var i
= v
.frame
.map
[self.variable
.as(not null)]
1687 assert i
isa ClosureInstance
1688 var res
= v
.call_closure
(i
, args
)
1693 redef class ADebugTypeExpr