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 private import parser
::tables
24 import primitive_types
26 redef class ToolContext
27 # --discover-call-trace
28 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of methods", "--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 interpreter
.start
(mainmodule
)
53 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
57 # The visitor that interprets the Nit Program by walking on the AST
58 class NaiveInterpreter
59 # The modelbuilder that know the AST and its associations with the model
60 var modelbuilder
: ModelBuilder
62 # The main module of the program (used to lookup method)
63 var mainmodule
: MModule
65 # The command line arguments of the interpreted program
66 # arguments.first is the program name
67 # arguments[1] is the first argument
68 var arguments
: Array[String]
70 # The main Sys instance
71 var mainobj
: nullable Instance is noinit
75 if mainmodule
.model
.get_mclasses_by_name
("Bool") != null then
76 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
77 init_instance_primitive
(self.true_instance
)
78 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
79 init_instance_primitive
(self.false_instance
)
81 self.null_instance
= new PrimitiveInstance[nullable Object](mainmodule
.model
.null_type
, null)
84 # Starts the interpreter on the main module of a program
85 fun start
(mainmodule
: MModule) do
86 var interpreter
= self
87 var sys_type
= mainmodule
.sys_type
88 if sys_type
== null then return # no class Sys
89 var mainobj
= new MutableInstance(sys_type
)
90 interpreter
.mainobj
= mainobj
91 interpreter
.init_instance
(mainobj
)
92 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
93 if initprop
!= null then
94 interpreter
.send
(initprop
, [mainobj
])
96 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
97 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
98 if mainprop
!= null then
99 interpreter
.send
(mainprop
, [mainobj
])
103 # Subtype test in the context of the mainmodule
104 fun is_subtype
(sub
, sup
: MType): Bool
106 return sub
.is_subtype
(self.mainmodule
, current_receiver_class
, sup
)
109 # Get a primitive method in the context of the main module
110 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
112 assert recv
isa MClassType
113 return self.modelbuilder
.force_get_primitive_method
(current_node
, name
, recv
.mclass
, self.mainmodule
)
116 # Is a return, a break or a continue executed?
117 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
118 var escapemark
: nullable EscapeMark = null
120 # Is a return or a break or a continue executed?
121 # Use this function to know if you must skip the evaluation of statements
122 fun is_escaping
: Bool do return escapemark
!= null
124 # The value associated with the current return/break/continue, if any.
125 # Set the value when you set a escapemark.
126 # Read the value when you catch a mark or reach the end of a method
127 var escapevalue
: nullable Instance = null
129 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
130 # If there is no break/continue or if `escapemark` is null then return false.
131 # Use this function to catch a potential break/continue.
132 fun is_escape
(escapemark
: nullable EscapeMark): Bool
134 if escapemark
!= null and self.escapemark
== escapemark
then
135 self.escapemark
= null
142 # Evaluate `n` as an expression in the current context.
143 # Return the value of the expression.
144 # If `n` cannot be evaluated, then aborts.
145 fun expr
(n
: AExpr): nullable Instance
147 var frame
= self.frame
148 var old
= frame
.current_node
149 frame
.current_node
= n
150 #n.debug("IN Execute expr")
152 if i
== null and not self.is_escaping
then
153 n
.debug
("inconsitance: no value and not escaping.")
155 var implicit_cast_to
= n
.implicit_cast_to
156 if i
!= null and implicit_cast_to
!= null then
157 var mtype
= self.unanchor_type
(implicit_cast_to
)
158 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
161 #n.debug("OUT Execute expr: value is {i}")
162 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
163 frame
.current_node
= old
167 # Evaluate `n` as a statement in the current context.
168 # Do nothing if `n` is null.
169 # If `n` cannot be evaluated, then aborts.
170 fun stmt
(n
: nullable AExpr)
172 if n
== null then return
174 if n
.comprehension
!= null then
175 var comprehension
= frame
.comprehension
.as(not null)
177 if i
!= null then comprehension
.add
(i
)
181 var frame
= self.frame
182 var old
= frame
.current_node
183 frame
.current_node
= n
185 frame
.current_node
= old
188 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
189 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
191 # Return the boolean instance associated with `val`.
192 fun bool_instance
(val
: Bool): Instance
194 if val
then return self.true_instance
else return self.false_instance
197 # Return the integer instance associated with `val`.
198 fun int_instance
(val
: Int): Instance
200 var t
= mainmodule
.int_type
201 var instance
= new PrimitiveInstance[Int](t
, val
)
202 init_instance_primitive
(instance
)
206 # Return the byte instance associated with `val`.
207 fun byte_instance
(val
: Byte): Instance
209 var t
= mainmodule
.byte_type
210 var instance
= new PrimitiveInstance[Byte](t
, val
)
211 init_instance_primitive
(instance
)
215 # Return the int8 instance associated with `val`.
216 fun int8_instance
(val
: Int8): Instance
218 var t
= mainmodule
.int8_type
219 var instance
= new PrimitiveInstance[Int8](t
, val
)
220 init_instance_primitive
(instance
)
224 # Return the int16 instance associated with `val`.
225 fun int16_instance
(val
: Int16): Instance
227 var t
= mainmodule
.int16_type
228 var instance
= new PrimitiveInstance[Int16](t
, val
)
229 init_instance_primitive
(instance
)
233 # Return the uint16 instance associated with `val`.
234 fun uint16_instance
(val
: UInt16): Instance
236 var t
= mainmodule
.uint16_type
237 var instance
= new PrimitiveInstance[UInt16](t
, val
)
238 init_instance_primitive
(instance
)
242 # Return the int32 instance associated with `val`.
243 fun int32_instance
(val
: Int32): Instance
245 var t
= mainmodule
.int32_type
246 var instance
= new PrimitiveInstance[Int32](t
, val
)
247 init_instance_primitive
(instance
)
251 # Return the uint32 instance associated with `val`.
252 fun uint32_instance
(val
: UInt32): Instance
254 var t
= mainmodule
.uint32_type
255 var instance
= new PrimitiveInstance[UInt32](t
, val
)
256 init_instance_primitive
(instance
)
260 # Return the char instance associated with `val`.
261 fun char_instance
(val
: Char): Instance
263 var t
= mainmodule
.char_type
264 var instance
= new PrimitiveInstance[Char](t
, val
)
265 init_instance_primitive
(instance
)
269 # Return the float instance associated with `val`.
270 fun float_instance
(val
: Float): Instance
272 var t
= mainmodule
.float_type
273 var instance
= new PrimitiveInstance[Float](t
, val
)
274 init_instance_primitive
(instance
)
278 # The unique instance of the `true` value.
279 var true_instance
: Instance is noinit
281 # The unique instance of the `false` value.
282 var false_instance
: Instance is noinit
284 # The unique instance of the `null` value.
285 var null_instance
: Instance is noinit
287 # Return a new array made of `values`.
288 # The dynamic type of the result is Array[elttype].
289 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
291 assert not elttype
.need_anchor
292 var nat
= new PrimitiveInstance[Array[Instance]](mainmodule
.native_array_type
(elttype
), values
)
293 init_instance_primitive
(nat
)
294 var mtype
= mainmodule
.array_type
(elttype
)
295 var res
= new MutableInstance(mtype
)
296 self.init_instance
(res
)
297 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
301 # Return a instance associated to a primitive class
302 # Current primitive classes are `Int`, `Bool`, and `String`
303 fun value_instance
(object
: Object): Instance
305 if object
isa Int then
306 return int_instance
(object
)
307 else if object
isa Bool then
308 return bool_instance
(object
)
309 else if object
isa String then
310 return string_instance
(object
)
316 # Return a new native string initialized with `txt`
317 fun native_string_instance
(txt
: String): Instance
319 var instance
= native_string_instance_len
(txt
.bytelen
+1)
320 var val
= instance
.val
321 val
[txt
.bytelen
] = 0u8
322 txt
.to_cstring
.copy_to
(val
, txt
.bytelen
, 0, 0)
327 # Return a new native string initialized with `txt`
328 fun native_string_instance_from_ns
(txt
: NativeString, len
: Int): Instance
330 var instance
= native_string_instance_len
(len
)
331 var val
= instance
.val
332 txt
.copy_to
(val
, len
, 0, 0)
337 # Return a new native string initialized of `length`
338 fun native_string_instance_len
(length
: Int): PrimitiveInstance[NativeString]
340 var val
= new NativeString(length
)
342 var t
= mainmodule
.native_string_type
343 var instance
= new PrimitiveInstance[NativeString](t
, val
)
344 init_instance_primitive
(instance
)
348 # Return a new String instance for `txt`
349 fun string_instance
(txt
: String): Instance
351 var nat
= native_string_instance
(txt
)
352 var res
= self.send
(self.force_get_primitive_method
("to_s_full", nat
.mtype
), [nat
, self.int_instance
(txt
.bytelen
), self.int_instance
(txt
.length
)])
357 # The virtual type of the frames used in the execution engine
360 # The current frame used to store local variables of the current method executed
361 fun frame
: FRAME do return frames
.first
363 # The stack of all frames. The first one is the current one.
364 var frames
= new List[FRAME]
366 # Return a stack trace. One line per function
367 fun stack_trace
: String
369 var b
= new FlatBuffer
370 b
.append
(",---- Stack trace -- - - -\n")
372 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
374 b
.append
("`------------------- - - -")
378 # The current node, used to print errors, debug and stack-traces
379 fun current_node
: nullable ANode
381 if frames
.is_empty
then return null
382 return frames
.first
.current_node
385 # The dynamic type of the current `self`
386 fun current_receiver_class
: MClassType
388 return frames
.first
.arguments
.first
.mtype
.as(MClassType)
391 # Initialize the environment for a call and return a new Frame
392 # *`node` The AST node
393 # *`mpropdef` The corresponding mpropdef
394 # *`args` Arguments of the call
395 fun new_frame
(node
: ANode, mpropdef
: MPropDef, args
: Array[Instance]): FRAME
397 return new InterpreterFrame(node
, mpropdef
, args
)
400 # Exit the program with a message
401 fun fatal
(message
: String)
403 var node
= current_node
407 node
.fatal
(self, message
)
412 # Debug on the current node
413 fun debug
(message
: String)
415 var node
= current_node
423 # Retrieve the value of the variable in the current frame
424 fun read_variable
(v
: Variable): Instance
426 var f
= frames
.first
.as(InterpreterFrame)
430 # Assign the value of the variable in the current frame
431 fun write_variable
(v
: Variable, value
: Instance)
433 var f
= frames
.first
.as(InterpreterFrame)
437 # Store known methods, used to trace methods as they are reached
438 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
440 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
441 # This method is used to manage varargs in signatures and returns the real array
442 # of instances to use in the call.
443 # Return `null` if one of the evaluation of the arguments return null.
444 fun varargize
(mpropdef
: MMethodDef, map
: nullable SignatureMap, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
446 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
447 var res
= new Array[Instance]
450 if msignature
.arity
== 0 then return res
453 assert args
.length
== msignature
.arity
else debug
("Expected {msignature.arity} args, got {args.length}")
455 var e
= self.expr
(ne
)
456 if e
== null then return null
462 # Eval in order of arguments, not parameters
463 var exprs
= new Array[Instance].with_capacity
(args
.length
)
465 var e
= self.expr
(ne
)
466 if e
== null then return null
471 # Fill `res` with the result of the evaluation according to the mapping
472 for i
in [0..msignature
.arity
[ do
473 var param
= msignature
.mparameters
[i
]
474 var j
= map
.map
.get_or_null
(i
)
477 res
.add
(null_instance
)
480 if param
.is_vararg
and args
[i
].vararg_decl
> 0 then
481 var vararg
= exprs
.sub
(j
, args
[i
].vararg_decl
)
482 var elttype
= param
.mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
483 var arg
= self.array_instance
(vararg
, elttype
)
492 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
493 # Return a value if `mpropdef` is a function, or null if it is a procedure.
494 # The call is direct/static. There is no message-sending/late-binding.
495 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
497 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
498 self.discover_call_trace
.add mpropdef
499 self.debug
("Discovered {mpropdef}")
501 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
503 # Look for the AST node that implements the property
504 var val
= mpropdef
.constant_value
506 var node
= modelbuilder
.mpropdef2node
(mpropdef
)
507 if mpropdef
.is_abstract
then
509 self.frames
.unshift new_frame
(node
, mpropdef
, args
)
511 fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{args.first.mtype}`")
515 if node
isa APropdef then
516 self.parameter_check
(node
, mpropdef
, args
)
517 return node
.call
(self, mpropdef
, args
)
518 else if node
isa AClassdef then
519 self.parameter_check
(node
, mpropdef
, args
)
520 return node
.call
(self, mpropdef
, args
)
521 else if node
!= null then
522 fatal
("Fatal Error: method {mpropdef} associated to unexpected AST node {node.location}")
524 else if val
!= null then
525 return value_instance
(val
)
527 fatal
("Fatal Error: method {mpropdef} not found in the AST")
532 # Execute type checks of covariant parameters
533 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
535 var msignature
= mpropdef
.msignature
.as(not null)
536 for i
in [0..msignature
.arity
[ do
537 var mp
= msignature
.mparameters
[i
]
539 # skip test for vararg since the array is instantiated with the correct polymorphic type
540 if mp
.is_vararg
then continue
542 # skip if the cast is not required
543 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
544 if not origmtype
.need_anchor
then continue
546 #print "{mpropdef}: {mpropdef.mproperty.intro.msignature.mparameters[i]}"
548 # get the parameter type
550 var anchor
= args
.first
.mtype
.as(MClassType)
551 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
552 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
553 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
558 # Common code for runtime injected calls and normal calls
559 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
561 if mtype
isa MNullType then
562 if mproperty
.name
== "==" or mproperty
.name
== "is_same_instance" then
563 return self.bool_instance
(args
[0] == args
[1])
564 else if mproperty
.name
== "!=" then
565 return self.bool_instance
(args
[0] != args
[1])
567 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
568 fatal
("Receiver is null")
573 # Execute a full `callsite` for given `args`
574 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
575 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
577 if callsite
== null then return null
578 var initializers
= callsite
.mpropdef
.initializers
579 if not initializers
.is_empty
then
580 var recv
= arguments
.first
582 for p
in initializers
do
583 if p
isa MMethod then
585 for x
in p
.intro
.msignature
.mparameters
do
586 args
.add arguments
[i
]
590 else if p
isa MAttribute then
591 assert recv
isa MutableInstance
592 write_attribute
(p
, recv
, arguments
[i
])
596 assert i
== arguments
.length
598 return send
(callsite
.mproperty
, [recv
])
600 return send
(callsite
.mproperty
, arguments
)
603 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
604 # Return a value if `mproperty` is a function, or null if it is a procedure.
605 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
606 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
608 var recv
= args
.first
609 var mtype
= recv
.mtype
610 var ret
= send_commons
(mproperty
, args
, mtype
)
611 if ret
!= null then return ret
612 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
613 return self.call
(propdef
, args
)
616 # Read the attribute `mproperty` of an instance `recv` and return its value.
617 # If the attribute in not yet initialized, then aborts with an error message.
618 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
620 assert recv
isa MutableInstance
621 if not recv
.attributes
.has_key
(mproperty
) then
622 fatal
("Uninitialized attribute {mproperty.name}")
625 return recv
.attributes
[mproperty
]
628 # Replace in `recv` the value of the attribute `mproperty` by `value`
629 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
631 assert recv
isa MutableInstance
632 recv
.attributes
[mproperty
] = value
635 # Is the attribute `mproperty` initialized the instance `recv`?
636 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
638 assert recv
isa MutableInstance
639 return recv
.attributes
.has_key
(mproperty
)
642 # Collect attributes of a type in the order of their init
643 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
645 var cache
= self.collect_attr_propdef_cache
646 if cache
.has_key
(mtype
) then return cache
[mtype
]
648 var res
= new Array[AAttrPropdef]
649 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
650 self.mainmodule
.linearize_mclassdefs
(cds
)
652 res
.add_all
(modelbuilder
.collect_attr_propdef
(cd
))
659 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
661 # Fill the initial values of the newly created instance `recv`.
662 # `recv.mtype` is used to know what must be filled.
663 fun init_instance
(recv
: Instance)
665 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
666 npropdef
.init_expr
(self, recv
)
670 # A hook to initialize a `PrimitiveInstance`
671 fun init_instance_primitive
(recv
: Instance) do end
673 # This function determines the correct type according to the receiver of the current propdef (self).
674 fun unanchor_type
(mtype
: MType): MType
676 return mtype
.anchor_to
(self.mainmodule
, current_receiver_class
)
679 # Placebo instance used to mark internal error result when `null` already have a meaning.
680 # TODO: replace with multiple return or something better
681 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
684 # An instance represents a value of the executed program.
685 abstract class Instance
686 # The dynamic type of the instance
687 # ASSERT: not self.mtype.is_anchored
690 # return true if the instance is the true value.
691 # return false if the instance is the true value.
693 fun is_true
: Bool do abort
695 # Return true if `self` IS `o` (using the Nit semantic of is)
696 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
698 # Human readable object identity "Type#number"
699 redef fun to_s
do return "{mtype}"
701 # Return the integer value if the instance is an integer.
703 fun to_i
: Int do abort
705 # Return the integer value if the instance is a float.
707 fun to_f
: Float do abort
709 # Return the integer value if the instance is a byte.
711 fun to_b
: Byte do abort
713 # Return the integer value if the instance is a int8.
715 fun to_i8
: Int8 do abort
717 # Return the integer value if the instance is a int16.
719 fun to_i16
: Int16 do abort
721 # Return the integer value if the instance is a uint16.
723 fun to_u16
: UInt16 do abort
725 # Return the integer value if the instance is a int32.
727 fun to_i32
: Int32 do abort
729 # Return the integer value if the instance is a uint32.
731 fun to_u32
: UInt32 do abort
733 # The real value encapsulated if the instance is primitive.
735 fun val
: nullable Object do abort
738 # A instance with attribute (standards objects)
739 class MutableInstance
742 # The values of the attributes
743 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
746 # Special instance to handle primitives values (int, bool, etc.)
747 # The trick it just to encapsulate the <<real>> value
748 class PrimitiveInstance[E
]
751 # The real value encapsulated
756 if val
== true then return true
757 if val
== false then return false
763 if not o
isa PrimitiveInstance[nullable Object] then return false
764 return self.val
== o
.val
769 if not o
isa PrimitiveInstance[nullable Object] then return false
770 return self.val
.is_same_instance
(o
.val
)
773 redef fun to_s
do return "{mtype}#{val.object_id}({val or else "null"})"
775 redef fun to_i
do return val
.as(Int)
777 redef fun to_f
do return val
.as(Float)
779 redef fun to_b
do return val
.as(Byte)
781 redef fun to_i8
do return val
.as(Int8)
783 redef fun to_i16
do return val
.as(Int16)
785 redef fun to_u16
do return val
.as(UInt16)
787 redef fun to_i32
do return val
.as(Int32)
789 redef fun to_u32
do return val
.as(UInt32)
792 # Information about local variables in a running method
794 # The current visited node
795 # The node is stored by frame to keep a stack trace
796 var current_node
: ANode
797 # The executed property.
798 # A Method in case of a call, an attribute in case of a default initialization.
799 var mpropdef
: MPropDef
800 # Arguments of the method (the first is the receiver)
801 var arguments
: Array[Instance]
802 # Indicate if the expression has an array comprehension form
803 var comprehension
: nullable Array[Instance] = null
806 # Implementation of a Frame with a Hashmap to store local variables
807 class InterpreterFrame
810 # Mapping between a variable and the current value
811 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
815 # Aborts the program with a message
816 # `v` is used to know if a colored message is displayed or not
817 fun fatal
(v
: NaiveInterpreter, message
: String)
819 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
820 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
822 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
823 sys
.stderr
.write
(v
.stack_trace
)
824 sys
.stderr
.write
("\n")
831 # Execute a `mpropdef` associated with the current node.
832 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
834 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
839 redef class AMethPropdef
842 redef fun call
(v
, mpropdef
, args
)
844 var f
= v
.new_frame
(self, mpropdef
, args
)
845 var res
= call_commons
(v
, mpropdef
, args
, f
)
847 if v
.is_escape
(self.return_mark
) then
854 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
858 for i
in [0..mpropdef
.msignature
.arity
[ do
859 var variable
= self.n_signature
.n_params
[i
].variable
860 assert variable
!= null
861 v
.write_variable
(variable
, arguments
[i
+1])
864 # Call the implicit super-init
865 var auto_super_inits
= self.auto_super_inits
866 if auto_super_inits
!= null then
867 var args
= [arguments
.first
]
868 for auto_super_init
in auto_super_inits
do
870 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
871 args
.add
(arguments
[i
])
873 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
874 v
.callsite
(auto_super_init
, args
)
877 if auto_super_call
then
878 # standard call-next-method
879 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
880 v
.call
(superpd
, arguments
)
884 if mpropdef
.is_intern
or mpropdef
.is_extern
then
885 var res
= intern_call
(v
, mpropdef
, arguments
)
886 if res
!= v
.error_instance
then return res
889 if mpropdef
.is_extern
then
890 var res
= call_extern
(v
, mpropdef
, arguments
, f
)
891 if res
!= v
.error_instance
then return res
894 if n_block
!= null then
899 # Fail if nothing succeed
900 if mpropdef
.is_intern
then
901 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
902 else if mpropdef
.is_extern
then
903 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
905 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
910 # Call this extern method
911 protected fun call_extern
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
913 return v
.error_instance
916 # Interprets a intern or a shortcut extern method.
917 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
918 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
920 var pname
= mpropdef
.mproperty
.name
921 var cname
= mpropdef
.mclassdef
.mclass
.name
922 if pname
== "output" then
923 var recv
= args
.first
926 else if pname
== "object_id" then
927 var recv
= args
.first
928 if recv
isa PrimitiveInstance[Object] then
929 return v
.int_instance
(recv
.val
.object_id
)
931 return v
.int_instance
(recv
.object_id
)
933 else if pname
== "output_class_name" then
934 var recv
= args
.first
937 else if pname
== "native_class_name" then
938 var recv
= args
.first
939 var txt
= recv
.mtype
.to_s
940 return v
.native_string_instance
(txt
)
941 else if pname
== "==" then
942 # == is correctly redefined for instances
943 return v
.bool_instance
(args
[0] == args
[1])
944 else if pname
== "!=" then
945 return v
.bool_instance
(args
[0] != args
[1])
946 else if pname
== "is_same_type" then
947 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
948 else if pname
== "is_same_instance" then
949 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
950 else if pname
== "exit" then
953 else if pname
== "buffer_mode_full" then
954 return v
.int_instance
(sys
.buffer_mode_full
)
955 else if pname
== "buffer_mode_line" then
956 return v
.int_instance
(sys
.buffer_mode_line
)
957 else if pname
== "buffer_mode_none" then
958 return v
.int_instance
(sys
.buffer_mode_none
)
959 else if pname
== "sys" then
961 else if cname
== "Int" then
962 var recvval
= args
[0].to_i
963 if pname
== "unary -" then
964 return v
.int_instance
(-recvval
)
965 else if pname
== "unary +" then
967 else if pname
== "+" then
968 return v
.int_instance
(recvval
+ args
[1].to_i
)
969 else if pname
== "-" then
970 return v
.int_instance
(recvval
- args
[1].to_i
)
971 else if pname
== "*" then
972 return v
.int_instance
(recvval
* args
[1].to_i
)
973 else if pname
== "%" then
974 return v
.int_instance
(recvval
% args
[1].to_i
)
975 else if pname
== "/" then
976 return v
.int_instance
(recvval
/ args
[1].to_i
)
977 else if pname
== "<" then
978 return v
.bool_instance
(recvval
< args
[1].to_i
)
979 else if pname
== ">" then
980 return v
.bool_instance
(recvval
> args
[1].to_i
)
981 else if pname
== "<=" then
982 return v
.bool_instance
(recvval
<= args
[1].to_i
)
983 else if pname
== ">=" then
984 return v
.bool_instance
(recvval
>= args
[1].to_i
)
985 else if pname
== "<=>" then
986 return v
.int_instance
(recvval
<=> args
[1].to_i
)
987 else if pname
== "&" then
988 return v
.int_instance
(recvval
& args
[1].to_i
)
989 else if pname
== "|" then
990 return v
.int_instance
(recvval
| args
[1].to_i
)
991 else if pname
== "to_f" then
992 return v
.float_instance
(recvval
.to_f
)
993 else if pname
== "to_b" then
994 return v
.byte_instance
(recvval
.to_b
)
995 else if pname
== "<<" then
996 return v
.int_instance
(recvval
<< args
[1].to_i
)
997 else if pname
== ">>" then
998 return v
.int_instance
(recvval
>> args
[1].to_i
)
999 else if pname
== "to_i8" then
1000 return v
.int8_instance
(recvval
.to_i8
)
1001 else if pname
== "to_i16" then
1002 return v
.int16_instance
(recvval
.to_i16
)
1003 else if pname
== "to_u16" then
1004 return v
.uint16_instance
(recvval
.to_u16
)
1005 else if pname
== "to_i32" then
1006 return v
.int32_instance
(recvval
.to_i32
)
1007 else if pname
== "to_u32" then
1008 return v
.uint32_instance
(recvval
.to_u32
)
1010 else if cname
== "Byte" then
1011 var recvval
= args
[0].to_b
1012 if pname
== "unary -" then
1013 return v
.byte_instance
(-recvval
)
1014 else if pname
== "unary +" then
1016 else if pname
== "+" then
1017 return v
.byte_instance
(recvval
+ args
[1].to_b
)
1018 else if pname
== "-" then
1019 return v
.byte_instance
(recvval
- args
[1].to_b
)
1020 else if pname
== "*" then
1021 return v
.byte_instance
(recvval
* args
[1].to_b
)
1022 else if pname
== "%" then
1023 return v
.byte_instance
(recvval
% args
[1].to_b
)
1024 else if pname
== "/" then
1025 return v
.byte_instance
(recvval
/ args
[1].to_b
)
1026 else if pname
== "<" then
1027 return v
.bool_instance
(recvval
< args
[1].to_b
)
1028 else if pname
== ">" then
1029 return v
.bool_instance
(recvval
> args
[1].to_b
)
1030 else if pname
== "<=" then
1031 return v
.bool_instance
(recvval
<= args
[1].to_b
)
1032 else if pname
== ">=" then
1033 return v
.bool_instance
(recvval
>= args
[1].to_b
)
1034 else if pname
== "<=>" then
1035 return v
.int_instance
(recvval
<=> args
[1].to_b
)
1036 else if pname
== "&" then
1037 return v
.byte_instance
(recvval
& args
[1].to_b
)
1038 else if pname
== "|" then
1039 return v
.byte_instance
(recvval
| args
[1].to_b
)
1040 else if pname
== "to_f" then
1041 return v
.float_instance
(recvval
.to_f
)
1042 else if pname
== "to_i" then
1043 return v
.int_instance
(recvval
.to_i
)
1044 else if pname
== "<<" then
1045 return v
.byte_instance
(recvval
<< args
[1].to_i
)
1046 else if pname
== ">>" then
1047 return v
.byte_instance
(recvval
>> args
[1].to_i
)
1048 else if pname
== "to_i8" then
1049 return v
.int8_instance
(recvval
.to_i8
)
1050 else if pname
== "to_i16" then
1051 return v
.int16_instance
(recvval
.to_i16
)
1052 else if pname
== "to_u16" then
1053 return v
.uint16_instance
(recvval
.to_u16
)
1054 else if pname
== "to_i32" then
1055 return v
.int32_instance
(recvval
.to_i32
)
1056 else if pname
== "to_u32" then
1057 return v
.uint32_instance
(recvval
.to_u32
)
1058 else if pname
== "byte_to_s_len" then
1059 return v
.int_instance
(recvval
.to_s
.length
)
1061 else if cname
== "Char" then
1062 var recv
= args
[0].val
.as(Char)
1063 if pname
== "successor" then
1064 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
1065 else if pname
== "predecessor" then
1066 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
1067 else if pname
== "<" then
1068 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
1069 else if pname
== ">" then
1070 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
1071 else if pname
== "<=" then
1072 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
1073 else if pname
== ">=" then
1074 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
1075 else if pname
== "<=>" then
1076 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
1078 else if cname
== "Float" then
1079 var recv
= args
[0].to_f
1080 if pname
== "unary -" then
1081 return v
.float_instance
(-recv
)
1082 else if pname
== "unary +" then
1084 else if pname
== "+" then
1085 return v
.float_instance
(recv
+ args
[1].to_f
)
1086 else if pname
== "-" then
1087 return v
.float_instance
(recv
- args
[1].to_f
)
1088 else if pname
== "*" then
1089 return v
.float_instance
(recv
* args
[1].to_f
)
1090 else if pname
== "/" then
1091 return v
.float_instance
(recv
/ args
[1].to_f
)
1092 else if pname
== "<" then
1093 return v
.bool_instance
(recv
< args
[1].to_f
)
1094 else if pname
== ">" then
1095 return v
.bool_instance
(recv
> args
[1].to_f
)
1096 else if pname
== "<=" then
1097 return v
.bool_instance
(recv
<= args
[1].to_f
)
1098 else if pname
== ">=" then
1099 return v
.bool_instance
(recv
>= args
[1].to_f
)
1100 else if pname
== "to_i" then
1101 return v
.int_instance
(recv
.to_i
)
1102 else if pname
== "to_b" then
1103 return v
.byte_instance
(recv
.to_b
)
1104 else if pname
== "to_i8" then
1105 return v
.int8_instance
(recv
.to_i8
)
1106 else if pname
== "to_i16" then
1107 return v
.int16_instance
(recv
.to_i16
)
1108 else if pname
== "to_u16" then
1109 return v
.uint16_instance
(recv
.to_u16
)
1110 else if pname
== "to_i32" then
1111 return v
.int32_instance
(recv
.to_i32
)
1112 else if pname
== "to_u32" then
1113 return v
.uint32_instance
(recv
.to_u32
)
1114 else if pname
== "cos" then
1115 return v
.float_instance
(args
[0].to_f
.cos
)
1116 else if pname
== "sin" then
1117 return v
.float_instance
(args
[0].to_f
.sin
)
1118 else if pname
== "tan" then
1119 return v
.float_instance
(args
[0].to_f
.tan
)
1120 else if pname
== "acos" then
1121 return v
.float_instance
(args
[0].to_f
.acos
)
1122 else if pname
== "asin" then
1123 return v
.float_instance
(args
[0].to_f
.asin
)
1124 else if pname
== "atan" then
1125 return v
.float_instance
(args
[0].to_f
.atan
)
1126 else if pname
== "sqrt" then
1127 return v
.float_instance
(args
[0].to_f
.sqrt
)
1128 else if pname
== "exp" then
1129 return v
.float_instance
(args
[0].to_f
.exp
)
1130 else if pname
== "log" then
1131 return v
.float_instance
(args
[0].to_f
.log
)
1132 else if pname
== "pow" then
1133 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
1134 else if pname
== "abs" then
1135 return v
.float_instance
(args
[0].to_f
.abs
)
1136 else if pname
== "hypot_with" then
1137 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
1138 else if pname
== "is_nan" then
1139 return v
.bool_instance
(args
[0].to_f
.is_nan
)
1140 else if pname
== "is_inf_extern" then
1141 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
1142 else if pname
== "round" then
1143 return v
.float_instance
(args
[0].to_f
.round
)
1145 else if cname
== "NativeString" then
1146 if pname
== "new" then
1147 return v
.native_string_instance_len
(args
[1].to_i
)
1149 var recvval
= args
.first
.val
.as(NativeString)
1150 if pname
== "[]" then
1151 var arg1
= args
[1].to_i
1152 return v
.byte_instance
(recvval
[arg1
])
1153 else if pname
== "[]=" then
1154 var arg1
= args
[1].to_i
1155 recvval
[arg1
] = args
[2].val
.as(Byte)
1157 else if pname
== "copy_to" then
1158 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
1159 var destval
= args
[1].val
.as(NativeString)
1160 var lenval
= args
[2].to_i
1161 var fromval
= args
[3].to_i
1162 var toval
= args
[4].to_i
1163 recvval
.copy_to
(destval
, lenval
, fromval
, toval
)
1165 else if pname
== "atoi" then
1166 return v
.int_instance
(recvval
.atoi
)
1167 else if pname
== "fast_cstring" then
1168 var ns
= recvval
.fast_cstring
(args
[1].to_i
)
1169 return v
.native_string_instance
(ns
.to_s
)
1170 else if pname
== "fetch_4_chars" then
1171 return v
.int_instance
(args
[0].val
.as(NativeString).fetch_4_chars
(args
[1].to_i
))
1172 else if pname
== "fetch_4_hchars" then
1173 return v
.int_instance
(args
[0].val
.as(NativeString).fetch_4_hchars
(args
[1].to_i
))
1174 else if pname
== "utf8_length" then
1175 return v
.int_instance
(args
[0].val
.as(NativeString).utf8_length
(args
[1].to_i
, args
[2].to_i
))
1177 else if pname
== "calloc_string" then
1178 return v
.native_string_instance_len
(args
[1].to_i
)
1179 else if cname
== "NativeArray" then
1180 if pname
== "new" then
1181 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1182 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
1183 v
.init_instance_primitive
(instance
)
1186 var recvval
= args
.first
.val
.as(Array[Instance])
1187 if pname
== "[]" then
1188 return recvval
[args
[1].to_i
]
1189 else if pname
== "[]=" then
1190 recvval
[args
[1].to_i
] = args
[2]
1192 else if pname
== "length" then
1193 return v
.int_instance
(recvval
.length
)
1194 else if pname
== "copy_to" then
1195 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1198 else if cname
== "Int8" then
1199 var recvval
= args
[0].to_i8
1200 if pname
== "unary -" then
1201 return v
.int8_instance
(-recvval
)
1202 else if pname
== "unary +" then
1204 else if pname
== "+" then
1205 return v
.int8_instance
(recvval
+ args
[1].to_i8
)
1206 else if pname
== "-" then
1207 return v
.int8_instance
(recvval
- args
[1].to_i8
)
1208 else if pname
== "*" then
1209 return v
.int8_instance
(recvval
* args
[1].to_i8
)
1210 else if pname
== "%" then
1211 return v
.int8_instance
(recvval
% args
[1].to_i8
)
1212 else if pname
== "/" then
1213 return v
.int8_instance
(recvval
/ args
[1].to_i8
)
1214 else if pname
== "<" then
1215 return v
.bool_instance
(recvval
< args
[1].to_i8
)
1216 else if pname
== ">" then
1217 return v
.bool_instance
(recvval
> args
[1].to_i8
)
1218 else if pname
== "<=" then
1219 return v
.bool_instance
(recvval
<= args
[1].to_i8
)
1220 else if pname
== ">=" then
1221 return v
.bool_instance
(recvval
>= args
[1].to_i8
)
1222 else if pname
== "<=>" then
1223 return v
.int_instance
(recvval
<=> args
[1].to_i8
)
1224 else if pname
== "to_f" then
1225 return v
.float_instance
(recvval
.to_f
)
1226 else if pname
== "to_i" then
1227 return v
.int_instance
(recvval
.to_i
)
1228 else if pname
== "to_b" then
1229 return v
.byte_instance
(recvval
.to_b
)
1230 else if pname
== "to_i16" then
1231 return v
.int16_instance
(recvval
.to_i16
)
1232 else if pname
== "to_u16" then
1233 return v
.uint16_instance
(recvval
.to_u16
)
1234 else if pname
== "to_i32" then
1235 return v
.int32_instance
(recvval
.to_i32
)
1236 else if pname
== "to_u32" then
1237 return v
.uint32_instance
(recvval
.to_u32
)
1238 else if pname
== "<<" then
1239 return v
.int8_instance
(recvval
<< (args
[1].to_i
))
1240 else if pname
== ">>" then
1241 return v
.int8_instance
(recvval
>> (args
[1].to_i
))
1242 else if pname
== "&" then
1243 return v
.int8_instance
(recvval
& args
[1].to_i8
)
1244 else if pname
== "|" then
1245 return v
.int8_instance
(recvval
| args
[1].to_i8
)
1246 else if pname
== "^" then
1247 return v
.int8_instance
(recvval ^ args
[1].to_i8
)
1248 else if pname
== "unary ~" then
1249 return v
.int8_instance
(~recvval
)
1251 else if cname
== "Int16" then
1252 var recvval
= args
[0].to_i16
1253 if pname
== "unary -" then
1254 return v
.int16_instance
(-recvval
)
1255 else if pname
== "unary +" then
1257 else if pname
== "+" then
1258 return v
.int16_instance
(recvval
+ args
[1].to_i16
)
1259 else if pname
== "-" then
1260 return v
.int16_instance
(recvval
- args
[1].to_i16
)
1261 else if pname
== "*" then
1262 return v
.int16_instance
(recvval
* args
[1].to_i16
)
1263 else if pname
== "%" then
1264 return v
.int16_instance
(recvval
% args
[1].to_i16
)
1265 else if pname
== "/" then
1266 return v
.int16_instance
(recvval
/ args
[1].to_i16
)
1267 else if pname
== "<" then
1268 return v
.bool_instance
(recvval
< args
[1].to_i16
)
1269 else if pname
== ">" then
1270 return v
.bool_instance
(recvval
> args
[1].to_i16
)
1271 else if pname
== "<=" then
1272 return v
.bool_instance
(recvval
<= args
[1].to_i16
)
1273 else if pname
== ">=" then
1274 return v
.bool_instance
(recvval
>= args
[1].to_i16
)
1275 else if pname
== "<=>" then
1276 return v
.int_instance
(recvval
<=> args
[1].to_i16
)
1277 else if pname
== "to_f" then
1278 return v
.float_instance
(recvval
.to_f
)
1279 else if pname
== "to_i" then
1280 return v
.int_instance
(recvval
.to_i
)
1281 else if pname
== "to_b" then
1282 return v
.byte_instance
(recvval
.to_b
)
1283 else if pname
== "to_i8" then
1284 return v
.int8_instance
(recvval
.to_i8
)
1285 else if pname
== "to_u16" then
1286 return v
.uint16_instance
(recvval
.to_u16
)
1287 else if pname
== "to_i32" then
1288 return v
.int32_instance
(recvval
.to_i32
)
1289 else if pname
== "to_u32" then
1290 return v
.uint32_instance
(recvval
.to_u32
)
1291 else if pname
== "<<" then
1292 return v
.int16_instance
(recvval
<< (args
[1].to_i
))
1293 else if pname
== ">>" then
1294 return v
.int16_instance
(recvval
>> (args
[1].to_i
))
1295 else if pname
== "&" then
1296 return v
.int16_instance
(recvval
& args
[1].to_i16
)
1297 else if pname
== "|" then
1298 return v
.int16_instance
(recvval
| args
[1].to_i16
)
1299 else if pname
== "^" then
1300 return v
.int16_instance
(recvval ^ args
[1].to_i16
)
1301 else if pname
== "unary ~" then
1302 return v
.int16_instance
(~recvval
)
1304 else if cname
== "UInt16" then
1305 var recvval
= args
[0].to_u16
1306 if pname
== "unary -" then
1307 return v
.uint16_instance
(-recvval
)
1308 else if pname
== "unary +" then
1310 else if pname
== "+" then
1311 return v
.uint16_instance
(recvval
+ args
[1].to_u16
)
1312 else if pname
== "-" then
1313 return v
.uint16_instance
(recvval
- args
[1].to_u16
)
1314 else if pname
== "*" then
1315 return v
.uint16_instance
(recvval
* args
[1].to_u16
)
1316 else if pname
== "%" then
1317 return v
.uint16_instance
(recvval
% args
[1].to_u16
)
1318 else if pname
== "/" then
1319 return v
.uint16_instance
(recvval
/ args
[1].to_u16
)
1320 else if pname
== "<" then
1321 return v
.bool_instance
(recvval
< args
[1].to_u16
)
1322 else if pname
== ">" then
1323 return v
.bool_instance
(recvval
> args
[1].to_u16
)
1324 else if pname
== "<=" then
1325 return v
.bool_instance
(recvval
<= args
[1].to_u16
)
1326 else if pname
== ">=" then
1327 return v
.bool_instance
(recvval
>= args
[1].to_u16
)
1328 else if pname
== "<=>" then
1329 return v
.int_instance
(recvval
<=> args
[1].to_u16
)
1330 else if pname
== "to_f" then
1331 return v
.float_instance
(recvval
.to_f
)
1332 else if pname
== "to_i" then
1333 return v
.int_instance
(recvval
.to_i
)
1334 else if pname
== "to_b" then
1335 return v
.byte_instance
(recvval
.to_b
)
1336 else if pname
== "to_i8" then
1337 return v
.int8_instance
(recvval
.to_i8
)
1338 else if pname
== "to_i16" then
1339 return v
.int16_instance
(recvval
.to_i16
)
1340 else if pname
== "to_i32" then
1341 return v
.int32_instance
(recvval
.to_i32
)
1342 else if pname
== "to_u32" then
1343 return v
.uint32_instance
(recvval
.to_u32
)
1344 else if pname
== "<<" then
1345 return v
.uint16_instance
(recvval
<< (args
[1].to_i
))
1346 else if pname
== ">>" then
1347 return v
.uint16_instance
(recvval
>> (args
[1].to_i
))
1348 else if pname
== "&" then
1349 return v
.uint16_instance
(recvval
& args
[1].to_u16
)
1350 else if pname
== "|" then
1351 return v
.uint16_instance
(recvval
| args
[1].to_u16
)
1352 else if pname
== "^" then
1353 return v
.uint16_instance
(recvval ^ args
[1].to_u16
)
1354 else if pname
== "unary ~" then
1355 return v
.uint16_instance
(~recvval
)
1357 else if cname
== "Int32" then
1358 var recvval
= args
[0].to_i32
1359 if pname
== "unary -" then
1360 return v
.int32_instance
(-recvval
)
1361 else if pname
== "unary +" then
1363 else if pname
== "+" then
1364 return v
.int32_instance
(recvval
+ args
[1].to_i32
)
1365 else if pname
== "-" then
1366 return v
.int32_instance
(recvval
- args
[1].to_i32
)
1367 else if pname
== "*" then
1368 return v
.int32_instance
(recvval
* args
[1].to_i32
)
1369 else if pname
== "%" then
1370 return v
.int32_instance
(recvval
% args
[1].to_i32
)
1371 else if pname
== "/" then
1372 return v
.int32_instance
(recvval
/ args
[1].to_i32
)
1373 else if pname
== "<" then
1374 return v
.bool_instance
(recvval
< args
[1].to_i32
)
1375 else if pname
== ">" then
1376 return v
.bool_instance
(recvval
> args
[1].to_i32
)
1377 else if pname
== "<=" then
1378 return v
.bool_instance
(recvval
<= args
[1].to_i32
)
1379 else if pname
== ">=" then
1380 return v
.bool_instance
(recvval
>= args
[1].to_i32
)
1381 else if pname
== "<=>" then
1382 return v
.int_instance
(recvval
<=> args
[1].to_i32
)
1383 else if pname
== "to_f" then
1384 return v
.float_instance
(recvval
.to_f
)
1385 else if pname
== "to_i" then
1386 return v
.int_instance
(recvval
.to_i
)
1387 else if pname
== "to_b" then
1388 return v
.byte_instance
(recvval
.to_b
)
1389 else if pname
== "to_i8" then
1390 return v
.int8_instance
(recvval
.to_i8
)
1391 else if pname
== "to_i16" then
1392 return v
.int16_instance
(recvval
.to_i16
)
1393 else if pname
== "to_u16" then
1394 return v
.uint16_instance
(recvval
.to_u16
)
1395 else if pname
== "to_u32" then
1396 return v
.uint32_instance
(recvval
.to_u32
)
1397 else if pname
== "<<" then
1398 return v
.int32_instance
(recvval
<< (args
[1].to_i
))
1399 else if pname
== ">>" then
1400 return v
.int32_instance
(recvval
>> (args
[1].to_i
))
1401 else if pname
== "&" then
1402 return v
.int32_instance
(recvval
& args
[1].to_i32
)
1403 else if pname
== "|" then
1404 return v
.int32_instance
(recvval
| args
[1].to_i32
)
1405 else if pname
== "^" then
1406 return v
.int32_instance
(recvval ^ args
[1].to_i32
)
1407 else if pname
== "unary ~" then
1408 return v
.int32_instance
(~recvval
)
1410 else if cname
== "UInt32" then
1411 var recvval
= args
[0].to_u32
1412 if pname
== "unary -" then
1413 return v
.uint32_instance
(-recvval
)
1414 else if pname
== "unary +" then
1416 else if pname
== "+" then
1417 return v
.uint32_instance
(recvval
+ args
[1].to_u32
)
1418 else if pname
== "-" then
1419 return v
.uint32_instance
(recvval
- args
[1].to_u32
)
1420 else if pname
== "*" then
1421 return v
.uint32_instance
(recvval
* args
[1].to_u32
)
1422 else if pname
== "%" then
1423 return v
.uint32_instance
(recvval
% args
[1].to_u32
)
1424 else if pname
== "/" then
1425 return v
.uint32_instance
(recvval
/ args
[1].to_u32
)
1426 else if pname
== "<" then
1427 return v
.bool_instance
(recvval
< args
[1].to_u32
)
1428 else if pname
== ">" then
1429 return v
.bool_instance
(recvval
> args
[1].to_u32
)
1430 else if pname
== "<=" then
1431 return v
.bool_instance
(recvval
<= args
[1].to_u32
)
1432 else if pname
== ">=" then
1433 return v
.bool_instance
(recvval
>= args
[1].to_u32
)
1434 else if pname
== "<=>" then
1435 return v
.int_instance
(recvval
<=> args
[1].to_u32
)
1436 else if pname
== "to_f" then
1437 return v
.float_instance
(recvval
.to_f
)
1438 else if pname
== "to_i" then
1439 return v
.int_instance
(recvval
.to_i
)
1440 else if pname
== "to_b" then
1441 return v
.byte_instance
(recvval
.to_b
)
1442 else if pname
== "to_i8" then
1443 return v
.int8_instance
(recvval
.to_i8
)
1444 else if pname
== "to_i16" then
1445 return v
.int16_instance
(recvval
.to_i16
)
1446 else if pname
== "to_u16" then
1447 return v
.uint16_instance
(recvval
.to_u16
)
1448 else if pname
== "to_i32" then
1449 return v
.int32_instance
(recvval
.to_i32
)
1450 else if pname
== "<<" then
1451 return v
.uint32_instance
(recvval
<< (args
[1].to_i
))
1452 else if pname
== ">>" then
1453 return v
.uint32_instance
(recvval
>> (args
[1].to_i
))
1454 else if pname
== "&" then
1455 return v
.uint32_instance
(recvval
& args
[1].to_u32
)
1456 else if pname
== "|" then
1457 return v
.uint32_instance
(recvval
| args
[1].to_u32
)
1458 else if pname
== "^" then
1459 return v
.uint32_instance
(recvval ^ args
[1].to_u32
)
1460 else if pname
== "unary ~" then
1461 return v
.uint32_instance
(~recvval
)
1463 else if pname
== "native_argc" then
1464 return v
.int_instance
(v
.arguments
.length
)
1465 else if pname
== "native_argv" then
1466 var txt
= v
.arguments
[args
[1].to_i
]
1467 return v
.native_string_instance
(txt
)
1468 else if pname
== "native_argc" then
1469 return v
.int_instance
(v
.arguments
.length
)
1470 else if pname
== "native_argv" then
1471 var txt
= v
.arguments
[args
[1].to_i
]
1472 return v
.native_string_instance
(txt
)
1473 else if pname
== "lexer_goto" then
1474 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1475 else if pname
== "lexer_accept" then
1476 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1477 else if pname
== "parser_goto" then
1478 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1479 else if pname
== "parser_action" then
1480 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1482 return v
.error_instance
1486 redef class AAttrPropdef
1487 redef fun call
(v
, mpropdef
, args
)
1489 var recv
= args
.first
1490 assert recv
isa MutableInstance
1491 var attr
= self.mpropdef
.mproperty
1492 if mpropdef
== mreadpropdef
then
1493 assert args
.length
== 1
1494 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1495 var f
= v
.new_frame
(self, mpropdef
, args
)
1496 return evaluate_expr
(v
, recv
, f
)
1497 else if mpropdef
== mwritepropdef
then
1498 assert args
.length
== 2
1500 if is_optional
and arg
.mtype
isa MNullType then
1501 var f
= v
.new_frame
(self, mpropdef
, args
)
1502 arg
= evaluate_expr
(v
, recv
, f
)
1504 v
.write_attribute
(attr
, recv
, arg
)
1511 # Evaluate and set the default value of the attribute in `recv`
1512 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1514 if is_lazy
then return
1516 var f
= v
.new_frame
(self, mreadpropdef
.as(not null), [recv
])
1517 evaluate_expr
(v
, recv
, f
)
1520 var mpropdef
= self.mpropdef
1521 if mpropdef
== null then return
1522 var mtype
= self.mtype
.as(not null)
1523 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1524 if mtype
isa MNullableType then
1525 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1529 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance, f
: Frame): Instance
1531 assert recv
isa MutableInstance
1536 var nexpr
= self.n_expr
1537 var nblock
= self.n_block
1538 if nexpr
!= null then
1540 else if nblock
!= null then
1542 assert v
.escapemark
== return_mark
1551 assert not v
.is_escaping
1552 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1557 redef class AClassdef
1558 # Execute an implicit `mpropdef` associated with the current node.
1559 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance]): nullable Instance
1561 if mpropdef
.mproperty
.is_root_init
then
1562 assert arguments
.length
== 1
1563 if not mpropdef
.is_intro
then
1564 # standard call-next-method
1565 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
1566 v
.call
(superpd
, arguments
)
1576 # Evaluate the node as a possible expression.
1577 # Return a possible value
1578 # NOTE: Do not call this method directly, but use `v.expr`
1579 # This method is here to be implemented by subclasses.
1580 protected fun expr
(v
: NaiveInterpreter): nullable Instance
1582 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1586 # Evaluate the node as a statement.
1587 # NOTE: Do not call this method directly, but use `v.stmt`
1588 # This method is here to be implemented by subclasses (no need to return something).
1589 protected fun stmt
(v
: NaiveInterpreter)
1596 redef class ABlockExpr
1599 var last
= self.n_expr
.last
1600 for e
in self.n_expr
do
1601 if e
== last
then break
1603 if v
.is_escaping
then return null
1610 for e
in self.n_expr
do
1612 if v
.is_escaping
then return
1617 redef class AVardeclExpr
1620 var ne
= self.n_expr
1623 if i
== null then return null
1624 v
.write_variable
(self.variable
.as(not null), i
)
1631 redef class AVarExpr
1634 return v
.read_variable
(self.variable
.as(not null))
1638 redef class AVarAssignExpr
1641 var i
= v
.expr
(self.n_value
)
1642 if i
== null then return null
1643 v
.write_variable
(self.variable
.as(not null), i
)
1648 redef class AVarReassignExpr
1651 var variable
= self.variable
.as(not null)
1652 var vari
= v
.read_variable
(variable
)
1653 var value
= v
.expr
(self.n_value
)
1654 if value
== null then return
1655 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1657 v
.write_variable
(variable
, res
)
1661 redef class ASelfExpr
1664 return v
.frame
.arguments
.first
1668 redef class AImplicitSelfExpr
1671 if not is_sys
then return super
1676 redef class AEscapeExpr
1679 var ne
= self.n_expr
1682 if i
== null then return
1685 v
.escapemark
= self.escapemark
1689 redef class AAbortExpr
1700 var cond
= v
.expr
(self.n_expr
)
1701 if cond
== null then return null
1702 if cond
.is_true
then
1703 return v
.expr
(self.n_then
.as(not null))
1705 return v
.expr
(self.n_else
.as(not null))
1711 var cond
= v
.expr
(self.n_expr
)
1712 if cond
== null then return
1713 if cond
.is_true
then
1721 redef class AIfexprExpr
1724 var cond
= v
.expr
(self.n_expr
)
1725 if cond
== null then return null
1726 if cond
.is_true
then
1727 return v
.expr
(self.n_then
)
1729 return v
.expr
(self.n_else
)
1737 v
.stmt
(self.n_block
)
1738 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1742 redef class AWhileExpr
1746 var cond
= v
.expr
(self.n_expr
)
1747 if cond
== null then return
1748 if not cond
.is_true
then return
1749 v
.stmt
(self.n_block
)
1750 if v
.is_escape
(self.break_mark
) then return
1751 v
.is_escape
(self.continue_mark
) # Clear the break
1752 if v
.is_escaping
then return
1757 redef class ALoopExpr
1761 v
.stmt
(self.n_block
)
1762 if v
.is_escape
(self.break_mark
) then return
1763 v
.is_escape
(self.continue_mark
) # Clear the break
1764 if v
.is_escaping
then return
1769 redef class AForExpr
1772 var iters
= new Array[Instance]
1774 for g
in n_groups
do
1775 var col
= v
.expr
(g
.n_expr
)
1776 if col
== null then return
1777 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1779 var iter
= v
.callsite
(g
.method_iterator
, [col
]).as(not null)
1784 for g
in n_groups
, iter
in iters
do
1785 var isok
= v
.callsite
(g
.method_is_ok
, [iter
]).as(not null)
1786 if not isok
.is_true
then break label
1787 if g
.variables
.length
== 1 then
1788 var item
= v
.callsite
(g
.method_item
, [iter
]).as(not null)
1789 #self.debug("item {item}")
1790 v
.write_variable
(g
.variables
.first
, item
)
1791 else if g
.variables
.length
== 2 then
1792 var key
= v
.callsite
(g
.method_key
, [iter
]).as(not null)
1793 v
.write_variable
(g
.variables
[0], key
)
1794 var item
= v
.callsite
(g
.method_item
, [iter
]).as(not null)
1795 v
.write_variable
(g
.variables
[1], item
)
1800 v
.stmt
(self.n_block
)
1801 if v
.is_escape
(self.break_mark
) then break
1802 v
.is_escape
(self.continue_mark
) # Clear the break
1803 if v
.is_escaping
then break
1804 for g
in n_groups
, iter
in iters
do
1805 v
.callsite
(g
.method_next
, [iter
])
1808 for g
in n_groups
, iter
in iters
do
1809 var method_finish
= g
.method_finish
1810 if method_finish
!= null then
1811 v
.callsite
(method_finish
, [iter
])
1817 redef class AWithExpr
1820 var expr
= v
.expr
(self.n_expr
)
1821 if expr
== null then return
1823 v
.callsite
(method_start
, [expr
])
1824 v
.stmt
(self.n_block
)
1825 v
.is_escape
(self.break_mark
) # Clear the break
1827 # Execute the finally without an escape
1828 var old_mark
= v
.escapemark
1830 v
.callsite
(method_finish
, [expr
])
1831 # Restore the escape unless another escape was provided
1832 if v
.escapemark
== null then v
.escapemark
= old_mark
1836 redef class AAssertExpr
1839 var cond
= v
.expr
(self.n_expr
)
1840 if cond
== null then return
1841 if not cond
.is_true
then
1843 if v
.is_escaping
then return
1846 fatal
(v
, "Assert '{nid.text}' failed")
1848 fatal
(v
, "Assert failed")
1858 var cond
= v
.expr
(self.n_expr
)
1859 if cond
== null then return null
1860 if cond
.is_true
then return cond
1861 return v
.expr
(self.n_expr2
)
1865 redef class AImpliesExpr
1868 var cond
= v
.expr
(self.n_expr
)
1869 if cond
== null then return null
1870 if not cond
.is_true
then return v
.true_instance
1871 return v
.expr
(self.n_expr2
)
1875 redef class AAndExpr
1878 var cond
= v
.expr
(self.n_expr
)
1879 if cond
== null then return null
1880 if not cond
.is_true
then return cond
1881 return v
.expr
(self.n_expr2
)
1885 redef class ANotExpr
1888 var cond
= v
.expr
(self.n_expr
)
1889 if cond
== null then return null
1890 return v
.bool_instance
(not cond
.is_true
)
1894 redef class AOrElseExpr
1897 var i
= v
.expr
(self.n_expr
)
1898 if i
== null then return null
1899 if i
!= v
.null_instance
then return i
1900 return v
.expr
(self.n_expr2
)
1904 redef class AIntegerExpr
1907 if value
isa Int then return v
.int_instance
(value
.as(Int))
1908 if value
isa Byte then return v
.byte_instance
(value
.as(Byte))
1909 if value
isa Int8 then return v
.int8_instance
(value
.as(Int8))
1910 if value
isa Int16 then return v
.int16_instance
(value
.as(Int16))
1911 if value
isa UInt16 then return v
.uint16_instance
(value
.as(UInt16))
1912 if value
isa Int32 then return v
.int32_instance
(value
.as(Int32))
1913 if value
isa UInt32 then return v
.uint32_instance
(value
.as(UInt32))
1918 redef class AFloatExpr
1921 return v
.float_instance
(self.value
.as(not null))
1925 redef class ACharExpr
1928 if is_ascii
then return v
.byte_instance
(self.value
.as(not null).ascii
)
1929 if is_code_point
then return v
.int_instance
(self.value
.as(not null).code_point
)
1930 return v
.char_instance
(self.value
.as(not null))
1934 redef class AArrayExpr
1937 var val
= new Array[Instance]
1938 var old_comprehension
= v
.frame
.comprehension
1939 v
.frame
.comprehension
= val
1940 for nexpr
in self.n_exprs
do
1941 if nexpr
isa AForExpr then
1944 var i
= v
.expr
(nexpr
)
1945 if i
== null then return null
1949 v
.frame
.comprehension
= old_comprehension
1950 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1951 var elttype
= mtype
.arguments
.first
1952 return v
.array_instance
(val
, elttype
)
1956 redef class AugmentedStringFormExpr
1957 # Factorize the making of a `Regex` object from a literal prefixed string
1958 fun make_re
(v
: NaiveInterpreter, rs
: Instance): nullable Instance do
1961 var res
= v
.callsite
(tore
, [rs
])
1963 print
"Cannot call property `to_re` on {self}"
1966 for j
in suffix
.chars
do
1968 var prop
= ignore_case
1970 v
.callsite
(prop
, [res
, v
.bool_instance
(true)])
1976 v
.callsite
(prop
, [res
, v
.bool_instance
(true)])
1982 v
.callsite
(prop
, [res
, v
.bool_instance
(false)])
1985 # Should not happen, this needs to be updated
1986 # along with the addition of new suffixes
1993 redef class AStringFormExpr
1994 redef fun expr
(v
) do return v
.string_instance
(value
)
1997 redef class AStringExpr
1998 redef fun expr
(v
) do
1999 var s
= v
.string_instance
(value
)
2000 if is_string
then return s
2001 if is_bytestring
then
2002 var ns
= v
.native_string_instance_from_ns
(bytes
.items
, bytes
.length
)
2003 var ln
= v
.int_instance
(bytes
.length
)
2004 var prop
= to_bytes_with_copy
2006 var res
= v
.callsite
(prop
, [ns
, ln
])
2008 print
"Cannot call property `to_bytes` on {self}"
2013 var res
= make_re
(v
, s
)
2017 print
"Unimplemented prefix or suffix for {self}"
2024 redef class ASuperstringExpr
2027 var array
= new Array[Instance]
2028 for nexpr
in n_exprs
do
2029 var i
= v
.expr
(nexpr
)
2030 if i
== null then return null
2033 var i
= v
.array_instance
(array
, v
.mainmodule
.object_type
)
2034 var res
= v
.send
(v
.force_get_primitive_method
("plain_to_s", i
.mtype
), [i
])
2036 if is_re
then res
= make_re
(v
, res
)
2041 redef class ACrangeExpr
2044 var e1
= v
.expr
(self.n_expr
)
2045 if e1
== null then return null
2046 var e2
= v
.expr
(self.n_expr2
)
2047 if e2
== null then return null
2048 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
2049 var res
= new MutableInstance(mtype
)
2050 v
.init_instance
(res
)
2051 v
.callsite
(init_callsite
, [res
, e1
, e2
])
2056 redef class AOrangeExpr
2059 var e1
= v
.expr
(self.n_expr
)
2060 if e1
== null then return null
2061 var e2
= v
.expr
(self.n_expr2
)
2062 if e2
== null then return null
2063 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
2064 var res
= new MutableInstance(mtype
)
2065 v
.init_instance
(res
)
2066 v
.callsite
(init_callsite
, [res
, e1
, e2
])
2071 redef class ATrueExpr
2074 return v
.bool_instance
(true)
2078 redef class AFalseExpr
2081 return v
.bool_instance
(false)
2085 redef class ANullExpr
2088 return v
.null_instance
2092 redef class AIsaExpr
2095 var i
= v
.expr
(self.n_expr
)
2096 if i
== null then return null
2097 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
2098 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
2102 redef class AAsCastExpr
2105 var i
= v
.expr
(self.n_expr
)
2106 if i
== null then return null
2107 var mtype
= self.mtype
.as(not null)
2108 var amtype
= v
.unanchor_type
(mtype
)
2109 if not v
.is_subtype
(i
.mtype
, amtype
) then
2110 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
2116 redef class AAsNotnullExpr
2119 var i
= v
.expr
(self.n_expr
)
2120 if i
== null then return null
2121 if i
.mtype
isa MNullType then
2122 fatal
(v
, "Cast failed")
2128 redef class AParExpr
2131 return v
.expr
(self.n_expr
)
2135 redef class AOnceExpr
2138 if v
.onces
.has_key
(self) then
2139 return v
.onces
[self]
2141 var res
= v
.expr
(self.n_expr
)
2142 if res
== null then return null
2149 redef class ASendExpr
2152 var recv
= v
.expr
(self.n_expr
)
2153 if recv
== null then return null
2154 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.raw_arguments
)
2155 if args
== null then return null
2157 var res
= v
.callsite
(callsite
, args
)
2162 redef class ASendReassignFormExpr
2165 var recv
= v
.expr
(self.n_expr
)
2166 if recv
== null then return
2167 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.raw_arguments
)
2168 if args
== null then return
2169 var value
= v
.expr
(self.n_value
)
2170 if value
== null then return
2172 var read
= v
.callsite
(callsite
, args
)
2175 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
2176 assert write
!= null
2180 v
.callsite
(write_callsite
, args
)
2184 redef class ASuperExpr
2187 var recv
= v
.frame
.arguments
.first
2189 var callsite
= self.callsite
2190 if callsite
!= null then
2192 if self.n_args
.n_exprs
.is_empty
then
2193 # Add automatic arguments for the super init call
2195 for i
in [0..callsite
.msignature
.arity
[ do
2196 args
.add
(v
.frame
.arguments
[i
+1])
2199 args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.n_args
.n_exprs
)
2200 if args
== null then return null
2204 var res
= v
.callsite
(callsite
, args
)
2208 # Standard call-next-method
2209 var mpropdef
= self.mpropdef
2210 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
2213 if self.n_args
.n_exprs
.is_empty
then
2214 args
= v
.frame
.arguments
2216 args
= v
.varargize
(mpropdef
, signaturemap
, recv
, self.n_args
.n_exprs
)
2217 if args
== null then return null
2220 var res
= v
.call
(mpropdef
, args
)
2225 redef class ANewExpr
2228 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
2229 var recv
: Instance = new MutableInstance(mtype
)
2230 v
.init_instance
(recv
)
2231 var callsite
= self.callsite
2232 if callsite
== null then return recv
2234 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.n_args
.n_exprs
)
2235 if args
== null then return null
2236 var res2
= v
.callsite
(callsite
, args
)
2237 if res2
!= null then
2238 #self.debug("got {res2} from {mproperty}. drop {recv}")
2245 redef class AAttrExpr
2248 var recv
= v
.expr
(self.n_expr
)
2249 if recv
== null then return null
2250 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
2251 var mproperty
= self.mproperty
.as(not null)
2252 return v
.read_attribute
(mproperty
, recv
)
2256 redef class AAttrAssignExpr
2259 var recv
= v
.expr
(self.n_expr
)
2260 if recv
== null then return
2261 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
2262 var i
= v
.expr
(self.n_value
)
2263 if i
== null then return
2264 var mproperty
= self.mproperty
.as(not null)
2265 v
.write_attribute
(mproperty
, recv
, i
)
2269 redef class AAttrReassignExpr
2272 var recv
= v
.expr
(self.n_expr
)
2273 if recv
== null then return
2274 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
2275 var value
= v
.expr
(self.n_value
)
2276 if value
== null then return
2277 var mproperty
= self.mproperty
.as(not null)
2278 var attr
= v
.read_attribute
(mproperty
, recv
)
2279 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
2281 v
.write_attribute
(mproperty
, recv
, res
)
2285 redef class AIssetAttrExpr
2288 var recv
= v
.expr
(self.n_expr
)
2289 if recv
== null then return null
2290 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
2291 var mproperty
= self.mproperty
.as(not null)
2292 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
2296 redef class AVarargExpr
2299 return v
.expr
(self.n_expr
)
2303 redef class ANamedargExpr
2306 return v
.expr
(self.n_expr
)
2310 redef class ADebugTypeExpr