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 a method", "--discover-call-trace")
33 self.option_context
.add_option
(self.opt_discover_call_trace
)
37 redef class ModelBuilder
38 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
39 # `arguments` are the command-line arguments in order
41 # 1. the AST is fully loaded.
42 # 2. the model is fully built.
43 # 3. the instructions are fully analysed.
44 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
47 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
49 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
50 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 executed?
117 # Set this mark to skip the evaluation until the end of the specified method frame
118 var returnmark
: nullable Frame = null
120 # Is a break or a continue executed?
121 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
122 var escapemark
: nullable EscapeMark = null
124 # Is a return or a break or a continue executed?
125 # Use this function to know if you must skip the evaluation of statements
126 fun is_escaping
: Bool do return returnmark
!= null or escapemark
!= null
128 # The value associated with the current return/break/continue, if any.
129 # Set the value when you set a escapemark.
130 # Read the value when you catch a mark or reach the end of a method
131 var escapevalue
: nullable Instance = null
133 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
134 # If there is no break/continue or if `escapemark` is null then return false.
135 # Use this function to catch a potential break/continue.
136 fun is_escape
(escapemark
: nullable EscapeMark): Bool
138 if escapemark
!= null and self.escapemark
== escapemark
then
139 self.escapemark
= null
146 # Evaluate `n` as an expression in the current context.
147 # Return the value of the expression.
148 # If `n` cannot be evaluated, then aborts.
149 fun expr
(n
: AExpr): nullable Instance
151 var frame
= self.frame
152 var old
= frame
.current_node
153 frame
.current_node
= n
154 #n.debug("IN Execute expr")
156 if i
== null and not self.is_escaping
then
157 n
.debug
("inconsitance: no value and not escaping.")
159 var implicit_cast_to
= n
.implicit_cast_to
160 if implicit_cast_to
!= null then
161 var mtype
= self.unanchor_type
(implicit_cast_to
)
162 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
165 #n.debug("OUT Execute expr: value is {i}")
166 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
167 frame
.current_node
= old
171 # Evaluate `n` as a statement in the current context.
172 # Do nothing if `n` is null.
173 # If `n` cannot be evaluated, then aborts.
174 fun stmt
(n
: nullable AExpr)
177 var frame
= self.frame
178 var old
= frame
.current_node
179 frame
.current_node
= n
180 #n.debug("Execute stmt")
182 frame
.current_node
= old
186 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
187 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
189 # Return the boolean instance associated with `val`.
190 fun bool_instance
(val
: Bool): Instance
192 if val
then return self.true_instance
else return self.false_instance
195 # Return the integer instance associated with `val`.
196 fun int_instance
(val
: Int): Instance
198 var ic
= get_primitive_class
("Int")
199 var instance
= new PrimitiveInstance[Int](ic
.mclass_type
, val
)
200 init_instance_primitive
(instance
)
204 # Return the char instance associated with `val`.
205 fun char_instance
(val
: Char): Instance
207 var ic
= get_primitive_class
("Char")
208 var instance
= new PrimitiveInstance[Char](ic
.mclass_type
, val
)
209 init_instance_primitive
(instance
)
213 # Return the float instance associated with `val`.
214 fun float_instance
(val
: Float): Instance
216 var ic
= get_primitive_class
("Float")
217 var instance
= new PrimitiveInstance[Float](ic
.mclass_type
, val
)
218 init_instance_primitive
(instance
)
222 # The unique instance of the `true` value.
223 var true_instance
: Instance is noinit
225 # The unique instance of the `false` value.
226 var false_instance
: Instance is noinit
228 # The unique instance of the `null` value.
229 var null_instance
: Instance is noinit
231 # Return a new array made of `values`.
232 # The dynamic type of the result is Array[elttype].
233 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
235 assert not elttype
.need_anchor
236 var nat
= new PrimitiveInstance[Array[Instance]](get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
237 init_instance_primitive
(nat
)
238 var mtype
= get_primitive_class
("Array").get_mtype
([elttype
])
239 var res
= new MutableInstance(mtype
)
240 self.init_instance
(res
)
241 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
245 # Return a instance associated to a primitive class
246 # Current primitive classes are `Int`, `Bool`, and `String`
247 fun value_instance
(object
: Object): Instance
249 if object
isa Int then
250 return int_instance
(object
)
251 else if object
isa Bool then
252 return bool_instance
(object
)
253 else if object
isa String then
254 return string_instance
(object
)
260 # Return a new native string initialized with `txt`
261 fun native_string_instance
(txt
: String): Instance
263 var val
= new FlatBuffer.from
(txt
)
265 var ic
= get_primitive_class
("NativeString")
266 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
267 init_instance_primitive
(instance
)
271 # Return a new String instance for `txt`
272 fun string_instance
(txt
: String): Instance
274 var nat
= native_string_instance
(txt
)
275 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
280 # The current frame used to store local variables of the current method executed
281 fun frame
: Frame do return frames
.first
283 # The stack of all frames. The first one is the current one.
284 var frames
= new List[Frame]
286 # Return a stack trace. One line per function
287 fun stack_trace
: String
289 var b
= new FlatBuffer
290 b
.append
(",---- Stack trace -- - - -\n")
292 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
294 b
.append
("`------------------- - - -")
298 # The current node, used to print errors, debug and stack-traces
299 fun current_node
: nullable ANode
301 if frames
.is_empty
then return null
302 return frames
.first
.current_node
305 # The dynamic type of the current `self`
306 fun current_receiver_class
: MClassType
308 return frames
.first
.arguments
.first
.mtype
.as(MClassType)
311 # Exit the program with a message
312 fun fatal
(message
: String)
314 var node
= current_node
318 node
.fatal
(self, message
)
323 # Debug on the current node
324 fun debug
(message
: String)
326 var node
= current_node
334 # Retrieve the value of the variable in the current frame
335 fun read_variable
(v
: Variable): Instance
341 # Assign the value of the variable in the current frame
342 fun write_variable
(v
: Variable, value
: Instance)
348 # Store known methods, used to trace methods as they are reached
349 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
351 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
352 # This method is used to manage varargs in signatures and returns the real array
353 # of instances to use in the call.
354 # Return `null` if one of the evaluation of the arguments return null.
355 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
357 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
358 var res
= new Array[Instance]
361 if args
.is_empty
then return res
363 var vararg_rank
= msignature
.vararg_rank
364 var vararg_len
= args
.length
- msignature
.arity
365 if vararg_len
< 0 then vararg_len
= 0
367 for i
in [0..msignature
.arity
[ do
368 if i
== vararg_rank
then
370 if ne
isa AVarargExpr then
371 var e
= self.expr
(ne
.n_expr
)
372 if e
== null then return null
376 var vararg
= new Array[Instance]
377 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
378 var e
= self.expr
(args
[j
])
379 if e
== null then return null
382 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
383 res
.add
(self.array_instance
(vararg
, elttype
))
386 if i
> vararg_rank
then j
+= vararg_len
387 var e
= self.expr
(args
[j
])
388 if e
== null then return null
395 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
396 # Return a value if `mpropdef` is a function, or null if it is a procedure.
397 # The call is direct/static. There is no message-sending/late-binding.
398 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
400 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
401 self.discover_call_trace
.add mpropdef
402 self.debug
("Discovered {mpropdef}")
404 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
406 # Look for the AST node that implements the property
407 var val
= mpropdef
.constant_value
409 var node
= modelbuilder
.mpropdef2node
(mpropdef
)
410 if node
isa APropdef then
411 self.parameter_check
(node
, mpropdef
, args
)
412 return node
.call
(self, mpropdef
, args
)
413 else if node
isa AClassdef then
414 self.parameter_check
(node
, mpropdef
, args
)
415 return node
.call
(self, mpropdef
, args
)
416 else if node
!= null then
417 fatal
("Fatal Error: method {mpropdef} associated to unexpected AST node {node.location}")
419 else if val
!= null then
420 return value_instance
(val
)
422 fatal
("Fatal Error: method {mpropdef} not found in the AST")
427 # Execute type checks of covariant parameters
428 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
430 var msignature
= mpropdef
.msignature
431 for i
in [0..msignature
.arity
[ do
432 # skip test for vararg since the array is instantiated with the correct polymorphic type
433 if msignature
.vararg_rank
== i
then continue
435 # skip if the cast is not required
436 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
437 if not origmtype
.need_anchor
then continue
439 #print "{mpropdef}: {mpropdef.mproperty.intro.msignature.mparameters[i]}"
441 # get the parameter type
442 var mtype
= msignature
.mparameters
[i
].mtype
443 var anchor
= args
.first
.mtype
.as(MClassType)
444 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
445 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
446 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
451 # Common code for runtime injected calls and normal calls
452 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
454 if mtype
isa MNullType then
455 if mproperty
.name
== "==" then
456 return self.bool_instance
(args
[0] == args
[1])
457 else if mproperty
.name
== "!=" then
458 return self.bool_instance
(args
[0] != args
[1])
460 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
461 fatal
("Receiver is null")
466 # Execute a full `callsite` for given `args`
467 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
468 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
470 var initializers
= callsite
.mpropdef
.initializers
471 if not initializers
.is_empty
then
472 var recv
= arguments
.first
474 for p
in initializers
do
475 if p
isa MMethod then
477 for x
in p
.intro
.msignature
.mparameters
do
478 args
.add arguments
[i
]
482 else if p
isa MAttribute then
483 assert recv
isa MutableInstance
484 write_attribute
(p
, recv
, arguments
[i
])
488 assert i
== arguments
.length
490 return send
(callsite
.mproperty
, [recv
])
492 return send
(callsite
.mproperty
, arguments
)
495 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
496 # Return a value if `mproperty` is a function, or null if it is a procedure.
497 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
498 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
500 var recv
= args
.first
501 var mtype
= recv
.mtype
502 var ret
= send_commons
(mproperty
, args
, mtype
)
503 if ret
!= null then return ret
504 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
505 return self.call
(propdef
, args
)
508 # Read the attribute `mproperty` of an instance `recv` and return its value.
509 # If the attribute in not yet initialized, then aborts with an error message.
510 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
512 assert recv
isa MutableInstance
513 if not recv
.attributes
.has_key
(mproperty
) then
514 fatal
("Uninitialized attribute {mproperty.name}")
517 return recv
.attributes
[mproperty
]
520 # Replace in `recv` the value of the attribute `mproperty` by `value`
521 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
523 assert recv
isa MutableInstance
524 recv
.attributes
[mproperty
] = value
527 # Is the attribute `mproperty` initialized the instance `recv`?
528 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
530 assert recv
isa MutableInstance
531 return recv
.attributes
.has_key
(mproperty
)
534 # Collect attributes of a type in the order of their init
535 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
537 var cache
= self.collect_attr_propdef_cache
538 if cache
.has_key
(mtype
) then return cache
[mtype
]
540 var res
= new Array[AAttrPropdef]
541 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
542 self.mainmodule
.linearize_mclassdefs
(cds
)
544 res
.add_all
(modelbuilder
.collect_attr_propdef
(cd
))
551 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
553 # Fill the initial values of the newly created instance `recv`.
554 # `recv.mtype` is used to know what must be filled.
555 fun init_instance
(recv
: Instance)
557 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
558 npropdef
.init_expr
(self, recv
)
562 # A hook to initialize a `PrimitiveInstance`
563 fun init_instance_primitive
(recv
: Instance) do end
565 # Return the primitive `MClass` corresponding to the `name` given in parameter
566 # `name` : name of the primitive class
567 fun get_primitive_class
(name
: String): MClass
569 return mainmodule
.get_primitive_class
(name
)
572 # This function determines the correct type according to the receiver of the current propdef (self).
573 fun unanchor_type
(mtype
: MType): MType
575 return mtype
.anchor_to
(self.mainmodule
, current_receiver_class
)
578 # Placebo instance used to mark internal error result when `null` already have a meaning.
579 # TODO: replace with multiple return or something better
580 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
583 # An instance represents a value of the executed program.
584 abstract class Instance
585 # The dynamic type of the instance
586 # ASSERT: not self.mtype.is_anchored
589 # return true if the instance is the true value.
590 # return false if the instance is the true value.
592 fun is_true
: Bool do abort
594 # Return true if `self` IS `o` (using the Nit semantic of is)
595 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
597 # Human readable object identity "Type#number"
598 redef fun to_s
do return "{mtype}"
600 # Return the integer value if the instance is an integer.
602 fun to_i
: Int do abort
604 # Return the integer value if the instance is a float.
606 fun to_f
: Float do abort
608 # The real value encapsulated if the instance is primitive.
610 fun val
: nullable Object do abort
613 # A instance with attribute (standards objects)
614 class MutableInstance
617 # The values of the attributes
618 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
621 # Special instance to handle primitives values (int, bool, etc.)
622 # The trick it just to encapsulate the <<real>> value
623 class PrimitiveInstance[E
]
626 # The real value encapsulated
631 if val
== true then return true
632 if val
== false then return false
638 if not o
isa PrimitiveInstance[nullable Object] then return false
639 return self.val
== o
.val
644 if not o
isa PrimitiveInstance[nullable Object] then return false
645 return self.val
.is_same_instance
(o
.val
)
648 redef fun to_s
do return "{mtype}#{val.object_id}({val or else "null"})"
650 redef fun to_i
do return val
.as(Int)
652 redef fun to_f
do return val
.as(Float)
655 # Information about local variables in a running method
657 # The current visited node
658 # The node is stored by frame to keep a stack trace
659 var current_node
: ANode
660 # The executed property.
661 # A Method in case of a call, an attribute in case of a default initialization.
662 var mpropdef
: MPropDef
663 # Arguments of the method (the first is the receiver)
664 var arguments
: Array[Instance]
665 # Mapping between a variable and the current value
666 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
670 # Aborts the program with a message
671 # `v` is used to know if a colored message is displayed or not
672 fun fatal
(v
: NaiveInterpreter, message
: String)
674 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
675 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
677 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
678 sys
.stderr
.write
(v
.stack_trace
)
679 sys
.stderr
.write
("\n")
686 # Execute a `mpropdef` associated with the current node.
687 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
689 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
694 redef class AMethPropdef
697 redef fun call
(v
, mpropdef
, args
)
699 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
700 var res
= call_commons
(v
, mpropdef
, args
, f
)
702 if v
.returnmark
== f
then
711 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
715 for i
in [0..mpropdef
.msignature
.arity
[ do
716 var variable
= self.n_signature
.n_params
[i
].variable
717 assert variable
!= null
718 v
.write_variable
(variable
, arguments
[i
+1])
721 if mpropdef
.is_abstract
then
722 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
726 # Call the implicit super-init
727 var auto_super_inits
= self.auto_super_inits
728 if auto_super_inits
!= null then
729 var args
= [arguments
.first
]
730 for auto_super_init
in auto_super_inits
do
732 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
733 args
.add
(arguments
[i
])
735 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
736 v
.callsite
(auto_super_init
, args
)
739 if auto_super_call
then
740 # standard call-next-method
741 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
742 v
.call
(superpd
, arguments
)
745 if mpropdef
.is_intern
or mpropdef
.is_extern
then
746 var res
= intern_call
(v
, mpropdef
, arguments
)
747 if res
!= v
.error_instance
then return res
750 if n_block
!= null then
755 if mpropdef
.is_intern
then
756 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
757 else if mpropdef
.is_extern
then
758 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
760 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
765 # Interprets a intern or a shortcut extern method.
766 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
767 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
769 var pname
= mpropdef
.mproperty
.name
770 var cname
= mpropdef
.mclassdef
.mclass
.name
771 if pname
== "output" then
772 var recv
= args
.first
775 else if pname
== "object_id" then
776 var recv
= args
.first
777 if recv
isa PrimitiveInstance[Object] then
778 return v
.int_instance
(recv
.val
.object_id
)
780 return v
.int_instance
(recv
.object_id
)
782 else if pname
== "output_class_name" then
783 var recv
= args
.first
786 else if pname
== "native_class_name" then
787 var recv
= args
.first
788 var txt
= recv
.mtype
.to_s
789 return v
.native_string_instance
(txt
)
790 else if pname
== "==" then
791 # == is correctly redefined for instances
792 return v
.bool_instance
(args
[0] == args
[1])
793 else if pname
== "!=" then
794 return v
.bool_instance
(args
[0] != args
[1])
795 else if pname
== "is_same_type" then
796 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
797 else if pname
== "is_same_instance" then
798 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
799 else if pname
== "exit" then
802 else if pname
== "buffer_mode_full" then
803 return v
.int_instance
(sys
.buffer_mode_full
)
804 else if pname
== "buffer_mode_line" then
805 return v
.int_instance
(sys
.buffer_mode_line
)
806 else if pname
== "buffer_mode_none" then
807 return v
.int_instance
(sys
.buffer_mode_none
)
808 else if pname
== "sys" then
810 else if cname
== "Int" then
811 var recvval
= args
[0].to_i
812 if pname
== "unary -" then
813 return v
.int_instance
(-args
[0].to_i
)
814 else if pname
== "+" then
815 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
816 else if pname
== "-" then
817 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
818 else if pname
== "*" then
819 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
820 else if pname
== "%" then
821 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
822 else if pname
== "/" then
823 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
824 else if pname
== "<" then
825 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
826 else if pname
== ">" then
827 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
828 else if pname
== "<=" then
829 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
830 else if pname
== ">=" then
831 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
832 else if pname
== "<=>" then
833 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
834 else if pname
== "ascii" then
835 return v
.char_instance
(args
[0].to_i
.ascii
)
836 else if pname
== "to_f" then
837 return v
.float_instance
(args
[0].to_i
.to_f
)
838 else if pname
== "lshift" then
839 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
840 else if pname
== "rshift" then
841 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
842 else if pname
== "rand" then
843 var res
= recvval
.rand
844 return v
.int_instance
(res
)
845 else if pname
== "bin_and" then
846 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
847 else if pname
== "bin_or" then
848 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
849 else if pname
== "bin_xor" then
850 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
851 else if pname
== "bin_not" then
852 return v
.int_instance
(args
[0].to_i
.bin_not
)
853 else if pname
== "native_int_to_s" then
854 return v
.native_string_instance
(recvval
.to_s
)
855 else if pname
== "strerror_ext" then
856 return v
.native_string_instance
(recvval
.strerror
)
858 else if cname
== "Char" then
859 var recv
= args
[0].val
.as(Char)
860 if pname
== "ascii" then
861 return v
.int_instance
(recv
.ascii
)
862 else if pname
== "successor" then
863 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
864 else if pname
== "predecessor" then
865 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
866 else if pname
== "<" then
867 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
868 else if pname
== ">" then
869 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
870 else if pname
== "<=" then
871 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
872 else if pname
== ">=" then
873 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
874 else if pname
== "<=>" then
875 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
877 else if cname
== "Float" then
878 var recv
= args
[0].to_f
879 if pname
== "unary -" then
880 return v
.float_instance
(-recv
)
881 else if pname
== "+" then
882 return v
.float_instance
(recv
+ args
[1].to_f
)
883 else if pname
== "-" then
884 return v
.float_instance
(recv
- args
[1].to_f
)
885 else if pname
== "*" then
886 return v
.float_instance
(recv
* args
[1].to_f
)
887 else if pname
== "/" then
888 return v
.float_instance
(recv
/ args
[1].to_f
)
889 else if pname
== "<" then
890 return v
.bool_instance
(recv
< args
[1].to_f
)
891 else if pname
== ">" then
892 return v
.bool_instance
(recv
> args
[1].to_f
)
893 else if pname
== "<=" then
894 return v
.bool_instance
(recv
<= args
[1].to_f
)
895 else if pname
== ">=" then
896 return v
.bool_instance
(recv
>= args
[1].to_f
)
897 else if pname
== "to_i" then
898 return v
.int_instance
(recv
.to_i
)
899 else if pname
== "cos" then
900 return v
.float_instance
(args
[0].to_f
.cos
)
901 else if pname
== "sin" then
902 return v
.float_instance
(args
[0].to_f
.sin
)
903 else if pname
== "tan" then
904 return v
.float_instance
(args
[0].to_f
.tan
)
905 else if pname
== "acos" then
906 return v
.float_instance
(args
[0].to_f
.acos
)
907 else if pname
== "asin" then
908 return v
.float_instance
(args
[0].to_f
.asin
)
909 else if pname
== "atan" then
910 return v
.float_instance
(args
[0].to_f
.atan
)
911 else if pname
== "sqrt" then
912 return v
.float_instance
(args
[0].to_f
.sqrt
)
913 else if pname
== "exp" then
914 return v
.float_instance
(args
[0].to_f
.exp
)
915 else if pname
== "log" then
916 return v
.float_instance
(args
[0].to_f
.log
)
917 else if pname
== "pow" then
918 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
919 else if pname
== "rand" then
920 return v
.float_instance
(args
[0].to_f
.rand
)
921 else if pname
== "abs" then
922 return v
.float_instance
(args
[0].to_f
.abs
)
923 else if pname
== "hypot_with" then
924 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
925 else if pname
== "is_nan" then
926 return v
.bool_instance
(args
[0].to_f
.is_nan
)
927 else if pname
== "is_inf_extern" then
928 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
929 else if pname
== "round" then
930 return v
.float_instance
(args
[0].to_f
.round
)
932 else if cname
== "NativeString" then
933 if pname
== "new" then
934 return v
.native_string_instance
("!" * args
[1].to_i
)
936 var recvval
= args
.first
.val
.as(Buffer)
937 if pname
== "[]" then
938 var arg1
= args
[1].to_i
939 if arg1
>= recvval
.length
or arg1
< 0 then
940 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
942 return v
.char_instance
(recvval
.chars
[arg1
])
943 else if pname
== "[]=" then
944 var arg1
= args
[1].to_i
945 if arg1
>= recvval
.length
or arg1
< 0 then
946 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
948 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
950 else if pname
== "copy_to" then
951 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
952 var destval
= args
[1].val
.as(FlatBuffer)
953 var lenval
= args
[2].to_i
954 var fromval
= args
[3].to_i
955 var toval
= args
[4].to_i
957 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
959 if fromval
+ lenval
>= recvval
.length
then
960 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
963 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
965 if toval
+ lenval
>= destval
.length
then
966 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
968 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
970 else if pname
== "atoi" then
971 return v
.int_instance
(recvval
.to_i
)
972 else if pname
== "file_exists" then
973 return v
.bool_instance
(recvval
.to_s
.file_exists
)
974 else if pname
== "file_mkdir" then
977 else if pname
== "file_chdir" then
980 else if pname
== "file_realpath" then
981 return v
.native_string_instance
(recvval
.to_s
.realpath
)
982 else if pname
== "get_environ" then
983 var txt
= recvval
.to_s
.environ
984 return v
.native_string_instance
(txt
)
985 else if pname
== "system" then
986 var res
= sys
.system
(recvval
.to_s
)
987 return v
.int_instance
(res
)
988 else if pname
== "atof" then
989 return v
.float_instance
(recvval
.to_f
)
991 else if cname
== "String" then
992 var cs
= v
.send
(v
.force_get_primitive_method
("to_cstring", args
.first
.mtype
), [args
.first
])
993 var str
= cs
.val
.to_s
994 if pname
== "files" then
995 var res
= new Array[Instance]
996 for f
in str
.files
do res
.add v
.string_instance
(f
)
997 return v
.array_instance
(res
, v
.get_primitive_class
("String").mclass_type
)
999 else if pname
== "calloc_string" then
1000 return v
.native_string_instance
("!" * args
[1].to_i
)
1001 else if cname
== "NativeArray" then
1002 if pname
== "new" then
1003 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1004 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
1005 v
.init_instance_primitive
(instance
)
1008 var recvval
= args
.first
.val
.as(Array[Instance])
1009 if pname
== "[]" then
1010 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
1011 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
1013 return recvval
[args
[1].to_i
]
1014 else if pname
== "[]=" then
1015 recvval
[args
[1].to_i
] = args
[2]
1017 else if pname
== "length" then
1018 return v
.int_instance
(recvval
.length
)
1019 else if pname
== "copy_to" then
1020 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1023 else if cname
== "NativeFile" then
1024 if pname
== "native_stdout" then
1025 var inst
= new PrimitiveNativeFile.native_stdout
1026 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1027 v
.init_instance_primitive
(instance
)
1029 else if pname
== "native_stdin" then
1030 var inst
= new PrimitiveNativeFile.native_stdin
1031 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1032 v
.init_instance_primitive
(instance
)
1034 else if pname
== "native_stderr" then
1035 var inst
= new PrimitiveNativeFile.native_stderr
1036 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1037 v
.init_instance_primitive
(instance
)
1039 else if pname
== "io_open_read" then
1040 var a1
= args
[1].val
.as(Buffer)
1041 var inst
= new PrimitiveNativeFile.io_open_read
(a1
.to_s
)
1042 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1043 v
.init_instance_primitive
(instance
)
1045 else if pname
== "io_open_write" then
1046 var a1
= args
[1].val
.as(Buffer)
1047 var inst
= new PrimitiveNativeFile.io_open_write
(a1
.to_s
)
1048 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1049 v
.init_instance_primitive
(instance
)
1052 var recvval
= args
.first
.val
1053 if pname
== "io_write" then
1054 var a1
= args
[1].val
.as(Buffer)
1055 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_write
(a1
.to_cstring
, args
[2].to_i
))
1056 else if pname
== "io_read" then
1057 var a1
= args
[1].val
.as(Buffer)
1058 var ns
= new NativeString(a1
.length
)
1059 var len
= recvval
.as(PrimitiveNativeFile).io_read
(ns
, args
[2].to_i
)
1061 a1
.append
(ns
.to_s_with_length
(len
))
1062 return v
.int_instance
(len
)
1063 else if pname
== "flush" then
1064 recvval
.as(PrimitiveNativeFile).flush
1066 else if pname
== "io_close" then
1067 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_close
)
1068 else if pname
== "set_buffering_type" then
1069 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).set_buffering_type
(args
[1].to_i
, args
[2].to_i
))
1071 else if pname
== "calloc_array" then
1072 var recvtype
= args
.first
.mtype
.as(MClassType)
1074 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1075 mtype
= mtype
.arguments
.first
1076 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1077 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1078 v
.init_instance_primitive
(instance
)
1080 else if pname
== "native_argc" then
1081 return v
.int_instance
(v
.arguments
.length
)
1082 else if pname
== "native_argv" then
1083 var txt
= v
.arguments
[args
[1].to_i
]
1084 return v
.native_string_instance
(txt
)
1085 else if pname
== "native_argc" then
1086 return v
.int_instance
(v
.arguments
.length
)
1087 else if pname
== "native_argv" then
1088 var txt
= v
.arguments
[args
[1].to_i
]
1089 return v
.native_string_instance
(txt
)
1090 else if pname
== "get_time" then
1091 return v
.int_instance
(get_time
)
1092 else if pname
== "srand" then
1095 else if pname
== "srand_from" then
1096 srand_from
(args
[1].to_i
)
1098 else if pname
== "atan2" then
1099 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1100 else if pname
== "pi" then
1101 return v
.float_instance
(pi
)
1102 else if pname
== "lexer_goto" then
1103 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1104 else if pname
== "lexer_accept" then
1105 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1106 else if pname
== "parser_goto" then
1107 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1108 else if pname
== "parser_action" then
1109 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1110 else if pname
== "file_getcwd" then
1111 return v
.native_string_instance
(getcwd
)
1112 else if pname
== "errno" then
1113 return v
.int_instance
(sys
.errno
)
1114 else if pname
== "address_is_null" then
1116 if recv
isa PrimitiveInstance[PrimitiveNativeFile] then
1117 return v
.bool_instance
(recv
.val
.address_is_null
)
1119 return v
.false_instance
1121 return v
.error_instance
1125 redef class AAttrPropdef
1126 redef fun call
(v
, mpropdef
, args
)
1128 var recv
= args
.first
1129 assert recv
isa MutableInstance
1130 var attr
= self.mpropdef
.mproperty
1131 if mpropdef
== mreadpropdef
then
1132 assert args
.length
== 1
1133 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1134 return evaluate_expr
(v
, recv
)
1135 else if mpropdef
== mwritepropdef
then
1136 assert args
.length
== 2
1137 v
.write_attribute
(attr
, recv
, args
[1])
1144 # Evaluate and set the default value of the attribute in `recv`
1145 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1147 if is_lazy
then return
1149 evaluate_expr
(v
, recv
)
1152 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1153 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1154 if mtype
isa MNullableType then
1155 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1159 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1161 assert recv
isa MutableInstance
1162 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1167 var nexpr
= self.n_expr
1168 var nblock
= self.n_block
1169 if nexpr
!= null then
1171 else if nblock
!= null then
1173 assert v
.returnmark
== f
1176 v
.escapevalue
= null
1183 assert not v
.is_escaping
1184 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1189 redef class AClassdef
1190 # Execute an implicit `mpropdef` associated with the current node.
1191 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1193 if mpropdef
.mproperty
.is_root_init
then
1194 assert args
.length
== 1
1195 if not mpropdef
.is_intro
then
1196 # standard call-next-method
1197 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1198 v
.call
(superpd
, args
)
1208 # Evaluate the node as a possible expression.
1209 # Return a possible value
1210 # NOTE: Do not call this method directly, but use `v.expr`
1211 # This method is here to be implemented by subclasses.
1212 private fun expr
(v
: NaiveInterpreter): nullable Instance
1214 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1218 # Evaluate the node as a statement.
1219 # NOTE: Do not call this method directly, but use `v.stmt`
1220 # This method is here to be implemented by subclasses (no need to return something).
1221 private fun stmt
(v
: NaiveInterpreter)
1228 redef class ABlockExpr
1231 var last
= self.n_expr
.last
1232 for e
in self.n_expr
do
1233 if e
== last
then break
1235 if v
.is_escaping
then return null
1242 for e
in self.n_expr
do
1244 if v
.is_escaping
then return
1249 redef class AVardeclExpr
1252 var ne
= self.n_expr
1255 if i
== null then return
1256 v
.write_variable
(self.variable
.as(not null), i
)
1261 redef class AVarExpr
1264 return v
.read_variable
(self.variable
.as(not null))
1268 redef class AVarAssignExpr
1271 var i
= v
.expr
(self.n_value
)
1272 if i
== null then return null
1273 v
.write_variable
(self.variable
.as(not null), i
)
1278 redef class AVarReassignExpr
1281 var variable
= self.variable
.as(not null)
1282 var vari
= v
.read_variable
(variable
)
1283 var value
= v
.expr
(self.n_value
)
1284 if value
== null then return
1285 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1287 v
.write_variable
(variable
, res
)
1291 redef class ASelfExpr
1294 return v
.frame
.arguments
.first
1298 redef class AEscapeExpr
1301 var ne
= self.n_expr
1304 if i
== null then return
1307 v
.escapemark
= self.escapemark
1311 redef class AReturnExpr
1314 var ne
= self.n_expr
1317 if i
== null then return
1320 v
.returnmark
= v
.frame
1324 redef class AAbortExpr
1335 var cond
= v
.expr
(self.n_expr
)
1336 if cond
== null then return null
1337 if cond
.is_true
then
1338 return v
.expr
(self.n_then
.as(not null))
1340 return v
.expr
(self.n_else
.as(not null))
1346 var cond
= v
.expr
(self.n_expr
)
1347 if cond
== null then return
1348 if cond
.is_true
then
1356 redef class AIfexprExpr
1359 var cond
= v
.expr
(self.n_expr
)
1360 if cond
== null then return null
1361 if cond
.is_true
then
1362 return v
.expr
(self.n_then
)
1364 return v
.expr
(self.n_else
)
1372 v
.stmt
(self.n_block
)
1373 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1377 redef class AWhileExpr
1381 var cond
= v
.expr
(self.n_expr
)
1382 if cond
== null then return
1383 if not cond
.is_true
then return
1384 v
.stmt
(self.n_block
)
1385 if v
.is_escape
(self.break_mark
) then return
1386 v
.is_escape
(self.continue_mark
) # Clear the break
1387 if v
.is_escaping
then return
1392 redef class ALoopExpr
1396 v
.stmt
(self.n_block
)
1397 if v
.is_escape
(self.break_mark
) then return
1398 v
.is_escape
(self.continue_mark
) # Clear the break
1399 if v
.is_escaping
then return
1404 redef class AForExpr
1407 var col
= v
.expr
(self.n_expr
)
1408 if col
== null then return
1409 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1411 #self.debug("col {col}")
1412 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1413 #self.debug("iter {iter}")
1415 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1416 if not isok
.is_true
then break
1417 if self.variables
.length
== 1 then
1418 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1419 #self.debug("item {item}")
1420 v
.write_variable
(self.variables
.first
, item
)
1421 else if self.variables
.length
== 2 then
1422 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1423 v
.write_variable
(self.variables
[0], key
)
1424 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1425 v
.write_variable
(self.variables
[1], item
)
1429 v
.stmt
(self.n_block
)
1430 if v
.is_escape
(self.break_mark
) then break
1431 v
.is_escape
(self.continue_mark
) # Clear the break
1432 if v
.is_escaping
then break
1433 v
.callsite
(method_next
, [iter
])
1435 var method_finish
= self.method_finish
1436 if method_finish
!= null then
1437 v
.callsite
(method_finish
, [iter
])
1442 redef class AAssertExpr
1445 var cond
= v
.expr
(self.n_expr
)
1446 if cond
== null then return
1447 if not cond
.is_true
then
1449 if v
.is_escaping
then return
1452 fatal
(v
, "Assert '{nid.text}' failed")
1454 fatal
(v
, "Assert failed")
1464 var cond
= v
.expr
(self.n_expr
)
1465 if cond
== null then return null
1466 if cond
.is_true
then return cond
1467 return v
.expr
(self.n_expr2
)
1471 redef class AImpliesExpr
1474 var cond
= v
.expr
(self.n_expr
)
1475 if cond
== null then return null
1476 if not cond
.is_true
then return v
.true_instance
1477 return v
.expr
(self.n_expr2
)
1481 redef class AAndExpr
1484 var cond
= v
.expr
(self.n_expr
)
1485 if cond
== null then return null
1486 if not cond
.is_true
then return cond
1487 return v
.expr
(self.n_expr2
)
1491 redef class ANotExpr
1494 var cond
= v
.expr
(self.n_expr
)
1495 if cond
== null then return null
1496 return v
.bool_instance
(not cond
.is_true
)
1500 redef class AOrElseExpr
1503 var i
= v
.expr
(self.n_expr
)
1504 if i
== null then return null
1505 if i
!= v
.null_instance
then return i
1506 return v
.expr
(self.n_expr2
)
1510 redef class AIntExpr
1513 return v
.int_instance
(self.value
.as(not null))
1517 redef class AFloatExpr
1520 return v
.float_instance
(self.value
.as(not null))
1524 redef class ACharExpr
1527 return v
.char_instance
(self.value
.as(not null))
1531 redef class AArrayExpr
1534 var val
= new Array[Instance]
1535 for nexpr
in self.n_exprs
.n_exprs
do
1536 var i
= v
.expr
(nexpr
)
1537 if i
== null then return null
1540 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1541 var elttype
= mtype
.arguments
.first
1542 return v
.array_instance
(val
, elttype
)
1546 redef class AStringFormExpr
1549 var txt
= self.value
.as(not null)
1550 return v
.string_instance
(txt
)
1554 redef class ASuperstringExpr
1557 var array
= new Array[Instance]
1558 for nexpr
in n_exprs
do
1559 var i
= v
.expr
(nexpr
)
1560 if i
== null then return null
1563 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1564 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1570 redef class ACrangeExpr
1573 var e1
= v
.expr
(self.n_expr
)
1574 if e1
== null then return null
1575 var e2
= v
.expr
(self.n_expr2
)
1576 if e2
== null then return null
1577 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1578 var res
= new MutableInstance(mtype
)
1579 v
.init_instance
(res
)
1580 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1585 redef class AOrangeExpr
1588 var e1
= v
.expr
(self.n_expr
)
1589 if e1
== null then return null
1590 var e2
= v
.expr
(self.n_expr2
)
1591 if e2
== null then return null
1592 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1593 var res
= new MutableInstance(mtype
)
1594 v
.init_instance
(res
)
1595 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1600 redef class ATrueExpr
1603 return v
.bool_instance
(true)
1607 redef class AFalseExpr
1610 return v
.bool_instance
(false)
1614 redef class ANullExpr
1617 return v
.null_instance
1621 redef class AIsaExpr
1624 var i
= v
.expr
(self.n_expr
)
1625 if i
== null then return null
1626 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1627 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1631 redef class AAsCastExpr
1634 var i
= v
.expr
(self.n_expr
)
1635 if i
== null then return null
1636 var mtype
= self.mtype
.as(not null)
1637 var amtype
= v
.unanchor_type
(mtype
)
1638 if not v
.is_subtype
(i
.mtype
, amtype
) then
1639 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1645 redef class AAsNotnullExpr
1648 var i
= v
.expr
(self.n_expr
)
1649 if i
== null then return null
1650 if i
.mtype
isa MNullType then
1651 fatal
(v
, "Cast failed")
1657 redef class AParExpr
1660 return v
.expr
(self.n_expr
)
1664 redef class AOnceExpr
1667 if v
.onces
.has_key
(self) then
1668 return v
.onces
[self]
1670 var res
= v
.expr
(self.n_expr
)
1671 if res
== null then return null
1678 redef class ASendExpr
1681 var recv
= v
.expr
(self.n_expr
)
1682 if recv
== null then return null
1683 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1684 if args
== null then return null
1686 var res
= v
.callsite
(callsite
, args
)
1691 redef class ASendReassignFormExpr
1694 var recv
= v
.expr
(self.n_expr
)
1695 if recv
== null then return
1696 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1697 if args
== null then return
1698 var value
= v
.expr
(self.n_value
)
1699 if value
== null then return
1701 var read
= v
.callsite
(callsite
, args
)
1704 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1705 assert write
!= null
1709 v
.callsite
(write_callsite
, args
)
1713 redef class ASuperExpr
1716 var recv
= v
.frame
.arguments
.first
1718 var callsite
= self.callsite
1719 if callsite
!= null then
1720 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1721 if args
== null then return null
1722 # Add additional arguments for the super init call
1723 if args
.length
== 1 then
1724 for i
in [0..callsite
.msignature
.arity
[ do
1725 args
.add
(v
.frame
.arguments
[i
+1])
1729 var res
= v
.callsite
(callsite
, args
)
1733 # standard call-next-method
1734 var mpropdef
= self.mpropdef
1735 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1737 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1738 if args
== null then return null
1740 if args
.length
== 1 then
1741 args
= v
.frame
.arguments
1743 var res
= v
.call
(mpropdef
, args
)
1748 redef class ANewExpr
1751 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1752 var recv
: Instance = new MutableInstance(mtype
)
1753 v
.init_instance
(recv
)
1754 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1755 if args
== null then return null
1756 var res2
= v
.callsite
(callsite
, args
)
1757 if res2
!= null then
1758 #self.debug("got {res2} from {mproperty}. drop {recv}")
1765 redef class AAttrExpr
1768 var recv
= v
.expr
(self.n_expr
)
1769 if recv
== null then return null
1770 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1771 var mproperty
= self.mproperty
.as(not null)
1772 return v
.read_attribute
(mproperty
, recv
)
1776 redef class AAttrAssignExpr
1779 var recv
= v
.expr
(self.n_expr
)
1780 if recv
== null then return
1781 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1782 var i
= v
.expr
(self.n_value
)
1783 if i
== null then return
1784 var mproperty
= self.mproperty
.as(not null)
1785 v
.write_attribute
(mproperty
, recv
, i
)
1789 redef class AAttrReassignExpr
1792 var recv
= v
.expr
(self.n_expr
)
1793 if recv
== null then return
1794 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1795 var value
= v
.expr
(self.n_value
)
1796 if value
== null then return
1797 var mproperty
= self.mproperty
.as(not null)
1798 var attr
= v
.read_attribute
(mproperty
, recv
)
1799 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1801 v
.write_attribute
(mproperty
, recv
, res
)
1805 redef class AIssetAttrExpr
1808 var recv
= v
.expr
(self.n_expr
)
1809 if recv
== null then return null
1810 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1811 var mproperty
= self.mproperty
.as(not null)
1812 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1816 redef class ADebugTypeExpr