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)
176 if n
== null then return
178 if n
.comprehension
!= null then
179 var comprehension
= frame
.comprehension
.as(not null)
181 if i
!= null then comprehension
.add
(i
)
185 var frame
= self.frame
186 var old
= frame
.current_node
187 frame
.current_node
= n
189 frame
.current_node
= old
192 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
193 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
195 # Return the boolean instance associated with `val`.
196 fun bool_instance
(val
: Bool): Instance
198 if val
then return self.true_instance
else return self.false_instance
201 # Return the integer instance associated with `val`.
202 fun int_instance
(val
: Int): Instance
204 var ic
= get_primitive_class
("Int")
205 var instance
= new PrimitiveInstance[Int](ic
.mclass_type
, val
)
206 init_instance_primitive
(instance
)
210 # Return the char instance associated with `val`.
211 fun char_instance
(val
: Char): Instance
213 var ic
= get_primitive_class
("Char")
214 var instance
= new PrimitiveInstance[Char](ic
.mclass_type
, val
)
215 init_instance_primitive
(instance
)
219 # Return the float instance associated with `val`.
220 fun float_instance
(val
: Float): Instance
222 var ic
= get_primitive_class
("Float")
223 var instance
= new PrimitiveInstance[Float](ic
.mclass_type
, val
)
224 init_instance_primitive
(instance
)
228 # The unique instance of the `true` value.
229 var true_instance
: Instance is noinit
231 # The unique instance of the `false` value.
232 var false_instance
: Instance is noinit
234 # The unique instance of the `null` value.
235 var null_instance
: Instance is noinit
237 # Return a new array made of `values`.
238 # The dynamic type of the result is Array[elttype].
239 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
241 assert not elttype
.need_anchor
242 var nat
= new PrimitiveInstance[Array[Instance]](get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
243 init_instance_primitive
(nat
)
244 var mtype
= get_primitive_class
("Array").get_mtype
([elttype
])
245 var res
= new MutableInstance(mtype
)
246 self.init_instance
(res
)
247 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
251 # Return a instance associated to a primitive class
252 # Current primitive classes are `Int`, `Bool`, and `String`
253 fun value_instance
(object
: Object): Instance
255 if object
isa Int then
256 return int_instance
(object
)
257 else if object
isa Bool then
258 return bool_instance
(object
)
259 else if object
isa String then
260 return string_instance
(object
)
266 # Return a new native string initialized with `txt`
267 fun native_string_instance
(txt
: String): Instance
269 var val
= new FlatBuffer.from
(txt
)
271 var ic
= get_primitive_class
("NativeString")
272 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
273 init_instance_primitive
(instance
)
277 # Return a new String instance for `txt`
278 fun string_instance
(txt
: String): Instance
280 var nat
= native_string_instance
(txt
)
281 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
286 # The current frame used to store local variables of the current method executed
287 fun frame
: Frame do return frames
.first
289 # The stack of all frames. The first one is the current one.
290 var frames
= new List[Frame]
292 # Return a stack trace. One line per function
293 fun stack_trace
: String
295 var b
= new FlatBuffer
296 b
.append
(",---- Stack trace -- - - -\n")
298 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
300 b
.append
("`------------------- - - -")
304 # The current node, used to print errors, debug and stack-traces
305 fun current_node
: nullable ANode
307 if frames
.is_empty
then return null
308 return frames
.first
.current_node
311 # The dynamic type of the current `self`
312 fun current_receiver_class
: MClassType
314 return frames
.first
.arguments
.first
.mtype
.as(MClassType)
317 # Exit the program with a message
318 fun fatal
(message
: String)
320 var node
= current_node
324 node
.fatal
(self, message
)
329 # Debug on the current node
330 fun debug
(message
: String)
332 var node
= current_node
340 # Retrieve the value of the variable in the current frame
341 fun read_variable
(v
: Variable): Instance
347 # Assign the value of the variable in the current frame
348 fun write_variable
(v
: Variable, value
: Instance)
354 # Store known methods, used to trace methods as they are reached
355 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
357 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
358 # This method is used to manage varargs in signatures and returns the real array
359 # of instances to use in the call.
360 # Return `null` if one of the evaluation of the arguments return null.
361 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
363 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
364 var res
= new Array[Instance]
367 if args
.is_empty
then return res
369 var vararg_rank
= msignature
.vararg_rank
370 var vararg_len
= args
.length
- msignature
.arity
371 if vararg_len
< 0 then vararg_len
= 0
373 for i
in [0..msignature
.arity
[ do
374 if i
== vararg_rank
then
376 if ne
isa AVarargExpr then
377 var e
= self.expr
(ne
.n_expr
)
378 if e
== null then return null
382 var vararg
= new Array[Instance]
383 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
384 var e
= self.expr
(args
[j
])
385 if e
== null then return null
388 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
389 res
.add
(self.array_instance
(vararg
, elttype
))
392 if i
> vararg_rank
then j
+= vararg_len
393 var e
= self.expr
(args
[j
])
394 if e
== null then return null
401 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
402 # Return a value if `mpropdef` is a function, or null if it is a procedure.
403 # The call is direct/static. There is no message-sending/late-binding.
404 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
406 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
407 self.discover_call_trace
.add mpropdef
408 self.debug
("Discovered {mpropdef}")
410 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
412 # Look for the AST node that implements the property
413 var val
= mpropdef
.constant_value
415 var node
= modelbuilder
.mpropdef2node
(mpropdef
)
416 if mpropdef
.is_abstract
then
418 self.frames
.unshift
new Frame(node
, mpropdef
, args
)
420 fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{args.first.mtype}`")
424 if node
isa APropdef then
425 self.parameter_check
(node
, mpropdef
, args
)
426 return node
.call
(self, mpropdef
, args
)
427 else if node
isa AClassdef then
428 self.parameter_check
(node
, mpropdef
, args
)
429 return node
.call
(self, mpropdef
, args
)
430 else if node
!= null then
431 fatal
("Fatal Error: method {mpropdef} associated to unexpected AST node {node.location}")
433 else if val
!= null then
434 return value_instance
(val
)
436 fatal
("Fatal Error: method {mpropdef} not found in the AST")
441 # Execute type checks of covariant parameters
442 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
444 var msignature
= mpropdef
.msignature
445 for i
in [0..msignature
.arity
[ do
446 # skip test for vararg since the array is instantiated with the correct polymorphic type
447 if msignature
.vararg_rank
== i
then continue
449 # skip if the cast is not required
450 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
451 if not origmtype
.need_anchor
then continue
453 #print "{mpropdef}: {mpropdef.mproperty.intro.msignature.mparameters[i]}"
455 # get the parameter type
456 var mtype
= msignature
.mparameters
[i
].mtype
457 var anchor
= args
.first
.mtype
.as(MClassType)
458 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
459 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
460 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
465 # Common code for runtime injected calls and normal calls
466 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
468 if mtype
isa MNullType then
469 if mproperty
.name
== "==" or mproperty
.name
== "is_same_instance" then
470 return self.bool_instance
(args
[0] == args
[1])
471 else if mproperty
.name
== "!=" then
472 return self.bool_instance
(args
[0] != args
[1])
474 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
475 fatal
("Receiver is null")
480 # Execute a full `callsite` for given `args`
481 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
482 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
484 var initializers
= callsite
.mpropdef
.initializers
485 if not initializers
.is_empty
then
486 var recv
= arguments
.first
488 for p
in initializers
do
489 if p
isa MMethod then
491 for x
in p
.intro
.msignature
.mparameters
do
492 args
.add arguments
[i
]
496 else if p
isa MAttribute then
497 assert recv
isa MutableInstance
498 write_attribute
(p
, recv
, arguments
[i
])
502 assert i
== arguments
.length
504 return send
(callsite
.mproperty
, [recv
])
506 return send
(callsite
.mproperty
, arguments
)
509 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
510 # Return a value if `mproperty` is a function, or null if it is a procedure.
511 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
512 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
514 var recv
= args
.first
515 var mtype
= recv
.mtype
516 var ret
= send_commons
(mproperty
, args
, mtype
)
517 if ret
!= null then return ret
518 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
519 return self.call
(propdef
, args
)
522 # Read the attribute `mproperty` of an instance `recv` and return its value.
523 # If the attribute in not yet initialized, then aborts with an error message.
524 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
526 assert recv
isa MutableInstance
527 if not recv
.attributes
.has_key
(mproperty
) then
528 fatal
("Uninitialized attribute {mproperty.name}")
531 return recv
.attributes
[mproperty
]
534 # Replace in `recv` the value of the attribute `mproperty` by `value`
535 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
537 assert recv
isa MutableInstance
538 recv
.attributes
[mproperty
] = value
541 # Is the attribute `mproperty` initialized the instance `recv`?
542 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
544 assert recv
isa MutableInstance
545 return recv
.attributes
.has_key
(mproperty
)
548 # Collect attributes of a type in the order of their init
549 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
551 var cache
= self.collect_attr_propdef_cache
552 if cache
.has_key
(mtype
) then return cache
[mtype
]
554 var res
= new Array[AAttrPropdef]
555 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
556 self.mainmodule
.linearize_mclassdefs
(cds
)
558 res
.add_all
(modelbuilder
.collect_attr_propdef
(cd
))
565 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
567 # Fill the initial values of the newly created instance `recv`.
568 # `recv.mtype` is used to know what must be filled.
569 fun init_instance
(recv
: Instance)
571 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
572 npropdef
.init_expr
(self, recv
)
576 # A hook to initialize a `PrimitiveInstance`
577 fun init_instance_primitive
(recv
: Instance) do end
579 # Return the primitive `MClass` corresponding to the `name` given in parameter
580 # `name` : name of the primitive class
581 fun get_primitive_class
(name
: String): MClass
583 return mainmodule
.get_primitive_class
(name
)
586 # This function determines the correct type according to the receiver of the current propdef (self).
587 fun unanchor_type
(mtype
: MType): MType
589 return mtype
.anchor_to
(self.mainmodule
, current_receiver_class
)
592 # Placebo instance used to mark internal error result when `null` already have a meaning.
593 # TODO: replace with multiple return or something better
594 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
597 # An instance represents a value of the executed program.
598 abstract class Instance
599 # The dynamic type of the instance
600 # ASSERT: not self.mtype.is_anchored
603 # return true if the instance is the true value.
604 # return false if the instance is the true value.
606 fun is_true
: Bool do abort
608 # Return true if `self` IS `o` (using the Nit semantic of is)
609 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
611 # Human readable object identity "Type#number"
612 redef fun to_s
do return "{mtype}"
614 # Return the integer value if the instance is an integer.
616 fun to_i
: Int do abort
618 # Return the integer value if the instance is a float.
620 fun to_f
: Float do abort
622 # The real value encapsulated if the instance is primitive.
624 fun val
: nullable Object do abort
627 # A instance with attribute (standards objects)
628 class MutableInstance
631 # The values of the attributes
632 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
635 # Special instance to handle primitives values (int, bool, etc.)
636 # The trick it just to encapsulate the <<real>> value
637 class PrimitiveInstance[E
]
640 # The real value encapsulated
645 if val
== true then return true
646 if val
== false then return false
652 if not o
isa PrimitiveInstance[nullable Object] then return false
653 return self.val
== o
.val
658 if not o
isa PrimitiveInstance[nullable Object] then return false
659 return self.val
.is_same_instance
(o
.val
)
662 redef fun to_s
do return "{mtype}#{val.object_id}({val or else "null"})"
664 redef fun to_i
do return val
.as(Int)
666 redef fun to_f
do return val
.as(Float)
669 # Information about local variables in a running method
671 # The current visited node
672 # The node is stored by frame to keep a stack trace
673 var current_node
: ANode
674 # The executed property.
675 # A Method in case of a call, an attribute in case of a default initialization.
676 var mpropdef
: MPropDef
677 # Arguments of the method (the first is the receiver)
678 var arguments
: Array[Instance]
679 # Mapping between a variable and the current value
680 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
681 var comprehension
: nullable Array[Instance] = null
685 # Aborts the program with a message
686 # `v` is used to know if a colored message is displayed or not
687 fun fatal
(v
: NaiveInterpreter, message
: String)
689 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
690 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
692 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
693 sys
.stderr
.write
(v
.stack_trace
)
694 sys
.stderr
.write
("\n")
701 # Execute a `mpropdef` associated with the current node.
702 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
704 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
709 redef class AMethPropdef
712 redef fun call
(v
, mpropdef
, args
)
714 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
715 var res
= call_commons
(v
, mpropdef
, args
, f
)
717 if v
.returnmark
== f
then
726 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
730 for i
in [0..mpropdef
.msignature
.arity
[ do
731 var variable
= self.n_signature
.n_params
[i
].variable
732 assert variable
!= null
733 v
.write_variable
(variable
, arguments
[i
+1])
736 # Call the implicit super-init
737 var auto_super_inits
= self.auto_super_inits
738 if auto_super_inits
!= null then
739 var args
= [arguments
.first
]
740 for auto_super_init
in auto_super_inits
do
742 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
743 args
.add
(arguments
[i
])
745 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
746 v
.callsite
(auto_super_init
, args
)
749 if auto_super_call
then
750 # standard call-next-method
751 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
752 v
.call
(superpd
, arguments
)
755 if mpropdef
.is_intern
or mpropdef
.is_extern
then
756 var res
= intern_call
(v
, mpropdef
, arguments
)
757 if res
!= v
.error_instance
then return res
760 if n_block
!= null then
765 if mpropdef
.is_intern
then
766 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
767 else if mpropdef
.is_extern
then
768 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
770 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
775 # Interprets a intern or a shortcut extern method.
776 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
777 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
779 var pname
= mpropdef
.mproperty
.name
780 var cname
= mpropdef
.mclassdef
.mclass
.name
781 if pname
== "output" then
782 var recv
= args
.first
785 else if pname
== "object_id" then
786 var recv
= args
.first
787 if recv
isa PrimitiveInstance[Object] then
788 return v
.int_instance
(recv
.val
.object_id
)
790 return v
.int_instance
(recv
.object_id
)
792 else if pname
== "output_class_name" then
793 var recv
= args
.first
796 else if pname
== "native_class_name" then
797 var recv
= args
.first
798 var txt
= recv
.mtype
.to_s
799 return v
.native_string_instance
(txt
)
800 else if pname
== "==" then
801 # == is correctly redefined for instances
802 return v
.bool_instance
(args
[0] == args
[1])
803 else if pname
== "!=" then
804 return v
.bool_instance
(args
[0] != args
[1])
805 else if pname
== "is_same_type" then
806 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
807 else if pname
== "is_same_instance" then
808 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
809 else if pname
== "exit" then
812 else if pname
== "buffer_mode_full" then
813 return v
.int_instance
(sys
.buffer_mode_full
)
814 else if pname
== "buffer_mode_line" then
815 return v
.int_instance
(sys
.buffer_mode_line
)
816 else if pname
== "buffer_mode_none" then
817 return v
.int_instance
(sys
.buffer_mode_none
)
818 else if pname
== "sys" then
820 else if cname
== "Int" then
821 var recvval
= args
[0].to_i
822 if pname
== "unary -" then
823 return v
.int_instance
(-args
[0].to_i
)
824 else if pname
== "+" then
825 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
826 else if pname
== "-" then
827 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
828 else if pname
== "*" then
829 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
830 else if pname
== "%" then
831 return v
.int_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
== "<" then
835 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
836 else if pname
== ">" then
837 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
838 else if pname
== "<=" then
839 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
840 else if pname
== ">=" then
841 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
842 else if pname
== "<=>" then
843 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
844 else if pname
== "ascii" then
845 return v
.char_instance
(args
[0].to_i
.ascii
)
846 else if pname
== "to_f" then
847 return v
.float_instance
(args
[0].to_i
.to_f
)
848 else if pname
== "lshift" then
849 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
850 else if pname
== "rshift" then
851 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
852 else if pname
== "rand" then
853 var res
= recvval
.rand
854 return v
.int_instance
(res
)
855 else if pname
== "bin_and" then
856 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
857 else if pname
== "bin_or" then
858 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
859 else if pname
== "bin_xor" then
860 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
861 else if pname
== "bin_not" then
862 return v
.int_instance
(args
[0].to_i
.bin_not
)
863 else if pname
== "int_to_s_len" then
864 return v
.int_instance
(recvval
.to_s
.length
)
865 else if pname
== "native_int_to_s" then
867 var srecv
= args
[1].val
.as(Buffer)
872 else if pname
== "strerror_ext" then
873 return v
.native_string_instance
(recvval
.strerror
)
875 else if cname
== "Char" then
876 var recv
= args
[0].val
.as(Char)
877 if pname
== "ascii" then
878 return v
.int_instance
(recv
.ascii
)
879 else if pname
== "successor" then
880 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
881 else if pname
== "predecessor" then
882 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
883 else if pname
== "<" then
884 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
885 else if pname
== ">" then
886 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
887 else if pname
== "<=" then
888 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
889 else if pname
== ">=" then
890 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
891 else if pname
== "<=>" then
892 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
894 else if cname
== "Float" then
895 var recv
= args
[0].to_f
896 if pname
== "unary -" then
897 return v
.float_instance
(-recv
)
898 else if pname
== "+" then
899 return v
.float_instance
(recv
+ args
[1].to_f
)
900 else if pname
== "-" then
901 return v
.float_instance
(recv
- args
[1].to_f
)
902 else if pname
== "*" then
903 return v
.float_instance
(recv
* args
[1].to_f
)
904 else if pname
== "/" then
905 return v
.float_instance
(recv
/ args
[1].to_f
)
906 else if pname
== "<" then
907 return v
.bool_instance
(recv
< args
[1].to_f
)
908 else if pname
== ">" then
909 return v
.bool_instance
(recv
> args
[1].to_f
)
910 else if pname
== "<=" then
911 return v
.bool_instance
(recv
<= args
[1].to_f
)
912 else if pname
== ">=" then
913 return v
.bool_instance
(recv
>= args
[1].to_f
)
914 else if pname
== "to_i" then
915 return v
.int_instance
(recv
.to_i
)
916 else if pname
== "cos" then
917 return v
.float_instance
(args
[0].to_f
.cos
)
918 else if pname
== "sin" then
919 return v
.float_instance
(args
[0].to_f
.sin
)
920 else if pname
== "tan" then
921 return v
.float_instance
(args
[0].to_f
.tan
)
922 else if pname
== "acos" then
923 return v
.float_instance
(args
[0].to_f
.acos
)
924 else if pname
== "asin" then
925 return v
.float_instance
(args
[0].to_f
.asin
)
926 else if pname
== "atan" then
927 return v
.float_instance
(args
[0].to_f
.atan
)
928 else if pname
== "sqrt" then
929 return v
.float_instance
(args
[0].to_f
.sqrt
)
930 else if pname
== "exp" then
931 return v
.float_instance
(args
[0].to_f
.exp
)
932 else if pname
== "log" then
933 return v
.float_instance
(args
[0].to_f
.log
)
934 else if pname
== "pow" then
935 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
936 else if pname
== "rand" then
937 return v
.float_instance
(args
[0].to_f
.rand
)
938 else if pname
== "abs" then
939 return v
.float_instance
(args
[0].to_f
.abs
)
940 else if pname
== "hypot_with" then
941 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
942 else if pname
== "is_nan" then
943 return v
.bool_instance
(args
[0].to_f
.is_nan
)
944 else if pname
== "is_inf_extern" then
945 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
946 else if pname
== "round" then
947 return v
.float_instance
(args
[0].to_f
.round
)
949 else if cname
== "NativeString" then
950 if pname
== "new" then
951 return v
.native_string_instance
("!" * args
[1].to_i
)
953 var recvval
= args
.first
.val
.as(Buffer)
954 if pname
== "[]" then
955 var arg1
= args
[1].to_i
956 if arg1
>= recvval
.length
or arg1
< 0 then
957 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
959 return v
.char_instance
(recvval
.chars
[arg1
])
960 else if pname
== "[]=" then
961 var arg1
= args
[1].to_i
962 if arg1
>= recvval
.length
or arg1
< 0 then
963 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
965 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
967 else if pname
== "copy_to" then
968 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
969 var destval
= args
[1].val
.as(FlatBuffer)
970 var lenval
= args
[2].to_i
971 var fromval
= args
[3].to_i
972 var toval
= args
[4].to_i
974 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
976 if fromval
+ lenval
> recvval
.length
then
977 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
980 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
982 if toval
+ lenval
> destval
.length
then
983 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
985 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
987 else if pname
== "atoi" then
988 return v
.int_instance
(recvval
.to_i
)
989 else if pname
== "file_exists" then
990 return v
.bool_instance
(recvval
.to_s
.file_exists
)
991 else if pname
== "file_mkdir" then
994 else if pname
== "file_chdir" then
997 else if pname
== "file_realpath" then
998 return v
.native_string_instance
(recvval
.to_s
.realpath
)
999 else if pname
== "get_environ" then
1000 var txt
= recvval
.to_s
.environ
1001 return v
.native_string_instance
(txt
)
1002 else if pname
== "system" then
1003 var res
= sys
.system
(recvval
.to_s
)
1004 return v
.int_instance
(res
)
1005 else if pname
== "atof" then
1006 return v
.float_instance
(recvval
.to_f
)
1008 else if cname
== "String" then
1009 var cs
= v
.send
(v
.force_get_primitive_method
("to_cstring", args
.first
.mtype
), [args
.first
])
1010 var str
= cs
.val
.to_s
1011 if pname
== "files" then
1012 var res
= new Array[Instance]
1013 for f
in str
.files
do res
.add v
.string_instance
(f
)
1014 return v
.array_instance
(res
, v
.get_primitive_class
("String").mclass_type
)
1016 else if pname
== "calloc_string" then
1017 return v
.native_string_instance
("!" * args
[1].to_i
)
1018 else if cname
== "NativeArray" then
1019 if pname
== "new" then
1020 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1021 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
1022 v
.init_instance_primitive
(instance
)
1025 var recvval
= args
.first
.val
.as(Array[Instance])
1026 if pname
== "[]" then
1027 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
1028 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
1030 return recvval
[args
[1].to_i
]
1031 else if pname
== "[]=" then
1032 recvval
[args
[1].to_i
] = args
[2]
1034 else if pname
== "length" then
1035 return v
.int_instance
(recvval
.length
)
1036 else if pname
== "copy_to" then
1037 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1040 else if cname
== "NativeFile" then
1041 if pname
== "native_stdout" then
1042 var inst
= new PrimitiveNativeFile.native_stdout
1043 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1044 v
.init_instance_primitive
(instance
)
1046 else if pname
== "native_stdin" then
1047 var inst
= new PrimitiveNativeFile.native_stdin
1048 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1049 v
.init_instance_primitive
(instance
)
1051 else if pname
== "native_stderr" then
1052 var inst
= new PrimitiveNativeFile.native_stderr
1053 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1054 v
.init_instance_primitive
(instance
)
1056 else if pname
== "io_open_read" then
1057 var a1
= args
[1].val
.as(Buffer)
1058 var inst
= new PrimitiveNativeFile.io_open_read
(a1
.to_s
)
1059 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1060 v
.init_instance_primitive
(instance
)
1062 else if pname
== "io_open_write" then
1063 var a1
= args
[1].val
.as(Buffer)
1064 var inst
= new PrimitiveNativeFile.io_open_write
(a1
.to_s
)
1065 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1066 v
.init_instance_primitive
(instance
)
1069 var recvval
= args
.first
.val
1070 if pname
== "io_write" then
1071 var a1
= args
[1].val
.as(Buffer)
1072 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_write
(a1
.to_cstring
, args
[2].to_i
))
1073 else if pname
== "io_read" then
1074 var a1
= args
[1].val
.as(Buffer)
1075 var ns
= new NativeString(a1
.length
)
1076 var len
= recvval
.as(PrimitiveNativeFile).io_read
(ns
, args
[2].to_i
)
1078 a1
.append
(ns
.to_s_with_length
(len
))
1079 return v
.int_instance
(len
)
1080 else if pname
== "flush" then
1081 recvval
.as(PrimitiveNativeFile).flush
1083 else if pname
== "io_close" then
1084 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_close
)
1085 else if pname
== "set_buffering_type" then
1086 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).set_buffering_type
(args
[1].to_i
, args
[2].to_i
))
1088 else if pname
== "calloc_array" then
1089 var recvtype
= args
.first
.mtype
.as(MClassType)
1091 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1092 mtype
= mtype
.arguments
.first
1093 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1094 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1095 v
.init_instance_primitive
(instance
)
1097 else if pname
== "native_argc" then
1098 return v
.int_instance
(v
.arguments
.length
)
1099 else if pname
== "native_argv" then
1100 var txt
= v
.arguments
[args
[1].to_i
]
1101 return v
.native_string_instance
(txt
)
1102 else if pname
== "native_argc" then
1103 return v
.int_instance
(v
.arguments
.length
)
1104 else if pname
== "native_argv" then
1105 var txt
= v
.arguments
[args
[1].to_i
]
1106 return v
.native_string_instance
(txt
)
1107 else if pname
== "get_time" then
1108 return v
.int_instance
(get_time
)
1109 else if pname
== "srand" then
1112 else if pname
== "srand_from" then
1113 srand_from
(args
[1].to_i
)
1115 else if pname
== "atan2" then
1116 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1117 else if pname
== "pi" then
1118 return v
.float_instance
(pi
)
1119 else if pname
== "lexer_goto" then
1120 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1121 else if pname
== "lexer_accept" then
1122 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1123 else if pname
== "parser_goto" then
1124 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1125 else if pname
== "parser_action" then
1126 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1127 else if pname
== "file_getcwd" then
1128 return v
.native_string_instance
(getcwd
)
1129 else if pname
== "errno" then
1130 return v
.int_instance
(sys
.errno
)
1131 else if pname
== "address_is_null" then
1133 if recv
isa PrimitiveInstance[PrimitiveNativeFile] then
1134 return v
.bool_instance
(recv
.val
.address_is_null
)
1136 return v
.false_instance
1138 return v
.error_instance
1142 redef class AAttrPropdef
1143 redef fun call
(v
, mpropdef
, args
)
1145 var recv
= args
.first
1146 assert recv
isa MutableInstance
1147 var attr
= self.mpropdef
.mproperty
1148 if mpropdef
== mreadpropdef
then
1149 assert args
.length
== 1
1150 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1151 return evaluate_expr
(v
, recv
)
1152 else if mpropdef
== mwritepropdef
then
1153 assert args
.length
== 2
1154 v
.write_attribute
(attr
, recv
, args
[1])
1161 # Evaluate and set the default value of the attribute in `recv`
1162 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1164 if is_lazy
then return
1166 evaluate_expr
(v
, recv
)
1169 var mpropdef
= self.mpropdef
1170 if mpropdef
== null then return
1171 var mtype
= mpropdef
.static_mtype
.as(not null)
1172 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1173 if mtype
isa MNullableType then
1174 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1178 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1180 assert recv
isa MutableInstance
1181 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1186 var nexpr
= self.n_expr
1187 var nblock
= self.n_block
1188 if nexpr
!= null then
1190 else if nblock
!= null then
1192 assert v
.returnmark
== f
1195 v
.escapevalue
= null
1202 assert not v
.is_escaping
1203 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1208 redef class AClassdef
1209 # Execute an implicit `mpropdef` associated with the current node.
1210 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1212 if mpropdef
.mproperty
.is_root_init
then
1213 assert args
.length
== 1
1214 if not mpropdef
.is_intro
then
1215 # standard call-next-method
1216 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1217 v
.call
(superpd
, args
)
1227 # Evaluate the node as a possible expression.
1228 # Return a possible value
1229 # NOTE: Do not call this method directly, but use `v.expr`
1230 # This method is here to be implemented by subclasses.
1231 protected fun expr
(v
: NaiveInterpreter): nullable Instance
1233 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1237 # Evaluate the node as a statement.
1238 # NOTE: Do not call this method directly, but use `v.stmt`
1239 # This method is here to be implemented by subclasses (no need to return something).
1240 protected fun stmt
(v
: NaiveInterpreter)
1247 redef class ABlockExpr
1250 var last
= self.n_expr
.last
1251 for e
in self.n_expr
do
1252 if e
== last
then break
1254 if v
.is_escaping
then return null
1261 for e
in self.n_expr
do
1263 if v
.is_escaping
then return
1268 redef class AVardeclExpr
1271 var ne
= self.n_expr
1274 if i
== null then return
1275 v
.write_variable
(self.variable
.as(not null), i
)
1280 redef class AVarExpr
1283 return v
.read_variable
(self.variable
.as(not null))
1287 redef class AVarAssignExpr
1290 var i
= v
.expr
(self.n_value
)
1291 if i
== null then return null
1292 v
.write_variable
(self.variable
.as(not null), i
)
1297 redef class AVarReassignExpr
1300 var variable
= self.variable
.as(not null)
1301 var vari
= v
.read_variable
(variable
)
1302 var value
= v
.expr
(self.n_value
)
1303 if value
== null then return
1304 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1306 v
.write_variable
(variable
, res
)
1310 redef class ASelfExpr
1313 return v
.frame
.arguments
.first
1317 redef class AEscapeExpr
1320 var ne
= self.n_expr
1323 if i
== null then return
1326 v
.escapemark
= self.escapemark
1330 redef class AReturnExpr
1333 var ne
= self.n_expr
1336 if i
== null then return
1339 v
.returnmark
= v
.frame
1343 redef class AAbortExpr
1354 var cond
= v
.expr
(self.n_expr
)
1355 if cond
== null then return null
1356 if cond
.is_true
then
1357 return v
.expr
(self.n_then
.as(not null))
1359 return v
.expr
(self.n_else
.as(not null))
1365 var cond
= v
.expr
(self.n_expr
)
1366 if cond
== null then return
1367 if cond
.is_true
then
1375 redef class AIfexprExpr
1378 var cond
= v
.expr
(self.n_expr
)
1379 if cond
== null then return null
1380 if cond
.is_true
then
1381 return v
.expr
(self.n_then
)
1383 return v
.expr
(self.n_else
)
1391 v
.stmt
(self.n_block
)
1392 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1396 redef class AWhileExpr
1400 var cond
= v
.expr
(self.n_expr
)
1401 if cond
== null then return
1402 if not cond
.is_true
then return
1403 v
.stmt
(self.n_block
)
1404 if v
.is_escape
(self.break_mark
) then return
1405 v
.is_escape
(self.continue_mark
) # Clear the break
1406 if v
.is_escaping
then return
1411 redef class ALoopExpr
1415 v
.stmt
(self.n_block
)
1416 if v
.is_escape
(self.break_mark
) then return
1417 v
.is_escape
(self.continue_mark
) # Clear the break
1418 if v
.is_escaping
then return
1423 redef class AForExpr
1426 var col
= v
.expr
(self.n_expr
)
1427 if col
== null then return
1428 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1430 #self.debug("col {col}")
1431 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1432 #self.debug("iter {iter}")
1434 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1435 if not isok
.is_true
then break
1436 if self.variables
.length
== 1 then
1437 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1438 #self.debug("item {item}")
1439 v
.write_variable
(self.variables
.first
, item
)
1440 else if self.variables
.length
== 2 then
1441 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1442 v
.write_variable
(self.variables
[0], key
)
1443 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1444 v
.write_variable
(self.variables
[1], item
)
1448 v
.stmt
(self.n_block
)
1449 if v
.is_escape
(self.break_mark
) then break
1450 v
.is_escape
(self.continue_mark
) # Clear the break
1451 if v
.is_escaping
then break
1452 v
.callsite
(method_next
, [iter
])
1454 var method_finish
= self.method_finish
1455 if method_finish
!= null then
1456 v
.callsite
(method_finish
, [iter
])
1461 redef class AAssertExpr
1464 var cond
= v
.expr
(self.n_expr
)
1465 if cond
== null then return
1466 if not cond
.is_true
then
1468 if v
.is_escaping
then return
1471 fatal
(v
, "Assert '{nid.text}' failed")
1473 fatal
(v
, "Assert failed")
1483 var cond
= v
.expr
(self.n_expr
)
1484 if cond
== null then return null
1485 if cond
.is_true
then return cond
1486 return v
.expr
(self.n_expr2
)
1490 redef class AImpliesExpr
1493 var cond
= v
.expr
(self.n_expr
)
1494 if cond
== null then return null
1495 if not cond
.is_true
then return v
.true_instance
1496 return v
.expr
(self.n_expr2
)
1500 redef class AAndExpr
1503 var cond
= v
.expr
(self.n_expr
)
1504 if cond
== null then return null
1505 if not cond
.is_true
then return cond
1506 return v
.expr
(self.n_expr2
)
1510 redef class ANotExpr
1513 var cond
= v
.expr
(self.n_expr
)
1514 if cond
== null then return null
1515 return v
.bool_instance
(not cond
.is_true
)
1519 redef class AOrElseExpr
1522 var i
= v
.expr
(self.n_expr
)
1523 if i
== null then return null
1524 if i
!= v
.null_instance
then return i
1525 return v
.expr
(self.n_expr2
)
1529 redef class AIntExpr
1532 return v
.int_instance
(self.value
.as(not null))
1536 redef class AFloatExpr
1539 return v
.float_instance
(self.value
.as(not null))
1543 redef class ACharExpr
1546 return v
.char_instance
(self.value
.as(not null))
1550 redef class AArrayExpr
1553 var val
= new Array[Instance]
1554 var old_comprehension
= v
.frame
.comprehension
1555 v
.frame
.comprehension
= val
1556 for nexpr
in self.n_exprs
do
1557 if nexpr
isa AForExpr then
1560 var i
= v
.expr
(nexpr
)
1561 if i
== null then return null
1565 v
.frame
.comprehension
= old_comprehension
1566 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1567 var elttype
= mtype
.arguments
.first
1568 return v
.array_instance
(val
, elttype
)
1572 redef class AStringFormExpr
1575 var txt
= self.value
.as(not null)
1576 return v
.string_instance
(txt
)
1580 redef class ASuperstringExpr
1583 var array
= new Array[Instance]
1584 for nexpr
in n_exprs
do
1585 var i
= v
.expr
(nexpr
)
1586 if i
== null then return null
1589 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1590 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1596 redef class ACrangeExpr
1599 var e1
= v
.expr
(self.n_expr
)
1600 if e1
== null then return null
1601 var e2
= v
.expr
(self.n_expr2
)
1602 if e2
== null then return null
1603 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1604 var res
= new MutableInstance(mtype
)
1605 v
.init_instance
(res
)
1606 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1611 redef class AOrangeExpr
1614 var e1
= v
.expr
(self.n_expr
)
1615 if e1
== null then return null
1616 var e2
= v
.expr
(self.n_expr2
)
1617 if e2
== null then return null
1618 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1619 var res
= new MutableInstance(mtype
)
1620 v
.init_instance
(res
)
1621 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1626 redef class ATrueExpr
1629 return v
.bool_instance
(true)
1633 redef class AFalseExpr
1636 return v
.bool_instance
(false)
1640 redef class ANullExpr
1643 return v
.null_instance
1647 redef class AIsaExpr
1650 var i
= v
.expr
(self.n_expr
)
1651 if i
== null then return null
1652 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1653 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1657 redef class AAsCastExpr
1660 var i
= v
.expr
(self.n_expr
)
1661 if i
== null then return null
1662 var mtype
= self.mtype
.as(not null)
1663 var amtype
= v
.unanchor_type
(mtype
)
1664 if not v
.is_subtype
(i
.mtype
, amtype
) then
1665 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1671 redef class AAsNotnullExpr
1674 var i
= v
.expr
(self.n_expr
)
1675 if i
== null then return null
1676 if i
.mtype
isa MNullType then
1677 fatal
(v
, "Cast failed")
1683 redef class AParExpr
1686 return v
.expr
(self.n_expr
)
1690 redef class AOnceExpr
1693 if v
.onces
.has_key
(self) then
1694 return v
.onces
[self]
1696 var res
= v
.expr
(self.n_expr
)
1697 if res
== null then return null
1704 redef class ASendExpr
1707 var recv
= v
.expr
(self.n_expr
)
1708 if recv
== null then return null
1709 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1710 if args
== null then return null
1712 var res
= v
.callsite
(callsite
, args
)
1717 redef class ASendReassignFormExpr
1720 var recv
= v
.expr
(self.n_expr
)
1721 if recv
== null then return
1722 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1723 if args
== null then return
1724 var value
= v
.expr
(self.n_value
)
1725 if value
== null then return
1727 var read
= v
.callsite
(callsite
, args
)
1730 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1731 assert write
!= null
1735 v
.callsite
(write_callsite
, args
)
1739 redef class ASuperExpr
1742 var recv
= v
.frame
.arguments
.first
1744 var callsite
= self.callsite
1745 if callsite
!= null then
1746 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1747 if args
== null then return null
1748 # Add additional arguments for the super init call
1749 if args
.length
== 1 then
1750 for i
in [0..callsite
.msignature
.arity
[ do
1751 args
.add
(v
.frame
.arguments
[i
+1])
1755 var res
= v
.callsite
(callsite
, args
)
1759 # standard call-next-method
1760 var mpropdef
= self.mpropdef
1761 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1763 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1764 if args
== null then return null
1766 if args
.length
== 1 then
1767 args
= v
.frame
.arguments
1769 var res
= v
.call
(mpropdef
, args
)
1774 redef class ANewExpr
1777 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1778 var recv
: Instance = new MutableInstance(mtype
)
1779 v
.init_instance
(recv
)
1780 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1781 if args
== null then return null
1782 var res2
= v
.callsite
(callsite
, args
)
1783 if res2
!= null then
1784 #self.debug("got {res2} from {mproperty}. drop {recv}")
1791 redef class AAttrExpr
1794 var recv
= v
.expr
(self.n_expr
)
1795 if recv
== null then return null
1796 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1797 var mproperty
= self.mproperty
.as(not null)
1798 return v
.read_attribute
(mproperty
, recv
)
1802 redef class AAttrAssignExpr
1805 var recv
= v
.expr
(self.n_expr
)
1806 if recv
== null then return
1807 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1808 var i
= v
.expr
(self.n_value
)
1809 if i
== null then return
1810 var mproperty
= self.mproperty
.as(not null)
1811 v
.write_attribute
(mproperty
, recv
, i
)
1815 redef class AAttrReassignExpr
1818 var recv
= v
.expr
(self.n_expr
)
1819 if recv
== null then return
1820 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1821 var value
= v
.expr
(self.n_value
)
1822 if value
== null then return
1823 var mproperty
= self.mproperty
.as(not null)
1824 var attr
= v
.read_attribute
(mproperty
, recv
)
1825 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1827 v
.write_attribute
(mproperty
, recv
, res
)
1831 redef class AIssetAttrExpr
1834 var recv
= v
.expr
(self.n_expr
)
1835 if recv
== null then return null
1836 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1837 var mproperty
= self.mproperty
.as(not null)
1838 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1842 redef class ADebugTypeExpr