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
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 interpreter
.start
(mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 # The visitor that interprets the Nit Program by walking on the AST
57 class NaiveInterpreter
58 # The modelbuilder that know the AST and its associations with the model
59 var modelbuilder
: ModelBuilder
61 # The main module of the program (used to lookup method)
62 var mainmodule
: MModule
64 # The command line arguments of the interpreted program
65 # arguments.first is the program name
66 # arguments[1] is the first argument
67 var arguments
: Array[String]
69 # The main Sys instance
70 var mainobj
: nullable Instance is noinit
74 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
75 init_instance_primitive
(self.true_instance
)
76 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
77 init_instance_primitive
(self.false_instance
)
78 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
81 # Starts the interpreter on the main module of a program
82 fun start
(mainmodule
: MModule) do
83 var interpreter
= self
84 var sys_type
= mainmodule
.sys_type
85 if sys_type
== null then return # no class Sys
86 var mainobj
= new MutableInstance(sys_type
)
87 interpreter
.mainobj
= mainobj
88 interpreter
.init_instance
(mainobj
)
89 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
90 if initprop
!= null then
91 interpreter
.send
(initprop
, [mainobj
])
93 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
94 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
95 if mainprop
!= null then
96 interpreter
.send
(mainprop
, [mainobj
])
100 # Subtype test in the context of the mainmodule
101 fun is_subtype
(sub
, sup
: MType): Bool
103 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
106 # Get a primitive method in the context of the main module
107 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
109 assert recv
isa MClassType
110 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
113 # Is a return executed?
114 # Set this mark to skip the evaluation until the end of the specified method frame
115 var returnmark
: nullable Frame = null
117 # Is a break or a continue executed?
118 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
119 var escapemark
: nullable EscapeMark = null
121 # Is a return or a break or a continue executed?
122 # Use this function to know if you must skip the evaluation of statements
123 fun is_escaping
: Bool do return returnmark
!= null or escapemark
!= null
125 # The value associated with the current return/break/continue, if any.
126 # Set the value when you set a escapemark.
127 # Read the value when you catch a mark or reach the end of a method
128 var escapevalue
: nullable Instance = null
130 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
131 # If there is no break/continue or if `escapemark` is null then return false.
132 # Use this function to catch a potential break/continue.
133 fun is_escape
(escapemark
: nullable EscapeMark): Bool
135 if escapemark
!= null and self.escapemark
== escapemark
then
136 self.escapemark
= null
143 # Evaluate `n` as an expression in the current context.
144 # Return the value of the expression.
145 # If `n` cannot be evaluated, then aborts.
146 fun expr
(n
: AExpr): nullable Instance
148 var frame
= self.frame
149 var old
= frame
.current_node
150 frame
.current_node
= n
151 #n.debug("IN Execute expr")
153 if i
== null and not self.is_escaping
then
154 n
.debug
("inconsitance: no value and not escaping.")
156 var implicit_cast_to
= n
.implicit_cast_to
157 if implicit_cast_to
!= null then
158 var mtype
= self.unanchor_type
(implicit_cast_to
)
159 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
162 #n.debug("OUT Execute expr: value is {i}")
163 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
164 frame
.current_node
= old
168 # Evaluate `n` as a statement in the current context.
169 # Do nothing if `n` is null.
170 # If `n` cannot be evaluated, then aborts.
171 fun stmt
(n
: nullable AExpr)
174 var frame
= self.frame
175 var old
= frame
.current_node
176 frame
.current_node
= n
177 #n.debug("Execute stmt")
179 frame
.current_node
= old
183 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
184 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
186 # Return the boolean instance associated with `val`.
187 fun bool_instance
(val
: Bool): Instance
189 if val
then return self.true_instance
else return self.false_instance
192 # Return the integer instance associated with `val`.
193 fun int_instance
(val
: Int): Instance
195 var ic
= get_primitive_class
("Int")
196 var instance
= new PrimitiveInstance[Int](ic
.mclass_type
, val
)
197 init_instance_primitive
(instance
)
201 # Return the char instance associated with `val`.
202 fun char_instance
(val
: Char): Instance
204 var ic
= get_primitive_class
("Char")
205 var instance
= new PrimitiveInstance[Char](ic
.mclass_type
, val
)
206 init_instance_primitive
(instance
)
210 # Return the float instance associated with `val`.
211 fun float_instance
(val
: Float): Instance
213 var ic
= get_primitive_class
("Float")
214 var instance
= new PrimitiveInstance[Float](ic
.mclass_type
, val
)
215 init_instance_primitive
(instance
)
219 # The unique instance of the `true` value.
220 var true_instance
: Instance is noinit
222 # The unique instance of the `false` value.
223 var false_instance
: Instance is noinit
225 # The unique instance of the `null` value.
226 var null_instance
: Instance is noinit
228 # Return a new array made of `values`.
229 # The dynamic type of the result is Array[elttype].
230 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
232 assert not elttype
.need_anchor
233 var nat
= new PrimitiveInstance[Array[Instance]](get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
234 init_instance_primitive
(nat
)
235 var mtype
= get_primitive_class
("Array").get_mtype
([elttype
])
236 var res
= new MutableInstance(mtype
)
237 self.init_instance
(res
)
238 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
242 # Return a instance associated to a primitive class
243 # Current primitive classes are `Int`, `Bool`, and `String`
244 fun value_instance
(object
: Object): Instance
246 if object
isa Int then
247 return int_instance
(object
)
248 else if object
isa Bool then
249 return bool_instance
(object
)
250 else if object
isa String then
251 return string_instance
(object
)
257 # Return a new native string initialized with `txt`
258 fun native_string_instance
(txt
: String): Instance
260 var val
= new FlatBuffer.from
(txt
)
262 var ic
= get_primitive_class
("NativeString")
263 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
264 init_instance_primitive
(instance
)
268 # Return a new String instance for `txt`
269 fun string_instance
(txt
: String): Instance
271 var nat
= native_string_instance
(txt
)
272 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
277 # The current frame used to store local variables of the current method executed
278 fun frame
: Frame do return frames
.first
280 # The stack of all frames. The first one is the current one.
281 var frames
= new List[Frame]
283 # Return a stack trace. One line per function
284 fun stack_trace
: String
286 var b
= new FlatBuffer
287 b
.append
(",---- Stack trace -- - - -\n")
289 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
291 b
.append
("`------------------- - - -")
295 # Exit the program with a message
296 fun fatal
(message
: String)
298 if frames
.is_empty
then
301 self.frame
.current_node
.fatal
(self, message
)
306 # Debug on the current node
307 fun debug
(message
: String)
309 if frames
.is_empty
then
312 self.frame
.current_node
.debug
(message
)
316 # Retrieve the value of the variable in the current frame
317 fun read_variable
(v
: Variable): Instance
323 # Assign the value of the variable in the current frame
324 fun write_variable
(v
: Variable, value
: Instance)
330 # Store known methods, used to trace methods as they are reached
331 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
333 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
334 # This method is used to manage varargs in signatures and returns the real array
335 # of instances to use in the call.
336 # Return `null` if one of the evaluation of the arguments return null.
337 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
339 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
340 var res
= new Array[Instance]
343 if args
.is_empty
then return res
345 var vararg_rank
= msignature
.vararg_rank
346 var vararg_len
= args
.length
- msignature
.arity
347 if vararg_len
< 0 then vararg_len
= 0
349 for i
in [0..msignature
.arity
[ do
350 if i
== vararg_rank
then
352 if ne
isa AVarargExpr then
353 var e
= self.expr
(ne
.n_expr
)
354 if e
== null then return null
358 var vararg
= new Array[Instance]
359 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
360 var e
= self.expr
(args
[j
])
361 if e
== null then return null
364 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
365 res
.add
(self.array_instance
(vararg
, elttype
))
368 if i
> vararg_rank
then j
+= vararg_len
369 var e
= self.expr
(args
[j
])
370 if e
== null then return null
377 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
378 # Return a value if `mpropdef` is a function, or null if it is a procedure.
379 # The call is direct/static. There is no message-sending/late-binding.
380 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
382 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
383 self.discover_call_trace
.add mpropdef
384 self.debug
("Discovered {mpropdef}")
386 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
388 # Look for the AST node that implements the property
389 var mproperty
= mpropdef
.mproperty
390 var val
= mpropdef
.constant_value
391 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
392 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
393 self.parameter_check
(npropdef
, mpropdef
, args
)
394 return npropdef
.call
(self, mpropdef
, args
)
395 else if mproperty
.is_root_init
then
396 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
397 self.parameter_check
(nclassdef
, mpropdef
, args
)
398 return nclassdef
.call
(self, mpropdef
, args
)
399 else if val
!= null then
400 return value_instance
(val
)
402 fatal
("Fatal Error: method {mpropdef} not found in the AST")
407 # Generate type checks in the C code to check covariant parameters
408 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
410 var msignature
= mpropdef
.msignature
411 for i
in [0..msignature
.arity
[ do
412 # skip test for vararg since the array is instantiated with the correct polymorphic type
413 if msignature
.vararg_rank
== i
then continue
415 # skip if the cast is not required
416 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
417 if not origmtype
.need_anchor
then continue
419 # get the parameter type
420 var mtype
= msignature
.mparameters
[i
].mtype
421 var anchor
= args
.first
.mtype
.as(MClassType)
422 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
423 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
424 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
429 # Common code for runtime injected calls and normal calls
430 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
432 if mtype
isa MNullType then
433 if mproperty
.name
== "==" then
434 return self.bool_instance
(args
[0] == args
[1])
435 else if mproperty
.name
== "!=" then
436 return self.bool_instance
(args
[0] != args
[1])
438 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
439 fatal
("Receiver is null")
444 # Execute a full `callsite` for given `args`
445 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
446 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
448 var initializers
= callsite
.mpropdef
.initializers
449 if not initializers
.is_empty
then
450 var recv
= arguments
.first
452 for p
in initializers
do
453 if p
isa MMethod then
455 for x
in p
.intro
.msignature
.mparameters
do
456 args
.add arguments
[i
]
460 else if p
isa MAttribute then
461 assert recv
isa MutableInstance
462 recv
.attributes
[p
] = arguments
[i
]
466 assert i
== arguments
.length
468 return send
(callsite
.mproperty
, [recv
])
470 return send
(callsite
.mproperty
, arguments
)
473 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
474 # Return a value if `mproperty` is a function, or null if it is a procedure.
475 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
476 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
478 var recv
= args
.first
479 var mtype
= recv
.mtype
480 var ret
= send_commons
(mproperty
, args
, mtype
)
481 if ret
!= null then return ret
482 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
483 return self.call
(propdef
, args
)
486 # Read the attribute `mproperty` of an instance `recv` and return its value.
487 # If the attribute in not yet initialized, then aborts with an error message.
488 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
490 assert recv
isa MutableInstance
491 if not recv
.attributes
.has_key
(mproperty
) then
492 fatal
("Uninitialized attribute {mproperty.name}")
495 return recv
.attributes
[mproperty
]
498 # Replace in `recv` the value of the attribute `mproperty` by `value`
499 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
501 assert recv
isa MutableInstance
502 recv
.attributes
[mproperty
] = value
505 # Is the attribute `mproperty` initialized the instance `recv`?
506 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
508 assert recv
isa MutableInstance
509 return recv
.attributes
.has_key
(mproperty
)
512 # Collect attributes of a type in the order of their init
513 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
515 var cache
= self.collect_attr_propdef_cache
516 if cache
.has_key
(mtype
) then return cache
[mtype
]
518 var res
= new Array[AAttrPropdef]
519 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
520 self.mainmodule
.linearize_mclassdefs
(cds
)
522 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
523 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
524 for npropdef
in n
.n_propdefs
do
525 if npropdef
isa AAttrPropdef then
535 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
537 # Fill the initial values of the newly created instance `recv`.
538 # `recv.mtype` is used to know what must be filled.
539 fun init_instance
(recv
: Instance)
541 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
542 npropdef
.init_expr
(self, recv
)
546 # A hook to initialize a `PrimitiveInstance`
547 fun init_instance_primitive
(recv
: Instance) do end
549 # Return the primitive `MClass` corresponding to the `name` given in parameter
550 # `name` : name of the primitive class
551 fun get_primitive_class
(name
: String): MClass
553 return mainmodule
.get_primitive_class
(name
)
556 # This function determine the correct type according the reciever of the current definition (self).
557 fun unanchor_type
(mtype
: MType): MType
559 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
562 # Placebo instance used to mark internal error result when `null` already have a meaning.
563 # TODO: replace with multiple return or something better
564 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
567 # An instance represents a value of the executed program.
568 abstract class Instance
569 # The dynamic type of the instance
570 # ASSERT: not self.mtype.is_anchored
573 # return true if the instance is the true value.
574 # return false if the instance is the true value.
576 fun is_true
: Bool do abort
578 # Return true if `self` IS `o` (using the Nit semantic of is)
579 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
581 # Human readable object identity "Type#number"
582 redef fun to_s
do return "{mtype}"
584 # Return the integer value if the instance is an integer.
586 fun to_i
: Int do abort
588 # Return the integer value if the instance is a float.
590 fun to_f
: Float do abort
592 # The real value encapsulated if the instance is primitive.
594 fun val
: Object do abort
597 # A instance with attribute (standards objects)
598 class MutableInstance
601 # The values of the attributes
602 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
605 # Special instance to handle primitives values (int, bool, etc.)
606 # The trick it just to encapsulate the <<real>> value
607 class PrimitiveInstance[E
: Object]
610 # The real value encapsulated
615 if val
== true then return true
616 if val
== false then return false
622 if not o
isa PrimitiveInstance[Object] then return false
623 return self.val
== o
.val
628 if not o
isa PrimitiveInstance[Object] then return false
629 return self.val
.is_same_instance
(o
.val
)
632 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
634 redef fun to_i
do return val
.as(Int)
636 redef fun to_f
do return val
.as(Float)
639 # Information about local variables in a running method
641 # The current visited node
642 # The node is stored by frame to keep a stack trace
643 var current_node
: ANode
644 # The executed property.
645 # A Method in case of a call, an attribute in case of a default initialization.
646 var mpropdef
: MPropDef
647 # Arguments of the method (the first is the receiver)
648 var arguments
: Array[Instance]
649 # Mapping between a variable and the current value
650 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
654 # Aborts the program with a message
655 # `v` is used to know if a colored message is displayed or not
656 fun fatal
(v
: NaiveInterpreter, message
: String)
658 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
659 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
661 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
662 sys
.stderr
.write
(v
.stack_trace
)
663 sys
.stderr
.write
("\n")
670 # Execute a `mpropdef` associated with the current node.
671 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
673 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
678 redef class AMethPropdef
681 redef fun call
(v
, mpropdef
, args
)
683 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
684 var res
= call_commons
(v
, mpropdef
, args
, f
)
686 if v
.returnmark
== f
then
695 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
699 for i
in [0..mpropdef
.msignature
.arity
[ do
700 var variable
= self.n_signature
.n_params
[i
].variable
701 assert variable
!= null
702 v
.write_variable
(variable
, arguments
[i
+1])
705 if mpropdef
.is_abstract
then
706 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
710 # Call the implicit super-init
711 var auto_super_inits
= self.auto_super_inits
712 if auto_super_inits
!= null then
713 var args
= [arguments
.first
]
714 for auto_super_init
in auto_super_inits
do
716 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
717 args
.add
(arguments
[i
])
719 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
720 v
.callsite
(auto_super_init
, args
)
723 if auto_super_call
then
724 # standard call-next-method
725 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
726 v
.call
(superpd
, arguments
)
729 if mpropdef
.is_intern
or mpropdef
.is_extern
then
730 var res
= intern_call
(v
, mpropdef
, arguments
)
731 if res
!= v
.error_instance
then return res
734 if n_block
!= null then
739 if mpropdef
.is_intern
then
740 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
741 else if mpropdef
.is_extern
then
742 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
744 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
749 # Interprets a intern or a shortcut extern method.
750 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
751 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
753 var pname
= mpropdef
.mproperty
.name
754 var cname
= mpropdef
.mclassdef
.mclass
.name
755 if pname
== "output" then
756 var recv
= args
.first
759 else if pname
== "object_id" then
760 var recv
= args
.first
761 if recv
isa PrimitiveInstance[Object] then
762 return v
.int_instance
(recv
.val
.object_id
)
764 return v
.int_instance
(recv
.object_id
)
766 else if pname
== "output_class_name" then
767 var recv
= args
.first
770 else if pname
== "native_class_name" then
771 var recv
= args
.first
772 var txt
= recv
.mtype
.to_s
773 return v
.native_string_instance
(txt
)
774 else if pname
== "==" then
775 # == is correctly redefined for instances
776 return v
.bool_instance
(args
[0] == args
[1])
777 else if pname
== "!=" then
778 return v
.bool_instance
(args
[0] != args
[1])
779 else if pname
== "is_same_type" then
780 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
781 else if pname
== "is_same_instance" then
782 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
783 else if pname
== "exit" then
786 else if pname
== "sys" then
788 else if cname
== "Int" then
789 var recvval
= args
[0].to_i
790 if pname
== "unary -" then
791 return v
.int_instance
(-args
[0].to_i
)
792 else if pname
== "+" then
793 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
794 else if pname
== "-" then
795 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
796 else if pname
== "*" then
797 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
798 else if pname
== "%" then
799 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
800 else if pname
== "/" then
801 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
802 else if pname
== "<" then
803 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
804 else if pname
== ">" then
805 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
806 else if pname
== "<=" then
807 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
808 else if pname
== ">=" then
809 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
810 else if pname
== "<=>" then
811 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
812 else if pname
== "ascii" then
813 return v
.char_instance
(args
[0].to_i
.ascii
)
814 else if pname
== "to_f" then
815 return v
.float_instance
(args
[0].to_i
.to_f
)
816 else if pname
== "lshift" then
817 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
818 else if pname
== "rshift" then
819 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
820 else if pname
== "rand" then
821 var res
= recvval
.rand
822 return v
.int_instance
(res
)
823 else if pname
== "bin_and" then
824 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
825 else if pname
== "bin_or" then
826 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
827 else if pname
== "bin_xor" then
828 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
829 else if pname
== "bin_not" then
830 return v
.int_instance
(args
[0].to_i
.bin_not
)
831 else if pname
== "native_int_to_s" then
832 return v
.native_string_instance
(recvval
.to_s
)
833 else if pname
== "strerror_ext" then
834 return v
.native_string_instance
(recvval
.strerror
)
836 else if cname
== "Char" then
837 var recv
= args
[0].val
.as(Char)
838 if pname
== "ascii" then
839 return v
.int_instance
(recv
.ascii
)
840 else if pname
== "successor" then
841 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
842 else if pname
== "predecessor" then
843 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
844 else if pname
== "<" then
845 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
846 else if pname
== ">" then
847 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
848 else if pname
== "<=" then
849 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
850 else if pname
== ">=" then
851 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
852 else if pname
== "<=>" then
853 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
855 else if cname
== "Float" then
856 var recv
= args
[0].to_f
857 if pname
== "unary -" then
858 return v
.float_instance
(-recv
)
859 else if pname
== "+" then
860 return v
.float_instance
(recv
+ args
[1].to_f
)
861 else if pname
== "-" then
862 return v
.float_instance
(recv
- args
[1].to_f
)
863 else if pname
== "*" then
864 return v
.float_instance
(recv
* args
[1].to_f
)
865 else if pname
== "/" then
866 return v
.float_instance
(recv
/ args
[1].to_f
)
867 else if pname
== "<" then
868 return v
.bool_instance
(recv
< args
[1].to_f
)
869 else if pname
== ">" then
870 return v
.bool_instance
(recv
> args
[1].to_f
)
871 else if pname
== "<=" then
872 return v
.bool_instance
(recv
<= args
[1].to_f
)
873 else if pname
== ">=" then
874 return v
.bool_instance
(recv
>= args
[1].to_f
)
875 else if pname
== "to_i" then
876 return v
.int_instance
(recv
.to_i
)
877 else if pname
== "cos" then
878 return v
.float_instance
(args
[0].to_f
.cos
)
879 else if pname
== "sin" then
880 return v
.float_instance
(args
[0].to_f
.sin
)
881 else if pname
== "tan" then
882 return v
.float_instance
(args
[0].to_f
.tan
)
883 else if pname
== "acos" then
884 return v
.float_instance
(args
[0].to_f
.acos
)
885 else if pname
== "asin" then
886 return v
.float_instance
(args
[0].to_f
.asin
)
887 else if pname
== "atan" then
888 return v
.float_instance
(args
[0].to_f
.atan
)
889 else if pname
== "sqrt" then
890 return v
.float_instance
(args
[0].to_f
.sqrt
)
891 else if pname
== "exp" then
892 return v
.float_instance
(args
[0].to_f
.exp
)
893 else if pname
== "log" then
894 return v
.float_instance
(args
[0].to_f
.log
)
895 else if pname
== "pow" then
896 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
897 else if pname
== "rand" then
898 return v
.float_instance
(args
[0].to_f
.rand
)
899 else if pname
== "abs" then
900 return v
.float_instance
(args
[0].to_f
.abs
)
901 else if pname
== "hypot_with" then
902 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
903 else if pname
== "is_nan" then
904 return v
.bool_instance
(args
[0].to_f
.is_nan
)
905 else if pname
== "is_inf_extern" then
906 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
907 else if pname
== "round" then
908 return v
.float_instance
(args
[0].to_f
.round
)
910 else if cname
== "NativeString" then
911 if pname
== "new" then
912 return v
.native_string_instance
("!" * args
[1].to_i
)
914 var recvval
= args
.first
.val
.as(Buffer)
915 if pname
== "[]" then
916 var arg1
= args
[1].to_i
917 if arg1
>= recvval
.length
or arg1
< 0 then
918 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
920 return v
.char_instance
(recvval
.chars
[arg1
])
921 else if pname
== "[]=" then
922 var arg1
= args
[1].to_i
923 if arg1
>= recvval
.length
or arg1
< 0 then
924 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
926 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
928 else if pname
== "copy_to" then
929 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
930 var destval
= args
[1].val
.as(FlatBuffer)
931 var lenval
= args
[2].to_i
932 var fromval
= args
[3].to_i
933 var toval
= args
[4].to_i
935 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
937 if fromval
+ lenval
>= recvval
.length
then
938 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
941 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
943 if toval
+ lenval
>= destval
.length
then
944 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
946 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
948 else if pname
== "atoi" then
949 return v
.int_instance
(recvval
.to_i
)
950 else if pname
== "file_exists" then
951 return v
.bool_instance
(recvval
.to_s
.file_exists
)
952 else if pname
== "file_mkdir" then
955 else if pname
== "file_chdir" then
958 else if pname
== "file_realpath" then
959 return v
.native_string_instance
(recvval
.to_s
.realpath
)
960 else if pname
== "get_environ" then
961 var txt
= recvval
.to_s
.environ
962 return v
.native_string_instance
(txt
)
963 else if pname
== "system" then
964 var res
= sys
.system
(recvval
.to_s
)
965 return v
.int_instance
(res
)
966 else if pname
== "atof" then
967 return v
.float_instance
(recvval
.to_f
)
969 else if cname
== "String" then
970 var cs
= v
.send
(v
.force_get_primitive_method
("to_cstring", args
.first
.mtype
), [args
.first
])
971 var str
= cs
.val
.to_s
972 if pname
== "files" then
973 var res
= new Array[Instance]
974 for f
in str
.files
do res
.add v
.string_instance
(f
)
975 return v
.array_instance
(res
, v
.get_primitive_class
("String").mclass_type
)
977 else if pname
== "calloc_string" then
978 return v
.native_string_instance
("!" * args
[1].to_i
)
979 else if cname
== "NativeArray" then
980 if pname
== "new" then
981 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
982 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
983 v
.init_instance_primitive
(instance
)
986 var recvval
= args
.first
.val
.as(Array[Instance])
987 if pname
== "[]" then
988 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
989 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
991 return recvval
[args
[1].to_i
]
992 else if pname
== "[]=" then
993 recvval
[args
[1].to_i
] = args
[2]
995 else if pname
== "length" then
996 return v
.int_instance
(recvval
.length
)
997 else if pname
== "copy_to" then
998 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1001 else if cname
== "NativeFile" then
1002 if pname
== "native_stdout" then
1003 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
1004 v
.init_instance_primitive
(instance
)
1006 else if pname
== "native_stdin" then
1007 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
1008 v
.init_instance_primitive
(instance
)
1010 else if pname
== "native_stderr" then
1011 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
1012 v
.init_instance_primitive
(instance
)
1014 else if pname
== "io_open_read" then
1015 var a1
= args
[1].val
.as(Buffer)
1016 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
1017 v
.init_instance_primitive
(instance
)
1019 else if pname
== "io_open_write" then
1020 var a1
= args
[1].val
.as(Buffer)
1021 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
1022 v
.init_instance_primitive
(instance
)
1025 var recvval
= args
.first
.val
1026 if pname
== "io_write" then
1027 var a1
= args
[1].val
.as(Buffer)
1028 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
1030 else if pname
== "io_read" then
1031 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
1032 var a1
= args
[1].val
.as(Buffer)
1033 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
1034 return v
.int_instance
(str
.length
)
1035 else if pname
== "io_close" then
1036 recvval
.as(IOS).close
1037 return v
.int_instance
(0)
1038 else if pname
== "address_is_null" then
1039 return v
.false_instance
1041 else if pname
== "calloc_array" then
1042 var recvtype
= args
.first
.mtype
.as(MClassType)
1044 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1045 mtype
= mtype
.arguments
.first
1046 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1047 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1048 v
.init_instance_primitive
(instance
)
1050 else if pname
== "native_argc" then
1051 return v
.int_instance
(v
.arguments
.length
)
1052 else if pname
== "native_argv" then
1053 var txt
= v
.arguments
[args
[1].to_i
]
1054 return v
.native_string_instance
(txt
)
1055 else if pname
== "native_argc" then
1056 return v
.int_instance
(v
.arguments
.length
)
1057 else if pname
== "native_argv" then
1058 var txt
= v
.arguments
[args
[1].to_i
]
1059 return v
.native_string_instance
(txt
)
1060 else if pname
== "get_time" then
1061 return v
.int_instance
(get_time
)
1062 else if pname
== "srand" then
1065 else if pname
== "srand_from" then
1066 srand_from
(args
[1].to_i
)
1068 else if pname
== "atan2" then
1069 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1070 else if pname
== "pi" then
1071 return v
.float_instance
(pi
)
1072 else if pname
== "lexer_goto" then
1073 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1074 else if pname
== "lexer_accept" then
1075 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1076 else if pname
== "parser_goto" then
1077 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1078 else if pname
== "parser_action" then
1079 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1080 else if pname
== "file_getcwd" then
1081 return v
.native_string_instance
(getcwd
)
1082 else if pname
== "errno" then
1083 return v
.int_instance
(sys
.errno
)
1084 else if pname
== "address_is_null" then
1085 return v
.false_instance
1087 return v
.error_instance
1091 redef class AAttrPropdef
1092 redef fun call
(v
, mpropdef
, args
)
1094 var recv
= args
.first
1095 assert recv
isa MutableInstance
1096 var attr
= self.mpropdef
.mproperty
1097 if mpropdef
== mreadpropdef
then
1098 assert args
.length
== 1
1099 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1100 return evaluate_expr
(v
, recv
)
1101 else if mpropdef
== mwritepropdef
then
1102 assert args
.length
== 2
1103 v
.write_attribute
(attr
, recv
, args
[1])
1110 # Evaluate and set the default value of the attribute in `recv`
1111 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1113 if is_lazy
then return
1115 evaluate_expr
(v
, recv
)
1118 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1119 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1120 if mtype
isa MNullableType then
1121 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1125 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1127 assert recv
isa MutableInstance
1128 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1133 var nexpr
= self.n_expr
1134 var nblock
= self.n_block
1135 if nexpr
!= null then
1137 else if nblock
!= null then
1139 assert v
.returnmark
== f
1142 v
.escapevalue
= null
1149 assert not v
.is_escaping
1150 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1155 redef class AClassdef
1156 # Execute an implicit `mpropdef` associated with the current node.
1157 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1159 if mpropdef
.mproperty
.is_root_init
then
1160 assert args
.length
== 1
1161 if not mpropdef
.is_intro
then
1162 # standard call-next-method
1163 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1164 v
.call
(superpd
, args
)
1174 # Evaluate the node as a possible expression.
1175 # Return a possible value
1176 # NOTE: Do not call this method directly, but use `v.expr`
1177 # This method is here to be implemented by subclasses.
1178 private fun expr
(v
: NaiveInterpreter): nullable Instance
1180 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1184 # Evaluate the node as a statement.
1185 # NOTE: Do not call this method directly, but use `v.stmt`
1186 # This method is here to be implemented by subclasses (no need to return something).
1187 private fun stmt
(v
: NaiveInterpreter)
1194 redef class ABlockExpr
1197 var last
= self.n_expr
.last
1198 for e
in self.n_expr
do
1199 if e
== last
then break
1201 if v
.is_escaping
then return null
1208 for e
in self.n_expr
do
1210 if v
.is_escaping
then return
1215 redef class AVardeclExpr
1218 var ne
= self.n_expr
1221 if i
== null then return
1222 v
.write_variable
(self.variable
.as(not null), i
)
1227 redef class AVarExpr
1230 return v
.read_variable
(self.variable
.as(not null))
1234 redef class AVarAssignExpr
1237 var i
= v
.expr
(self.n_value
)
1238 if i
== null then return null
1239 v
.write_variable
(self.variable
.as(not null), i
)
1244 redef class AVarReassignExpr
1247 var variable
= self.variable
.as(not null)
1248 var vari
= v
.read_variable
(variable
)
1249 var value
= v
.expr
(self.n_value
)
1250 if value
== null then return
1251 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1253 v
.write_variable
(variable
, res
)
1257 redef class ASelfExpr
1260 return v
.frame
.arguments
.first
1264 redef class AEscapeExpr
1267 var ne
= self.n_expr
1270 if i
== null then return
1273 v
.escapemark
= self.escapemark
1277 redef class AReturnExpr
1280 var ne
= self.n_expr
1283 if i
== null then return
1286 v
.returnmark
= v
.frame
1290 redef class AAbortExpr
1301 var cond
= v
.expr
(self.n_expr
)
1302 if cond
== null then return null
1303 if cond
.is_true
then
1304 return v
.expr
(self.n_then
.as(not null))
1306 return v
.expr
(self.n_else
.as(not null))
1312 var cond
= v
.expr
(self.n_expr
)
1313 if cond
== null then return
1314 if cond
.is_true
then
1322 redef class AIfexprExpr
1325 var cond
= v
.expr
(self.n_expr
)
1326 if cond
== null then return null
1327 if cond
.is_true
then
1328 return v
.expr
(self.n_then
)
1330 return v
.expr
(self.n_else
)
1338 v
.stmt
(self.n_block
)
1339 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1343 redef class AWhileExpr
1347 var cond
= v
.expr
(self.n_expr
)
1348 if cond
== null then return
1349 if not cond
.is_true
then return
1350 v
.stmt
(self.n_block
)
1351 if v
.is_escape
(self.break_mark
) then return
1352 v
.is_escape
(self.continue_mark
) # Clear the break
1353 if v
.is_escaping
then return
1358 redef class ALoopExpr
1362 v
.stmt
(self.n_block
)
1363 if v
.is_escape
(self.break_mark
) then return
1364 v
.is_escape
(self.continue_mark
) # Clear the break
1365 if v
.is_escaping
then return
1370 redef class AForExpr
1373 var col
= v
.expr
(self.n_expr
)
1374 if col
== null then return
1375 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1377 #self.debug("col {col}")
1378 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1379 #self.debug("iter {iter}")
1381 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1382 if not isok
.is_true
then break
1383 if self.variables
.length
== 1 then
1384 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1385 #self.debug("item {item}")
1386 v
.write_variable
(self.variables
.first
, item
)
1387 else if self.variables
.length
== 2 then
1388 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1389 v
.write_variable
(self.variables
[0], key
)
1390 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1391 v
.write_variable
(self.variables
[1], item
)
1395 v
.stmt
(self.n_block
)
1396 if v
.is_escape
(self.break_mark
) then break
1397 v
.is_escape
(self.continue_mark
) # Clear the break
1398 if v
.is_escaping
then break
1399 v
.callsite
(method_next
, [iter
])
1401 var method_finish
= self.method_finish
1402 if method_finish
!= null then
1403 v
.callsite
(method_finish
, [iter
])
1408 redef class AAssertExpr
1411 var cond
= v
.expr
(self.n_expr
)
1412 if cond
== null then return
1413 if not cond
.is_true
then
1415 if v
.is_escaping
then return
1418 fatal
(v
, "Assert '{nid.text}' failed")
1420 fatal
(v
, "Assert failed")
1430 var cond
= v
.expr
(self.n_expr
)
1431 if cond
== null then return null
1432 if cond
.is_true
then return cond
1433 return v
.expr
(self.n_expr2
)
1437 redef class AImpliesExpr
1440 var cond
= v
.expr
(self.n_expr
)
1441 if cond
== null then return null
1442 if not cond
.is_true
then return v
.true_instance
1443 return v
.expr
(self.n_expr2
)
1447 redef class AAndExpr
1450 var cond
= v
.expr
(self.n_expr
)
1451 if cond
== null then return null
1452 if not cond
.is_true
then return cond
1453 return v
.expr
(self.n_expr2
)
1457 redef class ANotExpr
1460 var cond
= v
.expr
(self.n_expr
)
1461 if cond
== null then return null
1462 return v
.bool_instance
(not cond
.is_true
)
1466 redef class AOrElseExpr
1469 var i
= v
.expr
(self.n_expr
)
1470 if i
== null then return null
1471 if i
!= v
.null_instance
then return i
1472 return v
.expr
(self.n_expr2
)
1476 redef class AIntExpr
1479 return v
.int_instance
(self.value
.as(not null))
1483 redef class AFloatExpr
1486 return v
.float_instance
(self.value
.as(not null))
1490 redef class ACharExpr
1493 return v
.char_instance
(self.value
.as(not null))
1497 redef class AArrayExpr
1500 var val
= new Array[Instance]
1501 for nexpr
in self.n_exprs
.n_exprs
do
1502 var i
= v
.expr
(nexpr
)
1503 if i
== null then return null
1506 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1507 var elttype
= mtype
.arguments
.first
1508 return v
.array_instance
(val
, elttype
)
1512 redef class AStringFormExpr
1515 var txt
= self.value
.as(not null)
1516 return v
.string_instance
(txt
)
1520 redef class ASuperstringExpr
1523 var array
= new Array[Instance]
1524 for nexpr
in n_exprs
do
1525 var i
= v
.expr
(nexpr
)
1526 if i
== null then return null
1529 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1530 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1536 redef class ACrangeExpr
1539 var e1
= v
.expr
(self.n_expr
)
1540 if e1
== null then return null
1541 var e2
= v
.expr
(self.n_expr2
)
1542 if e2
== null then return null
1543 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1544 var res
= new MutableInstance(mtype
)
1545 v
.init_instance
(res
)
1546 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1551 redef class AOrangeExpr
1554 var e1
= v
.expr
(self.n_expr
)
1555 if e1
== null then return null
1556 var e2
= v
.expr
(self.n_expr2
)
1557 if e2
== null then return null
1558 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1559 var res
= new MutableInstance(mtype
)
1560 v
.init_instance
(res
)
1561 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1566 redef class ATrueExpr
1569 return v
.bool_instance
(true)
1573 redef class AFalseExpr
1576 return v
.bool_instance
(false)
1580 redef class ANullExpr
1583 return v
.null_instance
1587 redef class AIsaExpr
1590 var i
= v
.expr
(self.n_expr
)
1591 if i
== null then return null
1592 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1593 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1597 redef class AAsCastExpr
1600 var i
= v
.expr
(self.n_expr
)
1601 if i
== null then return null
1602 var mtype
= self.mtype
.as(not null)
1603 var amtype
= v
.unanchor_type
(mtype
)
1604 if not v
.is_subtype
(i
.mtype
, amtype
) then
1605 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1611 redef class AAsNotnullExpr
1614 var i
= v
.expr
(self.n_expr
)
1615 if i
== null then return null
1616 if i
.mtype
isa MNullType then
1617 fatal
(v
, "Cast failed")
1623 redef class AParExpr
1626 return v
.expr
(self.n_expr
)
1630 redef class AOnceExpr
1633 if v
.onces
.has_key
(self) then
1634 return v
.onces
[self]
1636 var res
= v
.expr
(self.n_expr
)
1637 if res
== null then return null
1644 redef class ASendExpr
1647 var recv
= v
.expr
(self.n_expr
)
1648 if recv
== null then return null
1649 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1650 if args
== null then return null
1652 var res
= v
.callsite
(callsite
, args
)
1657 redef class ASendReassignFormExpr
1660 var recv
= v
.expr
(self.n_expr
)
1661 if recv
== null then return
1662 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1663 if args
== null then return
1664 var value
= v
.expr
(self.n_value
)
1665 if value
== null then return
1667 var read
= v
.callsite
(callsite
, args
)
1670 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1671 assert write
!= null
1675 v
.callsite
(write_callsite
, args
)
1679 redef class ASuperExpr
1682 var recv
= v
.frame
.arguments
.first
1684 var callsite
= self.callsite
1685 if callsite
!= null then
1686 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1687 if args
== null then return null
1688 # Add additional arguments for the super init call
1689 if args
.length
== 1 then
1690 for i
in [0..callsite
.msignature
.arity
[ do
1691 args
.add
(v
.frame
.arguments
[i
+1])
1695 var res
= v
.callsite
(callsite
, args
)
1699 # standard call-next-method
1700 var mpropdef
= self.mpropdef
1701 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1703 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1704 if args
== null then return null
1706 if args
.length
== 1 then
1707 args
= v
.frame
.arguments
1709 var res
= v
.call
(mpropdef
, args
)
1714 redef class ANewExpr
1717 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1718 var recv
: Instance = new MutableInstance(mtype
)
1719 v
.init_instance
(recv
)
1720 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1721 if args
== null then return null
1722 var res2
= v
.callsite
(callsite
, args
)
1723 if res2
!= null then
1724 #self.debug("got {res2} from {mproperty}. drop {recv}")
1731 redef class AAttrExpr
1734 var recv
= v
.expr
(self.n_expr
)
1735 if recv
== null then return null
1736 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1737 var mproperty
= self.mproperty
.as(not null)
1738 return v
.read_attribute
(mproperty
, recv
)
1742 redef class AAttrAssignExpr
1745 var recv
= v
.expr
(self.n_expr
)
1746 if recv
== null then return
1747 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1748 var i
= v
.expr
(self.n_value
)
1749 if i
== null then return
1750 var mproperty
= self.mproperty
.as(not null)
1751 v
.write_attribute
(mproperty
, recv
, i
)
1755 redef class AAttrReassignExpr
1758 var recv
= v
.expr
(self.n_expr
)
1759 if recv
== null then return
1760 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1761 var value
= v
.expr
(self.n_value
)
1762 if value
== null then return
1763 var mproperty
= self.mproperty
.as(not null)
1764 var attr
= v
.read_attribute
(mproperty
, recv
)
1765 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1767 v
.write_attribute
(mproperty
, recv
, res
)
1771 redef class AIssetAttrExpr
1774 var recv
= v
.expr
(self.n_expr
)
1775 if recv
== null then return null
1776 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1777 var mproperty
= self.mproperty
.as(not null)
1778 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1782 redef class ADebugTypeExpr