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
: OptionBool = 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 moduleof the program (used to lookup methoda
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 var mainobj
: nullable Instance
71 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
73 self.modelbuilder
= modelbuilder
74 self.mainmodule
= mainmodule
75 self.arguments
= arguments
76 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
77 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
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 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
108 assert recv
isa MClassType
109 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
112 # Is a return executed?
113 # Set this mark to skip the evaluation until the end of the specified method frame
114 var returnmark
: nullable Frame = null
116 # Is a break executed?
117 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
118 var breakmark
: nullable EscapeMark = null
120 # Is a continue executed?
121 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
122 var continuemark
: 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 breakmark
!= null or continuemark
!= 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 and is associated with `escapemark`, then return true an clear the mark.
134 # If there is no break or if `escapemark` is null then return false.
135 # Use this function to catch a potential break.
136 fun is_break
(escapemark
: nullable EscapeMark): Bool
138 if escapemark
!= null and self.breakmark
== escapemark
then
139 self.breakmark
= null
146 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
147 # If there is no continue or if `escapemark` is null then return false.
148 # Use this function to catch a potential continue.
149 fun is_continue
(escapemark
: nullable EscapeMark): Bool
151 if escapemark
!= null and self.continuemark
== escapemark
then
152 self.continuemark
= null
159 # Evaluate `n` as an expression in the current context.
160 # Return the value of the expression.
161 # If `n` cannot be evaluated, then aborts.
162 fun expr
(n
: AExpr): nullable Instance
164 var frame
= self.frame
165 var old
= frame
.current_node
166 frame
.current_node
= n
167 #n.debug("IN Execute expr")
169 if i
== null and not self.is_escaping
then
170 n
.debug
("inconsitance: no value and not escaping.")
172 var implicit_cast_to
= n
.implicit_cast_to
173 if implicit_cast_to
!= null then
174 var mtype
= self.unanchor_type
(implicit_cast_to
)
175 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
178 #n.debug("OUT Execute expr: value is {i}")
179 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
180 frame
.current_node
= old
184 # Evaluate `n` as a statement in the current context.
185 # Do nothing if `n` is null.
186 # If `n` cannot be evaluated, then aborts.
187 fun stmt
(n
: nullable AExpr)
190 var frame
= self.frame
191 var old
= frame
.current_node
192 frame
.current_node
= n
193 #n.debug("Execute stmt")
195 frame
.current_node
= old
199 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
200 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
202 # Return the boolean instance associated with `val`.
203 fun bool_instance
(val
: Bool): Instance
205 if val
then return self.true_instance
else return self.false_instance
208 # Return the integer instance associated with `val`.
209 fun int_instance
(val
: Int): Instance
211 var ic
= self.mainmodule
.get_primitive_class
("Int")
212 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
215 # Return the char instance associated with `val`.
216 fun char_instance
(val
: Char): Instance
218 var ic
= self.mainmodule
.get_primitive_class
("Char")
219 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
222 # Return the float instance associated with `val`.
223 fun float_instance
(val
: Float): Instance
225 var ic
= self.mainmodule
.get_primitive_class
("Float")
226 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
229 # The unique intance of the `true` value.
230 var true_instance
: Instance
232 # The unique intance of the `false` value.
233 var false_instance
: Instance
235 # The unique intance of the `null` value.
236 var null_instance
: Instance
238 # Return a new array made of `values`.
239 # The dynamic type of the result is Array[elttype].
240 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
242 assert not elttype
.need_anchor
243 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
244 var mtype
= self.mainmodule
.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 new native string initialized with `txt`
252 fun native_string_instance
(txt
: String): Instance
254 var val
= new FlatBuffer.from
(txt
)
256 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
257 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
260 # Return a new String instance for `txt`
261 fun string_instance
(txt
: String): Instance
263 var nat
= native_string_instance
(txt
)
264 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
269 # The current frame used to store local variables of the current method executed
270 fun frame
: Frame do return frames
.first
272 # The stack of all frames. The first one is the current one.
273 var frames
: List[Frame] = new List[Frame]
275 # Return a stack stace. One line per function
276 fun stack_trace
: String
278 var b
= new FlatBuffer
279 b
.append
(",---- Stack trace -- - - -\n")
281 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
283 b
.append
("`------------------- - - -")
287 # Exit the program with a message
288 fun fatal
(message
: String)
290 if frames
.is_empty
then
293 self.frame
.current_node
.fatal
(self, message
)
298 # Debug on the current node
299 fun debug
(message
: String)
301 if frames
.is_empty
then
304 self.frame
.current_node
.debug
(message
)
308 # Retrieve the value of the variable in the current frame
309 fun read_variable
(v
: Variable): Instance
315 # Assign the value of the variable in the current frame
316 fun write_variable
(v
: Variable, value
: Instance)
322 # Store known method, used to trace methods as thez are reached
323 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
325 # Common code for calls to injected methods and normal methods
326 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
328 var vararg_rank
= mpropdef
.msignature
.vararg_rank
329 if vararg_rank
>= 0 then
330 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
332 args
= new Array[Instance]
334 args
.add
(rawargs
.first
) # recv
336 for i
in [0..vararg_rank
[ do
337 args
.add
(rawargs
[i
+1])
340 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
341 var vararg
= new Array[Instance]
342 for i
in [vararg_rank
..vararg_lastrank
] do
343 vararg
.add
(rawargs
[i
+1])
345 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
346 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
347 args
.add
(self.array_instance
(vararg
, elttype
))
349 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
350 args
.add
(rawargs
[i
+1])
356 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
357 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
358 # The call is direct/static. There is no message-seding/late-binding.
359 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
361 args
= call_commons
(mpropdef
, args
)
362 return call_without_varargs
(mpropdef
, args
)
365 # Common code to call and this function
367 # Call only executes the variadic part, this avoids
368 # double encapsulation of variadic parameters into an Array
369 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
371 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
372 self.discover_call_trace
.add mpropdef
373 self.debug
("Discovered {mpropdef}")
375 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
377 # Look for the AST node that implements the property
378 var mproperty
= mpropdef
.mproperty
379 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
380 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
381 self.parameter_check
(npropdef
, mpropdef
, args
)
382 return npropdef
.call
(self, mpropdef
, args
)
383 else if mproperty
.name
== "init" then
384 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
385 self.parameter_check
(nclassdef
, mpropdef
, args
)
386 return nclassdef
.call
(self, mpropdef
, args
)
388 fatal
("Fatal Error: method {mpropdef} not found in the AST")
393 # Generate type checks in the C code to check covariant parameters
394 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
396 var msignature
= mpropdef
.msignature
397 for i
in [0..msignature
.arity
[ do
398 # skip test for vararg since the array is instantiated with the correct polymorphic type
399 if msignature
.vararg_rank
== i
then continue
401 # skip if the cast is not required
402 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
403 if not origmtype
.need_anchor
then continue
405 # get the parameter type
406 var mtype
= msignature
.mparameters
[i
].mtype
407 var anchor
= args
.first
.mtype
.as(MClassType)
408 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
409 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
410 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
415 # Common code for runtime injected calls and normal calls
416 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
418 if mtype
isa MNullType then
419 if mproperty
.name
== "==" then
420 return self.bool_instance
(args
[0] == args
[1])
421 else if mproperty
.name
== "!=" then
422 return self.bool_instance
(args
[0] != args
[1])
424 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
425 fatal
("Receiver is null")
430 # Execute a full `callsite` for given `args`
431 # Use this method, instead of `send` to execute and control the aditionnal behavior of the call-sites
432 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
434 var initializers
= callsite
.mpropdef
.initializers
435 if not initializers
.is_empty
then
436 var recv
= arguments
.first
438 for p
in initializers
do
439 if p
isa MMethod then
441 for x
in p
.intro
.msignature
.mparameters
do
442 args
.add arguments
[i
]
446 else if p
isa MAttribute then
447 assert recv
isa MutableInstance
448 recv
.attributes
[p
] = arguments
[i
]
452 assert i
== arguments
.length
454 return send
(callsite
.mproperty
, [recv
])
456 return send
(callsite
.mproperty
, arguments
)
459 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
460 # Return a falue if `mproperty` is a function, or null if it is a procedure.
461 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
462 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
464 var recv
= args
.first
465 var mtype
= recv
.mtype
466 var ret
= send_commons
(mproperty
, args
, mtype
)
467 if ret
!= null then return ret
468 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
469 return self.call
(propdef
, args
)
472 # Read the attribute `mproperty` of an instance `recv` and return its value.
473 # If the attribute in not yet initialized, then aborts with an error message.
474 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
476 assert recv
isa MutableInstance
477 if not recv
.attributes
.has_key
(mproperty
) then
478 fatal
("Uninitialized attribute {mproperty.name}")
481 return recv
.attributes
[mproperty
]
484 # Replace in `recv` the value of the attribute `mproperty` by `value`
485 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
487 assert recv
isa MutableInstance
488 recv
.attributes
[mproperty
] = value
491 # Is the attribute `mproperty` initialized the instance `recv`?
492 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
494 assert recv
isa MutableInstance
495 return recv
.attributes
.has_key
(mproperty
)
498 # Collect attributes of a type in the order of their init
499 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
501 var cache
= self.collect_attr_propdef_cache
502 if cache
.has_key
(mtype
) then return cache
[mtype
]
504 var res
= new Array[AAttrPropdef]
505 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
506 self.mainmodule
.linearize_mclassdefs
(cds
)
508 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
509 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
510 for npropdef
in n
.n_propdefs
do
511 if npropdef
isa AAttrPropdef then
521 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
523 # Fill the initial values of the newly created instance `recv`.
524 # `recv.mtype` is used to know what must be filled.
525 fun init_instance
(recv
: Instance)
527 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
528 npropdef
.init_expr
(self, recv
)
532 # This function determine the correct type according the reciever of the current definition (self).
533 fun unanchor_type
(mtype
: MType): MType
535 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
538 # Placebo instance used to mark internal error result when `null` already have a meaning.
539 # TODO: replace with multiple return or something better
540 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
543 # An instance represents a value of the executed program.
544 abstract class Instance
545 # The dynamic type of the instance
546 # ASSERT: not self.mtype.is_anchored
549 # return true if the instance is the true value.
550 # return false if the instance is the true value.
552 fun is_true
: Bool do abort
554 # Return true if `self` IS `o` (using the Nit semantic of is)
555 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
557 # Human readable object identity "Type#number"
558 redef fun to_s
do return "{mtype}"
560 # Return the integer value if the instance is an integer.
562 fun to_i
: Int do abort
564 # Return the integer value if the instance is a float.
566 fun to_f
: Float do abort
568 # The real value encapsulated if the instance is primitive.
570 fun val
: Object do abort
573 # A instance with attribute (standards objects)
574 class MutableInstance
577 # The values of the attributes
578 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
581 # Special instance to handle primitives values (int, bool, etc.)
582 # The trick it just to encapsulate the <<real>> value
583 class PrimitiveInstance[E
: Object]
586 # The real value encapsulated
589 init(mtype
: MType, val
: E
)
597 if val
== true then return true
598 if val
== false then return false
604 if not o
isa PrimitiveInstance[Object] then return false
605 return self.val
== o
.val
610 if not o
isa PrimitiveInstance[Object] then return false
611 return self.val
.is_same_instance
(o
.val
)
614 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
616 redef fun to_i
do return val
.as(Int)
618 redef fun to_f
do return val
.as(Float)
621 # Information about local variables in a running method
623 # The current visited node
624 # The node is stored by frame to keep a stack trace
625 var current_node
: ANode
626 # The executed property.
627 # A Method in case of a call, an attribute in case of a default initialization.
628 var mpropdef
: MPropDef
629 # Arguments of the method (the first is the receiver)
630 var arguments
: Array[Instance]
631 # Mapping between a variable and the current value
632 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
636 # Aborts the program with a message
637 # `v` is used to know if a colored message is displayed or not
638 fun fatal
(v
: NaiveInterpreter, message
: String)
640 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
641 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
643 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
644 sys
.stderr
.write
(v
.stack_trace
)
645 sys
.stderr
.write
("\n")
652 # Execute a `mpropdef` associated with the current node.
653 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
655 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
660 redef class AMethPropdef
663 redef fun call
(v
, mpropdef
, args
)
665 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
666 var res
= call_commons
(v
, mpropdef
, args
, f
)
668 if v
.returnmark
== f
then
677 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
681 for i
in [0..mpropdef
.msignature
.arity
[ do
682 var variable
= self.n_signature
.n_params
[i
].variable
683 assert variable
!= null
684 v
.write_variable
(variable
, arguments
[i
+1])
687 if mpropdef
.is_abstract
then
688 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
692 # Call the implicit super-init
693 var auto_super_inits
= self.auto_super_inits
694 if auto_super_inits
!= null then
695 var args
= [arguments
.first
]
696 for auto_super_init
in auto_super_inits
do
698 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
699 args
.add
(arguments
[i
])
701 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
702 v
.callsite
(auto_super_init
, args
)
705 if auto_super_call
then
706 # standard call-next-method
707 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
708 v
.call_without_varargs
(superpd
, arguments
)
711 if mpropdef
.is_intern
or mpropdef
.is_extern
then
712 var res
= intern_call
(v
, mpropdef
, arguments
)
713 if res
!= v
.error_instance
then return res
716 if n_block
!= null then
721 if mpropdef
.is_intern
then
722 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
723 else if mpropdef
.is_extern
then
724 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
726 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
731 # Interprets a intern or a shortcut extern method.
732 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
733 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
735 var pname
= mpropdef
.mproperty
.name
736 var cname
= mpropdef
.mclassdef
.mclass
.name
737 if pname
== "output" then
738 var recv
= args
.first
741 else if pname
== "object_id" then
742 var recv
= args
.first
743 if recv
isa PrimitiveInstance[Object] then
744 return v
.int_instance
(recv
.val
.object_id
)
746 return v
.int_instance
(recv
.object_id
)
748 else if pname
== "output_class_name" then
749 var recv
= args
.first
752 else if pname
== "native_class_name" then
753 var recv
= args
.first
754 var txt
= recv
.mtype
.to_s
755 return v
.native_string_instance
(txt
)
756 else if pname
== "==" then
757 # == is correclt redefined for instances
758 return v
.bool_instance
(args
[0] == args
[1])
759 else if pname
== "!=" then
760 return v
.bool_instance
(args
[0] != args
[1])
761 else if pname
== "is_same_type" then
762 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
763 else if pname
== "is_same_instance" then
764 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
765 else if pname
== "exit" then
768 else if pname
== "sys" then
770 else if cname
== "Int" then
771 var recvval
= args
[0].to_i
772 if pname
== "unary -" then
773 return v
.int_instance
(-args
[0].to_i
)
774 else if pname
== "+" then
775 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
776 else if pname
== "-" then
777 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
778 else if pname
== "*" then
779 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
780 else if pname
== "%" then
781 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
782 else if pname
== "/" then
783 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
784 else if pname
== "<" then
785 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
786 else if pname
== ">" then
787 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
788 else if pname
== "<=" then
789 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
790 else if pname
== ">=" then
791 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
792 else if pname
== "<=>" then
793 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
794 else if pname
== "ascii" then
795 return v
.char_instance
(args
[0].to_i
.ascii
)
796 else if pname
== "to_f" then
797 return v
.float_instance
(args
[0].to_i
.to_f
)
798 else if pname
== "lshift" then
799 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
800 else if pname
== "rshift" then
801 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
802 else if pname
== "rand" then
803 var res
= recvval
.rand
804 return v
.int_instance
(res
)
805 else if pname
== "bin_and" then
806 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
807 else if pname
== "bin_or" then
808 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
809 else if pname
== "bin_xor" then
810 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
811 else if pname
== "bin_not" then
812 return v
.int_instance
(args
[0].to_i
.bin_not
)
813 else if pname
== "native_int_to_s" then
814 return v
.native_string_instance
(recvval
.to_s
)
815 else if pname
== "strerror_ext" then
816 return v
.native_string_instance
(recvval
.strerror
)
818 else if cname
== "Char" then
819 var recv
= args
[0].val
.as(Char)
820 if pname
== "ascii" then
821 return v
.int_instance
(recv
.ascii
)
822 else if pname
== "successor" then
823 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
824 else if pname
== "predecessor" then
825 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
826 else if pname
== "<" then
827 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
828 else if pname
== ">" then
829 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
830 else if pname
== "<=" then
831 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
832 else if pname
== ">=" then
833 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
834 else if pname
== "<=>" then
835 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
837 else if cname
== "Float" then
838 var recv
= args
[0].to_f
839 if pname
== "unary -" then
840 return v
.float_instance
(-recv
)
841 else if pname
== "+" then
842 return v
.float_instance
(recv
+ args
[1].to_f
)
843 else if pname
== "-" then
844 return v
.float_instance
(recv
- args
[1].to_f
)
845 else if pname
== "*" then
846 return v
.float_instance
(recv
* args
[1].to_f
)
847 else if pname
== "/" then
848 return v
.float_instance
(recv
/ args
[1].to_f
)
849 else if pname
== "<" then
850 return v
.bool_instance
(recv
< args
[1].to_f
)
851 else if pname
== ">" then
852 return v
.bool_instance
(recv
> args
[1].to_f
)
853 else if pname
== "<=" then
854 return v
.bool_instance
(recv
<= args
[1].to_f
)
855 else if pname
== ">=" then
856 return v
.bool_instance
(recv
>= args
[1].to_f
)
857 else if pname
== "to_i" then
858 return v
.int_instance
(recv
.to_i
)
859 else if pname
== "cos" then
860 return v
.float_instance
(args
[0].to_f
.cos
)
861 else if pname
== "sin" then
862 return v
.float_instance
(args
[0].to_f
.sin
)
863 else if pname
== "tan" then
864 return v
.float_instance
(args
[0].to_f
.tan
)
865 else if pname
== "acos" then
866 return v
.float_instance
(args
[0].to_f
.acos
)
867 else if pname
== "asin" then
868 return v
.float_instance
(args
[0].to_f
.asin
)
869 else if pname
== "atan" then
870 return v
.float_instance
(args
[0].to_f
.atan
)
871 else if pname
== "sqrt" then
872 return v
.float_instance
(args
[0].to_f
.sqrt
)
873 else if pname
== "exp" then
874 return v
.float_instance
(args
[0].to_f
.exp
)
875 else if pname
== "log" then
876 return v
.float_instance
(args
[0].to_f
.log
)
877 else if pname
== "pow" then
878 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
879 else if pname
== "rand" then
880 return v
.float_instance
(args
[0].to_f
.rand
)
881 else if pname
== "abs" then
882 return v
.float_instance
(args
[0].to_f
.abs
)
883 else if pname
== "hypot_with" then
884 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
885 else if pname
== "is_nan" then
886 return v
.bool_instance
(args
[0].to_f
.is_nan
)
887 else if pname
== "is_inf_extern" then
888 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
890 else if cname
== "NativeString" then
891 if pname
== "init" then
892 return v
.native_string_instance
("!" * args
[1].to_i
)
894 var recvval
= args
.first
.val
.as(Buffer)
895 if pname
== "[]" then
896 var arg1
= args
[1].to_i
897 if arg1
>= recvval
.length
or arg1
< 0 then
898 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
900 return v
.char_instance
(recvval
.chars
[arg1
])
901 else if pname
== "[]=" then
902 var arg1
= args
[1].to_i
903 if arg1
>= recvval
.length
or arg1
< 0 then
904 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
906 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
908 else if pname
== "copy_to" then
909 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
910 var destval
= args
[1].val
.as(FlatBuffer)
911 var lenval
= args
[2].to_i
912 var fromval
= args
[3].to_i
913 var toval
= args
[4].to_i
915 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
917 if fromval
+ lenval
>= recvval
.length
then
918 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
921 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
923 if toval
+ lenval
>= destval
.length
then
924 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
926 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
928 else if pname
== "atoi" then
929 return v
.int_instance
(recvval
.to_i
)
930 else if pname
== "file_exists" then
931 return v
.bool_instance
(recvval
.to_s
.file_exists
)
932 else if pname
== "file_mkdir" then
935 else if pname
== "file_chdir" then
938 else if pname
== "file_realpath" then
939 return v
.native_string_instance
(recvval
.to_s
.realpath
)
940 else if pname
== "get_environ" then
941 var txt
= recvval
.to_s
.environ
942 return v
.native_string_instance
(txt
)
943 else if pname
== "system" then
944 var res
= sys
.system
(recvval
.to_s
)
945 return v
.int_instance
(res
)
946 else if pname
== "atof" then
947 return v
.float_instance
(recvval
.to_f
)
949 else if pname
== "calloc_string" then
950 return v
.native_string_instance
("!" * args
[1].to_i
)
951 else if cname
== "NativeArray" then
952 if pname
== "init" then
953 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
954 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
956 var recvval
= args
.first
.val
.as(Array[Instance])
957 if pname
== "[]" then
958 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
959 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
961 return recvval
[args
[1].to_i
]
962 else if pname
== "[]=" then
963 recvval
[args
[1].to_i
] = args
[2]
965 else if pname
== "length" then
966 return v
.int_instance
(recvval
.length
)
967 else if pname
== "copy_to" then
968 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
971 else if cname
== "NativeFile" then
972 if pname
== "native_stdout" then
973 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
974 else if pname
== "native_stdin" then
975 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
976 else if pname
== "native_stderr" then
977 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
978 else if pname
== "io_open_read" then
979 var a1
= args
[1].val
.as(Buffer)
980 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
981 else if pname
== "io_open_write" then
982 var a1
= args
[1].val
.as(Buffer)
983 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
985 var recvval
= args
.first
.val
986 if pname
== "io_write" then
987 var a1
= args
[1].val
.as(Buffer)
988 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
990 else if pname
== "io_read" then
991 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
992 var a1
= args
[1].val
.as(Buffer)
993 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
994 return v
.int_instance
(str
.length
)
995 else if pname
== "io_close" then
996 recvval
.as(IOS).close
997 return v
.int_instance
(0)
998 else if pname
== "address_is_null" then
999 return v
.false_instance
1001 else if pname
== "calloc_array" then
1002 var recvtype
= args
.first
.mtype
.as(MClassType)
1004 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
1005 mtype
= mtype
.arguments
.first
1006 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1007 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1008 else if pname
== "native_argc" then
1009 return v
.int_instance
(v
.arguments
.length
)
1010 else if pname
== "native_argv" then
1011 var txt
= v
.arguments
[args
[1].to_i
]
1012 return v
.native_string_instance
(txt
)
1013 else if pname
== "native_argc" then
1014 return v
.int_instance
(v
.arguments
.length
)
1015 else if pname
== "native_argv" then
1016 var txt
= v
.arguments
[args
[1].to_i
]
1017 return v
.native_string_instance
(txt
)
1018 else if pname
== "get_time" then
1019 return v
.int_instance
(get_time
)
1020 else if pname
== "srand_from" then
1021 srand_from
(args
[1].to_i
)
1023 else if pname
== "atan2" then
1024 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1025 else if pname
== "pi" then
1026 return v
.float_instance
(pi
)
1027 else if pname
== "lexer_goto" then
1028 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1029 else if pname
== "lexer_accept" then
1030 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1031 else if pname
== "parser_goto" then
1032 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1033 else if pname
== "parser_action" then
1034 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1035 else if pname
== "file_getcwd" then
1036 return v
.native_string_instance
(getcwd
)
1037 else if pname
== "errno" then
1038 return v
.int_instance
(sys
.errno
)
1039 else if pname
== "address_is_null" then
1040 return v
.false_instance
1042 return v
.error_instance
1046 redef class AbstractArray[E
]
1047 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1049 self.copy_to
(start
, len
, dest
, new_start
)
1053 redef class AAttrPropdef
1054 redef fun call
(v
, mpropdef
, args
)
1056 var recv
= args
.first
1057 assert recv
isa MutableInstance
1058 var attr
= self.mpropdef
.mproperty
1059 if mpropdef
== mreadpropdef
then
1060 assert args
.length
== 1
1061 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1062 return evaluate_expr
(v
, recv
)
1063 else if mpropdef
== mwritepropdef
then
1064 assert args
.length
== 2
1065 v
.write_attribute
(attr
, recv
, args
[1])
1072 # Evaluate and set the default value of the attribute in `recv`
1073 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1075 if is_lazy
then return
1076 var nexpr
= self.n_expr
1077 if nexpr
!= null then
1078 evaluate_expr
(v
, recv
)
1081 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1082 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1083 if mtype
isa MNullableType then
1084 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1088 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1090 assert recv
isa MutableInstance
1091 var nexpr
= self.n_expr
1092 assert nexpr
!= null
1093 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1095 var val
= v
.expr
(nexpr
)
1098 assert not v
.is_escaping
1099 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1104 redef class AClassdef
1105 # Execute an implicit `mpropdef` associated with the current node.
1106 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1108 if mpropdef
.mproperty
.is_root_init
then
1109 assert args
.length
== 1
1110 if not mpropdef
.is_intro
then
1111 # standard call-next-method
1112 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1113 v
.call_without_varargs
(superpd
, args
)
1123 # Evaluate the node as a possible expression.
1124 # Return a possible value
1125 # NOTE: Do not call this method directly, but use `v.expr`
1126 # This method is here to be implemented by subclasses.
1127 private fun expr
(v
: NaiveInterpreter): nullable Instance
1129 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1133 # Evaluate the node as a statement.
1134 # NOTE: Do not call this method directly, but use `v.stmt`
1135 # This method is here to be implemented by subclasses (no need to return something).
1136 private fun stmt
(v
: NaiveInterpreter)
1143 redef class ABlockExpr
1146 var last
= self.n_expr
.last
1147 for e
in self.n_expr
do
1148 if e
== last
then break
1150 if v
.is_escaping
then return null
1157 for e
in self.n_expr
do
1159 if v
.is_escaping
then return
1164 redef class AVardeclExpr
1167 var ne
= self.n_expr
1170 if i
== null then return
1171 v
.write_variable
(self.variable
.as(not null), i
)
1176 redef class AVarExpr
1179 return v
.read_variable
(self.variable
.as(not null))
1183 redef class AVarAssignExpr
1186 var i
= v
.expr
(self.n_value
)
1187 if i
== null then return null
1188 v
.write_variable
(self.variable
.as(not null), i
)
1193 redef class AVarReassignExpr
1196 var variable
= self.variable
.as(not null)
1197 var vari
= v
.read_variable
(variable
)
1198 var value
= v
.expr
(self.n_value
)
1199 if value
== null then return
1200 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1202 v
.write_variable
(variable
, res
)
1206 redef class ASelfExpr
1209 return v
.frame
.arguments
.first
1213 redef class AContinueExpr
1216 var ne
= self.n_expr
1219 if i
== null then return
1222 v
.continuemark
= self.escapemark
1226 redef class ABreakExpr
1229 var ne
= self.n_expr
1232 if i
== null then return
1235 v
.breakmark
= self.escapemark
1239 redef class AReturnExpr
1242 var ne
= self.n_expr
1245 if i
== null then return
1248 v
.returnmark
= v
.frame
1252 redef class AAbortExpr
1263 var cond
= v
.expr
(self.n_expr
)
1264 if cond
== null then return null
1265 if cond
.is_true
then
1266 return v
.expr
(self.n_then
.as(not null))
1268 return v
.expr
(self.n_else
.as(not null))
1274 var cond
= v
.expr
(self.n_expr
)
1275 if cond
== null then return
1276 if cond
.is_true
then
1284 redef class AIfexprExpr
1287 var cond
= v
.expr
(self.n_expr
)
1288 if cond
== null then return null
1289 if cond
.is_true
then
1290 return v
.expr
(self.n_then
)
1292 return v
.expr
(self.n_else
)
1300 v
.stmt
(self.n_block
)
1301 v
.is_break
(self.escapemark
) # Clear the break (if any)
1305 redef class AWhileExpr
1309 var cond
= v
.expr
(self.n_expr
)
1310 if cond
== null then return
1311 if not cond
.is_true
then return
1312 v
.stmt
(self.n_block
)
1313 if v
.is_break
(self.escapemark
) then return
1314 v
.is_continue
(self.escapemark
) # Clear the break
1315 if v
.is_escaping
then return
1320 redef class ALoopExpr
1324 v
.stmt
(self.n_block
)
1325 if v
.is_break
(self.escapemark
) then return
1326 v
.is_continue
(self.escapemark
) # Clear the break
1327 if v
.is_escaping
then return
1332 redef class AForExpr
1335 var col
= v
.expr
(self.n_expr
)
1336 if col
== null then return
1337 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1339 #self.debug("col {col}")
1340 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1341 #self.debug("iter {iter}")
1343 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1344 if not isok
.is_true
then return
1345 if self.variables
.length
== 1 then
1346 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1347 #self.debug("item {item}")
1348 v
.write_variable
(self.variables
.first
, item
)
1349 else if self.variables
.length
== 2 then
1350 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1351 v
.write_variable
(self.variables
[0], key
)
1352 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1353 v
.write_variable
(self.variables
[1], item
)
1357 v
.stmt
(self.n_block
)
1358 if v
.is_break
(self.escapemark
) then return
1359 v
.is_continue
(self.escapemark
) # Clear the break
1360 if v
.is_escaping
then return
1361 v
.callsite
(method_next
, [iter
])
1366 redef class AAssertExpr
1369 var cond
= v
.expr
(self.n_expr
)
1370 if cond
== null then return
1371 if not cond
.is_true
then
1373 if v
.is_escaping
then return
1376 fatal
(v
, "Assert '{nid.text}' failed")
1378 fatal
(v
, "Assert failed")
1388 var cond
= v
.expr
(self.n_expr
)
1389 if cond
== null then return null
1390 if cond
.is_true
then return cond
1391 return v
.expr
(self.n_expr2
)
1395 redef class AImpliesExpr
1398 var cond
= v
.expr
(self.n_expr
)
1399 if cond
== null then return null
1400 if not cond
.is_true
then return v
.true_instance
1401 return v
.expr
(self.n_expr2
)
1405 redef class AAndExpr
1408 var cond
= v
.expr
(self.n_expr
)
1409 if cond
== null then return null
1410 if not cond
.is_true
then return cond
1411 return v
.expr
(self.n_expr2
)
1415 redef class ANotExpr
1418 var cond
= v
.expr
(self.n_expr
)
1419 if cond
== null then return null
1420 return v
.bool_instance
(not cond
.is_true
)
1424 redef class AOrElseExpr
1427 var i
= v
.expr
(self.n_expr
)
1428 if i
== null then return null
1429 if i
!= v
.null_instance
then return i
1430 return v
.expr
(self.n_expr2
)
1434 redef class AIntExpr
1437 return v
.int_instance
(self.value
.as(not null))
1441 redef class AFloatExpr
1444 return v
.float_instance
(self.value
.as(not null))
1448 redef class ACharExpr
1451 return v
.char_instance
(self.value
.as(not null))
1455 redef class AArrayExpr
1458 var val
= new Array[Instance]
1459 for nexpr
in self.n_exprs
.n_exprs
do
1460 var i
= v
.expr
(nexpr
)
1461 if i
== null then return null
1464 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1465 var elttype
= mtype
.arguments
.first
1466 return v
.array_instance
(val
, elttype
)
1470 redef class AStringFormExpr
1473 var txt
= self.value
.as(not null)
1474 return v
.string_instance
(txt
)
1478 redef class ASuperstringExpr
1481 var array
= new Array[Instance]
1482 for nexpr
in n_exprs
do
1483 var i
= v
.expr
(nexpr
)
1484 if i
== null then return null
1487 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1488 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1494 redef class ACrangeExpr
1497 var e1
= v
.expr
(self.n_expr
)
1498 if e1
== null then return null
1499 var e2
= v
.expr
(self.n_expr2
)
1500 if e2
== null then return null
1501 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1502 var res
= new MutableInstance(mtype
)
1503 v
.init_instance
(res
)
1504 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1509 redef class AOrangeExpr
1512 var e1
= v
.expr
(self.n_expr
)
1513 if e1
== null then return null
1514 var e2
= v
.expr
(self.n_expr2
)
1515 if e2
== null then return null
1516 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1517 var res
= new MutableInstance(mtype
)
1518 v
.init_instance
(res
)
1519 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1524 redef class ATrueExpr
1527 return v
.bool_instance
(true)
1531 redef class AFalseExpr
1534 return v
.bool_instance
(false)
1538 redef class ANullExpr
1541 return v
.null_instance
1545 redef class AIsaExpr
1548 var i
= v
.expr
(self.n_expr
)
1549 if i
== null then return null
1550 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1551 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1555 redef class AAsCastExpr
1558 var i
= v
.expr
(self.n_expr
)
1559 if i
== null then return null
1560 var mtype
= self.mtype
.as(not null)
1561 var amtype
= v
.unanchor_type
(mtype
)
1562 if not v
.is_subtype
(i
.mtype
, amtype
) then
1563 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1569 redef class AAsNotnullExpr
1572 var i
= v
.expr
(self.n_expr
)
1573 if i
== null then return null
1574 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1575 if i
.mtype
isa MNullType then
1576 fatal
(v
, "Cast failed")
1582 redef class AParExpr
1585 return v
.expr
(self.n_expr
)
1589 redef class AOnceExpr
1592 if v
.onces
.has_key
(self) then
1593 return v
.onces
[self]
1595 var res
= v
.expr
(self.n_expr
)
1596 if res
== null then return null
1603 redef class ASendExpr
1606 var recv
= v
.expr
(self.n_expr
)
1607 if recv
== null then return null
1609 for a
in self.raw_arguments
do
1611 if i
== null then return null
1615 var res
= v
.callsite
(callsite
, args
)
1620 redef class ASendReassignFormExpr
1623 var recv
= v
.expr
(self.n_expr
)
1624 if recv
== null then return
1626 for a
in self.raw_arguments
do
1628 if i
== null then return
1631 var value
= v
.expr
(self.n_value
)
1632 if value
== null then return
1634 var read
= v
.callsite
(callsite
, args
)
1637 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1638 assert write
!= null
1642 v
.callsite
(write_callsite
, args
)
1646 redef class ASuperExpr
1649 var recv
= v
.frame
.arguments
.first
1651 for a
in self.n_args
.n_exprs
do
1653 if i
== null then return null
1657 var callsite
= self.callsite
1658 if callsite
!= null then
1659 # Add additionnals arguments for the super init call
1660 if args
.length
== 1 then
1661 for i
in [0..callsite
.msignature
.arity
[ do
1662 args
.add
(v
.frame
.arguments
[i
+1])
1666 var res
= v
.callsite
(callsite
, args
)
1670 if args
.length
== 1 then
1671 args
= v
.frame
.arguments
1674 # stantard call-next-method
1675 var mpropdef
= self.mpropdef
1676 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1677 var res
= v
.call_without_varargs
(mpropdef
, args
)
1682 redef class ANewExpr
1685 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1686 var recv
: Instance = new MutableInstance(mtype
)
1687 v
.init_instance
(recv
)
1689 for a
in self.n_args
.n_exprs
do
1691 if i
== null then return null
1694 var res2
= v
.callsite
(callsite
, args
)
1695 if res2
!= null then
1696 #self.debug("got {res2} from {mproperty}. drop {recv}")
1703 redef class AAttrExpr
1706 var recv
= v
.expr
(self.n_expr
)
1707 if recv
== null then return null
1708 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1709 var mproperty
= self.mproperty
.as(not null)
1710 return v
.read_attribute
(mproperty
, recv
)
1714 redef class AAttrAssignExpr
1717 var recv
= v
.expr
(self.n_expr
)
1718 if recv
== null then return
1719 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1720 var i
= v
.expr
(self.n_value
)
1721 if i
== null then return
1722 var mproperty
= self.mproperty
.as(not null)
1723 v
.write_attribute
(mproperty
, recv
, i
)
1727 redef class AAttrReassignExpr
1730 var recv
= v
.expr
(self.n_expr
)
1731 if recv
== null then return
1732 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1733 var value
= v
.expr
(self.n_value
)
1734 if value
== null then return
1735 var mproperty
= self.mproperty
.as(not null)
1736 var attr
= v
.read_attribute
(mproperty
, recv
)
1737 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1739 v
.write_attribute
(mproperty
, recv
, res
)
1743 redef class AIssetAttrExpr
1746 var recv
= v
.expr
(self.n_expr
)
1747 if recv
== null then return null
1748 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1749 var mproperty
= self.mproperty
.as(not null)
1750 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1754 redef class ADebugTypeExpr