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
72 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
74 self.modelbuilder
= modelbuilder
75 self.mainmodule
= mainmodule
76 self.arguments
= arguments
77 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
78 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
79 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
82 # Starts the interpreter on the main module of a program
83 fun start
(mainmodule
: MModule) do
84 var interpreter
= self
85 var sys_type
= mainmodule
.sys_type
86 if sys_type
== null then return # no class Sys
87 var mainobj
= new MutableInstance(sys_type
)
88 interpreter
.mainobj
= mainobj
89 interpreter
.init_instance
(mainobj
)
90 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
91 if initprop
!= null then
92 interpreter
.send
(initprop
, [mainobj
])
94 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
95 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
96 if mainprop
!= null then
97 interpreter
.send
(mainprop
, [mainobj
])
101 # Subtype test in the context of the mainmodule
102 fun is_subtype
(sub
, sup
: MType): Bool
104 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
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 executed?
118 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
119 var breakmark
: nullable EscapeMark = null
121 # Is a continue executed?
122 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
123 var continuemark
: nullable EscapeMark = null
125 # Is a return or a break or a continue executed?
126 # Use this function to know if you must skip the evaluation of statements
127 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
129 # The value associated with the current return/break/continue, if any.
130 # Set the value when you set a escapemark.
131 # Read the value when you catch a mark or reach the end of a method
132 var escapevalue
: nullable Instance = null
134 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
135 # If there is no break or if `escapemark` is null then return false.
136 # Use this function to catch a potential break.
137 fun is_break
(escapemark
: nullable EscapeMark): Bool
139 if escapemark
!= null and self.breakmark
== escapemark
then
140 self.breakmark
= null
147 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
148 # If there is no continue or if `escapemark` is null then return false.
149 # Use this function to catch a potential continue.
150 fun is_continue
(escapemark
: nullable EscapeMark): Bool
152 if escapemark
!= null and self.continuemark
== escapemark
then
153 self.continuemark
= null
160 # Evaluate `n` as an expression in the current context.
161 # Return the value of the expression.
162 # If `n` cannot be evaluated, then aborts.
163 fun expr
(n
: AExpr): nullable Instance
165 var frame
= self.frame
166 var old
= frame
.current_node
167 frame
.current_node
= n
168 #n.debug("IN Execute expr")
170 if i
== null and not self.is_escaping
then
171 n
.debug
("inconsitance: no value and not escaping.")
173 var implicit_cast_to
= n
.implicit_cast_to
174 if implicit_cast_to
!= null then
175 var mtype
= self.unanchor_type
(implicit_cast_to
)
176 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
179 #n.debug("OUT Execute expr: value is {i}")
180 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
181 frame
.current_node
= old
185 # Evaluate `n` as a statement in the current context.
186 # Do nothing if `n` is null.
187 # If `n` cannot be evaluated, then aborts.
188 fun stmt
(n
: nullable AExpr)
191 var frame
= self.frame
192 var old
= frame
.current_node
193 frame
.current_node
= n
194 #n.debug("Execute stmt")
196 frame
.current_node
= old
200 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
201 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
203 # Return the boolean instance associated with `val`.
204 fun bool_instance
(val
: Bool): Instance
206 if val
then return self.true_instance
else return self.false_instance
209 # Return the integer instance associated with `val`.
210 fun int_instance
(val
: Int): Instance
212 var ic
= self.mainmodule
.get_primitive_class
("Int")
213 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
216 # Return the char instance associated with `val`.
217 fun char_instance
(val
: Char): Instance
219 var ic
= self.mainmodule
.get_primitive_class
("Char")
220 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
223 # Return the float instance associated with `val`.
224 fun float_instance
(val
: Float): Instance
226 var ic
= self.mainmodule
.get_primitive_class
("Float")
227 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
230 # The unique instance of the `true` value.
231 var true_instance
: Instance
233 # The unique instance of the `false` value.
234 var false_instance
: Instance
236 # The unique instance of the `null` value.
237 var null_instance
: Instance
239 # Return a new array made of `values`.
240 # The dynamic type of the result is Array[elttype].
241 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
243 assert not elttype
.need_anchor
244 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
245 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
246 var res
= new MutableInstance(mtype
)
247 self.init_instance
(res
)
248 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
252 fun value_instance
(object
: Object): Instance
254 if object
isa Int then
255 return int_instance
(object
)
256 else if object
isa Bool then
257 return bool_instance
(object
)
258 else if object
isa String then
259 return string_instance
(object
)
265 # Return a new native string initialized with `txt`
266 fun native_string_instance
(txt
: String): Instance
268 var val
= new FlatBuffer.from
(txt
)
270 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
271 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
274 # Return a new String instance for `txt`
275 fun string_instance
(txt
: String): Instance
277 var nat
= native_string_instance
(txt
)
278 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
283 # The current frame used to store local variables of the current method executed
284 fun frame
: Frame do return frames
.first
286 # The stack of all frames. The first one is the current one.
287 var frames
= new List[Frame]
289 # Return a stack trace. One line per function
290 fun stack_trace
: String
292 var b
= new FlatBuffer
293 b
.append
(",---- Stack trace -- - - -\n")
295 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
297 b
.append
("`------------------- - - -")
301 # Exit the program with a message
302 fun fatal
(message
: String)
304 if frames
.is_empty
then
307 self.frame
.current_node
.fatal
(self, message
)
312 # Debug on the current node
313 fun debug
(message
: String)
315 if frames
.is_empty
then
318 self.frame
.current_node
.debug
(message
)
322 # Retrieve the value of the variable in the current frame
323 fun read_variable
(v
: Variable): Instance
329 # Assign the value of the variable in the current frame
330 fun write_variable
(v
: Variable, value
: Instance)
336 # Store known methods, used to trace methods as they are reached
337 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
339 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
340 # This method is used to manage varargs in signatures and returns the real array
341 # of instances to use in the call.
342 # Return `null` if one of the evaluation of the arguments return null.
343 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
345 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
346 var res
= new Array[Instance]
349 if args
.is_empty
then return res
351 var vararg_rank
= msignature
.vararg_rank
352 var vararg_len
= args
.length
- msignature
.arity
353 if vararg_len
< 0 then vararg_len
= 0
355 for i
in [0..msignature
.arity
[ do
356 if i
== vararg_rank
then
357 var vararg
= new Array[Instance]
358 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
359 var e
= self.expr
(args
[j
])
360 if e
== null then return null
363 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
364 res
.add
(self.array_instance
(vararg
, elttype
))
367 if i
> vararg_rank
then j
+= vararg_len
368 var e
= self.expr
(args
[j
])
369 if e
== null then return null
376 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
377 # Return a value if `mpropdef` is a function, or null if it is a procedure.
378 # The call is direct/static. There is no message-sending/late-binding.
379 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
381 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
382 self.discover_call_trace
.add mpropdef
383 self.debug
("Discovered {mpropdef}")
385 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
387 # Look for the AST node that implements the property
388 var mproperty
= mpropdef
.mproperty
389 var val
= mpropdef
.constant_value
390 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
391 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
392 self.parameter_check
(npropdef
, mpropdef
, args
)
393 return npropdef
.call
(self, mpropdef
, args
)
394 else if mproperty
.name
== "init" then
395 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
396 self.parameter_check
(nclassdef
, mpropdef
, args
)
397 return nclassdef
.call
(self, mpropdef
, args
)
398 else if val
!= null then
399 return value_instance
(val
)
401 fatal
("Fatal Error: method {mpropdef} not found in the AST")
406 # Generate type checks in the C code to check covariant parameters
407 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
409 var msignature
= mpropdef
.msignature
410 for i
in [0..msignature
.arity
[ do
411 # skip test for vararg since the array is instantiated with the correct polymorphic type
412 if msignature
.vararg_rank
== i
then continue
414 # skip if the cast is not required
415 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
416 if not origmtype
.need_anchor
then continue
418 # get the parameter type
419 var mtype
= msignature
.mparameters
[i
].mtype
420 var anchor
= args
.first
.mtype
.as(MClassType)
421 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
422 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
423 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
428 # Common code for runtime injected calls and normal calls
429 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
431 if mtype
isa MNullType then
432 if mproperty
.name
== "==" then
433 return self.bool_instance
(args
[0] == args
[1])
434 else if mproperty
.name
== "!=" then
435 return self.bool_instance
(args
[0] != args
[1])
437 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
438 fatal
("Receiver is null")
443 # Execute a full `callsite` for given `args`
444 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
445 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
447 var initializers
= callsite
.mpropdef
.initializers
448 if not initializers
.is_empty
then
449 var recv
= arguments
.first
451 for p
in initializers
do
452 if p
isa MMethod then
454 for x
in p
.intro
.msignature
.mparameters
do
455 args
.add arguments
[i
]
459 else if p
isa MAttribute then
460 assert recv
isa MutableInstance
461 recv
.attributes
[p
] = arguments
[i
]
465 assert i
== arguments
.length
467 return send
(callsite
.mproperty
, [recv
])
469 return send
(callsite
.mproperty
, arguments
)
472 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
473 # Return a value if `mproperty` is a function, or null if it is a procedure.
474 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
475 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
477 var recv
= args
.first
478 var mtype
= recv
.mtype
479 var ret
= send_commons
(mproperty
, args
, mtype
)
480 if ret
!= null then return ret
481 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
482 return self.call
(propdef
, args
)
485 # Read the attribute `mproperty` of an instance `recv` and return its value.
486 # If the attribute in not yet initialized, then aborts with an error message.
487 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
489 assert recv
isa MutableInstance
490 if not recv
.attributes
.has_key
(mproperty
) then
491 fatal
("Uninitialized attribute {mproperty.name}")
494 return recv
.attributes
[mproperty
]
497 # Replace in `recv` the value of the attribute `mproperty` by `value`
498 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
500 assert recv
isa MutableInstance
501 recv
.attributes
[mproperty
] = value
504 # Is the attribute `mproperty` initialized the instance `recv`?
505 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
507 assert recv
isa MutableInstance
508 return recv
.attributes
.has_key
(mproperty
)
511 # Collect attributes of a type in the order of their init
512 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
514 var cache
= self.collect_attr_propdef_cache
515 if cache
.has_key
(mtype
) then return cache
[mtype
]
517 var res
= new Array[AAttrPropdef]
518 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
519 self.mainmodule
.linearize_mclassdefs
(cds
)
521 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
522 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
523 for npropdef
in n
.n_propdefs
do
524 if npropdef
isa AAttrPropdef then
534 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
536 # Fill the initial values of the newly created instance `recv`.
537 # `recv.mtype` is used to know what must be filled.
538 fun init_instance
(recv
: Instance)
540 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
541 npropdef
.init_expr
(self, recv
)
545 # This function determine the correct type according the reciever of the current definition (self).
546 fun unanchor_type
(mtype
: MType): MType
548 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
551 # Placebo instance used to mark internal error result when `null` already have a meaning.
552 # TODO: replace with multiple return or something better
553 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
556 # An instance represents a value of the executed program.
557 abstract class Instance
558 # The dynamic type of the instance
559 # ASSERT: not self.mtype.is_anchored
562 # return true if the instance is the true value.
563 # return false if the instance is the true value.
565 fun is_true
: Bool do abort
567 # Return true if `self` IS `o` (using the Nit semantic of is)
568 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
570 # Human readable object identity "Type#number"
571 redef fun to_s
do return "{mtype}"
573 # Return the integer value if the instance is an integer.
575 fun to_i
: Int do abort
577 # Return the integer value if the instance is a float.
579 fun to_f
: Float do abort
581 # The real value encapsulated if the instance is primitive.
583 fun val
: Object do abort
586 # A instance with attribute (standards objects)
587 class MutableInstance
590 # The values of the attributes
591 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
594 # Special instance to handle primitives values (int, bool, etc.)
595 # The trick it just to encapsulate the <<real>> value
596 class PrimitiveInstance[E
: Object]
599 # The real value encapsulated
602 init(mtype
: MType, val
: E
)
610 if val
== true then return true
611 if val
== false then return false
617 if not o
isa PrimitiveInstance[Object] then return false
618 return self.val
== o
.val
623 if not o
isa PrimitiveInstance[Object] then return false
624 return self.val
.is_same_instance
(o
.val
)
627 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
629 redef fun to_i
do return val
.as(Int)
631 redef fun to_f
do return val
.as(Float)
634 # Information about local variables in a running method
636 # The current visited node
637 # The node is stored by frame to keep a stack trace
638 var current_node
: ANode
639 # The executed property.
640 # A Method in case of a call, an attribute in case of a default initialization.
641 var mpropdef
: MPropDef
642 # Arguments of the method (the first is the receiver)
643 var arguments
: Array[Instance]
644 # Mapping between a variable and the current value
645 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
649 # Aborts the program with a message
650 # `v` is used to know if a colored message is displayed or not
651 fun fatal
(v
: NaiveInterpreter, message
: String)
653 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
654 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
656 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
657 sys
.stderr
.write
(v
.stack_trace
)
658 sys
.stderr
.write
("\n")
665 # Execute a `mpropdef` associated with the current node.
666 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
668 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
673 redef class AMethPropdef
676 redef fun call
(v
, mpropdef
, args
)
678 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
679 var res
= call_commons
(v
, mpropdef
, args
, f
)
681 if v
.returnmark
== f
then
690 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
694 for i
in [0..mpropdef
.msignature
.arity
[ do
695 var variable
= self.n_signature
.n_params
[i
].variable
696 assert variable
!= null
697 v
.write_variable
(variable
, arguments
[i
+1])
700 if mpropdef
.is_abstract
then
701 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
705 # Call the implicit super-init
706 var auto_super_inits
= self.auto_super_inits
707 if auto_super_inits
!= null then
708 var args
= [arguments
.first
]
709 for auto_super_init
in auto_super_inits
do
711 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
712 args
.add
(arguments
[i
])
714 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
715 v
.callsite
(auto_super_init
, args
)
718 if auto_super_call
then
719 # standard call-next-method
720 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
721 v
.call
(superpd
, arguments
)
724 if mpropdef
.is_intern
or mpropdef
.is_extern
then
725 var res
= intern_call
(v
, mpropdef
, arguments
)
726 if res
!= v
.error_instance
then return res
729 if n_block
!= null then
734 if mpropdef
.is_intern
then
735 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
736 else if mpropdef
.is_extern
then
737 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
739 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
744 # Interprets a intern or a shortcut extern method.
745 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
746 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
748 var pname
= mpropdef
.mproperty
.name
749 var cname
= mpropdef
.mclassdef
.mclass
.name
750 if pname
== "output" then
751 var recv
= args
.first
754 else if pname
== "object_id" then
755 var recv
= args
.first
756 if recv
isa PrimitiveInstance[Object] then
757 return v
.int_instance
(recv
.val
.object_id
)
759 return v
.int_instance
(recv
.object_id
)
761 else if pname
== "output_class_name" then
762 var recv
= args
.first
765 else if pname
== "native_class_name" then
766 var recv
= args
.first
767 var txt
= recv
.mtype
.to_s
768 return v
.native_string_instance
(txt
)
769 else if pname
== "==" then
770 # == is correctly redefined for instances
771 return v
.bool_instance
(args
[0] == args
[1])
772 else if pname
== "!=" then
773 return v
.bool_instance
(args
[0] != args
[1])
774 else if pname
== "is_same_type" then
775 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
776 else if pname
== "is_same_instance" then
777 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
778 else if pname
== "exit" then
781 else if pname
== "sys" then
783 else if cname
== "Int" then
784 var recvval
= args
[0].to_i
785 if pname
== "unary -" then
786 return v
.int_instance
(-args
[0].to_i
)
787 else if pname
== "+" then
788 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
789 else if pname
== "-" then
790 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
791 else if pname
== "*" then
792 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
793 else if pname
== "%" then
794 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
795 else if pname
== "/" then
796 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
797 else if pname
== "<" then
798 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
799 else if pname
== ">" then
800 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
801 else if pname
== "<=" then
802 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
803 else if pname
== ">=" then
804 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
805 else if pname
== "<=>" then
806 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
807 else if pname
== "ascii" then
808 return v
.char_instance
(args
[0].to_i
.ascii
)
809 else if pname
== "to_f" then
810 return v
.float_instance
(args
[0].to_i
.to_f
)
811 else if pname
== "lshift" then
812 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
813 else if pname
== "rshift" then
814 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
815 else if pname
== "rand" then
816 var res
= recvval
.rand
817 return v
.int_instance
(res
)
818 else if pname
== "bin_and" then
819 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
820 else if pname
== "bin_or" then
821 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
822 else if pname
== "bin_xor" then
823 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
824 else if pname
== "bin_not" then
825 return v
.int_instance
(args
[0].to_i
.bin_not
)
826 else if pname
== "native_int_to_s" then
827 return v
.native_string_instance
(recvval
.to_s
)
828 else if pname
== "strerror_ext" then
829 return v
.native_string_instance
(recvval
.strerror
)
831 else if cname
== "Char" then
832 var recv
= args
[0].val
.as(Char)
833 if pname
== "ascii" then
834 return v
.int_instance
(recv
.ascii
)
835 else if pname
== "successor" then
836 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
837 else if pname
== "predecessor" then
838 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
839 else if pname
== "<" then
840 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
841 else if pname
== ">" then
842 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
843 else if pname
== "<=" then
844 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
845 else if pname
== ">=" then
846 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
847 else if pname
== "<=>" then
848 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
850 else if cname
== "Float" then
851 var recv
= args
[0].to_f
852 if pname
== "unary -" then
853 return v
.float_instance
(-recv
)
854 else if pname
== "+" then
855 return v
.float_instance
(recv
+ args
[1].to_f
)
856 else if pname
== "-" then
857 return v
.float_instance
(recv
- args
[1].to_f
)
858 else if pname
== "*" then
859 return v
.float_instance
(recv
* args
[1].to_f
)
860 else if pname
== "/" then
861 return v
.float_instance
(recv
/ args
[1].to_f
)
862 else if pname
== "<" then
863 return v
.bool_instance
(recv
< args
[1].to_f
)
864 else if pname
== ">" then
865 return v
.bool_instance
(recv
> args
[1].to_f
)
866 else if pname
== "<=" then
867 return v
.bool_instance
(recv
<= args
[1].to_f
)
868 else if pname
== ">=" then
869 return v
.bool_instance
(recv
>= args
[1].to_f
)
870 else if pname
== "to_i" then
871 return v
.int_instance
(recv
.to_i
)
872 else if pname
== "cos" then
873 return v
.float_instance
(args
[0].to_f
.cos
)
874 else if pname
== "sin" then
875 return v
.float_instance
(args
[0].to_f
.sin
)
876 else if pname
== "tan" then
877 return v
.float_instance
(args
[0].to_f
.tan
)
878 else if pname
== "acos" then
879 return v
.float_instance
(args
[0].to_f
.acos
)
880 else if pname
== "asin" then
881 return v
.float_instance
(args
[0].to_f
.asin
)
882 else if pname
== "atan" then
883 return v
.float_instance
(args
[0].to_f
.atan
)
884 else if pname
== "sqrt" then
885 return v
.float_instance
(args
[0].to_f
.sqrt
)
886 else if pname
== "exp" then
887 return v
.float_instance
(args
[0].to_f
.exp
)
888 else if pname
== "log" then
889 return v
.float_instance
(args
[0].to_f
.log
)
890 else if pname
== "pow" then
891 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
892 else if pname
== "rand" then
893 return v
.float_instance
(args
[0].to_f
.rand
)
894 else if pname
== "abs" then
895 return v
.float_instance
(args
[0].to_f
.abs
)
896 else if pname
== "hypot_with" then
897 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
898 else if pname
== "is_nan" then
899 return v
.bool_instance
(args
[0].to_f
.is_nan
)
900 else if pname
== "is_inf_extern" then
901 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
903 else if cname
== "NativeString" then
904 if pname
== "init" then
905 return v
.native_string_instance
("!" * args
[1].to_i
)
907 var recvval
= args
.first
.val
.as(Buffer)
908 if pname
== "[]" then
909 var arg1
= args
[1].to_i
910 if arg1
>= recvval
.length
or arg1
< 0 then
911 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
913 return v
.char_instance
(recvval
.chars
[arg1
])
914 else if pname
== "[]=" then
915 var arg1
= args
[1].to_i
916 if arg1
>= recvval
.length
or arg1
< 0 then
917 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
919 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
921 else if pname
== "copy_to" then
922 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
923 var destval
= args
[1].val
.as(FlatBuffer)
924 var lenval
= args
[2].to_i
925 var fromval
= args
[3].to_i
926 var toval
= args
[4].to_i
928 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
930 if fromval
+ lenval
>= recvval
.length
then
931 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
934 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
936 if toval
+ lenval
>= destval
.length
then
937 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
939 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
941 else if pname
== "atoi" then
942 return v
.int_instance
(recvval
.to_i
)
943 else if pname
== "file_exists" then
944 return v
.bool_instance
(recvval
.to_s
.file_exists
)
945 else if pname
== "file_mkdir" then
948 else if pname
== "file_chdir" then
951 else if pname
== "file_realpath" then
952 return v
.native_string_instance
(recvval
.to_s
.realpath
)
953 else if pname
== "get_environ" then
954 var txt
= recvval
.to_s
.environ
955 return v
.native_string_instance
(txt
)
956 else if pname
== "system" then
957 var res
= sys
.system
(recvval
.to_s
)
958 return v
.int_instance
(res
)
959 else if pname
== "atof" then
960 return v
.float_instance
(recvval
.to_f
)
962 else if pname
== "calloc_string" then
963 return v
.native_string_instance
("!" * args
[1].to_i
)
964 else if cname
== "NativeArray" then
965 if pname
== "init" then
966 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
967 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
969 var recvval
= args
.first
.val
.as(Array[Instance])
970 if pname
== "[]" then
971 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
972 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
974 return recvval
[args
[1].to_i
]
975 else if pname
== "[]=" then
976 recvval
[args
[1].to_i
] = args
[2]
978 else if pname
== "length" then
979 return v
.int_instance
(recvval
.length
)
980 else if pname
== "copy_to" then
981 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
984 else if cname
== "NativeFile" then
985 if pname
== "native_stdout" then
986 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
987 else if pname
== "native_stdin" then
988 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
989 else if pname
== "native_stderr" then
990 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
991 else if pname
== "io_open_read" then
992 var a1
= args
[1].val
.as(Buffer)
993 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
994 else if pname
== "io_open_write" then
995 var a1
= args
[1].val
.as(Buffer)
996 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
998 var recvval
= args
.first
.val
999 if pname
== "io_write" then
1000 var a1
= args
[1].val
.as(Buffer)
1001 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
1003 else if pname
== "io_read" then
1004 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
1005 var a1
= args
[1].val
.as(Buffer)
1006 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
1007 return v
.int_instance
(str
.length
)
1008 else if pname
== "io_close" then
1009 recvval
.as(IOS).close
1010 return v
.int_instance
(0)
1011 else if pname
== "address_is_null" then
1012 return v
.false_instance
1014 else if pname
== "calloc_array" then
1015 var recvtype
= args
.first
.mtype
.as(MClassType)
1017 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
1018 mtype
= mtype
.arguments
.first
1019 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1020 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1021 else if pname
== "native_argc" then
1022 return v
.int_instance
(v
.arguments
.length
)
1023 else if pname
== "native_argv" then
1024 var txt
= v
.arguments
[args
[1].to_i
]
1025 return v
.native_string_instance
(txt
)
1026 else if pname
== "native_argc" then
1027 return v
.int_instance
(v
.arguments
.length
)
1028 else if pname
== "native_argv" then
1029 var txt
= v
.arguments
[args
[1].to_i
]
1030 return v
.native_string_instance
(txt
)
1031 else if pname
== "get_time" then
1032 return v
.int_instance
(get_time
)
1033 else if pname
== "srand_from" then
1034 srand_from
(args
[1].to_i
)
1036 else if pname
== "atan2" then
1037 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1038 else if pname
== "pi" then
1039 return v
.float_instance
(pi
)
1040 else if pname
== "lexer_goto" then
1041 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1042 else if pname
== "lexer_accept" then
1043 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1044 else if pname
== "parser_goto" then
1045 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1046 else if pname
== "parser_action" then
1047 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1048 else if pname
== "file_getcwd" then
1049 return v
.native_string_instance
(getcwd
)
1050 else if pname
== "errno" then
1051 return v
.int_instance
(sys
.errno
)
1052 else if pname
== "address_is_null" then
1053 return v
.false_instance
1055 return v
.error_instance
1059 redef class AbstractArray[E
]
1060 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1062 self.copy_to
(start
, len
, dest
, new_start
)
1066 redef class AAttrPropdef
1067 redef fun call
(v
, mpropdef
, args
)
1069 var recv
= args
.first
1070 assert recv
isa MutableInstance
1071 var attr
= self.mpropdef
.mproperty
1072 if mpropdef
== mreadpropdef
then
1073 assert args
.length
== 1
1074 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1075 return evaluate_expr
(v
, recv
)
1076 else if mpropdef
== mwritepropdef
then
1077 assert args
.length
== 2
1078 v
.write_attribute
(attr
, recv
, args
[1])
1085 # Evaluate and set the default value of the attribute in `recv`
1086 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1088 if is_lazy
then return
1089 var nexpr
= self.n_expr
1090 if nexpr
!= null then
1091 evaluate_expr
(v
, recv
)
1094 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1095 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1096 if mtype
isa MNullableType then
1097 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1101 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1103 assert recv
isa MutableInstance
1104 var nexpr
= self.n_expr
1105 assert nexpr
!= null
1106 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1108 var val
= v
.expr
(nexpr
)
1111 assert not v
.is_escaping
1112 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1117 redef class AClassdef
1118 # Execute an implicit `mpropdef` associated with the current node.
1119 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1121 if mpropdef
.mproperty
.is_root_init
then
1122 assert args
.length
== 1
1123 if not mpropdef
.is_intro
then
1124 # standard call-next-method
1125 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1126 v
.call
(superpd
, args
)
1136 # Evaluate the node as a possible expression.
1137 # Return a possible value
1138 # NOTE: Do not call this method directly, but use `v.expr`
1139 # This method is here to be implemented by subclasses.
1140 private fun expr
(v
: NaiveInterpreter): nullable Instance
1142 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1146 # Evaluate the node as a statement.
1147 # NOTE: Do not call this method directly, but use `v.stmt`
1148 # This method is here to be implemented by subclasses (no need to return something).
1149 private fun stmt
(v
: NaiveInterpreter)
1156 redef class ABlockExpr
1159 var last
= self.n_expr
.last
1160 for e
in self.n_expr
do
1161 if e
== last
then break
1163 if v
.is_escaping
then return null
1170 for e
in self.n_expr
do
1172 if v
.is_escaping
then return
1177 redef class AVardeclExpr
1180 var ne
= self.n_expr
1183 if i
== null then return
1184 v
.write_variable
(self.variable
.as(not null), i
)
1189 redef class AVarExpr
1192 return v
.read_variable
(self.variable
.as(not null))
1196 redef class AVarAssignExpr
1199 var i
= v
.expr
(self.n_value
)
1200 if i
== null then return null
1201 v
.write_variable
(self.variable
.as(not null), i
)
1206 redef class AVarReassignExpr
1209 var variable
= self.variable
.as(not null)
1210 var vari
= v
.read_variable
(variable
)
1211 var value
= v
.expr
(self.n_value
)
1212 if value
== null then return
1213 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1215 v
.write_variable
(variable
, res
)
1219 redef class ASelfExpr
1222 return v
.frame
.arguments
.first
1226 redef class AContinueExpr
1229 var ne
= self.n_expr
1232 if i
== null then return
1235 v
.continuemark
= self.escapemark
1239 redef class ABreakExpr
1242 var ne
= self.n_expr
1245 if i
== null then return
1248 v
.breakmark
= self.escapemark
1252 redef class AReturnExpr
1255 var ne
= self.n_expr
1258 if i
== null then return
1261 v
.returnmark
= v
.frame
1265 redef class AAbortExpr
1276 var cond
= v
.expr
(self.n_expr
)
1277 if cond
== null then return null
1278 if cond
.is_true
then
1279 return v
.expr
(self.n_then
.as(not null))
1281 return v
.expr
(self.n_else
.as(not null))
1287 var cond
= v
.expr
(self.n_expr
)
1288 if cond
== null then return
1289 if cond
.is_true
then
1297 redef class AIfexprExpr
1300 var cond
= v
.expr
(self.n_expr
)
1301 if cond
== null then return null
1302 if cond
.is_true
then
1303 return v
.expr
(self.n_then
)
1305 return v
.expr
(self.n_else
)
1313 v
.stmt
(self.n_block
)
1314 v
.is_break
(self.escapemark
) # Clear the break (if any)
1318 redef class AWhileExpr
1322 var cond
= v
.expr
(self.n_expr
)
1323 if cond
== null then return
1324 if not cond
.is_true
then return
1325 v
.stmt
(self.n_block
)
1326 if v
.is_break
(self.escapemark
) then return
1327 v
.is_continue
(self.escapemark
) # Clear the break
1328 if v
.is_escaping
then return
1333 redef class ALoopExpr
1337 v
.stmt
(self.n_block
)
1338 if v
.is_break
(self.escapemark
) then return
1339 v
.is_continue
(self.escapemark
) # Clear the break
1340 if v
.is_escaping
then return
1345 redef class AForExpr
1348 var col
= v
.expr
(self.n_expr
)
1349 if col
== null then return
1350 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1352 #self.debug("col {col}")
1353 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1354 #self.debug("iter {iter}")
1356 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1357 if not isok
.is_true
then break
1358 if self.variables
.length
== 1 then
1359 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1360 #self.debug("item {item}")
1361 v
.write_variable
(self.variables
.first
, item
)
1362 else if self.variables
.length
== 2 then
1363 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1364 v
.write_variable
(self.variables
[0], key
)
1365 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1366 v
.write_variable
(self.variables
[1], item
)
1370 v
.stmt
(self.n_block
)
1371 if v
.is_break
(self.escapemark
) then break
1372 v
.is_continue
(self.escapemark
) # Clear the break
1373 if v
.is_escaping
then break
1374 v
.callsite
(method_next
, [iter
])
1376 var method_finish
= self.method_finish
1377 if method_finish
!= null then
1378 v
.callsite
(method_finish
, [iter
])
1383 redef class AAssertExpr
1386 var cond
= v
.expr
(self.n_expr
)
1387 if cond
== null then return
1388 if not cond
.is_true
then
1390 if v
.is_escaping
then return
1393 fatal
(v
, "Assert '{nid.text}' failed")
1395 fatal
(v
, "Assert failed")
1405 var cond
= v
.expr
(self.n_expr
)
1406 if cond
== null then return null
1407 if cond
.is_true
then return cond
1408 return v
.expr
(self.n_expr2
)
1412 redef class AImpliesExpr
1415 var cond
= v
.expr
(self.n_expr
)
1416 if cond
== null then return null
1417 if not cond
.is_true
then return v
.true_instance
1418 return v
.expr
(self.n_expr2
)
1422 redef class AAndExpr
1425 var cond
= v
.expr
(self.n_expr
)
1426 if cond
== null then return null
1427 if not cond
.is_true
then return cond
1428 return v
.expr
(self.n_expr2
)
1432 redef class ANotExpr
1435 var cond
= v
.expr
(self.n_expr
)
1436 if cond
== null then return null
1437 return v
.bool_instance
(not cond
.is_true
)
1441 redef class AOrElseExpr
1444 var i
= v
.expr
(self.n_expr
)
1445 if i
== null then return null
1446 if i
!= v
.null_instance
then return i
1447 return v
.expr
(self.n_expr2
)
1451 redef class AIntExpr
1454 return v
.int_instance
(self.value
.as(not null))
1458 redef class AFloatExpr
1461 return v
.float_instance
(self.value
.as(not null))
1465 redef class ACharExpr
1468 return v
.char_instance
(self.value
.as(not null))
1472 redef class AArrayExpr
1475 var val
= new Array[Instance]
1476 for nexpr
in self.n_exprs
.n_exprs
do
1477 var i
= v
.expr
(nexpr
)
1478 if i
== null then return null
1481 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1482 var elttype
= mtype
.arguments
.first
1483 return v
.array_instance
(val
, elttype
)
1487 redef class AStringFormExpr
1490 var txt
= self.value
.as(not null)
1491 return v
.string_instance
(txt
)
1495 redef class ASuperstringExpr
1498 var array
= new Array[Instance]
1499 for nexpr
in n_exprs
do
1500 var i
= v
.expr
(nexpr
)
1501 if i
== null then return null
1504 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1505 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1511 redef class ACrangeExpr
1514 var e1
= v
.expr
(self.n_expr
)
1515 if e1
== null then return null
1516 var e2
= v
.expr
(self.n_expr2
)
1517 if e2
== null then return null
1518 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1519 var res
= new MutableInstance(mtype
)
1520 v
.init_instance
(res
)
1521 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1526 redef class AOrangeExpr
1529 var e1
= v
.expr
(self.n_expr
)
1530 if e1
== null then return null
1531 var e2
= v
.expr
(self.n_expr2
)
1532 if e2
== null then return null
1533 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1534 var res
= new MutableInstance(mtype
)
1535 v
.init_instance
(res
)
1536 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1541 redef class ATrueExpr
1544 return v
.bool_instance
(true)
1548 redef class AFalseExpr
1551 return v
.bool_instance
(false)
1555 redef class ANullExpr
1558 return v
.null_instance
1562 redef class AIsaExpr
1565 var i
= v
.expr
(self.n_expr
)
1566 if i
== null then return null
1567 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1568 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1572 redef class AAsCastExpr
1575 var i
= v
.expr
(self.n_expr
)
1576 if i
== null then return null
1577 var mtype
= self.mtype
.as(not null)
1578 var amtype
= v
.unanchor_type
(mtype
)
1579 if not v
.is_subtype
(i
.mtype
, amtype
) then
1580 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1586 redef class AAsNotnullExpr
1589 var i
= v
.expr
(self.n_expr
)
1590 if i
== null then return null
1591 if i
.mtype
isa MNullType then
1592 fatal
(v
, "Cast failed")
1598 redef class AParExpr
1601 return v
.expr
(self.n_expr
)
1605 redef class AOnceExpr
1608 if v
.onces
.has_key
(self) then
1609 return v
.onces
[self]
1611 var res
= v
.expr
(self.n_expr
)
1612 if res
== null then return null
1619 redef class ASendExpr
1622 var recv
= v
.expr
(self.n_expr
)
1623 if recv
== null then return null
1624 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1625 if args
== null then return null
1627 var res
= v
.callsite
(callsite
, args
)
1632 redef class ASendReassignFormExpr
1635 var recv
= v
.expr
(self.n_expr
)
1636 if recv
== null then return
1637 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1638 if args
== null then return
1639 var value
= v
.expr
(self.n_value
)
1640 if value
== null then return
1642 var read
= v
.callsite
(callsite
, args
)
1645 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1646 assert write
!= null
1650 v
.callsite
(write_callsite
, args
)
1654 redef class ASuperExpr
1657 var recv
= v
.frame
.arguments
.first
1659 var callsite
= self.callsite
1660 if callsite
!= null then
1661 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1662 if args
== null then return null
1663 # Add additional arguments for the super init call
1664 if args
.length
== 1 then
1665 for i
in [0..callsite
.msignature
.arity
[ do
1666 args
.add
(v
.frame
.arguments
[i
+1])
1670 var res
= v
.callsite
(callsite
, args
)
1674 # standard call-next-method
1675 var mpropdef
= self.mpropdef
1676 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1678 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1679 if args
== null then return null
1681 if args
.length
== 1 then
1682 args
= v
.frame
.arguments
1684 var res
= v
.call
(mpropdef
, args
)
1689 redef class ANewExpr
1692 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1693 var recv
: Instance = new MutableInstance(mtype
)
1694 v
.init_instance
(recv
)
1695 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1696 if args
== null then return null
1697 var res2
= v
.callsite
(callsite
, args
)
1698 if res2
!= null then
1699 #self.debug("got {res2} from {mproperty}. drop {recv}")
1706 redef class AAttrExpr
1709 var recv
= v
.expr
(self.n_expr
)
1710 if recv
== null then return null
1711 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1712 var mproperty
= self.mproperty
.as(not null)
1713 return v
.read_attribute
(mproperty
, recv
)
1717 redef class AAttrAssignExpr
1720 var recv
= v
.expr
(self.n_expr
)
1721 if recv
== null then return
1722 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1723 var i
= v
.expr
(self.n_value
)
1724 if i
== null then return
1725 var mproperty
= self.mproperty
.as(not null)
1726 v
.write_attribute
(mproperty
, recv
, i
)
1730 redef class AAttrReassignExpr
1733 var recv
= v
.expr
(self.n_expr
)
1734 if recv
== null then return
1735 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1736 var value
= v
.expr
(self.n_value
)
1737 if value
== null then return
1738 var mproperty
= self.mproperty
.as(not null)
1739 var attr
= v
.read_attribute
(mproperty
, recv
)
1740 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1742 v
.write_attribute
(mproperty
, recv
, res
)
1746 redef class AIssetAttrExpr
1749 var recv
= v
.expr
(self.n_expr
)
1750 if recv
== null then return null
1751 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1752 var mproperty
= self.mproperty
.as(not null)
1753 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1757 redef class ADebugTypeExpr