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
23 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 init_naive_interpreter
(interpreter
, mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
55 private fun init_naive_interpreter
(interpreter
: NaiveInterpreter, mainmodule
: MModule) do
56 var sys_type
= mainmodule
.sys_type
57 if sys_type
== null then return # no class Sys
58 var mainobj
= new MutableInstance(sys_type
)
59 interpreter
.mainobj
= mainobj
60 interpreter
.init_instance
(mainobj
)
61 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
62 if initprop
!= null then
63 interpreter
.send
(initprop
, [mainobj
])
65 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
66 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
67 if mainprop
!= null then
68 interpreter
.send
(mainprop
, [mainobj
])
73 # The visitor that interprets the Nit Program by walking on the AST
74 private class NaiveInterpreter
75 # The modelbuilder that know the AST and its associations with the model
76 var modelbuilder
: ModelBuilder
78 # The main moduleof the program (used to lookup methoda
79 var mainmodule
: MModule
81 # The command line arguments of the interpreted program
82 # arguments.first is the program name
83 # arguments[1] is the first argument
84 var arguments
: Array[String]
86 var mainobj
: nullable Instance
88 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
90 self.modelbuilder
= modelbuilder
91 self.mainmodule
= mainmodule
92 self.arguments
= arguments
93 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
94 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
95 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
98 # Subtype test in the context of the mainmodule
99 fun is_subtype
(sub
, sup
: MType): Bool
101 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
104 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
106 assert recv
isa MClassType
107 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
110 # Is a return executed?
111 # Set this mark to skip the evaluation until the end of the specified method frame
112 var returnmark
: nullable Frame = null
114 # Is a break executed?
115 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
116 var breakmark
: nullable EscapeMark = null
118 # Is a continue executed?
119 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
120 var continuemark
: nullable EscapeMark = null
122 # Is a return or a break or a continue executed?
123 # Use this function to know if you must skip the evaluation of statements
124 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
126 # The value associated with the current return/break/continue, if any.
127 # Set the value when you set a escapemark.
128 # Read the value when you catch a mark or reach the end of a method
129 var escapevalue
: nullable Instance = null
131 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
132 # If there is no break or if `escapemark` is null then return false.
133 # Use this function to catch a potential break.
134 fun is_break
(escapemark
: nullable EscapeMark): Bool
136 if escapemark
!= null and self.breakmark
== escapemark
then
137 self.breakmark
= null
144 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
145 # If there is no continue or if `escapemark` is null then return false.
146 # Use this function to catch a potential continue.
147 fun is_continue
(escapemark
: nullable EscapeMark): Bool
149 if escapemark
!= null and self.continuemark
== escapemark
then
150 self.continuemark
= null
157 # Evaluate `n` as an expression in the current context.
158 # Return the value of the expression.
159 # If `n` cannot be evaluated, then aborts.
160 fun expr
(n
: AExpr): nullable Instance
162 var frame
= self.frame
163 var old
= frame
.current_node
164 frame
.current_node
= n
165 #n.debug("IN Execute expr")
167 if i
== null and not self.is_escaping
then
168 n
.debug
("inconsitance: no value and not escaping.")
170 var implicit_cast_to
= n
.implicit_cast_to
171 if implicit_cast_to
!= null then
172 var mtype
= self.unanchor_type
(implicit_cast_to
)
173 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
176 #n.debug("OUT Execute expr: value is {i}")
177 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
178 frame
.current_node
= old
182 # Evaluate `n` as a statement in the current context.
183 # Do nothing if `n` is null.
184 # If `n` cannot be evaluated, then aborts.
185 fun stmt
(n
: nullable AExpr)
188 var frame
= self.frame
189 var old
= frame
.current_node
190 frame
.current_node
= n
191 #n.debug("Execute stmt")
193 frame
.current_node
= old
197 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
198 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
200 # Return the boolean instance associated with `val`.
201 fun bool_instance
(val
: Bool): Instance
203 if val
then return self.true_instance
else return self.false_instance
206 # Return the integer instance associated with `val`.
207 fun int_instance
(val
: Int): Instance
209 var ic
= self.mainmodule
.get_primitive_class
("Int")
210 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
213 # Return the char instance associated with `val`.
214 fun char_instance
(val
: Char): Instance
216 var ic
= self.mainmodule
.get_primitive_class
("Char")
217 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
220 # Return the float instance associated with `val`.
221 fun float_instance
(val
: Float): Instance
223 var ic
= self.mainmodule
.get_primitive_class
("Float")
224 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
227 # The unique intance of the `true` value.
228 var true_instance
: Instance
230 # The unique intance of the `false` value.
231 var false_instance
: Instance
233 # The unique intance of the `null` value.
234 var null_instance
: Instance
236 # Return a new array made of `values`.
237 # The dynamic type of the result is Array[elttype].
238 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
240 assert not elttype
.need_anchor
241 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
242 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
243 var res
= new MutableInstance(mtype
)
244 self.init_instance
(res
)
245 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
249 # Return a new native string initialized with `txt`
250 fun native_string_instance
(txt
: String): Instance
252 var val
= new FlatBuffer.from
(txt
)
254 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
255 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
258 # The current frame used to store local variables of the current method executed
259 fun frame
: Frame do return frames
.first
261 # The stack of all frames. The first one is the current one.
262 var frames
: List[Frame] = new List[Frame]
264 # Return a stack stace. One line per function
265 fun stack_trace
: String
267 var b
= new FlatBuffer
268 b
.append
(",---- Stack trace -- - - -\n")
270 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
272 b
.append
("`------------------- - - -")
276 # Exit the program with a message
277 fun fatal
(message
: String)
279 if frames
.is_empty
then
282 self.frame
.current_node
.fatal
(self, message
)
287 # Debug on the current node
288 fun debug
(message
: String)
290 if frames
.is_empty
then
293 self.frame
.current_node
.debug
(message
)
297 # Store known method, used to trace methods as thez are reached
298 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
300 # Common code for calls to injected methods and normal methods
301 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
303 var vararg_rank
= mpropdef
.msignature
.vararg_rank
304 if vararg_rank
>= 0 then
305 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
307 args
= new Array[Instance]
309 args
.add
(rawargs
.first
) # recv
311 for i
in [0..vararg_rank
[ do
312 args
.add
(rawargs
[i
+1])
315 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
316 var vararg
= new Array[Instance]
317 for i
in [vararg_rank
..vararg_lastrank
] do
318 vararg
.add
(rawargs
[i
+1])
320 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
321 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
322 args
.add
(self.array_instance
(vararg
, elttype
))
324 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
325 args
.add
(rawargs
[i
+1])
331 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
332 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
333 # The call is direct/static. There is no message-seding/late-binding.
334 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
336 args
= call_commons
(mpropdef
, args
)
337 return call_without_varargs
(mpropdef
, args
)
340 # Common code to call and this function
342 # Call only executes the variadic part, this avoids
343 # double encapsulation of variadic parameters into an Array
344 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
346 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
347 self.discover_call_trace
.add mpropdef
348 self.debug
("Discovered {mpropdef}")
350 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
352 # Look for the AST node that implements the property
353 var mproperty
= mpropdef
.mproperty
354 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
355 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
356 self.parameter_check
(npropdef
, mpropdef
, args
)
357 return npropdef
.call
(self, mpropdef
, args
)
358 else if mproperty
.name
== "init" then
359 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
360 self.parameter_check
(nclassdef
, mpropdef
, args
)
361 return nclassdef
.call
(self, mpropdef
, args
)
363 fatal
("Fatal Error: method {mpropdef} not found in the AST")
368 # Generate type checks in the C code to check covariant parameters
369 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
371 var msignature
= mpropdef
.msignature
372 for i
in [0..msignature
.arity
[ do
373 # skip test for vararg since the array is instantiated with the correct polymorphic type
374 if msignature
.vararg_rank
== i
then continue
376 # skip if the cast is not required
377 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
378 if not origmtype
.need_anchor
then continue
380 # get the parameter type
381 var mtype
= msignature
.mparameters
[i
].mtype
382 var anchor
= args
.first
.mtype
.as(MClassType)
383 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
384 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
385 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
390 # Common code for runtime injected calls and normal calls
391 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
393 if mtype
isa MNullType then
394 if mproperty
.name
== "==" then
395 return self.bool_instance
(args
[0] == args
[1])
396 else if mproperty
.name
== "!=" then
397 return self.bool_instance
(args
[0] != args
[1])
399 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
400 fatal
("Receiver is null")
405 # Execute a full `callsite` for given `args`
406 # Use this method, instead of `send` to execute and control the aditionnal behavior of the call-sites
407 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
409 var initializers
= callsite
.mpropdef
.initializers
410 if not initializers
.is_empty
then
411 assert initializers
.length
== arguments
.length
- 1 else debug
("expected {initializers.length} got {arguments.length - 1}")
412 var recv
= arguments
.first
414 for p
in initializers
do
415 if p
isa MMethod then
416 self.send
(p
, [recv
, arguments
[i
]])
417 else if p
isa MAttribute then
418 assert recv
isa MutableInstance
419 recv
.attributes
[p
] = arguments
[i
]
423 return send
(callsite
.mproperty
, [recv
])
425 return send
(callsite
.mproperty
, arguments
)
428 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
429 # Return a falue if `mproperty` is a function, or null if it is a procedure.
430 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
431 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
433 var recv
= args
.first
434 var mtype
= recv
.mtype
435 var ret
= send_commons
(mproperty
, args
, mtype
)
436 if ret
!= null then return ret
437 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
438 return self.call
(propdef
, args
)
441 # Read the attribute `mproperty` of an instance `recv` and return its value.
442 # If the attribute in not yet initialized, then aborts with an error message.
443 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
445 assert recv
isa MutableInstance
446 if not recv
.attributes
.has_key
(mproperty
) then
447 fatal
("Uninitialized attribute {mproperty.name}")
450 return recv
.attributes
[mproperty
]
453 # Replace in `recv` the value of the attribute `mproperty` by `value`
454 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
456 assert recv
isa MutableInstance
457 recv
.attributes
[mproperty
] = value
460 # Is the attribute `mproperty` initialized the instance `recv`?
461 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
463 assert recv
isa MutableInstance
464 return recv
.attributes
.has_key
(mproperty
)
467 # Collect attributes of a type in the order of their init
468 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
470 var cache
= self.collect_attr_propdef_cache
471 if cache
.has_key
(mtype
) then return cache
[mtype
]
473 var res
= new Array[AAttrPropdef]
474 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
475 self.mainmodule
.linearize_mclassdefs
(cds
)
477 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
478 for npropdef
in n
.n_propdefs
do
479 if npropdef
isa AAttrPropdef then
489 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
491 # Fill the initial values of the newly created instance `recv`.
492 # `recv.mtype` is used to know what must be filled.
493 fun init_instance
(recv
: Instance)
495 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
496 npropdef
.init_expr
(self, recv
)
500 # This function determine the correct type according the reciever of the current definition (self).
501 fun unanchor_type
(mtype
: MType): MType
503 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
507 # An instance represents a value of the executed program.
508 abstract class Instance
509 # The dynamic type of the instance
510 # ASSERT: not self.mtype.is_anchored
513 # return true if the instance is the true value.
514 # return false if the instance is the true value.
516 fun is_true
: Bool do abort
518 # Return true if `self` IS `o` (using the Nit semantic of is)
519 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
521 # Human readable object identity "Type#number"
522 redef fun to_s
do return "{mtype}"
524 # Return the integer value if the instance is an integer.
526 fun to_i
: Int do abort
528 # Return the integer value if the instance is a float.
530 fun to_f
: Float do abort
532 # The real value encapsulated if the instance is primitive.
534 fun val
: Object do abort
537 # A instance with attribute (standards objects)
538 class MutableInstance
541 # The values of the attributes
542 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
545 # Special instance to handle primitives values (int, bool, etc.)
546 # The trick it just to encapsulate the <<real>> value
547 class PrimitiveInstance[E
: Object]
550 # The real value encapsulated
553 init(mtype
: MType, val
: E
)
561 if val
== true then return true
562 if val
== false then return false
568 if not o
isa PrimitiveInstance[Object] then return false
569 return self.val
== o
.val
574 if not o
isa PrimitiveInstance[Object] then return false
575 return self.val
.is_same_instance
(o
.val
)
578 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
580 redef fun to_i
do return val
.as(Int)
582 redef fun to_f
do return val
.as(Float)
585 # Information about local variables in a running method
587 # The current visited node
588 # The node is stored by frame to keep a stack trace
589 var current_node
: ANode
590 # The executed property.
591 # A Method in case of a call, an attribute in case of a default initialization.
592 var mpropdef
: MPropDef
593 # Arguments of the method (the first is te receiver
594 var arguments
: Array[Instance]
595 # Mapping betwen a variable an the current value
596 var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
600 # Aborts the program with a message
601 # `v` is used to know if a colored message is displayed or not
602 private fun fatal
(v
: NaiveInterpreter, message
: String)
604 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
605 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
607 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
608 sys
.stderr
.write
(v
.stack_trace
)
609 sys
.stderr
.write
("\n")
616 # Execute a `mpropdef` associated with the current node.
617 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
619 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
624 redef class AMethPropdef
627 redef fun call
(v
, mpropdef
, args
)
629 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
630 var res
= call_commons
(v
, mpropdef
, args
, f
)
632 if v
.returnmark
== f
then
641 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
643 for i
in [0..mpropdef
.msignature
.arity
[ do
644 var variable
= self.n_signature
.n_params
[i
].variable
645 assert variable
!= null
646 f
.map
[variable
] = arguments
[i
+1]
651 if mpropdef
.is_abstract
then
652 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
656 # Call the implicit super-init
657 var auto_super_inits
= self.auto_super_inits
658 if auto_super_inits
!= null then
659 var args
= [arguments
.first
]
660 for auto_super_init
in auto_super_inits
do
662 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
663 args
.add
(arguments
[i
])
665 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
666 v
.callsite
(auto_super_init
, args
)
669 if auto_super_call
then
670 # standard call-next-method
671 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
672 v
.call_without_varargs
(superpd
, arguments
)
675 if n_block
!= null then
679 return intern_call
(v
, mpropdef
, arguments
)
683 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
685 var pname
= mpropdef
.mproperty
.name
686 var cname
= mpropdef
.mclassdef
.mclass
.name
687 if pname
== "output" then
688 var recv
= args
.first
691 else if pname
== "object_id" then
692 var recv
= args
.first
693 if recv
isa PrimitiveInstance[Object] then
694 return v
.int_instance
(recv
.val
.object_id
)
696 return v
.int_instance
(recv
.object_id
)
698 else if pname
== "output_class_name" then
699 var recv
= args
.first
702 else if pname
== "native_class_name" then
703 var recv
= args
.first
704 var txt
= recv
.mtype
.to_s
705 return v
.native_string_instance
(txt
)
706 else if pname
== "==" then
707 # == is correclt redefined for instances
708 return v
.bool_instance
(args
[0] == args
[1])
709 else if pname
== "!=" then
710 return v
.bool_instance
(args
[0] != args
[1])
711 else if pname
== "is_same_type" then
712 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
713 else if pname
== "is_same_instance" then
714 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
715 else if pname
== "exit" then
718 else if pname
== "sys" then
720 else if cname
== "Int" then
721 var recvval
= args
[0].to_i
722 if pname
== "unary -" then
723 return v
.int_instance
(-args
[0].to_i
)
724 else if pname
== "+" then
725 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
726 else if pname
== "-" then
727 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
728 else if pname
== "*" then
729 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
730 else if pname
== "%" then
731 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
732 else if pname
== "/" then
733 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
734 else if pname
== "<" then
735 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
736 else if pname
== ">" then
737 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
738 else if pname
== "<=" then
739 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
740 else if pname
== ">=" then
741 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
742 else if pname
== "<=>" then
743 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
744 else if pname
== "ascii" then
745 return v
.char_instance
(args
[0].to_i
.ascii
)
746 else if pname
== "to_f" then
747 return v
.float_instance
(args
[0].to_i
.to_f
)
748 else if pname
== "lshift" then
749 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
750 else if pname
== "rshift" then
751 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
752 else if pname
== "rand" then
753 var res
= recvval
.rand
754 return v
.int_instance
(res
)
755 else if pname
== "bin_and" then
756 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
757 else if pname
== "bin_or" then
758 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
759 else if pname
== "bin_xor" then
760 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
761 else if pname
== "native_int_to_s" then
762 return v
.native_string_instance
(recvval
.to_s
)
763 else if pname
== "strerror_ext" then
764 return v
.native_string_instance
(recvval
.strerror
)
766 else if cname
== "Char" then
767 var recv
= args
[0].val
.as(Char)
768 if pname
== "ascii" then
769 return v
.int_instance
(recv
.ascii
)
770 else if pname
== "successor" then
771 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
772 else if pname
== "predecessor" then
773 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
774 else if pname
== "<" then
775 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
776 else if pname
== ">" then
777 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
778 else if pname
== "<=" then
779 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
780 else if pname
== ">=" then
781 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
782 else if pname
== "<=>" then
783 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
785 else if cname
== "Float" then
786 var recv
= args
[0].to_f
787 if pname
== "unary -" then
788 return v
.float_instance
(-recv
)
789 else if pname
== "+" then
790 return v
.float_instance
(recv
+ args
[1].to_f
)
791 else if pname
== "-" then
792 return v
.float_instance
(recv
- args
[1].to_f
)
793 else if pname
== "*" then
794 return v
.float_instance
(recv
* args
[1].to_f
)
795 else if pname
== "/" then
796 return v
.float_instance
(recv
/ args
[1].to_f
)
797 else if pname
== "<" then
798 return v
.bool_instance
(recv
< args
[1].to_f
)
799 else if pname
== ">" then
800 return v
.bool_instance
(recv
> args
[1].to_f
)
801 else if pname
== "<=" then
802 return v
.bool_instance
(recv
<= args
[1].to_f
)
803 else if pname
== ">=" then
804 return v
.bool_instance
(recv
>= args
[1].to_f
)
805 else if pname
== "to_i" then
806 return v
.int_instance
(recv
.to_i
)
807 else if pname
== "cos" then
808 return v
.float_instance
(args
[0].to_f
.cos
)
809 else if pname
== "sin" then
810 return v
.float_instance
(args
[0].to_f
.sin
)
811 else if pname
== "tan" then
812 return v
.float_instance
(args
[0].to_f
.tan
)
813 else if pname
== "acos" then
814 return v
.float_instance
(args
[0].to_f
.acos
)
815 else if pname
== "asin" then
816 return v
.float_instance
(args
[0].to_f
.asin
)
817 else if pname
== "atan" then
818 return v
.float_instance
(args
[0].to_f
.atan
)
819 else if pname
== "sqrt" then
820 return v
.float_instance
(args
[0].to_f
.sqrt
)
821 else if pname
== "exp" then
822 return v
.float_instance
(args
[0].to_f
.exp
)
823 else if pname
== "log" then
824 return v
.float_instance
(args
[0].to_f
.log
)
825 else if pname
== "pow" then
826 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
827 else if pname
== "rand" then
828 return v
.float_instance
(args
[0].to_f
.rand
)
829 else if pname
== "abs" then
830 return v
.float_instance
(args
[0].to_f
.abs
)
831 else if pname
== "hypot_with" then
832 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
833 else if pname
== "is_nan" then
834 return v
.bool_instance
(args
[0].to_f
.is_nan
)
835 else if pname
== "is_inf_extern" then
836 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
838 else if cname
== "NativeString" then
839 if pname
== "init" then
840 return v
.native_string_instance
("!" * args
[1].to_i
)
842 var recvval
= args
.first
.val
.as(Buffer)
843 if pname
== "[]" then
844 var arg1
= args
[1].to_i
845 if arg1
>= recvval
.length
or arg1
< 0 then
846 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
848 return v
.char_instance
(recvval
.chars
[arg1
])
849 else if pname
== "[]=" then
850 var arg1
= args
[1].to_i
851 if arg1
>= recvval
.length
or arg1
< 0 then
852 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
854 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
856 else if pname
== "copy_to" then
857 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
858 var destval
= args
[1].val
.as(FlatBuffer)
859 var lenval
= args
[2].to_i
860 var fromval
= args
[3].to_i
861 var toval
= args
[4].to_i
863 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
865 if fromval
+ lenval
>= recvval
.length
then
866 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
869 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
871 if toval
+ lenval
>= destval
.length
then
872 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
874 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
876 else if pname
== "atoi" then
877 return v
.int_instance
(recvval
.to_i
)
878 else if pname
== "file_exists" then
879 return v
.bool_instance
(recvval
.to_s
.file_exists
)
880 else if pname
== "file_mkdir" then
883 else if pname
== "file_chdir" then
886 else if pname
== "file_realpath" then
887 return v
.native_string_instance
(recvval
.to_s
.realpath
)
888 else if pname
== "get_environ" then
889 var txt
= recvval
.to_s
.environ
890 return v
.native_string_instance
(txt
)
891 else if pname
== "system" then
892 var res
= sys
.system
(recvval
.to_s
)
893 return v
.int_instance
(res
)
894 else if pname
== "atof" then
895 return v
.float_instance
(recvval
.to_f
)
897 else if pname
== "calloc_string" then
898 return v
.native_string_instance
("!" * args
[1].to_i
)
899 else if cname
== "NativeArray" then
900 if pname
== "init" then
901 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
902 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
904 var recvval
= args
.first
.val
.as(Array[Instance])
905 if pname
== "[]" then
906 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
907 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
909 return recvval
[args
[1].to_i
]
910 else if pname
== "[]=" then
911 recvval
[args
[1].to_i
] = args
[2]
913 else if pname
== "length" then
914 return v
.int_instance
(recvval
.length
)
915 else if pname
== "copy_to" then
916 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
919 else if cname
== "NativeFile" then
920 if pname
== "native_stdout" then
921 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
922 else if pname
== "native_stdin" then
923 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
924 else if pname
== "native_stderr" then
925 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
926 else if pname
== "io_open_read" then
927 var a1
= args
[1].val
.as(Buffer)
928 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
929 else if pname
== "io_open_write" then
930 var a1
= args
[1].val
.as(Buffer)
931 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
933 var recvval
= args
.first
.val
934 if pname
== "io_write" then
935 var a1
= args
[1].val
.as(Buffer)
936 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
938 else if pname
== "io_read" then
939 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
940 var a1
= args
[1].val
.as(Buffer)
941 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
942 return v
.int_instance
(str
.length
)
943 else if pname
== "io_close" then
944 recvval
.as(IOS).close
945 return v
.int_instance
(0)
946 else if pname
== "address_is_null" then
947 return v
.false_instance
949 else if pname
== "calloc_array" then
950 var recvtype
= args
.first
.mtype
.as(MClassType)
952 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
953 mtype
= mtype
.arguments
.first
954 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
955 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
956 else if pname
== "native_argc" then
957 return v
.int_instance
(v
.arguments
.length
)
958 else if pname
== "native_argv" then
959 var txt
= v
.arguments
[args
[1].to_i
]
960 return v
.native_string_instance
(txt
)
961 else if pname
== "native_argc" then
962 return v
.int_instance
(v
.arguments
.length
)
963 else if pname
== "native_argv" then
964 var txt
= v
.arguments
[args
[1].to_i
]
965 return v
.native_string_instance
(txt
)
966 else if pname
== "get_time" then
967 return v
.int_instance
(get_time
)
968 else if pname
== "srand_from" then
969 srand_from
(args
[1].to_i
)
971 else if pname
== "atan2" then
972 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
973 else if pname
== "pi" then
974 return v
.float_instance
(pi
)
975 else if pname
== "lexer_goto" then
976 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
977 else if pname
== "lexer_accept" then
978 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
979 else if pname
== "parser_goto" then
980 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
981 else if pname
== "parser_action" then
982 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
983 else if pname
== "file_getcwd" then
984 return v
.native_string_instance
(getcwd
)
985 else if pname
== "errno" then
986 return v
.int_instance
(sys
.errno
)
987 else if pname
== "address_is_null" then
988 return v
.false_instance
990 if mpropdef
.is_intern
then
991 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
992 else if mpropdef
.is_extern
then
993 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
995 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
1001 redef class AbstractArray[E
]
1002 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1004 self.copy_to
(start
, len
, dest
, new_start
)
1008 redef class AAttrPropdef
1009 redef fun call
(v
, mpropdef
, args
)
1011 var recv
= args
.first
1012 assert recv
isa MutableInstance
1013 var attr
= self.mpropdef
.mproperty
1014 if mpropdef
== mreadpropdef
then
1015 assert args
.length
== 1
1016 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1017 return evaluate_expr
(v
, recv
)
1018 else if mpropdef
== mwritepropdef
then
1019 assert args
.length
== 2
1020 v
.write_attribute
(attr
, recv
, args
[1])
1027 # Evaluate and set the default value of the attribute in `recv`
1028 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1030 if is_lazy
then return
1031 var nexpr
= self.n_expr
1032 if nexpr
!= null then
1033 evaluate_expr
(v
, recv
)
1036 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1037 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1038 if mtype
isa MNullableType then
1039 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1043 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1045 assert recv
isa MutableInstance
1046 var nexpr
= self.n_expr
1047 assert nexpr
!= null
1048 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1050 var val
= v
.expr
(nexpr
)
1053 assert not v
.is_escaping
1054 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1059 redef class AClassdef
1060 # Execute an implicit `mpropdef` associated with the current node.
1061 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1063 if mpropdef
.mproperty
.is_root_init
then
1064 assert self.super_inits
== null
1065 assert args
.length
== 1
1066 if not mpropdef
.is_intro
then
1067 # standard call-next-method
1068 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1069 v
.call_without_varargs
(superpd
, args
)
1074 var super_inits
= self.super_inits
1075 if super_inits
!= null then
1076 var args_of_super
= args
1077 if args
.length
> 1 then args_of_super
= [args
.first
]
1078 for su
in super_inits
do
1079 v
.send
(su
, args_of_super
)
1082 var recv
= args
.first
1083 assert recv
isa MutableInstance
1085 # Collect undefined attributes
1086 for npropdef
in self.n_propdefs
do
1087 if npropdef
isa AAttrPropdef and not npropdef
.noinit
and npropdef
.n_expr
== null then
1088 v
.write_attribute
(npropdef
.mpropdef
.mproperty
, recv
, args
[i
])
1097 # Evaluate the node as a possible expression.
1098 # Return a possible value
1099 # NOTE: Do not call this method directly, but use `v.expr`
1100 # This method is here to be implemented by subclasses.
1101 private fun expr
(v
: NaiveInterpreter): nullable Instance
1103 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1107 # Evaluate the node as a statement.
1108 # NOTE: Do not call this method directly, but use `v.stmt`
1109 # This method is here to be implemented by subclasses (no need to return something).
1110 private fun stmt
(v
: NaiveInterpreter)
1117 redef class ABlockExpr
1120 var last
= self.n_expr
.last
1121 for e
in self.n_expr
do
1122 if e
== last
then break
1124 if v
.is_escaping
then return null
1131 for e
in self.n_expr
do
1133 if v
.is_escaping
then return
1138 redef class AVardeclExpr
1141 var ne
= self.n_expr
1144 if i
== null then return
1145 v
.frame
.map
[self.variable
.as(not null)] = i
1150 redef class AVarExpr
1153 return v
.frame
.map
[self.variable
.as(not null)]
1157 redef class AVarAssignExpr
1160 var i
= v
.expr
(self.n_value
)
1161 if i
== null then return null
1162 v
.frame
.map
[self.variable
.as(not null)] = i
1167 redef class AVarReassignExpr
1170 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1171 var value
= v
.expr
(self.n_value
)
1172 if value
== null then return
1173 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1175 v
.frame
.map
[self.variable
.as(not null)] = res
1179 redef class ASelfExpr
1182 return v
.frame
.arguments
.first
1186 redef class AContinueExpr
1189 var ne
= self.n_expr
1192 if i
== null then return
1195 v
.continuemark
= self.escapemark
1199 redef class ABreakExpr
1202 var ne
= self.n_expr
1205 if i
== null then return
1208 v
.breakmark
= self.escapemark
1212 redef class AReturnExpr
1215 var ne
= self.n_expr
1218 if i
== null then return
1221 v
.returnmark
= v
.frame
1225 redef class AAbortExpr
1236 var cond
= v
.expr
(self.n_expr
)
1237 if cond
== null then return null
1238 if cond
.is_true
then
1239 return v
.expr
(self.n_then
.as(not null))
1241 return v
.expr
(self.n_else
.as(not null))
1247 var cond
= v
.expr
(self.n_expr
)
1248 if cond
== null then return
1249 if cond
.is_true
then
1257 redef class AIfexprExpr
1260 var cond
= v
.expr
(self.n_expr
)
1261 if cond
== null then return null
1262 if cond
.is_true
then
1263 return v
.expr
(self.n_then
)
1265 return v
.expr
(self.n_else
)
1273 v
.stmt
(self.n_block
)
1274 v
.is_break
(self.escapemark
) # Clear the break (if any)
1278 redef class AWhileExpr
1282 var cond
= v
.expr
(self.n_expr
)
1283 if cond
== null then return
1284 if not cond
.is_true
then return
1285 v
.stmt
(self.n_block
)
1286 if v
.is_break
(self.escapemark
) then return
1287 v
.is_continue
(self.escapemark
) # Clear the break
1288 if v
.is_escaping
then return
1293 redef class ALoopExpr
1297 v
.stmt
(self.n_block
)
1298 if v
.is_break
(self.escapemark
) then return
1299 v
.is_continue
(self.escapemark
) # Clear the break
1300 if v
.is_escaping
then return
1305 redef class AForExpr
1308 var col
= v
.expr
(self.n_expr
)
1309 if col
== null then return
1310 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1312 #self.debug("col {col}")
1313 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1314 #self.debug("iter {iter}")
1316 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1317 if not isok
.is_true
then return
1318 if self.variables
.length
== 1 then
1319 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1320 #self.debug("item {item}")
1321 v
.frame
.map
[self.variables
.first
] = item
1322 else if self.variables
.length
== 2 then
1323 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1324 v
.frame
.map
[self.variables
[0]] = key
1325 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1326 v
.frame
.map
[self.variables
[1]] = item
1330 v
.stmt
(self.n_block
)
1331 if v
.is_break
(self.escapemark
) then return
1332 v
.is_continue
(self.escapemark
) # Clear the break
1333 if v
.is_escaping
then return
1334 v
.callsite
(method_next
, [iter
])
1339 redef class AAssertExpr
1342 var cond
= v
.expr
(self.n_expr
)
1343 if cond
== null then return
1344 if not cond
.is_true
then
1346 if v
.is_escaping
then return
1349 fatal
(v
, "Assert '{nid.text}' failed")
1351 fatal
(v
, "Assert failed")
1361 var cond
= v
.expr
(self.n_expr
)
1362 if cond
== null then return null
1363 if cond
.is_true
then return cond
1364 return v
.expr
(self.n_expr2
)
1368 redef class AImpliesExpr
1371 var cond
= v
.expr
(self.n_expr
)
1372 if cond
== null then return null
1373 if not cond
.is_true
then return v
.true_instance
1374 return v
.expr
(self.n_expr2
)
1378 redef class AAndExpr
1381 var cond
= v
.expr
(self.n_expr
)
1382 if cond
== null then return null
1383 if not cond
.is_true
then return cond
1384 return v
.expr
(self.n_expr2
)
1388 redef class ANotExpr
1391 var cond
= v
.expr
(self.n_expr
)
1392 if cond
== null then return null
1393 return v
.bool_instance
(not cond
.is_true
)
1397 redef class AOrElseExpr
1400 var i
= v
.expr
(self.n_expr
)
1401 if i
== null then return null
1402 if i
!= v
.null_instance
then return i
1403 return v
.expr
(self.n_expr2
)
1407 redef class AIntExpr
1410 return v
.int_instance
(self.value
.as(not null))
1414 redef class AFloatExpr
1417 return v
.float_instance
(self.value
.as(not null))
1421 redef class ACharExpr
1424 return v
.char_instance
(self.value
.as(not null))
1428 redef class AArrayExpr
1431 var val
= new Array[Instance]
1432 for nexpr
in self.n_exprs
.n_exprs
do
1433 var i
= v
.expr
(nexpr
)
1434 if i
== null then return null
1437 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1438 var elttype
= mtype
.arguments
.first
1439 return v
.array_instance
(val
, elttype
)
1443 redef class AStringFormExpr
1446 var txt
= self.value
.as(not null)
1447 var nat
= v
.native_string_instance
(txt
)
1448 var res
= v
.send
(v
.force_get_primitive_method
("to_s", nat
.mtype
), [nat
]).as(not null)
1453 redef class ASuperstringExpr
1456 var array
= new Array[Instance]
1457 for nexpr
in n_exprs
do
1458 var i
= v
.expr
(nexpr
)
1459 if i
== null then return null
1462 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1463 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1469 redef class ACrangeExpr
1472 var e1
= v
.expr
(self.n_expr
)
1473 if e1
== null then return null
1474 var e2
= v
.expr
(self.n_expr2
)
1475 if e2
== null then return null
1476 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1477 var res
= new MutableInstance(mtype
)
1478 v
.init_instance
(res
)
1479 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1484 redef class AOrangeExpr
1487 var e1
= v
.expr
(self.n_expr
)
1488 if e1
== null then return null
1489 var e2
= v
.expr
(self.n_expr2
)
1490 if e2
== null then return null
1491 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1492 var res
= new MutableInstance(mtype
)
1493 v
.init_instance
(res
)
1494 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1499 redef class ATrueExpr
1502 return v
.bool_instance
(true)
1506 redef class AFalseExpr
1509 return v
.bool_instance
(false)
1513 redef class ANullExpr
1516 return v
.null_instance
1520 redef class AIsaExpr
1523 var i
= v
.expr
(self.n_expr
)
1524 if i
== null then return null
1525 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1526 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1530 redef class AAsCastExpr
1533 var i
= v
.expr
(self.n_expr
)
1534 if i
== null then return null
1535 var mtype
= self.mtype
.as(not null)
1536 var amtype
= v
.unanchor_type
(mtype
)
1537 if not v
.is_subtype
(i
.mtype
, amtype
) then
1538 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1544 redef class AAsNotnullExpr
1547 var i
= v
.expr
(self.n_expr
)
1548 if i
== null then return null
1549 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1550 if i
.mtype
isa MNullType then
1551 fatal
(v
, "Cast failed")
1557 redef class AParExpr
1560 return v
.expr
(self.n_expr
)
1564 redef class AOnceExpr
1567 if v
.onces
.has_key
(self) then
1568 return v
.onces
[self]
1570 var res
= v
.expr
(self.n_expr
)
1571 if res
== null then return null
1578 redef class ASendExpr
1581 var recv
= v
.expr
(self.n_expr
)
1582 if recv
== null then return null
1584 for a
in self.raw_arguments
do
1586 if i
== null then return null
1590 var res
= v
.callsite
(callsite
, args
)
1595 redef class ASendReassignFormExpr
1598 var recv
= v
.expr
(self.n_expr
)
1599 if recv
== null then return
1601 for a
in self.raw_arguments
do
1603 if i
== null then return
1606 var value
= v
.expr
(self.n_value
)
1607 if value
== null then return
1609 var read
= v
.callsite
(callsite
, args
)
1612 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1613 assert write
!= null
1617 v
.callsite
(write_callsite
, args
)
1621 redef class ASuperExpr
1624 var recv
= v
.frame
.arguments
.first
1626 for a
in self.n_args
.n_exprs
do
1628 if i
== null then return null
1632 var callsite
= self.callsite
1633 if callsite
!= null then
1634 # Add additionnals arguments for the super init call
1635 if args
.length
== 1 then
1636 for i
in [0..callsite
.msignature
.arity
[ do
1637 args
.add
(v
.frame
.arguments
[i
+1])
1641 var res
= v
.callsite
(callsite
, args
)
1645 if args
.length
== 1 then
1646 args
= v
.frame
.arguments
1649 # stantard call-next-method
1650 var mpropdef
= self.mpropdef
1651 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1652 var res
= v
.call_without_varargs
(mpropdef
, args
)
1657 redef class ANewExpr
1660 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1661 var recv
: Instance = new MutableInstance(mtype
)
1662 v
.init_instance
(recv
)
1664 for a
in self.n_args
.n_exprs
do
1666 if i
== null then return null
1669 var res2
= v
.callsite
(callsite
, args
)
1670 if res2
!= null then
1671 #self.debug("got {res2} from {mproperty}. drop {recv}")
1678 redef class AAttrExpr
1681 var recv
= v
.expr
(self.n_expr
)
1682 if recv
== null then return null
1683 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1684 var mproperty
= self.mproperty
.as(not null)
1685 return v
.read_attribute
(mproperty
, recv
)
1689 redef class AAttrAssignExpr
1692 var recv
= v
.expr
(self.n_expr
)
1693 if recv
== null then return
1694 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1695 var i
= v
.expr
(self.n_value
)
1696 if i
== null then return
1697 var mproperty
= self.mproperty
.as(not null)
1698 v
.write_attribute
(mproperty
, recv
, i
)
1702 redef class AAttrReassignExpr
1705 var recv
= v
.expr
(self.n_expr
)
1706 if recv
== null then return
1707 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1708 var value
= v
.expr
(self.n_value
)
1709 if value
== null then return
1710 var mproperty
= self.mproperty
.as(not null)
1711 var attr
= v
.read_attribute
(mproperty
, recv
)
1712 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1714 v
.write_attribute
(mproperty
, recv
, res
)
1718 redef class AIssetAttrExpr
1721 var recv
= v
.expr
(self.n_expr
)
1722 if recv
== null then return null
1723 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1724 var mproperty
= self.mproperty
.as(not null)
1725 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1729 redef class ADebugTypeExpr