1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 private import parser
::tables
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 interpreter
.start
(mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 # The visitor that interprets the Nit Program by walking on the AST
57 class NaiveInterpreter
58 # The modelbuilder that know the AST and its associations with the model
59 var modelbuilder
: ModelBuilder
61 # The main module of the program (used to lookup method)
62 var mainmodule
: MModule
64 # The command line arguments of the interpreted program
65 # arguments.first is the program name
66 # arguments[1] is the first argument
67 var arguments
: Array[String]
69 # The main Sys instance
70 var mainobj
: nullable Instance is noinit
74 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
75 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
76 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
79 # Starts the interpreter on the main module of a program
80 fun start
(mainmodule
: MModule) do
81 var interpreter
= self
82 var sys_type
= mainmodule
.sys_type
83 if sys_type
== null then return # no class Sys
84 var mainobj
= new MutableInstance(sys_type
)
85 interpreter
.mainobj
= mainobj
86 interpreter
.init_instance
(mainobj
)
87 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
88 if initprop
!= null then
89 interpreter
.send
(initprop
, [mainobj
])
91 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
92 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
93 if mainprop
!= null then
94 interpreter
.send
(mainprop
, [mainobj
])
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 or a continue executed?
115 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
116 var escapemark
: nullable EscapeMark = null
118 # Is a return or a break or a continue executed?
119 # Use this function to know if you must skip the evaluation of statements
120 fun is_escaping
: Bool do return returnmark
!= null or escapemark
!= null
122 # The value associated with the current return/break/continue, if any.
123 # Set the value when you set a escapemark.
124 # Read the value when you catch a mark or reach the end of a method
125 var escapevalue
: nullable Instance = null
127 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
128 # If there is no break/continue or if `escapemark` is null then return false.
129 # Use this function to catch a potential break/continue.
130 fun is_escape
(escapemark
: nullable EscapeMark): Bool
132 if escapemark
!= null and self.escapemark
== escapemark
then
133 self.escapemark
= null
140 # Evaluate `n` as an expression in the current context.
141 # Return the value of the expression.
142 # If `n` cannot be evaluated, then aborts.
143 fun expr
(n
: AExpr): nullable Instance
145 var frame
= self.frame
146 var old
= frame
.current_node
147 frame
.current_node
= n
148 #n.debug("IN Execute expr")
150 if i
== null and not self.is_escaping
then
151 n
.debug
("inconsitance: no value and not escaping.")
153 var implicit_cast_to
= n
.implicit_cast_to
154 if implicit_cast_to
!= null then
155 var mtype
= self.unanchor_type
(implicit_cast_to
)
156 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
159 #n.debug("OUT Execute expr: value is {i}")
160 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
161 frame
.current_node
= old
165 # Evaluate `n` as a statement in the current context.
166 # Do nothing if `n` is null.
167 # If `n` cannot be evaluated, then aborts.
168 fun stmt
(n
: nullable AExpr)
171 var frame
= self.frame
172 var old
= frame
.current_node
173 frame
.current_node
= n
174 #n.debug("Execute stmt")
176 frame
.current_node
= old
180 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
181 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
183 # Return the boolean instance associated with `val`.
184 fun bool_instance
(val
: Bool): Instance
186 if val
then return self.true_instance
else return self.false_instance
189 # Return the integer instance associated with `val`.
190 fun int_instance
(val
: Int): Instance
192 var ic
= self.mainmodule
.get_primitive_class
("Int")
193 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
196 # Return the char instance associated with `val`.
197 fun char_instance
(val
: Char): Instance
199 var ic
= self.mainmodule
.get_primitive_class
("Char")
200 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
203 # Return the float instance associated with `val`.
204 fun float_instance
(val
: Float): Instance
206 var ic
= self.mainmodule
.get_primitive_class
("Float")
207 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
210 # The unique instance of the `true` value.
211 var true_instance
: Instance is noinit
213 # The unique instance of the `false` value.
214 var false_instance
: Instance is noinit
216 # The unique instance of the `null` value.
217 var null_instance
: Instance is noinit
219 # Return a new array made of `values`.
220 # The dynamic type of the result is Array[elttype].
221 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
223 assert not elttype
.need_anchor
224 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
225 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
226 var res
= new MutableInstance(mtype
)
227 self.init_instance
(res
)
228 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
232 fun value_instance
(object
: Object): Instance
234 if object
isa Int then
235 return int_instance
(object
)
236 else if object
isa Bool then
237 return bool_instance
(object
)
238 else if object
isa String then
239 return string_instance
(object
)
245 # Return a new native string initialized with `txt`
246 fun native_string_instance
(txt
: String): Instance
248 var val
= new FlatBuffer.from
(txt
)
250 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
251 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
254 # Return a new String instance for `txt`
255 fun string_instance
(txt
: String): Instance
257 var nat
= native_string_instance
(txt
)
258 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
263 # The current frame used to store local variables of the current method executed
264 fun frame
: Frame do return frames
.first
266 # The stack of all frames. The first one is the current one.
267 var frames
= new List[Frame]
269 # Return a stack trace. One line per function
270 fun stack_trace
: String
272 var b
= new FlatBuffer
273 b
.append
(",---- Stack trace -- - - -\n")
275 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
277 b
.append
("`------------------- - - -")
281 # Exit the program with a message
282 fun fatal
(message
: String)
284 if frames
.is_empty
then
287 self.frame
.current_node
.fatal
(self, message
)
292 # Debug on the current node
293 fun debug
(message
: String)
295 if frames
.is_empty
then
298 self.frame
.current_node
.debug
(message
)
302 # Retrieve the value of the variable in the current frame
303 fun read_variable
(v
: Variable): Instance
309 # Assign the value of the variable in the current frame
310 fun write_variable
(v
: Variable, value
: Instance)
316 # Store known methods, used to trace methods as they are reached
317 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
319 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
320 # This method is used to manage varargs in signatures and returns the real array
321 # of instances to use in the call.
322 # Return `null` if one of the evaluation of the arguments return null.
323 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
325 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
326 var res
= new Array[Instance]
329 if args
.is_empty
then return res
331 var vararg_rank
= msignature
.vararg_rank
332 var vararg_len
= args
.length
- msignature
.arity
333 if vararg_len
< 0 then vararg_len
= 0
335 for i
in [0..msignature
.arity
[ do
336 if i
== vararg_rank
then
338 if ne
isa AVarargExpr then
339 var e
= self.expr
(ne
.n_expr
)
340 if e
== null then return null
344 var vararg
= new Array[Instance]
345 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
346 var e
= self.expr
(args
[j
])
347 if e
== null then return null
350 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
351 res
.add
(self.array_instance
(vararg
, elttype
))
354 if i
> vararg_rank
then j
+= vararg_len
355 var e
= self.expr
(args
[j
])
356 if e
== null then return null
363 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
364 # Return a value if `mpropdef` is a function, or null if it is a procedure.
365 # The call is direct/static. There is no message-sending/late-binding.
366 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
368 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
369 self.discover_call_trace
.add mpropdef
370 self.debug
("Discovered {mpropdef}")
372 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
374 # Look for the AST node that implements the property
375 var mproperty
= mpropdef
.mproperty
376 var val
= mpropdef
.constant_value
377 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
378 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
379 self.parameter_check
(npropdef
, mpropdef
, args
)
380 return npropdef
.call
(self, mpropdef
, args
)
381 else if mproperty
.is_root_init
then
382 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
383 self.parameter_check
(nclassdef
, mpropdef
, args
)
384 return nclassdef
.call
(self, mpropdef
, args
)
385 else if val
!= null then
386 return value_instance
(val
)
388 fatal
("Fatal Error: method {mpropdef} not found in the AST")
393 # Generate type checks in the C code to check covariant parameters
394 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
396 var msignature
= mpropdef
.msignature
397 for i
in [0..msignature
.arity
[ do
398 # skip test for vararg since the array is instantiated with the correct polymorphic type
399 if msignature
.vararg_rank
== i
then continue
401 # skip if the cast is not required
402 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
403 if not origmtype
.need_anchor
then continue
405 # get the parameter type
406 var mtype
= msignature
.mparameters
[i
].mtype
407 var anchor
= args
.first
.mtype
.as(MClassType)
408 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
409 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
410 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
415 # Common code for runtime injected calls and normal calls
416 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
418 if mtype
isa MNullType then
419 if mproperty
.name
== "==" then
420 return self.bool_instance
(args
[0] == args
[1])
421 else if mproperty
.name
== "!=" then
422 return self.bool_instance
(args
[0] != args
[1])
424 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
425 fatal
("Receiver is null")
430 # Execute a full `callsite` for given `args`
431 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
432 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
434 var initializers
= callsite
.mpropdef
.initializers
435 if not initializers
.is_empty
then
436 var recv
= arguments
.first
438 for p
in initializers
do
439 if p
isa MMethod then
441 for x
in p
.intro
.msignature
.mparameters
do
442 args
.add arguments
[i
]
446 else if p
isa MAttribute then
447 assert recv
isa MutableInstance
448 recv
.attributes
[p
] = arguments
[i
]
452 assert i
== arguments
.length
454 return send
(callsite
.mproperty
, [recv
])
456 return send
(callsite
.mproperty
, arguments
)
459 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
460 # Return a value if `mproperty` is a function, or null if it is a procedure.
461 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
462 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
464 var recv
= args
.first
465 var mtype
= recv
.mtype
466 var ret
= send_commons
(mproperty
, args
, mtype
)
467 if ret
!= null then return ret
468 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
469 return self.call
(propdef
, args
)
472 # Read the attribute `mproperty` of an instance `recv` and return its value.
473 # If the attribute in not yet initialized, then aborts with an error message.
474 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
476 assert recv
isa MutableInstance
477 if not recv
.attributes
.has_key
(mproperty
) then
478 fatal
("Uninitialized attribute {mproperty.name}")
481 return recv
.attributes
[mproperty
]
484 # Replace in `recv` the value of the attribute `mproperty` by `value`
485 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
487 assert recv
isa MutableInstance
488 recv
.attributes
[mproperty
] = value
491 # Is the attribute `mproperty` initialized the instance `recv`?
492 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
494 assert recv
isa MutableInstance
495 return recv
.attributes
.has_key
(mproperty
)
498 # Collect attributes of a type in the order of their init
499 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
501 var cache
= self.collect_attr_propdef_cache
502 if cache
.has_key
(mtype
) then return cache
[mtype
]
504 var res
= new Array[AAttrPropdef]
505 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
506 self.mainmodule
.linearize_mclassdefs
(cds
)
508 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
509 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
510 for npropdef
in n
.n_propdefs
do
511 if npropdef
isa AAttrPropdef then
521 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
523 # Fill the initial values of the newly created instance `recv`.
524 # `recv.mtype` is used to know what must be filled.
525 fun init_instance
(recv
: Instance)
527 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
528 npropdef
.init_expr
(self, recv
)
532 # This function determine the correct type according the reciever of the current definition (self).
533 fun unanchor_type
(mtype
: MType): MType
535 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
538 # Placebo instance used to mark internal error result when `null` already have a meaning.
539 # TODO: replace with multiple return or something better
540 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
543 # An instance represents a value of the executed program.
544 abstract class Instance
545 # The dynamic type of the instance
546 # ASSERT: not self.mtype.is_anchored
549 # return true if the instance is the true value.
550 # return false if the instance is the true value.
552 fun is_true
: Bool do abort
554 # Return true if `self` IS `o` (using the Nit semantic of is)
555 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
557 # Human readable object identity "Type#number"
558 redef fun to_s
do return "{mtype}"
560 # Return the integer value if the instance is an integer.
562 fun to_i
: Int do abort
564 # Return the integer value if the instance is a float.
566 fun to_f
: Float do abort
568 # The real value encapsulated if the instance is primitive.
570 fun val
: Object do abort
573 # A instance with attribute (standards objects)
574 class MutableInstance
577 # The values of the attributes
578 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
581 # Special instance to handle primitives values (int, bool, etc.)
582 # The trick it just to encapsulate the <<real>> value
583 class PrimitiveInstance[E
: Object]
586 # The real value encapsulated
591 if val
== true then return true
592 if val
== false then return false
598 if not o
isa PrimitiveInstance[Object] then return false
599 return self.val
== o
.val
604 if not o
isa PrimitiveInstance[Object] then return false
605 return self.val
.is_same_instance
(o
.val
)
608 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
610 redef fun to_i
do return val
.as(Int)
612 redef fun to_f
do return val
.as(Float)
615 # Information about local variables in a running method
617 # The current visited node
618 # The node is stored by frame to keep a stack trace
619 var current_node
: ANode
620 # The executed property.
621 # A Method in case of a call, an attribute in case of a default initialization.
622 var mpropdef
: MPropDef
623 # Arguments of the method (the first is the receiver)
624 var arguments
: Array[Instance]
625 # Mapping between a variable and the current value
626 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
630 # Aborts the program with a message
631 # `v` is used to know if a colored message is displayed or not
632 fun fatal
(v
: NaiveInterpreter, message
: String)
634 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
635 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
637 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
638 sys
.stderr
.write
(v
.stack_trace
)
639 sys
.stderr
.write
("\n")
646 # Execute a `mpropdef` associated with the current node.
647 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
649 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
654 redef class AMethPropdef
657 redef fun call
(v
, mpropdef
, args
)
659 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
660 var res
= call_commons
(v
, mpropdef
, args
, f
)
662 if v
.returnmark
== f
then
671 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
675 for i
in [0..mpropdef
.msignature
.arity
[ do
676 var variable
= self.n_signature
.n_params
[i
].variable
677 assert variable
!= null
678 v
.write_variable
(variable
, arguments
[i
+1])
681 if mpropdef
.is_abstract
then
682 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
686 # Call the implicit super-init
687 var auto_super_inits
= self.auto_super_inits
688 if auto_super_inits
!= null then
689 var args
= [arguments
.first
]
690 for auto_super_init
in auto_super_inits
do
692 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
693 args
.add
(arguments
[i
])
695 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
696 v
.callsite
(auto_super_init
, args
)
699 if auto_super_call
then
700 # standard call-next-method
701 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
702 v
.call
(superpd
, arguments
)
705 if mpropdef
.is_intern
or mpropdef
.is_extern
then
706 var res
= intern_call
(v
, mpropdef
, arguments
)
707 if res
!= v
.error_instance
then return res
710 if n_block
!= null then
715 if mpropdef
.is_intern
then
716 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
717 else if mpropdef
.is_extern
then
718 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
720 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
725 # Interprets a intern or a shortcut extern method.
726 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
727 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
729 var pname
= mpropdef
.mproperty
.name
730 var cname
= mpropdef
.mclassdef
.mclass
.name
731 if pname
== "output" then
732 var recv
= args
.first
735 else if pname
== "object_id" then
736 var recv
= args
.first
737 if recv
isa PrimitiveInstance[Object] then
738 return v
.int_instance
(recv
.val
.object_id
)
740 return v
.int_instance
(recv
.object_id
)
742 else if pname
== "output_class_name" then
743 var recv
= args
.first
746 else if pname
== "native_class_name" then
747 var recv
= args
.first
748 var txt
= recv
.mtype
.to_s
749 return v
.native_string_instance
(txt
)
750 else if pname
== "==" then
751 # == is correctly redefined for instances
752 return v
.bool_instance
(args
[0] == args
[1])
753 else if pname
== "!=" then
754 return v
.bool_instance
(args
[0] != args
[1])
755 else if pname
== "is_same_type" then
756 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
757 else if pname
== "is_same_instance" then
758 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
759 else if pname
== "exit" then
762 else if pname
== "sys" then
764 else if cname
== "Int" then
765 var recvval
= args
[0].to_i
766 if pname
== "unary -" then
767 return v
.int_instance
(-args
[0].to_i
)
768 else if pname
== "+" then
769 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
770 else if pname
== "-" then
771 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
772 else if pname
== "*" then
773 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
774 else if pname
== "%" then
775 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
776 else if pname
== "/" then
777 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
778 else if pname
== "<" then
779 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
780 else if pname
== ">" then
781 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
782 else if pname
== "<=" then
783 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
784 else if pname
== ">=" then
785 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
786 else if pname
== "<=>" then
787 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
788 else if pname
== "ascii" then
789 return v
.char_instance
(args
[0].to_i
.ascii
)
790 else if pname
== "to_f" then
791 return v
.float_instance
(args
[0].to_i
.to_f
)
792 else if pname
== "lshift" then
793 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
794 else if pname
== "rshift" then
795 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
796 else if pname
== "rand" then
797 var res
= recvval
.rand
798 return v
.int_instance
(res
)
799 else if pname
== "bin_and" then
800 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
801 else if pname
== "bin_or" then
802 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
803 else if pname
== "bin_xor" then
804 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
805 else if pname
== "bin_not" then
806 return v
.int_instance
(args
[0].to_i
.bin_not
)
807 else if pname
== "native_int_to_s" then
808 return v
.native_string_instance
(recvval
.to_s
)
809 else if pname
== "strerror_ext" then
810 return v
.native_string_instance
(recvval
.strerror
)
812 else if cname
== "Char" then
813 var recv
= args
[0].val
.as(Char)
814 if pname
== "ascii" then
815 return v
.int_instance
(recv
.ascii
)
816 else if pname
== "successor" then
817 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
818 else if pname
== "predecessor" then
819 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
820 else if pname
== "<" then
821 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
822 else if pname
== ">" then
823 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
824 else if pname
== "<=" then
825 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
826 else if pname
== ">=" then
827 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
828 else if pname
== "<=>" then
829 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
831 else if cname
== "Float" then
832 var recv
= args
[0].to_f
833 if pname
== "unary -" then
834 return v
.float_instance
(-recv
)
835 else if pname
== "+" then
836 return v
.float_instance
(recv
+ args
[1].to_f
)
837 else if pname
== "-" then
838 return v
.float_instance
(recv
- args
[1].to_f
)
839 else if pname
== "*" then
840 return v
.float_instance
(recv
* args
[1].to_f
)
841 else if pname
== "/" then
842 return v
.float_instance
(recv
/ args
[1].to_f
)
843 else if pname
== "<" then
844 return v
.bool_instance
(recv
< args
[1].to_f
)
845 else if pname
== ">" then
846 return v
.bool_instance
(recv
> args
[1].to_f
)
847 else if pname
== "<=" then
848 return v
.bool_instance
(recv
<= args
[1].to_f
)
849 else if pname
== ">=" then
850 return v
.bool_instance
(recv
>= args
[1].to_f
)
851 else if pname
== "to_i" then
852 return v
.int_instance
(recv
.to_i
)
853 else if pname
== "cos" then
854 return v
.float_instance
(args
[0].to_f
.cos
)
855 else if pname
== "sin" then
856 return v
.float_instance
(args
[0].to_f
.sin
)
857 else if pname
== "tan" then
858 return v
.float_instance
(args
[0].to_f
.tan
)
859 else if pname
== "acos" then
860 return v
.float_instance
(args
[0].to_f
.acos
)
861 else if pname
== "asin" then
862 return v
.float_instance
(args
[0].to_f
.asin
)
863 else if pname
== "atan" then
864 return v
.float_instance
(args
[0].to_f
.atan
)
865 else if pname
== "sqrt" then
866 return v
.float_instance
(args
[0].to_f
.sqrt
)
867 else if pname
== "exp" then
868 return v
.float_instance
(args
[0].to_f
.exp
)
869 else if pname
== "log" then
870 return v
.float_instance
(args
[0].to_f
.log
)
871 else if pname
== "pow" then
872 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
873 else if pname
== "rand" then
874 return v
.float_instance
(args
[0].to_f
.rand
)
875 else if pname
== "abs" then
876 return v
.float_instance
(args
[0].to_f
.abs
)
877 else if pname
== "hypot_with" then
878 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
879 else if pname
== "is_nan" then
880 return v
.bool_instance
(args
[0].to_f
.is_nan
)
881 else if pname
== "is_inf_extern" then
882 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
884 else if cname
== "NativeString" then
885 if pname
== "new" then
886 return v
.native_string_instance
("!" * args
[1].to_i
)
888 var recvval
= args
.first
.val
.as(Buffer)
889 if pname
== "[]" then
890 var arg1
= args
[1].to_i
891 if arg1
>= recvval
.length
or arg1
< 0 then
892 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
894 return v
.char_instance
(recvval
.chars
[arg1
])
895 else if pname
== "[]=" then
896 var arg1
= args
[1].to_i
897 if arg1
>= recvval
.length
or arg1
< 0 then
898 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
900 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
902 else if pname
== "copy_to" then
903 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
904 var destval
= args
[1].val
.as(FlatBuffer)
905 var lenval
= args
[2].to_i
906 var fromval
= args
[3].to_i
907 var toval
= args
[4].to_i
909 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
911 if fromval
+ lenval
>= recvval
.length
then
912 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
915 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
917 if toval
+ lenval
>= destval
.length
then
918 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
920 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
922 else if pname
== "atoi" then
923 return v
.int_instance
(recvval
.to_i
)
924 else if pname
== "file_exists" then
925 return v
.bool_instance
(recvval
.to_s
.file_exists
)
926 else if pname
== "file_mkdir" then
929 else if pname
== "file_chdir" then
932 else if pname
== "file_realpath" then
933 return v
.native_string_instance
(recvval
.to_s
.realpath
)
934 else if pname
== "get_environ" then
935 var txt
= recvval
.to_s
.environ
936 return v
.native_string_instance
(txt
)
937 else if pname
== "system" then
938 var res
= sys
.system
(recvval
.to_s
)
939 return v
.int_instance
(res
)
940 else if pname
== "atof" then
941 return v
.float_instance
(recvval
.to_f
)
943 else if pname
== "calloc_string" then
944 return v
.native_string_instance
("!" * args
[1].to_i
)
945 else if cname
== "NativeArray" then
946 if pname
== "new" then
947 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
948 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
950 var recvval
= args
.first
.val
.as(Array[Instance])
951 if pname
== "[]" then
952 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
953 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
955 return recvval
[args
[1].to_i
]
956 else if pname
== "[]=" then
957 recvval
[args
[1].to_i
] = args
[2]
959 else if pname
== "length" then
960 return v
.int_instance
(recvval
.length
)
961 else if pname
== "copy_to" then
962 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
965 else if cname
== "NativeFile" then
966 if pname
== "native_stdout" then
967 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
968 else if pname
== "native_stdin" then
969 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
970 else if pname
== "native_stderr" then
971 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
972 else if pname
== "io_open_read" then
973 var a1
= args
[1].val
.as(Buffer)
974 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
975 else if pname
== "io_open_write" then
976 var a1
= args
[1].val
.as(Buffer)
977 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
979 var recvval
= args
.first
.val
980 if pname
== "io_write" then
981 var a1
= args
[1].val
.as(Buffer)
982 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
984 else if pname
== "io_read" then
985 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
986 var a1
= args
[1].val
.as(Buffer)
987 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
988 return v
.int_instance
(str
.length
)
989 else if pname
== "io_close" then
990 recvval
.as(IOS).close
991 return v
.int_instance
(0)
992 else if pname
== "address_is_null" then
993 return v
.false_instance
995 else if pname
== "calloc_array" then
996 var recvtype
= args
.first
.mtype
.as(MClassType)
998 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
999 mtype
= mtype
.arguments
.first
1000 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1001 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1002 else if pname
== "native_argc" then
1003 return v
.int_instance
(v
.arguments
.length
)
1004 else if pname
== "native_argv" then
1005 var txt
= v
.arguments
[args
[1].to_i
]
1006 return v
.native_string_instance
(txt
)
1007 else if pname
== "native_argc" then
1008 return v
.int_instance
(v
.arguments
.length
)
1009 else if pname
== "native_argv" then
1010 var txt
= v
.arguments
[args
[1].to_i
]
1011 return v
.native_string_instance
(txt
)
1012 else if pname
== "get_time" then
1013 return v
.int_instance
(get_time
)
1014 else if pname
== "srand_from" then
1015 srand_from
(args
[1].to_i
)
1017 else if pname
== "atan2" then
1018 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1019 else if pname
== "pi" then
1020 return v
.float_instance
(pi
)
1021 else if pname
== "lexer_goto" then
1022 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1023 else if pname
== "lexer_accept" then
1024 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1025 else if pname
== "parser_goto" then
1026 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1027 else if pname
== "parser_action" then
1028 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1029 else if pname
== "file_getcwd" then
1030 return v
.native_string_instance
(getcwd
)
1031 else if pname
== "errno" then
1032 return v
.int_instance
(sys
.errno
)
1033 else if pname
== "address_is_null" then
1034 return v
.false_instance
1036 return v
.error_instance
1040 redef class AbstractArray[E
]
1041 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1043 self.copy_to
(start
, len
, dest
, new_start
)
1047 redef class AAttrPropdef
1048 redef fun call
(v
, mpropdef
, args
)
1050 var recv
= args
.first
1051 assert recv
isa MutableInstance
1052 var attr
= self.mpropdef
.mproperty
1053 if mpropdef
== mreadpropdef
then
1054 assert args
.length
== 1
1055 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1056 return evaluate_expr
(v
, recv
)
1057 else if mpropdef
== mwritepropdef
then
1058 assert args
.length
== 2
1059 v
.write_attribute
(attr
, recv
, args
[1])
1066 # Evaluate and set the default value of the attribute in `recv`
1067 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1069 if is_lazy
then return
1071 evaluate_expr
(v
, recv
)
1074 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1075 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1076 if mtype
isa MNullableType then
1077 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1081 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1083 assert recv
isa MutableInstance
1084 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1089 var nexpr
= self.n_expr
1090 var nblock
= self.n_block
1091 if nexpr
!= null then
1093 else if nblock
!= null then
1095 assert v
.returnmark
== f
1098 v
.escapevalue
= null
1105 assert not v
.is_escaping
1106 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1111 redef class AClassdef
1112 # Execute an implicit `mpropdef` associated with the current node.
1113 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1115 if mpropdef
.mproperty
.is_root_init
then
1116 assert args
.length
== 1
1117 if not mpropdef
.is_intro
then
1118 # standard call-next-method
1119 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1120 v
.call
(superpd
, args
)
1130 # Evaluate the node as a possible expression.
1131 # Return a possible value
1132 # NOTE: Do not call this method directly, but use `v.expr`
1133 # This method is here to be implemented by subclasses.
1134 private fun expr
(v
: NaiveInterpreter): nullable Instance
1136 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1140 # Evaluate the node as a statement.
1141 # NOTE: Do not call this method directly, but use `v.stmt`
1142 # This method is here to be implemented by subclasses (no need to return something).
1143 private fun stmt
(v
: NaiveInterpreter)
1150 redef class ABlockExpr
1153 var last
= self.n_expr
.last
1154 for e
in self.n_expr
do
1155 if e
== last
then break
1157 if v
.is_escaping
then return null
1164 for e
in self.n_expr
do
1166 if v
.is_escaping
then return
1171 redef class AVardeclExpr
1174 var ne
= self.n_expr
1177 if i
== null then return
1178 v
.write_variable
(self.variable
.as(not null), i
)
1183 redef class AVarExpr
1186 return v
.read_variable
(self.variable
.as(not null))
1190 redef class AVarAssignExpr
1193 var i
= v
.expr
(self.n_value
)
1194 if i
== null then return null
1195 v
.write_variable
(self.variable
.as(not null), i
)
1200 redef class AVarReassignExpr
1203 var variable
= self.variable
.as(not null)
1204 var vari
= v
.read_variable
(variable
)
1205 var value
= v
.expr
(self.n_value
)
1206 if value
== null then return
1207 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1209 v
.write_variable
(variable
, res
)
1213 redef class ASelfExpr
1216 return v
.frame
.arguments
.first
1220 redef class AEscapeExpr
1223 var ne
= self.n_expr
1226 if i
== null then return
1229 v
.escapemark
= self.escapemark
1233 redef class AReturnExpr
1236 var ne
= self.n_expr
1239 if i
== null then return
1242 v
.returnmark
= v
.frame
1246 redef class AAbortExpr
1257 var cond
= v
.expr
(self.n_expr
)
1258 if cond
== null then return null
1259 if cond
.is_true
then
1260 return v
.expr
(self.n_then
.as(not null))
1262 return v
.expr
(self.n_else
.as(not null))
1268 var cond
= v
.expr
(self.n_expr
)
1269 if cond
== null then return
1270 if cond
.is_true
then
1278 redef class AIfexprExpr
1281 var cond
= v
.expr
(self.n_expr
)
1282 if cond
== null then return null
1283 if cond
.is_true
then
1284 return v
.expr
(self.n_then
)
1286 return v
.expr
(self.n_else
)
1294 v
.stmt
(self.n_block
)
1295 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1299 redef class AWhileExpr
1303 var cond
= v
.expr
(self.n_expr
)
1304 if cond
== null then return
1305 if not cond
.is_true
then return
1306 v
.stmt
(self.n_block
)
1307 if v
.is_escape
(self.break_mark
) then return
1308 v
.is_escape
(self.continue_mark
) # Clear the break
1309 if v
.is_escaping
then return
1314 redef class ALoopExpr
1318 v
.stmt
(self.n_block
)
1319 if v
.is_escape
(self.break_mark
) then return
1320 v
.is_escape
(self.continue_mark
) # Clear the break
1321 if v
.is_escaping
then return
1326 redef class AForExpr
1329 var col
= v
.expr
(self.n_expr
)
1330 if col
== null then return
1331 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1333 #self.debug("col {col}")
1334 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1335 #self.debug("iter {iter}")
1337 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1338 if not isok
.is_true
then break
1339 if self.variables
.length
== 1 then
1340 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1341 #self.debug("item {item}")
1342 v
.write_variable
(self.variables
.first
, item
)
1343 else if self.variables
.length
== 2 then
1344 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1345 v
.write_variable
(self.variables
[0], key
)
1346 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1347 v
.write_variable
(self.variables
[1], item
)
1351 v
.stmt
(self.n_block
)
1352 if v
.is_escape
(self.break_mark
) then break
1353 v
.is_escape
(self.continue_mark
) # Clear the break
1354 if v
.is_escaping
then break
1355 v
.callsite
(method_next
, [iter
])
1357 var method_finish
= self.method_finish
1358 if method_finish
!= null then
1359 v
.callsite
(method_finish
, [iter
])
1364 redef class AAssertExpr
1367 var cond
= v
.expr
(self.n_expr
)
1368 if cond
== null then return
1369 if not cond
.is_true
then
1371 if v
.is_escaping
then return
1374 fatal
(v
, "Assert '{nid.text}' failed")
1376 fatal
(v
, "Assert failed")
1386 var cond
= v
.expr
(self.n_expr
)
1387 if cond
== null then return null
1388 if cond
.is_true
then return cond
1389 return v
.expr
(self.n_expr2
)
1393 redef class AImpliesExpr
1396 var cond
= v
.expr
(self.n_expr
)
1397 if cond
== null then return null
1398 if not cond
.is_true
then return v
.true_instance
1399 return v
.expr
(self.n_expr2
)
1403 redef class AAndExpr
1406 var cond
= v
.expr
(self.n_expr
)
1407 if cond
== null then return null
1408 if not cond
.is_true
then return cond
1409 return v
.expr
(self.n_expr2
)
1413 redef class ANotExpr
1416 var cond
= v
.expr
(self.n_expr
)
1417 if cond
== null then return null
1418 return v
.bool_instance
(not cond
.is_true
)
1422 redef class AOrElseExpr
1425 var i
= v
.expr
(self.n_expr
)
1426 if i
== null then return null
1427 if i
!= v
.null_instance
then return i
1428 return v
.expr
(self.n_expr2
)
1432 redef class AIntExpr
1435 return v
.int_instance
(self.value
.as(not null))
1439 redef class AFloatExpr
1442 return v
.float_instance
(self.value
.as(not null))
1446 redef class ACharExpr
1449 return v
.char_instance
(self.value
.as(not null))
1453 redef class AArrayExpr
1456 var val
= new Array[Instance]
1457 for nexpr
in self.n_exprs
.n_exprs
do
1458 var i
= v
.expr
(nexpr
)
1459 if i
== null then return null
1462 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1463 var elttype
= mtype
.arguments
.first
1464 return v
.array_instance
(val
, elttype
)
1468 redef class AStringFormExpr
1471 var txt
= self.value
.as(not null)
1472 return v
.string_instance
(txt
)
1476 redef class ASuperstringExpr
1479 var array
= new Array[Instance]
1480 for nexpr
in n_exprs
do
1481 var i
= v
.expr
(nexpr
)
1482 if i
== null then return null
1485 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1486 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1492 redef class ACrangeExpr
1495 var e1
= v
.expr
(self.n_expr
)
1496 if e1
== null then return null
1497 var e2
= v
.expr
(self.n_expr2
)
1498 if e2
== null then return null
1499 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1500 var res
= new MutableInstance(mtype
)
1501 v
.init_instance
(res
)
1502 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1507 redef class AOrangeExpr
1510 var e1
= v
.expr
(self.n_expr
)
1511 if e1
== null then return null
1512 var e2
= v
.expr
(self.n_expr2
)
1513 if e2
== null then return null
1514 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1515 var res
= new MutableInstance(mtype
)
1516 v
.init_instance
(res
)
1517 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1522 redef class ATrueExpr
1525 return v
.bool_instance
(true)
1529 redef class AFalseExpr
1532 return v
.bool_instance
(false)
1536 redef class ANullExpr
1539 return v
.null_instance
1543 redef class AIsaExpr
1546 var i
= v
.expr
(self.n_expr
)
1547 if i
== null then return null
1548 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1549 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1553 redef class AAsCastExpr
1556 var i
= v
.expr
(self.n_expr
)
1557 if i
== null then return null
1558 var mtype
= self.mtype
.as(not null)
1559 var amtype
= v
.unanchor_type
(mtype
)
1560 if not v
.is_subtype
(i
.mtype
, amtype
) then
1561 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1567 redef class AAsNotnullExpr
1570 var i
= v
.expr
(self.n_expr
)
1571 if i
== null then return null
1572 if i
.mtype
isa MNullType then
1573 fatal
(v
, "Cast failed")
1579 redef class AParExpr
1582 return v
.expr
(self.n_expr
)
1586 redef class AOnceExpr
1589 if v
.onces
.has_key
(self) then
1590 return v
.onces
[self]
1592 var res
= v
.expr
(self.n_expr
)
1593 if res
== null then return null
1600 redef class ASendExpr
1603 var recv
= v
.expr
(self.n_expr
)
1604 if recv
== null then return null
1605 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1606 if args
== null then return null
1608 var res
= v
.callsite
(callsite
, args
)
1613 redef class ASendReassignFormExpr
1616 var recv
= v
.expr
(self.n_expr
)
1617 if recv
== null then return
1618 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1619 if args
== null then return
1620 var value
= v
.expr
(self.n_value
)
1621 if value
== null then return
1623 var read
= v
.callsite
(callsite
, args
)
1626 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1627 assert write
!= null
1631 v
.callsite
(write_callsite
, args
)
1635 redef class ASuperExpr
1638 var recv
= v
.frame
.arguments
.first
1640 var callsite
= self.callsite
1641 if callsite
!= null then
1642 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1643 if args
== null then return null
1644 # Add additional arguments for the super init call
1645 if args
.length
== 1 then
1646 for i
in [0..callsite
.msignature
.arity
[ do
1647 args
.add
(v
.frame
.arguments
[i
+1])
1651 var res
= v
.callsite
(callsite
, args
)
1655 # standard call-next-method
1656 var mpropdef
= self.mpropdef
1657 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1659 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1660 if args
== null then return null
1662 if args
.length
== 1 then
1663 args
= v
.frame
.arguments
1665 var res
= v
.call
(mpropdef
, args
)
1670 redef class ANewExpr
1673 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1674 var recv
: Instance = new MutableInstance(mtype
)
1675 v
.init_instance
(recv
)
1676 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1677 if args
== null then return null
1678 var res2
= v
.callsite
(callsite
, args
)
1679 if res2
!= null then
1680 #self.debug("got {res2} from {mproperty}. drop {recv}")
1687 redef class AAttrExpr
1690 var recv
= v
.expr
(self.n_expr
)
1691 if recv
== null then return null
1692 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1693 var mproperty
= self.mproperty
.as(not null)
1694 return v
.read_attribute
(mproperty
, recv
)
1698 redef class AAttrAssignExpr
1701 var recv
= v
.expr
(self.n_expr
)
1702 if recv
== null then return
1703 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1704 var i
= v
.expr
(self.n_value
)
1705 if i
== null then return
1706 var mproperty
= self.mproperty
.as(not null)
1707 v
.write_attribute
(mproperty
, recv
, i
)
1711 redef class AAttrReassignExpr
1714 var recv
= v
.expr
(self.n_expr
)
1715 if recv
== null then return
1716 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1717 var value
= v
.expr
(self.n_value
)
1718 if value
== null then return
1719 var mproperty
= self.mproperty
.as(not null)
1720 var attr
= v
.read_attribute
(mproperty
, recv
)
1721 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1723 v
.write_attribute
(mproperty
, recv
, res
)
1727 redef class AIssetAttrExpr
1730 var recv
= v
.expr
(self.n_expr
)
1731 if recv
== null then return null
1732 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1733 var mproperty
= self.mproperty
.as(not null)
1734 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1738 redef class ADebugTypeExpr