1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 private import parser
::tables
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 interpreter
.start
(mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 # The visitor that interprets the Nit Program by walking on the AST
57 class NaiveInterpreter
58 # The modelbuilder that know the AST and its associations with the model
59 var modelbuilder
: ModelBuilder
61 # The main module of the program (used to lookup method)
62 var mainmodule
: MModule
64 # The command line arguments of the interpreted program
65 # arguments.first is the program name
66 # arguments[1] is the first argument
67 var arguments
: Array[String]
69 # The main Sys instance
70 var mainobj
: nullable Instance is noinit
74 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
75 init_instance_primitive
(self.true_instance
)
76 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
77 init_instance_primitive
(self.false_instance
)
78 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
81 # Starts the interpreter on the main module of a program
82 fun start
(mainmodule
: MModule) do
83 var interpreter
= self
84 var sys_type
= mainmodule
.sys_type
85 if sys_type
== null then return # no class Sys
86 var mainobj
= new MutableInstance(sys_type
)
87 interpreter
.mainobj
= mainobj
88 interpreter
.init_instance
(mainobj
)
89 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
90 if initprop
!= null then
91 interpreter
.send
(initprop
, [mainobj
])
93 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
94 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
95 if mainprop
!= null then
96 interpreter
.send
(mainprop
, [mainobj
])
100 # Subtype test in the context of the mainmodule
101 fun is_subtype
(sub
, sup
: MType): Bool
103 return sub
.is_subtype
(self.mainmodule
, current_receiver_class
, sup
)
106 # Get a primitive method in the context of the main module
107 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
109 assert recv
isa MClassType
110 return self.modelbuilder
.force_get_primitive_method
(current_node
, name
, recv
.mclass
, self.mainmodule
)
113 # Is a return executed?
114 # Set this mark to skip the evaluation until the end of the specified method frame
115 var returnmark
: nullable Frame = null
117 # Is a break or a continue executed?
118 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
119 var escapemark
: nullable EscapeMark = null
121 # Is a return or a break or a continue executed?
122 # Use this function to know if you must skip the evaluation of statements
123 fun is_escaping
: Bool do return returnmark
!= null or escapemark
!= null
125 # The value associated with the current return/break/continue, if any.
126 # Set the value when you set a escapemark.
127 # Read the value when you catch a mark or reach the end of a method
128 var escapevalue
: nullable Instance = null
130 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
131 # If there is no break/continue or if `escapemark` is null then return false.
132 # Use this function to catch a potential break/continue.
133 fun is_escape
(escapemark
: nullable EscapeMark): Bool
135 if escapemark
!= null and self.escapemark
== escapemark
then
136 self.escapemark
= null
143 # Evaluate `n` as an expression in the current context.
144 # Return the value of the expression.
145 # If `n` cannot be evaluated, then aborts.
146 fun expr
(n
: AExpr): nullable Instance
148 var frame
= self.frame
149 var old
= frame
.current_node
150 frame
.current_node
= n
151 #n.debug("IN Execute expr")
153 if i
== null and not self.is_escaping
then
154 n
.debug
("inconsitance: no value and not escaping.")
156 var implicit_cast_to
= n
.implicit_cast_to
157 if implicit_cast_to
!= null then
158 var mtype
= self.unanchor_type
(implicit_cast_to
)
159 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
162 #n.debug("OUT Execute expr: value is {i}")
163 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
164 frame
.current_node
= old
168 # Evaluate `n` as a statement in the current context.
169 # Do nothing if `n` is null.
170 # If `n` cannot be evaluated, then aborts.
171 fun stmt
(n
: nullable AExpr)
174 var frame
= self.frame
175 var old
= frame
.current_node
176 frame
.current_node
= n
177 #n.debug("Execute stmt")
179 frame
.current_node
= old
183 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
184 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
186 # Return the boolean instance associated with `val`.
187 fun bool_instance
(val
: Bool): Instance
189 if val
then return self.true_instance
else return self.false_instance
192 # Return the integer instance associated with `val`.
193 fun int_instance
(val
: Int): Instance
195 var ic
= get_primitive_class
("Int")
196 var instance
= new PrimitiveInstance[Int](ic
.mclass_type
, val
)
197 init_instance_primitive
(instance
)
201 # Return the char instance associated with `val`.
202 fun char_instance
(val
: Char): Instance
204 var ic
= get_primitive_class
("Char")
205 var instance
= new PrimitiveInstance[Char](ic
.mclass_type
, val
)
206 init_instance_primitive
(instance
)
210 # Return the float instance associated with `val`.
211 fun float_instance
(val
: Float): Instance
213 var ic
= get_primitive_class
("Float")
214 var instance
= new PrimitiveInstance[Float](ic
.mclass_type
, val
)
215 init_instance_primitive
(instance
)
219 # The unique instance of the `true` value.
220 var true_instance
: Instance is noinit
222 # The unique instance of the `false` value.
223 var false_instance
: Instance is noinit
225 # The unique instance of the `null` value.
226 var null_instance
: Instance is noinit
228 # Return a new array made of `values`.
229 # The dynamic type of the result is Array[elttype].
230 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
232 assert not elttype
.need_anchor
233 var nat
= new PrimitiveInstance[Array[Instance]](get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
234 init_instance_primitive
(nat
)
235 var mtype
= get_primitive_class
("Array").get_mtype
([elttype
])
236 var res
= new MutableInstance(mtype
)
237 self.init_instance
(res
)
238 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
242 # Return a instance associated to a primitive class
243 # Current primitive classes are `Int`, `Bool`, and `String`
244 fun value_instance
(object
: Object): Instance
246 if object
isa Int then
247 return int_instance
(object
)
248 else if object
isa Bool then
249 return bool_instance
(object
)
250 else if object
isa String then
251 return string_instance
(object
)
257 # Return a new native string initialized with `txt`
258 fun native_string_instance
(txt
: String): Instance
260 var val
= new FlatBuffer.from
(txt
)
262 var ic
= get_primitive_class
("NativeString")
263 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
264 init_instance_primitive
(instance
)
268 # Return a new String instance for `txt`
269 fun string_instance
(txt
: String): Instance
271 var nat
= native_string_instance
(txt
)
272 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
277 # The current frame used to store local variables of the current method executed
278 fun frame
: Frame do return frames
.first
280 # The stack of all frames. The first one is the current one.
281 var frames
= new List[Frame]
283 # Return a stack trace. One line per function
284 fun stack_trace
: String
286 var b
= new FlatBuffer
287 b
.append
(",---- Stack trace -- - - -\n")
289 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
291 b
.append
("`------------------- - - -")
295 # The current node, used to print errors, debug and stack-traces
296 fun current_node
: nullable ANode
298 if frames
.is_empty
then return null
299 return frames
.first
.current_node
302 # The dynamic type of the current `self`
303 fun current_receiver_class
: MClassType
305 return frames
.first
.arguments
.first
.mtype
.as(MClassType)
308 # Exit the program with a message
309 fun fatal
(message
: String)
311 var node
= current_node
315 node
.fatal
(self, message
)
320 # Debug on the current node
321 fun debug
(message
: String)
323 var node
= current_node
331 # Retrieve the value of the variable in the current frame
332 fun read_variable
(v
: Variable): Instance
338 # Assign the value of the variable in the current frame
339 fun write_variable
(v
: Variable, value
: Instance)
345 # Store known methods, used to trace methods as they are reached
346 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
348 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
349 # This method is used to manage varargs in signatures and returns the real array
350 # of instances to use in the call.
351 # Return `null` if one of the evaluation of the arguments return null.
352 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
354 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
355 var res
= new Array[Instance]
358 if args
.is_empty
then return res
360 var vararg_rank
= msignature
.vararg_rank
361 var vararg_len
= args
.length
- msignature
.arity
362 if vararg_len
< 0 then vararg_len
= 0
364 for i
in [0..msignature
.arity
[ do
365 if i
== vararg_rank
then
367 if ne
isa AVarargExpr then
368 var e
= self.expr
(ne
.n_expr
)
369 if e
== null then return null
373 var vararg
= new Array[Instance]
374 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
375 var e
= self.expr
(args
[j
])
376 if e
== null then return null
379 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
380 res
.add
(self.array_instance
(vararg
, elttype
))
383 if i
> vararg_rank
then j
+= vararg_len
384 var e
= self.expr
(args
[j
])
385 if e
== null then return null
392 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
393 # Return a value if `mpropdef` is a function, or null if it is a procedure.
394 # The call is direct/static. There is no message-sending/late-binding.
395 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
397 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
398 self.discover_call_trace
.add mpropdef
399 self.debug
("Discovered {mpropdef}")
401 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
403 # Look for the AST node that implements the property
404 var mproperty
= mpropdef
.mproperty
405 var val
= mpropdef
.constant_value
406 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
407 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
408 self.parameter_check
(npropdef
, mpropdef
, args
)
409 return npropdef
.call
(self, mpropdef
, args
)
410 else if mproperty
.is_root_init
then
411 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
412 self.parameter_check
(nclassdef
, mpropdef
, args
)
413 return nclassdef
.call
(self, mpropdef
, args
)
414 else if val
!= null then
415 return value_instance
(val
)
417 fatal
("Fatal Error: method {mpropdef} not found in the AST")
422 # Generate type checks in the C code to check covariant parameters
423 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
425 var msignature
= mpropdef
.msignature
426 for i
in [0..msignature
.arity
[ do
427 # skip test for vararg since the array is instantiated with the correct polymorphic type
428 if msignature
.vararg_rank
== i
then continue
430 # skip if the cast is not required
431 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
432 if not origmtype
.need_anchor
then continue
434 #print "{mpropdef}: {mpropdef.mproperty.intro.msignature.mparameters[i]}"
436 # get the parameter type
437 var mtype
= msignature
.mparameters
[i
].mtype
438 var anchor
= args
.first
.mtype
.as(MClassType)
439 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
440 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
441 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
446 # Common code for runtime injected calls and normal calls
447 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
449 if mtype
isa MNullType then
450 if mproperty
.name
== "==" then
451 return self.bool_instance
(args
[0] == args
[1])
452 else if mproperty
.name
== "!=" then
453 return self.bool_instance
(args
[0] != args
[1])
455 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
456 fatal
("Receiver is null")
461 # Execute a full `callsite` for given `args`
462 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
463 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
465 var initializers
= callsite
.mpropdef
.initializers
466 if not initializers
.is_empty
then
467 var recv
= arguments
.first
469 for p
in initializers
do
470 if p
isa MMethod then
472 for x
in p
.intro
.msignature
.mparameters
do
473 args
.add arguments
[i
]
477 else if p
isa MAttribute then
478 assert recv
isa MutableInstance
479 recv
.attributes
[p
] = arguments
[i
]
483 assert i
== arguments
.length
485 return send
(callsite
.mproperty
, [recv
])
487 return send
(callsite
.mproperty
, arguments
)
490 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
491 # Return a value if `mproperty` is a function, or null if it is a procedure.
492 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
493 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
495 var recv
= args
.first
496 var mtype
= recv
.mtype
497 var ret
= send_commons
(mproperty
, args
, mtype
)
498 if ret
!= null then return ret
499 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
500 return self.call
(propdef
, args
)
503 # Read the attribute `mproperty` of an instance `recv` and return its value.
504 # If the attribute in not yet initialized, then aborts with an error message.
505 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
507 assert recv
isa MutableInstance
508 if not recv
.attributes
.has_key
(mproperty
) then
509 fatal
("Uninitialized attribute {mproperty.name}")
512 return recv
.attributes
[mproperty
]
515 # Replace in `recv` the value of the attribute `mproperty` by `value`
516 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
518 assert recv
isa MutableInstance
519 recv
.attributes
[mproperty
] = value
522 # Is the attribute `mproperty` initialized the instance `recv`?
523 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
525 assert recv
isa MutableInstance
526 return recv
.attributes
.has_key
(mproperty
)
529 # Collect attributes of a type in the order of their init
530 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
532 var cache
= self.collect_attr_propdef_cache
533 if cache
.has_key
(mtype
) then return cache
[mtype
]
535 var res
= new Array[AAttrPropdef]
536 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
537 self.mainmodule
.linearize_mclassdefs
(cds
)
539 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
540 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
541 for npropdef
in n
.n_propdefs
do
542 if npropdef
isa AAttrPropdef then
552 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
554 # Fill the initial values of the newly created instance `recv`.
555 # `recv.mtype` is used to know what must be filled.
556 fun init_instance
(recv
: Instance)
558 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
559 npropdef
.init_expr
(self, recv
)
563 # A hook to initialize a `PrimitiveInstance`
564 fun init_instance_primitive
(recv
: Instance) do end
566 # Return the primitive `MClass` corresponding to the `name` given in parameter
567 # `name` : name of the primitive class
568 fun get_primitive_class
(name
: String): MClass
570 return mainmodule
.get_primitive_class
(name
)
573 # This function determine the correct type according the reciever of the current definition (self).
574 fun unanchor_type
(mtype
: MType): MType
576 return mtype
.anchor_to
(self.mainmodule
, current_receiver_class
)
579 # Placebo instance used to mark internal error result when `null` already have a meaning.
580 # TODO: replace with multiple return or something better
581 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
584 # An instance represents a value of the executed program.
585 abstract class Instance
586 # The dynamic type of the instance
587 # ASSERT: not self.mtype.is_anchored
590 # return true if the instance is the true value.
591 # return false if the instance is the true value.
593 fun is_true
: Bool do abort
595 # Return true if `self` IS `o` (using the Nit semantic of is)
596 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
598 # Human readable object identity "Type#number"
599 redef fun to_s
do return "{mtype}"
601 # Return the integer value if the instance is an integer.
603 fun to_i
: Int do abort
605 # Return the integer value if the instance is a float.
607 fun to_f
: Float do abort
609 # The real value encapsulated if the instance is primitive.
611 fun val
: nullable Object do abort
614 # A instance with attribute (standards objects)
615 class MutableInstance
618 # The values of the attributes
619 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
622 # Special instance to handle primitives values (int, bool, etc.)
623 # The trick it just to encapsulate the <<real>> value
624 class PrimitiveInstance[E
]
627 # The real value encapsulated
632 if val
== true then return true
633 if val
== false then return false
639 if not o
isa PrimitiveInstance[nullable Object] then return false
640 return self.val
== o
.val
645 if not o
isa PrimitiveInstance[nullable Object] then return false
646 return self.val
.is_same_instance
(o
.val
)
649 redef fun to_s
do return "{mtype}#{val.object_id}({val or else "null"})"
651 redef fun to_i
do return val
.as(Int)
653 redef fun to_f
do return val
.as(Float)
656 # Information about local variables in a running method
658 # The current visited node
659 # The node is stored by frame to keep a stack trace
660 var current_node
: ANode
661 # The executed property.
662 # A Method in case of a call, an attribute in case of a default initialization.
663 var mpropdef
: MPropDef
664 # Arguments of the method (the first is the receiver)
665 var arguments
: Array[Instance]
666 # Mapping between a variable and the current value
667 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
671 # Aborts the program with a message
672 # `v` is used to know if a colored message is displayed or not
673 fun fatal
(v
: NaiveInterpreter, message
: String)
675 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
676 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
678 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
679 sys
.stderr
.write
(v
.stack_trace
)
680 sys
.stderr
.write
("\n")
687 # Execute a `mpropdef` associated with the current node.
688 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
690 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
695 redef class AMethPropdef
698 redef fun call
(v
, mpropdef
, args
)
700 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
701 var res
= call_commons
(v
, mpropdef
, args
, f
)
703 if v
.returnmark
== f
then
712 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
716 for i
in [0..mpropdef
.msignature
.arity
[ do
717 var variable
= self.n_signature
.n_params
[i
].variable
718 assert variable
!= null
719 v
.write_variable
(variable
, arguments
[i
+1])
722 if mpropdef
.is_abstract
then
723 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
727 # Call the implicit super-init
728 var auto_super_inits
= self.auto_super_inits
729 if auto_super_inits
!= null then
730 var args
= [arguments
.first
]
731 for auto_super_init
in auto_super_inits
do
733 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
734 args
.add
(arguments
[i
])
736 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
737 v
.callsite
(auto_super_init
, args
)
740 if auto_super_call
then
741 # standard call-next-method
742 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
743 v
.call
(superpd
, arguments
)
746 if mpropdef
.is_intern
or mpropdef
.is_extern
then
747 var res
= intern_call
(v
, mpropdef
, arguments
)
748 if res
!= v
.error_instance
then return res
751 if n_block
!= null then
756 if mpropdef
.is_intern
then
757 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
758 else if mpropdef
.is_extern
then
759 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
761 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
766 # Interprets a intern or a shortcut extern method.
767 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
768 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
770 var pname
= mpropdef
.mproperty
.name
771 var cname
= mpropdef
.mclassdef
.mclass
.name
772 if pname
== "output" then
773 var recv
= args
.first
776 else if pname
== "object_id" then
777 var recv
= args
.first
778 if recv
isa PrimitiveInstance[Object] then
779 return v
.int_instance
(recv
.val
.object_id
)
781 return v
.int_instance
(recv
.object_id
)
783 else if pname
== "output_class_name" then
784 var recv
= args
.first
787 else if pname
== "native_class_name" then
788 var recv
= args
.first
789 var txt
= recv
.mtype
.to_s
790 return v
.native_string_instance
(txt
)
791 else if pname
== "==" then
792 # == is correctly redefined for instances
793 return v
.bool_instance
(args
[0] == args
[1])
794 else if pname
== "!=" then
795 return v
.bool_instance
(args
[0] != args
[1])
796 else if pname
== "is_same_type" then
797 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
798 else if pname
== "is_same_instance" then
799 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
800 else if pname
== "exit" then
803 else if pname
== "sys" then
805 else if cname
== "Int" then
806 var recvval
= args
[0].to_i
807 if pname
== "unary -" then
808 return v
.int_instance
(-args
[0].to_i
)
809 else if pname
== "+" then
810 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
811 else if pname
== "-" then
812 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
813 else if pname
== "*" then
814 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
815 else if pname
== "%" then
816 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
817 else if pname
== "/" then
818 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
819 else if pname
== "<" then
820 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
821 else if pname
== ">" then
822 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
823 else if pname
== "<=" then
824 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
825 else if pname
== ">=" then
826 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
827 else if pname
== "<=>" then
828 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
829 else if pname
== "ascii" then
830 return v
.char_instance
(args
[0].to_i
.ascii
)
831 else if pname
== "to_f" then
832 return v
.float_instance
(args
[0].to_i
.to_f
)
833 else if pname
== "lshift" then
834 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
835 else if pname
== "rshift" then
836 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
837 else if pname
== "rand" then
838 var res
= recvval
.rand
839 return v
.int_instance
(res
)
840 else if pname
== "bin_and" then
841 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
842 else if pname
== "bin_or" then
843 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
844 else if pname
== "bin_xor" then
845 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
846 else if pname
== "bin_not" then
847 return v
.int_instance
(args
[0].to_i
.bin_not
)
848 else if pname
== "native_int_to_s" then
849 return v
.native_string_instance
(recvval
.to_s
)
850 else if pname
== "strerror_ext" then
851 return v
.native_string_instance
(recvval
.strerror
)
853 else if cname
== "Char" then
854 var recv
= args
[0].val
.as(Char)
855 if pname
== "ascii" then
856 return v
.int_instance
(recv
.ascii
)
857 else if pname
== "successor" then
858 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
859 else if pname
== "predecessor" then
860 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
861 else if pname
== "<" then
862 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
863 else if pname
== ">" then
864 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
865 else if pname
== "<=" then
866 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
867 else if pname
== ">=" then
868 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
869 else if pname
== "<=>" then
870 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
872 else if cname
== "Float" then
873 var recv
= args
[0].to_f
874 if pname
== "unary -" then
875 return v
.float_instance
(-recv
)
876 else if pname
== "+" then
877 return v
.float_instance
(recv
+ args
[1].to_f
)
878 else if pname
== "-" then
879 return v
.float_instance
(recv
- args
[1].to_f
)
880 else if pname
== "*" then
881 return v
.float_instance
(recv
* args
[1].to_f
)
882 else if pname
== "/" then
883 return v
.float_instance
(recv
/ args
[1].to_f
)
884 else if pname
== "<" then
885 return v
.bool_instance
(recv
< args
[1].to_f
)
886 else if pname
== ">" then
887 return v
.bool_instance
(recv
> args
[1].to_f
)
888 else if pname
== "<=" then
889 return v
.bool_instance
(recv
<= args
[1].to_f
)
890 else if pname
== ">=" then
891 return v
.bool_instance
(recv
>= args
[1].to_f
)
892 else if pname
== "to_i" then
893 return v
.int_instance
(recv
.to_i
)
894 else if pname
== "cos" then
895 return v
.float_instance
(args
[0].to_f
.cos
)
896 else if pname
== "sin" then
897 return v
.float_instance
(args
[0].to_f
.sin
)
898 else if pname
== "tan" then
899 return v
.float_instance
(args
[0].to_f
.tan
)
900 else if pname
== "acos" then
901 return v
.float_instance
(args
[0].to_f
.acos
)
902 else if pname
== "asin" then
903 return v
.float_instance
(args
[0].to_f
.asin
)
904 else if pname
== "atan" then
905 return v
.float_instance
(args
[0].to_f
.atan
)
906 else if pname
== "sqrt" then
907 return v
.float_instance
(args
[0].to_f
.sqrt
)
908 else if pname
== "exp" then
909 return v
.float_instance
(args
[0].to_f
.exp
)
910 else if pname
== "log" then
911 return v
.float_instance
(args
[0].to_f
.log
)
912 else if pname
== "pow" then
913 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
914 else if pname
== "rand" then
915 return v
.float_instance
(args
[0].to_f
.rand
)
916 else if pname
== "abs" then
917 return v
.float_instance
(args
[0].to_f
.abs
)
918 else if pname
== "hypot_with" then
919 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
920 else if pname
== "is_nan" then
921 return v
.bool_instance
(args
[0].to_f
.is_nan
)
922 else if pname
== "is_inf_extern" then
923 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
924 else if pname
== "round" then
925 return v
.float_instance
(args
[0].to_f
.round
)
927 else if cname
== "NativeString" then
928 if pname
== "new" then
929 return v
.native_string_instance
("!" * args
[1].to_i
)
931 var recvval
= args
.first
.val
.as(Buffer)
932 if pname
== "[]" then
933 var arg1
= args
[1].to_i
934 if arg1
>= recvval
.length
or arg1
< 0 then
935 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
937 return v
.char_instance
(recvval
.chars
[arg1
])
938 else if pname
== "[]=" then
939 var arg1
= args
[1].to_i
940 if arg1
>= recvval
.length
or arg1
< 0 then
941 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
943 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
945 else if pname
== "copy_to" then
946 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
947 var destval
= args
[1].val
.as(FlatBuffer)
948 var lenval
= args
[2].to_i
949 var fromval
= args
[3].to_i
950 var toval
= args
[4].to_i
952 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
954 if fromval
+ lenval
>= recvval
.length
then
955 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
958 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
960 if toval
+ lenval
>= destval
.length
then
961 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
963 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
965 else if pname
== "atoi" then
966 return v
.int_instance
(recvval
.to_i
)
967 else if pname
== "file_exists" then
968 return v
.bool_instance
(recvval
.to_s
.file_exists
)
969 else if pname
== "file_mkdir" then
972 else if pname
== "file_chdir" then
975 else if pname
== "file_realpath" then
976 return v
.native_string_instance
(recvval
.to_s
.realpath
)
977 else if pname
== "get_environ" then
978 var txt
= recvval
.to_s
.environ
979 return v
.native_string_instance
(txt
)
980 else if pname
== "system" then
981 var res
= sys
.system
(recvval
.to_s
)
982 return v
.int_instance
(res
)
983 else if pname
== "atof" then
984 return v
.float_instance
(recvval
.to_f
)
986 else if cname
== "String" then
987 var cs
= v
.send
(v
.force_get_primitive_method
("to_cstring", args
.first
.mtype
), [args
.first
])
988 var str
= cs
.val
.to_s
989 if pname
== "files" then
990 var res
= new Array[Instance]
991 for f
in str
.files
do res
.add v
.string_instance
(f
)
992 return v
.array_instance
(res
, v
.get_primitive_class
("String").mclass_type
)
994 else if pname
== "calloc_string" then
995 return v
.native_string_instance
("!" * args
[1].to_i
)
996 else if cname
== "NativeArray" then
997 if pname
== "new" then
998 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
999 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
1000 v
.init_instance_primitive
(instance
)
1003 var recvval
= args
.first
.val
.as(Array[Instance])
1004 if pname
== "[]" then
1005 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
1006 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
1008 return recvval
[args
[1].to_i
]
1009 else if pname
== "[]=" then
1010 recvval
[args
[1].to_i
] = args
[2]
1012 else if pname
== "length" then
1013 return v
.int_instance
(recvval
.length
)
1014 else if pname
== "copy_to" then
1015 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1018 else if cname
== "NativeFile" then
1019 if pname
== "native_stdout" then
1020 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
1021 v
.init_instance_primitive
(instance
)
1023 else if pname
== "native_stdin" then
1024 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
1025 v
.init_instance_primitive
(instance
)
1027 else if pname
== "native_stderr" then
1028 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
1029 v
.init_instance_primitive
(instance
)
1031 else if pname
== "io_open_read" then
1032 var a1
= args
[1].val
.as(Buffer)
1033 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
1034 v
.init_instance_primitive
(instance
)
1036 else if pname
== "io_open_write" then
1037 var a1
= args
[1].val
.as(Buffer)
1038 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
1039 v
.init_instance_primitive
(instance
)
1042 var recvval
= args
.first
.val
1043 if pname
== "io_write" then
1044 var a1
= args
[1].val
.as(Buffer)
1045 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
1047 else if pname
== "io_read" then
1048 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
1049 var a1
= args
[1].val
.as(Buffer)
1050 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
1051 return v
.int_instance
(str
.length
)
1052 else if pname
== "io_close" then
1053 recvval
.as(IOS).close
1054 return v
.int_instance
(0)
1055 else if pname
== "address_is_null" then
1056 return v
.false_instance
1058 else if pname
== "calloc_array" then
1059 var recvtype
= args
.first
.mtype
.as(MClassType)
1061 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1062 mtype
= mtype
.arguments
.first
1063 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1064 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1065 v
.init_instance_primitive
(instance
)
1067 else if pname
== "native_argc" then
1068 return v
.int_instance
(v
.arguments
.length
)
1069 else if pname
== "native_argv" then
1070 var txt
= v
.arguments
[args
[1].to_i
]
1071 return v
.native_string_instance
(txt
)
1072 else if pname
== "native_argc" then
1073 return v
.int_instance
(v
.arguments
.length
)
1074 else if pname
== "native_argv" then
1075 var txt
= v
.arguments
[args
[1].to_i
]
1076 return v
.native_string_instance
(txt
)
1077 else if pname
== "get_time" then
1078 return v
.int_instance
(get_time
)
1079 else if pname
== "srand" then
1082 else if pname
== "srand_from" then
1083 srand_from
(args
[1].to_i
)
1085 else if pname
== "atan2" then
1086 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1087 else if pname
== "pi" then
1088 return v
.float_instance
(pi
)
1089 else if pname
== "lexer_goto" then
1090 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1091 else if pname
== "lexer_accept" then
1092 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1093 else if pname
== "parser_goto" then
1094 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1095 else if pname
== "parser_action" then
1096 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1097 else if pname
== "file_getcwd" then
1098 return v
.native_string_instance
(getcwd
)
1099 else if pname
== "errno" then
1100 return v
.int_instance
(sys
.errno
)
1101 else if pname
== "address_is_null" then
1102 return v
.false_instance
1104 return v
.error_instance
1108 redef class AAttrPropdef
1109 redef fun call
(v
, mpropdef
, args
)
1111 var recv
= args
.first
1112 assert recv
isa MutableInstance
1113 var attr
= self.mpropdef
.mproperty
1114 if mpropdef
== mreadpropdef
then
1115 assert args
.length
== 1
1116 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1117 return evaluate_expr
(v
, recv
)
1118 else if mpropdef
== mwritepropdef
then
1119 assert args
.length
== 2
1120 v
.write_attribute
(attr
, recv
, args
[1])
1127 # Evaluate and set the default value of the attribute in `recv`
1128 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1130 if is_lazy
then return
1132 evaluate_expr
(v
, recv
)
1135 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1136 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1137 if mtype
isa MNullableType then
1138 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1142 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1144 assert recv
isa MutableInstance
1145 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1150 var nexpr
= self.n_expr
1151 var nblock
= self.n_block
1152 if nexpr
!= null then
1154 else if nblock
!= null then
1156 assert v
.returnmark
== f
1159 v
.escapevalue
= null
1166 assert not v
.is_escaping
1167 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1172 redef class AClassdef
1173 # Execute an implicit `mpropdef` associated with the current node.
1174 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1176 if mpropdef
.mproperty
.is_root_init
then
1177 assert args
.length
== 1
1178 if not mpropdef
.is_intro
then
1179 # standard call-next-method
1180 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1181 v
.call
(superpd
, args
)
1191 # Evaluate the node as a possible expression.
1192 # Return a possible value
1193 # NOTE: Do not call this method directly, but use `v.expr`
1194 # This method is here to be implemented by subclasses.
1195 private fun expr
(v
: NaiveInterpreter): nullable Instance
1197 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1201 # Evaluate the node as a statement.
1202 # NOTE: Do not call this method directly, but use `v.stmt`
1203 # This method is here to be implemented by subclasses (no need to return something).
1204 private fun stmt
(v
: NaiveInterpreter)
1211 redef class ABlockExpr
1214 var last
= self.n_expr
.last
1215 for e
in self.n_expr
do
1216 if e
== last
then break
1218 if v
.is_escaping
then return null
1225 for e
in self.n_expr
do
1227 if v
.is_escaping
then return
1232 redef class AVardeclExpr
1235 var ne
= self.n_expr
1238 if i
== null then return
1239 v
.write_variable
(self.variable
.as(not null), i
)
1244 redef class AVarExpr
1247 return v
.read_variable
(self.variable
.as(not null))
1251 redef class AVarAssignExpr
1254 var i
= v
.expr
(self.n_value
)
1255 if i
== null then return null
1256 v
.write_variable
(self.variable
.as(not null), i
)
1261 redef class AVarReassignExpr
1264 var variable
= self.variable
.as(not null)
1265 var vari
= v
.read_variable
(variable
)
1266 var value
= v
.expr
(self.n_value
)
1267 if value
== null then return
1268 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1270 v
.write_variable
(variable
, res
)
1274 redef class ASelfExpr
1277 return v
.frame
.arguments
.first
1281 redef class AEscapeExpr
1284 var ne
= self.n_expr
1287 if i
== null then return
1290 v
.escapemark
= self.escapemark
1294 redef class AReturnExpr
1297 var ne
= self.n_expr
1300 if i
== null then return
1303 v
.returnmark
= v
.frame
1307 redef class AAbortExpr
1318 var cond
= v
.expr
(self.n_expr
)
1319 if cond
== null then return null
1320 if cond
.is_true
then
1321 return v
.expr
(self.n_then
.as(not null))
1323 return v
.expr
(self.n_else
.as(not null))
1329 var cond
= v
.expr
(self.n_expr
)
1330 if cond
== null then return
1331 if cond
.is_true
then
1339 redef class AIfexprExpr
1342 var cond
= v
.expr
(self.n_expr
)
1343 if cond
== null then return null
1344 if cond
.is_true
then
1345 return v
.expr
(self.n_then
)
1347 return v
.expr
(self.n_else
)
1355 v
.stmt
(self.n_block
)
1356 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1360 redef class AWhileExpr
1364 var cond
= v
.expr
(self.n_expr
)
1365 if cond
== null then return
1366 if not cond
.is_true
then return
1367 v
.stmt
(self.n_block
)
1368 if v
.is_escape
(self.break_mark
) then return
1369 v
.is_escape
(self.continue_mark
) # Clear the break
1370 if v
.is_escaping
then return
1375 redef class ALoopExpr
1379 v
.stmt
(self.n_block
)
1380 if v
.is_escape
(self.break_mark
) then return
1381 v
.is_escape
(self.continue_mark
) # Clear the break
1382 if v
.is_escaping
then return
1387 redef class AForExpr
1390 var col
= v
.expr
(self.n_expr
)
1391 if col
== null then return
1392 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1394 #self.debug("col {col}")
1395 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1396 #self.debug("iter {iter}")
1398 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1399 if not isok
.is_true
then break
1400 if self.variables
.length
== 1 then
1401 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1402 #self.debug("item {item}")
1403 v
.write_variable
(self.variables
.first
, item
)
1404 else if self.variables
.length
== 2 then
1405 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1406 v
.write_variable
(self.variables
[0], key
)
1407 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1408 v
.write_variable
(self.variables
[1], item
)
1412 v
.stmt
(self.n_block
)
1413 if v
.is_escape
(self.break_mark
) then break
1414 v
.is_escape
(self.continue_mark
) # Clear the break
1415 if v
.is_escaping
then break
1416 v
.callsite
(method_next
, [iter
])
1418 var method_finish
= self.method_finish
1419 if method_finish
!= null then
1420 v
.callsite
(method_finish
, [iter
])
1425 redef class AAssertExpr
1428 var cond
= v
.expr
(self.n_expr
)
1429 if cond
== null then return
1430 if not cond
.is_true
then
1432 if v
.is_escaping
then return
1435 fatal
(v
, "Assert '{nid.text}' failed")
1437 fatal
(v
, "Assert failed")
1447 var cond
= v
.expr
(self.n_expr
)
1448 if cond
== null then return null
1449 if cond
.is_true
then return cond
1450 return v
.expr
(self.n_expr2
)
1454 redef class AImpliesExpr
1457 var cond
= v
.expr
(self.n_expr
)
1458 if cond
== null then return null
1459 if not cond
.is_true
then return v
.true_instance
1460 return v
.expr
(self.n_expr2
)
1464 redef class AAndExpr
1467 var cond
= v
.expr
(self.n_expr
)
1468 if cond
== null then return null
1469 if not cond
.is_true
then return cond
1470 return v
.expr
(self.n_expr2
)
1474 redef class ANotExpr
1477 var cond
= v
.expr
(self.n_expr
)
1478 if cond
== null then return null
1479 return v
.bool_instance
(not cond
.is_true
)
1483 redef class AOrElseExpr
1486 var i
= v
.expr
(self.n_expr
)
1487 if i
== null then return null
1488 if i
!= v
.null_instance
then return i
1489 return v
.expr
(self.n_expr2
)
1493 redef class AIntExpr
1496 return v
.int_instance
(self.value
.as(not null))
1500 redef class AFloatExpr
1503 return v
.float_instance
(self.value
.as(not null))
1507 redef class ACharExpr
1510 return v
.char_instance
(self.value
.as(not null))
1514 redef class AArrayExpr
1517 var val
= new Array[Instance]
1518 for nexpr
in self.n_exprs
.n_exprs
do
1519 var i
= v
.expr
(nexpr
)
1520 if i
== null then return null
1523 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1524 var elttype
= mtype
.arguments
.first
1525 return v
.array_instance
(val
, elttype
)
1529 redef class AStringFormExpr
1532 var txt
= self.value
.as(not null)
1533 return v
.string_instance
(txt
)
1537 redef class ASuperstringExpr
1540 var array
= new Array[Instance]
1541 for nexpr
in n_exprs
do
1542 var i
= v
.expr
(nexpr
)
1543 if i
== null then return null
1546 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1547 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1553 redef class ACrangeExpr
1556 var e1
= v
.expr
(self.n_expr
)
1557 if e1
== null then return null
1558 var e2
= v
.expr
(self.n_expr2
)
1559 if e2
== null then return null
1560 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1561 var res
= new MutableInstance(mtype
)
1562 v
.init_instance
(res
)
1563 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1568 redef class AOrangeExpr
1571 var e1
= v
.expr
(self.n_expr
)
1572 if e1
== null then return null
1573 var e2
= v
.expr
(self.n_expr2
)
1574 if e2
== null then return null
1575 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1576 var res
= new MutableInstance(mtype
)
1577 v
.init_instance
(res
)
1578 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1583 redef class ATrueExpr
1586 return v
.bool_instance
(true)
1590 redef class AFalseExpr
1593 return v
.bool_instance
(false)
1597 redef class ANullExpr
1600 return v
.null_instance
1604 redef class AIsaExpr
1607 var i
= v
.expr
(self.n_expr
)
1608 if i
== null then return null
1609 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1610 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1614 redef class AAsCastExpr
1617 var i
= v
.expr
(self.n_expr
)
1618 if i
== null then return null
1619 var mtype
= self.mtype
.as(not null)
1620 var amtype
= v
.unanchor_type
(mtype
)
1621 if not v
.is_subtype
(i
.mtype
, amtype
) then
1622 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1628 redef class AAsNotnullExpr
1631 var i
= v
.expr
(self.n_expr
)
1632 if i
== null then return null
1633 if i
.mtype
isa MNullType then
1634 fatal
(v
, "Cast failed")
1640 redef class AParExpr
1643 return v
.expr
(self.n_expr
)
1647 redef class AOnceExpr
1650 if v
.onces
.has_key
(self) then
1651 return v
.onces
[self]
1653 var res
= v
.expr
(self.n_expr
)
1654 if res
== null then return null
1661 redef class ASendExpr
1664 var recv
= v
.expr
(self.n_expr
)
1665 if recv
== null then return null
1666 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1667 if args
== null then return null
1669 var res
= v
.callsite
(callsite
, args
)
1674 redef class ASendReassignFormExpr
1677 var recv
= v
.expr
(self.n_expr
)
1678 if recv
== null then return
1679 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1680 if args
== null then return
1681 var value
= v
.expr
(self.n_value
)
1682 if value
== null then return
1684 var read
= v
.callsite
(callsite
, args
)
1687 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1688 assert write
!= null
1692 v
.callsite
(write_callsite
, args
)
1696 redef class ASuperExpr
1699 var recv
= v
.frame
.arguments
.first
1701 var callsite
= self.callsite
1702 if callsite
!= null then
1703 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1704 if args
== null then return null
1705 # Add additional arguments for the super init call
1706 if args
.length
== 1 then
1707 for i
in [0..callsite
.msignature
.arity
[ do
1708 args
.add
(v
.frame
.arguments
[i
+1])
1712 var res
= v
.callsite
(callsite
, args
)
1716 # standard call-next-method
1717 var mpropdef
= self.mpropdef
1718 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1720 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1721 if args
== null then return null
1723 if args
.length
== 1 then
1724 args
= v
.frame
.arguments
1726 var res
= v
.call
(mpropdef
, args
)
1731 redef class ANewExpr
1734 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1735 var recv
: Instance = new MutableInstance(mtype
)
1736 v
.init_instance
(recv
)
1737 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1738 if args
== null then return null
1739 var res2
= v
.callsite
(callsite
, args
)
1740 if res2
!= null then
1741 #self.debug("got {res2} from {mproperty}. drop {recv}")
1748 redef class AAttrExpr
1751 var recv
= v
.expr
(self.n_expr
)
1752 if recv
== null then return null
1753 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1754 var mproperty
= self.mproperty
.as(not null)
1755 return v
.read_attribute
(mproperty
, recv
)
1759 redef class AAttrAssignExpr
1762 var recv
= v
.expr
(self.n_expr
)
1763 if recv
== null then return
1764 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1765 var i
= v
.expr
(self.n_value
)
1766 if i
== null then return
1767 var mproperty
= self.mproperty
.as(not null)
1768 v
.write_attribute
(mproperty
, recv
, i
)
1772 redef class AAttrReassignExpr
1775 var recv
= v
.expr
(self.n_expr
)
1776 if recv
== null then return
1777 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1778 var value
= v
.expr
(self.n_value
)
1779 if value
== null then return
1780 var mproperty
= self.mproperty
.as(not null)
1781 var attr
= v
.read_attribute
(mproperty
, recv
)
1782 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1784 v
.write_attribute
(mproperty
, recv
, res
)
1788 redef class AIssetAttrExpr
1791 var recv
= v
.expr
(self.n_expr
)
1792 if recv
== null then return null
1793 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1794 var mproperty
= self.mproperty
.as(not null)
1795 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1799 redef class ADebugTypeExpr