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
24 import primitive_types
26 redef class ToolContext
27 # --discover-call-trace
28 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
33 self.option_context
.add_option
(self.opt_discover_call_trace
)
37 redef class ModelBuilder
38 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
39 # `arguments` are the command-line arguments in order
41 # 1. the AST is fully loaded.
42 # 2. the model is fully built.
43 # 3. the instructions are fully analysed.
44 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
47 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
49 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
50 interpreter
.start
(mainmodule
)
53 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
57 # The visitor that interprets the Nit Program by walking on the AST
58 class NaiveInterpreter
59 # The modelbuilder that know the AST and its associations with the model
60 var modelbuilder
: ModelBuilder
62 # The main module of the program (used to lookup method)
63 var mainmodule
: MModule
65 # The command line arguments of the interpreted program
66 # arguments.first is the program name
67 # arguments[1] is the first argument
68 var arguments
: Array[String]
70 # The main Sys instance
71 var mainobj
: nullable Instance is noinit
75 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
76 init_instance_primitive
(self.true_instance
)
77 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
78 init_instance_primitive
(self.false_instance
)
79 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
82 # Starts the interpreter on the main module of a program
83 fun start
(mainmodule
: MModule) do
84 var interpreter
= self
85 var sys_type
= mainmodule
.sys_type
86 if sys_type
== null then return # no class Sys
87 var mainobj
= new MutableInstance(sys_type
)
88 interpreter
.mainobj
= mainobj
89 interpreter
.init_instance
(mainobj
)
90 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
91 if initprop
!= null then
92 interpreter
.send
(initprop
, [mainobj
])
94 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
95 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
96 if mainprop
!= null then
97 interpreter
.send
(mainprop
, [mainobj
])
101 # Subtype test in the context of the mainmodule
102 fun is_subtype
(sub
, sup
: MType): Bool
104 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
107 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
109 assert recv
isa MClassType
110 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
113 # Is a return executed?
114 # Set this mark to skip the evaluation until the end of the specified method frame
115 var returnmark
: nullable Frame = null
117 # Is a break 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 fun value_instance
(object
: Object): Instance
244 if object
isa Int then
245 return int_instance
(object
)
246 else if object
isa Bool then
247 return bool_instance
(object
)
248 else if object
isa String then
249 return string_instance
(object
)
255 # Return a new native string initialized with `txt`
256 fun native_string_instance
(txt
: String): Instance
258 var val
= new FlatBuffer.from
(txt
)
260 var ic
= get_primitive_class
("NativeString")
261 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
262 init_instance_primitive
(instance
)
266 # Return a new String instance for `txt`
267 fun string_instance
(txt
: String): Instance
269 var nat
= native_string_instance
(txt
)
270 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
275 # The current frame used to store local variables of the current method executed
276 fun frame
: Frame do return frames
.first
278 # The stack of all frames. The first one is the current one.
279 var frames
= new List[Frame]
281 # Return a stack trace. One line per function
282 fun stack_trace
: String
284 var b
= new FlatBuffer
285 b
.append
(",---- Stack trace -- - - -\n")
287 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
289 b
.append
("`------------------- - - -")
293 # Exit the program with a message
294 fun fatal
(message
: String)
296 if frames
.is_empty
then
299 self.frame
.current_node
.fatal
(self, message
)
304 # Debug on the current node
305 fun debug
(message
: String)
307 if frames
.is_empty
then
310 self.frame
.current_node
.debug
(message
)
314 # Retrieve the value of the variable in the current frame
315 fun read_variable
(v
: Variable): Instance
321 # Assign the value of the variable in the current frame
322 fun write_variable
(v
: Variable, value
: Instance)
328 # Store known methods, used to trace methods as they are reached
329 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
331 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
332 # This method is used to manage varargs in signatures and returns the real array
333 # of instances to use in the call.
334 # Return `null` if one of the evaluation of the arguments return null.
335 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
337 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
338 var res
= new Array[Instance]
341 if args
.is_empty
then return res
343 var vararg_rank
= msignature
.vararg_rank
344 var vararg_len
= args
.length
- msignature
.arity
345 if vararg_len
< 0 then vararg_len
= 0
347 for i
in [0..msignature
.arity
[ do
348 if i
== vararg_rank
then
350 if ne
isa AVarargExpr then
351 var e
= self.expr
(ne
.n_expr
)
352 if e
== null then return null
356 var vararg
= new Array[Instance]
357 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
358 var e
= self.expr
(args
[j
])
359 if e
== null then return null
362 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
363 res
.add
(self.array_instance
(vararg
, elttype
))
366 if i
> vararg_rank
then j
+= vararg_len
367 var e
= self.expr
(args
[j
])
368 if e
== null then return null
375 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
376 # Return a value if `mpropdef` is a function, or null if it is a procedure.
377 # The call is direct/static. There is no message-sending/late-binding.
378 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
380 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
381 self.discover_call_trace
.add mpropdef
382 self.debug
("Discovered {mpropdef}")
384 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
386 # Look for the AST node that implements the property
387 var mproperty
= mpropdef
.mproperty
388 var val
= mpropdef
.constant_value
389 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
390 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
391 self.parameter_check
(npropdef
, mpropdef
, args
)
392 return npropdef
.call
(self, mpropdef
, args
)
393 else if mproperty
.is_root_init
then
394 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
395 self.parameter_check
(nclassdef
, mpropdef
, args
)
396 return nclassdef
.call
(self, mpropdef
, args
)
397 else if val
!= null then
398 return value_instance
(val
)
400 fatal
("Fatal Error: method {mpropdef} not found in the AST")
405 # Generate type checks in the C code to check covariant parameters
406 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
408 var msignature
= mpropdef
.msignature
409 for i
in [0..msignature
.arity
[ do
410 # skip test for vararg since the array is instantiated with the correct polymorphic type
411 if msignature
.vararg_rank
== i
then continue
413 # skip if the cast is not required
414 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
415 if not origmtype
.need_anchor
then continue
417 # get the parameter type
418 var mtype
= msignature
.mparameters
[i
].mtype
419 var anchor
= args
.first
.mtype
.as(MClassType)
420 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
421 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
422 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
427 # Common code for runtime injected calls and normal calls
428 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
430 if mtype
isa MNullType then
431 if mproperty
.name
== "==" then
432 return self.bool_instance
(args
[0] == args
[1])
433 else if mproperty
.name
== "!=" then
434 return self.bool_instance
(args
[0] != args
[1])
436 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
437 fatal
("Receiver is null")
442 # Execute a full `callsite` for given `args`
443 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
444 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
446 var initializers
= callsite
.mpropdef
.initializers
447 if not initializers
.is_empty
then
448 var recv
= arguments
.first
450 for p
in initializers
do
451 if p
isa MMethod then
453 for x
in p
.intro
.msignature
.mparameters
do
454 args
.add arguments
[i
]
458 else if p
isa MAttribute then
459 assert recv
isa MutableInstance
460 recv
.attributes
[p
] = arguments
[i
]
464 assert i
== arguments
.length
466 return send
(callsite
.mproperty
, [recv
])
468 return send
(callsite
.mproperty
, arguments
)
471 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
472 # Return a value if `mproperty` is a function, or null if it is a procedure.
473 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
474 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
476 var recv
= args
.first
477 var mtype
= recv
.mtype
478 var ret
= send_commons
(mproperty
, args
, mtype
)
479 if ret
!= null then return ret
480 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
481 return self.call
(propdef
, args
)
484 # Read the attribute `mproperty` of an instance `recv` and return its value.
485 # If the attribute in not yet initialized, then aborts with an error message.
486 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
488 assert recv
isa MutableInstance
489 if not recv
.attributes
.has_key
(mproperty
) then
490 fatal
("Uninitialized attribute {mproperty.name}")
493 return recv
.attributes
[mproperty
]
496 # Replace in `recv` the value of the attribute `mproperty` by `value`
497 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
499 assert recv
isa MutableInstance
500 recv
.attributes
[mproperty
] = value
503 # Is the attribute `mproperty` initialized the instance `recv`?
504 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
506 assert recv
isa MutableInstance
507 return recv
.attributes
.has_key
(mproperty
)
510 # Collect attributes of a type in the order of their init
511 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
513 var cache
= self.collect_attr_propdef_cache
514 if cache
.has_key
(mtype
) then return cache
[mtype
]
516 var res
= new Array[AAttrPropdef]
517 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
518 self.mainmodule
.linearize_mclassdefs
(cds
)
520 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
521 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
522 for npropdef
in n
.n_propdefs
do
523 if npropdef
isa AAttrPropdef then
533 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
535 # Fill the initial values of the newly created instance `recv`.
536 # `recv.mtype` is used to know what must be filled.
537 fun init_instance
(recv
: Instance)
539 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
540 npropdef
.init_expr
(self, recv
)
544 # A hook to initialize a `PrimitiveInstance`
545 fun init_instance_primitive
(recv
: Instance) do end
547 # Return the primitive `MClass` corresponding to the `name` given in parameter
548 # `name` : name of the primitive class
549 fun get_primitive_class
(name
: String): MClass
551 return mainmodule
.get_primitive_class
(name
)
554 # This function determine the correct type according the reciever of the current definition (self).
555 fun unanchor_type
(mtype
: MType): MType
557 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
560 # Placebo instance used to mark internal error result when `null` already have a meaning.
561 # TODO: replace with multiple return or something better
562 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
565 # An instance represents a value of the executed program.
566 abstract class Instance
567 # The dynamic type of the instance
568 # ASSERT: not self.mtype.is_anchored
571 # return true if the instance is the true value.
572 # return false if the instance is the true value.
574 fun is_true
: Bool do abort
576 # Return true if `self` IS `o` (using the Nit semantic of is)
577 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
579 # Human readable object identity "Type#number"
580 redef fun to_s
do return "{mtype}"
582 # Return the integer value if the instance is an integer.
584 fun to_i
: Int do abort
586 # Return the integer value if the instance is a float.
588 fun to_f
: Float do abort
590 # The real value encapsulated if the instance is primitive.
592 fun val
: Object do abort
595 # A instance with attribute (standards objects)
596 class MutableInstance
599 # The values of the attributes
600 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
603 # Special instance to handle primitives values (int, bool, etc.)
604 # The trick it just to encapsulate the <<real>> value
605 class PrimitiveInstance[E
: Object]
608 # The real value encapsulated
613 if val
== true then return true
614 if val
== false then return false
620 if not o
isa PrimitiveInstance[Object] then return false
621 return self.val
== o
.val
626 if not o
isa PrimitiveInstance[Object] then return false
627 return self.val
.is_same_instance
(o
.val
)
630 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
632 redef fun to_i
do return val
.as(Int)
634 redef fun to_f
do return val
.as(Float)
637 # Information about local variables in a running method
639 # The current visited node
640 # The node is stored by frame to keep a stack trace
641 var current_node
: ANode
642 # The executed property.
643 # A Method in case of a call, an attribute in case of a default initialization.
644 var mpropdef
: MPropDef
645 # Arguments of the method (the first is the receiver)
646 var arguments
: Array[Instance]
647 # Mapping between a variable and the current value
648 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
652 # Aborts the program with a message
653 # `v` is used to know if a colored message is displayed or not
654 fun fatal
(v
: NaiveInterpreter, message
: String)
656 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
657 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
659 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
660 sys
.stderr
.write
(v
.stack_trace
)
661 sys
.stderr
.write
("\n")
668 # Execute a `mpropdef` associated with the current node.
669 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
671 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
676 redef class AMethPropdef
679 redef fun call
(v
, mpropdef
, args
)
681 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
682 var res
= call_commons
(v
, mpropdef
, args
, f
)
684 if v
.returnmark
== f
then
693 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
697 for i
in [0..mpropdef
.msignature
.arity
[ do
698 var variable
= self.n_signature
.n_params
[i
].variable
699 assert variable
!= null
700 v
.write_variable
(variable
, arguments
[i
+1])
703 if mpropdef
.is_abstract
then
704 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
708 # Call the implicit super-init
709 var auto_super_inits
= self.auto_super_inits
710 if auto_super_inits
!= null then
711 var args
= [arguments
.first
]
712 for auto_super_init
in auto_super_inits
do
714 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
715 args
.add
(arguments
[i
])
717 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
718 v
.callsite
(auto_super_init
, args
)
721 if auto_super_call
then
722 # standard call-next-method
723 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
724 v
.call
(superpd
, arguments
)
727 if mpropdef
.is_intern
or mpropdef
.is_extern
then
728 var res
= intern_call
(v
, mpropdef
, arguments
)
729 if res
!= v
.error_instance
then return res
732 if n_block
!= null then
737 if mpropdef
.is_intern
then
738 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
739 else if mpropdef
.is_extern
then
740 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
742 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
747 # Interprets a intern or a shortcut extern method.
748 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
749 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
751 var pname
= mpropdef
.mproperty
.name
752 var cname
= mpropdef
.mclassdef
.mclass
.name
753 if pname
== "output" then
754 var recv
= args
.first
757 else if pname
== "object_id" then
758 var recv
= args
.first
759 if recv
isa PrimitiveInstance[Object] then
760 return v
.int_instance
(recv
.val
.object_id
)
762 return v
.int_instance
(recv
.object_id
)
764 else if pname
== "output_class_name" then
765 var recv
= args
.first
768 else if pname
== "native_class_name" then
769 var recv
= args
.first
770 var txt
= recv
.mtype
.to_s
771 return v
.native_string_instance
(txt
)
772 else if pname
== "==" then
773 # == is correctly redefined for instances
774 return v
.bool_instance
(args
[0] == args
[1])
775 else if pname
== "!=" then
776 return v
.bool_instance
(args
[0] != args
[1])
777 else if pname
== "is_same_type" then
778 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
779 else if pname
== "is_same_instance" then
780 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
781 else if pname
== "exit" then
784 else if pname
== "sys" then
786 else if cname
== "Int" then
787 var recvval
= args
[0].to_i
788 if pname
== "unary -" then
789 return v
.int_instance
(-args
[0].to_i
)
790 else if pname
== "+" then
791 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
792 else if pname
== "-" then
793 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
794 else if pname
== "*" then
795 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
796 else if pname
== "%" then
797 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
798 else if pname
== "/" then
799 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
800 else if pname
== "<" then
801 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
802 else if pname
== ">" then
803 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
804 else if pname
== "<=" then
805 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
806 else if pname
== ">=" then
807 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
808 else if pname
== "<=>" then
809 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
810 else if pname
== "ascii" then
811 return v
.char_instance
(args
[0].to_i
.ascii
)
812 else if pname
== "to_f" then
813 return v
.float_instance
(args
[0].to_i
.to_f
)
814 else if pname
== "lshift" then
815 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
816 else if pname
== "rshift" then
817 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
818 else if pname
== "rand" then
819 var res
= recvval
.rand
820 return v
.int_instance
(res
)
821 else if pname
== "bin_and" then
822 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
823 else if pname
== "bin_or" then
824 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
825 else if pname
== "bin_xor" then
826 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
827 else if pname
== "bin_not" then
828 return v
.int_instance
(args
[0].to_i
.bin_not
)
829 else if pname
== "native_int_to_s" then
830 return v
.native_string_instance
(recvval
.to_s
)
831 else if pname
== "strerror_ext" then
832 return v
.native_string_instance
(recvval
.strerror
)
834 else if cname
== "Char" then
835 var recv
= args
[0].val
.as(Char)
836 if pname
== "ascii" then
837 return v
.int_instance
(recv
.ascii
)
838 else if pname
== "successor" then
839 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
840 else if pname
== "predecessor" then
841 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
842 else if pname
== "<" then
843 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
844 else if pname
== ">" then
845 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
846 else if pname
== "<=" then
847 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
848 else if pname
== ">=" then
849 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
850 else if pname
== "<=>" then
851 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
853 else if cname
== "Float" then
854 var recv
= args
[0].to_f
855 if pname
== "unary -" then
856 return v
.float_instance
(-recv
)
857 else if pname
== "+" then
858 return v
.float_instance
(recv
+ args
[1].to_f
)
859 else if pname
== "-" then
860 return v
.float_instance
(recv
- args
[1].to_f
)
861 else if pname
== "*" then
862 return v
.float_instance
(recv
* args
[1].to_f
)
863 else if pname
== "/" then
864 return v
.float_instance
(recv
/ args
[1].to_f
)
865 else if pname
== "<" then
866 return v
.bool_instance
(recv
< args
[1].to_f
)
867 else if pname
== ">" then
868 return v
.bool_instance
(recv
> args
[1].to_f
)
869 else if pname
== "<=" then
870 return v
.bool_instance
(recv
<= args
[1].to_f
)
871 else if pname
== ">=" then
872 return v
.bool_instance
(recv
>= args
[1].to_f
)
873 else if pname
== "to_i" then
874 return v
.int_instance
(recv
.to_i
)
875 else if pname
== "cos" then
876 return v
.float_instance
(args
[0].to_f
.cos
)
877 else if pname
== "sin" then
878 return v
.float_instance
(args
[0].to_f
.sin
)
879 else if pname
== "tan" then
880 return v
.float_instance
(args
[0].to_f
.tan
)
881 else if pname
== "acos" then
882 return v
.float_instance
(args
[0].to_f
.acos
)
883 else if pname
== "asin" then
884 return v
.float_instance
(args
[0].to_f
.asin
)
885 else if pname
== "atan" then
886 return v
.float_instance
(args
[0].to_f
.atan
)
887 else if pname
== "sqrt" then
888 return v
.float_instance
(args
[0].to_f
.sqrt
)
889 else if pname
== "exp" then
890 return v
.float_instance
(args
[0].to_f
.exp
)
891 else if pname
== "log" then
892 return v
.float_instance
(args
[0].to_f
.log
)
893 else if pname
== "pow" then
894 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
895 else if pname
== "rand" then
896 return v
.float_instance
(args
[0].to_f
.rand
)
897 else if pname
== "abs" then
898 return v
.float_instance
(args
[0].to_f
.abs
)
899 else if pname
== "hypot_with" then
900 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
901 else if pname
== "is_nan" then
902 return v
.bool_instance
(args
[0].to_f
.is_nan
)
903 else if pname
== "is_inf_extern" then
904 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
906 else if cname
== "NativeString" then
907 if pname
== "new" then
908 return v
.native_string_instance
("!" * args
[1].to_i
)
910 var recvval
= args
.first
.val
.as(Buffer)
911 if pname
== "[]" then
912 var arg1
= args
[1].to_i
913 if arg1
>= recvval
.length
or arg1
< 0 then
914 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
916 return v
.char_instance
(recvval
.chars
[arg1
])
917 else if pname
== "[]=" then
918 var arg1
= args
[1].to_i
919 if arg1
>= recvval
.length
or arg1
< 0 then
920 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
922 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
924 else if pname
== "copy_to" then
925 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
926 var destval
= args
[1].val
.as(FlatBuffer)
927 var lenval
= args
[2].to_i
928 var fromval
= args
[3].to_i
929 var toval
= args
[4].to_i
931 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
933 if fromval
+ lenval
>= recvval
.length
then
934 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
937 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
939 if toval
+ lenval
>= destval
.length
then
940 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
942 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
944 else if pname
== "atoi" then
945 return v
.int_instance
(recvval
.to_i
)
946 else if pname
== "file_exists" then
947 return v
.bool_instance
(recvval
.to_s
.file_exists
)
948 else if pname
== "file_mkdir" then
951 else if pname
== "file_chdir" then
954 else if pname
== "file_realpath" then
955 return v
.native_string_instance
(recvval
.to_s
.realpath
)
956 else if pname
== "get_environ" then
957 var txt
= recvval
.to_s
.environ
958 return v
.native_string_instance
(txt
)
959 else if pname
== "system" then
960 var res
= sys
.system
(recvval
.to_s
)
961 return v
.int_instance
(res
)
962 else if pname
== "atof" then
963 return v
.float_instance
(recvval
.to_f
)
965 else if pname
== "calloc_string" then
966 return v
.native_string_instance
("!" * args
[1].to_i
)
967 else if cname
== "NativeArray" then
968 if pname
== "new" then
969 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
970 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
971 v
.init_instance_primitive
(instance
)
974 var recvval
= args
.first
.val
.as(Array[Instance])
975 if pname
== "[]" then
976 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
977 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
979 return recvval
[args
[1].to_i
]
980 else if pname
== "[]=" then
981 recvval
[args
[1].to_i
] = args
[2]
983 else if pname
== "length" then
984 return v
.int_instance
(recvval
.length
)
985 else if pname
== "copy_to" then
986 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
989 else if cname
== "NativeFile" then
990 if pname
== "native_stdout" then
991 var inst
= new PrimitiveNativeFile.native_stdout
992 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
993 v
.init_instance_primitive
(instance
)
995 else if pname
== "native_stdin" then
996 var inst
= new PrimitiveNativeFile.native_stdin
997 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
998 v
.init_instance_primitive
(instance
)
1000 else if pname
== "native_stderr" then
1001 var inst
= new PrimitiveNativeFile.native_stderr
1002 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1003 v
.init_instance_primitive
(instance
)
1005 else if pname
== "io_open_read" then
1006 var a1
= args
[1].val
.as(Buffer)
1007 var inst
= new PrimitiveNativeFile.io_open_read
(a1
.to_s
)
1008 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1009 v
.init_instance_primitive
(instance
)
1011 else if pname
== "io_open_write" then
1012 var a1
= args
[1].val
.as(Buffer)
1013 var inst
= new PrimitiveNativeFile.io_open_write
(a1
.to_s
)
1014 var instance
= new PrimitiveInstance[PrimitiveNativeFile](mpropdef
.mclassdef
.mclass
.mclass_type
, inst
)
1015 v
.init_instance_primitive
(instance
)
1018 var recvval
= args
.first
.val
1019 if pname
== "io_write" then
1020 var a1
= args
[1].val
.as(Buffer)
1021 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_write
(a1
.to_cstring
, args
[2].to_i
))
1022 else if pname
== "io_read" then
1023 var a1
= args
[1].val
.as(Buffer)
1024 var ns
= new NativeString(a1
.length
)
1025 var len
= recvval
.as(PrimitiveNativeFile).io_read
(ns
, args
[2].to_i
)
1027 a1
.append
(ns
.to_s_with_length
(len
))
1028 return v
.int_instance
(len
)
1029 else if pname
== "flush" then
1030 recvval
.as(PrimitiveNativeFile).flush
1032 else if pname
== "io_close" then
1033 return v
.int_instance
(recvval
.as(PrimitiveNativeFile).io_close
)
1035 else if pname
== "calloc_array" then
1036 var recvtype
= args
.first
.mtype
.as(MClassType)
1038 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1039 mtype
= mtype
.arguments
.first
1040 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1041 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1042 v
.init_instance_primitive
(instance
)
1044 else if pname
== "native_argc" then
1045 return v
.int_instance
(v
.arguments
.length
)
1046 else if pname
== "native_argv" then
1047 var txt
= v
.arguments
[args
[1].to_i
]
1048 return v
.native_string_instance
(txt
)
1049 else if pname
== "native_argc" then
1050 return v
.int_instance
(v
.arguments
.length
)
1051 else if pname
== "native_argv" then
1052 var txt
= v
.arguments
[args
[1].to_i
]
1053 return v
.native_string_instance
(txt
)
1054 else if pname
== "get_time" then
1055 return v
.int_instance
(get_time
)
1056 else if pname
== "srand" then
1059 else if pname
== "srand_from" then
1060 srand_from
(args
[1].to_i
)
1062 else if pname
== "atan2" then
1063 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1064 else if pname
== "pi" then
1065 return v
.float_instance
(pi
)
1066 else if pname
== "lexer_goto" then
1067 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1068 else if pname
== "lexer_accept" then
1069 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1070 else if pname
== "parser_goto" then
1071 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1072 else if pname
== "parser_action" then
1073 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1074 else if pname
== "file_getcwd" then
1075 return v
.native_string_instance
(getcwd
)
1076 else if pname
== "errno" then
1077 return v
.int_instance
(sys
.errno
)
1078 else if pname
== "address_is_null" then
1080 if recv
isa PrimitiveInstance[PrimitiveNativeFile] then
1081 return v
.bool_instance
(recv
.val
.address_is_null
)
1083 return v
.false_instance
1085 return v
.error_instance
1089 redef class AbstractArray[E
]
1090 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1092 self.copy_to
(start
, len
, dest
, new_start
)
1096 redef class AAttrPropdef
1097 redef fun call
(v
, mpropdef
, args
)
1099 var recv
= args
.first
1100 assert recv
isa MutableInstance
1101 var attr
= self.mpropdef
.mproperty
1102 if mpropdef
== mreadpropdef
then
1103 assert args
.length
== 1
1104 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1105 return evaluate_expr
(v
, recv
)
1106 else if mpropdef
== mwritepropdef
then
1107 assert args
.length
== 2
1108 v
.write_attribute
(attr
, recv
, args
[1])
1115 # Evaluate and set the default value of the attribute in `recv`
1116 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1118 if is_lazy
then return
1120 evaluate_expr
(v
, recv
)
1123 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1124 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1125 if mtype
isa MNullableType then
1126 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1130 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1132 assert recv
isa MutableInstance
1133 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1138 var nexpr
= self.n_expr
1139 var nblock
= self.n_block
1140 if nexpr
!= null then
1142 else if nblock
!= null then
1144 assert v
.returnmark
== f
1147 v
.escapevalue
= null
1154 assert not v
.is_escaping
1155 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1160 redef class AClassdef
1161 # Execute an implicit `mpropdef` associated with the current node.
1162 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1164 if mpropdef
.mproperty
.is_root_init
then
1165 assert args
.length
== 1
1166 if not mpropdef
.is_intro
then
1167 # standard call-next-method
1168 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1169 v
.call
(superpd
, args
)
1179 # Evaluate the node as a possible expression.
1180 # Return a possible value
1181 # NOTE: Do not call this method directly, but use `v.expr`
1182 # This method is here to be implemented by subclasses.
1183 private fun expr
(v
: NaiveInterpreter): nullable Instance
1185 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1189 # Evaluate the node as a statement.
1190 # NOTE: Do not call this method directly, but use `v.stmt`
1191 # This method is here to be implemented by subclasses (no need to return something).
1192 private fun stmt
(v
: NaiveInterpreter)
1199 redef class ABlockExpr
1202 var last
= self.n_expr
.last
1203 for e
in self.n_expr
do
1204 if e
== last
then break
1206 if v
.is_escaping
then return null
1213 for e
in self.n_expr
do
1215 if v
.is_escaping
then return
1220 redef class AVardeclExpr
1223 var ne
= self.n_expr
1226 if i
== null then return
1227 v
.write_variable
(self.variable
.as(not null), i
)
1232 redef class AVarExpr
1235 return v
.read_variable
(self.variable
.as(not null))
1239 redef class AVarAssignExpr
1242 var i
= v
.expr
(self.n_value
)
1243 if i
== null then return null
1244 v
.write_variable
(self.variable
.as(not null), i
)
1249 redef class AVarReassignExpr
1252 var variable
= self.variable
.as(not null)
1253 var vari
= v
.read_variable
(variable
)
1254 var value
= v
.expr
(self.n_value
)
1255 if value
== null then return
1256 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1258 v
.write_variable
(variable
, res
)
1262 redef class ASelfExpr
1265 return v
.frame
.arguments
.first
1269 redef class AEscapeExpr
1272 var ne
= self.n_expr
1275 if i
== null then return
1278 v
.escapemark
= self.escapemark
1282 redef class AReturnExpr
1285 var ne
= self.n_expr
1288 if i
== null then return
1291 v
.returnmark
= v
.frame
1295 redef class AAbortExpr
1306 var cond
= v
.expr
(self.n_expr
)
1307 if cond
== null then return null
1308 if cond
.is_true
then
1309 return v
.expr
(self.n_then
.as(not null))
1311 return v
.expr
(self.n_else
.as(not null))
1317 var cond
= v
.expr
(self.n_expr
)
1318 if cond
== null then return
1319 if cond
.is_true
then
1327 redef class AIfexprExpr
1330 var cond
= v
.expr
(self.n_expr
)
1331 if cond
== null then return null
1332 if cond
.is_true
then
1333 return v
.expr
(self.n_then
)
1335 return v
.expr
(self.n_else
)
1343 v
.stmt
(self.n_block
)
1344 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1348 redef class AWhileExpr
1352 var cond
= v
.expr
(self.n_expr
)
1353 if cond
== null then return
1354 if not cond
.is_true
then return
1355 v
.stmt
(self.n_block
)
1356 if v
.is_escape
(self.break_mark
) then return
1357 v
.is_escape
(self.continue_mark
) # Clear the break
1358 if v
.is_escaping
then return
1363 redef class ALoopExpr
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 AForExpr
1378 var col
= v
.expr
(self.n_expr
)
1379 if col
== null then return
1380 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1382 #self.debug("col {col}")
1383 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1384 #self.debug("iter {iter}")
1386 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1387 if not isok
.is_true
then break
1388 if self.variables
.length
== 1 then
1389 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1390 #self.debug("item {item}")
1391 v
.write_variable
(self.variables
.first
, item
)
1392 else if self.variables
.length
== 2 then
1393 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1394 v
.write_variable
(self.variables
[0], key
)
1395 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1396 v
.write_variable
(self.variables
[1], item
)
1400 v
.stmt
(self.n_block
)
1401 if v
.is_escape
(self.break_mark
) then break
1402 v
.is_escape
(self.continue_mark
) # Clear the break
1403 if v
.is_escaping
then break
1404 v
.callsite
(method_next
, [iter
])
1406 var method_finish
= self.method_finish
1407 if method_finish
!= null then
1408 v
.callsite
(method_finish
, [iter
])
1413 redef class AAssertExpr
1416 var cond
= v
.expr
(self.n_expr
)
1417 if cond
== null then return
1418 if not cond
.is_true
then
1420 if v
.is_escaping
then return
1423 fatal
(v
, "Assert '{nid.text}' failed")
1425 fatal
(v
, "Assert failed")
1435 var cond
= v
.expr
(self.n_expr
)
1436 if cond
== null then return null
1437 if cond
.is_true
then return cond
1438 return v
.expr
(self.n_expr2
)
1442 redef class AImpliesExpr
1445 var cond
= v
.expr
(self.n_expr
)
1446 if cond
== null then return null
1447 if not cond
.is_true
then return v
.true_instance
1448 return v
.expr
(self.n_expr2
)
1452 redef class AAndExpr
1455 var cond
= v
.expr
(self.n_expr
)
1456 if cond
== null then return null
1457 if not cond
.is_true
then return cond
1458 return v
.expr
(self.n_expr2
)
1462 redef class ANotExpr
1465 var cond
= v
.expr
(self.n_expr
)
1466 if cond
== null then return null
1467 return v
.bool_instance
(not cond
.is_true
)
1471 redef class AOrElseExpr
1474 var i
= v
.expr
(self.n_expr
)
1475 if i
== null then return null
1476 if i
!= v
.null_instance
then return i
1477 return v
.expr
(self.n_expr2
)
1481 redef class AIntExpr
1484 return v
.int_instance
(self.value
.as(not null))
1488 redef class AFloatExpr
1491 return v
.float_instance
(self.value
.as(not null))
1495 redef class ACharExpr
1498 return v
.char_instance
(self.value
.as(not null))
1502 redef class AArrayExpr
1505 var val
= new Array[Instance]
1506 for nexpr
in self.n_exprs
.n_exprs
do
1507 var i
= v
.expr
(nexpr
)
1508 if i
== null then return null
1511 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1512 var elttype
= mtype
.arguments
.first
1513 return v
.array_instance
(val
, elttype
)
1517 redef class AStringFormExpr
1520 var txt
= self.value
.as(not null)
1521 return v
.string_instance
(txt
)
1525 redef class ASuperstringExpr
1528 var array
= new Array[Instance]
1529 for nexpr
in n_exprs
do
1530 var i
= v
.expr
(nexpr
)
1531 if i
== null then return null
1534 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1535 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1541 redef class ACrangeExpr
1544 var e1
= v
.expr
(self.n_expr
)
1545 if e1
== null then return null
1546 var e2
= v
.expr
(self.n_expr2
)
1547 if e2
== null then return null
1548 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1549 var res
= new MutableInstance(mtype
)
1550 v
.init_instance
(res
)
1551 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1556 redef class AOrangeExpr
1559 var e1
= v
.expr
(self.n_expr
)
1560 if e1
== null then return null
1561 var e2
= v
.expr
(self.n_expr2
)
1562 if e2
== null then return null
1563 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1564 var res
= new MutableInstance(mtype
)
1565 v
.init_instance
(res
)
1566 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1571 redef class ATrueExpr
1574 return v
.bool_instance
(true)
1578 redef class AFalseExpr
1581 return v
.bool_instance
(false)
1585 redef class ANullExpr
1588 return v
.null_instance
1592 redef class AIsaExpr
1595 var i
= v
.expr
(self.n_expr
)
1596 if i
== null then return null
1597 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1598 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1602 redef class AAsCastExpr
1605 var i
= v
.expr
(self.n_expr
)
1606 if i
== null then return null
1607 var mtype
= self.mtype
.as(not null)
1608 var amtype
= v
.unanchor_type
(mtype
)
1609 if not v
.is_subtype
(i
.mtype
, amtype
) then
1610 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1616 redef class AAsNotnullExpr
1619 var i
= v
.expr
(self.n_expr
)
1620 if i
== null then return null
1621 if i
.mtype
isa MNullType then
1622 fatal
(v
, "Cast failed")
1628 redef class AParExpr
1631 return v
.expr
(self.n_expr
)
1635 redef class AOnceExpr
1638 if v
.onces
.has_key
(self) then
1639 return v
.onces
[self]
1641 var res
= v
.expr
(self.n_expr
)
1642 if res
== null then return null
1649 redef class ASendExpr
1652 var recv
= v
.expr
(self.n_expr
)
1653 if recv
== null then return null
1654 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1655 if args
== null then return null
1657 var res
= v
.callsite
(callsite
, args
)
1662 redef class ASendReassignFormExpr
1665 var recv
= v
.expr
(self.n_expr
)
1666 if recv
== null then return
1667 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1668 if args
== null then return
1669 var value
= v
.expr
(self.n_value
)
1670 if value
== null then return
1672 var read
= v
.callsite
(callsite
, args
)
1675 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1676 assert write
!= null
1680 v
.callsite
(write_callsite
, args
)
1684 redef class ASuperExpr
1687 var recv
= v
.frame
.arguments
.first
1689 var callsite
= self.callsite
1690 if callsite
!= null then
1691 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1692 if args
== null then return null
1693 # Add additional arguments for the super init call
1694 if args
.length
== 1 then
1695 for i
in [0..callsite
.msignature
.arity
[ do
1696 args
.add
(v
.frame
.arguments
[i
+1])
1700 var res
= v
.callsite
(callsite
, args
)
1704 # standard call-next-method
1705 var mpropdef
= self.mpropdef
1706 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1708 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1709 if args
== null then return null
1711 if args
.length
== 1 then
1712 args
= v
.frame
.arguments
1714 var res
= v
.call
(mpropdef
, args
)
1719 redef class ANewExpr
1722 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1723 var recv
: Instance = new MutableInstance(mtype
)
1724 v
.init_instance
(recv
)
1725 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1726 if args
== null then return null
1727 var res2
= v
.callsite
(callsite
, args
)
1728 if res2
!= null then
1729 #self.debug("got {res2} from {mproperty}. drop {recv}")
1736 redef class AAttrExpr
1739 var recv
= v
.expr
(self.n_expr
)
1740 if recv
== null then return null
1741 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1742 var mproperty
= self.mproperty
.as(not null)
1743 return v
.read_attribute
(mproperty
, recv
)
1747 redef class AAttrAssignExpr
1750 var recv
= v
.expr
(self.n_expr
)
1751 if recv
== null then return
1752 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1753 var i
= v
.expr
(self.n_value
)
1754 if i
== null then return
1755 var mproperty
= self.mproperty
.as(not null)
1756 v
.write_attribute
(mproperty
, recv
, i
)
1760 redef class AAttrReassignExpr
1763 var recv
= v
.expr
(self.n_expr
)
1764 if recv
== null then return
1765 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1766 var value
= v
.expr
(self.n_value
)
1767 if value
== null then return
1768 var mproperty
= self.mproperty
.as(not null)
1769 var attr
= v
.read_attribute
(mproperty
, recv
)
1770 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1772 v
.write_attribute
(mproperty
, recv
, res
)
1776 redef class AIssetAttrExpr
1779 var recv
= v
.expr
(self.n_expr
)
1780 if recv
== null then return null
1781 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1782 var mproperty
= self.mproperty
.as(not null)
1783 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1787 redef class ADebugTypeExpr