1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 private import parser
::tables
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 interpreter
.start
(mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 # The visitor that interprets the Nit Program by walking on the AST
57 class NaiveInterpreter
58 # The modelbuilder that know the AST and its associations with the model
59 var modelbuilder
: ModelBuilder
61 # The main module of the program (used to lookup method)
62 var mainmodule
: MModule
64 # The command line arguments of the interpreted program
65 # arguments.first is the program name
66 # arguments[1] is the first argument
67 var arguments
: Array[String]
69 # The main Sys instance
70 var mainobj
: nullable Instance
72 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
74 self.modelbuilder
= modelbuilder
75 self.mainmodule
= mainmodule
76 self.arguments
= arguments
77 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
78 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
79 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
82 # Starts the interpreter on the main module of a program
83 fun start
(mainmodule
: MModule) do
84 var interpreter
= self
85 var sys_type
= mainmodule
.sys_type
86 if sys_type
== null then return # no class Sys
87 var mainobj
= new MutableInstance(sys_type
)
88 interpreter
.mainobj
= mainobj
89 interpreter
.init_instance
(mainobj
)
90 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
91 if initprop
!= null then
92 interpreter
.send
(initprop
, [mainobj
])
94 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
95 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
96 if mainprop
!= null then
97 interpreter
.send
(mainprop
, [mainobj
])
101 # Subtype test in the context of the mainmodule
102 fun is_subtype
(sub
, sup
: MType): Bool
104 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
107 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
109 assert recv
isa MClassType
110 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
113 # Is a return executed?
114 # Set this mark to skip the evaluation until the end of the specified method frame
115 var returnmark
: nullable Frame = null
117 # Is a break 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
= self.mainmodule
.get_primitive_class
("Int")
196 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
199 # Return the char instance associated with `val`.
200 fun char_instance
(val
: Char): Instance
202 var ic
= self.mainmodule
.get_primitive_class
("Char")
203 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
206 # Return the float instance associated with `val`.
207 fun float_instance
(val
: Float): Instance
209 var ic
= self.mainmodule
.get_primitive_class
("Float")
210 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
213 # The unique instance of the `true` value.
214 var true_instance
: Instance
216 # The unique instance of the `false` value.
217 var false_instance
: Instance
219 # The unique instance of the `null` value.
220 var null_instance
: Instance
222 # Return a new array made of `values`.
223 # The dynamic type of the result is Array[elttype].
224 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
226 assert not elttype
.need_anchor
227 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
228 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
229 var res
= new MutableInstance(mtype
)
230 self.init_instance
(res
)
231 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
235 fun value_instance
(object
: Object): Instance
237 if object
isa Int then
238 return int_instance
(object
)
239 else if object
isa Bool then
240 return bool_instance
(object
)
241 else if object
isa String then
242 return string_instance
(object
)
248 # Return a new native string initialized with `txt`
249 fun native_string_instance
(txt
: String): Instance
251 var val
= new FlatBuffer.from
(txt
)
253 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
254 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
257 # Return a new String instance for `txt`
258 fun string_instance
(txt
: String): Instance
260 var nat
= native_string_instance
(txt
)
261 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
266 # The current frame used to store local variables of the current method executed
267 fun frame
: Frame do return frames
.first
269 # The stack of all frames. The first one is the current one.
270 var frames
= new List[Frame]
272 # Return a stack trace. One line per function
273 fun stack_trace
: String
275 var b
= new FlatBuffer
276 b
.append
(",---- Stack trace -- - - -\n")
278 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
280 b
.append
("`------------------- - - -")
284 # Exit the program with a message
285 fun fatal
(message
: String)
287 if frames
.is_empty
then
290 self.frame
.current_node
.fatal
(self, message
)
295 # Debug on the current node
296 fun debug
(message
: String)
298 if frames
.is_empty
then
301 self.frame
.current_node
.debug
(message
)
305 # Retrieve the value of the variable in the current frame
306 fun read_variable
(v
: Variable): Instance
312 # Assign the value of the variable in the current frame
313 fun write_variable
(v
: Variable, value
: Instance)
319 # Store known methods, used to trace methods as they are reached
320 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
322 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
323 # This method is used to manage varargs in signatures and returns the real array
324 # of instances to use in the call.
325 # Return `null` if one of the evaluation of the arguments return null.
326 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
328 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
329 var res
= new Array[Instance]
332 if args
.is_empty
then return res
334 var vararg_rank
= msignature
.vararg_rank
335 var vararg_len
= args
.length
- msignature
.arity
336 if vararg_len
< 0 then vararg_len
= 0
338 for i
in [0..msignature
.arity
[ do
339 if i
== vararg_rank
then
341 if ne
isa AVarargExpr then
342 var e
= self.expr
(ne
.n_expr
)
343 if e
== null then return null
347 var vararg
= new Array[Instance]
348 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
349 var e
= self.expr
(args
[j
])
350 if e
== null then return null
353 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
354 res
.add
(self.array_instance
(vararg
, elttype
))
357 if i
> vararg_rank
then j
+= vararg_len
358 var e
= self.expr
(args
[j
])
359 if e
== null then return null
366 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
367 # Return a value if `mpropdef` is a function, or null if it is a procedure.
368 # The call is direct/static. There is no message-sending/late-binding.
369 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
371 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
372 self.discover_call_trace
.add mpropdef
373 self.debug
("Discovered {mpropdef}")
375 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
377 # Look for the AST node that implements the property
378 var mproperty
= mpropdef
.mproperty
379 var val
= mpropdef
.constant_value
380 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
381 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
382 self.parameter_check
(npropdef
, mpropdef
, args
)
383 return npropdef
.call
(self, mpropdef
, args
)
384 else if mproperty
.is_root_init
then
385 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
386 self.parameter_check
(nclassdef
, mpropdef
, args
)
387 return nclassdef
.call
(self, mpropdef
, args
)
388 else if val
!= null then
389 return value_instance
(val
)
391 fatal
("Fatal Error: method {mpropdef} not found in the AST")
396 # Generate type checks in the C code to check covariant parameters
397 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
399 var msignature
= mpropdef
.msignature
400 for i
in [0..msignature
.arity
[ do
401 # skip test for vararg since the array is instantiated with the correct polymorphic type
402 if msignature
.vararg_rank
== i
then continue
404 # skip if the cast is not required
405 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
406 if not origmtype
.need_anchor
then continue
408 # get the parameter type
409 var mtype
= msignature
.mparameters
[i
].mtype
410 var anchor
= args
.first
.mtype
.as(MClassType)
411 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
412 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
413 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
418 # Common code for runtime injected calls and normal calls
419 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
421 if mtype
isa MNullType then
422 if mproperty
.name
== "==" then
423 return self.bool_instance
(args
[0] == args
[1])
424 else if mproperty
.name
== "!=" then
425 return self.bool_instance
(args
[0] != args
[1])
427 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
428 fatal
("Receiver is null")
433 # Execute a full `callsite` for given `args`
434 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
435 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
437 var initializers
= callsite
.mpropdef
.initializers
438 if not initializers
.is_empty
then
439 var recv
= arguments
.first
441 for p
in initializers
do
442 if p
isa MMethod then
444 for x
in p
.intro
.msignature
.mparameters
do
445 args
.add arguments
[i
]
449 else if p
isa MAttribute then
450 assert recv
isa MutableInstance
451 recv
.attributes
[p
] = arguments
[i
]
455 assert i
== arguments
.length
457 return send
(callsite
.mproperty
, [recv
])
459 return send
(callsite
.mproperty
, arguments
)
462 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
463 # Return a value if `mproperty` is a function, or null if it is a procedure.
464 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
465 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
467 var recv
= args
.first
468 var mtype
= recv
.mtype
469 var ret
= send_commons
(mproperty
, args
, mtype
)
470 if ret
!= null then return ret
471 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
472 return self.call
(propdef
, args
)
475 # Read the attribute `mproperty` of an instance `recv` and return its value.
476 # If the attribute in not yet initialized, then aborts with an error message.
477 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
479 assert recv
isa MutableInstance
480 if not recv
.attributes
.has_key
(mproperty
) then
481 fatal
("Uninitialized attribute {mproperty.name}")
484 return recv
.attributes
[mproperty
]
487 # Replace in `recv` the value of the attribute `mproperty` by `value`
488 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
490 assert recv
isa MutableInstance
491 recv
.attributes
[mproperty
] = value
494 # Is the attribute `mproperty` initialized the instance `recv`?
495 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
497 assert recv
isa MutableInstance
498 return recv
.attributes
.has_key
(mproperty
)
501 # Collect attributes of a type in the order of their init
502 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
504 var cache
= self.collect_attr_propdef_cache
505 if cache
.has_key
(mtype
) then return cache
[mtype
]
507 var res
= new Array[AAttrPropdef]
508 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
509 self.mainmodule
.linearize_mclassdefs
(cds
)
511 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
512 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
513 for npropdef
in n
.n_propdefs
do
514 if npropdef
isa AAttrPropdef then
524 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
526 # Fill the initial values of the newly created instance `recv`.
527 # `recv.mtype` is used to know what must be filled.
528 fun init_instance
(recv
: Instance)
530 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
531 npropdef
.init_expr
(self, recv
)
535 # This function determine the correct type according the reciever of the current definition (self).
536 fun unanchor_type
(mtype
: MType): MType
538 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
541 # Placebo instance used to mark internal error result when `null` already have a meaning.
542 # TODO: replace with multiple return or something better
543 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
546 # An instance represents a value of the executed program.
547 abstract class Instance
548 # The dynamic type of the instance
549 # ASSERT: not self.mtype.is_anchored
552 # return true if the instance is the true value.
553 # return false if the instance is the true value.
555 fun is_true
: Bool do abort
557 # Return true if `self` IS `o` (using the Nit semantic of is)
558 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
560 # Human readable object identity "Type#number"
561 redef fun to_s
do return "{mtype}"
563 # Return the integer value if the instance is an integer.
565 fun to_i
: Int do abort
567 # Return the integer value if the instance is a float.
569 fun to_f
: Float do abort
571 # The real value encapsulated if the instance is primitive.
573 fun val
: Object do abort
576 # A instance with attribute (standards objects)
577 class MutableInstance
580 # The values of the attributes
581 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
584 # Special instance to handle primitives values (int, bool, etc.)
585 # The trick it just to encapsulate the <<real>> value
586 class PrimitiveInstance[E
: Object]
589 # The real value encapsulated
592 init(mtype
: MType, val
: E
)
600 if val
== true then return true
601 if val
== false then return false
607 if not o
isa PrimitiveInstance[Object] then return false
608 return self.val
== o
.val
613 if not o
isa PrimitiveInstance[Object] then return false
614 return self.val
.is_same_instance
(o
.val
)
617 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
619 redef fun to_i
do return val
.as(Int)
621 redef fun to_f
do return val
.as(Float)
624 # Information about local variables in a running method
626 # The current visited node
627 # The node is stored by frame to keep a stack trace
628 var current_node
: ANode
629 # The executed property.
630 # A Method in case of a call, an attribute in case of a default initialization.
631 var mpropdef
: MPropDef
632 # Arguments of the method (the first is the receiver)
633 var arguments
: Array[Instance]
634 # Mapping between a variable and the current value
635 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
639 # Aborts the program with a message
640 # `v` is used to know if a colored message is displayed or not
641 fun fatal
(v
: NaiveInterpreter, message
: String)
643 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
644 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
646 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
647 sys
.stderr
.write
(v
.stack_trace
)
648 sys
.stderr
.write
("\n")
655 # Execute a `mpropdef` associated with the current node.
656 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
658 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
663 redef class AMethPropdef
666 redef fun call
(v
, mpropdef
, args
)
668 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
669 var res
= call_commons
(v
, mpropdef
, args
, f
)
671 if v
.returnmark
== f
then
680 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
684 for i
in [0..mpropdef
.msignature
.arity
[ do
685 var variable
= self.n_signature
.n_params
[i
].variable
686 assert variable
!= null
687 v
.write_variable
(variable
, arguments
[i
+1])
690 if mpropdef
.is_abstract
then
691 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
695 # Call the implicit super-init
696 var auto_super_inits
= self.auto_super_inits
697 if auto_super_inits
!= null then
698 var args
= [arguments
.first
]
699 for auto_super_init
in auto_super_inits
do
701 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
702 args
.add
(arguments
[i
])
704 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
705 v
.callsite
(auto_super_init
, args
)
708 if auto_super_call
then
709 # standard call-next-method
710 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
711 v
.call
(superpd
, arguments
)
714 if mpropdef
.is_intern
or mpropdef
.is_extern
then
715 var res
= intern_call
(v
, mpropdef
, arguments
)
716 if res
!= v
.error_instance
then return res
719 if n_block
!= null then
724 if mpropdef
.is_intern
then
725 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
726 else if mpropdef
.is_extern
then
727 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
729 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
734 # Interprets a intern or a shortcut extern method.
735 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
736 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
738 var pname
= mpropdef
.mproperty
.name
739 var cname
= mpropdef
.mclassdef
.mclass
.name
740 if pname
== "output" then
741 var recv
= args
.first
744 else if pname
== "object_id" then
745 var recv
= args
.first
746 if recv
isa PrimitiveInstance[Object] then
747 return v
.int_instance
(recv
.val
.object_id
)
749 return v
.int_instance
(recv
.object_id
)
751 else if pname
== "output_class_name" then
752 var recv
= args
.first
755 else if pname
== "native_class_name" then
756 var recv
= args
.first
757 var txt
= recv
.mtype
.to_s
758 return v
.native_string_instance
(txt
)
759 else if pname
== "==" then
760 # == is correctly redefined for instances
761 return v
.bool_instance
(args
[0] == args
[1])
762 else if pname
== "!=" then
763 return v
.bool_instance
(args
[0] != args
[1])
764 else if pname
== "is_same_type" then
765 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
766 else if pname
== "is_same_instance" then
767 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
768 else if pname
== "exit" then
771 else if pname
== "sys" then
773 else if cname
== "Int" then
774 var recvval
= args
[0].to_i
775 if pname
== "unary -" then
776 return v
.int_instance
(-args
[0].to_i
)
777 else if pname
== "+" then
778 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
779 else if pname
== "-" then
780 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
781 else if pname
== "*" then
782 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
783 else if pname
== "%" then
784 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
785 else if pname
== "/" then
786 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
787 else if pname
== "<" then
788 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
789 else if pname
== ">" then
790 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
791 else if pname
== "<=" then
792 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
793 else if pname
== ">=" then
794 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
795 else if pname
== "<=>" then
796 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
797 else if pname
== "ascii" then
798 return v
.char_instance
(args
[0].to_i
.ascii
)
799 else if pname
== "to_f" then
800 return v
.float_instance
(args
[0].to_i
.to_f
)
801 else if pname
== "lshift" then
802 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
803 else if pname
== "rshift" then
804 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
805 else if pname
== "rand" then
806 var res
= recvval
.rand
807 return v
.int_instance
(res
)
808 else if pname
== "bin_and" then
809 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
810 else if pname
== "bin_or" then
811 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
812 else if pname
== "bin_xor" then
813 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
814 else if pname
== "bin_not" then
815 return v
.int_instance
(args
[0].to_i
.bin_not
)
816 else if pname
== "native_int_to_s" then
817 return v
.native_string_instance
(recvval
.to_s
)
818 else if pname
== "strerror_ext" then
819 return v
.native_string_instance
(recvval
.strerror
)
821 else if cname
== "Char" then
822 var recv
= args
[0].val
.as(Char)
823 if pname
== "ascii" then
824 return v
.int_instance
(recv
.ascii
)
825 else if pname
== "successor" then
826 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
827 else if pname
== "predecessor" then
828 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
829 else if pname
== "<" then
830 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
831 else if pname
== ">" then
832 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
833 else if pname
== "<=" then
834 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
835 else if pname
== ">=" then
836 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
837 else if pname
== "<=>" then
838 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
840 else if cname
== "Float" then
841 var recv
= args
[0].to_f
842 if pname
== "unary -" then
843 return v
.float_instance
(-recv
)
844 else if pname
== "+" then
845 return v
.float_instance
(recv
+ args
[1].to_f
)
846 else if pname
== "-" then
847 return v
.float_instance
(recv
- args
[1].to_f
)
848 else if pname
== "*" then
849 return v
.float_instance
(recv
* args
[1].to_f
)
850 else if pname
== "/" then
851 return v
.float_instance
(recv
/ args
[1].to_f
)
852 else if pname
== "<" then
853 return v
.bool_instance
(recv
< args
[1].to_f
)
854 else if pname
== ">" then
855 return v
.bool_instance
(recv
> args
[1].to_f
)
856 else if pname
== "<=" then
857 return v
.bool_instance
(recv
<= args
[1].to_f
)
858 else if pname
== ">=" then
859 return v
.bool_instance
(recv
>= args
[1].to_f
)
860 else if pname
== "to_i" then
861 return v
.int_instance
(recv
.to_i
)
862 else if pname
== "cos" then
863 return v
.float_instance
(args
[0].to_f
.cos
)
864 else if pname
== "sin" then
865 return v
.float_instance
(args
[0].to_f
.sin
)
866 else if pname
== "tan" then
867 return v
.float_instance
(args
[0].to_f
.tan
)
868 else if pname
== "acos" then
869 return v
.float_instance
(args
[0].to_f
.acos
)
870 else if pname
== "asin" then
871 return v
.float_instance
(args
[0].to_f
.asin
)
872 else if pname
== "atan" then
873 return v
.float_instance
(args
[0].to_f
.atan
)
874 else if pname
== "sqrt" then
875 return v
.float_instance
(args
[0].to_f
.sqrt
)
876 else if pname
== "exp" then
877 return v
.float_instance
(args
[0].to_f
.exp
)
878 else if pname
== "log" then
879 return v
.float_instance
(args
[0].to_f
.log
)
880 else if pname
== "pow" then
881 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
882 else if pname
== "rand" then
883 return v
.float_instance
(args
[0].to_f
.rand
)
884 else if pname
== "abs" then
885 return v
.float_instance
(args
[0].to_f
.abs
)
886 else if pname
== "hypot_with" then
887 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
888 else if pname
== "is_nan" then
889 return v
.bool_instance
(args
[0].to_f
.is_nan
)
890 else if pname
== "is_inf_extern" then
891 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
893 else if cname
== "NativeString" then
894 if pname
== "new" then
895 return v
.native_string_instance
("!" * args
[1].to_i
)
897 var recvval
= args
.first
.val
.as(Buffer)
898 if pname
== "[]" then
899 var arg1
= args
[1].to_i
900 if arg1
>= recvval
.length
or arg1
< 0 then
901 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
903 return v
.char_instance
(recvval
.chars
[arg1
])
904 else if pname
== "[]=" then
905 var arg1
= args
[1].to_i
906 if arg1
>= recvval
.length
or arg1
< 0 then
907 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
909 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
911 else if pname
== "copy_to" then
912 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
913 var destval
= args
[1].val
.as(FlatBuffer)
914 var lenval
= args
[2].to_i
915 var fromval
= args
[3].to_i
916 var toval
= args
[4].to_i
918 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
920 if fromval
+ lenval
>= recvval
.length
then
921 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
924 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
926 if toval
+ lenval
>= destval
.length
then
927 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
929 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
931 else if pname
== "atoi" then
932 return v
.int_instance
(recvval
.to_i
)
933 else if pname
== "file_exists" then
934 return v
.bool_instance
(recvval
.to_s
.file_exists
)
935 else if pname
== "file_mkdir" then
938 else if pname
== "file_chdir" then
941 else if pname
== "file_realpath" then
942 return v
.native_string_instance
(recvval
.to_s
.realpath
)
943 else if pname
== "get_environ" then
944 var txt
= recvval
.to_s
.environ
945 return v
.native_string_instance
(txt
)
946 else if pname
== "system" then
947 var res
= sys
.system
(recvval
.to_s
)
948 return v
.int_instance
(res
)
949 else if pname
== "atof" then
950 return v
.float_instance
(recvval
.to_f
)
952 else if pname
== "calloc_string" then
953 return v
.native_string_instance
("!" * args
[1].to_i
)
954 else if cname
== "NativeArray" then
955 if pname
== "new" then
956 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
957 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
959 var recvval
= args
.first
.val
.as(Array[Instance])
960 if pname
== "[]" then
961 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
962 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
964 return recvval
[args
[1].to_i
]
965 else if pname
== "[]=" then
966 recvval
[args
[1].to_i
] = args
[2]
968 else if pname
== "length" then
969 return v
.int_instance
(recvval
.length
)
970 else if pname
== "copy_to" then
971 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
974 else if cname
== "NativeFile" then
975 if pname
== "native_stdout" then
976 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
977 else if pname
== "native_stdin" then
978 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
979 else if pname
== "native_stderr" then
980 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
981 else if pname
== "io_open_read" then
982 var a1
= args
[1].val
.as(Buffer)
983 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
984 else if pname
== "io_open_write" then
985 var a1
= args
[1].val
.as(Buffer)
986 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
988 var recvval
= args
.first
.val
989 if pname
== "io_write" then
990 var a1
= args
[1].val
.as(Buffer)
991 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
993 else if pname
== "io_read" then
994 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
995 var a1
= args
[1].val
.as(Buffer)
996 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
997 return v
.int_instance
(str
.length
)
998 else if pname
== "io_close" then
999 recvval
.as(IOS).close
1000 return v
.int_instance
(0)
1001 else if pname
== "address_is_null" then
1002 return v
.false_instance
1004 else if pname
== "calloc_array" then
1005 var recvtype
= args
.first
.mtype
.as(MClassType)
1007 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
1008 mtype
= mtype
.arguments
.first
1009 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1010 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1011 else if pname
== "native_argc" then
1012 return v
.int_instance
(v
.arguments
.length
)
1013 else if pname
== "native_argv" then
1014 var txt
= v
.arguments
[args
[1].to_i
]
1015 return v
.native_string_instance
(txt
)
1016 else if pname
== "native_argc" then
1017 return v
.int_instance
(v
.arguments
.length
)
1018 else if pname
== "native_argv" then
1019 var txt
= v
.arguments
[args
[1].to_i
]
1020 return v
.native_string_instance
(txt
)
1021 else if pname
== "get_time" then
1022 return v
.int_instance
(get_time
)
1023 else if pname
== "srand_from" then
1024 srand_from
(args
[1].to_i
)
1026 else if pname
== "atan2" then
1027 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1028 else if pname
== "pi" then
1029 return v
.float_instance
(pi
)
1030 else if pname
== "lexer_goto" then
1031 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1032 else if pname
== "lexer_accept" then
1033 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1034 else if pname
== "parser_goto" then
1035 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1036 else if pname
== "parser_action" then
1037 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1038 else if pname
== "file_getcwd" then
1039 return v
.native_string_instance
(getcwd
)
1040 else if pname
== "errno" then
1041 return v
.int_instance
(sys
.errno
)
1042 else if pname
== "address_is_null" then
1043 return v
.false_instance
1045 return v
.error_instance
1049 redef class AbstractArray[E
]
1050 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1052 self.copy_to
(start
, len
, dest
, new_start
)
1056 redef class AAttrPropdef
1057 redef fun call
(v
, mpropdef
, args
)
1059 var recv
= args
.first
1060 assert recv
isa MutableInstance
1061 var attr
= self.mpropdef
.mproperty
1062 if mpropdef
== mreadpropdef
then
1063 assert args
.length
== 1
1064 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1065 return evaluate_expr
(v
, recv
)
1066 else if mpropdef
== mwritepropdef
then
1067 assert args
.length
== 2
1068 v
.write_attribute
(attr
, recv
, args
[1])
1075 # Evaluate and set the default value of the attribute in `recv`
1076 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1078 if is_lazy
then return
1080 evaluate_expr
(v
, recv
)
1083 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1084 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1085 if mtype
isa MNullableType then
1086 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1090 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1092 assert recv
isa MutableInstance
1093 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1098 var nexpr
= self.n_expr
1099 var nblock
= self.n_block
1100 if nexpr
!= null then
1102 else if nblock
!= null then
1104 assert v
.returnmark
== f
1107 v
.escapevalue
= null
1114 assert not v
.is_escaping
1115 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1120 redef class AClassdef
1121 # Execute an implicit `mpropdef` associated with the current node.
1122 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1124 if mpropdef
.mproperty
.is_root_init
then
1125 assert args
.length
== 1
1126 if not mpropdef
.is_intro
then
1127 # standard call-next-method
1128 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1129 v
.call
(superpd
, args
)
1139 # Evaluate the node as a possible expression.
1140 # Return a possible value
1141 # NOTE: Do not call this method directly, but use `v.expr`
1142 # This method is here to be implemented by subclasses.
1143 private fun expr
(v
: NaiveInterpreter): nullable Instance
1145 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1149 # Evaluate the node as a statement.
1150 # NOTE: Do not call this method directly, but use `v.stmt`
1151 # This method is here to be implemented by subclasses (no need to return something).
1152 private fun stmt
(v
: NaiveInterpreter)
1159 redef class ABlockExpr
1162 var last
= self.n_expr
.last
1163 for e
in self.n_expr
do
1164 if e
== last
then break
1166 if v
.is_escaping
then return null
1173 for e
in self.n_expr
do
1175 if v
.is_escaping
then return
1180 redef class AVardeclExpr
1183 var ne
= self.n_expr
1186 if i
== null then return
1187 v
.write_variable
(self.variable
.as(not null), i
)
1192 redef class AVarExpr
1195 return v
.read_variable
(self.variable
.as(not null))
1199 redef class AVarAssignExpr
1202 var i
= v
.expr
(self.n_value
)
1203 if i
== null then return null
1204 v
.write_variable
(self.variable
.as(not null), i
)
1209 redef class AVarReassignExpr
1212 var variable
= self.variable
.as(not null)
1213 var vari
= v
.read_variable
(variable
)
1214 var value
= v
.expr
(self.n_value
)
1215 if value
== null then return
1216 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1218 v
.write_variable
(variable
, res
)
1222 redef class ASelfExpr
1225 return v
.frame
.arguments
.first
1229 redef class AEscapeExpr
1232 var ne
= self.n_expr
1235 if i
== null then return
1238 v
.escapemark
= self.escapemark
1242 redef class AReturnExpr
1245 var ne
= self.n_expr
1248 if i
== null then return
1251 v
.returnmark
= v
.frame
1255 redef class AAbortExpr
1266 var cond
= v
.expr
(self.n_expr
)
1267 if cond
== null then return null
1268 if cond
.is_true
then
1269 return v
.expr
(self.n_then
.as(not null))
1271 return v
.expr
(self.n_else
.as(not null))
1277 var cond
= v
.expr
(self.n_expr
)
1278 if cond
== null then return
1279 if cond
.is_true
then
1287 redef class AIfexprExpr
1290 var cond
= v
.expr
(self.n_expr
)
1291 if cond
== null then return null
1292 if cond
.is_true
then
1293 return v
.expr
(self.n_then
)
1295 return v
.expr
(self.n_else
)
1303 v
.stmt
(self.n_block
)
1304 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1308 redef class AWhileExpr
1312 var cond
= v
.expr
(self.n_expr
)
1313 if cond
== null then return
1314 if not cond
.is_true
then return
1315 v
.stmt
(self.n_block
)
1316 if v
.is_escape
(self.break_mark
) then return
1317 v
.is_escape
(self.continue_mark
) # Clear the break
1318 if v
.is_escaping
then return
1323 redef class ALoopExpr
1327 v
.stmt
(self.n_block
)
1328 if v
.is_escape
(self.break_mark
) then return
1329 v
.is_escape
(self.continue_mark
) # Clear the break
1330 if v
.is_escaping
then return
1335 redef class AForExpr
1338 var col
= v
.expr
(self.n_expr
)
1339 if col
== null then return
1340 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1342 #self.debug("col {col}")
1343 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1344 #self.debug("iter {iter}")
1346 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1347 if not isok
.is_true
then break
1348 if self.variables
.length
== 1 then
1349 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1350 #self.debug("item {item}")
1351 v
.write_variable
(self.variables
.first
, item
)
1352 else if self.variables
.length
== 2 then
1353 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1354 v
.write_variable
(self.variables
[0], key
)
1355 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1356 v
.write_variable
(self.variables
[1], item
)
1360 v
.stmt
(self.n_block
)
1361 if v
.is_escape
(self.break_mark
) then break
1362 v
.is_escape
(self.continue_mark
) # Clear the break
1363 if v
.is_escaping
then break
1364 v
.callsite
(method_next
, [iter
])
1366 var method_finish
= self.method_finish
1367 if method_finish
!= null then
1368 v
.callsite
(method_finish
, [iter
])
1373 redef class AAssertExpr
1376 var cond
= v
.expr
(self.n_expr
)
1377 if cond
== null then return
1378 if not cond
.is_true
then
1380 if v
.is_escaping
then return
1383 fatal
(v
, "Assert '{nid.text}' failed")
1385 fatal
(v
, "Assert failed")
1395 var cond
= v
.expr
(self.n_expr
)
1396 if cond
== null then return null
1397 if cond
.is_true
then return cond
1398 return v
.expr
(self.n_expr2
)
1402 redef class AImpliesExpr
1405 var cond
= v
.expr
(self.n_expr
)
1406 if cond
== null then return null
1407 if not cond
.is_true
then return v
.true_instance
1408 return v
.expr
(self.n_expr2
)
1412 redef class AAndExpr
1415 var cond
= v
.expr
(self.n_expr
)
1416 if cond
== null then return null
1417 if not cond
.is_true
then return cond
1418 return v
.expr
(self.n_expr2
)
1422 redef class ANotExpr
1425 var cond
= v
.expr
(self.n_expr
)
1426 if cond
== null then return null
1427 return v
.bool_instance
(not cond
.is_true
)
1431 redef class AOrElseExpr
1434 var i
= v
.expr
(self.n_expr
)
1435 if i
== null then return null
1436 if i
!= v
.null_instance
then return i
1437 return v
.expr
(self.n_expr2
)
1441 redef class AIntExpr
1444 return v
.int_instance
(self.value
.as(not null))
1448 redef class AFloatExpr
1451 return v
.float_instance
(self.value
.as(not null))
1455 redef class ACharExpr
1458 return v
.char_instance
(self.value
.as(not null))
1462 redef class AArrayExpr
1465 var val
= new Array[Instance]
1466 for nexpr
in self.n_exprs
.n_exprs
do
1467 var i
= v
.expr
(nexpr
)
1468 if i
== null then return null
1471 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1472 var elttype
= mtype
.arguments
.first
1473 return v
.array_instance
(val
, elttype
)
1477 redef class AStringFormExpr
1480 var txt
= self.value
.as(not null)
1481 return v
.string_instance
(txt
)
1485 redef class ASuperstringExpr
1488 var array
= new Array[Instance]
1489 for nexpr
in n_exprs
do
1490 var i
= v
.expr
(nexpr
)
1491 if i
== null then return null
1494 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1495 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1501 redef class ACrangeExpr
1504 var e1
= v
.expr
(self.n_expr
)
1505 if e1
== null then return null
1506 var e2
= v
.expr
(self.n_expr2
)
1507 if e2
== null then return null
1508 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1509 var res
= new MutableInstance(mtype
)
1510 v
.init_instance
(res
)
1511 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1516 redef class AOrangeExpr
1519 var e1
= v
.expr
(self.n_expr
)
1520 if e1
== null then return null
1521 var e2
= v
.expr
(self.n_expr2
)
1522 if e2
== null then return null
1523 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1524 var res
= new MutableInstance(mtype
)
1525 v
.init_instance
(res
)
1526 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1531 redef class ATrueExpr
1534 return v
.bool_instance
(true)
1538 redef class AFalseExpr
1541 return v
.bool_instance
(false)
1545 redef class ANullExpr
1548 return v
.null_instance
1552 redef class AIsaExpr
1555 var i
= v
.expr
(self.n_expr
)
1556 if i
== null then return null
1557 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1558 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1562 redef class AAsCastExpr
1565 var i
= v
.expr
(self.n_expr
)
1566 if i
== null then return null
1567 var mtype
= self.mtype
.as(not null)
1568 var amtype
= v
.unanchor_type
(mtype
)
1569 if not v
.is_subtype
(i
.mtype
, amtype
) then
1570 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1576 redef class AAsNotnullExpr
1579 var i
= v
.expr
(self.n_expr
)
1580 if i
== null then return null
1581 if i
.mtype
isa MNullType then
1582 fatal
(v
, "Cast failed")
1588 redef class AParExpr
1591 return v
.expr
(self.n_expr
)
1595 redef class AOnceExpr
1598 if v
.onces
.has_key
(self) then
1599 return v
.onces
[self]
1601 var res
= v
.expr
(self.n_expr
)
1602 if res
== null then return null
1609 redef class ASendExpr
1612 var recv
= v
.expr
(self.n_expr
)
1613 if recv
== null then return null
1614 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1615 if args
== null then return null
1617 var res
= v
.callsite
(callsite
, args
)
1622 redef class ASendReassignFormExpr
1625 var recv
= v
.expr
(self.n_expr
)
1626 if recv
== null then return
1627 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1628 if args
== null then return
1629 var value
= v
.expr
(self.n_value
)
1630 if value
== null then return
1632 var read
= v
.callsite
(callsite
, args
)
1635 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1636 assert write
!= null
1640 v
.callsite
(write_callsite
, args
)
1644 redef class ASuperExpr
1647 var recv
= v
.frame
.arguments
.first
1649 var callsite
= self.callsite
1650 if callsite
!= null then
1651 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1652 if args
== null then return null
1653 # Add additional arguments for the super init call
1654 if args
.length
== 1 then
1655 for i
in [0..callsite
.msignature
.arity
[ do
1656 args
.add
(v
.frame
.arguments
[i
+1])
1660 var res
= v
.callsite
(callsite
, args
)
1664 # standard call-next-method
1665 var mpropdef
= self.mpropdef
1666 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1668 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1669 if args
== null then return null
1671 if args
.length
== 1 then
1672 args
= v
.frame
.arguments
1674 var res
= v
.call
(mpropdef
, args
)
1679 redef class ANewExpr
1682 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1683 var recv
: Instance = new MutableInstance(mtype
)
1684 v
.init_instance
(recv
)
1685 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1686 if args
== null then return null
1687 var res2
= v
.callsite
(callsite
, args
)
1688 if res2
!= null then
1689 #self.debug("got {res2} from {mproperty}. drop {recv}")
1696 redef class AAttrExpr
1699 var recv
= v
.expr
(self.n_expr
)
1700 if recv
== null then return null
1701 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1702 var mproperty
= self.mproperty
.as(not null)
1703 return v
.read_attribute
(mproperty
, recv
)
1707 redef class AAttrAssignExpr
1710 var recv
= v
.expr
(self.n_expr
)
1711 if recv
== null then return
1712 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1713 var i
= v
.expr
(self.n_value
)
1714 if i
== null then return
1715 var mproperty
= self.mproperty
.as(not null)
1716 v
.write_attribute
(mproperty
, recv
, i
)
1720 redef class AAttrReassignExpr
1723 var recv
= v
.expr
(self.n_expr
)
1724 if recv
== null then return
1725 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1726 var value
= v
.expr
(self.n_value
)
1727 if value
== null then return
1728 var mproperty
= self.mproperty
.as(not null)
1729 var attr
= v
.read_attribute
(mproperty
, recv
)
1730 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1732 v
.write_attribute
(mproperty
, recv
, res
)
1736 redef class AIssetAttrExpr
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
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1747 redef class ADebugTypeExpr