1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 private import parser
::tables
25 redef class ToolContext
26 # --discover-call-trace
27 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
32 self.option_context
.add_option
(self.opt_discover_call_trace
)
36 redef class ModelBuilder
37 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
38 # `arguments` are the command-line arguments in order
40 # 1. the AST is fully loaded.
41 # 2. the model is fully built.
42 # 3. the instructions are fully analysed.
43 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
46 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
48 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
49 interpreter
.start
(mainmodule
)
52 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
56 # The visitor that interprets the Nit Program by walking on the AST
57 class NaiveInterpreter
58 # The modelbuilder that know the AST and its associations with the model
59 var modelbuilder
: ModelBuilder
61 # The main module of the program (used to lookup method)
62 var mainmodule
: MModule
64 # The command line arguments of the interpreted program
65 # arguments.first is the program name
66 # arguments[1] is the first argument
67 var arguments
: Array[String]
69 # The main Sys instance
70 var mainobj
: nullable Instance is noinit
74 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
75 init_instance_primitive
(self.true_instance
)
76 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
77 init_instance_primitive
(self.false_instance
)
78 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
81 # Starts the interpreter on the main module of a program
82 fun start
(mainmodule
: MModule) do
83 var interpreter
= self
84 var sys_type
= mainmodule
.sys_type
85 if sys_type
== null then return # no class Sys
86 var mainobj
= new MutableInstance(sys_type
)
87 interpreter
.mainobj
= mainobj
88 interpreter
.init_instance
(mainobj
)
89 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
90 if initprop
!= null then
91 interpreter
.send
(initprop
, [mainobj
])
93 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
94 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
95 if mainprop
!= null then
96 interpreter
.send
(mainprop
, [mainobj
])
100 # Subtype test in the context of the mainmodule
101 fun is_subtype
(sub
, sup
: MType): Bool
103 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
106 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
108 assert recv
isa MClassType
109 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
112 # Is a return executed?
113 # Set this mark to skip the evaluation until the end of the specified method frame
114 var returnmark
: nullable Frame = null
116 # Is a break or a continue executed?
117 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
118 var escapemark
: nullable EscapeMark = null
120 # Is a return or a break or a continue executed?
121 # Use this function to know if you must skip the evaluation of statements
122 fun is_escaping
: Bool do return returnmark
!= null or escapemark
!= null
124 # The value associated with the current return/break/continue, if any.
125 # Set the value when you set a escapemark.
126 # Read the value when you catch a mark or reach the end of a method
127 var escapevalue
: nullable Instance = null
129 # If there is a break/continue and is associated with `escapemark`, then return true and clear the mark.
130 # If there is no break/continue or if `escapemark` is null then return false.
131 # Use this function to catch a potential break/continue.
132 fun is_escape
(escapemark
: nullable EscapeMark): Bool
134 if escapemark
!= null and self.escapemark
== escapemark
then
135 self.escapemark
= null
142 # Evaluate `n` as an expression in the current context.
143 # Return the value of the expression.
144 # If `n` cannot be evaluated, then aborts.
145 fun expr
(n
: AExpr): nullable Instance
147 var frame
= self.frame
148 var old
= frame
.current_node
149 frame
.current_node
= n
150 #n.debug("IN Execute expr")
152 if i
== null and not self.is_escaping
then
153 n
.debug
("inconsitance: no value and not escaping.")
155 var implicit_cast_to
= n
.implicit_cast_to
156 if implicit_cast_to
!= null then
157 var mtype
= self.unanchor_type
(implicit_cast_to
)
158 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
161 #n.debug("OUT Execute expr: value is {i}")
162 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
163 frame
.current_node
= old
167 # Evaluate `n` as a statement in the current context.
168 # Do nothing if `n` is null.
169 # If `n` cannot be evaluated, then aborts.
170 fun stmt
(n
: nullable AExpr)
173 var frame
= self.frame
174 var old
= frame
.current_node
175 frame
.current_node
= n
176 #n.debug("Execute stmt")
178 frame
.current_node
= old
182 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
183 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
185 # Return the boolean instance associated with `val`.
186 fun bool_instance
(val
: Bool): Instance
188 if val
then return self.true_instance
else return self.false_instance
191 # Return the integer instance associated with `val`.
192 fun int_instance
(val
: Int): Instance
194 var ic
= get_primitive_class
("Int")
195 var instance
= new PrimitiveInstance[Int](ic
.mclass_type
, val
)
196 init_instance_primitive
(instance
)
200 # Return the char instance associated with `val`.
201 fun char_instance
(val
: Char): Instance
203 var ic
= get_primitive_class
("Char")
204 var instance
= new PrimitiveInstance[Char](ic
.mclass_type
, val
)
205 init_instance_primitive
(instance
)
209 # Return the float instance associated with `val`.
210 fun float_instance
(val
: Float): Instance
212 var ic
= get_primitive_class
("Float")
213 var instance
= new PrimitiveInstance[Float](ic
.mclass_type
, val
)
214 init_instance_primitive
(instance
)
218 # The unique instance of the `true` value.
219 var true_instance
: Instance is noinit
221 # The unique instance of the `false` value.
222 var false_instance
: Instance is noinit
224 # The unique instance of the `null` value.
225 var null_instance
: Instance is noinit
227 # Return a new array made of `values`.
228 # The dynamic type of the result is Array[elttype].
229 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
231 assert not elttype
.need_anchor
232 var nat
= new PrimitiveInstance[Array[Instance]](get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
233 init_instance_primitive
(nat
)
234 var mtype
= get_primitive_class
("Array").get_mtype
([elttype
])
235 var res
= new MutableInstance(mtype
)
236 self.init_instance
(res
)
237 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
241 fun value_instance
(object
: Object): Instance
243 if object
isa Int then
244 return int_instance
(object
)
245 else if object
isa Bool then
246 return bool_instance
(object
)
247 else if object
isa String then
248 return string_instance
(object
)
254 # Return a new native string initialized with `txt`
255 fun native_string_instance
(txt
: String): Instance
257 var val
= new FlatBuffer.from
(txt
)
259 var ic
= get_primitive_class
("NativeString")
260 var instance
= new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
261 init_instance_primitive
(instance
)
265 # Return a new String instance for `txt`
266 fun string_instance
(txt
: String): Instance
268 var nat
= native_string_instance
(txt
)
269 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
274 # The current frame used to store local variables of the current method executed
275 fun frame
: Frame do return frames
.first
277 # The stack of all frames. The first one is the current one.
278 var frames
= new List[Frame]
280 # Return a stack trace. One line per function
281 fun stack_trace
: String
283 var b
= new FlatBuffer
284 b
.append
(",---- Stack trace -- - - -\n")
286 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
288 b
.append
("`------------------- - - -")
292 # Exit the program with a message
293 fun fatal
(message
: String)
295 if frames
.is_empty
then
298 self.frame
.current_node
.fatal
(self, message
)
303 # Debug on the current node
304 fun debug
(message
: String)
306 if frames
.is_empty
then
309 self.frame
.current_node
.debug
(message
)
313 # Retrieve the value of the variable in the current frame
314 fun read_variable
(v
: Variable): Instance
320 # Assign the value of the variable in the current frame
321 fun write_variable
(v
: Variable, value
: Instance)
327 # Store known methods, used to trace methods as they are reached
328 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
330 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
331 # This method is used to manage varargs in signatures and returns the real array
332 # of instances to use in the call.
333 # Return `null` if one of the evaluation of the arguments return null.
334 fun varargize
(mpropdef
: MMethodDef, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
336 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
337 var res
= new Array[Instance]
340 if args
.is_empty
then return res
342 var vararg_rank
= msignature
.vararg_rank
343 var vararg_len
= args
.length
- msignature
.arity
344 if vararg_len
< 0 then vararg_len
= 0
346 for i
in [0..msignature
.arity
[ do
347 if i
== vararg_rank
then
349 if ne
isa AVarargExpr then
350 var e
= self.expr
(ne
.n_expr
)
351 if e
== null then return null
355 var vararg
= new Array[Instance]
356 for j
in [vararg_rank
..vararg_rank
+vararg_len
] do
357 var e
= self.expr
(args
[j
])
358 if e
== null then return null
361 var elttype
= msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
362 res
.add
(self.array_instance
(vararg
, elttype
))
365 if i
> vararg_rank
then j
+= vararg_len
366 var e
= self.expr
(args
[j
])
367 if e
== null then return null
374 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
375 # Return a value if `mpropdef` is a function, or null if it is a procedure.
376 # The call is direct/static. There is no message-sending/late-binding.
377 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
379 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
380 self.discover_call_trace
.add mpropdef
381 self.debug
("Discovered {mpropdef}")
383 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
385 # Look for the AST node that implements the property
386 var mproperty
= mpropdef
.mproperty
387 var val
= mpropdef
.constant_value
388 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
389 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
390 self.parameter_check
(npropdef
, mpropdef
, args
)
391 return npropdef
.call
(self, mpropdef
, args
)
392 else if mproperty
.is_root_init
then
393 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
394 self.parameter_check
(nclassdef
, mpropdef
, args
)
395 return nclassdef
.call
(self, mpropdef
, args
)
396 else if val
!= null then
397 return value_instance
(val
)
399 fatal
("Fatal Error: method {mpropdef} not found in the AST")
404 # Generate type checks in the C code to check covariant parameters
405 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
407 var msignature
= mpropdef
.msignature
408 for i
in [0..msignature
.arity
[ do
409 # skip test for vararg since the array is instantiated with the correct polymorphic type
410 if msignature
.vararg_rank
== i
then continue
412 # skip if the cast is not required
413 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
414 if not origmtype
.need_anchor
then continue
416 # get the parameter type
417 var mtype
= msignature
.mparameters
[i
].mtype
418 var anchor
= args
.first
.mtype
.as(MClassType)
419 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
420 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
421 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
426 # Common code for runtime injected calls and normal calls
427 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
429 if mtype
isa MNullType then
430 if mproperty
.name
== "==" then
431 return self.bool_instance
(args
[0] == args
[1])
432 else if mproperty
.name
== "!=" then
433 return self.bool_instance
(args
[0] != args
[1])
435 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
436 fatal
("Receiver is null")
441 # Execute a full `callsite` for given `args`
442 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
443 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
445 var initializers
= callsite
.mpropdef
.initializers
446 if not initializers
.is_empty
then
447 var recv
= arguments
.first
449 for p
in initializers
do
450 if p
isa MMethod then
452 for x
in p
.intro
.msignature
.mparameters
do
453 args
.add arguments
[i
]
457 else if p
isa MAttribute then
458 assert recv
isa MutableInstance
459 recv
.attributes
[p
] = arguments
[i
]
463 assert i
== arguments
.length
465 return send
(callsite
.mproperty
, [recv
])
467 return send
(callsite
.mproperty
, arguments
)
470 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
471 # Return a value if `mproperty` is a function, or null if it is a procedure.
472 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
473 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
475 var recv
= args
.first
476 var mtype
= recv
.mtype
477 var ret
= send_commons
(mproperty
, args
, mtype
)
478 if ret
!= null then return ret
479 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
480 return self.call
(propdef
, args
)
483 # Read the attribute `mproperty` of an instance `recv` and return its value.
484 # If the attribute in not yet initialized, then aborts with an error message.
485 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
487 assert recv
isa MutableInstance
488 if not recv
.attributes
.has_key
(mproperty
) then
489 fatal
("Uninitialized attribute {mproperty.name}")
492 return recv
.attributes
[mproperty
]
495 # Replace in `recv` the value of the attribute `mproperty` by `value`
496 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
498 assert recv
isa MutableInstance
499 recv
.attributes
[mproperty
] = value
502 # Is the attribute `mproperty` initialized the instance `recv`?
503 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
505 assert recv
isa MutableInstance
506 return recv
.attributes
.has_key
(mproperty
)
509 # Collect attributes of a type in the order of their init
510 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
512 var cache
= self.collect_attr_propdef_cache
513 if cache
.has_key
(mtype
) then return cache
[mtype
]
515 var res
= new Array[AAttrPropdef]
516 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
517 self.mainmodule
.linearize_mclassdefs
(cds
)
519 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
520 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
521 for npropdef
in n
.n_propdefs
do
522 if npropdef
isa AAttrPropdef then
532 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
534 # Fill the initial values of the newly created instance `recv`.
535 # `recv.mtype` is used to know what must be filled.
536 fun init_instance
(recv
: Instance)
538 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
539 npropdef
.init_expr
(self, recv
)
543 # A hook to initialize a `PrimitiveInstance`
544 fun init_instance_primitive
(recv
: Instance) do end
546 # Return the primitive `MClass` corresponding to the `name` given in parameter
547 # `name` : name of the primitive class
548 fun get_primitive_class
(name
: String): MClass
550 return mainmodule
.get_primitive_class
(name
)
553 # This function determine the correct type according the reciever of the current definition (self).
554 fun unanchor_type
(mtype
: MType): MType
556 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
559 # Placebo instance used to mark internal error result when `null` already have a meaning.
560 # TODO: replace with multiple return or something better
561 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
564 # An instance represents a value of the executed program.
565 abstract class Instance
566 # The dynamic type of the instance
567 # ASSERT: not self.mtype.is_anchored
570 # return true if the instance is the true value.
571 # return false if the instance is the true value.
573 fun is_true
: Bool do abort
575 # Return true if `self` IS `o` (using the Nit semantic of is)
576 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
578 # Human readable object identity "Type#number"
579 redef fun to_s
do return "{mtype}"
581 # Return the integer value if the instance is an integer.
583 fun to_i
: Int do abort
585 # Return the integer value if the instance is a float.
587 fun to_f
: Float do abort
589 # The real value encapsulated if the instance is primitive.
591 fun val
: Object do abort
594 # A instance with attribute (standards objects)
595 class MutableInstance
598 # The values of the attributes
599 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
602 # Special instance to handle primitives values (int, bool, etc.)
603 # The trick it just to encapsulate the <<real>> value
604 class PrimitiveInstance[E
: Object]
607 # The real value encapsulated
612 if val
== true then return true
613 if val
== false then return false
619 if not o
isa PrimitiveInstance[Object] then return false
620 return self.val
== o
.val
625 if not o
isa PrimitiveInstance[Object] then return false
626 return self.val
.is_same_instance
(o
.val
)
629 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
631 redef fun to_i
do return val
.as(Int)
633 redef fun to_f
do return val
.as(Float)
636 # Information about local variables in a running method
638 # The current visited node
639 # The node is stored by frame to keep a stack trace
640 var current_node
: ANode
641 # The executed property.
642 # A Method in case of a call, an attribute in case of a default initialization.
643 var mpropdef
: MPropDef
644 # Arguments of the method (the first is the receiver)
645 var arguments
: Array[Instance]
646 # Mapping between a variable and the current value
647 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
651 # Aborts the program with a message
652 # `v` is used to know if a colored message is displayed or not
653 fun fatal
(v
: NaiveInterpreter, message
: String)
655 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
656 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
658 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
659 sys
.stderr
.write
(v
.stack_trace
)
660 sys
.stderr
.write
("\n")
667 # Execute a `mpropdef` associated with the current node.
668 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
670 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
675 redef class AMethPropdef
678 redef fun call
(v
, mpropdef
, args
)
680 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
681 var res
= call_commons
(v
, mpropdef
, args
, f
)
683 if v
.returnmark
== f
then
692 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
696 for i
in [0..mpropdef
.msignature
.arity
[ do
697 var variable
= self.n_signature
.n_params
[i
].variable
698 assert variable
!= null
699 v
.write_variable
(variable
, arguments
[i
+1])
702 if mpropdef
.is_abstract
then
703 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
707 # Call the implicit super-init
708 var auto_super_inits
= self.auto_super_inits
709 if auto_super_inits
!= null then
710 var args
= [arguments
.first
]
711 for auto_super_init
in auto_super_inits
do
713 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
714 args
.add
(arguments
[i
])
716 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
717 v
.callsite
(auto_super_init
, args
)
720 if auto_super_call
then
721 # standard call-next-method
722 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
723 v
.call
(superpd
, arguments
)
726 if mpropdef
.is_intern
or mpropdef
.is_extern
then
727 var res
= intern_call
(v
, mpropdef
, arguments
)
728 if res
!= v
.error_instance
then return res
731 if n_block
!= null then
736 if mpropdef
.is_intern
then
737 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
738 else if mpropdef
.is_extern
then
739 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
741 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
746 # Interprets a intern or a shortcut extern method.
747 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
748 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
750 var pname
= mpropdef
.mproperty
.name
751 var cname
= mpropdef
.mclassdef
.mclass
.name
752 if pname
== "output" then
753 var recv
= args
.first
756 else if pname
== "object_id" then
757 var recv
= args
.first
758 if recv
isa PrimitiveInstance[Object] then
759 return v
.int_instance
(recv
.val
.object_id
)
761 return v
.int_instance
(recv
.object_id
)
763 else if pname
== "output_class_name" then
764 var recv
= args
.first
767 else if pname
== "native_class_name" then
768 var recv
= args
.first
769 var txt
= recv
.mtype
.to_s
770 return v
.native_string_instance
(txt
)
771 else if pname
== "==" then
772 # == is correctly redefined for instances
773 return v
.bool_instance
(args
[0] == args
[1])
774 else if pname
== "!=" then
775 return v
.bool_instance
(args
[0] != args
[1])
776 else if pname
== "is_same_type" then
777 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
778 else if pname
== "is_same_instance" then
779 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
780 else if pname
== "exit" then
783 else if pname
== "sys" then
785 else if cname
== "Int" then
786 var recvval
= args
[0].to_i
787 if pname
== "unary -" then
788 return v
.int_instance
(-args
[0].to_i
)
789 else if pname
== "+" then
790 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
791 else if pname
== "-" then
792 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
793 else if pname
== "*" then
794 return v
.int_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
== "/" then
798 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
799 else if pname
== "<" then
800 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
801 else if pname
== ">" then
802 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
803 else if pname
== "<=" then
804 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
805 else if pname
== ">=" then
806 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
807 else if pname
== "<=>" then
808 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
809 else if pname
== "ascii" then
810 return v
.char_instance
(args
[0].to_i
.ascii
)
811 else if pname
== "to_f" then
812 return v
.float_instance
(args
[0].to_i
.to_f
)
813 else if pname
== "lshift" then
814 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
815 else if pname
== "rshift" then
816 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
817 else if pname
== "rand" then
818 var res
= recvval
.rand
819 return v
.int_instance
(res
)
820 else if pname
== "bin_and" then
821 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
822 else if pname
== "bin_or" then
823 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
824 else if pname
== "bin_xor" then
825 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
826 else if pname
== "bin_not" then
827 return v
.int_instance
(args
[0].to_i
.bin_not
)
828 else if pname
== "native_int_to_s" then
829 return v
.native_string_instance
(recvval
.to_s
)
830 else if pname
== "strerror_ext" then
831 return v
.native_string_instance
(recvval
.strerror
)
833 else if cname
== "Char" then
834 var recv
= args
[0].val
.as(Char)
835 if pname
== "ascii" then
836 return v
.int_instance
(recv
.ascii
)
837 else if pname
== "successor" then
838 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
839 else if pname
== "predecessor" then
840 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
841 else if pname
== "<" then
842 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
843 else if pname
== ">" then
844 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
845 else if pname
== "<=" then
846 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
847 else if pname
== ">=" then
848 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
849 else if pname
== "<=>" then
850 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
852 else if cname
== "Float" then
853 var recv
= args
[0].to_f
854 if pname
== "unary -" then
855 return v
.float_instance
(-recv
)
856 else if pname
== "+" then
857 return v
.float_instance
(recv
+ args
[1].to_f
)
858 else if pname
== "-" then
859 return v
.float_instance
(recv
- args
[1].to_f
)
860 else if pname
== "*" then
861 return v
.float_instance
(recv
* args
[1].to_f
)
862 else if pname
== "/" then
863 return v
.float_instance
(recv
/ args
[1].to_f
)
864 else if pname
== "<" then
865 return v
.bool_instance
(recv
< args
[1].to_f
)
866 else if pname
== ">" then
867 return v
.bool_instance
(recv
> args
[1].to_f
)
868 else if pname
== "<=" then
869 return v
.bool_instance
(recv
<= args
[1].to_f
)
870 else if pname
== ">=" then
871 return v
.bool_instance
(recv
>= args
[1].to_f
)
872 else if pname
== "to_i" then
873 return v
.int_instance
(recv
.to_i
)
874 else if pname
== "cos" then
875 return v
.float_instance
(args
[0].to_f
.cos
)
876 else if pname
== "sin" then
877 return v
.float_instance
(args
[0].to_f
.sin
)
878 else if pname
== "tan" then
879 return v
.float_instance
(args
[0].to_f
.tan
)
880 else if pname
== "acos" then
881 return v
.float_instance
(args
[0].to_f
.acos
)
882 else if pname
== "asin" then
883 return v
.float_instance
(args
[0].to_f
.asin
)
884 else if pname
== "atan" then
885 return v
.float_instance
(args
[0].to_f
.atan
)
886 else if pname
== "sqrt" then
887 return v
.float_instance
(args
[0].to_f
.sqrt
)
888 else if pname
== "exp" then
889 return v
.float_instance
(args
[0].to_f
.exp
)
890 else if pname
== "log" then
891 return v
.float_instance
(args
[0].to_f
.log
)
892 else if pname
== "pow" then
893 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
894 else if pname
== "rand" then
895 return v
.float_instance
(args
[0].to_f
.rand
)
896 else if pname
== "abs" then
897 return v
.float_instance
(args
[0].to_f
.abs
)
898 else if pname
== "hypot_with" then
899 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
900 else if pname
== "is_nan" then
901 return v
.bool_instance
(args
[0].to_f
.is_nan
)
902 else if pname
== "is_inf_extern" then
903 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
905 else if cname
== "NativeString" then
906 if pname
== "new" then
907 return v
.native_string_instance
("!" * args
[1].to_i
)
909 var recvval
= args
.first
.val
.as(Buffer)
910 if pname
== "[]" then
911 var arg1
= args
[1].to_i
912 if arg1
>= recvval
.length
or arg1
< 0 then
913 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
915 return v
.char_instance
(recvval
.chars
[arg1
])
916 else if pname
== "[]=" then
917 var arg1
= args
[1].to_i
918 if arg1
>= recvval
.length
or arg1
< 0 then
919 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
921 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
923 else if pname
== "copy_to" then
924 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
925 var destval
= args
[1].val
.as(FlatBuffer)
926 var lenval
= args
[2].to_i
927 var fromval
= args
[3].to_i
928 var toval
= args
[4].to_i
930 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
932 if fromval
+ lenval
>= recvval
.length
then
933 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
936 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
938 if toval
+ lenval
>= destval
.length
then
939 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
941 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
943 else if pname
== "atoi" then
944 return v
.int_instance
(recvval
.to_i
)
945 else if pname
== "file_exists" then
946 return v
.bool_instance
(recvval
.to_s
.file_exists
)
947 else if pname
== "file_mkdir" then
950 else if pname
== "file_chdir" then
953 else if pname
== "file_realpath" then
954 return v
.native_string_instance
(recvval
.to_s
.realpath
)
955 else if pname
== "get_environ" then
956 var txt
= recvval
.to_s
.environ
957 return v
.native_string_instance
(txt
)
958 else if pname
== "system" then
959 var res
= sys
.system
(recvval
.to_s
)
960 return v
.int_instance
(res
)
961 else if pname
== "atof" then
962 return v
.float_instance
(recvval
.to_f
)
964 else if pname
== "calloc_string" then
965 return v
.native_string_instance
("!" * args
[1].to_i
)
966 else if cname
== "NativeArray" then
967 if pname
== "new" then
968 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
969 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
970 v
.init_instance_primitive
(instance
)
973 var recvval
= args
.first
.val
.as(Array[Instance])
974 if pname
== "[]" then
975 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
976 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
978 return recvval
[args
[1].to_i
]
979 else if pname
== "[]=" then
980 recvval
[args
[1].to_i
] = args
[2]
982 else if pname
== "length" then
983 return v
.int_instance
(recvval
.length
)
984 else if pname
== "copy_to" then
985 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
988 else if cname
== "NativeFile" then
989 if pname
== "native_stdout" then
990 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
991 v
.init_instance_primitive
(instance
)
993 else if pname
== "native_stdin" then
994 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
995 v
.init_instance_primitive
(instance
)
997 else if pname
== "native_stderr" then
998 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
999 v
.init_instance_primitive
(instance
)
1001 else if pname
== "io_open_read" then
1002 var a1
= args
[1].val
.as(Buffer)
1003 var instance
= new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
1004 v
.init_instance_primitive
(instance
)
1006 else if pname
== "io_open_write" then
1007 var a1
= args
[1].val
.as(Buffer)
1008 var instance
= new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
1009 v
.init_instance_primitive
(instance
)
1012 var recvval
= args
.first
.val
1013 if pname
== "io_write" then
1014 var a1
= args
[1].val
.as(Buffer)
1015 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
1017 else if pname
== "io_read" then
1018 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
1019 var a1
= args
[1].val
.as(Buffer)
1020 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
1021 return v
.int_instance
(str
.length
)
1022 else if pname
== "io_close" then
1023 recvval
.as(IOS).close
1024 return v
.int_instance
(0)
1025 else if pname
== "address_is_null" then
1026 return v
.false_instance
1028 else if pname
== "calloc_array" then
1029 var recvtype
= args
.first
.mtype
.as(MClassType)
1031 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.get_primitive_class
("ArrayCapable"))
1032 mtype
= mtype
.arguments
.first
1033 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1034 var instance
= new PrimitiveInstance[Array[Instance]](v
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1035 v
.init_instance_primitive
(instance
)
1037 else if pname
== "native_argc" then
1038 return v
.int_instance
(v
.arguments
.length
)
1039 else if pname
== "native_argv" then
1040 var txt
= v
.arguments
[args
[1].to_i
]
1041 return v
.native_string_instance
(txt
)
1042 else if pname
== "native_argc" then
1043 return v
.int_instance
(v
.arguments
.length
)
1044 else if pname
== "native_argv" then
1045 var txt
= v
.arguments
[args
[1].to_i
]
1046 return v
.native_string_instance
(txt
)
1047 else if pname
== "get_time" then
1048 return v
.int_instance
(get_time
)
1049 else if pname
== "srand" then
1052 else if pname
== "srand_from" then
1053 srand_from
(args
[1].to_i
)
1055 else if pname
== "atan2" then
1056 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1057 else if pname
== "pi" then
1058 return v
.float_instance
(pi
)
1059 else if pname
== "lexer_goto" then
1060 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1061 else if pname
== "lexer_accept" then
1062 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1063 else if pname
== "parser_goto" then
1064 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1065 else if pname
== "parser_action" then
1066 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1067 else if pname
== "file_getcwd" then
1068 return v
.native_string_instance
(getcwd
)
1069 else if pname
== "errno" then
1070 return v
.int_instance
(sys
.errno
)
1071 else if pname
== "address_is_null" then
1072 return v
.false_instance
1074 return v
.error_instance
1078 redef class AbstractArray[E
]
1079 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1081 self.copy_to
(start
, len
, dest
, new_start
)
1085 redef class AAttrPropdef
1086 redef fun call
(v
, mpropdef
, args
)
1088 var recv
= args
.first
1089 assert recv
isa MutableInstance
1090 var attr
= self.mpropdef
.mproperty
1091 if mpropdef
== mreadpropdef
then
1092 assert args
.length
== 1
1093 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1094 return evaluate_expr
(v
, recv
)
1095 else if mpropdef
== mwritepropdef
then
1096 assert args
.length
== 2
1097 v
.write_attribute
(attr
, recv
, args
[1])
1104 # Evaluate and set the default value of the attribute in `recv`
1105 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1107 if is_lazy
then return
1109 evaluate_expr
(v
, recv
)
1112 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1113 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1114 if mtype
isa MNullableType then
1115 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1119 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1121 assert recv
isa MutableInstance
1122 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1127 var nexpr
= self.n_expr
1128 var nblock
= self.n_block
1129 if nexpr
!= null then
1131 else if nblock
!= null then
1133 assert v
.returnmark
== f
1136 v
.escapevalue
= null
1143 assert not v
.is_escaping
1144 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1149 redef class AClassdef
1150 # Execute an implicit `mpropdef` associated with the current node.
1151 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1153 if mpropdef
.mproperty
.is_root_init
then
1154 assert args
.length
== 1
1155 if not mpropdef
.is_intro
then
1156 # standard call-next-method
1157 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1158 v
.call
(superpd
, args
)
1168 # Evaluate the node as a possible expression.
1169 # Return a possible value
1170 # NOTE: Do not call this method directly, but use `v.expr`
1171 # This method is here to be implemented by subclasses.
1172 private fun expr
(v
: NaiveInterpreter): nullable Instance
1174 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1178 # Evaluate the node as a statement.
1179 # NOTE: Do not call this method directly, but use `v.stmt`
1180 # This method is here to be implemented by subclasses (no need to return something).
1181 private fun stmt
(v
: NaiveInterpreter)
1188 redef class ABlockExpr
1191 var last
= self.n_expr
.last
1192 for e
in self.n_expr
do
1193 if e
== last
then break
1195 if v
.is_escaping
then return null
1202 for e
in self.n_expr
do
1204 if v
.is_escaping
then return
1209 redef class AVardeclExpr
1212 var ne
= self.n_expr
1215 if i
== null then return
1216 v
.write_variable
(self.variable
.as(not null), i
)
1221 redef class AVarExpr
1224 return v
.read_variable
(self.variable
.as(not null))
1228 redef class AVarAssignExpr
1231 var i
= v
.expr
(self.n_value
)
1232 if i
== null then return null
1233 v
.write_variable
(self.variable
.as(not null), i
)
1238 redef class AVarReassignExpr
1241 var variable
= self.variable
.as(not null)
1242 var vari
= v
.read_variable
(variable
)
1243 var value
= v
.expr
(self.n_value
)
1244 if value
== null then return
1245 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1247 v
.write_variable
(variable
, res
)
1251 redef class ASelfExpr
1254 return v
.frame
.arguments
.first
1258 redef class AEscapeExpr
1261 var ne
= self.n_expr
1264 if i
== null then return
1267 v
.escapemark
= self.escapemark
1271 redef class AReturnExpr
1274 var ne
= self.n_expr
1277 if i
== null then return
1280 v
.returnmark
= v
.frame
1284 redef class AAbortExpr
1295 var cond
= v
.expr
(self.n_expr
)
1296 if cond
== null then return null
1297 if cond
.is_true
then
1298 return v
.expr
(self.n_then
.as(not null))
1300 return v
.expr
(self.n_else
.as(not null))
1306 var cond
= v
.expr
(self.n_expr
)
1307 if cond
== null then return
1308 if cond
.is_true
then
1316 redef class AIfexprExpr
1319 var cond
= v
.expr
(self.n_expr
)
1320 if cond
== null then return null
1321 if cond
.is_true
then
1322 return v
.expr
(self.n_then
)
1324 return v
.expr
(self.n_else
)
1332 v
.stmt
(self.n_block
)
1333 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1337 redef class AWhileExpr
1341 var cond
= v
.expr
(self.n_expr
)
1342 if cond
== null then return
1343 if not cond
.is_true
then return
1344 v
.stmt
(self.n_block
)
1345 if v
.is_escape
(self.break_mark
) then return
1346 v
.is_escape
(self.continue_mark
) # Clear the break
1347 if v
.is_escaping
then return
1352 redef class ALoopExpr
1356 v
.stmt
(self.n_block
)
1357 if v
.is_escape
(self.break_mark
) then return
1358 v
.is_escape
(self.continue_mark
) # Clear the break
1359 if v
.is_escaping
then return
1364 redef class AForExpr
1367 var col
= v
.expr
(self.n_expr
)
1368 if col
== null then return
1369 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1371 #self.debug("col {col}")
1372 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1373 #self.debug("iter {iter}")
1375 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1376 if not isok
.is_true
then break
1377 if self.variables
.length
== 1 then
1378 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1379 #self.debug("item {item}")
1380 v
.write_variable
(self.variables
.first
, item
)
1381 else if self.variables
.length
== 2 then
1382 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1383 v
.write_variable
(self.variables
[0], key
)
1384 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1385 v
.write_variable
(self.variables
[1], item
)
1389 v
.stmt
(self.n_block
)
1390 if v
.is_escape
(self.break_mark
) then break
1391 v
.is_escape
(self.continue_mark
) # Clear the break
1392 if v
.is_escaping
then break
1393 v
.callsite
(method_next
, [iter
])
1395 var method_finish
= self.method_finish
1396 if method_finish
!= null then
1397 v
.callsite
(method_finish
, [iter
])
1402 redef class AAssertExpr
1405 var cond
= v
.expr
(self.n_expr
)
1406 if cond
== null then return
1407 if not cond
.is_true
then
1409 if v
.is_escaping
then return
1412 fatal
(v
, "Assert '{nid.text}' failed")
1414 fatal
(v
, "Assert failed")
1424 var cond
= v
.expr
(self.n_expr
)
1425 if cond
== null then return null
1426 if cond
.is_true
then return cond
1427 return v
.expr
(self.n_expr2
)
1431 redef class AImpliesExpr
1434 var cond
= v
.expr
(self.n_expr
)
1435 if cond
== null then return null
1436 if not cond
.is_true
then return v
.true_instance
1437 return v
.expr
(self.n_expr2
)
1441 redef class AAndExpr
1444 var cond
= v
.expr
(self.n_expr
)
1445 if cond
== null then return null
1446 if not cond
.is_true
then return cond
1447 return v
.expr
(self.n_expr2
)
1451 redef class ANotExpr
1454 var cond
= v
.expr
(self.n_expr
)
1455 if cond
== null then return null
1456 return v
.bool_instance
(not cond
.is_true
)
1460 redef class AOrElseExpr
1463 var i
= v
.expr
(self.n_expr
)
1464 if i
== null then return null
1465 if i
!= v
.null_instance
then return i
1466 return v
.expr
(self.n_expr2
)
1470 redef class AIntExpr
1473 return v
.int_instance
(self.value
.as(not null))
1477 redef class AFloatExpr
1480 return v
.float_instance
(self.value
.as(not null))
1484 redef class ACharExpr
1487 return v
.char_instance
(self.value
.as(not null))
1491 redef class AArrayExpr
1494 var val
= new Array[Instance]
1495 for nexpr
in self.n_exprs
.n_exprs
do
1496 var i
= v
.expr
(nexpr
)
1497 if i
== null then return null
1500 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1501 var elttype
= mtype
.arguments
.first
1502 return v
.array_instance
(val
, elttype
)
1506 redef class AStringFormExpr
1509 var txt
= self.value
.as(not null)
1510 return v
.string_instance
(txt
)
1514 redef class ASuperstringExpr
1517 var array
= new Array[Instance]
1518 for nexpr
in n_exprs
do
1519 var i
= v
.expr
(nexpr
)
1520 if i
== null then return null
1523 var i
= v
.array_instance
(array
, v
.get_primitive_class
("Object").mclass_type
)
1524 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1530 redef class ACrangeExpr
1533 var e1
= v
.expr
(self.n_expr
)
1534 if e1
== null then return null
1535 var e2
= v
.expr
(self.n_expr2
)
1536 if e2
== null then return null
1537 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1538 var res
= new MutableInstance(mtype
)
1539 v
.init_instance
(res
)
1540 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1545 redef class AOrangeExpr
1548 var e1
= v
.expr
(self.n_expr
)
1549 if e1
== null then return null
1550 var e2
= v
.expr
(self.n_expr2
)
1551 if e2
== null then return null
1552 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1553 var res
= new MutableInstance(mtype
)
1554 v
.init_instance
(res
)
1555 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1560 redef class ATrueExpr
1563 return v
.bool_instance
(true)
1567 redef class AFalseExpr
1570 return v
.bool_instance
(false)
1574 redef class ANullExpr
1577 return v
.null_instance
1581 redef class AIsaExpr
1584 var i
= v
.expr
(self.n_expr
)
1585 if i
== null then return null
1586 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1587 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1591 redef class AAsCastExpr
1594 var i
= v
.expr
(self.n_expr
)
1595 if i
== null then return null
1596 var mtype
= self.mtype
.as(not null)
1597 var amtype
= v
.unanchor_type
(mtype
)
1598 if not v
.is_subtype
(i
.mtype
, amtype
) then
1599 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1605 redef class AAsNotnullExpr
1608 var i
= v
.expr
(self.n_expr
)
1609 if i
== null then return null
1610 if i
.mtype
isa MNullType then
1611 fatal
(v
, "Cast failed")
1617 redef class AParExpr
1620 return v
.expr
(self.n_expr
)
1624 redef class AOnceExpr
1627 if v
.onces
.has_key
(self) then
1628 return v
.onces
[self]
1630 var res
= v
.expr
(self.n_expr
)
1631 if res
== null then return null
1638 redef class ASendExpr
1641 var recv
= v
.expr
(self.n_expr
)
1642 if recv
== null then return null
1643 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1644 if args
== null then return null
1646 var res
= v
.callsite
(callsite
, args
)
1651 redef class ASendReassignFormExpr
1654 var recv
= v
.expr
(self.n_expr
)
1655 if recv
== null then return
1656 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.raw_arguments
)
1657 if args
== null then return
1658 var value
= v
.expr
(self.n_value
)
1659 if value
== null then return
1661 var read
= v
.callsite
(callsite
, args
)
1664 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1665 assert write
!= null
1669 v
.callsite
(write_callsite
, args
)
1673 redef class ASuperExpr
1676 var recv
= v
.frame
.arguments
.first
1678 var callsite
= self.callsite
1679 if callsite
!= null then
1680 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1681 if args
== null then return null
1682 # Add additional arguments for the super init call
1683 if args
.length
== 1 then
1684 for i
in [0..callsite
.msignature
.arity
[ do
1685 args
.add
(v
.frame
.arguments
[i
+1])
1689 var res
= v
.callsite
(callsite
, args
)
1693 # standard call-next-method
1694 var mpropdef
= self.mpropdef
1695 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1697 var args
= v
.varargize
(mpropdef
, recv
, self.n_args
.n_exprs
)
1698 if args
== null then return null
1700 if args
.length
== 1 then
1701 args
= v
.frame
.arguments
1703 var res
= v
.call
(mpropdef
, args
)
1708 redef class ANewExpr
1711 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1712 var recv
: Instance = new MutableInstance(mtype
)
1713 v
.init_instance
(recv
)
1714 var args
= v
.varargize
(callsite
.mpropdef
, recv
, self.n_args
.n_exprs
)
1715 if args
== null then return null
1716 var res2
= v
.callsite
(callsite
, args
)
1717 if res2
!= null then
1718 #self.debug("got {res2} from {mproperty}. drop {recv}")
1725 redef class AAttrExpr
1728 var recv
= v
.expr
(self.n_expr
)
1729 if recv
== null then return null
1730 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1731 var mproperty
= self.mproperty
.as(not null)
1732 return v
.read_attribute
(mproperty
, recv
)
1736 redef class AAttrAssignExpr
1739 var recv
= v
.expr
(self.n_expr
)
1740 if recv
== null then return
1741 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1742 var i
= v
.expr
(self.n_value
)
1743 if i
== null then return
1744 var mproperty
= self.mproperty
.as(not null)
1745 v
.write_attribute
(mproperty
, recv
, i
)
1749 redef class AAttrReassignExpr
1752 var recv
= v
.expr
(self.n_expr
)
1753 if recv
== null then return
1754 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1755 var value
= v
.expr
(self.n_value
)
1756 if value
== null then return
1757 var mproperty
= self.mproperty
.as(not null)
1758 var attr
= v
.read_attribute
(mproperty
, recv
)
1759 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1761 v
.write_attribute
(mproperty
, recv
, res
)
1765 redef class AIssetAttrExpr
1768 var recv
= v
.expr
(self.n_expr
)
1769 if recv
== null then return null
1770 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1771 var mproperty
= self.mproperty
.as(not null)
1772 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1776 redef class ADebugTypeExpr