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 executed?
118 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
119 var breakmark
: nullable EscapeMark = null
121 # Is a continue executed?
122 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
123 var continuemark
: nullable EscapeMark = null
125 # Is a return or a break or a continue executed?
126 # Use this function to know if you must skip the evaluation of statements
127 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
129 # The value associated with the current return/break/continue, if any.
130 # Set the value when you set a escapemark.
131 # Read the value when you catch a mark or reach the end of a method
132 var escapevalue
: nullable Instance = null
134 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
135 # If there is no break or if `escapemark` is null then return false.
136 # Use this function to catch a potential break.
137 fun is_break
(escapemark
: nullable EscapeMark): Bool
139 if escapemark
!= null and self.breakmark
== escapemark
then
140 self.breakmark
= null
147 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
148 # If there is no continue or if `escapemark` is null then return false.
149 # Use this function to catch a potential continue.
150 fun is_continue
(escapemark
: nullable EscapeMark): Bool
152 if escapemark
!= null and self.continuemark
== escapemark
then
153 self.continuemark
= null
160 # Evaluate `n` as an expression in the current context.
161 # Return the value of the expression.
162 # If `n` cannot be evaluated, then aborts.
163 fun expr
(n
: AExpr): nullable Instance
165 var frame
= self.frame
166 var old
= frame
.current_node
167 frame
.current_node
= n
168 #n.debug("IN Execute expr")
170 if i
== null and not self.is_escaping
then
171 n
.debug
("inconsitance: no value and not escaping.")
173 var implicit_cast_to
= n
.implicit_cast_to
174 if implicit_cast_to
!= null then
175 var mtype
= self.unanchor_type
(implicit_cast_to
)
176 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
179 #n.debug("OUT Execute expr: value is {i}")
180 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
181 frame
.current_node
= old
185 # Evaluate `n` as a statement in the current context.
186 # Do nothing if `n` is null.
187 # If `n` cannot be evaluated, then aborts.
188 fun stmt
(n
: nullable AExpr)
191 var frame
= self.frame
192 var old
= frame
.current_node
193 frame
.current_node
= n
194 #n.debug("Execute stmt")
196 frame
.current_node
= old
200 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
201 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
203 # Return the boolean instance associated with `val`.
204 fun bool_instance
(val
: Bool): Instance
206 if val
then return self.true_instance
else return self.false_instance
209 # Return the integer instance associated with `val`.
210 fun int_instance
(val
: Int): Instance
212 var ic
= self.mainmodule
.get_primitive_class
("Int")
213 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
216 # Return the char instance associated with `val`.
217 fun char_instance
(val
: Char): Instance
219 var ic
= self.mainmodule
.get_primitive_class
("Char")
220 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
223 # Return the float instance associated with `val`.
224 fun float_instance
(val
: Float): Instance
226 var ic
= self.mainmodule
.get_primitive_class
("Float")
227 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
230 # The unique instance of the `true` value.
231 var true_instance
: Instance
233 # The unique instance of the `false` value.
234 var false_instance
: Instance
236 # The unique instance of the `null` value.
237 var null_instance
: Instance
239 # Return a new array made of `values`.
240 # The dynamic type of the result is Array[elttype].
241 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
243 assert not elttype
.need_anchor
244 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
245 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
246 var res
= new MutableInstance(mtype
)
247 self.init_instance
(res
)
248 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
252 fun value_instance
(object
: Object): Instance
254 if object
isa Int then
255 return int_instance
(object
)
256 else if object
isa Bool then
257 return bool_instance
(object
)
258 else if object
isa String then
259 return string_instance
(object
)
265 # Return a new native string initialized with `txt`
266 fun native_string_instance
(txt
: String): Instance
268 var val
= new FlatBuffer.from
(txt
)
270 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
271 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
274 # Return a new String instance for `txt`
275 fun string_instance
(txt
: String): Instance
277 var nat
= native_string_instance
(txt
)
278 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
283 # The current frame used to store local variables of the current method executed
284 fun frame
: Frame do return frames
.first
286 # The stack of all frames. The first one is the current one.
287 var frames
= new List[Frame]
289 # Return a stack trace. One line per function
290 fun stack_trace
: String
292 var b
= new FlatBuffer
293 b
.append
(",---- Stack trace -- - - -\n")
295 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
297 b
.append
("`------------------- - - -")
301 # Exit the program with a message
302 fun fatal
(message
: String)
304 if frames
.is_empty
then
307 self.frame
.current_node
.fatal
(self, message
)
312 # Debug on the current node
313 fun debug
(message
: String)
315 if frames
.is_empty
then
318 self.frame
.current_node
.debug
(message
)
322 # Retrieve the value of the variable in the current frame
323 fun read_variable
(v
: Variable): Instance
329 # Assign the value of the variable in the current frame
330 fun write_variable
(v
: Variable, value
: Instance)
336 # Store known methods, used to trace methods as they are reached
337 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
339 # Common code for calls to injected methods and normal methods
340 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
342 var vararg_rank
= mpropdef
.msignature
.vararg_rank
343 if vararg_rank
>= 0 then
344 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
346 args
= new Array[Instance]
348 args
.add
(rawargs
.first
) # recv
350 for i
in [0..vararg_rank
[ do
351 args
.add
(rawargs
[i
+1])
354 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
355 var vararg
= new Array[Instance]
356 for i
in [vararg_rank
..vararg_lastrank
] do
357 vararg
.add
(rawargs
[i
+1])
359 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
360 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
361 args
.add
(self.array_instance
(vararg
, elttype
))
363 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
364 args
.add
(rawargs
[i
+1])
370 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
371 # Return a value if `mpropdef` is a function, or null if it is a procedure.
372 # The call is direct/static. There is no message-sending/late-binding.
373 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
375 args
= call_commons
(mpropdef
, args
)
376 return call_without_varargs
(mpropdef
, args
)
379 # Common code to call and this function
381 # Call only executes the variadic part, this avoids
382 # double encapsulation of variadic parameters into an Array
383 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
385 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
386 self.discover_call_trace
.add mpropdef
387 self.debug
("Discovered {mpropdef}")
389 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
391 # Look for the AST node that implements the property
392 var mproperty
= mpropdef
.mproperty
393 var val
= mpropdef
.constant_value
394 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
395 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
396 self.parameter_check
(npropdef
, mpropdef
, args
)
397 return npropdef
.call
(self, mpropdef
, args
)
398 else if mproperty
.name
== "init" then
399 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
400 self.parameter_check
(nclassdef
, mpropdef
, args
)
401 return nclassdef
.call
(self, mpropdef
, args
)
402 else if val
!= null then
403 return value_instance
(val
)
405 fatal
("Fatal Error: method {mpropdef} not found in the AST")
410 # Generate type checks in the C code to check covariant parameters
411 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
413 var msignature
= mpropdef
.msignature
414 for i
in [0..msignature
.arity
[ do
415 # skip test for vararg since the array is instantiated with the correct polymorphic type
416 if msignature
.vararg_rank
== i
then continue
418 # skip if the cast is not required
419 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
420 if not origmtype
.need_anchor
then continue
422 # get the parameter type
423 var mtype
= msignature
.mparameters
[i
].mtype
424 var anchor
= args
.first
.mtype
.as(MClassType)
425 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
426 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
427 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
432 # Common code for runtime injected calls and normal calls
433 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
435 if mtype
isa MNullType then
436 if mproperty
.name
== "==" then
437 return self.bool_instance
(args
[0] == args
[1])
438 else if mproperty
.name
== "!=" then
439 return self.bool_instance
(args
[0] != args
[1])
441 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
442 fatal
("Receiver is null")
447 # Execute a full `callsite` for given `args`
448 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
449 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
451 var initializers
= callsite
.mpropdef
.initializers
452 if not initializers
.is_empty
then
453 var recv
= arguments
.first
455 for p
in initializers
do
456 if p
isa MMethod then
458 for x
in p
.intro
.msignature
.mparameters
do
459 args
.add arguments
[i
]
463 else if p
isa MAttribute then
464 assert recv
isa MutableInstance
465 recv
.attributes
[p
] = arguments
[i
]
469 assert i
== arguments
.length
471 return send
(callsite
.mproperty
, [recv
])
473 return send
(callsite
.mproperty
, arguments
)
476 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
477 # Return a value if `mproperty` is a function, or null if it is a procedure.
478 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
479 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
481 var recv
= args
.first
482 var mtype
= recv
.mtype
483 var ret
= send_commons
(mproperty
, args
, mtype
)
484 if ret
!= null then return ret
485 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
486 return self.call
(propdef
, args
)
489 # Read the attribute `mproperty` of an instance `recv` and return its value.
490 # If the attribute in not yet initialized, then aborts with an error message.
491 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
493 assert recv
isa MutableInstance
494 if not recv
.attributes
.has_key
(mproperty
) then
495 fatal
("Uninitialized attribute {mproperty.name}")
498 return recv
.attributes
[mproperty
]
501 # Replace in `recv` the value of the attribute `mproperty` by `value`
502 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
504 assert recv
isa MutableInstance
505 recv
.attributes
[mproperty
] = value
508 # Is the attribute `mproperty` initialized the instance `recv`?
509 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
511 assert recv
isa MutableInstance
512 return recv
.attributes
.has_key
(mproperty
)
515 # Collect attributes of a type in the order of their init
516 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
518 var cache
= self.collect_attr_propdef_cache
519 if cache
.has_key
(mtype
) then return cache
[mtype
]
521 var res
= new Array[AAttrPropdef]
522 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
523 self.mainmodule
.linearize_mclassdefs
(cds
)
525 if not self.modelbuilder
.mclassdef2nclassdef
.has_key
(cd
) then continue
526 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
527 for npropdef
in n
.n_propdefs
do
528 if npropdef
isa AAttrPropdef then
538 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
540 # Fill the initial values of the newly created instance `recv`.
541 # `recv.mtype` is used to know what must be filled.
542 fun init_instance
(recv
: Instance)
544 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
545 npropdef
.init_expr
(self, recv
)
549 # This function determine the correct type according the reciever of the current definition (self).
550 fun unanchor_type
(mtype
: MType): MType
552 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
555 # Placebo instance used to mark internal error result when `null` already have a meaning.
556 # TODO: replace with multiple return or something better
557 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
560 # An instance represents a value of the executed program.
561 abstract class Instance
562 # The dynamic type of the instance
563 # ASSERT: not self.mtype.is_anchored
566 # return true if the instance is the true value.
567 # return false if the instance is the true value.
569 fun is_true
: Bool do abort
571 # Return true if `self` IS `o` (using the Nit semantic of is)
572 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
574 # Human readable object identity "Type#number"
575 redef fun to_s
do return "{mtype}"
577 # Return the integer value if the instance is an integer.
579 fun to_i
: Int do abort
581 # Return the integer value if the instance is a float.
583 fun to_f
: Float do abort
585 # The real value encapsulated if the instance is primitive.
587 fun val
: Object do abort
590 # A instance with attribute (standards objects)
591 class MutableInstance
594 # The values of the attributes
595 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
598 # Special instance to handle primitives values (int, bool, etc.)
599 # The trick it just to encapsulate the <<real>> value
600 class PrimitiveInstance[E
: Object]
603 # The real value encapsulated
606 init(mtype
: MType, val
: E
)
614 if val
== true then return true
615 if val
== false then return false
621 if not o
isa PrimitiveInstance[Object] then return false
622 return self.val
== o
.val
627 if not o
isa PrimitiveInstance[Object] then return false
628 return self.val
.is_same_instance
(o
.val
)
631 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
633 redef fun to_i
do return val
.as(Int)
635 redef fun to_f
do return val
.as(Float)
638 # Information about local variables in a running method
640 # The current visited node
641 # The node is stored by frame to keep a stack trace
642 var current_node
: ANode
643 # The executed property.
644 # A Method in case of a call, an attribute in case of a default initialization.
645 var mpropdef
: MPropDef
646 # Arguments of the method (the first is the receiver)
647 var arguments
: Array[Instance]
648 # Mapping between a variable and the current value
649 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
653 # Aborts the program with a message
654 # `v` is used to know if a colored message is displayed or not
655 fun fatal
(v
: NaiveInterpreter, message
: String)
657 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
658 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
660 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
661 sys
.stderr
.write
(v
.stack_trace
)
662 sys
.stderr
.write
("\n")
669 # Execute a `mpropdef` associated with the current node.
670 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
672 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
677 redef class AMethPropdef
680 redef fun call
(v
, mpropdef
, args
)
682 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
683 var res
= call_commons
(v
, mpropdef
, args
, f
)
685 if v
.returnmark
== f
then
694 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
698 for i
in [0..mpropdef
.msignature
.arity
[ do
699 var variable
= self.n_signature
.n_params
[i
].variable
700 assert variable
!= null
701 v
.write_variable
(variable
, arguments
[i
+1])
704 if mpropdef
.is_abstract
then
705 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
709 # Call the implicit super-init
710 var auto_super_inits
= self.auto_super_inits
711 if auto_super_inits
!= null then
712 var args
= [arguments
.first
]
713 for auto_super_init
in auto_super_inits
do
715 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
716 args
.add
(arguments
[i
])
718 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
719 v
.callsite
(auto_super_init
, args
)
722 if auto_super_call
then
723 # standard call-next-method
724 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
725 v
.call_without_varargs
(superpd
, arguments
)
728 if mpropdef
.is_intern
or mpropdef
.is_extern
then
729 var res
= intern_call
(v
, mpropdef
, arguments
)
730 if res
!= v
.error_instance
then return res
733 if n_block
!= null then
738 if mpropdef
.is_intern
then
739 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
740 else if mpropdef
.is_extern
then
741 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
743 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
748 # Interprets a intern or a shortcut extern method.
749 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
750 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
752 var pname
= mpropdef
.mproperty
.name
753 var cname
= mpropdef
.mclassdef
.mclass
.name
754 if pname
== "output" then
755 var recv
= args
.first
758 else if pname
== "object_id" then
759 var recv
= args
.first
760 if recv
isa PrimitiveInstance[Object] then
761 return v
.int_instance
(recv
.val
.object_id
)
763 return v
.int_instance
(recv
.object_id
)
765 else if pname
== "output_class_name" then
766 var recv
= args
.first
769 else if pname
== "native_class_name" then
770 var recv
= args
.first
771 var txt
= recv
.mtype
.to_s
772 return v
.native_string_instance
(txt
)
773 else if pname
== "==" then
774 # == is correctly redefined for instances
775 return v
.bool_instance
(args
[0] == args
[1])
776 else if pname
== "!=" then
777 return v
.bool_instance
(args
[0] != args
[1])
778 else if pname
== "is_same_type" then
779 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
780 else if pname
== "is_same_instance" then
781 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
782 else if pname
== "exit" then
785 else if pname
== "sys" then
787 else if cname
== "Int" then
788 var recvval
= args
[0].to_i
789 if pname
== "unary -" then
790 return v
.int_instance
(-args
[0].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
.int_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
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
809 else if pname
== "<=>" then
810 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
811 else if pname
== "ascii" then
812 return v
.char_instance
(args
[0].to_i
.ascii
)
813 else if pname
== "to_f" then
814 return v
.float_instance
(args
[0].to_i
.to_f
)
815 else if pname
== "lshift" then
816 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
817 else if pname
== "rshift" then
818 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
819 else if pname
== "rand" then
820 var res
= recvval
.rand
821 return v
.int_instance
(res
)
822 else if pname
== "bin_and" then
823 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
824 else if pname
== "bin_or" then
825 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
826 else if pname
== "bin_xor" then
827 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
828 else if pname
== "bin_not" then
829 return v
.int_instance
(args
[0].to_i
.bin_not
)
830 else if pname
== "native_int_to_s" then
831 return v
.native_string_instance
(recvval
.to_s
)
832 else if pname
== "strerror_ext" then
833 return v
.native_string_instance
(recvval
.strerror
)
835 else if cname
== "Char" then
836 var recv
= args
[0].val
.as(Char)
837 if pname
== "ascii" then
838 return v
.int_instance
(recv
.ascii
)
839 else if pname
== "successor" then
840 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
841 else if pname
== "predecessor" then
842 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
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
.bool_instance
(recv
>= args
[1].val
.as(Char))
851 else if pname
== "<=>" then
852 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
854 else if cname
== "Float" then
855 var recv
= args
[0].to_f
856 if pname
== "unary -" then
857 return v
.float_instance
(-recv
)
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
.float_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
== ">=" then
873 return v
.bool_instance
(recv
>= args
[1].to_f
)
874 else if pname
== "to_i" then
875 return v
.int_instance
(recv
.to_i
)
876 else if pname
== "cos" then
877 return v
.float_instance
(args
[0].to_f
.cos
)
878 else if pname
== "sin" then
879 return v
.float_instance
(args
[0].to_f
.sin
)
880 else if pname
== "tan" then
881 return v
.float_instance
(args
[0].to_f
.tan
)
882 else if pname
== "acos" then
883 return v
.float_instance
(args
[0].to_f
.acos
)
884 else if pname
== "asin" then
885 return v
.float_instance
(args
[0].to_f
.asin
)
886 else if pname
== "atan" then
887 return v
.float_instance
(args
[0].to_f
.atan
)
888 else if pname
== "sqrt" then
889 return v
.float_instance
(args
[0].to_f
.sqrt
)
890 else if pname
== "exp" then
891 return v
.float_instance
(args
[0].to_f
.exp
)
892 else if pname
== "log" then
893 return v
.float_instance
(args
[0].to_f
.log
)
894 else if pname
== "pow" then
895 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
896 else if pname
== "rand" then
897 return v
.float_instance
(args
[0].to_f
.rand
)
898 else if pname
== "abs" then
899 return v
.float_instance
(args
[0].to_f
.abs
)
900 else if pname
== "hypot_with" then
901 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
902 else if pname
== "is_nan" then
903 return v
.bool_instance
(args
[0].to_f
.is_nan
)
904 else if pname
== "is_inf_extern" then
905 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
907 else if cname
== "NativeString" then
908 if pname
== "init" then
909 return v
.native_string_instance
("!" * args
[1].to_i
)
911 var recvval
= args
.first
.val
.as(Buffer)
912 if pname
== "[]" then
913 var arg1
= args
[1].to_i
914 if arg1
>= recvval
.length
or arg1
< 0 then
915 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
917 return v
.char_instance
(recvval
.chars
[arg1
])
918 else if pname
== "[]=" then
919 var arg1
= args
[1].to_i
920 if arg1
>= recvval
.length
or arg1
< 0 then
921 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
923 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
925 else if pname
== "copy_to" then
926 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
927 var destval
= args
[1].val
.as(FlatBuffer)
928 var lenval
= args
[2].to_i
929 var fromval
= args
[3].to_i
930 var toval
= args
[4].to_i
932 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
934 if fromval
+ lenval
>= recvval
.length
then
935 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
938 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
940 if toval
+ lenval
>= destval
.length
then
941 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
943 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
945 else if pname
== "atoi" then
946 return v
.int_instance
(recvval
.to_i
)
947 else if pname
== "file_exists" then
948 return v
.bool_instance
(recvval
.to_s
.file_exists
)
949 else if pname
== "file_mkdir" then
952 else if pname
== "file_chdir" then
955 else if pname
== "file_realpath" then
956 return v
.native_string_instance
(recvval
.to_s
.realpath
)
957 else if pname
== "get_environ" then
958 var txt
= recvval
.to_s
.environ
959 return v
.native_string_instance
(txt
)
960 else if pname
== "system" then
961 var res
= sys
.system
(recvval
.to_s
)
962 return v
.int_instance
(res
)
963 else if pname
== "atof" then
964 return v
.float_instance
(recvval
.to_f
)
966 else if pname
== "calloc_string" then
967 return v
.native_string_instance
("!" * args
[1].to_i
)
968 else if cname
== "NativeArray" then
969 if pname
== "init" then
970 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
971 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
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 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
991 else if pname
== "native_stdin" then
992 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
993 else if pname
== "native_stderr" then
994 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
995 else if pname
== "io_open_read" then
996 var a1
= args
[1].val
.as(Buffer)
997 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
998 else if pname
== "io_open_write" then
999 var a1
= args
[1].val
.as(Buffer)
1000 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
1002 var recvval
= args
.first
.val
1003 if pname
== "io_write" then
1004 var a1
= args
[1].val
.as(Buffer)
1005 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
1007 else if pname
== "io_read" then
1008 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
1009 var a1
= args
[1].val
.as(Buffer)
1010 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
1011 return v
.int_instance
(str
.length
)
1012 else if pname
== "io_close" then
1013 recvval
.as(IOS).close
1014 return v
.int_instance
(0)
1015 else if pname
== "address_is_null" then
1016 return v
.false_instance
1018 else if pname
== "calloc_array" then
1019 var recvtype
= args
.first
.mtype
.as(MClassType)
1021 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
1022 mtype
= mtype
.arguments
.first
1023 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1024 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
1025 else if pname
== "native_argc" then
1026 return v
.int_instance
(v
.arguments
.length
)
1027 else if pname
== "native_argv" then
1028 var txt
= v
.arguments
[args
[1].to_i
]
1029 return v
.native_string_instance
(txt
)
1030 else if pname
== "native_argc" then
1031 return v
.int_instance
(v
.arguments
.length
)
1032 else if pname
== "native_argv" then
1033 var txt
= v
.arguments
[args
[1].to_i
]
1034 return v
.native_string_instance
(txt
)
1035 else if pname
== "get_time" then
1036 return v
.int_instance
(get_time
)
1037 else if pname
== "srand_from" then
1038 srand_from
(args
[1].to_i
)
1040 else if pname
== "atan2" then
1041 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1042 else if pname
== "pi" then
1043 return v
.float_instance
(pi
)
1044 else if pname
== "lexer_goto" then
1045 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1046 else if pname
== "lexer_accept" then
1047 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1048 else if pname
== "parser_goto" then
1049 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1050 else if pname
== "parser_action" then
1051 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1052 else if pname
== "file_getcwd" then
1053 return v
.native_string_instance
(getcwd
)
1054 else if pname
== "errno" then
1055 return v
.int_instance
(sys
.errno
)
1056 else if pname
== "address_is_null" then
1057 return v
.false_instance
1059 return v
.error_instance
1063 redef class AbstractArray[E
]
1064 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1066 self.copy_to
(start
, len
, dest
, new_start
)
1070 redef class AAttrPropdef
1071 redef fun call
(v
, mpropdef
, args
)
1073 var recv
= args
.first
1074 assert recv
isa MutableInstance
1075 var attr
= self.mpropdef
.mproperty
1076 if mpropdef
== mreadpropdef
then
1077 assert args
.length
== 1
1078 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1079 return evaluate_expr
(v
, recv
)
1080 else if mpropdef
== mwritepropdef
then
1081 assert args
.length
== 2
1082 v
.write_attribute
(attr
, recv
, args
[1])
1089 # Evaluate and set the default value of the attribute in `recv`
1090 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1092 if is_lazy
then return
1093 var nexpr
= self.n_expr
1094 if nexpr
!= null then
1095 evaluate_expr
(v
, recv
)
1098 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1099 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1100 if mtype
isa MNullableType then
1101 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1105 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1107 assert recv
isa MutableInstance
1108 var nexpr
= self.n_expr
1109 assert nexpr
!= null
1110 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1112 var val
= v
.expr
(nexpr
)
1115 assert not v
.is_escaping
1116 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1121 redef class AClassdef
1122 # Execute an implicit `mpropdef` associated with the current node.
1123 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1125 if mpropdef
.mproperty
.is_root_init
then
1126 assert args
.length
== 1
1127 if not mpropdef
.is_intro
then
1128 # standard call-next-method
1129 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1130 v
.call_without_varargs
(superpd
, args
)
1140 # Evaluate the node as a possible expression.
1141 # Return a possible value
1142 # NOTE: Do not call this method directly, but use `v.expr`
1143 # This method is here to be implemented by subclasses.
1144 private fun expr
(v
: NaiveInterpreter): nullable Instance
1146 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1150 # Evaluate the node as a statement.
1151 # NOTE: Do not call this method directly, but use `v.stmt`
1152 # This method is here to be implemented by subclasses (no need to return something).
1153 private fun stmt
(v
: NaiveInterpreter)
1160 redef class ABlockExpr
1163 var last
= self.n_expr
.last
1164 for e
in self.n_expr
do
1165 if e
== last
then break
1167 if v
.is_escaping
then return null
1174 for e
in self.n_expr
do
1176 if v
.is_escaping
then return
1181 redef class AVardeclExpr
1184 var ne
= self.n_expr
1187 if i
== null then return
1188 v
.write_variable
(self.variable
.as(not null), i
)
1193 redef class AVarExpr
1196 return v
.read_variable
(self.variable
.as(not null))
1200 redef class AVarAssignExpr
1203 var i
= v
.expr
(self.n_value
)
1204 if i
== null then return null
1205 v
.write_variable
(self.variable
.as(not null), i
)
1210 redef class AVarReassignExpr
1213 var variable
= self.variable
.as(not null)
1214 var vari
= v
.read_variable
(variable
)
1215 var value
= v
.expr
(self.n_value
)
1216 if value
== null then return
1217 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1219 v
.write_variable
(variable
, res
)
1223 redef class ASelfExpr
1226 return v
.frame
.arguments
.first
1230 redef class AContinueExpr
1233 var ne
= self.n_expr
1236 if i
== null then return
1239 v
.continuemark
= self.escapemark
1243 redef class ABreakExpr
1246 var ne
= self.n_expr
1249 if i
== null then return
1252 v
.breakmark
= self.escapemark
1256 redef class AReturnExpr
1259 var ne
= self.n_expr
1262 if i
== null then return
1265 v
.returnmark
= v
.frame
1269 redef class AAbortExpr
1280 var cond
= v
.expr
(self.n_expr
)
1281 if cond
== null then return null
1282 if cond
.is_true
then
1283 return v
.expr
(self.n_then
.as(not null))
1285 return v
.expr
(self.n_else
.as(not null))
1291 var cond
= v
.expr
(self.n_expr
)
1292 if cond
== null then return
1293 if cond
.is_true
then
1301 redef class AIfexprExpr
1304 var cond
= v
.expr
(self.n_expr
)
1305 if cond
== null then return null
1306 if cond
.is_true
then
1307 return v
.expr
(self.n_then
)
1309 return v
.expr
(self.n_else
)
1317 v
.stmt
(self.n_block
)
1318 v
.is_break
(self.escapemark
) # Clear the break (if any)
1322 redef class AWhileExpr
1326 var cond
= v
.expr
(self.n_expr
)
1327 if cond
== null then return
1328 if not cond
.is_true
then return
1329 v
.stmt
(self.n_block
)
1330 if v
.is_break
(self.escapemark
) then return
1331 v
.is_continue
(self.escapemark
) # Clear the break
1332 if v
.is_escaping
then return
1337 redef class ALoopExpr
1341 v
.stmt
(self.n_block
)
1342 if v
.is_break
(self.escapemark
) then return
1343 v
.is_continue
(self.escapemark
) # Clear the break
1344 if v
.is_escaping
then return
1349 redef class AForExpr
1352 var col
= v
.expr
(self.n_expr
)
1353 if col
== null then return
1354 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1356 #self.debug("col {col}")
1357 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1358 #self.debug("iter {iter}")
1360 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1361 if not isok
.is_true
then break
1362 if self.variables
.length
== 1 then
1363 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1364 #self.debug("item {item}")
1365 v
.write_variable
(self.variables
.first
, item
)
1366 else if self.variables
.length
== 2 then
1367 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1368 v
.write_variable
(self.variables
[0], key
)
1369 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1370 v
.write_variable
(self.variables
[1], item
)
1374 v
.stmt
(self.n_block
)
1375 if v
.is_break
(self.escapemark
) then break
1376 v
.is_continue
(self.escapemark
) # Clear the break
1377 if v
.is_escaping
then break
1378 v
.callsite
(method_next
, [iter
])
1380 var method_finish
= self.method_finish
1381 if method_finish
!= null then
1382 v
.callsite
(method_finish
, [iter
])
1387 redef class AAssertExpr
1390 var cond
= v
.expr
(self.n_expr
)
1391 if cond
== null then return
1392 if not cond
.is_true
then
1394 if v
.is_escaping
then return
1397 fatal
(v
, "Assert '{nid.text}' failed")
1399 fatal
(v
, "Assert failed")
1409 var cond
= v
.expr
(self.n_expr
)
1410 if cond
== null then return null
1411 if cond
.is_true
then return cond
1412 return v
.expr
(self.n_expr2
)
1416 redef class AImpliesExpr
1419 var cond
= v
.expr
(self.n_expr
)
1420 if cond
== null then return null
1421 if not cond
.is_true
then return v
.true_instance
1422 return v
.expr
(self.n_expr2
)
1426 redef class AAndExpr
1429 var cond
= v
.expr
(self.n_expr
)
1430 if cond
== null then return null
1431 if not cond
.is_true
then return cond
1432 return v
.expr
(self.n_expr2
)
1436 redef class ANotExpr
1439 var cond
= v
.expr
(self.n_expr
)
1440 if cond
== null then return null
1441 return v
.bool_instance
(not cond
.is_true
)
1445 redef class AOrElseExpr
1448 var i
= v
.expr
(self.n_expr
)
1449 if i
== null then return null
1450 if i
!= v
.null_instance
then return i
1451 return v
.expr
(self.n_expr2
)
1455 redef class AIntExpr
1458 return v
.int_instance
(self.value
.as(not null))
1462 redef class AFloatExpr
1465 return v
.float_instance
(self.value
.as(not null))
1469 redef class ACharExpr
1472 return v
.char_instance
(self.value
.as(not null))
1476 redef class AArrayExpr
1479 var val
= new Array[Instance]
1480 for nexpr
in self.n_exprs
.n_exprs
do
1481 var i
= v
.expr
(nexpr
)
1482 if i
== null then return null
1485 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1486 var elttype
= mtype
.arguments
.first
1487 return v
.array_instance
(val
, elttype
)
1491 redef class AStringFormExpr
1494 var txt
= self.value
.as(not null)
1495 return v
.string_instance
(txt
)
1499 redef class ASuperstringExpr
1502 var array
= new Array[Instance]
1503 for nexpr
in n_exprs
do
1504 var i
= v
.expr
(nexpr
)
1505 if i
== null then return null
1508 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1509 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1515 redef class ACrangeExpr
1518 var e1
= v
.expr
(self.n_expr
)
1519 if e1
== null then return null
1520 var e2
= v
.expr
(self.n_expr2
)
1521 if e2
== null then return null
1522 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1523 var res
= new MutableInstance(mtype
)
1524 v
.init_instance
(res
)
1525 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1530 redef class AOrangeExpr
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 ATrueExpr
1548 return v
.bool_instance
(true)
1552 redef class AFalseExpr
1555 return v
.bool_instance
(false)
1559 redef class ANullExpr
1562 return v
.null_instance
1566 redef class AIsaExpr
1569 var i
= v
.expr
(self.n_expr
)
1570 if i
== null then return null
1571 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1572 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1576 redef class AAsCastExpr
1579 var i
= v
.expr
(self.n_expr
)
1580 if i
== null then return null
1581 var mtype
= self.mtype
.as(not null)
1582 var amtype
= v
.unanchor_type
(mtype
)
1583 if not v
.is_subtype
(i
.mtype
, amtype
) then
1584 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1590 redef class AAsNotnullExpr
1593 var i
= v
.expr
(self.n_expr
)
1594 if i
== null then return null
1595 if i
.mtype
isa MNullType then
1596 fatal
(v
, "Cast failed")
1602 redef class AParExpr
1605 return v
.expr
(self.n_expr
)
1609 redef class AOnceExpr
1612 if v
.onces
.has_key
(self) then
1613 return v
.onces
[self]
1615 var res
= v
.expr
(self.n_expr
)
1616 if res
== null then return null
1623 redef class ASendExpr
1626 var recv
= v
.expr
(self.n_expr
)
1627 if recv
== null then return null
1629 for a
in self.raw_arguments
do
1631 if i
== null then return null
1635 var res
= v
.callsite
(callsite
, args
)
1640 redef class ASendReassignFormExpr
1643 var recv
= v
.expr
(self.n_expr
)
1644 if recv
== null then return
1646 for a
in self.raw_arguments
do
1648 if i
== null then return
1651 var value
= v
.expr
(self.n_value
)
1652 if value
== null then return
1654 var read
= v
.callsite
(callsite
, args
)
1657 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1658 assert write
!= null
1662 v
.callsite
(write_callsite
, args
)
1666 redef class ASuperExpr
1669 var recv
= v
.frame
.arguments
.first
1671 for a
in self.n_args
.n_exprs
do
1673 if i
== null then return null
1677 var callsite
= self.callsite
1678 if callsite
!= null then
1679 # Add additional arguments for the super init call
1680 if args
.length
== 1 then
1681 for i
in [0..callsite
.msignature
.arity
[ do
1682 args
.add
(v
.frame
.arguments
[i
+1])
1686 var res
= v
.callsite
(callsite
, args
)
1690 if args
.length
== 1 then
1691 args
= v
.frame
.arguments
1694 # standard call-next-method
1695 var mpropdef
= self.mpropdef
1696 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1697 var res
= v
.call_without_varargs
(mpropdef
, args
)
1702 redef class ANewExpr
1705 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1706 var recv
: Instance = new MutableInstance(mtype
)
1707 v
.init_instance
(recv
)
1709 for a
in self.n_args
.n_exprs
do
1711 if i
== null then return null
1714 var res2
= v
.callsite
(callsite
, args
)
1715 if res2
!= null then
1716 #self.debug("got {res2} from {mproperty}. drop {recv}")
1723 redef class AAttrExpr
1726 var recv
= v
.expr
(self.n_expr
)
1727 if recv
== null then return null
1728 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1729 var mproperty
= self.mproperty
.as(not null)
1730 return v
.read_attribute
(mproperty
, recv
)
1734 redef class AAttrAssignExpr
1737 var recv
= v
.expr
(self.n_expr
)
1738 if recv
== null then return
1739 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1740 var i
= v
.expr
(self.n_value
)
1741 if i
== null then return
1742 var mproperty
= self.mproperty
.as(not null)
1743 v
.write_attribute
(mproperty
, recv
, i
)
1747 redef class AAttrReassignExpr
1750 var recv
= v
.expr
(self.n_expr
)
1751 if recv
== null then return
1752 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1753 var value
= v
.expr
(self.n_value
)
1754 if value
== null then return
1755 var mproperty
= self.mproperty
.as(not null)
1756 var attr
= v
.read_attribute
(mproperty
, recv
)
1757 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1759 v
.write_attribute
(mproperty
, recv
, res
)
1763 redef class AIssetAttrExpr
1766 var recv
= v
.expr
(self.n_expr
)
1767 if recv
== null then return null
1768 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1769 var mproperty
= self.mproperty
.as(not null)
1770 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1774 redef class ADebugTypeExpr