1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2012 Jean Privat <jean@pryen.org>
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
9 # http://www.apache.org/licenses/LICENSE-2.0
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Interpretation of a Nit program directly on the AST
18 module naive_interpreter
22 private import parser
::tables
24 redef class ToolContext
25 # --discover-call-trace
26 var opt_discover_call_trace
: OptionBool = new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
31 self.option_context
.add_option
(self.opt_discover_call_trace
)
35 redef class ModelBuilder
36 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
37 # `arguments` are the command-line arguments in order
39 # 1. the AST is fully loaded.
40 # 2. the model is fully built.
41 # 3. the instructions are fully analysed.
42 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
45 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
47 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
48 interpreter
.start
(mainmodule
)
51 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
55 # The visitor that interprets the Nit Program by walking on the AST
56 class NaiveInterpreter
57 # The modelbuilder that know the AST and its associations with the model
58 var modelbuilder
: ModelBuilder
60 # The main moduleof the program (used to lookup methoda
61 var mainmodule
: MModule
63 # The command line arguments of the interpreted program
64 # arguments.first is the program name
65 # arguments[1] is the first argument
66 var arguments
: Array[String]
68 var mainobj
: nullable Instance
70 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
72 self.modelbuilder
= modelbuilder
73 self.mainmodule
= mainmodule
74 self.arguments
= arguments
75 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
76 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
77 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
80 # Starts the interpreter on the main module of a program
81 fun start
(mainmodule
: MModule) do
82 var interpreter
= self
83 var sys_type
= mainmodule
.sys_type
84 if sys_type
== null then return # no class Sys
85 var mainobj
= new MutableInstance(sys_type
)
86 interpreter
.mainobj
= mainobj
87 interpreter
.init_instance
(mainobj
)
88 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
89 if initprop
!= null then
90 interpreter
.send
(initprop
, [mainobj
])
92 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
93 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
94 if mainprop
!= null then
95 interpreter
.send
(mainprop
, [mainobj
])
99 # Subtype test in the context of the mainmodule
100 fun is_subtype
(sub
, sup
: MType): Bool
102 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
105 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
107 assert recv
isa MClassType
108 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
111 # Is a return executed?
112 # Set this mark to skip the evaluation until the end of the specified method frame
113 var returnmark
: nullable Frame = null
115 # Is a break executed?
116 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
117 var breakmark
: nullable EscapeMark = null
119 # Is a continue executed?
120 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
121 var continuemark
: nullable EscapeMark = null
123 # Is a return or a break or a continue executed?
124 # Use this function to know if you must skip the evaluation of statements
125 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
127 # The value associated with the current return/break/continue, if any.
128 # Set the value when you set a escapemark.
129 # Read the value when you catch a mark or reach the end of a method
130 var escapevalue
: nullable Instance = null
132 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
133 # If there is no break or if `escapemark` is null then return false.
134 # Use this function to catch a potential break.
135 fun is_break
(escapemark
: nullable EscapeMark): Bool
137 if escapemark
!= null and self.breakmark
== escapemark
then
138 self.breakmark
= null
145 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
146 # If there is no continue or if `escapemark` is null then return false.
147 # Use this function to catch a potential continue.
148 fun is_continue
(escapemark
: nullable EscapeMark): Bool
150 if escapemark
!= null and self.continuemark
== escapemark
then
151 self.continuemark
= null
158 # Evaluate `n` as an expression in the current context.
159 # Return the value of the expression.
160 # If `n` cannot be evaluated, then aborts.
161 fun expr
(n
: AExpr): nullable Instance
163 var frame
= self.frame
164 var old
= frame
.current_node
165 frame
.current_node
= n
166 #n.debug("IN Execute expr")
168 if i
== null and not self.is_escaping
then
169 n
.debug
("inconsitance: no value and not escaping.")
171 var implicit_cast_to
= n
.implicit_cast_to
172 if implicit_cast_to
!= null then
173 var mtype
= self.unanchor_type
(implicit_cast_to
)
174 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
177 #n.debug("OUT Execute expr: value is {i}")
178 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
179 frame
.current_node
= old
183 # Evaluate `n` as a statement in the current context.
184 # Do nothing if `n` is null.
185 # If `n` cannot be evaluated, then aborts.
186 fun stmt
(n
: nullable AExpr)
189 var frame
= self.frame
190 var old
= frame
.current_node
191 frame
.current_node
= n
192 #n.debug("Execute stmt")
194 frame
.current_node
= old
198 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
199 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
201 # Return the boolean instance associated with `val`.
202 fun bool_instance
(val
: Bool): Instance
204 if val
then return self.true_instance
else return self.false_instance
207 # Return the integer instance associated with `val`.
208 fun int_instance
(val
: Int): Instance
210 var ic
= self.mainmodule
.get_primitive_class
("Int")
211 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
214 # Return the char instance associated with `val`.
215 fun char_instance
(val
: Char): Instance
217 var ic
= self.mainmodule
.get_primitive_class
("Char")
218 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
221 # Return the float instance associated with `val`.
222 fun float_instance
(val
: Float): Instance
224 var ic
= self.mainmodule
.get_primitive_class
("Float")
225 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
228 # The unique intance of the `true` value.
229 var true_instance
: Instance
231 # The unique intance of the `false` value.
232 var false_instance
: Instance
234 # The unique intance of the `null` value.
235 var null_instance
: Instance
237 # Return a new array made of `values`.
238 # The dynamic type of the result is Array[elttype].
239 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
241 assert not elttype
.need_anchor
242 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
243 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
244 var res
= new MutableInstance(mtype
)
245 self.init_instance
(res
)
246 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
250 # Return a new native string initialized with `txt`
251 fun native_string_instance
(txt
: String): Instance
253 var val
= new FlatBuffer.from
(txt
)
255 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
256 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
259 # The current frame used to store local variables of the current method executed
260 fun frame
: Frame do return frames
.first
262 # The stack of all frames. The first one is the current one.
263 var frames
: List[Frame] = new List[Frame]
265 # Return a stack stace. One line per function
266 fun stack_trace
: String
268 var b
= new FlatBuffer
269 b
.append
(",---- Stack trace -- - - -\n")
271 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
273 b
.append
("`------------------- - - -")
277 # Exit the program with a message
278 fun fatal
(message
: String)
280 if frames
.is_empty
then
283 self.frame
.current_node
.fatal
(self, message
)
288 # Debug on the current node
289 fun debug
(message
: String)
291 if frames
.is_empty
then
294 self.frame
.current_node
.debug
(message
)
298 # Retrieve the value of the variable in the current frame
299 fun read_variable
(v
: Variable): Instance
305 # Assign the value of the variable in the current frame
306 fun write_variable
(v
: Variable, value
: Instance)
312 # Store known method, used to trace methods as thez are reached
313 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
315 # Common code for calls to injected methods and normal methods
316 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
318 var vararg_rank
= mpropdef
.msignature
.vararg_rank
319 if vararg_rank
>= 0 then
320 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
322 args
= new Array[Instance]
324 args
.add
(rawargs
.first
) # recv
326 for i
in [0..vararg_rank
[ do
327 args
.add
(rawargs
[i
+1])
330 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
331 var vararg
= new Array[Instance]
332 for i
in [vararg_rank
..vararg_lastrank
] do
333 vararg
.add
(rawargs
[i
+1])
335 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
336 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
337 args
.add
(self.array_instance
(vararg
, elttype
))
339 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
340 args
.add
(rawargs
[i
+1])
346 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
347 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
348 # The call is direct/static. There is no message-seding/late-binding.
349 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
351 args
= call_commons
(mpropdef
, args
)
352 return call_without_varargs
(mpropdef
, args
)
355 # Common code to call and this function
357 # Call only executes the variadic part, this avoids
358 # double encapsulation of variadic parameters into an Array
359 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
361 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
362 self.discover_call_trace
.add mpropdef
363 self.debug
("Discovered {mpropdef}")
365 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
367 # Look for the AST node that implements the property
368 var mproperty
= mpropdef
.mproperty
369 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
370 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
371 self.parameter_check
(npropdef
, mpropdef
, args
)
372 return npropdef
.call
(self, mpropdef
, args
)
373 else if mproperty
.name
== "init" then
374 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
375 self.parameter_check
(nclassdef
, mpropdef
, args
)
376 return nclassdef
.call
(self, mpropdef
, args
)
378 fatal
("Fatal Error: method {mpropdef} not found in the AST")
383 # Generate type checks in the C code to check covariant parameters
384 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
386 var msignature
= mpropdef
.msignature
387 for i
in [0..msignature
.arity
[ do
388 # skip test for vararg since the array is instantiated with the correct polymorphic type
389 if msignature
.vararg_rank
== i
then continue
391 # skip if the cast is not required
392 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
393 if not origmtype
.need_anchor
then continue
395 # get the parameter type
396 var mtype
= msignature
.mparameters
[i
].mtype
397 var anchor
= args
.first
.mtype
.as(MClassType)
398 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
399 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
400 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
405 # Common code for runtime injected calls and normal calls
406 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
408 if mtype
isa MNullType then
409 if mproperty
.name
== "==" then
410 return self.bool_instance
(args
[0] == args
[1])
411 else if mproperty
.name
== "!=" then
412 return self.bool_instance
(args
[0] != args
[1])
414 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
415 fatal
("Receiver is null")
420 # Execute a full `callsite` for given `args`
421 # Use this method, instead of `send` to execute and control the aditionnal behavior of the call-sites
422 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
424 var initializers
= callsite
.mpropdef
.initializers
425 if not initializers
.is_empty
then
426 var recv
= arguments
.first
428 for p
in initializers
do
429 if p
isa MMethod then
431 for x
in p
.intro
.msignature
.mparameters
do
432 args
.add arguments
[i
]
436 else if p
isa MAttribute then
437 assert recv
isa MutableInstance
438 recv
.attributes
[p
] = arguments
[i
]
442 assert i
== arguments
.length
444 return send
(callsite
.mproperty
, [recv
])
446 return send
(callsite
.mproperty
, arguments
)
449 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
450 # Return a falue if `mproperty` is a function, or null if it is a procedure.
451 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
452 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
454 var recv
= args
.first
455 var mtype
= recv
.mtype
456 var ret
= send_commons
(mproperty
, args
, mtype
)
457 if ret
!= null then return ret
458 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
459 return self.call
(propdef
, args
)
462 # Read the attribute `mproperty` of an instance `recv` and return its value.
463 # If the attribute in not yet initialized, then aborts with an error message.
464 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
466 assert recv
isa MutableInstance
467 if not recv
.attributes
.has_key
(mproperty
) then
468 fatal
("Uninitialized attribute {mproperty.name}")
471 return recv
.attributes
[mproperty
]
474 # Replace in `recv` the value of the attribute `mproperty` by `value`
475 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
477 assert recv
isa MutableInstance
478 recv
.attributes
[mproperty
] = value
481 # Is the attribute `mproperty` initialized the instance `recv`?
482 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
484 assert recv
isa MutableInstance
485 return recv
.attributes
.has_key
(mproperty
)
488 # Collect attributes of a type in the order of their init
489 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
491 var cache
= self.collect_attr_propdef_cache
492 if cache
.has_key
(mtype
) then return cache
[mtype
]
494 var res
= new Array[AAttrPropdef]
495 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
496 self.mainmodule
.linearize_mclassdefs
(cds
)
498 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
499 for npropdef
in n
.n_propdefs
do
500 if npropdef
isa AAttrPropdef then
510 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
512 # Fill the initial values of the newly created instance `recv`.
513 # `recv.mtype` is used to know what must be filled.
514 fun init_instance
(recv
: Instance)
516 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
517 npropdef
.init_expr
(self, recv
)
521 # This function determine the correct type according the reciever of the current definition (self).
522 fun unanchor_type
(mtype
: MType): MType
524 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
527 # Placebo instance used to mark internal error result when `null` already have a meaning.
528 # TODO: replace with multiple return or something better
529 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
532 # An instance represents a value of the executed program.
533 abstract class Instance
534 # The dynamic type of the instance
535 # ASSERT: not self.mtype.is_anchored
538 # return true if the instance is the true value.
539 # return false if the instance is the true value.
541 fun is_true
: Bool do abort
543 # Return true if `self` IS `o` (using the Nit semantic of is)
544 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
546 # Human readable object identity "Type#number"
547 redef fun to_s
do return "{mtype}"
549 # Return the integer value if the instance is an integer.
551 fun to_i
: Int do abort
553 # Return the integer value if the instance is a float.
555 fun to_f
: Float do abort
557 # The real value encapsulated if the instance is primitive.
559 fun val
: Object do abort
562 # A instance with attribute (standards objects)
563 class MutableInstance
566 # The values of the attributes
567 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
570 # Special instance to handle primitives values (int, bool, etc.)
571 # The trick it just to encapsulate the <<real>> value
572 class PrimitiveInstance[E
: Object]
575 # The real value encapsulated
578 init(mtype
: MType, val
: E
)
586 if val
== true then return true
587 if val
== false then return false
593 if not o
isa PrimitiveInstance[Object] then return false
594 return self.val
== o
.val
599 if not o
isa PrimitiveInstance[Object] then return false
600 return self.val
.is_same_instance
(o
.val
)
603 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
605 redef fun to_i
do return val
.as(Int)
607 redef fun to_f
do return val
.as(Float)
610 # Information about local variables in a running method
612 # The current visited node
613 # The node is stored by frame to keep a stack trace
614 var current_node
: ANode
615 # The executed property.
616 # A Method in case of a call, an attribute in case of a default initialization.
617 var mpropdef
: MPropDef
618 # Arguments of the method (the first is the receiver)
619 var arguments
: Array[Instance]
620 # Mapping between a variable and the current value
621 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
625 # Aborts the program with a message
626 # `v` is used to know if a colored message is displayed or not
627 fun fatal
(v
: NaiveInterpreter, message
: String)
629 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
630 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
632 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
633 sys
.stderr
.write
(v
.stack_trace
)
634 sys
.stderr
.write
("\n")
641 # Execute a `mpropdef` associated with the current node.
642 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
644 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
649 redef class AMethPropdef
652 redef fun call
(v
, mpropdef
, args
)
654 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
655 var res
= call_commons
(v
, mpropdef
, args
, f
)
657 if v
.returnmark
== f
then
666 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
670 for i
in [0..mpropdef
.msignature
.arity
[ do
671 var variable
= self.n_signature
.n_params
[i
].variable
672 assert variable
!= null
673 v
.write_variable
(variable
, arguments
[i
+1])
676 if mpropdef
.is_abstract
then
677 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
681 # Call the implicit super-init
682 var auto_super_inits
= self.auto_super_inits
683 if auto_super_inits
!= null then
684 var args
= [arguments
.first
]
685 for auto_super_init
in auto_super_inits
do
687 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
688 args
.add
(arguments
[i
])
690 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
691 v
.callsite
(auto_super_init
, args
)
694 if auto_super_call
then
695 # standard call-next-method
696 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
697 v
.call_without_varargs
(superpd
, arguments
)
700 if mpropdef
.is_intern
or mpropdef
.is_extern
then
701 var res
= intern_call
(v
, mpropdef
, arguments
)
702 if res
!= v
.error_instance
then return res
705 if n_block
!= null then
710 if mpropdef
.is_intern
then
711 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
712 else if mpropdef
.is_extern
then
713 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
715 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
720 # Interprets a intern or a shortcut extern method.
721 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
722 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
724 var pname
= mpropdef
.mproperty
.name
725 var cname
= mpropdef
.mclassdef
.mclass
.name
726 if pname
== "output" then
727 var recv
= args
.first
730 else if pname
== "object_id" then
731 var recv
= args
.first
732 if recv
isa PrimitiveInstance[Object] then
733 return v
.int_instance
(recv
.val
.object_id
)
735 return v
.int_instance
(recv
.object_id
)
737 else if pname
== "output_class_name" then
738 var recv
= args
.first
741 else if pname
== "native_class_name" then
742 var recv
= args
.first
743 var txt
= recv
.mtype
.to_s
744 return v
.native_string_instance
(txt
)
745 else if pname
== "==" then
746 # == is correclt redefined for instances
747 return v
.bool_instance
(args
[0] == args
[1])
748 else if pname
== "!=" then
749 return v
.bool_instance
(args
[0] != args
[1])
750 else if pname
== "is_same_type" then
751 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
752 else if pname
== "is_same_instance" then
753 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
754 else if pname
== "exit" then
757 else if pname
== "sys" then
759 else if cname
== "Int" then
760 var recvval
= args
[0].to_i
761 if pname
== "unary -" then
762 return v
.int_instance
(-args
[0].to_i
)
763 else if pname
== "+" then
764 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
765 else if pname
== "-" then
766 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
767 else if pname
== "*" then
768 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
769 else if pname
== "%" then
770 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
771 else if pname
== "/" then
772 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
773 else if pname
== "<" then
774 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
775 else if pname
== ">" then
776 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
777 else if pname
== "<=" then
778 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
779 else if pname
== ">=" then
780 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
781 else if pname
== "<=>" then
782 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
783 else if pname
== "ascii" then
784 return v
.char_instance
(args
[0].to_i
.ascii
)
785 else if pname
== "to_f" then
786 return v
.float_instance
(args
[0].to_i
.to_f
)
787 else if pname
== "lshift" then
788 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
789 else if pname
== "rshift" then
790 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
791 else if pname
== "rand" then
792 var res
= recvval
.rand
793 return v
.int_instance
(res
)
794 else if pname
== "bin_and" then
795 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
796 else if pname
== "bin_or" then
797 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
798 else if pname
== "bin_xor" then
799 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
800 else if pname
== "bin_not" then
801 return v
.int_instance
(args
[0].to_i
.bin_not
)
802 else if pname
== "native_int_to_s" then
803 return v
.native_string_instance
(recvval
.to_s
)
804 else if pname
== "strerror_ext" then
805 return v
.native_string_instance
(recvval
.strerror
)
807 else if cname
== "Char" then
808 var recv
= args
[0].val
.as(Char)
809 if pname
== "ascii" then
810 return v
.int_instance
(recv
.ascii
)
811 else if pname
== "successor" then
812 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
813 else if pname
== "predecessor" then
814 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
815 else if pname
== "<" then
816 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
817 else if pname
== ">" then
818 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
819 else if pname
== "<=" then
820 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
821 else if pname
== ">=" then
822 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
823 else if pname
== "<=>" then
824 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
826 else if cname
== "Float" then
827 var recv
= args
[0].to_f
828 if pname
== "unary -" then
829 return v
.float_instance
(-recv
)
830 else if pname
== "+" then
831 return v
.float_instance
(recv
+ args
[1].to_f
)
832 else if pname
== "-" then
833 return v
.float_instance
(recv
- args
[1].to_f
)
834 else if pname
== "*" then
835 return v
.float_instance
(recv
* args
[1].to_f
)
836 else if pname
== "/" then
837 return v
.float_instance
(recv
/ args
[1].to_f
)
838 else if pname
== "<" then
839 return v
.bool_instance
(recv
< args
[1].to_f
)
840 else if pname
== ">" then
841 return v
.bool_instance
(recv
> args
[1].to_f
)
842 else if pname
== "<=" then
843 return v
.bool_instance
(recv
<= args
[1].to_f
)
844 else if pname
== ">=" then
845 return v
.bool_instance
(recv
>= args
[1].to_f
)
846 else if pname
== "to_i" then
847 return v
.int_instance
(recv
.to_i
)
848 else if pname
== "cos" then
849 return v
.float_instance
(args
[0].to_f
.cos
)
850 else if pname
== "sin" then
851 return v
.float_instance
(args
[0].to_f
.sin
)
852 else if pname
== "tan" then
853 return v
.float_instance
(args
[0].to_f
.tan
)
854 else if pname
== "acos" then
855 return v
.float_instance
(args
[0].to_f
.acos
)
856 else if pname
== "asin" then
857 return v
.float_instance
(args
[0].to_f
.asin
)
858 else if pname
== "atan" then
859 return v
.float_instance
(args
[0].to_f
.atan
)
860 else if pname
== "sqrt" then
861 return v
.float_instance
(args
[0].to_f
.sqrt
)
862 else if pname
== "exp" then
863 return v
.float_instance
(args
[0].to_f
.exp
)
864 else if pname
== "log" then
865 return v
.float_instance
(args
[0].to_f
.log
)
866 else if pname
== "pow" then
867 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
868 else if pname
== "rand" then
869 return v
.float_instance
(args
[0].to_f
.rand
)
870 else if pname
== "abs" then
871 return v
.float_instance
(args
[0].to_f
.abs
)
872 else if pname
== "hypot_with" then
873 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
874 else if pname
== "is_nan" then
875 return v
.bool_instance
(args
[0].to_f
.is_nan
)
876 else if pname
== "is_inf_extern" then
877 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
879 else if cname
== "NativeString" then
880 if pname
== "init" then
881 return v
.native_string_instance
("!" * args
[1].to_i
)
883 var recvval
= args
.first
.val
.as(Buffer)
884 if pname
== "[]" then
885 var arg1
= args
[1].to_i
886 if arg1
>= recvval
.length
or arg1
< 0 then
887 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
889 return v
.char_instance
(recvval
.chars
[arg1
])
890 else if pname
== "[]=" then
891 var arg1
= args
[1].to_i
892 if arg1
>= recvval
.length
or arg1
< 0 then
893 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
895 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
897 else if pname
== "copy_to" then
898 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
899 var destval
= args
[1].val
.as(FlatBuffer)
900 var lenval
= args
[2].to_i
901 var fromval
= args
[3].to_i
902 var toval
= args
[4].to_i
904 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
906 if fromval
+ lenval
>= recvval
.length
then
907 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
910 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
912 if toval
+ lenval
>= destval
.length
then
913 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
915 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
917 else if pname
== "atoi" then
918 return v
.int_instance
(recvval
.to_i
)
919 else if pname
== "file_exists" then
920 return v
.bool_instance
(recvval
.to_s
.file_exists
)
921 else if pname
== "file_mkdir" then
924 else if pname
== "file_chdir" then
927 else if pname
== "file_realpath" then
928 return v
.native_string_instance
(recvval
.to_s
.realpath
)
929 else if pname
== "get_environ" then
930 var txt
= recvval
.to_s
.environ
931 return v
.native_string_instance
(txt
)
932 else if pname
== "system" then
933 var res
= sys
.system
(recvval
.to_s
)
934 return v
.int_instance
(res
)
935 else if pname
== "atof" then
936 return v
.float_instance
(recvval
.to_f
)
938 else if pname
== "calloc_string" then
939 return v
.native_string_instance
("!" * args
[1].to_i
)
940 else if cname
== "NativeArray" then
941 if pname
== "init" then
942 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
943 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
945 var recvval
= args
.first
.val
.as(Array[Instance])
946 if pname
== "[]" then
947 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
948 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
950 return recvval
[args
[1].to_i
]
951 else if pname
== "[]=" then
952 recvval
[args
[1].to_i
] = args
[2]
954 else if pname
== "length" then
955 return v
.int_instance
(recvval
.length
)
956 else if pname
== "copy_to" then
957 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
960 else if cname
== "NativeFile" then
961 if pname
== "native_stdout" then
962 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
963 else if pname
== "native_stdin" then
964 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
965 else if pname
== "native_stderr" then
966 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
967 else if pname
== "io_open_read" then
968 var a1
= args
[1].val
.as(Buffer)
969 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
970 else if pname
== "io_open_write" then
971 var a1
= args
[1].val
.as(Buffer)
972 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
974 var recvval
= args
.first
.val
975 if pname
== "io_write" then
976 var a1
= args
[1].val
.as(Buffer)
977 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
979 else if pname
== "io_read" then
980 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
981 var a1
= args
[1].val
.as(Buffer)
982 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
983 return v
.int_instance
(str
.length
)
984 else if pname
== "io_close" then
985 recvval
.as(IOS).close
986 return v
.int_instance
(0)
987 else if pname
== "address_is_null" then
988 return v
.false_instance
990 else if pname
== "calloc_array" then
991 var recvtype
= args
.first
.mtype
.as(MClassType)
993 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
994 mtype
= mtype
.arguments
.first
995 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
996 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
997 else if pname
== "native_argc" then
998 return v
.int_instance
(v
.arguments
.length
)
999 else if pname
== "native_argv" then
1000 var txt
= v
.arguments
[args
[1].to_i
]
1001 return v
.native_string_instance
(txt
)
1002 else if pname
== "native_argc" then
1003 return v
.int_instance
(v
.arguments
.length
)
1004 else if pname
== "native_argv" then
1005 var txt
= v
.arguments
[args
[1].to_i
]
1006 return v
.native_string_instance
(txt
)
1007 else if pname
== "get_time" then
1008 return v
.int_instance
(get_time
)
1009 else if pname
== "srand_from" then
1010 srand_from
(args
[1].to_i
)
1012 else if pname
== "atan2" then
1013 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
1014 else if pname
== "pi" then
1015 return v
.float_instance
(pi
)
1016 else if pname
== "lexer_goto" then
1017 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1018 else if pname
== "lexer_accept" then
1019 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1020 else if pname
== "parser_goto" then
1021 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1022 else if pname
== "parser_action" then
1023 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1024 else if pname
== "file_getcwd" then
1025 return v
.native_string_instance
(getcwd
)
1026 else if pname
== "errno" then
1027 return v
.int_instance
(sys
.errno
)
1028 else if pname
== "address_is_null" then
1029 return v
.false_instance
1031 return v
.error_instance
1035 redef class AbstractArray[E
]
1036 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1038 self.copy_to
(start
, len
, dest
, new_start
)
1042 redef class AAttrPropdef
1043 redef fun call
(v
, mpropdef
, args
)
1045 var recv
= args
.first
1046 assert recv
isa MutableInstance
1047 var attr
= self.mpropdef
.mproperty
1048 if mpropdef
== mreadpropdef
then
1049 assert args
.length
== 1
1050 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1051 return evaluate_expr
(v
, recv
)
1052 else if mpropdef
== mwritepropdef
then
1053 assert args
.length
== 2
1054 v
.write_attribute
(attr
, recv
, args
[1])
1061 # Evaluate and set the default value of the attribute in `recv`
1062 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1064 if is_lazy
then return
1065 var nexpr
= self.n_expr
1066 if nexpr
!= null then
1067 evaluate_expr
(v
, recv
)
1070 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1071 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1072 if mtype
isa MNullableType then
1073 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1077 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1079 assert recv
isa MutableInstance
1080 var nexpr
= self.n_expr
1081 assert nexpr
!= null
1082 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1084 var val
= v
.expr
(nexpr
)
1087 assert not v
.is_escaping
1088 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1093 redef class AClassdef
1094 # Execute an implicit `mpropdef` associated with the current node.
1095 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1097 if mpropdef
.mproperty
.is_root_init
then
1098 assert args
.length
== 1
1099 if not mpropdef
.is_intro
then
1100 # standard call-next-method
1101 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1102 v
.call_without_varargs
(superpd
, args
)
1112 # Evaluate the node as a possible expression.
1113 # Return a possible value
1114 # NOTE: Do not call this method directly, but use `v.expr`
1115 # This method is here to be implemented by subclasses.
1116 private fun expr
(v
: NaiveInterpreter): nullable Instance
1118 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1122 # Evaluate the node as a statement.
1123 # NOTE: Do not call this method directly, but use `v.stmt`
1124 # This method is here to be implemented by subclasses (no need to return something).
1125 private fun stmt
(v
: NaiveInterpreter)
1132 redef class ABlockExpr
1135 var last
= self.n_expr
.last
1136 for e
in self.n_expr
do
1137 if e
== last
then break
1139 if v
.is_escaping
then return null
1146 for e
in self.n_expr
do
1148 if v
.is_escaping
then return
1153 redef class AVardeclExpr
1156 var ne
= self.n_expr
1159 if i
== null then return
1160 v
.write_variable
(self.variable
.as(not null), i
)
1165 redef class AVarExpr
1168 return v
.read_variable
(self.variable
.as(not null))
1172 redef class AVarAssignExpr
1175 var i
= v
.expr
(self.n_value
)
1176 if i
== null then return null
1177 v
.write_variable
(self.variable
.as(not null), i
)
1182 redef class AVarReassignExpr
1185 var variable
= self.variable
.as(not null)
1186 var vari
= v
.read_variable
(variable
)
1187 var value
= v
.expr
(self.n_value
)
1188 if value
== null then return
1189 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1191 v
.write_variable
(variable
, res
)
1195 redef class ASelfExpr
1198 return v
.frame
.arguments
.first
1202 redef class AContinueExpr
1205 var ne
= self.n_expr
1208 if i
== null then return
1211 v
.continuemark
= self.escapemark
1215 redef class ABreakExpr
1218 var ne
= self.n_expr
1221 if i
== null then return
1224 v
.breakmark
= self.escapemark
1228 redef class AReturnExpr
1231 var ne
= self.n_expr
1234 if i
== null then return
1237 v
.returnmark
= v
.frame
1241 redef class AAbortExpr
1252 var cond
= v
.expr
(self.n_expr
)
1253 if cond
== null then return null
1254 if cond
.is_true
then
1255 return v
.expr
(self.n_then
.as(not null))
1257 return v
.expr
(self.n_else
.as(not null))
1263 var cond
= v
.expr
(self.n_expr
)
1264 if cond
== null then return
1265 if cond
.is_true
then
1273 redef class AIfexprExpr
1276 var cond
= v
.expr
(self.n_expr
)
1277 if cond
== null then return null
1278 if cond
.is_true
then
1279 return v
.expr
(self.n_then
)
1281 return v
.expr
(self.n_else
)
1289 v
.stmt
(self.n_block
)
1290 v
.is_break
(self.escapemark
) # Clear the break (if any)
1294 redef class AWhileExpr
1298 var cond
= v
.expr
(self.n_expr
)
1299 if cond
== null then return
1300 if not cond
.is_true
then return
1301 v
.stmt
(self.n_block
)
1302 if v
.is_break
(self.escapemark
) then return
1303 v
.is_continue
(self.escapemark
) # Clear the break
1304 if v
.is_escaping
then return
1309 redef class ALoopExpr
1313 v
.stmt
(self.n_block
)
1314 if v
.is_break
(self.escapemark
) then return
1315 v
.is_continue
(self.escapemark
) # Clear the break
1316 if v
.is_escaping
then return
1321 redef class AForExpr
1324 var col
= v
.expr
(self.n_expr
)
1325 if col
== null then return
1326 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1328 #self.debug("col {col}")
1329 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1330 #self.debug("iter {iter}")
1332 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1333 if not isok
.is_true
then return
1334 if self.variables
.length
== 1 then
1335 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1336 #self.debug("item {item}")
1337 v
.write_variable
(self.variables
.first
, item
)
1338 else if self.variables
.length
== 2 then
1339 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1340 v
.write_variable
(self.variables
[0], key
)
1341 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1342 v
.write_variable
(self.variables
[1], item
)
1346 v
.stmt
(self.n_block
)
1347 if v
.is_break
(self.escapemark
) then return
1348 v
.is_continue
(self.escapemark
) # Clear the break
1349 if v
.is_escaping
then return
1350 v
.callsite
(method_next
, [iter
])
1355 redef class AAssertExpr
1358 var cond
= v
.expr
(self.n_expr
)
1359 if cond
== null then return
1360 if not cond
.is_true
then
1362 if v
.is_escaping
then return
1365 fatal
(v
, "Assert '{nid.text}' failed")
1367 fatal
(v
, "Assert failed")
1377 var cond
= v
.expr
(self.n_expr
)
1378 if cond
== null then return null
1379 if cond
.is_true
then return cond
1380 return v
.expr
(self.n_expr2
)
1384 redef class AImpliesExpr
1387 var cond
= v
.expr
(self.n_expr
)
1388 if cond
== null then return null
1389 if not cond
.is_true
then return v
.true_instance
1390 return v
.expr
(self.n_expr2
)
1394 redef class AAndExpr
1397 var cond
= v
.expr
(self.n_expr
)
1398 if cond
== null then return null
1399 if not cond
.is_true
then return cond
1400 return v
.expr
(self.n_expr2
)
1404 redef class ANotExpr
1407 var cond
= v
.expr
(self.n_expr
)
1408 if cond
== null then return null
1409 return v
.bool_instance
(not cond
.is_true
)
1413 redef class AOrElseExpr
1416 var i
= v
.expr
(self.n_expr
)
1417 if i
== null then return null
1418 if i
!= v
.null_instance
then return i
1419 return v
.expr
(self.n_expr2
)
1423 redef class AIntExpr
1426 return v
.int_instance
(self.value
.as(not null))
1430 redef class AFloatExpr
1433 return v
.float_instance
(self.value
.as(not null))
1437 redef class ACharExpr
1440 return v
.char_instance
(self.value
.as(not null))
1444 redef class AArrayExpr
1447 var val
= new Array[Instance]
1448 for nexpr
in self.n_exprs
.n_exprs
do
1449 var i
= v
.expr
(nexpr
)
1450 if i
== null then return null
1453 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1454 var elttype
= mtype
.arguments
.first
1455 return v
.array_instance
(val
, elttype
)
1459 redef class AStringFormExpr
1462 var txt
= self.value
.as(not null)
1463 var nat
= v
.native_string_instance
(txt
)
1464 var res
= v
.send
(v
.force_get_primitive_method
("to_s", nat
.mtype
), [nat
]).as(not null)
1469 redef class ASuperstringExpr
1472 var array
= new Array[Instance]
1473 for nexpr
in n_exprs
do
1474 var i
= v
.expr
(nexpr
)
1475 if i
== null then return null
1478 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1479 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1485 redef class ACrangeExpr
1488 var e1
= v
.expr
(self.n_expr
)
1489 if e1
== null then return null
1490 var e2
= v
.expr
(self.n_expr2
)
1491 if e2
== null then return null
1492 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1493 var res
= new MutableInstance(mtype
)
1494 v
.init_instance
(res
)
1495 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1500 redef class AOrangeExpr
1503 var e1
= v
.expr
(self.n_expr
)
1504 if e1
== null then return null
1505 var e2
= v
.expr
(self.n_expr2
)
1506 if e2
== null then return null
1507 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1508 var res
= new MutableInstance(mtype
)
1509 v
.init_instance
(res
)
1510 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1515 redef class ATrueExpr
1518 return v
.bool_instance
(true)
1522 redef class AFalseExpr
1525 return v
.bool_instance
(false)
1529 redef class ANullExpr
1532 return v
.null_instance
1536 redef class AIsaExpr
1539 var i
= v
.expr
(self.n_expr
)
1540 if i
== null then return null
1541 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1542 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1546 redef class AAsCastExpr
1549 var i
= v
.expr
(self.n_expr
)
1550 if i
== null then return null
1551 var mtype
= self.mtype
.as(not null)
1552 var amtype
= v
.unanchor_type
(mtype
)
1553 if not v
.is_subtype
(i
.mtype
, amtype
) then
1554 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1560 redef class AAsNotnullExpr
1563 var i
= v
.expr
(self.n_expr
)
1564 if i
== null then return null
1565 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1566 if i
.mtype
isa MNullType then
1567 fatal
(v
, "Cast failed")
1573 redef class AParExpr
1576 return v
.expr
(self.n_expr
)
1580 redef class AOnceExpr
1583 if v
.onces
.has_key
(self) then
1584 return v
.onces
[self]
1586 var res
= v
.expr
(self.n_expr
)
1587 if res
== null then return null
1594 redef class ASendExpr
1597 var recv
= v
.expr
(self.n_expr
)
1598 if recv
== null then return null
1600 for a
in self.raw_arguments
do
1602 if i
== null then return null
1606 var res
= v
.callsite
(callsite
, args
)
1611 redef class ASendReassignFormExpr
1614 var recv
= v
.expr
(self.n_expr
)
1615 if recv
== null then return
1617 for a
in self.raw_arguments
do
1619 if i
== null then return
1622 var value
= v
.expr
(self.n_value
)
1623 if value
== null then return
1625 var read
= v
.callsite
(callsite
, args
)
1628 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1629 assert write
!= null
1633 v
.callsite
(write_callsite
, args
)
1637 redef class ASuperExpr
1640 var recv
= v
.frame
.arguments
.first
1642 for a
in self.n_args
.n_exprs
do
1644 if i
== null then return null
1648 var callsite
= self.callsite
1649 if callsite
!= null then
1650 # Add additionnals arguments for the super init call
1651 if args
.length
== 1 then
1652 for i
in [0..callsite
.msignature
.arity
[ do
1653 args
.add
(v
.frame
.arguments
[i
+1])
1657 var res
= v
.callsite
(callsite
, args
)
1661 if args
.length
== 1 then
1662 args
= v
.frame
.arguments
1665 # stantard call-next-method
1666 var mpropdef
= self.mpropdef
1667 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1668 var res
= v
.call_without_varargs
(mpropdef
, args
)
1673 redef class ANewExpr
1676 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1677 var recv
: Instance = new MutableInstance(mtype
)
1678 v
.init_instance
(recv
)
1680 for a
in self.n_args
.n_exprs
do
1682 if i
== null then return null
1685 var res2
= v
.callsite
(callsite
, args
)
1686 if res2
!= null then
1687 #self.debug("got {res2} from {mproperty}. drop {recv}")
1694 redef class AAttrExpr
1697 var recv
= v
.expr
(self.n_expr
)
1698 if recv
== null then return null
1699 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1700 var mproperty
= self.mproperty
.as(not null)
1701 return v
.read_attribute
(mproperty
, recv
)
1705 redef class AAttrAssignExpr
1708 var recv
= v
.expr
(self.n_expr
)
1709 if recv
== null then return
1710 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1711 var i
= v
.expr
(self.n_value
)
1712 if i
== null then return
1713 var mproperty
= self.mproperty
.as(not null)
1714 v
.write_attribute
(mproperty
, recv
, i
)
1718 redef class AAttrReassignExpr
1721 var recv
= v
.expr
(self.n_expr
)
1722 if recv
== null then return
1723 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1724 var value
= v
.expr
(self.n_value
)
1725 if value
== null then return
1726 var mproperty
= self.mproperty
.as(not null)
1727 var attr
= v
.read_attribute
(mproperty
, recv
)
1728 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1730 v
.write_attribute
(mproperty
, recv
, res
)
1734 redef class AIssetAttrExpr
1737 var recv
= v
.expr
(self.n_expr
)
1738 if recv
== null then return null
1739 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1740 var mproperty
= self.mproperty
.as(not null)
1741 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1745 redef class ADebugTypeExpr