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 import auto_super_init
25 private import parser
::tables
27 redef class ToolContext
28 # --discover-call-trace
29 var opt_discover_call_trace
: OptionBool = new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
34 self.option_context
.add_option
(self.opt_discover_call_trace
)
38 redef class ModelBuilder
39 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
40 # `arguments` are the command-line arguments in order
42 # 1. the AST is fully loaded.
43 # 2. the model is fully built.
44 # 3. the instructions are fully analysed.
45 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
48 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
50 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
51 init_naive_interpreter
(interpreter
, mainmodule
)
54 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
57 private fun init_naive_interpreter
(interpreter
: NaiveInterpreter, mainmodule
: MModule) do
58 var sys_type
= mainmodule
.sys_type
59 if sys_type
== null then return # no class Sys
60 var mainobj
= new MutableInstance(sys_type
)
61 interpreter
.mainobj
= mainobj
62 interpreter
.init_instance
(mainobj
)
63 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
64 if initprop
!= null then
65 interpreter
.send
(initprop
, [mainobj
])
67 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
68 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
69 if mainprop
!= null then
70 interpreter
.send
(mainprop
, [mainobj
])
75 # The visitor that interprets the Nit Program by walking on the AST
76 private class NaiveInterpreter
77 # The modelbuilder that know the AST and its associations with the model
78 var modelbuilder
: ModelBuilder
80 # The main moduleof the program (used to lookup methoda
81 var mainmodule
: MModule
83 # The command line arguments of the interpreted program
84 # arguments.first is the program name
85 # arguments[1] is the first argument
86 var arguments
: Array[String]
88 var mainobj
: nullable Instance
90 init(modelbuilder
: ModelBuilder, mainmodule
: MModule, arguments
: Array[String])
92 self.modelbuilder
= modelbuilder
93 self.mainmodule
= mainmodule
94 self.arguments
= arguments
95 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
96 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
97 self.null_instance
= new MutableInstance(mainmodule
.model
.null_type
)
100 # Subtype test in the context of the mainmodule
101 fun is_subtype
(sub
, sup
: MType): Bool
103 return sub
.is_subtype
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType), sup
)
106 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
108 assert recv
isa MClassType
109 return self.modelbuilder
.force_get_primitive_method
(self.frame
.current_node
, name
, recv
.mclass
, self.mainmodule
)
112 # Is a return executed?
113 # Set this mark to skip the evaluation until the end of the specified method frame
114 var returnmark
: nullable Frame = null
116 # Is a break executed?
117 # Set this mark to skip the evaluation until a labeled statement catch it with `is_break`
118 var breakmark
: nullable EscapeMark = null
120 # Is a continue executed?
121 # Set this mark to skip the evaluation until a labeled statement catch it with `is_continue`
122 var continuemark
: nullable EscapeMark = null
124 # Is a return or a break or a continue executed?
125 # Use this function to know if you must skip the evaluation of statements
126 fun is_escaping
: Bool do return returnmark
!= null or breakmark
!= null or continuemark
!= null
128 # The value associated with the current return/break/continue, if any.
129 # Set the value when you set a escapemark.
130 # Read the value when you catch a mark or reach the end of a method
131 var escapevalue
: nullable Instance = null
133 # If there is a break and is associated with `escapemark`, then return true an clear the mark.
134 # If there is no break or if `escapemark` is null then return false.
135 # Use this function to catch a potential break.
136 fun is_break
(escapemark
: nullable EscapeMark): Bool
138 if escapemark
!= null and self.breakmark
== escapemark
then
139 self.breakmark
= null
146 # If there is a continue and is associated with `escapemark`, then return true an clear the mark.
147 # If there is no continue or if `escapemark` is null then return false.
148 # Use this function to catch a potential continue.
149 fun is_continue
(escapemark
: nullable EscapeMark): Bool
151 if escapemark
!= null and self.continuemark
== escapemark
then
152 self.continuemark
= null
159 # Evaluate `n` as an expression in the current context.
160 # Return the value of the expression.
161 # If `n` cannot be evaluated, then aborts.
162 fun expr
(n
: AExpr): nullable Instance
164 var frame
= self.frame
165 var old
= frame
.current_node
166 frame
.current_node
= n
167 #n.debug("IN Execute expr")
169 if i
== null and not self.is_escaping
then
170 n
.debug
("inconsitance: no value and not escaping.")
172 var implicit_cast_to
= n
.implicit_cast_to
173 if implicit_cast_to
!= null then
174 var mtype
= self.unanchor_type
(implicit_cast_to
)
175 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
178 #n.debug("OUT Execute expr: value is {i}")
179 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
180 frame
.current_node
= old
184 # Evaluate `n` as a statement in the current context.
185 # Do nothing if `n` is null.
186 # If `n` cannot be evaluated, then aborts.
187 fun stmt
(n
: nullable AExpr)
190 var frame
= self.frame
191 var old
= frame
.current_node
192 frame
.current_node
= n
193 #n.debug("Execute stmt")
195 frame
.current_node
= old
199 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
200 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
202 # Return the boolean instance associated with `val`.
203 fun bool_instance
(val
: Bool): Instance
205 if val
then return self.true_instance
else return self.false_instance
208 # Return the integer instance associated with `val`.
209 fun int_instance
(val
: Int): Instance
211 var ic
= self.mainmodule
.get_primitive_class
("Int")
212 return new PrimitiveInstance[Int](ic
.mclass_type
, val
)
215 # Return the char instance associated with `val`.
216 fun char_instance
(val
: Char): Instance
218 var ic
= self.mainmodule
.get_primitive_class
("Char")
219 return new PrimitiveInstance[Char](ic
.mclass_type
, val
)
222 # Return the float instance associated with `val`.
223 fun float_instance
(val
: Float): Instance
225 var ic
= self.mainmodule
.get_primitive_class
("Float")
226 return new PrimitiveInstance[Float](ic
.mclass_type
, val
)
229 # The unique intance of the `true` value.
230 var true_instance
: Instance
232 # The unique intance of the `false` value.
233 var false_instance
: Instance
235 # The unique intance of the `null` value.
236 var null_instance
: Instance
238 # Return a new array made of `values`.
239 # The dynamic type of the result is Array[elttype].
240 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
242 assert not elttype
.need_anchor
243 var nat
= new PrimitiveInstance[Array[Instance]](self.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([elttype
]), values
)
244 var mtype
= self.mainmodule
.get_primitive_class
("Array").get_mtype
([elttype
])
245 var res
= new MutableInstance(mtype
)
246 self.init_instance
(res
)
247 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
251 # Return a new native string initialized with `txt`
252 fun native_string_instance
(txt
: String): Instance
254 var val
= new FlatBuffer.from
(txt
)
256 var ic
= self.mainmodule
.get_primitive_class
("NativeString")
257 return new PrimitiveInstance[Buffer](ic
.mclass_type
, val
)
260 # The current frame used to store local variables of the current method executed
261 fun frame
: Frame do return frames
.first
263 # The stack of all frames. The first one is the current one.
264 var frames
: List[Frame] = new List[Frame]
266 # Return a stack stace. One line per function
267 fun stack_trace
: String
269 var b
= new FlatBuffer
270 b
.append
(",---- Stack trace -- - - -\n")
272 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
274 b
.append
("`------------------- - - -")
278 # Exit the program with a message
279 fun fatal
(message
: String)
281 if frames
.is_empty
then
284 self.frame
.current_node
.fatal
(self, message
)
289 # Debug on the current node
290 fun debug
(message
: String)
292 if frames
.is_empty
then
295 self.frame
.current_node
.debug
(message
)
299 # Store known method, used to trace methods as thez are reached
300 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
302 # Common code for calls to injected methods and normal methods
303 fun call_commons
(mpropdef
: MMethodDef, args
: Array[Instance]): Array[Instance]
305 var vararg_rank
= mpropdef
.msignature
.vararg_rank
306 if vararg_rank
>= 0 then
307 assert args
.length
>= mpropdef
.msignature
.arity
+ 1 # because of self
309 args
= new Array[Instance]
311 args
.add
(rawargs
.first
) # recv
313 for i
in [0..vararg_rank
[ do
314 args
.add
(rawargs
[i
+1])
317 var vararg_lastrank
= vararg_rank
+ rawargs
.length-1-mpropdef
.msignature
.arity
318 var vararg
= new Array[Instance]
319 for i
in [vararg_rank
..vararg_lastrank
] do
320 vararg
.add
(rawargs
[i
+1])
322 # FIXME: its it to late to determine the vararg type, this should have been done during a previous analysis
323 var elttype
= mpropdef
.msignature
.mparameters
[vararg_rank
].mtype
.anchor_to
(self.mainmodule
, args
.first
.mtype
.as(MClassType))
324 args
.add
(self.array_instance
(vararg
, elttype
))
326 for i
in [vararg_lastrank
+1..rawargs
.length-1
[ do
327 args
.add
(rawargs
[i
+1])
333 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
334 # Return a falue if `mpropdef` is a function, or null if it is a procedure.
335 # The call is direct/static. There is no message-seding/late-binding.
336 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
338 args
= call_commons
(mpropdef
, args
)
339 return call_without_varargs
(mpropdef
, args
)
342 # Common code to call and this function
344 # Call only executes the variadic part, this avoids
345 # double encapsulation of variadic parameters into an Array
346 fun call_without_varargs
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
348 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
349 self.discover_call_trace
.add mpropdef
350 self.debug
("Discovered {mpropdef}")
352 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
354 # Look for the AST node that implements the property
355 var mproperty
= mpropdef
.mproperty
356 if self.modelbuilder
.mpropdef2npropdef
.has_key
(mpropdef
) then
357 var npropdef
= self.modelbuilder
.mpropdef2npropdef
[mpropdef
]
358 self.parameter_check
(npropdef
, mpropdef
, args
)
359 return npropdef
.call
(self, mpropdef
, args
)
360 else if mproperty
.name
== "init" then
361 var nclassdef
= self.modelbuilder
.mclassdef2nclassdef
[mpropdef
.mclassdef
]
362 self.parameter_check
(nclassdef
, mpropdef
, args
)
363 return nclassdef
.call
(self, mpropdef
, args
)
365 fatal
("Fatal Error: method {mpropdef} not found in the AST")
370 # Generate type checks in the C code to check covariant parameters
371 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
373 var msignature
= mpropdef
.msignature
374 for i
in [0..msignature
.arity
[ do
375 # skip test for vararg since the array is instantiated with the correct polymorphic type
376 if msignature
.vararg_rank
== i
then continue
378 # skip if the cast is not required
379 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
380 if not origmtype
.need_anchor
then continue
382 # get the parameter type
383 var mtype
= msignature
.mparameters
[i
].mtype
384 var anchor
= args
.first
.mtype
.as(MClassType)
385 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
386 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
387 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
392 # Common code for runtime injected calls and normal calls
393 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
395 if mtype
isa MNullType then
396 if mproperty
.name
== "==" then
397 return self.bool_instance
(args
[0] == args
[1])
398 else if mproperty
.name
== "!=" then
399 return self.bool_instance
(args
[0] != args
[1])
401 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
402 fatal
("Receiver is null")
407 # Execute a full `callsite` for given `args`
408 # Use this method, instead of `send` to execute and control the aditionnal behavior of the call-sites
409 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
411 var initializers
= callsite
.mpropdef
.initializers
412 if not initializers
.is_empty
then
413 assert initializers
.length
== arguments
.length
- 1 else debug
("expected {initializers.length} got {arguments.length - 1}")
414 var recv
= arguments
.first
416 for p
in initializers
do
417 if p
isa MMethod then
418 self.send
(p
, [recv
, arguments
[i
]])
419 else if p
isa MAttribute then
420 assert recv
isa MutableInstance
421 recv
.attributes
[p
] = arguments
[i
]
425 return send
(callsite
.mproperty
, [recv
])
427 return send
(callsite
.mproperty
, arguments
)
430 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
431 # Return a falue if `mproperty` is a function, or null if it is a procedure.
432 # The call is polimotphic. There is a message-seding/late-bindng according to te receiver (args[0]).
433 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
435 var recv
= args
.first
436 var mtype
= recv
.mtype
437 var ret
= send_commons
(mproperty
, args
, mtype
)
438 if ret
!= null then return ret
439 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
440 return self.call
(propdef
, args
)
443 # Read the attribute `mproperty` of an instance `recv` and return its value.
444 # If the attribute in not yet initialized, then aborts with an error message.
445 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
447 assert recv
isa MutableInstance
448 if not recv
.attributes
.has_key
(mproperty
) then
449 fatal
("Uninitialized attribute {mproperty.name}")
452 return recv
.attributes
[mproperty
]
455 # Replace in `recv` the value of the attribute `mproperty` by `value`
456 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
458 assert recv
isa MutableInstance
459 recv
.attributes
[mproperty
] = value
462 # Is the attribute `mproperty` initialized the instance `recv`?
463 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
465 assert recv
isa MutableInstance
466 return recv
.attributes
.has_key
(mproperty
)
469 # Collect attributes of a type in the order of their init
470 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
472 var cache
= self.collect_attr_propdef_cache
473 if cache
.has_key
(mtype
) then return cache
[mtype
]
475 var res
= new Array[AAttrPropdef]
476 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
477 self.mainmodule
.linearize_mclassdefs
(cds
)
479 var n
= self.modelbuilder
.mclassdef2nclassdef
[cd
]
480 for npropdef
in n
.n_propdefs
do
481 if npropdef
isa AAttrPropdef then
491 var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
493 # Fill the initial values of the newly created instance `recv`.
494 # `recv.mtype` is used to know what must be filled.
495 fun init_instance
(recv
: Instance)
497 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
498 npropdef
.init_expr
(self, recv
)
502 # This function determine the correct type according the reciever of the current definition (self).
503 fun unanchor_type
(mtype
: MType): MType
505 return mtype
.anchor_to
(self.mainmodule
, self.frame
.arguments
.first
.mtype
.as(MClassType))
509 # An instance represents a value of the executed program.
510 abstract class Instance
511 # The dynamic type of the instance
512 # ASSERT: not self.mtype.is_anchored
515 # return true if the instance is the true value.
516 # return false if the instance is the true value.
518 fun is_true
: Bool do abort
520 # Return true if `self` IS `o` (using the Nit semantic of is)
521 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
523 # Human readable object identity "Type#number"
524 redef fun to_s
do return "{mtype}"
526 # Return the integer value if the instance is an integer.
528 fun to_i
: Int do abort
530 # Return the integer value if the instance is a float.
532 fun to_f
: Float do abort
534 # The real value encapsulated if the instance is primitive.
536 fun val
: Object do abort
539 # A instance with attribute (standards objects)
540 class MutableInstance
543 # The values of the attributes
544 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
547 # Special instance to handle primitives values (int, bool, etc.)
548 # The trick it just to encapsulate the <<real>> value
549 class PrimitiveInstance[E
: Object]
552 # The real value encapsulated
555 init(mtype
: MType, val
: E
)
563 if val
== true then return true
564 if val
== false then return false
570 if not o
isa PrimitiveInstance[Object] then return false
571 return self.val
== o
.val
576 if not o
isa PrimitiveInstance[Object] then return false
577 return self.val
.is_same_instance
(o
.val
)
580 redef fun to_s
do return "{mtype}#{val.object_id}({val})"
582 redef fun to_i
do return val
.as(Int)
584 redef fun to_f
do return val
.as(Float)
587 # Information about local variables in a running method
589 # The current visited node
590 # The node is stored by frame to keep a stack trace
591 var current_node
: ANode
592 # The executed property.
593 # A Method in case of a call, an attribute in case of a default initialization.
594 var mpropdef
: MPropDef
595 # Arguments of the method (the first is te receiver
596 var arguments
: Array[Instance]
597 # Mapping betwen a variable an the current value
598 var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
602 # Aborts the program with a message
603 # `v` is used to know if a colored message is displayed or not
604 private fun fatal
(v
: NaiveInterpreter, message
: String)
606 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
607 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
609 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
610 sys
.stderr
.write
(v
.stack_trace
)
611 sys
.stderr
.write
("\n")
618 # Execute a `mpropdef` associated with the current node.
619 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
621 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
626 redef class AMethPropdef
629 redef fun call
(v
, mpropdef
, args
)
631 var f
= new Frame(self, self.mpropdef
.as(not null), args
)
632 var res
= call_commons
(v
, mpropdef
, args
, f
)
634 if v
.returnmark
== f
then
643 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
645 for i
in [0..mpropdef
.msignature
.arity
[ do
646 var variable
= self.n_signature
.n_params
[i
].variable
647 assert variable
!= null
648 f
.map
[variable
] = arguments
[i
+1]
653 if mpropdef
.is_abstract
then
654 v
.fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{arguments.first.mtype}`")
658 # Call the implicit super-init
659 var auto_super_inits
= self.auto_super_inits
660 if auto_super_inits
!= null then
661 var args
= [arguments
.first
]
662 for auto_super_init
in auto_super_inits
do
664 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
665 args
.add
(arguments
[i
])
667 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
668 v
.callsite
(auto_super_init
, args
)
671 if auto_super_call
then
672 # standard call-next-method
673 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
674 v
.call_without_varargs
(superpd
, arguments
)
677 if n_block
!= null then
681 return intern_call
(v
, mpropdef
, arguments
)
685 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
687 var pname
= mpropdef
.mproperty
.name
688 var cname
= mpropdef
.mclassdef
.mclass
.name
689 if pname
== "output" then
690 var recv
= args
.first
693 else if pname
== "object_id" then
694 var recv
= args
.first
695 if recv
isa PrimitiveInstance[Object] then
696 return v
.int_instance
(recv
.val
.object_id
)
698 return v
.int_instance
(recv
.object_id
)
700 else if pname
== "output_class_name" then
701 var recv
= args
.first
704 else if pname
== "native_class_name" then
705 var recv
= args
.first
706 var txt
= recv
.mtype
.to_s
707 return v
.native_string_instance
(txt
)
708 else if pname
== "==" then
709 # == is correclt redefined for instances
710 return v
.bool_instance
(args
[0] == args
[1])
711 else if pname
== "!=" then
712 return v
.bool_instance
(args
[0] != args
[1])
713 else if pname
== "is_same_type" then
714 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
715 else if pname
== "is_same_instance" then
716 return v
.bool_instance
(args
[1] != null and args
[0].eq_is
(args
[1]))
717 else if pname
== "exit" then
720 else if pname
== "sys" then
722 else if cname
== "Int" then
723 var recvval
= args
[0].to_i
724 if pname
== "unary -" then
725 return v
.int_instance
(-args
[0].to_i
)
726 else if pname
== "+" then
727 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
728 else if pname
== "-" then
729 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
730 else if pname
== "*" then
731 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
732 else if pname
== "%" then
733 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
734 else if pname
== "/" then
735 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
736 else if pname
== "<" then
737 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
738 else if pname
== ">" then
739 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
740 else if pname
== "<=" then
741 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
742 else if pname
== ">=" then
743 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
744 else if pname
== "<=>" then
745 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
746 else if pname
== "ascii" then
747 return v
.char_instance
(args
[0].to_i
.ascii
)
748 else if pname
== "to_f" then
749 return v
.float_instance
(args
[0].to_i
.to_f
)
750 else if pname
== "lshift" then
751 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
752 else if pname
== "rshift" then
753 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
754 else if pname
== "rand" then
755 var res
= recvval
.rand
756 return v
.int_instance
(res
)
757 else if pname
== "bin_and" then
758 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
759 else if pname
== "bin_or" then
760 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
761 else if pname
== "bin_xor" then
762 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
763 else if pname
== "native_int_to_s" then
764 return v
.native_string_instance
(recvval
.to_s
)
765 else if pname
== "strerror_ext" then
766 return v
.native_string_instance
(recvval
.strerror
)
768 else if cname
== "Char" then
769 var recv
= args
[0].val
.as(Char)
770 if pname
== "ascii" then
771 return v
.int_instance
(recv
.ascii
)
772 else if pname
== "successor" then
773 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
774 else if pname
== "predecessor" then
775 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
776 else if pname
== "<" then
777 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
778 else if pname
== ">" then
779 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
780 else if pname
== "<=" then
781 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
782 else if pname
== ">=" then
783 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
784 else if pname
== "<=>" then
785 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
787 else if cname
== "Float" then
788 var recv
= args
[0].to_f
789 if pname
== "unary -" then
790 return v
.float_instance
(-recv
)
791 else if pname
== "+" then
792 return v
.float_instance
(recv
+ args
[1].to_f
)
793 else if pname
== "-" then
794 return v
.float_instance
(recv
- args
[1].to_f
)
795 else if pname
== "*" then
796 return v
.float_instance
(recv
* args
[1].to_f
)
797 else if pname
== "/" then
798 return v
.float_instance
(recv
/ args
[1].to_f
)
799 else if pname
== "<" then
800 return v
.bool_instance
(recv
< args
[1].to_f
)
801 else if pname
== ">" then
802 return v
.bool_instance
(recv
> args
[1].to_f
)
803 else if pname
== "<=" then
804 return v
.bool_instance
(recv
<= args
[1].to_f
)
805 else if pname
== ">=" then
806 return v
.bool_instance
(recv
>= args
[1].to_f
)
807 else if pname
== "to_i" then
808 return v
.int_instance
(recv
.to_i
)
809 else if pname
== "cos" then
810 return v
.float_instance
(args
[0].to_f
.cos
)
811 else if pname
== "sin" then
812 return v
.float_instance
(args
[0].to_f
.sin
)
813 else if pname
== "tan" then
814 return v
.float_instance
(args
[0].to_f
.tan
)
815 else if pname
== "acos" then
816 return v
.float_instance
(args
[0].to_f
.acos
)
817 else if pname
== "asin" then
818 return v
.float_instance
(args
[0].to_f
.asin
)
819 else if pname
== "atan" then
820 return v
.float_instance
(args
[0].to_f
.atan
)
821 else if pname
== "sqrt" then
822 return v
.float_instance
(args
[0].to_f
.sqrt
)
823 else if pname
== "exp" then
824 return v
.float_instance
(args
[0].to_f
.exp
)
825 else if pname
== "log" then
826 return v
.float_instance
(args
[0].to_f
.log
)
827 else if pname
== "pow" then
828 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
829 else if pname
== "rand" then
830 return v
.float_instance
(args
[0].to_f
.rand
)
831 else if pname
== "abs" then
832 return v
.float_instance
(args
[0].to_f
.abs
)
833 else if pname
== "hypot_with" then
834 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
835 else if pname
== "is_nan" then
836 return v
.bool_instance
(args
[0].to_f
.is_nan
)
837 else if pname
== "is_inf_extern" then
838 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
840 else if cname
== "NativeString" then
841 if pname
== "init" then
842 return v
.native_string_instance
("!" * args
[1].to_i
)
844 var recvval
= args
.first
.val
.as(Buffer)
845 if pname
== "[]" then
846 var arg1
= args
[1].to_i
847 if arg1
>= recvval
.length
or arg1
< 0 then
848 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
850 return v
.char_instance
(recvval
.chars
[arg1
])
851 else if pname
== "[]=" then
852 var arg1
= args
[1].to_i
853 if arg1
>= recvval
.length
or arg1
< 0 then
854 debug
("Illegal access on {recvval} for element {arg1}/{recvval.length}")
856 recvval
.chars
[arg1
] = args
[2].val
.as(Char)
858 else if pname
== "copy_to" then
859 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
860 var destval
= args
[1].val
.as(FlatBuffer)
861 var lenval
= args
[2].to_i
862 var fromval
= args
[3].to_i
863 var toval
= args
[4].to_i
865 debug
("Illegal access on {recvval} for element {fromval}/{recvval.length}")
867 if fromval
+ lenval
>= recvval
.length
then
868 debug
("Illegal access on {recvval} for element {fromval}+{lenval}/{recvval.length}")
871 debug
("Illegal access on {destval} for element {toval}/{destval.length}")
873 if toval
+ lenval
>= destval
.length
then
874 debug
("Illegal access on {destval} for element {toval}+{lenval}/{destval.length}")
876 recvval
.as(FlatBuffer).copy
(fromval
, lenval
, destval
, toval
)
878 else if pname
== "atoi" then
879 return v
.int_instance
(recvval
.to_i
)
880 else if pname
== "file_exists" then
881 return v
.bool_instance
(recvval
.to_s
.file_exists
)
882 else if pname
== "file_mkdir" then
885 else if pname
== "file_chdir" then
888 else if pname
== "file_realpath" then
889 return v
.native_string_instance
(recvval
.to_s
.realpath
)
890 else if pname
== "get_environ" then
891 var txt
= recvval
.to_s
.environ
892 return v
.native_string_instance
(txt
)
893 else if pname
== "system" then
894 var res
= sys
.system
(recvval
.to_s
)
895 return v
.int_instance
(res
)
896 else if pname
== "atof" then
897 return v
.float_instance
(recvval
.to_f
)
899 else if pname
== "calloc_string" then
900 return v
.native_string_instance
("!" * args
[1].to_i
)
901 else if cname
== "NativeArray" then
902 if pname
== "init" then
903 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
904 return new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
906 var recvval
= args
.first
.val
.as(Array[Instance])
907 if pname
== "[]" then
908 if args
[1].to_i
>= recvval
.length
or args
[1].to_i
< 0 then
909 debug
("Illegal access on {recvval} for element {args[1].to_i}/{recvval.length}")
911 return recvval
[args
[1].to_i
]
912 else if pname
== "[]=" then
913 recvval
[args
[1].to_i
] = args
[2]
915 else if pname
== "length" then
916 return v
.int_instance
(recvval
.length
)
917 else if pname
== "copy_to" then
918 recvval
.copy
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
921 else if cname
== "NativeFile" then
922 if pname
== "native_stdout" then
923 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdout
)
924 else if pname
== "native_stdin" then
925 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stdin
)
926 else if pname
== "native_stderr" then
927 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, sys
.stderr
)
928 else if pname
== "io_open_read" then
929 var a1
= args
[1].val
.as(Buffer)
930 return new PrimitiveInstance[IStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new IFStream.open
(a1
.to_s
))
931 else if pname
== "io_open_write" then
932 var a1
= args
[1].val
.as(Buffer)
933 return new PrimitiveInstance[OStream](mpropdef
.mclassdef
.mclass
.mclass_type
, new OFStream.open
(a1
.to_s
))
935 var recvval
= args
.first
.val
936 if pname
== "io_write" then
937 var a1
= args
[1].val
.as(Buffer)
938 recvval
.as(OStream).write
(a1
.substring
(0, args
[2].to_i
).to_s
)
940 else if pname
== "io_read" then
941 var str
= recvval
.as(IStream).read
(args
[2].to_i
)
942 var a1
= args
[1].val
.as(Buffer)
943 new FlatBuffer.from
(str
).copy
(0, str
.length
, a1
.as(FlatBuffer), 0)
944 return v
.int_instance
(str
.length
)
945 else if pname
== "io_close" then
946 recvval
.as(IOS).close
947 return v
.int_instance
(0)
948 else if pname
== "address_is_null" then
949 return v
.false_instance
951 else if pname
== "calloc_array" then
952 var recvtype
= args
.first
.mtype
.as(MClassType)
954 mtype
= recvtype
.supertype_to
(v
.mainmodule
, recvtype
, v
.mainmodule
.get_primitive_class
("ArrayCapable"))
955 mtype
= mtype
.arguments
.first
956 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
957 return new PrimitiveInstance[Array[Instance]](v
.mainmodule
.get_primitive_class
("NativeArray").get_mtype
([mtype
]), val
)
958 else if pname
== "native_argc" then
959 return v
.int_instance
(v
.arguments
.length
)
960 else if pname
== "native_argv" then
961 var txt
= v
.arguments
[args
[1].to_i
]
962 return v
.native_string_instance
(txt
)
963 else if pname
== "native_argc" then
964 return v
.int_instance
(v
.arguments
.length
)
965 else if pname
== "native_argv" then
966 var txt
= v
.arguments
[args
[1].to_i
]
967 return v
.native_string_instance
(txt
)
968 else if pname
== "get_time" then
969 return v
.int_instance
(get_time
)
970 else if pname
== "srand_from" then
971 srand_from
(args
[1].to_i
)
973 else if pname
== "atan2" then
974 return v
.float_instance
(atan2
(args
[1].to_f
, args
[2].to_f
))
975 else if pname
== "pi" then
976 return v
.float_instance
(pi
)
977 else if pname
== "lexer_goto" then
978 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
979 else if pname
== "lexer_accept" then
980 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
981 else if pname
== "parser_goto" then
982 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
983 else if pname
== "parser_action" then
984 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
985 else if pname
== "file_getcwd" then
986 return v
.native_string_instance
(getcwd
)
987 else if pname
== "errno" then
988 return v
.int_instance
(sys
.errno
)
989 else if pname
== "address_is_null" then
990 return v
.false_instance
992 if mpropdef
.is_intern
then
993 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
994 else if mpropdef
.is_extern
then
995 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
997 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
1003 redef class AbstractArray[E
]
1004 fun copy
(start
: Int, len
: Int, dest
: AbstractArray[E
], new_start
: Int)
1006 self.copy_to
(start
, len
, dest
, new_start
)
1010 redef class AAttrPropdef
1011 redef fun call
(v
, mpropdef
, args
)
1013 var recv
= args
.first
1014 assert recv
isa MutableInstance
1015 var attr
= self.mpropdef
.mproperty
1016 if mpropdef
== mreadpropdef
then
1017 assert args
.length
== 1
1018 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1019 return evaluate_expr
(v
, recv
)
1020 else if mpropdef
== mwritepropdef
then
1021 assert args
.length
== 2
1022 v
.write_attribute
(attr
, recv
, args
[1])
1029 # Evaluate and set the default value of the attribute in `recv`
1030 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1032 if is_lazy
then return
1033 var nexpr
= self.n_expr
1034 if nexpr
!= null then
1035 evaluate_expr
(v
, recv
)
1038 var mtype
= self.mpropdef
.static_mtype
.as(not null)
1039 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1040 if mtype
isa MNullableType then
1041 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1045 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance): Instance
1047 assert recv
isa MutableInstance
1048 var nexpr
= self.n_expr
1049 assert nexpr
!= null
1050 var f
= new Frame(self, self.mpropdef
.as(not null), [recv
])
1052 var val
= v
.expr
(nexpr
)
1055 assert not v
.is_escaping
1056 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1061 redef class AClassdef
1062 # Execute an implicit `mpropdef` associated with the current node.
1063 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1065 if mpropdef
.mproperty
.is_root_init
then
1066 assert self.super_inits
== null
1067 assert args
.length
== 1
1068 if not mpropdef
.is_intro
then
1069 # standard call-next-method
1070 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1071 v
.call_without_varargs
(superpd
, args
)
1076 var super_inits
= self.super_inits
1077 if super_inits
!= null then
1078 var args_of_super
= args
1079 if args
.length
> 1 then args_of_super
= [args
.first
]
1080 for su
in super_inits
do
1081 v
.send
(su
, args_of_super
)
1084 var recv
= args
.first
1085 assert recv
isa MutableInstance
1087 # Collect undefined attributes
1088 for npropdef
in self.n_propdefs
do
1089 if npropdef
isa AAttrPropdef and not npropdef
.noinit
and npropdef
.n_expr
== null then
1090 v
.write_attribute
(npropdef
.mpropdef
.mproperty
, recv
, args
[i
])
1099 # Evaluate the node as a possible expression.
1100 # Return a possible value
1101 # NOTE: Do not call this method directly, but use `v.expr`
1102 # This method is here to be implemented by subclasses.
1103 private fun expr
(v
: NaiveInterpreter): nullable Instance
1105 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1109 # Evaluate the node as a statement.
1110 # NOTE: Do not call this method directly, but use `v.stmt`
1111 # This method is here to be implemented by subclasses (no need to return something).
1112 private fun stmt
(v
: NaiveInterpreter)
1119 redef class ABlockExpr
1122 var last
= self.n_expr
.last
1123 for e
in self.n_expr
do
1124 if e
== last
then break
1126 if v
.is_escaping
then return null
1133 for e
in self.n_expr
do
1135 if v
.is_escaping
then return
1140 redef class AVardeclExpr
1143 var ne
= self.n_expr
1146 if i
== null then return
1147 v
.frame
.map
[self.variable
.as(not null)] = i
1152 redef class AVarExpr
1155 return v
.frame
.map
[self.variable
.as(not null)]
1159 redef class AVarAssignExpr
1162 var i
= v
.expr
(self.n_value
)
1163 if i
== null then return null
1164 v
.frame
.map
[self.variable
.as(not null)] = i
1169 redef class AVarReassignExpr
1172 var vari
= v
.frame
.map
[self.variable
.as(not null)]
1173 var value
= v
.expr
(self.n_value
)
1174 if value
== null then return
1175 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1177 v
.frame
.map
[self.variable
.as(not null)] = res
1181 redef class ASelfExpr
1184 return v
.frame
.arguments
.first
1188 redef class AContinueExpr
1191 var ne
= self.n_expr
1194 if i
== null then return
1197 v
.continuemark
= self.escapemark
1201 redef class ABreakExpr
1204 var ne
= self.n_expr
1207 if i
== null then return
1210 v
.breakmark
= self.escapemark
1214 redef class AReturnExpr
1217 var ne
= self.n_expr
1220 if i
== null then return
1223 v
.returnmark
= v
.frame
1227 redef class AAbortExpr
1238 var cond
= v
.expr
(self.n_expr
)
1239 if cond
== null then return null
1240 if cond
.is_true
then
1241 return v
.expr
(self.n_then
.as(not null))
1243 return v
.expr
(self.n_else
.as(not null))
1249 var cond
= v
.expr
(self.n_expr
)
1250 if cond
== null then return
1251 if cond
.is_true
then
1259 redef class AIfexprExpr
1262 var cond
= v
.expr
(self.n_expr
)
1263 if cond
== null then return null
1264 if cond
.is_true
then
1265 return v
.expr
(self.n_then
)
1267 return v
.expr
(self.n_else
)
1275 v
.stmt
(self.n_block
)
1276 v
.is_break
(self.escapemark
) # Clear the break (if any)
1280 redef class AWhileExpr
1284 var cond
= v
.expr
(self.n_expr
)
1285 if cond
== null then return
1286 if not cond
.is_true
then return
1287 v
.stmt
(self.n_block
)
1288 if v
.is_break
(self.escapemark
) then return
1289 v
.is_continue
(self.escapemark
) # Clear the break
1290 if v
.is_escaping
then return
1295 redef class ALoopExpr
1299 v
.stmt
(self.n_block
)
1300 if v
.is_break
(self.escapemark
) then return
1301 v
.is_continue
(self.escapemark
) # Clear the break
1302 if v
.is_escaping
then return
1307 redef class AForExpr
1310 var col
= v
.expr
(self.n_expr
)
1311 if col
== null then return
1312 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1314 #self.debug("col {col}")
1315 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1316 #self.debug("iter {iter}")
1318 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1319 if not isok
.is_true
then return
1320 if self.variables
.length
== 1 then
1321 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1322 #self.debug("item {item}")
1323 v
.frame
.map
[self.variables
.first
] = item
1324 else if self.variables
.length
== 2 then
1325 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1326 v
.frame
.map
[self.variables
[0]] = key
1327 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1328 v
.frame
.map
[self.variables
[1]] = item
1332 v
.stmt
(self.n_block
)
1333 if v
.is_break
(self.escapemark
) then return
1334 v
.is_continue
(self.escapemark
) # Clear the break
1335 if v
.is_escaping
then return
1336 v
.callsite
(method_next
, [iter
])
1341 redef class AAssertExpr
1344 var cond
= v
.expr
(self.n_expr
)
1345 if cond
== null then return
1346 if not cond
.is_true
then
1348 if v
.is_escaping
then return
1351 fatal
(v
, "Assert '{nid.text}' failed")
1353 fatal
(v
, "Assert failed")
1363 var cond
= v
.expr
(self.n_expr
)
1364 if cond
== null then return null
1365 if cond
.is_true
then return cond
1366 return v
.expr
(self.n_expr2
)
1370 redef class AImpliesExpr
1373 var cond
= v
.expr
(self.n_expr
)
1374 if cond
== null then return null
1375 if not cond
.is_true
then return v
.true_instance
1376 return v
.expr
(self.n_expr2
)
1380 redef class AAndExpr
1383 var cond
= v
.expr
(self.n_expr
)
1384 if cond
== null then return null
1385 if not cond
.is_true
then return cond
1386 return v
.expr
(self.n_expr2
)
1390 redef class ANotExpr
1393 var cond
= v
.expr
(self.n_expr
)
1394 if cond
== null then return null
1395 return v
.bool_instance
(not cond
.is_true
)
1399 redef class AOrElseExpr
1402 var i
= v
.expr
(self.n_expr
)
1403 if i
== null then return null
1404 if i
!= v
.null_instance
then return i
1405 return v
.expr
(self.n_expr2
)
1409 redef class AIntExpr
1412 return v
.int_instance
(self.value
.as(not null))
1416 redef class AFloatExpr
1419 return v
.float_instance
(self.value
.as(not null))
1423 redef class ACharExpr
1426 return v
.char_instance
(self.value
.as(not null))
1430 redef class AArrayExpr
1433 var val
= new Array[Instance]
1434 for nexpr
in self.n_exprs
.n_exprs
do
1435 var i
= v
.expr
(nexpr
)
1436 if i
== null then return null
1439 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1440 var elttype
= mtype
.arguments
.first
1441 return v
.array_instance
(val
, elttype
)
1445 redef class AStringFormExpr
1448 var txt
= self.value
.as(not null)
1449 var nat
= v
.native_string_instance
(txt
)
1450 var res
= v
.send
(v
.force_get_primitive_method
("to_s", nat
.mtype
), [nat
]).as(not null)
1455 redef class ASuperstringExpr
1458 var array
= new Array[Instance]
1459 for nexpr
in n_exprs
do
1460 var i
= v
.expr
(nexpr
)
1461 if i
== null then return null
1464 var i
= v
.array_instance
(array
, v
.mainmodule
.get_primitive_class
("Object").mclass_type
)
1465 var res
= v
.send
(v
.force_get_primitive_method
("to_s", i
.mtype
), [i
])
1471 redef class ACrangeExpr
1474 var e1
= v
.expr
(self.n_expr
)
1475 if e1
== null then return null
1476 var e2
= v
.expr
(self.n_expr2
)
1477 if e2
== null then return null
1478 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1479 var res
= new MutableInstance(mtype
)
1480 v
.init_instance
(res
)
1481 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1486 redef class AOrangeExpr
1489 var e1
= v
.expr
(self.n_expr
)
1490 if e1
== null then return null
1491 var e2
= v
.expr
(self.n_expr2
)
1492 if e2
== null then return null
1493 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1494 var res
= new MutableInstance(mtype
)
1495 v
.init_instance
(res
)
1496 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1501 redef class ATrueExpr
1504 return v
.bool_instance
(true)
1508 redef class AFalseExpr
1511 return v
.bool_instance
(false)
1515 redef class ANullExpr
1518 return v
.null_instance
1522 redef class AIsaExpr
1525 var i
= v
.expr
(self.n_expr
)
1526 if i
== null then return null
1527 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1528 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1532 redef class AAsCastExpr
1535 var i
= v
.expr
(self.n_expr
)
1536 if i
== null then return null
1537 var mtype
= self.mtype
.as(not null)
1538 var amtype
= v
.unanchor_type
(mtype
)
1539 if not v
.is_subtype
(i
.mtype
, amtype
) then
1540 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1546 redef class AAsNotnullExpr
1549 var i
= v
.expr
(self.n_expr
)
1550 if i
== null then return null
1551 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1552 if i
.mtype
isa MNullType then
1553 fatal
(v
, "Cast failed")
1559 redef class AParExpr
1562 return v
.expr
(self.n_expr
)
1566 redef class AOnceExpr
1569 if v
.onces
.has_key
(self) then
1570 return v
.onces
[self]
1572 var res
= v
.expr
(self.n_expr
)
1573 if res
== null then return null
1580 redef class ASendExpr
1583 var recv
= v
.expr
(self.n_expr
)
1584 if recv
== null then return null
1586 for a
in self.raw_arguments
do
1588 if i
== null then return null
1592 var res
= v
.callsite
(callsite
, args
)
1597 redef class ASendReassignFormExpr
1600 var recv
= v
.expr
(self.n_expr
)
1601 if recv
== null then return
1603 for a
in self.raw_arguments
do
1605 if i
== null then return
1608 var value
= v
.expr
(self.n_value
)
1609 if value
== null then return
1611 var read
= v
.callsite
(callsite
, args
)
1614 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1615 assert write
!= null
1619 v
.callsite
(write_callsite
, args
)
1623 redef class ASuperExpr
1626 var recv
= v
.frame
.arguments
.first
1628 for a
in self.n_args
.n_exprs
do
1630 if i
== null then return null
1634 var callsite
= self.callsite
1635 if callsite
!= null then
1636 # Add additionnals arguments for the super init call
1637 if args
.length
== 1 then
1638 for i
in [0..callsite
.msignature
.arity
[ do
1639 args
.add
(v
.frame
.arguments
[i
+1])
1643 var res
= v
.callsite
(callsite
, args
)
1647 if args
.length
== 1 then
1648 args
= v
.frame
.arguments
1651 # stantard call-next-method
1652 var mpropdef
= self.mpropdef
1653 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1654 var res
= v
.call_without_varargs
(mpropdef
, args
)
1659 redef class ANewExpr
1662 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1663 var recv
: Instance = new MutableInstance(mtype
)
1664 v
.init_instance
(recv
)
1666 for a
in self.n_args
.n_exprs
do
1668 if i
== null then return null
1671 var res2
= v
.callsite
(callsite
, args
)
1672 if res2
!= null then
1673 #self.debug("got {res2} from {mproperty}. drop {recv}")
1680 redef class AAttrExpr
1683 var recv
= v
.expr
(self.n_expr
)
1684 if recv
== null then return null
1685 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1686 var mproperty
= self.mproperty
.as(not null)
1687 return v
.read_attribute
(mproperty
, recv
)
1691 redef class AAttrAssignExpr
1694 var recv
= v
.expr
(self.n_expr
)
1695 if recv
== null then return
1696 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1697 var i
= v
.expr
(self.n_value
)
1698 if i
== null then return
1699 var mproperty
= self.mproperty
.as(not null)
1700 v
.write_attribute
(mproperty
, recv
, i
)
1704 redef class AAttrReassignExpr
1707 var recv
= v
.expr
(self.n_expr
)
1708 if recv
== null then return
1709 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1710 var value
= v
.expr
(self.n_value
)
1711 if value
== null then return
1712 var mproperty
= self.mproperty
.as(not null)
1713 var attr
= v
.read_attribute
(mproperty
, recv
)
1714 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1716 v
.write_attribute
(mproperty
, recv
, res
)
1720 redef class AIssetAttrExpr
1723 var recv
= v
.expr
(self.n_expr
)
1724 if recv
== null then return null
1725 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1726 var mproperty
= self.mproperty
.as(not null)
1727 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1731 redef class ADebugTypeExpr