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 import primitive_types
26 redef class ToolContext
27 # --discover-call-trace
28 var opt_discover_call_trace
= new OptionBool("Trace calls of the first invocation of a method", "--discover-call-trace")
33 self.option_context
.add_option
(self.opt_discover_call_trace
)
37 redef class ModelBuilder
38 # Execute the program from the entry point (`Sys::main`) of the `mainmodule`
39 # `arguments` are the command-line arguments in order
41 # 1. the AST is fully loaded.
42 # 2. the model is fully built.
43 # 3. the instructions are fully analysed.
44 fun run_naive_interpreter
(mainmodule
: MModule, arguments
: Array[String])
47 self.toolcontext
.info
("*** START INTERPRETING ***", 1)
49 var interpreter
= new NaiveInterpreter(self, mainmodule
, arguments
)
50 interpreter
.start
(mainmodule
)
53 self.toolcontext
.info
("*** END INTERPRETING: {time1-time0} ***", 2)
57 # The visitor that interprets the Nit Program by walking on the AST
58 class NaiveInterpreter
59 # The modelbuilder that know the AST and its associations with the model
60 var modelbuilder
: ModelBuilder
62 # The main module of the program (used to lookup method)
63 var mainmodule
: MModule
65 # The command line arguments of the interpreted program
66 # arguments.first is the program name
67 # arguments[1] is the first argument
68 var arguments
: Array[String]
70 # The main Sys instance
71 var mainobj
: nullable Instance is noinit
75 if mainmodule
.model
.get_mclasses_by_name
("Bool") != null then
76 self.true_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, true)
77 init_instance_primitive
(self.true_instance
)
78 self.false_instance
= new PrimitiveInstance[Bool](mainmodule
.bool_type
, false)
79 init_instance_primitive
(self.false_instance
)
81 self.null_instance
= new PrimitiveInstance[nullable Object](mainmodule
.model
.null_type
, null)
84 # Starts the interpreter on the main module of a program
85 fun start
(mainmodule
: MModule) do
86 var interpreter
= self
87 var sys_type
= mainmodule
.sys_type
88 if sys_type
== null then return # no class Sys
89 var mainobj
= new MutableInstance(sys_type
)
90 interpreter
.mainobj
= mainobj
91 interpreter
.init_instance
(mainobj
)
92 var initprop
= mainmodule
.try_get_primitive_method
("init", sys_type
.mclass
)
93 if initprop
!= null then
94 interpreter
.send
(initprop
, [mainobj
])
96 var mainprop
= mainmodule
.try_get_primitive_method
("run", sys_type
.mclass
) or else
97 mainmodule
.try_get_primitive_method
("main", sys_type
.mclass
)
98 if mainprop
!= null then
99 interpreter
.send
(mainprop
, [mainobj
])
103 # Subtype test in the context of the mainmodule
104 fun is_subtype
(sub
, sup
: MType): Bool
106 return sub
.is_subtype
(self.mainmodule
, current_receiver_class
, sup
)
109 # Get a primitive method in the context of the main module
110 fun force_get_primitive_method
(name
: String, recv
: MType): MMethod
112 assert recv
isa MClassType
113 return self.modelbuilder
.force_get_primitive_method
(current_node
, name
, recv
.mclass
, self.mainmodule
)
116 # Is a return executed?
117 # Set this mark to skip the evaluation until the end of the specified method frame
118 var returnmark
: nullable FRAME = null
120 # Is a break or a continue executed?
121 # Set this mark to skip the evaluation until a labeled statement catch it with `is_escape`
122 var escapemark
: 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 escapemark
!= 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/continue and is associated with `escapemark`, then return true and clear the mark.
134 # If there is no break/continue or if `escapemark` is null then return false.
135 # Use this function to catch a potential break/continue.
136 fun is_escape
(escapemark
: nullable EscapeMark): Bool
138 if escapemark
!= null and self.escapemark
== escapemark
then
139 self.escapemark
= null
146 # Evaluate `n` as an expression in the current context.
147 # Return the value of the expression.
148 # If `n` cannot be evaluated, then aborts.
149 fun expr
(n
: AExpr): nullable Instance
151 var frame
= self.frame
152 var old
= frame
.current_node
153 frame
.current_node
= n
154 #n.debug("IN Execute expr")
156 if i
== null and not self.is_escaping
then
157 n
.debug
("inconsitance: no value and not escaping.")
159 var implicit_cast_to
= n
.implicit_cast_to
160 if implicit_cast_to
!= null then
161 var mtype
= self.unanchor_type
(implicit_cast_to
)
162 if not self.is_subtype
(i
.mtype
, mtype
) then n
.fatal
(self, "Cast failed. Expected `{implicit_cast_to}`, got `{i.mtype}`")
165 #n.debug("OUT Execute expr: value is {i}")
166 #if not is_subtype(i.mtype, n.mtype.as(not null)) then n.debug("Expected {n.mtype.as(not null)} got {i}")
167 frame
.current_node
= old
171 # Evaluate `n` as a statement in the current context.
172 # Do nothing if `n` is null.
173 # If `n` cannot be evaluated, then aborts.
174 fun stmt
(n
: nullable AExpr)
176 if n
== null then return
178 if n
.comprehension
!= null then
179 var comprehension
= frame
.comprehension
.as(not null)
181 if i
!= null then comprehension
.add
(i
)
185 var frame
= self.frame
186 var old
= frame
.current_node
187 frame
.current_node
= n
189 frame
.current_node
= old
192 # Map used to store values of nodes that must be evaluated once in the system (`AOnceExpr`)
193 var onces
: Map[ANode, Instance] = new HashMap[ANode, Instance]
195 # Return the boolean instance associated with `val`.
196 fun bool_instance
(val
: Bool): Instance
198 if val
then return self.true_instance
else return self.false_instance
201 # Return the integer instance associated with `val`.
202 fun int_instance
(val
: Int): Instance
204 var t
= mainmodule
.int_type
205 var instance
= new PrimitiveInstance[Int](t
, val
)
206 init_instance_primitive
(instance
)
210 # Return the byte instance associated with `val`.
211 fun byte_instance
(val
: Byte): Instance
213 var t
= mainmodule
.byte_type
214 var instance
= new PrimitiveInstance[Byte](t
, val
)
215 init_instance_primitive
(instance
)
219 # Return the char instance associated with `val`.
220 fun char_instance
(val
: Char): Instance
222 var t
= mainmodule
.char_type
223 var instance
= new PrimitiveInstance[Char](t
, val
)
224 init_instance_primitive
(instance
)
228 # Return the float instance associated with `val`.
229 fun float_instance
(val
: Float): Instance
231 var t
= mainmodule
.float_type
232 var instance
= new PrimitiveInstance[Float](t
, val
)
233 init_instance_primitive
(instance
)
237 # The unique instance of the `true` value.
238 var true_instance
: Instance is noinit
240 # The unique instance of the `false` value.
241 var false_instance
: Instance is noinit
243 # The unique instance of the `null` value.
244 var null_instance
: Instance is noinit
246 # Return a new array made of `values`.
247 # The dynamic type of the result is Array[elttype].
248 fun array_instance
(values
: Array[Instance], elttype
: MType): Instance
250 assert not elttype
.need_anchor
251 var nat
= new PrimitiveInstance[Array[Instance]](mainmodule
.native_array_type
(elttype
), values
)
252 init_instance_primitive
(nat
)
253 var mtype
= mainmodule
.array_type
(elttype
)
254 var res
= new MutableInstance(mtype
)
255 self.init_instance
(res
)
256 self.send
(self.force_get_primitive_method
("with_native", mtype
), [res
, nat
, self.int_instance
(values
.length
)])
260 # Return a instance associated to a primitive class
261 # Current primitive classes are `Int`, `Bool`, and `String`
262 fun value_instance
(object
: Object): Instance
264 if object
isa Int then
265 return int_instance
(object
)
266 else if object
isa Bool then
267 return bool_instance
(object
)
268 else if object
isa String then
269 return string_instance
(object
)
275 # Return a new native string initialized with `txt`
276 fun native_string_instance
(txt
: String): Instance
278 var instance
= native_string_instance_len
(txt
.length
+1)
279 var val
= instance
.val
280 val
[txt
.length
] = '\0'
281 txt
.to_cstring
.copy_to
(val
, txt
.length
, 0, 0)
286 # Return a new native string initialized of `length`
287 fun native_string_instance_len
(length
: Int): PrimitiveInstance[NativeString]
289 var val
= new NativeString(length
)
291 var t
= mainmodule
.native_string_type
292 var instance
= new PrimitiveInstance[NativeString](t
, val
)
293 init_instance_primitive
(instance
)
297 # Return a new String instance for `txt`
298 fun string_instance
(txt
: String): Instance
300 var nat
= native_string_instance
(txt
)
301 var res
= self.send
(self.force_get_primitive_method
("to_s_with_length", nat
.mtype
), [nat
, self.int_instance
(txt
.length
)])
306 # The virtual type of the frames used in the execution engine
309 # The current frame used to store local variables of the current method executed
310 fun frame
: FRAME do return frames
.first
312 # The stack of all frames. The first one is the current one.
313 var frames
= new List[FRAME]
315 # Return a stack trace. One line per function
316 fun stack_trace
: String
318 var b
= new FlatBuffer
319 b
.append
(",---- Stack trace -- - - -\n")
321 b
.append
("| {f.mpropdef} ({f.current_node.location})\n")
323 b
.append
("`------------------- - - -")
327 # The current node, used to print errors, debug and stack-traces
328 fun current_node
: nullable ANode
330 if frames
.is_empty
then return null
331 return frames
.first
.current_node
334 # The dynamic type of the current `self`
335 fun current_receiver_class
: MClassType
337 return frames
.first
.arguments
.first
.mtype
.as(MClassType)
340 # Initialize the environment for a call and return a new Frame
341 # *`node` The AST node
342 # *`mpropdef` The corresponding mpropdef
343 # *`args` Arguments of the call
344 fun new_frame
(node
: ANode, mpropdef
: MPropDef, args
: Array[Instance]): FRAME
346 return new InterpreterFrame(node
, mpropdef
, args
)
349 # Exit the program with a message
350 fun fatal
(message
: String)
352 var node
= current_node
356 node
.fatal
(self, message
)
361 # Debug on the current node
362 fun debug
(message
: String)
364 var node
= current_node
372 # Retrieve the value of the variable in the current frame
373 fun read_variable
(v
: Variable): Instance
375 var f
= frames
.first
.as(InterpreterFrame)
379 # Assign the value of the variable in the current frame
380 fun write_variable
(v
: Variable, value
: Instance)
382 var f
= frames
.first
.as(InterpreterFrame)
386 # Store known methods, used to trace methods as they are reached
387 var discover_call_trace
: Set[MMethodDef] = new HashSet[MMethodDef]
389 # Evaluate `args` as expressions in the call of `mpropdef` on `recv`.
390 # This method is used to manage varargs in signatures and returns the real array
391 # of instances to use in the call.
392 # Return `null` if one of the evaluation of the arguments return null.
393 fun varargize
(mpropdef
: MMethodDef, map
: nullable SignatureMap, recv
: Instance, args
: SequenceRead[AExpr]): nullable Array[Instance]
395 var msignature
= mpropdef
.new_msignature
or else mpropdef
.msignature
.as(not null)
396 var res
= new Array[Instance]
399 if msignature
.arity
== 0 then return res
402 assert args
.length
== msignature
.arity
else debug
("Expected {msignature.arity} args, got {args.length}")
404 var e
= self.expr
(ne
)
405 if e
== null then return null
411 # Eval in order of arguments, not parameters
412 var exprs
= new Array[Instance].with_capacity
(args
.length
)
414 var e
= self.expr
(ne
)
415 if e
== null then return null
420 # Fill `res` with the result of the evaluation according to the mapping
421 for i
in [0..msignature
.arity
[ do
422 var param
= msignature
.mparameters
[i
]
423 var j
= map
.map
.get_or_null
(i
)
426 res
.add
(null_instance
)
429 if param
.is_vararg
and map
.vararg_decl
> 0 then
430 var vararg
= exprs
.sub
(j
, map
.vararg_decl
)
431 var elttype
= param
.mtype
.anchor_to
(self.mainmodule
, recv
.mtype
.as(MClassType))
432 var arg
= self.array_instance
(vararg
, elttype
)
441 # Execute `mpropdef` for a `args` (where `args[0]` is the receiver).
442 # Return a value if `mpropdef` is a function, or null if it is a procedure.
443 # The call is direct/static. There is no message-sending/late-binding.
444 fun call
(mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
446 if self.modelbuilder
.toolcontext
.opt_discover_call_trace
.value
and not self.discover_call_trace
.has
(mpropdef
) then
447 self.discover_call_trace
.add mpropdef
448 self.debug
("Discovered {mpropdef}")
450 assert args
.length
== mpropdef
.msignature
.arity
+ 1 else debug
("Invalid arity for {mpropdef}. {args.length} arguments given.")
452 # Look for the AST node that implements the property
453 var val
= mpropdef
.constant_value
455 var node
= modelbuilder
.mpropdef2node
(mpropdef
)
456 if mpropdef
.is_abstract
then
458 self.frames
.unshift new_frame
(node
, mpropdef
, args
)
460 fatal
("Abstract method `{mpropdef.mproperty.name}` called on `{args.first.mtype}`")
464 if node
isa APropdef then
465 self.parameter_check
(node
, mpropdef
, args
)
466 return node
.call
(self, mpropdef
, args
)
467 else if node
isa AClassdef then
468 self.parameter_check
(node
, mpropdef
, args
)
469 return node
.call
(self, mpropdef
, args
)
470 else if node
!= null then
471 fatal
("Fatal Error: method {mpropdef} associated to unexpected AST node {node.location}")
473 else if val
!= null then
474 return value_instance
(val
)
476 fatal
("Fatal Error: method {mpropdef} not found in the AST")
481 # Execute type checks of covariant parameters
482 fun parameter_check
(node
: ANode, mpropdef
: MMethodDef, args
: Array[Instance])
484 var msignature
= mpropdef
.msignature
485 for i
in [0..msignature
.arity
[ do
486 # skip test for vararg since the array is instantiated with the correct polymorphic type
487 if msignature
.vararg_rank
== i
then continue
489 # skip if the cast is not required
490 var origmtype
= mpropdef
.mproperty
.intro
.msignature
.mparameters
[i
].mtype
491 if not origmtype
.need_anchor
then continue
493 #print "{mpropdef}: {mpropdef.mproperty.intro.msignature.mparameters[i]}"
495 # get the parameter type
496 var mtype
= msignature
.mparameters
[i
].mtype
497 var anchor
= args
.first
.mtype
.as(MClassType)
498 var amtype
= mtype
.anchor_to
(self.mainmodule
, anchor
)
499 if not args
[i
+1].mtype
.is_subtype
(self.mainmodule
, anchor
, amtype
) then
500 node
.fatal
(self, "Cast failed. Expected `{mtype}`, got `{args[i+1].mtype}`")
505 # Common code for runtime injected calls and normal calls
506 fun send_commons
(mproperty
: MMethod, args
: Array[Instance], mtype
: MType): nullable Instance
508 if mtype
isa MNullType then
509 if mproperty
.name
== "==" or mproperty
.name
== "is_same_instance" then
510 return self.bool_instance
(args
[0] == args
[1])
511 else if mproperty
.name
== "!=" then
512 return self.bool_instance
(args
[0] != args
[1])
514 #fatal("Receiver is null. {mproperty}. {args.join(" ")} {self.frame.current_node.class_name}")
515 fatal
("Receiver is null")
520 # Execute a full `callsite` for given `args`
521 # Use this method, instead of `send` to execute and control the additional behavior of the call-sites
522 fun callsite
(callsite
: nullable CallSite, arguments
: Array[Instance]): nullable Instance
524 var initializers
= callsite
.mpropdef
.initializers
525 if not initializers
.is_empty
then
526 var recv
= arguments
.first
528 for p
in initializers
do
529 if p
isa MMethod then
531 for x
in p
.intro
.msignature
.mparameters
do
532 args
.add arguments
[i
]
536 else if p
isa MAttribute then
537 assert recv
isa MutableInstance
538 write_attribute
(p
, recv
, arguments
[i
])
542 assert i
== arguments
.length
544 return send
(callsite
.mproperty
, [recv
])
546 return send
(callsite
.mproperty
, arguments
)
549 # Execute `mproperty` for a `args` (where `args[0]` is the receiver).
550 # Return a value if `mproperty` is a function, or null if it is a procedure.
551 # The call is polymorphic. There is a message-sending/late-binding according to the receiver (args[0]).
552 fun send
(mproperty
: MMethod, args
: Array[Instance]): nullable Instance
554 var recv
= args
.first
555 var mtype
= recv
.mtype
556 var ret
= send_commons
(mproperty
, args
, mtype
)
557 if ret
!= null then return ret
558 var propdef
= mproperty
.lookup_first_definition
(self.mainmodule
, mtype
)
559 return self.call
(propdef
, args
)
562 # Read the attribute `mproperty` of an instance `recv` and return its value.
563 # If the attribute in not yet initialized, then aborts with an error message.
564 fun read_attribute
(mproperty
: MAttribute, recv
: Instance): Instance
566 assert recv
isa MutableInstance
567 if not recv
.attributes
.has_key
(mproperty
) then
568 fatal
("Uninitialized attribute {mproperty.name}")
571 return recv
.attributes
[mproperty
]
574 # Replace in `recv` the value of the attribute `mproperty` by `value`
575 fun write_attribute
(mproperty
: MAttribute, recv
: Instance, value
: Instance)
577 assert recv
isa MutableInstance
578 recv
.attributes
[mproperty
] = value
581 # Is the attribute `mproperty` initialized the instance `recv`?
582 fun isset_attribute
(mproperty
: MAttribute, recv
: Instance): Bool
584 assert recv
isa MutableInstance
585 return recv
.attributes
.has_key
(mproperty
)
588 # Collect attributes of a type in the order of their init
589 fun collect_attr_propdef
(mtype
: MType): Array[AAttrPropdef]
591 var cache
= self.collect_attr_propdef_cache
592 if cache
.has_key
(mtype
) then return cache
[mtype
]
594 var res
= new Array[AAttrPropdef]
595 var cds
= mtype
.collect_mclassdefs
(self.mainmodule
).to_a
596 self.mainmodule
.linearize_mclassdefs
(cds
)
598 res
.add_all
(modelbuilder
.collect_attr_propdef
(cd
))
605 private var collect_attr_propdef_cache
= new HashMap[MType, Array[AAttrPropdef]]
607 # Fill the initial values of the newly created instance `recv`.
608 # `recv.mtype` is used to know what must be filled.
609 fun init_instance
(recv
: Instance)
611 for npropdef
in collect_attr_propdef
(recv
.mtype
) do
612 npropdef
.init_expr
(self, recv
)
616 # A hook to initialize a `PrimitiveInstance`
617 fun init_instance_primitive
(recv
: Instance) do end
619 # This function determines the correct type according to the receiver of the current propdef (self).
620 fun unanchor_type
(mtype
: MType): MType
622 return mtype
.anchor_to
(self.mainmodule
, current_receiver_class
)
625 # Placebo instance used to mark internal error result when `null` already have a meaning.
626 # TODO: replace with multiple return or something better
627 var error_instance
= new MutableInstance(modelbuilder
.model
.null_type
) is lazy
630 # An instance represents a value of the executed program.
631 abstract class Instance
632 # The dynamic type of the instance
633 # ASSERT: not self.mtype.is_anchored
636 # return true if the instance is the true value.
637 # return false if the instance is the true value.
639 fun is_true
: Bool do abort
641 # Return true if `self` IS `o` (using the Nit semantic of is)
642 fun eq_is
(o
: Instance): Bool do return self.is_same_instance
(o
)
644 # Human readable object identity "Type#number"
645 redef fun to_s
do return "{mtype}"
647 # Return the integer value if the instance is an integer.
649 fun to_i
: Int do abort
651 # Return the integer value if the instance is a float.
653 fun to_f
: Float do abort
655 # Return the integer value if the instance is a byte.
657 fun to_b
: Byte do abort
659 # The real value encapsulated if the instance is primitive.
661 fun val
: nullable Object do abort
664 # A instance with attribute (standards objects)
665 class MutableInstance
668 # The values of the attributes
669 var attributes
: Map[MAttribute, Instance] = new HashMap[MAttribute, Instance]
672 # Special instance to handle primitives values (int, bool, etc.)
673 # The trick it just to encapsulate the <<real>> value
674 class PrimitiveInstance[E
]
677 # The real value encapsulated
682 if val
== true then return true
683 if val
== false then return false
689 if not o
isa PrimitiveInstance[nullable Object] then return false
690 return self.val
== o
.val
695 if not o
isa PrimitiveInstance[nullable Object] then return false
696 return self.val
.is_same_instance
(o
.val
)
699 redef fun to_s
do return "{mtype}#{val.object_id}({val or else "null"})"
701 redef fun to_i
do return val
.as(Int)
703 redef fun to_f
do return val
.as(Float)
705 redef fun to_b
do return val
.as(Byte)
708 # Information about local variables in a running method
710 # The current visited node
711 # The node is stored by frame to keep a stack trace
712 var current_node
: ANode
713 # The executed property.
714 # A Method in case of a call, an attribute in case of a default initialization.
715 var mpropdef
: MPropDef
716 # Arguments of the method (the first is the receiver)
717 var arguments
: Array[Instance]
718 # Indicate if the expression has an array comprehension form
719 var comprehension
: nullable Array[Instance] = null
722 # Implementation of a Frame with a Hashmap to store local variables
723 class InterpreterFrame
726 # Mapping between a variable and the current value
727 private var map
: Map[Variable, Instance] = new HashMap[Variable, Instance]
731 # Aborts the program with a message
732 # `v` is used to know if a colored message is displayed or not
733 fun fatal
(v
: NaiveInterpreter, message
: String)
735 if v
.modelbuilder
.toolcontext
.opt_no_color
.value
== true then
736 sys
.stderr
.write
("Runtime error: {message} ({location.file.filename}:{location.line_start})\n")
738 sys
.stderr
.write
("{location}: Runtime error: {message}\n{location.colored_line("0;31")}\n")
739 sys
.stderr
.write
(v
.stack_trace
)
740 sys
.stderr
.write
("\n")
747 # Execute a `mpropdef` associated with the current node.
748 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
750 fatal
(v
, "NOT YET IMPLEMENTED method kind {class_name}. {mpropdef}")
755 redef class AMethPropdef
758 redef fun call
(v
, mpropdef
, args
)
760 var f
= v
.new_frame
(self, mpropdef
, args
)
761 var res
= call_commons
(v
, mpropdef
, args
, f
)
763 if v
.returnmark
== f
then
772 private fun call_commons
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
776 for i
in [0..mpropdef
.msignature
.arity
[ do
777 var variable
= self.n_signature
.n_params
[i
].variable
778 assert variable
!= null
779 v
.write_variable
(variable
, arguments
[i
+1])
782 # Call the implicit super-init
783 var auto_super_inits
= self.auto_super_inits
784 if auto_super_inits
!= null then
785 var args
= [arguments
.first
]
786 for auto_super_init
in auto_super_inits
do
788 for i
in [0..auto_super_init
.msignature
.arity
+1[ do
789 args
.add
(arguments
[i
])
791 assert auto_super_init
.mproperty
!= mpropdef
.mproperty
792 v
.callsite
(auto_super_init
, args
)
795 if auto_super_call
then
796 # standard call-next-method
797 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, arguments
.first
.mtype
)
798 v
.call
(superpd
, arguments
)
801 if mpropdef
.is_intern
or mpropdef
.is_extern
then
802 var res
= intern_call
(v
, mpropdef
, arguments
)
803 if res
!= v
.error_instance
then return res
806 if n_block
!= null then
811 if mpropdef
.is_intern
then
812 fatal
(v
, "NOT YET IMPLEMENTED intern {mpropdef}")
813 else if mpropdef
.is_extern
then
814 var res
= call_extern
(v
, mpropdef
, arguments
, f
)
815 if res
!= v
.error_instance
then return res
817 fatal
(v
, "NOT YET IMPLEMENTED <wat?> {mpropdef}")
822 # Call this extern method
823 protected fun call_extern
(v
: NaiveInterpreter, mpropdef
: MMethodDef, arguments
: Array[Instance], f
: Frame): nullable Instance
825 fatal
(v
, "NOT YET IMPLEMENTED extern {mpropdef}")
826 return v
.error_instance
829 # Interprets a intern or a shortcut extern method.
830 # Returns the result for a function, `null` for a procedure, or `error_instance` if the method is unknown.
831 private fun intern_call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
833 var pname
= mpropdef
.mproperty
.name
834 var cname
= mpropdef
.mclassdef
.mclass
.name
835 if pname
== "output" then
836 var recv
= args
.first
839 else if pname
== "object_id" then
840 var recv
= args
.first
841 if recv
isa PrimitiveInstance[Object] then
842 return v
.int_instance
(recv
.val
.object_id
)
844 return v
.int_instance
(recv
.object_id
)
846 else if pname
== "output_class_name" then
847 var recv
= args
.first
850 else if pname
== "native_class_name" then
851 var recv
= args
.first
852 var txt
= recv
.mtype
.to_s
853 return v
.native_string_instance
(txt
)
854 else if pname
== "==" then
855 # == is correctly redefined for instances
856 return v
.bool_instance
(args
[0] == args
[1])
857 else if pname
== "!=" then
858 return v
.bool_instance
(args
[0] != args
[1])
859 else if pname
== "is_same_type" then
860 return v
.bool_instance
(args
[0].mtype
== args
[1].mtype
)
861 else if pname
== "is_same_instance" then
862 return v
.bool_instance
(args
[0].eq_is
(args
[1]))
863 else if pname
== "exit" then
866 else if pname
== "buffer_mode_full" then
867 return v
.int_instance
(sys
.buffer_mode_full
)
868 else if pname
== "buffer_mode_line" then
869 return v
.int_instance
(sys
.buffer_mode_line
)
870 else if pname
== "buffer_mode_none" then
871 return v
.int_instance
(sys
.buffer_mode_none
)
872 else if pname
== "sys" then
874 else if cname
== "Int" then
875 var recvval
= args
[0].to_i
876 if pname
== "unary -" then
877 return v
.int_instance
(-args
[0].to_i
)
878 else if pname
== "unary +" then
880 else if pname
== "+" then
881 return v
.int_instance
(args
[0].to_i
+ args
[1].to_i
)
882 else if pname
== "-" then
883 return v
.int_instance
(args
[0].to_i
- args
[1].to_i
)
884 else if pname
== "*" then
885 return v
.int_instance
(args
[0].to_i
* args
[1].to_i
)
886 else if pname
== "%" then
887 return v
.int_instance
(args
[0].to_i
% args
[1].to_i
)
888 else if pname
== "/" then
889 return v
.int_instance
(args
[0].to_i
/ args
[1].to_i
)
890 else if pname
== "<" then
891 return v
.bool_instance
(args
[0].to_i
< args
[1].to_i
)
892 else if pname
== ">" then
893 return v
.bool_instance
(args
[0].to_i
> args
[1].to_i
)
894 else if pname
== "<=" then
895 return v
.bool_instance
(args
[0].to_i
<= args
[1].to_i
)
896 else if pname
== ">=" then
897 return v
.bool_instance
(args
[0].to_i
>= args
[1].to_i
)
898 else if pname
== "<=>" then
899 return v
.int_instance
(args
[0].to_i
<=> args
[1].to_i
)
900 else if pname
== "ascii" then
901 return v
.char_instance
(args
[0].to_i
.ascii
)
902 else if pname
== "to_f" then
903 return v
.float_instance
(args
[0].to_i
.to_f
)
904 else if pname
== "to_b" then
905 return v
.byte_instance
(args
[0].to_i
.to_b
)
906 else if pname
== "lshift" then
907 return v
.int_instance
(args
[0].to_i
.lshift
(args
[1].to_i
))
908 else if pname
== "rshift" then
909 return v
.int_instance
(args
[0].to_i
.rshift
(args
[1].to_i
))
910 else if pname
== "rand" then
911 var res
= recvval
.rand
912 return v
.int_instance
(res
)
913 else if pname
== "bin_and" then
914 return v
.int_instance
(args
[0].to_i
.bin_and
(args
[1].to_i
))
915 else if pname
== "bin_or" then
916 return v
.int_instance
(args
[0].to_i
.bin_or
(args
[1].to_i
))
917 else if pname
== "bin_xor" then
918 return v
.int_instance
(args
[0].to_i
.bin_xor
(args
[1].to_i
))
919 else if pname
== "bin_not" then
920 return v
.int_instance
(args
[0].to_i
.bin_not
)
922 else if cname
== "Byte" then
923 var recvval
= args
[0].to_b
924 if pname
== "unary -" then
925 return v
.byte_instance
(-args
[0].to_b
)
926 else if pname
== "unary +" then
928 else if pname
== "+" then
929 return v
.byte_instance
(args
[0].to_b
+ args
[1].to_b
)
930 else if pname
== "-" then
931 return v
.byte_instance
(args
[0].to_b
- args
[1].to_b
)
932 else if pname
== "*" then
933 return v
.byte_instance
(args
[0].to_b
* args
[1].to_b
)
934 else if pname
== "%" then
935 return v
.byte_instance
(args
[0].to_b
% args
[1].to_b
)
936 else if pname
== "/" then
937 return v
.byte_instance
(args
[0].to_b
/ args
[1].to_b
)
938 else if pname
== "<" then
939 return v
.bool_instance
(args
[0].to_b
< args
[1].to_b
)
940 else if pname
== ">" then
941 return v
.bool_instance
(args
[0].to_b
> args
[1].to_b
)
942 else if pname
== "<=" then
943 return v
.bool_instance
(args
[0].to_b
<= args
[1].to_b
)
944 else if pname
== ">=" then
945 return v
.bool_instance
(args
[0].to_b
>= args
[1].to_b
)
946 else if pname
== "<=>" then
947 return v
.int_instance
(args
[0].to_b
<=> args
[1].to_b
)
948 else if pname
== "to_f" then
949 return v
.float_instance
(args
[0].to_b
.to_f
)
950 else if pname
== "to_i" then
951 return v
.int_instance
(args
[0].to_b
.to_i
)
952 else if pname
== "lshift" then
953 return v
.byte_instance
(args
[0].to_b
.lshift
(args
[1].to_i
))
954 else if pname
== "rshift" then
955 return v
.byte_instance
(args
[0].to_b
.rshift
(args
[1].to_i
))
956 else if pname
== "byte_to_s_len" then
957 return v
.int_instance
(recvval
.to_s
.length
)
959 else if cname
== "Char" then
960 var recv
= args
[0].val
.as(Char)
961 if pname
== "ascii" then
962 return v
.int_instance
(recv
.ascii
)
963 else if pname
== "successor" then
964 return v
.char_instance
(recv
.successor
(args
[1].to_i
))
965 else if pname
== "predecessor" then
966 return v
.char_instance
(recv
.predecessor
(args
[1].to_i
))
967 else if pname
== "<" then
968 return v
.bool_instance
(recv
< args
[1].val
.as(Char))
969 else if pname
== ">" then
970 return v
.bool_instance
(recv
> args
[1].val
.as(Char))
971 else if pname
== "<=" then
972 return v
.bool_instance
(recv
<= args
[1].val
.as(Char))
973 else if pname
== ">=" then
974 return v
.bool_instance
(recv
>= args
[1].val
.as(Char))
975 else if pname
== "<=>" then
976 return v
.int_instance
(recv
<=> args
[1].val
.as(Char))
978 else if cname
== "Float" then
979 var recv
= args
[0].to_f
980 if pname
== "unary -" then
981 return v
.float_instance
(-recv
)
982 else if pname
== "unary +" then
984 else if pname
== "+" then
985 return v
.float_instance
(recv
+ args
[1].to_f
)
986 else if pname
== "-" then
987 return v
.float_instance
(recv
- args
[1].to_f
)
988 else if pname
== "*" then
989 return v
.float_instance
(recv
* args
[1].to_f
)
990 else if pname
== "/" then
991 return v
.float_instance
(recv
/ args
[1].to_f
)
992 else if pname
== "<" then
993 return v
.bool_instance
(recv
< args
[1].to_f
)
994 else if pname
== ">" then
995 return v
.bool_instance
(recv
> args
[1].to_f
)
996 else if pname
== "<=" then
997 return v
.bool_instance
(recv
<= args
[1].to_f
)
998 else if pname
== ">=" then
999 return v
.bool_instance
(recv
>= args
[1].to_f
)
1000 else if pname
== "to_i" then
1001 return v
.int_instance
(recv
.to_i
)
1002 else if pname
== "to_b" then
1003 return v
.byte_instance
(recv
.to_b
)
1004 else if pname
== "cos" then
1005 return v
.float_instance
(args
[0].to_f
.cos
)
1006 else if pname
== "sin" then
1007 return v
.float_instance
(args
[0].to_f
.sin
)
1008 else if pname
== "tan" then
1009 return v
.float_instance
(args
[0].to_f
.tan
)
1010 else if pname
== "acos" then
1011 return v
.float_instance
(args
[0].to_f
.acos
)
1012 else if pname
== "asin" then
1013 return v
.float_instance
(args
[0].to_f
.asin
)
1014 else if pname
== "atan" then
1015 return v
.float_instance
(args
[0].to_f
.atan
)
1016 else if pname
== "sqrt" then
1017 return v
.float_instance
(args
[0].to_f
.sqrt
)
1018 else if pname
== "exp" then
1019 return v
.float_instance
(args
[0].to_f
.exp
)
1020 else if pname
== "log" then
1021 return v
.float_instance
(args
[0].to_f
.log
)
1022 else if pname
== "pow" then
1023 return v
.float_instance
(args
[0].to_f
.pow
(args
[1].to_f
))
1024 else if pname
== "rand" then
1025 return v
.float_instance
(args
[0].to_f
.rand
)
1026 else if pname
== "abs" then
1027 return v
.float_instance
(args
[0].to_f
.abs
)
1028 else if pname
== "hypot_with" then
1029 return v
.float_instance
(args
[0].to_f
.hypot_with
(args
[1].to_f
))
1030 else if pname
== "is_nan" then
1031 return v
.bool_instance
(args
[0].to_f
.is_nan
)
1032 else if pname
== "is_inf_extern" then
1033 return v
.bool_instance
(args
[0].to_f
.is_inf
!= 0)
1034 else if pname
== "round" then
1035 return v
.float_instance
(args
[0].to_f
.round
)
1037 else if cname
== "NativeString" then
1038 if pname
== "new" then
1039 return v
.native_string_instance_len
(args
[1].to_i
)
1041 var recvval
= args
.first
.val
.as(NativeString)
1042 if pname
== "[]" then
1043 var arg1
= args
[1].to_i
1044 return v
.char_instance
(recvval
[arg1
])
1045 else if pname
== "[]=" then
1046 var arg1
= args
[1].to_i
1047 recvval
[arg1
] = args
[2].val
.as(Char)
1049 else if pname
== "copy_to" then
1050 # sig= copy_to(dest: NativeString, length: Int, from: Int, to: Int)
1051 var destval
= args
[1].val
.as(NativeString)
1052 var lenval
= args
[2].to_i
1053 var fromval
= args
[3].to_i
1054 var toval
= args
[4].to_i
1055 recvval
.copy_to
(destval
, lenval
, fromval
, toval
)
1057 else if pname
== "atoi" then
1058 return v
.int_instance
(recvval
.atoi
)
1059 else if pname
== "fast_cstring" then
1060 var ns
= recvval
.to_s
.substring_from
(args
[1].to_i
)
1061 return v
.native_string_instance
(ns
)
1063 else if pname
== "calloc_string" then
1064 return v
.native_string_instance_len
(args
[1].to_i
)
1065 else if cname
== "NativeArray" then
1066 if pname
== "new" then
1067 var val
= new Array[Instance].filled_with
(v
.null_instance
, args
[1].to_i
)
1068 var instance
= new PrimitiveInstance[Array[Instance]](args
[0].mtype
, val
)
1069 v
.init_instance_primitive
(instance
)
1072 var recvval
= args
.first
.val
.as(Array[Instance])
1073 if pname
== "[]" then
1074 return recvval
[args
[1].to_i
]
1075 else if pname
== "[]=" then
1076 recvval
[args
[1].to_i
] = args
[2]
1078 else if pname
== "length" then
1079 return v
.int_instance
(recvval
.length
)
1080 else if pname
== "copy_to" then
1081 recvval
.copy_to
(0, args
[2].to_i
, args
[1].val
.as(Array[Instance]), 0)
1084 else if pname
== "native_argc" then
1085 return v
.int_instance
(v
.arguments
.length
)
1086 else if pname
== "native_argv" then
1087 var txt
= v
.arguments
[args
[1].to_i
]
1088 return v
.native_string_instance
(txt
)
1089 else if pname
== "native_argc" then
1090 return v
.int_instance
(v
.arguments
.length
)
1091 else if pname
== "native_argv" then
1092 var txt
= v
.arguments
[args
[1].to_i
]
1093 return v
.native_string_instance
(txt
)
1094 else if pname
== "lexer_goto" then
1095 return v
.int_instance
(lexer_goto
(args
[1].to_i
, args
[2].to_i
))
1096 else if pname
== "lexer_accept" then
1097 return v
.int_instance
(lexer_accept
(args
[1].to_i
))
1098 else if pname
== "parser_goto" then
1099 return v
.int_instance
(parser_goto
(args
[1].to_i
, args
[2].to_i
))
1100 else if pname
== "parser_action" then
1101 return v
.int_instance
(parser_action
(args
[1].to_i
, args
[2].to_i
))
1103 return v
.error_instance
1107 redef class AAttrPropdef
1108 redef fun call
(v
, mpropdef
, args
)
1110 var recv
= args
.first
1111 assert recv
isa MutableInstance
1112 var attr
= self.mpropdef
.mproperty
1113 if mpropdef
== mreadpropdef
then
1114 assert args
.length
== 1
1115 if not is_lazy
or v
.isset_attribute
(attr
, recv
) then return v
.read_attribute
(attr
, recv
)
1116 var f
= v
.new_frame
(self, mpropdef
, args
)
1117 return evaluate_expr
(v
, recv
, f
)
1118 else if mpropdef
== mwritepropdef
then
1119 assert args
.length
== 2
1120 v
.write_attribute
(attr
, recv
, args
[1])
1127 # Evaluate and set the default value of the attribute in `recv`
1128 private fun init_expr
(v
: NaiveInterpreter, recv
: Instance)
1130 if is_lazy
then return
1132 var f
= v
.new_frame
(self, mreadpropdef
.as(not null), [recv
])
1133 evaluate_expr
(v
, recv
, f
)
1136 var mpropdef
= self.mpropdef
1137 if mpropdef
== null then return
1138 var mtype
= self.mtype
.as(not null)
1139 mtype
= mtype
.anchor_to
(v
.mainmodule
, recv
.mtype
.as(MClassType))
1140 if mtype
isa MNullableType then
1141 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, v
.null_instance
)
1145 private fun evaluate_expr
(v
: NaiveInterpreter, recv
: Instance, f
: Frame): Instance
1147 assert recv
isa MutableInstance
1152 var nexpr
= self.n_expr
1153 var nblock
= self.n_block
1154 if nexpr
!= null then
1156 else if nblock
!= null then
1158 assert v
.returnmark
== f
1161 v
.escapevalue
= null
1168 assert not v
.is_escaping
1169 v
.write_attribute
(self.mpropdef
.mproperty
, recv
, val
)
1174 redef class AClassdef
1175 # Execute an implicit `mpropdef` associated with the current node.
1176 private fun call
(v
: NaiveInterpreter, mpropdef
: MMethodDef, args
: Array[Instance]): nullable Instance
1178 if mpropdef
.mproperty
.is_root_init
then
1179 assert args
.length
== 1
1180 if not mpropdef
.is_intro
then
1181 # standard call-next-method
1182 var superpd
= mpropdef
.lookup_next_definition
(v
.mainmodule
, args
.first
.mtype
)
1183 v
.call
(superpd
, args
)
1193 # Evaluate the node as a possible expression.
1194 # Return a possible value
1195 # NOTE: Do not call this method directly, but use `v.expr`
1196 # This method is here to be implemented by subclasses.
1197 protected fun expr
(v
: NaiveInterpreter): nullable Instance
1199 fatal
(v
, "NOT YET IMPLEMENTED expr {class_name}")
1203 # Evaluate the node as a statement.
1204 # NOTE: Do not call this method directly, but use `v.stmt`
1205 # This method is here to be implemented by subclasses (no need to return something).
1206 protected fun stmt
(v
: NaiveInterpreter)
1213 redef class ABlockExpr
1216 var last
= self.n_expr
.last
1217 for e
in self.n_expr
do
1218 if e
== last
then break
1220 if v
.is_escaping
then return null
1227 for e
in self.n_expr
do
1229 if v
.is_escaping
then return
1234 redef class AVardeclExpr
1237 var ne
= self.n_expr
1240 if i
== null then return null
1241 v
.write_variable
(self.variable
.as(not null), i
)
1248 redef class AVarExpr
1251 return v
.read_variable
(self.variable
.as(not null))
1255 redef class AVarAssignExpr
1258 var i
= v
.expr
(self.n_value
)
1259 if i
== null then return null
1260 v
.write_variable
(self.variable
.as(not null), i
)
1265 redef class AVarReassignExpr
1268 var variable
= self.variable
.as(not null)
1269 var vari
= v
.read_variable
(variable
)
1270 var value
= v
.expr
(self.n_value
)
1271 if value
== null then return
1272 var res
= v
.callsite
(reassign_callsite
, [vari
, value
])
1274 v
.write_variable
(variable
, res
)
1278 redef class ASelfExpr
1281 return v
.frame
.arguments
.first
1285 redef class AImplicitSelfExpr
1288 if not is_sys
then return super
1293 redef class AEscapeExpr
1296 var ne
= self.n_expr
1299 if i
== null then return
1302 v
.escapemark
= self.escapemark
1306 redef class AReturnExpr
1309 var ne
= self.n_expr
1312 if i
== null then return
1315 v
.returnmark
= v
.frame
1319 redef class AAbortExpr
1330 var cond
= v
.expr
(self.n_expr
)
1331 if cond
== null then return null
1332 if cond
.is_true
then
1333 return v
.expr
(self.n_then
.as(not null))
1335 return v
.expr
(self.n_else
.as(not null))
1341 var cond
= v
.expr
(self.n_expr
)
1342 if cond
== null then return
1343 if cond
.is_true
then
1351 redef class AIfexprExpr
1354 var cond
= v
.expr
(self.n_expr
)
1355 if cond
== null then return null
1356 if cond
.is_true
then
1357 return v
.expr
(self.n_then
)
1359 return v
.expr
(self.n_else
)
1367 v
.stmt
(self.n_block
)
1368 v
.is_escape
(self.break_mark
) # Clear the break (if any)
1372 redef class AWhileExpr
1376 var cond
= v
.expr
(self.n_expr
)
1377 if cond
== null then return
1378 if not cond
.is_true
then return
1379 v
.stmt
(self.n_block
)
1380 if v
.is_escape
(self.break_mark
) then return
1381 v
.is_escape
(self.continue_mark
) # Clear the break
1382 if v
.is_escaping
then return
1387 redef class ALoopExpr
1391 v
.stmt
(self.n_block
)
1392 if v
.is_escape
(self.break_mark
) then return
1393 v
.is_escape
(self.continue_mark
) # Clear the break
1394 if v
.is_escaping
then return
1399 redef class AForExpr
1402 var col
= v
.expr
(self.n_expr
)
1403 if col
== null then return
1404 if col
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1406 #self.debug("col {col}")
1407 var iter
= v
.callsite
(method_iterator
, [col
]).as(not null)
1408 #self.debug("iter {iter}")
1410 var isok
= v
.callsite
(method_is_ok
, [iter
]).as(not null)
1411 if not isok
.is_true
then break
1412 if self.variables
.length
== 1 then
1413 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1414 #self.debug("item {item}")
1415 v
.write_variable
(self.variables
.first
, item
)
1416 else if self.variables
.length
== 2 then
1417 var key
= v
.callsite
(method_key
, [iter
]).as(not null)
1418 v
.write_variable
(self.variables
[0], key
)
1419 var item
= v
.callsite
(method_item
, [iter
]).as(not null)
1420 v
.write_variable
(self.variables
[1], item
)
1424 v
.stmt
(self.n_block
)
1425 if v
.is_escape
(self.break_mark
) then break
1426 v
.is_escape
(self.continue_mark
) # Clear the break
1427 if v
.is_escaping
then break
1428 v
.callsite
(method_next
, [iter
])
1430 var method_finish
= self.method_finish
1431 if method_finish
!= null then
1432 v
.callsite
(method_finish
, [iter
])
1437 redef class AWithExpr
1440 var expr
= v
.expr
(self.n_expr
)
1441 if expr
== null then return
1443 v
.callsite
(method_start
, [expr
])
1444 v
.stmt
(self.n_block
)
1445 v
.is_escape
(self.break_mark
) # Clear the break
1446 v
.callsite
(method_finish
, [expr
])
1450 redef class AAssertExpr
1453 var cond
= v
.expr
(self.n_expr
)
1454 if cond
== null then return
1455 if not cond
.is_true
then
1457 if v
.is_escaping
then return
1460 fatal
(v
, "Assert '{nid.text}' failed")
1462 fatal
(v
, "Assert failed")
1472 var cond
= v
.expr
(self.n_expr
)
1473 if cond
== null then return null
1474 if cond
.is_true
then return cond
1475 return v
.expr
(self.n_expr2
)
1479 redef class AImpliesExpr
1482 var cond
= v
.expr
(self.n_expr
)
1483 if cond
== null then return null
1484 if not cond
.is_true
then return v
.true_instance
1485 return v
.expr
(self.n_expr2
)
1489 redef class AAndExpr
1492 var cond
= v
.expr
(self.n_expr
)
1493 if cond
== null then return null
1494 if not cond
.is_true
then return cond
1495 return v
.expr
(self.n_expr2
)
1499 redef class ANotExpr
1502 var cond
= v
.expr
(self.n_expr
)
1503 if cond
== null then return null
1504 return v
.bool_instance
(not cond
.is_true
)
1508 redef class AOrElseExpr
1511 var i
= v
.expr
(self.n_expr
)
1512 if i
== null then return null
1513 if i
!= v
.null_instance
then return i
1514 return v
.expr
(self.n_expr2
)
1518 redef class AIntExpr
1521 return v
.int_instance
(self.value
.as(not null))
1525 redef class AByteExpr
1528 return v
.byte_instance
(self.value
.as(not null))
1532 redef class AFloatExpr
1535 return v
.float_instance
(self.value
.as(not null))
1539 redef class ACharExpr
1542 return v
.char_instance
(self.value
.as(not null))
1546 redef class AArrayExpr
1549 var val
= new Array[Instance]
1550 var old_comprehension
= v
.frame
.comprehension
1551 v
.frame
.comprehension
= val
1552 for nexpr
in self.n_exprs
do
1553 if nexpr
isa AForExpr then
1556 var i
= v
.expr
(nexpr
)
1557 if i
== null then return null
1561 v
.frame
.comprehension
= old_comprehension
1562 var mtype
= v
.unanchor_type
(self.mtype
.as(not null)).as(MClassType)
1563 var elttype
= mtype
.arguments
.first
1564 return v
.array_instance
(val
, elttype
)
1568 redef class AStringFormExpr
1571 var txt
= self.value
.as(not null)
1572 return v
.string_instance
(txt
)
1576 redef class ASuperstringExpr
1579 var array
= new Array[Instance]
1580 for nexpr
in n_exprs
do
1581 var i
= v
.expr
(nexpr
)
1582 if i
== null then return null
1585 var i
= v
.array_instance
(array
, v
.mainmodule
.object_type
)
1586 var res
= v
.send
(v
.force_get_primitive_method
("plain_to_s", i
.mtype
), [i
])
1592 redef class ACrangeExpr
1595 var e1
= v
.expr
(self.n_expr
)
1596 if e1
== null then return null
1597 var e2
= v
.expr
(self.n_expr2
)
1598 if e2
== null then return null
1599 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1600 var res
= new MutableInstance(mtype
)
1601 v
.init_instance
(res
)
1602 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1607 redef class AOrangeExpr
1610 var e1
= v
.expr
(self.n_expr
)
1611 if e1
== null then return null
1612 var e2
= v
.expr
(self.n_expr2
)
1613 if e2
== null then return null
1614 var mtype
= v
.unanchor_type
(self.mtype
.as(not null))
1615 var res
= new MutableInstance(mtype
)
1616 v
.init_instance
(res
)
1617 v
.callsite
(init_callsite
, [res
, e1
, e2
])
1622 redef class ATrueExpr
1625 return v
.bool_instance
(true)
1629 redef class AFalseExpr
1632 return v
.bool_instance
(false)
1636 redef class ANullExpr
1639 return v
.null_instance
1643 redef class AIsaExpr
1646 var i
= v
.expr
(self.n_expr
)
1647 if i
== null then return null
1648 var mtype
= v
.unanchor_type
(self.cast_type
.as(not null))
1649 return v
.bool_instance
(v
.is_subtype
(i
.mtype
, mtype
))
1653 redef class AAsCastExpr
1656 var i
= v
.expr
(self.n_expr
)
1657 if i
== null then return null
1658 var mtype
= self.mtype
.as(not null)
1659 var amtype
= v
.unanchor_type
(mtype
)
1660 if not v
.is_subtype
(i
.mtype
, amtype
) then
1661 fatal
(v
, "Cast failed. Expected `{amtype}`, got `{i.mtype}`")
1667 redef class AAsNotnullExpr
1670 var i
= v
.expr
(self.n_expr
)
1671 if i
== null then return null
1672 if i
.mtype
isa MNullType then
1673 fatal
(v
, "Cast failed")
1679 redef class AParExpr
1682 return v
.expr
(self.n_expr
)
1686 redef class AOnceExpr
1689 if v
.onces
.has_key
(self) then
1690 return v
.onces
[self]
1692 var res
= v
.expr
(self.n_expr
)
1693 if res
== null then return null
1700 redef class ASendExpr
1703 var recv
= v
.expr
(self.n_expr
)
1704 if recv
== null then return null
1705 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.raw_arguments
)
1706 if args
== null then return null
1708 var res
= v
.callsite
(callsite
, args
)
1713 redef class ASendReassignFormExpr
1716 var recv
= v
.expr
(self.n_expr
)
1717 if recv
== null then return
1718 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.raw_arguments
)
1719 if args
== null then return
1720 var value
= v
.expr
(self.n_value
)
1721 if value
== null then return
1723 var read
= v
.callsite
(callsite
, args
)
1726 var write
= v
.callsite
(reassign_callsite
, [read
, value
])
1727 assert write
!= null
1731 v
.callsite
(write_callsite
, args
)
1735 redef class ASuperExpr
1738 var recv
= v
.frame
.arguments
.first
1740 var callsite
= self.callsite
1741 if callsite
!= null then
1743 if self.n_args
.n_exprs
.is_empty
then
1744 # Add automatic arguments for the super init call
1746 for i
in [0..callsite
.msignature
.arity
[ do
1747 args
.add
(v
.frame
.arguments
[i
+1])
1750 args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.n_args
.n_exprs
)
1751 if args
== null then return null
1755 var res
= v
.callsite
(callsite
, args
)
1759 # Standard call-next-method
1760 var mpropdef
= self.mpropdef
1761 mpropdef
= mpropdef
.lookup_next_definition
(v
.mainmodule
, recv
.mtype
)
1764 if self.n_args
.n_exprs
.is_empty
then
1765 args
= v
.frame
.arguments
1767 args
= v
.varargize
(mpropdef
, signaturemap
, recv
, self.n_args
.n_exprs
)
1768 if args
== null then return null
1771 var res
= v
.call
(mpropdef
, args
)
1776 redef class ANewExpr
1779 var mtype
= v
.unanchor_type
(self.recvtype
.as(not null))
1780 var recv
: Instance = new MutableInstance(mtype
)
1781 v
.init_instance
(recv
)
1782 var callsite
= self.callsite
1783 if callsite
== null then return recv
1785 var args
= v
.varargize
(callsite
.mpropdef
, callsite
.signaturemap
, recv
, self.n_args
.n_exprs
)
1786 if args
== null then return null
1787 var res2
= v
.callsite
(callsite
, args
)
1788 if res2
!= null then
1789 #self.debug("got {res2} from {mproperty}. drop {recv}")
1796 redef class AAttrExpr
1799 var recv
= v
.expr
(self.n_expr
)
1800 if recv
== null then return null
1801 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1802 var mproperty
= self.mproperty
.as(not null)
1803 return v
.read_attribute
(mproperty
, recv
)
1807 redef class AAttrAssignExpr
1810 var recv
= v
.expr
(self.n_expr
)
1811 if recv
== null then return
1812 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1813 var i
= v
.expr
(self.n_value
)
1814 if i
== null then return
1815 var mproperty
= self.mproperty
.as(not null)
1816 v
.write_attribute
(mproperty
, recv
, i
)
1820 redef class AAttrReassignExpr
1823 var recv
= v
.expr
(self.n_expr
)
1824 if recv
== null then return
1825 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1826 var value
= v
.expr
(self.n_value
)
1827 if value
== null then return
1828 var mproperty
= self.mproperty
.as(not null)
1829 var attr
= v
.read_attribute
(mproperty
, recv
)
1830 var res
= v
.callsite
(reassign_callsite
, [attr
, value
])
1832 v
.write_attribute
(mproperty
, recv
, res
)
1836 redef class AIssetAttrExpr
1839 var recv
= v
.expr
(self.n_expr
)
1840 if recv
== null then return null
1841 if recv
.mtype
isa MNullType then fatal
(v
, "Receiver is null")
1842 var mproperty
= self.mproperty
.as(not null)
1843 return v
.bool_instance
(v
.isset_attribute
(mproperty
, recv
))
1847 redef class AVarargExpr
1850 return v
.expr
(self.n_expr
)
1854 redef class ANamedargExpr
1857 return v
.expr
(self.n_expr
)
1861 redef class ADebugTypeExpr