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compile: use writers in icode compilation
[nit.git] / src / compiling / compiling_icode.nit
1 # This file is part of NIT ( http://www.nitlanguage.org ).
2 #
3 # Copyright 2009 Jean Privat <jean@pryen.org>
4 #
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
8 #
9 # http://www.apache.org/licenses/LICENSE-2.0
10 #
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.
16
17 # Generate C code from intermediate code representation
18 package compiling_icode
19
20 import icode
21 private import analysis
22 import compiling_base
23
24 # Compiler context from ICode to C
25 class I2CCompilerVisitor
26 # Associate things
27 var _ids: HashMap[Object, String] = new HashMap[Object, String]
28 # Associate other things
29 var _ids2: HashMap[Object, String] = new HashMap[Object, String]
30
31 # Return the string associated with a register
32 fun register(e: IRegister): String
33 do
34 if e.stype isa MMTypeNone then return "NIT_NULL"
35 var ids = _ids
36 if closure and not e.is_local then ids = _ids2
37 if ids.has_key(e) then
38 return ids[e]
39 else
40 var i = e.slot_index
41 if i == null then
42 # The register is dead
43 var s = "NIT_NULL"
44 ids[e] = s
45 return s
46 else
47 var s: String
48 var strs: HashMap[Int, String]
49 if e.in_tag_slots then
50 strs = once new HashMap[Int, String]
51 if not strs.has_key(i) then strs[i] = "REGB{i}"
52 else if closure and not e.is_local then
53 strs = once new HashMap[Int, String]
54 if not strs.has_key(i) then strs[i] = "closctx->REG[{i}]"
55 else
56 strs = once new HashMap[Int, String]
57 if not strs.has_key(i) then strs[i] = "fra.me.REG[{i}]"
58 end
59 s = strs[i]
60 ids[e] = s
61 return s
62 end
63 end
64 end
65
66 # Return the strings associated with registers
67 fun registers(a: Collection[IRegister]): Array[String]
68 do
69 var r = new Array[String].with_capacity(a.length)
70 for e in a do
71 r.add(register(e))
72 end
73 return r
74 end
75
76 var _last_number: Int = 0
77 # Give a new unique number (unique for the visitor)
78 fun new_number: Int
79 do
80 _last_number += 1
81 return _last_number
82 end
83
84 # Return the string associated with a escape label
85 fun lab(e: ISeq): String
86 do
87 if _ids.has_key(e) then
88 return _ids[e]
89 else
90 var s = "label{new_number}"
91 _ids[e] = s
92 return s
93 end
94 end
95
96 # The rank (number) of each closure
97 readable var _closures: HashMap[IClosureDecl, String] = new HashMap[IClosureDecl, String]
98
99 # The functionnal type of each closure
100 readable var _clostypes: HashMap[IClosureDecl, String] = new HashMap[IClosureDecl, String]
101
102 # label locally accessibles
103 readable writable var _local_labels: HashSet[ISeq] = new HashSet[ISeq]
104
105 # Not local escaped labels
106 # The integer value is an index identifying the label
107 readable writable var _escaped_labels: HashMap[ISeq, Int] = new HashMap[ISeq, Int]
108
109 # Register a escape to a non local label and return an index identifying the label
110 fun register_escape_label(e: ISeq): Int
111 do
112 if _escaped_labels.has_key(e) then
113 return _escaped_labels[e]
114 else
115 var res = _escaped_labels.length + 1
116 _escaped_labels[e] = res
117 return res
118 end
119 end
120
121 # Add a C label mark (if needed)
122 fun add_label(e: ISeq)
123 do
124 if _ids.has_key(e) then
125 add_instr("{_ids[e]}: while(0);")
126 end
127 end
128
129 # Add a goto to a label (even outside a closure)
130 fun add_goto(seq: ISeq)
131 do
132 if local_labels.has(seq) then
133 add_instr("goto {lab(seq)};")
134 else
135 assert closure
136 var ind = register_escape_label(seq)
137 add_instr("closctx->has_broke = {ind};")
138 add_instr("goto {lab(return_label.as(not null))};")
139 end
140 end
141
142 # Association between IEscapeMarks and visited ISeq
143 readable var _marks_to_seq: Map[IEscapeMark, ISeq] = new HashMap[IEscapeMark, ISeq]
144
145 # Are we in a closure ?
146 readable writable var _closure: Bool = false
147
148 # The current compiler visitor
149 readable var _visitor: CompilerVisitor
150
151 # The current compiled iroutine
152 readable var _iroutine: IRoutine
153
154 # The return label of the current compiling C function
155 readable writable var _return_label: nullable ISeq = null
156
157 fun add_decl(s: String)
158 do
159 visitor.add_decl(s)
160 end
161
162 # Prepare a new instuction (indent, comment)
163 # Caller must ensure to add a new line to finish its instr
164 fun new_instr: Writer
165 do
166 var w = visitor.writer
167 var l = _next_location
168 if l != null then
169 visitor.add_indent(w)
170 w.add("/* ")
171 w.add(l.file)
172 w.add(":")
173 w.add(l.line_start.to_s)
174 w.add(" */\n")
175 _next_location = null
176 end
177 visitor.add_indent(w)
178 return w
179 end
180
181 fun add_instr(s: String)
182 do
183 new_instr.add(s).add("\n")
184 end
185
186 fun indent
187 do
188 visitor.indent
189 end
190
191 fun unindent
192 do
193 visitor.unindent
194 end
195
196 fun add_assignment(to, from: String)
197 do
198 visitor.add_assignment(to, from)
199 end
200
201 var _last_location: nullable Location = null
202 var _next_location: nullable Location = null
203
204 # Add location information in a comment
205 # Do nothing if the last location added is the same
206 fun add_location(l: nullable Location)
207 do
208 var last = _last_location
209 if last == l or l == null then return
210 _last_location = l
211 if last != null and last.file == l.file and last.line_start == l.line_start then
212 return
213 else
214 _next_location = l
215 end
216 end
217
218 # The C fonction name of the iroutine
219 readable var _basecname: String
220
221 init(v: CompilerVisitor, ir: IRoutine, cname: String)
222 do
223 _visitor = v
224 _iroutine = ir
225 _basecname = cname
226 end
227 end
228
229 redef class IRoutine
230 # Declare and start a C function that match the routine
231 # Return what must be given to compile_inside_to_c or to compile_to_c
232 # After the method, an openinig { and and indent is added.
233 # So, do not forget to add a sub_context, to unintent and to add a closing }
234 fun compile_signature_to_c(v: CompilerVisitor, cname: String, human_name: nullable String, before_params, after_params: nullable String): Array[String]
235 do
236 var cargs = new Array[String]
237 var cparams = new Array[String]
238 if before_params != null then cparams.add(before_params)
239 for i in [0..params.length[ do
240 cargs.add("p{i}")
241 cparams.add("val_t p{i}")
242 end
243 if closure_decls != null then
244 cparams.add("struct stack_frame_t *closctx_param")
245 for i in [0..closure_decls.length[ do
246 var closcn = "CLOS_{cname}_{i}"
247 var cs = closure_decls[i].closure.signature
248 var subparams = new Array[String] # Parameters of the closure
249 subparams.add("struct stack_frame_t *")
250 for j in [0..cs.arity[ do
251 subparams.add("val_t")
252 end
253 var rr = "void"
254 if cs.return_type != null then rr = "val_t"
255 v.add_decl("typedef {rr} (*{closcn})({subparams.join(", ")});")
256 cargs.add("clos_fun{i}")
257 cparams.add("fun_t clos_fun{i}")
258 end
259 end
260 if after_params != null then cparams.add(after_params)
261 var r = "void"
262 if result != null then r = "val_t"
263 var p: String
264 if cparams.is_empty then
265 p = "void"
266 else
267 p = cparams.join(", ")
268 end
269 if human_name != null then v.add_decl("#define LOCATE_{cname} \"{human_name}\"")
270 v.add_decl("{r} {cname}({p});")
271 v.add_decl("typedef {r} (*{cname}_t)({p});")
272 v.add_instr("{r} {cname}({p})\{")
273 v.indent
274 return cargs
275 end
276
277 # Compile the body of the routine, return the result value is any
278 fun compile_inside_to_c(v: I2CCompilerVisitor, args: Array[String]): nullable String
279 do
280 # Create and push the stack frame
281 var ll = 0
282 if location != null then
283 ll = location.line_start
284 end
285 # Encapsulate the frame ('me') in a larger structure ('fra') that has enough space to store the local variables (REG)
286 if std_slots_nb > 1 then
287 v.add_decl("struct \{struct stack_frame_t me; val_t MORE_REG[{std_slots_nb-1}];\} fra;")
288 else
289 v.add_decl("struct \{struct stack_frame_t me;\} fra;")
290 end
291 v.add_instr("fra.me.prev = stack_frame_head; stack_frame_head = &fra.me;")
292 v.add_instr("fra.me.file = LOCATE_{v.visitor.module.name};")
293 v.add_instr("fra.me.line = {ll};")
294 v.add_instr("fra.me.meth = LOCATE_{v.basecname};")
295 v.add_instr("fra.me.has_broke = 0;")
296 v.add_instr("fra.me.REG_size = {std_slots_nb};")
297
298 # Declare/initialize local variables
299 for i in [0..std_slots_nb[ do
300 v.add_instr("fra.me.REG[{i}] = NIT_NULL;")
301 end
302 for i in [0..tag_slots_nb[ do
303 v.add_decl("val_t REGB{i};")
304 end
305 var iclosdecls = closure_decls
306 if iclosdecls != null then
307 v.add_decl("fun_t CREG[{iclosdecls.length}];")
308 v.add_instr("fra.me.closure_ctx = closctx_param;")
309 v.add_instr("fra.me.closure_funs = CREG;")
310 end
311 var k = 0
312 for r in params do
313 if r.slot_index != null then v.add_assignment(v.register(r), args[k])
314 k += 1
315 end
316 if iclosdecls != null then
317 for i in [0..iclosdecls.length[ do
318 var iclosdecl = iclosdecls[i]
319 v.add_instr("CREG[{i}] = {args[params.length+i]};")
320 v.closures[iclosdecl] = i.to_s
321 var cs = iclosdecl.closure.signature # Closure signature
322 var subparams = new Array[String] # Parameters of the closure
323 subparams.add("struct stack_frame_t *")
324 for j in [0..cs.arity[ do
325 var p = "val_t"
326 subparams.add(p)
327 end
328 var r = "void"
329 if cs.return_type != null then r = "val_t"
330 v.clostypes[iclosdecl] = "{r} (*)({subparams.join(", ")})"
331 end
332 end
333 v.add_decl("val_t tmp;")
334
335 # Prepare return
336 var old_rl = v.return_label
337 v.return_label = body
338
339 # Compile body
340 body.compile_to_c(v)
341
342 v.add_instr("stack_frame_head = fra.me.prev;")
343 v.return_label = old_rl
344 var r = result
345 if r != null then
346 return v.register(r)
347 else
348 return null
349 end
350 end
351
352 # Full compilation of the routine
353 # cv must be in the correct function
354 fun compile_to_c(cv: CompilerVisitor, cname: String, args: Array[String]): nullable String
355 do
356 var v = new I2CCompilerVisitor(cv, self, cname)
357 return compile_inside_to_c(v, args)
358 end
359 end
360
361 redef class ICode
362 # Full compilation of the icode
363 fun compile_to_c(v: I2CCompilerVisitor) is abstract
364
365 # Is a result really needed
366 private fun need_result: Bool
367 do
368 var r = result
369 return r != null and r.slot_index != null
370 end
371
372 # Store s in the result value of self
373 private fun store_result(v: I2CCompilerVisitor, w: nullable Writer)
374 do
375 var r = result
376 if r != null and r.slot_index != null then
377 assert w != null
378 var w2 = v.new_instr
379 w2.add(v.register(r))
380 w2.add(" = ")
381 w2.append(w)
382 w2.add(";\n")
383 else if w != null and not is_pure then
384 # ICode with side effects must be evaluated
385 # even if the result is not wanted
386 var w2 = v.new_instr
387 w2.append(w)
388 w2.add(";\n")
389 end
390 end
391
392 # Prepare a writer if the expression icode need to be compiled
393 # * Result assigment is automatic if needed
394 private fun new_result(v: I2CCompilerVisitor): Writer
395 do
396 assert need_result or not is_pure
397 var w2 = v.new_instr
398 var r = result
399 if r != null and r.slot_index != null then
400 w2.add(v.register(r))
401 w2.add(" = ")
402 end
403 var w = w2.sub
404 w2.add(";\n")
405 return w
406 end
407 end
408
409 redef class ISeq
410 redef fun compile_to_c(v)
411 do
412 v.add_location(location)
413 v.local_labels.add(self)
414 var mark = iescape_mark
415 if mark != null then v.marks_to_seq[mark] = self
416 for ic in icodes do
417 ic.compile_to_c(v)
418 end
419 v.add_label(self)
420 end
421 end
422
423 redef class IIf
424 redef fun compile_to_c(v)
425 do
426 v.add_location(location)
427 var w = v.new_instr
428 w.add("if (UNTAG_Bool(")
429 w.add(v.register(expr))
430 w.add(")) \{\n")
431 if not then_seq.icodes.is_empty then
432 v.indent
433 then_seq.compile_to_c(v)
434 v.unindent
435 end
436 if not else_seq.icodes.is_empty then
437 v.add_instr("\} else \{")
438 v.indent
439 else_seq.compile_to_c(v)
440 v.unindent
441 end
442 v.add_instr("\}")
443 end
444 end
445
446 redef class ILoop
447 redef fun compile_to_c(v)
448 do
449 v.add_location(location)
450 v.local_labels.add(self)
451 var mark = iescape_mark
452 if mark != null then v.marks_to_seq[mark] = self
453 v.add_instr("while(1) \{")
454 v.indent
455 for ic in icodes do
456 ic.compile_to_c(v)
457 end
458 v.unindent
459 v.add_instr("\}")
460 v.add_label(self)
461 end
462 end
463
464 redef class IEscape
465 redef fun compile_to_c(v)
466 do
467 v.add_location(location)
468 v.add_goto(v.marks_to_seq[iescape_mark])
469 end
470 end
471
472 redef class IAbsCall
473 redef fun compile_to_c(v)
474 do
475 v.add_location(location)
476 var args = v.registers(exprs)
477
478 # Compile closure definitions
479 var old_el = v.escaped_labels
480 var closdefs = closure_defs
481 var closctx: nullable String = null # The closure context of closdefs
482 if closdefs != null then
483 # Get the closure context
484 if v.closure then
485 closctx = "closctx"
486 else
487 closctx = "(&(fra.me))"
488 end
489
490 # First aditionnal arguments is the closure context
491 args.add(closctx)
492
493 # We are in a new escape boundary
494 v.escaped_labels = new HashMap[ISeq, Int]
495
496 # Compile each closures and add each sub-function as an other additionnal parameter
497 for cd in closdefs do
498 if cd != null then
499 var cn = cd.compile_closure(v)
500 args.add(cn)
501 else
502 args.add("NULL")
503 end
504 end
505 end
506
507 # Compile the real call
508 var call = compile_call_to_c(v, args)
509 var res: nullable Writer = call
510
511 # Intercept escapes
512 if closctx != null then
513 var els = v.escaped_labels
514 v.escaped_labels = old_el
515 # Is there possible escapes?
516 if not els.is_empty then
517 # Call in a tmp variable to avoid 'break' overwrite
518 var w = v.new_instr
519 if need_result then
520 w.add("tmp")
521 w.add(" = ")
522 w.append(call)
523 w.add(";\n")
524 res = new Writer
525 res.add("tmp")
526 else
527 res = null
528 w.append(call)
529 w.add(";\n")
530 end
531 # What are the expected escape indexes
532 v.new_instr.add("switch (").add(closctx).add("->has_broke) \{\n")
533 v.indent
534 # No escape occured, continue as usual
535 v.add_instr("case 0: break;")
536 var lls = v.local_labels
537 var iels = els.iterator
538 var forward_escape = false
539 while iels.is_ok do
540 var seq = iels.key
541 if lls.has(seq) then
542 # Local escape occured
543 # Clear the has_broke information and go to the target
544 v.new_instr.add("case ").add(iels.item.to_s).add(": ").add(closctx).add("->has_broke = 0; goto ").add(v.lab(seq)).add(";\n")
545 else
546 # Forward escape occured: register the escape label
547 assert v.closure
548 v.register_escape_label(seq)
549 forward_escape = true
550 end
551 iels.next
552 end
553 # If forward escape occured, just pass to the next one
554 if forward_escape then
555 # Do not need to copy 'has_broke' value since it is shared by the next one.
556 # So just exit the C function.
557 v.new_instr.add("default: goto ").add(v.lab(v.return_label.as(not null))).add(";\n")
558 end
559 v.unindent
560 v.add_instr("\}")
561 end
562 end
563
564 if res != null then
565 var w = new_result(v)
566 w.append(res)
567 end
568 end
569
570 # The single invocation witout fancy stuffs
571 private fun compile_call_to_c(v: I2CCompilerVisitor, args: Array[String]): Writer is abstract
572 end
573
574 redef class ICall
575 redef fun compile_call_to_c(v, args)
576 do
577 var w = new Writer
578 var prop = property
579 if prop.global.is_init then args.add("init_table")
580 if prop.name == (once ("add".to_symbol)) and prop.local_class.name == (once ("Array".to_symbol)) then
581 w.add(prop.cname)
582 w.add("(")
583 else
584 w.add(prop.global.meth_call)
585 w.add("(")
586 w.add(args.first)
587 w.add(")(")
588 end
589 var first = true
590 w.add_all(args, ", ")
591 w.add(")")
592 return w
593 end
594 end
595
596 redef class ISuper
597 redef fun compile_call_to_c(v, args)
598 do
599 var prop = property
600 if prop.global.is_init then args.add("init_table")
601 var w = new Writer
602 w.add(prop.super_meth_call)
603 w.add("(")
604 w.add(args.first)
605 w.add(")(")
606 w.add_all(args, ", ")
607 w.add(")")
608 return w
609 end
610 end
611
612 redef class INew
613 redef fun compile_call_to_c(v, args)
614 do
615 var w = new Writer
616 w.add("NEW_")
617 w.add(stype.local_class.to_s)
618 w.add("_")
619 w.add(property.global.intro.cname)
620 w.add("(")
621 w.add_all(args, ", ")
622 w.add(")")
623 return w
624 end
625 end
626
627 redef class IAllocateInstance
628 redef fun compile_to_c(v)
629 do
630 v.add_location(location)
631 var w = new_result(v)
632 w.add("NEW_")
633 w.add(stype.local_class.name.to_s)
634 w.add("()")
635 end
636 end
637
638 redef class ICheckInstance
639 redef fun compile_to_c(v)
640 do
641 v.add_location(location)
642 var w = new_result(v)
643 w.add("CHECKNEW_")
644 w.add(stype.local_class.name.to_s)
645 w.add("(")
646 w.add(v.register(expr))
647 w.add(")")
648 end
649 end
650
651 redef class IInitAttributes
652 redef fun compile_to_c(v)
653 do
654 v.add_location(location)
655 var w = v.new_instr
656 w.add("INIT_ATTRIBUTES__")
657 w.add(stype.local_class.name.to_s)
658 w.add("(")
659 w.add(v.register(expr))
660 w.add(");\n")
661 end
662 end
663
664 redef class IStaticCall
665 redef fun compile_call_to_c(v, args)
666 do
667 var prop = property
668 if prop.global.is_init then args.add("init_table")
669 var w = new Writer
670 w.add(property.cname)
671 w.add("(")
672 w.add_all(args, ", ")
673 w.add(")")
674 return w
675 end
676 end
677
678 redef class INative
679 redef fun compile_to_c(v)
680 do
681 v.add_location(location)
682 var w = new_result(v)
683 if exprs.is_empty then
684 w.add(code)
685 else
686 var i = 0
687 var c = code.split_with("@@@")
688 for s in c do
689 w.add(s)
690 if i < exprs.length and i < c.length-1 then
691 w.add(v.register(exprs[i]))
692 end
693 i += 1
694 end
695 end
696 end
697 end
698
699 redef class IAbort
700 redef fun compile_to_c(v)
701 do
702 v.add_location(location)
703 var w = v.new_instr
704 w.add("fprintf(stderr")
705 for t in texts do
706 w.add(", \"")
707 w.add(t)
708 w.add("\"")
709 end
710 w.add(");\n")
711
712 var ll = location
713 w = v.new_instr
714 w.add("fprintf(stderr, \" (%s")
715 if ll != null then
716 w.add(":%d")
717 end
718 w.add(")\\n\", LOCATE_")
719 w.add(module_location.name.to_s)
720 if ll != null then
721 w.add(", ")
722 w.add(ll.line_start.to_s)
723 end
724 w.add(");\n")
725
726 v.add_instr("nit_exit(1);")
727 end
728 end
729
730 redef class IMove
731 redef fun compile_to_c(v)
732 do
733 if not need_result then return
734 var e = v.register(expr)
735 var r = v.register(result.as(not null))
736 if e == r then return
737 v.add_location(location)
738 var w = v.new_instr
739 w.add(r)
740 w.add(" = ")
741 w.add(e)
742 w.add(";\n")
743 end
744 end
745
746 redef class IAttrRead
747 redef fun compile_to_c(v)
748 do
749 if not need_result then return
750 v.add_location(location)
751 var w = new_result(v)
752 w.add(property.global.attr_access)
753 w.add("(")
754 w.add(v.register(expr))
755 w.add(")")
756 end
757 end
758
759 redef class IAttrIsset
760 redef fun compile_to_c(v)
761 do
762 if not need_result then return
763 v.add_location(location)
764 var w = new_result(v)
765 w.add("TAG_Bool(")
766 w.add(property.global.attr_access)
767 w.add("(")
768 w.add(v.register(expr))
769 w.add(")!=NIT_NULL)")
770 end
771 end
772
773 redef class IAttrWrite
774 redef fun compile_to_c(v)
775 do
776 v.add_location(location)
777 var w = v.new_instr
778 w.add(property.global.attr_access)
779 w.add("(")
780 w.add(v.register(expr1))
781 w.add(") = ")
782 w.add(v.register(expr2))
783 w.add(";\n")
784 end
785 end
786
787 redef class ITypeCheck
788 redef fun compile_to_c(v)
789 do
790 if not need_result then return
791 # FIXME handle formaltypes
792 v.add_location(location)
793 var g = stype.local_class.global
794 var recv = v.register(expr)
795 var w = new_result(v)
796 w.add("TAG_Bool(")
797 if expr.stype.is_nullable then
798 if stype.is_nullable then
799 w.add("(")
800 w.add(recv)
801 w.add("==NIT_NULL) || ")
802 else if stype.as_nullable == expr.stype then
803 w.add(recv)
804 w.add("!=NIT_NULL)")
805 return
806 else
807 w.add("(")
808 w.add(recv)
809 w.add("!=NIT_NULL) && ")
810 end
811 end
812 w.add("VAL_ISA(")
813 w.add(recv)
814 w.add(", ")
815 w.add(g.color_id)
816 w.add(", ")
817 w.add(g.id_id)
818 w.add(")) /*cast ")
819 w.add(stype.to_s)
820 w.add("*/")
821 end
822 end
823
824 redef class IIs
825 redef fun compile_to_c(v)
826 do
827 if not need_result then return
828 v.add_location(location)
829 var w = new_result(v)
830 w.add("TAG_Bool(")
831 var t1 = expr1.stype
832 var t2 = expr2.stype
833 if t1 isa MMTypeNone then
834 if t2 isa MMTypeNone then
835 w.add("1)")
836 return
837 else if t2.is_nullable then
838 w.add(v.register(expr2))
839 w.add("==NIT_NULL)")
840 return
841 else
842 w.add("0)")
843 return
844 end
845 else if t1.is_nullable then
846 if t2 isa MMTypeNone then
847 w.add(v.register(expr1))
848 w.add("==NIT_NULL)")
849 return
850 else if t2.is_nullable then
851 w.add("IS_EQUAL_NN(")
852 else
853 w.add("IS_EQUAL_ON(")
854 w.add(v.register(expr2))
855 w.add(",")
856 w.add(v.register(expr1))
857 w.add("))")
858 return
859 end
860 else
861 if t2 isa MMTypeNone then
862 w.add("0)")
863 return
864 else if t2.is_nullable then
865 w.add("IS_EQUAL_ON(")
866 else
867 w.add("IS_EQUAL_OO(")
868 end
869 end
870 w.add(v.register(expr1))
871 w.add(",")
872 w.add(v.register(expr2))
873 w.add("))")
874 end
875 end
876
877 redef class INot
878 redef fun compile_to_c(v)
879 do
880 if not need_result then return
881 v.add_location(location)
882 var w = new_result(v)
883 w.add("TAG_Bool(!UNTAG_Bool(")
884 w.add(v.register(expr))
885 w.add("))")
886 end
887 end
888
889 redef class IOnce
890 redef fun compile_to_c(v)
891 do
892 v.add_location(location)
893 var i = v.new_number
894 var res = result.as(not null)
895 if res.stype.is_nullable then
896 v.add_decl("static val_t once_value_{i}; static int once_bool_{i}; /* Once value */")
897 v.add_instr("if (!once_bool_{i}) \{")
898 else
899 # Since the value is not nullable, we use the null value to represent the boolean
900 v.add_decl("static val_t once_value_{i}; /* Once value */")
901 v.add_instr("if (!once_value_{i}) \{")
902 end
903 v.indent
904 body.compile_to_c(v)
905 var e = v.register(res)
906 v.add_instr("once_value_{i} = {e};")
907 v.add_instr("register_static_object(&once_value_{i});")
908 if res.stype.is_nullable then v.add_instr("once_bool_{i} = true;")
909 v.unindent
910 v.add_instr("\} else {e} = once_value_{i};")
911 var w = new_result(v)
912 w.add(e)
913 end
914 end
915
916 redef class IClosCall
917 redef fun compile_to_c(v: I2CCompilerVisitor)
918 do
919 v.add_location(location)
920 var ivar: String
921 var args: Array[String]
922 if v.closure then
923 ivar = "closctx->closure_funs[{v.closures[closure_decl]}]"
924 args = ["closctx->closure_ctx"]
925 else
926 ivar = "CREG[{v.closures[closure_decl]}]"
927 args = ["closctx_param"]
928 end
929 args.append(v.registers(exprs))
930
931 var s = "(({v.clostypes[closure_decl]})({ivar}))({args.join(", ")})"
932 var w = new Writer
933 w.add(s)
934 store_result(v, w)
935
936 # Intercept escape
937 v.add_instr("if ({args.first}->has_broke) \{")
938 v.indent
939 var bs = break_seq
940 if bs != null then
941 bs.compile_to_c(v)
942 end
943 v.add_goto(v.iroutine.body)
944 v.unindent
945 v.add_instr("\}")
946 end
947 end
948
949 redef class IHasClos
950 redef fun compile_to_c(v)
951 do
952 if not need_result then return
953 v.add_location(location)
954 var w = new_result(v)
955 w.add("TAG_Bool(")
956 if v.closure then
957 w.add("closctx->closure_funs[")
958 w.add(v.closures[closure_decl])
959 w.add("]")
960 else
961 w.add("CREG[")
962 w.add(v.closures[closure_decl])
963 w.add("]")
964 end
965 w.add(" != NULL)")
966 end
967 end
968
969 redef class IClosureDef
970 # Compile the closure as a separate C function in the visitor out_contexts.
971 # Return a fun_t pointer to the function.
972 fun compile_closure(v: I2CCompilerVisitor): String
973 do
974 var cv = v.visitor
975
976 # We are now in a closure
977 var cfc_old = v.closure
978 v.closure = true
979
980 # We are now in a escape boundary
981 var lls_old = v.local_labels
982 v.local_labels = new HashSet[ISeq]
983
984 # We are now in a new C context
985 var decl_writer_old = cv.decl_writer
986 var writer_old = cv.writer
987 cv.writer = cv.top_writer.sub
988 cv.decl_writer = cv.header_writer.sub
989
990 # Generate the C function
991 var cname = "OC_{v.basecname}_{v.new_number}"
992 var args = compile_signature_to_c(v.visitor, cname, null, "struct stack_frame_t *closctx", null)
993 cv.decl_writer = cv.writer.sub
994
995 var s = compile_inside_to_c(v, args)
996 if s == null then
997 v.add_instr("return;")
998 else
999 v.add_instr("return {s};")
1000 end
1001 v.unindent
1002 v.add_instr("\}")
1003
1004 # Restore things
1005 cv.writer = writer_old
1006 cv.decl_writer = decl_writer_old
1007 v.closure = cfc_old
1008 v.local_labels = lls_old
1009 return "((fun_t){cname})"
1010 end
1011 end
Nit language project; an oo programing language and its tool suite.