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Revision 69650 - (show annotations)
Tue Jul 24 17:18:14 2007 UTC (12 years, 4 months ago) by juliant
File size: 21816 byte(s)
Added monomorph mark for class types, either "frozen" or "invariant".
First (simple) conformance check for monomorphic types.
1 indexing
2 description: "Type class."
3 legal: "See notice at end of class."
4 status: "See notice at end of class."
5 date: "$Date$"
6 revision: "$Revision$"
7
8 class CL_TYPE_I
9
10 inherit
11 TYPE_I
12 redefine
13 anchor_instantiation_in,
14 c_type,
15 conforms_to_array,
16 created_in,
17 external_id,
18 full_type_byte_code_type_id,
19 generate_cid,
20 generate_cid_array,
21 generate_cid_init,
22 generate_gen_type_il,
23 generate_expanded_creation,
24 generate_expanded_initialization,
25 generated_id,
26 internal_generic_derivation,
27 instantiated_description,
28 instantiation_in,
29 is_expanded,
30 is_explicit,
31 is_external,
32 is_frozen,
33 is_generated_as_single_type,
34 is_reference,
35 is_separate,
36 is_consistent,
37 make_gen_type_byte_code,
38 same_as,
39 static_type_id
40 end
41
42 SHARED_IL_CASING
43 export
44 {NONE} all
45 end
46
47 SHARED_GENERATION
48 export
49 {NONE} all
50 end
51
52 SHARED_DECLARATIONS
53 export
54 {NONE} all
55 end
56
57 create
58 make
59
60 feature {NONE} -- Initialization
61
62 make (id: INTEGER) is
63 -- Create new instance of `Current' with `class_id'
64 -- assigned with `id'.
65 require
66 valid_id: id > 0
67 do
68 class_id := id
69 ensure
70 class_id_set: class_id = id
71 end
72
73 feature -- Access
74
75 class_id: INTEGER
76 -- Base class id of the type class
77
78 meta_generic: META_GENERIC is
79 -- Meta generic array describing the type class
80 do
81 -- No meta generic in non-generic type
82 end
83
84 cr_info : CREATE_INFO
85 -- Additional information for the creation
86 -- of generic types with anchored parameters
87
88 true_generics : ARRAY [TYPE_I] is
89 -- Array of generics: no mapping reference -> REFERENCE_I
90 do
91 -- Non generic types don't have them
92 end
93
94 base_class: CLASS_C is
95 -- Base class associated to the class type
96 do
97 Result := System.class_of_id (class_id)
98 end
99
100 internal_generic_derivation (a_level: INTEGER): CL_TYPE_I is
101 -- Precise generic derivation of current type.
102 -- That is to say given a type, it gives the associated TYPE_I
103 -- which can be used to search its associated CLASS_TYPE.
104 local
105 c: like cr_info
106 do
107 c := cr_info
108 if c = Void then
109 Result := Current
110 else
111 -- Remove creation information.
112 cr_info := Void
113 Result := twin
114 cr_info := c
115 end
116 end
117
118 type_a: CL_TYPE_A is
119 do
120 create Result.make (class_id)
121 Result.set_mark (declaration_mark)
122 end
123
124 name: STRING is
125 -- String that should be displayed in debugger to represent `Current'.
126 do
127 Result := base_name
128 end
129
130 duplicate: like Current is
131 -- Duplication
132 do
133 Result := twin
134 end
135
136 reference_type: CL_TYPE_I is
137 -- Corresponding reference type
138 require
139 is_expanded: is_expanded
140 do
141 Result := duplicate
142 Result.set_reference_mark
143 ensure
144 result_is_reference: Result.is_reference
145 end
146
147 instantiation_in (other: CLASS_TYPE): CL_TYPE_I is
148 -- Instantation of Current in `other'
149 do
150 Result := Current
151 end
152
153 anchor_instantiation_in (other: CLASS_TYPE): CL_TYPE_I is
154 -- Instantation of `like Current' parts of Current in `other'
155 do
156 Result := Current
157 end
158
159 created_in (other: CLASS_TYPE): TYPE_I is
160 -- Resulting type of Current as if it was used to create object in `other'.
161 do
162 Result := Current
163 if cr_info /= Void then
164 Result := cr_info.created_in (other)
165 end
166 end
167
168 il_type_name (a_prefix: STRING): STRING is
169 -- Class name of current type.
170 local
171 l_class_c: like base_class
172 l_cl_type: like associated_class_type
173 l_alias_name: STRING
174 l_dot_pos: INTEGER
175 do
176 l_class_c := base_class
177 if is_external then
178 Result := l_class_c.external_class_name.twin
179 else
180 if l_class_c.is_precompiled then
181 -- Reuse the name that was computed at precompilation time.
182 l_cl_type := associated_class_type
183 if l_cl_type.is_precompiled then
184 Result := l_cl_type.il_type_name (a_prefix)
185 end
186 end
187 if Result = Void then
188 if not has_no_mark or else is_basic or else l_class_c.external_class_name.is_equal (l_class_c.name) then
189 Result := internal_il_type_name (l_class_c.name.twin, a_prefix)
190 else
191 -- Special case when an external name has been specified.
192 Result := l_class_c.external_class_name.twin
193 Result.left_adjust
194 Result.right_adjust
195 -- Remove leading `.' since it is not a valid .NET name.
196 from
197 until
198 Result.is_empty or else Result.item (1) /= '.'
199 loop
200 Result.remove_head (1)
201 end
202 -- Remove trailing `.' since it is not a valid .NET name.
203 from
204 until
205 Result.is_empty or else Result.item (Result.count) /= '.'
206 loop
207 Result.remove_tail (1)
208 end
209 if Result.is_empty then
210 -- External name is invalid since empty, we use the normal
211 -- way of generating the .Net name
212 Result := internal_il_type_name (l_class_c.name.twin, a_prefix)
213 else
214 if a_prefix /= Void then
215 l_dot_pos := Result.last_index_of ('.', Result.count)
216 if l_dot_pos = 0 then
217 Result.prepend_character ('.')
218 Result.prepend (a_prefix)
219 else
220 check
221 -- Because there are no more leading or trailing `.'.
222 valid_l_dot_pos: l_dot_pos > 1 and l_dot_pos < Result.count
223 end
224 l_alias_name := Result.substring (l_dot_pos + 1, Result.count)
225 check
226 l_alias_name_not_empty: not l_alias_name.is_empty
227 end
228 Result.keep_head (l_dot_pos)
229 l_alias_name := internal_il_base_type_name (l_alias_name)
230 Result.append (a_prefix)
231 Result.append_character ('.')
232 Result.append (l_alias_name)
233 end
234 end
235 end
236 end
237 end
238 end
239 end
240
241 description, instantiated_description: ATTR_DESC is
242 -- Type description for skeletons
243 local
244 exp: EXPANDED_DESC
245 ref: REFERENCE_DESC
246 do
247 if is_expanded then
248 create exp
249 exp.set_cl_type_i (Current)
250 exp.set_type_i (Current)
251 Result := exp
252 else
253 Result := c_type.description
254 ref ?= Result
255 if ref /= Void then
256 ref.set_type_i (Current)
257 end
258 end
259 end
260
261 c_type: TYPE_C is
262 -- Associated C type
263 do
264 Result := Reference_c_type
265 end
266
267 associated_class_type: CLASS_TYPE is
268 -- Associated class type
269 require
270 has: has_associated_class_type
271 do
272 Result := base_class.types.search_item (Current)
273 ensure
274 result_not_void: Result /= Void
275 end
276
277 type_id: INTEGER is
278 -- Type id of the correponding class type
279 do
280 Result := associated_class_type.type_id
281 end
282
283 static_type_id: INTEGER is
284 -- Type id of the correponding class type
285 require else
286 ok: True
287 do
288 Result := associated_class_type.static_type_id
289 end
290
291 external_id: INTEGER is
292 -- External type id of `Current' (or `static_type_id' for pure Eiffel type).
293 do
294 Result := associated_class_type.external_id
295 end
296
297 sk_value: INTEGER is
298 -- Generate SK value associated to the current type.
299 do
300 if is_expanded then
301 Result := Sk_exp | (type_id - 1)
302 else
303 Result := Sk_ref | (type_id - 1)
304 end
305 end
306
307 hash_code: INTEGER is
308 -- Hash code for current type
309 do
310 Result := Other_code + class_id
311 end
312
313 feature -- Type evaluation
314
315 implemented_type (implemented_in: INTEGER): CL_TYPE_I is
316 -- Parent type that corresponds to the current one.
317 require
318 valid_implemented_in: implemented_in > 0
319 local
320 written_class: CLASS_C
321 do
322 -- If it is defined in current class, that's easy and we
323 -- return `current_type'. Otherwise we have to find the
324 -- correct CLASS_TYPE object where it is implemented.
325 if class_id = implemented_in then
326 Result := Current
327 else
328 written_class := System.class_of_id (implemented_in)
329 -- We go through the hierarchy only when `written_class'
330 -- is generic, otherwise for the most general case where
331 -- `written_class' is not generic it will take a long
332 -- time to go through the inheritance hierarchy.
333 if written_class.types.count > 1 then
334 Result := type_a.find_class_type (written_class).type_i
335 else
336 Result := written_class.types.first.type
337 end
338 end
339 end
340
341 feature -- Status
342
343 element_type: INTEGER_8 is
344 -- Void element type
345 do
346 if is_expanded then
347 Result := {MD_SIGNATURE_CONSTANTS}.Element_type_valuetype
348 else
349 if class_id = System.system_string_class.compiled_class.class_id then
350 Result := {MD_SIGNATURE_CONSTANTS}.Element_type_string
351 elseif class_id = System.system_object_id or class_id = system.any_id then
352 -- For ANY or SYSTEM_OBJECT, we always generate a System.Object
353 -- signature since we can now assign SYSTEM_OBJECTs into ANYs.
354 Result := {MD_SIGNATURE_CONSTANTS}.Element_type_object
355 else
356 Result := {MD_SIGNATURE_CONSTANTS}.Element_type_class
357 end
358 end
359 end
360
361 tuple_code: INTEGER_8 is
362 -- Tuple code for class type
363 do
364 Result := {SHARED_GEN_CONF_LEVEL}.reference_tuple_code
365 end
366
367 has_no_mark: BOOLEAN is
368 -- Has class type no explicit mark?
369 do
370 Result := declaration_mark = {CL_TYPE_A}.no_mark
371 ensure
372 definition: Result = (declaration_mark = {CL_TYPE_A}.no_mark)
373 end
374
375 has_expanded_mark: BOOLEAN is
376 -- Is class type explicitly marked as expanded?
377 do
378 Result := declaration_mark = {CL_TYPE_A}.expanded_mark
379 ensure
380 definition: Result = (declaration_mark = {CL_TYPE_A}.expanded_mark)
381 end
382
383 has_reference_mark: BOOLEAN is
384 -- Is class type explicitly marked as reference?
385 do
386 Result := declaration_mark = {CL_TYPE_A}.reference_mark
387 ensure
388 definition: Result = (declaration_mark = {CL_TYPE_A}.reference_mark)
389 end
390
391 has_separate_mark: BOOLEAN is
392 -- Is class type explicitly marked as reference?
393 do
394 Result := declaration_mark = {CL_TYPE_A}.separate_mark
395 ensure
396 definition: Result = (declaration_mark = {CL_TYPE_A}.separate_mark)
397 end
398
399 has_monomorph_mark: BOOLEAN is
400 -- Is class type explicitly marked as monomorph?
401 do
402 Result := declaration_mark = {CL_TYPE_A}.monomorph_mark
403 ensure
404 definition: Result = (declaration_mark = {CL_TYPE_A}.monomorph_mark)
405 end
406
407 is_expanded: BOOLEAN is
408 -- Is the type expanded?
409 do
410 -- Do not check for `has_separate_mark' because a separate class cannot be expanded.
411 Result := has_expanded_mark or else (has_no_mark and then base_class.is_expanded)
412 end
413
414 is_reference: BOOLEAN is
415 -- Is the type a reference type?
416 do
417 Result := has_reference_mark or else
418 ((has_no_mark or has_separate_mark) and then not base_class.is_expanded)
419 end
420
421 is_separate: BOOLEAN is
422 -- Is the type separate?
423 do
424 Result := has_separate_mark
425 end
426
427 is_enum: BOOLEAN is
428 -- Is current type an IL enum type?
429 -- Useful to find out if some call optimization can be done
430 -- in FEATURE_B.
431 require
432 il_generation: System.il_generation
433 do
434 Result := is_expanded and then base_class.is_enum
435 end
436
437 is_external: BOOLEAN is
438 -- Is current type based on an external class?
439 local
440 l_base_class: like base_class
441 do
442 -- All Eiffel basic types are externals, and only basic types used
443 -- as reference are not external.
444 l_base_class := base_class
445 Result := l_base_class.is_external and then not l_base_class.is_basic
446 end
447
448 is_frozen: BOOLEAN is
449 -- Is current type based on a frozen class?
450 do
451 Result := base_class.is_frozen
452 end
453
454 is_generated_as_single_type: BOOLEAN is
455 -- Is associated type generated as a single type or as an interface type and
456 -- an implementation type.
457 do
458 -- External classes have only one type.
459 Result := is_external
460 if not Result then
461 -- Classes that inherits from external classes
462 -- have only one generated type as well as expanded types.
463 Result := base_class.is_single or else is_expanded
464 end
465 end
466
467 is_consistent: BOOLEAN is
468 -- Is the base class still in the system and matches its specification?
469 local
470 l_base_class: like base_class
471 do
472 l_base_class := base_class
473 Result := l_base_class /= Void and then (l_base_class.generics = Void)
474 end
475
476 is_explicit: BOOLEAN is
477 -- Is Current type fixed at compile time?
478 do
479 if cr_info /= Void then
480 Result := cr_info.is_explicit
481 else
482 Result := True
483 end
484 end
485
486 has_associated_class_type: BOOLEAN is
487 -- Has `Current' an associated class type?
488 do
489 Result := base_class.types.has_type (Current)
490 end
491
492 same_as (other: TYPE_I): BOOLEAN is
493 -- Is `other' equal to Current ?
494 local
495 other_cl_type: CL_TYPE_I
496 do
497 other_cl_type ?= other
498 Result := other_cl_type /= Void -- FIXME
499 and then other_cl_type.class_id = class_id
500 and then other_cl_type.is_expanded = is_expanded
501 and then other_cl_type.is_separate = is_separate
502 and then other_cl_type.meta_generic = Void
503 and then other_cl_type.true_generics = Void
504 end
505
506 has_actual (type: CL_TYPE_I): BOOLEAN is
507 -- Is `type' an (possibly nested) actual parameter of this type?
508 require
509 non_void_type: type /= Void
510 do
511 -- False here.
512 end
513
514 feature -- Setting
515
516 set_expanded_mark is
517 -- Set class type declaration as expanded.
518 do
519 declaration_mark := {CL_TYPE_A}.expanded_mark
520 ensure
521 has_expanded_mark: has_expanded_mark
522 end
523
524 set_reference_mark is
525 -- Set class type declaration as reference.
526 do
527 declaration_mark := {CL_TYPE_A}.reference_mark
528 ensure
529 has_reference_mark: has_reference_mark
530 end
531
532 set_separate_mark is
533 -- Set class type declaration as separate.
534 do
535 declaration_mark := {CL_TYPE_A}.separate_mark
536 ensure
537 has_separate_mark: has_separate_mark
538 end
539
540 set_monomorph_mark is
541 -- Set class type declaration as monomorph.
542 do
543 declaration_mark := {CL_TYPE_A}.monomorph_mark
544 ensure
545 has_monomorph_mark: has_monomorph_mark
546 end
547
548 set_cr_info (cinfo : CREATE_INFO) is
549 -- Set `cr_info' to `cinfo'.
550 require
551 create_info_not_void: cinfo /= Void
552 not_expanded: not is_expanded or else cinfo.is_equal (create {CREATE_CURRENT})
553 do
554 cr_info := cinfo
555 ensure
556 cr_info_set : cr_info = cinfo
557 end
558
559 feature -- C generation
560
561 generate_expanded_creation (buffer: GENERATION_BUFFER; target_name: STRING) is
562 -- Generate creation of expanded object associated to Current.
563 do
564 associated_class_type.generate_expanded_creation (buffer, target_name, Current)
565 end
566
567 generate_expanded_initialization (buffer: GENERATION_BUFFER; target_name: STRING) is
568 -- Generate creation of expanded object associated to Current.
569 do
570 associated_class_type.generate_expanded_initialization (buffer, target_name, target_name, True)
571 end
572
573 generate_cecil_value (buffer: GENERATION_BUFFER) is
574 -- Generate cecil value
575 do
576 if not is_expanded then
577 buffer.put_string ("SK_REF + (uint32) ")
578 else
579 buffer.put_string ("SK_EXP + (uint32) ")
580 end
581 buffer.put_type_id (associated_class_type.type_id)
582 end
583
584 feature -- Array optimization
585
586 conforms_to_array: BOOLEAN is
587 do
588 Result := base_class.conform_to (array_class_c)
589 end
590
591 feature {NONE} -- Array optimization
592
593 array_class_c: CLASS_C is
594 once
595 Result := System.array_class.compiled_class
596 end
597
598 feature {NONE} -- Generic conformance
599
600 full_type_byte_code_type_id: INTEGER is
601 -- Associated type ID used in type information byte code.
602 do
603 Result := type_id - 1
604 ensure then
605 definition: Result = type_id - 1
606 end
607
608 feature -- Generic conformance
609
610 generated_id (final_mode : BOOLEAN) : INTEGER is
611
612 do
613 if final_mode then
614 Result := type_id - 1
615 else
616 Result := associated_class_type.static_type_id - 1
617 end
618 end
619
620 generate_cid (buffer : GENERATION_BUFFER; final_mode, use_info : BOOLEAN) is
621
622 do
623 if
624 use_info and then (cr_info /= Void)
625 and then not is_expanded
626 then
627 -- It's an anchored type
628 cr_info.generate_cid (buffer, final_mode)
629 else
630 buffer.put_integer (generated_id (final_mode))
631 buffer.put_character (',')
632 end
633 end
634
635 make_gen_type_byte_code (ba : BYTE_ARRAY; use_info : BOOLEAN) is
636 do
637 if
638 use_info and then (cr_info /= Void)
639 and then not is_expanded
640 then
641 -- It's an anchored type
642 cr_info.make_gen_type_byte_code (ba)
643 else
644 ba.append_short_integer (generated_id (False))
645 end
646 end
647
648 generate_cid_array (buffer : GENERATION_BUFFER;
649 final_mode, use_info : BOOLEAN; idx_cnt : COUNTER) is
650 local
651 dummy : INTEGER
652 do
653 if
654 use_info and then (cr_info /= Void)
655 and then not is_expanded
656 then
657 -- It's an anchored type
658 cr_info.generate_cid_array (buffer, final_mode, idx_cnt)
659 else
660 buffer.put_integer (generated_id (final_mode))
661 buffer.put_character (',')
662
663 -- Increment counter
664 dummy := idx_cnt.next
665 end
666 end
667
668 generate_cid_init (buffer : GENERATION_BUFFER;
669 final_mode, use_info : BOOLEAN; idx_cnt : COUNTER) is
670 local
671 dummy : INTEGER
672 do
673 if
674 use_info and then (cr_info /= Void)
675 and then not is_expanded
676 then
677 -- It's an anchored type
678 cr_info.generate_cid_init (buffer, final_mode, idx_cnt)
679 else
680 dummy := idx_cnt.next
681 end
682 end
683
684 feature -- Generic conformance for IL
685
686 generate_gen_type_il (il_generator: IL_CODE_GENERATOR; use_info : BOOLEAN) is
687 -- `use_info' is true iff we generate code for a
688 -- creation instruction.
689 do
690 if use_info and then cr_info /= Void then
691 -- It's an anchored type, we call feature
692 -- that will tell us the real type of the
693 -- anchor in the context of Current.
694 cr_info.generate_il_type
695 else
696 il_generator.generate_class_type_instance (Current)
697 end
698 end
699
700 feature {NONE} -- Implementation
701
702 base_name: STRING is
703 -- String that should be displayed in debugger to represent `Current'.
704 local
705 l_base_class: like base_class
706 do
707 create Result.make (32)
708 l_base_class := base_class
709 if is_expanded and not l_base_class.is_expanded then
710 Result.append ("expanded ")
711 elseif is_reference and l_base_class.is_expanded then
712 Result.append ("reference ")
713 elseif is_separate then
714 Result.append ("separate ")
715 end
716 Result.append (l_base_class.name)
717 end
718
719 frozen internal_il_type_name (a_base_name, a_prefix: STRING): STRING is
720 -- Full type name of `a_base_name' using `a_prefix' in IL code generation
721 -- with namespace specification
722 require
723 a_base_name_not_void: a_base_name /= Void
724 a_base_name_not_empty: not a_base_name.is_empty
725 do
726 Result := internal_il_base_type_name (a_base_name)
727 -- Result needs to be in lower case because that's
728 -- what our casing conversion routines require to perform
729 -- a good job.
730 Result.to_lower
731 Result := il_casing.type_name (base_class.original_class.actual_namespace, a_prefix, Result, System.dotnet_naming_convention)
732 ensure
733 internal_il_type_name_not_void: Result /= Void
734 internal_il_type_name_not_empty: not Result.is_empty
735 end
736
737 frozen internal_il_base_type_name (a_base_name: STRING): STRING is
738 -- Given `a_base_name' provides its updated name depending on its usage.
739 require
740 a_base_name_not_void: a_base_name /= Void
741 a_base_name_not_empty: not a_base_name.is_empty
742 local
743 l_base_class: like base_class
744 do
745 l_base_class := base_class
746 if is_expanded and then not l_base_class.is_expanded then
747 create Result.make (6 + a_base_name.count)
748 Result.append ("value_")
749 elseif not is_expanded and then l_base_class.is_expanded then
750 create Result.make (10 + a_base_name.count)
751 Result.append ("reference_")
752 else
753 create Result.make (a_base_name.count)
754 end
755 Result.append (a_base_name)
756 ensure
757 internal_il_base_type_name_not_void: Result /= Void
758 internal_il_base_type_name_not_empty: not Result.is_empty
759 end
760
761 feature {CL_TYPE_A, TUPLE_CLASS_B, CIL_CODE_GENERATOR} -- Implementation: class type declaration marks
762
763 declaration_mark: NATURAL_8
764 -- Declaration mark associated with a class type (if any)
765
766 feature {CL_TYPE_A, TUPLE_CLASS_B} -- Implementation: class type declaration marks
767
768 set_mark (mark: like declaration_mark) is
769 -- Set `declaration_mark' to the given value `mark'.
770 require
771 valid_declaration_mark:
772 mark = {CL_TYPE_A}.no_mark or mark = {CL_TYPE_A}.expanded_mark or
773 mark = {CL_TYPE_A}.reference_mark or mark = {CL_TYPE_A}.separate_mark or
774 mark = {CL_TYPE_A}.monomorph_mark
775 do
776 declaration_mark := mark
777 ensure
778 declaration_mark_set: declaration_mark = mark
779 end
780
781 invariant
782 class_id_positive: class_id > 0
783 valid_declaration_mark:
784 declaration_mark = {CL_TYPE_A}.no_mark or
785 declaration_mark = {CL_TYPE_A}.expanded_mark or
786 declaration_mark = {CL_TYPE_A}.reference_mark or
787 declaration_mark = {CL_TYPE_A}.separate_mark or
788 declaration_mark = {CL_TYPE_A}.monomorph_mark
789
790 indexing
791 copyright: "Copyright (c) 1984-2006, Eiffel Software"
792 license: "GPL version 2 (see http://www.eiffel.com/licensing/gpl.txt)"
793 licensing_options: "http://www.eiffel.com/licensing"
794 copying: "[
795 This file is part of Eiffel Software's Eiffel Development Environment.
796
797 Eiffel Software's Eiffel Development Environment is free
798 software; you can redistribute it and/or modify it under
799 the terms of the GNU General Public License as published
800 by the Free Software Foundation, version 2 of the License
801 (available at the URL listed under "license" above).
802
803 Eiffel Software's Eiffel Development Environment is
804 distributed in the hope that it will be useful, but
805 WITHOUT ANY WARRANTY; without even the implied warranty
806 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
807 See the GNU General Public License for more details.
808
809 You should have received a copy of the GNU General Public
810 License along with Eiffel Software's Eiffel Development
811 Environment; if not, write to the Free Software Foundation,
812 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
813 ]"
814 source: "[
815 Eiffel Software
816 356 Storke Road, Goleta, CA 93117 USA
817 Telephone 805-685-1006, Fax 805-685-6869
818 Website http://www.eiffel.com
819 Customer support http://support.eiffel.com
820 ]"
821
822 end

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