0
# Advanced Features
1

2
Advanced Truffle capabilities for sophisticated language implementations, including library-based dispatch systems, static object layouts, runtime utilities, and performance optimization infrastructure.
3

4
## Capabilities
5

6
### Library Dispatch System
7

8
Framework for creating custom library-based dispatch systems with automatic caching and specialization.
9

10
```java { .api }
11
/**
12
 * Base class for creating custom libraries
13
 */
14
public abstract class Library extends Node {
15
    
16
    /**
17
     * Check if library accepts receiver type
18
     * @param receiver Object to check
19
     * @return true if accepts
20
     */
21
    public boolean accepts(Object receiver) {
22
        return true;
23
    }
24
    
25
    /**
26
     * Get library priority for receiver
27
     * @param receiver Object to check
28
     * @return Priority value (higher = preferred)
29
     */
30
    public int getPriority() {
31
        return 0;
32
    }
33
}
34

35
/**
36
 * Factory for creating library instances
37
 * @param <T> Library type
38
 */
39
public abstract class LibraryFactory<T extends Library> {
40
    
41
    /**
42
     * Get factory for library class
43
     * @param libraryClass Library class
44
     * @return LibraryFactory instance
45
     */
46
    public static <T extends Library> LibraryFactory<T> resolve(Class<T> libraryClass) {
47
        return null; // Implementation details
48
    }
49
    
50
    /**
51
     * Get uncached library instance
52
     * @return Uncached library
53
     */
54
    public abstract T getUncached();
55
    
56
    /**
57
     * Get uncached library for specific receiver
58
     * @param receiver Target receiver
59
     * @return Uncached library
60
     */
61
    public abstract T getUncached(Object receiver);
62
    
63
    /**
64
     * Create cached library
65
     * @param receiver Target receiver
66
     * @return Cached library
67
     */
68
    public abstract T create(Object receiver);
69
    
70
    /**
71
     * Create dispatched library
72
     * @param limit Cache limit
73
     * @return Dispatched library
74
     */
75
    public abstract T createDispatched(int limit);
76
    
77
    /**
78
     * Get dispatch class
79
     * @return Library dispatch class
80
     */
81
    public abstract Class<?> getDispatchClass();
82
}
83

84
/**
85
 * Annotation for generating library classes
86
 */
87
@Retention(RetentionPolicy.CLASS)
88
@Target(ElementType.TYPE)
89
public @interface GenerateLibrary {
90
    
91
    /**
92
     * Default export receiver type
93
     * @return Receiver class
94
     */
95
    Class<?> defaultExportLookupEnabled() default Object.class;
96
    
97
    /**
98
     * Whether to generate assert messages
99
     * @return true to generate
100
     */
101
    boolean assertions() default true;
102
    
103
    /**
104
     * Push encapsulating node to library calls
105
     * @return true to push
106
     */
107
    boolean pushEncapsulatingNode() default true;
108
}
109

110
/**
111
 * Message representation for library operations
112
 */
113
public abstract class Message {
114
    
115
    /**
116
     * Get message name
117
     * @return Simple message name
118
     */
119
    public abstract String getSimpleName();
120
    
121
    /**
122
     * Get qualified message name
123
     * @return Qualified message name
124
     */
125
    public abstract String getQualifiedName();
126
    
127
    /**
128
     * Get library class
129
     * @return Library class containing message
130
     */
131
    public abstract Class<? extends Library> getLibraryClass();
132
}
133

134
/**
135
 * Default export provider interface
136
 */
137
public interface DefaultExportProvider {
138
    
139
    /**
140
     * Get default export class
141
     * @return Export class
142
     */
143
    Class<?> getExportClass();
144
    
145
    /**
146
     * Get export priority
147
     * @return Priority value
148
     */
149
    int getPriority();
150
    
151
    /**
152
     * Create export instance
153
     * @return Export instance
154
     */
155
    Object createExport();
156
}
157

158
/**
159
 * Eager export provider for immediate initialization
160
 */
161
public interface EagerExportProvider extends DefaultExportProvider {
162
    
163
    /**
164
     * Get eager export list
165
     * @return List of export classes
166
     */
167
    List<Class<?>> getEagerExports();
168
}
169

170
/**
171
 * Library that provides reflection capabilities
172
 */
173
public abstract class ReflectionLibrary extends Library {
174
    
175
    /**
176
     * Get uncached reflection library
177
     * @return Uncached library
178
     */
179
    public static ReflectionLibrary getUncached() {
180
        return null; // Implementation details
181
    }
182
    
183
    /**
184
     * Send message to object
185
     * @param receiver Target object
186
     * @param message Message to send
187
     * @param arguments Message arguments
188
     * @return Message result
189
     * @throws Exception if message fails
190
     */
191
    public abstract Object send(Object receiver, Message message, Object... arguments) throws Exception;
192
    
193
    /**
194
     * Check if object has message
195
     * @param receiver Target object
196
     * @param message Message to check
197
     * @return true if has message
198
     */
199
    public abstract boolean accepts(Object receiver, Message message);
200
}
201

202
/**
203
 * Library for dynamic dispatch based on receiver type
204
 */
205
public abstract class DynamicDispatchLibrary extends Library {
206
    
207
    /**
208
     * Get uncached dynamic dispatch library
209
     * @return Uncached library
210
     */
211
    public static DynamicDispatchLibrary getUncached() {
212
        return null; // Implementation details
213
    }
214
    
215
    /**
216
     * Dispatch call based on receiver type
217
     * @param receiver Call receiver
218
     * @param name Method name
219
     * @param arguments Call arguments
220
     * @return Call result
221
     * @throws Exception if dispatch fails
222
     */
223
    public abstract Object dispatch(Object receiver, String name, Object... arguments) throws Exception;
224
    
225
    /**
226
     * Get dispatch target class
227
     * @param receiver Dispatch receiver
228
     * @return Target class for dispatch
229
     */
230
    public Class<?> dispatch(Object receiver) {
231
        return receiver.getClass();
232
    }
233
}
234
```
235

236
**Usage Example:**
237

238
```java
239
@GenerateLibrary
240
public abstract class MathLibrary extends Library {
241
    
242
    /**
243
     * Add two numbers
244
     * @param receiver Left operand
245
     * @param other Right operand
246
     * @return Addition result
247
     */
248
    public Object add(Object receiver, Object other) {
249
        // Default implementation
250
        throw new UnsupportedOperationException("add not supported");
251
    }
252
    
253
    /**
254
     * Multiply two numbers
255
     * @param receiver Left operand
256
     * @param other Right operand
257
     * @return Multiplication result
258
     */
259
    public Object multiply(Object receiver, Object other) {
260
        // Default implementation  
261
        throw new UnsupportedOperationException("multiply not supported");
262
    }
263
}
264

265
@ExportLibrary(MathLibrary.class)
266
public class MyNumber implements TruffleObject {
267
    private final double value;
268
    
269
    public MyNumber(double value) {
270
        this.value = value;
271
    }
272
    
273
    @ExportMessage
274
    Object add(Object other) {
275
        if (other instanceof MyNumber) {
276
            return new MyNumber(this.value + ((MyNumber) other).value);
277
        }
278
        throw new UnsupportedOperationException();
279
    }
280
    
281
    @ExportMessage
282
    Object multiply(Object other) {
283
        if (other instanceof MyNumber) {
284
            return new MyNumber(this.value * ((MyNumber) other).value);
285
        }
286
        throw new UnsupportedOperationException();
287
    }
288
}
289
```
290

291
### Static Object System
292

293
High-performance object layouts with compile-time shape optimization.
294

295
```java { .api }
296
/**
297
 * Static object shape defining compile-time layout
298
 * @param <T> Object type
299
 */
300
public abstract class StaticShape<T> {
301
    
302
    /**
303
     * Get property by name
304
     * @param propertyName Property name
305
     * @return StaticProperty instance or null
306
     */
307
    public abstract StaticProperty getProperty(Object propertyName);
308
    
309
    /**
310
     * Create new instance with this shape
311
     * @return New object instance
312
     */
313
    public abstract T newInstance();
314
    
315
    /**
316
     * Get language associated with shape
317
     * @return TruffleLanguage instance
318
     */
319
    public abstract TruffleLanguage<?> getLanguage();
320
    
321
    /**
322
     * Create shape builder
323
     * @param language Target language
324
     * @return Builder instance
325
     */
326
    public static <T> Builder<T> newBuilder(TruffleLanguage<?> language) {
327
        return null; // Implementation details
328
    }
329
    
330
    /**
331
     * Builder for creating static shapes
332
     * @param <T> Object type
333
     */
334
    public static final class Builder<T> {
335
        
336
        /**
337
         * Add property to shape
338
         * @param property Property to add
339
         * @param type Property type
340
         * @param isFinal Whether property is final
341
         * @return Builder instance
342
         */
343
        public Builder<T> property(StaticProperty property, Class<?> type, boolean isFinal) {
344
            return this;
345
        }
346
        
347
        /**
348
         * Add property with name and type
349
         * @param name Property name
350
         * @param type Property type
351
         * @return Builder instance
352
         */
353
        public Builder<T> property(String name, Class<?> type) {
354
            return property(StaticProperty.create(name), type, false);
355
        }
356
        
357
        /**
358
         * Add final property
359
         * @param name Property name
360
         * @param type Property type
361
         * @return Builder instance
362
         */
363
        public Builder<T> finalProperty(String name, Class<?> type) {
364
            return property(StaticProperty.create(name), type, true);
365
        }
366
        
367
        /**
368
         * Build static shape
369
         * @return StaticShape instance
370
         */
371
        public StaticShape<T> build() {
372
            return null; // Implementation details
373
        }
374
        
375
        /**
376
         * Build with factory
377
         * @param factory Object factory
378
         * @return StaticShape instance
379
         */
380
        public StaticShape<T> build(Class<T> factory) {
381
            return null; // Implementation details
382
        }
383
    }
384
}
385

386
/**
387
 * Property descriptor for static objects
388
 */
389
public interface StaticProperty {
390
    
391
    /**
392
     * Create property with name
393
     * @param name Property name
394
     * @return StaticProperty instance
395
     */
396
    static StaticProperty create(String name) {
397
        return null; // Implementation details
398
    }
399
    
400
    /**
401
     * Get property name
402
     * @return Property name
403
     */
404
    String getName();
405
    
406
    /**
407
     * Get property ID for access
408
     * @return Property identifier
409
     */
410
    String getId();
411
}
412

413
/**
414
 * Shape generator for array-based storage
415
 */
416
public abstract class ArrayBasedShapeGenerator<T> extends ShapeGenerator<T> {
417
    
418
    /**
419
     * Create array-based generator
420
     * @param language Target language
421
     * @return Generator instance
422
     */
423
    public static <T> ArrayBasedShapeGenerator<T> create(TruffleLanguage<?> language) {
424
        return null; // Implementation details
425
    }
426
}
427

428
/**
429
 * Shape generator for field-based storage
430
 */
431
public abstract class FieldBasedShapeGenerator<T> extends ShapeGenerator<T> {
432
    
433
    /**
434
     * Create field-based generator
435
     * @param language Target language
436
     * @return Generator instance
437
     */
438
    public static <T> FieldBasedShapeGenerator<T> create(TruffleLanguage<?> language) {
439
        return null; // Implementation details
440
    }
441
}
442

443
/**
444
 * Base shape generator class
445
 * @param <T> Object type
446
 */
447
public abstract class ShapeGenerator<T> {
448
    
449
    /**
450
     * Generate static shape
451
     * @param properties Property definitions
452
     * @return StaticShape instance
453
     */
454
    public abstract StaticShape<T> generateShape(StaticProperty... properties);
455
    
456
    /**
457
     * Generate shape with factory
458
     * @param factory Object factory class
459
     * @param properties Property definitions
460
     * @return StaticShape instance
461
     */
462
    public abstract StaticShape<T> generateShape(Class<T> factory, StaticProperty... properties);
463
}
464
```
465

466
### Runtime Utilities
467

468
Essential runtime utilities for assumptions, context management, and optimization support.
469

470
```java { .api }
471
/**
472
 * Assumed value with invalidation support
473
 * @param <T> Value type
474
 */
475
public final class AssumedValue<T> {
476
    
477
    /**
478
     * Create assumed value
479
     * @param name Assumption name
480
     * @param initialValue Initial value
481
     */
482
    public AssumedValue(String name, T initialValue) {
483
        // Implementation details
484
    }
485
    
486
    /**
487
     * Create assumed value with name
488
     * @param name Assumption name
489
     * @return AssumedValue instance
490
     */
491
    public static <T> AssumedValue<T> create(String name) {
492
        return new AssumedValue<>(name, null);
493
    }
494
    
495
    /**
496
     * Get current value (optimized)
497
     * @return Current value
498
     */
499
    public T get() {
500
        return null; // Implementation details
501
    }
502
    
503
    /**
504
     * Get current value with assumption check
505
     * @param assumption Assumption to validate
506
     * @return Current value
507
     */
508
    public T get(Assumption assumption) {
509
        return null; // Implementation details
510
    }
511
    
512
    /**
513
     * Set new value (invalidates assumption)
514
     * @param newValue New value
515
     */
516
    public void set(T newValue) {
517
        // Implementation details
518
    }
519
    
520
    /**
521
     * Get underlying assumption
522
     * @return Assumption instance
523
     */
524
    public Assumption getAssumption() {
525
        return null; // Implementation details
526
    }
527
}
528

529
/**
530
 * Cyclic assumption management
531
 */
532
public final class CyclicAssumption {
533
    
534
    /**
535
     * Create cyclic assumption
536
     * @param name Assumption name
537
     */
538
    public CyclicAssumption(String name) {
539
        // Implementation details
540
    }
541
    
542
    /**
543
     * Get current assumption
544
     * @return Current Assumption
545
     */
546
    public Assumption getAssumption() {
547
        return null; // Implementation details
548
    }
549
    
550
    /**
551
     * Invalidate current assumption and create new one
552
     */
553
    public void invalidate() {
554
        // Implementation details
555
    }
556
    
557
    /**
558
     * Invalidate with message
559
     * @param message Invalidation message
560
     */
561
    public void invalidate(String message) {
562
        // Implementation details
563
    }
564
}
565

566
/**
567
 * Context-local storage
568
 * @param <T> Stored value type
569
 */
570
public final class ContextLocal<T> {
571
    
572
    /**
573
     * Get value for current context
574
     * @return Context-local value
575
     */
576
    public T get() {
577
        return null; // Implementation details
578
    }
579
    
580
    /**
581
     * Get value for specific context
582
     * @param context Target context
583
     * @return Context-local value
584
     */
585
    public T get(TruffleContext context) {
586
        return null; // Implementation details
587
    }
588
    
589
    /**
590
     * Set value for current context
591
     * @param value New value
592
     */
593
    public void set(T value) {
594
        // Implementation details
595
    }
596
    
597
    /**
598
     * Set value for specific context
599
     * @param context Target context
600
     * @param value New value
601
     */
602
    public void set(TruffleContext context, T value) {
603
        // Implementation details
604
    }
605
}
606

607
/**
608
 * Context-thread-local storage
609
 * @param <T> Stored value type
610
 */
611
public final class ContextThreadLocal<T> {
612
    
613
    /**
614
     * Get value for current context and thread
615
     * @return Context-thread-local value
616
     */
617
    public T get() {
618
        return null; // Implementation details
619
    }
620
    
621
    /**
622
     * Get value for specific context and current thread
623
     * @param context Target context
624
     * @return Context-thread-local value
625
     */
626
    public T get(TruffleContext context) {
627
        return null; // Implementation details
628
    }
629
    
630
    /**
631
     * Get value for specific context and thread
632
     * @param context Target context
633
     * @param thread Target thread
634
     * @return Context-thread-local value
635
     */
636
    public T get(TruffleContext context, Thread thread) {
637
        return null; // Implementation details
638
    }
639
    
640
    /**
641
     * Set value for current context and thread
642
     * @param value New value
643
     */
644
    public void set(T value) {
645
        // Implementation details
646
    }
647
    
648
    /**
649
     * Set value for specific context and current thread
650
     * @param context Target context
651
     * @param value New value
652
     */
653
    public void set(TruffleContext context, T value) {
654
        // Implementation details
655
    }
656
}
657

658
/**
659
 * Action executed on specific threads
660
 */
661
public abstract class ThreadLocalAction {
662
    
663
    /**
664
     * Perform action on thread
665
     * @param access Thread access interface
666
     */
667
    protected abstract void perform(Access access);
668
    
669
    /**
670
     * Thread access interface for actions
671
     */
672
    public interface Access {
673
        
674
        /**
675
         * Get current thread
676
         * @return Thread instance
677
         */
678
        Thread getThread();
679
        
680
        /**
681
         * Check if thread is current
682
         * @return true if current thread
683
         */
684
        boolean isCurrentThread();
685
        
686
        /**
687
         * Submit action to thread
688
         * @param action Action to submit
689
         */
690
        void submit(ThreadLocalAction action);
691
    }
692
}
693

694
/**
695
 * Truffle file system abstraction
696
 */
697
public final class TruffleFile {
698
    
699
    /**
700
     * Check if file exists
701
     * @return true if exists
702
     */
703
    public boolean exists() {
704
        return false; // Implementation details
705
    }
706
    
707
    /**
708
     * Check if is directory
709
     * @return true if directory
710
     */
711
    public boolean isDirectory() {
712
        return false; // Implementation details
713
    }
714
    
715
    /**
716
     * Check if is regular file
717
     * @return true if regular file
718
     */
719
    public boolean isRegularFile() {
720
        return false; // Implementation details
721
    }
722
    
723
    /**
724
     * Get file size
725
     * @return File size in bytes
726
     */
727
    public long size() throws IOException {
728
        return 0; // Implementation details
729
    }
730
    
731
    /**
732
     * Get file name
733
     * @return File name
734
     */
735
    public String getName() {
736
        return null; // Implementation details
737
    }
738
    
739
    /**
740
     * Get file path
741
     * @return File path string
742
     */
743
    public String getPath() {
744
        return null; // Implementation details
745
    }
746
    
747
    /**
748
     * Read all bytes
749
     * @return File content as bytes
750
     */
751
    public byte[] readAllBytes() throws IOException {
752
        return null; // Implementation details
753
    }
754
    
755
    /**
756
     * Read all text
757
     * @param charset Character set
758
     * @return File content as string
759
     */
760
    public String readString(Charset charset) throws IOException {
761
        return null; // Implementation details
762
    }
763
    
764
    /**
765
     * Write bytes to file
766
     * @param bytes Bytes to write
767
     */
768
    public void write(byte[] bytes) throws IOException {
769
        // Implementation details
770
    }
771
    
772
    /**
773
     * Write string to file
774
     * @param content String content
775
     * @param charset Character set
776
     */
777
    public void writeString(String content, Charset charset) throws IOException {
778
        // Implementation details
779
    }
780
    
781
    /**
782
     * Create input stream
783
     * @return InputStream for file
784
     */
785
    public InputStream newInputStream() throws IOException {
786
        return null; // Implementation details
787
    }
788
    
789
    /**
790
     * Create output stream
791
     * @return OutputStream for file
792
     */
793
    public OutputStream newOutputStream() throws IOException {
794
        return null; // Implementation details
795
    }
796
    
797
    /**
798
     * List directory contents
799
     * @return Array of TruffleFile instances
800
     */
801
    public TruffleFile[] list() throws IOException {
802
        return null; // Implementation details
803
    }
804
    
805
    /**
806
     * Resolve child path
807
     * @param child Child path
808
     * @return Child TruffleFile
809
     */
810
    public TruffleFile resolve(String child) {
811
        return null; // Implementation details
812
    }
813
    
814
    /**
815
     * Get parent directory
816
     * @return Parent TruffleFile or null
817
     */
818
    public TruffleFile getParent() {
819
        return null; // Implementation details
820
    }
821
}
822

823
/**
824
 * Truffe logger with language-specific configuration
825
 */
826
public final class TruffleLogger {
827
    
828
    /**
829
     * Log info message
830
     * @param message Log message
831
     */
832
    public void info(String message) {
833
        // Implementation details
834
    }
835
    
836
    /**
837
     * Log warning message
838
     * @param message Log message
839
     */
840
    public void warning(String message) {
841
        // Implementation details
842
    }
843
    
844
    /**
845
     * Log error message
846
     * @param message Log message
847
     */
848
    public void severe(String message) {
849
        // Implementation details
850
    }
851
    
852
    /**
853
     * Log debug message
854
     * @param message Log message
855
     */
856
    public void fine(String message) {
857
        // Implementation details
858
    }
859
    
860
    /**
861
     * Check if level is loggable
862
     * @param level Log level
863
     * @return true if loggable
864
     */
865
    public boolean isLoggable(Level level) {
866
        return false; // Implementation details
867
    }
868
    
869
    /**
870
     * Log with level
871
     * @param level Log level
872
     * @param message Log message
873
     */
874
    public void log(Level level, String message) {
875
        // Implementation details
876
    }
877
    
878
    /**
879
     * Log with level and throwable
880
     * @param level Log level
881
     * @param message Log message
882
     * @param thrown Exception to log
883
     */
884
    public void log(Level level, String message, Throwable thrown) {
885
        // Implementation details
886
    }
887
}
888

889
/**
890
 * Safepoint management for thread coordination
891
 */
892
public final class TruffleSafepoint {
893
    
894
    /**
895
     * Poll safepoint on current thread
896
     */
897
    public static void poll() {
898
        // Implementation details
899
    }
900
    
901
    /**
902
     * Poll safepoint with node context
903
     * @param location Node location for debugging
904
     */
905
    public static void poll(Node location) {
906
        // Implementation details
907
    }
908
    
909
    /**
910
     * Set pending safepoint
911
     * @param action Action to execute at safepoint
912
     */
913
    public static void setPending(ThreadLocalAction action) {
914
        // Implementation details
915
    }
916
    
917
    /**
918
     * Check if safepoint is pending
919
     * @return true if pending
920
     */
921
    public static boolean isPending() {
922
        return false; // Implementation details
923
    }
924
}
925
```
926

927
### Compiler Integration
928

929
Advanced compiler directives and optimization support.
930

931
```java { .api }
932
/**
933
 * Compiler directives for optimization hints
934
 */
935
public final class CompilerDirectives {
936
    
937
    /**
938
     * Mark code path as unlikely
939
     * @param condition Condition to check
940
     * @return Original condition value
941
     */
942
    public static boolean injectBranchProbability(double probability, boolean condition) {
943
        return condition;
944
    }
945
    
946
    /**
947
     * Indicate slow path execution
948
     */
949
    public static void transferToInterpreter() {
950
        // Implementation details
951
    }
952
    
953
    /**
954
     * Indicate slow path with message
955
     * @param message Transfer reason
956
     */
957
    public static void transferToInterpreterAndInvalidate() {
958
        // Implementation details
959
    }
960
    
961
    /**
962
     * Check if compiled
963
     * @return true if compiled code
964
     */
965
    public static boolean inCompiledCode() {
966
        return false; // Implementation details
967
    }
968
    
969
    /**
970
     * Check if interpreting
971
     * @return true if interpreter
972
     */
973
    public static boolean inInterpreter() {
974
        return !inCompiledCode();
975
    }
976
    
977
    /**
978
     * Blackhole value to prevent optimization
979
     * @param value Value to blackhole
980
     */
981
    public static void blackhole(Object value) {
982
        // Implementation details
983
    }
984
    
985
    /**
986
     * Mark value as compilation final
987
     * @param value Value to mark
988
     * @return Original value
989
     */
990
    public static <T> T compilationFinal(T value) {
991
        return value;
992
    }
993
    
994
    /**
995
     * Ensure virtualized
996
     * @param object Object to virtualize
997
     * @return Original object
998
     */
999
    public static <T> T ensureVirtualized(T object) {
1000
        return object;
1001
    }
1002
    
1003
    /**
1004
     * Cast exact type
1005
     * @param value Value to cast
1006
     * @param type Target type
1007
     * @return Cast value
1008
     */
1009
    @SuppressWarnings("unchecked")
1010
    public static <T> T castExact(Object value, Class<T> type) {
1011
        return (T) value;
1012
    }
1013
    
1014
    /**
1015
     * Mark boundary between compiled and interpreter
1016
     */
1017
    public static void interpreterOnly(Runnable runnable) {
1018
        runnable.run();
1019
    }
1020
}
1021

1022
/**
1023
 * Compilation-time assertions
1024
 */
1025
public final class CompilerAsserts {
1026
    
1027
    /**
1028
     * Assert never reached in compiled code
1029
     */
1030
    public static void neverPartOfCompilation() {
1031
        // Implementation details
1032
    }
1033
    
1034
    /**
1035
     * Assert never reached with message
1036
     * @param message Assertion message
1037
     */
1038
    public static void neverPartOfCompilation(String message) {
1039
        // Implementation details
1040
    }
1041
    
1042
    /**
1043
     * Assert always compiled
1044
     */
1045
    public static void partialEvaluationConstant(Object value) {
1046
        // Implementation details
1047
    }
1048
    
1049
    /**
1050
     * Assert compilation final
1051
     * @param value Value to check
1052
     */
1053
    public static void compilationConstant(Object value) {
1054
        // Implementation details
1055
    }
1056
}
1057
```
1058

1059
## Types
1060

1061
### Advanced Configuration Types
1062

1063
```java { .api }
1064
/**
1065
 * Option descriptor for language/instrument options
1066
 */
1067
public final class OptionDescriptor {
1068
    
1069
    /**
1070
     * Create option descriptor
1071
     * @param key Option key
1072
     * @param help Help text
1073
     * @return OptionDescriptor instance
1074
     */
1075
    public static OptionDescriptor newBuilder(OptionKey<?> key, String help) {
1076
        return null; // Implementation details
1077
    }
1078
    
1079
    /**
1080
     * Get option key
1081
     * @return OptionKey instance
1082
     */
1083
    public OptionKey<?> getKey() {
1084
        return null; // Implementation details
1085
    }
1086
    
1087
    /**
1088
     * Get help text
1089
     * @return Help text
1090
     */
1091
    public String getHelp() {
1092
        return null; // Implementation details
1093
    }
1094
    
1095
    /**
1096
     * Get option name
1097
     * @return Option name
1098
     */
1099
    public String getName() {
1100
        return null; // Implementation details
1101
    }
1102
}
1103

1104
/**
1105
 * Descriptor for option categories
1106
 */
1107
public enum OptionCategory {
1108
    USER, EXPERT, DEBUG
1109
}
1110

1111
/**
1112
 * Stability level for APIs
1113
 */
1114
public enum OptionStability {
1115
    STABLE, EXPERIMENTAL
1116
}
1117

1118
/**
1119
 * Memory management utilities
1120
 */
1121
public final class MemoryUtil {
1122
    
1123
    /**
1124
     * Get object size estimate
1125
     * @param object Object to measure
1126
     * @return Size estimate in bytes
1127
     */
1128
    public static long sizeOf(Object object) {
1129
        return 0; // Implementation details
1130
    }
1131
    
1132
    /**
1133
     * Trigger garbage collection hint
1134
     */
1135
    public static void gc() {
1136
        System.gc();
1137
    }
1138
}
1139
```