1 /*
2 * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.jvm;
27
28 import java.io.*;
29 import java.util.LinkedHashMap;
30 import java.util.Map;
31 import java.util.Set;
32 import java.util.LinkedHashSet;
33 import java.util.function.ToIntFunction;
34
35 import javax.tools.JavaFileManager;
36 import javax.tools.FileObject;
37 import javax.tools.JavaFileManager.Location;
38 import javax.tools.JavaFileObject;
39
40 import com.sun.tools.javac.code.*;
41 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
42 import com.sun.tools.javac.code.Directive.*;
43 import com.sun.tools.javac.code.Scope.WriteableScope;
44 import com.sun.tools.javac.code.Source.Feature;
45 import com.sun.tools.javac.code.Symbol.*;
46 import com.sun.tools.javac.code.Type.*;
47 import com.sun.tools.javac.code.Types.SignatureGenerator.InvalidSignatureException;
48 import com.sun.tools.javac.comp.Check;
49 import com.sun.tools.javac.file.PathFileObject;
50 import com.sun.tools.javac.jvm.PoolConstant.LoadableConstant;
51 import com.sun.tools.javac.jvm.PoolConstant.Dynamic.BsmKey;
52 import com.sun.tools.javac.resources.CompilerProperties.Errors;
53 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
54 import com.sun.tools.javac.util.*;
55 import com.sun.tools.javac.util.List;
56
57 import static com.sun.tools.javac.code.Flags.*;
58 import static com.sun.tools.javac.code.Kinds.Kind.*;
59 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
60 import static com.sun.tools.javac.code.TypeTag.*;
61 import static com.sun.tools.javac.main.Option.*;
62
63 import static javax.tools.StandardLocation.CLASS_OUTPUT;
64
65 /** This class provides operations to map an internal symbol table graph
66 * rooted in a ClassSymbol into a classfile.
67 *
68 * <p><b>This is NOT part of any supported API.
69 * If you write code that depends on this, you do so at your own risk.
70 * This code and its internal interfaces are subject to change or
71 * deletion without notice.</b>
72 */
73 public class ClassWriter extends ClassFile {
74 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>();
75
76 private final Options options;
77
78 /** Switch: verbose output.
79 */
80 private boolean verbose;
81
82 /** Switch: emit source file attribute.
83 */
84 private boolean emitSourceFile;
85
86 /** Switch: generate CharacterRangeTable attribute.
87 */
88 private boolean genCrt;
89
90 /** Switch: describe the generated stackmap.
91 */
92 private boolean debugstackmap;
93
94 /** Preview language level.
95 */
96 private Preview preview;
97
98 /**
99 * Target class version.
100 */
101 private Target target;
102
103 /**
104 * Source language version.
105 */
106 private Source source;
107
108 /** Type utilities. */
109 private Types types;
110
111 private Check check;
112
113 private boolean allowPrimitiveClasses;
114
115 /**
116 * If true, class files will be written in module-specific subdirectories
117 * of the CLASS_OUTPUT location.
118 */
119 public boolean multiModuleMode;
120
121 private List<ToIntFunction<Symbol>> extraAttributeHooks = List.nil();
122
123 /** The initial sizes of the data and constant pool buffers.
124 * Sizes are increased when buffers get full.
125 */
126 static final int DATA_BUF_SIZE = 0x0fff0;
127 static final int CLASS_BUF_SIZE = 0x1fff0;
128
129 /** An output buffer for member info.
130 */
131 public ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
132
133 /** An output buffer for the constant pool.
134 */
135 ByteBuffer poolbuf = new ByteBuffer(CLASS_BUF_SIZE);
136
137 /** The constant pool writer.
138 */
139 final PoolWriter poolWriter;
140
141 /** The log to use for verbose output.
142 */
143 private final Log log;
144
145 /** The name table. */
146 private final Names names;
147
148 private final Symtab syms;
149
150 /** Access to files. */
151 private final JavaFileManager fileManager;
152
153 /** The tags and constants used in compressed stackmap. */
154 static final int SAME_FRAME_SIZE = 64;
155 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
156 static final int SAME_FRAME_EXTENDED = 251;
157 static final int FULL_FRAME = 255;
158 static final int MAX_LOCAL_LENGTH_DIFF = 4;
159
160 /** Get the ClassWriter instance for this context. */
161 public static ClassWriter instance(Context context) {
162 ClassWriter instance = context.get(classWriterKey);
163 if (instance == null)
164 instance = new ClassWriter(context);
165 return instance;
166 }
167
168 /** Construct a class writer, given an options table.
169 */
170 protected ClassWriter(Context context) {
171 context.put(classWriterKey, this);
172
173 log = Log.instance(context);
174 names = Names.instance(context);
175 options = Options.instance(context);
176 preview = Preview.instance(context);
177 target = Target.instance(context);
178 source = Source.instance(context);
179 types = Types.instance(context);
180 check = Check.instance(context);
181 fileManager = context.get(JavaFileManager.class);
182 poolWriter = Gen.instance(context).poolWriter;
183 syms = Symtab.instance(context);
184
185 verbose = options.isSet(VERBOSE);
186 genCrt = options.isSet(XJCOV);
187 debugstackmap = options.isSet("debug.stackmap");
188
189 emitSourceFile = options.isUnset(G_CUSTOM) ||
190 options.isSet(G_CUSTOM, "source");
191
192 String modifierFlags = options.get("debug.dumpmodifiers");
193 if (modifierFlags != null) {
194 dumpClassModifiers = modifierFlags.indexOf('c') != -1;
195 dumpFieldModifiers = modifierFlags.indexOf('f') != -1;
196 dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1;
197 dumpMethodModifiers = modifierFlags.indexOf('m') != -1;
198 }
199 Source source = Source.instance(context);
200 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source) && options.isSet("enablePrimitiveClasses");
201 }
202
203 public void addExtraAttributes(ToIntFunction<Symbol> addExtraAttributes) {
204 extraAttributeHooks = extraAttributeHooks.prepend(addExtraAttributes);
205 }
206
207 /******************************************************************
208 * Diagnostics: dump generated class names and modifiers
209 ******************************************************************/
210
211 /** Value of option 'dumpmodifiers' is a string
212 * indicating which modifiers should be dumped for debugging:
213 * 'c' -- classes
214 * 'f' -- fields
215 * 'i' -- innerclass attributes
216 * 'm' -- methods
217 * For example, to dump everything:
218 * javac -XDdumpmodifiers=cifm MyProg.java
219 */
220 private boolean dumpClassModifiers; // -XDdumpmodifiers=c
221 private boolean dumpFieldModifiers; // -XDdumpmodifiers=f
222 private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
223 private boolean dumpMethodModifiers; // -XDdumpmodifiers=m
224
225
226 /** Return flags as a string, separated by " ".
227 */
228 public static String flagNames(long flags) {
229 StringBuilder sbuf = new StringBuilder();
230 int i = 0;
231 long f = flags & StandardFlags;
232 while (f != 0) {
233 if ((f & 1) != 0) {
234 sbuf.append(" ");
235 sbuf.append(flagName[i]);
236 }
237 f = f >> 1;
238 i++;
239 }
240 return sbuf.toString();
241 }
242 //where
243 private static final String[] flagName = {
244 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
245 "IDENTITY", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
246 "ABSTRACT", "STRICTFP"};
247
248 /******************************************************************
249 * Output routines
250 ******************************************************************/
251
252 /** Write a character into given byte buffer;
253 * byte buffer will not be grown.
254 */
255 void putChar(ByteBuffer buf, int op, int x) {
256 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
257 buf.elems[op+1] = (byte)((x ) & 0xFF);
258 }
259
260 /** Write an integer into given byte buffer;
261 * byte buffer will not be grown.
262 */
263 void putInt(ByteBuffer buf, int adr, int x) {
264 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
265 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
266 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
267 buf.elems[adr+3] = (byte)((x ) & 0xFF);
268 }
269
270 /******************************************************************
271 * Writing the Constant Pool
272 ******************************************************************/
273
274 /** Thrown when the constant pool is over full.
275 */
276 public static class PoolOverflow extends RuntimeException {
277 private static final long serialVersionUID = 0;
278 public PoolOverflow() {}
279 }
280 public static class StringOverflow extends RuntimeException {
281 private static final long serialVersionUID = 0;
282 public final String value;
283 public StringOverflow(String s) {
284 value = s;
285 }
286 }
287
288 /******************************************************************
289 * Writing Attributes
290 ******************************************************************/
291
292 /** Write header for an attribute to data buffer and return
293 * position past attribute length index.
294 */
295 public int writeAttr(Name attrName) {
296 int index = poolWriter.putName(attrName);
297 databuf.appendChar(index);
298 databuf.appendInt(0);
299 return databuf.length;
300 }
301
302 /** Fill in attribute length.
303 */
304 public void endAttr(int index) {
305 putInt(databuf, index - 4, databuf.length - index);
306 }
307
308 /** Leave space for attribute count and return index for
309 * number of attributes field.
310 */
311 int beginAttrs() {
312 databuf.appendChar(0);
313 return databuf.length;
314 }
315
316 /** Fill in number of attributes.
317 */
318 void endAttrs(int index, int count) {
319 putChar(databuf, index - 2, count);
320 }
321
322 /** Write the EnclosingMethod attribute if needed.
323 * Returns the number of attributes written (0 or 1).
324 */
325 int writeEnclosingMethodAttribute(ClassSymbol c) {
326 return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
327 }
328
329 /** Write the EnclosingMethod attribute with a specified name.
330 * Returns the number of attributes written (0 or 1).
331 */
332 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
333 if (c.owner.kind != MTH && // neither a local class
334 c.name != names.empty) // nor anonymous
335 return 0;
336
337 int alenIdx = writeAttr(attributeName);
338 ClassSymbol enclClass = c.owner.enclClass();
339 MethodSymbol enclMethod =
340 (c.owner.type == null // local to init block
341 || c.owner.kind != MTH) // or member init
342 ? null
343 : ((MethodSymbol)c.owner).originalEnclosingMethod();
344 databuf.appendChar(poolWriter.putClass(enclClass));
345 databuf.appendChar(enclMethod == null ? 0 : poolWriter.putNameAndType(enclMethod));
346 endAttr(alenIdx);
347 return 1;
348 }
349
350 /** Write flag attributes; return number of attributes written.
351 */
352 int writeFlagAttrs(long flags) {
353 int acount = 0;
354 if ((flags & DEPRECATED) != 0) {
355 int alenIdx = writeAttr(names.Deprecated);
356 endAttr(alenIdx);
357 acount++;
358 }
359 return acount;
360 }
361
362 /** Write member (field or method) attributes;
363 * return number of attributes written.
364 */
365 int writeMemberAttrs(Symbol sym, boolean isRecordComponent) {
366 int acount = 0;
367 if (!isRecordComponent) {
368 acount = writeFlagAttrs(sym.flags());
369 }
370 long flags = sym.flags();
371 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC &&
372 (flags & ANONCONSTR) == 0 &&
373 (!types.isSameType(sym.type, sym.erasure(types)) ||
374 poolWriter.signatureGen.hasTypeVar(sym.type.getThrownTypes()))) {
375 // note that a local class with captured variables
376 // will get a signature attribute
377 int alenIdx = writeAttr(names.Signature);
378 databuf.appendChar(poolWriter.putSignature(sym));
379 endAttr(alenIdx);
380 acount++;
381 }
382 acount += writeJavaAnnotations(sym.getRawAttributes());
383 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false);
384 return acount;
385 }
386
387 /**
388 * Write method parameter names attribute.
389 */
390 int writeMethodParametersAttr(MethodSymbol m) {
391 MethodType ty = m.externalType(types).asMethodType();
392 final int allparams = ty.argtypes.size();
393 if (m.params != null && allparams != 0) {
394 final int attrIndex = writeAttr(names.MethodParameters);
395 databuf.appendByte(allparams);
396 // Write extra parameters first
397 for (VarSymbol s : m.extraParams) {
398 final int flags =
399 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
400 ((int) m.flags() & SYNTHETIC);
401 databuf.appendChar(poolWriter.putName(s.name));
402 databuf.appendChar(flags);
403 }
404 // Now write the real parameters
405 for (VarSymbol s : m.params) {
406 final int flags =
407 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
408 ((int) m.flags() & SYNTHETIC);
409 databuf.appendChar(poolWriter.putName(s.name));
410 databuf.appendChar(flags);
411 }
412 // Now write the captured locals
413 for (VarSymbol s : m.capturedLocals) {
414 final int flags =
415 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
416 ((int) m.flags() & SYNTHETIC);
417 databuf.appendChar(poolWriter.putName(s.name));
418 databuf.appendChar(flags);
419 }
420 endAttr(attrIndex);
421 return 1;
422 } else
423 return 0;
424 }
425
426 private void writeParamAnnotations(List<VarSymbol> params,
427 RetentionPolicy retention) {
428 databuf.appendByte(params.length());
429 for (VarSymbol s : params) {
430 ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
431 for (Attribute.Compound a : s.getRawAttributes())
432 if (types.getRetention(a) == retention)
433 buf.append(a);
434 databuf.appendChar(buf.length());
435 for (Attribute.Compound a : buf)
436 writeCompoundAttribute(a);
437 }
438
439 }
440
441 private void writeParamAnnotations(MethodSymbol m,
442 RetentionPolicy retention) {
443 databuf.appendByte(m.params.length());
444 writeParamAnnotations(m.params, retention);
445 }
446
447 /** Write method parameter annotations;
448 * return number of attributes written.
449 */
450 int writeParameterAttrs(List<VarSymbol> vars) {
451 boolean hasVisible = false;
452 boolean hasInvisible = false;
453 if (vars != null) {
454 for (VarSymbol s : vars) {
455 for (Attribute.Compound a : s.getRawAttributes()) {
456 switch (types.getRetention(a)) {
457 case SOURCE: break;
458 case CLASS: hasInvisible = true; break;
459 case RUNTIME: hasVisible = true; break;
460 default: // /* fail soft */ throw new AssertionError(vis);
461 }
462 }
463 }
464 }
465
466 int attrCount = 0;
467 if (hasVisible) {
468 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
469 writeParamAnnotations(vars, RetentionPolicy.RUNTIME);
470 endAttr(attrIndex);
471 attrCount++;
472 }
473 if (hasInvisible) {
474 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
475 writeParamAnnotations(vars, RetentionPolicy.CLASS);
476 endAttr(attrIndex);
477 attrCount++;
478 }
479 return attrCount;
480 }
481
482 /**********************************************************************
483 * Writing Java-language annotations (aka metadata, attributes)
484 **********************************************************************/
485
486 /** Write Java-language annotations; return number of JVM
487 * attributes written (zero or one).
488 */
489 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
490 if (attrs.isEmpty()) return 0;
491 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>();
492 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>();
493 for (Attribute.Compound a : attrs) {
494 switch (types.getRetention(a)) {
495 case SOURCE: break;
496 case CLASS: invisibles.append(a); break;
497 case RUNTIME: visibles.append(a); break;
498 default: // /* fail soft */ throw new AssertionError(vis);
499 }
500 }
501
502 int attrCount = 0;
503 if (visibles.length() != 0) {
504 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
505 databuf.appendChar(visibles.length());
506 for (Attribute.Compound a : visibles)
507 writeCompoundAttribute(a);
508 endAttr(attrIndex);
509 attrCount++;
510 }
511 if (invisibles.length() != 0) {
512 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
513 databuf.appendChar(invisibles.length());
514 for (Attribute.Compound a : invisibles)
515 writeCompoundAttribute(a);
516 endAttr(attrIndex);
517 attrCount++;
518 }
519 return attrCount;
520 }
521
522 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) {
523 if (typeAnnos.isEmpty()) return 0;
524
525 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>();
526 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>();
527
528 for (Attribute.TypeCompound tc : typeAnnos) {
529 if (tc.hasUnknownPosition()) {
530 boolean fixed = tc.tryFixPosition();
531
532 // Could we fix it?
533 if (!fixed) {
534 // This happens for nested types like @A Outer. @B Inner.
535 // For method parameters we get the annotation twice! Once with
536 // a valid position, once unknown.
537 // TODO: find a cleaner solution.
538 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
539 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
540 continue;
541 }
542 }
543
544 if (tc.position.type.isLocal() != inCode)
545 continue;
546 if (!tc.position.emitToClassfile())
547 continue;
548 switch (types.getRetention(tc)) {
549 case SOURCE: break;
550 case CLASS: invisibles.append(tc); break;
551 case RUNTIME: visibles.append(tc); break;
552 default: // /* fail soft */ throw new AssertionError(vis);
553 }
554 }
555
556 int attrCount = 0;
557 if (visibles.length() != 0) {
558 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
559 databuf.appendChar(visibles.length());
560 for (Attribute.TypeCompound p : visibles)
561 writeTypeAnnotation(p);
562 endAttr(attrIndex);
563 attrCount++;
564 }
565
566 if (invisibles.length() != 0) {
567 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
568 databuf.appendChar(invisibles.length());
569 for (Attribute.TypeCompound p : invisibles)
570 writeTypeAnnotation(p);
571 endAttr(attrIndex);
572 attrCount++;
573 }
574
575 return attrCount;
576 }
577
578 /** A visitor to write an attribute including its leading
579 * single-character marker.
580 */
581 class AttributeWriter implements Attribute.Visitor {
582 public void visitConstant(Attribute.Constant _value) {
583 if (_value.type.getTag() == CLASS) {
584 Assert.check(_value.value instanceof String);
585 String s = (String)_value.value;
586 databuf.appendByte('s');
587 databuf.appendChar(poolWriter.putName(names.fromString(s)));
588 } else {
589 switch (_value.type.getTag()) {
590 case BYTE:
591 databuf.appendByte('B');
592 break;
593 case CHAR:
594 databuf.appendByte('C');
595 break;
596 case SHORT:
597 databuf.appendByte('S');
598 break;
599 case INT:
600 databuf.appendByte('I');
601 break;
602 case LONG:
603 databuf.appendByte('J');
604 break;
605 case FLOAT:
606 databuf.appendByte('F');
607 break;
608 case DOUBLE:
609 databuf.appendByte('D');
610 break;
611 case BOOLEAN:
612 databuf.appendByte('Z');
613 break;
614 default:
615 throw new AssertionError(_value.type);
616 }
617 databuf.appendChar(poolWriter.putConstant(_value.value));
618 }
619 }
620 public void visitEnum(Attribute.Enum e) {
621 databuf.appendByte('e');
622 databuf.appendChar(poolWriter.putDescriptor(e.value.type));
623 databuf.appendChar(poolWriter.putName(e.value.name));
624 }
625 public void visitClass(Attribute.Class clazz) {
626 databuf.appendByte('c');
627 databuf.appendChar(poolWriter.putDescriptor(clazz.classType));
628 }
629 public void visitCompound(Attribute.Compound compound) {
630 databuf.appendByte('@');
631 writeCompoundAttribute(compound);
632 }
633 public void visitError(Attribute.Error x) {
634 throw new AssertionError(x);
635 }
636 public void visitArray(Attribute.Array array) {
637 databuf.appendByte('[');
638 databuf.appendChar(array.values.length);
639 for (Attribute a : array.values) {
640 a.accept(this);
641 }
642 }
643 }
644 AttributeWriter awriter = new AttributeWriter();
645
646 /** Write a compound attribute excluding the '@' marker. */
647 void writeCompoundAttribute(Attribute.Compound c) {
648 databuf.appendChar(poolWriter.putDescriptor(c.type));
649 databuf.appendChar(c.values.length());
650 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
651 databuf.appendChar(poolWriter.putName(p.fst.name));
652 p.snd.accept(awriter);
653 }
654 }
655
656 void writeTypeAnnotation(Attribute.TypeCompound c) {
657 writePosition(c.position);
658 writeCompoundAttribute(c);
659 }
660
661 void writePosition(TypeAnnotationPosition p) {
662 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
663 switch (p.type) {
664 // instanceof
665 case INSTANCEOF:
666 // new expression
667 case NEW:
668 // constructor/method reference receiver
669 case CONSTRUCTOR_REFERENCE:
670 case METHOD_REFERENCE:
671 databuf.appendChar(p.offset);
672 break;
673 // local variable
674 case LOCAL_VARIABLE:
675 // resource variable
676 case RESOURCE_VARIABLE:
677 databuf.appendChar(p.lvarOffset.length); // for table length
678 for (int i = 0; i < p.lvarOffset.length; ++i) {
679 databuf.appendChar(p.lvarOffset[i]);
680 databuf.appendChar(p.lvarLength[i]);
681 databuf.appendChar(p.lvarIndex[i]);
682 }
683 break;
684 // exception parameter
685 case EXCEPTION_PARAMETER:
686 databuf.appendChar(p.getExceptionIndex());
687 break;
688 // method receiver
689 case METHOD_RECEIVER:
690 // Do nothing
691 break;
692 // type parameter
693 case CLASS_TYPE_PARAMETER:
694 case METHOD_TYPE_PARAMETER:
695 databuf.appendByte(p.parameter_index);
696 break;
697 // type parameter bound
698 case CLASS_TYPE_PARAMETER_BOUND:
699 case METHOD_TYPE_PARAMETER_BOUND:
700 databuf.appendByte(p.parameter_index);
701 databuf.appendByte(p.bound_index);
702 break;
703 // class extends or implements clause
704 case CLASS_EXTENDS:
705 databuf.appendChar(p.type_index);
706 break;
707 // throws
708 case THROWS:
709 databuf.appendChar(p.type_index);
710 break;
711 // method parameter
712 case METHOD_FORMAL_PARAMETER:
713 databuf.appendByte(p.parameter_index);
714 break;
715 // type cast
716 case CAST:
717 // method/constructor/reference type argument
718 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
719 case METHOD_INVOCATION_TYPE_ARGUMENT:
720 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
721 case METHOD_REFERENCE_TYPE_ARGUMENT:
722 databuf.appendChar(p.offset);
723 databuf.appendByte(p.type_index);
724 break;
725 // We don't need to worry about these
726 case METHOD_RETURN:
727 case FIELD:
728 break;
729 case UNKNOWN:
730 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
731 default:
732 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
733 }
734
735 { // Append location data for generics/arrays.
736 databuf.appendByte(p.location.size());
737 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
738 for (int i : loc)
739 databuf.appendByte((byte)i);
740 }
741 }
742
743 /**********************************************************************
744 * Writing module attributes
745 **********************************************************************/
746
747 /** Write the Module attribute if needed.
748 * Returns the number of attributes written (0 or 1).
749 */
750 int writeModuleAttribute(ClassSymbol c) {
751 ModuleSymbol m = (ModuleSymbol) c.owner;
752
753 int alenIdx = writeAttr(names.Module);
754
755 databuf.appendChar(poolWriter.putModule(m));
756 databuf.appendChar(ModuleFlags.value(m.flags)); // module_flags
757 databuf.appendChar(m.version != null ? poolWriter.putName(m.version) : 0);
758
759 ListBuffer<RequiresDirective> requires = new ListBuffer<>();
760 for (RequiresDirective r: m.requires) {
761 if (!r.flags.contains(RequiresFlag.EXTRA))
762 requires.add(r);
763 }
764 databuf.appendChar(requires.size());
765 for (RequiresDirective r: requires) {
766 databuf.appendChar(poolWriter.putModule(r.module));
767 databuf.appendChar(RequiresFlag.value(r.flags));
768 databuf.appendChar(r.module.version != null ? poolWriter.putName(r.module.version) : 0);
769 }
770
771 List<ExportsDirective> exports = m.exports;
772 databuf.appendChar(exports.size());
773 for (ExportsDirective e: exports) {
774 databuf.appendChar(poolWriter.putPackage(e.packge));
775 databuf.appendChar(ExportsFlag.value(e.flags));
776 if (e.modules == null) {
777 databuf.appendChar(0);
778 } else {
779 databuf.appendChar(e.modules.size());
780 for (ModuleSymbol msym: e.modules) {
781 databuf.appendChar(poolWriter.putModule(msym));
782 }
783 }
784 }
785
786 List<OpensDirective> opens = m.opens;
787 databuf.appendChar(opens.size());
788 for (OpensDirective o: opens) {
789 databuf.appendChar(poolWriter.putPackage(o.packge));
790 databuf.appendChar(OpensFlag.value(o.flags));
791 if (o.modules == null) {
792 databuf.appendChar(0);
793 } else {
794 databuf.appendChar(o.modules.size());
795 for (ModuleSymbol msym: o.modules) {
796 databuf.appendChar(poolWriter.putModule(msym));
797 }
798 }
799 }
800
801 List<UsesDirective> uses = m.uses;
802 databuf.appendChar(uses.size());
803 for (UsesDirective s: uses) {
804 databuf.appendChar(poolWriter.putClass(s.service));
805 }
806
807 // temporary fix to merge repeated provides clause for same service;
808 // eventually this should be disallowed when analyzing the module,
809 // so that each service type only appears once.
810 Map<ClassSymbol, Set<ClassSymbol>> mergedProvides = new LinkedHashMap<>();
811 for (ProvidesDirective p : m.provides) {
812 mergedProvides.computeIfAbsent(p.service, s -> new LinkedHashSet<>()).addAll(p.impls);
813 }
814 databuf.appendChar(mergedProvides.size());
815 mergedProvides.forEach((srvc, impls) -> {
816 databuf.appendChar(poolWriter.putClass(srvc));
817 databuf.appendChar(impls.size());
818 impls.forEach(impl -> databuf.appendChar(poolWriter.putClass(impl)));
819 });
820
821 endAttr(alenIdx);
822 return 1;
823 }
824
825 /**********************************************************************
826 * Writing Objects
827 **********************************************************************/
828
829 /** Write "inner classes" attribute.
830 */
831 void writeInnerClasses() {
832 int alenIdx = writeAttr(names.InnerClasses);
833 databuf.appendChar(poolWriter.innerClasses.size());
834 for (ClassSymbol inner : poolWriter.innerClasses) {
835 inner.markAbstractIfNeeded(types);
836 int flags = adjustFlags(inner.flags_field);
837 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
838 if (dumpInnerClassModifiers) {
839 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
840 pw.println("INNERCLASS " + inner.name);
841 pw.println("---" + flagNames(flags));
842 }
843 databuf.appendChar(poolWriter.putClass(inner));
844 databuf.appendChar(
845 inner.owner.kind == TYP && !inner.name.isEmpty() ? poolWriter.putClass((ClassSymbol)inner.owner) : 0);
846 databuf.appendChar(
847 !inner.name.isEmpty() ? poolWriter.putName(inner.name) : 0);
848 databuf.appendChar(flags);
849 }
850 endAttr(alenIdx);
851 }
852
853 /** Write out "Preload" attribute by enumerating the value classes encountered in field/method descriptors during this compilation.
854 */
855 void writePreloadAttribute() {
856 int alenIdx = writeAttr(names.Preload);
857 databuf.appendChar(poolWriter.preloadClasses.size());
858 for (ClassSymbol c : poolWriter.preloadClasses) {
859 databuf.appendChar(poolWriter.putClass(c));
860 }
861 endAttr(alenIdx);
862 }
863
864 int writeRecordAttribute(ClassSymbol csym) {
865 int alenIdx = writeAttr(names.Record);
866 Scope s = csym.members();
867 databuf.appendChar(csym.getRecordComponents().size());
868 for (VarSymbol v: csym.getRecordComponents()) {
869 //databuf.appendChar(poolWriter.putMember(v.accessor.head.snd));
870 databuf.appendChar(poolWriter.putName(v.name));
871 databuf.appendChar(poolWriter.putDescriptor(v));
872 int acountIdx = beginAttrs();
873 int acount = 0;
874 acount += writeMemberAttrs(v, true);
875 endAttrs(acountIdx, acount);
876 }
877 endAttr(alenIdx);
878 return 1;
879 }
880
881 /**
882 * Write NestMembers attribute (if needed)
883 */
884 int writeNestMembersIfNeeded(ClassSymbol csym) {
885 ListBuffer<ClassSymbol> nested = new ListBuffer<>();
886 listNested(csym, nested);
887 Set<ClassSymbol> nestedUnique = new LinkedHashSet<>(nested);
888 if (csym.owner.kind == PCK && !nestedUnique.isEmpty()) {
889 int alenIdx = writeAttr(names.NestMembers);
890 databuf.appendChar(nestedUnique.size());
891 for (ClassSymbol s : nestedUnique) {
892 databuf.appendChar(poolWriter.putClass(s));
893 }
894 endAttr(alenIdx);
895 return 1;
896 }
897 return 0;
898 }
899
900 /**
901 * Write NestHost attribute (if needed)
902 */
903 int writeNestHostIfNeeded(ClassSymbol csym) {
904 if (csym.owner.kind != PCK) {
905 int alenIdx = writeAttr(names.NestHost);
906 databuf.appendChar(poolWriter.putClass(csym.outermostClass()));
907 endAttr(alenIdx);
908 return 1;
909 }
910 return 0;
911 }
912
913 private void listNested(Symbol sym, ListBuffer<ClassSymbol> seen) {
914 if (sym.kind != TYP) return;
915 ClassSymbol csym = (ClassSymbol)sym;
916 if (csym.owner.kind != PCK) {
917 seen.add(csym);
918 }
919 if (csym.members() != null) {
920 for (Symbol s : sym.members().getSymbols()) {
921 listNested(s, seen);
922 }
923 }
924 if (csym.trans_local != null) {
925 for (Symbol s : csym.trans_local) {
926 listNested(s, seen);
927 }
928 }
929 }
930
931 /** Write "PermittedSubclasses" attribute.
932 */
933 int writePermittedSubclassesIfNeeded(ClassSymbol csym) {
934 if (csym.permitted.nonEmpty()) {
935 int alenIdx = writeAttr(names.PermittedSubclasses);
936 databuf.appendChar(csym.permitted.size());
937 for (Symbol c : csym.permitted) {
938 databuf.appendChar(poolWriter.putClass((ClassSymbol) c));
939 }
940 endAttr(alenIdx);
941 return 1;
942 }
943 return 0;
944 }
945
946 /** Write "bootstrapMethods" attribute.
947 */
948 void writeBootstrapMethods() {
949 int alenIdx = writeAttr(names.BootstrapMethods);
950 databuf.appendChar(poolWriter.bootstrapMethods.size());
951 for (BsmKey bsmKey : poolWriter.bootstrapMethods.keySet()) {
952 //write BSM handle
953 databuf.appendChar(poolWriter.putConstant(bsmKey.bsm));
954 LoadableConstant[] uniqueArgs = bsmKey.staticArgs;
955 //write static args length
956 databuf.appendChar(uniqueArgs.length);
957 //write static args array
958 for (LoadableConstant arg : uniqueArgs) {
959 databuf.appendChar(poolWriter.putConstant(arg));
960 }
961 }
962 endAttr(alenIdx);
963 }
964
965 /** Write field symbol, entering all references into constant pool.
966 */
967 void writeField(VarSymbol v) {
968 int flags = adjustFlags(v.flags());
969 databuf.appendChar(flags);
970 if (dumpFieldModifiers) {
971 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
972 pw.println("FIELD " + v.name);
973 pw.println("---" + flagNames(v.flags()));
974 }
975 databuf.appendChar(poolWriter.putName(v.name));
976 databuf.appendChar(poolWriter.putDescriptor(v));
977 Type fldType = v.erasure(types);
978 if (fldType.requiresPreload(v.owner)) {
979 poolWriter.enterPreloadClass((ClassSymbol) fldType.tsym);
980 }
981 int acountIdx = beginAttrs();
982 int acount = 0;
983 if (v.getConstValue() != null) {
984 int alenIdx = writeAttr(names.ConstantValue);
985 databuf.appendChar(poolWriter.putConstant(v.getConstValue()));
986 endAttr(alenIdx);
987 acount++;
988 }
989 acount += writeMemberAttrs(v, false);
990 acount += writeExtraAttributes(v);
991 endAttrs(acountIdx, acount);
992 }
993
994 /** Write method symbol, entering all references into constant pool.
995 */
996 void writeMethod(MethodSymbol m) {
997 int flags = adjustFlags(m.flags());
998 databuf.appendChar(flags);
999 if (dumpMethodModifiers) {
1000 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1001 pw.println("METHOD " + m.name);
1002 pw.println("---" + flagNames(m.flags()));
1003 }
1004 databuf.appendChar(poolWriter.putName(m.name));
1005 databuf.appendChar(poolWriter.putDescriptor(m));
1006 MethodType mtype = (MethodType) m.externalType(types);
1007 for (Type t : mtype.getParameterTypes()) {
1008 if (t.requiresPreload(m.owner)) {
1009 poolWriter.enterPreloadClass((ClassSymbol) t.tsym);
1010 }
1011 }
1012 Type returnType = mtype.getReturnType();
1013 if (returnType.requiresPreload(m.owner)) {
1014 poolWriter.enterPreloadClass((ClassSymbol) returnType.tsym);
1015 }
1016 int acountIdx = beginAttrs();
1017 int acount = 0;
1018 if (m.code != null) {
1019 int alenIdx = writeAttr(names.Code);
1020 writeCode(m.code);
1021 m.code = null; // to conserve space
1022 endAttr(alenIdx);
1023 acount++;
1024 }
1025 List<Type> thrown = m.erasure(types).getThrownTypes();
1026 if (thrown.nonEmpty()) {
1027 int alenIdx = writeAttr(names.Exceptions);
1028 databuf.appendChar(thrown.length());
1029 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1030 databuf.appendChar(poolWriter.putClass(l.head));
1031 endAttr(alenIdx);
1032 acount++;
1033 }
1034 if (m.defaultValue != null) {
1035 int alenIdx = writeAttr(names.AnnotationDefault);
1036 m.defaultValue.accept(awriter);
1037 endAttr(alenIdx);
1038 acount++;
1039 }
1040 if (target.hasMethodParameters() && (
1041 options.isSet(PARAMETERS)
1042 || ((m.flags_field & RECORD) != 0 && (m.isInitOrVNew() || m.isValueObjectFactory())))) {
1043 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies.
1044 acount += writeMethodParametersAttr(m);
1045 }
1046 acount += writeMemberAttrs(m, false);
1047 if (!m.isLambdaMethod())
1048 acount += writeParameterAttrs(m.params);
1049 acount += writeExtraAttributes(m);
1050 endAttrs(acountIdx, acount);
1051 }
1052
1053 /** Write code attribute of method.
1054 */
1055 void writeCode(Code code) {
1056 databuf.appendChar(code.max_stack);
1057 databuf.appendChar(code.max_locals);
1058 databuf.appendInt(code.cp);
1059 databuf.appendBytes(code.code, 0, code.cp);
1060 databuf.appendChar(code.catchInfo.length());
1061 for (List<char[]> l = code.catchInfo.toList();
1062 l.nonEmpty();
1063 l = l.tail) {
1064 for (int i = 0; i < l.head.length; i++)
1065 databuf.appendChar(l.head[i]);
1066 }
1067 int acountIdx = beginAttrs();
1068 int acount = 0;
1069
1070 if (code.lineInfo.nonEmpty()) {
1071 int alenIdx = writeAttr(names.LineNumberTable);
1072 databuf.appendChar(code.lineInfo.length());
1073 for (List<char[]> l = code.lineInfo.reverse();
1074 l.nonEmpty();
1075 l = l.tail)
1076 for (int i = 0; i < l.head.length; i++)
1077 databuf.appendChar(l.head[i]);
1078 endAttr(alenIdx);
1079 acount++;
1080 }
1081
1082 if (genCrt && (code.crt != null)) {
1083 CRTable crt = code.crt;
1084 int alenIdx = writeAttr(names.CharacterRangeTable);
1085 int crtIdx = beginAttrs();
1086 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1087 endAttrs(crtIdx, crtEntries);
1088 endAttr(alenIdx);
1089 acount++;
1090 }
1091
1092 // counter for number of generic local variables
1093 if (code.varDebugInfo && code.varBufferSize > 0) {
1094 int nGenericVars = 0;
1095 int alenIdx = writeAttr(names.LocalVariableTable);
1096 databuf.appendChar(code.getLVTSize());
1097 for (int i=0; i<code.varBufferSize; i++) {
1098 Code.LocalVar var = code.varBuffer[i];
1099
1100 for (Code.LocalVar.Range r: var.aliveRanges) {
1101 // write variable info
1102 Assert.check(r.start_pc >= 0
1103 && r.start_pc <= code.cp);
1104 databuf.appendChar(r.start_pc);
1105 Assert.check(r.length > 0
1106 && (r.start_pc + r.length) <= code.cp);
1107 databuf.appendChar(r.length);
1108 VarSymbol sym = var.sym;
1109 databuf.appendChar(poolWriter.putName(sym.name));
1110 databuf.appendChar(poolWriter.putDescriptor(sym));
1111 databuf.appendChar(var.reg);
1112 if (needsLocalVariableTypeEntry(var.sym.type)) {
1113 nGenericVars++;
1114 }
1115 }
1116 }
1117 endAttr(alenIdx);
1118 acount++;
1119
1120 if (nGenericVars > 0) {
1121 alenIdx = writeAttr(names.LocalVariableTypeTable);
1122 databuf.appendChar(nGenericVars);
1123 int count = 0;
1124
1125 for (int i=0; i<code.varBufferSize; i++) {
1126 Code.LocalVar var = code.varBuffer[i];
1127 VarSymbol sym = var.sym;
1128 if (!needsLocalVariableTypeEntry(sym.type))
1129 continue;
1130 for (Code.LocalVar.Range r : var.aliveRanges) {
1131 // write variable info
1132 databuf.appendChar(r.start_pc);
1133 databuf.appendChar(r.length);
1134 databuf.appendChar(poolWriter.putName(sym.name));
1135 databuf.appendChar(poolWriter.putSignature(sym));
1136 databuf.appendChar(var.reg);
1137 count++;
1138 }
1139 }
1140 Assert.check(count == nGenericVars);
1141 endAttr(alenIdx);
1142 acount++;
1143 }
1144 }
1145
1146 if (code.stackMapBufferSize > 0) {
1147 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1148 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1149 writeStackMap(code);
1150 endAttr(alenIdx);
1151 acount++;
1152 }
1153
1154 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
1155
1156 endAttrs(acountIdx, acount);
1157 }
1158 //where
1159 private boolean needsLocalVariableTypeEntry(Type t) {
1160 //a local variable needs a type-entry if its type T is generic
1161 //(i.e. |T| != T) and if it's not an non-denotable type (non-denotable
1162 // types are not supported in signature attribute grammar!)
1163 return !types.isSameType(t, types.erasure(t)) &&
1164 check.checkDenotable(t);
1165 }
1166
1167 void writeStackMap(Code code) {
1168 int nframes = code.stackMapBufferSize;
1169 if (debugstackmap) System.out.println(" nframes = " + nframes);
1170 databuf.appendChar(nframes);
1171
1172 switch (code.stackMap) {
1173 case CLDC:
1174 for (int i=0; i<nframes; i++) {
1175 if (debugstackmap) System.out.print(" " + i + ":");
1176 Code.StackMapFrame frame = code.stackMapBuffer[i];
1177
1178 // output PC
1179 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1180 databuf.appendChar(frame.pc);
1181
1182 // output locals
1183 int localCount = 0;
1184 for (int j=0; j<frame.locals.length;
1185 j += Code.width(frame.locals[j])) {
1186 localCount++;
1187 }
1188 if (debugstackmap) System.out.print(" nlocals=" +
1189 localCount);
1190 databuf.appendChar(localCount);
1191 for (int j=0; j<frame.locals.length;
1192 j += Code.width(frame.locals[j])) {
1193 if (debugstackmap) System.out.print(" local[" + j + "]=");
1194 writeStackMapType(frame.locals[j]);
1195 }
1196
1197 // output stack
1198 int stackCount = 0;
1199 for (int j=0; j<frame.stack.length;
1200 j += Code.width(frame.stack[j])) {
1201 stackCount++;
1202 }
1203 if (debugstackmap) System.out.print(" nstack=" +
1204 stackCount);
1205 databuf.appendChar(stackCount);
1206 for (int j=0; j<frame.stack.length;
1207 j += Code.width(frame.stack[j])) {
1208 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1209 writeStackMapType(frame.stack[j]);
1210 }
1211 if (debugstackmap) System.out.println();
1212 }
1213 break;
1214 case JSR202: {
1215 Assert.checkNull(code.stackMapBuffer);
1216 for (int i=0; i<nframes; i++) {
1217 if (debugstackmap) System.out.print(" " + i + ":");
1218 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1219 frame.write(this);
1220 if (debugstackmap) System.out.println();
1221 }
1222 break;
1223 }
1224 default:
1225 throw new AssertionError("Unexpected stackmap format value");
1226 }
1227 }
1228
1229 //where
1230 void writeStackMapType(Type t) {
1231 if (t == null) {
1232 if (debugstackmap) System.out.print("empty");
1233 databuf.appendByte(0);
1234 }
1235 else switch(t.getTag()) {
1236 case BYTE:
1237 case CHAR:
1238 case SHORT:
1239 case INT:
1240 case BOOLEAN:
1241 if (debugstackmap) System.out.print("int");
1242 databuf.appendByte(1);
1243 break;
1244 case FLOAT:
1245 if (debugstackmap) System.out.print("float");
1246 databuf.appendByte(2);
1247 break;
1248 case DOUBLE:
1249 if (debugstackmap) System.out.print("double");
1250 databuf.appendByte(3);
1251 break;
1252 case LONG:
1253 if (debugstackmap) System.out.print("long");
1254 databuf.appendByte(4);
1255 break;
1256 case BOT: // null
1257 if (debugstackmap) System.out.print("null");
1258 databuf.appendByte(5);
1259 break;
1260 case CLASS:
1261 case ARRAY:
1262 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1263 databuf.appendByte(7);
1264 databuf.appendChar(allowPrimitiveClasses && t.isPrimitiveClass() ? poolWriter.putClass(new ConstantPoolQType(types.erasure(t), types)) : poolWriter.putClass(types.erasure(t)));
1265 break;
1266 case TYPEVAR:
1267 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1268 databuf.appendByte(7);
1269 databuf.appendChar(poolWriter.putClass(types.erasure(t)));
1270 break;
1271 case UNINITIALIZED_THIS:
1272 if (debugstackmap) System.out.print("uninit_this");
1273 databuf.appendByte(6);
1274 break;
1275 case UNINITIALIZED_OBJECT:
1276 { UninitializedType uninitType = (UninitializedType)t;
1277 databuf.appendByte(8);
1278 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1279 databuf.appendChar(uninitType.offset);
1280 }
1281 break;
1282 default:
1283 throw new AssertionError();
1284 }
1285 }
1286
1287 /** An entry in the JSR202 StackMapTable */
1288 abstract static class StackMapTableFrame {
1289 abstract int getFrameType();
1290
1291 void write(ClassWriter writer) {
1292 int frameType = getFrameType();
1293 writer.databuf.appendByte(frameType);
1294 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1295 }
1296
1297 static class SameFrame extends StackMapTableFrame {
1298 final int offsetDelta;
1299 SameFrame(int offsetDelta) {
1300 this.offsetDelta = offsetDelta;
1301 }
1302 int getFrameType() {
1303 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1304 }
1305 @Override
1306 void write(ClassWriter writer) {
1307 super.write(writer);
1308 if (getFrameType() == SAME_FRAME_EXTENDED) {
1309 writer.databuf.appendChar(offsetDelta);
1310 if (writer.debugstackmap){
1311 System.out.print(" offset_delta=" + offsetDelta);
1312 }
1313 }
1314 }
1315 }
1316
1317 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1318 final int offsetDelta;
1319 final Type stack;
1320 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1321 this.offsetDelta = offsetDelta;
1322 this.stack = stack;
1323 }
1324 int getFrameType() {
1325 return (offsetDelta < SAME_FRAME_SIZE) ?
1326 (SAME_FRAME_SIZE + offsetDelta) :
1327 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1328 }
1329 @Override
1330 void write(ClassWriter writer) {
1331 super.write(writer);
1332 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1333 writer.databuf.appendChar(offsetDelta);
1334 if (writer.debugstackmap) {
1335 System.out.print(" offset_delta=" + offsetDelta);
1336 }
1337 }
1338 if (writer.debugstackmap) {
1339 System.out.print(" stack[" + 0 + "]=");
1340 }
1341 writer.writeStackMapType(stack);
1342 }
1343 }
1344
1345 static class ChopFrame extends StackMapTableFrame {
1346 final int frameType;
1347 final int offsetDelta;
1348 ChopFrame(int frameType, int offsetDelta) {
1349 this.frameType = frameType;
1350 this.offsetDelta = offsetDelta;
1351 }
1352 int getFrameType() { return frameType; }
1353 @Override
1354 void write(ClassWriter writer) {
1355 super.write(writer);
1356 writer.databuf.appendChar(offsetDelta);
1357 if (writer.debugstackmap) {
1358 System.out.print(" offset_delta=" + offsetDelta);
1359 }
1360 }
1361 }
1362
1363 static class AppendFrame extends StackMapTableFrame {
1364 final int frameType;
1365 final int offsetDelta;
1366 final Type[] locals;
1367 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1368 this.frameType = frameType;
1369 this.offsetDelta = offsetDelta;
1370 this.locals = locals;
1371 }
1372 int getFrameType() { return frameType; }
1373 @Override
1374 void write(ClassWriter writer) {
1375 super.write(writer);
1376 writer.databuf.appendChar(offsetDelta);
1377 if (writer.debugstackmap) {
1378 System.out.print(" offset_delta=" + offsetDelta);
1379 }
1380 for (int i=0; i<locals.length; i++) {
1381 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1382 writer.writeStackMapType(locals[i]);
1383 }
1384 }
1385 }
1386
1387 static class FullFrame extends StackMapTableFrame {
1388 final int offsetDelta;
1389 final Type[] locals;
1390 final Type[] stack;
1391 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1392 this.offsetDelta = offsetDelta;
1393 this.locals = locals;
1394 this.stack = stack;
1395 }
1396 int getFrameType() { return FULL_FRAME; }
1397 @Override
1398 void write(ClassWriter writer) {
1399 super.write(writer);
1400 writer.databuf.appendChar(offsetDelta);
1401 writer.databuf.appendChar(locals.length);
1402 if (writer.debugstackmap) {
1403 System.out.print(" offset_delta=" + offsetDelta);
1404 System.out.print(" nlocals=" + locals.length);
1405 }
1406 for (int i=0; i<locals.length; i++) {
1407 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1408 writer.writeStackMapType(locals[i]);
1409 }
1410
1411 writer.databuf.appendChar(stack.length);
1412 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1413 for (int i=0; i<stack.length; i++) {
1414 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1415 writer.writeStackMapType(stack[i]);
1416 }
1417 }
1418 }
1419
1420 /** Compare this frame with the previous frame and produce
1421 * an entry of compressed stack map frame. */
1422 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1423 int prev_pc,
1424 Type[] prev_locals,
1425 Types types) {
1426 Type[] locals = this_frame.locals;
1427 Type[] stack = this_frame.stack;
1428 int offset_delta = this_frame.pc - prev_pc - 1;
1429 if (stack.length == 1) {
1430 if (locals.length == prev_locals.length
1431 && compare(prev_locals, locals, types) == 0) {
1432 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1433 }
1434 } else if (stack.length == 0) {
1435 int diff_length = compare(prev_locals, locals, types);
1436 if (diff_length == 0) {
1437 return new SameFrame(offset_delta);
1438 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1439 // APPEND
1440 Type[] local_diff = new Type[-diff_length];
1441 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1442 local_diff[j] = locals[i];
1443 }
1444 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1445 offset_delta,
1446 local_diff);
1447 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1448 // CHOP
1449 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1450 offset_delta);
1451 }
1452 }
1453 // FULL_FRAME
1454 return new FullFrame(offset_delta, locals, stack);
1455 }
1456
1457 static boolean isInt(Type t) {
1458 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1459 }
1460
1461 static boolean isSameType(Type t1, Type t2, Types types) {
1462 if (t1 == null) { return t2 == null; }
1463 if (t2 == null) { return false; }
1464
1465 if (isInt(t1) && isInt(t2)) { return true; }
1466
1467 if (t1.hasTag(UNINITIALIZED_THIS)) {
1468 return t2.hasTag(UNINITIALIZED_THIS);
1469 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1470 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1471 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1472 } else {
1473 return false;
1474 }
1475 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1476 return false;
1477 }
1478
1479 return types.isSameType(t1, t2);
1480 }
1481
1482 static int compare(Type[] arr1, Type[] arr2, Types types) {
1483 int diff_length = arr1.length - arr2.length;
1484 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1485 return Integer.MAX_VALUE;
1486 }
1487 int len = (diff_length > 0) ? arr2.length : arr1.length;
1488 for (int i=0; i<len; i++) {
1489 if (!isSameType(arr1[i], arr2[i], types)) {
1490 return Integer.MAX_VALUE;
1491 }
1492 }
1493 return diff_length;
1494 }
1495 }
1496
1497 void writeFields(Scope s) {
1498 // process them in reverse sibling order;
1499 // i.e., process them in declaration order.
1500 List<VarSymbol> vars = List.nil();
1501 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1502 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
1503 }
1504 while (vars.nonEmpty()) {
1505 writeField(vars.head);
1506 vars = vars.tail;
1507 }
1508 }
1509
1510 void writeMethods(Scope s) {
1511 List<MethodSymbol> methods = List.nil();
1512 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1513 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
1514 methods = methods.prepend((MethodSymbol)sym);
1515 }
1516 while (methods.nonEmpty()) {
1517 writeMethod(methods.head);
1518 methods = methods.tail;
1519 }
1520 }
1521
1522 /** Emit a class file for a given class.
1523 * @param c The class from which a class file is generated.
1524 */
1525 public JavaFileObject writeClass(ClassSymbol c)
1526 throws IOException, PoolOverflow, StringOverflow
1527 {
1528 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
1529 Location outLocn;
1530 if (multiModuleMode) {
1531 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
1532 outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
1533 } else {
1534 outLocn = CLASS_OUTPUT;
1535 }
1536 JavaFileObject outFile
1537 = fileManager.getJavaFileForOutput(outLocn,
1538 name,
1539 JavaFileObject.Kind.CLASS,
1540 c.sourcefile);
1541 OutputStream out = outFile.openOutputStream();
1542 try {
1543 writeClassFile(out, c);
1544 if (verbose)
1545 log.printVerbose("wrote.file", outFile.getName());
1546 out.close();
1547 out = null;
1548 } catch (InvalidSignatureException ex) {
1549 log.error(Errors.CannotGenerateClass(c, Fragments.IllegalSignature(c, ex.type())));
1550 } finally {
1551 if (out != null) {
1552 // if we are propagating an exception, delete the file
1553 out.close();
1554 outFile.delete();
1555 outFile = null;
1556 }
1557 }
1558 return outFile; // may be null if write failed
1559 }
1560
1561 /** Write class `c' to outstream `out'.
1562 */
1563 public void writeClassFile(OutputStream out, ClassSymbol c)
1564 throws IOException, PoolOverflow, StringOverflow {
1565 Assert.check((c.flags() & COMPOUND) == 0);
1566 databuf.reset();
1567 poolbuf.reset();
1568
1569 Type supertype = types.supertype(c.type);
1570 List<Type> interfaces = types.interfaces(c.type);
1571 List<Type> typarams = c.type.getTypeArguments();
1572
1573 int flags;
1574 if (c.owner.kind == MDL) {
1575 flags = ACC_MODULE;
1576 } else {
1577 flags = adjustFlags(c.flags() & ~(DEFAULT | STRICTFP));
1578 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1579 flags = flags & AdjustedClassFlags;
1580 }
1581
1582 if (dumpClassModifiers) {
1583 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1584 pw.println();
1585 pw.println("CLASSFILE " + c.getQualifiedName());
1586 pw.println("---" + flagNames(flags));
1587 }
1588 databuf.appendChar(flags);
1589
1590 if (c.owner.kind == MDL) {
1591 PackageSymbol unnamed = ((ModuleSymbol) c.owner).unnamedPackage;
1592 databuf.appendChar(poolWriter.putClass(new ClassSymbol(0, names.module_info, unnamed)));
1593 } else {
1594 databuf.appendChar(poolWriter.putClass(c));
1595 }
1596 databuf.appendChar(supertype.hasTag(CLASS) ? poolWriter.putClass((ClassSymbol)supertype.tsym) : 0);
1597 databuf.appendChar(interfaces.length());
1598 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1599 databuf.appendChar(poolWriter.putClass((ClassSymbol)l.head.tsym));
1600 int fieldsCount = 0;
1601 int methodsCount = 0;
1602 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) {
1603 switch (sym.kind) {
1604 case VAR: fieldsCount++; break;
1605 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1606 break;
1607 case TYP: poolWriter.enterInnerClass((ClassSymbol)sym); break;
1608 default : Assert.error();
1609 }
1610 }
1611
1612 if (c.trans_local != null) {
1613 for (ClassSymbol local : c.trans_local) {
1614 poolWriter.enterInnerClass(local);
1615 }
1616 }
1617
1618 databuf.appendChar(fieldsCount);
1619 writeFields(c.members());
1620 databuf.appendChar(methodsCount);
1621 writeMethods(c.members());
1622
1623 int acountIdx = beginAttrs();
1624 int acount = 0;
1625
1626 boolean sigReq =
1627 typarams.length() != 0 || supertype.allparams().length() != 0;
1628 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1629 sigReq = l.head.allparams().length() != 0;
1630 if (sigReq) {
1631 int alenIdx = writeAttr(names.Signature);
1632 databuf.appendChar(poolWriter.putSignature(c));
1633 endAttr(alenIdx);
1634 acount++;
1635 }
1636
1637 if (c.sourcefile != null && emitSourceFile) {
1638 int alenIdx = writeAttr(names.SourceFile);
1639 // WHM 6/29/1999: Strip file path prefix. We do it here at
1640 // the last possible moment because the sourcefile may be used
1641 // elsewhere in error diagnostics. Fixes 4241573.
1642 String simpleName = PathFileObject.getSimpleName(c.sourcefile);
1643 databuf.appendChar(poolWriter.putName(names.fromString(simpleName)));
1644 endAttr(alenIdx);
1645 acount++;
1646 }
1647
1648 if (genCrt) {
1649 // Append SourceID attribute
1650 int alenIdx = writeAttr(names.SourceID);
1651 databuf.appendChar(poolWriter.putName(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1652 endAttr(alenIdx);
1653 acount++;
1654 // Append CompilationID attribute
1655 alenIdx = writeAttr(names.CompilationID);
1656 databuf.appendChar(poolWriter.putName(names.fromString(Long.toString(System.currentTimeMillis()))));
1657 endAttr(alenIdx);
1658 acount++;
1659 }
1660
1661 acount += writeFlagAttrs(c.flags());
1662 acount += writeJavaAnnotations(c.getRawAttributes());
1663 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false);
1664 acount += writeEnclosingMethodAttribute(c);
1665 if (c.owner.kind == MDL) {
1666 acount += writeModuleAttribute(c);
1667 acount += writeFlagAttrs(c.owner.flags() & ~DEPRECATED);
1668 }
1669 acount += writeExtraClassAttributes(c);
1670 acount += writeExtraAttributes(c);
1671
1672 poolbuf.appendInt(JAVA_MAGIC);
1673 if (preview.isEnabled() && preview.usesPreview(c.sourcefile)) {
1674 poolbuf.appendChar(ClassFile.PREVIEW_MINOR_VERSION);
1675 } else {
1676 poolbuf.appendChar(target.minorVersion);
1677 }
1678 poolbuf.appendChar(target.majorVersion);
1679
1680 if (c.owner.kind != MDL) {
1681 if (target.hasNestmateAccess()) {
1682 acount += writeNestMembersIfNeeded(c);
1683 acount += writeNestHostIfNeeded(c);
1684 }
1685 }
1686
1687 if (c.isRecord()) {
1688 acount += writeRecordAttribute(c);
1689 }
1690
1691 if (target.hasSealedClasses()) {
1692 acount += writePermittedSubclassesIfNeeded(c);
1693 }
1694
1695 if (!poolWriter.bootstrapMethods.isEmpty()) {
1696 writeBootstrapMethods();
1697 acount++;
1698 }
1699
1700 if (!poolWriter.innerClasses.isEmpty()) {
1701 writeInnerClasses();
1702 acount++;
1703 }
1704
1705 if (!poolWriter.preloadClasses.isEmpty()) {
1706 writePreloadAttribute();
1707 acount++;
1708 }
1709
1710 endAttrs(acountIdx, acount);
1711
1712 out.write(poolbuf.elems, 0, poolbuf.length);
1713
1714 poolWriter.writePool(out);
1715 poolWriter.reset(); // to save space
1716
1717 out.write(databuf.elems, 0, databuf.length);
1718 }
1719
1720 /**Allows subclasses to write additional class attributes
1721 *
1722 * @return the number of attributes written
1723 */
1724 protected int writeExtraClassAttributes(ClassSymbol c) {
1725 return 0;
1726 }
1727
1728 /**Allows friends to write additional attributes
1729 *
1730 * @return the number of attributes written
1731 */
1732 protected int writeExtraAttributes(Symbol sym) {
1733 int i = 0;
1734 for (ToIntFunction<Symbol> hook : extraAttributeHooks) {
1735 i += hook.applyAsInt(sym);
1736 }
1737 return i;
1738 }
1739
1740 int adjustFlags(final long flags) {
1741 int result = (int)flags;
1742
1743 // Elide strictfp bit in class files
1744 if (target.obsoleteAccStrict())
1745 result &= ~STRICTFP;
1746
1747 if ((flags & BRIDGE) != 0)
1748 result |= ACC_BRIDGE;
1749 if ((flags & VARARGS) != 0)
1750 result |= ACC_VARARGS;
1751 if ((flags & DEFAULT) != 0)
1752 result &= ~ABSTRACT;
1753 if ((flags & PRIMITIVE_CLASS) != 0)
1754 result |= ACC_PRIMITIVE;
1755 if ((flags & VALUE_CLASS) != 0)
1756 result |= ACC_VALUE;
1757 if ((flags & IDENTITY_TYPE) != 0)
1758 result |= ACC_IDENTITY;
1759 return result;
1760 }
1761
1762 long getLastModified(FileObject filename) {
1763 long mod = 0;
1764 try {
1765 mod = filename.getLastModified();
1766 } catch (SecurityException e) {
1767 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1768 }
1769 return mod;
1770 }
1771 }