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