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