1 /*
2 * Copyright (c) 1999, 2015, 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.net.URI;
30 import java.net.URISyntaxException;
31 import java.nio.CharBuffer;
32 import java.nio.file.Path;
33 import java.util.Arrays;
34 import java.util.EnumSet;
35 import java.util.HashMap;
36 import java.util.HashSet;
37 import java.util.Map;
38 import java.util.Set;
39
40 import javax.tools.JavaFileManager;
41 import javax.tools.JavaFileObject;
42
43 import com.sun.tools.javac.code.*;
44 import com.sun.tools.javac.code.Lint.LintCategory;
45 import com.sun.tools.javac.code.Scope.WriteableScope;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Symtab;
48 import com.sun.tools.javac.code.Type.*;
49 import com.sun.tools.javac.comp.Annotate;
50 import com.sun.tools.javac.file.BaseFileObject;
51 import com.sun.tools.javac.jvm.ClassFile.NameAndType;
52 import com.sun.tools.javac.jvm.ClassFile.Version;
53 import com.sun.tools.javac.util.*;
54 import com.sun.tools.javac.util.DefinedBy.Api;
55 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
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.TypeTag.CLASS;
60 import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
61 import static com.sun.tools.javac.jvm.ClassFile.*;
62 import static com.sun.tools.javac.jvm.ClassFile.Version.*;
63
64 import static com.sun.tools.javac.main.Option.*;
65
66 /** This class provides operations to read a classfile into an internal
67 * representation. The internal representation is anchored in a
68 * ClassSymbol which contains in its scope symbol representations
69 * for all other definitions in the classfile. Top-level Classes themselves
70 * appear as members of the scopes of PackageSymbols.
71 *
72 * <p><b>This is NOT part of any supported API.
73 * If you write code that depends on this, you do so at your own risk.
74 * This code and its internal interfaces are subject to change or
75 * deletion without notice.</b>
76 */
77 public class ClassReader {
78 /** The context key for the class reader. */
79 protected static final Context.Key<ClassReader> classReaderKey = new Context.Key<>();
80
81 public static final int INITIAL_BUFFER_SIZE = 0x0fff0;
82
83 Annotate annotate;
84
85 /** Switch: verbose output.
86 */
87 boolean verbose;
88
89 /** Switch: check class file for correct minor version, unrecognized
90 * attributes.
91 */
92 boolean checkClassFile;
93
94 /** Switch: read constant pool and code sections. This switch is initially
95 * set to false but can be turned on from outside.
96 */
97 public boolean readAllOfClassFile = false;
98
99 /** Switch: allow simplified varargs.
100 */
101 boolean allowSimplifiedVarargs;
102
103 /** Lint option: warn about classfile issues
104 */
105 boolean lintClassfile;
106
107 /** Switch: preserve parameter names from the variable table.
108 */
109 public boolean saveParameterNames;
110
111 /**
112 * The currently selected profile.
113 */
114 public final Profile profile;
115
116 /** The log to use for verbose output
117 */
118 final Log log;
119
120 /** The symbol table. */
121 Symtab syms;
122
123 Types types;
124
125 /** The name table. */
126 final Names names;
127
128 /** Access to files
129 */
130 private final JavaFileManager fileManager;
131
132 /** Factory for diagnostics
133 */
134 JCDiagnostic.Factory diagFactory;
135
136 /** The current scope where type variables are entered.
137 */
138 protected WriteableScope typevars;
139
140 /** The path name of the class file currently being read.
141 */
142 protected JavaFileObject currentClassFile = null;
143
144 /** The class or method currently being read.
145 */
146 protected Symbol currentOwner = null;
147
148 /** The buffer containing the currently read class file.
149 */
150 byte[] buf = new byte[INITIAL_BUFFER_SIZE];
151
152 /** The current input pointer.
153 */
154 protected int bp;
155
156 /** The objects of the constant pool.
157 */
158 Object[] poolObj;
159
160 /** For every constant pool entry, an index into buf where the
161 * defining section of the entry is found.
162 */
163 int[] poolIdx;
164
165 /** The major version number of the class file being read. */
166 int majorVersion;
167 /** The minor version number of the class file being read. */
168 int minorVersion;
169
170 /** A table to hold the constant pool indices for method parameter
171 * names, as given in LocalVariableTable attributes.
172 */
173 int[] parameterNameIndices;
174
175 /**
176 * Whether or not any parameter names have been found.
177 */
178 boolean haveParameterNameIndices;
179
180 /** Set this to false every time we start reading a method
181 * and are saving parameter names. Set it to true when we see
182 * MethodParameters, if it's set when we see a LocalVariableTable,
183 * then we ignore the parameter names from the LVT.
184 */
185 boolean sawMethodParameters;
186
187 /**
188 * The set of attribute names for which warnings have been generated for the current class
189 */
190 Set<Name> warnedAttrs = new HashSet<>();
191
192 /** Get the ClassReader instance for this invocation. */
193 public static ClassReader instance(Context context) {
194 ClassReader instance = context.get(classReaderKey);
195 if (instance == null)
196 instance = new ClassReader(context);
197 return instance;
198 }
199
200 /** Construct a new class reader. */
201 protected ClassReader(Context context) {
202 context.put(classReaderKey, this);
203 names = Names.instance(context);
204 syms = Symtab.instance(context);
205 types = Types.instance(context);
206 fileManager = context.get(JavaFileManager.class);
207 if (fileManager == null)
208 throw new AssertionError("FileManager initialization error");
209 diagFactory = JCDiagnostic.Factory.instance(context);
210
211 log = Log.instance(context);
212
213 Options options = Options.instance(context);
214 annotate = Annotate.instance(context);
215 verbose = options.isSet(VERBOSE);
216 checkClassFile = options.isSet("-checkclassfile");
217
218 Source source = Source.instance(context);
219 allowSimplifiedVarargs = source.allowSimplifiedVarargs();
220
221 saveParameterNames = options.isSet("save-parameter-names");
222
223 profile = Profile.instance(context);
224
225 typevars = WriteableScope.create(syms.noSymbol);
226
227 lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE);
228
229 initAttributeReaders();
230 }
231
232 /** Add member to class unless it is synthetic.
233 */
234 private void enterMember(ClassSymbol c, Symbol sym) {
235 // Synthetic members are not entered -- reason lost to history (optimization?).
236 // Lambda methods must be entered because they may have inner classes (which reference them)
237 if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC || sym.name.startsWith(names.lambda))
238 c.members_field.enter(sym);
239 }
240
241 /************************************************************************
242 * Error Diagnoses
243 ***********************************************************************/
244
245 public ClassFinder.BadClassFile badClassFile(String key, Object... args) {
246 return new ClassFinder.BadClassFile (
247 currentOwner.enclClass(),
248 currentClassFile,
249 diagFactory.fragment(key, args),
250 diagFactory);
251 }
252
253 /************************************************************************
254 * Buffer Access
255 ***********************************************************************/
256
257 /** Read a character.
258 */
259 char nextChar() {
260 return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF));
261 }
262
263 /** Read a byte.
264 */
265 int nextByte() {
266 return buf[bp++] & 0xFF;
267 }
268
269 /** Read an integer.
270 */
271 int nextInt() {
272 return
273 ((buf[bp++] & 0xFF) << 24) +
274 ((buf[bp++] & 0xFF) << 16) +
275 ((buf[bp++] & 0xFF) << 8) +
276 (buf[bp++] & 0xFF);
277 }
278
279 /** Extract a character at position bp from buf.
280 */
281 char getChar(int bp) {
282 return
283 (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF));
284 }
285
286 /** Extract an integer at position bp from buf.
287 */
288 int getInt(int bp) {
289 return
290 ((buf[bp] & 0xFF) << 24) +
291 ((buf[bp+1] & 0xFF) << 16) +
292 ((buf[bp+2] & 0xFF) << 8) +
293 (buf[bp+3] & 0xFF);
294 }
295
296
297 /** Extract a long integer at position bp from buf.
298 */
299 long getLong(int bp) {
300 DataInputStream bufin =
301 new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
302 try {
303 return bufin.readLong();
304 } catch (IOException e) {
305 throw new AssertionError(e);
306 }
307 }
308
309 /** Extract a float at position bp from buf.
310 */
311 float getFloat(int bp) {
312 DataInputStream bufin =
313 new DataInputStream(new ByteArrayInputStream(buf, bp, 4));
314 try {
315 return bufin.readFloat();
316 } catch (IOException e) {
317 throw new AssertionError(e);
318 }
319 }
320
321 /** Extract a double at position bp from buf.
322 */
323 double getDouble(int bp) {
324 DataInputStream bufin =
325 new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
326 try {
327 return bufin.readDouble();
328 } catch (IOException e) {
329 throw new AssertionError(e);
330 }
331 }
332
333 /************************************************************************
334 * Constant Pool Access
335 ***********************************************************************/
336
337 /** Index all constant pool entries, writing their start addresses into
338 * poolIdx.
339 */
340 void indexPool() {
341 poolIdx = new int[nextChar()];
342 poolObj = new Object[poolIdx.length];
343 int i = 1;
344 while (i < poolIdx.length) {
345 poolIdx[i++] = bp;
346 byte tag = buf[bp++];
347 switch (tag) {
348 case CONSTANT_Utf8: case CONSTANT_Unicode: {
349 int len = nextChar();
350 bp = bp + len;
351 break;
352 }
353 case CONSTANT_Class:
354 case CONSTANT_String:
355 case CONSTANT_MethodType:
356 bp = bp + 2;
357 break;
358 case CONSTANT_MethodHandle:
359 bp = bp + 3;
360 break;
361 case CONSTANT_Fieldref:
362 case CONSTANT_Methodref:
363 case CONSTANT_InterfaceMethodref:
364 case CONSTANT_NameandType:
365 case CONSTANT_Integer:
366 case CONSTANT_Float:
367 case CONSTANT_InvokeDynamic:
368 bp = bp + 4;
369 break;
370 case CONSTANT_Long:
371 case CONSTANT_Double:
372 bp = bp + 8;
373 i++;
374 break;
375 default:
376 throw badClassFile("bad.const.pool.tag.at",
377 Byte.toString(tag),
378 Integer.toString(bp -1));
379 }
380 }
381 }
382
383 /** Read constant pool entry at start address i, use pool as a cache.
384 */
385 Object readPool(int i) {
386 Object result = poolObj[i];
387 if (result != null) return result;
388
389 int index = poolIdx[i];
390 if (index == 0) return null;
391
392 byte tag = buf[index];
393 switch (tag) {
394 case CONSTANT_Utf8:
395 poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1));
396 break;
397 case CONSTANT_Unicode:
398 throw badClassFile("unicode.str.not.supported");
399 case CONSTANT_Class:
400 poolObj[i] = readClassOrType(getChar(index + 1));
401 break;
402 case CONSTANT_String:
403 // FIXME: (footprint) do not use toString here
404 poolObj[i] = readName(getChar(index + 1)).toString();
405 break;
406 case CONSTANT_Fieldref: {
407 ClassSymbol owner = readClassSymbol(getChar(index + 1));
408 NameAndType nt = readNameAndType(getChar(index + 3));
409 poolObj[i] = new VarSymbol(0, nt.name, nt.uniqueType.type, owner);
410 break;
411 }
412 case CONSTANT_Methodref:
413 case CONSTANT_InterfaceMethodref: {
414 ClassSymbol owner = readClassSymbol(getChar(index + 1));
415 NameAndType nt = readNameAndType(getChar(index + 3));
416 poolObj[i] = new MethodSymbol(0, nt.name, nt.uniqueType.type, owner);
417 break;
418 }
419 case CONSTANT_NameandType:
420 poolObj[i] = new NameAndType(
421 readName(getChar(index + 1)),
422 readType(getChar(index + 3)), types);
423 break;
424 case CONSTANT_Integer:
425 poolObj[i] = getInt(index + 1);
426 break;
427 case CONSTANT_Float:
428 poolObj[i] = new Float(getFloat(index + 1));
429 break;
430 case CONSTANT_Long:
431 poolObj[i] = new Long(getLong(index + 1));
432 break;
433 case CONSTANT_Double:
434 poolObj[i] = new Double(getDouble(index + 1));
435 break;
436 case CONSTANT_MethodHandle:
437 skipBytes(4);
438 break;
439 case CONSTANT_MethodType:
440 skipBytes(3);
441 break;
442 case CONSTANT_InvokeDynamic:
443 skipBytes(5);
444 break;
445 default:
446 throw badClassFile("bad.const.pool.tag", Byte.toString(tag));
447 }
448 return poolObj[i];
449 }
450
451 /** Read signature and convert to type.
452 */
453 Type readType(int i) {
454 int index = poolIdx[i];
455 return sigToType(buf, index + 3, getChar(index + 1));
456 }
457
458 /** If name is an array type or class signature, return the
459 * corresponding type; otherwise return a ClassSymbol with given name.
460 */
461 Object readClassOrType(int i) {
462 int index = poolIdx[i];
463 int len = getChar(index + 1);
464 int start = index + 3;
465 Assert.check(buf[start] == '[' || buf[start + len - 1] != ';');
466 // by the above assertion, the following test can be
467 // simplified to (buf[start] == '[')
468 return (buf[start] == '[' || buf[start + len - 1] == ';')
469 ? (Object)sigToType(buf, start, len)
470 : (Object)syms.enterClass(names.fromUtf(internalize(buf, start,
471 len)));
472 }
473
474 /** Read signature and convert to type parameters.
475 */
476 List<Type> readTypeParams(int i) {
477 int index = poolIdx[i];
478 return sigToTypeParams(buf, index + 3, getChar(index + 1));
479 }
480
481 /** Read class entry.
482 */
483 ClassSymbol readClassSymbol(int i) {
484 Object obj = readPool(i);
485 if (obj != null && !(obj instanceof ClassSymbol))
486 throw badClassFile("bad.const.pool.entry",
487 currentClassFile.toString(),
488 "CONSTANT_Class_info", i);
489 return (ClassSymbol)obj;
490 }
491
492 /** Read name.
493 */
494 Name readName(int i) {
495 Object obj = readPool(i);
496 if (obj != null && !(obj instanceof Name))
497 throw badClassFile("bad.const.pool.entry",
498 currentClassFile.toString(),
499 "CONSTANT_Utf8_info or CONSTANT_String_info", i);
500 return (Name)obj;
501 }
502
503 /** Read name and type.
504 */
505 NameAndType readNameAndType(int i) {
506 Object obj = readPool(i);
507 if (obj != null && !(obj instanceof NameAndType))
508 throw badClassFile("bad.const.pool.entry",
509 currentClassFile.toString(),
510 "CONSTANT_NameAndType_info", i);
511 return (NameAndType)obj;
512 }
513
514 /************************************************************************
515 * Reading Types
516 ***********************************************************************/
517
518 /** The unread portion of the currently read type is
519 * signature[sigp..siglimit-1].
520 */
521 byte[] signature;
522 int sigp;
523 int siglimit;
524 boolean sigEnterPhase = false;
525
526 /** Convert signature to type, where signature is a byte array segment.
527 */
528 Type sigToType(byte[] sig, int offset, int len) {
529 signature = sig;
530 sigp = offset;
531 siglimit = offset + len;
532 return sigToType();
533 }
534
535 /** Convert signature to type, where signature is implicit.
536 */
537 Type sigToType() {
538 switch ((char) signature[sigp]) {
539 case 'T':
540 sigp++;
541 int start = sigp;
542 while (signature[sigp] != ';') sigp++;
543 sigp++;
544 return sigEnterPhase
545 ? Type.noType
546 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start));
547 case '+': {
548 sigp++;
549 Type t = sigToType();
550 return new WildcardType(t, BoundKind.EXTENDS, syms.boundClass);
551 }
552 case '*':
553 sigp++;
554 return new WildcardType(syms.objectType, BoundKind.UNBOUND,
555 syms.boundClass);
556 case '-': {
557 sigp++;
558 Type t = sigToType();
559 return new WildcardType(t, BoundKind.SUPER, syms.boundClass);
560 }
561 case 'B':
562 sigp++;
563 return syms.byteType;
564 case 'C':
565 sigp++;
566 return syms.charType;
567 case 'D':
568 sigp++;
569 return syms.doubleType;
570 case 'F':
571 sigp++;
572 return syms.floatType;
573 case 'I':
574 sigp++;
575 return syms.intType;
576 case 'J':
577 sigp++;
578 return syms.longType;
579 case 'L':
580 {
581 // int oldsigp = sigp;
582 Type t = classSigToType();
583 if (sigp < siglimit && signature[sigp] == '.')
584 throw badClassFile("deprecated inner class signature syntax " +
585 "(please recompile from source)");
586 /*
587 System.err.println(" decoded " +
588 new String(signature, oldsigp, sigp-oldsigp) +
589 " => " + t + " outer " + t.outer());
590 */
591 return t;
592 }
593 case 'S':
594 sigp++;
595 return syms.shortType;
596 case 'V':
597 sigp++;
598 return syms.voidType;
599 case 'Z':
600 sigp++;
601 return syms.booleanType;
602 case '[':
603 sigp++;
604 return new ArrayType(sigToType(), syms.arrayClass);
605 case '(':
606 sigp++;
607 List<Type> argtypes = sigToTypes(')');
608 Type restype = sigToType();
609 List<Type> thrown = List.nil();
610 while (signature[sigp] == '^') {
611 sigp++;
612 thrown = thrown.prepend(sigToType());
613 }
614 // if there is a typevar in the throws clause we should state it.
615 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) {
616 if (l.head.hasTag(TYPEVAR)) {
617 l.head.tsym.flags_field |= THROWS;
618 }
619 }
620 return new MethodType(argtypes,
621 restype,
622 thrown.reverse(),
623 syms.methodClass);
624 case '<':
625 typevars = typevars.dup(currentOwner);
626 Type poly = new ForAll(sigToTypeParams(), sigToType());
627 typevars = typevars.leave();
628 return poly;
629 default:
630 throw badClassFile("bad.signature",
631 Convert.utf2string(signature, sigp, 10));
632 }
633 }
634
635 byte[] signatureBuffer = new byte[0];
636 int sbp = 0;
637 /** Convert class signature to type, where signature is implicit.
638 */
639 Type classSigToType() {
640 if (signature[sigp] != 'L')
641 throw badClassFile("bad.class.signature",
642 Convert.utf2string(signature, sigp, 10));
643 sigp++;
644 Type outer = Type.noType;
645 int startSbp = sbp;
646
647 while (true) {
648 final byte c = signature[sigp++];
649 switch (c) {
650
651 case ';': { // end
652 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer,
653 startSbp,
654 sbp - startSbp));
655
656 try {
657 return (outer == Type.noType) ?
658 t.erasure(types) :
659 new ClassType(outer, List.<Type>nil(), t);
660 } finally {
661 sbp = startSbp;
662 }
663 }
664
665 case '<': // generic arguments
666 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer,
667 startSbp,
668 sbp - startSbp));
669 outer = new ClassType(outer, sigToTypes('>'), t) {
670 boolean completed = false;
671 @Override @DefinedBy(Api.LANGUAGE_MODEL)
672 public Type getEnclosingType() {
673 if (!completed) {
674 completed = true;
675 tsym.complete();
676 Type enclosingType = tsym.type.getEnclosingType();
677 if (enclosingType != Type.noType) {
678 List<Type> typeArgs =
679 super.getEnclosingType().allparams();
680 List<Type> typeParams =
681 enclosingType.allparams();
682 if (typeParams.length() != typeArgs.length()) {
683 // no "rare" types
684 super.setEnclosingType(types.erasure(enclosingType));
685 } else {
686 super.setEnclosingType(types.subst(enclosingType,
687 typeParams,
688 typeArgs));
689 }
690 } else {
691 super.setEnclosingType(Type.noType);
692 }
693 }
694 return super.getEnclosingType();
695 }
696 @Override
697 public void setEnclosingType(Type outer) {
698 throw new UnsupportedOperationException();
699 }
700 };
701 switch (signature[sigp++]) {
702 case ';':
703 if (sigp < signature.length && signature[sigp] == '.') {
704 // support old-style GJC signatures
705 // The signature produced was
706 // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>;
707 // rather than say
708 // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>;
709 // so we skip past ".Lfoo/Outer$"
710 sigp += (sbp - startSbp) + // "foo/Outer"
711 3; // ".L" and "$"
712 signatureBuffer[sbp++] = (byte)'$';
713 break;
714 } else {
715 sbp = startSbp;
716 return outer;
717 }
718 case '.':
719 signatureBuffer[sbp++] = (byte)'$';
720 break;
721 default:
722 throw new AssertionError(signature[sigp-1]);
723 }
724 continue;
725
726 case '.':
727 //we have seen an enclosing non-generic class
728 if (outer != Type.noType) {
729 t = syms.enterClass(names.fromUtf(signatureBuffer,
730 startSbp,
731 sbp - startSbp));
732 outer = new ClassType(outer, List.<Type>nil(), t);
733 }
734 signatureBuffer[sbp++] = (byte)'$';
735 continue;
736 case '/':
737 signatureBuffer[sbp++] = (byte)'.';
738 continue;
739 default:
740 signatureBuffer[sbp++] = c;
741 continue;
742 }
743 }
744 }
745
746 /** Convert (implicit) signature to list of types
747 * until `terminator' is encountered.
748 */
749 List<Type> sigToTypes(char terminator) {
750 List<Type> head = List.of(null);
751 List<Type> tail = head;
752 while (signature[sigp] != terminator)
753 tail = tail.setTail(List.of(sigToType()));
754 sigp++;
755 return head.tail;
756 }
757
758 /** Convert signature to type parameters, where signature is a byte
759 * array segment.
760 */
761 List<Type> sigToTypeParams(byte[] sig, int offset, int len) {
762 signature = sig;
763 sigp = offset;
764 siglimit = offset + len;
765 return sigToTypeParams();
766 }
767
768 /** Convert signature to type parameters, where signature is implicit.
769 */
770 List<Type> sigToTypeParams() {
771 List<Type> tvars = List.nil();
772 if (signature[sigp] == '<') {
773 sigp++;
774 int start = sigp;
775 sigEnterPhase = true;
776 while (signature[sigp] != '>')
777 tvars = tvars.prepend(sigToTypeParam());
778 sigEnterPhase = false;
779 sigp = start;
780 while (signature[sigp] != '>')
781 sigToTypeParam();
782 sigp++;
783 }
784 return tvars.reverse();
785 }
786
787 /** Convert (implicit) signature to type parameter.
788 */
789 Type sigToTypeParam() {
790 int start = sigp;
791 while (signature[sigp] != ':') sigp++;
792 Name name = names.fromUtf(signature, start, sigp - start);
793 TypeVar tvar;
794 if (sigEnterPhase) {
795 tvar = new TypeVar(name, currentOwner, syms.botType);
796 typevars.enter(tvar.tsym);
797 } else {
798 tvar = (TypeVar)findTypeVar(name);
799 }
800 List<Type> bounds = List.nil();
801 boolean allInterfaces = false;
802 if (signature[sigp] == ':' && signature[sigp+1] == ':') {
803 sigp++;
804 allInterfaces = true;
805 }
806 while (signature[sigp] == ':') {
807 sigp++;
808 bounds = bounds.prepend(sigToType());
809 }
810 if (!sigEnterPhase) {
811 types.setBounds(tvar, bounds.reverse(), allInterfaces);
812 }
813 return tvar;
814 }
815
816 /** Find type variable with given name in `typevars' scope.
817 */
818 Type findTypeVar(Name name) {
819 Symbol s = typevars.findFirst(name);
820 if (s != null) {
821 return s.type;
822 } else {
823 if (readingClassAttr) {
824 // While reading the class attribute, the supertypes
825 // might refer to a type variable from an enclosing element
826 // (method or class).
827 // If the type variable is defined in the enclosing class,
828 // we can actually find it in
829 // currentOwner.owner.type.getTypeArguments()
830 // However, until we have read the enclosing method attribute
831 // we don't know for sure if this owner is correct. It could
832 // be a method and there is no way to tell before reading the
833 // enclosing method attribute.
834 TypeVar t = new TypeVar(name, currentOwner, syms.botType);
835 missingTypeVariables = missingTypeVariables.prepend(t);
836 // System.err.println("Missing type var " + name);
837 return t;
838 }
839 throw badClassFile("undecl.type.var", name);
840 }
841 }
842
843 /************************************************************************
844 * Reading Attributes
845 ***********************************************************************/
846
847 protected enum AttributeKind { CLASS, MEMBER }
848
849 protected abstract class AttributeReader {
850 protected AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) {
851 this.name = name;
852 this.version = version;
853 this.kinds = kinds;
854 }
855
856 protected boolean accepts(AttributeKind kind) {
857 if (kinds.contains(kind)) {
858 if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor))
859 return true;
860
861 if (lintClassfile && !warnedAttrs.contains(name)) {
862 JavaFileObject prev = log.useSource(currentClassFile);
863 try {
864 log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null, "future.attr",
865 name, version.major, version.minor, majorVersion, minorVersion);
866 } finally {
867 log.useSource(prev);
868 }
869 warnedAttrs.add(name);
870 }
871 }
872 return false;
873 }
874
875 protected abstract void read(Symbol sym, int attrLen);
876
877 protected final Name name;
878 protected final ClassFile.Version version;
879 protected final Set<AttributeKind> kinds;
880 }
881
882 protected Set<AttributeKind> CLASS_ATTRIBUTE =
883 EnumSet.of(AttributeKind.CLASS);
884 protected Set<AttributeKind> MEMBER_ATTRIBUTE =
885 EnumSet.of(AttributeKind.MEMBER);
886 protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE =
887 EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER);
888
889 protected Map<Name, AttributeReader> attributeReaders = new HashMap<>();
890
891 private void initAttributeReaders() {
892 AttributeReader[] readers = {
893 // v45.3 attributes
894
895 new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) {
896 protected void read(Symbol sym, int attrLen) {
897 if (readAllOfClassFile || saveParameterNames)
898 ((MethodSymbol)sym).code = readCode(sym);
899 else
900 bp = bp + attrLen;
901 }
902 },
903
904 new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) {
905 protected void read(Symbol sym, int attrLen) {
906 Object v = readPool(nextChar());
907 // Ignore ConstantValue attribute if field not final.
908 if ((sym.flags() & FINAL) != 0)
909 ((VarSymbol) sym).setData(v);
910 }
911 },
912
913 new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
914 protected void read(Symbol sym, int attrLen) {
915 sym.flags_field |= DEPRECATED;
916 }
917 },
918
919 new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
920 protected void read(Symbol sym, int attrLen) {
921 int nexceptions = nextChar();
922 List<Type> thrown = List.nil();
923 for (int j = 0; j < nexceptions; j++)
924 thrown = thrown.prepend(readClassSymbol(nextChar()).type);
925 if (sym.type.getThrownTypes().isEmpty())
926 sym.type.asMethodType().thrown = thrown.reverse();
927 }
928 },
929
930 new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) {
931 protected void read(Symbol sym, int attrLen) {
932 ClassSymbol c = (ClassSymbol) sym;
933 readInnerClasses(c);
934 }
935 },
936
937 new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
938 protected void read(Symbol sym, int attrLen) {
939 int newbp = bp + attrLen;
940 if (saveParameterNames && !sawMethodParameters) {
941 // Pick up parameter names from the variable table.
942 // Parameter names are not explicitly identified as such,
943 // but all parameter name entries in the LocalVariableTable
944 // have a start_pc of 0. Therefore, we record the name
945 // indicies of all slots with a start_pc of zero in the
946 // parameterNameIndicies array.
947 // Note that this implicitly honors the JVMS spec that
948 // there may be more than one LocalVariableTable, and that
949 // there is no specified ordering for the entries.
950 int numEntries = nextChar();
951 for (int i = 0; i < numEntries; i++) {
952 int start_pc = nextChar();
953 int length = nextChar();
954 int nameIndex = nextChar();
955 int sigIndex = nextChar();
956 int register = nextChar();
957 if (start_pc == 0) {
958 // ensure array large enough
959 if (register >= parameterNameIndices.length) {
960 int newSize = Math.max(register, parameterNameIndices.length + 8);
961 parameterNameIndices =
962 Arrays.copyOf(parameterNameIndices, newSize);
963 }
964 parameterNameIndices[register] = nameIndex;
965 haveParameterNameIndices = true;
966 }
967 }
968 }
969 bp = newbp;
970 }
971 },
972
973 new AttributeReader(names.MethodParameters, V52, MEMBER_ATTRIBUTE) {
974 protected void read(Symbol sym, int attrlen) {
975 int newbp = bp + attrlen;
976 if (saveParameterNames) {
977 sawMethodParameters = true;
978 int numEntries = nextByte();
979 parameterNameIndices = new int[numEntries];
980 haveParameterNameIndices = true;
981 for (int i = 0; i < numEntries; i++) {
982 int nameIndex = nextChar();
983 int flags = nextChar();
984 parameterNameIndices[i] = nameIndex;
985 }
986 }
987 bp = newbp;
988 }
989 },
990
991
992 new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) {
993 protected void read(Symbol sym, int attrLen) {
994 ClassSymbol c = (ClassSymbol) sym;
995 Name n = readName(nextChar());
996 c.sourcefile = new SourceFileObject(n, c.flatname);
997 // If the class is a toplevel class, originating from a Java source file,
998 // but the class name does not match the file name, then it is
999 // an auxiliary class.
1000 String sn = n.toString();
1001 if (c.owner.kind == PCK &&
1002 sn.endsWith(".java") &&
1003 !sn.equals(c.name.toString()+".java")) {
1004 c.flags_field |= AUXILIARY;
1005 }
1006 }
1007 },
1008
1009 new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
1010 protected void read(Symbol sym, int attrLen) {
1011 sym.flags_field |= SYNTHETIC;
1012 }
1013 },
1014
1015 // standard v49 attributes
1016
1017 new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) {
1018 protected void read(Symbol sym, int attrLen) {
1019 int newbp = bp + attrLen;
1020 readEnclosingMethodAttr(sym);
1021 bp = newbp;
1022 }
1023 },
1024
1025 new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1026 protected void read(Symbol sym, int attrLen) {
1027 if (sym.kind == TYP) {
1028 ClassSymbol c = (ClassSymbol) sym;
1029 readingClassAttr = true;
1030 try {
1031 ClassType ct1 = (ClassType)c.type;
1032 Assert.check(c == currentOwner);
1033 ct1.typarams_field = readTypeParams(nextChar());
1034 ct1.supertype_field = sigToType();
1035 ListBuffer<Type> is = new ListBuffer<>();
1036 while (sigp != siglimit) is.append(sigToType());
1037 ct1.interfaces_field = is.toList();
1038 } finally {
1039 readingClassAttr = false;
1040 }
1041 } else {
1042 List<Type> thrown = sym.type.getThrownTypes();
1043 sym.type = readType(nextChar());
1044 //- System.err.println(" # " + sym.type);
1045 if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty())
1046 sym.type.asMethodType().thrown = thrown;
1047
1048 }
1049 }
1050 },
1051
1052 // v49 annotation attributes
1053
1054 new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1055 protected void read(Symbol sym, int attrLen) {
1056 attachAnnotationDefault(sym);
1057 }
1058 },
1059
1060 new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1061 protected void read(Symbol sym, int attrLen) {
1062 attachAnnotations(sym);
1063 }
1064 },
1065
1066 new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1067 protected void read(Symbol sym, int attrLen) {
1068 attachParameterAnnotations(sym);
1069 }
1070 },
1071
1072 new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1073 protected void read(Symbol sym, int attrLen) {
1074 attachAnnotations(sym);
1075 }
1076 },
1077
1078 new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1079 protected void read(Symbol sym, int attrLen) {
1080 attachParameterAnnotations(sym);
1081 }
1082 },
1083
1084 // additional "legacy" v49 attributes, superceded by flags
1085
1086 new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1087 protected void read(Symbol sym, int attrLen) {
1088 sym.flags_field |= ANNOTATION;
1089 }
1090 },
1091
1092 new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) {
1093 protected void read(Symbol sym, int attrLen) {
1094 sym.flags_field |= BRIDGE;
1095 }
1096 },
1097
1098 new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1099 protected void read(Symbol sym, int attrLen) {
1100 sym.flags_field |= ENUM;
1101 }
1102 },
1103
1104 new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1105 protected void read(Symbol sym, int attrLen) {
1106 sym.flags_field |= VARARGS;
1107 }
1108 },
1109
1110 new AttributeReader(names.RuntimeVisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) {
1111 protected void read(Symbol sym, int attrLen) {
1112 attachTypeAnnotations(sym);
1113 }
1114 },
1115
1116 new AttributeReader(names.RuntimeInvisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) {
1117 protected void read(Symbol sym, int attrLen) {
1118 attachTypeAnnotations(sym);
1119 }
1120 },
1121
1122
1123 // The following attributes for a Code attribute are not currently handled
1124 // StackMapTable
1125 // SourceDebugExtension
1126 // LineNumberTable
1127 // LocalVariableTypeTable
1128 };
1129
1130 for (AttributeReader r: readers)
1131 attributeReaders.put(r.name, r);
1132 }
1133
1134 /** Report unrecognized attribute.
1135 */
1136 void unrecognized(Name attrName) {
1137 if (checkClassFile)
1138 printCCF("ccf.unrecognized.attribute", attrName);
1139 }
1140
1141
1142
1143 protected void readEnclosingMethodAttr(Symbol sym) {
1144 // sym is a nested class with an "Enclosing Method" attribute
1145 // remove sym from it's current owners scope and place it in
1146 // the scope specified by the attribute
1147 sym.owner.members().remove(sym);
1148 ClassSymbol self = (ClassSymbol)sym;
1149 ClassSymbol c = readClassSymbol(nextChar());
1150 NameAndType nt = readNameAndType(nextChar());
1151
1152 if (c.members_field == null)
1153 throw badClassFile("bad.enclosing.class", self, c);
1154
1155 MethodSymbol m = findMethod(nt, c.members_field, self.flags());
1156 if (nt != null && m == null)
1157 throw badClassFile("bad.enclosing.method", self);
1158
1159 self.name = simpleBinaryName(self.flatname, c.flatname) ;
1160 self.owner = m != null ? m : c;
1161 if (self.name.isEmpty())
1162 self.fullname = names.empty;
1163 else
1164 self.fullname = ClassSymbol.formFullName(self.name, self.owner);
1165
1166 if (m != null) {
1167 ((ClassType)sym.type).setEnclosingType(m.type);
1168 } else if ((self.flags_field & STATIC) == 0) {
1169 ((ClassType)sym.type).setEnclosingType(c.type);
1170 } else {
1171 ((ClassType)sym.type).setEnclosingType(Type.noType);
1172 }
1173 enterTypevars(self);
1174 if (!missingTypeVariables.isEmpty()) {
1175 ListBuffer<Type> typeVars = new ListBuffer<>();
1176 for (Type typevar : missingTypeVariables) {
1177 typeVars.append(findTypeVar(typevar.tsym.name));
1178 }
1179 foundTypeVariables = typeVars.toList();
1180 } else {
1181 foundTypeVariables = List.nil();
1182 }
1183 }
1184
1185 // See java.lang.Class
1186 private Name simpleBinaryName(Name self, Name enclosing) {
1187 String simpleBinaryName = self.toString().substring(enclosing.toString().length());
1188 if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$')
1189 throw badClassFile("bad.enclosing.method", self);
1190 int index = 1;
1191 while (index < simpleBinaryName.length() &&
1192 isAsciiDigit(simpleBinaryName.charAt(index)))
1193 index++;
1194 return names.fromString(simpleBinaryName.substring(index));
1195 }
1196
1197 private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) {
1198 if (nt == null)
1199 return null;
1200
1201 MethodType type = nt.uniqueType.type.asMethodType();
1202
1203 for (Symbol sym : scope.getSymbolsByName(nt.name)) {
1204 if (sym.kind == MTH && isSameBinaryType(sym.type.asMethodType(), type))
1205 return (MethodSymbol)sym;
1206 }
1207
1208 if (nt.name != names.init)
1209 // not a constructor
1210 return null;
1211 if ((flags & INTERFACE) != 0)
1212 // no enclosing instance
1213 return null;
1214 if (nt.uniqueType.type.getParameterTypes().isEmpty())
1215 // no parameters
1216 return null;
1217
1218 // A constructor of an inner class.
1219 // Remove the first argument (the enclosing instance)
1220 nt.setType(new MethodType(nt.uniqueType.type.getParameterTypes().tail,
1221 nt.uniqueType.type.getReturnType(),
1222 nt.uniqueType.type.getThrownTypes(),
1223 syms.methodClass));
1224 // Try searching again
1225 return findMethod(nt, scope, flags);
1226 }
1227
1228 /** Similar to Types.isSameType but avoids completion */
1229 private boolean isSameBinaryType(MethodType mt1, MethodType mt2) {
1230 List<Type> types1 = types.erasure(mt1.getParameterTypes())
1231 .prepend(types.erasure(mt1.getReturnType()));
1232 List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType());
1233 while (!types1.isEmpty() && !types2.isEmpty()) {
1234 if (types1.head.tsym != types2.head.tsym)
1235 return false;
1236 types1 = types1.tail;
1237 types2 = types2.tail;
1238 }
1239 return types1.isEmpty() && types2.isEmpty();
1240 }
1241
1242 /**
1243 * Character.isDigit answers <tt>true</tt> to some non-ascii
1244 * digits. This one does not. <b>copied from java.lang.Class</b>
1245 */
1246 private static boolean isAsciiDigit(char c) {
1247 return '0' <= c && c <= '9';
1248 }
1249
1250 /** Read member attributes.
1251 */
1252 void readMemberAttrs(Symbol sym) {
1253 readAttrs(sym, AttributeKind.MEMBER);
1254 }
1255
1256 void readAttrs(Symbol sym, AttributeKind kind) {
1257 char ac = nextChar();
1258 for (int i = 0; i < ac; i++) {
1259 Name attrName = readName(nextChar());
1260 int attrLen = nextInt();
1261 AttributeReader r = attributeReaders.get(attrName);
1262 if (r != null && r.accepts(kind))
1263 r.read(sym, attrLen);
1264 else {
1265 unrecognized(attrName);
1266 bp = bp + attrLen;
1267 }
1268 }
1269 }
1270
1271 private boolean readingClassAttr = false;
1272 private List<Type> missingTypeVariables = List.nil();
1273 private List<Type> foundTypeVariables = List.nil();
1274
1275 /** Read class attributes.
1276 */
1277 void readClassAttrs(ClassSymbol c) {
1278 readAttrs(c, AttributeKind.CLASS);
1279 }
1280
1281 /** Read code block.
1282 */
1283 Code readCode(Symbol owner) {
1284 nextChar(); // max_stack
1285 nextChar(); // max_locals
1286 final int code_length = nextInt();
1287 bp += code_length;
1288 final char exception_table_length = nextChar();
1289 bp += exception_table_length * 8;
1290 readMemberAttrs(owner);
1291 return null;
1292 }
1293
1294 /************************************************************************
1295 * Reading Java-language annotations
1296 ***********************************************************************/
1297
1298 /** Attach annotations.
1299 */
1300 void attachAnnotations(final Symbol sym) {
1301 int numAttributes = nextChar();
1302 if (numAttributes != 0) {
1303 ListBuffer<CompoundAnnotationProxy> proxies = new ListBuffer<>();
1304 for (int i = 0; i<numAttributes; i++) {
1305 CompoundAnnotationProxy proxy = readCompoundAnnotation();
1306 proxies.append(proxy);
1307 }
1308 annotate.normal(new AnnotationCompleter(sym, proxies.toList()));
1309 }
1310 }
1311
1312 /** Attach parameter annotations.
1313 */
1314 void attachParameterAnnotations(final Symbol method) {
1315 final MethodSymbol meth = (MethodSymbol)method;
1316 int numParameters = buf[bp++] & 0xFF;
1317 List<VarSymbol> parameters = meth.params();
1318 int pnum = 0;
1319 while (parameters.tail != null) {
1320 attachAnnotations(parameters.head);
1321 parameters = parameters.tail;
1322 pnum++;
1323 }
1324 if (pnum != numParameters) {
1325 throw badClassFile("bad.runtime.invisible.param.annotations", meth);
1326 }
1327 }
1328
1329 void attachTypeAnnotations(final Symbol sym) {
1330 int numAttributes = nextChar();
1331 if (numAttributes != 0) {
1332 ListBuffer<TypeAnnotationProxy> proxies = new ListBuffer<>();
1333 for (int i = 0; i < numAttributes; i++)
1334 proxies.append(readTypeAnnotation());
1335 annotate.normal(new TypeAnnotationCompleter(sym, proxies.toList()));
1336 }
1337 }
1338
1339 /** Attach the default value for an annotation element.
1340 */
1341 void attachAnnotationDefault(final Symbol sym) {
1342 final MethodSymbol meth = (MethodSymbol)sym; // only on methods
1343 final Attribute value = readAttributeValue();
1344
1345 // The default value is set later during annotation. It might
1346 // be the case that the Symbol sym is annotated _after_ the
1347 // repeating instances that depend on this default value,
1348 // because of this we set an interim value that tells us this
1349 // element (most likely) has a default.
1350 //
1351 // Set interim value for now, reset just before we do this
1352 // properly at annotate time.
1353 meth.defaultValue = value;
1354 annotate.normal(new AnnotationDefaultCompleter(meth, value));
1355 }
1356
1357 Type readTypeOrClassSymbol(int i) {
1358 // support preliminary jsr175-format class files
1359 if (buf[poolIdx[i]] == CONSTANT_Class)
1360 return readClassSymbol(i).type;
1361 return readType(i);
1362 }
1363 Type readEnumType(int i) {
1364 // support preliminary jsr175-format class files
1365 int index = poolIdx[i];
1366 int length = getChar(index + 1);
1367 if (buf[index + length + 2] != ';')
1368 return syms.enterClass(readName(i)).type;
1369 return readType(i);
1370 }
1371
1372 CompoundAnnotationProxy readCompoundAnnotation() {
1373 Type t = readTypeOrClassSymbol(nextChar());
1374 int numFields = nextChar();
1375 ListBuffer<Pair<Name,Attribute>> pairs = new ListBuffer<>();
1376 for (int i=0; i<numFields; i++) {
1377 Name name = readName(nextChar());
1378 Attribute value = readAttributeValue();
1379 pairs.append(new Pair<>(name, value));
1380 }
1381 return new CompoundAnnotationProxy(t, pairs.toList());
1382 }
1383
1384 TypeAnnotationProxy readTypeAnnotation() {
1385 TypeAnnotationPosition position = readPosition();
1386 CompoundAnnotationProxy proxy = readCompoundAnnotation();
1387
1388 return new TypeAnnotationProxy(proxy, position);
1389 }
1390
1391 TypeAnnotationPosition readPosition() {
1392 int tag = nextByte(); // TargetType tag is a byte
1393
1394 if (!TargetType.isValidTargetTypeValue(tag))
1395 throw badClassFile("bad.type.annotation.value", String.format("0x%02X", tag));
1396
1397 TargetType type = TargetType.fromTargetTypeValue(tag);
1398
1399 switch (type) {
1400 // instanceof
1401 case INSTANCEOF: {
1402 final int offset = nextChar();
1403 final TypeAnnotationPosition position =
1404 TypeAnnotationPosition.instanceOf(readTypePath());
1405 position.offset = offset;
1406 return position;
1407 }
1408 // new expression
1409 case NEW: {
1410 final int offset = nextChar();
1411 final TypeAnnotationPosition position =
1412 TypeAnnotationPosition.newObj(readTypePath());
1413 position.offset = offset;
1414 return position;
1415 }
1416 // constructor/method reference receiver
1417 case CONSTRUCTOR_REFERENCE: {
1418 final int offset = nextChar();
1419 final TypeAnnotationPosition position =
1420 TypeAnnotationPosition.constructorRef(readTypePath());
1421 position.offset = offset;
1422 return position;
1423 }
1424 case METHOD_REFERENCE: {
1425 final int offset = nextChar();
1426 final TypeAnnotationPosition position =
1427 TypeAnnotationPosition.methodRef(readTypePath());
1428 position.offset = offset;
1429 return position;
1430 }
1431 // local variable
1432 case LOCAL_VARIABLE: {
1433 final int table_length = nextChar();
1434 final int[] newLvarOffset = new int[table_length];
1435 final int[] newLvarLength = new int[table_length];
1436 final int[] newLvarIndex = new int[table_length];
1437
1438 for (int i = 0; i < table_length; ++i) {
1439 newLvarOffset[i] = nextChar();
1440 newLvarLength[i] = nextChar();
1441 newLvarIndex[i] = nextChar();
1442 }
1443
1444 final TypeAnnotationPosition position =
1445 TypeAnnotationPosition.localVariable(readTypePath());
1446 position.lvarOffset = newLvarOffset;
1447 position.lvarLength = newLvarLength;
1448 position.lvarIndex = newLvarIndex;
1449 return position;
1450 }
1451 // resource variable
1452 case RESOURCE_VARIABLE: {
1453 final int table_length = nextChar();
1454 final int[] newLvarOffset = new int[table_length];
1455 final int[] newLvarLength = new int[table_length];
1456 final int[] newLvarIndex = new int[table_length];
1457
1458 for (int i = 0; i < table_length; ++i) {
1459 newLvarOffset[i] = nextChar();
1460 newLvarLength[i] = nextChar();
1461 newLvarIndex[i] = nextChar();
1462 }
1463
1464 final TypeAnnotationPosition position =
1465 TypeAnnotationPosition.resourceVariable(readTypePath());
1466 position.lvarOffset = newLvarOffset;
1467 position.lvarLength = newLvarLength;
1468 position.lvarIndex = newLvarIndex;
1469 return position;
1470 }
1471 // exception parameter
1472 case EXCEPTION_PARAMETER: {
1473 final int exception_index = nextChar();
1474 final TypeAnnotationPosition position =
1475 TypeAnnotationPosition.exceptionParameter(readTypePath());
1476 position.setExceptionIndex(exception_index);
1477 return position;
1478 }
1479 // method receiver
1480 case METHOD_RECEIVER:
1481 return TypeAnnotationPosition.methodReceiver(readTypePath());
1482 // type parameter
1483 case CLASS_TYPE_PARAMETER: {
1484 final int parameter_index = nextByte();
1485 return TypeAnnotationPosition
1486 .typeParameter(readTypePath(), parameter_index);
1487 }
1488 case METHOD_TYPE_PARAMETER: {
1489 final int parameter_index = nextByte();
1490 return TypeAnnotationPosition
1491 .methodTypeParameter(readTypePath(), parameter_index);
1492 }
1493 // type parameter bound
1494 case CLASS_TYPE_PARAMETER_BOUND: {
1495 final int parameter_index = nextByte();
1496 final int bound_index = nextByte();
1497 return TypeAnnotationPosition
1498 .typeParameterBound(readTypePath(), parameter_index,
1499 bound_index);
1500 }
1501 case METHOD_TYPE_PARAMETER_BOUND: {
1502 final int parameter_index = nextByte();
1503 final int bound_index = nextByte();
1504 return TypeAnnotationPosition
1505 .methodTypeParameterBound(readTypePath(), parameter_index,
1506 bound_index);
1507 }
1508 // class extends or implements clause
1509 case CLASS_EXTENDS: {
1510 final int type_index = nextChar();
1511 return TypeAnnotationPosition.classExtends(readTypePath(),
1512 type_index);
1513 }
1514 // throws
1515 case THROWS: {
1516 final int type_index = nextChar();
1517 return TypeAnnotationPosition.methodThrows(readTypePath(),
1518 type_index);
1519 }
1520 // method parameter
1521 case METHOD_FORMAL_PARAMETER: {
1522 final int parameter_index = nextByte();
1523 return TypeAnnotationPosition.methodParameter(readTypePath(),
1524 parameter_index);
1525 }
1526 // type cast
1527 case CAST: {
1528 final int offset = nextChar();
1529 final int type_index = nextByte();
1530 final TypeAnnotationPosition position =
1531 TypeAnnotationPosition.typeCast(readTypePath(), type_index);
1532 position.offset = offset;
1533 return position;
1534 }
1535 // method/constructor/reference type argument
1536 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: {
1537 final int offset = nextChar();
1538 final int type_index = nextByte();
1539 final TypeAnnotationPosition position = TypeAnnotationPosition
1540 .constructorInvocationTypeArg(readTypePath(), type_index);
1541 position.offset = offset;
1542 return position;
1543 }
1544 case METHOD_INVOCATION_TYPE_ARGUMENT: {
1545 final int offset = nextChar();
1546 final int type_index = nextByte();
1547 final TypeAnnotationPosition position = TypeAnnotationPosition
1548 .methodInvocationTypeArg(readTypePath(), type_index);
1549 position.offset = offset;
1550 return position;
1551 }
1552 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: {
1553 final int offset = nextChar();
1554 final int type_index = nextByte();
1555 final TypeAnnotationPosition position = TypeAnnotationPosition
1556 .constructorRefTypeArg(readTypePath(), type_index);
1557 position.offset = offset;
1558 return position;
1559 }
1560 case METHOD_REFERENCE_TYPE_ARGUMENT: {
1561 final int offset = nextChar();
1562 final int type_index = nextByte();
1563 final TypeAnnotationPosition position = TypeAnnotationPosition
1564 .methodRefTypeArg(readTypePath(), type_index);
1565 position.offset = offset;
1566 return position;
1567 }
1568 // We don't need to worry about these
1569 case METHOD_RETURN:
1570 return TypeAnnotationPosition.methodReturn(readTypePath());
1571 case FIELD:
1572 return TypeAnnotationPosition.field(readTypePath());
1573 case UNKNOWN:
1574 throw new AssertionError("jvm.ClassReader: UNKNOWN target type should never occur!");
1575 default:
1576 throw new AssertionError("jvm.ClassReader: Unknown target type for position: " + type);
1577 }
1578 }
1579
1580 List<TypeAnnotationPosition.TypePathEntry> readTypePath() {
1581 int len = nextByte();
1582 ListBuffer<Integer> loc = new ListBuffer<>();
1583 for (int i = 0; i < len * TypeAnnotationPosition.TypePathEntry.bytesPerEntry; ++i)
1584 loc = loc.append(nextByte());
1585
1586 return TypeAnnotationPosition.getTypePathFromBinary(loc.toList());
1587
1588 }
1589
1590 Attribute readAttributeValue() {
1591 char c = (char) buf[bp++];
1592 switch (c) {
1593 case 'B':
1594 return new Attribute.Constant(syms.byteType, readPool(nextChar()));
1595 case 'C':
1596 return new Attribute.Constant(syms.charType, readPool(nextChar()));
1597 case 'D':
1598 return new Attribute.Constant(syms.doubleType, readPool(nextChar()));
1599 case 'F':
1600 return new Attribute.Constant(syms.floatType, readPool(nextChar()));
1601 case 'I':
1602 return new Attribute.Constant(syms.intType, readPool(nextChar()));
1603 case 'J':
1604 return new Attribute.Constant(syms.longType, readPool(nextChar()));
1605 case 'S':
1606 return new Attribute.Constant(syms.shortType, readPool(nextChar()));
1607 case 'Z':
1608 return new Attribute.Constant(syms.booleanType, readPool(nextChar()));
1609 case 's':
1610 return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString());
1611 case 'e':
1612 return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar()));
1613 case 'c':
1614 return new Attribute.Class(types, readTypeOrClassSymbol(nextChar()));
1615 case '[': {
1616 int n = nextChar();
1617 ListBuffer<Attribute> l = new ListBuffer<>();
1618 for (int i=0; i<n; i++)
1619 l.append(readAttributeValue());
1620 return new ArrayAttributeProxy(l.toList());
1621 }
1622 case '@':
1623 return readCompoundAnnotation();
1624 default:
1625 throw new AssertionError("unknown annotation tag '" + c + "'");
1626 }
1627 }
1628
1629 interface ProxyVisitor extends Attribute.Visitor {
1630 void visitEnumAttributeProxy(EnumAttributeProxy proxy);
1631 void visitArrayAttributeProxy(ArrayAttributeProxy proxy);
1632 void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy);
1633 }
1634
1635 static class EnumAttributeProxy extends Attribute {
1636 Type enumType;
1637 Name enumerator;
1638 public EnumAttributeProxy(Type enumType, Name enumerator) {
1639 super(null);
1640 this.enumType = enumType;
1641 this.enumerator = enumerator;
1642 }
1643 public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); }
1644 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1645 public String toString() {
1646 return "/*proxy enum*/" + enumType + "." + enumerator;
1647 }
1648 }
1649
1650 static class ArrayAttributeProxy extends Attribute {
1651 List<Attribute> values;
1652 ArrayAttributeProxy(List<Attribute> values) {
1653 super(null);
1654 this.values = values;
1655 }
1656 public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); }
1657 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1658 public String toString() {
1659 return "{" + values + "}";
1660 }
1661 }
1662
1663 /** A temporary proxy representing a compound attribute.
1664 */
1665 static class CompoundAnnotationProxy extends Attribute {
1666 final List<Pair<Name,Attribute>> values;
1667 public CompoundAnnotationProxy(Type type,
1668 List<Pair<Name,Attribute>> values) {
1669 super(type);
1670 this.values = values;
1671 }
1672 public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); }
1673 @Override @DefinedBy(Api.LANGUAGE_MODEL)
1674 public String toString() {
1675 StringBuilder buf = new StringBuilder();
1676 buf.append("@");
1677 buf.append(type.tsym.getQualifiedName());
1678 buf.append("/*proxy*/{");
1679 boolean first = true;
1680 for (List<Pair<Name,Attribute>> v = values;
1681 v.nonEmpty(); v = v.tail) {
1682 Pair<Name,Attribute> value = v.head;
1683 if (!first) buf.append(",");
1684 first = false;
1685 buf.append(value.fst);
1686 buf.append("=");
1687 buf.append(value.snd);
1688 }
1689 buf.append("}");
1690 return buf.toString();
1691 }
1692 }
1693
1694 /** A temporary proxy representing a type annotation.
1695 */
1696 static class TypeAnnotationProxy {
1697 final CompoundAnnotationProxy compound;
1698 final TypeAnnotationPosition position;
1699 public TypeAnnotationProxy(CompoundAnnotationProxy compound,
1700 TypeAnnotationPosition position) {
1701 this.compound = compound;
1702 this.position = position;
1703 }
1704 }
1705
1706 class AnnotationDeproxy implements ProxyVisitor {
1707 private ClassSymbol requestingOwner = currentOwner.kind == MTH
1708 ? currentOwner.enclClass() : (ClassSymbol)currentOwner;
1709
1710 List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) {
1711 // also must fill in types!!!!
1712 ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
1713 for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) {
1714 buf.append(deproxyCompound(l.head));
1715 }
1716 return buf.toList();
1717 }
1718
1719 Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) {
1720 ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf = new ListBuffer<>();
1721 for (List<Pair<Name,Attribute>> l = a.values;
1722 l.nonEmpty();
1723 l = l.tail) {
1724 MethodSymbol meth = findAccessMethod(a.type, l.head.fst);
1725 buf.append(new Pair<>(meth, deproxy(meth.type.getReturnType(), l.head.snd)));
1726 }
1727 return new Attribute.Compound(a.type, buf.toList());
1728 }
1729
1730 MethodSymbol findAccessMethod(Type container, Name name) {
1731 CompletionFailure failure = null;
1732 try {
1733 for (Symbol sym : container.tsym.members().getSymbolsByName(name)) {
1734 if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0)
1735 return (MethodSymbol) sym;
1736 }
1737 } catch (CompletionFailure ex) {
1738 failure = ex;
1739 }
1740 // The method wasn't found: emit a warning and recover
1741 JavaFileObject prevSource = log.useSource(requestingOwner.classfile);
1742 try {
1743 if (lintClassfile) {
1744 if (failure == null) {
1745 log.warning("annotation.method.not.found",
1746 container,
1747 name);
1748 } else {
1749 log.warning("annotation.method.not.found.reason",
1750 container,
1751 name,
1752 failure.getDetailValue());//diagnostic, if present
1753 }
1754 }
1755 } finally {
1756 log.useSource(prevSource);
1757 }
1758 // Construct a new method type and symbol. Use bottom
1759 // type (typeof null) as return type because this type is
1760 // a subtype of all reference types and can be converted
1761 // to primitive types by unboxing.
1762 MethodType mt = new MethodType(List.<Type>nil(),
1763 syms.botType,
1764 List.<Type>nil(),
1765 syms.methodClass);
1766 return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym);
1767 }
1768
1769 Attribute result;
1770 Type type;
1771 Attribute deproxy(Type t, Attribute a) {
1772 Type oldType = type;
1773 try {
1774 type = t;
1775 a.accept(this);
1776 return result;
1777 } finally {
1778 type = oldType;
1779 }
1780 }
1781
1782 // implement Attribute.Visitor below
1783
1784 public void visitConstant(Attribute.Constant value) {
1785 // assert value.type == type;
1786 result = value;
1787 }
1788
1789 public void visitClass(Attribute.Class clazz) {
1790 result = clazz;
1791 }
1792
1793 public void visitEnum(Attribute.Enum e) {
1794 throw new AssertionError(); // shouldn't happen
1795 }
1796
1797 public void visitCompound(Attribute.Compound compound) {
1798 throw new AssertionError(); // shouldn't happen
1799 }
1800
1801 public void visitArray(Attribute.Array array) {
1802 throw new AssertionError(); // shouldn't happen
1803 }
1804
1805 public void visitError(Attribute.Error e) {
1806 throw new AssertionError(); // shouldn't happen
1807 }
1808
1809 public void visitEnumAttributeProxy(EnumAttributeProxy proxy) {
1810 // type.tsym.flatName() should == proxy.enumFlatName
1811 TypeSymbol enumTypeSym = proxy.enumType.tsym;
1812 VarSymbol enumerator = null;
1813 CompletionFailure failure = null;
1814 try {
1815 for (Symbol sym : enumTypeSym.members().getSymbolsByName(proxy.enumerator)) {
1816 if (sym.kind == VAR) {
1817 enumerator = (VarSymbol)sym;
1818 break;
1819 }
1820 }
1821 }
1822 catch (CompletionFailure ex) {
1823 failure = ex;
1824 }
1825 if (enumerator == null) {
1826 if (failure != null) {
1827 log.warning("unknown.enum.constant.reason",
1828 currentClassFile, enumTypeSym, proxy.enumerator,
1829 failure.getDiagnostic());
1830 } else {
1831 log.warning("unknown.enum.constant",
1832 currentClassFile, enumTypeSym, proxy.enumerator);
1833 }
1834 result = new Attribute.Enum(enumTypeSym.type,
1835 new VarSymbol(0, proxy.enumerator, syms.botType, enumTypeSym));
1836 } else {
1837 result = new Attribute.Enum(enumTypeSym.type, enumerator);
1838 }
1839 }
1840
1841 public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) {
1842 int length = proxy.values.length();
1843 Attribute[] ats = new Attribute[length];
1844 Type elemtype = types.elemtype(type);
1845 int i = 0;
1846 for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) {
1847 ats[i++] = deproxy(elemtype, p.head);
1848 }
1849 result = new Attribute.Array(type, ats);
1850 }
1851
1852 public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) {
1853 result = deproxyCompound(proxy);
1854 }
1855 }
1856
1857 class AnnotationDefaultCompleter extends AnnotationDeproxy implements Annotate.Worker {
1858 final MethodSymbol sym;
1859 final Attribute value;
1860 final JavaFileObject classFile = currentClassFile;
1861 @Override
1862 public String toString() {
1863 return " ClassReader store default for " + sym.owner + "." + sym + " is " + value;
1864 }
1865 AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) {
1866 this.sym = sym;
1867 this.value = value;
1868 }
1869 // implement Annotate.Worker.run()
1870 public void run() {
1871 JavaFileObject previousClassFile = currentClassFile;
1872 try {
1873 // Reset the interim value set earlier in
1874 // attachAnnotationDefault().
1875 sym.defaultValue = null;
1876 currentClassFile = classFile;
1877 sym.defaultValue = deproxy(sym.type.getReturnType(), value);
1878 } finally {
1879 currentClassFile = previousClassFile;
1880 }
1881 }
1882 }
1883
1884 class AnnotationCompleter extends AnnotationDeproxy implements Annotate.Worker {
1885 final Symbol sym;
1886 final List<CompoundAnnotationProxy> l;
1887 final JavaFileObject classFile;
1888 @Override
1889 public String toString() {
1890 return " ClassReader annotate " + sym.owner + "." + sym + " with " + l;
1891 }
1892 AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) {
1893 this.sym = sym;
1894 this.l = l;
1895 this.classFile = currentClassFile;
1896 }
1897 // implement Annotate.Worker.run()
1898 public void run() {
1899 JavaFileObject previousClassFile = currentClassFile;
1900 try {
1901 currentClassFile = classFile;
1902 List<Attribute.Compound> newList = deproxyCompoundList(l);
1903 if (sym.annotationsPendingCompletion()) {
1904 sym.setDeclarationAttributes(newList);
1905 } else {
1906 sym.appendAttributes(newList);
1907 }
1908 } finally {
1909 currentClassFile = previousClassFile;
1910 }
1911 }
1912 }
1913
1914 class TypeAnnotationCompleter extends AnnotationCompleter {
1915
1916 List<TypeAnnotationProxy> proxies;
1917
1918 TypeAnnotationCompleter(Symbol sym,
1919 List<TypeAnnotationProxy> proxies) {
1920 super(sym, List.<CompoundAnnotationProxy>nil());
1921 this.proxies = proxies;
1922 }
1923
1924 List<Attribute.TypeCompound> deproxyTypeCompoundList(List<TypeAnnotationProxy> proxies) {
1925 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
1926 for (TypeAnnotationProxy proxy: proxies) {
1927 Attribute.Compound compound = deproxyCompound(proxy.compound);
1928 Attribute.TypeCompound typeCompound = new Attribute.TypeCompound(compound, proxy.position);
1929 buf.add(typeCompound);
1930 }
1931 return buf.toList();
1932 }
1933
1934 @Override
1935 public void run() {
1936 JavaFileObject previousClassFile = currentClassFile;
1937 try {
1938 currentClassFile = classFile;
1939 List<Attribute.TypeCompound> newList = deproxyTypeCompoundList(proxies);
1940 sym.setTypeAttributes(newList.prependList(sym.getRawTypeAttributes()));
1941 } finally {
1942 currentClassFile = previousClassFile;
1943 }
1944 }
1945 }
1946
1947
1948 /************************************************************************
1949 * Reading Symbols
1950 ***********************************************************************/
1951
1952 /** Read a field.
1953 */
1954 VarSymbol readField() {
1955 long flags = adjustFieldFlags(nextChar());
1956 Name name = readName(nextChar());
1957 Type type = readType(nextChar());
1958 VarSymbol v = new VarSymbol(flags, name, type, currentOwner);
1959 readMemberAttrs(v);
1960 return v;
1961 }
1962
1963 /** Read a method.
1964 */
1965 MethodSymbol readMethod() {
1966 long flags = adjustMethodFlags(nextChar());
1967 Name name = readName(nextChar());
1968 Type type = readType(nextChar());
1969 if (currentOwner.isInterface() &&
1970 (flags & ABSTRACT) == 0 && !name.equals(names.clinit)) {
1971 if (majorVersion > Version.V52.major ||
1972 (majorVersion == Version.V52.major && minorVersion >= Version.V52.minor)) {
1973 if ((flags & STATIC) == 0) {
1974 currentOwner.flags_field |= DEFAULT;
1975 flags |= DEFAULT | ABSTRACT;
1976 }
1977 } else {
1978 //protect against ill-formed classfiles
1979 throw badClassFile((flags & STATIC) == 0 ? "invalid.default.interface" : "invalid.static.interface",
1980 Integer.toString(majorVersion),
1981 Integer.toString(minorVersion));
1982 }
1983 }
1984 if (name == names.init && currentOwner.hasOuterInstance()) {
1985 // Sometimes anonymous classes don't have an outer
1986 // instance, however, there is no reliable way to tell so
1987 // we never strip this$n
1988 if (!currentOwner.name.isEmpty())
1989 type = new MethodType(adjustMethodParams(flags, type.getParameterTypes()),
1990 type.getReturnType(),
1991 type.getThrownTypes(),
1992 syms.methodClass);
1993 }
1994 MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner);
1995 if (types.isSignaturePolymorphic(m)) {
1996 m.flags_field |= SIGNATURE_POLYMORPHIC;
1997 }
1998 if (saveParameterNames)
1999 initParameterNames(m);
2000 Symbol prevOwner = currentOwner;
2001 currentOwner = m;
2002 try {
2003 readMemberAttrs(m);
2004 } finally {
2005 currentOwner = prevOwner;
2006 }
2007 if (saveParameterNames)
2008 setParameterNames(m, type);
2009 return m;
2010 }
2011
2012 private List<Type> adjustMethodParams(long flags, List<Type> args) {
2013 boolean isVarargs = (flags & VARARGS) != 0;
2014 if (isVarargs) {
2015 Type varargsElem = args.last();
2016 ListBuffer<Type> adjustedArgs = new ListBuffer<>();
2017 for (Type t : args) {
2018 adjustedArgs.append(t != varargsElem ?
2019 t :
2020 ((ArrayType)t).makeVarargs());
2021 }
2022 args = adjustedArgs.toList();
2023 }
2024 return args.tail;
2025 }
2026
2027 /**
2028 * Init the parameter names array.
2029 * Parameter names are currently inferred from the names in the
2030 * LocalVariableTable attributes of a Code attribute.
2031 * (Note: this means parameter names are currently not available for
2032 * methods without a Code attribute.)
2033 * This method initializes an array in which to store the name indexes
2034 * of parameter names found in LocalVariableTable attributes. It is
2035 * slightly supersized to allow for additional slots with a start_pc of 0.
2036 */
2037 void initParameterNames(MethodSymbol sym) {
2038 // make allowance for synthetic parameters.
2039 final int excessSlots = 4;
2040 int expectedParameterSlots =
2041 Code.width(sym.type.getParameterTypes()) + excessSlots;
2042 if (parameterNameIndices == null
2043 || parameterNameIndices.length < expectedParameterSlots) {
2044 parameterNameIndices = new int[expectedParameterSlots];
2045 } else
2046 Arrays.fill(parameterNameIndices, 0);
2047 haveParameterNameIndices = false;
2048 sawMethodParameters = false;
2049 }
2050
2051 /**
2052 * Set the parameter names for a symbol from the name index in the
2053 * parameterNameIndicies array. The type of the symbol may have changed
2054 * while reading the method attributes (see the Signature attribute).
2055 * This may be because of generic information or because anonymous
2056 * synthetic parameters were added. The original type (as read from
2057 * the method descriptor) is used to help guess the existence of
2058 * anonymous synthetic parameters.
2059 * On completion, sym.savedParameter names will either be null (if
2060 * no parameter names were found in the class file) or will be set to a
2061 * list of names, one per entry in sym.type.getParameterTypes, with
2062 * any missing names represented by the empty name.
2063 */
2064 void setParameterNames(MethodSymbol sym, Type jvmType) {
2065 // if no names were found in the class file, there's nothing more to do
2066 if (!haveParameterNameIndices)
2067 return;
2068 // If we get parameter names from MethodParameters, then we
2069 // don't need to skip.
2070 int firstParam = 0;
2071 if (!sawMethodParameters) {
2072 firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0;
2073 // the code in readMethod may have skipped the first
2074 // parameter when setting up the MethodType. If so, we
2075 // make a corresponding allowance here for the position of
2076 // the first parameter. Note that this assumes the
2077 // skipped parameter has a width of 1 -- i.e. it is not
2078 // a double width type (long or double.)
2079 if (sym.name == names.init && currentOwner.hasOuterInstance()) {
2080 // Sometimes anonymous classes don't have an outer
2081 // instance, however, there is no reliable way to tell so
2082 // we never strip this$n
2083 if (!currentOwner.name.isEmpty())
2084 firstParam += 1;
2085 }
2086
2087 if (sym.type != jvmType) {
2088 // reading the method attributes has caused the
2089 // symbol's type to be changed. (i.e. the Signature
2090 // attribute.) This may happen if there are hidden
2091 // (synthetic) parameters in the descriptor, but not
2092 // in the Signature. The position of these hidden
2093 // parameters is unspecified; for now, assume they are
2094 // at the beginning, and so skip over them. The
2095 // primary case for this is two hidden parameters
2096 // passed into Enum constructors.
2097 int skip = Code.width(jvmType.getParameterTypes())
2098 - Code.width(sym.type.getParameterTypes());
2099 firstParam += skip;
2100 }
2101 }
2102 List<Name> paramNames = List.nil();
2103 int index = firstParam;
2104 for (Type t: sym.type.getParameterTypes()) {
2105 int nameIdx = (index < parameterNameIndices.length
2106 ? parameterNameIndices[index] : 0);
2107 Name name = nameIdx == 0 ? names.empty : readName(nameIdx);
2108 paramNames = paramNames.prepend(name);
2109 index += Code.width(t);
2110 }
2111 sym.savedParameterNames = paramNames.reverse();
2112 }
2113
2114 /**
2115 * skip n bytes
2116 */
2117 void skipBytes(int n) {
2118 bp = bp + n;
2119 }
2120
2121 /** Skip a field or method
2122 */
2123 void skipMember() {
2124 bp = bp + 6;
2125 char ac = nextChar();
2126 for (int i = 0; i < ac; i++) {
2127 bp = bp + 2;
2128 int attrLen = nextInt();
2129 bp = bp + attrLen;
2130 }
2131 }
2132
2133 /** Enter type variables of this classtype and all enclosing ones in
2134 * `typevars'.
2135 */
2136 protected void enterTypevars(Type t) {
2137 if (t.getEnclosingType() != null && t.getEnclosingType().hasTag(CLASS))
2138 enterTypevars(t.getEnclosingType());
2139 for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail)
2140 typevars.enter(xs.head.tsym);
2141 }
2142
2143 protected void enterTypevars(Symbol sym) {
2144 if (sym.owner.kind == MTH) {
2145 enterTypevars(sym.owner);
2146 enterTypevars(sym.owner.owner);
2147 }
2148 enterTypevars(sym.type);
2149 }
2150
2151 /** Read contents of a given class symbol `c'. Both external and internal
2152 * versions of an inner class are read.
2153 */
2154 void readClass(ClassSymbol c) {
2155 ClassType ct = (ClassType)c.type;
2156
2157 // allocate scope for members
2158 c.members_field = WriteableScope.create(c);
2159
2160 // prepare type variable table
2161 typevars = typevars.dup(currentOwner);
2162 if (ct.getEnclosingType().hasTag(CLASS))
2163 enterTypevars(ct.getEnclosingType());
2164
2165 // read flags, or skip if this is an inner class
2166 long flags = adjustClassFlags(nextChar());
2167 if (c.owner.kind == PCK) c.flags_field = flags;
2168
2169 // read own class name and check that it matches
2170 ClassSymbol self = readClassSymbol(nextChar());
2171 if (c != self)
2172 throw badClassFile("class.file.wrong.class",
2173 self.flatname);
2174
2175 // class attributes must be read before class
2176 // skip ahead to read class attributes
2177 int startbp = bp;
2178 nextChar();
2179 char interfaceCount = nextChar();
2180 bp += interfaceCount * 2;
2181 char fieldCount = nextChar();
2182 for (int i = 0; i < fieldCount; i++) skipMember();
2183 char methodCount = nextChar();
2184 for (int i = 0; i < methodCount; i++) skipMember();
2185 readClassAttrs(c);
2186
2187 if (readAllOfClassFile) {
2188 for (int i = 1; i < poolObj.length; i++) readPool(i);
2189 c.pool = new Pool(poolObj.length, poolObj, types);
2190 }
2191
2192 // reset and read rest of classinfo
2193 bp = startbp;
2194 int n = nextChar();
2195 if (ct.supertype_field == null)
2196 ct.supertype_field = (n == 0)
2197 ? Type.noType
2198 : readClassSymbol(n).erasure(types);
2199 n = nextChar();
2200 List<Type> is = List.nil();
2201 for (int i = 0; i < n; i++) {
2202 Type _inter = readClassSymbol(nextChar()).erasure(types);
2203 is = is.prepend(_inter);
2204 }
2205 if (ct.interfaces_field == null)
2206 ct.interfaces_field = is.reverse();
2207
2208 Assert.check(fieldCount == nextChar());
2209 for (int i = 0; i < fieldCount; i++) enterMember(c, readField());
2210 Assert.check(methodCount == nextChar());
2211 for (int i = 0; i < methodCount; i++) enterMember(c, readMethod());
2212
2213 typevars = typevars.leave();
2214 }
2215
2216 /** Read inner class info. For each inner/outer pair allocate a
2217 * member class.
2218 */
2219 void readInnerClasses(ClassSymbol c) {
2220 int n = nextChar();
2221 for (int i = 0; i < n; i++) {
2222 nextChar(); // skip inner class symbol
2223 ClassSymbol outer = readClassSymbol(nextChar());
2224 Name name = readName(nextChar());
2225 if (name == null) name = names.empty;
2226 long flags = adjustClassFlags(nextChar());
2227 if (outer != null) { // we have a member class
2228 if (name == names.empty)
2229 name = names.one;
2230 ClassSymbol member = syms.enterClass(name, outer);
2231 if ((flags & STATIC) == 0) {
2232 ((ClassType)member.type).setEnclosingType(outer.type);
2233 if (member.erasure_field != null)
2234 ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type));
2235 }
2236 if (c == outer) {
2237 member.flags_field = flags;
2238 enterMember(c, member);
2239 }
2240 }
2241 }
2242 }
2243
2244 /** Read a class definition from the bytes in buf.
2245 */
2246 private void readClassBuffer(ClassSymbol c) throws IOException {
2247 int magic = nextInt();
2248 if (magic != JAVA_MAGIC)
2249 throw badClassFile("illegal.start.of.class.file");
2250
2251 minorVersion = nextChar();
2252 majorVersion = nextChar();
2253 int maxMajor = Version.MAX().major;
2254 int maxMinor = Version.MAX().minor;
2255 if (majorVersion > maxMajor ||
2256 majorVersion * 1000 + minorVersion <
2257 Version.MIN().major * 1000 + Version.MIN().minor)
2258 {
2259 if (majorVersion == (maxMajor + 1))
2260 log.warning("big.major.version",
2261 currentClassFile,
2262 majorVersion,
2263 maxMajor);
2264 else
2265 throw badClassFile("wrong.version",
2266 Integer.toString(majorVersion),
2267 Integer.toString(minorVersion),
2268 Integer.toString(maxMajor),
2269 Integer.toString(maxMinor));
2270 }
2271 else if (checkClassFile &&
2272 majorVersion == maxMajor &&
2273 minorVersion > maxMinor)
2274 {
2275 printCCF("found.later.version",
2276 Integer.toString(minorVersion));
2277 }
2278 indexPool();
2279 if (signatureBuffer.length < bp) {
2280 int ns = Integer.highestOneBit(bp) << 1;
2281 signatureBuffer = new byte[ns];
2282 }
2283 readClass(c);
2284 }
2285
2286 public void readClassFile(ClassSymbol c) {
2287 currentOwner = c;
2288 currentClassFile = c.classfile;
2289 warnedAttrs.clear();
2290 filling = true;
2291 try {
2292 bp = 0;
2293 buf = readInputStream(buf, c.classfile.openInputStream());
2294 readClassBuffer(c);
2295 if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) {
2296 List<Type> missing = missingTypeVariables;
2297 List<Type> found = foundTypeVariables;
2298 missingTypeVariables = List.nil();
2299 foundTypeVariables = List.nil();
2300 filling = false;
2301 ClassType ct = (ClassType)currentOwner.type;
2302 ct.supertype_field =
2303 types.subst(ct.supertype_field, missing, found);
2304 ct.interfaces_field =
2305 types.subst(ct.interfaces_field, missing, found);
2306 } else if (missingTypeVariables.isEmpty() !=
2307 foundTypeVariables.isEmpty()) {
2308 Name name = missingTypeVariables.head.tsym.name;
2309 throw badClassFile("undecl.type.var", name);
2310 }
2311 } catch (IOException ex) {
2312 throw badClassFile("unable.to.access.file", ex.getMessage());
2313 } catch (ArrayIndexOutOfBoundsException ex) {
2314 throw badClassFile("bad.class.file", c.flatname);
2315 } finally {
2316 missingTypeVariables = List.nil();
2317 foundTypeVariables = List.nil();
2318 filling = false;
2319 }
2320 }
2321 // where
2322 private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException {
2323 try {
2324 buf = ensureCapacity(buf, s.available());
2325 int r = s.read(buf);
2326 int bp = 0;
2327 while (r != -1) {
2328 bp += r;
2329 buf = ensureCapacity(buf, bp);
2330 r = s.read(buf, bp, buf.length - bp);
2331 }
2332 return buf;
2333 } finally {
2334 try {
2335 s.close();
2336 } catch (IOException e) {
2337 /* Ignore any errors, as this stream may have already
2338 * thrown a related exception which is the one that
2339 * should be reported.
2340 */
2341 }
2342 }
2343 }
2344 /*
2345 * ensureCapacity will increase the buffer as needed, taking note that
2346 * the new buffer will always be greater than the needed and never
2347 * exactly equal to the needed size or bp. If equal then the read (above)
2348 * will infinitely loop as buf.length - bp == 0.
2349 */
2350 private static byte[] ensureCapacity(byte[] buf, int needed) {
2351 if (buf.length <= needed) {
2352 byte[] old = buf;
2353 buf = new byte[Integer.highestOneBit(needed) << 1];
2354 System.arraycopy(old, 0, buf, 0, old.length);
2355 }
2356 return buf;
2357 }
2358
2359 /** We can only read a single class file at a time; this
2360 * flag keeps track of when we are currently reading a class
2361 * file.
2362 */
2363 public boolean filling = false;
2364
2365 /************************************************************************
2366 * Adjusting flags
2367 ***********************************************************************/
2368
2369 long adjustFieldFlags(long flags) {
2370 return flags;
2371 }
2372
2373 long adjustMethodFlags(long flags) {
2374 if ((flags & ACC_BRIDGE) != 0) {
2375 flags &= ~ACC_BRIDGE;
2376 flags |= BRIDGE;
2377 }
2378 if ((flags & ACC_VARARGS) != 0) {
2379 flags &= ~ACC_VARARGS;
2380 flags |= VARARGS;
2381 }
2382 return flags;
2383 }
2384
2385 long adjustClassFlags(long flags) {
2386 return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded
2387 }
2388
2389 /** Output for "-checkclassfile" option.
2390 * @param key The key to look up the correct internationalized string.
2391 * @param arg An argument for substitution into the output string.
2392 */
2393 private void printCCF(String key, Object arg) {
2394 log.printLines(key, arg);
2395 }
2396
2397 /**
2398 * A subclass of JavaFileObject for the sourcefile attribute found in a classfile.
2399 * The attribute is only the last component of the original filename, so is unlikely
2400 * to be valid as is, so operations other than those to access the name throw
2401 * UnsupportedOperationException
2402 */
2403 private static class SourceFileObject extends BaseFileObject {
2404
2405 /** The file's name.
2406 */
2407 private Name name;
2408 private Name flatname;
2409
2410 public SourceFileObject(Name name, Name flatname) {
2411 super(null); // no file manager; never referenced for this file object
2412 this.name = name;
2413 this.flatname = flatname;
2414 }
2415
2416 @Override @DefinedBy(Api.COMPILER)
2417 public URI toUri() {
2418 try {
2419 return new URI(null, name.toString(), null);
2420 } catch (URISyntaxException e) {
2421 throw new CannotCreateUriError(name.toString(), e);
2422 }
2423 }
2424
2425 @Override @DefinedBy(Api.COMPILER)
2426 public String getName() {
2427 return name.toString();
2428 }
2429
2430 @Override
2431 public String getShortName() {
2432 return getName();
2433 }
2434
2435 @Override @DefinedBy(Api.COMPILER)
2436 public JavaFileObject.Kind getKind() {
2437 return getKind(getName());
2438 }
2439
2440 @Override @DefinedBy(Api.COMPILER)
2441 public InputStream openInputStream() {
2442 throw new UnsupportedOperationException();
2443 }
2444
2445 @Override @DefinedBy(Api.COMPILER)
2446 public OutputStream openOutputStream() {
2447 throw new UnsupportedOperationException();
2448 }
2449
2450 @Override @DefinedBy(Api.COMPILER)
2451 public CharBuffer getCharContent(boolean ignoreEncodingErrors) {
2452 throw new UnsupportedOperationException();
2453 }
2454
2455 @Override @DefinedBy(Api.COMPILER)
2456 public Reader openReader(boolean ignoreEncodingErrors) {
2457 throw new UnsupportedOperationException();
2458 }
2459
2460 @Override @DefinedBy(Api.COMPILER)
2461 public Writer openWriter() {
2462 throw new UnsupportedOperationException();
2463 }
2464
2465 @Override @DefinedBy(Api.COMPILER)
2466 public long getLastModified() {
2467 throw new UnsupportedOperationException();
2468 }
2469
2470 @Override @DefinedBy(Api.COMPILER)
2471 public boolean delete() {
2472 throw new UnsupportedOperationException();
2473 }
2474
2475 @Override
2476 protected String inferBinaryName(Iterable<? extends Path> path) {
2477 return flatname.toString();
2478 }
2479
2480 @Override @DefinedBy(Api.COMPILER)
2481 public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) {
2482 return true; // fail-safe mode
2483 }
2484
2485 /**
2486 * Check if two file objects are equal.
2487 * SourceFileObjects are just placeholder objects for the value of a
2488 * SourceFile attribute, and do not directly represent specific files.
2489 * Two SourceFileObjects are equal if their names are equal.
2490 */
2491 @Override
2492 public boolean equals(Object other) {
2493 if (this == other)
2494 return true;
2495
2496 if (!(other instanceof SourceFileObject))
2497 return false;
2498
2499 SourceFileObject o = (SourceFileObject) other;
2500 return name.equals(o.name);
2501 }
2502
2503 @Override
2504 public int hashCode() {
2505 return name.hashCode();
2506 }
2507 }
2508 }