Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/jvm/ClassReader.java@5cf6c432ef2f
src/share/classes/com/sun/tools/javac/jvm/ClassReader.java
Tue, 18 Jan 2011 08:37:05 -0800
- author
- ksrini
- date
- Tue, 18 Jan 2011 08:37:05 -0800
- changeset 826
- 5cf6c432ef2f
- parent 816
- 7c537f4298fb
- child 857
- 3aa269645199
- permissions
- -rw-r--r--
6982999: tools must support -target 7 bytecodes
Reviewed-by: jjg, jrose
1 /*
2 * Copyright (c) 1999, 2011, 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 */
26 package com.sun.tools.javac.jvm;
28 import java.io.*;
29 import java.net.URI;
30 import java.net.URISyntaxException;
31 import java.nio.CharBuffer;
32 import java.util.Arrays;
33 import java.util.EnumSet;
34 import java.util.HashMap;
35 import java.util.HashSet;
36 import java.util.Map;
37 import java.util.Set;
38 import javax.lang.model.SourceVersion;
39 import javax.tools.JavaFileObject;
40 import javax.tools.JavaFileManager;
41 import javax.tools.JavaFileManager.Location;
42 import javax.tools.StandardJavaFileManager;
44 import static javax.tools.StandardLocation.*;
46 import com.sun.tools.javac.comp.Annotate;
47 import com.sun.tools.javac.code.*;
48 import com.sun.tools.javac.code.Lint.LintCategory;
49 import com.sun.tools.javac.code.Type.*;
50 import com.sun.tools.javac.code.Symbol.*;
51 import com.sun.tools.javac.code.Symtab;
52 import com.sun.tools.javac.file.BaseFileObject;
53 import com.sun.tools.javac.util.*;
54 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
56 import static com.sun.tools.javac.code.Flags.*;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.TypeTags.*;
59 import static com.sun.tools.javac.jvm.ClassFile.*;
60 import static com.sun.tools.javac.jvm.ClassFile.Version.*;
62 import static com.sun.tools.javac.main.OptionName.*;
64 /** This class provides operations to read a classfile into an internal
65 * representation. The internal representation is anchored in a
66 * ClassSymbol which contains in its scope symbol representations
67 * for all other definitions in the classfile. Top-level Classes themselves
68 * appear as members of the scopes of PackageSymbols.
69 *
70 * <p><b>This is NOT part of any supported API.
71 * If you write code that depends on this, you do so at your own risk.
72 * This code and its internal interfaces are subject to change or
73 * deletion without notice.</b>
74 */
75 public class ClassReader implements Completer {
76 /** The context key for the class reader. */
77 protected static final Context.Key<ClassReader> classReaderKey =
78 new Context.Key<ClassReader>();
80 public static final int INITIAL_BUFFER_SIZE = 0x0fff0;
82 Annotate annotate;
84 /** Switch: verbose output.
85 */
86 boolean verbose;
88 /** Switch: check class file for correct minor version, unrecognized
89 * attributes.
90 */
91 boolean checkClassFile;
93 /** Switch: read constant pool and code sections. This switch is initially
94 * set to false but can be turned on from outside.
95 */
96 public boolean readAllOfClassFile = false;
98 /** Switch: read GJ signature information.
99 */
100 boolean allowGenerics;
102 /** Switch: read varargs attribute.
103 */
104 boolean allowVarargs;
106 /** Switch: allow annotations.
107 */
108 boolean allowAnnotations;
110 /** Switch: allow simplified varargs.
111 */
112 boolean allowSimplifiedVarargs;
114 /** Lint option: warn about classfile issues
115 */
116 boolean lintClassfile;
119 /** Switch: preserve parameter names from the variable table.
120 */
121 public boolean saveParameterNames;
123 /**
124 * Switch: cache completion failures unless -XDdev is used
125 */
126 private boolean cacheCompletionFailure;
128 /**
129 * Switch: prefer source files instead of newer when both source
130 * and class are available
131 **/
132 public boolean preferSource;
134 /** The log to use for verbose output
135 */
136 final Log log;
138 /** The symbol table. */
139 Symtab syms;
141 /** The scope counter */
142 Scope.ScopeCounter scopeCounter;
144 Types types;
146 /** The name table. */
147 final Names names;
149 /** Force a completion failure on this name
150 */
151 final Name completionFailureName;
153 /** Access to files
154 */
155 private final JavaFileManager fileManager;
157 /** Factory for diagnostics
158 */
159 JCDiagnostic.Factory diagFactory;
161 /** Can be reassigned from outside:
162 * the completer to be used for ".java" files. If this remains unassigned
163 * ".java" files will not be loaded.
164 */
165 public SourceCompleter sourceCompleter = null;
167 /** A hashtable containing the encountered top-level and member classes,
168 * indexed by flat names. The table does not contain local classes.
169 */
170 private Map<Name,ClassSymbol> classes;
172 /** A hashtable containing the encountered packages.
173 */
174 private Map<Name, PackageSymbol> packages;
176 /** The current scope where type variables are entered.
177 */
178 protected Scope typevars;
180 /** The path name of the class file currently being read.
181 */
182 protected JavaFileObject currentClassFile = null;
184 /** The class or method currently being read.
185 */
186 protected Symbol currentOwner = null;
188 /** The buffer containing the currently read class file.
189 */
190 byte[] buf = new byte[INITIAL_BUFFER_SIZE];
192 /** The current input pointer.
193 */
194 int bp;
196 /** The objects of the constant pool.
197 */
198 Object[] poolObj;
200 /** For every constant pool entry, an index into buf where the
201 * defining section of the entry is found.
202 */
203 int[] poolIdx;
205 /** The major version number of the class file being read. */
206 int majorVersion;
207 /** The minor version number of the class file being read. */
208 int minorVersion;
210 /** A table to hold the constant pool indices for method parameter
211 * names, as given in LocalVariableTable attributes.
212 */
213 int[] parameterNameIndices;
215 /**
216 * Whether or not any parameter names have been found.
217 */
218 boolean haveParameterNameIndices;
220 /**
221 * The set of attribute names for which warnings have been generated for the current class
222 */
223 Set<Name> warnedAttrs = new HashSet<Name>();
225 /** Get the ClassReader instance for this invocation. */
226 public static ClassReader instance(Context context) {
227 ClassReader instance = context.get(classReaderKey);
228 if (instance == null)
229 instance = new ClassReader(context, true);
230 return instance;
231 }
233 /** Initialize classes and packages, treating this as the definitive classreader. */
234 public void init(Symtab syms) {
235 init(syms, true);
236 }
238 /** Initialize classes and packages, optionally treating this as
239 * the definitive classreader.
240 */
241 private void init(Symtab syms, boolean definitive) {
242 if (classes != null) return;
244 if (definitive) {
245 Assert.check(packages == null || packages == syms.packages);
246 packages = syms.packages;
247 Assert.check(classes == null || classes == syms.classes);
248 classes = syms.classes;
249 } else {
250 packages = new HashMap<Name, PackageSymbol>();
251 classes = new HashMap<Name, ClassSymbol>();
252 }
254 packages.put(names.empty, syms.rootPackage);
255 syms.rootPackage.completer = this;
256 syms.unnamedPackage.completer = this;
257 }
259 /** Construct a new class reader, optionally treated as the
260 * definitive classreader for this invocation.
261 */
262 protected ClassReader(Context context, boolean definitive) {
263 if (definitive) context.put(classReaderKey, this);
265 names = Names.instance(context);
266 syms = Symtab.instance(context);
267 scopeCounter = Scope.ScopeCounter.instance(context);
268 types = Types.instance(context);
269 fileManager = context.get(JavaFileManager.class);
270 if (fileManager == null)
271 throw new AssertionError("FileManager initialization error");
272 diagFactory = JCDiagnostic.Factory.instance(context);
274 init(syms, definitive);
275 log = Log.instance(context);
277 Options options = Options.instance(context);
278 annotate = Annotate.instance(context);
279 verbose = options.isSet(VERBOSE);
280 checkClassFile = options.isSet("-checkclassfile");
281 Source source = Source.instance(context);
282 allowGenerics = source.allowGenerics();
283 allowVarargs = source.allowVarargs();
284 allowAnnotations = source.allowAnnotations();
285 allowSimplifiedVarargs = source.allowSimplifiedVarargs();
286 saveParameterNames = options.isSet("save-parameter-names");
287 cacheCompletionFailure = options.isUnset("dev");
288 preferSource = "source".equals(options.get("-Xprefer"));
290 completionFailureName =
291 options.isSet("failcomplete")
292 ? names.fromString(options.get("failcomplete"))
293 : null;
295 typevars = new Scope(syms.noSymbol);
297 lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE);
299 initAttributeReaders();
300 }
302 /** Add member to class unless it is synthetic.
303 */
304 private void enterMember(ClassSymbol c, Symbol sym) {
305 if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC)
306 c.members_field.enter(sym);
307 }
309 /************************************************************************
310 * Error Diagnoses
311 ***********************************************************************/
314 public class BadClassFile extends CompletionFailure {
315 private static final long serialVersionUID = 0;
317 public BadClassFile(TypeSymbol sym, JavaFileObject file, JCDiagnostic diag) {
318 super(sym, createBadClassFileDiagnostic(file, diag));
319 }
320 }
321 // where
322 private JCDiagnostic createBadClassFileDiagnostic(JavaFileObject file, JCDiagnostic diag) {
323 String key = (file.getKind() == JavaFileObject.Kind.SOURCE
324 ? "bad.source.file.header" : "bad.class.file.header");
325 return diagFactory.fragment(key, file, diag);
326 }
328 public BadClassFile badClassFile(String key, Object... args) {
329 return new BadClassFile (
330 currentOwner.enclClass(),
331 currentClassFile,
332 diagFactory.fragment(key, args));
333 }
335 /************************************************************************
336 * Buffer Access
337 ***********************************************************************/
339 /** Read a character.
340 */
341 char nextChar() {
342 return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF));
343 }
345 /** Read a byte.
346 */
347 byte nextByte() {
348 return buf[bp++];
349 }
351 /** Read an integer.
352 */
353 int nextInt() {
354 return
355 ((buf[bp++] & 0xFF) << 24) +
356 ((buf[bp++] & 0xFF) << 16) +
357 ((buf[bp++] & 0xFF) << 8) +
358 (buf[bp++] & 0xFF);
359 }
361 /** Extract a character at position bp from buf.
362 */
363 char getChar(int bp) {
364 return
365 (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF));
366 }
368 /** Extract an integer at position bp from buf.
369 */
370 int getInt(int bp) {
371 return
372 ((buf[bp] & 0xFF) << 24) +
373 ((buf[bp+1] & 0xFF) << 16) +
374 ((buf[bp+2] & 0xFF) << 8) +
375 (buf[bp+3] & 0xFF);
376 }
379 /** Extract a long integer at position bp from buf.
380 */
381 long getLong(int bp) {
382 DataInputStream bufin =
383 new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
384 try {
385 return bufin.readLong();
386 } catch (IOException e) {
387 throw new AssertionError(e);
388 }
389 }
391 /** Extract a float at position bp from buf.
392 */
393 float getFloat(int bp) {
394 DataInputStream bufin =
395 new DataInputStream(new ByteArrayInputStream(buf, bp, 4));
396 try {
397 return bufin.readFloat();
398 } catch (IOException e) {
399 throw new AssertionError(e);
400 }
401 }
403 /** Extract a double at position bp from buf.
404 */
405 double getDouble(int bp) {
406 DataInputStream bufin =
407 new DataInputStream(new ByteArrayInputStream(buf, bp, 8));
408 try {
409 return bufin.readDouble();
410 } catch (IOException e) {
411 throw new AssertionError(e);
412 }
413 }
415 /************************************************************************
416 * Constant Pool Access
417 ***********************************************************************/
419 /** Index all constant pool entries, writing their start addresses into
420 * poolIdx.
421 */
422 void indexPool() {
423 poolIdx = new int[nextChar()];
424 poolObj = new Object[poolIdx.length];
425 int i = 1;
426 while (i < poolIdx.length) {
427 poolIdx[i++] = bp;
428 byte tag = buf[bp++];
429 switch (tag) {
430 case CONSTANT_Utf8: case CONSTANT_Unicode: {
431 int len = nextChar();
432 bp = bp + len;
433 break;
434 }
435 case CONSTANT_Class:
436 case CONSTANT_String:
437 case CONSTANT_MethodType:
438 bp = bp + 2;
439 break;
440 case CONSTANT_MethodHandle:
441 bp = bp + 3;
442 break;
443 case CONSTANT_Fieldref:
444 case CONSTANT_Methodref:
445 case CONSTANT_InterfaceMethodref:
446 case CONSTANT_NameandType:
447 case CONSTANT_Integer:
448 case CONSTANT_Float:
449 case CONSTANT_InvokeDynamic:
450 bp = bp + 4;
451 break;
452 case CONSTANT_Long:
453 case CONSTANT_Double:
454 bp = bp + 8;
455 i++;
456 break;
457 default:
458 throw badClassFile("bad.const.pool.tag.at",
459 Byte.toString(tag),
460 Integer.toString(bp -1));
461 }
462 }
463 }
465 /** Read constant pool entry at start address i, use pool as a cache.
466 */
467 Object readPool(int i) {
468 Object result = poolObj[i];
469 if (result != null) return result;
471 int index = poolIdx[i];
472 if (index == 0) return null;
474 byte tag = buf[index];
475 switch (tag) {
476 case CONSTANT_Utf8:
477 poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1));
478 break;
479 case CONSTANT_Unicode:
480 throw badClassFile("unicode.str.not.supported");
481 case CONSTANT_Class:
482 poolObj[i] = readClassOrType(getChar(index + 1));
483 break;
484 case CONSTANT_String:
485 // FIXME: (footprint) do not use toString here
486 poolObj[i] = readName(getChar(index + 1)).toString();
487 break;
488 case CONSTANT_Fieldref: {
489 ClassSymbol owner = readClassSymbol(getChar(index + 1));
490 NameAndType nt = (NameAndType)readPool(getChar(index + 3));
491 poolObj[i] = new VarSymbol(0, nt.name, nt.type, owner);
492 break;
493 }
494 case CONSTANT_Methodref:
495 case CONSTANT_InterfaceMethodref: {
496 ClassSymbol owner = readClassSymbol(getChar(index + 1));
497 NameAndType nt = (NameAndType)readPool(getChar(index + 3));
498 poolObj[i] = new MethodSymbol(0, nt.name, nt.type, owner);
499 break;
500 }
501 case CONSTANT_NameandType:
502 poolObj[i] = new NameAndType(
503 readName(getChar(index + 1)),
504 readType(getChar(index + 3)));
505 break;
506 case CONSTANT_Integer:
507 poolObj[i] = getInt(index + 1);
508 break;
509 case CONSTANT_Float:
510 poolObj[i] = new Float(getFloat(index + 1));
511 break;
512 case CONSTANT_Long:
513 poolObj[i] = new Long(getLong(index + 1));
514 break;
515 case CONSTANT_Double:
516 poolObj[i] = new Double(getDouble(index + 1));
517 break;
518 case CONSTANT_MethodHandle:
519 skipBytes(4);
520 break;
521 case CONSTANT_MethodType:
522 skipBytes(3);
523 break;
524 case CONSTANT_InvokeDynamic:
525 skipBytes(5);
526 break;
527 default:
528 throw badClassFile("bad.const.pool.tag", Byte.toString(tag));
529 }
530 return poolObj[i];
531 }
533 /** Read signature and convert to type.
534 */
535 Type readType(int i) {
536 int index = poolIdx[i];
537 return sigToType(buf, index + 3, getChar(index + 1));
538 }
540 /** If name is an array type or class signature, return the
541 * corresponding type; otherwise return a ClassSymbol with given name.
542 */
543 Object readClassOrType(int i) {
544 int index = poolIdx[i];
545 int len = getChar(index + 1);
546 int start = index + 3;
547 Assert.check(buf[start] == '[' || buf[start + len - 1] != ';');
548 // by the above assertion, the following test can be
549 // simplified to (buf[start] == '[')
550 return (buf[start] == '[' || buf[start + len - 1] == ';')
551 ? (Object)sigToType(buf, start, len)
552 : (Object)enterClass(names.fromUtf(internalize(buf, start,
553 len)));
554 }
556 /** Read signature and convert to type parameters.
557 */
558 List<Type> readTypeParams(int i) {
559 int index = poolIdx[i];
560 return sigToTypeParams(buf, index + 3, getChar(index + 1));
561 }
563 /** Read class entry.
564 */
565 ClassSymbol readClassSymbol(int i) {
566 return (ClassSymbol) (readPool(i));
567 }
569 /** Read name.
570 */
571 Name readName(int i) {
572 return (Name) (readPool(i));
573 }
575 /************************************************************************
576 * Reading Types
577 ***********************************************************************/
579 /** The unread portion of the currently read type is
580 * signature[sigp..siglimit-1].
581 */
582 byte[] signature;
583 int sigp;
584 int siglimit;
585 boolean sigEnterPhase = false;
587 /** Convert signature to type, where signature is a byte array segment.
588 */
589 Type sigToType(byte[] sig, int offset, int len) {
590 signature = sig;
591 sigp = offset;
592 siglimit = offset + len;
593 return sigToType();
594 }
596 /** Convert signature to type, where signature is implicit.
597 */
598 Type sigToType() {
599 switch ((char) signature[sigp]) {
600 case 'T':
601 sigp++;
602 int start = sigp;
603 while (signature[sigp] != ';') sigp++;
604 sigp++;
605 return sigEnterPhase
606 ? Type.noType
607 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start));
608 case '+': {
609 sigp++;
610 Type t = sigToType();
611 return new WildcardType(t, BoundKind.EXTENDS,
612 syms.boundClass);
613 }
614 case '*':
615 sigp++;
616 return new WildcardType(syms.objectType, BoundKind.UNBOUND,
617 syms.boundClass);
618 case '-': {
619 sigp++;
620 Type t = sigToType();
621 return new WildcardType(t, BoundKind.SUPER,
622 syms.boundClass);
623 }
624 case 'B':
625 sigp++;
626 return syms.byteType;
627 case 'C':
628 sigp++;
629 return syms.charType;
630 case 'D':
631 sigp++;
632 return syms.doubleType;
633 case 'F':
634 sigp++;
635 return syms.floatType;
636 case 'I':
637 sigp++;
638 return syms.intType;
639 case 'J':
640 sigp++;
641 return syms.longType;
642 case 'L':
643 {
644 // int oldsigp = sigp;
645 Type t = classSigToType();
646 if (sigp < siglimit && signature[sigp] == '.')
647 throw badClassFile("deprecated inner class signature syntax " +
648 "(please recompile from source)");
649 /*
650 System.err.println(" decoded " +
651 new String(signature, oldsigp, sigp-oldsigp) +
652 " => " + t + " outer " + t.outer());
653 */
654 return t;
655 }
656 case 'S':
657 sigp++;
658 return syms.shortType;
659 case 'V':
660 sigp++;
661 return syms.voidType;
662 case 'Z':
663 sigp++;
664 return syms.booleanType;
665 case '[':
666 sigp++;
667 return new ArrayType(sigToType(), syms.arrayClass);
668 case '(':
669 sigp++;
670 List<Type> argtypes = sigToTypes(')');
671 Type restype = sigToType();
672 List<Type> thrown = List.nil();
673 while (signature[sigp] == '^') {
674 sigp++;
675 thrown = thrown.prepend(sigToType());
676 }
677 return new MethodType(argtypes,
678 restype,
679 thrown.reverse(),
680 syms.methodClass);
681 case '<':
682 typevars = typevars.dup(currentOwner);
683 Type poly = new ForAll(sigToTypeParams(), sigToType());
684 typevars = typevars.leave();
685 return poly;
686 default:
687 throw badClassFile("bad.signature",
688 Convert.utf2string(signature, sigp, 10));
689 }
690 }
692 byte[] signatureBuffer = new byte[0];
693 int sbp = 0;
694 /** Convert class signature to type, where signature is implicit.
695 */
696 Type classSigToType() {
697 if (signature[sigp] != 'L')
698 throw badClassFile("bad.class.signature",
699 Convert.utf2string(signature, sigp, 10));
700 sigp++;
701 Type outer = Type.noType;
702 int startSbp = sbp;
704 while (true) {
705 final byte c = signature[sigp++];
706 switch (c) {
708 case ';': { // end
709 ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
710 startSbp,
711 sbp - startSbp));
712 if (outer == Type.noType)
713 outer = t.erasure(types);
714 else
715 outer = new ClassType(outer, List.<Type>nil(), t);
716 sbp = startSbp;
717 return outer;
718 }
720 case '<': // generic arguments
721 ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
722 startSbp,
723 sbp - startSbp));
724 outer = new ClassType(outer, sigToTypes('>'), t) {
725 boolean completed = false;
726 @Override
727 public Type getEnclosingType() {
728 if (!completed) {
729 completed = true;
730 tsym.complete();
731 Type enclosingType = tsym.type.getEnclosingType();
732 if (enclosingType != Type.noType) {
733 List<Type> typeArgs =
734 super.getEnclosingType().allparams();
735 List<Type> typeParams =
736 enclosingType.allparams();
737 if (typeParams.length() != typeArgs.length()) {
738 // no "rare" types
739 super.setEnclosingType(types.erasure(enclosingType));
740 } else {
741 super.setEnclosingType(types.subst(enclosingType,
742 typeParams,
743 typeArgs));
744 }
745 } else {
746 super.setEnclosingType(Type.noType);
747 }
748 }
749 return super.getEnclosingType();
750 }
751 @Override
752 public void setEnclosingType(Type outer) {
753 throw new UnsupportedOperationException();
754 }
755 };
756 switch (signature[sigp++]) {
757 case ';':
758 if (sigp < signature.length && signature[sigp] == '.') {
759 // support old-style GJC signatures
760 // The signature produced was
761 // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>;
762 // rather than say
763 // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>;
764 // so we skip past ".Lfoo/Outer$"
765 sigp += (sbp - startSbp) + // "foo/Outer"
766 3; // ".L" and "$"
767 signatureBuffer[sbp++] = (byte)'$';
768 break;
769 } else {
770 sbp = startSbp;
771 return outer;
772 }
773 case '.':
774 signatureBuffer[sbp++] = (byte)'$';
775 break;
776 default:
777 throw new AssertionError(signature[sigp-1]);
778 }
779 continue;
781 case '.':
782 signatureBuffer[sbp++] = (byte)'$';
783 continue;
784 case '/':
785 signatureBuffer[sbp++] = (byte)'.';
786 continue;
787 default:
788 signatureBuffer[sbp++] = c;
789 continue;
790 }
791 }
792 }
794 /** Convert (implicit) signature to list of types
795 * until `terminator' is encountered.
796 */
797 List<Type> sigToTypes(char terminator) {
798 List<Type> head = List.of(null);
799 List<Type> tail = head;
800 while (signature[sigp] != terminator)
801 tail = tail.setTail(List.of(sigToType()));
802 sigp++;
803 return head.tail;
804 }
806 /** Convert signature to type parameters, where signature is a byte
807 * array segment.
808 */
809 List<Type> sigToTypeParams(byte[] sig, int offset, int len) {
810 signature = sig;
811 sigp = offset;
812 siglimit = offset + len;
813 return sigToTypeParams();
814 }
816 /** Convert signature to type parameters, where signature is implicit.
817 */
818 List<Type> sigToTypeParams() {
819 List<Type> tvars = List.nil();
820 if (signature[sigp] == '<') {
821 sigp++;
822 int start = sigp;
823 sigEnterPhase = true;
824 while (signature[sigp] != '>')
825 tvars = tvars.prepend(sigToTypeParam());
826 sigEnterPhase = false;
827 sigp = start;
828 while (signature[sigp] != '>')
829 sigToTypeParam();
830 sigp++;
831 }
832 return tvars.reverse();
833 }
835 /** Convert (implicit) signature to type parameter.
836 */
837 Type sigToTypeParam() {
838 int start = sigp;
839 while (signature[sigp] != ':') sigp++;
840 Name name = names.fromUtf(signature, start, sigp - start);
841 TypeVar tvar;
842 if (sigEnterPhase) {
843 tvar = new TypeVar(name, currentOwner, syms.botType);
844 typevars.enter(tvar.tsym);
845 } else {
846 tvar = (TypeVar)findTypeVar(name);
847 }
848 List<Type> bounds = List.nil();
849 Type st = null;
850 if (signature[sigp] == ':' && signature[sigp+1] == ':') {
851 sigp++;
852 st = syms.objectType;
853 }
854 while (signature[sigp] == ':') {
855 sigp++;
856 bounds = bounds.prepend(sigToType());
857 }
858 if (!sigEnterPhase) {
859 types.setBounds(tvar, bounds.reverse(), st);
860 }
861 return tvar;
862 }
864 /** Find type variable with given name in `typevars' scope.
865 */
866 Type findTypeVar(Name name) {
867 Scope.Entry e = typevars.lookup(name);
868 if (e.scope != null) {
869 return e.sym.type;
870 } else {
871 if (readingClassAttr) {
872 // While reading the class attribute, the supertypes
873 // might refer to a type variable from an enclosing element
874 // (method or class).
875 // If the type variable is defined in the enclosing class,
876 // we can actually find it in
877 // currentOwner.owner.type.getTypeArguments()
878 // However, until we have read the enclosing method attribute
879 // we don't know for sure if this owner is correct. It could
880 // be a method and there is no way to tell before reading the
881 // enclosing method attribute.
882 TypeVar t = new TypeVar(name, currentOwner, syms.botType);
883 missingTypeVariables = missingTypeVariables.prepend(t);
884 // System.err.println("Missing type var " + name);
885 return t;
886 }
887 throw badClassFile("undecl.type.var", name);
888 }
889 }
891 /************************************************************************
892 * Reading Attributes
893 ***********************************************************************/
895 protected enum AttributeKind { CLASS, MEMBER };
896 protected abstract class AttributeReader {
897 AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) {
898 this.name = name;
899 this.version = version;
900 this.kinds = kinds;
901 }
903 boolean accepts(AttributeKind kind) {
904 if (kinds.contains(kind)) {
905 if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor))
906 return true;
908 if (lintClassfile && !warnedAttrs.contains(name)) {
909 JavaFileObject prev = log.useSource(currentClassFile);
910 try {
911 log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null, "future.attr",
912 name, version.major, version.minor, majorVersion, minorVersion);
913 } finally {
914 log.useSource(prev);
915 }
916 warnedAttrs.add(name);
917 }
918 }
919 return false;
920 }
922 abstract void read(Symbol sym, int attrLen);
924 final Name name;
925 final ClassFile.Version version;
926 final Set<AttributeKind> kinds;
927 }
929 protected Set<AttributeKind> CLASS_ATTRIBUTE =
930 EnumSet.of(AttributeKind.CLASS);
931 protected Set<AttributeKind> MEMBER_ATTRIBUTE =
932 EnumSet.of(AttributeKind.MEMBER);
933 protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE =
934 EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER);
936 protected Map<Name, AttributeReader> attributeReaders = new HashMap<Name, AttributeReader>();
938 private void initAttributeReaders() {
939 AttributeReader[] readers = {
940 // v45.3 attributes
942 new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) {
943 void read(Symbol sym, int attrLen) {
944 if (readAllOfClassFile || saveParameterNames)
945 ((MethodSymbol)sym).code = readCode(sym);
946 else
947 bp = bp + attrLen;
948 }
949 },
951 new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) {
952 void read(Symbol sym, int attrLen) {
953 Object v = readPool(nextChar());
954 // Ignore ConstantValue attribute if field not final.
955 if ((sym.flags() & FINAL) != 0)
956 ((VarSymbol) sym).setData(v);
957 }
958 },
960 new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
961 void read(Symbol sym, int attrLen) {
962 sym.flags_field |= DEPRECATED;
963 }
964 },
966 new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
967 void read(Symbol sym, int attrLen) {
968 int nexceptions = nextChar();
969 List<Type> thrown = List.nil();
970 for (int j = 0; j < nexceptions; j++)
971 thrown = thrown.prepend(readClassSymbol(nextChar()).type);
972 if (sym.type.getThrownTypes().isEmpty())
973 sym.type.asMethodType().thrown = thrown.reverse();
974 }
975 },
977 new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) {
978 void read(Symbol sym, int attrLen) {
979 ClassSymbol c = (ClassSymbol) sym;
980 readInnerClasses(c);
981 }
982 },
984 new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
985 void read(Symbol sym, int attrLen) {
986 int newbp = bp + attrLen;
987 if (saveParameterNames) {
988 // Pick up parameter names from the variable table.
989 // Parameter names are not explicitly identified as such,
990 // but all parameter name entries in the LocalVariableTable
991 // have a start_pc of 0. Therefore, we record the name
992 // indicies of all slots with a start_pc of zero in the
993 // parameterNameIndicies array.
994 // Note that this implicitly honors the JVMS spec that
995 // there may be more than one LocalVariableTable, and that
996 // there is no specified ordering for the entries.
997 int numEntries = nextChar();
998 for (int i = 0; i < numEntries; i++) {
999 int start_pc = nextChar();
1000 int length = nextChar();
1001 int nameIndex = nextChar();
1002 int sigIndex = nextChar();
1003 int register = nextChar();
1004 if (start_pc == 0) {
1005 // ensure array large enough
1006 if (register >= parameterNameIndices.length) {
1007 int newSize = Math.max(register, parameterNameIndices.length + 8);
1008 parameterNameIndices =
1009 Arrays.copyOf(parameterNameIndices, newSize);
1010 }
1011 parameterNameIndices[register] = nameIndex;
1012 haveParameterNameIndices = true;
1013 }
1014 }
1015 }
1016 bp = newbp;
1017 }
1018 },
1020 new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) {
1021 void read(Symbol sym, int attrLen) {
1022 ClassSymbol c = (ClassSymbol) sym;
1023 Name n = readName(nextChar());
1024 c.sourcefile = new SourceFileObject(n, c.flatname);
1025 }
1026 },
1028 new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
1029 void read(Symbol sym, int attrLen) {
1030 // bridge methods are visible when generics not enabled
1031 if (allowGenerics || (sym.flags_field & BRIDGE) == 0)
1032 sym.flags_field |= SYNTHETIC;
1033 }
1034 },
1036 // standard v49 attributes
1038 new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) {
1039 void read(Symbol sym, int attrLen) {
1040 int newbp = bp + attrLen;
1041 readEnclosingMethodAttr(sym);
1042 bp = newbp;
1043 }
1044 },
1046 new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1047 @Override
1048 boolean accepts(AttributeKind kind) {
1049 return super.accepts(kind) && allowGenerics;
1050 }
1052 void read(Symbol sym, int attrLen) {
1053 if (sym.kind == TYP) {
1054 ClassSymbol c = (ClassSymbol) sym;
1055 readingClassAttr = true;
1056 try {
1057 ClassType ct1 = (ClassType)c.type;
1058 Assert.check(c == currentOwner);
1059 ct1.typarams_field = readTypeParams(nextChar());
1060 ct1.supertype_field = sigToType();
1061 ListBuffer<Type> is = new ListBuffer<Type>();
1062 while (sigp != siglimit) is.append(sigToType());
1063 ct1.interfaces_field = is.toList();
1064 } finally {
1065 readingClassAttr = false;
1066 }
1067 } else {
1068 List<Type> thrown = sym.type.getThrownTypes();
1069 sym.type = readType(nextChar());
1070 //- System.err.println(" # " + sym.type);
1071 if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty())
1072 sym.type.asMethodType().thrown = thrown;
1074 }
1075 }
1076 },
1078 // v49 annotation attributes
1080 new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1081 void read(Symbol sym, int attrLen) {
1082 attachAnnotationDefault(sym);
1083 }
1084 },
1086 new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1087 void read(Symbol sym, int attrLen) {
1088 attachAnnotations(sym);
1089 }
1090 },
1092 new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1093 void read(Symbol sym, int attrLen) {
1094 attachParameterAnnotations(sym);
1095 }
1096 },
1098 new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1099 void read(Symbol sym, int attrLen) {
1100 attachAnnotations(sym);
1101 }
1102 },
1104 new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1105 void read(Symbol sym, int attrLen) {
1106 attachParameterAnnotations(sym);
1107 }
1108 },
1110 // additional "legacy" v49 attributes, superceded by flags
1112 new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1113 void read(Symbol sym, int attrLen) {
1114 if (allowAnnotations)
1115 sym.flags_field |= ANNOTATION;
1116 }
1117 },
1119 new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) {
1120 void read(Symbol sym, int attrLen) {
1121 sym.flags_field |= BRIDGE;
1122 if (!allowGenerics)
1123 sym.flags_field &= ~SYNTHETIC;
1124 }
1125 },
1127 new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1128 void read(Symbol sym, int attrLen) {
1129 sym.flags_field |= ENUM;
1130 }
1131 },
1133 new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
1134 void read(Symbol sym, int attrLen) {
1135 if (allowVarargs)
1136 sym.flags_field |= VARARGS;
1137 }
1138 },
1140 // The following attributes for a Code attribute are not currently handled
1141 // StackMapTable
1142 // SourceDebugExtension
1143 // LineNumberTable
1144 // LocalVariableTypeTable
1145 };
1147 for (AttributeReader r: readers)
1148 attributeReaders.put(r.name, r);
1149 }
1151 /** Report unrecognized attribute.
1152 */
1153 void unrecognized(Name attrName) {
1154 if (checkClassFile)
1155 printCCF("ccf.unrecognized.attribute", attrName);
1156 }
1160 void readEnclosingMethodAttr(Symbol sym) {
1161 // sym is a nested class with an "Enclosing Method" attribute
1162 // remove sym from it's current owners scope and place it in
1163 // the scope specified by the attribute
1164 sym.owner.members().remove(sym);
1165 ClassSymbol self = (ClassSymbol)sym;
1166 ClassSymbol c = readClassSymbol(nextChar());
1167 NameAndType nt = (NameAndType)readPool(nextChar());
1169 MethodSymbol m = findMethod(nt, c.members_field, self.flags());
1170 if (nt != null && m == null)
1171 throw badClassFile("bad.enclosing.method", self);
1173 self.name = simpleBinaryName(self.flatname, c.flatname) ;
1174 self.owner = m != null ? m : c;
1175 if (self.name.isEmpty())
1176 self.fullname = names.empty;
1177 else
1178 self.fullname = ClassSymbol.formFullName(self.name, self.owner);
1180 if (m != null) {
1181 ((ClassType)sym.type).setEnclosingType(m.type);
1182 } else if ((self.flags_field & STATIC) == 0) {
1183 ((ClassType)sym.type).setEnclosingType(c.type);
1184 } else {
1185 ((ClassType)sym.type).setEnclosingType(Type.noType);
1186 }
1187 enterTypevars(self);
1188 if (!missingTypeVariables.isEmpty()) {
1189 ListBuffer<Type> typeVars = new ListBuffer<Type>();
1190 for (Type typevar : missingTypeVariables) {
1191 typeVars.append(findTypeVar(typevar.tsym.name));
1192 }
1193 foundTypeVariables = typeVars.toList();
1194 } else {
1195 foundTypeVariables = List.nil();
1196 }
1197 }
1199 // See java.lang.Class
1200 private Name simpleBinaryName(Name self, Name enclosing) {
1201 String simpleBinaryName = self.toString().substring(enclosing.toString().length());
1202 if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$')
1203 throw badClassFile("bad.enclosing.method", self);
1204 int index = 1;
1205 while (index < simpleBinaryName.length() &&
1206 isAsciiDigit(simpleBinaryName.charAt(index)))
1207 index++;
1208 return names.fromString(simpleBinaryName.substring(index));
1209 }
1211 private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) {
1212 if (nt == null)
1213 return null;
1215 MethodType type = nt.type.asMethodType();
1217 for (Scope.Entry e = scope.lookup(nt.name); e.scope != null; e = e.next())
1218 if (e.sym.kind == MTH && isSameBinaryType(e.sym.type.asMethodType(), type))
1219 return (MethodSymbol)e.sym;
1221 if (nt.name != names.init)
1222 // not a constructor
1223 return null;
1224 if ((flags & INTERFACE) != 0)
1225 // no enclosing instance
1226 return null;
1227 if (nt.type.getParameterTypes().isEmpty())
1228 // no parameters
1229 return null;
1231 // A constructor of an inner class.
1232 // Remove the first argument (the enclosing instance)
1233 nt.type = new MethodType(nt.type.getParameterTypes().tail,
1234 nt.type.getReturnType(),
1235 nt.type.getThrownTypes(),
1236 syms.methodClass);
1237 // Try searching again
1238 return findMethod(nt, scope, flags);
1239 }
1241 /** Similar to Types.isSameType but avoids completion */
1242 private boolean isSameBinaryType(MethodType mt1, MethodType mt2) {
1243 List<Type> types1 = types.erasure(mt1.getParameterTypes())
1244 .prepend(types.erasure(mt1.getReturnType()));
1245 List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType());
1246 while (!types1.isEmpty() && !types2.isEmpty()) {
1247 if (types1.head.tsym != types2.head.tsym)
1248 return false;
1249 types1 = types1.tail;
1250 types2 = types2.tail;
1251 }
1252 return types1.isEmpty() && types2.isEmpty();
1253 }
1255 /**
1256 * Character.isDigit answers <tt>true</tt> to some non-ascii
1257 * digits. This one does not. <b>copied from java.lang.Class</b>
1258 */
1259 private static boolean isAsciiDigit(char c) {
1260 return '0' <= c && c <= '9';
1261 }
1263 /** Read member attributes.
1264 */
1265 void readMemberAttrs(Symbol sym) {
1266 readAttrs(sym, AttributeKind.MEMBER);
1267 }
1269 void readAttrs(Symbol sym, AttributeKind kind) {
1270 char ac = nextChar();
1271 for (int i = 0; i < ac; i++) {
1272 Name attrName = readName(nextChar());
1273 int attrLen = nextInt();
1274 AttributeReader r = attributeReaders.get(attrName);
1275 if (r != null && r.accepts(kind))
1276 r.read(sym, attrLen);
1277 else {
1278 unrecognized(attrName);
1279 bp = bp + attrLen;
1280 }
1281 }
1282 }
1284 private boolean readingClassAttr = false;
1285 private List<Type> missingTypeVariables = List.nil();
1286 private List<Type> foundTypeVariables = List.nil();
1288 /** Read class attributes.
1289 */
1290 void readClassAttrs(ClassSymbol c) {
1291 readAttrs(c, AttributeKind.CLASS);
1292 }
1294 /** Read code block.
1295 */
1296 Code readCode(Symbol owner) {
1297 nextChar(); // max_stack
1298 nextChar(); // max_locals
1299 final int code_length = nextInt();
1300 bp += code_length;
1301 final char exception_table_length = nextChar();
1302 bp += exception_table_length * 8;
1303 readMemberAttrs(owner);
1304 return null;
1305 }
1307 /************************************************************************
1308 * Reading Java-language annotations
1309 ***********************************************************************/
1311 /** Attach annotations.
1312 */
1313 void attachAnnotations(final Symbol sym) {
1314 int numAttributes = nextChar();
1315 if (numAttributes != 0) {
1316 ListBuffer<CompoundAnnotationProxy> proxies =
1317 new ListBuffer<CompoundAnnotationProxy>();
1318 for (int i = 0; i<numAttributes; i++) {
1319 CompoundAnnotationProxy proxy = readCompoundAnnotation();
1320 if (proxy.type.tsym == syms.proprietaryType.tsym)
1321 sym.flags_field |= PROPRIETARY;
1322 else
1323 proxies.append(proxy);
1324 if (majorVersion >= V51.major && proxy.type.tsym == syms.polymorphicSignatureType.tsym) {
1325 sym.flags_field |= POLYMORPHIC_SIGNATURE;
1326 }
1327 }
1328 annotate.later(new AnnotationCompleter(sym, proxies.toList()));
1329 }
1330 }
1332 /** Attach parameter annotations.
1333 */
1334 void attachParameterAnnotations(final Symbol method) {
1335 final MethodSymbol meth = (MethodSymbol)method;
1336 int numParameters = buf[bp++] & 0xFF;
1337 List<VarSymbol> parameters = meth.params();
1338 int pnum = 0;
1339 while (parameters.tail != null) {
1340 attachAnnotations(parameters.head);
1341 parameters = parameters.tail;
1342 pnum++;
1343 }
1344 if (pnum != numParameters) {
1345 throw badClassFile("bad.runtime.invisible.param.annotations", meth);
1346 }
1347 }
1349 /** Attach the default value for an annotation element.
1350 */
1351 void attachAnnotationDefault(final Symbol sym) {
1352 final MethodSymbol meth = (MethodSymbol)sym; // only on methods
1353 final Attribute value = readAttributeValue();
1354 annotate.later(new AnnotationDefaultCompleter(meth, value));
1355 }
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 enterClass(readName(i)).type;
1369 return readType(i);
1370 }
1372 CompoundAnnotationProxy readCompoundAnnotation() {
1373 Type t = readTypeOrClassSymbol(nextChar());
1374 int numFields = nextChar();
1375 ListBuffer<Pair<Name,Attribute>> pairs =
1376 new ListBuffer<Pair<Name,Attribute>>();
1377 for (int i=0; i<numFields; i++) {
1378 Name name = readName(nextChar());
1379 Attribute value = readAttributeValue();
1380 pairs.append(new Pair<Name,Attribute>(name, value));
1381 }
1382 return new CompoundAnnotationProxy(t, pairs.toList());
1383 }
1385 Attribute readAttributeValue() {
1386 char c = (char) buf[bp++];
1387 switch (c) {
1388 case 'B':
1389 return new Attribute.Constant(syms.byteType, readPool(nextChar()));
1390 case 'C':
1391 return new Attribute.Constant(syms.charType, readPool(nextChar()));
1392 case 'D':
1393 return new Attribute.Constant(syms.doubleType, readPool(nextChar()));
1394 case 'F':
1395 return new Attribute.Constant(syms.floatType, readPool(nextChar()));
1396 case 'I':
1397 return new Attribute.Constant(syms.intType, readPool(nextChar()));
1398 case 'J':
1399 return new Attribute.Constant(syms.longType, readPool(nextChar()));
1400 case 'S':
1401 return new Attribute.Constant(syms.shortType, readPool(nextChar()));
1402 case 'Z':
1403 return new Attribute.Constant(syms.booleanType, readPool(nextChar()));
1404 case 's':
1405 return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString());
1406 case 'e':
1407 return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar()));
1408 case 'c':
1409 return new Attribute.Class(types, readTypeOrClassSymbol(nextChar()));
1410 case '[': {
1411 int n = nextChar();
1412 ListBuffer<Attribute> l = new ListBuffer<Attribute>();
1413 for (int i=0; i<n; i++)
1414 l.append(readAttributeValue());
1415 return new ArrayAttributeProxy(l.toList());
1416 }
1417 case '@':
1418 return readCompoundAnnotation();
1419 default:
1420 throw new AssertionError("unknown annotation tag '" + c + "'");
1421 }
1422 }
1424 interface ProxyVisitor extends Attribute.Visitor {
1425 void visitEnumAttributeProxy(EnumAttributeProxy proxy);
1426 void visitArrayAttributeProxy(ArrayAttributeProxy proxy);
1427 void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy);
1428 }
1430 static class EnumAttributeProxy extends Attribute {
1431 Type enumType;
1432 Name enumerator;
1433 public EnumAttributeProxy(Type enumType, Name enumerator) {
1434 super(null);
1435 this.enumType = enumType;
1436 this.enumerator = enumerator;
1437 }
1438 public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); }
1439 @Override
1440 public String toString() {
1441 return "/*proxy enum*/" + enumType + "." + enumerator;
1442 }
1443 }
1445 static class ArrayAttributeProxy extends Attribute {
1446 List<Attribute> values;
1447 ArrayAttributeProxy(List<Attribute> values) {
1448 super(null);
1449 this.values = values;
1450 }
1451 public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); }
1452 @Override
1453 public String toString() {
1454 return "{" + values + "}";
1455 }
1456 }
1458 /** A temporary proxy representing a compound attribute.
1459 */
1460 static class CompoundAnnotationProxy extends Attribute {
1461 final List<Pair<Name,Attribute>> values;
1462 public CompoundAnnotationProxy(Type type,
1463 List<Pair<Name,Attribute>> values) {
1464 super(type);
1465 this.values = values;
1466 }
1467 public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); }
1468 @Override
1469 public String toString() {
1470 StringBuilder buf = new StringBuilder();
1471 buf.append("@");
1472 buf.append(type.tsym.getQualifiedName());
1473 buf.append("/*proxy*/{");
1474 boolean first = true;
1475 for (List<Pair<Name,Attribute>> v = values;
1476 v.nonEmpty(); v = v.tail) {
1477 Pair<Name,Attribute> value = v.head;
1478 if (!first) buf.append(",");
1479 first = false;
1480 buf.append(value.fst);
1481 buf.append("=");
1482 buf.append(value.snd);
1483 }
1484 buf.append("}");
1485 return buf.toString();
1486 }
1487 }
1489 /** A temporary proxy representing a type annotation.
1490 */
1491 static class TypeAnnotationProxy {
1492 final CompoundAnnotationProxy compound;
1493 final TypeAnnotationPosition position;
1494 public TypeAnnotationProxy(CompoundAnnotationProxy compound,
1495 TypeAnnotationPosition position) {
1496 this.compound = compound;
1497 this.position = position;
1498 }
1499 }
1501 class AnnotationDeproxy implements ProxyVisitor {
1502 private ClassSymbol requestingOwner = currentOwner.kind == MTH
1503 ? currentOwner.enclClass() : (ClassSymbol)currentOwner;
1505 List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) {
1506 // also must fill in types!!!!
1507 ListBuffer<Attribute.Compound> buf =
1508 new ListBuffer<Attribute.Compound>();
1509 for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) {
1510 buf.append(deproxyCompound(l.head));
1511 }
1512 return buf.toList();
1513 }
1515 Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) {
1516 ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf =
1517 new ListBuffer<Pair<Symbol.MethodSymbol,Attribute>>();
1518 for (List<Pair<Name,Attribute>> l = a.values;
1519 l.nonEmpty();
1520 l = l.tail) {
1521 MethodSymbol meth = findAccessMethod(a.type, l.head.fst);
1522 buf.append(new Pair<Symbol.MethodSymbol,Attribute>
1523 (meth, deproxy(meth.type.getReturnType(), l.head.snd)));
1524 }
1525 return new Attribute.Compound(a.type, buf.toList());
1526 }
1528 MethodSymbol findAccessMethod(Type container, Name name) {
1529 CompletionFailure failure = null;
1530 try {
1531 for (Scope.Entry e = container.tsym.members().lookup(name);
1532 e.scope != null;
1533 e = e.next()) {
1534 Symbol sym = e.sym;
1535 if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0)
1536 return (MethodSymbol) sym;
1537 }
1538 } catch (CompletionFailure ex) {
1539 failure = ex;
1540 }
1541 // The method wasn't found: emit a warning and recover
1542 JavaFileObject prevSource = log.useSource(requestingOwner.classfile);
1543 try {
1544 if (failure == null) {
1545 log.warning("annotation.method.not.found",
1546 container,
1547 name);
1548 } else {
1549 log.warning("annotation.method.not.found.reason",
1550 container,
1551 name,
1552 failure.getDetailValue());//diagnostic, if present
1553 }
1554 } finally {
1555 log.useSource(prevSource);
1556 }
1557 // Construct a new method type and symbol. Use bottom
1558 // type (typeof null) as return type because this type is
1559 // a subtype of all reference types and can be converted
1560 // to primitive types by unboxing.
1561 MethodType mt = new MethodType(List.<Type>nil(),
1562 syms.botType,
1563 List.<Type>nil(),
1564 syms.methodClass);
1565 return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym);
1566 }
1568 Attribute result;
1569 Type type;
1570 Attribute deproxy(Type t, Attribute a) {
1571 Type oldType = type;
1572 try {
1573 type = t;
1574 a.accept(this);
1575 return result;
1576 } finally {
1577 type = oldType;
1578 }
1579 }
1581 // implement Attribute.Visitor below
1583 public void visitConstant(Attribute.Constant value) {
1584 // assert value.type == type;
1585 result = value;
1586 }
1588 public void visitClass(Attribute.Class clazz) {
1589 result = clazz;
1590 }
1592 public void visitEnum(Attribute.Enum e) {
1593 throw new AssertionError(); // shouldn't happen
1594 }
1596 public void visitCompound(Attribute.Compound compound) {
1597 throw new AssertionError(); // shouldn't happen
1598 }
1600 public void visitArray(Attribute.Array array) {
1601 throw new AssertionError(); // shouldn't happen
1602 }
1604 public void visitError(Attribute.Error e) {
1605 throw new AssertionError(); // shouldn't happen
1606 }
1608 public void visitEnumAttributeProxy(EnumAttributeProxy proxy) {
1609 // type.tsym.flatName() should == proxy.enumFlatName
1610 TypeSymbol enumTypeSym = proxy.enumType.tsym;
1611 VarSymbol enumerator = null;
1612 for (Scope.Entry e = enumTypeSym.members().lookup(proxy.enumerator);
1613 e.scope != null;
1614 e = e.next()) {
1615 if (e.sym.kind == VAR) {
1616 enumerator = (VarSymbol)e.sym;
1617 break;
1618 }
1619 }
1620 if (enumerator == null) {
1621 log.error("unknown.enum.constant",
1622 currentClassFile, enumTypeSym, proxy.enumerator);
1623 result = new Attribute.Error(enumTypeSym.type);
1624 } else {
1625 result = new Attribute.Enum(enumTypeSym.type, enumerator);
1626 }
1627 }
1629 public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) {
1630 int length = proxy.values.length();
1631 Attribute[] ats = new Attribute[length];
1632 Type elemtype = types.elemtype(type);
1633 int i = 0;
1634 for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) {
1635 ats[i++] = deproxy(elemtype, p.head);
1636 }
1637 result = new Attribute.Array(type, ats);
1638 }
1640 public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) {
1641 result = deproxyCompound(proxy);
1642 }
1643 }
1645 class AnnotationDefaultCompleter extends AnnotationDeproxy implements Annotate.Annotator {
1646 final MethodSymbol sym;
1647 final Attribute value;
1648 final JavaFileObject classFile = currentClassFile;
1649 @Override
1650 public String toString() {
1651 return " ClassReader store default for " + sym.owner + "." + sym + " is " + value;
1652 }
1653 AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) {
1654 this.sym = sym;
1655 this.value = value;
1656 }
1657 // implement Annotate.Annotator.enterAnnotation()
1658 public void enterAnnotation() {
1659 JavaFileObject previousClassFile = currentClassFile;
1660 try {
1661 currentClassFile = classFile;
1662 sym.defaultValue = deproxy(sym.type.getReturnType(), value);
1663 } finally {
1664 currentClassFile = previousClassFile;
1665 }
1666 }
1667 }
1669 class AnnotationCompleter extends AnnotationDeproxy implements Annotate.Annotator {
1670 final Symbol sym;
1671 final List<CompoundAnnotationProxy> l;
1672 final JavaFileObject classFile;
1673 @Override
1674 public String toString() {
1675 return " ClassReader annotate " + sym.owner + "." + sym + " with " + l;
1676 }
1677 AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) {
1678 this.sym = sym;
1679 this.l = l;
1680 this.classFile = currentClassFile;
1681 }
1682 // implement Annotate.Annotator.enterAnnotation()
1683 public void enterAnnotation() {
1684 JavaFileObject previousClassFile = currentClassFile;
1685 try {
1686 currentClassFile = classFile;
1687 List<Attribute.Compound> newList = deproxyCompoundList(l);
1688 sym.attributes_field = ((sym.attributes_field == null)
1689 ? newList
1690 : newList.prependList(sym.attributes_field));
1691 } finally {
1692 currentClassFile = previousClassFile;
1693 }
1694 }
1695 }
1698 /************************************************************************
1699 * Reading Symbols
1700 ***********************************************************************/
1702 /** Read a field.
1703 */
1704 VarSymbol readField() {
1705 long flags = adjustFieldFlags(nextChar());
1706 Name name = readName(nextChar());
1707 Type type = readType(nextChar());
1708 VarSymbol v = new VarSymbol(flags, name, type, currentOwner);
1709 readMemberAttrs(v);
1710 return v;
1711 }
1713 /** Read a method.
1714 */
1715 MethodSymbol readMethod() {
1716 long flags = adjustMethodFlags(nextChar());
1717 Name name = readName(nextChar());
1718 Type type = readType(nextChar());
1719 if (name == names.init && currentOwner.hasOuterInstance()) {
1720 // Sometimes anonymous classes don't have an outer
1721 // instance, however, there is no reliable way to tell so
1722 // we never strip this$n
1723 if (!currentOwner.name.isEmpty())
1724 type = new MethodType(adjustMethodParams(flags, type.getParameterTypes()),
1725 type.getReturnType(),
1726 type.getThrownTypes(),
1727 syms.methodClass);
1728 }
1729 MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner);
1730 if (saveParameterNames)
1731 initParameterNames(m);
1732 Symbol prevOwner = currentOwner;
1733 currentOwner = m;
1734 try {
1735 readMemberAttrs(m);
1736 } finally {
1737 currentOwner = prevOwner;
1738 }
1739 if (saveParameterNames)
1740 setParameterNames(m, type);
1741 return m;
1742 }
1744 private List<Type> adjustMethodParams(long flags, List<Type> args) {
1745 boolean isVarargs = (flags & VARARGS) != 0;
1746 if (isVarargs) {
1747 Type varargsElem = args.last();
1748 ListBuffer<Type> adjustedArgs = ListBuffer.lb();
1749 for (Type t : args) {
1750 adjustedArgs.append(t != varargsElem ?
1751 t :
1752 ((ArrayType)t).makeVarargs());
1753 }
1754 args = adjustedArgs.toList();
1755 }
1756 return args.tail;
1757 }
1759 /**
1760 * Init the parameter names array.
1761 * Parameter names are currently inferred from the names in the
1762 * LocalVariableTable attributes of a Code attribute.
1763 * (Note: this means parameter names are currently not available for
1764 * methods without a Code attribute.)
1765 * This method initializes an array in which to store the name indexes
1766 * of parameter names found in LocalVariableTable attributes. It is
1767 * slightly supersized to allow for additional slots with a start_pc of 0.
1768 */
1769 void initParameterNames(MethodSymbol sym) {
1770 // make allowance for synthetic parameters.
1771 final int excessSlots = 4;
1772 int expectedParameterSlots =
1773 Code.width(sym.type.getParameterTypes()) + excessSlots;
1774 if (parameterNameIndices == null
1775 || parameterNameIndices.length < expectedParameterSlots) {
1776 parameterNameIndices = new int[expectedParameterSlots];
1777 } else
1778 Arrays.fill(parameterNameIndices, 0);
1779 haveParameterNameIndices = false;
1780 }
1782 /**
1783 * Set the parameter names for a symbol from the name index in the
1784 * parameterNameIndicies array. The type of the symbol may have changed
1785 * while reading the method attributes (see the Signature attribute).
1786 * This may be because of generic information or because anonymous
1787 * synthetic parameters were added. The original type (as read from
1788 * the method descriptor) is used to help guess the existence of
1789 * anonymous synthetic parameters.
1790 * On completion, sym.savedParameter names will either be null (if
1791 * no parameter names were found in the class file) or will be set to a
1792 * list of names, one per entry in sym.type.getParameterTypes, with
1793 * any missing names represented by the empty name.
1794 */
1795 void setParameterNames(MethodSymbol sym, Type jvmType) {
1796 // if no names were found in the class file, there's nothing more to do
1797 if (!haveParameterNameIndices)
1798 return;
1800 int firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0;
1801 // the code in readMethod may have skipped the first parameter when
1802 // setting up the MethodType. If so, we make a corresponding allowance
1803 // here for the position of the first parameter. Note that this
1804 // assumes the skipped parameter has a width of 1 -- i.e. it is not
1805 // a double width type (long or double.)
1806 if (sym.name == names.init && currentOwner.hasOuterInstance()) {
1807 // Sometimes anonymous classes don't have an outer
1808 // instance, however, there is no reliable way to tell so
1809 // we never strip this$n
1810 if (!currentOwner.name.isEmpty())
1811 firstParam += 1;
1812 }
1814 if (sym.type != jvmType) {
1815 // reading the method attributes has caused the symbol's type to
1816 // be changed. (i.e. the Signature attribute.) This may happen if
1817 // there are hidden (synthetic) parameters in the descriptor, but
1818 // not in the Signature. The position of these hidden parameters
1819 // is unspecified; for now, assume they are at the beginning, and
1820 // so skip over them. The primary case for this is two hidden
1821 // parameters passed into Enum constructors.
1822 int skip = Code.width(jvmType.getParameterTypes())
1823 - Code.width(sym.type.getParameterTypes());
1824 firstParam += skip;
1825 }
1826 List<Name> paramNames = List.nil();
1827 int index = firstParam;
1828 for (Type t: sym.type.getParameterTypes()) {
1829 int nameIdx = (index < parameterNameIndices.length
1830 ? parameterNameIndices[index] : 0);
1831 Name name = nameIdx == 0 ? names.empty : readName(nameIdx);
1832 paramNames = paramNames.prepend(name);
1833 index += Code.width(t);
1834 }
1835 sym.savedParameterNames = paramNames.reverse();
1836 }
1838 /**
1839 * skip n bytes
1840 */
1841 void skipBytes(int n) {
1842 bp = bp + n;
1843 }
1845 /** Skip a field or method
1846 */
1847 void skipMember() {
1848 bp = bp + 6;
1849 char ac = nextChar();
1850 for (int i = 0; i < ac; i++) {
1851 bp = bp + 2;
1852 int attrLen = nextInt();
1853 bp = bp + attrLen;
1854 }
1855 }
1857 /** Enter type variables of this classtype and all enclosing ones in
1858 * `typevars'.
1859 */
1860 protected void enterTypevars(Type t) {
1861 if (t.getEnclosingType() != null && t.getEnclosingType().tag == CLASS)
1862 enterTypevars(t.getEnclosingType());
1863 for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail)
1864 typevars.enter(xs.head.tsym);
1865 }
1867 protected void enterTypevars(Symbol sym) {
1868 if (sym.owner.kind == MTH) {
1869 enterTypevars(sym.owner);
1870 enterTypevars(sym.owner.owner);
1871 }
1872 enterTypevars(sym.type);
1873 }
1875 /** Read contents of a given class symbol `c'. Both external and internal
1876 * versions of an inner class are read.
1877 */
1878 void readClass(ClassSymbol c) {
1879 ClassType ct = (ClassType)c.type;
1881 // allocate scope for members
1882 c.members_field = new Scope.ClassScope(c, scopeCounter);
1884 // prepare type variable table
1885 typevars = typevars.dup(currentOwner);
1886 if (ct.getEnclosingType().tag == CLASS)
1887 enterTypevars(ct.getEnclosingType());
1889 // read flags, or skip if this is an inner class
1890 long flags = adjustClassFlags(nextChar());
1891 if (c.owner.kind == PCK) c.flags_field = flags;
1893 // read own class name and check that it matches
1894 ClassSymbol self = readClassSymbol(nextChar());
1895 if (c != self)
1896 throw badClassFile("class.file.wrong.class",
1897 self.flatname);
1899 // class attributes must be read before class
1900 // skip ahead to read class attributes
1901 int startbp = bp;
1902 nextChar();
1903 char interfaceCount = nextChar();
1904 bp += interfaceCount * 2;
1905 char fieldCount = nextChar();
1906 for (int i = 0; i < fieldCount; i++) skipMember();
1907 char methodCount = nextChar();
1908 for (int i = 0; i < methodCount; i++) skipMember();
1909 readClassAttrs(c);
1911 if (readAllOfClassFile) {
1912 for (int i = 1; i < poolObj.length; i++) readPool(i);
1913 c.pool = new Pool(poolObj.length, poolObj);
1914 }
1916 // reset and read rest of classinfo
1917 bp = startbp;
1918 int n = nextChar();
1919 if (ct.supertype_field == null)
1920 ct.supertype_field = (n == 0)
1921 ? Type.noType
1922 : readClassSymbol(n).erasure(types);
1923 n = nextChar();
1924 List<Type> is = List.nil();
1925 for (int i = 0; i < n; i++) {
1926 Type _inter = readClassSymbol(nextChar()).erasure(types);
1927 is = is.prepend(_inter);
1928 }
1929 if (ct.interfaces_field == null)
1930 ct.interfaces_field = is.reverse();
1932 Assert.check(fieldCount == nextChar());
1933 for (int i = 0; i < fieldCount; i++) enterMember(c, readField());
1934 Assert.check(methodCount == nextChar());
1935 for (int i = 0; i < methodCount; i++) enterMember(c, readMethod());
1937 typevars = typevars.leave();
1938 }
1940 /** Read inner class info. For each inner/outer pair allocate a
1941 * member class.
1942 */
1943 void readInnerClasses(ClassSymbol c) {
1944 int n = nextChar();
1945 for (int i = 0; i < n; i++) {
1946 nextChar(); // skip inner class symbol
1947 ClassSymbol outer = readClassSymbol(nextChar());
1948 Name name = readName(nextChar());
1949 if (name == null) name = names.empty;
1950 long flags = adjustClassFlags(nextChar());
1951 if (outer != null) { // we have a member class
1952 if (name == names.empty)
1953 name = names.one;
1954 ClassSymbol member = enterClass(name, outer);
1955 if ((flags & STATIC) == 0) {
1956 ((ClassType)member.type).setEnclosingType(outer.type);
1957 if (member.erasure_field != null)
1958 ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type));
1959 }
1960 if (c == outer) {
1961 member.flags_field = flags;
1962 enterMember(c, member);
1963 }
1964 }
1965 }
1966 }
1968 /** Read a class file.
1969 */
1970 private void readClassFile(ClassSymbol c) throws IOException {
1971 int magic = nextInt();
1972 if (magic != JAVA_MAGIC)
1973 throw badClassFile("illegal.start.of.class.file");
1975 minorVersion = nextChar();
1976 majorVersion = nextChar();
1977 int maxMajor = Target.MAX().majorVersion;
1978 int maxMinor = Target.MAX().minorVersion;
1979 if (majorVersion > maxMajor ||
1980 majorVersion * 1000 + minorVersion <
1981 Target.MIN().majorVersion * 1000 + Target.MIN().minorVersion)
1982 {
1983 if (majorVersion == (maxMajor + 1))
1984 log.warning("big.major.version",
1985 currentClassFile,
1986 majorVersion,
1987 maxMajor);
1988 else
1989 throw badClassFile("wrong.version",
1990 Integer.toString(majorVersion),
1991 Integer.toString(minorVersion),
1992 Integer.toString(maxMajor),
1993 Integer.toString(maxMinor));
1994 }
1995 else if (checkClassFile &&
1996 majorVersion == maxMajor &&
1997 minorVersion > maxMinor)
1998 {
1999 printCCF("found.later.version",
2000 Integer.toString(minorVersion));
2001 }
2002 indexPool();
2003 if (signatureBuffer.length < bp) {
2004 int ns = Integer.highestOneBit(bp) << 1;
2005 signatureBuffer = new byte[ns];
2006 }
2007 readClass(c);
2008 }
2010 /************************************************************************
2011 * Adjusting flags
2012 ***********************************************************************/
2014 long adjustFieldFlags(long flags) {
2015 return flags;
2016 }
2017 long adjustMethodFlags(long flags) {
2018 if ((flags & ACC_BRIDGE) != 0) {
2019 flags &= ~ACC_BRIDGE;
2020 flags |= BRIDGE;
2021 if (!allowGenerics)
2022 flags &= ~SYNTHETIC;
2023 }
2024 if ((flags & ACC_VARARGS) != 0) {
2025 flags &= ~ACC_VARARGS;
2026 flags |= VARARGS;
2027 }
2028 return flags;
2029 }
2030 long adjustClassFlags(long flags) {
2031 return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded
2032 }
2034 /************************************************************************
2035 * Loading Classes
2036 ***********************************************************************/
2038 /** Define a new class given its name and owner.
2039 */
2040 public ClassSymbol defineClass(Name name, Symbol owner) {
2041 ClassSymbol c = new ClassSymbol(0, name, owner);
2042 if (owner.kind == PCK)
2043 Assert.checkNull(classes.get(c.flatname), c);
2044 c.completer = this;
2045 return c;
2046 }
2048 /** Create a new toplevel or member class symbol with given name
2049 * and owner and enter in `classes' unless already there.
2050 */
2051 public ClassSymbol enterClass(Name name, TypeSymbol owner) {
2052 Name flatname = TypeSymbol.formFlatName(name, owner);
2053 ClassSymbol c = classes.get(flatname);
2054 if (c == null) {
2055 c = defineClass(name, owner);
2056 classes.put(flatname, c);
2057 } else if ((c.name != name || c.owner != owner) && owner.kind == TYP && c.owner.kind == PCK) {
2058 // reassign fields of classes that might have been loaded with
2059 // their flat names.
2060 c.owner.members().remove(c);
2061 c.name = name;
2062 c.owner = owner;
2063 c.fullname = ClassSymbol.formFullName(name, owner);
2064 }
2065 return c;
2066 }
2068 /**
2069 * Creates a new toplevel class symbol with given flat name and
2070 * given class (or source) file.
2071 *
2072 * @param flatName a fully qualified binary class name
2073 * @param classFile the class file or compilation unit defining
2074 * the class (may be {@code null})
2075 * @return a newly created class symbol
2076 * @throws AssertionError if the class symbol already exists
2077 */
2078 public ClassSymbol enterClass(Name flatName, JavaFileObject classFile) {
2079 ClassSymbol cs = classes.get(flatName);
2080 if (cs != null) {
2081 String msg = Log.format("%s: completer = %s; class file = %s; source file = %s",
2082 cs.fullname,
2083 cs.completer,
2084 cs.classfile,
2085 cs.sourcefile);
2086 throw new AssertionError(msg);
2087 }
2088 Name packageName = Convert.packagePart(flatName);
2089 PackageSymbol owner = packageName.isEmpty()
2090 ? syms.unnamedPackage
2091 : enterPackage(packageName);
2092 cs = defineClass(Convert.shortName(flatName), owner);
2093 cs.classfile = classFile;
2094 classes.put(flatName, cs);
2095 return cs;
2096 }
2098 /** Create a new member or toplevel class symbol with given flat name
2099 * and enter in `classes' unless already there.
2100 */
2101 public ClassSymbol enterClass(Name flatname) {
2102 ClassSymbol c = classes.get(flatname);
2103 if (c == null)
2104 return enterClass(flatname, (JavaFileObject)null);
2105 else
2106 return c;
2107 }
2109 private boolean suppressFlush = false;
2111 /** Completion for classes to be loaded. Before a class is loaded
2112 * we make sure its enclosing class (if any) is loaded.
2113 */
2114 public void complete(Symbol sym) throws CompletionFailure {
2115 if (sym.kind == TYP) {
2116 ClassSymbol c = (ClassSymbol)sym;
2117 c.members_field = new Scope.ErrorScope(c); // make sure it's always defined
2118 boolean saveSuppressFlush = suppressFlush;
2119 suppressFlush = true;
2120 try {
2121 completeOwners(c.owner);
2122 completeEnclosing(c);
2123 } finally {
2124 suppressFlush = saveSuppressFlush;
2125 }
2126 fillIn(c);
2127 } else if (sym.kind == PCK) {
2128 PackageSymbol p = (PackageSymbol)sym;
2129 try {
2130 fillIn(p);
2131 } catch (IOException ex) {
2132 throw new CompletionFailure(sym, ex.getLocalizedMessage()).initCause(ex);
2133 }
2134 }
2135 if (!filling && !suppressFlush)
2136 annotate.flush(); // finish attaching annotations
2137 }
2139 /** complete up through the enclosing package. */
2140 private void completeOwners(Symbol o) {
2141 if (o.kind != PCK) completeOwners(o.owner);
2142 o.complete();
2143 }
2145 /**
2146 * Tries to complete lexically enclosing classes if c looks like a
2147 * nested class. This is similar to completeOwners but handles
2148 * the situation when a nested class is accessed directly as it is
2149 * possible with the Tree API or javax.lang.model.*.
2150 */
2151 private void completeEnclosing(ClassSymbol c) {
2152 if (c.owner.kind == PCK) {
2153 Symbol owner = c.owner;
2154 for (Name name : Convert.enclosingCandidates(Convert.shortName(c.name))) {
2155 Symbol encl = owner.members().lookup(name).sym;
2156 if (encl == null)
2157 encl = classes.get(TypeSymbol.formFlatName(name, owner));
2158 if (encl != null)
2159 encl.complete();
2160 }
2161 }
2162 }
2164 /** We can only read a single class file at a time; this
2165 * flag keeps track of when we are currently reading a class
2166 * file.
2167 */
2168 private boolean filling = false;
2170 /** Fill in definition of class `c' from corresponding class or
2171 * source file.
2172 */
2173 private void fillIn(ClassSymbol c) {
2174 if (completionFailureName == c.fullname) {
2175 throw new CompletionFailure(c, "user-selected completion failure by class name");
2176 }
2177 currentOwner = c;
2178 warnedAttrs.clear();
2179 JavaFileObject classfile = c.classfile;
2180 if (classfile != null) {
2181 JavaFileObject previousClassFile = currentClassFile;
2182 try {
2183 if (filling) {
2184 Assert.error("Filling " + classfile.toUri() + " during " + previousClassFile);
2185 }
2186 currentClassFile = classfile;
2187 if (verbose) {
2188 printVerbose("loading", currentClassFile.toString());
2189 }
2190 if (classfile.getKind() == JavaFileObject.Kind.CLASS) {
2191 filling = true;
2192 try {
2193 bp = 0;
2194 buf = readInputStream(buf, classfile.openInputStream());
2195 readClassFile(c);
2196 if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) {
2197 List<Type> missing = missingTypeVariables;
2198 List<Type> found = foundTypeVariables;
2199 missingTypeVariables = List.nil();
2200 foundTypeVariables = List.nil();
2201 filling = false;
2202 ClassType ct = (ClassType)currentOwner.type;
2203 ct.supertype_field =
2204 types.subst(ct.supertype_field, missing, found);
2205 ct.interfaces_field =
2206 types.subst(ct.interfaces_field, missing, found);
2207 } else if (missingTypeVariables.isEmpty() !=
2208 foundTypeVariables.isEmpty()) {
2209 Name name = missingTypeVariables.head.tsym.name;
2210 throw badClassFile("undecl.type.var", name);
2211 }
2212 } finally {
2213 missingTypeVariables = List.nil();
2214 foundTypeVariables = List.nil();
2215 filling = false;
2216 }
2217 } else {
2218 if (sourceCompleter != null) {
2219 sourceCompleter.complete(c);
2220 } else {
2221 throw new IllegalStateException("Source completer required to read "
2222 + classfile.toUri());
2223 }
2224 }
2225 return;
2226 } catch (IOException ex) {
2227 throw badClassFile("unable.to.access.file", ex.getMessage());
2228 } finally {
2229 currentClassFile = previousClassFile;
2230 }
2231 } else {
2232 JCDiagnostic diag =
2233 diagFactory.fragment("class.file.not.found", c.flatname);
2234 throw
2235 newCompletionFailure(c, diag);
2236 }
2237 }
2238 // where
2239 private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException {
2240 try {
2241 buf = ensureCapacity(buf, s.available());
2242 int r = s.read(buf);
2243 int bp = 0;
2244 while (r != -1) {
2245 bp += r;
2246 buf = ensureCapacity(buf, bp);
2247 r = s.read(buf, bp, buf.length - bp);
2248 }
2249 return buf;
2250 } finally {
2251 try {
2252 s.close();
2253 } catch (IOException e) {
2254 /* Ignore any errors, as this stream may have already
2255 * thrown a related exception which is the one that
2256 * should be reported.
2257 */
2258 }
2259 }
2260 }
2261 /*
2262 * ensureCapacity will increase the buffer as needed, taking note that
2263 * the new buffer will always be greater than the needed and never
2264 * exactly equal to the needed size or bp. If equal then the read (above)
2265 * will infinitely loop as buf.length - bp == 0.
2266 */
2267 private static byte[] ensureCapacity(byte[] buf, int needed) {
2268 if (buf.length <= needed) {
2269 byte[] old = buf;
2270 buf = new byte[Integer.highestOneBit(needed) << 1];
2271 System.arraycopy(old, 0, buf, 0, old.length);
2272 }
2273 return buf;
2274 }
2275 /** Static factory for CompletionFailure objects.
2276 * In practice, only one can be used at a time, so we share one
2277 * to reduce the expense of allocating new exception objects.
2278 */
2279 private CompletionFailure newCompletionFailure(TypeSymbol c,
2280 JCDiagnostic diag) {
2281 if (!cacheCompletionFailure) {
2282 // log.warning("proc.messager",
2283 // Log.getLocalizedString("class.file.not.found", c.flatname));
2284 // c.debug.printStackTrace();
2285 return new CompletionFailure(c, diag);
2286 } else {
2287 CompletionFailure result = cachedCompletionFailure;
2288 result.sym = c;
2289 result.diag = diag;
2290 return result;
2291 }
2292 }
2293 private CompletionFailure cachedCompletionFailure =
2294 new CompletionFailure(null, (JCDiagnostic) null);
2295 {
2296 cachedCompletionFailure.setStackTrace(new StackTraceElement[0]);
2297 }
2299 /** Load a toplevel class with given fully qualified name
2300 * The class is entered into `classes' only if load was successful.
2301 */
2302 public ClassSymbol loadClass(Name flatname) throws CompletionFailure {
2303 boolean absent = classes.get(flatname) == null;
2304 ClassSymbol c = enterClass(flatname);
2305 if (c.members_field == null && c.completer != null) {
2306 try {
2307 c.complete();
2308 } catch (CompletionFailure ex) {
2309 if (absent) classes.remove(flatname);
2310 throw ex;
2311 }
2312 }
2313 return c;
2314 }
2316 /************************************************************************
2317 * Loading Packages
2318 ***********************************************************************/
2320 /** Check to see if a package exists, given its fully qualified name.
2321 */
2322 public boolean packageExists(Name fullname) {
2323 return enterPackage(fullname).exists();
2324 }
2326 /** Make a package, given its fully qualified name.
2327 */
2328 public PackageSymbol enterPackage(Name fullname) {
2329 PackageSymbol p = packages.get(fullname);
2330 if (p == null) {
2331 Assert.check(!fullname.isEmpty(), "rootPackage missing!");
2332 p = new PackageSymbol(
2333 Convert.shortName(fullname),
2334 enterPackage(Convert.packagePart(fullname)));
2335 p.completer = this;
2336 packages.put(fullname, p);
2337 }
2338 return p;
2339 }
2341 /** Make a package, given its unqualified name and enclosing package.
2342 */
2343 public PackageSymbol enterPackage(Name name, PackageSymbol owner) {
2344 return enterPackage(TypeSymbol.formFullName(name, owner));
2345 }
2347 /** Include class corresponding to given class file in package,
2348 * unless (1) we already have one the same kind (.class or .java), or
2349 * (2) we have one of the other kind, and the given class file
2350 * is older.
2351 */
2352 protected void includeClassFile(PackageSymbol p, JavaFileObject file) {
2353 if ((p.flags_field & EXISTS) == 0)
2354 for (Symbol q = p; q != null && q.kind == PCK; q = q.owner)
2355 q.flags_field |= EXISTS;
2356 JavaFileObject.Kind kind = file.getKind();
2357 int seen;
2358 if (kind == JavaFileObject.Kind.CLASS)
2359 seen = CLASS_SEEN;
2360 else
2361 seen = SOURCE_SEEN;
2362 String binaryName = fileManager.inferBinaryName(currentLoc, file);
2363 int lastDot = binaryName.lastIndexOf(".");
2364 Name classname = names.fromString(binaryName.substring(lastDot + 1));
2365 boolean isPkgInfo = classname == names.package_info;
2366 ClassSymbol c = isPkgInfo
2367 ? p.package_info
2368 : (ClassSymbol) p.members_field.lookup(classname).sym;
2369 if (c == null) {
2370 c = enterClass(classname, p);
2371 if (c.classfile == null) // only update the file if's it's newly created
2372 c.classfile = file;
2373 if (isPkgInfo) {
2374 p.package_info = c;
2375 } else {
2376 if (c.owner == p) // it might be an inner class
2377 p.members_field.enter(c);
2378 }
2379 } else if (c.classfile != null && (c.flags_field & seen) == 0) {
2380 // if c.classfile == null, we are currently compiling this class
2381 // and no further action is necessary.
2382 // if (c.flags_field & seen) != 0, we have already encountered
2383 // a file of the same kind; again no further action is necessary.
2384 if ((c.flags_field & (CLASS_SEEN | SOURCE_SEEN)) != 0)
2385 c.classfile = preferredFileObject(file, c.classfile);
2386 }
2387 c.flags_field |= seen;
2388 }
2390 /** Implement policy to choose to derive information from a source
2391 * file or a class file when both are present. May be overridden
2392 * by subclasses.
2393 */
2394 protected JavaFileObject preferredFileObject(JavaFileObject a,
2395 JavaFileObject b) {
2397 if (preferSource)
2398 return (a.getKind() == JavaFileObject.Kind.SOURCE) ? a : b;
2399 else {
2400 long adate = a.getLastModified();
2401 long bdate = b.getLastModified();
2402 // 6449326: policy for bad lastModifiedTime in ClassReader
2403 //assert adate >= 0 && bdate >= 0;
2404 return (adate > bdate) ? a : b;
2405 }
2406 }
2408 /**
2409 * specifies types of files to be read when filling in a package symbol
2410 */
2411 protected EnumSet<JavaFileObject.Kind> getPackageFileKinds() {
2412 return EnumSet.of(JavaFileObject.Kind.CLASS, JavaFileObject.Kind.SOURCE);
2413 }
2415 /**
2416 * this is used to support javadoc
2417 */
2418 protected void extraFileActions(PackageSymbol pack, JavaFileObject fe) {
2419 }
2421 protected Location currentLoc; // FIXME
2423 private boolean verbosePath = true;
2425 /** Load directory of package into members scope.
2426 */
2427 private void fillIn(PackageSymbol p) throws IOException {
2428 if (p.members_field == null) p.members_field = new Scope(p);
2429 String packageName = p.fullname.toString();
2431 Set<JavaFileObject.Kind> kinds = getPackageFileKinds();
2433 fillIn(p, PLATFORM_CLASS_PATH,
2434 fileManager.list(PLATFORM_CLASS_PATH,
2435 packageName,
2436 EnumSet.of(JavaFileObject.Kind.CLASS),
2437 false));
2439 Set<JavaFileObject.Kind> classKinds = EnumSet.copyOf(kinds);
2440 classKinds.remove(JavaFileObject.Kind.SOURCE);
2441 boolean wantClassFiles = !classKinds.isEmpty();
2443 Set<JavaFileObject.Kind> sourceKinds = EnumSet.copyOf(kinds);
2444 sourceKinds.remove(JavaFileObject.Kind.CLASS);
2445 boolean wantSourceFiles = !sourceKinds.isEmpty();
2447 boolean haveSourcePath = fileManager.hasLocation(SOURCE_PATH);
2449 if (verbose && verbosePath) {
2450 if (fileManager instanceof StandardJavaFileManager) {
2451 StandardJavaFileManager fm = (StandardJavaFileManager)fileManager;
2452 if (haveSourcePath && wantSourceFiles) {
2453 List<File> path = List.nil();
2454 for (File file : fm.getLocation(SOURCE_PATH)) {
2455 path = path.prepend(file);
2456 }
2457 printVerbose("sourcepath", path.reverse().toString());
2458 } else if (wantSourceFiles) {
2459 List<File> path = List.nil();
2460 for (File file : fm.getLocation(CLASS_PATH)) {
2461 path = path.prepend(file);
2462 }
2463 printVerbose("sourcepath", path.reverse().toString());
2464 }
2465 if (wantClassFiles) {
2466 List<File> path = List.nil();
2467 for (File file : fm.getLocation(PLATFORM_CLASS_PATH)) {
2468 path = path.prepend(file);
2469 }
2470 for (File file : fm.getLocation(CLASS_PATH)) {
2471 path = path.prepend(file);
2472 }
2473 printVerbose("classpath", path.reverse().toString());
2474 }
2475 }
2476 }
2478 if (wantSourceFiles && !haveSourcePath) {
2479 fillIn(p, CLASS_PATH,
2480 fileManager.list(CLASS_PATH,
2481 packageName,
2482 kinds,
2483 false));
2484 } else {
2485 if (wantClassFiles)
2486 fillIn(p, CLASS_PATH,
2487 fileManager.list(CLASS_PATH,
2488 packageName,
2489 classKinds,
2490 false));
2491 if (wantSourceFiles)
2492 fillIn(p, SOURCE_PATH,
2493 fileManager.list(SOURCE_PATH,
2494 packageName,
2495 sourceKinds,
2496 false));
2497 }
2498 verbosePath = false;
2499 }
2500 // where
2501 private void fillIn(PackageSymbol p,
2502 Location location,
2503 Iterable<JavaFileObject> files)
2504 {
2505 currentLoc = location;
2506 for (JavaFileObject fo : files) {
2507 switch (fo.getKind()) {
2508 case CLASS:
2509 case SOURCE: {
2510 // TODO pass binaryName to includeClassFile
2511 String binaryName = fileManager.inferBinaryName(currentLoc, fo);
2512 String simpleName = binaryName.substring(binaryName.lastIndexOf(".") + 1);
2513 if (SourceVersion.isIdentifier(simpleName) ||
2514 simpleName.equals("package-info"))
2515 includeClassFile(p, fo);
2516 break;
2517 }
2518 default:
2519 extraFileActions(p, fo);
2520 }
2521 }
2522 }
2524 /** Output for "-verbose" option.
2525 * @param key The key to look up the correct internationalized string.
2526 * @param arg An argument for substitution into the output string.
2527 */
2528 private void printVerbose(String key, CharSequence arg) {
2529 log.printNoteLines("verbose." + key, arg);
2530 }
2532 /** Output for "-checkclassfile" option.
2533 * @param key The key to look up the correct internationalized string.
2534 * @param arg An argument for substitution into the output string.
2535 */
2536 private void printCCF(String key, Object arg) {
2537 log.printNoteLines(key, arg);
2538 }
2541 public interface SourceCompleter {
2542 void complete(ClassSymbol sym)
2543 throws CompletionFailure;
2544 }
2546 /**
2547 * A subclass of JavaFileObject for the sourcefile attribute found in a classfile.
2548 * The attribute is only the last component of the original filename, so is unlikely
2549 * to be valid as is, so operations other than those to access the name throw
2550 * UnsupportedOperationException
2551 */
2552 private static class SourceFileObject extends BaseFileObject {
2554 /** The file's name.
2555 */
2556 private Name name;
2557 private Name flatname;
2559 public SourceFileObject(Name name, Name flatname) {
2560 super(null); // no file manager; never referenced for this file object
2561 this.name = name;
2562 this.flatname = flatname;
2563 }
2565 @Override
2566 public URI toUri() {
2567 try {
2568 return new URI(null, name.toString(), null);
2569 } catch (URISyntaxException e) {
2570 throw new CannotCreateUriError(name.toString(), e);
2571 }
2572 }
2574 @Override
2575 public String getName() {
2576 return name.toString();
2577 }
2579 @Override
2580 public String getShortName() {
2581 return getName();
2582 }
2584 @Override
2585 public JavaFileObject.Kind getKind() {
2586 return getKind(getName());
2587 }
2589 @Override
2590 public InputStream openInputStream() {
2591 throw new UnsupportedOperationException();
2592 }
2594 @Override
2595 public OutputStream openOutputStream() {
2596 throw new UnsupportedOperationException();
2597 }
2599 @Override
2600 public CharBuffer getCharContent(boolean ignoreEncodingErrors) {
2601 throw new UnsupportedOperationException();
2602 }
2604 @Override
2605 public Reader openReader(boolean ignoreEncodingErrors) {
2606 throw new UnsupportedOperationException();
2607 }
2609 @Override
2610 public Writer openWriter() {
2611 throw new UnsupportedOperationException();
2612 }
2614 @Override
2615 public long getLastModified() {
2616 throw new UnsupportedOperationException();
2617 }
2619 @Override
2620 public boolean delete() {
2621 throw new UnsupportedOperationException();
2622 }
2624 @Override
2625 protected String inferBinaryName(Iterable<? extends File> path) {
2626 return flatname.toString();
2627 }
2629 @Override
2630 public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) {
2631 return true; // fail-safe mode
2632 }
2634 /**
2635 * Check if two file objects are equal.
2636 * SourceFileObjects are just placeholder objects for the value of a
2637 * SourceFile attribute, and do not directly represent specific files.
2638 * Two SourceFileObjects are equal if their names are equal.
2639 */
2640 @Override
2641 public boolean equals(Object other) {
2642 if (this == other)
2643 return true;
2645 if (!(other instanceof SourceFileObject))
2646 return false;
2648 SourceFileObject o = (SourceFileObject) other;
2649 return name.equals(o.name);
2650 }
2652 @Override
2653 public int hashCode() {
2654 return name.hashCode();
2655 }
2656 }
2657 }
