Tue, 12 Feb 2013 17:15:29 -0800
8008077: update reference impl for type-annotations
Reviewed-by: jjg
Contributed-by: wmdietl@cs.washington.edu
1 /*
2 * Copyright (c) 1999, 2013, 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.util.LinkedHashMap;
30 import java.util.Map;
31 import java.util.Set;
32 import java.util.HashSet;
34 import javax.lang.model.type.TypeKind;
35 import javax.tools.JavaFileManager;
36 import javax.tools.FileObject;
37 import javax.tools.JavaFileObject;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
41 import com.sun.tools.javac.code.Attribute.TypeCompound;
42 import com.sun.tools.javac.code.Symbol.*;
43 import com.sun.tools.javac.code.Type.*;
44 import com.sun.tools.javac.code.Types.UniqueType;
45 import com.sun.tools.javac.file.BaseFileObject;
46 import com.sun.tools.javac.jvm.Pool.DynamicMethod;
47 import com.sun.tools.javac.jvm.Pool.Method;
48 import com.sun.tools.javac.jvm.Pool.MethodHandle;
49 import com.sun.tools.javac.jvm.Pool.Variable;
50 import com.sun.tools.javac.util.*;
52 import static com.sun.tools.javac.code.Flags.*;
53 import static com.sun.tools.javac.code.Kinds.*;
54 import static com.sun.tools.javac.code.TypeTag.*;
55 import static com.sun.tools.javac.jvm.UninitializedType.*;
56 import static com.sun.tools.javac.main.Option.*;
57 import static javax.tools.StandardLocation.CLASS_OUTPUT;
60 /** This class provides operations to map an internal symbol table graph
61 * rooted in a ClassSymbol into a classfile.
62 *
63 * <p><b>This is NOT part of any supported API.
64 * If you write code that depends on this, you do so at your own risk.
65 * This code and its internal interfaces are subject to change or
66 * deletion without notice.</b>
67 */
68 public class ClassWriter extends ClassFile {
69 protected static final Context.Key<ClassWriter> classWriterKey =
70 new Context.Key<ClassWriter>();
72 private final Options options;
74 /** Switch: verbose output.
75 */
76 private boolean verbose;
78 /** Switch: scramble private field names.
79 */
80 private boolean scramble;
82 /** Switch: scramble all field names.
83 */
84 private boolean scrambleAll;
86 /** Switch: retrofit mode.
87 */
88 private boolean retrofit;
90 /** Switch: emit source file attribute.
91 */
92 private boolean emitSourceFile;
94 /** Switch: generate CharacterRangeTable attribute.
95 */
96 private boolean genCrt;
98 /** Switch: describe the generated stackmap.
99 */
100 boolean debugstackmap;
102 /**
103 * Target class version.
104 */
105 private Target target;
107 /**
108 * Source language version.
109 */
110 private Source source;
112 /** Type utilities. */
113 private Types types;
115 /** The initial sizes of the data and constant pool buffers.
116 * Sizes are increased when buffers get full.
117 */
118 static final int DATA_BUF_SIZE = 0x0fff0;
119 static final int POOL_BUF_SIZE = 0x1fff0;
121 /** An output buffer for member info.
122 */
123 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
125 /** An output buffer for the constant pool.
126 */
127 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
129 /** An output buffer for type signatures.
130 */
131 ByteBuffer sigbuf = new ByteBuffer();
133 /** The constant pool.
134 */
135 Pool pool;
137 /** The inner classes to be written, as a set.
138 */
139 Set<ClassSymbol> innerClasses;
141 /** The inner classes to be written, as a queue where
142 * enclosing classes come first.
143 */
144 ListBuffer<ClassSymbol> innerClassesQueue;
146 /** The bootstrap methods to be written in the corresponding class attribute
147 * (one for each invokedynamic)
148 */
149 Map<DynamicMethod, MethodHandle> bootstrapMethods;
151 /** The log to use for verbose output.
152 */
153 private final Log log;
155 /** The name table. */
156 private final Names names;
158 /** Access to files. */
159 private final JavaFileManager fileManager;
161 /** The tags and constants used in compressed stackmap. */
162 static final int SAME_FRAME_SIZE = 64;
163 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
164 static final int SAME_FRAME_EXTENDED = 251;
165 static final int FULL_FRAME = 255;
166 static final int MAX_LOCAL_LENGTH_DIFF = 4;
168 /** Get the ClassWriter instance for this context. */
169 public static ClassWriter instance(Context context) {
170 ClassWriter instance = context.get(classWriterKey);
171 if (instance == null)
172 instance = new ClassWriter(context);
173 return instance;
174 }
176 /** Construct a class writer, given an options table.
177 */
178 protected ClassWriter(Context context) {
179 context.put(classWriterKey, this);
181 log = Log.instance(context);
182 names = Names.instance(context);
183 options = Options.instance(context);
184 target = Target.instance(context);
185 source = Source.instance(context);
186 types = Types.instance(context);
187 fileManager = context.get(JavaFileManager.class);
189 verbose = options.isSet(VERBOSE);
190 scramble = options.isSet("-scramble");
191 scrambleAll = options.isSet("-scrambleAll");
192 retrofit = options.isSet("-retrofit");
193 genCrt = options.isSet(XJCOV);
194 debugstackmap = options.isSet("debugstackmap");
196 emitSourceFile = options.isUnset(G_CUSTOM) ||
197 options.isSet(G_CUSTOM, "source");
199 String dumpModFlags = options.get("dumpmodifiers");
200 dumpClassModifiers =
201 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1);
202 dumpFieldModifiers =
203 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1);
204 dumpInnerClassModifiers =
205 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1);
206 dumpMethodModifiers =
207 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1);
208 }
210 /******************************************************************
211 * Diagnostics: dump generated class names and modifiers
212 ******************************************************************/
214 /** Value of option 'dumpmodifiers' is a string
215 * indicating which modifiers should be dumped for debugging:
216 * 'c' -- classes
217 * 'f' -- fields
218 * 'i' -- innerclass attributes
219 * 'm' -- methods
220 * For example, to dump everything:
221 * javac -XDdumpmodifiers=cifm MyProg.java
222 */
223 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c
224 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f
225 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
226 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m
229 /** Return flags as a string, separated by " ".
230 */
231 public static String flagNames(long flags) {
232 StringBuilder sbuf = new StringBuilder();
233 int i = 0;
234 long f = flags & StandardFlags;
235 while (f != 0) {
236 if ((f & 1) != 0) {
237 sbuf.append(" ");
238 sbuf.append(flagName[i]);
239 }
240 f = f >> 1;
241 i++;
242 }
243 return sbuf.toString();
244 }
245 //where
246 private final static String[] flagName = {
247 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
248 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
249 "ABSTRACT", "STRICTFP"};
251 /******************************************************************
252 * Output routines
253 ******************************************************************/
255 /** Write a character into given byte buffer;
256 * byte buffer will not be grown.
257 */
258 void putChar(ByteBuffer buf, int op, int x) {
259 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
260 buf.elems[op+1] = (byte)((x ) & 0xFF);
261 }
263 /** Write an integer into given byte buffer;
264 * byte buffer will not be grown.
265 */
266 void putInt(ByteBuffer buf, int adr, int x) {
267 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
268 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
269 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
270 buf.elems[adr+3] = (byte)((x ) & 0xFF);
271 }
273 /******************************************************************
274 * Signature Generation
275 ******************************************************************/
277 /** Assemble signature of given type in string buffer.
278 */
279 void assembleSig(Type type) {
280 type = type.unannotatedType();
281 switch (type.getTag()) {
282 case BYTE:
283 sigbuf.appendByte('B');
284 break;
285 case SHORT:
286 sigbuf.appendByte('S');
287 break;
288 case CHAR:
289 sigbuf.appendByte('C');
290 break;
291 case INT:
292 sigbuf.appendByte('I');
293 break;
294 case LONG:
295 sigbuf.appendByte('J');
296 break;
297 case FLOAT:
298 sigbuf.appendByte('F');
299 break;
300 case DOUBLE:
301 sigbuf.appendByte('D');
302 break;
303 case BOOLEAN:
304 sigbuf.appendByte('Z');
305 break;
306 case VOID:
307 sigbuf.appendByte('V');
308 break;
309 case CLASS:
310 sigbuf.appendByte('L');
311 assembleClassSig(type);
312 sigbuf.appendByte(';');
313 break;
314 case ARRAY:
315 ArrayType at = (ArrayType)type;
316 sigbuf.appendByte('[');
317 assembleSig(at.elemtype);
318 break;
319 case METHOD:
320 MethodType mt = (MethodType)type;
321 sigbuf.appendByte('(');
322 assembleSig(mt.argtypes);
323 sigbuf.appendByte(')');
324 assembleSig(mt.restype);
325 if (hasTypeVar(mt.thrown)) {
326 for (List<Type> l = mt.thrown; l.nonEmpty(); l = l.tail) {
327 sigbuf.appendByte('^');
328 assembleSig(l.head);
329 }
330 }
331 break;
332 case WILDCARD: {
333 WildcardType ta = (WildcardType) type;
334 switch (ta.kind) {
335 case SUPER:
336 sigbuf.appendByte('-');
337 assembleSig(ta.type);
338 break;
339 case EXTENDS:
340 sigbuf.appendByte('+');
341 assembleSig(ta.type);
342 break;
343 case UNBOUND:
344 sigbuf.appendByte('*');
345 break;
346 default:
347 throw new AssertionError(ta.kind);
348 }
349 break;
350 }
351 case TYPEVAR:
352 sigbuf.appendByte('T');
353 sigbuf.appendName(type.tsym.name);
354 sigbuf.appendByte(';');
355 break;
356 case FORALL:
357 ForAll ft = (ForAll)type;
358 assembleParamsSig(ft.tvars);
359 assembleSig(ft.qtype);
360 break;
361 case UNINITIALIZED_THIS:
362 case UNINITIALIZED_OBJECT:
363 // we don't yet have a spec for uninitialized types in the
364 // local variable table
365 assembleSig(types.erasure(((UninitializedType)type).qtype));
366 break;
367 default:
368 throw new AssertionError("typeSig " + type.getTag());
369 }
370 }
372 boolean hasTypeVar(List<Type> l) {
373 while (l.nonEmpty()) {
374 if (l.head.hasTag(TYPEVAR)) return true;
375 l = l.tail;
376 }
377 return false;
378 }
380 void assembleClassSig(Type type) {
381 type = type.unannotatedType();
382 ClassType ct = (ClassType)type;
383 ClassSymbol c = (ClassSymbol)ct.tsym;
384 enterInner(c);
385 Type outer = ct.getEnclosingType();
386 if (outer.allparams().nonEmpty()) {
387 boolean rawOuter =
388 c.owner.kind == MTH || // either a local class
389 c.name == names.empty; // or anonymous
390 assembleClassSig(rawOuter
391 ? types.erasure(outer)
392 : outer);
393 sigbuf.appendByte('.');
394 Assert.check(c.flatname.startsWith(c.owner.enclClass().flatname));
395 sigbuf.appendName(rawOuter
396 ? c.flatname.subName(c.owner.enclClass().flatname.getByteLength()+1,c.flatname.getByteLength())
397 : c.name);
398 } else {
399 sigbuf.appendBytes(externalize(c.flatname));
400 }
401 if (ct.getTypeArguments().nonEmpty()) {
402 sigbuf.appendByte('<');
403 assembleSig(ct.getTypeArguments());
404 sigbuf.appendByte('>');
405 }
406 }
409 void assembleSig(List<Type> types) {
410 for (List<Type> ts = types; ts.nonEmpty(); ts = ts.tail)
411 assembleSig(ts.head);
412 }
414 void assembleParamsSig(List<Type> typarams) {
415 sigbuf.appendByte('<');
416 for (List<Type> ts = typarams; ts.nonEmpty(); ts = ts.tail) {
417 TypeVar tvar = (TypeVar)ts.head;
418 sigbuf.appendName(tvar.tsym.name);
419 List<Type> bounds = types.getBounds(tvar);
420 if ((bounds.head.tsym.flags() & INTERFACE) != 0) {
421 sigbuf.appendByte(':');
422 }
423 for (List<Type> l = bounds; l.nonEmpty(); l = l.tail) {
424 sigbuf.appendByte(':');
425 assembleSig(l.head);
426 }
427 }
428 sigbuf.appendByte('>');
429 }
431 /** Return signature of given type
432 */
433 Name typeSig(Type type) {
434 Assert.check(sigbuf.length == 0);
435 //- System.out.println(" ? " + type);
436 assembleSig(type);
437 Name n = sigbuf.toName(names);
438 sigbuf.reset();
439 //- System.out.println(" " + n);
440 return n;
441 }
443 /** Given a type t, return the extended class name of its erasure in
444 * external representation.
445 */
446 public Name xClassName(Type t) {
447 if (t.hasTag(CLASS)) {
448 return names.fromUtf(externalize(t.tsym.flatName()));
449 } else if (t.hasTag(ARRAY)) {
450 return typeSig(types.erasure(t));
451 } else {
452 throw new AssertionError("xClassName");
453 }
454 }
456 /******************************************************************
457 * Writing the Constant Pool
458 ******************************************************************/
460 /** Thrown when the constant pool is over full.
461 */
462 public static class PoolOverflow extends Exception {
463 private static final long serialVersionUID = 0;
464 public PoolOverflow() {}
465 }
466 public static class StringOverflow extends Exception {
467 private static final long serialVersionUID = 0;
468 public final String value;
469 public StringOverflow(String s) {
470 value = s;
471 }
472 }
474 /** Write constant pool to pool buffer.
475 * Note: during writing, constant pool
476 * might grow since some parts of constants still need to be entered.
477 */
478 void writePool(Pool pool) throws PoolOverflow, StringOverflow {
479 int poolCountIdx = poolbuf.length;
480 poolbuf.appendChar(0);
481 int i = 1;
482 while (i < pool.pp) {
483 Object value = pool.pool[i];
484 Assert.checkNonNull(value);
485 if (value instanceof Method || value instanceof Variable)
486 value = ((DelegatedSymbol)value).getUnderlyingSymbol();
488 if (value instanceof MethodSymbol) {
489 MethodSymbol m = (MethodSymbol)value;
490 if (!m.isDynamic()) {
491 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
492 ? CONSTANT_InterfaceMethodref
493 : CONSTANT_Methodref);
494 poolbuf.appendChar(pool.put(m.owner));
495 poolbuf.appendChar(pool.put(nameType(m)));
496 } else {
497 //invokedynamic
498 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m;
499 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types);
500 DynamicMethod dynMeth = new DynamicMethod(dynSym, types);
501 bootstrapMethods.put(dynMeth, handle);
502 //init cp entries
503 pool.put(names.BootstrapMethods);
504 pool.put(handle);
505 for (Object staticArg : dynSym.staticArgs) {
506 pool.put(staticArg);
507 }
508 poolbuf.appendByte(CONSTANT_InvokeDynamic);
509 poolbuf.appendChar(bootstrapMethods.size() - 1);
510 poolbuf.appendChar(pool.put(nameType(dynSym)));
511 }
512 } else if (value instanceof VarSymbol) {
513 VarSymbol v = (VarSymbol)value;
514 poolbuf.appendByte(CONSTANT_Fieldref);
515 poolbuf.appendChar(pool.put(v.owner));
516 poolbuf.appendChar(pool.put(nameType(v)));
517 } else if (value instanceof Name) {
518 poolbuf.appendByte(CONSTANT_Utf8);
519 byte[] bs = ((Name)value).toUtf();
520 poolbuf.appendChar(bs.length);
521 poolbuf.appendBytes(bs, 0, bs.length);
522 if (bs.length > Pool.MAX_STRING_LENGTH)
523 throw new StringOverflow(value.toString());
524 } else if (value instanceof ClassSymbol) {
525 ClassSymbol c = (ClassSymbol)value;
526 if (c.owner.kind == TYP) pool.put(c.owner);
527 poolbuf.appendByte(CONSTANT_Class);
528 if (c.type.hasTag(ARRAY)) {
529 poolbuf.appendChar(pool.put(typeSig(c.type)));
530 } else {
531 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
532 enterInner(c);
533 }
534 } else if (value instanceof NameAndType) {
535 NameAndType nt = (NameAndType)value;
536 poolbuf.appendByte(CONSTANT_NameandType);
537 poolbuf.appendChar(pool.put(nt.name));
538 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type)));
539 } else if (value instanceof Integer) {
540 poolbuf.appendByte(CONSTANT_Integer);
541 poolbuf.appendInt(((Integer)value).intValue());
542 } else if (value instanceof Long) {
543 poolbuf.appendByte(CONSTANT_Long);
544 poolbuf.appendLong(((Long)value).longValue());
545 i++;
546 } else if (value instanceof Float) {
547 poolbuf.appendByte(CONSTANT_Float);
548 poolbuf.appendFloat(((Float)value).floatValue());
549 } else if (value instanceof Double) {
550 poolbuf.appendByte(CONSTANT_Double);
551 poolbuf.appendDouble(((Double)value).doubleValue());
552 i++;
553 } else if (value instanceof String) {
554 poolbuf.appendByte(CONSTANT_String);
555 poolbuf.appendChar(pool.put(names.fromString((String)value)));
556 } else if (value instanceof UniqueType) {
557 Type type = ((UniqueType)value).type;
558 if (type instanceof MethodType) {
559 poolbuf.appendByte(CONSTANT_MethodType);
560 poolbuf.appendChar(pool.put(typeSig((MethodType)type)));
561 } else {
562 if (type.hasTag(CLASS)) enterInner((ClassSymbol)type.tsym);
563 poolbuf.appendByte(CONSTANT_Class);
564 poolbuf.appendChar(pool.put(xClassName(type)));
565 }
566 } else if (value instanceof MethodHandle) {
567 MethodHandle ref = (MethodHandle)value;
568 poolbuf.appendByte(CONSTANT_MethodHandle);
569 poolbuf.appendByte(ref.refKind);
570 poolbuf.appendChar(pool.put(ref.refSym));
571 } else {
572 Assert.error("writePool " + value);
573 }
574 i++;
575 }
576 if (pool.pp > Pool.MAX_ENTRIES)
577 throw new PoolOverflow();
578 putChar(poolbuf, poolCountIdx, pool.pp);
579 }
581 /** Given a field, return its name.
582 */
583 Name fieldName(Symbol sym) {
584 if (scramble && (sym.flags() & PRIVATE) != 0 ||
585 scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0)
586 return names.fromString("_$" + sym.name.getIndex());
587 else
588 return sym.name;
589 }
591 /** Given a symbol, return its name-and-type.
592 */
593 NameAndType nameType(Symbol sym) {
594 return new NameAndType(fieldName(sym),
595 retrofit
596 ? sym.erasure(types)
597 : sym.externalType(types), types);
598 // if we retrofit, then the NameAndType has been read in as is
599 // and no change is necessary. If we compile normally, the
600 // NameAndType is generated from a symbol reference, and the
601 // adjustment of adding an additional this$n parameter needs to be made.
602 }
604 /******************************************************************
605 * Writing Attributes
606 ******************************************************************/
608 /** Write header for an attribute to data buffer and return
609 * position past attribute length index.
610 */
611 int writeAttr(Name attrName) {
612 databuf.appendChar(pool.put(attrName));
613 databuf.appendInt(0);
614 return databuf.length;
615 }
617 /** Fill in attribute length.
618 */
619 void endAttr(int index) {
620 putInt(databuf, index - 4, databuf.length - index);
621 }
623 /** Leave space for attribute count and return index for
624 * number of attributes field.
625 */
626 int beginAttrs() {
627 databuf.appendChar(0);
628 return databuf.length;
629 }
631 /** Fill in number of attributes.
632 */
633 void endAttrs(int index, int count) {
634 putChar(databuf, index - 2, count);
635 }
637 /** Write the EnclosingMethod attribute if needed.
638 * Returns the number of attributes written (0 or 1).
639 */
640 int writeEnclosingMethodAttribute(ClassSymbol c) {
641 if (!target.hasEnclosingMethodAttribute())
642 return 0;
643 return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
644 }
646 /** Write the EnclosingMethod attribute with a specified name.
647 * Returns the number of attributes written (0 or 1).
648 */
649 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
650 if (c.owner.kind != MTH && // neither a local class
651 c.name != names.empty) // nor anonymous
652 return 0;
654 int alenIdx = writeAttr(attributeName);
655 ClassSymbol enclClass = c.owner.enclClass();
656 MethodSymbol enclMethod =
657 (c.owner.type == null // local to init block
658 || c.owner.kind != MTH) // or member init
659 ? null
660 : (MethodSymbol)c.owner;
661 databuf.appendChar(pool.put(enclClass));
662 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
663 endAttr(alenIdx);
664 return 1;
665 }
667 /** Write flag attributes; return number of attributes written.
668 */
669 int writeFlagAttrs(long flags) {
670 int acount = 0;
671 if ((flags & DEPRECATED) != 0) {
672 int alenIdx = writeAttr(names.Deprecated);
673 endAttr(alenIdx);
674 acount++;
675 }
676 if ((flags & ENUM) != 0 && !target.useEnumFlag()) {
677 int alenIdx = writeAttr(names.Enum);
678 endAttr(alenIdx);
679 acount++;
680 }
681 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) {
682 int alenIdx = writeAttr(names.Synthetic);
683 endAttr(alenIdx);
684 acount++;
685 }
686 if ((flags & BRIDGE) != 0 && !target.useBridgeFlag()) {
687 int alenIdx = writeAttr(names.Bridge);
688 endAttr(alenIdx);
689 acount++;
690 }
691 if ((flags & VARARGS) != 0 && !target.useVarargsFlag()) {
692 int alenIdx = writeAttr(names.Varargs);
693 endAttr(alenIdx);
694 acount++;
695 }
696 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) {
697 int alenIdx = writeAttr(names.Annotation);
698 endAttr(alenIdx);
699 acount++;
700 }
701 return acount;
702 }
704 /** Write member (field or method) attributes;
705 * return number of attributes written.
706 */
707 int writeMemberAttrs(Symbol sym) {
708 int acount = writeFlagAttrs(sym.flags());
709 long flags = sym.flags();
710 if (source.allowGenerics() &&
711 (flags & (SYNTHETIC|BRIDGE)) != SYNTHETIC &&
712 (flags & ANONCONSTR) == 0 &&
713 (!types.isSameType(sym.type, sym.erasure(types)) ||
714 hasTypeVar(sym.type.getThrownTypes()))) {
715 // note that a local class with captured variables
716 // will get a signature attribute
717 int alenIdx = writeAttr(names.Signature);
718 databuf.appendChar(pool.put(typeSig(sym.type)));
719 endAttr(alenIdx);
720 acount++;
721 }
722 acount += writeJavaAnnotations(sym.getRawAttributes());
723 acount += writeTypeAnnotations(sym.getRawTypeAttributes());
724 return acount;
725 }
727 /**
728 * Write method parameter names attribute.
729 */
730 int writeMethodParametersAttr(MethodSymbol m) {
731 if (m.params != null && 0 != m.params.length()) {
732 int attrIndex = writeAttr(names.MethodParameters);
733 databuf.appendByte(m.params.length());
734 for (VarSymbol s : m.params) {
735 // TODO: expand to cover synthesized, once we figure out
736 // how to represent that.
737 final int flags = (int) s.flags() & (FINAL | SYNTHETIC);
738 // output parameter info
739 databuf.appendChar(pool.put(s.name));
740 databuf.appendInt(flags);
741 }
742 endAttr(attrIndex);
743 return 1;
744 } else
745 return 0;
746 }
749 /** Write method parameter annotations;
750 * return number of attributes written.
751 */
752 int writeParameterAttrs(MethodSymbol m) {
753 boolean hasVisible = false;
754 boolean hasInvisible = false;
755 if (m.params != null) for (VarSymbol s : m.params) {
756 for (Attribute.Compound a : s.getRawAttributes()) {
757 switch (types.getRetention(a)) {
758 case SOURCE: break;
759 case CLASS: hasInvisible = true; break;
760 case RUNTIME: hasVisible = true; break;
761 default: ;// /* fail soft */ throw new AssertionError(vis);
762 }
763 }
764 }
766 int attrCount = 0;
767 if (hasVisible) {
768 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
769 databuf.appendByte(m.params.length());
770 for (VarSymbol s : m.params) {
771 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
772 for (Attribute.Compound a : s.getRawAttributes())
773 if (types.getRetention(a) == RetentionPolicy.RUNTIME)
774 buf.append(a);
775 databuf.appendChar(buf.length());
776 for (Attribute.Compound a : buf)
777 writeCompoundAttribute(a);
778 }
779 endAttr(attrIndex);
780 attrCount++;
781 }
782 if (hasInvisible) {
783 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
784 databuf.appendByte(m.params.length());
785 for (VarSymbol s : m.params) {
786 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
787 for (Attribute.Compound a : s.getRawAttributes())
788 if (types.getRetention(a) == RetentionPolicy.CLASS)
789 buf.append(a);
790 databuf.appendChar(buf.length());
791 for (Attribute.Compound a : buf)
792 writeCompoundAttribute(a);
793 }
794 endAttr(attrIndex);
795 attrCount++;
796 }
797 return attrCount;
798 }
800 /**********************************************************************
801 * Writing Java-language annotations (aka metadata, attributes)
802 **********************************************************************/
804 /** Write Java-language annotations; return number of JVM
805 * attributes written (zero or one).
806 */
807 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
808 if (attrs.isEmpty()) return 0;
809 ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>();
810 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>();
811 for (Attribute.Compound a : attrs) {
812 switch (types.getRetention(a)) {
813 case SOURCE: break;
814 case CLASS: invisibles.append(a); break;
815 case RUNTIME: visibles.append(a); break;
816 default: ;// /* fail soft */ throw new AssertionError(vis);
817 }
818 }
820 int attrCount = 0;
821 if (visibles.length() != 0) {
822 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
823 databuf.appendChar(visibles.length());
824 for (Attribute.Compound a : visibles)
825 writeCompoundAttribute(a);
826 endAttr(attrIndex);
827 attrCount++;
828 }
829 if (invisibles.length() != 0) {
830 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
831 databuf.appendChar(invisibles.length());
832 for (Attribute.Compound a : invisibles)
833 writeCompoundAttribute(a);
834 endAttr(attrIndex);
835 attrCount++;
836 }
837 return attrCount;
838 }
840 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos) {
841 if (typeAnnos.isEmpty()) return 0;
843 ListBuffer<Attribute.TypeCompound> visibles = ListBuffer.lb();
844 ListBuffer<Attribute.TypeCompound> invisibles = ListBuffer.lb();
846 for (Attribute.TypeCompound tc : typeAnnos) {
847 if (tc.position == null || tc.position.type == TargetType.UNKNOWN) {
848 boolean found = false;
849 // TODO: the position for the container annotation of a
850 // repeating type annotation has to be set.
851 // This cannot be done when the container is created, because
852 // then the position is not determined yet.
853 // How can we link these pieces better together?
854 if (tc.values.size() == 1) {
855 Pair<MethodSymbol, Attribute> val = tc.values.get(0);
856 if (val.fst.getSimpleName().contentEquals("value") &&
857 val.snd instanceof Attribute.Array) {
858 Attribute.Array arr = (Attribute.Array) val.snd;
859 if (arr.values.length != 0 &&
860 arr.values[0] instanceof Attribute.TypeCompound) {
861 TypeCompound atycomp = (Attribute.TypeCompound) arr.values[0];
862 if (atycomp.position.type != TargetType.UNKNOWN) {
863 tc.position = atycomp.position;
864 found = true;
865 }
866 }
867 }
868 }
869 if (!found) {
870 // This happens for nested types like @A Outer. @B Inner.
871 // For method parameters we get the annotation twice! Once with
872 // a valid position, once unknown.
873 // TODO: find a cleaner solution.
874 // System.err.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
875 continue;
876 }
877 }
878 if (!tc.position.emitToClassfile())
879 continue;
880 switch (types.getRetention(tc)) {
881 case SOURCE: break;
882 case CLASS: invisibles.append(tc); break;
883 case RUNTIME: visibles.append(tc); break;
884 default: ;// /* fail soft */ throw new AssertionError(vis);
885 }
886 }
888 int attrCount = 0;
889 if (visibles.length() != 0) {
890 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
891 databuf.appendChar(visibles.length());
892 for (Attribute.TypeCompound p : visibles)
893 writeTypeAnnotation(p);
894 endAttr(attrIndex);
895 attrCount++;
896 }
898 if (invisibles.length() != 0) {
899 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
900 databuf.appendChar(invisibles.length());
901 for (Attribute.TypeCompound p : invisibles)
902 writeTypeAnnotation(p);
903 endAttr(attrIndex);
904 attrCount++;
905 }
907 return attrCount;
908 }
910 /** A visitor to write an attribute including its leading
911 * single-character marker.
912 */
913 class AttributeWriter implements Attribute.Visitor {
914 public void visitConstant(Attribute.Constant _value) {
915 Object value = _value.value;
916 switch (_value.type.getTag()) {
917 case BYTE:
918 databuf.appendByte('B');
919 break;
920 case CHAR:
921 databuf.appendByte('C');
922 break;
923 case SHORT:
924 databuf.appendByte('S');
925 break;
926 case INT:
927 databuf.appendByte('I');
928 break;
929 case LONG:
930 databuf.appendByte('J');
931 break;
932 case FLOAT:
933 databuf.appendByte('F');
934 break;
935 case DOUBLE:
936 databuf.appendByte('D');
937 break;
938 case BOOLEAN:
939 databuf.appendByte('Z');
940 break;
941 case CLASS:
942 Assert.check(value instanceof String);
943 databuf.appendByte('s');
944 value = names.fromString(value.toString()); // CONSTANT_Utf8
945 break;
946 default:
947 throw new AssertionError(_value.type);
948 }
949 databuf.appendChar(pool.put(value));
950 }
951 public void visitEnum(Attribute.Enum e) {
952 databuf.appendByte('e');
953 databuf.appendChar(pool.put(typeSig(e.value.type)));
954 databuf.appendChar(pool.put(e.value.name));
955 }
956 public void visitClass(Attribute.Class clazz) {
957 databuf.appendByte('c');
958 databuf.appendChar(pool.put(typeSig(clazz.classType)));
959 }
960 public void visitCompound(Attribute.Compound compound) {
961 databuf.appendByte('@');
962 writeCompoundAttribute(compound);
963 }
964 public void visitError(Attribute.Error x) {
965 throw new AssertionError(x);
966 }
967 public void visitArray(Attribute.Array array) {
968 databuf.appendByte('[');
969 databuf.appendChar(array.values.length);
970 for (Attribute a : array.values) {
971 a.accept(this);
972 }
973 }
974 }
975 AttributeWriter awriter = new AttributeWriter();
977 /** Write a compound attribute excluding the '@' marker. */
978 void writeCompoundAttribute(Attribute.Compound c) {
979 databuf.appendChar(pool.put(typeSig(c.type)));
980 databuf.appendChar(c.values.length());
981 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
982 databuf.appendChar(pool.put(p.fst.name));
983 p.snd.accept(awriter);
984 }
985 }
987 void writeTypeAnnotation(Attribute.TypeCompound c) {
988 writePosition(c.position);
989 writeCompoundAttribute(c);
990 }
992 void writePosition(TypeAnnotationPosition p) {
993 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
994 switch (p.type) {
995 // instanceof
996 case INSTANCEOF:
997 // new expression
998 case NEW:
999 // constructor/method reference receiver
1000 case CONSTRUCTOR_REFERENCE:
1001 case METHOD_REFERENCE:
1002 databuf.appendChar(p.offset);
1003 break;
1004 // local variable
1005 case LOCAL_VARIABLE:
1006 // resource variable
1007 case RESOURCE_VARIABLE:
1008 databuf.appendChar(p.lvarOffset.length); // for table length
1009 for (int i = 0; i < p.lvarOffset.length; ++i) {
1010 databuf.appendChar(p.lvarOffset[i]);
1011 databuf.appendChar(p.lvarLength[i]);
1012 databuf.appendChar(p.lvarIndex[i]);
1013 }
1014 break;
1015 // exception parameter
1016 case EXCEPTION_PARAMETER:
1017 databuf.appendByte(p.exception_index);
1018 break;
1019 // method receiver
1020 case METHOD_RECEIVER:
1021 // Do nothing
1022 break;
1023 // type parameter
1024 case CLASS_TYPE_PARAMETER:
1025 case METHOD_TYPE_PARAMETER:
1026 databuf.appendByte(p.parameter_index);
1027 break;
1028 // type parameter bound
1029 case CLASS_TYPE_PARAMETER_BOUND:
1030 case METHOD_TYPE_PARAMETER_BOUND:
1031 databuf.appendByte(p.parameter_index);
1032 databuf.appendByte(p.bound_index);
1033 break;
1034 // class extends or implements clause
1035 case CLASS_EXTENDS:
1036 databuf.appendChar(p.type_index);
1037 break;
1038 // throws
1039 case THROWS:
1040 databuf.appendChar(p.type_index);
1041 break;
1042 // method parameter
1043 case METHOD_FORMAL_PARAMETER:
1044 databuf.appendByte(p.parameter_index);
1045 break;
1046 // type cast
1047 case CAST:
1048 // method/constructor/reference type argument
1049 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
1050 case METHOD_INVOCATION_TYPE_ARGUMENT:
1051 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
1052 case METHOD_REFERENCE_TYPE_ARGUMENT:
1053 databuf.appendChar(p.offset);
1054 databuf.appendByte(p.type_index);
1055 break;
1056 // We don't need to worry about these
1057 case METHOD_RETURN:
1058 case FIELD:
1059 break;
1060 case UNKNOWN:
1061 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
1062 default:
1063 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
1064 }
1066 { // Append location data for generics/arrays.
1067 databuf.appendByte(p.location.size());
1068 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
1069 for (int i : loc)
1070 databuf.appendByte((byte)i);
1071 }
1072 }
1074 /**********************************************************************
1075 * Writing Objects
1076 **********************************************************************/
1078 /** Enter an inner class into the `innerClasses' set/queue.
1079 */
1080 void enterInner(ClassSymbol c) {
1081 if (c.type.isCompound()) {
1082 throw new AssertionError("Unexpected intersection type: " + c.type);
1083 }
1084 try {
1085 c.complete();
1086 } catch (CompletionFailure ex) {
1087 System.err.println("error: " + c + ": " + ex.getMessage());
1088 throw ex;
1089 }
1090 if (!c.type.hasTag(CLASS)) return; // arrays
1091 if (pool != null && // pool might be null if called from xClassName
1092 c.owner.enclClass() != null &&
1093 (innerClasses == null || !innerClasses.contains(c))) {
1094 // log.errWriter.println("enter inner " + c);//DEBUG
1095 enterInner(c.owner.enclClass());
1096 pool.put(c);
1097 pool.put(c.name);
1098 if (innerClasses == null) {
1099 innerClasses = new HashSet<ClassSymbol>();
1100 innerClassesQueue = new ListBuffer<ClassSymbol>();
1101 pool.put(names.InnerClasses);
1102 }
1103 innerClasses.add(c);
1104 innerClassesQueue.append(c);
1105 }
1106 }
1108 /** Write "inner classes" attribute.
1109 */
1110 void writeInnerClasses() {
1111 int alenIdx = writeAttr(names.InnerClasses);
1112 databuf.appendChar(innerClassesQueue.length());
1113 for (List<ClassSymbol> l = innerClassesQueue.toList();
1114 l.nonEmpty();
1115 l = l.tail) {
1116 ClassSymbol inner = l.head;
1117 char flags = (char) adjustFlags(inner.flags_field);
1118 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1119 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag
1120 if (dumpInnerClassModifiers) {
1121 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1122 pw.println("INNERCLASS " + inner.name);
1123 pw.println("---" + flagNames(flags));
1124 }
1125 databuf.appendChar(pool.get(inner));
1126 databuf.appendChar(
1127 inner.owner.kind == TYP ? pool.get(inner.owner) : 0);
1128 databuf.appendChar(
1129 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1130 databuf.appendChar(flags);
1131 }
1132 endAttr(alenIdx);
1133 }
1135 /** Write "bootstrapMethods" attribute.
1136 */
1137 void writeBootstrapMethods() {
1138 int alenIdx = writeAttr(names.BootstrapMethods);
1139 databuf.appendChar(bootstrapMethods.size());
1140 for (Map.Entry<DynamicMethod, MethodHandle> entry : bootstrapMethods.entrySet()) {
1141 DynamicMethod dmeth = entry.getKey();
1142 DynamicMethodSymbol dsym = (DynamicMethodSymbol)dmeth.baseSymbol();
1143 //write BSM handle
1144 databuf.appendChar(pool.get(entry.getValue()));
1145 //write static args length
1146 databuf.appendChar(dsym.staticArgs.length);
1147 //write static args array
1148 Object[] uniqueArgs = dmeth.uniqueStaticArgs;
1149 for (Object o : uniqueArgs) {
1150 databuf.appendChar(pool.get(o));
1151 }
1152 }
1153 endAttr(alenIdx);
1154 }
1156 /** Write field symbol, entering all references into constant pool.
1157 */
1158 void writeField(VarSymbol v) {
1159 int flags = adjustFlags(v.flags());
1160 databuf.appendChar(flags);
1161 if (dumpFieldModifiers) {
1162 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1163 pw.println("FIELD " + fieldName(v));
1164 pw.println("---" + flagNames(v.flags()));
1165 }
1166 databuf.appendChar(pool.put(fieldName(v)));
1167 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1168 int acountIdx = beginAttrs();
1169 int acount = 0;
1170 if (v.getConstValue() != null) {
1171 int alenIdx = writeAttr(names.ConstantValue);
1172 databuf.appendChar(pool.put(v.getConstValue()));
1173 endAttr(alenIdx);
1174 acount++;
1175 }
1176 acount += writeMemberAttrs(v);
1177 endAttrs(acountIdx, acount);
1178 }
1180 /** Write method symbol, entering all references into constant pool.
1181 */
1182 void writeMethod(MethodSymbol m) {
1183 int flags = adjustFlags(m.flags());
1184 databuf.appendChar(flags);
1185 if (dumpMethodModifiers) {
1186 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1187 pw.println("METHOD " + fieldName(m));
1188 pw.println("---" + flagNames(m.flags()));
1189 }
1190 databuf.appendChar(pool.put(fieldName(m)));
1191 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1192 int acountIdx = beginAttrs();
1193 int acount = 0;
1194 if (m.code != null) {
1195 int alenIdx = writeAttr(names.Code);
1196 writeCode(m.code);
1197 m.code = null; // to conserve space
1198 endAttr(alenIdx);
1199 acount++;
1200 }
1201 List<Type> thrown = m.erasure(types).getThrownTypes();
1202 if (thrown.nonEmpty()) {
1203 int alenIdx = writeAttr(names.Exceptions);
1204 databuf.appendChar(thrown.length());
1205 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1206 databuf.appendChar(pool.put(l.head.tsym));
1207 endAttr(alenIdx);
1208 acount++;
1209 }
1210 if (m.defaultValue != null) {
1211 int alenIdx = writeAttr(names.AnnotationDefault);
1212 m.defaultValue.accept(awriter);
1213 endAttr(alenIdx);
1214 acount++;
1215 }
1216 if (options.isSet(PARAMETERS))
1217 acount += writeMethodParametersAttr(m);
1218 acount += writeMemberAttrs(m);
1219 acount += writeParameterAttrs(m);
1220 endAttrs(acountIdx, acount);
1221 }
1223 /** Write code attribute of method.
1224 */
1225 void writeCode(Code code) {
1226 databuf.appendChar(code.max_stack);
1227 databuf.appendChar(code.max_locals);
1228 databuf.appendInt(code.cp);
1229 databuf.appendBytes(code.code, 0, code.cp);
1230 databuf.appendChar(code.catchInfo.length());
1231 for (List<char[]> l = code.catchInfo.toList();
1232 l.nonEmpty();
1233 l = l.tail) {
1234 for (int i = 0; i < l.head.length; i++)
1235 databuf.appendChar(l.head[i]);
1236 }
1237 int acountIdx = beginAttrs();
1238 int acount = 0;
1240 if (code.lineInfo.nonEmpty()) {
1241 int alenIdx = writeAttr(names.LineNumberTable);
1242 databuf.appendChar(code.lineInfo.length());
1243 for (List<char[]> l = code.lineInfo.reverse();
1244 l.nonEmpty();
1245 l = l.tail)
1246 for (int i = 0; i < l.head.length; i++)
1247 databuf.appendChar(l.head[i]);
1248 endAttr(alenIdx);
1249 acount++;
1250 }
1252 if (genCrt && (code.crt != null)) {
1253 CRTable crt = code.crt;
1254 int alenIdx = writeAttr(names.CharacterRangeTable);
1255 int crtIdx = beginAttrs();
1256 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1257 endAttrs(crtIdx, crtEntries);
1258 endAttr(alenIdx);
1259 acount++;
1260 }
1262 // counter for number of generic local variables
1263 int nGenericVars = 0;
1265 if (code.varBufferSize > 0) {
1266 int alenIdx = writeAttr(names.LocalVariableTable);
1267 databuf.appendChar(code.varBufferSize);
1269 for (int i=0; i<code.varBufferSize; i++) {
1270 Code.LocalVar var = code.varBuffer[i];
1272 // write variable info
1273 Assert.check(var.start_pc >= 0
1274 && var.start_pc <= code.cp);
1275 databuf.appendChar(var.start_pc);
1276 Assert.check(var.length >= 0
1277 && (var.start_pc + var.length) <= code.cp);
1278 databuf.appendChar(var.length);
1279 VarSymbol sym = var.sym;
1280 databuf.appendChar(pool.put(sym.name));
1281 Type vartype = sym.erasure(types);
1282 if (needsLocalVariableTypeEntry(sym.type))
1283 nGenericVars++;
1284 databuf.appendChar(pool.put(typeSig(vartype)));
1285 databuf.appendChar(var.reg);
1286 }
1287 endAttr(alenIdx);
1288 acount++;
1289 }
1291 if (nGenericVars > 0) {
1292 int alenIdx = writeAttr(names.LocalVariableTypeTable);
1293 databuf.appendChar(nGenericVars);
1294 int count = 0;
1296 for (int i=0; i<code.varBufferSize; i++) {
1297 Code.LocalVar var = code.varBuffer[i];
1298 VarSymbol sym = var.sym;
1299 if (!needsLocalVariableTypeEntry(sym.type))
1300 continue;
1301 count++;
1302 // write variable info
1303 databuf.appendChar(var.start_pc);
1304 databuf.appendChar(var.length);
1305 databuf.appendChar(pool.put(sym.name));
1306 databuf.appendChar(pool.put(typeSig(sym.type)));
1307 databuf.appendChar(var.reg);
1308 }
1309 Assert.check(count == nGenericVars);
1310 endAttr(alenIdx);
1311 acount++;
1312 }
1314 if (code.stackMapBufferSize > 0) {
1315 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1316 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1317 writeStackMap(code);
1318 endAttr(alenIdx);
1319 acount++;
1320 }
1321 endAttrs(acountIdx, acount);
1322 }
1323 //where
1324 private boolean needsLocalVariableTypeEntry(Type t) {
1325 //a local variable needs a type-entry if its type T is generic
1326 //(i.e. |T| != T) and if it's not an intersection type (not supported
1327 //in signature attribute grammar)
1328 return (!types.isSameType(t, types.erasure(t)) &&
1329 !t.isCompound());
1330 }
1332 void writeStackMap(Code code) {
1333 int nframes = code.stackMapBufferSize;
1334 if (debugstackmap) System.out.println(" nframes = " + nframes);
1335 databuf.appendChar(nframes);
1337 switch (code.stackMap) {
1338 case CLDC:
1339 for (int i=0; i<nframes; i++) {
1340 if (debugstackmap) System.out.print(" " + i + ":");
1341 Code.StackMapFrame frame = code.stackMapBuffer[i];
1343 // output PC
1344 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1345 databuf.appendChar(frame.pc);
1347 // output locals
1348 int localCount = 0;
1349 for (int j=0; j<frame.locals.length;
1350 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1351 localCount++;
1352 }
1353 if (debugstackmap) System.out.print(" nlocals=" +
1354 localCount);
1355 databuf.appendChar(localCount);
1356 for (int j=0; j<frame.locals.length;
1357 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1358 if (debugstackmap) System.out.print(" local[" + j + "]=");
1359 writeStackMapType(frame.locals[j]);
1360 }
1362 // output stack
1363 int stackCount = 0;
1364 for (int j=0; j<frame.stack.length;
1365 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1366 stackCount++;
1367 }
1368 if (debugstackmap) System.out.print(" nstack=" +
1369 stackCount);
1370 databuf.appendChar(stackCount);
1371 for (int j=0; j<frame.stack.length;
1372 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1373 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1374 writeStackMapType(frame.stack[j]);
1375 }
1376 if (debugstackmap) System.out.println();
1377 }
1378 break;
1379 case JSR202: {
1380 Assert.checkNull(code.stackMapBuffer);
1381 for (int i=0; i<nframes; i++) {
1382 if (debugstackmap) System.out.print(" " + i + ":");
1383 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1384 frame.write(this);
1385 if (debugstackmap) System.out.println();
1386 }
1387 break;
1388 }
1389 default:
1390 throw new AssertionError("Unexpected stackmap format value");
1391 }
1392 }
1394 //where
1395 void writeStackMapType(Type t) {
1396 if (t == null) {
1397 if (debugstackmap) System.out.print("empty");
1398 databuf.appendByte(0);
1399 }
1400 else switch(t.getTag()) {
1401 case BYTE:
1402 case CHAR:
1403 case SHORT:
1404 case INT:
1405 case BOOLEAN:
1406 if (debugstackmap) System.out.print("int");
1407 databuf.appendByte(1);
1408 break;
1409 case FLOAT:
1410 if (debugstackmap) System.out.print("float");
1411 databuf.appendByte(2);
1412 break;
1413 case DOUBLE:
1414 if (debugstackmap) System.out.print("double");
1415 databuf.appendByte(3);
1416 break;
1417 case LONG:
1418 if (debugstackmap) System.out.print("long");
1419 databuf.appendByte(4);
1420 break;
1421 case BOT: // null
1422 if (debugstackmap) System.out.print("null");
1423 databuf.appendByte(5);
1424 break;
1425 case CLASS:
1426 case ARRAY:
1427 if (debugstackmap) System.out.print("object(" + t + ")");
1428 databuf.appendByte(7);
1429 databuf.appendChar(pool.put(t));
1430 break;
1431 case TYPEVAR:
1432 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1433 databuf.appendByte(7);
1434 databuf.appendChar(pool.put(types.erasure(t).tsym));
1435 break;
1436 case UNINITIALIZED_THIS:
1437 if (debugstackmap) System.out.print("uninit_this");
1438 databuf.appendByte(6);
1439 break;
1440 case UNINITIALIZED_OBJECT:
1441 { UninitializedType uninitType = (UninitializedType)t;
1442 databuf.appendByte(8);
1443 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1444 databuf.appendChar(uninitType.offset);
1445 }
1446 break;
1447 default:
1448 throw new AssertionError();
1449 }
1450 }
1452 /** An entry in the JSR202 StackMapTable */
1453 abstract static class StackMapTableFrame {
1454 abstract int getFrameType();
1456 void write(ClassWriter writer) {
1457 int frameType = getFrameType();
1458 writer.databuf.appendByte(frameType);
1459 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1460 }
1462 static class SameFrame extends StackMapTableFrame {
1463 final int offsetDelta;
1464 SameFrame(int offsetDelta) {
1465 this.offsetDelta = offsetDelta;
1466 }
1467 int getFrameType() {
1468 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1469 }
1470 @Override
1471 void write(ClassWriter writer) {
1472 super.write(writer);
1473 if (getFrameType() == SAME_FRAME_EXTENDED) {
1474 writer.databuf.appendChar(offsetDelta);
1475 if (writer.debugstackmap){
1476 System.out.print(" offset_delta=" + offsetDelta);
1477 }
1478 }
1479 }
1480 }
1482 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1483 final int offsetDelta;
1484 final Type stack;
1485 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1486 this.offsetDelta = offsetDelta;
1487 this.stack = stack;
1488 }
1489 int getFrameType() {
1490 return (offsetDelta < SAME_FRAME_SIZE) ?
1491 (SAME_FRAME_SIZE + offsetDelta) :
1492 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1493 }
1494 @Override
1495 void write(ClassWriter writer) {
1496 super.write(writer);
1497 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1498 writer.databuf.appendChar(offsetDelta);
1499 if (writer.debugstackmap) {
1500 System.out.print(" offset_delta=" + offsetDelta);
1501 }
1502 }
1503 if (writer.debugstackmap) {
1504 System.out.print(" stack[" + 0 + "]=");
1505 }
1506 writer.writeStackMapType(stack);
1507 }
1508 }
1510 static class ChopFrame extends StackMapTableFrame {
1511 final int frameType;
1512 final int offsetDelta;
1513 ChopFrame(int frameType, int offsetDelta) {
1514 this.frameType = frameType;
1515 this.offsetDelta = offsetDelta;
1516 }
1517 int getFrameType() { return frameType; }
1518 @Override
1519 void write(ClassWriter writer) {
1520 super.write(writer);
1521 writer.databuf.appendChar(offsetDelta);
1522 if (writer.debugstackmap) {
1523 System.out.print(" offset_delta=" + offsetDelta);
1524 }
1525 }
1526 }
1528 static class AppendFrame extends StackMapTableFrame {
1529 final int frameType;
1530 final int offsetDelta;
1531 final Type[] locals;
1532 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1533 this.frameType = frameType;
1534 this.offsetDelta = offsetDelta;
1535 this.locals = locals;
1536 }
1537 int getFrameType() { return frameType; }
1538 @Override
1539 void write(ClassWriter writer) {
1540 super.write(writer);
1541 writer.databuf.appendChar(offsetDelta);
1542 if (writer.debugstackmap) {
1543 System.out.print(" offset_delta=" + offsetDelta);
1544 }
1545 for (int i=0; i<locals.length; i++) {
1546 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1547 writer.writeStackMapType(locals[i]);
1548 }
1549 }
1550 }
1552 static class FullFrame extends StackMapTableFrame {
1553 final int offsetDelta;
1554 final Type[] locals;
1555 final Type[] stack;
1556 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1557 this.offsetDelta = offsetDelta;
1558 this.locals = locals;
1559 this.stack = stack;
1560 }
1561 int getFrameType() { return FULL_FRAME; }
1562 @Override
1563 void write(ClassWriter writer) {
1564 super.write(writer);
1565 writer.databuf.appendChar(offsetDelta);
1566 writer.databuf.appendChar(locals.length);
1567 if (writer.debugstackmap) {
1568 System.out.print(" offset_delta=" + offsetDelta);
1569 System.out.print(" nlocals=" + locals.length);
1570 }
1571 for (int i=0; i<locals.length; i++) {
1572 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1573 writer.writeStackMapType(locals[i]);
1574 }
1576 writer.databuf.appendChar(stack.length);
1577 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1578 for (int i=0; i<stack.length; i++) {
1579 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1580 writer.writeStackMapType(stack[i]);
1581 }
1582 }
1583 }
1585 /** Compare this frame with the previous frame and produce
1586 * an entry of compressed stack map frame. */
1587 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1588 int prev_pc,
1589 Type[] prev_locals,
1590 Types types) {
1591 Type[] locals = this_frame.locals;
1592 Type[] stack = this_frame.stack;
1593 int offset_delta = this_frame.pc - prev_pc - 1;
1594 if (stack.length == 1) {
1595 if (locals.length == prev_locals.length
1596 && compare(prev_locals, locals, types) == 0) {
1597 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1598 }
1599 } else if (stack.length == 0) {
1600 int diff_length = compare(prev_locals, locals, types);
1601 if (diff_length == 0) {
1602 return new SameFrame(offset_delta);
1603 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1604 // APPEND
1605 Type[] local_diff = new Type[-diff_length];
1606 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1607 local_diff[j] = locals[i];
1608 }
1609 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1610 offset_delta,
1611 local_diff);
1612 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1613 // CHOP
1614 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1615 offset_delta);
1616 }
1617 }
1618 // FULL_FRAME
1619 return new FullFrame(offset_delta, locals, stack);
1620 }
1622 static boolean isInt(Type t) {
1623 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1624 }
1626 static boolean isSameType(Type t1, Type t2, Types types) {
1627 if (t1 == null) { return t2 == null; }
1628 if (t2 == null) { return false; }
1630 if (isInt(t1) && isInt(t2)) { return true; }
1632 if (t1.hasTag(UNINITIALIZED_THIS)) {
1633 return t2.hasTag(UNINITIALIZED_THIS);
1634 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1635 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1636 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1637 } else {
1638 return false;
1639 }
1640 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1641 return false;
1642 }
1644 return types.isSameType(t1, t2);
1645 }
1647 static int compare(Type[] arr1, Type[] arr2, Types types) {
1648 int diff_length = arr1.length - arr2.length;
1649 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1650 return Integer.MAX_VALUE;
1651 }
1652 int len = (diff_length > 0) ? arr2.length : arr1.length;
1653 for (int i=0; i<len; i++) {
1654 if (!isSameType(arr1[i], arr2[i], types)) {
1655 return Integer.MAX_VALUE;
1656 }
1657 }
1658 return diff_length;
1659 }
1660 }
1662 void writeFields(Scope.Entry e) {
1663 // process them in reverse sibling order;
1664 // i.e., process them in declaration order.
1665 List<VarSymbol> vars = List.nil();
1666 for (Scope.Entry i = e; i != null; i = i.sibling) {
1667 if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym);
1668 }
1669 while (vars.nonEmpty()) {
1670 writeField(vars.head);
1671 vars = vars.tail;
1672 }
1673 }
1675 void writeMethods(Scope.Entry e) {
1676 List<MethodSymbol> methods = List.nil();
1677 for (Scope.Entry i = e; i != null; i = i.sibling) {
1678 if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0)
1679 methods = methods.prepend((MethodSymbol)i.sym);
1680 }
1681 while (methods.nonEmpty()) {
1682 writeMethod(methods.head);
1683 methods = methods.tail;
1684 }
1685 }
1687 /** Emit a class file for a given class.
1688 * @param c The class from which a class file is generated.
1689 */
1690 public JavaFileObject writeClass(ClassSymbol c)
1691 throws IOException, PoolOverflow, StringOverflow
1692 {
1693 JavaFileObject outFile
1694 = fileManager.getJavaFileForOutput(CLASS_OUTPUT,
1695 c.flatname.toString(),
1696 JavaFileObject.Kind.CLASS,
1697 c.sourcefile);
1698 OutputStream out = outFile.openOutputStream();
1699 try {
1700 writeClassFile(out, c);
1701 if (verbose)
1702 log.printVerbose("wrote.file", outFile);
1703 out.close();
1704 out = null;
1705 } finally {
1706 if (out != null) {
1707 // if we are propogating an exception, delete the file
1708 out.close();
1709 outFile.delete();
1710 outFile = null;
1711 }
1712 }
1713 return outFile; // may be null if write failed
1714 }
1716 /** Write class `c' to outstream `out'.
1717 */
1718 public void writeClassFile(OutputStream out, ClassSymbol c)
1719 throws IOException, PoolOverflow, StringOverflow {
1720 Assert.check((c.flags() & COMPOUND) == 0);
1721 databuf.reset();
1722 poolbuf.reset();
1723 sigbuf.reset();
1724 pool = c.pool;
1725 innerClasses = null;
1726 innerClassesQueue = null;
1727 bootstrapMethods = new LinkedHashMap<DynamicMethod, MethodHandle>();
1729 Type supertype = types.supertype(c.type);
1730 List<Type> interfaces = types.interfaces(c.type);
1731 List<Type> typarams = c.type.getTypeArguments();
1733 int flags = adjustFlags(c.flags() & ~DEFAULT);
1734 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1735 flags = flags & ClassFlags & ~STRICTFP;
1736 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1737 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL;
1738 if (dumpClassModifiers) {
1739 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1740 pw.println();
1741 pw.println("CLASSFILE " + c.getQualifiedName());
1742 pw.println("---" + flagNames(flags));
1743 }
1744 databuf.appendChar(flags);
1746 databuf.appendChar(pool.put(c));
1747 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1748 databuf.appendChar(interfaces.length());
1749 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1750 databuf.appendChar(pool.put(l.head.tsym));
1751 int fieldsCount = 0;
1752 int methodsCount = 0;
1753 for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) {
1754 switch (e.sym.kind) {
1755 case VAR: fieldsCount++; break;
1756 case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1757 break;
1758 case TYP: enterInner((ClassSymbol)e.sym); break;
1759 default : Assert.error();
1760 }
1761 }
1763 if (c.trans_local != null) {
1764 for (ClassSymbol local : c.trans_local) {
1765 enterInner(local);
1766 }
1767 }
1769 databuf.appendChar(fieldsCount);
1770 writeFields(c.members().elems);
1771 databuf.appendChar(methodsCount);
1772 writeMethods(c.members().elems);
1774 int acountIdx = beginAttrs();
1775 int acount = 0;
1777 boolean sigReq =
1778 typarams.length() != 0 || supertype.allparams().length() != 0;
1779 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1780 sigReq = l.head.allparams().length() != 0;
1781 if (sigReq) {
1782 Assert.check(source.allowGenerics());
1783 int alenIdx = writeAttr(names.Signature);
1784 if (typarams.length() != 0) assembleParamsSig(typarams);
1785 assembleSig(supertype);
1786 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1787 assembleSig(l.head);
1788 databuf.appendChar(pool.put(sigbuf.toName(names)));
1789 sigbuf.reset();
1790 endAttr(alenIdx);
1791 acount++;
1792 }
1794 if (c.sourcefile != null && emitSourceFile) {
1795 int alenIdx = writeAttr(names.SourceFile);
1796 // WHM 6/29/1999: Strip file path prefix. We do it here at
1797 // the last possible moment because the sourcefile may be used
1798 // elsewhere in error diagnostics. Fixes 4241573.
1799 //databuf.appendChar(c.pool.put(c.sourcefile));
1800 String simpleName = BaseFileObject.getSimpleName(c.sourcefile);
1801 databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1802 endAttr(alenIdx);
1803 acount++;
1804 }
1806 if (genCrt) {
1807 // Append SourceID attribute
1808 int alenIdx = writeAttr(names.SourceID);
1809 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1810 endAttr(alenIdx);
1811 acount++;
1812 // Append CompilationID attribute
1813 alenIdx = writeAttr(names.CompilationID);
1814 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1815 endAttr(alenIdx);
1816 acount++;
1817 }
1819 acount += writeFlagAttrs(c.flags());
1820 acount += writeJavaAnnotations(c.getRawAttributes());
1821 acount += writeTypeAnnotations(c.getRawTypeAttributes());
1822 acount += writeEnclosingMethodAttribute(c);
1823 acount += writeExtraClassAttributes(c);
1825 poolbuf.appendInt(JAVA_MAGIC);
1826 poolbuf.appendChar(target.minorVersion);
1827 poolbuf.appendChar(target.majorVersion);
1829 writePool(c.pool);
1831 if (innerClasses != null) {
1832 writeInnerClasses();
1833 acount++;
1834 }
1836 if (!bootstrapMethods.isEmpty()) {
1837 writeBootstrapMethods();
1838 acount++;
1839 }
1841 endAttrs(acountIdx, acount);
1843 poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1844 out.write(poolbuf.elems, 0, poolbuf.length);
1846 pool = c.pool = null; // to conserve space
1847 }
1849 /**Allows subclasses to write additional class attributes
1850 *
1851 * @return the number of attributes written
1852 */
1853 protected int writeExtraClassAttributes(ClassSymbol c) {
1854 return 0;
1855 }
1857 int adjustFlags(final long flags) {
1858 int result = (int)flags;
1859 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag())
1860 result &= ~SYNTHETIC;
1861 if ((flags & ENUM) != 0 && !target.useEnumFlag())
1862 result &= ~ENUM;
1863 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag())
1864 result &= ~ANNOTATION;
1866 if ((flags & BRIDGE) != 0 && target.useBridgeFlag())
1867 result |= ACC_BRIDGE;
1868 if ((flags & VARARGS) != 0 && target.useVarargsFlag())
1869 result |= ACC_VARARGS;
1870 if ((flags & DEFAULT) != 0)
1871 result &= ~ABSTRACT;
1872 return result;
1873 }
1875 long getLastModified(FileObject filename) {
1876 long mod = 0;
1877 try {
1878 mod = filename.getLastModified();
1879 } catch (SecurityException e) {
1880 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1881 }
1882 return mod;
1883 }
1884 }