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 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29
30 import com.sun.tools.javac.code.*;
31 import com.sun.tools.javac.code.Type.AnnotatedType;
32 import com.sun.tools.javac.jvm.*;
33 import com.sun.tools.javac.main.Option.PkgInfo;
34 import com.sun.tools.javac.tree.*;
35 import com.sun.tools.javac.util.*;
36 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
37 import com.sun.tools.javac.util.List;
38
39 import com.sun.tools.javac.code.Symbol.*;
40 import com.sun.tools.javac.tree.JCTree.*;
41 import com.sun.tools.javac.code.Type.*;
42
43 import com.sun.tools.javac.jvm.Target;
44 import com.sun.tools.javac.tree.EndPosTable;
45
46 import static com.sun.tools.javac.code.Flags.*;
47 import static com.sun.tools.javac.code.Flags.BLOCK;
48 import static com.sun.tools.javac.code.Kinds.*;
49 import static com.sun.tools.javac.code.TypeTag.*;
50 import static com.sun.tools.javac.jvm.ByteCodes.*;
51 import static com.sun.tools.javac.tree.JCTree.Tag.*;
52 import javax.lang.model.type.TypeKind;
53
54 /** This pass translates away some syntactic sugar: inner classes,
55 * class literals, assertions, foreach loops, etc.
56 *
57 * <p><b>This is NOT part of any supported API.
58 * If you write code that depends on this, you do so at your own risk.
59 * This code and its internal interfaces are subject to change or
60 * deletion without notice.</b>
61 */
62 public class Lower extends TreeTranslator {
63 protected static final Context.Key<Lower> lowerKey =
64 new Context.Key<Lower>();
65
66 public static Lower instance(Context context) {
67 Lower instance = context.get(lowerKey);
68 if (instance == null)
69 instance = new Lower(context);
70 return instance;
71 }
72
73 private Names names;
74 private Log log;
75 private Symtab syms;
76 private Resolve rs;
77 private Check chk;
78 private Attr attr;
79 private TreeMaker make;
80 private DiagnosticPosition make_pos;
81 private ClassWriter writer;
82 private ClassReader reader;
83 private ConstFold cfolder;
84 private Target target;
85 private Source source;
86 private boolean allowEnums;
87 private final Name dollarAssertionsDisabled;
88 private final Name classDollar;
89 private Types types;
90 private boolean debugLower;
91 private PkgInfo pkginfoOpt;
92
93 protected Lower(Context context) {
94 context.put(lowerKey, this);
95 names = Names.instance(context);
96 log = Log.instance(context);
97 syms = Symtab.instance(context);
98 rs = Resolve.instance(context);
99 chk = Check.instance(context);
100 attr = Attr.instance(context);
101 make = TreeMaker.instance(context);
102 writer = ClassWriter.instance(context);
103 reader = ClassReader.instance(context);
104 cfolder = ConstFold.instance(context);
105 target = Target.instance(context);
106 source = Source.instance(context);
107 allowEnums = source.allowEnums();
108 dollarAssertionsDisabled = names.
109 fromString(target.syntheticNameChar() + "assertionsDisabled");
110 classDollar = names.
111 fromString("class" + target.syntheticNameChar());
112
113 types = Types.instance(context);
114 Options options = Options.instance(context);
115 debugLower = options.isSet("debuglower");
116 pkginfoOpt = PkgInfo.get(options);
117 }
118
119 /** The currently enclosing class.
120 */
121 ClassSymbol currentClass;
122
123 /** A queue of all translated classes.
124 */
125 ListBuffer<JCTree> translated;
126
127 /** Environment for symbol lookup, set by translateTopLevelClass.
128 */
129 Env<AttrContext> attrEnv;
130
131 /** A hash table mapping syntax trees to their ending source positions.
132 */
133 EndPosTable endPosTable;
134
135 /**************************************************************************
136 * Global mappings
137 *************************************************************************/
138
139 /** A hash table mapping local classes to their definitions.
140 */
141 Map<ClassSymbol, JCClassDecl> classdefs;
142
143 /** A hash table mapping local classes to a list of pruned trees.
144 */
145 public Map<ClassSymbol, List<JCTree>> prunedTree = new WeakHashMap<ClassSymbol, List<JCTree>>();
146
147 /** A hash table mapping virtual accessed symbols in outer subclasses
148 * to the actually referred symbol in superclasses.
149 */
150 Map<Symbol,Symbol> actualSymbols;
151
152 /** The current method definition.
153 */
154 JCMethodDecl currentMethodDef;
155
156 /** The current method symbol.
157 */
158 MethodSymbol currentMethodSym;
159
160 /** The currently enclosing outermost class definition.
161 */
162 JCClassDecl outermostClassDef;
163
164 /** The currently enclosing outermost member definition.
165 */
166 JCTree outermostMemberDef;
167
168 /** A map from local variable symbols to their translation (as per LambdaToMethod).
169 * This is required when a capturing local class is created from a lambda (in which
170 * case the captured symbols should be replaced with the translated lambda symbols).
171 */
172 Map<Symbol, Symbol> lambdaTranslationMap = null;
173
174 /** A navigator class for assembling a mapping from local class symbols
175 * to class definition trees.
176 * There is only one case; all other cases simply traverse down the tree.
177 */
178 class ClassMap extends TreeScanner {
179
180 /** All encountered class defs are entered into classdefs table.
181 */
182 public void visitClassDef(JCClassDecl tree) {
183 classdefs.put(tree.sym, tree);
184 super.visitClassDef(tree);
185 }
186 }
187 ClassMap classMap = new ClassMap();
188
189 /** Map a class symbol to its definition.
190 * @param c The class symbol of which we want to determine the definition.
191 */
192 JCClassDecl classDef(ClassSymbol c) {
193 // First lookup the class in the classdefs table.
194 JCClassDecl def = classdefs.get(c);
195 if (def == null && outermostMemberDef != null) {
196 // If this fails, traverse outermost member definition, entering all
197 // local classes into classdefs, and try again.
198 classMap.scan(outermostMemberDef);
199 def = classdefs.get(c);
200 }
201 if (def == null) {
202 // If this fails, traverse outermost class definition, entering all
203 // local classes into classdefs, and try again.
204 classMap.scan(outermostClassDef);
205 def = classdefs.get(c);
206 }
207 return def;
208 }
209
210 /** A hash table mapping class symbols to lists of free variables.
211 * accessed by them. Only free variables of the method immediately containing
212 * a class are associated with that class.
213 */
214 Map<ClassSymbol,List<VarSymbol>> freevarCache;
215
216 /** A navigator class for collecting the free variables accessed
217 * from a local class. There is only one case; all other cases simply
218 * traverse down the tree. This class doesn't deal with the specific
219 * of Lower - it's an abstract visitor that is meant to be reused in
220 * order to share the local variable capture logic.
221 */
222 abstract class BasicFreeVarCollector extends TreeScanner {
223
224 /** Add all free variables of class c to fvs list
225 * unless they are already there.
226 */
227 abstract void addFreeVars(ClassSymbol c);
228
229 /** If tree refers to a variable in owner of local class, add it to
230 * free variables list.
231 */
232 public void visitIdent(JCIdent tree) {
233 visitSymbol(tree.sym);
234 }
235 // where
236 abstract void visitSymbol(Symbol _sym);
237
238 /** If tree refers to a class instance creation expression
239 * add all free variables of the freshly created class.
240 */
241 public void visitNewClass(JCNewClass tree) {
242 ClassSymbol c = (ClassSymbol)tree.constructor.owner;
243 addFreeVars(c);
244 super.visitNewClass(tree);
245 }
246
247 /** If tree refers to a superclass constructor call,
248 * add all free variables of the superclass.
249 */
250 public void visitApply(JCMethodInvocation tree) {
251 if (TreeInfo.name(tree.meth) == names._super) {
252 addFreeVars((ClassSymbol) TreeInfo.symbol(tree.meth).owner);
253 }
254 super.visitApply(tree);
255 }
256 }
257
258 /**
259 * Lower-specific subclass of {@code BasicFreeVarCollector}.
260 */
261 class FreeVarCollector extends BasicFreeVarCollector {
262
263 /** The owner of the local class.
264 */
265 Symbol owner;
266
267 /** The local class.
268 */
269 ClassSymbol clazz;
270
271 /** The list of owner's variables accessed from within the local class,
272 * without any duplicates.
273 */
274 List<VarSymbol> fvs;
275
276 FreeVarCollector(ClassSymbol clazz) {
277 this.clazz = clazz;
278 this.owner = clazz.owner;
279 this.fvs = List.nil();
280 }
281
282 /** Add free variable to fvs list unless it is already there.
283 */
284 private void addFreeVar(VarSymbol v) {
285 for (List<VarSymbol> l = fvs; l.nonEmpty(); l = l.tail)
286 if (l.head == v) return;
287 fvs = fvs.prepend(v);
288 }
289
290 @Override
291 void addFreeVars(ClassSymbol c) {
292 List<VarSymbol> fvs = freevarCache.get(c);
293 if (fvs != null) {
294 for (List<VarSymbol> l = fvs; l.nonEmpty(); l = l.tail) {
295 addFreeVar(l.head);
296 }
297 }
298 }
299
300 @Override
301 void visitSymbol(Symbol _sym) {
302 Symbol sym = _sym;
303 if (sym.kind == VAR || sym.kind == MTH) {
304 while (sym != null && sym.owner != owner)
305 sym = proxies.lookup(proxyName(sym.name)).sym;
306 if (sym != null && sym.owner == owner) {
307 VarSymbol v = (VarSymbol)sym;
308 if (v.getConstValue() == null) {
309 addFreeVar(v);
310 }
311 } else {
312 if (outerThisStack.head != null &&
313 outerThisStack.head != _sym)
314 visitSymbol(outerThisStack.head);
315 }
316 }
317 }
318
319 /** If tree refers to a class instance creation expression
320 * add all free variables of the freshly created class.
321 */
322 public void visitNewClass(JCNewClass tree) {
323 ClassSymbol c = (ClassSymbol)tree.constructor.owner;
324 if (tree.encl == null &&
325 c.hasOuterInstance() &&
326 outerThisStack.head != null)
327 visitSymbol(outerThisStack.head);
328 super.visitNewClass(tree);
329 }
330
331 /** If tree refers to a qualified this or super expression
332 * for anything but the current class, add the outer this
333 * stack as a free variable.
334 */
335 public void visitSelect(JCFieldAccess tree) {
336 if ((tree.name == names._this || tree.name == names._super) &&
337 tree.selected.type.tsym != clazz &&
338 outerThisStack.head != null)
339 visitSymbol(outerThisStack.head);
340 super.visitSelect(tree);
341 }
342
343 /** If tree refers to a superclass constructor call,
344 * add all free variables of the superclass.
345 */
346 public void visitApply(JCMethodInvocation tree) {
347 if (TreeInfo.name(tree.meth) == names._super) {
348 Symbol constructor = TreeInfo.symbol(tree.meth);
349 ClassSymbol c = (ClassSymbol)constructor.owner;
350 if (c.hasOuterInstance() &&
351 !tree.meth.hasTag(SELECT) &&
352 outerThisStack.head != null)
353 visitSymbol(outerThisStack.head);
354 }
355 super.visitApply(tree);
356 }
357 }
358
359 /** Return the variables accessed from within a local class, which
360 * are declared in the local class' owner.
361 * (in reverse order of first access).
362 */
363 List<VarSymbol> freevars(ClassSymbol c) {
364 if ((c.owner.kind & (VAR | MTH)) != 0) {
365 List<VarSymbol> fvs = freevarCache.get(c);
366 if (fvs == null) {
367 FreeVarCollector collector = new FreeVarCollector(c);
368 collector.scan(classDef(c));
369 fvs = collector.fvs;
370 freevarCache.put(c, fvs);
371 }
372 return fvs;
373 } else {
374 return List.nil();
375 }
376 }
377
378 Map<TypeSymbol,EnumMapping> enumSwitchMap = new LinkedHashMap<TypeSymbol,EnumMapping>();
379
380 EnumMapping mapForEnum(DiagnosticPosition pos, TypeSymbol enumClass) {
381 EnumMapping map = enumSwitchMap.get(enumClass);
382 if (map == null)
383 enumSwitchMap.put(enumClass, map = new EnumMapping(pos, enumClass));
384 return map;
385 }
386
387 /** This map gives a translation table to be used for enum
388 * switches.
389 *
390 * <p>For each enum that appears as the type of a switch
391 * expression, we maintain an EnumMapping to assist in the
392 * translation, as exemplified by the following example:
393 *
394 * <p>we translate
395 * <pre>
396 * switch(colorExpression) {
397 * case red: stmt1;
398 * case green: stmt2;
399 * }
400 * </pre>
401 * into
402 * <pre>
403 * switch(Outer$0.$EnumMap$Color[colorExpression.ordinal()]) {
404 * case 1: stmt1;
405 * case 2: stmt2
406 * }
407 * </pre>
408 * with the auxiliary table initialized as follows:
409 * <pre>
410 * class Outer$0 {
411 * synthetic final int[] $EnumMap$Color = new int[Color.values().length];
412 * static {
413 * try { $EnumMap$Color[red.ordinal()] = 1; } catch (NoSuchFieldError ex) {}
414 * try { $EnumMap$Color[green.ordinal()] = 2; } catch (NoSuchFieldError ex) {}
415 * }
416 * }
417 * </pre>
418 * class EnumMapping provides mapping data and support methods for this translation.
419 */
420 class EnumMapping {
421 EnumMapping(DiagnosticPosition pos, TypeSymbol forEnum) {
422 this.forEnum = forEnum;
423 this.values = new LinkedHashMap<VarSymbol,Integer>();
424 this.pos = pos;
425 Name varName = names
426 .fromString(target.syntheticNameChar() +
427 "SwitchMap" +
428 target.syntheticNameChar() +
429 writer.xClassName(forEnum.type).toString()
430 .replace('/', '.')
431 .replace('.', target.syntheticNameChar()));
432 ClassSymbol outerCacheClass = outerCacheClass();
433 this.mapVar = new VarSymbol(STATIC | SYNTHETIC | FINAL,
434 varName,
435 new ArrayType(syms.intType, syms.arrayClass),
436 outerCacheClass);
437 enterSynthetic(pos, mapVar, outerCacheClass.members());
438 }
439
440 DiagnosticPosition pos = null;
441
442 // the next value to use
443 int next = 1; // 0 (unused map elements) go to the default label
444
445 // the enum for which this is a map
446 final TypeSymbol forEnum;
447
448 // the field containing the map
449 final VarSymbol mapVar;
450
451 // the mapped values
452 final Map<VarSymbol,Integer> values;
453
454 JCLiteral forConstant(VarSymbol v) {
455 Integer result = values.get(v);
456 if (result == null)
457 values.put(v, result = next++);
458 return make.Literal(result);
459 }
460
461 // generate the field initializer for the map
462 void translate() {
463 make.at(pos.getStartPosition());
464 JCClassDecl owner = classDef((ClassSymbol)mapVar.owner);
465
466 // synthetic static final int[] $SwitchMap$Color = new int[Color.values().length];
467 MethodSymbol valuesMethod = lookupMethod(pos,
468 names.values,
469 forEnum.type,
470 List.<Type>nil());
471 JCExpression size = make // Color.values().length
472 .Select(make.App(make.QualIdent(valuesMethod)),
473 syms.lengthVar);
474 JCExpression mapVarInit = make
475 .NewArray(make.Type(syms.intType), List.of(size), null)
476 .setType(new ArrayType(syms.intType, syms.arrayClass));
477
478 // try { $SwitchMap$Color[red.ordinal()] = 1; } catch (java.lang.NoSuchFieldError ex) {}
479 ListBuffer<JCStatement> stmts = new ListBuffer<JCStatement>();
480 Symbol ordinalMethod = lookupMethod(pos,
481 names.ordinal,
482 forEnum.type,
483 List.<Type>nil());
484 List<JCCatch> catcher = List.<JCCatch>nil()
485 .prepend(make.Catch(make.VarDef(new VarSymbol(PARAMETER, names.ex,
486 syms.noSuchFieldErrorType,
487 syms.noSymbol),
488 null),
489 make.Block(0, List.<JCStatement>nil())));
490 for (Map.Entry<VarSymbol,Integer> e : values.entrySet()) {
491 VarSymbol enumerator = e.getKey();
492 Integer mappedValue = e.getValue();
493 JCExpression assign = make
494 .Assign(make.Indexed(mapVar,
495 make.App(make.Select(make.QualIdent(enumerator),
496 ordinalMethod))),
497 make.Literal(mappedValue))
498 .setType(syms.intType);
499 JCStatement exec = make.Exec(assign);
500 JCStatement _try = make.Try(make.Block(0, List.of(exec)), catcher, null);
501 stmts.append(_try);
502 }
503
504 owner.defs = owner.defs
505 .prepend(make.Block(STATIC, stmts.toList()))
506 .prepend(make.VarDef(mapVar, mapVarInit));
507 }
508 }
509
510
511 /**************************************************************************
512 * Tree building blocks
513 *************************************************************************/
514
515 /** Equivalent to make.at(pos.getStartPosition()) with side effect of caching
516 * pos as make_pos, for use in diagnostics.
517 **/
518 TreeMaker make_at(DiagnosticPosition pos) {
519 make_pos = pos;
520 return make.at(pos);
521 }
522
523 /** Make an attributed tree representing a literal. This will be an
524 * Ident node in the case of boolean literals, a Literal node in all
525 * other cases.
526 * @param type The literal's type.
527 * @param value The literal's value.
528 */
529 JCExpression makeLit(Type type, Object value) {
530 return make.Literal(type.getTag(), value).setType(type.constType(value));
531 }
532
533 /** Make an attributed tree representing null.
534 */
535 JCExpression makeNull() {
536 return makeLit(syms.botType, null);
537 }
538
539 /** Make an attributed class instance creation expression.
540 * @param ctype The class type.
541 * @param args The constructor arguments.
542 */
543 JCNewClass makeNewClass(Type ctype, List<JCExpression> args) {
544 JCNewClass tree = make.NewClass(null,
545 null, make.QualIdent(ctype.tsym), args, null);
546 tree.constructor = rs.resolveConstructor(
547 make_pos, attrEnv, ctype, TreeInfo.types(args), List.<Type>nil());
548 tree.type = ctype;
549 return tree;
550 }
551
552 /** Make an attributed unary expression.
553 * @param optag The operators tree tag.
554 * @param arg The operator's argument.
555 */
556 JCUnary makeUnary(JCTree.Tag optag, JCExpression arg) {
557 JCUnary tree = make.Unary(optag, arg);
558 tree.operator = rs.resolveUnaryOperator(
559 make_pos, optag, attrEnv, arg.type);
560 tree.type = tree.operator.type.getReturnType();
561 return tree;
562 }
563
564 /** Make an attributed binary expression.
565 * @param optag The operators tree tag.
566 * @param lhs The operator's left argument.
567 * @param rhs The operator's right argument.
568 */
569 JCBinary makeBinary(JCTree.Tag optag, JCExpression lhs, JCExpression rhs) {
570 JCBinary tree = make.Binary(optag, lhs, rhs);
571 tree.operator = rs.resolveBinaryOperator(
572 make_pos, optag, attrEnv, lhs.type, rhs.type);
573 tree.type = tree.operator.type.getReturnType();
574 return tree;
575 }
576
577 /** Make an attributed assignop expression.
578 * @param optag The operators tree tag.
579 * @param lhs The operator's left argument.
580 * @param rhs The operator's right argument.
581 */
582 JCAssignOp makeAssignop(JCTree.Tag optag, JCTree lhs, JCTree rhs) {
583 JCAssignOp tree = make.Assignop(optag, lhs, rhs);
584 tree.operator = rs.resolveBinaryOperator(
585 make_pos, tree.getTag().noAssignOp(), attrEnv, lhs.type, rhs.type);
586 tree.type = lhs.type;
587 return tree;
588 }
589
590 /** Convert tree into string object, unless it has already a
591 * reference type..
592 */
593 JCExpression makeString(JCExpression tree) {
594 if (!tree.type.isPrimitiveOrVoid()) {
595 return tree;
596 } else {
597 Symbol valueOfSym = lookupMethod(tree.pos(),
598 names.valueOf,
599 syms.stringType,
600 List.of(tree.type));
601 return make.App(make.QualIdent(valueOfSym), List.of(tree));
602 }
603 }
604
605 /** Create an empty anonymous class definition and enter and complete
606 * its symbol. Return the class definition's symbol.
607 * and create
608 * @param flags The class symbol's flags
609 * @param owner The class symbol's owner
610 */
611 JCClassDecl makeEmptyClass(long flags, ClassSymbol owner) {
612 return makeEmptyClass(flags, owner, null, true);
613 }
614
615 JCClassDecl makeEmptyClass(long flags, ClassSymbol owner, Name flatname,
616 boolean addToDefs) {
617 // Create class symbol.
618 ClassSymbol c = reader.defineClass(names.empty, owner);
619 if (flatname != null) {
620 c.flatname = flatname;
621 } else {
622 c.flatname = chk.localClassName(c);
623 }
624 c.sourcefile = owner.sourcefile;
625 c.completer = null;
626 c.members_field = new Scope(c);
627 c.flags_field = flags;
628 ClassType ctype = (ClassType) c.type;
629 ctype.supertype_field = syms.objectType;
630 ctype.interfaces_field = List.nil();
631
632 JCClassDecl odef = classDef(owner);
633
634 // Enter class symbol in owner scope and compiled table.
635 enterSynthetic(odef.pos(), c, owner.members());
636 chk.compiled.put(c.flatname, c);
637
638 // Create class definition tree.
639 JCClassDecl cdef = make.ClassDef(
640 make.Modifiers(flags), names.empty,
641 List.<JCTypeParameter>nil(),
642 null, List.<JCExpression>nil(), List.<JCTree>nil());
643 cdef.sym = c;
644 cdef.type = c.type;
645
646 // Append class definition tree to owner's definitions.
647 if (addToDefs) odef.defs = odef.defs.prepend(cdef);
648 return cdef;
649 }
650
651 /**************************************************************************
652 * Symbol manipulation utilities
653 *************************************************************************/
654
655 /** Enter a synthetic symbol in a given scope, but complain if there was already one there.
656 * @param pos Position for error reporting.
657 * @param sym The symbol.
658 * @param s The scope.
659 */
660 private void enterSynthetic(DiagnosticPosition pos, Symbol sym, Scope s) {
661 s.enter(sym);
662 }
663
664 /** Create a fresh synthetic name within a given scope - the unique name is
665 * obtained by appending '$' chars at the end of the name until no match
666 * is found.
667 *
668 * @param name base name
669 * @param s scope in which the name has to be unique
670 * @return fresh synthetic name
671 */
672 private Name makeSyntheticName(Name name, Scope s) {
673 do {
674 name = name.append(
675 target.syntheticNameChar(),
676 names.empty);
677 } while (lookupSynthetic(name, s) != null);
678 return name;
679 }
680
681 /** Check whether synthetic symbols generated during lowering conflict
682 * with user-defined symbols.
683 *
684 * @param translatedTrees lowered class trees
685 */
686 void checkConflicts(List<JCTree> translatedTrees) {
687 for (JCTree t : translatedTrees) {
688 t.accept(conflictsChecker);
689 }
690 }
691
692 JCTree.Visitor conflictsChecker = new TreeScanner() {
693
694 TypeSymbol currentClass;
695
696 @Override
697 public void visitMethodDef(JCMethodDecl that) {
698 chk.checkConflicts(that.pos(), that.sym, currentClass);
699 super.visitMethodDef(that);
700 }
701
702 @Override
703 public void visitVarDef(JCVariableDecl that) {
704 if (that.sym.owner.kind == TYP) {
705 chk.checkConflicts(that.pos(), that.sym, currentClass);
706 }
707 super.visitVarDef(that);
708 }
709
710 @Override
711 public void visitClassDef(JCClassDecl that) {
712 TypeSymbol prevCurrentClass = currentClass;
713 currentClass = that.sym;
714 try {
715 super.visitClassDef(that);
716 }
717 finally {
718 currentClass = prevCurrentClass;
719 }
720 }
721 };
722
723 /** Look up a synthetic name in a given scope.
724 * @param s The scope.
725 * @param name The name.
726 */
727 private Symbol lookupSynthetic(Name name, Scope s) {
728 Symbol sym = s.lookup(name).sym;
729 return (sym==null || (sym.flags()&SYNTHETIC)==0) ? null : sym;
730 }
731
732 /** Look up a method in a given scope.
733 */
734 private MethodSymbol lookupMethod(DiagnosticPosition pos, Name name, Type qual, List<Type> args) {
735 return rs.resolveInternalMethod(pos, attrEnv, qual, name, args, List.<Type>nil());
736 }
737
738 /** Look up a constructor.
739 */
740 private MethodSymbol lookupConstructor(DiagnosticPosition pos, Type qual, List<Type> args) {
741 return rs.resolveInternalConstructor(pos, attrEnv, qual, args, null);
742 }
743
744 /** Look up a field.
745 */
746 private VarSymbol lookupField(DiagnosticPosition pos, Type qual, Name name) {
747 return rs.resolveInternalField(pos, attrEnv, qual, name);
748 }
749
750 /** Anon inner classes are used as access constructor tags.
751 * accessConstructorTag will use an existing anon class if one is available,
752 * and synthethise a class (with makeEmptyClass) if one is not available.
753 * However, there is a small possibility that an existing class will not
754 * be generated as expected if it is inside a conditional with a constant
755 * expression. If that is found to be the case, create an empty class tree here.
756 */
757 private void checkAccessConstructorTags() {
758 for (List<ClassSymbol> l = accessConstrTags; l.nonEmpty(); l = l.tail) {
759 ClassSymbol c = l.head;
760 if (isTranslatedClassAvailable(c))
761 continue;
762 // Create class definition tree.
763 JCClassDecl cdec = makeEmptyClass(STATIC | SYNTHETIC,
764 c.outermostClass(), c.flatname, false);
765 swapAccessConstructorTag(c, cdec.sym);
766 translated.append(cdec);
767 }
768 }
769 // where
770 private boolean isTranslatedClassAvailable(ClassSymbol c) {
771 for (JCTree tree: translated) {
772 if (tree.hasTag(CLASSDEF)
773 && ((JCClassDecl) tree).sym == c) {
774 return true;
775 }
776 }
777 return false;
778 }
779
780 void swapAccessConstructorTag(ClassSymbol oldCTag, ClassSymbol newCTag) {
781 for (MethodSymbol methodSymbol : accessConstrs.values()) {
782 Assert.check(methodSymbol.type.hasTag(METHOD));
783 MethodType oldMethodType =
784 (MethodType)methodSymbol.type;
785 if (oldMethodType.argtypes.head.tsym == oldCTag)
786 methodSymbol.type =
787 types.createMethodTypeWithParameters(oldMethodType,
788 oldMethodType.getParameterTypes().tail
789 .prepend(newCTag.erasure(types)));
790 }
791 }
792
793 /**************************************************************************
794 * Access methods
795 *************************************************************************/
796
797 /** Access codes for dereferencing, assignment,
798 * and pre/post increment/decrement.
799 * Access codes for assignment operations are determined by method accessCode
800 * below.
801 *
802 * All access codes for accesses to the current class are even.
803 * If a member of the superclass should be accessed instead (because
804 * access was via a qualified super), add one to the corresponding code
805 * for the current class, making the number odd.
806 * This numbering scheme is used by the backend to decide whether
807 * to issue an invokevirtual or invokespecial call.
808 *
809 * @see Gen#visitSelect(JCFieldAccess tree)
810 */
811 private static final int
812 DEREFcode = 0,
813 ASSIGNcode = 2,
814 PREINCcode = 4,
815 PREDECcode = 6,
816 POSTINCcode = 8,
817 POSTDECcode = 10,
818 FIRSTASGOPcode = 12;
819
820 /** Number of access codes
821 */
822 private static final int NCODES = accessCode(ByteCodes.lushrl) + 2;
823
824 /** A mapping from symbols to their access numbers.
825 */
826 private Map<Symbol,Integer> accessNums;
827
828 /** A mapping from symbols to an array of access symbols, indexed by
829 * access code.
830 */
831 private Map<Symbol,MethodSymbol[]> accessSyms;
832
833 /** A mapping from (constructor) symbols to access constructor symbols.
834 */
835 private Map<Symbol,MethodSymbol> accessConstrs;
836
837 /** A list of all class symbols used for access constructor tags.
838 */
839 private List<ClassSymbol> accessConstrTags;
840
841 /** A queue for all accessed symbols.
842 */
843 private ListBuffer<Symbol> accessed;
844
845 /** Map bytecode of binary operation to access code of corresponding
846 * assignment operation. This is always an even number.
847 */
848 private static int accessCode(int bytecode) {
849 if (ByteCodes.iadd <= bytecode && bytecode <= ByteCodes.lxor)
850 return (bytecode - iadd) * 2 + FIRSTASGOPcode;
851 else if (bytecode == ByteCodes.string_add)
852 return (ByteCodes.lxor + 1 - iadd) * 2 + FIRSTASGOPcode;
853 else if (ByteCodes.ishll <= bytecode && bytecode <= ByteCodes.lushrl)
854 return (bytecode - ishll + ByteCodes.lxor + 2 - iadd) * 2 + FIRSTASGOPcode;
855 else
856 return -1;
857 }
858
859 /** return access code for identifier,
860 * @param tree The tree representing the identifier use.
861 * @param enclOp The closest enclosing operation node of tree,
862 * null if tree is not a subtree of an operation.
863 */
864 private static int accessCode(JCTree tree, JCTree enclOp) {
865 if (enclOp == null)
866 return DEREFcode;
867 else if (enclOp.hasTag(ASSIGN) &&
868 tree == TreeInfo.skipParens(((JCAssign) enclOp).lhs))
869 return ASSIGNcode;
870 else if (enclOp.getTag().isIncOrDecUnaryOp() &&
871 tree == TreeInfo.skipParens(((JCUnary) enclOp).arg))
872 return mapTagToUnaryOpCode(enclOp.getTag());
873 else if (enclOp.getTag().isAssignop() &&
874 tree == TreeInfo.skipParens(((JCAssignOp) enclOp).lhs))
875 return accessCode(((OperatorSymbol) ((JCAssignOp) enclOp).operator).opcode);
876 else
877 return DEREFcode;
878 }
879
880 /** Return binary operator that corresponds to given access code.
881 */
882 private OperatorSymbol binaryAccessOperator(int acode) {
883 for (Scope.Entry e = syms.predefClass.members().elems;
884 e != null;
885 e = e.sibling) {
886 if (e.sym instanceof OperatorSymbol) {
887 OperatorSymbol op = (OperatorSymbol)e.sym;
888 if (accessCode(op.opcode) == acode) return op;
889 }
890 }
891 return null;
892 }
893
894 /** Return tree tag for assignment operation corresponding
895 * to given binary operator.
896 */
897 private static JCTree.Tag treeTag(OperatorSymbol operator) {
898 switch (operator.opcode) {
899 case ByteCodes.ior: case ByteCodes.lor:
900 return BITOR_ASG;
901 case ByteCodes.ixor: case ByteCodes.lxor:
902 return BITXOR_ASG;
903 case ByteCodes.iand: case ByteCodes.land:
904 return BITAND_ASG;
905 case ByteCodes.ishl: case ByteCodes.lshl:
906 case ByteCodes.ishll: case ByteCodes.lshll:
907 return SL_ASG;
908 case ByteCodes.ishr: case ByteCodes.lshr:
909 case ByteCodes.ishrl: case ByteCodes.lshrl:
910 return SR_ASG;
911 case ByteCodes.iushr: case ByteCodes.lushr:
912 case ByteCodes.iushrl: case ByteCodes.lushrl:
913 return USR_ASG;
914 case ByteCodes.iadd: case ByteCodes.ladd:
915 case ByteCodes.fadd: case ByteCodes.dadd:
916 case ByteCodes.string_add:
917 return PLUS_ASG;
918 case ByteCodes.isub: case ByteCodes.lsub:
919 case ByteCodes.fsub: case ByteCodes.dsub:
920 return MINUS_ASG;
921 case ByteCodes.imul: case ByteCodes.lmul:
922 case ByteCodes.fmul: case ByteCodes.dmul:
923 return MUL_ASG;
924 case ByteCodes.idiv: case ByteCodes.ldiv:
925 case ByteCodes.fdiv: case ByteCodes.ddiv:
926 return DIV_ASG;
927 case ByteCodes.imod: case ByteCodes.lmod:
928 case ByteCodes.fmod: case ByteCodes.dmod:
929 return MOD_ASG;
930 default:
931 throw new AssertionError();
932 }
933 }
934
935 /** The name of the access method with number `anum' and access code `acode'.
936 */
937 Name accessName(int anum, int acode) {
938 return names.fromString(
939 "access" + target.syntheticNameChar() + anum + acode / 10 + acode % 10);
940 }
941
942 /** Return access symbol for a private or protected symbol from an inner class.
943 * @param sym The accessed private symbol.
944 * @param tree The accessing tree.
945 * @param enclOp The closest enclosing operation node of tree,
946 * null if tree is not a subtree of an operation.
947 * @param protAccess Is access to a protected symbol in another
948 * package?
949 * @param refSuper Is access via a (qualified) C.super?
950 */
951 MethodSymbol accessSymbol(Symbol sym, JCTree tree, JCTree enclOp,
952 boolean protAccess, boolean refSuper) {
953 ClassSymbol accOwner = refSuper && protAccess
954 // For access via qualified super (T.super.x), place the
955 // access symbol on T.
956 ? (ClassSymbol)((JCFieldAccess) tree).selected.type.tsym
957 // Otherwise pretend that the owner of an accessed
958 // protected symbol is the enclosing class of the current
959 // class which is a subclass of the symbol's owner.
960 : accessClass(sym, protAccess, tree);
961
962 Symbol vsym = sym;
963 if (sym.owner != accOwner) {
964 vsym = sym.clone(accOwner);
965 actualSymbols.put(vsym, sym);
966 }
967
968 Integer anum // The access number of the access method.
969 = accessNums.get(vsym);
970 if (anum == null) {
971 anum = accessed.length();
972 accessNums.put(vsym, anum);
973 accessSyms.put(vsym, new MethodSymbol[NCODES]);
974 accessed.append(vsym);
975 // System.out.println("accessing " + vsym + " in " + vsym.location());
976 }
977
978 int acode; // The access code of the access method.
979 List<Type> argtypes; // The argument types of the access method.
980 Type restype; // The result type of the access method.
981 List<Type> thrown; // The thrown exceptions of the access method.
982 switch (vsym.kind) {
983 case VAR:
984 acode = accessCode(tree, enclOp);
985 if (acode >= FIRSTASGOPcode) {
986 OperatorSymbol operator = binaryAccessOperator(acode);
987 if (operator.opcode == string_add)
988 argtypes = List.of(syms.objectType);
989 else
990 argtypes = operator.type.getParameterTypes().tail;
991 } else if (acode == ASSIGNcode)
992 argtypes = List.of(vsym.erasure(types));
993 else
994 argtypes = List.nil();
995 restype = vsym.erasure(types);
996 thrown = List.nil();
997 break;
998 case MTH:
999 acode = DEREFcode;
1000 argtypes = vsym.erasure(types).getParameterTypes();
1001 restype = vsym.erasure(types).getReturnType();
1002 thrown = vsym.type.getThrownTypes();
1003 break;
1004 default:
1005 throw new AssertionError();
1006 }
1007
1008 // For references via qualified super, increment acode by one,
1009 // making it odd.
1010 if (protAccess && refSuper) acode++;
1011
1012 // Instance access methods get instance as first parameter.
1013 // For protected symbols this needs to be the instance as a member
1014 // of the type containing the accessed symbol, not the class
1015 // containing the access method.
1016 if ((vsym.flags() & STATIC) == 0) {
1017 argtypes = argtypes.prepend(vsym.owner.erasure(types));
1018 }
1019 MethodSymbol[] accessors = accessSyms.get(vsym);
1020 MethodSymbol accessor = accessors[acode];
1021 if (accessor == null) {
1022 accessor = new MethodSymbol(
1023 STATIC | SYNTHETIC,
1024 accessName(anum.intValue(), acode),
1025 new MethodType(argtypes, restype, thrown, syms.methodClass),
1026 accOwner);
1027 enterSynthetic(tree.pos(), accessor, accOwner.members());
1028 accessors[acode] = accessor;
1029 }
1030 return accessor;
1031 }
1032
1033 /** The qualifier to be used for accessing a symbol in an outer class.
1034 * This is either C.sym or C.this.sym, depending on whether or not
1035 * sym is static.
1036 * @param sym The accessed symbol.
1037 */
1038 JCExpression accessBase(DiagnosticPosition pos, Symbol sym) {
1039 return (sym.flags() & STATIC) != 0
1040 ? access(make.at(pos.getStartPosition()).QualIdent(sym.owner))
1041 : makeOwnerThis(pos, sym, true);
1042 }
1043
1044 /** Do we need an access method to reference private symbol?
1045 */
1046 boolean needsPrivateAccess(Symbol sym) {
1047 if ((sym.flags() & PRIVATE) == 0 || sym.owner == currentClass) {
1048 return false;
1049 } else if (sym.name == names.init && (sym.owner.owner.kind & (VAR | MTH)) != 0) {
1050 // private constructor in local class: relax protection
1051 sym.flags_field &= ~PRIVATE;
1052 return false;
1053 } else {
1054 return true;
1055 }
1056 }
1057
1058 /** Do we need an access method to reference symbol in other package?
1059 */
1060 boolean needsProtectedAccess(Symbol sym, JCTree tree) {
1061 if ((sym.flags() & PROTECTED) == 0 ||
1062 sym.owner.owner == currentClass.owner || // fast special case
1063 sym.packge() == currentClass.packge())
1064 return false;
1065 if (!currentClass.isSubClass(sym.owner, types))
1066 return true;
1067 if ((sym.flags() & STATIC) != 0 ||
1068 !tree.hasTag(SELECT) ||
1069 TreeInfo.name(((JCFieldAccess) tree).selected) == names._super)
1070 return false;
1071 return !((JCFieldAccess) tree).selected.type.tsym.isSubClass(currentClass, types);
1072 }
1073
1074 /** The class in which an access method for given symbol goes.
1075 * @param sym The access symbol
1076 * @param protAccess Is access to a protected symbol in another
1077 * package?
1078 */
1079 ClassSymbol accessClass(Symbol sym, boolean protAccess, JCTree tree) {
1080 if (protAccess) {
1081 Symbol qualifier = null;
1082 ClassSymbol c = currentClass;
1083 if (tree.hasTag(SELECT) && (sym.flags() & STATIC) == 0) {
1084 qualifier = ((JCFieldAccess) tree).selected.type.tsym;
1085 while (!qualifier.isSubClass(c, types)) {
1086 c = c.owner.enclClass();
1087 }
1088 return c;
1089 } else {
1090 while (!c.isSubClass(sym.owner, types)) {
1091 c = c.owner.enclClass();
1092 }
1093 }
1094 return c;
1095 } else {
1096 // the symbol is private
1097 return sym.owner.enclClass();
1098 }
1099 }
1100
1101 private void addPrunedInfo(JCTree tree) {
1102 List<JCTree> infoList = prunedTree.get(currentClass);
1103 infoList = (infoList == null) ? List.of(tree) : infoList.prepend(tree);
1104 prunedTree.put(currentClass, infoList);
1105 }
1106
1107 /** Ensure that identifier is accessible, return tree accessing the identifier.
1108 * @param sym The accessed symbol.
1109 * @param tree The tree referring to the symbol.
1110 * @param enclOp The closest enclosing operation node of tree,
1111 * null if tree is not a subtree of an operation.
1112 * @param refSuper Is access via a (qualified) C.super?
1113 */
1114 JCExpression access(Symbol sym, JCExpression tree, JCExpression enclOp, boolean refSuper) {
1115 // Access a free variable via its proxy, or its proxy's proxy
1116 while (sym.kind == VAR && sym.owner.kind == MTH &&
1117 sym.owner.enclClass() != currentClass) {
1118 // A constant is replaced by its constant value.
1119 Object cv = ((VarSymbol)sym).getConstValue();
1120 if (cv != null) {
1121 make.at(tree.pos);
1122 return makeLit(sym.type, cv);
1123 }
1124 // Otherwise replace the variable by its proxy.
1125 sym = proxies.lookup(proxyName(sym.name)).sym;
1126 Assert.check(sym != null && (sym.flags_field & FINAL) != 0);
1127 tree = make.at(tree.pos).Ident(sym);
1128 }
1129 JCExpression base = (tree.hasTag(SELECT)) ? ((JCFieldAccess) tree).selected : null;
1130 switch (sym.kind) {
1131 case TYP:
1132 if (sym.owner.kind != PCK) {
1133 // Convert type idents to
1134 // <flat name> or <package name> . <flat name>
1135 Name flatname = Convert.shortName(sym.flatName());
1136 while (base != null &&
1137 TreeInfo.symbol(base) != null &&
1138 TreeInfo.symbol(base).kind != PCK) {
1139 base = (base.hasTag(SELECT))
1140 ? ((JCFieldAccess) base).selected
1141 : null;
1142 }
1143 if (tree.hasTag(IDENT)) {
1144 ((JCIdent) tree).name = flatname;
1145 } else if (base == null) {
1146 tree = make.at(tree.pos).Ident(sym);
1147 ((JCIdent) tree).name = flatname;
1148 } else {
1149 ((JCFieldAccess) tree).selected = base;
1150 ((JCFieldAccess) tree).name = flatname;
1151 }
1152 }
1153 break;
1154 case MTH: case VAR:
1155 if (sym.owner.kind == TYP) {
1156
1157 // Access methods are required for
1158 // - private members,
1159 // - protected members in a superclass of an
1160 // enclosing class contained in another package.
1161 // - all non-private members accessed via a qualified super.
1162 boolean protAccess = refSuper && !needsPrivateAccess(sym)
1163 || needsProtectedAccess(sym, tree);
1164 boolean accReq = protAccess || needsPrivateAccess(sym);
1165
1166 // A base has to be supplied for
1167 // - simple identifiers accessing variables in outer classes.
1168 boolean baseReq =
1169 base == null &&
1170 sym.owner != syms.predefClass &&
1171 !sym.isMemberOf(currentClass, types);
1172
1173 if (accReq || baseReq) {
1174 make.at(tree.pos);
1175
1176 // Constants are replaced by their constant value.
1177 if (sym.kind == VAR) {
1178 Object cv = ((VarSymbol)sym).getConstValue();
1179 if (cv != null) {
1180 addPrunedInfo(tree);
1181 return makeLit(sym.type, cv);
1182 }
1183 }
1184
1185 // Private variables and methods are replaced by calls
1186 // to their access methods.
1187 if (accReq) {
1188 List<JCExpression> args = List.nil();
1189 if ((sym.flags() & STATIC) == 0) {
1190 // Instance access methods get instance
1191 // as first parameter.
1192 if (base == null)
1193 base = makeOwnerThis(tree.pos(), sym, true);
1194 args = args.prepend(base);
1195 base = null; // so we don't duplicate code
1196 }
1197 Symbol access = accessSymbol(sym, tree,
1198 enclOp, protAccess,
1199 refSuper);
1200 JCExpression receiver = make.Select(
1201 base != null ? base : make.QualIdent(access.owner),
1202 access);
1203 return make.App(receiver, args);
1204
1205 // Other accesses to members of outer classes get a
1206 // qualifier.
1207 } else if (baseReq) {
1208 return make.at(tree.pos).Select(
1209 accessBase(tree.pos(), sym), sym).setType(tree.type);
1210 }
1211 }
1212 } else if (sym.owner.kind == MTH && lambdaTranslationMap != null) {
1213 //sym is a local variable - check the lambda translation map to
1214 //see if sym has been translated to something else in the current
1215 //scope (by LambdaToMethod)
1216 Symbol translatedSym = lambdaTranslationMap.get(sym);
1217 if (translatedSym != null) {
1218 tree = make.at(tree.pos).Ident(translatedSym);
1219 }
1220 }
1221 }
1222 return tree;
1223 }
1224
1225 /** Ensure that identifier is accessible, return tree accessing the identifier.
1226 * @param tree The identifier tree.
1227 */
1228 JCExpression access(JCExpression tree) {
1229 Symbol sym = TreeInfo.symbol(tree);
1230 return sym == null ? tree : access(sym, tree, null, false);
1231 }
1232
1233 /** Return access constructor for a private constructor,
1234 * or the constructor itself, if no access constructor is needed.
1235 * @param pos The position to report diagnostics, if any.
1236 * @param constr The private constructor.
1237 */
1238 Symbol accessConstructor(DiagnosticPosition pos, Symbol constr) {
1239 if (needsPrivateAccess(constr)) {
1240 ClassSymbol accOwner = constr.owner.enclClass();
1241 MethodSymbol aconstr = accessConstrs.get(constr);
1242 if (aconstr == null) {
1243 List<Type> argtypes = constr.type.getParameterTypes();
1244 if ((accOwner.flags_field & ENUM) != 0)
1245 argtypes = argtypes
1246 .prepend(syms.intType)
1247 .prepend(syms.stringType);
1248 aconstr = new MethodSymbol(
1249 SYNTHETIC,
1250 names.init,
1251 new MethodType(
1252 argtypes.append(
1253 accessConstructorTag().erasure(types)),
1254 constr.type.getReturnType(),
1255 constr.type.getThrownTypes(),
1256 syms.methodClass),
1257 accOwner);
1258 enterSynthetic(pos, aconstr, accOwner.members());
1259 accessConstrs.put(constr, aconstr);
1260 accessed.append(constr);
1261 }
1262 return aconstr;
1263 } else {
1264 return constr;
1265 }
1266 }
1267
1268 /** Return an anonymous class nested in this toplevel class.
1269 */
1270 ClassSymbol accessConstructorTag() {
1271 ClassSymbol topClass = currentClass.outermostClass();
1272 Name flatname = names.fromString("" + topClass.getQualifiedName() +
1273 target.syntheticNameChar() +
1274 "1");
1275 ClassSymbol ctag = chk.compiled.get(flatname);
1276 if (ctag == null)
1277 ctag = makeEmptyClass(STATIC | SYNTHETIC, topClass).sym;
1278 // keep a record of all tags, to verify that all are generated as required
1279 accessConstrTags = accessConstrTags.prepend(ctag);
1280 return ctag;
1281 }
1282
1283 /** Add all required access methods for a private symbol to enclosing class.
1284 * @param sym The symbol.
1285 */
1286 void makeAccessible(Symbol sym) {
1287 JCClassDecl cdef = classDef(sym.owner.enclClass());
1288 if (cdef == null) Assert.error("class def not found: " + sym + " in " + sym.owner);
1289 if (sym.name == names.init) {
1290 cdef.defs = cdef.defs.prepend(
1291 accessConstructorDef(cdef.pos, sym, accessConstrs.get(sym)));
1292 } else {
1293 MethodSymbol[] accessors = accessSyms.get(sym);
1294 for (int i = 0; i < NCODES; i++) {
1295 if (accessors[i] != null)
1296 cdef.defs = cdef.defs.prepend(
1297 accessDef(cdef.pos, sym, accessors[i], i));
1298 }
1299 }
1300 }
1301
1302 /** Maps unary operator integer codes to JCTree.Tag objects
1303 * @param unaryOpCode the unary operator code
1304 */
1305 private static Tag mapUnaryOpCodeToTag(int unaryOpCode){
1306 switch (unaryOpCode){
1307 case PREINCcode:
1308 return PREINC;
1309 case PREDECcode:
1310 return PREDEC;
1311 case POSTINCcode:
1312 return POSTINC;
1313 case POSTDECcode:
1314 return POSTDEC;
1315 default:
1316 return NO_TAG;
1317 }
1318 }
1319
1320 /** Maps JCTree.Tag objects to unary operator integer codes
1321 * @param tag the JCTree.Tag
1322 */
1323 private static int mapTagToUnaryOpCode(Tag tag){
1324 switch (tag){
1325 case PREINC:
1326 return PREINCcode;
1327 case PREDEC:
1328 return PREDECcode;
1329 case POSTINC:
1330 return POSTINCcode;
1331 case POSTDEC:
1332 return POSTDECcode;
1333 default:
1334 return -1;
1335 }
1336 }
1337
1338 /** Construct definition of an access method.
1339 * @param pos The source code position of the definition.
1340 * @param vsym The private or protected symbol.
1341 * @param accessor The access method for the symbol.
1342 * @param acode The access code.
1343 */
1344 JCTree accessDef(int pos, Symbol vsym, MethodSymbol accessor, int acode) {
1345 // System.err.println("access " + vsym + " with " + accessor);//DEBUG
1346 currentClass = vsym.owner.enclClass();
1347 make.at(pos);
1348 JCMethodDecl md = make.MethodDef(accessor, null);
1349
1350 // Find actual symbol
1351 Symbol sym = actualSymbols.get(vsym);
1352 if (sym == null) sym = vsym;
1353
1354 JCExpression ref; // The tree referencing the private symbol.
1355 List<JCExpression> args; // Any additional arguments to be passed along.
1356 if ((sym.flags() & STATIC) != 0) {
1357 ref = make.Ident(sym);
1358 args = make.Idents(md.params);
1359 } else {
1360 ref = make.Select(make.Ident(md.params.head), sym);
1361 args = make.Idents(md.params.tail);
1362 }
1363 JCStatement stat; // The statement accessing the private symbol.
1364 if (sym.kind == VAR) {
1365 // Normalize out all odd access codes by taking floor modulo 2:
1366 int acode1 = acode - (acode & 1);
1367
1368 JCExpression expr; // The access method's return value.
1369 switch (acode1) {
1370 case DEREFcode:
1371 expr = ref;
1372 break;
1373 case ASSIGNcode:
1374 expr = make.Assign(ref, args.head);
1375 break;
1376 case PREINCcode: case POSTINCcode: case PREDECcode: case POSTDECcode:
1377 expr = makeUnary(mapUnaryOpCodeToTag(acode1), ref);
1378 break;
1379 default:
1380 expr = make.Assignop(
1381 treeTag(binaryAccessOperator(acode1)), ref, args.head);
1382 ((JCAssignOp) expr).operator = binaryAccessOperator(acode1);
1383 }
1384 stat = make.Return(expr.setType(sym.type));
1385 } else {
1386 stat = make.Call(make.App(ref, args));
1387 }
1388 md.body = make.Block(0, List.of(stat));
1389
1390 // Make sure all parameters, result types and thrown exceptions
1391 // are accessible.
1392 for (List<JCVariableDecl> l = md.params; l.nonEmpty(); l = l.tail)
1393 l.head.vartype = access(l.head.vartype);
1394 md.restype = access(md.restype);
1395 for (List<JCExpression> l = md.thrown; l.nonEmpty(); l = l.tail)
1396 l.head = access(l.head);
1397
1398 return md;
1399 }
1400
1401 /** Construct definition of an access constructor.
1402 * @param pos The source code position of the definition.
1403 * @param constr The private constructor.
1404 * @param accessor The access method for the constructor.
1405 */
1406 JCTree accessConstructorDef(int pos, Symbol constr, MethodSymbol accessor) {
1407 make.at(pos);
1408 JCMethodDecl md = make.MethodDef(accessor,
1409 accessor.externalType(types),
1410 null);
1411 JCIdent callee = make.Ident(names._this);
1412 callee.sym = constr;
1413 callee.type = constr.type;
1414 md.body =
1415 make.Block(0, List.<JCStatement>of(
1416 make.Call(
1417 make.App(
1418 callee,
1419 make.Idents(md.params.reverse().tail.reverse())))));
1420 return md;
1421 }
1422
1423 /**************************************************************************
1424 * Free variables proxies and this$n
1425 *************************************************************************/
1426
1427 /** A scope containing all free variable proxies for currently translated
1428 * class, as well as its this$n symbol (if needed).
1429 * Proxy scopes are nested in the same way classes are.
1430 * Inside a constructor, proxies and any this$n symbol are duplicated
1431 * in an additional innermost scope, where they represent the constructor
1432 * parameters.
1433 */
1434 Scope proxies;
1435
1436 /** A scope containing all unnamed resource variables/saved
1437 * exception variables for translated TWR blocks
1438 */
1439 Scope twrVars;
1440
1441 /** A stack containing the this$n field of the currently translated
1442 * classes (if needed) in innermost first order.
1443 * Inside a constructor, proxies and any this$n symbol are duplicated
1444 * in an additional innermost scope, where they represent the constructor
1445 * parameters.
1446 */
1447 List<VarSymbol> outerThisStack;
1448
1449 /** The name of a free variable proxy.
1450 */
1451 Name proxyName(Name name) {
1452 return names.fromString("val" + target.syntheticNameChar() + name);
1453 }
1454
1455 /** Proxy definitions for all free variables in given list, in reverse order.
1456 * @param pos The source code position of the definition.
1457 * @param freevars The free variables.
1458 * @param owner The class in which the definitions go.
1459 */
1460 List<JCVariableDecl> freevarDefs(int pos, List<VarSymbol> freevars, Symbol owner) {
1461 long flags = FINAL | SYNTHETIC;
1462 if (owner.kind == TYP &&
1463 target.usePrivateSyntheticFields())
1464 flags |= PRIVATE;
1465 List<JCVariableDecl> defs = List.nil();
1466 for (List<VarSymbol> l = freevars; l.nonEmpty(); l = l.tail) {
1467 VarSymbol v = l.head;
1468 VarSymbol proxy = new VarSymbol(
1469 flags, proxyName(v.name), v.erasure(types), owner);
1470 proxies.enter(proxy);
1471 JCVariableDecl vd = make.at(pos).VarDef(proxy, null);
1472 vd.vartype = access(vd.vartype);
1473 defs = defs.prepend(vd);
1474 }
1475 return defs;
1476 }
1477
1478 /** The name of a this$n field
1479 * @param type The class referenced by the this$n field
1480 */
1481 Name outerThisName(Type type, Symbol owner) {
1482 Type t = type.getEnclosingType();
1483 int nestingLevel = 0;
1484 while (t.hasTag(CLASS)) {
1485 t = t.getEnclosingType();
1486 nestingLevel++;
1487 }
1488 Name result = names.fromString("this" + target.syntheticNameChar() + nestingLevel);
1489 while (owner.kind == TYP && ((ClassSymbol)owner).members().lookup(result).scope != null)
1490 result = names.fromString(result.toString() + target.syntheticNameChar());
1491 return result;
1492 }
1493
1494 private VarSymbol makeOuterThisVarSymbol(Symbol owner, long flags) {
1495 if (owner.kind == TYP &&
1496 target.usePrivateSyntheticFields())
1497 flags |= PRIVATE;
1498 Type target = types.erasure(owner.enclClass().type.getEnclosingType());
1499 VarSymbol outerThis =
1500 new VarSymbol(flags, outerThisName(target, owner), target, owner);
1501 outerThisStack = outerThisStack.prepend(outerThis);
1502 return outerThis;
1503 }
1504
1505 private JCVariableDecl makeOuterThisVarDecl(int pos, VarSymbol sym) {
1506 JCVariableDecl vd = make.at(pos).VarDef(sym, null);
1507 vd.vartype = access(vd.vartype);
1508 return vd;
1509 }
1510
1511 /** Definition for this$n field.
1512 * @param pos The source code position of the definition.
1513 * @param owner The method in which the definition goes.
1514 */
1515 JCVariableDecl outerThisDef(int pos, MethodSymbol owner) {
1516 ClassSymbol c = owner.enclClass();
1517 boolean isMandated =
1518 // Anonymous constructors
1519 (owner.isConstructor() && owner.isAnonymous()) ||
1520 // Constructors of non-private inner member classes
1521 (owner.isConstructor() && c.isInner() &&
1522 !c.isPrivate() && !c.isStatic());
1523 long flags =
1524 FINAL | (isMandated ? MANDATED : SYNTHETIC);
1525 VarSymbol outerThis = makeOuterThisVarSymbol(owner, flags);
1526 owner.extraParams = owner.extraParams.prepend(outerThis);
1527 return makeOuterThisVarDecl(pos, outerThis);
1528 }
1529
1530 /** Definition for this$n field.
1531 * @param pos The source code position of the definition.
1532 * @param owner The class in which the definition goes.
1533 */
1534 JCVariableDecl outerThisDef(int pos, ClassSymbol owner) {
1535 VarSymbol outerThis = makeOuterThisVarSymbol(owner, FINAL | SYNTHETIC);
1536 return makeOuterThisVarDecl(pos, outerThis);
1537 }
1538
1539 /** Return a list of trees that load the free variables in given list,
1540 * in reverse order.
1541 * @param pos The source code position to be used for the trees.
1542 * @param freevars The list of free variables.
1543 */
1544 List<JCExpression> loadFreevars(DiagnosticPosition pos, List<VarSymbol> freevars) {
1545 List<JCExpression> args = List.nil();
1546 for (List<VarSymbol> l = freevars; l.nonEmpty(); l = l.tail)
1547 args = args.prepend(loadFreevar(pos, l.head));
1548 return args;
1549 }
1550 //where
1551 JCExpression loadFreevar(DiagnosticPosition pos, VarSymbol v) {
1552 return access(v, make.at(pos).Ident(v), null, false);
1553 }
1554
1555 /** Construct a tree simulating the expression {@code C.this}.
1556 * @param pos The source code position to be used for the tree.
1557 * @param c The qualifier class.
1558 */
1559 JCExpression makeThis(DiagnosticPosition pos, TypeSymbol c) {
1560 if (currentClass == c) {
1561 // in this case, `this' works fine
1562 return make.at(pos).This(c.erasure(types));
1563 } else {
1564 // need to go via this$n
1565 return makeOuterThis(pos, c);
1566 }
1567 }
1568
1569 /**
1570 * Optionally replace a try statement with the desugaring of a
1571 * try-with-resources statement. The canonical desugaring of
1572 *
1573 * try ResourceSpecification
1574 * Block
1575 *
1576 * is
1577 *
1578 * {
1579 * final VariableModifiers_minus_final R #resource = Expression;
1580 * Throwable #primaryException = null;
1581 *
1582 * try ResourceSpecificationtail
1583 * Block
1584 * catch (Throwable #t) {
1585 * #primaryException = t;
1586 * throw #t;
1587 * } finally {
1588 * if (#resource != null) {
1589 * if (#primaryException != null) {
1590 * try {
1591 * #resource.close();
1592 * } catch(Throwable #suppressedException) {
1593 * #primaryException.addSuppressed(#suppressedException);
1594 * }
1595 * } else {
1596 * #resource.close();
1597 * }
1598 * }
1599 * }
1600 *
1601 * @param tree The try statement to inspect.
1602 * @return A a desugared try-with-resources tree, or the original
1603 * try block if there are no resources to manage.
1604 */
1605 JCTree makeTwrTry(JCTry tree) {
1606 make_at(tree.pos());
1607 twrVars = twrVars.dup();
1608 JCBlock twrBlock = makeTwrBlock(tree.resources, tree.body, 0);
1609 if (tree.catchers.isEmpty() && tree.finalizer == null)
1610 result = translate(twrBlock);
1611 else
1612 result = translate(make.Try(twrBlock, tree.catchers, tree.finalizer));
1613 twrVars = twrVars.leave();
1614 return result;
1615 }
1616
1617 private JCBlock makeTwrBlock(List<JCTree> resources, JCBlock block, int depth) {
1618 if (resources.isEmpty())
1619 return block;
1620
1621 // Add resource declaration or expression to block statements
1622 ListBuffer<JCStatement> stats = new ListBuffer<JCStatement>();
1623 JCTree resource = resources.head;
1624 JCExpression expr = null;
1625 if (resource instanceof JCVariableDecl) {
1626 JCVariableDecl var = (JCVariableDecl) resource;
1627 expr = make.Ident(var.sym).setType(resource.type);
1628 stats.add(var);
1629 } else {
1630 Assert.check(resource instanceof JCExpression);
1631 VarSymbol syntheticTwrVar =
1632 new VarSymbol(SYNTHETIC | FINAL,
1633 makeSyntheticName(names.fromString("twrVar" +
1634 depth), twrVars),
1635 (resource.type.hasTag(BOT)) ?
1636 syms.autoCloseableType : resource.type,
1637 currentMethodSym);
1638 twrVars.enter(syntheticTwrVar);
1639 JCVariableDecl syntheticTwrVarDecl =
1640 make.VarDef(syntheticTwrVar, (JCExpression)resource);
1641 expr = (JCExpression)make.Ident(syntheticTwrVar);
1642 stats.add(syntheticTwrVarDecl);
1643 }
1644
1645 // Add primaryException declaration
1646 VarSymbol primaryException =
1647 new VarSymbol(SYNTHETIC,
1648 makeSyntheticName(names.fromString("primaryException" +
1649 depth), twrVars),
1650 syms.throwableType,
1651 currentMethodSym);
1652 twrVars.enter(primaryException);
1653 JCVariableDecl primaryExceptionTreeDecl = make.VarDef(primaryException, makeNull());
1654 stats.add(primaryExceptionTreeDecl);
1655
1656 // Create catch clause that saves exception and then rethrows it
1657 VarSymbol param =
1658 new VarSymbol(FINAL|SYNTHETIC,
1659 names.fromString("t" +
1660 target.syntheticNameChar()),
1661 syms.throwableType,
1662 currentMethodSym);
1663 JCVariableDecl paramTree = make.VarDef(param, null);
1664 JCStatement assign = make.Assignment(primaryException, make.Ident(param));
1665 JCStatement rethrowStat = make.Throw(make.Ident(param));
1666 JCBlock catchBlock = make.Block(0L, List.<JCStatement>of(assign, rethrowStat));
1667 JCCatch catchClause = make.Catch(paramTree, catchBlock);
1668
1669 int oldPos = make.pos;
1670 make.at(TreeInfo.endPos(block));
1671 JCBlock finallyClause = makeTwrFinallyClause(primaryException, expr);
1672 make.at(oldPos);
1673 JCTry outerTry = make.Try(makeTwrBlock(resources.tail, block, depth + 1),
1674 List.<JCCatch>of(catchClause),
1675 finallyClause);
1676 stats.add(outerTry);
1677 return make.Block(0L, stats.toList());
1678 }
1679
1680 private JCBlock makeTwrFinallyClause(Symbol primaryException, JCExpression resource) {
1681 // primaryException.addSuppressed(catchException);
1682 VarSymbol catchException =
1683 new VarSymbol(0, make.paramName(2),
1684 syms.throwableType,
1685 currentMethodSym);
1686 JCStatement addSuppressionStatement =
1687 make.Exec(makeCall(make.Ident(primaryException),
1688 names.addSuppressed,
1689 List.<JCExpression>of(make.Ident(catchException))));
1690
1691 // try { resource.close(); } catch (e) { primaryException.addSuppressed(e); }
1692 JCBlock tryBlock =
1693 make.Block(0L, List.<JCStatement>of(makeResourceCloseInvocation(resource)));
1694 JCVariableDecl catchExceptionDecl = make.VarDef(catchException, null);
1695 JCBlock catchBlock = make.Block(0L, List.<JCStatement>of(addSuppressionStatement));
1696 List<JCCatch> catchClauses = List.<JCCatch>of(make.Catch(catchExceptionDecl, catchBlock));
1697 JCTry tryTree = make.Try(tryBlock, catchClauses, null);
1698
1699 // if (primaryException != null) {try...} else resourceClose;
1700 JCIf closeIfStatement = make.If(makeNonNullCheck(make.Ident(primaryException)),
1701 tryTree,
1702 makeResourceCloseInvocation(resource));
1703
1704 // if (#resource != null) { if (primaryException ... }
1705 return make.Block(0L,
1706 List.<JCStatement>of(make.If(makeNonNullCheck(resource),
1707 closeIfStatement,
1708 null)));
1709 }
1710
1711 private JCStatement makeResourceCloseInvocation(JCExpression resource) {
1712 // convert to AutoCloseable if needed
1713 if (types.asSuper(resource.type, syms.autoCloseableType.tsym) == null) {
1714 resource = (JCExpression) convert(resource, syms.autoCloseableType);
1715 }
1716
1717 // create resource.close() method invocation
1718 JCExpression resourceClose = makeCall(resource,
1719 names.close,
1720 List.<JCExpression>nil());
1721 return make.Exec(resourceClose);
1722 }
1723
1724 private JCExpression makeNonNullCheck(JCExpression expression) {
1725 return makeBinary(NE, expression, makeNull());
1726 }
1727
1728 /** Construct a tree that represents the outer instance
1729 * {@code C.this}. Never pick the current `this'.
1730 * @param pos The source code position to be used for the tree.
1731 * @param c The qualifier class.
1732 */
1733 JCExpression makeOuterThis(DiagnosticPosition pos, TypeSymbol c) {
1734 List<VarSymbol> ots = outerThisStack;
1735 if (ots.isEmpty()) {
1736 log.error(pos, "no.encl.instance.of.type.in.scope", c);
1737 Assert.error();
1738 return makeNull();
1739 }
1740 VarSymbol ot = ots.head;
1741 JCExpression tree = access(make.at(pos).Ident(ot));
1742 TypeSymbol otc = ot.type.tsym;
1743 while (otc != c) {
1744 do {
1745 ots = ots.tail;
1746 if (ots.isEmpty()) {
1747 log.error(pos,
1748 "no.encl.instance.of.type.in.scope",
1749 c);
1750 Assert.error(); // should have been caught in Attr
1751 return tree;
1752 }
1753 ot = ots.head;
1754 } while (ot.owner != otc);
1755 if (otc.owner.kind != PCK && !otc.hasOuterInstance()) {
1756 chk.earlyRefError(pos, c);
1757 Assert.error(); // should have been caught in Attr
1758 return makeNull();
1759 }
1760 tree = access(make.at(pos).Select(tree, ot));
1761 otc = ot.type.tsym;
1762 }
1763 return tree;
1764 }
1765
1766 /** Construct a tree that represents the closest outer instance
1767 * {@code C.this} such that the given symbol is a member of C.
1768 * @param pos The source code position to be used for the tree.
1769 * @param sym The accessed symbol.
1770 * @param preciseMatch should we accept a type that is a subtype of
1771 * sym's owner, even if it doesn't contain sym
1772 * due to hiding, overriding, or non-inheritance
1773 * due to protection?
1774 */
1775 JCExpression makeOwnerThis(DiagnosticPosition pos, Symbol sym, boolean preciseMatch) {
1776 Symbol c = sym.owner;
1777 if (preciseMatch ? sym.isMemberOf(currentClass, types)
1778 : currentClass.isSubClass(sym.owner, types)) {
1779 // in this case, `this' works fine
1780 return make.at(pos).This(c.erasure(types));
1781 } else {
1782 // need to go via this$n
1783 return makeOwnerThisN(pos, sym, preciseMatch);
1784 }
1785 }
1786
1787 /**
1788 * Similar to makeOwnerThis but will never pick "this".
1789 */
1790 JCExpression makeOwnerThisN(DiagnosticPosition pos, Symbol sym, boolean preciseMatch) {
1791 Symbol c = sym.owner;
1792 List<VarSymbol> ots = outerThisStack;
1793 if (ots.isEmpty()) {
1794 log.error(pos, "no.encl.instance.of.type.in.scope", c);
1795 Assert.error();
1796 return makeNull();
1797 }
1798 VarSymbol ot = ots.head;
1799 JCExpression tree = access(make.at(pos).Ident(ot));
1800 TypeSymbol otc = ot.type.tsym;
1801 while (!(preciseMatch ? sym.isMemberOf(otc, types) : otc.isSubClass(sym.owner, types))) {
1802 do {
1803 ots = ots.tail;
1804 if (ots.isEmpty()) {
1805 log.error(pos,
1806 "no.encl.instance.of.type.in.scope",
1807 c);
1808 Assert.error();
1809 return tree;
1810 }
1811 ot = ots.head;
1812 } while (ot.owner != otc);
1813 tree = access(make.at(pos).Select(tree, ot));
1814 otc = ot.type.tsym;
1815 }
1816 return tree;
1817 }
1818
1819 /** Return tree simulating the assignment {@code this.name = name}, where
1820 * name is the name of a free variable.
1821 */
1822 JCStatement initField(int pos, Name name) {
1823 Scope.Entry e = proxies.lookup(name);
1824 Symbol rhs = e.sym;
1825 Assert.check(rhs.owner.kind == MTH);
1826 Symbol lhs = e.next().sym;
1827 Assert.check(rhs.owner.owner == lhs.owner);
1828 make.at(pos);
1829 return
1830 make.Exec(
1831 make.Assign(
1832 make.Select(make.This(lhs.owner.erasure(types)), lhs),
1833 make.Ident(rhs)).setType(lhs.erasure(types)));
1834 }
1835
1836 /** Return tree simulating the assignment {@code this.this$n = this$n}.
1837 */
1838 JCStatement initOuterThis(int pos) {
1839 VarSymbol rhs = outerThisStack.head;
1840 Assert.check(rhs.owner.kind == MTH);
1841 VarSymbol lhs = outerThisStack.tail.head;
1842 Assert.check(rhs.owner.owner == lhs.owner);
1843 make.at(pos);
1844 return
1845 make.Exec(
1846 make.Assign(
1847 make.Select(make.This(lhs.owner.erasure(types)), lhs),
1848 make.Ident(rhs)).setType(lhs.erasure(types)));
1849 }
1850
1851 /**************************************************************************
1852 * Code for .class
1853 *************************************************************************/
1854
1855 /** Return the symbol of a class to contain a cache of
1856 * compiler-generated statics such as class$ and the
1857 * $assertionsDisabled flag. We create an anonymous nested class
1858 * (unless one already exists) and return its symbol. However,
1859 * for backward compatibility in 1.4 and earlier we use the
1860 * top-level class itself.
1861 */
1862 private ClassSymbol outerCacheClass() {
1863 ClassSymbol clazz = outermostClassDef.sym;
1864 if ((clazz.flags() & INTERFACE) == 0 &&
1865 !target.useInnerCacheClass()) return clazz;
1866 Scope s = clazz.members();
1867 for (Scope.Entry e = s.elems; e != null; e = e.sibling)
1868 if (e.sym.kind == TYP &&
1869 e.sym.name == names.empty &&
1870 (e.sym.flags() & INTERFACE) == 0) return (ClassSymbol) e.sym;
1871 return makeEmptyClass(STATIC | SYNTHETIC, clazz).sym;
1872 }
1873
1874 /** Return symbol for "class$" method. If there is no method definition
1875 * for class$, construct one as follows:
1876 *
1877 * class class$(String x0) {
1878 * try {
1879 * return Class.forName(x0);
1880 * } catch (ClassNotFoundException x1) {
1881 * throw new NoClassDefFoundError(x1.getMessage());
1882 * }
1883 * }
1884 */
1885 private MethodSymbol classDollarSym(DiagnosticPosition pos) {
1886 ClassSymbol outerCacheClass = outerCacheClass();
1887 MethodSymbol classDollarSym =
1888 (MethodSymbol)lookupSynthetic(classDollar,
1889 outerCacheClass.members());
1890 if (classDollarSym == null) {
1891 classDollarSym = new MethodSymbol(
1892 STATIC | SYNTHETIC,
1893 classDollar,
1894 new MethodType(
1895 List.of(syms.stringType),
1896 types.erasure(syms.classType),
1897 List.<Type>nil(),
1898 syms.methodClass),
1899 outerCacheClass);
1900 enterSynthetic(pos, classDollarSym, outerCacheClass.members());
1901
1902 JCMethodDecl md = make.MethodDef(classDollarSym, null);
1903 try {
1904 md.body = classDollarSymBody(pos, md);
1905 } catch (CompletionFailure ex) {
1906 md.body = make.Block(0, List.<JCStatement>nil());
1907 chk.completionError(pos, ex);
1908 }
1909 JCClassDecl outerCacheClassDef = classDef(outerCacheClass);
1910 outerCacheClassDef.defs = outerCacheClassDef.defs.prepend(md);
1911 }
1912 return classDollarSym;
1913 }
1914
1915 /** Generate code for class$(String name). */
1916 JCBlock classDollarSymBody(DiagnosticPosition pos, JCMethodDecl md) {
1917 MethodSymbol classDollarSym = md.sym;
1918 ClassSymbol outerCacheClass = (ClassSymbol)classDollarSym.owner;
1919
1920 JCBlock returnResult;
1921
1922 // in 1.4.2 and above, we use
1923 // Class.forName(String name, boolean init, ClassLoader loader);
1924 // which requires we cache the current loader in cl$
1925 if (target.classLiteralsNoInit()) {
1926 // clsym = "private static ClassLoader cl$"
1927 VarSymbol clsym = new VarSymbol(STATIC|SYNTHETIC,
1928 names.fromString("cl" + target.syntheticNameChar()),
1929 syms.classLoaderType,
1930 outerCacheClass);
1931 enterSynthetic(pos, clsym, outerCacheClass.members());
1932
1933 // emit "private static ClassLoader cl$;"
1934 JCVariableDecl cldef = make.VarDef(clsym, null);
1935 JCClassDecl outerCacheClassDef = classDef(outerCacheClass);
1936 outerCacheClassDef.defs = outerCacheClassDef.defs.prepend(cldef);
1937
1938 // newcache := "new cache$1[0]"
1939 JCNewArray newcache = make.
1940 NewArray(make.Type(outerCacheClass.type),
1941 List.<JCExpression>of(make.Literal(INT, 0).setType(syms.intType)),
1942 null);
1943 newcache.type = new ArrayType(types.erasure(outerCacheClass.type),
1944 syms.arrayClass);
1945
1946 // forNameSym := java.lang.Class.forName(
1947 // String s,boolean init,ClassLoader loader)
1948 Symbol forNameSym = lookupMethod(make_pos, names.forName,
1949 types.erasure(syms.classType),
1950 List.of(syms.stringType,
1951 syms.booleanType,
1952 syms.classLoaderType));
1953 // clvalue := "(cl$ == null) ?
1954 // $newcache.getClass().getComponentType().getClassLoader() : cl$"
1955 JCExpression clvalue =
1956 make.Conditional(
1957 makeBinary(EQ, make.Ident(clsym), makeNull()),
1958 make.Assign(
1959 make.Ident(clsym),
1960 makeCall(
1961 makeCall(makeCall(newcache,
1962 names.getClass,
1963 List.<JCExpression>nil()),
1964 names.getComponentType,
1965 List.<JCExpression>nil()),
1966 names.getClassLoader,
1967 List.<JCExpression>nil())).setType(syms.classLoaderType),
1968 make.Ident(clsym)).setType(syms.classLoaderType);
1969
1970 // returnResult := "{ return Class.forName(param1, false, cl$); }"
1971 List<JCExpression> args = List.of(make.Ident(md.params.head.sym),
1972 makeLit(syms.booleanType, 0),
1973 clvalue);
1974 returnResult = make.
1975 Block(0, List.<JCStatement>of(make.
1976 Call(make. // return
1977 App(make.
1978 Ident(forNameSym), args))));
1979 } else {
1980 // forNameSym := java.lang.Class.forName(String s)
1981 Symbol forNameSym = lookupMethod(make_pos,
1982 names.forName,
1983 types.erasure(syms.classType),
1984 List.of(syms.stringType));
1985 // returnResult := "{ return Class.forName(param1); }"
1986 returnResult = make.
1987 Block(0, List.of(make.
1988 Call(make. // return
1989 App(make.
1990 QualIdent(forNameSym),
1991 List.<JCExpression>of(make.
1992 Ident(md.params.
1993 head.sym))))));
1994 }
1995
1996 // catchParam := ClassNotFoundException e1
1997 VarSymbol catchParam =
1998 new VarSymbol(0, make.paramName(1),
1999 syms.classNotFoundExceptionType,
2000 classDollarSym);
2001
2002 JCStatement rethrow;
2003 if (target.hasInitCause()) {
2004 // rethrow = "throw new NoClassDefFoundError().initCause(e);
2005 JCExpression throwExpr =
2006 makeCall(makeNewClass(syms.noClassDefFoundErrorType,
2007 List.<JCExpression>nil()),
2008 names.initCause,
2009 List.<JCExpression>of(make.Ident(catchParam)));
2010 rethrow = make.Throw(throwExpr);
2011 } else {
2012 // getMessageSym := ClassNotFoundException.getMessage()
2013 Symbol getMessageSym = lookupMethod(make_pos,
2014 names.getMessage,
2015 syms.classNotFoundExceptionType,
2016 List.<Type>nil());
2017 // rethrow = "throw new NoClassDefFoundError(e.getMessage());"
2018 rethrow = make.
2019 Throw(makeNewClass(syms.noClassDefFoundErrorType,
2020 List.<JCExpression>of(make.App(make.Select(make.Ident(catchParam),
2021 getMessageSym),
2022 List.<JCExpression>nil()))));
2023 }
2024
2025 // rethrowStmt := "( $rethrow )"
2026 JCBlock rethrowStmt = make.Block(0, List.of(rethrow));
2027
2028 // catchBlock := "catch ($catchParam) $rethrowStmt"
2029 JCCatch catchBlock = make.Catch(make.VarDef(catchParam, null),
2030 rethrowStmt);
2031
2032 // tryCatch := "try $returnResult $catchBlock"
2033 JCStatement tryCatch = make.Try(returnResult,
2034 List.of(catchBlock), null);
2035
2036 return make.Block(0, List.of(tryCatch));
2037 }
2038 // where
2039 /** Create an attributed tree of the form left.name(). */
2040 private JCMethodInvocation makeCall(JCExpression left, Name name, List<JCExpression> args) {
2041 Assert.checkNonNull(left.type);
2042 Symbol funcsym = lookupMethod(make_pos, name, left.type,
2043 TreeInfo.types(args));
2044 return make.App(make.Select(left, funcsym), args);
2045 }
2046
2047 /** The Name Of The variable to cache T.class values.
2048 * @param sig The signature of type T.
2049 */
2050 private Name cacheName(String sig) {
2051 StringBuilder buf = new StringBuilder();
2052 if (sig.startsWith("[")) {
2053 buf = buf.append("array");
2054 while (sig.startsWith("[")) {
2055 buf = buf.append(target.syntheticNameChar());
2056 sig = sig.substring(1);
2057 }
2058 if (sig.startsWith("L")) {
2059 sig = sig.substring(0, sig.length() - 1);
2060 }
2061 } else {
2062 buf = buf.append("class" + target.syntheticNameChar());
2063 }
2064 buf = buf.append(sig.replace('.', target.syntheticNameChar()));
2065 return names.fromString(buf.toString());
2066 }
2067
2068 /** The variable symbol that caches T.class values.
2069 * If none exists yet, create a definition.
2070 * @param sig The signature of type T.
2071 * @param pos The position to report diagnostics, if any.
2072 */
2073 private VarSymbol cacheSym(DiagnosticPosition pos, String sig) {
2074 ClassSymbol outerCacheClass = outerCacheClass();
2075 Name cname = cacheName(sig);
2076 VarSymbol cacheSym =
2077 (VarSymbol)lookupSynthetic(cname, outerCacheClass.members());
2078 if (cacheSym == null) {
2079 cacheSym = new VarSymbol(
2080 STATIC | SYNTHETIC, cname, types.erasure(syms.classType), outerCacheClass);
2081 enterSynthetic(pos, cacheSym, outerCacheClass.members());
2082
2083 JCVariableDecl cacheDef = make.VarDef(cacheSym, null);
2084 JCClassDecl outerCacheClassDef = classDef(outerCacheClass);
2085 outerCacheClassDef.defs = outerCacheClassDef.defs.prepend(cacheDef);
2086 }
2087 return cacheSym;
2088 }
2089
2090 /** The tree simulating a T.class expression.
2091 * @param clazz The tree identifying type T.
2092 */
2093 private JCExpression classOf(JCTree clazz) {
2094 return classOfType(clazz.type, clazz.pos());
2095 }
2096
2097 private JCExpression classOfType(Type type, DiagnosticPosition pos) {
2098 switch (type.getTag()) {
2099 case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
2100 case DOUBLE: case BOOLEAN: case VOID:
2101 // replace with <BoxedClass>.TYPE
2102 ClassSymbol c = types.boxedClass(type);
2103 Symbol typeSym =
2104 rs.accessBase(
2105 rs.findIdentInType(attrEnv, c.type, names.TYPE, VAR),
2106 pos, c.type, names.TYPE, true);
2107 if (typeSym.kind == VAR)
2108 ((VarSymbol)typeSym).getConstValue(); // ensure initializer is evaluated
2109 return make.QualIdent(typeSym);
2110 case CLASS: case ARRAY:
2111 if (target.hasClassLiterals()) {
2112 VarSymbol sym = new VarSymbol(
2113 STATIC | PUBLIC | FINAL, names._class,
2114 syms.classType, type.tsym);
2115 return make_at(pos).Select(make.Type(type), sym);
2116 }
2117 // replace with <cache == null ? cache = class$(tsig) : cache>
2118 // where
2119 // - <tsig> is the type signature of T,
2120 // - <cache> is the cache variable for tsig.
2121 String sig =
2122 writer.xClassName(type).toString().replace('/', '.');
2123 Symbol cs = cacheSym(pos, sig);
2124 return make_at(pos).Conditional(
2125 makeBinary(EQ, make.Ident(cs), makeNull()),
2126 make.Assign(
2127 make.Ident(cs),
2128 make.App(
2129 make.Ident(classDollarSym(pos)),
2130 List.<JCExpression>of(make.Literal(CLASS, sig)
2131 .setType(syms.stringType))))
2132 .setType(types.erasure(syms.classType)),
2133 make.Ident(cs)).setType(types.erasure(syms.classType));
2134 default:
2135 throw new AssertionError();
2136 }
2137 }
2138
2139 /**************************************************************************
2140 * Code for enabling/disabling assertions.
2141 *************************************************************************/
2142
2143 // This code is not particularly robust if the user has
2144 // previously declared a member named '$assertionsDisabled'.
2145 // The same faulty idiom also appears in the translation of
2146 // class literals above. We should report an error if a
2147 // previous declaration is not synthetic.
2148
2149 private JCExpression assertFlagTest(DiagnosticPosition pos) {
2150 // Outermost class may be either true class or an interface.
2151 ClassSymbol outermostClass = outermostClassDef.sym;
2152
2153 // note that this is a class, as an interface can't contain a statement.
2154 ClassSymbol container = currentClass;
2155
2156 VarSymbol assertDisabledSym =
2157 (VarSymbol)lookupSynthetic(dollarAssertionsDisabled,
2158 container.members());
2159 if (assertDisabledSym == null) {
2160 assertDisabledSym =
2161 new VarSymbol(STATIC | FINAL | SYNTHETIC,
2162 dollarAssertionsDisabled,
2163 syms.booleanType,
2164 container);
2165 enterSynthetic(pos, assertDisabledSym, container.members());
2166 Symbol desiredAssertionStatusSym = lookupMethod(pos,
2167 names.desiredAssertionStatus,
2168 types.erasure(syms.classType),
2169 List.<Type>nil());
2170 JCClassDecl containerDef = classDef(container);
2171 make_at(containerDef.pos());
2172 JCExpression notStatus = makeUnary(NOT, make.App(make.Select(
2173 classOfType(types.erasure(outermostClass.type),
2174 containerDef.pos()),
2175 desiredAssertionStatusSym)));
2176 JCVariableDecl assertDisabledDef = make.VarDef(assertDisabledSym,
2177 notStatus);
2178 containerDef.defs = containerDef.defs.prepend(assertDisabledDef);
2179 }
2180 make_at(pos);
2181 return makeUnary(NOT, make.Ident(assertDisabledSym));
2182 }
2183
2184
2185 /**************************************************************************
2186 * Building blocks for let expressions
2187 *************************************************************************/
2188
2189 interface TreeBuilder {
2190 JCTree build(JCTree arg);
2191 }
2192
2193 /** Construct an expression using the builder, with the given rval
2194 * expression as an argument to the builder. However, the rval
2195 * expression must be computed only once, even if used multiple
2196 * times in the result of the builder. We do that by
2197 * constructing a "let" expression that saves the rvalue into a
2198 * temporary variable and then uses the temporary variable in
2199 * place of the expression built by the builder. The complete
2200 * resulting expression is of the form
2201 * <pre>
2202 * (let <b>TYPE</b> <b>TEMP</b> = <b>RVAL</b>;
2203 * in (<b>BUILDER</b>(<b>TEMP</b>)))
2204 * </pre>
2205 * where <code><b>TEMP</b></code> is a newly declared variable
2206 * in the let expression.
2207 */
2208 JCTree abstractRval(JCTree rval, Type type, TreeBuilder builder) {
2209 rval = TreeInfo.skipParens(rval);
2210 switch (rval.getTag()) {
2211 case LITERAL:
2212 return builder.build(rval);
2213 case IDENT:
2214 JCIdent id = (JCIdent) rval;
2215 if ((id.sym.flags() & FINAL) != 0 && id.sym.owner.kind == MTH)
2216 return builder.build(rval);
2217 }
2218 VarSymbol var =
2219 new VarSymbol(FINAL|SYNTHETIC,
2220 names.fromString(
2221 target.syntheticNameChar()
2222 + "" + rval.hashCode()),
2223 type,
2224 currentMethodSym);
2225 rval = convert(rval,type);
2226 JCVariableDecl def = make.VarDef(var, (JCExpression)rval); // XXX cast
2227 JCTree built = builder.build(make.Ident(var));
2228 JCTree res = make.LetExpr(def, built);
2229 res.type = built.type;
2230 return res;
2231 }
2232
2233 // same as above, with the type of the temporary variable computed
2234 JCTree abstractRval(JCTree rval, TreeBuilder builder) {
2235 return abstractRval(rval, rval.type, builder);
2236 }
2237
2238 // same as above, but for an expression that may be used as either
2239 // an rvalue or an lvalue. This requires special handling for
2240 // Select expressions, where we place the left-hand-side of the
2241 // select in a temporary, and for Indexed expressions, where we
2242 // place both the indexed expression and the index value in temps.
2243 JCTree abstractLval(JCTree lval, final TreeBuilder builder) {
2244 lval = TreeInfo.skipParens(lval);
2245 switch (lval.getTag()) {
2246 case IDENT:
2247 return builder.build(lval);
2248 case SELECT: {
2249 final JCFieldAccess s = (JCFieldAccess)lval;
2250 JCTree selected = TreeInfo.skipParens(s.selected);
2251 Symbol lid = TreeInfo.symbol(s.selected);
2252 if (lid != null && lid.kind == TYP) return builder.build(lval);
2253 return abstractRval(s.selected, new TreeBuilder() {
2254 public JCTree build(final JCTree selected) {
2255 return builder.build(make.Select((JCExpression)selected, s.sym));
2256 }
2257 });
2258 }
2259 case INDEXED: {
2260 final JCArrayAccess i = (JCArrayAccess)lval;
2261 return abstractRval(i.indexed, new TreeBuilder() {
2262 public JCTree build(final JCTree indexed) {
2263 return abstractRval(i.index, syms.intType, new TreeBuilder() {
2264 public JCTree build(final JCTree index) {
2265 JCTree newLval = make.Indexed((JCExpression)indexed,
2266 (JCExpression)index);
2267 newLval.setType(i.type);
2268 return builder.build(newLval);
2269 }
2270 });
2271 }
2272 });
2273 }
2274 case TYPECAST: {
2275 return abstractLval(((JCTypeCast)lval).expr, builder);
2276 }
2277 }
2278 throw new AssertionError(lval);
2279 }
2280
2281 // evaluate and discard the first expression, then evaluate the second.
2282 JCTree makeComma(final JCTree expr1, final JCTree expr2) {
2283 return abstractRval(expr1, new TreeBuilder() {
2284 public JCTree build(final JCTree discarded) {
2285 return expr2;
2286 }
2287 });
2288 }
2289
2290 /**************************************************************************
2291 * Translation methods
2292 *************************************************************************/
2293
2294 /** Visitor argument: enclosing operator node.
2295 */
2296 private JCExpression enclOp;
2297
2298 /** Visitor method: Translate a single node.
2299 * Attach the source position from the old tree to its replacement tree.
2300 */
2301 public <T extends JCTree> T translate(T tree) {
2302 if (tree == null) {
2303 return null;
2304 } else {
2305 make_at(tree.pos());
2306 T result = super.translate(tree);
2307 if (endPosTable != null && result != tree) {
2308 endPosTable.replaceTree(tree, result);
2309 }
2310 return result;
2311 }
2312 }
2313
2314 /** Visitor method: Translate a single node, boxing or unboxing if needed.
2315 */
2316 public <T extends JCTree> T translate(T tree, Type type) {
2317 return (tree == null) ? null : boxIfNeeded(translate(tree), type);
2318 }
2319
2320 /** Visitor method: Translate tree.
2321 */
2322 public <T extends JCTree> T translate(T tree, JCExpression enclOp) {
2323 JCExpression prevEnclOp = this.enclOp;
2324 this.enclOp = enclOp;
2325 T res = translate(tree);
2326 this.enclOp = prevEnclOp;
2327 return res;
2328 }
2329
2330 /** Visitor method: Translate list of trees.
2331 */
2332 public <T extends JCTree> List<T> translate(List<T> trees, JCExpression enclOp) {
2333 JCExpression prevEnclOp = this.enclOp;
2334 this.enclOp = enclOp;
2335 List<T> res = translate(trees);
2336 this.enclOp = prevEnclOp;
2337 return res;
2338 }
2339
2340 /** Visitor method: Translate list of trees.
2341 */
2342 public <T extends JCTree> List<T> translate(List<T> trees, Type type) {
2343 if (trees == null) return null;
2344 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
2345 l.head = translate(l.head, type);
2346 return trees;
2347 }
2348
2349 public void visitTopLevel(JCCompilationUnit tree) {
2350 if (needPackageInfoClass(tree)) {
2351 Name name = names.package_info;
2352 long flags = Flags.ABSTRACT | Flags.INTERFACE;
2353 if (target.isPackageInfoSynthetic())
2354 // package-info is marked SYNTHETIC in JDK 1.6 and later releases
2355 flags = flags | Flags.SYNTHETIC;
2356 JCClassDecl packageAnnotationsClass
2357 = make.ClassDef(make.Modifiers(flags,
2358 tree.packageAnnotations),
2359 name, List.<JCTypeParameter>nil(),
2360 null, List.<JCExpression>nil(), List.<JCTree>nil());
2361 ClassSymbol c = tree.packge.package_info;
2362 c.flags_field |= flags;
2363 c.annotations.setAttributes(tree.packge.annotations);
2364 ClassType ctype = (ClassType) c.type;
2365 ctype.supertype_field = syms.objectType;
2366 ctype.interfaces_field = List.nil();
2367 packageAnnotationsClass.sym = c;
2368
2369 translated.append(packageAnnotationsClass);
2370 }
2371 }
2372 // where
2373 private boolean needPackageInfoClass(JCCompilationUnit tree) {
2374 switch (pkginfoOpt) {
2375 case ALWAYS:
2376 return true;
2377 case LEGACY:
2378 return tree.packageAnnotations.nonEmpty();
2379 case NONEMPTY:
2380 for (Attribute.Compound a :
2381 tree.packge.annotations.getDeclarationAttributes()) {
2382 Attribute.RetentionPolicy p = types.getRetention(a);
2383 if (p != Attribute.RetentionPolicy.SOURCE)
2384 return true;
2385 }
2386 return false;
2387 }
2388 throw new AssertionError();
2389 }
2390
2391 public void visitClassDef(JCClassDecl tree) {
2392 ClassSymbol currentClassPrev = currentClass;
2393 MethodSymbol currentMethodSymPrev = currentMethodSym;
2394 currentClass = tree.sym;
2395 currentMethodSym = null;
2396 classdefs.put(currentClass, tree);
2397
2398 proxies = proxies.dup(currentClass);
2399 List<VarSymbol> prevOuterThisStack = outerThisStack;
2400
2401 // If this is an enum definition
2402 if ((tree.mods.flags & ENUM) != 0 &&
2403 (types.supertype(currentClass.type).tsym.flags() & ENUM) == 0)
2404 visitEnumDef(tree);
2405
2406 // If this is a nested class, define a this$n field for
2407 // it and add to proxies.
2408 JCVariableDecl otdef = null;
2409 if (currentClass.hasOuterInstance())
2410 otdef = outerThisDef(tree.pos, currentClass);
2411
2412 // If this is a local class, define proxies for all its free variables.
2413 List<JCVariableDecl> fvdefs = freevarDefs(
2414 tree.pos, freevars(currentClass), currentClass);
2415
2416 // Recursively translate superclass, interfaces.
2417 tree.extending = translate(tree.extending);
2418 tree.implementing = translate(tree.implementing);
2419
2420 if (currentClass.isLocal()) {
2421 ClassSymbol encl = currentClass.owner.enclClass();
2422 if (encl.trans_local == null) {
2423 encl.trans_local = List.nil();
2424 }
2425 encl.trans_local = encl.trans_local.prepend(currentClass);
2426 }
2427
2428 // Recursively translate members, taking into account that new members
2429 // might be created during the translation and prepended to the member
2430 // list `tree.defs'.
2431 List<JCTree> seen = List.nil();
2432 while (tree.defs != seen) {
2433 List<JCTree> unseen = tree.defs;
2434 for (List<JCTree> l = unseen; l.nonEmpty() && l != seen; l = l.tail) {
2435 JCTree outermostMemberDefPrev = outermostMemberDef;
2436 if (outermostMemberDefPrev == null) outermostMemberDef = l.head;
2437 l.head = translate(l.head);
2438 outermostMemberDef = outermostMemberDefPrev;
2439 }
2440 seen = unseen;
2441 }
2442
2443 // Convert a protected modifier to public, mask static modifier.
2444 if ((tree.mods.flags & PROTECTED) != 0) tree.mods.flags |= PUBLIC;
2445 tree.mods.flags &= ClassFlags;
2446
2447 // Convert name to flat representation, replacing '.' by '$'.
2448 tree.name = Convert.shortName(currentClass.flatName());
2449
2450 // Add this$n and free variables proxy definitions to class.
2451 for (List<JCVariableDecl> l = fvdefs; l.nonEmpty(); l = l.tail) {
2452 tree.defs = tree.defs.prepend(l.head);
2453 enterSynthetic(tree.pos(), l.head.sym, currentClass.members());
2454 }
2455 if (currentClass.hasOuterInstance()) {
2456 tree.defs = tree.defs.prepend(otdef);
2457 enterSynthetic(tree.pos(), otdef.sym, currentClass.members());
2458 }
2459
2460 proxies = proxies.leave();
2461 outerThisStack = prevOuterThisStack;
2462
2463 // Append translated tree to `translated' queue.
2464 translated.append(tree);
2465
2466 currentClass = currentClassPrev;
2467 currentMethodSym = currentMethodSymPrev;
2468
2469 // Return empty block {} as a placeholder for an inner class.
2470 result = make_at(tree.pos()).Block(0, List.<JCStatement>nil());
2471 }
2472
2473 /** Translate an enum class. */
2474 private void visitEnumDef(JCClassDecl tree) {
2475 make_at(tree.pos());
2476
2477 // add the supertype, if needed
2478 if (tree.extending == null)
2479 tree.extending = make.Type(types.supertype(tree.type));
2480
2481 // classOfType adds a cache field to tree.defs unless
2482 // target.hasClassLiterals().
2483 JCExpression e_class = classOfType(tree.sym.type, tree.pos()).
2484 setType(types.erasure(syms.classType));
2485
2486 // process each enumeration constant, adding implicit constructor parameters
2487 int nextOrdinal = 0;
2488 ListBuffer<JCExpression> values = new ListBuffer<JCExpression>();
2489 ListBuffer<JCTree> enumDefs = new ListBuffer<JCTree>();
2490 ListBuffer<JCTree> otherDefs = new ListBuffer<JCTree>();
2491 for (List<JCTree> defs = tree.defs;
2492 defs.nonEmpty();
2493 defs=defs.tail) {
2494 if (defs.head.hasTag(VARDEF) && (((JCVariableDecl) defs.head).mods.flags & ENUM) != 0) {
2495 JCVariableDecl var = (JCVariableDecl)defs.head;
2496 visitEnumConstantDef(var, nextOrdinal++);
2497 values.append(make.QualIdent(var.sym));
2498 enumDefs.append(var);
2499 } else {
2500 otherDefs.append(defs.head);
2501 }
2502 }
2503
2504 // private static final T[] #VALUES = { a, b, c };
2505 Name valuesName = names.fromString(target.syntheticNameChar() + "VALUES");
2506 while (tree.sym.members().lookup(valuesName).scope != null) // avoid name clash
2507 valuesName = names.fromString(valuesName + "" + target.syntheticNameChar());
2508 Type arrayType = new ArrayType(types.erasure(tree.type), syms.arrayClass);
2509 VarSymbol valuesVar = new VarSymbol(PRIVATE|FINAL|STATIC|SYNTHETIC,
2510 valuesName,
2511 arrayType,
2512 tree.type.tsym);
2513 JCNewArray newArray = make.NewArray(make.Type(types.erasure(tree.type)),
2514 List.<JCExpression>nil(),
2515 values.toList());
2516 newArray.type = arrayType;
2517 enumDefs.append(make.VarDef(valuesVar, newArray));
2518 tree.sym.members().enter(valuesVar);
2519
2520 Symbol valuesSym = lookupMethod(tree.pos(), names.values,
2521 tree.type, List.<Type>nil());
2522 List<JCStatement> valuesBody;
2523 if (useClone()) {
2524 // return (T[]) $VALUES.clone();
2525 JCTypeCast valuesResult =
2526 make.TypeCast(valuesSym.type.getReturnType(),
2527 make.App(make.Select(make.Ident(valuesVar),
2528 syms.arrayCloneMethod)));
2529 valuesBody = List.<JCStatement>of(make.Return(valuesResult));
2530 } else {
2531 // template: T[] $result = new T[$values.length];
2532 Name resultName = names.fromString(target.syntheticNameChar() + "result");
2533 while (tree.sym.members().lookup(resultName).scope != null) // avoid name clash
2534 resultName = names.fromString(resultName + "" + target.syntheticNameChar());
2535 VarSymbol resultVar = new VarSymbol(FINAL|SYNTHETIC,
2536 resultName,
2537 arrayType,
2538 valuesSym);
2539 JCNewArray resultArray = make.NewArray(make.Type(types.erasure(tree.type)),
2540 List.of(make.Select(make.Ident(valuesVar), syms.lengthVar)),
2541 null);
2542 resultArray.type = arrayType;
2543 JCVariableDecl decl = make.VarDef(resultVar, resultArray);
2544
2545 // template: System.arraycopy($VALUES, 0, $result, 0, $VALUES.length);
2546 if (systemArraycopyMethod == null) {
2547 systemArraycopyMethod =
2548 new MethodSymbol(PUBLIC | STATIC,
2549 names.fromString("arraycopy"),
2550 new MethodType(List.<Type>of(syms.objectType,
2551 syms.intType,
2552 syms.objectType,
2553 syms.intType,
2554 syms.intType),
2555 syms.voidType,
2556 List.<Type>nil(),
2557 syms.methodClass),
2558 syms.systemType.tsym);
2559 }
2560 JCStatement copy =
2561 make.Exec(make.App(make.Select(make.Ident(syms.systemType.tsym),
2562 systemArraycopyMethod),
2563 List.of(make.Ident(valuesVar), make.Literal(0),
2564 make.Ident(resultVar), make.Literal(0),
2565 make.Select(make.Ident(valuesVar), syms.lengthVar))));
2566
2567 // template: return $result;
2568 JCStatement ret = make.Return(make.Ident(resultVar));
2569 valuesBody = List.<JCStatement>of(decl, copy, ret);
2570 }
2571
2572 JCMethodDecl valuesDef =
2573 make.MethodDef((MethodSymbol)valuesSym, make.Block(0, valuesBody));
2574
2575 enumDefs.append(valuesDef);
2576
2577 if (debugLower)
2578 System.err.println(tree.sym + ".valuesDef = " + valuesDef);
2579
2580 /** The template for the following code is:
2581 *
2582 * public static E valueOf(String name) {
2583 * return (E)Enum.valueOf(E.class, name);
2584 * }
2585 *
2586 * where E is tree.sym
2587 */
2588 MethodSymbol valueOfSym = lookupMethod(tree.pos(),
2589 names.valueOf,
2590 tree.sym.type,
2591 List.of(syms.stringType));
2592 Assert.check((valueOfSym.flags() & STATIC) != 0);
2593 VarSymbol nameArgSym = valueOfSym.params.head;
2594 JCIdent nameVal = make.Ident(nameArgSym);
2595 JCStatement enum_ValueOf =
2596 make.Return(make.TypeCast(tree.sym.type,
2597 makeCall(make.Ident(syms.enumSym),
2598 names.valueOf,
2599 List.of(e_class, nameVal))));
2600 JCMethodDecl valueOf = make.MethodDef(valueOfSym,
2601 make.Block(0, List.of(enum_ValueOf)));
2602 nameVal.sym = valueOf.params.head.sym;
2603 if (debugLower)
2604 System.err.println(tree.sym + ".valueOf = " + valueOf);
2605 enumDefs.append(valueOf);
2606
2607 enumDefs.appendList(otherDefs.toList());
2608 tree.defs = enumDefs.toList();
2609 }
2610 // where
2611 private MethodSymbol systemArraycopyMethod;
2612 private boolean useClone() {
2613 try {
2614 Scope.Entry e = syms.objectType.tsym.members().lookup(names.clone);
2615 return (e.sym != null);
2616 }
2617 catch (CompletionFailure e) {
2618 return false;
2619 }
2620 }
2621
2622 /** Translate an enumeration constant and its initializer. */
2623 private void visitEnumConstantDef(JCVariableDecl var, int ordinal) {
2624 JCNewClass varDef = (JCNewClass)var.init;
2625 varDef.args = varDef.args.
2626 prepend(makeLit(syms.intType, ordinal)).
2627 prepend(makeLit(syms.stringType, var.name.toString()));
2628 }
2629
2630 public void visitMethodDef(JCMethodDecl tree) {
2631 if (tree.name == names.init && (currentClass.flags_field&ENUM) != 0) {
2632 // Add "String $enum$name, int $enum$ordinal" to the beginning of the
2633 // argument list for each constructor of an enum.
2634 JCVariableDecl nameParam = make_at(tree.pos()).
2635 Param(names.fromString(target.syntheticNameChar() +
2636 "enum" + target.syntheticNameChar() + "name"),
2637 syms.stringType, tree.sym);
2638 nameParam.mods.flags |= SYNTHETIC; nameParam.sym.flags_field |= SYNTHETIC;
2639 JCVariableDecl ordParam = make.
2640 Param(names.fromString(target.syntheticNameChar() +
2641 "enum" + target.syntheticNameChar() +
2642 "ordinal"),
2643 syms.intType, tree.sym);
2644 ordParam.mods.flags |= SYNTHETIC; ordParam.sym.flags_field |= SYNTHETIC;
2645
2646 tree.params = tree.params.prepend(ordParam).prepend(nameParam);
2647
2648 MethodSymbol m = tree.sym;
2649 m.extraParams = m.extraParams.prepend(ordParam.sym);
2650 m.extraParams = m.extraParams.prepend(nameParam.sym);
2651 Type olderasure = m.erasure(types);
2652 m.erasure_field = new MethodType(
2653 olderasure.getParameterTypes().prepend(syms.intType).prepend(syms.stringType),
2654 olderasure.getReturnType(),
2655 olderasure.getThrownTypes(),
2656 syms.methodClass);
2657 }
2658
2659 JCMethodDecl prevMethodDef = currentMethodDef;
2660 MethodSymbol prevMethodSym = currentMethodSym;
2661 try {
2662 currentMethodDef = tree;
2663 currentMethodSym = tree.sym;
2664 visitMethodDefInternal(tree);
2665 } finally {
2666 currentMethodDef = prevMethodDef;
2667 currentMethodSym = prevMethodSym;
2668 }
2669 }
2670 //where
2671 private void visitMethodDefInternal(JCMethodDecl tree) {
2672 if (tree.name == names.init &&
2673 (currentClass.isInner() ||
2674 (currentClass.owner.kind & (VAR | MTH)) != 0)) {
2675 // We are seeing a constructor of an inner class.
2676 MethodSymbol m = tree.sym;
2677
2678 // Push a new proxy scope for constructor parameters.
2679 // and create definitions for any this$n and proxy parameters.
2680 proxies = proxies.dup(m);
2681 List<VarSymbol> prevOuterThisStack = outerThisStack;
2682 List<VarSymbol> fvs = freevars(currentClass);
2683 JCVariableDecl otdef = null;
2684 if (currentClass.hasOuterInstance())
2685 otdef = outerThisDef(tree.pos, m);
2686 List<JCVariableDecl> fvdefs = freevarDefs(tree.pos, fvs, m);
2687
2688 // Recursively translate result type, parameters and thrown list.
2689 tree.restype = translate(tree.restype);
2690 tree.params = translateVarDefs(tree.params);
2691 tree.thrown = translate(tree.thrown);
2692
2693 // when compiling stubs, don't process body
2694 if (tree.body == null) {
2695 result = tree;
2696 return;
2697 }
2698
2699 // Add this$n (if needed) in front of and free variables behind
2700 // constructor parameter list.
2701 tree.params = tree.params.appendList(fvdefs);
2702 if (currentClass.hasOuterInstance())
2703 tree.params = tree.params.prepend(otdef);
2704
2705 // If this is an initial constructor, i.e., it does not start with
2706 // this(...), insert initializers for this$n and proxies
2707 // before (pre-1.4, after) the call to superclass constructor.
2708 JCStatement selfCall = translate(tree.body.stats.head);
2709
2710 List<JCStatement> added = List.nil();
2711 if (fvs.nonEmpty()) {
2712 List<Type> addedargtypes = List.nil();
2713 for (List<VarSymbol> l = fvs; l.nonEmpty(); l = l.tail) {
2714 if (TreeInfo.isInitialConstructor(tree))
2715 added = added.prepend(
2716 initField(tree.body.pos, proxyName(l.head.name)));
2717 addedargtypes = addedargtypes.prepend(l.head.erasure(types));
2718 }
2719 Type olderasure = m.erasure(types);
2720 m.erasure_field = new MethodType(
2721 olderasure.getParameterTypes().appendList(addedargtypes),
2722 olderasure.getReturnType(),
2723 olderasure.getThrownTypes(),
2724 syms.methodClass);
2725 }
2726 if (currentClass.hasOuterInstance() &&
2727 TreeInfo.isInitialConstructor(tree))
2728 {
2729 added = added.prepend(initOuterThis(tree.body.pos));
2730 }
2731
2732 // pop local variables from proxy stack
2733 proxies = proxies.leave();
2734
2735 // recursively translate following local statements and
2736 // combine with this- or super-call
2737 List<JCStatement> stats = translate(tree.body.stats.tail);
2738 if (target.initializeFieldsBeforeSuper())
2739 tree.body.stats = stats.prepend(selfCall).prependList(added);
2740 else
2741 tree.body.stats = stats.prependList(added).prepend(selfCall);
2742
2743 outerThisStack = prevOuterThisStack;
2744 } else {
2745 Map<Symbol, Symbol> prevLambdaTranslationMap =
2746 lambdaTranslationMap;
2747 try {
2748 lambdaTranslationMap = (tree.sym.flags() & SYNTHETIC) != 0 &&
2749 tree.sym.name.startsWith(names.lambda) ?
2750 makeTranslationMap(tree) : null;
2751 super.visitMethodDef(tree);
2752 } finally {
2753 lambdaTranslationMap = prevLambdaTranslationMap;
2754 }
2755 }
2756 result = tree;
2757 }
2758 //where
2759 private Map<Symbol, Symbol> makeTranslationMap(JCMethodDecl tree) {
2760 Map<Symbol, Symbol> translationMap = new HashMap<Symbol,Symbol>();
2761 for (JCVariableDecl vd : tree.params) {
2762 Symbol p = vd.sym;
2763 if (p != p.baseSymbol()) {
2764 translationMap.put(p.baseSymbol(), p);
2765 }
2766 }
2767 return translationMap;
2768 }
2769
2770 public void visitAnnotatedType(JCAnnotatedType tree) {
2771 // No need to retain type annotations in the tree
2772 // tree.annotations = translate(tree.annotations);
2773 tree.annotations = List.nil();
2774 tree.underlyingType = translate(tree.underlyingType);
2775 // but maintain type annotations in the type.
2776 if (tree.type.isAnnotated()) {
2777 if (tree.underlyingType.type.isAnnotated()) {
2778 // The erasure of a type variable might be annotated.
2779 // Merge all annotations.
2780 AnnotatedType newat = (AnnotatedType) tree.underlyingType.type;
2781 AnnotatedType at = (AnnotatedType) tree.type;
2782 at.underlyingType = newat.underlyingType;
2783 newat.typeAnnotations = at.typeAnnotations.appendList(newat.typeAnnotations);
2784 tree.type = newat;
2785 } else {
2786 // Create a new AnnotatedType to have the correct tag.
2787 AnnotatedType oldat = (AnnotatedType) tree.type;
2788 tree.type = new AnnotatedType(tree.underlyingType.type);
2789 ((AnnotatedType) tree.type).typeAnnotations = oldat.typeAnnotations;
2790 }
2791 }
2792 result = tree;
2793 }
2794
2795 public void visitTypeCast(JCTypeCast tree) {
2796 tree.clazz = translate(tree.clazz);
2797 if (tree.type.isPrimitive() != tree.expr.type.isPrimitive())
2798 tree.expr = translate(tree.expr, tree.type);
2799 else
2800 tree.expr = translate(tree.expr);
2801 result = tree;
2802 }
2803
2804 public void visitNewClass(JCNewClass tree) {
2805 ClassSymbol c = (ClassSymbol)tree.constructor.owner;
2806
2807 // Box arguments, if necessary
2808 boolean isEnum = (tree.constructor.owner.flags() & ENUM) != 0;
2809 List<Type> argTypes = tree.constructor.type.getParameterTypes();
2810 if (isEnum) argTypes = argTypes.prepend(syms.intType).prepend(syms.stringType);
2811 tree.args = boxArgs(argTypes, tree.args, tree.varargsElement);
2812 tree.varargsElement = null;
2813
2814 // If created class is local, add free variables after
2815 // explicit constructor arguments.
2816 if ((c.owner.kind & (VAR | MTH)) != 0) {
2817 tree.args = tree.args.appendList(loadFreevars(tree.pos(), freevars(c)));
2818 }
2819
2820 // If an access constructor is used, append null as a last argument.
2821 Symbol constructor = accessConstructor(tree.pos(), tree.constructor);
2822 if (constructor != tree.constructor) {
2823 tree.args = tree.args.append(makeNull());
2824 tree.constructor = constructor;
2825 }
2826
2827 // If created class has an outer instance, and new is qualified, pass
2828 // qualifier as first argument. If new is not qualified, pass the
2829 // correct outer instance as first argument.
2830 if (c.hasOuterInstance()) {
2831 JCExpression thisArg;
2832 if (tree.encl != null) {
2833 thisArg = attr.makeNullCheck(translate(tree.encl));
2834 thisArg.type = tree.encl.type;
2835 } else if ((c.owner.kind & (MTH | VAR)) != 0) {
2836 // local class
2837 thisArg = makeThis(tree.pos(), c.type.getEnclosingType().tsym);
2838 } else {
2839 // nested class
2840 thisArg = makeOwnerThis(tree.pos(), c, false);
2841 }
2842 tree.args = tree.args.prepend(thisArg);
2843 }
2844 tree.encl = null;
2845
2846 // If we have an anonymous class, create its flat version, rather
2847 // than the class or interface following new.
2848 if (tree.def != null) {
2849 translate(tree.def);
2850 tree.clazz = access(make_at(tree.clazz.pos()).Ident(tree.def.sym));
2851 tree.def = null;
2852 } else {
2853 tree.clazz = access(c, tree.clazz, enclOp, false);
2854 }
2855 result = tree;
2856 }
2857
2858 // Simplify conditionals with known constant controlling expressions.
2859 // This allows us to avoid generating supporting declarations for
2860 // the dead code, which will not be eliminated during code generation.
2861 // Note that Flow.isFalse and Flow.isTrue only return true
2862 // for constant expressions in the sense of JLS 15.27, which
2863 // are guaranteed to have no side-effects. More aggressive
2864 // constant propagation would require that we take care to
2865 // preserve possible side-effects in the condition expression.
2866
2867 /** Visitor method for conditional expressions.
2868 */
2869 @Override
2870 public void visitConditional(JCConditional tree) {
2871 JCTree cond = tree.cond = translate(tree.cond, syms.booleanType);
2872 if (cond.type.isTrue()) {
2873 result = convert(translate(tree.truepart, tree.type), tree.type);
2874 addPrunedInfo(cond);
2875 } else if (cond.type.isFalse()) {
2876 result = convert(translate(tree.falsepart, tree.type), tree.type);
2877 addPrunedInfo(cond);
2878 } else {
2879 // Condition is not a compile-time constant.
2880 tree.truepart = translate(tree.truepart, tree.type);
2881 tree.falsepart = translate(tree.falsepart, tree.type);
2882 result = tree;
2883 }
2884 }
2885 //where
2886 private JCTree convert(JCTree tree, Type pt) {
2887 if (tree.type == pt || tree.type.hasTag(BOT))
2888 return tree;
2889 JCTree result = make_at(tree.pos()).TypeCast(make.Type(pt), (JCExpression)tree);
2890 result.type = (tree.type.constValue() != null) ? cfolder.coerce(tree.type, pt)
2891 : pt;
2892 return result;
2893 }
2894
2895 /** Visitor method for if statements.
2896 */
2897 public void visitIf(JCIf tree) {
2898 JCTree cond = tree.cond = translate(tree.cond, syms.booleanType);
2899 if (cond.type.isTrue()) {
2900 result = translate(tree.thenpart);
2901 addPrunedInfo(cond);
2902 } else if (cond.type.isFalse()) {
2903 if (tree.elsepart != null) {
2904 result = translate(tree.elsepart);
2905 } else {
2906 result = make.Skip();
2907 }
2908 addPrunedInfo(cond);
2909 } else {
2910 // Condition is not a compile-time constant.
2911 tree.thenpart = translate(tree.thenpart);
2912 tree.elsepart = translate(tree.elsepart);
2913 result = tree;
2914 }
2915 }
2916
2917 /** Visitor method for assert statements. Translate them away.
2918 */
2919 public void visitAssert(JCAssert tree) {
2920 DiagnosticPosition detailPos = (tree.detail == null) ? tree.pos() : tree.detail.pos();
2921 tree.cond = translate(tree.cond, syms.booleanType);
2922 if (!tree.cond.type.isTrue()) {
2923 JCExpression cond = assertFlagTest(tree.pos());
2924 List<JCExpression> exnArgs = (tree.detail == null) ?
2925 List.<JCExpression>nil() : List.of(translate(tree.detail));
2926 if (!tree.cond.type.isFalse()) {
2927 cond = makeBinary
2928 (AND,
2929 cond,
2930 makeUnary(NOT, tree.cond));
2931 }
2932 result =
2933 make.If(cond,
2934 make_at(tree).
2935 Throw(makeNewClass(syms.assertionErrorType, exnArgs)),
2936 null);
2937 } else {
2938 result = make.Skip();
2939 }
2940 }
2941
2942 public void visitApply(JCMethodInvocation tree) {
2943 Symbol meth = TreeInfo.symbol(tree.meth);
2944 List<Type> argtypes = meth.type.getParameterTypes();
2945 if (allowEnums &&
2946 meth.name==names.init &&
2947 meth.owner == syms.enumSym)
2948 argtypes = argtypes.tail.tail;
2949 tree.args = boxArgs(argtypes, tree.args, tree.varargsElement);
2950 tree.varargsElement = null;
2951 Name methName = TreeInfo.name(tree.meth);
2952 if (meth.name==names.init) {
2953 // We are seeing a this(...) or super(...) constructor call.
2954 // If an access constructor is used, append null as a last argument.
2955 Symbol constructor = accessConstructor(tree.pos(), meth);
2956 if (constructor != meth) {
2957 tree.args = tree.args.append(makeNull());
2958 TreeInfo.setSymbol(tree.meth, constructor);
2959 }
2960
2961 // If we are calling a constructor of a local class, add
2962 // free variables after explicit constructor arguments.
2963 ClassSymbol c = (ClassSymbol)constructor.owner;
2964 if ((c.owner.kind & (VAR | MTH)) != 0) {
2965 tree.args = tree.args.appendList(loadFreevars(tree.pos(), freevars(c)));
2966 }
2967
2968 // If we are calling a constructor of an enum class, pass
2969 // along the name and ordinal arguments
2970 if ((c.flags_field&ENUM) != 0 || c.getQualifiedName() == names.java_lang_Enum) {
2971 List<JCVariableDecl> params = currentMethodDef.params;
2972 if (currentMethodSym.owner.hasOuterInstance())
2973 params = params.tail; // drop this$n
2974 tree.args = tree.args
2975 .prepend(make_at(tree.pos()).Ident(params.tail.head.sym)) // ordinal
2976 .prepend(make.Ident(params.head.sym)); // name
2977 }
2978
2979 // If we are calling a constructor of a class with an outer
2980 // instance, and the call
2981 // is qualified, pass qualifier as first argument in front of
2982 // the explicit constructor arguments. If the call
2983 // is not qualified, pass the correct outer instance as
2984 // first argument.
2985 if (c.hasOuterInstance()) {
2986 JCExpression thisArg;
2987 if (tree.meth.hasTag(SELECT)) {
2988 thisArg = attr.
2989 makeNullCheck(translate(((JCFieldAccess) tree.meth).selected));
2990 tree.meth = make.Ident(constructor);
2991 ((JCIdent) tree.meth).name = methName;
2992 } else if ((c.owner.kind & (MTH | VAR)) != 0 || methName == names._this){
2993 // local class or this() call
2994 thisArg = makeThis(tree.meth.pos(), c.type.getEnclosingType().tsym);
2995 } else {
2996 // super() call of nested class - never pick 'this'
2997 thisArg = makeOwnerThisN(tree.meth.pos(), c, false);
2998 }
2999 tree.args = tree.args.prepend(thisArg);
3000 }
3001 } else {
3002 // We are seeing a normal method invocation; translate this as usual.
3003 tree.meth = translate(tree.meth);
3004
3005 // If the translated method itself is an Apply tree, we are
3006 // seeing an access method invocation. In this case, append
3007 // the method arguments to the arguments of the access method.
3008 if (tree.meth.hasTag(APPLY)) {
3009 JCMethodInvocation app = (JCMethodInvocation)tree.meth;
3010 app.args = tree.args.prependList(app.args);
3011 result = app;
3012 return;
3013 }
3014 }
3015 result = tree;
3016 }
3017
3018 List<JCExpression> boxArgs(List<Type> parameters, List<JCExpression> _args, Type varargsElement) {
3019 List<JCExpression> args = _args;
3020 if (parameters.isEmpty()) return args;
3021 boolean anyChanges = false;
3022 ListBuffer<JCExpression> result = new ListBuffer<JCExpression>();
3023 while (parameters.tail.nonEmpty()) {
3024 JCExpression arg = translate(args.head, parameters.head);
3025 anyChanges |= (arg != args.head);
3026 result.append(arg);
3027 args = args.tail;
3028 parameters = parameters.tail;
3029 }
3030 Type parameter = parameters.head;
3031 if (varargsElement != null) {
3032 anyChanges = true;
3033 ListBuffer<JCExpression> elems = new ListBuffer<JCExpression>();
3034 while (args.nonEmpty()) {
3035 JCExpression arg = translate(args.head, varargsElement);
3036 elems.append(arg);
3037 args = args.tail;
3038 }
3039 JCNewArray boxedArgs = make.NewArray(make.Type(varargsElement),
3040 List.<JCExpression>nil(),
3041 elems.toList());
3042 boxedArgs.type = new ArrayType(varargsElement, syms.arrayClass);
3043 result.append(boxedArgs);
3044 } else {
3045 if (args.length() != 1) throw new AssertionError(args);
3046 JCExpression arg = translate(args.head, parameter);
3047 anyChanges |= (arg != args.head);
3048 result.append(arg);
3049 if (!anyChanges) return _args;
3050 }
3051 return result.toList();
3052 }
3053
3054 /** Expand a boxing or unboxing conversion if needed. */
3055 @SuppressWarnings("unchecked") // XXX unchecked
3056 <T extends JCTree> T boxIfNeeded(T tree, Type type) {
3057 boolean havePrimitive = tree.type.isPrimitive();
3058 if (havePrimitive == type.isPrimitive())
3059 return tree;
3060 if (havePrimitive) {
3061 Type unboxedTarget = types.unboxedType(type);
3062 if (!unboxedTarget.hasTag(NONE)) {
3063 if (!types.isSubtype(tree.type, unboxedTarget)) //e.g. Character c = 89;
3064 tree.type = unboxedTarget.constType(tree.type.constValue());
3065 return (T)boxPrimitive((JCExpression)tree, type);
3066 } else {
3067 tree = (T)boxPrimitive((JCExpression)tree);
3068 }
3069 } else {
3070 tree = (T)unbox((JCExpression)tree, type);
3071 }
3072 return tree;
3073 }
3074
3075 /** Box up a single primitive expression. */
3076 JCExpression boxPrimitive(JCExpression tree) {
3077 return boxPrimitive(tree, types.boxedClass(tree.type).type);
3078 }
3079
3080 /** Box up a single primitive expression. */
3081 JCExpression boxPrimitive(JCExpression tree, Type box) {
3082 make_at(tree.pos());
3083 if (target.boxWithConstructors()) {
3084 Symbol ctor = lookupConstructor(tree.pos(),
3085 box,
3086 List.<Type>nil()
3087 .prepend(tree.type));
3088 return make.Create(ctor, List.of(tree));
3089 } else {
3090 Symbol valueOfSym = lookupMethod(tree.pos(),
3091 names.valueOf,
3092 box,
3093 List.<Type>nil()
3094 .prepend(tree.type));
3095 return make.App(make.QualIdent(valueOfSym), List.of(tree));
3096 }
3097 }
3098
3099 /** Unbox an object to a primitive value. */
3100 JCExpression unbox(JCExpression tree, Type primitive) {
3101 Type unboxedType = types.unboxedType(tree.type);
3102 if (unboxedType.hasTag(NONE)) {
3103 unboxedType = primitive;
3104 if (!unboxedType.isPrimitive())
3105 throw new AssertionError(unboxedType);
3106 make_at(tree.pos());
3107 tree = make.TypeCast(types.boxedClass(unboxedType).type, tree);
3108 } else {
3109 // There must be a conversion from unboxedType to primitive.
3110 if (!types.isSubtype(unboxedType, primitive))
3111 throw new AssertionError(tree);
3112 }
3113 make_at(tree.pos());
3114 Symbol valueSym = lookupMethod(tree.pos(),
3115 unboxedType.tsym.name.append(names.Value), // x.intValue()
3116 tree.type,
3117 List.<Type>nil());
3118 return make.App(make.Select(tree, valueSym));
3119 }
3120
3121 /** Visitor method for parenthesized expressions.
3122 * If the subexpression has changed, omit the parens.
3123 */
3124 public void visitParens(JCParens tree) {
3125 JCTree expr = translate(tree.expr);
3126 result = ((expr == tree.expr) ? tree : expr);
3127 }
3128
3129 public void visitIndexed(JCArrayAccess tree) {
3130 tree.indexed = translate(tree.indexed);
3131 tree.index = translate(tree.index, syms.intType);
3132 result = tree;
3133 }
3134
3135 public void visitAssign(JCAssign tree) {
3136 tree.lhs = translate(tree.lhs, tree);
3137 tree.rhs = translate(tree.rhs, tree.lhs.type);
3138
3139 // If translated left hand side is an Apply, we are
3140 // seeing an access method invocation. In this case, append
3141 // right hand side as last argument of the access method.
3142 if (tree.lhs.hasTag(APPLY)) {
3143 JCMethodInvocation app = (JCMethodInvocation)tree.lhs;
3144 app.args = List.of(tree.rhs).prependList(app.args);
3145 result = app;
3146 } else {
3147 result = tree;
3148 }
3149 }
3150
3151 public void visitAssignop(final JCAssignOp tree) {
3152 JCTree lhsAccess = access(TreeInfo.skipParens(tree.lhs));
3153 final boolean boxingReq = !tree.lhs.type.isPrimitive() &&
3154 tree.operator.type.getReturnType().isPrimitive();
3155
3156 if (boxingReq || lhsAccess.hasTag(APPLY)) {
3157 // boxing required; need to rewrite as x = (unbox typeof x)(x op y);
3158 // or if x == (typeof x)z then z = (unbox typeof x)((typeof x)z op y)
3159 // (but without recomputing x)
3160 JCTree newTree = abstractLval(tree.lhs, new TreeBuilder() {
3161 public JCTree build(final JCTree lhs) {
3162 JCTree.Tag newTag = tree.getTag().noAssignOp();
3163 // Erasure (TransTypes) can change the type of
3164 // tree.lhs. However, we can still get the
3165 // unerased type of tree.lhs as it is stored
3166 // in tree.type in Attr.
3167 Symbol newOperator = rs.resolveBinaryOperator(tree.pos(),
3168 newTag,
3169 attrEnv,
3170 tree.type,
3171 tree.rhs.type);
3172 JCExpression expr = (JCExpression)lhs;
3173 if (expr.type != tree.type)
3174 expr = make.TypeCast(tree.type, expr);
3175 JCBinary opResult = make.Binary(newTag, expr, tree.rhs);
3176 opResult.operator = newOperator;
3177 opResult.type = newOperator.type.getReturnType();
3178 JCExpression newRhs = boxingReq ?
3179 make.TypeCast(types.unboxedType(tree.type), opResult) :
3180 opResult;
3181 return make.Assign((JCExpression)lhs, newRhs).setType(tree.type);
3182 }
3183 });
3184 result = translate(newTree);
3185 return;
3186 }
3187 tree.lhs = translate(tree.lhs, tree);
3188 tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
3189
3190 // If translated left hand side is an Apply, we are
3191 // seeing an access method invocation. In this case, append
3192 // right hand side as last argument of the access method.
3193 if (tree.lhs.hasTag(APPLY)) {
3194 JCMethodInvocation app = (JCMethodInvocation)tree.lhs;
3195 // if operation is a += on strings,
3196 // make sure to convert argument to string
3197 JCExpression rhs = (((OperatorSymbol)tree.operator).opcode == string_add)
3198 ? makeString(tree.rhs)
3199 : tree.rhs;
3200 app.args = List.of(rhs).prependList(app.args);
3201 result = app;
3202 } else {
3203 result = tree;
3204 }
3205 }
3206
3207 /** Lower a tree of the form e++ or e-- where e is an object type */
3208 JCTree lowerBoxedPostop(final JCUnary tree) {
3209 // translate to tmp1=lval(e); tmp2=tmp1; tmp1 OP 1; tmp2
3210 // or
3211 // translate to tmp1=lval(e); tmp2=tmp1; (typeof tree)tmp1 OP 1; tmp2
3212 // where OP is += or -=
3213 final boolean cast = TreeInfo.skipParens(tree.arg).hasTag(TYPECAST);
3214 return abstractLval(tree.arg, new TreeBuilder() {
3215 public JCTree build(final JCTree tmp1) {
3216 return abstractRval(tmp1, tree.arg.type, new TreeBuilder() {
3217 public JCTree build(final JCTree tmp2) {
3218 JCTree.Tag opcode = (tree.hasTag(POSTINC))
3219 ? PLUS_ASG : MINUS_ASG;
3220 JCTree lhs = cast
3221 ? make.TypeCast(tree.arg.type, (JCExpression)tmp1)
3222 : tmp1;
3223 JCTree update = makeAssignop(opcode,
3224 lhs,
3225 make.Literal(1));
3226 return makeComma(update, tmp2);
3227 }
3228 });
3229 }
3230 });
3231 }
3232
3233 public void visitUnary(JCUnary tree) {
3234 boolean isUpdateOperator = tree.getTag().isIncOrDecUnaryOp();
3235 if (isUpdateOperator && !tree.arg.type.isPrimitive()) {
3236 switch(tree.getTag()) {
3237 case PREINC: // ++ e
3238 // translate to e += 1
3239 case PREDEC: // -- e
3240 // translate to e -= 1
3241 {
3242 JCTree.Tag opcode = (tree.hasTag(PREINC))
3243 ? PLUS_ASG : MINUS_ASG;
3244 JCAssignOp newTree = makeAssignop(opcode,
3245 tree.arg,
3246 make.Literal(1));
3247 result = translate(newTree, tree.type);
3248 return;
3249 }
3250 case POSTINC: // e ++
3251 case POSTDEC: // e --
3252 {
3253 result = translate(lowerBoxedPostop(tree), tree.type);
3254 return;
3255 }
3256 }
3257 throw new AssertionError(tree);
3258 }
3259
3260 tree.arg = boxIfNeeded(translate(tree.arg, tree), tree.type);
3261
3262 if (tree.hasTag(NOT) && tree.arg.type.constValue() != null) {
3263 tree.type = cfolder.fold1(bool_not, tree.arg.type);
3264 }
3265
3266 // If translated left hand side is an Apply, we are
3267 // seeing an access method invocation. In this case, return
3268 // that access method invocation as result.
3269 if (isUpdateOperator && tree.arg.hasTag(APPLY)) {
3270 result = tree.arg;
3271 } else {
3272 result = tree;
3273 }
3274 }
3275
3276 public void visitBinary(JCBinary tree) {
3277 List<Type> formals = tree.operator.type.getParameterTypes();
3278 JCTree lhs = tree.lhs = translate(tree.lhs, formals.head);
3279 switch (tree.getTag()) {
3280 case OR:
3281 if (lhs.type.isTrue()) {
3282 result = lhs;
3283 return;
3284 }
3285 if (lhs.type.isFalse()) {
3286 result = translate(tree.rhs, formals.tail.head);
3287 return;
3288 }
3289 break;
3290 case AND:
3291 if (lhs.type.isFalse()) {
3292 result = lhs;
3293 return;
3294 }
3295 if (lhs.type.isTrue()) {
3296 result = translate(tree.rhs, formals.tail.head);
3297 return;
3298 }
3299 break;
3300 }
3301 tree.rhs = translate(tree.rhs, formals.tail.head);
3302 result = tree;
3303 }
3304
3305 public void visitIdent(JCIdent tree) {
3306 result = access(tree.sym, tree, enclOp, false);
3307 }
3308
3309 /** Translate away the foreach loop. */
3310 public void visitForeachLoop(JCEnhancedForLoop tree) {
3311 if (types.elemtype(tree.expr.type) == null)
3312 visitIterableForeachLoop(tree);
3313 else
3314 visitArrayForeachLoop(tree);
3315 }
3316 // where
3317 /**
3318 * A statement of the form
3319 *
3320 * <pre>
3321 * for ( T v : arrayexpr ) stmt;
3322 * </pre>
3323 *
3324 * (where arrayexpr is of an array type) gets translated to
3325 *
3326 * <pre>{@code
3327 * for ( { arraytype #arr = arrayexpr;
3328 * int #len = array.length;
3329 * int #i = 0; };
3330 * #i < #len; i$++ ) {
3331 * T v = arr$[#i];
3332 * stmt;
3333 * }
3334 * }</pre>
3335 *
3336 * where #arr, #len, and #i are freshly named synthetic local variables.
3337 */
3338 private void visitArrayForeachLoop(JCEnhancedForLoop tree) {
3339 make_at(tree.expr.pos());
3340 VarSymbol arraycache = new VarSymbol(0,
3341 names.fromString("arr" + target.syntheticNameChar()),
3342 tree.expr.type,
3343 currentMethodSym);
3344 JCStatement arraycachedef = make.VarDef(arraycache, tree.expr);
3345 VarSymbol lencache = new VarSymbol(0,
3346 names.fromString("len" + target.syntheticNameChar()),
3347 syms.intType,
3348 currentMethodSym);
3349 JCStatement lencachedef = make.
3350 VarDef(lencache, make.Select(make.Ident(arraycache), syms.lengthVar));
3351 VarSymbol index = new VarSymbol(0,
3352 names.fromString("i" + target.syntheticNameChar()),
3353 syms.intType,
3354 currentMethodSym);
3355
3356 JCVariableDecl indexdef = make.VarDef(index, make.Literal(INT, 0));
3357 indexdef.init.type = indexdef.type = syms.intType.constType(0);
3358
3359 List<JCStatement> loopinit = List.of(arraycachedef, lencachedef, indexdef);
3360 JCBinary cond = makeBinary(LT, make.Ident(index), make.Ident(lencache));
3361
3362 JCExpressionStatement step = make.Exec(makeUnary(PREINC, make.Ident(index)));
3363
3364 Type elemtype = types.elemtype(tree.expr.type);
3365 JCExpression loopvarinit = make.Indexed(make.Ident(arraycache),
3366 make.Ident(index)).setType(elemtype);
3367 JCVariableDecl loopvardef = (JCVariableDecl)make.VarDef(tree.var.mods,
3368 tree.var.name,
3369 tree.var.vartype,
3370 loopvarinit).setType(tree.var.type);
3371 loopvardef.sym = tree.var.sym;
3372 JCBlock body = make.
3373 Block(0, List.of(loopvardef, tree.body));
3374
3375 result = translate(make.
3376 ForLoop(loopinit,
3377 cond,
3378 List.of(step),
3379 body));
3380 patchTargets(body, tree, result);
3381 }
3382 /** Patch up break and continue targets. */
3383 private void patchTargets(JCTree body, final JCTree src, final JCTree dest) {
3384 class Patcher extends TreeScanner {
3385 public void visitBreak(JCBreak tree) {
3386 if (tree.target == src)
3387 tree.target = dest;
3388 }
3389 public void visitContinue(JCContinue tree) {
3390 if (tree.target == src)
3391 tree.target = dest;
3392 }
3393 public void visitClassDef(JCClassDecl tree) {}
3394 }
3395 new Patcher().scan(body);
3396 }
3397 /**
3398 * A statement of the form
3399 *
3400 * <pre>
3401 * for ( T v : coll ) stmt ;
3402 * </pre>
3403 *
3404 * (where coll implements {@code Iterable<? extends T>}) gets translated to
3405 *
3406 * <pre>{@code
3407 * for ( Iterator<? extends T> #i = coll.iterator(); #i.hasNext(); ) {
3408 * T v = (T) #i.next();
3409 * stmt;
3410 * }
3411 * }</pre>
3412 *
3413 * where #i is a freshly named synthetic local variable.
3414 */
3415 private void visitIterableForeachLoop(JCEnhancedForLoop tree) {
3416 make_at(tree.expr.pos());
3417 Type iteratorTarget = syms.objectType;
3418 Type iterableType = types.asSuper(types.upperBound(tree.expr.type),
3419 syms.iterableType.tsym);
3420 if (iterableType.getTypeArguments().nonEmpty())
3421 iteratorTarget = types.erasure(iterableType.getTypeArguments().head);
3422 Type eType = tree.expr.type;
3423 while (eType.hasTag(TYPEVAR)) {
3424 eType = eType.getUpperBound();
3425 }
3426 tree.expr.type = types.erasure(eType);
3427 if (eType.isCompound())
3428 tree.expr = make.TypeCast(types.erasure(iterableType), tree.expr);
3429 Symbol iterator = lookupMethod(tree.expr.pos(),
3430 names.iterator,
3431 eType,
3432 List.<Type>nil());
3433 VarSymbol itvar = new VarSymbol(0, names.fromString("i" + target.syntheticNameChar()),
3434 types.erasure(iterator.type.getReturnType()),
3435 currentMethodSym);
3436
3437 JCStatement init = make.
3438 VarDef(itvar, make.App(make.Select(tree.expr, iterator)
3439 .setType(types.erasure(iterator.type))));
3440
3441 Symbol hasNext = lookupMethod(tree.expr.pos(),
3442 names.hasNext,
3443 itvar.type,
3444 List.<Type>nil());
3445 JCMethodInvocation cond = make.App(make.Select(make.Ident(itvar), hasNext));
3446 Symbol next = lookupMethod(tree.expr.pos(),
3447 names.next,
3448 itvar.type,
3449 List.<Type>nil());
3450 JCExpression vardefinit = make.App(make.Select(make.Ident(itvar), next));
3451 if (tree.var.type.isPrimitive())
3452 vardefinit = make.TypeCast(types.upperBound(iteratorTarget), vardefinit);
3453 else
3454 vardefinit = make.TypeCast(tree.var.type, vardefinit);
3455 JCVariableDecl indexDef = (JCVariableDecl)make.VarDef(tree.var.mods,
3456 tree.var.name,
3457 tree.var.vartype,
3458 vardefinit).setType(tree.var.type);
3459 indexDef.sym = tree.var.sym;
3460 JCBlock body = make.Block(0, List.of(indexDef, tree.body));
3461 body.endpos = TreeInfo.endPos(tree.body);
3462 result = translate(make.
3463 ForLoop(List.of(init),
3464 cond,
3465 List.<JCExpressionStatement>nil(),
3466 body));
3467 patchTargets(body, tree, result);
3468 }
3469
3470 public void visitVarDef(JCVariableDecl tree) {
3471 MethodSymbol oldMethodSym = currentMethodSym;
3472 tree.mods = translate(tree.mods);
3473 tree.vartype = translate(tree.vartype);
3474 if (currentMethodSym == null) {
3475 // A class or instance field initializer.
3476 currentMethodSym =
3477 new MethodSymbol((tree.mods.flags&STATIC) | BLOCK,
3478 names.empty, null,
3479 currentClass);
3480 }
3481 if (tree.init != null) tree.init = translate(tree.init, tree.type);
3482 result = tree;
3483 currentMethodSym = oldMethodSym;
3484 }
3485
3486 public void visitBlock(JCBlock tree) {
3487 MethodSymbol oldMethodSym = currentMethodSym;
3488 if (currentMethodSym == null) {
3489 // Block is a static or instance initializer.
3490 currentMethodSym =
3491 new MethodSymbol(tree.flags | BLOCK,
3492 names.empty, null,
3493 currentClass);
3494 }
3495 super.visitBlock(tree);
3496 currentMethodSym = oldMethodSym;
3497 }
3498
3499 public void visitDoLoop(JCDoWhileLoop tree) {
3500 tree.body = translate(tree.body);
3501 tree.cond = translate(tree.cond, syms.booleanType);
3502 result = tree;
3503 }
3504
3505 public void visitWhileLoop(JCWhileLoop tree) {
3506 tree.cond = translate(tree.cond, syms.booleanType);
3507 tree.body = translate(tree.body);
3508 result = tree;
3509 }
3510
3511 public void visitForLoop(JCForLoop tree) {
3512 tree.init = translate(tree.init);
3513 if (tree.cond != null)
3514 tree.cond = translate(tree.cond, syms.booleanType);
3515 tree.step = translate(tree.step);
3516 tree.body = translate(tree.body);
3517 result = tree;
3518 }
3519
3520 public void visitReturn(JCReturn tree) {
3521 if (tree.expr != null)
3522 tree.expr = translate(tree.expr,
3523 types.erasure(currentMethodDef
3524 .restype.type));
3525 result = tree;
3526 }
3527
3528 public void visitSwitch(JCSwitch tree) {
3529 Type selsuper = types.supertype(tree.selector.type);
3530 boolean enumSwitch = selsuper != null &&
3531 (tree.selector.type.tsym.flags() & ENUM) != 0;
3532 boolean stringSwitch = selsuper != null &&
3533 types.isSameType(tree.selector.type, syms.stringType);
3534 Type target = enumSwitch ? tree.selector.type :
3535 (stringSwitch? syms.stringType : syms.intType);
3536 tree.selector = translate(tree.selector, target);
3537 tree.cases = translateCases(tree.cases);
3538 if (enumSwitch) {
3539 result = visitEnumSwitch(tree);
3540 } else if (stringSwitch) {
3541 result = visitStringSwitch(tree);
3542 } else {
3543 result = tree;
3544 }
3545 }
3546
3547 public JCTree visitEnumSwitch(JCSwitch tree) {
3548 TypeSymbol enumSym = tree.selector.type.tsym;
3549 EnumMapping map = mapForEnum(tree.pos(), enumSym);
3550 make_at(tree.pos());
3551 Symbol ordinalMethod = lookupMethod(tree.pos(),
3552 names.ordinal,
3553 tree.selector.type,
3554 List.<Type>nil());
3555 JCArrayAccess selector = make.Indexed(map.mapVar,
3556 make.App(make.Select(tree.selector,
3557 ordinalMethod)));
3558 ListBuffer<JCCase> cases = new ListBuffer<JCCase>();
3559 for (JCCase c : tree.cases) {
3560 if (c.pat != null) {
3561 VarSymbol label = (VarSymbol)TreeInfo.symbol(c.pat);
3562 JCLiteral pat = map.forConstant(label);
3563 cases.append(make.Case(pat, c.stats));
3564 } else {
3565 cases.append(c);
3566 }
3567 }
3568 JCSwitch enumSwitch = make.Switch(selector, cases.toList());
3569 patchTargets(enumSwitch, tree, enumSwitch);
3570 return enumSwitch;
3571 }
3572
3573 public JCTree visitStringSwitch(JCSwitch tree) {
3574 List<JCCase> caseList = tree.getCases();
3575 int alternatives = caseList.size();
3576
3577 if (alternatives == 0) { // Strange but legal possibility
3578 return make.at(tree.pos()).Exec(attr.makeNullCheck(tree.getExpression()));
3579 } else {
3580 /*
3581 * The general approach used is to translate a single
3582 * string switch statement into a series of two chained
3583 * switch statements: the first a synthesized statement
3584 * switching on the argument string's hash value and
3585 * computing a string's position in the list of original
3586 * case labels, if any, followed by a second switch on the
3587 * computed integer value. The second switch has the same
3588 * code structure as the original string switch statement
3589 * except that the string case labels are replaced with
3590 * positional integer constants starting at 0.
3591 *
3592 * The first switch statement can be thought of as an
3593 * inlined map from strings to their position in the case
3594 * label list. An alternate implementation would use an
3595 * actual Map for this purpose, as done for enum switches.
3596 *
3597 * With some additional effort, it would be possible to
3598 * use a single switch statement on the hash code of the
3599 * argument, but care would need to be taken to preserve
3600 * the proper control flow in the presence of hash
3601 * collisions and other complications, such as
3602 * fallthroughs. Switch statements with one or two
3603 * alternatives could also be specially translated into
3604 * if-then statements to omit the computation of the hash
3605 * code.
3606 *
3607 * The generated code assumes that the hashing algorithm
3608 * of String is the same in the compilation environment as
3609 * in the environment the code will run in. The string
3610 * hashing algorithm in the SE JDK has been unchanged
3611 * since at least JDK 1.2. Since the algorithm has been
3612 * specified since that release as well, it is very
3613 * unlikely to be changed in the future.
3614 *
3615 * Different hashing algorithms, such as the length of the
3616 * strings or a perfect hashing algorithm over the
3617 * particular set of case labels, could potentially be
3618 * used instead of String.hashCode.
3619 */
3620
3621 ListBuffer<JCStatement> stmtList = new ListBuffer<JCStatement>();
3622
3623 // Map from String case labels to their original position in
3624 // the list of case labels.
3625 Map<String, Integer> caseLabelToPosition =
3626 new LinkedHashMap<String, Integer>(alternatives + 1, 1.0f);
3627
3628 // Map of hash codes to the string case labels having that hashCode.
3629 Map<Integer, Set<String>> hashToString =
3630 new LinkedHashMap<Integer, Set<String>>(alternatives + 1, 1.0f);
3631
3632 int casePosition = 0;
3633 for(JCCase oneCase : caseList) {
3634 JCExpression expression = oneCase.getExpression();
3635
3636 if (expression != null) { // expression for a "default" case is null
3637 String labelExpr = (String) expression.type.constValue();
3638 Integer mapping = caseLabelToPosition.put(labelExpr, casePosition);
3639 Assert.checkNull(mapping);
3640 int hashCode = labelExpr.hashCode();
3641
3642 Set<String> stringSet = hashToString.get(hashCode);
3643 if (stringSet == null) {
3644 stringSet = new LinkedHashSet<String>(1, 1.0f);
3645 stringSet.add(labelExpr);
3646 hashToString.put(hashCode, stringSet);
3647 } else {
3648 boolean added = stringSet.add(labelExpr);
3649 Assert.check(added);
3650 }
3651 }
3652 casePosition++;
3653 }
3654
3655 // Synthesize a switch statement that has the effect of
3656 // mapping from a string to the integer position of that
3657 // string in the list of case labels. This is done by
3658 // switching on the hashCode of the string followed by an
3659 // if-then-else chain comparing the input for equality
3660 // with all the case labels having that hash value.
3661
3662 /*
3663 * s$ = top of stack;
3664 * tmp$ = -1;
3665 * switch($s.hashCode()) {
3666 * case caseLabel.hashCode:
3667 * if (s$.equals("caseLabel_1")
3668 * tmp$ = caseLabelToPosition("caseLabel_1");
3669 * else if (s$.equals("caseLabel_2"))
3670 * tmp$ = caseLabelToPosition("caseLabel_2");
3671 * ...
3672 * break;
3673 * ...
3674 * }
3675 */
3676
3677 VarSymbol dollar_s = new VarSymbol(FINAL|SYNTHETIC,
3678 names.fromString("s" + tree.pos + target.syntheticNameChar()),
3679 syms.stringType,
3680 currentMethodSym);
3681 stmtList.append(make.at(tree.pos()).VarDef(dollar_s, tree.getExpression()).setType(dollar_s.type));
3682
3683 VarSymbol dollar_tmp = new VarSymbol(SYNTHETIC,
3684 names.fromString("tmp" + tree.pos + target.syntheticNameChar()),
3685 syms.intType,
3686 currentMethodSym);
3687 JCVariableDecl dollar_tmp_def =
3688 (JCVariableDecl)make.VarDef(dollar_tmp, make.Literal(INT, -1)).setType(dollar_tmp.type);
3689 dollar_tmp_def.init.type = dollar_tmp.type = syms.intType;
3690 stmtList.append(dollar_tmp_def);
3691 ListBuffer<JCCase> caseBuffer = ListBuffer.lb();
3692 // hashCode will trigger nullcheck on original switch expression
3693 JCMethodInvocation hashCodeCall = makeCall(make.Ident(dollar_s),
3694 names.hashCode,
3695 List.<JCExpression>nil()).setType(syms.intType);
3696 JCSwitch switch1 = make.Switch(hashCodeCall,
3697 caseBuffer.toList());
3698 for(Map.Entry<Integer, Set<String>> entry : hashToString.entrySet()) {
3699 int hashCode = entry.getKey();
3700 Set<String> stringsWithHashCode = entry.getValue();
3701 Assert.check(stringsWithHashCode.size() >= 1);
3702
3703 JCStatement elsepart = null;
3704 for(String caseLabel : stringsWithHashCode ) {
3705 JCMethodInvocation stringEqualsCall = makeCall(make.Ident(dollar_s),
3706 names.equals,
3707 List.<JCExpression>of(make.Literal(caseLabel)));
3708 elsepart = make.If(stringEqualsCall,
3709 make.Exec(make.Assign(make.Ident(dollar_tmp),
3710 make.Literal(caseLabelToPosition.get(caseLabel))).
3711 setType(dollar_tmp.type)),
3712 elsepart);
3713 }
3714
3715 ListBuffer<JCStatement> lb = ListBuffer.lb();
3716 JCBreak breakStmt = make.Break(null);
3717 breakStmt.target = switch1;
3718 lb.append(elsepart).append(breakStmt);
3719
3720 caseBuffer.append(make.Case(make.Literal(hashCode), lb.toList()));
3721 }
3722
3723 switch1.cases = caseBuffer.toList();
3724 stmtList.append(switch1);
3725
3726 // Make isomorphic switch tree replacing string labels
3727 // with corresponding integer ones from the label to
3728 // position map.
3729
3730 ListBuffer<JCCase> lb = ListBuffer.lb();
3731 JCSwitch switch2 = make.Switch(make.Ident(dollar_tmp), lb.toList());
3732 for(JCCase oneCase : caseList ) {
3733 // Rewire up old unlabeled break statements to the
3734 // replacement switch being created.
3735 patchTargets(oneCase, tree, switch2);
3736
3737 boolean isDefault = (oneCase.getExpression() == null);
3738 JCExpression caseExpr;
3739 if (isDefault)
3740 caseExpr = null;
3741 else {
3742 caseExpr = make.Literal(caseLabelToPosition.get((String)TreeInfo.skipParens(oneCase.
3743 getExpression()).
3744 type.constValue()));
3745 }
3746
3747 lb.append(make.Case(caseExpr,
3748 oneCase.getStatements()));
3749 }
3750
3751 switch2.cases = lb.toList();
3752 stmtList.append(switch2);
3753
3754 return make.Block(0L, stmtList.toList());
3755 }
3756 }
3757
3758 public void visitNewArray(JCNewArray tree) {
3759 tree.elemtype = translate(tree.elemtype);
3760 for (List<JCExpression> t = tree.dims; t.tail != null; t = t.tail)
3761 if (t.head != null) t.head = translate(t.head, syms.intType);
3762 tree.elems = translate(tree.elems, types.elemtype(tree.type));
3763 result = tree;
3764 }
3765
3766 public void visitSelect(JCFieldAccess tree) {
3767 // need to special case-access of the form C.super.x
3768 // these will always need an access method, unless C
3769 // is a default interface subclassed by the current class.
3770 boolean qualifiedSuperAccess =
3771 tree.selected.hasTag(SELECT) &&
3772 TreeInfo.name(tree.selected) == names._super &&
3773 !types.isDirectSuperInterface(((JCFieldAccess)tree.selected).selected.type.tsym, currentClass);
3774 tree.selected = translate(tree.selected);
3775 if (tree.name == names._class) {
3776 result = classOf(tree.selected);
3777 }
3778 else if (tree.name == names._super &&
3779 types.isDirectSuperInterface(tree.selected.type.tsym, currentClass)) {
3780 //default super call!! Not a classic qualified super call
3781 TypeSymbol supSym = tree.selected.type.tsym;
3782 Assert.checkNonNull(types.asSuper(currentClass.type, supSym));
3783 result = tree;
3784 }
3785 else if (tree.name == names._this || tree.name == names._super) {
3786 result = makeThis(tree.pos(), tree.selected.type.tsym);
3787 }
3788 else
3789 result = access(tree.sym, tree, enclOp, qualifiedSuperAccess);
3790 }
3791
3792 public void visitLetExpr(LetExpr tree) {
3793 tree.defs = translateVarDefs(tree.defs);
3794 tree.expr = translate(tree.expr, tree.type);
3795 result = tree;
3796 }
3797
3798 // There ought to be nothing to rewrite here;
3799 // we don't generate code.
3800 public void visitAnnotation(JCAnnotation tree) {
3801 result = tree;
3802 }
3803
3804 @Override
3805 public void visitTry(JCTry tree) {
3806 /* special case of try without catchers and with finally emtpy.
3807 * Don't give it a try, translate only the body.
3808 */
3809 if (tree.resources.isEmpty()) {
3810 if (tree.catchers.isEmpty() &&
3811 tree.finalizer.getStatements().isEmpty()) {
3812 result = translate(tree.body);
3813 } else {
3814 super.visitTry(tree);
3815 }
3816 } else {
3817 result = makeTwrTry(tree);
3818 }
3819 }
3820
3821 /**************************************************************************
3822 * main method
3823 *************************************************************************/
3824
3825 /** Translate a toplevel class and return a list consisting of
3826 * the translated class and translated versions of all inner classes.
3827 * @param env The attribution environment current at the class definition.
3828 * We need this for resolving some additional symbols.
3829 * @param cdef The tree representing the class definition.
3830 */
3831 public List<JCTree> translateTopLevelClass(Env<AttrContext> env, JCTree cdef, TreeMaker make) {
3832 ListBuffer<JCTree> translated = null;
3833 try {
3834 attrEnv = env;
3835 this.make = make;
3836 endPosTable = env.toplevel.endPositions;
3837 currentClass = null;
3838 currentMethodDef = null;
3839 outermostClassDef = (cdef.hasTag(CLASSDEF)) ? (JCClassDecl)cdef : null;
3840 outermostMemberDef = null;
3841 this.translated = new ListBuffer<JCTree>();
3842 classdefs = new HashMap<ClassSymbol,JCClassDecl>();
3843 actualSymbols = new HashMap<Symbol,Symbol>();
3844 freevarCache = new HashMap<ClassSymbol,List<VarSymbol>>();
3845 proxies = new Scope(syms.noSymbol);
3846 twrVars = new Scope(syms.noSymbol);
3847 outerThisStack = List.nil();
3848 accessNums = new HashMap<Symbol,Integer>();
3849 accessSyms = new HashMap<Symbol,MethodSymbol[]>();
3850 accessConstrs = new HashMap<Symbol,MethodSymbol>();
3851 accessConstrTags = List.nil();
3852 accessed = new ListBuffer<Symbol>();
3853 translate(cdef, (JCExpression)null);
3854 for (List<Symbol> l = accessed.toList(); l.nonEmpty(); l = l.tail)
3855 makeAccessible(l.head);
3856 for (EnumMapping map : enumSwitchMap.values())
3857 map.translate();
3858 checkConflicts(this.translated.toList());
3859 checkAccessConstructorTags();
3860 translated = this.translated;
3861 } finally {
3862 // note that recursive invocations of this method fail hard
3863 attrEnv = null;
3864 this.make = null;
3865 endPosTable = null;
3866 currentClass = null;
3867 currentMethodDef = null;
3868 outermostClassDef = null;
3869 outermostMemberDef = null;
3870 this.translated = null;
3871 classdefs = null;
3872 actualSymbols = null;
3873 freevarCache = null;
3874 proxies = null;
3875 outerThisStack = null;
3876 accessNums = null;
3877 accessSyms = null;
3878 accessConstrs = null;
3879 accessConstrTags = null;
3880 accessed = null;
3881 enumSwitchMap.clear();
3882 }
3883 return translated.toList();
3884 }
3885 }