Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@8227961c64d3
src/share/classes/com/sun/tools/javac/tree/TreeInfo.java
Tue, 11 Aug 2009 01:13:14 +0100
- author
- mcimadamore
- date
- Tue, 11 Aug 2009 01:13:14 +0100
- changeset 359
- 8227961c64d3
- parent 308
- 03944ee4fac4
- child 383
- 8109aa93b212
- permissions
- -rw-r--r--
6521805: Regression: JDK5/JDK6 javac allows write access to outer class reference
Summary: javac should warn/complain about identifiers with the same name as synthetic symbol
Reviewed-by: jjg
1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.tree;
28 import com.sun.source.tree.Tree;
29 import com.sun.tools.javac.comp.AttrContext;
30 import com.sun.tools.javac.comp.Env;
31 import java.util.Map;
32 import com.sun.tools.javac.util.*;
33 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
34 import com.sun.tools.javac.code.*;
35 import com.sun.tools.javac.tree.JCTree.*;
37 import static com.sun.tools.javac.code.Flags.*;
39 /** Utility class containing inspector methods for trees.
40 *
41 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
42 * you write code that depends on this, you do so at your own risk.
43 * This code and its internal interfaces are subject to change or
44 * deletion without notice.</b>
45 */
46 public class TreeInfo {
47 protected static final Context.Key<TreeInfo> treeInfoKey =
48 new Context.Key<TreeInfo>();
50 public static TreeInfo instance(Context context) {
51 TreeInfo instance = context.get(treeInfoKey);
52 if (instance == null)
53 instance = new TreeInfo(context);
54 return instance;
55 }
57 /** The names of all operators.
58 */
59 private Name[] opname = new Name[JCTree.MOD - JCTree.POS + 1];
61 private TreeInfo(Context context) {
62 context.put(treeInfoKey, this);
64 Names names = Names.instance(context);
65 opname[JCTree.POS - JCTree.POS] = names.fromString("+");
66 opname[JCTree.NEG - JCTree.POS] = names.hyphen;
67 opname[JCTree.NOT - JCTree.POS] = names.fromString("!");
68 opname[JCTree.COMPL - JCTree.POS] = names.fromString("~");
69 opname[JCTree.PREINC - JCTree.POS] = names.fromString("++");
70 opname[JCTree.PREDEC - JCTree.POS] = names.fromString("--");
71 opname[JCTree.POSTINC - JCTree.POS] = names.fromString("++");
72 opname[JCTree.POSTDEC - JCTree.POS] = names.fromString("--");
73 opname[JCTree.NULLCHK - JCTree.POS] = names.fromString("<*nullchk*>");
74 opname[JCTree.OR - JCTree.POS] = names.fromString("||");
75 opname[JCTree.AND - JCTree.POS] = names.fromString("&&");
76 opname[JCTree.EQ - JCTree.POS] = names.fromString("==");
77 opname[JCTree.NE - JCTree.POS] = names.fromString("!=");
78 opname[JCTree.LT - JCTree.POS] = names.fromString("<");
79 opname[JCTree.GT - JCTree.POS] = names.fromString(">");
80 opname[JCTree.LE - JCTree.POS] = names.fromString("<=");
81 opname[JCTree.GE - JCTree.POS] = names.fromString(">=");
82 opname[JCTree.BITOR - JCTree.POS] = names.fromString("|");
83 opname[JCTree.BITXOR - JCTree.POS] = names.fromString("^");
84 opname[JCTree.BITAND - JCTree.POS] = names.fromString("&");
85 opname[JCTree.SL - JCTree.POS] = names.fromString("<<");
86 opname[JCTree.SR - JCTree.POS] = names.fromString(">>");
87 opname[JCTree.USR - JCTree.POS] = names.fromString(">>>");
88 opname[JCTree.PLUS - JCTree.POS] = names.fromString("+");
89 opname[JCTree.MINUS - JCTree.POS] = names.hyphen;
90 opname[JCTree.MUL - JCTree.POS] = names.asterisk;
91 opname[JCTree.DIV - JCTree.POS] = names.slash;
92 opname[JCTree.MOD - JCTree.POS] = names.fromString("%");
93 }
96 /** Return name of operator with given tree tag.
97 */
98 public Name operatorName(int tag) {
99 return opname[tag - JCTree.POS];
100 }
102 /** Is tree a constructor declaration?
103 */
104 public static boolean isConstructor(JCTree tree) {
105 if (tree.getTag() == JCTree.METHODDEF) {
106 Name name = ((JCMethodDecl) tree).name;
107 return name == name.table.names.init;
108 } else {
109 return false;
110 }
111 }
113 /** Is there a constructor declaration in the given list of trees?
114 */
115 public static boolean hasConstructors(List<JCTree> trees) {
116 for (List<JCTree> l = trees; l.nonEmpty(); l = l.tail)
117 if (isConstructor(l.head)) return true;
118 return false;
119 }
121 /** Is statement an initializer for a synthetic field?
122 */
123 public static boolean isSyntheticInit(JCTree stat) {
124 if (stat.getTag() == JCTree.EXEC) {
125 JCExpressionStatement exec = (JCExpressionStatement)stat;
126 if (exec.expr.getTag() == JCTree.ASSIGN) {
127 JCAssign assign = (JCAssign)exec.expr;
128 if (assign.lhs.getTag() == JCTree.SELECT) {
129 JCFieldAccess select = (JCFieldAccess)assign.lhs;
130 if (select.sym != null &&
131 (select.sym.flags() & SYNTHETIC) != 0) {
132 Name selected = name(select.selected);
133 if (selected != null && selected == selected.table.names._this)
134 return true;
135 }
136 }
137 }
138 }
139 return false;
140 }
142 /** If the expression is a method call, return the method name, null
143 * otherwise. */
144 public static Name calledMethodName(JCTree tree) {
145 if (tree.getTag() == JCTree.EXEC) {
146 JCExpressionStatement exec = (JCExpressionStatement)tree;
147 if (exec.expr.getTag() == JCTree.APPLY) {
148 Name mname = TreeInfo.name(((JCMethodInvocation) exec.expr).meth);
149 return mname;
150 }
151 }
152 return null;
153 }
155 /** Is this a call to this or super?
156 */
157 public static boolean isSelfCall(JCTree tree) {
158 Name name = calledMethodName(tree);
159 if (name != null) {
160 Names names = name.table.names;
161 return name==names._this || name==names._super;
162 } else {
163 return false;
164 }
165 }
167 /** Is this a call to super?
168 */
169 public static boolean isSuperCall(JCTree tree) {
170 Name name = calledMethodName(tree);
171 if (name != null) {
172 Names names = name.table.names;
173 return name==names._super;
174 } else {
175 return false;
176 }
177 }
179 /** Is this a constructor whose first (non-synthetic) statement is not
180 * of the form this(...)?
181 */
182 public static boolean isInitialConstructor(JCTree tree) {
183 JCMethodInvocation app = firstConstructorCall(tree);
184 if (app == null) return false;
185 Name meth = name(app.meth);
186 return meth == null || meth != meth.table.names._this;
187 }
189 /** Return the first call in a constructor definition. */
190 public static JCMethodInvocation firstConstructorCall(JCTree tree) {
191 if (tree.getTag() != JCTree.METHODDEF) return null;
192 JCMethodDecl md = (JCMethodDecl) tree;
193 Names names = md.name.table.names;
194 if (md.name != names.init) return null;
195 if (md.body == null) return null;
196 List<JCStatement> stats = md.body.stats;
197 // Synthetic initializations can appear before the super call.
198 while (stats.nonEmpty() && isSyntheticInit(stats.head))
199 stats = stats.tail;
200 if (stats.isEmpty()) return null;
201 if (stats.head.getTag() != JCTree.EXEC) return null;
202 JCExpressionStatement exec = (JCExpressionStatement) stats.head;
203 if (exec.expr.getTag() != JCTree.APPLY) return null;
204 return (JCMethodInvocation)exec.expr;
205 }
207 /** Return true if a tree represents the null literal. */
208 public static boolean isNull(JCTree tree) {
209 if (tree.getTag() != JCTree.LITERAL)
210 return false;
211 JCLiteral lit = (JCLiteral) tree;
212 return (lit.typetag == TypeTags.BOT);
213 }
215 /** The position of the first statement in a block, or the position of
216 * the block itself if it is empty.
217 */
218 public static int firstStatPos(JCTree tree) {
219 if (tree.getTag() == JCTree.BLOCK && ((JCBlock) tree).stats.nonEmpty())
220 return ((JCBlock) tree).stats.head.pos;
221 else
222 return tree.pos;
223 }
225 /** The end position of given tree, if it is a block with
226 * defined endpos.
227 */
228 public static int endPos(JCTree tree) {
229 if (tree.getTag() == JCTree.BLOCK && ((JCBlock) tree).endpos != Position.NOPOS)
230 return ((JCBlock) tree).endpos;
231 else if (tree.getTag() == JCTree.SYNCHRONIZED)
232 return endPos(((JCSynchronized) tree).body);
233 else if (tree.getTag() == JCTree.TRY) {
234 JCTry t = (JCTry) tree;
235 return endPos((t.finalizer != null)
236 ? t.finalizer
237 : t.catchers.last().body);
238 } else
239 return tree.pos;
240 }
243 /** Get the start position for a tree node. The start position is
244 * defined to be the position of the first character of the first
245 * token of the node's source text.
246 * @param tree The tree node
247 */
248 public static int getStartPos(JCTree tree) {
249 if (tree == null)
250 return Position.NOPOS;
252 switch(tree.getTag()) {
253 case(JCTree.APPLY):
254 return getStartPos(((JCMethodInvocation) tree).meth);
255 case(JCTree.ASSIGN):
256 return getStartPos(((JCAssign) tree).lhs);
257 case(JCTree.BITOR_ASG): case(JCTree.BITXOR_ASG): case(JCTree.BITAND_ASG):
258 case(JCTree.SL_ASG): case(JCTree.SR_ASG): case(JCTree.USR_ASG):
259 case(JCTree.PLUS_ASG): case(JCTree.MINUS_ASG): case(JCTree.MUL_ASG):
260 case(JCTree.DIV_ASG): case(JCTree.MOD_ASG):
261 return getStartPos(((JCAssignOp) tree).lhs);
262 case(JCTree.OR): case(JCTree.AND): case(JCTree.BITOR):
263 case(JCTree.BITXOR): case(JCTree.BITAND): case(JCTree.EQ):
264 case(JCTree.NE): case(JCTree.LT): case(JCTree.GT):
265 case(JCTree.LE): case(JCTree.GE): case(JCTree.SL):
266 case(JCTree.SR): case(JCTree.USR): case(JCTree.PLUS):
267 case(JCTree.MINUS): case(JCTree.MUL): case(JCTree.DIV):
268 case(JCTree.MOD):
269 return getStartPos(((JCBinary) tree).lhs);
270 case(JCTree.CLASSDEF): {
271 JCClassDecl node = (JCClassDecl)tree;
272 if (node.mods.pos != Position.NOPOS)
273 return node.mods.pos;
274 break;
275 }
276 case(JCTree.CONDEXPR):
277 return getStartPos(((JCConditional) tree).cond);
278 case(JCTree.EXEC):
279 return getStartPos(((JCExpressionStatement) tree).expr);
280 case(JCTree.INDEXED):
281 return getStartPos(((JCArrayAccess) tree).indexed);
282 case(JCTree.METHODDEF): {
283 JCMethodDecl node = (JCMethodDecl)tree;
284 if (node.mods.pos != Position.NOPOS)
285 return node.mods.pos;
286 if (node.typarams.nonEmpty()) // List.nil() used for no typarams
287 return getStartPos(node.typarams.head);
288 return node.restype == null ? node.pos : getStartPos(node.restype);
289 }
290 case(JCTree.SELECT):
291 return getStartPos(((JCFieldAccess) tree).selected);
292 case(JCTree.TYPEAPPLY):
293 return getStartPos(((JCTypeApply) tree).clazz);
294 case(JCTree.TYPEARRAY):
295 return getStartPos(((JCArrayTypeTree) tree).elemtype);
296 case(JCTree.TYPETEST):
297 return getStartPos(((JCInstanceOf) tree).expr);
298 case(JCTree.POSTINC):
299 case(JCTree.POSTDEC):
300 return getStartPos(((JCUnary) tree).arg);
301 case(JCTree.ANNOTATED_TYPE):
302 return getStartPos(((JCAnnotatedType) tree).underlyingType);
303 case(JCTree.VARDEF): {
304 JCVariableDecl node = (JCVariableDecl)tree;
305 if (node.mods.pos != Position.NOPOS) {
306 return node.mods.pos;
307 } else {
308 return getStartPos(node.vartype);
309 }
310 }
311 case(JCTree.ERRONEOUS): {
312 JCErroneous node = (JCErroneous)tree;
313 if (node.errs != null && node.errs.nonEmpty())
314 return getStartPos(node.errs.head);
315 }
316 }
317 return tree.pos;
318 }
320 /** The end position of given tree, given a table of end positions generated by the parser
321 */
322 public static int getEndPos(JCTree tree, Map<JCTree, Integer> endPositions) {
323 if (tree == null)
324 return Position.NOPOS;
326 if (endPositions == null) {
327 // fall back on limited info in the tree
328 return endPos(tree);
329 }
331 Integer mapPos = endPositions.get(tree);
332 if (mapPos != null)
333 return mapPos;
335 switch(tree.getTag()) {
336 case(JCTree.BITOR_ASG): case(JCTree.BITXOR_ASG): case(JCTree.BITAND_ASG):
337 case(JCTree.SL_ASG): case(JCTree.SR_ASG): case(JCTree.USR_ASG):
338 case(JCTree.PLUS_ASG): case(JCTree.MINUS_ASG): case(JCTree.MUL_ASG):
339 case(JCTree.DIV_ASG): case(JCTree.MOD_ASG):
340 return getEndPos(((JCAssignOp) tree).rhs, endPositions);
341 case(JCTree.OR): case(JCTree.AND): case(JCTree.BITOR):
342 case(JCTree.BITXOR): case(JCTree.BITAND): case(JCTree.EQ):
343 case(JCTree.NE): case(JCTree.LT): case(JCTree.GT):
344 case(JCTree.LE): case(JCTree.GE): case(JCTree.SL):
345 case(JCTree.SR): case(JCTree.USR): case(JCTree.PLUS):
346 case(JCTree.MINUS): case(JCTree.MUL): case(JCTree.DIV):
347 case(JCTree.MOD):
348 return getEndPos(((JCBinary) tree).rhs, endPositions);
349 case(JCTree.CASE):
350 return getEndPos(((JCCase) tree).stats.last(), endPositions);
351 case(JCTree.CATCH):
352 return getEndPos(((JCCatch) tree).body, endPositions);
353 case(JCTree.CONDEXPR):
354 return getEndPos(((JCConditional) tree).falsepart, endPositions);
355 case(JCTree.FORLOOP):
356 return getEndPos(((JCForLoop) tree).body, endPositions);
357 case(JCTree.FOREACHLOOP):
358 return getEndPos(((JCEnhancedForLoop) tree).body, endPositions);
359 case(JCTree.IF): {
360 JCIf node = (JCIf)tree;
361 if (node.elsepart == null) {
362 return getEndPos(node.thenpart, endPositions);
363 } else {
364 return getEndPos(node.elsepart, endPositions);
365 }
366 }
367 case(JCTree.LABELLED):
368 return getEndPos(((JCLabeledStatement) tree).body, endPositions);
369 case(JCTree.MODIFIERS):
370 return getEndPos(((JCModifiers) tree).annotations.last(), endPositions);
371 case(JCTree.SYNCHRONIZED):
372 return getEndPos(((JCSynchronized) tree).body, endPositions);
373 case(JCTree.TOPLEVEL):
374 return getEndPos(((JCCompilationUnit) tree).defs.last(), endPositions);
375 case(JCTree.TRY): {
376 JCTry node = (JCTry)tree;
377 if (node.finalizer != null) {
378 return getEndPos(node.finalizer, endPositions);
379 } else if (!node.catchers.isEmpty()) {
380 return getEndPos(node.catchers.last(), endPositions);
381 } else {
382 return getEndPos(node.body, endPositions);
383 }
384 }
385 case(JCTree.WILDCARD):
386 return getEndPos(((JCWildcard) tree).inner, endPositions);
387 case(JCTree.TYPECAST):
388 return getEndPos(((JCTypeCast) tree).expr, endPositions);
389 case(JCTree.TYPETEST):
390 return getEndPos(((JCInstanceOf) tree).clazz, endPositions);
391 case(JCTree.POS):
392 case(JCTree.NEG):
393 case(JCTree.NOT):
394 case(JCTree.COMPL):
395 case(JCTree.PREINC):
396 case(JCTree.PREDEC):
397 return getEndPos(((JCUnary) tree).arg, endPositions);
398 case(JCTree.WHILELOOP):
399 return getEndPos(((JCWhileLoop) tree).body, endPositions);
400 case(JCTree.ERRONEOUS): {
401 JCErroneous node = (JCErroneous)tree;
402 if (node.errs != null && node.errs.nonEmpty())
403 return getEndPos(node.errs.last(), endPositions);
404 }
405 }
406 return Position.NOPOS;
407 }
410 /** A DiagnosticPosition with the preferred position set to the
411 * end position of given tree, if it is a block with
412 * defined endpos.
413 */
414 public static DiagnosticPosition diagEndPos(final JCTree tree) {
415 final int endPos = TreeInfo.endPos(tree);
416 return new DiagnosticPosition() {
417 public JCTree getTree() { return tree; }
418 public int getStartPosition() { return TreeInfo.getStartPos(tree); }
419 public int getPreferredPosition() { return endPos; }
420 public int getEndPosition(Map<JCTree, Integer> endPosTable) {
421 return TreeInfo.getEndPos(tree, endPosTable);
422 }
423 };
424 }
426 /** The position of the finalizer of given try/synchronized statement.
427 */
428 public static int finalizerPos(JCTree tree) {
429 if (tree.getTag() == JCTree.TRY) {
430 JCTry t = (JCTry) tree;
431 assert t.finalizer != null;
432 return firstStatPos(t.finalizer);
433 } else if (tree.getTag() == JCTree.SYNCHRONIZED) {
434 return endPos(((JCSynchronized) tree).body);
435 } else {
436 throw new AssertionError();
437 }
438 }
440 /** Find the position for reporting an error about a symbol, where
441 * that symbol is defined somewhere in the given tree. */
442 public static int positionFor(final Symbol sym, final JCTree tree) {
443 JCTree decl = declarationFor(sym, tree);
444 return ((decl != null) ? decl : tree).pos;
445 }
447 /** Find the position for reporting an error about a symbol, where
448 * that symbol is defined somewhere in the given tree. */
449 public static DiagnosticPosition diagnosticPositionFor(final Symbol sym, final JCTree tree) {
450 JCTree decl = declarationFor(sym, tree);
451 return ((decl != null) ? decl : tree).pos();
452 }
454 /** Find the declaration for a symbol, where
455 * that symbol is defined somewhere in the given tree. */
456 public static JCTree declarationFor(final Symbol sym, final JCTree tree) {
457 class DeclScanner extends TreeScanner {
458 JCTree result = null;
459 public void scan(JCTree tree) {
460 if (tree!=null && result==null)
461 tree.accept(this);
462 }
463 public void visitTopLevel(JCCompilationUnit that) {
464 if (that.packge == sym) result = that;
465 else super.visitTopLevel(that);
466 }
467 public void visitClassDef(JCClassDecl that) {
468 if (that.sym == sym) result = that;
469 else super.visitClassDef(that);
470 }
471 public void visitMethodDef(JCMethodDecl that) {
472 if (that.sym == sym) result = that;
473 else super.visitMethodDef(that);
474 }
475 public void visitVarDef(JCVariableDecl that) {
476 if (that.sym == sym) result = that;
477 else super.visitVarDef(that);
478 }
479 }
480 DeclScanner s = new DeclScanner();
481 tree.accept(s);
482 return s.result;
483 }
485 public static Env<AttrContext> scopeFor(JCTree node, JCCompilationUnit unit) {
486 return scopeFor(pathFor(node, unit));
487 }
489 public static Env<AttrContext> scopeFor(List<JCTree> path) {
490 // TODO: not implemented yet
491 throw new UnsupportedOperationException("not implemented yet");
492 }
494 public static List<JCTree> pathFor(final JCTree node, final JCCompilationUnit unit) {
495 class Result extends Error {
496 static final long serialVersionUID = -5942088234594905625L;
497 List<JCTree> path;
498 Result(List<JCTree> path) {
499 this.path = path;
500 }
501 }
502 class PathFinder extends TreeScanner {
503 List<JCTree> path = List.nil();
504 public void scan(JCTree tree) {
505 if (tree != null) {
506 path = path.prepend(tree);
507 if (tree == node)
508 throw new Result(path);
509 super.scan(tree);
510 path = path.tail;
511 }
512 }
513 }
514 try {
515 new PathFinder().scan(unit);
516 } catch (Result result) {
517 return result.path;
518 }
519 return List.nil();
520 }
522 /** Return the statement referenced by a label.
523 * If the label refers to a loop or switch, return that switch
524 * otherwise return the labelled statement itself
525 */
526 public static JCTree referencedStatement(JCLabeledStatement tree) {
527 JCTree t = tree;
528 do t = ((JCLabeledStatement) t).body;
529 while (t.getTag() == JCTree.LABELLED);
530 switch (t.getTag()) {
531 case JCTree.DOLOOP: case JCTree.WHILELOOP: case JCTree.FORLOOP: case JCTree.FOREACHLOOP: case JCTree.SWITCH:
532 return t;
533 default:
534 return tree;
535 }
536 }
538 /** Skip parens and return the enclosed expression
539 */
540 public static JCExpression skipParens(JCExpression tree) {
541 while (tree.getTag() == JCTree.PARENS) {
542 tree = ((JCParens) tree).expr;
543 }
544 return tree;
545 }
547 /** Skip parens and return the enclosed expression
548 */
549 public static JCTree skipParens(JCTree tree) {
550 if (tree.getTag() == JCTree.PARENS)
551 return skipParens((JCParens)tree);
552 else
553 return tree;
554 }
556 /** Return the types of a list of trees.
557 */
558 public static List<Type> types(List<? extends JCTree> trees) {
559 ListBuffer<Type> ts = new ListBuffer<Type>();
560 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
561 ts.append(l.head.type);
562 return ts.toList();
563 }
565 /** If this tree is an identifier or a field or a parameterized type,
566 * return its name, otherwise return null.
567 */
568 public static Name name(JCTree tree) {
569 switch (tree.getTag()) {
570 case JCTree.IDENT:
571 return ((JCIdent) tree).name;
572 case JCTree.SELECT:
573 return ((JCFieldAccess) tree).name;
574 case JCTree.TYPEAPPLY:
575 return name(((JCTypeApply) tree).clazz);
576 default:
577 return null;
578 }
579 }
581 /** If this tree is a qualified identifier, its return fully qualified name,
582 * otherwise return null.
583 */
584 public static Name fullName(JCTree tree) {
585 tree = skipParens(tree);
586 switch (tree.getTag()) {
587 case JCTree.IDENT:
588 return ((JCIdent) tree).name;
589 case JCTree.SELECT:
590 Name sname = fullName(((JCFieldAccess) tree).selected);
591 return sname == null ? null : sname.append('.', name(tree));
592 default:
593 return null;
594 }
595 }
597 public static Symbol symbolFor(JCTree node) {
598 node = skipParens(node);
599 switch (node.getTag()) {
600 case JCTree.CLASSDEF:
601 return ((JCClassDecl) node).sym;
602 case JCTree.METHODDEF:
603 return ((JCMethodDecl) node).sym;
604 case JCTree.VARDEF:
605 return ((JCVariableDecl) node).sym;
606 default:
607 return null;
608 }
609 }
611 /** If this tree is an identifier or a field, return its symbol,
612 * otherwise return null.
613 */
614 public static Symbol symbol(JCTree tree) {
615 tree = skipParens(tree);
616 switch (tree.getTag()) {
617 case JCTree.IDENT:
618 return ((JCIdent) tree).sym;
619 case JCTree.SELECT:
620 return ((JCFieldAccess) tree).sym;
621 case JCTree.TYPEAPPLY:
622 return symbol(((JCTypeApply) tree).clazz);
623 default:
624 return null;
625 }
626 }
628 /** Return true if this is a nonstatic selection. */
629 public static boolean nonstaticSelect(JCTree tree) {
630 tree = skipParens(tree);
631 if (tree.getTag() != JCTree.SELECT) return false;
632 JCFieldAccess s = (JCFieldAccess) tree;
633 Symbol e = symbol(s.selected);
634 return e == null || (e.kind != Kinds.PCK && e.kind != Kinds.TYP);
635 }
637 /** If this tree is an identifier or a field, set its symbol, otherwise skip.
638 */
639 public static void setSymbol(JCTree tree, Symbol sym) {
640 tree = skipParens(tree);
641 switch (tree.getTag()) {
642 case JCTree.IDENT:
643 ((JCIdent) tree).sym = sym; break;
644 case JCTree.SELECT:
645 ((JCFieldAccess) tree).sym = sym; break;
646 default:
647 }
648 }
650 /** If this tree is a declaration or a block, return its flags field,
651 * otherwise return 0.
652 */
653 public static long flags(JCTree tree) {
654 switch (tree.getTag()) {
655 case JCTree.VARDEF:
656 return ((JCVariableDecl) tree).mods.flags;
657 case JCTree.METHODDEF:
658 return ((JCMethodDecl) tree).mods.flags;
659 case JCTree.CLASSDEF:
660 return ((JCClassDecl) tree).mods.flags;
661 case JCTree.BLOCK:
662 return ((JCBlock) tree).flags;
663 default:
664 return 0;
665 }
666 }
668 /** Return first (smallest) flag in `flags':
669 * pre: flags != 0
670 */
671 public static long firstFlag(long flags) {
672 int flag = 1;
673 while ((flag & StandardFlags) != 0 && (flag & flags) == 0)
674 flag = flag << 1;
675 return flag;
676 }
678 /** Return flags as a string, separated by " ".
679 */
680 public static String flagNames(long flags) {
681 return Flags.toString(flags & StandardFlags).trim();
682 }
684 /** Operator precedences values.
685 */
686 public static final int
687 notExpression = -1, // not an expression
688 noPrec = 0, // no enclosing expression
689 assignPrec = 1,
690 assignopPrec = 2,
691 condPrec = 3,
692 orPrec = 4,
693 andPrec = 5,
694 bitorPrec = 6,
695 bitxorPrec = 7,
696 bitandPrec = 8,
697 eqPrec = 9,
698 ordPrec = 10,
699 shiftPrec = 11,
700 addPrec = 12,
701 mulPrec = 13,
702 prefixPrec = 14,
703 postfixPrec = 15,
704 precCount = 16;
707 /** Map operators to their precedence levels.
708 */
709 public static int opPrec(int op) {
710 switch(op) {
711 case JCTree.POS:
712 case JCTree.NEG:
713 case JCTree.NOT:
714 case JCTree.COMPL:
715 case JCTree.PREINC:
716 case JCTree.PREDEC: return prefixPrec;
717 case JCTree.POSTINC:
718 case JCTree.POSTDEC:
719 case JCTree.NULLCHK: return postfixPrec;
720 case JCTree.ASSIGN: return assignPrec;
721 case JCTree.BITOR_ASG:
722 case JCTree.BITXOR_ASG:
723 case JCTree.BITAND_ASG:
724 case JCTree.SL_ASG:
725 case JCTree.SR_ASG:
726 case JCTree.USR_ASG:
727 case JCTree.PLUS_ASG:
728 case JCTree.MINUS_ASG:
729 case JCTree.MUL_ASG:
730 case JCTree.DIV_ASG:
731 case JCTree.MOD_ASG: return assignopPrec;
732 case JCTree.OR: return orPrec;
733 case JCTree.AND: return andPrec;
734 case JCTree.EQ:
735 case JCTree.NE: return eqPrec;
736 case JCTree.LT:
737 case JCTree.GT:
738 case JCTree.LE:
739 case JCTree.GE: return ordPrec;
740 case JCTree.BITOR: return bitorPrec;
741 case JCTree.BITXOR: return bitxorPrec;
742 case JCTree.BITAND: return bitandPrec;
743 case JCTree.SL:
744 case JCTree.SR:
745 case JCTree.USR: return shiftPrec;
746 case JCTree.PLUS:
747 case JCTree.MINUS: return addPrec;
748 case JCTree.MUL:
749 case JCTree.DIV:
750 case JCTree.MOD: return mulPrec;
751 case JCTree.TYPETEST: return ordPrec;
752 default: throw new AssertionError();
753 }
754 }
756 static Tree.Kind tagToKind(int tag) {
757 switch (tag) {
758 // Postfix expressions
759 case JCTree.POSTINC: // _ ++
760 return Tree.Kind.POSTFIX_INCREMENT;
761 case JCTree.POSTDEC: // _ --
762 return Tree.Kind.POSTFIX_DECREMENT;
764 // Unary operators
765 case JCTree.PREINC: // ++ _
766 return Tree.Kind.PREFIX_INCREMENT;
767 case JCTree.PREDEC: // -- _
768 return Tree.Kind.PREFIX_DECREMENT;
769 case JCTree.POS: // +
770 return Tree.Kind.UNARY_PLUS;
771 case JCTree.NEG: // -
772 return Tree.Kind.UNARY_MINUS;
773 case JCTree.COMPL: // ~
774 return Tree.Kind.BITWISE_COMPLEMENT;
775 case JCTree.NOT: // !
776 return Tree.Kind.LOGICAL_COMPLEMENT;
778 // Binary operators
780 // Multiplicative operators
781 case JCTree.MUL: // *
782 return Tree.Kind.MULTIPLY;
783 case JCTree.DIV: // /
784 return Tree.Kind.DIVIDE;
785 case JCTree.MOD: // %
786 return Tree.Kind.REMAINDER;
788 // Additive operators
789 case JCTree.PLUS: // +
790 return Tree.Kind.PLUS;
791 case JCTree.MINUS: // -
792 return Tree.Kind.MINUS;
794 // Shift operators
795 case JCTree.SL: // <<
796 return Tree.Kind.LEFT_SHIFT;
797 case JCTree.SR: // >>
798 return Tree.Kind.RIGHT_SHIFT;
799 case JCTree.USR: // >>>
800 return Tree.Kind.UNSIGNED_RIGHT_SHIFT;
802 // Relational operators
803 case JCTree.LT: // <
804 return Tree.Kind.LESS_THAN;
805 case JCTree.GT: // >
806 return Tree.Kind.GREATER_THAN;
807 case JCTree.LE: // <=
808 return Tree.Kind.LESS_THAN_EQUAL;
809 case JCTree.GE: // >=
810 return Tree.Kind.GREATER_THAN_EQUAL;
812 // Equality operators
813 case JCTree.EQ: // ==
814 return Tree.Kind.EQUAL_TO;
815 case JCTree.NE: // !=
816 return Tree.Kind.NOT_EQUAL_TO;
818 // Bitwise and logical operators
819 case JCTree.BITAND: // &
820 return Tree.Kind.AND;
821 case JCTree.BITXOR: // ^
822 return Tree.Kind.XOR;
823 case JCTree.BITOR: // |
824 return Tree.Kind.OR;
826 // Conditional operators
827 case JCTree.AND: // &&
828 return Tree.Kind.CONDITIONAL_AND;
829 case JCTree.OR: // ||
830 return Tree.Kind.CONDITIONAL_OR;
832 // Assignment operators
833 case JCTree.MUL_ASG: // *=
834 return Tree.Kind.MULTIPLY_ASSIGNMENT;
835 case JCTree.DIV_ASG: // /=
836 return Tree.Kind.DIVIDE_ASSIGNMENT;
837 case JCTree.MOD_ASG: // %=
838 return Tree.Kind.REMAINDER_ASSIGNMENT;
839 case JCTree.PLUS_ASG: // +=
840 return Tree.Kind.PLUS_ASSIGNMENT;
841 case JCTree.MINUS_ASG: // -=
842 return Tree.Kind.MINUS_ASSIGNMENT;
843 case JCTree.SL_ASG: // <<=
844 return Tree.Kind.LEFT_SHIFT_ASSIGNMENT;
845 case JCTree.SR_ASG: // >>=
846 return Tree.Kind.RIGHT_SHIFT_ASSIGNMENT;
847 case JCTree.USR_ASG: // >>>=
848 return Tree.Kind.UNSIGNED_RIGHT_SHIFT_ASSIGNMENT;
849 case JCTree.BITAND_ASG: // &=
850 return Tree.Kind.AND_ASSIGNMENT;
851 case JCTree.BITXOR_ASG: // ^=
852 return Tree.Kind.XOR_ASSIGNMENT;
853 case JCTree.BITOR_ASG: // |=
854 return Tree.Kind.OR_ASSIGNMENT;
856 // Null check (implementation detail), for example, __.getClass()
857 case JCTree.NULLCHK:
858 return Tree.Kind.OTHER;
860 default:
861 return null;
862 }
863 }
865 /**
866 * Returns the underlying type of the tree if it is annotated type,
867 * or the tree itself otherwise
868 */
869 public static JCExpression typeIn(JCExpression tree) {
870 switch (tree.getTag()) {
871 case JCTree.ANNOTATED_TYPE:
872 return ((JCAnnotatedType)tree).underlyingType;
873 case JCTree.IDENT: /* simple names */
874 case JCTree.TYPEIDENT: /* primitive name */
875 case JCTree.SELECT: /* qualified name */
876 case JCTree.TYPEARRAY: /* array types */
877 case JCTree.WILDCARD: /* wild cards */
878 case JCTree.TYPEPARAMETER: /* type parameters */
879 case JCTree.TYPEAPPLY: /* parameterized types */
880 return tree;
881 default:
882 throw new AssertionError("Unexpected type tree: " + tree);
883 }
884 }
885 }
