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src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@536ee9f126b1
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
Mon, 06 Dec 2010 11:51:02 +0000
- author
- mcimadamore
- date
- Mon, 06 Dec 2010 11:51:02 +0000
- changeset 775
- 536ee9f126b1
- parent 767
- 7e3e9f6d013f
- child 795
- 7b99f98b3035
- permissions
- -rw-r--r--
5088429: varargs overloading problem
Summary: compiler implementation for overload resolution w/ varargs method does not match JLS
Reviewed-by: jjg
1 /*
2 * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
29 import java.util.Set;
30 import javax.tools.JavaFileObject;
32 import com.sun.tools.javac.code.*;
33 import com.sun.tools.javac.jvm.*;
34 import com.sun.tools.javac.tree.*;
35 import com.sun.tools.javac.util.*;
36 import com.sun.tools.javac.util.List;
38 import com.sun.tools.javac.code.Type.*;
39 import com.sun.tools.javac.code.Symbol.*;
40 import com.sun.tools.javac.tree.JCTree.*;
42 import static com.sun.tools.javac.code.Flags.*;
43 import static com.sun.tools.javac.code.Kinds.*;
44 import static com.sun.tools.javac.code.TypeTags.*;
45 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
47 /** This is the second phase of Enter, in which classes are completed
48 * by entering their members into the class scope using
49 * MemberEnter.complete(). See Enter for an overview.
50 *
51 * <p><b>This is NOT part of any supported API.
52 * If you write code that depends on this, you do so at your own risk.
53 * This code and its internal interfaces are subject to change or
54 * deletion without notice.</b>
55 */
56 public class MemberEnter extends JCTree.Visitor implements Completer {
57 protected static final Context.Key<MemberEnter> memberEnterKey =
58 new Context.Key<MemberEnter>();
60 /** A switch to determine whether we check for package/class conflicts
61 */
62 final static boolean checkClash = true;
64 private final Names names;
65 private final Enter enter;
66 private final Log log;
67 private final Check chk;
68 private final Attr attr;
69 private final Symtab syms;
70 private final Scope.ScopeCounter scopeCounter;
71 private final TreeMaker make;
72 private final ClassReader reader;
73 private final Todo todo;
74 private final Annotate annotate;
75 private final Types types;
76 private final JCDiagnostic.Factory diags;
77 private final Target target;
79 private final boolean skipAnnotations;
81 public static MemberEnter instance(Context context) {
82 MemberEnter instance = context.get(memberEnterKey);
83 if (instance == null)
84 instance = new MemberEnter(context);
85 return instance;
86 }
88 protected MemberEnter(Context context) {
89 context.put(memberEnterKey, this);
90 names = Names.instance(context);
91 enter = Enter.instance(context);
92 log = Log.instance(context);
93 chk = Check.instance(context);
94 attr = Attr.instance(context);
95 syms = Symtab.instance(context);
96 scopeCounter = Scope.ScopeCounter.instance(context);
97 make = TreeMaker.instance(context);
98 reader = ClassReader.instance(context);
99 todo = Todo.instance(context);
100 annotate = Annotate.instance(context);
101 types = Types.instance(context);
102 diags = JCDiagnostic.Factory.instance(context);
103 target = Target.instance(context);
104 Options options = Options.instance(context);
105 skipAnnotations = options.isSet("skipAnnotations");
106 }
108 /** A queue for classes whose members still need to be entered into the
109 * symbol table.
110 */
111 ListBuffer<Env<AttrContext>> halfcompleted = new ListBuffer<Env<AttrContext>>();
113 /** Set to true only when the first of a set of classes is
114 * processed from the halfcompleted queue.
115 */
116 boolean isFirst = true;
118 /** A flag to disable completion from time to time during member
119 * enter, as we only need to look up types. This avoids
120 * unnecessarily deep recursion.
121 */
122 boolean completionEnabled = true;
124 /* ---------- Processing import clauses ----------------
125 */
127 /** Import all classes of a class or package on demand.
128 * @param pos Position to be used for error reporting.
129 * @param tsym The class or package the members of which are imported.
130 * @param toScope The (import) scope in which imported classes
131 * are entered.
132 */
133 private void importAll(int pos,
134 final TypeSymbol tsym,
135 Env<AttrContext> env) {
136 // Check that packages imported from exist (JLS ???).
137 if (tsym.kind == PCK && tsym.members().elems == null && !tsym.exists()) {
138 // If we can't find java.lang, exit immediately.
139 if (((PackageSymbol)tsym).fullname.equals(names.java_lang)) {
140 JCDiagnostic msg = diags.fragment("fatal.err.no.java.lang");
141 throw new FatalError(msg);
142 } else {
143 log.error(pos, "doesnt.exist", tsym);
144 }
145 }
146 env.toplevel.starImportScope.importAll(tsym.members());
147 }
149 /** Import all static members of a class or package on demand.
150 * @param pos Position to be used for error reporting.
151 * @param tsym The class or package the members of which are imported.
152 * @param toScope The (import) scope in which imported classes
153 * are entered.
154 */
155 private void importStaticAll(int pos,
156 final TypeSymbol tsym,
157 Env<AttrContext> env) {
158 final JavaFileObject sourcefile = env.toplevel.sourcefile;
159 final Scope toScope = env.toplevel.starImportScope;
160 final PackageSymbol packge = env.toplevel.packge;
161 final TypeSymbol origin = tsym;
163 // enter imported types immediately
164 new Object() {
165 Set<Symbol> processed = new HashSet<Symbol>();
166 void importFrom(TypeSymbol tsym) {
167 if (tsym == null || !processed.add(tsym))
168 return;
170 // also import inherited names
171 importFrom(types.supertype(tsym.type).tsym);
172 for (Type t : types.interfaces(tsym.type))
173 importFrom(t.tsym);
175 final Scope fromScope = tsym.members();
176 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
177 Symbol sym = e.sym;
178 if (sym.kind == TYP &&
179 (sym.flags() & STATIC) != 0 &&
180 staticImportAccessible(sym, packge) &&
181 sym.isMemberOf(origin, types) &&
182 !toScope.includes(sym))
183 toScope.enter(sym, fromScope, origin.members());
184 }
185 }
186 }.importFrom(tsym);
188 // enter non-types before annotations that might use them
189 annotate.earlier(new Annotate.Annotator() {
190 Set<Symbol> processed = new HashSet<Symbol>();
192 public String toString() {
193 return "import static " + tsym + ".*" + " in " + sourcefile;
194 }
195 void importFrom(TypeSymbol tsym) {
196 if (tsym == null || !processed.add(tsym))
197 return;
199 // also import inherited names
200 importFrom(types.supertype(tsym.type).tsym);
201 for (Type t : types.interfaces(tsym.type))
202 importFrom(t.tsym);
204 final Scope fromScope = tsym.members();
205 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
206 Symbol sym = e.sym;
207 if (sym.isStatic() && sym.kind != TYP &&
208 staticImportAccessible(sym, packge) &&
209 !toScope.includes(sym) &&
210 sym.isMemberOf(origin, types)) {
211 toScope.enter(sym, fromScope, origin.members());
212 }
213 }
214 }
215 public void enterAnnotation() {
216 importFrom(tsym);
217 }
218 });
219 }
221 // is the sym accessible everywhere in packge?
222 boolean staticImportAccessible(Symbol sym, PackageSymbol packge) {
223 int flags = (int)(sym.flags() & AccessFlags);
224 switch (flags) {
225 default:
226 case PUBLIC:
227 return true;
228 case PRIVATE:
229 return false;
230 case 0:
231 case PROTECTED:
232 return sym.packge() == packge;
233 }
234 }
236 /** Import statics types of a given name. Non-types are handled in Attr.
237 * @param pos Position to be used for error reporting.
238 * @param tsym The class from which the name is imported.
239 * @param name The (simple) name being imported.
240 * @param env The environment containing the named import
241 * scope to add to.
242 */
243 private void importNamedStatic(final DiagnosticPosition pos,
244 final TypeSymbol tsym,
245 final Name name,
246 final Env<AttrContext> env) {
247 if (tsym.kind != TYP) {
248 log.error(pos, "static.imp.only.classes.and.interfaces");
249 return;
250 }
252 final Scope toScope = env.toplevel.namedImportScope;
253 final PackageSymbol packge = env.toplevel.packge;
254 final TypeSymbol origin = tsym;
256 // enter imported types immediately
257 new Object() {
258 Set<Symbol> processed = new HashSet<Symbol>();
259 void importFrom(TypeSymbol tsym) {
260 if (tsym == null || !processed.add(tsym))
261 return;
263 // also import inherited names
264 importFrom(types.supertype(tsym.type).tsym);
265 for (Type t : types.interfaces(tsym.type))
266 importFrom(t.tsym);
268 for (Scope.Entry e = tsym.members().lookup(name);
269 e.scope != null;
270 e = e.next()) {
271 Symbol sym = e.sym;
272 if (sym.isStatic() &&
273 sym.kind == TYP &&
274 staticImportAccessible(sym, packge) &&
275 sym.isMemberOf(origin, types) &&
276 chk.checkUniqueStaticImport(pos, sym, toScope))
277 toScope.enter(sym, sym.owner.members(), origin.members());
278 }
279 }
280 }.importFrom(tsym);
282 // enter non-types before annotations that might use them
283 annotate.earlier(new Annotate.Annotator() {
284 Set<Symbol> processed = new HashSet<Symbol>();
285 boolean found = false;
287 public String toString() {
288 return "import static " + tsym + "." + name;
289 }
290 void importFrom(TypeSymbol tsym) {
291 if (tsym == null || !processed.add(tsym))
292 return;
294 // also import inherited names
295 importFrom(types.supertype(tsym.type).tsym);
296 for (Type t : types.interfaces(tsym.type))
297 importFrom(t.tsym);
299 for (Scope.Entry e = tsym.members().lookup(name);
300 e.scope != null;
301 e = e.next()) {
302 Symbol sym = e.sym;
303 if (sym.isStatic() &&
304 staticImportAccessible(sym, packge) &&
305 sym.isMemberOf(origin, types)) {
306 found = true;
307 if (sym.kind == MTH ||
308 sym.kind != TYP && chk.checkUniqueStaticImport(pos, sym, toScope))
309 toScope.enter(sym, sym.owner.members(), origin.members());
310 }
311 }
312 }
313 public void enterAnnotation() {
314 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
315 try {
316 importFrom(tsym);
317 if (!found) {
318 log.error(pos, "cant.resolve.location",
319 KindName.STATIC,
320 name, List.<Type>nil(), List.<Type>nil(),
321 Kinds.typeKindName(tsym.type),
322 tsym.type);
323 }
324 } finally {
325 log.useSource(prev);
326 }
327 }
328 });
329 }
330 /** Import given class.
331 * @param pos Position to be used for error reporting.
332 * @param tsym The class to be imported.
333 * @param env The environment containing the named import
334 * scope to add to.
335 */
336 private void importNamed(DiagnosticPosition pos, Symbol tsym, Env<AttrContext> env) {
337 if (tsym.kind == TYP &&
338 chk.checkUniqueImport(pos, tsym, env.toplevel.namedImportScope))
339 env.toplevel.namedImportScope.enter(tsym, tsym.owner.members());
340 }
342 /** Construct method type from method signature.
343 * @param typarams The method's type parameters.
344 * @param params The method's value parameters.
345 * @param res The method's result type,
346 * null if it is a constructor.
347 * @param thrown The method's thrown exceptions.
348 * @param env The method's (local) environment.
349 */
350 Type signature(List<JCTypeParameter> typarams,
351 List<JCVariableDecl> params,
352 JCTree res,
353 List<JCExpression> thrown,
354 Env<AttrContext> env) {
356 // Enter and attribute type parameters.
357 List<Type> tvars = enter.classEnter(typarams, env);
358 attr.attribTypeVariables(typarams, env);
360 // Enter and attribute value parameters.
361 ListBuffer<Type> argbuf = new ListBuffer<Type>();
362 for (List<JCVariableDecl> l = params; l.nonEmpty(); l = l.tail) {
363 memberEnter(l.head, env);
364 argbuf.append(l.head.vartype.type);
365 }
367 // Attribute result type, if one is given.
368 Type restype = res == null ? syms.voidType : attr.attribType(res, env);
370 // Attribute thrown exceptions.
371 ListBuffer<Type> thrownbuf = new ListBuffer<Type>();
372 for (List<JCExpression> l = thrown; l.nonEmpty(); l = l.tail) {
373 Type exc = attr.attribType(l.head, env);
374 if (exc.tag != TYPEVAR)
375 exc = chk.checkClassType(l.head.pos(), exc);
376 thrownbuf.append(exc);
377 }
378 Type mtype = new MethodType(argbuf.toList(),
379 restype,
380 thrownbuf.toList(),
381 syms.methodClass);
382 return tvars.isEmpty() ? mtype : new ForAll(tvars, mtype);
383 }
385 /* ********************************************************************
386 * Visitor methods for member enter
387 *********************************************************************/
389 /** Visitor argument: the current environment
390 */
391 protected Env<AttrContext> env;
393 /** Enter field and method definitions and process import
394 * clauses, catching any completion failure exceptions.
395 */
396 protected void memberEnter(JCTree tree, Env<AttrContext> env) {
397 Env<AttrContext> prevEnv = this.env;
398 try {
399 this.env = env;
400 tree.accept(this);
401 } catch (CompletionFailure ex) {
402 chk.completionError(tree.pos(), ex);
403 } finally {
404 this.env = prevEnv;
405 }
406 }
408 /** Enter members from a list of trees.
409 */
410 void memberEnter(List<? extends JCTree> trees, Env<AttrContext> env) {
411 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
412 memberEnter(l.head, env);
413 }
415 /** Enter members for a class.
416 */
417 void finishClass(JCClassDecl tree, Env<AttrContext> env) {
418 if ((tree.mods.flags & Flags.ENUM) != 0 &&
419 (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) {
420 addEnumMembers(tree, env);
421 }
422 memberEnter(tree.defs, env);
423 }
425 /** Add the implicit members for an enum type
426 * to the symbol table.
427 */
428 private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) {
429 JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass));
431 // public static T[] values() { return ???; }
432 JCMethodDecl values = make.
433 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
434 names.values,
435 valuesType,
436 List.<JCTypeParameter>nil(),
437 List.<JCVariableDecl>nil(),
438 List.<JCExpression>nil(), // thrown
439 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
440 null);
441 memberEnter(values, env);
443 // public static T valueOf(String name) { return ???; }
444 JCMethodDecl valueOf = make.
445 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
446 names.valueOf,
447 make.Type(tree.sym.type),
448 List.<JCTypeParameter>nil(),
449 List.of(make.VarDef(make.Modifiers(Flags.PARAMETER),
450 names.fromString("name"),
451 make.Type(syms.stringType), null)),
452 List.<JCExpression>nil(), // thrown
453 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
454 null);
455 memberEnter(valueOf, env);
457 // the remaining members are for bootstrapping only
458 if (!target.compilerBootstrap(tree.sym)) return;
460 // public final int ordinal() { return ???; }
461 JCMethodDecl ordinal = make.at(tree.pos).
462 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.FINAL),
463 names.ordinal,
464 make.Type(syms.intType),
465 List.<JCTypeParameter>nil(),
466 List.<JCVariableDecl>nil(),
467 List.<JCExpression>nil(),
468 null,
469 null);
470 memberEnter(ordinal, env);
472 // public final String name() { return ???; }
473 JCMethodDecl name = make.
474 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.FINAL),
475 names._name,
476 make.Type(syms.stringType),
477 List.<JCTypeParameter>nil(),
478 List.<JCVariableDecl>nil(),
479 List.<JCExpression>nil(),
480 null,
481 null);
482 memberEnter(name, env);
484 // public int compareTo(E other) { return ???; }
485 MethodSymbol compareTo = new
486 MethodSymbol(Flags.PUBLIC,
487 names.compareTo,
488 new MethodType(List.of(tree.sym.type),
489 syms.intType,
490 List.<Type>nil(),
491 syms.methodClass),
492 tree.sym);
493 memberEnter(make.MethodDef(compareTo, null), env);
494 }
496 public void visitTopLevel(JCCompilationUnit tree) {
497 if (tree.starImportScope.elems != null) {
498 // we must have already processed this toplevel
499 return;
500 }
502 // check that no class exists with same fully qualified name as
503 // toplevel package
504 if (checkClash && tree.pid != null) {
505 Symbol p = tree.packge;
506 while (p.owner != syms.rootPackage) {
507 p.owner.complete(); // enter all class members of p
508 if (syms.classes.get(p.getQualifiedName()) != null) {
509 log.error(tree.pos,
510 "pkg.clashes.with.class.of.same.name",
511 p);
512 }
513 p = p.owner;
514 }
515 }
517 // process package annotations
518 annotateLater(tree.packageAnnotations, env, tree.packge);
520 // Import-on-demand java.lang.
521 importAll(tree.pos, reader.enterPackage(names.java_lang), env);
523 // Process all import clauses.
524 memberEnter(tree.defs, env);
525 }
527 // process the non-static imports and the static imports of types.
528 public void visitImport(JCImport tree) {
529 JCTree imp = tree.qualid;
530 Name name = TreeInfo.name(imp);
531 TypeSymbol p;
533 // Create a local environment pointing to this tree to disable
534 // effects of other imports in Resolve.findGlobalType
535 Env<AttrContext> localEnv = env.dup(tree);
537 // Attribute qualifying package or class.
538 JCFieldAccess s = (JCFieldAccess) imp;
539 p = attr.
540 attribTree(s.selected,
541 localEnv,
542 tree.staticImport ? TYP : (TYP | PCK),
543 Type.noType).tsym;
544 if (name == names.asterisk) {
545 // Import on demand.
546 chk.checkCanonical(s.selected);
547 if (tree.staticImport)
548 importStaticAll(tree.pos, p, env);
549 else
550 importAll(tree.pos, p, env);
551 } else {
552 // Named type import.
553 if (tree.staticImport) {
554 importNamedStatic(tree.pos(), p, name, localEnv);
555 chk.checkCanonical(s.selected);
556 } else {
557 TypeSymbol c = attribImportType(imp, localEnv).tsym;
558 chk.checkCanonical(imp);
559 importNamed(tree.pos(), c, env);
560 }
561 }
562 }
564 public void visitMethodDef(JCMethodDecl tree) {
565 Scope enclScope = enter.enterScope(env);
566 MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
567 m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
568 tree.sym = m;
569 Env<AttrContext> localEnv = methodEnv(tree, env);
571 // Compute the method type
572 m.type = signature(tree.typarams, tree.params,
573 tree.restype, tree.thrown,
574 localEnv);
576 // Set m.params
577 ListBuffer<VarSymbol> params = new ListBuffer<VarSymbol>();
578 JCVariableDecl lastParam = null;
579 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
580 JCVariableDecl param = lastParam = l.head;
581 assert param.sym != null;
582 params.append(param.sym);
583 }
584 m.params = params.toList();
586 // mark the method varargs, if necessary
587 if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
588 m.flags_field |= Flags.VARARGS;
590 localEnv.info.scope.leave();
591 if (chk.checkUnique(tree.pos(), m, enclScope)) {
592 enclScope.enter(m);
593 }
594 annotateLater(tree.mods.annotations, localEnv, m);
595 if (tree.defaultValue != null)
596 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
597 }
599 /** Create a fresh environment for method bodies.
600 * @param tree The method definition.
601 * @param env The environment current outside of the method definition.
602 */
603 Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
604 Env<AttrContext> localEnv =
605 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
606 localEnv.enclMethod = tree;
607 localEnv.info.scope.owner = tree.sym;
608 if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++;
609 return localEnv;
610 }
612 public void visitVarDef(JCVariableDecl tree) {
613 Env<AttrContext> localEnv = env;
614 if ((tree.mods.flags & STATIC) != 0 ||
615 (env.info.scope.owner.flags() & INTERFACE) != 0) {
616 localEnv = env.dup(tree, env.info.dup());
617 localEnv.info.staticLevel++;
618 }
619 attr.attribType(tree.vartype, localEnv);
620 Scope enclScope = enter.enterScope(env);
621 VarSymbol v =
622 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
623 v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
624 tree.sym = v;
625 if (tree.init != null) {
626 v.flags_field |= HASINIT;
627 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
628 Env<AttrContext> initEnv = getInitEnv(tree, env);
629 initEnv.info.enclVar = v;
630 v.setLazyConstValue(initEnv(tree, initEnv), log, attr, tree.init);
631 }
632 }
633 if (chk.checkUnique(tree.pos(), v, enclScope)) {
634 chk.checkTransparentVar(tree.pos(), v, enclScope);
635 enclScope.enter(v);
636 }
637 annotateLater(tree.mods.annotations, localEnv, v);
638 v.pos = tree.pos;
639 }
641 /** Create a fresh environment for a variable's initializer.
642 * If the variable is a field, the owner of the environment's scope
643 * is be the variable itself, otherwise the owner is the method
644 * enclosing the variable definition.
645 *
646 * @param tree The variable definition.
647 * @param env The environment current outside of the variable definition.
648 */
649 Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
650 Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
651 if (tree.sym.owner.kind == TYP) {
652 localEnv.info.scope = new Scope.DelegatedScope(env.info.scope);
653 localEnv.info.scope.owner = tree.sym;
654 }
655 if ((tree.mods.flags & STATIC) != 0 ||
656 (env.enclClass.sym.flags() & INTERFACE) != 0)
657 localEnv.info.staticLevel++;
658 return localEnv;
659 }
661 /** Default member enter visitor method: do nothing
662 */
663 public void visitTree(JCTree tree) {
664 }
666 public void visitErroneous(JCErroneous tree) {
667 if (tree.errs != null)
668 memberEnter(tree.errs, env);
669 }
671 public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
672 Env<AttrContext> mEnv = methodEnv(tree, env);
673 mEnv.info.lint = mEnv.info.lint.augment(tree.sym.attributes_field, tree.sym.flags());
674 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
675 mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
676 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
677 mEnv.info.scope.enterIfAbsent(l.head.sym);
678 return mEnv;
679 }
681 public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
682 Env<AttrContext> iEnv = initEnv(tree, env);
683 return iEnv;
684 }
686 /* ********************************************************************
687 * Type completion
688 *********************************************************************/
690 Type attribImportType(JCTree tree, Env<AttrContext> env) {
691 assert completionEnabled;
692 try {
693 // To prevent deep recursion, suppress completion of some
694 // types.
695 completionEnabled = false;
696 return attr.attribType(tree, env);
697 } finally {
698 completionEnabled = true;
699 }
700 }
702 /* ********************************************************************
703 * Annotation processing
704 *********************************************************************/
706 /** Queue annotations for later processing. */
707 void annotateLater(final List<JCAnnotation> annotations,
708 final Env<AttrContext> localEnv,
709 final Symbol s) {
710 if (annotations.isEmpty()) return;
711 if (s.kind != PCK) s.attributes_field = null; // mark it incomplete for now
712 annotate.later(new Annotate.Annotator() {
713 public String toString() {
714 return "annotate " + annotations + " onto " + s + " in " + s.owner;
715 }
716 public void enterAnnotation() {
717 assert s.kind == PCK || s.attributes_field == null;
718 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
719 try {
720 if (s.attributes_field != null &&
721 s.attributes_field.nonEmpty() &&
722 annotations.nonEmpty())
723 log.error(annotations.head.pos,
724 "already.annotated",
725 kindName(s), s);
726 enterAnnotations(annotations, localEnv, s);
727 } finally {
728 log.useSource(prev);
729 }
730 }
731 });
732 }
734 /**
735 * Check if a list of annotations contains a reference to
736 * java.lang.Deprecated.
737 **/
738 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
739 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
740 JCAnnotation a = al.head;
741 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
742 return true;
743 }
744 return false;
745 }
748 /** Enter a set of annotations. */
749 private void enterAnnotations(List<JCAnnotation> annotations,
750 Env<AttrContext> env,
751 Symbol s) {
752 ListBuffer<Attribute.Compound> buf =
753 new ListBuffer<Attribute.Compound>();
754 Set<TypeSymbol> annotated = new HashSet<TypeSymbol>();
755 if (!skipAnnotations)
756 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
757 JCAnnotation a = al.head;
758 Attribute.Compound c = annotate.enterAnnotation(a,
759 syms.annotationType,
760 env);
761 if (c == null) continue;
762 buf.append(c);
763 // Note: @Deprecated has no effect on local variables and parameters
764 if (!c.type.isErroneous()
765 && s.owner.kind != MTH
766 && types.isSameType(c.type, syms.deprecatedType))
767 s.flags_field |= Flags.DEPRECATED;
768 // Internally to java.dyn, a @PolymorphicSignature annotation
769 // acts like a classfile attribute.
770 if (!c.type.isErroneous() &&
771 types.isSameType(c.type, syms.polymorphicSignatureType)) {
772 if (!target.hasMethodHandles()) {
773 // Somebody is compiling JDK7 source code to a JDK6 target.
774 // Make it a strict warning, since it is unlikely but important.
775 log.strictWarning(env.tree.pos(),
776 "wrong.target.for.polymorphic.signature.definition",
777 target.name);
778 }
779 // Pull the flag through for better diagnostics, even on a bad target.
780 s.flags_field |= Flags.POLYMORPHIC_SIGNATURE;
781 }
782 if (!annotated.add(a.type.tsym))
783 log.error(a.pos, "duplicate.annotation");
784 }
785 s.attributes_field = buf.toList();
786 }
788 /** Queue processing of an attribute default value. */
789 void annotateDefaultValueLater(final JCExpression defaultValue,
790 final Env<AttrContext> localEnv,
791 final MethodSymbol m) {
792 annotate.later(new Annotate.Annotator() {
793 public String toString() {
794 return "annotate " + m.owner + "." +
795 m + " default " + defaultValue;
796 }
797 public void enterAnnotation() {
798 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
799 try {
800 enterDefaultValue(defaultValue, localEnv, m);
801 } finally {
802 log.useSource(prev);
803 }
804 }
805 });
806 }
808 /** Enter a default value for an attribute method. */
809 private void enterDefaultValue(final JCExpression defaultValue,
810 final Env<AttrContext> localEnv,
811 final MethodSymbol m) {
812 m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
813 defaultValue,
814 localEnv);
815 }
817 /* ********************************************************************
818 * Source completer
819 *********************************************************************/
821 /** Complete entering a class.
822 * @param sym The symbol of the class to be completed.
823 */
824 public void complete(Symbol sym) throws CompletionFailure {
825 // Suppress some (recursive) MemberEnter invocations
826 if (!completionEnabled) {
827 // Re-install same completer for next time around and return.
828 assert (sym.flags() & Flags.COMPOUND) == 0;
829 sym.completer = this;
830 return;
831 }
833 ClassSymbol c = (ClassSymbol)sym;
834 ClassType ct = (ClassType)c.type;
835 Env<AttrContext> env = enter.typeEnvs.get(c);
836 JCClassDecl tree = (JCClassDecl)env.tree;
837 boolean wasFirst = isFirst;
838 isFirst = false;
840 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
841 try {
842 // Save class environment for later member enter (2) processing.
843 halfcompleted.append(env);
845 // Mark class as not yet attributed.
846 c.flags_field |= UNATTRIBUTED;
848 // If this is a toplevel-class, make sure any preceding import
849 // clauses have been seen.
850 if (c.owner.kind == PCK) {
851 memberEnter(env.toplevel, env.enclosing(JCTree.TOPLEVEL));
852 todo.append(env);
853 }
855 if (c.owner.kind == TYP)
856 c.owner.complete();
858 // create an environment for evaluating the base clauses
859 Env<AttrContext> baseEnv = baseEnv(tree, env);
861 // Determine supertype.
862 Type supertype =
863 (tree.extending != null)
864 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
865 : ((tree.mods.flags & Flags.ENUM) != 0 && !target.compilerBootstrap(c))
866 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
867 true, false, false)
868 : (c.fullname == names.java_lang_Object)
869 ? Type.noType
870 : syms.objectType;
871 ct.supertype_field = supertype;
873 // Determine interfaces.
874 ListBuffer<Type> interfaces = new ListBuffer<Type>();
875 Set<Type> interfaceSet = new HashSet<Type>();
876 List<JCExpression> interfaceTrees = tree.implementing;
877 if ((tree.mods.flags & Flags.ENUM) != 0 && target.compilerBootstrap(c)) {
878 // add interface Comparable<T>
879 interfaceTrees =
880 interfaceTrees.prepend(make.Type(new ClassType(syms.comparableType.getEnclosingType(),
881 List.of(c.type),
882 syms.comparableType.tsym)));
883 // add interface Serializable
884 interfaceTrees =
885 interfaceTrees.prepend(make.Type(syms.serializableType));
886 }
887 for (JCExpression iface : interfaceTrees) {
888 Type i = attr.attribBase(iface, baseEnv, false, true, true);
889 if (i.tag == CLASS) {
890 interfaces.append(i);
891 chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
892 }
893 }
894 if ((c.flags_field & ANNOTATION) != 0)
895 ct.interfaces_field = List.of(syms.annotationType);
896 else
897 ct.interfaces_field = interfaces.toList();
899 if (c.fullname == names.java_lang_Object) {
900 if (tree.extending != null) {
901 chk.checkNonCyclic(tree.extending.pos(),
902 supertype);
903 ct.supertype_field = Type.noType;
904 }
905 else if (tree.implementing.nonEmpty()) {
906 chk.checkNonCyclic(tree.implementing.head.pos(),
907 ct.interfaces_field.head);
908 ct.interfaces_field = List.nil();
909 }
910 }
912 // Annotations.
913 // In general, we cannot fully process annotations yet, but we
914 // can attribute the annotation types and then check to see if the
915 // @Deprecated annotation is present.
916 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
917 if (hasDeprecatedAnnotation(tree.mods.annotations))
918 c.flags_field |= DEPRECATED;
919 annotateLater(tree.mods.annotations, baseEnv, c);
920 // class type parameters use baseEnv but everything uses env
921 for (JCTypeParameter tp : tree.typarams)
922 tp.accept(new TypeAnnotate(baseEnv));
923 tree.accept(new TypeAnnotate(env));
925 chk.checkNonCyclicDecl(tree);
927 attr.attribTypeVariables(tree.typarams, baseEnv);
929 // Add default constructor if needed.
930 if ((c.flags() & INTERFACE) == 0 &&
931 !TreeInfo.hasConstructors(tree.defs)) {
932 List<Type> argtypes = List.nil();
933 List<Type> typarams = List.nil();
934 List<Type> thrown = List.nil();
935 long ctorFlags = 0;
936 boolean based = false;
937 if (c.name.isEmpty()) {
938 JCNewClass nc = (JCNewClass)env.next.tree;
939 if (nc.constructor != null) {
940 Type superConstrType = types.memberType(c.type,
941 nc.constructor);
942 argtypes = superConstrType.getParameterTypes();
943 typarams = superConstrType.getTypeArguments();
944 ctorFlags = nc.constructor.flags() & VARARGS;
945 if (nc.encl != null) {
946 argtypes = argtypes.prepend(nc.encl.type);
947 based = true;
948 }
949 thrown = superConstrType.getThrownTypes();
950 }
951 }
952 JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
953 typarams, argtypes, thrown,
954 ctorFlags, based);
955 tree.defs = tree.defs.prepend(constrDef);
956 }
958 // If this is a class, enter symbols for this and super into
959 // current scope.
960 if ((c.flags_field & INTERFACE) == 0) {
961 VarSymbol thisSym =
962 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
963 thisSym.pos = Position.FIRSTPOS;
964 env.info.scope.enter(thisSym);
965 if (ct.supertype_field.tag == CLASS) {
966 VarSymbol superSym =
967 new VarSymbol(FINAL | HASINIT, names._super,
968 ct.supertype_field, c);
969 superSym.pos = Position.FIRSTPOS;
970 env.info.scope.enter(superSym);
971 }
972 }
974 // check that no package exists with same fully qualified name,
975 // but admit classes in the unnamed package which have the same
976 // name as a top-level package.
977 if (checkClash &&
978 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
979 reader.packageExists(c.fullname))
980 {
981 log.error(tree.pos, "clash.with.pkg.of.same.name", c);
982 }
984 } catch (CompletionFailure ex) {
985 chk.completionError(tree.pos(), ex);
986 } finally {
987 log.useSource(prev);
988 }
990 // Enter all member fields and methods of a set of half completed
991 // classes in a second phase.
992 if (wasFirst) {
993 try {
994 while (halfcompleted.nonEmpty()) {
995 finish(halfcompleted.next());
996 }
997 } finally {
998 isFirst = true;
999 }
1001 // commit pending annotations
1002 annotate.flush();
1003 }
1004 }
1006 // A sub-phase that "compiles" annotations in annotated types.
1007 private class TypeAnnotate extends TreeScanner {
1008 private Env<AttrContext> env;
1009 public TypeAnnotate(Env<AttrContext> env) { this.env = env; }
1011 private void enterTypeAnnotations(List<JCTypeAnnotation> annotations) {
1012 Set<TypeSymbol> annotated = new HashSet<TypeSymbol>();
1013 if (!skipAnnotations)
1014 for (List<JCTypeAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
1015 JCTypeAnnotation a = al.head;
1016 Attribute.Compound c = annotate.enterAnnotation(a,
1017 syms.annotationType,
1018 env);
1019 if (c == null) continue;
1020 Attribute.TypeCompound tc = new Attribute.TypeCompound(c.type, c.values, a.annotation_position);
1021 a.attribute_field = tc;
1022 // Note: @Deprecated has no effect on local variables and parameters
1023 if (!annotated.add(a.type.tsym))
1024 log.error(a.pos, "duplicate.annotation");
1025 }
1026 }
1028 // each class (including enclosed inner classes) should be visited
1029 // separately through MemberEnter.complete(Symbol)
1030 // this flag is used to prevent from visiting inner classes.
1031 private boolean isEnclosingClass = false;
1032 @Override
1033 public void visitClassDef(final JCClassDecl tree) {
1034 if (isEnclosingClass)
1035 return;
1036 isEnclosingClass = true;
1037 scan(tree.mods);
1038 // type parameter need to be visited with a separate env
1039 // scan(tree.typarams);
1040 scan(tree.extending);
1041 scan(tree.implementing);
1042 scan(tree.defs);
1043 }
1045 private void annotate(final JCTree tree, final List<JCTypeAnnotation> annotations) {
1046 annotate.later(new Annotate.Annotator() {
1047 public String toString() {
1048 return "annotate " + annotations + " onto " + tree;
1049 }
1050 public void enterAnnotation() {
1051 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1052 try {
1053 enterTypeAnnotations(annotations);
1054 } finally {
1055 log.useSource(prev);
1056 }
1057 }
1058 });
1059 }
1061 @Override
1062 public void visitAnnotatedType(final JCAnnotatedType tree) {
1063 annotate(tree, tree.annotations);
1064 super.visitAnnotatedType(tree);
1065 }
1066 @Override
1067 public void visitTypeParameter(final JCTypeParameter tree) {
1068 annotate(tree, tree.annotations);
1069 super.visitTypeParameter(tree);
1070 }
1071 @Override
1072 public void visitNewArray(final JCNewArray tree) {
1073 annotate(tree, tree.annotations);
1074 for (List<JCTypeAnnotation> dimAnnos : tree.dimAnnotations)
1075 annotate(tree, dimAnnos);
1076 super.visitNewArray(tree);
1077 }
1078 @Override
1079 public void visitMethodDef(JCMethodDecl tree) {
1080 annotate(tree, tree.receiverAnnotations);
1081 super.visitMethodDef(tree);
1082 }
1083 }
1086 private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
1087 Scope baseScope = new Scope.ClassScope(tree.sym, scopeCounter);
1088 //import already entered local classes into base scope
1089 for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
1090 if (e.sym.isLocal()) {
1091 baseScope.enter(e.sym);
1092 }
1093 }
1094 //import current type-parameters into base scope
1095 if (tree.typarams != null)
1096 for (List<JCTypeParameter> typarams = tree.typarams;
1097 typarams.nonEmpty();
1098 typarams = typarams.tail)
1099 baseScope.enter(typarams.head.type.tsym);
1100 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
1101 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
1102 localEnv.baseClause = true;
1103 localEnv.outer = outer;
1104 localEnv.info.isSelfCall = false;
1105 return localEnv;
1106 }
1108 /** Enter member fields and methods of a class
1109 * @param env the environment current for the class block.
1110 */
1111 private void finish(Env<AttrContext> env) {
1112 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1113 try {
1114 JCClassDecl tree = (JCClassDecl)env.tree;
1115 finishClass(tree, env);
1116 } finally {
1117 log.useSource(prev);
1118 }
1119 }
1121 /** Generate a base clause for an enum type.
1122 * @param pos The position for trees and diagnostics, if any
1123 * @param c The class symbol of the enum
1124 */
1125 private JCExpression enumBase(int pos, ClassSymbol c) {
1126 JCExpression result = make.at(pos).
1127 TypeApply(make.QualIdent(syms.enumSym),
1128 List.<JCExpression>of(make.Type(c.type)));
1129 return result;
1130 }
1132 /* ***************************************************************************
1133 * tree building
1134 ****************************************************************************/
1136 /** Generate default constructor for given class. For classes different
1137 * from java.lang.Object, this is:
1138 *
1139 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1140 * super(x_0, ..., x_n)
1141 * }
1142 *
1143 * or, if based == true:
1144 *
1145 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1146 * x_0.super(x_1, ..., x_n)
1147 * }
1148 *
1149 * @param make The tree factory.
1150 * @param c The class owning the default constructor.
1151 * @param argtypes The parameter types of the constructor.
1152 * @param thrown The thrown exceptions of the constructor.
1153 * @param based Is first parameter a this$n?
1154 */
1155 JCTree DefaultConstructor(TreeMaker make,
1156 ClassSymbol c,
1157 List<Type> typarams,
1158 List<Type> argtypes,
1159 List<Type> thrown,
1160 long flags,
1161 boolean based) {
1162 List<JCVariableDecl> params = make.Params(argtypes, syms.noSymbol);
1163 List<JCStatement> stats = List.nil();
1164 if (c.type != syms.objectType)
1165 stats = stats.prepend(SuperCall(make, typarams, params, based));
1166 if ((c.flags() & ENUM) != 0 &&
1167 (types.supertype(c.type).tsym == syms.enumSym ||
1168 target.compilerBootstrap(c))) {
1169 // constructors of true enums are private
1170 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
1171 } else
1172 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
1173 if (c.name.isEmpty()) flags |= ANONCONSTR;
1174 JCTree result = make.MethodDef(
1175 make.Modifiers(flags),
1176 names.init,
1177 null,
1178 make.TypeParams(typarams),
1179 params,
1180 make.Types(thrown),
1181 make.Block(0, stats),
1182 null);
1183 return result;
1184 }
1186 /** Generate call to superclass constructor. This is:
1187 *
1188 * super(id_0, ..., id_n)
1189 *
1190 * or, if based == true
1191 *
1192 * id_0.super(id_1,...,id_n)
1193 *
1194 * where id_0, ..., id_n are the names of the given parameters.
1195 *
1196 * @param make The tree factory
1197 * @param params The parameters that need to be passed to super
1198 * @param typarams The type parameters that need to be passed to super
1199 * @param based Is first parameter a this$n?
1200 */
1201 JCExpressionStatement SuperCall(TreeMaker make,
1202 List<Type> typarams,
1203 List<JCVariableDecl> params,
1204 boolean based) {
1205 JCExpression meth;
1206 if (based) {
1207 meth = make.Select(make.Ident(params.head), names._super);
1208 params = params.tail;
1209 } else {
1210 meth = make.Ident(names._super);
1211 }
1212 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
1213 return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
1214 }
1215 }
