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src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@37031963493e
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
Fri, 12 Jul 2013 13:11:12 -0700
- author
- jjg
- date
- Fri, 12 Jul 2013 13:11:12 -0700
- changeset 1895
- 37031963493e
- parent 1850
- 6debfa63a4a1
- child 1896
- 44e27378f523
- permissions
- -rw-r--r--
8020278: NPE in javadoc
Reviewed-by: mcimadamore, vromero
1 /*
2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.HashMap;
29 import java.util.HashSet;
30 import java.util.LinkedHashMap;
31 import java.util.Map;
32 import java.util.Set;
34 import javax.tools.JavaFileObject;
36 import com.sun.tools.javac.code.*;
37 import com.sun.tools.javac.jvm.*;
38 import com.sun.tools.javac.tree.*;
39 import com.sun.tools.javac.util.*;
41 import com.sun.tools.javac.code.Type.*;
42 import com.sun.tools.javac.code.Symbol.*;
43 import com.sun.tools.javac.tree.JCTree.*;
45 import static com.sun.tools.javac.code.Flags.*;
46 import static com.sun.tools.javac.code.Flags.ANNOTATION;
47 import static com.sun.tools.javac.code.Kinds.*;
48 import static com.sun.tools.javac.code.TypeTag.CLASS;
49 import static com.sun.tools.javac.code.TypeTag.ERROR;
50 import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
51 import static com.sun.tools.javac.tree.JCTree.Tag.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
53 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
55 /** This is the second phase of Enter, in which classes are completed
56 * by entering their members into the class scope using
57 * MemberEnter.complete(). See Enter for an overview.
58 *
59 * <p><b>This is NOT part of any supported API.
60 * If you write code that depends on this, you do so at your own risk.
61 * This code and its internal interfaces are subject to change or
62 * deletion without notice.</b>
63 */
64 public class MemberEnter extends JCTree.Visitor implements Completer {
65 protected static final Context.Key<MemberEnter> memberEnterKey =
66 new Context.Key<MemberEnter>();
68 /** A switch to determine whether we check for package/class conflicts
69 */
70 final static boolean checkClash = true;
72 private final Names names;
73 private final Enter enter;
74 private final Log log;
75 private final Check chk;
76 private final Attr attr;
77 private final Symtab syms;
78 private final TreeMaker make;
79 private final ClassReader reader;
80 private final Todo todo;
81 private final Annotate annotate;
82 private final Types types;
83 private final JCDiagnostic.Factory diags;
84 private final Source source;
85 private final Target target;
86 private final DeferredLintHandler deferredLintHandler;
88 public static MemberEnter instance(Context context) {
89 MemberEnter instance = context.get(memberEnterKey);
90 if (instance == null)
91 instance = new MemberEnter(context);
92 return instance;
93 }
95 protected MemberEnter(Context context) {
96 context.put(memberEnterKey, this);
97 names = Names.instance(context);
98 enter = Enter.instance(context);
99 log = Log.instance(context);
100 chk = Check.instance(context);
101 attr = Attr.instance(context);
102 syms = Symtab.instance(context);
103 make = TreeMaker.instance(context);
104 reader = ClassReader.instance(context);
105 todo = Todo.instance(context);
106 annotate = Annotate.instance(context);
107 types = Types.instance(context);
108 diags = JCDiagnostic.Factory.instance(context);
109 source = Source.instance(context);
110 target = Target.instance(context);
111 deferredLintHandler = DeferredLintHandler.instance(context);
112 allowTypeAnnos = source.allowTypeAnnotations();
113 }
115 /** Switch: support type annotations.
116 */
117 boolean allowTypeAnnos;
119 /** A queue for classes whose members still need to be entered into the
120 * symbol table.
121 */
122 ListBuffer<Env<AttrContext>> halfcompleted = new ListBuffer<Env<AttrContext>>();
124 /** Set to true only when the first of a set of classes is
125 * processed from the half completed queue.
126 */
127 boolean isFirst = true;
129 /** A flag to disable completion from time to time during member
130 * enter, as we only need to look up types. This avoids
131 * unnecessarily deep recursion.
132 */
133 boolean completionEnabled = true;
135 /* ---------- Processing import clauses ----------------
136 */
138 /** Import all classes of a class or package on demand.
139 * @param pos Position to be used for error reporting.
140 * @param tsym The class or package the members of which are imported.
141 * @param env The env in which the imported classes will be entered.
142 */
143 private void importAll(int pos,
144 final TypeSymbol tsym,
145 Env<AttrContext> env) {
146 // Check that packages imported from exist (JLS ???).
147 if (tsym.kind == PCK && tsym.members().elems == null && !tsym.exists()) {
148 // If we can't find java.lang, exit immediately.
149 if (((PackageSymbol)tsym).fullname.equals(names.java_lang)) {
150 JCDiagnostic msg = diags.fragment("fatal.err.no.java.lang");
151 throw new FatalError(msg);
152 } else {
153 log.error(DiagnosticFlag.RESOLVE_ERROR, pos, "doesnt.exist", tsym);
154 }
155 }
156 env.toplevel.starImportScope.importAll(tsym.members());
157 }
159 /** Import all static members of a class or package on demand.
160 * @param pos Position to be used for error reporting.
161 * @param tsym The class or package the members of which are imported.
162 * @param env The env in which the imported classes will be entered.
163 */
164 private void importStaticAll(int pos,
165 final TypeSymbol tsym,
166 Env<AttrContext> env) {
167 final JavaFileObject sourcefile = env.toplevel.sourcefile;
168 final Scope toScope = env.toplevel.starImportScope;
169 final PackageSymbol packge = env.toplevel.packge;
170 final TypeSymbol origin = tsym;
172 // enter imported types immediately
173 new Object() {
174 Set<Symbol> processed = new HashSet<Symbol>();
175 void importFrom(TypeSymbol tsym) {
176 if (tsym == null || !processed.add(tsym))
177 return;
179 // also import inherited names
180 importFrom(types.supertype(tsym.type).tsym);
181 for (Type t : types.interfaces(tsym.type))
182 importFrom(t.tsym);
184 final Scope fromScope = tsym.members();
185 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
186 Symbol sym = e.sym;
187 if (sym.kind == TYP &&
188 (sym.flags() & STATIC) != 0 &&
189 staticImportAccessible(sym, packge) &&
190 sym.isMemberOf(origin, types) &&
191 !toScope.includes(sym))
192 toScope.enter(sym, fromScope, origin.members());
193 }
194 }
195 }.importFrom(tsym);
197 // enter non-types before annotations that might use them
198 annotate.earlier(new Annotate.Annotator() {
199 Set<Symbol> processed = new HashSet<Symbol>();
201 public String toString() {
202 return "import static " + tsym + ".*" + " in " + sourcefile;
203 }
204 void importFrom(TypeSymbol tsym) {
205 if (tsym == null || !processed.add(tsym))
206 return;
208 // also import inherited names
209 importFrom(types.supertype(tsym.type).tsym);
210 for (Type t : types.interfaces(tsym.type))
211 importFrom(t.tsym);
213 final Scope fromScope = tsym.members();
214 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
215 Symbol sym = e.sym;
216 if (sym.isStatic() && sym.kind != TYP &&
217 staticImportAccessible(sym, packge) &&
218 !toScope.includes(sym) &&
219 sym.isMemberOf(origin, types)) {
220 toScope.enter(sym, fromScope, origin.members());
221 }
222 }
223 }
224 public void enterAnnotation() {
225 importFrom(tsym);
226 }
227 });
228 }
230 // is the sym accessible everywhere in packge?
231 boolean staticImportAccessible(Symbol sym, PackageSymbol packge) {
232 int flags = (int)(sym.flags() & AccessFlags);
233 switch (flags) {
234 default:
235 case PUBLIC:
236 return true;
237 case PRIVATE:
238 return false;
239 case 0:
240 case PROTECTED:
241 return sym.packge() == packge;
242 }
243 }
245 /** Import statics types of a given name. Non-types are handled in Attr.
246 * @param pos Position to be used for error reporting.
247 * @param tsym The class from which the name is imported.
248 * @param name The (simple) name being imported.
249 * @param env The environment containing the named import
250 * scope to add to.
251 */
252 private void importNamedStatic(final DiagnosticPosition pos,
253 final TypeSymbol tsym,
254 final Name name,
255 final Env<AttrContext> env) {
256 if (tsym.kind != TYP) {
257 log.error(DiagnosticFlag.RECOVERABLE, pos, "static.imp.only.classes.and.interfaces");
258 return;
259 }
261 final Scope toScope = env.toplevel.namedImportScope;
262 final PackageSymbol packge = env.toplevel.packge;
263 final TypeSymbol origin = tsym;
265 // enter imported types immediately
266 new Object() {
267 Set<Symbol> processed = new HashSet<Symbol>();
268 void importFrom(TypeSymbol tsym) {
269 if (tsym == null || !processed.add(tsym))
270 return;
272 // also import inherited names
273 importFrom(types.supertype(tsym.type).tsym);
274 for (Type t : types.interfaces(tsym.type))
275 importFrom(t.tsym);
277 for (Scope.Entry e = tsym.members().lookup(name);
278 e.scope != null;
279 e = e.next()) {
280 Symbol sym = e.sym;
281 if (sym.isStatic() &&
282 sym.kind == TYP &&
283 staticImportAccessible(sym, packge) &&
284 sym.isMemberOf(origin, types) &&
285 chk.checkUniqueStaticImport(pos, sym, toScope))
286 toScope.enter(sym, sym.owner.members(), origin.members());
287 }
288 }
289 }.importFrom(tsym);
291 // enter non-types before annotations that might use them
292 annotate.earlier(new Annotate.Annotator() {
293 Set<Symbol> processed = new HashSet<Symbol>();
294 boolean found = false;
296 public String toString() {
297 return "import static " + tsym + "." + name;
298 }
299 void importFrom(TypeSymbol tsym) {
300 if (tsym == null || !processed.add(tsym))
301 return;
303 // also import inherited names
304 importFrom(types.supertype(tsym.type).tsym);
305 for (Type t : types.interfaces(tsym.type))
306 importFrom(t.tsym);
308 for (Scope.Entry e = tsym.members().lookup(name);
309 e.scope != null;
310 e = e.next()) {
311 Symbol sym = e.sym;
312 if (sym.isStatic() &&
313 staticImportAccessible(sym, packge) &&
314 sym.isMemberOf(origin, types)) {
315 found = true;
316 if (sym.kind == MTH ||
317 sym.kind != TYP && chk.checkUniqueStaticImport(pos, sym, toScope))
318 toScope.enter(sym, sym.owner.members(), origin.members());
319 }
320 }
321 }
322 public void enterAnnotation() {
323 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
324 try {
325 importFrom(tsym);
326 if (!found) {
327 log.error(pos, "cant.resolve.location",
328 KindName.STATIC,
329 name, List.<Type>nil(), List.<Type>nil(),
330 Kinds.typeKindName(tsym.type),
331 tsym.type);
332 }
333 } finally {
334 log.useSource(prev);
335 }
336 }
337 });
338 }
339 /** Import given class.
340 * @param pos Position to be used for error reporting.
341 * @param tsym The class to be imported.
342 * @param env The environment containing the named import
343 * scope to add to.
344 */
345 private void importNamed(DiagnosticPosition pos, Symbol tsym, Env<AttrContext> env) {
346 if (tsym.kind == TYP &&
347 chk.checkUniqueImport(pos, tsym, env.toplevel.namedImportScope))
348 env.toplevel.namedImportScope.enter(tsym, tsym.owner.members());
349 }
351 /** Construct method type from method signature.
352 * @param typarams The method's type parameters.
353 * @param params The method's value parameters.
354 * @param res The method's result type,
355 * null if it is a constructor.
356 * @param recvparam The method's receiver parameter,
357 * null if none given; TODO: or already set here?
358 * @param thrown The method's thrown exceptions.
359 * @param env The method's (local) environment.
360 */
361 Type signature(List<JCTypeParameter> typarams,
362 List<JCVariableDecl> params,
363 JCTree res,
364 JCVariableDecl recvparam,
365 List<JCExpression> thrown,
366 Env<AttrContext> env) {
368 // Enter and attribute type parameters.
369 List<Type> tvars = enter.classEnter(typarams, env);
370 attr.attribTypeVariables(typarams, env);
372 // Enter and attribute value parameters.
373 ListBuffer<Type> argbuf = new ListBuffer<Type>();
374 for (List<JCVariableDecl> l = params; l.nonEmpty(); l = l.tail) {
375 memberEnter(l.head, env);
376 argbuf.append(l.head.vartype.type);
377 }
379 // Attribute result type, if one is given.
380 Type restype = res == null ? syms.voidType : attr.attribType(res, env);
382 // Attribute receiver type, if one is given.
383 Type recvtype;
384 if (recvparam!=null) {
385 memberEnter(recvparam, env);
386 recvtype = recvparam.vartype.type;
387 } else {
388 recvtype = null;
389 }
391 // Attribute thrown exceptions.
392 ListBuffer<Type> thrownbuf = new ListBuffer<Type>();
393 for (List<JCExpression> l = thrown; l.nonEmpty(); l = l.tail) {
394 Type exc = attr.attribType(l.head, env);
395 if (!exc.hasTag(TYPEVAR))
396 exc = chk.checkClassType(l.head.pos(), exc);
397 thrownbuf.append(exc);
398 }
399 MethodType mtype = new MethodType(argbuf.toList(),
400 restype,
401 thrownbuf.toList(),
402 syms.methodClass);
403 mtype.recvtype = recvtype;
405 return tvars.isEmpty() ? mtype : new ForAll(tvars, mtype);
406 }
408 /* ********************************************************************
409 * Visitor methods for member enter
410 *********************************************************************/
412 /** Visitor argument: the current environment
413 */
414 protected Env<AttrContext> env;
416 /** Enter field and method definitions and process import
417 * clauses, catching any completion failure exceptions.
418 */
419 protected void memberEnter(JCTree tree, Env<AttrContext> env) {
420 Env<AttrContext> prevEnv = this.env;
421 try {
422 this.env = env;
423 tree.accept(this);
424 } catch (CompletionFailure ex) {
425 chk.completionError(tree.pos(), ex);
426 } finally {
427 this.env = prevEnv;
428 }
429 }
431 /** Enter members from a list of trees.
432 */
433 void memberEnter(List<? extends JCTree> trees, Env<AttrContext> env) {
434 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
435 memberEnter(l.head, env);
436 }
438 /** Enter members for a class.
439 */
440 void finishClass(JCClassDecl tree, Env<AttrContext> env) {
441 if ((tree.mods.flags & Flags.ENUM) != 0 &&
442 (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) {
443 addEnumMembers(tree, env);
444 }
445 memberEnter(tree.defs, env);
446 }
448 /** Add the implicit members for an enum type
449 * to the symbol table.
450 */
451 private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) {
452 JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass));
454 // public static T[] values() { return ???; }
455 JCMethodDecl values = make.
456 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
457 names.values,
458 valuesType,
459 List.<JCTypeParameter>nil(),
460 List.<JCVariableDecl>nil(),
461 List.<JCExpression>nil(), // thrown
462 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
463 null);
464 memberEnter(values, env);
466 // public static T valueOf(String name) { return ???; }
467 JCMethodDecl valueOf = make.
468 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
469 names.valueOf,
470 make.Type(tree.sym.type),
471 List.<JCTypeParameter>nil(),
472 List.of(make.VarDef(make.Modifiers(Flags.PARAMETER |
473 Flags.MANDATED),
474 names.fromString("name"),
475 make.Type(syms.stringType), null)),
476 List.<JCExpression>nil(), // thrown
477 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
478 null);
479 memberEnter(valueOf, env);
480 }
482 public void visitTopLevel(JCCompilationUnit tree) {
483 if (tree.starImportScope.elems != null) {
484 // we must have already processed this toplevel
485 return;
486 }
488 // check that no class exists with same fully qualified name as
489 // toplevel package
490 if (checkClash && tree.pid != null) {
491 Symbol p = tree.packge;
492 while (p.owner != syms.rootPackage) {
493 p.owner.complete(); // enter all class members of p
494 if (syms.classes.get(p.getQualifiedName()) != null) {
495 log.error(tree.pos,
496 "pkg.clashes.with.class.of.same.name",
497 p);
498 }
499 p = p.owner;
500 }
501 }
503 // process package annotations
504 annotateLater(tree.packageAnnotations, env, tree.packge);
506 // Import-on-demand java.lang.
507 importAll(tree.pos, reader.enterPackage(names.java_lang), env);
509 // Process all import clauses.
510 memberEnter(tree.defs, env);
511 }
513 // process the non-static imports and the static imports of types.
514 public void visitImport(JCImport tree) {
515 JCFieldAccess imp = (JCFieldAccess)tree.qualid;
516 Name name = TreeInfo.name(imp);
518 // Create a local environment pointing to this tree to disable
519 // effects of other imports in Resolve.findGlobalType
520 Env<AttrContext> localEnv = env.dup(tree);
522 TypeSymbol p = attr.attribImportQualifier(tree, localEnv).tsym;
523 if (name == names.asterisk) {
524 // Import on demand.
525 chk.checkCanonical(imp.selected);
526 if (tree.staticImport)
527 importStaticAll(tree.pos, p, env);
528 else
529 importAll(tree.pos, p, env);
530 } else {
531 // Named type import.
532 if (tree.staticImport) {
533 importNamedStatic(tree.pos(), p, name, localEnv);
534 chk.checkCanonical(imp.selected);
535 } else {
536 TypeSymbol c = attribImportType(imp, localEnv).tsym;
537 chk.checkCanonical(imp);
538 importNamed(tree.pos(), c, env);
539 }
540 }
541 }
543 public void visitMethodDef(JCMethodDecl tree) {
544 Scope enclScope = enter.enterScope(env);
545 MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
546 m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
547 tree.sym = m;
549 //if this is a default method, add the DEFAULT flag to the enclosing interface
550 if ((tree.mods.flags & DEFAULT) != 0) {
551 m.enclClass().flags_field |= DEFAULT;
552 }
554 Env<AttrContext> localEnv = methodEnv(tree, env);
556 DeferredLintHandler prevLintHandler =
557 chk.setDeferredLintHandler(deferredLintHandler.setPos(tree.pos()));
558 try {
559 // Compute the method type
560 m.type = signature(tree.typarams, tree.params,
561 tree.restype, tree.recvparam,
562 tree.thrown,
563 localEnv);
564 } finally {
565 chk.setDeferredLintHandler(prevLintHandler);
566 }
568 if (types.isSignaturePolymorphic(m)) {
569 m.flags_field |= SIGNATURE_POLYMORPHIC;
570 }
572 // Set m.params
573 ListBuffer<VarSymbol> params = new ListBuffer<VarSymbol>();
574 JCVariableDecl lastParam = null;
575 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
576 JCVariableDecl param = lastParam = l.head;
577 params.append(Assert.checkNonNull(param.sym));
578 }
579 m.params = params.toList();
581 // mark the method varargs, if necessary
582 if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
583 m.flags_field |= Flags.VARARGS;
585 localEnv.info.scope.leave();
586 if (chk.checkUnique(tree.pos(), m, enclScope)) {
587 enclScope.enter(m);
588 }
589 annotateLater(tree.mods.annotations, localEnv, m);
590 // Visit the signature of the method. Note that
591 // TypeAnnotate doesn't descend into the body.
592 typeAnnotate(tree, localEnv, m);
594 if (tree.defaultValue != null)
595 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
596 }
598 /** Create a fresh environment for method bodies.
599 * @param tree The method definition.
600 * @param env The environment current outside of the method definition.
601 */
602 Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
603 Env<AttrContext> localEnv =
604 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
605 localEnv.enclMethod = tree;
606 localEnv.info.scope.owner = tree.sym;
607 if (tree.sym.type != null) {
608 //when this is called in the enter stage, there's no type to be set
609 localEnv.info.returnResult = attr.new ResultInfo(VAL, tree.sym.type.getReturnType());
610 }
611 if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++;
612 return localEnv;
613 }
615 public void visitVarDef(JCVariableDecl tree) {
616 Env<AttrContext> localEnv = env;
617 if ((tree.mods.flags & STATIC) != 0 ||
618 (env.info.scope.owner.flags() & INTERFACE) != 0) {
619 localEnv = env.dup(tree, env.info.dup());
620 localEnv.info.staticLevel++;
621 }
622 DeferredLintHandler prevLintHandler =
623 chk.setDeferredLintHandler(deferredLintHandler.setPos(tree.pos()));
624 try {
625 if (TreeInfo.isEnumInit(tree)) {
626 attr.attribIdentAsEnumType(localEnv, (JCIdent)tree.vartype);
627 } else {
628 // Make sure type annotations are processed.
629 // But we don't have a symbol to attach them to yet - use null.
630 typeAnnotate(tree.vartype, env, null);
631 attr.attribType(tree.vartype, localEnv);
632 if (tree.nameexpr != null) {
633 attr.attribExpr(tree.nameexpr, localEnv);
634 MethodSymbol m = localEnv.enclMethod.sym;
635 if (m.isConstructor()) {
636 Type outertype = m.owner.owner.type;
637 if (outertype.hasTag(TypeTag.CLASS)) {
638 checkType(tree.vartype, outertype, "incorrect.constructor.receiver.type");
639 checkType(tree.nameexpr, outertype, "incorrect.constructor.receiver.name");
640 } else {
641 log.error(tree, "receiver.parameter.not.applicable.constructor.toplevel.class");
642 }
643 } else {
644 checkType(tree.vartype, m.owner.type, "incorrect.receiver.type");
645 checkType(tree.nameexpr, m.owner.type, "incorrect.receiver.name");
646 }
647 }
648 }
649 } finally {
650 chk.setDeferredLintHandler(prevLintHandler);
651 }
653 if ((tree.mods.flags & VARARGS) != 0) {
654 //if we are entering a varargs parameter, we need to replace its type
655 //(a plain array type) with the more precise VarargsType --- we need
656 //to do it this way because varargs is represented in the tree as a modifier
657 //on the parameter declaration, and not as a distinct type of array node.
658 ArrayType atype = (ArrayType)tree.vartype.type.unannotatedType();
659 tree.vartype.type = atype.makeVarargs();
660 }
661 Scope enclScope = enter.enterScope(env);
662 VarSymbol v =
663 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
664 v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
665 tree.sym = v;
666 if (tree.init != null) {
667 v.flags_field |= HASINIT;
668 if ((v.flags_field & FINAL) != 0 &&
669 !tree.init.hasTag(NEWCLASS) &&
670 !tree.init.hasTag(LAMBDA)) {
671 Env<AttrContext> initEnv = getInitEnv(tree, env);
672 initEnv.info.enclVar = v;
673 v.setLazyConstValue(initEnv(tree, initEnv), attr, tree.init);
674 }
675 }
676 if (chk.checkUnique(tree.pos(), v, enclScope)) {
677 chk.checkTransparentVar(tree.pos(), v, enclScope);
678 enclScope.enter(v);
679 }
680 annotateLater(tree.mods.annotations, localEnv, v);
681 typeAnnotate(tree.vartype, env, v);
682 annotate.flush();
683 v.pos = tree.pos;
684 }
685 // where
686 void checkType(JCTree tree, Type type, String diag) {
687 if (!tree.type.isErroneous() && !types.isSameType(tree.type, type)) {
688 log.error(tree, diag, type, tree.type);
689 }
690 }
692 /** Create a fresh environment for a variable's initializer.
693 * If the variable is a field, the owner of the environment's scope
694 * is be the variable itself, otherwise the owner is the method
695 * enclosing the variable definition.
696 *
697 * @param tree The variable definition.
698 * @param env The environment current outside of the variable definition.
699 */
700 Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
701 Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
702 if (tree.sym.owner.kind == TYP) {
703 localEnv.info.scope = env.info.scope.dupUnshared();
704 localEnv.info.scope.owner = tree.sym;
705 }
706 if ((tree.mods.flags & STATIC) != 0 ||
707 ((env.enclClass.sym.flags() & INTERFACE) != 0 && env.enclMethod == null))
708 localEnv.info.staticLevel++;
709 return localEnv;
710 }
712 /** Default member enter visitor method: do nothing
713 */
714 public void visitTree(JCTree tree) {
715 }
717 public void visitErroneous(JCErroneous tree) {
718 if (tree.errs != null)
719 memberEnter(tree.errs, env);
720 }
722 public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
723 Env<AttrContext> mEnv = methodEnv(tree, env);
724 mEnv.info.lint = mEnv.info.lint.augment(tree.sym);
725 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
726 mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
727 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
728 mEnv.info.scope.enterIfAbsent(l.head.sym);
729 return mEnv;
730 }
732 public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
733 Env<AttrContext> iEnv = initEnv(tree, env);
734 return iEnv;
735 }
737 /* ********************************************************************
738 * Type completion
739 *********************************************************************/
741 Type attribImportType(JCTree tree, Env<AttrContext> env) {
742 Assert.check(completionEnabled);
743 try {
744 // To prevent deep recursion, suppress completion of some
745 // types.
746 completionEnabled = false;
747 return attr.attribType(tree, env);
748 } finally {
749 completionEnabled = true;
750 }
751 }
753 /* ********************************************************************
754 * Annotation processing
755 *********************************************************************/
757 /** Queue annotations for later processing. */
758 void annotateLater(final List<JCAnnotation> annotations,
759 final Env<AttrContext> localEnv,
760 final Symbol s) {
761 if (annotations.isEmpty()) {
762 return;
763 }
764 if (s.kind != PCK) {
765 s.resetAnnotations(); // mark Annotations as incomplete for now
766 }
767 annotate.normal(new Annotate.Annotator() {
768 @Override
769 public String toString() {
770 return "annotate " + annotations + " onto " + s + " in " + s.owner;
771 }
773 @Override
774 public void enterAnnotation() {
775 Assert.check(s.kind == PCK || s.annotationsPendingCompletion());
776 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
777 try {
778 if (s.hasAnnotations() &&
779 annotations.nonEmpty())
780 log.error(annotations.head.pos,
781 "already.annotated",
782 kindName(s), s);
783 actualEnterAnnotations(annotations, localEnv, s);
784 } finally {
785 log.useSource(prev);
786 }
787 }
788 });
789 }
791 /**
792 * Check if a list of annotations contains a reference to
793 * java.lang.Deprecated.
794 **/
795 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
796 for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
797 JCAnnotation a = al.head;
798 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
799 return true;
800 }
801 return false;
802 }
804 /** Enter a set of annotations. */
805 private void actualEnterAnnotations(List<JCAnnotation> annotations,
806 Env<AttrContext> env,
807 Symbol s) {
808 Map<TypeSymbol, ListBuffer<Attribute.Compound>> annotated =
809 new LinkedHashMap<TypeSymbol, ListBuffer<Attribute.Compound>>();
810 Map<Attribute.Compound, DiagnosticPosition> pos =
811 new HashMap<Attribute.Compound, DiagnosticPosition>();
813 for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
814 JCAnnotation a = al.head;
815 Attribute.Compound c = annotate.enterAnnotation(a,
816 syms.annotationType,
817 env);
818 if (c == null) {
819 continue;
820 }
822 if (annotated.containsKey(a.type.tsym)) {
823 if (source.allowRepeatedAnnotations()) {
824 ListBuffer<Attribute.Compound> l = annotated.get(a.type.tsym);
825 l = l.append(c);
826 annotated.put(a.type.tsym, l);
827 pos.put(c, a.pos());
828 } else {
829 log.error(a.pos(), "duplicate.annotation");
830 }
831 } else {
832 annotated.put(a.type.tsym, ListBuffer.of(c));
833 pos.put(c, a.pos());
834 }
836 // Note: @Deprecated has no effect on local variables and parameters
837 if (!c.type.isErroneous()
838 && s.owner.kind != MTH
839 && types.isSameType(c.type, syms.deprecatedType)) {
840 s.flags_field |= Flags.DEPRECATED;
841 }
842 }
844 s.setDeclarationAttributesWithCompletion(
845 annotate.new AnnotateRepeatedContext<Attribute.Compound>(env, annotated, pos, log, false));
846 }
848 /** Queue processing of an attribute default value. */
849 void annotateDefaultValueLater(final JCExpression defaultValue,
850 final Env<AttrContext> localEnv,
851 final MethodSymbol m) {
852 annotate.normal(new Annotate.Annotator() {
853 @Override
854 public String toString() {
855 return "annotate " + m.owner + "." +
856 m + " default " + defaultValue;
857 }
859 @Override
860 public void enterAnnotation() {
861 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
862 try {
863 enterDefaultValue(defaultValue, localEnv, m);
864 } finally {
865 log.useSource(prev);
866 }
867 }
868 });
869 }
871 /** Enter a default value for an attribute method. */
872 private void enterDefaultValue(final JCExpression defaultValue,
873 final Env<AttrContext> localEnv,
874 final MethodSymbol m) {
875 m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
876 defaultValue,
877 localEnv);
878 }
880 /* ********************************************************************
881 * Source completer
882 *********************************************************************/
884 /** Complete entering a class.
885 * @param sym The symbol of the class to be completed.
886 */
887 public void complete(Symbol sym) throws CompletionFailure {
888 // Suppress some (recursive) MemberEnter invocations
889 if (!completionEnabled) {
890 // Re-install same completer for next time around and return.
891 Assert.check((sym.flags() & Flags.COMPOUND) == 0);
892 sym.completer = this;
893 return;
894 }
896 ClassSymbol c = (ClassSymbol)sym;
897 ClassType ct = (ClassType)c.type;
898 Env<AttrContext> env = enter.typeEnvs.get(c);
899 JCClassDecl tree = (JCClassDecl)env.tree;
900 boolean wasFirst = isFirst;
901 isFirst = false;
903 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
904 try {
905 // Save class environment for later member enter (2) processing.
906 halfcompleted.append(env);
908 // Mark class as not yet attributed.
909 c.flags_field |= UNATTRIBUTED;
911 // If this is a toplevel-class, make sure any preceding import
912 // clauses have been seen.
913 if (c.owner.kind == PCK) {
914 memberEnter(env.toplevel, env.enclosing(TOPLEVEL));
915 todo.append(env);
916 }
918 if (c.owner.kind == TYP)
919 c.owner.complete();
921 // create an environment for evaluating the base clauses
922 Env<AttrContext> baseEnv = baseEnv(tree, env);
924 if (tree.extending != null)
925 typeAnnotate(tree.extending, baseEnv, sym);
926 for (JCExpression impl : tree.implementing)
927 typeAnnotate(impl, baseEnv, sym);
928 annotate.flush();
930 // Determine supertype.
931 Type supertype =
932 (tree.extending != null)
933 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
934 : ((tree.mods.flags & Flags.ENUM) != 0)
935 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
936 true, false, false)
937 : (c.fullname == names.java_lang_Object)
938 ? Type.noType
939 : syms.objectType;
940 ct.supertype_field = modelMissingTypes(supertype, tree.extending, false);
942 // Determine interfaces.
943 ListBuffer<Type> interfaces = new ListBuffer<Type>();
944 ListBuffer<Type> all_interfaces = null; // lazy init
945 Set<Type> interfaceSet = new HashSet<Type>();
946 List<JCExpression> interfaceTrees = tree.implementing;
947 for (JCExpression iface : interfaceTrees) {
948 Type i = attr.attribBase(iface, baseEnv, false, true, true);
949 if (i.hasTag(CLASS)) {
950 interfaces.append(i);
951 if (all_interfaces != null) all_interfaces.append(i);
952 chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
953 } else {
954 if (all_interfaces == null)
955 all_interfaces = new ListBuffer<Type>().appendList(interfaces);
956 all_interfaces.append(modelMissingTypes(i, iface, true));
957 }
958 }
959 if ((c.flags_field & ANNOTATION) != 0) {
960 ct.interfaces_field = List.of(syms.annotationType);
961 ct.all_interfaces_field = ct.interfaces_field;
962 } else {
963 ct.interfaces_field = interfaces.toList();
964 ct.all_interfaces_field = (all_interfaces == null)
965 ? ct.interfaces_field : all_interfaces.toList();
966 }
968 if (c.fullname == names.java_lang_Object) {
969 if (tree.extending != null) {
970 chk.checkNonCyclic(tree.extending.pos(),
971 supertype);
972 ct.supertype_field = Type.noType;
973 }
974 else if (tree.implementing.nonEmpty()) {
975 chk.checkNonCyclic(tree.implementing.head.pos(),
976 ct.interfaces_field.head);
977 ct.interfaces_field = List.nil();
978 }
979 }
981 // Annotations.
982 // In general, we cannot fully process annotations yet, but we
983 // can attribute the annotation types and then check to see if the
984 // @Deprecated annotation is present.
985 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
986 if (hasDeprecatedAnnotation(tree.mods.annotations))
987 c.flags_field |= DEPRECATED;
988 annotateLater(tree.mods.annotations, baseEnv, c);
989 // class type parameters use baseEnv but everything uses env
991 chk.checkNonCyclicDecl(tree);
993 attr.attribTypeVariables(tree.typarams, baseEnv);
994 // Do this here, where we have the symbol.
995 for (JCTypeParameter tp : tree.typarams)
996 typeAnnotate(tp, baseEnv, sym);
997 annotate.flush();
999 // Add default constructor if needed.
1000 if ((c.flags() & INTERFACE) == 0 &&
1001 !TreeInfo.hasConstructors(tree.defs)) {
1002 List<Type> argtypes = List.nil();
1003 List<Type> typarams = List.nil();
1004 List<Type> thrown = List.nil();
1005 long ctorFlags = 0;
1006 boolean based = false;
1007 boolean addConstructor = true;
1008 JCNewClass nc = null;
1009 if (c.name.isEmpty()) {
1010 nc = (JCNewClass)env.next.tree;
1011 if (nc.constructor != null) {
1012 addConstructor = nc.constructor.kind != ERR;
1013 Type superConstrType = types.memberType(c.type,
1014 nc.constructor);
1015 argtypes = superConstrType.getParameterTypes();
1016 typarams = superConstrType.getTypeArguments();
1017 ctorFlags = nc.constructor.flags() & VARARGS;
1018 if (nc.encl != null) {
1019 argtypes = argtypes.prepend(nc.encl.type);
1020 based = true;
1021 }
1022 thrown = superConstrType.getThrownTypes();
1023 }
1024 }
1025 if (addConstructor) {
1026 MethodSymbol basedConstructor = nc != null ?
1027 (MethodSymbol)nc.constructor : null;
1028 JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
1029 basedConstructor,
1030 typarams, argtypes, thrown,
1031 ctorFlags, based);
1032 tree.defs = tree.defs.prepend(constrDef);
1033 }
1034 }
1036 // enter symbols for 'this' into current scope.
1037 VarSymbol thisSym =
1038 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
1039 thisSym.pos = Position.FIRSTPOS;
1040 env.info.scope.enter(thisSym);
1041 // if this is a class, enter symbol for 'super' into current scope.
1042 if ((c.flags_field & INTERFACE) == 0 &&
1043 ct.supertype_field.hasTag(CLASS)) {
1044 VarSymbol superSym =
1045 new VarSymbol(FINAL | HASINIT, names._super,
1046 ct.supertype_field, c);
1047 superSym.pos = Position.FIRSTPOS;
1048 env.info.scope.enter(superSym);
1049 }
1051 // check that no package exists with same fully qualified name,
1052 // but admit classes in the unnamed package which have the same
1053 // name as a top-level package.
1054 if (checkClash &&
1055 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
1056 reader.packageExists(c.fullname)) {
1057 log.error(tree.pos, "clash.with.pkg.of.same.name", Kinds.kindName(sym), c);
1058 }
1059 if (c.owner.kind == PCK && (c.flags_field & PUBLIC) == 0 &&
1060 !env.toplevel.sourcefile.isNameCompatible(c.name.toString(),JavaFileObject.Kind.SOURCE)) {
1061 c.flags_field |= AUXILIARY;
1062 }
1063 } catch (CompletionFailure ex) {
1064 chk.completionError(tree.pos(), ex);
1065 } finally {
1066 log.useSource(prev);
1067 }
1069 // Enter all member fields and methods of a set of half completed
1070 // classes in a second phase.
1071 if (wasFirst) {
1072 try {
1073 while (halfcompleted.nonEmpty()) {
1074 finish(halfcompleted.next());
1075 }
1076 } finally {
1077 isFirst = true;
1078 }
1079 }
1080 if (allowTypeAnnos) {
1081 TypeAnnotations.organizeTypeAnnotationsSignatures(syms, names, log, tree, annotate);
1082 }
1083 }
1085 /*
1086 * If the symbol is non-null, attach the type annotation to it.
1087 */
1088 private void actualEnterTypeAnnotations(final List<JCAnnotation> annotations,
1089 final Env<AttrContext> env,
1090 final Symbol s) {
1091 Map<TypeSymbol, ListBuffer<Attribute.TypeCompound>> annotated =
1092 new LinkedHashMap<TypeSymbol, ListBuffer<Attribute.TypeCompound>>();
1093 Map<Attribute.TypeCompound, DiagnosticPosition> pos =
1094 new HashMap<Attribute.TypeCompound, DiagnosticPosition>();
1096 for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) {
1097 JCAnnotation a = al.head;
1098 Attribute.TypeCompound tc = annotate.enterTypeAnnotation(a,
1099 syms.annotationType,
1100 env);
1101 if (tc == null) {
1102 continue;
1103 }
1105 if (annotated.containsKey(a.type.tsym)) {
1106 if (source.allowRepeatedAnnotations()) {
1107 ListBuffer<Attribute.TypeCompound> l = annotated.get(a.type.tsym);
1108 l = l.append(tc);
1109 annotated.put(a.type.tsym, l);
1110 pos.put(tc, a.pos());
1111 } else {
1112 log.error(a.pos(), "duplicate.annotation");
1113 }
1114 } else {
1115 annotated.put(a.type.tsym, ListBuffer.of(tc));
1116 pos.put(tc, a.pos());
1117 }
1118 }
1120 if (s != null) {
1121 s.appendTypeAttributesWithCompletion(
1122 annotate.new AnnotateRepeatedContext<Attribute.TypeCompound>(env, annotated, pos, log, true));
1123 }
1124 }
1126 public void typeAnnotate(final JCTree tree, final Env<AttrContext> env, final Symbol sym) {
1127 if (allowTypeAnnos) {
1128 tree.accept(new TypeAnnotate(env, sym));
1129 }
1130 }
1132 /**
1133 * We need to use a TreeScanner, because it is not enough to visit the top-level
1134 * annotations. We also need to visit type arguments, etc.
1135 */
1136 private class TypeAnnotate extends TreeScanner {
1137 private Env<AttrContext> env;
1138 private Symbol sym;
1140 public TypeAnnotate(final Env<AttrContext> env, final Symbol sym) {
1141 this.env = env;
1142 this.sym = sym;
1143 }
1145 void annotateTypeLater(final List<JCAnnotation> annotations) {
1146 if (annotations.isEmpty()) {
1147 return;
1148 }
1150 annotate.normal(new Annotate.Annotator() {
1151 @Override
1152 public String toString() {
1153 return "type annotate " + annotations + " onto " + sym + " in " + sym.owner;
1154 }
1155 @Override
1156 public void enterAnnotation() {
1157 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1158 try {
1159 actualEnterTypeAnnotations(annotations, env, sym);
1160 } finally {
1161 log.useSource(prev);
1162 }
1163 }
1164 });
1165 }
1167 @Override
1168 public void visitAnnotatedType(final JCAnnotatedType tree) {
1169 annotateTypeLater(tree.annotations);
1170 super.visitAnnotatedType(tree);
1171 }
1173 @Override
1174 public void visitTypeParameter(final JCTypeParameter tree) {
1175 annotateTypeLater(tree.annotations);
1176 super.visitTypeParameter(tree);
1177 }
1179 @Override
1180 public void visitNewArray(final JCNewArray tree) {
1181 annotateTypeLater(tree.annotations);
1182 for (List<JCAnnotation> dimAnnos : tree.dimAnnotations)
1183 annotateTypeLater(dimAnnos);
1184 super.visitNewArray(tree);
1185 }
1187 @Override
1188 public void visitMethodDef(final JCMethodDecl tree) {
1189 scan(tree.mods);
1190 scan(tree.restype);
1191 scan(tree.typarams);
1192 scan(tree.recvparam);
1193 scan(tree.params);
1194 scan(tree.thrown);
1195 scan(tree.defaultValue);
1196 // Do not annotate the body, just the signature.
1197 // scan(tree.body);
1198 }
1200 @Override
1201 public void visitVarDef(final JCVariableDecl tree) {
1202 if (sym != null && sym.kind == Kinds.VAR) {
1203 // Don't visit a parameter once when the sym is the method
1204 // and once when the sym is the parameter.
1205 scan(tree.mods);
1206 scan(tree.vartype);
1207 }
1208 scan(tree.init);
1209 }
1211 @Override
1212 public void visitClassDef(JCClassDecl tree) {
1213 // We can only hit a classdef if it is declared within
1214 // a method. Ignore it - the class will be visited
1215 // separately later.
1216 }
1218 @Override
1219 public void visitNewClass(JCNewClass tree) {
1220 if (tree.def == null) {
1221 // For an anonymous class instantiation the class
1222 // will be visited separately.
1223 super.visitNewClass(tree);
1224 }
1225 }
1226 }
1229 private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
1230 Scope baseScope = new Scope(tree.sym);
1231 //import already entered local classes into base scope
1232 for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
1233 if (e.sym.isLocal()) {
1234 baseScope.enter(e.sym);
1235 }
1236 }
1237 //import current type-parameters into base scope
1238 if (tree.typarams != null)
1239 for (List<JCTypeParameter> typarams = tree.typarams;
1240 typarams.nonEmpty();
1241 typarams = typarams.tail)
1242 baseScope.enter(typarams.head.type.tsym);
1243 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
1244 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
1245 localEnv.baseClause = true;
1246 localEnv.outer = outer;
1247 localEnv.info.isSelfCall = false;
1248 return localEnv;
1249 }
1251 /** Enter member fields and methods of a class
1252 * @param env the environment current for the class block.
1253 */
1254 private void finish(Env<AttrContext> env) {
1255 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1256 try {
1257 JCClassDecl tree = (JCClassDecl)env.tree;
1258 finishClass(tree, env);
1259 } finally {
1260 log.useSource(prev);
1261 }
1262 }
1264 /** Generate a base clause for an enum type.
1265 * @param pos The position for trees and diagnostics, if any
1266 * @param c The class symbol of the enum
1267 */
1268 private JCExpression enumBase(int pos, ClassSymbol c) {
1269 JCExpression result = make.at(pos).
1270 TypeApply(make.QualIdent(syms.enumSym),
1271 List.<JCExpression>of(make.Type(c.type)));
1272 return result;
1273 }
1275 Type modelMissingTypes(Type t, final JCExpression tree, final boolean interfaceExpected) {
1276 if (!t.hasTag(ERROR))
1277 return t;
1279 return new ErrorType(((ErrorType) t).getOriginalType(), t.tsym) {
1280 private Type modelType;
1282 @Override
1283 public Type getModelType() {
1284 if (modelType == null)
1285 modelType = new Synthesizer(getOriginalType(), interfaceExpected).visit(tree);
1286 return modelType;
1287 }
1288 };
1289 }
1290 // where
1291 private class Synthesizer extends JCTree.Visitor {
1292 Type originalType;
1293 boolean interfaceExpected;
1294 List<ClassSymbol> synthesizedSymbols = List.nil();
1295 Type result;
1297 Synthesizer(Type originalType, boolean interfaceExpected) {
1298 this.originalType = originalType;
1299 this.interfaceExpected = interfaceExpected;
1300 }
1302 Type visit(JCTree tree) {
1303 tree.accept(this);
1304 return result;
1305 }
1307 List<Type> visit(List<? extends JCTree> trees) {
1308 ListBuffer<Type> lb = new ListBuffer<Type>();
1309 for (JCTree t: trees)
1310 lb.append(visit(t));
1311 return lb.toList();
1312 }
1314 @Override
1315 public void visitTree(JCTree tree) {
1316 result = syms.errType;
1317 }
1319 @Override
1320 public void visitIdent(JCIdent tree) {
1321 if (!tree.type.hasTag(ERROR)) {
1322 result = tree.type;
1323 } else {
1324 result = synthesizeClass(tree.name, syms.unnamedPackage).type;
1325 }
1326 }
1328 @Override
1329 public void visitSelect(JCFieldAccess tree) {
1330 if (!tree.type.hasTag(ERROR)) {
1331 result = tree.type;
1332 } else {
1333 Type selectedType;
1334 boolean prev = interfaceExpected;
1335 try {
1336 interfaceExpected = false;
1337 selectedType = visit(tree.selected);
1338 } finally {
1339 interfaceExpected = prev;
1340 }
1341 ClassSymbol c = synthesizeClass(tree.name, selectedType.tsym);
1342 result = c.type;
1343 }
1344 }
1346 @Override
1347 public void visitTypeApply(JCTypeApply tree) {
1348 if (!tree.type.hasTag(ERROR)) {
1349 result = tree.type;
1350 } else {
1351 ClassType clazzType = (ClassType) visit(tree.clazz);
1352 if (synthesizedSymbols.contains(clazzType.tsym))
1353 synthesizeTyparams((ClassSymbol) clazzType.tsym, tree.arguments.size());
1354 final List<Type> actuals = visit(tree.arguments);
1355 result = new ErrorType(tree.type, clazzType.tsym) {
1356 @Override
1357 public List<Type> getTypeArguments() {
1358 return actuals;
1359 }
1360 };
1361 }
1362 }
1364 ClassSymbol synthesizeClass(Name name, Symbol owner) {
1365 int flags = interfaceExpected ? INTERFACE : 0;
1366 ClassSymbol c = new ClassSymbol(flags, name, owner);
1367 c.members_field = new Scope.ErrorScope(c);
1368 c.type = new ErrorType(originalType, c) {
1369 @Override
1370 public List<Type> getTypeArguments() {
1371 return typarams_field;
1372 }
1373 };
1374 synthesizedSymbols = synthesizedSymbols.prepend(c);
1375 return c;
1376 }
1378 void synthesizeTyparams(ClassSymbol sym, int n) {
1379 ClassType ct = (ClassType) sym.type;
1380 Assert.check(ct.typarams_field.isEmpty());
1381 if (n == 1) {
1382 TypeVar v = new TypeVar(names.fromString("T"), sym, syms.botType);
1383 ct.typarams_field = ct.typarams_field.prepend(v);
1384 } else {
1385 for (int i = n; i > 0; i--) {
1386 TypeVar v = new TypeVar(names.fromString("T" + i), sym, syms.botType);
1387 ct.typarams_field = ct.typarams_field.prepend(v);
1388 }
1389 }
1390 }
1391 }
1394 /* ***************************************************************************
1395 * tree building
1396 ****************************************************************************/
1398 /** Generate default constructor for given class. For classes different
1399 * from java.lang.Object, this is:
1400 *
1401 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1402 * super(x_0, ..., x_n)
1403 * }
1404 *
1405 * or, if based == true:
1406 *
1407 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1408 * x_0.super(x_1, ..., x_n)
1409 * }
1410 *
1411 * @param make The tree factory.
1412 * @param c The class owning the default constructor.
1413 * @param argtypes The parameter types of the constructor.
1414 * @param thrown The thrown exceptions of the constructor.
1415 * @param based Is first parameter a this$n?
1416 */
1417 JCTree DefaultConstructor(TreeMaker make,
1418 ClassSymbol c,
1419 MethodSymbol baseInit,
1420 List<Type> typarams,
1421 List<Type> argtypes,
1422 List<Type> thrown,
1423 long flags,
1424 boolean based) {
1425 JCTree result;
1426 if ((c.flags() & ENUM) != 0 &&
1427 (types.supertype(c.type).tsym == syms.enumSym)) {
1428 // constructors of true enums are private
1429 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
1430 } else
1431 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
1432 if (c.name.isEmpty()) {
1433 flags |= ANONCONSTR;
1434 }
1435 Type mType = new MethodType(argtypes, null, thrown, c);
1436 Type initType = typarams.nonEmpty() ?
1437 new ForAll(typarams, mType) :
1438 mType;
1439 MethodSymbol init = new MethodSymbol(flags, names.init,
1440 initType, c);
1441 init.params = createDefaultConstructorParams(make, baseInit, init,
1442 argtypes, based);
1443 List<JCVariableDecl> params = make.Params(argtypes, init);
1444 List<JCStatement> stats = List.nil();
1445 if (c.type != syms.objectType) {
1446 stats = stats.prepend(SuperCall(make, typarams, params, based));
1447 }
1448 result = make.MethodDef(init, make.Block(0, stats));
1449 return result;
1450 }
1452 private List<VarSymbol> createDefaultConstructorParams(
1453 TreeMaker make,
1454 MethodSymbol baseInit,
1455 MethodSymbol init,
1456 List<Type> argtypes,
1457 boolean based) {
1458 List<VarSymbol> initParams = null;
1459 List<Type> argTypesList = argtypes;
1460 if (based) {
1461 /* In this case argtypes will have an extra type, compared to baseInit,
1462 * corresponding to the type of the enclosing instance i.e.:
1463 *
1464 * Inner i = outer.new Inner(1){}
1465 *
1466 * in the above example argtypes will be (Outer, int) and baseInit
1467 * will have parameter's types (int). So in this case we have to add
1468 * first the extra type in argtypes and then get the names of the
1469 * parameters from baseInit.
1470 */
1471 initParams = List.nil();
1472 VarSymbol param = new VarSymbol(0, make.paramName(0), argtypes.head, init);
1473 initParams = initParams.append(param);
1474 argTypesList = argTypesList.tail;
1475 }
1476 if (baseInit != null && baseInit.params != null &&
1477 baseInit.params.nonEmpty() && argTypesList.nonEmpty()) {
1478 initParams = (initParams == null) ? List.<VarSymbol>nil() : initParams;
1479 List<VarSymbol> baseInitParams = baseInit.params;
1480 while (baseInitParams.nonEmpty() && argTypesList.nonEmpty()) {
1481 VarSymbol param = new VarSymbol(baseInitParams.head.flags(),
1482 baseInitParams.head.name, argTypesList.head, init);
1483 initParams = initParams.append(param);
1484 baseInitParams = baseInitParams.tail;
1485 argTypesList = argTypesList.tail;
1486 }
1487 }
1488 return initParams;
1489 }
1491 /** Generate call to superclass constructor. This is:
1492 *
1493 * super(id_0, ..., id_n)
1494 *
1495 * or, if based == true
1496 *
1497 * id_0.super(id_1,...,id_n)
1498 *
1499 * where id_0, ..., id_n are the names of the given parameters.
1500 *
1501 * @param make The tree factory
1502 * @param params The parameters that need to be passed to super
1503 * @param typarams The type parameters that need to be passed to super
1504 * @param based Is first parameter a this$n?
1505 */
1506 JCExpressionStatement SuperCall(TreeMaker make,
1507 List<Type> typarams,
1508 List<JCVariableDecl> params,
1509 boolean based) {
1510 JCExpression meth;
1511 if (based) {
1512 meth = make.Select(make.Ident(params.head), names._super);
1513 params = params.tail;
1514 } else {
1515 meth = make.Ident(names._super);
1516 }
1517 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
1518 return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
1519 }
1520 }
