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src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@7c537f4298fb
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
Mon, 10 Jan 2011 15:08:31 -0800
- author
- jjg
- date
- Mon, 10 Jan 2011 15:08:31 -0800
- changeset 816
- 7c537f4298fb
- parent 815
- d17f37522154
- child 822
- 712be35e40b5
- permissions
- -rw-r--r--
6396503: javac should not require assertions enabled
Reviewed-by: mcimadamore
1 /*
2 * Copyright (c) 2003, 2011, 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;
80 private final boolean allowSimplifiedVarargs;
82 public static MemberEnter instance(Context context) {
83 MemberEnter instance = context.get(memberEnterKey);
84 if (instance == null)
85 instance = new MemberEnter(context);
86 return instance;
87 }
89 protected MemberEnter(Context context) {
90 context.put(memberEnterKey, this);
91 names = Names.instance(context);
92 enter = Enter.instance(context);
93 log = Log.instance(context);
94 chk = Check.instance(context);
95 attr = Attr.instance(context);
96 syms = Symtab.instance(context);
97 scopeCounter = Scope.ScopeCounter.instance(context);
98 make = TreeMaker.instance(context);
99 reader = ClassReader.instance(context);
100 todo = Todo.instance(context);
101 annotate = Annotate.instance(context);
102 types = Types.instance(context);
103 diags = JCDiagnostic.Factory.instance(context);
104 target = Target.instance(context);
105 Options options = Options.instance(context);
106 skipAnnotations = options.isSet("skipAnnotations");
107 Source source = Source.instance(context);
108 allowSimplifiedVarargs = source.allowSimplifiedVarargs();
109 }
111 /** A queue for classes whose members still need to be entered into the
112 * symbol table.
113 */
114 ListBuffer<Env<AttrContext>> halfcompleted = new ListBuffer<Env<AttrContext>>();
116 /** Set to true only when the first of a set of classes is
117 * processed from the halfcompleted queue.
118 */
119 boolean isFirst = true;
121 /** A flag to disable completion from time to time during member
122 * enter, as we only need to look up types. This avoids
123 * unnecessarily deep recursion.
124 */
125 boolean completionEnabled = true;
127 /* ---------- Processing import clauses ----------------
128 */
130 /** Import all classes of a class or package on demand.
131 * @param pos Position to be used for error reporting.
132 * @param tsym The class or package the members of which are imported.
133 * @param toScope The (import) scope in which imported classes
134 * are entered.
135 */
136 private void importAll(int pos,
137 final TypeSymbol tsym,
138 Env<AttrContext> env) {
139 // Check that packages imported from exist (JLS ???).
140 if (tsym.kind == PCK && tsym.members().elems == null && !tsym.exists()) {
141 // If we can't find java.lang, exit immediately.
142 if (((PackageSymbol)tsym).fullname.equals(names.java_lang)) {
143 JCDiagnostic msg = diags.fragment("fatal.err.no.java.lang");
144 throw new FatalError(msg);
145 } else {
146 log.error(pos, "doesnt.exist", tsym);
147 }
148 }
149 env.toplevel.starImportScope.importAll(tsym.members());
150 }
152 /** Import all static members of a class or package on demand.
153 * @param pos Position to be used for error reporting.
154 * @param tsym The class or package the members of which are imported.
155 * @param toScope The (import) scope in which imported classes
156 * are entered.
157 */
158 private void importStaticAll(int pos,
159 final TypeSymbol tsym,
160 Env<AttrContext> env) {
161 final JavaFileObject sourcefile = env.toplevel.sourcefile;
162 final Scope toScope = env.toplevel.starImportScope;
163 final PackageSymbol packge = env.toplevel.packge;
164 final TypeSymbol origin = tsym;
166 // enter imported types immediately
167 new Object() {
168 Set<Symbol> processed = new HashSet<Symbol>();
169 void importFrom(TypeSymbol tsym) {
170 if (tsym == null || !processed.add(tsym))
171 return;
173 // also import inherited names
174 importFrom(types.supertype(tsym.type).tsym);
175 for (Type t : types.interfaces(tsym.type))
176 importFrom(t.tsym);
178 final Scope fromScope = tsym.members();
179 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
180 Symbol sym = e.sym;
181 if (sym.kind == TYP &&
182 (sym.flags() & STATIC) != 0 &&
183 staticImportAccessible(sym, packge) &&
184 sym.isMemberOf(origin, types) &&
185 !toScope.includes(sym))
186 toScope.enter(sym, fromScope, origin.members());
187 }
188 }
189 }.importFrom(tsym);
191 // enter non-types before annotations that might use them
192 annotate.earlier(new Annotate.Annotator() {
193 Set<Symbol> processed = new HashSet<Symbol>();
195 public String toString() {
196 return "import static " + tsym + ".*" + " in " + sourcefile;
197 }
198 void importFrom(TypeSymbol tsym) {
199 if (tsym == null || !processed.add(tsym))
200 return;
202 // also import inherited names
203 importFrom(types.supertype(tsym.type).tsym);
204 for (Type t : types.interfaces(tsym.type))
205 importFrom(t.tsym);
207 final Scope fromScope = tsym.members();
208 for (Scope.Entry e = fromScope.elems; e != null; e = e.sibling) {
209 Symbol sym = e.sym;
210 if (sym.isStatic() && sym.kind != TYP &&
211 staticImportAccessible(sym, packge) &&
212 !toScope.includes(sym) &&
213 sym.isMemberOf(origin, types)) {
214 toScope.enter(sym, fromScope, origin.members());
215 }
216 }
217 }
218 public void enterAnnotation() {
219 importFrom(tsym);
220 }
221 });
222 }
224 // is the sym accessible everywhere in packge?
225 boolean staticImportAccessible(Symbol sym, PackageSymbol packge) {
226 int flags = (int)(sym.flags() & AccessFlags);
227 switch (flags) {
228 default:
229 case PUBLIC:
230 return true;
231 case PRIVATE:
232 return false;
233 case 0:
234 case PROTECTED:
235 return sym.packge() == packge;
236 }
237 }
239 /** Import statics types of a given name. Non-types are handled in Attr.
240 * @param pos Position to be used for error reporting.
241 * @param tsym The class from which the name is imported.
242 * @param name The (simple) name being imported.
243 * @param env The environment containing the named import
244 * scope to add to.
245 */
246 private void importNamedStatic(final DiagnosticPosition pos,
247 final TypeSymbol tsym,
248 final Name name,
249 final Env<AttrContext> env) {
250 if (tsym.kind != TYP) {
251 log.error(pos, "static.imp.only.classes.and.interfaces");
252 return;
253 }
255 final Scope toScope = env.toplevel.namedImportScope;
256 final PackageSymbol packge = env.toplevel.packge;
257 final TypeSymbol origin = tsym;
259 // enter imported types immediately
260 new Object() {
261 Set<Symbol> processed = new HashSet<Symbol>();
262 void importFrom(TypeSymbol tsym) {
263 if (tsym == null || !processed.add(tsym))
264 return;
266 // also import inherited names
267 importFrom(types.supertype(tsym.type).tsym);
268 for (Type t : types.interfaces(tsym.type))
269 importFrom(t.tsym);
271 for (Scope.Entry e = tsym.members().lookup(name);
272 e.scope != null;
273 e = e.next()) {
274 Symbol sym = e.sym;
275 if (sym.isStatic() &&
276 sym.kind == TYP &&
277 staticImportAccessible(sym, packge) &&
278 sym.isMemberOf(origin, types) &&
279 chk.checkUniqueStaticImport(pos, sym, toScope))
280 toScope.enter(sym, sym.owner.members(), origin.members());
281 }
282 }
283 }.importFrom(tsym);
285 // enter non-types before annotations that might use them
286 annotate.earlier(new Annotate.Annotator() {
287 Set<Symbol> processed = new HashSet<Symbol>();
288 boolean found = false;
290 public String toString() {
291 return "import static " + tsym + "." + name;
292 }
293 void importFrom(TypeSymbol tsym) {
294 if (tsym == null || !processed.add(tsym))
295 return;
297 // also import inherited names
298 importFrom(types.supertype(tsym.type).tsym);
299 for (Type t : types.interfaces(tsym.type))
300 importFrom(t.tsym);
302 for (Scope.Entry e = tsym.members().lookup(name);
303 e.scope != null;
304 e = e.next()) {
305 Symbol sym = e.sym;
306 if (sym.isStatic() &&
307 staticImportAccessible(sym, packge) &&
308 sym.isMemberOf(origin, types)) {
309 found = true;
310 if (sym.kind == MTH ||
311 sym.kind != TYP && chk.checkUniqueStaticImport(pos, sym, toScope))
312 toScope.enter(sym, sym.owner.members(), origin.members());
313 }
314 }
315 }
316 public void enterAnnotation() {
317 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
318 try {
319 importFrom(tsym);
320 if (!found) {
321 log.error(pos, "cant.resolve.location",
322 KindName.STATIC,
323 name, List.<Type>nil(), List.<Type>nil(),
324 Kinds.typeKindName(tsym.type),
325 tsym.type);
326 }
327 } finally {
328 log.useSource(prev);
329 }
330 }
331 });
332 }
333 /** Import given class.
334 * @param pos Position to be used for error reporting.
335 * @param tsym The class to be imported.
336 * @param env The environment containing the named import
337 * scope to add to.
338 */
339 private void importNamed(DiagnosticPosition pos, Symbol tsym, Env<AttrContext> env) {
340 if (tsym.kind == TYP &&
341 chk.checkUniqueImport(pos, tsym, env.toplevel.namedImportScope))
342 env.toplevel.namedImportScope.enter(tsym, tsym.owner.members());
343 }
345 /** Construct method type from method signature.
346 * @param typarams The method's type parameters.
347 * @param params The method's value parameters.
348 * @param res The method's result type,
349 * null if it is a constructor.
350 * @param thrown The method's thrown exceptions.
351 * @param env The method's (local) environment.
352 */
353 Type signature(List<JCTypeParameter> typarams,
354 List<JCVariableDecl> params,
355 JCTree res,
356 List<JCExpression> thrown,
357 Env<AttrContext> env) {
359 // Enter and attribute type parameters.
360 List<Type> tvars = enter.classEnter(typarams, env);
361 attr.attribTypeVariables(typarams, env);
363 // Enter and attribute value parameters.
364 ListBuffer<Type> argbuf = new ListBuffer<Type>();
365 for (List<JCVariableDecl> l = params; l.nonEmpty(); l = l.tail) {
366 memberEnter(l.head, env);
367 argbuf.append(l.head.vartype.type);
368 }
370 // Attribute result type, if one is given.
371 Type restype = res == null ? syms.voidType : attr.attribType(res, env);
373 // Attribute thrown exceptions.
374 ListBuffer<Type> thrownbuf = new ListBuffer<Type>();
375 for (List<JCExpression> l = thrown; l.nonEmpty(); l = l.tail) {
376 Type exc = attr.attribType(l.head, env);
377 if (exc.tag != TYPEVAR)
378 exc = chk.checkClassType(l.head.pos(), exc);
379 thrownbuf.append(exc);
380 }
381 Type mtype = new MethodType(argbuf.toList(),
382 restype,
383 thrownbuf.toList(),
384 syms.methodClass);
385 return tvars.isEmpty() ? mtype : new ForAll(tvars, mtype);
386 }
388 /* ********************************************************************
389 * Visitor methods for member enter
390 *********************************************************************/
392 /** Visitor argument: the current environment
393 */
394 protected Env<AttrContext> env;
396 /** Enter field and method definitions and process import
397 * clauses, catching any completion failure exceptions.
398 */
399 protected void memberEnter(JCTree tree, Env<AttrContext> env) {
400 Env<AttrContext> prevEnv = this.env;
401 try {
402 this.env = env;
403 tree.accept(this);
404 } catch (CompletionFailure ex) {
405 chk.completionError(tree.pos(), ex);
406 } finally {
407 this.env = prevEnv;
408 }
409 }
411 /** Enter members from a list of trees.
412 */
413 void memberEnter(List<? extends JCTree> trees, Env<AttrContext> env) {
414 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
415 memberEnter(l.head, env);
416 }
418 /** Enter members for a class.
419 */
420 void finishClass(JCClassDecl tree, Env<AttrContext> env) {
421 if ((tree.mods.flags & Flags.ENUM) != 0 &&
422 (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) {
423 addEnumMembers(tree, env);
424 }
425 memberEnter(tree.defs, env);
426 }
428 /** Add the implicit members for an enum type
429 * to the symbol table.
430 */
431 private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) {
432 JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass));
434 // public static T[] values() { return ???; }
435 JCMethodDecl values = make.
436 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
437 names.values,
438 valuesType,
439 List.<JCTypeParameter>nil(),
440 List.<JCVariableDecl>nil(),
441 List.<JCExpression>nil(), // thrown
442 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
443 null);
444 memberEnter(values, env);
446 // public static T valueOf(String name) { return ???; }
447 JCMethodDecl valueOf = make.
448 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC),
449 names.valueOf,
450 make.Type(tree.sym.type),
451 List.<JCTypeParameter>nil(),
452 List.of(make.VarDef(make.Modifiers(Flags.PARAMETER),
453 names.fromString("name"),
454 make.Type(syms.stringType), null)),
455 List.<JCExpression>nil(), // thrown
456 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))),
457 null);
458 memberEnter(valueOf, env);
460 // the remaining members are for bootstrapping only
461 if (!target.compilerBootstrap(tree.sym)) return;
463 // public final int ordinal() { return ???; }
464 JCMethodDecl ordinal = make.at(tree.pos).
465 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.FINAL),
466 names.ordinal,
467 make.Type(syms.intType),
468 List.<JCTypeParameter>nil(),
469 List.<JCVariableDecl>nil(),
470 List.<JCExpression>nil(),
471 null,
472 null);
473 memberEnter(ordinal, env);
475 // public final String name() { return ???; }
476 JCMethodDecl name = make.
477 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.FINAL),
478 names._name,
479 make.Type(syms.stringType),
480 List.<JCTypeParameter>nil(),
481 List.<JCVariableDecl>nil(),
482 List.<JCExpression>nil(),
483 null,
484 null);
485 memberEnter(name, env);
487 // public int compareTo(E other) { return ???; }
488 MethodSymbol compareTo = new
489 MethodSymbol(Flags.PUBLIC,
490 names.compareTo,
491 new MethodType(List.of(tree.sym.type),
492 syms.intType,
493 List.<Type>nil(),
494 syms.methodClass),
495 tree.sym);
496 memberEnter(make.MethodDef(compareTo, null), env);
497 }
499 public void visitTopLevel(JCCompilationUnit tree) {
500 if (tree.starImportScope.elems != null) {
501 // we must have already processed this toplevel
502 return;
503 }
505 // check that no class exists with same fully qualified name as
506 // toplevel package
507 if (checkClash && tree.pid != null) {
508 Symbol p = tree.packge;
509 while (p.owner != syms.rootPackage) {
510 p.owner.complete(); // enter all class members of p
511 if (syms.classes.get(p.getQualifiedName()) != null) {
512 log.error(tree.pos,
513 "pkg.clashes.with.class.of.same.name",
514 p);
515 }
516 p = p.owner;
517 }
518 }
520 // process package annotations
521 annotateLater(tree.packageAnnotations, env, tree.packge);
523 // Import-on-demand java.lang.
524 importAll(tree.pos, reader.enterPackage(names.java_lang), env);
526 // Process all import clauses.
527 memberEnter(tree.defs, env);
528 }
530 // process the non-static imports and the static imports of types.
531 public void visitImport(JCImport tree) {
532 JCTree imp = tree.qualid;
533 Name name = TreeInfo.name(imp);
534 TypeSymbol p;
536 // Create a local environment pointing to this tree to disable
537 // effects of other imports in Resolve.findGlobalType
538 Env<AttrContext> localEnv = env.dup(tree);
540 // Attribute qualifying package or class.
541 JCFieldAccess s = (JCFieldAccess) imp;
542 p = attr.
543 attribTree(s.selected,
544 localEnv,
545 tree.staticImport ? TYP : (TYP | PCK),
546 Type.noType).tsym;
547 if (name == names.asterisk) {
548 // Import on demand.
549 chk.checkCanonical(s.selected);
550 if (tree.staticImport)
551 importStaticAll(tree.pos, p, env);
552 else
553 importAll(tree.pos, p, env);
554 } else {
555 // Named type import.
556 if (tree.staticImport) {
557 importNamedStatic(tree.pos(), p, name, localEnv);
558 chk.checkCanonical(s.selected);
559 } else {
560 TypeSymbol c = attribImportType(imp, localEnv).tsym;
561 chk.checkCanonical(imp);
562 importNamed(tree.pos(), c, env);
563 }
564 }
565 }
567 public void visitMethodDef(JCMethodDecl tree) {
568 Scope enclScope = enter.enterScope(env);
569 MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
570 m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
571 tree.sym = m;
572 Env<AttrContext> localEnv = methodEnv(tree, env);
574 // Compute the method type
575 m.type = signature(tree.typarams, tree.params,
576 tree.restype, tree.thrown,
577 localEnv);
579 // Set m.params
580 ListBuffer<VarSymbol> params = new ListBuffer<VarSymbol>();
581 JCVariableDecl lastParam = null;
582 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
583 JCVariableDecl param = lastParam = l.head;
584 params.append(Assert.checkNonNull(param.sym));
585 }
586 m.params = params.toList();
588 // mark the method varargs, if necessary
589 if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
590 m.flags_field |= Flags.VARARGS;
592 localEnv.info.scope.leave();
593 if (chk.checkUnique(tree.pos(), m, enclScope)) {
594 enclScope.enter(m);
595 }
596 annotateLater(tree.mods.annotations, localEnv, m);
597 if (tree.defaultValue != null)
598 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
599 }
601 /** Create a fresh environment for method bodies.
602 * @param tree The method definition.
603 * @param env The environment current outside of the method definition.
604 */
605 Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
606 Env<AttrContext> localEnv =
607 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
608 localEnv.enclMethod = tree;
609 localEnv.info.scope.owner = tree.sym;
610 if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++;
611 return localEnv;
612 }
614 public void visitVarDef(JCVariableDecl tree) {
615 Env<AttrContext> localEnv = env;
616 if ((tree.mods.flags & STATIC) != 0 ||
617 (env.info.scope.owner.flags() & INTERFACE) != 0) {
618 localEnv = env.dup(tree, env.info.dup());
619 localEnv.info.staticLevel++;
620 }
621 attr.attribType(tree.vartype, localEnv);
622 if ((tree.mods.flags & VARARGS) != 0) {
623 //if we are entering a varargs parameter, we need to replace its type
624 //(a plain array type) with the more precise VarargsType --- we need
625 //to do it this way because varargs is represented in the tree as a modifier
626 //on the parameter declaration, and not as a distinct type of array node.
627 ArrayType atype = (ArrayType)tree.vartype.type;
628 tree.vartype.type = atype.makeVarargs();
629 }
630 Scope enclScope = enter.enterScope(env);
631 VarSymbol v =
632 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
633 v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
634 tree.sym = v;
635 if (tree.init != null) {
636 v.flags_field |= HASINIT;
637 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
638 Env<AttrContext> initEnv = getInitEnv(tree, env);
639 initEnv.info.enclVar = v;
640 v.setLazyConstValue(initEnv(tree, initEnv), log, attr, tree.init);
641 }
642 }
643 if (chk.checkUnique(tree.pos(), v, enclScope)) {
644 chk.checkTransparentVar(tree.pos(), v, enclScope);
645 enclScope.enter(v);
646 }
647 annotateLater(tree.mods.annotations, localEnv, v);
648 v.pos = tree.pos;
649 }
651 /** Create a fresh environment for a variable's initializer.
652 * If the variable is a field, the owner of the environment's scope
653 * is be the variable itself, otherwise the owner is the method
654 * enclosing the variable definition.
655 *
656 * @param tree The variable definition.
657 * @param env The environment current outside of the variable definition.
658 */
659 Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
660 Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
661 if (tree.sym.owner.kind == TYP) {
662 localEnv.info.scope = new Scope.DelegatedScope(env.info.scope);
663 localEnv.info.scope.owner = tree.sym;
664 }
665 if ((tree.mods.flags & STATIC) != 0 ||
666 (env.enclClass.sym.flags() & INTERFACE) != 0)
667 localEnv.info.staticLevel++;
668 return localEnv;
669 }
671 /** Default member enter visitor method: do nothing
672 */
673 public void visitTree(JCTree tree) {
674 }
676 public void visitErroneous(JCErroneous tree) {
677 if (tree.errs != null)
678 memberEnter(tree.errs, env);
679 }
681 public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
682 Env<AttrContext> mEnv = methodEnv(tree, env);
683 mEnv.info.lint = mEnv.info.lint.augment(tree.sym.attributes_field, tree.sym.flags());
684 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
685 mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
686 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
687 mEnv.info.scope.enterIfAbsent(l.head.sym);
688 return mEnv;
689 }
691 public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
692 Env<AttrContext> iEnv = initEnv(tree, env);
693 return iEnv;
694 }
696 /* ********************************************************************
697 * Type completion
698 *********************************************************************/
700 Type attribImportType(JCTree tree, Env<AttrContext> env) {
701 Assert.check(completionEnabled);
702 try {
703 // To prevent deep recursion, suppress completion of some
704 // types.
705 completionEnabled = false;
706 return attr.attribType(tree, env);
707 } finally {
708 completionEnabled = true;
709 }
710 }
712 /* ********************************************************************
713 * Annotation processing
714 *********************************************************************/
716 /** Queue annotations for later processing. */
717 void annotateLater(final List<JCAnnotation> annotations,
718 final Env<AttrContext> localEnv,
719 final Symbol s) {
720 if (annotations.isEmpty()) return;
721 if (s.kind != PCK) s.attributes_field = null; // mark it incomplete for now
722 annotate.later(new Annotate.Annotator() {
723 public String toString() {
724 return "annotate " + annotations + " onto " + s + " in " + s.owner;
725 }
726 public void enterAnnotation() {
727 Assert.check(s.kind == PCK || s.attributes_field == null);
728 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
729 try {
730 if (s.attributes_field != null &&
731 s.attributes_field.nonEmpty() &&
732 annotations.nonEmpty())
733 log.error(annotations.head.pos,
734 "already.annotated",
735 kindName(s), s);
736 enterAnnotations(annotations, localEnv, s);
737 } finally {
738 log.useSource(prev);
739 }
740 }
741 });
742 }
744 /**
745 * Check if a list of annotations contains a reference to
746 * java.lang.Deprecated.
747 **/
748 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
749 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
750 JCAnnotation a = al.head;
751 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
752 return true;
753 }
754 return false;
755 }
758 /** Enter a set of annotations. */
759 private void enterAnnotations(List<JCAnnotation> annotations,
760 Env<AttrContext> env,
761 Symbol s) {
762 ListBuffer<Attribute.Compound> buf =
763 new ListBuffer<Attribute.Compound>();
764 Set<TypeSymbol> annotated = new HashSet<TypeSymbol>();
765 if (!skipAnnotations)
766 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
767 JCAnnotation a = al.head;
768 Attribute.Compound c = annotate.enterAnnotation(a,
769 syms.annotationType,
770 env);
771 if (c == null) continue;
772 buf.append(c);
773 // Note: @Deprecated has no effect on local variables and parameters
774 if (!c.type.isErroneous()
775 && s.owner.kind != MTH
776 && types.isSameType(c.type, syms.deprecatedType))
777 s.flags_field |= Flags.DEPRECATED;
778 // Internally to java.dyn, a @PolymorphicSignature annotation
779 // acts like a classfile attribute.
780 if (!c.type.isErroneous() &&
781 types.isSameType(c.type, syms.polymorphicSignatureType)) {
782 if (!target.hasMethodHandles()) {
783 // Somebody is compiling JDK7 source code to a JDK6 target.
784 // Make it a strict warning, since it is unlikely but important.
785 log.strictWarning(env.tree.pos(),
786 "wrong.target.for.polymorphic.signature.definition",
787 target.name);
788 }
789 // Pull the flag through for better diagnostics, even on a bad target.
790 s.flags_field |= Flags.POLYMORPHIC_SIGNATURE;
791 }
792 if (!annotated.add(a.type.tsym))
793 log.error(a.pos, "duplicate.annotation");
794 }
795 s.attributes_field = buf.toList();
796 }
798 /** Queue processing of an attribute default value. */
799 void annotateDefaultValueLater(final JCExpression defaultValue,
800 final Env<AttrContext> localEnv,
801 final MethodSymbol m) {
802 annotate.later(new Annotate.Annotator() {
803 public String toString() {
804 return "annotate " + m.owner + "." +
805 m + " default " + defaultValue;
806 }
807 public void enterAnnotation() {
808 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
809 try {
810 enterDefaultValue(defaultValue, localEnv, m);
811 } finally {
812 log.useSource(prev);
813 }
814 }
815 });
816 }
818 /** Enter a default value for an attribute method. */
819 private void enterDefaultValue(final JCExpression defaultValue,
820 final Env<AttrContext> localEnv,
821 final MethodSymbol m) {
822 m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
823 defaultValue,
824 localEnv);
825 }
827 /* ********************************************************************
828 * Source completer
829 *********************************************************************/
831 /** Complete entering a class.
832 * @param sym The symbol of the class to be completed.
833 */
834 public void complete(Symbol sym) throws CompletionFailure {
835 // Suppress some (recursive) MemberEnter invocations
836 if (!completionEnabled) {
837 // Re-install same completer for next time around and return.
838 Assert.check((sym.flags() & Flags.COMPOUND) == 0);
839 sym.completer = this;
840 return;
841 }
843 ClassSymbol c = (ClassSymbol)sym;
844 ClassType ct = (ClassType)c.type;
845 Env<AttrContext> env = enter.typeEnvs.get(c);
846 JCClassDecl tree = (JCClassDecl)env.tree;
847 boolean wasFirst = isFirst;
848 isFirst = false;
850 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
851 try {
852 // Save class environment for later member enter (2) processing.
853 halfcompleted.append(env);
855 // Mark class as not yet attributed.
856 c.flags_field |= UNATTRIBUTED;
858 // If this is a toplevel-class, make sure any preceding import
859 // clauses have been seen.
860 if (c.owner.kind == PCK) {
861 memberEnter(env.toplevel, env.enclosing(JCTree.TOPLEVEL));
862 todo.append(env);
863 }
865 if (c.owner.kind == TYP)
866 c.owner.complete();
868 // create an environment for evaluating the base clauses
869 Env<AttrContext> baseEnv = baseEnv(tree, env);
871 // Determine supertype.
872 Type supertype =
873 (tree.extending != null)
874 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
875 : ((tree.mods.flags & Flags.ENUM) != 0 && !target.compilerBootstrap(c))
876 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
877 true, false, false)
878 : (c.fullname == names.java_lang_Object)
879 ? Type.noType
880 : syms.objectType;
881 ct.supertype_field = supertype;
883 // Determine interfaces.
884 ListBuffer<Type> interfaces = new ListBuffer<Type>();
885 Set<Type> interfaceSet = new HashSet<Type>();
886 List<JCExpression> interfaceTrees = tree.implementing;
887 if ((tree.mods.flags & Flags.ENUM) != 0 && target.compilerBootstrap(c)) {
888 // add interface Comparable<T>
889 interfaceTrees =
890 interfaceTrees.prepend(make.Type(new ClassType(syms.comparableType.getEnclosingType(),
891 List.of(c.type),
892 syms.comparableType.tsym)));
893 // add interface Serializable
894 interfaceTrees =
895 interfaceTrees.prepend(make.Type(syms.serializableType));
896 }
897 for (JCExpression iface : interfaceTrees) {
898 Type i = attr.attribBase(iface, baseEnv, false, true, true);
899 if (i.tag == CLASS) {
900 interfaces.append(i);
901 chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
902 }
903 }
904 if ((c.flags_field & ANNOTATION) != 0)
905 ct.interfaces_field = List.of(syms.annotationType);
906 else
907 ct.interfaces_field = interfaces.toList();
909 if (c.fullname == names.java_lang_Object) {
910 if (tree.extending != null) {
911 chk.checkNonCyclic(tree.extending.pos(),
912 supertype);
913 ct.supertype_field = Type.noType;
914 }
915 else if (tree.implementing.nonEmpty()) {
916 chk.checkNonCyclic(tree.implementing.head.pos(),
917 ct.interfaces_field.head);
918 ct.interfaces_field = List.nil();
919 }
920 }
922 // Annotations.
923 // In general, we cannot fully process annotations yet, but we
924 // can attribute the annotation types and then check to see if the
925 // @Deprecated annotation is present.
926 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
927 if (hasDeprecatedAnnotation(tree.mods.annotations))
928 c.flags_field |= DEPRECATED;
929 annotateLater(tree.mods.annotations, baseEnv, c);
931 chk.checkNonCyclicDecl(tree);
933 attr.attribTypeVariables(tree.typarams, baseEnv);
935 // Add default constructor if needed.
936 if ((c.flags() & INTERFACE) == 0 &&
937 !TreeInfo.hasConstructors(tree.defs)) {
938 List<Type> argtypes = List.nil();
939 List<Type> typarams = List.nil();
940 List<Type> thrown = List.nil();
941 long ctorFlags = 0;
942 boolean based = false;
943 if (c.name.isEmpty()) {
944 JCNewClass nc = (JCNewClass)env.next.tree;
945 if (nc.constructor != null) {
946 Type superConstrType = types.memberType(c.type,
947 nc.constructor);
948 argtypes = superConstrType.getParameterTypes();
949 typarams = superConstrType.getTypeArguments();
950 ctorFlags = nc.constructor.flags() & VARARGS;
951 if (nc.encl != null) {
952 argtypes = argtypes.prepend(nc.encl.type);
953 based = true;
954 }
955 thrown = superConstrType.getThrownTypes();
956 }
957 }
958 JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
959 typarams, argtypes, thrown,
960 ctorFlags, based);
961 tree.defs = tree.defs.prepend(constrDef);
962 }
964 // If this is a class, enter symbols for this and super into
965 // current scope.
966 if ((c.flags_field & INTERFACE) == 0) {
967 VarSymbol thisSym =
968 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
969 thisSym.pos = Position.FIRSTPOS;
970 env.info.scope.enter(thisSym);
971 if (ct.supertype_field.tag == CLASS) {
972 VarSymbol superSym =
973 new VarSymbol(FINAL | HASINIT, names._super,
974 ct.supertype_field, c);
975 superSym.pos = Position.FIRSTPOS;
976 env.info.scope.enter(superSym);
977 }
978 }
980 // check that no package exists with same fully qualified name,
981 // but admit classes in the unnamed package which have the same
982 // name as a top-level package.
983 if (checkClash &&
984 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
985 reader.packageExists(c.fullname))
986 {
987 log.error(tree.pos, "clash.with.pkg.of.same.name", c);
988 }
990 } catch (CompletionFailure ex) {
991 chk.completionError(tree.pos(), ex);
992 } finally {
993 log.useSource(prev);
994 }
996 // Enter all member fields and methods of a set of half completed
997 // classes in a second phase.
998 if (wasFirst) {
999 try {
1000 while (halfcompleted.nonEmpty()) {
1001 finish(halfcompleted.next());
1002 }
1003 } finally {
1004 isFirst = true;
1005 }
1007 // commit pending annotations
1008 annotate.flush();
1009 }
1010 }
1012 private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
1013 Scope baseScope = new Scope.ClassScope(tree.sym, scopeCounter);
1014 //import already entered local classes into base scope
1015 for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
1016 if (e.sym.isLocal()) {
1017 baseScope.enter(e.sym);
1018 }
1019 }
1020 //import current type-parameters into base scope
1021 if (tree.typarams != null)
1022 for (List<JCTypeParameter> typarams = tree.typarams;
1023 typarams.nonEmpty();
1024 typarams = typarams.tail)
1025 baseScope.enter(typarams.head.type.tsym);
1026 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
1027 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
1028 localEnv.baseClause = true;
1029 localEnv.outer = outer;
1030 localEnv.info.isSelfCall = false;
1031 return localEnv;
1032 }
1034 /** Enter member fields and methods of a class
1035 * @param env the environment current for the class block.
1036 */
1037 private void finish(Env<AttrContext> env) {
1038 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1039 try {
1040 JCClassDecl tree = (JCClassDecl)env.tree;
1041 finishClass(tree, env);
1042 } finally {
1043 log.useSource(prev);
1044 }
1045 }
1047 /** Generate a base clause for an enum type.
1048 * @param pos The position for trees and diagnostics, if any
1049 * @param c The class symbol of the enum
1050 */
1051 private JCExpression enumBase(int pos, ClassSymbol c) {
1052 JCExpression result = make.at(pos).
1053 TypeApply(make.QualIdent(syms.enumSym),
1054 List.<JCExpression>of(make.Type(c.type)));
1055 return result;
1056 }
1058 /* ***************************************************************************
1059 * tree building
1060 ****************************************************************************/
1062 /** Generate default constructor for given class. For classes different
1063 * from java.lang.Object, this is:
1064 *
1065 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1066 * super(x_0, ..., x_n)
1067 * }
1068 *
1069 * or, if based == true:
1070 *
1071 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1072 * x_0.super(x_1, ..., x_n)
1073 * }
1074 *
1075 * @param make The tree factory.
1076 * @param c The class owning the default constructor.
1077 * @param argtypes The parameter types of the constructor.
1078 * @param thrown The thrown exceptions of the constructor.
1079 * @param based Is first parameter a this$n?
1080 */
1081 JCTree DefaultConstructor(TreeMaker make,
1082 ClassSymbol c,
1083 List<Type> typarams,
1084 List<Type> argtypes,
1085 List<Type> thrown,
1086 long flags,
1087 boolean based) {
1088 List<JCVariableDecl> params = make.Params(argtypes, syms.noSymbol);
1089 List<JCStatement> stats = List.nil();
1090 if (c.type != syms.objectType)
1091 stats = stats.prepend(SuperCall(make, typarams, params, based));
1092 if ((c.flags() & ENUM) != 0 &&
1093 (types.supertype(c.type).tsym == syms.enumSym ||
1094 target.compilerBootstrap(c))) {
1095 // constructors of true enums are private
1096 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
1097 } else
1098 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
1099 if (c.name.isEmpty()) flags |= ANONCONSTR;
1100 JCTree result = make.MethodDef(
1101 make.Modifiers(flags),
1102 names.init,
1103 null,
1104 make.TypeParams(typarams),
1105 params,
1106 make.Types(thrown),
1107 make.Block(0, stats),
1108 null);
1109 return result;
1110 }
1112 /** Generate call to superclass constructor. This is:
1113 *
1114 * super(id_0, ..., id_n)
1115 *
1116 * or, if based == true
1117 *
1118 * id_0.super(id_1,...,id_n)
1119 *
1120 * where id_0, ..., id_n are the names of the given parameters.
1121 *
1122 * @param make The tree factory
1123 * @param params The parameters that need to be passed to super
1124 * @param typarams The type parameters that need to be passed to super
1125 * @param based Is first parameter a this$n?
1126 */
1127 JCExpressionStatement SuperCall(TreeMaker make,
1128 List<Type> typarams,
1129 List<JCVariableDecl> params,
1130 boolean based) {
1131 JCExpression meth;
1132 if (based) {
1133 meth = make.Select(make.Ident(params.head), names._super);
1134 params = params.tail;
1135 } else {
1136 meth = make.Ident(names._super);
1137 }
1138 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
1139 return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
1140 }
1141 }
