Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@d17f37522154
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
Mon, 10 Jan 2011 14:57:59 -0800
- author
- jjg
- date
- Mon, 10 Jan 2011 14:57:59 -0800
- changeset 815
- d17f37522154
- parent 798
- 4868a36f6fd8
- child 816
- 7c537f4298fb
- permissions
- -rw-r--r--
6992999: fully remove JSR 308 from langtools
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 assert param.sym != null;
585 params.append(param.sym);
586 }
587 m.params = params.toList();
589 // mark the method varargs, if necessary
590 if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
591 m.flags_field |= Flags.VARARGS;
593 localEnv.info.scope.leave();
594 if (chk.checkUnique(tree.pos(), m, enclScope)) {
595 enclScope.enter(m);
596 }
597 annotateLater(tree.mods.annotations, localEnv, m);
598 if (tree.defaultValue != null)
599 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
600 }
602 /** Create a fresh environment for method bodies.
603 * @param tree The method definition.
604 * @param env The environment current outside of the method definition.
605 */
606 Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
607 Env<AttrContext> localEnv =
608 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
609 localEnv.enclMethod = tree;
610 localEnv.info.scope.owner = tree.sym;
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 attr.attribType(tree.vartype, localEnv);
623 if ((tree.mods.flags & VARARGS) != 0) {
624 //if we are entering a varargs parameter, we need to replace its type
625 //(a plain array type) with the more precise VarargsType --- we need
626 //to do it this way because varargs is represented in the tree as a modifier
627 //on the parameter declaration, and not as a distinct type of array node.
628 ArrayType atype = (ArrayType)tree.vartype.type;
629 tree.vartype.type = atype.makeVarargs();
630 }
631 Scope enclScope = enter.enterScope(env);
632 VarSymbol v =
633 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
634 v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
635 tree.sym = v;
636 if (tree.init != null) {
637 v.flags_field |= HASINIT;
638 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
639 Env<AttrContext> initEnv = getInitEnv(tree, env);
640 initEnv.info.enclVar = v;
641 v.setLazyConstValue(initEnv(tree, initEnv), log, attr, tree.init);
642 }
643 }
644 if (chk.checkUnique(tree.pos(), v, enclScope)) {
645 chk.checkTransparentVar(tree.pos(), v, enclScope);
646 enclScope.enter(v);
647 }
648 annotateLater(tree.mods.annotations, localEnv, v);
649 v.pos = tree.pos;
650 }
652 /** Create a fresh environment for a variable's initializer.
653 * If the variable is a field, the owner of the environment's scope
654 * is be the variable itself, otherwise the owner is the method
655 * enclosing the variable definition.
656 *
657 * @param tree The variable definition.
658 * @param env The environment current outside of the variable definition.
659 */
660 Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
661 Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
662 if (tree.sym.owner.kind == TYP) {
663 localEnv.info.scope = new Scope.DelegatedScope(env.info.scope);
664 localEnv.info.scope.owner = tree.sym;
665 }
666 if ((tree.mods.flags & STATIC) != 0 ||
667 (env.enclClass.sym.flags() & INTERFACE) != 0)
668 localEnv.info.staticLevel++;
669 return localEnv;
670 }
672 /** Default member enter visitor method: do nothing
673 */
674 public void visitTree(JCTree tree) {
675 }
677 public void visitErroneous(JCErroneous tree) {
678 if (tree.errs != null)
679 memberEnter(tree.errs, env);
680 }
682 public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
683 Env<AttrContext> mEnv = methodEnv(tree, env);
684 mEnv.info.lint = mEnv.info.lint.augment(tree.sym.attributes_field, tree.sym.flags());
685 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
686 mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
687 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
688 mEnv.info.scope.enterIfAbsent(l.head.sym);
689 return mEnv;
690 }
692 public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
693 Env<AttrContext> iEnv = initEnv(tree, env);
694 return iEnv;
695 }
697 /* ********************************************************************
698 * Type completion
699 *********************************************************************/
701 Type attribImportType(JCTree tree, Env<AttrContext> env) {
702 assert completionEnabled;
703 try {
704 // To prevent deep recursion, suppress completion of some
705 // types.
706 completionEnabled = false;
707 return attr.attribType(tree, env);
708 } finally {
709 completionEnabled = true;
710 }
711 }
713 /* ********************************************************************
714 * Annotation processing
715 *********************************************************************/
717 /** Queue annotations for later processing. */
718 void annotateLater(final List<JCAnnotation> annotations,
719 final Env<AttrContext> localEnv,
720 final Symbol s) {
721 if (annotations.isEmpty()) return;
722 if (s.kind != PCK) s.attributes_field = null; // mark it incomplete for now
723 annotate.later(new Annotate.Annotator() {
724 public String toString() {
725 return "annotate " + annotations + " onto " + s + " in " + s.owner;
726 }
727 public void enterAnnotation() {
728 assert s.kind == PCK || s.attributes_field == null;
729 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
730 try {
731 if (s.attributes_field != null &&
732 s.attributes_field.nonEmpty() &&
733 annotations.nonEmpty())
734 log.error(annotations.head.pos,
735 "already.annotated",
736 kindName(s), s);
737 enterAnnotations(annotations, localEnv, s);
738 } finally {
739 log.useSource(prev);
740 }
741 }
742 });
743 }
745 /**
746 * Check if a list of annotations contains a reference to
747 * java.lang.Deprecated.
748 **/
749 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
750 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
751 JCAnnotation a = al.head;
752 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
753 return true;
754 }
755 return false;
756 }
759 /** Enter a set of annotations. */
760 private void enterAnnotations(List<JCAnnotation> annotations,
761 Env<AttrContext> env,
762 Symbol s) {
763 ListBuffer<Attribute.Compound> buf =
764 new ListBuffer<Attribute.Compound>();
765 Set<TypeSymbol> annotated = new HashSet<TypeSymbol>();
766 if (!skipAnnotations)
767 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
768 JCAnnotation a = al.head;
769 Attribute.Compound c = annotate.enterAnnotation(a,
770 syms.annotationType,
771 env);
772 if (c == null) continue;
773 buf.append(c);
774 // Note: @Deprecated has no effect on local variables and parameters
775 if (!c.type.isErroneous()
776 && s.owner.kind != MTH
777 && types.isSameType(c.type, syms.deprecatedType))
778 s.flags_field |= Flags.DEPRECATED;
779 // Internally to java.dyn, a @PolymorphicSignature annotation
780 // acts like a classfile attribute.
781 if (!c.type.isErroneous() &&
782 types.isSameType(c.type, syms.polymorphicSignatureType)) {
783 if (!target.hasMethodHandles()) {
784 // Somebody is compiling JDK7 source code to a JDK6 target.
785 // Make it a strict warning, since it is unlikely but important.
786 log.strictWarning(env.tree.pos(),
787 "wrong.target.for.polymorphic.signature.definition",
788 target.name);
789 }
790 // Pull the flag through for better diagnostics, even on a bad target.
791 s.flags_field |= Flags.POLYMORPHIC_SIGNATURE;
792 }
793 if (!annotated.add(a.type.tsym))
794 log.error(a.pos, "duplicate.annotation");
795 }
796 s.attributes_field = buf.toList();
797 }
799 /** Queue processing of an attribute default value. */
800 void annotateDefaultValueLater(final JCExpression defaultValue,
801 final Env<AttrContext> localEnv,
802 final MethodSymbol m) {
803 annotate.later(new Annotate.Annotator() {
804 public String toString() {
805 return "annotate " + m.owner + "." +
806 m + " default " + defaultValue;
807 }
808 public void enterAnnotation() {
809 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
810 try {
811 enterDefaultValue(defaultValue, localEnv, m);
812 } finally {
813 log.useSource(prev);
814 }
815 }
816 });
817 }
819 /** Enter a default value for an attribute method. */
820 private void enterDefaultValue(final JCExpression defaultValue,
821 final Env<AttrContext> localEnv,
822 final MethodSymbol m) {
823 m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
824 defaultValue,
825 localEnv);
826 }
828 /* ********************************************************************
829 * Source completer
830 *********************************************************************/
832 /** Complete entering a class.
833 * @param sym The symbol of the class to be completed.
834 */
835 public void complete(Symbol sym) throws CompletionFailure {
836 // Suppress some (recursive) MemberEnter invocations
837 if (!completionEnabled) {
838 // Re-install same completer for next time around and return.
839 assert (sym.flags() & Flags.COMPOUND) == 0;
840 sym.completer = this;
841 return;
842 }
844 ClassSymbol c = (ClassSymbol)sym;
845 ClassType ct = (ClassType)c.type;
846 Env<AttrContext> env = enter.typeEnvs.get(c);
847 JCClassDecl tree = (JCClassDecl)env.tree;
848 boolean wasFirst = isFirst;
849 isFirst = false;
851 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
852 try {
853 // Save class environment for later member enter (2) processing.
854 halfcompleted.append(env);
856 // Mark class as not yet attributed.
857 c.flags_field |= UNATTRIBUTED;
859 // If this is a toplevel-class, make sure any preceding import
860 // clauses have been seen.
861 if (c.owner.kind == PCK) {
862 memberEnter(env.toplevel, env.enclosing(JCTree.TOPLEVEL));
863 todo.append(env);
864 }
866 if (c.owner.kind == TYP)
867 c.owner.complete();
869 // create an environment for evaluating the base clauses
870 Env<AttrContext> baseEnv = baseEnv(tree, env);
872 // Determine supertype.
873 Type supertype =
874 (tree.extending != null)
875 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
876 : ((tree.mods.flags & Flags.ENUM) != 0 && !target.compilerBootstrap(c))
877 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
878 true, false, false)
879 : (c.fullname == names.java_lang_Object)
880 ? Type.noType
881 : syms.objectType;
882 ct.supertype_field = supertype;
884 // Determine interfaces.
885 ListBuffer<Type> interfaces = new ListBuffer<Type>();
886 Set<Type> interfaceSet = new HashSet<Type>();
887 List<JCExpression> interfaceTrees = tree.implementing;
888 if ((tree.mods.flags & Flags.ENUM) != 0 && target.compilerBootstrap(c)) {
889 // add interface Comparable<T>
890 interfaceTrees =
891 interfaceTrees.prepend(make.Type(new ClassType(syms.comparableType.getEnclosingType(),
892 List.of(c.type),
893 syms.comparableType.tsym)));
894 // add interface Serializable
895 interfaceTrees =
896 interfaceTrees.prepend(make.Type(syms.serializableType));
897 }
898 for (JCExpression iface : interfaceTrees) {
899 Type i = attr.attribBase(iface, baseEnv, false, true, true);
900 if (i.tag == CLASS) {
901 interfaces.append(i);
902 chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
903 }
904 }
905 if ((c.flags_field & ANNOTATION) != 0)
906 ct.interfaces_field = List.of(syms.annotationType);
907 else
908 ct.interfaces_field = interfaces.toList();
910 if (c.fullname == names.java_lang_Object) {
911 if (tree.extending != null) {
912 chk.checkNonCyclic(tree.extending.pos(),
913 supertype);
914 ct.supertype_field = Type.noType;
915 }
916 else if (tree.implementing.nonEmpty()) {
917 chk.checkNonCyclic(tree.implementing.head.pos(),
918 ct.interfaces_field.head);
919 ct.interfaces_field = List.nil();
920 }
921 }
923 // Annotations.
924 // In general, we cannot fully process annotations yet, but we
925 // can attribute the annotation types and then check to see if the
926 // @Deprecated annotation is present.
927 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
928 if (hasDeprecatedAnnotation(tree.mods.annotations))
929 c.flags_field |= DEPRECATED;
930 annotateLater(tree.mods.annotations, baseEnv, c);
932 chk.checkNonCyclicDecl(tree);
934 attr.attribTypeVariables(tree.typarams, baseEnv);
936 // Add default constructor if needed.
937 if ((c.flags() & INTERFACE) == 0 &&
938 !TreeInfo.hasConstructors(tree.defs)) {
939 List<Type> argtypes = List.nil();
940 List<Type> typarams = List.nil();
941 List<Type> thrown = List.nil();
942 long ctorFlags = 0;
943 boolean based = false;
944 if (c.name.isEmpty()) {
945 JCNewClass nc = (JCNewClass)env.next.tree;
946 if (nc.constructor != null) {
947 Type superConstrType = types.memberType(c.type,
948 nc.constructor);
949 argtypes = superConstrType.getParameterTypes();
950 typarams = superConstrType.getTypeArguments();
951 ctorFlags = nc.constructor.flags() & VARARGS;
952 if (nc.encl != null) {
953 argtypes = argtypes.prepend(nc.encl.type);
954 based = true;
955 }
956 thrown = superConstrType.getThrownTypes();
957 }
958 }
959 JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
960 typarams, argtypes, thrown,
961 ctorFlags, based);
962 tree.defs = tree.defs.prepend(constrDef);
963 }
965 // If this is a class, enter symbols for this and super into
966 // current scope.
967 if ((c.flags_field & INTERFACE) == 0) {
968 VarSymbol thisSym =
969 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
970 thisSym.pos = Position.FIRSTPOS;
971 env.info.scope.enter(thisSym);
972 if (ct.supertype_field.tag == CLASS) {
973 VarSymbol superSym =
974 new VarSymbol(FINAL | HASINIT, names._super,
975 ct.supertype_field, c);
976 superSym.pos = Position.FIRSTPOS;
977 env.info.scope.enter(superSym);
978 }
979 }
981 // check that no package exists with same fully qualified name,
982 // but admit classes in the unnamed package which have the same
983 // name as a top-level package.
984 if (checkClash &&
985 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
986 reader.packageExists(c.fullname))
987 {
988 log.error(tree.pos, "clash.with.pkg.of.same.name", c);
989 }
991 } catch (CompletionFailure ex) {
992 chk.completionError(tree.pos(), ex);
993 } finally {
994 log.useSource(prev);
995 }
997 // Enter all member fields and methods of a set of half completed
998 // classes in a second phase.
999 if (wasFirst) {
1000 try {
1001 while (halfcompleted.nonEmpty()) {
1002 finish(halfcompleted.next());
1003 }
1004 } finally {
1005 isFirst = true;
1006 }
1008 // commit pending annotations
1009 annotate.flush();
1010 }
1011 }
1013 private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
1014 Scope baseScope = new Scope.ClassScope(tree.sym, scopeCounter);
1015 //import already entered local classes into base scope
1016 for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
1017 if (e.sym.isLocal()) {
1018 baseScope.enter(e.sym);
1019 }
1020 }
1021 //import current type-parameters into base scope
1022 if (tree.typarams != null)
1023 for (List<JCTypeParameter> typarams = tree.typarams;
1024 typarams.nonEmpty();
1025 typarams = typarams.tail)
1026 baseScope.enter(typarams.head.type.tsym);
1027 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
1028 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
1029 localEnv.baseClause = true;
1030 localEnv.outer = outer;
1031 localEnv.info.isSelfCall = false;
1032 return localEnv;
1033 }
1035 /** Enter member fields and methods of a class
1036 * @param env the environment current for the class block.
1037 */
1038 private void finish(Env<AttrContext> env) {
1039 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1040 try {
1041 JCClassDecl tree = (JCClassDecl)env.tree;
1042 finishClass(tree, env);
1043 } finally {
1044 log.useSource(prev);
1045 }
1046 }
1048 /** Generate a base clause for an enum type.
1049 * @param pos The position for trees and diagnostics, if any
1050 * @param c The class symbol of the enum
1051 */
1052 private JCExpression enumBase(int pos, ClassSymbol c) {
1053 JCExpression result = make.at(pos).
1054 TypeApply(make.QualIdent(syms.enumSym),
1055 List.<JCExpression>of(make.Type(c.type)));
1056 return result;
1057 }
1059 /* ***************************************************************************
1060 * tree building
1061 ****************************************************************************/
1063 /** Generate default constructor for given class. For classes different
1064 * from java.lang.Object, this is:
1065 *
1066 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1067 * super(x_0, ..., x_n)
1068 * }
1069 *
1070 * or, if based == true:
1071 *
1072 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1073 * x_0.super(x_1, ..., x_n)
1074 * }
1075 *
1076 * @param make The tree factory.
1077 * @param c The class owning the default constructor.
1078 * @param argtypes The parameter types of the constructor.
1079 * @param thrown The thrown exceptions of the constructor.
1080 * @param based Is first parameter a this$n?
1081 */
1082 JCTree DefaultConstructor(TreeMaker make,
1083 ClassSymbol c,
1084 List<Type> typarams,
1085 List<Type> argtypes,
1086 List<Type> thrown,
1087 long flags,
1088 boolean based) {
1089 List<JCVariableDecl> params = make.Params(argtypes, syms.noSymbol);
1090 List<JCStatement> stats = List.nil();
1091 if (c.type != syms.objectType)
1092 stats = stats.prepend(SuperCall(make, typarams, params, based));
1093 if ((c.flags() & ENUM) != 0 &&
1094 (types.supertype(c.type).tsym == syms.enumSym ||
1095 target.compilerBootstrap(c))) {
1096 // constructors of true enums are private
1097 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
1098 } else
1099 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
1100 if (c.name.isEmpty()) flags |= ANONCONSTR;
1101 JCTree result = make.MethodDef(
1102 make.Modifiers(flags),
1103 names.init,
1104 null,
1105 make.TypeParams(typarams),
1106 params,
1107 make.Types(thrown),
1108 make.Block(0, stats),
1109 null);
1110 return result;
1111 }
1113 /** Generate call to superclass constructor. This is:
1114 *
1115 * super(id_0, ..., id_n)
1116 *
1117 * or, if based == true
1118 *
1119 * id_0.super(id_1,...,id_n)
1120 *
1121 * where id_0, ..., id_n are the names of the given parameters.
1122 *
1123 * @param make The tree factory
1124 * @param params The parameters that need to be passed to super
1125 * @param typarams The type parameters that need to be passed to super
1126 * @param based Is first parameter a this$n?
1127 */
1128 JCExpressionStatement SuperCall(TreeMaker make,
1129 List<Type> typarams,
1130 List<JCVariableDecl> params,
1131 boolean based) {
1132 JCExpression meth;
1133 if (based) {
1134 meth = make.Select(make.Ident(params.head), names._super);
1135 params = params.tail;
1136 } else {
1137 meth = make.Ident(names._super);
1138 }
1139 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
1140 return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
1141 }
1142 }
