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src/share/classes/com/sun/tools/javac/comp/MemberEnter.java@2d75e7c952b8
src/share/classes/com/sun/tools/javac/comp/MemberEnter.java
Thu, 02 Aug 2012 18:24:01 +0100
- author
- mcimadamore
- date
- Thu, 02 Aug 2012 18:24:01 +0100
- changeset 1298
- 2d75e7c952b8
- parent 1270
- 844478076c25
- child 1313
- 873ddd9f4900
- permissions
- -rw-r--r--
7187104: Inference cleanup: remove redundant exception classes in Infer.java
Summary: Remove unused exception classes in Infer.java
Reviewed-by: jjg
1 /*
2 * Copyright (c) 2003, 2012, 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.Flags.ANNOTATION;
44 import static com.sun.tools.javac.code.Kinds.*;
45 import static com.sun.tools.javac.code.TypeTags.*;
46 import static com.sun.tools.javac.tree.JCTree.Tag.*;
47 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
48 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
50 /** This is the second phase of Enter, in which classes are completed
51 * by entering their members into the class scope using
52 * MemberEnter.complete(). See Enter for an overview.
53 *
54 * <p><b>This is NOT part of any supported API.
55 * If you write code that depends on this, you do so at your own risk.
56 * This code and its internal interfaces are subject to change or
57 * deletion without notice.</b>
58 */
59 public class MemberEnter extends JCTree.Visitor implements Completer {
60 protected static final Context.Key<MemberEnter> memberEnterKey =
61 new Context.Key<MemberEnter>();
63 /** A switch to determine whether we check for package/class conflicts
64 */
65 final static boolean checkClash = true;
67 private final Names names;
68 private final Enter enter;
69 private final Log log;
70 private final Check chk;
71 private final Attr attr;
72 private final Symtab syms;
73 private final TreeMaker make;
74 private final ClassReader reader;
75 private final Todo todo;
76 private final Annotate annotate;
77 private final Types types;
78 private final JCDiagnostic.Factory diags;
79 private final Target target;
80 private final DeferredLintHandler deferredLintHandler;
82 private final boolean skipAnnotations;
84 public static MemberEnter instance(Context context) {
85 MemberEnter instance = context.get(memberEnterKey);
86 if (instance == null)
87 instance = new MemberEnter(context);
88 return instance;
89 }
91 protected MemberEnter(Context context) {
92 context.put(memberEnterKey, this);
93 names = Names.instance(context);
94 enter = Enter.instance(context);
95 log = Log.instance(context);
96 chk = Check.instance(context);
97 attr = Attr.instance(context);
98 syms = Symtab.instance(context);
99 make = TreeMaker.instance(context);
100 reader = ClassReader.instance(context);
101 todo = Todo.instance(context);
102 annotate = Annotate.instance(context);
103 types = Types.instance(context);
104 diags = JCDiagnostic.Factory.instance(context);
105 target = Target.instance(context);
106 deferredLintHandler = DeferredLintHandler.instance(context);
107 Options options = Options.instance(context);
108 skipAnnotations = options.isSet("skipAnnotations");
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(DiagnosticFlag.RESOLVE_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(DiagnosticFlag.RECOVERABLE, 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 JCFieldAccess imp = (JCFieldAccess)tree.qualid;
533 Name name = TreeInfo.name(imp);
535 // Create a local environment pointing to this tree to disable
536 // effects of other imports in Resolve.findGlobalType
537 Env<AttrContext> localEnv = env.dup(tree);
539 TypeSymbol p = attr.attribImportQualifier(tree, localEnv).tsym;
540 if (name == names.asterisk) {
541 // Import on demand.
542 chk.checkCanonical(imp.selected);
543 if (tree.staticImport)
544 importStaticAll(tree.pos, p, env);
545 else
546 importAll(tree.pos, p, env);
547 } else {
548 // Named type import.
549 if (tree.staticImport) {
550 importNamedStatic(tree.pos(), p, name, localEnv);
551 chk.checkCanonical(imp.selected);
552 } else {
553 TypeSymbol c = attribImportType(imp, localEnv).tsym;
554 chk.checkCanonical(imp);
555 importNamed(tree.pos(), c, env);
556 }
557 }
558 }
560 public void visitMethodDef(JCMethodDecl tree) {
561 Scope enclScope = enter.enterScope(env);
562 MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
563 m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
564 tree.sym = m;
565 Env<AttrContext> localEnv = methodEnv(tree, env);
567 DeferredLintHandler prevLintHandler =
568 chk.setDeferredLintHandler(deferredLintHandler.setPos(tree.pos()));
569 try {
570 // Compute the method type
571 m.type = signature(tree.typarams, tree.params,
572 tree.restype, tree.thrown,
573 localEnv);
574 } finally {
575 chk.setDeferredLintHandler(prevLintHandler);
576 }
578 // Set m.params
579 ListBuffer<VarSymbol> params = new ListBuffer<VarSymbol>();
580 JCVariableDecl lastParam = null;
581 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
582 JCVariableDecl param = lastParam = l.head;
583 params.append(Assert.checkNonNull(param.sym));
584 }
585 m.params = params.toList();
587 // mark the method varargs, if necessary
588 if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0)
589 m.flags_field |= Flags.VARARGS;
591 localEnv.info.scope.leave();
592 if (chk.checkUnique(tree.pos(), m, enclScope)) {
593 enclScope.enter(m);
594 }
595 annotateLater(tree.mods.annotations, localEnv, m);
596 if (tree.defaultValue != null)
597 annotateDefaultValueLater(tree.defaultValue, localEnv, m);
598 }
600 /** Create a fresh environment for method bodies.
601 * @param tree The method definition.
602 * @param env The environment current outside of the method definition.
603 */
604 Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) {
605 Env<AttrContext> localEnv =
606 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
607 localEnv.enclMethod = tree;
608 localEnv.info.scope.owner = tree.sym;
609 if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++;
610 return localEnv;
611 }
613 public void visitVarDef(JCVariableDecl tree) {
614 Env<AttrContext> localEnv = env;
615 if ((tree.mods.flags & STATIC) != 0 ||
616 (env.info.scope.owner.flags() & INTERFACE) != 0) {
617 localEnv = env.dup(tree, env.info.dup());
618 localEnv.info.staticLevel++;
619 }
620 DeferredLintHandler prevLintHandler =
621 chk.setDeferredLintHandler(deferredLintHandler.setPos(tree.pos()));
622 try {
623 if (TreeInfo.isEnumInit(tree)) {
624 attr.attribIdentAsEnumType(localEnv, (JCIdent)tree.vartype);
625 } else {
626 attr.attribType(tree.vartype, localEnv);
627 }
628 } finally {
629 chk.setDeferredLintHandler(prevLintHandler);
630 }
632 if ((tree.mods.flags & VARARGS) != 0) {
633 //if we are entering a varargs parameter, we need to replace its type
634 //(a plain array type) with the more precise VarargsType --- we need
635 //to do it this way because varargs is represented in the tree as a modifier
636 //on the parameter declaration, and not as a distinct type of array node.
637 ArrayType atype = (ArrayType)tree.vartype.type;
638 tree.vartype.type = atype.makeVarargs();
639 }
640 Scope enclScope = enter.enterScope(env);
641 VarSymbol v =
642 new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner);
643 v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree);
644 tree.sym = v;
645 if (tree.init != null) {
646 v.flags_field |= HASINIT;
647 if ((v.flags_field & FINAL) != 0 && !tree.init.hasTag(NEWCLASS)) {
648 Env<AttrContext> initEnv = getInitEnv(tree, env);
649 initEnv.info.enclVar = v;
650 v.setLazyConstValue(initEnv(tree, initEnv), attr, tree.init);
651 }
652 }
653 if (chk.checkUnique(tree.pos(), v, enclScope)) {
654 chk.checkTransparentVar(tree.pos(), v, enclScope);
655 enclScope.enter(v);
656 }
657 annotateLater(tree.mods.annotations, localEnv, v);
658 v.pos = tree.pos;
659 }
661 /** Create a fresh environment for a variable's initializer.
662 * If the variable is a field, the owner of the environment's scope
663 * is be the variable itself, otherwise the owner is the method
664 * enclosing the variable definition.
665 *
666 * @param tree The variable definition.
667 * @param env The environment current outside of the variable definition.
668 */
669 Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) {
670 Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup()));
671 if (tree.sym.owner.kind == TYP) {
672 localEnv.info.scope = new Scope.DelegatedScope(env.info.scope);
673 localEnv.info.scope.owner = tree.sym;
674 }
675 if ((tree.mods.flags & STATIC) != 0 ||
676 (env.enclClass.sym.flags() & INTERFACE) != 0)
677 localEnv.info.staticLevel++;
678 return localEnv;
679 }
681 /** Default member enter visitor method: do nothing
682 */
683 public void visitTree(JCTree tree) {
684 }
686 public void visitErroneous(JCErroneous tree) {
687 if (tree.errs != null)
688 memberEnter(tree.errs, env);
689 }
691 public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) {
692 Env<AttrContext> mEnv = methodEnv(tree, env);
693 mEnv.info.lint = mEnv.info.lint.augment(tree.sym.attributes_field, tree.sym.flags());
694 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
695 mEnv.info.scope.enterIfAbsent(l.head.type.tsym);
696 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail)
697 mEnv.info.scope.enterIfAbsent(l.head.sym);
698 return mEnv;
699 }
701 public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) {
702 Env<AttrContext> iEnv = initEnv(tree, env);
703 return iEnv;
704 }
706 /* ********************************************************************
707 * Type completion
708 *********************************************************************/
710 Type attribImportType(JCTree tree, Env<AttrContext> env) {
711 Assert.check(completionEnabled);
712 try {
713 // To prevent deep recursion, suppress completion of some
714 // types.
715 completionEnabled = false;
716 return attr.attribType(tree, env);
717 } finally {
718 completionEnabled = true;
719 }
720 }
722 /* ********************************************************************
723 * Annotation processing
724 *********************************************************************/
726 /** Queue annotations for later processing. */
727 void annotateLater(final List<JCAnnotation> annotations,
728 final Env<AttrContext> localEnv,
729 final Symbol s) {
730 if (annotations.isEmpty()) return;
731 if (s.kind != PCK) s.attributes_field = null; // mark it incomplete for now
732 annotate.later(new Annotate.Annotator() {
733 public String toString() {
734 return "annotate " + annotations + " onto " + s + " in " + s.owner;
735 }
736 public void enterAnnotation() {
737 Assert.check(s.kind == PCK || s.attributes_field == null);
738 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
739 try {
740 if (s.attributes_field != null &&
741 s.attributes_field.nonEmpty() &&
742 annotations.nonEmpty())
743 log.error(annotations.head.pos,
744 "already.annotated",
745 kindName(s), s);
746 enterAnnotations(annotations, localEnv, s);
747 } finally {
748 log.useSource(prev);
749 }
750 }
751 });
752 }
754 /**
755 * Check if a list of annotations contains a reference to
756 * java.lang.Deprecated.
757 **/
758 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) {
759 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
760 JCAnnotation a = al.head;
761 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty())
762 return true;
763 }
764 return false;
765 }
768 /** Enter a set of annotations. */
769 private void enterAnnotations(List<JCAnnotation> annotations,
770 Env<AttrContext> env,
771 Symbol s) {
772 ListBuffer<Attribute.Compound> buf =
773 new ListBuffer<Attribute.Compound>();
774 Set<TypeSymbol> annotated = new HashSet<TypeSymbol>();
775 if (!skipAnnotations)
776 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
777 JCAnnotation a = al.head;
778 Attribute.Compound c = annotate.enterAnnotation(a,
779 syms.annotationType,
780 env);
781 if (c == null) continue;
782 buf.append(c);
783 // Note: @Deprecated has no effect on local variables and parameters
784 if (!c.type.isErroneous()
785 && s.owner.kind != MTH
786 && types.isSameType(c.type, syms.deprecatedType))
787 s.flags_field |= Flags.DEPRECATED;
788 if (!annotated.add(a.type.tsym))
789 log.error(a.pos, "duplicate.annotation");
790 }
791 s.attributes_field = buf.toList();
792 }
794 /** Queue processing of an attribute default value. */
795 void annotateDefaultValueLater(final JCExpression defaultValue,
796 final Env<AttrContext> localEnv,
797 final MethodSymbol m) {
798 annotate.later(new Annotate.Annotator() {
799 public String toString() {
800 return "annotate " + m.owner + "." +
801 m + " default " + defaultValue;
802 }
803 public void enterAnnotation() {
804 JavaFileObject prev = log.useSource(localEnv.toplevel.sourcefile);
805 try {
806 enterDefaultValue(defaultValue, localEnv, m);
807 } finally {
808 log.useSource(prev);
809 }
810 }
811 });
812 }
814 /** Enter a default value for an attribute method. */
815 private void enterDefaultValue(final JCExpression defaultValue,
816 final Env<AttrContext> localEnv,
817 final MethodSymbol m) {
818 m.defaultValue = annotate.enterAttributeValue(m.type.getReturnType(),
819 defaultValue,
820 localEnv);
821 }
823 /* ********************************************************************
824 * Source completer
825 *********************************************************************/
827 /** Complete entering a class.
828 * @param sym The symbol of the class to be completed.
829 */
830 public void complete(Symbol sym) throws CompletionFailure {
831 // Suppress some (recursive) MemberEnter invocations
832 if (!completionEnabled) {
833 // Re-install same completer for next time around and return.
834 Assert.check((sym.flags() & Flags.COMPOUND) == 0);
835 sym.completer = this;
836 return;
837 }
839 ClassSymbol c = (ClassSymbol)sym;
840 ClassType ct = (ClassType)c.type;
841 Env<AttrContext> env = enter.typeEnvs.get(c);
842 JCClassDecl tree = (JCClassDecl)env.tree;
843 boolean wasFirst = isFirst;
844 isFirst = false;
846 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
847 try {
848 // Save class environment for later member enter (2) processing.
849 halfcompleted.append(env);
851 // Mark class as not yet attributed.
852 c.flags_field |= UNATTRIBUTED;
854 // If this is a toplevel-class, make sure any preceding import
855 // clauses have been seen.
856 if (c.owner.kind == PCK) {
857 memberEnter(env.toplevel, env.enclosing(TOPLEVEL));
858 todo.append(env);
859 }
861 if (c.owner.kind == TYP)
862 c.owner.complete();
864 // create an environment for evaluating the base clauses
865 Env<AttrContext> baseEnv = baseEnv(tree, env);
867 // Determine supertype.
868 Type supertype =
869 (tree.extending != null)
870 ? attr.attribBase(tree.extending, baseEnv, true, false, true)
871 : ((tree.mods.flags & Flags.ENUM) != 0 && !target.compilerBootstrap(c))
872 ? attr.attribBase(enumBase(tree.pos, c), baseEnv,
873 true, false, false)
874 : (c.fullname == names.java_lang_Object)
875 ? Type.noType
876 : syms.objectType;
877 ct.supertype_field = modelMissingTypes(supertype, tree.extending, false);
879 // Determine interfaces.
880 ListBuffer<Type> interfaces = new ListBuffer<Type>();
881 ListBuffer<Type> all_interfaces = null; // lazy init
882 Set<Type> interfaceSet = new HashSet<Type>();
883 List<JCExpression> interfaceTrees = tree.implementing;
884 if ((tree.mods.flags & Flags.ENUM) != 0 && target.compilerBootstrap(c)) {
885 // add interface Comparable<T>
886 interfaceTrees =
887 interfaceTrees.prepend(make.Type(new ClassType(syms.comparableType.getEnclosingType(),
888 List.of(c.type),
889 syms.comparableType.tsym)));
890 // add interface Serializable
891 interfaceTrees =
892 interfaceTrees.prepend(make.Type(syms.serializableType));
893 }
894 for (JCExpression iface : interfaceTrees) {
895 Type i = attr.attribBase(iface, baseEnv, false, true, true);
896 if (i.tag == CLASS) {
897 interfaces.append(i);
898 if (all_interfaces != null) all_interfaces.append(i);
899 chk.checkNotRepeated(iface.pos(), types.erasure(i), interfaceSet);
900 } else {
901 if (all_interfaces == null)
902 all_interfaces = new ListBuffer<Type>().appendList(interfaces);
903 all_interfaces.append(modelMissingTypes(i, iface, true));
904 }
905 }
906 if ((c.flags_field & ANNOTATION) != 0) {
907 ct.interfaces_field = List.of(syms.annotationType);
908 ct.all_interfaces_field = ct.interfaces_field;
909 } else {
910 ct.interfaces_field = interfaces.toList();
911 ct.all_interfaces_field = (all_interfaces == null)
912 ? ct.interfaces_field : all_interfaces.toList();
913 }
915 if (c.fullname == names.java_lang_Object) {
916 if (tree.extending != null) {
917 chk.checkNonCyclic(tree.extending.pos(),
918 supertype);
919 ct.supertype_field = Type.noType;
920 }
921 else if (tree.implementing.nonEmpty()) {
922 chk.checkNonCyclic(tree.implementing.head.pos(),
923 ct.interfaces_field.head);
924 ct.interfaces_field = List.nil();
925 }
926 }
928 // Annotations.
929 // In general, we cannot fully process annotations yet, but we
930 // can attribute the annotation types and then check to see if the
931 // @Deprecated annotation is present.
932 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv);
933 if (hasDeprecatedAnnotation(tree.mods.annotations))
934 c.flags_field |= DEPRECATED;
935 annotateLater(tree.mods.annotations, baseEnv, c);
937 chk.checkNonCyclicDecl(tree);
939 attr.attribTypeVariables(tree.typarams, baseEnv);
941 // Add default constructor if needed.
942 if ((c.flags() & INTERFACE) == 0 &&
943 !TreeInfo.hasConstructors(tree.defs)) {
944 List<Type> argtypes = List.nil();
945 List<Type> typarams = List.nil();
946 List<Type> thrown = List.nil();
947 long ctorFlags = 0;
948 boolean based = false;
949 if (c.name.isEmpty()) {
950 JCNewClass nc = (JCNewClass)env.next.tree;
951 if (nc.constructor != null) {
952 Type superConstrType = types.memberType(c.type,
953 nc.constructor);
954 argtypes = superConstrType.getParameterTypes();
955 typarams = superConstrType.getTypeArguments();
956 ctorFlags = nc.constructor.flags() & VARARGS;
957 if (nc.encl != null) {
958 argtypes = argtypes.prepend(nc.encl.type);
959 based = true;
960 }
961 thrown = superConstrType.getThrownTypes();
962 }
963 }
964 JCTree constrDef = DefaultConstructor(make.at(tree.pos), c,
965 typarams, argtypes, thrown,
966 ctorFlags, based);
967 tree.defs = tree.defs.prepend(constrDef);
968 }
970 // If this is a class, enter symbols for this and super into
971 // current scope.
972 if ((c.flags_field & INTERFACE) == 0) {
973 VarSymbol thisSym =
974 new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
975 thisSym.pos = Position.FIRSTPOS;
976 env.info.scope.enter(thisSym);
977 if (ct.supertype_field.tag == CLASS) {
978 VarSymbol superSym =
979 new VarSymbol(FINAL | HASINIT, names._super,
980 ct.supertype_field, c);
981 superSym.pos = Position.FIRSTPOS;
982 env.info.scope.enter(superSym);
983 }
984 }
986 // check that no package exists with same fully qualified name,
987 // but admit classes in the unnamed package which have the same
988 // name as a top-level package.
989 if (checkClash &&
990 c.owner.kind == PCK && c.owner != syms.unnamedPackage &&
991 reader.packageExists(c.fullname))
992 {
993 log.error(tree.pos, "clash.with.pkg.of.same.name", Kinds.kindName(sym), c);
994 }
996 } catch (CompletionFailure ex) {
997 chk.completionError(tree.pos(), ex);
998 } finally {
999 log.useSource(prev);
1000 }
1002 // Enter all member fields and methods of a set of half completed
1003 // classes in a second phase.
1004 if (wasFirst) {
1005 try {
1006 while (halfcompleted.nonEmpty()) {
1007 finish(halfcompleted.next());
1008 }
1009 } finally {
1010 isFirst = true;
1011 }
1013 // commit pending annotations
1014 annotate.flush();
1015 }
1016 }
1018 private Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) {
1019 Scope baseScope = new Scope(tree.sym);
1020 //import already entered local classes into base scope
1021 for (Scope.Entry e = env.outer.info.scope.elems ; e != null ; e = e.sibling) {
1022 if (e.sym.isLocal()) {
1023 baseScope.enter(e.sym);
1024 }
1025 }
1026 //import current type-parameters into base scope
1027 if (tree.typarams != null)
1028 for (List<JCTypeParameter> typarams = tree.typarams;
1029 typarams.nonEmpty();
1030 typarams = typarams.tail)
1031 baseScope.enter(typarams.head.type.tsym);
1032 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class
1033 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope));
1034 localEnv.baseClause = true;
1035 localEnv.outer = outer;
1036 localEnv.info.isSelfCall = false;
1037 return localEnv;
1038 }
1040 /** Enter member fields and methods of a class
1041 * @param env the environment current for the class block.
1042 */
1043 private void finish(Env<AttrContext> env) {
1044 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
1045 try {
1046 JCClassDecl tree = (JCClassDecl)env.tree;
1047 finishClass(tree, env);
1048 } finally {
1049 log.useSource(prev);
1050 }
1051 }
1053 /** Generate a base clause for an enum type.
1054 * @param pos The position for trees and diagnostics, if any
1055 * @param c The class symbol of the enum
1056 */
1057 private JCExpression enumBase(int pos, ClassSymbol c) {
1058 JCExpression result = make.at(pos).
1059 TypeApply(make.QualIdent(syms.enumSym),
1060 List.<JCExpression>of(make.Type(c.type)));
1061 return result;
1062 }
1064 Type modelMissingTypes(Type t, final JCExpression tree, final boolean interfaceExpected) {
1065 if (t.tag != ERROR)
1066 return t;
1068 return new ErrorType(((ErrorType) t).getOriginalType(), t.tsym) {
1069 private Type modelType;
1071 @Override
1072 public Type getModelType() {
1073 if (modelType == null)
1074 modelType = new Synthesizer(getOriginalType(), interfaceExpected).visit(tree);
1075 return modelType;
1076 }
1077 };
1078 }
1079 // where
1080 private class Synthesizer extends JCTree.Visitor {
1081 Type originalType;
1082 boolean interfaceExpected;
1083 List<ClassSymbol> synthesizedSymbols = List.nil();
1084 Type result;
1086 Synthesizer(Type originalType, boolean interfaceExpected) {
1087 this.originalType = originalType;
1088 this.interfaceExpected = interfaceExpected;
1089 }
1091 Type visit(JCTree tree) {
1092 tree.accept(this);
1093 return result;
1094 }
1096 List<Type> visit(List<? extends JCTree> trees) {
1097 ListBuffer<Type> lb = new ListBuffer<Type>();
1098 for (JCTree t: trees)
1099 lb.append(visit(t));
1100 return lb.toList();
1101 }
1103 @Override
1104 public void visitTree(JCTree tree) {
1105 result = syms.errType;
1106 }
1108 @Override
1109 public void visitIdent(JCIdent tree) {
1110 if (tree.type.tag != ERROR) {
1111 result = tree.type;
1112 } else {
1113 result = synthesizeClass(tree.name, syms.unnamedPackage).type;
1114 }
1115 }
1117 @Override
1118 public void visitSelect(JCFieldAccess tree) {
1119 if (tree.type.tag != ERROR) {
1120 result = tree.type;
1121 } else {
1122 Type selectedType;
1123 boolean prev = interfaceExpected;
1124 try {
1125 interfaceExpected = false;
1126 selectedType = visit(tree.selected);
1127 } finally {
1128 interfaceExpected = prev;
1129 }
1130 ClassSymbol c = synthesizeClass(tree.name, selectedType.tsym);
1131 result = c.type;
1132 }
1133 }
1135 @Override
1136 public void visitTypeApply(JCTypeApply tree) {
1137 if (tree.type.tag != ERROR) {
1138 result = tree.type;
1139 } else {
1140 ClassType clazzType = (ClassType) visit(tree.clazz);
1141 if (synthesizedSymbols.contains(clazzType.tsym))
1142 synthesizeTyparams((ClassSymbol) clazzType.tsym, tree.arguments.size());
1143 final List<Type> actuals = visit(tree.arguments);
1144 result = new ErrorType(tree.type, clazzType.tsym) {
1145 @Override
1146 public List<Type> getTypeArguments() {
1147 return actuals;
1148 }
1149 };
1150 }
1151 }
1153 ClassSymbol synthesizeClass(Name name, Symbol owner) {
1154 int flags = interfaceExpected ? INTERFACE : 0;
1155 ClassSymbol c = new ClassSymbol(flags, name, owner);
1156 c.members_field = new Scope.ErrorScope(c);
1157 c.type = new ErrorType(originalType, c) {
1158 @Override
1159 public List<Type> getTypeArguments() {
1160 return typarams_field;
1161 }
1162 };
1163 synthesizedSymbols = synthesizedSymbols.prepend(c);
1164 return c;
1165 }
1167 void synthesizeTyparams(ClassSymbol sym, int n) {
1168 ClassType ct = (ClassType) sym.type;
1169 Assert.check(ct.typarams_field.isEmpty());
1170 if (n == 1) {
1171 TypeVar v = new TypeVar(names.fromString("T"), sym, syms.botType);
1172 ct.typarams_field = ct.typarams_field.prepend(v);
1173 } else {
1174 for (int i = n; i > 0; i--) {
1175 TypeVar v = new TypeVar(names.fromString("T" + i), sym, syms.botType);
1176 ct.typarams_field = ct.typarams_field.prepend(v);
1177 }
1178 }
1179 }
1180 }
1183 /* ***************************************************************************
1184 * tree building
1185 ****************************************************************************/
1187 /** Generate default constructor for given class. For classes different
1188 * from java.lang.Object, this is:
1189 *
1190 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1191 * super(x_0, ..., x_n)
1192 * }
1193 *
1194 * or, if based == true:
1195 *
1196 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown {
1197 * x_0.super(x_1, ..., x_n)
1198 * }
1199 *
1200 * @param make The tree factory.
1201 * @param c The class owning the default constructor.
1202 * @param argtypes The parameter types of the constructor.
1203 * @param thrown The thrown exceptions of the constructor.
1204 * @param based Is first parameter a this$n?
1205 */
1206 JCTree DefaultConstructor(TreeMaker make,
1207 ClassSymbol c,
1208 List<Type> typarams,
1209 List<Type> argtypes,
1210 List<Type> thrown,
1211 long flags,
1212 boolean based) {
1213 List<JCVariableDecl> params = make.Params(argtypes, syms.noSymbol);
1214 List<JCStatement> stats = List.nil();
1215 if (c.type != syms.objectType)
1216 stats = stats.prepend(SuperCall(make, typarams, params, based));
1217 if ((c.flags() & ENUM) != 0 &&
1218 (types.supertype(c.type).tsym == syms.enumSym ||
1219 target.compilerBootstrap(c))) {
1220 // constructors of true enums are private
1221 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR;
1222 } else
1223 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR;
1224 if (c.name.isEmpty()) flags |= ANONCONSTR;
1225 JCTree result = make.MethodDef(
1226 make.Modifiers(flags),
1227 names.init,
1228 null,
1229 make.TypeParams(typarams),
1230 params,
1231 make.Types(thrown),
1232 make.Block(0, stats),
1233 null);
1234 return result;
1235 }
1237 /** Generate call to superclass constructor. This is:
1238 *
1239 * super(id_0, ..., id_n)
1240 *
1241 * or, if based == true
1242 *
1243 * id_0.super(id_1,...,id_n)
1244 *
1245 * where id_0, ..., id_n are the names of the given parameters.
1246 *
1247 * @param make The tree factory
1248 * @param params The parameters that need to be passed to super
1249 * @param typarams The type parameters that need to be passed to super
1250 * @param based Is first parameter a this$n?
1251 */
1252 JCExpressionStatement SuperCall(TreeMaker make,
1253 List<Type> typarams,
1254 List<JCVariableDecl> params,
1255 boolean based) {
1256 JCExpression meth;
1257 if (based) {
1258 meth = make.Select(make.Ident(params.head), names._super);
1259 params = params.tail;
1260 } else {
1261 meth = make.Ident(names._super);
1262 }
1263 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null;
1264 return make.Exec(make.Apply(typeargs, meth, make.Idents(params)));
1265 }
1266 }
