Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/TransTypes.java@c75be5bc5283
src/share/classes/com/sun/tools/javac/comp/TransTypes.java
Tue, 09 Oct 2012 19:10:00 -0700
- author
- jjg
- date
- Tue, 09 Oct 2012 19:10:00 -0700
- changeset 1357
- c75be5bc5283
- parent 1352
- d4b3cb1ece84
- child 1358
- fc123bdeddb8
- permissions
- -rw-r--r--
8000663: clean up langtools imports
Reviewed-by: darcy
1 /*
2 * Copyright (c) 1999, 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.*;
30 import com.sun.tools.javac.code.*;
31 import com.sun.tools.javac.code.Symbol.*;
32 import com.sun.tools.javac.tree.*;
33 import com.sun.tools.javac.tree.JCTree.*;
34 import com.sun.tools.javac.util.*;
35 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
36 import com.sun.tools.javac.util.List;
38 import static com.sun.tools.javac.code.Flags.*;
39 import static com.sun.tools.javac.code.Kinds.*;
40 import static com.sun.tools.javac.code.TypeTags.*;
42 /** This pass translates Generic Java to conventional Java.
43 *
44 * <p><b>This is NOT part of any supported API.
45 * If you write code that depends on this, you do so at your own risk.
46 * This code and its internal interfaces are subject to change or
47 * deletion without notice.</b>
48 */
49 public class TransTypes extends TreeTranslator {
50 /** The context key for the TransTypes phase. */
51 protected static final Context.Key<TransTypes> transTypesKey =
52 new Context.Key<TransTypes>();
54 /** Get the instance for this context. */
55 public static TransTypes instance(Context context) {
56 TransTypes instance = context.get(transTypesKey);
57 if (instance == null)
58 instance = new TransTypes(context);
59 return instance;
60 }
62 private Names names;
63 private Log log;
64 private Symtab syms;
65 private TreeMaker make;
66 private Enter enter;
67 private boolean allowEnums;
68 private Types types;
69 private final Resolve resolve;
71 /**
72 * Flag to indicate whether or not to generate bridge methods.
73 * For pre-Tiger source there is no need for bridge methods, so it
74 * can be skipped to get better performance for -source 1.4 etc.
75 */
76 private final boolean addBridges;
78 protected TransTypes(Context context) {
79 context.put(transTypesKey, this);
80 names = Names.instance(context);
81 log = Log.instance(context);
82 syms = Symtab.instance(context);
83 enter = Enter.instance(context);
84 overridden = new HashMap<MethodSymbol,MethodSymbol>();
85 Source source = Source.instance(context);
86 allowEnums = source.allowEnums();
87 addBridges = source.addBridges();
88 types = Types.instance(context);
89 make = TreeMaker.instance(context);
90 resolve = Resolve.instance(context);
91 }
93 /** A hashtable mapping bridge methods to the methods they override after
94 * type erasure.
95 */
96 Map<MethodSymbol,MethodSymbol> overridden;
98 /** Construct an attributed tree for a cast of expression to target type,
99 * unless it already has precisely that type.
100 * @param tree The expression tree.
101 * @param target The target type.
102 */
103 JCExpression cast(JCExpression tree, Type target) {
104 int oldpos = make.pos;
105 make.at(tree.pos);
106 if (!types.isSameType(tree.type, target)) {
107 if (!resolve.isAccessible(env, target.tsym))
108 resolve.logAccessErrorInternal(env, tree, target);
109 tree = make.TypeCast(make.Type(target), tree).setType(target);
110 }
111 make.pos = oldpos;
112 return tree;
113 }
115 /** Construct an attributed tree to coerce an expression to some erased
116 * target type, unless the expression is already assignable to that type.
117 * If target type is a constant type, use its base type instead.
118 * @param tree The expression tree.
119 * @param target The target type.
120 */
121 JCExpression coerce(JCExpression tree, Type target) {
122 Type btarget = target.baseType();
123 if (tree.type.isPrimitive() == target.isPrimitive()) {
124 return types.isAssignable(tree.type, btarget, Warner.noWarnings)
125 ? tree
126 : cast(tree, btarget);
127 }
128 return tree;
129 }
131 /** Given an erased reference type, assume this type as the tree's type.
132 * Then, coerce to some given target type unless target type is null.
133 * This operation is used in situations like the following:
134 *
135 * class Cell<A> { A value; }
136 * ...
137 * Cell<Integer> cell;
138 * Integer x = cell.value;
139 *
140 * Since the erasure of Cell.value is Object, but the type
141 * of cell.value in the assignment is Integer, we need to
142 * adjust the original type of cell.value to Object, and insert
143 * a cast to Integer. That is, the last assignment becomes:
144 *
145 * Integer x = (Integer)cell.value;
146 *
147 * @param tree The expression tree whose type might need adjustment.
148 * @param erasedType The expression's type after erasure.
149 * @param target The target type, which is usually the erasure of the
150 * expression's original type.
151 */
152 JCExpression retype(JCExpression tree, Type erasedType, Type target) {
153 // System.err.println("retype " + tree + " to " + erasedType);//DEBUG
154 if (erasedType.tag > lastBaseTag) {
155 if (target != null && target.isPrimitive())
156 target = erasure(tree.type);
157 tree.type = erasedType;
158 if (target != null) return coerce(tree, target);
159 }
160 return tree;
161 }
163 /** Translate method argument list, casting each argument
164 * to its corresponding type in a list of target types.
165 * @param _args The method argument list.
166 * @param parameters The list of target types.
167 * @param varargsElement The erasure of the varargs element type,
168 * or null if translating a non-varargs invocation
169 */
170 <T extends JCTree> List<T> translateArgs(List<T> _args,
171 List<Type> parameters,
172 Type varargsElement) {
173 if (parameters.isEmpty()) return _args;
174 List<T> args = _args;
175 while (parameters.tail.nonEmpty()) {
176 args.head = translate(args.head, parameters.head);
177 args = args.tail;
178 parameters = parameters.tail;
179 }
180 Type parameter = parameters.head;
181 Assert.check(varargsElement != null || args.length() == 1);
182 if (varargsElement != null) {
183 while (args.nonEmpty()) {
184 args.head = translate(args.head, varargsElement);
185 args = args.tail;
186 }
187 } else {
188 args.head = translate(args.head, parameter);
189 }
190 return _args;
191 }
193 /** Add a bridge definition and enter corresponding method symbol in
194 * local scope of origin.
195 *
196 * @param pos The source code position to be used for the definition.
197 * @param meth The method for which a bridge needs to be added
198 * @param impl That method's implementation (possibly the method itself)
199 * @param origin The class to which the bridge will be added
200 * @param hypothetical
201 * True if the bridge method is not strictly necessary in the
202 * binary, but is represented in the symbol table to detect
203 * erasure clashes.
204 * @param bridges The list buffer to which the bridge will be added
205 */
206 void addBridge(DiagnosticPosition pos,
207 MethodSymbol meth,
208 MethodSymbol impl,
209 ClassSymbol origin,
210 boolean hypothetical,
211 ListBuffer<JCTree> bridges) {
212 make.at(pos);
213 Type origType = types.memberType(origin.type, meth);
214 Type origErasure = erasure(origType);
216 // Create a bridge method symbol and a bridge definition without a body.
217 Type bridgeType = meth.erasure(types);
218 long flags = impl.flags() & AccessFlags | SYNTHETIC | BRIDGE;
219 if (hypothetical) flags |= HYPOTHETICAL;
220 MethodSymbol bridge = new MethodSymbol(flags,
221 meth.name,
222 bridgeType,
223 origin);
224 if (!hypothetical) {
225 JCMethodDecl md = make.MethodDef(bridge, null);
227 // The bridge calls this.impl(..), if we have an implementation
228 // in the current class, super.impl(...) otherwise.
229 JCExpression receiver = (impl.owner == origin)
230 ? make.This(origin.erasure(types))
231 : make.Super(types.supertype(origin.type).tsym.erasure(types), origin);
233 // The type returned from the original method.
234 Type calltype = erasure(impl.type.getReturnType());
236 // Construct a call of this.impl(params), or super.impl(params),
237 // casting params and possibly results as needed.
238 JCExpression call =
239 make.Apply(
240 null,
241 make.Select(receiver, impl).setType(calltype),
242 translateArgs(make.Idents(md.params), origErasure.getParameterTypes(), null))
243 .setType(calltype);
244 JCStatement stat = (origErasure.getReturnType().tag == VOID)
245 ? make.Exec(call)
246 : make.Return(coerce(call, bridgeType.getReturnType()));
247 md.body = make.Block(0, List.of(stat));
249 // Add bridge to `bridges' buffer
250 bridges.append(md);
251 }
253 // Add bridge to scope of enclosing class and `overridden' table.
254 origin.members().enter(bridge);
255 overridden.put(bridge, meth);
256 }
258 /** Add bridge if given symbol is a non-private, non-static member
259 * of the given class, which is either defined in the class or non-final
260 * inherited, and one of the two following conditions holds:
261 * 1. The method's type changes in the given class, as compared to the
262 * class where the symbol was defined, (in this case
263 * we have extended a parameterized class with non-trivial parameters).
264 * 2. The method has an implementation with a different erased return type.
265 * (in this case we have used co-variant returns).
266 * If a bridge already exists in some other class, no new bridge is added.
267 * Instead, it is checked that the bridge symbol overrides the method symbol.
268 * (Spec ???).
269 * todo: what about bridges for privates???
270 *
271 * @param pos The source code position to be used for the definition.
272 * @param sym The symbol for which a bridge might have to be added.
273 * @param origin The class in which the bridge would go.
274 * @param bridges The list buffer to which the bridge would be added.
275 */
276 void addBridgeIfNeeded(DiagnosticPosition pos,
277 Symbol sym,
278 ClassSymbol origin,
279 ListBuffer<JCTree> bridges) {
280 if (sym.kind == MTH &&
281 sym.name != names.init &&
282 (sym.flags() & (PRIVATE | STATIC)) == 0 &&
283 (sym.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) != SYNTHETIC &&
284 sym.isMemberOf(origin, types))
285 {
286 MethodSymbol meth = (MethodSymbol)sym;
287 MethodSymbol bridge = meth.binaryImplementation(origin, types);
288 MethodSymbol impl = meth.implementation(origin, types, true, overrideBridgeFilter);
289 if (bridge == null ||
290 bridge == meth ||
291 (impl != null && !bridge.owner.isSubClass(impl.owner, types))) {
292 // No bridge was added yet.
293 if (impl != null && isBridgeNeeded(meth, impl, origin.type)) {
294 addBridge(pos, meth, impl, origin, bridge==impl, bridges);
295 } else if (impl == meth
296 && impl.owner != origin
297 && (impl.flags() & FINAL) == 0
298 && (meth.flags() & (ABSTRACT|PUBLIC)) == PUBLIC
299 && (origin.flags() & PUBLIC) > (impl.owner.flags() & PUBLIC)) {
300 // this is to work around a horrible but permanent
301 // reflection design error.
302 addBridge(pos, meth, impl, origin, false, bridges);
303 }
304 } else if ((bridge.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) == SYNTHETIC) {
305 MethodSymbol other = overridden.get(bridge);
306 if (other != null && other != meth) {
307 if (impl == null || !impl.overrides(other, origin, types, true)) {
308 // Bridge for other symbol pair was added
309 log.error(pos, "name.clash.same.erasure.no.override",
310 other, other.location(origin.type, types),
311 meth, meth.location(origin.type, types));
312 }
313 }
314 } else if (!bridge.overrides(meth, origin, types, true)) {
315 // Accidental binary override without source override.
316 if (bridge.owner == origin ||
317 types.asSuper(bridge.owner.type, meth.owner) == null)
318 // Don't diagnose the problem if it would already
319 // have been reported in the superclass
320 log.error(pos, "name.clash.same.erasure.no.override",
321 bridge, bridge.location(origin.type, types),
322 meth, meth.location(origin.type, types));
323 }
324 }
325 }
326 // where
327 Filter<Symbol> overrideBridgeFilter = new Filter<Symbol>() {
328 public boolean accepts(Symbol s) {
329 return (s.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) != SYNTHETIC;
330 }
331 };
332 /**
333 * @param method The symbol for which a bridge might have to be added
334 * @param impl The implementation of method
335 * @param dest The type in which the bridge would go
336 */
337 private boolean isBridgeNeeded(MethodSymbol method,
338 MethodSymbol impl,
339 Type dest) {
340 if (impl != method) {
341 // If either method or impl have different erasures as
342 // members of dest, a bridge is needed.
343 Type method_erasure = method.erasure(types);
344 if (!isSameMemberWhenErased(dest, method, method_erasure))
345 return true;
346 Type impl_erasure = impl.erasure(types);
347 if (!isSameMemberWhenErased(dest, impl, impl_erasure))
348 return true;
350 // If the erasure of the return type is different, a
351 // bridge is needed.
352 return !types.isSameType(impl_erasure.getReturnType(),
353 method_erasure.getReturnType());
354 } else {
355 // method and impl are the same...
356 if ((method.flags() & ABSTRACT) != 0) {
357 // ...and abstract so a bridge is not needed.
358 // Concrete subclasses will bridge as needed.
359 return false;
360 }
362 // The erasure of the return type is always the same
363 // for the same symbol. Reducing the three tests in
364 // the other branch to just one:
365 return !isSameMemberWhenErased(dest, method, method.erasure(types));
366 }
367 }
368 /**
369 * Lookup the method as a member of the type. Compare the
370 * erasures.
371 * @param type the class where to look for the method
372 * @param method the method to look for in class
373 * @param erasure the erasure of method
374 */
375 private boolean isSameMemberWhenErased(Type type,
376 MethodSymbol method,
377 Type erasure) {
378 return types.isSameType(erasure(types.memberType(type, method)),
379 erasure);
380 }
382 void addBridges(DiagnosticPosition pos,
383 TypeSymbol i,
384 ClassSymbol origin,
385 ListBuffer<JCTree> bridges) {
386 for (Scope.Entry e = i.members().elems; e != null; e = e.sibling)
387 addBridgeIfNeeded(pos, e.sym, origin, bridges);
388 for (List<Type> l = types.interfaces(i.type); l.nonEmpty(); l = l.tail)
389 addBridges(pos, l.head.tsym, origin, bridges);
390 }
392 /** Add all necessary bridges to some class appending them to list buffer.
393 * @param pos The source code position to be used for the bridges.
394 * @param origin The class in which the bridges go.
395 * @param bridges The list buffer to which the bridges are added.
396 */
397 void addBridges(DiagnosticPosition pos, ClassSymbol origin, ListBuffer<JCTree> bridges) {
398 Type st = types.supertype(origin.type);
399 while (st.tag == CLASS) {
400 // if (isSpecialization(st))
401 addBridges(pos, st.tsym, origin, bridges);
402 st = types.supertype(st);
403 }
404 for (List<Type> l = types.interfaces(origin.type); l.nonEmpty(); l = l.tail)
405 // if (isSpecialization(l.head))
406 addBridges(pos, l.head.tsym, origin, bridges);
407 }
409 /* ************************************************************************
410 * Visitor methods
411 *************************************************************************/
413 /** Visitor argument: proto-type.
414 */
415 private Type pt;
417 /** Visitor method: perform a type translation on tree.
418 */
419 public <T extends JCTree> T translate(T tree, Type pt) {
420 Type prevPt = this.pt;
421 try {
422 this.pt = pt;
423 return translate(tree);
424 } finally {
425 this.pt = prevPt;
426 }
427 }
429 /** Visitor method: perform a type translation on list of trees.
430 */
431 public <T extends JCTree> List<T> translate(List<T> trees, Type pt) {
432 Type prevPt = this.pt;
433 List<T> res;
434 try {
435 this.pt = pt;
436 res = translate(trees);
437 } finally {
438 this.pt = prevPt;
439 }
440 return res;
441 }
443 public void visitClassDef(JCClassDecl tree) {
444 translateClass(tree.sym);
445 result = tree;
446 }
448 JCMethodDecl currentMethod = null;
449 public void visitMethodDef(JCMethodDecl tree) {
450 JCMethodDecl previousMethod = currentMethod;
451 try {
452 currentMethod = tree;
453 tree.restype = translate(tree.restype, null);
454 tree.typarams = List.nil();
455 tree.params = translateVarDefs(tree.params);
456 tree.thrown = translate(tree.thrown, null);
457 tree.body = translate(tree.body, tree.sym.erasure(types).getReturnType());
458 tree.type = erasure(tree.type);
459 result = tree;
460 } finally {
461 currentMethod = previousMethod;
462 }
464 // Check that we do not introduce a name clash by erasing types.
465 for (Scope.Entry e = tree.sym.owner.members().lookup(tree.name);
466 e.sym != null;
467 e = e.next()) {
468 if (e.sym != tree.sym &&
469 types.isSameType(erasure(e.sym.type), tree.type)) {
470 log.error(tree.pos(),
471 "name.clash.same.erasure", tree.sym,
472 e.sym);
473 return;
474 }
475 }
476 }
478 public void visitVarDef(JCVariableDecl tree) {
479 tree.vartype = translate(tree.vartype, null);
480 tree.init = translate(tree.init, tree.sym.erasure(types));
481 tree.type = erasure(tree.type);
482 result = tree;
483 }
485 public void visitDoLoop(JCDoWhileLoop tree) {
486 tree.body = translate(tree.body);
487 tree.cond = translate(tree.cond, syms.booleanType);
488 result = tree;
489 }
491 public void visitWhileLoop(JCWhileLoop tree) {
492 tree.cond = translate(tree.cond, syms.booleanType);
493 tree.body = translate(tree.body);
494 result = tree;
495 }
497 public void visitForLoop(JCForLoop tree) {
498 tree.init = translate(tree.init, null);
499 if (tree.cond != null)
500 tree.cond = translate(tree.cond, syms.booleanType);
501 tree.step = translate(tree.step, null);
502 tree.body = translate(tree.body);
503 result = tree;
504 }
506 public void visitForeachLoop(JCEnhancedForLoop tree) {
507 tree.var = translate(tree.var, null);
508 Type iterableType = tree.expr.type;
509 tree.expr = translate(tree.expr, erasure(tree.expr.type));
510 if (types.elemtype(tree.expr.type) == null)
511 tree.expr.type = iterableType; // preserve type for Lower
512 tree.body = translate(tree.body);
513 result = tree;
514 }
516 public void visitSwitch(JCSwitch tree) {
517 Type selsuper = types.supertype(tree.selector.type);
518 boolean enumSwitch = selsuper != null &&
519 selsuper.tsym == syms.enumSym;
520 Type target = enumSwitch ? erasure(tree.selector.type) : syms.intType;
521 tree.selector = translate(tree.selector, target);
522 tree.cases = translateCases(tree.cases);
523 result = tree;
524 }
526 public void visitCase(JCCase tree) {
527 tree.pat = translate(tree.pat, null);
528 tree.stats = translate(tree.stats);
529 result = tree;
530 }
532 public void visitSynchronized(JCSynchronized tree) {
533 tree.lock = translate(tree.lock, erasure(tree.lock.type));
534 tree.body = translate(tree.body);
535 result = tree;
536 }
538 public void visitTry(JCTry tree) {
539 tree.resources = translate(tree.resources, syms.autoCloseableType);
540 tree.body = translate(tree.body);
541 tree.catchers = translateCatchers(tree.catchers);
542 tree.finalizer = translate(tree.finalizer);
543 result = tree;
544 }
546 public void visitConditional(JCConditional tree) {
547 tree.cond = translate(tree.cond, syms.booleanType);
548 tree.truepart = translate(tree.truepart, erasure(tree.type));
549 tree.falsepart = translate(tree.falsepart, erasure(tree.type));
550 tree.type = erasure(tree.type);
551 result = retype(tree, tree.type, pt);
552 }
554 public void visitIf(JCIf tree) {
555 tree.cond = translate(tree.cond, syms.booleanType);
556 tree.thenpart = translate(tree.thenpart);
557 tree.elsepart = translate(tree.elsepart);
558 result = tree;
559 }
561 public void visitExec(JCExpressionStatement tree) {
562 tree.expr = translate(tree.expr, null);
563 result = tree;
564 }
566 public void visitReturn(JCReturn tree) {
567 tree.expr = translate(tree.expr, currentMethod.sym.erasure(types).getReturnType());
568 result = tree;
569 }
571 public void visitThrow(JCThrow tree) {
572 tree.expr = translate(tree.expr, erasure(tree.expr.type));
573 result = tree;
574 }
576 public void visitAssert(JCAssert tree) {
577 tree.cond = translate(tree.cond, syms.booleanType);
578 if (tree.detail != null)
579 tree.detail = translate(tree.detail, erasure(tree.detail.type));
580 result = tree;
581 }
583 public void visitApply(JCMethodInvocation tree) {
584 tree.meth = translate(tree.meth, null);
585 Symbol meth = TreeInfo.symbol(tree.meth);
586 Type mt = meth.erasure(types);
587 List<Type> argtypes = mt.getParameterTypes();
588 if (allowEnums &&
589 meth.name==names.init &&
590 meth.owner == syms.enumSym)
591 argtypes = argtypes.tail.tail;
592 if (tree.varargsElement != null)
593 tree.varargsElement = types.erasure(tree.varargsElement);
594 else
595 Assert.check(tree.args.length() == argtypes.length());
596 tree.args = translateArgs(tree.args, argtypes, tree.varargsElement);
598 // Insert casts of method invocation results as needed.
599 result = retype(tree, mt.getReturnType(), pt);
600 }
602 public void visitNewClass(JCNewClass tree) {
603 if (tree.encl != null)
604 tree.encl = translate(tree.encl, erasure(tree.encl.type));
605 tree.clazz = translate(tree.clazz, null);
606 if (tree.varargsElement != null)
607 tree.varargsElement = types.erasure(tree.varargsElement);
608 tree.args = translateArgs(
609 tree.args, tree.constructor.erasure(types).getParameterTypes(), tree.varargsElement);
610 tree.def = translate(tree.def, null);
611 tree.type = erasure(tree.type);
612 result = tree;
613 }
615 public void visitNewArray(JCNewArray tree) {
616 tree.elemtype = translate(tree.elemtype, null);
617 translate(tree.dims, syms.intType);
618 if (tree.type != null) {
619 tree.elems = translate(tree.elems, erasure(types.elemtype(tree.type)));
620 tree.type = erasure(tree.type);
621 } else {
622 tree.elems = translate(tree.elems, null);
623 }
625 result = tree;
626 }
628 @Override
629 public void visitLambda(JCLambda tree) {
630 Assert.error("Translation of lambda expression not supported yet");
631 }
633 @Override
634 public void visitReference(JCMemberReference tree) {
635 Assert.error("Translation of method reference not supported yet");
636 }
638 public void visitParens(JCParens tree) {
639 tree.expr = translate(tree.expr, pt);
640 tree.type = erasure(tree.type);
641 result = tree;
642 }
644 public void visitAssign(JCAssign tree) {
645 tree.lhs = translate(tree.lhs, null);
646 tree.rhs = translate(tree.rhs, erasure(tree.lhs.type));
647 tree.type = erasure(tree.type);
648 result = tree;
649 }
651 public void visitAssignop(JCAssignOp tree) {
652 tree.lhs = translate(tree.lhs, null);
653 tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
654 tree.type = erasure(tree.type);
655 result = tree;
656 }
658 public void visitUnary(JCUnary tree) {
659 tree.arg = translate(tree.arg, tree.operator.type.getParameterTypes().head);
660 result = tree;
661 }
663 public void visitBinary(JCBinary tree) {
664 tree.lhs = translate(tree.lhs, tree.operator.type.getParameterTypes().head);
665 tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
666 result = tree;
667 }
669 public void visitTypeCast(JCTypeCast tree) {
670 tree.clazz = translate(tree.clazz, null);
671 tree.type = erasure(tree.type);
672 tree.expr = translate(tree.expr, tree.type);
673 result = tree;
674 }
676 public void visitTypeTest(JCInstanceOf tree) {
677 tree.expr = translate(tree.expr, null);
678 tree.clazz = translate(tree.clazz, null);
679 result = tree;
680 }
682 public void visitIndexed(JCArrayAccess tree) {
683 tree.indexed = translate(tree.indexed, erasure(tree.indexed.type));
684 tree.index = translate(tree.index, syms.intType);
686 // Insert casts of indexed expressions as needed.
687 result = retype(tree, types.elemtype(tree.indexed.type), pt);
688 }
690 // There ought to be nothing to rewrite here;
691 // we don't generate code.
692 public void visitAnnotation(JCAnnotation tree) {
693 result = tree;
694 }
696 public void visitIdent(JCIdent tree) {
697 Type et = tree.sym.erasure(types);
699 // Map type variables to their bounds.
700 if (tree.sym.kind == TYP && tree.sym.type.tag == TYPEVAR) {
701 result = make.at(tree.pos).Type(et);
702 } else
703 // Map constants expressions to themselves.
704 if (tree.type.constValue() != null) {
705 result = tree;
706 }
707 // Insert casts of variable uses as needed.
708 else if (tree.sym.kind == VAR) {
709 result = retype(tree, et, pt);
710 }
711 else {
712 tree.type = erasure(tree.type);
713 result = tree;
714 }
715 }
717 public void visitSelect(JCFieldAccess tree) {
718 Type t = tree.selected.type;
719 while (t.tag == TYPEVAR)
720 t = t.getUpperBound();
721 if (t.isCompound()) {
722 if ((tree.sym.flags() & IPROXY) != 0) {
723 tree.sym = ((MethodSymbol)tree.sym).
724 implemented((TypeSymbol)tree.sym.owner, types);
725 }
726 tree.selected = coerce(
727 translate(tree.selected, erasure(tree.selected.type)),
728 erasure(tree.sym.owner.type));
729 } else
730 tree.selected = translate(tree.selected, erasure(t));
732 // Map constants expressions to themselves.
733 if (tree.type.constValue() != null) {
734 result = tree;
735 }
736 // Insert casts of variable uses as needed.
737 else if (tree.sym.kind == VAR) {
738 result = retype(tree, tree.sym.erasure(types), pt);
739 }
740 else {
741 tree.type = erasure(tree.type);
742 result = tree;
743 }
744 }
746 public void visitTypeArray(JCArrayTypeTree tree) {
747 tree.elemtype = translate(tree.elemtype, null);
748 tree.type = erasure(tree.type);
749 result = tree;
750 }
752 /** Visitor method for parameterized types.
753 */
754 public void visitTypeApply(JCTypeApply tree) {
755 JCTree clazz = translate(tree.clazz, null);
756 result = clazz;
757 }
759 /**************************************************************************
760 * utility methods
761 *************************************************************************/
763 private Type erasure(Type t) {
764 return types.erasure(t);
765 }
767 private boolean boundsRestricted(ClassSymbol c) {
768 Type st = types.supertype(c.type);
769 if (st.isParameterized()) {
770 List<Type> actuals = st.allparams();
771 List<Type> formals = st.tsym.type.allparams();
772 while (!actuals.isEmpty() && !formals.isEmpty()) {
773 Type actual = actuals.head;
774 Type formal = formals.head;
776 if (!types.isSameType(types.erasure(actual),
777 types.erasure(formal)))
778 return true;
780 actuals = actuals.tail;
781 formals = formals.tail;
782 }
783 }
784 return false;
785 }
787 private List<JCTree> addOverrideBridgesIfNeeded(DiagnosticPosition pos,
788 final ClassSymbol c) {
789 ListBuffer<JCTree> buf = ListBuffer.lb();
790 if (c.isInterface() || !boundsRestricted(c))
791 return buf.toList();
792 Type t = types.supertype(c.type);
793 Scope s = t.tsym.members();
794 if (s.elems != null) {
795 for (Symbol sym : s.getElements(new NeedsOverridBridgeFilter(c))) {
797 MethodSymbol m = (MethodSymbol)sym;
798 MethodSymbol member = (MethodSymbol)m.asMemberOf(c.type, types);
799 MethodSymbol impl = m.implementation(c, types, false);
801 if ((impl == null || impl.owner != c) &&
802 !types.isSameType(member.erasure(types), m.erasure(types))) {
803 addOverrideBridges(pos, m, member, c, buf);
804 }
805 }
806 }
807 return buf.toList();
808 }
809 // where
810 class NeedsOverridBridgeFilter implements Filter<Symbol> {
812 ClassSymbol c;
814 NeedsOverridBridgeFilter(ClassSymbol c) {
815 this.c = c;
816 }
817 public boolean accepts(Symbol s) {
818 return s.kind == MTH &&
819 !s.isConstructor() &&
820 s.isInheritedIn(c, types) &&
821 (s.flags() & FINAL) == 0 &&
822 (s.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) != SYNTHETIC;
823 }
824 }
826 private void addOverrideBridges(DiagnosticPosition pos,
827 MethodSymbol impl,
828 MethodSymbol member,
829 ClassSymbol c,
830 ListBuffer<JCTree> bridges) {
831 Type implErasure = impl.erasure(types);
832 long flags = (impl.flags() & AccessFlags) | SYNTHETIC | BRIDGE | OVERRIDE_BRIDGE;
833 member = new MethodSymbol(flags, member.name, member.type, c);
834 JCMethodDecl md = make.MethodDef(member, null);
835 JCExpression receiver = make.Super(types.supertype(c.type).tsym.erasure(types), c);
836 Type calltype = erasure(impl.type.getReturnType());
837 JCExpression call =
838 make.Apply(null,
839 make.Select(receiver, impl).setType(calltype),
840 translateArgs(make.Idents(md.params),
841 implErasure.getParameterTypes(), null))
842 .setType(calltype);
843 JCStatement stat = (member.getReturnType().tag == VOID)
844 ? make.Exec(call)
845 : make.Return(coerce(call, member.erasure(types).getReturnType()));
846 md.body = make.Block(0, List.of(stat));
847 c.members().enter(member);
848 bridges.append(md);
849 }
851 /**************************************************************************
852 * main method
853 *************************************************************************/
855 private Env<AttrContext> env;
857 void translateClass(ClassSymbol c) {
858 Type st = types.supertype(c.type);
860 // process superclass before derived
861 if (st.tag == CLASS)
862 translateClass((ClassSymbol)st.tsym);
864 Env<AttrContext> myEnv = enter.typeEnvs.remove(c);
865 if (myEnv == null)
866 return;
867 Env<AttrContext> oldEnv = env;
868 try {
869 env = myEnv;
870 // class has not been translated yet
872 TreeMaker savedMake = make;
873 Type savedPt = pt;
874 make = make.forToplevel(env.toplevel);
875 pt = null;
876 try {
877 JCClassDecl tree = (JCClassDecl) env.tree;
878 tree.typarams = List.nil();
879 super.visitClassDef(tree);
880 make.at(tree.pos);
881 if (addBridges) {
882 ListBuffer<JCTree> bridges = new ListBuffer<JCTree>();
883 if (false) //see CR: 6996415
884 bridges.appendList(addOverrideBridgesIfNeeded(tree, c));
885 if ((tree.sym.flags() & INTERFACE) == 0)
886 addBridges(tree.pos(), tree.sym, bridges);
887 tree.defs = bridges.toList().prependList(tree.defs);
888 }
889 tree.type = erasure(tree.type);
890 } finally {
891 make = savedMake;
892 pt = savedPt;
893 }
894 } finally {
895 env = oldEnv;
896 }
897 }
899 /** Translate a toplevel class definition.
900 * @param cdef The definition to be translated.
901 */
902 public JCTree translateTopLevelClass(JCTree cdef, TreeMaker make) {
903 // note that this method does NOT support recursion.
904 this.make = make;
905 pt = null;
906 return translate(cdef, null);
907 }
908 }
