ArgumentAttr.java revision 3063:161940723360
1/* 2 * Copyright (c) 2015, 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 */ 25 26package com.sun.tools.javac.comp; 27 28import com.sun.source.tree.LambdaExpressionTree.BodyKind; 29import com.sun.tools.javac.code.Flags; 30import com.sun.tools.javac.code.Symbol; 31import com.sun.tools.javac.code.Symtab; 32import com.sun.tools.javac.code.Type; 33import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 34import com.sun.tools.javac.comp.Attr.ResultInfo; 35import com.sun.tools.javac.comp.Attr.TargetInfo; 36import com.sun.tools.javac.comp.Check.CheckContext; 37import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 38import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext; 39import com.sun.tools.javac.comp.DeferredAttr.DeferredType; 40import com.sun.tools.javac.comp.DeferredAttr.DeferredTypeCompleter; 41import com.sun.tools.javac.comp.DeferredAttr.LambdaReturnScanner; 42import com.sun.tools.javac.comp.Infer.PartiallyInferredMethodType; 43import com.sun.tools.javac.comp.Resolve.MethodResolutionPhase; 44import com.sun.tools.javac.tree.JCTree; 45import com.sun.tools.javac.tree.JCTree.JCConditional; 46import com.sun.tools.javac.tree.JCTree.JCExpression; 47import com.sun.tools.javac.tree.JCTree.JCLambda; 48import com.sun.tools.javac.tree.JCTree.JCLambda.ParameterKind; 49import com.sun.tools.javac.tree.JCTree.JCMemberReference; 50import com.sun.tools.javac.tree.JCTree.JCMethodInvocation; 51import com.sun.tools.javac.tree.JCTree.JCNewClass; 52import com.sun.tools.javac.tree.JCTree.JCParens; 53import com.sun.tools.javac.tree.JCTree.JCReturn; 54import com.sun.tools.javac.tree.TreeCopier; 55import com.sun.tools.javac.tree.TreeInfo; 56import com.sun.tools.javac.util.Assert; 57import com.sun.tools.javac.util.Context; 58import com.sun.tools.javac.util.DiagnosticSource; 59import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 60import com.sun.tools.javac.util.List; 61import com.sun.tools.javac.util.ListBuffer; 62import com.sun.tools.javac.util.Log; 63 64import java.util.HashMap; 65import java.util.LinkedHashMap; 66import java.util.Map; 67import java.util.Optional; 68import java.util.function.Function; 69import java.util.function.Supplier; 70 71import static com.sun.tools.javac.code.TypeTag.DEFERRED; 72import static com.sun.tools.javac.code.TypeTag.FORALL; 73import static com.sun.tools.javac.code.TypeTag.METHOD; 74import static com.sun.tools.javac.code.TypeTag.VOID; 75 76/** 77 * This class performs attribution of method/constructor arguments when target-typing is enabled 78 * (source >= 8); for each argument that is potentially a poly expression, this class builds 79 * a rich representation (see {@link ArgumentType} which can then be used for performing fast overload 80 * checks without requiring multiple attribution passes over the same code. 81 * 82 * The attribution strategy for a given method/constructor argument A is as follows: 83 * 84 * - if A is potentially a poly expression (i.e. diamond instance creation expression), a speculative 85 * pass over A is performed; the results of such speculative attribution are then saved in a special 86 * type, so that enclosing overload resolution can be carried by simply checking compatibility against the 87 * type determined during this speculative pass. 88 * 89 * - if A is a standalone expression, regular atributtion takes place. 90 * 91 * To minimize the speculative work, a cache is used, so that already computed argument types 92 * associated with a given unique source location are never recomputed multiple times. 93 */ 94public class ArgumentAttr extends JCTree.Visitor { 95 96 protected static final Context.Key<ArgumentAttr> methodAttrKey = new Context.Key<>(); 97 98 private final DeferredAttr deferredAttr; 99 private final Attr attr; 100 private final Symtab syms; 101 private final Log log; 102 103 /** Attribution environment to be used. */ 104 private Env<AttrContext> env; 105 106 /** Result of method attribution. */ 107 private Type result; 108 109 /** Cache for argument types; behavior is influences by the currrently selected cache policy. */ 110 Map<UniquePos, ArgumentType<?>> argumentTypeCache = new LinkedHashMap<>(); 111 112 public static ArgumentAttr instance(Context context) { 113 ArgumentAttr instance = context.get(methodAttrKey); 114 if (instance == null) 115 instance = new ArgumentAttr(context); 116 return instance; 117 } 118 119 protected ArgumentAttr(Context context) { 120 context.put(methodAttrKey, this); 121 deferredAttr = DeferredAttr.instance(context); 122 attr = Attr.instance(context); 123 syms = Symtab.instance(context); 124 log = Log.instance(context); 125 } 126 127 /** 128 * Set the results of method attribution. 129 */ 130 void setResult(JCExpression tree, Type type) { 131 result = type; 132 if (env.info.isSpeculative) { 133 //if we are in a speculative branch we can save the type in the tree itself 134 //as there's no risk of polluting the original tree. 135 tree.type = result; 136 } 137 } 138 139 /** 140 * Checks a type in the speculative tree against a given result; the type can be either a plain 141 * type or an argument type,in which case a more complex check is required. 142 */ 143 Type checkSpeculative(JCExpression expr, ResultInfo resultInfo) { 144 return checkSpeculative(expr, expr.type, resultInfo); 145 } 146 147 /** 148 * Checks a type in the speculative tree against a given result; the type can be either a plain 149 * type or an argument type,in which case a more complex check is required. 150 */ 151 Type checkSpeculative(DiagnosticPosition pos, Type t, ResultInfo resultInfo) { 152 if (t.hasTag(DEFERRED)) { 153 return ((DeferredType)t).check(resultInfo); 154 } else { 155 return resultInfo.check(pos, t); 156 } 157 } 158 159 /** 160 * Returns a local caching context in which argument types can safely be cached without 161 * the risk of polluting enclosing contexts. This is useful when attempting speculative 162 * attribution of potentially erroneous expressions, which could end up polluting the cache. 163 */ 164 LocalCacheContext withLocalCacheContext() { 165 return new LocalCacheContext(); 166 } 167 168 /** 169 * Local cache context; this class keeps track of the previous cache and reverts to it 170 * when the {@link LocalCacheContext#leave()} method is called. 171 */ 172 class LocalCacheContext { 173 Map<UniquePos, ArgumentType<?>> prevCache; 174 175 public LocalCacheContext() { 176 this.prevCache = argumentTypeCache; 177 argumentTypeCache = new HashMap<>(); 178 } 179 180 public void leave() { 181 argumentTypeCache = prevCache; 182 } 183 } 184 185 /** 186 * Main entry point for attributing an argument with given tree and attribution environment. 187 */ 188 Type attribArg(JCTree tree, Env<AttrContext> env) { 189 Env<AttrContext> prevEnv = this.env; 190 try { 191 this.env = env; 192 tree.accept(this); 193 return result; 194 } finally { 195 this.env = prevEnv; 196 } 197 } 198 199 @Override 200 public void visitTree(JCTree that) { 201 //delegates to Attr 202 that.accept(attr); 203 result = attr.result; 204 } 205 206 /** 207 * Process a method argument; this method takes care of performing a speculative pass over the 208 * argument tree and calling a well-defined entry point to build the argument type associated 209 * with such tree. 210 */ 211 @SuppressWarnings("unchecked") 212 <T extends JCExpression, Z extends ArgumentType<T>> void processArg(T that, Function<T, Z> argumentTypeFactory) { 213 UniquePos pos = new UniquePos(that); 214 processArg(that, () -> { 215 T speculativeTree = (T)deferredAttr.attribSpeculative(that, env, attr.new MethodAttrInfo() { 216 @Override 217 protected void attr(JCTree tree, Env<AttrContext> env) { 218 //avoid speculative attribution loops 219 if (!new UniquePos(tree).equals(pos)) { 220 super.attr(tree, env); 221 } else { 222 visitTree(tree); 223 } 224 } 225 }); 226 return argumentTypeFactory.apply(speculativeTree); 227 }); 228 } 229 230 /** 231 * Process a method argument; this method allows the caller to specify a custom speculative attribution 232 * logic (this is used e.g. for lambdas). 233 */ 234 @SuppressWarnings("unchecked") 235 <T extends JCExpression, Z extends ArgumentType<T>> void processArg(T that, Supplier<Z> argumentTypeFactory) { 236 UniquePos pos = new UniquePos(that); 237 Z cached = (Z)argumentTypeCache.get(pos); 238 if (cached != null) { 239 //dup existing speculative type 240 setResult(that, cached.dup(that, env)); 241 } else { 242 Z res = argumentTypeFactory.get(); 243 argumentTypeCache.put(pos, res); 244 setResult(that, res); 245 } 246 } 247 248 @Override 249 public void visitParens(JCParens that) { 250 processArg(that, speculativeTree -> new ParensType(that, env, speculativeTree)); 251 } 252 253 @Override 254 public void visitConditional(JCConditional that) { 255 processArg(that, speculativeTree -> new ConditionalType(that, env, speculativeTree)); 256 } 257 258 @Override 259 public void visitReference(JCMemberReference tree) { 260 //perform arity-based check 261 Env<AttrContext> localEnv = env.dup(tree); 262 JCExpression exprTree = (JCExpression)deferredAttr.attribSpeculative(tree.getQualifierExpression(), localEnv, 263 attr.memberReferenceQualifierResult(tree)); 264 JCMemberReference mref2 = new TreeCopier<Void>(attr.make).copy(tree); 265 mref2.expr = exprTree; 266 Symbol lhsSym = TreeInfo.symbol(exprTree); 267 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == lhsSym.name.table.names._super; 268 Symbol res = 269 attr.rs.getMemberReference(tree, localEnv, mref2, 270 exprTree.type, tree.name); 271 if (!res.kind.isResolutionError()) { 272 tree.sym = res; 273 } 274 if (res.kind.isResolutionTargetError() || 275 res.type != null && res.type.hasTag(FORALL) || 276 (res.flags() & Flags.VARARGS) != 0 || 277 (TreeInfo.isStaticSelector(exprTree, tree.name.table.names) && 278 exprTree.type.isRaw())) { 279 tree.overloadKind = JCMemberReference.OverloadKind.OVERLOADED; 280 } else { 281 tree.overloadKind = JCMemberReference.OverloadKind.UNOVERLOADED; 282 } 283 //return a plain old deferred type for this 284 setResult(tree, deferredAttr.new DeferredType(tree, env)); 285 } 286 287 @Override 288 public void visitLambda(JCLambda that) { 289 if (that.paramKind == ParameterKind.EXPLICIT) { 290 //if lambda is explicit, we can save info in the corresponding argument type 291 processArg(that, () -> { 292 JCLambda speculativeLambda = 293 deferredAttr.attribSpeculativeLambda(that, env, attr.methodAttrInfo); 294 return new ExplicitLambdaType(that, env, speculativeLambda); 295 }); 296 } else { 297 //otherwise just use a deferred type 298 setResult(that, deferredAttr.new DeferredType(that, env)); 299 } 300 } 301 302 @Override 303 public void visitApply(JCMethodInvocation that) { 304 if (that.getTypeArguments().isEmpty()) { 305 processArg(that, speculativeTree -> new ResolvedMethodType(that, env, speculativeTree)); 306 } else { 307 //not a poly expression, just call Attr 308 setResult(that, attr.attribTree(that, env, attr.unknownExprInfo)); 309 } 310 } 311 312 @Override 313 public void visitNewClass(JCNewClass that) { 314 if (TreeInfo.isDiamond(that)) { 315 processArg(that, speculativeTree -> new ResolvedConstructorType(that, env, speculativeTree)); 316 } else { 317 //not a poly expression, just call Attr 318 setResult(that, attr.attribTree(that, env, attr.unknownExprInfo)); 319 } 320 } 321 322 /** 323 * An argument type is similar to a plain deferred type; the most important difference is that 324 * the completion logic associated with argument types allows speculative attribution to be skipped 325 * during overload resolution - that is, an argument type always has enough information to 326 * perform an overload check without the need of calling back to Attr. This extra information 327 * is typically stored in the form of a speculative tree. 328 */ 329 abstract class ArgumentType<T extends JCExpression> extends DeferredType implements DeferredTypeCompleter { 330 331 /** The speculative tree carrying type information. */ 332 T speculativeTree; 333 334 /** Types associated with this argument (one type per possible target result). */ 335 Map<ResultInfo, Type> speculativeTypes; 336 337 public ArgumentType(JCExpression tree, Env<AttrContext> env, T speculativeTree, Map<ResultInfo, Type> speculativeTypes) { 338 deferredAttr.super(tree, env); 339 this.speculativeTree = speculativeTree; 340 this.speculativeTypes = speculativeTypes; 341 } 342 343 @Override 344 final DeferredTypeCompleter completer() { 345 return this; 346 } 347 348 @Override 349 final public Type complete(DeferredType dt, ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) { 350 Assert.check(dt == this); 351 if (deferredAttrContext.mode == AttrMode.SPECULATIVE) { 352 Type t = (resultInfo.pt == Type.recoveryType) ? 353 deferredAttr.basicCompleter.complete(dt, resultInfo, deferredAttrContext) : 354 overloadCheck(resultInfo, deferredAttrContext); 355 speculativeTypes.put(resultInfo, t); 356 return t; 357 } else { 358 if (!env.info.isSpeculative) { 359 argumentTypeCache.remove(new UniquePos(dt.tree)); 360 } 361 return deferredAttr.basicCompleter.complete(dt, resultInfo, deferredAttrContext); 362 } 363 } 364 365 @Override 366 Type speculativeType(Symbol msym, MethodResolutionPhase phase) { 367 for (Map.Entry<ResultInfo, Type> _entry : speculativeTypes.entrySet()) { 368 DeferredAttrContext deferredAttrContext = _entry.getKey().checkContext.deferredAttrContext(); 369 if (deferredAttrContext.phase == phase && deferredAttrContext.msym == msym) { 370 return _entry.getValue(); 371 } 372 } 373 return Type.noType; 374 } 375 376 @Override 377 JCTree speculativeTree(DeferredAttrContext deferredAttrContext) { 378 return speculativeTree; 379 } 380 381 /** 382 * Performs an overload check against a given target result. 383 */ 384 abstract Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext); 385 386 /** 387 * Creates a copy of this argument type with given tree and environment. 388 */ 389 abstract ArgumentType<T> dup(T tree, Env<AttrContext> env); 390 } 391 392 /** 393 * Argument type for parenthesized expression. 394 */ 395 class ParensType extends ArgumentType<JCParens> { 396 ParensType(JCExpression tree, Env<AttrContext> env, JCParens speculativeParens) { 397 this(tree, env, speculativeParens, new HashMap<>()); 398 } 399 400 ParensType(JCExpression tree, Env<AttrContext> env, JCParens speculativeParens, Map<ResultInfo, Type> speculativeTypes) { 401 super(tree, env, speculativeParens, speculativeTypes); 402 } 403 404 @Override 405 Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) { 406 return checkSpeculative(speculativeTree.expr, resultInfo); 407 } 408 409 @Override 410 ArgumentType<JCParens> dup(JCParens tree, Env<AttrContext> env) { 411 return new ParensType(tree, env, speculativeTree, speculativeTypes); 412 } 413 } 414 415 /** 416 * Argument type for conditionals. 417 */ 418 class ConditionalType extends ArgumentType<JCConditional> { 419 ConditionalType(JCExpression tree, Env<AttrContext> env, JCConditional speculativeCond) { 420 this(tree, env, speculativeCond, new HashMap<>()); 421 } 422 423 ConditionalType(JCExpression tree, Env<AttrContext> env, JCConditional speculativeCond, Map<ResultInfo, Type> speculativeTypes) { 424 super(tree, env, speculativeCond, speculativeTypes); 425 } 426 427 @Override 428 Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) { 429 ResultInfo localInfo = resultInfo.dup(attr.conditionalContext(resultInfo.checkContext)); 430 if (speculativeTree.isStandalone()) { 431 return localInfo.check(speculativeTree, speculativeTree.type); 432 } else if (resultInfo.pt.hasTag(VOID)) { 433 //this means we are returning a poly conditional from void-compatible lambda expression 434 resultInfo.checkContext.report(tree, attr.diags.fragment("conditional.target.cant.be.void")); 435 return attr.types.createErrorType(resultInfo.pt); 436 } else { 437 //poly 438 checkSpeculative(speculativeTree.truepart, localInfo); 439 checkSpeculative(speculativeTree.falsepart, localInfo); 440 return localInfo.pt; 441 } 442 } 443 444 @Override 445 ArgumentType<JCConditional> dup(JCConditional tree, Env<AttrContext> env) { 446 return new ConditionalType(tree, env, speculativeTree, speculativeTypes); 447 } 448 } 449 450 /** 451 * Argument type for explicit lambdas. 452 */ 453 class ExplicitLambdaType extends ArgumentType<JCLambda> { 454 455 /** List of argument types (lazily populated). */ 456 Optional<List<Type>> argtypes = Optional.empty(); 457 458 /** List of return expressions (lazily populated). */ 459 Optional<List<JCReturn>> returnExpressions = Optional.empty(); 460 461 ExplicitLambdaType(JCLambda originalLambda, Env<AttrContext> env, JCLambda speculativeLambda) { 462 this(originalLambda, env, speculativeLambda, new HashMap<>()); 463 } 464 465 ExplicitLambdaType(JCLambda originalLambda, Env<AttrContext> env, JCLambda speculativeLambda, Map<ResultInfo, Type> speculativeTypes) { 466 super(originalLambda, env, speculativeLambda, speculativeTypes); 467 } 468 469 /** Compute argument types (if needed). */ 470 List<Type> argtypes() { 471 return argtypes.orElseGet(() -> { 472 List<Type> res = TreeInfo.types(speculativeTree.params); 473 argtypes = Optional.of(res); 474 return res; 475 }); 476 } 477 478 /** Compute return expressions (if needed). */ 479 List<JCReturn> returnExpressions() { 480 return returnExpressions.orElseGet(() -> { 481 final List<JCReturn> res; 482 if (speculativeTree.getBodyKind() == BodyKind.EXPRESSION) { 483 res = List.of(attr.make.Return((JCExpression)speculativeTree.body)); 484 } else { 485 ListBuffer<JCReturn> returnExpressions = new ListBuffer<>(); 486 new LambdaReturnScanner() { 487 @Override 488 public void visitReturn(JCReturn tree) { 489 returnExpressions.add(tree); 490 } 491 }.scan(speculativeTree.body); 492 res = returnExpressions.toList(); 493 } 494 returnExpressions = Optional.of(res); 495 return res; 496 }); 497 } 498 499 @Override 500 Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) { 501 try { 502 //compute target-type; this logic could be shared with Attr 503 TargetInfo targetInfo = attr.getTargetInfo(speculativeTree, resultInfo, argtypes()); 504 Type lambdaType = targetInfo.descriptor; 505 Type currentTarget = targetInfo.target; 506 //check compatibility 507 checkLambdaCompatible(lambdaType, resultInfo); 508 return currentTarget; 509 } catch (FunctionDescriptorLookupError ex) { 510 resultInfo.checkContext.report(null, ex.getDiagnostic()); 511 return null; //cannot get here 512 } 513 } 514 515 /** Check lambda against given target result */ 516 private void checkLambdaCompatible(Type descriptor, ResultInfo resultInfo) { 517 CheckContext checkContext = resultInfo.checkContext; 518 ResultInfo bodyResultInfo = attr.lambdaBodyResult(speculativeTree, descriptor, resultInfo); 519 for (JCReturn ret : returnExpressions()) { 520 Type t = getReturnType(ret); 521 if (speculativeTree.getBodyKind() == BodyKind.EXPRESSION || !t.hasTag(VOID)) { 522 checkSpeculative(ret.expr, t, bodyResultInfo); 523 } 524 } 525 526 attr.checkLambdaCompatible(speculativeTree, descriptor, checkContext); 527 } 528 529 /** Get the type associated with given return expression. */ 530 Type getReturnType(JCReturn ret) { 531 if (ret.expr == null) { 532 return syms.voidType; 533 } else { 534 return ret.expr.type; 535 } 536 } 537 538 @Override 539 ArgumentType<JCLambda> dup(JCLambda tree, Env<AttrContext> env) { 540 return new ExplicitLambdaType(tree, env, speculativeTree, speculativeTypes); 541 } 542 } 543 544 /** 545 * Argument type for methods/constructors. 546 */ 547 abstract class ResolvedMemberType<E extends JCExpression> extends ArgumentType<E> { 548 549 public ResolvedMemberType(JCExpression tree, Env<AttrContext> env, E speculativeMethod, Map<ResultInfo, Type> speculativeTypes) { 550 super(tree, env, speculativeMethod, speculativeTypes); 551 } 552 553 @Override 554 Type overloadCheck(ResultInfo resultInfo, DeferredAttrContext deferredAttrContext) { 555 Type mtype = methodType(); 556 ResultInfo localInfo = resultInfo(resultInfo); 557 if (mtype != null && mtype.hasTag(METHOD) && mtype.isPartial()) { 558 Type t = ((PartiallyInferredMethodType)mtype).check(localInfo); 559 if (!deferredAttrContext.inferenceContext.free(localInfo.pt)) { 560 speculativeTypes.put(localInfo, t); 561 return localInfo.check(tree.pos(), t); 562 } else { 563 return t; 564 } 565 } else { 566 Type t = localInfo.check(tree.pos(), speculativeTree.type); 567 speculativeTypes.put(localInfo, t); 568 return t; 569 } 570 } 571 572 /** 573 * Get the result info to be used for performing an overload check. 574 */ 575 abstract ResultInfo resultInfo(ResultInfo resultInfo); 576 577 /** 578 * Get the method type to be used for performing an overload check. 579 */ 580 abstract Type methodType(); 581 } 582 583 /** 584 * Argument type for methods. 585 */ 586 class ResolvedMethodType extends ResolvedMemberType<JCMethodInvocation> { 587 588 public ResolvedMethodType(JCExpression tree, Env<AttrContext> env, JCMethodInvocation speculativeTree) { 589 this(tree, env, speculativeTree, new HashMap<>()); 590 } 591 592 public ResolvedMethodType(JCExpression tree, Env<AttrContext> env, JCMethodInvocation speculativeTree, Map<ResultInfo, Type> speculativeTypes) { 593 super(tree, env, speculativeTree, speculativeTypes); 594 } 595 596 @Override 597 ResultInfo resultInfo(ResultInfo resultInfo) { 598 return resultInfo; 599 } 600 601 @Override 602 Type methodType() { 603 return speculativeTree.meth.type; 604 } 605 606 @Override 607 ArgumentType<JCMethodInvocation> dup(JCMethodInvocation tree, Env<AttrContext> env) { 608 return new ResolvedMethodType(tree, env, speculativeTree, speculativeTypes); 609 } 610 } 611 612 /** 613 * Argument type for constructors. 614 */ 615 class ResolvedConstructorType extends ResolvedMemberType<JCNewClass> { 616 617 public ResolvedConstructorType(JCExpression tree, Env<AttrContext> env, JCNewClass speculativeTree) { 618 this(tree, env, speculativeTree, new HashMap<>()); 619 } 620 621 public ResolvedConstructorType(JCExpression tree, Env<AttrContext> env, JCNewClass speculativeTree, Map<ResultInfo, Type> speculativeTypes) { 622 super(tree, env, speculativeTree, speculativeTypes); 623 } 624 625 @Override 626 ResultInfo resultInfo(ResultInfo resultInfo) { 627 return resultInfo.dup(attr.diamondContext(speculativeTree, speculativeTree.clazz.type.tsym, resultInfo.checkContext)); 628 } 629 630 @Override 631 Type methodType() { 632 return (speculativeTree.constructorType != null) ? 633 speculativeTree.constructorType.baseType() : syms.errType; 634 } 635 636 @Override 637 ArgumentType<JCNewClass> dup(JCNewClass tree, Env<AttrContext> env) { 638 return new ResolvedConstructorType(tree, env, speculativeTree, speculativeTypes); 639 } 640 } 641 642 /** 643 * An instance of this class represents a unique position in a compilation unit. A unique 644 * position is made up of (i) a unique position in a source file (char offset) and (ii) 645 * a source file info. 646 */ 647 class UniquePos { 648 649 /** Char offset. */ 650 int pos; 651 652 /** Source info. */ 653 DiagnosticSource source; 654 655 UniquePos(JCTree tree) { 656 this.pos = tree.pos; 657 this.source = log.currentSource(); 658 } 659 660 @Override 661 public int hashCode() { 662 return pos << 16 + source.hashCode(); 663 } 664 665 @Override 666 public boolean equals(Object obj) { 667 if (obj instanceof UniquePos) { 668 UniquePos that = (UniquePos)obj; 669 return pos == that.pos && source == that.source; 670 } else { 671 return false; 672 } 673 } 674 675 @Override 676 public String toString() { 677 return source.getFile().getName() + " @ " + source.getLineNumber(pos); 678 } 679 } 680} 681