--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,5135 @@
+/*
+ * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.tools.javac.comp;
+
+import java.util.*;
+
+import javax.lang.model.element.ElementKind;
+import javax.tools.JavaFileObject;
+
+import com.sun.source.tree.IdentifierTree;
+import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
+import com.sun.source.tree.MemberSelectTree;
+import com.sun.source.tree.TreeVisitor;
+import com.sun.source.util.SimpleTreeVisitor;
+import com.sun.tools.javac.code.*;
+import com.sun.tools.javac.code.Directive.RequiresFlag;
+import com.sun.tools.javac.code.Lint.LintCategory;
+import com.sun.tools.javac.code.Scope.WriteableScope;
+import com.sun.tools.javac.code.Symbol.*;
+import com.sun.tools.javac.code.Type.*;
+import com.sun.tools.javac.code.TypeMetadata.Annotations;
+import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
+import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
+import com.sun.tools.javac.comp.Check.CheckContext;
+import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
+import com.sun.tools.javac.comp.Infer.FreeTypeListener;
+import com.sun.tools.javac.jvm.*;
+import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
+import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
+import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
+import com.sun.tools.javac.resources.CompilerProperties.Errors;
+import com.sun.tools.javac.resources.CompilerProperties.Fragments;
+import com.sun.tools.javac.resources.CompilerProperties.Warnings;
+import com.sun.tools.javac.tree.*;
+import com.sun.tools.javac.tree.JCTree.*;
+import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
+import com.sun.tools.javac.util.*;
+import com.sun.tools.javac.util.DefinedBy.Api;
+import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
+import com.sun.tools.javac.util.JCDiagnostic.Fragment;
+import com.sun.tools.javac.util.List;
+
+import static com.sun.tools.javac.code.Flags.*;
+import static com.sun.tools.javac.code.Flags.ANNOTATION;
+import static com.sun.tools.javac.code.Flags.BLOCK;
+import static com.sun.tools.javac.code.Kinds.*;
+import static com.sun.tools.javac.code.Kinds.Kind.*;
+import static com.sun.tools.javac.code.TypeTag.*;
+import static com.sun.tools.javac.code.TypeTag.WILDCARD;
+import static com.sun.tools.javac.tree.JCTree.Tag.*;
+import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
+
+/** This is the main context-dependent analysis phase in GJC. It
+ * encompasses name resolution, type checking and constant folding as
+ * subtasks. Some subtasks involve auxiliary classes.
+ * @see Check
+ * @see Resolve
+ * @see ConstFold
+ * @see Infer
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own risk.
+ * This code and its internal interfaces are subject to change or
+ * deletion without notice.</b>
+ */
+public class Attr extends JCTree.Visitor {
+ protected static final Context.Key<Attr> attrKey = new Context.Key<>();
+
+ final Names names;
+ final Log log;
+ final Symtab syms;
+ final Resolve rs;
+ final Operators operators;
+ final Infer infer;
+ final Analyzer analyzer;
+ final DeferredAttr deferredAttr;
+ final Check chk;
+ final Flow flow;
+ final MemberEnter memberEnter;
+ final TypeEnter typeEnter;
+ final TreeMaker make;
+ final ConstFold cfolder;
+ final Enter enter;
+ final Target target;
+ final Types types;
+ final JCDiagnostic.Factory diags;
+ final TypeAnnotations typeAnnotations;
+ final DeferredLintHandler deferredLintHandler;
+ final TypeEnvs typeEnvs;
+ final Dependencies dependencies;
+ final Annotate annotate;
+ final ArgumentAttr argumentAttr;
+
+ public static Attr instance(Context context) {
+ Attr instance = context.get(attrKey);
+ if (instance == null)
+ instance = new Attr(context);
+ return instance;
+ }
+
+ protected Attr(Context context) {
+ context.put(attrKey, this);
+
+ names = Names.instance(context);
+ log = Log.instance(context);
+ syms = Symtab.instance(context);
+ rs = Resolve.instance(context);
+ operators = Operators.instance(context);
+ chk = Check.instance(context);
+ flow = Flow.instance(context);
+ memberEnter = MemberEnter.instance(context);
+ typeEnter = TypeEnter.instance(context);
+ make = TreeMaker.instance(context);
+ enter = Enter.instance(context);
+ infer = Infer.instance(context);
+ analyzer = Analyzer.instance(context);
+ deferredAttr = DeferredAttr.instance(context);
+ cfolder = ConstFold.instance(context);
+ target = Target.instance(context);
+ types = Types.instance(context);
+ diags = JCDiagnostic.Factory.instance(context);
+ annotate = Annotate.instance(context);
+ typeAnnotations = TypeAnnotations.instance(context);
+ deferredLintHandler = DeferredLintHandler.instance(context);
+ typeEnvs = TypeEnvs.instance(context);
+ dependencies = Dependencies.instance(context);
+ argumentAttr = ArgumentAttr.instance(context);
+
+ Options options = Options.instance(context);
+
+ Source source = Source.instance(context);
+ allowStringsInSwitch = source.allowStringsInSwitch();
+ allowPoly = source.allowPoly();
+ allowTypeAnnos = source.allowTypeAnnotations();
+ allowLambda = source.allowLambda();
+ allowDefaultMethods = source.allowDefaultMethods();
+ allowStaticInterfaceMethods = source.allowStaticInterfaceMethods();
+ sourceName = source.name;
+ useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
+
+ statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
+ varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
+ unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
+ methodAttrInfo = new MethodAttrInfo();
+ unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
+ unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
+ recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
+ }
+
+ /** Switch: support target-typing inference
+ */
+ boolean allowPoly;
+
+ /** Switch: support type annotations.
+ */
+ boolean allowTypeAnnos;
+
+ /** Switch: support lambda expressions ?
+ */
+ boolean allowLambda;
+
+ /** Switch: support default methods ?
+ */
+ boolean allowDefaultMethods;
+
+ /** Switch: static interface methods enabled?
+ */
+ boolean allowStaticInterfaceMethods;
+
+ /**
+ * Switch: warn about use of variable before declaration?
+ * RFE: 6425594
+ */
+ boolean useBeforeDeclarationWarning;
+
+ /**
+ * Switch: allow strings in switch?
+ */
+ boolean allowStringsInSwitch;
+
+ /**
+ * Switch: name of source level; used for error reporting.
+ */
+ String sourceName;
+
+ /** Check kind and type of given tree against protokind and prototype.
+ * If check succeeds, store type in tree and return it.
+ * If check fails, store errType in tree and return it.
+ * No checks are performed if the prototype is a method type.
+ * It is not necessary in this case since we know that kind and type
+ * are correct.
+ *
+ * @param tree The tree whose kind and type is checked
+ * @param found The computed type of the tree
+ * @param ownkind The computed kind of the tree
+ * @param resultInfo The expected result of the tree
+ */
+ Type check(final JCTree tree,
+ final Type found,
+ final KindSelector ownkind,
+ final ResultInfo resultInfo) {
+ InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
+ Type owntype;
+ boolean shouldCheck = !found.hasTag(ERROR) &&
+ !resultInfo.pt.hasTag(METHOD) &&
+ !resultInfo.pt.hasTag(FORALL);
+ if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
+ log.error(tree.pos(),
+ Errors.UnexpectedType(resultInfo.pkind.kindNames(),
+ ownkind.kindNames()));
+ owntype = types.createErrorType(found);
+ } else if (allowPoly && inferenceContext.free(found)) {
+ //delay the check if there are inference variables in the found type
+ //this means we are dealing with a partially inferred poly expression
+ owntype = shouldCheck ? resultInfo.pt : found;
+ if (resultInfo.checkMode.installPostInferenceHook()) {
+ inferenceContext.addFreeTypeListener(List.of(found),
+ instantiatedContext -> {
+ ResultInfo pendingResult =
+ resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
+ check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
+ });
+ }
+ } else {
+ owntype = shouldCheck ?
+ resultInfo.check(tree, found) :
+ found;
+ }
+ if (resultInfo.checkMode.updateTreeType()) {
+ tree.type = owntype;
+ }
+ return owntype;
+ }
+
+ /** Is given blank final variable assignable, i.e. in a scope where it
+ * may be assigned to even though it is final?
+ * @param v The blank final variable.
+ * @param env The current environment.
+ */
+ boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
+ Symbol owner = env.info.scope.owner;
+ // owner refers to the innermost variable, method or
+ // initializer block declaration at this point.
+ return
+ v.owner == owner
+ ||
+ ((owner.name == names.init || // i.e. we are in a constructor
+ owner.kind == VAR || // i.e. we are in a variable initializer
+ (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
+ &&
+ v.owner == owner.owner
+ &&
+ ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
+ }
+
+ /** Check that variable can be assigned to.
+ * @param pos The current source code position.
+ * @param v The assigned variable
+ * @param base If the variable is referred to in a Select, the part
+ * to the left of the `.', null otherwise.
+ * @param env The current environment.
+ */
+ void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
+ if (v.name == names._this) {
+ log.error(pos, Errors.CantAssignValToThis);
+ } else if ((v.flags() & FINAL) != 0 &&
+ ((v.flags() & HASINIT) != 0
+ ||
+ !((base == null ||
+ (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
+ isAssignableAsBlankFinal(v, env)))) {
+ if (v.isResourceVariable()) { //TWR resource
+ log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
+ } else {
+ log.error(pos, Errors.CantAssignValToFinalVar(v));
+ }
+ }
+ }
+
+ /** Does tree represent a static reference to an identifier?
+ * It is assumed that tree is either a SELECT or an IDENT.
+ * We have to weed out selects from non-type names here.
+ * @param tree The candidate tree.
+ */
+ boolean isStaticReference(JCTree tree) {
+ if (tree.hasTag(SELECT)) {
+ Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
+ if (lsym == null || lsym.kind != TYP) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ /** Is this symbol a type?
+ */
+ static boolean isType(Symbol sym) {
+ return sym != null && sym.kind == TYP;
+ }
+
+ /** The current `this' symbol.
+ * @param env The current environment.
+ */
+ Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
+ return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
+ }
+
+ /** Attribute a parsed identifier.
+ * @param tree Parsed identifier name
+ * @param topLevel The toplevel to use
+ */
+ public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
+ Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
+ localEnv.enclClass = make.ClassDef(make.Modifiers(0),
+ syms.errSymbol.name,
+ null, null, null, null);
+ localEnv.enclClass.sym = syms.errSymbol;
+ return attribIdent(tree, localEnv);
+ }
+
+ /** Attribute a parsed identifier.
+ * @param tree Parsed identifier name
+ * @param env The env to use
+ */
+ public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
+ return tree.accept(identAttributer, env);
+ }
+ // where
+ private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
+ private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
+ @Override @DefinedBy(Api.COMPILER_TREE)
+ public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
+ Symbol site = visit(node.getExpression(), env);
+ if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
+ return site;
+ Name name = (Name)node.getIdentifier();
+ if (site.kind == PCK) {
+ env.toplevel.packge = (PackageSymbol)site;
+ return rs.findIdentInPackage(env, (TypeSymbol)site, name,
+ KindSelector.TYP_PCK);
+ } else {
+ env.enclClass.sym = (ClassSymbol)site;
+ return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
+ }
+ }
+
+ @Override @DefinedBy(Api.COMPILER_TREE)
+ public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
+ return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK);
+ }
+ }
+
+ public Type coerce(Type etype, Type ttype) {
+ return cfolder.coerce(etype, ttype);
+ }
+
+ public Type attribType(JCTree node, TypeSymbol sym) {
+ Env<AttrContext> env = typeEnvs.get(sym);
+ Env<AttrContext> localEnv = env.dup(node, env.info.dup());
+ return attribTree(node, localEnv, unknownTypeInfo);
+ }
+
+ public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
+ // Attribute qualifying package or class.
+ JCFieldAccess s = (JCFieldAccess)tree.qualid;
+ return attribTree(s.selected, env,
+ new ResultInfo(tree.staticImport ?
+ KindSelector.TYP : KindSelector.TYP_PCK,
+ Type.noType));
+ }
+
+ public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
+ breakTree = tree;
+ JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
+ try {
+ attribExpr(expr, env);
+ } catch (BreakAttr b) {
+ return b.env;
+ } catch (AssertionError ae) {
+ if (ae.getCause() instanceof BreakAttr) {
+ return ((BreakAttr)(ae.getCause())).env;
+ } else {
+ throw ae;
+ }
+ } finally {
+ breakTree = null;
+ log.useSource(prev);
+ }
+ return env;
+ }
+
+ public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
+ breakTree = tree;
+ JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
+ try {
+ attribStat(stmt, env);
+ } catch (BreakAttr b) {
+ return b.env;
+ } catch (AssertionError ae) {
+ if (ae.getCause() instanceof BreakAttr) {
+ return ((BreakAttr)(ae.getCause())).env;
+ } else {
+ throw ae;
+ }
+ } finally {
+ breakTree = null;
+ log.useSource(prev);
+ }
+ return env;
+ }
+
+ private JCTree breakTree = null;
+
+ private static class BreakAttr extends RuntimeException {
+ static final long serialVersionUID = -6924771130405446405L;
+ private Env<AttrContext> env;
+ private BreakAttr(Env<AttrContext> env) {
+ this.env = env;
+ }
+ }
+
+ /**
+ * Mode controlling behavior of Attr.Check
+ */
+ enum CheckMode {
+
+ NORMAL,
+
+ /**
+ * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
+ * that the captured var cache in {@code InferenceContext} will be used in read-only
+ * mode when performing inference checks.
+ */
+ NO_TREE_UPDATE {
+ @Override
+ public boolean updateTreeType() {
+ return false;
+ }
+ },
+ /**
+ * Mode signalling that caller will manage free types in tree decorations.
+ */
+ NO_INFERENCE_HOOK {
+ @Override
+ public boolean installPostInferenceHook() {
+ return false;
+ }
+ };
+
+ public boolean updateTreeType() {
+ return true;
+ }
+ public boolean installPostInferenceHook() {
+ return true;
+ }
+ }
+
+
+ class ResultInfo {
+ final KindSelector pkind;
+ final Type pt;
+ final CheckContext checkContext;
+ final CheckMode checkMode;
+
+ ResultInfo(KindSelector pkind, Type pt) {
+ this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
+ }
+
+ ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
+ this(pkind, pt, chk.basicHandler, checkMode);
+ }
+
+ protected ResultInfo(KindSelector pkind,
+ Type pt, CheckContext checkContext) {
+ this(pkind, pt, checkContext, CheckMode.NORMAL);
+ }
+
+ protected ResultInfo(KindSelector pkind,
+ Type pt, CheckContext checkContext, CheckMode checkMode) {
+ this.pkind = pkind;
+ this.pt = pt;
+ this.checkContext = checkContext;
+ this.checkMode = checkMode;
+ }
+
+ /**
+ * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
+ * @param tree The tree to be type-checked.
+ * @return true if {@ArgumentAttr} should be used.
+ */
+ protected boolean needsArgumentAttr(JCTree tree) { return false; }
+
+ protected Type check(final DiagnosticPosition pos, final Type found) {
+ return chk.checkType(pos, found, pt, checkContext);
+ }
+
+ protected ResultInfo dup(Type newPt) {
+ return new ResultInfo(pkind, newPt, checkContext, checkMode);
+ }
+
+ protected ResultInfo dup(CheckContext newContext) {
+ return new ResultInfo(pkind, pt, newContext, checkMode);
+ }
+
+ protected ResultInfo dup(Type newPt, CheckContext newContext) {
+ return new ResultInfo(pkind, newPt, newContext, checkMode);
+ }
+
+ protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
+ return new ResultInfo(pkind, newPt, newContext, newMode);
+ }
+
+ protected ResultInfo dup(CheckMode newMode) {
+ return new ResultInfo(pkind, pt, checkContext, newMode);
+ }
+
+ @Override
+ public String toString() {
+ if (pt != null) {
+ return pt.toString();
+ } else {
+ return "";
+ }
+ }
+ }
+
+ class MethodAttrInfo extends ResultInfo {
+ public MethodAttrInfo() {
+ this(chk.basicHandler);
+ }
+
+ public MethodAttrInfo(CheckContext checkContext) {
+ super(KindSelector.VAL, Infer.anyPoly, checkContext);
+ }
+
+ @Override
+ protected boolean needsArgumentAttr(JCTree tree) {
+ return true;
+ }
+
+ protected ResultInfo dup(Type newPt) {
+ throw new IllegalStateException();
+ }
+
+ protected ResultInfo dup(CheckContext newContext) {
+ return new MethodAttrInfo(newContext);
+ }
+
+ protected ResultInfo dup(Type newPt, CheckContext newContext) {
+ throw new IllegalStateException();
+ }
+
+ protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
+ throw new IllegalStateException();
+ }
+
+ protected ResultInfo dup(CheckMode newMode) {
+ throw new IllegalStateException();
+ }
+ }
+
+ class RecoveryInfo extends ResultInfo {
+
+ public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
+ super(KindSelector.VAL, Type.recoveryType,
+ new Check.NestedCheckContext(chk.basicHandler) {
+ @Override
+ public DeferredAttr.DeferredAttrContext deferredAttrContext() {
+ return deferredAttrContext;
+ }
+ @Override
+ public boolean compatible(Type found, Type req, Warner warn) {
+ return true;
+ }
+ @Override
+ public void report(DiagnosticPosition pos, JCDiagnostic details) {
+ chk.basicHandler.report(pos, details);
+ }
+ });
+ }
+ }
+
+ final ResultInfo statInfo;
+ final ResultInfo varAssignmentInfo;
+ final ResultInfo methodAttrInfo;
+ final ResultInfo unknownExprInfo;
+ final ResultInfo unknownTypeInfo;
+ final ResultInfo unknownTypeExprInfo;
+ final ResultInfo recoveryInfo;
+
+ Type pt() {
+ return resultInfo.pt;
+ }
+
+ KindSelector pkind() {
+ return resultInfo.pkind;
+ }
+
+/* ************************************************************************
+ * Visitor methods
+ *************************************************************************/
+
+ /** Visitor argument: the current environment.
+ */
+ Env<AttrContext> env;
+
+ /** Visitor argument: the currently expected attribution result.
+ */
+ ResultInfo resultInfo;
+
+ /** Visitor result: the computed type.
+ */
+ Type result;
+
+ /** Visitor method: attribute a tree, catching any completion failure
+ * exceptions. Return the tree's type.
+ *
+ * @param tree The tree to be visited.
+ * @param env The environment visitor argument.
+ * @param resultInfo The result info visitor argument.
+ */
+ Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
+ Env<AttrContext> prevEnv = this.env;
+ ResultInfo prevResult = this.resultInfo;
+ try {
+ this.env = env;
+ this.resultInfo = resultInfo;
+ if (resultInfo.needsArgumentAttr(tree)) {
+ result = argumentAttr.attribArg(tree, env);
+ } else {
+ tree.accept(this);
+ }
+ if (tree == breakTree &&
+ resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
+ throw new BreakAttr(copyEnv(env));
+ }
+ return result;
+ } catch (CompletionFailure ex) {
+ tree.type = syms.errType;
+ return chk.completionError(tree.pos(), ex);
+ } finally {
+ this.env = prevEnv;
+ this.resultInfo = prevResult;
+ }
+ }
+
+ Env<AttrContext> copyEnv(Env<AttrContext> env) {
+ Env<AttrContext> newEnv =
+ env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
+ if (newEnv.outer != null) {
+ newEnv.outer = copyEnv(newEnv.outer);
+ }
+ return newEnv;
+ }
+
+ WriteableScope copyScope(WriteableScope sc) {
+ WriteableScope newScope = WriteableScope.create(sc.owner);
+ List<Symbol> elemsList = List.nil();
+ for (Symbol sym : sc.getSymbols()) {
+ elemsList = elemsList.prepend(sym);
+ }
+ for (Symbol s : elemsList) {
+ newScope.enter(s);
+ }
+ return newScope;
+ }
+
+ /** Derived visitor method: attribute an expression tree.
+ */
+ public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
+ return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
+ }
+
+ /** Derived visitor method: attribute an expression tree with
+ * no constraints on the computed type.
+ */
+ public Type attribExpr(JCTree tree, Env<AttrContext> env) {
+ return attribTree(tree, env, unknownExprInfo);
+ }
+
+ /** Derived visitor method: attribute a type tree.
+ */
+ public Type attribType(JCTree tree, Env<AttrContext> env) {
+ Type result = attribType(tree, env, Type.noType);
+ return result;
+ }
+
+ /** Derived visitor method: attribute a type tree.
+ */
+ Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
+ Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
+ return result;
+ }
+
+ /** Derived visitor method: attribute a statement or definition tree.
+ */
+ public Type attribStat(JCTree tree, Env<AttrContext> env) {
+ Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
+ try {
+ return attribTree(tree, env, statInfo);
+ } finally {
+ analyzer.analyzeIfNeeded(tree, analyzeEnv);
+ }
+ }
+
+ /** Attribute a list of expressions, returning a list of types.
+ */
+ List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
+ ListBuffer<Type> ts = new ListBuffer<>();
+ for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
+ ts.append(attribExpr(l.head, env, pt));
+ return ts.toList();
+ }
+
+ /** Attribute a list of statements, returning nothing.
+ */
+ <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
+ for (List<T> l = trees; l.nonEmpty(); l = l.tail)
+ attribStat(l.head, env);
+ }
+
+ /** Attribute the arguments in a method call, returning the method kind.
+ */
+ KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
+ KindSelector kind = initialKind;
+ for (JCExpression arg : trees) {
+ Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
+ if (argtype.hasTag(DEFERRED)) {
+ kind = KindSelector.of(KindSelector.POLY, kind);
+ }
+ argtypes.append(argtype);
+ }
+ return kind;
+ }
+
+ /** Attribute a type argument list, returning a list of types.
+ * Caller is responsible for calling checkRefTypes.
+ */
+ List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
+ ListBuffer<Type> argtypes = new ListBuffer<>();
+ for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
+ argtypes.append(attribType(l.head, env));
+ return argtypes.toList();
+ }
+
+ /** Attribute a type argument list, returning a list of types.
+ * Check that all the types are references.
+ */
+ List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
+ List<Type> types = attribAnyTypes(trees, env);
+ return chk.checkRefTypes(trees, types);
+ }
+
+ /**
+ * Attribute type variables (of generic classes or methods).
+ * Compound types are attributed later in attribBounds.
+ * @param typarams the type variables to enter
+ * @param env the current environment
+ */
+ void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
+ for (JCTypeParameter tvar : typarams) {
+ TypeVar a = (TypeVar)tvar.type;
+ a.tsym.flags_field |= UNATTRIBUTED;
+ a.bound = Type.noType;
+ if (!tvar.bounds.isEmpty()) {
+ List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
+ for (JCExpression bound : tvar.bounds.tail)
+ bounds = bounds.prepend(attribType(bound, env));
+ types.setBounds(a, bounds.reverse());
+ } else {
+ // if no bounds are given, assume a single bound of
+ // java.lang.Object.
+ types.setBounds(a, List.of(syms.objectType));
+ }
+ a.tsym.flags_field &= ~UNATTRIBUTED;
+ }
+ for (JCTypeParameter tvar : typarams) {
+ chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
+ }
+ }
+
+ /**
+ * Attribute the type references in a list of annotations.
+ */
+ void attribAnnotationTypes(List<JCAnnotation> annotations,
+ Env<AttrContext> env) {
+ for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
+ JCAnnotation a = al.head;
+ attribType(a.annotationType, env);
+ }
+ }
+
+ /**
+ * Attribute a "lazy constant value".
+ * @param env The env for the const value
+ * @param variable The initializer for the const value
+ * @param type The expected type, or null
+ * @see VarSymbol#setLazyConstValue
+ */
+ public Object attribLazyConstantValue(Env<AttrContext> env,
+ JCVariableDecl variable,
+ Type type) {
+
+ DiagnosticPosition prevLintPos
+ = deferredLintHandler.setPos(variable.pos());
+
+ final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
+ try {
+ Type itype = attribExpr(variable.init, env, type);
+ if (itype.constValue() != null) {
+ return coerce(itype, type).constValue();
+ } else {
+ return null;
+ }
+ } finally {
+ log.useSource(prevSource);
+ deferredLintHandler.setPos(prevLintPos);
+ }
+ }
+
+ /** Attribute type reference in an `extends' or `implements' clause.
+ * Supertypes of anonymous inner classes are usually already attributed.
+ *
+ * @param tree The tree making up the type reference.
+ * @param env The environment current at the reference.
+ * @param classExpected true if only a class is expected here.
+ * @param interfaceExpected true if only an interface is expected here.
+ */
+ Type attribBase(JCTree tree,
+ Env<AttrContext> env,
+ boolean classExpected,
+ boolean interfaceExpected,
+ boolean checkExtensible) {
+ Type t = tree.type != null ?
+ tree.type :
+ attribType(tree, env);
+ return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
+ }
+ Type checkBase(Type t,
+ JCTree tree,
+ Env<AttrContext> env,
+ boolean classExpected,
+ boolean interfaceExpected,
+ boolean checkExtensible) {
+ final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
+ (((JCTypeApply) tree).clazz).pos() : tree.pos();
+ if (t.tsym.isAnonymous()) {
+ log.error(pos, Errors.CantInheritFromAnon);
+ return types.createErrorType(t);
+ }
+ if (t.isErroneous())
+ return t;
+ if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
+ // check that type variable is already visible
+ if (t.getUpperBound() == null) {
+ log.error(pos, Errors.IllegalForwardRef);
+ return types.createErrorType(t);
+ }
+ } else {
+ t = chk.checkClassType(pos, t, checkExtensible);
+ }
+ if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
+ log.error(pos, Errors.IntfExpectedHere);
+ // return errType is necessary since otherwise there might
+ // be undetected cycles which cause attribution to loop
+ return types.createErrorType(t);
+ } else if (checkExtensible &&
+ classExpected &&
+ (t.tsym.flags() & INTERFACE) != 0) {
+ log.error(pos, Errors.NoIntfExpectedHere);
+ return types.createErrorType(t);
+ }
+ if (checkExtensible &&
+ ((t.tsym.flags() & FINAL) != 0)) {
+ log.error(pos,
+ Errors.CantInheritFromFinal(t.tsym));
+ }
+ chk.checkNonCyclic(pos, t);
+ return t;
+ }
+
+ Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
+ Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
+ id.type = env.info.scope.owner.enclClass().type;
+ id.sym = env.info.scope.owner.enclClass();
+ return id.type;
+ }
+
+ public void visitClassDef(JCClassDecl tree) {
+ Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
+ Optional.ofNullable(env.info.isSpeculative ?
+ argumentAttr.withLocalCacheContext() : null);
+ try {
+ // Local and anonymous classes have not been entered yet, so we need to
+ // do it now.
+ if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
+ enter.classEnter(tree, env);
+ } else {
+ // If this class declaration is part of a class level annotation,
+ // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
+ // order to simplify later steps and allow for sensible error
+ // messages.
+ if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
+ enter.classEnter(tree, env);
+ }
+
+ ClassSymbol c = tree.sym;
+ if (c == null) {
+ // exit in case something drastic went wrong during enter.
+ result = null;
+ } else {
+ // make sure class has been completed:
+ c.complete();
+
+ // If this class appears as an anonymous class
+ // in a superclass constructor call
+ // disable implicit outer instance from being passed.
+ // (This would be an illegal access to "this before super").
+ if (env.info.isSelfCall &&
+ env.tree.hasTag(NEWCLASS)) {
+ c.flags_field |= NOOUTERTHIS;
+ }
+ attribClass(tree.pos(), c);
+ result = tree.type = c.type;
+ }
+ } finally {
+ localCacheContext.ifPresent(LocalCacheContext::leave);
+ }
+ }
+
+ public void visitMethodDef(JCMethodDecl tree) {
+ MethodSymbol m = tree.sym;
+ boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
+
+ Lint lint = env.info.lint.augment(m);
+ Lint prevLint = chk.setLint(lint);
+ MethodSymbol prevMethod = chk.setMethod(m);
+ try {
+ deferredLintHandler.flush(tree.pos());
+ chk.checkDeprecatedAnnotation(tree.pos(), m);
+
+
+ // Create a new environment with local scope
+ // for attributing the method.
+ Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
+ localEnv.info.lint = lint;
+
+ attribStats(tree.typarams, localEnv);
+
+ // If we override any other methods, check that we do so properly.
+ // JLS ???
+ if (m.isStatic()) {
+ chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
+ } else {
+ chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
+ }
+ chk.checkOverride(env, tree, m);
+
+ if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
+ log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
+ }
+
+ // Enter all type parameters into the local method scope.
+ for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
+ localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
+
+ ClassSymbol owner = env.enclClass.sym;
+ if ((owner.flags() & ANNOTATION) != 0 &&
+ (tree.params.nonEmpty() ||
+ tree.recvparam != null))
+ log.error(tree.params.nonEmpty() ?
+ tree.params.head.pos() :
+ tree.recvparam.pos(),
+ Errors.IntfAnnotationMembersCantHaveParams);
+
+ // Attribute all value parameters.
+ for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
+ attribStat(l.head, localEnv);
+ }
+
+ chk.checkVarargsMethodDecl(localEnv, tree);
+
+ // Check that type parameters are well-formed.
+ chk.validate(tree.typarams, localEnv);
+
+ // Check that result type is well-formed.
+ if (tree.restype != null && !tree.restype.type.hasTag(VOID))
+ chk.validate(tree.restype, localEnv);
+
+ // Check that receiver type is well-formed.
+ if (tree.recvparam != null) {
+ // Use a new environment to check the receiver parameter.
+ // Otherwise I get "might not have been initialized" errors.
+ // Is there a better way?
+ Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
+ attribType(tree.recvparam, newEnv);
+ chk.validate(tree.recvparam, newEnv);
+ }
+
+ // annotation method checks
+ if ((owner.flags() & ANNOTATION) != 0) {
+ // annotation method cannot have throws clause
+ if (tree.thrown.nonEmpty()) {
+ log.error(tree.thrown.head.pos(),
+ Errors.ThrowsNotAllowedInIntfAnnotation);
+ }
+ // annotation method cannot declare type-parameters
+ if (tree.typarams.nonEmpty()) {
+ log.error(tree.typarams.head.pos(),
+ Errors.IntfAnnotationMembersCantHaveTypeParams);
+ }
+ // validate annotation method's return type (could be an annotation type)
+ chk.validateAnnotationType(tree.restype);
+ // ensure that annotation method does not clash with members of Object/Annotation
+ chk.validateAnnotationMethod(tree.pos(), m);
+ }
+
+ for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
+ chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
+
+ if (tree.body == null) {
+ // Empty bodies are only allowed for
+ // abstract, native, or interface methods, or for methods
+ // in a retrofit signature class.
+ if (tree.defaultValue != null) {
+ if ((owner.flags() & ANNOTATION) == 0)
+ log.error(tree.pos(),
+ Errors.DefaultAllowedInIntfAnnotationMember);
+ }
+ if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
+ log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
+ } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
+ if ((owner.flags() & INTERFACE) != 0) {
+ log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
+ } else {
+ log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
+ }
+ } else if ((tree.mods.flags & NATIVE) != 0) {
+ log.error(tree.pos(), Errors.NativeMethCantHaveBody);
+ } else {
+ // Add an implicit super() call unless an explicit call to
+ // super(...) or this(...) is given
+ // or we are compiling class java.lang.Object.
+ if (tree.name == names.init && owner.type != syms.objectType) {
+ JCBlock body = tree.body;
+ if (body.stats.isEmpty() ||
+ !TreeInfo.isSelfCall(body.stats.head)) {
+ body.stats = body.stats.
+ prepend(typeEnter.SuperCall(make.at(body.pos),
+ List.nil(),
+ List.nil(),
+ false));
+ } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
+ (tree.mods.flags & GENERATEDCONSTR) == 0 &&
+ TreeInfo.isSuperCall(body.stats.head)) {
+ // enum constructors are not allowed to call super
+ // directly, so make sure there aren't any super calls
+ // in enum constructors, except in the compiler
+ // generated one.
+ log.error(tree.body.stats.head.pos(),
+ Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
+ }
+ }
+
+ // Attribute all type annotations in the body
+ annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
+ annotate.flush();
+
+ // Attribute method body.
+ attribStat(tree.body, localEnv);
+ }
+
+ localEnv.info.scope.leave();
+ result = tree.type = m.type;
+ } finally {
+ chk.setLint(prevLint);
+ chk.setMethod(prevMethod);
+ }
+ }
+
+ public void visitVarDef(JCVariableDecl tree) {
+ // Local variables have not been entered yet, so we need to do it now:
+ if (env.info.scope.owner.kind == MTH) {
+ if (tree.sym != null) {
+ // parameters have already been entered
+ env.info.scope.enter(tree.sym);
+ } else {
+ try {
+ annotate.blockAnnotations();
+ memberEnter.memberEnter(tree, env);
+ } finally {
+ annotate.unblockAnnotations();
+ }
+ }
+ } else {
+ if (tree.init != null) {
+ // Field initializer expression need to be entered.
+ annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
+ annotate.flush();
+ }
+ }
+
+ VarSymbol v = tree.sym;
+ Lint lint = env.info.lint.augment(v);
+ Lint prevLint = chk.setLint(lint);
+
+ // Check that the variable's declared type is well-formed.
+ boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
+ ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
+ (tree.sym.flags() & PARAMETER) != 0;
+ chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
+
+ try {
+ v.getConstValue(); // ensure compile-time constant initializer is evaluated
+ deferredLintHandler.flush(tree.pos());
+ chk.checkDeprecatedAnnotation(tree.pos(), v);
+
+ if (tree.init != null) {
+ if ((v.flags_field & FINAL) == 0 ||
+ !memberEnter.needsLazyConstValue(tree.init)) {
+ // Not a compile-time constant
+ // Attribute initializer in a new environment
+ // with the declared variable as owner.
+ // Check that initializer conforms to variable's declared type.
+ Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
+ initEnv.info.lint = lint;
+ // In order to catch self-references, we set the variable's
+ // declaration position to maximal possible value, effectively
+ // marking the variable as undefined.
+ initEnv.info.enclVar = v;
+ attribExpr(tree.init, initEnv, v.type);
+ }
+ }
+ result = tree.type = v.type;
+ }
+ finally {
+ chk.setLint(prevLint);
+ }
+ }
+
+ public void visitSkip(JCSkip tree) {
+ result = null;
+ }
+
+ public void visitBlock(JCBlock tree) {
+ if (env.info.scope.owner.kind == TYP) {
+ // Block is a static or instance initializer;
+ // let the owner of the environment be a freshly
+ // created BLOCK-method.
+ Symbol fakeOwner =
+ new MethodSymbol(tree.flags | BLOCK |
+ env.info.scope.owner.flags() & STRICTFP, names.empty, null,
+ env.info.scope.owner);
+ final Env<AttrContext> localEnv =
+ env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
+
+ if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
+ // Attribute all type annotations in the block
+ annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
+ annotate.flush();
+ attribStats(tree.stats, localEnv);
+
+ {
+ // Store init and clinit type annotations with the ClassSymbol
+ // to allow output in Gen.normalizeDefs.
+ ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
+ List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
+ if ((tree.flags & STATIC) != 0) {
+ cs.appendClassInitTypeAttributes(tas);
+ } else {
+ cs.appendInitTypeAttributes(tas);
+ }
+ }
+ } else {
+ // Create a new local environment with a local scope.
+ Env<AttrContext> localEnv =
+ env.dup(tree, env.info.dup(env.info.scope.dup()));
+ try {
+ attribStats(tree.stats, localEnv);
+ } finally {
+ localEnv.info.scope.leave();
+ }
+ }
+ result = null;
+ }
+
+ public void visitDoLoop(JCDoWhileLoop tree) {
+ attribStat(tree.body, env.dup(tree));
+ attribExpr(tree.cond, env, syms.booleanType);
+ result = null;
+ }
+
+ public void visitWhileLoop(JCWhileLoop tree) {
+ attribExpr(tree.cond, env, syms.booleanType);
+ attribStat(tree.body, env.dup(tree));
+ result = null;
+ }
+
+ public void visitForLoop(JCForLoop tree) {
+ Env<AttrContext> loopEnv =
+ env.dup(env.tree, env.info.dup(env.info.scope.dup()));
+ try {
+ attribStats(tree.init, loopEnv);
+ if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
+ loopEnv.tree = tree; // before, we were not in loop!
+ attribStats(tree.step, loopEnv);
+ attribStat(tree.body, loopEnv);
+ result = null;
+ }
+ finally {
+ loopEnv.info.scope.leave();
+ }
+ }
+
+ public void visitForeachLoop(JCEnhancedForLoop tree) {
+ Env<AttrContext> loopEnv =
+ env.dup(env.tree, env.info.dup(env.info.scope.dup()));
+ try {
+ //the Formal Parameter of a for-each loop is not in the scope when
+ //attributing the for-each expression; we mimick this by attributing
+ //the for-each expression first (against original scope).
+ Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
+ attribStat(tree.var, loopEnv);
+ chk.checkNonVoid(tree.pos(), exprType);
+ Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
+ if (elemtype == null) {
+ // or perhaps expr implements Iterable<T>?
+ Type base = types.asSuper(exprType, syms.iterableType.tsym);
+ if (base == null) {
+ log.error(tree.expr.pos(),
+ Errors.ForeachNotApplicableToType(exprType,
+ Fragments.TypeReqArrayOrIterable));
+ elemtype = types.createErrorType(exprType);
+ } else {
+ List<Type> iterableParams = base.allparams();
+ elemtype = iterableParams.isEmpty()
+ ? syms.objectType
+ : types.wildUpperBound(iterableParams.head);
+ }
+ }
+ chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
+ loopEnv.tree = tree; // before, we were not in loop!
+ attribStat(tree.body, loopEnv);
+ result = null;
+ }
+ finally {
+ loopEnv.info.scope.leave();
+ }
+ }
+
+ public void visitLabelled(JCLabeledStatement tree) {
+ // Check that label is not used in an enclosing statement
+ Env<AttrContext> env1 = env;
+ while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
+ if (env1.tree.hasTag(LABELLED) &&
+ ((JCLabeledStatement) env1.tree).label == tree.label) {
+ log.error(tree.pos(),
+ Errors.LabelAlreadyInUse(tree.label));
+ break;
+ }
+ env1 = env1.next;
+ }
+
+ attribStat(tree.body, env.dup(tree));
+ result = null;
+ }
+
+ public void visitSwitch(JCSwitch tree) {
+ Type seltype = attribExpr(tree.selector, env);
+
+ Env<AttrContext> switchEnv =
+ env.dup(tree, env.info.dup(env.info.scope.dup()));
+
+ try {
+
+ boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
+ boolean stringSwitch = types.isSameType(seltype, syms.stringType);
+ if (stringSwitch && !allowStringsInSwitch) {
+ log.error(DiagnosticFlag.SOURCE_LEVEL, tree.selector.pos(), Errors.StringSwitchNotSupportedInSource(sourceName));
+ }
+ if (!enumSwitch && !stringSwitch)
+ seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
+
+ // Attribute all cases and
+ // check that there are no duplicate case labels or default clauses.
+ Set<Object> labels = new HashSet<>(); // The set of case labels.
+ boolean hasDefault = false; // Is there a default label?
+ for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
+ JCCase c = l.head;
+ if (c.pat != null) {
+ if (enumSwitch) {
+ Symbol sym = enumConstant(c.pat, seltype);
+ if (sym == null) {
+ log.error(c.pat.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
+ } else if (!labels.add(sym)) {
+ log.error(c.pos(), Errors.DuplicateCaseLabel);
+ }
+ } else {
+ Type pattype = attribExpr(c.pat, switchEnv, seltype);
+ if (!pattype.hasTag(ERROR)) {
+ if (pattype.constValue() == null) {
+ log.error(c.pat.pos(),
+ (stringSwitch ? "string.const.req" : "const.expr.req"));
+ } else if (!labels.add(pattype.constValue())) {
+ log.error(c.pos(), Errors.DuplicateCaseLabel);
+ }
+ }
+ }
+ } else if (hasDefault) {
+ log.error(c.pos(), Errors.DuplicateDefaultLabel);
+ } else {
+ hasDefault = true;
+ }
+ Env<AttrContext> caseEnv =
+ switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
+ try {
+ attribStats(c.stats, caseEnv);
+ } finally {
+ caseEnv.info.scope.leave();
+ addVars(c.stats, switchEnv.info.scope);
+ }
+ }
+
+ result = null;
+ }
+ finally {
+ switchEnv.info.scope.leave();
+ }
+ }
+ // where
+ /** Add any variables defined in stats to the switch scope. */
+ private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
+ for (;stats.nonEmpty(); stats = stats.tail) {
+ JCTree stat = stats.head;
+ if (stat.hasTag(VARDEF))
+ switchScope.enter(((JCVariableDecl) stat).sym);
+ }
+ }
+ // where
+ /** Return the selected enumeration constant symbol, or null. */
+ private Symbol enumConstant(JCTree tree, Type enumType) {
+ if (tree.hasTag(IDENT)) {
+ JCIdent ident = (JCIdent)tree;
+ Name name = ident.name;
+ for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
+ if (sym.kind == VAR) {
+ Symbol s = ident.sym = sym;
+ ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
+ ident.type = s.type;
+ return ((s.flags_field & Flags.ENUM) == 0)
+ ? null : s;
+ }
+ }
+ }
+ return null;
+ }
+
+ public void visitSynchronized(JCSynchronized tree) {
+ chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
+ attribStat(tree.body, env);
+ result = null;
+ }
+
+ public void visitTry(JCTry tree) {
+ // Create a new local environment with a local
+ Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
+ try {
+ boolean isTryWithResource = tree.resources.nonEmpty();
+ // Create a nested environment for attributing the try block if needed
+ Env<AttrContext> tryEnv = isTryWithResource ?
+ env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
+ localEnv;
+ try {
+ // Attribute resource declarations
+ for (JCTree resource : tree.resources) {
+ CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
+ @Override
+ public void report(DiagnosticPosition pos, JCDiagnostic details) {
+ chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
+ }
+ };
+ ResultInfo twrResult =
+ new ResultInfo(KindSelector.VAR,
+ syms.autoCloseableType,
+ twrContext);
+ if (resource.hasTag(VARDEF)) {
+ attribStat(resource, tryEnv);
+ twrResult.check(resource, resource.type);
+
+ //check that resource type cannot throw InterruptedException
+ checkAutoCloseable(resource.pos(), localEnv, resource.type);
+
+ VarSymbol var = ((JCVariableDecl) resource).sym;
+ var.setData(ElementKind.RESOURCE_VARIABLE);
+ } else {
+ attribTree(resource, tryEnv, twrResult);
+ }
+ }
+ // Attribute body
+ attribStat(tree.body, tryEnv);
+ } finally {
+ if (isTryWithResource)
+ tryEnv.info.scope.leave();
+ }
+
+ // Attribute catch clauses
+ for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
+ JCCatch c = l.head;
+ Env<AttrContext> catchEnv =
+ localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
+ try {
+ Type ctype = attribStat(c.param, catchEnv);
+ if (TreeInfo.isMultiCatch(c)) {
+ //multi-catch parameter is implicitly marked as final
+ c.param.sym.flags_field |= FINAL | UNION;
+ }
+ if (c.param.sym.kind == VAR) {
+ c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
+ }
+ chk.checkType(c.param.vartype.pos(),
+ chk.checkClassType(c.param.vartype.pos(), ctype),
+ syms.throwableType);
+ attribStat(c.body, catchEnv);
+ } finally {
+ catchEnv.info.scope.leave();
+ }
+ }
+
+ // Attribute finalizer
+ if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
+ result = null;
+ }
+ finally {
+ localEnv.info.scope.leave();
+ }
+ }
+
+ void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
+ if (!resource.isErroneous() &&
+ types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
+ !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
+ Symbol close = syms.noSymbol;
+ Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
+ try {
+ close = rs.resolveQualifiedMethod(pos,
+ env,
+ types.skipTypeVars(resource, false),
+ names.close,
+ List.nil(),
+ List.nil());
+ }
+ finally {
+ log.popDiagnosticHandler(discardHandler);
+ }
+ if (close.kind == MTH &&
+ close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
+ chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
+ env.info.lint.isEnabled(LintCategory.TRY)) {
+ log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
+ }
+ }
+ }
+
+ public void visitConditional(JCConditional tree) {
+ Type condtype = attribExpr(tree.cond, env, syms.booleanType);
+
+ tree.polyKind = (!allowPoly ||
+ pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
+ isBooleanOrNumeric(env, tree)) ?
+ PolyKind.STANDALONE : PolyKind.POLY;
+
+ if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
+ //this means we are returning a poly conditional from void-compatible lambda expression
+ resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
+ result = tree.type = types.createErrorType(resultInfo.pt);
+ return;
+ }
+
+ ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
+ unknownExprInfo :
+ resultInfo.dup(conditionalContext(resultInfo.checkContext));
+
+ Type truetype = attribTree(tree.truepart, env, condInfo);
+ Type falsetype = attribTree(tree.falsepart, env, condInfo);
+
+ Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
+ if (condtype.constValue() != null &&
+ truetype.constValue() != null &&
+ falsetype.constValue() != null &&
+ !owntype.hasTag(NONE)) {
+ //constant folding
+ owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
+ }
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ }
+ //where
+ private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
+ switch (tree.getTag()) {
+ case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
+ ((JCLiteral)tree).typetag == BOOLEAN ||
+ ((JCLiteral)tree).typetag == BOT;
+ case LAMBDA: case REFERENCE: return false;
+ case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
+ case CONDEXPR:
+ JCConditional condTree = (JCConditional)tree;
+ return isBooleanOrNumeric(env, condTree.truepart) &&
+ isBooleanOrNumeric(env, condTree.falsepart);
+ case APPLY:
+ JCMethodInvocation speculativeMethodTree =
+ (JCMethodInvocation)deferredAttr.attribSpeculative(
+ tree, env, unknownExprInfo,
+ argumentAttr.withLocalCacheContext());
+ Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
+ Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
+ env.enclClass.type :
+ ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
+ Type owntype = types.memberType(receiverType, msym).getReturnType();
+ return primitiveOrBoxed(owntype);
+ case NEWCLASS:
+ JCExpression className =
+ removeClassParams.translate(((JCNewClass)tree).clazz);
+ JCExpression speculativeNewClassTree =
+ (JCExpression)deferredAttr.attribSpeculative(
+ className, env, unknownTypeInfo,
+ argumentAttr.withLocalCacheContext());
+ return primitiveOrBoxed(speculativeNewClassTree.type);
+ default:
+ Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
+ argumentAttr.withLocalCacheContext()).type;
+ return primitiveOrBoxed(speculativeType);
+ }
+ }
+ //where
+ boolean primitiveOrBoxed(Type t) {
+ return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive());
+ }
+
+ TreeTranslator removeClassParams = new TreeTranslator() {
+ @Override
+ public void visitTypeApply(JCTypeApply tree) {
+ result = translate(tree.clazz);
+ }
+ };
+
+ CheckContext conditionalContext(CheckContext checkContext) {
+ return new Check.NestedCheckContext(checkContext) {
+ //this will use enclosing check context to check compatibility of
+ //subexpression against target type; if we are in a method check context,
+ //depending on whether boxing is allowed, we could have incompatibilities
+ @Override
+ public void report(DiagnosticPosition pos, JCDiagnostic details) {
+ enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
+ }
+ };
+ }
+
+ /** Compute the type of a conditional expression, after
+ * checking that it exists. See JLS 15.25. Does not take into
+ * account the special case where condition and both arms
+ * are constants.
+ *
+ * @param pos The source position to be used for error
+ * diagnostics.
+ * @param thentype The type of the expression's then-part.
+ * @param elsetype The type of the expression's else-part.
+ */
+ Type condType(DiagnosticPosition pos,
+ Type thentype, Type elsetype) {
+ // If same type, that is the result
+ if (types.isSameType(thentype, elsetype))
+ return thentype.baseType();
+
+ Type thenUnboxed = (thentype.isPrimitive())
+ ? thentype : types.unboxedType(thentype);
+ Type elseUnboxed = (elsetype.isPrimitive())
+ ? elsetype : types.unboxedType(elsetype);
+
+ // Otherwise, if both arms can be converted to a numeric
+ // type, return the least numeric type that fits both arms
+ // (i.e. return larger of the two, or return int if one
+ // arm is short, the other is char).
+ if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
+ // If one arm has an integer subrange type (i.e., byte,
+ // short, or char), and the other is an integer constant
+ // that fits into the subrange, return the subrange type.
+ if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
+ elseUnboxed.hasTag(INT) &&
+ types.isAssignable(elseUnboxed, thenUnboxed)) {
+ return thenUnboxed.baseType();
+ }
+ if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
+ thenUnboxed.hasTag(INT) &&
+ types.isAssignable(thenUnboxed, elseUnboxed)) {
+ return elseUnboxed.baseType();
+ }
+
+ for (TypeTag tag : primitiveTags) {
+ Type candidate = syms.typeOfTag[tag.ordinal()];
+ if (types.isSubtype(thenUnboxed, candidate) &&
+ types.isSubtype(elseUnboxed, candidate)) {
+ return candidate;
+ }
+ }
+ }
+
+ // Those were all the cases that could result in a primitive
+ if (thentype.isPrimitive())
+ thentype = types.boxedClass(thentype).type;
+ if (elsetype.isPrimitive())
+ elsetype = types.boxedClass(elsetype).type;
+
+ if (types.isSubtype(thentype, elsetype))
+ return elsetype.baseType();
+ if (types.isSubtype(elsetype, thentype))
+ return thentype.baseType();
+
+ if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
+ log.error(pos,
+ Errors.NeitherConditionalSubtype(thentype,
+ elsetype));
+ return thentype.baseType();
+ }
+
+ // both are known to be reference types. The result is
+ // lub(thentype,elsetype). This cannot fail, as it will
+ // always be possible to infer "Object" if nothing better.
+ return types.lub(thentype.baseType(), elsetype.baseType());
+ }
+
+ final static TypeTag[] primitiveTags = new TypeTag[]{
+ BYTE,
+ CHAR,
+ SHORT,
+ INT,
+ LONG,
+ FLOAT,
+ DOUBLE,
+ BOOLEAN,
+ };
+
+ public void visitIf(JCIf tree) {
+ attribExpr(tree.cond, env, syms.booleanType);
+ attribStat(tree.thenpart, env);
+ if (tree.elsepart != null)
+ attribStat(tree.elsepart, env);
+ chk.checkEmptyIf(tree);
+ result = null;
+ }
+
+ public void visitExec(JCExpressionStatement tree) {
+ //a fresh environment is required for 292 inference to work properly ---
+ //see Infer.instantiatePolymorphicSignatureInstance()
+ Env<AttrContext> localEnv = env.dup(tree);
+ attribExpr(tree.expr, localEnv);
+ result = null;
+ }
+
+ public void visitBreak(JCBreak tree) {
+ tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
+ result = null;
+ }
+
+ public void visitContinue(JCContinue tree) {
+ tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
+ result = null;
+ }
+ //where
+ /** Return the target of a break or continue statement, if it exists,
+ * report an error if not.
+ * Note: The target of a labelled break or continue is the
+ * (non-labelled) statement tree referred to by the label,
+ * not the tree representing the labelled statement itself.
+ *
+ * @param pos The position to be used for error diagnostics
+ * @param tag The tag of the jump statement. This is either
+ * Tree.BREAK or Tree.CONTINUE.
+ * @param label The label of the jump statement, or null if no
+ * label is given.
+ * @param env The environment current at the jump statement.
+ */
+ private JCTree findJumpTarget(DiagnosticPosition pos,
+ JCTree.Tag tag,
+ Name label,
+ Env<AttrContext> env) {
+ // Search environments outwards from the point of jump.
+ Env<AttrContext> env1 = env;
+ LOOP:
+ while (env1 != null) {
+ switch (env1.tree.getTag()) {
+ case LABELLED:
+ JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
+ if (label == labelled.label) {
+ // If jump is a continue, check that target is a loop.
+ if (tag == CONTINUE) {
+ if (!labelled.body.hasTag(DOLOOP) &&
+ !labelled.body.hasTag(WHILELOOP) &&
+ !labelled.body.hasTag(FORLOOP) &&
+ !labelled.body.hasTag(FOREACHLOOP))
+ log.error(pos, Errors.NotLoopLabel(label));
+ // Found labelled statement target, now go inwards
+ // to next non-labelled tree.
+ return TreeInfo.referencedStatement(labelled);
+ } else {
+ return labelled;
+ }
+ }
+ break;
+ case DOLOOP:
+ case WHILELOOP:
+ case FORLOOP:
+ case FOREACHLOOP:
+ if (label == null) return env1.tree;
+ break;
+ case SWITCH:
+ if (label == null && tag == BREAK) return env1.tree;
+ break;
+ case LAMBDA:
+ case METHODDEF:
+ case CLASSDEF:
+ break LOOP;
+ default:
+ }
+ env1 = env1.next;
+ }
+ if (label != null)
+ log.error(pos, Errors.UndefLabel(label));
+ else if (tag == CONTINUE)
+ log.error(pos, Errors.ContOutsideLoop);
+ else
+ log.error(pos, Errors.BreakOutsideSwitchLoop);
+ return null;
+ }
+
+ public void visitReturn(JCReturn tree) {
+ // Check that there is an enclosing method which is
+ // nested within than the enclosing class.
+ if (env.info.returnResult == null) {
+ log.error(tree.pos(), Errors.RetOutsideMeth);
+ } else {
+ // Attribute return expression, if it exists, and check that
+ // it conforms to result type of enclosing method.
+ if (tree.expr != null) {
+ if (env.info.returnResult.pt.hasTag(VOID)) {
+ env.info.returnResult.checkContext.report(tree.expr.pos(),
+ diags.fragment(Fragments.UnexpectedRetVal));
+ }
+ attribTree(tree.expr, env, env.info.returnResult);
+ } else if (!env.info.returnResult.pt.hasTag(VOID) &&
+ !env.info.returnResult.pt.hasTag(NONE)) {
+ env.info.returnResult.checkContext.report(tree.pos(),
+ diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
+ }
+ }
+ result = null;
+ }
+
+ public void visitThrow(JCThrow tree) {
+ Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
+ if (allowPoly) {
+ chk.checkType(tree, owntype, syms.throwableType);
+ }
+ result = null;
+ }
+
+ public void visitAssert(JCAssert tree) {
+ attribExpr(tree.cond, env, syms.booleanType);
+ if (tree.detail != null) {
+ chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
+ }
+ result = null;
+ }
+
+ /** Visitor method for method invocations.
+ * NOTE: The method part of an application will have in its type field
+ * the return type of the method, not the method's type itself!
+ */
+ public void visitApply(JCMethodInvocation tree) {
+ // The local environment of a method application is
+ // a new environment nested in the current one.
+ Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
+
+ // The types of the actual method arguments.
+ List<Type> argtypes;
+
+ // The types of the actual method type arguments.
+ List<Type> typeargtypes = null;
+
+ Name methName = TreeInfo.name(tree.meth);
+
+ boolean isConstructorCall =
+ methName == names._this || methName == names._super;
+
+ ListBuffer<Type> argtypesBuf = new ListBuffer<>();
+ if (isConstructorCall) {
+ // We are seeing a ...this(...) or ...super(...) call.
+ // Check that this is the first statement in a constructor.
+ if (checkFirstConstructorStat(tree, env)) {
+
+ // Record the fact
+ // that this is a constructor call (using isSelfCall).
+ localEnv.info.isSelfCall = true;
+
+ // Attribute arguments, yielding list of argument types.
+ KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
+ argtypes = argtypesBuf.toList();
+ typeargtypes = attribTypes(tree.typeargs, localEnv);
+
+ // Variable `site' points to the class in which the called
+ // constructor is defined.
+ Type site = env.enclClass.sym.type;
+ if (methName == names._super) {
+ if (site == syms.objectType) {
+ log.error(tree.meth.pos(), Errors.NoSuperclass(site));
+ site = types.createErrorType(syms.objectType);
+ } else {
+ site = types.supertype(site);
+ }
+ }
+
+ if (site.hasTag(CLASS)) {
+ Type encl = site.getEnclosingType();
+ while (encl != null && encl.hasTag(TYPEVAR))
+ encl = encl.getUpperBound();
+ if (encl.hasTag(CLASS)) {
+ // we are calling a nested class
+
+ if (tree.meth.hasTag(SELECT)) {
+ JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
+
+ // We are seeing a prefixed call, of the form
+ // <expr>.super(...).
+ // Check that the prefix expression conforms
+ // to the outer instance type of the class.
+ chk.checkRefType(qualifier.pos(),
+ attribExpr(qualifier, localEnv,
+ encl));
+ } else if (methName == names._super) {
+ // qualifier omitted; check for existence
+ // of an appropriate implicit qualifier.
+ rs.resolveImplicitThis(tree.meth.pos(),
+ localEnv, site, true);
+ }
+ } else if (tree.meth.hasTag(SELECT)) {
+ log.error(tree.meth.pos(),
+ Errors.IllegalQualNotIcls(site.tsym));
+ }
+
+ // if we're calling a java.lang.Enum constructor,
+ // prefix the implicit String and int parameters
+ if (site.tsym == syms.enumSym)
+ argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
+
+ // Resolve the called constructor under the assumption
+ // that we are referring to a superclass instance of the
+ // current instance (JLS ???).
+ boolean selectSuperPrev = localEnv.info.selectSuper;
+ localEnv.info.selectSuper = true;
+ localEnv.info.pendingResolutionPhase = null;
+ Symbol sym = rs.resolveConstructor(
+ tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
+ localEnv.info.selectSuper = selectSuperPrev;
+
+ // Set method symbol to resolved constructor...
+ TreeInfo.setSymbol(tree.meth, sym);
+
+ // ...and check that it is legal in the current context.
+ // (this will also set the tree's type)
+ Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
+ checkId(tree.meth, site, sym, localEnv,
+ new ResultInfo(kind, mpt));
+ }
+ // Otherwise, `site' is an error type and we do nothing
+ }
+ result = tree.type = syms.voidType;
+ } else {
+ // Otherwise, we are seeing a regular method call.
+ // Attribute the arguments, yielding list of argument types, ...
+ KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
+ argtypes = argtypesBuf.toList();
+ typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
+
+ // ... and attribute the method using as a prototype a methodtype
+ // whose formal argument types is exactly the list of actual
+ // arguments (this will also set the method symbol).
+ Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
+ localEnv.info.pendingResolutionPhase = null;
+ Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
+
+ // Compute the result type.
+ Type restype = mtype.getReturnType();
+ if (restype.hasTag(WILDCARD))
+ throw new AssertionError(mtype);
+
+ Type qualifier = (tree.meth.hasTag(SELECT))
+ ? ((JCFieldAccess) tree.meth).selected.type
+ : env.enclClass.sym.type;
+ Symbol msym = TreeInfo.symbol(tree.meth);
+ restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
+
+ chk.checkRefTypes(tree.typeargs, typeargtypes);
+
+ // Check that value of resulting type is admissible in the
+ // current context. Also, capture the return type
+ Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
+ result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
+ }
+ chk.validate(tree.typeargs, localEnv);
+ }
+ //where
+ Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
+ if (msym != null &&
+ msym.owner == syms.objectType.tsym &&
+ methodName == names.getClass &&
+ argtypes.isEmpty()) {
+ // as a special case, x.getClass() has type Class<? extends |X|>
+ return new ClassType(restype.getEnclosingType(),
+ List.of(new WildcardType(types.erasure(qualifierType),
+ BoundKind.EXTENDS,
+ syms.boundClass)),
+ restype.tsym,
+ restype.getMetadata());
+ } else if (msym != null &&
+ msym.owner == syms.arrayClass &&
+ methodName == names.clone &&
+ types.isArray(qualifierType)) {
+ // as a special case, array.clone() has a result that is
+ // the same as static type of the array being cloned
+ return qualifierType;
+ } else {
+ return restype;
+ }
+ }
+
+ /** Check that given application node appears as first statement
+ * in a constructor call.
+ * @param tree The application node
+ * @param env The environment current at the application.
+ */
+ boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
+ JCMethodDecl enclMethod = env.enclMethod;
+ if (enclMethod != null && enclMethod.name == names.init) {
+ JCBlock body = enclMethod.body;
+ if (body.stats.head.hasTag(EXEC) &&
+ ((JCExpressionStatement) body.stats.head).expr == tree)
+ return true;
+ }
+ log.error(tree.pos(),
+ Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
+ return false;
+ }
+
+ /** Obtain a method type with given argument types.
+ */
+ Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
+ MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
+ return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
+ }
+
+ public void visitNewClass(final JCNewClass tree) {
+ Type owntype = types.createErrorType(tree.type);
+
+ // The local environment of a class creation is
+ // a new environment nested in the current one.
+ Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
+
+ // The anonymous inner class definition of the new expression,
+ // if one is defined by it.
+ JCClassDecl cdef = tree.def;
+
+ // If enclosing class is given, attribute it, and
+ // complete class name to be fully qualified
+ JCExpression clazz = tree.clazz; // Class field following new
+ JCExpression clazzid; // Identifier in class field
+ JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
+ annoclazzid = null;
+
+ if (clazz.hasTag(TYPEAPPLY)) {
+ clazzid = ((JCTypeApply) clazz).clazz;
+ if (clazzid.hasTag(ANNOTATED_TYPE)) {
+ annoclazzid = (JCAnnotatedType) clazzid;
+ clazzid = annoclazzid.underlyingType;
+ }
+ } else {
+ if (clazz.hasTag(ANNOTATED_TYPE)) {
+ annoclazzid = (JCAnnotatedType) clazz;
+ clazzid = annoclazzid.underlyingType;
+ } else {
+ clazzid = clazz;
+ }
+ }
+
+ JCExpression clazzid1 = clazzid; // The same in fully qualified form
+
+ if (tree.encl != null) {
+ // We are seeing a qualified new, of the form
+ // <expr>.new C <...> (...) ...
+ // In this case, we let clazz stand for the name of the
+ // allocated class C prefixed with the type of the qualifier
+ // expression, so that we can
+ // resolve it with standard techniques later. I.e., if
+ // <expr> has type T, then <expr>.new C <...> (...)
+ // yields a clazz T.C.
+ Type encltype = chk.checkRefType(tree.encl.pos(),
+ attribExpr(tree.encl, env));
+ // TODO 308: in <expr>.new C, do we also want to add the type annotations
+ // from expr to the combined type, or not? Yes, do this.
+ clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
+ ((JCIdent) clazzid).name);
+
+ EndPosTable endPosTable = this.env.toplevel.endPositions;
+ endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
+ if (clazz.hasTag(ANNOTATED_TYPE)) {
+ JCAnnotatedType annoType = (JCAnnotatedType) clazz;
+ List<JCAnnotation> annos = annoType.annotations;
+
+ if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
+ clazzid1 = make.at(tree.pos).
+ TypeApply(clazzid1,
+ ((JCTypeApply) clazz).arguments);
+ }
+
+ clazzid1 = make.at(tree.pos).
+ AnnotatedType(annos, clazzid1);
+ } else if (clazz.hasTag(TYPEAPPLY)) {
+ clazzid1 = make.at(tree.pos).
+ TypeApply(clazzid1,
+ ((JCTypeApply) clazz).arguments);
+ }
+
+ clazz = clazzid1;
+ }
+
+ // Attribute clazz expression and store
+ // symbol + type back into the attributed tree.
+ Type clazztype;
+
+ try {
+ env.info.isNewClass = true;
+ clazztype = TreeInfo.isEnumInit(env.tree) ?
+ attribIdentAsEnumType(env, (JCIdent)clazz) :
+ attribType(clazz, env);
+ } finally {
+ env.info.isNewClass = false;
+ }
+
+ clazztype = chk.checkDiamond(tree, clazztype);
+ chk.validate(clazz, localEnv);
+ if (tree.encl != null) {
+ // We have to work in this case to store
+ // symbol + type back into the attributed tree.
+ tree.clazz.type = clazztype;
+ TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
+ clazzid.type = ((JCIdent) clazzid).sym.type;
+ if (annoclazzid != null) {
+ annoclazzid.type = clazzid.type;
+ }
+ if (!clazztype.isErroneous()) {
+ if (cdef != null && clazztype.tsym.isInterface()) {
+ log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
+ } else if (clazztype.tsym.isStatic()) {
+ log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
+ }
+ }
+ } else if (!clazztype.tsym.isInterface() &&
+ clazztype.getEnclosingType().hasTag(CLASS)) {
+ // Check for the existence of an apropos outer instance
+ rs.resolveImplicitThis(tree.pos(), env, clazztype);
+ }
+
+ // Attribute constructor arguments.
+ ListBuffer<Type> argtypesBuf = new ListBuffer<>();
+ final KindSelector pkind =
+ attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
+ List<Type> argtypes = argtypesBuf.toList();
+ List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
+
+ // If we have made no mistakes in the class type...
+ if (clazztype.hasTag(CLASS)) {
+ // Enums may not be instantiated except implicitly
+ if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
+ (!env.tree.hasTag(VARDEF) ||
+ (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
+ ((JCVariableDecl) env.tree).init != tree))
+ log.error(tree.pos(), Errors.EnumCantBeInstantiated);
+
+ boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
+ resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
+ boolean skipNonDiamondPath = false;
+ // Check that class is not abstract
+ if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
+ (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
+ log.error(tree.pos(),
+ Errors.AbstractCantBeInstantiated(clazztype.tsym));
+ skipNonDiamondPath = true;
+ } else if (cdef != null && clazztype.tsym.isInterface()) {
+ // Check that no constructor arguments are given to
+ // anonymous classes implementing an interface
+ if (!argtypes.isEmpty())
+ log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
+
+ if (!typeargtypes.isEmpty())
+ log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
+
+ // Error recovery: pretend no arguments were supplied.
+ argtypes = List.nil();
+ typeargtypes = List.nil();
+ skipNonDiamondPath = true;
+ }
+ if (TreeInfo.isDiamond(tree)) {
+ ClassType site = new ClassType(clazztype.getEnclosingType(),
+ clazztype.tsym.type.getTypeArguments(),
+ clazztype.tsym,
+ clazztype.getMetadata());
+
+ Env<AttrContext> diamondEnv = localEnv.dup(tree);
+ diamondEnv.info.selectSuper = cdef != null;
+ diamondEnv.info.pendingResolutionPhase = null;
+
+ //if the type of the instance creation expression is a class type
+ //apply method resolution inference (JLS 15.12.2.7). The return type
+ //of the resolved constructor will be a partially instantiated type
+ Symbol constructor = rs.resolveDiamond(tree.pos(),
+ diamondEnv,
+ site,
+ argtypes,
+ typeargtypes);
+ tree.constructor = constructor.baseSymbol();
+
+ final TypeSymbol csym = clazztype.tsym;
+ ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
+ diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
+ Type constructorType = tree.constructorType = types.createErrorType(clazztype);
+ constructorType = checkId(tree, site,
+ constructor,
+ diamondEnv,
+ diamondResult);
+
+ tree.clazz.type = types.createErrorType(clazztype);
+ if (!constructorType.isErroneous()) {
+ tree.clazz.type = clazz.type = constructorType.getReturnType();
+ tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
+ }
+ clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
+ }
+
+ // Resolve the called constructor under the assumption
+ // that we are referring to a superclass instance of the
+ // current instance (JLS ???).
+ else if (!skipNonDiamondPath) {
+ //the following code alters some of the fields in the current
+ //AttrContext - hence, the current context must be dup'ed in
+ //order to avoid downstream failures
+ Env<AttrContext> rsEnv = localEnv.dup(tree);
+ rsEnv.info.selectSuper = cdef != null;
+ rsEnv.info.pendingResolutionPhase = null;
+ tree.constructor = rs.resolveConstructor(
+ tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
+ if (cdef == null) { //do not check twice!
+ tree.constructorType = checkId(tree,
+ clazztype,
+ tree.constructor,
+ rsEnv,
+ new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
+ if (rsEnv.info.lastResolveVarargs())
+ Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
+ }
+ }
+
+ if (cdef != null) {
+ visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
+ return;
+ }
+
+ if (tree.constructor != null && tree.constructor.kind == MTH)
+ owntype = clazztype;
+ }
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
+ if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
+ //we need to wait for inference to finish and then replace inference vars in the constructor type
+ inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
+ instantiatedContext -> {
+ tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
+ });
+ }
+ chk.validate(tree.typeargs, localEnv);
+ }
+
+ // where
+ private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
+ JCClassDecl cdef, Env<AttrContext> localEnv,
+ List<Type> argtypes, List<Type> typeargtypes,
+ KindSelector pkind) {
+ // We are seeing an anonymous class instance creation.
+ // In this case, the class instance creation
+ // expression
+ //
+ // E.new <typeargs1>C<typargs2>(args) { ... }
+ //
+ // is represented internally as
+ //
+ // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
+ //
+ // This expression is then *transformed* as follows:
+ //
+ // (1) add an extends or implements clause
+ // (2) add a constructor.
+ //
+ // For instance, if C is a class, and ET is the type of E,
+ // the expression
+ //
+ // E.new <typeargs1>C<typargs2>(args) { ... }
+ //
+ // is translated to (where X is a fresh name and typarams is the
+ // parameter list of the super constructor):
+ //
+ // new <typeargs1>X(<*nullchk*>E, args) where
+ // X extends C<typargs2> {
+ // <typarams> X(ET e, args) {
+ // e.<typeargs1>super(args)
+ // }
+ // ...
+ // }
+ InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
+ final boolean isDiamond = TreeInfo.isDiamond(tree);
+ if (isDiamond
+ && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
+ || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
+ final ResultInfo resultInfoForClassDefinition = this.resultInfo;
+ inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
+ instantiatedContext -> {
+ tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
+ tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
+ ResultInfo prevResult = this.resultInfo;
+ try {
+ this.resultInfo = resultInfoForClassDefinition;
+ visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
+ localEnv, argtypes, typeargtypes, pkind);
+ } finally {
+ this.resultInfo = prevResult;
+ }
+ });
+ } else {
+ if (isDiamond && clazztype.hasTag(CLASS)) {
+ List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
+ if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
+ // One or more types inferred in the previous steps is non-denotable.
+ Fragment fragment = Diamond(clazztype.tsym);
+ log.error(tree.clazz.pos(),
+ Errors.CantApplyDiamond1(
+ fragment,
+ invalidDiamondArgs.size() > 1 ?
+ DiamondInvalidArgs(invalidDiamondArgs, fragment) :
+ DiamondInvalidArg(invalidDiamondArgs, fragment)));
+ }
+ // For <>(){}, inferred types must also be accessible.
+ for (Type t : clazztype.getTypeArguments()) {
+ rs.checkAccessibleType(env, t);
+ }
+ }
+
+ // If we already errored, be careful to avoid a further avalanche. ErrorType answers
+ // false for isInterface call even when the original type is an interface.
+ boolean implementing = clazztype.tsym.isInterface() ||
+ clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface();
+
+ if (implementing) {
+ cdef.implementing = List.of(clazz);
+ } else {
+ cdef.extending = clazz;
+ }
+
+ if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
+ isSerializable(clazztype)) {
+ localEnv.info.isSerializable = true;
+ }
+
+ attribStat(cdef, localEnv);
+
+ List<Type> finalargtypes;
+ // If an outer instance is given,
+ // prefix it to the constructor arguments
+ // and delete it from the new expression
+ if (tree.encl != null && !clazztype.tsym.isInterface()) {
+ tree.args = tree.args.prepend(makeNullCheck(tree.encl));
+ finalargtypes = argtypes.prepend(tree.encl.type);
+ tree.encl = null;
+ } else {
+ finalargtypes = argtypes;
+ }
+
+ // Reassign clazztype and recompute constructor. As this necessarily involves
+ // another attribution pass for deferred types in the case of <>, replicate
+ // them. Original arguments have right decorations already.
+ if (isDiamond && pkind.contains(KindSelector.POLY)) {
+ finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
+ }
+
+ clazztype = cdef.sym.type;
+ Symbol sym = tree.constructor = rs.resolveConstructor(
+ tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
+ Assert.check(!sym.kind.isResolutionError());
+ tree.constructor = sym;
+ tree.constructorType = checkId(tree,
+ clazztype,
+ tree.constructor,
+ localEnv,
+ new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
+ }
+ Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
+ clazztype : types.createErrorType(tree.type);
+ result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
+ chk.validate(tree.typeargs, localEnv);
+ }
+
+ CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
+ return new Check.NestedCheckContext(checkContext) {
+ @Override
+ public void report(DiagnosticPosition _unused, JCDiagnostic details) {
+ enclosingContext.report(clazz.clazz,
+ diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
+ }
+ };
+ }
+
+ /** Make an attributed null check tree.
+ */
+ public JCExpression makeNullCheck(JCExpression arg) {
+ // optimization: new Outer() can never be null; skip null check
+ if (arg.getTag() == NEWCLASS)
+ return arg;
+ // optimization: X.this is never null; skip null check
+ Name name = TreeInfo.name(arg);
+ if (name == names._this || name == names._super) return arg;
+
+ JCTree.Tag optag = NULLCHK;
+ JCUnary tree = make.at(arg.pos).Unary(optag, arg);
+ tree.operator = operators.resolveUnary(arg, optag, arg.type);
+ tree.type = arg.type;
+ return tree;
+ }
+
+ public void visitNewArray(JCNewArray tree) {
+ Type owntype = types.createErrorType(tree.type);
+ Env<AttrContext> localEnv = env.dup(tree);
+ Type elemtype;
+ if (tree.elemtype != null) {
+ elemtype = attribType(tree.elemtype, localEnv);
+ chk.validate(tree.elemtype, localEnv);
+ owntype = elemtype;
+ for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
+ attribExpr(l.head, localEnv, syms.intType);
+ owntype = new ArrayType(owntype, syms.arrayClass);
+ }
+ } else {
+ // we are seeing an untyped aggregate { ... }
+ // this is allowed only if the prototype is an array
+ if (pt().hasTag(ARRAY)) {
+ elemtype = types.elemtype(pt());
+ } else {
+ if (!pt().hasTag(ERROR)) {
+ log.error(tree.pos(),
+ Errors.IllegalInitializerForType(pt()));
+ }
+ elemtype = types.createErrorType(pt());
+ }
+ }
+ if (tree.elems != null) {
+ attribExprs(tree.elems, localEnv, elemtype);
+ owntype = new ArrayType(elemtype, syms.arrayClass);
+ }
+ if (!types.isReifiable(elemtype))
+ log.error(tree.pos(), Errors.GenericArrayCreation);
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ }
+
+ /*
+ * A lambda expression can only be attributed when a target-type is available.
+ * In addition, if the target-type is that of a functional interface whose
+ * descriptor contains inference variables in argument position the lambda expression
+ * is 'stuck' (see DeferredAttr).
+ */
+ @Override
+ public void visitLambda(final JCLambda that) {
+ if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
+ if (pt().hasTag(NONE)) {
+ //lambda only allowed in assignment or method invocation/cast context
+ log.error(that.pos(), Errors.UnexpectedLambda);
+ }
+ result = that.type = types.createErrorType(pt());
+ return;
+ }
+ //create an environment for attribution of the lambda expression
+ final Env<AttrContext> localEnv = lambdaEnv(that, env);
+ boolean needsRecovery =
+ resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
+ try {
+ if (needsRecovery && isSerializable(pt())) {
+ localEnv.info.isSerializable = true;
+ localEnv.info.isLambda = true;
+ }
+ List<Type> explicitParamTypes = null;
+ if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
+ //attribute lambda parameters
+ attribStats(that.params, localEnv);
+ explicitParamTypes = TreeInfo.types(that.params);
+ }
+
+ TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
+ Type currentTarget = targetInfo.target;
+ Type lambdaType = targetInfo.descriptor;
+
+ if (currentTarget.isErroneous()) {
+ result = that.type = currentTarget;
+ return;
+ }
+
+ setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
+
+ if (lambdaType.hasTag(FORALL)) {
+ //lambda expression target desc cannot be a generic method
+ Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
+ kindName(currentTarget.tsym),
+ currentTarget.tsym);
+ resultInfo.checkContext.report(that, diags.fragment(msg));
+ result = that.type = types.createErrorType(pt());
+ return;
+ }
+
+ if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
+ //add param type info in the AST
+ List<Type> actuals = lambdaType.getParameterTypes();
+ List<JCVariableDecl> params = that.params;
+
+ boolean arityMismatch = false;
+
+ while (params.nonEmpty()) {
+ if (actuals.isEmpty()) {
+ //not enough actuals to perform lambda parameter inference
+ arityMismatch = true;
+ }
+ //reset previously set info
+ Type argType = arityMismatch ?
+ syms.errType :
+ actuals.head;
+ params.head.vartype = make.at(params.head).Type(argType);
+ params.head.sym = null;
+ actuals = actuals.isEmpty() ?
+ actuals :
+ actuals.tail;
+ params = params.tail;
+ }
+
+ //attribute lambda parameters
+ attribStats(that.params, localEnv);
+
+ if (arityMismatch) {
+ resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
+ result = that.type = types.createErrorType(currentTarget);
+ return;
+ }
+ }
+
+ //from this point on, no recovery is needed; if we are in assignment context
+ //we will be able to attribute the whole lambda body, regardless of errors;
+ //if we are in a 'check' method context, and the lambda is not compatible
+ //with the target-type, it will be recovered anyway in Attr.checkId
+ needsRecovery = false;
+
+ ResultInfo bodyResultInfo = localEnv.info.returnResult =
+ lambdaBodyResult(that, lambdaType, resultInfo);
+
+ if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
+ attribTree(that.getBody(), localEnv, bodyResultInfo);
+ } else {
+ JCBlock body = (JCBlock)that.body;
+ attribStats(body.stats, localEnv);
+ }
+
+ result = check(that, currentTarget, KindSelector.VAL, resultInfo);
+
+ boolean isSpeculativeRound =
+ resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
+
+ preFlow(that);
+ flow.analyzeLambda(env, that, make, isSpeculativeRound);
+
+ that.type = currentTarget; //avoids recovery at this stage
+ checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
+
+ if (!isSpeculativeRound) {
+ //add thrown types as bounds to the thrown types free variables if needed:
+ if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
+ List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
+ if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
+ log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
+ }
+ }
+
+ checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
+ }
+ result = check(that, currentTarget, KindSelector.VAL, resultInfo);
+ } catch (Types.FunctionDescriptorLookupError ex) {
+ JCDiagnostic cause = ex.getDiagnostic();
+ resultInfo.checkContext.report(that, cause);
+ result = that.type = types.createErrorType(pt());
+ return;
+ } catch (Throwable t) {
+ //when an unexpected exception happens, avoid attempts to attribute the same tree again
+ //as that would likely cause the same exception again.
+ needsRecovery = false;
+ throw t;
+ } finally {
+ localEnv.info.scope.leave();
+ if (needsRecovery) {
+ attribTree(that, env, recoveryInfo);
+ }
+ }
+ }
+ //where
+ class TargetInfo {
+ Type target;
+ Type descriptor;
+
+ public TargetInfo(Type target, Type descriptor) {
+ this.target = target;
+ this.descriptor = descriptor;
+ }
+ }
+
+ TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
+ Type lambdaType;
+ Type currentTarget = resultInfo.pt;
+ if (resultInfo.pt != Type.recoveryType) {
+ /* We need to adjust the target. If the target is an
+ * intersection type, for example: SAM & I1 & I2 ...
+ * the target will be updated to SAM
+ */
+ currentTarget = targetChecker.visit(currentTarget, that);
+ if (explicitParamTypes != null) {
+ currentTarget = infer.instantiateFunctionalInterface(that,
+ currentTarget, explicitParamTypes, resultInfo.checkContext);
+ }
+ currentTarget = types.removeWildcards(currentTarget);
+ lambdaType = types.findDescriptorType(currentTarget);
+ } else {
+ currentTarget = Type.recoveryType;
+ lambdaType = fallbackDescriptorType(that);
+ }
+ if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
+ //lambda expression target desc cannot be a generic method
+ Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
+ kindName(currentTarget.tsym),
+ currentTarget.tsym);
+ resultInfo.checkContext.report(that, diags.fragment(msg));
+ currentTarget = types.createErrorType(pt());
+ }
+ return new TargetInfo(currentTarget, lambdaType);
+ }
+
+ void preFlow(JCLambda tree) {
+ new PostAttrAnalyzer() {
+ @Override
+ public void scan(JCTree tree) {
+ if (tree == null ||
+ (tree.type != null &&
+ tree.type == Type.stuckType)) {
+ //don't touch stuck expressions!
+ return;
+ }
+ super.scan(tree);
+ }
+ }.scan(tree);
+ }
+
+ Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
+
+ @Override
+ public Type visitClassType(ClassType t, DiagnosticPosition pos) {
+ return t.isIntersection() ?
+ visitIntersectionClassType((IntersectionClassType)t, pos) : t;
+ }
+
+ public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
+ Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
+ Type target = null;
+ for (Type bound : ict.getExplicitComponents()) {
+ TypeSymbol boundSym = bound.tsym;
+ if (types.isFunctionalInterface(boundSym) &&
+ types.findDescriptorSymbol(boundSym) == desc) {
+ target = bound;
+ } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
+ //bound must be an interface
+ reportIntersectionError(pos, "not.an.intf.component", boundSym);
+ }
+ }
+ return target != null ?
+ target :
+ ict.getExplicitComponents().head; //error recovery
+ }
+
+ private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
+ ListBuffer<Type> targs = new ListBuffer<>();
+ ListBuffer<Type> supertypes = new ListBuffer<>();
+ for (Type i : ict.interfaces_field) {
+ if (i.isParameterized()) {
+ targs.appendList(i.tsym.type.allparams());
+ }
+ supertypes.append(i.tsym.type);
+ }
+ IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
+ notionalIntf.allparams_field = targs.toList();
+ notionalIntf.tsym.flags_field |= INTERFACE;
+ return notionalIntf.tsym;
+ }
+
+ private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
+ resultInfo.checkContext.report(pos,
+ diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
+ }
+ };
+
+ private Type fallbackDescriptorType(JCExpression tree) {
+ switch (tree.getTag()) {
+ case LAMBDA:
+ JCLambda lambda = (JCLambda)tree;
+ List<Type> argtypes = List.nil();
+ for (JCVariableDecl param : lambda.params) {
+ argtypes = param.vartype != null ?
+ argtypes.append(param.vartype.type) :
+ argtypes.append(syms.errType);
+ }
+ return new MethodType(argtypes, Type.recoveryType,
+ List.of(syms.throwableType), syms.methodClass);
+ case REFERENCE:
+ return new MethodType(List.nil(), Type.recoveryType,
+ List.of(syms.throwableType), syms.methodClass);
+ default:
+ Assert.error("Cannot get here!");
+ }
+ return null;
+ }
+
+ private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
+ final InferenceContext inferenceContext, final Type... ts) {
+ checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
+ }
+
+ private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
+ final InferenceContext inferenceContext, final List<Type> ts) {
+ if (inferenceContext.free(ts)) {
+ inferenceContext.addFreeTypeListener(ts,
+ solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
+ } else {
+ for (Type t : ts) {
+ rs.checkAccessibleType(env, t);
+ }
+ }
+ }
+
+ /**
+ * Lambda/method reference have a special check context that ensures
+ * that i.e. a lambda return type is compatible with the expected
+ * type according to both the inherited context and the assignment
+ * context.
+ */
+ class FunctionalReturnContext extends Check.NestedCheckContext {
+
+ FunctionalReturnContext(CheckContext enclosingContext) {
+ super(enclosingContext);
+ }
+
+ @Override
+ public boolean compatible(Type found, Type req, Warner warn) {
+ //return type must be compatible in both current context and assignment context
+ return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
+ }
+
+ @Override
+ public void report(DiagnosticPosition pos, JCDiagnostic details) {
+ enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
+ }
+ }
+
+ class ExpressionLambdaReturnContext extends FunctionalReturnContext {
+
+ JCExpression expr;
+ boolean expStmtExpected;
+
+ ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
+ super(enclosingContext);
+ this.expr = expr;
+ }
+
+ @Override
+ public void report(DiagnosticPosition pos, JCDiagnostic details) {
+ if (expStmtExpected) {
+ enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
+ } else {
+ super.report(pos, details);
+ }
+ }
+
+ @Override
+ public boolean compatible(Type found, Type req, Warner warn) {
+ //a void return is compatible with an expression statement lambda
+ if (req.hasTag(VOID)) {
+ expStmtExpected = true;
+ return TreeInfo.isExpressionStatement(expr);
+ } else {
+ return super.compatible(found, req, warn);
+ }
+ }
+ }
+
+ ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
+ FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
+ new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
+ new FunctionalReturnContext(resultInfo.checkContext);
+
+ return descriptor.getReturnType() == Type.recoveryType ?
+ recoveryInfo :
+ new ResultInfo(KindSelector.VAL,
+ descriptor.getReturnType(), funcContext);
+ }
+
+ /**
+ * Lambda compatibility. Check that given return types, thrown types, parameter types
+ * are compatible with the expected functional interface descriptor. This means that:
+ * (i) parameter types must be identical to those of the target descriptor; (ii) return
+ * types must be compatible with the return type of the expected descriptor.
+ */
+ void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
+ Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
+
+ //return values have already been checked - but if lambda has no return
+ //values, we must ensure that void/value compatibility is correct;
+ //this amounts at checking that, if a lambda body can complete normally,
+ //the descriptor's return type must be void
+ if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
+ !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
+ Fragment msg =
+ Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
+ checkContext.report(tree,
+ diags.fragment(msg));
+ }
+
+ List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
+ if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
+ checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
+ }
+ }
+
+ /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
+ * static field and that lambda has type annotations, these annotations will
+ * also be stored at these fake clinit methods.
+ *
+ * LambdaToMethod also use fake clinit methods so they can be reused.
+ * Also as LTM is a phase subsequent to attribution, the methods from
+ * clinits can be safely removed by LTM to save memory.
+ */
+ private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
+
+ public MethodSymbol removeClinit(ClassSymbol sym) {
+ return clinits.remove(sym);
+ }
+
+ /* This method returns an environment to be used to attribute a lambda
+ * expression.
+ *
+ * The owner of this environment is a method symbol. If the current owner
+ * is not a method, for example if the lambda is used to initialize
+ * a field, then if the field is:
+ *
+ * - an instance field, we use the first constructor.
+ * - a static field, we create a fake clinit method.
+ */
+ public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
+ Env<AttrContext> lambdaEnv;
+ Symbol owner = env.info.scope.owner;
+ if (owner.kind == VAR && owner.owner.kind == TYP) {
+ //field initializer
+ ClassSymbol enclClass = owner.enclClass();
+ Symbol newScopeOwner = env.info.scope.owner;
+ /* if the field isn't static, then we can get the first constructor
+ * and use it as the owner of the environment. This is what
+ * LTM code is doing to look for type annotations so we are fine.
+ */
+ if ((owner.flags() & STATIC) == 0) {
+ for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
+ newScopeOwner = s;
+ break;
+ }
+ } else {
+ /* if the field is static then we need to create a fake clinit
+ * method, this method can later be reused by LTM.
+ */
+ MethodSymbol clinit = clinits.get(enclClass);
+ if (clinit == null) {
+ Type clinitType = new MethodType(List.nil(),
+ syms.voidType, List.nil(), syms.methodClass);
+ clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
+ names.clinit, clinitType, enclClass);
+ clinit.params = List.nil();
+ clinits.put(enclClass, clinit);
+ }
+ newScopeOwner = clinit;
+ }
+ lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
+ } else {
+ lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
+ }
+ return lambdaEnv;
+ }
+
+ @Override
+ public void visitReference(final JCMemberReference that) {
+ if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
+ if (pt().hasTag(NONE)) {
+ //method reference only allowed in assignment or method invocation/cast context
+ log.error(that.pos(), Errors.UnexpectedMref);
+ }
+ result = that.type = types.createErrorType(pt());
+ return;
+ }
+ final Env<AttrContext> localEnv = env.dup(that);
+ try {
+ //attribute member reference qualifier - if this is a constructor
+ //reference, the expected kind must be a type
+ Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
+
+ if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
+ exprType = chk.checkConstructorRefType(that.expr, exprType);
+ if (!exprType.isErroneous() &&
+ exprType.isRaw() &&
+ that.typeargs != null) {
+ log.error(that.expr.pos(),
+ Errors.InvalidMref(Kinds.kindName(that.getMode()),
+ Fragments.MrefInferAndExplicitParams));
+ exprType = types.createErrorType(exprType);
+ }
+ }
+
+ if (exprType.isErroneous()) {
+ //if the qualifier expression contains problems,
+ //give up attribution of method reference
+ result = that.type = exprType;
+ return;
+ }
+
+ if (TreeInfo.isStaticSelector(that.expr, names)) {
+ //if the qualifier is a type, validate it; raw warning check is
+ //omitted as we don't know at this stage as to whether this is a
+ //raw selector (because of inference)
+ chk.validate(that.expr, env, false);
+ } else {
+ Symbol lhsSym = TreeInfo.symbol(that.expr);
+ localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
+ }
+ //attrib type-arguments
+ List<Type> typeargtypes = List.nil();
+ if (that.typeargs != null) {
+ typeargtypes = attribTypes(that.typeargs, localEnv);
+ }
+
+ boolean isTargetSerializable =
+ resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
+ isSerializable(pt());
+ TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
+ Type currentTarget = targetInfo.target;
+ Type desc = targetInfo.descriptor;
+
+ setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
+ List<Type> argtypes = desc.getParameterTypes();
+ Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
+
+ if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
+ referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
+ }
+
+ Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
+ List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
+ try {
+ refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
+ that.name, argtypes, typeargtypes, referenceCheck,
+ resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
+ } finally {
+ resultInfo.checkContext.inferenceContext().rollback(saved_undet);
+ }
+
+ Symbol refSym = refResult.fst;
+ Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
+
+ /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
+ * JDK-8075541
+ */
+ if (refSym.kind != MTH) {
+ boolean targetError;
+ switch (refSym.kind) {
+ case ABSENT_MTH:
+ case MISSING_ENCL:
+ targetError = false;
+ break;
+ case WRONG_MTH:
+ case WRONG_MTHS:
+ case AMBIGUOUS:
+ case HIDDEN:
+ case STATICERR:
+ targetError = true;
+ break;
+ default:
+ Assert.error("unexpected result kind " + refSym.kind);
+ targetError = false;
+ }
+
+ JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
+ that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
+
+ JCDiagnostic.DiagnosticType diagKind = targetError ?
+ JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
+
+ JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
+ "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
+
+ if (targetError && currentTarget == Type.recoveryType) {
+ //a target error doesn't make sense during recovery stage
+ //as we don't know what actual parameter types are
+ result = that.type = currentTarget;
+ return;
+ } else {
+ if (targetError) {
+ resultInfo.checkContext.report(that, diag);
+ } else {
+ log.report(diag);
+ }
+ result = that.type = types.createErrorType(currentTarget);
+ return;
+ }
+ }
+
+ that.sym = refSym.baseSymbol();
+ that.kind = lookupHelper.referenceKind(that.sym);
+ that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
+
+ if (desc.getReturnType() == Type.recoveryType) {
+ // stop here
+ result = that.type = currentTarget;
+ return;
+ }
+
+ if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
+ Type enclosingType = exprType.getEnclosingType();
+ if (enclosingType != null && enclosingType.hasTag(CLASS)) {
+ // Check for the existence of an apropriate outer instance
+ rs.resolveImplicitThis(that.pos(), env, exprType);
+ }
+ }
+
+ if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
+
+ if (that.getMode() == ReferenceMode.INVOKE &&
+ TreeInfo.isStaticSelector(that.expr, names) &&
+ that.kind.isUnbound() &&
+ !desc.getParameterTypes().head.isParameterized()) {
+ chk.checkRaw(that.expr, localEnv);
+ }
+
+ if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
+ exprType.getTypeArguments().nonEmpty()) {
+ //static ref with class type-args
+ log.error(that.expr.pos(),
+ Errors.InvalidMref(Kinds.kindName(that.getMode()),
+ Fragments.StaticMrefWithTargs));
+ result = that.type = types.createErrorType(currentTarget);
+ return;
+ }
+
+ if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
+ // Check that super-qualified symbols are not abstract (JLS)
+ rs.checkNonAbstract(that.pos(), that.sym);
+ }
+
+ if (isTargetSerializable) {
+ chk.checkAccessFromSerializableElement(that, true);
+ }
+ }
+
+ ResultInfo checkInfo =
+ resultInfo.dup(newMethodTemplate(
+ desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
+ that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
+ new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
+
+ Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
+
+ if (that.kind.isUnbound() &&
+ resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
+ //re-generate inference constraints for unbound receiver
+ if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
+ //cannot happen as this has already been checked - we just need
+ //to regenerate the inference constraints, as that has been lost
+ //as a result of the call to inferenceContext.save()
+ Assert.error("Can't get here");
+ }
+ }
+
+ if (!refType.isErroneous()) {
+ refType = types.createMethodTypeWithReturn(refType,
+ adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
+ }
+
+ //go ahead with standard method reference compatibility check - note that param check
+ //is a no-op (as this has been taken care during method applicability)
+ boolean isSpeculativeRound =
+ resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
+
+ that.type = currentTarget; //avoids recovery at this stage
+ checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
+ if (!isSpeculativeRound) {
+ checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
+ }
+ result = check(that, currentTarget, KindSelector.VAL, resultInfo);
+ } catch (Types.FunctionDescriptorLookupError ex) {
+ JCDiagnostic cause = ex.getDiagnostic();
+ resultInfo.checkContext.report(that, cause);
+ result = that.type = types.createErrorType(pt());
+ return;
+ }
+ }
+ //where
+ ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
+ //if this is a constructor reference, the expected kind must be a type
+ return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
+ KindSelector.VAL_TYP : KindSelector.TYP,
+ Type.noType);
+ }
+
+
+ @SuppressWarnings("fallthrough")
+ void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
+ InferenceContext inferenceContext = checkContext.inferenceContext();
+ Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
+
+ Type resType;
+ switch (tree.getMode()) {
+ case NEW:
+ if (!tree.expr.type.isRaw()) {
+ resType = tree.expr.type;
+ break;
+ }
+ default:
+ resType = refType.getReturnType();
+ }
+
+ Type incompatibleReturnType = resType;
+
+ if (returnType.hasTag(VOID)) {
+ incompatibleReturnType = null;
+ }
+
+ if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
+ if (resType.isErroneous() ||
+ new FunctionalReturnContext(checkContext).compatible(resType, returnType,
+ checkContext.checkWarner(tree, resType, returnType))) {
+ incompatibleReturnType = null;
+ }
+ }
+
+ if (incompatibleReturnType != null) {
+ Fragment msg =
+ Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
+ checkContext.report(tree, diags.fragment(msg));
+ } else {
+ if (inferenceContext.free(refType)) {
+ // we need to wait for inference to finish and then replace inference vars in the referent type
+ inferenceContext.addFreeTypeListener(List.of(refType),
+ instantiatedContext -> {
+ tree.referentType = instantiatedContext.asInstType(refType);
+ });
+ } else {
+ tree.referentType = refType;
+ }
+ }
+
+ if (!speculativeAttr) {
+ if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
+ log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
+ }
+ }
+ }
+
+ boolean checkExConstraints(
+ List<Type> thrownByFuncExpr,
+ List<Type> thrownAtFuncType,
+ InferenceContext inferenceContext) {
+ /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
+ * are not proper types
+ */
+ List<Type> nonProperList = thrownAtFuncType.stream()
+ .filter(e -> inferenceContext.free(e)).collect(List.collector());
+ List<Type> properList = thrownAtFuncType.diff(nonProperList);
+
+ /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
+ * in the throws clause of the invocation type of the method reference's compile-time
+ * declaration
+ */
+ List<Type> checkedList = thrownByFuncExpr.stream()
+ .filter(e -> chk.isChecked(e)).collect(List.collector());
+
+ /** If n = 0 (the function type's throws clause consists only of proper types), then
+ * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
+ * in the throws clause, the constraint reduces to false; otherwise, the constraint
+ * reduces to true
+ */
+ ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
+ for (Type checked : checkedList) {
+ boolean isSubtype = false;
+ for (Type proper : properList) {
+ if (types.isSubtype(checked, proper)) {
+ isSubtype = true;
+ break;
+ }
+ }
+ if (!isSubtype) {
+ uncaughtByProperTypes.add(checked);
+ }
+ }
+
+ if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
+ return false;
+ }
+
+ /** If n > 0, the constraint reduces to a set of subtyping constraints:
+ * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
+ * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
+ */
+ List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
+ uncaughtByProperTypes.forEach(checkedEx -> {
+ nonProperAsUndet.forEach(nonProper -> {
+ types.isSubtype(checkedEx, nonProper);
+ });
+ });
+
+ /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
+ */
+ nonProperAsUndet.stream()
+ .filter(t -> t.hasTag(UNDETVAR))
+ .forEach(t -> ((UndetVar)t).setThrow());
+ return true;
+ }
+
+ /**
+ * Set functional type info on the underlying AST. Note: as the target descriptor
+ * might contain inference variables, we might need to register an hook in the
+ * current inference context.
+ */
+ private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
+ final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
+ if (checkContext.inferenceContext().free(descriptorType)) {
+ checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
+ inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
+ inferenceContext.asInstType(primaryTarget), checkContext));
+ } else {
+ ListBuffer<Type> targets = new ListBuffer<>();
+ if (pt.hasTag(CLASS)) {
+ if (pt.isCompound()) {
+ targets.append(types.removeWildcards(primaryTarget)); //this goes first
+ for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
+ if (t != primaryTarget) {
+ targets.append(types.removeWildcards(t));
+ }
+ }
+ } else {
+ targets.append(types.removeWildcards(primaryTarget));
+ }
+ }
+ fExpr.targets = targets.toList();
+ if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
+ pt != Type.recoveryType) {
+ //check that functional interface class is well-formed
+ try {
+ /* Types.makeFunctionalInterfaceClass() may throw an exception
+ * when it's executed post-inference. See the listener code
+ * above.
+ */
+ ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
+ names.empty, List.of(fExpr.targets.head), ABSTRACT);
+ if (csym != null) {
+ chk.checkImplementations(env.tree, csym, csym);
+ try {
+ //perform an additional functional interface check on the synthetic class,
+ //as there may be spurious errors for raw targets - because of existing issues
+ //with membership and inheritance (see JDK-8074570).
+ csym.flags_field |= INTERFACE;
+ types.findDescriptorType(csym.type);
+ } catch (FunctionDescriptorLookupError err) {
+ resultInfo.checkContext.report(fExpr,
+ diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head)));
+ }
+ }
+ } catch (Types.FunctionDescriptorLookupError ex) {
+ JCDiagnostic cause = ex.getDiagnostic();
+ resultInfo.checkContext.report(env.tree, cause);
+ }
+ }
+ }
+ }
+
+ public void visitParens(JCParens tree) {
+ Type owntype = attribTree(tree.expr, env, resultInfo);
+ result = check(tree, owntype, pkind(), resultInfo);
+ Symbol sym = TreeInfo.symbol(tree);
+ if (sym != null && sym.kind.matches(KindSelector.TYP_PCK))
+ log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
+ }
+
+ public void visitAssign(JCAssign tree) {
+ Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
+ Type capturedType = capture(owntype);
+ attribExpr(tree.rhs, env, owntype);
+ result = check(tree, capturedType, KindSelector.VAL, resultInfo);
+ }
+
+ public void visitAssignop(JCAssignOp tree) {
+ // Attribute arguments.
+ Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
+ Type operand = attribExpr(tree.rhs, env);
+ // Find operator.
+ Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
+ if (operator != operators.noOpSymbol &&
+ !owntype.isErroneous() &&
+ !operand.isErroneous()) {
+ chk.checkDivZero(tree.rhs.pos(), operator, operand);
+ chk.checkCastable(tree.rhs.pos(),
+ operator.type.getReturnType(),
+ owntype);
+ }
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ }
+
+ public void visitUnary(JCUnary tree) {
+ // Attribute arguments.
+ Type argtype = (tree.getTag().isIncOrDecUnaryOp())
+ ? attribTree(tree.arg, env, varAssignmentInfo)
+ : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
+
+ // Find operator.
+ Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
+ Type owntype = types.createErrorType(tree.type);
+ if (operator != operators.noOpSymbol &&
+ !argtype.isErroneous()) {
+ owntype = (tree.getTag().isIncOrDecUnaryOp())
+ ? tree.arg.type
+ : operator.type.getReturnType();
+ int opc = ((OperatorSymbol)operator).opcode;
+
+ // If the argument is constant, fold it.
+ if (argtype.constValue() != null) {
+ Type ctype = cfolder.fold1(opc, argtype);
+ if (ctype != null) {
+ owntype = cfolder.coerce(ctype, owntype);
+ }
+ }
+ }
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ }
+
+ public void visitBinary(JCBinary tree) {
+ // Attribute arguments.
+ Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
+ Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env));
+ // Find operator.
+ Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
+ Type owntype = types.createErrorType(tree.type);
+ if (operator != operators.noOpSymbol &&
+ !left.isErroneous() &&
+ !right.isErroneous()) {
+ owntype = operator.type.getReturnType();
+ int opc = ((OperatorSymbol)operator).opcode;
+ // If both arguments are constants, fold them.
+ if (left.constValue() != null && right.constValue() != null) {
+ Type ctype = cfolder.fold2(opc, left, right);
+ if (ctype != null) {
+ owntype = cfolder.coerce(ctype, owntype);
+ }
+ }
+
+ // Check that argument types of a reference ==, != are
+ // castable to each other, (JLS 15.21). Note: unboxing
+ // comparisons will not have an acmp* opc at this point.
+ if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
+ if (!types.isCastable(left, right, new Warner(tree.pos()))) {
+ log.error(tree.pos(), Errors.IncomparableTypes(left, right));
+ }
+ }
+
+ chk.checkDivZero(tree.rhs.pos(), operator, right);
+ }
+ result = check(tree, owntype, KindSelector.VAL, resultInfo);
+ }
+
+ public void visitTypeCast(final JCTypeCast tree) {
+ Type clazztype = attribType(tree.clazz, env);
+ chk.validate(tree.clazz, env, false);
+ //a fresh environment is required for 292 inference to work properly ---
+ //see Infer.instantiatePolymorphicSignatureInstance()
+ Env<AttrContext> localEnv = env.dup(tree);
+ //should we propagate the target type?
+ final ResultInfo castInfo;
+ JCExpression expr = TreeInfo.skipParens(tree.expr);
+ boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
+ if (isPoly) {
+ //expression is a poly - we need to propagate target type info
+ castInfo = new ResultInfo(KindSelector.VAL, clazztype,
+ new Check.NestedCheckContext(resultInfo.checkContext) {
+ @Override
+ public boolean compatible(Type found, Type req, Warner warn) {
+ return types.isCastable(found, req, warn);
+ }
+ });
+ } else {
+ //standalone cast - target-type info is not propagated
+ castInfo = unknownExprInfo;
+ }
+ Type exprtype = attribTree(tree.expr, localEnv, castInfo);
+ Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
+ if (exprtype.constValue() != null)
+ owntype = cfolder.coerce(exprtype, owntype);
+ result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
+ if (!isPoly)
+ chk.checkRedundantCast(localEnv, tree);
+ }
+
+ public void visitTypeTest(JCInstanceOf tree) {
+ Type exprtype = chk.checkNullOrRefType(
+ tree.expr.pos(), attribExpr(tree.expr, env));
+ Type clazztype = attribType(tree.clazz, env);
+ if (!clazztype.hasTag(TYPEVAR)) {
+ clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
+ }
+ if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
+ log.error(tree.clazz.pos(), Errors.IllegalGenericTypeForInstof);
+ clazztype = types.createErrorType(clazztype);
+ }
+ chk.validate(tree.clazz, env, false);
+ chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
+ result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
+ }
+
+ public void visitIndexed(JCArrayAccess tree) {
+ Type owntype = types.createErrorType(tree.type);
+ Type atype = attribExpr(tree.indexed, env);
+ attribExpr(tree.index, env, syms.intType);
+ if (types.isArray(atype))
+ owntype = types.elemtype(atype);
+ else if (!atype.hasTag(ERROR))
+ log.error(tree.pos(), Errors.ArrayReqButFound(atype));
+ if (!pkind().contains(KindSelector.VAL))
+ owntype = capture(owntype);
+ result = check(tree, owntype, KindSelector.VAR, resultInfo);
+ }
+
+ public void visitIdent(JCIdent tree) {
+ Symbol sym;
+
+ // Find symbol
+ if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
+ // If we are looking for a method, the prototype `pt' will be a
+ // method type with the type of the call's arguments as parameters.
+ env.info.pendingResolutionPhase = null;
+ sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
+ } else if (tree.sym != null && tree.sym.kind != VAR) {
+ sym = tree.sym;
+ } else {
+ sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
+ }
+ tree.sym = sym;
+
+ // (1) Also find the environment current for the class where
+ // sym is defined (`symEnv').
+ // Only for pre-tiger versions (1.4 and earlier):
+ // (2) Also determine whether we access symbol out of an anonymous
+ // class in a this or super call. This is illegal for instance
+ // members since such classes don't carry a this$n link.
+ // (`noOuterThisPath').
+ Env<AttrContext> symEnv = env;
+ boolean noOuterThisPath = false;
+ if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
+ sym.kind.matches(KindSelector.VAL_MTH) &&
+ sym.owner.kind == TYP &&
+ tree.name != names._this && tree.name != names._super) {
+
+ // Find environment in which identifier is defined.
+ while (symEnv.outer != null &&
+ !sym.isMemberOf(symEnv.enclClass.sym, types)) {
+ if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
+ noOuterThisPath = false;
+ symEnv = symEnv.outer;
+ }
+ }
+
+ // If symbol is a variable, ...
+ if (sym.kind == VAR) {
+ VarSymbol v = (VarSymbol)sym;
+
+ // ..., evaluate its initializer, if it has one, and check for
+ // illegal forward reference.
+ checkInit(tree, env, v, false);
+
+ // If we are expecting a variable (as opposed to a value), check
+ // that the variable is assignable in the current environment.
+ if (KindSelector.ASG.subset(pkind()))
+ checkAssignable(tree.pos(), v, null, env);
+ }
+
+ // In a constructor body,
+ // if symbol is a field or instance method, check that it is
+ // not accessed before the supertype constructor is called.
+ if ((symEnv.info.isSelfCall || noOuterThisPath) &&
+ sym.kind.matches(KindSelector.VAL_MTH) &&
+ sym.owner.kind == TYP &&
+ (sym.flags() & STATIC) == 0) {
+ chk.earlyRefError(tree.pos(), sym.kind == VAR ?
+ sym : thisSym(tree.pos(), env));
+ }
+ Env<AttrContext> env1 = env;
+ if (sym.kind != ERR && sym.kind != TYP &&
+ sym.owner != null && sym.owner != env1.enclClass.sym) {
+ // If the found symbol is inaccessible, then it is
+ // accessed through an enclosing instance. Locate this
+ // enclosing instance:
+ while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
+ env1 = env1.outer;
+ }
+
+ if (env.info.isSerializable) {
+ chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
+ }
+
+ result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
+ }
+
+ public void visitSelect(JCFieldAccess tree) {
+ // Determine the expected kind of the qualifier expression.
+ KindSelector skind = KindSelector.NIL;
+ if (tree.name == names._this || tree.name == names._super ||
+ tree.name == names._class)
+ {
+ skind = KindSelector.TYP;
+ } else {
+ if (pkind().contains(KindSelector.PCK))
+ skind = KindSelector.of(skind, KindSelector.PCK);
+ if (pkind().contains(KindSelector.TYP))
+ skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
+ if (pkind().contains(KindSelector.VAL_MTH))
+ skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
+ }
+
+ // Attribute the qualifier expression, and determine its symbol (if any).
+ Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
+ if (!pkind().contains(KindSelector.TYP_PCK))
+ site = capture(site); // Capture field access
+
+ // don't allow T.class T[].class, etc
+ if (skind == KindSelector.TYP) {
+ Type elt = site;
+ while (elt.hasTag(ARRAY))
+ elt = ((ArrayType)elt).elemtype;
+ if (elt.hasTag(TYPEVAR)) {
+ log.error(tree.pos(), Errors.TypeVarCantBeDeref);
+ result = tree.type = types.createErrorType(tree.name, site.tsym, site);
+ tree.sym = tree.type.tsym;
+ return ;
+ }
+ }
+
+ // If qualifier symbol is a type or `super', assert `selectSuper'
+ // for the selection. This is relevant for determining whether
+ // protected symbols are accessible.
+ Symbol sitesym = TreeInfo.symbol(tree.selected);
+ boolean selectSuperPrev = env.info.selectSuper;
+ env.info.selectSuper =
+ sitesym != null &&
+ sitesym.name == names._super;
+
+ // Determine the symbol represented by the selection.
+ env.info.pendingResolutionPhase = null;
+ Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
+ if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
+ log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
+ sym = syms.errSymbol;
+ }
+ if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
+ site = capture(site);
+ sym = selectSym(tree, sitesym, site, env, resultInfo);
+ }
+ boolean varArgs = env.info.lastResolveVarargs();
+ tree.sym = sym;
+
+ if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
+ site = types.skipTypeVars(site, true);
+ }
+
+ // If that symbol is a variable, ...
+ if (sym.kind == VAR) {
+ VarSymbol v = (VarSymbol)sym;
+
+ // ..., evaluate its initializer, if it has one, and check for
+ // illegal forward reference.
+ checkInit(tree, env, v, true);
+
+ // If we are expecting a variable (as opposed to a value), check
+ // that the variable is assignable in the current environment.
+ if (KindSelector.ASG.subset(pkind()))
+ checkAssignable(tree.pos(), v, tree.selected, env);
+ }
+
+ if (sitesym != null &&
+ sitesym.kind == VAR &&
+ ((VarSymbol)sitesym).isResourceVariable() &&
+ sym.kind == MTH &&
+ sym.name.equals(names.close) &&
+ sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
+ env.info.lint.isEnabled(LintCategory.TRY)) {
+ log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
+ }
+
+ // Disallow selecting a type from an expression
+ if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
+ tree.type = check(tree.selected, pt(),
+ sitesym == null ?
+ KindSelector.VAL : sitesym.kind.toSelector(),
+ new ResultInfo(KindSelector.TYP_PCK, pt()));
+ }
+
+ if (isType(sitesym)) {
+ if (sym.name == names._this) {
+ // If `C' is the currently compiled class, check that
+ // C.this' does not appear in a call to a super(...)
+ if (env.info.isSelfCall &&
+ site.tsym == env.enclClass.sym) {
+ chk.earlyRefError(tree.pos(), sym);
+ }
+ } else {
+ // Check if type-qualified fields or methods are static (JLS)
+ if ((sym.flags() & STATIC) == 0 &&
+ sym.name != names._super &&
+ (sym.kind == VAR || sym.kind == MTH)) {
+ rs.accessBase(rs.new StaticError(sym),
+ tree.pos(), site, sym.name, true);
+ }
+ }
+ if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
+ sym.isStatic() && sym.kind == MTH) {
+ log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Errors.StaticIntfMethodInvokeNotSupportedInSource(sourceName));
+ }
+ } else if (sym.kind != ERR &&
+ (sym.flags() & STATIC) != 0 &&
+ sym.name != names._class) {
+ // If the qualified item is not a type and the selected item is static, report
+ // a warning. Make allowance for the class of an array type e.g. Object[].class)
+ chk.warnStatic(tree, "static.not.qualified.by.type",
+ sym.kind.kindName(), sym.owner);
+ }
+
+ // If we are selecting an instance member via a `super', ...
+ if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
+
+ // Check that super-qualified symbols are not abstract (JLS)
+ rs.checkNonAbstract(tree.pos(), sym);
+
+ if (site.isRaw()) {
+ // Determine argument types for site.
+ Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
+ if (site1 != null) site = site1;
+ }
+ }
+
+ if (env.info.isSerializable) {
+ chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
+ }
+
+ env.info.selectSuper = selectSuperPrev;
+ result = checkId(tree, site, sym, env, resultInfo);
+ }
+ //where
+ /** Determine symbol referenced by a Select expression,
+ *
+ * @param tree The select tree.
+ * @param site The type of the selected expression,
+ * @param env The current environment.
+ * @param resultInfo The current result.
+ */
+ private Symbol selectSym(JCFieldAccess tree,
+ Symbol location,
+ Type site,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ DiagnosticPosition pos = tree.pos();
+ Name name = tree.name;
+ switch (site.getTag()) {
+ case PACKAGE:
+ return rs.accessBase(
+ rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
+ pos, location, site, name, true);
+ case ARRAY:
+ case CLASS:
+ if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
+ return rs.resolveQualifiedMethod(
+ pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
+ } else if (name == names._this || name == names._super) {
+ return rs.resolveSelf(pos, env, site.tsym, name);
+ } else if (name == names._class) {
+ // In this case, we have already made sure in
+ // visitSelect that qualifier expression is a type.
+ Type t = syms.classType;
+ List<Type> typeargs = List.of(types.erasure(site));
+ t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
+ return new VarSymbol(
+ STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
+ } else {
+ // We are seeing a plain identifier as selector.
+ Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
+ sym = rs.accessBase(sym, pos, location, site, name, true);
+ return sym;
+ }
+ case WILDCARD:
+ throw new AssertionError(tree);
+ case TYPEVAR:
+ // Normally, site.getUpperBound() shouldn't be null.
+ // It should only happen during memberEnter/attribBase
+ // when determining the super type which *must* beac
+ // done before attributing the type variables. In
+ // other words, we are seeing this illegal program:
+ // class B<T> extends A<T.foo> {}
+ Symbol sym = (site.getUpperBound() != null)
+ ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
+ : null;
+ if (sym == null) {
+ log.error(pos, Errors.TypeVarCantBeDeref);
+ return syms.errSymbol;
+ } else {
+ Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
+ rs.new AccessError(env, site, sym) :
+ sym;
+ rs.accessBase(sym2, pos, location, site, name, true);
+ return sym;
+ }
+ case ERROR:
+ // preserve identifier names through errors
+ return types.createErrorType(name, site.tsym, site).tsym;
+ default:
+ // The qualifier expression is of a primitive type -- only
+ // .class is allowed for these.
+ if (name == names._class) {
+ // In this case, we have already made sure in Select that
+ // qualifier expression is a type.
+ Type t = syms.classType;
+ Type arg = types.boxedClass(site).type;
+ t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
+ return new VarSymbol(
+ STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
+ } else {
+ log.error(pos, Errors.CantDeref(site));
+ return syms.errSymbol;
+ }
+ }
+ }
+
+ /** Determine type of identifier or select expression and check that
+ * (1) the referenced symbol is not deprecated
+ * (2) the symbol's type is safe (@see checkSafe)
+ * (3) if symbol is a variable, check that its type and kind are
+ * compatible with the prototype and protokind.
+ * (4) if symbol is an instance field of a raw type,
+ * which is being assigned to, issue an unchecked warning if its
+ * type changes under erasure.
+ * (5) if symbol is an instance method of a raw type, issue an
+ * unchecked warning if its argument types change under erasure.
+ * If checks succeed:
+ * If symbol is a constant, return its constant type
+ * else if symbol is a method, return its result type
+ * otherwise return its type.
+ * Otherwise return errType.
+ *
+ * @param tree The syntax tree representing the identifier
+ * @param site If this is a select, the type of the selected
+ * expression, otherwise the type of the current class.
+ * @param sym The symbol representing the identifier.
+ * @param env The current environment.
+ * @param resultInfo The expected result
+ */
+ Type checkId(JCTree tree,
+ Type site,
+ Symbol sym,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
+ checkMethodId(tree, site, sym, env, resultInfo) :
+ checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
+ }
+
+ Type checkMethodId(JCTree tree,
+ Type site,
+ Symbol sym,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ boolean isPolymorhicSignature =
+ (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
+ return isPolymorhicSignature ?
+ checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
+ checkMethodIdInternal(tree, site, sym, env, resultInfo);
+ }
+
+ Type checkSigPolyMethodId(JCTree tree,
+ Type site,
+ Symbol sym,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ //recover original symbol for signature polymorphic methods
+ checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
+ env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
+ return sym.type;
+ }
+
+ Type checkMethodIdInternal(JCTree tree,
+ Type site,
+ Symbol sym,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ if (resultInfo.pkind.contains(KindSelector.POLY)) {
+ Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
+ Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
+ resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
+ return owntype;
+ } else {
+ return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
+ }
+ }
+
+ Type checkIdInternal(JCTree tree,
+ Type site,
+ Symbol sym,
+ Type pt,
+ Env<AttrContext> env,
+ ResultInfo resultInfo) {
+ if (pt.isErroneous()) {
+ return types.createErrorType(site);
+ }
+ Type owntype; // The computed type of this identifier occurrence.
+ switch (sym.kind) {
+ case TYP:
+ // For types, the computed type equals the symbol's type,
+ // except for two situations:
+ owntype = sym.type;
+ if (owntype.hasTag(CLASS)) {
+ chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
+ Type ownOuter = owntype.getEnclosingType();
+
+ // (a) If the symbol's type is parameterized, erase it
+ // because no type parameters were given.
+ // We recover generic outer type later in visitTypeApply.
+ if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
+ owntype = types.erasure(owntype);
+ }
+
+ // (b) If the symbol's type is an inner class, then
+ // we have to interpret its outer type as a superclass
+ // of the site type. Example:
+ //
+ // class Tree<A> { class Visitor { ... } }
+ // class PointTree extends Tree<Point> { ... }
+ // ...PointTree.Visitor...
+ //
+ // Then the type of the last expression above is
+ // Tree<Point>.Visitor.
+ else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
+ Type normOuter = site;
+ if (normOuter.hasTag(CLASS)) {
+ normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
+ }
+ if (normOuter == null) // perhaps from an import
+ normOuter = types.erasure(ownOuter);
+ if (normOuter != ownOuter)
+ owntype = new ClassType(
+ normOuter, List.nil(), owntype.tsym,
+ owntype.getMetadata());
+ }
+ }
+ break;
+ case VAR:
+ VarSymbol v = (VarSymbol)sym;
+ // Test (4): if symbol is an instance field of a raw type,
+ // which is being assigned to, issue an unchecked warning if
+ // its type changes under erasure.
+ if (KindSelector.ASG.subset(pkind()) &&
+ v.owner.kind == TYP &&
+ (v.flags() & STATIC) == 0 &&
+ (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
+ Type s = types.asOuterSuper(site, v.owner);
+ if (s != null &&
+ s.isRaw() &&
+ !types.isSameType(v.type, v.erasure(types))) {
+ chk.warnUnchecked(tree.pos(),
+ "unchecked.assign.to.var",
+ v, s);
+ }
+ }
+ // The computed type of a variable is the type of the
+ // variable symbol, taken as a member of the site type.
+ owntype = (sym.owner.kind == TYP &&
+ sym.name != names._this && sym.name != names._super)
+ ? types.memberType(site, sym)
+ : sym.type;
+
+ // If the variable is a constant, record constant value in
+ // computed type.
+ if (v.getConstValue() != null && isStaticReference(tree))
+ owntype = owntype.constType(v.getConstValue());
+
+ if (resultInfo.pkind == KindSelector.VAL) {
+ owntype = capture(owntype); // capture "names as expressions"
+ }
+ break;
+ case MTH: {
+ owntype = checkMethod(site, sym,
+ new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
+ env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
+ resultInfo.pt.getTypeArguments());
+ break;
+ }
+ case PCK: case ERR:
+ owntype = sym.type;
+ break;
+ default:
+ throw new AssertionError("unexpected kind: " + sym.kind +
+ " in tree " + tree);
+ }
+
+ // Emit a `deprecation' warning if symbol is deprecated.
+ // (for constructors (but not for constructor references), the error
+ // was given when the constructor was resolved)
+
+ if (sym.name != names.init || tree.hasTag(REFERENCE)) {
+ chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
+ chk.checkSunAPI(tree.pos(), sym);
+ chk.checkProfile(tree.pos(), sym);
+ }
+
+ // If symbol is a variable, check that its type and
+ // kind are compatible with the prototype and protokind.
+ return check(tree, owntype, sym.kind.toSelector(), resultInfo);
+ }
+
+ /** Check that variable is initialized and evaluate the variable's
+ * initializer, if not yet done. Also check that variable is not
+ * referenced before it is defined.
+ * @param tree The tree making up the variable reference.
+ * @param env The current environment.
+ * @param v The variable's symbol.
+ */
+ private void checkInit(JCTree tree,
+ Env<AttrContext> env,
+ VarSymbol v,
+ boolean onlyWarning) {
+ // A forward reference is diagnosed if the declaration position
+ // of the variable is greater than the current tree position
+ // and the tree and variable definition occur in the same class
+ // definition. Note that writes don't count as references.
+ // This check applies only to class and instance
+ // variables. Local variables follow different scope rules,
+ // and are subject to definite assignment checking.
+ Env<AttrContext> initEnv = enclosingInitEnv(env);
+ if (initEnv != null &&
+ (initEnv.info.enclVar == v || v.pos > tree.pos) &&
+ v.owner.kind == TYP &&
+ v.owner == env.info.scope.owner.enclClass() &&
+ ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
+ (!env.tree.hasTag(ASSIGN) ||
+ TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
+ String suffix = (initEnv.info.enclVar == v) ?
+ "self.ref" : "forward.ref";
+ if (!onlyWarning || isStaticEnumField(v)) {
+ log.error(tree.pos(), "illegal." + suffix);
+ } else if (useBeforeDeclarationWarning) {
+ log.warning(tree.pos(), suffix, v);
+ }
+ }
+
+ v.getConstValue(); // ensure initializer is evaluated
+
+ checkEnumInitializer(tree, env, v);
+ }
+
+ /**
+ * Returns the enclosing init environment associated with this env (if any). An init env
+ * can be either a field declaration env or a static/instance initializer env.
+ */
+ Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
+ while (true) {
+ switch (env.tree.getTag()) {
+ case VARDEF:
+ JCVariableDecl vdecl = (JCVariableDecl)env.tree;
+ if (vdecl.sym.owner.kind == TYP) {
+ //field
+ return env;
+ }
+ break;
+ case BLOCK:
+ if (env.next.tree.hasTag(CLASSDEF)) {
+ //instance/static initializer
+ return env;
+ }
+ break;
+ case METHODDEF:
+ case CLASSDEF:
+ case TOPLEVEL:
+ return null;
+ }
+ Assert.checkNonNull(env.next);
+ env = env.next;
+ }
+ }
+
+ /**
+ * Check for illegal references to static members of enum. In
+ * an enum type, constructors and initializers may not
+ * reference its static members unless they are constant.
+ *
+ * @param tree The tree making up the variable reference.
+ * @param env The current environment.
+ * @param v The variable's symbol.
+ * @jls section 8.9 Enums
+ */
+ private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
+ // JLS:
+ //
+ // "It is a compile-time error to reference a static field
+ // of an enum type that is not a compile-time constant
+ // (15.28) from constructors, instance initializer blocks,
+ // or instance variable initializer expressions of that
+ // type. It is a compile-time error for the constructors,
+ // instance initializer blocks, or instance variable
+ // initializer expressions of an enum constant e to refer
+ // to itself or to an enum constant of the same type that
+ // is declared to the right of e."
+ if (isStaticEnumField(v)) {
+ ClassSymbol enclClass = env.info.scope.owner.enclClass();
+
+ if (enclClass == null || enclClass.owner == null)
+ return;
+
+ // See if the enclosing class is the enum (or a
+ // subclass thereof) declaring v. If not, this
+ // reference is OK.
+ if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
+ return;
+
+ // If the reference isn't from an initializer, then
+ // the reference is OK.
+ if (!Resolve.isInitializer(env))
+ return;
+
+ log.error(tree.pos(), Errors.IllegalEnumStaticRef);
+ }
+ }
+
+ /** Is the given symbol a static, non-constant field of an Enum?
+ * Note: enum literals should not be regarded as such
+ */
+ private boolean isStaticEnumField(VarSymbol v) {
+ return Flags.isEnum(v.owner) &&
+ Flags.isStatic(v) &&
+ !Flags.isConstant(v) &&
+ v.name != names._class;
+ }
+
+ /**
+ * Check that method arguments conform to its instantiation.
+ **/
+ public Type checkMethod(Type site,
+ final Symbol sym,
+ ResultInfo resultInfo,
+ Env<AttrContext> env,
+ final List<JCExpression> argtrees,
+ List<Type> argtypes,
+ List<Type> typeargtypes) {
+ // Test (5): if symbol is an instance method of a raw type, issue
+ // an unchecked warning if its argument types change under erasure.
+ if ((sym.flags() & STATIC) == 0 &&
+ (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
+ Type s = types.asOuterSuper(site, sym.owner);
+ if (s != null && s.isRaw() &&
+ !types.isSameTypes(sym.type.getParameterTypes(),
+ sym.erasure(types).getParameterTypes())) {
+ chk.warnUnchecked(env.tree.pos(),
+ "unchecked.call.mbr.of.raw.type",
+ sym, s);
+ }
+ }
+
+ if (env.info.defaultSuperCallSite != null) {
+ for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
+ if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
+ types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
+ List<MethodSymbol> icand_sup =
+ types.interfaceCandidates(sup, (MethodSymbol)sym);
+ if (icand_sup.nonEmpty() &&
+ icand_sup.head != sym &&
+ icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
+ log.error(env.tree.pos(),
+ Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
+ break;
+ }
+ }
+ env.info.defaultSuperCallSite = null;
+ }
+
+ if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
+ JCMethodInvocation app = (JCMethodInvocation)env.tree;
+ if (app.meth.hasTag(SELECT) &&
+ !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
+ log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
+ }
+ }
+
+ // Compute the identifier's instantiated type.
+ // For methods, we need to compute the instance type by
+ // Resolve.instantiate from the symbol's type as well as
+ // any type arguments and value arguments.
+ Warner noteWarner = new Warner();
+ try {
+ Type owntype = rs.checkMethod(
+ env,
+ site,
+ sym,
+ resultInfo,
+ argtypes,
+ typeargtypes,
+ noteWarner);
+
+ DeferredAttr.DeferredTypeMap checkDeferredMap =
+ deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
+
+ argtypes = argtypes.map(checkDeferredMap);
+
+ if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
+ chk.warnUnchecked(env.tree.pos(),
+ "unchecked.meth.invocation.applied",
+ kindName(sym),
+ sym.name,
+ rs.methodArguments(sym.type.getParameterTypes()),
+ rs.methodArguments(argtypes.map(checkDeferredMap)),
+ kindName(sym.location()),
+ sym.location());
+ if (resultInfo.pt != Infer.anyPoly ||
+ !owntype.hasTag(METHOD) ||
+ !owntype.isPartial()) {
+ //if this is not a partially inferred method type, erase return type. Otherwise,
+ //erasure is carried out in PartiallyInferredMethodType.check().
+ owntype = new MethodType(owntype.getParameterTypes(),
+ types.erasure(owntype.getReturnType()),
+ types.erasure(owntype.getThrownTypes()),
+ syms.methodClass);
+ }
+ }
+
+ PolyKind pkind = (sym.type.hasTag(FORALL) &&
+ sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
+ PolyKind.POLY : PolyKind.STANDALONE;
+ TreeInfo.setPolyKind(env.tree, pkind);
+
+ return (resultInfo.pt == Infer.anyPoly) ?
+ owntype :
+ chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
+ resultInfo.checkContext.inferenceContext());
+ } catch (Infer.InferenceException ex) {
+ //invalid target type - propagate exception outwards or report error
+ //depending on the current check context
+ resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
+ return types.createErrorType(site);
+ } catch (Resolve.InapplicableMethodException ex) {
+ final JCDiagnostic diag = ex.getDiagnostic();
+ Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
+ @Override
+ protected Pair<Symbol, JCDiagnostic> errCandidate() {
+ return new Pair<>(sym, diag);
+ }
+ };
+ List<Type> argtypes2 = argtypes.map(
+ rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
+ JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
+ env.tree, sym, site, sym.name, argtypes2, typeargtypes);
+ log.report(errDiag);
+ return types.createErrorType(site);
+ }
+ }
+
+ public void visitLiteral(JCLiteral tree) {
+ result = check(tree, litType(tree.typetag).constType(tree.value),
+ KindSelector.VAL, resultInfo);
+ }
+ //where
+ /** Return the type of a literal with given type tag.
+ */
+ Type litType(TypeTag tag) {
+ return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
+ }
+
+ public void visitTypeIdent(JCPrimitiveTypeTree tree) {
+ result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
+ }
+
+ public void visitTypeArray(JCArrayTypeTree tree) {
+ Type etype = attribType(tree.elemtype, env);
+ Type type = new ArrayType(etype, syms.arrayClass);
+ result = check(tree, type, KindSelector.TYP, resultInfo);
+ }
+
+ /** Visitor method for parameterized types.
+ * Bound checking is left until later, since types are attributed
+ * before supertype structure is completely known
+ */
+ public void visitTypeApply(JCTypeApply tree) {
+ Type owntype = types.createErrorType(tree.type);
+
+ // Attribute functor part of application and make sure it's a class.
+ Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
+
+ // Attribute type parameters
+ List<Type> actuals = attribTypes(tree.arguments, env);
+
+ if (clazztype.hasTag(CLASS)) {
+ List<Type> formals = clazztype.tsym.type.getTypeArguments();
+ if (actuals.isEmpty()) //diamond
+ actuals = formals;
+
+ if (actuals.length() == formals.length()) {
+ List<Type> a = actuals;
+ List<Type> f = formals;
+ while (a.nonEmpty()) {
+ a.head = a.head.withTypeVar(f.head);
+ a = a.tail;
+ f = f.tail;
+ }
+ // Compute the proper generic outer
+ Type clazzOuter = clazztype.getEnclosingType();
+ if (clazzOuter.hasTag(CLASS)) {
+ Type site;
+ JCExpression clazz = TreeInfo.typeIn(tree.clazz);
+ if (clazz.hasTag(IDENT)) {
+ site = env.enclClass.sym.type;
+ } else if (clazz.hasTag(SELECT)) {
+ site = ((JCFieldAccess) clazz).selected.type;
+ } else throw new AssertionError(""+tree);
+ if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
+ if (site.hasTag(CLASS))
+ site = types.asOuterSuper(site, clazzOuter.tsym);
+ if (site == null)
+ site = types.erasure(clazzOuter);
+ clazzOuter = site;
+ }
+ }
+ owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
+ clazztype.getMetadata());
+ } else {
+ if (formals.length() != 0) {
+ log.error(tree.pos(),
+ Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
+ } else {
+ log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
+ }
+ owntype = types.createErrorType(tree.type);
+ }
+ }
+ result = check(tree, owntype, KindSelector.TYP, resultInfo);
+ }
+
+ public void visitTypeUnion(JCTypeUnion tree) {
+ ListBuffer<Type> multicatchTypes = new ListBuffer<>();
+ ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
+ for (JCExpression typeTree : tree.alternatives) {
+ Type ctype = attribType(typeTree, env);
+ ctype = chk.checkType(typeTree.pos(),
+ chk.checkClassType(typeTree.pos(), ctype),
+ syms.throwableType);
+ if (!ctype.isErroneous()) {
+ //check that alternatives of a union type are pairwise
+ //unrelated w.r.t. subtyping
+ if (chk.intersects(ctype, multicatchTypes.toList())) {
+ for (Type t : multicatchTypes) {
+ boolean sub = types.isSubtype(ctype, t);
+ boolean sup = types.isSubtype(t, ctype);
+ if (sub || sup) {
+ //assume 'a' <: 'b'
+ Type a = sub ? ctype : t;
+ Type b = sub ? t : ctype;
+ log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
+ }
+ }
+ }
+ multicatchTypes.append(ctype);
+ if (all_multicatchTypes != null)
+ all_multicatchTypes.append(ctype);
+ } else {
+ if (all_multicatchTypes == null) {
+ all_multicatchTypes = new ListBuffer<>();
+ all_multicatchTypes.appendList(multicatchTypes);
+ }
+ all_multicatchTypes.append(ctype);
+ }
+ }
+ Type t = check(tree, types.lub(multicatchTypes.toList()),
+ KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
+ if (t.hasTag(CLASS)) {
+ List<Type> alternatives =
+ ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
+ t = new UnionClassType((ClassType) t, alternatives);
+ }
+ tree.type = result = t;
+ }
+
+ public void visitTypeIntersection(JCTypeIntersection tree) {
+ attribTypes(tree.bounds, env);
+ tree.type = result = checkIntersection(tree, tree.bounds);
+ }
+
+ public void visitTypeParameter(JCTypeParameter tree) {
+ TypeVar typeVar = (TypeVar) tree.type;
+
+ if (tree.annotations != null && tree.annotations.nonEmpty()) {
+ annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
+ }
+
+ if (!typeVar.bound.isErroneous()) {
+ //fixup type-parameter bound computed in 'attribTypeVariables'
+ typeVar.bound = checkIntersection(tree, tree.bounds);
+ }
+ }
+
+ Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
+ Set<Type> boundSet = new HashSet<>();
+ if (bounds.nonEmpty()) {
+ // accept class or interface or typevar as first bound.
+ bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
+ boundSet.add(types.erasure(bounds.head.type));
+ if (bounds.head.type.isErroneous()) {
+ return bounds.head.type;
+ }
+ else if (bounds.head.type.hasTag(TYPEVAR)) {
+ // if first bound was a typevar, do not accept further bounds.
+ if (bounds.tail.nonEmpty()) {
+ log.error(bounds.tail.head.pos(),
+ Errors.TypeVarMayNotBeFollowedByOtherBounds);
+ return bounds.head.type;
+ }
+ } else {
+ // if first bound was a class or interface, accept only interfaces
+ // as further bounds.
+ for (JCExpression bound : bounds.tail) {
+ bound.type = checkBase(bound.type, bound, env, false, true, false);
+ if (bound.type.isErroneous()) {
+ bounds = List.of(bound);
+ }
+ else if (bound.type.hasTag(CLASS)) {
+ chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
+ }
+ }
+ }
+ }
+
+ if (bounds.length() == 0) {
+ return syms.objectType;
+ } else if (bounds.length() == 1) {
+ return bounds.head.type;
+ } else {
+ Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
+ // ... the variable's bound is a class type flagged COMPOUND
+ // (see comment for TypeVar.bound).
+ // In this case, generate a class tree that represents the
+ // bound class, ...
+ JCExpression extending;
+ List<JCExpression> implementing;
+ if (!bounds.head.type.isInterface()) {
+ extending = bounds.head;
+ implementing = bounds.tail;
+ } else {
+ extending = null;
+ implementing = bounds;
+ }
+ JCClassDecl cd = make.at(tree).ClassDef(
+ make.Modifiers(PUBLIC | ABSTRACT),
+ names.empty, List.nil(),
+ extending, implementing, List.nil());
+
+ ClassSymbol c = (ClassSymbol)owntype.tsym;
+ Assert.check((c.flags() & COMPOUND) != 0);
+ cd.sym = c;
+ c.sourcefile = env.toplevel.sourcefile;
+
+ // ... and attribute the bound class
+ c.flags_field |= UNATTRIBUTED;
+ Env<AttrContext> cenv = enter.classEnv(cd, env);
+ typeEnvs.put(c, cenv);
+ attribClass(c);
+ return owntype;
+ }
+ }
+
+ public void visitWildcard(JCWildcard tree) {
+ //- System.err.println("visitWildcard("+tree+");");//DEBUG
+ Type type = (tree.kind.kind == BoundKind.UNBOUND)
+ ? syms.objectType
+ : attribType(tree.inner, env);
+ result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
+ tree.kind.kind,
+ syms.boundClass),
+ KindSelector.TYP, resultInfo);
+ }
+
+ public void visitAnnotation(JCAnnotation tree) {
+ Assert.error("should be handled in annotate");
+ }
+
+ public void visitAnnotatedType(JCAnnotatedType tree) {
+ attribAnnotationTypes(tree.annotations, env);
+ Type underlyingType = attribType(tree.underlyingType, env);
+ Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
+
+ if (!env.info.isNewClass)
+ annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
+ result = tree.type = annotatedType;
+ }
+
+ public void visitErroneous(JCErroneous tree) {
+ if (tree.errs != null)
+ for (JCTree err : tree.errs)
+ attribTree(err, env, new ResultInfo(KindSelector.ERR, pt()));
+ result = tree.type = syms.errType;
+ }
+
+ /** Default visitor method for all other trees.
+ */
+ public void visitTree(JCTree tree) {
+ throw new AssertionError();
+ }
+
+ /**
+ * Attribute an env for either a top level tree or class or module declaration.
+ */
+ public void attrib(Env<AttrContext> env) {
+ switch (env.tree.getTag()) {
+ case MODULEDEF:
+ attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
+ break;
+ case TOPLEVEL:
+ attribTopLevel(env);
+ break;
+ case PACKAGEDEF:
+ attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
+ break;
+ default:
+ attribClass(env.tree.pos(), env.enclClass.sym);
+ }
+ }
+
+ /**
+ * Attribute a top level tree. These trees are encountered when the
+ * package declaration has annotations.
+ */
+ public void attribTopLevel(Env<AttrContext> env) {
+ JCCompilationUnit toplevel = env.toplevel;
+ try {
+ annotate.flush();
+ } catch (CompletionFailure ex) {
+ chk.completionError(toplevel.pos(), ex);
+ }
+ }
+
+ public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
+ try {
+ annotate.flush();
+ attribPackage(p);
+ } catch (CompletionFailure ex) {
+ chk.completionError(pos, ex);
+ }
+ }
+
+ void attribPackage(PackageSymbol p) {
+ Env<AttrContext> env = typeEnvs.get(p);
+ chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
+ }
+
+ public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
+ try {
+ annotate.flush();
+ attribModule(m);
+ } catch (CompletionFailure ex) {
+ chk.completionError(pos, ex);
+ }
+ }
+
+ void attribModule(ModuleSymbol m) {
+ // Get environment current at the point of module definition.
+ Env<AttrContext> env = enter.typeEnvs.get(m);
+ attribStat(env.tree, env);
+ }
+
+ /** Main method: attribute class definition associated with given class symbol.
+ * reporting completion failures at the given position.
+ * @param pos The source position at which completion errors are to be
+ * reported.
+ * @param c The class symbol whose definition will be attributed.
+ */
+ public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
+ try {
+ annotate.flush();
+ attribClass(c);
+ } catch (CompletionFailure ex) {
+ chk.completionError(pos, ex);
+ }
+ }
+
+ /** Attribute class definition associated with given class symbol.
+ * @param c The class symbol whose definition will be attributed.
+ */
+ void attribClass(ClassSymbol c) throws CompletionFailure {
+ if (c.type.hasTag(ERROR)) return;
+
+ // Check for cycles in the inheritance graph, which can arise from
+ // ill-formed class files.
+ chk.checkNonCyclic(null, c.type);
+
+ Type st = types.supertype(c.type);
+ if ((c.flags_field & Flags.COMPOUND) == 0) {
+ // First, attribute superclass.
+ if (st.hasTag(CLASS))
+ attribClass((ClassSymbol)st.tsym);
+
+ // Next attribute owner, if it is a class.
+ if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
+ attribClass((ClassSymbol)c.owner);
+ }
+
+ // The previous operations might have attributed the current class
+ // if there was a cycle. So we test first whether the class is still
+ // UNATTRIBUTED.
+ if ((c.flags_field & UNATTRIBUTED) != 0) {
+ c.flags_field &= ~UNATTRIBUTED;
+
+ // Get environment current at the point of class definition.
+ Env<AttrContext> env = typeEnvs.get(c);
+
+ // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
+ // because the annotations were not available at the time the env was created. Therefore,
+ // we look up the environment chain for the first enclosing environment for which the
+ // lint value is set. Typically, this is the parent env, but might be further if there
+ // are any envs created as a result of TypeParameter nodes.
+ Env<AttrContext> lintEnv = env;
+ while (lintEnv.info.lint == null)
+ lintEnv = lintEnv.next;
+
+ // Having found the enclosing lint value, we can initialize the lint value for this class
+ env.info.lint = lintEnv.info.lint.augment(c);
+
+ Lint prevLint = chk.setLint(env.info.lint);
+ JavaFileObject prev = log.useSource(c.sourcefile);
+ ResultInfo prevReturnRes = env.info.returnResult;
+
+ try {
+ deferredLintHandler.flush(env.tree);
+ env.info.returnResult = null;
+ // java.lang.Enum may not be subclassed by a non-enum
+ if (st.tsym == syms.enumSym &&
+ ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
+ log.error(env.tree.pos(), Errors.EnumNoSubclassing);
+
+ // Enums may not be extended by source-level classes
+ if (st.tsym != null &&
+ ((st.tsym.flags_field & Flags.ENUM) != 0) &&
+ ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
+ log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
+ }
+
+ if (isSerializable(c.type)) {
+ env.info.isSerializable = true;
+ }
+
+ attribClassBody(env, c);
+
+ chk.checkDeprecatedAnnotation(env.tree.pos(), c);
+ chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
+ chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
+ chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
+ } finally {
+ env.info.returnResult = prevReturnRes;
+ log.useSource(prev);
+ chk.setLint(prevLint);
+ }
+
+ }
+ }
+
+ public void visitImport(JCImport tree) {
+ // nothing to do
+ }
+
+ public void visitModuleDef(JCModuleDecl tree) {
+ tree.sym.completeUsesProvides();
+ ModuleSymbol msym = tree.sym;
+ Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
+ Lint prevLint = chk.setLint(lint);
+ chk.checkModuleName(tree);
+ chk.checkDeprecatedAnnotation(tree, msym);
+
+ try {
+ deferredLintHandler.flush(tree.pos());
+ } finally {
+ chk.setLint(prevLint);
+ }
+ }
+
+ /** Finish the attribution of a class. */
+ private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
+ JCClassDecl tree = (JCClassDecl)env.tree;
+ Assert.check(c == tree.sym);
+
+ // Validate type parameters, supertype and interfaces.
+ attribStats(tree.typarams, env);
+ if (!c.isAnonymous()) {
+ //already checked if anonymous
+ chk.validate(tree.typarams, env);
+ chk.validate(tree.extending, env);
+ chk.validate(tree.implementing, env);
+ }
+
+ c.markAbstractIfNeeded(types);
+
+ // If this is a non-abstract class, check that it has no abstract
+ // methods or unimplemented methods of an implemented interface.
+ if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
+ chk.checkAllDefined(tree.pos(), c);
+ }
+
+ if ((c.flags() & ANNOTATION) != 0) {
+ if (tree.implementing.nonEmpty())
+ log.error(tree.implementing.head.pos(),
+ Errors.CantExtendIntfAnnotation);
+ if (tree.typarams.nonEmpty()) {
+ log.error(tree.typarams.head.pos(),
+ Errors.IntfAnnotationCantHaveTypeParams(c));
+ }
+
+ // If this annotation type has a @Repeatable, validate
+ Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
+ // If this annotation type has a @Repeatable, validate
+ if (repeatable != null) {
+ // get diagnostic position for error reporting
+ DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
+ Assert.checkNonNull(cbPos);
+
+ chk.validateRepeatable(c, repeatable, cbPos);
+ }
+ } else {
+ // Check that all extended classes and interfaces
+ // are compatible (i.e. no two define methods with same arguments
+ // yet different return types). (JLS 8.4.6.3)
+ chk.checkCompatibleSupertypes(tree.pos(), c.type);
+ if (allowDefaultMethods) {
+ chk.checkDefaultMethodClashes(tree.pos(), c.type);
+ }
+ }
+
+ // Check that class does not import the same parameterized interface
+ // with two different argument lists.
+ chk.checkClassBounds(tree.pos(), c.type);
+
+ tree.type = c.type;
+
+ for (List<JCTypeParameter> l = tree.typarams;
+ l.nonEmpty(); l = l.tail) {
+ Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
+ }
+
+ // Check that a generic class doesn't extend Throwable
+ if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
+ log.error(tree.extending.pos(), Errors.GenericThrowable);
+
+ // Check that all methods which implement some
+ // method conform to the method they implement.
+ chk.checkImplementations(tree);
+
+ //check that a resource implementing AutoCloseable cannot throw InterruptedException
+ checkAutoCloseable(tree.pos(), env, c.type);
+
+ for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
+ // Attribute declaration
+ attribStat(l.head, env);
+ // Check that declarations in inner classes are not static (JLS 8.1.2)
+ // Make an exception for static constants.
+ if (c.owner.kind != PCK &&
+ ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
+ (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
+ Symbol sym = null;
+ if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
+ if (sym == null ||
+ sym.kind != VAR ||
+ ((VarSymbol) sym).getConstValue() == null)
+ log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
+ }
+ }
+
+ // Check for cycles among non-initial constructors.
+ chk.checkCyclicConstructors(tree);
+
+ // Check for cycles among annotation elements.
+ chk.checkNonCyclicElements(tree);
+
+ // Check for proper use of serialVersionUID
+ if (env.info.lint.isEnabled(LintCategory.SERIAL)
+ && isSerializable(c.type)
+ && (c.flags() & Flags.ENUM) == 0
+ && !c.isAnonymous()
+ && checkForSerial(c)) {
+ checkSerialVersionUID(tree, c);
+ }
+ if (allowTypeAnnos) {
+ // Correctly organize the postions of the type annotations
+ typeAnnotations.organizeTypeAnnotationsBodies(tree);
+
+ // Check type annotations applicability rules
+ validateTypeAnnotations(tree, false);
+ }
+ }
+ // where
+ boolean checkForSerial(ClassSymbol c) {
+ if ((c.flags() & ABSTRACT) == 0) {
+ return true;
+ } else {
+ return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
+ }
+ }
+
+ public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = s ->
+ s.kind == MTH && (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
+
+ /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
+ private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
+ for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
+ if (types.isSameType(al.head.annotationType.type, t))
+ return al.head.pos();
+ }
+
+ return null;
+ }
+
+ /** check if a type is a subtype of Serializable, if that is available. */
+ boolean isSerializable(Type t) {
+ try {
+ syms.serializableType.complete();
+ }
+ catch (CompletionFailure e) {
+ return false;
+ }
+ return types.isSubtype(t, syms.serializableType);
+ }
+
+ /** Check that an appropriate serialVersionUID member is defined. */
+ private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
+
+ // check for presence of serialVersionUID
+ VarSymbol svuid = null;
+ for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
+ if (sym.kind == VAR) {
+ svuid = (VarSymbol)sym;
+ break;
+ }
+ }
+
+ if (svuid == null) {
+ log.warning(LintCategory.SERIAL,
+ tree.pos(), Warnings.MissingSVUID(c));
+ return;
+ }
+
+ // check that it is static final
+ if ((svuid.flags() & (STATIC | FINAL)) !=
+ (STATIC | FINAL))
+ log.warning(LintCategory.SERIAL,
+ TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
+
+ // check that it is long
+ else if (!svuid.type.hasTag(LONG))
+ log.warning(LintCategory.SERIAL,
+ TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
+
+ // check constant
+ else if (svuid.getConstValue() == null)
+ log.warning(LintCategory.SERIAL,
+ TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
+ }
+
+ private Type capture(Type type) {
+ return types.capture(type);
+ }
+
+ public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
+ tree.accept(new TypeAnnotationsValidator(sigOnly));
+ }
+ //where
+ private final class TypeAnnotationsValidator extends TreeScanner {
+
+ private final boolean sigOnly;
+ public TypeAnnotationsValidator(boolean sigOnly) {
+ this.sigOnly = sigOnly;
+ }
+
+ public void visitAnnotation(JCAnnotation tree) {
+ chk.validateTypeAnnotation(tree, false);
+ super.visitAnnotation(tree);
+ }
+ public void visitAnnotatedType(JCAnnotatedType tree) {
+ if (!tree.underlyingType.type.isErroneous()) {
+ super.visitAnnotatedType(tree);
+ }
+ }
+ public void visitTypeParameter(JCTypeParameter tree) {
+ chk.validateTypeAnnotations(tree.annotations, true);
+ scan(tree.bounds);
+ // Don't call super.
+ // This is needed because above we call validateTypeAnnotation with
+ // false, which would forbid annotations on type parameters.
+ // super.visitTypeParameter(tree);
+ }
+ public void visitMethodDef(JCMethodDecl tree) {
+ if (tree.recvparam != null &&
+ !tree.recvparam.vartype.type.isErroneous()) {
+ checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
+ tree.recvparam.vartype.type.tsym);
+ }
+ if (tree.restype != null && tree.restype.type != null) {
+ validateAnnotatedType(tree.restype, tree.restype.type);
+ }
+ if (sigOnly) {
+ scan(tree.mods);
+ scan(tree.restype);
+ scan(tree.typarams);
+ scan(tree.recvparam);
+ scan(tree.params);
+ scan(tree.thrown);
+ } else {
+ scan(tree.defaultValue);
+ scan(tree.body);
+ }
+ }
+ public void visitVarDef(final JCVariableDecl tree) {
+ //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
+ if (tree.sym != null && tree.sym.type != null)
+ validateAnnotatedType(tree.vartype, tree.sym.type);
+ scan(tree.mods);
+ scan(tree.vartype);
+ if (!sigOnly) {
+ scan(tree.init);
+ }
+ }
+ public void visitTypeCast(JCTypeCast tree) {
+ if (tree.clazz != null && tree.clazz.type != null)
+ validateAnnotatedType(tree.clazz, tree.clazz.type);
+ super.visitTypeCast(tree);
+ }
+ public void visitTypeTest(JCInstanceOf tree) {
+ if (tree.clazz != null && tree.clazz.type != null)
+ validateAnnotatedType(tree.clazz, tree.clazz.type);
+ super.visitTypeTest(tree);
+ }
+ public void visitNewClass(JCNewClass tree) {
+ if (tree.clazz != null && tree.clazz.type != null) {
+ if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
+ checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
+ tree.clazz.type.tsym);
+ }
+ if (tree.def != null) {
+ checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
+ }
+
+ validateAnnotatedType(tree.clazz, tree.clazz.type);
+ }
+ super.visitNewClass(tree);
+ }
+ public void visitNewArray(JCNewArray tree) {
+ if (tree.elemtype != null && tree.elemtype.type != null) {
+ if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
+ checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
+ tree.elemtype.type.tsym);
+ }
+ validateAnnotatedType(tree.elemtype, tree.elemtype.type);
+ }
+ super.visitNewArray(tree);
+ }
+ public void visitClassDef(JCClassDecl tree) {
+ //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
+ if (sigOnly) {
+ scan(tree.mods);
+ scan(tree.typarams);
+ scan(tree.extending);
+ scan(tree.implementing);
+ }
+ for (JCTree member : tree.defs) {
+ if (member.hasTag(Tag.CLASSDEF)) {
+ continue;
+ }
+ scan(member);
+ }
+ }
+ public void visitBlock(JCBlock tree) {
+ if (!sigOnly) {
+ scan(tree.stats);
+ }
+ }
+
+ /* I would want to model this after
+ * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
+ * and override visitSelect and visitTypeApply.
+ * However, we only set the annotated type in the top-level type
+ * of the symbol.
+ * Therefore, we need to override each individual location where a type
+ * can occur.
+ */
+ private void validateAnnotatedType(final JCTree errtree, final Type type) {
+ //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
+
+ if (type.isPrimitiveOrVoid()) {
+ return;
+ }
+
+ JCTree enclTr = errtree;
+ Type enclTy = type;
+
+ boolean repeat = true;
+ while (repeat) {
+ if (enclTr.hasTag(TYPEAPPLY)) {
+ List<Type> tyargs = enclTy.getTypeArguments();
+ List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
+ if (trargs.length() > 0) {
+ // Nothing to do for diamonds
+ if (tyargs.length() == trargs.length()) {
+ for (int i = 0; i < tyargs.length(); ++i) {
+ validateAnnotatedType(trargs.get(i), tyargs.get(i));
+ }
+ }
+ // If the lengths don't match, it's either a diamond
+ // or some nested type that redundantly provides
+ // type arguments in the tree.
+ }
+
+ // Look at the clazz part of a generic type
+ enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
+ }
+
+ if (enclTr.hasTag(SELECT)) {
+ enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
+ if (enclTy != null &&
+ !enclTy.hasTag(NONE)) {
+ enclTy = enclTy.getEnclosingType();
+ }
+ } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
+ JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
+ if (enclTy == null || enclTy.hasTag(NONE)) {
+ if (at.getAnnotations().size() == 1) {
+ log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
+ } else {
+ ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
+ for (JCAnnotation an : at.getAnnotations()) {
+ comps.add(an.attribute);
+ }
+ log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
+ }
+ repeat = false;
+ }
+ enclTr = at.underlyingType;
+ // enclTy doesn't need to be changed
+ } else if (enclTr.hasTag(IDENT)) {
+ repeat = false;
+ } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
+ JCWildcard wc = (JCWildcard) enclTr;
+ if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
+ validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound());
+ } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
+ validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound());
+ } else {
+ // Nothing to do for UNBOUND
+ }
+ repeat = false;
+ } else if (enclTr.hasTag(TYPEARRAY)) {
+ JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
+ validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType());
+ repeat = false;
+ } else if (enclTr.hasTag(TYPEUNION)) {
+ JCTypeUnion ut = (JCTypeUnion) enclTr;
+ for (JCTree t : ut.getTypeAlternatives()) {
+ validateAnnotatedType(t, t.type);
+ }
+ repeat = false;
+ } else if (enclTr.hasTag(TYPEINTERSECTION)) {
+ JCTypeIntersection it = (JCTypeIntersection) enclTr;
+ for (JCTree t : it.getBounds()) {
+ validateAnnotatedType(t, t.type);
+ }
+ repeat = false;
+ } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
+ enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
+ repeat = false;
+ } else {
+ Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
+ " within: "+ errtree + " with kind: " + errtree.getKind());
+ }
+ }
+ }
+
+ private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
+ Symbol sym) {
+ // Ensure that no declaration annotations are present.
+ // Note that a tree type might be an AnnotatedType with
+ // empty annotations, if only declaration annotations were given.
+ // This method will raise an error for such a type.
+ for (JCAnnotation ai : annotations) {
+ if (!ai.type.isErroneous() &&
+ typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
+ log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
+ }
+ }
+ }
+ }
+
+ // <editor-fold desc="post-attribution visitor">
+
+ /**
+ * Handle missing types/symbols in an AST. This routine is useful when
+ * the compiler has encountered some errors (which might have ended up
+ * terminating attribution abruptly); if the compiler is used in fail-over
+ * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
+ * prevents NPE to be progagated during subsequent compilation steps.
+ */
+ public void postAttr(JCTree tree) {
+ new PostAttrAnalyzer().scan(tree);
+ }
+
+ class PostAttrAnalyzer extends TreeScanner {
+
+ private void initTypeIfNeeded(JCTree that) {
+ if (that.type == null) {
+ if (that.hasTag(METHODDEF)) {
+ that.type = dummyMethodType((JCMethodDecl)that);
+ } else {
+ that.type = syms.unknownType;
+ }
+ }
+ }
+
+ /* Construct a dummy method type. If we have a method declaration,
+ * and the declared return type is void, then use that return type
+ * instead of UNKNOWN to avoid spurious error messages in lambda
+ * bodies (see:JDK-8041704).
+ */
+ private Type dummyMethodType(JCMethodDecl md) {
+ Type restype = syms.unknownType;
+ if (md != null && md.restype.hasTag(TYPEIDENT)) {
+ JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
+ if (prim.typetag == VOID)
+ restype = syms.voidType;
+ }
+ return new MethodType(List.nil(), restype,
+ List.nil(), syms.methodClass);
+ }
+ private Type dummyMethodType() {
+ return dummyMethodType(null);
+ }
+
+ @Override
+ public void scan(JCTree tree) {
+ if (tree == null) return;
+ if (tree instanceof JCExpression) {
+ initTypeIfNeeded(tree);
+ }
+ super.scan(tree);
+ }
+
+ @Override
+ public void visitIdent(JCIdent that) {
+ if (that.sym == null) {
+ that.sym = syms.unknownSymbol;
+ }
+ }
+
+ @Override
+ public void visitSelect(JCFieldAccess that) {
+ if (that.sym == null) {
+ that.sym = syms.unknownSymbol;
+ }
+ super.visitSelect(that);
+ }
+
+ @Override
+ public void visitClassDef(JCClassDecl that) {
+ initTypeIfNeeded(that);
+ if (that.sym == null) {
+ that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
+ }
+ super.visitClassDef(that);
+ }
+
+ @Override
+ public void visitMethodDef(JCMethodDecl that) {
+ initTypeIfNeeded(that);
+ if (that.sym == null) {
+ that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
+ }
+ super.visitMethodDef(that);
+ }
+
+ @Override
+ public void visitVarDef(JCVariableDecl that) {
+ initTypeIfNeeded(that);
+ if (that.sym == null) {
+ that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
+ that.sym.adr = 0;
+ }
+ if (that.vartype == null) {
+ that.vartype = make.Erroneous();
+ }
+ super.visitVarDef(that);
+ }
+
+ @Override
+ public void visitNewClass(JCNewClass that) {
+ if (that.constructor == null) {
+ that.constructor = new MethodSymbol(0, names.init,
+ dummyMethodType(), syms.noSymbol);
+ }
+ if (that.constructorType == null) {
+ that.constructorType = syms.unknownType;
+ }
+ super.visitNewClass(that);
+ }
+
+ @Override
+ public void visitAssignop(JCAssignOp that) {
+ if (that.operator == null) {
+ that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
+ -1, syms.noSymbol);
+ }
+ super.visitAssignop(that);
+ }
+
+ @Override
+ public void visitBinary(JCBinary that) {
+ if (that.operator == null) {
+ that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
+ -1, syms.noSymbol);
+ }
+ super.visitBinary(that);
+ }
+
+ @Override
+ public void visitUnary(JCUnary that) {
+ if (that.operator == null) {
+ that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
+ -1, syms.noSymbol);
+ }
+ super.visitUnary(that);
+ }
+
+ @Override
+ public void visitLambda(JCLambda that) {
+ super.visitLambda(that);
+ if (that.targets == null) {
+ that.targets = List.nil();
+ }
+ }
+
+ @Override
+ public void visitReference(JCMemberReference that) {
+ super.visitReference(that);
+ if (that.sym == null) {
+ that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
+ syms.noSymbol);
+ }
+ if (that.targets == null) {
+ that.targets = List.nil();
+ }
+ }
+ }
+ // </editor-fold>
+
+ public void setPackageSymbols(JCExpression pid, Symbol pkg) {
+ new TreeScanner() {
+ Symbol packge = pkg;
+ @Override
+ public void visitIdent(JCIdent that) {
+ that.sym = packge;
+ }
+
+ @Override
+ public void visitSelect(JCFieldAccess that) {
+ that.sym = packge;
+ packge = packge.owner;
+ super.visitSelect(that);
+ }
+ }.scan(pid);
+ }
+
+}