| /* |
| * 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.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(), "unexpected.type", |
| 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, "try.resource.may.not.be.assigned", v); |
| } else { |
| log.error(pos, "cant.assign.val.to.final.var", 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; |
| } |
| |
| protected void attr(JCTree tree, Env<AttrContext> env) { |
| tree.accept(Attr.this); |
| } |
| |
| 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 void attr(JCTree tree, Env<AttrContext> env) { |
| result = argumentAttr.attribArg(tree, env); |
| } |
| |
| 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; |
| resultInfo.attr(tree, env); |
| 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 = |
| env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); |
| 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, "cant.inherit.from.anon"); |
| 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, "illegal.forward.ref"); |
| return types.createErrorType(t); |
| } |
| } else { |
| t = chk.checkClassType(pos, t, checkExtensible); |
| } |
| if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { |
| log.error(pos, "intf.expected.here"); |
| // 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, "no.intf.expected.here"); |
| return types.createErrorType(t); |
| } |
| if (checkExtensible && |
| ((t.tsym.flags() & FINAL) != 0)) { |
| log.error(pos, |
| "cant.inherit.from.final", 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, "default.overrides.object.member", 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(), |
| "intf.annotation.members.cant.have.params"); |
| |
| // 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(), |
| "throws.not.allowed.in.intf.annotation"); |
| } |
| // annotation method cannot declare type-parameters |
| if (tree.typarams.nonEmpty()) { |
| log.error(tree.typarams.head.pos(), |
| "intf.annotation.members.cant.have.type.params"); |
| } |
| // 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(), |
| "default.allowed.in.intf.annotation.member"); |
| } |
| if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) |
| log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); |
| } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { |
| if ((owner.flags() & INTERFACE) != 0) { |
| log.error(tree.body.pos(), "intf.meth.cant.have.body"); |
| } else { |
| log.error(tree.pos(), "abstract.meth.cant.have.body"); |
| } |
| } else if ((tree.mods.flags & NATIVE) != 0) { |
| log.error(tree.pos(), "native.meth.cant.have.body"); |
| } 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(), |
| "call.to.super.not.allowed.in.enum.ctor", |
| 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(), |
| "foreach.not.applicable.to.type", |
| exprType, |
| diags.fragment("type.req.array.or.iterable")); |
| 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(), "label.already.in.use", |
| 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(), "string.switch.not.supported.in.source", 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(), "enum.label.must.be.unqualified.enum"); |
| } else if (!labels.add(sym)) { |
| log.error(c.pos(), "duplicate.case.label"); |
| } |
| } 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(), "duplicate.case.label"); |
| } |
| } |
| } |
| } else if (hasDefault) { |
| log.error(c.pos(), "duplicate.default.label"); |
| } 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("try.not.applicable.to.type", 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, "try.resource.throws.interrupted.exc", 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("conditional.target.cant.be.void")); |
| 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("incompatible.type.in.conditional", 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, "neither.conditional.subtype", |
| 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, "not.loop.label", 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, "undef.label", label); |
| else if (tag == CONTINUE) |
| log.error(pos, "cont.outside.loop"); |
| else |
| log.error(pos, "break.outside.switch.loop"); |
| 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(), "ret.outside.meth"); |
| } 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("unexpected.ret.val")); |
| } |
| 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("missing.ret.val")); |
| } |
| } |
| 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(), "no.superclass", 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(), "illegal.qual.not.icls", |
| 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(),"call.must.be.first.stmt.in.ctor", |
| 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(), "anon.class.impl.intf.no.qual.for.new"); |
| } else if (clazztype.tsym.isStatic()) { |
| log.error(tree.encl.pos(), "qualified.new.of.static.class", 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(), "enum.cant.be.instantiated"); |
| |
| 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(), "abstract.cant.be.instantiated", |
| 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(), "anon.class.impl.intf.no.args"); |
| |
| if (!typeargtypes.isEmpty()) |
| log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); |
| |
| // 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("cant.apply.diamond.1", diags.fragment("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(), "illegal.initializer.for.type", |
| 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(), "generic.array.creation"); |
| 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(), "unexpected.lambda"); |
| } |
| 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 |
| resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", |
| lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); |
| 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("incompatible.arg.types.in.lambda")); |
| 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); |
| List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); |
| |
| chk.unhandled(inferredThrownTypes, thrownTypes); |
| |
| //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" |
| thrownTypes.stream() |
| .filter(t -> t.hasTag(UNDETVAR)) |
| .forEach(t -> ((UndetVar)t).setThrow()); |
| } |
| |
| 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 |
| resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", |
| lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); |
| 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("bad.intersection.target.for.functional.expr", |
| 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("incompatible.ret.type.in.lambda", 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) { |
| checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", |
| diags.fragment("missing.ret.val", returnType))); |
| } |
| |
| List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); |
| if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { |
| checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); |
| } |
| } |
| |
| /* 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(), "unexpected.mref"); |
| } |
| 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(), "invalid.mref", Kinds.kindName(that.getMode()), |
| diags.fragment("mref.infer.and.explicit.params")); |
| 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(), "invalid.mref", Kinds.kindName(that.getMode()), |
| diags.fragment("static.mref.with.targs")); |
| 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) { |
| checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", |
| diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); |
| } 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) { |
| List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); |
| if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { |
| log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); |
| } |
| //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" |
| thrownTypes.stream() |
| .filter(t -> t.hasTag(UNDETVAR)) |
| .forEach(t -> ((UndetVar)t).setThrow()); |
| } |
| } |
| |
| /** |
| * 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(), "illegal.start.of.type"); |
| } |
| |
| 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(), "incomparable.types", 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(), "illegal.generic.type.for.instof"); |
| 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(), "array.req.but.found", 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(), "type.var.cant.be.deref"); |
| 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(), "not.encl.class", 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, "try.explicit.close.call"); |
| } |
| |
| // 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(), "static.intf.method.invoke.not.supported.in.source", 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, "type.var.cant.be.deref"); |
| 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, "cant.deref", 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(), "illegal.enum.static.ref"); |
| } |
| } |
| |
| /** 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(), "illegal.default.super.call", env.info.defaultSuperCallSite, |
| diags.fragment("overridden.default", 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(), "illegal.static.intf.meth.call", 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(), "wrong.number.type.args", |
| Integer.toString(formals.length())); |
| } else { |
| log.error(tree.pos(), "type.doesnt.take.params", 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(), "multicatch.types.must.be.disjoint", 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(), |
| "type.var.may.not.be.followed.by.other.bounds"); |
| 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(), "enum.no.subclassing"); |
| |
| // 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(), "enum.types.not.extensible"); |
| } |
| |
| 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(), |
| "cant.extend.intf.annotation"); |
| if (tree.typarams.nonEmpty()) |
| log.error(tree.typarams.head.pos(), |
| "intf.annotation.cant.have.type.params"); |
| |
| // 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(), "generic.throwable"); |
| |
| // 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(), "icls.cant.have.static.decl", 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(), "missing.SVUID", c); |
| return; |
| } |
| |
| // check that it is static final |
| if ((svuid.flags() & (STATIC | FINAL)) != |
| (STATIC | FINAL)) |
| log.warning(LintCategory.SERIAL, |
| TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); |
| |
| // check that it is long |
| else if (!svuid.type.hasTag(LONG)) |
| log.warning(LintCategory.SERIAL, |
| TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); |
| |
| // check constant |
| else if (svuid.getConstValue() == null) |
| log.warning(LintCategory.SERIAL, |
| TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", 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(), "cant.type.annotate.scoping.1", 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(), "cant.type.annotate.scoping", 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); |
| } |
| |
| } |