| /* |
| * Copyright 1999-2006 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.tools.javac.comp; |
| |
| import java.util.*; |
| import java.util.Set; |
| import javax.lang.model.element.ElementKind; |
| import javax.tools.JavaFileObject; |
| |
| import com.sun.tools.javac.code.*; |
| import com.sun.tools.javac.jvm.*; |
| import com.sun.tools.javac.tree.*; |
| import com.sun.tools.javac.util.*; |
| import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
| import com.sun.tools.javac.util.List; |
| |
| import com.sun.tools.javac.jvm.Target; |
| import com.sun.tools.javac.code.Symbol.*; |
| import com.sun.tools.javac.tree.JCTree.*; |
| import com.sun.tools.javac.code.Type.*; |
| |
| import com.sun.source.tree.IdentifierTree; |
| import com.sun.source.tree.MemberSelectTree; |
| import com.sun.source.tree.TreeVisitor; |
| import com.sun.source.util.SimpleTreeVisitor; |
| |
| import static com.sun.tools.javac.code.Flags.*; |
| import static com.sun.tools.javac.code.Kinds.*; |
| import static com.sun.tools.javac.code.TypeTags.*; |
| |
| /** 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 API supported by Sun Microsystems. 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<Attr>(); |
| |
| final Name.Table names; |
| final Log log; |
| final Symtab syms; |
| final Resolve rs; |
| final Check chk; |
| final MemberEnter memberEnter; |
| final TreeMaker make; |
| final ConstFold cfolder; |
| final Enter enter; |
| final Target target; |
| final Types types; |
| final Annotate annotate; |
| |
| 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 = Name.Table.instance(context); |
| log = Log.instance(context); |
| syms = Symtab.instance(context); |
| rs = Resolve.instance(context); |
| chk = Check.instance(context); |
| memberEnter = MemberEnter.instance(context); |
| make = TreeMaker.instance(context); |
| enter = Enter.instance(context); |
| cfolder = ConstFold.instance(context); |
| target = Target.instance(context); |
| types = Types.instance(context); |
| annotate = Annotate.instance(context); |
| |
| Options options = Options.instance(context); |
| |
| Source source = Source.instance(context); |
| allowGenerics = source.allowGenerics(); |
| allowVarargs = source.allowVarargs(); |
| allowEnums = source.allowEnums(); |
| allowBoxing = source.allowBoxing(); |
| allowCovariantReturns = source.allowCovariantReturns(); |
| allowAnonOuterThis = source.allowAnonOuterThis(); |
| relax = (options.get("-retrofit") != null || |
| options.get("-relax") != null); |
| useBeforeDeclarationWarning = options.get("useBeforeDeclarationWarning") != null; |
| } |
| |
| /** Switch: relax some constraints for retrofit mode. |
| */ |
| boolean relax; |
| |
| /** Switch: support generics? |
| */ |
| boolean allowGenerics; |
| |
| /** Switch: allow variable-arity methods. |
| */ |
| boolean allowVarargs; |
| |
| /** Switch: support enums? |
| */ |
| boolean allowEnums; |
| |
| /** Switch: support boxing and unboxing? |
| */ |
| boolean allowBoxing; |
| |
| /** Switch: support covariant result types? |
| */ |
| boolean allowCovariantReturns; |
| |
| /** Switch: allow references to surrounding object from anonymous |
| * objects during constructor call? |
| */ |
| boolean allowAnonOuterThis; |
| |
| /** |
| * Switch: warn about use of variable before declaration? |
| * RFE: 6425594 |
| */ |
| boolean useBeforeDeclarationWarning; |
| |
| /** 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. |
| * Its 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 owntype The computed type of the tree |
| * @param ownkind The computed kind of the tree |
| * @param pkind The expected kind (or: protokind) of the tree |
| * @param pt The expected type (or: prototype) of the tree |
| */ |
| Type check(JCTree tree, Type owntype, int ownkind, int pkind, Type pt) { |
| if (owntype.tag != ERROR && pt.tag != METHOD && pt.tag != FORALL) { |
| if ((ownkind & ~pkind) == 0) { |
| owntype = chk.checkType(tree.pos(), owntype, pt); |
| } else { |
| log.error(tree.pos(), "unexpected.type", |
| Resolve.kindNames(pkind), |
| Resolve.kindName(ownkind)); |
| owntype = syms.errType; |
| } |
| } |
| 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 varaible |
| * @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.flags() & FINAL) != 0 && |
| ((v.flags() & HASINIT) != 0 |
| || |
| !((base == null || |
| (base.getTag() == JCTree.IDENT && TreeInfo.name(base) == names._this)) && |
| isAssignableAsBlankFinal(v, env)))) { |
| 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.getTag() == JCTree.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 tree.accept(identAttributer, localEnv); |
| } |
| // where |
| private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); |
| private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { |
| @Override |
| public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { |
| Symbol site = visit(node.getExpression(), env); |
| if (site.kind == ERR) |
| return site; |
| Name name = (Name)node.getIdentifier(); |
| if (site.kind == PCK) { |
| env.toplevel.packge = (PackageSymbol)site; |
| return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK); |
| } else { |
| env.enclClass.sym = (ClassSymbol)site; |
| return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); |
| } |
| } |
| |
| @Override |
| public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { |
| return rs.findIdent(env, (Name)node.getName(), TYP | PCK); |
| } |
| } |
| |
| public Type coerce(Type etype, Type ttype) { |
| return cfolder.coerce(etype, ttype); |
| } |
| |
| public Type attribType(JCTree node, TypeSymbol sym) { |
| Env<AttrContext> env = enter.typeEnvs.get(sym); |
| Env<AttrContext> localEnv = env.dup(node, env.info.dup()); |
| return attribTree(node, localEnv, Kinds.TYP, Type.noType); |
| } |
| |
| public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { |
| breakTree = tree; |
| JavaFileObject prev = log.useSource(null); |
| try { |
| attribExpr(expr, env); |
| } catch (BreakAttr b) { |
| return b.env; |
| } 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(null); |
| try { |
| attribStat(stmt, env); |
| } catch (BreakAttr b) { |
| return b.env; |
| } 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; |
| } |
| } |
| |
| |
| /* ************************************************************************ |
| * Visitor methods |
| *************************************************************************/ |
| |
| /** Visitor argument: the current environment. |
| */ |
| Env<AttrContext> env; |
| |
| /** Visitor argument: the currently expected proto-kind. |
| */ |
| int pkind; |
| |
| /** Visitor argument: the currently expected proto-type. |
| */ |
| Type pt; |
| |
| /** 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 pkind The protokind visitor argument. |
| * @param pt The prototype visitor argument. |
| */ |
| Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt) { |
| Env<AttrContext> prevEnv = this.env; |
| int prevPkind = this.pkind; |
| Type prevPt = this.pt; |
| try { |
| this.env = env; |
| this.pkind = pkind; |
| this.pt = pt; |
| tree.accept(this); |
| if (tree == breakTree) |
| throw new BreakAttr(env); |
| return result; |
| } catch (CompletionFailure ex) { |
| tree.type = syms.errType; |
| return chk.completionError(tree.pos(), ex); |
| } finally { |
| this.env = prevEnv; |
| this.pkind = prevPkind; |
| this.pt = prevPt; |
| } |
| } |
| |
| /** Derived visitor method: attribute an expression tree. |
| */ |
| public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { |
| return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType); |
| } |
| |
| /** Derived visitor method: attribute an expression tree with |
| * no constraints on the computed type. |
| */ |
| Type attribExpr(JCTree tree, Env<AttrContext> env) { |
| return attribTree(tree, env, VAL, Type.noType); |
| } |
| |
| /** Derived visitor method: attribute a type tree. |
| */ |
| Type attribType(JCTree tree, Env<AttrContext> env) { |
| Type result = attribTree(tree, env, TYP, Type.noType); |
| return result; |
| } |
| |
| /** Derived visitor method: attribute a statement or definition tree. |
| */ |
| public Type attribStat(JCTree tree, Env<AttrContext> env) { |
| return attribTree(tree, env, NIL, Type.noType); |
| } |
| |
| /** 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<Type>(); |
| 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 a list of types. |
| */ |
| List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) { |
| ListBuffer<Type> argtypes = new ListBuffer<Type>(); |
| for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) |
| argtypes.append(chk.checkNonVoid( |
| l.head.pos(), types.upperBound(attribTree(l.head, env, VAL, Infer.anyPoly)))); |
| return argtypes.toList(); |
| } |
| |
| /** Attribute a type argument list, returning a list of types. |
| */ |
| List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { |
| ListBuffer<Type> argtypes = new ListBuffer<Type>(); |
| for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) |
| argtypes.append(chk.checkRefType(l.head.pos(), attribType(l.head, env))); |
| return argtypes.toList(); |
| } |
| |
| |
| /** |
| * 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; |
| 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)); |
| } |
| } |
| for (JCTypeParameter tvar : typarams) |
| chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); |
| attribStats(typarams, env); |
| } |
| |
| void attribBounds(List<JCTypeParameter> typarams) { |
| for (JCTypeParameter typaram : typarams) { |
| Type bound = typaram.type.getUpperBound(); |
| if (bound != null && bound.tsym instanceof ClassSymbol) { |
| ClassSymbol c = (ClassSymbol)bound.tsym; |
| if ((c.flags_field & COMPOUND) != 0) { |
| assert (c.flags_field & UNATTRIBUTED) != 0 : c; |
| attribClass(typaram.pos(), c); |
| } |
| } |
| } |
| } |
| |
| /** |
| * 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 type reference in an `extends' or `implements' clause. |
| * |
| * @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 = 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) { |
| if (t.tag == TYPEVAR && !classExpected && !interfaceExpected) { |
| // check that type variable is already visible |
| if (t.getUpperBound() == null) { |
| log.error(tree.pos(), "illegal.forward.ref"); |
| return syms.errType; |
| } |
| } else { |
| t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics); |
| } |
| if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { |
| log.error(tree.pos(), "intf.expected.here"); |
| // return errType is necessary since otherwise there might |
| // be undetected cycles which cause attribution to loop |
| return syms.errType; |
| } else if (checkExtensible && |
| classExpected && |
| (t.tsym.flags() & INTERFACE) != 0) { |
| log.error(tree.pos(), "no.intf.expected.here"); |
| return syms.errType; |
| } |
| if (checkExtensible && |
| ((t.tsym.flags() & FINAL) != 0)) { |
| log.error(tree.pos(), |
| "cant.inherit.from.final", t.tsym); |
| } |
| chk.checkNonCyclic(tree.pos(), t); |
| return t; |
| } |
| |
| public void visitClassDef(JCClassDecl tree) { |
| // Local classes have not been entered yet, so we need to do it now: |
| if ((env.info.scope.owner.kind & (VAR | MTH)) != 0) |
| 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 where |
| // no explicit outer instance is given, |
| // disable implicit outer instance from being passed. |
| // (This would be an illegal access to "this before super"). |
| if (env.info.isSelfCall && |
| env.tree.getTag() == JCTree.NEWCLASS && |
| ((JCNewClass) env.tree).encl == null) |
| { |
| c.flags_field |= NOOUTERTHIS; |
| } |
| attribClass(tree.pos(), c); |
| result = tree.type = c.type; |
| } |
| } |
| |
| public void visitMethodDef(JCMethodDecl tree) { |
| MethodSymbol m = tree.sym; |
| |
| Lint lint = env.info.lint.augment(m.attributes_field, m.flags()); |
| Lint prevLint = chk.setLint(lint); |
| try { |
| chk.checkDeprecatedAnnotation(tree.pos(), m); |
| |
| attribBounds(tree.typarams); |
| |
| // If we override any other methods, check that we do so properly. |
| // JLS ??? |
| chk.checkOverride(tree, m); |
| |
| // Create a new environment with local scope |
| // for attributing the method. |
| Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); |
| |
| localEnv.info.lint = lint; |
| |
| // 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()) |
| log.error(tree.params.head.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); |
| } |
| |
| // Check that type parameters are well-formed. |
| chk.validateTypeParams(tree.typarams); |
| if ((owner.flags() & ANNOTATION) != 0 && |
| tree.typarams.nonEmpty()) |
| log.error(tree.typarams.head.pos(), |
| "intf.annotation.members.cant.have.type.params"); |
| |
| // Check that result type is well-formed. |
| chk.validate(tree.restype); |
| if ((owner.flags() & ANNOTATION) != 0) |
| chk.validateAnnotationType(tree.restype); |
| |
| if ((owner.flags() & ANNOTATION) != 0) |
| chk.validateAnnotationMethod(tree.pos(), m); |
| |
| // Check that all exceptions mentioned in the throws clause extend |
| // java.lang.Throwable. |
| if ((owner.flags() & ANNOTATION) != 0 && tree.thrown.nonEmpty()) |
| log.error(tree.thrown.head.pos(), |
| "throws.not.allowed.in.intf.annotation"); |
| 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 ((owner.flags() & INTERFACE) == 0 && |
| (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 && |
| !relax) |
| log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); |
| if (tree.defaultValue != null) { |
| if ((owner.flags() & ANNOTATION) == 0) |
| log.error(tree.pos(), |
| "default.allowed.in.intf.annotation.member"); |
| } |
| } else if ((owner.flags() & INTERFACE) != 0) { |
| log.error(tree.body.pos(), "intf.meth.cant.have.body"); |
| } else if ((tree.mods.flags & ABSTRACT) != 0) { |
| 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(memberEnter.SuperCall(make.at(body.pos), |
| List.<Type>nil(), |
| List.<JCVariableDecl>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 method body. |
| attribStat(tree.body, localEnv); |
| } |
| localEnv.info.scope.leave(); |
| result = tree.type = m.type; |
| chk.validateAnnotations(tree.mods.annotations, m); |
| |
| } |
| finally { |
| chk.setLint(prevLint); |
| } |
| } |
| |
| 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 { |
| memberEnter.memberEnter(tree, env); |
| annotate.flush(); |
| } |
| } |
| |
| // Check that the variable's declared type is well-formed. |
| chk.validate(tree.vartype); |
| |
| VarSymbol v = tree.sym; |
| Lint lint = env.info.lint.augment(v.attributes_field, v.flags()); |
| Lint prevLint = chk.setLint(lint); |
| |
| try { |
| chk.checkDeprecatedAnnotation(tree.pos(), v); |
| |
| if (tree.init != null) { |
| if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) { |
| // In this case, `v' is final. Ensure that it's initializer is |
| // evaluated. |
| v.getConstValue(); // ensure initializer is evaluated |
| } else { |
| // 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. |
| v.pos = Position.MAXPOS; |
| attribExpr(tree.init, initEnv, v.type); |
| v.pos = tree.pos; |
| } |
| } |
| result = tree.type = v.type; |
| chk.validateAnnotations(tree.mods.annotations, v); |
| } |
| 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. |
| Env<AttrContext> localEnv = |
| env.dup(tree, env.info.dup(env.info.scope.dupUnshared())); |
| localEnv.info.scope.owner = |
| new MethodSymbol(tree.flags | BLOCK, names.empty, null, |
| env.info.scope.owner); |
| if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; |
| attribStats(tree.stats, localEnv); |
| } else { |
| // Create a new local environment with a local scope. |
| Env<AttrContext> localEnv = |
| env.dup(tree, env.info.dup(env.info.scope.dup())); |
| attribStats(tree.stats, localEnv); |
| 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())); |
| 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); |
| loopEnv.info.scope.leave(); |
| result = null; |
| } |
| |
| public void visitForeachLoop(JCEnhancedForLoop tree) { |
| Env<AttrContext> loopEnv = |
| env.dup(env.tree, env.info.dup(env.info.scope.dup())); |
| attribStat(tree.var, loopEnv); |
| Type exprType = types.upperBound(attribExpr(tree.expr, 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"); |
| elemtype = syms.errType; |
| } else { |
| List<Type> iterableParams = base.allparams(); |
| elemtype = iterableParams.isEmpty() |
| ? syms.objectType |
| : types.upperBound(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); |
| loopEnv.info.scope.leave(); |
| result = null; |
| } |
| |
| public void visitLabelled(JCLabeledStatement tree) { |
| // Check that label is not used in an enclosing statement |
| Env<AttrContext> env1 = env; |
| while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) { |
| if (env1.tree.getTag() == JCTree.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())); |
| |
| boolean enumSwitch = |
| allowEnums && |
| (seltype.tsym.flags() & Flags.ENUM) != 0; |
| if (!enumSwitch) |
| 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<Object>(); // 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; |
| Env<AttrContext> caseEnv = |
| switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); |
| if (c.pat != null) { |
| if (enumSwitch) { |
| Symbol sym = enumConstant(c.pat, seltype); |
| if (sym == null) { |
| log.error(c.pat.pos(), "enum.const.req"); |
| } else if (!labels.add(sym)) { |
| log.error(c.pos(), "duplicate.case.label"); |
| } |
| } else { |
| Type pattype = attribExpr(c.pat, switchEnv, seltype); |
| if (pattype.tag != ERROR) { |
| if (pattype.constValue() == null) { |
| log.error(c.pat.pos(), "const.expr.req"); |
| } else if (labels.contains(pattype.constValue())) { |
| log.error(c.pos(), "duplicate.case.label"); |
| } else { |
| labels.add(pattype.constValue()); |
| } |
| } |
| } |
| } else if (hasDefault) { |
| log.error(c.pos(), "duplicate.default.label"); |
| } else { |
| hasDefault = true; |
| } |
| attribStats(c.stats, caseEnv); |
| caseEnv.info.scope.leave(); |
| addVars(c.stats, switchEnv.info.scope); |
| } |
| |
| switchEnv.info.scope.leave(); |
| result = null; |
| } |
| // where |
| /** Add any variables defined in stats to the switch scope. */ |
| private static void addVars(List<JCStatement> stats, Scope switchScope) { |
| for (;stats.nonEmpty(); stats = stats.tail) { |
| JCTree stat = stats.head; |
| if (stat.getTag() == JCTree.VARDEF) |
| switchScope.enter(((JCVariableDecl) stat).sym); |
| } |
| } |
| // where |
| /** Return the selected enumeration constant symbol, or null. */ |
| private Symbol enumConstant(JCTree tree, Type enumType) { |
| if (tree.getTag() != JCTree.IDENT) { |
| log.error(tree.pos(), "enum.label.must.be.unqualified.enum"); |
| return syms.errSymbol; |
| } |
| JCIdent ident = (JCIdent)tree; |
| Name name = ident.name; |
| for (Scope.Entry e = enumType.tsym.members().lookup(name); |
| e.scope != null; e = e.next()) { |
| if (e.sym.kind == VAR) { |
| Symbol s = ident.sym = e.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) { |
| // Attribute body |
| attribStat(tree.body, env.dup(tree, env.info.dup())); |
| |
| // Attribute catch clauses |
| for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { |
| JCCatch c = l.head; |
| Env<AttrContext> catchEnv = |
| env.dup(c, env.info.dup(env.info.scope.dup())); |
| Type ctype = attribStat(c.param, catchEnv); |
| if (c.param.type.tsym.kind == Kinds.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); |
| catchEnv.info.scope.leave(); |
| } |
| |
| // Attribute finalizer |
| if (tree.finalizer != null) attribStat(tree.finalizer, env); |
| result = null; |
| } |
| |
| public void visitConditional(JCConditional tree) { |
| attribExpr(tree.cond, env, syms.booleanType); |
| attribExpr(tree.truepart, env); |
| attribExpr(tree.falsepart, env); |
| result = check(tree, |
| capture(condType(tree.pos(), tree.cond.type, |
| tree.truepart.type, tree.falsepart.type)), |
| VAL, pkind, pt); |
| } |
| //where |
| /** Compute the type of a conditional expression, after |
| * checking that it exists. See Spec 15.25. |
| * |
| * @param pos The source position to be used for |
| * error diagnostics. |
| * @param condtype The type of the expression's condition. |
| * @param thentype The type of the expression's then-part. |
| * @param elsetype The type of the expression's else-part. |
| */ |
| private Type condType(DiagnosticPosition pos, |
| Type condtype, |
| Type thentype, |
| Type elsetype) { |
| Type ctype = condType1(pos, condtype, thentype, elsetype); |
| |
| // If condition and both arms are numeric constants, |
| // evaluate at compile-time. |
| return ((condtype.constValue() != null) && |
| (thentype.constValue() != null) && |
| (elsetype.constValue() != null)) |
| ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype) |
| : ctype; |
| } |
| /** Compute the type of a conditional expression, after |
| * checking that it exists. 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 condtype The type of the expression's condition. |
| * @param thentype The type of the expression's then-part. |
| * @param elsetype The type of the expression's else-part. |
| */ |
| private Type condType1(DiagnosticPosition pos, Type condtype, |
| Type thentype, Type elsetype) { |
| // If same type, that is the result |
| if (types.isSameType(thentype, elsetype)) |
| return thentype.baseType(); |
| |
| Type thenUnboxed = (!allowBoxing || thentype.isPrimitive()) |
| ? thentype : types.unboxedType(thentype); |
| Type elseUnboxed = (!allowBoxing || 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.tag < INT && elseUnboxed.tag == INT && |
| types.isAssignable(elseUnboxed, thenUnboxed)) |
| return thenUnboxed.baseType(); |
| if (elseUnboxed.tag < INT && thenUnboxed.tag == INT && |
| types.isAssignable(thenUnboxed, elseUnboxed)) |
| return elseUnboxed.baseType(); |
| |
| for (int i = BYTE; i < VOID; i++) { |
| Type candidate = syms.typeOfTag[i]; |
| if (types.isSubtype(thenUnboxed, candidate) && |
| types.isSubtype(elseUnboxed, candidate)) |
| return candidate; |
| } |
| } |
| |
| // Those were all the cases that could result in a primitive |
| if (allowBoxing) { |
| 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 (!allowBoxing || thentype.tag == VOID || elsetype.tag == 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()); |
| } |
| |
| 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) { |
| attribExpr(tree.expr, env); |
| 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, |
| int 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 JCTree.LABELLED: |
| JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; |
| if (label == labelled.label) { |
| // If jump is a continue, check that target is a loop. |
| if (tag == JCTree.CONTINUE) { |
| if (labelled.body.getTag() != JCTree.DOLOOP && |
| labelled.body.getTag() != JCTree.WHILELOOP && |
| labelled.body.getTag() != JCTree.FORLOOP && |
| labelled.body.getTag() != JCTree.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 JCTree.DOLOOP: |
| case JCTree.WHILELOOP: |
| case JCTree.FORLOOP: |
| case JCTree.FOREACHLOOP: |
| if (label == null) return env1.tree; |
| break; |
| case JCTree.SWITCH: |
| if (label == null && tag == JCTree.BREAK) return env1.tree; |
| break; |
| case JCTree.METHODDEF: |
| case JCTree.CLASSDEF: |
| break LOOP; |
| default: |
| } |
| env1 = env1.next; |
| } |
| if (label != null) |
| log.error(pos, "undef.label", label); |
| else if (tag == JCTree.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.enclMethod == null || |
| env.enclMethod.sym.owner != env.enclClass.sym) { |
| 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. |
| Symbol m = env.enclMethod.sym; |
| if (m.type.getReturnType().tag == VOID) { |
| if (tree.expr != null) |
| log.error(tree.expr.pos(), |
| "cant.ret.val.from.meth.decl.void"); |
| } else if (tree.expr == null) { |
| log.error(tree.pos(), "missing.ret.val"); |
| } else { |
| attribExpr(tree.expr, env, m.type.getReturnType()); |
| } |
| } |
| result = null; |
| } |
| |
| public void visitThrow(JCThrow tree) { |
| attribExpr(tree.expr, env, 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; |
| |
| 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. |
| argtypes = attribArgs(tree.args, localEnv); |
| 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 = syms.errType; |
| } else { |
| site = types.supertype(site); |
| } |
| } |
| |
| if (site.tag == CLASS) { |
| if (site.getEnclosingType().tag == CLASS) { |
| // we are calling a nested class |
| |
| if (tree.meth.getTag() == JCTree.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, |
| site.getEnclosingType())); |
| } else if (methName == names._super) { |
| // qualifier omitted; check for existence |
| // of an appropriate implicit qualifier. |
| rs.resolveImplicitThis(tree.meth.pos(), |
| localEnv, site); |
| } |
| } else if (tree.meth.getTag() == JCTree.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 && allowEnums) |
| 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.varArgs = false; |
| 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 = newMethTemplate(argtypes, typeargtypes); |
| checkId(tree.meth, site, sym, localEnv, MTH, |
| mpt, tree.varargsElement != null); |
| } |
| // 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, ... |
| argtypes = attribArgs(tree.args, localEnv); |
| typeargtypes = attribTypes(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 = newMethTemplate(argtypes, typeargtypes); |
| localEnv.info.varArgs = false; |
| Type mtype = attribExpr(tree.meth, localEnv, mpt); |
| if (localEnv.info.varArgs) |
| assert mtype.isErroneous() || tree.varargsElement != null; |
| |
| // Compute the result type. |
| Type restype = mtype.getReturnType(); |
| assert restype.tag != WILDCARD : mtype; |
| |
| // as a special case, array.clone() has a result that is |
| // the same as static type of the array being cloned |
| if (tree.meth.getTag() == JCTree.SELECT && |
| allowCovariantReturns && |
| methName == names.clone && |
| types.isArray(((JCFieldAccess) tree.meth).selected.type)) |
| restype = ((JCFieldAccess) tree.meth).selected.type; |
| |
| // as a special case, x.getClass() has type Class<? extends |X|> |
| if (allowGenerics && |
| methName == names.getClass && tree.args.isEmpty()) { |
| Type qualifier = (tree.meth.getTag() == JCTree.SELECT) |
| ? ((JCFieldAccess) tree.meth).selected.type |
| : env.enclClass.sym.type; |
| restype = new |
| ClassType(restype.getEnclosingType(), |
| List.<Type>of(new WildcardType(types.erasure(qualifier), |
| BoundKind.EXTENDS, |
| syms.boundClass)), |
| restype.tsym); |
| } |
| |
| // Check that value of resulting type is admissible in the |
| // current context. Also, capture the return type |
| result = check(tree, capture(restype), VAL, pkind, pt); |
| } |
| chk.validate(tree.typeargs); |
| } |
| //where |
| /** 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.getTag() == JCTree.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 newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) { |
| MethodType mt = new MethodType(argtypes, null, null, syms.methodClass); |
| return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); |
| } |
| |
| public void visitNewClass(JCNewClass tree) { |
| Type owntype = syms.errType; |
| |
| // 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 |
| (clazz.getTag() == JCTree.TYPEAPPLY) |
| ? ((JCTypeApply) clazz).clazz |
| : 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)); |
| clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), |
| ((JCIdent) clazzid).name); |
| if (clazz.getTag() == JCTree.TYPEAPPLY) |
| clazz = make.at(tree.pos). |
| TypeApply(clazzid1, |
| ((JCTypeApply) clazz).arguments); |
| else |
| clazz = clazzid1; |
| // System.out.println(clazz + " generated.");//DEBUG |
| } |
| |
| // Attribute clazz expression and store |
| // symbol + type back into the attributed tree. |
| Type clazztype = chk.checkClassType( |
| tree.clazz.pos(), attribType(clazz, env), true); |
| chk.validate(clazz); |
| 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 (!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().tag == CLASS) { |
| // Check for the existence of an apropos outer instance |
| rs.resolveImplicitThis(tree.pos(), env, clazztype); |
| } |
| |
| // Attribute constructor arguments. |
| List<Type> argtypes = attribArgs(tree.args, localEnv); |
| List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); |
| |
| // If we have made no mistakes in the class type... |
| if (clazztype.tag == CLASS) { |
| // Enums may not be instantiated except implicitly |
| if (allowEnums && |
| (clazztype.tsym.flags_field&Flags.ENUM) != 0 && |
| (env.tree.getTag() != JCTree.VARDEF || |
| (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 || |
| ((JCVariableDecl) env.tree).init != tree)) |
| log.error(tree.pos(), "enum.cant.be.instantiated"); |
| // Check that class is not abstract |
| if (cdef == null && |
| (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { |
| log.error(tree.pos(), "abstract.cant.be.instantiated", |
| clazztype.tsym); |
| } 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(); |
| } |
| |
| // Resolve the called constructor under the assumption |
| // that we are referring to a superclass instance of the |
| // current instance (JLS ???). |
| else { |
| localEnv.info.selectSuper = cdef != null; |
| localEnv.info.varArgs = false; |
| tree.constructor = rs.resolveConstructor( |
| tree.pos(), localEnv, clazztype, argtypes, typeargtypes); |
| Type ctorType = checkMethod(clazztype, |
| tree.constructor, |
| localEnv, |
| tree.args, |
| argtypes, |
| typeargtypes, |
| localEnv.info.varArgs); |
| if (localEnv.info.varArgs) |
| assert ctorType.isErroneous() || tree.varargsElement != null; |
| } |
| |
| if (cdef != null) { |
| // 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 a STATIC flag to the class definition |
| // if the current environment is static |
| // (2) add an extends or implements clause |
| // (3) 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) |
| // } |
| // ... |
| // } |
| if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC; |
| |
| if (clazztype.tsym.isInterface()) { |
| cdef.implementing = List.of(clazz); |
| } else { |
| cdef.extending = clazz; |
| } |
| |
| attribStat(cdef, localEnv); |
| |
| // 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)); |
| argtypes = argtypes.prepend(tree.encl.type); |
| tree.encl = null; |
| } |
| |
| // Reassign clazztype and recompute constructor. |
| clazztype = cdef.sym.type; |
| Symbol sym = rs.resolveConstructor( |
| tree.pos(), localEnv, clazztype, argtypes, |
| typeargtypes, true, tree.varargsElement != null); |
| assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous(); |
| tree.constructor = sym; |
| } |
| |
| if (tree.constructor != null && tree.constructor.kind == MTH) |
| owntype = clazztype; |
| } |
| result = check(tree, owntype, VAL, pkind, pt); |
| chk.validate(tree.typeargs); |
| } |
| |
| /** Make an attributed null check tree. |
| */ |
| public JCExpression makeNullCheck(JCExpression arg) { |
| // optimization: X.this is never null; skip null check |
| Name name = TreeInfo.name(arg); |
| if (name == names._this || name == names._super) return arg; |
| |
| int optag = JCTree.NULLCHK; |
| JCUnary tree = make.at(arg.pos).Unary(optag, arg); |
| tree.operator = syms.nullcheck; |
| tree.type = arg.type; |
| return tree; |
| } |
| |
| public void visitNewArray(JCNewArray tree) { |
| Type owntype = syms.errType; |
| Type elemtype; |
| if (tree.elemtype != null) { |
| elemtype = attribType(tree.elemtype, env); |
| chk.validate(tree.elemtype); |
| owntype = elemtype; |
| for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { |
| attribExpr(l.head, env, 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.tag == ARRAY) { |
| elemtype = types.elemtype(pt); |
| } else { |
| if (pt.tag != ERROR) { |
| log.error(tree.pos(), "illegal.initializer.for.type", |
| pt); |
| } |
| elemtype = syms.errType; |
| } |
| } |
| if (tree.elems != null) { |
| attribExprs(tree.elems, env, elemtype); |
| owntype = new ArrayType(elemtype, syms.arrayClass); |
| } |
| if (!types.isReifiable(elemtype)) |
| log.error(tree.pos(), "generic.array.creation"); |
| result = check(tree, owntype, VAL, pkind, pt); |
| } |
| |
| public void visitParens(JCParens tree) { |
| Type owntype = attribTree(tree.expr, env, pkind, pt); |
| result = check(tree, owntype, pkind, pkind, pt); |
| Symbol sym = TreeInfo.symbol(tree); |
| if (sym != null && (sym.kind&(TYP|PCK)) != 0) |
| log.error(tree.pos(), "illegal.start.of.type"); |
| } |
| |
| public void visitAssign(JCAssign tree) { |
| Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType); |
| Type capturedType = capture(owntype); |
| attribExpr(tree.rhs, env, owntype); |
| result = check(tree, capturedType, VAL, pkind, pt); |
| } |
| |
| public void visitAssignop(JCAssignOp tree) { |
| // Attribute arguments. |
| Type owntype = attribTree(tree.lhs, env, VAR, Type.noType); |
| Type operand = attribExpr(tree.rhs, env); |
| // Find operator. |
| Symbol operator = tree.operator = rs.resolveBinaryOperator( |
| tree.pos(), tree.getTag() - JCTree.ASGOffset, env, |
| owntype, operand); |
| |
| if (operator.kind == MTH) { |
| chk.checkOperator(tree.pos(), |
| (OperatorSymbol)operator, |
| tree.getTag() - JCTree.ASGOffset, |
| owntype, |
| operand); |
| if (types.isSameType(operator.type.getReturnType(), syms.stringType)) { |
| // String assignment; make sure the lhs is a string |
| chk.checkType(tree.lhs.pos(), |
| owntype, |
| syms.stringType); |
| } else { |
| chk.checkDivZero(tree.rhs.pos(), operator, operand); |
| chk.checkCastable(tree.rhs.pos(), |
| operator.type.getReturnType(), |
| owntype); |
| } |
| } |
| result = check(tree, owntype, VAL, pkind, pt); |
| } |
| |
| public void visitUnary(JCUnary tree) { |
| // Attribute arguments. |
| Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC) |
| ? attribTree(tree.arg, env, VAR, Type.noType) |
| : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); |
| |
| // Find operator. |
| Symbol operator = tree.operator = |
| rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype); |
| |
| Type owntype = syms.errType; |
| if (operator.kind == MTH) { |
| owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC) |
| ? 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); |
| |
| // Remove constant types from arguments to |
| // conserve space. The parser will fold concatenations |
| // of string literals; the code here also |
| // gets rid of intermediate results when some of the |
| // operands are constant identifiers. |
| if (tree.arg.type.tsym == syms.stringType.tsym) { |
| tree.arg.type = syms.stringType; |
| } |
| } |
| } |
| } |
| result = check(tree, owntype, VAL, pkind, pt); |
| } |
| |
| public void visitBinary(JCBinary tree) { |
| // Attribute arguments. |
| Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); |
| Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env)); |
| |
| // Find operator. |
| Symbol operator = tree.operator = |
| rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right); |
| |
| Type owntype = syms.errType; |
| if (operator.kind == MTH) { |
| owntype = operator.type.getReturnType(); |
| int opc = chk.checkOperator(tree.lhs.pos(), |
| (OperatorSymbol)operator, |
| tree.getTag(), |
| left, |
| right); |
| |
| // 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); |
| |
| // Remove constant types from arguments to |
| // conserve space. The parser will fold concatenations |
| // of string literals; the code here also |
| // gets rid of intermediate results when some of the |
| // operands are constant identifiers. |
| if (tree.lhs.type.tsym == syms.stringType.tsym) { |
| tree.lhs.type = syms.stringType; |
| } |
| if (tree.rhs.type.tsym == syms.stringType.tsym) { |
| tree.rhs.type = syms.stringType; |
| } |
| } |
| } |
| |
| // Check that argument types of a reference ==, != are |
| // castable to each other, (JLS???). |
| 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, VAL, pkind, pt); |
| } |
| |
| public void visitTypeCast(JCTypeCast tree) { |
| Type clazztype = attribType(tree.clazz, env); |
| Type exprtype = attribExpr(tree.expr, env, Infer.anyPoly); |
| Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype); |
| if (exprtype.constValue() != null) |
| owntype = cfolder.coerce(exprtype, owntype); |
| result = check(tree, capture(owntype), VAL, pkind, pt); |
| } |
| |
| public void visitTypeTest(JCInstanceOf tree) { |
| Type exprtype = chk.checkNullOrRefType( |
| tree.expr.pos(), attribExpr(tree.expr, env)); |
| Type clazztype = chk.checkReifiableReferenceType( |
| tree.clazz.pos(), attribType(tree.clazz, env)); |
| chk.checkCastable(tree.expr.pos(), exprtype, clazztype); |
| result = check(tree, syms.booleanType, VAL, pkind, pt); |
| } |
| |
| public void visitIndexed(JCArrayAccess tree) { |
| Type owntype = syms.errType; |
| Type atype = attribExpr(tree.indexed, env); |
| attribExpr(tree.index, env, syms.intType); |
| if (types.isArray(atype)) |
| owntype = types.elemtype(atype); |
| else if (atype.tag != ERROR) |
| log.error(tree.pos(), "array.req.but.found", atype); |
| if ((pkind & VAR) == 0) owntype = capture(owntype); |
| result = check(tree, owntype, VAR, pkind, pt); |
| } |
| |
| public void visitIdent(JCIdent tree) { |
| Symbol sym; |
| boolean varArgs = false; |
| |
| // Find symbol |
| if (pt.tag == METHOD || pt.tag == 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.varArgs = false; |
| sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments()); |
| varArgs = env.info.varArgs; |
| } 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 & (VAR | MTH | TYP)) != 0 && |
| 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 = !allowAnonOuterThis; |
| 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 symbol is a local variable accessed from an embedded |
| // inner class check that it is final. |
| if (v.owner.kind == MTH && |
| v.owner != env.info.scope.owner && |
| (v.flags_field & FINAL) == 0) { |
| log.error(tree.pos(), |
| "local.var.accessed.from.icls.needs.final", |
| v); |
| } |
| |
| // If we are expecting a variable (as opposed to a value), check |
| // that the variable is assignable in the current environment. |
| if (pkind == VAR) |
| 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 & (VAR | MTH)) != 0 && |
| 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.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; |
| } |
| result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs); |
| } |
| |
| public void visitSelect(JCFieldAccess tree) { |
| // Determine the expected kind of the qualifier expression. |
| int skind = 0; |
| if (tree.name == names._this || tree.name == names._super || |
| tree.name == names._class) |
| { |
| skind = TYP; |
| } else { |
| if ((pkind & PCK) != 0) skind = skind | PCK; |
| if ((pkind & TYP) != 0) skind = skind | TYP | PCK; |
| if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP; |
| } |
| |
| // Attribute the qualifier expression, and determine its symbol (if any). |
| Type site = attribTree(tree.selected, env, skind, Infer.anyPoly); |
| if ((pkind & (PCK | TYP)) == 0) |
| site = capture(site); // Capture field access |
| |
| // don't allow T.class T[].class, etc |
| if (skind == TYP) { |
| Type elt = site; |
| while (elt.tag == ARRAY) |
| elt = ((ArrayType)elt).elemtype; |
| if (elt.tag == TYPEVAR) { |
| log.error(tree.pos(), "type.var.cant.be.deref"); |
| result = syms.errType; |
| 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; |
| |
| // If selected expression is polymorphic, strip |
| // type parameters and remember in env.info.tvars, so that |
| // they can be added later (in Attr.checkId and Infer.instantiateMethod). |
| if (tree.selected.type.tag == FORALL) { |
| ForAll pstype = (ForAll)tree.selected.type; |
| env.info.tvars = pstype.tvars; |
| site = tree.selected.type = pstype.qtype; |
| } |
| |
| // Determine the symbol represented by the selection. |
| env.info.varArgs = false; |
| Symbol sym = selectSym(tree, site, env, pt, pkind); |
| if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) { |
| site = capture(site); |
| sym = selectSym(tree, site, env, pt, pkind); |
| } |
| boolean varArgs = env.info.varArgs; |
| tree.sym = sym; |
| |
| if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) |
| site = capture(site.getUpperBound()); |
| |
| // 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 (pkind == VAR) |
| checkAssignable(tree.pos(), v, tree.selected, env); |
| } |
| |
| // Disallow selecting a type from an expression |
| if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) { |
| tree.type = check(tree.selected, pt, |
| sitesym == null ? VAL : sitesym.kind, 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.access(rs.new StaticError(sym), |
| tree.pos(), site, sym.name, true); |
| } |
| } |
| } |
| |
| // 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; |
| } |
| } |
| |
| env.info.selectSuper = selectSuperPrev; |
| result = checkId(tree, site, sym, env, pkind, pt, varArgs); |
| env.info.tvars = List.nil(); |
| } |
| //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 pt The current prototype. |
| * @param pkind The expected kind(s) of the Select expression. |
| */ |
| private Symbol selectSym(JCFieldAccess tree, |
| Type site, |
| Env<AttrContext> env, |
| Type pt, |
| int pkind) { |
| DiagnosticPosition pos = tree.pos(); |
| Name name = tree.name; |
| |
| switch (site.tag) { |
| case PACKAGE: |
| return rs.access( |
| rs.findIdentInPackage(env, site.tsym, name, pkind), |
| pos, site, name, true); |
| case ARRAY: |
| case CLASS: |
| if (pt.tag == METHOD || pt.tag == FORALL) { |
| return rs.resolveQualifiedMethod( |
| pos, env, site, name, pt.getParameterTypes(), 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 = allowGenerics |
| ? List.of(types.erasure(site)) |
| : List.<Type>nil(); |
| 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, pkind); |
| if ((pkind & ERRONEOUS) == 0) |
| sym = rs.access(sym, pos, 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* be |
| // 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, capture(site.getUpperBound()), env, pt, pkind) |
| : null; |
| if (sym == null || isType(sym)) { |
| log.error(pos, "type.var.cant.be.deref"); |
| return syms.errSymbol; |
| } else { |
| return sym; |
| } |
| case ERROR: |
| // preserve identifier names through errors |
| return new ErrorType(name, site.tsym).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 pkind The set of expected kinds. |
| * @param pt The expected type. |
| */ |
| Type checkId(JCTree tree, |
| Type site, |
| Symbol sym, |
| Env<AttrContext> env, |
| int pkind, |
| Type pt, |
| boolean useVarargs) { |
| if (pt.isErroneous()) return syms.errType; |
| 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.tag == CLASS) { |
| 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.tag == CLASS && site != ownOuter) { |
| Type normOuter = site; |
| if (normOuter.tag == 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.<Type>nil(), owntype.tsym); |
| } |
| } |
| 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 (allowGenerics && |
| pkind == VAR && |
| v.owner.kind == TYP && |
| (v.flags() & STATIC) == 0 && |
| (site.tag == CLASS || site.tag == 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 (env.info.tvars.nonEmpty()) { |
| Type owntype1 = new ForAll(env.info.tvars, owntype); |
| for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail) |
| if (!owntype.contains(l.head)) { |
| log.error(tree.pos(), "undetermined.type", owntype1); |
| owntype1 = syms.errType; |
| } |
| owntype = owntype1; |
| } |
| |
| // If the variable is a constant, record constant value in |
| // computed type. |
| if (v.getConstValue() != null && isStaticReference(tree)) |
| owntype = owntype.constType(v.getConstValue()); |
| |
| if (pkind == VAL) { |
| owntype = capture(owntype); // capture "names as expressions" |
| } |
| break; |
| case MTH: { |
| JCMethodInvocation app = (JCMethodInvocation)env.tree; |
| owntype = checkMethod(site, sym, env, app.args, |
| pt.getParameterTypes(), pt.getTypeArguments(), |
| env.info.varArgs); |
| break; |
| } |
| case PCK: case ERR: |
| owntype = sym.type; |
| break; |
| default: |
| throw new AssertionError("unexpected kind: " + sym.kind + |
| " in tree " + tree); |
| } |
| |
| // Test (1): emit a `deprecation' warning if symbol is deprecated. |
| // (for constructors, the error was given when the constructor was |
| // resolved) |
| if (sym.name != names.init && |
| (sym.flags() & DEPRECATED) != 0 && |
| (env.info.scope.owner.flags() & DEPRECATED) == 0 && |
| sym.outermostClass() != env.info.scope.owner.outermostClass()) |
| chk.warnDeprecated(tree.pos(), sym); |
| |
| if ((sym.flags() & PROPRIETARY) != 0) |
| log.strictWarning(tree.pos(), "sun.proprietary", sym); |
| |
| // Test (3): if symbol is a variable, check that its type and |
| // kind are compatible with the prototype and protokind. |
| return check(tree, owntype, sym.kind, pkind, pt); |
| } |
| |
| /** 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) { |
| // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " + |
| // tree.pos + " " + v.pos + " " + |
| // Resolve.isStatic(env));//DEBUG |
| |
| // 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. |
| if (v.pos > tree.pos && |
| v.owner.kind == TYP && |
| canOwnInitializer(env.info.scope.owner) && |
| v.owner == env.info.scope.owner.enclClass() && |
| ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && |
| (env.tree.getTag() != JCTree.ASSIGN || |
| TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { |
| |
| if (!onlyWarning || isNonStaticEnumField(v)) { |
| log.error(tree.pos(), "illegal.forward.ref"); |
| } else if (useBeforeDeclarationWarning) { |
| log.warning(tree.pos(), "forward.ref", v); |
| } |
| } |
| |
| v.getConstValue(); // ensure initializer is evaluated |
| |
| checkEnumInitializer(tree, env, v); |
| } |
| |
| /** |
| * 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. |
| * @see JLS 3rd Ed. (8.9 Enums) |
| */ |
| private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { |
| // JLS 3rd Ed.: |
| // |
| // "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 (isNonStaticEnumField(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"); |
| } |
| } |
| |
| private boolean isNonStaticEnumField(VarSymbol v) { |
| return Flags.isEnum(v.owner) && Flags.isStatic(v) && !Flags.isConstant(v); |
| } |
| |
| /** Can the given symbol be the owner of code which forms part |
| * if class initialization? This is the case if the symbol is |
| * a type or field, or if the symbol is the synthetic method. |
| * owning a block. |
| */ |
| private boolean canOwnInitializer(Symbol sym) { |
| return |
| (sym.kind & (VAR | TYP)) != 0 || |
| (sym.kind == MTH && (sym.flags() & BLOCK) != 0); |
| } |
| |
| Warner noteWarner = new Warner(); |
| |
| /** |
| * Check that method arguments conform to its instantation. |
| **/ |
| public Type checkMethod(Type site, |
| Symbol sym, |
| Env<AttrContext> env, |
| final List<JCExpression> argtrees, |
| List<Type> argtypes, |
| List<Type> typeargtypes, |
| boolean useVarargs) { |
| // Test (5): if symbol is an instance method of a raw type, issue |
| // an unchecked warning if its argument types change under erasure. |
| if (allowGenerics && |
| (sym.flags() & STATIC) == 0 && |
| (site.tag == CLASS || site.tag == 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); |
| } |
| } |
| |
| // 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. |
| noteWarner.warned = false; |
| Type owntype = rs.instantiate(env, |
| site, |
| sym, |
| argtypes, |
| typeargtypes, |
| true, |
| useVarargs, |
| noteWarner); |
| boolean warned = noteWarner.warned; |
| |
| // If this fails, something went wrong; we should not have |
| // found the identifier in the first place. |
| if (owntype == null) { |
| if (!pt.isErroneous()) |
| log.error(env.tree.pos(), |
| "internal.error.cant.instantiate", |
| sym, site, |
| Type.toString(pt.getParameterTypes())); |
| owntype = syms.errType; |
| } else { |
| // System.out.println("call : " + env.tree); |
| // System.out.println("method : " + owntype); |
| // System.out.println("actuals: " + argtypes); |
| List<Type> formals = owntype.getParameterTypes(); |
| Type last = useVarargs ? formals.last() : null; |
| if (sym.name==names.init && |
| sym.owner == syms.enumSym) |
| formals = formals.tail.tail; |
| List<JCExpression> args = argtrees; |
| while (formals.head != last) { |
| JCTree arg = args.head; |
| Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head); |
| assertConvertible(arg, arg.type, formals.head, warn); |
| warned |= warn.warned; |
| args = args.tail; |
| formals = formals.tail; |
| } |
| if (useVarargs) { |
| Type varArg = types.elemtype(last); |
| while (args.tail != null) { |
| JCTree arg = args.head; |
| Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg); |
| assertConvertible(arg, arg.type, varArg, warn); |
| warned |= warn.warned; |
| args = args.tail; |
| } |
| } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) { |
| // non-varargs call to varargs method |
| Type varParam = owntype.getParameterTypes().last(); |
| Type lastArg = argtypes.last(); |
| if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) && |
| !types.isSameType(types.erasure(varParam), types.erasure(lastArg))) |
| log.warning(argtrees.last().pos(), "inexact.non-varargs.call", |
| types.elemtype(varParam), |
| varParam); |
| } |
| |
| if (warned && sym.type.tag == FORALL) { |
| String typeargs = ""; |
| if (typeargtypes != null && typeargtypes.nonEmpty()) { |
| typeargs = "<" + Type.toString(typeargtypes) + ">"; |
| } |
| chk.warnUnchecked(env.tree.pos(), |
| "unchecked.meth.invocation.applied", |
| sym, |
| sym.location(), |
| typeargs, |
| Type.toString(argtypes)); |
| owntype = new MethodType(owntype.getParameterTypes(), |
| types.erasure(owntype.getReturnType()), |
| owntype.getThrownTypes(), |
| syms.methodClass); |
| } |
| if (useVarargs) { |
| JCTree tree = env.tree; |
| Type argtype = owntype.getParameterTypes().last(); |
| if (!types.isReifiable(argtype)) |
| chk.warnUnchecked(env.tree.pos(), |
| "unchecked.generic.array.creation", |
| argtype); |
| Type elemtype = types.elemtype(argtype); |
| switch (tree.getTag()) { |
| case JCTree.APPLY: |
| ((JCMethodInvocation) tree).varargsElement = elemtype; |
| break; |
| case JCTree.NEWCLASS: |
| ((JCNewClass) tree).varargsElement = elemtype; |
| break; |
| default: |
| throw new AssertionError(""+tree); |
| } |
| } |
| } |
| return owntype; |
| } |
| |
| private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) { |
| if (types.isConvertible(actual, formal, warn)) |
| return; |
| |
| if (formal.isCompound() |
| && types.isSubtype(actual, types.supertype(formal)) |
| && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn)) |
| return; |
| |
| if (false) { |
| // TODO: make assertConvertible work |
| chk.typeError(tree.pos(), JCDiagnostic.fragment("incompatible.types"), actual, formal); |
| throw new AssertionError("Tree: " + tree |
| + " actual:" + actual |
| + " formal: " + formal); |
| } |
| } |
| |
| public void visitLiteral(JCLiteral tree) { |
| result = check( |
| tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt); |
| } |
| //where |
| /** Return the type of a literal with given type tag. |
| */ |
| Type litType(int tag) { |
| return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag]; |
| } |
| |
| public void visitTypeIdent(JCPrimitiveTypeTree tree) { |
| result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt); |
| } |
| |
| public void visitTypeArray(JCArrayTypeTree tree) { |
| Type etype = attribType(tree.elemtype, env); |
| Type type = new ArrayType(etype, syms.arrayClass); |
| result = check(tree, type, TYP, pkind, pt); |
| } |
| |
| /** 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 = syms.errType; |
| |
| // 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.tag == CLASS) { |
| List<Type> formals = clazztype.tsym.type.getTypeArguments(); |
| |
| 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.tag == CLASS) { |
| Type site; |
| if (tree.clazz.getTag() == JCTree.IDENT) { |
| site = env.enclClass.sym.type; |
| } else if (tree.clazz.getTag() == JCTree.SELECT) { |
| site = ((JCFieldAccess) tree.clazz).selected.type; |
| } else throw new AssertionError(""+tree); |
| if (clazzOuter.tag == CLASS && site != clazzOuter) { |
| if (site.tag == CLASS) |
| site = types.asOuterSuper(site, clazzOuter.tsym); |
| if (site == null) |
| site = types.erasure(clazzOuter); |
| clazzOuter = site; |
| } |
| } |
| owntype = new ClassType(clazzOuter, actuals, clazztype.tsym); |
| } 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 = syms.errType; |
| } |
| } |
| result = check(tree, owntype, TYP, pkind, pt); |
| } |
| |
| public void visitTypeParameter(JCTypeParameter tree) { |
| TypeVar a = (TypeVar)tree.type; |
| Set<Type> boundSet = new HashSet<Type>(); |
| if (a.bound.isErroneous()) |
| return; |
| List<Type> bs = types.getBounds(a); |
| if (tree.bounds.nonEmpty()) { |
| // accept class or interface or typevar as first bound. |
| Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false); |
| boundSet.add(types.erasure(b)); |
| if (b.tag == TYPEVAR) { |
| // if first bound was a typevar, do not accept further bounds. |
| if (tree.bounds.tail.nonEmpty()) { |
| log.error(tree.bounds.tail.head.pos(), |
| "type.var.may.not.be.followed.by.other.bounds"); |
| tree.bounds = List.of(tree.bounds.head); |
| } |
| } else { |
| // if first bound was a class or interface, accept only interfaces |
| // as further bounds. |
| for (JCExpression bound : tree.bounds.tail) { |
| bs = bs.tail; |
| Type i = checkBase(bs.head, bound, env, false, true, false); |
| if (i.tag == CLASS) |
| chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet); |
| } |
| } |
| } |
| bs = types.getBounds(a); |
| |
| // in case of multiple bounds ... |
| if (bs.length() > 1) { |
| // ... 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, ... |
| JCTree extending; |
| List<JCExpression> implementing; |
| if ((bs.head.tsym.flags() & INTERFACE) == 0) { |
| extending = tree.bounds.head; |
| implementing = tree.bounds.tail; |
| } else { |
| extending = null; |
| implementing = tree.bounds; |
| } |
| JCClassDecl cd = make.at(tree.pos).ClassDef( |
| make.Modifiers(PUBLIC | ABSTRACT), |
| tree.name, List.<JCTypeParameter>nil(), |
| extending, implementing, List.<JCTree>nil()); |
| |
| ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym; |
| assert (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); |
| enter.typeEnvs.put(c, cenv); |
| } |
| } |
| |
| |
| 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), |
| TYP, pkind, pt); |
| } |
| |
| public void visitAnnotation(JCAnnotation tree) { |
| log.error(tree.pos(), "annotation.not.valid.for.type", pt); |
| result = tree.type = syms.errType; |
| } |
| |
| public void visitErroneous(JCErroneous tree) { |
| if (tree.errs != null) |
| for (JCTree err : tree.errs) |
| attribTree(err, env, ERR, pt); |
| result = tree.type = syms.errType; |
| } |
| |
| /** Default visitor method for all other trees. |
| */ |
| public void visitTree(JCTree tree) { |
| throw new AssertionError(); |
| } |
| |
| /** 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.tag == 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.tag == CLASS) |
| attribClass((ClassSymbol)st.tsym); |
| |
| // Next attribute owner, if it is a class. |
| if (c.owner.kind == TYP && c.owner.type.tag == 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 = enter.typeEnvs.get(c); |
| |
| // The info.lint field in the envs stored in enter.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.attributes_field, c.flags()); |
| |
| Lint prevLint = chk.setLint(env.info.lint); |
| JavaFileObject prev = log.useSource(c.sourcefile); |
| |
| try { |
| // 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) == 0) && |
| !target.compilerBootstrap(c)) { |
| log.error(env.tree.pos(), "enum.types.not.extensible"); |
| } |
| attribClassBody(env, c); |
| |
| chk.checkDeprecatedAnnotation(env.tree.pos(), c); |
| } finally { |
| log.useSource(prev); |
| chk.setLint(prevLint); |
| } |
| |
| } |
| } |
| |
| public void visitImport(JCImport tree) { |
| // nothing to do |
| } |
| |
| /** Finish the attribution of a class. */ |
| private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { |
| JCClassDecl tree = (JCClassDecl)env.tree; |
| assert c == tree.sym; |
| |
| // Validate annotations |
| chk.validateAnnotations(tree.mods.annotations, c); |
| |
| // Validate type parameters, supertype and interfaces. |
| attribBounds(tree.typarams); |
| chk.validateTypeParams(tree.typarams); |
| chk.validate(tree.extending); |
| chk.validate(tree.implementing); |
| |
| // 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) { |
| if (!relax) |
| 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"); |
| } 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); |
| } |
| |
| // 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; |
| |
| boolean assertsEnabled = false; |
| assert assertsEnabled = true; |
| if (assertsEnabled) { |
| for (List<JCTypeParameter> l = tree.typarams; |
| l.nonEmpty(); l = l.tail) |
| assert env.info.scope.lookup(l.head.name).scope != null; |
| } |
| |
| // 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); |
| |
| 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.getTag() == JCTree.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"); |
| } |
| } |
| |
| // 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(Lint.LintCategory.SERIAL) && |
| isSerializable(c) && |
| (c.flags() & Flags.ENUM) == 0 && |
| (c.flags() & ABSTRACT) == 0) { |
| checkSerialVersionUID(tree, c); |
| } |
| } |
| // where |
| /** check if a class is a subtype of Serializable, if that is available. */ |
| private boolean isSerializable(ClassSymbol c) { |
| try { |
| syms.serializableType.complete(); |
| } |
| catch (CompletionFailure e) { |
| return false; |
| } |
| return types.isSubtype(c.type, syms.serializableType); |
| } |
| |
| /** Check that an appropriate serialVersionUID member is defined. */ |
| private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { |
| |
| // check for presence of serialVersionUID |
| Scope.Entry e = c.members().lookup(names.serialVersionUID); |
| while (e.scope != null && e.sym.kind != VAR) e = e.next(); |
| if (e.scope == null) { |
| log.warning(tree.pos(), "missing.SVUID", c); |
| return; |
| } |
| |
| // check that it is static final |
| VarSymbol svuid = (VarSymbol)e.sym; |
| if ((svuid.flags() & (STATIC | FINAL)) != |
| (STATIC | FINAL)) |
| log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); |
| |
| // check that it is long |
| else if (svuid.type.tag != TypeTags.LONG) |
| log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); |
| |
| // check constant |
| else if (svuid.getConstValue() == null) |
| log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); |
| } |
| |
| private Type capture(Type type) { |
| return types.capture(type); |
| } |
| } |