--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/comp/Attr.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,2810 @@
+/*
+ * 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);
+ }
+}