duke@1: /*
xdono@54:  * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1:  *
duke@1:  * This code is free software; you can redistribute it and/or modify it
duke@1:  * under the terms of the GNU General Public License version 2 only, as
duke@1:  * published by the Free Software Foundation.  Sun designates this
duke@1:  * particular file as subject to the "Classpath" exception as provided
duke@1:  * by Sun in the LICENSE file that accompanied this code.
duke@1:  *
duke@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@1:  * version 2 for more details (a copy is included in the LICENSE file that
duke@1:  * accompanied this code).
duke@1:  *
duke@1:  * You should have received a copy of the GNU General Public License version
duke@1:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1:  *
duke@1:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@1:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@1:  * have any questions.
duke@1:  */
duke@1: 
duke@1: package com.sun.tools.javac.comp;
duke@1: 
duke@1: import java.util.*;
duke@1: import java.util.Set;
duke@1: import javax.lang.model.element.ElementKind;
duke@1: import javax.tools.JavaFileObject;
duke@1: 
duke@1: import com.sun.tools.javac.code.*;
duke@1: import com.sun.tools.javac.jvm.*;
duke@1: import com.sun.tools.javac.tree.*;
duke@1: import com.sun.tools.javac.util.*;
duke@1: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
duke@1: import com.sun.tools.javac.util.List;
duke@1: 
duke@1: import com.sun.tools.javac.jvm.Target;
duke@1: import com.sun.tools.javac.code.Symbol.*;
duke@1: import com.sun.tools.javac.tree.JCTree.*;
duke@1: import com.sun.tools.javac.code.Type.*;
duke@1: 
duke@1: import com.sun.source.tree.IdentifierTree;
duke@1: import com.sun.source.tree.MemberSelectTree;
duke@1: import com.sun.source.tree.TreeVisitor;
duke@1: import com.sun.source.util.SimpleTreeVisitor;
duke@1: 
duke@1: import static com.sun.tools.javac.code.Flags.*;
duke@1: import static com.sun.tools.javac.code.Kinds.*;
duke@1: import static com.sun.tools.javac.code.TypeTags.*;
duke@1: 
duke@1: /** This is the main context-dependent analysis phase in GJC. It
duke@1:  *  encompasses name resolution, type checking and constant folding as
duke@1:  *  subtasks. Some subtasks involve auxiliary classes.
duke@1:  *  @see Check
duke@1:  *  @see Resolve
duke@1:  *  @see ConstFold
duke@1:  *  @see Infer
duke@1:  *
duke@1:  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
duke@1:  *  you write code that depends on this, you do so at your own risk.
duke@1:  *  This code and its internal interfaces are subject to change or
duke@1:  *  deletion without notice.</b>
duke@1:  */
duke@1: public class Attr extends JCTree.Visitor {
duke@1:     protected static final Context.Key<Attr> attrKey =
duke@1:         new Context.Key<Attr>();
duke@1: 
jjg@113:     final Names names;
duke@1:     final Log log;
duke@1:     final Symtab syms;
duke@1:     final Resolve rs;
duke@1:     final Check chk;
duke@1:     final MemberEnter memberEnter;
duke@1:     final TreeMaker make;
duke@1:     final ConstFold cfolder;
duke@1:     final Enter enter;
duke@1:     final Target target;
duke@1:     final Types types;
mcimadamore@89:     final JCDiagnostic.Factory diags;
duke@1:     final Annotate annotate;
duke@1: 
duke@1:     public static Attr instance(Context context) {
duke@1:         Attr instance = context.get(attrKey);
duke@1:         if (instance == null)
duke@1:             instance = new Attr(context);
duke@1:         return instance;
duke@1:     }
duke@1: 
duke@1:     protected Attr(Context context) {
duke@1:         context.put(attrKey, this);
duke@1: 
jjg@113:         names = Names.instance(context);
duke@1:         log = Log.instance(context);
duke@1:         syms = Symtab.instance(context);
duke@1:         rs = Resolve.instance(context);
duke@1:         chk = Check.instance(context);
duke@1:         memberEnter = MemberEnter.instance(context);
duke@1:         make = TreeMaker.instance(context);
duke@1:         enter = Enter.instance(context);
duke@1:         cfolder = ConstFold.instance(context);
duke@1:         target = Target.instance(context);
duke@1:         types = Types.instance(context);
mcimadamore@89:         diags = JCDiagnostic.Factory.instance(context);
duke@1:         annotate = Annotate.instance(context);
duke@1: 
duke@1:         Options options = Options.instance(context);
duke@1: 
duke@1:         Source source = Source.instance(context);
duke@1:         allowGenerics = source.allowGenerics();
duke@1:         allowVarargs = source.allowVarargs();
duke@1:         allowEnums = source.allowEnums();
duke@1:         allowBoxing = source.allowBoxing();
duke@1:         allowCovariantReturns = source.allowCovariantReturns();
duke@1:         allowAnonOuterThis = source.allowAnonOuterThis();
duke@1:         relax = (options.get("-retrofit") != null ||
duke@1:                  options.get("-relax") != null);
duke@1:         useBeforeDeclarationWarning = options.get("useBeforeDeclarationWarning") != null;
duke@1:     }
duke@1: 
duke@1:     /** Switch: relax some constraints for retrofit mode.
duke@1:      */
duke@1:     boolean relax;
duke@1: 
duke@1:     /** Switch: support generics?
duke@1:      */
duke@1:     boolean allowGenerics;
duke@1: 
duke@1:     /** Switch: allow variable-arity methods.
duke@1:      */
duke@1:     boolean allowVarargs;
duke@1: 
duke@1:     /** Switch: support enums?
duke@1:      */
duke@1:     boolean allowEnums;
duke@1: 
duke@1:     /** Switch: support boxing and unboxing?
duke@1:      */
duke@1:     boolean allowBoxing;
duke@1: 
duke@1:     /** Switch: support covariant result types?
duke@1:      */
duke@1:     boolean allowCovariantReturns;
duke@1: 
duke@1:     /** Switch: allow references to surrounding object from anonymous
duke@1:      * objects during constructor call?
duke@1:      */
duke@1:     boolean allowAnonOuterThis;
duke@1: 
duke@1:     /**
duke@1:      * Switch: warn about use of variable before declaration?
duke@1:      * RFE: 6425594
duke@1:      */
duke@1:     boolean useBeforeDeclarationWarning;
duke@1: 
duke@1:     /** Check kind and type of given tree against protokind and prototype.
duke@1:      *  If check succeeds, store type in tree and return it.
duke@1:      *  If check fails, store errType in tree and return it.
duke@1:      *  No checks are performed if the prototype is a method type.
jjg@110:      *  It is not necessary in this case since we know that kind and type
duke@1:      *  are correct.
duke@1:      *
duke@1:      *  @param tree     The tree whose kind and type is checked
duke@1:      *  @param owntype  The computed type of the tree
duke@1:      *  @param ownkind  The computed kind of the tree
duke@1:      *  @param pkind    The expected kind (or: protokind) of the tree
duke@1:      *  @param pt       The expected type (or: prototype) of the tree
duke@1:      */
duke@1:     Type check(JCTree tree, Type owntype, int ownkind, int pkind, Type pt) {
duke@1:         if (owntype.tag != ERROR && pt.tag != METHOD && pt.tag != FORALL) {
duke@1:             if ((ownkind & ~pkind) == 0) {
duke@1:                 owntype = chk.checkType(tree.pos(), owntype, pt);
duke@1:             } else {
duke@1:                 log.error(tree.pos(), "unexpected.type",
mcimadamore@80:                           kindNames(pkind),
mcimadamore@80:                           kindName(ownkind));
jjg@110:                 owntype = types.createErrorType(owntype);
duke@1:             }
duke@1:         }
duke@1:         tree.type = owntype;
duke@1:         return owntype;
duke@1:     }
duke@1: 
duke@1:     /** Is given blank final variable assignable, i.e. in a scope where it
duke@1:      *  may be assigned to even though it is final?
duke@1:      *  @param v      The blank final variable.
duke@1:      *  @param env    The current environment.
duke@1:      */
duke@1:     boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
duke@1:         Symbol owner = env.info.scope.owner;
duke@1:            // owner refers to the innermost variable, method or
duke@1:            // initializer block declaration at this point.
duke@1:         return
duke@1:             v.owner == owner
duke@1:             ||
duke@1:             ((owner.name == names.init ||    // i.e. we are in a constructor
duke@1:               owner.kind == VAR ||           // i.e. we are in a variable initializer
duke@1:               (owner.flags() & BLOCK) != 0)  // i.e. we are in an initializer block
duke@1:              &&
duke@1:              v.owner == owner.owner
duke@1:              &&
duke@1:              ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
duke@1:     }
duke@1: 
duke@1:     /** Check that variable can be assigned to.
duke@1:      *  @param pos    The current source code position.
duke@1:      *  @param v      The assigned varaible
duke@1:      *  @param base   If the variable is referred to in a Select, the part
duke@1:      *                to the left of the `.', null otherwise.
duke@1:      *  @param env    The current environment.
duke@1:      */
duke@1:     void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
duke@1:         if ((v.flags() & FINAL) != 0 &&
duke@1:             ((v.flags() & HASINIT) != 0
duke@1:              ||
duke@1:              !((base == null ||
duke@1:                (base.getTag() == JCTree.IDENT && TreeInfo.name(base) == names._this)) &&
duke@1:                isAssignableAsBlankFinal(v, env)))) {
duke@1:             log.error(pos, "cant.assign.val.to.final.var", v);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Does tree represent a static reference to an identifier?
duke@1:      *  It is assumed that tree is either a SELECT or an IDENT.
duke@1:      *  We have to weed out selects from non-type names here.
duke@1:      *  @param tree    The candidate tree.
duke@1:      */
duke@1:     boolean isStaticReference(JCTree tree) {
duke@1:         if (tree.getTag() == JCTree.SELECT) {
duke@1:             Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
duke@1:             if (lsym == null || lsym.kind != TYP) {
duke@1:                 return false;
duke@1:             }
duke@1:         }
duke@1:         return true;
duke@1:     }
duke@1: 
duke@1:     /** Is this symbol a type?
duke@1:      */
duke@1:     static boolean isType(Symbol sym) {
duke@1:         return sym != null && sym.kind == TYP;
duke@1:     }
duke@1: 
duke@1:     /** The current `this' symbol.
duke@1:      *  @param env    The current environment.
duke@1:      */
duke@1:     Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
duke@1:         return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
duke@1:     }
duke@1: 
duke@1:     /** Attribute a parsed identifier.
duke@1:      * @param tree Parsed identifier name
duke@1:      * @param topLevel The toplevel to use
duke@1:      */
duke@1:     public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
duke@1:         Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
duke@1:         localEnv.enclClass = make.ClassDef(make.Modifiers(0),
duke@1:                                            syms.errSymbol.name,
duke@1:                                            null, null, null, null);
duke@1:         localEnv.enclClass.sym = syms.errSymbol;
duke@1:         return tree.accept(identAttributer, localEnv);
duke@1:     }
duke@1:     // where
duke@1:         private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
duke@1:         private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
duke@1:             @Override
duke@1:             public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
duke@1:                 Symbol site = visit(node.getExpression(), env);
duke@1:                 if (site.kind == ERR)
duke@1:                     return site;
duke@1:                 Name name = (Name)node.getIdentifier();
duke@1:                 if (site.kind == PCK) {
duke@1:                     env.toplevel.packge = (PackageSymbol)site;
duke@1:                     return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
duke@1:                 } else {
duke@1:                     env.enclClass.sym = (ClassSymbol)site;
duke@1:                     return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             @Override
duke@1:             public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
duke@1:                 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
duke@1:             }
duke@1:         }
duke@1: 
duke@1:     public Type coerce(Type etype, Type ttype) {
duke@1:         return cfolder.coerce(etype, ttype);
duke@1:     }
duke@1: 
duke@1:     public Type attribType(JCTree node, TypeSymbol sym) {
duke@1:         Env<AttrContext> env = enter.typeEnvs.get(sym);
duke@1:         Env<AttrContext> localEnv = env.dup(node, env.info.dup());
duke@1:         return attribTree(node, localEnv, Kinds.TYP, Type.noType);
duke@1:     }
duke@1: 
duke@1:     public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
duke@1:         breakTree = tree;
duke@1:         JavaFileObject prev = log.useSource(null);
duke@1:         try {
duke@1:             attribExpr(expr, env);
duke@1:         } catch (BreakAttr b) {
duke@1:             return b.env;
duke@1:         } finally {
duke@1:             breakTree = null;
duke@1:             log.useSource(prev);
duke@1:         }
duke@1:         return env;
duke@1:     }
duke@1: 
duke@1:     public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
duke@1:         breakTree = tree;
duke@1:         JavaFileObject prev = log.useSource(null);
duke@1:         try {
duke@1:             attribStat(stmt, env);
duke@1:         } catch (BreakAttr b) {
duke@1:             return b.env;
duke@1:         } finally {
duke@1:             breakTree = null;
duke@1:             log.useSource(prev);
duke@1:         }
duke@1:         return env;
duke@1:     }
duke@1: 
duke@1:     private JCTree breakTree = null;
duke@1: 
duke@1:     private static class BreakAttr extends RuntimeException {
duke@1:         static final long serialVersionUID = -6924771130405446405L;
duke@1:         private Env<AttrContext> env;
duke@1:         private BreakAttr(Env<AttrContext> env) {
duke@1:             this.env = env;
duke@1:         }
duke@1:     }
duke@1: 
duke@1: 
duke@1: /* ************************************************************************
duke@1:  * Visitor methods
duke@1:  *************************************************************************/
duke@1: 
duke@1:     /** Visitor argument: the current environment.
duke@1:      */
duke@1:     Env<AttrContext> env;
duke@1: 
duke@1:     /** Visitor argument: the currently expected proto-kind.
duke@1:      */
duke@1:     int pkind;
duke@1: 
duke@1:     /** Visitor argument: the currently expected proto-type.
duke@1:      */
duke@1:     Type pt;
duke@1: 
duke@1:     /** Visitor result: the computed type.
duke@1:      */
duke@1:     Type result;
duke@1: 
duke@1:     /** Visitor method: attribute a tree, catching any completion failure
duke@1:      *  exceptions. Return the tree's type.
duke@1:      *
duke@1:      *  @param tree    The tree to be visited.
duke@1:      *  @param env     The environment visitor argument.
duke@1:      *  @param pkind   The protokind visitor argument.
duke@1:      *  @param pt      The prototype visitor argument.
duke@1:      */
duke@1:     Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt) {
duke@1:         Env<AttrContext> prevEnv = this.env;
duke@1:         int prevPkind = this.pkind;
duke@1:         Type prevPt = this.pt;
duke@1:         try {
duke@1:             this.env = env;
duke@1:             this.pkind = pkind;
duke@1:             this.pt = pt;
duke@1:             tree.accept(this);
duke@1:             if (tree == breakTree)
duke@1:                 throw new BreakAttr(env);
duke@1:             return result;
duke@1:         } catch (CompletionFailure ex) {
duke@1:             tree.type = syms.errType;
duke@1:             return chk.completionError(tree.pos(), ex);
duke@1:         } finally {
duke@1:             this.env = prevEnv;
duke@1:             this.pkind = prevPkind;
duke@1:             this.pt = prevPt;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Derived visitor method: attribute an expression tree.
duke@1:      */
duke@1:     public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
duke@1:         return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType);
duke@1:     }
duke@1: 
duke@1:     /** Derived visitor method: attribute an expression tree with
duke@1:      *  no constraints on the computed type.
duke@1:      */
duke@1:     Type attribExpr(JCTree tree, Env<AttrContext> env) {
duke@1:         return attribTree(tree, env, VAL, Type.noType);
duke@1:     }
duke@1: 
duke@1:     /** Derived visitor method: attribute a type tree.
duke@1:      */
duke@1:     Type attribType(JCTree tree, Env<AttrContext> env) {
duke@1:         Type result = attribTree(tree, env, TYP, Type.noType);
duke@1:         return result;
duke@1:     }
duke@1: 
duke@1:     /** Derived visitor method: attribute a statement or definition tree.
duke@1:      */
duke@1:     public Type attribStat(JCTree tree, Env<AttrContext> env) {
duke@1:         return attribTree(tree, env, NIL, Type.noType);
duke@1:     }
duke@1: 
duke@1:     /** Attribute a list of expressions, returning a list of types.
duke@1:      */
duke@1:     List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
duke@1:         ListBuffer<Type> ts = new ListBuffer<Type>();
duke@1:         for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
duke@1:             ts.append(attribExpr(l.head, env, pt));
duke@1:         return ts.toList();
duke@1:     }
duke@1: 
duke@1:     /** Attribute a list of statements, returning nothing.
duke@1:      */
duke@1:     <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
duke@1:         for (List<T> l = trees; l.nonEmpty(); l = l.tail)
duke@1:             attribStat(l.head, env);
duke@1:     }
duke@1: 
duke@1:     /** Attribute the arguments in a method call, returning a list of types.
duke@1:      */
duke@1:     List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
duke@1:         ListBuffer<Type> argtypes = new ListBuffer<Type>();
duke@1:         for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
duke@1:             argtypes.append(chk.checkNonVoid(
duke@1:                 l.head.pos(), types.upperBound(attribTree(l.head, env, VAL, Infer.anyPoly))));
duke@1:         return argtypes.toList();
duke@1:     }
duke@1: 
duke@1:     /** Attribute a type argument list, returning a list of types.
duke@1:      */
duke@1:     List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
duke@1:         ListBuffer<Type> argtypes = new ListBuffer<Type>();
duke@1:         for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
duke@1:             argtypes.append(chk.checkRefType(l.head.pos(), attribType(l.head, env)));
duke@1:         return argtypes.toList();
duke@1:     }
duke@1: 
duke@1: 
duke@1:     /**
duke@1:      * Attribute type variables (of generic classes or methods).
duke@1:      * Compound types are attributed later in attribBounds.
duke@1:      * @param typarams the type variables to enter
duke@1:      * @param env      the current environment
duke@1:      */
duke@1:     void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
duke@1:         for (JCTypeParameter tvar : typarams) {
duke@1:             TypeVar a = (TypeVar)tvar.type;
mcimadamore@42:             a.tsym.flags_field |= UNATTRIBUTED;
mcimadamore@42:             a.bound = Type.noType;
duke@1:             if (!tvar.bounds.isEmpty()) {
duke@1:                 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
duke@1:                 for (JCExpression bound : tvar.bounds.tail)
duke@1:                     bounds = bounds.prepend(attribType(bound, env));
duke@1:                 types.setBounds(a, bounds.reverse());
duke@1:             } else {
duke@1:                 // if no bounds are given, assume a single bound of
duke@1:                 // java.lang.Object.
duke@1:                 types.setBounds(a, List.of(syms.objectType));
duke@1:             }
mcimadamore@42:             a.tsym.flags_field &= ~UNATTRIBUTED;
duke@1:         }
duke@1:         for (JCTypeParameter tvar : typarams)
duke@1:             chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
duke@1:         attribStats(typarams, env);
mcimadamore@42:     }
mcimadamore@42: 
mcimadamore@42:     void attribBounds(List<JCTypeParameter> typarams) {
duke@1:         for (JCTypeParameter typaram : typarams) {
duke@1:             Type bound = typaram.type.getUpperBound();
duke@1:             if (bound != null && bound.tsym instanceof ClassSymbol) {
duke@1:                 ClassSymbol c = (ClassSymbol)bound.tsym;
duke@1:                 if ((c.flags_field & COMPOUND) != 0) {
duke@1:                     assert (c.flags_field & UNATTRIBUTED) != 0 : c;
duke@1:                     attribClass(typaram.pos(), c);
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Attribute the type references in a list of annotations.
duke@1:      */
duke@1:     void attribAnnotationTypes(List<JCAnnotation> annotations,
duke@1:                                Env<AttrContext> env) {
duke@1:         for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
duke@1:             JCAnnotation a = al.head;
duke@1:             attribType(a.annotationType, env);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Attribute type reference in an `extends' or `implements' clause.
duke@1:      *
duke@1:      *  @param tree              The tree making up the type reference.
duke@1:      *  @param env               The environment current at the reference.
duke@1:      *  @param classExpected     true if only a class is expected here.
duke@1:      *  @param interfaceExpected true if only an interface is expected here.
duke@1:      */
duke@1:     Type attribBase(JCTree tree,
duke@1:                     Env<AttrContext> env,
duke@1:                     boolean classExpected,
duke@1:                     boolean interfaceExpected,
duke@1:                     boolean checkExtensible) {
duke@1:         Type t = attribType(tree, env);
duke@1:         return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
duke@1:     }
duke@1:     Type checkBase(Type t,
duke@1:                    JCTree tree,
duke@1:                    Env<AttrContext> env,
duke@1:                    boolean classExpected,
duke@1:                    boolean interfaceExpected,
duke@1:                    boolean checkExtensible) {
duke@1:         if (t.tag == TYPEVAR && !classExpected && !interfaceExpected) {
duke@1:             // check that type variable is already visible
duke@1:             if (t.getUpperBound() == null) {
duke@1:                 log.error(tree.pos(), "illegal.forward.ref");
jjg@110:                 return types.createErrorType(t);
duke@1:             }
duke@1:         } else {
duke@1:             t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
duke@1:         }
duke@1:         if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
duke@1:             log.error(tree.pos(), "intf.expected.here");
duke@1:             // return errType is necessary since otherwise there might
duke@1:             // be undetected cycles which cause attribution to loop
jjg@110:             return types.createErrorType(t);
duke@1:         } else if (checkExtensible &&
duke@1:                    classExpected &&
duke@1:                    (t.tsym.flags() & INTERFACE) != 0) {
duke@1:             log.error(tree.pos(), "no.intf.expected.here");
jjg@110:             return types.createErrorType(t);
duke@1:         }
duke@1:         if (checkExtensible &&
duke@1:             ((t.tsym.flags() & FINAL) != 0)) {
duke@1:             log.error(tree.pos(),
duke@1:                       "cant.inherit.from.final", t.tsym);
duke@1:         }
duke@1:         chk.checkNonCyclic(tree.pos(), t);
duke@1:         return t;
duke@1:     }
duke@1: 
duke@1:     public void visitClassDef(JCClassDecl tree) {
duke@1:         // Local classes have not been entered yet, so we need to do it now:
duke@1:         if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
duke@1:             enter.classEnter(tree, env);
duke@1: 
duke@1:         ClassSymbol c = tree.sym;
duke@1:         if (c == null) {
duke@1:             // exit in case something drastic went wrong during enter.
duke@1:             result = null;
duke@1:         } else {
duke@1:             // make sure class has been completed:
duke@1:             c.complete();
duke@1: 
duke@1:             // If this class appears as an anonymous class
duke@1:             // in a superclass constructor call where
duke@1:             // no explicit outer instance is given,
duke@1:             // disable implicit outer instance from being passed.
duke@1:             // (This would be an illegal access to "this before super").
duke@1:             if (env.info.isSelfCall &&
duke@1:                 env.tree.getTag() == JCTree.NEWCLASS &&
duke@1:                 ((JCNewClass) env.tree).encl == null)
duke@1:             {
duke@1:                 c.flags_field |= NOOUTERTHIS;
duke@1:             }
duke@1:             attribClass(tree.pos(), c);
duke@1:             result = tree.type = c.type;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void visitMethodDef(JCMethodDecl tree) {
duke@1:         MethodSymbol m = tree.sym;
duke@1: 
duke@1:         Lint lint = env.info.lint.augment(m.attributes_field, m.flags());
duke@1:         Lint prevLint = chk.setLint(lint);
duke@1:         try {
duke@1:             chk.checkDeprecatedAnnotation(tree.pos(), m);
duke@1: 
mcimadamore@42:             attribBounds(tree.typarams);
duke@1: 
duke@1:             // If we override any other methods, check that we do so properly.
duke@1:             // JLS ???
duke@1:             chk.checkOverride(tree, m);
duke@1: 
duke@1:             // Create a new environment with local scope
duke@1:             // for attributing the method.
duke@1:             Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
duke@1: 
duke@1:             localEnv.info.lint = lint;
duke@1: 
duke@1:             // Enter all type parameters into the local method scope.
duke@1:             for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
duke@1:                 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
duke@1: 
duke@1:             ClassSymbol owner = env.enclClass.sym;
duke@1:             if ((owner.flags() & ANNOTATION) != 0 &&
duke@1:                 tree.params.nonEmpty())
duke@1:                 log.error(tree.params.head.pos(),
duke@1:                           "intf.annotation.members.cant.have.params");
duke@1: 
duke@1:             // Attribute all value parameters.
duke@1:             for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
duke@1:                 attribStat(l.head, localEnv);
duke@1:             }
duke@1: 
duke@1:             // Check that type parameters are well-formed.
mcimadamore@122:             chk.validate(tree.typarams, localEnv);
duke@1:             if ((owner.flags() & ANNOTATION) != 0 &&
duke@1:                 tree.typarams.nonEmpty())
duke@1:                 log.error(tree.typarams.head.pos(),
duke@1:                           "intf.annotation.members.cant.have.type.params");
duke@1: 
duke@1:             // Check that result type is well-formed.
mcimadamore@122:             chk.validate(tree.restype, localEnv);
duke@1:             if ((owner.flags() & ANNOTATION) != 0)
duke@1:                 chk.validateAnnotationType(tree.restype);
duke@1: 
duke@1:             if ((owner.flags() & ANNOTATION) != 0)
duke@1:                 chk.validateAnnotationMethod(tree.pos(), m);
duke@1: 
duke@1:             // Check that all exceptions mentioned in the throws clause extend
duke@1:             // java.lang.Throwable.
duke@1:             if ((owner.flags() & ANNOTATION) != 0 && tree.thrown.nonEmpty())
duke@1:                 log.error(tree.thrown.head.pos(),
duke@1:                           "throws.not.allowed.in.intf.annotation");
duke@1:             for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
duke@1:                 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
duke@1: 
duke@1:             if (tree.body == null) {
duke@1:                 // Empty bodies are only allowed for
duke@1:                 // abstract, native, or interface methods, or for methods
duke@1:                 // in a retrofit signature class.
duke@1:                 if ((owner.flags() & INTERFACE) == 0 &&
duke@1:                     (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 &&
duke@1:                     !relax)
duke@1:                     log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
duke@1:                 if (tree.defaultValue != null) {
duke@1:                     if ((owner.flags() & ANNOTATION) == 0)
duke@1:                         log.error(tree.pos(),
duke@1:                                   "default.allowed.in.intf.annotation.member");
duke@1:                 }
duke@1:             } else if ((owner.flags() & INTERFACE) != 0) {
duke@1:                 log.error(tree.body.pos(), "intf.meth.cant.have.body");
duke@1:             } else if ((tree.mods.flags & ABSTRACT) != 0) {
duke@1:                 log.error(tree.pos(), "abstract.meth.cant.have.body");
duke@1:             } else if ((tree.mods.flags & NATIVE) != 0) {
duke@1:                 log.error(tree.pos(), "native.meth.cant.have.body");
duke@1:             } else {
duke@1:                 // Add an implicit super() call unless an explicit call to
duke@1:                 // super(...) or this(...) is given
duke@1:                 // or we are compiling class java.lang.Object.
duke@1:                 if (tree.name == names.init && owner.type != syms.objectType) {
duke@1:                     JCBlock body = tree.body;
duke@1:                     if (body.stats.isEmpty() ||
duke@1:                         !TreeInfo.isSelfCall(body.stats.head)) {
duke@1:                         body.stats = body.stats.
duke@1:                             prepend(memberEnter.SuperCall(make.at(body.pos),
duke@1:                                                           List.<Type>nil(),
duke@1:                                                           List.<JCVariableDecl>nil(),
duke@1:                                                           false));
duke@1:                     } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
duke@1:                                (tree.mods.flags & GENERATEDCONSTR) == 0 &&
duke@1:                                TreeInfo.isSuperCall(body.stats.head)) {
duke@1:                         // enum constructors are not allowed to call super
duke@1:                         // directly, so make sure there aren't any super calls
duke@1:                         // in enum constructors, except in the compiler
duke@1:                         // generated one.
duke@1:                         log.error(tree.body.stats.head.pos(),
duke@1:                                   "call.to.super.not.allowed.in.enum.ctor",
duke@1:                                   env.enclClass.sym);
duke@1:                     }
duke@1:                 }
duke@1: 
duke@1:                 // Attribute method body.
duke@1:                 attribStat(tree.body, localEnv);
duke@1:             }
duke@1:             localEnv.info.scope.leave();
duke@1:             result = tree.type = m.type;
duke@1:             chk.validateAnnotations(tree.mods.annotations, m);
duke@1: 
duke@1:         }
duke@1:         finally {
duke@1:             chk.setLint(prevLint);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void visitVarDef(JCVariableDecl tree) {
duke@1:         // Local variables have not been entered yet, so we need to do it now:
duke@1:         if (env.info.scope.owner.kind == MTH) {
duke@1:             if (tree.sym != null) {
duke@1:                 // parameters have already been entered
duke@1:                 env.info.scope.enter(tree.sym);
duke@1:             } else {
duke@1:                 memberEnter.memberEnter(tree, env);
duke@1:                 annotate.flush();
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         VarSymbol v = tree.sym;
duke@1:         Lint lint = env.info.lint.augment(v.attributes_field, v.flags());
duke@1:         Lint prevLint = chk.setLint(lint);
duke@1: 
mcimadamore@165:         // Check that the variable's declared type is well-formed.
mcimadamore@165:         chk.validate(tree.vartype, env);
mcimadamore@165: 
duke@1:         try {
duke@1:             chk.checkDeprecatedAnnotation(tree.pos(), v);
duke@1: 
duke@1:             if (tree.init != null) {
duke@1:                 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
duke@1:                     // In this case, `v' is final.  Ensure that it's initializer is
duke@1:                     // evaluated.
duke@1:                     v.getConstValue(); // ensure initializer is evaluated
duke@1:                 } else {
duke@1:                     // Attribute initializer in a new environment
duke@1:                     // with the declared variable as owner.
duke@1:                     // Check that initializer conforms to variable's declared type.
duke@1:                     Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
duke@1:                     initEnv.info.lint = lint;
duke@1:                     // In order to catch self-references, we set the variable's
duke@1:                     // declaration position to maximal possible value, effectively
duke@1:                     // marking the variable as undefined.
mcimadamore@94:                     initEnv.info.enclVar = v;
duke@1:                     attribExpr(tree.init, initEnv, v.type);
duke@1:                 }
duke@1:             }
duke@1:             result = tree.type = v.type;
duke@1:             chk.validateAnnotations(tree.mods.annotations, v);
duke@1:         }
duke@1:         finally {
duke@1:             chk.setLint(prevLint);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void visitSkip(JCSkip tree) {
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitBlock(JCBlock tree) {
duke@1:         if (env.info.scope.owner.kind == TYP) {
duke@1:             // Block is a static or instance initializer;
duke@1:             // let the owner of the environment be a freshly
duke@1:             // created BLOCK-method.
duke@1:             Env<AttrContext> localEnv =
duke@1:                 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
duke@1:             localEnv.info.scope.owner =
duke@1:                 new MethodSymbol(tree.flags | BLOCK, names.empty, null,
duke@1:                                  env.info.scope.owner);
duke@1:             if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
duke@1:             attribStats(tree.stats, localEnv);
duke@1:         } else {
duke@1:             // Create a new local environment with a local scope.
duke@1:             Env<AttrContext> localEnv =
duke@1:                 env.dup(tree, env.info.dup(env.info.scope.dup()));
duke@1:             attribStats(tree.stats, localEnv);
duke@1:             localEnv.info.scope.leave();
duke@1:         }
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitDoLoop(JCDoWhileLoop tree) {
duke@1:         attribStat(tree.body, env.dup(tree));
duke@1:         attribExpr(tree.cond, env, syms.booleanType);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitWhileLoop(JCWhileLoop tree) {
duke@1:         attribExpr(tree.cond, env, syms.booleanType);
duke@1:         attribStat(tree.body, env.dup(tree));
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitForLoop(JCForLoop tree) {
duke@1:         Env<AttrContext> loopEnv =
duke@1:             env.dup(env.tree, env.info.dup(env.info.scope.dup()));
duke@1:         attribStats(tree.init, loopEnv);
duke@1:         if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
duke@1:         loopEnv.tree = tree; // before, we were not in loop!
duke@1:         attribStats(tree.step, loopEnv);
duke@1:         attribStat(tree.body, loopEnv);
duke@1:         loopEnv.info.scope.leave();
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitForeachLoop(JCEnhancedForLoop tree) {
duke@1:         Env<AttrContext> loopEnv =
duke@1:             env.dup(env.tree, env.info.dup(env.info.scope.dup()));
duke@1:         attribStat(tree.var, loopEnv);
duke@1:         Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
duke@1:         chk.checkNonVoid(tree.pos(), exprType);
duke@1:         Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
duke@1:         if (elemtype == null) {
duke@1:             // or perhaps expr implements Iterable<T>?
duke@1:             Type base = types.asSuper(exprType, syms.iterableType.tsym);
duke@1:             if (base == null) {
duke@1:                 log.error(tree.expr.pos(), "foreach.not.applicable.to.type");
jjg@110:                 elemtype = types.createErrorType(exprType);
duke@1:             } else {
duke@1:                 List<Type> iterableParams = base.allparams();
duke@1:                 elemtype = iterableParams.isEmpty()
duke@1:                     ? syms.objectType
duke@1:                     : types.upperBound(iterableParams.head);
duke@1:             }
duke@1:         }
duke@1:         chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
duke@1:         loopEnv.tree = tree; // before, we were not in loop!
duke@1:         attribStat(tree.body, loopEnv);
duke@1:         loopEnv.info.scope.leave();
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitLabelled(JCLabeledStatement tree) {
duke@1:         // Check that label is not used in an enclosing statement
duke@1:         Env<AttrContext> env1 = env;
duke@1:         while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) {
duke@1:             if (env1.tree.getTag() == JCTree.LABELLED &&
duke@1:                 ((JCLabeledStatement) env1.tree).label == tree.label) {
duke@1:                 log.error(tree.pos(), "label.already.in.use",
duke@1:                           tree.label);
duke@1:                 break;
duke@1:             }
duke@1:             env1 = env1.next;
duke@1:         }
duke@1: 
duke@1:         attribStat(tree.body, env.dup(tree));
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitSwitch(JCSwitch tree) {
duke@1:         Type seltype = attribExpr(tree.selector, env);
duke@1: 
duke@1:         Env<AttrContext> switchEnv =
duke@1:             env.dup(tree, env.info.dup(env.info.scope.dup()));
duke@1: 
duke@1:         boolean enumSwitch =
duke@1:             allowEnums &&
duke@1:             (seltype.tsym.flags() & Flags.ENUM) != 0;
duke@1:         if (!enumSwitch)
duke@1:             seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
duke@1: 
duke@1:         // Attribute all cases and
duke@1:         // check that there are no duplicate case labels or default clauses.
duke@1:         Set<Object> labels = new HashSet<Object>(); // The set of case labels.
duke@1:         boolean hasDefault = false;      // Is there a default label?
duke@1:         for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
duke@1:             JCCase c = l.head;
duke@1:             Env<AttrContext> caseEnv =
duke@1:                 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
duke@1:             if (c.pat != null) {
duke@1:                 if (enumSwitch) {
duke@1:                     Symbol sym = enumConstant(c.pat, seltype);
duke@1:                     if (sym == null) {
duke@1:                         log.error(c.pat.pos(), "enum.const.req");
duke@1:                     } else if (!labels.add(sym)) {
duke@1:                         log.error(c.pos(), "duplicate.case.label");
duke@1:                     }
duke@1:                 } else {
duke@1:                     Type pattype = attribExpr(c.pat, switchEnv, seltype);
duke@1:                     if (pattype.tag != ERROR) {
duke@1:                         if (pattype.constValue() == null) {
duke@1:                             log.error(c.pat.pos(), "const.expr.req");
duke@1:                         } else if (labels.contains(pattype.constValue())) {
duke@1:                             log.error(c.pos(), "duplicate.case.label");
duke@1:                         } else {
duke@1:                             labels.add(pattype.constValue());
duke@1:                         }
duke@1:                     }
duke@1:                 }
duke@1:             } else if (hasDefault) {
duke@1:                 log.error(c.pos(), "duplicate.default.label");
duke@1:             } else {
duke@1:                 hasDefault = true;
duke@1:             }
duke@1:             attribStats(c.stats, caseEnv);
duke@1:             caseEnv.info.scope.leave();
duke@1:             addVars(c.stats, switchEnv.info.scope);
duke@1:         }
duke@1: 
duke@1:         switchEnv.info.scope.leave();
duke@1:         result = null;
duke@1:     }
duke@1:     // where
duke@1:         /** Add any variables defined in stats to the switch scope. */
duke@1:         private static void addVars(List<JCStatement> stats, Scope switchScope) {
duke@1:             for (;stats.nonEmpty(); stats = stats.tail) {
duke@1:                 JCTree stat = stats.head;
duke@1:                 if (stat.getTag() == JCTree.VARDEF)
duke@1:                     switchScope.enter(((JCVariableDecl) stat).sym);
duke@1:             }
duke@1:         }
duke@1:     // where
duke@1:     /** Return the selected enumeration constant symbol, or null. */
duke@1:     private Symbol enumConstant(JCTree tree, Type enumType) {
duke@1:         if (tree.getTag() != JCTree.IDENT) {
duke@1:             log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
duke@1:             return syms.errSymbol;
duke@1:         }
duke@1:         JCIdent ident = (JCIdent)tree;
duke@1:         Name name = ident.name;
duke@1:         for (Scope.Entry e = enumType.tsym.members().lookup(name);
duke@1:              e.scope != null; e = e.next()) {
duke@1:             if (e.sym.kind == VAR) {
duke@1:                 Symbol s = ident.sym = e.sym;
duke@1:                 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
duke@1:                 ident.type = s.type;
duke@1:                 return ((s.flags_field & Flags.ENUM) == 0)
duke@1:                     ? null : s;
duke@1:             }
duke@1:         }
duke@1:         return null;
duke@1:     }
duke@1: 
duke@1:     public void visitSynchronized(JCSynchronized tree) {
duke@1:         chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
duke@1:         attribStat(tree.body, env);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitTry(JCTry tree) {
duke@1:         // Attribute body
duke@1:         attribStat(tree.body, env.dup(tree, env.info.dup()));
duke@1: 
duke@1:         // Attribute catch clauses
duke@1:         for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
duke@1:             JCCatch c = l.head;
duke@1:             Env<AttrContext> catchEnv =
duke@1:                 env.dup(c, env.info.dup(env.info.scope.dup()));
duke@1:             Type ctype = attribStat(c.param, catchEnv);
duke@1:             if (c.param.type.tsym.kind == Kinds.VAR) {
duke@1:                 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
duke@1:             }
duke@1:             chk.checkType(c.param.vartype.pos(),
duke@1:                           chk.checkClassType(c.param.vartype.pos(), ctype),
duke@1:                           syms.throwableType);
duke@1:             attribStat(c.body, catchEnv);
duke@1:             catchEnv.info.scope.leave();
duke@1:         }
duke@1: 
duke@1:         // Attribute finalizer
duke@1:         if (tree.finalizer != null) attribStat(tree.finalizer, env);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitConditional(JCConditional tree) {
duke@1:         attribExpr(tree.cond, env, syms.booleanType);
duke@1:         attribExpr(tree.truepart, env);
duke@1:         attribExpr(tree.falsepart, env);
duke@1:         result = check(tree,
duke@1:                        capture(condType(tree.pos(), tree.cond.type,
duke@1:                                         tree.truepart.type, tree.falsepart.type)),
duke@1:                        VAL, pkind, pt);
duke@1:     }
duke@1:     //where
duke@1:         /** Compute the type of a conditional expression, after
duke@1:          *  checking that it exists. See Spec 15.25.
duke@1:          *
duke@1:          *  @param pos      The source position to be used for
duke@1:          *                  error diagnostics.
duke@1:          *  @param condtype The type of the expression's condition.
duke@1:          *  @param thentype The type of the expression's then-part.
duke@1:          *  @param elsetype The type of the expression's else-part.
duke@1:          */
duke@1:         private Type condType(DiagnosticPosition pos,
duke@1:                               Type condtype,
duke@1:                               Type thentype,
duke@1:                               Type elsetype) {
duke@1:             Type ctype = condType1(pos, condtype, thentype, elsetype);
duke@1: 
duke@1:             // If condition and both arms are numeric constants,
duke@1:             // evaluate at compile-time.
duke@1:             return ((condtype.constValue() != null) &&
duke@1:                     (thentype.constValue() != null) &&
duke@1:                     (elsetype.constValue() != null))
duke@1:                 ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype)
duke@1:                 : ctype;
duke@1:         }
duke@1:         /** Compute the type of a conditional expression, after
duke@1:          *  checking that it exists.  Does not take into
duke@1:          *  account the special case where condition and both arms
duke@1:          *  are constants.
duke@1:          *
duke@1:          *  @param pos      The source position to be used for error
duke@1:          *                  diagnostics.
duke@1:          *  @param condtype The type of the expression's condition.
duke@1:          *  @param thentype The type of the expression's then-part.
duke@1:          *  @param elsetype The type of the expression's else-part.
duke@1:          */
duke@1:         private Type condType1(DiagnosticPosition pos, Type condtype,
duke@1:                                Type thentype, Type elsetype) {
duke@1:             // If same type, that is the result
duke@1:             if (types.isSameType(thentype, elsetype))
duke@1:                 return thentype.baseType();
duke@1: 
duke@1:             Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
duke@1:                 ? thentype : types.unboxedType(thentype);
duke@1:             Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
duke@1:                 ? elsetype : types.unboxedType(elsetype);
duke@1: 
duke@1:             // Otherwise, if both arms can be converted to a numeric
duke@1:             // type, return the least numeric type that fits both arms
duke@1:             // (i.e. return larger of the two, or return int if one
duke@1:             // arm is short, the other is char).
duke@1:             if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
duke@1:                 // If one arm has an integer subrange type (i.e., byte,
duke@1:                 // short, or char), and the other is an integer constant
duke@1:                 // that fits into the subrange, return the subrange type.
duke@1:                 if (thenUnboxed.tag < INT && elseUnboxed.tag == INT &&
duke@1:                     types.isAssignable(elseUnboxed, thenUnboxed))
duke@1:                     return thenUnboxed.baseType();
duke@1:                 if (elseUnboxed.tag < INT && thenUnboxed.tag == INT &&
duke@1:                     types.isAssignable(thenUnboxed, elseUnboxed))
duke@1:                     return elseUnboxed.baseType();
duke@1: 
duke@1:                 for (int i = BYTE; i < VOID; i++) {
duke@1:                     Type candidate = syms.typeOfTag[i];
duke@1:                     if (types.isSubtype(thenUnboxed, candidate) &&
duke@1:                         types.isSubtype(elseUnboxed, candidate))
duke@1:                         return candidate;
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             // Those were all the cases that could result in a primitive
duke@1:             if (allowBoxing) {
duke@1:                 if (thentype.isPrimitive())
duke@1:                     thentype = types.boxedClass(thentype).type;
duke@1:                 if (elsetype.isPrimitive())
duke@1:                     elsetype = types.boxedClass(elsetype).type;
duke@1:             }
duke@1: 
duke@1:             if (types.isSubtype(thentype, elsetype))
duke@1:                 return elsetype.baseType();
duke@1:             if (types.isSubtype(elsetype, thentype))
duke@1:                 return thentype.baseType();
duke@1: 
duke@1:             if (!allowBoxing || thentype.tag == VOID || elsetype.tag == VOID) {
duke@1:                 log.error(pos, "neither.conditional.subtype",
duke@1:                           thentype, elsetype);
duke@1:                 return thentype.baseType();
duke@1:             }
duke@1: 
duke@1:             // both are known to be reference types.  The result is
duke@1:             // lub(thentype,elsetype). This cannot fail, as it will
duke@1:             // always be possible to infer "Object" if nothing better.
duke@1:             return types.lub(thentype.baseType(), elsetype.baseType());
duke@1:         }
duke@1: 
duke@1:     public void visitIf(JCIf tree) {
duke@1:         attribExpr(tree.cond, env, syms.booleanType);
duke@1:         attribStat(tree.thenpart, env);
duke@1:         if (tree.elsepart != null)
duke@1:             attribStat(tree.elsepart, env);
duke@1:         chk.checkEmptyIf(tree);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitExec(JCExpressionStatement tree) {
duke@1:         attribExpr(tree.expr, env);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitBreak(JCBreak tree) {
duke@1:         tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitContinue(JCContinue tree) {
duke@1:         tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
duke@1:         result = null;
duke@1:     }
duke@1:     //where
duke@1:         /** Return the target of a break or continue statement, if it exists,
duke@1:          *  report an error if not.
duke@1:          *  Note: The target of a labelled break or continue is the
duke@1:          *  (non-labelled) statement tree referred to by the label,
duke@1:          *  not the tree representing the labelled statement itself.
duke@1:          *
duke@1:          *  @param pos     The position to be used for error diagnostics
duke@1:          *  @param tag     The tag of the jump statement. This is either
duke@1:          *                 Tree.BREAK or Tree.CONTINUE.
duke@1:          *  @param label   The label of the jump statement, or null if no
duke@1:          *                 label is given.
duke@1:          *  @param env     The environment current at the jump statement.
duke@1:          */
duke@1:         private JCTree findJumpTarget(DiagnosticPosition pos,
duke@1:                                     int tag,
duke@1:                                     Name label,
duke@1:                                     Env<AttrContext> env) {
duke@1:             // Search environments outwards from the point of jump.
duke@1:             Env<AttrContext> env1 = env;
duke@1:             LOOP:
duke@1:             while (env1 != null) {
duke@1:                 switch (env1.tree.getTag()) {
duke@1:                 case JCTree.LABELLED:
duke@1:                     JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
duke@1:                     if (label == labelled.label) {
duke@1:                         // If jump is a continue, check that target is a loop.
duke@1:                         if (tag == JCTree.CONTINUE) {
duke@1:                             if (labelled.body.getTag() != JCTree.DOLOOP &&
duke@1:                                 labelled.body.getTag() != JCTree.WHILELOOP &&
duke@1:                                 labelled.body.getTag() != JCTree.FORLOOP &&
duke@1:                                 labelled.body.getTag() != JCTree.FOREACHLOOP)
duke@1:                                 log.error(pos, "not.loop.label", label);
duke@1:                             // Found labelled statement target, now go inwards
duke@1:                             // to next non-labelled tree.
duke@1:                             return TreeInfo.referencedStatement(labelled);
duke@1:                         } else {
duke@1:                             return labelled;
duke@1:                         }
duke@1:                     }
duke@1:                     break;
duke@1:                 case JCTree.DOLOOP:
duke@1:                 case JCTree.WHILELOOP:
duke@1:                 case JCTree.FORLOOP:
duke@1:                 case JCTree.FOREACHLOOP:
duke@1:                     if (label == null) return env1.tree;
duke@1:                     break;
duke@1:                 case JCTree.SWITCH:
duke@1:                     if (label == null && tag == JCTree.BREAK) return env1.tree;
duke@1:                     break;
duke@1:                 case JCTree.METHODDEF:
duke@1:                 case JCTree.CLASSDEF:
duke@1:                     break LOOP;
duke@1:                 default:
duke@1:                 }
duke@1:                 env1 = env1.next;
duke@1:             }
duke@1:             if (label != null)
duke@1:                 log.error(pos, "undef.label", label);
duke@1:             else if (tag == JCTree.CONTINUE)
duke@1:                 log.error(pos, "cont.outside.loop");
duke@1:             else
duke@1:                 log.error(pos, "break.outside.switch.loop");
duke@1:             return null;
duke@1:         }
duke@1: 
duke@1:     public void visitReturn(JCReturn tree) {
duke@1:         // Check that there is an enclosing method which is
duke@1:         // nested within than the enclosing class.
duke@1:         if (env.enclMethod == null ||
duke@1:             env.enclMethod.sym.owner != env.enclClass.sym) {
duke@1:             log.error(tree.pos(), "ret.outside.meth");
duke@1: 
duke@1:         } else {
duke@1:             // Attribute return expression, if it exists, and check that
duke@1:             // it conforms to result type of enclosing method.
duke@1:             Symbol m = env.enclMethod.sym;
duke@1:             if (m.type.getReturnType().tag == VOID) {
duke@1:                 if (tree.expr != null)
duke@1:                     log.error(tree.expr.pos(),
duke@1:                               "cant.ret.val.from.meth.decl.void");
duke@1:             } else if (tree.expr == null) {
duke@1:                 log.error(tree.pos(), "missing.ret.val");
duke@1:             } else {
duke@1:                 attribExpr(tree.expr, env, m.type.getReturnType());
duke@1:             }
duke@1:         }
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitThrow(JCThrow tree) {
duke@1:         attribExpr(tree.expr, env, syms.throwableType);
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:     public void visitAssert(JCAssert tree) {
duke@1:         attribExpr(tree.cond, env, syms.booleanType);
duke@1:         if (tree.detail != null) {
duke@1:             chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
duke@1:         }
duke@1:         result = null;
duke@1:     }
duke@1: 
duke@1:      /** Visitor method for method invocations.
duke@1:      *  NOTE: The method part of an application will have in its type field
duke@1:      *        the return type of the method, not the method's type itself!
duke@1:      */
duke@1:     public void visitApply(JCMethodInvocation tree) {
duke@1:         // The local environment of a method application is
duke@1:         // a new environment nested in the current one.
duke@1:         Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
duke@1: 
duke@1:         // The types of the actual method arguments.
duke@1:         List<Type> argtypes;
duke@1: 
duke@1:         // The types of the actual method type arguments.
duke@1:         List<Type> typeargtypes = null;
duke@1: 
duke@1:         Name methName = TreeInfo.name(tree.meth);
duke@1: 
duke@1:         boolean isConstructorCall =
duke@1:             methName == names._this || methName == names._super;
duke@1: 
duke@1:         if (isConstructorCall) {
duke@1:             // We are seeing a ...this(...) or ...super(...) call.
duke@1:             // Check that this is the first statement in a constructor.
duke@1:             if (checkFirstConstructorStat(tree, env)) {
duke@1: 
duke@1:                 // Record the fact
duke@1:                 // that this is a constructor call (using isSelfCall).
duke@1:                 localEnv.info.isSelfCall = true;
duke@1: 
duke@1:                 // Attribute arguments, yielding list of argument types.
duke@1:                 argtypes = attribArgs(tree.args, localEnv);
duke@1:                 typeargtypes = attribTypes(tree.typeargs, localEnv);
duke@1: 
duke@1:                 // Variable `site' points to the class in which the called
duke@1:                 // constructor is defined.
duke@1:                 Type site = env.enclClass.sym.type;
duke@1:                 if (methName == names._super) {
duke@1:                     if (site == syms.objectType) {
duke@1:                         log.error(tree.meth.pos(), "no.superclass", site);
jjg@110:                         site = types.createErrorType(syms.objectType);
duke@1:                     } else {
duke@1:                         site = types.supertype(site);
duke@1:                     }
duke@1:                 }
duke@1: 
duke@1:                 if (site.tag == CLASS) {
duke@1:                     if (site.getEnclosingType().tag == CLASS) {
duke@1:                         // we are calling a nested class
duke@1: 
duke@1:                         if (tree.meth.getTag() == JCTree.SELECT) {
duke@1:                             JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
duke@1: 
duke@1:                             // We are seeing a prefixed call, of the form
duke@1:                             //     <expr>.super(...).
duke@1:                             // Check that the prefix expression conforms
duke@1:                             // to the outer instance type of the class.
duke@1:                             chk.checkRefType(qualifier.pos(),
duke@1:                                              attribExpr(qualifier, localEnv,
duke@1:                                                         site.getEnclosingType()));
duke@1:                         } else if (methName == names._super) {
duke@1:                             // qualifier omitted; check for existence
duke@1:                             // of an appropriate implicit qualifier.
duke@1:                             rs.resolveImplicitThis(tree.meth.pos(),
duke@1:                                                    localEnv, site);
duke@1:                         }
duke@1:                     } else if (tree.meth.getTag() == JCTree.SELECT) {
duke@1:                         log.error(tree.meth.pos(), "illegal.qual.not.icls",
duke@1:                                   site.tsym);
duke@1:                     }
duke@1: 
duke@1:                     // if we're calling a java.lang.Enum constructor,
duke@1:                     // prefix the implicit String and int parameters
duke@1:                     if (site.tsym == syms.enumSym && allowEnums)
duke@1:                         argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
duke@1: 
duke@1:                     // Resolve the called constructor under the assumption
duke@1:                     // that we are referring to a superclass instance of the
duke@1:                     // current instance (JLS ???).
duke@1:                     boolean selectSuperPrev = localEnv.info.selectSuper;
duke@1:                     localEnv.info.selectSuper = true;
duke@1:                     localEnv.info.varArgs = false;
duke@1:                     Symbol sym = rs.resolveConstructor(
duke@1:                         tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
duke@1:                     localEnv.info.selectSuper = selectSuperPrev;
duke@1: 
duke@1:                     // Set method symbol to resolved constructor...
duke@1:                     TreeInfo.setSymbol(tree.meth, sym);
duke@1: 
duke@1:                     // ...and check that it is legal in the current context.
duke@1:                     // (this will also set the tree's type)
duke@1:                     Type mpt = newMethTemplate(argtypes, typeargtypes);
duke@1:                     checkId(tree.meth, site, sym, localEnv, MTH,
duke@1:                             mpt, tree.varargsElement != null);
duke@1:                 }
duke@1:                 // Otherwise, `site' is an error type and we do nothing
duke@1:             }
duke@1:             result = tree.type = syms.voidType;
duke@1:         } else {
duke@1:             // Otherwise, we are seeing a regular method call.
duke@1:             // Attribute the arguments, yielding list of argument types, ...
duke@1:             argtypes = attribArgs(tree.args, localEnv);
duke@1:             typeargtypes = attribTypes(tree.typeargs, localEnv);
duke@1: 
duke@1:             // ... and attribute the method using as a prototype a methodtype
duke@1:             // whose formal argument types is exactly the list of actual
duke@1:             // arguments (this will also set the method symbol).
duke@1:             Type mpt = newMethTemplate(argtypes, typeargtypes);
duke@1:             localEnv.info.varArgs = false;
duke@1:             Type mtype = attribExpr(tree.meth, localEnv, mpt);
duke@1:             if (localEnv.info.varArgs)
duke@1:                 assert mtype.isErroneous() || tree.varargsElement != null;
duke@1: 
duke@1:             // Compute the result type.
duke@1:             Type restype = mtype.getReturnType();
duke@1:             assert restype.tag != WILDCARD : mtype;
duke@1: 
duke@1:             // as a special case, array.clone() has a result that is
duke@1:             // the same as static type of the array being cloned
duke@1:             if (tree.meth.getTag() == JCTree.SELECT &&
duke@1:                 allowCovariantReturns &&
duke@1:                 methName == names.clone &&
duke@1:                 types.isArray(((JCFieldAccess) tree.meth).selected.type))
duke@1:                 restype = ((JCFieldAccess) tree.meth).selected.type;
duke@1: 
duke@1:             // as a special case, x.getClass() has type Class<? extends |X|>
duke@1:             if (allowGenerics &&
duke@1:                 methName == names.getClass && tree.args.isEmpty()) {
duke@1:                 Type qualifier = (tree.meth.getTag() == JCTree.SELECT)
duke@1:                     ? ((JCFieldAccess) tree.meth).selected.type
duke@1:                     : env.enclClass.sym.type;
duke@1:                 restype = new
duke@1:                     ClassType(restype.getEnclosingType(),
duke@1:                               List.<Type>of(new WildcardType(types.erasure(qualifier),
duke@1:                                                                BoundKind.EXTENDS,
duke@1:                                                                syms.boundClass)),
duke@1:                               restype.tsym);
duke@1:             }
duke@1: 
duke@1:             // Check that value of resulting type is admissible in the
duke@1:             // current context.  Also, capture the return type
duke@1:             result = check(tree, capture(restype), VAL, pkind, pt);
duke@1:         }
mcimadamore@122:         chk.validate(tree.typeargs, localEnv);
duke@1:     }
duke@1:     //where
duke@1:         /** Check that given application node appears as first statement
duke@1:          *  in a constructor call.
duke@1:          *  @param tree   The application node
duke@1:          *  @param env    The environment current at the application.
duke@1:          */
duke@1:         boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
duke@1:             JCMethodDecl enclMethod = env.enclMethod;
duke@1:             if (enclMethod != null && enclMethod.name == names.init) {
duke@1:                 JCBlock body = enclMethod.body;
duke@1:                 if (body.stats.head.getTag() == JCTree.EXEC &&
duke@1:                     ((JCExpressionStatement) body.stats.head).expr == tree)
duke@1:                     return true;
duke@1:             }
duke@1:             log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
duke@1:                       TreeInfo.name(tree.meth));
duke@1:             return false;
duke@1:         }
duke@1: 
duke@1:         /** Obtain a method type with given argument types.
duke@1:          */
duke@1:         Type newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) {
duke@1:             MethodType mt = new MethodType(argtypes, null, null, syms.methodClass);
duke@1:             return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
duke@1:         }
duke@1: 
duke@1:     public void visitNewClass(JCNewClass tree) {
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1: 
duke@1:         // The local environment of a class creation is
duke@1:         // a new environment nested in the current one.
duke@1:         Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
duke@1: 
duke@1:         // The anonymous inner class definition of the new expression,
duke@1:         // if one is defined by it.
duke@1:         JCClassDecl cdef = tree.def;
duke@1: 
duke@1:         // If enclosing class is given, attribute it, and
duke@1:         // complete class name to be fully qualified
duke@1:         JCExpression clazz = tree.clazz; // Class field following new
duke@1:         JCExpression clazzid =          // Identifier in class field
duke@1:             (clazz.getTag() == JCTree.TYPEAPPLY)
duke@1:             ? ((JCTypeApply) clazz).clazz
duke@1:             : clazz;
duke@1: 
duke@1:         JCExpression clazzid1 = clazzid; // The same in fully qualified form
duke@1: 
duke@1:         if (tree.encl != null) {
duke@1:             // We are seeing a qualified new, of the form
duke@1:             //    <expr>.new C <...> (...) ...
duke@1:             // In this case, we let clazz stand for the name of the
duke@1:             // allocated class C prefixed with the type of the qualifier
duke@1:             // expression, so that we can
duke@1:             // resolve it with standard techniques later. I.e., if
duke@1:             // <expr> has type T, then <expr>.new C <...> (...)
duke@1:             // yields a clazz T.C.
duke@1:             Type encltype = chk.checkRefType(tree.encl.pos(),
duke@1:                                              attribExpr(tree.encl, env));
duke@1:             clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
duke@1:                                                  ((JCIdent) clazzid).name);
duke@1:             if (clazz.getTag() == JCTree.TYPEAPPLY)
duke@1:                 clazz = make.at(tree.pos).
duke@1:                     TypeApply(clazzid1,
duke@1:                               ((JCTypeApply) clazz).arguments);
duke@1:             else
duke@1:                 clazz = clazzid1;
duke@1: //          System.out.println(clazz + " generated.");//DEBUG
duke@1:         }
duke@1: 
duke@1:         // Attribute clazz expression and store
duke@1:         // symbol + type back into the attributed tree.
duke@1:         Type clazztype = chk.checkClassType(
duke@1:             tree.clazz.pos(), attribType(clazz, env), true);
mcimadamore@122:         chk.validate(clazz, localEnv);
duke@1:         if (tree.encl != null) {
duke@1:             // We have to work in this case to store
duke@1:             // symbol + type back into the attributed tree.
duke@1:             tree.clazz.type = clazztype;
duke@1:             TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
duke@1:             clazzid.type = ((JCIdent) clazzid).sym.type;
duke@1:             if (!clazztype.isErroneous()) {
duke@1:                 if (cdef != null && clazztype.tsym.isInterface()) {
duke@1:                     log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
duke@1:                 } else if (clazztype.tsym.isStatic()) {
duke@1:                     log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
duke@1:                 }
duke@1:             }
duke@1:         } else if (!clazztype.tsym.isInterface() &&
duke@1:                    clazztype.getEnclosingType().tag == CLASS) {
duke@1:             // Check for the existence of an apropos outer instance
duke@1:             rs.resolveImplicitThis(tree.pos(), env, clazztype);
duke@1:         }
duke@1: 
duke@1:         // Attribute constructor arguments.
duke@1:         List<Type> argtypes = attribArgs(tree.args, localEnv);
duke@1:         List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
duke@1: 
duke@1:         // If we have made no mistakes in the class type...
duke@1:         if (clazztype.tag == CLASS) {
duke@1:             // Enums may not be instantiated except implicitly
duke@1:             if (allowEnums &&
duke@1:                 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
duke@1:                 (env.tree.getTag() != JCTree.VARDEF ||
duke@1:                  (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
duke@1:                  ((JCVariableDecl) env.tree).init != tree))
duke@1:                 log.error(tree.pos(), "enum.cant.be.instantiated");
duke@1:             // Check that class is not abstract
duke@1:             if (cdef == null &&
duke@1:                 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
duke@1:                 log.error(tree.pos(), "abstract.cant.be.instantiated",
duke@1:                           clazztype.tsym);
duke@1:             } else if (cdef != null && clazztype.tsym.isInterface()) {
duke@1:                 // Check that no constructor arguments are given to
duke@1:                 // anonymous classes implementing an interface
duke@1:                 if (!argtypes.isEmpty())
duke@1:                     log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
duke@1: 
duke@1:                 if (!typeargtypes.isEmpty())
duke@1:                     log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
duke@1: 
duke@1:                 // Error recovery: pretend no arguments were supplied.
duke@1:                 argtypes = List.nil();
duke@1:                 typeargtypes = List.nil();
duke@1:             }
duke@1: 
duke@1:             // Resolve the called constructor under the assumption
duke@1:             // that we are referring to a superclass instance of the
duke@1:             // current instance (JLS ???).
duke@1:             else {
duke@1:                 localEnv.info.selectSuper = cdef != null;
duke@1:                 localEnv.info.varArgs = false;
duke@1:                 tree.constructor = rs.resolveConstructor(
duke@1:                     tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
duke@1:                 Type ctorType = checkMethod(clazztype,
duke@1:                                             tree.constructor,
duke@1:                                             localEnv,
duke@1:                                             tree.args,
duke@1:                                             argtypes,
duke@1:                                             typeargtypes,
duke@1:                                             localEnv.info.varArgs);
duke@1:                 if (localEnv.info.varArgs)
duke@1:                     assert ctorType.isErroneous() || tree.varargsElement != null;
duke@1:             }
duke@1: 
duke@1:             if (cdef != null) {
duke@1:                 // We are seeing an anonymous class instance creation.
duke@1:                 // In this case, the class instance creation
duke@1:                 // expression
duke@1:                 //
duke@1:                 //    E.new <typeargs1>C<typargs2>(args) { ... }
duke@1:                 //
duke@1:                 // is represented internally as
duke@1:                 //
duke@1:                 //    E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } )  .
duke@1:                 //
duke@1:                 // This expression is then *transformed* as follows:
duke@1:                 //
duke@1:                 // (1) add a STATIC flag to the class definition
duke@1:                 //     if the current environment is static
duke@1:                 // (2) add an extends or implements clause
duke@1:                 // (3) add a constructor.
duke@1:                 //
duke@1:                 // For instance, if C is a class, and ET is the type of E,
duke@1:                 // the expression
duke@1:                 //
duke@1:                 //    E.new <typeargs1>C<typargs2>(args) { ... }
duke@1:                 //
duke@1:                 // is translated to (where X is a fresh name and typarams is the
duke@1:                 // parameter list of the super constructor):
duke@1:                 //
duke@1:                 //   new <typeargs1>X(<*nullchk*>E, args) where
duke@1:                 //     X extends C<typargs2> {
duke@1:                 //       <typarams> X(ET e, args) {
duke@1:                 //         e.<typeargs1>super(args)
duke@1:                 //       }
duke@1:                 //       ...
duke@1:                 //     }
duke@1:                 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
duke@1: 
duke@1:                 if (clazztype.tsym.isInterface()) {
duke@1:                     cdef.implementing = List.of(clazz);
duke@1:                 } else {
duke@1:                     cdef.extending = clazz;
duke@1:                 }
duke@1: 
duke@1:                 attribStat(cdef, localEnv);
duke@1: 
duke@1:                 // If an outer instance is given,
duke@1:                 // prefix it to the constructor arguments
duke@1:                 // and delete it from the new expression
duke@1:                 if (tree.encl != null && !clazztype.tsym.isInterface()) {
duke@1:                     tree.args = tree.args.prepend(makeNullCheck(tree.encl));
duke@1:                     argtypes = argtypes.prepend(tree.encl.type);
duke@1:                     tree.encl = null;
duke@1:                 }
duke@1: 
duke@1:                 // Reassign clazztype and recompute constructor.
duke@1:                 clazztype = cdef.sym.type;
duke@1:                 Symbol sym = rs.resolveConstructor(
duke@1:                     tree.pos(), localEnv, clazztype, argtypes,
duke@1:                     typeargtypes, true, tree.varargsElement != null);
duke@1:                 assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous();
duke@1:                 tree.constructor = sym;
duke@1:             }
duke@1: 
duke@1:             if (tree.constructor != null && tree.constructor.kind == MTH)
duke@1:                 owntype = clazztype;
duke@1:         }
duke@1:         result = check(tree, owntype, VAL, pkind, pt);
mcimadamore@122:         chk.validate(tree.typeargs, localEnv);
duke@1:     }
duke@1: 
duke@1:     /** Make an attributed null check tree.
duke@1:      */
duke@1:     public JCExpression makeNullCheck(JCExpression arg) {
duke@1:         // optimization: X.this is never null; skip null check
duke@1:         Name name = TreeInfo.name(arg);
duke@1:         if (name == names._this || name == names._super) return arg;
duke@1: 
duke@1:         int optag = JCTree.NULLCHK;
duke@1:         JCUnary tree = make.at(arg.pos).Unary(optag, arg);
duke@1:         tree.operator = syms.nullcheck;
duke@1:         tree.type = arg.type;
duke@1:         return tree;
duke@1:     }
duke@1: 
duke@1:     public void visitNewArray(JCNewArray tree) {
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1:         Type elemtype;
duke@1:         if (tree.elemtype != null) {
duke@1:             elemtype = attribType(tree.elemtype, env);
mcimadamore@122:             chk.validate(tree.elemtype, env);
duke@1:             owntype = elemtype;
duke@1:             for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
duke@1:                 attribExpr(l.head, env, syms.intType);
duke@1:                 owntype = new ArrayType(owntype, syms.arrayClass);
duke@1:             }
duke@1:         } else {
duke@1:             // we are seeing an untyped aggregate { ... }
duke@1:             // this is allowed only if the prototype is an array
duke@1:             if (pt.tag == ARRAY) {
duke@1:                 elemtype = types.elemtype(pt);
duke@1:             } else {
duke@1:                 if (pt.tag != ERROR) {
duke@1:                     log.error(tree.pos(), "illegal.initializer.for.type",
duke@1:                               pt);
duke@1:                 }
jjg@110:                 elemtype = types.createErrorType(pt);
duke@1:             }
duke@1:         }
duke@1:         if (tree.elems != null) {
duke@1:             attribExprs(tree.elems, env, elemtype);
duke@1:             owntype = new ArrayType(elemtype, syms.arrayClass);
duke@1:         }
duke@1:         if (!types.isReifiable(elemtype))
duke@1:             log.error(tree.pos(), "generic.array.creation");
duke@1:         result = check(tree, owntype, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitParens(JCParens tree) {
duke@1:         Type owntype = attribTree(tree.expr, env, pkind, pt);
duke@1:         result = check(tree, owntype, pkind, pkind, pt);
duke@1:         Symbol sym = TreeInfo.symbol(tree);
duke@1:         if (sym != null && (sym.kind&(TYP|PCK)) != 0)
duke@1:             log.error(tree.pos(), "illegal.start.of.type");
duke@1:     }
duke@1: 
duke@1:     public void visitAssign(JCAssign tree) {
duke@1:         Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType);
duke@1:         Type capturedType = capture(owntype);
duke@1:         attribExpr(tree.rhs, env, owntype);
duke@1:         result = check(tree, capturedType, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitAssignop(JCAssignOp tree) {
duke@1:         // Attribute arguments.
duke@1:         Type owntype = attribTree(tree.lhs, env, VAR, Type.noType);
duke@1:         Type operand = attribExpr(tree.rhs, env);
duke@1:         // Find operator.
duke@1:         Symbol operator = tree.operator = rs.resolveBinaryOperator(
duke@1:             tree.pos(), tree.getTag() - JCTree.ASGOffset, env,
duke@1:             owntype, operand);
duke@1: 
duke@1:         if (operator.kind == MTH) {
duke@1:             chk.checkOperator(tree.pos(),
duke@1:                               (OperatorSymbol)operator,
duke@1:                               tree.getTag() - JCTree.ASGOffset,
duke@1:                               owntype,
duke@1:                               operand);
jjg@9:             chk.checkDivZero(tree.rhs.pos(), operator, operand);
jjg@9:             chk.checkCastable(tree.rhs.pos(),
jjg@9:                               operator.type.getReturnType(),
jjg@9:                               owntype);
duke@1:         }
duke@1:         result = check(tree, owntype, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitUnary(JCUnary tree) {
duke@1:         // Attribute arguments.
duke@1:         Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
duke@1:             ? attribTree(tree.arg, env, VAR, Type.noType)
duke@1:             : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
duke@1: 
duke@1:         // Find operator.
duke@1:         Symbol operator = tree.operator =
duke@1:             rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
duke@1: 
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1:         if (operator.kind == MTH) {
duke@1:             owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
duke@1:                 ? tree.arg.type
duke@1:                 : operator.type.getReturnType();
duke@1:             int opc = ((OperatorSymbol)operator).opcode;
duke@1: 
duke@1:             // If the argument is constant, fold it.
duke@1:             if (argtype.constValue() != null) {
duke@1:                 Type ctype = cfolder.fold1(opc, argtype);
duke@1:                 if (ctype != null) {
duke@1:                     owntype = cfolder.coerce(ctype, owntype);
duke@1: 
duke@1:                     // Remove constant types from arguments to
duke@1:                     // conserve space. The parser will fold concatenations
duke@1:                     // of string literals; the code here also
duke@1:                     // gets rid of intermediate results when some of the
duke@1:                     // operands are constant identifiers.
duke@1:                     if (tree.arg.type.tsym == syms.stringType.tsym) {
duke@1:                         tree.arg.type = syms.stringType;
duke@1:                     }
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1:         result = check(tree, owntype, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitBinary(JCBinary tree) {
duke@1:         // Attribute arguments.
duke@1:         Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
duke@1:         Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
duke@1: 
duke@1:         // Find operator.
duke@1:         Symbol operator = tree.operator =
duke@1:             rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
duke@1: 
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1:         if (operator.kind == MTH) {
duke@1:             owntype = operator.type.getReturnType();
duke@1:             int opc = chk.checkOperator(tree.lhs.pos(),
duke@1:                                         (OperatorSymbol)operator,
duke@1:                                         tree.getTag(),
duke@1:                                         left,
duke@1:                                         right);
duke@1: 
duke@1:             // If both arguments are constants, fold them.
duke@1:             if (left.constValue() != null && right.constValue() != null) {
duke@1:                 Type ctype = cfolder.fold2(opc, left, right);
duke@1:                 if (ctype != null) {
duke@1:                     owntype = cfolder.coerce(ctype, owntype);
duke@1: 
duke@1:                     // Remove constant types from arguments to
duke@1:                     // conserve space. The parser will fold concatenations
duke@1:                     // of string literals; the code here also
duke@1:                     // gets rid of intermediate results when some of the
duke@1:                     // operands are constant identifiers.
duke@1:                     if (tree.lhs.type.tsym == syms.stringType.tsym) {
duke@1:                         tree.lhs.type = syms.stringType;
duke@1:                     }
duke@1:                     if (tree.rhs.type.tsym == syms.stringType.tsym) {
duke@1:                         tree.rhs.type = syms.stringType;
duke@1:                     }
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             // Check that argument types of a reference ==, != are
duke@1:             // castable to each other, (JLS???).
duke@1:             if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
duke@1:                 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
duke@1:                     log.error(tree.pos(), "incomparable.types", left, right);
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             chk.checkDivZero(tree.rhs.pos(), operator, right);
duke@1:         }
duke@1:         result = check(tree, owntype, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitTypeCast(JCTypeCast tree) {
duke@1:         Type clazztype = attribType(tree.clazz, env);
mcimadamore@122:         chk.validate(tree.clazz, env);
duke@1:         Type exprtype = attribExpr(tree.expr, env, Infer.anyPoly);
duke@1:         Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
duke@1:         if (exprtype.constValue() != null)
duke@1:             owntype = cfolder.coerce(exprtype, owntype);
duke@1:         result = check(tree, capture(owntype), VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitTypeTest(JCInstanceOf tree) {
duke@1:         Type exprtype = chk.checkNullOrRefType(
duke@1:             tree.expr.pos(), attribExpr(tree.expr, env));
duke@1:         Type clazztype = chk.checkReifiableReferenceType(
duke@1:             tree.clazz.pos(), attribType(tree.clazz, env));
mcimadamore@122:         chk.validate(tree.clazz, env);
duke@1:         chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
duke@1:         result = check(tree, syms.booleanType, VAL, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitIndexed(JCArrayAccess tree) {
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1:         Type atype = attribExpr(tree.indexed, env);
duke@1:         attribExpr(tree.index, env, syms.intType);
duke@1:         if (types.isArray(atype))
duke@1:             owntype = types.elemtype(atype);
duke@1:         else if (atype.tag != ERROR)
duke@1:             log.error(tree.pos(), "array.req.but.found", atype);
duke@1:         if ((pkind & VAR) == 0) owntype = capture(owntype);
duke@1:         result = check(tree, owntype, VAR, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitIdent(JCIdent tree) {
duke@1:         Symbol sym;
duke@1:         boolean varArgs = false;
duke@1: 
duke@1:         // Find symbol
duke@1:         if (pt.tag == METHOD || pt.tag == FORALL) {
duke@1:             // If we are looking for a method, the prototype `pt' will be a
duke@1:             // method type with the type of the call's arguments as parameters.
duke@1:             env.info.varArgs = false;
duke@1:             sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments());
duke@1:             varArgs = env.info.varArgs;
duke@1:         } else if (tree.sym != null && tree.sym.kind != VAR) {
duke@1:             sym = tree.sym;
duke@1:         } else {
duke@1:             sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind);
duke@1:         }
duke@1:         tree.sym = sym;
duke@1: 
duke@1:         // (1) Also find the environment current for the class where
duke@1:         //     sym is defined (`symEnv').
duke@1:         // Only for pre-tiger versions (1.4 and earlier):
duke@1:         // (2) Also determine whether we access symbol out of an anonymous
duke@1:         //     class in a this or super call.  This is illegal for instance
duke@1:         //     members since such classes don't carry a this$n link.
duke@1:         //     (`noOuterThisPath').
duke@1:         Env<AttrContext> symEnv = env;
duke@1:         boolean noOuterThisPath = false;
duke@1:         if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
duke@1:             (sym.kind & (VAR | MTH | TYP)) != 0 &&
duke@1:             sym.owner.kind == TYP &&
duke@1:             tree.name != names._this && tree.name != names._super) {
duke@1: 
duke@1:             // Find environment in which identifier is defined.
duke@1:             while (symEnv.outer != null &&
duke@1:                    !sym.isMemberOf(symEnv.enclClass.sym, types)) {
duke@1:                 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
duke@1:                     noOuterThisPath = !allowAnonOuterThis;
duke@1:                 symEnv = symEnv.outer;
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         // If symbol is a variable, ...
duke@1:         if (sym.kind == VAR) {
duke@1:             VarSymbol v = (VarSymbol)sym;
duke@1: 
duke@1:             // ..., evaluate its initializer, if it has one, and check for
duke@1:             // illegal forward reference.
duke@1:             checkInit(tree, env, v, false);
duke@1: 
duke@1:             // If symbol is a local variable accessed from an embedded
duke@1:             // inner class check that it is final.
duke@1:             if (v.owner.kind == MTH &&
duke@1:                 v.owner != env.info.scope.owner &&
duke@1:                 (v.flags_field & FINAL) == 0) {
duke@1:                 log.error(tree.pos(),
duke@1:                           "local.var.accessed.from.icls.needs.final",
duke@1:                           v);
duke@1:             }
duke@1: 
duke@1:             // If we are expecting a variable (as opposed to a value), check
duke@1:             // that the variable is assignable in the current environment.
duke@1:             if (pkind == VAR)
duke@1:                 checkAssignable(tree.pos(), v, null, env);
duke@1:         }
duke@1: 
duke@1:         // In a constructor body,
duke@1:         // if symbol is a field or instance method, check that it is
duke@1:         // not accessed before the supertype constructor is called.
duke@1:         if ((symEnv.info.isSelfCall || noOuterThisPath) &&
duke@1:             (sym.kind & (VAR | MTH)) != 0 &&
duke@1:             sym.owner.kind == TYP &&
duke@1:             (sym.flags() & STATIC) == 0) {
duke@1:             chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
duke@1:         }
duke@1:         Env<AttrContext> env1 = env;
mcimadamore@28:         if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
duke@1:             // If the found symbol is inaccessible, then it is
duke@1:             // accessed through an enclosing instance.  Locate this
duke@1:             // enclosing instance:
duke@1:             while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
duke@1:                 env1 = env1.outer;
duke@1:         }
duke@1:         result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs);
duke@1:     }
duke@1: 
duke@1:     public void visitSelect(JCFieldAccess tree) {
duke@1:         // Determine the expected kind of the qualifier expression.
duke@1:         int skind = 0;
duke@1:         if (tree.name == names._this || tree.name == names._super ||
duke@1:             tree.name == names._class)
duke@1:         {
duke@1:             skind = TYP;
duke@1:         } else {
duke@1:             if ((pkind & PCK) != 0) skind = skind | PCK;
duke@1:             if ((pkind & TYP) != 0) skind = skind | TYP | PCK;
duke@1:             if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
duke@1:         }
duke@1: 
duke@1:         // Attribute the qualifier expression, and determine its symbol (if any).
duke@1:         Type site = attribTree(tree.selected, env, skind, Infer.anyPoly);
duke@1:         if ((pkind & (PCK | TYP)) == 0)
duke@1:             site = capture(site); // Capture field access
duke@1: 
duke@1:         // don't allow T.class T[].class, etc
duke@1:         if (skind == TYP) {
duke@1:             Type elt = site;
duke@1:             while (elt.tag == ARRAY)
duke@1:                 elt = ((ArrayType)elt).elemtype;
duke@1:             if (elt.tag == TYPEVAR) {
duke@1:                 log.error(tree.pos(), "type.var.cant.be.deref");
jjg@110:                 result = types.createErrorType(tree.type);
duke@1:                 return;
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         // If qualifier symbol is a type or `super', assert `selectSuper'
duke@1:         // for the selection. This is relevant for determining whether
duke@1:         // protected symbols are accessible.
duke@1:         Symbol sitesym = TreeInfo.symbol(tree.selected);
duke@1:         boolean selectSuperPrev = env.info.selectSuper;
duke@1:         env.info.selectSuper =
duke@1:             sitesym != null &&
duke@1:             sitesym.name == names._super;
duke@1: 
duke@1:         // If selected expression is polymorphic, strip
duke@1:         // type parameters and remember in env.info.tvars, so that
duke@1:         // they can be added later (in Attr.checkId and Infer.instantiateMethod).
duke@1:         if (tree.selected.type.tag == FORALL) {
duke@1:             ForAll pstype = (ForAll)tree.selected.type;
duke@1:             env.info.tvars = pstype.tvars;
duke@1:             site = tree.selected.type = pstype.qtype;
duke@1:         }
duke@1: 
duke@1:         // Determine the symbol represented by the selection.
duke@1:         env.info.varArgs = false;
duke@1:         Symbol sym = selectSym(tree, site, env, pt, pkind);
duke@1:         if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) {
duke@1:             site = capture(site);
duke@1:             sym = selectSym(tree, site, env, pt, pkind);
duke@1:         }
duke@1:         boolean varArgs = env.info.varArgs;
duke@1:         tree.sym = sym;
duke@1: 
mcimadamore@27:         if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) {
mcimadamore@27:             while (site.tag == TYPEVAR) site = site.getUpperBound();
mcimadamore@27:             site = capture(site);
mcimadamore@27:         }
duke@1: 
duke@1:         // If that symbol is a variable, ...
duke@1:         if (sym.kind == VAR) {
duke@1:             VarSymbol v = (VarSymbol)sym;
duke@1: 
duke@1:             // ..., evaluate its initializer, if it has one, and check for
duke@1:             // illegal forward reference.
duke@1:             checkInit(tree, env, v, true);
duke@1: 
duke@1:             // If we are expecting a variable (as opposed to a value), check
duke@1:             // that the variable is assignable in the current environment.
duke@1:             if (pkind == VAR)
duke@1:                 checkAssignable(tree.pos(), v, tree.selected, env);
duke@1:         }
duke@1: 
duke@1:         // Disallow selecting a type from an expression
duke@1:         if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
duke@1:             tree.type = check(tree.selected, pt,
duke@1:                               sitesym == null ? VAL : sitesym.kind, TYP|PCK, pt);
duke@1:         }
duke@1: 
duke@1:         if (isType(sitesym)) {
duke@1:             if (sym.name == names._this) {
duke@1:                 // If `C' is the currently compiled class, check that
duke@1:                 // C.this' does not appear in a call to a super(...)
duke@1:                 if (env.info.isSelfCall &&
duke@1:                     site.tsym == env.enclClass.sym) {
duke@1:                     chk.earlyRefError(tree.pos(), sym);
duke@1:                 }
duke@1:             } else {
duke@1:                 // Check if type-qualified fields or methods are static (JLS)
duke@1:                 if ((sym.flags() & STATIC) == 0 &&
duke@1:                     sym.name != names._super &&
duke@1:                     (sym.kind == VAR || sym.kind == MTH)) {
duke@1:                     rs.access(rs.new StaticError(sym),
duke@1:                               tree.pos(), site, sym.name, true);
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         // If we are selecting an instance member via a `super', ...
duke@1:         if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
duke@1: 
duke@1:             // Check that super-qualified symbols are not abstract (JLS)
duke@1:             rs.checkNonAbstract(tree.pos(), sym);
duke@1: 
duke@1:             if (site.isRaw()) {
duke@1:                 // Determine argument types for site.
duke@1:                 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
duke@1:                 if (site1 != null) site = site1;
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         env.info.selectSuper = selectSuperPrev;
duke@1:         result = checkId(tree, site, sym, env, pkind, pt, varArgs);
duke@1:         env.info.tvars = List.nil();
duke@1:     }
duke@1:     //where
duke@1:         /** Determine symbol referenced by a Select expression,
duke@1:          *
duke@1:          *  @param tree   The select tree.
duke@1:          *  @param site   The type of the selected expression,
duke@1:          *  @param env    The current environment.
duke@1:          *  @param pt     The current prototype.
duke@1:          *  @param pkind  The expected kind(s) of the Select expression.
duke@1:          */
duke@1:         private Symbol selectSym(JCFieldAccess tree,
duke@1:                                  Type site,
duke@1:                                  Env<AttrContext> env,
duke@1:                                  Type pt,
duke@1:                                  int pkind) {
duke@1:             DiagnosticPosition pos = tree.pos();
duke@1:             Name name = tree.name;
duke@1: 
duke@1:             switch (site.tag) {
duke@1:             case PACKAGE:
duke@1:                 return rs.access(
duke@1:                     rs.findIdentInPackage(env, site.tsym, name, pkind),
duke@1:                     pos, site, name, true);
duke@1:             case ARRAY:
duke@1:             case CLASS:
duke@1:                 if (pt.tag == METHOD || pt.tag == FORALL) {
duke@1:                     return rs.resolveQualifiedMethod(
duke@1:                         pos, env, site, name, pt.getParameterTypes(), pt.getTypeArguments());
duke@1:                 } else if (name == names._this || name == names._super) {
duke@1:                     return rs.resolveSelf(pos, env, site.tsym, name);
duke@1:                 } else if (name == names._class) {
duke@1:                     // In this case, we have already made sure in
duke@1:                     // visitSelect that qualifier expression is a type.
duke@1:                     Type t = syms.classType;
duke@1:                     List<Type> typeargs = allowGenerics
duke@1:                         ? List.of(types.erasure(site))
duke@1:                         : List.<Type>nil();
duke@1:                     t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
duke@1:                     return new VarSymbol(
duke@1:                         STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
duke@1:                 } else {
duke@1:                     // We are seeing a plain identifier as selector.
duke@1:                     Symbol sym = rs.findIdentInType(env, site, name, pkind);
duke@1:                     if ((pkind & ERRONEOUS) == 0)
duke@1:                         sym = rs.access(sym, pos, site, name, true);
duke@1:                     return sym;
duke@1:                 }
duke@1:             case WILDCARD:
duke@1:                 throw new AssertionError(tree);
duke@1:             case TYPEVAR:
duke@1:                 // Normally, site.getUpperBound() shouldn't be null.
duke@1:                 // It should only happen during memberEnter/attribBase
duke@1:                 // when determining the super type which *must* be
duke@1:                 // done before attributing the type variables.  In
duke@1:                 // other words, we are seeing this illegal program:
duke@1:                 // class B<T> extends A<T.foo> {}
duke@1:                 Symbol sym = (site.getUpperBound() != null)
duke@1:                     ? selectSym(tree, capture(site.getUpperBound()), env, pt, pkind)
duke@1:                     : null;
duke@1:                 if (sym == null || isType(sym)) {
duke@1:                     log.error(pos, "type.var.cant.be.deref");
duke@1:                     return syms.errSymbol;
duke@1:                 } else {
mcimadamore@155:                     Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
mcimadamore@155:                         rs.new AccessError(env, site, sym) :
mcimadamore@155:                                 sym;
mcimadamore@155:                     rs.access(sym2, pos, site, name, true);
duke@1:                     return sym;
duke@1:                 }
duke@1:             case ERROR:
duke@1:                 // preserve identifier names through errors
jjg@110:                 return types.createErrorType(name, site.tsym, site).tsym;
duke@1:             default:
duke@1:                 // The qualifier expression is of a primitive type -- only
duke@1:                 // .class is allowed for these.
duke@1:                 if (name == names._class) {
duke@1:                     // In this case, we have already made sure in Select that
duke@1:                     // qualifier expression is a type.
duke@1:                     Type t = syms.classType;
duke@1:                     Type arg = types.boxedClass(site).type;
duke@1:                     t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
duke@1:                     return new VarSymbol(
duke@1:                         STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
duke@1:                 } else {
duke@1:                     log.error(pos, "cant.deref", site);
duke@1:                     return syms.errSymbol;
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         /** Determine type of identifier or select expression and check that
duke@1:          *  (1) the referenced symbol is not deprecated
duke@1:          *  (2) the symbol's type is safe (@see checkSafe)
duke@1:          *  (3) if symbol is a variable, check that its type and kind are
duke@1:          *      compatible with the prototype and protokind.
duke@1:          *  (4) if symbol is an instance field of a raw type,
duke@1:          *      which is being assigned to, issue an unchecked warning if its
duke@1:          *      type changes under erasure.
duke@1:          *  (5) if symbol is an instance method of a raw type, issue an
duke@1:          *      unchecked warning if its argument types change under erasure.
duke@1:          *  If checks succeed:
duke@1:          *    If symbol is a constant, return its constant type
duke@1:          *    else if symbol is a method, return its result type
duke@1:          *    otherwise return its type.
duke@1:          *  Otherwise return errType.
duke@1:          *
duke@1:          *  @param tree       The syntax tree representing the identifier
duke@1:          *  @param site       If this is a select, the type of the selected
duke@1:          *                    expression, otherwise the type of the current class.
duke@1:          *  @param sym        The symbol representing the identifier.
duke@1:          *  @param env        The current environment.
duke@1:          *  @param pkind      The set of expected kinds.
duke@1:          *  @param pt         The expected type.
duke@1:          */
duke@1:         Type checkId(JCTree tree,
duke@1:                      Type site,
duke@1:                      Symbol sym,
duke@1:                      Env<AttrContext> env,
duke@1:                      int pkind,
duke@1:                      Type pt,
duke@1:                      boolean useVarargs) {
jjg@110:             if (pt.isErroneous()) return types.createErrorType(site);
duke@1:             Type owntype; // The computed type of this identifier occurrence.
duke@1:             switch (sym.kind) {
duke@1:             case TYP:
duke@1:                 // For types, the computed type equals the symbol's type,
duke@1:                 // except for two situations:
duke@1:                 owntype = sym.type;
duke@1:                 if (owntype.tag == CLASS) {
duke@1:                     Type ownOuter = owntype.getEnclosingType();
duke@1: 
duke@1:                     // (a) If the symbol's type is parameterized, erase it
duke@1:                     // because no type parameters were given.
duke@1:                     // We recover generic outer type later in visitTypeApply.
duke@1:                     if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
duke@1:                         owntype = types.erasure(owntype);
duke@1:                     }
duke@1: 
duke@1:                     // (b) If the symbol's type is an inner class, then
duke@1:                     // we have to interpret its outer type as a superclass
duke@1:                     // of the site type. Example:
duke@1:                     //
duke@1:                     // class Tree<A> { class Visitor { ... } }
duke@1:                     // class PointTree extends Tree<Point> { ... }
duke@1:                     // ...PointTree.Visitor...
duke@1:                     //
duke@1:                     // Then the type of the last expression above is
duke@1:                     // Tree<Point>.Visitor.
duke@1:                     else if (ownOuter.tag == CLASS && site != ownOuter) {
duke@1:                         Type normOuter = site;
duke@1:                         if (normOuter.tag == CLASS)
duke@1:                             normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
duke@1:                         if (normOuter == null) // perhaps from an import
duke@1:                             normOuter = types.erasure(ownOuter);
duke@1:                         if (normOuter != ownOuter)
duke@1:                             owntype = new ClassType(
duke@1:                                 normOuter, List.<Type>nil(), owntype.tsym);
duke@1:                     }
duke@1:                 }
duke@1:                 break;
duke@1:             case VAR:
duke@1:                 VarSymbol v = (VarSymbol)sym;
duke@1:                 // Test (4): if symbol is an instance field of a raw type,
duke@1:                 // which is being assigned to, issue an unchecked warning if
duke@1:                 // its type changes under erasure.
duke@1:                 if (allowGenerics &&
duke@1:                     pkind == VAR &&
duke@1:                     v.owner.kind == TYP &&
duke@1:                     (v.flags() & STATIC) == 0 &&
duke@1:                     (site.tag == CLASS || site.tag == TYPEVAR)) {
duke@1:                     Type s = types.asOuterSuper(site, v.owner);
duke@1:                     if (s != null &&
duke@1:                         s.isRaw() &&
duke@1:                         !types.isSameType(v.type, v.erasure(types))) {
duke@1:                         chk.warnUnchecked(tree.pos(),
duke@1:                                           "unchecked.assign.to.var",
duke@1:                                           v, s);
duke@1:                     }
duke@1:                 }
duke@1:                 // The computed type of a variable is the type of the
duke@1:                 // variable symbol, taken as a member of the site type.
duke@1:                 owntype = (sym.owner.kind == TYP &&
duke@1:                            sym.name != names._this && sym.name != names._super)
duke@1:                     ? types.memberType(site, sym)
duke@1:                     : sym.type;
duke@1: 
duke@1:                 if (env.info.tvars.nonEmpty()) {
duke@1:                     Type owntype1 = new ForAll(env.info.tvars, owntype);
duke@1:                     for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail)
duke@1:                         if (!owntype.contains(l.head)) {
duke@1:                             log.error(tree.pos(), "undetermined.type", owntype1);
jjg@110:                             owntype1 = types.createErrorType(owntype1);
duke@1:                         }
duke@1:                     owntype = owntype1;
duke@1:                 }
duke@1: 
duke@1:                 // If the variable is a constant, record constant value in
duke@1:                 // computed type.
duke@1:                 if (v.getConstValue() != null && isStaticReference(tree))
duke@1:                     owntype = owntype.constType(v.getConstValue());
duke@1: 
duke@1:                 if (pkind == VAL) {
duke@1:                     owntype = capture(owntype); // capture "names as expressions"
duke@1:                 }
duke@1:                 break;
duke@1:             case MTH: {
duke@1:                 JCMethodInvocation app = (JCMethodInvocation)env.tree;
duke@1:                 owntype = checkMethod(site, sym, env, app.args,
duke@1:                                       pt.getParameterTypes(), pt.getTypeArguments(),
duke@1:                                       env.info.varArgs);
duke@1:                 break;
duke@1:             }
duke@1:             case PCK: case ERR:
duke@1:                 owntype = sym.type;
duke@1:                 break;
duke@1:             default:
duke@1:                 throw new AssertionError("unexpected kind: " + sym.kind +
duke@1:                                          " in tree " + tree);
duke@1:             }
duke@1: 
duke@1:             // Test (1): emit a `deprecation' warning if symbol is deprecated.
duke@1:             // (for constructors, the error was given when the constructor was
duke@1:             // resolved)
duke@1:             if (sym.name != names.init &&
duke@1:                 (sym.flags() & DEPRECATED) != 0 &&
duke@1:                 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
duke@1:                 sym.outermostClass() != env.info.scope.owner.outermostClass())
duke@1:                 chk.warnDeprecated(tree.pos(), sym);
duke@1: 
duke@1:             if ((sym.flags() & PROPRIETARY) != 0)
duke@1:                 log.strictWarning(tree.pos(), "sun.proprietary", sym);
duke@1: 
duke@1:             // Test (3): if symbol is a variable, check that its type and
duke@1:             // kind are compatible with the prototype and protokind.
duke@1:             return check(tree, owntype, sym.kind, pkind, pt);
duke@1:         }
duke@1: 
duke@1:         /** Check that variable is initialized and evaluate the variable's
duke@1:          *  initializer, if not yet done. Also check that variable is not
duke@1:          *  referenced before it is defined.
duke@1:          *  @param tree    The tree making up the variable reference.
duke@1:          *  @param env     The current environment.
duke@1:          *  @param v       The variable's symbol.
duke@1:          */
duke@1:         private void checkInit(JCTree tree,
duke@1:                                Env<AttrContext> env,
duke@1:                                VarSymbol v,
duke@1:                                boolean onlyWarning) {
duke@1: //          System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
duke@1: //                             tree.pos + " " + v.pos + " " +
duke@1: //                             Resolve.isStatic(env));//DEBUG
duke@1: 
duke@1:             // A forward reference is diagnosed if the declaration position
duke@1:             // of the variable is greater than the current tree position
duke@1:             // and the tree and variable definition occur in the same class
duke@1:             // definition.  Note that writes don't count as references.
duke@1:             // This check applies only to class and instance
duke@1:             // variables.  Local variables follow different scope rules,
duke@1:             // and are subject to definite assignment checking.
mcimadamore@94:             if ((env.info.enclVar == v || v.pos > tree.pos) &&
duke@1:                 v.owner.kind == TYP &&
duke@1:                 canOwnInitializer(env.info.scope.owner) &&
duke@1:                 v.owner == env.info.scope.owner.enclClass() &&
duke@1:                 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
duke@1:                 (env.tree.getTag() != JCTree.ASSIGN ||
duke@1:                  TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
mcimadamore@94:                 String suffix = (env.info.enclVar == v) ?
mcimadamore@94:                                 "self.ref" : "forward.ref";
mcimadamore@18:                 if (!onlyWarning || isStaticEnumField(v)) {
mcimadamore@94:                     log.error(tree.pos(), "illegal." + suffix);
duke@1:                 } else if (useBeforeDeclarationWarning) {
mcimadamore@94:                     log.warning(tree.pos(), suffix, v);
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             v.getConstValue(); // ensure initializer is evaluated
duke@1: 
duke@1:             checkEnumInitializer(tree, env, v);
duke@1:         }
duke@1: 
duke@1:         /**
duke@1:          * Check for illegal references to static members of enum.  In
duke@1:          * an enum type, constructors and initializers may not
duke@1:          * reference its static members unless they are constant.
duke@1:          *
duke@1:          * @param tree    The tree making up the variable reference.
duke@1:          * @param env     The current environment.
duke@1:          * @param v       The variable's symbol.
duke@1:          * @see JLS 3rd Ed. (8.9 Enums)
duke@1:          */
duke@1:         private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
duke@1:             // JLS 3rd Ed.:
duke@1:             //
duke@1:             // "It is a compile-time error to reference a static field
duke@1:             // of an enum type that is not a compile-time constant
duke@1:             // (15.28) from constructors, instance initializer blocks,
duke@1:             // or instance variable initializer expressions of that
duke@1:             // type. It is a compile-time error for the constructors,
duke@1:             // instance initializer blocks, or instance variable
duke@1:             // initializer expressions of an enum constant e to refer
duke@1:             // to itself or to an enum constant of the same type that
duke@1:             // is declared to the right of e."
mcimadamore@18:             if (isStaticEnumField(v)) {
duke@1:                 ClassSymbol enclClass = env.info.scope.owner.enclClass();
duke@1: 
duke@1:                 if (enclClass == null || enclClass.owner == null)
duke@1:                     return;
duke@1: 
duke@1:                 // See if the enclosing class is the enum (or a
duke@1:                 // subclass thereof) declaring v.  If not, this
duke@1:                 // reference is OK.
duke@1:                 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
duke@1:                     return;
duke@1: 
duke@1:                 // If the reference isn't from an initializer, then
duke@1:                 // the reference is OK.
duke@1:                 if (!Resolve.isInitializer(env))
duke@1:                     return;
duke@1: 
duke@1:                 log.error(tree.pos(), "illegal.enum.static.ref");
duke@1:             }
duke@1:         }
duke@1: 
mcimadamore@18:         /** Is the given symbol a static, non-constant field of an Enum?
mcimadamore@18:          *  Note: enum literals should not be regarded as such
mcimadamore@18:          */
mcimadamore@18:         private boolean isStaticEnumField(VarSymbol v) {
mcimadamore@18:             return Flags.isEnum(v.owner) &&
mcimadamore@18:                    Flags.isStatic(v) &&
mcimadamore@18:                    !Flags.isConstant(v) &&
mcimadamore@18:                    v.name != names._class;
duke@1:         }
duke@1: 
duke@1:         /** Can the given symbol be the owner of code which forms part
duke@1:          *  if class initialization? This is the case if the symbol is
duke@1:          *  a type or field, or if the symbol is the synthetic method.
duke@1:          *  owning a block.
duke@1:          */
duke@1:         private boolean canOwnInitializer(Symbol sym) {
duke@1:             return
duke@1:                 (sym.kind & (VAR | TYP)) != 0 ||
duke@1:                 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
duke@1:         }
duke@1: 
duke@1:     Warner noteWarner = new Warner();
duke@1: 
duke@1:     /**
duke@1:      * Check that method arguments conform to its instantation.
duke@1:      **/
duke@1:     public Type checkMethod(Type site,
duke@1:                             Symbol sym,
duke@1:                             Env<AttrContext> env,
duke@1:                             final List<JCExpression> argtrees,
duke@1:                             List<Type> argtypes,
duke@1:                             List<Type> typeargtypes,
duke@1:                             boolean useVarargs) {
duke@1:         // Test (5): if symbol is an instance method of a raw type, issue
duke@1:         // an unchecked warning if its argument types change under erasure.
duke@1:         if (allowGenerics &&
duke@1:             (sym.flags() & STATIC) == 0 &&
duke@1:             (site.tag == CLASS || site.tag == TYPEVAR)) {
duke@1:             Type s = types.asOuterSuper(site, sym.owner);
duke@1:             if (s != null && s.isRaw() &&
duke@1:                 !types.isSameTypes(sym.type.getParameterTypes(),
duke@1:                                    sym.erasure(types).getParameterTypes())) {
duke@1:                 chk.warnUnchecked(env.tree.pos(),
duke@1:                                   "unchecked.call.mbr.of.raw.type",
duke@1:                                   sym, s);
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         // Compute the identifier's instantiated type.
duke@1:         // For methods, we need to compute the instance type by
duke@1:         // Resolve.instantiate from the symbol's type as well as
duke@1:         // any type arguments and value arguments.
duke@1:         noteWarner.warned = false;
duke@1:         Type owntype = rs.instantiate(env,
duke@1:                                       site,
duke@1:                                       sym,
duke@1:                                       argtypes,
duke@1:                                       typeargtypes,
duke@1:                                       true,
duke@1:                                       useVarargs,
duke@1:                                       noteWarner);
duke@1:         boolean warned = noteWarner.warned;
duke@1: 
duke@1:         // If this fails, something went wrong; we should not have
duke@1:         // found the identifier in the first place.
duke@1:         if (owntype == null) {
duke@1:             if (!pt.isErroneous())
duke@1:                 log.error(env.tree.pos(),
duke@1:                           "internal.error.cant.instantiate",
duke@1:                           sym, site,
duke@1:                           Type.toString(pt.getParameterTypes()));
jjg@110:             owntype = types.createErrorType(site);
duke@1:         } else {
duke@1:             // System.out.println("call   : " + env.tree);
duke@1:             // System.out.println("method : " + owntype);
duke@1:             // System.out.println("actuals: " + argtypes);
duke@1:             List<Type> formals = owntype.getParameterTypes();
duke@1:             Type last = useVarargs ? formals.last() : null;
duke@1:             if (sym.name==names.init &&
duke@1:                 sym.owner == syms.enumSym)
duke@1:                 formals = formals.tail.tail;
duke@1:             List<JCExpression> args = argtrees;
duke@1:             while (formals.head != last) {
duke@1:                 JCTree arg = args.head;
duke@1:                 Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head);
duke@1:                 assertConvertible(arg, arg.type, formals.head, warn);
duke@1:                 warned |= warn.warned;
duke@1:                 args = args.tail;
duke@1:                 formals = formals.tail;
duke@1:             }
duke@1:             if (useVarargs) {
duke@1:                 Type varArg = types.elemtype(last);
duke@1:                 while (args.tail != null) {
duke@1:                     JCTree arg = args.head;
duke@1:                     Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg);
duke@1:                     assertConvertible(arg, arg.type, varArg, warn);
duke@1:                     warned |= warn.warned;
duke@1:                     args = args.tail;
duke@1:                 }
duke@1:             } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) {
duke@1:                 // non-varargs call to varargs method
duke@1:                 Type varParam = owntype.getParameterTypes().last();
duke@1:                 Type lastArg = argtypes.last();
duke@1:                 if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) &&
duke@1:                     !types.isSameType(types.erasure(varParam), types.erasure(lastArg)))
duke@1:                     log.warning(argtrees.last().pos(), "inexact.non-varargs.call",
duke@1:                                 types.elemtype(varParam),
duke@1:                                 varParam);
duke@1:             }
duke@1: 
duke@1:             if (warned && sym.type.tag == FORALL) {
duke@1:                 chk.warnUnchecked(env.tree.pos(),
duke@1:                                   "unchecked.meth.invocation.applied",
mcimadamore@161:                                   kindName(sym),
mcimadamore@161:                                   sym.name,
mcimadamore@161:                                   rs.methodArguments(sym.type.getParameterTypes()),
mcimadamore@161:                                   rs.methodArguments(argtypes),
mcimadamore@161:                                   kindName(sym.location()),
mcimadamore@161:                                   sym.location());
duke@1:                 owntype = new MethodType(owntype.getParameterTypes(),
duke@1:                                          types.erasure(owntype.getReturnType()),
duke@1:                                          owntype.getThrownTypes(),
duke@1:                                          syms.methodClass);
duke@1:             }
duke@1:             if (useVarargs) {
duke@1:                 JCTree tree = env.tree;
duke@1:                 Type argtype = owntype.getParameterTypes().last();
duke@1:                 if (!types.isReifiable(argtype))
duke@1:                     chk.warnUnchecked(env.tree.pos(),
duke@1:                                       "unchecked.generic.array.creation",
duke@1:                                       argtype);
duke@1:                 Type elemtype = types.elemtype(argtype);
duke@1:                 switch (tree.getTag()) {
duke@1:                 case JCTree.APPLY:
duke@1:                     ((JCMethodInvocation) tree).varargsElement = elemtype;
duke@1:                     break;
duke@1:                 case JCTree.NEWCLASS:
duke@1:                     ((JCNewClass) tree).varargsElement = elemtype;
duke@1:                     break;
duke@1:                 default:
duke@1:                     throw new AssertionError(""+tree);
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1:         return owntype;
duke@1:     }
duke@1: 
duke@1:     private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) {
duke@1:         if (types.isConvertible(actual, formal, warn))
duke@1:             return;
duke@1: 
duke@1:         if (formal.isCompound()
duke@1:             && types.isSubtype(actual, types.supertype(formal))
duke@1:             && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn))
duke@1:             return;
duke@1: 
duke@1:         if (false) {
duke@1:             // TODO: make assertConvertible work
mcimadamore@89:             chk.typeError(tree.pos(), diags.fragment("incompatible.types"), actual, formal);
duke@1:             throw new AssertionError("Tree: " + tree
duke@1:                                      + " actual:" + actual
duke@1:                                      + " formal: " + formal);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void visitLiteral(JCLiteral tree) {
duke@1:         result = check(
duke@1:             tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt);
duke@1:     }
duke@1:     //where
duke@1:     /** Return the type of a literal with given type tag.
duke@1:      */
duke@1:     Type litType(int tag) {
duke@1:         return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag];
duke@1:     }
duke@1: 
duke@1:     public void visitTypeIdent(JCPrimitiveTypeTree tree) {
duke@1:         result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitTypeArray(JCArrayTypeTree tree) {
duke@1:         Type etype = attribType(tree.elemtype, env);
duke@1:         Type type = new ArrayType(etype, syms.arrayClass);
duke@1:         result = check(tree, type, TYP, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     /** Visitor method for parameterized types.
duke@1:      *  Bound checking is left until later, since types are attributed
duke@1:      *  before supertype structure is completely known
duke@1:      */
duke@1:     public void visitTypeApply(JCTypeApply tree) {
jjg@110:         Type owntype = types.createErrorType(tree.type);
duke@1: 
duke@1:         // Attribute functor part of application and make sure it's a class.
duke@1:         Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
duke@1: 
duke@1:         // Attribute type parameters
duke@1:         List<Type> actuals = attribTypes(tree.arguments, env);
duke@1: 
duke@1:         if (clazztype.tag == CLASS) {
duke@1:             List<Type> formals = clazztype.tsym.type.getTypeArguments();
duke@1: 
duke@1:             if (actuals.length() == formals.length()) {
duke@1:                 List<Type> a = actuals;
duke@1:                 List<Type> f = formals;
duke@1:                 while (a.nonEmpty()) {
duke@1:                     a.head = a.head.withTypeVar(f.head);
duke@1:                     a = a.tail;
duke@1:                     f = f.tail;
duke@1:                 }
duke@1:                 // Compute the proper generic outer
duke@1:                 Type clazzOuter = clazztype.getEnclosingType();
duke@1:                 if (clazzOuter.tag == CLASS) {
duke@1:                     Type site;
duke@1:                     if (tree.clazz.getTag() == JCTree.IDENT) {
duke@1:                         site = env.enclClass.sym.type;
duke@1:                     } else if (tree.clazz.getTag() == JCTree.SELECT) {
duke@1:                         site = ((JCFieldAccess) tree.clazz).selected.type;
duke@1:                     } else throw new AssertionError(""+tree);
duke@1:                     if (clazzOuter.tag == CLASS && site != clazzOuter) {
duke@1:                         if (site.tag == CLASS)
duke@1:                             site = types.asOuterSuper(site, clazzOuter.tsym);
duke@1:                         if (site == null)
duke@1:                             site = types.erasure(clazzOuter);
duke@1:                         clazzOuter = site;
duke@1:                     }
duke@1:                 }
duke@1:                 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
duke@1:             } else {
duke@1:                 if (formals.length() != 0) {
duke@1:                     log.error(tree.pos(), "wrong.number.type.args",
duke@1:                               Integer.toString(formals.length()));
duke@1:                 } else {
duke@1:                     log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
duke@1:                 }
jjg@110:                 owntype = types.createErrorType(tree.type);
duke@1:             }
duke@1:         }
duke@1:         result = check(tree, owntype, TYP, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitTypeParameter(JCTypeParameter tree) {
duke@1:         TypeVar a = (TypeVar)tree.type;
duke@1:         Set<Type> boundSet = new HashSet<Type>();
duke@1:         if (a.bound.isErroneous())
duke@1:             return;
duke@1:         List<Type> bs = types.getBounds(a);
duke@1:         if (tree.bounds.nonEmpty()) {
duke@1:             // accept class or interface or typevar as first bound.
duke@1:             Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false);
duke@1:             boundSet.add(types.erasure(b));
mcimadamore@159:             if (b.isErroneous()) {
mcimadamore@159:                 a.bound = b;
mcimadamore@159:             }
mcimadamore@159:             else if (b.tag == TYPEVAR) {
duke@1:                 // if first bound was a typevar, do not accept further bounds.
duke@1:                 if (tree.bounds.tail.nonEmpty()) {
duke@1:                     log.error(tree.bounds.tail.head.pos(),
duke@1:                               "type.var.may.not.be.followed.by.other.bounds");
duke@1:                     tree.bounds = List.of(tree.bounds.head);
mcimadamore@7:                     a.bound = bs.head;
duke@1:                 }
duke@1:             } else {
duke@1:                 // if first bound was a class or interface, accept only interfaces
duke@1:                 // as further bounds.
duke@1:                 for (JCExpression bound : tree.bounds.tail) {
duke@1:                     bs = bs.tail;
duke@1:                     Type i = checkBase(bs.head, bound, env, false, true, false);
mcimadamore@159:                     if (i.isErroneous())
mcimadamore@159:                         a.bound = i;
mcimadamore@159:                     else if (i.tag == CLASS)
duke@1:                         chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet);
duke@1:                 }
duke@1:             }
duke@1:         }
duke@1:         bs = types.getBounds(a);
duke@1: 
duke@1:         // in case of multiple bounds ...
duke@1:         if (bs.length() > 1) {
duke@1:             // ... the variable's bound is a class type flagged COMPOUND
duke@1:             // (see comment for TypeVar.bound).
duke@1:             // In this case, generate a class tree that represents the
duke@1:             // bound class, ...
duke@1:             JCTree extending;
duke@1:             List<JCExpression> implementing;
duke@1:             if ((bs.head.tsym.flags() & INTERFACE) == 0) {
duke@1:                 extending = tree.bounds.head;
duke@1:                 implementing = tree.bounds.tail;
duke@1:             } else {
duke@1:                 extending = null;
duke@1:                 implementing = tree.bounds;
duke@1:             }
duke@1:             JCClassDecl cd = make.at(tree.pos).ClassDef(
duke@1:                 make.Modifiers(PUBLIC | ABSTRACT),
duke@1:                 tree.name, List.<JCTypeParameter>nil(),
duke@1:                 extending, implementing, List.<JCTree>nil());
duke@1: 
duke@1:             ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym;
duke@1:             assert (c.flags() & COMPOUND) != 0;
duke@1:             cd.sym = c;
duke@1:             c.sourcefile = env.toplevel.sourcefile;
duke@1: 
duke@1:             // ... and attribute the bound class
duke@1:             c.flags_field |= UNATTRIBUTED;
duke@1:             Env<AttrContext> cenv = enter.classEnv(cd, env);
duke@1:             enter.typeEnvs.put(c, cenv);
duke@1:         }
duke@1:     }
duke@1: 
duke@1: 
duke@1:     public void visitWildcard(JCWildcard tree) {
duke@1:         //- System.err.println("visitWildcard("+tree+");");//DEBUG
duke@1:         Type type = (tree.kind.kind == BoundKind.UNBOUND)
duke@1:             ? syms.objectType
duke@1:             : attribType(tree.inner, env);
duke@1:         result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
duke@1:                                               tree.kind.kind,
duke@1:                                               syms.boundClass),
duke@1:                        TYP, pkind, pt);
duke@1:     }
duke@1: 
duke@1:     public void visitAnnotation(JCAnnotation tree) {
duke@1:         log.error(tree.pos(), "annotation.not.valid.for.type", pt);
duke@1:         result = tree.type = syms.errType;
duke@1:     }
duke@1: 
duke@1:     public void visitErroneous(JCErroneous tree) {
duke@1:         if (tree.errs != null)
duke@1:             for (JCTree err : tree.errs)
duke@1:                 attribTree(err, env, ERR, pt);
duke@1:         result = tree.type = syms.errType;
duke@1:     }
duke@1: 
duke@1:     /** Default visitor method for all other trees.
duke@1:      */
duke@1:     public void visitTree(JCTree tree) {
duke@1:         throw new AssertionError();
duke@1:     }
duke@1: 
duke@1:     /** Main method: attribute class definition associated with given class symbol.
duke@1:      *  reporting completion failures at the given position.
duke@1:      *  @param pos The source position at which completion errors are to be
duke@1:      *             reported.
duke@1:      *  @param c   The class symbol whose definition will be attributed.
duke@1:      */
duke@1:     public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
duke@1:         try {
duke@1:             annotate.flush();
duke@1:             attribClass(c);
duke@1:         } catch (CompletionFailure ex) {
duke@1:             chk.completionError(pos, ex);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Attribute class definition associated with given class symbol.
duke@1:      *  @param c   The class symbol whose definition will be attributed.
duke@1:      */
duke@1:     void attribClass(ClassSymbol c) throws CompletionFailure {
duke@1:         if (c.type.tag == ERROR) return;
duke@1: 
duke@1:         // Check for cycles in the inheritance graph, which can arise from
duke@1:         // ill-formed class files.
duke@1:         chk.checkNonCyclic(null, c.type);
duke@1: 
duke@1:         Type st = types.supertype(c.type);
duke@1:         if ((c.flags_field & Flags.COMPOUND) == 0) {
duke@1:             // First, attribute superclass.
duke@1:             if (st.tag == CLASS)
duke@1:                 attribClass((ClassSymbol)st.tsym);
duke@1: 
duke@1:             // Next attribute owner, if it is a class.
duke@1:             if (c.owner.kind == TYP && c.owner.type.tag == CLASS)
duke@1:                 attribClass((ClassSymbol)c.owner);
duke@1:         }
duke@1: 
duke@1:         // The previous operations might have attributed the current class
duke@1:         // if there was a cycle. So we test first whether the class is still
duke@1:         // UNATTRIBUTED.
duke@1:         if ((c.flags_field & UNATTRIBUTED) != 0) {
duke@1:             c.flags_field &= ~UNATTRIBUTED;
duke@1: 
duke@1:             // Get environment current at the point of class definition.
duke@1:             Env<AttrContext> env = enter.typeEnvs.get(c);
duke@1: 
duke@1:             // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
duke@1:             // because the annotations were not available at the time the env was created. Therefore,
duke@1:             // we look up the environment chain for the first enclosing environment for which the
duke@1:             // lint value is set. Typically, this is the parent env, but might be further if there
duke@1:             // are any envs created as a result of TypeParameter nodes.
duke@1:             Env<AttrContext> lintEnv = env;
duke@1:             while (lintEnv.info.lint == null)
duke@1:                 lintEnv = lintEnv.next;
duke@1: 
duke@1:             // Having found the enclosing lint value, we can initialize the lint value for this class
duke@1:             env.info.lint = lintEnv.info.lint.augment(c.attributes_field, c.flags());
duke@1: 
duke@1:             Lint prevLint = chk.setLint(env.info.lint);
duke@1:             JavaFileObject prev = log.useSource(c.sourcefile);
duke@1: 
duke@1:             try {
duke@1:                 // java.lang.Enum may not be subclassed by a non-enum
duke@1:                 if (st.tsym == syms.enumSym &&
duke@1:                     ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
duke@1:                     log.error(env.tree.pos(), "enum.no.subclassing");
duke@1: 
duke@1:                 // Enums may not be extended by source-level classes
duke@1:                 if (st.tsym != null &&
duke@1:                     ((st.tsym.flags_field & Flags.ENUM) != 0) &&
mcimadamore@82:                     ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
duke@1:                     !target.compilerBootstrap(c)) {
duke@1:                     log.error(env.tree.pos(), "enum.types.not.extensible");
duke@1:                 }
duke@1:                 attribClassBody(env, c);
duke@1: 
duke@1:                 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
duke@1:             } finally {
duke@1:                 log.useSource(prev);
duke@1:                 chk.setLint(prevLint);
duke@1:             }
duke@1: 
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void visitImport(JCImport tree) {
duke@1:         // nothing to do
duke@1:     }
duke@1: 
duke@1:     /** Finish the attribution of a class. */
duke@1:     private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
duke@1:         JCClassDecl tree = (JCClassDecl)env.tree;
duke@1:         assert c == tree.sym;
duke@1: 
duke@1:         // Validate annotations
duke@1:         chk.validateAnnotations(tree.mods.annotations, c);
duke@1: 
duke@1:         // Validate type parameters, supertype and interfaces.
mcimadamore@42:         attribBounds(tree.typarams);
mcimadamore@122:         chk.validate(tree.typarams, env);
mcimadamore@122:         chk.validate(tree.extending, env);
mcimadamore@122:         chk.validate(tree.implementing, env);
duke@1: 
duke@1:         // If this is a non-abstract class, check that it has no abstract
duke@1:         // methods or unimplemented methods of an implemented interface.
duke@1:         if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
duke@1:             if (!relax)
duke@1:                 chk.checkAllDefined(tree.pos(), c);
duke@1:         }
duke@1: 
duke@1:         if ((c.flags() & ANNOTATION) != 0) {
duke@1:             if (tree.implementing.nonEmpty())
duke@1:                 log.error(tree.implementing.head.pos(),
duke@1:                           "cant.extend.intf.annotation");
duke@1:             if (tree.typarams.nonEmpty())
duke@1:                 log.error(tree.typarams.head.pos(),
duke@1:                           "intf.annotation.cant.have.type.params");
duke@1:         } else {
duke@1:             // Check that all extended classes and interfaces
duke@1:             // are compatible (i.e. no two define methods with same arguments
duke@1:             // yet different return types).  (JLS 8.4.6.3)
duke@1:             chk.checkCompatibleSupertypes(tree.pos(), c.type);
duke@1:         }
duke@1: 
duke@1:         // Check that class does not import the same parameterized interface
duke@1:         // with two different argument lists.
duke@1:         chk.checkClassBounds(tree.pos(), c.type);
duke@1: 
duke@1:         tree.type = c.type;
duke@1: 
duke@1:         boolean assertsEnabled = false;
duke@1:         assert assertsEnabled = true;
duke@1:         if (assertsEnabled) {
duke@1:             for (List<JCTypeParameter> l = tree.typarams;
duke@1:                  l.nonEmpty(); l = l.tail)
duke@1:                 assert env.info.scope.lookup(l.head.name).scope != null;
duke@1:         }
duke@1: 
duke@1:         // Check that a generic class doesn't extend Throwable
duke@1:         if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
duke@1:             log.error(tree.extending.pos(), "generic.throwable");
duke@1: 
duke@1:         // Check that all methods which implement some
duke@1:         // method conform to the method they implement.
duke@1:         chk.checkImplementations(tree);
duke@1: 
duke@1:         for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
duke@1:             // Attribute declaration
duke@1:             attribStat(l.head, env);
duke@1:             // Check that declarations in inner classes are not static (JLS 8.1.2)
duke@1:             // Make an exception for static constants.
duke@1:             if (c.owner.kind != PCK &&
duke@1:                 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
duke@1:                 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
duke@1:                 Symbol sym = null;
duke@1:                 if (l.head.getTag() == JCTree.VARDEF) sym = ((JCVariableDecl) l.head).sym;
duke@1:                 if (sym == null ||
duke@1:                     sym.kind != VAR ||
duke@1:                     ((VarSymbol) sym).getConstValue() == null)
duke@1:                     log.error(l.head.pos(), "icls.cant.have.static.decl");
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         // Check for cycles among non-initial constructors.
duke@1:         chk.checkCyclicConstructors(tree);
duke@1: 
duke@1:         // Check for cycles among annotation elements.
duke@1:         chk.checkNonCyclicElements(tree);
duke@1: 
duke@1:         // Check for proper use of serialVersionUID
duke@1:         if (env.info.lint.isEnabled(Lint.LintCategory.SERIAL) &&
duke@1:             isSerializable(c) &&
duke@1:             (c.flags() & Flags.ENUM) == 0 &&
duke@1:             (c.flags() & ABSTRACT) == 0) {
duke@1:             checkSerialVersionUID(tree, c);
duke@1:         }
duke@1:     }
duke@1:         // where
duke@1:         /** check if a class is a subtype of Serializable, if that is available. */
duke@1:         private boolean isSerializable(ClassSymbol c) {
duke@1:             try {
duke@1:                 syms.serializableType.complete();
duke@1:             }
duke@1:             catch (CompletionFailure e) {
duke@1:                 return false;
duke@1:             }
duke@1:             return types.isSubtype(c.type, syms.serializableType);
duke@1:         }
duke@1: 
duke@1:         /** Check that an appropriate serialVersionUID member is defined. */
duke@1:         private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
duke@1: 
duke@1:             // check for presence of serialVersionUID
duke@1:             Scope.Entry e = c.members().lookup(names.serialVersionUID);
duke@1:             while (e.scope != null && e.sym.kind != VAR) e = e.next();
duke@1:             if (e.scope == null) {
duke@1:                 log.warning(tree.pos(), "missing.SVUID", c);
duke@1:                 return;
duke@1:             }
duke@1: 
duke@1:             // check that it is static final
duke@1:             VarSymbol svuid = (VarSymbol)e.sym;
duke@1:             if ((svuid.flags() & (STATIC | FINAL)) !=
duke@1:                 (STATIC | FINAL))
duke@1:                 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
duke@1: 
duke@1:             // check that it is long
duke@1:             else if (svuid.type.tag != TypeTags.LONG)
duke@1:                 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
duke@1: 
duke@1:             // check constant
duke@1:             else if (svuid.getConstValue() == null)
duke@1:                 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
duke@1:         }
duke@1: 
duke@1:     private Type capture(Type type) {
duke@1:         return types.capture(type);
duke@1:     }
duke@1: }