jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/parser/JavacParser.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/parser/JavacParser.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/parser/JavacParser.java

Thu, 25 Oct 2012 11:09:36 -0700

author: jjg
date: Thu, 25 Oct 2012 11:09:36 -0700
changeset 1374: c002fdee76fd
parent 1366: 12cf6bfd8c05
child 1400: 19d6ba779759
permissions: -rw-r--r--

7200915: convert TypeTags from a series of small ints to an enum
Reviewed-by: jjg, mcimadamore
Contributed-by: vicente.romero@oracle.com

 /*
  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.tools.javac.parser;
 import java.util.*;
 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.parser.Tokens.*;
 import com.sun.tools.javac.parser.Tokens.Comment.CommentStyle;
 import com.sun.tools.javac.tree.*;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.util.List;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.*;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.ASSERT;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.CASE;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.CATCH;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.EQ;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.GT;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.IMPORT;
 import static com.sun.tools.javac.parser.Tokens.TokenKind.LT;
 import static com.sun.tools.javac.util.ListBuffer.lb;
 import static com.sun.tools.javac.tree.JCTree.Tag.*;
 /** The parser maps a token sequence into an abstract syntax
  *  tree. It operates by recursive descent, with code derived
  *  systematically from an LL(1) grammar. For efficiency reasons, an
  *  operator precedence scheme is used for parsing binary operation
  *  expressions.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class JavacParser implements Parser {
     /** The number of precedence levels of infix operators.
      */
     private static final int infixPrecedenceLevels = 10;
     /** The scanner used for lexical analysis.
      */
     protected Lexer S;
     /** The factory to be used for abstract syntax tree construction.
      */
     protected TreeMaker F;
     /** The log to be used for error diagnostics.
      */
     private Log log;
     /** The Source language setting. */
     private Source source;
     /** The name table. */
     private Names names;
     /** End position mappings container */
     private final AbstractEndPosTable endPosTable;
     /** Construct a parser from a given scanner, tree factory and log.
      */
     protected JavacParser(ParserFactory fac,
                      Lexer S,
                      boolean keepDocComments,
                      boolean keepLineMap,
                      boolean keepEndPositions) {
         this.S = S;
         nextToken(); // prime the pump
         this.F = fac.F;
         this.log = fac.log;
         this.names = fac.names;
         this.source = fac.source;
         this.allowGenerics = source.allowGenerics();
         this.allowVarargs = source.allowVarargs();
         this.allowAsserts = source.allowAsserts();
         this.allowEnums = source.allowEnums();
         this.allowForeach = source.allowForeach();
         this.allowStaticImport = source.allowStaticImport();
         this.allowAnnotations = source.allowAnnotations();
         this.allowTWR = source.allowTryWithResources();
         this.allowDiamond = source.allowDiamond();
         this.allowMulticatch = source.allowMulticatch();
         this.allowStringFolding = fac.options.getBoolean("allowStringFolding", true);
         this.allowLambda = source.allowLambda() &&
                 fac.options.isSet("allowLambda"); //pre-lambda guard
         this.allowMethodReferences = source.allowMethodReferences() &&
                 fac.options.isSet("allowMethodReferences"); //pre-lambda guard
         this.allowDefaultMethods = source.allowDefaultMethods() &&
                 fac.options.isSet("allowDefaultMethods"); //pre-lambda guard
         this.keepDocComments = keepDocComments;
         docComments = newDocCommentTable(keepDocComments);
         this.keepLineMap = keepLineMap;
         this.errorTree = F.Erroneous();
         endPosTable = newEndPosTable(keepEndPositions);
     }
     protected AbstractEndPosTable newEndPosTable(boolean keepEndPositions) {
         return  keepEndPositions
                 ? new SimpleEndPosTable()
                 : new EmptyEndPosTable();
     }
     protected DocCommentTable newDocCommentTable(boolean keepDocComments) {
         return keepDocComments ? new SimpleDocCommentTable() : null;
     }
     /** Switch: Should generics be recognized?
      */
     boolean allowGenerics;
     /** Switch: Should diamond operator be recognized?
      */
     boolean allowDiamond;
     /** Switch: Should multicatch clause be accepted?
      */
     boolean allowMulticatch;
     /** Switch: Should varargs be recognized?
      */
     boolean allowVarargs;
     /** Switch: should we recognize assert statements, or just give a warning?
      */
     boolean allowAsserts;
     /** Switch: should we recognize enums, or just give a warning?
      */
     boolean allowEnums;
     /** Switch: should we recognize foreach?
      */
     boolean allowForeach;
     /** Switch: should we recognize foreach?
      */
     boolean allowStaticImport;
     /** Switch: should we recognize annotations?
      */
     boolean allowAnnotations;
     /** Switch: should we recognize try-with-resources?
      */
     boolean allowTWR;
     /** Switch: should we fold strings?
      */
     boolean allowStringFolding;
     /** Switch: should we recognize lambda expressions?
      */
     boolean allowLambda;
     /** Switch: should we allow method/constructor references?
      */
     boolean allowMethodReferences;
     /** Switch: should we allow default methods in interfaces?
      */
     boolean allowDefaultMethods;
     /** Switch: should we keep docComments?
      */
     boolean keepDocComments;
     /** Switch: should we keep line table?
      */
     boolean keepLineMap;
     /** When terms are parsed, the mode determines which is expected:
      *     mode = EXPR        : an expression
      *     mode = TYPE        : a type
      *     mode = NOPARAMS    : no parameters allowed for type
      *     mode = TYPEARG     : type argument
      */
     static final int EXPR = 0x1;
     static final int TYPE = 0x2;
     static final int NOPARAMS = 0x4;
     static final int TYPEARG = 0x8;
     static final int DIAMOND = 0x10;
     /** The current mode.
      */
     private int mode = 0;
     /** The mode of the term that was parsed last.
      */
     private int lastmode = 0;
     /* ---------- token management -------------- */
     protected Token token;
     protected void nextToken() {
         S.nextToken();
         token = S.token();
     }
     protected boolean peekToken(TokenKind tk) {
         return S.token(1).kind == tk;
     }
     protected boolean peekToken(TokenKind tk1, TokenKind tk2) {
         return S.token(1).kind == tk1 &&
                 S.token(2).kind == tk2;
     }
     protected boolean peekToken(TokenKind tk1, TokenKind tk2, TokenKind tk3) {
         return S.token(1).kind == tk1 &&
                 S.token(2).kind == tk2 &&
                 S.token(3).kind == tk3;
     }
     protected boolean peekToken(TokenKind... kinds) {
         for (int lookahead = 0 ; lookahead < kinds.length ; lookahead++) {
             if (S.token(lookahead + 1).kind != kinds[lookahead]) {
                 return false;
             }
         }
         return true;
     }
     /* ---------- error recovery -------------- */
     private JCErroneous errorTree;
     /** Skip forward until a suitable stop token is found.
      */
     private void skip(boolean stopAtImport, boolean stopAtMemberDecl, boolean stopAtIdentifier, boolean stopAtStatement) {
          while (true) {
              switch (token.kind) {
                 case SEMI:
                     nextToken();
                     return;
                 case PUBLIC:
                 case FINAL:
                 case ABSTRACT:
                 case MONKEYS_AT:
                 case EOF:
                 case CLASS:
                 case INTERFACE:
                 case ENUM:
                     return;
                 case IMPORT:
                     if (stopAtImport)
                         return;
                     break;
                 case LBRACE:
                 case RBRACE:
                 case PRIVATE:
                 case PROTECTED:
                 case STATIC:
                 case TRANSIENT:
                 case NATIVE:
                 case VOLATILE:
                 case SYNCHRONIZED:
                 case STRICTFP:
                 case LT:
                 case BYTE:
                 case SHORT:
                 case CHAR:
                 case INT:
                 case LONG:
                 case FLOAT:
                 case DOUBLE:
                 case BOOLEAN:
                 case VOID:
                     if (stopAtMemberDecl)
                         return;
                     break;
                 case IDENTIFIER:
                    if (stopAtIdentifier)
                         return;
                     break;
                 case CASE:
                 case DEFAULT:
                 case IF:
                 case FOR:
                 case WHILE:
                 case DO:
                 case TRY:
                 case SWITCH:
                 case RETURN:
                 case THROW:
                 case BREAK:
                 case CONTINUE:
                 case ELSE:
                 case FINALLY:
                 case CATCH:
                     if (stopAtStatement)
                         return;
                     break;
             }
             nextToken();
         }
     }
     private JCErroneous syntaxError(int pos, String key, TokenKind... args) {
         return syntaxError(pos, List.<JCTree>nil(), key, args);
     }
     private JCErroneous syntaxError(int pos, List<JCTree> errs, String key, TokenKind... args) {
         setErrorEndPos(pos);
         JCErroneous err = F.at(pos).Erroneous(errs);
         reportSyntaxError(err, key, (Object[])args);
         if (errs != null) {
             JCTree last = errs.last();
             if (last != null)
                 storeEnd(last, pos);
         }
         return toP(err);
     }
     private int errorPos = Position.NOPOS;
     /**
      * Report a syntax using the given the position parameter and arguments,
      * unless one was already reported at the same position.
      */
     private void reportSyntaxError(int pos, String key, Object... args) {
         JCDiagnostic.DiagnosticPosition diag = new JCDiagnostic.SimpleDiagnosticPosition(pos);
         reportSyntaxError(diag, key, args);
     }
     /**
      * Report a syntax error using the given DiagnosticPosition object and
      * arguments, unless one was already reported at the same position.
      */
     private void reportSyntaxError(JCDiagnostic.DiagnosticPosition diagPos, String key, Object... args) {
         int pos = diagPos.getPreferredPosition();
         if (pos > S.errPos() || pos == Position.NOPOS) {
             if (token.kind == EOF) {
                 error(diagPos, "premature.eof");
             } else {
                 error(diagPos, key, args);
             }
         }
         S.errPos(pos);
         if (token.pos == errorPos)
             nextToken(); // guarantee progress
         errorPos = token.pos;
     }
     /** Generate a syntax error at current position unless one was already
      *  reported at the same position.
      */
     private JCErroneous syntaxError(String key) {
         return syntaxError(token.pos, key);
     }
     /** Generate a syntax error at current position unless one was
      *  already reported at the same position.
      */
     private JCErroneous syntaxError(String key, TokenKind arg) {
         return syntaxError(token.pos, key, arg);
     }
     /** If next input token matches given token, skip it, otherwise report
      *  an error.
      */
     public void accept(TokenKind tk) {
         if (token.kind == tk) {
             nextToken();
         } else {
             setErrorEndPos(token.pos);
             reportSyntaxError(S.prevToken().endPos, "expected", tk);
         }
     }
     /** Report an illegal start of expression/type error at given position.
      */
     JCExpression illegal(int pos) {
         setErrorEndPos(pos);
         if ((mode & EXPR) != 0)
             return syntaxError(pos, "illegal.start.of.expr");
         else
             return syntaxError(pos, "illegal.start.of.type");
     }
     /** Report an illegal start of expression/type error at current position.
      */
     JCExpression illegal() {
         return illegal(token.pos);
     }
     /** Diagnose a modifier flag from the set, if any. */
     void checkNoMods(long mods) {
         if (mods != 0) {
             long lowestMod = mods & -mods;
             error(token.pos, "mod.not.allowed.here",
                       Flags.asFlagSet(lowestMod));
         }
     }
 /* ---------- doc comments --------- */
     /** A table to store all documentation comments
      *  indexed by the tree nodes they refer to.
      *  defined only if option flag keepDocComment is set.
      */
     private final DocCommentTable docComments;
     /** Make an entry into docComments hashtable,
      *  provided flag keepDocComments is set and given doc comment is non-null.
      *  @param tree   The tree to be used as index in the hashtable
      *  @param dc     The doc comment to associate with the tree, or null.
      */
     void attach(JCTree tree, Comment dc) {
         if (keepDocComments && dc != null) {
 //          System.out.println("doc comment = ");System.out.println(dc);//DEBUG
             docComments.putComment(tree, dc);
         }
     }
 /* -------- source positions ------- */
     private void setErrorEndPos(int errPos) {
         endPosTable.setErrorEndPos(errPos);
     }
     private void storeEnd(JCTree tree, int endpos) {
         endPosTable.storeEnd(tree, endpos);
     }
     private <T extends JCTree> T to(T t) {
         return endPosTable.to(t);
     }
     private <T extends JCTree> T toP(T t) {
         return endPosTable.toP(t);
     }
     /** Get the start position for a tree node.  The start position is
      * defined to be the position of the first character of the first
      * token of the node's source text.
      * @param tree  The tree node
      */
     public int getStartPos(JCTree tree) {
         return TreeInfo.getStartPos(tree);
     }
     /**
      * Get the end position for a tree node.  The end position is
      * defined to be the position of the last character of the last
      * token of the node's source text.  Returns Position.NOPOS if end
      * positions are not generated or the position is otherwise not
      * found.
      * @param tree  The tree node
      */
     public int getEndPos(JCTree tree) {
         return endPosTable.getEndPos(tree);
     }
 /* ---------- parsing -------------- */
     /**
      * Ident = IDENTIFIER
      */
     Name ident() {
         if (token.kind == IDENTIFIER) {
             Name name = token.name();
             nextToken();
             return name;
         } else if (token.kind == ASSERT) {
             if (allowAsserts) {
                 error(token.pos, "assert.as.identifier");
                 nextToken();
                 return names.error;
             } else {
                 warning(token.pos, "assert.as.identifier");
                 Name name = token.name();
                 nextToken();
                 return name;
             }
         } else if (token.kind == ENUM) {
             if (allowEnums) {
                 error(token.pos, "enum.as.identifier");
                 nextToken();
                 return names.error;
             } else {
                 warning(token.pos, "enum.as.identifier");
                 Name name = token.name();
                 nextToken();
                 return name;
             }
         } else {
             accept(IDENTIFIER);
             return names.error;
         }
 }
     /**
      * Qualident = Ident { DOT Ident }
      */
     public JCExpression qualident() {
         JCExpression t = toP(F.at(token.pos).Ident(ident()));
         while (token.kind == DOT) {
             int pos = token.pos;
             nextToken();
             t = toP(F.at(pos).Select(t, ident()));
         }
         return t;
     }
     JCExpression literal(Name prefix) {
         return literal(prefix, token.pos);
     }
     /**
      * Literal =
      *     INTLITERAL
      *   | LONGLITERAL
      *   | FLOATLITERAL
      *   | DOUBLELITERAL
      *   | CHARLITERAL
      *   | STRINGLITERAL
      *   | TRUE
      *   | FALSE
      *   | NULL
      */
     JCExpression literal(Name prefix, int pos) {
         JCExpression t = errorTree;
         switch (token.kind) {
         case INTLITERAL:
             try {
                 t = F.at(pos).Literal(
                     TypeTag.INT,
                     Convert.string2int(strval(prefix), token.radix()));
             } catch (NumberFormatException ex) {
                 error(token.pos, "int.number.too.large", strval(prefix));
             }
             break;
         case LONGLITERAL:
             try {
                 t = F.at(pos).Literal(
                     TypeTag.LONG,
                     new Long(Convert.string2long(strval(prefix), token.radix())));
             } catch (NumberFormatException ex) {
                 error(token.pos, "int.number.too.large", strval(prefix));
             }
             break;
         case FLOATLITERAL: {
             String proper = token.radix() == 16 ?
                     ("0x"+ token.stringVal()) :
                     token.stringVal();
             Float n;
             try {
                 n = Float.valueOf(proper);
             } catch (NumberFormatException ex) {
                 // error already reported in scanner
                 n = Float.NaN;
             }
             if (n.floatValue() == 0.0f && !isZero(proper))
                 error(token.pos, "fp.number.too.small");
             else if (n.floatValue() == Float.POSITIVE_INFINITY)
                 error(token.pos, "fp.number.too.large");
             else
                 t = F.at(pos).Literal(TypeTag.FLOAT, n);
             break;
         }
         case DOUBLELITERAL: {
             String proper = token.radix() == 16 ?
                     ("0x"+ token.stringVal()) :
                     token.stringVal();
             Double n;
             try {
                 n = Double.valueOf(proper);
             } catch (NumberFormatException ex) {
                 // error already reported in scanner
                 n = Double.NaN;
             }
             if (n.doubleValue() == 0.0d && !isZero(proper))
                 error(token.pos, "fp.number.too.small");
             else if (n.doubleValue() == Double.POSITIVE_INFINITY)
                 error(token.pos, "fp.number.too.large");
             else
                 t = F.at(pos).Literal(TypeTag.DOUBLE, n);
             break;
         }
         case CHARLITERAL:
             t = F.at(pos).Literal(
                 TypeTag.CHAR,
                 token.stringVal().charAt(0) + 0);
             break;
         case STRINGLITERAL:
             t = F.at(pos).Literal(
                 TypeTag.CLASS,
                 token.stringVal());
             break;
         case TRUE: case FALSE:
             t = F.at(pos).Literal(
                 TypeTag.BOOLEAN,
                 (token.kind == TRUE ? 1 : 0));
             break;
         case NULL:
             t = F.at(pos).Literal(
                 TypeTag.BOT,
                 null);
             break;
         default:
             Assert.error();
         }
         if (t == errorTree)
             t = F.at(pos).Erroneous();
         storeEnd(t, token.endPos);
         nextToken();
         return t;
     }
 //where
         boolean isZero(String s) {
             char[] cs = s.toCharArray();
             int base = ((cs.length > 1 && Character.toLowerCase(cs[1]) == 'x') ? 16 : 10);
             int i = ((base==16) ? 2 : 0);
             while (i < cs.length && (cs[i] == '0' || cs[i] == '.')) i++;
             return !(i < cs.length && (Character.digit(cs[i], base) > 0));
         }
         String strval(Name prefix) {
             String s = token.stringVal();
             return prefix.isEmpty() ? s : prefix + s;
         }
     /** terms can be either expressions or types.
      */
     public JCExpression parseExpression() {
         return term(EXPR);
     }
     public JCExpression parseType() {
         return term(TYPE);
     }
     JCExpression term(int newmode) {
         int prevmode = mode;
         mode = newmode;
         JCExpression t = term();
         lastmode = mode;
         mode = prevmode;
         return t;
     }
     /**
      *  {@literal
      *  Expression = Expression1 [ExpressionRest]
      *  ExpressionRest = [AssignmentOperator Expression1]
      *  AssignmentOperator = "=" | "+=" | "-=" | "*=" | "/=" |
      *                       "&=" | "|=" | "^=" |
      *                       "%=" | "<<=" | ">>=" | ">>>="
      *  Type = Type1
      *  TypeNoParams = TypeNoParams1
      *  StatementExpression = Expression
      *  ConstantExpression = Expression
      *  }
      */
     JCExpression term() {
         JCExpression t = term1();
         if ((mode & EXPR) != 0 &&
             token.kind == EQ || PLUSEQ.compareTo(token.kind) <= 0 && token.kind.compareTo(GTGTGTEQ) <= 0)
             return termRest(t);
         else
             return t;
     }
     JCExpression termRest(JCExpression t) {
         switch (token.kind) {
         case EQ: {
             int pos = token.pos;
             nextToken();
             mode = EXPR;
             JCExpression t1 = term();
             return toP(F.at(pos).Assign(t, t1));
         }
         case PLUSEQ:
         case SUBEQ:
         case STAREQ:
         case SLASHEQ:
         case PERCENTEQ:
         case AMPEQ:
         case BAREQ:
         case CARETEQ:
         case LTLTEQ:
         case GTGTEQ:
         case GTGTGTEQ:
             int pos = token.pos;
             TokenKind tk = token.kind;
             nextToken();
             mode = EXPR;
             JCExpression t1 = term();
             return F.at(pos).Assignop(optag(tk), t, t1);
         default:
             return t;
         }
     }
     /** Expression1   = Expression2 [Expression1Rest]
      *  Type1         = Type2
      *  TypeNoParams1 = TypeNoParams2
      */
     JCExpression term1() {
         JCExpression t = term2();
         if ((mode & EXPR) != 0 && token.kind == QUES) {
             mode = EXPR;
             return term1Rest(t);
         } else {
             return t;
         }
     }
     /** Expression1Rest = ["?" Expression ":" Expression1]
      */
     JCExpression term1Rest(JCExpression t) {
         if (token.kind == QUES) {
             int pos = token.pos;
             nextToken();
             JCExpression t1 = term();
             accept(COLON);
             JCExpression t2 = term1();
             return F.at(pos).Conditional(t, t1, t2);
         } else {
             return t;
         }
     }
     /** Expression2   = Expression3 [Expression2Rest]
      *  Type2         = Type3
      *  TypeNoParams2 = TypeNoParams3
      */
     JCExpression term2() {
         JCExpression t = term3();
         if ((mode & EXPR) != 0 && prec(token.kind) >= TreeInfo.orPrec) {
             mode = EXPR;
             return term2Rest(t, TreeInfo.orPrec);
         } else {
             return t;
         }
     }
     /*  Expression2Rest = {infixop Expression3}
      *                  | Expression3 instanceof Type
      *  infixop         = "||"
      *                  | "&&"
      *                  | "|"
      *                  | "^"
      *                  | "&"
      *                  | "==" | "!="
      *                  | "<" | ">" | "<=" | ">="
      *                  | "<<" | ">>" | ">>>"
      *                  | "+" | "-"
      *                  | "*" | "/" | "%"
      */
     JCExpression term2Rest(JCExpression t, int minprec) {
         List<JCExpression[]> savedOd = odStackSupply.elems;
         JCExpression[] odStack = newOdStack();
         List<Token[]> savedOp = opStackSupply.elems;
         Token[] opStack = newOpStack();
         // optimization, was odStack = new Tree[...]; opStack = new Tree[...];
         int top = 0;
         odStack[0] = t;
         int startPos = token.pos;
         Token topOp = Tokens.DUMMY;
         while (prec(token.kind) >= minprec) {
             opStack[top] = topOp;
             top++;
             topOp = token;
             nextToken();
             odStack[top] = (topOp.kind == INSTANCEOF) ? parseType() : term3();
             while (top > 0 && prec(topOp.kind) >= prec(token.kind)) {
                 odStack[top-1] = makeOp(topOp.pos, topOp.kind, odStack[top-1],
                                         odStack[top]);
                 top--;
                 topOp = opStack[top];
             }
         }
         Assert.check(top == 0);
         t = odStack[0];
         if (t.hasTag(JCTree.Tag.PLUS)) {
             StringBuilder buf = foldStrings(t);
             if (buf != null) {
                 t = toP(F.at(startPos).Literal(TypeTag.CLASS, buf.toString()));
             }
         }
         odStackSupply.elems = savedOd; // optimization
         opStackSupply.elems = savedOp; // optimization
         return t;
     }
 //where
         /** Construct a binary or type test node.
          */
         private JCExpression makeOp(int pos,
                                     TokenKind topOp,
                                     JCExpression od1,
                                     JCExpression od2)
         {
             if (topOp == INSTANCEOF) {
                 return F.at(pos).TypeTest(od1, od2);
             } else {
                 return F.at(pos).Binary(optag(topOp), od1, od2);
             }
         }
         /** If tree is a concatenation of string literals, replace it
          *  by a single literal representing the concatenated string.
          */
         protected StringBuilder foldStrings(JCTree tree) {
             if (!allowStringFolding)
                 return null;
             List<String> buf = List.nil();
             while (true) {
                 if (tree.hasTag(LITERAL)) {
                     JCLiteral lit = (JCLiteral) tree;
                     if (lit.typetag == TypeTag.CLASS) {
                         StringBuilder sbuf =
                             new StringBuilder((String)lit.value);
                         while (buf.nonEmpty()) {
                             sbuf.append(buf.head);
                             buf = buf.tail;
                         }
                         return sbuf;
                     }
                 } else if (tree.hasTag(JCTree.Tag.PLUS)) {
                     JCBinary op = (JCBinary)tree;
                     if (op.rhs.hasTag(LITERAL)) {
                         JCLiteral lit = (JCLiteral) op.rhs;
                         if (lit.typetag == TypeTag.CLASS) {
                             buf = buf.prepend((String) lit.value);
                             tree = op.lhs;
                             continue;
                         }
                     }
                 }
                 return null;
             }
         }
         /** optimization: To save allocating a new operand/operator stack
          *  for every binary operation, we use supplys.
          */
         ListBuffer<JCExpression[]> odStackSupply = new ListBuffer<JCExpression[]>();
         ListBuffer<Token[]> opStackSupply = new ListBuffer<Token[]>();
         private JCExpression[] newOdStack() {
             if (odStackSupply.elems == odStackSupply.last)
                 odStackSupply.append(new JCExpression[infixPrecedenceLevels + 1]);
             JCExpression[] odStack = odStackSupply.elems.head;
             odStackSupply.elems = odStackSupply.elems.tail;
             return odStack;
         }
         private Token[] newOpStack() {
             if (opStackSupply.elems == opStackSupply.last)
                 opStackSupply.append(new Token[infixPrecedenceLevels + 1]);
             Token[] opStack = opStackSupply.elems.head;
             opStackSupply.elems = opStackSupply.elems.tail;
             return opStack;
         }
     /**
      *  Expression3    = PrefixOp Expression3
      *                 | "(" Expr | TypeNoParams ")" Expression3
      *                 | Primary {Selector} {PostfixOp}
      *
      *  {@literal
      *  Primary        = "(" Expression ")"
      *                 | Literal
      *                 | [TypeArguments] THIS [Arguments]
      *                 | [TypeArguments] SUPER SuperSuffix
      *                 | NEW [TypeArguments] Creator
      *                 | "(" Arguments ")" "->" ( Expression | Block )
      *                 | Ident "->" ( Expression | Block )
      *                 | Ident { "." Ident }
      *                 | Expression3 MemberReferenceSuffix
      *                   [ "[" ( "]" BracketsOpt "." CLASS | Expression "]" )
      *                   | Arguments
      *                   | "." ( CLASS | THIS | [TypeArguments] SUPER Arguments | NEW [TypeArguments] InnerCreator )
      *                   ]
      *                 | BasicType BracketsOpt "." CLASS
      *  }
      *
      *  PrefixOp       = "++" | "--" | "!" | "~" | "+" | "-"
      *  PostfixOp      = "++" | "--"
      *  Type3          = Ident { "." Ident } [TypeArguments] {TypeSelector} BracketsOpt
      *                 | BasicType
      *  TypeNoParams3  = Ident { "." Ident } BracketsOpt
      *  Selector       = "." [TypeArguments] Ident [Arguments]
      *                 | "." THIS
      *                 | "." [TypeArguments] SUPER SuperSuffix
      *                 | "." NEW [TypeArguments] InnerCreator
      *                 | "[" Expression "]"
      *  TypeSelector   = "." Ident [TypeArguments]
      *  SuperSuffix    = Arguments | "." Ident [Arguments]
      */
     protected JCExpression term3() {
         int pos = token.pos;
         JCExpression t;
         List<JCExpression> typeArgs = typeArgumentsOpt(EXPR);
         switch (token.kind) {
         case QUES:
             if ((mode & TYPE) != 0 && (mode & (TYPEARG|NOPARAMS)) == TYPEARG) {
                 mode = TYPE;
                 return typeArgument();
             } else
                 return illegal();
         case PLUSPLUS: case SUBSUB: case BANG: case TILDE: case PLUS: case SUB:
             if (typeArgs == null && (mode & EXPR) != 0) {
                 TokenKind tk = token.kind;
                 nextToken();
                 mode = EXPR;
                 if (tk == SUB &&
                     (token.kind == INTLITERAL || token.kind == LONGLITERAL) &&
                     token.radix() == 10) {
                     mode = EXPR;
                     t = literal(names.hyphen, pos);
                 } else {
                     t = term3();
                     return F.at(pos).Unary(unoptag(tk), t);
                 }
             } else return illegal();
             break;
         case LPAREN:
             if (typeArgs == null && (mode & EXPR) != 0) {
                 if (peekToken(MONKEYS_AT) ||
                         peekToken(FINAL) ||
                         peekToken(RPAREN) ||
                         peekToken(IDENTIFIER, COMMA) ||
                         peekToken(IDENTIFIER, RPAREN, ARROW)) {
                     //implicit n-ary lambda
                     t = lambdaExpressionOrStatement(true, peekToken(MONKEYS_AT) || peekToken(FINAL), pos);
                     break;
                 } else {
                     nextToken();
                     mode = EXPR | TYPE | NOPARAMS;
                     t = term3();
                     if ((mode & TYPE) != 0 && token.kind == LT) {
                         // Could be a cast to a parameterized type
                         JCTree.Tag op = JCTree.Tag.LT;
                         int pos1 = token.pos;
                         nextToken();
                         mode &= (EXPR | TYPE);
                         mode |= TYPEARG;
                         JCExpression t1 = term3();
                         if ((mode & TYPE) != 0 &&
                             (token.kind == COMMA || token.kind == GT)) {
                             mode = TYPE;
                             ListBuffer<JCExpression> args = new ListBuffer<JCExpression>();
                             args.append(t1);
                             while (token.kind == COMMA) {
                                 nextToken();
                                 args.append(typeArgument());
                             }
                             accept(GT);
                             t = toP(F.at(pos1).TypeApply(t, args.toList()));
                             checkGenerics();
                             mode = EXPR | TYPE; //could be a lambda or a method ref or a cast to a type
                             t = term3Rest(t, typeArgs);
                             if (token.kind == IDENTIFIER || token.kind == ELLIPSIS) {
                                 //explicit lambda (w/ generic type)
                                 mode = EXPR;
                                 JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
                                 if (token.kind == ELLIPSIS) {
                                     mods.flags = Flags.VARARGS;
                                     t = to(F.at(token.pos).TypeArray(t));
                                     nextToken();
                                 }
                                 t = lambdaExpressionOrStatement(variableDeclaratorId(mods, t), pos);
                                 break;
                             }
                         } else if ((mode & EXPR) != 0) {
                             mode = EXPR;
                             JCExpression e = term2Rest(t1, TreeInfo.shiftPrec);
                             t = F.at(pos1).Binary(op, t, e);
                             t = termRest(term1Rest(term2Rest(t, TreeInfo.orPrec)));
                         } else {
                             accept(GT);
                         }
                     } else if ((mode & TYPE) != 0 &&
                             (token.kind == IDENTIFIER || token.kind == ELLIPSIS)) {
                         //explicit lambda (w/ non-generic type)
                         mode = EXPR;
                         JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
                         if (token.kind == ELLIPSIS) {
                             mods.flags = Flags.VARARGS;
                             t = to(F.at(token.pos).TypeArray(t));
                             nextToken();
                         }
                         t = lambdaExpressionOrStatement(variableDeclaratorId(mods, t), pos);
                         break;
                     } else {
                         t = termRest(term1Rest(term2Rest(t, TreeInfo.orPrec)));
                     }
                 }
                 accept(RPAREN);
                 lastmode = mode;
                 mode = EXPR;
                 if ((lastmode & EXPR) == 0) {
                     JCExpression t1 = term3();
                     return F.at(pos).TypeCast(t, t1);
                 } else if ((lastmode & TYPE) != 0) {
                     switch (token.kind) {
                     /*case PLUSPLUS: case SUBSUB: */
                     case BANG: case TILDE:
                     case LPAREN: case THIS: case SUPER:
                     case INTLITERAL: case LONGLITERAL: case FLOATLITERAL:
                     case DOUBLELITERAL: case CHARLITERAL: case STRINGLITERAL:
                     case TRUE: case FALSE: case NULL:
                         case NEW: case IDENTIFIER: case ASSERT: case ENUM:
                     case BYTE: case SHORT: case CHAR: case INT:
                     case LONG: case FLOAT: case DOUBLE: case BOOLEAN: case VOID:
                         JCExpression t1 = term3();
                         return F.at(pos).TypeCast(t, t1);
                     }
                 }
             } else {
                 return illegal();
             }
             t = toP(F.at(pos).Parens(t));
             break;
         case THIS:
             if ((mode & EXPR) != 0) {
                 mode = EXPR;
                 t = to(F.at(pos).Ident(names._this));
                 nextToken();
                 if (typeArgs == null)
                     t = argumentsOpt(null, t);
                 else
                     t = arguments(typeArgs, t);
                 typeArgs = null;
             } else return illegal();
             break;
         case SUPER:
             if ((mode & EXPR) != 0) {
                 mode = EXPR;
                 t = to(F.at(pos).Ident(names._super));
                 t = superSuffix(typeArgs, t);
                 typeArgs = null;
             } else return illegal();
             break;
         case INTLITERAL: case LONGLITERAL: case FLOATLITERAL: case DOUBLELITERAL:
         case CHARLITERAL: case STRINGLITERAL:
         case TRUE: case FALSE: case NULL:
             if (typeArgs == null && (mode & EXPR) != 0) {
                 mode = EXPR;
                 t = literal(names.empty);
             } else return illegal();
             break;
         case NEW:
             if (typeArgs != null) return illegal();
             if ((mode & EXPR) != 0) {
                 mode = EXPR;
                 nextToken();
                 if (token.kind == LT) typeArgs = typeArguments(false);
                 t = creator(pos, typeArgs);
                 typeArgs = null;
             } else return illegal();
             break;
         case IDENTIFIER: case ASSERT: case ENUM:
             if (typeArgs != null) return illegal();
             if ((mode & EXPR) != 0 && peekToken(ARROW)) {
                 t = lambdaExpressionOrStatement(false, false, pos);
             } else {
                 t = toP(F.at(token.pos).Ident(ident()));
                 loop: while (true) {
                     pos = token.pos;
                     switch (token.kind) {
                     case LBRACKET:
                         nextToken();
                         if (token.kind == RBRACKET) {
                             nextToken();
                             t = bracketsOpt(t);
                             t = toP(F.at(pos).TypeArray(t));
                             t = bracketsSuffix(t);
                         } else {
                             if ((mode & EXPR) != 0) {
                                 mode = EXPR;
                                 JCExpression t1 = term();
                                 t = to(F.at(pos).Indexed(t, t1));
                             }
                             accept(RBRACKET);
                         }
                         break loop;
                     case LPAREN:
                         if ((mode & EXPR) != 0) {
                             mode = EXPR;
                             t = arguments(typeArgs, t);
                             typeArgs = null;
                         }
                         break loop;
                     case DOT:
                         nextToken();
                         int oldmode = mode;
                         mode &= ~NOPARAMS;
                         typeArgs = typeArgumentsOpt(EXPR);
                         mode = oldmode;
                         if ((mode & EXPR) != 0) {
                             switch (token.kind) {
                             case CLASS:
                                 if (typeArgs != null) return illegal();
                                 mode = EXPR;
                                 t = to(F.at(pos).Select(t, names._class));
                                 nextToken();
                                 break loop;
                             case THIS:
                                 if (typeArgs != null) return illegal();
                                 mode = EXPR;
                                 t = to(F.at(pos).Select(t, names._this));
                                 nextToken();
                                 break loop;
                             case SUPER:
                                 mode = EXPR;
                                 t = to(F.at(pos).Select(t, names._super));
                                 t = superSuffix(typeArgs, t);
                                 typeArgs = null;
                                 break loop;
                             case NEW:
                                 if (typeArgs != null) return illegal();
                                 mode = EXPR;
                                 int pos1 = token.pos;
                                 nextToken();
                                 if (token.kind == LT) typeArgs = typeArguments(false);
                                 t = innerCreator(pos1, typeArgs, t);
                                 typeArgs = null;
                                 break loop;
                             }
                         }
                         // typeArgs saved for next loop iteration.
                         t = toP(F.at(pos).Select(t, ident()));
                         break;
                     case LT:
                         if ((mode & TYPE) == 0 && isUnboundMemberRef()) {
                             //this is an unbound method reference whose qualifier
                             //is a generic type i.e. A<S>::m
                             int pos1 = token.pos;
                             accept(LT);
                             ListBuffer<JCExpression> args = new ListBuffer<JCExpression>();
                             args.append(typeArgument());
                             while (token.kind == COMMA) {
                                 nextToken();
                                 args.append(typeArgument());
                             }
                             accept(GT);
                             t = toP(F.at(pos1).TypeApply(t, args.toList()));
                             checkGenerics();
                             while (token.kind == DOT) {
                                 nextToken();
                                 mode = TYPE;
                                 t = toP(F.at(token.pos).Select(t, ident()));
                                 t = typeArgumentsOpt(t);
                             }
                             t = bracketsOpt(t);
                             if (token.kind != COLCOL) {
                                 //method reference expected here
                                 t = illegal();
                             }
                             mode = EXPR;
                             return term3Rest(t, typeArgs);
                         }
                         break loop;
                     default:
                         break loop;
                     }
                 }
             }
             if (typeArgs != null) illegal();
             t = typeArgumentsOpt(t);
             break;
         case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
         case DOUBLE: case BOOLEAN:
             if (typeArgs != null) illegal();
             t = bracketsSuffix(bracketsOpt(basicType()));
             break;
         case VOID:
             if (typeArgs != null) illegal();
             if ((mode & EXPR) != 0) {
                 nextToken();
                 if (token.kind == DOT) {
                     JCPrimitiveTypeTree ti = toP(F.at(pos).TypeIdent(TypeTag.VOID));
                     t = bracketsSuffix(ti);
                 } else {
                     return illegal(pos);
                 }
             } else {
                 // Support the corner case of myMethodHandle.<void>invoke() by passing
                 // a void type (like other primitive types) to the next phase.
                 // The error will be reported in Attr.attribTypes or Attr.visitApply.
                 JCPrimitiveTypeTree ti = to(F.at(pos).TypeIdent(TypeTag.VOID));
                 nextToken();
                 return ti;
                 //return illegal();
             }
             break;
         default:
             return illegal();
         }
         return term3Rest(t, typeArgs);
     }
     JCExpression term3Rest(JCExpression t, List<JCExpression> typeArgs) {
         if (typeArgs != null) illegal();
         while (true) {
             int pos1 = token.pos;
             if (token.kind == LBRACKET) {
                 nextToken();
                 if ((mode & TYPE) != 0) {
                     int oldmode = mode;
                     mode = TYPE;
                     if (token.kind == RBRACKET) {
                         nextToken();
                         t = bracketsOpt(t);
                         t = toP(F.at(pos1).TypeArray(t));
                         if (token.kind == COLCOL) {
                             mode = EXPR;
                             continue;
                         }
                         return t;
                     }
                     mode = oldmode;
                 }
                 if ((mode & EXPR) != 0) {
                     mode = EXPR;
                     JCExpression t1 = term();
                     t = to(F.at(pos1).Indexed(t, t1));
                 }
                 accept(RBRACKET);
             } else if (token.kind == DOT) {
                 nextToken();
                 typeArgs = typeArgumentsOpt(EXPR);
                 if (token.kind == SUPER && (mode & EXPR) != 0) {
                     mode = EXPR;
                     t = to(F.at(pos1).Select(t, names._super));
                     nextToken();
                     t = arguments(typeArgs, t);
                     typeArgs = null;
                 } else if (token.kind == NEW && (mode & EXPR) != 0) {
                     if (typeArgs != null) return illegal();
                     mode = EXPR;
                     int pos2 = token.pos;
                     nextToken();
                     if (token.kind == LT) typeArgs = typeArguments(false);
                     t = innerCreator(pos2, typeArgs, t);
                     typeArgs = null;
                 } else {
                     t = toP(F.at(pos1).Select(t, ident()));
                     t = argumentsOpt(typeArgs, typeArgumentsOpt(t));
                     typeArgs = null;
                 }
             } else if ((mode & EXPR) != 0 && token.kind == COLCOL) {
                 mode = EXPR;
                 if (typeArgs != null) return illegal();
                 accept(COLCOL);
                 t = memberReferenceSuffix(pos1, t);
             } else {
                 break;
             }
         }
         while ((token.kind == PLUSPLUS || token.kind == SUBSUB) && (mode & EXPR) != 0) {
             mode = EXPR;
             t = to(F.at(token.pos).Unary(
                   token.kind == PLUSPLUS ? POSTINC : POSTDEC, t));
             nextToken();
         }
         return toP(t);
     }
     /**
      * If we see an identifier followed by a '&lt;' it could be an unbound
      * method reference or a binary expression. To disambiguate, look for a
      * matching '&gt;' and see if the subsequent terminal is either '.' or '#'.
      */
     @SuppressWarnings("fallthrough")
     boolean isUnboundMemberRef() {
         int pos = 0, depth = 0;
         for (Token t = S.token(pos) ; ; t = S.token(++pos)) {
             switch (t.kind) {
                 case IDENTIFIER: case QUES: case EXTENDS: case SUPER:
                 case DOT: case RBRACKET: case LBRACKET: case COMMA:
                 case BYTE: case SHORT: case INT: case LONG: case FLOAT:
                 case DOUBLE: case BOOLEAN: case CHAR:
                     break;
                 case LT:
                     depth++; break;
                 case GTGTGT:
                     depth--;
                 case GTGT:
                     depth--;
                 case GT:
                     depth--;
                     if (depth == 0) {
                         TokenKind nextKind = S.token(pos + 1).kind;
                         return
                             nextKind == TokenKind.DOT ||
                             nextKind == TokenKind.LBRACKET ||
                             nextKind == TokenKind.COLCOL;
                     }
                     break;
                 default:
                     return false;
             }
         }
     }
     JCExpression lambdaExpressionOrStatement(JCVariableDecl firstParam, int pos) {
         ListBuffer<JCVariableDecl> params = new ListBuffer<JCVariableDecl>();
         params.append(firstParam);
         JCVariableDecl lastParam = firstParam;
         while ((lastParam.mods.flags & Flags.VARARGS) == 0 && token.kind == COMMA) {
             nextToken();
             params.append(lastParam = formalParameter());
         }
         accept(RPAREN);
         return lambdaExpressionOrStatementRest(params.toList(), pos);
     }
     JCExpression lambdaExpressionOrStatement(boolean hasParens, boolean explicitParams, int pos) {
         List<JCVariableDecl> params = explicitParams ?
                 formalParameters() :
                 implicitParameters(hasParens);
         return lambdaExpressionOrStatementRest(params, pos);
     }
     JCExpression lambdaExpressionOrStatementRest(List<JCVariableDecl> args, int pos) {
         checkLambda();
         accept(ARROW);
         return token.kind == LBRACE ?
             lambdaStatement(args, pos, pos) :
             lambdaExpression(args, pos);
     }
     JCExpression lambdaStatement(List<JCVariableDecl> args, int pos, int pos2) {
         JCBlock block = block(pos2, 0);
         return toP(F.at(pos).Lambda(args, block));
     }
     JCExpression lambdaExpression(List<JCVariableDecl> args, int pos) {
         JCTree expr = parseExpression();
         return toP(F.at(pos).Lambda(args, expr));
     }
     /** SuperSuffix = Arguments | "." [TypeArguments] Ident [Arguments]
      */
     JCExpression superSuffix(List<JCExpression> typeArgs, JCExpression t) {
         nextToken();
         if (token.kind == LPAREN || typeArgs != null) {
             t = arguments(typeArgs, t);
         } else if (token.kind == COLCOL) {
             if (typeArgs != null) return illegal();
             t = memberReferenceSuffix(t);
         } else {
             int pos = token.pos;
             accept(DOT);
             typeArgs = (token.kind == LT) ? typeArguments(false) : null;
             t = toP(F.at(pos).Select(t, ident()));
             t = argumentsOpt(typeArgs, t);
         }
         return t;
     }
     /** BasicType = BYTE | SHORT | CHAR | INT | LONG | FLOAT | DOUBLE | BOOLEAN
      */
     JCPrimitiveTypeTree basicType() {
         JCPrimitiveTypeTree t = to(F.at(token.pos).TypeIdent(typetag(token.kind)));
         nextToken();
         return t;
     }
     /** ArgumentsOpt = [ Arguments ]
      */
     JCExpression argumentsOpt(List<JCExpression> typeArgs, JCExpression t) {
         if ((mode & EXPR) != 0 && token.kind == LPAREN || typeArgs != null) {
             mode = EXPR;
             return arguments(typeArgs, t);
         } else {
             return t;
         }
     }
     /** Arguments = "(" [Expression { COMMA Expression }] ")"
      */
     List<JCExpression> arguments() {
         ListBuffer<JCExpression> args = lb();
         if (token.kind == LPAREN) {
             nextToken();
             if (token.kind != RPAREN) {
                 args.append(parseExpression());
                 while (token.kind == COMMA) {
                     nextToken();
                     args.append(parseExpression());
                 }
             }
             accept(RPAREN);
         } else {
             syntaxError(token.pos, "expected", LPAREN);
         }
         return args.toList();
     }
     JCMethodInvocation arguments(List<JCExpression> typeArgs, JCExpression t) {
         int pos = token.pos;
         List<JCExpression> args = arguments();
         return toP(F.at(pos).Apply(typeArgs, t, args));
     }
     /**  TypeArgumentsOpt = [ TypeArguments ]
      */
     JCExpression typeArgumentsOpt(JCExpression t) {
         if (token.kind == LT &&
             (mode & TYPE) != 0 &&
             (mode & NOPARAMS) == 0) {
             mode = TYPE;
             checkGenerics();
             return typeArguments(t, false);
         } else {
             return t;
         }
     }
     List<JCExpression> typeArgumentsOpt() {
         return typeArgumentsOpt(TYPE);
     }
     List<JCExpression> typeArgumentsOpt(int useMode) {
         if (token.kind == LT) {
             checkGenerics();
             if ((mode & useMode) == 0 ||
                 (mode & NOPARAMS) != 0) {
                 illegal();
             }
             mode = useMode;
             return typeArguments(false);
         }
         return null;
     }
     /**
      *  {@literal
      *  TypeArguments  = "<" TypeArgument {"," TypeArgument} ">"
      *  }
      */
     List<JCExpression> typeArguments(boolean diamondAllowed) {
         if (token.kind == LT) {
             nextToken();
             if (token.kind == GT && diamondAllowed) {
                 checkDiamond();
                 mode |= DIAMOND;
                 nextToken();
                 return List.nil();
             } else {
                 ListBuffer<JCExpression> args = ListBuffer.lb();
                 args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
                 while (token.kind == COMMA) {
                     nextToken();
                     args.append(((mode & EXPR) == 0) ? typeArgument() : parseType());
                 }
                 switch (token.kind) {
                 case GTGTGTEQ: case GTGTEQ: case GTEQ:
                 case GTGTGT: case GTGT:
                     token = S.split();
                     break;
                 case GT:
                     nextToken();
                     break;
                 default:
                     args.append(syntaxError(token.pos, "expected", GT));
                     break;
                 }
                 return args.toList();
             }
         } else {
             return List.<JCExpression>of(syntaxError(token.pos, "expected", LT));
         }
     }
     /**
      *  {@literal
      *  TypeArgument = Type
      *               | "?"
      *               | "?" EXTENDS Type {"&" Type}
      *               | "?" SUPER Type
      *  }
      */
     JCExpression typeArgument() {
         if (token.kind != QUES) return parseType();
         int pos = token.pos;
         nextToken();
         if (token.kind == EXTENDS) {
             TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.EXTENDS));
             nextToken();
             JCExpression bound = parseType();
             return F.at(pos).Wildcard(t, bound);
         } else if (token.kind == SUPER) {
             TypeBoundKind t = to(F.at(pos).TypeBoundKind(BoundKind.SUPER));
             nextToken();
             JCExpression bound = parseType();
             return F.at(pos).Wildcard(t, bound);
         } else if (token.kind == IDENTIFIER) {
             //error recovery
             TypeBoundKind t = F.at(Position.NOPOS).TypeBoundKind(BoundKind.UNBOUND);
             JCExpression wc = toP(F.at(pos).Wildcard(t, null));
             JCIdent id = toP(F.at(token.pos).Ident(ident()));
             JCErroneous err = F.at(pos).Erroneous(List.<JCTree>of(wc, id));
             reportSyntaxError(err, "expected3", GT, EXTENDS, SUPER);
             return err;
         } else {
             TypeBoundKind t = toP(F.at(pos).TypeBoundKind(BoundKind.UNBOUND));
             return toP(F.at(pos).Wildcard(t, null));
         }
     }
     JCTypeApply typeArguments(JCExpression t, boolean diamondAllowed) {
         int pos = token.pos;
         List<JCExpression> args = typeArguments(diamondAllowed);
         return toP(F.at(pos).TypeApply(t, args));
     }
     /** BracketsOpt = {"[" "]"}
      */
     private JCExpression bracketsOpt(JCExpression t) {
         if (token.kind == LBRACKET) {
             int pos = token.pos;
             nextToken();
             t = bracketsOptCont(t, pos);
             F.at(pos);
         }
         return t;
     }
     private JCArrayTypeTree bracketsOptCont(JCExpression t, int pos) {
         accept(RBRACKET);
         t = bracketsOpt(t);
         return toP(F.at(pos).TypeArray(t));
     }
     /** BracketsSuffixExpr = "." CLASS
      *  BracketsSuffixType =
      */
     JCExpression bracketsSuffix(JCExpression t) {
         if ((mode & EXPR) != 0 && token.kind == DOT) {
             mode = EXPR;
             int pos = token.pos;
             nextToken();
             accept(CLASS);
             if (token.pos == endPosTable.errorEndPos) {
                 // error recovery
                 Name name = null;
                 if (token.kind == IDENTIFIER) {
                     name = token.name();
                     nextToken();
                 } else {
                     name = names.error;
                 }
                 t = F.at(pos).Erroneous(List.<JCTree>of(toP(F.at(pos).Select(t, name))));
             } else {
                 t = toP(F.at(pos).Select(t, names._class));
             }
         } else if ((mode & TYPE) != 0) {
             if (token.kind != COLCOL) {
                 mode = TYPE;
             }
         } else if (token.kind != COLCOL) {
             syntaxError(token.pos, "dot.class.expected");
         }
         return t;
     }
     /**
      * MemberReferenceSuffix = "::" [TypeArguments] Ident
      *                       | "::" [TypeArguments] "new"
      */
     JCExpression memberReferenceSuffix(JCExpression t) {
         int pos1 = token.pos;
         accept(COLCOL);
         return memberReferenceSuffix(pos1, t);
     }
     JCExpression memberReferenceSuffix(int pos1, JCExpression t) {
         checkMethodReferences();
         mode = EXPR;
         List<JCExpression> typeArgs = null;
         if (token.kind == LT) {
             typeArgs = typeArguments(false);
         }
         Name refName = null;
         ReferenceMode refMode = null;
         if (token.kind == NEW) {
             refMode = ReferenceMode.NEW;
             refName = names.init;
             nextToken();
         } else {
             refMode = ReferenceMode.INVOKE;
             refName = ident();
         }
         return toP(F.at(t.getStartPosition()).Reference(refMode, refName, t, typeArgs));
     }
     /** Creator = Qualident [TypeArguments] ( ArrayCreatorRest | ClassCreatorRest )
      */
     JCExpression creator(int newpos, List<JCExpression> typeArgs) {
         switch (token.kind) {
         case BYTE: case SHORT: case CHAR: case INT: case LONG: case FLOAT:
         case DOUBLE: case BOOLEAN:
             if (typeArgs == null)
                 return arrayCreatorRest(newpos, basicType());
             break;
         default:
         }
         JCExpression t = qualident();
         int oldmode = mode;
         mode = TYPE;
         boolean diamondFound = false;
         int lastTypeargsPos = -1;
         if (token.kind == LT) {
             checkGenerics();
             lastTypeargsPos = token.pos;
             t = typeArguments(t, true);
             diamondFound = (mode & DIAMOND) != 0;
         }
         while (token.kind == DOT) {
             if (diamondFound) {
                 //cannot select after a diamond
                 illegal();
             }
             int pos = token.pos;
             nextToken();
             t = toP(F.at(pos).Select(t, ident()));
             if (token.kind == LT) {
                 lastTypeargsPos = token.pos;
                 checkGenerics();
                 t = typeArguments(t, true);
                 diamondFound = (mode & DIAMOND) != 0;
             }
         }
         mode = oldmode;
         if (token.kind == LBRACKET) {
             JCExpression e = arrayCreatorRest(newpos, t);
             if (diamondFound) {
                 reportSyntaxError(lastTypeargsPos, "cannot.create.array.with.diamond");
                 return toP(F.at(newpos).Erroneous(List.of(e)));
             }
             else if (typeArgs != null) {
                 int pos = newpos;
                 if (!typeArgs.isEmpty() && typeArgs.head.pos != Position.NOPOS) {
                     // note: this should always happen but we should
                     // not rely on this as the parser is continuously
                     // modified to improve error recovery.
                     pos = typeArgs.head.pos;
                 }
                 setErrorEndPos(S.prevToken().endPos);
                 JCErroneous err = F.at(pos).Erroneous(typeArgs.prepend(e));
                 reportSyntaxError(err, "cannot.create.array.with.type.arguments");
                 return toP(err);
             }
             return e;
         } else if (token.kind == LPAREN) {
             return classCreatorRest(newpos, null, typeArgs, t);
         } else {
             setErrorEndPos(token.pos);
             reportSyntaxError(token.pos, "expected2", LPAREN, LBRACKET);
             t = toP(F.at(newpos).NewClass(null, typeArgs, t, List.<JCExpression>nil(), null));
             return toP(F.at(newpos).Erroneous(List.<JCTree>of(t)));
         }
     }
     /** InnerCreator = Ident [TypeArguments] ClassCreatorRest
      */
     JCExpression innerCreator(int newpos, List<JCExpression> typeArgs, JCExpression encl) {
         JCExpression t = toP(F.at(token.pos).Ident(ident()));
         if (token.kind == LT) {
             int oldmode = mode;
             checkGenerics();
             t = typeArguments(t, true);
             mode = oldmode;
         }
         return classCreatorRest(newpos, encl, typeArgs, t);
     }
     /** ArrayCreatorRest = "[" ( "]" BracketsOpt ArrayInitializer
      *                         | Expression "]" {"[" Expression "]"} BracketsOpt )
      */
     JCExpression arrayCreatorRest(int newpos, JCExpression elemtype) {
         accept(LBRACKET);
         if (token.kind == RBRACKET) {
             accept(RBRACKET);
             elemtype = bracketsOpt(elemtype);
             if (token.kind == LBRACE) {
                 return arrayInitializer(newpos, elemtype);
             } else {
                 JCExpression t = toP(F.at(newpos).NewArray(elemtype, List.<JCExpression>nil(), null));
                 return syntaxError(token.pos, List.<JCTree>of(t), "array.dimension.missing");
             }
         } else {
             ListBuffer<JCExpression> dims = new ListBuffer<JCExpression>();
             dims.append(parseExpression());
             accept(RBRACKET);
             while (token.kind == LBRACKET) {
                 int pos = token.pos;
                 nextToken();
                 if (token.kind == RBRACKET) {
                     elemtype = bracketsOptCont(elemtype, pos);
                 } else {
                     dims.append(parseExpression());
                     accept(RBRACKET);
                 }
             }
             return toP(F.at(newpos).NewArray(elemtype, dims.toList(), null));
         }
     }
     /** ClassCreatorRest = Arguments [ClassBody]
      */
     JCNewClass classCreatorRest(int newpos,
                                   JCExpression encl,
                                   List<JCExpression> typeArgs,
                                   JCExpression t)
     {
         List<JCExpression> args = arguments();
         JCClassDecl body = null;
         if (token.kind == LBRACE) {
             int pos = token.pos;
             List<JCTree> defs = classOrInterfaceBody(names.empty, false);
             JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
             body = toP(F.at(pos).AnonymousClassDef(mods, defs));
         }
         return toP(F.at(newpos).NewClass(encl, typeArgs, t, args, body));
     }
     /** ArrayInitializer = "{" [VariableInitializer {"," VariableInitializer}] [","] "}"
      */
     JCExpression arrayInitializer(int newpos, JCExpression t) {
         accept(LBRACE);
         ListBuffer<JCExpression> elems = new ListBuffer<JCExpression>();
         if (token.kind == COMMA) {
             nextToken();
         } else if (token.kind != RBRACE) {
             elems.append(variableInitializer());
             while (token.kind == COMMA) {
                 nextToken();
                 if (token.kind == RBRACE) break;
                 elems.append(variableInitializer());
             }
         }
         accept(RBRACE);
         return toP(F.at(newpos).NewArray(t, List.<JCExpression>nil(), elems.toList()));
     }
     /** VariableInitializer = ArrayInitializer | Expression
      */
     public JCExpression variableInitializer() {
         return token.kind == LBRACE ? arrayInitializer(token.pos, null) : parseExpression();
     }
     /** ParExpression = "(" Expression ")"
      */
     JCExpression parExpression() {
         int pos = token.pos;
         accept(LPAREN);
         JCExpression t = parseExpression();
         accept(RPAREN);
         return toP(F.at(pos).Parens(t));
     }
     /** Block = "{" BlockStatements "}"
      */
     JCBlock block(int pos, long flags) {
         accept(LBRACE);
         List<JCStatement> stats = blockStatements();
         JCBlock t = F.at(pos).Block(flags, stats);
         while (token.kind == CASE || token.kind == DEFAULT) {
             syntaxError("orphaned", token.kind);
             switchBlockStatementGroups();
         }
         // the Block node has a field "endpos" for first char of last token, which is
         // usually but not necessarily the last char of the last token.
         t.endpos = token.pos;
         accept(RBRACE);
         return toP(t);
     }
     public JCBlock block() {
         return block(token.pos, 0);
     }
     /** BlockStatements = { BlockStatement }
      *  BlockStatement  = LocalVariableDeclarationStatement
      *                  | ClassOrInterfaceOrEnumDeclaration
      *                  | [Ident ":"] Statement
      *  LocalVariableDeclarationStatement
      *                  = { FINAL | '@' Annotation } Type VariableDeclarators ";"
      */
     @SuppressWarnings("fallthrough")
     List<JCStatement> blockStatements() {
         //todo: skip to anchor on error(?)
         ListBuffer<JCStatement> stats = new ListBuffer<JCStatement>();
         while (true) {
             List<JCStatement> stat = blockStatement();
             if (stat.isEmpty()) {
                 return stats.toList();
             } else {
                 if (token.pos <= endPosTable.errorEndPos) {
                     skip(false, true, true, true);
                 }
                 stats.addAll(stat);
             }
         }
     }
     /*
      * This method parses a statement treating it as a block, relaxing the
      * JLS restrictions, allows us to parse more faulty code, doing so
      * enables us to provide better and accurate diagnostics to the user.
      */
     JCStatement parseStatementAsBlock() {
         int pos = token.pos;
         List<JCStatement> stats = blockStatement();
         if (stats.isEmpty()) {
             JCErroneous e = F.at(pos).Erroneous();
             error(e, "illegal.start.of.stmt");
             return F.at(pos).Exec(e);
         } else {
             JCStatement first = stats.head;
             String error = null;
             switch (first.getTag()) {
             case CLASSDEF:
                 error = "class.not.allowed";
                 break;
             case VARDEF:
                 error = "variable.not.allowed";
                 break;
             }
             if (error != null) {
                 error(first, error);
                 List<JCBlock> blist = List.of(F.at(first.pos).Block(0, stats));
                 return toP(F.at(pos).Exec(F.at(first.pos).Erroneous(blist)));
             }
             return first;
         }
     }
     @SuppressWarnings("fallthrough")
     List<JCStatement> blockStatement() {
         //todo: skip to anchor on error(?)
         int pos = token.pos;
         switch (token.kind) {
         case RBRACE: case CASE: case DEFAULT: case EOF:
             return List.nil();
         case LBRACE: case IF: case FOR: case WHILE: case DO: case TRY:
         case SWITCH: case SYNCHRONIZED: case RETURN: case THROW: case BREAK:
         case CONTINUE: case SEMI: case ELSE: case FINALLY: case CATCH:
             return List.of(parseStatement());
         case MONKEYS_AT:
         case FINAL: {
             Comment dc = token.comment(CommentStyle.JAVADOC);
             JCModifiers mods = modifiersOpt();
             if (token.kind == INTERFACE ||
                 token.kind == CLASS ||
                 allowEnums && token.kind == ENUM) {
                 return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
             } else {
                 JCExpression t = parseType();
                 ListBuffer<JCStatement> stats =
                         variableDeclarators(mods, t, new ListBuffer<JCStatement>());
                 // A "LocalVariableDeclarationStatement" subsumes the terminating semicolon
                 storeEnd(stats.elems.last(), token.endPos);
                 accept(SEMI);
                 return stats.toList();
             }
         }
         case ABSTRACT: case STRICTFP: {
             Comment dc = token.comment(CommentStyle.JAVADOC);
             JCModifiers mods = modifiersOpt();
             return List.of(classOrInterfaceOrEnumDeclaration(mods, dc));
         }
         case INTERFACE:
         case CLASS:
             Comment dc = token.comment(CommentStyle.JAVADOC);
             return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
         case ENUM:
         case ASSERT:
             if (allowEnums && token.kind == ENUM) {
                 error(token.pos, "local.enum");
                 dc = token.comment(CommentStyle.JAVADOC);
                 return List.of(classOrInterfaceOrEnumDeclaration(modifiersOpt(), dc));
             } else if (allowAsserts && token.kind == ASSERT) {
                 return List.of(parseStatement());
             }
             /* fall through to default */
         default:
             Token prevToken = token;
             JCExpression t = term(EXPR | TYPE);
             if (token.kind == COLON && t.hasTag(IDENT)) {
                 nextToken();
                 JCStatement stat = parseStatement();
                 return List.<JCStatement>of(F.at(pos).Labelled(prevToken.name(), stat));
             } else if ((lastmode & TYPE) != 0 &&
                        (token.kind == IDENTIFIER ||
                         token.kind == ASSERT ||
                         token.kind == ENUM)) {
                 pos = token.pos;
                 JCModifiers mods = F.at(Position.NOPOS).Modifiers(0);
                 F.at(pos);
                 ListBuffer<JCStatement> stats =
                         variableDeclarators(mods, t, new ListBuffer<JCStatement>());
                 // A "LocalVariableDeclarationStatement" subsumes the terminating semicolon
                 storeEnd(stats.elems.last(), token.endPos);
                 accept(SEMI);
                 return stats.toList();
             } else {
                 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
                 JCExpressionStatement expr = to(F.at(pos).Exec(checkExprStat(t)));
                 accept(SEMI);
                 return List.<JCStatement>of(expr);
             }
         }
     }
     /** Statement =
      *       Block
      *     | IF ParExpression Statement [ELSE Statement]
      *     | FOR "(" ForInitOpt ";" [Expression] ";" ForUpdateOpt ")" Statement
      *     | FOR "(" FormalParameter : Expression ")" Statement
      *     | WHILE ParExpression Statement
      *     | DO Statement WHILE ParExpression ";"
      *     | TRY Block ( Catches | [Catches] FinallyPart )
      *     | TRY "(" ResourceSpecification ";"opt ")" Block [Catches] [FinallyPart]
      *     | SWITCH ParExpression "{" SwitchBlockStatementGroups "}"
      *     | SYNCHRONIZED ParExpression Block
      *     | RETURN [Expression] ";"
      *     | THROW Expression ";"
      *     | BREAK [Ident] ";"
      *     | CONTINUE [Ident] ";"
      *     | ASSERT Expression [ ":" Expression ] ";"
      *     | ";"
      *     | ExpressionStatement
      *     | Ident ":" Statement
      */
     @SuppressWarnings("fallthrough")
     public JCStatement parseStatement() {
         int pos = token.pos;
         switch (token.kind) {
         case LBRACE:
             return block();
         case IF: {
             nextToken();
             JCExpression cond = parExpression();
             JCStatement thenpart = parseStatementAsBlock();
             JCStatement elsepart = null;
             if (token.kind == ELSE) {
                 nextToken();
                 elsepart = parseStatementAsBlock();
             }
             return F.at(pos).If(cond, thenpart, elsepart);
         }
         case FOR: {
             nextToken();
             accept(LPAREN);
             List<JCStatement> inits = token.kind == SEMI ? List.<JCStatement>nil() : forInit();
             if (inits.length() == 1 &&
                 inits.head.hasTag(VARDEF) &&
                 ((JCVariableDecl) inits.head).init == null &&
                 token.kind == COLON) {
                 checkForeach();
                 JCVariableDecl var = (JCVariableDecl)inits.head;
                 accept(COLON);
                 JCExpression expr = parseExpression();
                 accept(RPAREN);
                 JCStatement body = parseStatementAsBlock();
                 return F.at(pos).ForeachLoop(var, expr, body);
             } else {
                 accept(SEMI);
                 JCExpression cond = token.kind == SEMI ? null : parseExpression();
                 accept(SEMI);
                 List<JCExpressionStatement> steps = token.kind == RPAREN ? List.<JCExpressionStatement>nil() : forUpdate();
                 accept(RPAREN);
                 JCStatement body = parseStatementAsBlock();
                 return F.at(pos).ForLoop(inits, cond, steps, body);
             }
         }
         case WHILE: {
             nextToken();
             JCExpression cond = parExpression();
             JCStatement body = parseStatementAsBlock();
             return F.at(pos).WhileLoop(cond, body);
         }
         case DO: {
             nextToken();
             JCStatement body = parseStatementAsBlock();
             accept(WHILE);
             JCExpression cond = parExpression();
             JCDoWhileLoop t = to(F.at(pos).DoLoop(body, cond));
             accept(SEMI);
             return t;
         }
         case TRY: {
             nextToken();
             List<JCTree> resources = List.<JCTree>nil();
             if (token.kind == LPAREN) {
                 checkTryWithResources();
                 nextToken();
                 resources = resources();
                 accept(RPAREN);
             }
             JCBlock body = block();
             ListBuffer<JCCatch> catchers = new ListBuffer<JCCatch>();
             JCBlock finalizer = null;
             if (token.kind == CATCH || token.kind == FINALLY) {
                 while (token.kind == CATCH) catchers.append(catchClause());
                 if (token.kind == FINALLY) {
                     nextToken();
                     finalizer = block();
                 }
             } else {
                 if (allowTWR) {
                     if (resources.isEmpty())
                         error(pos, "try.without.catch.finally.or.resource.decls");
                 } else
                     error(pos, "try.without.catch.or.finally");
             }
             return F.at(pos).Try(resources, body, catchers.toList(), finalizer);
         }
         case SWITCH: {
             nextToken();
             JCExpression selector = parExpression();
             accept(LBRACE);
             List<JCCase> cases = switchBlockStatementGroups();
             JCSwitch t = to(F.at(pos).Switch(selector, cases));
             accept(RBRACE);
             return t;
         }
         case SYNCHRONIZED: {
             nextToken();
             JCExpression lock = parExpression();
             JCBlock body = block();
             return F.at(pos).Synchronized(lock, body);
         }
         case RETURN: {
             nextToken();
             JCExpression result = token.kind == SEMI ? null : parseExpression();
             JCReturn t = to(F.at(pos).Return(result));
             accept(SEMI);
             return t;
         }
         case THROW: {
             nextToken();
             JCExpression exc = parseExpression();
             JCThrow t = to(F.at(pos).Throw(exc));
             accept(SEMI);
             return t;
         }
         case BREAK: {
             nextToken();
             Name label = (token.kind == IDENTIFIER || token.kind == ASSERT || token.kind == ENUM) ? ident() : null;
             JCBreak t = to(F.at(pos).Break(label));
             accept(SEMI);
             return t;
         }
         case CONTINUE: {
             nextToken();
             Name label = (token.kind == IDENTIFIER || token.kind == ASSERT || token.kind == ENUM) ? ident() : null;
             JCContinue t =  to(F.at(pos).Continue(label));
             accept(SEMI);
             return t;
         }
         case SEMI:
             nextToken();
             return toP(F.at(pos).Skip());
         case ELSE:
             return toP(F.Exec(syntaxError("else.without.if")));
         case FINALLY:
             return toP(F.Exec(syntaxError("finally.without.try")));
         case CATCH:
             return toP(F.Exec(syntaxError("catch.without.try")));
         case ASSERT: {
             if (allowAsserts && token.kind == ASSERT) {
                 nextToken();
                 JCExpression assertion = parseExpression();
                 JCExpression message = null;
                 if (token.kind == COLON) {
                     nextToken();
                     message = parseExpression();
                 }
                 JCAssert t = to(F.at(pos).Assert(assertion, message));
                 accept(SEMI);
                 return t;
             }
             /* else fall through to default case */
         }
         case ENUM:
         default:
             Token prevToken = token;
             JCExpression expr = parseExpression();
             if (token.kind == COLON && expr.hasTag(IDENT)) {
                 nextToken();
                 JCStatement stat = parseStatement();
                 return F.at(pos).Labelled(prevToken.name(), stat);
             } else {
                 // This Exec is an "ExpressionStatement"; it subsumes the terminating semicolon
                 JCExpressionStatement stat = to(F.at(pos).Exec(checkExprStat(expr)));
                 accept(SEMI);
                 return stat;
             }
         }
     }
     /** CatchClause     = CATCH "(" FormalParameter ")" Block
      */
     protected JCCatch catchClause() {
         int pos = token.pos;
         accept(CATCH);
         accept(LPAREN);
         JCModifiers mods = optFinal(Flags.PARAMETER);
         List<JCExpression> catchTypes = catchTypes();
         JCExpression paramType = catchTypes.size() > 1 ?
                 toP(F.at(catchTypes.head.getStartPosition()).TypeUnion(catchTypes)) :
                 catchTypes.head;
         JCVariableDecl formal = variableDeclaratorId(mods, paramType);
         accept(RPAREN);
         JCBlock body = block();
         return F.at(pos).Catch(formal, body);
     }
     List<JCExpression> catchTypes() {
         ListBuffer<JCExpression> catchTypes = ListBuffer.lb();
         catchTypes.add(parseType());
         while (token.kind == BAR) {
             checkMulticatch();
             nextToken();
             catchTypes.add(qualident());
         }
         return catchTypes.toList();
     }
     /** SwitchBlockStatementGroups = { SwitchBlockStatementGroup }
      *  SwitchBlockStatementGroup = SwitchLabel BlockStatements
      *  SwitchLabel = CASE ConstantExpression ":" | DEFAULT ":"
      */
     List<JCCase> switchBlockStatementGroups() {
         ListBuffer<JCCase> cases = new ListBuffer<JCCase>();
         while (true) {
             int pos = token.pos;
             switch (token.kind) {
             case CASE:
             case DEFAULT:
                 cases.append(switchBlockStatementGroup());
                 break;
             case RBRACE: case EOF:
                 return cases.toList();
             default:
                 nextToken(); // to ensure progress
                 syntaxError(pos, "expected3",
                     CASE, DEFAULT, RBRACE);
             }
         }
     }
     protected JCCase switchBlockStatementGroup() {
         int pos = token.pos;
         List<JCStatement> stats;
         JCCase c;
         switch (token.kind) {
         case CASE:
             nextToken();
             JCExpression pat = parseExpression();
             accept(COLON);
             stats = blockStatements();
             c = F.at(pos).Case(pat, stats);
             if (stats.isEmpty())
                 storeEnd(c, S.prevToken().endPos);
             return c;
         case DEFAULT:
             nextToken();
             accept(COLON);
             stats = blockStatements();
             c = F.at(pos).Case(null, stats);
             if (stats.isEmpty())
                 storeEnd(c, S.prevToken().endPos);
             return c;
         }
         throw new AssertionError("should not reach here");
     }
     /** MoreStatementExpressions = { COMMA StatementExpression }
      */
     <T extends ListBuffer<? super JCExpressionStatement>> T moreStatementExpressions(int pos,
                                                                     JCExpression first,
                                                                     T stats) {
         // This Exec is a "StatementExpression"; it subsumes no terminating token
         stats.append(toP(F.at(pos).Exec(checkExprStat(first))));
         while (token.kind == COMMA) {
             nextToken();
             pos = token.pos;
             JCExpression t = parseExpression();
             // This Exec is a "StatementExpression"; it subsumes no terminating token
             stats.append(toP(F.at(pos).Exec(checkExprStat(t))));
         }
         return stats;
     }
     /** ForInit = StatementExpression MoreStatementExpressions
      *           |  { FINAL | '@' Annotation } Type VariableDeclarators
      */
     List<JCStatement> forInit() {
         ListBuffer<JCStatement> stats = lb();
         int pos = token.pos;
         if (token.kind == FINAL || token.kind == MONKEYS_AT) {
             return variableDeclarators(optFinal(0), parseType(), stats).toList();
         } else {
             JCExpression t = term(EXPR | TYPE);
             if ((lastmode & TYPE) != 0 &&
                 (token.kind == IDENTIFIER || token.kind == ASSERT ||
                  token.kind == ENUM)) {
                 return variableDeclarators(modifiersOpt(), t, stats).toList();
             } else if ((lastmode & TYPE) != 0 && token.kind == COLON) {
                 error(pos, "bad.initializer", "for-loop");
                 return List.of((JCStatement)F.at(pos).VarDef(null, null, t, null));
             } else {
                 return moreStatementExpressions(pos, t, stats).toList();
             }
         }
     }
     /** ForUpdate = StatementExpression MoreStatementExpressions
      */
     List<JCExpressionStatement> forUpdate() {
         return moreStatementExpressions(token.pos,
                                         parseExpression(),
                                         new ListBuffer<JCExpressionStatement>()).toList();
     }
     /** AnnotationsOpt = { '@' Annotation }
      */
     List<JCAnnotation> annotationsOpt() {
         if (token.kind != MONKEYS_AT) return List.nil(); // optimization
         ListBuffer<JCAnnotation> buf = new ListBuffer<JCAnnotation>();
         while (token.kind == MONKEYS_AT) {
             int pos = token.pos;
             nextToken();
             buf.append(annotation(pos));
         }
         return buf.toList();
     }
     /** ModifiersOpt = { Modifier }
      *  Modifier = PUBLIC | PROTECTED | PRIVATE | STATIC | ABSTRACT | FINAL
      *           | NATIVE | SYNCHRONIZED | TRANSIENT | VOLATILE | "@"
      *           | "@" Annotation
      */
     JCModifiers modifiersOpt() {
         return modifiersOpt(null);
     }
     protected JCModifiers modifiersOpt(JCModifiers partial) {
         long flags;
         ListBuffer<JCAnnotation> annotations = new ListBuffer<JCAnnotation>();
         int pos;
         if (partial == null) {
             flags = 0;
             pos = token.pos;
         } else {
             flags = partial.flags;
             annotations.appendList(partial.annotations);
             pos = partial.pos;
         }
         if (token.deprecatedFlag()) {
             flags |= Flags.DEPRECATED;
         }
         int lastPos = Position.NOPOS;
     loop:
         while (true) {
             long flag;
             switch (token.kind) {
             case PRIVATE     : flag = Flags.PRIVATE; break;
             case PROTECTED   : flag = Flags.PROTECTED; break;
             case PUBLIC      : flag = Flags.PUBLIC; break;
             case STATIC      : flag = Flags.STATIC; break;
             case TRANSIENT   : flag = Flags.TRANSIENT; break;
             case FINAL       : flag = Flags.FINAL; break;
             case ABSTRACT    : flag = Flags.ABSTRACT; break;
             case NATIVE      : flag = Flags.NATIVE; break;
             case VOLATILE    : flag = Flags.VOLATILE; break;
             case SYNCHRONIZED: flag = Flags.SYNCHRONIZED; break;
             case STRICTFP    : flag = Flags.STRICTFP; break;
             case MONKEYS_AT  : flag = Flags.ANNOTATION; break;
             case DEFAULT     : checkDefaultMethods(); flag = Flags.DEFAULT; break;
             case ERROR       : flag = 0; nextToken(); break;
             default: break loop;
             }
             if ((flags & flag) != 0) error(token.pos, "repeated.modifier");
             lastPos = token.pos;
             nextToken();
             if (flag == Flags.ANNOTATION) {
                 checkAnnotations();
                 if (token.kind != INTERFACE) {
                     JCAnnotation ann = annotation(lastPos);
                     // if first modifier is an annotation, set pos to annotation's.
                     if (flags == 0 && annotations.isEmpty())
                         pos = ann.pos;
                     annotations.append(ann);
                     lastPos = ann.pos;
                     flag = 0;
                 }
             }
             flags |= flag;
         }
         switch (token.kind) {
         case ENUM: flags |= Flags.ENUM; break;
         case INTERFACE: flags |= Flags.INTERFACE; break;
         default: break;
         }
         /* A modifiers tree with no modifier tokens or annotations
          * has no text position. */
         if ((flags & (Flags.ModifierFlags | Flags.ANNOTATION)) == 0 && annotations.isEmpty())
             pos = Position.NOPOS;
         JCModifiers mods = F.at(pos).Modifiers(flags, annotations.toList());
         if (pos != Position.NOPOS)
             storeEnd(mods, S.prevToken().endPos);
         return mods;
     }
     /** Annotation              = "@" Qualident [ "(" AnnotationFieldValues ")" ]
      * @param pos position of "@" token
      */
     JCAnnotation annotation(int pos) {
         // accept(AT); // AT consumed by caller
         checkAnnotations();
         JCTree ident = qualident();
         List<JCExpression> fieldValues = annotationFieldValuesOpt();
         JCAnnotation ann = F.at(pos).Annotation(ident, fieldValues);
         storeEnd(ann, S.prevToken().endPos);
         return ann;
     }
     List<JCExpression> annotationFieldValuesOpt() {
         return (token.kind == LPAREN) ? annotationFieldValues() : List.<JCExpression>nil();
     }
     /** AnnotationFieldValues   = "(" [ AnnotationFieldValue { "," AnnotationFieldValue } ] ")" */
     List<JCExpression> annotationFieldValues() {
         accept(LPAREN);
         ListBuffer<JCExpression> buf = new ListBuffer<JCExpression>();
         if (token.kind != RPAREN) {
             buf.append(annotationFieldValue());
             while (token.kind == COMMA) {
                 nextToken();
                 buf.append(annotationFieldValue());
             }
         }
         accept(RPAREN);
         return buf.toList();
     }
     /** AnnotationFieldValue    = AnnotationValue
      *                          | Identifier "=" AnnotationValue
      */
     JCExpression annotationFieldValue() {
         if (token.kind == IDENTIFIER) {
             mode = EXPR;
             JCExpression t1 = term1();
             if (t1.hasTag(IDENT) && token.kind == EQ) {
                 int pos = token.pos;
                 accept(EQ);
                 JCExpression v = annotationValue();
                 return toP(F.at(pos).Assign(t1, v));
             } else {
                 return t1;
             }
         }
         return annotationValue();
     }
     /* AnnotationValue          = ConditionalExpression
      *                          | Annotation
      *                          | "{" [ AnnotationValue { "," AnnotationValue } ] [","] "}"
      */
     JCExpression annotationValue() {
         int pos;
         switch (token.kind) {
         case MONKEYS_AT:
             pos = token.pos;
             nextToken();
             return annotation(pos);
         case LBRACE:
             pos = token.pos;
             accept(LBRACE);
             ListBuffer<JCExpression> buf = new ListBuffer<JCExpression>();
             if (token.kind != RBRACE) {
                 buf.append(annotationValue());
                 while (token.kind == COMMA) {
                     nextToken();
                     if (token.kind == RBRACE) break;
                     buf.append(annotationValue());
                 }
             }
             accept(RBRACE);
             return toP(F.at(pos).NewArray(null, List.<JCExpression>nil(), buf.toList()));
         default:
             mode = EXPR;
             return term1();
         }
     }
     /** VariableDeclarators = VariableDeclarator { "," VariableDeclarator }
      */
     public <T extends ListBuffer<? super JCVariableDecl>> T variableDeclarators(JCModifiers mods,
                                                                          JCExpression type,
                                                                          T vdefs)
     {
         return variableDeclaratorsRest(token.pos, mods, type, ident(), false, null, vdefs);
     }
     /** VariableDeclaratorsRest = VariableDeclaratorRest { "," VariableDeclarator }
      *  ConstantDeclaratorsRest = ConstantDeclaratorRest { "," ConstantDeclarator }
      *
      *  @param reqInit  Is an initializer always required?
      *  @param dc       The documentation comment for the variable declarations, or null.
      */
     <T extends ListBuffer<? super JCVariableDecl>> T variableDeclaratorsRest(int pos,
                                                                      JCModifiers mods,
                                                                      JCExpression type,
                                                                      Name name,
                                                                      boolean reqInit,
                                                                      Comment dc,
                                                                      T vdefs)
     {
         vdefs.append(variableDeclaratorRest(pos, mods, type, name, reqInit, dc));
         while (token.kind == COMMA) {
             // All but last of multiple declarators subsume a comma
             storeEnd((JCTree)vdefs.elems.last(), token.endPos);
             nextToken();
             vdefs.append(variableDeclarator(mods, type, reqInit, dc));
         }
         return vdefs;
     }
     /** VariableDeclarator = Ident VariableDeclaratorRest
      *  ConstantDeclarator = Ident ConstantDeclaratorRest
      */
     JCVariableDecl variableDeclarator(JCModifiers mods, JCExpression type, boolean reqInit, Comment dc) {
         return variableDeclaratorRest(token.pos, mods, type, ident(), reqInit, dc);
     }
     /** VariableDeclaratorRest = BracketsOpt ["=" VariableInitializer]
      *  ConstantDeclaratorRest = BracketsOpt "=" VariableInitializer
      *
      *  @param reqInit  Is an initializer always required?
      *  @param dc       The documentation comment for the variable declarations, or null.
      */
     JCVariableDecl variableDeclaratorRest(int pos, JCModifiers mods, JCExpression type, Name name,
                                   boolean reqInit, Comment dc) {
         type = bracketsOpt(type);
         JCExpression init = null;
         if (token.kind == EQ) {
             nextToken();
             init = variableInitializer();
         }
         else if (reqInit) syntaxError(token.pos, "expected", EQ);
         JCVariableDecl result =
             toP(F.at(pos).VarDef(mods, name, type, init));
         attach(result, dc);
         return result;
     }
     /** VariableDeclaratorId = Ident BracketsOpt
      */
     JCVariableDecl variableDeclaratorId(JCModifiers mods, JCExpression type) {
         int pos = token.pos;
         Name name = ident();
         if ((mods.flags & Flags.VARARGS) != 0 &&
                 token.kind == LBRACKET) {
             log.error(token.pos, "varargs.and.old.array.syntax");
         }
         type = bracketsOpt(type);
         return toP(F.at(pos).VarDef(mods, name, type, null));
     }
     /** Resources = Resource { ";" Resources }
      */
     List<JCTree> resources() {
         ListBuffer<JCTree> defs = new ListBuffer<JCTree>();
         defs.append(resource());
         while (token.kind == SEMI) {
             // All but last of multiple declarators must subsume a semicolon
             storeEnd(defs.elems.last(), token.endPos);
             int semiColonPos = token.pos;
             nextToken();
             if (token.kind == RPAREN) { // Optional trailing semicolon
                                        // after last resource
                 break;
             }
             defs.append(resource());
         }
         return defs.toList();
     }
     /** Resource = VariableModifiersOpt Type VariableDeclaratorId = Expression
      */
     protected JCTree resource() {
         JCModifiers optFinal = optFinal(Flags.FINAL);
         JCExpression type = parseType();
         int pos = token.pos;
         Name ident = ident();
         return variableDeclaratorRest(pos, optFinal, type, ident, true, null);
     }
     /** CompilationUnit = [ { "@" Annotation } PACKAGE Qualident ";"] {ImportDeclaration} {TypeDeclaration}
      */
     public JCTree.JCCompilationUnit parseCompilationUnit() {
         Token firstToken = token;
         JCExpression pid = null;
         JCModifiers mods = null;
         boolean consumedToplevelDoc = false;
         boolean seenImport = false;
         boolean seenPackage = false;
         List<JCAnnotation> packageAnnotations = List.nil();
         if (token.kind == MONKEYS_AT)
             mods = modifiersOpt();
         if (token.kind == PACKAGE) {
             seenPackage = true;
             if (mods != null) {
                 checkNoMods(mods.flags);
                 packageAnnotations = mods.annotations;
                 mods = null;
             }
             nextToken();
             pid = qualident();
             accept(SEMI);
         }
         ListBuffer<JCTree> defs = new ListBuffer<JCTree>();
         boolean checkForImports = true;
         boolean firstTypeDecl = true;
         while (token.kind != EOF) {
             if (token.pos <= endPosTable.errorEndPos) {
                 // error recovery
                 skip(checkForImports, false, false, false);
                 if (token.kind == EOF)
                     break;
             }
             if (checkForImports && mods == null && token.kind == IMPORT) {
                 seenImport = true;
                 defs.append(importDeclaration());
             } else {
                 Comment docComment = token.comment(CommentStyle.JAVADOC);
                 if (firstTypeDecl && !seenImport && !seenPackage) {
                     docComment = firstToken.comment(CommentStyle.JAVADOC);
                     consumedToplevelDoc = true;
                 }
                 JCTree def = typeDeclaration(mods, docComment);
                 if (def instanceof JCExpressionStatement)
                     def = ((JCExpressionStatement)def).expr;
                 defs.append(def);
                 if (def instanceof JCClassDecl)
                     checkForImports = false;
                 mods = null;
                 firstTypeDecl = false;
             }
         }
         JCTree.JCCompilationUnit toplevel = F.at(firstToken.pos).TopLevel(packageAnnotations, pid, defs.toList());
         if (!consumedToplevelDoc)
             attach(toplevel, firstToken.comment(CommentStyle.JAVADOC));
         if (defs.elems.isEmpty())
             storeEnd(toplevel, S.prevToken().endPos);
         if (keepDocComments)
             toplevel.docComments = docComments;
         if (keepLineMap)
             toplevel.lineMap = S.getLineMap();
         toplevel.endPositions = this.endPosTable;
         return toplevel;
     }
     /** ImportDeclaration = IMPORT [ STATIC ] Ident { "." Ident } [ "." "*" ] ";"
      */
     JCTree importDeclaration() {
         int pos = token.pos;
         nextToken();
         boolean importStatic = false;
         if (token.kind == STATIC) {
             checkStaticImports();
             importStatic = true;
             nextToken();
         }
         JCExpression pid = toP(F.at(token.pos).Ident(ident()));
         do {
             int pos1 = token.pos;
             accept(DOT);
             if (token.kind == STAR) {
                 pid = to(F.at(pos1).Select(pid, names.asterisk));
                 nextToken();
                 break;
             } else {
                 pid = toP(F.at(pos1).Select(pid, ident()));
             }
         } while (token.kind == DOT);
         accept(SEMI);
         return toP(F.at(pos).Import(pid, importStatic));
     }
     /** TypeDeclaration = ClassOrInterfaceOrEnumDeclaration
      *                  | ";"
      */
     JCTree typeDeclaration(JCModifiers mods, Comment docComment) {
         int pos = token.pos;
         if (mods == null && token.kind == SEMI) {
             nextToken();
             return toP(F.at(pos).Skip());
         } else {
             return classOrInterfaceOrEnumDeclaration(modifiersOpt(mods), docComment);
         }
     }
     /** ClassOrInterfaceOrEnumDeclaration = ModifiersOpt
      *           (ClassDeclaration | InterfaceDeclaration | EnumDeclaration)
      *  @param mods     Any modifiers starting the class or interface declaration
      *  @param dc       The documentation comment for the class, or null.
      */
     JCStatement classOrInterfaceOrEnumDeclaration(JCModifiers mods, Comment dc) {
         if (token.kind == CLASS) {
             return classDeclaration(mods, dc);
         } else if (token.kind == INTERFACE) {
             return interfaceDeclaration(mods, dc);
         } else if (allowEnums) {
             if (token.kind == ENUM) {
                 return enumDeclaration(mods, dc);
             } else {
                 int pos = token.pos;
                 List<JCTree> errs;
                 if (token.kind == IDENTIFIER) {
                     errs = List.<JCTree>of(mods, toP(F.at(pos).Ident(ident())));
                     setErrorEndPos(token.pos);
                 } else {
                     errs = List.<JCTree>of(mods);
                 }
                 return toP(F.Exec(syntaxError(pos, errs, "expected3",
                                               CLASS, INTERFACE, ENUM)));
             }
         } else {
             if (token.kind == ENUM) {
                 error(token.pos, "enums.not.supported.in.source", source.name);
                 allowEnums = true;
                 return enumDeclaration(mods, dc);
             }
             int pos = token.pos;
             List<JCTree> errs;
             if (token.kind == IDENTIFIER) {
                 errs = List.<JCTree>of(mods, toP(F.at(pos).Ident(ident())));
                 setErrorEndPos(token.pos);
             } else {
                 errs = List.<JCTree>of(mods);
             }
             return toP(F.Exec(syntaxError(pos, errs, "expected2",
                                           CLASS, INTERFACE)));
         }
     }
     /** ClassDeclaration = CLASS Ident TypeParametersOpt [EXTENDS Type]
      *                     [IMPLEMENTS TypeList] ClassBody
      *  @param mods    The modifiers starting the class declaration
      *  @param dc       The documentation comment for the class, or null.
      */
     protected JCClassDecl classDeclaration(JCModifiers mods, Comment dc) {
         int pos = token.pos;
         accept(CLASS);
         Name name = ident();
         List<JCTypeParameter> typarams = typeParametersOpt();
         JCExpression extending = null;
         if (token.kind == EXTENDS) {
             nextToken();
             extending = parseType();
         }
         List<JCExpression> implementing = List.nil();
         if (token.kind == IMPLEMENTS) {
             nextToken();
             implementing = typeList();
         }
         List<JCTree> defs = classOrInterfaceBody(name, false);
         JCClassDecl result = toP(F.at(pos).ClassDef(
             mods, name, typarams, extending, implementing, defs));
         attach(result, dc);
         return result;
     }
     /** InterfaceDeclaration = INTERFACE Ident TypeParametersOpt
      *                         [EXTENDS TypeList] InterfaceBody
      *  @param mods    The modifiers starting the interface declaration
      *  @param dc       The documentation comment for the interface, or null.
      */
     protected JCClassDecl interfaceDeclaration(JCModifiers mods, Comment dc) {
         int pos = token.pos;
         accept(INTERFACE);
         Name name = ident();
         List<JCTypeParameter> typarams = typeParametersOpt();
         List<JCExpression> extending = List.nil();
         if (token.kind == EXTENDS) {
             nextToken();
             extending = typeList();
         }
         List<JCTree> defs = classOrInterfaceBody(name, true);
         JCClassDecl result = toP(F.at(pos).ClassDef(
             mods, name, typarams, null, extending, defs));
         attach(result, dc);
         return result;
     }
     /** EnumDeclaration = ENUM Ident [IMPLEMENTS TypeList] EnumBody
      *  @param mods    The modifiers starting the enum declaration
      *  @param dc       The documentation comment for the enum, or null.
      */
     protected JCClassDecl enumDeclaration(JCModifiers mods, Comment dc) {
         int pos = token.pos;
         accept(ENUM);
         Name name = ident();
         List<JCExpression> implementing = List.nil();
         if (token.kind == IMPLEMENTS) {
             nextToken();
             implementing = typeList();
         }
         List<JCTree> defs = enumBody(name);
         mods.flags |= Flags.ENUM;
         JCClassDecl result = toP(F.at(pos).
             ClassDef(mods, name, List.<JCTypeParameter>nil(),
                 null, implementing, defs));
         attach(result, dc);
         return result;
     }
     /** EnumBody = "{" { EnumeratorDeclarationList } [","]
      *                  [ ";" {ClassBodyDeclaration} ] "}"
      */
     List<JCTree> enumBody(Name enumName) {
         accept(LBRACE);
         ListBuffer<JCTree> defs = new ListBuffer<JCTree>();
         if (token.kind == COMMA) {
             nextToken();
         } else if (token.kind != RBRACE && token.kind != SEMI) {
             defs.append(enumeratorDeclaration(enumName));
             while (token.kind == COMMA) {
                 nextToken();
                 if (token.kind == RBRACE || token.kind == SEMI) break;
                 defs.append(enumeratorDeclaration(enumName));
             }
             if (token.kind != SEMI && token.kind != RBRACE) {
                 defs.append(syntaxError(token.pos, "expected3",
                                 COMMA, RBRACE, SEMI));
                 nextToken();
             }
         }
         if (token.kind == SEMI) {
             nextToken();
             while (token.kind != RBRACE && token.kind != EOF) {
                 defs.appendList(classOrInterfaceBodyDeclaration(enumName,
                                                                 false));
                 if (token.pos <= endPosTable.errorEndPos) {
                     // error recovery
                    skip(false, true, true, false);
                 }
             }
         }
         accept(RBRACE);
         return defs.toList();
     }
     /** EnumeratorDeclaration = AnnotationsOpt [TypeArguments] IDENTIFIER [ Arguments ] [ "{" ClassBody "}" ]
      */
     JCTree enumeratorDeclaration(Name enumName) {
         Comment dc = token.comment(CommentStyle.JAVADOC);
         int flags = Flags.PUBLIC|Flags.STATIC|Flags.FINAL|Flags.ENUM;
         if (token.deprecatedFlag()) {
             flags |= Flags.DEPRECATED;
         }
         int pos = token.pos;
         List<JCAnnotation> annotations = annotationsOpt();
         JCModifiers mods = F.at(annotations.isEmpty() ? Position.NOPOS : pos).Modifiers(flags, annotations);
         List<JCExpression> typeArgs = typeArgumentsOpt();
         int identPos = token.pos;
         Name name = ident();
         int createPos = token.pos;
         List<JCExpression> args = (token.kind == LPAREN)
             ? arguments() : List.<JCExpression>nil();
         JCClassDecl body = null;
         if (token.kind == LBRACE) {
             JCModifiers mods1 = F.at(Position.NOPOS).Modifiers(Flags.ENUM | Flags.STATIC);
             List<JCTree> defs = classOrInterfaceBody(names.empty, false);
             body = toP(F.at(identPos).AnonymousClassDef(mods1, defs));
         }
         if (args.isEmpty() && body == null)
             createPos = identPos;
         JCIdent ident = F.at(identPos).Ident(enumName);
         JCNewClass create = F.at(createPos).NewClass(null, typeArgs, ident, args, body);
         if (createPos != identPos)
             storeEnd(create, S.prevToken().endPos);
         ident = F.at(identPos).Ident(enumName);
         JCTree result = toP(F.at(pos).VarDef(mods, name, ident, create));
         attach(result, dc);
         return result;
     }
     /** TypeList = Type {"," Type}
      */
     List<JCExpression> typeList() {
         ListBuffer<JCExpression> ts = new ListBuffer<JCExpression>();
         ts.append(parseType());
         while (token.kind == COMMA) {
             nextToken();
             ts.append(parseType());
         }
         return ts.toList();
     }
     /** ClassBody     = "{" {ClassBodyDeclaration} "}"
      *  InterfaceBody = "{" {InterfaceBodyDeclaration} "}"
      */
     List<JCTree> classOrInterfaceBody(Name className, boolean isInterface) {
         accept(LBRACE);
         if (token.pos <= endPosTable.errorEndPos) {
             // error recovery
             skip(false, true, false, false);
             if (token.kind == LBRACE)
                 nextToken();
         }
         ListBuffer<JCTree> defs = new ListBuffer<JCTree>();
         while (token.kind != RBRACE && token.kind != EOF) {
             defs.appendList(classOrInterfaceBodyDeclaration(className, isInterface));
             if (token.pos <= endPosTable.errorEndPos) {
                // error recovery
                skip(false, true, true, false);
            }
         }
         accept(RBRACE);
         return defs.toList();
     }
     /** ClassBodyDeclaration =
      *      ";"
      *    | [STATIC] Block
      *    | ModifiersOpt
      *      ( Type Ident
      *        ( VariableDeclaratorsRest ";" | MethodDeclaratorRest )
      *      | VOID Ident MethodDeclaratorRest
      *      | TypeParameters (Type | VOID) Ident MethodDeclaratorRest
      *      | Ident ConstructorDeclaratorRest
      *      | TypeParameters Ident ConstructorDeclaratorRest
      *      | ClassOrInterfaceOrEnumDeclaration
      *      )
      *  InterfaceBodyDeclaration =
      *      ";"
      *    | ModifiersOpt Type Ident
      *      ( ConstantDeclaratorsRest | InterfaceMethodDeclaratorRest ";" )
      */
     protected List<JCTree> classOrInterfaceBodyDeclaration(Name className, boolean isInterface) {
         if (token.kind == SEMI) {
             nextToken();
             return List.<JCTree>nil();
         } else {
             Comment dc = token.comment(CommentStyle.JAVADOC);
             int pos = token.pos;
             JCModifiers mods = modifiersOpt();
             if (token.kind == CLASS ||
                 token.kind == INTERFACE ||
                 allowEnums && token.kind == ENUM) {
                 return List.<JCTree>of(classOrInterfaceOrEnumDeclaration(mods, dc));
             } else if (token.kind == LBRACE && !isInterface &&
                        (mods.flags & Flags.StandardFlags & ~Flags.STATIC) == 0 &&
                        mods.annotations.isEmpty()) {
                 return List.<JCTree>of(block(pos, mods.flags));
             } else {
                 pos = token.pos;
                 List<JCTypeParameter> typarams = typeParametersOpt();
                 // if there are type parameters but no modifiers, save the start
                 // position of the method in the modifiers.
                 if (typarams.nonEmpty() && mods.pos == Position.NOPOS) {
                     mods.pos = pos;
                     storeEnd(mods, pos);
                 }
                 Token tk = token;
                 pos = token.pos;
                 JCExpression type;
                 boolean isVoid = token.kind == VOID;
                 if (isVoid) {
                     type = to(F.at(pos).TypeIdent(TypeTag.VOID));
                     nextToken();
                 } else {
                     type = parseType();
                 }
                 if (token.kind == LPAREN && !isInterface && type.hasTag(IDENT)) {
                     if (isInterface || tk.name() != className)
                         error(pos, "invalid.meth.decl.ret.type.req");
                     return List.of(methodDeclaratorRest(
                         pos, mods, null, names.init, typarams,
                         isInterface, true, dc));
                 } else {
                     pos = token.pos;
                     Name name = ident();
                     if (token.kind == LPAREN) {
                         return List.of(methodDeclaratorRest(
                             pos, mods, type, name, typarams,
                             isInterface, isVoid, dc));
                     } else if (!isVoid && typarams.isEmpty()) {
                         List<JCTree> defs =
                             variableDeclaratorsRest(pos, mods, type, name, isInterface, dc,
                                                     new ListBuffer<JCTree>()).toList();
                         storeEnd(defs.last(), token.endPos);
                         accept(SEMI);
                         return defs;
                     } else {
                         pos = token.pos;
                         List<JCTree> err = isVoid
                             ? List.<JCTree>of(toP(F.at(pos).MethodDef(mods, name, type, typarams,
                                 List.<JCVariableDecl>nil(), List.<JCExpression>nil(), null, null)))
                             : null;
                         return List.<JCTree>of(syntaxError(token.pos, err, "expected", LPAREN));
                     }
                 }
             }
         }
     }
     /** MethodDeclaratorRest =
      *      FormalParameters BracketsOpt [Throws TypeList] ( MethodBody | [DEFAULT AnnotationValue] ";")
      *  VoidMethodDeclaratorRest =
      *      FormalParameters [Throws TypeList] ( MethodBody | ";")
      *  InterfaceMethodDeclaratorRest =
      *      FormalParameters BracketsOpt [THROWS TypeList] ";"
      *  VoidInterfaceMethodDeclaratorRest =
      *      FormalParameters [THROWS TypeList] ";"
      *  ConstructorDeclaratorRest =
      *      "(" FormalParameterListOpt ")" [THROWS TypeList] MethodBody
      */
     protected JCTree methodDeclaratorRest(int pos,
                               JCModifiers mods,
                               JCExpression type,
                               Name name,
                               List<JCTypeParameter> typarams,
                               boolean isInterface, boolean isVoid,
                               Comment dc) {
         List<JCVariableDecl> params = formalParameters();
         if (!isVoid) type = bracketsOpt(type);
         List<JCExpression> thrown = List.nil();
         if (token.kind == THROWS) {
             nextToken();
             thrown = qualidentList();
         }
         JCBlock body = null;
         JCExpression defaultValue;
         if (token.kind == LBRACE) {
             body = block();
             defaultValue = null;
         } else {
             if (token.kind == DEFAULT) {
                 accept(DEFAULT);
                 defaultValue = annotationValue();
             } else {
                 defaultValue = null;
             }
             accept(SEMI);
             if (token.pos <= endPosTable.errorEndPos) {
                 // error recovery
                 skip(false, true, false, false);
                 if (token.kind == LBRACE) {
                     body = block();
                 }
             }
         }
         JCMethodDecl result =
             toP(F.at(pos).MethodDef(mods, name, type, typarams,
                                     params, thrown,
                                     body, defaultValue));
         attach(result, dc);
         return result;
     }
     /** QualidentList = Qualident {"," Qualident}
      */
     List<JCExpression> qualidentList() {
         ListBuffer<JCExpression> ts = new ListBuffer<JCExpression>();
         ts.append(qualident());
         while (token.kind == COMMA) {
             nextToken();
             ts.append(qualident());
         }
         return ts.toList();
     }
     /**
      *  {@literal
      *  TypeParametersOpt = ["<" TypeParameter {"," TypeParameter} ">"]
      *  }
      */
     List<JCTypeParameter> typeParametersOpt() {
         if (token.kind == LT) {
             checkGenerics();
             ListBuffer<JCTypeParameter> typarams = new ListBuffer<JCTypeParameter>();
             nextToken();
             typarams.append(typeParameter());
             while (token.kind == COMMA) {
                 nextToken();
                 typarams.append(typeParameter());
             }
             accept(GT);
             return typarams.toList();
         } else {
             return List.nil();
         }
     }
     /**
      *  {@literal
      *  TypeParameter = TypeVariable [TypeParameterBound]
      *  TypeParameterBound = EXTENDS Type {"&" Type}
      *  TypeVariable = Ident
      *  }
      */
     JCTypeParameter typeParameter() {
         int pos = token.pos;
         Name name = ident();
         ListBuffer<JCExpression> bounds = new ListBuffer<JCExpression>();
         if (token.kind == EXTENDS) {
             nextToken();
             bounds.append(parseType());
             while (token.kind == AMP) {
                 nextToken();
                 bounds.append(parseType());
             }
         }
         return toP(F.at(pos).TypeParameter(name, bounds.toList()));
     }
     /** FormalParameters = "(" [ FormalParameterList ] ")"
      *  FormalParameterList = [ FormalParameterListNovarargs , ] LastFormalParameter
      *  FormalParameterListNovarargs = [ FormalParameterListNovarargs , ] FormalParameter
      */
     List<JCVariableDecl> formalParameters() {
         ListBuffer<JCVariableDecl> params = new ListBuffer<JCVariableDecl>();
         JCVariableDecl lastParam = null;
         accept(LPAREN);
         if (token.kind != RPAREN) {
             params.append(lastParam = formalParameter());
             while ((lastParam.mods.flags & Flags.VARARGS) == 0 && token.kind == COMMA) {
                 nextToken();
                 params.append(lastParam = formalParameter());
             }
         }
         accept(RPAREN);
         return params.toList();
     }
     List<JCVariableDecl> implicitParameters(boolean hasParens) {
         if (hasParens) {
             accept(LPAREN);
         }
         ListBuffer<JCVariableDecl> params = new ListBuffer<JCVariableDecl>();
         if (token.kind != RPAREN && token.kind != ARROW) {
             params.append(implicitParameter());
             while (token.kind == COMMA) {
                 nextToken();
                 params.append(implicitParameter());
             }
         }
         if (hasParens) {
             accept(RPAREN);
         }
         return params.toList();
     }
     JCModifiers optFinal(long flags) {
         JCModifiers mods = modifiersOpt();
         checkNoMods(mods.flags & ~(Flags.FINAL | Flags.DEPRECATED));
         mods.flags |= flags;
         return mods;
     }
     /** FormalParameter = { FINAL | '@' Annotation } Type VariableDeclaratorId
      *  LastFormalParameter = { FINAL | '@' Annotation } Type '...' Ident | FormalParameter
      */
     protected JCVariableDecl formalParameter() {
         JCModifiers mods = optFinal(Flags.PARAMETER);
         JCExpression type = parseType();
         if (token.kind == ELLIPSIS) {
             checkVarargs();
             mods.flags |= Flags.VARARGS;
             type = to(F.at(token.pos).TypeArray(type));
             nextToken();
         }
         return variableDeclaratorId(mods, type);
     }
     protected JCVariableDecl implicitParameter() {
         JCModifiers mods = F.at(token.pos).Modifiers(Flags.PARAMETER);
         return variableDeclaratorId(mods, null);
     }
 /* ---------- auxiliary methods -------------- */
     void error(int pos, String key, Object ... args) {
         log.error(DiagnosticFlag.SYNTAX, pos, key, args);
     }
     void error(DiagnosticPosition pos, String key, Object ... args) {
         log.error(DiagnosticFlag.SYNTAX, pos, key, args);
     }
     void warning(int pos, String key, Object ... args) {
         log.warning(pos, key, args);
     }
     /** Check that given tree is a legal expression statement.
      */
     protected JCExpression checkExprStat(JCExpression t) {
         switch(t.getTag()) {
         case PREINC: case PREDEC:
         case POSTINC: case POSTDEC:
         case ASSIGN:
         case BITOR_ASG: case BITXOR_ASG: case BITAND_ASG:
         case SL_ASG: case SR_ASG: case USR_ASG:
         case PLUS_ASG: case MINUS_ASG:
         case MUL_ASG: case DIV_ASG: case MOD_ASG:
         case APPLY: case NEWCLASS:
         case ERRONEOUS:
             return t;
         default:
             JCExpression ret = F.at(t.pos).Erroneous(List.<JCTree>of(t));
             error(ret, "not.stmt");
             return ret;
         }
     }
     /** Return precedence of operator represented by token,
      *  -1 if token is not a binary operator. @see TreeInfo.opPrec
      */
     static int prec(TokenKind token) {
         JCTree.Tag oc = optag(token);
         return (oc != NO_TAG) ? TreeInfo.opPrec(oc) : -1;
     }
     /**
      * Return the lesser of two positions, making allowance for either one
      * being unset.
      */
     static int earlier(int pos1, int pos2) {
         if (pos1 == Position.NOPOS)
             return pos2;
         if (pos2 == Position.NOPOS)
             return pos1;
         return (pos1 < pos2 ? pos1 : pos2);
     }
     /** Return operation tag of binary operator represented by token,
      *  No_TAG if token is not a binary operator.
      */
     static JCTree.Tag optag(TokenKind token) {
         switch (token) {
         case BARBAR:
             return OR;
         case AMPAMP:
             return AND;
         case BAR:
             return BITOR;
         case BAREQ:
             return BITOR_ASG;
         case CARET:
             return BITXOR;
         case CARETEQ:
             return BITXOR_ASG;
         case AMP:
             return BITAND;
         case AMPEQ:
             return BITAND_ASG;
         case EQEQ:
             return JCTree.Tag.EQ;
         case BANGEQ:
             return NE;
         case LT:
             return JCTree.Tag.LT;
         case GT:
             return JCTree.Tag.GT;
         case LTEQ:
             return LE;
         case GTEQ:
             return GE;
         case LTLT:
             return SL;
         case LTLTEQ:
             return SL_ASG;
         case GTGT:
             return SR;
         case GTGTEQ:
             return SR_ASG;
         case GTGTGT:
             return USR;
         case GTGTGTEQ:
             return USR_ASG;
         case PLUS:
             return JCTree.Tag.PLUS;
         case PLUSEQ:
             return PLUS_ASG;
         case SUB:
             return MINUS;
         case SUBEQ:
             return MINUS_ASG;
         case STAR:
             return MUL;
         case STAREQ:
             return MUL_ASG;
         case SLASH:
             return DIV;
         case SLASHEQ:
             return DIV_ASG;
         case PERCENT:
             return MOD;
         case PERCENTEQ:
             return MOD_ASG;
         case INSTANCEOF:
             return TYPETEST;
         default:
             return NO_TAG;
         }
     }
     /** Return operation tag of unary operator represented by token,
      *  No_TAG if token is not a binary operator.
      */
     static JCTree.Tag unoptag(TokenKind token) {
         switch (token) {
         case PLUS:
             return POS;
         case SUB:
             return NEG;
         case BANG:
             return NOT;
         case TILDE:
             return COMPL;
         case PLUSPLUS:
             return PREINC;
         case SUBSUB:
             return PREDEC;
         default:
             return NO_TAG;
         }
     }
     /** Return type tag of basic type represented by token,
      *  NONE if token is not a basic type identifier.
      */
     static TypeTag typetag(TokenKind token) {
         switch (token) {
         case BYTE:
             return TypeTag.BYTE;
         case CHAR:
             return TypeTag.CHAR;
         case SHORT:
             return TypeTag.SHORT;
         case INT:
             return TypeTag.INT;
         case LONG:
             return TypeTag.LONG;
         case FLOAT:
             return TypeTag.FLOAT;
         case DOUBLE:
             return TypeTag.DOUBLE;
         case BOOLEAN:
             return TypeTag.BOOLEAN;
         default:
             return TypeTag.NONE;
         }
     }
     void checkGenerics() {
         if (!allowGenerics) {
             error(token.pos, "generics.not.supported.in.source", source.name);
             allowGenerics = true;
         }
     }
     void checkVarargs() {
         if (!allowVarargs) {
             error(token.pos, "varargs.not.supported.in.source", source.name);
             allowVarargs = true;
         }
     }
     void checkForeach() {
         if (!allowForeach) {
             error(token.pos, "foreach.not.supported.in.source", source.name);
             allowForeach = true;
         }
     }
     void checkStaticImports() {
         if (!allowStaticImport) {
             error(token.pos, "static.import.not.supported.in.source", source.name);
             allowStaticImport = true;
         }
     }
     void checkAnnotations() {
         if (!allowAnnotations) {
             error(token.pos, "annotations.not.supported.in.source", source.name);
             allowAnnotations = true;
         }
     }
     void checkDiamond() {
         if (!allowDiamond) {
             error(token.pos, "diamond.not.supported.in.source", source.name);
             allowDiamond = true;
         }
     }
     void checkMulticatch() {
         if (!allowMulticatch) {
             error(token.pos, "multicatch.not.supported.in.source", source.name);
             allowMulticatch = true;
         }
     }
     void checkTryWithResources() {
         if (!allowTWR) {
             error(token.pos, "try.with.resources.not.supported.in.source", source.name);
             allowTWR = true;
         }
     }
     void checkLambda() {
         if (!allowLambda) {
             log.error(token.pos, "lambda.not.supported.in.source", source.name);
             allowLambda = true;
         }
     }
     void checkMethodReferences() {
         if (!allowMethodReferences) {
             log.error(token.pos, "method.references.not.supported.in.source", source.name);
             allowMethodReferences = true;
         }
     }
     void checkDefaultMethods() {
         if (!allowDefaultMethods) {
             log.error(token.pos, "default.methods.not.supported.in.source", source.name);
             allowDefaultMethods = true;
         }
     }
     /*
      * a functional source tree and end position mappings
      */
     protected class SimpleEndPosTable extends AbstractEndPosTable {
         private final Map<JCTree, Integer> endPosMap;
         SimpleEndPosTable() {
             endPosMap = new HashMap<JCTree, Integer>();
         }
         protected void storeEnd(JCTree tree, int endpos) {
             endPosMap.put(tree, errorEndPos > endpos ? errorEndPos : endpos);
         }
         protected <T extends JCTree> T to(T t) {
             storeEnd(t, token.endPos);
             return t;
         }
         protected <T extends JCTree> T toP(T t) {
             storeEnd(t, S.prevToken().endPos);
             return t;
         }
         public int getEndPos(JCTree tree) {
             Integer value = endPosMap.get(tree);
             return (value == null) ? Position.NOPOS : value;
         }
         public int replaceTree(JCTree oldTree, JCTree newTree) {
             Integer pos = endPosMap.remove(oldTree);
             if (pos != null) {
                 endPosMap.put(newTree, pos);
                 return pos;
             }
             return Position.NOPOS;
         }
     }
     /*
      * a default skeletal implementation without any mapping overhead.
      */
     protected class EmptyEndPosTable extends AbstractEndPosTable {
         protected void storeEnd(JCTree tree, int endpos) { /* empty */ }
         protected <T extends JCTree> T to(T t) {
             return t;
         }
         protected <T extends JCTree> T toP(T t) {
             return t;
         }
         public int getEndPos(JCTree tree) {
             return Position.NOPOS;
         }
         public int replaceTree(JCTree oldTree, JCTree newTree) {
             return Position.NOPOS;
         }
     }
     protected abstract class AbstractEndPosTable implements EndPosTable {
         /**
          * Store the last error position.
          */
         protected int errorEndPos;
         /**
          * Store ending position for a tree, the value of which is the greater
          * of last error position and the given ending position.
          * @param tree   The tree.
          * @param endpos The ending position to associate with the tree.
          */
         protected abstract void storeEnd(JCTree tree, int endpos);
         /**
          * Store current token's ending position for a tree, the value of which
          * will be the greater of last error position and the ending position of
          * the current token.
          * @param t The tree.
          */
         protected abstract <T extends JCTree> T to(T t);
         /**
          * Store current token's ending position for a tree, the value of which
          * will be the greater of last error position and the ending position of
          * the previous token.
          * @param t The tree.
          */
         protected abstract <T extends JCTree> T toP(T t);
         /**
          * Set the error position during the parsing phases, the value of which
          * will be set only if it is greater than the last stored error position.
          * @param errPos The error position
          */
         protected void setErrorEndPos(int errPos) {
             if (errPos > errorEndPos) {
                 errorEndPos = errPos;
             }
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/parser/JavacParser.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/parser/JavacParser.java