jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java

Sat, 01 Dec 2007 00:00:00 +0000

author: duke
date: Sat, 01 Dec 2007 00:00:00 +0000
changeset 1: 9a66ca7c79fa
child 104: 5e89c4ca637c
permissions: -rw-r--r--

Initial load

 /*
  * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Sun designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Sun in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 package com.sun.tools.javac.tree;
 import com.sun.source.tree.Tree;
 import com.sun.tools.javac.comp.AttrContext;
 import com.sun.tools.javac.comp.Env;
 import java.util.Map;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.tree.JCTree.*;
 import static com.sun.tools.javac.code.Flags.*;
 import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
 /** Utility class containing inspector methods for trees.
  *
  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
  *  you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class TreeInfo {
     protected static final Context.Key<TreeInfo> treeInfoKey =
         new Context.Key<TreeInfo>();
     public static TreeInfo instance(Context context) {
         TreeInfo instance = context.get(treeInfoKey);
         if (instance == null)
             instance = new TreeInfo(context);
         return instance;
     }
     /** The names of all operators.
      */
     private Name[] opname = new Name[JCTree.MOD - JCTree.POS + 1];
     private TreeInfo(Context context) {
         context.put(treeInfoKey, this);
         Name.Table names = Name.Table.instance(context);
         opname[JCTree.POS     - JCTree.POS] = names.fromString("+");
         opname[JCTree.NEG     - JCTree.POS] = names.hyphen;
         opname[JCTree.NOT     - JCTree.POS] = names.fromString("!");
         opname[JCTree.COMPL   - JCTree.POS] = names.fromString("~");
         opname[JCTree.PREINC  - JCTree.POS] = names.fromString("++");
         opname[JCTree.PREDEC  - JCTree.POS] = names.fromString("--");
         opname[JCTree.POSTINC - JCTree.POS] = names.fromString("++");
         opname[JCTree.POSTDEC - JCTree.POS] = names.fromString("--");
         opname[JCTree.NULLCHK - JCTree.POS] = names.fromString("<*nullchk*>");
         opname[JCTree.OR      - JCTree.POS] = names.fromString("||");
         opname[JCTree.AND     - JCTree.POS] = names.fromString("&&");
         opname[JCTree.EQ      - JCTree.POS] = names.fromString("==");
         opname[JCTree.NE      - JCTree.POS] = names.fromString("!=");
         opname[JCTree.LT      - JCTree.POS] = names.fromString("<");
         opname[JCTree.GT      - JCTree.POS] = names.fromString(">");
         opname[JCTree.LE      - JCTree.POS] = names.fromString("<=");
         opname[JCTree.GE      - JCTree.POS] = names.fromString(">=");
         opname[JCTree.BITOR   - JCTree.POS] = names.fromString("|");
         opname[JCTree.BITXOR  - JCTree.POS] = names.fromString("^");
         opname[JCTree.BITAND  - JCTree.POS] = names.fromString("&");
         opname[JCTree.SL      - JCTree.POS] = names.fromString("<<");
         opname[JCTree.SR      - JCTree.POS] = names.fromString(">>");
         opname[JCTree.USR     - JCTree.POS] = names.fromString(">>>");
         opname[JCTree.PLUS    - JCTree.POS] = names.fromString("+");
         opname[JCTree.MINUS   - JCTree.POS] = names.hyphen;
         opname[JCTree.MUL     - JCTree.POS] = names.asterisk;
         opname[JCTree.DIV     - JCTree.POS] = names.slash;
         opname[JCTree.MOD     - JCTree.POS] = names.fromString("%");
     }
     /** Return name of operator with given tree tag.
      */
     public Name operatorName(int tag) {
         return opname[tag - JCTree.POS];
     }
     /** Is tree a constructor declaration?
      */
     public static boolean isConstructor(JCTree tree) {
         if (tree.getTag() == JCTree.METHODDEF) {
             Name name = ((JCMethodDecl) tree).name;
             return name == name.table.init;
         } else {
             return false;
         }
     }
     /** Is there a constructor declaration in the given list of trees?
      */
     public static boolean hasConstructors(List<JCTree> trees) {
         for (List<JCTree> l = trees; l.nonEmpty(); l = l.tail)
             if (isConstructor(l.head)) return true;
         return false;
     }
     /** Is statement an initializer for a synthetic field?
      */
     public static boolean isSyntheticInit(JCTree stat) {
         if (stat.getTag() == JCTree.EXEC) {
             JCExpressionStatement exec = (JCExpressionStatement)stat;
             if (exec.expr.getTag() == JCTree.ASSIGN) {
                 JCAssign assign = (JCAssign)exec.expr;
                 if (assign.lhs.getTag() == JCTree.SELECT) {
                     JCFieldAccess select = (JCFieldAccess)assign.lhs;
                     if (select.sym != null &&
                         (select.sym.flags() & SYNTHETIC) != 0) {
                         Name selected = name(select.selected);
                         if (selected != null && selected == selected.table._this)
                             return true;
                     }
                 }
             }
         }
         return false;
     }
     /** If the expression is a method call, return the method name, null
      *  otherwise. */
     public static Name calledMethodName(JCTree tree) {
         if (tree.getTag() == JCTree.EXEC) {
             JCExpressionStatement exec = (JCExpressionStatement)tree;
             if (exec.expr.getTag() == JCTree.APPLY) {
                 Name mname = TreeInfo.name(((JCMethodInvocation) exec.expr).meth);
                 return mname;
             }
         }
         return null;
     }
     /** Is this a call to this or super?
      */
     public static boolean isSelfCall(JCTree tree) {
         Name name = calledMethodName(tree);
         if (name != null) {
             Name.Table names = name.table;
             return name==names._this || name==names._super;
         } else {
             return false;
         }
     }
     /** Is this a call to super?
      */
     public static boolean isSuperCall(JCTree tree) {
         Name name = calledMethodName(tree);
         if (name != null) {
             Name.Table names = name.table;
             return name==names._super;
         } else {
             return false;
         }
     }
     /** Is this a constructor whose first (non-synthetic) statement is not
      *  of the form this(...)?
      */
     public static boolean isInitialConstructor(JCTree tree) {
         JCMethodInvocation app = firstConstructorCall(tree);
         if (app == null) return false;
         Name meth = name(app.meth);
         return meth == null || meth != meth.table._this;
     }
     /** Return the first call in a constructor definition. */
     public static JCMethodInvocation firstConstructorCall(JCTree tree) {
         if (tree.getTag() != JCTree.METHODDEF) return null;
         JCMethodDecl md = (JCMethodDecl) tree;
         Name.Table names = md.name.table;
         if (md.name != names.init) return null;
         if (md.body == null) return null;
         List<JCStatement> stats = md.body.stats;
         // Synthetic initializations can appear before the super call.
         while (stats.nonEmpty() && isSyntheticInit(stats.head))
             stats = stats.tail;
         if (stats.isEmpty()) return null;
         if (stats.head.getTag() != JCTree.EXEC) return null;
         JCExpressionStatement exec = (JCExpressionStatement) stats.head;
         if (exec.expr.getTag() != JCTree.APPLY) return null;
         return (JCMethodInvocation)exec.expr;
     }
     /** Return true if a tree represents the null literal. */
     public static boolean isNull(JCTree tree) {
         if (tree.getTag() != JCTree.LITERAL)
             return false;
         JCLiteral lit = (JCLiteral) tree;
         return (lit.typetag == TypeTags.BOT);
     }
     /** The position of the first statement in a block, or the position of
      *  the block itself if it is empty.
      */
     public static int firstStatPos(JCTree tree) {
         if (tree.getTag() == JCTree.BLOCK && ((JCBlock) tree).stats.nonEmpty())
             return ((JCBlock) tree).stats.head.pos;
         else
             return tree.pos;
     }
     /** The end position of given tree, if it is a block with
      *  defined endpos.
      */
     public static int endPos(JCTree tree) {
         if (tree.getTag() == JCTree.BLOCK && ((JCBlock) tree).endpos != Position.NOPOS)
             return ((JCBlock) tree).endpos;
         else if (tree.getTag() == JCTree.SYNCHRONIZED)
             return endPos(((JCSynchronized) tree).body);
         else if (tree.getTag() == JCTree.TRY) {
             JCTry t = (JCTry) tree;
             return endPos((t.finalizer != null)
                           ? t.finalizer
                           : t.catchers.last().body);
         } else
             return tree.pos;
     }
     /** 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 static int getStartPos(JCTree tree) {
         if (tree == null)
             return Position.NOPOS;
         switch(tree.getTag()) {
         case(JCTree.APPLY):
             return getStartPos(((JCMethodInvocation) tree).meth);
         case(JCTree.ASSIGN):
             return getStartPos(((JCAssign) tree).lhs);
         case(JCTree.BITOR_ASG): case(JCTree.BITXOR_ASG): case(JCTree.BITAND_ASG):
         case(JCTree.SL_ASG): case(JCTree.SR_ASG): case(JCTree.USR_ASG):
         case(JCTree.PLUS_ASG): case(JCTree.MINUS_ASG): case(JCTree.MUL_ASG):
         case(JCTree.DIV_ASG): case(JCTree.MOD_ASG):
             return getStartPos(((JCAssignOp) tree).lhs);
         case(JCTree.OR): case(JCTree.AND): case(JCTree.BITOR):
         case(JCTree.BITXOR): case(JCTree.BITAND): case(JCTree.EQ):
         case(JCTree.NE): case(JCTree.LT): case(JCTree.GT):
         case(JCTree.LE): case(JCTree.GE): case(JCTree.SL):
         case(JCTree.SR): case(JCTree.USR): case(JCTree.PLUS):
         case(JCTree.MINUS): case(JCTree.MUL): case(JCTree.DIV):
         case(JCTree.MOD):
             return getStartPos(((JCBinary) tree).lhs);
         case(JCTree.CLASSDEF): {
             JCClassDecl node = (JCClassDecl)tree;
             if (node.mods.pos != Position.NOPOS)
                 return node.mods.pos;
             break;
         }
         case(JCTree.CONDEXPR):
             return getStartPos(((JCConditional) tree).cond);
         case(JCTree.EXEC):
             return getStartPos(((JCExpressionStatement) tree).expr);
         case(JCTree.INDEXED):
             return getStartPos(((JCArrayAccess) tree).indexed);
         case(JCTree.METHODDEF): {
             JCMethodDecl node = (JCMethodDecl)tree;
             if (node.mods.pos != Position.NOPOS)
                 return node.mods.pos;
             if (node.typarams.nonEmpty()) // List.nil() used for no typarams
                 return getStartPos(node.typarams.head);
             return node.restype == null ? node.pos : getStartPos(node.restype);
         }
         case(JCTree.SELECT):
             return getStartPos(((JCFieldAccess) tree).selected);
         case(JCTree.TYPEAPPLY):
             return getStartPos(((JCTypeApply) tree).clazz);
         case(JCTree.TYPEARRAY):
             return getStartPos(((JCArrayTypeTree) tree).elemtype);
         case(JCTree.TYPETEST):
             return getStartPos(((JCInstanceOf) tree).expr);
         case(JCTree.POSTINC):
         case(JCTree.POSTDEC):
             return getStartPos(((JCUnary) tree).arg);
         case(JCTree.VARDEF): {
             JCVariableDecl node = (JCVariableDecl)tree;
             if (node.mods.pos != Position.NOPOS) {
                 return node.mods.pos;
             } else {
                 return getStartPos(node.vartype);
             }
         }
         case(JCTree.ERRONEOUS): {
             JCErroneous node = (JCErroneous)tree;
             if (node.errs != null && node.errs.nonEmpty())
                 return getStartPos(node.errs.head);
         }
         }
         return tree.pos;
     }
     /** The end position of given tree, given  a table of end positions generated by the parser
      */
     public static int getEndPos(JCTree tree, Map<JCTree, Integer> endPositions) {
         if (tree == null)
             return Position.NOPOS;
         if (endPositions == null) {
             // fall back on limited info in the tree
             return endPos(tree);
         }
         Integer mapPos = endPositions.get(tree);
         if (mapPos != null)
             return mapPos;
         switch(tree.getTag()) {
         case(JCTree.BITOR_ASG): case(JCTree.BITXOR_ASG): case(JCTree.BITAND_ASG):
         case(JCTree.SL_ASG): case(JCTree.SR_ASG): case(JCTree.USR_ASG):
         case(JCTree.PLUS_ASG): case(JCTree.MINUS_ASG): case(JCTree.MUL_ASG):
         case(JCTree.DIV_ASG): case(JCTree.MOD_ASG):
             return getEndPos(((JCAssignOp) tree).rhs, endPositions);
         case(JCTree.OR): case(JCTree.AND): case(JCTree.BITOR):
         case(JCTree.BITXOR): case(JCTree.BITAND): case(JCTree.EQ):
         case(JCTree.NE): case(JCTree.LT): case(JCTree.GT):
         case(JCTree.LE): case(JCTree.GE): case(JCTree.SL):
         case(JCTree.SR): case(JCTree.USR): case(JCTree.PLUS):
         case(JCTree.MINUS): case(JCTree.MUL): case(JCTree.DIV):
         case(JCTree.MOD):
             return getEndPos(((JCBinary) tree).rhs, endPositions);
         case(JCTree.CASE):
             return getEndPos(((JCCase) tree).stats.last(), endPositions);
         case(JCTree.CATCH):
             return getEndPos(((JCCatch) tree).body, endPositions);
         case(JCTree.CONDEXPR):
             return getEndPos(((JCConditional) tree).falsepart, endPositions);
         case(JCTree.FORLOOP):
             return getEndPos(((JCForLoop) tree).body, endPositions);
         case(JCTree.FOREACHLOOP):
             return getEndPos(((JCEnhancedForLoop) tree).body, endPositions);
         case(JCTree.IF): {
             JCIf node = (JCIf)tree;
             if (node.elsepart == null) {
                 return getEndPos(node.thenpart, endPositions);
             } else {
                 return getEndPos(node.elsepart, endPositions);
             }
         }
         case(JCTree.LABELLED):
             return getEndPos(((JCLabeledStatement) tree).body, endPositions);
         case(JCTree.MODIFIERS):
             return getEndPos(((JCModifiers) tree).annotations.last(), endPositions);
         case(JCTree.SYNCHRONIZED):
             return getEndPos(((JCSynchronized) tree).body, endPositions);
         case(JCTree.TOPLEVEL):
             return getEndPos(((JCCompilationUnit) tree).defs.last(), endPositions);
         case(JCTree.TRY): {
             JCTry node = (JCTry)tree;
             if (node.finalizer != null) {
                 return getEndPos(node.finalizer, endPositions);
             } else if (!node.catchers.isEmpty()) {
                 return getEndPos(node.catchers.last(), endPositions);
             } else {
                 return getEndPos(node.body, endPositions);
             }
         }
         case(JCTree.WILDCARD):
             return getEndPos(((JCWildcard) tree).inner, endPositions);
         case(JCTree.TYPECAST):
             return getEndPos(((JCTypeCast) tree).expr, endPositions);
         case(JCTree.TYPETEST):
             return getEndPos(((JCInstanceOf) tree).clazz, endPositions);
         case(JCTree.POS):
         case(JCTree.NEG):
         case(JCTree.NOT):
         case(JCTree.COMPL):
         case(JCTree.PREINC):
         case(JCTree.PREDEC):
             return getEndPos(((JCUnary) tree).arg, endPositions);
         case(JCTree.WHILELOOP):
             return getEndPos(((JCWhileLoop) tree).body, endPositions);
         case(JCTree.ERRONEOUS): {
             JCErroneous node = (JCErroneous)tree;
             if (node.errs != null && node.errs.nonEmpty())
                 return getEndPos(node.errs.last(), endPositions);
         }
         }
         return Position.NOPOS;
     }
     /** A DiagnosticPosition with the preferred position set to the
      *  end position of given tree, if it is a block with
      *  defined endpos.
      */
     public static DiagnosticPosition diagEndPos(final JCTree tree) {
         final int endPos = TreeInfo.endPos(tree);
         return new DiagnosticPosition() {
             public JCTree getTree() { return tree; }
             public int getStartPosition() { return TreeInfo.getStartPos(tree); }
             public int getPreferredPosition() { return endPos; }
             public int getEndPosition(Map<JCTree, Integer> endPosTable) {
                 return TreeInfo.getEndPos(tree, endPosTable);
             }
         };
     }
     /** The position of the finalizer of given try/synchronized statement.
      */
     public static int finalizerPos(JCTree tree) {
         if (tree.getTag() == JCTree.TRY) {
             JCTry t = (JCTry) tree;
             assert t.finalizer != null;
             return firstStatPos(t.finalizer);
         } else if (tree.getTag() == JCTree.SYNCHRONIZED) {
             return endPos(((JCSynchronized) tree).body);
         } else {
             throw new AssertionError();
         }
     }
     /** Find the position for reporting an error about a symbol, where
      *  that symbol is defined somewhere in the given tree. */
     public static int positionFor(final Symbol sym, final JCTree tree) {
         JCTree decl = declarationFor(sym, tree);
         return ((decl != null) ? decl : tree).pos;
     }
     /** Find the position for reporting an error about a symbol, where
      *  that symbol is defined somewhere in the given tree. */
     public static DiagnosticPosition diagnosticPositionFor(final Symbol sym, final JCTree tree) {
         JCTree decl = declarationFor(sym, tree);
         return ((decl != null) ? decl : tree).pos();
     }
     /** Find the declaration for a symbol, where
      *  that symbol is defined somewhere in the given tree. */
     public static JCTree declarationFor(final Symbol sym, final JCTree tree) {
         class DeclScanner extends TreeScanner {
             JCTree result = null;
             public void scan(JCTree tree) {
                 if (tree!=null && result==null)
                     tree.accept(this);
             }
             public void visitTopLevel(JCCompilationUnit that) {
                 if (that.packge == sym) result = that;
                 else super.visitTopLevel(that);
             }
             public void visitClassDef(JCClassDecl that) {
                 if (that.sym == sym) result = that;
                 else super.visitClassDef(that);
             }
             public void visitMethodDef(JCMethodDecl that) {
                 if (that.sym == sym) result = that;
                 else super.visitMethodDef(that);
             }
             public void visitVarDef(JCVariableDecl that) {
                 if (that.sym == sym) result = that;
                 else super.visitVarDef(that);
             }
         }
         DeclScanner s = new DeclScanner();
         tree.accept(s);
         return s.result;
     }
     public static Env<AttrContext> scopeFor(JCTree node, JCCompilationUnit unit) {
         return scopeFor(pathFor(node, unit));
     }
     public static Env<AttrContext> scopeFor(List<JCTree> path) {
         // TODO: not implemented yet
         throw new UnsupportedOperationException("not implemented yet");
     }
     public static List<JCTree> pathFor(final JCTree node, final JCCompilationUnit unit) {
         class Result extends Error {
             static final long serialVersionUID = -5942088234594905625L;
             List<JCTree> path;
             Result(List<JCTree> path) {
                 this.path = path;
             }
         }
         class PathFinder extends TreeScanner {
             List<JCTree> path = List.nil();
             public void scan(JCTree tree) {
                 if (tree != null) {
                     path = path.prepend(tree);
                     if (tree == node)
                         throw new Result(path);
                     super.scan(tree);
                     path = path.tail;
                 }
             }
         }
         try {
             new PathFinder().scan(unit);
         } catch (Result result) {
             return result.path;
         }
         return List.nil();
     }
     /** Return the statement referenced by a label.
      *  If the label refers to a loop or switch, return that switch
      *  otherwise return the labelled statement itself
      */
     public static JCTree referencedStatement(JCLabeledStatement tree) {
         JCTree t = tree;
         do t = ((JCLabeledStatement) t).body;
         while (t.getTag() == JCTree.LABELLED);
         switch (t.getTag()) {
         case JCTree.DOLOOP: case JCTree.WHILELOOP: case JCTree.FORLOOP: case JCTree.FOREACHLOOP: case JCTree.SWITCH:
             return t;
         default:
             return tree;
         }
     }
     /** Skip parens and return the enclosed expression
      */
     public static JCExpression skipParens(JCExpression tree) {
         while (tree.getTag() == JCTree.PARENS) {
             tree = ((JCParens) tree).expr;
         }
         return tree;
     }
     /** Skip parens and return the enclosed expression
      */
     public static JCTree skipParens(JCTree tree) {
         if (tree.getTag() == JCTree.PARENS)
             return skipParens((JCParens)tree);
         else
             return tree;
     }
     /** Return the types of a list of trees.
      */
     public static List<Type> types(List<? extends JCTree> trees) {
         ListBuffer<Type> ts = new ListBuffer<Type>();
         for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
             ts.append(l.head.type);
         return ts.toList();
     }
     /** If this tree is an identifier or a field or a parameterized type,
      *  return its name, otherwise return null.
      */
     public static Name name(JCTree tree) {
         switch (tree.getTag()) {
         case JCTree.IDENT:
             return ((JCIdent) tree).name;
         case JCTree.SELECT:
             return ((JCFieldAccess) tree).name;
         case JCTree.TYPEAPPLY:
             return name(((JCTypeApply) tree).clazz);
         default:
             return null;
         }
     }
     /** If this tree is a qualified identifier, its return fully qualified name,
      *  otherwise return null.
      */
     public static Name fullName(JCTree tree) {
         tree = skipParens(tree);
         switch (tree.getTag()) {
         case JCTree.IDENT:
             return ((JCIdent) tree).name;
         case JCTree.SELECT:
             Name sname = fullName(((JCFieldAccess) tree).selected);
             return sname == null ? null : sname.append('.', name(tree));
         default:
             return null;
         }
     }
     public static Symbol symbolFor(JCTree node) {
         node = skipParens(node);
         switch (node.getTag()) {
         case JCTree.CLASSDEF:
             return ((JCClassDecl) node).sym;
         case JCTree.METHODDEF:
             return ((JCMethodDecl) node).sym;
         case JCTree.VARDEF:
             return ((JCVariableDecl) node).sym;
         default:
             return null;
         }
     }
     /** If this tree is an identifier or a field, return its symbol,
      *  otherwise return null.
      */
     public static Symbol symbol(JCTree tree) {
         tree = skipParens(tree);
         switch (tree.getTag()) {
         case JCTree.IDENT:
             return ((JCIdent) tree).sym;
         case JCTree.SELECT:
             return ((JCFieldAccess) tree).sym;
         case JCTree.TYPEAPPLY:
             return symbol(((JCTypeApply) tree).clazz);
         default:
             return null;
         }
     }
     /** Return true if this is a nonstatic selection. */
     public static boolean nonstaticSelect(JCTree tree) {
         tree = skipParens(tree);
         if (tree.getTag() != JCTree.SELECT) return false;
         JCFieldAccess s = (JCFieldAccess) tree;
         Symbol e = symbol(s.selected);
         return e == null || (e.kind != Kinds.PCK && e.kind != Kinds.TYP);
     }
     /** If this tree is an identifier or a field, set its symbol, otherwise skip.
      */
     public static void setSymbol(JCTree tree, Symbol sym) {
         tree = skipParens(tree);
         switch (tree.getTag()) {
         case JCTree.IDENT:
             ((JCIdent) tree).sym = sym; break;
         case JCTree.SELECT:
             ((JCFieldAccess) tree).sym = sym; break;
         default:
         }
     }
     /** If this tree is a declaration or a block, return its flags field,
      *  otherwise return 0.
      */
     public static long flags(JCTree tree) {
         switch (tree.getTag()) {
         case JCTree.VARDEF:
             return ((JCVariableDecl) tree).mods.flags;
         case JCTree.METHODDEF:
             return ((JCMethodDecl) tree).mods.flags;
         case JCTree.CLASSDEF:
             return ((JCClassDecl) tree).mods.flags;
         case JCTree.BLOCK:
             return ((JCBlock) tree).flags;
         default:
             return 0;
         }
     }
     /** Return first (smallest) flag in `flags':
      *  pre: flags != 0
      */
     public static long firstFlag(long flags) {
         int flag = 1;
         while ((flag & StandardFlags) != 0 && (flag & flags) == 0)
             flag = flag << 1;
         return flag;
     }
     /** Return flags as a string, separated by " ".
      */
     public static String flagNames(long flags) {
         return Flags.toString(flags & StandardFlags).trim();
     }
     /** Operator precedences values.
      */
     public static final int
         notExpression = -1,   // not an expression
         noPrec = 0,           // no enclosing expression
         assignPrec = 1,
         assignopPrec = 2,
         condPrec = 3,
         orPrec = 4,
         andPrec = 5,
         bitorPrec = 6,
         bitxorPrec = 7,
         bitandPrec = 8,
         eqPrec = 9,
         ordPrec = 10,
         shiftPrec = 11,
         addPrec = 12,
         mulPrec = 13,
         prefixPrec = 14,
         postfixPrec = 15,
         precCount = 16;
     /** Map operators to their precedence levels.
      */
     public static int opPrec(int op) {
         switch(op) {
         case JCTree.POS:
         case JCTree.NEG:
         case JCTree.NOT:
         case JCTree.COMPL:
         case JCTree.PREINC:
         case JCTree.PREDEC: return prefixPrec;
         case JCTree.POSTINC:
         case JCTree.POSTDEC:
         case JCTree.NULLCHK: return postfixPrec;
         case JCTree.ASSIGN: return assignPrec;
         case JCTree.BITOR_ASG:
         case JCTree.BITXOR_ASG:
         case JCTree.BITAND_ASG:
         case JCTree.SL_ASG:
         case JCTree.SR_ASG:
         case JCTree.USR_ASG:
         case JCTree.PLUS_ASG:
         case JCTree.MINUS_ASG:
         case JCTree.MUL_ASG:
         case JCTree.DIV_ASG:
         case JCTree.MOD_ASG: return assignopPrec;
         case JCTree.OR: return orPrec;
         case JCTree.AND: return andPrec;
         case JCTree.EQ:
         case JCTree.NE: return eqPrec;
         case JCTree.LT:
         case JCTree.GT:
         case JCTree.LE:
         case JCTree.GE: return ordPrec;
         case JCTree.BITOR: return bitorPrec;
         case JCTree.BITXOR: return bitxorPrec;
         case JCTree.BITAND: return bitandPrec;
         case JCTree.SL:
         case JCTree.SR:
         case JCTree.USR: return shiftPrec;
         case JCTree.PLUS:
         case JCTree.MINUS: return addPrec;
         case JCTree.MUL:
         case JCTree.DIV:
         case JCTree.MOD: return mulPrec;
         case JCTree.TYPETEST: return ordPrec;
         default: throw new AssertionError();
         }
     }
     static Tree.Kind tagToKind(int tag) {
         switch (tag) {
         // Postfix expressions
         case JCTree.POSTINC:           // _ ++
             return Tree.Kind.POSTFIX_INCREMENT;
         case JCTree.POSTDEC:           // _ --
             return Tree.Kind.POSTFIX_DECREMENT;
         // Unary operators
         case JCTree.PREINC:            // ++ _
             return Tree.Kind.PREFIX_INCREMENT;
         case JCTree.PREDEC:            // -- _
             return Tree.Kind.PREFIX_DECREMENT;
         case JCTree.POS:               // +
             return Tree.Kind.UNARY_PLUS;
         case JCTree.NEG:               // -
             return Tree.Kind.UNARY_MINUS;
         case JCTree.COMPL:             // ~
             return Tree.Kind.BITWISE_COMPLEMENT;
         case JCTree.NOT:               // !
             return Tree.Kind.LOGICAL_COMPLEMENT;
         // Binary operators
         // Multiplicative operators
         case JCTree.MUL:               // *
             return Tree.Kind.MULTIPLY;
         case JCTree.DIV:               // /
             return Tree.Kind.DIVIDE;
         case JCTree.MOD:               // %
             return Tree.Kind.REMAINDER;
         // Additive operators
         case JCTree.PLUS:              // +
             return Tree.Kind.PLUS;
         case JCTree.MINUS:             // -
             return Tree.Kind.MINUS;
         // Shift operators
         case JCTree.SL:                // <<
             return Tree.Kind.LEFT_SHIFT;
         case JCTree.SR:                // >>
             return Tree.Kind.RIGHT_SHIFT;
         case JCTree.USR:               // >>>
             return Tree.Kind.UNSIGNED_RIGHT_SHIFT;
         // Relational operators
         case JCTree.LT:                // <
             return Tree.Kind.LESS_THAN;
         case JCTree.GT:                // >
             return Tree.Kind.GREATER_THAN;
         case JCTree.LE:                // <=
             return Tree.Kind.LESS_THAN_EQUAL;
         case JCTree.GE:                // >=
             return Tree.Kind.GREATER_THAN_EQUAL;
         // Equality operators
         case JCTree.EQ:                // ==
             return Tree.Kind.EQUAL_TO;
         case JCTree.NE:                // !=
             return Tree.Kind.NOT_EQUAL_TO;
         // Bitwise and logical operators
         case JCTree.BITAND:            // &
             return Tree.Kind.AND;
         case JCTree.BITXOR:            // ^
             return Tree.Kind.XOR;
         case JCTree.BITOR:             // |
             return Tree.Kind.OR;
         // Conditional operators
         case JCTree.AND:               // &&
             return Tree.Kind.CONDITIONAL_AND;
         case JCTree.OR:                // ||
             return Tree.Kind.CONDITIONAL_OR;
         // Assignment operators
         case JCTree.MUL_ASG:           // *=
             return Tree.Kind.MULTIPLY_ASSIGNMENT;
         case JCTree.DIV_ASG:           // /=
             return Tree.Kind.DIVIDE_ASSIGNMENT;
         case JCTree.MOD_ASG:           // %=
             return Tree.Kind.REMAINDER_ASSIGNMENT;
         case JCTree.PLUS_ASG:          // +=
             return Tree.Kind.PLUS_ASSIGNMENT;
         case JCTree.MINUS_ASG:         // -=
             return Tree.Kind.MINUS_ASSIGNMENT;
         case JCTree.SL_ASG:            // <<=
             return Tree.Kind.LEFT_SHIFT_ASSIGNMENT;
         case JCTree.SR_ASG:            // >>=
             return Tree.Kind.RIGHT_SHIFT_ASSIGNMENT;
         case JCTree.USR_ASG:           // >>>=
             return Tree.Kind.UNSIGNED_RIGHT_SHIFT_ASSIGNMENT;
         case JCTree.BITAND_ASG:        // &=
             return Tree.Kind.AND_ASSIGNMENT;
         case JCTree.BITXOR_ASG:        // ^=
             return Tree.Kind.XOR_ASSIGNMENT;
         case JCTree.BITOR_ASG:         // |=
             return Tree.Kind.OR_ASSIGNMENT;
         // Null check (implementation detail), for example, __.getClass()
         case JCTree.NULLCHK:
             return Tree.Kind.OTHER;
         default:
             return null;
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@9a66ca7c79fa (annotated)

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java