jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@573ceb23beeb (annotated)

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@573ceb23beeb (annotated)

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

Fri, 05 Oct 2012 14:35:24 +0100

author: mcimadamore
date: Fri, 05 Oct 2012 14:35:24 +0100
changeset 1348: 573ceb23beeb
parent 1347: 1408af4cd8b0
child 1352: d4b3cb1ece84
permissions: -rw-r--r--

7177385: Add attribution support for lambda expressions
Summary: Add support for function descriptor lookup, functional interface inference and lambda expression type-checking
Reviewed-by: jjg, dlsmith

 /*
  * 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.tree;
 import com.sun.source.tree.Tree;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.comp.AttrContext;
 import com.sun.tools.javac.comp.Env;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import static com.sun.tools.javac.code.Flags.*;
 import static com.sun.tools.javac.tree.JCTree.Tag.*;
 import static com.sun.tools.javac.tree.JCTree.Tag.BLOCK;
 import static com.sun.tools.javac.tree.JCTree.Tag.SYNCHRONIZED;
 /** Utility class containing inspector methods for trees.
  *
  *  <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 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[Tag.getNumberOfOperators()];
     private void setOpname(Tag tag, String name, Names names) {
          setOpname(tag, names.fromString(name));
      }
      private void setOpname(Tag tag, Name name) {
          opname[tag.operatorIndex()] = name;
      }
     private TreeInfo(Context context) {
         context.put(treeInfoKey, this);
         Names names = Names.instance(context);
         setOpname(POS, "+", names);
         setOpname(NEG, names.hyphen);
         setOpname(NOT, "!", names);
         setOpname(COMPL, "~", names);
         setOpname(PREINC, "++", names);
         setOpname(PREDEC, "--", names);
         setOpname(POSTINC, "++", names);
         setOpname(POSTDEC, "--", names);
         setOpname(NULLCHK, "<*nullchk*>", names);
         setOpname(OR, "||", names);
         setOpname(AND, "&&", names);
         setOpname(EQ, "==", names);
         setOpname(NE, "!=", names);
         setOpname(LT, "<", names);
         setOpname(GT, ">", names);
         setOpname(LE, "<=", names);
         setOpname(GE, ">=", names);
         setOpname(BITOR, "|", names);
         setOpname(BITXOR, "^", names);
         setOpname(BITAND, "&", names);
         setOpname(SL, "<<", names);
         setOpname(SR, ">>", names);
         setOpname(USR, ">>>", names);
         setOpname(PLUS, "+", names);
         setOpname(MINUS, names.hyphen);
         setOpname(MUL, names.asterisk);
         setOpname(DIV, names.slash);
         setOpname(MOD, "%", names);
     }
     public static List<JCExpression> args(JCTree t) {
         switch (t.getTag()) {
             case APPLY:
                 return ((JCMethodInvocation)t).args;
             case NEWCLASS:
                 return ((JCNewClass)t).args;
             default:
                 return null;
         }
     }
     /** Return name of operator with given tree tag.
      */
     public Name operatorName(JCTree.Tag tag) {
         return opname[tag.operatorIndex()];
     }
     /** Is tree a constructor declaration?
      */
     public static boolean isConstructor(JCTree tree) {
         if (tree.hasTag(METHODDEF)) {
             Name name = ((JCMethodDecl) tree).name;
             return name == name.table.names.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;
     }
     public static boolean isMultiCatch(JCCatch catchClause) {
         return catchClause.param.vartype.hasTag(TYPEUNION);
     }
     /** Is statement an initializer for a synthetic field?
      */
     public static boolean isSyntheticInit(JCTree stat) {
         if (stat.hasTag(EXEC)) {
             JCExpressionStatement exec = (JCExpressionStatement)stat;
             if (exec.expr.hasTag(ASSIGN)) {
                 JCAssign assign = (JCAssign)exec.expr;
                 if (assign.lhs.hasTag(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.names._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.hasTag(EXEC)) {
             JCExpressionStatement exec = (JCExpressionStatement)tree;
             if (exec.expr.hasTag(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) {
             Names names = name.table.names;
             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) {
             Names names = name.table.names;
             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.names._this;
     }
     /** Return the first call in a constructor definition. */
     public static JCMethodInvocation firstConstructorCall(JCTree tree) {
         if (!tree.hasTag(METHODDEF)) return null;
         JCMethodDecl md = (JCMethodDecl) tree;
         Names names = md.name.table.names;
         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.hasTag(EXEC)) return null;
         JCExpressionStatement exec = (JCExpressionStatement) stats.head;
         if (!exec.expr.hasTag(APPLY)) return null;
         return (JCMethodInvocation)exec.expr;
     }
     /** Return true if a tree represents a diamond new expr. */
     public static boolean isDiamond(JCTree tree) {
         switch(tree.getTag()) {
             case TYPEAPPLY: return ((JCTypeApply)tree).getTypeArguments().isEmpty();
             case NEWCLASS: return isDiamond(((JCNewClass)tree).clazz);
             default: return false;
         }
     }
     public static boolean isEnumInit(JCTree tree) {
         switch (tree.getTag()) {
             case VARDEF:
                 return (((JCVariableDecl)tree).mods.flags & ENUM) != 0;
             default:
                 return false;
         }
     }
     /** Return true if a a tree corresponds to a poly expression. */
     public static boolean isPoly(JCTree tree, JCTree origin) {
         switch (tree.getTag()) {
             case APPLY:
             case NEWCLASS:
             case CONDEXPR:
                 return !origin.hasTag(TYPECAST);
             case LAMBDA:
             case REFERENCE:
                 return true;
             case PARENS:
                 return isPoly(((JCParens)tree).expr, origin);
             default:
                 return false;
         }
     }
     public static boolean isExplicitLambda(JCLambda lambda) {
         return lambda.params.isEmpty() ||
                 lambda.params.head.vartype != null;
     }
     /**
      * Return true if the AST corresponds to a static select of the kind A.B
      */
     public static boolean isStaticSelector(JCTree base, Names names) {
         if (base == null)
             return false;
         switch (base.getTag()) {
             case IDENT:
                 JCIdent id = (JCIdent)base;
                 return id.name != names._this &&
                         id.name != names._super &&
                         isStaticSym(base);
             case SELECT:
                 return isStaticSym(base) &&
                     isStaticSelector(((JCFieldAccess)base).selected, names);
             case TYPEAPPLY:
                 return true;
             default:
                 return false;
         }
     }
     //where
         private static boolean isStaticSym(JCTree tree) {
             Symbol sym = symbol(tree);
             return (sym.kind == Kinds.TYP ||
                     sym.kind == Kinds.PCK);
         }
     /** Return true if a tree represents the null literal. */
     public static boolean isNull(JCTree tree) {
         if (!tree.hasTag(LITERAL))
             return false;
         JCLiteral lit = (JCLiteral) tree;
         return (lit.typetag == TypeTags.BOT);
     }
     public static String getCommentText(Env<?> env, JCTree tree) {
         DocCommentTable docComments = (tree.hasTag(JCTree.Tag.TOPLEVEL))
                 ? ((JCCompilationUnit) tree).docComments
                 : env.toplevel.docComments;
         return (docComments == null) ? null : docComments.getCommentText(tree);
     }
     /** 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.hasTag(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.hasTag(BLOCK) && ((JCBlock) tree).endpos != Position.NOPOS)
             return ((JCBlock) tree).endpos;
         else if (tree.hasTag(SYNCHRONIZED))
             return endPos(((JCSynchronized) tree).body);
         else if (tree.hasTag(TRY)) {
             JCTry t = (JCTry) tree;
             return endPos((t.finalizer != null) ? t.finalizer
                           : (t.catchers.nonEmpty() ? t.catchers.last().body : t.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 APPLY:
                 return getStartPos(((JCMethodInvocation) tree).meth);
             case ASSIGN:
                 return getStartPos(((JCAssign) tree).lhs);
             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:
                 return getStartPos(((JCAssignOp) tree).lhs);
             case OR: case AND: case BITOR:
             case BITXOR: case BITAND: case EQ:
             case NE: case LT: case GT:
             case LE: case GE: case SL:
             case SR: case USR: case PLUS:
             case MINUS: case MUL: case DIV:
             case MOD:
                 return getStartPos(((JCBinary) tree).lhs);
             case CLASSDEF: {
                 JCClassDecl node = (JCClassDecl)tree;
                 if (node.mods.pos != Position.NOPOS)
                     return node.mods.pos;
                 break;
             }
             case CONDEXPR:
                 return getStartPos(((JCConditional) tree).cond);
             case EXEC:
                 return getStartPos(((JCExpressionStatement) tree).expr);
             case INDEXED:
                 return getStartPos(((JCArrayAccess) tree).indexed);
             case 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 SELECT:
                 return getStartPos(((JCFieldAccess) tree).selected);
             case TYPEAPPLY:
                 return getStartPos(((JCTypeApply) tree).clazz);
             case TYPEARRAY:
                 return getStartPos(((JCArrayTypeTree) tree).elemtype);
             case TYPETEST:
                 return getStartPos(((JCInstanceOf) tree).expr);
             case POSTINC:
             case POSTDEC:
                 return getStartPos(((JCUnary) tree).arg);
             case NEWCLASS: {
                 JCNewClass node = (JCNewClass)tree;
                 if (node.encl != null)
                     return getStartPos(node.encl);
                 break;
             }
             case VARDEF: {
                 JCVariableDecl node = (JCVariableDecl)tree;
                 if (node.mods.pos != Position.NOPOS) {
                     return node.mods.pos;
                 } else if (node.vartype == null) {
                     //if there's no type (partially typed lambda parameter)
                     //simply return node position
                     return node.pos;
                 } else {
                     return getStartPos(node.vartype);
                 }
             }
             case 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, EndPosTable endPosTable) {
         if (tree == null)
             return Position.NOPOS;
         if (endPosTable == null) {
             // fall back on limited info in the tree
             return endPos(tree);
         }
         int mapPos = endPosTable.getEndPos(tree);
         if (mapPos != Position.NOPOS)
             return mapPos;
         switch(tree.getTag()) {
             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:
                 return getEndPos(((JCAssignOp) tree).rhs, endPosTable);
             case OR: case AND: case BITOR:
             case BITXOR: case BITAND: case EQ:
             case NE: case LT: case GT:
             case LE: case GE: case SL:
             case SR: case USR: case PLUS:
             case MINUS: case MUL: case DIV:
             case MOD:
                 return getEndPos(((JCBinary) tree).rhs, endPosTable);
             case CASE:
                 return getEndPos(((JCCase) tree).stats.last(), endPosTable);
             case CATCH:
                 return getEndPos(((JCCatch) tree).body, endPosTable);
             case CONDEXPR:
                 return getEndPos(((JCConditional) tree).falsepart, endPosTable);
             case FORLOOP:
                 return getEndPos(((JCForLoop) tree).body, endPosTable);
             case FOREACHLOOP:
                 return getEndPos(((JCEnhancedForLoop) tree).body, endPosTable);
             case IF: {
                 JCIf node = (JCIf)tree;
                 if (node.elsepart == null) {
                     return getEndPos(node.thenpart, endPosTable);
                 } else {
                     return getEndPos(node.elsepart, endPosTable);
                 }
             }
             case LABELLED:
                 return getEndPos(((JCLabeledStatement) tree).body, endPosTable);
             case MODIFIERS:
                 return getEndPos(((JCModifiers) tree).annotations.last(), endPosTable);
             case SYNCHRONIZED:
                 return getEndPos(((JCSynchronized) tree).body, endPosTable);
             case TOPLEVEL:
                 return getEndPos(((JCCompilationUnit) tree).defs.last(), endPosTable);
             case TRY: {
                 JCTry node = (JCTry)tree;
                 if (node.finalizer != null) {
                     return getEndPos(node.finalizer, endPosTable);
                 } else if (!node.catchers.isEmpty()) {
                     return getEndPos(node.catchers.last(), endPosTable);
                 } else {
                     return getEndPos(node.body, endPosTable);
                 }
             }
             case WILDCARD:
                 return getEndPos(((JCWildcard) tree).inner, endPosTable);
             case TYPECAST:
                 return getEndPos(((JCTypeCast) tree).expr, endPosTable);
             case TYPETEST:
                 return getEndPos(((JCInstanceOf) tree).clazz, endPosTable);
             case POS:
             case NEG:
             case NOT:
             case COMPL:
             case PREINC:
             case PREDEC:
                 return getEndPos(((JCUnary) tree).arg, endPosTable);
             case WHILELOOP:
                 return getEndPos(((JCWhileLoop) tree).body, endPosTable);
             case ERRONEOUS: {
                 JCErroneous node = (JCErroneous)tree;
                 if (node.errs != null && node.errs.nonEmpty())
                     return getEndPos(node.errs.last(), endPosTable);
             }
         }
         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(EndPosTable endPosTable) {
                 return TreeInfo.getEndPos(tree, endPosTable);
             }
         };
     }
     /** The position of the finalizer of given try/synchronized statement.
      */
     public static int finalizerPos(JCTree tree) {
         if (tree.hasTag(TRY)) {
             JCTry t = (JCTry) tree;
             Assert.checkNonNull(t.finalizer);
             return firstStatPos(t.finalizer);
         } else if (tree.hasTag(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);
             }
             public void visitTypeParameter(JCTypeParameter that) {
                 if (that.type != null && that.type.tsym == sym) result = that;
                 else super.visitTypeParameter(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.hasTag(LABELLED));
         switch (t.getTag()) {
         case DOLOOP: case WHILELOOP: case FORLOOP: case FOREACHLOOP: case SWITCH:
             return t;
         default:
             return tree;
         }
     }
     /** Skip parens and return the enclosed expression
      */
     public static JCExpression skipParens(JCExpression tree) {
         while (tree.hasTag(PARENS)) {
             tree = ((JCParens) tree).expr;
         }
         return tree;
     }
     /** Skip parens and return the enclosed expression
      */
     public static JCTree skipParens(JCTree tree) {
         if (tree.hasTag(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 IDENT:
             return ((JCIdent) tree).name;
         case SELECT:
             return ((JCFieldAccess) tree).name;
         case 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 IDENT:
             return ((JCIdent) tree).name;
         case 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 CLASSDEF:
             return ((JCClassDecl) node).sym;
         case METHODDEF:
             return ((JCMethodDecl) node).sym;
         case VARDEF:
             return ((JCVariableDecl) node).sym;
         default:
             return null;
         }
     }
     public static boolean isDeclaration(JCTree node) {
         node = skipParens(node);
         switch (node.getTag()) {
         case CLASSDEF:
         case METHODDEF:
         case VARDEF:
             return true;
         default:
             return false;
         }
     }
     /** 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 IDENT:
             return ((JCIdent) tree).sym;
         case SELECT:
             return ((JCFieldAccess) tree).sym;
         case 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.hasTag(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 IDENT:
             ((JCIdent) tree).sym = sym; break;
         case 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 VARDEF:
             return ((JCVariableDecl) tree).mods.flags;
         case METHODDEF:
             return ((JCMethodDecl) tree).mods.flags;
         case CLASSDEF:
             return ((JCClassDecl) tree).mods.flags;
         case 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(JCTree.Tag op) {
         switch(op) {
         case POS:
         case NEG:
         case NOT:
         case COMPL:
         case PREINC:
         case PREDEC: return prefixPrec;
         case POSTINC:
         case POSTDEC:
         case NULLCHK: return postfixPrec;
         case ASSIGN: return assignPrec;
         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: return assignopPrec;
         case OR: return orPrec;
         case AND: return andPrec;
         case EQ:
         case NE: return eqPrec;
         case LT:
         case GT:
         case LE:
         case GE: return ordPrec;
         case BITOR: return bitorPrec;
         case BITXOR: return bitxorPrec;
         case BITAND: return bitandPrec;
         case SL:
         case SR:
         case USR: return shiftPrec;
         case PLUS:
         case MINUS: return addPrec;
         case MUL:
         case DIV:
         case MOD: return mulPrec;
         case TYPETEST: return ordPrec;
         default: throw new AssertionError();
         }
     }
     static Tree.Kind tagToKind(JCTree.Tag tag) {
         switch (tag) {
         // Postfix expressions
         case POSTINC:           // _ ++
             return Tree.Kind.POSTFIX_INCREMENT;
         case POSTDEC:           // _ --
             return Tree.Kind.POSTFIX_DECREMENT;
         // Unary operators
         case PREINC:            // ++ _
             return Tree.Kind.PREFIX_INCREMENT;
         case PREDEC:            // -- _
             return Tree.Kind.PREFIX_DECREMENT;
         case POS:               // +
             return Tree.Kind.UNARY_PLUS;
         case NEG:               // -
             return Tree.Kind.UNARY_MINUS;
         case COMPL:             // ~
             return Tree.Kind.BITWISE_COMPLEMENT;
         case NOT:               // !
             return Tree.Kind.LOGICAL_COMPLEMENT;
         // Binary operators
         // Multiplicative operators
         case MUL:               // *
             return Tree.Kind.MULTIPLY;
         case DIV:               // /
             return Tree.Kind.DIVIDE;
         case MOD:               // %
             return Tree.Kind.REMAINDER;
         // Additive operators
         case PLUS:              // +
             return Tree.Kind.PLUS;
         case MINUS:             // -
             return Tree.Kind.MINUS;
         // Shift operators
         case SL:                // <<
             return Tree.Kind.LEFT_SHIFT;
         case SR:                // >>
             return Tree.Kind.RIGHT_SHIFT;
         case USR:               // >>>
             return Tree.Kind.UNSIGNED_RIGHT_SHIFT;
         // Relational operators
         case LT:                // <
             return Tree.Kind.LESS_THAN;
         case GT:                // >
             return Tree.Kind.GREATER_THAN;
         case LE:                // <=
             return Tree.Kind.LESS_THAN_EQUAL;
         case GE:                // >=
             return Tree.Kind.GREATER_THAN_EQUAL;
         // Equality operators
         case EQ:                // ==
             return Tree.Kind.EQUAL_TO;
         case NE:                // !=
             return Tree.Kind.NOT_EQUAL_TO;
         // Bitwise and logical operators
         case BITAND:            // &
             return Tree.Kind.AND;
         case BITXOR:            // ^
             return Tree.Kind.XOR;
         case BITOR:             // |
             return Tree.Kind.OR;
         // Conditional operators
         case AND:               // &&
             return Tree.Kind.CONDITIONAL_AND;
         case OR:                // ||
             return Tree.Kind.CONDITIONAL_OR;
         // Assignment operators
         case MUL_ASG:           // *=
             return Tree.Kind.MULTIPLY_ASSIGNMENT;
         case DIV_ASG:           // /=
             return Tree.Kind.DIVIDE_ASSIGNMENT;
         case MOD_ASG:           // %=
             return Tree.Kind.REMAINDER_ASSIGNMENT;
         case PLUS_ASG:          // +=
             return Tree.Kind.PLUS_ASSIGNMENT;
         case MINUS_ASG:         // -=
             return Tree.Kind.MINUS_ASSIGNMENT;
         case SL_ASG:            // <<=
             return Tree.Kind.LEFT_SHIFT_ASSIGNMENT;
         case SR_ASG:            // >>=
             return Tree.Kind.RIGHT_SHIFT_ASSIGNMENT;
         case USR_ASG:           // >>>=
             return Tree.Kind.UNSIGNED_RIGHT_SHIFT_ASSIGNMENT;
         case BITAND_ASG:        // &=
             return Tree.Kind.AND_ASSIGNMENT;
         case BITXOR_ASG:        // ^=
             return Tree.Kind.XOR_ASSIGNMENT;
         case BITOR_ASG:         // |=
             return Tree.Kind.OR_ASSIGNMENT;
         // Null check (implementation detail), for example, __.getClass()
         case NULLCHK:
             return Tree.Kind.OTHER;
         default:
             return null;
         }
     }
     /**
      * Returns the underlying type of the tree if it is annotated type,
      * or the tree itself otherwise
      */
     public static JCExpression typeIn(JCExpression tree) {
         switch (tree.getTag()) {
         case IDENT: /* simple names */
         case TYPEIDENT: /* primitive name */
         case SELECT: /* qualified name */
         case TYPEARRAY: /* array types */
         case WILDCARD: /* wild cards */
         case TYPEPARAMETER: /* type parameters */
         case TYPEAPPLY: /* parameterized types */
             return tree;
         default:
             throw new AssertionError("Unexpected type tree: " + tree);
         }
     }
     public static JCTree innermostType(JCTree type) {
         switch (type.getTag()) {
         case TYPEARRAY:
             return innermostType(((JCArrayTypeTree)type).elemtype);
         case WILDCARD:
             return innermostType(((JCWildcard)type).inner);
         default:
             return type;
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/tree/TreeInfo.java@573ceb23beeb (annotated)

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