jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/api/JavacTrees.java@7ae6c0fd479b (annotated)

src/share/classes/com/sun/tools/javac/api/JavacTrees.java@7ae6c0fd479b (annotated)

src/share/classes/com/sun/tools/javac/api/JavacTrees.java

Thu, 28 Apr 2011 15:05:36 -0700

author: jjg
date: Thu, 28 Apr 2011 15:05:36 -0700
changeset 988: 7ae6c0fd479b
parent 783: 90914ac50868
child 1090: 1807fc3fd33c
permissions: -rw-r--r--

7029150: Project Coin: present union types from the tree API through to javax.lang.model
Reviewed-by: mcimadamore

 /*
  * Copyright (c) 2005, 2011, 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.api;
 import java.io.IOException;
 import java.util.Map;
 import javax.annotation.processing.ProcessingEnvironment;
 import javax.lang.model.element.AnnotationMirror;
 import javax.lang.model.element.AnnotationValue;
 import javax.lang.model.element.Element;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.TypeElement;
 import javax.lang.model.type.DeclaredType;
 import javax.lang.model.type.TypeKind;
 import javax.lang.model.type.TypeMirror;
 import javax.tools.Diagnostic;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaFileObject;
 import com.sun.source.tree.CatchTree;
 import com.sun.source.tree.CompilationUnitTree;
 import com.sun.source.tree.Scope;
 import com.sun.source.tree.Tree;
 import com.sun.source.util.SourcePositions;
 import com.sun.source.util.TreePath;
 import com.sun.source.util.Trees;
 import com.sun.tools.javac.code.Flags;
 import com.sun.tools.javac.code.Symbol.ClassSymbol;
 import com.sun.tools.javac.code.Symbol.TypeSymbol;
 import com.sun.tools.javac.code.Symbol;
 import com.sun.tools.javac.code.Type.UnionClassType;
 import com.sun.tools.javac.comp.Attr;
 import com.sun.tools.javac.comp.AttrContext;
 import com.sun.tools.javac.comp.Enter;
 import com.sun.tools.javac.comp.Env;
 import com.sun.tools.javac.comp.MemberEnter;
 import com.sun.tools.javac.comp.Resolve;
 import com.sun.tools.javac.model.JavacElements;
 import com.sun.tools.javac.processing.JavacProcessingEnvironment;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.tree.JCTree;
 import com.sun.tools.javac.tree.TreeCopier;
 import com.sun.tools.javac.tree.TreeInfo;
 import com.sun.tools.javac.tree.TreeMaker;
 import com.sun.tools.javac.util.Context;
 import com.sun.tools.javac.util.JCDiagnostic;
 import com.sun.tools.javac.util.List;
 import com.sun.tools.javac.util.Log;
 import com.sun.tools.javac.util.Pair;
 /**
  * Provides an implementation of 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></p>
  *
  * @author Peter von der Ah&eacute;
  */
 public class JavacTrees extends Trees {
     // in a world of a single context per compilation, these would all be final
     private Resolve resolve;
     private Enter enter;
     private Log log;
     private MemberEnter memberEnter;
     private Attr attr;
     private TreeMaker treeMaker;
     private JavacElements elements;
     private JavacTaskImpl javacTaskImpl;
     public static JavacTrees instance(JavaCompiler.CompilationTask task) {
         if (!(task instanceof JavacTaskImpl))
             throw new IllegalArgumentException();
         return instance(((JavacTaskImpl)task).getContext());
     }
     public static JavacTrees instance(ProcessingEnvironment env) {
         if (!(env instanceof JavacProcessingEnvironment))
             throw new IllegalArgumentException();
         return instance(((JavacProcessingEnvironment)env).getContext());
     }
     public static JavacTrees instance(Context context) {
         JavacTrees instance = context.get(JavacTrees.class);
         if (instance == null)
             instance = new JavacTrees(context);
         return instance;
     }
     private JavacTrees(Context context) {
         context.put(JavacTrees.class, this);
         init(context);
     }
     public void updateContext(Context context) {
         init(context);
     }
     private void init(Context context) {
         attr = Attr.instance(context);
         enter = Enter.instance(context);
         elements = JavacElements.instance(context);
         log = Log.instance(context);
         resolve = Resolve.instance(context);
         treeMaker = TreeMaker.instance(context);
         memberEnter = MemberEnter.instance(context);
         javacTaskImpl = context.get(JavacTaskImpl.class);
     }
     public SourcePositions getSourcePositions() {
         return new SourcePositions() {
                 public long getStartPosition(CompilationUnitTree file, Tree tree) {
                     return TreeInfo.getStartPos((JCTree) tree);
                 }
                 public long getEndPosition(CompilationUnitTree file, Tree tree) {
                     Map<JCTree,Integer> endPositions = ((JCCompilationUnit) file).endPositions;
                     return TreeInfo.getEndPos((JCTree) tree, endPositions);
                 }
             };
     }
     public JCClassDecl getTree(TypeElement element) {
         return (JCClassDecl) getTree((Element) element);
     }
     public JCMethodDecl getTree(ExecutableElement method) {
         return (JCMethodDecl) getTree((Element) method);
     }
     public JCTree getTree(Element element) {
         Symbol symbol = (Symbol) element;
         TypeSymbol enclosing = symbol.enclClass();
         Env<AttrContext> env = enter.getEnv(enclosing);
         if (env == null)
             return null;
         JCClassDecl classNode = env.enclClass;
         if (classNode != null) {
             if (TreeInfo.symbolFor(classNode) == element)
                 return classNode;
             for (JCTree node : classNode.getMembers())
                 if (TreeInfo.symbolFor(node) == element)
                     return node;
         }
         return null;
     }
     public JCTree getTree(Element e, AnnotationMirror a) {
         return getTree(e, a, null);
     }
     public JCTree getTree(Element e, AnnotationMirror a, AnnotationValue v) {
         Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
         if (treeTopLevel == null)
             return null;
         return treeTopLevel.fst;
     }
     public TreePath getPath(CompilationUnitTree unit, Tree node) {
         return TreePath.getPath(unit, node);
     }
     public TreePath getPath(Element e) {
         return getPath(e, null, null);
     }
     public TreePath getPath(Element e, AnnotationMirror a) {
         return getPath(e, a, null);
     }
     public TreePath getPath(Element e, AnnotationMirror a, AnnotationValue v) {
         final Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
         if (treeTopLevel == null)
             return null;
         return TreePath.getPath(treeTopLevel.snd, treeTopLevel.fst);
     }
     public Element getElement(TreePath path) {
         JCTree tree = (JCTree) path.getLeaf();
         Symbol sym = TreeInfo.symbolFor(tree);
         if (sym == null && TreeInfo.isDeclaration(tree)) {
             for (TreePath p = path; p != null; p = p.getParentPath()) {
                 JCTree t = (JCTree) p.getLeaf();
                 if (t.getTag() == JCTree.CLASSDEF) {
                     JCClassDecl ct = (JCClassDecl) t;
                     if (ct.sym != null) {
                         if ((ct.sym.flags_field & Flags.UNATTRIBUTED) != 0) {
                             attr.attribClass(ct.pos(), ct.sym);
                             sym = TreeInfo.symbolFor(tree);
                         }
                         break;
                     }
                 }
             }
         }
         return sym;
     }
     public TypeMirror getTypeMirror(TreePath path) {
         Tree t = path.getLeaf();
         return ((JCTree)t).type;
     }
     public JavacScope getScope(TreePath path) {
         return new JavacScope(getAttrContext(path));
     }
     public String getDocComment(TreePath path) {
         CompilationUnitTree t = path.getCompilationUnit();
         if (t instanceof JCTree.JCCompilationUnit) {
             JCCompilationUnit cu = (JCCompilationUnit) t;
             if (cu.docComments != null) {
                 return cu.docComments.get(path.getLeaf());
             }
         }
         return null;
     }
     public boolean isAccessible(Scope scope, TypeElement type) {
         if (scope instanceof JavacScope && type instanceof ClassSymbol) {
             Env<AttrContext> env = ((JavacScope) scope).env;
             return resolve.isAccessible(env, (ClassSymbol)type, true);
         } else
             return false;
     }
     public boolean isAccessible(Scope scope, Element member, DeclaredType type) {
         if (scope instanceof JavacScope
                 && member instanceof Symbol
                 && type instanceof com.sun.tools.javac.code.Type) {
             Env<AttrContext> env = ((JavacScope) scope).env;
             return resolve.isAccessible(env, (com.sun.tools.javac.code.Type)type, (Symbol)member, true);
         } else
             return false;
     }
     private Env<AttrContext> getAttrContext(TreePath path) {
         if (!(path.getLeaf() instanceof JCTree))  // implicit null-check
             throw new IllegalArgumentException();
         // if we're being invoked via from a JSR199 client, we need to make sure
         // all the classes have been entered; if we're being invoked from JSR269,
         // then the classes will already have been entered.
         if (javacTaskImpl != null) {
             try {
                 javacTaskImpl.enter(null);
             } catch (IOException e) {
                 throw new Error("unexpected error while entering symbols: " + e);
             }
         }
         JCCompilationUnit unit = (JCCompilationUnit) path.getCompilationUnit();
         Copier copier = new Copier(treeMaker.forToplevel(unit));
         Env<AttrContext> env = null;
         JCMethodDecl method = null;
         JCVariableDecl field = null;
         List<Tree> l = List.nil();
         TreePath p = path;
         while (p != null) {
             l = l.prepend(p.getLeaf());
             p = p.getParentPath();
         }
         for ( ; l.nonEmpty(); l = l.tail) {
             Tree tree = l.head;
             switch (tree.getKind()) {
                 case COMPILATION_UNIT:
 //                    System.err.println("COMP: " + ((JCCompilationUnit)tree).sourcefile);
                     env = enter.getTopLevelEnv((JCCompilationUnit)tree);
                     break;
                 case ANNOTATION_TYPE:
                 case CLASS:
                 case ENUM:
                 case INTERFACE:
 //                    System.err.println("CLASS: " + ((JCClassDecl)tree).sym.getSimpleName());
                     env = enter.getClassEnv(((JCClassDecl)tree).sym);
                     break;
                 case METHOD:
 //                    System.err.println("METHOD: " + ((JCMethodDecl)tree).sym.getSimpleName());
                     method = (JCMethodDecl)tree;
                     break;
                 case VARIABLE:
 //                    System.err.println("FIELD: " + ((JCVariableDecl)tree).sym.getSimpleName());
                     field = (JCVariableDecl)tree;
                     break;
                 case BLOCK: {
 //                    System.err.println("BLOCK: ");
                     if (method != null)
                         env = memberEnter.getMethodEnv(method, env);
                     JCTree body = copier.copy((JCTree)tree, (JCTree) path.getLeaf());
                     env = attribStatToTree(body, env, copier.leafCopy);
                     return env;
                 }
                 default:
 //                    System.err.println("DEFAULT: " + tree.getKind());
                     if (field != null && field.getInitializer() == tree) {
                         env = memberEnter.getInitEnv(field, env);
                         JCExpression expr = copier.copy((JCExpression)tree, (JCTree) path.getLeaf());
                         env = attribExprToTree(expr, env, copier.leafCopy);
                         return env;
                     }
             }
         }
         return field != null ? memberEnter.getInitEnv(field, env) : env;
     }
     private Env<AttrContext> attribStatToTree(JCTree stat, Env<AttrContext>env, JCTree tree) {
         JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
         try {
             return attr.attribStatToTree(stat, env, tree);
         } finally {
             log.useSource(prev);
         }
     }
     private Env<AttrContext> attribExprToTree(JCExpression expr, Env<AttrContext>env, JCTree tree) {
         JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
         try {
             return attr.attribExprToTree(expr, env, tree);
         } finally {
             log.useSource(prev);
         }
     }
     /**
      * Makes a copy of a tree, noting the value resulting from copying a particular leaf.
      **/
     static class Copier extends TreeCopier<JCTree> {
         JCTree leafCopy = null;
         Copier(TreeMaker M) {
             super(M);
         }
         @Override
         public <T extends JCTree> T copy(T t, JCTree leaf) {
             T t2 = super.copy(t, leaf);
             if (t == leaf)
                 leafCopy = t2;
             return t2;
         }
     }
     /**
      * Gets the original type from the ErrorType object.
      * @param errorType The errorType for which we want to get the original type.
      * @returns TypeMirror corresponding to the original type, replaced by the ErrorType.
      *          noType (type.tag == NONE) is returned if there is no original type.
      */
     public TypeMirror getOriginalType(javax.lang.model.type.ErrorType errorType) {
         if (errorType instanceof com.sun.tools.javac.code.Type.ErrorType) {
             return ((com.sun.tools.javac.code.Type.ErrorType)errorType).getOriginalType();
         }
         return com.sun.tools.javac.code.Type.noType;
     }
     /**
      * Prints a message of the specified kind at the location of the
      * tree within the provided compilation unit
      *
      * @param kind the kind of message
      * @param msg  the message, or an empty string if none
      * @param t    the tree to use as a position hint
      * @param root the compilation unit that contains tree
      */
     public void printMessage(Diagnostic.Kind kind, CharSequence msg,
             com.sun.source.tree.Tree t,
             com.sun.source.tree.CompilationUnitTree root) {
         JavaFileObject oldSource = null;
         JavaFileObject newSource = null;
         JCDiagnostic.DiagnosticPosition pos = null;
         newSource = root.getSourceFile();
         if (newSource != null) {
             oldSource = log.useSource(newSource);
             pos = ((JCTree) t).pos();
         }
         try {
             switch (kind) {
             case ERROR:
                 boolean prev = log.multipleErrors;
                 try {
                     log.error(pos, "proc.messager", msg.toString());
                 } finally {
                     log.multipleErrors = prev;
                 }
                 break;
             case WARNING:
                 log.warning(pos, "proc.messager", msg.toString());
                 break;
             case MANDATORY_WARNING:
                 log.mandatoryWarning(pos, "proc.messager", msg.toString());
                 break;
             default:
                 log.note(pos, "proc.messager", msg.toString());
             }
         } finally {
             if (oldSource != null)
                 log.useSource(oldSource);
         }
     }
     @Override
     public TypeMirror getLub(CatchTree tree) {
         JCCatch ct = (JCCatch) tree;
         JCVariableDecl v = ct.param;
         if (v.type != null && v.type.getKind() == TypeKind.UNION) {
             UnionClassType ut = (UnionClassType) v.type;
             return ut.getLub();
         } else {
             return v.type;
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/api/JavacTrees.java@7ae6c0fd479b (annotated)

src/share/classes/com/sun/tools/javac/api/JavacTrees.java