jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/model/JavacElements.java@971c8132f5b2 (annotated)

src/share/classes/com/sun/tools/javac/model/JavacElements.java@971c8132f5b2 (annotated)

src/share/classes/com/sun/tools/javac/model/JavacElements.java

Tue, 05 Oct 2010 11:34:43 -0700

author: jjg
date: Tue, 05 Oct 2010 11:34:43 -0700
changeset 706: 971c8132f5b2
parent 581: f2fdd52e4e87
child 798: 4868a36f6fd8
permissions: -rw-r--r--

6988836: A new JavacElements is created for each round of annotation processing
Reviewed-by: darcy

 /*
  * Copyright (c) 2005, 2008, 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.model;
 import java.lang.annotation.Annotation;
 import java.lang.annotation.Inherited;
 import java.util.Map;
 import javax.lang.model.SourceVersion;
 import javax.lang.model.element.*;
 import javax.lang.model.type.DeclaredType;
 import javax.lang.model.util.Elements;
 import javax.tools.JavaFileObject;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.code.Symbol.*;
 import com.sun.tools.javac.code.TypeTags;
 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.main.JavaCompiler;
 import com.sun.tools.javac.processing.PrintingProcessor;
 import com.sun.tools.javac.tree.JCTree;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.tree.TreeInfo;
 import com.sun.tools.javac.tree.TreeScanner;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.Name;
 import static javax.lang.model.util.ElementFilter.methodsIn;
 /**
  * Utility methods for operating on program elements.
  *
  * <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>
  */
 public class JavacElements implements Elements {
     private JavaCompiler javaCompiler;
     private Symtab syms;
     private Names names;
     private Types types;
     private Enter enter;
     public static JavacElements instance(Context context) {
         JavacElements instance = context.get(JavacElements.class);
         if (instance == null)
             instance = new JavacElements(context);
         return instance;
     }
     /**
      * Public for use only by JavacProcessingEnvironment
      */
     protected JavacElements(Context context) {
         setContext(context);
     }
     /**
      * Use a new context.  May be called from outside to update
      * internal state for a new annotation-processing round.
      */
     public void setContext(Context context) {
         context.put(JavacElements.class, this);
         javaCompiler = JavaCompiler.instance(context);
         syms = Symtab.instance(context);
         names = Names.instance(context);
         types = Types.instance(context);
         enter = Enter.instance(context);
     }
     /**
      * An internal-use utility that creates a reified annotation.
      */
     public static <A extends Annotation> A getAnnotation(Symbol annotated,
                                                          Class<A> annoType) {
         if (!annoType.isAnnotation())
             throw new IllegalArgumentException("Not an annotation type: "
                                                + annoType);
         String name = annoType.getName();
         for (Attribute.Compound anno : annotated.getAnnotationMirrors())
             if (name.equals(anno.type.tsym.flatName().toString()))
                 return AnnotationProxyMaker.generateAnnotation(anno, annoType);
         return null;
     }
     /**
      * An internal-use utility that creates a reified annotation.
      * This overloaded version take annotation inheritance into account.
      */
     public static <A extends Annotation> A getAnnotation(ClassSymbol annotated,
                                                          Class<A> annoType) {
         boolean inherited = annoType.isAnnotationPresent(Inherited.class);
         A result = null;
         while (annotated.name != annotated.name.table.names.java_lang_Object) {
             result = getAnnotation((Symbol)annotated, annoType);
             if (result != null || !inherited)
                 break;
             Type sup = annotated.getSuperclass();
             if (sup.tag != TypeTags.CLASS || sup.isErroneous())
                 break;
             annotated = (ClassSymbol) sup.tsym;
         }
         return result;
     }
     public PackageSymbol getPackageElement(CharSequence name) {
         String strName = name.toString();
         if (strName.equals(""))
             return syms.unnamedPackage;
         return SourceVersion.isName(strName)
             ? nameToSymbol(strName, PackageSymbol.class)
             : null;
     }
     public ClassSymbol getTypeElement(CharSequence name) {
         String strName = name.toString();
         return SourceVersion.isName(strName)
             ? nameToSymbol(strName, ClassSymbol.class)
             : null;
     }
     /**
      * Returns a symbol given the type's or packages's canonical name,
      * or null if the name isn't found.
      */
     private <S extends Symbol> S nameToSymbol(String nameStr, Class<S> clazz) {
         Name name = names.fromString(nameStr);
         // First check cache.
         Symbol sym = (clazz == ClassSymbol.class)
                     ? syms.classes.get(name)
                     : syms.packages.get(name);
         try {
             if (sym == null)
                 sym = javaCompiler.resolveIdent(nameStr);
             sym.complete();
             return (sym.kind != Kinds.ERR &&
                     sym.exists() &&
                     clazz.isInstance(sym) &&
                     name.equals(sym.getQualifiedName()))
                 ? clazz.cast(sym)
                 : null;
         } catch (CompletionFailure e) {
             return null;
         }
     }
     public JavacSourcePosition getSourcePosition(Element e) {
         Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e);
         if (treeTop == null)
             return null;
         JCTree tree = treeTop.fst;
         JCCompilationUnit toplevel = treeTop.snd;
         JavaFileObject sourcefile = toplevel.sourcefile;
         if (sourcefile == null)
             return null;
         return new JavacSourcePosition(sourcefile, tree.pos, toplevel.lineMap);
     }
     public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a) {
         Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e);
         if (treeTop == null)
             return null;
         JCTree tree = treeTop.fst;
         JCCompilationUnit toplevel = treeTop.snd;
         JavaFileObject sourcefile = toplevel.sourcefile;
         if (sourcefile == null)
             return null;
         JCTree annoTree = matchAnnoToTree(a, e, tree);
         if (annoTree == null)
             return null;
         return new JavacSourcePosition(sourcefile, annoTree.pos,
                                        toplevel.lineMap);
     }
     public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a,
                                             AnnotationValue v) {
         // TODO: better accuracy in getSourcePosition(... AnnotationValue)
         return getSourcePosition(e, a);
     }
     /**
      * Returns the tree for an annotation given the annotated element
      * and the element's own tree.  Returns null if the tree cannot be found.
      */
     private JCTree matchAnnoToTree(AnnotationMirror findme,
                                    Element e, JCTree tree) {
         Symbol sym = cast(Symbol.class, e);
         class Vis extends JCTree.Visitor {
             List<JCAnnotation> result = null;
             public void visitTopLevel(JCCompilationUnit tree) {
                 result = tree.packageAnnotations;
             }
             public void visitClassDef(JCClassDecl tree) {
                 result = tree.mods.annotations;
             }
             public void visitMethodDef(JCMethodDecl tree) {
                 result = tree.mods.annotations;
             }
             public void visitVarDef(JCVariableDecl tree) {
                 result = tree.mods.annotations;
             }
         }
         Vis vis = new Vis();
         tree.accept(vis);
         if (vis.result == null)
             return null;
         return matchAnnoToTree(cast(Attribute.Compound.class, findme),
                                sym.getAnnotationMirrors(),
                                vis.result);
     }
     /**
      * Returns the tree for an annotation given a list of annotations
      * in which to search (recursively) and their corresponding trees.
      * Returns null if the tree cannot be found.
      */
     private JCTree matchAnnoToTree(Attribute.Compound findme,
                                    List<Attribute.Compound> annos,
                                    List<JCAnnotation> trees) {
         for (Attribute.Compound anno : annos) {
             for (JCAnnotation tree : trees) {
                 JCTree match = matchAnnoToTree(findme, anno, tree);
                 if (match != null)
                     return match;
             }
         }
         return null;
     }
     /**
      * Returns the tree for an annotation given an Attribute to
      * search (recursively) and its corresponding tree.
      * Returns null if the tree cannot be found.
      */
     private JCTree matchAnnoToTree(final Attribute.Compound findme,
                                    final Attribute attr,
                                    final JCTree tree) {
         if (attr == findme)
             return (tree.type.tsym == findme.type.tsym) ? tree : null;
         class Vis implements Attribute.Visitor {
             JCTree result = null;
             public void visitConstant(Attribute.Constant value) {
             }
             public void visitClass(Attribute.Class clazz) {
             }
             public void visitCompound(Attribute.Compound anno) {
                 for (Pair<MethodSymbol, Attribute> pair : anno.values) {
                     JCExpression expr = scanForAssign(pair.fst, tree);
                     if (expr != null) {
                         JCTree match = matchAnnoToTree(findme, pair.snd, expr);
                         if (match != null) {
                             result = match;
                             return;
                         }
                     }
                 }
             }
             public void visitArray(Attribute.Array array) {
                 if (tree.getTag() == JCTree.NEWARRAY &&
                         types.elemtype(array.type).tsym == findme.type.tsym) {
                     List<JCExpression> elems = ((JCNewArray) tree).elems;
                     for (Attribute value : array.values) {
                         if (value == findme) {
                             result = elems.head;
                             return;
                         }
                         elems = elems.tail;
                     }
                 }
             }
             public void visitEnum(Attribute.Enum e) {
             }
             public void visitError(Attribute.Error e) {
             }
         }
         Vis vis = new Vis();
         attr.accept(vis);
         return vis.result;
     }
     /**
      * Scans for a JCAssign node with a LHS matching a given
      * symbol, and returns its RHS.  Does not scan nested JCAnnotations.
      */
     private JCExpression scanForAssign(final MethodSymbol sym,
                                        final JCTree tree) {
         class TS extends TreeScanner {
             JCExpression result = null;
             public void scan(JCTree t) {
                 if (t != null && result == null)
                     t.accept(this);
             }
             public void visitAnnotation(JCAnnotation t) {
                 if (t == tree)
                     scan(t.args);
             }
             public void visitAssign(JCAssign t) {
                 if (t.lhs.getTag() == JCTree.IDENT) {
                     JCIdent ident = (JCIdent) t.lhs;
                     if (ident.sym == sym)
                         result = t.rhs;
                 }
             }
         }
         TS scanner = new TS();
         tree.accept(scanner);
         return scanner.result;
     }
     /**
      * Returns the tree node corresponding to this element, or null
      * if none can be found.
      */
     public JCTree getTree(Element e) {
         Pair<JCTree, ?> treeTop = getTreeAndTopLevel(e);
         return (treeTop != null) ? treeTop.fst : null;
     }
     public String getDocComment(Element e) {
         // Our doc comment is contained in a map in our toplevel,
         // indexed by our tree.  Find our enter environment, which gives
         // us our toplevel.  It also gives us a tree that contains our
         // tree:  walk it to find our tree.  This is painful.
         Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e);
         if (treeTop == null)
             return null;
         JCTree tree = treeTop.fst;
         JCCompilationUnit toplevel = treeTop.snd;
         if (toplevel.docComments == null)
             return null;
         return toplevel.docComments.get(tree);
     }
     public PackageElement getPackageOf(Element e) {
         return cast(Symbol.class, e).packge();
     }
     public boolean isDeprecated(Element e) {
         Symbol sym = cast(Symbol.class, e);
         return (sym.flags() & Flags.DEPRECATED) != 0;
     }
     public Name getBinaryName(TypeElement type) {
         return cast(TypeSymbol.class, type).flatName();
     }
     public Map<MethodSymbol, Attribute> getElementValuesWithDefaults(
                                                         AnnotationMirror a) {
         Attribute.Compound anno = cast(Attribute.Compound.class, a);
         DeclaredType annotype = a.getAnnotationType();
         Map<MethodSymbol, Attribute> valmap = anno.getElementValues();
         for (ExecutableElement ex :
                  methodsIn(annotype.asElement().getEnclosedElements())) {
             MethodSymbol meth = (MethodSymbol) ex;
             Attribute defaultValue = meth.getDefaultValue();
             if (defaultValue != null && !valmap.containsKey(meth)) {
                 valmap.put(meth, defaultValue);
             }
         }
         return valmap;
     }
     /**
      * {@inheritDoc}
      */
     public FilteredMemberList getAllMembers(TypeElement element) {
         Symbol sym = cast(Symbol.class, element);
         Scope scope = sym.members().dupUnshared();
         List<Type> closure = types.closure(sym.asType());
         for (Type t : closure)
             addMembers(scope, t);
         return new FilteredMemberList(scope);
     }
     // where
         private void addMembers(Scope scope, Type type) {
             members:
             for (Scope.Entry e = type.asElement().members().elems; e != null; e = e.sibling) {
                 Scope.Entry overrider = scope.lookup(e.sym.getSimpleName());
                 while (overrider.scope != null) {
                     if (overrider.sym.kind == e.sym.kind
                         && (overrider.sym.flags() & Flags.SYNTHETIC) == 0)
                     {
                         if (overrider.sym.getKind() == ElementKind.METHOD
                         && overrides((ExecutableElement)overrider.sym, (ExecutableElement)e.sym, (TypeElement)type.asElement())) {
                             continue members;
                         }
                     }
                     overrider = overrider.next();
                 }
                 boolean derived = e.sym.getEnclosingElement() != scope.owner;
                 ElementKind kind = e.sym.getKind();
                 boolean initializer = kind == ElementKind.CONSTRUCTOR
                     || kind == ElementKind.INSTANCE_INIT
                     || kind == ElementKind.STATIC_INIT;
                 if (!derived || (!initializer && e.sym.isInheritedIn(scope.owner, types)))
                     scope.enter(e.sym);
             }
         }
     /**
      * Returns all annotations of an element, whether
      * inherited or directly present.
      *
      * @param e  the element being examined
      * @return all annotations of the element
      */
     public List<Attribute.Compound> getAllAnnotationMirrors(Element e) {
         Symbol sym = cast(Symbol.class, e);
         List<Attribute.Compound> annos = sym.getAnnotationMirrors();
         while (sym.getKind() == ElementKind.CLASS) {
             Type sup = ((ClassSymbol) sym).getSuperclass();
             if (sup.tag != TypeTags.CLASS || sup.isErroneous() ||
                     sup.tsym == syms.objectType.tsym) {
                 break;
             }
             sym = sup.tsym;
             List<Attribute.Compound> oldAnnos = annos;
             for (Attribute.Compound anno : sym.getAnnotationMirrors()) {
                 if (isInherited(anno.type) &&
                         !containsAnnoOfType(oldAnnos, anno.type)) {
                     annos = annos.prepend(anno);
                 }
             }
         }
         return annos;
     }
     /**
      * Tests whether an annotation type is @Inherited.
      */
     private boolean isInherited(Type annotype) {
         for (Attribute.Compound anno : annotype.tsym.getAnnotationMirrors()) {
             if (anno.type.tsym == syms.inheritedType.tsym)
                 return true;
         }
         return false;
     }
     /**
      * Tests whether a list of annotations contains an annotation
      * of a given type.
      */
     private static boolean containsAnnoOfType(List<Attribute.Compound> annos,
                                               Type type) {
         for (Attribute.Compound anno : annos) {
             if (anno.type.tsym == type.tsym)
                 return true;
         }
         return false;
     }
     public boolean hides(Element hiderEl, Element hideeEl) {
         Symbol hider = cast(Symbol.class, hiderEl);
         Symbol hidee = cast(Symbol.class, hideeEl);
         // Fields only hide fields; methods only methods; types only types.
         // Names must match.  Nothing hides itself (just try it).
         if (hider == hidee ||
                 hider.kind != hidee.kind ||
                 hider.name != hidee.name) {
             return false;
         }
         // Only static methods can hide other methods.
         // Methods only hide methods with matching signatures.
         if (hider.kind == Kinds.MTH) {
             if (!hider.isStatic() ||
                         !types.isSubSignature(hider.type, hidee.type)) {
                 return false;
             }
         }
         // Hider must be in a subclass of hidee's class.
         // Note that if M1 hides M2, and M2 hides M3, and M3 is accessible
         // in M1's class, then M1 and M2 both hide M3.
         ClassSymbol hiderClass = hider.owner.enclClass();
         ClassSymbol hideeClass = hidee.owner.enclClass();
         if (hiderClass == null || hideeClass == null ||
                 !hiderClass.isSubClass(hideeClass, types)) {
             return false;
         }
         // Hidee must be accessible in hider's class.
         // The method isInheritedIn is poorly named:  it checks only access.
         return hidee.isInheritedIn(hiderClass, types);
     }
     public boolean overrides(ExecutableElement riderEl,
                              ExecutableElement rideeEl, TypeElement typeEl) {
         MethodSymbol rider = cast(MethodSymbol.class, riderEl);
         MethodSymbol ridee = cast(MethodSymbol.class, rideeEl);
         ClassSymbol origin = cast(ClassSymbol.class, typeEl);
         return rider.name == ridee.name &&
                // not reflexive as per JLS
                rider != ridee &&
                // we don't care if ridee is static, though that wouldn't
                // compile
                !rider.isStatic() &&
                // Symbol.overrides assumes the following
                ridee.isMemberOf(origin, types) &&
                // check access and signatures; don't check return types
                rider.overrides(ridee, origin, types, false);
     }
     public String getConstantExpression(Object value) {
         return Constants.format(value);
     }
     /**
      * Print a representation of the elements to the given writer in
      * the specified order.  The main purpose of this method is for
      * diagnostics.  The exact format of the output is <em>not</em>
      * specified and is subject to change.
      *
      * @param w the writer to print the output to
      * @param elements the elements to print
      */
     public void printElements(java.io.Writer w, Element... elements) {
         for (Element element : elements)
             (new PrintingProcessor.PrintingElementVisitor(w, this)).visit(element).flush();
     }
     public Name getName(CharSequence cs) {
         return names.fromString(cs.toString());
     }
     /**
      * Returns the tree node and compilation unit corresponding to this
      * element, or null if they can't be found.
      */
     private Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel(Element e) {
         Symbol sym = cast(Symbol.class, e);
         Env<AttrContext> enterEnv = getEnterEnv(sym);
         if (enterEnv == null)
             return null;
         JCTree tree = TreeInfo.declarationFor(sym, enterEnv.tree);
         if (tree == null || enterEnv.toplevel == null)
             return null;
         return new Pair<JCTree,JCCompilationUnit>(tree, enterEnv.toplevel);
     }
     /**
      * Returns the best approximation for the tree node and compilation unit
      * corresponding to the given element, annotation and value.
      * If the element is null, null is returned.
      * If the annotation is null or cannot be found, the tree node and
      * compilation unit for the element is returned.
      * If the annotation value is null or cannot be found, the tree node and
      * compilation unit for the annotation is returned.
      */
     public Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel(
                       Element e, AnnotationMirror a, AnnotationValue v) {
         if (e == null)
             return null;
         Pair<JCTree, JCCompilationUnit> elemTreeTop = getTreeAndTopLevel(e);
         if (elemTreeTop == null)
             return null;
         if (a == null)
             return elemTreeTop;
         JCTree annoTree = matchAnnoToTree(a, e, elemTreeTop.fst);
         if (annoTree == null)
             return elemTreeTop;
         // 6388543: if v != null, we should search within annoTree to find
         // the tree matching v. For now, we ignore v and return the tree of
         // the annotation.
         return new Pair<JCTree, JCCompilationUnit>(annoTree, elemTreeTop.snd);
     }
     /**
      * Returns a symbol's enter environment, or null if it has none.
      */
     private Env<AttrContext> getEnterEnv(Symbol sym) {
         // Get enclosing class of sym, or sym itself if it is a class
         // or package.
         TypeSymbol ts = (sym.kind != Kinds.PCK)
                         ? sym.enclClass()
                         : (PackageSymbol) sym;
         return (ts != null)
                 ? enter.getEnv(ts)
                 : null;
     }
     /**
      * Returns an object cast to the specified type.
      * @throws NullPointerException if the object is {@code null}
      * @throws IllegalArgumentException if the object is of the wrong type
      */
     private static <T> T cast(Class<T> clazz, Object o) {
         if (! clazz.isInstance(o))
             throw new IllegalArgumentException(o.toString());
         return clazz.cast(o);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/model/JavacElements.java@971c8132f5b2 (annotated)

src/share/classes/com/sun/tools/javac/model/JavacElements.java