Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2005, 2013, 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.File;

 import java.io.IOException;

 import java.nio.CharBuffer;

 import java.util.*;

 import java.util.concurrent.atomic.AtomicBoolean;

 import javax.annotation.processing.Processor;

 import javax.lang.model.element.Element;

 import javax.lang.model.element.TypeElement;

 import javax.lang.model.type.TypeMirror;

 import javax.tools.*;

 import com.sun.source.tree.*;

 import com.sun.source.util.*;

 import com.sun.tools.javac.code.*;

 import com.sun.tools.javac.code.Symbol.*;

 import com.sun.tools.javac.comp.*;

 import com.sun.tools.javac.file.JavacFileManager;

 import com.sun.tools.javac.main.*;

 import com.sun.tools.javac.main.JavaCompiler;

 import com.sun.tools.javac.model.*;

 import com.sun.tools.javac.parser.Parser;

 import com.sun.tools.javac.parser.ParserFactory;

 import com.sun.tools.javac.tree.*;

 import com.sun.tools.javac.tree.JCTree.*;

 import com.sun.tools.javac.util.*;

 import com.sun.tools.javac.util.List;

 /**

  * Provides access to functionality specific to the JDK Java Compiler, javac.

  *

  * <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 Ahé

  * @author Jonathan Gibbons

  */

 public class JavacTaskImpl extends BasicJavacTask {

     private Main compilerMain;

     private JavaCompiler compiler;

     private Locale locale;

     private String[] args;

     private String[] classNames;

     private List<JavaFileObject> fileObjects;

     private Map<JavaFileObject, JCCompilationUnit> notYetEntered;

     private ListBuffer<Env<AttrContext>> genList;

     private final AtomicBoolean used = new AtomicBoolean();

     private Iterable<? extends Processor> processors;

     private Main.Result result = null;

     JavacTaskImpl(Main compilerMain,

                 String[] args,

                 String[] classNames,

                 Context context,

                 List<JavaFileObject> fileObjects) {

         super(null, false);

         this.compilerMain = compilerMain;

         this.args = args;

         this.classNames = classNames;

         this.context = context;

         this.fileObjects = fileObjects;

         setLocale(Locale.getDefault());

         // null checks

         compilerMain.getClass();

         args.getClass();

         fileObjects.getClass();

     }

     JavacTaskImpl(Main compilerMain,

                 Iterable<String> args,

                 Context context,

                 Iterable<String> classes,

                 Iterable<? extends JavaFileObject> fileObjects) {

         this(compilerMain, toArray(args), toArray(classes), context, toList(fileObjects));

     }

     static private String[] toArray(Iterable<String> iter) {

         ListBuffer<String> result = new ListBuffer<String>();

         if (iter != null)

             for (String s : iter)

                 result.append(s);

         return result.toArray(new String[result.length()]);

     }

     static private List<JavaFileObject> toList(Iterable<? extends JavaFileObject> fileObjects) {

         if (fileObjects == null)

             return List.nil();

         ListBuffer<JavaFileObject> result = new ListBuffer<JavaFileObject>();

         for (JavaFileObject fo : fileObjects)

             result.append(fo);

         return result.toList();

     }

     public Main.Result doCall() {

         if (!used.getAndSet(true)) {

             initContext();

             notYetEntered = new HashMap<JavaFileObject, JCCompilationUnit>();

             compilerMain.setAPIMode(true);

             result = compilerMain.compile(args, classNames, context, fileObjects, processors);

             cleanup();

             return result;

         } else {

             throw new IllegalStateException("multiple calls to method 'call'");

         }

     }

     public Boolean call() {

         return doCall().isOK();

     }

     public void setProcessors(Iterable<? extends Processor> processors) {

         processors.getClass(); // null check

         // not mt-safe

         if (used.get())

             throw new IllegalStateException();

         this.processors = processors;

     }

     public void setLocale(Locale locale) {

         if (used.get())

             throw new IllegalStateException();

         this.locale = locale;

     }

     private void prepareCompiler() throws IOException {

         if (used.getAndSet(true)) {

             if (compiler == null)

                 throw new IllegalStateException();

         } else {

             initContext();

             compilerMain.log = Log.instance(context);

             compilerMain.setOptions(Options.instance(context));

             compilerMain.filenames = new LinkedHashSet<File>();

             Collection<File> filenames = compilerMain.processArgs(CommandLine.parse(args), classNames);

             if (filenames != null && !filenames.isEmpty())

                 throw new IllegalArgumentException("Malformed arguments " + toString(filenames, " "));

             compiler = JavaCompiler.instance(context);

             compiler.keepComments = true;

             compiler.genEndPos = true;

             // NOTE: this value will be updated after annotation processing

             compiler.initProcessAnnotations(processors);

             notYetEntered = new HashMap<JavaFileObject, JCCompilationUnit>();

             for (JavaFileObject file: fileObjects)

                 notYetEntered.put(file, null);

             genList = new ListBuffer<Env<AttrContext>>();

             // endContext will be called when all classes have been generated

             // TODO: should handle the case after each phase if errors have occurred

             args = null;

             classNames = null;

         }

     }

     <T> String toString(Iterable<T> items, String sep) {

         String currSep = "";

         StringBuilder sb = new StringBuilder();

         for (T item: items) {

             sb.append(currSep);

             sb.append(item.toString());

             currSep = sep;

         }

         return sb.toString();

     }

     private void initContext() {

         context.put(JavacTask.class, this);

         //initialize compiler's default locale

         context.put(Locale.class, locale);

     }

     void cleanup() {

         if (compiler != null)

             compiler.close();

         compiler = null;

         compilerMain = null;

         args = null;

         classNames = null;

         context = null;

         fileObjects = null;

         notYetEntered = null;

     }

     /**

      * Construct a JavaFileObject from the given file.

      *

      * <p><b>TODO: this method is useless here</b></p>

      *

      * @param file a file

      * @return a JavaFileObject from the standard file manager.

      */

     public JavaFileObject asJavaFileObject(File file) {

         JavacFileManager fm = (JavacFileManager)context.get(JavaFileManager.class);

         return fm.getRegularFile(file);

     }

     /**

      * Parse the specified files returning a list of abstract syntax trees.

      *

      * @throws java.io.IOException TODO

      * @return a list of abstract syntax trees

      */

     public Iterable<? extends CompilationUnitTree> parse() throws IOException {

         try {

             prepareCompiler();

             List<JCCompilationUnit> units = compiler.parseFiles(fileObjects);

             for (JCCompilationUnit unit: units) {

                 JavaFileObject file = unit.getSourceFile();

                 if (notYetEntered.containsKey(file))

                     notYetEntered.put(file, unit);

             }

             return units;

         }

         finally {

             parsed = true;

             if (compiler != null && compiler.log != null)

                 compiler.log.flush();

         }

     }

     private boolean parsed = false;

     /**

      * Translate all the abstract syntax trees to elements.

      *

      * @throws IOException TODO

      * @return a list of elements corresponding to the top level

      * classes in the abstract syntax trees

      */

     public Iterable<? extends TypeElement> enter() throws IOException {

         return enter(null);

     }

     /**

      * Translate the given abstract syntax trees to elements.

      *

      * @param trees a list of abstract syntax trees.

      * @throws java.io.IOException TODO

      * @return a list of elements corresponding to the top level

      * classes in the abstract syntax trees

      */

     public Iterable<? extends TypeElement> enter(Iterable<? extends CompilationUnitTree> trees)

         throws IOException

     {

         if (trees == null && notYetEntered != null && notYetEntered.isEmpty())

             return List.nil();

         prepareCompiler();

         ListBuffer<JCCompilationUnit> roots = null;

         if (trees == null) {

             // If there are still files which were specified to be compiled

             // (i.e. in fileObjects) but which have not yet been entered,

             // then we make sure they have been parsed and add them to the

             // list to be entered.

             if (notYetEntered.size() > 0) {

                 if (!parsed)

                     parse(); // TODO would be nice to specify files needed to be parsed

                 for (JavaFileObject file: fileObjects) {

                     JCCompilationUnit unit = notYetEntered.remove(file);

                     if (unit != null) {

                         if (roots == null)

                             roots = new ListBuffer<JCCompilationUnit>();

                         roots.append(unit);

                     }

                 }

                 notYetEntered.clear();

             }

         }

         else {

             for (CompilationUnitTree cu : trees) {

                 if (cu instanceof JCCompilationUnit) {

                     if (roots == null)

                         roots = new ListBuffer<JCCompilationUnit>();

                     roots.append((JCCompilationUnit)cu);

                     notYetEntered.remove(cu.getSourceFile());

                 }

                 else

                     throw new IllegalArgumentException(cu.toString());

             }

         }

         if (roots == null)

             return List.nil();

         try {

             List<JCCompilationUnit> units = compiler.enterTrees(roots.toList());

             if (notYetEntered.isEmpty())

                 compiler = compiler.processAnnotations(units);

             ListBuffer<TypeElement> elements = new ListBuffer<TypeElement>();

             for (JCCompilationUnit unit : units) {

                 for (JCTree node : unit.defs) {

                     if (node.hasTag(JCTree.Tag.CLASSDEF)) {

                         JCClassDecl cdef = (JCClassDecl) node;

                         if (cdef.sym != null) // maybe null if errors in anno processing

                             elements.append(cdef.sym);

                     }

                 }

             }

             return elements.toList();

         }

         finally {

             compiler.log.flush();

         }

     }

     /**

      * Complete all analysis.

      * @throws IOException TODO

      */

     @Override

     public Iterable<? extends Element> analyze() throws IOException {

         return analyze(null);

     }

     /**

      * Complete all analysis on the given classes.

      * This can be used to ensure that all compile time errors are reported.

      * The classes must have previously been returned from {@link #enter}.

      * If null is specified, all outstanding classes will be analyzed.

      *

      * @param classes a list of class elements

      */

     // This implementation requires that we open up privileges on JavaCompiler.

     // An alternative implementation would be to move this code to JavaCompiler and

     // wrap it here

     public Iterable<? extends Element> analyze(Iterable<? extends TypeElement> classes) throws IOException {

         enter(null);  // ensure all classes have been entered

         final ListBuffer<Element> results = new ListBuffer<Element>();

         try {

             if (classes == null) {

                 handleFlowResults(compiler.flow(compiler.attribute(compiler.todo)), results);

             } else {

                 Filter f = new Filter() {

                     public void process(Env<AttrContext> env) {

                         handleFlowResults(compiler.flow(compiler.attribute(env)), results);

                     }

                 };

                 f.run(compiler.todo, classes);

             }

         } finally {

             compiler.log.flush();

         }

         return results;

     }

     // where

         private void handleFlowResults(Queue<Env<AttrContext>> queue, ListBuffer<Element> elems) {

             for (Env<AttrContext> env: queue) {

                 switch (env.tree.getTag()) {

                     case CLASSDEF:

                         JCClassDecl cdef = (JCClassDecl) env.tree;

                         if (cdef.sym != null)

                             elems.append(cdef.sym);

                         break;

                     case TOPLEVEL:

                         JCCompilationUnit unit = (JCCompilationUnit) env.tree;

                         if (unit.packge != null)

                             elems.append(unit.packge);

                         break;

                 }

             }

             genList.addAll(queue);

         }

     /**

      * Generate code.

      * @throws IOException TODO

      */

     @Override

     public Iterable<? extends JavaFileObject> generate() throws IOException {

         return generate(null);

     }

     /**

      * Generate code corresponding to the given classes.

      * The classes must have previously been returned from {@link #enter}.

      * If there are classes outstanding to be analyzed, that will be done before

      * any classes are generated.

      * If null is specified, code will be generated for all outstanding classes.

      *

      * @param classes a list of class elements

      */

     public Iterable<? extends JavaFileObject> generate(Iterable<? extends TypeElement> classes) throws IOException {

         final ListBuffer<JavaFileObject> results = new ListBuffer<JavaFileObject>();

         try {

             analyze(null);  // ensure all classes have been parsed, entered, and analyzed

             if (classes == null) {

                 compiler.generate(compiler.desugar(genList), results);

                 genList.clear();

             }

             else {

                 Filter f = new Filter() {

                         public void process(Env<AttrContext> env) {

                             compiler.generate(compiler.desugar(ListBuffer.of(env)), results);

                         }

                     };

                 f.run(genList, classes);

             }

             if (genList.isEmpty()) {

                 compiler.reportDeferredDiagnostics();

                 cleanup();

             }

         }

         finally {

             if (compiler != null)

                 compiler.log.flush();

         }

         return results;

     }

     public TypeMirror getTypeMirror(Iterable<? extends Tree> path) {

         // TODO: Should complete attribution if necessary

         Tree last = null;

         for (Tree node : path)

             last = node;

         return ((JCTree)last).type;

     }

     public JavacElements getElements() {

         if (context == null)

             throw new IllegalStateException();

         return JavacElements.instance(context);

     }

     public JavacTypes getTypes() {

         if (context == null)

             throw new IllegalStateException();

         return JavacTypes.instance(context);

     }

     public Iterable<? extends Tree> pathFor(CompilationUnitTree unit, Tree node) {

         return TreeInfo.pathFor((JCTree) node, (JCTree.JCCompilationUnit) unit).reverse();

     }

     abstract class Filter {

         void run(Queue<Env<AttrContext>> list, Iterable<? extends TypeElement> classes) {

             Set<TypeElement> set = new HashSet<TypeElement>();

             for (TypeElement item: classes)

                 set.add(item);

             ListBuffer<Env<AttrContext>> defer = ListBuffer.<Env<AttrContext>>lb();

             while (list.peek() != null) {

                 Env<AttrContext> env = list.remove();

                 ClassSymbol csym = env.enclClass.sym;

                 if (csym != null && set.contains(csym.outermostClass()))

                     process(env);

                 else

                     defer = defer.append(env);

             }

             list.addAll(defer);

         }

         abstract void process(Env<AttrContext> env);

     }

     /**

      * For internal use only.  This method will be

      * removed without warning.

      */

     public Type parseType(String expr, TypeElement scope) {

         if (expr == null || expr.equals(""))

             throw new IllegalArgumentException();

         compiler = JavaCompiler.instance(context);

         JavaFileObject prev = compiler.log.useSource(null);

         ParserFactory parserFactory = ParserFactory.instance(context);

         Attr attr = Attr.instance(context);

         try {

             CharBuffer buf = CharBuffer.wrap((expr+"\u0000").toCharArray(), 0, expr.length());

             Parser parser = parserFactory.newParser(buf, false, false, false);

             JCTree tree = parser.parseType();

             return attr.attribType(tree, (Symbol.TypeSymbol)scope);

         } finally {

             compiler.log.useSource(prev);

         }

     }

 }