jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/file/Paths.java@85fecace920b (annotated)

src/share/classes/com/sun/tools/javac/file/Paths.java@85fecace920b (annotated)

src/share/classes/com/sun/tools/javac/file/Paths.java

Thu, 30 Jul 2009 10:29:53 +0100

author: mcimadamore
date: Thu, 30 Jul 2009 10:29:53 +0100
changeset 341: 85fecace920b
parent 285: 4ce1c1400334
child 450: 4011f49b4af8
permissions: -rw-r--r--

6827648: Extremely slow compilation time for visitor pattern code + generics
Summary: Javac unnecessarily recomputates type-substitutions multiple times
Reviewed-by: jjg

 /*
  * Copyright 2003-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Sun designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Sun in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 package com.sun.tools.javac.file;
 import java.io.File;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.zip.ZipFile;
 import javax.tools.JavaFileManager.Location;
 import com.sun.tools.javac.code.Lint;
 import com.sun.tools.javac.util.Context;
 import com.sun.tools.javac.util.ListBuffer;
 import com.sun.tools.javac.util.Log;
 import com.sun.tools.javac.util.Options;
 import static javax.tools.StandardLocation.*;
 import static com.sun.tools.javac.main.OptionName.*;
 /** This class converts command line arguments, environment variables
  *  and system properties (in File.pathSeparator-separated String form)
  *  into a boot class path, user class path, and source path (in
  *  Collection<String> form).
  *
  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
  *  you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class Paths {
     /** The context key for the todo list */
     protected static final Context.Key<Paths> pathsKey =
         new Context.Key<Paths>();
     /** Get the Paths instance for this context.
      *  @param context the context
      *  @return the Paths instance for this context
      */
     static Paths instance(Context context) {
         Paths instance = context.get(pathsKey);
         if (instance == null)
             instance = new Paths(context);
         return instance;
     }
     /** The log to use for warning output */
     private Log log;
     /** Collection of command-line options */
     private Options options;
     /** Handler for -Xlint options */
     private Lint lint;
     /** Access to (possibly cached) file info */
     private FSInfo fsInfo;
     protected Paths(Context context) {
         context.put(pathsKey, this);
         pathsForLocation = new HashMap<Location,Path>(16);
         setContext(context);
     }
     void setContext(Context context) {
         log = Log.instance(context);
         options = Options.instance(context);
         lint = Lint.instance(context);
         fsInfo = FSInfo.instance(context);
     }
     /** Whether to warn about non-existent path elements */
     private boolean warn;
     private Map<Location, Path> pathsForLocation;
     private boolean inited = false; // TODO? caching bad?
     /**
      * rt.jar as found on the default bootclass path.  If the user specified a
      * bootclasspath, null is used.
      */
     private File bootClassPathRtJar = null;
     Path getPathForLocation(Location location) {
         Path path = pathsForLocation.get(location);
         if (path == null)
             setPathForLocation(location, null);
         return pathsForLocation.get(location);
     }
     void setPathForLocation(Location location, Iterable<? extends File> path) {
         // TODO? if (inited) throw new IllegalStateException
         // TODO: otherwise reset sourceSearchPath, classSearchPath as needed
         Path p;
         if (path == null) {
             if (location == CLASS_PATH)
                 p = computeUserClassPath();
             else if (location == PLATFORM_CLASS_PATH)
                 p = computeBootClassPath();
             else if (location == ANNOTATION_PROCESSOR_PATH)
                 p = computeAnnotationProcessorPath();
             else if (location == SOURCE_PATH)
                 p = computeSourcePath();
             else
                 // no defaults for other paths
                 p = null;
         } else {
             p = new Path();
             for (File f: path)
                 p.addFile(f, warn); // TODO: is use of warn appropriate?
         }
         pathsForLocation.put(location, p);
     }
     protected void lazy() {
         if (!inited) {
             warn = lint.isEnabled(Lint.LintCategory.PATH);
             pathsForLocation.put(PLATFORM_CLASS_PATH, computeBootClassPath());
             pathsForLocation.put(CLASS_PATH, computeUserClassPath());
             pathsForLocation.put(SOURCE_PATH, computeSourcePath());
             inited = true;
         }
     }
     public Collection<File> bootClassPath() {
         lazy();
         return Collections.unmodifiableCollection(getPathForLocation(PLATFORM_CLASS_PATH));
     }
     public Collection<File> userClassPath() {
         lazy();
         return Collections.unmodifiableCollection(getPathForLocation(CLASS_PATH));
     }
     public Collection<File> sourcePath() {
         lazy();
         Path p = getPathForLocation(SOURCE_PATH);
         return p == null || p.size() == 0
             ? null
             : Collections.unmodifiableCollection(p);
     }
     boolean isBootClassPathRtJar(File file) {
         return file.equals(bootClassPathRtJar);
     }
     /**
      * Split a path into its elements. Empty path elements will be ignored.
      * @param path The path to be split
      * @return The elements of the path
      */
     private static Iterable<File> getPathEntries(String path) {
         return getPathEntries(path, null);
     }
     /**
      * Split a path into its elements. If emptyPathDefault is not null, all
      * empty elements in the path, including empty elements at either end of
      * the path, will be replaced with the value of emptyPathDefault.
      * @param path The path to be split
      * @param emptyPathDefault The value to substitute for empty path elements,
      *  or null, to ignore empty path elements
      * @return The elements of the path
      */
     private static Iterable<File> getPathEntries(String path, File emptyPathDefault) {
         ListBuffer<File> entries = new ListBuffer<File>();
         int start = 0;
         while (start <= path.length()) {
             int sep = path.indexOf(File.pathSeparatorChar, start);
             if (sep == -1)
                 sep = path.length();
             if (start < sep)
                 entries.add(new File(path.substring(start, sep)));
             else if (emptyPathDefault != null)
                 entries.add(emptyPathDefault);
             start = sep + 1;
         }
         return entries;
     }
     private class Path extends LinkedHashSet<File> {
         private static final long serialVersionUID = 0;
         private boolean expandJarClassPaths = false;
         private Set<File> canonicalValues = new HashSet<File>();
         public Path expandJarClassPaths(boolean x) {
             expandJarClassPaths = x;
             return this;
         }
         /** What to use when path element is the empty string */
         private File emptyPathDefault = null;
         public Path emptyPathDefault(File x) {
             emptyPathDefault = x;
             return this;
         }
         public Path() { super(); }
         public Path addDirectories(String dirs, boolean warn) {
             if (dirs != null)
                 for (File dir : getPathEntries(dirs))
                     addDirectory(dir, warn);
             return this;
         }
         public Path addDirectories(String dirs) {
             return addDirectories(dirs, warn);
         }
         private void addDirectory(File dir, boolean warn) {
             if (!dir.isDirectory()) {
                 if (warn)
                     log.warning("dir.path.element.not.found", dir);
                 return;
             }
             File[] files = dir.listFiles();
             if (files == null)
                 return;
             for (File direntry : files) {
                 if (isArchive(direntry))
                     addFile(direntry, warn);
             }
         }
         public Path addFiles(String files, boolean warn) {
             if (files != null)
                 for (File file : getPathEntries(files, emptyPathDefault))
                     addFile(file, warn);
             return this;
         }
         public Path addFiles(String files) {
             return addFiles(files, warn);
         }
         public void addFile(File file, boolean warn) {
             File canonFile = fsInfo.getCanonicalFile(file);
             if (contains(file) || canonicalValues.contains(canonFile)) {
                 /* Discard duplicates and avoid infinite recursion */
                 return;
             }
             if (! fsInfo.exists(file)) {
                 /* No such file or directory exists */
                 if (warn)
                     log.warning("path.element.not.found", file);
             } else if (fsInfo.isFile(file)) {
                 /* File is an ordinary file. */
                 if (!isArchive(file)) {
                     /* Not a recognized extension; open it to see if
                      it looks like a valid zip file. */
                     try {
                         ZipFile z = new ZipFile(file);
                         z.close();
                         if (warn)
                             log.warning("unexpected.archive.file", file);
                     } catch (IOException e) {
                         // FIXME: include e.getLocalizedMessage in warning
                         if (warn)
                             log.warning("invalid.archive.file", file);
                         return;
                     }
                 }
             }
             /* Now what we have left is either a directory or a file name
                confirming to archive naming convention */
             super.add(file);
             canonicalValues.add(canonFile);
             if (expandJarClassPaths && fsInfo.exists(file) && fsInfo.isFile(file))
                 addJarClassPath(file, warn);
         }
         // Adds referenced classpath elements from a jar's Class-Path
         // Manifest entry.  In some future release, we may want to
         // update this code to recognize URLs rather than simple
         // filenames, but if we do, we should redo all path-related code.
         private void addJarClassPath(File jarFile, boolean warn) {
             try {
                 for (File f: fsInfo.getJarClassPath(jarFile)) {
                     addFile(f, warn);
                 }
             } catch (IOException e) {
                 log.error("error.reading.file", jarFile, e.getLocalizedMessage());
             }
         }
     }
     private Path computeBootClassPath() {
         bootClassPathRtJar = null;
         String optionValue;
         Path path = new Path();
         path.addFiles(options.get(XBOOTCLASSPATH_PREPEND));
         if ((optionValue = options.get(ENDORSEDDIRS)) != null)
             path.addDirectories(optionValue);
         else
             path.addDirectories(System.getProperty("java.endorsed.dirs"), false);
         if ((optionValue = options.get(BOOTCLASSPATH)) != null) {
             path.addFiles(optionValue);
         } else {
             // Standard system classes for this compiler's release.
             String files = System.getProperty("sun.boot.class.path");
             path.addFiles(files, false);
             File rt_jar = new File("rt.jar");
             for (File file : getPathEntries(files)) {
                 if (new File(file.getName()).equals(rt_jar))
                     bootClassPathRtJar = file;
             }
         }
         path.addFiles(options.get(XBOOTCLASSPATH_APPEND));
         // Strictly speaking, standard extensions are not bootstrap
         // classes, but we treat them identically, so we'll pretend
         // that they are.
         if ((optionValue = options.get(EXTDIRS)) != null)
             path.addDirectories(optionValue);
         else
             path.addDirectories(System.getProperty("java.ext.dirs"), false);
         return path;
     }
     private Path computeUserClassPath() {
         String cp = options.get(CLASSPATH);
         // CLASSPATH environment variable when run from `javac'.
         if (cp == null) cp = System.getProperty("env.class.path");
         // If invoked via a java VM (not the javac launcher), use the
         // platform class path
         if (cp == null && System.getProperty("application.home") == null)
             cp = System.getProperty("java.class.path");
         // Default to current working directory.
         if (cp == null) cp = ".";
         return new Path()
             .expandJarClassPaths(true)        // Only search user jars for Class-Paths
             .emptyPathDefault(new File("."))  // Empty path elt ==> current directory
             .addFiles(cp);
     }
     private Path computeSourcePath() {
         String sourcePathArg = options.get(SOURCEPATH);
         if (sourcePathArg == null)
             return null;
         return new Path().addFiles(sourcePathArg);
     }
     private Path computeAnnotationProcessorPath() {
         String processorPathArg = options.get(PROCESSORPATH);
         if (processorPathArg == null)
             return null;
         return new Path().addFiles(processorPathArg);
     }
     /** The actual effective locations searched for sources */
     private Path sourceSearchPath;
     public Collection<File> sourceSearchPath() {
         if (sourceSearchPath == null) {
             lazy();
             Path sourcePath = getPathForLocation(SOURCE_PATH);
             Path userClassPath = getPathForLocation(CLASS_PATH);
             sourceSearchPath = sourcePath != null ? sourcePath : userClassPath;
         }
         return Collections.unmodifiableCollection(sourceSearchPath);
     }
     /** The actual effective locations searched for classes */
     private Path classSearchPath;
     public Collection<File> classSearchPath() {
         if (classSearchPath == null) {
             lazy();
             Path bootClassPath = getPathForLocation(PLATFORM_CLASS_PATH);
             Path userClassPath = getPathForLocation(CLASS_PATH);
             classSearchPath = new Path();
             classSearchPath.addAll(bootClassPath);
             classSearchPath.addAll(userClassPath);
         }
         return Collections.unmodifiableCollection(classSearchPath);
     }
     /** The actual effective locations for non-source, non-class files */
     private Path otherSearchPath;
     Collection<File> otherSearchPath() {
         if (otherSearchPath == null) {
             lazy();
             Path userClassPath = getPathForLocation(CLASS_PATH);
             Path sourcePath = getPathForLocation(SOURCE_PATH);
             if (sourcePath == null)
                 otherSearchPath = userClassPath;
             else {
                 otherSearchPath = new Path();
                 otherSearchPath.addAll(userClassPath);
                 otherSearchPath.addAll(sourcePath);
             }
         }
         return Collections.unmodifiableCollection(otherSearchPath);
     }
     /** Is this the name of an archive file? */
     private boolean isArchive(File file) {
         String n = file.getName().toLowerCase();
         return fsInfo.isFile(file)
             && (n.endsWith(".jar") || n.endsWith(".zip"));
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/file/Paths.java@85fecace920b (annotated)

src/share/classes/com/sun/tools/javac/file/Paths.java