aoqi@0: /*
aoqi@0:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package org.openjdk.tests.separate;
aoqi@0: 
aoqi@0: import java.util.*;
aoqi@0: import java.util.concurrent.atomic.AtomicInteger;
aoqi@0: import java.util.concurrent.ConcurrentHashMap;
aoqi@0: import java.io.*;
aoqi@0: import java.net.URI;
aoqi@0: import javax.tools.*;
aoqi@0: 
aoqi@0: import com.sun.source.util.JavacTask;
aoqi@0: 
aoqi@0: import static org.openjdk.tests.separate.SourceModel.Type;
aoqi@0: import static org.openjdk.tests.separate.SourceModel.Class;
aoqi@0: import static org.openjdk.tests.separate.SourceModel.Extends;
aoqi@0: import static org.openjdk.tests.separate.SourceModel.SourceProcessor;
aoqi@0: 
aoqi@0: public class Compiler {
aoqi@0: 
aoqi@0:     public enum Flags {
aoqi@0:         VERBOSE, // Prints out files as they are compiled
aoqi@0:         USECACHE // Keeps results around for reuse.  Only use this is
aoqi@0:                  // you're sure that each compilation name maps to the
aoqi@0:                  // same source code
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static final AtomicInteger counter = new AtomicInteger();
aoqi@0:     private static final String targetDir = "gen-separate";
aoqi@0:     private static final File root = new File(targetDir);
aoqi@0:     private static ConcurrentHashMap<String,File> cache =
aoqi@0:             new ConcurrentHashMap<>();
aoqi@0: 
aoqi@0:     Set<Flags> flags;
aoqi@0: 
aoqi@0:     private JavaCompiler systemJavaCompiler;
aoqi@0:     private StandardJavaFileManager fm;
aoqi@0:     private List<File> tempDirs;
aoqi@0:     private List<ClassFilePreprocessor> postprocessors;
aoqi@0: 
aoqi@0:     private static class SourceFile extends SimpleJavaFileObject {
aoqi@0:         private final String content;
aoqi@0: 
aoqi@0:         public SourceFile(String name, String content) {
aoqi@0:             super(URI.create("myfo:/" + name + ".java"), Kind.SOURCE);
aoqi@0:             this.content = content;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public CharSequence getCharContent(boolean ignoreEncodingErrors) {
aoqi@0:             return toString();
aoqi@0:         }
aoqi@0: 
aoqi@0:         public String toString() { return this.content; }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Compiler(Flags ... flags) {
aoqi@0:         setFlags(flags);
aoqi@0:         this.tempDirs = new ArrayList<>();
aoqi@0:         this.postprocessors = new ArrayList<>();
aoqi@0:         this.systemJavaCompiler = ToolProvider.getSystemJavaCompiler();
aoqi@0:         this.fm = systemJavaCompiler.getStandardFileManager(null, null, null);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void setFlags(Flags ... flags) {
aoqi@0:         this.flags = new HashSet<>(Arrays.asList(flags));
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void addPostprocessor(ClassFilePreprocessor cfp) {
aoqi@0:         this.postprocessors.add(cfp);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Compile hierarchies starting with each of the 'types' and return
aoqi@0:      * a ClassLoader that can be used to load the compiled classes.
aoqi@0:      */
aoqi@0:     public ClassLoader compile(Type ... types) {
aoqi@0:         ClassFilePreprocessor[] cfps = this.postprocessors.toArray(
aoqi@0:             new ClassFilePreprocessor[0]);
aoqi@0: 
aoqi@0:         DirectedClassLoader dcl = new DirectedClassLoader(cfps);
aoqi@0: 
aoqi@0:         for (Type t : types) {
aoqi@0:             for (Map.Entry<String,File> each : compileHierarchy(t).entrySet()) {
aoqi@0:                 dcl.setLocationFor(each.getKey(), each.getValue());
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return dcl;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Compiles and loads a hierarchy, starting at 'type'
aoqi@0:      */
aoqi@0:     public java.lang.Class<?> compileAndLoad(Type type)
aoqi@0:             throws ClassNotFoundException {
aoqi@0: 
aoqi@0:         ClassLoader loader = compile(type);
aoqi@0:         return java.lang.Class.forName(type.getName(), false, loader);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Compiles a hierarchy, starting at 'type' and return a mapping of the
aoqi@0:      * name to the location where the classfile for that type resides.
aoqi@0:      */
aoqi@0:     private Map<String,File> compileHierarchy(Type type) {
aoqi@0:         HashMap<String,File> outputDirs = new HashMap<>();
aoqi@0: 
aoqi@0:         File outDir = compileOne(type);
aoqi@0:         outputDirs.put(type.getName(), outDir);
aoqi@0: 
aoqi@0:         Class superClass = type.getSuperclass();
aoqi@0:         if (superClass != null)
aoqi@0:             outputDirs.putAll(compileHierarchy(superClass));
aoqi@0:         for (Extends ext : type.getSupertypes())
aoqi@0:             outputDirs.putAll(compileHierarchy(ext.getType()));
aoqi@0: 
aoqi@0:         return outputDirs;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private File compileOne(Type type) {
aoqi@0:         if (this.flags.contains(Flags.USECACHE)) {
aoqi@0:             File dir = cache.get(type.getName());
aoqi@0:             if (dir != null) {
aoqi@0:                 return dir;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         List<JavaFileObject> files = new ArrayList<>();
aoqi@0:         SourceProcessor accum =
aoqi@0:             (name, src) -> { files.add(new SourceFile(name, src)); };
aoqi@0: 
aoqi@0:         Collection<Type> deps = type.typeDependencies(type.isFullCompilation());
aoqi@0:         for (Type dep : deps) {
aoqi@0:             if (type.isFullCompilation())
aoqi@0:                 dep.generate(accum);
aoqi@0:             else
aoqi@0:                 dep.generateAsDependency(accum, type.methodDependencies());
aoqi@0:         }
aoqi@0: 
aoqi@0:         type.generate(accum);
aoqi@0: 
aoqi@0:         JavacTask ct = (JavacTask)this.systemJavaCompiler.getTask(
aoqi@0:             null, this.fm, null, null, null, files);
aoqi@0:         File destDir = null;
aoqi@0:         do {
aoqi@0:             int value = counter.incrementAndGet();
aoqi@0:             destDir = new File(root, Integer.toString(value));
aoqi@0:         } while (destDir.exists());
aoqi@0: 
aoqi@0:         if (this.flags.contains(Flags.VERBOSE)) {
aoqi@0:             System.out.println("Compilation unit for " + type.getName() +
aoqi@0:                 " : compiled into " + destDir);
aoqi@0:             for (JavaFileObject jfo : files) {
aoqi@0:                 System.out.println(jfo.toString());
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         try {
aoqi@0:             destDir.mkdirs();
aoqi@0:             this.fm.setLocation(
aoqi@0:                 StandardLocation.CLASS_OUTPUT, Arrays.asList(destDir));
aoqi@0:         } catch (IOException e) {
aoqi@0:             throw new RuntimeException(
aoqi@0:                 "IOException encountered during compilation", e);
aoqi@0:         }
aoqi@0:         Boolean result = ct.call();
aoqi@0:         if (result == Boolean.FALSE) {
aoqi@0:             throw new RuntimeException(
aoqi@0:                 "Compilation failure in " + type.getName() + " unit");
aoqi@0:         }
aoqi@0:         if (this.flags.contains(Flags.USECACHE)) {
aoqi@0:             File existing = cache.putIfAbsent(type.getName(), destDir);
aoqi@0:             if (existing != null) {
aoqi@0:                 deleteDir(destDir);
aoqi@0:                 return existing;
aoqi@0:             }
aoqi@0:         } else {
aoqi@0:         this.tempDirs.add(destDir);
aoqi@0:         }
aoqi@0:         return destDir;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void deleteDir(File dir) {
aoqi@0:         for (File f : dir.listFiles()) {
aoqi@0:             f.delete();
aoqi@0:         };
aoqi@0:         dir.delete();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void cleanup() {
aoqi@0:         if (!this.flags.contains(Flags.USECACHE)) {
aoqi@0:             for (File d : tempDirs) {
aoqi@0:                 deleteDir(d);
aoqi@0:             };
aoqi@0:             tempDirs = new ArrayList<>();
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Removes all of the elements in the cache and deletes the associated
aoqi@0:     // output directories.  This may not actually empty the cache if there
aoqi@0:     // are concurrent users of it.
aoqi@0:     public static void purgeCache() {
aoqi@0:         for (Map.Entry<String,File> entry : cache.entrySet()) {
aoqi@0:             cache.remove(entry.getKey());
aoqi@0:             deleteDir(entry.getValue());
aoqi@0:         }
aoqi@0:     }
aoqi@0: }