Adds java.util.ServiceLoader support

teavm-classlib/src/main/java/org/teavm/classlib/impl/JCLPlugin.java

@@ -17,6 +17,9 @@ package org.teavm.classlib.impl;
 
 import org.teavm.javascript.JavascriptBuilderHost;
 import org.teavm.javascript.JavascriptBuilderPlugin;
+import org.teavm.model.MethodDescriptor;
+import org.teavm.model.MethodReference;
+import org.teavm.model.ValueType;
 
 /**
  *
@@ -28,5 +31,11 @@ public class JCLPlugin implements JavascriptBuilderPlugin {
         host.add(new EnumDependencySupport());
         host.add(new EnumTransformer());
         host.add(new NewInstanceDependencySupport());
+        ServiceLoaderSupport serviceLoaderSupp = new ServiceLoaderSupport(host.getClassLoader());
+        host.add(serviceLoaderSupp);
+        MethodReference loadServicesMethod = new MethodReference("java.util.ServiceLoader", new MethodDescriptor(
+                "loadServices", ValueType.object("java.lang.Class"),
+                ValueType.arrayOf(ValueType.object("java.lang.Object"))));
+        host.add(loadServicesMethod, serviceLoaderSupp);
     }
 }

teavm-classlib/src/main/java/org/teavm/classlib/impl/ServiceLoaderSupport.java

@@ -0,0 +1,144 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.impl;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.util.*;
+import org.teavm.codegen.SourceWriter;
+import org.teavm.dependency.*;
+import org.teavm.javascript.ni.Generator;
+import org.teavm.javascript.ni.GeneratorContext;
+import org.teavm.model.MethodDescriptor;
+import org.teavm.model.MethodReference;
+import org.teavm.model.ValueType;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class ServiceLoaderSupport implements Generator, DependencyListener {
+    private Map<String, List<String>> serviceMap = new HashMap<>();
+    private DependencyNode allClassesNode;
+    private ClassLoader classLoader;
+    private DependencyStack stack;
+
+    public ServiceLoaderSupport(ClassLoader classLoader) {
+        this.classLoader = classLoader;
+    }
+
+    @Override
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+        writer.append("if (!").appendClass("java.util.ServiceLoader").append(".$$services$$) {").indent()
+                .softNewLine();
+        writer.appendClass("java.util.ServiceLoader").append("$$services$$ = true;").softNewLine();
+        for (Map.Entry<String, List<String>> entry : serviceMap.entrySet()) {
+            writer.appendClass(entry.getKey()).append(".$$serviceList$$ = [");
+            List<String> implementations = entry.getValue();
+            for (int i = 0; i < implementations.size(); ++i) {
+                if (i > 0) {
+                    writer.append(", ");
+                }
+                String implName = implementations.get(i);
+                writer.append("[").appendClass(implName).append(", ").appendMethodBody(
+                        new MethodReference(implName, new MethodDescriptor("<init>", ValueType.VOID)))
+                        .append("]");
+            }
+            writer.append("];").softNewLine();
+        }
+        writer.outdent().append("}").softNewLine();
+        String param = context.getParameterName(1);
+        writer.append("var cls = " + param + ".$data;").softNewLine();
+        writer.append("if (!cls.$$serviceList$$) {").indent().softNewLine();
+        writer.append("return $rt_createArray($rt_objcls(), 0);").softNewLine();
+        writer.outdent().append("}").softNewLine();
+        writer.append("var result = $rt_createArray($rt_objcls(), cls.$$serviceList$$.length);").softNewLine();
+        writer.append("for (var i = 0; i < result.data.length; ++i) {").indent().softNewLine();
+        writer.append("var serviceDesc = cls.$$serviceList$$[i];").softNewLine();
+        writer.append("result.data[i] = new serviceDesc[0]();").softNewLine();
+        writer.append("serviceDesc[1](result.data[i]);").softNewLine();
+        writer.outdent().append("}").softNewLine();
+        writer.append("return result;").softNewLine();
+    }
+
+    @Override
+    public void started(DependencyChecker dependencyChecker) {
+        allClassesNode = dependencyChecker.createNode();
+    }
+
+    @Override
+    public void classAchieved(DependencyChecker dependencyChecker, String className) {
+        try {
+            Enumeration<URL> resources = classLoader.getResources("META-INF/services/" + className);
+            while (resources.hasMoreElements()) {
+                URL resource = resources.nextElement();
+                try (InputStream stream = resource.openStream()) {
+                    parseServiceFile(className, stream);
+                }
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void parseServiceFile(String service, InputStream input) throws IOException {
+        BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
+        while (true) {
+            String line = reader.readLine();
+            if (line == null) {
+                break;
+            }
+            line = line.trim();
+            if (line.startsWith("#") || line.isEmpty()) {
+                continue;
+            }
+            List<String> implementors = serviceMap.get(service);
+            if (implementors == null) {
+                implementors = new ArrayList<>();
+                serviceMap.put(service, implementors);
+            }
+            implementors.add(line);
+            allClassesNode.propagate(line);
+        }
+    }
+
+    @Override
+    public void methodAchieved(final DependencyChecker dependencyChecker, MethodDependency method) {
+        MethodReference ref = method.getReference();
+        if (ref.getClassName().equals("java.util.ServiceLoader") && ref.getName().equals("loadServices")) {
+            method.getResult().propagate("[java.lang.Object");
+            stack = method.getStack();
+            allClassesNode.connect(method.getResult().getArrayItem());
+            method.getResult().getArrayItem().addConsumer(new DependencyConsumer() {
+                @Override public void consume(String type) {
+                    initConstructor(dependencyChecker, type);
+                }
+            });
+        }
+    }
+
+    private void initConstructor(DependencyChecker dependencyChecker, String type) {
+        MethodReference ctor = new MethodReference(type, new MethodDescriptor("<init>", ValueType.VOID));
+        dependencyChecker.linkMethod(ctor, stack).use();
+    }
+
+    @Override
+    public void fieldAchieved(DependencyChecker dependencyChecker, FieldDependency field) {
+    }
+}

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TClass.java

@@ -23,7 +23,7 @@ import org.teavm.javascript.ni.InjectedBy;
  *
  * @author Alexey Andreev <konsoletyper@gmail.com>
  */
-public class TClass<T extends TObject> extends TObject {
+public class TClass<T> extends TObject {
     TString name;
     boolean primitive;
     boolean array;

teavm-classlib/src/main/java/org/teavm/classlib/java/util/TServiceLoader.java

@@ -0,0 +1,63 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.util;
+
+import org.teavm.classlib.java.lang.*;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public final class TServiceLoader<S> extends TObject implements TIterable<S> {
+    private Object[] services;
+
+    private TServiceLoader(Object[] services) {
+        this.services = services;
+    }
+
+    @Override
+    public TIterator<S> iterator() {
+        return new TIterator<S>() {
+            private int index;
+            @Override public boolean hasNext() {
+                return index < services.length;
+            }
+            @SuppressWarnings("unchecked") @Override public S next() {
+                if (index == services.length) {
+                    throw new TNoSuchElementException();
+                }
+                return (S)services[index++];
+            }
+            @Override public void remove() {
+                throw new TUnsupportedOperationException();
+            }
+        };
+    }
+
+    public static <S> TServiceLoader<S> load(TClass<S> service) {
+        return new TServiceLoader<>(loadServices(service));
+    }
+
+    public static <S> TServiceLoader<S> load(TClass<S> service, @SuppressWarnings("unused") TClassLoader loader) {
+        return load(service);
+    }
+
+    public static <S> TServiceLoader<S> loadInstalled(TClass<S> service) {
+        return load(service);
+    }
+
+    private static native <T> T[] loadServices(TClass<T> serviceType);
+}

teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/ServiceLoaderTest.java

@@ -0,0 +1,34 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang.util;
+
+import static org.junit.Assert.*;
+import java.util.ServiceLoader;
+import org.junit.Test;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class ServiceLoaderTest {
+    @Test
+    public void loadsService() {
+        TestService instance = ServiceLoader.load(TestService.class).iterator().next();
+        instance.foo();
+        assertEquals(TestServiceImpl.class, instance.getClass());
+        assertEquals(1, ((TestServiceImpl)instance).getCounter());
+    }
+}

teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/TestService.java

@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang.util;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public interface TestService {
+    void foo();
+}

teavm-classlib/src/test/java/org/teavm/classlib/java/lang/util/TestServiceImpl.java

@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2014 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang.util;
+
+/**
+ *
+ * @author Alexey Andreev <konsoletyper@gmail.com>
+ */
+public class TestServiceImpl implements TestService {
+    private int counter;
+
+    @Override
+    public void foo() {
+        ++counter;
+    }
+
+    public int getCounter() {
+        return counter;
+    }
+}

teavm-classlib/src/test/resources/META-INF/services/org.teavm.classlib.java.lang.util.TestService

@@ -0,0 +1 @@
+org.teavm.classlib.java.lang.util.TestServiceImpl

teavm-core/src/main/java/org/teavm/javascript/Decompiler.java

@@ -43,6 +43,7 @@ public class Decompiler {
     private RangeTree.Node currentNode;
     private RangeTree.Node parentNode;
     private FiniteExecutor executor;
+    private Map<MethodReference, Generator> generators = new HashMap<>();
 
     public Decompiler(ClassHolderSource classSource, ClassLoader classLoader, FiniteExecutor executor) {
         this.classSource = classSource;
@@ -82,6 +83,7 @@ public class Decompiler {
             executor.execute(new Runnable() {
                 @Override public void run() {
                     Decompiler copy = new Decompiler(classSource, classLoader, executor);
+                    copy.generators = generators;
                     result.set(index, copy.decompile(classSource.get(className)));
                 }
             });
@@ -90,6 +92,10 @@ public class Decompiler {
         return result;
     }
 
+    public void addGenerator(MethodReference method, Generator generator) {
+        generators.put(method, generator);
+    }
+
     private void orderClasses(String className, Set<String> visited, List<String> order) {
         if (!visited.add(className)) {
             return;
@@ -139,6 +145,8 @@ public class Decompiler {
     }
 
     public NativeMethodNode decompileNative(MethodHolder method) {
+        Generator generator = generators.get(method.getReference());
+        if (generator == null) {
             AnnotationHolder annotHolder = method.getAnnotations().get(GeneratedBy.class.getName());
             if (annotHolder == null) {
                 throw new DecompilationException("Method " + method.getOwnerName() + "." + method.getDescriptor() +
@@ -146,7 +154,6 @@ public class Decompiler {
             }
             ValueType annotValue = annotHolder.getValues().get("value").getJavaClass();
             String generatorClassName = ((ValueType.Object)annotValue).getClassName();
-        Generator generator;
             try {
                 Class<?> generatorClass = Class.forName(generatorClassName, true, classLoader);
                 generator = (Generator)generatorClass.newInstance();
@@ -154,6 +161,7 @@ public class Decompiler {
                 throw new DecompilationException("Error instantiating generator " + generatorClassName +
                         " for native method " + method.getOwnerName() + "." + method.getDescriptor());
             }
+        }
         NativeMethodNode methodNode = new NativeMethodNode(new MethodReference(method.getOwnerName(),
                 method.getDescriptor()));
         methodNode.getModifiers().addAll(mapModifiers(method.getModifiers()));

teavm-core/src/main/java/org/teavm/javascript/JavascriptBuilder.java

@@ -21,6 +21,7 @@ import org.teavm.codegen.*;
 import org.teavm.common.FiniteExecutor;
 import org.teavm.dependency.*;
 import org.teavm.javascript.ast.ClassNode;
+import org.teavm.javascript.ni.Generator;
 import org.teavm.model.*;
 import org.teavm.model.util.ListingBuilder;
 import org.teavm.model.util.ProgramUtils;
@@ -43,6 +44,7 @@ public class JavascriptBuilder implements JavascriptBuilderHost {
     private Map<String, JavascriptEntryPoint> entryPoints = new HashMap<>();
     private Map<String, String> exportedClasses = new HashMap<>();
     private List<JavascriptResourceRenderer> ressourceRenderers = new ArrayList<>();
+    private Map<MethodReference, Generator> methodGenerators = new HashMap<>();
 
     JavascriptBuilder(ClassHolderSource classSource, ClassLoader classLoader, FiniteExecutor executor) {
         this.classSource = new JavascriptProcessedClassSource(classSource);
@@ -66,6 +68,16 @@ public class JavascriptBuilder implements JavascriptBuilderHost {
         ressourceRenderers.add(resourceRenderer);
     }
 
+    @Override
+    public void add(MethodReference methodRef, Generator generator) {
+        methodGenerators.put(methodRef, generator);
+    }
+
+    @Override
+    public ClassLoader getClassLoader() {
+        return classLoader;
+    }
+
     public boolean isMinifying() {
         return minifying;
     }
@@ -160,6 +172,9 @@ public class JavascriptBuilder implements JavascriptBuilderHost {
         }
         Renderer renderer = new Renderer(sourceWriter, classSet, classLoader);
         renderer.renderRuntime();
+        for (Map.Entry<MethodReference, Generator> entry : methodGenerators.entrySet()) {
+            decompiler.addGenerator(entry.getKey(), entry.getValue());
+        }
         List<ClassNode> clsNodes = decompiler.decompile(classSet.getClassNames());
         for (ClassNode clsNode : clsNodes) {
             renderer.render(clsNode);

teavm-core/src/main/java/org/teavm/javascript/JavascriptBuilderHost.java

@@ -16,7 +16,9 @@
 package org.teavm.javascript;
 
 import org.teavm.dependency.DependencyListener;
+import org.teavm.javascript.ni.Generator;
 import org.teavm.model.ClassHolderTransformer;
+import org.teavm.model.MethodReference;
 
 /**
  *
@@ -28,4 +30,8 @@ public interface JavascriptBuilderHost {
     void add(ClassHolderTransformer classTransformer);
 
     void add(JavascriptResourceRenderer resourceRenderer);
+
+    void add(MethodReference methodRef, Generator generator);
+
+    ClassLoader getClassLoader();
 }