Example usage for org.objectweb.asm.tree ClassNode ClassNode

Introduction

In this page you can find the example usage for org.objectweb.asm.tree ClassNode ClassNode.

Prototype

public ClassNode() 

Source Link

Document

Constructs a new ClassNode .

Usage

From source file:org.friz.bytecode.Container.java

License:Open Source License

public Container(File file) {
    this.elements = new HashMap<>();
    this.others = new HashMap<>();

    this.refactorer = new Refactorer(this);

    try {//w  w w. ja v  a  2 s. c  om
        if (file.getPath().endsWith(".jar")) {
            this.jar = true;

            try (JarFile jar = new JarFile(file)) {
                this.main_class = jar.getManifest().getMainAttributes().getValue("Main-Class");
                Enumeration<JarEntry> enumeration = jar.entries();
                while (enumeration.hasMoreElements()) {
                    JarEntry next = enumeration.nextElement();
                    if (next.getName().endsWith(".class")) {
                        ClassReader reader = new ClassReader(jar.getInputStream(next));
                        ClassNode node = new ClassNode();
                        reader.accept(node, ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
                        ClassElement element = new ClassElement(node);

                        elements.put(element.name(), element);
                    } else if (!next.getName().contains("META-INF")) {
                        others.put(next.getName(),
                                ByteBuffer.wrap(ByteStreams.toByteArray(jar.getInputStream(next))));
                    }
                }
                jar.close();
            }
        } else if (file.getPath().endsWith(".class")) {
            this.jar = false;

            ClassReader reader = new ClassReader(new FileInputStream(file));
            ClassNode node = new ClassNode();
            reader.accept(node, ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
            ClassElement element = new ClassElement(node);

            elements.put(element.name(), element);
        }
        logger.info("Loaded " + elements.size() + " Class(es).");
    } catch (IOException e) {
        logger.error("Error loading class(es)!", e);
    }
}

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From source file:org.friz.bytecode.Container.java

License:Open Source License

public ClassElement getClass(String name) {
    if (name == null) {
        return null;
    }//w ww .jav a2s .  c om

    ClassElement c = elements.get(name);

    if (c == null) {
        ClassNode n = new ClassNode();
        ClassReader cr;
        try {
            cr = new ClassReader(name);
        } catch (IOException e) {
            return null;
        }
        cr.accept(n, 0);
        c = new ClassElement(n);
    }
    return c;
}

---

From source file:org.friz.bytecode.Container.java

License:Open Source License

public String getName(String name) {
    if (name == null) {
        return null;
    }//from   ww w. j a va 2s.  c  om

    String newName = null;
    if (refactorer().classes().containsKey(name))
        newName = refactorer().classes().get(name).getRefName();
    else {
        ClassElement el = elements.get(name);
        if (el != null)
            newName = el.name();
    }

    if (newName == null) {
        ClassNode n = new ClassNode();
        ClassReader cr;
        try {
            cr = new ClassReader(name);
        } catch (IOException e) {
            return null;
        }
        cr.accept(n, 0);
        newName = n.name;
    }
    return newName;
}

---

From source file:org.friz.bytecode.refactor.Refactorer.java

License:Open Source License

public void transform() {
    Map<String, ClassElement> refactored = new HashMap<>();
    for (ClassElement el : container().elements()) {
        String oldName = el.name();
        ClassReader cr = new ClassReader(getClassNodeBytes(el.node()));
        ClassWriter cw = new ClassWriter(cr, 0);
        RemappingClassAdapter rca = new RemappingClassAdapter(cw, mapper);
        cr.accept(rca, ClassReader.EXPAND_FRAMES);
        cr = new ClassReader(cw.toByteArray());
        ClassNode cn = new ClassNode();
        cr.accept(cn, 0);//from w  w  w  .  ja  va 2 s.  c  om
        refactored.put(oldName, new ClassElement(cn));
    }
    for (Map.Entry<String, ClassElement> factor : refactored.entrySet()) {
        container.relocate(factor.getKey(), factor.getValue());
    }
}

---

From source file:org.glassfish.pfl.tf.tools.enhancer.Transformer.java

License:Open Source License

public byte[] evaluate(final byte[] arg) {
    final ClassNode cn = new ClassNode();
    final ClassReader cr = new ClassReader(arg);
    cr.accept(cn, ClassReader.SKIP_FRAMES);

    // Ignore annotations and interfaces.
    if (util.hasAccess(cn.access, Opcodes.ACC_ANNOTATION) || util.hasAccess(cn.access, Opcodes.ACC_INTERFACE)) {
        return null;
    }//w w  w.  j a v  a 2  s .  c  om

    try {
        ecd = new EnhancedClassDataASMImpl(util, annotationNames, cn);

        // If this class is not annotated as a traced class, ignore it.
        if (!ecd.isTracedClass()) {
            return null;
        }

        processTimers();

        byte[] phase1 = null;
        if ((mode == EnhanceTool.ProcessingMode.UpdateSchemas)
                || (mode == EnhanceTool.ProcessingMode.TraceEnhance)) {
            phase1 = util.transform(false, arg, new UnaryFunction<ClassVisitor, ClassAdapter>() {
                public ClassAdapter evaluate(ClassVisitor arg) {
                    return new ClassEnhancer(util, ecd, arg);
                }
            });
        }

        // Only communication from part 1 to part2 is a byte[] and
        // the EnhancedClassData.  A runtime version can be regenerated
        // as above from the byte[] from the class file as it is presented
        // to a ClassFileTransformer.
        //     Implementation note: runtime would keep byte[] stored of
        //     original version whenever tracing is enabled, so that
        //     disabling tracing simply means using a ClassFileTransformer
        //     to get back to the original code.
        //
        // Then add tracing code (part 2).
        //     This is a pure visitor using the AdviceAdapter.
        //     It must NOT modify its input visitor (or you get an
        //     infinite series of calls to onMethodExit...)

        if (mode == EnhanceTool.ProcessingMode.TraceEnhance) {
            final byte[] phase2 = util.transform(util.getDebug(), phase1,
                    new UnaryFunction<ClassVisitor, ClassAdapter>() {

                        public ClassAdapter evaluate(ClassVisitor arg) {
                            return new ClassTracer(util, ecd, arg);
                        }
                    });

            return phase2;
        } else {
            return phase1;
        }
    } catch (TraceEnhancementException exc) {
        if (util.getDebug()) {
            util.info(1, "Could not enhance file: " + exc);
        }

        return null;
    }
}

---

From source file:org.glowroot.agent.weaving.WeavingClassVisitor.java

License:Apache License

@RequiresNonNull("type")
private void addMixin(MixinType mixinType) {
    ClassReader cr = new ClassReader(mixinType.implementationBytes());
    ClassNode cn = new ClassNode();
    cr.accept(cn, ClassReader.EXPAND_FRAMES);
    // SuppressWarnings because generics are explicitly removed from asm binaries
    // see http://forge.ow2.org/tracker/?group_id=23&atid=100023&func=detail&aid=316377
    @SuppressWarnings("unchecked")
    List<FieldNode> fieldNodes = cn.fields;
    for (FieldNode fieldNode : fieldNodes) {
        fieldNode.accept(this);
    }//from   w  w  w. j a v  a  2  s .  c om
    // SuppressWarnings because generics are explicitly removed from asm binaries
    @SuppressWarnings("unchecked")
    List<MethodNode> methodNodes = cn.methods;
    for (MethodNode mn : methodNodes) {
        if (mn.name.equals("<init>")) {
            continue;
        }
        // SuppressWarnings because generics are explicitly removed from asm binaries
        @SuppressWarnings("unchecked")
        String[] exceptions = Iterables.toArray(mn.exceptions, String.class);
        MethodVisitor mv = cw.visitMethod(mn.access, mn.name, mn.desc, mn.signature, exceptions);
        mn.accept(new RemappingMethodAdapter(mn.access, mn.desc, mv,
                new SimpleRemapper(cn.name, type.getInternalName())));
    }
}

---

From source file:org.glowroot.weaving.WeavingClassVisitor.java

License:Apache License

@RequiresNonNull("type")
private void addMixin(MixinType mixinType) {
    ClassReader cr = new ClassReader(mixinType.implementationBytes());
    ClassNode cn = new ClassNode();
    cr.accept(cn, ClassReader.EXPAND_FRAMES);
    // SuppressWarnings because generics are explicitly removed from asm binaries
    // see http://forge.ow2.org/tracker/?group_id=23&atid=100023&func=detail&aid=316377
    @SuppressWarnings("unchecked")
    List<FieldNode> fieldNodes = cn.fields;
    for (FieldNode fieldNode : fieldNodes) {
        fieldNode.accept(this);
    }/*w ww  .ja  va 2  s.  c o m*/
    // SuppressWarnings because generics are explicitly removed from asm binaries
    @SuppressWarnings("unchecked")
    List<MethodNode> methodNodes = cn.methods;
    for (MethodNode mn : methodNodes) {
        if (mn.name.equals("<init>")) {
            continue;
        }
        // SuppressWarnings because generics are explicitly removed from asm binaries
        @SuppressWarnings("unchecked")
        String[] exceptions = Iterables.toArray(mn.exceptions, String.class);
        MethodVisitor mv = cv.visitMethod(mn.access, mn.name, mn.desc, mn.signature, exceptions);
        checkNotNull(mv);
        mn.accept(new RemappingMethodAdapter(mn.access, mn.desc, mv,
                new SimpleRemapper(cn.name, type.getInternalName())));
    }
}

---

From source file:org.hua.ast.visitors.BytecodeGeneratorASTVisitor.java

@Override
public void visit(ClassDefinition node) throws ASTVisitorException {
    ClassNode classNode = new ClassNode();
    cn = classNode;/*from  w w w .  jav a2s  . c  om*/

    cn.version = Opcodes.V1_5;
    cn.superName = "java/lang/Object";
    cn.name = node.getIdentifier();
    cn.access = Opcodes.ACC_PUBLIC;

    // create constructor
    mn = new MethodNode(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    mn.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
    mn.instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false));
    mn.instructions.add(new InsnNode(Opcodes.RETURN));

    mn.maxLocals = 1;
    mn.maxStack = 1;
    classNode.methods.add(mn);

    node.getFfDefinitions().accept(this);

    // IMPORTANT: this should be dynamically calculated
    // use COMPUTE_MAXS when computing the ClassWriter,
    // e.g. new ClassWriter(ClassWriter.COMPUTE_MAXS)
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    //         ClassVisitor ca = new CheckClassAdapter(cw);
    //         cn.accept(new CheckClassAdapter(ca));
    TraceClassVisitor cv = new TraceClassVisitor(cw, new PrintWriter(System.out));

    cn.accept(cv);
    //get code
    byte code[] = cw.toByteArray();

    Logger.getLogger(BytecodeGeneratorASTVisitor.class.getName())
            .info("Writing " + node.getIdentifier() + " class to .class file");
    // update to file
    FileOutputStream fos;
    try {
        fos = new FileOutputStream(node.getIdentifier() + ".class");
        fos.write(code);
        fos.close();
    } catch (FileNotFoundException ex) {
        Logger.getLogger(BytecodeGeneratorASTVisitor.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(BytecodeGeneratorASTVisitor.class.getName()).log(Level.SEVERE, null, ex);
    }

    cn = null;
    System.out.println("##### finished writing to file");

}

---

From source file:org.jacoco.core.internal.instr.CondyProbeArrayStrategyTest.java

License:Open Source License

@Test
public void should_not_add_fields() {
    final ClassNode c = new ClassNode();
    strategy.addMembers(c, 1);

    assertEquals(0, c.fields.size());
}

---

From source file:org.jacoco.core.internal.instr.CondyProbeArrayStrategyTest.java

License:Open Source License

@Test
public void should_add_bootstrap_method() {
    final ClassNode c = new ClassNode();
    strategy.addMembers(c, 1);/*from  w  ww.  j  a va2  s . co  m*/

    assertEquals(1, c.methods.size());

    final MethodNode m = c.methods.get(0);
    assertEquals(Opcodes.ACC_SYNTHETIC | Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC, m.access);
    assertEquals("$jacocoInit", m.name);
    assertEquals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Class;)[Z", m.desc);

    assertEquals(4, m.maxStack);
    assertEquals(3, m.maxLocals);
}

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