Example usage for org.objectweb.asm ClassVisitor visit

Introduction

In this page you can find the example usage for org.objectweb.asm ClassVisitor visit.

Prototype

public void visit(final int version, final int access, final String name, final String signature,
        final String superName, final String[] interfaces) 

Source Link

Document

Visits the header of the class.

Usage

From source file:Java6to2.java

License:Open Source License

private static byte[] transform(InputStream classfile) throws IOException {
    ClassReader cr = new ClassReader(classfile);
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    ClassVisitor cv = new ClassVisitor(ASM7, cw) {
        String internalName;//from   w w w  .jav  a  2  s. co m
        boolean classLookupMethodGenerated;
        Set fieldsGenerated = new HashSet();

        public void visit(int version, int access, String name, String signature, String superName,
                String[] interfaces) {
            /* Change class file version to 1.2 */
            cv.visit(V1_2, access, name, signature, superName, interfaces);
            this.internalName = name;
        }

        /**
         * Generates the synthetic "class$" method, used to lookup classes via Class.forName(). This uses the exact same code as does JDK8 javac for target 1.2.
         */
        void generateSyntheticClassLookupMethod() {
            MethodVisitor mv = cv.visitMethod(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC, "class$",
                    "(Ljava/lang/String;)Ljava/lang/Class;", null, null);
            {
                Label start = new Label();
                Label end = new Label();
                Label handler = new Label();
                mv.visitTryCatchBlock(start, end, handler, "java/lang/ClassNotFoundException");
                mv.visitLabel(start);
                mv.visitVarInsn(ALOAD, 0);
                mv.visitMethodInsn(INVOKESTATIC, "java/lang/Class", "forName",
                        "(Ljava/lang/String;)Ljava/lang/Class;", false);
                mv.visitLabel(end);
                mv.visitInsn(ARETURN);
                mv.visitLabel(handler);
                mv.visitVarInsn(ASTORE, 1);
                mv.visitTypeInsn(NEW, "java/lang/NoClassDefFoundError");
                mv.visitInsn(DUP);
                mv.visitMethodInsn(INVOKESPECIAL, "java/lang/NoClassDefFoundError", "<init>", "()V", false);
                mv.visitVarInsn(ALOAD, 1);
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/NoClassDefFoundError", "initCause",
                        "(Ljava/lang/Throwable;)Ljava/lang/Throwable;", false);
                mv.visitInsn(ATHROW);
            }
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }

        public MethodVisitor visitMethod(int access, String name, String desc, String signature,
                String[] exceptions) {
            MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
            final ClassVisitor cv = this.cv;
            return new MethodVisitor(ASM7, mv) {
                /**
                 * Intercepts class instantiations to see whether they instantiate a StringBuilder. Those instructions were generated by javac for string concatenations. But
                 * StringBuilder is not available on JRE1.2, so we just replace it with StringBuffer.
                 */
                public void visitTypeInsn(int opcode, String type) {
                    if (opcode == NEW && "java/lang/StringBuilder".equals(type)) {
                        mv.visitTypeInsn(opcode, "java/lang/StringBuffer");
                    } else {
                        mv.visitTypeInsn(opcode, type);
                    }
                }

                /**
                 * Intercepts method invocations to see whether they do something with StringBuilder. Those instructions were generated by javac for string concatenations. But
                 * StringBuilder is not available on JRE1.2, so we just replace it with StringBuffer.
                 */
                public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
                    if ("java/lang/StringBuilder".equals(owner)) {
                        mv.visitMethodInsn(opcode, "java/lang/StringBuffer", name,
                                desc.replace("java/lang/StringBuilder", "java/lang/StringBuffer"), itf);
                    } else {
                        mv.visitMethodInsn(opcode, owner, name, desc, itf);
                    }
                }

                /**
                 * Intercepts LDC instructions and check whether they are used to load a class. This is not supported on Java 1.2, so we convert it to the same code used by the
                 * JDK8 javac:
                 * <ul>
                 * <li>create synthetic fields holding the resolved class objects
                 * <li>create a synthetic method called "class$" which does Class.forName
                 * </ul>
                 */
                public void visitLdcInsn(Object cst) {
                    if (cst instanceof Type) {
                        Type t = (Type) cst;
                        String syntheticField = "class$"
                                + t.getInternalName().replace('/', '$').replace("[", "");
                        if (!classLookupMethodGenerated) {
                            /* Emit the synthetic "class$" method, used to lookup classes via Class.forName() */
                            generateSyntheticClassLookupMethod();
                            classLookupMethodGenerated = true;
                        }
                        if (!fieldsGenerated.contains(syntheticField)) {
                            /* Generate a synthetic field holding the resolved Class object */
                            cv.visitField(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC, syntheticField,
                                    "Ljava/lang/Class;", null, null);
                            fieldsGenerated.add(syntheticField);
                        }
                        mv.visitFieldInsn(GETSTATIC, internalName, syntheticField, "Ljava/lang/Class;");
                        Label nonNull = new Label();
                        mv.visitJumpInsn(IFNONNULL, nonNull);
                        mv.visitLdcInsn(t.getInternalName().replace('/', '.'));
                        mv.visitMethodInsn(INVOKESTATIC, internalName, "class$",
                                "(Ljava/lang/String;)Ljava/lang/Class;", false);
                        mv.visitInsn(DUP);
                        mv.visitFieldInsn(PUTSTATIC, internalName, syntheticField, "Ljava/lang/Class;");
                        Label cnt = new Label();
                        mv.visitJumpInsn(GOTO, cnt);
                        mv.visitLabel(nonNull);
                        mv.visitFieldInsn(GETSTATIC, internalName, syntheticField, "Ljava/lang/Class;");
                        mv.visitLabel(cnt);
                    } else {
                        mv.visitLdcInsn(cst);
                    }
                }
            };
        }
    };
    cr.accept(cv, ClassReader.SKIP_FRAMES); // <- Frames are not used in Java 1.2, so skip them
    return cw.toByteArray();
}

---

From source file:com.cinnober.msgcodec.blink.BaseByteCodeGenerator.java

License:Open Source License

private void generateCodec(ClassVisitor cv, Schema schema, int suffix, boolean javaClassCodec) {
    final String genClassInternalName = GENERATED_CLASS_INAME + suffix;
    cv.visit(V1_7, ACC_PUBLIC + ACC_FINAL, genClassInternalName, null, baseclassIName, null);

    generateConstructorAndFields(schema, cv, genClassInternalName, javaClassCodec);

    generateReadStaticGroup(schema, cv, genClassInternalName, javaClassCodec);
    generateReadStaticGroupForTypeAndCreate(schema, cv, genClassInternalName, javaClassCodec);
    generateReadStaticGroupForType(schema, cv, genClassInternalName, javaClassCodec);

    generateWriteStaticGroup(schema, cv, genClassInternalName, javaClassCodec);
    generateWriteStaticGroupForTypeWithId(schema, cv, genClassInternalName, javaClassCodec);
    generateWriteStaticGroupForType(schema, cv, genClassInternalName, javaClassCodec);

    cv.visitEnd();//ww w.j a v a  2s  .c o m
}

---

From source file:com.facebook.buck.jvm.java.abi.AbiFilteringClassVisitorTest.java

License:Apache License

private static void visitClass(ClassVisitor cv, String name) {
    cv.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC, name, null, "java/lang/Object", null);
}

---

From source file:com.facebook.presto.byteCode.ClassDefinition.java

License:Apache License

public void visit(ClassVisitor visitor) {
    // Generic signature if super class or any interface is generic
    String signature = null;//from   w  w  w  .j  a v  a2s.c o  m
    if (superClass.isGeneric() || any(interfaces, ParameterizedType.isGenericType())) {
        signature = genericClassSignature(superClass, interfaces);
    }

    String[] interfaces = new String[this.interfaces.size()];
    for (int i = 0; i < interfaces.length; i++) {
        interfaces[i] = this.interfaces.get(i).getClassName();
    }
    visitor.visit(V1_7, toAccessModifier(access) | ACC_SUPER, type.getClassName(), signature,
            superClass.getClassName(), interfaces);

    // visit source
    if (source != null) {
        visitor.visitSource(source, debug);
    }

    // visit annotations
    for (AnnotationDefinition annotation : annotations) {
        annotation.visitClassAnnotation(visitor);
    }

    // visit fields
    for (FieldDefinition field : fields) {
        field.visit(visitor);
    }

    // visit clinit method
    classInitializer.visit(visitor, true);

    // visit methods
    for (MethodDefinition method : methods) {
        method.visit(visitor);
    }

    // done
    visitor.visitEnd();
}

---

From source file:com.github.antag99.retinazer.weaver.MapperGenerator.java

License:Open Source License

@Override
public void accept(ClassVisitor visitor) {
    visitor.visit(V1_7, ACC_PUBLIC + ACC_FINAL + ACC_SYNTHETIC, metadata.getMapperName(),
            "Lcom/github/antag99/retinazer/PackedMapper<L" + metadata.getMapperName() + ";>;",
            "com/github/antag99/retinazer/PackedMapper", null);
    for (ComponentProperty property : metadata.properties) {
        FieldVisitor propertyField = visitor.visitField(ACC_PRIVATE + ACC_FINAL, property.getMetadataName(),
                property.getMetadataDesc(), null, null);
        if (propertyField != null)
            propertyField.visitEnd();/*from www . j  av a 2 s .c om*/
    }

    FieldVisitor flyweightField = visitor.visitField(ACC_PRIVATE + ACC_FINAL, "flyweight",
            "L" + metadata.internalName + ";", null, null);
    if (flyweightField != null)
        flyweightField.visitEnd();

    // @off: Formatter mangles the elegant method syntax

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC, "<init>",
            "(Lcom/github/antag99/retinazer/Engine;I)V", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitVarInsn(ALOAD, 1);
            visitLdcInsn(Type.getObjectType(metadata.internalName));
            visitVarInsn(ILOAD, 2);
            visitMethodInsn(Opcodes.INVOKESPECIAL, "com/github/antag99/retinazer/PackedMapper", "<init>",
                    "(Lcom/github/antag99/retinazer/Engine;Ljava/lang/Class;I)V", false);

            for (ComponentProperty property : metadata.properties) {
                visitVarInsn(ALOAD, 0);
                visitTypeInsn(NEW, WeaverConstants.getMetadataName(property.type));
                visitInsn(Opcodes.DUP);
                visitLdcInsn(property.name);
                if (property.type.getSort() == Type.OBJECT) {
                    visitLdcInsn(property.type);
                    visitMethodInsn(INVOKESPECIAL, WeaverConstants.getMetadataName(property.type), "<init>",
                            "(Ljava/lang/String;Ljava/lang/Class;)V", false);
                } else {
                    visitMethodInsn(INVOKESPECIAL, WeaverConstants.getMetadataName(property.type), "<init>",
                            "(Ljava/lang/String;)V", false);
                }
                visitFieldInsn(PUTFIELD, metadata.getMapperName(), property.getMetadataName(),
                        property.getMetadataDesc());
            }

            visitVarInsn(ALOAD, 0);
            visitInsn(DUP);
            visitMethodInsn(INVOKEVIRTUAL, metadata.getMapperName(), "createFlyweight",
                    "()L" + metadata.internalName + ";", false);
            visitFieldInsn(PUTFIELD, metadata.getMapperName(), "flyweight", "L" + metadata.internalName + ";");
            visitInsn(RETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC, "createFlyweight",
            "()L" + metadata.internalName + ";", null, null)) {
        {
            visitCode();
            visitTypeInsn(NEW, metadata.internalName);
            visitInsn(DUP);
            visitMethodInsn(INVOKESPECIAL, metadata.internalName, "<init>", "()V", false);

            for (ComponentProperty property : metadata.properties) {
                visitInsn(DUP);
                visitVarInsn(ALOAD, 0);
                visitFieldInsn(GETFIELD, metadata.getMapperName(), property.getMetadataName(),
                        property.getMetadataDesc());
                visitMethodInsn(INVOKEVIRTUAL, WeaverConstants.getMetadataName(property.type), "getBag",
                        "()" + property.getBagDesc(), false);
                visitFieldInsn(PUTFIELD, metadata.internalName, property.getBagName(), property.getBagDesc());
            }

            visitInsn(ARETURN);

            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5,
            visitor.visitMethod(ACC_PUBLIC, "create", "(I)L" + metadata.internalName + ";", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitVarInsn(ILOAD, 1);
            visitMethodInsn(INVOKEVIRTUAL, "com/github/antag99/retinazer/Mapper", "checkCreate", "(I)V", false);
            visitVarInsn(ALOAD, 0);
            visitVarInsn(ILOAD, 1);
            visitMethodInsn(INVOKEVIRTUAL, metadata.getMapperName(), "get",
                    "(I)L" + metadata.internalName + ";", false);
            visitInsn(DUP);
            visitMethodInsn(INVOKEVIRTUAL, metadata.internalName, WeaverConstants.RESET_METHOD_NAME,
                    WeaverConstants.RESET_METHOD_DESC, false);
            visitInsn(ARETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC + ACC_SYNTHETIC + ACC_BRIDGE, "create",
            "(I)Lcom/github/antag99/retinazer/Component;", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitVarInsn(ILOAD, 1);
            visitMethodInsn(INVOKEVIRTUAL, metadata.getMapperName(), "create",
                    "(I)L" + metadata.internalName + ";", false);
            visitInsn(ARETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5,
            visitor.visitMethod(ACC_PUBLIC, "get", "(I)L" + metadata.internalName + ";", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitFieldInsn(GETFIELD, metadata.getMapperName(), "flyweight", "L" + metadata.internalName + ";");
            visitInsn(DUP);
            visitVarInsn(ILOAD, 1);
            visitFieldInsn(PUTFIELD, metadata.internalName, WeaverConstants.INDEX_FIELD_NAME,
                    WeaverConstants.INDEX_FIELD_DESC);
            visitInsn(ARETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, "get",
            "(I)Lcom/github/antag99/retinazer/Component;", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitVarInsn(ILOAD, 1);
            visitMethodInsn(INVOKEVIRTUAL, metadata.getMapperName(), "get",
                    "(I)L" + metadata.internalName + ";", false);
            visitInsn(ARETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC, "getProperties",
            "()[Lcom/github/antag99/retinazer/util/Property;", null, null)) {
        {
            visitCode();
            visitLdcInsn(metadata.properties.size());
            visitTypeInsn(ANEWARRAY, "com/github/antag99/retinazer/util/Property");

            List<ComponentProperty> properties = metadata.properties;
            for (int i = 0, n = properties.size(); i < n; i++) {
                ComponentProperty property = properties.get(i);
                visitInsn(DUP);
                visitLdcInsn(i);
                visitVarInsn(ALOAD, 0);
                visitFieldInsn(GETFIELD, metadata.getMapperName(), property.getMetadataName(),
                        property.getMetadataDesc());
                visitInsn(AASTORE);
            }

            visitInsn(ARETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    new MethodVisitor(ASM5, visitor.visitMethod(ACC_PUBLIC, "applyComponentChanges", "()V", null, null)) {
        {
            visitCode();
            visitVarInsn(ALOAD, 0);
            visitFieldInsn(GETFIELD, "com/github/antag99/retinazer/Mapper", "componentsMask",
                    "Lcom/github/antag99/retinazer/util/Mask;");
            visitVarInsn(ASTORE, 1);
            visitVarInsn(ALOAD, 0);
            visitFieldInsn(GETFIELD, "com/github/antag99/retinazer/Mapper", "removeMask",
                    "Lcom/github/antag99/retinazer/util/Mask;");
            visitVarInsn(ASTORE, 2);
            for (ComponentProperty property : metadata.properties) {
                visitVarInsn(ALOAD, 0);
                visitFieldInsn(GETFIELD, metadata.getMapperName(), property.getMetadataName(),
                        property.getMetadataDesc());
                visitMethodInsn(INVOKEVIRTUAL, WeaverConstants.getMetadataName(property.type), "getBag",
                        "()" + property.getBagDesc(), false);
                visitVarInsn(ALOAD, 2);
                visitMethodInsn(INVOKEVIRTUAL, WeaverConstants.getBagName(property.type), "clear",
                        "(Lcom/github/antag99/retinazer/util/Mask;)V", false);
            }
            visitVarInsn(ALOAD, 1);
            visitVarInsn(ALOAD, 2);
            visitMethodInsn(INVOKEVIRTUAL, "com/github/antag99/retinazer/util/Mask", "andNot",
                    "(Lcom/github/antag99/retinazer/util/Mask;)V", false);
            visitInsn(RETURN);
            visitMaxs(0, 0);
            visitEnd();
        }
    };

    visitor.visitEnd();
}

---

From source file:com.gmail.socraticphoenix.nebula.event.wrappers.BytecodeEventListenerGeneration.java

License:Open Source License

public static String listener(EventListener eventListener, Class eventClass, Object listener, Method method,
        ClassVisitor visitor) {
    Type listenerType = Type.getType(listener.getClass());
    Type eventType = Type.getType(eventClass);
    String internalImplName = listenerType.getInternalName() + "$listener$" + method.getName() + "$"
            + BytecodeEventListenerGeneration.index++;

    visitor.visit(V1_8, ACC_PUBLIC | ACC_SYNTHETIC | ACC_FINAL, internalImplName, null,
            BytecodeEventListenerGeneration.objectType.getInternalName(),
            new String[] { BytecodeEventListenerGeneration.eventWrapperType.getInternalName() });
    visitor.visitField(ACC_PRIVATE | ACC_FINAL, "listener", listenerType.getDescriptor(), null, null)
            .visitEnd();/* w ww  . j a va  2  s. c  o m*/

    MethodVisitor constructor = visitor.visitMethod(ACC_PUBLIC, "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, listenerType), null, null);
    constructor.visitParameter("listener", ACC_FINAL);
    constructor.visitCode();
    constructor.visitVarInsn(ALOAD, 0);
    constructor.visitMethodInsn(INVOKESPECIAL, BytecodeEventListenerGeneration.objectType.getInternalName(),
            "<init>", Type.getMethodDescriptor(Type.VOID_TYPE), false);
    constructor.visitVarInsn(ALOAD, 0);
    constructor.visitVarInsn(ALOAD, 1);
    constructor.visitFieldInsn(PUTFIELD, internalImplName, "listener", listenerType.getDescriptor());
    constructor.visitInsn(RETURN);
    constructor.visitMaxs(0, 0);
    constructor.visitEnd();

    MethodVisitor priority = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "priority",
            BytecodeEventListenerGeneration.priorityMethod.getDescriptor(), null, null);
    priority.visitCode();
    priority.visitLdcInsn(eventListener.value());
    priority.visitInsn(IRETURN);
    priority.visitMaxs(0, 0);
    priority.visitEnd();

    MethodVisitor getListener = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "listener",
            BytecodeEventListenerGeneration.listenerMethod.getDescriptor(), null, null);
    getListener.visitVarInsn(ALOAD, 0);
    getListener.visitFieldInsn(GETFIELD, internalImplName, "listener", listenerType.getDescriptor());
    getListener.visitInsn(ARETURN);
    getListener.visitMaxs(0, 0);
    getListener.visitEnd();

    MethodVisitor event = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "mainEvent",
            BytecodeEventListenerGeneration.mainEventMethod.getDescriptor(), null, null);
    event.visitCode();
    event.visitLdcInsn(eventType);
    event.visitInsn(ARETURN);
    event.visitMaxs(0, 0);
    event.visitEnd();

    return internalImplName;
}

---

From source file:com.gmail.socraticphoenix.occurence.wrappers.BytecodeEventListenerGeneration.java

License:Open Source License

public static String listener(EventListener eventListener, Class eventClass, Object listener, Method method,
        ClassVisitor visitor) {
    Type listenerType = Type.getType(listener.getClass());
    Type eventType = Type.getType(eventClass);
    String internalImplName = listenerType.getInternalName() + "$listener$" + method.getName() + "$"
            + BytecodeEventListenerGeneration.index++;
    String simpleName = listener.getClass().getName() + "#" + method.getName() + "("
            + Stream.of(method.getParameters()).map(p -> p.getType().getSimpleName())
                    .reduce((a, b) -> a + ", " + b).orElse("")
            + ")";

    visitor.visit(V1_8, ACC_PUBLIC | ACC_SYNTHETIC | ACC_FINAL, internalImplName, null,
            BytecodeEventListenerGeneration.objectType.getInternalName(),
            new String[] { BytecodeEventListenerGeneration.eventWrapperType.getInternalName() });
    visitor.visitField(ACC_PRIVATE | ACC_FINAL, "listener", listenerType.getDescriptor(), null, null)
            .visitEnd();/*from   ww  w  . j ava2 s  .co m*/

    MethodVisitor constructor = visitor.visitMethod(ACC_PUBLIC, "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(Object.class)), null, null);
    constructor.visitParameter("listener", ACC_FINAL);
    constructor.visitCode();
    constructor.visitVarInsn(ALOAD, 0);
    constructor.visitMethodInsn(INVOKESPECIAL, BytecodeEventListenerGeneration.objectType.getInternalName(),
            "<init>", Type.getMethodDescriptor(Type.VOID_TYPE), false);
    constructor.visitVarInsn(ALOAD, 0);
    constructor.visitVarInsn(ALOAD, 1);
    constructor.visitTypeInsn(CHECKCAST, listenerType.getInternalName());
    constructor.visitFieldInsn(PUTFIELD, internalImplName, "listener", listenerType.getDescriptor());
    constructor.visitInsn(RETURN);
    constructor.visitMaxs(0, 0);
    constructor.visitEnd();

    MethodVisitor name = visitor.visitMethod(ACC_PUBLIC, "name",
            Type.getMethodDescriptor(Type.getType(String.class)), null, null);
    name.visitLdcInsn(simpleName);
    name.visitInsn(ARETURN);
    name.visitMaxs(0, 0);
    name.visitEnd();

    MethodVisitor priority = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "priority",
            BytecodeEventListenerGeneration.priorityMethod.getDescriptor(), null, null);
    priority.visitCode();
    priority.visitLdcInsn(eventListener.value());
    priority.visitInsn(IRETURN);
    priority.visitMaxs(0, 0);
    priority.visitEnd();

    MethodVisitor getListener = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "listener",
            BytecodeEventListenerGeneration.listenerMethod.getDescriptor(), null, null);
    getListener.visitVarInsn(ALOAD, 0);
    getListener.visitFieldInsn(GETFIELD, internalImplName, "listener", listenerType.getDescriptor());
    getListener.visitInsn(ARETURN);
    getListener.visitMaxs(0, 0);
    getListener.visitEnd();

    MethodVisitor event = visitor.visitMethod(ACC_PUBLIC | ACC_FINAL, "mainEvent",
            BytecodeEventListenerGeneration.mainEventMethod.getDescriptor(), null, null);
    event.visitCode();
    event.visitLdcInsn(eventType);
    event.visitInsn(ARETURN);
    event.visitMaxs(0, 0);
    event.visitEnd();

    return internalImplName;
}

---

From source file:com.google.code.jconts.instrument.gen.ComputationClassGenerator.java

License:Apache License

public void accept(TransformationContext context) {
    ClassVisitor cv = context.writer();

    // extends Object implements Computation<ValueType>
    SignatureWriter sign = new SignatureWriter();
    SignatureVisitor supsign = sign.visitSuperclass();
    supsign.visitClassType(OBJECT_NAME);
    supsign.visitEnd();//from w ww.jav a2 s. com
    SignatureVisitor iface = sign.visitInterface();
    iface.visitClassType(COMPUTATION_NAME);
    SignatureVisitor argsign = iface.visitTypeArgument('=');
    new SignatureReader(info.valueSignature).acceptType(argsign);
    argsign.visitEnd();

    cv.visit(Opcodes.V1_6, Opcodes.ACC_FINAL, info.computationClassName, sign.toString(), OBJECT_NAME,
            new String[] { COMPUTATION_NAME });

    cv.visitSource(info.ownerSource, null);
    cv.visitInnerClass(info.stateClassName, info.owner, info.stateSimpleName, 0);
    cv.visitInnerClass(info.computationClassName, info.owner, info.computationSimpleName, 0);

    cv.visitField(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, "state", stateDesc, null, null);

    generateConstructor(cv);
    generateExecute(cv);

    cv.visitEnd();
}

---

From source file:com.google.code.jconts.instrument.gen.ContinuationClassGenerator.java

License:Apache License

public void accept(TransformationContext context) {
    ClassVisitor cv = context.writer();

    cv.visit(Opcodes.V1_6, Opcodes.ACC_FINAL, info.continuationClassName, signature, OBJECT_NAME,
            new String[] { CONTINUATION_NAME });

    cv.visitSource(info.ownerSource, null);
    cv.visitInnerClass(info.stateClassName, info.owner, info.stateSimpleName, 0);
    cv.visitInnerClass(info.continuationClassName, info.owner, info.continuationSimpleName, 0);

    cv.visitField(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, "state", stateDesc, null, null);

    cv.visitField(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, "index", "I", null, null);

    generateConstructor(cv);//from  w  w  w. j a  v a 2s  .co  m
    generateExecute(cv, true);
    generateExecute(cv, false);

    cv.visitEnd();
}

---

From source file:com.google.code.jconts.instrument.gen.StateClassGenerator.java

License:Apache License

public void accept(TransformationContext context) {
    ClassVisitor cv = context.writer();

    final String name = info.stateClassName;

    cv.visit(Opcodes.V1_6, Opcodes.ACC_FINAL /*| Opcodes.ACC_SYNTHETIC*/, name, null, OBJECT_NAME, null);

    cv.visitSource(info.ownerSource, null);
    cv.visitOuterClass(info.owner, null, null);

    cv.visitField(0/*Opcodes.ACC_SYNTHETIC*/, CONTINUATION_FIELD, CONTINUATION_DESC,
            'L' + CONTINUATION_NAME + '<' + info.valueSignature + ">;", null);

    // Local variables state
    List<String> names = info.tracker.getFieldNames();
    List<Type> types = info.tracker.getFieldTypes();
    for (int i = 0; i < names.size(); ++i) {
        cv.visitField(0/*Opcodes.ACC_SYNTHETIC*/, names.get(i), types.get(i).getDescriptor(), null, null);
    }//w  ww .j av a 2 s.c om

    // Return value variable
    cv.visitField(0/*Opcodes.ACC_SYNTHETIC*/, "result", OBJECT_DESC, null, null);
    cv.visitField(0/*Opcodes.ACC_SYNTHETIC*/, "exception", THROWABLE_DESC, null, null);

    // Generate constructor
    MethodVisitor mv = cv.visitMethod(0, CTOR_NAME, DEFAULT_CTOR_DESC, null, null);
    mv.visitCode();
    Label start = new Label();
    Label end = new Label();
    mv.visitLabel(start);
    mv.visitLineNumber(0, start);

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, OBJECT_NAME, CTOR_NAME, DEFAULT_CTOR_DESC);
    mv.visitInsn(Opcodes.RETURN);
    mv.visitLabel(end);

    mv.visitLocalVariable("this", 'L' + name + ';', null, start, end, 0);

    mv.visitMaxs(1, 1);
    mv.visitEnd();

    cv.visitEnd();
}

---

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