Java Code Examples for jdk.internal.org.objectweb.asm.commons.InstructionAdapter#visitCode()

private void generateOverridingConstructorWithObjectParam(final InstructionAdapter mv, final Constructor<?> ctor, final String ctorDescriptor) {
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argTypes.length; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, ctorDescriptor, false);
    mv.visitVarInsn(ALOAD, offset);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ACONST_NULL);
    mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getHandle", GET_HANDLE_OBJECT_DESCRIPTOR, false);
    endInitMethod(mv);
}
 

private void generateDelegatingConstructor(final Constructor<?> ctor) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] argTypes = originalCtorType.getArgumentTypes();

    // All constructors must be public, even if in the superclass they were protected.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), argTypes), null, null));

    mv.visitCode();
    // Invoke super constructor with the same arguments.
    mv.visitVarInsn(ALOAD, 0);
    int offset = 1; // First arg is at position 1, after this.
    for (Type argType: argTypes) {
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor());

    endInitMethod(mv);
}
 

private void generateDelegatingConstructor(final Constructor<?> ctor) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] argTypes = originalCtorType.getArgumentTypes();

    // All constructors must be public, even if in the superclass they were protected.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC |
            (ctor.isVarArgs() ? ACC_VARARGS : 0), INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), argTypes), null, null));

    mv.visitCode();
    // Invoke super constructor with the same arguments.
    mv.visitVarInsn(ALOAD, 0);
    int offset = 1; // First arg is at position 1, after this.
    for (final Type argType: argTypes) {
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor(), false);

    endInitMethod(mv);
}
 

private void generateDelegatingConstructor(final Constructor<?> ctor) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] argTypes = originalCtorType.getArgumentTypes();

    // All constructors must be public, even if in the superclass they were protected.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC |
            (ctor.isVarArgs() ? ACC_VARARGS : 0), INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), argTypes), null, null));

    mv.visitCode();
    // Invoke super constructor with the same arguments.
    mv.visitVarInsn(ALOAD, 0);
    int offset = 1; // First arg is at position 1, after this.
    for (final Type argType: argTypes) {
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor(), false);

    endInitMethod(mv);
}
 

private void generateOverridingConstructorWithObjectParam(final InstructionAdapter mv, final Constructor<?> ctor, final String ctorDescriptor) {
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argTypes.length; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, ctorDescriptor, false);
    mv.visitVarInsn(ALOAD, offset);
    mv.visitInsn(ACONST_NULL);
    mv.visitInsn(ACONST_NULL);
    mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getHandle", GET_HANDLE_OBJECT_DESCRIPTOR, false);
    endInitMethod(mv);
}
 

private void generateSuperMethod(final MethodInfo mi) {
    final Method method = mi.method;

    final String methodDesc = mi.type.toMethodDescriptorString();
    final String name = mi.getName();

    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(getAccessModifiers(method),
            SUPER_PREFIX + name, methodDesc, null, getExceptionNames(method.getExceptionTypes())));
    mv.visitCode();

    emitSuperCall(mv, method.getDeclaringClass(), name, methodDesc);

    endMethod(mv);
}
 

private void generateSuperMethod(final MethodInfo mi) {
    final Method method = mi.method;

    final String methodDesc = mi.type.toMethodDescriptorString();
    final String name = mi.getName();

    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(getAccessModifiers(method),
            SUPER_PREFIX + name, methodDesc, null, getExceptionNames(method.getExceptionTypes())));
    mv.visitCode();

    emitSuperCall(mv, method.getDeclaringClass(), name, methodDesc);

    endMethod(mv);
}
 

/**
 * Generates a constructor for the adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|Object as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, scriptObj, args...).
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor());

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overriden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            mv.aconst(Type.getMethodType(mi.type.toMethodDescriptorString()));
            mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getHandle", getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleInstanceFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);

    endInitMethod(mv);
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

/**
 * Generates a constructor for the instance adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|ScriptObject as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : SCRIPT_OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, args..., scriptObj).
    // Any variable arity constructors become fixed-arity with explicit array arguments.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor(), false);

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overridden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            loadMethodTypeAndGetHandle(mv, mi, getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);

    // Initialize converters
    generateConverterInit(mv, fromFunction);
    endInitMethod(mv);

    if (! fromFunction) {
        newArgTypes[argLen] = OBJECT_TYPE;
        final InstructionAdapter mv2 = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
                Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));
        generateOverridingConstructorWithObjectParam(mv2, ctor, originalCtorType.getDescriptor());
    }
}
 

/**
 * Generates a constructor for the instance adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|ScriptObject as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : SCRIPT_OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, args..., scriptObj).
    // Any variable arity constructors become fixed-arity with explicit array arguments.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor(), false);

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overridden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            loadMethodTypeAndGetHandle(mv, mi, getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);

    // Initialize converters
    generateConverterInit(mv, fromFunction);
    endInitMethod(mv);

    if (! fromFunction) {
        newArgTypes[argLen] = OBJECT_TYPE;
        final InstructionAdapter mv2 = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
                Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));
        generateOverridingConstructorWithObjectParam(mv2, ctor, originalCtorType.getDescriptor());
    }
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

/**
 * Generates a constructor for the instance adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|Object as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, scriptObj, args...).
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor());

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overriden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            mv.aconst(Type.getMethodType(mi.type.toMethodDescriptorString()));
            mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getHandle", getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);

    endInitMethod(mv);
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

/**
 * Generates a constructor for the instance adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|ScriptObject as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : SCRIPT_OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, args..., scriptObj).
    // Any variable arity constructors become fixed-arity with explicit array arguments.
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor(), false);

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overriden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            loadMethodTypeAndGetHandle(mv, mi, getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);

    // Initialize converters
    generateConverterInit(mv, fromFunction);
    endInitMethod(mv);

    if (! fromFunction) {
        newArgTypes[argLen] = OBJECT_TYPE;
        final InstructionAdapter mv2 = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
                Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));
        generateOverridingConstructorWithObjectParam(mv2, ctor, originalCtorType.getDescriptor());
    }
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.lookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

private static MethodHandle createNoPermissionsInvoker() {
    final String className = "NoPermissionsInvoker";

    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
    cw.visit(Opcodes.V1_7, ACC_PUBLIC | ACC_SUPER | ACC_FINAL, className, null, "java/lang/Object", null);
    final Type objectType = Type.getType(Object.class);
    final Type methodHandleType = Type.getType(MethodHandle.class);
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "invoke",
            Type.getMethodDescriptor(Type.VOID_TYPE, methodHandleType, objectType), null, null));
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.invokevirtual(methodHandleType.getInternalName(), "invokeExact", Type.getMethodDescriptor(
            Type.VOID_TYPE, objectType), false);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
    cw.visitEnd();
    final byte[] bytes = cw.toByteArray();

    final ClassLoader loader = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
        @Override
        public ClassLoader run() {
            return new SecureClassLoader(null) {
                @Override
                protected Class<?> findClass(final String name) throws ClassNotFoundException {
                    if(name.equals(className)) {
                        return defineClass(name, bytes, 0, bytes.length, new ProtectionDomain(
                                new CodeSource(null, (CodeSigner[])null), new Permissions()));
                    }
                    throw new ClassNotFoundException(name);
                }
            };
        }
    });

    try {
        return MethodHandles.publicLookup().findStatic(Class.forName(className, true, loader), "invoke",
                MethodType.methodType(void.class, MethodHandle.class, Object.class));
    } catch(final ReflectiveOperationException e) {
        throw new AssertionError(e.getMessage(), e);
    }
}
 

/**
 * Generates a constructor for the instance adapter class. This constructor will take the same arguments as the supertype
 * constructor passed as the argument here, and delegate to it. However, it will take an additional argument of
 * either ScriptObject or ScriptFunction type (based on the value of the "fromFunction" parameter), and initialize
 * all the method handle fields of the adapter instance with functions from the script object (or the script
 * function itself, if that's what's passed). There is one method handle field in the adapter class for every method
 * that can be implemented or overridden; the name of every field is same as the name of the method, with a number
 * suffix that makes it unique in case of overloaded methods. The generated constructor will invoke
 * {@link #getHandle(ScriptFunction, MethodType, boolean)} or {@link #getHandle(Object, String, MethodType,
 * boolean)} to obtain the method handles; these methods make sure to add the necessary conversions and arity
 * adjustments so that the resulting method handles can be invoked from generated methods using {@code invokeExact}.
 * The constructor that takes a script function will only initialize the methods with the same name as the single
 * abstract method. The constructor will also store the Nashorn global that was current at the constructor
 * invocation time in a field named "global". The generated constructor will be public, regardless of whether the
 * supertype constructor was public or protected. The generated constructor will not be variable arity, even if the
 * supertype constructor was.
 * @param ctor the supertype constructor that is serving as the base for the generated constructor.
 * @param fromFunction true if we're generating a constructor that initializes SAM types from a single
 * ScriptFunction passed to it, false if we're generating a constructor that initializes an arbitrary type from a
 * ScriptObject passed to it.
 */
private void generateOverridingConstructor(final Constructor<?> ctor, final boolean fromFunction) {
    final Type originalCtorType = Type.getType(ctor);
    final Type[] originalArgTypes = originalCtorType.getArgumentTypes();
    final int argLen = originalArgTypes.length;
    final Type[] newArgTypes = new Type[argLen + 1];

    // Insert ScriptFunction|Object as the last argument to the constructor
    final Type extraArgumentType = fromFunction ? SCRIPT_FUNCTION_TYPE : OBJECT_TYPE;
    newArgTypes[argLen] = extraArgumentType;
    System.arraycopy(originalArgTypes, 0, newArgTypes, 0, argLen);

    // All constructors must be public, even if in the superclass they were protected.
    // Existing super constructor <init>(this, args...) triggers generating <init>(this, scriptObj, args...).
    final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, INIT,
            Type.getMethodDescriptor(originalCtorType.getReturnType(), newArgTypes), null, null));

    mv.visitCode();
    // First, invoke super constructor with original arguments. If the form of the constructor we're generating is
    // <init>(this, args..., scriptFn), then we're invoking super.<init>(this, args...).
    mv.visitVarInsn(ALOAD, 0);
    final Class<?>[] argTypes = ctor.getParameterTypes();
    int offset = 1; // First arg is at position 1, after this.
    for (int i = 0; i < argLen; ++i) {
        final Type argType = Type.getType(argTypes[i]);
        mv.load(offset, argType);
        offset += argType.getSize();
    }
    mv.invokespecial(superClassName, INIT, originalCtorType.getDescriptor());

    // Get a descriptor to the appropriate "JavaAdapterFactory.getHandle" method.
    final String getHandleDescriptor = fromFunction ? GET_HANDLE_FUNCTION_DESCRIPTOR : GET_HANDLE_OBJECT_DESCRIPTOR;

    // Assign MethodHandle fields through invoking getHandle()
    for (final MethodInfo mi : methodInfos) {
        mv.visitVarInsn(ALOAD, 0);
        if (fromFunction && !mi.getName().equals(samName)) {
            // Constructors initializing from a ScriptFunction only initialize methods with the SAM name.
            // NOTE: if there's a concrete overloaded method sharing the SAM name, it'll be overriden too. This
            // is a deliberate design choice. All other method handles are initialized to null.
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitVarInsn(ALOAD, offset);
            if(!fromFunction) {
                mv.aconst(mi.getName());
            }
            mv.aconst(Type.getMethodType(mi.type.toMethodDescriptorString()));
            mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getHandle", getHandleDescriptor);
        }
        mv.putfield(generatedClassName, mi.methodHandleFieldName, METHOD_HANDLE_TYPE_DESCRIPTOR);
    }

    // Assign "this.global = Context.getGlobal()"
    mv.visitVarInsn(ALOAD, 0);
    invokeGetGlobalWithNullCheck(mv);
    mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);

    endInitMethod(mv);
}