--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java 2020-04-15 18:51:00.000000000 +0530 +++ /dev/null 2020-04-15 18:51:00.000000000 +0530 @@ -1,1237 +0,0 @@ -/* - * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package jdk.nashorn.internal.runtime.linker; - -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_FINAL; -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PRIVATE; -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC; -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_STATIC; -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_SUPER; -import static jdk.internal.org.objectweb.asm.Opcodes.ACC_VARARGS; -import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD; -import static jdk.internal.org.objectweb.asm.Opcodes.ASTORE; -import static jdk.internal.org.objectweb.asm.Opcodes.D2F; -import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESTATIC; -import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL; -import static jdk.internal.org.objectweb.asm.Opcodes.I2B; -import static jdk.internal.org.objectweb.asm.Opcodes.I2S; -import static jdk.internal.org.objectweb.asm.Opcodes.RETURN; -import static jdk.nashorn.internal.codegen.CompilerConstants.interfaceCallNoLookup; -import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup; -import static jdk.nashorn.internal.lookup.Lookup.MH; -import static jdk.nashorn.internal.runtime.linker.AdaptationResult.Outcome.ERROR_NO_ACCESSIBLE_CONSTRUCTOR; - -import java.lang.invoke.CallSite; -import java.lang.invoke.MethodHandle; -import java.lang.invoke.MethodHandles.Lookup; -import java.lang.invoke.MethodType; -import java.lang.reflect.AccessibleObject; -import java.lang.reflect.Constructor; -import java.lang.reflect.Method; -import java.lang.reflect.Modifier; -import java.security.AccessControlContext; -import java.security.AccessController; -import java.security.PrivilegedAction; -import java.security.ProtectionDomain; -import java.util.Arrays; -import java.util.Collection; -import java.util.HashSet; -import java.util.Iterator; -import java.util.List; -import java.util.Set; -import jdk.internal.org.objectweb.asm.ClassWriter; -import jdk.internal.org.objectweb.asm.Handle; -import jdk.internal.org.objectweb.asm.Label; -import jdk.internal.org.objectweb.asm.Opcodes; -import jdk.internal.org.objectweb.asm.Type; -import jdk.internal.org.objectweb.asm.commons.InstructionAdapter; -import jdk.nashorn.api.scripting.ScriptObjectMirror; -import jdk.nashorn.api.scripting.ScriptUtils; -import jdk.nashorn.internal.codegen.CompilerConstants.Call; -import jdk.nashorn.internal.runtime.ScriptFunction; -import jdk.nashorn.internal.runtime.ScriptObject; -import jdk.nashorn.internal.runtime.linker.AdaptationResult.Outcome; -import jdk.internal.reflect.CallerSensitive; - -/** - * Generates bytecode for a Java adapter class. Used by the {@link JavaAdapterFactory}. - *

- * For every protected or public constructor in the extended class, the adapter class will have either one or two - * public constructors (visibility of protected constructors in the extended class is promoted to public). - *

  • - *
  • For adapter classes with instance-level overrides, a constructor taking a trailing ScriptObject argument preceded - * by original constructor arguments is always created on the adapter class. When such a constructor is invoked, the - * passed ScriptObject's member functions are used to implement and/or override methods on the original class, - * dispatched by name. A single JavaScript function will act as the implementation for all overloaded methods of the - * same name. When methods on an adapter instance are invoked, the functions are invoked having the ScriptObject passed - * in the instance constructor as their "this". Subsequent changes to the ScriptObject (reassignment or removal of its - * functions) will be reflected in the adapter instance as it is live dispatching to its members on every method invocation. - * {@code java.lang.Object} methods {@code equals}, {@code hashCode}, and {@code toString} can also be overridden. The - * only restriction is that since every JavaScript object already has a {@code toString} function through the - * {@code Object.prototype}, the {@code toString} in the adapter is only overridden if the passed ScriptObject has a - * {@code toString} function as its own property, and not inherited from a prototype. All other adapter methods can be - * implemented or overridden through a prototype-inherited function of the ScriptObject passed to the constructor too. - *
    • - *
  • - * If the original types collectively have only one abstract method, or have several of them, but all share the - * same name, an additional constructor for instance-level override adapter is provided for every original constructor; - * this one takes a ScriptFunction as its last argument preceded by original constructor arguments. This constructor - * will use the passed function as the implementation for all abstract methods. For consistency, any concrete methods - * sharing the single abstract method name will also be overridden by the function. When methods on the adapter instance - * are invoked, the ScriptFunction is invoked with UNDEFINED or Global as its "this" depending whether the function is - * strict or not. - *
    • - *
  • - * If the adapter being generated has class-level overrides, constructors taking same arguments as the superclass - * constructors are created. These constructors simply delegate to the superclass constructor. They are simply used to - * create instances of the adapter class, with no instance-level overrides, as they don't have them. If the original - * class' constructor was variable arity, the adapter constructor will also be variable arity. Protected constructors - * are exposed as public. - *
    • - * - *

    - * For adapter methods that return values, all the JavaScript-to-Java conversions supported by Nashorn will be in effect - * to coerce the JavaScript function return value to the expected Java return type. - *

    - * Since we are adding a trailing argument to the generated constructors in the adapter class with instance-level overrides, they will never be - * declared as variable arity, even if the original constructor in the superclass was declared as variable arity. The - * reason we are passing the additional argument at the end of the argument list instead at the front is that the - * source-level script expression new X(a, b) { ... } (which is a proprietary syntax extension Nashorn uses - * to resemble Java anonymous classes) is actually equivalent to new X(a, b, { ... }). - *

    - * It is possible to create two different adapter classes: those that can have class-level overrides, and those that can - * have instance-level overrides. When {@link JavaAdapterFactory#getAdapterClassFor(Class[], ScriptObject, ProtectionDomain)} - * or {@link JavaAdapterFactory#getAdapterClassFor(Class[], ScriptObject, Lookup)} is invoked - * with non-null {@code classOverrides} parameter, an adapter class is created that can have class-level overrides, and - * the passed script object will be used as the implementations for its methods, just as in the above case of the - * constructor taking a script object. Note that in the case of class-level overrides, a new adapter class is created on - * every invocation, and the implementation object is bound to the class, not to any instance. All created instances - * will share these functions. If it is required to have both class-level overrides and instance-level overrides, the - * class-level override adapter class should be subclassed with an instance-override adapter. Since adapters delegate to - * super class when an overriding method handle is not specified, this will behave as expected. It is not possible to - * have both class-level and instance-level overrides in the same class for security reasons: adapter classes are - * defined with a protection domain of their creator code, and an adapter class that has both class and instance level - * overrides would need to have two potentially different protection domains: one for class-based behavior and one for - * instance-based behavior; since Java classes can only belong to a single protection domain, this could not be - * implemented securely. - */ -final class JavaAdapterBytecodeGenerator { - // Field names in adapters - private static final String GLOBAL_FIELD_NAME = "global"; - private static final String DELEGATE_FIELD_NAME = "delegate"; - private static final String IS_FUNCTION_FIELD_NAME = "isFunction"; - private static final String CALL_THIS_FIELD_NAME = "callThis"; - - // Initializer names - private static final String INIT = ""; - private static final String CLASS_INIT = ""; - - // Types often used in generated bytecode - private static final Type OBJECT_TYPE = Type.getType(Object.class); - private static final Type SCRIPT_OBJECT_TYPE = Type.getType(ScriptObject.class); - private static final Type SCRIPT_FUNCTION_TYPE = Type.getType(ScriptFunction.class); - private static final Type SCRIPT_OBJECT_MIRROR_TYPE = Type.getType(ScriptObjectMirror.class); - - // JavaAdapterServices methods used in generated bytecode - private static final Call CHECK_FUNCTION = lookupServiceMethod("checkFunction", ScriptFunction.class, Object.class, String.class); - private static final Call EXPORT_RETURN_VALUE = lookupServiceMethod("exportReturnValue", Object.class, Object.class); - private static final Call GET_CALL_THIS = lookupServiceMethod("getCallThis", Object.class, ScriptFunction.class, Object.class); - private static final Call GET_CLASS_OVERRIDES = lookupServiceMethod("getClassOverrides", ScriptObject.class); - private static final Call GET_NON_NULL_GLOBAL = lookupServiceMethod("getNonNullGlobal", ScriptObject.class); - private static final Call HAS_OWN_TO_STRING = lookupServiceMethod("hasOwnToString", boolean.class, ScriptObject.class); - private static final Call INVOKE_NO_PERMISSIONS = lookupServiceMethod("invokeNoPermissions", void.class, MethodHandle.class, Object.class); - private static final Call NOT_AN_OBJECT = lookupServiceMethod("notAnObject", void.class, Object.class); - private static final Call SET_GLOBAL = lookupServiceMethod("setGlobal", Runnable.class, ScriptObject.class); - private static final Call TO_CHAR_PRIMITIVE = lookupServiceMethod("toCharPrimitive", char.class, Object.class); - private static final Call UNSUPPORTED = lookupServiceMethod("unsupported", UnsupportedOperationException.class); - private static final Call WRAP_THROWABLE = lookupServiceMethod("wrapThrowable", RuntimeException.class, Throwable.class); - private static final Call UNWRAP_MIRROR = lookupServiceMethod("unwrapMirror", ScriptObject.class, Object.class, boolean.class); - - // Other methods invoked by the generated bytecode - private static final Call UNWRAP = staticCallNoLookup(ScriptUtils.class, "unwrap", Object.class, Object.class); - private static final Call CHAR_VALUE_OF = staticCallNoLookup(Character.class, "valueOf", Character.class, char.class); - private static final Call DOUBLE_VALUE_OF = staticCallNoLookup(Double.class, "valueOf", Double.class, double.class); - private static final Call LONG_VALUE_OF = staticCallNoLookup(Long.class, "valueOf", Long.class, long.class); - private static final Call RUN = interfaceCallNoLookup(Runnable.class, "run", void.class); - - // ASM handle to the bootstrap method - private static final Handle BOOTSTRAP_HANDLE = new Handle(H_INVOKESTATIC, - Type.getInternalName(JavaAdapterServices.class), "bootstrap", - MethodType.methodType(CallSite.class, Lookup.class, String.class, - MethodType.class, int.class).toMethodDescriptorString(), false); - - // ASM handle to the bootstrap method for array populator - private static final Handle CREATE_ARRAY_BOOTSTRAP_HANDLE = new Handle(H_INVOKESTATIC, - Type.getInternalName(JavaAdapterServices.class), "createArrayBootstrap", - MethodType.methodType(CallSite.class, Lookup.class, String.class, - MethodType.class).toMethodDescriptorString(), false); - - // Field type names used in the generated bytecode - private static final String SCRIPT_OBJECT_TYPE_DESCRIPTOR = SCRIPT_OBJECT_TYPE.getDescriptor(); - private static final String OBJECT_TYPE_DESCRIPTOR = OBJECT_TYPE.getDescriptor(); - private static final String BOOLEAN_TYPE_DESCRIPTOR = Type.BOOLEAN_TYPE.getDescriptor(); - - // Throwable names used in the generated bytecode - private static final String RUNTIME_EXCEPTION_TYPE_NAME = Type.getInternalName(RuntimeException.class); - private static final String ERROR_TYPE_NAME = Type.getInternalName(Error.class); - private static final String THROWABLE_TYPE_NAME = Type.getInternalName(Throwable.class); - - // Some more frequently used method descriptors - private static final String GET_METHOD_PROPERTY_METHOD_DESCRIPTOR = Type.getMethodDescriptor(OBJECT_TYPE, SCRIPT_OBJECT_TYPE); - private static final String VOID_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE); - - private static final String ADAPTER_PACKAGE_INTERNAL = "jdk/nashorn/javaadapters/"; - private static final int MAX_GENERATED_TYPE_NAME_LENGTH = 255; - - // Method name prefix for invoking super-methods - static final String SUPER_PREFIX = "super$"; - - // Method name and type for the no-privilege finalizer delegate - private static final String FINALIZER_DELEGATE_NAME = "$$nashornFinalizerDelegate"; - private static final String FINALIZER_DELEGATE_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE, OBJECT_TYPE); - - /** - * Collection of methods we never override: Object.clone(), Object.finalize(). - */ - private static final Collection EXCLUDED = getExcludedMethods(); - - // This is the superclass for our generated adapter. - private final Class superClass; - // Interfaces implemented by our generated adapter. - private final List> interfaces; - // Class loader used as the parent for the class loader we'll create to load the generated class. It will be a class - // loader that has the visibility of all original types (class to extend and interfaces to implement) and of the - // Nashorn classes. - private final ClassLoader commonLoader; - // Is this a generator for the version of the class that can have overrides on the class level? - private final boolean classOverride; - // Binary name of the superClass - private final String superClassName; - // Binary name of the generated class. - private final String generatedClassName; - private final Set abstractMethodNames = new HashSet<>(); - private final String samName; - private final Set finalMethods = new HashSet<>(EXCLUDED); - private final Set methodInfos = new HashSet<>(); - private final boolean autoConvertibleFromFunction; - private boolean hasExplicitFinalizer = false; - - private final ClassWriter cw; - - /** - * Creates a generator for the bytecode for the adapter for the specified superclass and interfaces. - * @param superClass the superclass the adapter will extend. - * @param interfaces the interfaces the adapter will implement. - * @param commonLoader the class loader that can see all of superClass, interfaces, and Nashorn classes. - * @param classOverride true to generate the bytecode for the adapter that has class-level overrides, false to - * generate the bytecode for the adapter that has instance-level overrides. - * @throws AdaptationException if the adapter can not be generated for some reason. - */ - JavaAdapterBytecodeGenerator(final Class superClass, final List> interfaces, - final ClassLoader commonLoader, final boolean classOverride) throws AdaptationException { - assert superClass != null && !superClass.isInterface(); - assert interfaces != null; - - this.superClass = superClass; - this.interfaces = interfaces; - this.classOverride = classOverride; - this.commonLoader = commonLoader; - cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS) { - @Override - protected String getCommonSuperClass(final String type1, final String type2) { - // We need to override ClassWriter.getCommonSuperClass to use this factory's commonLoader as a class - // loader to find the common superclass of two types when needed. - return JavaAdapterBytecodeGenerator.this.getCommonSuperClass(type1, type2); - } - }; - superClassName = Type.getInternalName(superClass); - generatedClassName = getGeneratedClassName(superClass, interfaces); - - cw.visit(Opcodes.V1_8, ACC_PUBLIC | ACC_SUPER, generatedClassName, null, superClassName, getInternalTypeNames(interfaces)); - generateField(GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - generateField(DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - gatherMethods(superClass); - gatherMethods(interfaces); - if (abstractMethodNames.size() == 1) { - samName = abstractMethodNames.iterator().next(); - generateField(CALL_THIS_FIELD_NAME, OBJECT_TYPE_DESCRIPTOR); - generateField(IS_FUNCTION_FIELD_NAME, BOOLEAN_TYPE_DESCRIPTOR); - } else { - samName = null; - } - if(classOverride) { - generateClassInit(); - } - autoConvertibleFromFunction = generateConstructors(); - generateMethods(); - generateSuperMethods(); - if (hasExplicitFinalizer) { - generateFinalizerMethods(); - } - // } - cw.visitEnd(); - } - - private void generateField(final String name, final String fieldDesc) { - cw.visitField(ACC_PRIVATE | ACC_FINAL | (classOverride ? ACC_STATIC : 0), name, fieldDesc, null, null).visitEnd(); - } - - JavaAdapterClassLoader createAdapterClassLoader() { - return new JavaAdapterClassLoader(generatedClassName, cw.toByteArray()); - } - - boolean isAutoConvertibleFromFunction() { - return autoConvertibleFromFunction; - } - - private static String getGeneratedClassName(final Class superType, final List> interfaces) { - // The class we use to primarily name our adapter is either the superclass, or if it is Object (meaning we're - // just implementing interfaces or extending Object), then the first implemented interface or Object. - final Class namingType = superType == Object.class ? (interfaces.isEmpty()? Object.class : interfaces.get(0)) : superType; - final Package pkg = namingType.getPackage(); - final String namingTypeName = Type.getInternalName(namingType); - final StringBuilder buf = new StringBuilder(); - buf.append(ADAPTER_PACKAGE_INTERNAL).append(namingTypeName.replace('/', '_')); - final Iterator> it = interfaces.iterator(); - if(superType == Object.class && it.hasNext()) { - it.next(); // Skip first interface, it was used to primarily name the adapter - } - // Append interface names to the adapter name - while(it.hasNext()) { - buf.append("$$").append(it.next().getSimpleName()); - } - return buf.toString().substring(0, Math.min(MAX_GENERATED_TYPE_NAME_LENGTH, buf.length())); - } - - /** - * Given a list of class objects, return an array with their binary names. Used to generate the array of interface - * names to implement. - * @param classes the classes - * @return an array of names - */ - private static String[] getInternalTypeNames(final List> classes) { - final int interfaceCount = classes.size(); - final String[] interfaceNames = new String[interfaceCount]; - for(int i = 0; i < interfaceCount; ++i) { - interfaceNames[i] = Type.getInternalName(classes.get(i)); - } - return interfaceNames; - } - - private void generateClassInit() { - final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_STATIC, CLASS_INIT, - VOID_METHOD_DESCRIPTOR, null, null)); - - // Assign "global = Context.getGlobal()" - GET_NON_NULL_GLOBAL.invoke(mv); - mv.putstatic(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - GET_CLASS_OVERRIDES.invoke(mv); - if(samName != null) { - // If the class is a SAM, allow having ScriptFunction passed as class overrides - mv.dup(); - mv.instanceOf(SCRIPT_FUNCTION_TYPE); - mv.dup(); - mv.putstatic(generatedClassName, IS_FUNCTION_FIELD_NAME, BOOLEAN_TYPE_DESCRIPTOR); - final Label notFunction = new Label(); - mv.ifeq(notFunction); - mv.dup(); - mv.checkcast(SCRIPT_FUNCTION_TYPE); - emitInitCallThis(mv); - mv.visitLabel(notFunction); - } - mv.putstatic(generatedClassName, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - endInitMethod(mv); - } - - /** - * Emit bytecode for initializing the "callThis" field. - */ - private void emitInitCallThis(final InstructionAdapter mv) { - loadField(mv, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - GET_CALL_THIS.invoke(mv); - if(classOverride) { - mv.putstatic(generatedClassName, CALL_THIS_FIELD_NAME, OBJECT_TYPE_DESCRIPTOR); - } else { - // It is presumed ALOAD 0 was already executed - mv.putfield(generatedClassName, CALL_THIS_FIELD_NAME, OBJECT_TYPE_DESCRIPTOR); - } - } - - private boolean generateConstructors() throws AdaptationException { - boolean gotCtor = false; - boolean canBeAutoConverted = false; - for (final Constructor ctor: superClass.getDeclaredConstructors()) { - final int modifier = ctor.getModifiers(); - if((modifier & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0 && !isCallerSensitive(ctor)) { - canBeAutoConverted = generateConstructors(ctor) | canBeAutoConverted; - gotCtor = true; - } - } - if(!gotCtor) { - throw new AdaptationException(ERROR_NO_ACCESSIBLE_CONSTRUCTOR, superClass.getCanonicalName()); - } - return canBeAutoConverted; - } - - private boolean generateConstructors(final Constructor ctor) { - if(classOverride) { - // Generate a constructor that just delegates to ctor. This is used with class-level overrides, when we want - // to create instances without further per-instance overrides. - generateDelegatingConstructor(ctor); - return false; - } - - // Generate a constructor that delegates to ctor, but takes an additional ScriptObject parameter at the - // beginning of its parameter list. - generateOverridingConstructor(ctor, false); - - if (samName == null) { - return false; - } - // If all our abstract methods have a single name, generate an additional constructor, one that takes a - // ScriptFunction as its first parameter and assigns it as the implementation for all abstract methods. - generateOverridingConstructor(ctor, true); - // If the original type only has a single abstract method name, as well as a default ctor, then it can - // be automatically converted from JS function. - return ctor.getParameterTypes().length == 0; - } - - 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(); - emitSuperConstructorCall(mv, originalCtorType.getDescriptor()); - - endInitMethod(mv); - } - - /** - * 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). Additionally, it will create another constructor with an additional - * Object type parameter that can be used for ScriptObjectMirror objects. - * 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 (this, args...) triggers generating (this, args..., delegate). - // 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. - final int extraArgOffset = emitSuperConstructorCall(mv, originalCtorType.getDescriptor()); - - // Assign "this.global = Context.getGlobal()" - mv.visitVarInsn(ALOAD, 0); - GET_NON_NULL_GLOBAL.invoke(mv); - mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - // Assign "this.delegate = delegate" - mv.visitVarInsn(ALOAD, 0); - mv.visitVarInsn(ALOAD, extraArgOffset); - mv.putfield(generatedClassName, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - if (fromFunction) { - // Assign "isFunction = true" - mv.visitVarInsn(ALOAD, 0); - mv.iconst(1); - mv.putfield(generatedClassName, IS_FUNCTION_FIELD_NAME, BOOLEAN_TYPE_DESCRIPTOR); - - mv.visitVarInsn(ALOAD, 0); - mv.visitVarInsn(ALOAD, extraArgOffset); - emitInitCallThis(mv); - } - - 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, originalCtorType.getDescriptor()); - } - } - - // Object additional param accepting constructor for handling ScriptObjectMirror objects, which are - // unwrapped to work as ScriptObjects or ScriptFunctions. This also handles null and undefined values for - // script adapters by throwing TypeError on such script adapters. - private void generateOverridingConstructorWithObjectParam(final InstructionAdapter mv, final String ctorDescriptor) { - mv.visitCode(); - final int extraArgOffset = emitSuperConstructorCall(mv, ctorDescriptor); - - // Check for ScriptObjectMirror - mv.visitVarInsn(ALOAD, extraArgOffset); - mv.instanceOf(SCRIPT_OBJECT_MIRROR_TYPE); - final Label notMirror = new Label(); - mv.ifeq(notMirror); - - mv.visitVarInsn(ALOAD, 0); - mv.visitVarInsn(ALOAD, extraArgOffset); - mv.iconst(0); - UNWRAP_MIRROR.invoke(mv); - mv.putfield(generatedClassName, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - mv.visitVarInsn(ALOAD, 0); - mv.visitVarInsn(ALOAD, extraArgOffset); - mv.iconst(1); - UNWRAP_MIRROR.invoke(mv); - mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - - final Label done = new Label(); - - if (samName != null) { - mv.visitVarInsn(ALOAD, 0); - mv.getfield(generatedClassName, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - mv.instanceOf(SCRIPT_FUNCTION_TYPE); - mv.ifeq(done); - - // Assign "isFunction = true" - mv.visitVarInsn(ALOAD, 0); - mv.iconst(1); - mv.putfield(generatedClassName, IS_FUNCTION_FIELD_NAME, BOOLEAN_TYPE_DESCRIPTOR); - - mv.visitVarInsn(ALOAD, 0); - mv.dup(); - mv.getfield(generatedClassName, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - mv.checkcast(SCRIPT_FUNCTION_TYPE); - emitInitCallThis(mv); - mv.goTo(done); - } - - mv.visitLabel(notMirror); - - // Throw error if not a ScriptObject - mv.visitVarInsn(ALOAD, extraArgOffset); - NOT_AN_OBJECT.invoke(mv); - - mv.visitLabel(done); - endInitMethod(mv); - } - - private static void endInitMethod(final InstructionAdapter mv) { - mv.visitInsn(RETURN); - endMethod(mv); - } - - private static void endMethod(final InstructionAdapter mv) { - mv.visitMaxs(0, 0); - mv.visitEnd(); - } - - /** - * Encapsulation of the information used to generate methods in the adapter classes. Basically, a wrapper around the - * reflective Method object, a cached MethodType, and the name of the field in the adapter class that will hold the - * method handle serving as the implementation of this method in adapter instances. - * - */ - private static class MethodInfo { - private final Method method; - private final MethodType type; - - private MethodInfo(final Class clazz, final String name, final Class... argTypes) throws NoSuchMethodException { - this(clazz.getDeclaredMethod(name, argTypes)); - } - - private MethodInfo(final Method method) { - this.method = method; - this.type = MH.type(method.getReturnType(), method.getParameterTypes()); - } - - @Override - public boolean equals(final Object obj) { - return obj instanceof MethodInfo && equals((MethodInfo)obj); - } - - private boolean equals(final MethodInfo other) { - // Only method name and type are used for comparison; method handle field name is not. - return getName().equals(other.getName()) && type.equals(other.type); - } - - String getName() { - return method.getName(); - } - - @Override - public int hashCode() { - return getName().hashCode() ^ type.hashCode(); - } - } - - private void generateMethods() { - for(final MethodInfo mi: methodInfos) { - generateMethod(mi); - } - } - - /** - * Generates a method in the adapter class that adapts a method from the - * original class. The generated method will either invoke the delegate - * using a CALL dynamic operation call site (if it is a SAM method and the - * delegate is a ScriptFunction), or invoke GET_METHOD_PROPERTY dynamic - * operation with the method name as the argument and then invoke the - * returned ScriptFunction using the CALL dynamic operation. If - * GET_METHOD_PROPERTY returns null or undefined (that is, the JS object - * doesn't provide an implementation for the method) then the method will - * either do a super invocation to base class, or if the method is abstract, - * throw an {@link UnsupportedOperationException}. Finally, if - * GET_METHOD_PROPERTY returns something other than a ScriptFunction, null, - * or undefined, a TypeError is thrown. The current Global is checked before - * the dynamic operations, and if it is different than the Global used to - * create the adapter, the creating Global is set to be the current Global. - * In this case, the previously current Global is restored after the - * invocation. If CALL results in a Throwable that is not one of the - * method's declared exceptions, and is not an unchecked throwable, then it - * is wrapped into a {@link RuntimeException} and the runtime exception is - * thrown. - * @param mi the method info describing the method to be generated. - */ - private void generateMethod(final MethodInfo mi) { - final Method method = mi.method; - final Class[] exceptions = method.getExceptionTypes(); - final String[] exceptionNames = getExceptionNames(exceptions); - final MethodType type = mi.type; - final String methodDesc = type.toMethodDescriptorString(); - final String name = mi.getName(); - - final Type asmType = Type.getMethodType(methodDesc); - final Type[] asmArgTypes = asmType.getArgumentTypes(); - - final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(getAccessModifiers(method), name, - methodDesc, null, exceptionNames)); - mv.visitCode(); - - final Class returnType = type.returnType(); - final Type asmReturnType = Type.getType(returnType); - - // Determine the first index for a local variable - int nextLocalVar = 1; // "this" is at 0 - for(final Type t: asmArgTypes) { - nextLocalVar += t.getSize(); - } - // Set our local variable index - final int globalRestoringRunnableVar = nextLocalVar++; - - // Load the creatingGlobal object - loadField(mv, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - // stack: [creatingGlobal] - SET_GLOBAL.invoke(mv); - // stack: [runnable] - mv.visitVarInsn(ASTORE, globalRestoringRunnableVar); - // stack: [] - - final Label tryBlockStart = new Label(); - mv.visitLabel(tryBlockStart); - - final Label callCallee = new Label(); - final Label defaultBehavior = new Label(); - // If this is a SAM type... - if (samName != null) { - // ...every method will be checking whether we're initialized with a - // function. - loadField(mv, IS_FUNCTION_FIELD_NAME, BOOLEAN_TYPE_DESCRIPTOR); - // stack: [isFunction] - if (name.equals(samName)) { - final Label notFunction = new Label(); - mv.ifeq(notFunction); - // stack: [] - // If it's a SAM method, it'll load delegate as the "callee" and - // "callThis" as "this" for the call if delegate is a function. - loadField(mv, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - // NOTE: if we added "mv.checkcast(SCRIPT_FUNCTION_TYPE);" here - // we could emit the invokedynamic CALL instruction with signature - // (ScriptFunction, Object, ...) instead of (Object, Object, ...). - // We could combine this with an optimization in - // ScriptFunction.findCallMethod where it could link a call with a - // thinner guard when the call site statically guarantees that the - // callee argument is a ScriptFunction. Additionally, we could use - // a "ScriptFunction function" field in generated classes instead - // of a "boolean isFunction" field to avoid the checkcast. - loadField(mv, CALL_THIS_FIELD_NAME, OBJECT_TYPE_DESCRIPTOR); - // stack: [callThis, delegate] - mv.goTo(callCallee); - mv.visitLabel(notFunction); - } else { - // If it's not a SAM method, and the delegate is a function, - // it'll fall back to default behavior - mv.ifne(defaultBehavior); - // stack: [] - } - } - - // At this point, this is either not a SAM method or the delegate is - // not a ScriptFunction. We need to emit a GET_METHOD_PROPERTY Nashorn - // invokedynamic. - - if(name.equals("toString")) { - // Since every JS Object has a toString, we only override - // "String toString()" it if it's explicitly specified on the object. - loadField(mv, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - // stack: [delegate] - HAS_OWN_TO_STRING.invoke(mv); - // stack: [hasOwnToString] - mv.ifeq(defaultBehavior); - } - - loadField(mv, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - //For the cases like scripted overridden methods invoked from super constructors get adapter global/delegate fields as null, since we - //cannot set these fields before invoking super constructor better solution is opt out of scripted overridden method if global/delegate fields - //are null and invoke super method instead - mv.ifnull(defaultBehavior); - loadField(mv, DELEGATE_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR); - mv.dup(); - // stack: [delegate, delegate] - final String encodedName = NameCodec.encode(name); - mv.visitInvokeDynamicInsn(encodedName, - GET_METHOD_PROPERTY_METHOD_DESCRIPTOR, BOOTSTRAP_HANDLE, - NashornCallSiteDescriptor.GET_METHOD_PROPERTY); - // stack: [callee, delegate] - mv.visitLdcInsn(name); - // stack: [name, callee, delegate] - CHECK_FUNCTION.invoke(mv); - // stack: [fnCalleeOrNull, delegate] - final Label hasFunction = new Label(); - mv.dup(); - // stack: [fnCalleeOrNull, fnCalleeOrNull, delegate] - mv.ifnonnull(hasFunction); - // stack: [null, delegate] - // If it's null or undefined, clear stack and fall back to default - // behavior. - mv.pop2(); - // stack: [] - - // We can also arrive here from check for "delegate instanceof ScriptFunction" - // in a non-SAM method as well as from a check for "hasOwnToString(delegate)" - // for a toString delegate. - mv.visitLabel(defaultBehavior); - final Runnable emitFinally = ()->emitFinally(mv, globalRestoringRunnableVar); - final Label normalFinally = new Label(); - if(Modifier.isAbstract(method.getModifiers())) { - // If the super method is abstract, throw UnsupportedOperationException - UNSUPPORTED.invoke(mv); - // NOTE: no need to invoke emitFinally.run() as we're inside the - // tryBlockStart/tryBlockEnd range, so throwing this exception will - // transfer control to the rethrow handler and the finally block in it - // will execute. - mv.athrow(); - } else { - // If the super method is not abstract, delegate to it. - emitSuperCall(mv, method.getDeclaringClass(), name, methodDesc); - mv.goTo(normalFinally); - } - - mv.visitLabel(hasFunction); - // stack: [callee, delegate] - mv.swap(); - // stack [delegate, callee] - mv.visitLabel(callCallee); - - - // Load all parameters back on stack for dynamic invocation. - - int varOffset = 1; - // If the param list length is more than 253 slots, we can't invoke it - // directly as with (callee, this) it'll exceed 255. - final boolean isVarArgCall = getParamListLengthInSlots(asmArgTypes) > 253; - for (final Type t : asmArgTypes) { - mv.load(varOffset, t); - convertParam(mv, t, isVarArgCall); - varOffset += t.getSize(); - } - // stack: [args..., callee, delegate] - - // If the resulting parameter list length is too long... - if (isVarArgCall) { - // ... we pack the parameters (except callee and this) into an array - // and use Nashorn vararg invocation. - mv.visitInvokeDynamicInsn(NameCodec.EMPTY_NAME, - getArrayCreatorMethodType(type).toMethodDescriptorString(), - CREATE_ARRAY_BOOTSTRAP_HANDLE); - } - - // Invoke the target method handle - mv.visitInvokeDynamicInsn(encodedName, - getCallMethodType(isVarArgCall, type).toMethodDescriptorString(), - BOOTSTRAP_HANDLE, NashornCallSiteDescriptor.CALL); - // stack: [returnValue] - convertReturnValue(mv, returnType); - mv.visitLabel(normalFinally); - emitFinally.run(); - mv.areturn(asmReturnType); - - // If Throwable is not declared, we need an adapter from Throwable to RuntimeException - final boolean throwableDeclared = isThrowableDeclared(exceptions); - final Label throwableHandler; - if (!throwableDeclared) { - // Add "throw new RuntimeException(Throwable)" handler for Throwable - throwableHandler = new Label(); - mv.visitLabel(throwableHandler); - WRAP_THROWABLE.invoke(mv); - // Fall through to rethrow handler - } else { - throwableHandler = null; - } - final Label rethrowHandler = new Label(); - mv.visitLabel(rethrowHandler); - // Rethrow handler for RuntimeException, Error, and all declared exception types - emitFinally.run(); - mv.athrow(); - - if(throwableDeclared) { - mv.visitTryCatchBlock(tryBlockStart, normalFinally, rethrowHandler, THROWABLE_TYPE_NAME); - assert throwableHandler == null; - } else { - mv.visitTryCatchBlock(tryBlockStart, normalFinally, rethrowHandler, RUNTIME_EXCEPTION_TYPE_NAME); - mv.visitTryCatchBlock(tryBlockStart, normalFinally, rethrowHandler, ERROR_TYPE_NAME); - for(final String excName: exceptionNames) { - mv.visitTryCatchBlock(tryBlockStart, normalFinally, rethrowHandler, excName); - } - mv.visitTryCatchBlock(tryBlockStart, normalFinally, throwableHandler, THROWABLE_TYPE_NAME); - } - endMethod(mv); - } - - private static MethodType getCallMethodType(final boolean isVarArgCall, final MethodType type) { - final Class[] callParamTypes; - if (isVarArgCall) { - // Variable arity calls are always (Object callee, Object this, Object[] params) - callParamTypes = new Class[] { Object.class, Object.class, Object[].class }; - } else { - // Adjust invocation type signature for conversions we instituted in - // convertParam; also, byte and short get passed as ints. - final Class[] origParamTypes = type.parameterArray(); - callParamTypes = new Class[origParamTypes.length + 2]; - callParamTypes[0] = Object.class; // callee; could be ScriptFunction.class ostensibly - callParamTypes[1] = Object.class; // this - for(int i = 0; i < origParamTypes.length; ++i) { - callParamTypes[i + 2] = getNashornParamType(origParamTypes[i], false); - } - } - return MethodType.methodType(getNashornReturnType(type.returnType()), callParamTypes); - } - - private static MethodType getArrayCreatorMethodType(final MethodType type) { - final Class[] callParamTypes = type.parameterArray(); - for(int i = 0; i < callParamTypes.length; ++i) { - callParamTypes[i] = getNashornParamType(callParamTypes[i], true); - } - return MethodType.methodType(Object[].class, callParamTypes); - } - - private static Class getNashornParamType(final Class clazz, final boolean varArg) { - if (clazz == byte.class || clazz == short.class) { - return int.class; - } else if (clazz == float.class) { - // If using variable arity, we'll pass a Double instead of double - // so that floats don't extend the length of the parameter list. - // We return Object.class instead of Double.class though as the - // array collector will anyway operate on Object. - return varArg ? Object.class : double.class; - } else if (!clazz.isPrimitive() || clazz == long.class || clazz == char.class) { - return Object.class; - } - return clazz; - } - - private static Class getNashornReturnType(final Class clazz) { - if (clazz == byte.class || clazz == short.class) { - return int.class; - } else if (clazz == float.class) { - return double.class; - } else if (clazz == void.class || clazz == char.class) { - return Object.class; - } - return clazz; - } - - - private void loadField(final InstructionAdapter mv, final String name, final String desc) { - if(classOverride) { - mv.getstatic(generatedClassName, name, desc); - } else { - mv.visitVarInsn(ALOAD, 0); - mv.getfield(generatedClassName, name, desc); - } - } - - private static void convertReturnValue(final InstructionAdapter mv, final Class origReturnType) { - if (origReturnType == void.class) { - mv.pop(); - } else if (origReturnType == Object.class) { - // Must hide ConsString (and potentially other internal Nashorn types) from callers - EXPORT_RETURN_VALUE.invoke(mv); - } else if (origReturnType == byte.class) { - mv.visitInsn(I2B); - } else if (origReturnType == short.class) { - mv.visitInsn(I2S); - } else if (origReturnType == float.class) { - mv.visitInsn(D2F); - } else if (origReturnType == char.class) { - TO_CHAR_PRIMITIVE.invoke(mv); - } - } - - /** - * Emits instruction for converting a parameter on the top of the stack to - * a type that is understood by Nashorn. - * @param mv the current method visitor - * @param t the type on the top of the stack - * @param varArg if the invocation will be variable arity - */ - private static void convertParam(final InstructionAdapter mv, final Type t, final boolean varArg) { - // We perform conversions of some primitives to accommodate types that - // Nashorn can handle. - switch(t.getSort()) { - case Type.CHAR: - // Chars are boxed, as we don't know if the JS code wants to treat - // them as an effective "unsigned short" or as a single-char string. - CHAR_VALUE_OF.invoke(mv); - break; - case Type.FLOAT: - // Floats are widened to double. - mv.visitInsn(Opcodes.F2D); - if (varArg) { - // We'll be boxing everything anyway for the vararg invocation, - // so we might as well do it proactively here and thus not cause - // a widening in the number of slots, as that could even make - // the array creation invocation go over 255 param slots. - DOUBLE_VALUE_OF.invoke(mv); - } - break; - case Type.LONG: - // Longs are boxed as Nashorn can't represent them precisely as a - // primitive number. - LONG_VALUE_OF.invoke(mv); - break; - case Type.OBJECT: - if(t.equals(OBJECT_TYPE)) { - // Object can carry a ScriptObjectMirror and needs to be unwrapped - // before passing into a Nashorn function. - UNWRAP.invoke(mv); - } - break; - } - } - - private static int getParamListLengthInSlots(final Type[] paramTypes) { - int len = paramTypes.length; - for(final Type t: paramTypes) { - final int sort = t.getSort(); - if (sort == Type.FLOAT || sort == Type.DOUBLE) { - // Floats are widened to double, so they'll take up two slots. - // Longs on the other hand are always boxed, so their width - // becomes 1 and thus they don't contribute an extra slot here. - ++len; - } - } - return len; - } - - /** - * Emit code to restore the previous Nashorn Context when needed. - * @param mv the instruction adapter - * @param globalRestoringRunnableVar index of the local variable holding the reference to the global restoring Runnable - */ - private static void emitFinally(final InstructionAdapter mv, final int globalRestoringRunnableVar) { - mv.visitVarInsn(ALOAD, globalRestoringRunnableVar); - RUN.invoke(mv); - } - - private static boolean isThrowableDeclared(final Class[] exceptions) { - for (final Class exception : exceptions) { - if (exception == Throwable.class) { - return true; - } - } - return false; - } - - private void generateSuperMethods() { - for(final MethodInfo mi: methodInfos) { - if(!Modifier.isAbstract(mi.method.getModifiers())) { - generateSuperMethod(mi); - } - } - } - - 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); - mv.areturn(Type.getType(mi.type.returnType())); - endMethod(mv); - } - - // find the appropriate super type to use for invokespecial on the given interface - private Class findInvokespecialOwnerFor(final Class cl) { - assert Modifier.isInterface(cl.getModifiers()) : cl + " is not an interface"; - - if (cl.isAssignableFrom(superClass)) { - return superClass; - } - - for (final Class iface : interfaces) { - if (cl.isAssignableFrom(iface)) { - return iface; - } - } - - // we better that interface that extends the given interface! - throw new AssertionError("can't find the class/interface that extends " + cl); - } - - private int emitSuperConstructorCall(final InstructionAdapter mv, final String methodDesc) { - return emitSuperCall(mv, null, INIT, methodDesc, true); - } - - private int emitSuperCall(final InstructionAdapter mv, final Class owner, final String name, final String methodDesc) { - return emitSuperCall(mv, owner, name, methodDesc, false); - } - - private int emitSuperCall(final InstructionAdapter mv, final Class owner, final String name, final String methodDesc, final boolean constructor) { - mv.visitVarInsn(ALOAD, 0); - int nextParam = 1; - final Type methodType = Type.getMethodType(methodDesc); - for(final Type t: methodType.getArgumentTypes()) { - mv.load(nextParam, t); - nextParam += t.getSize(); - } - - // default method - non-abstract, interface method - if (!constructor && Modifier.isInterface(owner.getModifiers())) { - // we should call default method on the immediate "super" type - not on (possibly) - // the indirectly inherited interface class! - final Class superType = findInvokespecialOwnerFor(owner); - mv.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(superType), name, methodDesc, - Modifier.isInterface(superType.getModifiers())); - } else { - mv.invokespecial(superClassName, name, methodDesc, false); - } - return nextParam; - } - - private void generateFinalizerMethods() { - generateFinalizerDelegate(); - generateFinalizerOverride(); - } - - private void generateFinalizerDelegate() { - // Generate a delegate that will be invoked from the no-permission trampoline. Note it can be private, as we'll - // refer to it with a MethodHandle constant pool entry in the overridden finalize() method (see - // generateFinalizerOverride()). - final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PRIVATE | ACC_STATIC, - FINALIZER_DELEGATE_NAME, FINALIZER_DELEGATE_METHOD_DESCRIPTOR, null, null)); - - // Simply invoke super.finalize() - mv.visitVarInsn(ALOAD, 0); - mv.checkcast(Type.getType('L' + generatedClassName + ';')); - mv.invokespecial(superClassName, "finalize", VOID_METHOD_DESCRIPTOR, false); - - mv.visitInsn(RETURN); - endMethod(mv); - } - - private void generateFinalizerOverride() { - final InstructionAdapter mv = new InstructionAdapter(cw.visitMethod(ACC_PUBLIC, "finalize", - VOID_METHOD_DESCRIPTOR, null, null)); - // Overridden finalizer will take a MethodHandle to the finalizer delegating method, ... - mv.aconst(new Handle(Opcodes.H_INVOKESTATIC, generatedClassName, FINALIZER_DELEGATE_NAME, - FINALIZER_DELEGATE_METHOD_DESCRIPTOR, false)); - mv.visitVarInsn(ALOAD, 0); - // ...and invoke it through JavaAdapterServices.invokeNoPermissions - INVOKE_NO_PERMISSIONS.invoke(mv); - mv.visitInsn(RETURN); - endMethod(mv); - } - - private static String[] getExceptionNames(final Class[] exceptions) { - final String[] exceptionNames = new String[exceptions.length]; - for (int i = 0; i < exceptions.length; ++i) { - exceptionNames[i] = Type.getInternalName(exceptions[i]); - } - return exceptionNames; - } - - private static int getAccessModifiers(final Method method) { - return ACC_PUBLIC | (method.isVarArgs() ? ACC_VARARGS : 0); - } - - /** - * Gathers methods that can be implemented or overridden from the specified type into this factory's - * {@link #methodInfos} set. It will add all non-final, non-static methods that are either public or protected from - * the type if the type itself is public. If the type is a class, the method will recursively invoke itself for its - * superclass and the interfaces it implements, and add further methods that were not directly declared on the - * class. - * @param type the type defining the methods. - */ - private void gatherMethods(final Class type) throws AdaptationException { - if (Modifier.isPublic(type.getModifiers())) { - final Method[] typeMethods = type.isInterface() ? type.getMethods() : type.getDeclaredMethods(); - - for (final Method typeMethod: typeMethods) { - final String name = typeMethod.getName(); - if(name.startsWith(SUPER_PREFIX)) { - continue; - } - final int m = typeMethod.getModifiers(); - if (Modifier.isStatic(m)) { - continue; - } - if (Modifier.isPublic(m) || Modifier.isProtected(m)) { - // Is it a "finalize()"? - if(name.equals("finalize") && typeMethod.getParameterCount() == 0) { - if(type != Object.class) { - hasExplicitFinalizer = true; - if(Modifier.isFinal(m)) { - // Must be able to override an explicit finalizer - throw new AdaptationException(Outcome.ERROR_FINAL_FINALIZER, type.getCanonicalName()); - } - } - continue; - } - - final MethodInfo mi = new MethodInfo(typeMethod); - if (Modifier.isFinal(m) || isCallerSensitive(typeMethod)) { - finalMethods.add(mi); - } else if (!finalMethods.contains(mi) && methodInfos.add(mi) && Modifier.isAbstract(m)) { - abstractMethodNames.add(mi.getName()); - } - } - } - } - // If the type is a class, visit its superclasses and declared interfaces. If it's an interface, we're done. - // Needing to invoke the method recursively for a non-interface Class object is the consequence of needing to - // see all declared protected methods, and Class.getDeclaredMethods() doesn't provide those declared in a - // superclass. For interfaces, we used Class.getMethods(), as we're only interested in public ones there, and - // getMethods() does provide those declared in a superinterface. - if (!type.isInterface()) { - final Class superType = type.getSuperclass(); - if (superType != null) { - gatherMethods(superType); - } - for (final Class itf: type.getInterfaces()) { - gatherMethods(itf); - } - } - } - - private void gatherMethods(final List> classes) throws AdaptationException { - for(final Class c: classes) { - gatherMethods(c); - } - } - - private static final AccessControlContext GET_DECLARED_MEMBERS_ACC_CTXT = ClassAndLoader.createPermAccCtxt("accessDeclaredMembers"); - - /** - * Creates a collection of methods that are not final, but we still never allow them to be overridden in adapters, - * as explicitly declaring them automatically is a bad idea. Currently, this means {@code Object.finalize()} and - * {@code Object.clone()}. - * @return a collection of method infos representing those methods that we never override in adapter classes. - */ - private static Collection getExcludedMethods() { - return AccessController.doPrivileged(new PrivilegedAction>() { - @Override - public Collection run() { - try { - return Arrays.asList( - new MethodInfo(Object.class, "finalize"), - new MethodInfo(Object.class, "clone")); - } catch (final NoSuchMethodException e) { - throw new AssertionError(e); - } - } - }, GET_DECLARED_MEMBERS_ACC_CTXT); - } - - private String getCommonSuperClass(final String type1, final String type2) { - try { - final Class c1 = Class.forName(type1.replace('/', '.'), false, commonLoader); - final Class c2 = Class.forName(type2.replace('/', '.'), false, commonLoader); - if (c1.isAssignableFrom(c2)) { - return type1; - } - if (c2.isAssignableFrom(c1)) { - return type2; - } - if (c1.isInterface() || c2.isInterface()) { - return OBJECT_TYPE.getInternalName(); - } - return assignableSuperClass(c1, c2).getName().replace('.', '/'); - } catch(final ClassNotFoundException e) { - throw new RuntimeException(e); - } - } - - private static Class assignableSuperClass(final Class c1, final Class c2) { - final Class superClass = c1.getSuperclass(); - return superClass.isAssignableFrom(c2) ? superClass : assignableSuperClass(superClass, c2); - } - - private static boolean isCallerSensitive(final AccessibleObject e) { - return e.isAnnotationPresent(CallerSensitive.class); - } - - private static Call lookupServiceMethod(final String name, final Class rtype, final Class... ptypes) { - return staticCallNoLookup(JavaAdapterServices.class, name, rtype, ptypes); - } -}