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DirectMethodHandleAccessor.java
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DirectMethodHandleAccessor.java
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/*
* Copyright (c) 2021, 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.internal.reflect;
import jdk.internal.access.JavaLangInvokeAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.misc.VM;
import jdk.internal.vm.annotation.ForceInline;
import jdk.internal.vm.annotation.Hidden;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.WrongMethodTypeException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import static java.lang.invoke.MethodType.genericMethodType;
import static jdk.internal.reflect.MethodHandleAccessorFactory.SPECIALIZED_PARAM_COUNT;
import static jdk.internal.reflect.MethodHandleAccessorFactory.LazyStaticHolder.JLIA;
class DirectMethodHandleAccessor extends MethodAccessorImpl {
/**
* Creates a MethodAccessorImpl for a non-native method.
*/
static MethodAccessorImpl methodAccessor(Method method, MethodHandle target) {
assert !Modifier.isNative(method.getModifiers());
return new DirectMethodHandleAccessor(method, target, false);
}
/**
* Creates MethodAccessorImpl for the adapter method for a caller-sensitive method.
* The given target method handle is the adapter method with the additional caller class
* parameter.
*/
static MethodAccessorImpl callerSensitiveAdapter(Method original, MethodHandle target) {
assert Reflection.isCallerSensitive(original);
// for CSM adapter method with the additional caller class parameter
// creates the adaptive method accessor only.
return new DirectMethodHandleAccessor(original, target, true);
}
/**
* Creates MethodAccessorImpl that invokes the given method via VM native reflection
* support. This is used for native methods. It can be used for java methods
* during early VM startup.
*/
static MethodAccessorImpl nativeAccessor(Method method, boolean callerSensitive) {
return callerSensitive ? new NativeAccessor(method, findCSMethodAdapter(method))
: new NativeAccessor(method);
}
private static final int PARAM_COUNT_MASK = 0x00FF;
private static final int HAS_CALLER_PARAM_BIT = 0x0100;
private static final int IS_STATIC_BIT = 0x0200;
private static final int NONZERO_BIT = 0x8000_0000;
private final Class<?> declaringClass;
private final int paramCount;
private final int flags;
private final MethodHandle target;
DirectMethodHandleAccessor(Method method, MethodHandle target, boolean hasCallerParameter) {
this.declaringClass = method.getDeclaringClass();
this.paramCount = method.getParameterCount();
this.flags = (hasCallerParameter ? HAS_CALLER_PARAM_BIT : 0) |
(Modifier.isStatic(method.getModifiers()) ? IS_STATIC_BIT : 0);
this.target = target;
}
@Override
@ForceInline
public Object invoke(Object obj, Object[] args) throws InvocationTargetException {
if (!isStatic()) {
checkReceiver(obj);
}
checkArgumentCount(paramCount, args);
try {
return invokeImpl(obj, args);
} catch (ClassCastException | WrongMethodTypeException e) {
if (isIllegalArgument(e)) {
// No cause in IAE to be consistent with the old behavior
throw new IllegalArgumentException("argument type mismatch");
} else {
throw new InvocationTargetException(e);
}
} catch (NullPointerException e) {
if (isIllegalArgument(e)) {
throw new IllegalArgumentException(e);
} else {
throw new InvocationTargetException(e);
}
} catch (Throwable e) {
throw new InvocationTargetException(e);
}
}
@Override
@ForceInline
public Object invoke(Object obj, Object[] args, Class<?> caller) throws InvocationTargetException {
if (!isStatic()) {
checkReceiver(obj);
}
checkArgumentCount(paramCount, args);
try {
return invokeImpl(obj, args, caller);
} catch (ClassCastException | WrongMethodTypeException e) {
if (isIllegalArgument(e)) {
// No cause in IAE to be consistent with the old behavior
throw new IllegalArgumentException("argument type mismatch");
} else {
throw new InvocationTargetException(e);
}
} catch (NullPointerException e) {
if (isIllegalArgument(e)) {
throw new IllegalArgumentException(e);
} else {
throw new InvocationTargetException(e);
}
} catch (Throwable e) {
throw new InvocationTargetException(e);
}
}
@Hidden
@ForceInline
private Object invokeImpl(Object obj, Object[] args) throws Throwable {
return switch (paramCount) {
case 0 -> target.invokeExact(obj);
case 1 -> target.invokeExact(obj, args[0]);
case 2 -> target.invokeExact(obj, args[0], args[1]);
case 3 -> target.invokeExact(obj, args[0], args[1], args[2]);
default -> target.invokeExact(obj, args);
};
}
@Hidden
@ForceInline
private Object invokeImpl(Object obj, Object[] args, Class<?> caller) throws Throwable {
if (hasCallerParameter()) {
// caller-sensitive method is invoked through method with caller parameter
return switch (paramCount) {
case 0 -> target.invokeExact(obj, caller);
case 1 -> target.invokeExact(obj, args[0], caller);
case 2 -> target.invokeExact(obj, args[0], args[1], caller);
case 3 -> target.invokeExact(obj, args[0], args[1], args[2], caller);
default -> target.invokeExact(obj, args, caller);
};
} else {
// caller-sensitive method is invoked through a per-caller invoker while
// the target MH is always spreading the args
var invoker = JLIA.reflectiveInvoker(caller);
try {
// invoke the target method handle via an invoker
return invoker.invokeExact(target, obj, args);
} catch (IllegalArgumentException e) {
throw new InvocationTargetException(e);
}
}
}
private boolean isStatic() {
return (flags & IS_STATIC_BIT) == IS_STATIC_BIT;
}
private boolean hasCallerParameter() {
return (flags & HAS_CALLER_PARAM_BIT) == HAS_CALLER_PARAM_BIT;
}
private boolean isIllegalArgument(RuntimeException ex) {
return AccessorUtils.isIllegalArgument(DirectMethodHandleAccessor.class, ex);
}
private void checkReceiver(Object o) {
// NOTE: will throw NullPointerException, as specified, if o is null
if (!declaringClass.isAssignableFrom(o.getClass())) {
throw new IllegalArgumentException("object is not an instance of declaring class");
}
}
/**
* Invoke the method via native VM reflection
*/
static class NativeAccessor extends MethodAccessorImpl {
private final Method method;
private final Method csmAdapter;
private final boolean callerSensitive;
NativeAccessor(Method method) {
assert !Reflection.isCallerSensitive(method);
this.method = method;
this.csmAdapter = null;
this.callerSensitive = false;
}
NativeAccessor(Method method, Method csmAdapter) {
assert Reflection.isCallerSensitive(method);
this.method = method;
this.csmAdapter = csmAdapter;
this.callerSensitive = true;
}
@Override
public Object invoke(Object obj, Object[] args) throws InvocationTargetException {
assert csmAdapter == null;
return invoke0(method, obj, args);
}
@Override
public Object invoke(Object obj, Object[] args, Class<?> caller) throws InvocationTargetException {
assert callerSensitive;
if (csmAdapter != null) {
Object[] newArgs = new Object[csmAdapter.getParameterCount()];
newArgs[0] = caller;
if (args != null) {
System.arraycopy(args, 0, newArgs, 1, args.length);
}
return invoke0(csmAdapter, obj, newArgs);
} else {
assert VM.isJavaLangInvokeInited();
try {
return ReflectiveInvoker.invoke(methodAccessorInvoker(), caller, obj, args);
} catch (InvocationTargetException|RuntimeException|Error e) {
throw e;
} catch (Throwable e) {
throw new InternalError(e);
}
}
}
public Object invokeViaReflectiveInvoker(Object obj, Object[] args) throws InvocationTargetException {
return invoke0(method, obj, args);
}
/*
* A method handle to invoke Reflective::Invoker
*/
private MethodHandle maInvoker;
private MethodHandle methodAccessorInvoker() {
MethodHandle invoker = maInvoker;
if (invoker == null) {
maInvoker = invoker = ReflectiveInvoker.bindTo(this);
}
return invoker;
}
private static native Object invoke0(Method m, Object obj, Object[] args);
static class ReflectiveInvoker {
/**
* Return a method handle for NativeAccessor::invoke bound to the given accessor object
*/
static MethodHandle bindTo(NativeAccessor accessor) {
return NATIVE_ACCESSOR_INVOKE.bindTo(accessor);
}
/*
* When Method::invoke on a caller-sensitive method is to be invoked
* and no adapter method with an additional caller class argument is defined,
* the caller-sensitive method must be invoked via an invoker injected
* which has the following signature:
* reflect_invoke_V(MethodHandle mh, Object target, Object[] args)
*
* The stack frames calling the method `csm` through reflection will
* look like this:
* obj.csm(args)
* NativeAccessor::invoke(obj, args)
* InjectedInvoker::reflect_invoke_V(vamh, obj, args);
* method::invoke(obj, args)
* p.Foo::m
*
* An injected invoker class is a hidden class which has the same
* defining class loader, runtime package, and protection domain
* as the given caller class.
*
* The caller-sensitive method will call Reflection::getCallerClass
* to get the caller class.
*/
static Object invoke(MethodHandle target, Class<?> caller, Object obj, Object[] args)
throws InvocationTargetException
{
var reflectInvoker = JLIA.reflectiveInvoker(caller);
try {
return reflectInvoker.invokeExact(target, obj, args);
} catch (InvocationTargetException | RuntimeException | Error e) {
throw e;
} catch (Throwable e) {
throw new InternalError(e);
}
}
static final JavaLangInvokeAccess JLIA;
static final MethodHandle NATIVE_ACCESSOR_INVOKE;
static {
try {
JLIA = SharedSecrets.getJavaLangInvokeAccess();
NATIVE_ACCESSOR_INVOKE = MethodHandles.lookup().findVirtual(NativeAccessor.class, "invoke",
genericMethodType(1, true));
} catch (NoSuchMethodException|IllegalAccessException e) {
throw new InternalError(e);
}
}
}
}
private static void checkArgumentCount(int paramCount, Object[] args) {
// only check argument count for specialized forms
if (paramCount > SPECIALIZED_PARAM_COUNT) return;
int argc = args != null ? args.length : 0;
if (argc != paramCount) {
throw new IllegalArgumentException("wrong number of arguments: " + argc + " expected: " + paramCount);
}
}
/**
* Returns an adapter for caller-sensitive method if present.
* Otherwise, null.
*
* A trusted method can define an adapter method for a caller-sensitive method `foo`
* with an additional caller class argument that will be invoked reflectively.
*/
private static Method findCSMethodAdapter(Method method) {
if (!Reflection.isCallerSensitive(method)) return null;
int paramCount = method.getParameterCount();
Class<?>[] ptypes = new Class<?>[paramCount+1];
ptypes[paramCount] = Class.class;
System.arraycopy(method.getParameterTypes(), 0, ptypes, 0, paramCount);
try {
return method.getDeclaringClass().getDeclaredMethod(method.getName(), ptypes);
} catch (NoSuchMethodException ex) {
return null;
}
}
}