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8004937: Improve proxy construction

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Reviewed-by: jrose, ahgross
This commit is contained in:
Mandy Chung 2013-01-24 16:45:38 -08:00
parent 7303280ef5
commit fad9c0e89c
2 changed files with 21 additions and 6 deletions
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2
jdk/src/share/classes/java/lang/invoke/MethodHandleNatives.java
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@ -476,6 +476,8 @@ class MethodHandleNatives {
case "getProxyClass":
case "newProxyInstance":
return defc == java.lang.reflect.Proxy.class;
case "asInterfaceInstance":
return defc == java.lang.invoke.MethodHandleProxies.class;
case "getBundle":
case "clearCache":
return defc == java.util.ResourceBundle.class;

25
jdk/src/share/classes/java/lang/invoke/MethodHandleProxies.java
View File

@ -141,12 +141,15 @@ public class MethodHandleProxies {
<T> T asInterfaceInstance(final Class<T> intfc, final MethodHandle target) {
if (!intfc.isInterface() || !Modifier.isPublic(intfc.getModifiers()))
throw new IllegalArgumentException("not a public interface: "+intfc.getName());
SecurityManager smgr = System.getSecurityManager();
if (smgr != null) {
final MethodHandle mh;
if (System.getSecurityManager() != null) {
final int CALLER_FRAME = 2; // 0: Reflection, 1: asInterfaceInstance, 2: caller
final Class<?> caller = Reflection.getCallerClass(CALLER_FRAME);
final ClassLoader ccl = caller.getClassLoader();
final ClassLoader ccl = caller != null ? caller.getClassLoader() : null;
ReflectUtil.checkProxyPackageAccess(ccl, intfc);
mh = ccl != null ? bindCaller(target, caller) : target;
} else {
mh = target;
}
ClassLoader proxyLoader = intfc.getClassLoader();
if (proxyLoader == null) {
@ -160,7 +163,7 @@ public class MethodHandleProxies {
for (int i = 0; i < methods.length; i++) {
Method sm = methods[i];
MethodType smMT = MethodType.methodType(sm.getReturnType(), sm.getParameterTypes());
MethodHandle checkTarget = target.asType(smMT); // make throw WMT
MethodHandle checkTarget = mh.asType(smMT); // make throw WMT
checkTarget = checkTarget.asType(checkTarget.type().changeReturnType(Object.class));
vaTargets[i] = checkTarget.asSpreader(Object[].class, smMT.parameterCount());
}
@ -183,8 +186,8 @@ public class MethodHandleProxies {
}
};
Object proxy;
if (smgr != null) {
final Object proxy;
if (System.getSecurityManager() != null) {
// sun.invoke.WrapperInstance is a restricted interface not accessible
// by any non-null class loader.
final ClassLoader loader = proxyLoader;
@ -204,6 +207,16 @@ public class MethodHandleProxies {
return intfc.cast(proxy);
}
private static MethodHandle bindCaller(MethodHandle target, Class<?> hostClass) {
MethodHandle cbmh = MethodHandleImpl.bindCaller(target, hostClass);
if (target.isVarargsCollector()) {
MethodType type = cbmh.type();
int arity = type.parameterCount();
return cbmh.asVarargsCollector(type.parameterType(arity-1));
}
return cbmh;
}
/**
* Determines if the given object was produced by a call to {@link #asInterfaceInstance asInterfaceInstance}.
* @param x any reference