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8169069: Module system implementation refresh (11/2016)

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Co-authored-by: Mandy Chung <mandy.chung@oracle.com>
Co-authored-by: Claes Redestad <claes.redestad@oracle.com>
Co-authored-by: Mark Reinhold <mark.reinhold@oracle.com>
Reviewed-by: plevart, chegar, psandoz, mchung, alanb, dfuchs, naoto, coffeys, weijun
This commit is contained in:
Alan Bateman 2016-12-01 08:57:53 +00:00
parent 2e931825c6
commit fbe85300bf
510 changed files with 16787 additions and 5365 deletions
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61
jdk/src/java.base/share/classes/java/lang/invoke/MethodHandles.java
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@ -42,6 +42,7 @@ import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Module;
import java.lang.reflect.ReflectPermission;
import java.nio.ByteOrder;
import java.util.ArrayList;
@ -141,6 +142,59 @@ public class MethodHandles {
}
}
/**
* Returns a {@link Lookup lookup object} with full capabilities to emulate all
* supported bytecode behaviors, including <a href="MethodHandles.Lookup.html#privacc">
* private access</a>, on a target class.
* This method checks that a caller, specified as a {@code Lookup} object, is allowed to
* do <em>deep reflection</em> on the target class. If {@code m1} is the module containing
* the {@link Lookup#lookupClass() lookup class}, and {@code m2} is the module containing
* the target class, then this check ensures that
* <ul>
* <li>{@code m1} {@link Module#canRead reads} {@code m2}.</li>
* <li>{@code m2} {@link Module#isOpen(String,Module) opens} the package containing
* the target class to at least {@code m1}.</li>
* <li>The lookup has the {@link Lookup#MODULE MODULE} lookup mode.</li>
* </ul>
* <p>
* If there is a security manager, its {@code checkPermission} method is called to
* check {@code ReflectPermission("suppressAccessChecks")}.
* @apiNote The {@code MODULE} lookup mode serves to authenticate that the lookup object
* was created by code in the caller module (or derived from a lookup object originally
* created by the caller). A lookup object with the {@code MODULE} lookup mode can be
* shared with trusted parties without giving away {@code PRIVATE} and {@code PACKAGE}
* access to the caller.
* @param targetClass the target class
* @param lookup the caller lookup object
* @return a lookup object for the target class, with private access
* @throws IllegalArgumentException if {@code targetClass} is a primitve type or array class
* @throws NullPointerException if {@code targetClass} or {@code caller} is {@code null}
* @throws IllegalAccessException if the access check specified above fails
* @throws SecurityException if denied by the security manager
* @since 9
*/
public static Lookup privateLookupIn(Class<?> targetClass, Lookup lookup) throws IllegalAccessException {
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(ACCESS_PERMISSION);
if (targetClass.isPrimitive())
throw new IllegalArgumentException(targetClass + " is a primitive class");
if (targetClass.isArray())
throw new IllegalArgumentException(targetClass + " is an array class");
Module targetModule = targetClass.getModule();
Module callerModule = lookup.lookupClass().getModule();
if (callerModule != targetModule && targetModule.isNamed()) {
if (!callerModule.canRead(targetModule))
throw new IllegalAccessException(callerModule + " does not read " + targetModule);
String pn = targetClass.getPackageName();
assert pn != null && pn.length() > 0 : "unnamed package cannot be in named module";
if (!targetModule.isOpen(pn, callerModule))
throw new IllegalAccessException(targetModule + " does not open " + pn + " to " + callerModule);
}
if ((lookup.lookupModes() & Lookup.MODULE) == 0)
throw new IllegalAccessException("lookup does not have MODULE lookup mode");
return new Lookup(targetClass);
}
/**
* Performs an unchecked "crack" of a
* <a href="MethodHandleInfo.html#directmh">direct method handle</a>.
@ -1807,7 +1861,12 @@ return mh1;
return callerClass;
}
private boolean hasPrivateAccess() {
/**
* Returns {@code true} if this lookup has {@code PRIVATE} access.
* @return {@code true} if this lookup has {@code PRIVATE} acesss.
* @since 9
*/
public boolean hasPrivateAccess() {
return (allowedModes & PRIVATE) != 0;
}