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96 lines (89 loc) · 6.85 KB
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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.max.unsafe;
import static com.sun.cri.bytecode.Bytecodes.*;
import java.lang.ref.*;
import java.security.*;
import com.sun.cri.bytecode.*;
import com.sun.max.annotate.*;
import com.sun.max.vm.actor.holder.*;
import com.sun.max.vm.actor.member.*;
import com.sun.max.vm.object.*;
import com.sun.max.vm.reflection.*;
import com.sun.max.vm.stack.*;
import com.sun.max.vm.thread.*;
import com.sun.max.vm.type.*;
/**
* Any method annotated with {@link INTRINSIC}(UNSAFE_CAST) exists solely to provide an escape hatch from Java's type checking. All
* such methods are recognized by the compiler to simply be an unsafe coercion from one type to another.
*
* Any method annotated with this annotation must take exactly one parameter (which will be the receiver if the method
* is non-static ), have a non-void, non-generic return type. The type of the parameter is the type being
* converted from and the return type is the type being converted to.
*
* The compiler must translate calls to these methods to simply replace the use of the result with the single parameter.
*
* A method annotated with the {@code INTRINSIC(UNSAFE_CAST)} may have an implementation (i.e. it is not {@code native} and not
* {@code abstract}). This implementation is used to fold (i.e. compile-time evaluate) the method. The implementation
* will simply be an explicit cast statement that results in a runtime type check when the method is
* evaluated.
*
* @author Bernd Mathiske
* @author Doug Simon
*/
public final class UnsafeCast {
@HOSTED_ONLY
private UnsafeCast() {
}
@INTRINSIC(UNSAFE_CAST) public static VmThread asVmThread(Object object) { return (VmThread) object; }
@INTRINSIC(UNSAFE_CAST) public static Object[] asObjectArray(Object object) { return (Object[]) object; }
@INTRINSIC(UNSAFE_CAST) public static Hybrid asHybrid(Object object) { return (Hybrid) object; }
@INTRINSIC(UNSAFE_CAST) public static StackUnwindingContext asStackUnwindingContext(Object object) { return (StackUnwindingContext) object; }
@INTRINSIC(UNSAFE_CAST) public static Class asClass(Object object) { return (Class) object; }
@INTRINSIC(UNSAFE_CAST) public static ClassRegistry asClassRegistry(Object object) { return (ClassRegistry) object; }
@INTRINSIC(UNSAFE_CAST) public static MethodInvocationStub asMethodInvocationStub(Object object) { return (MethodInvocationStub) object; }
@INTRINSIC(UNSAFE_CAST) public static ConstructorInvocationStub asConstructorInvocationStub(Object object) { return (ConstructorInvocationStub) object; }
@INTRINSIC(UNSAFE_CAST) public static Throwable asThrowable(Object object) { return (Throwable) object; }
@INTRINSIC(UNSAFE_CAST) public static int[] asIntArray(Object object) { return (int[]) object; }
@INTRINSIC(UNSAFE_CAST) public static DynamicHub asDynamicHub(Object object) { return (DynamicHub) object; }
@INTRINSIC(UNSAFE_CAST) public static Hub asHub(Object object) { return (Hub) object; }
@INTRINSIC(UNSAFE_CAST) public static ArrayClassActor asArrayClassActor(Object object) { return (ArrayClassActor) object; }
@INTRINSIC(UNSAFE_CAST) public static ClassActor asClassActor(Object object) { return (ClassActor) object; }
@INTRINSIC(UNSAFE_CAST) public static FieldActor asFieldActor(Object object) { return (FieldActor) object; }
@INTRINSIC(UNSAFE_CAST) public static MethodActor asClassMethodActor(Object object) { return (ClassMethodActor) object; }
@INTRINSIC(UNSAFE_CAST) public static StaticMethodActor asStaticMethodActor(Object object) { return (StaticMethodActor) object; }
@INTRINSIC(UNSAFE_CAST) public static VirtualMethodActor asVirtualMethodActor(Object object) { return (VirtualMethodActor) object; }
@INTRINSIC(UNSAFE_CAST) public static AccessControlContext asAccessControlContext(Object object) { return (AccessControlContext) object; }
@INTRINSIC(UNSAFE_CAST) public static Reference asJDKReference(Object object) { return (Reference) object; }
@INTRINSIC(UNSAFE_CAST) public static InterfaceActor asInterfaceActor(Object object) { return (InterfaceActor) object; }
@INTRINSIC(UNSAFE_CAST) public static InterfaceMethodActor asInterfaceMethodActor(Object object) { return (InterfaceMethodActor) object; }
@INTRINSIC(UNSAFE_CAST) public static Address asAddress(int value) { return Address.fromUnsignedInt(value); }
@INTRINSIC(UNSAFE_CAST) public static Address asAddress(long value) { return Address.fromLong(value); }
@INTRINSIC(UNSAFE_CAST) public static Offset asOffset(int value) { return Offset.fromUnsignedInt(value); }
@INTRINSIC(UNSAFE_CAST) public static Offset asOffset(long value) { return Offset.fromLong(value); }
@INTRINSIC(UNSAFE_CAST) public static int asInt(Word word) { return word.asAddress().toInt(); }
@INTRINSIC(UNSAFE_CAST) public static long asLong(Word word) { return word.asAddress().toLong(); }
@INTRINSIC(UNSAFE_CAST) public static boolean asBoolean(byte value) { return value != 0; }
@INTRINSIC(UNSAFE_CAST) public static byte asByte(boolean value) { return value ? 1 : (byte) 0; }
@INTRINSIC(UNSAFE_CAST) public static int asInt(boolean value) { return value ? 1 : 0; }
@INTRINSIC(UNSAFE_CAST) public static char asChar(short value) { return (char) value; }
@INTRINSIC(UNSAFE_CAST) public static short asShort(char value) { return (short) value; }
}