| /* |
| * Copyright (c) 2011, 2015, 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. |
| * |
| * 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.vm.ci.hotspot; |
| |
| import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM; |
| import jdk.vm.ci.code.InstalledCode; |
| import jdk.vm.ci.code.InvalidInstalledCodeException; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.JavaType; |
| import jdk.vm.ci.meta.ResolvedJavaMethod; |
| |
| /** |
| * Implementation of {@link InstalledCode} for code installed as an nmethod. The nmethod stores a |
| * weak reference to an instance of this class. This is necessary to keep the nmethod from being |
| * unloaded while the associated {@link HotSpotNmethod} instance is alive. |
| * <p> |
| * Note that there is no (current) way for the reference from an nmethod to a {@link HotSpotNmethod} |
| * instance to be anything but weak. This is due to the fact that HotSpot does not treat nmethods as |
| * strong GC roots. |
| */ |
| public class HotSpotNmethod extends HotSpotInstalledCode { |
| |
| /** |
| * This (indirect) Method* reference is safe since class redefinition preserves all methods |
| * associated with nmethods in the code cache. |
| */ |
| private final HotSpotResolvedJavaMethod method; |
| |
| private final boolean isDefault; |
| |
| public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault) { |
| super(name); |
| this.method = method; |
| this.isDefault = isDefault; |
| } |
| |
| public boolean isDefault() { |
| return isDefault; |
| } |
| |
| public ResolvedJavaMethod getMethod() { |
| return method; |
| } |
| |
| @Override |
| public void invalidate() { |
| compilerToVM().invalidateInstalledCode(this); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("InstalledNmethod[method=%s, codeBlob=0x%x, isDefault=%b, name=%s]", method, getAddress(), isDefault, name); |
| } |
| |
| protected boolean checkThreeObjectArgs() { |
| assert method.getSignature().getParameterCount(!method.isStatic()) == 3; |
| assert method.getSignature().getParameterKind(0) == JavaKind.Object; |
| assert method.getSignature().getParameterKind(1) == JavaKind.Object; |
| assert !method.isStatic() || method.getSignature().getParameterKind(2) == JavaKind.Object; |
| return true; |
| } |
| |
| private boolean checkArgs(Object... args) { |
| JavaType[] sig = method.toParameterTypes(); |
| assert args.length == sig.length : method.format("%H.%n(%p): expected ") + sig.length + " args, got " + args.length; |
| for (int i = 0; i < sig.length; i++) { |
| Object arg = args[i]; |
| if (arg == null) { |
| assert sig[i].getJavaKind() == JavaKind.Object : method.format("%H.%n(%p): expected arg ") + i + " to be Object, not " + sig[i]; |
| } else if (sig[i].getJavaKind() != JavaKind.Object) { |
| assert sig[i].getJavaKind().toBoxedJavaClass() == arg.getClass() : method.format("%H.%n(%p): expected arg ") + i + " to be " + sig[i] + ", not " + arg.getClass(); |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public Object executeVarargs(Object... args) throws InvalidInstalledCodeException { |
| assert checkArgs(args); |
| return compilerToVM().executeInstalledCode(args, this); |
| } |
| |
| @Override |
| public long getStart() { |
| return isValid() ? super.getStart() : 0; |
| } |
| } |