1 /* 2 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.hotspot; 24 25 import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM; 26 import jdk.vm.ci.code.InstalledCode; 27 import jdk.vm.ci.code.InvalidInstalledCodeException; 28 import jdk.vm.ci.meta.JavaKind; 29 import jdk.vm.ci.meta.JavaType; 30 import jdk.vm.ci.meta.ResolvedJavaMethod; 31 32 /** 33 * Implementation of {@link InstalledCode} for code installed as an nmethod. 34 * 35 * When a {@link HotSpotNmethod} dies, it triggers unloading of the nmethod unless 36 * {@link #isDefault() == true}. 37 */ 38 public class HotSpotNmethod extends HotSpotInstalledCode { 39 40 /** 41 * This (indirect) Method* reference is safe since class redefinition preserves all methods 42 * associated with nmethods in the code cache. 43 */ 44 private final HotSpotResolvedJavaMethod method; 45 46 private final boolean isDefault; 47 48 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault) { 49 super(name); 50 this.method = method; 51 this.isDefault = isDefault; 52 } 53 54 /** 55 * Determines if the nmethod associated with this object is the compiled entry point for 56 * {@link #getMethod()}. If {@code false}, then the nmethod is unloaded when the VM determines 57 * this object has died. 58 */ 59 public boolean isDefault() { 60 return isDefault; 61 } 62 63 public ResolvedJavaMethod getMethod() { 64 return method; 65 } 66 67 @Override 68 public void invalidate() { 69 compilerToVM().invalidateInstalledCode(this); 70 } 71 72 @Override 73 public String toString() { 74 return String.format("InstalledNmethod[method=%s, codeBlob=0x%x, isDefault=%b, name=%s]", method, getAddress(), isDefault, name); 75 } 76 77 protected boolean checkThreeObjectArgs() { 78 assert method.getSignature().getParameterCount(!method.isStatic()) == 3; 79 assert method.getSignature().getParameterKind(0) == JavaKind.Object; 80 assert method.getSignature().getParameterKind(1) == JavaKind.Object; 81 assert !method.isStatic() || method.getSignature().getParameterKind(2) == JavaKind.Object; 82 return true; 83 } 84 85 private boolean checkArgs(Object... args) { 86 JavaType[] sig = method.toParameterTypes(); 87 assert args.length == sig.length : method.format("%H.%n(%p): expected ") + sig.length + " args, got " + args.length; 88 for (int i = 0; i < sig.length; i++) { 89 Object arg = args[i]; 90 if (arg == null) { 91 assert sig[i].getJavaKind() == JavaKind.Object : method.format("%H.%n(%p): expected arg ") + i + " to be Object, not " + sig[i]; 92 } else if (sig[i].getJavaKind() != JavaKind.Object) { 93 assert sig[i].getJavaKind().toBoxedJavaClass() == arg.getClass() : method.format("%H.%n(%p): expected arg ") + i + " to be " + sig[i] + ", not " + arg.getClass(); 94 } 95 } 96 return true; 97 } 98 99 @Override 100 public Object executeVarargs(Object... args) throws InvalidInstalledCodeException { 101 assert checkArgs(args); 102 return compilerToVM().executeInstalledCode(args, this); 103 } 104 105 @Override 106 public long getStart() { 107 return isValid() ? super.getStart() : 0; 108 } 109 }