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comparison graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotNmethod.java @ 21551:5324104ac4f3

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moved com.oracle.graal.hotspot.jvmci classes to com.oracle.jvmci.hotspot module (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 26 May 2015 17:13:37 +0200
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21550:f48a6cea31eb 21551:5324104ac4f3
1 /*
2 * Copyright (c) 2011, 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 com.oracle.jvmci.hotspot;
24
25 import static com.oracle.jvmci.hotspot.HotSpotJVMCIRuntime.*;
26
27 import com.oracle.graal.api.code.*;
28 import com.oracle.graal.api.meta.*;
29
30 /**
31 * Implementation of {@link InstalledCode} for code installed as an nmethod. The nmethod stores a
32 * weak reference to an instance of this class. This is necessary to keep the nmethod from being
33 * unloaded while the associated {@link HotSpotNmethod} instance is alive.
34 * <p>
35 * Note that there is no (current) way for the reference from an nmethod to a {@link HotSpotNmethod}
36 * instance to be anything but weak. This is due to the fact that HotSpot does not treat nmethods as
37 * strong GC roots.
38 */
39 public class HotSpotNmethod extends HotSpotInstalledCode {
40
41 /**
42 * This (indirect) Method* reference is safe since class redefinition preserves all methods
43 * associated with nmethods in the code cache.
44 */
45 private final HotSpotResolvedJavaMethod method;
46
47 private final boolean isDefault;
48 private final boolean isExternal;
49
50 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault) {
51 this(method, name, isDefault, false);
52 }
53
54 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault, boolean isExternal) {
55 super(name);
56 this.method = method;
57 this.isDefault = isDefault;
58 this.isExternal = isExternal;
59 }
60
61 public boolean isDefault() {
62 return isDefault;
63 }
64
65 public boolean isExternal() {
66 return isExternal;
67 }
68
69 public ResolvedJavaMethod getMethod() {
70 return method;
71 }
72
73 @Override
74 public void invalidate() {
75 runtime().getCompilerToVM().invalidateInstalledCode(this);
76 }
77
78 @Override
79 public String toString() {
80 return String.format("InstalledNmethod[method=%s, codeBlob=0x%x, isDefault=%b, name=%s]", method, getAddress(), isDefault, name);
81 }
82
83 protected boolean checkThreeObjectArgs() {
84 assert method.getSignature().getParameterCount(!method.isStatic()) == 3;
85 assert method.getSignature().getParameterKind(0) == Kind.Object;
86 assert method.getSignature().getParameterKind(1) == Kind.Object;
87 assert !method.isStatic() || method.getSignature().getParameterKind(2) == Kind.Object;
88 return true;
89 }
90
91 private boolean checkArgs(Object... args) {
92 JavaType[] sig = method.toParameterTypes();
93 assert args.length == sig.length : method.format("%H.%n(%p): expected ") + sig.length + " args, got " + args.length;
94 for (int i = 0; i < sig.length; i++) {
95 Object arg = args[i];
96 if (arg == null) {
97 assert sig[i].getKind() == Kind.Object : method.format("%H.%n(%p): expected arg ") + i + " to be Object, not " + sig[i];
98 } else if (sig[i].getKind() != Kind.Object) {
99 assert sig[i].getKind().toBoxedJavaClass() == arg.getClass() : method.format("%H.%n(%p): expected arg ") + i + " to be " + sig[i] + ", not " + arg.getClass();
100 }
101 }
102 return true;
103 }
104
105 @Override
106 public Object executeVarargs(Object... args) throws InvalidInstalledCodeException {
107 assert checkArgs(args);
108 assert !isExternal();
109 return runtime().getCompilerToVM().executeCompiledMethodVarargs(args, this);
110 }
111
112 @Override
113 public long getStart() {
114 return isValid() ? super.getStart() : 0;
115 }
116 }