1 /*
2 * Copyright (c) 2011, 2012, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.lang.invoke;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import sun.misc.Unsafe;
31
32 /**
33 * This class consists exclusively of static names internal to the
34 * method handle implementation.
35 * Usage: {@code import static java.lang.invoke.MethodHandleStatics.*}
36 * @author John Rose, JSR 292 EG
37 */
38 /*non-public*/ class MethodHandleStatics {
39
40 private MethodHandleStatics() { } // do not instantiate
41
42 static final Unsafe UNSAFE = Unsafe.getUnsafe();
43
44 static final boolean DEBUG_METHOD_HANDLE_NAMES;
45 static final boolean DUMP_CLASS_FILES;
46 static final boolean TRACE_INTERPRETER;
47 static final boolean TRACE_METHOD_LINKAGE;
48 static final Integer COMPILE_THRESHOLD;
49 static final int PROFILE_LEVEL;
50
51 static {
52 final Object[] values = { false, false, false, false, null, null };
53 AccessController.doPrivileged(new PrivilegedAction<Void>() {
54 public Void run() {
55 values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
56 values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
57 values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
58 values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
59 values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD");
60 values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
61
62 return null;
63 }
64 });
65 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
66 DUMP_CLASS_FILES = (Boolean) values[1];
67 TRACE_INTERPRETER = (Boolean) values[2];
68 TRACE_METHOD_LINKAGE = (Boolean) values[3];
69 COMPILE_THRESHOLD = (Integer) values[4];
70 PROFILE_LEVEL = (Integer) values[5];
71 }
72
73 /** Tell if any of the debugging switches are turned on.
74 * If this is the case, it is reasonable to perform extra checks or save extra information.
75 */
76 /*non-public*/ static boolean debugEnabled() {
77 return (DEBUG_METHOD_HANDLE_NAMES |
78 DUMP_CLASS_FILES |
79 TRACE_INTERPRETER |
80 TRACE_METHOD_LINKAGE);
81 }
82
83 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
84 if (type == null)
85 type = target.type();
86 MemberName name = null;
87 if (target != null)
88 name = target.internalMemberName();
89 if (name == null)
90 return "invoke" + type;
91 return name.getName() + type;
92 }
93
94 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
95 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
96 }
97
98 /*non-public*/ static String getNameString(MethodHandle target) {
99 return getNameString(target, (MethodType) null);
100 }
101
102 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
103 String str = String.valueOf(obj);
104 if (target == null) return str;
105 int paren = str.indexOf('(');
106 if (paren >= 0) str = str.substring(0, paren);
107 return str + target.type();
108 }
109
110 // handy shared exception makers (they simplify the common case code)
111 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
112 return new InternalError(message, cause);
113 }
114 /*non-public*/ static InternalError newInternalError(Throwable cause) {
115 return new InternalError(cause);
116 }
117 /*non-public*/ static RuntimeException newIllegalStateException(String message) {
118 return new IllegalStateException(message);
119 }
120 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
121 return new IllegalStateException(message(message, obj));
122 }
123 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
124 return new IllegalArgumentException(message);
125 }
126 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
127 return new IllegalArgumentException(message(message, obj));
128 }
129 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
130 return new IllegalArgumentException(message(message, obj, obj2));
131 }
132 /*non-public*/ static Error uncaughtException(Throwable ex) {
133 throw newInternalError("uncaught exception", ex);
134 }
135 static Error NYI() {
136 throw new AssertionError("NYI");
137 }
138 private static String message(String message, Object obj) {
139 if (obj != null) message = message + ": " + obj;
140 return message;
141 }
142 private static String message(String message, Object obj, Object obj2) {
143 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
144 return message;
145 }
146 }