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 int 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", 30);
60 values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
61 return null;
62 }
63 });
64 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
65 DUMP_CLASS_FILES = (Boolean) values[1];
66 TRACE_INTERPRETER = (Boolean) values[2];
67 TRACE_METHOD_LINKAGE = (Boolean) values[3];
68 COMPILE_THRESHOLD = (Integer) values[4];
69 PROFILE_LEVEL = (Integer) values[5];
70 }
71
72 /** Tell if any of the debugging switches are turned on.
73 * If this is the case, it is reasonable to perform extra checks or save extra information.
74 */
75 /*non-public*/ static boolean debugEnabled() {
76 return (DEBUG_METHOD_HANDLE_NAMES |
77 DUMP_CLASS_FILES |
78 TRACE_INTERPRETER |
79 TRACE_METHOD_LINKAGE);
80 }
81
82 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
83 if (type == null)
84 type = target.type();
85 MemberName name = null;
86 if (target != null)
87 name = target.internalMemberName();
88 if (name == null)
89 return "invoke" + type;
90 return name.getName() + type;
91 }
92
93 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
94 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
95 }
96
97 /*non-public*/ static String getNameString(MethodHandle target) {
98 return getNameString(target, (MethodType) null);
99 }
100
101 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
102 String str = String.valueOf(obj);
103 if (target == null) return str;
104 int paren = str.indexOf('(');
105 if (paren >= 0) str = str.substring(0, paren);
106 return str + target.type();
107 }
108
109 // handy shared exception makers (they simplify the common case code)
110 /*non-public*/ static InternalError newInternalError(String message) {
111 return new InternalError(message);
112 }
113 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
114 return new InternalError(message, cause);
115 }
116 /*non-public*/ static InternalError newInternalError(Throwable cause) {
117 return new InternalError(cause);
118 }
119 /*non-public*/ static RuntimeException newIllegalStateException(String message) {
120 return new IllegalStateException(message);
121 }
122 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
123 return new IllegalStateException(message(message, obj));
124 }
125 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
126 return new IllegalArgumentException(message);
127 }
128 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
129 return new IllegalArgumentException(message(message, obj));
130 }
131 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
132 return new IllegalArgumentException(message(message, obj, obj2));
133 }
134 /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
135 /*non-public*/ static Error uncaughtException(Throwable ex) {
136 if (ex instanceof Error) throw (Error) ex;
137 if (ex instanceof RuntimeException) throw (RuntimeException) ex;
138 throw newInternalError("uncaught exception", ex);
139 }
140 static Error NYI() {
141 throw new AssertionError("NYI");
142 }
143 private static String message(String message, Object obj) {
144 if (obj != null) message = message + ": " + obj;
145 return message;
146 }
147 private static String message(String message, Object obj, Object obj2) {
148 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
149 return message;
150 }
151 }