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 DONT_INLINE_THRESHOLD;
50 static final int PROFILE_LEVEL;
51
52 static {
53 final Object[] values = new Object[7];
54 AccessController.doPrivileged(new PrivilegedAction<Void>() {
55 public Void run() {
56 values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
57 values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
58 values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
59 values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
60 values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", 0);
61 values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", 30);
62 values[6] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
63 return null;
64 }
65 });
66 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
67 DUMP_CLASS_FILES = (Boolean) values[1];
68 TRACE_INTERPRETER = (Boolean) values[2];
69 TRACE_METHOD_LINKAGE = (Boolean) values[3];
70 COMPILE_THRESHOLD = (Integer) values[4];
71 DONT_INLINE_THRESHOLD = (Integer) values[5];
72 PROFILE_LEVEL = (Integer) values[6];
73 }
74
75 /** Tell if any of the debugging switches are turned on.
76 * If this is the case, it is reasonable to perform extra checks or save extra information.
77 */
78 /*non-public*/ static boolean debugEnabled() {
79 return (DEBUG_METHOD_HANDLE_NAMES |
80 DUMP_CLASS_FILES |
81 TRACE_INTERPRETER |
82 TRACE_METHOD_LINKAGE);
83 }
84
85 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
86 if (type == null)
87 type = target.type();
88 MemberName name = null;
89 if (target != null)
90 name = target.internalMemberName();
91 if (name == null)
92 return "invoke" + type;
93 return name.getName() + type;
94 }
95
96 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
97 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
98 }
99
100 /*non-public*/ static String getNameString(MethodHandle target) {
101 return getNameString(target, (MethodType) null);
102 }
103
104 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
105 String str = String.valueOf(obj);
106 if (target == null) return str;
107 int paren = str.indexOf('(');
108 if (paren >= 0) str = str.substring(0, paren);
109 return str + target.type();
110 }
111
112 // handy shared exception makers (they simplify the common case code)
113 /*non-public*/ static InternalError newInternalError(String message) {
114 return new InternalError(message);
115 }
116 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
117 return new InternalError(message, cause);
118 }
119 /*non-public*/ static InternalError newInternalError(Throwable cause) {
120 return new InternalError(cause);
121 }
122 /*non-public*/ static RuntimeException newIllegalStateException(String message) {
123 return new IllegalStateException(message);
124 }
125 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
126 return new IllegalStateException(message(message, obj));
127 }
128 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
129 return new IllegalArgumentException(message);
130 }
131 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
132 return new IllegalArgumentException(message(message, obj));
133 }
134 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
135 return new IllegalArgumentException(message(message, obj, obj2));
136 }
137 /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
138 /*non-public*/ static Error uncaughtException(Throwable ex) {
139 if (ex instanceof Error) throw (Error) ex;
140 if (ex instanceof RuntimeException) throw (RuntimeException) ex;
141 throw newInternalError("uncaught exception", ex);
142 }
143 static Error NYI() {
144 throw new AssertionError("NYI");
145 }
146 private static String message(String message, Object obj) {
147 if (obj != null) message = message + ": " + obj;
148 return message;
149 }
150 private static String message(String message, Object obj, Object obj2) {
151 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
152 return message;
153 }
154 }