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. 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 static final boolean PROFILE_GWT;
52 static final int CUSTOMIZE_THRESHOLD;
53
54 // This is a temporary property added for improved error reporting; it will
55 // be removed once it has served its purpose.
56 static final boolean OBSERVE_BMH_SPECIES_CREATION;
57
58 static {
59 final Object[] values = new Object[10];
60 AccessController.doPrivileged(new PrivilegedAction<>() {
61 public Void run() {
62 values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
63 values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
64 values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
65 values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
66 values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", 0);
67 values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", 30);
68 values[6] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
69 values[7] = Boolean.parseBoolean(System.getProperty("java.lang.invoke.MethodHandle.PROFILE_GWT", "true"));
70 values[8] = Integer.getInteger("java.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD", 127);
71 values[9] = Boolean.getBoolean("java.lang.invoke.MethodHandle.OBSERVE_BMH_SPECIES_CREATION");
72 return null;
73 }
74 });
75 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
76 DUMP_CLASS_FILES = (Boolean) values[1];
77 TRACE_INTERPRETER = (Boolean) values[2];
78 TRACE_METHOD_LINKAGE = (Boolean) values[3];
79 COMPILE_THRESHOLD = (Integer) values[4];
80 DONT_INLINE_THRESHOLD = (Integer) values[5];
81 PROFILE_LEVEL = (Integer) values[6];
82 PROFILE_GWT = (Boolean) values[7];
83 CUSTOMIZE_THRESHOLD = (Integer) values[8];
84
85 OBSERVE_BMH_SPECIES_CREATION = (Boolean) values[9];
86
87 if (CUSTOMIZE_THRESHOLD < -1 || CUSTOMIZE_THRESHOLD > 127) {
88 throw newInternalError("CUSTOMIZE_THRESHOLD should be in [-1...127] range");
89 }
90 }
91
92 /** Tell if any of the debugging switches are turned on.
93 * If this is the case, it is reasonable to perform extra checks or save extra information.
94 */
95 /*non-public*/ static boolean debugEnabled() {
96 return (DEBUG_METHOD_HANDLE_NAMES |
97 DUMP_CLASS_FILES |
98 TRACE_INTERPRETER |
99 TRACE_METHOD_LINKAGE);
100 }
101
102 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
103 if (type == null)
104 type = target.type();
105 MemberName name = null;
106 if (target != null)
107 name = target.internalMemberName();
108 if (name == null)
109 return "invoke" + type;
110 return name.getName() + type;
111 }
112
113 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
114 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
115 }
116
117 /*non-public*/ static String getNameString(MethodHandle target) {
118 return getNameString(target, (MethodType) null);
119 }
120
121 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
122 String str = String.valueOf(obj);
123 if (target == null) return str;
124 int paren = str.indexOf('(');
125 if (paren >= 0) str = str.substring(0, paren);
126 return str + target.type();
127 }
128
129 // handy shared exception makers (they simplify the common case code)
130 /*non-public*/ static InternalError newInternalError(String message) {
131 return new InternalError(message);
132 }
133 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
134 return new InternalError(message, cause);
135 }
136 /*non-public*/ static InternalError newInternalError(Throwable cause) {
137 return new InternalError(cause);
138 }
139 /*non-public*/ static RuntimeException newIllegalStateException(String message) {
140 return new IllegalStateException(message);
141 }
142 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
143 return new IllegalStateException(message(message, obj));
144 }
145 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
146 return new IllegalArgumentException(message);
147 }
148 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
149 return new IllegalArgumentException(message(message, obj));
150 }
151 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
152 return new IllegalArgumentException(message(message, obj, obj2));
153 }
154 /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
155 /*non-public*/ static Error uncaughtException(Throwable ex) {
156 if (ex instanceof Error) throw (Error) ex;
157 if (ex instanceof RuntimeException) throw (RuntimeException) ex;
158 throw newInternalError("uncaught exception", ex);
159 }
160 static Error NYI() {
161 throw new AssertionError("NYI");
162 }
163 private static String message(String message, Object obj) {
164 if (obj != null) message = message + ": " + obj;
165 return message;
166 }
167 private static String message(String message, Object obj, Object obj2) {
168 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
169 return message;
170 }
171 }