1 /*
2 * Copyright (c) 2011, 2016, 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 jdk.internal.misc.Unsafe;
29 import sun.security.action.GetPropertyAction;
30
31 import java.util.Properties;
32
33 /**
34 * This class consists exclusively of static names internal to the
35 * method handle implementation.
36 * Usage: {@code import static java.lang.invoke.MethodHandleStatics.*}
37 * @author John Rose, JSR 292 EG
38 */
39 /*non-public*/
40 class MethodHandleStatics {
41
42 private MethodHandleStatics() { } // do not instantiate
43
44 static final Unsafe UNSAFE = Unsafe.getUnsafe();
45
46 static final boolean DEBUG_METHOD_HANDLE_NAMES;
47 static final boolean DUMP_CLASS_FILES;
48 static final boolean TRACE_INTERPRETER;
49 static final boolean TRACE_METHOD_LINKAGE;
50 static final boolean TRACE_RESOLVE;
51 static final int COMPILE_THRESHOLD;
52 static final boolean LOG_LF_COMPILATION_FAILURE;
53 static final int DONT_INLINE_THRESHOLD;
54 static final int PROFILE_LEVEL;
55 static final boolean PROFILE_GWT;
56 static final int CUSTOMIZE_THRESHOLD;
57 static final boolean VAR_HANDLE_GUARDS;
58 static final int MAX_ARITY;
59 static final boolean VAR_HANDLE_IDENTITY_ADAPT;
60
61 static {
62 Properties props = GetPropertyAction.privilegedGetProperties();
63 DEBUG_METHOD_HANDLE_NAMES = Boolean.parseBoolean(
64 props.getProperty("java.lang.invoke.MethodHandle.DEBUG_NAMES"));
65 DUMP_CLASS_FILES = Boolean.parseBoolean(
66 props.getProperty("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES"));
67 TRACE_INTERPRETER = Boolean.parseBoolean(
68 props.getProperty("java.lang.invoke.MethodHandle.TRACE_INTERPRETER"));
69 TRACE_METHOD_LINKAGE = Boolean.parseBoolean(
70 props.getProperty("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE"));
71 TRACE_RESOLVE = Boolean.parseBoolean(
72 props.getProperty("java.lang.invoke.MethodHandle.TRACE_RESOLVE"));
73 COMPILE_THRESHOLD = Integer.parseInt(
74 props.getProperty("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", "0"));
75 LOG_LF_COMPILATION_FAILURE = Boolean.parseBoolean(
76 props.getProperty("java.lang.invoke.MethodHandle.LOG_LF_COMPILATION_FAILURE", "false"));
77 DONT_INLINE_THRESHOLD = Integer.parseInt(
78 props.getProperty("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", "30"));
79 PROFILE_LEVEL = Integer.parseInt(
80 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_LEVEL", "0"));
81 PROFILE_GWT = Boolean.parseBoolean(
82 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_GWT", "true"));
83 CUSTOMIZE_THRESHOLD = Integer.parseInt(
84 props.getProperty("java.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD", "127"));
85 VAR_HANDLE_GUARDS = Boolean.parseBoolean(
86 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_GUARDS", "true"));
87 VAR_HANDLE_IDENTITY_ADAPT = Boolean.parseBoolean(
88 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT", "false"));
89
90 // Do not adjust this except for special platforms:
91 MAX_ARITY = Integer.parseInt(
92 props.getProperty("java.lang.invoke.MethodHandleImpl.MAX_ARITY", "255"));
93
94 if (CUSTOMIZE_THRESHOLD < -1 || CUSTOMIZE_THRESHOLD > 127) {
95 throw newInternalError("CUSTOMIZE_THRESHOLD should be in [-1...127] range");
96 }
97 }
98
99 /** Tell if any of the debugging switches are turned on.
100 * If this is the case, it is reasonable to perform extra checks or save extra information.
101 */
102 /*non-public*/
103 static boolean debugEnabled() {
104 return (DEBUG_METHOD_HANDLE_NAMES |
105 DUMP_CLASS_FILES |
106 TRACE_INTERPRETER |
107 TRACE_METHOD_LINKAGE |
108 LOG_LF_COMPILATION_FAILURE);
109 }
110
111 // handy shared exception makers (they simplify the common case code)
112 /*non-public*/
113 static InternalError newInternalError(String message) {
114 return new InternalError(message);
115 }
116 /*non-public*/
117 static InternalError newInternalError(String message, Exception cause) {
118 return new InternalError(message, cause);
119 }
120 /*non-public*/
121 static InternalError newInternalError(Exception cause) {
122 return new InternalError(cause);
123 }
124 /*non-public*/
125 static RuntimeException newIllegalStateException(String message) {
126 return new IllegalStateException(message);
127 }
128 /*non-public*/
129 static RuntimeException newIllegalStateException(String message, Object obj) {
130 return new IllegalStateException(message(message, obj));
131 }
132 /*non-public*/
133 static RuntimeException newIllegalArgumentException(String message) {
134 return new IllegalArgumentException(message);
135 }
136 /*non-public*/
137 static RuntimeException newIllegalArgumentException(String message, Object obj) {
138 return new IllegalArgumentException(message(message, obj));
139 }
140 /*non-public*/
141 static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
142 return new IllegalArgumentException(message(message, obj, obj2));
143 }
144 /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
145 /*non-public*/
146 static Error uncaughtException(Throwable ex) {
147 if (ex instanceof Error) throw (Error) ex;
148 if (ex instanceof RuntimeException) throw (RuntimeException) ex;
149 throw new InternalError("uncaught exception", ex);
150 }
151 private static String message(String message, Object obj) {
152 if (obj != null) message = message + ": " + obj;
153 return message;
154 }
155 private static String message(String message, Object obj, Object obj2) {
156 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
157 return message;
158 }
159 /*non-public*/
160 static void rangeCheck2(int start, int end, int size) {
161 if (0 > start || start > end || end > size)
162 throw new IndexOutOfBoundsException(start+".."+end);
163 }
164 /*non-public*/
165 static int rangeCheck1(int index, int size) {
166 if (0 > index || index >= size)
167 throw new IndexOutOfBoundsException(index);
168 return index;
169 }
170 }