1 /*
2 * Copyright (c) 2011, 2024, 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.CDS;
29 import jdk.internal.misc.Unsafe;
30 import jdk.internal.util.ClassFileDumper;
31 import sun.security.action.GetPropertyAction;
32
33 import java.lang.reflect.ClassFileFormatVersion;
34 import java.util.Properties;
35
36 import static java.lang.invoke.LambdaForm.basicTypeSignature;
37 import static java.lang.invoke.LambdaForm.shortenSignature;
38
39 /**
40 * This class consists exclusively of static names internal to the
41 * method handle implementation.
42 * Usage: {@code import static java.lang.invoke.MethodHandleStatics.*}
43 * @author John Rose, JSR 292 EG
44 */
45 /*non-public*/
46 class MethodHandleStatics {
47
48 private MethodHandleStatics() { } // do not instantiate
49
50 static final Unsafe UNSAFE = Unsafe.getUnsafe();
51 static final int CLASSFILE_VERSION = ClassFileFormatVersion.latest().major();
52 static final boolean DEBUG_METHOD_HANDLE_NAMES;
53 static final boolean TRACE_INTERPRETER;
54 static final boolean TRACE_METHOD_LINKAGE;
55 static final boolean TRACE_RESOLVE;
56 static final int COMPILE_THRESHOLD;
57 static final boolean LOG_LF_COMPILATION_FAILURE;
58 static final int DONT_INLINE_THRESHOLD;
59 static final int PROFILE_LEVEL;
60 static final boolean PROFILE_GWT;
61 static final int CUSTOMIZE_THRESHOLD;
62 static final boolean NO_SOFT_CACHE; // Do not use SoftReference for various caching operations.
63 static final boolean VAR_HANDLE_GUARDS;
64 static final int MAX_ARITY;
65 static final boolean VAR_HANDLE_IDENTITY_ADAPT;
66 static final boolean VAR_HANDLE_SEGMENT_FORCE_EXACT;
67 static final ClassFileDumper DUMP_CLASS_FILES;
68
69 static {
70 Properties props = GetPropertyAction.privilegedGetProperties();
71 DEBUG_METHOD_HANDLE_NAMES = Boolean.parseBoolean(
72 props.getProperty("java.lang.invoke.MethodHandle.DEBUG_NAMES"));
73
74 TRACE_INTERPRETER = Boolean.parseBoolean(
75 props.getProperty("java.lang.invoke.MethodHandle.TRACE_INTERPRETER"));
76 TRACE_METHOD_LINKAGE = Boolean.parseBoolean(
77 props.getProperty("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE"));
78 TRACE_RESOLVE = Boolean.parseBoolean(
79 props.getProperty("java.lang.invoke.MethodHandle.TRACE_RESOLVE"));
80 COMPILE_THRESHOLD = Integer.parseInt(
81 props.getProperty("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", "0"));
82 LOG_LF_COMPILATION_FAILURE = Boolean.parseBoolean(
83 props.getProperty("java.lang.invoke.MethodHandle.LOG_LF_COMPILATION_FAILURE", "false"));
84 DONT_INLINE_THRESHOLD = Integer.parseInt(
85 props.getProperty("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", "30"));
86 PROFILE_LEVEL = Integer.parseInt(
87 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_LEVEL", "0"));
88 PROFILE_GWT = Boolean.parseBoolean(
89 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_GWT", "true"));
90 CUSTOMIZE_THRESHOLD = Integer.parseInt(
91 props.getProperty("java.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD", "127"));
92 NO_SOFT_CACHE = Boolean.parseBoolean(
93 props.getProperty("java.lang.invoke.MethodHandle.NO_SOFT_CACHE", "false"));
94 VAR_HANDLE_GUARDS = Boolean.parseBoolean(
95 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_GUARDS", "true"));
96 VAR_HANDLE_IDENTITY_ADAPT = Boolean.parseBoolean(
97 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT", "false"));
98 VAR_HANDLE_SEGMENT_FORCE_EXACT = Boolean.parseBoolean(
99 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_SEGMENT_FORCE_EXACT", "false"));
100
101 // Do not adjust this except for special platforms:
102 MAX_ARITY = Integer.parseInt(
103 props.getProperty("java.lang.invoke.MethodHandleImpl.MAX_ARITY", "255"));
104
105 DUMP_CLASS_FILES = ClassFileDumper.getInstance("jdk.invoke.MethodHandle.dumpMethodHandleInternals",
106 "DUMP_METHOD_HANDLE_INTERNALS");
107
108 if (CUSTOMIZE_THRESHOLD < -1 || CUSTOMIZE_THRESHOLD > 127) {
109 throw newInternalError("CUSTOMIZE_THRESHOLD should be in [-1...127] range");
110 }
111 }
112
113 /** Tell if any of the debugging switches are turned on.
114 * If this is the case, it is reasonable to perform extra checks or save extra information.
115 */
116 /*non-public*/
117 static boolean debugEnabled() {
118 return (DEBUG_METHOD_HANDLE_NAMES |
119 DUMP_CLASS_FILES.isEnabled() |
120 TRACE_INTERPRETER |
121 TRACE_METHOD_LINKAGE |
122 LOG_LF_COMPILATION_FAILURE);
123 }
124
125 static ClassFileDumper dumper() {
126 return DUMP_CLASS_FILES;
127 }
128
129 /**
130 * If requested, logs the result of resolving the LambdaForm to stdout
131 * and informs the CDS subsystem about it.
132 */
133 /*non-public*/
134 static void traceLambdaForm(String name, MethodType type, Class<?> holder, MemberName resolvedMember) {
135 if (TRACE_RESOLVE) {
136 System.out.println("[LF_RESOLVE] " + holder.getName() + " " + name + " " +
137 shortenSignature(basicTypeSignature(type)) +
138 (resolvedMember != null ? " (success)" : " (fail)"));
139 }
140 if (CDS.isLoggingLambdaFormInvokers()) {
141 CDS.logLambdaFormInvoker("[LF_RESOLVE]", holder.getName(), name, shortenSignature(basicTypeSignature(type)));
142 }
143 }
144
145 /**
146 * If requested, logs the result of resolving the species type to stdout
147 * and the CDS subsystem.
148 */
149 /*non-public*/
150 static void traceSpeciesType(String cn, Class<?> salvage) {
151 if (TRACE_RESOLVE) {
152 System.out.println("[SPECIES_RESOLVE] " + cn + (salvage != null ? " (salvaged)" : " (generated)"));
153 }
154 if (CDS.isLoggingLambdaFormInvokers()) {
155 CDS.logSpeciesType("[SPECIES_RESOLVE]", cn);
156 }
157 }
158 // handy shared exception makers (they simplify the common case code)
159 /*non-public*/
160 static InternalError newInternalError(String message) {
161 return new InternalError(message);
162 }
163 /*non-public*/
164 static InternalError newInternalError(String message, Exception cause) {
165 return new InternalError(message, cause);
166 }
167 /*non-public*/
168 static InternalError newInternalError(Exception cause) {
169 return new InternalError(cause);
170 }
171 /*non-public*/
172 static RuntimeException newIllegalStateException(String message) {
173 return new IllegalStateException(message);
174 }
175 /*non-public*/
176 static RuntimeException newIllegalStateException(String message, Object obj) {
177 return new IllegalStateException(message(message, obj));
178 }
179 /*non-public*/
180 static RuntimeException newIllegalArgumentException(String message) {
181 return new IllegalArgumentException(message);
182 }
183 /*non-public*/
184 static RuntimeException newIllegalArgumentException(String message, Object obj) {
185 return new IllegalArgumentException(message(message, obj));
186 }
187 /*non-public*/
188 static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
189 return new IllegalArgumentException(message(message, obj, obj2));
190 }
191 /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
192 /*non-public*/
193 static Error uncaughtException(Throwable ex) {
194 if (ex instanceof Error error) throw error;
195 if (ex instanceof RuntimeException re) throw re;
196 throw new InternalError("uncaught exception", ex);
197 }
198 private static String message(String message, Object obj) {
199 if (obj != null) message = message + ": " + obj;
200 return message;
201 }
202 private static String message(String message, Object obj, Object obj2) {
203 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2;
204 return message;
205 }
206 }