1 /*
2 * Copyright (c) 2010, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package test.java.lang.invoke.lib;
25
26 import java.lang.classfile.ClassBuilder;
27 import java.lang.classfile.ClassFile;
28 import java.lang.classfile.CodeBuilder;
29 import java.lang.classfile.TypeKind;
30
31 import java.lang.constant.*;
32 import java.lang.invoke.MethodHandle;
33 import java.lang.invoke.MethodHandles;
34 import java.lang.invoke.MethodType;
35 import static java.lang.invoke.MethodType.fromMethodDescriptorString;
36 import java.util.concurrent.atomic.AtomicInteger;
37 import java.util.function.Consumer;
38
39 public class InstructionHelper {
40
41 static final AtomicInteger COUNT = new AtomicInteger();
42
43 private static void commonBuild(ClassBuilder classBuilder) {
44 classBuilder
45 .withVersion(55, 0)
46 .withSuperclass(ConstantDescs.CD_Object)
47 .withMethod(ConstantDescs.INIT_NAME, ConstantDescs.MTD_void, ClassFile.ACC_PUBLIC,
48 methodBuilder -> methodBuilder
49 .withCode(codeBuilder -> codeBuilder
50 .aload(0)
51 .invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME,
52 ConstantDescs.MTD_void, false)
53 .return_()));
54 }
55
56 public static MethodHandle invokedynamic(MethodHandles.Lookup l, String name, MethodType type, String bsmMethodName,
57 MethodType bsmType, ConstantDesc... boostrapArgs) throws Exception {
58 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
59 byte[] byteArray = ClassFile.of().build(genClassDesc, classBuilder -> {
60 commonBuild(classBuilder);
61 classBuilder
62 .withMethod("m", MethodTypeDesc.ofDescriptor(type.toMethodDescriptorString()),
63 ClassFile.ACC_PUBLIC + ClassFile.ACC_STATIC, methodBuilder -> methodBuilder
64 .withCode(codeBuilder -> {
65 for (int i = 0; i < type.parameterCount(); i++) {
66 codeBuilder.loadLocal(TypeKind.from(type.parameterType(i)), i);
67 }
68 codeBuilder.invokedynamic(DynamicCallSiteDesc.of(
69 MethodHandleDesc.ofMethod(
70 DirectMethodHandleDesc.Kind.STATIC,
71 classDesc(l.lookupClass()),
72 bsmMethodName,
73 MethodTypeDesc.ofDescriptor(
74 bsmType.toMethodDescriptorString())),
75 name,
76 MethodTypeDesc.ofDescriptor(type.toMethodDescriptorString()),
77 boostrapArgs));
78 codeBuilder.return_(TypeKind.from(type.returnType()));
79 }));
80 });
81 Class<?> gc = l.defineClass(byteArray);
82 return l.findStatic(gc, "m", type);
83 }
84
85 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, Class<?> type, String bsmMethodName,
86 MethodType bsmType, ConstantDesc... bootstrapArgs) throws Exception {
87 return ldcDynamicConstant(l, name, type, l.lookupClass(), bsmMethodName, bsmType, bootstrapArgs);
88 }
89
90 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, Class<?> type, Class<?> bsmClass,
91 String bsmMethodName, MethodType bsmType, ConstantDesc... bootstrapArgs) throws Exception {
92 return ldcDynamicConstant(l, name, type.descriptorString(), bsmClass.descriptorString(), bsmMethodName,
93 bsmType.descriptorString(), bootstrapArgs);
94 }
95
96 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, String type, String bsmMethodName,
97 String bsmType, ConstantDesc... bootstrapArgs) throws Exception {
98 return ldcDynamicConstant(l, name, type, l.lookupClass().descriptorString(), bsmMethodName, bsmType, bootstrapArgs);
99 }
100
101 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, String type, String bsmClass,
102 String bsmMethodName, String bsmType, ConstantDesc... bootstrapArgs)
103 throws IllegalAccessException, NoSuchMethodException {
104 String methodType = "()" + type;
105 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
106 byte[] bytes = ClassFile.of().build(genClassDesc, classBuilder -> {
107 commonBuild(classBuilder);
108 classBuilder.withMethod("m", MethodTypeDesc.of(ClassDesc.ofDescriptor(type)),
109 ClassFile.ACC_PUBLIC + ClassFile.ACC_STATIC, methodBuilder -> methodBuilder
110 .withCode(codeBuilder -> codeBuilder
111 .ldc(DynamicConstantDesc.ofNamed(
112 MethodHandleDesc.ofMethod(
113 DirectMethodHandleDesc.Kind.STATIC,
114 ClassDesc.ofDescriptor(bsmClass),
115 bsmMethodName,
116 MethodTypeDesc.ofDescriptor(bsmType)),
117 name,
118 ClassDesc.ofDescriptor(type),
119 bootstrapArgs))
120 .return_(TypeKind.fromDescriptor(type))));
121 });
122 Class<?> gc = l.defineClass(bytes);
123 return l.findStatic(gc, "m", fromMethodDescriptorString(methodType, l.lookupClass().getClassLoader()));
124 }
125
126 public static String csym(Class<?> c) {
127 return c.getCanonicalName().replace('.', '/');
128 }
129
130 public static ClassDesc classDesc(Class<?> c) {
131 return ClassDesc.ofDescriptor(c.descriptorString());
132 }
133
134 public static ClassDesc classDesc(Class<?> c, String suffix) {
135 StringBuilder sb = new StringBuilder(c.descriptorString());
136 String classDescStr = sb.insert(sb.length() - 1, suffix).toString();
137 return ClassDesc.ofDescriptor(classDescStr);
138 }
139
140
141 public static MethodHandle buildMethodHandle(MethodHandles.Lookup l, String methodName, MethodType methodType, Consumer<? super CodeBuilder> builder) {
142 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
143 return buildMethodHandle(l, genClassDesc, methodName, methodType, builder);
144 }
145
146 public static MethodHandle buildMethodHandle(MethodHandles.Lookup l, ClassDesc classDesc, String methodName, MethodType methodType, Consumer<? super CodeBuilder> builder) {
147 try {
148 byte[] bytes = ClassFile.of().build(classDesc, classBuilder -> {
149 classBuilder.withMethod(methodName,
150 MethodTypeDesc.ofDescriptor(methodType.toMethodDescriptorString()),
151 ClassFile.ACC_PUBLIC + ClassFile.ACC_STATIC,
152 methodBuilder -> methodBuilder.withCode(builder));
153 });
154 Class<?> clazz = l.defineClass(bytes);
155 return l.findStatic(clazz, methodName, methodType);
156 } catch (Throwable t) {
157 t.printStackTrace();
158 throw new RuntimeException("Failed to buildMethodHandle: " + methodName + " type " + methodType);
159 }
160 }
161
162 }