1 /*
2 * Copyright (c) 2010, 2017, 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.constant.ClassDesc;
27 import java.lang.constant.ConstantDesc;
28 import java.lang.constant.ConstantDescs;
29 import java.lang.constant.DirectMethodHandleDesc;
30 import java.lang.constant.DynamicCallSiteDesc;
31 import java.lang.constant.DynamicConstantDesc;
32 import java.lang.constant.MethodHandleDesc;
33 import java.lang.constant.MethodTypeDesc;
34 import java.lang.invoke.MethodHandle;
35 import java.lang.invoke.MethodHandles;
36 import java.lang.invoke.MethodType;
37 import static java.lang.invoke.MethodType.fromMethodDescriptorString;
38 import java.util.concurrent.atomic.AtomicInteger;
39 import java.util.function.Consumer;
40
41 import jdk.internal.classfile.ClassBuilder;
42 import jdk.internal.classfile.Classfile;
43 import jdk.internal.classfile.CodeBuilder;
44 import jdk.internal.classfile.TypeKind;
45
46 public class InstructionHelper {
47
48 static final AtomicInteger COUNT = new AtomicInteger();
49
50 private static void commonBuild(ClassBuilder classBuilder) {
51 classBuilder
52 .withVersion(55, 0)
53 .withSuperclass(ConstantDescs.CD_Object)
54 .withMethod(ConstantDescs.INIT_NAME, ConstantDescs.MTD_void, Classfile.ACC_PUBLIC,
55 methodBuilder -> methodBuilder
56 .withCode(codeBuilder -> codeBuilder
57 .aload(0)
58 .invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME,
59 ConstantDescs.MTD_void, false)
60 .return_()));
61 }
62
63 public static MethodHandle invokedynamic(MethodHandles.Lookup l, String name, MethodType type, String bsmMethodName,
64 MethodType bsmType, ConstantDesc... boostrapArgs) throws Exception {
65 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
66 byte[] byteArray = Classfile.of().build(genClassDesc, classBuilder -> {
67 commonBuild(classBuilder);
68 classBuilder
69 .withMethod("m", MethodTypeDesc.ofDescriptor(type.toMethodDescriptorString()),
70 Classfile.ACC_PUBLIC + Classfile.ACC_STATIC, methodBuilder -> methodBuilder
71 .withCode(codeBuilder -> {
72 for (int i = 0; i < type.parameterCount(); i++) {
73 codeBuilder.loadInstruction(TypeKind.from(type.parameterType(i)), i);
74 }
75 codeBuilder.invokedynamic(DynamicCallSiteDesc.of(
76 MethodHandleDesc.ofMethod(
77 DirectMethodHandleDesc.Kind.STATIC,
78 classDesc(l.lookupClass()),
79 bsmMethodName,
80 MethodTypeDesc.ofDescriptor(
81 bsmType.toMethodDescriptorString())),
82 name,
83 MethodTypeDesc.ofDescriptor(type.toMethodDescriptorString()),
84 boostrapArgs));
85 codeBuilder.returnInstruction(TypeKind.from(type.returnType()));
86 }));
87 });
88 Class<?> gc = l.defineClass(byteArray);
89 return l.findStatic(gc, "m", type);
90 }
91
92 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, Class<?> type, String bsmMethodName,
93 MethodType bsmType, ConstantDesc... bootstrapArgs) throws Exception {
94 return ldcDynamicConstant(l, name, type, l.lookupClass(), bsmMethodName, bsmType, bootstrapArgs);
95 }
96
97 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, Class<?> type, Class<?> bsmClass,
98 String bsmMethodName, MethodType bsmType, ConstantDesc... bootstrapArgs) throws Exception {
99 return ldcDynamicConstant(l, name, type.descriptorString(), bsmClass.descriptorString(), bsmMethodName,
100 bsmType.descriptorString(), bootstrapArgs);
101 }
102
103 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, String type, String bsmMethodName,
104 String bsmType, ConstantDesc... bootstrapArgs) throws Exception {
105 return ldcDynamicConstant(l, name, type, l.lookupClass().descriptorString(), bsmMethodName, bsmType, bootstrapArgs);
106 }
107
108 public static MethodHandle ldcDynamicConstant(MethodHandles.Lookup l, String name, String type, String bsmClass,
109 String bsmMethodName, String bsmType, ConstantDesc... bootstrapArgs)
110 throws IllegalAccessException, NoSuchMethodException {
111 String methodType = "()" + type;
112 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
113 byte[] bytes = Classfile.of().build(genClassDesc, classBuilder -> {
114 commonBuild(classBuilder);
115 classBuilder.withMethod("m", MethodTypeDesc.of(ClassDesc.ofDescriptor(type)),
116 Classfile.ACC_PUBLIC + Classfile.ACC_STATIC, methodBuilder -> methodBuilder
117 .withCode(codeBuilder -> codeBuilder
118 .ldc(DynamicConstantDesc.ofNamed(
119 MethodHandleDesc.ofMethod(
120 DirectMethodHandleDesc.Kind.STATIC,
121 ClassDesc.ofDescriptor(bsmClass),
122 bsmMethodName,
123 MethodTypeDesc.ofDescriptor(bsmType)),
124 name,
125 ClassDesc.ofDescriptor(type),
126 bootstrapArgs))
127 .returnInstruction(TypeKind.fromDescriptor(type))));
128 });
129 Class<?> gc = l.defineClass(bytes);
130 return l.findStatic(gc, "m", fromMethodDescriptorString(methodType, l.lookupClass().getClassLoader()));
131 }
132
133 public static String csym(Class<?> c) {
134 return c.getCanonicalName().replace('.', '/');
135 }
136
137 public static ClassDesc classDesc(Class<?> c) {
138 return ClassDesc.ofDescriptor(c.descriptorString());
139 }
140
141 public static ClassDesc classDesc(Class<?> c, String suffix) {
142 StringBuilder sb = new StringBuilder(c.descriptorString());
143 String classDescStr = sb.insert(sb.length() - 1, suffix).toString();
144 return ClassDesc.ofDescriptor(classDescStr);
145 }
146
147
148 public static MethodHandle buildMethodHandle(MethodHandles.Lookup l, String methodName, MethodType methodType, Consumer<? super CodeBuilder> builder) {
149 ClassDesc genClassDesc = classDesc(l.lookupClass(), "$Code_" + COUNT.getAndIncrement());
150 return buildMethodHandle(l, genClassDesc, methodName, methodType, builder);
151 }
152
153 public static MethodHandle buildMethodHandle(MethodHandles.Lookup l, ClassDesc classDesc, String methodName, MethodType methodType, Consumer<? super CodeBuilder> builder) {
154 try {
155 byte[] bytes = Classfile.of().build(classDesc, classBuilder -> {
156 classBuilder.withMethod(methodName,
157 MethodTypeDesc.ofDescriptor(methodType.toMethodDescriptorString()),
158 Classfile.ACC_PUBLIC + Classfile.ACC_STATIC,
159 methodBuilder -> methodBuilder.withCode(builder));
160 });
161 Class<?> clazz = l.defineClass(bytes);
162 return l.findStatic(clazz, methodName, methodType);
163 } catch (Throwable t) {
164 t.printStackTrace();
165 throw new RuntimeException("Failed to buildMethodHandle: " + methodName + " type " + methodType);
166 }
167 }
168
169 }