author | egahlin |
Tue, 13 Aug 2019 03:58:29 +0200 | |
branch | JEP-349-branch |
changeset 57717 | 4ce66d271065 |
parent 52515 | 746df0ae4fe1 |
permissions | -rw-r--r-- |
50113 | 1 |
/* |
2 |
* Copyright (c) 2016, 2018, 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 jdk.jfr.internal; |
|
27 |
||
28 |
import java.util.List; |
|
29 |
import java.util.concurrent.atomic.AtomicLong; |
|
30 |
||
31 |
import jdk.internal.org.objectweb.asm.AnnotationVisitor; |
|
32 |
import jdk.internal.org.objectweb.asm.ClassWriter; |
|
33 |
import jdk.internal.org.objectweb.asm.Label; |
|
34 |
import jdk.internal.org.objectweb.asm.MethodVisitor; |
|
35 |
import jdk.internal.org.objectweb.asm.Opcodes; |
|
36 |
import jdk.internal.org.objectweb.asm.Type; |
|
37 |
import jdk.internal.org.objectweb.asm.commons.GeneratorAdapter; |
|
38 |
import jdk.internal.org.objectweb.asm.commons.Method; |
|
39 |
import jdk.jfr.AnnotationElement; |
|
40 |
import jdk.jfr.Event; |
|
41 |
import jdk.jfr.ValueDescriptor; |
|
42 |
||
43 |
||
44 |
// Helper class for building dynamic events |
|
45 |
public final class EventClassBuilder { |
|
46 |
||
47 |
private static final Type TYPE_EVENT = Type.getType(Event.class); |
|
48 |
private static final Type TYPE_IOBE = Type.getType(IndexOutOfBoundsException.class); |
|
49 |
private static final Method DEFAULT_CONSTRUCTOR = Method.getMethod("void <init> ()"); |
|
50 |
private static final Method SET_METHOD = Method.getMethod("void set (int, java.lang.Object)"); |
|
51 |
private static final AtomicLong idCounter = new AtomicLong(); |
|
52 |
private final ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES); |
|
53 |
private final String fullClassName; |
|
54 |
private final Type type; |
|
55 |
private final List<ValueDescriptor> fields; |
|
56 |
private final List<AnnotationElement> annotationElements; |
|
57 |
||
58 |
public EventClassBuilder(List<AnnotationElement> annotationElements, List<ValueDescriptor> fields) { |
|
59 |
this.fullClassName = "jdk.jfr.DynamicEvent" + idCounter.incrementAndGet(); |
|
52515 | 60 |
this.type = Type.getType("L" + fullClassName.replace(".", "/") + ";"); |
50113 | 61 |
this.fields = fields; |
62 |
this.annotationElements = annotationElements; |
|
63 |
} |
|
64 |
||
65 |
public Class<? extends Event> build() { |
|
66 |
buildClassInfo(); |
|
67 |
buildConstructor(); |
|
68 |
buildFields(); |
|
69 |
buildSetMethod(); |
|
70 |
endClass(); |
|
71 |
byte[] bytes = classWriter.toByteArray(); |
|
72 |
ASMToolkit.logASM(fullClassName, bytes); |
|
52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
50113
diff
changeset
|
73 |
return SecuritySupport.defineClass(Event.class, bytes).asSubclass(Event.class); |
50113 | 74 |
} |
75 |
||
76 |
private void endClass() { |
|
77 |
classWriter.visitEnd(); |
|
78 |
} |
|
79 |
||
80 |
private void buildSetMethod() { |
|
81 |
GeneratorAdapter ga = new GeneratorAdapter(Opcodes.ACC_PUBLIC, SET_METHOD, null, null, classWriter); |
|
82 |
int index = 0; |
|
83 |
for (ValueDescriptor v : fields) { |
|
84 |
ga.loadArg(0); |
|
85 |
ga.visitLdcInsn(index); |
|
86 |
Label notEqual = new Label(); |
|
87 |
ga.ifICmp(GeneratorAdapter.NE, notEqual); |
|
88 |
ga.loadThis(); |
|
89 |
ga.loadArg(1); |
|
90 |
Type fieldType = ASMToolkit.toType(v); |
|
91 |
ga.unbox(ASMToolkit.toType(v)); |
|
92 |
ga.putField(type, v.getName(), fieldType); |
|
93 |
ga.visitInsn(Opcodes.RETURN); |
|
94 |
ga.visitLabel(notEqual); |
|
95 |
index++; |
|
96 |
} |
|
97 |
ga.throwException(TYPE_IOBE, "Index must between 0 and " + fields.size()); |
|
98 |
ga.endMethod(); |
|
99 |
} |
|
100 |
||
101 |
private void buildConstructor() { |
|
102 |
MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PUBLIC, DEFAULT_CONSTRUCTOR.getName(), DEFAULT_CONSTRUCTOR.getDescriptor(), null, null); |
|
103 |
mv.visitIntInsn(Opcodes.ALOAD, 0); |
|
104 |
ASMToolkit.invokeSpecial(mv, TYPE_EVENT.getInternalName(), DEFAULT_CONSTRUCTOR); |
|
105 |
mv.visitInsn(Opcodes.RETURN); |
|
106 |
mv.visitMaxs(0, 0); |
|
107 |
} |
|
108 |
||
109 |
private void buildClassInfo() { |
|
110 |
String internalSuperName = ASMToolkit.getInternalName(Event.class.getName()); |
|
111 |
String internalClassName = type.getInternalName(); |
|
112 |
classWriter.visit(52, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, internalClassName, null, internalSuperName, null); |
|
113 |
||
114 |
for (AnnotationElement a : annotationElements) { |
|
115 |
String descriptor = ASMToolkit.getDescriptor(a.getTypeName()); |
|
116 |
AnnotationVisitor av = classWriter.visitAnnotation(descriptor, true); |
|
117 |
for (ValueDescriptor v : a.getValueDescriptors()) { |
|
118 |
Object value = a.getValue(v.getName()); |
|
119 |
String name = v.getName(); |
|
120 |
if (v.isArray()) { |
|
121 |
AnnotationVisitor arrayVisitor = av.visitArray(name); |
|
122 |
Object[] array = (Object[]) value; |
|
123 |
for (int i = 0; i < array.length; i++) { |
|
124 |
arrayVisitor.visit(null, array[i]); |
|
125 |
} |
|
126 |
arrayVisitor.visitEnd(); |
|
127 |
} else { |
|
128 |
av.visit(name, value); |
|
129 |
} |
|
130 |
} |
|
131 |
av.visitEnd(); |
|
132 |
} |
|
133 |
} |
|
134 |
||
135 |
private void buildFields() { |
|
136 |
for (ValueDescriptor v : fields) { |
|
137 |
String internal = ASMToolkit.getDescriptor(v.getTypeName()); |
|
138 |
classWriter.visitField(Opcodes.ACC_PRIVATE, v.getName(), internal, null, null); |
|
139 |
// No need to store annotations on field since they will be replaced anyway. |
|
140 |
} |
|
141 |
} |
|
142 |
} |