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new 3c38bf6f Improve condy (constant dynamic) support (#139)
3c38bf6f is described below
commit 3c38bf6ff295f82d619d078d836699e2b1377ad7
Author: Alexander Kriegisch <alexan...@kriegisch.name>
AuthorDate: Mon Aug 15 19:53:28 2022 +0200
Improve condy (constant dynamic) support (#139)
* [BCEL-362] Improve condy (constant dynamic) support
Fixes https://issues.apache.org/jira/browse/BCEL-362.
There was a problem when processing JaCoCo-instrumented code with BCEL,
e.g. when passing it through example class JasminVisitor, causing
java.lang.ClassCastException:
class org.apache.bcel.classfile.ConstantMethodref cannot be cast to
class org.apache.bcel.classfile.ConstantClass
(org.apache.bcel.classfile.ConstantMethodref and
org.apache.bcel.classfile.ConstantClass are in unnamed module
of loader 'app')
at
org.apache.bcel.generic.ConstantPoolGen.<init>(ConstantPoolGen.java:153)
at
org.apache.bcel.generic.ConstantPoolGen.<init>(ConstantPoolGen.java:211)
at de.example.JasminVisitor.<init>(JasminVisitor.java:70)
* [BCEL-362] Add test case with JaCoCo-instrumented class file
* We don't use author tags
Instead, we document contributions in `changes.xml` which I'll update after
I merge PR.
Co-authored-by: Gary Gregory <garydgreg...@users.noreply.github.com>
---
.../org/apache/bcel/classfile/ConstantPool.java | 6 ++++
.../org/apache/bcel/generic/ConstantPoolGen.java | 6 ++--
.../apache/bcel/generic/JiraBcel362TestCase.java | 38 +++++++++++++++++++++
src/test/resources/issue362/Bcel362.class | Bin 0 -> 903 bytes
src/test/resources/issue362/Bcel362.java | 28 +++++++++++++++
5 files changed, 76 insertions(+), 2 deletions(-)
diff --git a/src/main/java/org/apache/bcel/classfile/ConstantPool.java
b/src/main/java/org/apache/bcel/classfile/ConstantPool.java
index d8a5514f..b0531cfc 100644
--- a/src/main/java/org/apache/bcel/classfile/ConstantPool.java
+++ b/src/main/java/org/apache/bcel/classfile/ConstantPool.java
@@ -182,6 +182,12 @@ public class ConstantPool implements Cloneable, Node {
+ ":" + constantToString(cid.getNameAndTypeIndex(),
Const.CONSTANT_NameAndType);
break;
+ case Const.CONSTANT_Dynamic:
+ final ConstantDynamic cd = (ConstantDynamic) c;
+ str = cd.getBootstrapMethodAttrIndex()
+ + ":" + constantToString(cd.getNameAndTypeIndex(),
+ Const.CONSTANT_NameAndType);
+ break;
case Const.CONSTANT_Module:
i = ((ConstantModule) c).getNameIndex();
c = getConstant(i, Const.CONSTANT_Utf8);
diff --git a/src/main/java/org/apache/bcel/generic/ConstantPoolGen.java
b/src/main/java/org/apache/bcel/generic/ConstantPoolGen.java
index eb6370e5..a016faf8 100644
--- a/src/main/java/org/apache/bcel/generic/ConstantPoolGen.java
+++ b/src/main/java/org/apache/bcel/generic/ConstantPoolGen.java
@@ -25,6 +25,7 @@ import org.apache.bcel.classfile.Constant;
import org.apache.bcel.classfile.ConstantCP;
import org.apache.bcel.classfile.ConstantClass;
import org.apache.bcel.classfile.ConstantDouble;
+import org.apache.bcel.classfile.ConstantDynamic;
import org.apache.bcel.classfile.ConstantFieldref;
import org.apache.bcel.classfile.ConstantFloat;
import org.apache.bcel.classfile.ConstantInteger;
@@ -170,8 +171,8 @@ public class ConstantPoolGen {
if (c instanceof ConstantInvokeDynamic) {
class_name = Integer.toString(((ConstantInvokeDynamic)
m).getBootstrapMethodAttrIndex());
- // since name can't begin with digit, can use
- // METHODREF_DELIM with out fear of duplicates.
+ } else if (c instanceof ConstantDynamic) {
+ class_name = Integer.toString(((ConstantDynamic)
m).getBootstrapMethodAttrIndex());
} else {
final ConstantClass clazz = (ConstantClass)
constants[m.getClassIndex()];
u8 = (ConstantUtf8) constants[clazz.getNameIndex()];
@@ -184,6 +185,7 @@ public class ConstantPoolGen {
u8 = (ConstantUtf8) constants[n.getSignatureIndex()];
final String signature = u8.getBytes();
+ // Since name cannot begin with digit, we can use
METHODREF_DELIM without fear of duplicates
String delim = METHODREF_DELIM;
if (c instanceof ConstantInterfaceMethodref) {
delim = IMETHODREF_DELIM;
diff --git a/src/test/java/org/apache/bcel/generic/JiraBcel362TestCase.java
b/src/test/java/org/apache/bcel/generic/JiraBcel362TestCase.java
new file mode 100644
index 00000000..53f06f27
--- /dev/null
+++ b/src/test/java/org/apache/bcel/generic/JiraBcel362TestCase.java
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.bcel.generic;
+
+import org.apache.bcel.AbstractTestCase;
+import org.apache.bcel.classfile.JavaClass;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Verify that a constant pool containing dynamic constants (condy) - in this
case created by JaCoCo -
+ * can be read and the corresponding constant is found after parsing.
+ */
+public class JiraBcel362TestCase extends AbstractTestCase {
+ @Test
+ public void testProcessConstantPoolWithCondyEntry() throws
ClassNotFoundException {
+ final JavaClass clazz = getTestClass("issue362.Bcel362");
+ ConstantPoolGen constantPoolGen = assertDoesNotThrow(() -> new
ConstantPoolGen(clazz.getConstantPool()));
+ assertTrue(constantPoolGen.lookupUtf8("$jacocoData") != -1);
+ }
+}
diff --git a/src/test/resources/issue362/Bcel362.class
b/src/test/resources/issue362/Bcel362.class
new file mode 100644
index 00000000..b1e1415e
Binary files /dev/null and b/src/test/resources/issue362/Bcel362.class differ
diff --git a/src/test/resources/issue362/Bcel362.java
b/src/test/resources/issue362/Bcel362.java
new file mode 100644
index 00000000..736dd6c8
--- /dev/null
+++ b/src/test/resources/issue362/Bcel362.java
@@ -0,0 +1,28 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package issue362;
+
+/**
+ * Compile to Java 11 byte code, then instrument with JaCoCo in order to add
+ * condy (constant dynamic) instructions
+ */
+public class Bcel362 {
+ public static void main(String[] args) {
+ System.out.println("Hello world!");
+ }
+}
