com.hazelcast.org.codehaus.commons.compiler.util.Disassembler Maven / Gradle / Ivy
/*
* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2018 Arno Unkrig. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.hazelcast.org.codehaus.commons.compiler.util;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import com.hazelcast.org.codehaus.commons.nullanalysis.Nullable;
/**
* Generates human-readable Java assembler code from Java bytecode.
*/
public final
class Disassembler {
@Nullable private static Object disassemblerInstance;
static {
@Nullable Class> disassemblerClass;
try {
disassemblerClass = Class.forName("de.unkrig.jdisasm.Disassembler");
} catch (ClassNotFoundException cnfe) {
System.err.println((
"Notice: Could not disassemble class file for logging because "
+ "\"de.unkrig.jdisasm.Disassembler\" is not on the classpath. "
+ "If you are interested in disassemblies of class files generated by JANINO, "
+ "get de.unkrig.jdisasm and put it on the classpath."
));
disassemblerClass = null;
}
if (disassemblerClass != null) {
try {
Disassembler.disassemblerInstance = disassemblerClass.getConstructor().newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private Disassembler() {}
/**
* Loads a "{@code de.unkrig.jdisasm.Disassembler}" through reflection (to avoid a compile-time dependency) and
* uses it to disassemble the given bytes to {@code System.out}.
*
* Prints an error message to {@code System.err} if that class cannot be loaded through the classpath.
*
*
* System variable {@code disasm.verbose} controls whether the disassembler operates in "verbose" mode. The
* default is {@code false}.
*
*/
public static void
disassembleToStdout(byte[] contents) {
Object d = Disassembler.disassemblerInstance;
if (d == null) return;
try {
for (String attributeName : new String[] {
"verbose",
"showClassPoolIndexes",
"dumpConstantPool",
"printAllAttributes",
"printStackMap",
"showLineNumbers",
"showVariableNames",
"symbolicLabels",
"printAllOffsets",
}) {
String pv = SystemProperties.getClassProperty(Disassembler.class, attributeName);
if (pv != null) {
boolean argument = Boolean.parseBoolean(pv);
final String setterMethodName = (
"set"
+ Character.toUpperCase(attributeName.charAt(0))
+ attributeName.substring(1)
);
d.getClass().getMethod(setterMethodName, boolean.class).invoke(d, argument);
}
}
d.getClass().getMethod("disasm", InputStream.class).invoke(d, new ByteArrayInputStream(contents));
} catch (Exception e) {
e.printStackTrace();
}
}
}
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