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/*
* 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.drill.exec.compile.bytecode;
import java.io.PrintWriter;
import org.apache.commons.io.output.StringBuilderWriter;
import org.apache.drill.exec.compile.CheckMethodVisitorFsm;
import org.apache.drill.exec.compile.CompilationConfig;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.util.Textifier;
import org.objectweb.asm.util.TraceMethodVisitor;
public class ValueHolderReplacementVisitor extends ClassVisitor {
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ValueHolderReplacementVisitor.class);
private final boolean verifyBytecode;
private String className; // fully qualified internal class name
public ValueHolderReplacementVisitor(ClassVisitor cw, boolean verifyBytecode) {
super(CompilationConfig.ASM_API_VERSION, cw);
this.verifyBytecode = verifyBytecode;
}
@Override
public void visit(final int version, final int access, final String name, final String signature,
final String superName, final String[] interfaces) {
// capture the name of the class for later analysis
className = name;
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor innerVisitor = super.visitMethod(access, name, desc, signature, exceptions);
// innerVisitor = new Debugger(access, name, desc, signature, exceptions, innerVisitor);
if (verifyBytecode) {
innerVisitor = new CheckMethodVisitorFsm(api, innerVisitor);
}
return new ScalarReplacementNode(className, access, name, desc, signature,
exceptions,innerVisitor, verifyBytecode);
}
private static class Debugger extends MethodNode {
MethodVisitor inner;
public Debugger(int access, String name, String desc, String signature, String[] exceptions, MethodVisitor inner) {
super(access, name, desc, signature, exceptions);
this.inner = inner;
}
@Override
public void visitEnd() {
try {
accept(inner);
super.visitEnd();
} catch(Exception e){
Textifier t = new Textifier();
accept(new TraceMethodVisitor(t));
StringBuilderWriter sw = new StringBuilderWriter();
PrintWriter pw = new PrintWriter(sw);
t.print(pw);
pw.flush();
String bytecode = sw.getBuilder().toString();
logger.error(String.format("Failure while rendering method %s, %s, %s. ByteCode:\n %s", name, desc, signature, bytecode), e);
throw new RuntimeException(String.format("Failure while rendering method %s, %s, %s. ByteCode:\n %s", name, desc, signature, bytecode), e);
}
}
}
}
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