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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.util.LinkedList;
import org.apache.drill.exec.compile.CheckMethodVisitorFsm;
import org.apache.drill.exec.compile.CompilationConfig;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.analysis.AnalyzerException;
import org.objectweb.asm.tree.analysis.BasicValue;
import org.objectweb.asm.tree.analysis.Frame;
public class ScalarReplacementNode extends MethodNode {
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ScalarReplacementNode.class);
private final boolean verifyBytecode;
private final String className;
private final String[] exceptionsArr;
private final MethodVisitor inner;
public ScalarReplacementNode(final String className, final int access, final String name,
final String desc, final String signature, final String[] exceptions, final MethodVisitor inner,
final boolean verifyBytecode) {
super(CompilationConfig.ASM_API_VERSION, access, name, desc, signature, exceptions);
this.className = className;
this.exceptionsArr = exceptions;
this.inner = inner;
this.verifyBytecode = verifyBytecode;
}
@Override
public void visitEnd() {
/*
* Note this is a MethodNode, not a MethodVisitor. As a result, calls to the various visitX()
* methods will be building up a method. Then, once we analyze it, we use accept() to visit that
* method and transform it with the InstructionModifier at the bottom.
*/
super.visitEnd();
final LinkedList<ReplacingBasicValue> valueList = new LinkedList<>();
final MethodAnalyzer<BasicValue> analyzer =
new MethodAnalyzer<>(new ReplacingInterpreter(className, valueList));
Frame<BasicValue>[] frames;
try {
frames = analyzer.analyze(className, this);
} catch (final AnalyzerException e) {
throw new IllegalStateException(e);
}
if (logger.isTraceEnabled()) {
final StringBuilder sb = new StringBuilder();
sb.append("ReplacingBasicValues for " + className + "\n");
for(final ReplacingBasicValue value : valueList) {
value.dump(sb, 2);
sb.append('\n');
}
logger.debug(sb.toString());
}
// wrap the instruction handler so that we can do additional things
final TrackingInstructionList list = new TrackingInstructionList(frames, this.instructions);
this.instructions = list;
MethodVisitor methodVisitor = inner;
if (verifyBytecode) {
methodVisitor = new CheckMethodVisitorFsm(CompilationConfig.ASM_API_VERSION, methodVisitor);
}
final InstructionModifier holderV = new InstructionModifier(this.access, this.name, this.desc,
this.signature, this.exceptionsArr, list, methodVisitor);
accept(holderV);
}
}
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