org.adoptopenjdk.jitwatch.jarscan.methodsizehisto.MethodSizeHistoOperation Maven / Gradle / Ivy

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A Maven plugin that scans the project artifact and its dependencies for methods that cannot be inlined by the JIT compiler. It uses the JarScan utility from the JITWatch project to do that. See https://github.com/AdoptOpenJDK/jitwatch .

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/*
 * Copyright (c) 2013-2016 Chris Newland.
 * Licensed under https://github.com/AdoptOpenJDK/jitwatch/blob/master/LICENSE-BSD
 * Instructions: https://github.com/AdoptOpenJDK/jitwatch/wiki
 */
package org.adoptopenjdk.jitwatch.jarscan.methodsizehisto;

import static org.adoptopenjdk.jitwatch.core.JITWatchConstants.C_COMMA;
import static org.adoptopenjdk.jitwatch.core.JITWatchConstants.S_STATIC_INIT;
import static org.adoptopenjdk.jitwatch.core.JITWatchConstants.S_NEWLINE;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.adoptopenjdk.jitwatch.jarscan.IJarScanOperation;
import org.adoptopenjdk.jitwatch.model.MemberSignatureParts;
import org.adoptopenjdk.jitwatch.model.bytecode.BytecodeInstruction;
import org.adoptopenjdk.jitwatch.model.bytecode.MemberBytecode;

public class MethodSizeHistoOperation implements IJarScanOperation
{
	private Map methodSizeMap = new HashMap<>();

	public MethodSizeHistoOperation()
	{
	}

	@Override
	public String getReport()
	{
		List> sortedList = new ArrayList<>(methodSizeMap.entrySet());

		Collections.sort(sortedList, new Comparator>()
		{
			@Override
			public int compare(Map.Entry o1, Map.Entry o2)
			{
				return o2.getValue().compareTo(o1.getValue());
			}
		});

		StringBuilder builder = new StringBuilder();

		for (Map.Entry entry : sortedList)
		{
			int bytecodeSize = entry.getKey();
			int count = entry.getValue();

			builder.append(bytecodeSize);
			builder.append(C_COMMA);
			builder.append(count);
			builder.append(S_NEWLINE);
		}

		return builder.toString();
	}

	@Override
	public void processInstructions(String className, MemberBytecode memberBytecode)
	{
		List instructions = memberBytecode.getInstructions();

		if (instructions != null && instructions.size() > 0)
		{
			BytecodeInstruction lastInstruction = instructions.get(instructions.size() - 1);

			// final instruction is a return for 1 byte
			int bcSize = 1 + lastInstruction.getOffset();

			MemberSignatureParts msp = memberBytecode.getMemberSignatureParts();

			if (!S_STATIC_INIT.equals(msp.getMemberName()))
			{
				Integer existingCount = methodSizeMap.get(bcSize);

				if (existingCount == null)
				{
					methodSizeMap.put(bcSize, 1);
				}
				else
				{
					methodSizeMap.put(bcSize, existingCount + 1);
				}
			}
		}
	}
}