inlinetest.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 51 行

/*
 * $Id: InlineTest.java,v 1.2 2004/01/02 08:41:55 epr Exp $
 */
package org.jnode.test;

import java.io.File;

import org.jnode.vm.VmSystemClassLoader;
import org.jnode.vm.bytecode.BytecodeParser;
import org.jnode.vm.bytecode.BytecodeViewer;
import org.jnode.vm.bytecode.MethodInliner;
import org.jnode.vm.bytecode.SimpleInlineOracle;
import org.jnode.vm.classmgr.VmByteCode;
import org.jnode.vm.classmgr.VmMethod;
import org.jnode.vm.classmgr.VmType;
import org.jnode.vm.x86.VmX86Architecture;

/**
 * @author Ewout Prangsma ([e-mail])
 */
public class InlineTest {

	public static void main(String[] args) throws Exception {
		final String clsName = InlineTestClass.class.getName();

		final VmSystemClassLoader cl = new VmSystemClassLoader(new File(".").toURL(), new VmX86Architecture());
		final VmType type = cl.loadClass(clsName, true);

		// First show all declared methods
		for (int i = 0; i < type.getNoDeclaredMethods(); i++) {
			final VmMethod m = type.getDeclaredMethod(i);
			System.out.println("\n*** Original " + m.getName() + " ***");
			BytecodeParser.parse(m.getBytecode(), new BytecodeViewer());
		}

		// Now inline the foo method
		final VmMethod method = type.getMethod("foo", "()V");
		final MethodInliner inliner = new MethodInliner(method.getBytecode());
		final SimpleInlineOracle oracle = new SimpleInlineOracle();

		final long start = System.currentTimeMillis();
		final int count = inliner.inline(oracle, cl);
		final VmByteCode result = inliner.toByteCode();
		final long end = System.currentTimeMillis();
		System.out.println("Inlined " + count + " method call(s) took " + (end - start) + "ms");
		// Show the result
		System.out.println("\n*** The result ***");
		BytecodeParser.parse(result, new BytecodeViewer());
	}
}