testcontrolflowgraph.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 47 行

/*
 * $Id: TestControlFlowGraph.java,v 1.3 2004/02/20 08:21:05 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.ControlFlowGraph;
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 epr
 */
public class TestControlFlowGraph {

	public static void main(String[] args) 
	throws Exception {

		final String className = (args.length > 0) ? args[0] : "java.lang.Object";
		final VmSystemClassLoader loader = new VmSystemClassLoader(new File(".").toURL(), new VmX86Architecture());
		final VmType vmClass = loader.loadClass(className, true);
		
		for (int i = 0; i < vmClass.getNoDeclaredMethods(); i++) {
			TestCFG(vmClass.getDeclaredMethod(i));
		}
	}
	
	private static void TestCFG(VmMethod method) {
		final VmByteCode bc = method.getBytecode();
		System.out.println("Method     " + method);
		System.out.println("MaxStack   " + bc.getMaxStack());
		System.out.println("#Locals    " + bc.getNoLocals());
		System.out.println("#Arg slots " + method.getArgSlotCount());
		final ControlFlowGraph cfg = new ControlFlowGraph(method.getBytecode());
		BytecodeParser.parse(method.getBytecode(), new BytecodeViewer(cfg));

		System.out.println();
	}
	
}