JSR/RET JVM instructions usage sample

HelloJSR.class

HelloJSR.jasm

/**
 * JSR/RET cannot be used in class files with version 51.0 or above but still supported by JVM for class file version 50.* and below.
 */
super public class HelloJSR
	version 50:0
{


public Method "<init>":"()V"
	stack 1 locals 1
{
		aload_0;
		invokespecial	Method java/lang/Object."<init>":"()V";
		return;
}

public static varargs Method main:"([Ljava/lang/String;)V"
	stack 2 locals 2
{
		jsr Hello;
		jsr World;
		return;

	World:
		astore_1;
		getstatic	Field java/lang/System.out:"Ljava/io/PrintStream;";
		ldc	String "world!";
		invokevirtual	Method java/io/PrintStream.println:"(Ljava/lang/String;)V";
		ret 1;

	Hello:
		astore_1;
		getstatic	Field java/lang/System.out:"Ljava/io/PrintStream;";
		ldc	String "Hello, ";
		invokevirtual	Method java/io/PrintStream.print:"(Ljava/lang/String;)V";
		ret 1;

}

} // end Class HelloJSR