2. Intermediate Representation

0 Supplementary Materials

0.1 P25 (invoke in JVM)

• invokespecial: call constructor, call superclass methods, call private methods
• invokevirtual: call instance methods (virtual dispatch)
• invokeinterface: cannot optimization, checking interface implementation
• invokestatic: call static methods
• invokedynamic: Java 7 Java static typing, dynamic language runs on JVM

0.2 P25 (Method signature)

className: returnType methodName(parameter1Type, parameter2Type, ...)

e.g.

specialinvoke $r3.<java.lang.StringBuilder: void <init>()>();

$r4 = virtualinvoke $r3.<java.lang.StringBuilder: java.lang.StringBuilder append(java.lang.String)>(r1);

The name of the constructor in JVM is <init>

0.3 P28 (<init> and <clinit> in JVM)

<init>is the (or one of the) constructor(s) for the instance and non-static field initialization.

<clinit>are the static initialization blocks for the class and static field initialization.

class X {

   static Log log = LogFactory.getLog(); // <clinit>

   private int x = 1;   // <init>

   X(){
      // <init>
   }

   static {
      // <clinit>
   }

}

class A {
    B b = ...; // JVM call the <clinit> method of class B
}