HeapCLONEARRAY.java

package com.foursquare.heapaudit;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.Opcodes;

class HeapCLONEARRAY extends HeapUtil {

    // Allocations by the clone method on any array type are triggered via calls
    // to visitMethodInsn(INVOKEVIRTUAL) where it returns a reference to the
    // newly allocated array object.

    static void after(boolean debug,
                      boolean trace,
                      MethodAdapter mv,
                      String owner) {

        log(debug,
            trace,
            mv,
            "\tCLONEARRAY.after");

        Label finish = new Label();

        if (HeapSettings.conditional) {

            // STACK: [...|obj]
            visitCheck(mv,
                       finish);
            // STACK: [...|obj]

        }

        // STACK: [...|obj]
        mv.visitInsn(Opcodes.DUP);
        // STACK: [...|obj|obj]
        mv.visitTypeInsn(Opcodes.CHECKCAST,
                         owner);
        // STACK: [...|obj|obj]

        if (owner.charAt(1) != '[') {                                                                                                                                                      

            // STACK: [...|obj|obj]
            mv.visitInsn(Opcodes.DUP);
            // STACK: [...|obj|obj|obj]
            mv.visitInsn(Opcodes.ARRAYLENGTH);
            // STACK: [...|obj|obj|count]
            mv.visitLdcInsn(owner.substring(1));
            // STACK: [...|obj|obj|count|type]
            mv.visitLdcInsn((long)-1);
            // STACK: [...|obj|obj|count|type|size]
            mv.visitMethodInsn(Opcodes.INVOKESTATIC,
                               "com/foursquare/heapaudit/HeapUtil",
                               "record",
                               "(Ljava/lang/Object;ILjava/lang/String;J)V");
            // STACK: [...|obj]

        }
        else {

            // STACK: [...|obj|obj]
            mv.visitLdcInsn(owner);
            // STACK: [...|obj|obj|type]
            mv.visitMethodInsn(Opcodes.INVOKESTATIC,
                               "com/foursquare/heapaudit/HeapUtil",
                               "record",
                               "(Ljava/lang/Object;Ljava/lang/String;)V");
            // STACK: [...|obj]

        }

        if (HeapSettings.conditional) {

            // STACK: [...|obj]
            visitFinish(mv,
                        finish);
            // STACK: [...|obj]

        }

    }

}