Jassist150.java

import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.NotFoundException;
import javassist.expr.ExprEditor;
import javassist.expr.MethodCall;

public class Jassist150 {
    public static final String BASE_PATH = "./";
    public static final String JAVASSIST_JAR = BASE_PATH + "javassist.jar";
    public static final String CLASSES_FOLDER = BASE_PATH + "build/classes";
    public static final String TEST_CLASSES_FOLDER = BASE_PATH
            + "build/test-classes";

    public static class Inner1 {
        public static int get() {
            return 0;
        }
    }

    public static void implTestClassTailCache() throws NotFoundException,
            CannotCompileException {
        ClassPool pool = new ClassPool(true);
        for (int paths = 0; paths < 50; paths++) {
            pool.appendClassPath(JAVASSIST_JAR);
            pool.appendClassPath(CLASSES_FOLDER);
            pool.appendClassPath(TEST_CLASSES_FOLDER);
        }
        CtClass cc = pool.get("Jassist150$Inner1");
        CtMethod ccGet = cc.getDeclaredMethod("get");
        String code1 = "{ int n1 = Integer.valueOf(1); "
                + "  int n2 = Integer.valueOf(2); "
                + "  int n3 = Integer.valueOf(3); "
                + "  int n4 = Integer.valueOf(4); "
                + "  int n5 = Integer.valueOf(5); "
                + "  return n1+n2+n3+n4+n5; }";
        String code2 = "{ int n1 = java.lang.Integer.valueOf(1); "
                + "  int n2 = java.lang.Integer.valueOf(2); "
                + "  int n3 = java.lang.Integer.valueOf(3); "
                + "  int n4 = java.lang.Integer.valueOf(4); "
                + "  int n5 = java.lang.Integer.valueOf(5); "
                + "  return n1+n2+n3+n4+n5; }";
        String code3 = "{ int n1 = java.lang.Integer#valueOf(1); "
                + "  int n2 = java.lang.Integer#valueOf(2); "
                + "  int n3 = java.lang.Integer#valueOf(3); "
                + "  int n4 = java.lang.Integer#valueOf(4); "
                + "  int n5 = java.lang.Integer#valueOf(5); "
                + "  return n1+n2+n3+n4+n5; }";
        loop(cc, ccGet, code1);
    }

    public static void loop(CtClass cc, CtMethod ccGet, String code)
            throws CannotCompileException {
        long startTime = System.currentTimeMillis();
        for (int replace = 0; replace < 1000; replace++) {
            ccGet.setBody(code);
        }
        long endTime = System.currentTimeMillis();
        System.out.println("Test: Time (ms) " + (endTime - startTime));
    }

    public static void implTestClassTailCache2() throws NotFoundException,
            CannotCompileException {
        ClassPool pool = new ClassPool(true);
        for (int paths = 0; paths < 50; paths++) {
            pool.appendClassPath(JAVASSIST_JAR);
            pool.appendClassPath(CLASSES_FOLDER);
            pool.appendClassPath(TEST_CLASSES_FOLDER);
        }
        CtClass cc = pool.get("Jassist150$Inner1");
        CtMethod ccGet = cc.getDeclaredMethod("get");
        String code3 = "{ int n1 = java.lang.Integer#valueOf(1); "
                + "  int n2 = java.lang.Integer#valueOf(2); "
                + "  int n3 = java.lang.Integer#valueOf(3); "
                + "  int n4 = java.lang.Integer#valueOf(4); "
                + "  int n5 = java.lang.Integer#valueOf(5); "
                + "  return n1+n2+n3+n4+n5; }";
        ccGet.setBody(code3);
    }

    public void testJIRA152() throws Exception {
        CtClass cc = ClassPool.getDefault().get("test4.JIRA152");
        CtMethod mth = cc.getDeclaredMethod("buildColumnOverride");
        mth.instrument(new ExprEditor() {
            public void edit(MethodCall c) throws CannotCompileException {
                c.replace("try{ $_ = $proceed($$); } catch (Throwable t) { throw t; }");
            }
        });
        mth.getMethodInfo().rebuildStackMap(ClassPool.getDefault());
        cc.writeFile();
    }

    public static void main(String[] args) throws Exception {
        new Jassist150().testJIRA152();
    }

    public static void main2(String[] args) {
        for (int loop = 0; loop < 5; loop++) {
            try {
                implTestClassTailCache();
                for (int i = 0; i < 100; i++)
                    implTestClassTailCache2();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println("size: " + javassist.compiler.MemberResolver.getInvalidMapSize());
    }
}