content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import static art.Redefinition.doCommonClassRedefinition;
  
  import java.util.Base64;
  import java.util.function.Consumer;
  import java.lang.reflect.Method;
  
  public class Main {
  
    // import java.util.function.Consumer;
    // class Transform {
    //   public void sayHi(int recur, Consumer<String> reporter, Runnable r) {
    //     reporter.accept("Hello" + recur + " - transformed");
    //     if (recur == 1) {
    //       r.run();
    //       sayHi(recur - 1, reporter, r);
    //     } else if (recur != 0) {
    //       sayHi(recur - 1, reporter, r);
    //     }
    //     reporter.accept("Goodbye" + recur + " - transformed");
    //   }
    // }
    private static final byte[] CLASS_BYTES = Base64.getDecoder().decode(
      "yv66vgAAADQAMwoADgAaBwAbCgACABoIABwKAAIAHQoAAgAeCAAfCgACACALACEAIgsAIwAkCgAN" +
      "ACUIACYHACcHACgBAAY8aW5pdD4BAAMoKVYBAARDb2RlAQAPTGluZU51bWJlclRhYmxlAQAFc2F5" +
      "SGkBADUoSUxqYXZhL3V0aWwvZnVuY3Rpb24vQ29uc3VtZXI7TGphdmEvbGFuZy9SdW5uYWJsZTsp" +
      "VgEADVN0YWNrTWFwVGFibGUBAAlTaWduYXR1cmUBAEkoSUxqYXZhL3V0aWwvZnVuY3Rpb24vQ29u" +
      "c3VtZXI8TGphdmEvbGFuZy9TdHJpbmc7PjtMamF2YS9sYW5nL1J1bm5hYmxlOylWAQAKU291cmNl" +
      "RmlsZQEADlRyYW5zZm9ybS5qYXZhDAAPABABABdqYXZhL2xhbmcvU3RyaW5nQnVpbGRlcgEABUhl" +
      "bGxvDAApACoMACkAKwEADiAtIHRyYW5zZm9ybWVkDAAsAC0HAC4MAC8AMAcAMQwAMgAQDAATABQB" +
      "AAdHb29kYnllAQAJVHJhbnNmb3JtAQAQamF2YS9sYW5nL09iamVjdAEABmFwcGVuZAEALShMamF2" +
      "YS9sYW5nL1N0cmluZzspTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwEAHChJKUxqYXZhL2xhbmcv" +
      "U3RyaW5nQnVpbGRlcjsBAAh0b1N0cmluZwEAFCgpTGphdmEvbGFuZy9TdHJpbmc7AQAbamF2YS91" +
      "dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAQAGYWNjZXB0AQAVKExqYXZhL2xhbmcvT2JqZWN0OylWAQAS" +
      "amF2YS9sYW5nL1J1bm5hYmxlAQADcnVuACAADQAOAAAAAAACAAAADwAQAAEAEQAAAB0AAQABAAAA" +
      "BSq3AAGxAAAAAQASAAAABgABAAAAAgABABMAFAACABEAAACfAAQABAAAAGEsuwACWbcAAxIEtgAF" +
      "G7YABhIHtgAFtgAIuQAJAgAbBKAAFS25AAoBACobBGQsLbYAC6cAEBuZAAwqGwRkLC22AAssuwAC" +
      "WbcAAxIMtgAFG7YABhIHtgAFtgAIuQAJAgCxAAAAAgASAAAAIgAIAAAABAAeAAUAIwAGACkABwA1" +
      "AAgAOQAJAEIACwBgAAwAFQAAAAQAAjUMABYAAAACABcAAQAYAAAAAgAZ");
    private static final byte[] DEX_BYTES = Base64.getDecoder().decode(
      "ZGV4CjAzNQA7uevryhDgvad3G3EACTdspZGfNKv2i3kkBQAAcAAAAHhWNBIAAAAAAAAAAGwEAAAf" +
      "AAAAcAAAAAkAAADsAAAABgAAABABAAAAAAAAAAAAAAkAAABYAQAAAQAAAKABAABkAwAAwAEAAMoC" +
      "AADaAgAA3gIAAOICAADlAgAA7QIAAPECAAD6AgAAAQMAAAQDAAAHAwAACwMAAA8DAAAcAwAAOwMA" +
      "AE8DAABlAwAAeQMAAJQDAACyAwAA0QMAAOEDAADkAwAA6gMAAO4DAAD2AwAA/gMAABIEAAAXBAAA" +
      "HgQAACgEAAAIAAAADAAAAA0AAAAOAAAADwAAABAAAAARAAAAEwAAABUAAAAJAAAABQAAAAAAAAAK" +
      "AAAABgAAAKgCAAALAAAABgAAALACAAAVAAAACAAAAAAAAAAWAAAACAAAALgCAAAXAAAACAAAAMQC" +
      "AAABAAMABAAAAAEABAAcAAAAAwADAAQAAAAEAAMAGwAAAAYAAwAEAAAABgABABkAAAAGAAIAGQAA" +
      "AAYAAAAdAAAABwAFABgAAAABAAAAAAAAAAMAAAAAAAAAFAAAAJACAABbBAAAAAAAAAEAAABHBAAA" +
      "AQABAAEAAAAvBAAABAAAAHAQAgAAAA4ABgAEAAQAAAA0BAAAUAAAACIABgBwEAQAAAAbAQcAAABu" +
      "IAYAEAAMAG4gBQAwAAwAGwEAAAAAbiAGABAADABuEAcAAAAMAHIgCAAEABIQMwMpAHIQAwAFANgA" +
      "A/9uQAEAAlQiAAYAcBAEAAAAGwEGAAAAbiAGABAADABuIAUAMAAMABsBAAAAAG4gBgAQAAwAbhAH" +
      "AAAADAByIAgABAAOADgD4f/YAAP/bkABAAJUKNoAAAAAAAAAAAEAAAAAAAAAAQAAAMABAAABAAAA" +
      "AAAAAAEAAAAFAAAAAwAAAAAABwAEAAAAAQAAAAMADiAtIHRyYW5zZm9ybWVkAAIoSQACKVYAATwA" +
      "Bjxpbml0PgACPjsAB0dvb2RieWUABUhlbGxvAAFJAAFMAAJMSQACTEwAC0xUcmFuc2Zvcm07AB1M" +
      "ZGFsdmlrL2Fubm90YXRpb24vU2lnbmF0dXJlOwASTGphdmEvbGFuZy9PYmplY3Q7ABRMamF2YS9s" +
      "YW5nL1J1bm5hYmxlOwASTGphdmEvbGFuZy9TdHJpbmc7ABlMamF2YS9sYW5nL1N0cmluZ0J1aWxk" +
      "ZXI7ABxMamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAB1MamF2YS91dGlsL2Z1bmN0aW9uL0Nv" +
      "bnN1bWVyOwAOVHJhbnNmb3JtLmphdmEAAVYABFZJTEwAAlZMAAZhY2NlcHQABmFwcGVuZAASZW1p" +
      "dHRlcjogamFjay00LjI0AANydW4ABXNheUhpAAh0b1N0cmluZwAFdmFsdWUAAgAHDgAEAwAAAAcO" +
      "AR4PPDxdAR4PGS0AAgIBHhwHFwEXEhcDFxAXBRcPFwIAAAEBAICABMgDAQHgAwAAAA8AAAAAAAAA" +
      "AQAAAAAAAAABAAAAHwAAAHAAAAACAAAACQAAAOwAAAADAAAABgAAABABAAAFAAAACQAAAFgBAAAG" +
      "AAAAAQAAAKABAAADEAAAAQAAAMABAAABIAAAAgAAAMgBAAAGIAAAAQAAAJACAAABEAAABAAAAKgC" +
      "AAACIAAAHwAAAMoCAAADIAAAAgAAAC8EAAAEIAAAAQAAAEcEAAAAIAAAAQAAAFsEAAAAEAAAAQAA" +
      "AGwEAAA=");
  
    // A class that we can use to keep track of the output of this test.
    private static class TestWatcher implements Consumer<String> {
      private StringBuilder sb;
      public TestWatcher() {
        sb = new StringBuilder();
      }
  
      @Override
      public void accept(String s) {
        sb.append(s);
        sb.append('\n');
      }
  
      public String getOutput() {
        return sb.toString();
      }
  
      public void clear() {
        sb = new StringBuilder();
      }
    }
  
    public static void main(String[] args) {
      doTest(new Transform());
    }
  
    private static boolean retry = false;
  
    public static void doTest(Transform t) {
      final TestWatcher reporter = new TestWatcher();
      Method say_hi_method;
      // Figure out if we can even JIT at all.
      final boolean has_jit = hasJit();
      try {
        say_hi_method = Transform.class.getDeclaredMethod(
            "sayHi", int.class, Consumer.class, Runnable.class);
      } catch (Exception e) {
        System.out.println("Unable to find methods!");
        e.printStackTrace();
        return;
      }
      // Makes sure the stack is the way we want it for the test and does the redefinition. It will
      // set the retry boolean to true if we need to go around again due to jit code being GCd.
      Runnable do_redefinition = () -> {
        if (has_jit && Main.isInterpretedFunction(say_hi_method, true)) {
          // Try again. We are not running the right jitted methods/cannot redefine them now.
          retry = true;
        } else {
          // Actually do the redefinition. The stack looks good.
          retry = false;
          reporter.accept("transforming calling function");
          doCommonClassRedefinition(Transform.class, CLASS_BYTES, DEX_BYTES);
        }
      };
      do {
        // Run ensureJitCompiled here since it might get GCd
        ensureJitCompiled(Transform.class, "sayHi");
        // Clear output.
        reporter.clear();
        t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
        t.sayHi(2, reporter, do_redefinition);
        t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
      } while(retry);
      System.out.println(reporter.getOutput());
    }
  
    private static native boolean hasJit();
  
    private static native boolean isInterpretedFunction(Method m, boolean require_deoptimizable);
  
    private static native void ensureJitCompiled(Class c, String name);
  }
  