src/test/java/com/android/tools/r8/rewrite/assertions/ChromuimAssertionHookMock.java

// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.rewrite.assertions;

import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class ChromuimAssertionHookMock {
  public static void assertFailureHandler(AssertionError assertion) {
    System.out.println("Got AssertionError " + assertion);
  }
}

/* Below is an asmified dump of the above class */

class ChromuimAssertionHookMockDump implements Opcodes {

  public static byte[] dump() {

    ClassWriter classWriter = new ClassWriter(0);
    MethodVisitor methodVisitor;

    classWriter.visit(
        V1_8,
        ACC_PUBLIC | ACC_SUPER,
        "com/android/tools/r8/rewrite/assertions/ChromuimAssertionHookMock",
        null,
        "java/lang/Object",
        null);

    classWriter.visitSource("ChromuimAssertionHookMock.java", null);

    {
      methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
      methodVisitor.visitCode();
      Label label0 = new Label();
      methodVisitor.visitLabel(label0);
      methodVisitor.visitLineNumber(7, label0);
      methodVisitor.visitVarInsn(ALOAD, 0);
      methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
      methodVisitor.visitInsn(RETURN);
      Label label1 = new Label();
      methodVisitor.visitLabel(label1);
      methodVisitor.visitLocalVariable(
          "this",
          "Lcom/android/tools/r8/rewrite/assertions/ChromuimAssertionHookMock;",
          null,
          label0,
          label1,
          0);
      methodVisitor.visitMaxs(1, 1);
      methodVisitor.visitEnd();
    }
    {
      methodVisitor =
          classWriter.visitMethod(
              ACC_PUBLIC | ACC_STATIC,
              "assertFailureHandler",
              "(Ljava/lang/AssertionError;)V",
              null,
              null);
      methodVisitor.visitCode();
      Label label0 = new Label();
      methodVisitor.visitLabel(label0);
      methodVisitor.visitLineNumber(9, label0);
      methodVisitor.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
      methodVisitor.visitTypeInsn(NEW, "java/lang/StringBuilder");
      methodVisitor.visitInsn(DUP);
      methodVisitor.visitMethodInsn(
          INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V", false);
      methodVisitor.visitLdcInsn("Got AssertionError ");
      methodVisitor.visitMethodInsn(
          INVOKEVIRTUAL,
          "java/lang/StringBuilder",
          "append",
          "(Ljava/lang/String;)Ljava/lang/StringBuilder;",
          false);
      methodVisitor.visitVarInsn(ALOAD, 0);
      methodVisitor.visitMethodInsn(
          INVOKEVIRTUAL,
          "java/lang/StringBuilder",
          "append",
          "(Ljava/lang/Object;)Ljava/lang/StringBuilder;",
          false);
      methodVisitor.visitMethodInsn(
          INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
      methodVisitor.visitMethodInsn(
          INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
      Label label1 = new Label();
      methodVisitor.visitLabel(label1);
      methodVisitor.visitLineNumber(10, label1);
      methodVisitor.visitInsn(RETURN);
      Label label2 = new Label();
      methodVisitor.visitLabel(label2);
      methodVisitor.visitLocalVariable(
          "assertion", "Ljava/lang/AssertionError;", null, label0, label2, 0);
      methodVisitor.visitMaxs(3, 1);
      methodVisitor.visitEnd();
    }
    classWriter.visitEnd();

    return classWriter.toByteArray();
  }
}