content: /*
   * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.classfile;
  
  import java.io.IOException;
  
  /**
   * See JVMS 4.7.21
   * https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.21
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public class BootstrapMethods_attribute extends Attribute {
      public final BootstrapMethodSpecifier[] bootstrap_method_specifiers;
  
      BootstrapMethods_attribute(ClassReader cr, int name_index, int length)
              throws IOException, AttributeException {
          super(name_index, length);
          int bootstrap_method_count = cr.readUnsignedShort();
          bootstrap_method_specifiers = new BootstrapMethodSpecifier[bootstrap_method_count];
          for (int i = 0; i < bootstrap_method_specifiers.length; i++)
              bootstrap_method_specifiers[i] = new BootstrapMethodSpecifier(cr);
      }
  
      public  BootstrapMethods_attribute(int name_index, BootstrapMethodSpecifier[] bootstrap_method_specifiers) {
          super(name_index, length(bootstrap_method_specifiers));
          this.bootstrap_method_specifiers = bootstrap_method_specifiers;
      }
  
      public static int length(BootstrapMethodSpecifier[] bootstrap_method_specifiers) {
          int n = 2;
          for (BootstrapMethodSpecifier b : bootstrap_method_specifiers)
              n += b.length();
          return n;
      }
  
      @Override
      public <R, P> R accept(Visitor<R, P> visitor, P p) {
          return visitor.visitBootstrapMethods(this, p);
      }
  
      public static class BootstrapMethodSpecifier {
          public int bootstrap_method_ref;
          public int[] bootstrap_arguments;
  
          public BootstrapMethodSpecifier(int bootstrap_method_ref, int[] bootstrap_arguments) {
              this.bootstrap_method_ref = bootstrap_method_ref;
              this.bootstrap_arguments = bootstrap_arguments;
          }
          BootstrapMethodSpecifier(ClassReader cr) throws IOException {
              bootstrap_method_ref = cr.readUnsignedShort();
              int method_count = cr.readUnsignedShort();
              bootstrap_arguments = new int[method_count];
              for (int i = 0; i < bootstrap_arguments.length; i++) {
                  bootstrap_arguments[i] = cr.readUnsignedShort();
              }
          }
  
          int length() {
              // u2 (method_ref) + u2 (argc) + u2 * argc
              return 2 + 2 + (bootstrap_arguments.length * 2);
          }
      }
  }
  