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diff --git a/asm/src/main/java/org/objectweb/asm/ModuleVisitor.java b/asm/src/main/java/org/objectweb/asm/ModuleVisitor.java
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+// ASM: a very small and fast Java bytecode manipulation framework
+// Copyright (c) 2000-2011 INRIA, France Telecom
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+// 3. Neither the name of the copyright holders nor the names of its
+//    contributors may be used to endorse or promote products derived from
+//    this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+// THE POSSIBILITY OF SUCH DAMAGE.
+package org.objectweb.asm;
+
+/**
+ * A visitor to visit a Java module. The methods of this class must be called in the following
+ * order: ( {@code visitMainClass} | ( {@code visitPackage} | {@code visitRequire} | {@code
+ * visitExport} | {@code visitOpen} | {@code visitUse} | {@code visitProvide} )* ) {@code visitEnd}.
+ *
+ * @author Remi Forax
+ * @author Eric Bruneton
+ */
+public abstract class ModuleVisitor {
+  /**
+   * The ASM API version implemented by this visitor. The value of this field must be one of {@link
+   * Opcodes#ASM6} or {@link Opcodes#ASM7}.
+   */
+  protected final int api;
+
+  /**
+   * The module visitor to which this visitor must delegate method calls. May be {@literal null}.
+   */
+  protected ModuleVisitor mv;
+
+  /**
+   * Constructs a new {@link ModuleVisitor}.
+   *
+   * @param api the ASM API version implemented by this visitor. Must be one of {@link Opcodes#ASM6}
+   *     or {@link Opcodes#ASM7}.
+   */
+  protected ModuleVisitor(final int api) {
+    this(api, null);
+  }
+
+  /**
+   * Constructs a new {@link ModuleVisitor}.
+   *
+   * @param api the ASM API version implemented by this visitor. Must be one of {@link Opcodes#ASM6}
+   *     or {@link Opcodes#ASM7}.
+   * @param moduleVisitor the module visitor to which this visitor must delegate method calls. May
+   *     be null.
+   */
+  protected ModuleVisitor(final int api, final ModuleVisitor moduleVisitor) {
+    if (api != Opcodes.ASM9
+        && api != Opcodes.ASM8
+        && api != Opcodes.ASM7
+        && api != Opcodes.ASM6
+        && api != Opcodes.ASM5
+        && api != Opcodes.ASM4
+        && api != Opcodes.ASM10_EXPERIMENTAL) {
+      throw new IllegalArgumentException("Unsupported api " + api);
+    }
+    if (api == Opcodes.ASM10_EXPERIMENTAL) {
+      Constants.checkAsmExperimental(this);
+    }
+    this.api = api;
+    this.mv = moduleVisitor;
+  }
+
+  /**
+   * The module visitor to which this visitor must delegate method calls. May be {@literal null}.
+   *
+   * @return the module visitor to which this visitor must delegate method calls, or {@literal
+   *     null}.
+   */
+  public ModuleVisitor getDelegate() {
+    return mv;
+  }
+
+  /**
+   * Visit the main class of the current module.
+   *
+   * @param mainClass the internal name of the main class of the current module (see {@link
+   *     Type#getInternalName()}).
+   */
+  public void visitMainClass(final String mainClass) {
+    if (mv != null) {
+      mv.visitMainClass(mainClass);
+    }
+  }
+
+  /**
+   * Visit a package of the current module.
+   *
+   * @param packaze the internal name of a package (see {@link Type#getInternalName()}).
+   */
+  public void visitPackage(final String packaze) {
+    if (mv != null) {
+      mv.visitPackage(packaze);
+    }
+  }
+
+  /**
+   * Visits a dependence of the current module.
+   *
+   * @param module the fully qualified name (using dots) of the dependence.
+   * @param access the access flag of the dependence among {@code ACC_TRANSITIVE}, {@code
+   *     ACC_STATIC_PHASE}, {@code ACC_SYNTHETIC} and {@code ACC_MANDATED}.
+   * @param version the module version at compile time, or {@literal null}.
+   */
+  public void visitRequire(final String module, final int access, final String version) {
+    if (mv != null) {
+      mv.visitRequire(module, access, version);
+    }
+  }
+
+  /**
+   * Visit an exported package of the current module.
+   *
+   * @param packaze the internal name of the exported package (see {@link Type#getInternalName()}).
+   * @param access the access flag of the exported package, valid values are among {@code
+   *     ACC_SYNTHETIC} and {@code ACC_MANDATED}.
+   * @param modules the fully qualified names (using dots) of the modules that can access the public
+   *     classes of the exported package, or {@literal null}.
+   */
+  public void visitExport(final String packaze, final int access, final String... modules) {
+    if (mv != null) {
+      mv.visitExport(packaze, access, modules);
+    }
+  }
+
+  /**
+   * Visit an open package of the current module.
+   *
+   * @param packaze the internal name of the opened package (see {@link Type#getInternalName()}).
+   * @param access the access flag of the opened package, valid values are among {@code
+   *     ACC_SYNTHETIC} and {@code ACC_MANDATED}.
+   * @param modules the fully qualified names (using dots) of the modules that can use deep
+   *     reflection to the classes of the open package, or {@literal null}.
+   */
+  public void visitOpen(final String packaze, final int access, final String... modules) {
+    if (mv != null) {
+      mv.visitOpen(packaze, access, modules);
+    }
+  }
+
+  /**
+   * Visit a service used by the current module. The name must be the internal name of an interface
+   * or a class.
+   *
+   * @param service the internal name of the service (see {@link Type#getInternalName()}).
+   */
+  public void visitUse(final String service) {
+    if (mv != null) {
+      mv.visitUse(service);
+    }
+  }
+
+  /**
+   * Visit an implementation of a service.
+   *
+   * @param service the internal name of the service (see {@link Type#getInternalName()}).
+   * @param providers the internal names (see {@link Type#getInternalName()}) of the implementations
+   *     of the service (there is at least one provider).
+   */
+  public void visitProvide(final String service, final String... providers) {
+    if (mv != null) {
+      mv.visitProvide(service, providers);
+    }
+  }
+
+  /**
+   * Visits the end of the module. This method, which is the last one to be called, is used to
+   * inform the visitor that everything have been visited.
+   */
+  public void visitEnd() {
+    if (mv != null) {
+      mv.visitEnd();
+    }
+  }
+}