SharedLibLoader.java: New class.

	* gnu/gcj/runtime/SharedLibLoader.java:  New class.
	* gnu/gcj/runtime/natSharedLibLoader.cc:  Native methods.
	* Makefile.am:  Update accordingly.
	* configure.in:  Add AC_CHECK_LIB for dlopen.
	* include/config.h.in:  Add HAVE_DLOPEN.

From-SVN: r45885

1 files changed, 75 insertions, 0 deletions

diff --git a/libjava/gnu/gcj/runtime/SharedLibLoader.java b/libjava/gnu/gcj/runtime/SharedLibLoader.java
new file mode 100644
index 00000000000..ac2f72d4b64
--- /dev/null
+++ b/libjava/gnu/gcj/runtime/SharedLibLoader.java
@@ -0,0 +1,75 @@
+/* Copyright (C) 2001  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package gnu.gcj.runtime;
+import java.util.Hashtable;
+
+/**
+ * A ClassLoader backed by a gcj-compiled shared library.
+ * @author Per Bothner <per@bothner.com>, Brainfood Inc.
+ */
+
+public class SharedLibLoader extends ClassLoader
+{
+  public native void finalize ();
+
+  /** Called during dlopen's processing of the init section. */
+  void registerClass(String name, Class cls)
+  {
+    classMap.put(name, cls);
+  }
+
+  /** Load a shared library, and associate a ClassLoader with it.
+   * @param libname named of shared library (passed to dlopen)
+   * @param parent the parent ClassLoader
+   * @parem flags passed to dlopen
+   */
+  public SharedLibLoader(String libname, ClassLoader parent, int flags)
+  {
+    super(parent);
+    init(libname, flags);
+  }
+
+
+  /** Load a shared library, and asociate a ClassLoader with it.
+   * @param libname named of shared library (passed to dlopen)
+   */
+  public SharedLibLoader(String libname)
+  {
+    super(getSystemClassLoader());
+    init(libname, 0);
+  }
+
+  void init(String libname, int flags)
+  {
+    init(libname.getBytes(), flags);
+  }
+
+  native void init(byte[] libname, int flags);
+
+  public Class loadClass(String name)
+    throws ClassNotFoundException
+  {
+    return super.loadClass(name);
+  }
+
+  public Class findClass(String name)
+    throws ClassNotFoundException
+  {
+    Object cls = classMap.get(name);
+    if (cls == null)
+      throw new ClassNotFoundException(name);
+    return (Class) cls;
+  }
+
+  /** The handle returned by dlopen. */
+  gnu.gcj.RawData handler;
+
+  /** Map classnames to Classes. */
+  Hashtable classMap = new Hashtable(20);
+}