1 files changed, 144 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/runtime/SharedLibHelper.java b/libjava/gnu/gcj/runtime/SharedLibHelper.java
new file mode 100644
index 00000000000..9e170a120be
--- /dev/null
+++ b/libjava/gnu/gcj/runtime/SharedLibHelper.java
@@ -0,0 +1,144 @@
+/* Copyright (C) 2001, 2003  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.lang.ref.WeakReference;
+import java.net.URL;
+import java.net.MalformedURLException;
+import java.util.HashMap;
+import java.security.*;
+import gnu.gcj.Core;
+
+public class SharedLibHelper
+{
+  /** 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
+   */
+  SharedLibHelper(String libname, ClassLoader parent, CodeSource source,
+		  int flags)
+  {
+    // FIXME: ask security manager first.
+    loader = parent;
+    baseName = libname;
+    domain = new ProtectionDomain(source,
+				  Policy.getPolicy().getPermissions(source));
+    this.flags = flags;
+  }
+
+  public static SharedLibHelper findHelper (String libname)
+  {
+    synchronized (map)
+      {
+	WeakReference ref = (WeakReference) map.get(libname);
+	if (ref != null)
+	  return (SharedLibHelper) ref.get();
+	return null;
+      }
+  }
+
+  public static SharedLibHelper findHelper (ClassLoader loader, String libname,
+					    CodeSource source)
+  {
+    synchronized (map)
+      {
+	SharedLibHelper result;
+	WeakReference ref = (WeakReference) map.get(libname);
+	if (ref != null)
+	  {
+	    result = (SharedLibHelper) ref.get();
+	    if (result != null)
+	      {
+		if (result.loader != loader)
+		  // FIXME
+		  throw new UnknownError();
+		return result;
+	      }
+	  }
+
+	result = new SharedLibHelper(libname, loader, source, 0);
+	map.put(libname, new WeakReference(result));
+	return result;
+      }
+  }
+
+  public native void finalize ();
+
+  public Class findClass(String name)
+  {
+    ensureInit();
+    return (Class) classMap.get(name);
+  }
+
+  public URL findResource (String name)
+  {
+    ensureInit();
+    if (! hasResource(name))
+      return null;
+    try
+      {
+	return new URL("gcjlib", "", -1, baseName + "!/" + name);
+      }
+    catch (MalformedURLException _)
+      {
+      }
+    return null;
+  }
+
+  public native Core findCore (String name);
+
+  void ensureInit()
+  {
+    synchronized (classMap)
+      {
+	if (initialized)
+	  return;
+	init();
+	initialized = true;
+      }
+  }
+
+  native boolean hasResource(String name);
+  native void init();
+
+  /** Called during dlopen's processing of the init section. */
+  void registerClass(String name, Class cls)
+  {
+    classMap.put(name, cls);
+  }
+
+  /** The handle returned by dlopen. */
+  gnu.gcj.RawData handler;
+
+  /** Holds a _Jv_core_chain for the loader.  */
+  gnu.gcj.RawData core_chain;
+
+  /** Map classnames to Classes. */
+  HashMap classMap = new HashMap(20);
+
+  /** Class loader we're helping.  */
+  ClassLoader loader;
+
+  /** Name of base file.  */
+  String baseName;
+
+  /** Protection domain for loaded classes.  */
+  ProtectionDomain domain;
+
+  /** Flags to pass to dlopen.  FIXME: platform dependent.
+      0 is always "sensible" (defined by us).  */
+  int flags;
+
+  /** True if we've been initialized.  */
+  boolean initialized = false;
+
+  /** Map shared library names to a helper object.  This uses weak
+      references in the values so we don't prevent collection.  */
+  static HashMap map = new HashMap ();
+}