natvmclassloader.cc

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// Native code for VMClassLoader

/* Copyright (C) 2002  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.  */

#include <config.h>

#include <gcj/cni.h>
#include <jvm.h>

#include <gnu/gcj/runtime/VMClassLoader.h>
#include <java/lang/Class.h>
#include <java/lang/StringBuffer.h>
#include <java/net/URLClassLoader.h>
#include <java/lang/Runtime.h>

jclass
gnu::gcj::runtime::VMClassLoader::findClass (jstring name)
{
  _Jv_Utf8Const *name_u = _Jv_makeUtf8Const (name);
  jclass klass = _Jv_FindClassInCache (name_u, 0);

  if (! klass)
    {
      // Turn `gnu.pkg.quux' into `lib-gnu-pkg-quux'.  Then search for
      // a module named (eg, on Linux) `lib-gnu-pkg-quux.so', followed
      // by `lib-gnu-pkg.so' and `lib-gnu.so'.  If loading one of
      // these causes the class to appear in the cache, then use it.
      java::lang::StringBuffer *sb = new java::lang::StringBuffer (JvNewStringLatin1("lib-"));
      // Skip inner classes
      jstring cn;
      jint ci = name->indexOf('$');
      if (ci == -1)
	cn = name;
      else
	cn = name->substring (0, ci);
      jstring so_base_name = (sb->append (cn)->toString ())->replace ('.', '-');

      // Compare against `3' because that is the length of "lib".
      while (! klass && so_base_name && so_base_name->length() > 3)
	{
	  using namespace ::java::lang;
	  Runtime *rt = Runtime::getRuntime();
	  jboolean loaded = rt->loadLibraryInternal (so_base_name);

	  jint nd = so_base_name->lastIndexOf ('-');
	  if (nd == -1)
	    so_base_name = NULL;
	  else
	    so_base_name = so_base_name->substring (0, nd);

	  if (loaded)
	    klass = _Jv_FindClassInCache (name_u, 0);
	}
    }

  // Now try loading using the interpreter.
  if (! klass)
    klass = java::net::URLClassLoader::findClass (name);

  return klass;
}