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// natSharedLibLoader.cc - Implementation of SharedLibHelper native methods.

/* Copyright (C) 2001, 2003, 2004, 2005  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>

// If we're using the Boehm GC, then we need this include to override dlopen.

#ifdef HAVE_BOEHM_GC

#include <gc.h>

#endif /* HAVE_BOEHM_GC */

#include <gcj/cni.h>

#include <jvm.h>

#include <execution.h>

#include <gnu/gcj/runtime/SharedLibHelper.h>

#include <java/io/IOException.h>

#include <java/lang/UnsupportedOperationException.h>

#include <java/lang/UnknownError.h>

#ifdef HAVE_DLOPEN

#include <dlfcn.h>

/* Only used during dlopen, while having a lock on Class.class. */

static java::lang::ClassLoader *curLoader;

static gnu::gcj::runtime::SharedLibHelper *curHelper;

typedef void (*ClassHookFunc) (jclass);

typedef void (*CoreHookFunc) (_Jv_core_chain *);

void

_Jv_sharedlib_register_hook (jclass cls)

{

  cls->protectionDomain = curHelper->domain;

  cls->loader = curLoader;

  cls->engine = &_Jv_soleCompiledEngine;

  curHelper->registerClass(cls->getName(), cls);

}

static void

core_hook (_Jv_core_chain *chain)

{

  chain->next = (_Jv_core_chain *) curHelper->core_chain;

  curHelper->core_chain = (gnu::gcj::RawData *) chain;

}

struct SharedLibDummy

{

  ClassHookFunc saved;

  CoreHookFunc saved_core;

  SharedLibDummy()

  {

    saved = _Jv_RegisterClassHook;

    saved_core = _Jv_RegisterCoreHook;

  }

  ~SharedLibDummy()

  {

    _Jv_RegisterClassHook = saved;

    _Jv_RegisterCoreHook = saved_core;

    curLoader = NULL;

  }

};

#endif

void

gnu::gcj::runtime::SharedLibHelper::init(void)

{

#ifdef HAVE_DLOPEN

  char *lname = (char *) __builtin_alloca (JvGetStringUTFLength (baseName)

                                           + 1);

  jsize total = JvGetStringUTFRegion (baseName, 0, baseName->length(), lname);

  lname[total] = '\0';

  if (flags==0)

    flags = RTLD_GLOBAL | RTLD_LAZY;

  JvSynchronize dummy1(&java::lang::Class::class$);

  SharedLibDummy dummy2;

  curLoader = loader;

  curHelper = this;

  _Jv_RegisterClassHook = _Jv_sharedlib_register_hook;

  _Jv_RegisterCoreHook = core_hook;

  void *h = dlopen(lname, flags);

  if (h == NULL)

    {

      const char *msg = dlerror();

      throw new java::lang::UnknownError(JvNewStringLatin1(msg));

    }

  handler = (gnu::gcj::RawData*) h;

#else

  const char *msg

    = "shared library class loading is not supported on this platform";

  throw new java::lang::UnsupportedOperationException(JvNewStringLatin1(msg));

#endif

}

jboolean

gnu::gcj::runtime::SharedLibHelper::hasResource (jstring name)

{

#ifdef HAVE_DLOPEN

  _Jv_core_chain *node = _Jv_FindCore ((_Jv_core_chain *) core_chain, name);

  return node != NULL;

#else

  return false;

#endif

}

gnu::gcj::Core *

gnu::gcj::runtime::SharedLibHelper::findCore (jstring name)

{

#ifdef HAVE_DLOPEN

  extern gnu::gcj::Core *_Jv_create_core (_Jv_core_chain *node, jstring name);

  ensureInit();

  return _Jv_create_core ((_Jv_core_chain *) core_chain, name);

#else

  return NULL;

#endif

}

void

gnu::gcj::runtime::SharedLibHelper::finalize()

{

  _Jv_FreeCoreChain ((_Jv_core_chain *) core_chain);

#ifdef HAVE_DLOPEN

  if (handler)

    dlclose (handler);

#endif

}

void

gnu::gcj::runtime::SharedLibHelper::ensureSupersLinked(jclass k)

{

  _Jv_Linker::wait_for_state (k, JV_STATE_LOADING);

}