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// natRuntime.cc - Implementation of native side of Runtime class.

/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006  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 <platform.h>

#include <stdlib.h>

#include <gcj/cni.h>

#include <jvm.h>

#include <java-props.h>

#include <java-stack.h>

#include <java/lang/Long.h>

#include <java/lang/Runtime.h>

#include <java/lang/UnknownError.h>

#include <java/lang/UnsatisfiedLinkError.h>

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

#include <java/io/File.h>

#include <java/util/TimeZone.h>

#include <java/lang/StringBuffer.h>

#include <java/lang/Process.h>

#include <java/lang/ConcreteProcess.h>

#include <java/lang/ClassLoader.h>

#include <jni.h>

#ifdef HAVE_PWD_H

#include <pwd.h>

#endif

#include <errno.h>

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#ifdef HAVE_LANGINFO_H

#include <langinfo.h>

#endif

#ifdef USE_LTDL

#include <ltdl.h>

/* FIXME: we don't always need this.  The next libtool will let us use

   AC_LTDL_PREOPEN to see if we do.  */

extern const lt_dlsymlist lt_preloaded_symbols[1] = { { 0, 0 } };

struct lookup_data

{

  const char *symname;

  void *result;

};

static int

find_symbol (lt_dlhandle handle, lt_ptr data)

{

  lookup_data *ld = (lookup_data *) data;

  ld->result = lt_dlsym (handle, ld->symname);

  return ld->result != NULL;

}

void *

_Jv_FindSymbolInExecutable (const char *symname)

{

  lookup_data data;

  data.symname = symname;

  data.result = NULL;

  lt_dlforeach (find_symbol, (lt_ptr) &data);

  return data.result;

}

#else

void *

_Jv_FindSymbolInExecutable (const char *)

{

  return NULL;

}

#endif /* USE_LTDL */

void

java::lang::Runtime::runFinalizationForExit ()

{

  if (finalizeOnExit)

    _Jv_RunAllFinalizers ();

}

void

java::lang::Runtime::exitInternal (jint status)

{

  // Make status right for Unix.  This is perhaps strange.

  if (status < 0 || status > 255)

    status = 255;

  ::exit (status);

}

jlong

java::lang::Runtime::freeMemory (void)

{

  return _Jv_GCFreeMemory ();

}

void

java::lang::Runtime::gc (void)

{

  _Jv_RunGC ();

}

#ifdef USE_LTDL

// List of names for JNI_OnLoad.

static const char *onload_names[] = _Jv_platform_onload_names;

#endif

void

java::lang::Runtime::_load (jstring path, jboolean do_search)

{

  JvSynchronize sync (this);

  using namespace java::lang;

#ifdef USE_LTDL

  jint len = _Jv_GetStringUTFLength (path);

  char buf[len + 1 + strlen (_Jv_platform_solib_prefix)

           + strlen (_Jv_platform_solib_suffix)];

  int offset = 0;

  if (do_search)

    {

      strcpy (buf, _Jv_platform_solib_prefix);

      offset = strlen (_Jv_platform_solib_prefix);

    }

  jsize total = JvGetStringUTFRegion (path, 0, path->length(), &buf[offset]);

  buf[offset + total] = '\0';

  char *lib_name = buf;

  if (do_search)

    {

      ClassLoader *look = _Jv_StackTrace::GetFirstNonSystemClassLoader ();

      if (look != NULL)

        {

          // Don't include solib prefix in string passed to

          // findLibrary.

          jstring name = look->findLibrary(JvNewStringUTF(&buf[offset]));

          if (name != NULL)

            {

              len = _Jv_GetStringUTFLength (name);

              lib_name = (char *) _Jv_AllocBytes(len + 1);

              total = JvGetStringUTFRegion (name, 0,

                                            name->length(), lib_name);

              lib_name[total] = '\0';

              // Don't append suffixes any more; we have the full file

              // name.

              do_search = false;

            }

        }

    }

  lt_dlhandle h;

  // FIXME: make sure path is absolute.

  {

    // Synchronize on java.lang.Class. This is to protect the class chain from

    // concurrent modification by class registration calls which may be run

    // during the dlopen().

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

    h = do_search ? lt_dlopenext (lib_name) : lt_dlopen (lib_name);

  }

  if (h == NULL)

    {

      const char *msg = lt_dlerror ();

      jstring str = JvNewStringLatin1 (lib_name);

      str = str->concat (JvNewStringLatin1 (": "));

      str = str->concat (JvNewStringLatin1 (msg));

      throw new UnsatisfiedLinkError (str);

    }

  // Search for JNI_OnLoad function.

  void *onload = NULL;

  const char **name = onload_names;

  while (*name != NULL)

    {

      onload = lt_dlsym (h, *name);

      if (onload != NULL)

        break;

      ++name;

    }

  if (onload != NULL)

    {

      JavaVM *vm = _Jv_GetJavaVM ();

      if (vm == NULL)

        {

          // FIXME: what?

          return;

        }

      jint vers = ((jint (JNICALL *) (JavaVM *, void *)) onload) (vm, NULL);

      if (vers != JNI_VERSION_1_1 && vers != JNI_VERSION_1_2

          && vers != JNI_VERSION_1_4)

        {

          // FIXME: unload the library.

          throw new UnsatisfiedLinkError (JvNewStringLatin1 ("unrecognized version from JNI_OnLoad"));

        }

    }

#else

  throw new UnknownError

    (JvNewStringLatin1 (do_search

                        ? "Runtime.loadLibrary not implemented"

                        : "Runtime.load not implemented"));

#endif /* USE_LTDL */

}

jboolean

java::lang::Runtime::loadLibraryInternal (jstring lib)

{

  JvSynchronize sync (this);

  using namespace java::lang;

#ifdef USE_LTDL

  jint len = _Jv_GetStringUTFLength (lib);

  char buf[len + 1];

  jsize total = JvGetStringUTFRegion (lib, 0, lib->length(), buf);

  buf[total] = '\0';

  // FIXME: make sure path is absolute.

  lt_dlhandle h = lt_dlopenext (buf);

  return h != NULL;

#else

  return false;

#endif /* USE_LTDL */

}

void

java::lang::Runtime::init (void)

{

#ifdef USE_LTDL

  lt_dlinit ();

  // Set module load path.

  lt_dlsetsearchpath (_Jv_Module_Load_Path);

  // Make sure self is opened.

  lt_dlopen (NULL);

#endif

}

void

java::lang::Runtime::runFinalization (void)

{

  gnu::gcj::runtime::FinalizerThread::finalizerReady ();

}

jlong

java::lang::Runtime::totalMemory (void)

{

  return _Jv_GCTotalMemory ();

}

jlong

java::lang::Runtime::maxMemory (void)

{

  // We don't have a maximum.  FIXME: we might if we ask the GC for

  // one.

  return Long::MAX_VALUE;

}

void

java::lang::Runtime::traceInstructions (jboolean)

{

  // Do nothing.

}

void

java::lang::Runtime::traceMethodCalls (jboolean)

{

  // Do nothing.

}

java::lang::Process *

java::lang::Runtime::execInternal (jstringArray cmd,

                                   jstringArray env,

                                   java::io::File *dir)

{

  return new java::lang::ConcreteProcess (cmd, env, dir);

}

jint

java::lang::Runtime::availableProcessors (void)

{

  // FIXME: find the real value.

  return 1;

}

jstring

java::lang::Runtime::nativeGetLibname (jstring pathname, jstring libname)

{

  java::lang::StringBuffer *sb = new java::lang::StringBuffer ();

  sb->append(pathname);

  if (pathname->length() > 0)

    sb->append (_Jv_platform_file_separator);

  sb->append (JvNewStringLatin1 (_Jv_platform_solib_prefix));

  sb->append(libname);

  sb->append (JvNewStringLatin1 (_Jv_platform_solib_suffix));

  return sb->toString();

}