// natSystem.cc - Native code implementing System class.

/* Copyright (C) 1998, 1999, 2000, 2001 , 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 <stdio.h>
#include <string.h>
#include <stdlib.h>

#include <gcj/cni.h>
#include <jvm.h>
#include <java/lang/System.h>
#include <java/lang/Class.h>
#include <java/lang/ArrayStoreException.h>
#include <java/lang/ArrayIndexOutOfBoundsException.h>
#include <java/lang/NullPointerException.h>
#include <java/io/PrintStream.h>
#include <java/io/InputStream.h>

#include "platform.h"



void
java::lang::System::setErr0 (java::io::PrintStream *newErr)
{
  err = newErr;
}

void
java::lang::System::setIn0 (java::io::InputStream *newIn)
{
  in = newIn;
}

void
java::lang::System::setOut0 (java::io::PrintStream *newOut)
{
  out = newOut;
}

void
java::lang::System::arraycopy (jobject src, jint src_offset,
			       jobject dst, jint dst_offset,
			       jint count)
{
  if (! src || ! dst)
    throw new NullPointerException;

  jclass src_c = src->getClass();
  jclass dst_c = dst->getClass();
  jclass src_comp = src_c->getComponentType();
  jclass dst_comp = dst_c->getComponentType();

  if (! src_c->isArray() || ! dst_c->isArray()
      || src_comp->isPrimitive() != dst_comp->isPrimitive()
      || (src_comp->isPrimitive() && src_comp != dst_comp))
    throw new ArrayStoreException;

  __JArray *src_a = (__JArray *) src;
  __JArray *dst_a = (__JArray *) dst;
  if (src_offset < 0 || dst_offset < 0 || count < 0
      || src_offset + count > src_a->length
      || dst_offset + count > dst_a->length)
    throw new ArrayIndexOutOfBoundsException;

  // Do-nothing cases.
  if ((src == dst && src_offset == dst_offset)
      || ! count)
    return;

  // If both are primitive, we can optimize trivially.  If DST
  // components are always assignable from SRC components, then we
  // will never need to raise an error, and thus can do the
  // optimization.  If source and destinations are the same, then we
  // know that the assignability premise always holds.
  const bool prim = src_comp->isPrimitive();
  if (prim || dst_comp->isAssignableFrom(src_comp) || src == dst)
    {
      const size_t size = (prim ? src_comp->size()
			   : sizeof elements((jobjectArray)src)[0]);

      char *src_elts = _Jv_GetArrayElementFromElementType (src, src_comp);
      src_elts += size * src_offset;

      char *dst_elts = _Jv_GetArrayElementFromElementType (dst, dst_comp);
      dst_elts += size * dst_offset;

#if HAVE_MEMMOVE
      // We don't bother trying memcpy.  It can't be worth the cost of
      // the check.
      // Don't cast to (void*), as memmove may expect (char*)
      memmove (dst_elts, src_elts, count * size);
#else
      bcopy (src_elts, dst_elts, count * size);
#endif
    }
  else
    {
      jobject *src_elts = elements ((jobjectArray) src_a) + src_offset;
      jobject *dst_elts = elements ((jobjectArray) dst_a) + dst_offset;

      for (int i = 0; i < count; ++i)
	{
	  if (*src_elts
	      && ! dst_comp->isAssignableFrom((*src_elts)->getClass()))
	    throw new ArrayStoreException;
	  *dst_elts++ = *src_elts++;
	}
    }
}

jlong
java::lang::System::currentTimeMillis (void)
{
  return _Jv_platform_gettimeofday ();
}

jint
java::lang::System::identityHashCode (jobject obj)
{
  return _Jv_HashCode (obj);
}

jboolean
java::lang::System::isWordsBigEndian (void)
{
  union
  {
    long lval;
    char cval;
  } u;

  u.lval = 1;
  return u.cval == 0;
}