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// field.h - Header file for fieldID instances.  -*- c++ -*-

/* Copyright (C) 1998, 1999, 2000, 2004  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.  */

#ifndef __GCJ_FIELD_H__

#define __GCJ_FIELD_H__

#include <java/lang/Class.h>

#include <java/lang/reflect/Field.h>

#include <java/lang/reflect/Modifier.h>

#include <gnu/gcj/RawData.h>

#define _Jv_FIELD_UNRESOLVED_FLAG       0x8000

#define _Jv_FIELD_CONSTANT_VALUE        0x4000

struct _Jv_Field

{

  struct _Jv_Utf8Const* name;

  /* The type of the field, if isResolved().

     If !isResolved():  The fields's signature as a (Utf8Const*). */

  jclass                type;

  _Jv_ushort            flags;

  _Jv_ushort            bsize;  /* not really needed ... */

  union {

    jint                boffset;  /* offset in bytes for instance field */

    char*               addr;  /* address of static field */

    jobject* object_addr;  /* address of static object field... etc */

    jbyte* byte_addr;

    jshort* short_addr;

    jchar* char_addr;

    jint* int_addr;

    jlong* long_addr;

    jfloat* float_addr;

    jdouble* double_addr;

  } u;

#ifdef __cplusplus

  jboolean isResolved ()

  { return ! (flags & _Jv_FIELD_UNRESOLVED_FLAG); }

  public:

  int getOffset () { return u.boffset; }

  jobject getObjectField (jobject obj)

  { return *(jobject *)((char *)obj + getOffset ()); }

  jfieldID getNextField () { return this + 1; }

  jboolean isRef ()

    {

      if (!isResolved ())

        {

          char first = ((_Jv_Utf8Const*)type)->first();

          return first == '[' || first == 'L';

        }

      else

        {

          return ! type->isPrimitive ();

        }

    }

  jclass getClass ()

  {

    // We can't use JvAssert here because it is not in a public

    // header.

    // JvAssert (isResolved ());

    return type;

  }

  // Need to mask off all unknown/internal flags before returning.

  int getModifiers()

  {

    return flags & java::lang::reflect::Modifier::ALL_FLAGS;

  }

  _Jv_Utf8Const * getNameUtf8Const (jclass) { return name; }

#endif

};

#ifdef __cplusplus

inline jbyte

_Jv_GetStaticByteField (jclass, _Jv_Field* field)

{

  return * (jbyte *) field->u.addr;

}

inline jshort

_Jv_GetStaticShortField (jclass, _Jv_Field* field)

{

  return * (jshort *) field->u.addr;

}

inline jint

_Jv_GetStaticIntField (jclass, _Jv_Field* field)

{

  return * (jint *) field->u.addr;

}

inline jlong

_Jv_GetStaticLongField (jclass, _Jv_Field* field)

{

  return * (jlong *) field->u.addr;

}

inline jobject

_Jv_GetObjectField (jobject obj, _Jv_Field* field)

{

  return field->getObjectField (obj);

}

inline jbyte

_Jv_GetByteField (jobject obj, _Jv_Field* field)

{

  return * (jbyte *) ((char*) obj + field->getOffset ());

}

inline jshort

_Jv_GetShortField (jobject obj, _Jv_Field* field)

{

  return * (jshort *) ((char*) obj + field->getOffset ());

}

inline jint

_Jv_GetIntField (jobject obj, _Jv_Field* field)

{

  return * (jint *) ((char*) obj + field->getOffset ());

}

inline jlong

_Jv_GetLongField (jobject obj, _Jv_Field* field)

{

  return * (jlong *) ((char*) obj + field->getOffset ());

}

extern inline jfieldID

_Jv_FromReflectedField (java::lang::reflect::Field *field)

{

  return (jfieldID) ((char *) field->declaringClass->fields + field->offset);

}

#ifdef __GCJ_CNI_H__

extern inline jfieldID

JvGetFirstInstanceField (jclass klass)

{

  return &(klass->fields[klass->static_field_count]);

}

extern inline jint

JvNumInstanceFields (jclass klass)

{

  return klass->field_count - klass->static_field_count;

}

extern inline jfieldID

JvGetFirstStaticField (jclass klass)

{

  return &(klass->fields[0]);

}

extern inline jint

JvNumStaticFields (jclass klass)

{

  return klass->static_field_count;

}

extern inline jboolean

JvFieldIsRef (jfieldID field)

{

  return field->isRef () && field->type != &gnu::gcj::RawData::class$;

}

extern inline jobject

JvGetObjectField (jobject obj, _Jv_Field* field)

{

  return _Jv_GetObjectField (obj, field);

}

#endif /* defined (__GCJ_CNI_H__) */

#endif /* __cplusplus */

#endif /* __GCJ_FIELD_H */