gcc/libjava/include/java-field.h

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1999-04-07 16:42:40 +02:00
// java-field.h - Header file for fieldID instances. -*- c++ -*-
/* Copyright (C) 1998, 1999 Cygnus Solutions
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 __JAVA_FIELD_H__
#define __JAVA_FIELD_H__
#include <java/lang/Class.h>
#include <java/lang/reflect/Field.h>
#define _Jv_FIELD_UNRESOLVED_FLAG 0x8000
#define _Jv_FIELD_CONSTANT_VALUE 0x4000
struct _Jv_Field
{
#ifndef COMPACT_FIELDS
struct _Jv_Utf8Const* name;
#endif
/* The type of the field, if isResolved().
If !isResolved(): The fields's signature as a (Utf8Const*). */
jclass type;
_Jv_ushort flags;
#ifdef COMPACT_FIELDS
short nameIndex; /* ofsfet in class's name table */
#else
_Jv_ushort bsize; /* not really needed ... */
#endif
union {
int boffset; /* offset in bytes for instance field */
void* addr; /* address of static field */
} 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 getNextInstanceField () { return this + 1; }
jboolean isRef () { return ! isResolved () || ! type->isPrimitive (); }
// FIXME - may need to mask off internal flags.
int getModifiers() { return flags; }
#ifdef COMPACT_FIELDS
_Jv_Utf8Const * getNameUtf8Const (jclass cls)
{ return clas->fieldNames + nameIndex; }
#else
_Jv_Utf8Const * getNameUtf8Const (jclass) { return name; }
#endif
#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 __JAVA_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 jboolean
JvFieldIsRef (jfieldID field)
{
return field->isRef ();
}
extern inline jobject
JvGetObjectField (jobject obj, _Jv_Field* field)
{
return _Jv_GetObjectField (obj, field);
}
#endif /* defined (__JAVA_CNI_H__) */
#endif
#endif /* __JAVA_FIELD_H */