159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
// java-field.h - Header file for fieldID instances. -*- c++ -*-
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/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#ifndef __JAVA_FIELD_H__
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#define __JAVA_FIELD_H__
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#include <java/lang/Class.h>
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#include <java/lang/reflect/Field.h>
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#define _Jv_FIELD_UNRESOLVED_FLAG 0x8000
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#define _Jv_FIELD_CONSTANT_VALUE 0x4000
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struct _Jv_Field
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{
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#ifndef COMPACT_FIELDS
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struct _Jv_Utf8Const* name;
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#endif
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/* The type of the field, if isResolved().
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If !isResolved(): The fields's signature as a (Utf8Const*). */
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jclass type;
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_Jv_ushort flags;
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#ifdef COMPACT_FIELDS
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short nameIndex; /* ofsfet in class's name table */
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#else
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_Jv_ushort bsize; /* not really needed ... */
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#endif
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union {
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int boffset; /* offset in bytes for instance field */
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void* addr; /* address of static field */
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} u;
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#ifdef __cplusplus
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jboolean isResolved ()
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{ return ! (flags & _Jv_FIELD_UNRESOLVED_FLAG); }
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public:
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int getOffset () { return u.boffset; }
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jobject getObjectField (jobject obj)
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{ return *(jobject *)((char *)obj + getOffset ()); }
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jfieldID getNextInstanceField () { return this + 1; }
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jboolean isRef () { return ! isResolved () || ! type->isPrimitive (); }
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// FIXME - may need to mask off internal flags.
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int getModifiers() { return flags; }
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#ifdef COMPACT_FIELDS
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_Jv_Utf8Const * getNameUtf8Const (jclass cls)
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{ return clas->fieldNames + nameIndex; }
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#else
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_Jv_Utf8Const * getNameUtf8Const (jclass) { return name; }
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#endif
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#endif
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};
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#ifdef __cplusplus
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inline jbyte
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_Jv_GetStaticByteField (jclass, _Jv_Field* field)
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{
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return * (jbyte *) field->u.addr;
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}
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inline jshort
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_Jv_GetStaticShortField (jclass, _Jv_Field* field)
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{
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return * (jshort *) field->u.addr;
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}
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inline jint
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_Jv_GetStaticIntField (jclass, _Jv_Field* field)
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{
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return * (jint *) field->u.addr;
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}
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inline jlong
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_Jv_GetStaticLongField (jclass, _Jv_Field* field)
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{
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return * (jlong *) field->u.addr;
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}
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inline jobject
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_Jv_GetObjectField (jobject obj, _Jv_Field* field)
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{
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return field->getObjectField (obj);
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}
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inline jbyte
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_Jv_GetByteField (jobject obj, _Jv_Field* field)
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{
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return * (jbyte *) ((char*) obj + field->getOffset ());
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}
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inline jshort
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_Jv_GetShortField (jobject obj, _Jv_Field* field)
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{
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return * (jshort *) ((char*) obj + field->getOffset ());
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}
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inline jint
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_Jv_GetIntField (jobject obj, _Jv_Field* field)
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{
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return * (jint *) ((char*) obj + field->getOffset ());
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}
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inline jlong
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_Jv_GetLongField (jobject obj, _Jv_Field* field)
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{
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return * (jlong *) ((char*) obj + field->getOffset ());
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}
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extern inline jfieldID
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_Jv_FromReflectedField (java::lang::reflect::Field *field)
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{
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return (jfieldID) ((char *) field->declaringClass->fields + field->offset);
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}
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#ifdef __JAVA_CNI_H__
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extern inline jfieldID
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JvGetFirstInstanceField (jclass klass)
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{
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return &(klass->fields[klass->static_field_count]);
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}
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extern inline jint
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JvNumInstanceFields (jclass klass)
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{
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return klass->field_count - klass->static_field_count;
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}
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extern inline jboolean
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JvFieldIsRef (jfieldID field)
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{
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return field->isRef ();
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}
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extern inline jobject
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JvGetObjectField (jobject obj, _Jv_Field* field)
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{
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return _Jv_GetObjectField (obj, field);
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}
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#endif /* defined (__JAVA_CNI_H__) */
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#endif
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#endif /* __JAVA_FIELD_H */
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