/*
* Copyright ( c ) 2017 , 2020 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
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*/
#ifndef SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
#define SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
#include "gc/z/zBitField.hpp"
#include "memory/allocation.hpp"
//
// Allocation flags layout
// -----------------------
//
// 7 2 1 0
// +-----+-+-+-+
// |00000|1|1|1|
// +-----+-+-+-+
// | | | |
// | | | * 0-0 Non-Blocking Flag (1-bit)
// | | |
// | | * 1-1 Worker Relocation Flag (1-bit)
// | |
// | * 2-2 Low Address Flag (1-bit)
// |
// * 7-3 Unused (5-bits)
//
class ZAllocationFlags {
private :
typedef ZBitField<uint8_t, bool , 0 , 1 > field_non_blocking;
typedef ZBitField<uint8_t, bool , 1 , 1 > field_worker_relocation;
typedef ZBitField<uint8_t, bool , 2 , 1 > field_low_address;
uint8_t _flags;
public :
ZAllocationFlags() :
_flags(0 ) {}
void set_non_blocking() {
_flags |= field_non_blocking::encode(true );
}
void set_worker_relocation() {
_flags |= field_worker_relocation::encode(true );
}
void set_low_address() {
_flags |= field_low_address::encode(true );
}
bool non_blocking() const {
return field_non_blocking::decode(_flags);
}
bool worker_relocation() const {
return field_worker_relocation::decode(_flags);
}
bool low_address() const {
return field_low_address::decode(_flags);
}
};
#endif // SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
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