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102 lines
4.0 KiB
C++
102 lines
4.0 KiB
C++
/*
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* Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_OOPS_COMPRESSEDKLASS_INLINE_HPP
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#define SHARE_OOPS_COMPRESSEDKLASS_INLINE_HPP
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#include "oops/compressedKlass.hpp"
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#include "memory/universe.hpp"
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#include "oops/oop.hpp"
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#include "utilities/align.hpp"
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#include "utilities/globalDefinitions.hpp"
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inline Klass* CompressedKlassPointers::decode_not_null_without_asserts(narrowKlass v, address narrow_base_base, int shift) {
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return (Klass*)((uintptr_t)narrow_base_base +((uintptr_t)v << shift));
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}
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inline narrowKlass CompressedKlassPointers::encode_not_null_without_asserts(Klass* k, address narrow_base, int shift) {
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return (narrowKlass)(pointer_delta(k, narrow_base, 1) >> shift);
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}
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inline Klass* CompressedKlassPointers::decode_not_null_without_asserts(narrowKlass v) {
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return decode_not_null_without_asserts(v, base(), shift());
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}
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inline Klass* CompressedKlassPointers::decode_without_asserts(narrowKlass v) {
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return is_null(v) ? nullptr : decode_not_null_without_asserts(v, base(), shift());
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}
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inline Klass* CompressedKlassPointers::decode_not_null(narrowKlass v) {
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assert(!is_null(v), "narrow klass value can never be zero");
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DEBUG_ONLY(check_valid_narrow_klass_id(v);)
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Klass* const k = decode_not_null_without_asserts(v, base(), shift());
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DEBUG_ONLY(check_encodable(k));
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return k;
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}
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inline Klass* CompressedKlassPointers::decode(narrowKlass v) {
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return is_null(v) ? nullptr : decode_not_null(v);
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}
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inline narrowKlass CompressedKlassPointers::encode_not_null(Klass* v) {
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assert(!is_null(v), "klass value can never be zero");
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DEBUG_ONLY(check_encodable(v);)
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const narrowKlass nk = encode_not_null_without_asserts(v, base(), shift());
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assert(decode_not_null_without_asserts(nk, base(), shift()) == v, "reversibility");
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DEBUG_ONLY(check_valid_narrow_klass_id(nk);)
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return nk;
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}
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inline narrowKlass CompressedKlassPointers::encode(Klass* v) {
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return is_null(v) ? (narrowKlass)0 : encode_not_null(v);
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}
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#ifdef ASSERT
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inline void CompressedKlassPointers::check_encodable(const void* addr) {
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assert(UseCompressedClassPointers, "Only call for +UseCCP");
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assert(addr != nullptr, "Null Klass?");
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assert(is_encodable(addr),
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"Address " PTR_FORMAT " is not encodable (Klass range: " RANGEFMT ", klass alignment: %d)",
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p2i(addr), RANGE2FMTARGS(_klass_range_start, _klass_range_end), klass_alignment_in_bytes());
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}
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inline void CompressedKlassPointers::check_valid_narrow_klass_id(narrowKlass nk) {
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check_init(_base);
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assert(UseCompressedClassPointers, "Only call for +UseCCP");
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assert(nk > 0, "narrow Klass ID is 0");
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const uint64_t nk_mask = ~right_n_bits(narrow_klass_pointer_bits());
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assert(((uint64_t)nk & nk_mask) == 0, "narrow klass id bit spillover (%u)", nk);
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assert(nk >= _lowest_valid_narrow_klass_id &&
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nk <= _highest_valid_narrow_klass_id, "narrowKlass ID out of range (%u)", nk);
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}
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#endif // ASSERT
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inline address CompressedKlassPointers::encoding_range_end() {
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const int max_bits = narrow_klass_pointer_bits() + _shift;
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return _base + nth_bit(max_bits);
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}
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#endif // SHARE_OOPS_COMPRESSEDKLASS_INLINE_HPP
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