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72 lines
3.2 KiB
C++
72 lines
3.2 KiB
C++
/*
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* Copyright (c) 2026 salesforce.com, inc. 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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#include "cds/aotCompressedPointers.hpp"
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#include "unittest.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include <cstdint>
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TEST_VM(ScaledOffsetsTest, constants) {
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#ifdef _LP64
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ASSERT_EQ((size_t)3, AOTCompressedPointers::MetadataOffsetShift);
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ASSERT_TRUE(is_aligned(AOTCompressedPointers::MaxMetadataOffsetBytes, (size_t)1 << AOTCompressedPointers::MetadataOffsetShift));
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ASSERT_EQ((size_t)(3584ULL * M), AOTCompressedPointers::MaxMetadataOffsetBytes);
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#else
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ASSERT_EQ((size_t)0, AOTCompressedPointers::MetadataOffsetShift);
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ASSERT_EQ((size_t)0x7FFFFFFF, AOTCompressedPointers::MaxMetadataOffsetBytes);
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#endif
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}
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TEST_VM(ScaledOffsetsTest, encode_decode_roundtrip) {
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// Test that encoding and decoding via get_byte_offset produces correct results
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const size_t unit = (size_t)1 << AOTCompressedPointers::MetadataOffsetShift;
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// Test that get_byte_offset correctly applies the shift
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// Note: We can't directly test encode_byte_offset as it's private, but we can verify
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// the shift value is applied correctly in get_byte_offset
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AOTCompressedPointers::narrowPtr np1 = static_cast<AOTCompressedPointers::narrowPtr>(1);
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ASSERT_EQ(unit, AOTCompressedPointers::get_byte_offset(np1));
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AOTCompressedPointers::narrowPtr np2 = static_cast<AOTCompressedPointers::narrowPtr>(2);
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ASSERT_EQ(2 * unit, AOTCompressedPointers::get_byte_offset(np2));
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AOTCompressedPointers::narrowPtr np1024 = static_cast<AOTCompressedPointers::narrowPtr>(1024);
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ASSERT_EQ(1024 * unit, AOTCompressedPointers::get_byte_offset(np1024));
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#ifdef _LP64
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const uint64_t max_units = (uint64_t)UINT32_MAX;
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AOTCompressedPointers::narrowPtr np_max = static_cast<AOTCompressedPointers::narrowPtr>(UINT32_MAX);
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const uint64_t max_bytes = max_units << AOTCompressedPointers::MetadataOffsetShift;
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ASSERT_EQ(max_bytes, AOTCompressedPointers::get_byte_offset(np_max));
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ASSERT_GE(max_bytes, AOTCompressedPointers::MaxMetadataOffsetBytes - unit);
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#endif
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}
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TEST_VM(ScaledOffsetsTest, null_handling) {
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// Test that null() returns 0
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ASSERT_EQ(static_cast<AOTCompressedPointers::narrowPtr>(0), AOTCompressedPointers::null());
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ASSERT_EQ((size_t)0, AOTCompressedPointers::get_byte_offset(AOTCompressedPointers::null()));
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}
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