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/*
* Copyright (c) 2016, 2023, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "precompiled.hpp"
#include "gc/shared/memset_with_concurrent_readers.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/vmassert_uninstall.hpp"
#include <iomanip>
#include <string.h>
#include <sstream>
#include "utilities/vmassert_reinstall.hpp"
#include "unittest.hpp"
static unsigned line_byte(const char* line, size_t i) {
return unsigned(line[i]) & 0xFF;
}
TEST(gc, memset_with_concurrent_readers) {
const size_t chunk_size = 8 * BytesPerWord;
const unsigned chunk_count = 4;
const size_t block_size = (chunk_count + 4) * chunk_size;
char block[block_size];
char clear_block[block_size];
char set_block[block_size];
// block format:
// 0: unused leading chunk
// 1: chunk written from start index to end of chunk
// ... nchunks fully written chunks
// N: chunk written from start of chunk to end index
// N+1: unused trailing chunk
const int clear_value = 0;
const int set_value = 0xAC;
memset(clear_block, clear_value, block_size);
memset(set_block, set_value, block_size);
for (unsigned nchunks = 0; nchunks <= chunk_count; ++nchunks) {
for (size_t start = 1; start <= chunk_size; ++start) {
for (size_t end = 0; end <= chunk_size; ++end) {
size_t set_start = chunk_size + start;
size_t set_end = (2 + nchunks) * chunk_size + end;
size_t set_size = set_end - set_start;
memset(block, clear_value, block_size);
memset_with_concurrent_readers(&block[set_start], set_value, set_size);
bool head_clear = !memcmp(clear_block, block, set_start);
bool middle_set = !memcmp(set_block, block + set_start, set_size);
bool tail_clear = !memcmp(clear_block, block + set_end, block_size - set_end);
if (!(head_clear && middle_set && tail_clear)) {
std::ostringstream err_stream;
err_stream << "*** memset_with_concurrent_readers failed: set start "
<< set_start << ", set end " << set_end << std::endl;
for (unsigned chunk = 0; chunk < (block_size / chunk_size); ++chunk) {
for (unsigned line = 0; line < (chunk_size / BytesPerWord); ++line) {
const char* lp = &block[chunk * chunk_size + line * BytesPerWord];
err_stream << std::dec << chunk << "," << line << ": " << std::hex
<< std::setw(2) << line_byte(lp, 0) << " "
<< std::setw(2) << line_byte(lp, 1) << " "
<< std::setw(2) << line_byte(lp, 2) << " "
<< std::setw(2) << line_byte(lp, 3) << " "
<< std::setw(2) << line_byte(lp, 4) << " "
<< std::setw(2) << line_byte(lp, 5) << " "
<< std::setw(2) << line_byte(lp, 6) << " "
<< std::setw(2) << line_byte(lp, 7) << std::endl;
}
}
EXPECT_TRUE(head_clear) << "leading byte not clear";
EXPECT_TRUE(middle_set) << "memset byte not set";
EXPECT_TRUE(tail_clear) << "trailing bye not clear";
ASSERT_TRUE(head_clear && middle_set && tail_clear) << err_stream.str();
}
}
}
}
}
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