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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <memory>
#include <cutils/memory.h>
#include <gtest/gtest.h>
#define FENCEPOST_LENGTH 8
#define MAX_TEST_SIZE (64*1024)
// Choose values that have no repeating byte values.
#define MEMSET16_PATTERN 0xb139
#define MEMSET32_PATTERN 0x48193a27
enum test_e {
MEMSET16 = 0,
MEMSET32,
};
static int g_memset16_aligns[][2] = {
{ 2, 0 },
{ 4, 0 },
{ 8, 0 },
{ 16, 0 },
{ 32, 0 },
{ 64, 0 },
{ 128, 0 },
{ 4, 2 },
{ 8, 2 },
{ 8, 4 },
{ 8, 6 },
{ 128, 2 },
{ 128, 4 },
{ 128, 6 },
{ 128, 8 },
{ 128, 10 },
{ 128, 12 },
{ 128, 14 },
{ 128, 16 },
};
static int g_memset32_aligns[][2] = {
{ 4, 0 },
{ 8, 0 },
{ 16, 0 },
{ 32, 0 },
{ 64, 0 },
{ 128, 0 },
{ 8, 4 },
{ 128, 4 },
{ 128, 8 },
{ 128, 12 },
{ 128, 16 },
};
static size_t GetIncrement(size_t len, size_t min_incr) {
if (len >= 4096) {
return 1024;
} else if (len >= 1024) {
return 256;
}
return min_incr;
}
// Return a pointer into the current buffer with the specified alignment.
static void *GetAlignedPtr(void *orig_ptr, int alignment, int or_mask) {
uint64_t ptr = reinterpret_cast<uint64_t>(orig_ptr);
if (alignment > 0) {
// When setting the alignment, set it to exactly the alignment chosen.
// The pointer returned will be guaranteed not to be aligned to anything
// more than that.
ptr += alignment - (ptr & (alignment - 1));
ptr |= alignment | or_mask;
}
return reinterpret_cast<void*>(ptr);
}
static void SetFencepost(uint8_t *buffer) {
for (int i = 0; i < FENCEPOST_LENGTH; i += 2) {
buffer[i] = 0xde;
buffer[i+1] = 0xad;
}
}
static void VerifyFencepost(uint8_t *buffer) {
for (int i = 0; i < FENCEPOST_LENGTH; i += 2) {
if (buffer[i] != 0xde || buffer[i+1] != 0xad) {
uint8_t expected_value;
if (buffer[i] == 0xde) {
i++;
expected_value = 0xad;
} else {
expected_value = 0xde;
}
ASSERT_EQ(expected_value, buffer[i]);
}
}
}
void RunMemsetTests(test_e test_type, uint32_t value, int align[][2], size_t num_aligns) {
size_t min_incr = 4;
if (test_type == MEMSET16) {
min_incr = 2;
value |= value << 16;
}
std::unique_ptr<uint32_t[]> expected_buf(new uint32_t[MAX_TEST_SIZE/sizeof(uint32_t)]);
for (size_t i = 0; i < MAX_TEST_SIZE/sizeof(uint32_t); i++) {
expected_buf[i] = value;
}
// Allocate one large buffer with lots of extra space so that we can
// guarantee that all possible alignments will fit.
std::unique_ptr<uint8_t[]> buf(new uint8_t[3*MAX_TEST_SIZE]);
uint8_t *buf_align;
for (size_t i = 0; i < num_aligns; i++) {
size_t incr = min_incr;
for (size_t len = incr; len <= MAX_TEST_SIZE; len += incr) {
incr = GetIncrement(len, min_incr);
buf_align = reinterpret_cast<uint8_t*>(GetAlignedPtr(
buf.get()+FENCEPOST_LENGTH, align[i][0], align[i][1]));
SetFencepost(&buf_align[-FENCEPOST_LENGTH]);
SetFencepost(&buf_align[len]);
memset(buf_align, 0xff, len);
if (test_type == MEMSET16) {
android_memset16(reinterpret_cast<uint16_t*>(buf_align), value, len);
} else {
android_memset32(reinterpret_cast<uint32_t*>(buf_align), value, len);
}
ASSERT_EQ(0, memcmp(expected_buf.get(), buf_align, len))
<< "Failed size " << len << " align " << align[i][0] << " " << align[i][1] << "\n";
VerifyFencepost(&buf_align[-FENCEPOST_LENGTH]);
VerifyFencepost(&buf_align[len]);
}
}
}
TEST(libcutils, android_memset16_non_zero) {
RunMemsetTests(MEMSET16, MEMSET16_PATTERN, g_memset16_aligns, sizeof(g_memset16_aligns)/sizeof(int[2]));
}
TEST(libcutils, android_memset16_zero) {
RunMemsetTests(MEMSET16, 0, g_memset16_aligns, sizeof(g_memset16_aligns)/sizeof(int[2]));
}
TEST(libcutils, android_memset32_non_zero) {
RunMemsetTests(MEMSET32, MEMSET32_PATTERN, g_memset32_aligns, sizeof(g_memset32_aligns)/sizeof(int[2]));
}
TEST(libcutils, android_memset32_zero) {
RunMemsetTests(MEMSET32, 0, g_memset32_aligns, sizeof(g_memset32_aligns)/sizeof(int[2]));
}
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