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/*
* Copyright (C) 2013 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 "base/histogram-inl.h"
#include "common_test.h"
#include "leb128.h"
#include "leb128_encoder.h"
namespace art {
class Leb128Test : public CommonTest {};
struct DecodeUnsignedLeb128TestCase {
uint32_t decoded;
uint8_t leb128_data[5];
};
static DecodeUnsignedLeb128TestCase uleb128_tests[] = {
{0, {0, 0, 0, 0, 0}},
{1, {1, 0, 0, 0, 0}},
{0x7F, {0x7F, 0, 0, 0, 0}},
{0x80, {0x80, 1, 0, 0, 0}},
{0x81, {0x81, 1, 0, 0, 0}},
{0xFF, {0xFF, 1, 0, 0, 0}},
{0x4000, {0x80, 0x80, 1, 0, 0}},
{0x4001, {0x81, 0x80, 1, 0, 0}},
{0x4081, {0x81, 0x81, 1, 0, 0}},
{0x0FFFFFFF, {0xFF, 0xFF, 0xFF, 0x7F, 0}},
{0xFFFFFFFF, {0xFF, 0xFF, 0xFF, 0xFF, 0xF}},
};
TEST_F(Leb128Test, Singles) {
// Test individual encodings.
for (size_t i = 0; i < arraysize(uleb128_tests); ++i) {
UnsignedLeb128EncodingVector builder;
builder.PushBack(uleb128_tests[i].decoded);
const uint8_t* data_ptr = &uleb128_tests[i].leb128_data[0];
const uint8_t* encoded_data_ptr = &builder.GetData()[0];
for (size_t j = 0; j < 5; ++j) {
if (j < builder.GetData().size()) {
EXPECT_EQ(data_ptr[j], encoded_data_ptr[j]) << " i = " << i << " j = " << j;
} else {
EXPECT_EQ(data_ptr[j], 0U) << " i = " << i << " j = " << j;
}
}
EXPECT_EQ(DecodeUnsignedLeb128(&data_ptr), uleb128_tests[i].decoded) << " i = " << i;
}
}
TEST_F(Leb128Test, Stream) {
// Encode a number of entries.
UnsignedLeb128EncodingVector builder;
for (size_t i = 0; i < arraysize(uleb128_tests); ++i) {
builder.PushBack(uleb128_tests[i].decoded);
}
const uint8_t* encoded_data_ptr = &builder.GetData()[0];
for (size_t i = 0; i < arraysize(uleb128_tests); ++i) {
const uint8_t* data_ptr = &uleb128_tests[i].leb128_data[0];
for (size_t j = 0; j < 5; ++j) {
if (data_ptr[j] != 0) {
EXPECT_EQ(data_ptr[j], encoded_data_ptr[j]) << " i = " << i << " j = " << j;
}
}
EXPECT_EQ(DecodeUnsignedLeb128(&encoded_data_ptr), uleb128_tests[i].decoded) << " i = " << i;
}
}
TEST_F(Leb128Test, Speed) {
UniquePtr<Histogram<uint64_t> > enc_hist(new Histogram<uint64_t>("Leb128EncodeSpeedTest", 5));
UniquePtr<Histogram<uint64_t> > dec_hist(new Histogram<uint64_t>("Leb128DecodeSpeedTest", 5));
UnsignedLeb128EncodingVector builder;
// Push back 1024 chunks of 1024 values measuring encoding speed.
uint64_t last_time = NanoTime();
for (size_t i = 0; i < 1024; i++) {
for (size_t j = 0; j < 1024; j++) {
builder.PushBack((i * 1024) + j);
}
uint64_t cur_time = NanoTime();
enc_hist->AddValue(cur_time - last_time);
last_time = cur_time;
}
// Verify encoding and measure decode speed.
const uint8_t* encoded_data_ptr = &builder.GetData()[0];
last_time = NanoTime();
for (size_t i = 0; i < 1024; i++) {
for (size_t j = 0; j < 1024; j++) {
EXPECT_EQ(DecodeUnsignedLeb128(&encoded_data_ptr), (i * 1024) + j);
}
uint64_t cur_time = NanoTime();
dec_hist->AddValue(cur_time - last_time);
last_time = cur_time;
}
Histogram<uint64_t>::CumulativeData enc_data;
enc_hist->CreateHistogram(&enc_data);
enc_hist->PrintConfidenceIntervals(std::cout, 0.99, enc_data);
Histogram<uint64_t>::CumulativeData dec_data;
dec_hist->CreateHistogram(&dec_data);
dec_hist->PrintConfidenceIntervals(std::cout, 0.99, dec_data);
}
} // namespace art
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