Index: sdch/open_vcdiff/depot/opensource/open-vcdiff/src/addrcache_test.cc |
=================================================================== |
--- sdch/open_vcdiff/depot/opensource/open-vcdiff/src/addrcache_test.cc (revision 2678) |
+++ sdch/open_vcdiff/depot/opensource/open-vcdiff/src/addrcache_test.cc (working copy) |
@@ -1,670 +0,0 @@ |
-// Copyright 2007 Google Inc. |
-// Author: Lincoln Smith |
-// |
-// 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 <config.h> |
-#include "addrcache.h" |
-#include <stdint.h> // uint32_t |
-#include <climits> // INT_MAX, INT_MIN |
-#include <cstdlib> // rand, srand |
-#include <string> |
-#include <vector> |
-#include "logging.h" |
-#include "testing.h" |
-#include "varint_bigendian.h" |
-#include "vcdiff_defs.h" // RESULT_ERROR |
- |
-namespace open_vcdiff { |
- |
-using std::string; |
- |
-namespace { |
- |
-// Provides an address_stream_ buffer and functions to manually encode |
-// values into the buffer, and to manually decode and verify test results |
-// from the buffer. |
-// |
-class VCDiffAddressCacheTest : public testing::Test { |
- public: |
- VCDiffAddressCacheTest() : decode_position_(NULL), |
- decode_position_end_(NULL), |
- verify_encode_position_(NULL), |
- last_encode_size_(0), |
- last_decode_position_(NULL) { } |
- |
- virtual ~VCDiffAddressCacheTest() { } |
- |
- virtual void SetUp() { |
- EXPECT_TRUE(cache_.Init()); |
- } |
- |
- // Benchmarks for timing encode/decode operations |
- void BM_Setup(int test_size, bool print_stats); |
- void BM_CacheEncode(int iterations, int test_size); |
- void BM_CacheDecode(int iterations, int test_size); |
- |
- protected: |
- virtual void TestBody() { } // to allow instantiation of this class |
- |
- void BeginDecode() { |
- decode_position_ = address_stream_.data(); |
- EXPECT_TRUE(decode_position_ != NULL); |
- last_decode_position_ = decode_position_; |
- decode_position_end_ = decode_position_ + address_stream_.size(); |
- } |
- |
- void ExpectEncodedSizeInBytes(int n) { |
- EXPECT_EQ(last_encode_size_ + n, address_stream_.size()); |
- last_encode_size_ = address_stream_.size(); |
- } |
- |
- void ExpectDecodedSizeInBytes(int n) { |
- EXPECT_EQ(last_decode_position_ + n, decode_position_); |
- last_decode_position_ = decode_position_; |
- } |
- |
- void ManualEncodeVarint(VCDAddress value) { |
- VarintBE<VCDAddress>::AppendToString(value, &address_stream_); |
- } |
- |
- void ManualEncodeByte(unsigned char byte) { |
- address_stream_.push_back(byte); |
- } |
- |
- void ExpectEncodedVarint(VCDAddress expected_value, int expected_size) { |
- if (!verify_encode_position_) { |
- verify_encode_position_ = address_stream_.data(); |
- } |
- EXPECT_EQ(expected_size, VarintBE<VCDAddress>::Length(expected_value)); |
- VCDAddress output_val = VarintBE<VCDAddress>::Parse( |
- address_stream_.data() + address_stream_.size(), |
- &verify_encode_position_); |
- EXPECT_EQ(expected_value, output_val); |
- } |
- |
- void ExpectEncodedByte(unsigned char expected_value) { |
- if (!verify_encode_position_) { |
- verify_encode_position_ = address_stream_.data(); |
- } |
- EXPECT_EQ(expected_value, *verify_encode_position_); |
- ++verify_encode_position_; |
- } |
- |
- void TestEncode(VCDAddress address, |
- VCDAddress here_address, |
- unsigned char mode, |
- int size) { |
- VCDAddress encoded_addr = 0; |
- EXPECT_EQ(mode, cache_.EncodeAddress(address, here_address, &encoded_addr)); |
- if (cache_.WriteAddressAsVarintForMode(mode)) { |
- ManualEncodeVarint(encoded_addr); |
- } else { |
- EXPECT_GT(256, encoded_addr); |
- ManualEncodeByte(static_cast<unsigned char>(encoded_addr)); |
- } |
- ExpectEncodedSizeInBytes(size); |
- } |
- |
- VCDiffAddressCache cache_; |
- string address_stream_; |
- const char* decode_position_; |
- const char* decode_position_end_; |
- string large_address_stream_; |
- std::vector<unsigned char> mode_stream_; |
- std::vector<VCDAddress> verify_stream_; |
- |
- private: |
- const char* verify_encode_position_; |
- string::size_type last_encode_size_; |
- const char* last_decode_position_; |
-}; |
- |
-#ifdef GTEST_HAS_DEATH_TEST |
-// This synonym is needed for the tests that use ASSERT_DEATH |
-typedef VCDiffAddressCacheTest VCDiffAddressCacheDeathTest; |
-#endif // GTEST_HAS_DEATH_TEST |
- |
-// Having either or both cache size == 0 is acceptable |
-TEST_F(VCDiffAddressCacheTest, ZeroCacheSizes) { |
- VCDiffAddressCache zero_cache(0, 0); |
- EXPECT_TRUE(zero_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, NegativeCacheSizes) { |
- VCDiffAddressCache negative_cache(-1, -1); // The constructor must not fail |
- EXPECT_FALSE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, OnlySameCacheSizeIsNegative) { |
- VCDiffAddressCache negative_cache(0, -1); // The constructor must not fail |
- EXPECT_FALSE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, ExtremePositiveCacheSizes) { |
- // The constructor must not fail |
- VCDiffAddressCache int_max_cache(INT_MAX, INT_MAX); |
- EXPECT_FALSE(int_max_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, ExtremeNegativeCacheSizes) { |
- // The constructor must not fail |
- VCDiffAddressCache int_min_cache(INT_MIN, INT_MIN); |
- EXPECT_FALSE(int_min_cache.Init()); |
-} |
- |
-// VCD_MAX_MODES is the maximum number of modes, including SAME and HERE modes. |
-// So neither the SAME cache nor the HERE cache can be larger than |
-// (VCD_MAX_MODES - 2). |
-TEST_F(VCDiffAddressCacheTest, NearCacheSizeIsTooBig) { |
- VCDiffAddressCache negative_cache(VCD_MAX_MODES - 1, 0); |
- EXPECT_FALSE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, SameCacheSizeIsTooBig) { |
- VCDiffAddressCache negative_cache(0, VCD_MAX_MODES - 1); |
- EXPECT_FALSE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, CombinedSizesAreTooBig) { |
- VCDiffAddressCache negative_cache((VCD_MAX_MODES / 2), |
- (VCD_MAX_MODES / 2) - 1); |
- EXPECT_FALSE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, MaxLegalNearCacheSize) { |
- VCDiffAddressCache negative_cache(VCD_MAX_MODES - 2, 0); |
- EXPECT_TRUE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, MaxLegalSameCacheSize) { |
- VCDiffAddressCache negative_cache(0, VCD_MAX_MODES - 2); |
- EXPECT_TRUE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, MaxLegalCombinedSizes) { |
- VCDiffAddressCache negative_cache((VCD_MAX_MODES / 2) - 1, |
- (VCD_MAX_MODES / 2) - 1); |
- EXPECT_TRUE(negative_cache.Init()); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, DestroyWithoutInitialization) { |
- VCDiffAddressCache no_init_cache(4, 3); |
- // Should be destroyed without crashing |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, DestroyDefaultWithoutInitialization) { |
- VCDiffAddressCache no_init_cache; |
- // Should be destroyed without crashing |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, CacheContentsInitiallyZero) { |
- VCDAddress test_address = 0; |
- // Check that caches are initially set to zero |
- for (test_address = 0; test_address < 4; ++test_address) { |
- EXPECT_EQ(0, cache_.NearAddress(test_address)); |
- } |
- for (test_address = 0; test_address < 256 * 3; ++test_address) { |
- EXPECT_EQ(0, cache_.SameAddress(test_address)); |
- } |
-} |
- |
-// Inserts values 1, 2, ... , 10 into the cache and tests its entire |
-// contents for consistency. |
-// |
-TEST_F(VCDiffAddressCacheTest, InsertFirstTen) { |
- VCDAddress test_address = 0; |
- for (test_address = 1; test_address <= 10; ++test_address) { |
- cache_.UpdateCache(test_address); |
- } |
- EXPECT_EQ(9, cache_.NearAddress(0)); // slot 0: 1 => 5 => 9 |
- EXPECT_EQ(10, cache_.NearAddress(1)); // slot 1: 2 => 6 => 10 |
- EXPECT_EQ(7, cache_.NearAddress(2)); // slot 2: 3 => 7 |
- EXPECT_EQ(8, cache_.NearAddress(3)); // slot 3: 4 => 8 |
- EXPECT_EQ(0, cache_.SameAddress(0)); |
- for (test_address = 1; test_address <= 10; ++test_address) { |
- EXPECT_EQ(test_address, cache_.SameAddress(test_address)); |
- } |
- for (test_address = 11; test_address < 256 * 3; ++test_address) { |
- EXPECT_EQ(0, cache_.SameAddress(test_address)); |
- } |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, InsertIntMax) { |
- cache_.UpdateCache(INT_MAX); |
- EXPECT_EQ(INT_MAX, cache_.NearAddress(0)); |
- EXPECT_EQ(INT_MAX, cache_.SameAddress(INT_MAX % (256 * 3))); |
- EXPECT_EQ(0, cache_.SameAddress((INT_MAX - 256) % (256 * 3))); |
- EXPECT_EQ(0, cache_.SameAddress((INT_MAX - 512) % (256 * 3))); |
-} |
- |
-// Exercises all four addressing mode types by encoding five values |
-// with EncodeAddress. |
-// Checks to see that the proper mode was selected in each case, |
-// and that the encoding is correct. |
-// |
-TEST_F(VCDiffAddressCacheTest, EncodeAddressModes) { |
- TestEncode(0x0000FFFF, 0x10000000, VCD_SELF_MODE, 3); |
- TestEncode(0x10000000, 0x10000010, VCD_HERE_MODE, 1); |
- TestEncode(0x10000004, 0x10000020, cache_.FirstNearMode() + 0x01, 1); |
- TestEncode(0x0FFFFFFE, 0x10000030, VCD_HERE_MODE, 1); |
- TestEncode(0x10000004, 0x10000040, cache_.FirstSameMode() + 0x01, 1); |
- ExpectEncodedVarint(0xFFFF, 3); // SELF mode: addr 0x0000FFFF |
- ExpectEncodedVarint(0x10, 1); // HERE mode: here - 0x10 = 0x10000000 |
- ExpectEncodedVarint(0x04, 1); // NEAR cache #1: |
- // last addr + 0x4 = 0x10000004 |
- ExpectEncodedVarint(0x32, 1); // HERE mode: here - 0x32 = 0x0FFFFFFE |
- ExpectEncodedByte(0x04); // SAME cache #1: 0x10000004 hits |
-} |
- |
-// Exercises all four addressing mode types by manually encoding six values |
-// and calling DecodeAddress on each one. |
-// |
-TEST_F(VCDiffAddressCacheTest, DecodeAddressModes) { |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0x1000); |
- ManualEncodeByte(0xFE); // SAME mode uses a byte, not a Varint |
- ManualEncodeVarint(0xFE); |
- ManualEncodeVarint(0x1000); |
- BeginDecode(); |
- EXPECT_EQ(0xCAFE, |
- cache_.DecodeAddress(0x10000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- EXPECT_EQ(0x20000 - 0xCAFE, |
- cache_.DecodeAddress(0x20000, |
- VCD_HERE_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- EXPECT_EQ(0xDAFE, |
- cache_.DecodeAddress(0x30000, |
- cache_.FirstNearMode(), |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0x1000)); |
- EXPECT_EQ(0xCAFE, |
- cache_.DecodeAddress(0x40000, |
- cache_.FirstSameMode() + (0xCA % 3), |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(sizeof(unsigned char)); // a byte, not a Varint |
- EXPECT_EQ(0xFE, |
- cache_.DecodeAddress(0x50000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xFE)); |
- // NEAR mode #0 has been overwritten by fifth computed addr (wrap around) |
- EXPECT_EQ(0x10FE, |
- cache_.DecodeAddress(0x60000, |
- cache_.FirstNearMode(), |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0x1000)); |
-} |
- |
-// Test with both cache sizes == 0. The encoder should not choose |
-// a SAME or NEAR mode under these conditions. |
-TEST_F(VCDiffAddressCacheTest, EncodeAddressZeroCacheSizes) { |
- VCDAddress encoded_addr = 0; |
- VCDiffAddressCache zero_cache(0, 0); |
- EXPECT_TRUE(zero_cache.Init()); |
- EXPECT_EQ(VCD_SELF_MODE, |
- zero_cache.EncodeAddress(0x0000FFFF, 0x10000000, &encoded_addr)); |
- EXPECT_EQ(0xFFFF, encoded_addr); |
- EXPECT_EQ(VCD_HERE_MODE, |
- zero_cache.EncodeAddress(0x10000000, 0x10000010, &encoded_addr)); |
- EXPECT_EQ(0x10, encoded_addr); |
- EXPECT_EQ(VCD_HERE_MODE, |
- zero_cache.EncodeAddress(0x10000004, 0x10000020, &encoded_addr)); |
- EXPECT_EQ(0x1C, encoded_addr); |
- EXPECT_EQ(VCD_HERE_MODE, |
- zero_cache.EncodeAddress(0x0FFFFFFE, 0x10000030, &encoded_addr)); |
- EXPECT_EQ(0x32, encoded_addr); |
- EXPECT_EQ(VCD_HERE_MODE, |
- zero_cache.EncodeAddress(0x10000004, 0x10000040, &encoded_addr)); |
- EXPECT_EQ(0x3C, encoded_addr); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, DecodeAddressZeroCacheSizes) { |
- VCDiffAddressCache zero_cache(0, 0); |
- EXPECT_TRUE(zero_cache.Init()); |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0xDAFE); |
- BeginDecode(); |
- EXPECT_EQ(0xCAFE, zero_cache.DecodeAddress(0x10000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- EXPECT_EQ(0x20000 - 0xCAFE, zero_cache.DecodeAddress(0x20000, |
- VCD_HERE_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- EXPECT_EQ(0xDAFE, zero_cache.DecodeAddress(0x30000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xDAFE)); |
-} |
- |
-#ifdef GTEST_HAS_DEATH_TEST |
-TEST_F(VCDiffAddressCacheDeathTest, EncodeNegativeAddress) { |
- VCDAddress dummy_encoded_address = 0; |
- EXPECT_DEBUG_DEATH(cache_.EncodeAddress(-1, -1, &dummy_encoded_address), |
- "negative"); |
-} |
- |
-TEST_F(VCDiffAddressCacheDeathTest, EncodeAddressPastHereAddress) { |
- VCDAddress dummy_encoded_address = 0; |
- EXPECT_DEBUG_DEATH(cache_.EncodeAddress(0x100, 0x100, &dummy_encoded_address), |
- "address.*<.*here_address"); |
- EXPECT_DEBUG_DEATH(cache_.EncodeAddress(0x200, 0x100, &dummy_encoded_address), |
- "address.*<.*here_address"); |
-} |
- |
-TEST_F(VCDiffAddressCacheDeathTest, DecodeInvalidMode) { |
- ManualEncodeVarint(0xCAFE); |
- BeginDecode(); |
- EXPECT_DEBUG_DEATH(EXPECT_EQ(RESULT_ERROR, |
- cache_.DecodeAddress(0x10000000, |
- cache_.LastMode() + 1, |
- &decode_position_, |
- decode_position_end_)), |
- "mode"); |
- EXPECT_DEBUG_DEATH(EXPECT_EQ(RESULT_ERROR, |
- cache_.DecodeAddress(0x10000000, |
- 0xFF, |
- &decode_position_, |
- decode_position_end_)), |
- "mode"); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
-} |
- |
-TEST_F(VCDiffAddressCacheDeathTest, DecodeZeroOrNegativeHereAddress) { |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0xCAFE); |
- BeginDecode(); |
- // Using a Debug build, the check will fail; using a Release build, |
- // the check will not occur, and the SELF mode does not depend on |
- // the value of here_address, so DecodeAddress() will succeed. |
- EXPECT_DEBUG_DEATH(cache_.DecodeAddress(-1, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_), |
- "negative"); |
- // A zero value for here_address should not kill the decoder, |
- // but instead should return an error value. A delta file may contain |
- // a window that has no source segment and that (erroneously) |
- // uses a COPY instruction as its first instruction. This should |
- // cause an error to be reported, not a debug check failure. |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
-} |
-#endif // GTEST_HAS_DEATH_TEST |
- |
-TEST_F(VCDiffAddressCacheTest, DecodeAddressPastHereAddress) { |
- ManualEncodeVarint(0xCAFE); |
- BeginDecode(); |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x1000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, HereModeAddressTooLarge) { |
- ManualEncodeVarint(0x10001); // here_address + 1 |
- BeginDecode(); |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x10000, |
- VCD_HERE_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, NearModeAddressOverflow) { |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(0x7FFFFFFF); |
- BeginDecode(); |
- EXPECT_EQ(0xCAFE, cache_.DecodeAddress(0x10000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- // Now decode a NEAR mode address of base address 0xCAFE |
- // (the first decoded address) + offset 0x7FFFFFFF. This will cause |
- // an integer overflow and should signal an error. |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x10000000, |
- cache_.FirstNearMode(), |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
-} |
- |
-// A Varint should contain at most 9 bytes that have their continuation bit |
-// (the uppermost, or 7 bit) set. A longer string of bytes that all have |
-// bit 7 set is not a valid Varint. Try to parse such a string as a Varint |
-// and confirm that it does not run off the end of the input buffer and |
-// it returns an error value (RESULT_ERROR). |
-// |
-TEST_F(VCDiffAddressCacheTest, DecodeInvalidVarint) { |
- address_stream_.clear(); |
- // Write 512 0xFE bytes |
- address_stream_.append(512, static_cast<char>(0xFE)); |
- BeginDecode(); |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x10000000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
-} |
- |
-// If only part of a Varint appears in the data to be decoded, |
-// then DecodeAddress should return RESULT_END_OF_DATA, |
-// which means that the Varint *may* be valid if there is more |
-// data expected to be returned. |
-// |
-TEST_F(VCDiffAddressCacheTest, DecodePartialVarint) { |
- address_stream_.clear(); |
- ManualEncodeByte(0xFE); |
- ManualEncodeByte(0xFE); |
- ManualEncodeByte(0xFE); |
- BeginDecode(); |
- EXPECT_EQ(RESULT_END_OF_DATA, |
- cache_.DecodeAddress(0x10000000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); // Should not modify decode_position_ |
- // Now add the missing last byte (supposedly read from a stream of data) |
- // and verify that the Varint is now valid. |
- ManualEncodeByte(0x01); // End the Varint with an additional byte |
- BeginDecode(); // Reset read position to start of data |
- EXPECT_EQ(0xFDFBF01, |
- cache_.DecodeAddress(0x10000000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(4); // ManualEncodeByte was called for 4 byte values |
-} |
- |
-#ifdef GTEST_HAS_DEATH_TEST |
-TEST_F(VCDiffAddressCacheDeathTest, DecodeBadMode) { |
- ManualEncodeVarint(0xCAFE); |
- BeginDecode(); |
- EXPECT_DEBUG_DEATH(EXPECT_EQ(RESULT_ERROR, |
- cache_.DecodeAddress(0x10000, |
- cache_.LastMode() + 1, |
- &decode_position_, |
- decode_position_end_)), |
- "maximum"); |
- ExpectDecodedSizeInBytes(0); |
-} |
-#endif // GTEST_HAS_DEATH_TEST |
- |
-TEST_F(VCDiffAddressCacheTest, DecodeInvalidHereAddress) { |
- ManualEncodeVarint(0x10001); // offset larger than here_address |
- BeginDecode(); |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x10000, |
- VCD_HERE_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, DecodeInvalidNearAddress) { |
- ManualEncodeVarint(0xCAFE); |
- ManualEncodeVarint(INT_MAX); // offset will cause integer overflow |
- BeginDecode(); |
- EXPECT_EQ(0xCAFE, |
- cache_.DecodeAddress(0x10000, |
- VCD_SELF_MODE, |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(VarintBE<VCDAddress>::Length(0xCAFE)); |
- EXPECT_EQ(RESULT_ERROR, cache_.DecodeAddress(0x10000, |
- cache_.FirstNearMode(), |
- &decode_position_, |
- decode_position_end_)); |
- ExpectDecodedSizeInBytes(0); |
-} |
- |
-void VCDiffAddressCacheTest::BM_Setup(int test_size, bool print_stats) { |
- mode_stream_.resize(test_size); |
- verify_stream_.resize(test_size); |
- VCDAddress here_address = 1; |
- srand(1); |
- for (int i = 0; i < test_size; ++i) { |
- verify_stream_[i] = PortableRandomInRange(here_address - 1); |
- here_address += 4; |
- } |
- BM_CacheEncode(1, test_size); // populate large_address_stream_, mode_stream_ |
- const size_t encoded_size_ = large_address_stream_.size(); |
- if (print_stats) { |
- // Count the percentages of modes used |
- int self_count = 0, here_count = 0, near_count = 0, same_count = 0; |
- for (int i = 0; i < test_size; ++i) { |
- if (mode_stream_[i] == VCD_SELF_MODE) { |
- ++self_count; |
- } else if (mode_stream_[i] == VCD_HERE_MODE) { |
- ++here_count; |
- } else if (mode_stream_[i] < cache_.FirstSameMode()) { |
- ++near_count; |
- } else { |
- ++same_count; |
- } |
- } |
- const int original_bytes = test_size * sizeof(verify_stream_[0]); |
- const int mode_bytes = test_size * sizeof(mode_stream_[0]); |
- double percent_compression = |
- ((1 - (static_cast<double>(encoded_size_ + mode_bytes) / original_bytes)) |
- * 100); |
- LOG(INFO) << "Encoded " << test_size << " addresses (" |
- << original_bytes << " bytes) into " |
- << encoded_size_ << " address bytes + " |
- << mode_bytes << " mode bytes: " |
- << percent_compression << "% compression" << LOG_ENDL; |
- LOG(INFO) << "SELF mode: " << self_count << " (" |
- << ((static_cast<double>(self_count) / test_size) * 100) << "%); " |
- << "HERE mode: " << here_count << " (" |
- << ((static_cast<double>(here_count) / test_size) * 100) << "%); " |
- << "NEAR mode: " << near_count << " (" |
- << ((static_cast<double>(near_count) / test_size) * 100) << "%); " |
- << "SAME mode: " << same_count << " (" |
- << ((static_cast<double>(same_count) / test_size) * 100) << "%)" |
- << LOG_ENDL; |
- } |
-} |
- |
-void VCDiffAddressCacheTest::BM_CacheEncode(int iterations, int test_size) { |
- VCDAddress here_address = 1; |
- VCDAddress encoded_addr = 0; |
- for (int test_iteration = 0; test_iteration < iterations; ++test_iteration) { |
- cache_.Init(); |
- large_address_stream_.clear(); |
- here_address = 1; |
- for (int i = 0; i < test_size; ++i) { |
- const unsigned char mode = cache_.EncodeAddress(verify_stream_[i], |
- here_address, |
- &encoded_addr); |
- if (cache_.WriteAddressAsVarintForMode(mode)) { |
- VarintBE<VCDAddress>::AppendToString(encoded_addr, |
- &large_address_stream_); |
- } else { |
- EXPECT_GT(256, encoded_addr); |
- large_address_stream_.push_back( |
- static_cast<unsigned char>(encoded_addr)); |
- } |
- mode_stream_[i] = mode; |
- here_address += 4; |
- } |
- } |
-} |
- |
-void VCDiffAddressCacheTest::BM_CacheDecode(int iterations, int test_size) { |
- VCDAddress here_address = 1; |
- for (int test_iteration = 0; test_iteration < iterations; ++test_iteration) { |
- cache_.Init(); |
- const char* large_decode_pointer = large_address_stream_.data(); |
- const char* const end_of_encoded_data = |
- large_decode_pointer + large_address_stream_.size(); |
- here_address = 1; |
- for (int i = 0; i < test_size; ++i) { |
- EXPECT_EQ(verify_stream_[i], |
- cache_.DecodeAddress(here_address, |
- mode_stream_[i], |
- &large_decode_pointer, |
- end_of_encoded_data)); |
- here_address += 4; |
- } |
- EXPECT_EQ(end_of_encoded_data, large_decode_pointer); |
- } |
-} |
- |
-TEST_F(VCDiffAddressCacheTest, PerformanceTest) { |
- const int test_size = 20 * 1024; // 20K random encode/decode operations |
- const int num_iterations = 40; // run test 40 times and take average |
- BM_Setup(test_size, true); |
- { |
- CycleTimer encode_timer; |
- encode_timer.Start(); |
- BM_CacheEncode(num_iterations, test_size); |
- encode_timer.Stop(); |
- double encode_time_in_ms = |
- static_cast<double>(encode_timer.GetInUsec()) / 1000; |
- LOG(INFO) << "Time to encode: " |
- << (encode_time_in_ms / num_iterations) << " ms" << LOG_ENDL; |
- } |
- { |
- CycleTimer decode_timer; |
- decode_timer.Start(); |
- BM_CacheDecode(num_iterations, test_size); |
- decode_timer.Stop(); |
- double decode_time_in_ms = |
- static_cast<double>(decode_timer.GetInUsec()) / 1000; |
- LOG(INFO) << "Time to decode: " |
- << (decode_time_in_ms / num_iterations) << " ms" << LOG_ENDL; |
- } |
-} |
- |
-} // unnamed namespace |
-} // namespace open_vcdiff |