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c7384cfc7a
an open question of whether we can do better than this by treating pairs as boring data containers and directly hashing the two subobjects. This at least makes the API reasonable. In order to make this change, I reorganized the header a bit. I lifted the declarations of the hash_value functions up to the top of the header with their doxygen comments as these are intended for users to interact with. They shouldn't have to wade through implementation details. I then defined them at the very end so that they could be defined in terms of hash_combine or any other hashing infrastructure. Added various pair-hashing unittests. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151882 91177308-0d34-0410-b5e6-96231b3b80d8
377 lines
17 KiB
C++
377 lines
17 KiB
C++
//===- llvm/unittest/ADT/HashingTest.cpp ----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Hashing.h unit tests.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/Support/DataTypes.h"
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#include <deque>
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#include <list>
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#include <map>
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#include <vector>
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namespace llvm {
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// Helper for test code to print hash codes.
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void PrintTo(const hash_code &code, std::ostream *os) {
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*os << static_cast<size_t>(code);
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}
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// Fake an object that is recognized as hashable data to test super large
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// objects.
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struct LargeTestInteger { uint64_t arr[8]; };
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namespace hashing {
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namespace detail {
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template <> struct is_hashable_data<LargeTestInteger> : true_type {};
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} // namespace detail
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} // namespace hashing
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} // namespace llvm
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using namespace llvm;
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namespace {
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TEST(HashingTest, HashValueBasicTest) {
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int x = 42, y = 43, c = 'x';
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void *p = 0;
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uint64_t i = 71;
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const unsigned ci = 71;
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volatile int vi = 71;
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const volatile int cvi = 71;
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uintptr_t addr = reinterpret_cast<uintptr_t>(&y);
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EXPECT_EQ(hash_value(42), hash_value(x));
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EXPECT_NE(hash_value(42), hash_value(y));
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EXPECT_NE(hash_value(42), hash_value(p));
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EXPECT_EQ(hash_value(71), hash_value(i));
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EXPECT_EQ(hash_value(71), hash_value(ci));
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EXPECT_EQ(hash_value(71), hash_value(vi));
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EXPECT_EQ(hash_value(71), hash_value(cvi));
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EXPECT_EQ(hash_value(c), hash_value('x'));
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EXPECT_EQ(hash_value('4'), hash_value('0' + 4));
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EXPECT_EQ(hash_value(addr), hash_value(&y));
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EXPECT_EQ(hash_combine(42, 43), hash_value(std::make_pair(42, 43)));
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EXPECT_NE(hash_combine(43, 42), hash_value(std::make_pair(42, 43)));
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EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42ull, 43ull)));
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EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42, 43ull)));
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EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42ull, 43)));
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EXPECT_EQ(hash_combine(42, hash_combine(43, hash_combine(44, 45))),
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hash_value(
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std::make_pair(42, std::make_pair(43, std::make_pair(44, 45)))));
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EXPECT_EQ(hash_combine(42, 43), hash_value(std::make_pair(42, 43)));
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EXPECT_EQ(hash_combine(42, 43), hash_value(std::make_pair(42, 43)));
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}
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template <typename T, size_t N> T *begin(T (&arr)[N]) { return arr; }
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template <typename T, size_t N> T *end(T (&arr)[N]) { return arr + N; }
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// Provide a dummy, hashable type designed for easy verification: its hash is
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// the same as its value.
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struct HashableDummy { size_t value; };
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hash_code hash_value(HashableDummy dummy) { return dummy.value; }
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TEST(HashingTest, HashCombineRangeBasicTest) {
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// Leave this uninitialized in the hope that valgrind will catch bad reads.
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int dummy;
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hash_code dummy_hash = hash_combine_range(&dummy, &dummy);
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EXPECT_NE(hash_code(0), dummy_hash);
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const int arr1[] = { 1, 2, 3 };
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hash_code arr1_hash = hash_combine_range(begin(arr1), end(arr1));
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EXPECT_NE(dummy_hash, arr1_hash);
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EXPECT_EQ(arr1_hash, hash_combine_range(begin(arr1), end(arr1)));
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const std::vector<int> vec(begin(arr1), end(arr1));
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EXPECT_EQ(arr1_hash, hash_combine_range(vec.begin(), vec.end()));
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const std::list<int> list(begin(arr1), end(arr1));
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EXPECT_EQ(arr1_hash, hash_combine_range(list.begin(), list.end()));
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const std::deque<int> deque(begin(arr1), end(arr1));
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EXPECT_EQ(arr1_hash, hash_combine_range(deque.begin(), deque.end()));
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const int arr2[] = { 3, 2, 1 };
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hash_code arr2_hash = hash_combine_range(begin(arr2), end(arr2));
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EXPECT_NE(dummy_hash, arr2_hash);
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EXPECT_NE(arr1_hash, arr2_hash);
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const int arr3[] = { 1, 1, 2, 3 };
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hash_code arr3_hash = hash_combine_range(begin(arr3), end(arr3));
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EXPECT_NE(dummy_hash, arr3_hash);
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EXPECT_NE(arr1_hash, arr3_hash);
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const int arr4[] = { 1, 2, 3, 3 };
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hash_code arr4_hash = hash_combine_range(begin(arr4), end(arr4));
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EXPECT_NE(dummy_hash, arr4_hash);
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EXPECT_NE(arr1_hash, arr4_hash);
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const size_t arr5[] = { 1, 2, 3 };
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const HashableDummy d_arr5[] = { {1}, {2}, {3} };
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hash_code arr5_hash = hash_combine_range(begin(arr5), end(arr5));
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hash_code d_arr5_hash = hash_combine_range(begin(d_arr5), end(d_arr5));
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EXPECT_EQ(arr5_hash, d_arr5_hash);
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}
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TEST(HashingTest, HashCombineRangeLengthDiff) {
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// Test that as only the length varies, we compute different hash codes for
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// sequences.
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std::map<size_t, size_t> code_to_size;
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std::vector<char> all_one_c(256, '\xff');
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for (unsigned Idx = 1, Size = all_one_c.size(); Idx < Size; ++Idx) {
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hash_code code = hash_combine_range(&all_one_c[0], &all_one_c[0] + Idx);
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std::map<size_t, size_t>::iterator
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I = code_to_size.insert(std::make_pair(code, Idx)).first;
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EXPECT_EQ(Idx, I->second);
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}
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code_to_size.clear();
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std::vector<char> all_zero_c(256, '\0');
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for (unsigned Idx = 1, Size = all_zero_c.size(); Idx < Size; ++Idx) {
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hash_code code = hash_combine_range(&all_zero_c[0], &all_zero_c[0] + Idx);
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std::map<size_t, size_t>::iterator
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I = code_to_size.insert(std::make_pair(code, Idx)).first;
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EXPECT_EQ(Idx, I->second);
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}
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code_to_size.clear();
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std::vector<unsigned> all_one_int(512, -1);
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for (unsigned Idx = 1, Size = all_one_int.size(); Idx < Size; ++Idx) {
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hash_code code = hash_combine_range(&all_one_int[0], &all_one_int[0] + Idx);
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std::map<size_t, size_t>::iterator
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I = code_to_size.insert(std::make_pair(code, Idx)).first;
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EXPECT_EQ(Idx, I->second);
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}
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code_to_size.clear();
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std::vector<unsigned> all_zero_int(512, 0);
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for (unsigned Idx = 1, Size = all_zero_int.size(); Idx < Size; ++Idx) {
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hash_code code = hash_combine_range(&all_zero_int[0], &all_zero_int[0] + Idx);
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std::map<size_t, size_t>::iterator
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I = code_to_size.insert(std::make_pair(code, Idx)).first;
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EXPECT_EQ(Idx, I->second);
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}
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}
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TEST(HashingTest, HashCombineRangeGoldenTest) {
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struct { const char *s; uint64_t hash; } golden_data[] = {
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#if SIZE_MAX == UINT64_MAX
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{ "a", 0xaeb6f9d5517c61f8ULL },
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{ "ab", 0x7ab1edb96be496b4ULL },
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{ "abc", 0xe38e60bf19c71a3fULL },
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{ "abcde", 0xd24461a66de97f6eULL },
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{ "abcdefgh", 0x4ef872ec411dec9dULL },
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{ "abcdefghijklm", 0xe8a865539f4eadfeULL },
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{ "abcdefghijklmnopqrstu", 0x261cdf85faaf4e79ULL },
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{ "abcdefghijklmnopqrstuvwxyzabcdef", 0x43ba70e4198e3b2aULL },
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{ "abcdefghijklmnopqrstuvwxyzabcdef"
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"abcdefghijklmnopqrstuvwxyzghijkl"
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"abcdefghijklmnopqrstuvwxyzmnopqr"
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"abcdefghijklmnopqrstuvwxyzstuvwx"
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"abcdefghijklmnopqrstuvwxyzyzabcd", 0xdcd57fb2afdf72beULL },
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{ "a", 0xaeb6f9d5517c61f8ULL },
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{ "aa", 0xf2b3b69a9736a1ebULL },
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{ "aaa", 0xf752eb6f07b1cafeULL },
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{ "aaaaa", 0x812bd21e1236954cULL },
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{ "aaaaaaaa", 0xff07a2cff08ac587ULL },
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{ "aaaaaaaaaaaaa", 0x84ac949d54d704ecULL },
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{ "aaaaaaaaaaaaaaaaaaaaa", 0xcb2c8fb6be8f5648ULL },
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{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0xcc40ab7f164091b6ULL },
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{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0xc58e174c1e78ffe9ULL },
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{ "z", 0x1ba160d7e8f8785cULL },
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{ "zz", 0x2c5c03172f1285d7ULL },
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{ "zzz", 0x9d2c4f4b507a2ac3ULL },
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{ "zzzzz", 0x0f03b9031735693aULL },
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{ "zzzzzzzz", 0xe674147c8582c08eULL },
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{ "zzzzzzzzzzzzz", 0x3162d9fa6938db83ULL },
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{ "zzzzzzzzzzzzzzzzzzzzz", 0x37b9a549e013620cULL },
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{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0x8921470aff885016ULL },
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{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0xf60fdcd9beb08441ULL },
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{ "a", 0xaeb6f9d5517c61f8ULL },
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{ "ab", 0x7ab1edb96be496b4ULL },
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{ "aba", 0x3edb049950884d0aULL },
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{ "ababa", 0x8f2de9e73a97714bULL },
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{ "abababab", 0xee14a29ddf0ce54cULL },
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{ "ababababababa", 0x38b3ddaada2d52b4ULL },
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{ "ababababababababababa", 0xd3665364219f2b85ULL },
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{ "abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab", 0x840192d129f7a22bULL }
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#elif SIZE_MAX == UINT32_MAX
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{ "a", 0x000000004605f745ULL },
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{ "ab", 0x00000000d5f06301ULL },
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{ "abc", 0x00000000559fe1eeULL },
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{ "abcde", 0x00000000424028d7ULL },
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{ "abcdefgh", 0x000000007bb119f8ULL },
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{ "abcdefghijklm", 0x00000000edbca513ULL },
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{ "abcdefghijklmnopqrstu", 0x000000007c15712eULL },
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{ "abcdefghijklmnopqrstuvwxyzabcdef", 0x000000000b3aad66ULL },
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{ "abcdefghijklmnopqrstuvwxyzabcdef"
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"abcdefghijklmnopqrstuvwxyzghijkl"
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"abcdefghijklmnopqrstuvwxyzmnopqr"
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"abcdefghijklmnopqrstuvwxyzstuvwx"
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"abcdefghijklmnopqrstuvwxyzyzabcd", 0x000000008c758c8bULL },
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{ "a", 0x000000004605f745ULL },
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{ "aa", 0x00000000dc0a52daULL },
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{ "aaa", 0x00000000b309274fULL },
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{ "aaaaa", 0x00000000203b5ef6ULL },
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{ "aaaaaaaa", 0x00000000a429e18fULL },
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{ "aaaaaaaaaaaaa", 0x000000008662070bULL },
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{ "aaaaaaaaaaaaaaaaaaaaa", 0x000000003f11151cULL },
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{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0x000000008600fe20ULL },
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{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0x000000004e0e0804ULL },
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{ "z", 0x00000000c5e405e9ULL },
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{ "zz", 0x00000000a8d8a2c6ULL },
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{ "zzz", 0x00000000fc2af672ULL },
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{ "zzzzz", 0x0000000047d9efe6ULL },
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{ "zzzzzzzz", 0x0000000080d77794ULL },
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{ "zzzzzzzzzzzzz", 0x00000000405f93adULL },
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{ "zzzzzzzzzzzzzzzzzzzzz", 0x00000000fc72838dULL },
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{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0x000000007ce160f1ULL },
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{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
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"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0x00000000aed9ed1bULL },
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{ "a", 0x000000004605f745ULL },
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{ "ab", 0x00000000d5f06301ULL },
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{ "aba", 0x00000000a85cd91bULL },
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{ "ababa", 0x000000009e3bb52eULL },
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{ "abababab", 0x000000002709b3b9ULL },
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{ "ababababababa", 0x000000003a234174ULL },
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{ "ababababababababababa", 0x000000005c63e5ceULL },
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{ "abababababababababababababababab", 0x0000000013f74334ULL },
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{ "abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab"
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"abababababababababababababababab", 0x00000000c1a6f135ULL },
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#else
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#error This test only supports 64-bit and 32-bit systems.
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#endif
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};
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for (unsigned i = 0; i < sizeof(golden_data)/sizeof(*golden_data); ++i) {
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StringRef str = golden_data[i].s;
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hash_code hash = hash_combine_range(str.begin(), str.end());
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#if 0 // Enable this to generate paste-able text for the above structure.
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std::string member_str = "\"" + str.str() + "\",";
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fprintf(stderr, " { %-35s 0x%016llxULL },\n",
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member_str.c_str(), static_cast<uint64_t>(hash));
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#endif
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EXPECT_EQ(static_cast<size_t>(golden_data[i].hash),
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static_cast<size_t>(hash));
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}
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}
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TEST(HashingTest, HashCombineBasicTest) {
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// Hashing a sequence of homogenous types matches range hashing.
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const int i1 = 42, i2 = 43, i3 = 123, i4 = 999, i5 = 0, i6 = 79;
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const int arr1[] = { i1, i2, i3, i4, i5, i6 };
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 1), hash_combine(i1));
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 2), hash_combine(i1, i2));
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 3), hash_combine(i1, i2, i3));
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 4), hash_combine(i1, i2, i3, i4));
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 5),
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hash_combine(i1, i2, i3, i4, i5));
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EXPECT_EQ(hash_combine_range(arr1, arr1 + 6),
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hash_combine(i1, i2, i3, i4, i5, i6));
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// Hashing a sequence of heterogenous types which *happen* to all produce the
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// same data for hashing produces the same as a range-based hash of the
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// fundamental values.
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const size_t s1 = 1024, s2 = 8888, s3 = 9000000;
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const HashableDummy d1 = { 1024 }, d2 = { 8888 }, d3 = { 9000000 };
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const size_t arr2[] = { s1, s2, s3 };
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EXPECT_EQ(hash_combine_range(begin(arr2), end(arr2)),
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hash_combine(s1, s2, s3));
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EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(s1, s2, d3));
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EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(s1, d2, s3));
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EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, s2, s3));
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EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, d2, s3));
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EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, d2, d3));
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// Permuting values causes hashes to change.
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EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i1, i1, i2));
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EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i1, i2, i1));
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EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i1, i1));
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EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i2, i1));
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EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i2, i2));
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EXPECT_NE(hash_combine(i2, i1, i1), hash_combine(i1, i1, i2));
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EXPECT_NE(hash_combine(i1, i1, i2), hash_combine(i1, i2, i1));
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EXPECT_NE(hash_combine(i1, i2, i1), hash_combine(i2, i1, i1));
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// Changing type w/o changing value causes hashes to change.
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EXPECT_NE(hash_combine(i1, i2, i3), hash_combine((char)i1, i2, i3));
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EXPECT_NE(hash_combine(i1, i2, i3), hash_combine(i1, (char)i2, i3));
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EXPECT_NE(hash_combine(i1, i2, i3), hash_combine(i1, i2, (char)i3));
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// This is array of uint64, but it should have the exact same byte pattern as
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// an array of LargeTestIntegers.
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const uint64_t bigarr[] = {
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0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL,
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0xdeadbeafdeadbeefULL, 0xfefefefededededeULL, 0xafafafafededededULL,
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0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL,
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0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL,
|
|
0xdeadbeafdeadbeefULL, 0xfefefefededededeULL, 0xafafafafededededULL,
|
|
0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL,
|
|
0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL,
|
|
0xdeadbeafdeadbeefULL, 0xfefefefededededeULL, 0xafafafafededededULL,
|
|
0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL
|
|
};
|
|
// Hash a preposterously large integer, both aligned with the buffer and
|
|
// misaligned.
|
|
const LargeTestInteger li = { {
|
|
0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL,
|
|
0xdeadbeafdeadbeefULL, 0xfefefefededededeULL, 0xafafafafededededULL,
|
|
0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL
|
|
} };
|
|
// Rotate the storage from 'li'.
|
|
const LargeTestInteger l2 = { {
|
|
0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL, 0xdeadbeafdeadbeefULL,
|
|
0xfefefefededededeULL, 0xafafafafededededULL, 0xffffeeeeddddccccULL,
|
|
0xaaaacbcbffffababULL, 0xaaaaaaaaababababULL
|
|
} };
|
|
const LargeTestInteger l3 = { {
|
|
0xccddeeffeeddccbbULL, 0xdeadbeafdeadbeefULL, 0xfefefefededededeULL,
|
|
0xafafafafededededULL, 0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL,
|
|
0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL
|
|
} };
|
|
EXPECT_EQ(hash_combine_range(begin(bigarr), end(bigarr)),
|
|
hash_combine(li, li, li));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 9),
|
|
hash_combine(bigarr[0], l2));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 10),
|
|
hash_combine(bigarr[0], bigarr[1], l3));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 17),
|
|
hash_combine(li, bigarr[0], l2));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 18),
|
|
hash_combine(li, bigarr[0], bigarr[1], l3));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 18),
|
|
hash_combine(bigarr[0], l2, bigarr[9], l3));
|
|
EXPECT_EQ(hash_combine_range(bigarr, bigarr + 20),
|
|
hash_combine(bigarr[0], l2, bigarr[9], l3, bigarr[18], bigarr[19]));
|
|
}
|
|
|
|
}
|