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llvm-mirror/unittests/ADT/HashingTest.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

395 lines
17 KiB
C++

//===- llvm/unittest/ADT/HashingTest.cpp ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Hashing.h unit tests.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Hashing.h"
#include "llvm/Support/DataTypes.h"
#include "gtest/gtest.h"
#include <deque>
#include <list>
#include <map>
#include <vector>
namespace llvm {
// Helper for test code to print hash codes.
void PrintTo(const hash_code &code, std::ostream *os) {
*os << static_cast<size_t>(code);
}
// Fake an object that is recognized as hashable data to test super large
// objects.
struct LargeTestInteger { uint64_t arr[8]; };
struct NonPOD {
uint64_t x, y;
NonPOD(uint64_t x, uint64_t y) : x(x), y(y) {}
friend hash_code hash_value(const NonPOD &obj) {
return hash_combine(obj.x, obj.y);
}
};
namespace hashing {
namespace detail {
template <> struct is_hashable_data<LargeTestInteger> : std::true_type {};
} // namespace detail
} // namespace hashing
} // namespace llvm
using namespace llvm;
namespace {
enum TestEnumeration {
TE_Foo = 42,
TE_Bar = 43
};
TEST(HashingTest, HashValueBasicTest) {
int x = 42, y = 43, c = 'x';
void *p = nullptr;
uint64_t i = 71;
const unsigned ci = 71;
volatile int vi = 71;
const volatile int cvi = 71;
uintptr_t addr = reinterpret_cast<uintptr_t>(&y);
EXPECT_EQ(hash_value(42), hash_value(x));
EXPECT_EQ(hash_value(42), hash_value(TE_Foo));
EXPECT_NE(hash_value(42), hash_value(y));
EXPECT_NE(hash_value(42), hash_value(TE_Bar));
EXPECT_NE(hash_value(42), hash_value(p));
EXPECT_EQ(hash_value(71), hash_value(i));
EXPECT_EQ(hash_value(71), hash_value(ci));
EXPECT_EQ(hash_value(71), hash_value(vi));
EXPECT_EQ(hash_value(71), hash_value(cvi));
EXPECT_EQ(hash_value(c), hash_value('x'));
EXPECT_EQ(hash_value('4'), hash_value('0' + 4));
EXPECT_EQ(hash_value(addr), hash_value(&y));
}
TEST(HashingTest, HashValueStdPair) {
EXPECT_EQ(hash_combine(42, 43), hash_value(std::make_pair(42, 43)));
EXPECT_NE(hash_combine(43, 42), hash_value(std::make_pair(42, 43)));
EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42ull, 43ull)));
EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42, 43ull)));
EXPECT_NE(hash_combine(42, 43), hash_value(std::make_pair(42ull, 43)));
// Note that pairs are implicitly flattened to a direct sequence of data and
// hashed efficiently as a consequence.
EXPECT_EQ(hash_combine(42, 43, 44),
hash_value(std::make_pair(42, std::make_pair(43, 44))));
EXPECT_EQ(hash_value(std::make_pair(42, std::make_pair(43, 44))),
hash_value(std::make_pair(std::make_pair(42, 43), 44)));
// Ensure that pairs which have padding bytes *inside* them don't get treated
// this way.
EXPECT_EQ(hash_combine('0', hash_combine(1ull, '2')),
hash_value(std::make_pair('0', std::make_pair(1ull, '2'))));
// Ensure that non-POD pairs don't explode the traits used.
NonPOD obj1(1, 2), obj2(3, 4), obj3(5, 6);
EXPECT_EQ(hash_combine(obj1, hash_combine(obj2, obj3)),
hash_value(std::make_pair(obj1, std::make_pair(obj2, obj3))));
}
TEST(HashingTest, HashValueStdString) {
std::string s = "Hello World!";
EXPECT_EQ(hash_combine_range(s.c_str(), s.c_str() + s.size()), hash_value(s));
EXPECT_EQ(hash_combine_range(s.c_str(), s.c_str() + s.size() - 1),
hash_value(s.substr(0, s.size() - 1)));
EXPECT_EQ(hash_combine_range(s.c_str() + 1, s.c_str() + s.size() - 1),
hash_value(s.substr(1, s.size() - 2)));
std::wstring ws = L"Hello Wide World!";
EXPECT_EQ(hash_combine_range(ws.c_str(), ws.c_str() + ws.size()),
hash_value(ws));
EXPECT_EQ(hash_combine_range(ws.c_str(), ws.c_str() + ws.size() - 1),
hash_value(ws.substr(0, ws.size() - 1)));
EXPECT_EQ(hash_combine_range(ws.c_str() + 1, ws.c_str() + ws.size() - 1),
hash_value(ws.substr(1, ws.size() - 2)));
}
template <typename T, size_t N> T *begin(T (&arr)[N]) { return arr; }
template <typename T, size_t N> T *end(T (&arr)[N]) { return arr + N; }
// Provide a dummy, hashable type designed for easy verification: its hash is
// the same as its value.
struct HashableDummy { size_t value; };
hash_code hash_value(HashableDummy dummy) { return dummy.value; }
TEST(HashingTest, HashCombineRangeBasicTest) {
// Leave this uninitialized in the hope that valgrind will catch bad reads.
int dummy;
hash_code dummy_hash = hash_combine_range(&dummy, &dummy);
EXPECT_NE(hash_code(0), dummy_hash);
const int arr1[] = { 1, 2, 3 };
hash_code arr1_hash = hash_combine_range(begin(arr1), end(arr1));
EXPECT_NE(dummy_hash, arr1_hash);
EXPECT_EQ(arr1_hash, hash_combine_range(begin(arr1), end(arr1)));
const std::vector<int> vec(begin(arr1), end(arr1));
EXPECT_EQ(arr1_hash, hash_combine_range(vec.begin(), vec.end()));
const std::list<int> list(begin(arr1), end(arr1));
EXPECT_EQ(arr1_hash, hash_combine_range(list.begin(), list.end()));
const std::deque<int> deque(begin(arr1), end(arr1));
EXPECT_EQ(arr1_hash, hash_combine_range(deque.begin(), deque.end()));
const int arr2[] = { 3, 2, 1 };
hash_code arr2_hash = hash_combine_range(begin(arr2), end(arr2));
EXPECT_NE(dummy_hash, arr2_hash);
EXPECT_NE(arr1_hash, arr2_hash);
const int arr3[] = { 1, 1, 2, 3 };
hash_code arr3_hash = hash_combine_range(begin(arr3), end(arr3));
EXPECT_NE(dummy_hash, arr3_hash);
EXPECT_NE(arr1_hash, arr3_hash);
const int arr4[] = { 1, 2, 3, 3 };
hash_code arr4_hash = hash_combine_range(begin(arr4), end(arr4));
EXPECT_NE(dummy_hash, arr4_hash);
EXPECT_NE(arr1_hash, arr4_hash);
const size_t arr5[] = { 1, 2, 3 };
const HashableDummy d_arr5[] = { {1}, {2}, {3} };
hash_code arr5_hash = hash_combine_range(begin(arr5), end(arr5));
hash_code d_arr5_hash = hash_combine_range(begin(d_arr5), end(d_arr5));
EXPECT_EQ(arr5_hash, d_arr5_hash);
}
TEST(HashingTest, HashCombineRangeLengthDiff) {
// Test that as only the length varies, we compute different hash codes for
// sequences.
std::map<size_t, size_t> code_to_size;
std::vector<char> all_one_c(256, '\xff');
for (unsigned Idx = 1, Size = all_one_c.size(); Idx < Size; ++Idx) {
hash_code code = hash_combine_range(&all_one_c[0], &all_one_c[0] + Idx);
std::map<size_t, size_t>::iterator
I = code_to_size.insert(std::make_pair(code, Idx)).first;
EXPECT_EQ(Idx, I->second);
}
code_to_size.clear();
std::vector<char> all_zero_c(256, '\0');
for (unsigned Idx = 1, Size = all_zero_c.size(); Idx < Size; ++Idx) {
hash_code code = hash_combine_range(&all_zero_c[0], &all_zero_c[0] + Idx);
std::map<size_t, size_t>::iterator
I = code_to_size.insert(std::make_pair(code, Idx)).first;
EXPECT_EQ(Idx, I->second);
}
code_to_size.clear();
std::vector<unsigned> all_one_int(512, -1);
for (unsigned Idx = 1, Size = all_one_int.size(); Idx < Size; ++Idx) {
hash_code code = hash_combine_range(&all_one_int[0], &all_one_int[0] + Idx);
std::map<size_t, size_t>::iterator
I = code_to_size.insert(std::make_pair(code, Idx)).first;
EXPECT_EQ(Idx, I->second);
}
code_to_size.clear();
std::vector<unsigned> all_zero_int(512, 0);
for (unsigned Idx = 1, Size = all_zero_int.size(); Idx < Size; ++Idx) {
hash_code code = hash_combine_range(&all_zero_int[0], &all_zero_int[0] + Idx);
std::map<size_t, size_t>::iterator
I = code_to_size.insert(std::make_pair(code, Idx)).first;
EXPECT_EQ(Idx, I->second);
}
}
TEST(HashingTest, HashCombineRangeGoldenTest) {
struct { const char *s; uint64_t hash; } golden_data[] = {
#if SIZE_MAX == UINT64_MAX || SIZE_MAX == UINT32_MAX
{ "a", 0xaeb6f9d5517c61f8ULL },
{ "ab", 0x7ab1edb96be496b4ULL },
{ "abc", 0xe38e60bf19c71a3fULL },
{ "abcde", 0xd24461a66de97f6eULL },
{ "abcdefgh", 0x4ef872ec411dec9dULL },
{ "abcdefghijklm", 0xe8a865539f4eadfeULL },
{ "abcdefghijklmnopqrstu", 0x261cdf85faaf4e79ULL },
{ "abcdefghijklmnopqrstuvwxyzabcdef", 0x43ba70e4198e3b2aULL },
{ "abcdefghijklmnopqrstuvwxyzabcdef"
"abcdefghijklmnopqrstuvwxyzghijkl"
"abcdefghijklmnopqrstuvwxyzmnopqr"
"abcdefghijklmnopqrstuvwxyzstuvwx"
"abcdefghijklmnopqrstuvwxyzyzabcd", 0xdcd57fb2afdf72beULL },
{ "a", 0xaeb6f9d5517c61f8ULL },
{ "aa", 0xf2b3b69a9736a1ebULL },
{ "aaa", 0xf752eb6f07b1cafeULL },
{ "aaaaa", 0x812bd21e1236954cULL },
{ "aaaaaaaa", 0xff07a2cff08ac587ULL },
{ "aaaaaaaaaaaaa", 0x84ac949d54d704ecULL },
{ "aaaaaaaaaaaaaaaaaaaaa", 0xcb2c8fb6be8f5648ULL },
{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0xcc40ab7f164091b6ULL },
{ "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 0xc58e174c1e78ffe9ULL },
{ "z", 0x1ba160d7e8f8785cULL },
{ "zz", 0x2c5c03172f1285d7ULL },
{ "zzz", 0x9d2c4f4b507a2ac3ULL },
{ "zzzzz", 0x0f03b9031735693aULL },
{ "zzzzzzzz", 0xe674147c8582c08eULL },
{ "zzzzzzzzzzzzz", 0x3162d9fa6938db83ULL },
{ "zzzzzzzzzzzzzzzzzzzzz", 0x37b9a549e013620cULL },
{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0x8921470aff885016ULL },
{ "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz", 0xf60fdcd9beb08441ULL },
{ "a", 0xaeb6f9d5517c61f8ULL },
{ "ab", 0x7ab1edb96be496b4ULL },
{ "aba", 0x3edb049950884d0aULL },
{ "ababa", 0x8f2de9e73a97714bULL },
{ "abababab", 0xee14a29ddf0ce54cULL },
{ "ababababababa", 0x38b3ddaada2d52b4ULL },
{ "ababababababababababa", 0xd3665364219f2b85ULL },
{ "abababababababababababababababab", 0xa75cd6afbf1bc972ULL },
{ "abababababababababababababababab"
"abababababababababababababababab"
"abababababababababababababababab"
"abababababababababababababababab"
"abababababababababababababababab", 0x840192d129f7a22bULL }
#else
#error This test only supports 64-bit and 32-bit systems.
#endif
};
for (unsigned i = 0; i < sizeof(golden_data)/sizeof(*golden_data); ++i) {
StringRef str = golden_data[i].s;
hash_code hash = hash_combine_range(str.begin(), str.end());
#if 0 // Enable this to generate paste-able text for the above structure.
std::string member_str = "\"" + str.str() + "\",";
fprintf(stderr, " { %-35s 0x%016llxULL },\n",
member_str.c_str(), static_cast<uint64_t>(hash));
#endif
EXPECT_EQ(static_cast<size_t>(golden_data[i].hash),
static_cast<size_t>(hash));
}
}
TEST(HashingTest, HashCombineBasicTest) {
// Hashing a sequence of homogenous types matches range hashing.
const int i1 = 42, i2 = 43, i3 = 123, i4 = 999, i5 = 0, i6 = 79;
const int arr1[] = { i1, i2, i3, i4, i5, i6 };
EXPECT_EQ(hash_combine_range(arr1, arr1 + 1), hash_combine(i1));
EXPECT_EQ(hash_combine_range(arr1, arr1 + 2), hash_combine(i1, i2));
EXPECT_EQ(hash_combine_range(arr1, arr1 + 3), hash_combine(i1, i2, i3));
EXPECT_EQ(hash_combine_range(arr1, arr1 + 4), hash_combine(i1, i2, i3, i4));
EXPECT_EQ(hash_combine_range(arr1, arr1 + 5),
hash_combine(i1, i2, i3, i4, i5));
EXPECT_EQ(hash_combine_range(arr1, arr1 + 6),
hash_combine(i1, i2, i3, i4, i5, i6));
// Hashing a sequence of heterogeneous types which *happen* to all produce the
// same data for hashing produces the same as a range-based hash of the
// fundamental values.
const size_t s1 = 1024, s2 = 8888, s3 = 9000000;
const HashableDummy d1 = { 1024 }, d2 = { 8888 }, d3 = { 9000000 };
const size_t arr2[] = { s1, s2, s3 };
EXPECT_EQ(hash_combine_range(begin(arr2), end(arr2)),
hash_combine(s1, s2, s3));
EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(s1, s2, d3));
EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(s1, d2, s3));
EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, s2, s3));
EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, d2, s3));
EXPECT_EQ(hash_combine(s1, s2, s3), hash_combine(d1, d2, d3));
// Permuting values causes hashes to change.
EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i1, i1, i2));
EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i1, i2, i1));
EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i1, i1));
EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i2, i1));
EXPECT_NE(hash_combine(i1, i1, i1), hash_combine(i2, i2, i2));
EXPECT_NE(hash_combine(i2, i1, i1), hash_combine(i1, i1, i2));
EXPECT_NE(hash_combine(i1, i1, i2), hash_combine(i1, i2, i1));
EXPECT_NE(hash_combine(i1, i2, i1), hash_combine(i2, i1, i1));
// Changing type w/o changing value causes hashes to change.
EXPECT_NE(hash_combine(i1, i2, i3), hash_combine((char)i1, i2, i3));
EXPECT_NE(hash_combine(i1, i2, i3), hash_combine(i1, (char)i2, i3));
EXPECT_NE(hash_combine(i1, i2, i3), hash_combine(i1, i2, (char)i3));
// This is array of uint64, but it should have the exact same byte pattern as
// an array of LargeTestIntegers.
const uint64_t bigarr[] = {
0xaaaaaaaaababababULL, 0xacacacacbcbcbcbcULL, 0xccddeeffeeddccbbULL,
0xdeadbeafdeadbeefULL, 0xfefefefededededeULL, 0xafafafafededededULL,
0xffffeeeeddddccccULL, 0xaaaacbcbffffababULL,
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]));
}
TEST(HashingTest, HashCombineArgs18) {
// This tests that we can pass in up to 18 args.
#define CHECK_SAME(...) \
EXPECT_EQ(hash_combine(__VA_ARGS__), hash_combine(__VA_ARGS__))
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8, 9);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7, 8);
CHECK_SAME(1, 2, 3, 4, 5, 6, 7);
CHECK_SAME(1, 2, 3, 4, 5, 6);
CHECK_SAME(1, 2, 3, 4, 5);
CHECK_SAME(1, 2, 3, 4);
CHECK_SAME(1, 2, 3);
CHECK_SAME(1, 2);
CHECK_SAME(1);
#undef CHECK_SAME
}
}