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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/base/functional.h"
#include <limits>
#include <set>
#include "test/unittests/test-utils.h"
namespace v8 {
namespace base {
TEST(FunctionalTest, HashBool) {
hash<bool> h, h1, h2;
EXPECT_EQ(h1(true), h2(true));
EXPECT_EQ(h1(false), h2(false));
EXPECT_NE(h(true), h(false));
}
TEST(FunctionalTest, HashFloatZero) {
hash<float> h;
EXPECT_EQ(h(0.0f), h(-0.0f));
}
TEST(FunctionalTest, HashDoubleZero) {
hash<double> h;
EXPECT_EQ(h(0.0), h(-0.0));
}
namespace {
inline int64_t GetRandomSeedFromFlag(int random_seed) {
return random_seed ? random_seed : TimeTicks::Now().ToInternalValue();
}
} // namespace
template <typename T>
class FunctionalTest : public ::testing::Test {
public:
FunctionalTest()
: rng_(GetRandomSeedFromFlag(::v8::internal::FLAG_random_seed)) {}
~FunctionalTest() override = default;
FunctionalTest(const FunctionalTest&) = delete;
FunctionalTest& operator=(const FunctionalTest&) = delete;
RandomNumberGenerator* rng() { return &rng_; }
private:
RandomNumberGenerator rng_;
};
using FunctionalTypes =
::testing::Types<signed char, unsigned char,
short, // NOLINT(runtime/int)
unsigned short, // NOLINT(runtime/int)
int, unsigned int, long, // NOLINT(runtime/int)
unsigned long, // NOLINT(runtime/int)
long long, // NOLINT(runtime/int)
unsigned long long, // NOLINT(runtime/int)
int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t,
int64_t, uint64_t, float, double>;
TYPED_TEST_SUITE(FunctionalTest, FunctionalTypes);
TYPED_TEST(FunctionalTest, EqualToImpliesSameHashCode) {
hash<TypeParam> h;
std::equal_to<TypeParam> e;
TypeParam values[32];
this->rng()->NextBytes(values, sizeof(values));
TRACED_FOREACH(TypeParam, v1, values) {
TRACED_FOREACH(TypeParam, v2, values) {
if (e(v1, v2)) {
EXPECT_EQ(h(v1), h(v2));
}
}
}
}
TYPED_TEST(FunctionalTest, HashEqualsHashValue) {
for (int i = 0; i < 128; ++i) {
TypeParam v;
this->rng()->NextBytes(&v, sizeof(v));
hash<TypeParam> h;
EXPECT_EQ(h(v), hash_value(v));
}
}
TYPED_TEST(FunctionalTest, HashIsStateless) {
hash<TypeParam> h1, h2;
for (int i = 0; i < 128; ++i) {
TypeParam v;
this->rng()->NextBytes(&v, sizeof(v));
EXPECT_EQ(h1(v), h2(v));
}
}
TYPED_TEST(FunctionalTest, HashIsOkish) {
std::set<TypeParam> vs;
for (size_t i = 0; i < 128; ++i) {
TypeParam v;
this->rng()->NextBytes(&v, sizeof(v));
vs.insert(v);
}
std::set<size_t> hs;
for (const auto& v : vs) {
hash<TypeParam> h;
hs.insert(h(v));
}
EXPECT_LE(vs.size() / 4u, hs.size());
}
TYPED_TEST(FunctionalTest, HashValueArrayUsesHashRange) {
TypeParam values[128];
this->rng()->NextBytes(&values, sizeof(values));
EXPECT_EQ(hash_range(values, values + arraysize(values)), hash_value(values));
}
TYPED_TEST(FunctionalTest, BitEqualTo) {
bit_equal_to<TypeParam> pred;
for (size_t i = 0; i < 128; ++i) {
TypeParam v1, v2;
this->rng()->NextBytes(&v1, sizeof(v1));
this->rng()->NextBytes(&v2, sizeof(v2));
EXPECT_PRED2(pred, v1, v1);
EXPECT_PRED2(pred, v2, v2);
EXPECT_EQ(memcmp(&v1, &v2, sizeof(TypeParam)) == 0, pred(v1, v2));
}
}
TYPED_TEST(FunctionalTest, BitEqualToImpliesSameBitHash) {
bit_hash<TypeParam> h;
bit_equal_to<TypeParam> e;
TypeParam values[32];
this->rng()->NextBytes(&values, sizeof(values));
TRACED_FOREACH(TypeParam, v1, values) {
TRACED_FOREACH(TypeParam, v2, values) {
if (e(v1, v2)) {
EXPECT_EQ(h(v1), h(v2));
}
}
}
}
namespace {
struct Foo {
int x;
double y;
};
size_t hash_value(Foo const& v) { return hash_combine(v.x, v.y); }
} // namespace
TEST(FunctionalTest, HashUsesArgumentDependentLookup) {
const int kIntValues[] = {std::numeric_limits<int>::min(), -1, 0, 1, 42,
std::numeric_limits<int>::max()};
const double kDoubleValues[] = {
std::numeric_limits<double>::min(), -1, -0, 0, 1,
std::numeric_limits<double>::max()};
TRACED_FOREACH(int, x, kIntValues) {
TRACED_FOREACH(double, y, kDoubleValues) {
hash<Foo> h;
Foo foo = {x, y};
EXPECT_EQ(hash_combine(x, y), h(foo));
}
}
}
TEST(FunctionalTest, BitEqualToFloat) {
bit_equal_to<float> pred;
EXPECT_FALSE(pred(0.0f, -0.0f));
EXPECT_FALSE(pred(-0.0f, 0.0f));
float const qNaN = std::numeric_limits<float>::quiet_NaN();
float const sNaN = std::numeric_limits<float>::signaling_NaN();
EXPECT_PRED2(pred, qNaN, qNaN);
EXPECT_PRED2(pred, sNaN, sNaN);
}
TEST(FunctionalTest, BitHashFloatDifferentForZeroAndMinusZero) {
bit_hash<float> h;
EXPECT_NE(h(0.0f), h(-0.0f));
}
TEST(FunctionalTest, BitEqualToDouble) {
bit_equal_to<double> pred;
EXPECT_FALSE(pred(0.0, -0.0));
EXPECT_FALSE(pred(-0.0, 0.0));
double const qNaN = std::numeric_limits<double>::quiet_NaN();
double const sNaN = std::numeric_limits<double>::signaling_NaN();
EXPECT_PRED2(pred, qNaN, qNaN);
EXPECT_PRED2(pred, sNaN, sNaN);
}
TEST(FunctionalTest, BitHashDoubleDifferentForZeroAndMinusZero) {
bit_hash<double> h;
EXPECT_NE(h(0.0), h(-0.0));
}
} // namespace base
} // namespace v8
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