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//===-- secondary_test.cpp --------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "memtag.h"
#include "tests/scudo_unit_test.h"
#include "allocator_config.h"
#include "secondary.h"
#include <condition_variable>
#include <memory>
#include <mutex>
#include <random>
#include <stdio.h>
#include <thread>
#include <vector>
template <typename Config> static scudo::Options getOptionsForConfig() {
if (!Config::MaySupportMemoryTagging || !scudo::archSupportsMemoryTagging() ||
!scudo::systemSupportsMemoryTagging())
return {};
scudo::AtomicOptions AO;
AO.set(scudo::OptionBit::UseMemoryTagging);
return AO.load();
}
template <typename Config> static void testSecondaryBasic(void) {
using SecondaryT = scudo::MapAllocator<Config>;
scudo::Options Options = getOptionsForConfig<Config>();
scudo::GlobalStats S;
S.init();
std::unique_ptr<SecondaryT> L(new SecondaryT);
L->init(&S);
const scudo::uptr Size = 1U << 16;
void *P = L->allocate(Options, Size);
EXPECT_NE(P, nullptr);
memset(P, 'A', Size);
EXPECT_GE(SecondaryT::getBlockSize(P), Size);
L->deallocate(Options, P);
// If the Secondary can't cache that pointer, it will be unmapped.
if (!L->canCache(Size)) {
EXPECT_DEATH(
{
// Repeat few time to avoid missing crash if it's mmaped by unrelated
// code.
for (int i = 0; i < 10; ++i) {
P = L->allocate(Options, Size);
L->deallocate(Options, P);
memset(P, 'A', Size);
}
},
"");
}
const scudo::uptr Align = 1U << 16;
P = L->allocate(Options, Size + Align, Align);
EXPECT_NE(P, nullptr);
void *AlignedP = reinterpret_cast<void *>(
scudo::roundUpTo(reinterpret_cast<scudo::uptr>(P), Align));
memset(AlignedP, 'A', Size);
L->deallocate(Options, P);
std::vector<void *> V;
for (scudo::uptr I = 0; I < 32U; I++)
V.push_back(L->allocate(Options, Size));
std::shuffle(V.begin(), V.end(), std::mt19937(std::random_device()()));
while (!V.empty()) {
L->deallocate(Options, V.back());
V.pop_back();
}
scudo::ScopedString Str;
L->getStats(&Str);
Str.output();
L->unmapTestOnly();
}
struct NoCacheConfig {
typedef scudo::MapAllocatorNoCache SecondaryCache;
static const bool MaySupportMemoryTagging = false;
};
struct TestConfig {
typedef scudo::MapAllocatorCache<TestConfig> SecondaryCache;
static const bool MaySupportMemoryTagging = false;
static const scudo::u32 SecondaryCacheEntriesArraySize = 128U;
static const scudo::u32 SecondaryCacheQuarantineSize = 0U;
static const scudo::u32 SecondaryCacheDefaultMaxEntriesCount = 64U;
static const scudo::uptr SecondaryCacheDefaultMaxEntrySize = 1UL << 20;
static const scudo::s32 SecondaryCacheMinReleaseToOsIntervalMs = INT32_MIN;
static const scudo::s32 SecondaryCacheMaxReleaseToOsIntervalMs = INT32_MAX;
};
TEST(ScudoSecondaryTest, SecondaryBasic) {
testSecondaryBasic<NoCacheConfig>();
testSecondaryBasic<scudo::DefaultConfig>();
testSecondaryBasic<TestConfig>();
}
struct MapAllocatorTest : public Test {
using Config = scudo::DefaultConfig;
using LargeAllocator = scudo::MapAllocator<Config>;
void SetUp() override { Allocator->init(nullptr); }
void TearDown() override { Allocator->unmapTestOnly(); }
std::unique_ptr<LargeAllocator> Allocator =
std::make_unique<LargeAllocator>();
scudo::Options Options = getOptionsForConfig<Config>();
};
// This exercises a variety of combinations of size and alignment for the
// MapAllocator. The size computation done here mimic the ones done by the
// combined allocator.
TEST_F(MapAllocatorTest, SecondaryCombinations) {
constexpr scudo::uptr MinAlign = FIRST_32_SECOND_64(8, 16);
constexpr scudo::uptr HeaderSize = scudo::roundUpTo(8, MinAlign);
for (scudo::uptr SizeLog = 0; SizeLog <= 20; SizeLog++) {
for (scudo::uptr AlignLog = FIRST_32_SECOND_64(3, 4); AlignLog <= 16;
AlignLog++) {
const scudo::uptr Align = 1U << AlignLog;
for (scudo::sptr Delta = -128; Delta <= 128; Delta += 8) {
if (static_cast<scudo::sptr>(1U << SizeLog) + Delta <= 0)
continue;
const scudo::uptr UserSize =
scudo::roundUpTo((1U << SizeLog) + Delta, MinAlign);
const scudo::uptr Size =
HeaderSize + UserSize + (Align > MinAlign ? Align - HeaderSize : 0);
void *P = Allocator->allocate(Options, Size, Align);
EXPECT_NE(P, nullptr);
void *AlignedP = reinterpret_cast<void *>(
scudo::roundUpTo(reinterpret_cast<scudo::uptr>(P), Align));
memset(AlignedP, 0xff, UserSize);
Allocator->deallocate(Options, P);
}
}
}
scudo::ScopedString Str;
Allocator->getStats(&Str);
Str.output();
}
TEST_F(MapAllocatorTest, SecondaryIterate) {
std::vector<void *> V;
const scudo::uptr PageSize = scudo::getPageSizeCached();
for (scudo::uptr I = 0; I < 32U; I++)
V.push_back(Allocator->allocate(Options, (std::rand() % 16) * PageSize));
auto Lambda = [V](scudo::uptr Block) {
EXPECT_NE(std::find(V.begin(), V.end(), reinterpret_cast<void *>(Block)),
V.end());
};
Allocator->disable();
Allocator->iterateOverBlocks(Lambda);
Allocator->enable();
while (!V.empty()) {
Allocator->deallocate(Options, V.back());
V.pop_back();
}
scudo::ScopedString Str;
Allocator->getStats(&Str);
Str.output();
}
TEST_F(MapAllocatorTest, SecondaryOptions) {
// Attempt to set a maximum number of entries higher than the array size.
EXPECT_FALSE(
Allocator->setOption(scudo::Option::MaxCacheEntriesCount, 4096U));
// A negative number will be cast to a scudo::u32, and fail.
EXPECT_FALSE(Allocator->setOption(scudo::Option::MaxCacheEntriesCount, -1));
if (Allocator->canCache(0U)) {
// Various valid combinations.
EXPECT_TRUE(Allocator->setOption(scudo::Option::MaxCacheEntriesCount, 4U));
EXPECT_TRUE(
Allocator->setOption(scudo::Option::MaxCacheEntrySize, 1UL << 20));
EXPECT_TRUE(Allocator->canCache(1UL << 18));
EXPECT_TRUE(
Allocator->setOption(scudo::Option::MaxCacheEntrySize, 1UL << 17));
EXPECT_FALSE(Allocator->canCache(1UL << 18));
EXPECT_TRUE(Allocator->canCache(1UL << 16));
EXPECT_TRUE(Allocator->setOption(scudo::Option::MaxCacheEntriesCount, 0U));
EXPECT_FALSE(Allocator->canCache(1UL << 16));
EXPECT_TRUE(Allocator->setOption(scudo::Option::MaxCacheEntriesCount, 4U));
EXPECT_TRUE(
Allocator->setOption(scudo::Option::MaxCacheEntrySize, 1UL << 20));
EXPECT_TRUE(Allocator->canCache(1UL << 16));
}
}
struct MapAllocatorWithReleaseTest : public MapAllocatorTest {
void SetUp() override { Allocator->init(nullptr, /*ReleaseToOsInterval=*/0); }
void performAllocations() {
std::vector<void *> V;
const scudo::uptr PageSize = scudo::getPageSizeCached();
{
std::unique_lock<std::mutex> Lock(Mutex);
while (!Ready)
Cv.wait(Lock);
}
for (scudo::uptr I = 0; I < 128U; I++) {
// Deallocate 75% of the blocks.
const bool Deallocate = (rand() & 3) != 0;
void *P = Allocator->allocate(Options, (std::rand() % 16) * PageSize);
if (Deallocate)
Allocator->deallocate(Options, P);
else
V.push_back(P);
}
while (!V.empty()) {
Allocator->deallocate(Options, V.back());
V.pop_back();
}
}
std::mutex Mutex;
std::condition_variable Cv;
bool Ready = false;
};
TEST_F(MapAllocatorWithReleaseTest, SecondaryThreadsRace) {
std::thread Threads[16];
for (scudo::uptr I = 0; I < ARRAY_SIZE(Threads); I++)
Threads[I] =
std::thread(&MapAllocatorWithReleaseTest::performAllocations, this);
{
std::unique_lock<std::mutex> Lock(Mutex);
Ready = true;
Cv.notify_all();
}
for (auto &T : Threads)
T.join();
scudo::ScopedString Str;
Allocator->getStats(&Str);
Str.output();
}
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