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// Copyright (c) 2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <span.h>
#include <support/allocators/pool.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/util/poolresourcetester.h>
#include <test/util/xoroshiro128plusplus.h>
#include <cstdint>
#include <tuple>
#include <vector>
namespace {
template <std::size_t MAX_BLOCK_SIZE_BYTES, std::size_t ALIGN_BYTES>
class PoolResourceFuzzer
{
FuzzedDataProvider& m_provider;
PoolResource<MAX_BLOCK_SIZE_BYTES, ALIGN_BYTES> m_test_resource;
uint64_t m_sequence{0};
size_t m_total_allocated{};
struct Entry {
Span<std::byte> span;
size_t alignment;
uint64_t seed;
Entry(Span<std::byte> s, size_t a, uint64_t se) : span(s), alignment(a), seed(se) {}
};
std::vector<Entry> m_entries;
public:
PoolResourceFuzzer(FuzzedDataProvider& provider)
: m_provider{provider},
m_test_resource{provider.ConsumeIntegralInRange<size_t>(MAX_BLOCK_SIZE_BYTES, 262144)}
{
}
void Allocate(size_t size, size_t alignment)
{
assert(size > 0); // Must allocate at least 1 byte.
assert(alignment > 0); // Alignment must be at least 1.
assert((alignment & (alignment - 1)) == 0); // Alignment must be power of 2.
assert((size & (alignment - 1)) == 0); // Size must be a multiple of alignment.
auto span = Span(static_cast<std::byte*>(m_test_resource.Allocate(size, alignment)), size);
m_total_allocated += size;
auto ptr_val = reinterpret_cast<std::uintptr_t>(span.data());
assert((ptr_val & (alignment - 1)) == 0);
uint64_t seed = m_sequence++;
RandomContentFill(m_entries.emplace_back(span, alignment, seed));
}
void
Allocate()
{
if (m_total_allocated > 0x1000000) return;
size_t alignment_bits = m_provider.ConsumeIntegralInRange<size_t>(0, 7);
size_t alignment = 1 << alignment_bits;
size_t size_bits = m_provider.ConsumeIntegralInRange<size_t>(0, 16 - alignment_bits);
size_t size = m_provider.ConsumeIntegralInRange<size_t>(1U << size_bits, (1U << (size_bits + 1)) - 1U) << alignment_bits;
Allocate(size, alignment);
}
void RandomContentFill(Entry& entry)
{
XoRoShiRo128PlusPlus rng(entry.seed);
auto ptr = entry.span.data();
auto size = entry.span.size();
while (size >= 8) {
auto r = rng();
std::memcpy(ptr, &r, 8);
size -= 8;
ptr += 8;
}
if (size > 0) {
auto r = rng();
std::memcpy(ptr, &r, size);
}
}
void RandomContentCheck(const Entry& entry)
{
XoRoShiRo128PlusPlus rng(entry.seed);
auto ptr = entry.span.data();
auto size = entry.span.size();
std::byte buf[8];
while (size >= 8) {
auto r = rng();
std::memcpy(buf, &r, 8);
assert(std::memcmp(buf, ptr, 8) == 0);
size -= 8;
ptr += 8;
}
if (size > 0) {
auto r = rng();
std::memcpy(buf, &r, size);
assert(std::memcmp(buf, ptr, size) == 0);
}
}
void Deallocate(const Entry& entry)
{
auto ptr_val = reinterpret_cast<std::uintptr_t>(entry.span.data());
assert((ptr_val & (entry.alignment - 1)) == 0);
RandomContentCheck(entry);
m_total_allocated -= entry.span.size();
m_test_resource.Deallocate(entry.span.data(), entry.span.size(), entry.alignment);
}
void Deallocate()
{
if (m_entries.empty()) {
return;
}
size_t idx = m_provider.ConsumeIntegralInRange<size_t>(0, m_entries.size() - 1);
Deallocate(m_entries[idx]);
if (idx != m_entries.size() - 1) {
m_entries[idx] = std::move(m_entries.back());
}
m_entries.pop_back();
}
void Clear()
{
while (!m_entries.empty()) {
Deallocate();
}
PoolResourceTester::CheckAllDataAccountedFor(m_test_resource);
}
void Fuzz()
{
LIMITED_WHILE(m_provider.ConsumeBool(), 10000)
{
CallOneOf(
m_provider,
[&] { Allocate(); },
[&] { Deallocate(); });
}
Clear();
}
};
} // namespace
FUZZ_TARGET(pool_resource)
{
FuzzedDataProvider provider(buffer.data(), buffer.size());
CallOneOf(
provider,
[&] { PoolResourceFuzzer<128, 1>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<128, 2>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<128, 4>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<128, 8>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<8, 8>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<16, 16>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<256, alignof(max_align_t)>{provider}.Fuzz(); },
[&] { PoolResourceFuzzer<256, 64>{provider}.Fuzz(); });
}
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