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//===-- sanitizer_stack_store_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 "sanitizer_common/sanitizer_stack_store.h"
#include <algorithm>
#include <numeric>
#include <vector>
#include "gtest/gtest.h"
#include "sanitizer_atomic.h"
#include "sanitizer_hash.h"
#include "sanitizer_stacktrace.h"
namespace __sanitizer {
class StackStoreTest : public testing::Test {
protected:
void SetUp() override {}
void TearDown() override { store_.TestOnlyUnmap(); }
template <typename Fn>
void ForEachTrace(Fn fn, uptr n = 1000000) {
std::vector<uptr> frames(kStackTraceMax);
std::iota(frames.begin(), frames.end(), 0x100000);
MurMur2HashBuilder h(0);
for (uptr i = 0; i < n; ++i) {
h.add(i);
u32 size = h.get() % kStackTraceMax;
h.add(i);
uptr tag = h.get() % 256;
StackTrace s(frames.data(), size, tag);
if (!s.size && !s.tag)
continue;
fn(s);
if (HasFailure())
return;
std::next_permutation(frames.begin(), frames.end());
};
}
using BlockInfo = StackStore::BlockInfo;
uptr GetTotalFramesCount() const {
return atomic_load_relaxed(&store_.total_frames_);
}
uptr CountReadyToPackBlocks() {
uptr res = 0;
for (BlockInfo& b : store_.blocks_) res += b.Stored(0);
return res;
}
uptr CountPackedBlocks() const {
uptr res = 0;
for (const BlockInfo& b : store_.blocks_) res += b.IsPacked();
return res;
}
uptr IdToOffset(StackStore::Id id) const { return store_.IdToOffset(id); }
static constexpr uptr kBlockSizeFrames = StackStore::kBlockSizeFrames;
static constexpr uptr kBlockSizeBytes = StackStore::kBlockSizeBytes;
StackStore store_ = {};
};
TEST_F(StackStoreTest, Empty) {
uptr before = store_.Allocated();
uptr pack = 0;
EXPECT_EQ(0u, store_.Store({}, &pack));
uptr after = store_.Allocated();
EXPECT_EQ(before, after);
}
TEST_F(StackStoreTest, Basic) {
std::vector<StackStore::Id> ids;
ForEachTrace([&](const StackTrace& s) {
uptr pack = 0;
ids.push_back(store_.Store(s, &pack));
});
auto id = ids.begin();
ForEachTrace([&](const StackTrace& s) {
StackTrace trace = store_.Load(*(id++));
EXPECT_EQ(s.size, trace.size);
EXPECT_EQ(s.tag, trace.tag);
EXPECT_EQ(std::vector<uptr>(s.trace, s.trace + s.size),
std::vector<uptr>(trace.trace, trace.trace + trace.size));
});
}
TEST_F(StackStoreTest, Allocated) {
EXPECT_LE(store_.Allocated(), 0x100000u);
std::vector<StackStore::Id> ids;
ForEachTrace([&](const StackTrace& s) {
uptr pack = 0;
ids.push_back(store_.Store(s, &pack));
});
EXPECT_NEAR(store_.Allocated(), FIRST_32_SECOND_64(500000000u, 1000000000u),
FIRST_32_SECOND_64(50000000u, 100000000u));
store_.TestOnlyUnmap();
EXPECT_LE(store_.Allocated(), 0x100000u);
}
TEST_F(StackStoreTest, ReadyToPack) {
uptr next_pack = kBlockSizeFrames;
uptr total_ready = 0;
ForEachTrace(
[&](const StackTrace& s) {
uptr pack = 0;
StackStore::Id id = store_.Store(s, &pack);
uptr end_idx = IdToOffset(id) + 1 + s.size;
if (end_idx >= next_pack) {
EXPECT_EQ(1u, pack);
next_pack += kBlockSizeFrames;
} else {
EXPECT_EQ(0u, pack);
}
total_ready += pack;
EXPECT_EQ(CountReadyToPackBlocks(), total_ready);
},
100000);
EXPECT_EQ(GetTotalFramesCount() / kBlockSizeFrames, total_ready);
}
struct StackStorePackTest : public StackStoreTest,
public ::testing::WithParamInterface<
std::pair<StackStore::Compression, uptr>> {};
INSTANTIATE_TEST_SUITE_P(
PackUnpacks, StackStorePackTest,
::testing::ValuesIn({
StackStorePackTest::ParamType(StackStore::Compression::Delta,
FIRST_32_SECOND_64(2, 6)),
StackStorePackTest::ParamType(StackStore::Compression::LZW,
FIRST_32_SECOND_64(60, 130)),
}));
TEST_P(StackStorePackTest, PackUnpack) {
std::vector<StackStore::Id> ids;
StackStore::Compression type = GetParam().first;
uptr expected_ratio = GetParam().second;
ForEachTrace([&](const StackTrace& s) {
uptr pack = 0;
ids.push_back(store_.Store(s, &pack));
if (pack) {
uptr before = store_.Allocated();
uptr diff = store_.Pack(type);
uptr after = store_.Allocated();
EXPECT_EQ(before - after, diff);
EXPECT_LT(after, before);
EXPECT_GE(kBlockSizeBytes / (kBlockSizeBytes - (before - after)),
expected_ratio);
}
});
uptr packed_blocks = CountPackedBlocks();
// Unpack random block.
store_.Load(kBlockSizeFrames * 7 + 123);
EXPECT_EQ(packed_blocks - 1, CountPackedBlocks());
// Unpack all blocks.
auto id = ids.begin();
ForEachTrace([&](const StackTrace& s) {
StackTrace trace = store_.Load(*(id++));
EXPECT_EQ(s.size, trace.size);
EXPECT_EQ(s.tag, trace.tag);
EXPECT_EQ(std::vector<uptr>(s.trace, s.trace + s.size),
std::vector<uptr>(trace.trace, trace.trace + trace.size));
});
EXPECT_EQ(0u, CountPackedBlocks());
EXPECT_EQ(0u, store_.Pack(type));
EXPECT_EQ(0u, CountPackedBlocks());
}
TEST_P(StackStorePackTest, Failed) {
MurMur2Hash64Builder h(0);
StackStore::Compression type = GetParam().first;
std::vector<uptr> frames(200);
for (uptr i = 0; i < kBlockSizeFrames * 4 / frames.size(); ++i) {
for (uptr& f : frames) {
h.add(1);
// Make it difficult to pack.
f = h.get();
}
uptr pack = 0;
store_.Store(StackTrace(frames.data(), frames.size()), &pack);
if (pack)
EXPECT_EQ(0u, store_.Pack(type));
}
EXPECT_EQ(0u, CountPackedBlocks());
}
} // namespace __sanitizer
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