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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file is a modified copy of Chromium's /src/base/containers/stack_container_unittest.cc
#include <algorithm>
#include <cstddef>
#include <vector>
#include "dawn/common/RefCounted.h"
#include "dawn/common/StackContainer.h"
#include "gtest/gtest.h"
namespace {
class Placeholder : public RefCounted {
public:
explicit Placeholder(int* alive) : mAlive(alive) { ++*mAlive; }
private:
~Placeholder() override { --*mAlive; }
int* const mAlive;
};
} // namespace
TEST(StackContainer, Vector) {
const int stack_size = 3;
StackVector<int, stack_size> vect;
const int* stack_buffer = &vect.stack_data().stack_buffer()[0];
// The initial |stack_size| elements should appear in the stack buffer.
EXPECT_EQ(static_cast<size_t>(stack_size), vect.container().capacity());
for (int i = 0; i < stack_size; i++) {
vect.container().push_back(i);
EXPECT_EQ(stack_buffer, &vect.container()[0]);
EXPECT_TRUE(vect.stack_data().used_stack_buffer_);
}
// Adding more elements should push the array onto the heap.
for (int i = 0; i < stack_size; i++) {
vect.container().push_back(i + stack_size);
EXPECT_NE(stack_buffer, &vect.container()[0]);
EXPECT_FALSE(vect.stack_data().used_stack_buffer_);
}
// The array should still be in order.
for (int i = 0; i < stack_size * 2; i++) {
EXPECT_EQ(i, vect.container()[i]);
}
// Resize to smaller. Our STL implementation won't reallocate in this case,
// otherwise it might use our stack buffer. We reserve right after the resize
// to guarantee it isn't using the stack buffer, even though it doesn't have
// much data.
vect.container().resize(stack_size);
vect.container().reserve(stack_size * 2);
EXPECT_FALSE(vect.stack_data().used_stack_buffer_);
// Copying the small vector to another should use the same allocator and use
// the now-unused stack buffer. GENERALLY CALLERS SHOULD NOT DO THIS since
// they have to get the template types just right and it can cause errors.
std::vector<int, StackAllocator<int, stack_size>> other(vect.container());
EXPECT_EQ(stack_buffer, &other.front());
EXPECT_TRUE(vect.stack_data().used_stack_buffer_);
for (int i = 0; i < stack_size; i++) {
EXPECT_EQ(i, other[i]);
}
}
TEST(StackContainer, VectorDoubleDelete) {
// Regression testing for double-delete.
typedef StackVector<Ref<Placeholder>, 2> Vector;
Vector vect;
int alive = 0;
Ref<Placeholder> placeholder = AcquireRef(new Placeholder(&alive));
EXPECT_EQ(alive, 1);
vect->push_back(placeholder);
EXPECT_EQ(alive, 1);
Placeholder* placeholder_unref = placeholder.Get();
placeholder = nullptr;
EXPECT_EQ(alive, 1);
auto itr = std::find(vect->begin(), vect->end(), placeholder_unref);
EXPECT_EQ(itr->Get(), placeholder_unref);
vect->erase(itr);
EXPECT_EQ(alive, 0);
// Shouldn't crash at exit.
}
namespace {
template <size_t alignment>
class AlignedData {
public:
AlignedData() { memset(data_, 0, alignment); }
~AlignedData() = default;
AlignedData(const AlignedData&) = default;
AlignedData& operator=(const AlignedData&) = default;
alignas(alignment) char data_[alignment];
};
} // anonymous namespace
#define EXPECT_ALIGNED(ptr, align) EXPECT_EQ(0u, reinterpret_cast<uintptr_t>(ptr) & (align - 1))
TEST(StackContainer, BufferAlignment) {
StackVector<wchar_t, 16> text;
text->push_back(L'A');
EXPECT_ALIGNED(&text[0], alignof(wchar_t));
StackVector<double, 1> doubles;
doubles->push_back(0.0);
EXPECT_ALIGNED(&doubles[0], alignof(double));
StackVector<AlignedData<16>, 1> aligned16;
aligned16->push_back(AlignedData<16>());
EXPECT_ALIGNED(&aligned16[0], 16);
#if !DAWN_COMPILER_IS(GCC) || defined(__x86_64__) || defined(__i386__)
// It seems that non-X86 gcc doesn't respect greater than 16 byte alignment.
// See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33721 for details.
// TODO(sbc): Re-enable this if GCC starts respecting higher alignments.
StackVector<AlignedData<256>, 1> aligned256;
aligned256->push_back(AlignedData<256>());
EXPECT_ALIGNED(&aligned256[0], 256);
#endif
}
template class StackVector<int, 2>;
template class StackVector<Ref<Placeholder>, 2>;
template <typename T, size_t size>
void CheckStackVectorElements(const StackVector<T, size>& vec, std::initializer_list<T> expected) {
auto expected_it = expected.begin();
EXPECT_EQ(vec->size(), expected.size());
for (T t : vec) {
EXPECT_NE(expected.end(), expected_it);
EXPECT_EQ(*expected_it, t);
++expected_it;
}
EXPECT_EQ(expected.end(), expected_it);
}
TEST(StackContainer, Iteration) {
StackVector<int, 3> vect;
vect->push_back(7);
vect->push_back(11);
CheckStackVectorElements(vect, {7, 11});
for (int& i : vect) {
++i;
}
CheckStackVectorElements(vect, {8, 12});
vect->push_back(13);
CheckStackVectorElements(vect, {8, 12, 13});
vect->resize(5);
CheckStackVectorElements(vect, {8, 12, 13, 0, 0});
vect->resize(1);
CheckStackVectorElements(vect, {8});
}