static_unittests.cc

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// Copyright 2023 The Chromium Authors

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#include <stddef.h>

#include <stdint.h>

#include <limits>

#include <memory>

#include "build/rust/tests/test_rust_static_library/src/lib.rs.h"

#include "partition_alloc/buildflags.h"

#include "testing/gtest/include/gtest/gtest.h"

#if PA_BUILDFLAG(USE_PARTITION_ALLOC)

#if PA_BUILDFLAG(HAS_64_BIT_POINTERS)

#include "partition_alloc/partition_address_space.h"  // nogncheck

#else

#include "partition_alloc/address_pool_manager_bitmap.h"  // nogncheck

#endif

#endif

TEST(RustStaticTest, CppCallingIntoRust_BasicFFI) {

  EXPECT_EQ(7, add_two_ints_via_rust(3, 4));

#if PA_BUILDFLAG(USE_PARTITION_ALLOC)

TEST(RustStaticTest, RustComponentUsesPartitionAlloc) {

  // Verify that PartitionAlloc is consistently used in C++ and Rust.

  auto cpp_allocated_int = std::make_unique<int>();

  SomeStruct* rust_allocated_ptr = allocate_via_rust().into_raw();

  EXPECT_EQ(partition_alloc::IsManagedByPartitionAlloc(

                reinterpret_cast<uintptr_t>(rust_allocated_ptr)),

            partition_alloc::IsManagedByPartitionAlloc(

                reinterpret_cast<uintptr_t>(cpp_allocated_int.get())));

  rust::Box<SomeStruct>::from_raw(rust_allocated_ptr);

#endif  // PA_BUILDFLAG(USE_PARTITION_ALLOC)

TEST(RustStaticTest, AllocAligned) {

  alloc_aligned();

TEST(RustStaticTest, RustLargeAllocationFailure) {

  // A small allocation that should always succeed. If allocation succeeds, we

  // get true back.

  EXPECT_TRUE(allocate_huge_via_rust(100u, 1u));

#if PA_BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC)

  // We only do these tests when using PA, as the system allocator will not fail

  // on large allocations (unless it is really OOM).

  // PartitionAlloc currently limits all allocations to no more than i32::MAX

  // elements, so the allocation will fail. If done through normal malloc(),

  // PA will crash when an allocation fails rather than return null, but Rust

  // can be trusted to handle failure without introducing null derefs so this

  // should fail gracefully.

  size_t max_size = partition_alloc::internal::MaxDirectMapped();

  EXPECT_FALSE(allocate_huge_via_rust(max_size + 1u, 4u));

  // Same as above but with an alignment larger than PartitionAlloc's default

  // alignment, which goes down a different path.

  size_t big_alignment = alignof(std::max_align_t) * 2u;

  EXPECT_FALSE(allocate_huge_via_rust(max_size + 1u, big_alignment));

  // PartitionAlloc will crash if given an alignment larger than this. The

  // allocation hooks handle it gracefully.

  size_t max_alignment = partition_alloc::internal::kMaxSupportedAlignment;

  EXPECT_FALSE(allocate_huge_via_rust(100u, max_alignment * 2u));

  // Repeat the test but with alloc_zeroed().

  EXPECT_TRUE(allocate_zeroed_huge_via_rust(100u, 1u));

  EXPECT_FALSE(allocate_zeroed_huge_via_rust(max_size + 1u, 4u));

  EXPECT_FALSE(allocate_zeroed_huge_via_rust(max_size + 1u, big_alignment));

  EXPECT_FALSE(allocate_zeroed_huge_via_rust(100u, max_alignment * 2u));

  // Repeat the test but with realloc().

  EXPECT_TRUE(reallocate_huge_via_rust(100u, 1u));

  EXPECT_FALSE(reallocate_huge_via_rust(max_size + 1u, 4u));

  EXPECT_FALSE(reallocate_huge_via_rust(max_size + 1u, big_alignment));

  // Note: We don't test with `max_alignment * 2` since the initial allocation

  // will always fail, the realloc can't happen anyway.

#endif