/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ART_RUNTIME_GC_SPACE_SPACE_TEST_H_
#define ART_RUNTIME_GC_SPACE_SPACE_TEST_H_

#include <stdint.h>
#include <memory>

#include "base/globals.h"
#include "common_runtime_test.h"
#include "handle_scope-inl.h"
#include "mirror/array-inl.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/object-inl.h"
#include "scoped_thread_state_change-inl.h"
#include "thread_list.h"
#include "zygote_space.h"

namespace art {
namespace gc {
namespace space {

template <class Super>
class SpaceTest : public Super {
 public:
  jobject byte_array_class_ = nullptr;

  void AddSpace(ContinuousSpace* space, bool revoke = true) {
    Heap* heap = Runtime::Current()->GetHeap();
    if (revoke) {
      heap->RevokeAllThreadLocalBuffers();
    }
    {
      ScopedThreadStateChange sts(Thread::Current(), kSuspended);
      ScopedSuspendAll ssa("Add image space");
      heap->AddSpace(space);
    }
    heap->SetSpaceAsDefault(space);
  }

  mirror::Class* GetByteArrayClass(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_) {
    if (byte_array_class_ == nullptr) {
      ObjPtr<mirror::Class> byte_array_class =
          Runtime::Current()->GetClassLinker()->FindSystemClass(self, "[B");
      EXPECT_TRUE(byte_array_class != nullptr);
      byte_array_class_ = self->GetJniEnv()->NewLocalRef(byte_array_class.Ptr());
      EXPECT_TRUE(byte_array_class_ != nullptr);
    }
    return self->DecodeJObject(byte_array_class_)->AsClass();
  }

  mirror::Object* Alloc(space::MallocSpace* alloc_space,
                        Thread* self,
                        size_t bytes,
                        size_t* bytes_allocated,
                        size_t* usable_size,
                        size_t* bytes_tl_bulk_allocated)
      REQUIRES_SHARED(Locks::mutator_lock_) {
    StackHandleScope<1> hs(self);
    Handle<mirror::Class> byte_array_class(hs.NewHandle(GetByteArrayClass(self)));
    mirror::Object* obj = alloc_space->Alloc(self,
                                             bytes,
                                             bytes_allocated,
                                             usable_size,
                                             bytes_tl_bulk_allocated);
    if (obj != nullptr) {
      InstallClass(obj, byte_array_class.Get(), bytes);
    }
    return obj;
  }

  mirror::Object* AllocWithGrowth(space::MallocSpace* alloc_space,
                                  Thread* self,
                                  size_t bytes,
                                  size_t* bytes_allocated,
                                  size_t* usable_size,
                                  size_t* bytes_tl_bulk_allocated)
      REQUIRES_SHARED(Locks::mutator_lock_) {
    StackHandleScope<1> hs(self);
    Handle<mirror::Class> byte_array_class(hs.NewHandle(GetByteArrayClass(self)));
    mirror::Object* obj = alloc_space->AllocWithGrowth(self, bytes, bytes_allocated, usable_size,
                                                       bytes_tl_bulk_allocated);
    if (obj != nullptr) {
      InstallClass(obj, byte_array_class.Get(), bytes);
    }
    return obj;
  }

  void InstallClass(mirror::Object* o, mirror::Class* byte_array_class, size_t size)
      REQUIRES_SHARED(Locks::mutator_lock_) {
    // Note the minimum size, which is the size of a zero-length byte array.
    EXPECT_GE(size, SizeOfZeroLengthByteArray());
    EXPECT_TRUE(byte_array_class != nullptr);
    o->SetClass(byte_array_class);
    if (kUseBakerReadBarrier) {
      // Like the proper heap object allocation, install and verify
      // the correct read barrier state.
      o->AssertReadBarrierState();
    }
    mirror::Array* arr = o->AsArray<kVerifyNone>();
    size_t header_size = SizeOfZeroLengthByteArray();
    int32_t length = size - header_size;
    arr->SetLength(length);
    EXPECT_EQ(arr->SizeOf<kVerifyNone>(), size);
  }

  static size_t SizeOfZeroLengthByteArray() {
    return mirror::Array::DataOffset(Primitive::ComponentSize(Primitive::kPrimByte)).Uint32Value();
  }

  typedef MallocSpace* (*CreateSpaceFn)(const std::string& name,
                                        size_t initial_size,
                                        size_t growth_limit,
                                        size_t capacity);

  void SizeFootPrintGrowthLimitAndTrimBody(MallocSpace* space, intptr_t object_size,
                                           int round, size_t growth_limit);
  void SizeFootPrintGrowthLimitAndTrimDriver(size_t object_size, CreateSpaceFn create_space);
};

static inline size_t test_rand(size_t* seed) {
  *seed = *seed * 1103515245 + 12345;
  return *seed;
}

template <class Super>
void SpaceTest<Super>::SizeFootPrintGrowthLimitAndTrimBody(MallocSpace* space,
                                                           intptr_t object_size,
                                                           int round,
                                                           size_t growth_limit) {
  if (((object_size > 0 && object_size >= static_cast<intptr_t>(growth_limit))) ||
      ((object_size < 0 && -object_size >= static_cast<intptr_t>(growth_limit)))) {
    // No allocation can succeed
    return;
  }

  // The space's footprint equals amount of resources requested from system
  size_t footprint = space->GetFootprint();

  // The space must at least have its book keeping allocated
  EXPECT_GT(footprint, 0u);

  // But it shouldn't exceed the initial size
  EXPECT_LE(footprint, growth_limit);

  // space's size shouldn't exceed the initial size
  EXPECT_LE(space->Size(), growth_limit);

  // this invariant should always hold or else the space has grown to be larger than what the
  // space believes its size is (which will break invariants)
  EXPECT_GE(space->Size(), footprint);

  // Fill the space with lots of small objects up to the growth limit
  size_t max_objects = (growth_limit / (object_size > 0 ? object_size : 8)) + 1;
  std::unique_ptr<mirror::Object*[]> lots_of_objects(new mirror::Object*[max_objects]);
  size_t last_object = 0;  // last object for which allocation succeeded
  size_t amount_allocated = 0;  // amount of space allocated
  Thread* self = Thread::Current();
  ScopedObjectAccess soa(self);
  size_t rand_seed = 123456789;
  for (size_t i = 0; i < max_objects; i++) {
    size_t alloc_fails = 0;  // number of failed allocations
    size_t max_fails = 30;  // number of times we fail allocation before giving up
    for (; alloc_fails < max_fails; alloc_fails++) {
      size_t alloc_size;
      if (object_size > 0) {
        alloc_size = object_size;
      } else {
        alloc_size = test_rand(&rand_seed) % static_cast<size_t>(-object_size);
        // Note the minimum size, which is the size of a zero-length byte array.
        size_t size_of_zero_length_byte_array = SizeOfZeroLengthByteArray();
        if (alloc_size < size_of_zero_length_byte_array) {
          alloc_size = size_of_zero_length_byte_array;
        }
      }
      StackHandleScope<1> hs(soa.Self());
      auto object(hs.NewHandle<mirror::Object>(nullptr));
      size_t bytes_allocated = 0;
      size_t bytes_tl_bulk_allocated;
      if (round <= 1) {
        object.Assign(Alloc(space, self, alloc_size, &bytes_allocated, nullptr,
                            &bytes_tl_bulk_allocated));
      } else {
        object.Assign(AllocWithGrowth(space, self, alloc_size, &bytes_allocated, nullptr,
                                      &bytes_tl_bulk_allocated));
      }
      footprint = space->GetFootprint();
      EXPECT_GE(space->Size(), footprint);  // invariant
      if (object != nullptr) {  // allocation succeeded
        lots_of_objects[i] = object.Get();
        size_t allocation_size = space->AllocationSize(object.Get(), nullptr);
        EXPECT_EQ(bytes_allocated, allocation_size);
        if (object_size > 0) {
          EXPECT_GE(allocation_size, static_cast<size_t>(object_size));
        } else {
          EXPECT_GE(allocation_size, 8u);
        }
        EXPECT_TRUE(bytes_tl_bulk_allocated == 0 ||
                    bytes_tl_bulk_allocated >= allocation_size);
        amount_allocated += allocation_size;
        break;
      }
    }
    if (alloc_fails == max_fails) {
      last_object = i;
      break;
    }
  }
  CHECK_NE(last_object, 0u);  // we should have filled the space
  EXPECT_GT(amount_allocated, 0u);

  // We shouldn't have gone past the growth_limit
  EXPECT_LE(amount_allocated, growth_limit);
  EXPECT_LE(footprint, growth_limit);
  EXPECT_LE(space->Size(), growth_limit);

  // footprint and size should agree with amount allocated
  EXPECT_GE(footprint, amount_allocated);
  EXPECT_GE(space->Size(), amount_allocated);

  // Release storage in a semi-adhoc manner
  size_t free_increment = 96;
  while (true) {
    {
      ScopedThreadStateChange tsc(self, kNative);
      // Give the space a haircut.
      space->Trim();
    }

    // Bounds sanity
    footprint = space->GetFootprint();
    EXPECT_LE(amount_allocated, growth_limit);
    EXPECT_GE(footprint, amount_allocated);
    EXPECT_LE(footprint, growth_limit);
    EXPECT_GE(space->Size(), amount_allocated);
    EXPECT_LE(space->Size(), growth_limit);

    if (free_increment == 0) {
      break;
    }

    // Free some objects
    for (size_t i = 0; i < last_object; i += free_increment) {
      mirror::Object* object = lots_of_objects.get()[i];
      if (object == nullptr) {
        continue;
      }
      size_t allocation_size = space->AllocationSize(object, nullptr);
      if (object_size > 0) {
        EXPECT_GE(allocation_size, static_cast<size_t>(object_size));
      } else {
        EXPECT_GE(allocation_size, 8u);
      }
      space->Free(self, object);
      lots_of_objects.get()[i] = nullptr;
      amount_allocated -= allocation_size;
      footprint = space->GetFootprint();
      EXPECT_GE(space->Size(), footprint);  // invariant
    }

    free_increment >>= 1;
  }

  // The space has become empty here before allocating a large object
  // below. For RosAlloc, revoke thread-local runs, which are kept
  // even when empty for a performance reason, so that they won't
  // cause the following large object allocation to fail due to
  // potential fragmentation. Note they are normally revoked at each
  // GC (but no GC here.)
  space->RevokeAllThreadLocalBuffers();

  // All memory was released, try a large allocation to check freed memory is being coalesced
  StackHandleScope<1> hs(soa.Self());
  auto large_object(hs.NewHandle<mirror::Object>(nullptr));
  size_t three_quarters_space = (growth_limit / 2) + (growth_limit / 4);
  size_t bytes_allocated = 0;
  size_t bytes_tl_bulk_allocated;
  if (round <= 1) {
    large_object.Assign(Alloc(space, self, three_quarters_space, &bytes_allocated, nullptr,
                              &bytes_tl_bulk_allocated));
  } else {
    large_object.Assign(AllocWithGrowth(space, self, three_quarters_space, &bytes_allocated,
                                        nullptr, &bytes_tl_bulk_allocated));
  }
  EXPECT_TRUE(large_object != nullptr);

  // Sanity check footprint
  footprint = space->GetFootprint();
  EXPECT_LE(footprint, growth_limit);
  EXPECT_GE(space->Size(), footprint);
  EXPECT_LE(space->Size(), growth_limit);

  // Clean up
  space->Free(self, large_object.Assign(nullptr));

  // Sanity check footprint
  footprint = space->GetFootprint();
  EXPECT_LE(footprint, growth_limit);
  EXPECT_GE(space->Size(), footprint);
  EXPECT_LE(space->Size(), growth_limit);
}

template <class Super>
void SpaceTest<Super>::SizeFootPrintGrowthLimitAndTrimDriver(size_t object_size,
                                                             CreateSpaceFn create_space) {
  if (object_size < SizeOfZeroLengthByteArray()) {
    // Too small for the object layout/model.
    return;
  }
  size_t initial_size = 4 * MB;
  size_t growth_limit = 8 * MB;
  size_t capacity = 16 * MB;
  MallocSpace* space(create_space("test", initial_size, growth_limit, capacity));
  ASSERT_TRUE(space != nullptr);

  // Basic sanity
  EXPECT_EQ(space->Capacity(), growth_limit);
  EXPECT_EQ(space->NonGrowthLimitCapacity(), capacity);

  // Make space findable to the heap, will also delete space when runtime is cleaned up
  AddSpace(space);

  // In this round we don't allocate with growth and therefore can't grow past the initial size.
  // This effectively makes the growth_limit the initial_size, so assert this.
  SizeFootPrintGrowthLimitAndTrimBody(space, object_size, 1, initial_size);
  SizeFootPrintGrowthLimitAndTrimBody(space, object_size, 2, growth_limit);
  // Remove growth limit
  space->ClearGrowthLimit();
  EXPECT_EQ(space->Capacity(), capacity);
  SizeFootPrintGrowthLimitAndTrimBody(space, object_size, 3, capacity);
}

#define TEST_SizeFootPrintGrowthLimitAndTrimStatic(name, spaceName, spaceFn, size) \
  TEST_F(spaceName##StaticTest, SizeFootPrintGrowthLimitAndTrim_AllocationsOf_##name) { \
    SizeFootPrintGrowthLimitAndTrimDriver(size, spaceFn); \
  }

#define TEST_SizeFootPrintGrowthLimitAndTrimRandom(name, spaceName, spaceFn, size) \
  TEST_F(spaceName##RandomTest, SizeFootPrintGrowthLimitAndTrim_RandomAllocationsWithMax_##name) { \
    SizeFootPrintGrowthLimitAndTrimDriver(-(size), spaceFn); \
  }

#define TEST_SPACE_CREATE_FN_STATIC(spaceName, spaceFn) \
  class spaceName##StaticTest : public SpaceTest<CommonRuntimeTest> { \
  }; \
  \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(12B, spaceName, spaceFn, 12) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(16B, spaceName, spaceFn, 16) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(24B, spaceName, spaceFn, 24) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(32B, spaceName, spaceFn, 32) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(64B, spaceName, spaceFn, 64) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(128B, spaceName, spaceFn, 128) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(1KB, spaceName, spaceFn, 1 * KB) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(4KB, spaceName, spaceFn, 4 * KB) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(1MB, spaceName, spaceFn, 1 * MB) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(4MB, spaceName, spaceFn, 4 * MB) \
  TEST_SizeFootPrintGrowthLimitAndTrimStatic(8MB, spaceName, spaceFn, 8 * MB)

#define TEST_SPACE_CREATE_FN_RANDOM(spaceName, spaceFn) \
  class spaceName##RandomTest : public SpaceTest<CommonRuntimeTest> { \
  }; \
  \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(16B, spaceName, spaceFn, 16) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(24B, spaceName, spaceFn, 24) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(32B, spaceName, spaceFn, 32) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(64B, spaceName, spaceFn, 64) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(128B, spaceName, spaceFn, 128) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(1KB, spaceName, spaceFn, 1 * KB) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(4KB, spaceName, spaceFn, 4 * KB) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(1MB, spaceName, spaceFn, 1 * MB) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(4MB, spaceName, spaceFn, 4 * MB) \
  TEST_SizeFootPrintGrowthLimitAndTrimRandom(8MB, spaceName, spaceFn, 8 * MB)

}  // namespace space
}  // namespace gc
}  // namespace art

#endif  // ART_RUNTIME_GC_SPACE_SPACE_TEST_H_