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/*
* Copyright (C) 2014 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.
*/
#include <type_traits>
#include "base/enums.h"
#include "class_linker-inl.h"
#include "common_runtime_test.h"
#include "gtest/gtest.h"
#include "handle.h"
#include "handle_scope-inl.h"
#include "mirror/class-alloc-inl.h"
#include "mirror/class-inl.h"
#include "mirror/object.h"
#include "scoped_thread_state_change-inl.h"
#include "thread.h"
namespace art {
// Handles are value objects and should be trivially copyable.
static_assert(std::is_trivially_copyable<Handle<mirror::Object>>::value,
"Handle should be trivially copyable");
static_assert(std::is_trivially_copyable<MutableHandle<mirror::Object>>::value,
"MutableHandle should be trivially copyable");
static_assert(std::is_trivially_copyable<ScopedNullHandle<mirror::Object>>::value,
"ScopedNullHandle should be trivially copyable");
class HandleScopeTest : public CommonRuntimeTest {};
// Test the offsets computed for members of HandleScope. Because of cross-compiling
// it is impossible the use OFFSETOF_MEMBER, so we do some reasonable computations ourselves. This
// test checks whether we do the right thing.
TEST_F(HandleScopeTest, Offsets) {
ScopedObjectAccess soa(Thread::Current());
ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
// As the members of HandleScope are private, we cannot use OFFSETOF_MEMBER
// here. So do the inverse: set some data, and access it through pointers created from the offsets.
StackHandleScope<0x1> hs0(soa.Self());
static const size_t kNumReferences = 0x9ABC;
StackHandleScope<kNumReferences> test_table(soa.Self());
ObjPtr<mirror::Class> c = class_linker->FindSystemClass(soa.Self(), "Ljava/lang/Object;");
test_table.SetReference(0, c.Ptr());
uint8_t* table_base_ptr = reinterpret_cast<uint8_t*>(&test_table);
{
BaseHandleScope** link_ptr = reinterpret_cast<BaseHandleScope**>(table_base_ptr +
HandleScope::LinkOffset(kRuntimePointerSize));
EXPECT_EQ(*link_ptr, &hs0);
}
{
uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
HandleScope::NumberOfReferencesOffset(kRuntimePointerSize));
EXPECT_EQ(*num_ptr, static_cast<size_t>(kNumReferences));
}
{
auto* ref_ptr = reinterpret_cast<StackReference<mirror::Object>*>(table_base_ptr +
HandleScope::ReferencesOffset(kRuntimePointerSize));
EXPECT_OBJ_PTR_EQ(ref_ptr->AsMirrorPtr(), c);
}
}
class CollectVisitor {
public:
void VisitRootIfNonNull(StackReference<mirror::Object>* ref) {
if (!ref->IsNull()) {
visited.insert(ref);
}
++total_visited;
}
std::set<StackReference<mirror::Object>*> visited;
size_t total_visited = 0; // including null.
};
// Test functionality of variable sized handle scopes.
TEST_F(HandleScopeTest, VariableSized) {
ScopedObjectAccess soa(Thread::Current());
VariableSizedHandleScope hs(soa.Self());
ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
Handle<mirror::Class> c =
hs.NewHandle(class_linker->FindSystemClass(soa.Self(), "Ljava/lang/Object;"));
// Test nested scopes.
StackHandleScope<1> inner(soa.Self());
inner.NewHandle(c->AllocObject(soa.Self()));
// Add a bunch of handles and make sure callbacks work.
static const size_t kNumHandles = 100;
std::vector<Handle<mirror::Object>> handles;
for (size_t i = 0; i < kNumHandles; ++i) {
BaseHandleScope* base = &hs;
ObjPtr<mirror::Object> o = c->AllocObject(soa.Self());
handles.push_back(hs.NewHandle(o));
EXPECT_OBJ_PTR_EQ(o, handles.back().Get());
EXPECT_TRUE(hs.Contains(handles.back().GetReference()));
EXPECT_TRUE(base->Contains(handles.back().GetReference()));
EXPECT_EQ(hs.NumberOfReferences(), base->NumberOfReferences());
}
CollectVisitor visitor;
BaseHandleScope* base = &hs;
base->VisitRoots(visitor);
EXPECT_LE(visitor.visited.size(), base->NumberOfReferences());
EXPECT_EQ(visitor.total_visited, base->NumberOfReferences());
for (StackReference<mirror::Object>* ref : visitor.visited) {
EXPECT_TRUE(base->Contains(ref));
}
}
} // namespace art
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