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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 "gtest/gtest.h"
#include "handle_scope-inl.h"
#include "scoped_thread_state_change.h"
#include "thread.h"
namespace art {
// Handle scope with a fixed size which is allocated on the stack.
template<size_t kNumReferences>
class NoThreadStackHandleScope : public HandleScope {
public:
explicit NoThreadStackHandleScope(HandleScope* link) : HandleScope(link, kNumReferences) {
}
~NoThreadStackHandleScope() {
}
private:
// references_storage_ needs to be first so that it matches the address of references_
StackReference<mirror::Object> references_storage_[kNumReferences];
};
// 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(HandleScopeTest, Offsets) NO_THREAD_SAFETY_ANALYSIS {
// 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.
NoThreadStackHandleScope<0x9ABC> test_table(reinterpret_cast<HandleScope*>(0x5678));
test_table.SetReference(0, reinterpret_cast<mirror::Object*>(0x1234));
uint8_t* table_base_ptr = reinterpret_cast<uint8_t*>(&test_table);
{
uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
HandleScope::LinkOffset(sizeof(void*)));
EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
}
{
uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
HandleScope::NumberOfReferencesOffset(sizeof(void*)));
EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
}
{
// Assume sizeof(StackReference<mirror::Object>) == sizeof(uint32_t)
// TODO: How can we make this assumption-less but still access directly and fully?
EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
HandleScope::ReferencesOffset(sizeof(void*)));
EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
}
}
} // namespace art
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