75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "gtest/gtest.h"
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#include "handle_scope-inl.h"
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#include "scoped_thread_state_change.h"
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#include "thread.h"
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namespace art {
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// Handle scope with a fixed size which is allocated on the stack.
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template<size_t kNumReferences>
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class NoThreadStackHandleScope : public HandleScope {
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public:
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explicit NoThreadStackHandleScope() : HandleScope(kNumReferences) {
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}
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~NoThreadStackHandleScope() {
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}
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private:
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// references_storage_ needs to be first so that it matches the address of references_
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StackReference<mirror::Object> references_storage_[kNumReferences];
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};
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// Test the offsets computed for members of HandleScope. Because of cross-compiling
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// it is impossible the use OFFSETOF_MEMBER, so we do some reasonable computations ourselves. This
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// test checks whether we do the right thing.
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TEST(HandleScopeTest, Offsets) NO_THREAD_SAFETY_ANALYSIS {
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// As the members of HandleScope are private, we cannot use OFFSETOF_MEMBER
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// here. So do the inverse: set some data, and access it through pointers created from the offsets.
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NoThreadStackHandleScope<1> test_table;
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test_table.SetReference(0, reinterpret_cast<mirror::Object*>(0x1234));
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test_table.SetLink(reinterpret_cast<HandleScope*>(0x5678));
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test_table.SetNumberOfReferences(0x9ABC);
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byte* table_base_ptr = reinterpret_cast<byte*>(&test_table);
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{
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uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
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HandleScope::LinkOffset(kPointerSize));
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EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
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}
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{
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uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
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HandleScope::NumberOfReferencesOffset(kPointerSize));
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EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
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}
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{
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// Assume sizeof(StackReference<mirror::Object>) == sizeof(uint32_t)
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// TODO: How can we make this assumption-less but still access directly and fully?
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EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
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uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
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HandleScope::ReferencesOffset(kPointerSize));
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EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
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}
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}
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} // namespace art
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