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1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "gtest/gtest.h"
18 #include "handle_scope-inl.h"
19 #include "scoped_thread_state_change.h"
20 #include "thread.h"
21 
22 namespace art {
23 
24 // Handle scope with a fixed size which is allocated on the stack.
25 template<size_t kNumReferences>
26 class NoThreadStackHandleScope : public HandleScope {
27  public:
NoThreadStackHandleScope()28   explicit NoThreadStackHandleScope() : HandleScope(kNumReferences) {
29   }
~NoThreadStackHandleScope()30   ~NoThreadStackHandleScope() {
31   }
32 
33  private:
34   // references_storage_ needs to be first so that it matches the address of references_
35   StackReference<mirror::Object> references_storage_[kNumReferences];
36 };
37 
38 // Test the offsets computed for members of HandleScope. Because of cross-compiling
39 // it is impossible the use OFFSETOF_MEMBER, so we do some reasonable computations ourselves. This
40 // test checks whether we do the right thing.
TEST(HandleScopeTest,Offsets)41 TEST(HandleScopeTest, Offsets) NO_THREAD_SAFETY_ANALYSIS {
42   // As the members of HandleScope are private, we cannot use OFFSETOF_MEMBER
43   // here. So do the inverse: set some data, and access it through pointers created from the offsets.
44   NoThreadStackHandleScope<1> test_table;
45   test_table.SetReference(0, reinterpret_cast<mirror::Object*>(0x1234));
46   test_table.SetLink(reinterpret_cast<HandleScope*>(0x5678));
47   test_table.SetNumberOfReferences(0x9ABC);
48 
49   byte* table_base_ptr = reinterpret_cast<byte*>(&test_table);
50 
51   {
52     uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
53         HandleScope::LinkOffset(kPointerSize));
54     EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
55   }
56 
57   {
58     uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
59         HandleScope::NumberOfReferencesOffset(kPointerSize));
60     EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
61   }
62 
63   {
64     // Assume sizeof(StackReference<mirror::Object>) == sizeof(uint32_t)
65     // TODO: How can we make this assumption-less but still access directly and fully?
66     EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
67 
68     uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
69         HandleScope::ReferencesOffset(kPointerSize));
70     EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
71   }
72 }
73 
74 }  // namespace art
75