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(HandleScope * link)28 explicit NoThreadStackHandleScope(HandleScope* link) : HandleScope(link, 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<0x9ABC> test_table(reinterpret_cast<HandleScope*>(0x5678));
45 test_table.SetReference(0, reinterpret_cast<mirror::Object*>(0x1234));
46
47 uint8_t* table_base_ptr = reinterpret_cast<uint8_t*>(&test_table);
48
49 {
50 uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
51 HandleScope::LinkOffset(sizeof(void*)));
52 EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
53 }
54
55 {
56 uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
57 HandleScope::NumberOfReferencesOffset(sizeof(void*)));
58 EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
59 }
60
61 {
62 // Assume sizeof(StackReference<mirror::Object>) == sizeof(uint32_t)
63 // TODO: How can we make this assumption-less but still access directly and fully?
64 EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
65
66 uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
67 HandleScope::ReferencesOffset(sizeof(void*)));
68 EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
69 }
70 }
71
72 } // namespace art
73