handle_scope_test.cc revision 542451cc546779f5c67840e105c51205a1b0a8fd 
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 "base/enums.h"
18#include "gtest/gtest.h"
19#include "handle_scope-inl.h"
20#include "scoped_thread_state_change.h"
21#include "thread.h"
22
23namespace art {
24
25// Handle scope with a fixed size which is allocated on the stack.
26template<size_t kNumReferences>
27class NoThreadStackHandleScope : public HandleScope {
28 public:
29  explicit NoThreadStackHandleScope(HandleScope* link) : HandleScope(link, kNumReferences) {
30  }
31  ~NoThreadStackHandleScope() {
32  }
33
34 private:
35  // references_storage_ needs to be first so that it matches the address of references_
36  StackReference<mirror::Object> references_storage_[kNumReferences];
37};
38
39// Test the offsets computed for members of HandleScope. Because of cross-compiling
40// it is impossible the use OFFSETOF_MEMBER, so we do some reasonable computations ourselves. This
41// test checks whether we do the right thing.
42TEST(HandleScopeTest, Offsets) NO_THREAD_SAFETY_ANALYSIS {
43  // As the members of HandleScope are private, we cannot use OFFSETOF_MEMBER
44  // here. So do the inverse: set some data, and access it through pointers created from the offsets.
45  NoThreadStackHandleScope<0x9ABC> test_table(reinterpret_cast<HandleScope*>(0x5678));
46  test_table.SetReference(0, reinterpret_cast<mirror::Object*>(0x1234));
47
48  uint8_t* table_base_ptr = reinterpret_cast<uint8_t*>(&test_table);
49
50  {
51    uintptr_t* link_ptr = reinterpret_cast<uintptr_t*>(table_base_ptr +
52        HandleScope::LinkOffset(kRuntimePointerSize));
53    EXPECT_EQ(*link_ptr, static_cast<size_t>(0x5678));
54  }
55
56  {
57    uint32_t* num_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
58        HandleScope::NumberOfReferencesOffset(kRuntimePointerSize));
59    EXPECT_EQ(*num_ptr, static_cast<size_t>(0x9ABC));
60  }
61
62  {
63    // Assume sizeof(StackReference<mirror::Object>) == sizeof(uint32_t)
64    // TODO: How can we make this assumption-less but still access directly and fully?
65    EXPECT_EQ(sizeof(StackReference<mirror::Object>), sizeof(uint32_t));
66
67    uint32_t* ref_ptr = reinterpret_cast<uint32_t*>(table_base_ptr +
68        HandleScope::ReferencesOffset(kRuntimePointerSize));
69    EXPECT_EQ(*ref_ptr, static_cast<uint32_t>(0x1234));
70  }
71}
72
73}  // namespace art
74