1 /*
2 * Copyright (c) 2021-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/free_object.h"
17
18 #include "ecmascript/mem/heap.h"
19 #include "ecmascript/mem/tagged_object-inl.h"
20 #include "ecmascript/global_env_constants-inl.h"
21
22 namespace panda::ecmascript {
FillFreeObject(BaseHeap *heap, uintptr_t address, size_t size)23 FreeObject *FreeObject::FillFreeObject(BaseHeap *heap, uintptr_t address, size_t size)
24 {
25 ASAN_UNPOISON_MEMORY_REGION(reinterpret_cast<void *>(address), size);
26 auto globalConst = heap->GetGlobalConst();
27 FreeObject *object = nullptr;
28 if (size >= FreeObject::SIZE_OFFSET && size < FreeObject::SIZE) {
29 object = reinterpret_cast<FreeObject *>(address);
30 object->SetClassWithoutBarrier(
31 JSHClass::Cast(globalConst->GetFreeObjectWithOneFieldClass().GetTaggedObject()));
32 object->SetNext(INVALID_OBJECT);
33 } else if (size >= FreeObject::SIZE) {
34 object = reinterpret_cast<FreeObject *>(address);
35 object->SetClassWithoutBarrier(
36 JSHClass::Cast(globalConst->GetFreeObjectWithTwoFieldClass().GetTaggedObject()));
37 object->SetAvailable(size);
38 object->SetNext(INVALID_OBJECT);
39 } else if (size == FreeObject::NEXT_OFFSET) {
40 object = reinterpret_cast<FreeObject *>(address);
41 object->SetClassWithoutBarrier(
42 JSHClass::Cast(globalConst->GetFreeObjectWithNoneFieldClass().GetTaggedObject()));
43 } else {
44 LOG_ECMA(DEBUG) << "Fill free object size is smaller";
45 }
46 #ifdef ARK_ASAN_ON
47 ASAN_POISON_MEMORY_REGION(reinterpret_cast<void *>(address), size);
48 #endif
49 return object;
50 }
51
Available() const52 uint32_t FreeObject::Available() const
53 {
54 auto hclass = GetClass();
55 if (hclass->IsFreeObjectWithShortField()) {
56 return hclass->GetObjectSize();
57 }
58 ASSERT(GetSize().IsInt());
59 return GetSize().GetInt();
60 }
61
IsFreeObject() const62 bool FreeObject::IsFreeObject() const
63 {
64 return GetClass()->IsFreeObject();
65 }
66
67 // Before operating any freeobject, need to mark unpoison when is_asan is true.
AsanUnPoisonFreeObject() const68 void FreeObject::AsanUnPoisonFreeObject() const
69 {
70 #ifdef ARK_ASAN_ON
71 ASAN_UNPOISON_MEMORY_REGION(this, NEXT_OFFSET);
72 if (GetClass()->IsFreeObjectWithOneField()) {
73 ASAN_UNPOISON_MEMORY_REGION(this, SIZE_OFFSET);
74 } else if (GetClass()->IsFreeObjectWithTwoField()) {
75 ASAN_UNPOISON_MEMORY_REGION(this, SIZE);
76 }
77 #endif
78 }
79
80 // After operating any freeobject, need to marked poison again when is_asan is true
AsanPoisonFreeObject() const81 void FreeObject::AsanPoisonFreeObject() const
82 {
83 #ifdef ARK_ASAN_ON
84 if (GetClass()->IsFreeObjectWithNoneField()) {
85 ASAN_POISON_MEMORY_REGION(this, NEXT_OFFSET);
86 } else if (GetClass()->IsFreeObjectWithOneField()) {
87 ASAN_POISON_MEMORY_REGION(this, SIZE_OFFSET);
88 } else if (GetClass()->IsFreeObjectWithTwoField()) {
89 ASAN_POISON_MEMORY_REGION(this, SIZE);
90 }
91 #endif
92 }
93
94 } // namespace panda::ecmascript
95