1 /*
2  * Copyright (c) 2023-2024 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 #ifndef ECMASCRIPT_DEBUGGER_DROPFRAME_MANAGER_H
17 #define ECMASCRIPT_DEBUGGER_DROPFRAME_MANAGER_H
18 
19 #include "ecmascript/js_handle.h"
20 #include "ecmascript/js_thread.h"
21 #include "ecmascript/method.h"
22 #include "libpandafile/bytecode_instruction.h"
23 
24 namespace panda::ecmascript::tooling {
25 enum class MethodType : uint8_t {
26     OTHER_METHOD = 0,
27     NORMAL_METHOD,
28     SENDABLE_METHOD
29 };
30 
31 class DropframeManager {
32 public:
33     DropframeManager() = default;
34     ~DropframeManager() = default;
35     NO_COPY_SEMANTIC(DropframeManager);
36     NO_MOVE_SEMANTIC(DropframeManager);
37 
38     void MethodEntry(JSThread *thread, JSHandle<Method> method, JSHandle<JSTaggedValue> env);
39     void MethodExit(JSThread *thread, JSHandle<Method> method);
40     void DropLastFrame(JSThread *thread);
41     uint32_t GetPromiseQueueSizeRecordOfTopFrame();
42     bool CheckIsSendableMethod();
43 private:
44     bool IsNewlexenvOpcode(BytecodeInstruction::Opcode op);
45     bool IsStlexvarOpcode(BytecodeInstruction::Opcode op);
46     std::pair<uint16_t, uint16_t> ReadStlexvarParams(const uint8_t *pc, BytecodeInstruction::Opcode op);
47 
48     void NewLexModifyRecordLevel();
49     void EmplaceLexModifyRecord(JSThread *thread, JSTaggedValue env, uint16_t slot, JSTaggedValue value);
50     uint32_t GetLexModifyRecordLevel();
51     std::vector<std::tuple<JSHandle<JSTaggedValue>, uint16_t, JSHandle<JSTaggedValue>>> GetLexModifyRecordOfTopFrame();
52     void RemoveLexModifyRecordOfTopFrame(JSThread *thread);
53     void MergeLexModifyRecordOfTopFrame(JSThread *thread);
54 
55     void PushPromiseQueueSizeRecord(JSThread *thread);
56     void PopPromiseQueueSizeRecord();
57 
58     void PushMethodInfo(std::tuple<JSPandaFile*, panda_file::File::EntityId> methodInfo);
59     bool CheckExitMethodInfo(std::tuple<JSPandaFile*, panda_file::File::EntityId> methodInfo);
60     void PopMethodInfo();
61 
62     void PushMethodType(MethodType  methodType);
63     void PopMethodType();
64 
65     void AddLexPropertiesToRecord(JSThread *thread, BytecodeInstruction &bcIns, uint16_t &newEnvCount,
66         std::set<std::pair<uint16_t, uint16_t>> &modifiedLexVarPos, JSHandle<JSTaggedValue> envHandle);
67 
68     std::stack<std::vector<std::tuple<JSHandle<JSTaggedValue>, uint16_t, JSHandle<JSTaggedValue>>>> modifiedLexVar_;
69     std::stack<uint32_t> promiseQueueSizeRecord_;
70     std::stack<MethodType> methodType_;
71     std::stack<std::tuple<JSPandaFile*, panda_file::File::EntityId>> methodInfo_;
72 
73     friend class DropframeManagerFriendTest;
74 };
75 }
76 
77 #endif  // ECMASCRIPT_DEBUGGER_DROPFRAME_MANAGER_H