1/*
2 * Copyright (c) 2021 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/interpreter/interpreter-inl.h"
17
18namespace panda::ecmascript {
19// make EcmaRuntimeCallInfo in stack pointer as fallows:
20//   +----------------------+   —
21//   |        args...       |   ^
22//   |----------------------|   |
23//   |        numArgs       |   |
24//   |----------------------|   |
25//   |        this          |   |
26//   |----------------------| EcmaRuntimeCallInfo
27//   |       newTarget      |   |
28//   |----------------------|   |
29//   |        func          |   v
30//   +----------------------+   —
31//   |      base.type       |   ^
32//   |----------------------|   |
33//   |      base.prev       | InterpretedEntryFrame
34//   |----------------------|   |
35//   |          pc          |   v
36//   +--------------------------+
37EcmaRuntimeCallInfo* EcmaInterpreter::NewRuntimeCallInfoBase(
38    JSThread *thread, JSTaggedType func, JSTaggedType thisObj, JSTaggedType newTarget,
39    uint32_t numArgs, StackCheck needCheckStack)
40{
41    JSTaggedType *prevSp = const_cast<JSTaggedType *>(thread->GetCurrentSPFrame());
42    JSTaggedType *newSp = GetInterpreterFrameEnd(thread, prevSp);
43    if (needCheckStack == StackCheck::YES &&
44        UNLIKELY(thread->DoStackOverflowCheck(newSp - numArgs - NUM_MANDATORY_JSFUNC_ARGS))) {
45        return nullptr;
46    }
47
48    for (uint32_t i = 0; i < numArgs; i++) {
49        *(--newSp) = JSTaggedValue::VALUE_UNDEFINED;
50    }
51    *(--newSp) = thisObj;
52    *(--newSp) = newTarget;
53    *(--newSp) = func;
54    *(--newSp) = numArgs + NUM_MANDATORY_JSFUNC_ARGS;
55    *(--newSp) = ToUintPtr(thread);
56    EcmaRuntimeCallInfo *ecmaRuntimeCallInfo = reinterpret_cast<EcmaRuntimeCallInfo *>(newSp);
57
58    // create entry frame.
59    InterpretedEntryFrame *entryState = InterpretedEntryFrame::GetFrameFromSp(newSp);
60    entryState->base.type = FrameType::INTERPRETER_ENTRY_FRAME;
61    entryState->base.prev = prevSp;
62    entryState->pc = nullptr;
63
64    thread->SetCurrentSPFrame(newSp);
65    return ecmaRuntimeCallInfo;
66}
67
68EcmaRuntimeCallInfo* EcmaInterpreter::NewRuntimeCallInfo(
69    JSThread *thread, JSTaggedValue func, JSTaggedValue thisObj, JSTaggedValue newTarget,
70    uint32_t numArgs, StackCheck needCheckStack)
71{
72    return NewRuntimeCallInfoBase(thread, func.GetRawData(), thisObj.GetRawData(), newTarget.GetRawData(),
73        numArgs, needCheckStack);
74}
75
76EcmaRuntimeCallInfo* EcmaInterpreter::NewRuntimeCallInfo(
77    JSThread *thread, JSHandle<JSTaggedValue> func, JSHandle<JSTaggedValue> thisObj,
78    JSHandle<JSTaggedValue> newTarget, uint32_t numArgs, StackCheck needCheckStack)
79{
80    return NewRuntimeCallInfoBase(thread, func.GetTaggedType(), thisObj.GetTaggedType(), newTarget.GetTaggedType(),
81        numArgs, needCheckStack);
82}
83
84EcmaRuntimeCallInfo* EcmaInterpreter::ReBuildRuntimeCallInfo(JSThread *thread, EcmaRuntimeCallInfo* info,
85    int numArgs, StackCheck needCheckStack)
86{
87    JSTaggedValue func = info->GetFunctionValue();
88    JSTaggedValue newTarget = info->GetNewTargetValue();
89    JSTaggedValue thisObj = info->GetThisValue();
90    JSTaggedType *currentSp = reinterpret_cast<JSTaggedType *>(info);
91
92    InterpretedEntryFrame *currentEntryState = InterpretedEntryFrame::GetFrameFromSp(currentSp);
93    JSTaggedType *prevSp = currentEntryState->base.prev;
94
95    int actualArgc = static_cast<int>(info->GetArgsNumber());
96    std::vector<JSTaggedType> args(actualArgc);
97    for (int i = 0; i < actualArgc; i++) {
98        args[i] = info->GetCallArgValue(actualArgc - i - 1).GetRawData();
99    }
100    currentSp += (info->GetArgsNumber() + NUM_MANDATORY_JSFUNC_ARGS + 2); // 2: include thread_ and numArgs_
101    if (needCheckStack == StackCheck::YES &&
102        UNLIKELY(thread->DoStackOverflowCheck(currentSp - numArgs - NUM_MANDATORY_JSFUNC_ARGS))) {
103        return nullptr;
104    }
105    ASSERT(numArgs != actualArgc);
106    for (int i = 0; i < (numArgs - actualArgc); i++) {
107        *(--currentSp) = JSTaggedValue::VALUE_UNDEFINED;
108    }
109    for (int i = 0; i < actualArgc; i++) {
110        *(--currentSp) = args[i];
111    }
112    *(--currentSp) = thisObj.GetRawData();
113    *(--currentSp) = newTarget.GetRawData();
114    *(--currentSp) = func.GetRawData();
115    *(--currentSp) = numArgs + static_cast<int>(NUM_MANDATORY_JSFUNC_ARGS);
116    *(--currentSp) = ToUintPtr(thread);
117    EcmaRuntimeCallInfo *ecmaRuntimeCallInfo = reinterpret_cast<EcmaRuntimeCallInfo *>(currentSp);
118
119    InterpretedEntryFrame *entryState = InterpretedEntryFrame::GetFrameFromSp(currentSp);
120    entryState->base.type = FrameType::INTERPRETER_ENTRY_FRAME;
121    entryState->base.prev = prevSp;
122    entryState->pc = nullptr;
123
124    thread->SetCurrentSPFrame(currentSp);
125    return ecmaRuntimeCallInfo;
126}
127}  // namespace panda::ecmascript
128