1/*
2 * Copyright (c) 2021-2022 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 "envScope.h"
17
18#include <compiler/core/pandagen.h>
19#include <ir/base/classDefinition.h>
20#include <ir/statement.h>
21
22namespace panda::es2panda::compiler {
23
24ScopeContext::ScopeContext(PandaGen *pg, binder::Scope *newScope) : pg_(pg), prevScope_(pg_->scope_)
25{
26    pg_->scope_ = newScope;
27}
28
29ScopeContext::~ScopeContext()
30{
31    pg_->scope_ = prevScope_;
32}
33
34void EnvScope::Initialize(PandaGen *pg)
35{
36    pg_ = pg;
37    prev_ = pg_->envScope_;
38    pg_->envScope_ = this;
39}
40
41EnvScope::~EnvScope()
42{
43    if (!pg_) {
44        return;
45    }
46
47    pg_->envScope_ = prev_;
48}
49
50bool VariableEnvScope::InitVariableContext(PandaGen *pg, binder::VariableScope *scope)
51{
52    if (!scope->NeedLexEnv()) {
53        return false;
54    }
55
56    Initialize(pg);
57    pg_->NewLexicalEnv(scope->Node(), scope->LexicalSlots(), scope);
58    return true;
59}
60
61void LoopEnvScope::CopyPerIterationCtx()
62{
63    if (!HasEnv()) {
64        return;
65    }
66
67    auto num = scope_->LexicalSlots();
68    RegScope rs(pg_);
69    std::vector<VReg> lexicals;
70    lexicals.reserve(num);
71    for (uint32_t i = 0; i < num; i++) {
72        VReg lexical = pg_->AllocReg();
73        pg_->LoadLexicalVar(scope_->Node(), 0, i);
74        pg_->StoreAccumulator(scope_->Node(), lexical);
75        lexicals.push_back(lexical);
76    }
77    pg_->PopLexEnv(scope_->Node());
78    pg_->NewLexicalEnv(scope_->Node(), num, scope_);
79
80    for (uint32_t i = 0; i < num; i++) {
81        pg_->StoreLexicalVar(scope_->Node(), 0, i, lexicals[i]);
82    }
83}
84
85}  // namespace panda::es2panda::compiler
86