1/*
2 * Copyright (c) 2021 - 2023 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/codeGen.h"
19#include "compiler/core/pandagen.h"
20#include "ir/statement.h"
21
22namespace ark::es2panda::compiler {
23ScopeContext::ScopeContext(CodeGen *cg, varbinder::Scope *newScope) : cg_(cg), prevScope_(cg_->scope_)
24{
25    cg->scope_ = newScope;
26}
27
28ScopeContext::~ScopeContext()
29{
30    cg_->scope_ = prevScope_;
31}
32
33void EnvScope::Initialize(PandaGen *pg, VReg lexEnv)
34{
35    pg_ = pg;
36    prev_ = pg_->envScope_;
37    lexEnv_ = lexEnv;
38    pg_->envScope_ = this;
39}
40
41EnvScope::~EnvScope()
42{
43    if (pg_ == nullptr) {
44        return;
45    }
46
47    pg_->envScope_ = prev_;
48}
49
50void LoopEnvScope::CopyBindings(PandaGen *pg, varbinder::VariableScope *scope, varbinder::VariableFlags flag)
51{
52    if (!HasEnv()) {
53        return;
54    }
55
56    Initialize(pg, pg->AllocReg());
57
58    pg_->NewLexEnv(scope_->Node(), scope->LexicalSlots());
59    pg_->StoreAccumulator(scope_->Node(), lexEnv_);
60
61    ASSERT(scope->NeedLexEnv());
62
63    for (const auto &[_, variable] : scope_->OrderedBindings(pg_->Allocator())) {
64        (void)_;
65        if (!variable->HasFlag(flag)) {
66            continue;
67        }
68
69        pg->LoadLexicalVar(scope_->Node(), 1, variable->AsLocalVariable()->LexIdx());
70        pg->StoreLexicalVar(scope_->Parent()->Node(), 0, variable->AsLocalVariable()->LexIdx());
71    }
72}
73
74void LoopEnvScope::CopyPetIterationCtx()
75{
76    if (!HasEnv()) {
77        return;
78    }
79
80    pg_->CopyLexEnv(scope_->Node());
81    pg_->StoreAccumulator(scope_->Node(), lexEnv_);
82}
83}  // namespace ark::es2panda::compiler
84