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