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
22 namespace panda::es2panda::compiler {
23
ScopeContext(PandaGen * pg,binder::Scope * newScope)24 ScopeContext::ScopeContext(PandaGen *pg, binder::Scope *newScope) : pg_(pg), prevScope_(pg_->scope_)
25 {
26 pg_->scope_ = newScope;
27 }
28
~ScopeContext()29 ScopeContext::~ScopeContext()
30 {
31 pg_->scope_ = prevScope_;
32 }
33
Initialize(PandaGen * pg)34 void EnvScope::Initialize(PandaGen *pg)
35 {
36 pg_ = pg;
37 prev_ = pg_->envScope_;
38 pg_->envScope_ = this;
39 }
40
~EnvScope()41 EnvScope::~EnvScope()
42 {
43 if (!pg_) {
44 return;
45 }
46
47 pg_->envScope_ = prev_;
48 }
49
InitVariableContext(PandaGen * pg,binder::VariableScope * scope)50 bool 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
CopyPerIterationCtx()61 void 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