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/statement.h>
20
21 namespace panda::es2panda::compiler {
22
ScopeContext(PandaGen * pg,binder::Scope * newScope)23 ScopeContext::ScopeContext(PandaGen *pg, binder::Scope *newScope) : pg_(pg), prevScope_(pg_->scope_)
24 {
25 pg_->scope_ = newScope;
26 }
27
~ScopeContext()28 ScopeContext::~ScopeContext()
29 {
30 pg_->scope_ = prevScope_;
31 }
32
Initialize(PandaGen * pg)33 void EnvScope::Initialize(PandaGen *pg)
34 {
35 pg_ = pg;
36 prev_ = pg_->envScope_;
37 pg_->envScope_ = this;
38 }
39
~EnvScope()40 EnvScope::~EnvScope()
41 {
42 if (!pg_) {
43 return;
44 }
45
46 pg_->envScope_ = prev_;
47 }
48
InitLoopContext(PandaGen * pg,binder::VariableScope * scope)49 void LoopEnvScope::InitLoopContext(PandaGen *pg, binder::VariableScope *scope)
50 {
51 if (!HasEnv()) {
52 return;
53 }
54
55 Initialize(pg);
56 ASSERT(scope->NeedLexEnv());
57 pg_->NewLexicalEnv(scope_->Node(), scope->LexicalSlots(), scope_);
58 }
59
CopyPerIterationCtx()60 void LoopEnvScope::CopyPerIterationCtx()
61 {
62 if (!HasEnv()) {
63 return;
64 }
65
66 auto num = scope_->LexicalSlots();
67 RegScope rs(pg_);
68 std::vector<VReg> lexicals;
69 lexicals.reserve(num);
70 for (uint32_t i = 0; i < num; i++) {
71 VReg lexical = pg_->AllocReg();
72 pg_->LoadLexicalVar(scope_->Node(), 0, i);
73 pg_->StoreAccumulator(scope_->Node(), lexical);
74 lexicals.push_back(lexical);
75 }
76 pg_->PopLexEnv(scope_->Node());
77 pg_->NewLexicalEnv(scope_->Node(), num, scope_);
78
79 for (uint32_t i = 0; i < num; i++) {
80 pg_->StoreLexicalVar(scope_->Node(), 0, i, lexicals[i]);
81 }
82 }
83
PopLexEnvBeforeTheNextIter()84 void LoopEnvScope::PopLexEnvBeforeTheNextIter()
85 {
86 if (!HasEnv()) {
87 return;
88 }
89
90 pg_->PopLexEnv(scope_->Node());
91 }
92
93 } // namespace panda::es2panda::compiler
94