1 /**
2 * Copyright (c) 2021-2025 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 "hoisting.h"
17
18 #include "ir/base/scriptFunction.h"
19 #include "varbinder/scope.h"
20 #include "compiler/core/pandagen.h"
21
22 namespace ark::es2panda::compiler {
HoistVar(PandaGen * pg,varbinder::Variable * var,const varbinder::VarDecl * decl)23 static void HoistVar(PandaGen *pg, varbinder::Variable *var, const varbinder::VarDecl *decl)
24 {
25 auto *scope = pg->Scope();
26
27 if (scope->IsGlobalScope()) {
28 pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
29 pg->StoreGlobalVar(decl->Node(), decl->Name());
30 return;
31 }
32
33 varbinder::ConstScopeFindResult result(decl->Name(), scope, 0, var);
34
35 pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
36 pg->StoreAccToLexEnv(decl->Node(), result, true);
37 }
38
HoistFunction(PandaGen * pg,varbinder::Variable * var,const varbinder::FunctionDecl * decl)39 static void HoistFunction(PandaGen *pg, varbinder::Variable *var, const varbinder::FunctionDecl *decl)
40 {
41 const ir::ScriptFunction *scriptFunction = decl->Node()->AsScriptFunction();
42 auto *scope = pg->Scope();
43
44 const auto &internalName = scriptFunction->Scope()->InternalName();
45
46 if (scope->IsGlobalScope()) {
47 pg->DefineFunction(decl->Node(), scriptFunction, internalName);
48 pg->StoreGlobalVar(decl->Node(), var->Declaration()->Name());
49 return;
50 }
51
52 ES2PANDA_ASSERT(scope->IsFunctionScope() || scope->IsCatchScope() || scope->IsLocalScope() ||
53 scope->IsModuleScope());
54 varbinder::ConstScopeFindResult result(decl->Name(), scope, 0, var);
55
56 pg->DefineFunction(decl->Node(), scriptFunction, internalName);
57 pg->StoreAccToLexEnv(decl->Node(), result, true);
58 }
59
Hoist(PandaGen * pg)60 void Hoisting::Hoist(PandaGen *pg)
61 {
62 const auto *scope = pg->Scope();
63
64 for (const auto &[_, var] : scope->Bindings()) {
65 (void)_;
66 if (!var->HasFlag(varbinder::VariableFlags::HOIST)) {
67 continue;
68 }
69
70 const auto *decl = var->Declaration();
71
72 if (decl->IsVarDecl()) {
73 HoistVar(pg, var, decl->AsVarDecl());
74 } else {
75 ES2PANDA_ASSERT(decl->IsFunctionDecl());
76 HoistFunction(pg, var, decl->AsFunctionDecl());
77 }
78 }
79 }
80 } // namespace ark::es2panda::compiler
81