1 /**
2 * Copyright (c) 2021 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 <binder/binder.h>
19 #include <binder/scope.h>
20 #include <compiler/core/pandagen.h>
21 #include <ir/base/scriptFunction.h>
22 #include <ir/statements/variableDeclaration.h>
23 #include <parser/module/sourceTextModuleRecord.h>
24
25 namespace panda::es2panda::compiler {
26
StoreModuleVarOrLocalVar(PandaGen *pg, binder::ScopeFindResult &result, const binder::Decl *decl)27 static void StoreModuleVarOrLocalVar(PandaGen *pg, binder::ScopeFindResult &result, const binder::Decl *decl)
28 {
29 if (decl->IsImportOrExportDecl()) {
30 ASSERT(pg->Scope()->IsModuleScope());
31 auto *var = pg->Scope()->FindLocal(decl->Name());
32 CHECK_NOT_NULL(var);
33 ASSERT(var->IsModuleVariable());
34 pg->StoreModuleVariable(decl->Node(), var->AsModuleVariable());
35 } else {
36 pg->StoreAccToLexEnv(decl->Node(), result, true);
37 }
38 }
39
HoistVar(PandaGen *pg, binder::Variable *var, const binder::VarDecl *decl)40 static void HoistVar(PandaGen *pg, binder::Variable *var, const binder::VarDecl *decl)
41 {
42 if (decl->IsDeclare()) {
43 return;
44 }
45
46 auto *scope = pg->Scope();
47 if (scope->IsGlobalScope()) {
48 pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
49 pg->StoreGlobalVar(decl->Node(), decl->Name());
50 return;
51 }
52
53 auto *funcScope = scope->EnclosingFunctionVariableScope();
54 CHECK_NOT_NULL(funcScope);
55 if (scope->HasParamScope() && funcScope->ParamScope()->HasParam(decl->Name())) {
56 return;
57 }
58
59 binder::ScopeFindResult result(decl->Name(), scope, 0, var);
60
61 pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
62 StoreModuleVarOrLocalVar(pg, result, decl);
63 }
64
HoistFunction(PandaGen *pg, binder::Variable *var, const binder::FunctionDecl *decl)65 static void HoistFunction(PandaGen *pg, binder::Variable *var, const binder::FunctionDecl *decl)
66 {
67 const ir::ScriptFunction *scriptFunction = decl->Node()->AsScriptFunction();
68 if (scriptFunction->Declare()) {
69 return;
70 }
71
72 const auto &internalName = scriptFunction->Scope()->InternalName();
73 auto *scope = pg->Scope();
74 if (scope->IsGlobalScope()) {
75 pg->DefineFunction(decl->Node(), scriptFunction, internalName);
76 pg->StoreGlobalVar(decl->Node(), var->Declaration()->Name());
77 return;
78 }
79
80 ASSERT(scope->IsFunctionScope() || scope->IsCatchScope() || scope->IsLocalScope() ||
81 scope->IsModuleScope() || scope->IsTSModuleScope() || scope->IsTSEnumScope() ||
82 scope->IsStaticBlockScope());
83 binder::ScopeFindResult result(decl->Name(), scope, 0, var);
84
85 pg->DefineFunction(decl->Node(), scriptFunction, internalName);
86 StoreModuleVarOrLocalVar(pg, result, decl);
87 }
88
HoistNameSpaceImports(PandaGen *pg)89 static void HoistNameSpaceImports(PandaGen *pg)
90 {
91 if (pg->Scope()->IsModuleScope()) {
92 parser::SourceTextModuleRecord *moduleRecord = pg->Binder()->Program()->ModuleRecord();
93 ASSERT(moduleRecord != nullptr);
94 for (auto nameSpaceEntry : moduleRecord->GetNamespaceImportEntries()) {
95 auto *var = pg->TopScope()->FindLocal(nameSpaceEntry->localName_);
96 CHECK_NOT_NULL(var);
97 auto *node = var->Declaration()->Node();
98 CHECK_NOT_NULL(node);
99 pg->GetModuleNamespace(node, nameSpaceEntry->moduleRequestIdx_);
100 pg->StoreVar(node, {nameSpaceEntry->localName_, pg->TopScope(), 0, var}, true);
101 }
102 }
103 }
104
Hoist(PandaGen *pg)105 void Hoisting::Hoist(PandaGen *pg)
106 {
107 const auto *scope = pg->Scope();
108
109 for (const auto &[_, var] : scope->Bindings()) {
110 (void)_;
111 if (!var->HasFlag(binder::VariableFlags::HOIST)) {
112 continue;
113 }
114
115 const auto *decl = var->Declaration();
116
117 if (decl->IsVarDecl()) {
118 HoistVar(pg, var, decl->AsVarDecl());
119 } else {
120 ASSERT(decl->IsFunctionDecl());
121 HoistFunction(pg, var, decl->AsFunctionDecl());
122 }
123 }
124
125 HoistNameSpaceImports(pg);
126 }
127
128 } // namespace panda::es2panda::compiler
129