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 "callExpression.h"
17 
18 #include <util/helpers.h>
19 #include <compiler/core/pandagen.h>
20 #include <compiler/core/regScope.h>
21 #include <typescript/checker.h>
22 #include <typescript/types/objectType.h>
23 #include <typescript/types/signature.h>
24 #include <typescript/types/type.h>
25 #include <ir/astDump.h>
26 #include <ir/base/classDefinition.h>
27 #include <ir/base/scriptFunction.h>
28 #include <ir/base/spreadElement.h>
29 #include <ir/expressions/chainExpression.h>
30 #include <ir/expressions/memberExpression.h>
31 #include <ir/ts/tsAsExpression.h>
32 #include <ir/ts/tsNonNullExpression.h>
33 #include <ir/ts/tsTypeAssertion.h>
34 #include <ir/ts/tsTypeParameterInstantiation.h>
35 
36 namespace panda::es2panda::ir {
37 
Iterate(const NodeTraverser &cb) const38 void CallExpression::Iterate(const NodeTraverser &cb) const
39 {
40     cb(callee_);
41 
42     if (typeParams_) {
43         cb(typeParams_);
44     }
45 
46     for (auto *it : arguments_) {
47         cb(it);
48     }
49 }
50 
Dump(ir::AstDumper *dumper) const51 void CallExpression::Dump(ir::AstDumper *dumper) const
52 {
53     dumper->Add({{"type", "CallExpression"},
54                  {"callee", callee_},
55                  {"arguments", arguments_},
56                  {"optional", optional_},
57                  {"typeParameters", AstDumper::Optional(typeParams_)}});
58 }
59 
CreateSpreadArguments(compiler::PandaGen *pg) const60 compiler::VReg CallExpression::CreateSpreadArguments(compiler::PandaGen *pg) const
61 {
62     compiler::VReg argsObj = pg->AllocReg();
63     pg->CreateArray(this, arguments_, argsObj);
64 
65     return argsObj;
66 }
67 
CompileSuperCallWithSpreadArgs(compiler::PandaGen *pg) const68 void CallExpression::CompileSuperCallWithSpreadArgs(compiler::PandaGen *pg) const
69 {
70     compiler::RegScope paramScope(pg);
71     const ir::ScriptFunction *constructorFunc = util::Helpers::GetContainingConstructor(this);
72     CHECK_NOT_NULL(constructorFunc);
73     // For super call in default constructor.
74     if (constructorFunc->HasFlag(ir::ScriptFunctionFlags::GENERATED_CONSTRUCTOR)) {
75         // Use callruntime.supercallforwardallargs to optimize super call in default constructor since api13.
76         if (pg->Binder()->Program()->TargetApiVersion() >= util::Helpers::SUPER_CALL_OPT_MIN_SUPPORTED_API_VERSION) {
77             compiler::VReg funcObj = pg->AllocReg();
78             pg->GetFunctionObject(this);
79             pg->StoreAccumulator(this, funcObj);
80             pg->SuperCallForwardAllArgs(this, funcObj);
81         } else {
82             compiler::VReg argsObj = pg->AllocReg();
83             arguments_[0]->AsSpreadElement()->Argument()->Compile(pg);
84             pg->StoreAccumulator(this, argsObj);
85             pg->GetFunctionObject(this);
86             pg->SuperCallSpread(this, argsObj);
87         }
88     } else {
89         compiler::VReg argsObj = CreateSpreadArguments(pg);
90         pg->GetFunctionObject(this);
91         pg->SuperCallSpread(this, argsObj);
92     }
93 }
94 
CompileSuperCall(compiler::PandaGen *pg, bool containsSpread) const95 void CallExpression::CompileSuperCall(compiler::PandaGen *pg, bool containsSpread) const
96 {
97     if (containsSpread) {
98         CompileSuperCallWithSpreadArgs(pg);
99     } else {
100         compiler::RegScope paramScope(pg);
101         compiler::VReg argStart {};
102 
103         if (arguments_.empty()) {
104             argStart = pg->AllocReg();
105             pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
106             pg->StoreAccumulator(this, argStart);
107         } else {
108             argStart = pg->NextReg();
109         }
110 
111         for (const auto *it : arguments_) {
112             compiler::VReg arg = pg->AllocReg();
113             it->Compile(pg);
114             pg->StoreAccumulator(it, arg);
115         }
116 
117         pg->SuperCall(this, argStart, arguments_.size());
118     }
119 
120     compiler::VReg newThis = pg->AllocReg();
121     pg->StoreAccumulator(this, newThis);
122 
123     pg->GetThis(this);
124     pg->ThrowIfSuperNotCorrectCall(this, 1);
125 
126     pg->LoadAccumulator(this, newThis);
127     pg->SetThis(this);
128 
129     const auto *classDef = util::Helpers::GetClassDefiniton(util::Helpers::GetContainingConstructor(this));
130     if (classDef->NeedInstanceInitializer()) {
131         auto thisReg = pg->AllocReg();
132         pg->MoveVreg(this, thisReg, newThis);
133 
134         auto [level, slot] = pg->Scope()->Find(classDef->InstanceInitializer()->Key());
135         pg->LoadLexicalVar(this, level, slot);
136 
137         pg->CallInit(this, thisReg);
138     }
139 }
140 
Compile(compiler::PandaGen *pg) const141 void CallExpression::Compile(compiler::PandaGen *pg) const
142 {
143     const ir::Expression *realCallee = callee_;
144     while (realCallee->IsTSNonNullExpression() || realCallee->IsTSAsExpression() || realCallee->IsTSTypeAssertion()) {
145         if (realCallee->IsTSNonNullExpression()) {
146             realCallee = realCallee->AsTSNonNullExpression()->Expr();
147         } else if (realCallee->IsTSAsExpression()) {
148             realCallee = realCallee->AsTSAsExpression()->Expr();
149         } else if (realCallee->IsTSTypeAssertion()) {
150             realCallee = realCallee->AsTSTypeAssertion()->GetExpression();
151         }
152     }
153 
154     if (realCallee->IsCallExpression() || realCallee->IsNewExpression()) {
155         if (pg->TryCompileFunctionCallOrNewExpression(realCallee)) {
156             return;
157         }
158     }
159 
160     compiler::RegScope rs(pg);
161     bool containsSpread = util::Helpers::ContainSpreadElement(arguments_);
162 
163     if (callee_->IsSuperExpression()) {
164         CompileSuperCall(pg, containsSpread);
165         return;
166     }
167 
168     compiler::VReg callee = pg->AllocReg();
169     bool hasThis = false;
170     compiler::VReg thisReg {};
171 
172     if (realCallee->IsMemberExpression()) {
173         hasThis = true;
174         thisReg = pg->AllocReg();
175 
176         compiler::RegScope mrs(pg);
177         realCallee->AsMemberExpression()->Compile(pg, thisReg);
178     } else if (realCallee->IsChainExpression()) {
179         hasThis = realCallee->AsChainExpression()->GetExpression()->IsMemberExpression();
180         if (hasThis) {
181             // Guaranteed by implementation in callThis, thisVReg is always the next register of callee.
182             thisVReg_ = callee + 1;
183         }
184         realCallee->AsChainExpression()->Compile(pg);
185     } else {
186         realCallee->Compile(pg);
187     }
188 
189     pg->StoreAccumulator(this, callee);
190     pg->GetOptionalChain()->CheckNullish(optional_, callee);
191 
192     if (containsSpread) {
193         if (!hasThis) {
194             thisReg = pg->AllocReg();
195             pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
196             pg->StoreAccumulator(this, thisReg);
197         }
198 
199         compiler::VReg argsObj = CreateSpreadArguments(pg);
200         pg->CallSpread(this, callee, thisReg, argsObj);
201         return;
202     }
203 
204     for (const auto *it : arguments_) {
205         it->Compile(pg);
206         compiler::VReg arg = pg->AllocReg();
207         pg->StoreAccumulator(it, arg);
208     }
209 
210     if (hasThis) {
211         pg->CallThis(this, callee, static_cast<int64_t>(arguments_.size() + 1));
212         return;
213     }
214 
215     pg->Call(this, callee, arguments_.size());
216 }
217 
Check(checker::Checker *checker) const218 checker::Type *CallExpression::Check(checker::Checker *checker) const
219 {
220     checker::Type *calleeType = callee_->Check(checker);
221 
222     // TODO(aszilagyi): handle optional chain
223     if (calleeType->IsObjectType()) {
224         checker::ObjectType *calleeObj = calleeType->AsObjectType();
225         return checker->resolveCallOrNewExpression(calleeObj->CallSignatures(), arguments_, Start());
226     }
227 
228     checker->ThrowTypeError("This expression is not callable.", Start());
229     return nullptr;
230 }
231 
UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)232 void CallExpression::UpdateSelf(const NodeUpdater &cb, [[maybe_unused]] binder::Binder *binder)
233 {
234     callee_ = std::get<ir::AstNode *>(cb(callee_))->AsExpression();
235 
236     if (typeParams_) {
237         typeParams_ = std::get<ir::AstNode *>(cb(typeParams_))->AsTSTypeParameterInstantiation();
238     }
239 
240     for (auto iter = arguments_.begin(); iter != arguments_.end(); iter++) {
241         *iter = std::get<ir::AstNode *>(cb(*iter))->AsExpression();
242     }
243 }
244 
245 }  // namespace panda::es2panda::ir
246