ir/base/classDefinition.cpp

/**
 * Copyright (c) 2021-2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "classDefinition.h"

#include "compiler/base/literals.h"
#include "compiler/base/lreference.h"
#include "compiler/core/pandagen.h"
#include "typescript/checker.h"
#include "ir/astDump.h"
#include "ir/base/scriptFunction.h"
#include "ir/expressions/assignmentExpression.h"
#include "ir/expressions/functionExpression.h"
#include "ir/expressions/literals/numberLiteral.h"
#include "ir/expressions/literals/stringLiteral.h"
#include "ir/expressions/literals/taggedLiteral.h"
#include "ir/expressions/memberExpression.h"
#include "ir/statements/blockStatement.h"
#include "ir/statements/expressionStatement.h"
#include "ir/ts/tsClassImplements.h"
#include "ir/ts/tsIndexSignature.h"
#include "ir/ts/tsTypeParameter.h"
#include "ir/ts/tsTypeParameterDeclaration.h"
#include "ir/ts/tsTypeParameterInstantiation.h"
#include "ir/ts/tsUnionType.h"

namespace panda::es2panda::ir {

const FunctionExpression *ClassDefinition::Ctor() const
{
    ASSERT(ctor_ != nullptr);
    return ctor_->Value();
}

util::StringView ClassDefinition::GetName() const
{
    if (ident_) {
        return ident_->Name();
    }

    if (exportDefault_) {
        return parser::SourceTextModuleRecord::DEFAULT_LOCAL_NAME;
    }

    return "";
}

void ClassDefinition::Iterate(const NodeTraverser &cb) const
{
    if (ident_) {
        cb(ident_);
    }

    if (typeParams_) {
        cb(typeParams_);
    }

    if (superClass_) {
        cb(superClass_);
    }

    if (superTypeParams_) {
        cb(superTypeParams_);
    }

    for (auto *it : implements_) {
        cb(it);
    }

    cb(ctor_);

    for (auto *it : body_) {
        cb(it);
    }

    for (auto *it : indexSignatures_) {
        cb(it);
    }
}

void ClassDefinition::Dump(ir::AstDumper *dumper) const
{
    dumper->Add({{"id", AstDumper::Nullable(ident_)},
                 {"typeParameters", AstDumper::Optional(typeParams_)},
                 {"superClass", AstDumper::Nullable(superClass_)},
                 {"superTypeParameters", AstDumper::Optional(superTypeParams_)},
                 {"implements", implements_},
                 {"constructor", ctor_},
                 {"body", body_},
                 {"indexSignatures", indexSignatures_}});
}

compiler::VReg ClassDefinition::CompileHeritageClause(compiler::PandaGen *pg) const
{
    compiler::VReg baseReg = pg->AllocReg();

    if (superClass_) {
        superClass_->Compile(pg);
    } else {
        pg->LoadConst(this, compiler::Constant::JS_HOLE);
    }

    pg->StoreAccumulator(this, baseReg);
    return baseReg;
}

void ClassDefinition::InitializeClassName(compiler::PandaGen *pg) const
{
    if (!ident_) {
        return;
    }

    compiler::LReference lref = compiler::LReference::CreateLRef(pg, ident_, true);
    lref.SetValue();
}

// NOLINTNEXTLINE(google-runtime-references)
int32_t ClassDefinition::CreateClassPublicBuffer(compiler::PandaGen *pg, util::BitSet &compiled,
    int32_t fieldTypeBufIdx) const
{
    auto *buf = pg->NewLiteralBuffer();
    compiler::LiteralBuffer staticBuf(pg->Allocator());
    uint32_t instancePropertyCount = 0;
    std::unordered_map<util::StringView, size_t> propNameMap;
    std::unordered_map<util::StringView, size_t> staticPropNameMap;

    const auto &properties = body_;

    for (size_t i = 0; i < properties.size(); i++) {
        if (!properties[i]->IsMethodDefinition()) {
            continue;
        }
        const ir::MethodDefinition *prop = properties[i]->AsMethodDefinition();
        /* If it's sendable, put the getters/setters into literal buffer.
         * If not, break at getters/setters to be compatible with api10. */
        if (prop->IsPrivate()) {
            continue;
        }

        if (prop->Computed()) {
            break;
        }

        if (prop->IsAccessor() && !isSendable_) {
            break;
        }

        if (prop->IsAbstract()) {
            compiled.Set(i);
            continue;
        }

        if (prop->Value()->Function()->IsOverload()) {
            compiled.Set(i);
            continue;
        }

        util::StringView name = util::Helpers::LiteralToPropName(pg->Allocator(), prop->Key());
        compiler::LiteralBuffer *literalBuf = prop->IsStatic() ? &staticBuf : buf;
        auto &nameMap = prop->IsStatic() ? staticPropNameMap : propNameMap;

        size_t bufferPos = literalBuf->Literals().size();
        auto res = nameMap.insert({name, bufferPos});
        if (res.second || isSendable_) {
            if (!prop->IsStatic()) {
                instancePropertyCount++;
            }

            literalBuf->Add(pg->Allocator()->New<StringLiteral>(name));
            literalBuf->Add(nullptr); // save for method internalname
            literalBuf->Add(nullptr); // save for method affiliate
        } else {
            bufferPos = res.first->second;
        }

        const ir::FunctionExpression *func = prop->Value()->AsFunctionExpression();
        const util::StringView &internalName = func->Function()->Scope()->InternalName();

        LiteralTag litTag = (prop->Kind() == MethodDefinitionKind::METHOD) ?  LiteralTag::METHOD :
                            ((prop->Kind() == MethodDefinitionKind::SET) ? LiteralTag::SETTER : LiteralTag::GETTER);

        Literal *value = pg->Allocator()->New<TaggedLiteral>(litTag, internalName);
        literalBuf->ResetLiteral(bufferPos + 1, value);
        Literal *methodAffiliate = pg->Allocator()->New<TaggedLiteral>(LiteralTag::METHODAFFILIATE,
                                                                       func->Function()->FormalParamsLength());
        literalBuf->ResetLiteral(bufferPos + 2, methodAffiliate); // bufferPos + 2 is saved for method affiliate
        compiled.Set(i);
    }

    /* Static items are stored at the end of the buffer */
    buf->Insert(&staticBuf);

    /* The last literal item represents the offset of the first static property. The regular property literal count
     * is divided by 2 as key/value pairs count as one. */
    buf->Add(pg->Allocator()->New<NumberLiteral>(instancePropertyCount));

    if (IsSendable()) {
        std::string recordName = std::string(pg->Binder()->Program()->RecordName());
        std::string fieldTypeIdxStr = recordName + "_" + std::to_string(fieldTypeBufIdx);
        util::UString fieldTypeLitId(fieldTypeIdxStr, pg->Allocator());
        buf->Add(pg->Allocator()->New<TaggedLiteral>(LiteralTag::LITERALARRAY, fieldTypeLitId.View()));
    }

    if (IsImplementFromEts()) {
        buf->Add(pg->Allocator()->New<TaggedLiteral>(LiteralTag::ETS_IMPLEMENTS, etsImplementsMessage_));
    }

    return pg->AddLiteralBuffer(buf);
}

int32_t ClassDefinition::CreateClassPrivateBuffer(compiler::PandaGen *pg) const
{
    auto *buf = pg->NewLiteralBuffer();
    compiler::LiteralBuffer staticBuf(pg->Allocator());
    uint32_t instancePropertyCount = 0;

    for (const auto *prop : body_) {
        if (!prop->IsMethodDefinition()) {
            continue;
        }

        const auto *methodDef = prop->AsMethodDefinition();
        if (!methodDef->IsPrivate()) {
            continue;
        }

        compiler::LiteralBuffer *literalBuf = methodDef->IsStatic() ? &staticBuf : (instancePropertyCount++, buf);
        const ir::FunctionExpression *func = methodDef->Value()->AsFunctionExpression();
        const util::StringView &internalName = func->Function()->Scope()->InternalName();
        Literal *value = nullptr;
        Literal *methodAffiliate = pg->Allocator()->New<TaggedLiteral>(LiteralTag::METHODAFFILIATE,
                                                                       func->Function()->FormalParamsLength());
        switch (methodDef->Kind()) {
            case MethodDefinitionKind::METHOD: {
                value = pg->Allocator()->New<TaggedLiteral>(LiteralTag::METHOD, internalName);
                break;
            }
            case MethodDefinitionKind::GET: {
                value = pg->Allocator()->New<TaggedLiteral>(LiteralTag::GETTER, internalName);
                break;
            }
            case MethodDefinitionKind::SET: {
                value = pg->Allocator()->New<TaggedLiteral>(LiteralTag::SETTER, internalName);
                break;
            }
            default: {
                UNREACHABLE();
            }
        }
        literalBuf->Add(value);
        literalBuf->Add(methodAffiliate);
    }

    buf->Insert(&staticBuf);
    buf->Add(pg->Allocator()->New<NumberLiteral>(instancePropertyCount));

    return pg->AddLiteralBuffer(buf);
}

void ClassDefinition::CompileMissingProperties(compiler::PandaGen *pg, const util::BitSet &compiled,
                                               compiler::VReg classReg) const
{
    const auto &properties = body_;

    compiler::VReg protoReg = pg->AllocReg();

    pg->LoadObjByName(this, classReg, "prototype");
    pg->StoreAccumulator(this, protoReg);

    for (size_t i = 0; i < properties.size(); i++) {
        if (!properties[i]->IsMethodDefinition() || compiled.Test(i)) {
            continue;
        }

        const ir::MethodDefinition *prop = properties[i]->AsMethodDefinition();
        if (prop->IsOptional() && prop->Value()->Function()->IsOverload()) {
            continue;
        }

        if (prop->IsPrivate() || prop->IsAbstract()) {
            continue;
        }

        compiler::VReg dest = prop->IsStatic() ? classReg : protoReg;
        compiler::RegScope rs(pg);

        switch (prop->Kind()) {
            case ir::MethodDefinitionKind::METHOD: {
                compiler::Operand key = prop->Computed() ? prop->KeyReg() :
                    pg->ToPropertyKey(prop->Key(), false);

                pg->LoadAccumulator(this, dest);
                const ir::FunctionExpression *func = prop->Value()->AsFunctionExpression();
                func->Compile(pg);

                pg->StoreOwnProperty(prop->Value()->Parent(), dest, key, prop->Computed());
                break;
            }
            case ir::MethodDefinitionKind::GET:
            case ir::MethodDefinitionKind::SET: {
                CompileGetterOrSetter(pg, dest, prop);
                break;
            }
            default: {
                UNREACHABLE();
            }
        }
    }

    if (NeedInstanceInitializer()) {
        InstanceInitialize(pg, protoReg);
    }
}

void ClassDefinition::StaticInitialize(compiler::PandaGen *pg, compiler::VReg classReg) const
{
    compiler::VReg callee = pg->AllocReg();
    compiler::VReg thisReg = pg->AllocReg();

    const ir::FunctionExpression *func = staticInitializer_->Value();
    func->Compile(pg);
    pg->StoreAccumulator(this, callee);

    pg->MoveVreg(this, thisReg, classReg);
    pg->CallThis(this, callee, 1);

    pg->LoadAccumulator(this, classReg);
}

void ClassDefinition::InstanceInitialize(compiler::PandaGen *pg, compiler::VReg protoReg) const
{
    pg->StoreAccumulator(this, protoReg);
    instanceInitializer_->Value()->Compile(pg);
    pg->StoreLexicalVar(instanceInitializer_, 0, GetSlot(instanceInitializer_->Key()));
}

void ClassDefinition::CompileComputedKeys(compiler::PandaGen *pg) const
{
    for (const auto &stmt : body_) {
        if (stmt->IsClassProperty()) {
            const ir::ClassProperty *prop = stmt->AsClassProperty();

            // Do not process non-static public fields when not using define semantic.
            if (!prop->IsStatic() && !pg->Binder()->Program()->UseDefineSemantic()) {
                continue;
            }

            if (prop->IsComputed() && prop->NeedCompileKey()) {
                prop->Key()->Compile(pg);
                pg->ToComputedPropertyKey(prop->Key());
                pg->StoreLexicalVar(prop->Key(), 0, GetSlot(prop->Key()));
            }
        } else if (stmt->IsMethodDefinition()) {
            auto *methodDef = stmt->AsMethodDefinition();
            if (methodDef->Computed()) {
                compiler::VReg keyReg = pg->AllocReg();
                methodDef->SetKeyReg(keyReg);
                methodDef->Key()->Compile(pg);
                pg->ToComputedPropertyKey(methodDef->Key());
                pg->StoreAccumulator(methodDef->Key(), keyReg);
            }
        }
    }
}

void ClassDefinition::Compile(compiler::PandaGen *pg) const
{
    if (declare_) {
        return;
    }

    if (isSendable_) {
        CompileSendableClass(pg);
        return;
    }

    compiler::RegScope rs(pg);
    compiler::VReg classReg = pg->AllocReg();

    compiler::LabelTarget target(pg);
    compiler::VariableEnvScope classEnvScope(pg, scope_, target);
    compiler::VReg baseReg = CompileHeritageClause(pg);
    util::StringView ctorId = ctor_->Function()->Scope()->InternalName();
    util::BitSet compiled(body_.size());

    if (hasComputedKey_) {
        CompileComputedKeys(pg);
    }

    int32_t bufIdx = CreateClassPublicBuffer(pg, compiled);
    pg->DefineClassWithBuffer(this, ctorId, bufIdx, baseReg);

    pg->StoreAccumulator(this, classReg);

    if (HasStaticPrivateMethod()) {
        pg->StoreLexicalVar(this, 0, scope_->staticMethodValidation_);
    }

    InitializeClassName(pg);

    CompileMissingProperties(pg, compiled, classReg);

    if (hasPrivateElement_) {
        int32_t bufIdx = CreateClassPrivateBuffer(pg);
        pg->CreatePrivateProperty(this, scope_->privateFieldCnt_, bufIdx);
    }

    pg->LoadAccumulator(this, classReg);

    if (NeedStaticInitializer()) {
        StaticInitialize(pg, classReg);
    }
}

checker::Type *ClassDefinition::Check(checker::Checker *checker) const
{
    return checker->GlobalAnyType();
}

void ClassDefinition::UpdateSelf(const NodeUpdater &cb, binder::Binder *binder)
{
    auto scopeCtx = binder::LexicalScope<binder::ClassScope>::Enter(binder, scope_);

    if (ident_) {
        ident_ = std::get<ir::AstNode *>(cb(ident_))->AsIdentifier();
    }

    if (typeParams_) {
        typeParams_ = std::get<ir::AstNode *>(cb(typeParams_))->AsTSTypeParameterDeclaration();
    }

    if (superClass_) {
        superClass_ = std::get<ir::AstNode *>(cb(superClass_))->AsExpression();
    }

    if (superTypeParams_) {
        superTypeParams_ = std::get<ir::AstNode *>(cb(superTypeParams_))->AsTSTypeParameterInstantiation();
    }

    for (auto iter = implements_.begin(); iter != implements_.end(); iter++) {
        *iter = std::get<ir::AstNode *>(cb(*iter))->AsTSClassImplements();
    }

    ctor_ = std::get<ir::AstNode *>(cb(ctor_))->AsMethodDefinition();

    for (auto iter = body_.begin(); iter != body_.end(); iter++) {
        *iter = std::get<ir::AstNode *>(cb(*iter))->AsStatement();
    }

    for (auto iter = indexSignatures_.begin(); iter != indexSignatures_.end(); iter++) {
        *iter = std::get<ir::AstNode *>(cb(*iter))->AsTSIndexSignature();
    }
}


void ClassDefinition::BuildClassEnvironment(bool useDefineSemantic)
{
    int instancePrivateMethodCnt = 0;
    int staticPrivateMethodCnt = 0;
    int privateFieldCnt = 0;
    std::vector<const Statement *> privateProperties;
    for (const auto *stmt : body_) {
        if (stmt->IsMethodDefinition()) {
            auto *methodDef = stmt->AsMethodDefinition();
            if (methodDef->IsPrivate()) {
                privateProperties.push_back(stmt);
                methodDef->IsStatic() ? staticPrivateMethodCnt ++ : instancePrivateMethodCnt++;
            } else if (methodDef->Computed()) {
                hasComputedKey_ = true;
            }
            continue;
        }

        if (stmt->IsClassStaticBlock()) {
            needStaticInitializer_ = true;
            continue;
        }

        ASSERT(stmt->IsClassProperty());
        const auto *prop = stmt->AsClassProperty();
        // Do not process non-static public fields when not using define semantic.
        if (!prop->IsPrivate() && !prop->IsStatic() && !useDefineSemantic) {
            continue;
        }

        prop->IsStatic() ? needStaticInitializer_ = true : needInstanceInitializer_ = true;

        if (prop->IsComputed() && prop->NeedCompileKey()) {
            hasComputedKey_ = true;
            scope_->AddClassVariable(prop->Key());
        } else if (prop->IsPrivate()) {
            privateFieldCnt++;
            privateProperties.push_back(stmt);
        }
    }

    if (!privateProperties.empty()) {
        hasPrivateElement_ = true;
        scope_->AddPrivateName(privateProperties, privateFieldCnt, instancePrivateMethodCnt, staticPrivateMethodCnt);
    }

    if (instancePrivateMethodCnt > 0) {
        needInstanceInitializer_ = true;
    }

    if (NeedInstanceInitializer()) {
        scope_->AddClassVariable(instanceInitializer_->Key());
    }
}

void ClassDefinition::AddFieldType(FieldType &fieldType, const Expression *typeAnnotation,
    compiler::PandaGen *pg) const
{
    switch (typeAnnotation->Type()) {
        case AstNodeType::TS_NUMBER_KEYWORD: {
            fieldType |= FieldType::NUMBER;
            break;
        }
        case AstNodeType::TS_STRING_KEYWORD: {
            fieldType |= FieldType::STRING;
            break;
        }
        case AstNodeType::TS_BOOLEAN_KEYWORD: {
            fieldType |= FieldType::BOOLEAN;
            break;
        }
        case AstNodeType::TS_TYPE_REFERENCE: {
            AddFieldTypeForTypeReference(typeAnnotation->AsTSTypeReference(), fieldType, pg);
            break;
        }
        case AstNodeType::TS_BIGINT_KEYWORD: {
            fieldType |= FieldType::BIGINT;
            break;
        }
        case AstNodeType::TS_NULL_KEYWORD: {
            fieldType |= FieldType::TS_NULL;
            break;
        }
        case AstNodeType::TS_UNDEFINED_KEYWORD: {
            fieldType |= FieldType::TS_UNDEFINED;
            break;
        }
        default: {
            UNREACHABLE();
        }
    }
}

void ClassDefinition::AddFieldTypeForTypeReference(const TSTypeReference *typeReference, FieldType &fieldType,
    compiler::PandaGen *pg) const
{
    auto typeName = typeReference->TypeName();
    ASSERT(typeName != nullptr);
    if (!typeName->IsIdentifier()) {
        fieldType |= FieldType::GENERIC;
        return;
    }

    util::StringView propertyName = typeName->AsIdentifier()->Name();
    binder::ScopeFindResult result = scope_->Find(propertyName);

    // identify import type
    parser::SourceTextModuleRecord *moduleRecord = pg->Binder()->Program()->TypeModuleRecord();
    const auto &regularImportEntries = moduleRecord->GetRegularImportEntries();
    if (regularImportEntries.find(propertyName) != regularImportEntries.end()) {
        fieldType |= FieldType::GENERIC;
        return;
    }

    if (IsTypeParam(propertyName) || (result.variable != nullptr && result.variable->IsModuleVariable())) {
        fieldType |= FieldType::GENERIC;
        return;
    }

    // ts enum type
    const ir::AstNode *declNode = GetDeclNodeFromIdentifier(typeName->AsIdentifier());
    if (declNode != nullptr && declNode->IsTSEnumDeclaration()) {
        fieldType |= FieldType::STRING | FieldType::NUMBER;
        return;
    }

    // sendable class and sendable fuction
    fieldType |= FieldType::TS_TYPE_REF;
}

const ir::AstNode *ClassDefinition::GetDeclNodeFromIdentifier(const ir::Identifier *identifier) const
{
    if (identifier == nullptr) {
        return nullptr;
    }

    for (const auto &v : identifier->TSVariables()) {
        if (v == nullptr || v->Declaration() == nullptr || v->Declaration()->Node() == nullptr) {
            continue;
        }

        auto res = v->Declaration()->Node();
        return res;
    }

    // In general, the declaration node of a type node could alaways be found in ts ast.
    // The following branch, finding declaration node in js ast, is added for some unexpected corner cases.
    if (identifier->Variable() && identifier->Variable()->Declaration() &&
        identifier->Variable()->Declaration()->Node()) {
        return identifier->Variable()->Declaration()->Node()->Original();
    }

    return nullptr;
}

bool ClassDefinition::IsTypeParam(const util::StringView &propertyName) const
{
    if (typeParams_ == nullptr) {
        return false;
    }

    for (auto param : typeParams_->Params()) {
        util::StringView paramName = param->Name()->AsIdentifier()->Name();
        if (paramName == propertyName) {
            return true;
        }
    }
    return false;
}

int32_t ClassDefinition::CreateFieldTypeBuffer(compiler::PandaGen *pg) const
{
    ASSERT(IsSendable());
    auto *instanceBuf = pg->NewLiteralBuffer();
    compiler::LiteralBuffer staticBuf(pg->Allocator());
    uint32_t instanceFieldCnt {0};

    for (auto *prop : body_) {
        if (!prop->IsClassProperty()) {
            continue;
        }

        auto *classProp = prop->AsClassProperty();
        auto *buf = classProp->IsStatic() ? &staticBuf : (++instanceFieldCnt, instanceBuf);
        auto name = util::Helpers::LiteralToPropName(pg->Allocator(), classProp->Key());
        buf->Add(pg->Allocator()->New<StringLiteral>(name));

        FieldType fieldType = FieldType::NONE;
        const auto *typeAnnotation = classProp->TypeAnnotation();
        if (typeAnnotation == nullptr) {
            util::Helpers::ThrowError(ErrorType::GENERIC, pg->Binder()->Program(), prop->Start(),
                "Field in sendable class must have type annotation");
        }
        if (typeAnnotation->IsTSUnionType()) {
            for (const auto *type : typeAnnotation->AsTSUnionType()->Types()) {
                AddFieldType(fieldType, type, pg);
            }
        } else {
            AddFieldType(fieldType, typeAnnotation, pg);
        }
        buf->Add(pg->Allocator()->New<NumberLiteral>(static_cast<uint8_t>(fieldType)));
    }

    instanceBuf->Insert(&staticBuf);
    instanceBuf->Add(pg->Allocator()->New<NumberLiteral>(instanceFieldCnt));
    return pg->AddLiteralBuffer(instanceBuf);
}

void ClassDefinition::CompileSendableClass(compiler::PandaGen *pg) const
{
    compiler::RegScope rs(pg);
    compiler::VReg classReg = pg->AllocReg();

    compiler::LocalRegScope lrs(pg, scope_);

    compiler::VReg baseReg = CompileHeritageClause(pg);
    util::StringView ctorId = ctor_->Function()->Scope()->InternalName();
    util::BitSet compiled(body_.size());

    int32_t fieldTypeBufIdx = CreateFieldTypeBuffer(pg);
    int32_t bufIdx = CreateClassPublicBuffer(pg, compiled, fieldTypeBufIdx);
    pg->DefineSendableClass(this, ctorId, bufIdx, baseReg);

    pg->StoreAccumulator(this, classReg);

    InitializeClassName(pg);

    if (NeedStaticInitializer()) {
        StaticInitialize(pg, classReg);
    }
}

void ClassDefinition::CompileGetterOrSetter(compiler::PandaGen *pg, compiler::VReg dest,
    const MethodDefinition *prop) const
{
    compiler::VReg keyReg = prop->Computed() ? prop->KeyReg() : pg->LoadPropertyKey(prop->Key(), false);

    compiler::VReg undef = pg->AllocReg();
    pg->LoadConst(this, compiler::Constant::JS_UNDEFINED);
    pg->StoreAccumulator(this, undef);

    compiler::VReg getter = undef;
    compiler::VReg setter = undef;

    pg->LoadAccumulator(this, dest);

    compiler::VReg accessor = pg->AllocReg();
    prop->Value()->Compile(pg);
    pg->StoreAccumulator(prop->Value(), accessor);

    if (prop->Kind() == ir::MethodDefinitionKind::GET) {
        getter = accessor;
    } else {
        setter = accessor;
    }

    pg->DefineGetterSetterByValue(this, dest, keyReg, getter, setter, prop->Computed());
}

void ClassDefinition::CalculateClassExpectedPropertyCount()
{
    // Counting more or less than the actual number does not affect execution.
    std::unordered_set<util::StringView> propertyNames;
    auto addPropertyName = [this, &propertyNames](const util::StringView &name) {
        if (propertyNames.find(name) == propertyNames.end()) {
            propertyNames.insert(name);
            IncreasePropertyCount();
        }
    };

    for (const auto &stmt : Body()) {
        if (stmt->IsClassProperty() && !stmt->AsClassProperty()->IsStatic()) {
            ProcessClassProperty(stmt->AsClassProperty(), addPropertyName);
        }
    }

    auto *ctorFunc = ctor_->Function();
    if (ctorFunc && ctorFunc->Body()) {
        ProcessConstructorBody(ctorFunc->Body()->AsBlockStatement(), addPropertyName);
    }
}

void ClassDefinition::ProcessClassProperty(const ClassProperty *prop,
                                           const std::function<void(const util::StringView&)>& addPropertyName)
{
    /**
     * Private fields must be explicitly declared in the class and cannot be directly initialized in the constructor,
     * so they only need to be accounted for in the class properties.
     */
    if (prop->IsPrivate()) {
        IncreasePropertyCount();
    } else {
        ProcessPropertyKey(prop->Key(), addPropertyName);
    }
}

void ClassDefinition::ProcessConstructorBody(const BlockStatement *body,
                                             const std::function<void(const util::StringView&)>& addPropertyName)
{
    for (const auto &stmt : body->Statements()) {
        if (!stmt->IsExpressionStatement()) {
            continue;
        }

        auto *expr = stmt->AsExpressionStatement()->GetExpression();
        if (!expr->IsAssignmentExpression()) {
            continue;
        }

        auto *assignExpr = expr->AsAssignmentExpression();
        if (!assignExpr->Left()->IsMemberExpression()) {
            continue;
        }

        auto *memberExpr = assignExpr->Left()->AsMemberExpression();
        if (memberExpr->Object()->IsThisExpression()) {
            ProcessPropertyKey(memberExpr->Property(), addPropertyName);
        }
    }
}

void ClassDefinition::ProcessPropertyKey(const Expression* key,
                                         const std::function<void(const util::StringView&)>& addPropertyName)
{
    if (key->IsIdentifier()) {
        addPropertyName(key->AsIdentifier()->Name());
    } else if (key->IsStringLiteral()) {
        addPropertyName(key->AsStringLiteral()->Str());
    } else if (key->IsNumberLiteral()) {
        addPropertyName(key->AsNumberLiteral()->Str());
    } else {
        /**
         * Currently, other situations of property keys are not counted.
         * 1. Private properties (PrivateIdentifier)
         * 2. Template literals (TemplateLiteral)
         * 3. Binary expressions (BinaryExpression)
         * 4. Other expressions that can be evaluated to a property key
         */
    }
}
}  // namespace panda::es2panda::ir