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CompletionLookup.cpp
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//===--- CompletionLookup.cpp ---------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/IDE/CompletionLookup.h"
#include "CodeCompletionResultBuilder.h"
#include "ExprContextAnalysis.h"
#include "swift/AST/ConformanceLookup.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/SourceFile.h"
#include "swift/Basic/Assertions.h"
using namespace swift;
using namespace swift::ide;
namespace {
static bool SwiftKeyPathFilter(ValueDecl *decl, DeclVisibilityKind) {
switch (decl->getKind()) {
case DeclKind::Var:
case DeclKind::Subscript:
return true;
default:
return false;
}
}
static bool isTopLevelSubcontext(const DeclContext *DC) {
for (; DC && DC->isLocalContext(); DC = DC->getParent()) {
switch (DC->getContextKind()) {
case DeclContextKind::TopLevelCodeDecl:
return true;
case DeclContextKind::AbstractFunctionDecl:
case DeclContextKind::SubscriptDecl:
case DeclContextKind::EnumElementDecl:
return false;
default:
continue;
}
}
return false;
}
static KnownProtocolKind
protocolForLiteralKind(CodeCompletionLiteralKind kind) {
switch (kind) {
case CodeCompletionLiteralKind::ArrayLiteral:
return KnownProtocolKind::ExpressibleByArrayLiteral;
case CodeCompletionLiteralKind::BooleanLiteral:
return KnownProtocolKind::ExpressibleByBooleanLiteral;
case CodeCompletionLiteralKind::ColorLiteral:
return KnownProtocolKind::ExpressibleByColorLiteral;
case CodeCompletionLiteralKind::ImageLiteral:
return KnownProtocolKind::ExpressibleByImageLiteral;
case CodeCompletionLiteralKind::DictionaryLiteral:
return KnownProtocolKind::ExpressibleByDictionaryLiteral;
case CodeCompletionLiteralKind::IntegerLiteral:
return KnownProtocolKind::ExpressibleByIntegerLiteral;
case CodeCompletionLiteralKind::NilLiteral:
return KnownProtocolKind::ExpressibleByNilLiteral;
case CodeCompletionLiteralKind::StringLiteral:
return KnownProtocolKind::ExpressibleByUnicodeScalarLiteral;
case CodeCompletionLiteralKind::Tuple:
llvm_unreachable("no such protocol kind");
}
llvm_unreachable("Unhandled CodeCompletionLiteralKind in switch.");
}
static Type defaultTypeLiteralKind(CodeCompletionLiteralKind kind,
ASTContext &Ctx) {
switch (kind) {
case CodeCompletionLiteralKind::BooleanLiteral:
return Ctx.getBoolType();
case CodeCompletionLiteralKind::IntegerLiteral:
return Ctx.getIntType();
case CodeCompletionLiteralKind::StringLiteral:
return Ctx.getStringType();
case CodeCompletionLiteralKind::ArrayLiteral:
if (!Ctx.getArrayDecl())
return Type();
return Ctx.getArrayDecl()->getDeclaredType();
case CodeCompletionLiteralKind::DictionaryLiteral:
if (!Ctx.getDictionaryDecl())
return Type();
return Ctx.getDictionaryDecl()->getDeclaredType();
case CodeCompletionLiteralKind::NilLiteral:
case CodeCompletionLiteralKind::ColorLiteral:
case CodeCompletionLiteralKind::ImageLiteral:
case CodeCompletionLiteralKind::Tuple:
return Type();
}
llvm_unreachable("Unhandled CodeCompletionLiteralKind in switch.");
}
/// Whether funcType has a single argument (not including defaulted arguments)
/// that is of type () -> ().
static bool hasTrivialTrailingClosure(const FuncDecl *FD,
AnyFunctionType *funcType) {
ParameterListInfo paramInfo(funcType->getParams(), FD,
/*skipCurriedSelf*/ FD->hasCurriedSelf());
if (paramInfo.size() - paramInfo.numNonDefaultedParameters() == 1) {
auto param = funcType->getParams().back();
if (!param.isAutoClosure()) {
if (auto Fn = param.getOldType()->getAs<AnyFunctionType>()) {
return Fn->getParams().empty() && Fn->getResult()->isVoid();
}
}
}
return false;
}
} // end anonymous namespace
bool swift::ide::DefaultFilter(ValueDecl *VD, DeclVisibilityKind Kind,
DynamicLookupInfo dynamicLookupInfo) {
return true;
}
bool swift::ide::KeyPathFilter(ValueDecl *decl, DeclVisibilityKind,
DynamicLookupInfo dynamicLookupInfo) {
return isa<TypeDecl>(decl) ||
(isa<VarDecl>(decl) && decl->getDeclContext()->isTypeContext());
}
bool swift::ide::MacroFilter(ValueDecl *decl, DeclVisibilityKind,
DynamicLookupInfo dynamicLookupInfo) {
return isa<MacroDecl>(decl);
}
bool swift::ide::isCodeCompletionAtTopLevel(const DeclContext *DC) {
if (DC->isModuleScopeContext())
return true;
// CC token at top-level is parsed as an expression. If the only element
// body of the TopLevelCodeDecl is a CodeCompletionExpr without a base
// expression, the user might be writing a top-level declaration.
if (const TopLevelCodeDecl *TLCD = dyn_cast<const TopLevelCodeDecl>(DC)) {
auto body = TLCD->getBody();
if (!body || body->empty())
return true;
if (body->getElements().size() > 1)
return false;
auto expr = body->getFirstElement().dyn_cast<Expr *>();
if (!expr)
return false;
if (CodeCompletionExpr *CCExpr = dyn_cast<CodeCompletionExpr>(expr)) {
if (CCExpr->getBase() == nullptr)
return true;
}
}
return false;
}
bool swift::ide::isCompletionDeclContextLocalContext(DeclContext *DC) {
if (!DC->isLocalContext())
return false;
if (isCodeCompletionAtTopLevel(DC))
return false;
return true;
}
/// Returns \c true if \p DC can handles async call.
bool swift::ide::canDeclContextHandleAsync(const DeclContext *DC) {
if (auto *func = dyn_cast<AbstractFunctionDecl>(DC))
return func->isAsyncContext();
if (auto *closure = dyn_cast<ClosureExpr>(DC)) {
// See if the closure has 'async' function type.
if (auto closureType = closure->getType())
if (auto fnType = closureType->getAs<AnyFunctionType>())
if (fnType->isAsync())
return true;
// If the closure doesn't contain any async call in the body, closure itself
// doesn't have 'async' type even if 'async' closure is expected.
// func foo(fn: () async -> Void)
// foo { <HERE> }
// In this case, the closure is wrapped with a 'FunctionConversionExpr'
// which has 'async' function type.
struct AsyncClosureChecker : public ASTWalker {
const ClosureExpr *Target;
bool Result = false;
/// Walk everything in a macro.
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::ArgumentsAndExpansion;
}
AsyncClosureChecker(const ClosureExpr *Target) : Target(Target) {}
PreWalkResult<Expr *> walkToExprPre(Expr *E) override {
if (E == Target)
return Action::SkipNode(E);
if (auto conversionExpr = dyn_cast<FunctionConversionExpr>(E)) {
if (conversionExpr->getSubExpr() == Target) {
if (conversionExpr->getType()->is<AnyFunctionType>() &&
conversionExpr->getType()->castTo<AnyFunctionType>()->isAsync())
Result = true;
return Action::SkipNode(E);
}
}
return Action::Continue(E);
}
} checker(closure);
closure->getParent()->walkContext(checker);
return checker.Result;
}
return false;
}
/// Return \c true if the completion happens at top-level of a library file.
bool swift::ide::isCodeCompletionAtTopLevelOfLibraryFile(
const DeclContext *DC) {
if (DC->getParentSourceFile()->isScriptMode())
return false;
return isCodeCompletionAtTopLevel(DC);
}
// MARK: - CompletionLookup
void CompletionLookup::foundFunction(const AbstractFunctionDecl *AFD) {
FoundFunctionCalls = true;
const DeclName Name = AFD->getName();
auto ArgNames = Name.getArgumentNames();
if (ArgNames.empty())
return;
if (ArgNames[0].empty())
FoundFunctionsWithoutFirstKeyword = true;
}
void CompletionLookup::foundFunction(const AnyFunctionType *AFT) {
FoundFunctionCalls = true;
auto Params = AFT->getParams();
if (Params.empty())
return;
if (Params.size() == 1 && !Params[0].hasLabel()) {
FoundFunctionsWithoutFirstKeyword = true;
return;
}
if (!Params[0].hasLabel())
FoundFunctionsWithoutFirstKeyword = true;
}
bool CompletionLookup::canBeUsedAsRequirementFirstType(Type selfTy,
TypeAliasDecl *TAD) {
if (TAD->isGeneric())
return false;
auto T = TAD->getDeclaredInterfaceType();
auto subMap = selfTy->getContextSubstitutionMap(TAD->getDeclContext());
return T.subst(subMap)->is<ArchetypeType>();
}
CompletionLookup::CompletionLookup(CodeCompletionResultSink &Sink,
ASTContext &Ctx,
const DeclContext *CurrDeclContext,
CodeCompletionContext *CompletionContext)
: Sink(Sink), Ctx(Ctx), CurrDeclContext(CurrDeclContext),
CurrModule(CurrDeclContext ? CurrDeclContext->getParentModule()
: nullptr),
Importer(static_cast<ClangImporter *>(
CurrDeclContext->getASTContext().getClangModuleLoader())),
CompletionContext(CompletionContext) {
// Determine if we are doing code completion inside a static method.
if (CurrDeclContext) {
CurrentMethod = CurrDeclContext->getInnermostMethodContext();
if (auto *FD = dyn_cast_or_null<FuncDecl>(CurrentMethod))
InsideStaticMethod = FD->isStatic();
CanCurrDeclContextHandleAsync = canDeclContextHandleAsync(CurrDeclContext);
}
}
void CompletionLookup::addSubModuleNames(
std::vector<std::pair<std::string, bool>> &SubModuleNameVisibilityPairs) {
for (auto &Pair : SubModuleNameVisibilityPairs) {
CodeCompletionResultBuilder Builder = makeResultBuilder(
CodeCompletionResultKind::Declaration, SemanticContextKind::None);
auto *MD = ModuleDecl::createEmpty(Ctx.getIdentifier(Pair.first), Ctx);
Builder.setAssociatedDecl(MD);
Builder.addBaseName(MD->getNameStr());
Builder.addTypeAnnotation("Module");
if (Pair.second)
Builder.setContextualNotRecommended(
ContextualNotRecommendedReason::RedundantImport);
}
}
void CompletionLookup::collectImportedModules(
llvm::StringSet<> &directImportedModules,
llvm::StringSet<> &allImportedModules) {
SmallVector<ImportedModule, 16> Imported;
SmallVector<ImportedModule, 16> FurtherImported;
CurrDeclContext->getParentSourceFile()->getImportedModules(
Imported, ModuleDecl::getImportFilterLocal());
for (ImportedModule &imp : Imported)
directImportedModules.insert(imp.importedModule->getNameStr());
while (!Imported.empty()) {
ModuleDecl *MD = Imported.back().importedModule;
Imported.pop_back();
if (!allImportedModules.insert(MD->getNameStr()).second)
continue;
FurtherImported.clear();
MD->getImportedModules(FurtherImported,
ModuleDecl::ImportFilterKind::Exported);
Imported.append(FurtherImported.begin(), FurtherImported.end());
}
}
void CompletionLookup::addModuleName(
ModuleDecl *MD, std::optional<ContextualNotRecommendedReason> R) {
// Don't add underscored cross-import overlay modules.
if (MD->getDeclaringModuleIfCrossImportOverlay())
return;
CodeCompletionResultBuilder Builder = makeResultBuilder(
CodeCompletionResultKind::Declaration, SemanticContextKind::None);
Builder.setAssociatedDecl(MD);
auto moduleName = MD->getName();
// This checks if module aliasing was used. For example, when editing
// `import ...`, and `-module-alias Foo=Bar` was passed, we want to show
// Foo as an option to import, instead of Bar (name of the binary), as
// Foo is the name that should appear in source files.
auto aliasedName = Ctx.getRealModuleName(
moduleName, ASTContext::ModuleAliasLookupOption::aliasFromRealName);
if (aliasedName != moduleName && // check if module aliasing was applied
!aliasedName.empty()) { // check an alias mapped to the binary name exists
moduleName = aliasedName; // if so, use the aliased name
}
Builder.addBaseName(moduleName.str());
Builder.addTypeAnnotation("Module");
if (R)
Builder.setContextualNotRecommended(*R);
}
void CompletionLookup::addImportModuleNames() {
SmallVector<Identifier, 0> ModuleNames;
Ctx.getVisibleTopLevelModuleNames(ModuleNames);
llvm::StringSet<> directImportedModules;
llvm::StringSet<> allImportedModules;
collectImportedModules(directImportedModules, allImportedModules);
auto mainModuleName = CurrModule->getName();
for (auto ModuleName : ModuleNames) {
if (ModuleName == mainModuleName || isHiddenModuleName(ModuleName))
continue;
auto *MD = ModuleDecl::createEmpty(ModuleName, Ctx);
std::optional<ContextualNotRecommendedReason> Reason = std::nullopt;
// Imported modules are not recommended.
if (directImportedModules.contains(MD->getNameStr())) {
Reason = ContextualNotRecommendedReason::RedundantImport;
} else if (allImportedModules.contains(MD->getNameStr())) {
Reason = ContextualNotRecommendedReason::RedundantImportIndirect;
}
addModuleName(MD, Reason);
}
}
SemanticContextKind
CompletionLookup::getSemanticContext(const Decl *D, DeclVisibilityKind Reason,
DynamicLookupInfo dynamicLookupInfo) {
if (ForcedSemanticContext)
return *ForcedSemanticContext;
switch (Reason) {
case DeclVisibilityKind::LocalDecl:
case DeclVisibilityKind::FunctionParameter:
case DeclVisibilityKind::GenericParameter:
return SemanticContextKind::Local;
case DeclVisibilityKind::MemberOfCurrentNominal:
return SemanticContextKind::CurrentNominal;
case DeclVisibilityKind::MemberOfProtocolConformedToByCurrentNominal:
case DeclVisibilityKind::MemberOfSuper:
return SemanticContextKind::Super;
case DeclVisibilityKind::MemberOfOutsideNominal:
return SemanticContextKind::OutsideNominal;
case DeclVisibilityKind::VisibleAtTopLevel:
if (CurrDeclContext && D->getModuleContext() == CurrModule) {
// Treat global variables from the same source file as local when
// completing at top-level.
if (isa<VarDecl>(D) && isTopLevelSubcontext(CurrDeclContext) &&
D->getDeclContext()->getParentSourceFile() ==
CurrDeclContext->getParentSourceFile()) {
return SemanticContextKind::Local;
} else {
return SemanticContextKind::CurrentModule;
}
} else {
return SemanticContextKind::OtherModule;
}
case DeclVisibilityKind::DynamicLookup:
switch (dynamicLookupInfo.getKind()) {
case DynamicLookupInfo::None:
llvm_unreachable("invalid DynamicLookupInfo::Kind for dynamic lookup");
case DynamicLookupInfo::AnyObject:
// AnyObject results can come from different modules, including the
// current module, but we always assign them the OtherModule semantic
// context. These declarations are uniqued by signature, so it is
// totally random (determined by the hash function) which of the
// equivalent declarations (across multiple modules) we will get.
return SemanticContextKind::OtherModule;
case DynamicLookupInfo::KeyPathDynamicMember:
// Use the visibility of the underlying declaration.
// FIXME: KeyPath<AnyObject, U> !?!?
assert(dynamicLookupInfo.getKeyPathDynamicMember().originalVisibility !=
DeclVisibilityKind::DynamicLookup);
return getSemanticContext(
D, dynamicLookupInfo.getKeyPathDynamicMember().originalVisibility,
{});
}
case DeclVisibilityKind::MemberOfProtocolDerivedByCurrentNominal:
llvm_unreachable("should not see this kind");
}
llvm_unreachable("unhandled kind");
}
bool CompletionLookup::isUnresolvedMemberIdealType(Type Ty) {
assert(Ty);
if (!IsUnresolvedMember)
return false;
Type idealTy = expectedTypeContext.getIdealType();
if (!idealTy)
return false;
/// Consider optional object type is the ideal.
/// For example:
/// enum MyEnum { case foo, bar }
/// func foo(_: MyEnum?)
/// fooo(.<HERE>)
/// Prefer '.foo' and '.bar' over '.some' and '.none'.
idealTy = idealTy->lookThroughAllOptionalTypes();
return idealTy->isEqual(Ty);
}
CodeCompletionResultBuilder
CompletionLookup::makeResultBuilder(CodeCompletionResultKind kind,
SemanticContextKind semanticContext) const {
CodeCompletionResultBuilder builder(Sink, kind, semanticContext);
builder.setTypeContext(expectedTypeContext, CurrDeclContext);
return builder;
}
void CompletionLookup::addValueBaseName(CodeCompletionResultBuilder &Builder,
DeclBaseName Name) {
auto NameStr = Name.userFacingName();
bool shouldEscapeKeywords;
if (Name.isSpecial()) {
// Special names (i.e. 'init') are always displayed as its user facing
// name.
shouldEscapeKeywords = false;
} else if (ExprType) {
// After dot. User can write any keyword after '.' except for `init` and
// `self`. E.g. 'func `init`()' must be called by 'expr.`init`()'.
shouldEscapeKeywords = NameStr == "self" || NameStr == "init";
} else {
// As primary expresson. We have to escape almost every keywords except
// for 'self' and 'Self'.
shouldEscapeKeywords = NameStr != "self" && NameStr != "Self";
}
if (!shouldEscapeKeywords) {
Builder.addBaseName(NameStr);
} else {
SmallString<16> buffer;
Builder.addBaseName(Builder.escapeKeyword(NameStr, true, buffer));
}
}
void CompletionLookup::addLeadingDot(CodeCompletionResultBuilder &Builder) {
if (NeedOptionalUnwrap) {
Builder.setNumBytesToErase(NumBytesToEraseForOptionalUnwrap);
Builder.addQuestionMark();
Builder.addLeadingDot();
return;
}
if (needDot())
Builder.addLeadingDot();
}
void CompletionLookup::addTypeAnnotation(CodeCompletionResultBuilder &Builder,
Type T, GenericSignature genericSig) {
PrintOptions PO;
PO.OpaqueReturnTypePrinting =
PrintOptions::OpaqueReturnTypePrintingMode::WithoutOpaqueKeyword;
if (auto typeContext = CurrDeclContext->getInnermostTypeContext())
PO.setBaseType(typeContext->getDeclaredTypeInContext());
Builder.addTypeAnnotation(eraseArchetypes(T, genericSig), PO);
Builder.setResultTypes(T);
}
void CompletionLookup::addTypeAnnotationForImplicitlyUnwrappedOptional(
CodeCompletionResultBuilder &Builder, Type T, GenericSignature genericSig,
bool dynamicOrOptional) {
std::string suffix;
// FIXME: This retains previous behavior, but in reality the type of dynamic
// lookups is IUO, not Optional as it is for the @optional attribute.
if (dynamicOrOptional) {
T = T->getOptionalObjectType();
suffix = "?";
}
PrintOptions PO;
PO.PrintOptionalAsImplicitlyUnwrapped = true;
PO.OpaqueReturnTypePrinting =
PrintOptions::OpaqueReturnTypePrintingMode::WithoutOpaqueKeyword;
if (auto typeContext = CurrDeclContext->getInnermostTypeContext())
PO.setBaseType(typeContext->getDeclaredTypeInContext());
Builder.addTypeAnnotation(eraseArchetypes(T, genericSig), PO, suffix);
Builder.setResultTypes(T);
Builder.setTypeContext(expectedTypeContext, CurrDeclContext);
}
/// For printing in code completion results, replace archetypes with
/// protocol compositions.
///
/// FIXME: Perhaps this should be an option in PrintOptions instead.
Type CompletionLookup::eraseArchetypes(Type type, GenericSignature genericSig) {
if (!genericSig)
return type;
if (auto *genericFuncType = type->getAs<GenericFunctionType>()) {
assert(genericFuncType->getGenericSignature()->isEqual(genericSig) &&
"if not, just use the GFT's signature instead below");
SmallVector<AnyFunctionType::Param, 8> erasedParams;
for (const auto ¶m : genericFuncType->getParams()) {
auto erasedTy = eraseArchetypes(param.getPlainType(), genericSig);
erasedParams.emplace_back(param.withType(erasedTy));
}
return GenericFunctionType::get(
genericSig, erasedParams,
eraseArchetypes(genericFuncType->getResult(), genericSig),
genericFuncType->getExtInfo());
}
return type.transformRec([&](Type t) -> std::optional<Type> {
// FIXME: Code completion should only deal with one or the other,
// and not both.
if (auto *archetypeType = t->getAs<ArchetypeType>()) {
// Don't erase opaque archetype.
if (isa<OpaqueTypeArchetypeType>(archetypeType) &&
archetypeType->isRoot())
return std::nullopt;
auto genericSig = archetypeType->getGenericEnvironment()->getGenericSignature();
auto upperBound = genericSig->getUpperBound(
archetypeType->getInterfaceType(),
/*forExistentialSelf=*/false,
/*withParameterizedProtocols=*/false);
if (!upperBound->isAny())
return upperBound;
}
if (t->isTypeParameter()) {
auto upperBound = genericSig->getUpperBound(
t,
/*forExistentialSelf=*/false,
/*withParameterizedProtocols=*/false);
if (!upperBound->isAny())
return upperBound;
}
return std::nullopt;
});
}
Type CompletionLookup::getTypeOfMember(const ValueDecl *VD,
DynamicLookupInfo dynamicLookupInfo) {
switch (dynamicLookupInfo.getKind()) {
case DynamicLookupInfo::None:
return getTypeOfMember(VD, this->ExprType);
case DynamicLookupInfo::AnyObject:
return getTypeOfMember(VD, Type());
case DynamicLookupInfo::KeyPathDynamicMember: {
auto &keyPathInfo = dynamicLookupInfo.getKeyPathDynamicMember();
// Map the result of VD to keypath member lookup results.
// Given:
// struct Wrapper<T> {
// subscript<U>(dynamicMember: KeyPath<T, U>) -> Wrapped<U> { get }
// }
// struct Circle {
// var center: Point { get }
// var radius: Length { get }
// }
//
// Consider 'Wrapper<Circle>.center'.
// 'VD' is 'Circle.center' decl.
// 'keyPathInfo.subscript' is 'Wrapper<T>.subscript' decl.
// 'keyPathInfo.baseType' is 'Wrapper<Circle>' type.
// FIXME: Handle nested keypath member lookup.
// i.e. cases where 'ExprType' != 'keyPathInfo.baseType'.
auto *SD = keyPathInfo.subscript;
const auto elementTy = SD->getElementInterfaceType();
if (!elementTy->hasTypeParameter())
return elementTy;
// Map is:
// { τ_0_0(T) => Circle
// τ_1_0(U) => U }
auto subs = keyPathInfo.baseType->getMemberSubstitutions(SD);
// FIXME: The below should use substitution map substitution.
// If the keyPath result type has type parameters, that might affect the
// subscript result type.
auto keyPathResultTy = getResultTypeOfKeypathDynamicMember(SD);
if (keyPathResultTy->hasTypeParameter()) {
auto keyPathRootTy = getRootTypeOfKeypathDynamicMember(SD).subst(
QueryTypeSubstitutionMap{subs},
LookUpConformanceInModule());
// The result type of the VD.
// i.e. 'Circle.center' => 'Point'.
auto innerResultTy = getTypeOfMember(VD, keyPathRootTy);
if (auto paramTy = keyPathResultTy->getAs<GenericTypeParamType>()) {
// Replace keyPath result type in the map with the inner result type.
// i.e. Make the map as:
// { τ_0_0(T) => Circle
// τ_1_0(U) => Point }
auto key = paramTy->getCanonicalType()->castTo<GenericTypeParamType>();
subs[key] = innerResultTy;
} else {
// FIXME: Handle the case where the KeyPath result is generic.
// e.g. 'subscript<U>(dynamicMember: KeyPath<T, Box<U>>) -> Bag<U>'
// For now, just return the inner type.
return innerResultTy;
}
}
// Substitute the element type of the subscript using modified map.
// i.e. 'Wrapped<U>' => 'Wrapped<Point>'.
return elementTy.subst(QueryTypeSubstitutionMap{subs},
LookUpConformanceInModule());
}
}
llvm_unreachable("Unhandled DynamicLookupInfo Kind in switch");
}
Type CompletionLookup::getTypeOfMember(const ValueDecl *VD, Type ExprType) {
Type T = VD->getInterfaceType();
assert(!T.isNull());
if (ExprType) {
Type ContextTy = VD->getDeclContext()->getDeclaredInterfaceType();
if (ContextTy) {
// Look through lvalue types and metatypes
Type MaybeNominalType = ExprType->getRValueType();
if (auto Metatype = MaybeNominalType->getAs<MetatypeType>())
MaybeNominalType = Metatype->getInstanceType();
if (auto SelfType = MaybeNominalType->getAs<DynamicSelfType>())
MaybeNominalType = SelfType->getSelfType();
// For optional protocol requirements and dynamic dispatch,
// strip off optionality from the base type, but only if
// we're not actually completing a member of Optional.
if (!ContextTy->getOptionalObjectType() &&
MaybeNominalType->getOptionalObjectType())
MaybeNominalType = MaybeNominalType->getOptionalObjectType();
// For dynamic lookup don't substitute in the base type.
if (MaybeNominalType->isAnyObject())
return T;
// FIXME: Sometimes ExprType is the type of the member here,
// and not the type of the base. That is inconsistent and
// should be cleaned up.
if (!MaybeNominalType->mayHaveMembers())
return T;
// We can't do anything if the base type has unbound generic parameters.
if (MaybeNominalType->hasUnboundGenericType())
return T;
// If we are doing implicit member lookup on a protocol and we have found
// a declaration in a constrained extension, use the extension's `Self`
// type for the generic substitution.
// Eg in the following, the `Self` type returned by `qux` is
// `MyGeneric<Int>`, not `MyProto` because of the `Self` type restriction.
// ```
// protocol MyProto {}
// struct MyGeneric<T>: MyProto {}
// extension MyProto where Self == MyGeneric<Int> {
// static func qux() -> Self { .init() }
// }
// func takeMyProto(_: any MyProto) {}
// func test() {
// takeMyProto(.#^COMPLETE^#)
// }
// ```
if (MaybeNominalType->isExistentialType()) {
Type SelfType;
if (auto *ED = dyn_cast<ExtensionDecl>(VD->getDeclContext())) {
if (ED->getSelfProtocolDecl() && ED->isConstrainedExtension()) {
auto Sig = ED->getGenericSignature();
SelfType = Sig->getConcreteType(ED->getSelfInterfaceType());
}
}
if (SelfType) {
MaybeNominalType = SelfType;
} else {
return T;
}
}
// For everything else, substitute in the base type.
auto Subs = MaybeNominalType->getMemberSubstitutionMap(VD);
// For a GenericFunctionType, we only want to substitute the
// param/result types, as otherwise we might end up with a bad generic
// signature if there are UnresolvedTypes present in the base type. Note
// we pass in DesugarMemberTypes so that we see the actual concrete type
// witnesses instead of type alias types.
if (auto *GFT = T->getAs<GenericFunctionType>()) {
T = GFT->substGenericArgs(Subs, SubstFlags::DesugarMemberTypes);
} else {
T = T.subst(Subs, SubstFlags::DesugarMemberTypes);
}
}
}
return T;
}
Type CompletionLookup::getAssociatedTypeType(const AssociatedTypeDecl *ATD) {
Type BaseTy = BaseType;
if (!BaseTy)
BaseTy = ExprType;
if (!BaseTy && CurrDeclContext)
BaseTy =
CurrDeclContext->getInnermostTypeContext()->getDeclaredTypeInContext();
if (BaseTy) {
BaseTy = BaseTy->getInOutObjectType()->getMetatypeInstanceType();
if (BaseTy->getAnyNominal()) {
auto Conformance = lookupConformance(BaseTy, ATD->getProtocol());
if (Conformance.isConcrete()) {
return Conformance.getConcrete()->getTypeWitness(
const_cast<AssociatedTypeDecl *>(ATD));
}
}
}
return Type();
}
void CompletionLookup::analyzeActorIsolation(
const ValueDecl *VD, Type T, bool &implicitlyAsync,
std::optional<ContextualNotRecommendedReason> &NotRecommended) {
auto isolation = getActorIsolation(const_cast<ValueDecl *>(VD));
switch (isolation.getKind()) {
case ActorIsolation::ActorInstance: {
// TODO: implicitlyThrowing here for distributed
if (IsCrossActorReference) {
implicitlyAsync = true;
// TODO: 'NotRecommended' if this is a r-value reference.
}
break;
}
case ActorIsolation::GlobalActor: {
// For "preconcurrency" global actor isolation, automatic 'async' only happens
// if the context has adopted concurrency.
if (isolation.preconcurrency() &&
!CanCurrDeclContextHandleAsync &&
!completionContextUsesConcurrencyFeatures(CurrDeclContext)) {
return;
}
auto getClosureActorIsolation = [this](AbstractClosureExpr *CE) {
// Prefer solution-specific actor-isolations and fall back to the one
// recorded in the AST.
auto isolation = ClosureActorIsolations.find(CE);
if (isolation != ClosureActorIsolations.end()) {
return isolation->second;
} else {
return CE->getActorIsolation();
}
};
auto contextIsolation = getActorIsolationOfContext(
const_cast<DeclContext *>(CurrDeclContext), getClosureActorIsolation);
if (contextIsolation != isolation) {
implicitlyAsync = true;
}
break;
}
case ActorIsolation::Erased:
implicitlyAsync = true;
break;
case ActorIsolation::Unspecified:
case ActorIsolation::Nonisolated:
case ActorIsolation::NonisolatedUnsafe:
case ActorIsolation::Concurrent:
case ActorIsolation::ConcurrentUnsafe:
case ActorIsolation::CallerIsolationInheriting:
return;
}
}
void CompletionLookup::addVarDeclRef(const VarDecl *VD,
DeclVisibilityKind Reason,
DynamicLookupInfo dynamicLookupInfo) {
if (!VD->hasName())
return;
const Identifier Name = VD->getName();
assert(!Name.empty() && "name should not be empty");
Type VarType;
auto SolutionSpecificType = SolutionSpecificVarTypes.find(VD);
if (SolutionSpecificType != SolutionSpecificVarTypes.end()) {
assert(!VarType && "Type recorded in the AST and is also solution-specific?");
VarType = SolutionSpecificType->second;
} else if (VD->hasInterfaceType()) {
VarType = getTypeOfMember(VD, dynamicLookupInfo);
}
std::optional<ContextualNotRecommendedReason> NotRecommended;
// "not recommended" in its own getter.
if (Kind == LookupKind::ValueInDeclContext) {
if (auto accessor = dyn_cast<AccessorDecl>(CurrDeclContext)) {
if (accessor->getStorage() == VD && accessor->isGetter())
NotRecommended =
ContextualNotRecommendedReason::VariableUsedInOwnDefinition;
}
}
bool implicitlyAsync = false;
analyzeActorIsolation(VD, VarType, implicitlyAsync, NotRecommended);
CodeCompletionResultBuilder Builder =
makeResultBuilder(CodeCompletionResultKind::Declaration,
getSemanticContext(VD, Reason, dynamicLookupInfo));
Builder.setCanCurrDeclContextHandleAsync(CanCurrDeclContextHandleAsync);
Builder.setAssociatedDecl(VD);
addLeadingDot(Builder);
addValueBaseName(Builder, Name);
if (NotRecommended)
Builder.setContextualNotRecommended(*NotRecommended);
if (!VarType)
return;
if (auto *PD = dyn_cast<ParamDecl>(VD)) {
if (Name != Ctx.Id_self && PD->isInOut()) {
// It is useful to show inout for function parameters.
// But for 'self' it is just noise.
VarType = InOutType::get(VarType);
}
}
auto DynamicOrOptional =
IsDynamicLookup || VD->getAttrs().hasAttribute<OptionalAttr>();
if (DynamicOrOptional) {
// Values of properties that were found on a AnyObject have
// Optional<T> type. Same applies to optional members.
VarType = OptionalType::get(VarType);
}
auto genericSig =
VD->getInnermostDeclContext()->getGenericSignatureOfContext();
if (VD->isImplicitlyUnwrappedOptional())
addTypeAnnotationForImplicitlyUnwrappedOptional(
Builder, VarType, genericSig, DynamicOrOptional);
else
addTypeAnnotation(Builder, VarType, genericSig);
if (implicitlyAsync)
Builder.addAnnotatedAsync();
if (isUnresolvedMemberIdealType(VarType))
Builder.addFlair(CodeCompletionFlairBit::ExpressionSpecific);
if (auto Accessor = VD->getEffectfulGetAccessor()) {
if (auto AFT = getTypeOfMember(Accessor, dynamicLookupInfo)->getAs<AnyFunctionType>()) {
if (Accessor->hasImplicitSelfDecl()) {
AFT = AFT->getResult()->getAs<AnyFunctionType>();
assert(AFT);
}
addEffectsSpecifiers(Builder, AFT, Accessor);
}
}
}
/// Return whether \p param has a non-desirable default value for code
/// completion.
///
/// 'ClangImporter::Implementation::inferDefaultArgument()' automatically adds
/// default values for some parameters;
/// * NS_OPTIONS enum type with the name '...Options'.
/// * NSDictionary and labeled 'options', 'attributes', or 'userInfo'.
///
/// But sometimes, this behavior isn't really desirable. This function add a
/// heuristic where if a parameter matches all the following condition, we
/// consider the imported default value is _not_ desirable:
/// * it is the first parameter,
/// * it doesn't have an argument label, and
/// * the imported function base name ends with those words
/// For example, ClangImporter imports:
///
/// -(void)addAttributes:(NSDictionary *)attrs, options:(NSDictionary *)opts;
///
/// as:
///
/// func addAttributes(_ attrs: [AnyHashable:Any] = [:],
/// options opts: [AnyHashable:Any] = [:])
///
/// In this case, we don't want 'attrs' defaulted because the function name have
/// 'Attribute' in its name so calling 'value.addAttribute()' doesn't make
/// sense, but we _do_ want to keep 'opts' defaulted.
///
/// Note that:
///
/// -(void)performWithOptions:(NSDictionary *) opts;
///
/// This doesn't match the condition because the base name of the function in
/// Swift is 'peform':
///
/// func perform(options opts: [AnyHashable:Any] = [:])
///
bool isNonDesirableImportedDefaultArg(const ParamDecl *param) {
auto kind = param->getDefaultArgumentKind();
if (kind != DefaultArgumentKind::EmptyArray &&
kind != DefaultArgumentKind::EmptyDictionary)
return false;
if (!param->getArgumentName().empty())
return false;
auto *func = dyn_cast<FuncDecl>(param->getDeclContext());
if (!func->hasClangNode())
return false;
if (func->getParameters()->front() != param)
return false;
if (func->getBaseName().isSpecial())
return false;
auto baseName = func->getBaseName().getIdentifier().str();
switch (kind) {
case DefaultArgumentKind::EmptyArray:
return (baseName.ends_with("Options"));
case DefaultArgumentKind::EmptyDictionary:
return (baseName.ends_with("Options") || baseName.ends_with("Attributes") ||
baseName.ends_with("UserInfo"));
default:
llvm_unreachable("unhandled DefaultArgumentKind");
}
}
bool CompletionLookup::hasInterestingDefaultValue(const ParamDecl *param) {
if (!param)
return false;
switch (param->getDefaultArgumentKind()) {
case DefaultArgumentKind::Normal:
case DefaultArgumentKind::NilLiteral:
case DefaultArgumentKind::StoredProperty:
case DefaultArgumentKind::Inherited:
return true;
case DefaultArgumentKind::EmptyArray:
case DefaultArgumentKind::EmptyDictionary:
if (isNonDesirableImportedDefaultArg(param))
return false;