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ASTContext.cpp
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//===--- ASTContext.cpp - ASTContext Implementation -----------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements the ASTContext class.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "swift/Strings.h"
#include "swift/AST/ArchetypeBuilder.h"
#include "swift/AST/AST.h"
#include "swift/AST/ConcreteDeclRef.h"
#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/ExprHandle.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/KnownProtocols.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/ModuleLoader.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/RawComment.h"
#include "swift/AST/TypeCheckerDebugConsumer.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/StringExtras.h"
#include "clang/AST/DeclObjC.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/Support/Allocator.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include <algorithm>
#include <memory>
using namespace swift;
LazyResolver::~LazyResolver() = default;
void ModuleLoader::anchor() {}
void ClangModuleLoader::anchor() {}
llvm::StringRef swift::getProtocolName(KnownProtocolKind kind) {
switch (kind) {
#define PROTOCOL_WITH_NAME(Id, Name) \
case KnownProtocolKind::Id: \
return Name;
#include "swift/AST/KnownProtocols.def"
}
llvm_unreachable("bad KnownProtocolKind");
}
namespace {
typedef std::tuple<ClassDecl *, ObjCSelector, bool> ObjCMethodConflict;
/// An unsatisfied, optional @objc requirement in a protocol conformance.
typedef std::pair<DeclContext *, AbstractFunctionDecl *>
ObjCUnsatisfiedOptReq;
enum class SearchPathKind : uint8_t {
Import = 1 << 0,
Framework = 1 << 1
};
}
struct ASTContext::Implementation {
Implementation();
~Implementation();
llvm::BumpPtrAllocator Allocator; // used in later initializations
/// The set of cleanups to be called when the ASTContext is destroyed.
std::vector<std::function<void(void)>> Cleanups;
/// The last resolver.
LazyResolver *Resolver = nullptr;
llvm::StringMap<char, llvm::BumpPtrAllocator&> IdentifierTable;
/// The declaration of Swift.Bool.
NominalTypeDecl *BoolDecl = nullptr;
/// The declaration of Swift.Int.
NominalTypeDecl *IntDecl = nullptr;
/// The declaration of Swift.UInt.
NominalTypeDecl *UIntDecl = nullptr;
/// The declaration of Swift.Float.
NominalTypeDecl *FloatDecl = nullptr;
/// The declaration of Swift.Double.
NominalTypeDecl *DoubleDecl = nullptr;
/// The declaration of Swift.String.
NominalTypeDecl *StringDecl = nullptr;
/// The declaration of Swift.Array<T>.
NominalTypeDecl *ArrayDecl = nullptr;
/// The declaration of Swift.Set<T>.
NominalTypeDecl *SetDecl = nullptr;
/// The declaration of Swift.SequenceType<T>.
NominalTypeDecl *SequenceTypeDecl = nullptr;
/// The declaration of Swift.Dictionary<T>.
NominalTypeDecl *DictionaryDecl = nullptr;
/// The declaration of Swift.Optional<T>.
EnumDecl *OptionalDecl = nullptr;
/// The declaration of Swift.Optional<T>.Some.
EnumElementDecl *OptionalSomeDecl = nullptr;
/// The declaration of Swift.Optional<T>.None.
EnumElementDecl *OptionalNoneDecl = nullptr;
/// The declaration of Swift.OptionSetType.
NominalTypeDecl *OptionSetTypeDecl = nullptr;
/// The declaration of Swift.ImplicitlyUnwrappedOptional<T>.Some.
EnumElementDecl *ImplicitlyUnwrappedOptionalSomeDecl = nullptr;
/// The declaration of Swift.ImplicitlyUnwrappedOptional<T>.None.
EnumElementDecl *ImplicitlyUnwrappedOptionalNoneDecl = nullptr;
/// The declaration of Swift.UnsafeMutablePointer<T>.
NominalTypeDecl *UnsafeMutablePointerDecl = nullptr;
VarDecl *UnsafeMutablePointerMemoryDecl = nullptr;
/// The declaration of Swift.UnsafePointer<T>.
NominalTypeDecl *UnsafePointerDecl = nullptr;
VarDecl *UnsafePointerMemoryDecl = nullptr;
/// The declaration of Swift.AutoreleasingUnsafeMutablePointer<T>.
NominalTypeDecl *AutoreleasingUnsafeMutablePointerDecl = nullptr;
VarDecl *AutoreleasingUnsafeMutablePointerMemoryDecl = nullptr;
/// The declaration of Swift.Unmanaged<T>
NominalTypeDecl *UnmanagedDecl = nullptr;
/// The declaration of Swift.Void.
TypeAliasDecl *VoidDecl = nullptr;
/// The declaration of Swift.Any.
TypeAliasDecl *AnyDecl = nullptr;
/// The declaration of ObjectiveC.ObjCBool.
StructDecl *ObjCBoolDecl = nullptr;
// Declare cached declarations for each of the known declarations.
#define FUNC_DECL(Name, Id) FuncDecl *Get##Name = nullptr;
#include "swift/AST/KnownDecls.def"
/// func _doesOptionalHaveValueAsBool<T>(v: Optional<T>) -> Bool
FuncDecl *DoesOptionalHaveValueAsBoolDecls[NumOptionalTypeKinds] = {};
/// func _getOptionalValue<T>(v : Optional<T>) -> T
FuncDecl *GetOptionalValueDecls[NumOptionalTypeKinds] = {};
/// The declaration of Swift.ImplicitlyUnwrappedOptional<T>.
EnumDecl *ImplicitlyUnwrappedOptionalDecl = nullptr;
/// func _getBool(Builtin.Int1) -> Bool
FuncDecl *GetBoolDecl = nullptr;
/// func ==(Int, Int) -> Bool
FuncDecl *EqualIntDecl = nullptr;
/// func _unimplemented_initializer(className: StaticString).
FuncDecl *UnimplementedInitializerDecl = nullptr;
/// func _undefined<T>(msg: StaticString, file: StaticString, line: UInt) -> T
FuncDecl *UndefinedDecl = nullptr;
/// func _stdlib_isOSVersionAtLeast(Builtin.Word,Builtin.Word, Builtin.word)
// -> Builtin.Int1
FuncDecl *IsOSVersionAtLeastDecl = nullptr;
/// \brief The set of known protocols, lazily populated as needed.
ProtocolDecl *KnownProtocols[NumKnownProtocols] = { };
/// \brief The various module loaders that import external modules into this
/// ASTContext.
SmallVector<std::unique_ptr<swift::ModuleLoader>, 4> ModuleLoaders;
/// \brief The module loader used to load Clang modules.
ClangModuleLoader *TheClangModuleLoader = nullptr;
/// \brief Map from Swift declarations to raw comments.
llvm::DenseMap<const Decl *, RawComment> RawComments;
/// \brief Map from Swift declarations to brief comments.
llvm::DenseMap<const Decl *, StringRef> BriefComments;
/// \brief Map from local declarations to their discriminators.
/// Missing entries implicitly have value 0.
llvm::DenseMap<const ValueDecl *, unsigned> LocalDiscriminators;
/// \brief Map from declarations to foreign error conventions.
/// This applies to both actual imported functions and to @objc functions.
llvm::DenseMap<const AbstractFunctionDecl *,
ForeignErrorConvention> ForeignErrorConventions;
/// Map from normal protocol conformances to diagnostics that have
/// been delayed until the conformance is fully checked.
llvm::DenseMap<NormalProtocolConformance *,
std::vector<ASTContext::DelayedConformanceDiag>>
DelayedConformanceDiags;
/// Conformance loaders for declarations that have them.
llvm::DenseMap<Decl *, std::pair<LazyMemberLoader *, uint64_t>>
ConformanceLoaders;
/// \brief A cached unused pattern-binding initializer context.
PatternBindingInitializer *UnusedPatternBindingContext = nullptr;
/// \brief A cached unused default-argument initializer context.
DefaultArgumentInitializer *UnusedDefaultArgumentContext = nullptr;
/// Mapping from archetypes with lazily-resolved nested types to the
/// archetype builder and potential archetype corresponding to that
/// archetype.
llvm::DenseMap<const ArchetypeType *,
std::pair<ArchetypeBuilder *,
ArchetypeBuilder::PotentialArchetype *>>
LazyArchetypes;
/// \brief Stored archetype builders.
llvm::DenseMap<std::pair<GenericSignature *, ModuleDecl *>,
std::unique_ptr<ArchetypeBuilder>> ArchetypeBuilders;
/// The set of property names that show up in the defining module of a
/// class.
llvm::DenseMap<std::pair<const ClassDecl *, char>,
std::unique_ptr<InheritedNameSet>> AllProperties;
/// The set of property names that show up in the defining module of
/// an Objective-C class.
llvm::DenseMap<std::pair<const clang::ObjCInterfaceDecl *, char>,
std::unique_ptr<InheritedNameSet>> AllPropertiesObjC;
/// \brief Structure that captures data that is segregated into different
/// arenas.
struct Arena {
llvm::FoldingSet<TupleType> TupleTypes;
llvm::DenseMap<std::pair<Type,char>, MetatypeType*> MetatypeTypes;
llvm::DenseMap<std::pair<Type,char>,
ExistentialMetatypeType*> ExistentialMetatypeTypes;
llvm::DenseMap<std::pair<Type,std::pair<Type,unsigned>>, FunctionType*>
FunctionTypes;
llvm::DenseMap<Type, ArraySliceType*> ArraySliceTypes;
llvm::DenseMap<std::pair<Type, Type>, DictionaryType *> DictionaryTypes;
llvm::DenseMap<Type, OptionalType*> OptionalTypes;
llvm::DenseMap<Type, ImplicitlyUnwrappedOptionalType*> ImplicitlyUnwrappedOptionalTypes;
llvm::DenseMap<Type, ParenType*> ParenTypes;
llvm::DenseMap<uintptr_t, ReferenceStorageType*> ReferenceStorageTypes;
llvm::DenseMap<Type, LValueType*> LValueTypes;
llvm::DenseMap<Type, InOutType*> InOutTypes;
llvm::DenseMap<std::pair<Type, Type>, SubstitutedType *> SubstitutedTypes;
llvm::DenseMap<std::pair<Type, void*>, DependentMemberType *>
DependentMemberTypes;
llvm::DenseMap<Type, DynamicSelfType *> DynamicSelfTypes;
llvm::FoldingSet<EnumType> EnumTypes;
llvm::FoldingSet<StructType> StructTypes;
llvm::FoldingSet<ClassType> ClassTypes;
llvm::FoldingSet<UnboundGenericType> UnboundGenericTypes;
llvm::FoldingSet<BoundGenericType> BoundGenericTypes;
llvm::DenseMap<std::pair<BoundGenericType *, DeclContext *>,
ArrayRef<Substitution>>
BoundGenericSubstitutions;
/// The set of normal protocol conformances.
llvm::FoldingSet<NormalProtocolConformance> NormalConformances;
/// The set of specialized protocol conformances.
llvm::FoldingSet<SpecializedProtocolConformance> SpecializedConformances;
/// The set of inherited protocol conformances.
llvm::FoldingSet<InheritedProtocolConformance> InheritedConformances;
~Arena() {
for (auto &conformance : SpecializedConformances)
conformance.~SpecializedProtocolConformance();
for (auto &conformance : InheritedConformances)
conformance.~InheritedProtocolConformance();
// Call the normal conformance destructors last since they could be
// referenced by the other conformance types.
for (auto &conformance : NormalConformances)
conformance.~NormalProtocolConformance();
}
size_t getTotalMemory() const;
};
llvm::DenseMap<Module*, ModuleType*> ModuleTypes;
llvm::DenseMap<std::pair<unsigned, unsigned>, GenericTypeParamType *>
GenericParamTypes;
llvm::FoldingSet<GenericFunctionType> GenericFunctionTypes;
llvm::FoldingSet<SILFunctionType> SILFunctionTypes;
llvm::DenseMap<CanType, SILBlockStorageType *> SILBlockStorageTypes;
llvm::DenseMap<CanType, SILBoxType *> SILBoxTypes;
llvm::DenseMap<BuiltinIntegerWidth, BuiltinIntegerType*> IntegerTypes;
llvm::FoldingSet<ProtocolCompositionType> ProtocolCompositionTypes;
llvm::FoldingSet<BuiltinVectorType> BuiltinVectorTypes;
llvm::FoldingSet<GenericSignature> GenericSignatures;
llvm::FoldingSet<DeclName::CompoundDeclName> CompoundNames;
llvm::DenseMap<UUID, ArchetypeType *> OpenedExistentialArchetypes;
/// List of Objective-C member conflicts we have found during type checking.
std::vector<ObjCMethodConflict> ObjCMethodConflicts;
/// List of optional @objc protocol requirements that have gone
/// unsatisfied, which might conflict with other Objective-C methods.
std::vector<ObjCUnsatisfiedOptReq> ObjCUnsatisfiedOptReqs;
/// List of Objective-C methods created by the type checker (and not
/// by the Clang importer or deserialized), which is used for
/// checking unintended Objective-C overrides.
std::vector<AbstractFunctionDecl *> ObjCMethods;
llvm::StringMap<OptionSet<SearchPathKind>> SearchPathsSet;
/// \brief The permanent arena.
Arena Permanent;
/// Temporary arena used for a constraint solver.
struct ConstraintSolverArena : public Arena {
/// The allocator used for all allocations within this arena.
llvm::BumpPtrAllocator &Allocator;
/// Callback used to get a type member of a type variable.
GetTypeVariableMemberCallback GetTypeMember;
ConstraintSolverArena(llvm::BumpPtrAllocator &allocator,
GetTypeVariableMemberCallback &&getTypeMember)
: Allocator(allocator), GetTypeMember(std::move(getTypeMember)) { }
ConstraintSolverArena(const ConstraintSolverArena &) = delete;
ConstraintSolverArena(ConstraintSolverArena &&) = delete;
ConstraintSolverArena &operator=(const ConstraintSolverArena &) = delete;
ConstraintSolverArena &operator=(ConstraintSolverArena &&) = delete;
};
/// \brief The current constraint solver arena, if any.
std::unique_ptr<ConstraintSolverArena> CurrentConstraintSolverArena;
Arena &getArena(AllocationArena arena) {
switch (arena) {
case AllocationArena::Permanent:
return Permanent;
case AllocationArena::ConstraintSolver:
assert(CurrentConstraintSolverArena && "No constraint solver active?");
return *CurrentConstraintSolverArena;
}
llvm_unreachable("bad AllocationArena");
}
};
ASTContext::Implementation::Implementation()
: IdentifierTable(Allocator) {}
ASTContext::Implementation::~Implementation() {
for (auto &cleanup : Cleanups)
cleanup();
}
ConstraintCheckerArenaRAII::
ConstraintCheckerArenaRAII(ASTContext &self, llvm::BumpPtrAllocator &allocator,
GetTypeVariableMemberCallback getTypeMember)
: Self(self), Data(self.Impl.CurrentConstraintSolverArena.release())
{
Self.Impl.CurrentConstraintSolverArena.reset(
new ASTContext::Implementation::ConstraintSolverArena(
allocator,
std::move(getTypeMember)));
}
ConstraintCheckerArenaRAII::~ConstraintCheckerArenaRAII() {
Self.Impl.CurrentConstraintSolverArena.reset(
(ASTContext::Implementation::ConstraintSolverArena *)Data);
}
static Module *createBuiltinModule(ASTContext &ctx) {
auto M = Module::create(ctx.getIdentifier("Builtin"), ctx);
M->addFile(*new (ctx) BuiltinUnit(*M));
return M;
}
ASTContext::ASTContext(LangOptions &langOpts, SearchPathOptions &SearchPathOpts,
SourceManager &SourceMgr, DiagnosticEngine &Diags)
: Impl(*new Implementation()),
LangOpts(langOpts),
SearchPathOpts(SearchPathOpts),
SourceMgr(SourceMgr),
Diags(Diags),
TheBuiltinModule(createBuiltinModule(*this)),
StdlibModuleName(getIdentifier(STDLIB_NAME)),
SwiftShimsModuleName(getIdentifier(SWIFT_SHIMS_NAME)),
TypeCheckerDebug(new StderrTypeCheckerDebugConsumer()),
TheErrorType(new (*this, AllocationArena::Permanent) ErrorType(*this)),
TheUnresolvedType(new (*this, AllocationArena::Permanent)
UnresolvedType(*this)),
TheEmptyTupleType(TupleType::get(ArrayRef<TupleTypeElt>(), *this)),
TheNativeObjectType(new (*this, AllocationArena::Permanent)
BuiltinNativeObjectType(*this)),
TheBridgeObjectType(new (*this, AllocationArena::Permanent)
BuiltinBridgeObjectType(*this)),
TheUnknownObjectType(new (*this, AllocationArena::Permanent)
BuiltinUnknownObjectType(*this)),
TheRawPointerType(new (*this, AllocationArena::Permanent)
BuiltinRawPointerType(*this)),
TheUnsafeValueBufferType(new (*this, AllocationArena::Permanent)
BuiltinUnsafeValueBufferType(*this)),
TheIEEE32Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::IEEE32,*this)),
TheIEEE64Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::IEEE64,*this)),
TheIEEE16Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::IEEE16,*this)),
TheIEEE80Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::IEEE80,*this)),
TheIEEE128Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::IEEE128, *this)),
ThePPC128Type(new (*this, AllocationArena::Permanent)
BuiltinFloatType(BuiltinFloatType::PPC128, *this)) {
// Initialize all of the known identifiers.
#define IDENTIFIER_WITH_NAME(Name, IdStr) Id_##Name = getIdentifier(IdStr);
#include "swift/AST/KnownIdentifiers.def"
// Record the initial set of search paths.
for (StringRef path : SearchPathOpts.ImportSearchPaths)
Impl.SearchPathsSet[path] |= SearchPathKind::Import;
for (StringRef path : SearchPathOpts.FrameworkSearchPaths)
Impl.SearchPathsSet[path] |= SearchPathKind::Framework;
}
ASTContext::~ASTContext() {
delete &Impl;
}
llvm::BumpPtrAllocator &ASTContext::getAllocator(AllocationArena arena) const {
switch (arena) {
case AllocationArena::Permanent:
return Impl.Allocator;
case AllocationArena::ConstraintSolver:
assert(Impl.CurrentConstraintSolverArena.get() != nullptr);
return Impl.CurrentConstraintSolverArena->Allocator;
}
llvm_unreachable("bad AllocationArena");
}
LazyResolver *ASTContext::getLazyResolver() const {
return Impl.Resolver;
}
/// Set the lazy resolver for this context.
void ASTContext::setLazyResolver(LazyResolver *resolver) {
if (resolver) {
assert(Impl.Resolver == nullptr && "already have a resolver");
Impl.Resolver = resolver;
} else {
assert(Impl.Resolver != nullptr && "no resolver to remove");
Impl.Resolver = resolver;
}
}
/// getIdentifier - Return the uniqued and AST-Context-owned version of the
/// specified string.
Identifier ASTContext::getIdentifier(StringRef Str) const {
// Make sure null pointers stay null.
if (Str.data() == nullptr) return Identifier(0);
auto I = Impl.IdentifierTable.insert(std::make_pair(Str, char())).first;
return Identifier(I->getKeyData());
}
void ASTContext::lookupInSwiftModule(
StringRef name,
SmallVectorImpl<ValueDecl *> &results) const {
Module *M = getStdlibModule();
if (!M)
return;
// Find all of the declarations with this name in the Swift module.
auto identifier = getIdentifier(name);
M->lookupValue({ }, identifier, NLKind::UnqualifiedLookup, results);
}
/// Find the generic implementation declaration for the named syntactic-sugar
/// type.
static NominalTypeDecl *findStdlibType(const ASTContext &ctx, StringRef name,
unsigned genericParams) {
// Find all of the declarations with this name in the Swift module.
SmallVector<ValueDecl *, 1> results;
ctx.lookupInSwiftModule(name, results);
for (auto result : results) {
if (auto nominal = dyn_cast<NominalTypeDecl>(result)) {
auto params = nominal->getGenericParams();
if (genericParams == (params == nullptr ? 0 : params->size())) {
// We found it.
return nominal;
}
}
}
return nullptr;
}
NominalTypeDecl *ASTContext::getBoolDecl() const {
if (!Impl.BoolDecl)
Impl.BoolDecl = findStdlibType(*this, "Bool", 0);
return Impl.BoolDecl;
}
NominalTypeDecl *ASTContext::getIntDecl() const {
if (!Impl.IntDecl)
Impl.IntDecl = findStdlibType(*this, "Int", 0);
return Impl.IntDecl;
}
NominalTypeDecl *ASTContext::getUIntDecl() const {
if (!Impl.UIntDecl)
Impl.UIntDecl = findStdlibType(*this, "UInt", 0);
return Impl.UIntDecl;
}
NominalTypeDecl *ASTContext::getFloatDecl() const {
if (!Impl.FloatDecl)
Impl.FloatDecl = findStdlibType(*this, "Float", 0);
return Impl.FloatDecl;
}
NominalTypeDecl *ASTContext::getDoubleDecl() const {
if (!Impl.DoubleDecl)
Impl.DoubleDecl = findStdlibType(*this, "Double", 0);
return Impl.DoubleDecl;
}
NominalTypeDecl *ASTContext::getStringDecl() const {
if (!Impl.StringDecl)
Impl.StringDecl = findStdlibType(*this, "String", 0);
return Impl.StringDecl;
}
CanType ASTContext::getExceptionType() const {
if (auto exn = getExceptionTypeDecl()) {
return exn->getDeclaredType()->getCanonicalType();
} else {
// Use Builtin.NativeObject just as a stand-in.
return TheNativeObjectType;
}
}
NominalTypeDecl *ASTContext::getExceptionTypeDecl() const {
return getProtocol(KnownProtocolKind::ErrorType);
}
NominalTypeDecl *ASTContext::getArrayDecl() const {
if (!Impl.ArrayDecl)
Impl.ArrayDecl = findStdlibType(*this, "Array", 1);
return Impl.ArrayDecl;
}
NominalTypeDecl *ASTContext::getSetDecl() const {
if (!Impl.SetDecl)
Impl.SetDecl = findStdlibType(*this, "Set", 1);
return Impl.SetDecl;
}
NominalTypeDecl *ASTContext::getSequenceTypeDecl() const {
if (!Impl.SequenceTypeDecl)
Impl.SequenceTypeDecl = findStdlibType(*this, "SequenceType", 1);
return Impl.SequenceTypeDecl;
}
NominalTypeDecl *ASTContext::getDictionaryDecl() const {
if (!Impl.DictionaryDecl)
Impl.DictionaryDecl = findStdlibType(*this, "Dictionary", 2);
return Impl.DictionaryDecl;
}
EnumDecl *ASTContext::getOptionalDecl(OptionalTypeKind kind) const {
switch (kind) {
case OTK_None:
llvm_unreachable("not optional");
case OTK_ImplicitlyUnwrappedOptional:
return getImplicitlyUnwrappedOptionalDecl();
case OTK_Optional:
return getOptionalDecl();
}
}
EnumDecl *ASTContext::getOptionalDecl() const {
if (!Impl.OptionalDecl)
Impl.OptionalDecl
= dyn_cast_or_null<EnumDecl>(findStdlibType(*this, "Optional", 1));
return Impl.OptionalDecl;
}
static EnumElementDecl *findEnumElement(EnumDecl *e, StringRef name) {
if (!e) return nullptr;
auto ident = e->getASTContext().getIdentifier(name);
for (auto elt : e->getAllElements()) {
if (elt->getName() == ident)
return elt;
}
return nullptr;
}
EnumElementDecl *ASTContext::getOptionalSomeDecl(OptionalTypeKind kind) const {
switch (kind) {
case OTK_Optional:
return getOptionalSomeDecl();
case OTK_ImplicitlyUnwrappedOptional:
return getImplicitlyUnwrappedOptionalSomeDecl();
case OTK_None:
llvm_unreachable("getting Some decl for non-optional type?");
}
llvm_unreachable("bad OTK");
}
EnumElementDecl *ASTContext::getOptionalNoneDecl(OptionalTypeKind kind) const {
switch (kind) {
case OTK_Optional:
return getOptionalNoneDecl();
case OTK_ImplicitlyUnwrappedOptional:
return getImplicitlyUnwrappedOptionalNoneDecl();
case OTK_None:
llvm_unreachable("getting None decl for non-optional type?");
}
llvm_unreachable("bad OTK");
}
EnumElementDecl *ASTContext::getOptionalSomeDecl() const {
if (!Impl.OptionalSomeDecl)
Impl.OptionalSomeDecl = findEnumElement(getOptionalDecl(), "Some");
return Impl.OptionalSomeDecl;
}
EnumElementDecl *ASTContext::getOptionalNoneDecl() const {
if (!Impl.OptionalNoneDecl)
Impl.OptionalNoneDecl = findEnumElement(getOptionalDecl(), "None");
return Impl.OptionalNoneDecl;
}
EnumDecl *ASTContext::getImplicitlyUnwrappedOptionalDecl() const {
if (!Impl.ImplicitlyUnwrappedOptionalDecl)
Impl.ImplicitlyUnwrappedOptionalDecl
= dyn_cast_or_null<EnumDecl>(
findStdlibType(*this, "ImplicitlyUnwrappedOptional", 1));
return Impl.ImplicitlyUnwrappedOptionalDecl;
}
EnumElementDecl *ASTContext::getImplicitlyUnwrappedOptionalSomeDecl() const {
if (!Impl.ImplicitlyUnwrappedOptionalSomeDecl)
Impl.ImplicitlyUnwrappedOptionalSomeDecl =
findEnumElement(getImplicitlyUnwrappedOptionalDecl(), "Some");
return Impl.ImplicitlyUnwrappedOptionalSomeDecl;
}
EnumElementDecl *ASTContext::getImplicitlyUnwrappedOptionalNoneDecl() const {
if (!Impl.ImplicitlyUnwrappedOptionalNoneDecl)
Impl.ImplicitlyUnwrappedOptionalNoneDecl =
findEnumElement(getImplicitlyUnwrappedOptionalDecl(), "None");
return Impl.ImplicitlyUnwrappedOptionalNoneDecl;
}
NominalTypeDecl *ASTContext::getOptionSetTypeDecl() const {
if (!Impl.OptionSetTypeDecl)
Impl.OptionSetTypeDecl = findStdlibType(*this, "OptionSetType", 1);
return Impl.OptionSetTypeDecl;
}
NominalTypeDecl *ASTContext::getUnsafeMutablePointerDecl() const {
if (!Impl.UnsafeMutablePointerDecl)
Impl.UnsafeMutablePointerDecl = findStdlibType(
*this, "UnsafeMutablePointer", 1);
return Impl.UnsafeMutablePointerDecl;
}
NominalTypeDecl *ASTContext::getUnsafePointerDecl() const {
if (!Impl.UnsafePointerDecl)
Impl.UnsafePointerDecl
= findStdlibType(*this, "UnsafePointer", 1);
return Impl.UnsafePointerDecl;
}
NominalTypeDecl *ASTContext::getAutoreleasingUnsafeMutablePointerDecl() const {
if (!Impl.AutoreleasingUnsafeMutablePointerDecl)
Impl.AutoreleasingUnsafeMutablePointerDecl
= findStdlibType(*this, "AutoreleasingUnsafeMutablePointer", 1);
return Impl.AutoreleasingUnsafeMutablePointerDecl;
}
NominalTypeDecl *ASTContext::getUnmanagedDecl() const {
if (!Impl.UnmanagedDecl)
Impl.UnmanagedDecl = findStdlibType(*this, "Unmanaged", 1);
return Impl.UnmanagedDecl;
}
static VarDecl *getMemoryProperty(VarDecl *&cache,
NominalTypeDecl *(ASTContext::*getNominal)() const,
const ASTContext &ctx) {
if (cache) return cache;
// There must be a generic type with one argument.
NominalTypeDecl *nominal = (ctx.*getNominal)();
if (!nominal) return nullptr;
auto generics = nominal->getGenericParams();
if (!generics) return nullptr;
if (generics->size() != 1) return nullptr;
// There must be a property named "memory".
auto identifier = ctx.getIdentifier("memory");
auto results = nominal->lookupDirect(identifier);
if (results.size() != 1) return nullptr;
// The property must have type T.
VarDecl *property = dyn_cast<VarDecl>(results[0]);
if (!property) return nullptr;
if (!property->getType()->isEqual(generics->getPrimaryArchetypes()[0]))
return nullptr;
cache = property;
return property;
}
VarDecl *
ASTContext::getPointerMemoryPropertyDecl(PointerTypeKind ptrKind) const {
switch (ptrKind) {
case PTK_UnsafeMutablePointer:
return getMemoryProperty(Impl.UnsafeMutablePointerMemoryDecl,
&ASTContext::getUnsafeMutablePointerDecl,
*this);
case PTK_UnsafePointer:
return getMemoryProperty(Impl.UnsafePointerMemoryDecl,
&ASTContext::getUnsafePointerDecl,
*this);
case PTK_AutoreleasingUnsafeMutablePointer:
return getMemoryProperty(Impl.AutoreleasingUnsafeMutablePointerMemoryDecl,
&ASTContext::getAutoreleasingUnsafeMutablePointerDecl,
*this);
}
llvm_unreachable("bad pointer kind");
}
TypeAliasDecl *ASTContext::getVoidDecl() const {
if (Impl.VoidDecl) {
return Impl.VoidDecl;
}
// Go find 'Void' in the Swift module.
SmallVector<ValueDecl *, 1> results;
lookupInSwiftModule("Void", results);
for (auto result : results) {
if (auto typeAlias = dyn_cast<TypeAliasDecl>(result)) {
Impl.VoidDecl = typeAlias;
return typeAlias;
}
}
return Impl.VoidDecl;
}
TypeAliasDecl *ASTContext::getAnyDecl() const {
if (Impl.AnyDecl) {
return Impl.AnyDecl;
}
// Go find 'Any' in the Swift module.
SmallVector<ValueDecl *, 1> results;
lookupInSwiftModule("Any", results);
for (auto result : results) {
if (auto typeAlias = dyn_cast<TypeAliasDecl>(result)) {
Impl.AnyDecl = typeAlias;
break;
}
}
return Impl.AnyDecl;
}
StructDecl *ASTContext::getObjCBoolDecl() {
if (!Impl.ObjCBoolDecl) {
SmallVector<ValueDecl *, 1> results;
if (Module *M = getModuleByName(Id_ObjectiveC.str())) {
M->lookupValue({ }, getIdentifier("ObjCBool"), NLKind::UnqualifiedLookup,
results);
for (auto result : results) {
if (auto structDecl = dyn_cast<StructDecl>(result)) {
if (structDecl->getGenericParams() == nullptr) {
Impl.ObjCBoolDecl = structDecl;
break;
}
}
}
}
}
return Impl.ObjCBoolDecl;
}
ProtocolDecl *ASTContext::getProtocol(KnownProtocolKind kind) const {
// Check whether we've already looked for and cached this protocol.
unsigned index = (unsigned)kind;
assert(index < NumKnownProtocols && "Number of known protocols is wrong");
if (Impl.KnownProtocols[index])
return Impl.KnownProtocols[index];
// Find all of the declarations with this name in the appropriate module.
SmallVector<ValueDecl *, 1> results;
// _BridgedNSError is in the Foundation module.
if (kind == KnownProtocolKind::BridgedNSError) {
Module *foundation = const_cast<ASTContext *>(this)->getModule(
{{Id_Foundation, SourceLoc()}});
if (!foundation)
return nullptr;
auto identifier = getIdentifier(getProtocolName(kind));
foundation->lookupValue({ }, identifier, NLKind::UnqualifiedLookup,
results);
} else {
lookupInSwiftModule(getProtocolName(kind), results);
}
for (auto result : results) {
if (auto protocol = dyn_cast<ProtocolDecl>(result)) {
Impl.KnownProtocols[index] = protocol;
return protocol;
}
}
return nullptr;
}
/// Find the implementation for the given "intrinsic" library function.
static FuncDecl *findLibraryIntrinsic(const ASTContext &ctx,
StringRef name,
LazyResolver *resolver) {
SmallVector<ValueDecl *, 1> results;
ctx.lookupInSwiftModule(name, results);
if (results.size() == 1) {
if (auto FD = dyn_cast<FuncDecl>(results.front())) {
if (resolver)
resolver->resolveDeclSignature(FD);
return FD;
}
}
return nullptr;
}
static CanType stripImmediateLabels(CanType type) {
while (auto tuple = dyn_cast<TupleType>(type)) {
if (tuple->getNumElements() == 1) {
type = tuple.getElementType(0);
} else {
break;
}
}
return type;
}
/// Check whether the given function is non-generic.
static bool isNonGenericIntrinsic(FuncDecl *fn, CanType &input,
CanType &output) {
auto fnType = dyn_cast<FunctionType>(fn->getType()->getCanonicalType());
if (!fnType)
return false;
input = stripImmediateLabels(fnType.getInput());
output = stripImmediateLabels(fnType.getResult());
return true;
}
/// Check whether the given type is Builtin.Int1.
static bool isBuiltinInt1Type(CanType type) {
if (auto intType = dyn_cast<BuiltinIntegerType>(type))
return intType->isFixedWidth() && intType->getFixedWidth() == 1;
return false;
}
/// Check whether the given type is Builtin.Word.
static bool isBuiltinWordType(CanType type) {
if (auto intType = dyn_cast<BuiltinIntegerType>(type))
return intType->getWidth().isPointerWidth();
return false;
}
FuncDecl *ASTContext::getGetBoolDecl(LazyResolver *resolver) const {
if (Impl.GetBoolDecl)
return Impl.GetBoolDecl;
// Look for the function.
CanType input, output;
auto decl = findLibraryIntrinsic(*this, "_getBool", resolver);
if (!decl || !isNonGenericIntrinsic(decl, input, output))
return nullptr;
// Input must be Builtin.Int1
if (!isBuiltinInt1Type(input))
return nullptr;
// Output must be a global type named Bool.
auto nominalType = dyn_cast<NominalType>(output);
if (!nominalType ||
nominalType.getParent() ||
nominalType->getDecl()->getName().str() != "Bool")
return nullptr;
Impl.GetBoolDecl = decl;
return decl;
}
FuncDecl *ASTContext::getEqualIntDecl(LazyResolver *resolver) const {
if (Impl.EqualIntDecl)
return Impl.EqualIntDecl;
CanType intType = getIntDecl()->getDeclaredType().getCanonicalTypeOrNull();
CanType boolType = getBoolDecl()->getDeclaredType().getCanonicalTypeOrNull();
SmallVector<ValueDecl *, 30> equalFuncs;
lookupInSwiftModule("==", equalFuncs);
// Find the overload for Int.
for (ValueDecl *vd : equalFuncs) {
// All "==" decls should be functions, but who knows...
FuncDecl *funcDecl = dyn_cast<FuncDecl>(vd);
if (!funcDecl)
continue;
if (resolver)
resolver->resolveDeclSignature(funcDecl);
CanType input, resultType;
if (!isNonGenericIntrinsic(funcDecl, input, resultType))
continue;
// Check for the signature: (Int, Int) -> Bool
auto tType = dyn_cast<TupleType>(input.getPointer());
assert(tType);
if (tType->getNumElements() != 2)
continue;
CanType argType1 = tType->getElementType(0).getCanonicalTypeOrNull();
CanType argType2 = tType->getElementType(1).getCanonicalTypeOrNull();
if (argType1 == intType && argType2 == intType && resultType == boolType) {
Impl.EqualIntDecl = funcDecl;
return funcDecl;
}
}
return nullptr;
}
FuncDecl *
ASTContext::getUnimplementedInitializerDecl(LazyResolver *resolver) const {
if (Impl.UnimplementedInitializerDecl)
return Impl.UnimplementedInitializerDecl;
// Look for the function.
CanType input, output;
auto decl = findLibraryIntrinsic(*this, "_unimplemented_initializer",
resolver);
if (!decl || !isNonGenericIntrinsic(decl, input, output))
return nullptr;
// FIXME: Check inputs and outputs.
Impl.UnimplementedInitializerDecl = decl;
return decl;
}
FuncDecl *
ASTContext::getUndefinedDecl(LazyResolver *resolver) const {
if (Impl.UndefinedDecl)
return Impl.UndefinedDecl;
// Look for the function.
CanType input, output;
auto decl = findLibraryIntrinsic(*this, "_undefined", resolver);
if (!decl)
return nullptr;