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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 - 2018 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the ASTContext class.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "ClangTypeConverter.h"
#include "ForeignRepresentationInfo.h"
#include "SubstitutionMapStorage.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/ConcreteDeclRef.h"
#include "swift/AST/DiagnosticEngine.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/FileUnit.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/GenericSignatureBuilder.h"
#include "swift/AST/ImportCache.h"
#include "swift/AST/IndexSubset.h"
#include "swift/AST/KnownProtocols.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/ModuleLoader.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/PropertyWrappers.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/RawComment.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/SILLayout.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/TypeCheckerDebugConsumer.h"
#include "swift/Basic/Compiler.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/Statistic.h"
#include "swift/Basic/StringExtras.h"
#include "swift/Syntax/References.h"
#include "swift/Syntax/SyntaxArena.h"
#include "swift/Strings.h"
#include "swift/Subsystems.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Compiler.h"
#include <algorithm>
#include <memory>
using namespace swift;
#define DEBUG_TYPE "ASTContext"
STATISTIC(NumRegisteredGenericSignatureBuilders,
"# of generic signature builders successfully registered");
STATISTIC(NumRegisteredGenericSignatureBuildersAlready,
"# of generic signature builders already registered");
STATISTIC(NumCollapsedSpecializedProtocolConformances,
"# of specialized protocol conformances collapsed");
/// Define this to 1 to enable expensive assertions of the
/// GenericSignatureBuilder.
#define SWIFT_GSB_EXPENSIVE_ASSERTIONS 0
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 {
enum class SearchPathKind : uint8_t {
Import = 1 << 0,
Framework = 1 << 1
};
} // end anonymous namespace
using AssociativityCacheType =
llvm::DenseMap<std::pair<PrecedenceGroupDecl *, PrecedenceGroupDecl *>,
Associativity>;
struct OverrideSignatureKey {
GenericSignature baseMethodSig;
GenericSignature derivedClassSig;
Type superclassTy;
OverrideSignatureKey(GenericSignature baseMethodSignature,
GenericSignature derivedClassSignature,
Type superclassType)
: baseMethodSig(baseMethodSignature),
derivedClassSig(derivedClassSignature), superclassTy(superclassType) {}
};
namespace llvm {
template <> struct DenseMapInfo<OverrideSignatureKey> {
using Type = swift::Type;
using GenericSignature = swift::GenericSignature;
static bool isEqual(const OverrideSignatureKey lhs,
const OverrideSignatureKey rhs) {
return lhs.baseMethodSig.getPointer() == rhs.baseMethodSig.getPointer() &&
lhs.derivedClassSig.getPointer() == rhs.derivedClassSig.getPointer() &&
lhs.superclassTy.getPointer() == rhs.superclassTy.getPointer();
}
static inline OverrideSignatureKey getEmptyKey() {
return OverrideSignatureKey(DenseMapInfo<GenericSignature>::getEmptyKey(),
DenseMapInfo<GenericSignature>::getEmptyKey(),
DenseMapInfo<Type>::getEmptyKey());
}
static inline OverrideSignatureKey getTombstoneKey() {
return OverrideSignatureKey(
DenseMapInfo<GenericSignature>::getTombstoneKey(),
DenseMapInfo<GenericSignature>::getTombstoneKey(),
DenseMapInfo<Type>::getTombstoneKey());
}
static unsigned getHashValue(const OverrideSignatureKey &Val) {
return hash_combine(
DenseMapInfo<GenericSignature>::getHashValue(Val.baseMethodSig),
DenseMapInfo<GenericSignature>::getHashValue(Val.derivedClassSig),
DenseMapInfo<Type>::getHashValue(Val.superclassTy));
}
};
} // namespace llvm
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;
/// A global type checker instance..
TypeChecker *Checker = nullptr;
// FIXME: This is a StringMap rather than a StringSet because StringSet
// doesn't allow passing in a pre-existing allocator.
llvm::StringMap<Identifier::Aligner, llvm::BumpPtrAllocator&>
IdentifierTable;
/// The declaration of Swift.AssignmentPrecedence.
PrecedenceGroupDecl *AssignmentPrecedence = nullptr;
/// The declaration of Swift.CastingPrecedence.
PrecedenceGroupDecl *CastingPrecedence = nullptr;
/// The declaration of Swift.FunctionArrowPrecedence.
PrecedenceGroupDecl *FunctionArrowPrecedence = nullptr;
/// The declaration of Swift.TernaryPrecedence.
PrecedenceGroupDecl *TernaryPrecedence = nullptr;
/// The declaration of Swift.DefaultPrecedence.
PrecedenceGroupDecl *DefaultPrecedence = nullptr;
/// The AnyObject type.
CanType AnyObjectType;
#define KNOWN_STDLIB_TYPE_DECL(NAME, DECL_CLASS, NUM_GENERIC_PARAMS) \
/** The declaration of Swift.NAME. */ \
DECL_CLASS *NAME##Decl = nullptr;
#include "swift/AST/KnownStdlibTypes.def"
#define KNOWN_OBJC_TYPE_DECL(MODULE, NAME, DECL_CLASS) \
/** The declaration of MODULE.NAME. */ \
DECL_CLASS *NAME##Decl = nullptr;
#include "swift/AST/KnownObjCTypes.def"
/// The declaration of '+' function for two RangeReplaceableCollection.
FuncDecl *PlusFunctionOnRangeReplaceableCollection = nullptr;
/// The declaration of '+' function for two String.
FuncDecl *PlusFunctionOnString = nullptr;
/// The declaration of 'Sequence.makeIterator()'.
FuncDecl *MakeIterator = 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.UnsafeMutableRawPointer.memory.
VarDecl *UnsafeMutableRawPointerMemoryDecl = nullptr;
/// The declaration of Swift.UnsafeRawPointer.memory.
VarDecl *UnsafeRawPointerMemoryDecl = nullptr;
/// The declaration of Swift.UnsafeMutablePointer<T>.memory.
VarDecl *UnsafeMutablePointerMemoryDecl = nullptr;
/// The declaration of Swift.UnsafePointer<T>.memory.
VarDecl *UnsafePointerMemoryDecl = nullptr;
/// The declaration of Swift.AutoreleasingUnsafeMutablePointer<T>.memory.
VarDecl *AutoreleasingUnsafeMutablePointerMemoryDecl = 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 ==(Int, Int) -> Bool
FuncDecl *EqualIntDecl = nullptr;
/// func _hashValue<H: Hashable>(for: H) -> Int
FuncDecl *HashValueForDecl = nullptr;
/// func append(Element) -> void
FuncDecl *ArrayAppendElementDecl = nullptr;
/// func reserveCapacityForAppend(newElementsCount: Int)
FuncDecl *ArrayReserveCapacityDecl = nullptr;
/// func _stdlib_isOSVersionAtLeast(Builtin.Word,Builtin.Word, Builtin.word)
// -> Builtin.Int1
FuncDecl *IsOSVersionAtLeastDecl = nullptr;
/// The set of known protocols, lazily populated as needed.
ProtocolDecl *KnownProtocols[NumKnownProtocols] = { };
/// The various module loaders that import external modules into this
/// ASTContext.
SmallVector<std::unique_ptr<swift::ModuleLoader>, 4> ModuleLoaders;
/// Singleton used to cache the import graph.
swift::namelookup::ImportCache TheImportCache;
/// The module loader used to load Clang modules.
ClangModuleLoader *TheClangModuleLoader = nullptr;
/// The module loader used to load Clang modules from DWARF.
ClangModuleLoader *TheDWARFModuleLoader = nullptr;
/// Map from Swift declarations to raw comments.
llvm::DenseMap<const Decl *, RawComment> RawComments;
/// Map from Swift declarations to brief comments.
llvm::DenseMap<const Decl *, StringRef> BriefComments;
/// Map from declarations to foreign error conventions.
/// This applies to both actual imported functions and to @objc functions.
llvm::DenseMap<const AbstractFunctionDecl *,
ForeignErrorConvention> ForeignErrorConventions;
/// Cache of previously looked-up precedence queries.
AssociativityCacheType AssociativityCache;
/// 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;
/// Map from normal protocol conformances to missing witnesses that have
/// been delayed until the conformance is fully checked, so that we can
/// issue a fixit that fills the entire protocol stub.
llvm::DenseMap<NormalProtocolConformance *, std::vector<ValueDecl*>>
DelayedMissingWitnesses;
/// Stores information about lazy deserialization of various declarations.
llvm::DenseMap<const DeclContext *, LazyContextData *> LazyContexts;
/// The single-parameter generic signature with no constraints, <T>.
CanGenericSignature SingleGenericParameterSignature;
/// The existential signature <T : P> for each P.
llvm::DenseMap<CanType, CanGenericSignature> ExistentialSignatures;
/// Overridden declarations.
llvm::DenseMap<const ValueDecl *, ArrayRef<ValueDecl *>> Overrides;
/// Default witnesses.
llvm::DenseMap<std::pair<const ProtocolDecl *, ValueDecl *>, Witness>
DefaultWitnesses;
/// Default type witnesses for protocols.
llvm::DenseMap<std::pair<const ProtocolDecl *, AssociatedTypeDecl *>, Type>
DefaultTypeWitnesses;
/// Default associated conformance witnesses for protocols.
llvm::DenseMap<std::tuple<const ProtocolDecl *, CanType, ProtocolDecl *>,
ProtocolConformanceRef>
DefaultAssociatedConformanceWitnesses;
/// Caches of default types for DefaultTypeRequest.
/// Used to be instance variables in the TypeChecker.
/// There is a logically separate cache for each SourceFile and
/// KnownProtocolKind.
llvm::DenseMap<SourceFile *, std::array<Type, NumKnownProtocols>>
DefaultTypeRequestCaches;
/// Mapping from property declarations to the backing variable types.
llvm::DenseMap<const VarDecl *, Type> PropertyWrapperBackingVarTypes;
/// A mapping from the backing storage of a property that has a wrapper
/// to the original property with the wrapper.
llvm::DenseMap<const VarDecl *, VarDecl *> OriginalWrappedProperties;
/// The builtin initializer witness for a literal. Used when building
/// LiteralExprs in fully-checked AST.
llvm::DenseMap<const NominalTypeDecl *, ConcreteDeclRef> BuiltinInitWitness;
/// Structure that captures data that is segregated into different
/// arenas.
struct Arena {
static_assert(alignof(TypeBase) >= 8, "TypeBase not 8-byte aligned?");
static_assert(alignof(TypeBase) > static_cast<unsigned>(
MetatypeRepresentation::Last_MetatypeRepresentation) + 1,
"Use std::pair for MetatypeTypes and ExistentialMetatypeTypes.");
llvm::DenseMap<Type, ErrorType *> ErrorTypesWithOriginal;
llvm::FoldingSet<TypeAliasType> TypeAliasTypes;
llvm::FoldingSet<TupleType> TupleTypes;
llvm::DenseMap<llvm::PointerIntPair<TypeBase*, 3, unsigned>,
MetatypeType*> MetatypeTypes;
llvm::DenseMap<llvm::PointerIntPair<TypeBase*, 3, unsigned>,
ExistentialMetatypeType*> ExistentialMetatypeTypes;
llvm::DenseMap<Type, ArraySliceType*> ArraySliceTypes;
llvm::DenseMap<std::pair<Type, Type>, DictionaryType *> DictionaryTypes;
llvm::DenseMap<Type, OptionalType*> OptionalTypes;
llvm::DenseMap<Type, ParenType*> SimpleParenTypes; // Most are simple
llvm::DenseMap<std::pair<Type, unsigned>, ParenType*> ParenTypes;
llvm::DenseMap<uintptr_t, ReferenceStorageType*> ReferenceStorageTypes;
llvm::DenseMap<Type, LValueType*> LValueTypes;
llvm::DenseMap<Type, InOutType*> InOutTypes;
llvm::DenseMap<std::pair<Type, void*>, DependentMemberType *>
DependentMemberTypes;
llvm::DenseMap<Type, DynamicSelfType *> DynamicSelfTypes;
llvm::DenseMap<std::pair<EnumDecl*, Type>, EnumType*> EnumTypes;
llvm::DenseMap<std::pair<StructDecl*, Type>, StructType*> StructTypes;
llvm::DenseMap<std::pair<ClassDecl*, Type>, ClassType*> ClassTypes;
llvm::DenseMap<std::pair<ProtocolDecl*, Type>, ProtocolType*> ProtocolTypes;
llvm::FoldingSet<UnboundGenericType> UnboundGenericTypes;
llvm::FoldingSet<BoundGenericType> BoundGenericTypes;
llvm::FoldingSet<ProtocolCompositionType> ProtocolCompositionTypes;
llvm::FoldingSet<LayoutConstraintInfo> LayoutConstraints;
llvm::FoldingSet<OpaqueTypeArchetypeType> OpaqueArchetypes;
llvm::FoldingSet<GenericSignatureImpl> GenericSignatures;
/// Stored generic signature builders for canonical generic signatures.
llvm::DenseMap<GenericSignature, std::unique_ptr<GenericSignatureBuilder>>
GenericSignatureBuilders;
/// The set of function types.
llvm::FoldingSet<FunctionType> FunctionTypes;
/// The set of normal protocol conformances.
llvm::FoldingSet<NormalProtocolConformance> NormalConformances;
// The set of self protocol conformances.
llvm::DenseMap<ProtocolDecl*, SelfProtocolConformance*> SelfConformances;
/// The set of specialized protocol conformances.
llvm::FoldingSet<SpecializedProtocolConformance> SpecializedConformances;
/// The set of inherited protocol conformances.
llvm::FoldingSet<InheritedProtocolConformance> InheritedConformances;
/// The set of substitution maps (uniqued by their storage).
llvm::FoldingSet<SubstitutionMap::Storage> SubstitutionMaps;
~Arena() {
for (auto &conformance : SpecializedConformances)
conformance.~SpecializedProtocolConformance();
// Work around MSVC warning: local variable is initialized but
// not referenced.
#if SWIFT_COMPILER_IS_MSVC
#pragma warning (disable: 4189)
#endif
for (auto &conformance : InheritedConformances)
conformance.~InheritedProtocolConformance();
#if SWIFT_COMPILER_IS_MSVC
#pragma warning (default: 4189)
#endif
// 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<ModuleDecl*, ModuleType*> ModuleTypes;
llvm::DenseMap<std::pair<unsigned, unsigned>, GenericTypeParamType *>
GenericParamTypes;
llvm::FoldingSet<GenericFunctionType> GenericFunctionTypes;
llvm::FoldingSet<SILFunctionType> SILFunctionTypes;
llvm::DenseMap<CanType, SILBlockStorageType *> SILBlockStorageTypes;
llvm::FoldingSet<SILBoxType> SILBoxTypes;
llvm::DenseMap<BuiltinIntegerWidth, BuiltinIntegerType*> IntegerTypes;
llvm::FoldingSet<BuiltinVectorType> BuiltinVectorTypes;
llvm::FoldingSet<DeclName::CompoundDeclName> CompoundNames;
llvm::DenseMap<UUID, OpenedArchetypeType *> OpenedExistentialArchetypes;
/// For uniquifying `IndexSubset` allocations.
llvm::FoldingSet<IndexSubset> IndexSubsets;
/// A cache of information about whether particular nominal types
/// are representable in a foreign language.
llvm::DenseMap<NominalTypeDecl *, ForeignRepresentationInfo>
ForeignRepresentableCache;
llvm::StringMap<OptionSet<SearchPathKind>> SearchPathsSet;
/// 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;
ConstraintSolverArena(llvm::BumpPtrAllocator &allocator)
: Allocator(allocator) { }
ConstraintSolverArena(const ConstraintSolverArena &) = delete;
ConstraintSolverArena(ConstraintSolverArena &&) = delete;
ConstraintSolverArena &operator=(const ConstraintSolverArena &) = delete;
ConstraintSolverArena &operator=(ConstraintSolverArena &&) = delete;
};
/// 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");
}
llvm::FoldingSet<SILLayout> SILLayouts;
RC<syntax::SyntaxArena> TheSyntaxArena;
llvm::DenseMap<OverrideSignatureKey, GenericSignature> overrideSigCache;
Optional<ClangTypeConverter> Converter;
};
ASTContext::Implementation::Implementation()
: IdentifierTable(Allocator),
TheSyntaxArena(new syntax::SyntaxArena()) {}
ASTContext::Implementation::~Implementation() {
for (auto &cleanup : Cleanups)
cleanup();
}
ConstraintCheckerArenaRAII::
ConstraintCheckerArenaRAII(ASTContext &self, llvm::BumpPtrAllocator &allocator)
: Self(self), Data(self.getImpl().CurrentConstraintSolverArena.release())
{
Self.getImpl().CurrentConstraintSolverArena.reset(
new ASTContext::Implementation::ConstraintSolverArena(allocator));
}
ConstraintCheckerArenaRAII::~ConstraintCheckerArenaRAII() {
Self.getImpl().CurrentConstraintSolverArena.reset(
(ASTContext::Implementation::ConstraintSolverArena *)Data);
}
static ModuleDecl *createBuiltinModule(ASTContext &ctx) {
auto M = ModuleDecl::create(ctx.getIdentifier(BUILTIN_NAME), ctx);
M->addFile(*new (ctx) BuiltinUnit(*M));
M->setHasResolvedImports();
return M;
}
inline ASTContext::Implementation &ASTContext::getImpl() const {
auto pointer = reinterpret_cast<char*>(const_cast<ASTContext*>(this));
auto offset = llvm::alignAddr((void*)sizeof(*this), alignof(Implementation));
return *reinterpret_cast<Implementation*>(pointer + offset);
}
void ASTContext::operator delete(void *Data) throw() {
AlignedFree(Data);
}
ASTContext *ASTContext::get(LangOptions &langOpts,
TypeCheckerOptions &typeckOpts,
SearchPathOptions &SearchPathOpts,
SourceManager &SourceMgr,
DiagnosticEngine &Diags) {
// If more than two data structures are concatentated, then the aggregate
// size math needs to become more complicated due to per-struct alignment
// constraints.
auto align = std::max(alignof(ASTContext), alignof(Implementation));
auto size = llvm::alignTo(sizeof(ASTContext) + sizeof(Implementation), align);
auto mem = AlignedAlloc(size, align);
auto impl = reinterpret_cast<void*>((char*)mem + sizeof(ASTContext));
impl = reinterpret_cast<void*>(llvm::alignAddr(impl,alignof(Implementation)));
new (impl) Implementation();
return new (mem)
ASTContext(langOpts, typeckOpts, SearchPathOpts, SourceMgr, Diags);
}
ASTContext::ASTContext(LangOptions &langOpts, TypeCheckerOptions &typeckOpts,
SearchPathOptions &SearchPathOpts,
SourceManager &SourceMgr, DiagnosticEngine &Diags)
: LangOpts(langOpts),
TypeCheckerOpts(typeckOpts),
SearchPathOpts(SearchPathOpts), SourceMgr(SourceMgr), Diags(Diags),
evaluator(Diags,
langOpts.DebugDumpCycles,
langOpts.BuildRequestDependencyGraph),
TheBuiltinModule(createBuiltinModule(*this)),
StdlibModuleName(getIdentifier(STDLIB_NAME)),
SwiftShimsModuleName(getIdentifier(SWIFT_SHIMS_NAME)),
TypeCheckerDebug(new StderrTypeCheckerDebugConsumer()),
TheErrorType(
new (*this, AllocationArena::Permanent)
ErrorType(*this, Type(), RecursiveTypeProperties::HasError)),
TheUnresolvedType(new (*this, AllocationArena::Permanent)
UnresolvedType(*this)),
TheEmptyTupleType(TupleType::get(ArrayRef<TupleTypeElt>(), *this)),
TheAnyType(ProtocolCompositionType::get(*this, ArrayRef<Type>(),
/*HasExplicitAnyObject=*/false)),
TheNativeObjectType(new (*this, AllocationArena::Permanent)
BuiltinNativeObjectType(*this)),
TheBridgeObjectType(new (*this, AllocationArena::Permanent)
BuiltinBridgeObjectType(*this)),
TheRawPointerType(new (*this, AllocationArena::Permanent)
BuiltinRawPointerType(*this)),
TheUnsafeValueBufferType(new (*this, AllocationArena::Permanent)
BuiltinUnsafeValueBufferType(*this)),
TheSILTokenType(new (*this, AllocationArena::Permanent)
SILTokenType(*this)),
TheIntegerLiteralType(new (*this, AllocationArena::Permanent)
BuiltinIntegerLiteralType(*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)
getImpl().SearchPathsSet[path] |= SearchPathKind::Import;
for (const auto &framepath : SearchPathOpts.FrameworkSearchPaths)
getImpl().SearchPathsSet[framepath.Path] |= SearchPathKind::Framework;
// Register any request-evaluator functions available at the AST layer.
registerAccessRequestFunctions(evaluator);
registerNameLookupRequestFunctions(evaluator);
}
ASTContext::~ASTContext() {
// Emit evaluator dependency graph if requested.
auto graphPath = LangOpts.RequestEvaluatorGraphVizPath;
if (!graphPath.empty()) {
evaluator.emitRequestEvaluatorGraphViz(graphPath);
}
getImpl().~Implementation();
}
llvm::BumpPtrAllocator &ASTContext::getAllocator(AllocationArena arena) const {
switch (arena) {
case AllocationArena::Permanent:
return getImpl().Allocator;
case AllocationArena::ConstraintSolver:
assert(getImpl().CurrentConstraintSolverArena != nullptr);
return getImpl().CurrentConstraintSolverArena->Allocator;
}
llvm_unreachable("bad AllocationArena");
}
/// Set a new stats reporter.
void ASTContext::setStatsReporter(UnifiedStatsReporter *stats) {
Stats = stats;
evaluator.setStatsReporter(stats);
if (stats) {
stats->getFrontendCounters().NumASTBytesAllocated =
getAllocator().getBytesAllocated();
}
}
RC<syntax::SyntaxArena> ASTContext::getSyntaxArena() const {
return getImpl().TheSyntaxArena;
}
bool ASTContext::areSemanticQueriesEnabled() const {
return getLegacyGlobalTypeChecker() != nullptr;
}
TypeChecker *ASTContext::getLegacyGlobalTypeChecker() const {
return getImpl().Checker;
}
void ASTContext::installGlobalTypeChecker(TypeChecker *TC) {
assert(!getImpl().Checker);
getImpl().Checker = TC;
}
/// 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(nullptr);
auto pair = std::make_pair(Str, Identifier::Aligner());
auto I = getImpl().IdentifierTable.insert(pair).first;
return Identifier(I->getKeyData());
}
void ASTContext::lookupInSwiftModule(
StringRef name,
SmallVectorImpl<ValueDecl *> &results) const {
ModuleDecl *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);
}
FuncDecl *ASTContext::getPlusFunctionOnRangeReplaceableCollection() const {
if (getImpl().PlusFunctionOnRangeReplaceableCollection) {
return getImpl().PlusFunctionOnRangeReplaceableCollection;
}
// Find all of the declarations with this name in the Swift module.
SmallVector<ValueDecl *, 1> Results;
lookupInSwiftModule("+", Results);
for (auto Result : Results) {
if (auto *FD = dyn_cast<FuncDecl>(Result)) {
if (!FD->getOperatorDecl())
continue;
for (auto Req: FD->getGenericRequirements()) {
if (Req.getKind() == RequirementKind::Conformance &&
Req.getSecondType()->getNominalOrBoundGenericNominal() ==
getRangeReplaceableCollectionDecl()) {
getImpl().PlusFunctionOnRangeReplaceableCollection = FD;
}
}
}
}
return getImpl().PlusFunctionOnRangeReplaceableCollection;
}
FuncDecl *ASTContext::getPlusFunctionOnString() const {
if (getImpl().PlusFunctionOnString) {
return getImpl().PlusFunctionOnString;
}
// Find all of the declarations with this name in the Swift module.
SmallVector<ValueDecl *, 1> Results;
lookupInSwiftModule("+", Results);
for (auto Result : Results) {
if (auto *FD = dyn_cast<FuncDecl>(Result)) {
if (!FD->getOperatorDecl())
continue;
auto ResultType = FD->getResultInterfaceType();
if (ResultType->getNominalOrBoundGenericNominal() != getStringDecl())
continue;
auto ParamList = FD->getParameters();
if (ParamList->size() != 2)
continue;
auto CheckIfStringParam = [this](ParamDecl* Param) {
auto Type = Param->getInterfaceType()->getNominalOrBoundGenericNominal();
return Type == getStringDecl();
};
if (CheckIfStringParam(ParamList->get(0)) &&
CheckIfStringParam(ParamList->get(1))) {
getImpl().PlusFunctionOnString = FD;
break;
}
}
}
return getImpl().PlusFunctionOnString;
}
FuncDecl *ASTContext::getSequenceMakeIterator() const {
if (getImpl().MakeIterator) {
return getImpl().MakeIterator;
}
auto proto = getProtocol(KnownProtocolKind::Sequence);
if (!proto)
return nullptr;
for (auto result : proto->lookupDirect(Id_makeIterator)) {
if (result->getDeclContext() != proto)
continue;
if (auto func = dyn_cast<FuncDecl>(result)) {
if (func->getParameters()->size() != 0)
continue;
getImpl().MakeIterator = func;
return func;
}
}
return nullptr;
}
#define KNOWN_STDLIB_TYPE_DECL(NAME, DECL_CLASS, NUM_GENERIC_PARAMS) \
DECL_CLASS *ASTContext::get##NAME##Decl() const { \
if (getImpl().NAME##Decl) \
return getImpl().NAME##Decl; \
SmallVector<ValueDecl *, 1> results; \
lookupInSwiftModule(#NAME, results); \
for (auto result : results) { \
if (auto type = dyn_cast<DECL_CLASS>(result)) { \
auto params = type->getGenericParams(); \
if (NUM_GENERIC_PARAMS == (params == nullptr ? 0 : params->size())) { \
getImpl().NAME##Decl = type; \
return type; \
} \
} \
} \
return nullptr; \
}
#include "swift/AST/KnownStdlibTypes.def"
CanType ASTContext::getExceptionType() const {
if (auto exn = getErrorDecl()) {
return exn->getDeclaredType()->getCanonicalType();
} else {
// Use Builtin.NativeObject just as a stand-in.
return TheNativeObjectType;
}
}
ProtocolDecl *ASTContext::getErrorDecl() const {
return getProtocol(KnownProtocolKind::Error);
}
EnumElementDecl *ASTContext::getOptionalSomeDecl() const {
if (!getImpl().OptionalSomeDecl)
getImpl().OptionalSomeDecl = getOptionalDecl()->getUniqueElement(/*hasVal*/true);
return getImpl().OptionalSomeDecl;
}
EnumElementDecl *ASTContext::getOptionalNoneDecl() const {
if (!getImpl().OptionalNoneDecl)
getImpl().OptionalNoneDecl =getOptionalDecl()->getUniqueElement(/*hasVal*/false);
return getImpl().OptionalNoneDecl;
}
static VarDecl *getPointeeProperty(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 sig = nominal->getGenericSignature();
if (!sig) return nullptr;
if (sig->getGenericParams().size() != 1) return nullptr;
// There must be a property named "pointee".
auto identifier = ctx.getIdentifier("pointee");
auto results = nominal->lookupDirect(identifier);
if (results.size() != 1) return nullptr;
// The property must have type T.
auto *property = dyn_cast<VarDecl>(results[0]);
if (!property) return nullptr;
if (!property->getInterfaceType()->isEqual(sig->getGenericParams()[0]))
return nullptr;
cache = property;
return property;
}
VarDecl *
ASTContext::getPointerPointeePropertyDecl(PointerTypeKind ptrKind) const {
switch (ptrKind) {
case PTK_UnsafeMutableRawPointer:
return getPointeeProperty(getImpl().UnsafeMutableRawPointerMemoryDecl,
&ASTContext::getUnsafeMutableRawPointerDecl,
*this);
case PTK_UnsafeRawPointer:
return getPointeeProperty(getImpl().UnsafeRawPointerMemoryDecl,
&ASTContext::getUnsafeRawPointerDecl,
*this);
case PTK_UnsafeMutablePointer:
return getPointeeProperty(getImpl().UnsafeMutablePointerMemoryDecl,
&ASTContext::getUnsafeMutablePointerDecl,
*this);
case PTK_UnsafePointer:
return getPointeeProperty(getImpl().UnsafePointerMemoryDecl,
&ASTContext::getUnsafePointerDecl,
*this);
case PTK_AutoreleasingUnsafeMutablePointer:
return getPointeeProperty(getImpl().AutoreleasingUnsafeMutablePointerMemoryDecl,
&ASTContext::getAutoreleasingUnsafeMutablePointerDecl,
*this);
}
llvm_unreachable("bad pointer kind");
}
CanType ASTContext::getAnyObjectType() const {
if (getImpl().AnyObjectType) {
return getImpl().AnyObjectType;
}
getImpl().AnyObjectType = CanType(
ProtocolCompositionType::get(
*this, {}, /*HasExplicitAnyObject=*/true));
return getImpl().AnyObjectType;
}
CanType ASTContext::getNeverType() const {
auto neverDecl = getNeverDecl();
if (!neverDecl)
return CanType();
return neverDecl->getDeclaredType()->getCanonicalType();
}
#define KNOWN_OBJC_TYPE_DECL(MODULE, NAME, DECLTYPE) \
DECLTYPE *ASTContext::get##NAME##Decl() const { \
if (!getImpl().NAME##Decl) { \
if (ModuleDecl *M = getLoadedModule(Id_##MODULE)) { \
/* Note: lookupQualified() will search both the Swift overlay \
* and the Clang module it imports. */ \
SmallVector<ValueDecl *, 1> decls; \
M->lookupQualified(M, DeclNameRef(getIdentifier(#NAME)), NL_OnlyTypes, \
decls); \
if (decls.size() == 1 && isa<DECLTYPE>(decls[0])) { \
auto decl = cast<DECLTYPE>(decls[0]); \
if (isa<ProtocolDecl>(decl) || decl->getGenericParams() == nullptr) { \
getImpl().NAME##Decl = decl; \
} \
} \
} \
} \
\
return getImpl().NAME##Decl; \
} \
\
Type ASTContext::get##NAME##Type() const { \
auto *decl = get##NAME##Decl(); \
if (!decl) \
return Type(); \
return decl->getDeclaredInterfaceType(); \
}
#include "swift/AST/KnownObjCTypes.def"
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 (getImpl().KnownProtocols[index])
return getImpl().KnownProtocols[index];
// Find all of the declarations with this name in the appropriate module.
SmallVector<ValueDecl *, 1> results;
const ModuleDecl *M;
switch (kind) {
case KnownProtocolKind::BridgedNSError:
case KnownProtocolKind::BridgedStoredNSError:
case KnownProtocolKind::ErrorCodeProtocol:
M = getLoadedModule(Id_Foundation);
break;
case KnownProtocolKind::CFObject:
M = getLoadedModule(Id_CoreFoundation);
break;
case KnownProtocolKind::Differentiable:
M = getLoadedModule(Id_Differentiation);
break;
default:
M = getStdlibModule();
break;
}
if (!M)
return nullptr;
M->lookupValue(getIdentifier(getProtocolName(kind)),
NLKind::UnqualifiedLookup, results);
for (auto result : results) {
if (auto protocol = dyn_cast<ProtocolDecl>(result)) {
getImpl().KnownProtocols[index] = protocol;
return protocol;
}
}
return nullptr;
}
/// Find the implementation for the given "intrinsic" library function.
static FuncDecl *findLibraryIntrinsic(const ASTContext &ctx,
StringRef name) {
SmallVector<ValueDecl *, 1> results;
ctx.lookupInSwiftModule(name, results);
if (results.size() == 1)
return dyn_cast_or_null<FuncDecl>(results.front());
return nullptr;
}
/// Returns the type of an intrinsic function if it is not generic, otherwise
/// returns nullptr.
static FunctionType *
getIntrinsicCandidateType(FuncDecl *fn, bool allowTypeMembers) {
auto type = fn->getInterfaceType();
if (allowTypeMembers && fn->getDeclContext()->isTypeContext()) {
auto fnType = type->getAs<FunctionType>();
if (!fnType) return nullptr;
type = fnType->getResult();
}
return type->getAs<FunctionType>();
}
/// Check whether the given type is Builtin.Int1.
static bool isBuiltinInt1Type(Type type) {
if (auto intType = type->getAs<BuiltinIntegerType>())
return intType->isFixedWidth() && intType->getFixedWidth() == 1;
return false;
}
/// Check whether the given type is Builtin.Word.
static bool isBuiltinWordType(Type type) {
if (auto intType = type->getAs<BuiltinIntegerType>())
return intType->getWidth().isPointerWidth();
return false;
}
/// Looks up all implementations of an operator (globally and declared in types)
/// and passes potential matches to the given callback. The search stops when
/// the predicate returns true (in which case the matching function declaration
/// is returned); otherwise, nullptr is returned if there are no matches.
/// \p C The AST context.
/// \p oper The name of the operator.
/// \p contextType If the operator is declared on a type, then only operators
/// defined on this type should be considered.
/// \p pred A callback predicate that takes as its argument the type of a
/// candidate function declaration and returns true if the function matches
/// the desired criteria.
/// \return The matching function declaration, or nullptr if there was no match.
static FuncDecl *
lookupOperatorFunc(const ASTContext &ctx, StringRef oper, Type contextType,
llvm::function_ref<bool(FunctionType *)> pred) {
SmallVector<ValueDecl *, 32> candidates;
ctx.lookupInSwiftModule(oper, candidates);
for (auto candidate : candidates) {
// All operator declarations should be functions, but make sure.
auto *fnDecl = dyn_cast<FuncDecl>(candidate);
if (!fnDecl)
continue;
if (fnDecl->getDeclContext()->isTypeContext()) {
auto contextTy = fnDecl->getDeclContext()->getDeclaredInterfaceType();
if (!contextTy->isEqual(contextType)) continue;
}
auto *funcTy = getIntrinsicCandidateType(fnDecl, /*allowTypeMembers=*/true);
if (!funcTy)