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DeclContext.h
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//===--- DeclContext.h - Swift Language Context ASTs ------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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 defines the DeclContext class. A DeclContext is the semantic
// construct that a declaration belongs to, such as the enclosing
// AbstractClosureExpr or declaration.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_DECLCONTEXT_H
#define SWIFT_DECLCONTEXT_H
#include "swift/AST/Identifier.h"
#include "swift/AST/LookupKinds.h"
#include "swift/AST/ResilienceExpansion.h"
#include "swift/AST/TypeAlignments.h"
#include "swift/Basic/LLVM.h"
#include "swift/Basic/SourceLoc.h"
#include "swift/Basic/STLExtras.h"
#include "llvm/ADT/PointerEmbeddedInt.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/PointerUnion.h"
namespace llvm {
class raw_ostream;
}
namespace swift {
class AbstractFunctionDecl;
class GenericEnvironment;
class ASTContext;
class ASTWalker;
class CanType;
class Decl;
class DeclContext;
class EnumDecl;
class ExtensionDecl;
class Expr;
class GenericParamList;
class LazyResolver;
class LazyMemberLoader;
class GenericSignature;
class GenericTypeParamDecl;
class GenericTypeParamType;
class ProtocolDecl;
class Requirement;
class SourceFile;
class Type;
class ModuleDecl;
class GenericTypeDecl;
class NominalTypeDecl;
class ProtocolConformance;
class ValueDecl;
class Initializer;
class ClassDecl;
class SerializedAbstractClosureExpr;
class SerializedPatternBindingInitializer;
class SerializedDefaultArgumentInitializer;
class SerializedTopLevelCodeDecl;
class StructDecl;
namespace serialization {
using DeclID = llvm::PointerEmbeddedInt<unsigned, 31>;
}
enum class DeclContextKind : unsigned {
AbstractClosureExpr,
Initializer,
TopLevelCodeDecl,
SubscriptDecl,
AbstractFunctionDecl,
SerializedLocal,
Last_LocalDeclContextKind = SerializedLocal,
Module,
FileUnit,
GenericTypeDecl,
ExtensionDecl,
Last_DeclContextKind = ExtensionDecl
};
/// Kinds of DeclContexts after deserialization.
///
/// \see SerializedLocalDeclContext.
enum class LocalDeclContextKind : uint8_t {
AbstractClosure,
PatternBindingInitializer,
DefaultArgumentInitializer,
TopLevelCodeDecl
};
/// Describes the kind of a particular conformance.
///
/// The following code involves conformances of the three different kinds:
/// \code
/// protocol P { }
/// protocol P2 : P { }
///
/// class Super : P2 { }
/// class Sub : Super { }
/// \endcode
///
/// \c Super conforms to \c P2 via an explicit conformance,
/// specified on the class declaration itself.
///
/// \c Super conforms to \c P via an implied conformance, whose
/// origin is the explicit conformance to \c P2.
///
/// \c Sub conforms to \c P2 and \c P via inherited conformances,
/// which link back to the conformances described above.
///
/// The enumerators are ordered in terms of decreasing preference:
/// an inherited conformance is best, followed by explicit
/// conformances, then implied conformances. Earlier conformance
/// kinds supersede later conformance kinds, possibly with a
/// diagnostic (e.g., if an inherited conformance supersedes an
/// explicit conformance).
enum class ConformanceEntryKind : unsigned {
/// Inherited from a superclass conformance.
Inherited,
/// Explicitly specified.
Explicit,
/// Implied by an explicitly-specified conformance.
Implied,
/// Implicitly synthesized.
Synthesized,
};
/// Describes the kind of conformance lookup desired.
enum class ConformanceLookupKind : unsigned {
/// All conformances.
All,
/// Only the explicit conformance.
OnlyExplicit,
};
/// Describes a diagnostic for a conflict between two protocol
/// conformances.
struct ConformanceDiagnostic {
/// The protocol with conflicting conformances.
ProtocolDecl *Protocol;
/// The location at which the diagnostic should occur.
SourceLoc Loc;
/// The kind of conformance that was superseded.
ConformanceEntryKind Kind;
/// The explicitly-specified protocol whose conformance implied the
/// conflicting conformance.
ProtocolDecl *ExplicitProtocol;
/// The declaration context that declares the existing conformance.
DeclContext *ExistingDC;
/// The kind of existing conformance.
ConformanceEntryKind ExistingKind;
/// The explicitly-specified protocol whose conformance implied the
/// existing conflicting conformance.
ProtocolDecl *ExistingExplicitProtocol;
};
/// A DeclContext is an AST object which acts as a semantic container
/// for declarations. As a policy matter, we currently define
/// contexts broadly: a lambda expression in a function is a new
/// DeclContext, but a new brace statement is not. There's no
/// particular mandate for this, though.
///
/// Please note that DeclContext assumes that it prefaces AST type hierarchies
/// and therefore can safely access trailing memory. If you need to create a
/// macro context, please see GenericContext for how to minimize new entries in
/// the ASTHierarchy enum below.
class alignas(1 << DeclContextAlignInBits) DeclContext {
enum class ASTHierarchy : unsigned {
Decl,
Expr,
FileUnit,
Initializer,
SerializedLocal,
// If you add a new AST hierarchies, then update the static_assert() below.
};
static_assert(unsigned(ASTHierarchy::SerializedLocal) <
(1 << DeclContextAlignInBits),
"ASTHierarchy exceeds bits available");
llvm::PointerIntPair<DeclContext*, 3, ASTHierarchy> ParentAndKind;
/// Change the parent of this context. This should only be used
/// very carefully.
void setParent(DeclContext *parent) { ParentAndKind.setPointer(parent); }
friend class Initializer; // uses setParent
friend class AutoClosureExpr; // uses setParent
friend class AbstractClosureExpr; // uses setParent
template<class A, class B, class C>
friend struct ::llvm::cast_convert_val;
// See swift/AST/Decl.h
static DeclContext *castDeclToDeclContext(const Decl *D);
/// If this DeclContext is a GenericType declaration or an
/// extension thereof, return the GenericTypeDecl.
GenericTypeDecl *getAsTypeOrTypeExtensionContext() const;
static ASTHierarchy getASTHierarchyFromKind(DeclContextKind Kind) {
switch (Kind) {
case DeclContextKind::AbstractClosureExpr:
return ASTHierarchy::Expr;
case DeclContextKind::Initializer:
return ASTHierarchy::Initializer;
case DeclContextKind::SerializedLocal:
return ASTHierarchy::SerializedLocal;
case DeclContextKind::FileUnit:
return ASTHierarchy::FileUnit;
case DeclContextKind::Module:
case DeclContextKind::TopLevelCodeDecl:
case DeclContextKind::AbstractFunctionDecl:
case DeclContextKind::SubscriptDecl:
case DeclContextKind::GenericTypeDecl:
case DeclContextKind::ExtensionDecl:
return ASTHierarchy::Decl;
}
llvm_unreachable("Unhandled DeclContextKind");
}
public:
Decl *getAsDeclOrDeclExtensionContext() {
return ParentAndKind.getInt() == ASTHierarchy::Decl ?
reinterpret_cast<Decl*>(this + 1) : nullptr;
}
const Decl *getAsDeclOrDeclExtensionContext() const {
return const_cast<DeclContext*>(this)->getAsDeclOrDeclExtensionContext();
}
DeclContext(DeclContextKind Kind, DeclContext *Parent)
: ParentAndKind(Parent, getASTHierarchyFromKind(Kind)) {
if (Kind != DeclContextKind::Module)
assert(Parent != nullptr && "DeclContext must have a parent context");
}
/// Returns the kind of context this is.
DeclContextKind getContextKind() const;
/// Determines whether this context is itself a local scope in a
/// code block. A context that appears in such a scope, like a
/// local type declaration, does not itself become a local context.
bool isLocalContext() const {
return getContextKind() <= DeclContextKind::Last_LocalDeclContextKind;
}
/// isModuleContext - Return true if this is a subclass of Module.
bool isModuleContext() const {
return getContextKind() == DeclContextKind::Module;
}
/// \returns true if this is a context with module-wide scope, e.g. a module
/// or a source file.
bool isModuleScopeContext() const {
return getContextKind() == DeclContextKind::Module ||
getContextKind() == DeclContextKind::FileUnit;
}
/// \returns true if this is a type context, e.g., a struct, a class, an
/// enum, a protocol, or an extension.
bool isTypeContext() const;
/// \brief Determine whether this is an extension context.
bool isExtensionContext() const {
return getContextKind() == DeclContextKind::ExtensionDecl;
}
/// If this DeclContext is a NominalType declaration or an
/// extension thereof, return the NominalTypeDecl.
NominalTypeDecl *getAsNominalTypeOrNominalTypeExtensionContext() const;
/// If this DeclContext is a class, or an extension on a class, return the
/// ClassDecl, otherwise return null.
ClassDecl *getAsClassOrClassExtensionContext() const;
/// If this DeclContext is an enum, or an extension on an enum, return the
/// EnumDecl, otherwise return null.
EnumDecl *getAsEnumOrEnumExtensionContext() const;
/// If this DeclContext is a struct, or an extension on a struct, return the
/// StructDecl, otherwise return null.
StructDecl *getAsStructOrStructExtensionContext() const;
/// If this DeclContext is a protocol, or an extension on a
/// protocol, return the ProtocolDecl, otherwise return null.
ProtocolDecl *getAsProtocolOrProtocolExtensionContext() const;
/// If this DeclContext is a protocol extension, return the extended protocol.
ProtocolDecl *getAsProtocolExtensionContext() const;
/// \brief Retrieve the generic parameter 'Self' from a protocol or
/// protocol extension.
///
/// Only valid if \c getAsProtocolOrProtocolExtensionContext().
GenericTypeParamType *getProtocolSelfType() const;
/// Gets the type being declared by this context.
///
/// - Generic types return a bound generic type using archetypes.
/// - Non-type contexts return a null type.
Type getDeclaredTypeInContext() const;
/// Gets the type being declared by this context.
///
/// - Generic types return a bound generic type using interface types.
/// - Non-type contexts return a null type.
Type getDeclaredInterfaceType() const;
/// Get the type of `self` in this context.
///
/// - Protocol types return the `Self` archetype.
/// - Everything else falls back on getDeclaredTypeInContext().
Type getSelfTypeInContext() const;
/// Get the type of `self` in this context.
///
/// - Protocol types return the `Self` interface type.
/// - Everything else falls back on getDeclaredInterfaceType().
Type getSelfInterfaceType() const;
/// \brief Retrieve the innermost generic parameters of this context or any
/// of its parents.
///
/// FIXME: Remove this
GenericParamList *getGenericParamsOfContext() const;
/// \brief Retrieve the innermost generic signature of this context or any
/// of its parents.
GenericSignature *getGenericSignatureOfContext() const;
/// \brief Retrieve the innermost archetypes of this context or any
/// of its parents.
GenericEnvironment *getGenericEnvironmentOfContext() const;
/// Whether the context has a generic environment that will be constructed
/// on first access (but has not yet been constructed).
bool contextHasLazyGenericEnvironment() const;
/// Map an interface type to a contextual type within this context.
Type mapTypeIntoContext(Type type) const;
/// Returns this or the first local parent context, or nullptr if it is not
/// contained in one.
DeclContext *getLocalContext();
const DeclContext *getLocalContext() const {
return const_cast<DeclContext*>(this)->getLocalContext();
}
/// Returns the innermost method context.
///
/// This routine looks through closure, initializer, and local function
/// contexts to find the innermost method (including constructors and
/// destructors).
///
/// \returns the innermost method, or null if there is no such method.
AbstractFunctionDecl *getInnermostMethodContext();
const AbstractFunctionDecl *getInnermostMethodContext() const {
return const_cast<DeclContext*>(this)->getInnermostMethodContext();
}
/// Returns the innermost type context.
///
/// This routine looks through closure, initializer, and local function
/// contexts to find the innermost type context -- nominal type or
/// extension.
DeclContext *getInnermostTypeContext();
const DeclContext *getInnermostTypeContext() const {
return const_cast<DeclContext *>(this)->getInnermostTypeContext();
}
/// Returns the innermost context that is a declaration.
///
/// This routine looks through contexts to find the innermost
/// declaration context that is itself a declaration.
Decl *getInnermostDeclarationDeclContext();
const Decl *getInnermostDeclarationDeclContext() const {
return
const_cast<DeclContext *>(this)->getInnermostDeclarationDeclContext();
}
/// Returns the semantic parent of this context. A context has a
/// parent if and only if it is not a module context.
DeclContext *getParent() const {
return ParentAndKind.getPointer();
}
/// Returns the semantic parent for purposes of name lookup.
DeclContext *getParentForLookup() const;
/// Return true if this is a child of the specified other decl context.
bool isChildContextOf(const DeclContext *Other) const {
if (this == Other) return false;
for (const DeclContext *CurContext = this; CurContext;
CurContext = CurContext->getParent())
if (CurContext == Other)
return true;
return false;
}
/// Compute a context C such that C is a parent context of A and B.
/// If no such context exists, return \c nullptr.
static DeclContext *getCommonParentContext(DeclContext *A, DeclContext *B);
/// Returns the module context that contains this context.
ModuleDecl *getParentModule() const;
/// Returns the module scope context that contains this context.
///
/// This is either a \c Module or a \c FileUnit.
DeclContext *getModuleScopeContext() const;
/// Returns the source file that contains this context, or null if this
/// is not within a source file.
SourceFile *getParentSourceFile() const;
/// Determine whether this declaration context is generic, meaning that it or
/// any of its parents have generic parameters.
bool isGenericContext() const;
/// Determine whether the innermost context is generic.
bool isInnermostContextGeneric() const;
/// Get the most optimal resilience expansion for code in this context.
/// If the body is able to be inlined into functions in other resilience
/// domains, this ensures that only sufficiently-conservative access patterns
/// are used.
ResilienceExpansion getResilienceExpansion() const;
/// Returns true if lookups within this context could affect downstream files.
///
/// \param functionsAreNonCascading If true, functions are considered non-
/// cascading contexts. If false, functions are considered non-cascading only
/// if implicitly or explicitly marked private. When concerned only with a
/// function's body, pass true.
bool isCascadingContextForLookup(bool functionsAreNonCascading) const;
/// Look for the set of declarations with the given name within a type,
/// its extensions and, optionally, its supertypes.
///
/// This routine performs name lookup within a given type, its extensions
/// and, optionally, its supertypes and their extensions, from the perspective
/// of the current DeclContext. It can eliminate non-visible, hidden, and
/// overridden declarations from the result set. It does not, however, perform
/// any filtering based on the semantic usefulness of the results.
///
/// \param type The type to look into.
///
/// \param member The member to search for.
///
/// \param options Options that control name lookup, based on the
/// \c NL_* constants in \c NameLookupOptions.
///
/// \param typeResolver Used to resolve types, usually for overload purposes.
/// May be null.
///
/// \param[out] decls Will be populated with the declarations found by name
/// lookup.
///
/// \returns true if anything was found.
bool lookupQualified(Type type, DeclName member, NLOptions options,
LazyResolver *typeResolver,
SmallVectorImpl<ValueDecl *> &decls) const;
/// Look up all Objective-C methods with the given selector visible
/// in the enclosing module.
void lookupAllObjCMethods(
ObjCSelector selector,
SmallVectorImpl<AbstractFunctionDecl *> &results) const;
/// Return the ASTContext for a specified DeclContext by
/// walking up to the enclosing module and returning its ASTContext.
ASTContext &getASTContext() const;
/// Retrieve the set of protocols whose conformances will be
/// associated with this declaration context.
///
/// This function differs from \c getLocalConformances() in that it
/// returns protocol declarations, not protocol conformances, and
/// therefore does not require the protocol conformances to be
/// formed.
///
/// \param lookupKind The kind of lookup to perform.
///
/// \param diagnostics If non-null, will be populated with the set of
/// diagnostics that should be emitted for this declaration context.
///
/// \param sorted Whether to sort the results in a canonical order.
///
/// FIXME: This likely makes more sense on IterableDeclContext or
/// something similar.
SmallVector<ProtocolDecl *, 2>
getLocalProtocols(ConformanceLookupKind lookupKind
= ConformanceLookupKind::All,
SmallVectorImpl<ConformanceDiagnostic> *diagnostics
= nullptr,
bool sorted = false) const;
/// Retrieve the set of protocol conformances associated with this
/// declaration context.
///
/// \param lookupKind The kind of lookup to perform.
///
/// \param diagnostics If non-null, will be populated with the set of
/// diagnostics that should be emitted for this declaration context.
///
/// \param sorted Whether to sort the results in a canonical order.
///
/// FIXME: This likely makes more sense on IterableDeclContext or
/// something similar.
SmallVector<ProtocolConformance *, 2>
getLocalConformances(ConformanceLookupKind lookupKind
= ConformanceLookupKind::All,
SmallVectorImpl<ConformanceDiagnostic> *diagnostics
= nullptr,
bool sorted = false) const;
/// Retrieve the syntactic depth of this declaration context, i.e.,
/// the number of non-module-scoped contexts.
///
/// For an extension of a nested type, the extension is depth 1.
unsigned getSyntacticDepth() const;
/// Retrieve the semantic depth of this declaration context, i.e.,
/// the number of non-module-scoped contexts.
///
/// For an extension of a nested type, the depth of the nested type itself
/// is also included.
unsigned getSemanticDepth() const;
/// \returns true if traversal was aborted, false otherwise.
bool walkContext(ASTWalker &Walker);
void dumpContext() const;
unsigned printContext(llvm::raw_ostream &OS, unsigned indent = 0) const;
// Only allow allocation of DeclContext using the allocator in ASTContext.
void *operator new(size_t Bytes, ASTContext &C,
unsigned Alignment = alignof(DeclContext));
// Some Decls are DeclContexts, but not all. See swift/AST/Decl.h
static bool classof(const Decl *D);
};
/// SerializedLocalDeclContext - the base class for DeclContexts that were
/// serialized to preserve AST structure and accurate mangling after
/// deserialization.
class SerializedLocalDeclContext : public DeclContext {
private:
unsigned LocalKind : 3;
protected:
unsigned SpareBits : 29;
public:
SerializedLocalDeclContext(LocalDeclContextKind LocalKind,
DeclContext *Parent)
: DeclContext(DeclContextKind::SerializedLocal, Parent),
LocalKind(static_cast<unsigned>(LocalKind)) {}
LocalDeclContextKind getLocalDeclContextKind() const {
return static_cast<LocalDeclContextKind>(LocalKind);
}
static bool classof(const DeclContext *DC) {
return DC->getContextKind() == DeclContextKind::SerializedLocal;
}
};
/// An iterator that walks through a list of declarations stored
/// within some iterable declaration context.
class DeclIterator {
Decl *Current;
public:
typedef std::forward_iterator_tag iterator_category;
typedef Decl *value_type;
typedef Decl *reference;
typedef Decl *pointer; // Non-standard but convenient
typedef std::ptrdiff_t difference_type;
DeclIterator(Decl *current = nullptr) : Current(current) { }
reference operator*() const { return Current; }
pointer operator->() const { return Current; }
DeclIterator &operator++();
DeclIterator operator++(int) {
DeclIterator old = *this;
++*this;
return old;
}
friend bool operator==(DeclIterator lhs, DeclIterator rhs) {
return lhs.Current == rhs.Current;
}
friend bool operator!=(DeclIterator lhs, DeclIterator rhs) {
return !(lhs == rhs);
}
};
/// The range of declarations stored within an iterable declaration
/// context.
typedef IteratorRange<DeclIterator> DeclRange;
/// The kind of an \c IterableDeclContext.
enum class IterableDeclContextKind : uint8_t {
NominalTypeDecl = 0,
ExtensionDecl,
};
/// A declaration context that tracks the declarations it (directly)
/// owns and permits iteration over them.
///
/// Note that an iterable declaration context must inherit from both
/// \c IterableDeclContext and \c DeclContext.
class IterableDeclContext {
enum LazyMembers : unsigned {
Present = 1 << 0,
/// Lazy member loading has a variety of feedback loops that need to
/// switch to pseudo-empty-member behaviour to avoid infinite recursion;
/// we use this flag to control them.
InProgress = 1 << 1,
};
/// The first declaration in this context along with a bit indicating whether
/// the members of this context will be lazily produced.
mutable llvm::PointerIntPair<Decl *, 2, LazyMembers> FirstDeclAndLazyMembers;
/// The last declaration in this context, used for efficient insertion,
/// along with the kind of iterable declaration context.
mutable llvm::PointerIntPair<Decl *, 1, IterableDeclContextKind>
LastDeclAndKind;
/// The DeclID this IDC was deserialized from, if any. Used for named lazy
/// member loading, as a key when doing lookup in this IDC.
serialization::DeclID SerialID;
template<class A, class B, class C>
friend struct ::llvm::cast_convert_val;
static IterableDeclContext *castDeclToIterableDeclContext(const Decl *D);
/// Retrieve the \c ASTContext in which this iterable context occurs.
ASTContext &getASTContext() const;
public:
IterableDeclContext(IterableDeclContextKind kind)
: LastDeclAndKind(nullptr, kind) { }
/// Determine the kind of iterable context we have.
IterableDeclContextKind getIterableContextKind() const {
return LastDeclAndKind.getInt();
}
/// Retrieve the set of members in this context.
DeclRange getMembers() const;
/// Retrieve the set of members in this context without loading any from the
/// associated lazy loader; this should only be used as part of implementing
/// abstractions on top of member loading, such as a name lookup table.
DeclRange getCurrentMembersWithoutLoading() const;
/// Add a member to this context. If the hint decl is specified, the new decl
/// is inserted immediately after the hint.
void addMember(Decl *member, Decl *hint = nullptr);
/// Check whether there are lazily-loaded members.
bool hasLazyMembers() const {
return FirstDeclAndLazyMembers.getInt() & LazyMembers::Present;
}
bool isLoadingLazyMembers() {
return FirstDeclAndLazyMembers.getInt() & LazyMembers::InProgress;
}
void setLoadingLazyMembers(bool inProgress) {
LazyMembers status = FirstDeclAndLazyMembers.getInt();
if (inProgress)
status = LazyMembers(status | LazyMembers::InProgress);
else
status = LazyMembers(status & ~LazyMembers::InProgress);
FirstDeclAndLazyMembers.setInt(status);
}
/// Setup the loader for lazily-loaded members.
void setMemberLoader(LazyMemberLoader *loader, uint64_t contextData);
/// Load all of the members of this context.
void loadAllMembers() const;
/// Determine whether this was deserialized (and thus SerialID is
/// valid).
bool wasDeserialized() const;
/// Return 'this' as a \c Decl.
const Decl *getDecl() const;
/// Get the DeclID this Decl was deserialized from.
serialization::DeclID getDeclID() const {
assert(wasDeserialized());
return SerialID;
}
/// Set the DeclID this Decl was deserialized from.
void setDeclID(serialization::DeclID d) {
assert(wasDeserialized());
SerialID = d;
}
// Some Decls are IterableDeclContexts, but not all.
static bool classof(const Decl *D);
private:
/// Add a member to the list for iteration purposes, but do not notify the
/// subclass that we have done so.
///
/// This is used internally when loading members, because loading a
/// member is an invisible addition.
void addMemberSilently(Decl *member, Decl *hint = nullptr) const;
};
} // end namespace swift
namespace llvm {
template<class FromTy>
struct cast_convert_val< ::swift::DeclContext, FromTy, FromTy> {
static ::swift::DeclContext *doit(const FromTy &Val) {
return ::swift::DeclContext::castDeclToDeclContext(Val);
}
};
template<class FromTy>
struct cast_convert_val< ::swift::IterableDeclContext, FromTy, FromTy> {
static ::swift::IterableDeclContext *doit(const FromTy &Val) {
return ::swift::IterableDeclContext::castDeclToIterableDeclContext(Val);
}
};
}
#endif