// construction of AST nodes from some external source.
//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_CLANG_AST_EXTERNAL_AST_SOURCE_H
-#define LLVM_CLANG_AST_EXTERNAL_AST_SOURCE_H
+#ifndef LLVM_CLANG_AST_EXTERNALASTSOURCE_H
+#define LLVM_CLANG_AST_EXTERNALASTSOURCE_H
#include "clang/AST/CharUnits.h"
#include "clang/AST/DeclBase.h"
/// no additional processing is required.
ELR_AlreadyLoaded
};
-
+
/// \brief Abstract interface for external sources of AST nodes.
///
/// External AST sources provide AST nodes constructed from some
/// actual type and declaration nodes, and read parts of declaration
/// contexts.
class ExternalASTSource : public RefCountedBase<ExternalASTSource> {
+ /// Generation number for this external AST source. Must be increased
+ /// whenever we might have added new redeclarations for existing decls.
+ uint32_t CurrentGeneration;
+
/// \brief Whether this AST source also provides information for
/// semantic analysis.
bool SemaSource;
friend class ExternalSemaSource;
public:
- ExternalASTSource() : SemaSource(false) { }
+ ExternalASTSource() : CurrentGeneration(0), SemaSource(false) { }
virtual ~ExternalASTSource();
}
};
+ /// \brief Get the current generation of this AST source. This number
+ /// is incremented each time the AST source lazily extends an existing
+ /// entity.
+ uint32_t getGeneration() const { return CurrentGeneration; }
+
/// \brief Resolve a declaration ID into a declaration, potentially
/// building a new declaration.
///
virtual void completeVisibleDeclsMap(const DeclContext *DC);
/// \brief Retrieve the module that corresponds to the given module ID.
- virtual Module *getModule(unsigned ID) { return 0; }
+ virtual Module *getModule(unsigned ID) { return nullptr; }
/// \brief Finds all declarations lexically contained within the given
/// DeclContext, after applying an optional filter predicate.
/// \return true if an error occurred
ExternalLoadResult FindExternalLexicalDecls(const DeclContext *DC,
SmallVectorImpl<Decl*> &Result) {
- return FindExternalLexicalDecls(DC, 0, Result);
+ return FindExternalLexicalDecls(DC, nullptr, Result);
}
template <typename DeclTy>
/// \brief Get the decls that are contained in a file in the Offset/Length
/// range. \p Length can be 0 to indicate a point at \p Offset instead of
- /// a range.
- virtual void FindFileRegionDecls(FileID File, unsigned Offset,unsigned Length,
- SmallVectorImpl<Decl *> &Decls) {}
+ /// a range.
+ virtual void FindFileRegionDecls(FileID File, unsigned Offset,
+ unsigned Length,
+ SmallVectorImpl<Decl *> &Decls);
+
+ /// \brief Gives the external AST source an opportunity to complete
+ /// the redeclaration chain for a declaration. Called each time we
+ /// need the most recent declaration of a declaration after the
+ /// generation count is incremented.
+ virtual void CompleteRedeclChain(const Decl *D);
/// \brief Gives the external AST source an opportunity to complete
/// an incomplete type.
- virtual void CompleteType(TagDecl *Tag) {}
+ virtual void CompleteType(TagDecl *Tag);
/// \brief Gives the external AST source an opportunity to complete an
/// incomplete Objective-C class.
///
/// This routine will only be invoked if the "externally completed" bit is
- /// set on the ObjCInterfaceDecl via the function
+ /// set on the ObjCInterfaceDecl via the function
/// \c ObjCInterfaceDecl::setExternallyCompleted().
- virtual void CompleteType(ObjCInterfaceDecl *Class) { }
+ virtual void CompleteType(ObjCInterfaceDecl *Class);
/// \brief Loads comment ranges.
- virtual void ReadComments() { }
+ virtual void ReadComments();
/// \brief Notify ExternalASTSource that we started deserialization of
/// a decl or type so until FinishedDeserializing is called there may be
/// decls that are initializing. Must be paired with FinishedDeserializing.
///
/// The default implementation of this method is a no-op.
- virtual void StartedDeserializing() { }
+ virtual void StartedDeserializing();
/// \brief Notify ExternalASTSource that we finished the deserialization of
/// a decl or type. Must be paired with StartedDeserializing.
///
/// The default implementation of this method is a no-op.
- virtual void FinishedDeserializing() { }
+ virtual void FinishedDeserializing();
/// \brief Function that will be invoked when we begin parsing a new
/// translation unit involving this external AST source.
///
/// The default implementation of this method is a no-op.
- virtual void StartTranslationUnit(ASTConsumer *Consumer) { }
+ virtual void StartTranslationUnit(ASTConsumer *Consumer);
/// \brief Print any statistics that have been gathered regarding
/// the external AST source.
/// out according to the ABI.
///
/// \returns true if the record layout was provided, false otherwise.
- virtual bool
- layoutRecordType(const RecordDecl *Record,
- uint64_t &Size, uint64_t &Alignment,
- llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
- llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
- llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets)
- {
- return false;
- }
-
+ virtual bool layoutRecordType(
+ const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
+ llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
+ llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
+ llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets);
+
//===--------------------------------------------------------------------===//
// Queries for performance analysis.
//===--------------------------------------------------------------------===//
static DeclContextLookupResult
SetNoExternalVisibleDeclsForName(const DeclContext *DC,
DeclarationName Name);
+
+ /// \brief Increment the current generation.
+ uint32_t incrementGeneration(ASTContext &C);
};
/// \brief A lazy pointer to an AST node (of base type T) that resides
}
};
+/// \brief A lazy value (of type T) that is within an AST node of type Owner,
+/// where the value might change in later generations of the external AST
+/// source.
+template<typename Owner, typename T, void (ExternalASTSource::*Update)(Owner)>
+struct LazyGenerationalUpdatePtr {
+ /// A cache of the value of this pointer, in the most recent generation in
+ /// which we queried it.
+ struct LazyData {
+ LazyData(ExternalASTSource *Source, T Value)
+ : ExternalSource(Source), LastGeneration(0), LastValue(Value) {}
+ ExternalASTSource *ExternalSource;
+ uint32_t LastGeneration;
+ T LastValue;
+ };
+
+ // Our value is represented as simply T if there is no external AST source.
+ typedef llvm::PointerUnion<T, LazyData*> ValueType;
+ ValueType Value;
+
+ LazyGenerationalUpdatePtr(ValueType V) : Value(V) {}
+
+ // Defined in ASTContext.h
+ static ValueType makeValue(const ASTContext &Ctx, T Value);
+
+public:
+ explicit LazyGenerationalUpdatePtr(const ASTContext &Ctx, T Value = T())
+ : Value(makeValue(Ctx, Value)) {}
+
+ /// Create a pointer that is not potentially updated by later generations of
+ /// the external AST source.
+ enum NotUpdatedTag { NotUpdated };
+ LazyGenerationalUpdatePtr(NotUpdatedTag, T Value = T())
+ : Value(Value) {}
+
+ /// Forcibly set this pointer (which must be lazy) as needing updates.
+ void markIncomplete() {
+ Value.template get<LazyData *>()->LastGeneration = 0;
+ }
+
+ /// Set the value of this pointer, in the current generation.
+ void set(T NewValue) {
+ if (LazyData *LazyVal = Value.template dyn_cast<LazyData*>()) {
+ LazyVal->LastValue = NewValue;
+ return;
+ }
+ Value = NewValue;
+ }
+
+ /// Set the value of this pointer, for this and all future generations.
+ void setNotUpdated(T NewValue) { Value = NewValue; }
+
+ /// Get the value of this pointer, updating its owner if necessary.
+ T get(Owner O) {
+ if (LazyData *LazyVal = Value.template dyn_cast<LazyData*>()) {
+ if (LazyVal->LastGeneration != LazyVal->ExternalSource->getGeneration()) {
+ LazyVal->LastGeneration = LazyVal->ExternalSource->getGeneration();
+ (LazyVal->ExternalSource->*Update)(O);
+ }
+ return LazyVal->LastValue;
+ }
+ return Value.template get<T>();
+ }
+
+ /// Get the most recently computed value of this pointer without updating it.
+ T getNotUpdated() const {
+ if (LazyData *LazyVal = Value.template dyn_cast<LazyData*>())
+ return LazyVal->LastValue;
+ return Value.template get<T>();
+ }
+
+ void *getOpaqueValue() { return Value.getOpaqueValue(); }
+ static LazyGenerationalUpdatePtr getFromOpaqueValue(void *Ptr) {
+ return LazyGenerationalUpdatePtr(ValueType::getFromOpaqueValue(Ptr));
+ }
+};
+} // end namespace clang
+
+/// Specialize PointerLikeTypeTraits to allow LazyGenerationalUpdatePtr to be
+/// placed into a PointerUnion.
+namespace llvm {
+template<typename Owner, typename T,
+ void (clang::ExternalASTSource::*Update)(Owner)>
+struct PointerLikeTypeTraits<
+ clang::LazyGenerationalUpdatePtr<Owner, T, Update>> {
+ typedef clang::LazyGenerationalUpdatePtr<Owner, T, Update> Ptr;
+ static void *getAsVoidPointer(Ptr P) { return P.getOpaqueValue(); }
+ static Ptr getFromVoidPointer(void *P) { return Ptr::getFromOpaqueValue(P); }
+ enum {
+ NumLowBitsAvailable = PointerLikeTypeTraits<T>::NumLowBitsAvailable - 1
+ };
+};
+}
+
+namespace clang {
/// \brief Represents a lazily-loaded vector of data.
///
/// The lazily-loaded vector of data contains data that is partially loaded
if (From.Position < 0) {
Loaded.erase(Loaded.end() + From.Position, Loaded.end());
- From = begin(0, true);
+ From = begin(nullptr, true);
}
Local.erase(Local.begin() + From.Position, Local.begin() + To.Position);
} // end namespace clang
-#endif // LLVM_CLANG_AST_EXTERNAL_AST_SOURCE_H
+#endif
projects / clang / blobdiff