| //===--- PCHWriterDecl.cpp - Declaration Serialization --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements serialization for Declarations. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Frontend/PCHWriter.h" |
| #include "clang/AST/DeclVisitor.h" |
| #include "clang/AST/Expr.h" |
| #include "llvm/ADT/Twine.h" |
| #include "llvm/Bitcode/BitstreamWriter.h" |
| #include "llvm/Support/ErrorHandling.h" |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // Declaration serialization |
| //===----------------------------------------------------------------------===// |
| |
| namespace { |
| class PCHDeclWriter : public DeclVisitor<PCHDeclWriter, void> { |
| |
| PCHWriter &Writer; |
| ASTContext &Context; |
| PCHWriter::RecordData &Record; |
| |
| public: |
| pch::DeclCode Code; |
| unsigned AbbrevToUse; |
| |
| PCHDeclWriter(PCHWriter &Writer, ASTContext &Context, |
| PCHWriter::RecordData &Record) |
| : Writer(Writer), Context(Context), Record(Record) { |
| } |
| |
| void VisitDecl(Decl *D); |
| void VisitTranslationUnitDecl(TranslationUnitDecl *D); |
| void VisitNamedDecl(NamedDecl *D); |
| void VisitTypeDecl(TypeDecl *D); |
| void VisitTypedefDecl(TypedefDecl *D); |
| void VisitTagDecl(TagDecl *D); |
| void VisitEnumDecl(EnumDecl *D); |
| void VisitRecordDecl(RecordDecl *D); |
| void VisitValueDecl(ValueDecl *D); |
| void VisitEnumConstantDecl(EnumConstantDecl *D); |
| void VisitDeclaratorDecl(DeclaratorDecl *D); |
| void VisitFunctionDecl(FunctionDecl *D); |
| void VisitFieldDecl(FieldDecl *D); |
| void VisitVarDecl(VarDecl *D); |
| void VisitImplicitParamDecl(ImplicitParamDecl *D); |
| void VisitParmVarDecl(ParmVarDecl *D); |
| void VisitFileScopeAsmDecl(FileScopeAsmDecl *D); |
| void VisitBlockDecl(BlockDecl *D); |
| void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset, |
| uint64_t VisibleOffset); |
| void VisitObjCMethodDecl(ObjCMethodDecl *D); |
| void VisitObjCContainerDecl(ObjCContainerDecl *D); |
| void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D); |
| void VisitObjCIvarDecl(ObjCIvarDecl *D); |
| void VisitObjCProtocolDecl(ObjCProtocolDecl *D); |
| void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D); |
| void VisitObjCClassDecl(ObjCClassDecl *D); |
| void VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D); |
| void VisitObjCCategoryDecl(ObjCCategoryDecl *D); |
| void VisitObjCImplDecl(ObjCImplDecl *D); |
| void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D); |
| void VisitObjCImplementationDecl(ObjCImplementationDecl *D); |
| void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D); |
| void VisitObjCPropertyDecl(ObjCPropertyDecl *D); |
| void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D); |
| }; |
| } |
| |
| void PCHDeclWriter::VisitDecl(Decl *D) { |
| Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record); |
| Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record); |
| Writer.AddSourceLocation(D->getLocation(), Record); |
| Record.push_back(D->isInvalidDecl()); |
| Record.push_back(D->hasAttrs()); |
| Record.push_back(D->isImplicit()); |
| Record.push_back(D->isUsed()); |
| Record.push_back(D->getAccess()); |
| Record.push_back(D->getPCHLevel()); |
| } |
| |
| void PCHDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) { |
| VisitDecl(D); |
| Code = pch::DECL_TRANSLATION_UNIT; |
| } |
| |
| void PCHDeclWriter::VisitNamedDecl(NamedDecl *D) { |
| VisitDecl(D); |
| Writer.AddDeclarationName(D->getDeclName(), Record); |
| } |
| |
| void PCHDeclWriter::VisitTypeDecl(TypeDecl *D) { |
| VisitNamedDecl(D); |
| Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record); |
| } |
| |
| void PCHDeclWriter::VisitTypedefDecl(TypedefDecl *D) { |
| VisitTypeDecl(D); |
| Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record); |
| Code = pch::DECL_TYPEDEF; |
| } |
| |
| void PCHDeclWriter::VisitTagDecl(TagDecl *D) { |
| VisitTypeDecl(D); |
| Writer.AddDeclRef(D->getPreviousDeclaration(), Record); |
| Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding |
| Record.push_back(D->isDefinition()); |
| Writer.AddDeclRef(D->getTypedefForAnonDecl(), Record); |
| Writer.AddSourceLocation(D->getRBraceLoc(), Record); |
| Writer.AddSourceLocation(D->getTagKeywordLoc(), Record); |
| } |
| |
| void PCHDeclWriter::VisitEnumDecl(EnumDecl *D) { |
| VisitTagDecl(D); |
| Writer.AddTypeRef(D->getIntegerType(), Record); |
| Writer.AddTypeRef(D->getPromotionType(), Record); |
| // FIXME: C++ InstantiatedFrom |
| Code = pch::DECL_ENUM; |
| } |
| |
| void PCHDeclWriter::VisitRecordDecl(RecordDecl *D) { |
| VisitTagDecl(D); |
| Record.push_back(D->hasFlexibleArrayMember()); |
| Record.push_back(D->isAnonymousStructOrUnion()); |
| Record.push_back(D->hasObjectMember()); |
| Code = pch::DECL_RECORD; |
| } |
| |
| void PCHDeclWriter::VisitValueDecl(ValueDecl *D) { |
| VisitNamedDecl(D); |
| Writer.AddTypeRef(D->getType(), Record); |
| } |
| |
| void PCHDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) { |
| VisitValueDecl(D); |
| Record.push_back(D->getInitExpr()? 1 : 0); |
| if (D->getInitExpr()) |
| Writer.AddStmt(D->getInitExpr()); |
| Writer.AddAPSInt(D->getInitVal(), Record); |
| Code = pch::DECL_ENUM_CONSTANT; |
| } |
| |
| void PCHDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) { |
| VisitValueDecl(D); |
| Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record); |
| } |
| |
| void PCHDeclWriter::VisitFunctionDecl(FunctionDecl *D) { |
| VisitDeclaratorDecl(D); |
| Record.push_back(D->isThisDeclarationADefinition()); |
| if (D->isThisDeclarationADefinition()) |
| Writer.AddStmt(D->getBody()); |
| Writer.AddDeclRef(D->getPreviousDeclaration(), Record); |
| Record.push_back(D->getStorageClass()); // FIXME: stable encoding |
| Record.push_back(D->isInlineSpecified()); |
| Record.push_back(D->isVirtualAsWritten()); |
| Record.push_back(D->isPure()); |
| Record.push_back(D->hasInheritedPrototype()); |
| Record.push_back(D->hasWrittenPrototype()); |
| Record.push_back(D->isDeleted()); |
| Record.push_back(D->isTrivial()); |
| Record.push_back(D->isCopyAssignment()); |
| Record.push_back(D->hasImplicitReturnZero()); |
| Writer.AddSourceLocation(D->getLocEnd(), Record); |
| // FIXME: C++ TemplateOrInstantiation |
| Record.push_back(D->param_size()); |
| for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end(); |
| P != PEnd; ++P) |
| Writer.AddDeclRef(*P, Record); |
| Code = pch::DECL_FUNCTION; |
| } |
| |
| void PCHDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) { |
| VisitNamedDecl(D); |
| // FIXME: convert to LazyStmtPtr? |
| // Unlike C/C++, method bodies will never be in header files. |
| Record.push_back(D->getBody() != 0); |
| if (D->getBody() != 0) { |
| Writer.AddStmt(D->getBody()); |
| Writer.AddDeclRef(D->getSelfDecl(), Record); |
| Writer.AddDeclRef(D->getCmdDecl(), Record); |
| } |
| Record.push_back(D->isInstanceMethod()); |
| Record.push_back(D->isVariadic()); |
| Record.push_back(D->isSynthesized()); |
| // FIXME: stable encoding for @required/@optional |
| Record.push_back(D->getImplementationControl()); |
| // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway |
| Record.push_back(D->getObjCDeclQualifier()); |
| Writer.AddTypeRef(D->getResultType(), Record); |
| Writer.AddSourceLocation(D->getLocEnd(), Record); |
| Record.push_back(D->param_size()); |
| for (ObjCMethodDecl::param_iterator P = D->param_begin(), |
| PEnd = D->param_end(); P != PEnd; ++P) |
| Writer.AddDeclRef(*P, Record); |
| Code = pch::DECL_OBJC_METHOD; |
| } |
| |
| void PCHDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) { |
| VisitNamedDecl(D); |
| SourceRange R = D->getAtEndRange(); |
| Writer.AddSourceLocation(R.getBegin(), Record); |
| Writer.AddSourceLocation(R.getEnd(), Record); |
| // Abstract class (no need to define a stable pch::DECL code). |
| } |
| |
| void PCHDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) { |
| VisitObjCContainerDecl(D); |
| Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record); |
| Writer.AddDeclRef(D->getSuperClass(), Record); |
| Record.push_back(D->protocol_size()); |
| for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(), |
| PEnd = D->protocol_end(); |
| P != PEnd; ++P) |
| Writer.AddDeclRef(*P, Record); |
| for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(), |
| PLEnd = D->protocol_loc_end(); |
| PL != PLEnd; ++PL) |
| Writer.AddSourceLocation(*PL, Record); |
| Record.push_back(D->ivar_size()); |
| for (ObjCInterfaceDecl::ivar_iterator I = D->ivar_begin(), |
| IEnd = D->ivar_end(); I != IEnd; ++I) |
| Writer.AddDeclRef(*I, Record); |
| Writer.AddDeclRef(D->getCategoryList(), Record); |
| Record.push_back(D->isForwardDecl()); |
| Record.push_back(D->isImplicitInterfaceDecl()); |
| Writer.AddSourceLocation(D->getClassLoc(), Record); |
| Writer.AddSourceLocation(D->getSuperClassLoc(), Record); |
| Writer.AddSourceLocation(D->getLocEnd(), Record); |
| Code = pch::DECL_OBJC_INTERFACE; |
| } |
| |
| void PCHDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) { |
| VisitFieldDecl(D); |
| // FIXME: stable encoding for @public/@private/@protected/@package |
| Record.push_back(D->getAccessControl()); |
| Code = pch::DECL_OBJC_IVAR; |
| } |
| |
| void PCHDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) { |
| VisitObjCContainerDecl(D); |
| Record.push_back(D->isForwardDecl()); |
| Writer.AddSourceLocation(D->getLocEnd(), Record); |
| Record.push_back(D->protocol_size()); |
| for (ObjCProtocolDecl::protocol_iterator |
| I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I) |
| Writer.AddDeclRef(*I, Record); |
| for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(), |
| PLEnd = D->protocol_loc_end(); |
| PL != PLEnd; ++PL) |
| Writer.AddSourceLocation(*PL, Record); |
| Code = pch::DECL_OBJC_PROTOCOL; |
| } |
| |
| void PCHDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) { |
| VisitFieldDecl(D); |
| Code = pch::DECL_OBJC_AT_DEFS_FIELD; |
| } |
| |
| void PCHDeclWriter::VisitObjCClassDecl(ObjCClassDecl *D) { |
| VisitDecl(D); |
| Record.push_back(D->size()); |
| for (ObjCClassDecl::iterator I = D->begin(), IEnd = D->end(); I != IEnd; ++I) |
| Writer.AddDeclRef(I->getInterface(), Record); |
| for (ObjCClassDecl::iterator I = D->begin(), IEnd = D->end(); I != IEnd; ++I) |
| Writer.AddSourceLocation(I->getLocation(), Record); |
| Code = pch::DECL_OBJC_CLASS; |
| } |
| |
| void PCHDeclWriter::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D) { |
| VisitDecl(D); |
| Record.push_back(D->protocol_size()); |
| for (ObjCForwardProtocolDecl::protocol_iterator |
| I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I) |
| Writer.AddDeclRef(*I, Record); |
| for (ObjCForwardProtocolDecl::protocol_loc_iterator |
| PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end(); |
| PL != PLEnd; ++PL) |
| Writer.AddSourceLocation(*PL, Record); |
| Code = pch::DECL_OBJC_FORWARD_PROTOCOL; |
| } |
| |
| void PCHDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) { |
| VisitObjCContainerDecl(D); |
| Writer.AddDeclRef(D->getClassInterface(), Record); |
| Record.push_back(D->protocol_size()); |
| for (ObjCCategoryDecl::protocol_iterator |
| I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I) |
| Writer.AddDeclRef(*I, Record); |
| for (ObjCCategoryDecl::protocol_loc_iterator |
| PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end(); |
| PL != PLEnd; ++PL) |
| Writer.AddSourceLocation(*PL, Record); |
| Writer.AddDeclRef(D->getNextClassCategory(), Record); |
| Writer.AddSourceLocation(D->getAtLoc(), Record); |
| Writer.AddSourceLocation(D->getCategoryNameLoc(), Record); |
| Code = pch::DECL_OBJC_CATEGORY; |
| } |
| |
| void PCHDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) { |
| VisitNamedDecl(D); |
| Writer.AddDeclRef(D->getClassInterface(), Record); |
| Code = pch::DECL_OBJC_COMPATIBLE_ALIAS; |
| } |
| |
| void PCHDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) { |
| VisitNamedDecl(D); |
| Writer.AddTypeRef(D->getType(), Record); |
| // FIXME: stable encoding |
| Record.push_back((unsigned)D->getPropertyAttributes()); |
| // FIXME: stable encoding |
| Record.push_back((unsigned)D->getPropertyImplementation()); |
| Writer.AddDeclarationName(D->getGetterName(), Record); |
| Writer.AddDeclarationName(D->getSetterName(), Record); |
| Writer.AddDeclRef(D->getGetterMethodDecl(), Record); |
| Writer.AddDeclRef(D->getSetterMethodDecl(), Record); |
| Writer.AddDeclRef(D->getPropertyIvarDecl(), Record); |
| Code = pch::DECL_OBJC_PROPERTY; |
| } |
| |
| void PCHDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) { |
| VisitObjCContainerDecl(D); |
| Writer.AddDeclRef(D->getClassInterface(), Record); |
| // Abstract class (no need to define a stable pch::DECL code). |
| } |
| |
| void PCHDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) { |
| VisitObjCImplDecl(D); |
| Writer.AddIdentifierRef(D->getIdentifier(), Record); |
| Code = pch::DECL_OBJC_CATEGORY_IMPL; |
| } |
| |
| void PCHDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) { |
| VisitObjCImplDecl(D); |
| Writer.AddDeclRef(D->getSuperClass(), Record); |
| Code = pch::DECL_OBJC_IMPLEMENTATION; |
| } |
| |
| void PCHDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) { |
| VisitDecl(D); |
| Writer.AddSourceLocation(D->getLocStart(), Record); |
| Writer.AddDeclRef(D->getPropertyDecl(), Record); |
| Writer.AddDeclRef(D->getPropertyIvarDecl(), Record); |
| Code = pch::DECL_OBJC_PROPERTY_IMPL; |
| } |
| |
| void PCHDeclWriter::VisitFieldDecl(FieldDecl *D) { |
| VisitDeclaratorDecl(D); |
| Record.push_back(D->isMutable()); |
| Record.push_back(D->getBitWidth()? 1 : 0); |
| if (D->getBitWidth()) |
| Writer.AddStmt(D->getBitWidth()); |
| Code = pch::DECL_FIELD; |
| } |
| |
| void PCHDeclWriter::VisitVarDecl(VarDecl *D) { |
| VisitDeclaratorDecl(D); |
| Record.push_back(D->getStorageClass()); // FIXME: stable encoding |
| Record.push_back(D->isThreadSpecified()); |
| Record.push_back(D->hasCXXDirectInitializer()); |
| Record.push_back(D->isDeclaredInCondition()); |
| Writer.AddDeclRef(D->getPreviousDeclaration(), Record); |
| Record.push_back(D->getInit()? 1 : 0); |
| if (D->getInit()) |
| Writer.AddStmt(D->getInit()); |
| Code = pch::DECL_VAR; |
| } |
| |
| void PCHDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) { |
| VisitVarDecl(D); |
| Code = pch::DECL_IMPLICIT_PARAM; |
| } |
| |
| void PCHDeclWriter::VisitParmVarDecl(ParmVarDecl *D) { |
| VisitVarDecl(D); |
| Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding |
| Code = pch::DECL_PARM_VAR; |
| |
| |
| // If the assumptions about the DECL_PARM_VAR abbrev are true, use it. Here |
| // we dynamically check for the properties that we optimize for, but don't |
| // know are true of all PARM_VAR_DECLs. |
| if (!D->getTypeSourceInfo() && |
| !D->hasAttrs() && |
| !D->isImplicit() && |
| !D->isUsed() && |
| D->getAccess() == AS_none && |
| D->getPCHLevel() == 0 && |
| D->getStorageClass() == 0 && |
| !D->hasCXXDirectInitializer() && // Can params have this ever? |
| D->getObjCDeclQualifier() == 0) |
| AbbrevToUse = Writer.getParmVarDeclAbbrev(); |
| |
| // Check things we know are true of *every* PARM_VAR_DECL, which is more than |
| // just us assuming it. |
| assert(!D->isInvalidDecl() && "Shouldn't emit invalid decls"); |
| assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread"); |
| assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private"); |
| assert(!D->isDeclaredInCondition() && "PARM_VAR_DECL can't be in condition"); |
| assert(D->getPreviousDeclaration() == 0 && "PARM_VAR_DECL can't be redecl"); |
| assert(D->getInit() == 0 && "PARM_VAR_DECL never has init"); |
| } |
| |
| void PCHDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) { |
| VisitDecl(D); |
| Writer.AddStmt(D->getAsmString()); |
| Code = pch::DECL_FILE_SCOPE_ASM; |
| } |
| |
| void PCHDeclWriter::VisitBlockDecl(BlockDecl *D) { |
| VisitDecl(D); |
| Writer.AddStmt(D->getBody()); |
| Record.push_back(D->param_size()); |
| for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end(); |
| P != PEnd; ++P) |
| Writer.AddDeclRef(*P, Record); |
| Code = pch::DECL_BLOCK; |
| } |
| |
| /// \brief Emit the DeclContext part of a declaration context decl. |
| /// |
| /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL |
| /// block for this declaration context is stored. May be 0 to indicate |
| /// that there are no declarations stored within this context. |
| /// |
| /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE |
| /// block for this declaration context is stored. May be 0 to indicate |
| /// that there are no declarations visible from this context. Note |
| /// that this value will not be emitted for non-primary declaration |
| /// contexts. |
| void PCHDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset, |
| uint64_t VisibleOffset) { |
| Record.push_back(LexicalOffset); |
| Record.push_back(VisibleOffset); |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // PCHWriter Implementation |
| //===----------------------------------------------------------------------===// |
| |
| void PCHWriter::WriteDeclsBlockAbbrevs() { |
| using namespace llvm; |
| // Abbreviation for DECL_PARM_VAR. |
| BitCodeAbbrev *Abv = new BitCodeAbbrev(); |
| Abv->Add(BitCodeAbbrevOp(pch::DECL_PARM_VAR)); |
| |
| // Decl |
| Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext |
| Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext |
| Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location |
| Abv->Add(BitCodeAbbrevOp(0)); // isInvalidDecl (!?) |
| Abv->Add(BitCodeAbbrevOp(0)); // HasAttrs |
| Abv->Add(BitCodeAbbrevOp(0)); // isImplicit |
| Abv->Add(BitCodeAbbrevOp(0)); // isUsed |
| Abv->Add(BitCodeAbbrevOp(AS_none)); // C++ AccessSpecifier |
| Abv->Add(BitCodeAbbrevOp(0)); // PCH level |
| |
| // NamedDecl |
| Abv->Add(BitCodeAbbrevOp(0)); // NameKind = Identifier |
| Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name |
| // ValueDecl |
| Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type |
| // DeclaratorDecl |
| Abv->Add(BitCodeAbbrevOp(pch::PREDEF_TYPE_NULL_ID)); // InfoType |
| // VarDecl |
| Abv->Add(BitCodeAbbrevOp(0)); // StorageClass |
| Abv->Add(BitCodeAbbrevOp(0)); // isThreadSpecified |
| Abv->Add(BitCodeAbbrevOp(0)); // hasCXXDirectInitializer |
| Abv->Add(BitCodeAbbrevOp(0)); // isDeclaredInCondition |
| Abv->Add(BitCodeAbbrevOp(0)); // PrevDecl |
| Abv->Add(BitCodeAbbrevOp(0)); // HasInit |
| // ParmVarDecl |
| Abv->Add(BitCodeAbbrevOp(0)); // ObjCDeclQualifier |
| |
| ParmVarDeclAbbrev = Stream.EmitAbbrev(Abv); |
| } |
| |
| /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by |
| /// consumers of the AST. |
| /// |
| /// Such decls will always be deserialized from the PCH file, so we would like |
| /// this to be as restrictive as possible. Currently the predicate is driven by |
| /// code generation requirements, if other clients have a different notion of |
| /// what is "required" then we may have to consider an alternate scheme where |
| /// clients can iterate over the top-level decls and get information on them, |
| /// without necessary deserializing them. We could explicitly require such |
| /// clients to use a separate API call to "realize" the decl. This should be |
| /// relatively painless since they would presumably only do it for top-level |
| /// decls. |
| // |
| // FIXME: This predicate is essentially IRgen's predicate to determine whether a |
| // declaration can be deferred. Merge them somehow. |
| static bool isRequiredDecl(const Decl *D, ASTContext &Context) { |
| // File scoped assembly must be seen. |
| if (isa<FileScopeAsmDecl>(D)) |
| return true; |
| |
| // Otherwise if this isn't a function or a file scoped variable it doesn't |
| // need to be seen. |
| if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { |
| if (!VD->isFileVarDecl()) |
| return false; |
| } else if (!isa<FunctionDecl>(D)) |
| return false; |
| |
| // Aliases and used decls must be seen. |
| if (D->hasAttr<AliasAttr>() || D->hasAttr<UsedAttr>()) |
| return true; |
| |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| // Forward declarations don't need to be seen. |
| if (!FD->isThisDeclarationADefinition()) |
| return false; |
| |
| // Constructors and destructors must be seen. |
| if (FD->hasAttr<ConstructorAttr>() || FD->hasAttr<DestructorAttr>()) |
| return true; |
| |
| // Otherwise, this is required unless it is static. |
| // |
| // FIXME: Inlines. |
| return FD->getStorageClass() != FunctionDecl::Static; |
| } else { |
| const VarDecl *VD = cast<VarDecl>(D); |
| |
| // In C++, this doesn't need to be seen if it is marked "extern". |
| if (Context.getLangOptions().CPlusPlus && !VD->getInit() && |
| (VD->getStorageClass() == VarDecl::Extern || |
| VD->isExternC())) |
| return false; |
| |
| // In C, this doesn't need to be seen unless it is a definition. |
| if (!Context.getLangOptions().CPlusPlus && !VD->getInit()) |
| return false; |
| |
| // Otherwise, this is required unless it is static. |
| return VD->getStorageClass() != VarDecl::Static; |
| } |
| } |
| |
| void PCHWriter::WriteDecl(ASTContext &Context, Decl *D) { |
| RecordData Record; |
| PCHDeclWriter W(*this, Context, Record); |
| |
| // If this declaration is also a DeclContext, write blocks for the |
| // declarations that lexically stored inside its context and those |
| // declarations that are visible from its context. These blocks |
| // are written before the declaration itself so that we can put |
| // their offsets into the record for the declaration. |
| uint64_t LexicalOffset = 0; |
| uint64_t VisibleOffset = 0; |
| DeclContext *DC = dyn_cast<DeclContext>(D); |
| if (DC) { |
| LexicalOffset = WriteDeclContextLexicalBlock(Context, DC); |
| VisibleOffset = WriteDeclContextVisibleBlock(Context, DC); |
| } |
| |
| // Determine the ID for this declaration |
| pch::DeclID &ID = DeclIDs[D]; |
| if (ID == 0) |
| ID = DeclIDs.size(); |
| |
| unsigned Index = ID - 1; |
| |
| // Record the offset for this declaration |
| if (DeclOffsets.size() == Index) |
| DeclOffsets.push_back(Stream.GetCurrentBitNo()); |
| else if (DeclOffsets.size() < Index) { |
| DeclOffsets.resize(Index+1); |
| DeclOffsets[Index] = Stream.GetCurrentBitNo(); |
| } |
| |
| // Build and emit a record for this declaration |
| Record.clear(); |
| W.Code = (pch::DeclCode)0; |
| W.AbbrevToUse = 0; |
| W.Visit(D); |
| if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset); |
| |
| if (!W.Code) |
| llvm::llvm_report_error(llvm::StringRef("unexpected declaration kind '") + |
| D->getDeclKindName() + "'"); |
| Stream.EmitRecord(W.Code, Record, W.AbbrevToUse); |
| |
| // If the declaration had any attributes, write them now. |
| if (D->hasAttrs()) |
| WriteAttributeRecord(D->getAttrs()); |
| |
| // Flush any expressions that were written as part of this declaration. |
| FlushStmts(); |
| |
| // Note "external" declarations so that we can add them to a record in the |
| // PCH file later. |
| // |
| // FIXME: This should be renamed, the predicate is much more complicated. |
| if (isRequiredDecl(D, Context)) |
| ExternalDefinitions.push_back(Index + 1); |
| } |