| //===--- PCHReader.cpp - Precompiled Headers Reader -------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the PCHReader class, which reads a precompiled header. |
| // |
| //===----------------------------------------------------------------------===// |
| #include "clang/Frontend/PCHReader.h" |
| #include "clang/Frontend/FrontendDiagnostic.h" |
| #include "clang/AST/ASTConsumer.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/AST/DeclGroup.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/StmtVisitor.h" |
| #include "clang/AST/Type.h" |
| #include "clang/Lex/MacroInfo.h" |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "clang/Basic/SourceManagerInternals.h" |
| #include "clang/Basic/FileManager.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "llvm/Bitcode/BitstreamReader.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include <algorithm> |
| #include <cstdio> |
| |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===// |
| // Declaration deserialization |
| //===----------------------------------------------------------------------===// |
| namespace { |
| class VISIBILITY_HIDDEN PCHDeclReader { |
| PCHReader &Reader; |
| const PCHReader::RecordData &Record; |
| unsigned &Idx; |
| |
| public: |
| PCHDeclReader(PCHReader &Reader, const PCHReader::RecordData &Record, |
| unsigned &Idx) |
| : Reader(Reader), Record(Record), Idx(Idx) { } |
| |
| void VisitDecl(Decl *D); |
| void VisitTranslationUnitDecl(TranslationUnitDecl *TU); |
| void VisitNamedDecl(NamedDecl *ND); |
| void VisitTypeDecl(TypeDecl *TD); |
| void VisitTypedefDecl(TypedefDecl *TD); |
| void VisitTagDecl(TagDecl *TD); |
| void VisitEnumDecl(EnumDecl *ED); |
| void VisitRecordDecl(RecordDecl *RD); |
| void VisitValueDecl(ValueDecl *VD); |
| void VisitEnumConstantDecl(EnumConstantDecl *ECD); |
| void VisitFunctionDecl(FunctionDecl *FD); |
| void VisitFieldDecl(FieldDecl *FD); |
| void VisitVarDecl(VarDecl *VD); |
| void VisitParmVarDecl(ParmVarDecl *PD); |
| void VisitOriginalParmVarDecl(OriginalParmVarDecl *PD); |
| void VisitFileScopeAsmDecl(FileScopeAsmDecl *AD); |
| void VisitBlockDecl(BlockDecl *BD); |
| std::pair<uint64_t, uint64_t> VisitDeclContext(DeclContext *DC); |
| }; |
| } |
| |
| void PCHDeclReader::VisitDecl(Decl *D) { |
| D->setDeclContext(cast_or_null<DeclContext>(Reader.GetDecl(Record[Idx++]))); |
| D->setLexicalDeclContext( |
| cast_or_null<DeclContext>(Reader.GetDecl(Record[Idx++]))); |
| D->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| D->setInvalidDecl(Record[Idx++]); |
| // FIXME: hasAttrs |
| D->setImplicit(Record[Idx++]); |
| D->setAccess((AccessSpecifier)Record[Idx++]); |
| } |
| |
| void PCHDeclReader::VisitTranslationUnitDecl(TranslationUnitDecl *TU) { |
| VisitDecl(TU); |
| } |
| |
| void PCHDeclReader::VisitNamedDecl(NamedDecl *ND) { |
| VisitDecl(ND); |
| ND->setDeclName(Reader.ReadDeclarationName(Record, Idx)); |
| } |
| |
| void PCHDeclReader::VisitTypeDecl(TypeDecl *TD) { |
| VisitNamedDecl(TD); |
| TD->setTypeForDecl(Reader.GetType(Record[Idx++]).getTypePtr()); |
| } |
| |
| void PCHDeclReader::VisitTypedefDecl(TypedefDecl *TD) { |
| // Note that we cannot use VisitTypeDecl here, because we need to |
| // set the underlying type of the typedef *before* we try to read |
| // the type associated with the TypedefDecl. |
| VisitNamedDecl(TD); |
| TD->setUnderlyingType(Reader.GetType(Record[Idx + 1])); |
| TD->setTypeForDecl(Reader.GetType(Record[Idx]).getTypePtr()); |
| Idx += 2; |
| } |
| |
| void PCHDeclReader::VisitTagDecl(TagDecl *TD) { |
| VisitTypeDecl(TD); |
| TD->setTagKind((TagDecl::TagKind)Record[Idx++]); |
| TD->setDefinition(Record[Idx++]); |
| TD->setTypedefForAnonDecl( |
| cast_or_null<TypedefDecl>(Reader.GetDecl(Record[Idx++]))); |
| } |
| |
| void PCHDeclReader::VisitEnumDecl(EnumDecl *ED) { |
| VisitTagDecl(ED); |
| ED->setIntegerType(Reader.GetType(Record[Idx++])); |
| } |
| |
| void PCHDeclReader::VisitRecordDecl(RecordDecl *RD) { |
| VisitTagDecl(RD); |
| RD->setHasFlexibleArrayMember(Record[Idx++]); |
| RD->setAnonymousStructOrUnion(Record[Idx++]); |
| } |
| |
| void PCHDeclReader::VisitValueDecl(ValueDecl *VD) { |
| VisitNamedDecl(VD); |
| VD->setType(Reader.GetType(Record[Idx++])); |
| } |
| |
| void PCHDeclReader::VisitEnumConstantDecl(EnumConstantDecl *ECD) { |
| VisitValueDecl(ECD); |
| if (Record[Idx++]) |
| ECD->setInitExpr(Reader.ReadExpr()); |
| ECD->setInitVal(Reader.ReadAPSInt(Record, Idx)); |
| } |
| |
| void PCHDeclReader::VisitFunctionDecl(FunctionDecl *FD) { |
| VisitValueDecl(FD); |
| // FIXME: function body |
| FD->setPreviousDeclaration( |
| cast_or_null<FunctionDecl>(Reader.GetDecl(Record[Idx++]))); |
| FD->setStorageClass((FunctionDecl::StorageClass)Record[Idx++]); |
| FD->setInline(Record[Idx++]); |
| FD->setVirtual(Record[Idx++]); |
| FD->setPure(Record[Idx++]); |
| FD->setInheritedPrototype(Record[Idx++]); |
| FD->setHasPrototype(Record[Idx++]); |
| FD->setDeleted(Record[Idx++]); |
| FD->setTypeSpecStartLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| unsigned NumParams = Record[Idx++]; |
| llvm::SmallVector<ParmVarDecl *, 16> Params; |
| Params.reserve(NumParams); |
| for (unsigned I = 0; I != NumParams; ++I) |
| Params.push_back(cast<ParmVarDecl>(Reader.GetDecl(Record[Idx++]))); |
| FD->setParams(Reader.getContext(), &Params[0], NumParams); |
| } |
| |
| void PCHDeclReader::VisitFieldDecl(FieldDecl *FD) { |
| VisitValueDecl(FD); |
| FD->setMutable(Record[Idx++]); |
| if (Record[Idx++]) |
| FD->setBitWidth(Reader.ReadExpr()); |
| } |
| |
| void PCHDeclReader::VisitVarDecl(VarDecl *VD) { |
| VisitValueDecl(VD); |
| VD->setStorageClass((VarDecl::StorageClass)Record[Idx++]); |
| VD->setThreadSpecified(Record[Idx++]); |
| VD->setCXXDirectInitializer(Record[Idx++]); |
| VD->setDeclaredInCondition(Record[Idx++]); |
| VD->setPreviousDeclaration( |
| cast_or_null<VarDecl>(Reader.GetDecl(Record[Idx++]))); |
| VD->setTypeSpecStartLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| if (Record[Idx++]) |
| VD->setInit(Reader.ReadExpr()); |
| } |
| |
| void PCHDeclReader::VisitParmVarDecl(ParmVarDecl *PD) { |
| VisitVarDecl(PD); |
| PD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record[Idx++]); |
| // FIXME: default argument |
| } |
| |
| void PCHDeclReader::VisitOriginalParmVarDecl(OriginalParmVarDecl *PD) { |
| VisitParmVarDecl(PD); |
| PD->setOriginalType(Reader.GetType(Record[Idx++])); |
| } |
| |
| void PCHDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) { |
| VisitDecl(AD); |
| // FIXME: read asm string |
| } |
| |
| void PCHDeclReader::VisitBlockDecl(BlockDecl *BD) { |
| VisitDecl(BD); |
| unsigned NumParams = Record[Idx++]; |
| llvm::SmallVector<ParmVarDecl *, 16> Params; |
| Params.reserve(NumParams); |
| for (unsigned I = 0; I != NumParams; ++I) |
| Params.push_back(cast<ParmVarDecl>(Reader.GetDecl(Record[Idx++]))); |
| BD->setParams(Reader.getContext(), &Params[0], NumParams); |
| } |
| |
| std::pair<uint64_t, uint64_t> |
| PCHDeclReader::VisitDeclContext(DeclContext *DC) { |
| uint64_t LexicalOffset = Record[Idx++]; |
| uint64_t VisibleOffset = 0; |
| if (DC->getPrimaryContext() == DC) |
| VisibleOffset = Record[Idx++]; |
| return std::make_pair(LexicalOffset, VisibleOffset); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Statement/expression deserialization |
| //===----------------------------------------------------------------------===// |
| namespace { |
| class VISIBILITY_HIDDEN PCHStmtReader |
| : public StmtVisitor<PCHStmtReader, unsigned> { |
| PCHReader &Reader; |
| const PCHReader::RecordData &Record; |
| unsigned &Idx; |
| llvm::SmallVectorImpl<Expr *> &ExprStack; |
| |
| public: |
| PCHStmtReader(PCHReader &Reader, const PCHReader::RecordData &Record, |
| unsigned &Idx, llvm::SmallVectorImpl<Expr *> &ExprStack) |
| : Reader(Reader), Record(Record), Idx(Idx), ExprStack(ExprStack) { } |
| |
| // Each of the Visit* functions reads in part of the expression |
| // from the given record and the current expression stack, then |
| // return the total number of operands that it read from the |
| // expression stack. |
| |
| unsigned VisitExpr(Expr *E); |
| unsigned VisitPredefinedExpr(PredefinedExpr *E); |
| unsigned VisitDeclRefExpr(DeclRefExpr *E); |
| unsigned VisitIntegerLiteral(IntegerLiteral *E); |
| unsigned VisitFloatingLiteral(FloatingLiteral *E); |
| unsigned VisitCharacterLiteral(CharacterLiteral *E); |
| unsigned VisitParenExpr(ParenExpr *E); |
| unsigned VisitUnaryOperator(UnaryOperator *E); |
| unsigned VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E); |
| unsigned VisitCastExpr(CastExpr *E); |
| unsigned VisitBinaryOperator(BinaryOperator *E); |
| unsigned VisitImplicitCastExpr(ImplicitCastExpr *E); |
| unsigned VisitExplicitCastExpr(ExplicitCastExpr *E); |
| unsigned VisitCStyleCastExpr(CStyleCastExpr *E); |
| }; |
| } |
| |
| unsigned PCHStmtReader::VisitExpr(Expr *E) { |
| E->setType(Reader.GetType(Record[Idx++])); |
| E->setTypeDependent(Record[Idx++]); |
| E->setValueDependent(Record[Idx++]); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitPredefinedExpr(PredefinedExpr *E) { |
| VisitExpr(E); |
| E->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setIdentType((PredefinedExpr::IdentType)Record[Idx++]); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitDeclRefExpr(DeclRefExpr *E) { |
| VisitExpr(E); |
| E->setDecl(cast<NamedDecl>(Reader.GetDecl(Record[Idx++]))); |
| E->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitIntegerLiteral(IntegerLiteral *E) { |
| VisitExpr(E); |
| E->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setValue(Reader.ReadAPInt(Record, Idx)); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitFloatingLiteral(FloatingLiteral *E) { |
| VisitExpr(E); |
| E->setValue(Reader.ReadAPFloat(Record, Idx)); |
| E->setExact(Record[Idx++]); |
| E->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitCharacterLiteral(CharacterLiteral *E) { |
| VisitExpr(E); |
| E->setValue(Record[Idx++]); |
| E->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setWide(Record[Idx++]); |
| return 0; |
| } |
| |
| unsigned PCHStmtReader::VisitParenExpr(ParenExpr *E) { |
| VisitExpr(E); |
| E->setLParen(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setRParen(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setSubExpr(ExprStack.back()); |
| return 1; |
| } |
| |
| unsigned PCHStmtReader::VisitUnaryOperator(UnaryOperator *E) { |
| VisitExpr(E); |
| E->setSubExpr(ExprStack.back()); |
| E->setOpcode((UnaryOperator::Opcode)Record[Idx++]); |
| E->setOperatorLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return 1; |
| } |
| |
| unsigned PCHStmtReader::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E) { |
| VisitExpr(E); |
| E->setSizeof(Record[Idx++]); |
| if (Record[Idx] == 0) { |
| E->setArgument(ExprStack.back()); |
| ++Idx; |
| } else { |
| E->setArgument(Reader.GetType(Record[Idx++])); |
| } |
| E->setOperatorLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setRParenLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return E->isArgumentType()? 0 : 1; |
| } |
| |
| unsigned PCHStmtReader::VisitCastExpr(CastExpr *E) { |
| VisitExpr(E); |
| E->setSubExpr(ExprStack.back()); |
| return 1; |
| } |
| |
| unsigned PCHStmtReader::VisitBinaryOperator(BinaryOperator *E) { |
| VisitExpr(E); |
| E->setLHS(ExprStack.end()[-2]); |
| E->setRHS(ExprStack.end()[-1]); |
| E->setOpcode((BinaryOperator::Opcode)Record[Idx++]); |
| E->setOperatorLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return 2; |
| } |
| |
| unsigned PCHStmtReader::VisitImplicitCastExpr(ImplicitCastExpr *E) { |
| VisitCastExpr(E); |
| E->setLvalueCast(Record[Idx++]); |
| return 1; |
| } |
| |
| unsigned PCHStmtReader::VisitExplicitCastExpr(ExplicitCastExpr *E) { |
| VisitCastExpr(E); |
| E->setTypeAsWritten(Reader.GetType(Record[Idx++])); |
| return 1; |
| } |
| |
| unsigned PCHStmtReader::VisitCStyleCastExpr(CStyleCastExpr *E) { |
| VisitExplicitCastExpr(E); |
| E->setLParenLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| E->setRParenLoc(SourceLocation::getFromRawEncoding(Record[Idx++])); |
| return 1; |
| } |
| |
| // FIXME: use the diagnostics machinery |
| static bool Error(const char *Str) { |
| std::fprintf(stderr, "%s\n", Str); |
| return true; |
| } |
| |
| /// \brief Check the contents of the predefines buffer against the |
| /// contents of the predefines buffer used to build the PCH file. |
| /// |
| /// The contents of the two predefines buffers should be the same. If |
| /// not, then some command-line option changed the preprocessor state |
| /// and we must reject the PCH file. |
| /// |
| /// \param PCHPredef The start of the predefines buffer in the PCH |
| /// file. |
| /// |
| /// \param PCHPredefLen The length of the predefines buffer in the PCH |
| /// file. |
| /// |
| /// \param PCHBufferID The FileID for the PCH predefines buffer. |
| /// |
| /// \returns true if there was a mismatch (in which case the PCH file |
| /// should be ignored), or false otherwise. |
| bool PCHReader::CheckPredefinesBuffer(const char *PCHPredef, |
| unsigned PCHPredefLen, |
| FileID PCHBufferID) { |
| const char *Predef = PP.getPredefines().c_str(); |
| unsigned PredefLen = PP.getPredefines().size(); |
| |
| // If the two predefines buffers compare equal, we're done!. |
| if (PredefLen == PCHPredefLen && |
| strncmp(Predef, PCHPredef, PCHPredefLen) == 0) |
| return false; |
| |
| // The predefines buffers are different. Produce a reasonable |
| // diagnostic showing where they are different. |
| |
| // The source locations (potentially in the two different predefines |
| // buffers) |
| SourceLocation Loc1, Loc2; |
| SourceManager &SourceMgr = PP.getSourceManager(); |
| |
| // Create a source buffer for our predefines string, so |
| // that we can build a diagnostic that points into that |
| // source buffer. |
| FileID BufferID; |
| if (Predef && Predef[0]) { |
| llvm::MemoryBuffer *Buffer |
| = llvm::MemoryBuffer::getMemBuffer(Predef, Predef + PredefLen, |
| "<built-in>"); |
| BufferID = SourceMgr.createFileIDForMemBuffer(Buffer); |
| } |
| |
| unsigned MinLen = std::min(PredefLen, PCHPredefLen); |
| std::pair<const char *, const char *> Locations |
| = std::mismatch(Predef, Predef + MinLen, PCHPredef); |
| |
| if (Locations.first != Predef + MinLen) { |
| // We found the location in the two buffers where there is a |
| // difference. Form source locations to point there (in both |
| // buffers). |
| unsigned Offset = Locations.first - Predef; |
| Loc1 = SourceMgr.getLocForStartOfFile(BufferID) |
| .getFileLocWithOffset(Offset); |
| Loc2 = SourceMgr.getLocForStartOfFile(PCHBufferID) |
| .getFileLocWithOffset(Offset); |
| } else if (PredefLen > PCHPredefLen) { |
| Loc1 = SourceMgr.getLocForStartOfFile(BufferID) |
| .getFileLocWithOffset(MinLen); |
| } else { |
| Loc1 = SourceMgr.getLocForStartOfFile(PCHBufferID) |
| .getFileLocWithOffset(MinLen); |
| } |
| |
| Diag(Loc1, diag::warn_pch_preprocessor); |
| if (Loc2.isValid()) |
| Diag(Loc2, diag::note_predef_in_pch); |
| Diag(diag::note_ignoring_pch) << FileName; |
| return true; |
| } |
| |
| /// \brief Read the line table in the source manager block. |
| /// \returns true if ther was an error. |
| static bool ParseLineTable(SourceManager &SourceMgr, |
| llvm::SmallVectorImpl<uint64_t> &Record) { |
| unsigned Idx = 0; |
| LineTableInfo &LineTable = SourceMgr.getLineTable(); |
| |
| // Parse the file names |
| std::map<int, int> FileIDs; |
| for (int I = 0, N = Record[Idx++]; I != N; ++I) { |
| // Extract the file name |
| unsigned FilenameLen = Record[Idx++]; |
| std::string Filename(&Record[Idx], &Record[Idx] + FilenameLen); |
| Idx += FilenameLen; |
| FileIDs[I] = LineTable.getLineTableFilenameID(Filename.c_str(), |
| Filename.size()); |
| } |
| |
| // Parse the line entries |
| std::vector<LineEntry> Entries; |
| while (Idx < Record.size()) { |
| int FID = FileIDs[Record[Idx++]]; |
| |
| // Extract the line entries |
| unsigned NumEntries = Record[Idx++]; |
| Entries.clear(); |
| Entries.reserve(NumEntries); |
| for (unsigned I = 0; I != NumEntries; ++I) { |
| unsigned FileOffset = Record[Idx++]; |
| unsigned LineNo = Record[Idx++]; |
| int FilenameID = Record[Idx++]; |
| SrcMgr::CharacteristicKind FileKind |
| = (SrcMgr::CharacteristicKind)Record[Idx++]; |
| unsigned IncludeOffset = Record[Idx++]; |
| Entries.push_back(LineEntry::get(FileOffset, LineNo, FilenameID, |
| FileKind, IncludeOffset)); |
| } |
| LineTable.AddEntry(FID, Entries); |
| } |
| |
| return false; |
| } |
| |
| /// \brief Read the source manager block |
| PCHReader::PCHReadResult PCHReader::ReadSourceManagerBlock() { |
| using namespace SrcMgr; |
| if (Stream.EnterSubBlock(pch::SOURCE_MANAGER_BLOCK_ID)) { |
| Error("Malformed source manager block record"); |
| return Failure; |
| } |
| |
| SourceManager &SourceMgr = Context.getSourceManager(); |
| RecordData Record; |
| while (true) { |
| unsigned Code = Stream.ReadCode(); |
| if (Code == llvm::bitc::END_BLOCK) { |
| if (Stream.ReadBlockEnd()) { |
| Error("Error at end of Source Manager block"); |
| return Failure; |
| } |
| |
| return Success; |
| } |
| |
| if (Code == llvm::bitc::ENTER_SUBBLOCK) { |
| // No known subblocks, always skip them. |
| Stream.ReadSubBlockID(); |
| if (Stream.SkipBlock()) { |
| Error("Malformed block record"); |
| return Failure; |
| } |
| continue; |
| } |
| |
| if (Code == llvm::bitc::DEFINE_ABBREV) { |
| Stream.ReadAbbrevRecord(); |
| continue; |
| } |
| |
| // Read a record. |
| const char *BlobStart; |
| unsigned BlobLen; |
| Record.clear(); |
| switch (Stream.ReadRecord(Code, Record, &BlobStart, &BlobLen)) { |
| default: // Default behavior: ignore. |
| break; |
| |
| case pch::SM_SLOC_FILE_ENTRY: { |
| // FIXME: We would really like to delay the creation of this |
| // FileEntry until it is actually required, e.g., when producing |
| // a diagnostic with a source location in this file. |
| const FileEntry *File |
| = PP.getFileManager().getFile(BlobStart, BlobStart + BlobLen); |
| // FIXME: Error recovery if file cannot be found. |
| FileID ID = SourceMgr.createFileID(File, |
| SourceLocation::getFromRawEncoding(Record[1]), |
| (CharacteristicKind)Record[2]); |
| if (Record[3]) |
| const_cast<SrcMgr::FileInfo&>(SourceMgr.getSLocEntry(ID).getFile()) |
| .setHasLineDirectives(); |
| break; |
| } |
| |
| case pch::SM_SLOC_BUFFER_ENTRY: { |
| const char *Name = BlobStart; |
| unsigned Code = Stream.ReadCode(); |
| Record.clear(); |
| unsigned RecCode = Stream.ReadRecord(Code, Record, &BlobStart, &BlobLen); |
| assert(RecCode == pch::SM_SLOC_BUFFER_BLOB && "Ill-formed PCH file"); |
| llvm::MemoryBuffer *Buffer |
| = llvm::MemoryBuffer::getMemBuffer(BlobStart, |
| BlobStart + BlobLen - 1, |
| Name); |
| FileID BufferID = SourceMgr.createFileIDForMemBuffer(Buffer); |
| |
| if (strcmp(Name, "<built-in>") == 0 |
| && CheckPredefinesBuffer(BlobStart, BlobLen - 1, BufferID)) |
| return IgnorePCH; |
| break; |
| } |
| |
| case pch::SM_SLOC_INSTANTIATION_ENTRY: { |
| SourceLocation SpellingLoc |
| = SourceLocation::getFromRawEncoding(Record[1]); |
| SourceMgr.createInstantiationLoc( |
| SpellingLoc, |
| SourceLocation::getFromRawEncoding(Record[2]), |
| SourceLocation::getFromRawEncoding(Record[3]), |
| Lexer::MeasureTokenLength(SpellingLoc, |
| SourceMgr, |
| PP.getLangOptions())); |
| break; |
| } |
| |
| case pch::SM_LINE_TABLE: |
| if (ParseLineTable(SourceMgr, Record)) |
| return Failure; |
| break; |
| } |
| } |
| } |
| |
| bool PCHReader::ReadPreprocessorBlock() { |
| if (Stream.EnterSubBlock(pch::PREPROCESSOR_BLOCK_ID)) |
| return Error("Malformed preprocessor block record"); |
| |
| RecordData Record; |
| llvm::SmallVector<IdentifierInfo*, 16> MacroArgs; |
| MacroInfo *LastMacro = 0; |
| |
| while (true) { |
| unsigned Code = Stream.ReadCode(); |
| switch (Code) { |
| case llvm::bitc::END_BLOCK: |
| if (Stream.ReadBlockEnd()) |
| return Error("Error at end of preprocessor block"); |
| return false; |
| |
| case llvm::bitc::ENTER_SUBBLOCK: |
| // No known subblocks, always skip them. |
| Stream.ReadSubBlockID(); |
| if (Stream.SkipBlock()) |
| return Error("Malformed block record"); |
| continue; |
| |
| case llvm::bitc::DEFINE_ABBREV: |
| Stream.ReadAbbrevRecord(); |
| continue; |
| default: break; |
| } |
| |
| // Read a record. |
| Record.clear(); |
| pch::PreprocessorRecordTypes RecType = |
| (pch::PreprocessorRecordTypes)Stream.ReadRecord(Code, Record); |
| switch (RecType) { |
| default: // Default behavior: ignore unknown records. |
| break; |
| case pch::PP_COUNTER_VALUE: |
| if (!Record.empty()) |
| PP.setCounterValue(Record[0]); |
| break; |
| |
| case pch::PP_MACRO_OBJECT_LIKE: |
| case pch::PP_MACRO_FUNCTION_LIKE: { |
| IdentifierInfo *II = DecodeIdentifierInfo(Record[0]); |
| if (II == 0) |
| return Error("Macro must have a name"); |
| SourceLocation Loc = SourceLocation::getFromRawEncoding(Record[1]); |
| bool isUsed = Record[2]; |
| |
| MacroInfo *MI = PP.AllocateMacroInfo(Loc); |
| MI->setIsUsed(isUsed); |
| |
| if (RecType == pch::PP_MACRO_FUNCTION_LIKE) { |
| // Decode function-like macro info. |
| bool isC99VarArgs = Record[3]; |
| bool isGNUVarArgs = Record[4]; |
| MacroArgs.clear(); |
| unsigned NumArgs = Record[5]; |
| for (unsigned i = 0; i != NumArgs; ++i) |
| MacroArgs.push_back(DecodeIdentifierInfo(Record[6+i])); |
| |
| // Install function-like macro info. |
| MI->setIsFunctionLike(); |
| if (isC99VarArgs) MI->setIsC99Varargs(); |
| if (isGNUVarArgs) MI->setIsGNUVarargs(); |
| MI->setArgumentList(&MacroArgs[0], MacroArgs.size(), |
| PP.getPreprocessorAllocator()); |
| } |
| |
| // Finally, install the macro. |
| PP.setMacroInfo(II, MI); |
| |
| // Remember that we saw this macro last so that we add the tokens that |
| // form its body to it. |
| LastMacro = MI; |
| break; |
| } |
| |
| case pch::PP_TOKEN: { |
| // If we see a TOKEN before a PP_MACRO_*, then the file is eroneous, just |
| // pretend we didn't see this. |
| if (LastMacro == 0) break; |
| |
| Token Tok; |
| Tok.startToken(); |
| Tok.setLocation(SourceLocation::getFromRawEncoding(Record[0])); |
| Tok.setLength(Record[1]); |
| if (IdentifierInfo *II = DecodeIdentifierInfo(Record[2])) |
| Tok.setIdentifierInfo(II); |
| Tok.setKind((tok::TokenKind)Record[3]); |
| Tok.setFlag((Token::TokenFlags)Record[4]); |
| LastMacro->AddTokenToBody(Tok); |
| break; |
| } |
| } |
| } |
| } |
| |
| PCHReader::PCHReadResult PCHReader::ReadPCHBlock() { |
| if (Stream.EnterSubBlock(pch::PCH_BLOCK_ID)) { |
| Error("Malformed block record"); |
| return Failure; |
| } |
| |
| uint64_t PreprocessorBlockBit = 0; |
| |
| // Read all of the records and blocks for the PCH file. |
| RecordData Record; |
| while (!Stream.AtEndOfStream()) { |
| unsigned Code = Stream.ReadCode(); |
| if (Code == llvm::bitc::END_BLOCK) { |
| // If we saw the preprocessor block, read it now. |
| if (PreprocessorBlockBit) { |
| uint64_t SavedPos = Stream.GetCurrentBitNo(); |
| Stream.JumpToBit(PreprocessorBlockBit); |
| if (ReadPreprocessorBlock()) { |
| Error("Malformed preprocessor block"); |
| return Failure; |
| } |
| Stream.JumpToBit(SavedPos); |
| } |
| |
| if (Stream.ReadBlockEnd()) { |
| Error("Error at end of module block"); |
| return Failure; |
| } |
| |
| return Success; |
| } |
| |
| if (Code == llvm::bitc::ENTER_SUBBLOCK) { |
| switch (Stream.ReadSubBlockID()) { |
| case pch::DECLS_BLOCK_ID: // Skip decls block (lazily loaded) |
| case pch::TYPES_BLOCK_ID: // Skip types block (lazily loaded) |
| default: // Skip unknown content. |
| if (Stream.SkipBlock()) { |
| Error("Malformed block record"); |
| return Failure; |
| } |
| break; |
| |
| case pch::PREPROCESSOR_BLOCK_ID: |
| // Skip the preprocessor block for now, but remember where it is. We |
| // want to read it in after the identifier table. |
| if (PreprocessorBlockBit) { |
| Error("Multiple preprocessor blocks found."); |
| return Failure; |
| } |
| PreprocessorBlockBit = Stream.GetCurrentBitNo(); |
| if (Stream.SkipBlock()) { |
| Error("Malformed block record"); |
| return Failure; |
| } |
| break; |
| |
| case pch::SOURCE_MANAGER_BLOCK_ID: |
| switch (ReadSourceManagerBlock()) { |
| case Success: |
| break; |
| |
| case Failure: |
| Error("Malformed source manager block"); |
| return Failure; |
| |
| case IgnorePCH: |
| return IgnorePCH; |
| } |
| break; |
| } |
| continue; |
| } |
| |
| if (Code == llvm::bitc::DEFINE_ABBREV) { |
| Stream.ReadAbbrevRecord(); |
| continue; |
| } |
| |
| // Read and process a record. |
| Record.clear(); |
| const char *BlobStart = 0; |
| unsigned BlobLen = 0; |
| switch ((pch::PCHRecordTypes)Stream.ReadRecord(Code, Record, |
| &BlobStart, &BlobLen)) { |
| default: // Default behavior: ignore. |
| break; |
| |
| case pch::TYPE_OFFSET: |
| if (!TypeOffsets.empty()) { |
| Error("Duplicate TYPE_OFFSET record in PCH file"); |
| return Failure; |
| } |
| TypeOffsets.swap(Record); |
| TypeAlreadyLoaded.resize(TypeOffsets.size(), false); |
| break; |
| |
| case pch::DECL_OFFSET: |
| if (!DeclOffsets.empty()) { |
| Error("Duplicate DECL_OFFSET record in PCH file"); |
| return Failure; |
| } |
| DeclOffsets.swap(Record); |
| DeclAlreadyLoaded.resize(DeclOffsets.size(), false); |
| break; |
| |
| case pch::LANGUAGE_OPTIONS: |
| if (ParseLanguageOptions(Record)) |
| return IgnorePCH; |
| break; |
| |
| case pch::TARGET_TRIPLE: { |
| std::string TargetTriple(BlobStart, BlobLen); |
| if (TargetTriple != Context.Target.getTargetTriple()) { |
| Diag(diag::warn_pch_target_triple) |
| << TargetTriple << Context.Target.getTargetTriple(); |
| Diag(diag::note_ignoring_pch) << FileName; |
| return IgnorePCH; |
| } |
| break; |
| } |
| |
| case pch::IDENTIFIER_TABLE: |
| IdentifierTable = BlobStart; |
| break; |
| |
| case pch::IDENTIFIER_OFFSET: |
| if (!IdentifierData.empty()) { |
| Error("Duplicate IDENTIFIER_OFFSET record in PCH file"); |
| return Failure; |
| } |
| IdentifierData.swap(Record); |
| #ifndef NDEBUG |
| for (unsigned I = 0, N = IdentifierData.size(); I != N; ++I) { |
| if ((IdentifierData[I] & 0x01) == 0) { |
| Error("Malformed identifier table in the precompiled header"); |
| return Failure; |
| } |
| } |
| #endif |
| break; |
| |
| case pch::EXTERNAL_DEFINITIONS: |
| if (!ExternalDefinitions.empty()) { |
| Error("Duplicate EXTERNAL_DEFINITIONS record in PCH file"); |
| return Failure; |
| } |
| ExternalDefinitions.swap(Record); |
| break; |
| } |
| } |
| |
| Error("Premature end of bitstream"); |
| return Failure; |
| } |
| |
| PCHReader::PCHReadResult PCHReader::ReadPCH(const std::string &FileName) { |
| // Set the PCH file name. |
| this->FileName = FileName; |
| |
| // Open the PCH file. |
| std::string ErrStr; |
| Buffer.reset(llvm::MemoryBuffer::getFile(FileName.c_str(), &ErrStr)); |
| if (!Buffer) { |
| Error(ErrStr.c_str()); |
| return IgnorePCH; |
| } |
| |
| // Initialize the stream |
| Stream.init((const unsigned char *)Buffer->getBufferStart(), |
| (const unsigned char *)Buffer->getBufferEnd()); |
| |
| // Sniff for the signature. |
| if (Stream.Read(8) != 'C' || |
| Stream.Read(8) != 'P' || |
| Stream.Read(8) != 'C' || |
| Stream.Read(8) != 'H') { |
| Error("Not a PCH file"); |
| return IgnorePCH; |
| } |
| |
| // We expect a number of well-defined blocks, though we don't necessarily |
| // need to understand them all. |
| while (!Stream.AtEndOfStream()) { |
| unsigned Code = Stream.ReadCode(); |
| |
| if (Code != llvm::bitc::ENTER_SUBBLOCK) { |
| Error("Invalid record at top-level"); |
| return Failure; |
| } |
| |
| unsigned BlockID = Stream.ReadSubBlockID(); |
| |
| // We only know the PCH subblock ID. |
| switch (BlockID) { |
| case llvm::bitc::BLOCKINFO_BLOCK_ID: |
| if (Stream.ReadBlockInfoBlock()) { |
| Error("Malformed BlockInfoBlock"); |
| return Failure; |
| } |
| break; |
| case pch::PCH_BLOCK_ID: |
| switch (ReadPCHBlock()) { |
| case Success: |
| break; |
| |
| case Failure: |
| return Failure; |
| |
| case IgnorePCH: |
| // FIXME: We could consider reading through to the end of this |
| // PCH block, skipping subblocks, to see if there are other |
| // PCH blocks elsewhere. |
| return IgnorePCH; |
| } |
| break; |
| default: |
| if (Stream.SkipBlock()) { |
| Error("Malformed block record"); |
| return Failure; |
| } |
| break; |
| } |
| } |
| |
| // Load the translation unit declaration |
| ReadDeclRecord(DeclOffsets[0], 0); |
| |
| return Success; |
| } |
| |
| namespace { |
| /// \brief Helper class that saves the current stream position and |
| /// then restores it when destroyed. |
| struct VISIBILITY_HIDDEN SavedStreamPosition { |
| explicit SavedStreamPosition(llvm::BitstreamReader &Stream) |
| : Stream(Stream), Offset(Stream.GetCurrentBitNo()) { } |
| |
| ~SavedStreamPosition() { |
| Stream.JumpToBit(Offset); |
| } |
| |
| private: |
| llvm::BitstreamReader &Stream; |
| uint64_t Offset; |
| }; |
| } |
| |
| /// \brief Parse the record that corresponds to a LangOptions data |
| /// structure. |
| /// |
| /// This routine compares the language options used to generate the |
| /// PCH file against the language options set for the current |
| /// compilation. For each option, we classify differences between the |
| /// two compiler states as either "benign" or "important". Benign |
| /// differences don't matter, and we accept them without complaint |
| /// (and without modifying the language options). Differences between |
| /// the states for important options cause the PCH file to be |
| /// unusable, so we emit a warning and return true to indicate that |
| /// there was an error. |
| /// |
| /// \returns true if the PCH file is unacceptable, false otherwise. |
| bool PCHReader::ParseLanguageOptions( |
| const llvm::SmallVectorImpl<uint64_t> &Record) { |
| const LangOptions &LangOpts = Context.getLangOptions(); |
| #define PARSE_LANGOPT_BENIGN(Option) ++Idx |
| #define PARSE_LANGOPT_IMPORTANT(Option, DiagID) \ |
| if (Record[Idx] != LangOpts.Option) { \ |
| Diag(DiagID) << (unsigned)Record[Idx] << LangOpts.Option; \ |
| Diag(diag::note_ignoring_pch) << FileName; \ |
| return true; \ |
| } \ |
| ++Idx |
| |
| unsigned Idx = 0; |
| PARSE_LANGOPT_BENIGN(Trigraphs); |
| PARSE_LANGOPT_BENIGN(BCPLComment); |
| PARSE_LANGOPT_BENIGN(DollarIdents); |
| PARSE_LANGOPT_BENIGN(AsmPreprocessor); |
| PARSE_LANGOPT_IMPORTANT(GNUMode, diag::warn_pch_gnu_extensions); |
| PARSE_LANGOPT_BENIGN(ImplicitInt); |
| PARSE_LANGOPT_BENIGN(Digraphs); |
| PARSE_LANGOPT_BENIGN(HexFloats); |
| PARSE_LANGOPT_IMPORTANT(C99, diag::warn_pch_c99); |
| PARSE_LANGOPT_IMPORTANT(Microsoft, diag::warn_pch_microsoft_extensions); |
| PARSE_LANGOPT_IMPORTANT(CPlusPlus, diag::warn_pch_cplusplus); |
| PARSE_LANGOPT_IMPORTANT(CPlusPlus0x, diag::warn_pch_cplusplus0x); |
| PARSE_LANGOPT_IMPORTANT(NoExtensions, diag::warn_pch_extensions); |
| PARSE_LANGOPT_BENIGN(CXXOperatorName); |
| PARSE_LANGOPT_IMPORTANT(ObjC1, diag::warn_pch_objective_c); |
| PARSE_LANGOPT_IMPORTANT(ObjC2, diag::warn_pch_objective_c2); |
| PARSE_LANGOPT_IMPORTANT(ObjCNonFragileABI, diag::warn_pch_nonfragile_abi); |
| PARSE_LANGOPT_BENIGN(PascalStrings); |
| PARSE_LANGOPT_BENIGN(Boolean); |
| PARSE_LANGOPT_BENIGN(WritableStrings); |
| PARSE_LANGOPT_IMPORTANT(LaxVectorConversions, |
| diag::warn_pch_lax_vector_conversions); |
| PARSE_LANGOPT_IMPORTANT(Exceptions, diag::warn_pch_exceptions); |
| PARSE_LANGOPT_IMPORTANT(NeXTRuntime, diag::warn_pch_objc_runtime); |
| PARSE_LANGOPT_IMPORTANT(Freestanding, diag::warn_pch_freestanding); |
| PARSE_LANGOPT_IMPORTANT(NoBuiltin, diag::warn_pch_builtins); |
| PARSE_LANGOPT_IMPORTANT(ThreadsafeStatics, |
| diag::warn_pch_thread_safe_statics); |
| PARSE_LANGOPT_IMPORTANT(Blocks, diag::warn_pch_blocks); |
| PARSE_LANGOPT_BENIGN(EmitAllDecls); |
| PARSE_LANGOPT_IMPORTANT(MathErrno, diag::warn_pch_math_errno); |
| PARSE_LANGOPT_IMPORTANT(OverflowChecking, diag::warn_pch_overflow_checking); |
| PARSE_LANGOPT_IMPORTANT(HeinousExtensions, |
| diag::warn_pch_heinous_extensions); |
| // FIXME: Most of the options below are benign if the macro wasn't |
| // used. Unfortunately, this means that a PCH compiled without |
| // optimization can't be used with optimization turned on, even |
| // though the only thing that changes is whether __OPTIMIZE__ was |
| // defined... but if __OPTIMIZE__ never showed up in the header, it |
| // doesn't matter. We could consider making this some special kind |
| // of check. |
| PARSE_LANGOPT_IMPORTANT(Optimize, diag::warn_pch_optimize); |
| PARSE_LANGOPT_IMPORTANT(OptimizeSize, diag::warn_pch_optimize_size); |
| PARSE_LANGOPT_IMPORTANT(Static, diag::warn_pch_static); |
| PARSE_LANGOPT_IMPORTANT(PICLevel, diag::warn_pch_pic_level); |
| PARSE_LANGOPT_IMPORTANT(GNUInline, diag::warn_pch_gnu_inline); |
| PARSE_LANGOPT_IMPORTANT(NoInline, diag::warn_pch_no_inline); |
| if ((LangOpts.getGCMode() != 0) != (Record[Idx] != 0)) { |
| Diag(diag::warn_pch_gc_mode) |
| << (unsigned)Record[Idx] << LangOpts.getGCMode(); |
| Diag(diag::note_ignoring_pch) << FileName; |
| return true; |
| } |
| ++Idx; |
| PARSE_LANGOPT_BENIGN(getVisibilityMode()); |
| PARSE_LANGOPT_BENIGN(InstantiationDepth); |
| #undef PARSE_LANGOPT_IRRELEVANT |
| #undef PARSE_LANGOPT_BENIGN |
| |
| return false; |
| } |
| |
| /// \brief Read and return the type at the given offset. |
| /// |
| /// This routine actually reads the record corresponding to the type |
| /// at the given offset in the bitstream. It is a helper routine for |
| /// GetType, which deals with reading type IDs. |
| QualType PCHReader::ReadTypeRecord(uint64_t Offset) { |
| // Keep track of where we are in the stream, then jump back there |
| // after reading this type. |
| SavedStreamPosition SavedPosition(Stream); |
| |
| Stream.JumpToBit(Offset); |
| RecordData Record; |
| unsigned Code = Stream.ReadCode(); |
| switch ((pch::TypeCode)Stream.ReadRecord(Code, Record)) { |
| case pch::TYPE_EXT_QUAL: |
| // FIXME: Deserialize ExtQualType |
| assert(false && "Cannot deserialize qualified types yet"); |
| return QualType(); |
| |
| case pch::TYPE_FIXED_WIDTH_INT: { |
| assert(Record.size() == 2 && "Incorrect encoding of fixed-width int type"); |
| return Context.getFixedWidthIntType(Record[0], Record[1]); |
| } |
| |
| case pch::TYPE_COMPLEX: { |
| assert(Record.size() == 1 && "Incorrect encoding of complex type"); |
| QualType ElemType = GetType(Record[0]); |
| return Context.getComplexType(ElemType); |
| } |
| |
| case pch::TYPE_POINTER: { |
| assert(Record.size() == 1 && "Incorrect encoding of pointer type"); |
| QualType PointeeType = GetType(Record[0]); |
| return Context.getPointerType(PointeeType); |
| } |
| |
| case pch::TYPE_BLOCK_POINTER: { |
| assert(Record.size() == 1 && "Incorrect encoding of block pointer type"); |
| QualType PointeeType = GetType(Record[0]); |
| return Context.getBlockPointerType(PointeeType); |
| } |
| |
| case pch::TYPE_LVALUE_REFERENCE: { |
| assert(Record.size() == 1 && "Incorrect encoding of lvalue reference type"); |
| QualType PointeeType = GetType(Record[0]); |
| return Context.getLValueReferenceType(PointeeType); |
| } |
| |
| case pch::TYPE_RVALUE_REFERENCE: { |
| assert(Record.size() == 1 && "Incorrect encoding of rvalue reference type"); |
| QualType PointeeType = GetType(Record[0]); |
| return Context.getRValueReferenceType(PointeeType); |
| } |
| |
| case pch::TYPE_MEMBER_POINTER: { |
| assert(Record.size() == 1 && "Incorrect encoding of member pointer type"); |
| QualType PointeeType = GetType(Record[0]); |
| QualType ClassType = GetType(Record[1]); |
| return Context.getMemberPointerType(PointeeType, ClassType.getTypePtr()); |
| } |
| |
| case pch::TYPE_CONSTANT_ARRAY: { |
| QualType ElementType = GetType(Record[0]); |
| ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1]; |
| unsigned IndexTypeQuals = Record[2]; |
| unsigned Idx = 3; |
| llvm::APInt Size = ReadAPInt(Record, Idx); |
| return Context.getConstantArrayType(ElementType, Size, ASM, IndexTypeQuals); |
| } |
| |
| case pch::TYPE_INCOMPLETE_ARRAY: { |
| QualType ElementType = GetType(Record[0]); |
| ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1]; |
| unsigned IndexTypeQuals = Record[2]; |
| return Context.getIncompleteArrayType(ElementType, ASM, IndexTypeQuals); |
| } |
| |
| case pch::TYPE_VARIABLE_ARRAY: { |
| QualType ElementType = GetType(Record[0]); |
| ArrayType::ArraySizeModifier ASM = (ArrayType::ArraySizeModifier)Record[1]; |
| unsigned IndexTypeQuals = Record[2]; |
| return Context.getVariableArrayType(ElementType, ReadExpr(), |
| ASM, IndexTypeQuals); |
| } |
| |
| case pch::TYPE_VECTOR: { |
| if (Record.size() != 2) { |
| Error("Incorrect encoding of vector type in PCH file"); |
| return QualType(); |
| } |
| |
| QualType ElementType = GetType(Record[0]); |
| unsigned NumElements = Record[1]; |
| return Context.getVectorType(ElementType, NumElements); |
| } |
| |
| case pch::TYPE_EXT_VECTOR: { |
| if (Record.size() != 2) { |
| Error("Incorrect encoding of extended vector type in PCH file"); |
| return QualType(); |
| } |
| |
| QualType ElementType = GetType(Record[0]); |
| unsigned NumElements = Record[1]; |
| return Context.getExtVectorType(ElementType, NumElements); |
| } |
| |
| case pch::TYPE_FUNCTION_NO_PROTO: { |
| if (Record.size() != 1) { |
| Error("Incorrect encoding of no-proto function type"); |
| return QualType(); |
| } |
| QualType ResultType = GetType(Record[0]); |
| return Context.getFunctionNoProtoType(ResultType); |
| } |
| |
| case pch::TYPE_FUNCTION_PROTO: { |
| QualType ResultType = GetType(Record[0]); |
| unsigned Idx = 1; |
| unsigned NumParams = Record[Idx++]; |
| llvm::SmallVector<QualType, 16> ParamTypes; |
| for (unsigned I = 0; I != NumParams; ++I) |
| ParamTypes.push_back(GetType(Record[Idx++])); |
| bool isVariadic = Record[Idx++]; |
| unsigned Quals = Record[Idx++]; |
| return Context.getFunctionType(ResultType, &ParamTypes[0], NumParams, |
| isVariadic, Quals); |
| } |
| |
| case pch::TYPE_TYPEDEF: |
| assert(Record.size() == 1 && "Incorrect encoding of typedef type"); |
| return Context.getTypeDeclType(cast<TypedefDecl>(GetDecl(Record[0]))); |
| |
| case pch::TYPE_TYPEOF_EXPR: |
| return Context.getTypeOfExprType(ReadExpr()); |
| |
| case pch::TYPE_TYPEOF: { |
| if (Record.size() != 1) { |
| Error("Incorrect encoding of typeof(type) in PCH file"); |
| return QualType(); |
| } |
| QualType UnderlyingType = GetType(Record[0]); |
| return Context.getTypeOfType(UnderlyingType); |
| } |
| |
| case pch::TYPE_RECORD: |
| assert(Record.size() == 1 && "Incorrect encoding of record type"); |
| return Context.getTypeDeclType(cast<RecordDecl>(GetDecl(Record[0]))); |
| |
| case pch::TYPE_ENUM: |
| assert(Record.size() == 1 && "Incorrect encoding of enum type"); |
| return Context.getTypeDeclType(cast<EnumDecl>(GetDecl(Record[0]))); |
| |
| case pch::TYPE_OBJC_INTERFACE: |
| // FIXME: Deserialize ObjCInterfaceType |
| assert(false && "Cannot de-serialize ObjC interface types yet"); |
| return QualType(); |
| |
| case pch::TYPE_OBJC_QUALIFIED_INTERFACE: |
| // FIXME: Deserialize ObjCQualifiedInterfaceType |
| assert(false && "Cannot de-serialize ObjC qualified interface types yet"); |
| return QualType(); |
| |
| case pch::TYPE_OBJC_QUALIFIED_ID: |
| // FIXME: Deserialize ObjCQualifiedIdType |
| assert(false && "Cannot de-serialize ObjC qualified id types yet"); |
| return QualType(); |
| |
| case pch::TYPE_OBJC_QUALIFIED_CLASS: |
| // FIXME: Deserialize ObjCQualifiedClassType |
| assert(false && "Cannot de-serialize ObjC qualified class types yet"); |
| return QualType(); |
| } |
| |
| // Suppress a GCC warning |
| return QualType(); |
| } |
| |
| /// \brief Note that we have loaded the declaration with the given |
| /// Index. |
| /// |
| /// This routine notes that this declaration has already been loaded, |
| /// so that future GetDecl calls will return this declaration rather |
| /// than trying to load a new declaration. |
| inline void PCHReader::LoadedDecl(unsigned Index, Decl *D) { |
| assert(!DeclAlreadyLoaded[Index] && "Decl loaded twice?"); |
| DeclAlreadyLoaded[Index] = true; |
| DeclOffsets[Index] = reinterpret_cast<uint64_t>(D); |
| } |
| |
| /// \brief Read the declaration at the given offset from the PCH file. |
| Decl *PCHReader::ReadDeclRecord(uint64_t Offset, unsigned Index) { |
| // Keep track of where we are in the stream, then jump back there |
| // after reading this declaration. |
| SavedStreamPosition SavedPosition(Stream); |
| |
| Decl *D = 0; |
| Stream.JumpToBit(Offset); |
| RecordData Record; |
| unsigned Code = Stream.ReadCode(); |
| unsigned Idx = 0; |
| PCHDeclReader Reader(*this, Record, Idx); |
| |
| switch ((pch::DeclCode)Stream.ReadRecord(Code, Record)) { |
| case pch::DECL_TRANSLATION_UNIT: |
| assert(Index == 0 && "Translation unit must be at index 0"); |
| Reader.VisitTranslationUnitDecl(Context.getTranslationUnitDecl()); |
| D = Context.getTranslationUnitDecl(); |
| LoadedDecl(Index, D); |
| break; |
| |
| case pch::DECL_TYPEDEF: { |
| TypedefDecl *Typedef = TypedefDecl::Create(Context, 0, SourceLocation(), |
| 0, QualType()); |
| LoadedDecl(Index, Typedef); |
| Reader.VisitTypedefDecl(Typedef); |
| D = Typedef; |
| break; |
| } |
| |
| case pch::DECL_ENUM: { |
| EnumDecl *Enum = EnumDecl::Create(Context, 0, SourceLocation(), 0, 0); |
| LoadedDecl(Index, Enum); |
| Reader.VisitEnumDecl(Enum); |
| D = Enum; |
| break; |
| } |
| |
| case pch::DECL_RECORD: { |
| RecordDecl *Record = RecordDecl::Create(Context, TagDecl::TK_struct, |
| 0, SourceLocation(), 0, 0); |
| LoadedDecl(Index, Record); |
| Reader.VisitRecordDecl(Record); |
| D = Record; |
| break; |
| } |
| |
| case pch::DECL_ENUM_CONSTANT: { |
| EnumConstantDecl *ECD = EnumConstantDecl::Create(Context, 0, |
| SourceLocation(), 0, |
| QualType(), 0, |
| llvm::APSInt()); |
| LoadedDecl(Index, ECD); |
| Reader.VisitEnumConstantDecl(ECD); |
| D = ECD; |
| break; |
| } |
| |
| case pch::DECL_FUNCTION: { |
| FunctionDecl *Function = FunctionDecl::Create(Context, 0, SourceLocation(), |
| DeclarationName(), |
| QualType()); |
| LoadedDecl(Index, Function); |
| Reader.VisitFunctionDecl(Function); |
| D = Function; |
| break; |
| } |
| |
| case pch::DECL_FIELD: { |
| FieldDecl *Field = FieldDecl::Create(Context, 0, SourceLocation(), 0, |
| QualType(), 0, false); |
| LoadedDecl(Index, Field); |
| Reader.VisitFieldDecl(Field); |
| D = Field; |
| break; |
| } |
| |
| case pch::DECL_VAR: { |
| VarDecl *Var = VarDecl::Create(Context, 0, SourceLocation(), 0, QualType(), |
| VarDecl::None, SourceLocation()); |
| LoadedDecl(Index, Var); |
| Reader.VisitVarDecl(Var); |
| D = Var; |
| break; |
| } |
| |
| case pch::DECL_PARM_VAR: { |
| ParmVarDecl *Parm = ParmVarDecl::Create(Context, 0, SourceLocation(), 0, |
| QualType(), VarDecl::None, 0); |
| LoadedDecl(Index, Parm); |
| Reader.VisitParmVarDecl(Parm); |
| D = Parm; |
| break; |
| } |
| |
| case pch::DECL_ORIGINAL_PARM_VAR: { |
| OriginalParmVarDecl *Parm |
| = OriginalParmVarDecl::Create(Context, 0, SourceLocation(), 0, |
| QualType(), QualType(), VarDecl::None, |
| 0); |
| LoadedDecl(Index, Parm); |
| Reader.VisitOriginalParmVarDecl(Parm); |
| D = Parm; |
| break; |
| } |
| |
| case pch::DECL_FILE_SCOPE_ASM: { |
| FileScopeAsmDecl *Asm = FileScopeAsmDecl::Create(Context, 0, |
| SourceLocation(), 0); |
| LoadedDecl(Index, Asm); |
| Reader.VisitFileScopeAsmDecl(Asm); |
| D = Asm; |
| break; |
| } |
| |
| case pch::DECL_BLOCK: { |
| BlockDecl *Block = BlockDecl::Create(Context, 0, SourceLocation()); |
| LoadedDecl(Index, Block); |
| Reader.VisitBlockDecl(Block); |
| D = Block; |
| break; |
| } |
| |
| default: |
| assert(false && "Cannot de-serialize this kind of declaration"); |
| break; |
| } |
| |
| // If this declaration is also a declaration context, get the |
| // offsets for its tables of lexical and visible declarations. |
| if (DeclContext *DC = dyn_cast<DeclContext>(D)) { |
| std::pair<uint64_t, uint64_t> Offsets = Reader.VisitDeclContext(DC); |
| if (Offsets.first || Offsets.second) { |
| DC->setHasExternalLexicalStorage(Offsets.first != 0); |
| DC->setHasExternalVisibleStorage(Offsets.second != 0); |
| DeclContextOffsets[DC] = Offsets; |
| } |
| } |
| assert(Idx == Record.size()); |
| |
| return D; |
| } |
| |
| QualType PCHReader::GetType(pch::TypeID ID) { |
| unsigned Quals = ID & 0x07; |
| unsigned Index = ID >> 3; |
| |
| if (Index < pch::NUM_PREDEF_TYPE_IDS) { |
| QualType T; |
| switch ((pch::PredefinedTypeIDs)Index) { |
| case pch::PREDEF_TYPE_NULL_ID: return QualType(); |
| case pch::PREDEF_TYPE_VOID_ID: T = Context.VoidTy; break; |
| case pch::PREDEF_TYPE_BOOL_ID: T = Context.BoolTy; break; |
| |
| case pch::PREDEF_TYPE_CHAR_U_ID: |
| case pch::PREDEF_TYPE_CHAR_S_ID: |
| // FIXME: Check that the signedness of CharTy is correct! |
| T = Context.CharTy; |
| break; |
| |
| case pch::PREDEF_TYPE_UCHAR_ID: T = Context.UnsignedCharTy; break; |
| case pch::PREDEF_TYPE_USHORT_ID: T = Context.UnsignedShortTy; break; |
| case pch::PREDEF_TYPE_UINT_ID: T = Context.UnsignedIntTy; break; |
| case pch::PREDEF_TYPE_ULONG_ID: T = Context.UnsignedLongTy; break; |
| case pch::PREDEF_TYPE_ULONGLONG_ID: T = Context.UnsignedLongLongTy; break; |
| case pch::PREDEF_TYPE_SCHAR_ID: T = Context.SignedCharTy; break; |
| case pch::PREDEF_TYPE_WCHAR_ID: T = Context.WCharTy; break; |
| case pch::PREDEF_TYPE_SHORT_ID: T = Context.ShortTy; break; |
| case pch::PREDEF_TYPE_INT_ID: T = Context.IntTy; break; |
| case pch::PREDEF_TYPE_LONG_ID: T = Context.LongTy; break; |
| case pch::PREDEF_TYPE_LONGLONG_ID: T = Context.LongLongTy; break; |
| case pch::PREDEF_TYPE_FLOAT_ID: T = Context.FloatTy; break; |
| case pch::PREDEF_TYPE_DOUBLE_ID: T = Context.DoubleTy; break; |
| case pch::PREDEF_TYPE_LONGDOUBLE_ID: T = Context.LongDoubleTy; break; |
| case pch::PREDEF_TYPE_OVERLOAD_ID: T = Context.OverloadTy; break; |
| case pch::PREDEF_TYPE_DEPENDENT_ID: T = Context.DependentTy; break; |
| } |
| |
| assert(!T.isNull() && "Unknown predefined type"); |
| return T.getQualifiedType(Quals); |
| } |
| |
| Index -= pch::NUM_PREDEF_TYPE_IDS; |
| if (!TypeAlreadyLoaded[Index]) { |
| // Load the type from the PCH file. |
| TypeOffsets[Index] = reinterpret_cast<uint64_t>( |
| ReadTypeRecord(TypeOffsets[Index]).getTypePtr()); |
| TypeAlreadyLoaded[Index] = true; |
| } |
| |
| return QualType(reinterpret_cast<Type *>(TypeOffsets[Index]), Quals); |
| } |
| |
| Decl *PCHReader::GetDecl(pch::DeclID ID) { |
| if (ID == 0) |
| return 0; |
| |
| unsigned Index = ID - 1; |
| if (DeclAlreadyLoaded[Index]) |
| return reinterpret_cast<Decl *>(DeclOffsets[Index]); |
| |
| // Load the declaration from the PCH file. |
| return ReadDeclRecord(DeclOffsets[Index], Index); |
| } |
| |
| bool PCHReader::ReadDeclsLexicallyInContext(DeclContext *DC, |
| llvm::SmallVectorImpl<pch::DeclID> &Decls) { |
| assert(DC->hasExternalLexicalStorage() && |
| "DeclContext has no lexical decls in storage"); |
| uint64_t Offset = DeclContextOffsets[DC].first; |
| assert(Offset && "DeclContext has no lexical decls in storage"); |
| |
| // Keep track of where we are in the stream, then jump back there |
| // after reading this context. |
| SavedStreamPosition SavedPosition(Stream); |
| |
| // Load the record containing all of the declarations lexically in |
| // this context. |
| Stream.JumpToBit(Offset); |
| RecordData Record; |
| unsigned Code = Stream.ReadCode(); |
| unsigned RecCode = Stream.ReadRecord(Code, Record); |
| assert(RecCode == pch::DECL_CONTEXT_LEXICAL && "Expected lexical block"); |
| |
| // Load all of the declaration IDs |
| Decls.clear(); |
| Decls.insert(Decls.end(), Record.begin(), Record.end()); |
| return false; |
| } |
| |
| bool PCHReader::ReadDeclsVisibleInContext(DeclContext *DC, |
| llvm::SmallVectorImpl<VisibleDeclaration> & Decls) { |
| assert(DC->hasExternalVisibleStorage() && |
| "DeclContext has no visible decls in storage"); |
| uint64_t Offset = DeclContextOffsets[DC].second; |
| assert(Offset && "DeclContext has no visible decls in storage"); |
| |
| // Keep track of where we are in the stream, then jump back there |
| // after reading this context. |
| SavedStreamPosition SavedPosition(Stream); |
| |
| // Load the record containing all of the declarations visible in |
| // this context. |
| Stream.JumpToBit(Offset); |
| RecordData Record; |
| unsigned Code = Stream.ReadCode(); |
| unsigned RecCode = Stream.ReadRecord(Code, Record); |
| assert(RecCode == pch::DECL_CONTEXT_VISIBLE && "Expected visible block"); |
| if (Record.size() == 0) |
| return false; |
| |
| Decls.clear(); |
| |
| unsigned Idx = 0; |
| while (Idx < Record.size()) { |
| Decls.push_back(VisibleDeclaration()); |
| Decls.back().Name = ReadDeclarationName(Record, Idx); |
| |
| unsigned Size = Record[Idx++]; |
| llvm::SmallVector<unsigned, 4> & LoadedDecls |
| = Decls.back().Declarations; |
| LoadedDecls.reserve(Size); |
| for (unsigned I = 0; I < Size; ++I) |
| LoadedDecls.push_back(Record[Idx++]); |
| } |
| |
| return false; |
| } |
| |
| void PCHReader::StartTranslationUnit(ASTConsumer *Consumer) { |
| if (!Consumer) |
| return; |
| |
| for (unsigned I = 0, N = ExternalDefinitions.size(); I != N; ++I) { |
| Decl *D = GetDecl(ExternalDefinitions[I]); |
| DeclGroupRef DG(D); |
| Consumer->HandleTopLevelDecl(DG); |
| } |
| } |
| |
| void PCHReader::PrintStats() { |
| std::fprintf(stderr, "*** PCH Statistics:\n"); |
| |
| unsigned NumTypesLoaded = std::count(TypeAlreadyLoaded.begin(), |
| TypeAlreadyLoaded.end(), |
| true); |
| unsigned NumDeclsLoaded = std::count(DeclAlreadyLoaded.begin(), |
| DeclAlreadyLoaded.end(), |
| true); |
| unsigned NumIdentifiersLoaded = 0; |
| for (unsigned I = 0; I < IdentifierData.size(); ++I) { |
| if ((IdentifierData[I] & 0x01) == 0) |
| ++NumIdentifiersLoaded; |
| } |
| |
| std::fprintf(stderr, " %u/%u types read (%f%%)\n", |
| NumTypesLoaded, (unsigned)TypeAlreadyLoaded.size(), |
| ((float)NumTypesLoaded/TypeAlreadyLoaded.size() * 100)); |
| std::fprintf(stderr, " %u/%u declarations read (%f%%)\n", |
| NumDeclsLoaded, (unsigned)DeclAlreadyLoaded.size(), |
| ((float)NumDeclsLoaded/DeclAlreadyLoaded.size() * 100)); |
| std::fprintf(stderr, " %u/%u identifiers read (%f%%)\n", |
| NumIdentifiersLoaded, (unsigned)IdentifierData.size(), |
| ((float)NumIdentifiersLoaded/IdentifierData.size() * 100)); |
| std::fprintf(stderr, "\n"); |
| } |
| |
| IdentifierInfo *PCHReader::DecodeIdentifierInfo(unsigned ID) { |
| if (ID == 0) |
| return 0; |
| |
| if (!IdentifierTable || IdentifierData.empty()) { |
| Error("No identifier table in PCH file"); |
| return 0; |
| } |
| |
| if (IdentifierData[ID - 1] & 0x01) { |
| uint64_t Offset = IdentifierData[ID - 1]; |
| IdentifierData[ID - 1] = reinterpret_cast<uint64_t>( |
| &Context.Idents.get(IdentifierTable + Offset)); |
| } |
| |
| return reinterpret_cast<IdentifierInfo *>(IdentifierData[ID - 1]); |
| } |
| |
| DeclarationName |
| PCHReader::ReadDeclarationName(const RecordData &Record, unsigned &Idx) { |
| DeclarationName::NameKind Kind = (DeclarationName::NameKind)Record[Idx++]; |
| switch (Kind) { |
| case DeclarationName::Identifier: |
| return DeclarationName(GetIdentifierInfo(Record, Idx)); |
| |
| case DeclarationName::ObjCZeroArgSelector: |
| case DeclarationName::ObjCOneArgSelector: |
| case DeclarationName::ObjCMultiArgSelector: |
| assert(false && "Unable to de-serialize Objective-C selectors"); |
| break; |
| |
| case DeclarationName::CXXConstructorName: |
| return Context.DeclarationNames.getCXXConstructorName( |
| GetType(Record[Idx++])); |
| |
| case DeclarationName::CXXDestructorName: |
| return Context.DeclarationNames.getCXXDestructorName( |
| GetType(Record[Idx++])); |
| |
| case DeclarationName::CXXConversionFunctionName: |
| return Context.DeclarationNames.getCXXConversionFunctionName( |
| GetType(Record[Idx++])); |
| |
| case DeclarationName::CXXOperatorName: |
| return Context.DeclarationNames.getCXXOperatorName( |
| (OverloadedOperatorKind)Record[Idx++]); |
| |
| case DeclarationName::CXXUsingDirective: |
| return DeclarationName::getUsingDirectiveName(); |
| } |
| |
| // Required to silence GCC warning |
| return DeclarationName(); |
| } |
| |
| /// \brief Read an integral value |
| llvm::APInt PCHReader::ReadAPInt(const RecordData &Record, unsigned &Idx) { |
| unsigned BitWidth = Record[Idx++]; |
| unsigned NumWords = llvm::APInt::getNumWords(BitWidth); |
| llvm::APInt Result(BitWidth, NumWords, &Record[Idx]); |
| Idx += NumWords; |
| return Result; |
| } |
| |
| /// \brief Read a signed integral value |
| llvm::APSInt PCHReader::ReadAPSInt(const RecordData &Record, unsigned &Idx) { |
| bool isUnsigned = Record[Idx++]; |
| return llvm::APSInt(ReadAPInt(Record, Idx), isUnsigned); |
| } |
| |
| /// \brief Read a floating-point value |
| llvm::APFloat PCHReader::ReadAPFloat(const RecordData &Record, unsigned &Idx) { |
| // FIXME: is this really correct? |
| return llvm::APFloat(ReadAPInt(Record, Idx)); |
| } |
| |
| Expr *PCHReader::ReadExpr() { |
| // Within the bitstream, expressions are stored in Reverse Polish |
| // Notation, with each of the subexpressions preceding the |
| // expression they are stored in. To evaluate expressions, we |
| // continue reading expressions and placing them on the stack, with |
| // expressions having operands removing those operands from the |
| // stack. Evaluation terminates when we see a EXPR_STOP record, and |
| // the single remaining expression on the stack is our result. |
| RecordData Record; |
| unsigned Idx; |
| llvm::SmallVector<Expr *, 16> ExprStack; |
| PCHStmtReader Reader(*this, Record, Idx, ExprStack); |
| Stmt::EmptyShell Empty; |
| |
| while (true) { |
| unsigned Code = Stream.ReadCode(); |
| if (Code == llvm::bitc::END_BLOCK) { |
| if (Stream.ReadBlockEnd()) { |
| Error("Error at end of Source Manager block"); |
| return 0; |
| } |
| break; |
| } |
| |
| if (Code == llvm::bitc::ENTER_SUBBLOCK) { |
| // No known subblocks, always skip them. |
| Stream.ReadSubBlockID(); |
| if (Stream.SkipBlock()) { |
| Error("Malformed block record"); |
| return 0; |
| } |
| continue; |
| } |
| |
| if (Code == llvm::bitc::DEFINE_ABBREV) { |
| Stream.ReadAbbrevRecord(); |
| continue; |
| } |
| |
| Expr *E = 0; |
| Idx = 0; |
| Record.clear(); |
| bool Finished = false; |
| switch ((pch::StmtCode)Stream.ReadRecord(Code, Record)) { |
| case pch::EXPR_STOP: |
| Finished = true; |
| break; |
| |
| case pch::EXPR_NULL: |
| E = 0; |
| break; |
| |
| case pch::EXPR_PREDEFINED: |
| // FIXME: untested (until we can serialize function bodies). |
| E = new (Context) PredefinedExpr(Empty); |
| break; |
| |
| case pch::EXPR_DECL_REF: |
| E = new (Context) DeclRefExpr(Empty); |
| break; |
| |
| case pch::EXPR_INTEGER_LITERAL: |
| E = new (Context) IntegerLiteral(Empty); |
| break; |
| |
| case pch::EXPR_FLOATING_LITERAL: |
| E = new (Context) FloatingLiteral(Empty); |
| break; |
| |
| case pch::EXPR_CHARACTER_LITERAL: |
| E = new (Context) CharacterLiteral(Empty); |
| break; |
| |
| case pch::EXPR_PAREN: |
| E = new (Context) ParenExpr(Empty); |
| break; |
| |
| case pch::EXPR_UNARY_OPERATOR: |
| E = new (Context) UnaryOperator(Empty); |
| break; |
| |
| case pch::EXPR_SIZEOF_ALIGN_OF: |
| E = new (Context) SizeOfAlignOfExpr(Empty); |
| break; |
| |
| case pch::EXPR_BINARY_OPERATOR: |
| E = new (Context) BinaryOperator(Empty); |
| break; |
| |
| case pch::EXPR_IMPLICIT_CAST: |
| E = new (Context) ImplicitCastExpr(Empty); |
| break; |
| |
| case pch::EXPR_CSTYLE_CAST: |
| E = new (Context) CStyleCastExpr(Empty); |
| break; |
| } |
| |
| // We hit an EXPR_STOP, so we're done with this expression. |
| if (Finished) |
| break; |
| |
| if (E) { |
| unsigned NumSubExprs = Reader.Visit(E); |
| while (NumSubExprs > 0) { |
| ExprStack.pop_back(); |
| --NumSubExprs; |
| } |
| } |
| |
| assert(Idx == Record.size() && "Invalid deserialization of expression"); |
| ExprStack.push_back(E); |
| } |
| assert(ExprStack.size() == 1 && "Extra expressions on stack!"); |
| return ExprStack.back(); |
| } |
| |
| DiagnosticBuilder PCHReader::Diag(unsigned DiagID) { |
| return Diag(SourceLocation(), DiagID); |
| } |
| |
| DiagnosticBuilder PCHReader::Diag(SourceLocation Loc, unsigned DiagID) { |
| return PP.getDiagnostics().Report(FullSourceLoc(Loc, |
| Context.getSourceManager()), |
| DiagID); |
| } |