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llvm-project/clang/lib/Frontend/PCHWriter.cpp

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//===--- PCHWriter.h - Precompiled Headers Writer ---------------*- 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 PCHWriter class, which writes a precompiled header.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/PCHWriter.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclContextInternals.h"
#include "clang/AST/DeclVisitor.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/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/SourceManagerInternals.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cstdio>
using namespace clang;
//===----------------------------------------------------------------------===//
// Type serialization
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN PCHTypeWriter {
PCHWriter &Writer;
PCHWriter::RecordData &Record;
public:
/// \brief Type code that corresponds to the record generated.
pch::TypeCode Code;
PCHTypeWriter(PCHWriter &Writer, PCHWriter::RecordData &Record)
: Writer(Writer), Record(Record) { }
void VisitArrayType(const ArrayType *T);
void VisitFunctionType(const FunctionType *T);
void VisitTagType(const TagType *T);
#define TYPE(Class, Base) void Visit##Class##Type(const Class##Type *T);
#define ABSTRACT_TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base)
#include "clang/AST/TypeNodes.def"
};
}
void PCHTypeWriter::VisitExtQualType(const ExtQualType *T) {
Writer.AddTypeRef(QualType(T->getBaseType(), 0), Record);
Record.push_back(T->getObjCGCAttr()); // FIXME: use stable values
Record.push_back(T->getAddressSpace());
Code = pch::TYPE_EXT_QUAL;
}
void PCHTypeWriter::VisitBuiltinType(const BuiltinType *T) {
assert(false && "Built-in types are never serialized");
}
void PCHTypeWriter::VisitFixedWidthIntType(const FixedWidthIntType *T) {
Record.push_back(T->getWidth());
Record.push_back(T->isSigned());
Code = pch::TYPE_FIXED_WIDTH_INT;
}
void PCHTypeWriter::VisitComplexType(const ComplexType *T) {
Writer.AddTypeRef(T->getElementType(), Record);
Code = pch::TYPE_COMPLEX;
}
void PCHTypeWriter::VisitPointerType(const PointerType *T) {
Writer.AddTypeRef(T->getPointeeType(), Record);
Code = pch::TYPE_POINTER;
}
void PCHTypeWriter::VisitBlockPointerType(const BlockPointerType *T) {
Writer.AddTypeRef(T->getPointeeType(), Record);
Code = pch::TYPE_BLOCK_POINTER;
}
void PCHTypeWriter::VisitLValueReferenceType(const LValueReferenceType *T) {
Writer.AddTypeRef(T->getPointeeType(), Record);
Code = pch::TYPE_LVALUE_REFERENCE;
}
void PCHTypeWriter::VisitRValueReferenceType(const RValueReferenceType *T) {
Writer.AddTypeRef(T->getPointeeType(), Record);
Code = pch::TYPE_RVALUE_REFERENCE;
}
void PCHTypeWriter::VisitMemberPointerType(const MemberPointerType *T) {
Writer.AddTypeRef(T->getPointeeType(), Record);
Writer.AddTypeRef(QualType(T->getClass(), 0), Record);
Code = pch::TYPE_MEMBER_POINTER;
}
void PCHTypeWriter::VisitArrayType(const ArrayType *T) {
Writer.AddTypeRef(T->getElementType(), Record);
Record.push_back(T->getSizeModifier()); // FIXME: stable values
Record.push_back(T->getIndexTypeQualifier()); // FIXME: stable values
}
void PCHTypeWriter::VisitConstantArrayType(const ConstantArrayType *T) {
VisitArrayType(T);
Writer.AddAPInt(T->getSize(), Record);
Code = pch::TYPE_CONSTANT_ARRAY;
}
void PCHTypeWriter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
VisitArrayType(T);
Code = pch::TYPE_INCOMPLETE_ARRAY;
}
void PCHTypeWriter::VisitVariableArrayType(const VariableArrayType *T) {
VisitArrayType(T);
Writer.AddExpr(T->getSizeExpr());
Code = pch::TYPE_VARIABLE_ARRAY;
}
void PCHTypeWriter::VisitVectorType(const VectorType *T) {
Writer.AddTypeRef(T->getElementType(), Record);
Record.push_back(T->getNumElements());
Code = pch::TYPE_VECTOR;
}
void PCHTypeWriter::VisitExtVectorType(const ExtVectorType *T) {
VisitVectorType(T);
Code = pch::TYPE_EXT_VECTOR;
}
void PCHTypeWriter::VisitFunctionType(const FunctionType *T) {
Writer.AddTypeRef(T->getResultType(), Record);
}
void PCHTypeWriter::VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
VisitFunctionType(T);
Code = pch::TYPE_FUNCTION_NO_PROTO;
}
void PCHTypeWriter::VisitFunctionProtoType(const FunctionProtoType *T) {
VisitFunctionType(T);
Record.push_back(T->getNumArgs());
for (unsigned I = 0, N = T->getNumArgs(); I != N; ++I)
Writer.AddTypeRef(T->getArgType(I), Record);
Record.push_back(T->isVariadic());
Record.push_back(T->getTypeQuals());
Code = pch::TYPE_FUNCTION_PROTO;
}
void PCHTypeWriter::VisitTypedefType(const TypedefType *T) {
Writer.AddDeclRef(T->getDecl(), Record);
Code = pch::TYPE_TYPEDEF;
}
void PCHTypeWriter::VisitTypeOfExprType(const TypeOfExprType *T) {
Writer.AddExpr(T->getUnderlyingExpr());
Code = pch::TYPE_TYPEOF_EXPR;
}
void PCHTypeWriter::VisitTypeOfType(const TypeOfType *T) {
Writer.AddTypeRef(T->getUnderlyingType(), Record);
Code = pch::TYPE_TYPEOF;
}
void PCHTypeWriter::VisitTagType(const TagType *T) {
Writer.AddDeclRef(T->getDecl(), Record);
assert(!T->isBeingDefined() &&
"Cannot serialize in the middle of a type definition");
}
void PCHTypeWriter::VisitRecordType(const RecordType *T) {
VisitTagType(T);
Code = pch::TYPE_RECORD;
}
void PCHTypeWriter::VisitEnumType(const EnumType *T) {
VisitTagType(T);
Code = pch::TYPE_ENUM;
}
void
PCHTypeWriter::VisitTemplateSpecializationType(
const TemplateSpecializationType *T) {
// FIXME: Serialize this type
assert(false && "Cannot serialize template specialization types");
}
void PCHTypeWriter::VisitQualifiedNameType(const QualifiedNameType *T) {
// FIXME: Serialize this type
assert(false && "Cannot serialize qualified name types");
}
void PCHTypeWriter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
Writer.AddDeclRef(T->getDecl(), Record);
Code = pch::TYPE_OBJC_INTERFACE;
}
void
PCHTypeWriter::VisitObjCQualifiedInterfaceType(
const ObjCQualifiedInterfaceType *T) {
VisitObjCInterfaceType(T);
Record.push_back(T->getNumProtocols());
for (unsigned I = 0, N = T->getNumProtocols(); I != N; ++I)
Writer.AddDeclRef(T->getProtocol(I), Record);
Code = pch::TYPE_OBJC_QUALIFIED_INTERFACE;
}
void PCHTypeWriter::VisitObjCQualifiedIdType(const ObjCQualifiedIdType *T) {
Record.push_back(T->getNumProtocols());
for (unsigned I = 0, N = T->getNumProtocols(); I != N; ++I)
Writer.AddDeclRef(T->getProtocols(I), Record);
Code = pch::TYPE_OBJC_QUALIFIED_ID;
}
void
PCHTypeWriter::VisitObjCQualifiedClassType(const ObjCQualifiedClassType *T) {
Record.push_back(T->getNumProtocols());
for (unsigned I = 0, N = T->getNumProtocols(); I != N; ++I)
Writer.AddDeclRef(T->getProtocols(I), Record);
Code = pch::TYPE_OBJC_QUALIFIED_CLASS;
}
//===----------------------------------------------------------------------===//
// Declaration serialization
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN PCHDeclWriter
: public DeclVisitor<PCHDeclWriter, void> {
PCHWriter &Writer;
PCHWriter::RecordData &Record;
public:
pch::DeclCode Code;
PCHDeclWriter(PCHWriter &Writer, PCHWriter::RecordData &Record)
: Writer(Writer), 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 VisitFunctionDecl(FunctionDecl *D);
void VisitFieldDecl(FieldDecl *D);
void VisitVarDecl(VarDecl *D);
void VisitParmVarDecl(ParmVarDecl *D);
void VisitOriginalParmVarDecl(OriginalParmVarDecl *D);
void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
void VisitBlockDecl(BlockDecl *D);
void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
uint64_t VisibleOffset);
};
}
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());
// FIXME: hasAttrs
Record.push_back(D->isImplicit());
Record.push_back(D->getAccess());
}
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.AddTypeRef(D->getUnderlyingType(), Record);
Code = pch::DECL_TYPEDEF;
}
void PCHDeclWriter::VisitTagDecl(TagDecl *D) {
VisitTypeDecl(D);
Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
Record.push_back(D->isDefinition());
Writer.AddDeclRef(D->getTypedefForAnonDecl(), Record);
}
void PCHDeclWriter::VisitEnumDecl(EnumDecl *D) {
VisitTagDecl(D);
Writer.AddTypeRef(D->getIntegerType(), Record);
Code = pch::DECL_ENUM;
}
void PCHDeclWriter::VisitRecordDecl(RecordDecl *D) {
VisitTagDecl(D);
Record.push_back(D->hasFlexibleArrayMember());
Record.push_back(D->isAnonymousStructOrUnion());
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.AddExpr(D->getInitExpr());
Writer.AddAPSInt(D->getInitVal(), Record);
Code = pch::DECL_ENUM_CONSTANT;
}
void PCHDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
VisitValueDecl(D);
// FIXME: function body
Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
Record.push_back(D->getStorageClass()); // FIXME: stable encoding
Record.push_back(D->isInline());
Record.push_back(D->isVirtual());
Record.push_back(D->isPure());
Record.push_back(D->inheritedPrototype());
Record.push_back(D->hasPrototype() && !D->inheritedPrototype());
Record.push_back(D->isDeleted());
Writer.AddSourceLocation(D->getTypeSpecStartLoc(), Record);
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::VisitFieldDecl(FieldDecl *D) {
VisitValueDecl(D);
Record.push_back(D->isMutable());
Record.push_back(D->getBitWidth()? 1 : 0);
if (D->getBitWidth())
Writer.AddExpr(D->getBitWidth());
Code = pch::DECL_FIELD;
}
void PCHDeclWriter::VisitVarDecl(VarDecl *D) {
VisitValueDecl(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);
Writer.AddSourceLocation(D->getTypeSpecStartLoc(), Record);
Record.push_back(D->getInit()? 1 : 0);
if (D->getInit())
Writer.AddExpr(D->getInit());
Code = pch::DECL_VAR;
}
void PCHDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
VisitVarDecl(D);
Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
// FIXME: emit default argument
// FIXME: why isn't the "default argument" just stored as the initializer
// in VarDecl?
Code = pch::DECL_PARM_VAR;
}
void PCHDeclWriter::VisitOriginalParmVarDecl(OriginalParmVarDecl *D) {
VisitParmVarDecl(D);
Writer.AddTypeRef(D->getOriginalType(), Record);
Code = pch::DECL_ORIGINAL_PARM_VAR;
}
void PCHDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
VisitDecl(D);
// FIXME: Emit the string literal
Code = pch::DECL_FILE_SCOPE_ASM;
}
void PCHDeclWriter::VisitBlockDecl(BlockDecl *D) {
VisitDecl(D);
// FIXME: emit block body
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);
if (DC->getPrimaryContext() == DC)
Record.push_back(VisibleOffset);
}
//===----------------------------------------------------------------------===//
// Statement/expression serialization
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN PCHStmtWriter
: public StmtVisitor<PCHStmtWriter, void> {
PCHWriter &Writer;
PCHWriter::RecordData &Record;
public:
pch::StmtCode Code;
PCHStmtWriter(PCHWriter &Writer, PCHWriter::RecordData &Record)
: Writer(Writer), Record(Record) { }
void VisitExpr(Expr *E);
void VisitPredefinedExpr(PredefinedExpr *E);
void VisitDeclRefExpr(DeclRefExpr *E);
void VisitIntegerLiteral(IntegerLiteral *E);
void VisitFloatingLiteral(FloatingLiteral *E);
void VisitCharacterLiteral(CharacterLiteral *E);
};
}
void PCHStmtWriter::VisitExpr(Expr *E) {
Writer.AddTypeRef(E->getType(), Record);
Record.push_back(E->isTypeDependent());
Record.push_back(E->isValueDependent());
}
void PCHStmtWriter::VisitPredefinedExpr(PredefinedExpr *E) {
VisitExpr(E);
Writer.AddSourceLocation(E->getLocation(), Record);
Record.push_back(E->getIdentType()); // FIXME: stable encoding
Code = pch::EXPR_PREDEFINED;
}
void PCHStmtWriter::VisitDeclRefExpr(DeclRefExpr *E) {
VisitExpr(E);
Writer.AddDeclRef(E->getDecl(), Record);
Writer.AddSourceLocation(E->getLocation(), Record);
Code = pch::EXPR_DECL_REF;
}
void PCHStmtWriter::VisitIntegerLiteral(IntegerLiteral *E) {
VisitExpr(E);
Writer.AddSourceLocation(E->getLocation(), Record);
Writer.AddAPInt(E->getValue(), Record);
Code = pch::EXPR_INTEGER_LITERAL;
}
void PCHStmtWriter::VisitFloatingLiteral(FloatingLiteral *E) {
VisitExpr(E);
Writer.AddAPFloat(E->getValue(), Record);
Record.push_back(E->isExact());
Writer.AddSourceLocation(E->getLocation(), Record);
Code = pch::EXPR_FLOATING_LITERAL;
}
void PCHStmtWriter::VisitCharacterLiteral(CharacterLiteral *E) {
VisitExpr(E);
Record.push_back(E->getValue());
Writer.AddSourceLocation(E->getLoc(), Record);
Record.push_back(E->isWide());
Code = pch::EXPR_CHARACTER_LITERAL;
}
//===----------------------------------------------------------------------===//
// PCHWriter Implementation
//===----------------------------------------------------------------------===//
/// \brief Write the target triple (e.g., i686-apple-darwin9).
void PCHWriter::WriteTargetTriple(const TargetInfo &Target) {
using namespace llvm;
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::TARGET_TRIPLE));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Triple name
unsigned TripleAbbrev = S.EmitAbbrev(Abbrev);
RecordData Record;
Record.push_back(pch::TARGET_TRIPLE);
const char *Triple = Target.getTargetTriple();
S.EmitRecordWithBlob(TripleAbbrev, Record, Triple, strlen(Triple));
}
/// \brief Write the LangOptions structure.
void PCHWriter::WriteLanguageOptions(const LangOptions &LangOpts) {
RecordData Record;
Record.push_back(LangOpts.Trigraphs);
Record.push_back(LangOpts.BCPLComment); // BCPL-style '//' comments.
Record.push_back(LangOpts.DollarIdents); // '$' allowed in identifiers.
Record.push_back(LangOpts.AsmPreprocessor); // Preprocessor in asm mode.
Record.push_back(LangOpts.GNUMode); // True in gnu99 mode false in c99 mode (etc)
Record.push_back(LangOpts.ImplicitInt); // C89 implicit 'int'.
Record.push_back(LangOpts.Digraphs); // C94, C99 and C++
Record.push_back(LangOpts.HexFloats); // C99 Hexadecimal float constants.
Record.push_back(LangOpts.C99); // C99 Support
Record.push_back(LangOpts.Microsoft); // Microsoft extensions.
Record.push_back(LangOpts.CPlusPlus); // C++ Support
Record.push_back(LangOpts.CPlusPlus0x); // C++0x Support
Record.push_back(LangOpts.NoExtensions); // All extensions are disabled, strict mode.
Record.push_back(LangOpts.CXXOperatorNames); // Treat C++ operator names as keywords.
Record.push_back(LangOpts.ObjC1); // Objective-C 1 support enabled.
Record.push_back(LangOpts.ObjC2); // Objective-C 2 support enabled.
Record.push_back(LangOpts.ObjCNonFragileABI); // Objective-C modern abi enabled
Record.push_back(LangOpts.PascalStrings); // Allow Pascal strings
Record.push_back(LangOpts.Boolean); // Allow bool/true/false
Record.push_back(LangOpts.WritableStrings); // Allow writable strings
Record.push_back(LangOpts.LaxVectorConversions);
Record.push_back(LangOpts.Exceptions); // Support exception handling.
Record.push_back(LangOpts.NeXTRuntime); // Use NeXT runtime.
Record.push_back(LangOpts.Freestanding); // Freestanding implementation
Record.push_back(LangOpts.NoBuiltin); // Do not use builtin functions (-fno-builtin)
Record.push_back(LangOpts.ThreadsafeStatics); // Whether static initializers are protected
// by locks.
Record.push_back(LangOpts.Blocks); // block extension to C
Record.push_back(LangOpts.EmitAllDecls); // Emit all declarations, even if
// they are unused.
Record.push_back(LangOpts.MathErrno); // Math functions must respect errno
// (modulo the platform support).
Record.push_back(LangOpts.OverflowChecking); // Extension to call a handler function when
// signed integer arithmetic overflows.
Record.push_back(LangOpts.HeinousExtensions); // Extensions that we really don't like and
// may be ripped out at any time.
Record.push_back(LangOpts.Optimize); // Whether __OPTIMIZE__ should be defined.
Record.push_back(LangOpts.OptimizeSize); // Whether __OPTIMIZE_SIZE__ should be
// defined.
Record.push_back(LangOpts.Static); // Should __STATIC__ be defined (as
// opposed to __DYNAMIC__).
Record.push_back(LangOpts.PICLevel); // The value for __PIC__, if non-zero.
Record.push_back(LangOpts.GNUInline); // Should GNU inline semantics be
// used (instead of C99 semantics).
Record.push_back(LangOpts.NoInline); // Should __NO_INLINE__ be defined.
Record.push_back(LangOpts.getGCMode());
Record.push_back(LangOpts.getVisibilityMode());
Record.push_back(LangOpts.InstantiationDepth);
S.EmitRecord(pch::LANGUAGE_OPTIONS, Record);
}
//===----------------------------------------------------------------------===//
// Source Manager Serialization
//===----------------------------------------------------------------------===//
/// \brief Create an abbreviation for the SLocEntry that refers to a
/// file.
static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &S) {
using namespace llvm;
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::SM_SLOC_FILE_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
return S.EmitAbbrev(Abbrev);
}
/// \brief Create an abbreviation for the SLocEntry that refers to a
/// buffer.
static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &S) {
using namespace llvm;
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::SM_SLOC_BUFFER_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
return S.EmitAbbrev(Abbrev);
}
/// \brief Create an abbreviation for the SLocEntry that refers to a
/// buffer's blob.
static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &S) {
using namespace llvm;
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::SM_SLOC_BUFFER_BLOB));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
return S.EmitAbbrev(Abbrev);
}
/// \brief Create an abbreviation for the SLocEntry that refers to an
/// buffer.
static unsigned CreateSLocInstantiationAbbrev(llvm::BitstreamWriter &S) {
using namespace llvm;
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::SM_SLOC_INSTANTIATION_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Start location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // End location
return S.EmitAbbrev(Abbrev);
}
/// \brief Writes the block containing the serialized form of the
/// source manager.
///
/// TODO: We should probably use an on-disk hash table (stored in a
/// blob), indexed based on the file name, so that we only create
/// entries for files that we actually need. In the common case (no
/// errors), we probably won't have to create file entries for any of
/// the files in the AST.
void PCHWriter::WriteSourceManagerBlock(SourceManager &SourceMgr) {
// Enter the source manager block.
S.EnterSubblock(pch::SOURCE_MANAGER_BLOCK_ID, 3);
// Abbreviations for the various kinds of source-location entries.
int SLocFileAbbrv = -1;
int SLocBufferAbbrv = -1;
int SLocBufferBlobAbbrv = -1;
int SLocInstantiationAbbrv = -1;
// Write out the source location entry table. We skip the first
// entry, which is always the same dummy entry.
RecordData Record;
for (SourceManager::sloc_entry_iterator
SLoc = SourceMgr.sloc_entry_begin() + 1,
SLocEnd = SourceMgr.sloc_entry_end();
SLoc != SLocEnd; ++SLoc) {
// Figure out which record code to use.
unsigned Code;
if (SLoc->isFile()) {
if (SLoc->getFile().getContentCache()->Entry)
Code = pch::SM_SLOC_FILE_ENTRY;
else
Code = pch::SM_SLOC_BUFFER_ENTRY;
} else
Code = pch::SM_SLOC_INSTANTIATION_ENTRY;
Record.push_back(Code);
Record.push_back(SLoc->getOffset());
if (SLoc->isFile()) {
const SrcMgr::FileInfo &File = SLoc->getFile();
Record.push_back(File.getIncludeLoc().getRawEncoding());
Record.push_back(File.getFileCharacteristic()); // FIXME: stable encoding
Record.push_back(File.hasLineDirectives());
const SrcMgr::ContentCache *Content = File.getContentCache();
if (Content->Entry) {
// The source location entry is a file. The blob associated
// with this entry is the file name.
if (SLocFileAbbrv == -1)
SLocFileAbbrv = CreateSLocFileAbbrev(S);
S.EmitRecordWithBlob(SLocFileAbbrv, Record,
Content->Entry->getName(),
strlen(Content->Entry->getName()));
} else {
// The source location entry is a buffer. The blob associated
// with this entry contains the contents of the buffer.
if (SLocBufferAbbrv == -1) {
SLocBufferAbbrv = CreateSLocBufferAbbrev(S);
SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(S);
}
// We add one to the size so that we capture the trailing NULL
// that is required by llvm::MemoryBuffer::getMemBuffer (on
// the reader side).
const llvm::MemoryBuffer *Buffer = Content->getBuffer();
const char *Name = Buffer->getBufferIdentifier();
S.EmitRecordWithBlob(SLocBufferAbbrv, Record, Name, strlen(Name) + 1);
Record.clear();
Record.push_back(pch::SM_SLOC_BUFFER_BLOB);
S.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record,
Buffer->getBufferStart(),
Buffer->getBufferSize() + 1);
}
} else {
// The source location entry is an instantiation.
const SrcMgr::InstantiationInfo &Inst = SLoc->getInstantiation();
Record.push_back(Inst.getSpellingLoc().getRawEncoding());
Record.push_back(Inst.getInstantiationLocStart().getRawEncoding());
Record.push_back(Inst.getInstantiationLocEnd().getRawEncoding());
if (SLocInstantiationAbbrv == -1)
SLocInstantiationAbbrv = CreateSLocInstantiationAbbrev(S);
S.EmitRecordWithAbbrev(SLocInstantiationAbbrv, Record);
}
Record.clear();
}
// Write the line table.
if (SourceMgr.hasLineTable()) {
LineTableInfo &LineTable = SourceMgr.getLineTable();
// Emit the file names
Record.push_back(LineTable.getNumFilenames());
for (unsigned I = 0, N = LineTable.getNumFilenames(); I != N; ++I) {
// Emit the file name
const char *Filename = LineTable.getFilename(I);
unsigned FilenameLen = Filename? strlen(Filename) : 0;
Record.push_back(FilenameLen);
if (FilenameLen)
Record.insert(Record.end(), Filename, Filename + FilenameLen);
}
// Emit the line entries
for (LineTableInfo::iterator L = LineTable.begin(), LEnd = LineTable.end();
L != LEnd; ++L) {
// Emit the file ID
Record.push_back(L->first);
// Emit the line entries
Record.push_back(L->second.size());
for (std::vector<LineEntry>::iterator LE = L->second.begin(),
LEEnd = L->second.end();
LE != LEEnd; ++LE) {
Record.push_back(LE->FileOffset);
Record.push_back(LE->LineNo);
Record.push_back(LE->FilenameID);
Record.push_back((unsigned)LE->FileKind);
Record.push_back(LE->IncludeOffset);
}
S.EmitRecord(pch::SM_LINE_TABLE, Record);
}
}
S.ExitBlock();
}
/// \brief Writes the block containing the serialized form of the
/// preprocessor.
///
void PCHWriter::WritePreprocessor(const Preprocessor &PP) {
// Enter the preprocessor block.
S.EnterSubblock(pch::PREPROCESSOR_BLOCK_ID, 3);
// If the PCH file contains __DATE__ or __TIME__ emit a warning about this.
// FIXME: use diagnostics subsystem for localization etc.
if (PP.SawDateOrTime())
fprintf(stderr, "warning: precompiled header used __DATE__ or __TIME__.\n");
RecordData Record;
// If the preprocessor __COUNTER__ value has been bumped, remember it.
if (PP.getCounterValue() != 0) {
Record.push_back(PP.getCounterValue());
S.EmitRecord(pch::PP_COUNTER_VALUE, Record);
Record.clear();
}
// Loop over all the macro definitions that are live at the end of the file,
// emitting each to the PP section.
// FIXME: Eventually we want to emit an index so that we can lazily load
// macros.
for (Preprocessor::macro_iterator I = PP.macro_begin(), E = PP.macro_end();
I != E; ++I) {
// FIXME: This emits macros in hash table order, we should do it in a stable
// order so that output is reproducible.
MacroInfo *MI = I->second;
// Don't emit builtin macros like __LINE__ to the PCH file unless they have
// been redefined by the header (in which case they are not isBuiltinMacro).
if (MI->isBuiltinMacro())
continue;
AddIdentifierRef(I->first, Record);
Record.push_back(MI->getDefinitionLoc().getRawEncoding());
Record.push_back(MI->isUsed());
unsigned Code;
if (MI->isObjectLike()) {
Code = pch::PP_MACRO_OBJECT_LIKE;
} else {
Code = pch::PP_MACRO_FUNCTION_LIKE;
Record.push_back(MI->isC99Varargs());
Record.push_back(MI->isGNUVarargs());
Record.push_back(MI->getNumArgs());
for (MacroInfo::arg_iterator I = MI->arg_begin(), E = MI->arg_end();
I != E; ++I)
AddIdentifierRef(*I, Record);
}
S.EmitRecord(Code, Record);
Record.clear();
// Emit the tokens array.
for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
// Note that we know that the preprocessor does not have any annotation
// tokens in it because they are created by the parser, and thus can't be
// in a macro definition.
const Token &Tok = MI->getReplacementToken(TokNo);
Record.push_back(Tok.getLocation().getRawEncoding());
Record.push_back(Tok.getLength());
// FIXME: When reading literal tokens, reconstruct the literal pointer if
// it is needed.
AddIdentifierRef(Tok.getIdentifierInfo(), Record);
// FIXME: Should translate token kind to a stable encoding.
Record.push_back(Tok.getKind());
// FIXME: Should translate token flags to a stable encoding.
Record.push_back(Tok.getFlags());
S.EmitRecord(pch::PP_TOKEN, Record);
Record.clear();
}
}
S.ExitBlock();
}
/// \brief Write the representation of a type to the PCH stream.
void PCHWriter::WriteType(const Type *T) {
pch::TypeID &ID = TypeIDs[T];
if (ID == 0) // we haven't seen this type before.
ID = NextTypeID++;
// Record the offset for this type.
if (TypeOffsets.size() == ID - pch::NUM_PREDEF_TYPE_IDS)
TypeOffsets.push_back(S.GetCurrentBitNo());
else if (TypeOffsets.size() < ID - pch::NUM_PREDEF_TYPE_IDS) {
TypeOffsets.resize(ID + 1 - pch::NUM_PREDEF_TYPE_IDS);
TypeOffsets[ID - pch::NUM_PREDEF_TYPE_IDS] = S.GetCurrentBitNo();
}
RecordData Record;
// Emit the type's representation.
PCHTypeWriter W(*this, Record);
switch (T->getTypeClass()) {
// For all of the concrete, non-dependent types, call the
// appropriate visitor function.
#define TYPE(Class, Base) \
case Type::Class: W.Visit##Class##Type(cast<Class##Type>(T)); break;
#define ABSTRACT_TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base)
#include "clang/AST/TypeNodes.def"
// For all of the dependent type nodes (which only occur in C++
// templates), produce an error.
#define TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base) case Type::Class:
#include "clang/AST/TypeNodes.def"
assert(false && "Cannot serialize dependent type nodes");
break;
}
// Emit the serialized record.
S.EmitRecord(W.Code, Record);
// Flush any expressions that were written as part of this type.
FlushExprs();
}
/// \brief Write a block containing all of the types.
void PCHWriter::WriteTypesBlock(ASTContext &Context) {
// Enter the types block.
S.EnterSubblock(pch::TYPES_BLOCK_ID, 2);
// Emit all of the types in the ASTContext
for (std::vector<Type*>::const_iterator T = Context.getTypes().begin(),
TEnd = Context.getTypes().end();
T != TEnd; ++T) {
// Builtin types are never serialized.
if (isa<BuiltinType>(*T))
continue;
WriteType(*T);
}
// Exit the types block
S.ExitBlock();
}
/// \brief Write the block containing all of the declaration IDs
/// lexically declared within the given DeclContext.
///
/// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
/// bistream, or 0 if no block was written.
uint64_t PCHWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
DeclContext *DC) {
if (DC->decls_empty(Context))
return 0;
uint64_t Offset = S.GetCurrentBitNo();
RecordData Record;
for (DeclContext::decl_iterator D = DC->decls_begin(Context),
DEnd = DC->decls_end(Context);
D != DEnd; ++D)
AddDeclRef(*D, Record);
S.EmitRecord(pch::DECL_CONTEXT_LEXICAL, Record);
return Offset;
}
/// \brief Write the block containing all of the declaration IDs
/// visible from the given DeclContext.
///
/// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
/// bistream, or 0 if no block was written.
uint64_t PCHWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
DeclContext *DC) {
if (DC->getPrimaryContext() != DC)
return 0;
// Force the DeclContext to build a its name-lookup table.
DC->lookup(Context, DeclarationName());
// Serialize the contents of the mapping used for lookup. Note that,
// although we have two very different code paths, the serialized
// representation is the same for both cases: a declaration name,
// followed by a size, followed by references to the visible
// declarations that have that name.
uint64_t Offset = S.GetCurrentBitNo();
RecordData Record;
StoredDeclsMap *Map = static_cast<StoredDeclsMap*>(DC->getLookupPtr());
if (!Map)
return 0;
for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
D != DEnd; ++D) {
AddDeclarationName(D->first, Record);
DeclContext::lookup_result Result = D->second.getLookupResult(Context);
Record.push_back(Result.second - Result.first);
for(; Result.first != Result.second; ++Result.first)
AddDeclRef(*Result.first, Record);
}
if (Record.size() == 0)
return 0;
S.EmitRecord(pch::DECL_CONTEXT_VISIBLE, Record);
return Offset;
}
/// \brief Write a block containing all of the declarations.
void PCHWriter::WriteDeclsBlock(ASTContext &Context) {
// Enter the declarations block.
S.EnterSubblock(pch::DECLS_BLOCK_ID, 2);
// Emit all of the declarations.
RecordData Record;
PCHDeclWriter W(*this, Record);
while (!DeclsToEmit.empty()) {
// Pull the next declaration off the queue
Decl *D = DeclsToEmit.front();
DeclsToEmit.pop();
// 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(S.GetCurrentBitNo());
else if (DeclOffsets.size() < Index) {
DeclOffsets.resize(Index+1);
DeclOffsets[Index] = S.GetCurrentBitNo();
}
// Build and emit a record for this declaration
Record.clear();
W.Code = (pch::DeclCode)0;
W.Visit(D);
if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
assert(W.Code && "Unhandled declaration kind while generating PCH");
S.EmitRecord(W.Code, Record);
// Flush any expressions that were written as part of this declaration.
FlushExprs();
// Note external declarations so that we can add them to a record
// in the PCH file later.
if (isa<FileScopeAsmDecl>(D))
ExternalDefinitions.push_back(ID);
else if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
if (// Non-static file-scope variables with initializers or that
// are tentative definitions.
(Var->isFileVarDecl() &&
(Var->getInit() || Var->getStorageClass() == VarDecl::None)) ||
// Out-of-line definitions of static data members (C++).
(Var->getDeclContext()->isRecord() &&
!Var->getLexicalDeclContext()->isRecord() &&
Var->getStorageClass() == VarDecl::Static))
ExternalDefinitions.push_back(ID);
} else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D)) {
if (Func->isThisDeclarationADefinition() &&
Func->getStorageClass() != FunctionDecl::Static &&
!Func->isInline())
ExternalDefinitions.push_back(ID);
}
}
// Exit the declarations block
S.ExitBlock();
}
/// \brief Write the identifier table into the PCH file.
///
/// The identifier table consists of a blob containing string data
/// (the actual identifiers themselves) and a separate "offsets" index
/// that maps identifier IDs to locations within the blob.
void PCHWriter::WriteIdentifierTable() {
using namespace llvm;
// Create and write out the blob that contains the identifier
// strings.
RecordData IdentOffsets;
IdentOffsets.resize(IdentifierIDs.size());
{
// Create the identifier string data.
std::vector<char> Data;
Data.push_back(0); // Data must not be empty.
for (llvm::DenseMap<const IdentifierInfo *, pch::IdentID>::iterator
ID = IdentifierIDs.begin(), IDEnd = IdentifierIDs.end();
ID != IDEnd; ++ID) {
assert(ID->first && "NULL identifier in identifier table");
// Make sure we're starting on an odd byte. The PCH reader
// expects the low bit to be set on all of the offsets.
if ((Data.size() & 0x01) == 0)
Data.push_back((char)0);
IdentOffsets[ID->second - 1] = Data.size();
Data.insert(Data.end(),
ID->first->getName(),
ID->first->getName() + ID->first->getLength());
Data.push_back((char)0);
}
// Create a blob abbreviation
BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
Abbrev->Add(BitCodeAbbrevOp(pch::IDENTIFIER_TABLE));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Triple name
unsigned IDTableAbbrev = S.EmitAbbrev(Abbrev);
// Write the identifier table
RecordData Record;
Record.push_back(pch::IDENTIFIER_TABLE);
S.EmitRecordWithBlob(IDTableAbbrev, Record, &Data.front(), Data.size());
}
// Write the offsets table for identifier IDs.
S.EmitRecord(pch::IDENTIFIER_OFFSET, IdentOffsets);
}
PCHWriter::PCHWriter(llvm::BitstreamWriter &S)
: S(S), NextTypeID(pch::NUM_PREDEF_TYPE_IDS) { }
void PCHWriter::WritePCH(ASTContext &Context, const Preprocessor &PP) {
// Emit the file header.
S.Emit((unsigned)'C', 8);
S.Emit((unsigned)'P', 8);
S.Emit((unsigned)'C', 8);
S.Emit((unsigned)'H', 8);
// The translation unit is the first declaration we'll emit.
DeclIDs[Context.getTranslationUnitDecl()] = 1;
DeclsToEmit.push(Context.getTranslationUnitDecl());
// Write the remaining PCH contents.
S.EnterSubblock(pch::PCH_BLOCK_ID, 3);
WriteTargetTriple(Context.Target);
WriteLanguageOptions(Context.getLangOptions());
WriteSourceManagerBlock(Context.getSourceManager());
WritePreprocessor(PP);
WriteTypesBlock(Context);
WriteDeclsBlock(Context);
WriteIdentifierTable();
S.EmitRecord(pch::TYPE_OFFSET, TypeOffsets);
S.EmitRecord(pch::DECL_OFFSET, DeclOffsets);
if (!ExternalDefinitions.empty())
S.EmitRecord(pch::EXTERNAL_DEFINITIONS, ExternalDefinitions);
S.ExitBlock();
}
void PCHWriter::AddSourceLocation(SourceLocation Loc, RecordData &Record) {
Record.push_back(Loc.getRawEncoding());
}
void PCHWriter::AddAPInt(const llvm::APInt &Value, RecordData &Record) {
Record.push_back(Value.getBitWidth());
unsigned N = Value.getNumWords();
const uint64_t* Words = Value.getRawData();
for (unsigned I = 0; I != N; ++I)
Record.push_back(Words[I]);
}
void PCHWriter::AddAPSInt(const llvm::APSInt &Value, RecordData &Record) {
Record.push_back(Value.isUnsigned());
AddAPInt(Value, Record);
}
void PCHWriter::AddAPFloat(const llvm::APFloat &Value, RecordData &Record) {
AddAPInt(Value.bitcastToAPInt(), Record);
}
void PCHWriter::AddIdentifierRef(const IdentifierInfo *II, RecordData &Record) {
if (II == 0) {
Record.push_back(0);
return;
}
pch::IdentID &ID = IdentifierIDs[II];
if (ID == 0)
ID = IdentifierIDs.size();
Record.push_back(ID);
}
void PCHWriter::AddTypeRef(QualType T, RecordData &Record) {
if (T.isNull()) {
Record.push_back(pch::PREDEF_TYPE_NULL_ID);
return;
}
if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr())) {
pch::TypeID ID = 0;
switch (BT->getKind()) {
case BuiltinType::Void: ID = pch::PREDEF_TYPE_VOID_ID; break;
case BuiltinType::Bool: ID = pch::PREDEF_TYPE_BOOL_ID; break;
case BuiltinType::Char_U: ID = pch::PREDEF_TYPE_CHAR_U_ID; break;
case BuiltinType::UChar: ID = pch::PREDEF_TYPE_UCHAR_ID; break;
case BuiltinType::UShort: ID = pch::PREDEF_TYPE_USHORT_ID; break;
case BuiltinType::UInt: ID = pch::PREDEF_TYPE_UINT_ID; break;
case BuiltinType::ULong: ID = pch::PREDEF_TYPE_ULONG_ID; break;
case BuiltinType::ULongLong: ID = pch::PREDEF_TYPE_ULONGLONG_ID; break;
case BuiltinType::Char_S: ID = pch::PREDEF_TYPE_CHAR_S_ID; break;
case BuiltinType::SChar: ID = pch::PREDEF_TYPE_SCHAR_ID; break;
case BuiltinType::WChar: ID = pch::PREDEF_TYPE_WCHAR_ID; break;
case BuiltinType::Short: ID = pch::PREDEF_TYPE_SHORT_ID; break;
case BuiltinType::Int: ID = pch::PREDEF_TYPE_INT_ID; break;
case BuiltinType::Long: ID = pch::PREDEF_TYPE_LONG_ID; break;
case BuiltinType::LongLong: ID = pch::PREDEF_TYPE_LONGLONG_ID; break;
case BuiltinType::Float: ID = pch::PREDEF_TYPE_FLOAT_ID; break;
case BuiltinType::Double: ID = pch::PREDEF_TYPE_DOUBLE_ID; break;
case BuiltinType::LongDouble: ID = pch::PREDEF_TYPE_LONGDOUBLE_ID; break;
case BuiltinType::Overload: ID = pch::PREDEF_TYPE_OVERLOAD_ID; break;
case BuiltinType::Dependent: ID = pch::PREDEF_TYPE_DEPENDENT_ID; break;
}
Record.push_back((ID << 3) | T.getCVRQualifiers());
return;
}
pch::TypeID &ID = TypeIDs[T.getTypePtr()];
if (ID == 0) // we haven't seen this type before
ID = NextTypeID++;
// Encode the type qualifiers in the type reference.
Record.push_back((ID << 3) | T.getCVRQualifiers());
}
void PCHWriter::AddDeclRef(const Decl *D, RecordData &Record) {
if (D == 0) {
Record.push_back(0);
return;
}
pch::DeclID &ID = DeclIDs[D];
if (ID == 0) {
// We haven't seen this declaration before. Give it a new ID and
// enqueue it in the list of declarations to emit.
ID = DeclIDs.size();
DeclsToEmit.push(const_cast<Decl *>(D));
}
Record.push_back(ID);
}
void PCHWriter::AddDeclarationName(DeclarationName Name, RecordData &Record) {
Record.push_back(Name.getNameKind());
switch (Name.getNameKind()) {
case DeclarationName::Identifier:
AddIdentifierRef(Name.getAsIdentifierInfo(), Record);
break;
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
assert(false && "Serialization of Objective-C selectors unavailable");
break;
case DeclarationName::CXXConstructorName:
case DeclarationName::CXXDestructorName:
case DeclarationName::CXXConversionFunctionName:
AddTypeRef(Name.getCXXNameType(), Record);
break;
case DeclarationName::CXXOperatorName:
Record.push_back(Name.getCXXOverloadedOperator());
break;
case DeclarationName::CXXUsingDirective:
// No extra data to emit
break;
}
}
/// \brief Flush all of the expressions that have been added to the
/// queue via AddExpr().
void PCHWriter::FlushExprs() {
RecordData Record;
PCHStmtWriter Writer(*this, Record);
while (!ExprsToEmit.empty()) {
Expr *E = ExprsToEmit.front();
ExprsToEmit.pop();
Record.clear();
if (!E) {
S.EmitRecord(pch::EXPR_NULL, Record);
continue;
}
Writer.Code = pch::EXPR_NULL;
Writer.Visit(E);
assert(Writer.Code != pch::EXPR_NULL &&
"Unhandled expression writing PCH file");
S.EmitRecord(Writer.Code, Record);
}
}
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