void Error(const char *Msg);
};
-/// \brief Reads a precompiled head containing the contents of a
+/// \brief Reads a precompiled header chain containing the contents of a
/// translation unit.
///
-/// The PCHReader class reads a bitstream (produced by the PCHWriter
+/// The PCHReader class reads bitstreams (produced by the PCHWriter
/// class) containing the serialized representation of a given
/// abstract syntax tree and its supporting data structures. An
/// instance of the PCHReader can be attached to an ASTContext object,
-/// which will provide access to the contents of the PCH file.
+/// which will provide access to the contents of the PCH files.
///
/// The PCH reader provides lazy de-serialization of declarations, as
/// required when traversing the AST. Only those AST nodes that are
Diagnostic &Diags;
/// \brief The semantic analysis object that will be processing the
- /// PCH file and the translation unit that uses it.
+ /// PCH files and the translation unit that uses it.
Sema *SemaObj;
/// \brief The preprocessor that will be loading the source file.
Preprocessor *PP;
- /// \brief The AST context into which we'll read the PCH file.
+ /// \brief The AST context into which we'll read the PCH files.
ASTContext *Context;
-
- /// \brief The PCH stat cache installed by this PCHReader, if any.
- ///
- /// The dynamic type of this stat cache is always PCHStatCache
- void *StatCache;
/// \brief The AST consumer.
ASTConsumer *Consumer;
- /// \brief The bitstream reader from which we'll read the PCH file.
- llvm::BitstreamReader StreamFile;
- llvm::BitstreamCursor Stream;
+ /// \brief Information that is needed for every file in the chain.
+ struct PerFileData {
+ PerFileData();
+
+ /// \brief The PCH stat cache installed for this file, if any.
+ ///
+ /// The dynamic type of this stat cache is always PCHStatCache
+ void *StatCache;
- /// \brief The cursor to the start of the preprocessor block, which stores
- /// all of the macro definitions.
- llvm::BitstreamCursor MacroCursor;
+ /// \brief The bitstream reader from which we'll read the PCH file.
+ llvm::BitstreamReader StreamFile;
+ llvm::BitstreamCursor Stream;
+
+ /// \brief The cursor to the start of the preprocessor block, which stores
+ /// all of the macro definitions.
+ llvm::BitstreamCursor MacroCursor;
- /// DeclsCursor - This is a cursor to the start of the DECLS_BLOCK block. It
- /// has read all the abbreviations at the start of the block and is ready to
- /// jump around with these in context.
- llvm::BitstreamCursor DeclsCursor;
+ /// DeclsCursor - This is a cursor to the start of the DECLS_BLOCK block. It
+ /// has read all the abbreviations at the start of the block and is ready to
+ /// jump around with these in context.
+ llvm::BitstreamCursor DeclsCursor;
- /// \brief The file name of the PCH file.
- std::string FileName;
+ /// \brief The file name of the PCH file.
+ std::string FileName;
- /// \brief The memory buffer that stores the data associated with
- /// this PCH file.
- llvm::OwningPtr<llvm::MemoryBuffer> Buffer;
+ /// \brief The memory buffer that stores the data associated with
+ /// this PCH file.
+ llvm::OwningPtr<llvm::MemoryBuffer> Buffer;
- /// \brief Offset type for all of the source location entries in the
- /// PCH file.
+ /// \brief Cursor used to read source location entries.
+ llvm::BitstreamCursor SLocEntryCursor;
+
+ /// \brief The number of source location entries in this PCH file.
+ unsigned LocalNumSLocEntries;
+
+ /// \brief The number of types in this PCH file.
+ unsigned LocalNumTypes;
+
+ /// \brief The number of declarations in this PCH file.
+ unsigned LocalNumDecls;
+ };
+
+ /// \brief The chain of PCH files. The first entry is the one named by the
+ /// user, the last one is the one that doesn't depend on anything further.
+ llvm::SmallVector<PerFileData*, 2> Chain;
+
+ /// \brief Offsets for all of the source location entries in the
+ /// PCH files. The offsets are relative to a particular file; the correct
+ /// file is chosen using their IDs.
const uint32_t *SLocOffsets;
- /// \brief The number of source location entries in the PCH file.
+ /// \brief The number of source location entries in all PCH files.
unsigned TotalNumSLocEntries;
- /// \brief Cursor used to read source location entries.
- llvm::BitstreamCursor SLocEntryCursor;
-
/// \brief Offset of each type within the bitstream, indexed by the
- /// type ID, or the representation of a Type*.
+ /// type ID, or the representation of a Type*. The offset is local to the
+ /// containing file; the file is chosen using the ID.
const uint32_t *TypeOffsets;
/// \brief Types that have already been loaded from the PCH file.
///
/// When the pointer at index I is non-NULL, the type with
- /// ID = (I + 1) << 3 has already been loaded from the PCH file.
+ /// ID = (I + 1) << FastQual::Width has already been loaded from the PCH chain
std::vector<QualType> TypesLoaded;
/// \brief Offset of each declaration within the bitstream, indexed
- /// by the declaration ID (-1).
+ /// by the declaration ID (-1). The offset is local to the containing file;
+ /// the file is chosen using the ID.
const uint32_t *DeclOffsets;
/// \brief Declarations that have already been loaded from the PCH file.
/// \brief Sets and initializes the given Context.
void InitializeContext(ASTContext &Context);
- /// \brief Retrieve the name of the PCH file
- const std::string &getFileName() const { return FileName; }
+ /// \brief Retrieve the name of the named (primary) PCH file
+ const std::string &getFileName() const { return Chain[0]->FileName; }
/// \brief Retrieve the name of the original source file name
const std::string &getOriginalSourceFile() { return OriginalFileName; }
Sema *getSema() { return SemaObj; }
/// \brief Retrieve the stream that this PCH reader is reading from.
- llvm::BitstreamCursor &getStream() { return Stream; }
- llvm::BitstreamCursor &getDeclsCursor() { return DeclsCursor; }
+ llvm::BitstreamCursor &getStream() { return Chain[0]->Stream; }
+ llvm::BitstreamCursor &getDeclsCursor() { return Chain[0]->DeclsCursor; }
/// \brief Retrieve the identifier table associated with the
/// preprocessor.
: Listener(new PCHValidator(PP, *this)), DeserializationListener(0),
SourceMgr(PP.getSourceManager()), FileMgr(PP.getFileManager()),
Diags(PP.getDiagnostics()), SemaObj(0), PP(&PP), Context(Context),
- StatCache(0), Consumer(0), IdentifierTableData(0), IdentifierLookupTable(0),
+ Consumer(0), IdentifierTableData(0), IdentifierLookupTable(0),
IdentifierOffsets(0),
MethodPoolLookupTable(0), MethodPoolLookupTableData(0),
TotalSelectorsInMethodPool(0), SelectorOffsets(0),
PCHReader::PCHReader(SourceManager &SourceMgr, FileManager &FileMgr,
Diagnostic &Diags, const char *isysroot)
: DeserializationListener(0), SourceMgr(SourceMgr), FileMgr(FileMgr),
- Diags(Diags), SemaObj(0), PP(0), Context(0), StatCache(0), Consumer(0),
+ Diags(Diags), SemaObj(0), PP(0), Context(0), Consumer(0),
IdentifierTableData(0), IdentifierLookupTable(0),
IdentifierOffsets(0),
MethodPoolLookupTable(0), MethodPoolLookupTableData(0),
RelocatablePCH = false;
}
-PCHReader::~PCHReader() {}
+PCHReader::~PCHReader() {
+ for (unsigned i = 0, e = Chain.size(); i != e; ++i)
+ delete Chain[e - i - 1];
+}
+
+PCHReader::PerFileData::PerFileData()
+ : StatCache(0)
+{}
namespace {
PCHReader::PCHReadResult PCHReader::ReadSourceManagerBlock() {
using namespace SrcMgr;
+ llvm::BitstreamCursor &SLocEntryCursor = Chain[0]->SLocEntryCursor;
+
// Set the source-location entry cursor to the current position in
// the stream. This cursor will be used to read the contents of the
// source manager block initially, and then lazily read
// source-location entries as needed.
- SLocEntryCursor = Stream;
+ SLocEntryCursor = Chain[0]->Stream;
// The stream itself is going to skip over the source manager block.
- if (Stream.SkipBlock()) {
+ if (Chain[0]->Stream.SkipBlock()) {
Error("malformed block record in PCH file");
return Failure;
}
return Failure;
}
+ llvm::BitstreamCursor &SLocEntryCursor = Chain[0]->SLocEntryCursor;
+
++NumSLocEntriesRead;
SLocEntryCursor.JumpToBit(SLocOffsets[ID - 1]);
unsigned Code = SLocEntryCursor.ReadCode();
void PCHReader::ReadMacroRecord(uint64_t Offset) {
assert(PP && "Forgot to set Preprocessor ?");
+ llvm::BitstreamCursor &Stream = Chain[0]->Stream;
+
// Keep track of where we are in the stream, then jump back there
// after reading this macro.
SavedStreamPosition SavedPosition(Stream);
}
void PCHReader::ReadDefinedMacros() {
+ llvm::BitstreamCursor &MacroCursor = Chain[0]->MacroCursor;
+
// If there was no preprocessor block, do nothing.
if (!MacroCursor.getBitStreamReader())
return;
PCHReader::PCHReadResult
PCHReader::ReadPCHBlock() {
+ PerFileData &F = *Chain[0];
+ llvm::BitstreamCursor &Stream = F.Stream;
+
if (Stream.EnterSubBlock(pch::PCH_BLOCK_ID)) {
Error("malformed block record in PCH file");
return Failure;
// DeclsCursor cursor to point into it. Clone our current bitcode
// cursor to it, enter the block and read the abbrevs in that block.
// With the main cursor, we just skip over it.
- DeclsCursor = Stream;
+ F.DeclsCursor = Stream;
if (Stream.SkipBlock() || // Skip with the main cursor.
// Read the abbrevs.
- ReadBlockAbbrevs(DeclsCursor, pch::DECLTYPES_BLOCK_ID)) {
+ ReadBlockAbbrevs(F.DeclsCursor, pch::DECLTYPES_BLOCK_ID)) {
Error("malformed block record in PCH file");
return Failure;
}
break;
case pch::PREPROCESSOR_BLOCK_ID:
- MacroCursor = Stream;
+ F.MacroCursor = Stream;
if (PP)
PP->setExternalSource(this);
(const unsigned char *)BlobStart,
NumStatHits, NumStatMisses);
FileMgr.addStatCache(MyStatCache);
- StatCache = MyStatCache;
+ F.StatCache = MyStatCache;
break;
}
}
PCHReader::PCHReadResult PCHReader::ReadPCH(const std::string &FileName) {
+ Chain.push_back(new PerFileData());
+ PerFileData &F = *Chain.back();
+
// Set the PCH file name.
- this->FileName = FileName;
+ F.FileName = FileName;
// Open the PCH file.
//
// FIXME: This shouldn't be here, we should just take a raw_ostream.
std::string ErrStr;
- Buffer.reset(llvm::MemoryBuffer::getFileOrSTDIN(FileName, &ErrStr));
- if (!Buffer) {
+ F.Buffer.reset(llvm::MemoryBuffer::getFileOrSTDIN(FileName, &ErrStr));
+ if (!F.Buffer) {
Error(ErrStr.c_str());
return IgnorePCH;
}
// Initialize the stream
- StreamFile.init((const unsigned char *)Buffer->getBufferStart(),
- (const unsigned char *)Buffer->getBufferEnd());
- Stream.init(StreamFile);
+ F.StreamFile.init((const unsigned char *)F.Buffer->getBufferStart(),
+ (const unsigned char *)F.Buffer->getBufferEnd());
+ llvm::BitstreamCursor &Stream = F.Stream;
+ Stream.init(F.StreamFile);
// Sniff for the signature.
if (Stream.Read(8) != 'C' ||
SourceMgr.ClearPreallocatedSLocEntries();
// Remove the stat cache.
- if (StatCache)
- FileMgr.removeStatCache((PCHStatCache*)StatCache);
+ if (F.StatCache)
+ FileMgr.removeStatCache((PCHStatCache*)F.StatCache);
return IgnorePCH;
}
/// 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) {
+ llvm::BitstreamCursor &DeclsCursor = Chain[0]->DeclsCursor;
+
// Keep track of where we are in the stream, then jump back there
// after reading this type.
SavedStreamPosition SavedPosition(DeclsCursor);
Stmt *PCHReader::GetExternalDeclStmt(uint64_t Offset) {
// Since we know tha this statement is part of a decl, make sure to use the
// decl cursor to read it.
- DeclsCursor.JumpToBit(Offset);
- return ReadStmtFromStream(DeclsCursor);
+ Chain[0]->DeclsCursor.JumpToBit(Offset);
+ return ReadStmtFromStream(Chain[0]->DeclsCursor);
}
bool PCHReader::FindExternalLexicalDecls(const DeclContext *DC,
return true;
}
+ llvm::BitstreamCursor &DeclsCursor = Chain[0]->DeclsCursor;
+
// Keep track of where we are in the stream, then jump back there
// after reading this context.
SavedStreamPosition SavedPosition(DeclsCursor);
DeclContext::lookup_iterator());
}
+ llvm::BitstreamCursor &DeclsCursor = Chain[0]->DeclsCursor;
+
// Keep track of where we are in the stream, then jump back there
// after reading this context.
SavedStreamPosition SavedPosition(DeclsCursor);
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