#include "llvm/Bitstream/BitstreamWriter.h"

Public Member Functions
	BitstreamWriter (raw_ostream &OutStream, uint32_t FlushThreshold=512)
	Create a BitstreamWriter over a raw_ostream `OutStream`.

	BitstreamWriter (SmallVectorImpl< char > &Buff)
	Convenience constructor for users that start with a vector - avoids needing to wrap it in a raw_svector_ostream.

	~BitstreamWriter ()

void	markAndBlockFlushing ()
	For scenarios where the user wants to access a section of the stream to (for example) compute some checksum, disable flushing and remember the position in the internal buffer where that happened.

StringRef	getMarkedBufferAndResumeFlushing ()
	resumes flushing, but does not flush, and returns the section in the internal buffer starting from the position marked with markAndBlockFlushing.

uint64_t	GetCurrentBitNo () const
	Retrieve the current position in the stream, in bits.

unsigned	GetAbbrevIDWidth () const
	Retrieve the number of bits currently used to encode an abbrev ID.

void	BackpatchByte (uint64_t BitNo, uint8_t NewByte)
	Backpatch a byte in the output at the given bit offset with the specified value.

void	BackpatchHalfWord (uint64_t BitNo, uint16_t Val)

void	BackpatchWord (uint64_t BitNo, unsigned Val)

void	BackpatchWord64 (uint64_t BitNo, uint64_t Val)

void	Emit (uint32_t Val, unsigned NumBits)

void	FlushToWord ()

void	EmitVBR (uint32_t Val, unsigned NumBits)

void	EmitVBR64 (uint64_t Val, unsigned NumBits)

void	EmitCode (unsigned Val)
	EmitCode - Emit the specified code.

BlockInfo *	getBlockInfo (unsigned BlockID)
	getBlockInfo - If there is block info for the specified ID, return it, otherwise return null.

void	EnterSubblock (unsigned BlockID, unsigned CodeLen)

void	ExitBlock ()

template<class UIntTy >
void	emitBlob (ArrayRef< UIntTy > Bytes, bool ShouldEmitSize=true)
	Emit a blob, including flushing before and tail-padding.

void	emitBlob (StringRef Bytes, bool ShouldEmitSize=true)

template<typename Container >
void	EmitRecord (unsigned Code, const Container &Vals, unsigned Abbrev=0)
	EmitRecord - Emit the specified record to the stream, using an abbrev if we have one to compress the output.

template<typename Container >
void	EmitRecordWithAbbrev (unsigned Abbrev, const Container &Vals)
	EmitRecordWithAbbrev - Emit a record with the specified abbreviation.

template<typename Container >
void	EmitRecordWithBlob (unsigned Abbrev, const Container &Vals, StringRef Blob)
	EmitRecordWithBlob - Emit the specified record to the stream, using an abbrev that includes a blob at the end.

template<typename Container >
void	EmitRecordWithBlob (unsigned Abbrev, const Container &Vals, const char *BlobData, unsigned BlobLen)

template<typename Container >
void	EmitRecordWithArray (unsigned Abbrev, const Container &Vals, StringRef Array)
	EmitRecordWithArray - Just like EmitRecordWithBlob, works with records that end with an array.

template<typename Container >
void	EmitRecordWithArray (unsigned Abbrev, const Container &Vals, const char *ArrayData, unsigned ArrayLen)

unsigned	EmitAbbrev (std::shared_ptr< BitCodeAbbrev > Abbv)
	Emits the abbreviation `Abbv` to the stream.

void	EnterBlockInfoBlock ()
	EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.

unsigned	EmitBlockInfoAbbrev (unsigned BlockID, std::shared_ptr< BitCodeAbbrev > Abbv)
	EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified BlockID.

Detailed Description

Definition at line 31 of file BitstreamWriter.h.

Constructor & Destructor Documentation

◆ BitstreamWriter() [1/2]

llvm::BitstreamWriter::BitstreamWriter	(	raw_ostream &	OutStream,
		uint32_t	FlushThreshold = `512`
	)

inline

Create a BitstreamWriter over a raw_ostream OutStream.

If OutStream is a raw_svector_ostream, the BitstreamWriter will write directly to the latter's buffer. In all other cases, the BitstreamWriter will use an internal buffer and flush at the end of its lifetime.

In addition, if is a raw_fd_stream supporting seek, tell, and read (besides write), the BitstreamWriter will also flush incrementally, when a subblock is finished, and if the FlushThreshold is passed.

NOTE: FlushThreshold's unit is MB.

Definition at line 156 of file BitstreamWriter.h.

◆ BitstreamWriter() [2/2]

llvm::BitstreamWriter::BitstreamWriter ( SmallVectorImpl< char > & Buff )

inline

Convenience constructor for users that start with a vector - avoids needing to wrap it in a raw_svector_ostream.

Definition at line 163 of file BitstreamWriter.h.

◆ ~BitstreamWriter()

llvm::BitstreamWriter::~BitstreamWriter ( )

inline

Definition at line 166 of file BitstreamWriter.h.

References assert(), and FlushToWord().

Member Function Documentation

◆ BackpatchByte()

void llvm::BitstreamWriter::BackpatchByte	(	uint64_t	BitNo,
		uint8_t	NewByte
	)

inline

Backpatch a byte in the output at the given bit offset with the specified value.

Definition at line 205 of file BitstreamWriter.h.

References assert(), llvm::little, llvm::raw_fd_stream::read(), llvm::support::endian::readAtBitAlignment(), llvm::raw_fd_ostream::seek(), llvm::raw_ostream::tell(), and llvm::raw_ostream::write().

Referenced by BackpatchHalfWord().

◆ BackpatchHalfWord()

void llvm::BitstreamWriter::BackpatchHalfWord	(	uint64_t	BitNo,
		uint16_t	Val
	)

inline

Definition at line 267 of file BitstreamWriter.h.

References BackpatchByte().

Referenced by BackpatchWord().

◆ BackpatchWord()

void llvm::BitstreamWriter::BackpatchWord	(	uint64_t	BitNo,
		unsigned	Val
	)

inline

Definition at line 272 of file BitstreamWriter.h.

References BackpatchHalfWord().

Referenced by BackpatchWord64(), and ExitBlock().

◆ BackpatchWord64()

void llvm::BitstreamWriter::BackpatchWord64	(	uint64_t	BitNo,
		uint64_t	Val
	)

inline

Definition at line 277 of file BitstreamWriter.h.

References BackpatchWord().

◆ Emit()

void llvm::BitstreamWriter::Emit	(	uint32_t	Val,
		unsigned	NumBits
	)

inline

Definition at line 282 of file BitstreamWriter.h.

References assert().

Referenced by llvm::dxil::BitcodeWriter::BitcodeWriter(), EmitCode(), EmitVBR(), EmitVBR64(), EnterSubblock(), llvm::remarks::BitstreamRemarkSerializerHelper::setupBlockInfo(), and writeBitcodeHeader().

◆ EmitAbbrev()

unsigned llvm::BitstreamWriter::EmitAbbrev ( std::shared_ptr< BitCodeAbbrev > Abbv )

inline

Emits the abbreviation Abbv to the stream.

Definition at line 651 of file BitstreamWriter.h.

References llvm::bitc::FIRST_APPLICATION_ABBREV.

Referenced by llvm::BCGenericRecordLayout< IDField, Fields >::emitAbbrev(), and writeIdentificationBlock().

◆ emitBlob() [1/2]

template<class UIntTy >

void llvm::BitstreamWriter::emitBlob	(	ArrayRef< UIntTy >	Bytes,
		bool	ShouldEmitSize = `true`
	)

inline

Emit a blob, including flushing before and tail-padding.

Definition at line 547 of file BitstreamWriter.h.

References llvm::all_of(), llvm::SmallVectorImpl< T >::append(), assert(), B, llvm::ArrayRef< T >::begin(), EmitVBR(), llvm::ArrayRef< T >::end(), FlushToWord(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::ArrayRef< T >::size().

Referenced by emitBlob().

◆ emitBlob() [2/2]

void llvm::BitstreamWriter::emitBlob	(	StringRef	Bytes,
		bool	ShouldEmitSize = `true`
	)

inline

Definition at line 563 of file BitstreamWriter.h.

References llvm::StringRef::data(), emitBlob(), and llvm::StringRef::size().

◆ EmitBlockInfoAbbrev()

unsigned llvm::BitstreamWriter::EmitBlockInfoAbbrev	(	unsigned	BlockID,
		std::shared_ptr< BitCodeAbbrev >	Abbv
	)

inline

EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified BlockID.

Definition at line 693 of file BitstreamWriter.h.

References llvm::bitc::FIRST_APPLICATION_ABBREV, and Info.

Referenced by llvm::remarks::BitstreamRemarkSerializerHelper::setupMetaBlockInfo(), llvm::remarks::BitstreamRemarkSerializerHelper::setupMetaExternalFile(), llvm::remarks::BitstreamRemarkSerializerHelper::setupMetaRemarkVersion(), llvm::remarks::BitstreamRemarkSerializerHelper::setupMetaStrTab(), and llvm::remarks::BitstreamRemarkSerializerHelper::setupRemarkBlockInfo().

◆ EmitCode()

void llvm::BitstreamWriter::EmitCode ( unsigned Val )

inline

EmitCode - Emit the specified code.

Definition at line 342 of file BitstreamWriter.h.

References Emit().

Referenced by EmitRecord(), EnterSubblock(), and ExitBlock().

◆ EmitRecord()

template<typename Container >

void llvm::BitstreamWriter::EmitRecord	(	unsigned	Code,
		const Container &	Vals,
		unsigned	Abbrev = `0`
	)

inline

EmitRecord - Emit the specified record to the stream, using an abbrev if we have one to compress the output.

Definition at line 571 of file BitstreamWriter.h.

References EmitCode(), EmitVBR(), EmitVBR64(), and llvm::bitc::UNABBREV_RECORD.

Referenced by llvm::PGOCtxProfileWriter::PGOCtxProfileWriter(), writeFunctionHeapProfileRecords(), writeFunctionTypeMetadataRecords(), writeIdentificationBlock(), writeStringRecord(), and llvm::dxil::DXILBitcodeWriter::writeStringRecord().

◆ EmitRecordWithAbbrev()

template<typename Container >

void llvm::BitstreamWriter::EmitRecordWithAbbrev	(	unsigned	Abbrev,
		const Container &	Vals
	)

inline

EmitRecordWithAbbrev - Emit a record with the specified abbreviation.

Unlike EmitRecord, the code for the record should be included in Vals as the first entry.

Definition at line 591 of file BitstreamWriter.h.

Referenced by llvm::detail::BCRecordCoding< BCArray< ElementTy > >::emit(), llvm::detail::BCRecordCoding< ElementTy >::emit(), llvm::remarks::BitstreamRemarkSerializerHelper::emitMetaBlock(), llvm::remarks::BitstreamRemarkSerializerHelper::emitMetaRemarkVersion(), and llvm::remarks::BitstreamRemarkSerializerHelper::emitRemarkBlock().

◆ EmitRecordWithArray() [1/2]

template<typename Container >

void llvm::BitstreamWriter::EmitRecordWithArray	(	unsigned	Abbrev,
		const Container &	Vals,
		const char *	ArrayData,
		unsigned	ArrayLen
	)

inline

Definition at line 620 of file BitstreamWriter.h.

◆ EmitRecordWithArray() [2/2]

template<typename Container >

void llvm::BitstreamWriter::EmitRecordWithArray	(	unsigned	Abbrev,
		const Container &	Vals,
		StringRef	Array
	)

inline

EmitRecordWithArray - Just like EmitRecordWithBlob, works with records that end with an array.

Definition at line 615 of file BitstreamWriter.h.

Referenced by llvm::detail::BCRecordCoding< BCArray< ElementTy > >::emit().

◆ EmitRecordWithBlob() [1/2]

template<typename Container >

void llvm::BitstreamWriter::EmitRecordWithBlob	(	unsigned	Abbrev,
		const Container &	Vals,
		const char *	BlobData,
		unsigned	BlobLen
	)

inline

Definition at line 606 of file BitstreamWriter.h.

◆ EmitRecordWithBlob() [2/2]

template<typename Container >

void llvm::BitstreamWriter::EmitRecordWithBlob	(	unsigned	Abbrev,
		const Container &	Vals,
		StringRef	Blob
	)

inline

EmitRecordWithBlob - Emit the specified record to the stream, using an abbrev that includes a blob at the end.

The blob data to emit is specified by the pointer and length specified at the end. In contrast to EmitRecord, this routine expects that the first entry in Vals is the code of the record.

Definition at line 601 of file BitstreamWriter.h.

Referenced by llvm::detail::BCRecordCoding< BCBlob >::emit(), llvm::remarks::BitstreamRemarkSerializerHelper::emitMetaExternalFile(), and llvm::remarks::BitstreamRemarkSerializerHelper::emitMetaStrTab().

◆ EmitVBR()

void llvm::BitstreamWriter::EmitVBR	(	uint32_t	Val,
		unsigned	NumBits
	)

inline

Definition at line 309 of file BitstreamWriter.h.

References assert(), and Emit().

Referenced by emitBlob(), EmitRecord(), EmitVBR64(), and EnterSubblock().

◆ EmitVBR64()

void llvm::BitstreamWriter::EmitVBR64	(	uint64_t	Val,
		unsigned	NumBits
	)

inline

Definition at line 323 of file BitstreamWriter.h.

References assert(), Emit(), and EmitVBR().

Referenced by EmitRecord().

◆ EnterBlockInfoBlock()

void llvm::BitstreamWriter::EnterBlockInfoBlock ( )

inline

EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.

Definition at line 663 of file BitstreamWriter.h.

References llvm::bitc::BLOCKINFO_BLOCK_ID, and EnterSubblock().

Referenced by llvm::PGOCtxProfileWriter::PGOCtxProfileWriter(), and llvm::remarks::BitstreamRemarkSerializerHelper::setupBlockInfo().

◆ EnterSubblock()

void llvm::BitstreamWriter::EnterSubblock	(	unsigned	BlockID,
		unsigned	CodeLen
	)

inline

◆ ExitBlock()

void llvm::BitstreamWriter::ExitBlock ( )

inline

Definition at line 390 of file BitstreamWriter.h.

References assert(), B, BackpatchWord(), EmitCode(), llvm::bitc::END_BLOCK, and FlushToWord().

Referenced by llvm::remarks::BitstreamRemarkSerializerHelper::emitMetaBlock(), llvm::remarks::BitstreamRemarkSerializerHelper::emitRemarkBlock(), llvm::PGOCtxProfileWriter::PGOCtxProfileWriter(), llvm::remarks::BitstreamRemarkSerializerHelper::setupBlockInfo(), llvm::dxil::DXILBitcodeWriter::write(), writeIdentificationBlock(), and llvm::BCBlockRAII::~BCBlockRAII().

◆ FlushToWord()

void llvm::BitstreamWriter::FlushToWord ( )

inline

Definition at line 301 of file BitstreamWriter.h.

Referenced by emitBlob(), EnterSubblock(), ExitBlock(), and ~BitstreamWriter().

◆ GetAbbrevIDWidth()

unsigned llvm::BitstreamWriter::GetAbbrevIDWidth ( ) const

inline

Retrieve the number of bits currently used to encode an abbrev ID.

Definition at line 197 of file BitstreamWriter.h.

◆ getBlockInfo()

BlockInfo * llvm::BitstreamWriter::getBlockInfo ( unsigned BlockID )

inline

getBlockInfo - If there is block info for the specified ID, return it, otherwise return null.

Definition at line 352 of file BitstreamWriter.h.

Referenced by EnterSubblock().

◆ GetCurrentBitNo()

uint64_t llvm::BitstreamWriter::GetCurrentBitNo ( ) const

inline

Retrieve the current position in the stream, in bits.

Definition at line 194 of file BitstreamWriter.h.

◆ getMarkedBufferAndResumeFlushing()

StringRef llvm::BitstreamWriter::getMarkedBufferAndResumeFlushing ( )

inline

resumes flushing, but does not flush, and returns the section in the internal buffer starting from the position marked with markAndBlockFlushing.

The return should be processed before any additional calls to this object, because those may cause a flush and invalidate the return.

Definition at line 186 of file BitstreamWriter.h.

References assert(), and llvm::SmallVectorBase< Size_T >::size().

◆ markAndBlockFlushing()

void llvm::BitstreamWriter::markAndBlockFlushing ( )

inline

For scenarios where the user wants to access a section of the stream to (for example) compute some checksum, disable flushing and remember the position in the internal buffer where that happened.

Must be paired with a call to getMarkedBufferAndResumeFlushing.

Definition at line 176 of file BitstreamWriter.h.

References assert(), and llvm::SmallVectorBase< Size_T >::size().

The documentation for this class was generated from the following file:

include/llvm/Bitstream/BitstreamWriter.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ BitstreamWriter() [1/2]

◆ BitstreamWriter() [2/2]

◆ ~BitstreamWriter()

Member Function Documentation

◆ BackpatchByte()

◆ BackpatchHalfWord()

◆ BackpatchWord()

◆ BackpatchWord64()

◆ Emit()

◆ EmitAbbrev()

◆ emitBlob() [1/2]

◆ emitBlob() [2/2]

◆ EmitBlockInfoAbbrev()

◆ EmitCode()

◆ EmitRecord()

◆ EmitRecordWithAbbrev()

◆ EmitRecordWithArray() [1/2]

◆ EmitRecordWithArray() [2/2]

◆ EmitRecordWithBlob() [1/2]

◆ EmitRecordWithBlob() [2/2]

◆ EmitVBR()

◆ EmitVBR64()

◆ EnterBlockInfoBlock()

◆ EnterSubblock()

◆ ExitBlock()

◆ FlushToWord()

◆ GetAbbrevIDWidth()

◆ getBlockInfo()

◆ GetCurrentBitNo()

◆ getMarkedBufferAndResumeFlushing()

◆ markAndBlockFlushing()