#include <BitstreamReader.h>

Classes
struct	Block
Public Types
enum	{ AF_DontPopBlockAtEnd = 1, AF_DontAutoprocessAbbrevs = 2 }
	Flags that modify the behavior of advance(). More...
Public Member Functions
	BitstreamCursor ()
	BitstreamCursor (BitstreamReader &R)
void	init (BitstreamReader &R)
void	freeState ()
bool	isEndPos (size_t pos)
bool	canSkipToPos (size_t pos) const
uint32_t	getWord (size_t pos)
bool	AtEndOfStream ()
unsigned	getAbbrevIDWidth () const
	getAbbrevIDWidth - Return the number of bits used to encode an abbrev #.
uint64_t	GetCurrentBitNo () const
	GetCurrentBitNo - Return the bit # of the bit we are reading.
BitstreamReader *	getBitStreamReader ()
const BitstreamReader *	getBitStreamReader () const
BitstreamEntry	advance (unsigned Flags=0)
BitstreamEntry	advanceSkippingSubblocks (unsigned Flags=0)
void	JumpToBit (uint64_t BitNo)
	JumpToBit - Reset the stream to the specified bit number.
uint32_t	Read (unsigned NumBits)
uint64_t	Read64 (unsigned NumBits)
uint32_t	ReadVBR (unsigned NumBits)
uint64_t	ReadVBR64 (unsigned NumBits)
unsigned	ReadCode ()
unsigned	ReadSubBlockID ()
bool	SkipBlock ()
bool	EnterSubBlock (unsigned BlockID, unsigned *NumWordsP=nullptr)
bool	ReadBlockEnd ()
const BitCodeAbbrev *	getAbbrev (unsigned AbbrevID)
	getAbbrev - Return the abbreviation for the specified AbbrevId.
void	skipRecord (unsigned AbbrevID)
	skipRecord - Read the current record and discard it.
unsigned	readRecord (unsigned AbbrevID, SmallVectorImpl< uint64_t > &Vals, StringRef *Blob=nullptr)
void	ReadAbbrevRecord ()
bool	ReadBlockInfoBlock ()
Friends
class	Deserializer

Detailed Description

BitstreamCursor - This represents a position within a bitcode file. There may be multiple independent cursors reading within one bitstream, each maintaining their own local state.

Unlike iterators, BitstreamCursors are heavy-weight objects that should not be passed by value.

Definition at line 176 of file BitstreamReader.h.

Member Enumeration Documentation

anonymous enum

Flags that modify the behavior of advance().

Enumerator:

AF_DontPopBlockAtEnd	AF_DontPopBlockAtEnd - If this flag is used, the advance() method does not automatically pop the block scope when the end of a block is reached.
AF_DontAutoprocessAbbrevs	AF_DontAutoprocessAbbrevs - If this flag is used, abbrev entries are returned just like normal records.

Definition at line 269 of file BitstreamReader.h.

Constructor & Destructor Documentation

llvm::BitstreamCursor::BitstreamCursor ( ) [inline]

Definition at line 212 of file BitstreamReader.h.

llvm::BitstreamCursor::BitstreamCursor ( BitstreamReader & R ) [inline, explicit]

Definition at line 214 of file BitstreamReader.h.

Member Function Documentation

BitstreamEntry llvm::BitstreamCursor::advance ( unsigned Flags = 0 ) [inline]

advance - Advance the current bitstream, returning the next entry in the stream.

Definition at line 282 of file BitstreamReader.h.

References AF_DontAutoprocessAbbrevs, AF_DontPopBlockAtEnd, llvm::tgtok::Code, llvm::bitc::DEFINE_ABBREV, llvm::bitc::END_BLOCK, llvm::bitc::ENTER_SUBBLOCK, llvm::BitstreamEntry::getEndBlock(), llvm::BitstreamEntry::getError(), llvm::BitstreamEntry::getRecord(), llvm::BitstreamEntry::getSubBlock(), ReadAbbrevRecord(), ReadBlockEnd(), ReadCode(), and ReadSubBlockID().

Referenced by advanceSkippingSubblocks(), llvm::BitcodeReader::ParseBitcodeInto(), and llvm::BitcodeReader::parseTriple().

BitstreamEntry llvm::BitstreamCursor::advanceSkippingSubblocks ( unsigned Flags = 0 ) [inline]

advanceSkippingSubblocks - This is a convenience function for clients that don't expect any subblocks. This just skips over them automatically.

Definition at line 309 of file BitstreamReader.h.

References advance(), llvm::BitstreamEntry::getError(), llvm::BitstreamEntry::Kind, SkipBlock(), and llvm::BitstreamEntry::SubBlock.

Referenced by ReadBlockInfoBlock().

bool llvm::BitstreamCursor::AtEndOfStream ( ) [inline]

Definition at line 249 of file BitstreamReader.h.

References isEndPos().

Referenced by EnterSubBlock(), llvm::BitcodeReader::ParseBitcodeInto(), and SkipBlock().

bool llvm::BitstreamCursor::canSkipToPos ( size_t pos ) const [inline]

Definition at line 237 of file BitstreamReader.h.

References llvm::BitstreamReader::getBitcodeBytes(), and llvm::StreamableMemoryObject::isValidAddress().

Referenced by JumpToBit(), readRecord(), SkipBlock(), and skipRecord().

bool BitstreamCursor::EnterSubBlock	(	unsigned	BlockID,
		unsigned *	NumWordsP = `nullptr`
	)

EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, enter the block, and return true if the block has an error.

Definition at line 28 of file BitstreamReader.cpp.

References AtEndOfStream(), llvm::SmallVectorTemplateCommon< T, typename >::back(), llvm::bitc::BlockSizeWidth, llvm::bitc::CodeLenWidth, llvm::BitstreamReader::getBlockInfo(), llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), Read(), and ReadVBR().

Referenced by ReadBlockInfoBlock().

void BitstreamCursor::freeState ( )

Definition at line 18 of file BitstreamReader.cpp.

References llvm::SmallVectorImpl< T >::clear().

Referenced by init().

const BitCodeAbbrev* llvm::BitstreamCursor::getAbbrev ( unsigned AbbrevID ) [inline]

getAbbrev - Return the abbreviation for the specified AbbrevId.

Definition at line 528 of file BitstreamReader.h.

References llvm::bitc::FIRST_APPLICATION_ABBREV.

Referenced by readRecord(), and skipRecord().

unsigned llvm::BitstreamCursor::getAbbrevIDWidth ( ) const [inline]

getAbbrevIDWidth - Return the number of bits used to encode an abbrev #.

Definition at line 254 of file BitstreamReader.h.

Referenced by llvm::BitcodeReader::ParseBitcodeInto().

BitstreamReader* llvm::BitstreamCursor::getBitStreamReader ( ) [inline]

Definition at line 261 of file BitstreamReader.h.

const BitstreamReader* llvm::BitstreamCursor::getBitStreamReader ( ) const [inline]

Definition at line 264 of file BitstreamReader.h.

uint64_t llvm::BitstreamCursor::GetCurrentBitNo ( ) const [inline]

GetCurrentBitNo - Return the bit # of the bit we are reading.

Definition at line 257 of file BitstreamReader.h.

Referenced by readRecord(), SkipBlock(), and skipRecord().

uint32_t llvm::BitstreamCursor::getWord ( size_t pos ) [inline]

Definition at line 243 of file BitstreamReader.h.

References llvm::BitstreamReader::getBitcodeBytes(), and llvm::StreamableMemoryObject::readBytes().

void llvm::BitstreamCursor::init ( BitstreamReader & R ) [inline]

Definition at line 221 of file BitstreamReader.h.

References freeState().

bool llvm::BitstreamCursor::isEndPos ( size_t pos ) [inline]

Definition at line 233 of file BitstreamReader.h.

References llvm::BitstreamReader::getBitcodeBytes(), and llvm::StreamableMemoryObject::isObjectEnd().

Referenced by AtEndOfStream(), and Read().

void llvm::BitstreamCursor::JumpToBit ( uint64_t BitNo ) [inline]

JumpToBit - Reset the stream to the specified bit number.

Definition at line 323 of file BitstreamReader.h.

References canSkipToPos(), Read(), and Read64().

Referenced by llvm::BitcodeReader::Materialize(), readRecord(), SkipBlock(), and skipRecord().

uint32_t llvm::BitstreamCursor::Read ( unsigned NumBits ) [inline]

Definition at line 343 of file BitstreamReader.h.

References llvm::BitstreamReader::getBitcodeBytes(), isEndPos(), llvm::support::little, llvm::LibFunc::memcpy, llvm::StreamableMemoryObject::readBytes(), and llvm::support::unaligned.

Referenced by EnterSubBlock(), JumpToBit(), llvm::BitcodeReader::ParseBitcodeInto(), llvm::BitcodeReader::parseTriple(), Read64(), ReadAbbrevRecord(), ReadCode(), ReadVBR(), ReadVBR64(), and SkipBlock().

uint64_t llvm::BitstreamCursor::Read64 ( unsigned NumBits ) [inline]

Definition at line 395 of file BitstreamReader.h.

References Read().

Referenced by JumpToBit().

void BitstreamCursor::ReadAbbrevRecord ( )

Definition at line 248 of file BitstreamReader.cpp.

References llvm::BitCodeAbbrev::Add(), llvm::BitCodeAbbrevOp::Fixed, llvm::BitCodeAbbrevOp::hasEncodingData(), Read(), ReadVBR(), ReadVBR64(), and llvm::BitCodeAbbrevOp::VBR.

Referenced by advance(), and ReadBlockInfoBlock().

bool llvm::BitstreamCursor::ReadBlockEnd ( ) [inline]

Definition at line 494 of file BitstreamReader.h.

References llvm::SmallVectorBase::empty().

Referenced by advance().

bool BitstreamCursor::ReadBlockInfoBlock ( )

Definition at line 278 of file BitstreamReader.cpp.

References llvm::BitstreamReader::BlockInfo::Abbrevs, advanceSkippingSubblocks(), AF_DontAutoprocessAbbrevs, llvm::bitc::BLOCKINFO_BLOCK_ID, llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, llvm::bitc::BLOCKINFO_CODE_SETBID, llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, llvm::SmallVectorImpl< T >::clear(), llvm::bitc::DEFINE_ABBREV, llvm::BitstreamEntry::EndBlock, EnterSubBlock(), llvm::BitstreamEntry::Error, llvm::BitstreamReader::getOrCreateBlockInfo(), llvm::BitstreamReader::hasBlockInfoRecords(), llvm::BitstreamEntry::ID, llvm::BitstreamReader::isIgnoringBlockInfoNames(), llvm::BitstreamEntry::Kind, llvm::BitstreamReader::BlockInfo::Name, Name, ReadAbbrevRecord(), readRecord(), llvm::BitstreamEntry::Record, llvm::BitstreamReader::BlockInfo::RecordNames, llvm::SmallVectorTemplateCommon< T >::size(), SkipBlock(), and llvm::BitstreamEntry::SubBlock.

Referenced by llvm::BitcodeReader::ParseBitcodeInto().

unsigned llvm::BitstreamCursor::ReadCode ( ) [inline]

Definition at line 456 of file BitstreamReader.h.

References Read().

Referenced by advance().

unsigned BitstreamCursor::readRecord	(	unsigned	AbbrevID,
		SmallVectorImpl< uint64_t > &	Vals,
		StringRef *	Blob = `nullptr`
	)

unsigned llvm::BitstreamCursor::ReadSubBlockID ( ) [inline]

ReadSubBlockID - Having read the ENTER_SUBBLOCK code, read the BlockID for the block.

Definition at line 466 of file BitstreamReader.h.

References llvm::bitc::BlockIDWidth, and ReadVBR().

Referenced by advance().

uint32_t llvm::BitstreamCursor::ReadVBR ( unsigned NumBits ) [inline]

Definition at line 402 of file BitstreamReader.h.

References Read().

Referenced by EnterSubBlock(), ReadAbbrevRecord(), readRecord(), ReadSubBlockID(), SkipBlock(), and skipRecord().

uint64_t llvm::BitstreamCursor::ReadVBR64 ( unsigned NumBits ) [inline]

Definition at line 422 of file BitstreamReader.h.

References Read().

Referenced by ReadAbbrevRecord(), readRecord(), and skipRecord().

bool llvm::BitstreamCursor::SkipBlock ( ) [inline]

SkipBlock - Having read the ENTER_SUBBLOCK abbrevid and a BlockID, skip over the body of this block. If the block record is malformed, return true.

Definition at line 473 of file BitstreamReader.h.

References AtEndOfStream(), llvm::bitc::BlockSizeWidth, canSkipToPos(), llvm::bitc::CodeLenWidth, GetCurrentBitNo(), JumpToBit(), Read(), and ReadVBR().

Referenced by advanceSkippingSubblocks(), llvm::BitcodeReader::ParseBitcodeInto(), llvm::BitcodeReader::parseTriple(), and ReadBlockInfoBlock().

void BitstreamCursor::skipRecord ( unsigned AbbrevID )

skipRecord - Read the current record and discard it.

Definition at line 104 of file BitstreamReader.cpp.

References llvm::BitCodeAbbrevOp::Array, llvm::BitCodeAbbrevOp::Blob, canSkipToPos(), llvm::tgtok::Code, getAbbrev(), llvm::BitstreamReader::getBitcodeBytes(), GetCurrentBitNo(), llvm::BitCodeAbbrevOp::getEncoding(), llvm::StreamableMemoryObject::getExtent(), llvm::BitCodeAbbrev::getNumOperandInfos(), llvm::BitCodeAbbrev::getOperandInfo(), llvm::BitCodeAbbrevOp::isLiteral(), JumpToBit(), ReadVBR(), ReadVBR64(), and llvm::bitc::UNABBREV_RECORD.

Referenced by llvm::BitcodeReader::parseTriple().

Friends And Related Function Documentation

friend class Deserializer [friend]

Definition at line 177 of file BitstreamReader.h.

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

Classes

Public Types

Public Member Functions

Friends

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation