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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221495 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-11-06 22:57:10 +00:00
parent 848edb1bfa
commit cce2cdd98a
1 changed files with 56 additions and 70 deletions
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126
include/llvm/Bitcode/BitstreamReader.h
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@ -24,17 +24,16 @@
namespace llvm {
class Deserializer;
class Deserializer;
/// BitstreamReader - This class is used to read from an LLVM bitcode stream,
/// maintaining information that is global to decoding the entire file. While
/// a file is being read, multiple cursors can be independently advanced or
/// skipped around within the file. These are represented by the
/// BitstreamCursor class.
/// This class is used to read from an LLVM bitcode stream, maintaining
/// information that is global to decoding the entire file. While a file is
/// being read, multiple cursors can be independently advanced or skipped around
/// within the file. These are represented by the BitstreamCursor class.
class BitstreamReader {
public:
/// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
/// These describe abbreviations that all blocks of the specified ID inherit.
/// This contains information emitted to BLOCKINFO_BLOCK blocks. These
/// describe abbreviations that all blocks of the specified ID inherit.
struct BlockInfo {
unsigned BlockID;
std::vector<IntrusiveRefCntPtr<BitCodeAbbrev>> Abbrevs;
@ -47,9 +46,8 @@ private:
std::vector<BlockInfo> BlockInfoRecords;
/// IgnoreBlockInfoNames - This is set to true if we don't care about the
/// block/record name information in the BlockInfo block. Only llvm-bcanalyzer
/// uses this.
/// This is set to true if we don't care about the block/record name
/// information in the BlockInfo block. Only llvm-bcanalyzer uses this.
bool IgnoreBlockInfoNames;
BitstreamReader(const BitstreamReader&) LLVM_DELETED_FUNCTION;
@ -86,8 +84,7 @@ public:
StreamableMemoryObject &getBitcodeBytes() { return *BitcodeBytes; }
/// CollectBlockInfoNames - This is called by clients that want block/record
/// name information.
/// This is called by clients that want block/record name information.
void CollectBlockInfoNames() { IgnoreBlockInfoNames = false; }
bool isIgnoringBlockInfoNames() { return IgnoreBlockInfoNames; }
@ -95,13 +92,13 @@ public:
// Block Manipulation
//===--------------------------------------------------------------------===//
/// hasBlockInfoRecords - Return true if we've already read and processed the
/// block info block for this Bitstream. We only process it for the first
/// cursor that walks over it.
/// Return true if we've already read and processed the block info block for
/// this Bitstream. We only process it for the first cursor that walks over
/// it.
bool hasBlockInfoRecords() const { return !BlockInfoRecords.empty(); }
/// getBlockInfo - If there is block info for the specified ID, return it,
/// otherwise return null.
/// If there is block info for the specified ID, return it, otherwise return
/// null.
const BlockInfo *getBlockInfo(unsigned BlockID) const {
// Common case, the most recent entry matches BlockID.
if (!BlockInfoRecords.empty() && BlockInfoRecords.back().BlockID == BlockID)
@ -134,21 +131,15 @@ public:
}
};
/// BitstreamEntry - When advancing through a bitstream cursor, each advance can
/// discover a few different kinds of entries:
/// Error - Malformed bitcode was found.
/// EndBlock - We've reached the end of the current block, (or the end of the
/// file, which is treated like a series of EndBlock records.
/// SubBlock - This is the start of a new subblock of a specific ID.
/// Record - This is a record with a specific AbbrevID.
///
/// When advancing through a bitstream cursor, each advance can discover a few
/// different kinds of entries:
struct BitstreamEntry {
enum {
Error,
EndBlock,
SubBlock,
Record
Error, // Malformed bitcode was found.
EndBlock, // We've reached the end of the current block, (or the end of the
// file, which is treated like a series of EndBlock records.
SubBlock, // This is the start of a new subblock of a specific ID.
Record // This is a record with a specific AbbrevID.
} Kind;
unsigned ID;
@ -167,9 +158,9 @@ struct BitstreamEntry {
}
};
/// 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.
/// 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.
@ -178,24 +169,23 @@ class BitstreamCursor {
BitstreamReader *BitStream;
size_t NextChar;
/// CurWord/word_t - This is the current data we have pulled from the stream
/// but have not returned to the client. This is specifically and
/// intentionally defined to follow the word size of the host machine for
/// efficiency. We use word_t in places that are aware of this to make it
/// perfectly explicit what is going on.
/// This is the current data we have pulled from the stream but have not
/// returned to the client. This is specifically and intentionally defined to
/// follow the word size of the host machine for efficiency. We use word_t in
/// places that are aware of this to make it perfectly explicit what is going
/// on.
typedef uint32_t word_t;
word_t CurWord;
/// BitsInCurWord - This is the number of bits in CurWord that are valid. This
/// is always from [0...31/63] inclusive (depending on word size).
/// This is the number of bits in CurWord that are valid. This is always from
/// [0...31/63] inclusive (depending on word size).
unsigned BitsInCurWord;
// CurCodeSize - This is the declared size of code values used for the current
// block, in bits.
// This is the declared size of code values used for the current block, in
// bits.
unsigned CurCodeSize;
/// CurAbbrevs - Abbrevs installed at in this block.
/// Abbrevs installed at in this block.
std::vector<IntrusiveRefCntPtr<BitCodeAbbrev>> CurAbbrevs;
struct Block {
@ -204,7 +194,7 @@ class BitstreamCursor {
explicit Block(unsigned PCS) : PrevCodeSize(PCS) {}
};
/// BlockScope - This tracks the codesize of parent blocks.
/// This tracks the codesize of parent blocks.
SmallVector<Block, 8> BlockScope;
@ -250,10 +240,10 @@ public:
return BitsInCurWord == 0 && isEndPos(NextChar);
}
/// getAbbrevIDWidth - Return the number of bits used to encode an abbrev #.
/// Return the number of bits used to encode an abbrev #.
unsigned getAbbrevIDWidth() const { return CurCodeSize; }
/// GetCurrentBitNo - Return the bit # of the bit we are reading.
/// Return the bit # of the bit we are reading.
uint64_t GetCurrentBitNo() const {
return NextChar*CHAR_BIT - BitsInCurWord;
}
@ -267,19 +257,17 @@ public:
/// Flags that modify the behavior of advance().
enum {
/// 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.
/// If this flag is used, the advance() method does not automatically pop
/// the block scope when the end of a block is reached.
AF_DontPopBlockAtEnd = 1,
/// AF_DontAutoprocessAbbrevs - If this flag is used, abbrev entries are
/// returned just like normal records.
/// If this flag is used, abbrev entries are returned just like normal
/// records.
AF_DontAutoprocessAbbrevs = 2
};
/// advance - Advance the current bitstream, returning the next entry in the
/// stream.
BitstreamEntry advance(unsigned Flags = 0) {
/// Advance the current bitstream, returning the next entry in the stream.
BitstreamEntry advance(unsigned Flags = 0) {
while (1) {
unsigned Code = ReadCode();
if (Code == bitc::END_BLOCK) {
@ -304,8 +292,8 @@ public:
}
}
/// advanceSkippingSubblocks - This is a convenience function for clients that
/// don't expect any subblocks. This just skips over them automatically.
/// This is a convenience function for clients that don't expect any
/// subblocks. This just skips over them automatically.
BitstreamEntry advanceSkippingSubblocks(unsigned Flags = 0) {
while (1) {
// If we found a normal entry, return it.
@ -319,7 +307,7 @@ public:
}
}
/// JumpToBit - Reset the stream to the specified bit number.
/// Reset the stream to the specified bit number.
void JumpToBit(uint64_t BitNo) {
uintptr_t ByteNo = uintptr_t(BitNo/8) & ~(sizeof(word_t)-1);
unsigned WordBitNo = unsigned(BitNo & (sizeof(word_t)*8-1));
@ -417,8 +405,8 @@ public:
}
}
// ReadVBR64 - Read a VBR that may have a value up to 64-bits in size. The
// chunk size of the VBR must still be <= 32 bits though.
// Read a VBR that may have a value up to 64-bits in size. The chunk size of
// the VBR must still be <= 32 bits though.
uint64_t ReadVBR64(unsigned NumBits) {
uint32_t Piece = Read(NumBits);
if ((Piece & (1U << (NumBits-1))) == 0)
@ -461,15 +449,13 @@ public:
// Block header:
// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
/// ReadSubBlockID - Having read the ENTER_SUBBLOCK code, read the BlockID for
/// the block.
/// Having read the ENTER_SUBBLOCK code, read the BlockID for the block.
unsigned ReadSubBlockID() {
return ReadVBR(bitc::BlockIDWidth);
}
/// 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.
/// Having read the ENTER_SUBBLOCK abbrevid and a BlockID, skip over the body
/// of this block. If the block record is malformed, return true.
bool SkipBlock() {
// Read and ignore the codelen value. Since we are skipping this block, we
// don't care what code widths are used inside of it.
@ -487,8 +473,8 @@ public:
return false;
}
/// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, enter
/// the block, and return true if the block has an error.
/// Having read the ENTER_SUBBLOCK abbrevid, enter the block, and return true
/// if the block has an error.
bool EnterSubBlock(unsigned BlockID, unsigned *NumWordsP = nullptr);
bool ReadBlockEnd() {
@ -524,14 +510,14 @@ private:
public:
/// getAbbrev - Return the abbreviation for the specified AbbrevId.
/// Return the abbreviation for the specified AbbrevId.
const BitCodeAbbrev *getAbbrev(unsigned AbbrevID) {
unsigned AbbrevNo = AbbrevID-bitc::FIRST_APPLICATION_ABBREV;
assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
return CurAbbrevs[AbbrevNo].get();
}
/// skipRecord - Read the current record and discard it.
/// Read the current record and discard it.
void skipRecord(unsigned AbbrevID);
unsigned readRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals,