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add JumpToBit, an explicit init method, and a default ctor.

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llvm-svn: 36613
This commit is contained in:
Chris Lattner 2007-05-01 04:59:06 +00:00
parent 01a611f06a
commit eb2a5f5f99
1 changed files with 28 additions and 2 deletions
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30
include/llvm/Bitcode/BitstreamReader.h
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@ -51,8 +51,20 @@ class BitstreamReader {
/// FirstChar - This remembers the first byte of the stream.
const unsigned char *FirstChar;
public:
BitstreamReader(const unsigned char *Start, const unsigned char *End)
: NextChar(Start), LastChar(End), FirstChar(Start) {
BitstreamReader() {
NextChar = FirstChar = LastChar = 0;
CurWord = 0;
BitsInCurWord = 0;
CurCodeSize = 0;
}
BitstreamReader(const unsigned char *Start, const unsigned char *End) {
init(Start, End);
}
void init(const unsigned char *Start, const unsigned char *End) {
NextChar = FirstChar = Start;
LastChar = End;
assert(((End-Start) & 3) == 0 &&"Bitcode stream not a multiple of 4 bytes");
CurWord = 0;
BitsInCurWord = 0;
@ -79,6 +91,20 @@ public:
return (NextChar-FirstChar)*8 + (32-BitsInCurWord);
}
/// JumpToBit - Reset the stream to the specified bit number.
void JumpToBit(uint64_t BitNo) {
unsigned WordNo = BitNo/32;
unsigned WordBitNo = BitNo & 31;
assert(WordNo < (unsigned)(LastChar-FirstChar) && "Invalid location");
// Move the cursor to the right word.
NextChar = FirstChar+WordNo;
BitsInCurWord = 0;
// Skip over any bits that are already consumed.
if (WordBitNo) Read(WordBitNo);
}
/// GetAbbrevIDWidth - Return the number of bits used to encode an abbrev #.
unsigned GetAbbrevIDWidth() const { return CurCodeSize; }