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add some helpers

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36580 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-04-29 21:49:05 +00:00
parent b30c925046
commit 8d89f1fbb6
2 changed files with 5 additions and 2 deletions
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5
include/llvm/Bitcode/BitstreamReader.h
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@ -79,6 +79,8 @@ public:
return (NextChar-FirstChar)*8 + (32-BitsInCurWord);
}
/// GetAbbrevIDWidth - Return the number of bits used to encode an abbrev #.
unsigned GetAbbrevIDWidth() const { return CurCodeSize; }
uint32_t Read(unsigned NumBits) {
// If the field is fully contained by CurWord, return it quickly.
@ -205,7 +207,7 @@ public:
/// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, read and enter
/// the block, returning the BlockID of the block we just entered.
bool EnterSubBlock() {
bool EnterSubBlock(unsigned *NumWordsP = 0) {
BlockScope.push_back(Block(CurCodeSize));
BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
@ -213,6 +215,7 @@ public:
CurCodeSize = ReadVBR(bitc::CodeLenWidth);
SkipToWord();
unsigned NumWords = Read(bitc::BlockSizeWidth);
if (NumWordsP) *NumWordsP = NumWords;
// Validate that this block is sane.
if (CurCodeSize == 0 || AtEndOfStream() || NextChar+NumWords*4 > LastChar)