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Add an API for the bitstream reader to read blobs and return

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them by reference, instead of packing each byte into a
smallvector.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68486 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-04-07 02:56:46 +00:00
parent 683b08cf7c
commit ae7dd8004e
2 changed files with 37 additions and 25 deletions
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21
include/llvm/Bitcode/BitstreamReader.h
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@ -371,7 +371,8 @@ public:
return CurAbbrevs[AbbrevNo];
}
unsigned ReadRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals) {
unsigned ReadRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals,
const char **BlobStart = 0, unsigned *BlobLen = 0) {
if (AbbrevID == bitc::UNABBREV_RECORD) {
unsigned Code = ReadVBR(6);
unsigned NumElts = ReadVBR(6);
@ -413,9 +414,15 @@ public:
break;
}
// Otherwise, read the number of bytes.
for (; NumElts; ++NextChar, --NumElts)
Vals.push_back(*NextChar);
// Otherwise, read the number of bytes. If we can return a reference to
// the data, do so to avoid copying it.
if (BlobStart) {
*BlobStart = (const char*)NextChar;
*BlobLen = NumElts;
} else {
for (; NumElts; ++NextChar, --NumElts)
Vals.push_back(*NextChar);
}
// Skip over tail padding.
NextChar = NewEnd;
} else {
@ -428,6 +435,12 @@ public:
return Code;
}
unsigned ReadRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals,
const char *&BlobStart, unsigned &BlobLen) {
return ReadRecord(AbbrevID, Vals, &BlobStart, &BlobLen);
}
//===--------------------------------------------------------------------===//
// Abbrev Processing
//===--------------------------------------------------------------------===//