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make BitstreamCursor's copyable and assignable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70159 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-04-26 21:07:02 +00:00
parent 962dde3cef
commit 7919b966a8
1 changed files with 38 additions and 2 deletions
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40
include/llvm/Bitcode/BitstreamReader.h
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@ -71,6 +71,11 @@ 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.
bool hasBlockInfoRecords() const { return !BlockInfoRecords.empty(); }
/// getBlockInfo - If there is block info for the specified ID, return it,
/// otherwise return null.
BlockInfo *getBlockInfo(unsigned BlockID) {
@ -126,11 +131,13 @@ class BitstreamCursor {
/// BlockScope - This tracks the codesize of parent blocks.
SmallVector<Block, 8> BlockScope;
BitstreamCursor(const BitstreamCursor&); // NOT YET IMPLEMENTED.
void operator=(const BitstreamCursor&); // NOT YET IMPLEMENTED.
public:
BitstreamCursor() : BitStream(0), NextChar(0) {
}
BitstreamCursor(const BitstreamCursor &RHS) : BitStream(0), NextChar(0) {
operator=(RHS);
}
explicit BitstreamCursor(BitstreamReader &R) : BitStream(&R) {
NextChar = R.getFirstChar();
assert(NextChar && "Bitstream not initialized yet");
@ -154,6 +161,31 @@ public:
freeState();
}
void operator=(const BitstreamCursor &RHS) {
freeState();
BitStream = RHS.BitStream;
NextChar = RHS.NextChar;
CurWord = RHS.CurWord;
BitsInCurWord = RHS.BitsInCurWord;
CurCodeSize = RHS.CurCodeSize;
// Copy abbreviations, and bump ref counts.
CurAbbrevs = RHS.CurAbbrevs;
for (unsigned i = 0, e = static_cast<unsigned>(CurAbbrevs.size());
i != e; ++i)
CurAbbrevs[i]->addRef();
// Copy block scope and bump ref counts.
for (unsigned S = 0, e = static_cast<unsigned>(BlockScope.size());
S != e; ++S) {
std::vector<BitCodeAbbrev*> &Abbrevs = BlockScope[S].PrevAbbrevs;
for (unsigned i = 0, e = static_cast<unsigned>(Abbrevs.size());
i != e; ++i)
Abbrevs[i]->addRef();
}
}
void freeState() {
// Free all the Abbrevs.
for (unsigned i = 0, e = static_cast<unsigned>(CurAbbrevs.size());
@ -512,6 +544,10 @@ public:
public:
bool ReadBlockInfoBlock() {
// If this is the second stream to get to the block info block, skip it.
if (BitStream->hasBlockInfoRecords())
return SkipBlock();
if (EnterSubBlock(bitc::BLOCKINFO_BLOCK_ID)) return true;
SmallVector<uint64_t, 64> Record;