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Added "random access" to the Deserializer to allow a client to jump to any

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serialized block in the bitstream, including a block in an entirely different
nesting than the current block. This is useful for deserializing objects from
a bitstream in an order different from the order that they were serialized.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43973 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek
2007-11-10 02:02:34 +00:00
parent 13faf5c13c
commit 1a8a08a690
2 changed files with 153 additions and 10 deletions
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39
include/llvm/Bitcode/Deserialize.h
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@ -80,7 +80,36 @@ class Deserializer {
//===----------------------------------------------------------===//
public:
typedef uint64_t Location;
struct Location {
uint64_t BitNo;
unsigned BlockID;
unsigned NumWords;
Location(uint64_t bit, unsigned bid, unsigned words)
: BitNo(bit), BlockID(bid), NumWords(words) {}
Location() : BitNo(0), BlockID(0), NumWords(0) {}
Location& operator=(Location& RHS) {
BitNo = RHS.BitNo;
BlockID = RHS.BlockID;
NumWords = RHS.NumWords;
return *this;
}
bool operator==(const Location& RHS) const { return BitNo == RHS.BitNo; }
bool operator!=(const Location& RHS) const { return BitNo != RHS.BitNo; }
bool contains(const Location& RHS) const {
if (RHS.BitNo < BitNo)
return false;
if ((RHS.BitNo - BitNo) >> 5 < NumWords)
return true;
return false;
}
};
//===----------------------------------------------------------===//
// Internal data members.
@ -93,9 +122,10 @@ private:
BumpPtrAllocator Allocator;
BPNode* FreeList;
MapTy BPatchMap;
llvm::SmallVector<std::pair<Location,unsigned>,5> BlockStack;
llvm::SmallVector<Location,8> BlockStack;
unsigned AbbrevNo;
unsigned RecordCode;
Location StreamStart;
//===----------------------------------------------------------===//
// Public Interface.
@ -238,13 +268,18 @@ public:
unsigned getAbbrevNo();
bool FinishedBlock(Location BlockLoc);
bool JumpTo(const Location& BlockLoc);
void Rewind() { JumpTo(StreamStart); }
bool AtEnd();
bool inRecord();
void SkipBlock();
bool SkipToBlock(unsigned BlockID);
unsigned getRecordCode();
BitstreamReader& getStream() { return Stream; }
private:
bool AdvanceStream();
void ReadRecord();