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-rw-r--r--include/llvm/Bitcode/BitCodes.h5
-rw-r--r--include/llvm/Bitcode/BitstreamReader.h102
-rw-r--r--include/llvm/Bitcode/BitstreamWriter.h118
3 files changed, 213 insertions, 12 deletions
diff --git a/include/llvm/Bitcode/BitCodes.h b/include/llvm/Bitcode/BitCodes.h
index d9a5874966..2cf8b7b723 100644
--- a/include/llvm/Bitcode/BitCodes.h
+++ b/include/llvm/Bitcode/BitCodes.h
@@ -66,8 +66,9 @@ namespace bitc {
/// BlockInfoCodes - The blockinfo block contains metadata about user-defined
/// blocks.
enum BlockInfoCodes {
- BLOCKINFO_CODE_SETBID = 1, // SETBID: [blockid#]
- BLOCKINFO_CODE_ABBREV = 2 // ABBREV: [standard abbrev encoding]
+ BLOCKINFO_CODE_SETBID = 1 // SETBID: [blockid#]
+ // DEFINE_ABBREV has magic semantics here, applying to the current SETBID'd
+ // block, instead of the BlockInfo block.
// BLOCKNAME: give string name to block, if desired.
};
diff --git a/include/llvm/Bitcode/BitstreamReader.h b/include/llvm/Bitcode/BitstreamReader.h
index 2a3e412f78..c15c0864e6 100644
--- a/include/llvm/Bitcode/BitstreamReader.h
+++ b/include/llvm/Bitcode/BitstreamReader.h
@@ -48,6 +48,14 @@ class BitstreamReader {
/// BlockScope - This tracks the codesize of parent blocks.
SmallVector<Block, 8> BlockScope;
+ /// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
+ /// These describe abbreviations that all blocks of the specified ID inherit.
+ struct BlockInfo {
+ unsigned BlockID;
+ std::vector<BitCodeAbbrev*> Abbrevs;
+ };
+ std::vector<BlockInfo> BlockInfoRecords;
+
/// FirstChar - This remembers the first byte of the stream.
const unsigned char *FirstChar;
public:
@@ -82,6 +90,15 @@ public:
for (unsigned i = 0, e = Abbrevs.size(); i != e; ++i)
Abbrevs[i]->dropRef();
}
+
+ // Free the BlockInfoRecords.
+ while (!BlockInfoRecords.empty()) {
+ BlockInfo &Info = BlockInfoRecords.back();
+ // Free blockinfo abbrev info.
+ for (unsigned i = 0, e = Info.Abbrevs.size(); i != e; ++i)
+ Info.Abbrevs[i]->dropRef();
+ BlockInfoRecords.pop_back();
+ }
}
bool AtEndOfStream() const { return NextChar == LastChar; }
@@ -206,6 +223,22 @@ public:
// Block Manipulation
//===--------------------------------------------------------------------===//
+private:
+ /// getBlockInfo - If there is block info for the specified ID, return it,
+ /// otherwise return null.
+ BlockInfo *getBlockInfo(unsigned BlockID) {
+ // Common case, the most recent entry matches BlockID.
+ if (!BlockInfoRecords.empty() && BlockInfoRecords.back().BlockID == BlockID)
+ return &BlockInfoRecords.back();
+
+ for (unsigned i = 0, e = BlockInfoRecords.size(); i != e; ++i)
+ if (BlockInfoRecords[i].BlockID == BlockID)
+ return &BlockInfoRecords[i];
+ return 0;
+ }
+public:
+
+
// Block header:
// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
@@ -236,10 +269,19 @@ public:
/// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, read and enter
/// the block, returning the BlockID of the block we just entered.
- bool EnterSubBlock(unsigned *NumWordsP = 0) {
+ bool EnterSubBlock(unsigned BlockID, unsigned *NumWordsP = 0) {
+ // Save the current block's state on BlockScope.
BlockScope.push_back(Block(CurCodeSize));
BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+ // Add the abbrevs specific to this block to the CurAbbrevs list.
+ if (BlockInfo *Info = getBlockInfo(BlockID)) {
+ for (unsigned i = 0, e = Info->Abbrevs.size(); i != e; ++i) {
+ CurAbbrevs.push_back(Info->Abbrevs[i]);
+ CurAbbrevs.back()->addRef();
+ }
+ }
+
// Get the codesize of this block.
CurCodeSize = ReadVBR(bitc::CodeLenWidth);
SkipToWord();
@@ -352,6 +394,64 @@ public:
}
CurAbbrevs.push_back(Abbv);
}
+
+ //===--------------------------------------------------------------------===//
+ // BlockInfo Block Reading
+ //===--------------------------------------------------------------------===//
+
+private:
+ BlockInfo &getOrCreateBlockInfo(unsigned BlockID) {
+ if (BlockInfo *BI = getBlockInfo(BlockID))
+ return *BI;
+
+ // Otherwise, add a new record.
+ BlockInfoRecords.push_back(BlockInfo());
+ BlockInfoRecords.back().BlockID = BlockID;
+ return BlockInfoRecords.back();
+ }
+
+public:
+
+ bool ReadBlockInfoBlock() {
+ if (EnterSubBlock(bitc::BLOCKINFO_BLOCK_ID)) return true;
+
+ SmallVector<uint64_t, 64> Record;
+ BlockInfo *CurBlockInfo = 0;
+
+ // Read all the records for this module.
+ while (1) {
+ unsigned Code = ReadCode();
+ if (Code == bitc::END_BLOCK)
+ return ReadBlockEnd();
+ if (Code == bitc::ENTER_SUBBLOCK) {
+ ReadSubBlockID();
+ if (SkipBlock()) return true;
+ continue;
+ }
+
+ // Read abbrev records, associate them with CurBID.
+ if (Code == bitc::DEFINE_ABBREV) {
+ if (!CurBlockInfo) return true;
+ ReadAbbrevRecord();
+
+ // ReadAbbrevRecord installs the abbrev in CurAbbrevs. Move it to the
+ // appropriate BlockInfo.
+ BitCodeAbbrev *Abbv = CurAbbrevs.back();
+ CurAbbrevs.pop_back();
+ CurBlockInfo->Abbrevs.push_back(Abbv);
+ continue;
+ }
+
+ // Read a record.
+ switch (ReadRecord(Code, Record)) {
+ default: break; // Default behavior, ignore unknown content.
+ case bitc::BLOCKINFO_CODE_SETBID:
+ if (Record.size() < 1) return true;
+ CurBlockInfo = &getOrCreateBlockInfo(Record[0]);
+ break;
+ }
+ }
+ }
};
} // End llvm namespace
diff --git a/include/llvm/Bitcode/BitstreamWriter.h b/include/llvm/Bitcode/BitstreamWriter.h
index b774181628..198a82e287 100644
--- a/include/llvm/Bitcode/BitstreamWriter.h
+++ b/include/llvm/Bitcode/BitstreamWriter.h
@@ -29,10 +29,14 @@ class BitstreamWriter {
/// CurValue - The current value. Only bits < CurBit are valid.
uint32_t CurValue;
- // CurCodeSize - This is the declared size of code values used for the current
- // block, in bits.
+ /// CurCodeSize - This is the declared size of code values used for the
+ /// current block, in bits.
unsigned CurCodeSize;
+ /// BlockInfoCurBID - When emitting a BLOCKINFO_BLOCK, this is the currently
+ /// selected BLOCK ID.
+ unsigned BlockInfoCurBID;
+
/// CurAbbrevs - Abbrevs installed at in this block.
std::vector<BitCodeAbbrev*> CurAbbrevs;
@@ -46,6 +50,14 @@ class BitstreamWriter {
/// BlockScope - This tracks the current blocks that we have entered.
std::vector<Block> BlockScope;
+ /// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
+ /// These describe abbreviations that all blocks of the specified ID inherit.
+ struct BlockInfo {
+ unsigned BlockID;
+ std::vector<BitCodeAbbrev*> Abbrevs;
+ };
+ std::vector<BlockInfo> BlockInfoRecords;
+
public:
BitstreamWriter(std::vector<unsigned char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
@@ -53,6 +65,15 @@ public:
~BitstreamWriter() {
assert(CurBit == 0 && "Unflused data remaining");
assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
+
+ // Free the BlockInfoRecords.
+ while (!BlockInfoRecords.empty()) {
+ BlockInfo &Info = BlockInfoRecords.back();
+ // Free blockinfo abbrev info.
+ for (unsigned i = 0, e = Info.Abbrevs.size(); i != e; ++i)
+ Info.Abbrevs[i]->dropRef();
+ BlockInfoRecords.pop_back();
+ }
}
//===--------------------------------------------------------------------===//
// Basic Primitives for emitting bits to the stream.
@@ -139,6 +160,19 @@ public:
// Block Manipulation
//===--------------------------------------------------------------------===//
+ /// getBlockInfo - If there is block info for the specified ID, return it,
+ /// otherwise return null.
+ BlockInfo *getBlockInfo(unsigned BlockID) {
+ // Common case, the most recent entry matches BlockID.
+ if (!BlockInfoRecords.empty() && BlockInfoRecords.back().BlockID == BlockID)
+ return &BlockInfoRecords.back();
+
+ for (unsigned i = 0, e = BlockInfoRecords.size(); i != e; ++i)
+ if (BlockInfoRecords[i].BlockID == BlockID)
+ return &BlockInfoRecords[i];
+ return 0;
+ }
+
void EnterSubblock(unsigned BlockID, unsigned CodeLen) {
// Block header:
// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
@@ -146,13 +180,28 @@ public:
EmitVBR(BlockID, bitc::BlockIDWidth);
EmitVBR(CodeLen, bitc::CodeLenWidth);
FlushToWord();
- BlockScope.push_back(Block(CurCodeSize, Out.size()/4));
- BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+
+ unsigned BlockSizeWordLoc = Out.size();
+ unsigned OldCodeSize = CurCodeSize;
// Emit a placeholder, which will be replaced when the block is popped.
Emit(0, bitc::BlockSizeWidth);
CurCodeSize = CodeLen;
+
+ // Push the outer block's abbrev set onto the stack, start out with an
+ // empty abbrev set.
+ BlockScope.push_back(Block(OldCodeSize, BlockSizeWordLoc/4));
+ BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+
+ // If there is a blockinfo for this BlockID, add all the predefined abbrevs
+ // to the abbrev list.
+ if (BlockInfo *Info = getBlockInfo(BlockID)) {
+ for (unsigned i = 0, e = Info->Abbrevs.size(); i != e; ++i) {
+ CurAbbrevs.push_back(Info->Abbrevs[i]);
+ Info->Abbrevs[i]->addRef();
+ }
+ }
}
void ExitBlock() {
@@ -261,15 +310,14 @@ public:
EmitVBR64(Vals[i], 6);
}
}
-
+
//===--------------------------------------------------------------------===//
// Abbrev Emission
//===--------------------------------------------------------------------===//
- /// EmitAbbrev - This emits an abbreviation to the stream. Note that this
- /// method takes ownership of the specified abbrev.
- unsigned EmitAbbrev(BitCodeAbbrev *Abbv) {
- // Emit the abbreviation as a record.
+private:
+ // Emit the abbreviation as a DEFINE_ABBREV record.
+ void EncodeAbbrev(BitCodeAbbrev *Abbv) {
EmitCode(bitc::DEFINE_ABBREV);
EmitVBR(Abbv->getNumOperandInfos(), 5);
for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
@@ -283,10 +331,62 @@ public:
EmitVBR64(Op.getEncodingData(), 5);
}
}
+ }
+public:
+ /// EmitAbbrev - This emits an abbreviation to the stream. Note that this
+ /// method takes ownership of the specified abbrev.
+ unsigned EmitAbbrev(BitCodeAbbrev *Abbv) {
+ // Emit the abbreviation as a record.
+ EncodeAbbrev(Abbv);
CurAbbrevs.push_back(Abbv);
return CurAbbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
}
+
+ //===--------------------------------------------------------------------===//
+ // BlockInfo Block Emission
+ //===--------------------------------------------------------------------===//
+
+ /// EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
+ void EnterBlockInfoBlock(unsigned CodeWidth) {
+ EnterSubblock(bitc::BLOCKINFO_BLOCK_ID, CodeWidth);
+ BlockInfoCurBID = -1U;
+ }
+private:
+ /// SwitchToBlockID - If we aren't already talking about the specified block
+ /// ID, emit a BLOCKINFO_CODE_SETBID record.
+ void SwitchToBlockID(unsigned BlockID) {
+ if (BlockInfoCurBID == BlockID) return;
+ SmallVector<unsigned, 2> V;
+ V.push_back(BlockID);
+ EmitRecord(bitc::BLOCKINFO_CODE_SETBID, V);
+ BlockInfoCurBID = BlockID;
+ }
+
+ BlockInfo &getOrCreateBlockInfo(unsigned BlockID) {
+ if (BlockInfo *BI = getBlockInfo(BlockID))
+ return *BI;
+
+ // Otherwise, add a new record.
+ BlockInfoRecords.push_back(BlockInfo());
+ BlockInfoRecords.back().BlockID = BlockID;
+ return BlockInfoRecords.back();
+ }
+
+public:
+
+ /// EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified
+ /// BlockID.
+ unsigned EmitBlockInfoAbbrev(unsigned BlockID, BitCodeAbbrev *Abbv) {
+ SwitchToBlockID(BlockID);
+ EncodeAbbrev(Abbv);
+
+ // Add the abbrev to the specified block record.
+ BlockInfo &Info = getOrCreateBlockInfo(BlockID);
+ Info.Abbrevs.push_back(Abbv);
+
+ return Info.Abbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
+ }
};
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