#define BITSTREAM_WRITER_H
#include "llvm/Bitcode/BitCodes.h"
-#include "llvm/ADT/SmallVector.h"
-#include <cassert>
#include <vector>
namespace llvm {
// CurCodeSize - This is the declared size of code values used for the current
// block, in bits.
unsigned CurCodeSize;
-
+
+ /// CurAbbrevs - Abbrevs installed at in this block.
+ std::vector<BitCodeAbbrev*> CurAbbrevs;
+
struct Block {
unsigned PrevCodeSize;
unsigned StartSizeWord;
+ std::vector<BitCodeAbbrev*> PrevAbbrevs;
Block(unsigned PCS, unsigned SSW) : PrevCodeSize(PCS), StartSizeWord(SSW) {}
};
/// BlockScope - This tracks the current blocks that we have entered.
std::vector<Block> BlockScope;
+
public:
BitstreamWriter(std::vector<unsigned char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
~BitstreamWriter() {
assert(CurBit == 0 && "Unflused data remaining");
- assert(BlockScope.empty() && "Block imbalance");
+ assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
}
//===--------------------------------------------------------------------===//
// Basic Primitives for emitting bits to the stream.
Out.push_back((unsigned char)(V >> 24));
if (CurBit)
- CurValue = Val >> 32-CurBit;
+ CurValue = Val >> (32-CurBit);
else
CurValue = 0;
CurBit = (CurBit+NumBits) & 31;
EmitVBR(CodeLen, bitc::CodeLenWidth);
FlushToWord();
BlockScope.push_back(Block(CurCodeSize, Out.size()/4));
+ BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+
// Emit a placeholder, which will be replaced when the block is popped.
Emit(0, bitc::BlockSizeWidth);
void ExitBlock() {
assert(!BlockScope.empty() && "Block scope imbalance!");
- Block B = BlockScope.back();
- BlockScope.pop_back();
+
+ // Delete all abbrevs.
+ for (unsigned i = 0, e = CurAbbrevs.size(); i != e; ++i)
+ CurAbbrevs[i]->dropRef();
+
+ const Block &B = BlockScope.back();
// Block tail:
// [END_BLOCK, <align4bytes>]
Out[ByteNo++] = (unsigned char)(SizeInWords >> 16);
Out[ByteNo++] = (unsigned char)(SizeInWords >> 24);
- // Restore the outer block's code size.
+ // Restore the inner block's code size and abbrev table.
CurCodeSize = B.PrevCodeSize;
+ BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+ BlockScope.pop_back();
}
//===--------------------------------------------------------------------===//
void EmitRecord(unsigned Code, SmallVectorImpl<uint64_t> &Vals,
unsigned Abbrev = 0) {
if (Abbrev) {
- assert(0 && "abbrevs not implemented yet!");
+ unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
+ assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
+ BitCodeAbbrev *Abbv = CurAbbrevs[AbbrevNo];
+
+ EmitCode(Abbrev);
+
+ // Insert the code into Vals to treat it uniformly.
+ Vals.insert(Vals.begin(), Code);
+
+ unsigned RecordIdx = 0;
+ for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
+ assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
+ uint64_t RecordVal = Vals[RecordIdx];
+
+ if (Op.isLiteral()) {
+ // If the abbrev specifies the literal value to use, don't emit
+ // anything.
+ assert(RecordVal == Op.getLiteralValue() &&
+ "Invalid abbrev for record!");
+ ++RecordIdx;
+ } else {
+ // Encode the value as we are commanded.
+ switch (Op.getEncoding()) {
+ default: assert(0 && "Unknown encoding!");
+ case BitCodeAbbrevOp::FixedWidth:
+ Emit64(RecordVal, Op.getEncodingData());
+ ++RecordIdx;
+ break;
+ case BitCodeAbbrevOp::VBR:
+ EmitVBR64(RecordVal, Op.getEncodingData());
+ ++RecordIdx;
+ break;
+ }
+ }
+ }
+ assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
} else {
// If we don't have an abbrev to use, emit this in its fully unabbreviated
// form.
void EmitRecord(unsigned Code, SmallVectorImpl<unsigned> &Vals,
unsigned Abbrev = 0) {
if (Abbrev) {
- assert(0 && "abbrevs not implemented yet!");
+ unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
+ assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
+ BitCodeAbbrev *Abbv = CurAbbrevs[AbbrevNo];
+
+ EmitCode(Abbrev);
+
+ // Insert the code into Vals to treat it uniformly.
+ Vals.insert(Vals.begin(), Code);
+
+ unsigned RecordIdx = 0;
+ for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
+ assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
+ unsigned RecordVal = Vals[RecordIdx];
+
+ if (Op.isLiteral()) {
+ // If the abbrev specifies the literal value to use, don't emit
+ // anything.
+ assert(RecordVal == Op.getLiteralValue() &&
+ "Invalid abbrev for record!");
+ ++RecordIdx;
+ } else {
+ // Encode the value as we are commanded.
+ switch (Op.getEncoding()) {
+ default: assert(0 && "Unknown encoding!");
+ case BitCodeAbbrevOp::FixedWidth:
+ Emit(RecordVal, Op.getEncodingData());
+ ++RecordIdx;
+ break;
+ case BitCodeAbbrevOp::VBR:
+ EmitVBR(RecordVal, Op.getEncodingData());
+ ++RecordIdx;
+ break;
+ }
+ }
+ }
+ assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
} else {
// If we don't have an abbrev to use, emit this in its fully unabbreviated
// form.
EmitVBR(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.
+ EmitCode(bitc::DEFINE_ABBREV);
+ EmitVBR(Abbv->getNumOperandInfos(), 5);
+ for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
+ Emit(Op.isLiteral(), 1);
+ if (Op.isLiteral()) {
+ EmitVBR64(Op.getLiteralValue(), 8);
+ } else {
+ Emit(Op.getEncoding(), 3);
+ if (Op.hasEncodingData())
+ EmitVBR64(Op.getEncodingData(), 5);
+ }
+ }
+
+ CurAbbrevs.push_back(Abbv);
+ return CurAbbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
+ }
};
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