//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
-#ifndef BITSTREAM_WRITER_H
-#define BITSTREAM_WRITER_H
+#ifndef LLVM_BITCODE_BITSTREAMWRITER_H
+#define LLVM_BITCODE_BITSTREAMWRITER_H
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
#include "llvm/Bitcode/BitCodes.h"
+#include "llvm/Support/Endian.h"
#include <vector>
namespace llvm {
class BitstreamWriter {
- std::vector<unsigned char> &Out;
+ SmallVectorImpl<char> &Out;
/// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
unsigned CurBit;
-
+
/// 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<IntrusiveRefCntPtr<BitCodeAbbrev>> CurAbbrevs;
+
struct Block {
unsigned PrevCodeSize;
unsigned StartSizeWord;
- std::vector<BitCodeAbbrev*> PrevAbbrevs;
+ std::vector<IntrusiveRefCntPtr<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;
-
- std::vector<BitCodeAbbrev*> CurAbbrevs;
+
+ /// 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<IntrusiveRefCntPtr<BitCodeAbbrev>> Abbrevs;
+ };
+ std::vector<BlockInfo> BlockInfoRecords;
+
+ // BackpatchWord - Backpatch a 32-bit word in the output with the specified
+ // value.
+ void BackpatchWord(unsigned ByteNo, unsigned NewWord) {
+ support::endian::write32le(&Out[ByteNo], NewWord);
+ }
+
+ void WriteByte(unsigned char Value) {
+ Out.push_back(Value);
+ }
+
+ void WriteWord(unsigned Value) {
+ Value = support::endian::byte_swap<uint32_t, support::little>(Value);
+ Out.append(reinterpret_cast<const char *>(&Value),
+ reinterpret_cast<const char *>(&Value + 1));
+ }
+
+ unsigned GetBufferOffset() const {
+ return Out.size();
+ }
+
+ unsigned GetWordIndex() const {
+ unsigned Offset = GetBufferOffset();
+ assert((Offset & 3) == 0 && "Not 32-bit aligned");
+ return Offset / 4;
+ }
+
public:
- BitstreamWriter(std::vector<unsigned char> &O)
+ explicit BitstreamWriter(SmallVectorImpl<char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
~BitstreamWriter() {
- assert(CurBit == 0 && "Unflused data remaining");
- assert(BlockScope.empty() && "Block imbalance");
+ assert(CurBit == 0 && "Unflushed data remaining");
+ assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
}
+
+ /// \brief Retrieve the current position in the stream, in bits.
+ uint64_t GetCurrentBitNo() const { return GetBufferOffset() * 8 + CurBit; }
+
//===--------------------------------------------------------------------===//
// Basic Primitives for emitting bits to the stream.
//===--------------------------------------------------------------------===//
-
+
void Emit(uint32_t Val, unsigned NumBits) {
- assert(NumBits <= 32 && "Invalid value size!");
+ assert(NumBits && NumBits <= 32 && "Invalid value size!");
assert((Val & ~(~0U >> (32-NumBits))) == 0 && "High bits set!");
CurValue |= Val << CurBit;
if (CurBit + NumBits < 32) {
CurBit += NumBits;
return;
}
-
+
// Add the current word.
- unsigned V = CurValue;
- Out.push_back((unsigned char)(V >> 0));
- Out.push_back((unsigned char)(V >> 8));
- Out.push_back((unsigned char)(V >> 16));
- Out.push_back((unsigned char)(V >> 24));
-
+ WriteWord(CurValue);
+
if (CurBit)
CurValue = Val >> (32-CurBit);
else
CurValue = 0;
CurBit = (CurBit+NumBits) & 31;
}
-
+
void Emit64(uint64_t Val, unsigned NumBits) {
if (NumBits <= 32)
Emit((uint32_t)Val, NumBits);
Emit((uint32_t)(Val >> 32), NumBits-32);
}
}
-
+
void FlushToWord() {
if (CurBit) {
- unsigned V = CurValue;
- Out.push_back((unsigned char)(V >> 0));
- Out.push_back((unsigned char)(V >> 8));
- Out.push_back((unsigned char)(V >> 16));
- Out.push_back((unsigned char)(V >> 24));
+ WriteWord(CurValue);
CurBit = 0;
CurValue = 0;
}
}
-
+
void EmitVBR(uint32_t Val, unsigned NumBits) {
+ assert(NumBits <= 32 && "Too many bits to emit!");
uint32_t Threshold = 1U << (NumBits-1);
-
+
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
while (Val >= Threshold) {
Emit((Val & ((1 << (NumBits-1))-1)) | (1 << (NumBits-1)), NumBits);
Val >>= NumBits-1;
}
-
+
Emit(Val, NumBits);
}
-
+
void EmitVBR64(uint64_t Val, unsigned NumBits) {
+ assert(NumBits <= 32 && "Too many bits to emit!");
if ((uint32_t)Val == Val)
return EmitVBR((uint32_t)Val, NumBits);
-
- uint64_t Threshold = 1U << (NumBits-1);
-
+
+ uint32_t Threshold = 1U << (NumBits-1);
+
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
while (Val >= Threshold) {
Emit(((uint32_t)Val & ((1 << (NumBits-1))-1)) |
(1 << (NumBits-1)), NumBits);
Val >>= NumBits-1;
}
-
+
Emit((uint32_t)Val, NumBits);
}
-
+
/// EmitCode - Emit the specified code.
void EmitCode(unsigned Val) {
Emit(Val, CurCodeSize);
}
-
+
//===--------------------------------------------------------------------===//
// 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 = static_cast<unsigned>(BlockInfoRecords.size());
+ i != e; ++i)
+ if (BlockInfoRecords[i].BlockID == BlockID)
+ return &BlockInfoRecords[i];
+ return nullptr;
+ }
+
void EnterSubblock(unsigned BlockID, unsigned CodeLen) {
// Block header:
// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
EmitVBR(BlockID, bitc::BlockIDWidth);
EmitVBR(CodeLen, bitc::CodeLenWidth);
FlushToWord();
- BlockScope.push_back(Block(CurCodeSize, Out.size()/4));
-
- // Delete all abbrevs.
- for (unsigned i = 0, e = CurAbbrevs.size(); i != e; ++i)
- delete CurAbbrevs[i];
-
- BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+
+ unsigned BlockSizeWordIndex = GetWordIndex();
+ 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.emplace_back(OldCodeSize, BlockSizeWordIndex);
+ 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)) {
+ CurAbbrevs.insert(CurAbbrevs.end(), Info->Abbrevs.begin(),
+ Info->Abbrevs.end());
+ }
}
-
+
void ExitBlock() {
assert(!BlockScope.empty() && "Block scope imbalance!");
const Block &B = BlockScope.back();
-
+
// Block tail:
// [END_BLOCK, <align4bytes>]
EmitCode(bitc::END_BLOCK);
FlushToWord();
// Compute the size of the block, in words, not counting the size field.
- unsigned SizeInWords = Out.size()/4-B.StartSizeWord - 1;
+ unsigned SizeInWords = GetWordIndex() - B.StartSizeWord - 1;
unsigned ByteNo = B.StartSizeWord*4;
-
+
// Update the block size field in the header of this sub-block.
- Out[ByteNo++] = (unsigned char)(SizeInWords >> 0);
- Out[ByteNo++] = (unsigned char)(SizeInWords >> 8);
- Out[ByteNo++] = (unsigned char)(SizeInWords >> 16);
- Out[ByteNo++] = (unsigned char)(SizeInWords >> 24);
-
+ BackpatchWord(ByteNo, SizeInWords);
+
// Restore the inner block's code size and abbrev table.
CurCodeSize = B.PrevCodeSize;
- BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
+ CurAbbrevs = std::move(B.PrevAbbrevs);
BlockScope.pop_back();
}
-
+
//===--------------------------------------------------------------------===//
// Record Emission
//===--------------------------------------------------------------------===//
-
- /// EmitRecord - Emit the specified record to the stream, using an abbrev if
- /// we have one to compress the output.
- void EmitRecord(unsigned Code, SmallVectorImpl<uint64_t> &Vals,
- unsigned Abbrev = 0) {
- if (Abbrev) {
- unsigned AbbrevNo = Abbrev-bitc::FIRST_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) {
+
+private:
+ /// EmitAbbreviatedLiteral - Emit a literal value according to its abbrev
+ /// record. This is a no-op, since the abbrev specifies the literal to use.
+ template<typename uintty>
+ void EmitAbbreviatedLiteral(const BitCodeAbbrevOp &Op, uintty V) {
+ assert(Op.isLiteral() && "Not a literal");
+ // If the abbrev specifies the literal value to use, don't emit
+ // anything.
+ assert(V == Op.getLiteralValue() &&
+ "Invalid abbrev for record!");
+ }
+
+ /// EmitAbbreviatedField - Emit a single scalar field value with the specified
+ /// encoding.
+ template<typename uintty>
+ void EmitAbbreviatedField(const BitCodeAbbrevOp &Op, uintty V) {
+ assert(!Op.isLiteral() && "Literals should use EmitAbbreviatedLiteral!");
+
+ // Encode the value as we are commanded.
+ switch (Op.getEncoding()) {
+ default: llvm_unreachable("Unknown encoding!");
+ case BitCodeAbbrevOp::Fixed:
+ if (Op.getEncodingData())
+ Emit((unsigned)V, (unsigned)Op.getEncodingData());
+ break;
+ case BitCodeAbbrevOp::VBR:
+ if (Op.getEncodingData())
+ EmitVBR64(V, (unsigned)Op.getEncodingData());
+ break;
+ case BitCodeAbbrevOp::Char6:
+ Emit(BitCodeAbbrevOp::EncodeChar6((char)V), 6);
+ break;
+ }
+ }
+
+ /// EmitRecordWithAbbrevImpl - This is the core implementation of the record
+ /// emission code. If BlobData is non-null, then it specifies an array of
+ /// data that should be emitted as part of the Blob or Array operand that is
+ /// known to exist at the end of the record. If Code is specified, then
+ /// it is the record code to emit before the Vals, which must not contain
+ /// the code.
+ template<typename uintty>
+ void EmitRecordWithAbbrevImpl(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ StringRef Blob, Optional<unsigned> Code) {
+ const char *BlobData = Blob.data();
+ unsigned BlobLen = (unsigned) Blob.size();
+ unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
+ assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
+ const BitCodeAbbrev *Abbv = CurAbbrevs[AbbrevNo].get();
+
+ EmitCode(Abbrev);
+
+ unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
+ if (Code) {
+ assert(e && "Expected non-empty abbreviation");
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i++);
+
+ if (Op.isLiteral())
+ EmitAbbreviatedLiteral(Op, Code.getValue());
+ else {
+ assert(Op.getEncoding() != BitCodeAbbrevOp::Array &&
+ Op.getEncoding() != BitCodeAbbrevOp::Blob &&
+ "Expected literal or scalar");
+ EmitAbbreviatedField(Op, Code.getValue());
+ }
+ }
+
+ unsigned RecordIdx = 0;
+ for (; i != e; ++i) {
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
+ if (Op.isLiteral()) {
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;
+ EmitAbbreviatedLiteral(Op, Vals[RecordIdx]);
+ ++RecordIdx;
+ } else if (Op.getEncoding() == BitCodeAbbrevOp::Array) {
+ // Array case.
+ assert(i + 2 == e && "array op not second to last?");
+ const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
+
+ // If this record has blob data, emit it, otherwise we must have record
+ // entries to encode this way.
+ if (BlobData) {
+ assert(RecordIdx == Vals.size() &&
+ "Blob data and record entries specified for array!");
+ // Emit a vbr6 to indicate the number of elements present.
+ EmitVBR(static_cast<uint32_t>(BlobLen), 6);
+
+ // Emit each field.
+ for (unsigned i = 0; i != BlobLen; ++i)
+ EmitAbbreviatedField(EltEnc, (unsigned char)BlobData[i]);
+
+ // Know that blob data is consumed for assertion below.
+ BlobData = nullptr;
+ } else {
+ // Emit a vbr6 to indicate the number of elements present.
+ EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
+
+ // Emit each field.
+ for (unsigned e = Vals.size(); RecordIdx != e; ++RecordIdx)
+ EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
+ }
+ } else if (Op.getEncoding() == BitCodeAbbrevOp::Blob) {
+ // If this record has blob data, emit it, otherwise we must have record
+ // entries to encode this way.
+
+ // Emit a vbr6 to indicate the number of elements present.
+ if (BlobData) {
+ EmitVBR(static_cast<uint32_t>(BlobLen), 6);
+ assert(RecordIdx == Vals.size() &&
+ "Blob data and record entries specified for blob operand!");
} 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;
+ EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
+ }
+
+ // Flush to a 32-bit alignment boundary.
+ FlushToWord();
+
+ // Emit each field as a literal byte.
+ if (BlobData) {
+ for (unsigned i = 0; i != BlobLen; ++i)
+ WriteByte((unsigned char)BlobData[i]);
+
+ // Know that blob data is consumed for assertion below.
+ BlobData = nullptr;
+ } else {
+ for (unsigned e = Vals.size(); RecordIdx != e; ++RecordIdx) {
+ assert(isUInt<8>(Vals[RecordIdx]) &&
+ "Value too large to emit as blob");
+ WriteByte((unsigned char)Vals[RecordIdx]);
}
}
+
+ // Align end to 32-bits.
+ while (GetBufferOffset() & 3)
+ WriteByte(0);
+ } else { // Single scalar field.
+ assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
+ EmitAbbreviatedField(Op, Vals[RecordIdx]);
+ ++RecordIdx;
}
- 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.
- EmitCode(bitc::UNABBREV_RECORD);
- EmitVBR(Code, 6);
- EmitVBR(Vals.size(), 6);
- for (unsigned i = 0, e = Vals.size(); i != e; ++i)
- EmitVBR64(Vals[i], 6);
}
+ assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
+ assert(BlobData == nullptr &&
+ "Blob data specified for record that doesn't use it!");
}
-
+
+public:
+
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
/// we have one to compress the output.
- void EmitRecord(unsigned Code, SmallVectorImpl<unsigned> &Vals,
+ template<typename uintty>
+ void EmitRecord(unsigned Code, SmallVectorImpl<uintty> &Vals,
unsigned Abbrev = 0) {
- if (Abbrev) {
- unsigned AbbrevNo = Abbrev-bitc::FIRST_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 (!Abbrev) {
// If we don't have an abbrev to use, emit this in its fully unabbreviated
// form.
EmitCode(bitc::UNABBREV_RECORD);
EmitVBR(Code, 6);
- EmitVBR(Vals.size(), 6);
- for (unsigned i = 0, e = Vals.size(); i != e; ++i)
- EmitVBR(Vals[i], 6);
+ EmitVBR(static_cast<uint32_t>(Vals.size()), 6);
+ for (unsigned i = 0, e = static_cast<unsigned>(Vals.size()); i != e; ++i)
+ EmitVBR64(Vals[i], 6);
+ return;
}
+
+ EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(), Code);
+ }
+
+ /// EmitRecordWithAbbrev - Emit a record with the specified abbreviation.
+ /// Unlike EmitRecord, the code for the record should be included in Vals as
+ /// the first entry.
+ template<typename uintty>
+ void EmitRecordWithAbbrev(unsigned Abbrev, SmallVectorImpl<uintty> &Vals) {
+ EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(), None);
}
-
+
+ /// EmitRecordWithBlob - Emit the specified record to the stream, using an
+ /// abbrev that includes a blob at the end. The blob data to emit is
+ /// specified by the pointer and length specified at the end. In contrast to
+ /// EmitRecord, this routine expects that the first entry in Vals is the code
+ /// of the record.
+ template<typename uintty>
+ void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ StringRef Blob) {
+ EmitRecordWithAbbrevImpl(Abbrev, Vals, Blob, None);
+ }
+ template<typename uintty>
+ void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ const char *BlobData, unsigned BlobLen) {
+ return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(BlobData, BlobLen),
+ None);
+ }
+
+ /// EmitRecordWithArray - Just like EmitRecordWithBlob, works with records
+ /// that end with an array.
+ template<typename uintty>
+ void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ StringRef Array) {
+ EmitRecordWithAbbrevImpl(Abbrev, Vals, Array, None);
+ }
+ template<typename uintty>
+ void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ const char *ArrayData, unsigned ArrayLen) {
+ return EmitRecordWithAbbrevImpl(Abbrev, Vals,
+ StringRef(ArrayData, ArrayLen), None);
+ }
+
//===--------------------------------------------------------------------===//
// 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) {
+ for (unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
+ i != e; ++i) {
const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
Emit(Op.isLiteral(), 1);
if (Op.isLiteral()) {
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_ABBREV;
+ return static_cast<unsigned>(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 = ~0U;
+ }
+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.emplace_back();
+ 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;
}
};
projects / oota-llvm.git / blobdiff