vendor/llvm/llvm-trunk-r366426

1 files changed, 0 insertions, 550 deletions

diff --git a/include/llvm/Bitcode/BitstreamWriter.h b/include/llvm/Bitcode/BitstreamWriter.h
deleted file mode 100644
index c854769e0622..000000000000
--- a/include/llvm/Bitcode/BitstreamWriter.h
+++ /dev/null
@@ -1,550 +0,0 @@
-//===- BitstreamWriter.h - Low-level bitstream writer interface -*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This header defines the BitstreamWriter class.  This class can be used to
-// write an arbitrary bitstream, regardless of its contents.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_BITCODE_BITSTREAMWRITER_H
-#define LLVM_BITCODE_BITSTREAMWRITER_H
-
-#include "llvm/ADT/ArrayRef.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 {
-  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.
-  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<std::shared_ptr<BitCodeAbbrev>> CurAbbrevs;
-
-  struct Block {
-    unsigned PrevCodeSize;
-    size_t StartSizeWord;
-    std::vector<std::shared_ptr<BitCodeAbbrev>> PrevAbbrevs;
-    Block(unsigned PCS, size_t SSW) : PrevCodeSize(PCS), StartSizeWord(SSW) {}
-  };
-
-  /// 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<std::shared_ptr<BitCodeAbbrev>> Abbrevs;
-  };
-  std::vector<BlockInfo> BlockInfoRecords;
-
-  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));
-  }
-
-  size_t GetBufferOffset() const { return Out.size(); }
-
-  size_t GetWordIndex() const {
-    size_t Offset = GetBufferOffset();
-    assert((Offset & 3) == 0 && "Not 32-bit aligned");
-    return Offset / 4;
-  }
-
-public:
-  explicit BitstreamWriter(SmallVectorImpl<char> &O)
-    : Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
-
-  ~BitstreamWriter() {
-    assert(CurBit == 0 && "Unflushed data remaining");
-    assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
-  }
-
-  /// Retrieve the current position in the stream, in bits.
-  uint64_t GetCurrentBitNo() const { return GetBufferOffset() * 8 + CurBit; }
-
-  /// Retrieve the number of bits currently used to encode an abbrev ID.
-  unsigned GetAbbrevIDWidth() const { return CurCodeSize; }
-
-  //===--------------------------------------------------------------------===//
-  // Basic Primitives for emitting bits to the stream.
-  //===--------------------------------------------------------------------===//
-
-  /// Backpatch a 32-bit word in the output at the given bit offset
-  /// with the specified value.
-  void BackpatchWord(uint64_t BitNo, unsigned NewWord) {
-    using namespace llvm::support;
-    unsigned ByteNo = BitNo / 8;
-    assert((!endian::readAtBitAlignment<uint32_t, little, unaligned>(
-               &Out[ByteNo], BitNo & 7)) &&
-           "Expected to be patching over 0-value placeholders");
-    endian::writeAtBitAlignment<uint32_t, little, unaligned>(
-        &Out[ByteNo], NewWord, BitNo & 7);
-  }
-
-  void BackpatchWord64(uint64_t BitNo, uint64_t Val) {
-    BackpatchWord(BitNo, (uint32_t)Val);
-    BackpatchWord(BitNo + 32, (uint32_t)(Val >> 32));
-  }
-
-  void Emit(uint32_t Val, unsigned NumBits) {
-    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.
-    WriteWord(CurValue);
-
-    if (CurBit)
-      CurValue = Val >> (32-CurBit);
-    else
-      CurValue = 0;
-    CurBit = (CurBit+NumBits) & 31;
-  }
-
-  void FlushToWord() {
-    if (CurBit) {
-      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);
-
-    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]
-    EmitCode(bitc::ENTER_SUBBLOCK);
-    EmitVBR(BlockID, bitc::BlockIDWidth);
-    EmitVBR(CodeLen, bitc::CodeLenWidth);
-    FlushToWord();
-
-    size_t 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.
-    size_t SizeInWords = GetWordIndex() - B.StartSizeWord - 1;
-    uint64_t BitNo = uint64_t(B.StartSizeWord) * 32;
-
-    // Update the block size field in the header of this sub-block.
-    BackpatchWord(BitNo, SizeInWords);
-
-    // Restore the inner block's code size and abbrev table.
-    CurCodeSize = B.PrevCodeSize;
-    CurAbbrevs = std::move(B.PrevAbbrevs);
-    BlockScope.pop_back();
-  }
-
-  //===--------------------------------------------------------------------===//
-  // Record Emission
-  //===--------------------------------------------------------------------===//
-
-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, ArrayRef<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");
-        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.
-
-        if (BlobData) {
-          assert(RecordIdx == Vals.size() &&
-                 "Blob data and record entries specified for blob operand!");
-
-          assert(Blob.data() == BlobData && "BlobData got moved");
-          assert(Blob.size() == BlobLen && "BlobLen got changed");
-          emitBlob(Blob);
-          BlobData = nullptr;
-        } else {
-          emitBlob(Vals.slice(RecordIdx));
-        }
-      } 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!");
-    assert(BlobData == nullptr &&
-           "Blob data specified for record that doesn't use it!");
-  }
-
-public:
-  /// Emit a blob, including flushing before and tail-padding.
-  template <class UIntTy>
-  void emitBlob(ArrayRef<UIntTy> Bytes, bool ShouldEmitSize = true) {
-    // Emit a vbr6 to indicate the number of elements present.
-    if (ShouldEmitSize)
-      EmitVBR(static_cast<uint32_t>(Bytes.size()), 6);
-
-    // Flush to a 32-bit alignment boundary.
-    FlushToWord();
-
-    // Emit literal bytes.
-    for (const auto &B : Bytes) {
-      assert(isUInt<8>(B) && "Value too large to emit as byte");
-      WriteByte((unsigned char)B);
-    }
-
-    // Align end to 32-bits.
-    while (GetBufferOffset() & 3)
-      WriteByte(0);
-  }
-  void emitBlob(StringRef Bytes, bool ShouldEmitSize = true) {
-    emitBlob(makeArrayRef((const uint8_t *)Bytes.data(), Bytes.size()),
-             ShouldEmitSize);
-  }
-
-  /// EmitRecord - Emit the specified record to the stream, using an abbrev if
-  /// we have one to compress the output.
-  template <typename Container>
-  void EmitRecord(unsigned Code, const Container &Vals, unsigned Abbrev = 0) {
-    if (!Abbrev) {
-      // If we don't have an abbrev to use, emit this in its fully unabbreviated
-      // form.
-      auto Count = static_cast<uint32_t>(makeArrayRef(Vals).size());
-      EmitCode(bitc::UNABBREV_RECORD);
-      EmitVBR(Code, 6);
-      EmitVBR(Count, 6);
-      for (unsigned i = 0, e = Count; i != e; ++i)
-        EmitVBR64(Vals[i], 6);
-      return;
-    }
-
-    EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(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 Container>
-  void EmitRecordWithAbbrev(unsigned Abbrev, const Container &Vals) {
-    EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(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 Container>
-  void EmitRecordWithBlob(unsigned Abbrev, const Container &Vals,
-                          StringRef Blob) {
-    EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), Blob, None);
-  }
-  template <typename Container>
-  void EmitRecordWithBlob(unsigned Abbrev, const Container &Vals,
-                          const char *BlobData, unsigned BlobLen) {
-    return EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals),
-                                    StringRef(BlobData, BlobLen), None);
-  }
-
-  /// EmitRecordWithArray - Just like EmitRecordWithBlob, works with records
-  /// that end with an array.
-  template <typename Container>
-  void EmitRecordWithArray(unsigned Abbrev, const Container &Vals,
-                           StringRef Array) {
-    EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), Array, None);
-  }
-  template <typename Container>
-  void EmitRecordWithArray(unsigned Abbrev, const Container &Vals,
-                           const char *ArrayData, unsigned ArrayLen) {
-    return EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals),
-                                    StringRef(ArrayData, ArrayLen), None);
-  }
-
-  //===--------------------------------------------------------------------===//
-  // Abbrev Emission
-  //===--------------------------------------------------------------------===//
-
-private:
-  // Emit the abbreviation as a DEFINE_ABBREV record.
-  void EncodeAbbrev(const BitCodeAbbrev &Abbv) {
-    EmitCode(bitc::DEFINE_ABBREV);
-    EmitVBR(Abbv.getNumOperandInfos(), 5);
-    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.getLiteralValue(), 8);
-      } else {
-        Emit(Op.getEncoding(), 3);
-        if (Op.hasEncodingData())
-          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(std::shared_ptr<BitCodeAbbrev> Abbv) {
-    // Emit the abbreviation as a record.
-    EncodeAbbrev(*Abbv);
-    CurAbbrevs.push_back(std::move(Abbv));
-    return static_cast<unsigned>(CurAbbrevs.size())-1 +
-      bitc::FIRST_APPLICATION_ABBREV;
-  }
-
-  //===--------------------------------------------------------------------===//
-  // BlockInfo Block Emission
-  //===--------------------------------------------------------------------===//
-
-  /// EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
-  void EnterBlockInfoBlock() {
-    EnterSubblock(bitc::BLOCKINFO_BLOCK_ID, 2);
-    BlockInfoCurBID = ~0U;
-    BlockInfoRecords.clear();
-  }
-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, std::shared_ptr<BitCodeAbbrev> Abbv) {
-    SwitchToBlockID(BlockID);
-    EncodeAbbrev(*Abbv);
-
-    // Add the abbrev to the specified block record.
-    BlockInfo &Info = getOrCreateBlockInfo(BlockID);
-    Info.Abbrevs.push_back(std::move(Abbv));
-
-    return Info.Abbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
-  }
-};
-
-
-} // End llvm namespace
-
-#endif