vendor/llvm/llvm-trunk-r366426

1 files changed, 0 insertions, 390 deletions

diff --git a/lib/Bitcode/Reader/BitstreamReader.cpp b/lib/Bitcode/Reader/BitstreamReader.cpp
deleted file mode 100644
index 771cf3d927bc..000000000000
--- a/lib/Bitcode/Reader/BitstreamReader.cpp
+++ /dev/null
@@ -1,390 +0,0 @@
-//===- BitstreamReader.cpp - BitstreamReader implementation ---------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Bitcode/BitstreamReader.h"
-#include "llvm/ADT/StringRef.h"
-#include <cassert>
-#include <string>
-
-using namespace llvm;
-
-//===----------------------------------------------------------------------===//
-//  BitstreamCursor implementation
-//===----------------------------------------------------------------------===//
-
-/// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, enter
-/// the block, and return true if the block has an error.
-bool BitstreamCursor::EnterSubBlock(unsigned BlockID, unsigned *NumWordsP) {
-  // 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) {
-    if (const BitstreamBlockInfo::BlockInfo *Info =
-            BlockInfo->getBlockInfo(BlockID)) {
-      CurAbbrevs.insert(CurAbbrevs.end(), Info->Abbrevs.begin(),
-                        Info->Abbrevs.end());
-    }
-  }
-
-  // Get the codesize of this block.
-  CurCodeSize = ReadVBR(bitc::CodeLenWidth);
-  // We can't read more than MaxChunkSize at a time
-  if (CurCodeSize > MaxChunkSize)
-    return true;
-
-  SkipToFourByteBoundary();
-  unsigned NumWords = Read(bitc::BlockSizeWidth);
-  if (NumWordsP) *NumWordsP = NumWords;
-
-  // Validate that this block is sane.
-  return CurCodeSize == 0 || AtEndOfStream();
-}
-
-static uint64_t readAbbreviatedField(BitstreamCursor &Cursor,
-                                     const BitCodeAbbrevOp &Op) {
-  assert(!Op.isLiteral() && "Not to be used with literals!");
-
-  // Decode the value as we are commanded.
-  switch (Op.getEncoding()) {
-  case BitCodeAbbrevOp::Array:
-  case BitCodeAbbrevOp::Blob:
-    llvm_unreachable("Should not reach here");
-  case BitCodeAbbrevOp::Fixed:
-    assert((unsigned)Op.getEncodingData() <= Cursor.MaxChunkSize);
-    return Cursor.Read((unsigned)Op.getEncodingData());
-  case BitCodeAbbrevOp::VBR:
-    assert((unsigned)Op.getEncodingData() <= Cursor.MaxChunkSize);
-    return Cursor.ReadVBR64((unsigned)Op.getEncodingData());
-  case BitCodeAbbrevOp::Char6:
-    return BitCodeAbbrevOp::DecodeChar6(Cursor.Read(6));
-  }
-  llvm_unreachable("invalid abbreviation encoding");
-}
-
-static void skipAbbreviatedField(BitstreamCursor &Cursor,
-                                 const BitCodeAbbrevOp &Op) {
-  assert(!Op.isLiteral() && "Not to be used with literals!");
-
-  // Decode the value as we are commanded.
-  switch (Op.getEncoding()) {
-  case BitCodeAbbrevOp::Array:
-  case BitCodeAbbrevOp::Blob:
-    llvm_unreachable("Should not reach here");
-  case BitCodeAbbrevOp::Fixed:
-    assert((unsigned)Op.getEncodingData() <= Cursor.MaxChunkSize);
-    Cursor.Read((unsigned)Op.getEncodingData());
-    break;
-  case BitCodeAbbrevOp::VBR:
-    assert((unsigned)Op.getEncodingData() <= Cursor.MaxChunkSize);
-    Cursor.ReadVBR64((unsigned)Op.getEncodingData());
-    break;
-  case BitCodeAbbrevOp::Char6:
-    Cursor.Read(6);
-    break;
-  }
-}
-
-/// skipRecord - Read the current record and discard it.
-unsigned BitstreamCursor::skipRecord(unsigned AbbrevID) {
-  // Skip unabbreviated records by reading past their entries.
-  if (AbbrevID == bitc::UNABBREV_RECORD) {
-    unsigned Code = ReadVBR(6);
-    unsigned NumElts = ReadVBR(6);
-    for (unsigned i = 0; i != NumElts; ++i)
-      (void)ReadVBR64(6);
-    return Code;
-  }
-
-  const BitCodeAbbrev *Abbv = getAbbrev(AbbrevID);
-  const BitCodeAbbrevOp &CodeOp = Abbv->getOperandInfo(0);
-  unsigned Code;
-  if (CodeOp.isLiteral())
-    Code = CodeOp.getLiteralValue();
-  else {
-    if (CodeOp.getEncoding() == BitCodeAbbrevOp::Array ||
-        CodeOp.getEncoding() == BitCodeAbbrevOp::Blob)
-      report_fatal_error("Abbreviation starts with an Array or a Blob");
-    Code = readAbbreviatedField(*this, CodeOp);
-  }
-
-  for (unsigned i = 1, e = Abbv->getNumOperandInfos(); i < e; ++i) {
-    const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
-    if (Op.isLiteral())
-      continue;
-
-    if (Op.getEncoding() != BitCodeAbbrevOp::Array &&
-        Op.getEncoding() != BitCodeAbbrevOp::Blob) {
-      skipAbbreviatedField(*this, Op);
-      continue;
-    }
-
-    if (Op.getEncoding() == BitCodeAbbrevOp::Array) {
-      // Array case.  Read the number of elements as a vbr6.
-      unsigned NumElts = ReadVBR(6);
-
-      // Get the element encoding.
-      assert(i+2 == e && "array op not second to last?");
-      const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
-
-      // Read all the elements.
-      // Decode the value as we are commanded.
-      switch (EltEnc.getEncoding()) {
-      default:
-        report_fatal_error("Array element type can't be an Array or a Blob");
-      case BitCodeAbbrevOp::Fixed:
-        assert((unsigned)EltEnc.getEncodingData() <= MaxChunkSize);
-        JumpToBit(GetCurrentBitNo() + NumElts * EltEnc.getEncodingData());
-        break;
-      case BitCodeAbbrevOp::VBR:
-        assert((unsigned)EltEnc.getEncodingData() <= MaxChunkSize);
-        for (; NumElts; --NumElts)
-          ReadVBR64((unsigned)EltEnc.getEncodingData());
-        break;
-      case BitCodeAbbrevOp::Char6:
-        JumpToBit(GetCurrentBitNo() + NumElts * 6);
-        break;
-      }
-      continue;
-    }
-
-    assert(Op.getEncoding() == BitCodeAbbrevOp::Blob);
-    // Blob case.  Read the number of bytes as a vbr6.
-    unsigned NumElts = ReadVBR(6);
-    SkipToFourByteBoundary();  // 32-bit alignment
-
-    // Figure out where the end of this blob will be including tail padding.
-    size_t NewEnd = GetCurrentBitNo()+((NumElts+3)&~3)*8;
-
-    // If this would read off the end of the bitcode file, just set the
-    // record to empty and return.
-    if (!canSkipToPos(NewEnd/8)) {
-      skipToEnd();
-      break;
-    }
-
-    // Skip over the blob.
-    JumpToBit(NewEnd);
-  }
-  return Code;
-}
-
-unsigned BitstreamCursor::readRecord(unsigned AbbrevID,
-                                     SmallVectorImpl<uint64_t> &Vals,
-                                     StringRef *Blob) {
-  if (AbbrevID == bitc::UNABBREV_RECORD) {
-    unsigned Code = ReadVBR(6);
-    unsigned NumElts = ReadVBR(6);
-    for (unsigned i = 0; i != NumElts; ++i)
-      Vals.push_back(ReadVBR64(6));
-    return Code;
-  }
-
-  const BitCodeAbbrev *Abbv = getAbbrev(AbbrevID);
-
-  // Read the record code first.
-  assert(Abbv->getNumOperandInfos() != 0 && "no record code in abbreviation?");
-  const BitCodeAbbrevOp &CodeOp = Abbv->getOperandInfo(0);
-  unsigned Code;
-  if (CodeOp.isLiteral())
-    Code = CodeOp.getLiteralValue();
-  else {
-    if (CodeOp.getEncoding() == BitCodeAbbrevOp::Array ||
-        CodeOp.getEncoding() == BitCodeAbbrevOp::Blob)
-      report_fatal_error("Abbreviation starts with an Array or a Blob");
-    Code = readAbbreviatedField(*this, CodeOp);
-  }
-
-  for (unsigned i = 1, e = Abbv->getNumOperandInfos(); i != e; ++i) {
-    const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
-    if (Op.isLiteral()) {
-      Vals.push_back(Op.getLiteralValue());
-      continue;
-    }
-
-    if (Op.getEncoding() != BitCodeAbbrevOp::Array &&
-        Op.getEncoding() != BitCodeAbbrevOp::Blob) {
-      Vals.push_back(readAbbreviatedField(*this, Op));
-      continue;
-    }
-
-    if (Op.getEncoding() == BitCodeAbbrevOp::Array) {
-      // Array case.  Read the number of elements as a vbr6.
-      unsigned NumElts = ReadVBR(6);
-
-      // Get the element encoding.
-      if (i + 2 != e)
-        report_fatal_error("Array op not second to last");
-      const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
-      if (!EltEnc.isEncoding())
-        report_fatal_error(
-            "Array element type has to be an encoding of a type");
-
-      // Read all the elements.
-      switch (EltEnc.getEncoding()) {
-      default:
-        report_fatal_error("Array element type can't be an Array or a Blob");
-      case BitCodeAbbrevOp::Fixed:
-        for (; NumElts; --NumElts)
-          Vals.push_back(Read((unsigned)EltEnc.getEncodingData()));
-        break;
-      case BitCodeAbbrevOp::VBR:
-        for (; NumElts; --NumElts)
-          Vals.push_back(ReadVBR64((unsigned)EltEnc.getEncodingData()));
-        break;
-      case BitCodeAbbrevOp::Char6:
-        for (; NumElts; --NumElts)
-          Vals.push_back(BitCodeAbbrevOp::DecodeChar6(Read(6)));
-      }
-      continue;
-    }
-
-    assert(Op.getEncoding() == BitCodeAbbrevOp::Blob);
-    // Blob case.  Read the number of bytes as a vbr6.
-    unsigned NumElts = ReadVBR(6);
-    SkipToFourByteBoundary();  // 32-bit alignment
-
-    // Figure out where the end of this blob will be including tail padding.
-    size_t CurBitPos = GetCurrentBitNo();
-    size_t NewEnd = CurBitPos+((NumElts+3)&~3)*8;
-
-    // If this would read off the end of the bitcode file, just set the
-    // record to empty and return.
-    if (!canSkipToPos(NewEnd/8)) {
-      Vals.append(NumElts, 0);
-      skipToEnd();
-      break;
-    }
-
-    // Otherwise, inform the streamer that we need these bytes in memory.  Skip
-    // over tail padding first, in case jumping to NewEnd invalidates the Blob
-    // pointer.
-    JumpToBit(NewEnd);
-    const char *Ptr = (const char *)getPointerToBit(CurBitPos, NumElts);
-
-    // If we can return a reference to the data, do so to avoid copying it.
-    if (Blob) {
-      *Blob = StringRef(Ptr, NumElts);
-    } else {
-      // Otherwise, unpack into Vals with zero extension.
-      for (; NumElts; --NumElts)
-        Vals.push_back((unsigned char)*Ptr++);
-    }
-  }
-
-  return Code;
-}
-
-void BitstreamCursor::ReadAbbrevRecord() {
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  unsigned NumOpInfo = ReadVBR(5);
-  for (unsigned i = 0; i != NumOpInfo; ++i) {
-    bool IsLiteral = Read(1);
-    if (IsLiteral) {
-      Abbv->Add(BitCodeAbbrevOp(ReadVBR64(8)));
-      continue;
-    }
-
-    BitCodeAbbrevOp::Encoding E = (BitCodeAbbrevOp::Encoding)Read(3);
-    if (BitCodeAbbrevOp::hasEncodingData(E)) {
-      uint64_t Data = ReadVBR64(5);
-
-      // As a special case, handle fixed(0) (i.e., a fixed field with zero bits)
-      // and vbr(0) as a literal zero.  This is decoded the same way, and avoids
-      // a slow path in Read() to have to handle reading zero bits.
-      if ((E == BitCodeAbbrevOp::Fixed || E == BitCodeAbbrevOp::VBR) &&
-          Data == 0) {
-        Abbv->Add(BitCodeAbbrevOp(0));
-        continue;
-      }
-
-      if ((E == BitCodeAbbrevOp::Fixed || E == BitCodeAbbrevOp::VBR) &&
-          Data > MaxChunkSize)
-        report_fatal_error(
-            "Fixed or VBR abbrev record with size > MaxChunkData");
-
-      Abbv->Add(BitCodeAbbrevOp(E, Data));
-    } else
-      Abbv->Add(BitCodeAbbrevOp(E));
-  }
-
-  if (Abbv->getNumOperandInfos() == 0)
-    report_fatal_error("Abbrev record with no operands");
-  CurAbbrevs.push_back(std::move(Abbv));
-}
-
-Optional<BitstreamBlockInfo>
-BitstreamCursor::ReadBlockInfoBlock(bool ReadBlockInfoNames) {
-  if (EnterSubBlock(bitc::BLOCKINFO_BLOCK_ID)) return None;
-
-  BitstreamBlockInfo NewBlockInfo;
-
-  SmallVector<uint64_t, 64> Record;
-  BitstreamBlockInfo::BlockInfo *CurBlockInfo = nullptr;
-
-  // Read all the records for this module.
-  while (true) {
-    BitstreamEntry Entry = advanceSkippingSubblocks(AF_DontAutoprocessAbbrevs);
-
-    switch (Entry.Kind) {
-    case llvm::BitstreamEntry::SubBlock: // Handled for us already.
-    case llvm::BitstreamEntry::Error:
-      return None;
-    case llvm::BitstreamEntry::EndBlock:
-      return std::move(NewBlockInfo);
-    case llvm::BitstreamEntry::Record:
-      // The interesting case.
-      break;
-    }
-
-    // Read abbrev records, associate them with CurBID.
-    if (Entry.ID == bitc::DEFINE_ABBREV) {
-      if (!CurBlockInfo) return None;
-      ReadAbbrevRecord();
-
-      // ReadAbbrevRecord installs the abbrev in CurAbbrevs.  Move it to the
-      // appropriate BlockInfo.
-      CurBlockInfo->Abbrevs.push_back(std::move(CurAbbrevs.back()));
-      CurAbbrevs.pop_back();
-      continue;
-    }
-
-    // Read a record.
-    Record.clear();
-    switch (readRecord(Entry.ID, Record)) {
-      default: break;  // Default behavior, ignore unknown content.
-      case bitc::BLOCKINFO_CODE_SETBID:
-        if (Record.size() < 1) return None;
-        CurBlockInfo = &NewBlockInfo.getOrCreateBlockInfo((unsigned)Record[0]);
-        break;
-      case bitc::BLOCKINFO_CODE_BLOCKNAME: {
-        if (!CurBlockInfo) return None;
-        if (!ReadBlockInfoNames)
-          break; // Ignore name.
-        std::string Name;
-        for (unsigned i = 0, e = Record.size(); i != e; ++i)
-          Name += (char)Record[i];
-        CurBlockInfo->Name = Name;
-        break;
-      }
-      case bitc::BLOCKINFO_CODE_SETRECORDNAME: {
-        if (!CurBlockInfo) return None;
-        if (!ReadBlockInfoNames)
-          break; // Ignore name.
-        std::string Name;
-        for (unsigned i = 1, e = Record.size(); i != e; ++i)
-          Name += (char)Record[i];
-        CurBlockInfo->RecordNames.push_back(std::make_pair((unsigned)Record[0],
-                                                           Name));
-        break;
-      }
-    }
-  }
-}