/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp

Bug Summary

File:	lib/Bitcode/Reader/BitcodeReader.cpp
Warning:	line 4448, column 9 Called C++ object pointer is null
Annotated Source Code

Press '?' to see keyboard shortcuts
Show analyzer invocation
clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name BitcodeReader.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-8/lib/clang/8.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/lib/Bitcode/Reader -I /build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader -I /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/include -I /build/llvm-toolchain-snapshot-8~svn345461/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/include/clang/8.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-8/lib/clang/8.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-8~svn345461/build-llvm/lib/Bitcode/Reader -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-10-27-211344-32123-1 -x c++ /build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp -faddrsig
1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//

10#include "llvm/Bitcode/BitcodeReader.h"
11#include "MetadataLoader.h"
12#include "ValueList.h"
13#include "llvm/ADT/APFloat.h"
14#include "llvm/ADT/APInt.h"
15#include "llvm/ADT/ArrayRef.h"
16#include "llvm/ADT/DenseMap.h"
17#include "llvm/ADT/Optional.h"
18#include "llvm/ADT/STLExtras.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/ADT/SmallVector.h"
21#include "llvm/ADT/StringRef.h"
22#include "llvm/ADT/Triple.h"
23#include "llvm/ADT/Twine.h"
24#include "llvm/Bitcode/BitstreamReader.h"
25#include "llvm/Bitcode/LLVMBitCodes.h"
26#include "llvm/Config/llvm-config.h"
27#include "llvm/IR/Argument.h"
28#include "llvm/IR/Attributes.h"
29#include "llvm/IR/AutoUpgrade.h"
30#include "llvm/IR/BasicBlock.h"
31#include "llvm/IR/CallSite.h"
32#include "llvm/IR/CallingConv.h"
33#include "llvm/IR/Comdat.h"
34#include "llvm/IR/Constant.h"
35#include "llvm/IR/Constants.h"
36#include "llvm/IR/DataLayout.h"
37#include "llvm/IR/DebugInfo.h"
38#include "llvm/IR/DebugInfoMetadata.h"
39#include "llvm/IR/DebugLoc.h"
40#include "llvm/IR/DerivedTypes.h"
41#include "llvm/IR/Function.h"
42#include "llvm/IR/GVMaterializer.h"
43#include "llvm/IR/GlobalAlias.h"
44#include "llvm/IR/GlobalIFunc.h"
45#include "llvm/IR/GlobalIndirectSymbol.h"
46#include "llvm/IR/GlobalObject.h"
47#include "llvm/IR/GlobalValue.h"
48#include "llvm/IR/GlobalVariable.h"
49#include "llvm/IR/InlineAsm.h"
50#include "llvm/IR/InstIterator.h"
51#include "llvm/IR/InstrTypes.h"
52#include "llvm/IR/Instruction.h"
53#include "llvm/IR/Instructions.h"
54#include "llvm/IR/Intrinsics.h"
55#include "llvm/IR/LLVMContext.h"
56#include "llvm/IR/Metadata.h"
57#include "llvm/IR/Module.h"
58#include "llvm/IR/ModuleSummaryIndex.h"
59#include "llvm/IR/Operator.h"
60#include "llvm/IR/Type.h"
61#include "llvm/IR/Value.h"
62#include "llvm/IR/Verifier.h"
63#include "llvm/Support/AtomicOrdering.h"
64#include "llvm/Support/Casting.h"
65#include "llvm/Support/CommandLine.h"
66#include "llvm/Support/Compiler.h"
67#include "llvm/Support/Debug.h"
68#include "llvm/Support/Error.h"
69#include "llvm/Support/ErrorHandling.h"
70#include "llvm/Support/ErrorOr.h"
71#include "llvm/Support/ManagedStatic.h"
72#include "llvm/Support/MathExtras.h"
73#include "llvm/Support/MemoryBuffer.h"
74#include "llvm/Support/raw_ostream.h"
75#include <algorithm>
76#include <cassert>
77#include <cstddef>
78#include <cstdint>
79#include <deque>
80#include <map>
81#include <memory>
82#include <set>
83#include <string>
84#include <system_error>
85#include <tuple>
86#include <utility>
87#include <vector>

89using namespace llvm;

91static cl::opt<bool> PrintSummaryGUIDs(
  "print-summary-global-ids", cl::init(false), cl::Hidden,
  cl::desc(
      "Print the global id for each value when reading the module summary"));

96namespace {

98enum {
SWITCH_INST_MAGIC = 0x4B5 // May 2012 => 1205 => Hex
100};

102} // end anonymous namespace

104static Error error(const Twine &Message) {
return make_error<StringError>(
    Message, make_error_code(BitcodeError::CorruptedBitcode));
107}

109/// Helper to read the header common to all bitcode files.
110static bool hasValidBitcodeHeader(BitstreamCursor &Stream) {
// Sniff for the signature.
if (!Stream.canSkipToPos(4) ||
    Stream.Read(8) != 'B' ||
    Stream.Read(8) != 'C' ||
    Stream.Read(4) != 0x0 ||
    Stream.Read(4) != 0xC ||
    Stream.Read(4) != 0xE ||
    Stream.Read(4) != 0xD)
  return false;
return true;
121}

123static Expected<BitstreamCursor> initStream(MemoryBufferRef Buffer) {
const unsigned char *BufPtr = (const unsigned char *)Buffer.getBufferStart();
const unsigned char *BufEnd = BufPtr + Buffer.getBufferSize();

if (Buffer.getBufferSize() & 3)
  return error("Invalid bitcode signature");

// If we have a wrapper header, parse it and ignore the non-bc file contents.
// The magic number is 0x0B17C0DE stored in little endian.
if (isBitcodeWrapper(BufPtr, BufEnd))
  if (SkipBitcodeWrapperHeader(BufPtr, BufEnd, true))
    return error("Invalid bitcode wrapper header");

BitstreamCursor Stream(ArrayRef<uint8_t>(BufPtr, BufEnd));
if (!hasValidBitcodeHeader(Stream))
  return error("Invalid bitcode signature");

return std::move(Stream);
141}

143/// Convert a string from a record into an std::string, return true on failure.
144template <typename StrTy>
145static bool convertToString(ArrayRef<uint64_t> Record, unsigned Idx,
                          StrTy &Result) {
if (Idx > Record.size())
  return true;

for (unsigned i = Idx, e = Record.size(); i != e; ++i)
  Result += (char)Record[i];
return false;
153}

155// Strip all the TBAA attachment for the module.
156static void stripTBAA(Module *M) {
for (auto &F : *M) {
  if (F.isMaterializable())
    continue;
  for (auto &I : instructions(F))
    I.setMetadata(LLVMContext::MD_tbaa, nullptr);
}
163}

165/// Read the "IDENTIFICATION_BLOCK_ID" block, do some basic enforcement on the
166/// "epoch" encoded in the bitcode, and return the producer name if any.
167static Expected<std::string> readIdentificationBlock(BitstreamCursor &Stream) {
if (Stream.EnterSubBlock(bitc::IDENTIFICATION_BLOCK_ID))
  return error("Invalid record");

// Read all the records.
SmallVector<uint64_t, 64> Record;

std::string ProducerIdentification;

while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  default:
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return ProducerIdentification;
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  unsigned BitCode = Stream.readRecord(Entry.ID, Record);
  switch (BitCode) {
  default: // Default behavior: reject
    return error("Invalid value");
  case bitc::IDENTIFICATION_CODE_STRING: // IDENTIFICATION: [strchr x N]
    convertToString(Record, 0, ProducerIdentification);
    break;
  case bitc::IDENTIFICATION_CODE_EPOCH: { // EPOCH: [epoch#]
    unsigned epoch = (unsigned)Record[0];
    if (epoch != bitc::BITCODE_CURRENT_EPOCH) {
      return error(
        Twine("Incompatible epoch: Bitcode '") + Twine(epoch) +
        "' vs current: '" + Twine(bitc::BITCODE_CURRENT_EPOCH) + "'");
    }
  }
  }
}
209}

211static Expected<std::string> readIdentificationCode(BitstreamCursor &Stream) {
// We expect a number of well-defined blocks, though we don't necessarily
// need to understand them all.
while (true) {
  if (Stream.AtEndOfStream())
    return "";

  BitstreamEntry Entry = Stream.advance();
  switch (Entry.Kind) {
  case BitstreamEntry::EndBlock:
  case BitstreamEntry::Error:
    return error("Malformed block");

  case BitstreamEntry::SubBlock:
    if (Entry.ID == bitc::IDENTIFICATION_BLOCK_ID)
      return readIdentificationBlock(Stream);

    // Ignore other sub-blocks.
    if (Stream.SkipBlock())
      return error("Malformed block");
    continue;
  case BitstreamEntry::Record:
    Stream.skipRecord(Entry.ID);
    continue;
  }
}
237}

239static Expected<bool> hasObjCCategoryInModule(BitstreamCursor &Stream) {
if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;
// Read all the records for this module.

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return false;
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:
    break; // Default behavior, ignore unknown content.
  case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    // Check for the i386 and other (x86_64, ARM) conventions
    if (S.find("__DATA,__objc_catlist") != std::string::npos ||
        S.find("__OBJC,__category") != std::string::npos)
      return true;
    break;
  }
  }
  Record.clear();
}
llvm_unreachable("Exit infinite loop")::llvm::llvm_unreachable_internal("Exit infinite loop", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 277);
278}

280static Expected<bool> hasObjCCategory(BitstreamCursor &Stream) {
// We expect a number of well-defined blocks, though we don't necessarily
// need to understand them all.
while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return false;

  case BitstreamEntry::SubBlock:
    if (Entry.ID == bitc::MODULE_BLOCK_ID)
      return hasObjCCategoryInModule(Stream);

    // Ignore other sub-blocks.
    if (Stream.SkipBlock())
      return error("Malformed block");
    continue;

  case BitstreamEntry::Record:
    Stream.skipRecord(Entry.ID);
    continue;
  }
}
306}

308static Expected<std::string> readModuleTriple(BitstreamCursor &Stream) {
if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

std::string Triple;

// Read all the records for this module.
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Triple;
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  switch (Stream.readRecord(Entry.ID, Record)) {
  default: break;  // Default behavior, ignore unknown content.
  case bitc::MODULE_CODE_TRIPLE: {  // TRIPLE: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    Triple = S;
    break;
  }
  }
  Record.clear();
}
llvm_unreachable("Exit infinite loop")::llvm::llvm_unreachable_internal("Exit infinite loop", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 344);
345}

347static Expected<std::string> readTriple(BitstreamCursor &Stream) {
// We expect a number of well-defined blocks, though we don't necessarily
// need to understand them all.
while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return "";

  case BitstreamEntry::SubBlock:
    if (Entry.ID == bitc::MODULE_BLOCK_ID)
      return readModuleTriple(Stream);

    // Ignore other sub-blocks.
    if (Stream.SkipBlock())
      return error("Malformed block");
    continue;

  case BitstreamEntry::Record:
    Stream.skipRecord(Entry.ID);
    continue;
  }
}
373}

375namespace {

377class BitcodeReaderBase {
378protected:
BitcodeReaderBase(BitstreamCursor Stream, StringRef Strtab)
    : Stream(std::move(Stream)), Strtab(Strtab) {
  this->Stream.setBlockInfo(&BlockInfo);
}

BitstreamBlockInfo BlockInfo;
BitstreamCursor Stream;
StringRef Strtab;

/// In version 2 of the bitcode we store names of global values and comdats in
/// a string table rather than in the VST.
bool UseStrtab = false;

Expected<unsigned> parseVersionRecord(ArrayRef<uint64_t> Record);

/// If this module uses a string table, pop the reference to the string table
/// and return the referenced string and the rest of the record. Otherwise
/// just return the record itself.
std::pair<StringRef, ArrayRef<uint64_t>>
readNameFromStrtab(ArrayRef<uint64_t> Record);

bool readBlockInfo();

// Contains an arbitrary and optional string identifying the bitcode producer
std::string ProducerIdentification;

Error error(const Twine &Message);
406};

408} // end anonymous namespace

410Error BitcodeReaderBase::error(const Twine &Message) {
std::string FullMsg = Message.str();
if (!ProducerIdentification.empty())
  FullMsg += " (Producer: '" + ProducerIdentification + "' Reader: 'LLVM " +
             LLVM_VERSION_STRING"8.0.0" "')";
return ::error(FullMsg);
416}

418Expected<unsigned>
419BitcodeReaderBase::parseVersionRecord(ArrayRef<uint64_t> Record) {
if (Record.empty())
  return error("Invalid record");
unsigned ModuleVersion = Record[0];
if (ModuleVersion > 2)
  return error("Invalid value");
UseStrtab = ModuleVersion >= 2;
return ModuleVersion;
427}

429std::pair<StringRef, ArrayRef<uint64_t>>
430BitcodeReaderBase::readNameFromStrtab(ArrayRef<uint64_t> Record) {
if (!UseStrtab)
  return {"", Record};
// Invalid reference. Let the caller complain about the record being empty.
if (Record[0] + Record[1] > Strtab.size())
  return {"", {}};
return {StringRef(Strtab.data() + Record[0], Record[1]), Record.slice(2)};
437}

439namespace {

441class BitcodeReader : public BitcodeReaderBase, public GVMaterializer {
LLVMContext &Context;
Module *TheModule = nullptr;
// Next offset to start scanning for lazy parsing of function bodies.
uint64_t NextUnreadBit = 0;
// Last function offset found in the VST.
uint64_t LastFunctionBlockBit = 0;
bool SeenValueSymbolTable = false;
uint64_t VSTOffset = 0;

std::vector<std::string> SectionTable;
std::vector<std::string> GCTable;

std::vector<Type*> TypeList;
BitcodeReaderValueList ValueList;
Optional<MetadataLoader> MDLoader;
std::vector<Comdat *> ComdatList;
SmallVector<Instruction *, 64> InstructionList;

std::vector<std::pair<GlobalVariable *, unsigned>> GlobalInits;
std::vector<std::pair<GlobalIndirectSymbol *, unsigned>> IndirectSymbolInits;
std::vector<std::pair<Function *, unsigned>> FunctionPrefixes;
std::vector<std::pair<Function *, unsigned>> FunctionPrologues;
std::vector<std::pair<Function *, unsigned>> FunctionPersonalityFns;

/// The set of attributes by index.  Index zero in the file is for null, and
/// is thus not represented here.  As such all indices are off by one.
std::vector<AttributeList> MAttributes;

/// The set of attribute groups.
std::map<unsigned, AttributeList> MAttributeGroups;

/// While parsing a function body, this is a list of the basic blocks for the
/// function.
std::vector<BasicBlock*> FunctionBBs;

// When reading the module header, this list is populated with functions that
// have bodies later in the file.
std::vector<Function*> FunctionsWithBodies;

// When intrinsic functions are encountered which require upgrading they are
// stored here with their replacement function.
using UpdatedIntrinsicMap = DenseMap<Function *, Function *>;
UpdatedIntrinsicMap UpgradedIntrinsics;
// Intrinsics which were remangled because of types rename
UpdatedIntrinsicMap RemangledIntrinsics;

// Several operations happen after the module header has been read, but
// before function bodies are processed. This keeps track of whether
// we've done this yet.
bool SeenFirstFunctionBody = false;

/// When function bodies are initially scanned, this map contains info about
/// where to find deferred function body in the stream.
DenseMap<Function*, uint64_t> DeferredFunctionInfo;

/// When Metadata block is initially scanned when parsing the module, we may
/// choose to defer parsing of the metadata. This vector contains info about
/// which Metadata blocks are deferred.
std::vector<uint64_t> DeferredMetadataInfo;

/// These are basic blocks forward-referenced by block addresses.  They are
/// inserted lazily into functions when they're loaded.  The basic block ID is
/// its index into the vector.
DenseMap<Function *, std::vector<BasicBlock *>> BasicBlockFwdRefs;
std::deque<Function *> BasicBlockFwdRefQueue;

/// Indicates that we are using a new encoding for instruction operands where
/// most operands in the current FUNCTION_BLOCK are encoded relative to the
/// instruction number, for a more compact encoding.  Some instruction
/// operands are not relative to the instruction ID: basic block numbers, and
/// types. Once the old style function blocks have been phased out, we would
/// not need this flag.
bool UseRelativeIDs = false;

/// True if all functions will be materialized, negating the need to process
/// (e.g.) blockaddress forward references.
bool WillMaterializeAllForwardRefs = false;

bool StripDebugInfo = false;
TBAAVerifier TBAAVerifyHelper;

std::vector<std::string> BundleTags;
SmallVector<SyncScope::ID, 8> SSIDs;

526public:
BitcodeReader(BitstreamCursor Stream, StringRef Strtab,
              StringRef ProducerIdentification, LLVMContext &Context);

Error materializeForwardReferencedFunctions();

Error materialize(GlobalValue *GV) override;
Error materializeModule() override;
std::vector<StructType *> getIdentifiedStructTypes() const override;

/// Main interface to parsing a bitcode buffer.
/// \returns true if an error occurred.
Error parseBitcodeInto(Module *M, bool ShouldLazyLoadMetadata = false,
                       bool IsImporting = false);

static uint64_t decodeSignRotatedValue(uint64_t V);

/// Materialize any deferred Metadata block.
Error materializeMetadata() override;

void setStripDebugInfo() override;

548private:
std::vector<StructType *> IdentifiedStructTypes;
StructType *createIdentifiedStructType(LLVMContext &Context, StringRef Name);
StructType *createIdentifiedStructType(LLVMContext &Context);

Type *getTypeByID(unsigned ID);

Value *getFnValueByID(unsigned ID, Type *Ty) {
  if (Ty && Ty->isMetadataTy())
    return MetadataAsValue::get(Ty->getContext(), getFnMetadataByID(ID));
  return ValueList.getValueFwdRef(ID, Ty);
}

Metadata *getFnMetadataByID(unsigned ID) {
  return MDLoader->getMetadataFwdRefOrLoad(ID);
}

BasicBlock *getBasicBlock(unsigned ID) const {
  if (ID >= FunctionBBs.size()) return nullptr; // Invalid ID
  return FunctionBBs[ID];
}

AttributeList getAttributes(unsigned i) const {
  if (i-1 < MAttributes.size())
    return MAttributes[i-1];
  return AttributeList();
}

/// Read a value/type pair out of the specified record from slot 'Slot'.
/// Increment Slot past the number of slots used in the record. Return true on
/// failure.
bool getValueTypePair(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
                      unsigned InstNum, Value *&ResVal) {
  if (Slot == Record.size()) return true;
  unsigned ValNo = (unsigned)Record[Slot++];
  // Adjust the ValNo, if it was encoded relative to the InstNum.
  if (UseRelativeIDs)
    ValNo = InstNum - ValNo;
  if (ValNo < InstNum) {
    // If this is not a forward reference, just return the value we already
    // have.
    ResVal = getFnValueByID(ValNo, nullptr);
    return ResVal == nullptr;
  }
  if (Slot == Record.size())
    return true;

  unsigned TypeNo = (unsigned)Record[Slot++];
  ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
  return ResVal == nullptr;
}

/// Read a value out of the specified record from slot 'Slot'. Increment Slot
/// past the number of slots used by the value in the record. Return true if
/// there is an error.
bool popValue(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
              unsigned InstNum, Type *Ty, Value *&ResVal) {
  if (getValue(Record, Slot, InstNum, Ty, ResVal))
    return true;
  // All values currently take a single record slot.
  ++Slot;
  return false;
}

/// Like popValue, but does not increment the Slot number.
bool getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
              unsigned InstNum, Type *Ty, Value *&ResVal) {
  ResVal = getValue(Record, Slot, InstNum, Ty);
  return ResVal == nullptr;
}

/// Version of getValue that returns ResVal directly, or 0 if there is an
/// error.
Value *getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
                unsigned InstNum, Type *Ty) {
  if (Slot == Record.size()) return nullptr;
  unsigned ValNo = (unsigned)Record[Slot];
  // Adjust the ValNo, if it was encoded relative to the InstNum.
  if (UseRelativeIDs)
    ValNo = InstNum - ValNo;
  return getFnValueByID(ValNo, Ty);
}

/// Like getValue, but decodes signed VBRs.
Value *getValueSigned(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
                      unsigned InstNum, Type *Ty) {
  if (Slot == Record.size()) return nullptr;
  unsigned ValNo = (unsigned)decodeSignRotatedValue(Record[Slot]);
  // Adjust the ValNo, if it was encoded relative to the InstNum.
  if (UseRelativeIDs)
    ValNo = InstNum - ValNo;
  return getFnValueByID(ValNo, Ty);
}

/// Converts alignment exponent (i.e. power of two (or zero)) to the
/// corresponding alignment to use. If alignment is too large, returns
/// a corresponding error code.
Error parseAlignmentValue(uint64_t Exponent, unsigned &Alignment);
Error parseAttrKind(uint64_t Code, Attribute::AttrKind *Kind);
Error parseModule(uint64_t ResumeBit, bool ShouldLazyLoadMetadata = false);

Error parseComdatRecord(ArrayRef<uint64_t> Record);
Error parseGlobalVarRecord(ArrayRef<uint64_t> Record);
Error parseFunctionRecord(ArrayRef<uint64_t> Record);
Error parseGlobalIndirectSymbolRecord(unsigned BitCode,
                                      ArrayRef<uint64_t> Record);

Error parseAttributeBlock();
Error parseAttributeGroupBlock();
Error parseTypeTable();
Error parseTypeTableBody();
Error parseOperandBundleTags();
Error parseSyncScopeNames();

Expected<Value *> recordValue(SmallVectorImpl<uint64_t> &Record,
                              unsigned NameIndex, Triple &TT);
void setDeferredFunctionInfo(unsigned FuncBitcodeOffsetDelta, Function *F,
                             ArrayRef<uint64_t> Record);
Error parseValueSymbolTable(uint64_t Offset = 0);
Error parseGlobalValueSymbolTable();
Error parseConstants();
Error rememberAndSkipFunctionBodies();
Error rememberAndSkipFunctionBody();
/// Save the positions of the Metadata blocks and skip parsing the blocks.
Error rememberAndSkipMetadata();
Error typeCheckLoadStoreInst(Type *ValType, Type *PtrType);
Error parseFunctionBody(Function *F);
Error globalCleanup();
Error resolveGlobalAndIndirectSymbolInits();
Error parseUseLists();
Error findFunctionInStream(
    Function *F,
    DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator);

SyncScope::ID getDecodedSyncScopeID(unsigned Val);
683};

685/// Class to manage reading and parsing function summary index bitcode
686/// files/sections.
687class ModuleSummaryIndexBitcodeReader : public BitcodeReaderBase {
/// The module index built during parsing.
ModuleSummaryIndex &TheIndex;

/// Indicates whether we have encountered a global value summary section
/// yet during parsing.
bool SeenGlobalValSummary = false;

/// Indicates whether we have already parsed the VST, used for error checking.
bool SeenValueSymbolTable = false;

/// Set to the offset of the VST recorded in the MODULE_CODE_VSTOFFSET record.
/// Used to enable on-demand parsing of the VST.
uint64_t VSTOffset = 0;

// Map to save ValueId to ValueInfo association that was recorded in the
// ValueSymbolTable. It is used after the VST is parsed to convert
// call graph edges read from the function summary from referencing
// callees by their ValueId to using the ValueInfo instead, which is how
// they are recorded in the summary index being built.
// We save a GUID which refers to the same global as the ValueInfo, but
// ignoring the linkage, i.e. for values other than local linkage they are
// identical.
DenseMap<unsigned, std::pair<ValueInfo, GlobalValue::GUID>>
    ValueIdToValueInfoMap;

/// Map populated during module path string table parsing, from the
/// module ID to a string reference owned by the index's module
/// path string table, used to correlate with combined index
/// summary records.
DenseMap<uint64_t, StringRef> ModuleIdMap;

/// Original source file name recorded in a bitcode record.
std::string SourceFileName;

/// The string identifier given to this module by the client, normally the
/// path to the bitcode file.
StringRef ModulePath;

/// For per-module summary indexes, the unique numerical identifier given to
/// this module by the client.
unsigned ModuleId;

730public:
ModuleSummaryIndexBitcodeReader(BitstreamCursor Stream, StringRef Strtab,
                                ModuleSummaryIndex &TheIndex,
                                StringRef ModulePath, unsigned ModuleId);

Error parseModule();

737private:
void setValueGUID(uint64_t ValueID, StringRef ValueName,
                  GlobalValue::LinkageTypes Linkage,
                  StringRef SourceFileName);
Error parseValueSymbolTable(
    uint64_t Offset,
    DenseMap<unsigned, GlobalValue::LinkageTypes> &ValueIdToLinkageMap);
std::vector<ValueInfo> makeRefList(ArrayRef<uint64_t> Record);
std::vector<FunctionSummary::EdgeTy> makeCallList(ArrayRef<uint64_t> Record,
                                                  bool IsOldProfileFormat,
                                                  bool HasProfile,
                                                  bool HasRelBF);
Error parseEntireSummary(unsigned ID);
Error parseModuleStringTable();

std::pair<ValueInfo, GlobalValue::GUID>
getValueInfoFromValueId(unsigned ValueId);

void addThisModule();
ModuleSummaryIndex::ModuleInfo *getThisModule();
757};

759} // end anonymous namespace

761std::error_code llvm::errorToErrorCodeAndEmitErrors(LLVMContext &Ctx,
                                                  Error Err) {
if (Err) {
  std::error_code EC;
  handleAllErrors(std::move(Err), [&](ErrorInfoBase &EIB) {
    EC = EIB.convertToErrorCode();
    Ctx.emitError(EIB.message());
  });
  return EC;
}
return std::error_code();
772}

774BitcodeReader::BitcodeReader(BitstreamCursor Stream, StringRef Strtab,
                           StringRef ProducerIdentification,
                           LLVMContext &Context)
  : BitcodeReaderBase(std::move(Stream), Strtab), Context(Context),
    ValueList(Context) {
this->ProducerIdentification = ProducerIdentification;
780}

782Error BitcodeReader::materializeForwardReferencedFunctions() {
if (WillMaterializeAllForwardRefs)
  return Error::success();

// Prevent recursion.
WillMaterializeAllForwardRefs = true;

while (!BasicBlockFwdRefQueue.empty()) {
  Function *F = BasicBlockFwdRefQueue.front();
  BasicBlockFwdRefQueue.pop_front();
  assert(F && "Expected valid function")((F && "Expected valid function") ? static_cast<void
> (0) : __assert_fail ("F && \"Expected valid function\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 792, __PRETTY_FUNCTION__));
  if (!BasicBlockFwdRefs.count(F))
    // Already materialized.
    continue;

  // Check for a function that isn't materializable to prevent an infinite
  // loop.  When parsing a blockaddress stored in a global variable, there
  // isn't a trivial way to check if a function will have a body without a
  // linear search through FunctionsWithBodies, so just check it here.
  if (!F->isMaterializable())
    return error("Never resolved function from blockaddress");

  // Try to materialize F.
  if (Error Err = materialize(F))
    return Err;
}
assert(BasicBlockFwdRefs.empty() && "Function missing from queue")((BasicBlockFwdRefs.empty() && "Function missing from queue"
) ? static_cast<void> (0) : __assert_fail ("BasicBlockFwdRefs.empty() && \"Function missing from queue\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 808, __PRETTY_FUNCTION__));

// Reset state.
WillMaterializeAllForwardRefs = false;
return Error::success();
813}

815//===----------------------------------------------------------------------===//
816//  Helper functions to implement forward reference resolution, etc.
817//===----------------------------------------------------------------------===//

819static bool hasImplicitComdat(size_t Val) {
switch (Val) {
default:
  return false;
case 1:  // Old WeakAnyLinkage
case 4:  // Old LinkOnceAnyLinkage
case 10: // Old WeakODRLinkage
case 11: // Old LinkOnceODRLinkage
  return true;
}
829}

831static GlobalValue::LinkageTypes getDecodedLinkage(unsigned Val) {
switch (Val) {
default: // Map unknown/new linkages to external
case 0:
  return GlobalValue::ExternalLinkage;
case 2:
  return GlobalValue::AppendingLinkage;
case 3:
  return GlobalValue::InternalLinkage;
case 5:
  return GlobalValue::ExternalLinkage; // Obsolete DLLImportLinkage
case 6:
  return GlobalValue::ExternalLinkage; // Obsolete DLLExportLinkage
case 7:
  return GlobalValue::ExternalWeakLinkage;
case 8:
  return GlobalValue::CommonLinkage;
case 9:
  return GlobalValue::PrivateLinkage;
case 12:
  return GlobalValue::AvailableExternallyLinkage;
case 13:
  return GlobalValue::PrivateLinkage; // Obsolete LinkerPrivateLinkage
case 14:
  return GlobalValue::PrivateLinkage; // Obsolete LinkerPrivateWeakLinkage
case 15:
  return GlobalValue::ExternalLinkage; // Obsolete LinkOnceODRAutoHideLinkage
case 1: // Old value with implicit comdat.
case 16:
  return GlobalValue::WeakAnyLinkage;
case 10: // Old value with implicit comdat.
case 17:
  return GlobalValue::WeakODRLinkage;
case 4: // Old value with implicit comdat.
case 18:
  return GlobalValue::LinkOnceAnyLinkage;
case 11: // Old value with implicit comdat.
case 19:
  return GlobalValue::LinkOnceODRLinkage;
}
871}

873static FunctionSummary::FFlags getDecodedFFlags(uint64_t RawFlags) {
FunctionSummary::FFlags Flags;
Flags.ReadNone = RawFlags & 0x1;
Flags.ReadOnly = (RawFlags >> 1) & 0x1;
Flags.NoRecurse = (RawFlags >> 2) & 0x1;
Flags.ReturnDoesNotAlias = (RawFlags >> 3) & 0x1;
return Flags;
880}

882/// Decode the flags for GlobalValue in the summary.
883static GlobalValueSummary::GVFlags getDecodedGVSummaryFlags(uint64_t RawFlags,
                                                          uint64_t Version) {
// Summary were not emitted before LLVM 3.9, we don't need to upgrade Linkage
// like getDecodedLinkage() above. Any future change to the linkage enum and
// to getDecodedLinkage() will need to be taken into account here as above.
auto Linkage = GlobalValue::LinkageTypes(RawFlags & 0xF); // 4 bits
RawFlags = RawFlags >> 4;
bool NotEligibleToImport = (RawFlags & 0x1) || Version < 3;
// The Live flag wasn't introduced until version 3. For dead stripping
// to work correctly on earlier versions, we must conservatively treat all
// values as live.
bool Live = (RawFlags & 0x2) || Version < 3;
bool Local = (RawFlags & 0x4);

return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, Live, Local);
898}

900static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {
switch (Val) {
default: // Map unknown visibilities to default.
case 0: return GlobalValue::DefaultVisibility;
case 1: return GlobalValue::HiddenVisibility;
case 2: return GlobalValue::ProtectedVisibility;
}
907}

909static GlobalValue::DLLStorageClassTypes
910getDecodedDLLStorageClass(unsigned Val) {
switch (Val) {
default: // Map unknown values to default.
case 0: return GlobalValue::DefaultStorageClass;
case 1: return GlobalValue::DLLImportStorageClass;
case 2: return GlobalValue::DLLExportStorageClass;
}
917}

919static bool getDecodedDSOLocal(unsigned Val) {
switch(Val) {
default: // Map unknown values to preemptable.
case 0:  return false;
case 1:  return true;
}
925}

927static GlobalVariable::ThreadLocalMode getDecodedThreadLocalMode(unsigned Val) {
switch (Val) {
  case 0: return GlobalVariable::NotThreadLocal;
  default: // Map unknown non-zero value to general dynamic.
  case 1: return GlobalVariable::GeneralDynamicTLSModel;
  case 2: return GlobalVariable::LocalDynamicTLSModel;
  case 3: return GlobalVariable::InitialExecTLSModel;
  case 4: return GlobalVariable::LocalExecTLSModel;
}
936}

938static GlobalVariable::UnnamedAddr getDecodedUnnamedAddrType(unsigned Val) {
switch (Val) {
  default: // Map unknown to UnnamedAddr::None.
  case 0: return GlobalVariable::UnnamedAddr::None;
  case 1: return GlobalVariable::UnnamedAddr::Global;
  case 2: return GlobalVariable::UnnamedAddr::Local;
}
945}

947static int getDecodedCastOpcode(unsigned Val) {
switch (Val) {
default: return -1;
case bitc::CAST_TRUNC   : return Instruction::Trunc;
case bitc::CAST_ZEXT    : return Instruction::ZExt;
case bitc::CAST_SEXT    : return Instruction::SExt;
case bitc::CAST_FPTOUI  : return Instruction::FPToUI;
case bitc::CAST_FPTOSI  : return Instruction::FPToSI;
case bitc::CAST_UITOFP  : return Instruction::UIToFP;
case bitc::CAST_SITOFP  : return Instruction::SIToFP;
case bitc::CAST_FPTRUNC : return Instruction::FPTrunc;
case bitc::CAST_FPEXT   : return Instruction::FPExt;
case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
case bitc::CAST_BITCAST : return Instruction::BitCast;
case bitc::CAST_ADDRSPACECAST: return Instruction::AddrSpaceCast;
}
964}

966static int getDecodedBinaryOpcode(unsigned Val, Type *Ty) {
bool IsFP = Ty->isFPOrFPVectorTy();
// BinOps are only valid for int/fp or vector of int/fp types
if (!IsFP && !Ty->isIntOrIntVectorTy())
  return -1;

switch (Val) {
default:
  return -1;
case bitc::BINOP_ADD:
  return IsFP ? Instruction::FAdd : Instruction::Add;
case bitc::BINOP_SUB:
  return IsFP ? Instruction::FSub : Instruction::Sub;
case bitc::BINOP_MUL:
  return IsFP ? Instruction::FMul : Instruction::Mul;
case bitc::BINOP_UDIV:
  return IsFP ? -1 : Instruction::UDiv;
case bitc::BINOP_SDIV:
  return IsFP ? Instruction::FDiv : Instruction::SDiv;
case bitc::BINOP_UREM:
  return IsFP ? -1 : Instruction::URem;
case bitc::BINOP_SREM:
  return IsFP ? Instruction::FRem : Instruction::SRem;
case bitc::BINOP_SHL:
  return IsFP ? -1 : Instruction::Shl;
case bitc::BINOP_LSHR:
  return IsFP ? -1 : Instruction::LShr;
case bitc::BINOP_ASHR:
  return IsFP ? -1 : Instruction::AShr;
case bitc::BINOP_AND:
  return IsFP ? -1 : Instruction::And;
case bitc::BINOP_OR:
  return IsFP ? -1 : Instruction::Or;
case bitc::BINOP_XOR:
  return IsFP ? -1 : Instruction::Xor;
}
1002}

1004static AtomicRMWInst::BinOp getDecodedRMWOperation(unsigned Val) {
switch (Val) {
default: return AtomicRMWInst::BAD_BINOP;
case bitc::RMW_XCHG: return AtomicRMWInst::Xchg;
case bitc::RMW_ADD: return AtomicRMWInst::Add;
case bitc::RMW_SUB: return AtomicRMWInst::Sub;
case bitc::RMW_AND: return AtomicRMWInst::And;
case bitc::RMW_NAND: return AtomicRMWInst::Nand;
case bitc::RMW_OR: return AtomicRMWInst::Or;
case bitc::RMW_XOR: return AtomicRMWInst::Xor;
case bitc::RMW_MAX: return AtomicRMWInst::Max;
case bitc::RMW_MIN: return AtomicRMWInst::Min;
case bitc::RMW_UMAX: return AtomicRMWInst::UMax;
case bitc::RMW_UMIN: return AtomicRMWInst::UMin;
}
1019}

1021static AtomicOrdering getDecodedOrdering(unsigned Val) {
switch (Val) {
case bitc::ORDERING_NOTATOMIC: return AtomicOrdering::NotAtomic;
case bitc::ORDERING_UNORDERED: return AtomicOrdering::Unordered;
case bitc::ORDERING_MONOTONIC: return AtomicOrdering::Monotonic;
case bitc::ORDERING_ACQUIRE: return AtomicOrdering::Acquire;
case bitc::ORDERING_RELEASE: return AtomicOrdering::Release;
case bitc::ORDERING_ACQREL: return AtomicOrdering::AcquireRelease;
default: // Map unknown orderings to sequentially-consistent.
case bitc::ORDERING_SEQCST: return AtomicOrdering::SequentiallyConsistent;
}
1032}

1034static Comdat::SelectionKind getDecodedComdatSelectionKind(unsigned Val) {
switch (Val) {
default: // Map unknown selection kinds to any.
case bitc::COMDAT_SELECTION_KIND_ANY:
  return Comdat::Any;
case bitc::COMDAT_SELECTION_KIND_EXACT_MATCH:
  return Comdat::ExactMatch;
case bitc::COMDAT_SELECTION_KIND_LARGEST:
  return Comdat::Largest;
case bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES:
  return Comdat::NoDuplicates;
case bitc::COMDAT_SELECTION_KIND_SAME_SIZE:
  return Comdat::SameSize;
}
1048}

1050static FastMathFlags getDecodedFastMathFlags(unsigned Val) {
FastMathFlags FMF;
if (0 != (Val & bitc::UnsafeAlgebra))
  FMF.setFast();
if (0 != (Val & bitc::AllowReassoc))
  FMF.setAllowReassoc();
if (0 != (Val & bitc::NoNaNs))
  FMF.setNoNaNs();
if (0 != (Val & bitc::NoInfs))
  FMF.setNoInfs();
if (0 != (Val & bitc::NoSignedZeros))
  FMF.setNoSignedZeros();
if (0 != (Val & bitc::AllowReciprocal))
  FMF.setAllowReciprocal();
if (0 != (Val & bitc::AllowContract))
  FMF.setAllowContract(true);
if (0 != (Val & bitc::ApproxFunc))
  FMF.setApproxFunc();
return FMF;
1069}

1071static void upgradeDLLImportExportLinkage(GlobalValue *GV, unsigned Val) {
switch (Val) {
case 5: GV->setDLLStorageClass(GlobalValue::DLLImportStorageClass); break;
case 6: GV->setDLLStorageClass(GlobalValue::DLLExportStorageClass); break;
}
1076}

1078Type *BitcodeReader::getTypeByID(unsigned ID) {
// The type table size is always specified correctly.
if (ID >= TypeList.size())
  return nullptr;

if (Type *Ty = TypeList[ID])
  return Ty;

// If we have a forward reference, the only possible case is when it is to a
// named struct.  Just create a placeholder for now.
return TypeList[ID] = createIdentifiedStructType(Context);
1089}

1091StructType *BitcodeReader::createIdentifiedStructType(LLVMContext &Context,
                                                    StringRef Name) {
auto *Ret = StructType::create(Context, Name);
IdentifiedStructTypes.push_back(Ret);
return Ret;
1096}

1098StructType *BitcodeReader::createIdentifiedStructType(LLVMContext &Context) {
auto *Ret = StructType::create(Context);
IdentifiedStructTypes.push_back(Ret);
return Ret;
1102}

1104//===----------------------------------------------------------------------===//
1105//  Functions for parsing blocks from the bitcode file
1106//===----------------------------------------------------------------------===//

1108static uint64_t getRawAttributeMask(Attribute::AttrKind Val) {
switch (Val) {
case Attribute::EndAttrKinds:
  llvm_unreachable("Synthetic enumerators which should never get here")::llvm::llvm_unreachable_internal("Synthetic enumerators which should never get here"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1111);

case Attribute::None:            return 0;
case Attribute::ZExt:            return 1 << 0;
case Attribute::SExt:            return 1 << 1;
case Attribute::NoReturn:        return 1 << 2;
case Attribute::InReg:           return 1 << 3;
case Attribute::StructRet:       return 1 << 4;
case Attribute::NoUnwind:        return 1 << 5;
case Attribute::NoAlias:         return 1 << 6;
case Attribute::ByVal:           return 1 << 7;
case Attribute::Nest:            return 1 << 8;
case Attribute::ReadNone:        return 1 << 9;
case Attribute::ReadOnly:        return 1 << 10;
case Attribute::NoInline:        return 1 << 11;
case Attribute::AlwaysInline:    return 1 << 12;
case Attribute::OptimizeForSize: return 1 << 13;
case Attribute::StackProtect:    return 1 << 14;
case Attribute::StackProtectReq: return 1 << 15;
case Attribute::Alignment:       return 31 << 16;
case Attribute::NoCapture:       return 1 << 21;
case Attribute::NoRedZone:       return 1 << 22;
case Attribute::NoImplicitFloat: return 1 << 23;
case Attribute::Naked:           return 1 << 24;
case Attribute::InlineHint:      return 1 << 25;
case Attribute::StackAlignment:  return 7 << 26;
case Attribute::ReturnsTwice:    return 1 << 29;
case Attribute::UWTable:         return 1 << 30;
case Attribute::NonLazyBind:     return 1U << 31;
case Attribute::SanitizeAddress: return 1ULL << 32;
case Attribute::MinSize:         return 1ULL << 33;
case Attribute::NoDuplicate:     return 1ULL << 34;
case Attribute::StackProtectStrong: return 1ULL << 35;
case Attribute::SanitizeThread:  return 1ULL << 36;
case Attribute::SanitizeMemory:  return 1ULL << 37;
case Attribute::NoBuiltin:       return 1ULL << 38;
case Attribute::Returned:        return 1ULL << 39;
case Attribute::Cold:            return 1ULL << 40;
case Attribute::Builtin:         return 1ULL << 41;
case Attribute::OptimizeNone:    return 1ULL << 42;
case Attribute::InAlloca:        return 1ULL << 43;
case Attribute::NonNull:         return 1ULL << 44;
case Attribute::JumpTable:       return 1ULL << 45;
case Attribute::Convergent:      return 1ULL << 46;
case Attribute::SafeStack:       return 1ULL << 47;
case Attribute::NoRecurse:       return 1ULL << 48;
case Attribute::InaccessibleMemOnly:         return 1ULL << 49;
case Attribute::InaccessibleMemOrArgMemOnly: return 1ULL << 50;
case Attribute::SwiftSelf:       return 1ULL << 51;
case Attribute::SwiftError:      return 1ULL << 52;
case Attribute::WriteOnly:       return 1ULL << 53;
case Attribute::Speculatable:    return 1ULL << 54;
case Attribute::StrictFP:        return 1ULL << 55;
case Attribute::SanitizeHWAddress: return 1ULL << 56;
case Attribute::NoCfCheck:       return 1ULL << 57;
case Attribute::OptForFuzzing:   return 1ULL << 58;
case Attribute::ShadowCallStack: return 1ULL << 59;
case Attribute::SpeculativeLoadHardening:
  return 1ULL << 60;
case Attribute::Dereferenceable:
  llvm_unreachable("dereferenceable attribute not supported in raw format")::llvm::llvm_unreachable_internal("dereferenceable attribute not supported in raw format"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1171);
  break;
case Attribute::DereferenceableOrNull:
  llvm_unreachable("dereferenceable_or_null attribute not supported in raw "::llvm::llvm_unreachable_internal("dereferenceable_or_null attribute not supported in raw "
 "format", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1175)
                   "format")::llvm::llvm_unreachable_internal("dereferenceable_or_null attribute not supported in raw "
 "format", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1175);
  break;
case Attribute::ArgMemOnly:
  llvm_unreachable("argmemonly attribute not supported in raw format")::llvm::llvm_unreachable_internal("argmemonly attribute not supported in raw format"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1178);
  break;
case Attribute::AllocSize:
  llvm_unreachable("allocsize not supported in raw format")::llvm::llvm_unreachable_internal("allocsize not supported in raw format"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1181);
  break;
}
llvm_unreachable("Unsupported attribute type")::llvm::llvm_unreachable_internal("Unsupported attribute type"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1184);
1185}

1187static void addRawAttributeValue(AttrBuilder &B, uint64_t Val) {
if (!Val) return;

for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
     I = Attribute::AttrKind(I + 1)) {
  if (I == Attribute::Dereferenceable ||
      I == Attribute::DereferenceableOrNull ||
      I == Attribute::ArgMemOnly ||
      I == Attribute::AllocSize)
    continue;
  if (uint64_t A = (Val & getRawAttributeMask(I))) {
    if (I == Attribute::Alignment)
      B.addAlignmentAttr(1ULL << ((A >> 16) - 1));
    else if (I == Attribute::StackAlignment)
      B.addStackAlignmentAttr(1ULL << ((A >> 26)-1));
    else
      B.addAttribute(I);
  }
}
1206}

1208/// This fills an AttrBuilder object with the LLVM attributes that have
1209/// been decoded from the given integer. This function must stay in sync with
1210/// 'encodeLLVMAttributesForBitcode'.
1211static void decodeLLVMAttributesForBitcode(AttrBuilder &B,
                                         uint64_t EncodedAttrs) {
// FIXME: Remove in 4.0.

// The alignment is stored as a 16-bit raw value from bits 31--16.  We shift
// the bits above 31 down by 11 bits.
unsigned Alignment = (EncodedAttrs & (0xffffULL << 16)) >> 16;
assert((!Alignment || isPowerOf2_32(Alignment)) &&(((!Alignment || isPowerOf2_32(Alignment)) && "Alignment must be a power of two."
) ? static_cast<void> (0) : __assert_fail ("(!Alignment || isPowerOf2_32(Alignment)) && \"Alignment must be a power of two.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1219, __PRETTY_FUNCTION__))
       "Alignment must be a power of two.")(((!Alignment || isPowerOf2_32(Alignment)) && "Alignment must be a power of two."
) ? static_cast<void> (0) : __assert_fail ("(!Alignment || isPowerOf2_32(Alignment)) && \"Alignment must be a power of two.\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1219, __PRETTY_FUNCTION__));

if (Alignment)
  B.addAlignmentAttr(Alignment);
addRawAttributeValue(B, ((EncodedAttrs & (0xfffffULL << 32)) >> 11) |
                        (EncodedAttrs & 0xffff));
1225}

1227Error BitcodeReader::parseAttributeBlock() {
if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
  return error("Invalid record");

if (!MAttributes.empty())
  return error("Invalid multiple blocks");

SmallVector<uint64_t, 64> Record;

SmallVector<AttributeList, 8> Attrs;

// Read all the records.
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:  // Default behavior: ignore.
    break;
  case bitc::PARAMATTR_CODE_ENTRY_OLD: // ENTRY: [paramidx0, attr0, ...]
    // FIXME: Remove in 4.0.
    if (Record.size() & 1)
      return error("Invalid record");

    for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
      AttrBuilder B;
      decodeLLVMAttributesForBitcode(B, Record[i+1]);
      Attrs.push_back(AttributeList::get(Context, Record[i], B));
    }

    MAttributes.push_back(AttributeList::get(Context, Attrs));
    Attrs.clear();
    break;
  case bitc::PARAMATTR_CODE_ENTRY: // ENTRY: [attrgrp0, attrgrp1, ...]
    for (unsigned i = 0, e = Record.size(); i != e; ++i)
      Attrs.push_back(MAttributeGroups[Record[i]]);

    MAttributes.push_back(AttributeList::get(Context, Attrs));
    Attrs.clear();
    break;
  }
}
1281}

1283// Returns Attribute::None on unrecognized codes.
1284static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
switch (Code) {
default:
  return Attribute::None;
case bitc::ATTR_KIND_ALIGNMENT:
  return Attribute::Alignment;
case bitc::ATTR_KIND_ALWAYS_INLINE:
  return Attribute::AlwaysInline;
case bitc::ATTR_KIND_ARGMEMONLY:
  return Attribute::ArgMemOnly;
case bitc::ATTR_KIND_BUILTIN:
  return Attribute::Builtin;
case bitc::ATTR_KIND_BY_VAL:
  return Attribute::ByVal;
case bitc::ATTR_KIND_IN_ALLOCA:
  return Attribute::InAlloca;
case bitc::ATTR_KIND_COLD:
  return Attribute::Cold;
case bitc::ATTR_KIND_CONVERGENT:
  return Attribute::Convergent;
case bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY:
  return Attribute::InaccessibleMemOnly;
case bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY:
  return Attribute::InaccessibleMemOrArgMemOnly;
case bitc::ATTR_KIND_INLINE_HINT:
  return Attribute::InlineHint;
case bitc::ATTR_KIND_IN_REG:
  return Attribute::InReg;
case bitc::ATTR_KIND_JUMP_TABLE:
  return Attribute::JumpTable;
case bitc::ATTR_KIND_MIN_SIZE:
  return Attribute::MinSize;
case bitc::ATTR_KIND_NAKED:
  return Attribute::Naked;
case bitc::ATTR_KIND_NEST:
  return Attribute::Nest;
case bitc::ATTR_KIND_NO_ALIAS:
  return Attribute::NoAlias;
case bitc::ATTR_KIND_NO_BUILTIN:
  return Attribute::NoBuiltin;
case bitc::ATTR_KIND_NO_CAPTURE:
  return Attribute::NoCapture;
case bitc::ATTR_KIND_NO_DUPLICATE:
  return Attribute::NoDuplicate;
case bitc::ATTR_KIND_NO_IMPLICIT_FLOAT:
  return Attribute::NoImplicitFloat;
case bitc::ATTR_KIND_NO_INLINE:
  return Attribute::NoInline;
case bitc::ATTR_KIND_NO_RECURSE:
  return Attribute::NoRecurse;
case bitc::ATTR_KIND_NON_LAZY_BIND:
  return Attribute::NonLazyBind;
case bitc::ATTR_KIND_NON_NULL:
  return Attribute::NonNull;
case bitc::ATTR_KIND_DEREFERENCEABLE:
  return Attribute::Dereferenceable;
case bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL:
  return Attribute::DereferenceableOrNull;
case bitc::ATTR_KIND_ALLOC_SIZE:
  return Attribute::AllocSize;
case bitc::ATTR_KIND_NO_RED_ZONE:
  return Attribute::NoRedZone;
case bitc::ATTR_KIND_NO_RETURN:
  return Attribute::NoReturn;
case bitc::ATTR_KIND_NOCF_CHECK:
  return Attribute::NoCfCheck;
case bitc::ATTR_KIND_NO_UNWIND:
  return Attribute::NoUnwind;
case bitc::ATTR_KIND_OPT_FOR_FUZZING:
  return Attribute::OptForFuzzing;
case bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE:
  return Attribute::OptimizeForSize;
case bitc::ATTR_KIND_OPTIMIZE_NONE:
  return Attribute::OptimizeNone;
case bitc::ATTR_KIND_READ_NONE:
  return Attribute::ReadNone;
case bitc::ATTR_KIND_READ_ONLY:
  return Attribute::ReadOnly;
case bitc::ATTR_KIND_RETURNED:
  return Attribute::Returned;
case bitc::ATTR_KIND_RETURNS_TWICE:
  return Attribute::ReturnsTwice;
case bitc::ATTR_KIND_S_EXT:
  return Attribute::SExt;
case bitc::ATTR_KIND_SPECULATABLE:
  return Attribute::Speculatable;
case bitc::ATTR_KIND_STACK_ALIGNMENT:
  return Attribute::StackAlignment;
case bitc::ATTR_KIND_STACK_PROTECT:
  return Attribute::StackProtect;
case bitc::ATTR_KIND_STACK_PROTECT_REQ:
  return Attribute::StackProtectReq;
case bitc::ATTR_KIND_STACK_PROTECT_STRONG:
  return Attribute::StackProtectStrong;
case bitc::ATTR_KIND_SAFESTACK:
  return Attribute::SafeStack;
case bitc::ATTR_KIND_SHADOWCALLSTACK:
  return Attribute::ShadowCallStack;
case bitc::ATTR_KIND_STRICT_FP:
  return Attribute::StrictFP;
case bitc::ATTR_KIND_STRUCT_RET:
  return Attribute::StructRet;
case bitc::ATTR_KIND_SANITIZE_ADDRESS:
  return Attribute::SanitizeAddress;
case bitc::ATTR_KIND_SANITIZE_HWADDRESS:
  return Attribute::SanitizeHWAddress;
case bitc::ATTR_KIND_SANITIZE_THREAD:
  return Attribute::SanitizeThread;
case bitc::ATTR_KIND_SANITIZE_MEMORY:
  return Attribute::SanitizeMemory;
case bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING:
  return Attribute::SpeculativeLoadHardening;
case bitc::ATTR_KIND_SWIFT_ERROR:
  return Attribute::SwiftError;
case bitc::ATTR_KIND_SWIFT_SELF:
  return Attribute::SwiftSelf;
case bitc::ATTR_KIND_UW_TABLE:
  return Attribute::UWTable;
case bitc::ATTR_KIND_WRITEONLY:
  return Attribute::WriteOnly;
case bitc::ATTR_KIND_Z_EXT:
  return Attribute::ZExt;
}
1407}

1409Error BitcodeReader::parseAlignmentValue(uint64_t Exponent,
                                       unsigned &Alignment) {
// Note: Alignment in bitcode files is incremented by 1, so that zero
// can be used for default alignment.
if (Exponent > Value::MaxAlignmentExponent + 1)
  return error("Invalid alignment value");
Alignment = (1 << static_cast<unsigned>(Exponent)) >> 1;
return Error::success();
1417}

1419Error BitcodeReader::parseAttrKind(uint64_t Code, Attribute::AttrKind *Kind) {
*Kind = getAttrFromCode(Code);
if (*Kind == Attribute::None)
  return error("Unknown attribute kind (" + Twine(Code) + ")");
return Error::success();
1424}

1426Error BitcodeReader::parseAttributeGroupBlock() {
if (Stream.EnterSubBlock(bitc::PARAMATTR_GROUP_BLOCK_ID))
  return error("Invalid record");

if (!MAttributeGroups.empty())
  return error("Invalid multiple blocks");

SmallVector<uint64_t, 64> Record;

// Read all the records.
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:  // Default behavior: ignore.
    break;
  case bitc::PARAMATTR_GRP_CODE_ENTRY: { // ENTRY: [grpid, idx, a0, a1, ...]
    if (Record.size() < 3)
      return error("Invalid record");

    uint64_t GrpID = Record[0];
    uint64_t Idx = Record[1]; // Index of the object this attribute refers to.

    AttrBuilder B;
    for (unsigned i = 2, e = Record.size(); i != e; ++i) {
      if (Record[i] == 0) {        // Enum attribute
        Attribute::AttrKind Kind;
        if (Error Err = parseAttrKind(Record[++i], &Kind))
          return Err;

        B.addAttribute(Kind);
      } else if (Record[i] == 1) { // Integer attribute
        Attribute::AttrKind Kind;
        if (Error Err = parseAttrKind(Record[++i], &Kind))
          return Err;
        if (Kind == Attribute::Alignment)
          B.addAlignmentAttr(Record[++i]);
        else if (Kind == Attribute::StackAlignment)
          B.addStackAlignmentAttr(Record[++i]);
        else if (Kind == Attribute::Dereferenceable)
          B.addDereferenceableAttr(Record[++i]);
        else if (Kind == Attribute::DereferenceableOrNull)
          B.addDereferenceableOrNullAttr(Record[++i]);
        else if (Kind == Attribute::AllocSize)
          B.addAllocSizeAttrFromRawRepr(Record[++i]);
      } else {                     // String attribute
        assert((Record[i] == 3 || Record[i] == 4) &&(((Record[i] == 3 || Record[i] == 4) && "Invalid attribute group entry"
) ? static_cast<void> (0) : __assert_fail ("(Record[i] == 3 || Record[i] == 4) && \"Invalid attribute group entry\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1486, __PRETTY_FUNCTION__))
               "Invalid attribute group entry")(((Record[i] == 3 || Record[i] == 4) && "Invalid attribute group entry"
) ? static_cast<void> (0) : __assert_fail ("(Record[i] == 3 || Record[i] == 4) && \"Invalid attribute group entry\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1486, __PRETTY_FUNCTION__));
        bool HasValue = (Record[i++] == 4);
        SmallString<64> KindStr;
        SmallString<64> ValStr;

        while (Record[i] != 0 && i != e)
          KindStr += Record[i++];
        assert(Record[i] == 0 && "Kind string not null terminated")((Record[i] == 0 && "Kind string not null terminated"
) ? static_cast<void> (0) : __assert_fail ("Record[i] == 0 && \"Kind string not null terminated\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1493, __PRETTY_FUNCTION__));

        if (HasValue) {
          // Has a value associated with it.
          ++i; // Skip the '0' that terminates the "kind" string.
          while (Record[i] != 0 && i != e)
            ValStr += Record[i++];
          assert(Record[i] == 0 && "Value string not null terminated")((Record[i] == 0 && "Value string not null terminated"
) ? static_cast<void> (0) : __assert_fail ("Record[i] == 0 && \"Value string not null terminated\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1500, __PRETTY_FUNCTION__));
        }

        B.addAttribute(KindStr.str(), ValStr.str());
      }
    }

    MAttributeGroups[GrpID] = AttributeList::get(Context, Idx, B);
    break;
  }
  }
}
1512}

1514Error BitcodeReader::parseTypeTable() {
if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID_NEW))
  return error("Invalid record");

return parseTypeTableBody();
1519}

1521Error BitcodeReader::parseTypeTableBody() {
if (!TypeList.empty())
  return error("Invalid multiple blocks");

SmallVector<uint64_t, 64> Record;
unsigned NumRecords = 0;

SmallString<64> TypeName;

// Read all the records for this type table.
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    if (NumRecords != TypeList.size())
      return error("Malformed block");
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  Type *ResultTy = nullptr;
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:
    return error("Invalid value");
  case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
    // TYPE_CODE_NUMENTRY contains a count of the number of types in the
    // type list.  This allows us to reserve space.
    if (Record.size() < 1)
      return error("Invalid record");
    TypeList.resize(Record[0]);
    continue;
  case bitc::TYPE_CODE_VOID:      // VOID
    ResultTy = Type::getVoidTy(Context);
    break;
  case bitc::TYPE_CODE_HALF:     // HALF
    ResultTy = Type::getHalfTy(Context);
    break;
  case bitc::TYPE_CODE_FLOAT:     // FLOAT
    ResultTy = Type::getFloatTy(Context);
    break;
  case bitc::TYPE_CODE_DOUBLE:    // DOUBLE
    ResultTy = Type::getDoubleTy(Context);
    break;
  case bitc::TYPE_CODE_X86_FP80:  // X86_FP80
    ResultTy = Type::getX86_FP80Ty(Context);
    break;
  case bitc::TYPE_CODE_FP128:     // FP128
    ResultTy = Type::getFP128Ty(Context);
    break;
  case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128
    ResultTy = Type::getPPC_FP128Ty(Context);
    break;
  case bitc::TYPE_CODE_LABEL:     // LABEL
    ResultTy = Type::getLabelTy(Context);
    break;
  case bitc::TYPE_CODE_METADATA:  // METADATA
    ResultTy = Type::getMetadataTy(Context);
    break;
  case bitc::TYPE_CODE_X86_MMX:   // X86_MMX
    ResultTy = Type::getX86_MMXTy(Context);
    break;
  case bitc::TYPE_CODE_TOKEN:     // TOKEN
    ResultTy = Type::getTokenTy(Context);
    break;
  case bitc::TYPE_CODE_INTEGER: { // INTEGER: [width]
    if (Record.size() < 1)
      return error("Invalid record");

    uint64_t NumBits = Record[0];
    if (NumBits < IntegerType::MIN_INT_BITS ||
        NumBits > IntegerType::MAX_INT_BITS)
      return error("Bitwidth for integer type out of range");
    ResultTy = IntegerType::get(Context, NumBits);
    break;
  }
  case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or
                                  //          [pointee type, address space]
    if (Record.size() < 1)
      return error("Invalid record");
    unsigned AddressSpace = 0;
    if (Record.size() == 2)
      AddressSpace = Record[1];
    ResultTy = getTypeByID(Record[0]);
    if (!ResultTy ||
        !PointerType::isValidElementType(ResultTy))
      return error("Invalid type");
    ResultTy = PointerType::get(ResultTy, AddressSpace);
    break;
  }
  case bitc::TYPE_CODE_FUNCTION_OLD: {
    // FIXME: attrid is dead, remove it in LLVM 4.0
    // FUNCTION: [vararg, attrid, retty, paramty x N]
    if (Record.size() < 3)
      return error("Invalid record");
    SmallVector<Type*, 8> ArgTys;
    for (unsigned i = 3, e = Record.size(); i != e; ++i) {
      if (Type *T = getTypeByID(Record[i]))
        ArgTys.push_back(T);
      else
        break;
    }

    ResultTy = getTypeByID(Record[2]);
    if (!ResultTy || ArgTys.size() < Record.size()-3)
      return error("Invalid type");

    ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]);
    break;
  }
  case bitc::TYPE_CODE_FUNCTION: {
    // FUNCTION: [vararg, retty, paramty x N]
    if (Record.size() < 2)
      return error("Invalid record");
    SmallVector<Type*, 8> ArgTys;
    for (unsigned i = 2, e = Record.size(); i != e; ++i) {
      if (Type *T = getTypeByID(Record[i])) {
        if (!FunctionType::isValidArgumentType(T))
          return error("Invalid function argument type");
        ArgTys.push_back(T);
      }
      else
        break;
    }

    ResultTy = getTypeByID(Record[1]);
    if (!ResultTy || ArgTys.size() < Record.size()-2)
      return error("Invalid type");

    ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]);
    break;
  }
  case bitc::TYPE_CODE_STRUCT_ANON: {  // STRUCT: [ispacked, eltty x N]
    if (Record.size() < 1)
      return error("Invalid record");
    SmallVector<Type*, 8> EltTys;
    for (unsigned i = 1, e = Record.size(); i != e; ++i) {
      if (Type *T = getTypeByID(Record[i]))
        EltTys.push_back(T);
      else
        break;
    }
    if (EltTys.size() != Record.size()-1)
      return error("Invalid type");
    ResultTy = StructType::get(Context, EltTys, Record[0]);
    break;
  }
  case bitc::TYPE_CODE_STRUCT_NAME:   // STRUCT_NAME: [strchr x N]
    if (convertToString(Record, 0, TypeName))
      return error("Invalid record");
    continue;

  case bitc::TYPE_CODE_STRUCT_NAMED: { // STRUCT: [ispacked, eltty x N]
    if (Record.size() < 1)
      return error("Invalid record");

    if (NumRecords >= TypeList.size())
      return error("Invalid TYPE table");

    // Check to see if this was forward referenced, if so fill in the temp.
    StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]);
    if (Res) {
      Res->setName(TypeName);
      TypeList[NumRecords] = nullptr;
    } else  // Otherwise, create a new struct.
      Res = createIdentifiedStructType(Context, TypeName);
    TypeName.clear();

    SmallVector<Type*, 8> EltTys;
    for (unsigned i = 1, e = Record.size(); i != e; ++i) {
      if (Type *T = getTypeByID(Record[i]))
        EltTys.push_back(T);
      else
        break;
    }
    if (EltTys.size() != Record.size()-1)
      return error("Invalid record");
    Res->setBody(EltTys, Record[0]);
    ResultTy = Res;
    break;
  }
  case bitc::TYPE_CODE_OPAQUE: {       // OPAQUE: []
    if (Record.size() != 1)
      return error("Invalid record");

    if (NumRecords >= TypeList.size())
      return error("Invalid TYPE table");

    // Check to see if this was forward referenced, if so fill in the temp.
    StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]);
    if (Res) {
      Res->setName(TypeName);
      TypeList[NumRecords] = nullptr;
    } else  // Otherwise, create a new struct with no body.
      Res = createIdentifiedStructType(Context, TypeName);
    TypeName.clear();
    ResultTy = Res;
    break;
  }
  case bitc::TYPE_CODE_ARRAY:     // ARRAY: [numelts, eltty]
    if (Record.size() < 2)
      return error("Invalid record");
    ResultTy = getTypeByID(Record[1]);
    if (!ResultTy || !ArrayType::isValidElementType(ResultTy))
      return error("Invalid type");
    ResultTy = ArrayType::get(ResultTy, Record[0]);
    break;
  case bitc::TYPE_CODE_VECTOR:    // VECTOR: [numelts, eltty]
    if (Record.size() < 2)
      return error("Invalid record");
    if (Record[0] == 0)
      return error("Invalid vector length");
    ResultTy = getTypeByID(Record[1]);
    if (!ResultTy || !StructType::isValidElementType(ResultTy))
      return error("Invalid type");
    ResultTy = VectorType::get(ResultTy, Record[0]);
    break;
  }

  if (NumRecords >= TypeList.size())
    return error("Invalid TYPE table");
  if (TypeList[NumRecords])
    return error(
        "Invalid TYPE table: Only named structs can be forward referenced");
  assert(ResultTy && "Didn't read a type?")((ResultTy && "Didn't read a type?") ? static_cast<
void> (0) : __assert_fail ("ResultTy && \"Didn't read a type?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1752, __PRETTY_FUNCTION__));
  TypeList[NumRecords++] = ResultTy;
}
1755}

1757Error BitcodeReader::parseOperandBundleTags() {
if (Stream.EnterSubBlock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID))
  return error("Invalid record");

if (!BundleTags.empty())
  return error("Invalid multiple blocks");

SmallVector<uint64_t, 64> Record;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Tags are implicitly mapped to integers by their order.

  if (Stream.readRecord(Entry.ID, Record) != bitc::OPERAND_BUNDLE_TAG)
    return error("Invalid record");

  // OPERAND_BUNDLE_TAG: [strchr x N]
  BundleTags.emplace_back();
  if (convertToString(Record, 0, BundleTags.back()))
    return error("Invalid record");
  Record.clear();
}
1791}

1793Error BitcodeReader::parseSyncScopeNames() {
if (Stream.EnterSubBlock(bitc::SYNC_SCOPE_NAMES_BLOCK_ID))
  return error("Invalid record");

if (!SSIDs.empty())
  return error("Invalid multiple synchronization scope names blocks");

SmallVector<uint64_t, 64> Record;
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    if (SSIDs.empty())
      return error("Invalid empty synchronization scope names block");
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Synchronization scope names are implicitly mapped to synchronization
  // scope IDs by their order.

  if (Stream.readRecord(Entry.ID, Record) != bitc::SYNC_SCOPE_NAME)
    return error("Invalid record");

  SmallString<16> SSN;
  if (convertToString(Record, 0, SSN))
    return error("Invalid record");

  SSIDs.push_back(Context.getOrInsertSyncScopeID(SSN));
  Record.clear();
}
1829}

1831/// Associate a value with its name from the given index in the provided record.
1832Expected<Value *> BitcodeReader::recordValue(SmallVectorImpl<uint64_t> &Record,
                                           unsigned NameIndex, Triple &TT) {
SmallString<128> ValueName;
if (convertToString(Record, NameIndex, ValueName))
  return error("Invalid record");
unsigned ValueID = Record[0];
if (ValueID >= ValueList.size() || !ValueList[ValueID])
  return error("Invalid record");
Value *V = ValueList[ValueID];

StringRef NameStr(ValueName.data(), ValueName.size());
if (NameStr.find_first_of(0) != StringRef::npos)
  return error("Invalid value name");
V->setName(NameStr);
auto *GO = dyn_cast<GlobalObject>(V);
if (GO) {
  if (GO->getComdat() == reinterpret_cast<Comdat *>(1)) {
    if (TT.supportsCOMDAT())
      GO->setComdat(TheModule->getOrInsertComdat(V->getName()));
    else
      GO->setComdat(nullptr);
  }
}
return V;
1856}

1858/// Helper to note and return the current location, and jump to the given
1859/// offset.
1860static uint64_t jumpToValueSymbolTable(uint64_t Offset,
                                     BitstreamCursor &Stream) {
// Save the current parsing location so we can jump back at the end
// of the VST read.
uint64_t CurrentBit = Stream.GetCurrentBitNo();
Stream.JumpToBit(Offset * 32);
1866#ifndef NDEBUG
// Do some checking if we are in debug mode.
BitstreamEntry Entry = Stream.advance();
assert(Entry.Kind == BitstreamEntry::SubBlock)((Entry.Kind == BitstreamEntry::SubBlock) ? static_cast<void
> (0) : __assert_fail ("Entry.Kind == BitstreamEntry::SubBlock"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1869, __PRETTY_FUNCTION__));
assert(Entry.ID == bitc::VALUE_SYMTAB_BLOCK_ID)((Entry.ID == bitc::VALUE_SYMTAB_BLOCK_ID) ? static_cast<void
> (0) : __assert_fail ("Entry.ID == bitc::VALUE_SYMTAB_BLOCK_ID"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1870, __PRETTY_FUNCTION__));
1871#else
// In NDEBUG mode ignore the output so we don't get an unused variable
// warning.
Stream.advance();
1875#endif
return CurrentBit;
1877}

1879void BitcodeReader::setDeferredFunctionInfo(unsigned FuncBitcodeOffsetDelta,
                                          Function *F,
                                          ArrayRef<uint64_t> Record) {
// Note that we subtract 1 here because the offset is relative to one word
// before the start of the identification or module block, which was
// historically always the start of the regular bitcode header.
uint64_t FuncWordOffset = Record[1] - 1;
uint64_t FuncBitOffset = FuncWordOffset * 32;
DeferredFunctionInfo[F] = FuncBitOffset + FuncBitcodeOffsetDelta;
// Set the LastFunctionBlockBit to point to the last function block.
// Later when parsing is resumed after function materialization,
// we can simply skip that last function block.
if (FuncBitOffset > LastFunctionBlockBit)
  LastFunctionBlockBit = FuncBitOffset;
1893}

1895/// Read a new-style GlobalValue symbol table.
1896Error BitcodeReader::parseGlobalValueSymbolTable() {
unsigned FuncBitcodeOffsetDelta =
    Stream.getAbbrevIDWidth() + bitc::BlockIDWidth;

if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;
while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock:
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    break;
  }

  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  case bitc::VST_CODE_FNENTRY: // [valueid, offset]
    setDeferredFunctionInfo(FuncBitcodeOffsetDelta,
                            cast<Function>(ValueList[Record[0]]), Record);
    break;
  }
}
1925}

1927/// Parse the value symbol table at either the current parsing location or
1928/// at the given bit offset if provided.
1929Error BitcodeReader::parseValueSymbolTable(uint64_t Offset) {
uint64_t CurrentBit;
// Pass in the Offset to distinguish between calling for the module-level
// VST (where we want to jump to the VST offset) and the function-level
// VST (where we don't).
if (Offset > 0) {
  CurrentBit = jumpToValueSymbolTable(Offset, Stream);
  // If this module uses a string table, read this as a module-level VST.
  if (UseStrtab) {
    if (Error Err = parseGlobalValueSymbolTable())
      return Err;
    Stream.JumpToBit(CurrentBit);
    return Error::success();
  }
  // Otherwise, the VST will be in a similar format to a function-level VST,
  // and will contain symbol names.
}

// Compute the delta between the bitcode indices in the VST (the word offset
// to the word-aligned ENTER_SUBBLOCK for the function block, and that
// expected by the lazy reader. The reader's EnterSubBlock expects to have
// already read the ENTER_SUBBLOCK code (size getAbbrevIDWidth) and BlockID
// (size BlockIDWidth). Note that we access the stream's AbbrevID width here
// just before entering the VST subblock because: 1) the EnterSubBlock
// changes the AbbrevID width; 2) the VST block is nested within the same
// outer MODULE_BLOCK as the FUNCTION_BLOCKs and therefore have the same
// AbbrevID width before calling EnterSubBlock; and 3) when we want to
// jump to the FUNCTION_BLOCK using this offset later, we don't want
// to rely on the stream's AbbrevID width being that of the MODULE_BLOCK.
unsigned FuncBitcodeOffsetDelta =
    Stream.getAbbrevIDWidth() + bitc::BlockIDWidth;

if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

Triple TT(TheModule->getTargetTriple());

// Read all the records for this value table.
SmallString<128> ValueName;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    if (Offset > 0)
      Stream.JumpToBit(CurrentBit);
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:  // Default behavior: unknown type.
    break;
  case bitc::VST_CODE_ENTRY: {  // VST_CODE_ENTRY: [valueid, namechar x N]
    Expected<Value *> ValOrErr = recordValue(Record, 1, TT);
    if (Error Err = ValOrErr.takeError())
      return Err;
    ValOrErr.get();
    break;
  }
  case bitc::VST_CODE_FNENTRY: {
    // VST_CODE_FNENTRY: [valueid, offset, namechar x N]
    Expected<Value *> ValOrErr = recordValue(Record, 2, TT);
    if (Error Err = ValOrErr.takeError())
      return Err;
    Value *V = ValOrErr.get();

    // Ignore function offsets emitted for aliases of functions in older
    // versions of LLVM.
    if (auto *F = dyn_cast<Function>(V))
      setDeferredFunctionInfo(FuncBitcodeOffsetDelta, F, Record);
    break;
  }
  case bitc::VST_CODE_BBENTRY: {
    if (convertToString(Record, 1, ValueName))
      return error("Invalid record");
    BasicBlock *BB = getBasicBlock(Record[0]);
    if (!BB)
      return error("Invalid record");

    BB->setName(StringRef(ValueName.data(), ValueName.size()));
    ValueName.clear();
    break;
  }
  }
}
2025}

2027/// Decode a signed value stored with the sign bit in the LSB for dense VBR
2028/// encoding.
2029uint64_t BitcodeReader::decodeSignRotatedValue(uint64_t V) {
if ((V & 1) == 0)
  return V >> 1;
if (V != 1)
  return -(V >> 1);
// There is no such thing as -0 with integers.  "-0" really means MININT.
return 1ULL << 63;
2036}

2038/// Resolve all of the initializers for global values and aliases that we can.
2039Error BitcodeReader::resolveGlobalAndIndirectSymbolInits() {
std::vector<std::pair<GlobalVariable *, unsigned>> GlobalInitWorklist;
std::vector<std::pair<GlobalIndirectSymbol *, unsigned>>
    IndirectSymbolInitWorklist;
std::vector<std::pair<Function *, unsigned>> FunctionPrefixWorklist;
std::vector<std::pair<Function *, unsigned>> FunctionPrologueWorklist;
std::vector<std::pair<Function *, unsigned>> FunctionPersonalityFnWorklist;

GlobalInitWorklist.swap(GlobalInits);
IndirectSymbolInitWorklist.swap(IndirectSymbolInits);
FunctionPrefixWorklist.swap(FunctionPrefixes);
FunctionPrologueWorklist.swap(FunctionPrologues);
FunctionPersonalityFnWorklist.swap(FunctionPersonalityFns);

while (!GlobalInitWorklist.empty()) {
  unsigned ValID = GlobalInitWorklist.back().second;
  if (ValID >= ValueList.size()) {
    // Not ready to resolve this yet, it requires something later in the file.
    GlobalInits.push_back(GlobalInitWorklist.back());
  } else {
    if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
      GlobalInitWorklist.back().first->setInitializer(C);
    else
      return error("Expected a constant");
  }
  GlobalInitWorklist.pop_back();
}

while (!IndirectSymbolInitWorklist.empty()) {
  unsigned ValID = IndirectSymbolInitWorklist.back().second;
  if (ValID >= ValueList.size()) {
    IndirectSymbolInits.push_back(IndirectSymbolInitWorklist.back());
  } else {
    Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]);
    if (!C)
      return error("Expected a constant");
    GlobalIndirectSymbol *GIS = IndirectSymbolInitWorklist.back().first;
    if (isa<GlobalAlias>(GIS) && C->getType() != GIS->getType())
      return error("Alias and aliasee types don't match");
    GIS->setIndirectSymbol(C);
  }
  IndirectSymbolInitWorklist.pop_back();
}

while (!FunctionPrefixWorklist.empty()) {
  unsigned ValID = FunctionPrefixWorklist.back().second;
  if (ValID >= ValueList.size()) {
    FunctionPrefixes.push_back(FunctionPrefixWorklist.back());
  } else {
    if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
      FunctionPrefixWorklist.back().first->setPrefixData(C);
    else
      return error("Expected a constant");
  }
  FunctionPrefixWorklist.pop_back();
}

while (!FunctionPrologueWorklist.empty()) {
  unsigned ValID = FunctionPrologueWorklist.back().second;
  if (ValID >= ValueList.size()) {
    FunctionPrologues.push_back(FunctionPrologueWorklist.back());
  } else {
    if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
      FunctionPrologueWorklist.back().first->setPrologueData(C);
    else
      return error("Expected a constant");
  }
  FunctionPrologueWorklist.pop_back();
}

while (!FunctionPersonalityFnWorklist.empty()) {
  unsigned ValID = FunctionPersonalityFnWorklist.back().second;
  if (ValID >= ValueList.size()) {
    FunctionPersonalityFns.push_back(FunctionPersonalityFnWorklist.back());
  } else {
    if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
      FunctionPersonalityFnWorklist.back().first->setPersonalityFn(C);
    else
      return error("Expected a constant");
  }
  FunctionPersonalityFnWorklist.pop_back();
}

return Error::success();
2123}

2125static APInt readWideAPInt(ArrayRef<uint64_t> Vals, unsigned TypeBits) {
SmallVector<uint64_t, 8> Words(Vals.size());
transform(Vals, Words.begin(),
               BitcodeReader::decodeSignRotatedValue);

return APInt(TypeBits, Words);
2131}

2133Error BitcodeReader::parseConstants() {
if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

// Read all the records for this value table.
Type *CurTy = Type::getInt32Ty(Context);
unsigned NextCstNo = ValueList.size();

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    if (NextCstNo != ValueList.size())
      return error("Invalid constant reference");

    // Once all the constants have been read, go through and resolve forward
    // references.
    ValueList.resolveConstantForwardRefs();
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  Type *VoidType = Type::getVoidTy(Context);
  Value *V = nullptr;
  unsigned BitCode = Stream.readRecord(Entry.ID, Record);
  switch (BitCode) {
  default:  // Default behavior: unknown constant
  case bitc::CST_CODE_UNDEF:     // UNDEF
    V = UndefValue::get(CurTy);
    break;
  case bitc::CST_CODE_SETTYPE:   // SETTYPE: [typeid]
    if (Record.empty())
      return error("Invalid record");
    if (Record[0] >= TypeList.size() || !TypeList[Record[0]])
      return error("Invalid record");
    if (TypeList[Record[0]] == VoidType)
      return error("Invalid constant type");
    CurTy = TypeList[Record[0]];
    continue;  // Skip the ValueList manipulation.
  case bitc::CST_CODE_NULL:      // NULL
    V = Constant::getNullValue(CurTy);
    break;
  case bitc::CST_CODE_INTEGER:   // INTEGER: [intval]
    if (!CurTy->isIntegerTy() || Record.empty())
      return error("Invalid record");
    V = ConstantInt::get(CurTy, decodeSignRotatedValue(Record[0]));
    break;
  case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval]
    if (!CurTy->isIntegerTy() || Record.empty())
      return error("Invalid record");

    APInt VInt =
        readWideAPInt(Record, cast<IntegerType>(CurTy)->getBitWidth());
    V = ConstantInt::get(Context, VInt);

    break;
  }
  case bitc::CST_CODE_FLOAT: {    // FLOAT: [fpval]
    if (Record.empty())
      return error("Invalid record");
    if (CurTy->isHalfTy())
      V = ConstantFP::get(Context, APFloat(APFloat::IEEEhalf(),
                                           APInt(16, (uint16_t)Record[0])));
    else if (CurTy->isFloatTy())
      V = ConstantFP::get(Context, APFloat(APFloat::IEEEsingle(),
                                           APInt(32, (uint32_t)Record[0])));
    else if (CurTy->isDoubleTy())
      V = ConstantFP::get(Context, APFloat(APFloat::IEEEdouble(),
                                           APInt(64, Record[0])));
    else if (CurTy->isX86_FP80Ty()) {
      // Bits are not stored the same way as a normal i80 APInt, compensate.
      uint64_t Rearrange[2];
      Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16);
      Rearrange[1] = Record[0] >> 48;
      V = ConstantFP::get(Context, APFloat(APFloat::x87DoubleExtended(),
                                           APInt(80, Rearrange)));
    } else if (CurTy->isFP128Ty())
      V = ConstantFP::get(Context, APFloat(APFloat::IEEEquad(),
                                           APInt(128, Record)));
    else if (CurTy->isPPC_FP128Ty())
      V = ConstantFP::get(Context, APFloat(APFloat::PPCDoubleDouble(),
                                           APInt(128, Record)));
    else
      V = UndefValue::get(CurTy);
    break;
  }

  case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number]
    if (Record.empty())
      return error("Invalid record");

    unsigned Size = Record.size();
    SmallVector<Constant*, 16> Elts;

    if (StructType *STy = dyn_cast<StructType>(CurTy)) {
      for (unsigned i = 0; i != Size; ++i)
        Elts.push_back(ValueList.getConstantFwdRef(Record[i],
                                                   STy->getElementType(i)));
      V = ConstantStruct::get(STy, Elts);
    } else if (ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
      Type *EltTy = ATy->getElementType();
      for (unsigned i = 0; i != Size; ++i)
        Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
      V = ConstantArray::get(ATy, Elts);
    } else if (VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
      Type *EltTy = VTy->getElementType();
      for (unsigned i = 0; i != Size; ++i)
        Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
      V = ConstantVector::get(Elts);
    } else {
      V = UndefValue::get(CurTy);
    }
    break;
  }
  case bitc::CST_CODE_STRING:    // STRING: [values]
  case bitc::CST_CODE_CSTRING: { // CSTRING: [values]
    if (Record.empty())
      return error("Invalid record");

    SmallString<16> Elts(Record.begin(), Record.end());
    V = ConstantDataArray::getString(Context, Elts,
                                     BitCode == bitc::CST_CODE_CSTRING);
    break;
  }
  case bitc::CST_CODE_DATA: {// DATA: [n x value]
    if (Record.empty())
      return error("Invalid record");

    Type *EltTy = cast<SequentialType>(CurTy)->getElementType();
    if (EltTy->isIntegerTy(8)) {
      SmallVector<uint8_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::get(Context, Elts);
      else
        V = ConstantDataArray::get(Context, Elts);
    } else if (EltTy->isIntegerTy(16)) {
      SmallVector<uint16_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::get(Context, Elts);
      else
        V = ConstantDataArray::get(Context, Elts);
    } else if (EltTy->isIntegerTy(32)) {
      SmallVector<uint32_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::get(Context, Elts);
      else
        V = ConstantDataArray::get(Context, Elts);
    } else if (EltTy->isIntegerTy(64)) {
      SmallVector<uint64_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::get(Context, Elts);
      else
        V = ConstantDataArray::get(Context, Elts);
    } else if (EltTy->isHalfTy()) {
      SmallVector<uint16_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::getFP(Context, Elts);
      else
        V = ConstantDataArray::getFP(Context, Elts);
    } else if (EltTy->isFloatTy()) {
      SmallVector<uint32_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::getFP(Context, Elts);
      else
        V = ConstantDataArray::getFP(Context, Elts);
    } else if (EltTy->isDoubleTy()) {
      SmallVector<uint64_t, 16> Elts(Record.begin(), Record.end());
      if (isa<VectorType>(CurTy))
        V = ConstantDataVector::getFP(Context, Elts);
      else
        V = ConstantDataArray::getFP(Context, Elts);
    } else {
      return error("Invalid type for value");
    }
    break;
  }
  case bitc::CST_CODE_CE_BINOP: {  // CE_BINOP: [opcode, opval, opval]
    if (Record.size() < 3)
      return error("Invalid record");
    int Opc = getDecodedBinaryOpcode(Record[0], CurTy);
    if (Opc < 0) {
      V = UndefValue::get(CurTy);  // Unknown binop.
    } else {
      Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
      Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy);
      unsigned Flags = 0;
      if (Record.size() >= 4) {
        if (Opc == Instruction::Add ||
            Opc == Instruction::Sub ||
            Opc == Instruction::Mul ||
            Opc == Instruction::Shl) {
          if (Record[3] & (1 << bitc::OBO_NO_SIGNED_WRAP))
            Flags |= OverflowingBinaryOperator::NoSignedWrap;
          if (Record[3] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
            Flags |= OverflowingBinaryOperator::NoUnsignedWrap;
        } else if (Opc == Instruction::SDiv ||
                   Opc == Instruction::UDiv ||
                   Opc == Instruction::LShr ||
                   Opc == Instruction::AShr) {
          if (Record[3] & (1 << bitc::PEO_EXACT))
            Flags |= SDivOperator::IsExact;
        }
      }
      V = ConstantExpr::get(Opc, LHS, RHS, Flags);
    }
    break;
  }
  case bitc::CST_CODE_CE_CAST: {  // CE_CAST: [opcode, opty, opval]
    if (Record.size() < 3)
      return error("Invalid record");
    int Opc = getDecodedCastOpcode(Record[0]);
    if (Opc < 0) {
      V = UndefValue::get(CurTy);  // Unknown cast.
    } else {
      Type *OpTy = getTypeByID(Record[1]);
      if (!OpTy)
        return error("Invalid record");
      Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy);
      V = UpgradeBitCastExpr(Opc, Op, CurTy);
      if (!V) V = ConstantExpr::getCast(Opc, Op, CurTy);
    }
    break;
  }
  case bitc::CST_CODE_CE_INBOUNDS_GEP: // [ty, n x operands]
  case bitc::CST_CODE_CE_GEP: // [ty, n x operands]
  case bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX: { // [ty, flags, n x
                                                   // operands]
    unsigned OpNum = 0;
    Type *PointeeType = nullptr;
    if (BitCode == bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX ||
        Record.size() % 2)
      PointeeType = getTypeByID(Record[OpNum++]);

    bool InBounds = false;
    Optional<unsigned> InRangeIndex;
    if (BitCode == bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX) {
      uint64_t Op = Record[OpNum++];
      InBounds = Op & 1;
      InRangeIndex = Op >> 1;
    } else if (BitCode == bitc::CST_CODE_CE_INBOUNDS_GEP)
      InBounds = true;

    SmallVector<Constant*, 16> Elts;
    while (OpNum != Record.size()) {
      Type *ElTy = getTypeByID(Record[OpNum++]);
      if (!ElTy)
        return error("Invalid record");
      Elts.push_back(ValueList.getConstantFwdRef(Record[OpNum++], ElTy));
    }

    if (PointeeType &&
        PointeeType !=
            cast<PointerType>(Elts[0]->getType()->getScalarType())
                ->getElementType())
      return error("Explicit gep operator type does not match pointee type "
                   "of pointer operand");

    if (Elts.size() < 1)
      return error("Invalid gep with no operands");

    ArrayRef<Constant *> Indices(Elts.begin() + 1, Elts.end());
    V = ConstantExpr::getGetElementPtr(PointeeType, Elts[0], Indices,
                                       InBounds, InRangeIndex);
    break;
  }
  case bitc::CST_CODE_CE_SELECT: {  // CE_SELECT: [opval#, opval#, opval#]
    if (Record.size() < 3)
      return error("Invalid record");

    Type *SelectorTy = Type::getInt1Ty(Context);

    // The selector might be an i1 or an <n x i1>
    // Get the type from the ValueList before getting a forward ref.
    if (VectorType *VTy = dyn_cast<VectorType>(CurTy))
      if (Value *V = ValueList[Record[0]])
        if (SelectorTy != V->getType())
          SelectorTy = VectorType::get(SelectorTy, VTy->getNumElements());

    V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
                                                            SelectorTy),
                                ValueList.getConstantFwdRef(Record[1],CurTy),
                                ValueList.getConstantFwdRef(Record[2],CurTy));
    break;
  }
  case bitc::CST_CODE_CE_EXTRACTELT
      : { // CE_EXTRACTELT: [opty, opval, opty, opval]
    if (Record.size() < 3)
      return error("Invalid record");
    VectorType *OpTy =
      dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
    if (!OpTy)
      return error("Invalid record");
    Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
    Constant *Op1 = nullptr;
    if (Record.size() == 4) {
      Type *IdxTy = getTypeByID(Record[2]);
      if (!IdxTy)
        return error("Invalid record");
      Op1 = ValueList.getConstantFwdRef(Record[3], IdxTy);
    } else // TODO: Remove with llvm 4.0
      Op1 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context));
    if (!Op1)
      return error("Invalid record");
    V = ConstantExpr::getExtractElement(Op0, Op1);
    break;
  }
  case bitc::CST_CODE_CE_INSERTELT
      : { // CE_INSERTELT: [opval, opval, opty, opval]
    VectorType *OpTy = dyn_cast<VectorType>(CurTy);
    if (Record.size() < 3 || !OpTy)
      return error("Invalid record");
    Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
    Constant *Op1 = ValueList.getConstantFwdRef(Record[1],
                                                OpTy->getElementType());
    Constant *Op2 = nullptr;
    if (Record.size() == 4) {
      Type *IdxTy = getTypeByID(Record[2]);
      if (!IdxTy)
        return error("Invalid record");
      Op2 = ValueList.getConstantFwdRef(Record[3], IdxTy);
    } else // TODO: Remove with llvm 4.0
      Op2 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context));
    if (!Op2)
      return error("Invalid record");
    V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
    break;
  }
  case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
    VectorType *OpTy = dyn_cast<VectorType>(CurTy);
    if (Record.size() < 3 || !OpTy)
      return error("Invalid record");
    Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
    Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy);
    Type *ShufTy = VectorType::get(Type::getInt32Ty(Context),
                                               OpTy->getNumElements());
    Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy);
    V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
    break;
  }
  case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval]
    VectorType *RTy = dyn_cast<VectorType>(CurTy);
    VectorType *OpTy =
      dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
    if (Record.size() < 4 || !RTy || !OpTy)
      return error("Invalid record");
    Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
    Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
    Type *ShufTy = VectorType::get(Type::getInt32Ty(Context),
                                               RTy->getNumElements());
    Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy);
    V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
    break;
  }
  case bitc::CST_CODE_CE_CMP: {     // CE_CMP: [opty, opval, opval, pred]
    if (Record.size() < 4)
      return error("Invalid record");
    Type *OpTy = getTypeByID(Record[0]);
    if (!OpTy)
      return error("Invalid record");
    Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
    Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);

    if (OpTy->isFPOrFPVectorTy())
      V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
    else
      V = ConstantExpr::getICmp(Record[3], Op0, Op1);
    break;
  }
  // This maintains backward compatibility, pre-asm dialect keywords.
  // FIXME: Remove with the 4.0 release.
  case bitc::CST_CODE_INLINEASM_OLD: {
    if (Record.size() < 2)
      return error("Invalid record");
    std::string AsmStr, ConstrStr;
    bool HasSideEffects = Record[0] & 1;
    bool IsAlignStack = Record[0] >> 1;
    unsigned AsmStrSize = Record[1];
    if (2+AsmStrSize >= Record.size())
      return error("Invalid record");
    unsigned ConstStrSize = Record[2+AsmStrSize];
    if (3+AsmStrSize+ConstStrSize > Record.size())
      return error("Invalid record");

    for (unsigned i = 0; i != AsmStrSize; ++i)
      AsmStr += (char)Record[2+i];
    for (unsigned i = 0; i != ConstStrSize; ++i)
      ConstrStr += (char)Record[3+AsmStrSize+i];
    PointerType *PTy = cast<PointerType>(CurTy);
    UpgradeInlineAsmString(&AsmStr);
    V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
                       AsmStr, ConstrStr, HasSideEffects, IsAlignStack);
    break;
  }
  // This version adds support for the asm dialect keywords (e.g.,
  // inteldialect).
  case bitc::CST_CODE_INLINEASM: {
    if (Record.size() < 2)
      return error("Invalid record");
    std::string AsmStr, ConstrStr;
    bool HasSideEffects = Record[0] & 1;
    bool IsAlignStack = (Record[0] >> 1) & 1;
    unsigned AsmDialect = Record[0] >> 2;
    unsigned AsmStrSize = Record[1];
    if (2+AsmStrSize >= Record.size())
      return error("Invalid record");
    unsigned ConstStrSize = Record[2+AsmStrSize];
    if (3+AsmStrSize+ConstStrSize > Record.size())
      return error("Invalid record");

    for (unsigned i = 0; i != AsmStrSize; ++i)
      AsmStr += (char)Record[2+i];
    for (unsigned i = 0; i != ConstStrSize; ++i)
      ConstrStr += (char)Record[3+AsmStrSize+i];
    PointerType *PTy = cast<PointerType>(CurTy);
    UpgradeInlineAsmString(&AsmStr);
    V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
                       AsmStr, ConstrStr, HasSideEffects, IsAlignStack,
                       InlineAsm::AsmDialect(AsmDialect));
    break;
  }
  case bitc::CST_CODE_BLOCKADDRESS:{
    if (Record.size() < 3)
      return error("Invalid record");
    Type *FnTy = getTypeByID(Record[0]);
    if (!FnTy)
      return error("Invalid record");
    Function *Fn =
      dyn_cast_or_null<Function>(ValueList.getConstantFwdRef(Record[1],FnTy));
    if (!Fn)
      return error("Invalid record");

    // If the function is already parsed we can insert the block address right
    // away.
    BasicBlock *BB;
    unsigned BBID = Record[2];
    if (!BBID)
      // Invalid reference to entry block.
      return error("Invalid ID");
    if (!Fn->empty()) {
      Function::iterator BBI = Fn->begin(), BBE = Fn->end();
      for (size_t I = 0, E = BBID; I != E; ++I) {
        if (BBI == BBE)
          return error("Invalid ID");
        ++BBI;
      }
      BB = &*BBI;
    } else {
      // Otherwise insert a placeholder and remember it so it can be inserted
      // when the function is parsed.
      auto &FwdBBs = BasicBlockFwdRefs[Fn];
      if (FwdBBs.empty())
        BasicBlockFwdRefQueue.push_back(Fn);
      if (FwdBBs.size() < BBID + 1)
        FwdBBs.resize(BBID + 1);
      if (!FwdBBs[BBID])
        FwdBBs[BBID] = BasicBlock::Create(Context);
      BB = FwdBBs[BBID];
    }
    V = BlockAddress::get(Fn, BB);
    break;
  }
  }

  ValueList.assignValue(V, NextCstNo);
  ++NextCstNo;
}
2609}

2611Error BitcodeReader::parseUseLists() {
if (Stream.EnterSubBlock(bitc::USELIST_BLOCK_ID))
  return error("Invalid record");

// Read all the records.
SmallVector<uint64_t, 64> Record;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a use list record.
  Record.clear();
  bool IsBB = false;
  switch (Stream.readRecord(Entry.ID, Record)) {
  default:  // Default behavior: unknown type.
    break;
  case bitc::USELIST_CODE_BB:
    IsBB = true;
    LLVM_FALLTHROUGH[[clang::fallthrough]];
  case bitc::USELIST_CODE_DEFAULT: {
    unsigned RecordLength = Record.size();
    if (RecordLength < 3)
      // Records should have at least an ID and two indexes.
      return error("Invalid record");
    unsigned ID = Record.back();
    Record.pop_back();

    Value *V;
    if (IsBB) {
      assert(ID < FunctionBBs.size() && "Basic block not found")((ID < FunctionBBs.size() && "Basic block not found"
) ? static_cast<void> (0) : __assert_fail ("ID < FunctionBBs.size() && \"Basic block not found\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2651, __PRETTY_FUNCTION__));
      V = FunctionBBs[ID];
    } else
      V = ValueList[ID];
    unsigned NumUses = 0;
    SmallDenseMap<const Use *, unsigned, 16> Order;
    for (const Use &U : V->materialized_uses()) {
      if (++NumUses > Record.size())
        break;
      Order[&U] = Record[NumUses - 1];
    }
    if (Order.size() != Record.size() || NumUses > Record.size())
      // Mismatches can happen if the functions are being materialized lazily
      // (out-of-order), or a value has been upgraded.
      break;

    V->sortUseList([&](const Use &L, const Use &R) {
      return Order.lookup(&L) < Order.lookup(&R);
    });
    break;
  }
  }
}
2674}

2676/// When we see the block for metadata, remember where it is and then skip it.
2677/// This lets us lazily deserialize the metadata.
2678Error BitcodeReader::rememberAndSkipMetadata() {
// Save the current stream state.
uint64_t CurBit = Stream.GetCurrentBitNo();
DeferredMetadataInfo.push_back(CurBit);

// Skip over the block for now.
if (Stream.SkipBlock())
  return error("Invalid record");
return Error::success();
2687}

2689Error BitcodeReader::materializeMetadata() {
for (uint64_t BitPos : DeferredMetadataInfo) {
  // Move the bit stream to the saved position.
  Stream.JumpToBit(BitPos);
  if (Error Err = MDLoader->parseModuleMetadata())
    return Err;
}

// Upgrade "Linker Options" module flag to "llvm.linker.options" module-level
// metadata.
if (Metadata *Val = TheModule->getModuleFlag("Linker Options")) {
  NamedMDNode *LinkerOpts =
      TheModule->getOrInsertNamedMetadata("llvm.linker.options");
  for (const MDOperand &MDOptions : cast<MDNode>(Val)->operands())
    LinkerOpts->addOperand(cast<MDNode>(MDOptions));
}

DeferredMetadataInfo.clear();
return Error::success();
2708}

2710void BitcodeReader::setStripDebugInfo() { StripDebugInfo = true; }

2712/// When we see the block for a function body, remember where it is and then
2713/// skip it.  This lets us lazily deserialize the functions.
2714Error BitcodeReader::rememberAndSkipFunctionBody() {
// Get the function we are talking about.
if (FunctionsWithBodies.empty())
  return error("Insufficient function protos");

Function *Fn = FunctionsWithBodies.back();
FunctionsWithBodies.pop_back();

// Save the current stream state.
uint64_t CurBit = Stream.GetCurrentBitNo();
assert((((DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] ==
 CurBit) && "Mismatch between VST and scanned function offsets"
) ? static_cast<void> (0) : __assert_fail ("(DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] == CurBit) && \"Mismatch between VST and scanned function offsets\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2726, __PRETTY_FUNCTION__))
    (DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] == CurBit) &&(((DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] ==
 CurBit) && "Mismatch between VST and scanned function offsets"
) ? static_cast<void> (0) : __assert_fail ("(DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] == CurBit) && \"Mismatch between VST and scanned function offsets\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2726, __PRETTY_FUNCTION__))
    "Mismatch between VST and scanned function offsets")(((DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] ==
 CurBit) && "Mismatch between VST and scanned function offsets"
) ? static_cast<void> (0) : __assert_fail ("(DeferredFunctionInfo[Fn] == 0 || DeferredFunctionInfo[Fn] == CurBit) && \"Mismatch between VST and scanned function offsets\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2726, __PRETTY_FUNCTION__));
DeferredFunctionInfo[Fn] = CurBit;

// Skip over the function block for now.
if (Stream.SkipBlock())
  return error("Invalid record");
return Error::success();
2733}

2735Error BitcodeReader::globalCleanup() {
// Patch the initializers for globals and aliases up.
if (Error Err = resolveGlobalAndIndirectSymbolInits())
  return Err;
if (!GlobalInits.empty() || !IndirectSymbolInits.empty())
  return error("Malformed global initializer set");

// Look for intrinsic functions which need to be upgraded at some point
for (Function &F : *TheModule) {
  MDLoader->upgradeDebugIntrinsics(F);
  Function *NewFn;
  if (UpgradeIntrinsicFunction(&F, NewFn))
    UpgradedIntrinsics[&F] = NewFn;
  else if (auto Remangled = Intrinsic::remangleIntrinsicFunction(&F))
    // Some types could be renamed during loading if several modules are
    // loaded in the same LLVMContext (LTO scenario). In this case we should
    // remangle intrinsics names as well.
    RemangledIntrinsics[&F] = Remangled.getValue();
}

// Look for global variables which need to be renamed.
for (GlobalVariable &GV : TheModule->globals())
  UpgradeGlobalVariable(&GV);

// Force deallocation of memory for these vectors to favor the client that
// want lazy deserialization.
std::vector<std::pair<GlobalVariable *, unsigned>>().swap(GlobalInits);
std::vector<std::pair<GlobalIndirectSymbol *, unsigned>>().swap(
    IndirectSymbolInits);
return Error::success();
2765}

2767/// Support for lazy parsing of function bodies. This is required if we
2768/// either have an old bitcode file without a VST forward declaration record,
2769/// or if we have an anonymous function being materialized, since anonymous
2770/// functions do not have a name and are therefore not in the VST.
2771Error BitcodeReader::rememberAndSkipFunctionBodies() {
Stream.JumpToBit(NextUnreadBit);

if (Stream.AtEndOfStream())
  return error("Could not find function in stream");

if (!SeenFirstFunctionBody)
  return error("Trying to materialize functions before seeing function blocks");

// An old bitcode file with the symbol table at the end would have
// finished the parse greedily.
assert(SeenValueSymbolTable)((SeenValueSymbolTable) ? static_cast<void> (0) : __assert_fail
 ("SeenValueSymbolTable", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2782, __PRETTY_FUNCTION__));

SmallVector<uint64_t, 64> Record;

while (true) {
  BitstreamEntry Entry = Stream.advance();
  switch (Entry.Kind) {
  default:
    return error("Expect SubBlock");
  case BitstreamEntry::SubBlock:
    switch (Entry.ID) {
    default:
      return error("Expect function block");
    case bitc::FUNCTION_BLOCK_ID:
      if (Error Err = rememberAndSkipFunctionBody())
        return Err;
      NextUnreadBit = Stream.GetCurrentBitNo();
      return Error::success();
    }
  }
}
2803}

2805bool BitcodeReaderBase::readBlockInfo() {
Optional<BitstreamBlockInfo> NewBlockInfo = Stream.ReadBlockInfoBlock();
if (!NewBlockInfo)
  return true;
BlockInfo = std::move(*NewBlockInfo);
return false;
2811}

2813Error BitcodeReader::parseComdatRecord(ArrayRef<uint64_t> Record) {
// v1: [selection_kind, name]
// v2: [strtab_offset, strtab_size, selection_kind]
StringRef Name;
std::tie(Name, Record) = readNameFromStrtab(Record);

if (Record.empty())
  return error("Invalid record");
Comdat::SelectionKind SK = getDecodedComdatSelectionKind(Record[0]);
std::string OldFormatName;
if (!UseStrtab) {
  if (Record.size() < 2)
    return error("Invalid record");
  unsigned ComdatNameSize = Record[1];
  OldFormatName.reserve(ComdatNameSize);
  for (unsigned i = 0; i != ComdatNameSize; ++i)
    OldFormatName += (char)Record[2 + i];
  Name = OldFormatName;
}
Comdat *C = TheModule->getOrInsertComdat(Name);
C->setSelectionKind(SK);
ComdatList.push_back(C);
return Error::success();
2836}

2838static void inferDSOLocal(GlobalValue *GV) {
// infer dso_local from linkage and visibility if it is not encoded.
if (GV->hasLocalLinkage() ||
    (!GV->hasDefaultVisibility() && !GV->hasExternalWeakLinkage()))
  GV->setDSOLocal(true);
2843}

2845Error BitcodeReader::parseGlobalVarRecord(ArrayRef<uint64_t> Record) {
// v1: [pointer type, isconst, initid, linkage, alignment, section,
// visibility, threadlocal, unnamed_addr, externally_initialized,
// dllstorageclass, comdat, attributes, preemption specifier] (name in VST)
// v2: [strtab_offset, strtab_size, v1]
StringRef Name;
std::tie(Name, Record) = readNameFromStrtab(Record);

if (Record.size() < 6)
  return error("Invalid record");
Type *Ty = getTypeByID(Record[0]);
if (!Ty)
  return error("Invalid record");
bool isConstant = Record[1] & 1;
bool explicitType = Record[1] & 2;
unsigned AddressSpace;
if (explicitType) {
  AddressSpace = Record[1] >> 2;
} else {
  if (!Ty->isPointerTy())
    return error("Invalid type for value");
  AddressSpace = cast<PointerType>(Ty)->getAddressSpace();
  Ty = cast<PointerType>(Ty)->getElementType();
}

uint64_t RawLinkage = Record[3];
GlobalValue::LinkageTypes Linkage = getDecodedLinkage(RawLinkage);
unsigned Alignment;
if (Error Err = parseAlignmentValue(Record[4], Alignment))
  return Err;
std::string Section;
if (Record[5]) {
  if (Record[5] - 1 >= SectionTable.size())
    return error("Invalid ID");
  Section = SectionTable[Record[5] - 1];
}
GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
// Local linkage must have default visibility.
if (Record.size() > 6 && !GlobalValue::isLocalLinkage(Linkage))
  // FIXME: Change to an error if non-default in 4.0.
  Visibility = getDecodedVisibility(Record[6]);

GlobalVariable::ThreadLocalMode TLM = GlobalVariable::NotThreadLocal;
if (Record.size() > 7)
  TLM = getDecodedThreadLocalMode(Record[7]);

GlobalValue::UnnamedAddr UnnamedAddr = GlobalValue::UnnamedAddr::None;
if (Record.size() > 8)
  UnnamedAddr = getDecodedUnnamedAddrType(Record[8]);

bool ExternallyInitialized = false;
if (Record.size() > 9)
  ExternallyInitialized = Record[9];

GlobalVariable *NewGV =
    new GlobalVariable(*TheModule, Ty, isConstant, Linkage, nullptr, Name,
                       nullptr, TLM, AddressSpace, ExternallyInitialized);
NewGV->setAlignment(Alignment);
if (!Section.empty())
  NewGV->setSection(Section);
NewGV->setVisibility(Visibility);
NewGV->setUnnamedAddr(UnnamedAddr);

if (Record.size() > 10)
  NewGV->setDLLStorageClass(getDecodedDLLStorageClass(Record[10]));
else
  upgradeDLLImportExportLinkage(NewGV, RawLinkage);

ValueList.push_back(NewGV);

// Remember which value to use for the global initializer.
if (unsigned InitID = Record[2])
  GlobalInits.push_back(std::make_pair(NewGV, InitID - 1));

if (Record.size() > 11) {
  if (unsigned ComdatID = Record[11]) {
    if (ComdatID > ComdatList.size())
      return error("Invalid global variable comdat ID");
    NewGV->setComdat(ComdatList[ComdatID - 1]);
  }
} else if (hasImplicitComdat(RawLinkage)) {
  NewGV->setComdat(reinterpret_cast<Comdat *>(1));
}

if (Record.size() > 12) {
  auto AS = getAttributes(Record[12]).getFnAttributes();
  NewGV->setAttributes(AS);
}

if (Record.size() > 13) {
  NewGV->setDSOLocal(getDecodedDSOLocal(Record[13]));
}
inferDSOLocal(NewGV);

return Error::success();
2940}

2942Error BitcodeReader::parseFunctionRecord(ArrayRef<uint64_t> Record) {
// v1: [type, callingconv, isproto, linkage, paramattr, alignment, section,
// visibility, gc, unnamed_addr, prologuedata, dllstorageclass, comdat,
// prefixdata,  personalityfn, preemption specifier, addrspace] (name in VST)
// v2: [strtab_offset, strtab_size, v1]
StringRef Name;
std::tie(Name, Record) = readNameFromStrtab(Record);

if (Record.size() < 8)
  return error("Invalid record");
Type *Ty = getTypeByID(Record[0]);
if (!Ty)
  return error("Invalid record");
if (auto *PTy = dyn_cast<PointerType>(Ty))
  Ty = PTy->getElementType();
auto *FTy = dyn_cast<FunctionType>(Ty);
if (!FTy)
  return error("Invalid type for value");
auto CC = static_cast<CallingConv::ID>(Record[1]);
if (CC & ~CallingConv::MaxID)
  return error("Invalid calling convention ID");

unsigned AddrSpace = TheModule->getDataLayout().getProgramAddressSpace();
if (Record.size() > 16)
  AddrSpace = Record[16];

Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage,
                                  AddrSpace, Name, TheModule);

Func->setCallingConv(CC);
bool isProto = Record[2];
uint64_t RawLinkage = Record[3];
Func->setLinkage(getDecodedLinkage(RawLinkage));
Func->setAttributes(getAttributes(Record[4]));

unsigned Alignment;
if (Error Err = parseAlignmentValue(Record[5], Alignment))
  return Err;
Func->setAlignment(Alignment);
if (Record[6]) {
  if (Record[6] - 1 >= SectionTable.size())
    return error("Invalid ID");
  Func->setSection(SectionTable[Record[6] - 1]);
}
// Local linkage must have default visibility.
if (!Func->hasLocalLinkage())
  // FIXME: Change to an error if non-default in 4.0.
  Func->setVisibility(getDecodedVisibility(Record[7]));
if (Record.size() > 8 && Record[8]) {
  if (Record[8] - 1 >= GCTable.size())
    return error("Invalid ID");
  Func->setGC(GCTable[Record[8] - 1]);
}
GlobalValue::UnnamedAddr UnnamedAddr = GlobalValue::UnnamedAddr::None;
if (Record.size() > 9)
  UnnamedAddr = getDecodedUnnamedAddrType(Record[9]);
Func->setUnnamedAddr(UnnamedAddr);
if (Record.size() > 10 && Record[10] != 0)
  FunctionPrologues.push_back(std::make_pair(Func, Record[10] - 1));

if (Record.size() > 11)
  Func->setDLLStorageClass(getDecodedDLLStorageClass(Record[11]));
else
  upgradeDLLImportExportLinkage(Func, RawLinkage);

if (Record.size() > 12) {
  if (unsigned ComdatID = Record[12]) {
    if (ComdatID > ComdatList.size())
      return error("Invalid function comdat ID");
    Func->setComdat(ComdatList[ComdatID - 1]);
  }
} else if (hasImplicitComdat(RawLinkage)) {
  Func->setComdat(reinterpret_cast<Comdat *>(1));
}

if (Record.size() > 13 && Record[13] != 0)
  FunctionPrefixes.push_back(std::make_pair(Func, Record[13] - 1));

if (Record.size() > 14 && Record[14] != 0)
  FunctionPersonalityFns.push_back(std::make_pair(Func, Record[14] - 1));

if (Record.size() > 15) {
  Func->setDSOLocal(getDecodedDSOLocal(Record[15]));
}
inferDSOLocal(Func);

ValueList.push_back(Func);

// If this is a function with a body, remember the prototype we are
// creating now, so that we can match up the body with them later.
if (!isProto) {
  Func->setIsMaterializable(true);
  FunctionsWithBodies.push_back(Func);
  DeferredFunctionInfo[Func] = 0;
}
return Error::success();
3038}

3040Error BitcodeReader::parseGlobalIndirectSymbolRecord(
  unsigned BitCode, ArrayRef<uint64_t> Record) {
// v1 ALIAS_OLD: [alias type, aliasee val#, linkage] (name in VST)
// v1 ALIAS: [alias type, addrspace, aliasee val#, linkage, visibility,
// dllstorageclass, threadlocal, unnamed_addr,
// preemption specifier] (name in VST)
// v1 IFUNC: [alias type, addrspace, aliasee val#, linkage,
// visibility, dllstorageclass, threadlocal, unnamed_addr,
// preemption specifier] (name in VST)
// v2: [strtab_offset, strtab_size, v1]
StringRef Name;
std::tie(Name, Record) = readNameFromStrtab(Record);

bool NewRecord = BitCode != bitc::MODULE_CODE_ALIAS_OLD;
if (Record.size() < (3 + (unsigned)NewRecord))
  return error("Invalid record");
unsigned OpNum = 0;
Type *Ty = getTypeByID(Record[OpNum++]);
if (!Ty)
  return error("Invalid record");

unsigned AddrSpace;
if (!NewRecord) {
  auto *PTy = dyn_cast<PointerType>(Ty);
  if (!PTy)
    return error("Invalid type for value");
  Ty = PTy->getElementType();
  AddrSpace = PTy->getAddressSpace();
} else {
  AddrSpace = Record[OpNum++];
}

auto Val = Record[OpNum++];
auto Linkage = Record[OpNum++];
GlobalIndirectSymbol *NewGA;
if (BitCode == bitc::MODULE_CODE_ALIAS ||
    BitCode == bitc::MODULE_CODE_ALIAS_OLD)
  NewGA = GlobalAlias::create(Ty, AddrSpace, getDecodedLinkage(Linkage), Name,
                              TheModule);
else
  NewGA = GlobalIFunc::create(Ty, AddrSpace, getDecodedLinkage(Linkage), Name,
                              nullptr, TheModule);
// Old bitcode files didn't have visibility field.
// Local linkage must have default visibility.
if (OpNum != Record.size()) {
  auto VisInd = OpNum++;
  if (!NewGA->hasLocalLinkage())
    // FIXME: Change to an error if non-default in 4.0.
    NewGA->setVisibility(getDecodedVisibility(Record[VisInd]));
}
if (BitCode == bitc::MODULE_CODE_ALIAS ||
    BitCode == bitc::MODULE_CODE_ALIAS_OLD) {
  if (OpNum != Record.size())
    NewGA->setDLLStorageClass(getDecodedDLLStorageClass(Record[OpNum++]));
  else
    upgradeDLLImportExportLinkage(NewGA, Linkage);
  if (OpNum != Record.size())
    NewGA->setThreadLocalMode(getDecodedThreadLocalMode(Record[OpNum++]));
  if (OpNum != Record.size())
    NewGA->setUnnamedAddr(getDecodedUnnamedAddrType(Record[OpNum++]));
}
if (OpNum != Record.size())
  NewGA->setDSOLocal(getDecodedDSOLocal(Record[OpNum++]));
inferDSOLocal(NewGA);

ValueList.push_back(NewGA);
IndirectSymbolInits.push_back(std::make_pair(NewGA, Val));
return Error::success();
3108}

3110Error BitcodeReader::parseModule(uint64_t ResumeBit,
                               bool ShouldLazyLoadMetadata) {
if (ResumeBit)
  Stream.JumpToBit(ResumeBit);
else if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

// Read all the records for this module.
while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return globalCleanup();

  case BitstreamEntry::SubBlock:
    switch (Entry.ID) {
    default:  // Skip unknown content.
      if (Stream.SkipBlock())
        return error("Invalid record");
      break;
    case bitc::BLOCKINFO_BLOCK_ID:
      if (readBlockInfo())
        return error("Malformed block");
      break;
    case bitc::PARAMATTR_BLOCK_ID:
      if (Error Err = parseAttributeBlock())
        return Err;
      break;
    case bitc::PARAMATTR_GROUP_BLOCK_ID:
      if (Error Err = parseAttributeGroupBlock())
        return Err;
      break;
    case bitc::TYPE_BLOCK_ID_NEW:
      if (Error Err = parseTypeTable())
        return Err;
      break;
    case bitc::VALUE_SYMTAB_BLOCK_ID:
      if (!SeenValueSymbolTable) {
        // Either this is an old form VST without function index and an
        // associated VST forward declaration record (which would have caused
        // the VST to be jumped to and parsed before it was encountered
        // normally in the stream), or there were no function blocks to
        // trigger an earlier parsing of the VST.
        assert(VSTOffset == 0 || FunctionsWithBodies.empty())((VSTOffset == 0 || FunctionsWithBodies.empty()) ? static_cast
<void> (0) : __assert_fail ("VSTOffset == 0 || FunctionsWithBodies.empty()"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3158, __PRETTY_FUNCTION__));
        if (Error Err = parseValueSymbolTable())
          return Err;
        SeenValueSymbolTable = true;
      } else {
        // We must have had a VST forward declaration record, which caused
        // the parser to jump to and parse the VST earlier.
        assert(VSTOffset > 0)((VSTOffset > 0) ? static_cast<void> (0) : __assert_fail
 ("VSTOffset > 0", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3165, __PRETTY_FUNCTION__));
        if (Stream.SkipBlock())
          return error("Invalid record");
      }
      break;
    case bitc::CONSTANTS_BLOCK_ID:
      if (Error Err = parseConstants())
        return Err;
      if (Error Err = resolveGlobalAndIndirectSymbolInits())
        return Err;
      break;
    case bitc::METADATA_BLOCK_ID:
      if (ShouldLazyLoadMetadata) {
        if (Error Err = rememberAndSkipMetadata())
          return Err;
        break;
      }
      assert(DeferredMetadataInfo.empty() && "Unexpected deferred metadata")((DeferredMetadataInfo.empty() && "Unexpected deferred metadata"
) ? static_cast<void> (0) : __assert_fail ("DeferredMetadataInfo.empty() && \"Unexpected deferred metadata\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3182, __PRETTY_FUNCTION__));
      if (Error Err = MDLoader->parseModuleMetadata())
        return Err;
      break;
    case bitc::METADATA_KIND_BLOCK_ID:
      if (Error Err = MDLoader->parseMetadataKinds())
        return Err;
      break;
    case bitc::FUNCTION_BLOCK_ID:
      // If this is the first function body we've seen, reverse the
      // FunctionsWithBodies list.
      if (!SeenFirstFunctionBody) {
        std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end());
        if (Error Err = globalCleanup())
          return Err;
        SeenFirstFunctionBody = true;
      }

      if (VSTOffset > 0) {
        // If we have a VST forward declaration record, make sure we
        // parse the VST now if we haven't already. It is needed to
        // set up the DeferredFunctionInfo vector for lazy reading.
        if (!SeenValueSymbolTable) {
          if (Error Err = BitcodeReader::parseValueSymbolTable(VSTOffset))
            return Err;
          SeenValueSymbolTable = true;
          // Fall through so that we record the NextUnreadBit below.
          // This is necessary in case we have an anonymous function that
          // is later materialized. Since it will not have a VST entry we
          // need to fall back to the lazy parse to find its offset.
        } else {
          // If we have a VST forward declaration record, but have already
          // parsed the VST (just above, when the first function body was
          // encountered here), then we are resuming the parse after
          // materializing functions. The ResumeBit points to the
          // start of the last function block recorded in the
          // DeferredFunctionInfo map. Skip it.
          if (Stream.SkipBlock())
            return error("Invalid record");
          continue;
        }
      }

      // Support older bitcode files that did not have the function
      // index in the VST, nor a VST forward declaration record, as
      // well as anonymous functions that do not have VST entries.
      // Build the DeferredFunctionInfo vector on the fly.
      if (Error Err = rememberAndSkipFunctionBody())
        return Err;

      // Suspend parsing when we reach the function bodies. Subsequent
      // materialization calls will resume it when necessary. If the bitcode
      // file is old, the symbol table will be at the end instead and will not
      // have been seen yet. In this case, just finish the parse now.
      if (SeenValueSymbolTable) {
        NextUnreadBit = Stream.GetCurrentBitNo();
        // After the VST has been parsed, we need to make sure intrinsic name
        // are auto-upgraded.
        return globalCleanup();
      }
      break;
    case bitc::USELIST_BLOCK_ID:
      if (Error Err = parseUseLists())
        return Err;
      break;
    case bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID:
      if (Error Err = parseOperandBundleTags())
        return Err;
      break;
    case bitc::SYNC_SCOPE_NAMES_BLOCK_ID:
      if (Error Err = parseSyncScopeNames())
        return Err;
      break;
    }
    continue;

  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  auto BitCode = Stream.readRecord(Entry.ID, Record);
  switch (BitCode) {
  default: break;  // Default behavior, ignore unknown content.
  case bitc::MODULE_CODE_VERSION: {
    Expected<unsigned> VersionOrErr = parseVersionRecord(Record);
    if (!VersionOrErr)
      return VersionOrErr.takeError();
    UseRelativeIDs = *VersionOrErr >= 1;
    break;
  }
  case bitc::MODULE_CODE_TRIPLE: {  // TRIPLE: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    TheModule->setTargetTriple(S);
    break;
  }
  case bitc::MODULE_CODE_DATALAYOUT: {  // DATALAYOUT: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    TheModule->setDataLayout(S);
    break;
  }
  case bitc::MODULE_CODE_ASM: {  // ASM: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    TheModule->setModuleInlineAsm(S);
    break;
  }
  case bitc::MODULE_CODE_DEPLIB: {  // DEPLIB: [strchr x N]
    // FIXME: Remove in 4.0.
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    // Ignore value.
    break;
  }
  case bitc::MODULE_CODE_SECTIONNAME: {  // SECTIONNAME: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    SectionTable.push_back(S);
    break;
  }
  case bitc::MODULE_CODE_GCNAME: {  // SECTIONNAME: [strchr x N]
    std::string S;
    if (convertToString(Record, 0, S))
      return error("Invalid record");
    GCTable.push_back(S);
    break;
  }
  case bitc::MODULE_CODE_COMDAT:
    if (Error Err = parseComdatRecord(Record))
      return Err;
    break;
  case bitc::MODULE_CODE_GLOBALVAR:
    if (Error Err = parseGlobalVarRecord(Record))
      return Err;
    break;
  case bitc::MODULE_CODE_FUNCTION:
    if (Error Err = parseFunctionRecord(Record))
      return Err;
    break;
  case bitc::MODULE_CODE_IFUNC:
  case bitc::MODULE_CODE_ALIAS:
  case bitc::MODULE_CODE_ALIAS_OLD:
    if (Error Err = parseGlobalIndirectSymbolRecord(BitCode, Record))
      return Err;
    break;
  /// MODULE_CODE_VSTOFFSET: [offset]
  case bitc::MODULE_CODE_VSTOFFSET:
    if (Record.size() < 1)
      return error("Invalid record");
    // Note that we subtract 1 here because the offset is relative to one word
    // before the start of the identification or module block, which was
    // historically always the start of the regular bitcode header.
    VSTOffset = Record[0] - 1;
    break;
  /// MODULE_CODE_SOURCE_FILENAME: [namechar x N]
  case bitc::MODULE_CODE_SOURCE_FILENAME:
    SmallString<128> ValueName;
    if (convertToString(Record, 0, ValueName))
      return error("Invalid record");
    TheModule->setSourceFileName(ValueName);
    break;
  }
  Record.clear();
}
3354}

3356Error BitcodeReader::parseBitcodeInto(Module *M, bool ShouldLazyLoadMetadata,
                                    bool IsImporting) {
TheModule = M;
MDLoader = MetadataLoader(Stream, *M, ValueList, IsImporting,
                          [&](unsigned ID) { return getTypeByID(ID); });
return parseModule(0, ShouldLazyLoadMetadata);
3362}

3364Error BitcodeReader::typeCheckLoadStoreInst(Type *ValType, Type *PtrType) {
if (!isa<PointerType>(PtrType))
  return error("Load/Store operand is not a pointer type");
Type *ElemType = cast<PointerType>(PtrType)->getElementType();

if (ValType && ValType != ElemType)
  return error("Explicit load/store type does not match pointee "
               "type of pointer operand");
if (!PointerType::isLoadableOrStorableType(ElemType))
  return error("Cannot load/store from pointer");
return Error::success();
3375}

3377/// Lazily parse the specified function body block.
3378Error BitcodeReader::parseFunctionBody(Function *F) {
if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID))
1
Assuming the condition is false→
2
←
Taking false branch→
  return error("Invalid record");

// Unexpected unresolved metadata when parsing function.
if (MDLoader->hasFwdRefs())
3
←
Assuming the condition is false→
4
←
Taking false branch→
  return error("Invalid function metadata: incoming forward references");

InstructionList.clear();
unsigned ModuleValueListSize = ValueList.size();
unsigned ModuleMDLoaderSize = MDLoader->size();

// Add all the function arguments to the value table.
for (Argument &I : F->args())
5
←
Assuming '__begin1' is equal to '__end1'→
  ValueList.push_back(&I);

unsigned NextValueNo = ValueList.size();
BasicBlock *CurBB = nullptr;
6
←
'CurBB' initialized to a null pointer value→
unsigned CurBBNo = 0;

DebugLoc LastLoc;
auto getLastInstruction = [&]() -> Instruction * {
  if (CurBB && !CurBB->empty())
    return &CurBB->back();
  else if (CurBBNo && FunctionBBs[CurBBNo - 1] &&
           !FunctionBBs[CurBBNo - 1]->empty())
    return &FunctionBBs[CurBBNo - 1]->back();
  return nullptr;
};

std::vector<OperandBundleDef> OperandBundles;

// Read all the records.
SmallVector<uint64_t, 64> Record;

while (true) {
7
←
Loop condition is true.  Entering loop body→
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
8
←
Control jumps to 'case Record:'  at line 3454→
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    goto OutOfRecordLoop;

  case BitstreamEntry::SubBlock:
    switch (Entry.ID) {
    default:  // Skip unknown content.
      if (Stream.SkipBlock())
        return error("Invalid record");
      break;
    case bitc::CONSTANTS_BLOCK_ID:
      if (Error Err = parseConstants())
        return Err;
      NextValueNo = ValueList.size();
      break;
    case bitc::VALUE_SYMTAB_BLOCK_ID:
      if (Error Err = parseValueSymbolTable())
        return Err;
      break;
    case bitc::METADATA_ATTACHMENT_ID:
      if (Error Err = MDLoader->parseMetadataAttachment(*F, InstructionList))
        return Err;
      break;
    case bitc::METADATA_BLOCK_ID:
      assert(DeferredMetadataInfo.empty() &&((DeferredMetadataInfo.empty() && "Must read all module-level metadata before function-level"
) ? static_cast<void> (0) : __assert_fail ("DeferredMetadataInfo.empty() && \"Must read all module-level metadata before function-level\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3443, __PRETTY_FUNCTION__))
             "Must read all module-level metadata before function-level")((DeferredMetadataInfo.empty() && "Must read all module-level metadata before function-level"
) ? static_cast<void> (0) : __assert_fail ("DeferredMetadataInfo.empty() && \"Must read all module-level metadata before function-level\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3443, __PRETTY_FUNCTION__));
      if (Error Err = MDLoader->parseFunctionMetadata())
        return Err;
      break;
    case bitc::USELIST_BLOCK_ID:
      if (Error Err = parseUseLists())
        return Err;
      break;
    }
    continue;

  case BitstreamEntry::Record:
    // The interesting case.
    break;
9
←
 Execution continues on line 3460→
  }

  // Read a record.
  Record.clear();
  Instruction *I = nullptr;
  unsigned BitCode = Stream.readRecord(Entry.ID, Record);
  switch (BitCode) {
10
←
Control jumps to 'case FUNC_CODE_INST_CMPXCHG_OLD:'  at line 4410→
  default: // Default behavior: reject
    return error("Invalid value");
  case bitc::FUNC_CODE_DECLAREBLOCKS: {   // DECLAREBLOCKS: [nblocks]
    if (Record.size() < 1 || Record[0] == 0)
      return error("Invalid record");
    // Create all the basic blocks for the function.
    FunctionBBs.resize(Record[0]);

    // See if anything took the address of blocks in this function.
    auto BBFRI = BasicBlockFwdRefs.find(F);
    if (BBFRI == BasicBlockFwdRefs.end()) {
      for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i)
        FunctionBBs[i] = BasicBlock::Create(Context, "", F);
    } else {
      auto &BBRefs = BBFRI->second;
      // Check for invalid basic block references.
      if (BBRefs.size() > FunctionBBs.size())
        return error("Invalid ID");
      assert(!BBRefs.empty() && "Unexpected empty array")((!BBRefs.empty() && "Unexpected empty array") ? static_cast
<void> (0) : __assert_fail ("!BBRefs.empty() && \"Unexpected empty array\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3482, __PRETTY_FUNCTION__));
      assert(!BBRefs.front() && "Invalid reference to entry block")((!BBRefs.front() && "Invalid reference to entry block"
) ? static_cast<void> (0) : __assert_fail ("!BBRefs.front() && \"Invalid reference to entry block\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3483, __PRETTY_FUNCTION__));
      for (unsigned I = 0, E = FunctionBBs.size(), RE = BBRefs.size(); I != E;
           ++I)
        if (I < RE && BBRefs[I]) {
          BBRefs[I]->insertInto(F);
          FunctionBBs[I] = BBRefs[I];
        } else {
          FunctionBBs[I] = BasicBlock::Create(Context, "", F);
        }

      // Erase from the table.
      BasicBlockFwdRefs.erase(BBFRI);
    }

    CurBB = FunctionBBs[0];
    continue;
  }

  case bitc::FUNC_CODE_DEBUG_LOC_AGAIN:  // DEBUG_LOC_AGAIN
    // This record indicates that the last instruction is at the same
    // location as the previous instruction with a location.
    I = getLastInstruction();

    if (!I)
      return error("Invalid record");
    I->setDebugLoc(LastLoc);
    I = nullptr;
    continue;

  case bitc::FUNC_CODE_DEBUG_LOC: {      // DEBUG_LOC: [line, col, scope, ia]
    I = getLastInstruction();
    if (!I || Record.size() < 4)
      return error("Invalid record");

    unsigned Line = Record[0], Col = Record[1];
    unsigned ScopeID = Record[2], IAID = Record[3];
    bool isImplicitCode = Record.size() == 5 && Record[4];

    MDNode *Scope = nullptr, *IA = nullptr;
    if (ScopeID) {
      Scope = MDLoader->getMDNodeFwdRefOrNull(ScopeID - 1);
      if (!Scope)
        return error("Invalid record");
    }
    if (IAID) {
      IA = MDLoader->getMDNodeFwdRefOrNull(IAID - 1);
      if (!IA)
        return error("Invalid record");
    }
    LastLoc = DebugLoc::get(Line, Col, Scope, IA, isImplicitCode);
    I->setDebugLoc(LastLoc);
    I = nullptr;
    continue;
  }

  case bitc::FUNC_CODE_INST_BINOP: {    // BINOP: [opval, ty, opval, opcode]
    unsigned OpNum = 0;
    Value *LHS, *RHS;
    if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
        popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS) ||
        OpNum+1 > Record.size())
      return error("Invalid record");

    int Opc = getDecodedBinaryOpcode(Record[OpNum++], LHS->getType());
    if (Opc == -1)
      return error("Invalid record");
    I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS);
    InstructionList.push_back(I);
    if (OpNum < Record.size()) {
      if (Opc == Instruction::Add ||
          Opc == Instruction::Sub ||
          Opc == Instruction::Mul ||
          Opc == Instruction::Shl) {
        if (Record[OpNum] & (1 << bitc::OBO_NO_SIGNED_WRAP))
          cast<BinaryOperator>(I)->setHasNoSignedWrap(true);
        if (Record[OpNum] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
          cast<BinaryOperator>(I)->setHasNoUnsignedWrap(true);
      } else if (Opc == Instruction::SDiv ||
                 Opc == Instruction::UDiv ||
                 Opc == Instruction::LShr ||
                 Opc == Instruction::AShr) {
        if (Record[OpNum] & (1 << bitc::PEO_EXACT))
          cast<BinaryOperator>(I)->setIsExact(true);
      } else if (isa<FPMathOperator>(I)) {
        FastMathFlags FMF = getDecodedFastMathFlags(Record[OpNum]);
        if (FMF.any())
          I->setFastMathFlags(FMF);
      }

    }
    break;
  }
  case bitc::FUNC_CODE_INST_CAST: {    // CAST: [opval, opty, destty, castopc]
    unsigned OpNum = 0;
    Value *Op;
    if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
        OpNum+2 != Record.size())
      return error("Invalid record");

    Type *ResTy = getTypeByID(Record[OpNum]);
    int Opc = getDecodedCastOpcode(Record[OpNum + 1]);
    if (Opc == -1 || !ResTy)
      return error("Invalid record");
    Instruction *Temp = nullptr;
    if ((I = UpgradeBitCastInst(Opc, Op, ResTy, Temp))) {
      if (Temp) {
        InstructionList.push_back(Temp);
        CurBB->getInstList().push_back(Temp);
      }
    } else {
      auto CastOp = (Instruction::CastOps)Opc;
      if (!CastInst::castIsValid(CastOp, Op, ResTy))
        return error("Invalid cast");
      I = CastInst::Create(CastOp, Op, ResTy);
    }
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_INBOUNDS_GEP_OLD:
  case bitc::FUNC_CODE_INST_GEP_OLD:
  case bitc::FUNC_CODE_INST_GEP: { // GEP: type, [n x operands]
    unsigned OpNum = 0;

    Type *Ty;
    bool InBounds;

    if (BitCode == bitc::FUNC_CODE_INST_GEP) {
      InBounds = Record[OpNum++];
      Ty = getTypeByID(Record[OpNum++]);
    } else {
      InBounds = BitCode == bitc::FUNC_CODE_INST_INBOUNDS_GEP_OLD;
      Ty = nullptr;
    }

    Value *BasePtr;
    if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr))
      return error("Invalid record");

    if (!Ty)
      Ty = cast<PointerType>(BasePtr->getType()->getScalarType())
               ->getElementType();
    else if (Ty !=
             cast<PointerType>(BasePtr->getType()->getScalarType())
                 ->getElementType())
      return error(
          "Explicit gep type does not match pointee type of pointer operand");

    SmallVector<Value*, 16> GEPIdx;
    while (OpNum != Record.size()) {
      Value *Op;
      if (getValueTypePair(Record, OpNum, NextValueNo, Op))
        return error("Invalid record");
      GEPIdx.push_back(Op);
    }

    I = GetElementPtrInst::Create(Ty, BasePtr, GEPIdx);

    InstructionList.push_back(I);
    if (InBounds)
      cast<GetElementPtrInst>(I)->setIsInBounds(true);
    break;
  }

  case bitc::FUNC_CODE_INST_EXTRACTVAL: {
                                     // EXTRACTVAL: [opty, opval, n x indices]
    unsigned OpNum = 0;
    Value *Agg;
    if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
      return error("Invalid record");

    unsigned RecSize = Record.size();
    if (OpNum == RecSize)
      return error("EXTRACTVAL: Invalid instruction with 0 indices");

    SmallVector<unsigned, 4> EXTRACTVALIdx;
    Type *CurTy = Agg->getType();
    for (; OpNum != RecSize; ++OpNum) {
      bool IsArray = CurTy->isArrayTy();
      bool IsStruct = CurTy->isStructTy();
      uint64_t Index = Record[OpNum];

      if (!IsStruct && !IsArray)
        return error("EXTRACTVAL: Invalid type");
      if ((unsigned)Index != Index)
        return error("Invalid value");
      if (IsStruct && Index >= CurTy->subtypes().size())
        return error("EXTRACTVAL: Invalid struct index");
      if (IsArray && Index >= CurTy->getArrayNumElements())
        return error("EXTRACTVAL: Invalid array index");
      EXTRACTVALIdx.push_back((unsigned)Index);

      if (IsStruct)
        CurTy = CurTy->subtypes()[Index];
      else
        CurTy = CurTy->subtypes()[0];
    }

    I = ExtractValueInst::Create(Agg, EXTRACTVALIdx);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_INSERTVAL: {
                         // INSERTVAL: [opty, opval, opty, opval, n x indices]
    unsigned OpNum = 0;
    Value *Agg;
    if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
      return error("Invalid record");
    Value *Val;
    if (getValueTypePair(Record, OpNum, NextValueNo, Val))
      return error("Invalid record");

    unsigned RecSize = Record.size();
    if (OpNum == RecSize)
      return error("INSERTVAL: Invalid instruction with 0 indices");

    SmallVector<unsigned, 4> INSERTVALIdx;
    Type *CurTy = Agg->getType();
    for (; OpNum != RecSize; ++OpNum) {
      bool IsArray = CurTy->isArrayTy();
      bool IsStruct = CurTy->isStructTy();
      uint64_t Index = Record[OpNum];

      if (!IsStruct && !IsArray)
        return error("INSERTVAL: Invalid type");
      if ((unsigned)Index != Index)
        return error("Invalid value");
      if (IsStruct && Index >= CurTy->subtypes().size())
        return error("INSERTVAL: Invalid struct index");
      if (IsArray && Index >= CurTy->getArrayNumElements())
        return error("INSERTVAL: Invalid array index");

      INSERTVALIdx.push_back((unsigned)Index);
      if (IsStruct)
        CurTy = CurTy->subtypes()[Index];
      else
        CurTy = CurTy->subtypes()[0];
    }

    if (CurTy != Val->getType())
      return error("Inserted value type doesn't match aggregate type");

    I = InsertValueInst::Create(Agg, Val, INSERTVALIdx);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
    // obsolete form of select
    // handles select i1 ... in old bitcode
    unsigned OpNum = 0;
    Value *TrueVal, *FalseVal, *Cond;
    if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
        popValue(Record, OpNum, NextValueNo, TrueVal->getType(), FalseVal) ||
        popValue(Record, OpNum, NextValueNo, Type::getInt1Ty(Context), Cond))
      return error("Invalid record");

    I = SelectInst::Create(Cond, TrueVal, FalseVal);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred]
    // new form of select
    // handles select i1 or select [N x i1]
    unsigned OpNum = 0;
    Value *TrueVal, *FalseVal, *Cond;
    if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
        popValue(Record, OpNum, NextValueNo, TrueVal->getType(), FalseVal) ||
        getValueTypePair(Record, OpNum, NextValueNo, Cond))
      return error("Invalid record");

    // select condition can be either i1 or [N x i1]
    if (VectorType* vector_type =
        dyn_cast<VectorType>(Cond->getType())) {
      // expect <n x i1>
      if (vector_type->getElementType() != Type::getInt1Ty(Context))
        return error("Invalid type for value");
    } else {
      // expect i1
      if (Cond->getType() != Type::getInt1Ty(Context))
        return error("Invalid type for value");
    }

    I = SelectInst::Create(Cond, TrueVal, FalseVal);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
    unsigned OpNum = 0;
    Value *Vec, *Idx;
    if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
        getValueTypePair(Record, OpNum, NextValueNo, Idx))
      return error("Invalid record");
    if (!Vec->getType()->isVectorTy())
      return error("Invalid type for value");
    I = ExtractElementInst::Create(Vec, Idx);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval]
    unsigned OpNum = 0;
    Value *Vec, *Elt, *Idx;
    if (getValueTypePair(Record, OpNum, NextValueNo, Vec))
      return error("Invalid record");
    if (!Vec->getType()->isVectorTy())
      return error("Invalid type for value");
    if (popValue(Record, OpNum, NextValueNo,
                 cast<VectorType>(Vec->getType())->getElementType(), Elt) ||
        getValueTypePair(Record, OpNum, NextValueNo, Idx))
      return error("Invalid record");
    I = InsertElementInst::Create(Vec, Elt, Idx);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval]
    unsigned OpNum = 0;
    Value *Vec1, *Vec2, *Mask;
    if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) ||
        popValue(Record, OpNum, NextValueNo, Vec1->getType(), Vec2))
      return error("Invalid record");

    if (getValueTypePair(Record, OpNum, NextValueNo, Mask))
      return error("Invalid record");
    if (!Vec1->getType()->isVectorTy() || !Vec2->getType()->isVectorTy())
      return error("Invalid type for value");
    I = new ShuffleVectorInst(Vec1, Vec2, Mask);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_CMP:   // CMP: [opty, opval, opval, pred]
    // Old form of ICmp/FCmp returning bool
    // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were
    // both legal on vectors but had different behaviour.
  case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred]
    // FCmp/ICmp returning bool or vector of bool

    unsigned OpNum = 0;
    Value *LHS, *RHS;
    if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
        popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS))
      return error("Invalid record");

    unsigned PredVal = Record[OpNum];
    bool IsFP = LHS->getType()->isFPOrFPVectorTy();
    FastMathFlags FMF;
    if (IsFP && Record.size() > OpNum+1)
      FMF = getDecodedFastMathFlags(Record[++OpNum]);

    if (OpNum+1 != Record.size())
      return error("Invalid record");

    if (LHS->getType()->isFPOrFPVectorTy())
      I = new FCmpInst((FCmpInst::Predicate)PredVal, LHS, RHS);
    else
      I = new ICmpInst((ICmpInst::Predicate)PredVal, LHS, RHS);

    if (FMF.any())
      I->setFastMathFlags(FMF);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
    {
      unsigned Size = Record.size();
      if (Size == 0) {
        I = ReturnInst::Create(Context);
        InstructionList.push_back(I);
        break;
      }

      unsigned OpNum = 0;
      Value *Op = nullptr;
      if (getValueTypePair(Record, OpNum, NextValueNo, Op))
        return error("Invalid record");
      if (OpNum != Record.size())
        return error("Invalid record");

      I = ReturnInst::Create(Context, Op);
      InstructionList.push_back(I);
      break;
    }
  case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
    if (Record.size() != 1 && Record.size() != 3)
      return error("Invalid record");
    BasicBlock *TrueDest = getBasicBlock(Record[0]);
    if (!TrueDest)
      return error("Invalid record");

    if (Record.size() == 1) {
      I = BranchInst::Create(TrueDest);
      InstructionList.push_back(I);
    }
    else {
      BasicBlock *FalseDest = getBasicBlock(Record[1]);
      Value *Cond = getValue(Record, 2, NextValueNo,
                             Type::getInt1Ty(Context));
      if (!FalseDest || !Cond)
        return error("Invalid record");
      I = BranchInst::Create(TrueDest, FalseDest, Cond);
      InstructionList.push_back(I);
    }
    break;
  }
  case bitc::FUNC_CODE_INST_CLEANUPRET: { // CLEANUPRET: [val] or [val,bb#]
    if (Record.size() != 1 && Record.size() != 2)
      return error("Invalid record");
    unsigned Idx = 0;
    Value *CleanupPad =
        getValue(Record, Idx++, NextValueNo, Type::getTokenTy(Context));
    if (!CleanupPad)
      return error("Invalid record");
    BasicBlock *UnwindDest = nullptr;
    if (Record.size() == 2) {
      UnwindDest = getBasicBlock(Record[Idx++]);
      if (!UnwindDest)
        return error("Invalid record");
    }

    I = CleanupReturnInst::Create(CleanupPad, UnwindDest);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_CATCHRET: { // CATCHRET: [val,bb#]
    if (Record.size() != 2)
      return error("Invalid record");
    unsigned Idx = 0;
    Value *CatchPad =
        getValue(Record, Idx++, NextValueNo, Type::getTokenTy(Context));
    if (!CatchPad)
      return error("Invalid record");
    BasicBlock *BB = getBasicBlock(Record[Idx++]);
    if (!BB)
      return error("Invalid record");

    I = CatchReturnInst::Create(CatchPad, BB);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_CATCHSWITCH: { // CATCHSWITCH: [tok,num,(bb)*,bb?]
    // We must have, at minimum, the outer scope and the number of arguments.
    if (Record.size() < 2)
      return error("Invalid record");

    unsigned Idx = 0;

    Value *ParentPad =
        getValue(Record, Idx++, NextValueNo, Type::getTokenTy(Context));

    unsigned NumHandlers = Record[Idx++];

    SmallVector<BasicBlock *, 2> Handlers;
    for (unsigned Op = 0; Op != NumHandlers; ++Op) {
      BasicBlock *BB = getBasicBlock(Record[Idx++]);
      if (!BB)
        return error("Invalid record");
      Handlers.push_back(BB);
    }

    BasicBlock *UnwindDest = nullptr;
    if (Idx + 1 == Record.size()) {
      UnwindDest = getBasicBlock(Record[Idx++]);
      if (!UnwindDest)
        return error("Invalid record");
    }

    if (Record.size() != Idx)
      return error("Invalid record");

    auto *CatchSwitch =
        CatchSwitchInst::Create(ParentPad, UnwindDest, NumHandlers);
    for (BasicBlock *Handler : Handlers)
      CatchSwitch->addHandler(Handler);
    I = CatchSwitch;
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_CATCHPAD:
  case bitc::FUNC_CODE_INST_CLEANUPPAD: { // [tok,num,(ty,val)*]
    // We must have, at minimum, the outer scope and the number of arguments.
    if (Record.size() < 2)
      return error("Invalid record");

    unsigned Idx = 0;

    Value *ParentPad =
        getValue(Record, Idx++, NextValueNo, Type::getTokenTy(Context));

    unsigned NumArgOperands = Record[Idx++];

    SmallVector<Value *, 2> Args;
    for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
      Value *Val;
      if (getValueTypePair(Record, Idx, NextValueNo, Val))
        return error("Invalid record");
      Args.push_back(Val);
    }

    if (Record.size() != Idx)
      return error("Invalid record");

    if (BitCode == bitc::FUNC_CODE_INST_CLEANUPPAD)
      I = CleanupPadInst::Create(ParentPad, Args);
    else
      I = CatchPadInst::Create(ParentPad, Args);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, op0, op1, ...]
    // Check magic
    if ((Record[0] >> 16) == SWITCH_INST_MAGIC) {
      // "New" SwitchInst format with case ranges. The changes to write this
      // format were reverted but we still recognize bitcode that uses it.
      // Hopefully someday we will have support for case ranges and can use
      // this format again.

      Type *OpTy = getTypeByID(Record[1]);
      unsigned ValueBitWidth = cast<IntegerType>(OpTy)->getBitWidth();

      Value *Cond = getValue(Record, 2, NextValueNo, OpTy);
      BasicBlock *Default = getBasicBlock(Record[3]);
      if (!OpTy || !Cond || !Default)
        return error("Invalid record");

      unsigned NumCases = Record[4];

      SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases);
      InstructionList.push_back(SI);

      unsigned CurIdx = 5;
      for (unsigned i = 0; i != NumCases; ++i) {
        SmallVector<ConstantInt*, 1> CaseVals;
        unsigned NumItems = Record[CurIdx++];
        for (unsigned ci = 0; ci != NumItems; ++ci) {
          bool isSingleNumber = Record[CurIdx++];

          APInt Low;
          unsigned ActiveWords = 1;
          if (ValueBitWidth > 64)
            ActiveWords = Record[CurIdx++];
          Low = readWideAPInt(makeArrayRef(&Record[CurIdx], ActiveWords),
                              ValueBitWidth);
          CurIdx += ActiveWords;

          if (!isSingleNumber) {
            ActiveWords = 1;
            if (ValueBitWidth > 64)
              ActiveWords = Record[CurIdx++];
            APInt High = readWideAPInt(
                makeArrayRef(&Record[CurIdx], ActiveWords), ValueBitWidth);
            CurIdx += ActiveWords;

            // FIXME: It is not clear whether values in the range should be
            // compared as signed or unsigned values. The partially
            // implemented changes that used this format in the past used
            // unsigned comparisons.
            for ( ; Low.ule(High); ++Low)
              CaseVals.push_back(ConstantInt::get(Context, Low));
          } else
            CaseVals.push_back(ConstantInt::get(Context, Low));
        }
        BasicBlock *DestBB = getBasicBlock(Record[CurIdx++]);
        for (SmallVector<ConstantInt*, 1>::iterator cvi = CaseVals.begin(),
               cve = CaseVals.end(); cvi != cve; ++cvi)
          SI->addCase(*cvi, DestBB);
      }
      I = SI;
      break;
    }

    // Old SwitchInst format without case ranges.

    if (Record.size() < 3 || (Record.size() & 1) == 0)
      return error("Invalid record");
    Type *OpTy = getTypeByID(Record[0]);
    Value *Cond = getValue(Record, 1, NextValueNo, OpTy);
    BasicBlock *Default = getBasicBlock(Record[2]);
    if (!OpTy || !Cond || !Default)
      return error("Invalid record");
    unsigned NumCases = (Record.size()-3)/2;
    SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases);
    InstructionList.push_back(SI);
    for (unsigned i = 0, e = NumCases; i != e; ++i) {
      ConstantInt *CaseVal =
        dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy));
      BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]);
      if (!CaseVal || !DestBB) {
        delete SI;
        return error("Invalid record");
      }
      SI->addCase(CaseVal, DestBB);
    }
    I = SI;
    break;
  }
  case bitc::FUNC_CODE_INST_INDIRECTBR: { // INDIRECTBR: [opty, op0, op1, ...]
    if (Record.size() < 2)
      return error("Invalid record");
    Type *OpTy = getTypeByID(Record[0]);
    Value *Address = getValue(Record, 1, NextValueNo, OpTy);
    if (!OpTy || !Address)
      return error("Invalid record");
    unsigned NumDests = Record.size()-2;
    IndirectBrInst *IBI = IndirectBrInst::Create(Address, NumDests);
    InstructionList.push_back(IBI);
    for (unsigned i = 0, e = NumDests; i != e; ++i) {
      if (BasicBlock *DestBB = getBasicBlock(Record[2+i])) {
        IBI->addDestination(DestBB);
      } else {
        delete IBI;
        return error("Invalid record");
      }
    }
    I = IBI;
    break;
  }

  case bitc::FUNC_CODE_INST_INVOKE: {
    // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...]
    if (Record.size() < 4)
      return error("Invalid record");
    unsigned OpNum = 0;
    AttributeList PAL = getAttributes(Record[OpNum++]);
    unsigned CCInfo = Record[OpNum++];
    BasicBlock *NormalBB = getBasicBlock(Record[OpNum++]);
    BasicBlock *UnwindBB = getBasicBlock(Record[OpNum++]);

    FunctionType *FTy = nullptr;
    if (CCInfo >> 13 & 1 &&
        !(FTy = dyn_cast<FunctionType>(getTypeByID(Record[OpNum++]))))
      return error("Explicit invoke type is not a function type");

    Value *Callee;
    if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
      return error("Invalid record");

    PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
    if (!CalleeTy)
      return error("Callee is not a pointer");
    if (!FTy) {
      FTy = dyn_cast<FunctionType>(CalleeTy->getElementType());
      if (!FTy)
        return error("Callee is not of pointer to function type");
    } else if (CalleeTy->getElementType() != FTy)
      return error("Explicit invoke type does not match pointee type of "
                   "callee operand");
    if (Record.size() < FTy->getNumParams() + OpNum)
      return error("Insufficient operands to call");

    SmallVector<Value*, 16> Ops;
    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
      Ops.push_back(getValue(Record, OpNum, NextValueNo,
                             FTy->getParamType(i)));
      if (!Ops.back())
        return error("Invalid record");
    }

    if (!FTy->isVarArg()) {
      if (Record.size() != OpNum)
        return error("Invalid record");
    } else {
      // Read type/value pairs for varargs params.
      while (OpNum != Record.size()) {
        Value *Op;
        if (getValueTypePair(Record, OpNum, NextValueNo, Op))
          return error("Invalid record");
        Ops.push_back(Op);
      }
    }

    I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops, OperandBundles);
    OperandBundles.clear();
    InstructionList.push_back(I);
    cast<InvokeInst>(I)->setCallingConv(
        static_cast<CallingConv::ID>(CallingConv::MaxID & CCInfo));
    cast<InvokeInst>(I)->setAttributes(PAL);
    break;
  }
  case bitc::FUNC_CODE_INST_RESUME: { // RESUME: [opval]
    unsigned Idx = 0;
    Value *Val = nullptr;
    if (getValueTypePair(Record, Idx, NextValueNo, Val))
      return error("Invalid record");
    I = ResumeInst::Create(Val);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE
    I = new UnreachableInst(Context);
    InstructionList.push_back(I);
    break;
  case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...]
    if (Record.size() < 1 || ((Record.size()-1)&1))
      return error("Invalid record");
    Type *Ty = getTypeByID(Record[0]);
    if (!Ty)
      return error("Invalid record");

    PHINode *PN = PHINode::Create(Ty, (Record.size()-1)/2);
    InstructionList.push_back(PN);

    for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) {
      Value *V;
      // With the new function encoding, it is possible that operands have
      // negative IDs (for forward references).  Use a signed VBR
      // representation to keep the encoding small.
      if (UseRelativeIDs)
        V = getValueSigned(Record, 1+i, NextValueNo, Ty);
      else
        V = getValue(Record, 1+i, NextValueNo, Ty);
      BasicBlock *BB = getBasicBlock(Record[2+i]);
      if (!V || !BB)
        return error("Invalid record");
      PN->addIncoming(V, BB);
    }
    I = PN;
    break;
  }

  case bitc::FUNC_CODE_INST_LANDINGPAD:
  case bitc::FUNC_CODE_INST_LANDINGPAD_OLD: {
    // LANDINGPAD: [ty, val, val, num, (id0,val0 ...)?]
    unsigned Idx = 0;
    if (BitCode == bitc::FUNC_CODE_INST_LANDINGPAD) {
      if (Record.size() < 3)
        return error("Invalid record");
    } else {
      assert(BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD)((BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD) ? static_cast
<void> (0) : __assert_fail ("BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4215, __PRETTY_FUNCTION__));
      if (Record.size() < 4)
        return error("Invalid record");
    }
    Type *Ty = getTypeByID(Record[Idx++]);
    if (!Ty)
      return error("Invalid record");
    if (BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD) {
      Value *PersFn = nullptr;
      if (getValueTypePair(Record, Idx, NextValueNo, PersFn))
        return error("Invalid record");

      if (!F->hasPersonalityFn())
        F->setPersonalityFn(cast<Constant>(PersFn));
      else if (F->getPersonalityFn() != cast<Constant>(PersFn))
        return error("Personality function mismatch");
    }

    bool IsCleanup = !!Record[Idx++];
    unsigned NumClauses = Record[Idx++];
    LandingPadInst *LP = LandingPadInst::Create(Ty, NumClauses);
    LP->setCleanup(IsCleanup);
    for (unsigned J = 0; J != NumClauses; ++J) {
      LandingPadInst::ClauseType CT =
        LandingPadInst::ClauseType(Record[Idx++]); (void)CT;
      Value *Val;

      if (getValueTypePair(Record, Idx, NextValueNo, Val)) {
        delete LP;
        return error("Invalid record");
      }

      assert((CT != LandingPadInst::Catch ||(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4249, __PRETTY_FUNCTION__))
              !isa<ArrayType>(Val->getType())) &&(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4249, __PRETTY_FUNCTION__))
             "Catch clause has a invalid type!")(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4249, __PRETTY_FUNCTION__));
      assert((CT != LandingPadInst::Filter ||(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4252, __PRETTY_FUNCTION__))
              isa<ArrayType>(Val->getType())) &&(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4252, __PRETTY_FUNCTION__))
             "Filter clause has invalid type!")(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4252, __PRETTY_FUNCTION__));
      LP->addClause(cast<Constant>(Val));
    }

    I = LP;
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, opty, op, align]
    if (Record.size() != 4)
      return error("Invalid record");
    uint64_t AlignRecord = Record[3];
    const uint64_t InAllocaMask = uint64_t(1) << 5;
    const uint64_t ExplicitTypeMask = uint64_t(1) << 6;
    const uint64_t SwiftErrorMask = uint64_t(1) << 7;
    const uint64_t FlagMask = InAllocaMask | ExplicitTypeMask |
                              SwiftErrorMask;
    bool InAlloca = AlignRecord & InAllocaMask;
    bool SwiftError = AlignRecord & SwiftErrorMask;
    Type *Ty = getTypeByID(Record[0]);
    if ((AlignRecord & ExplicitTypeMask) == 0) {
      auto *PTy = dyn_cast_or_null<PointerType>(Ty);
      if (!PTy)
        return error("Old-style alloca with a non-pointer type");
      Ty = PTy->getElementType();
    }
    Type *OpTy = getTypeByID(Record[1]);
    Value *Size = getFnValueByID(Record[2], OpTy);
    unsigned Align;
    if (Error Err = parseAlignmentValue(AlignRecord & ~FlagMask, Align)) {
      return Err;
    }
    if (!Ty || !Size)
      return error("Invalid record");

    // FIXME: Make this an optional field.
    const DataLayout &DL = TheModule->getDataLayout();
    unsigned AS = DL.getAllocaAddrSpace();

    AllocaInst *AI = new AllocaInst(Ty, AS, Size, Align);
    AI->setUsedWithInAlloca(InAlloca);
    AI->setSwiftError(SwiftError);
    I = AI;
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol]
    unsigned OpNum = 0;
    Value *Op;
    if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
        (OpNum + 2 != Record.size() && OpNum + 3 != Record.size()))
      return error("Invalid record");

    Type *Ty = nullptr;
    if (OpNum + 3 == Record.size())
      Ty = getTypeByID(Record[OpNum++]);
    if (Error Err = typeCheckLoadStoreInst(Ty, Op->getType()))
      return Err;
    if (!Ty)
      Ty = cast<PointerType>(Op->getType())->getElementType();

    unsigned Align;
    if (Error Err = parseAlignmentValue(Record[OpNum], Align))
      return Err;
    I = new LoadInst(Ty, Op, "", Record[OpNum + 1], Align);

    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_LOADATOMIC: {
     // LOADATOMIC: [opty, op, align, vol, ordering, ssid]
    unsigned OpNum = 0;
    Value *Op;
    if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
        (OpNum + 4 != Record.size() && OpNum + 5 != Record.size()))
      return error("Invalid record");

    Type *Ty = nullptr;
    if (OpNum + 5 == Record.size())
      Ty = getTypeByID(Record[OpNum++]);
    if (Error Err = typeCheckLoadStoreInst(Ty, Op->getType()))
      return Err;
    if (!Ty)
      Ty = cast<PointerType>(Op->getType())->getElementType();

    AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
    if (Ordering == AtomicOrdering::NotAtomic ||
        Ordering == AtomicOrdering::Release ||
        Ordering == AtomicOrdering::AcquireRelease)
      return error("Invalid record");
    if (Ordering != AtomicOrdering::NotAtomic && Record[OpNum] == 0)
      return error("Invalid record");
    SyncScope::ID SSID = getDecodedSyncScopeID(Record[OpNum + 3]);

    unsigned Align;
    if (Error Err = parseAlignmentValue(Record[OpNum], Align))
      return Err;
    I = new LoadInst(Op, "", Record[OpNum+1], Align, Ordering, SSID);

    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_STORE:
  case bitc::FUNC_CODE_INST_STORE_OLD: { // STORE2:[ptrty, ptr, val, align, vol]
    unsigned OpNum = 0;
    Value *Val, *Ptr;
    if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
        (BitCode == bitc::FUNC_CODE_INST_STORE
             ? getValueTypePair(Record, OpNum, NextValueNo, Val)
             : popValue(Record, OpNum, NextValueNo,
                        cast<PointerType>(Ptr->getType())->getElementType(),
                        Val)) ||
        OpNum + 2 != Record.size())
      return error("Invalid record");

    if (Error Err = typeCheckLoadStoreInst(Val->getType(), Ptr->getType()))
      return Err;
    unsigned Align;
    if (Error Err = parseAlignmentValue(Record[OpNum], Align))
      return Err;
    I = new StoreInst(Val, Ptr, Record[OpNum+1], Align);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_STOREATOMIC:
  case bitc::FUNC_CODE_INST_STOREATOMIC_OLD: {
    // STOREATOMIC: [ptrty, ptr, val, align, vol, ordering, ssid]
    unsigned OpNum = 0;
    Value *Val, *Ptr;
    if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
        !isa<PointerType>(Ptr->getType()) ||
        (BitCode == bitc::FUNC_CODE_INST_STOREATOMIC
             ? getValueTypePair(Record, OpNum, NextValueNo, Val)
             : popValue(Record, OpNum, NextValueNo,
                        cast<PointerType>(Ptr->getType())->getElementType(),
                        Val)) ||
        OpNum + 4 != Record.size())
      return error("Invalid record");

    if (Error Err = typeCheckLoadStoreInst(Val->getType(), Ptr->getType()))
      return Err;
    AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
    if (Ordering == AtomicOrdering::NotAtomic ||
        Ordering == AtomicOrdering::Acquire ||
        Ordering == AtomicOrdering::AcquireRelease)
      return error("Invalid record");
    SyncScope::ID SSID = getDecodedSyncScopeID(Record[OpNum + 3]);
    if (Ordering != AtomicOrdering::NotAtomic && Record[OpNum] == 0)
      return error("Invalid record");

    unsigned Align;
    if (Error Err = parseAlignmentValue(Record[OpNum], Align))
      return Err;
    I = new StoreInst(Val, Ptr, Record[OpNum+1], Align, Ordering, SSID);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_CMPXCHG_OLD:
  case bitc::FUNC_CODE_INST_CMPXCHG: {
    // CMPXCHG:[ptrty, ptr, cmp, new, vol, successordering, ssid,
    //          failureordering?, isweak?]
    unsigned OpNum = 0;
    Value *Ptr, *Cmp, *New;
    if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
14
←
Taking false branch→
        (BitCode == bitc::FUNC_CODE_INST_CMPXCHG
11
←
'?' condition is false→
             ? getValueTypePair(Record, OpNum, NextValueNo, Cmp)
             : popValue(Record, OpNum, NextValueNo,
                        cast<PointerType>(Ptr->getType())->getElementType(),
                        Cmp)) ||
        popValue(Record, OpNum, NextValueNo, Cmp->getType(), New) ||
        Record.size() < OpNum + 3 || Record.size() > OpNum + 5)
12
←
Assuming the condition is false→
13
←
Assuming the condition is false→
      return error("Invalid record");
    AtomicOrdering SuccessOrdering = getDecodedOrdering(Record[OpNum + 1]);
    if (SuccessOrdering == AtomicOrdering::NotAtomic ||
15
←
Taking false branch→
        SuccessOrdering == AtomicOrdering::Unordered)
      return error("Invalid record");
    SyncScope::ID SSID = getDecodedSyncScopeID(Record[OpNum + 2]);

    if (Error Err = typeCheckLoadStoreInst(Cmp->getType(), Ptr->getType()))
16
←
Taking false branch→
      return Err;
    AtomicOrdering FailureOrdering;
    if (Record.size() < 7)
17
←
Assuming the condition is false→
18
←
Taking false branch→
      FailureOrdering =
          AtomicCmpXchgInst::getStrongestFailureOrdering(SuccessOrdering);
    else
      FailureOrdering = getDecodedOrdering(Record[OpNum + 3]);

    I = new AtomicCmpXchgInst(Ptr, Cmp, New, SuccessOrdering, FailureOrdering,
                              SSID);
    cast<AtomicCmpXchgInst>(I)->setVolatile(Record[OpNum]);

    if (Record.size() < 8) {
19
←
Assuming the condition is true→
20
←
Taking true branch→
      // Before weak cmpxchgs existed, the instruction simply returned the
      // value loaded from memory, so bitcode files from that era will be
      // expecting the first component of a modern cmpxchg.
      CurBB->getInstList().push_back(I);
21
←
Called C++ object pointer is null
      I = ExtractValueInst::Create(I, 0);
    } else {
      cast<AtomicCmpXchgInst>(I)->setWeak(Record[OpNum+4]);
    }

    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_ATOMICRMW: {
    // ATOMICRMW:[ptrty, ptr, val, op, vol, ordering, ssid]
    unsigned OpNum = 0;
    Value *Ptr, *Val;
    if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
        !isa<PointerType>(Ptr->getType()) ||
        popValue(Record, OpNum, NextValueNo,
                  cast<PointerType>(Ptr->getType())->getElementType(), Val) ||
        OpNum+4 != Record.size())
      return error("Invalid record");
    AtomicRMWInst::BinOp Operation = getDecodedRMWOperation(Record[OpNum]);
    if (Operation < AtomicRMWInst::FIRST_BINOP ||
        Operation > AtomicRMWInst::LAST_BINOP)
      return error("Invalid record");
    AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
    if (Ordering == AtomicOrdering::NotAtomic ||
        Ordering == AtomicOrdering::Unordered)
      return error("Invalid record");
    SyncScope::ID SSID = getDecodedSyncScopeID(Record[OpNum + 3]);
    I = new AtomicRMWInst(Operation, Ptr, Val, Ordering, SSID);
    cast<AtomicRMWInst>(I)->setVolatile(Record[OpNum+1]);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_FENCE: { // FENCE:[ordering, ssid]
    if (2 != Record.size())
      return error("Invalid record");
    AtomicOrdering Ordering = getDecodedOrdering(Record[0]);
    if (Ordering == AtomicOrdering::NotAtomic ||
        Ordering == AtomicOrdering::Unordered ||
        Ordering == AtomicOrdering::Monotonic)
      return error("Invalid record");
    SyncScope::ID SSID = getDecodedSyncScopeID(Record[1]);
    I = new FenceInst(Context, Ordering, SSID);
    InstructionList.push_back(I);
    break;
  }
  case bitc::FUNC_CODE_INST_CALL: {
    // CALL: [paramattrs, cc, fmf, fnty, fnid, arg0, arg1...]
    if (Record.size() < 3)
      return error("Invalid record");

    unsigned OpNum = 0;
    AttributeList PAL = getAttributes(Record[OpNum++]);
    unsigned CCInfo = Record[OpNum++];

    FastMathFlags FMF;
    if ((CCInfo >> bitc::CALL_FMF) & 1) {
      FMF = getDecodedFastMathFlags(Record[OpNum++]);
      if (!FMF.any())
        return error("Fast math flags indicator set for call with no FMF");
    }

    FunctionType *FTy = nullptr;
    if (CCInfo >> bitc::CALL_EXPLICIT_TYPE & 1 &&
        !(FTy = dyn_cast<FunctionType>(getTypeByID(Record[OpNum++]))))
      return error("Explicit call type is not a function type");

    Value *Callee;
    if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
      return error("Invalid record");

    PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
    if (!OpTy)
      return error("Callee is not a pointer type");
    if (!FTy) {
      FTy = dyn_cast<FunctionType>(OpTy->getElementType());
      if (!FTy)
        return error("Callee is not of pointer to function type");
    } else if (OpTy->getElementType() != FTy)
      return error("Explicit call type does not match pointee type of "
                   "callee operand");
    if (Record.size() < FTy->getNumParams() + OpNum)
      return error("Insufficient operands to call");

    SmallVector<Value*, 16> Args;
    // Read the fixed params.
    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
      if (FTy->getParamType(i)->isLabelTy())
        Args.push_back(getBasicBlock(Record[OpNum]));
      else
        Args.push_back(getValue(Record, OpNum, NextValueNo,
                                FTy->getParamType(i)));
      if (!Args.back())
        return error("Invalid record");
    }

    // Read type/value pairs for varargs params.
    if (!FTy->isVarArg()) {
      if (OpNum != Record.size())
        return error("Invalid record");
    } else {
      while (OpNum != Record.size()) {
        Value *Op;
        if (getValueTypePair(Record, OpNum, NextValueNo, Op))
          return error("Invalid record");
        Args.push_back(Op);
      }
    }

    I = CallInst::Create(FTy, Callee, Args, OperandBundles);
    OperandBundles.clear();
    InstructionList.push_back(I);
    cast<CallInst>(I)->setCallingConv(
        static_cast<CallingConv::ID>((0x7ff & CCInfo) >> bitc::CALL_CCONV));
    CallInst::TailCallKind TCK = CallInst::TCK_None;
    if (CCInfo & 1 << bitc::CALL_TAIL)
      TCK = CallInst::TCK_Tail;
    if (CCInfo & (1 << bitc::CALL_MUSTTAIL))
      TCK = CallInst::TCK_MustTail;
    if (CCInfo & (1 << bitc::CALL_NOTAIL))
      TCK = CallInst::TCK_NoTail;
    cast<CallInst>(I)->setTailCallKind(TCK);
    cast<CallInst>(I)->setAttributes(PAL);
    if (FMF.any()) {
      if (!isa<FPMathOperator>(I))
        return error("Fast-math-flags specified for call without "
                     "floating-point scalar or vector return type");
      I->setFastMathFlags(FMF);
    }
    break;
  }
  case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
    if (Record.size() < 3)
      return error("Invalid record");
    Type *OpTy = getTypeByID(Record[0]);
    Value *Op = getValue(Record, 1, NextValueNo, OpTy);
    Type *ResTy = getTypeByID(Record[2]);
    if (!OpTy || !Op || !ResTy)
      return error("Invalid record");
    I = new VAArgInst(Op, ResTy);
    InstructionList.push_back(I);
    break;
  }

  case bitc::FUNC_CODE_OPERAND_BUNDLE: {
    // A call or an invoke can be optionally prefixed with some variable
    // number of operand bundle blocks.  These blocks are read into
    // OperandBundles and consumed at the next call or invoke instruction.

    if (Record.size() < 1 || Record[0] >= BundleTags.size())
      return error("Invalid record");

    std::vector<Value *> Inputs;

    unsigned OpNum = 1;
    while (OpNum != Record.size()) {
      Value *Op;
      if (getValueTypePair(Record, OpNum, NextValueNo, Op))
        return error("Invalid record");
      Inputs.push_back(Op);
    }

    OperandBundles.emplace_back(BundleTags[Record[0]], std::move(Inputs));
    continue;
  }
  }

  // Add instruction to end of current BB.  If there is no current BB, reject
  // this file.
  if (!CurBB) {
    I->deleteValue();
    return error("Invalid instruction with no BB");
  }
  if (!OperandBundles.empty()) {
    I->deleteValue();
    return error("Operand bundles found with no consumer");
  }
  CurBB->getInstList().push_back(I);

  // If this was a terminator instruction, move to the next block.
  if (I->isTerminator()) {
    ++CurBBNo;
    CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : nullptr;
  }

  // Non-void values get registered in the value table for future use.
  if (I && !I->getType()->isVoidTy())
    ValueList.assignValue(I, NextValueNo++);
}

4638OutOfRecordLoop:

if (!OperandBundles.empty())
  return error("Operand bundles found with no consumer");

// Check the function list for unresolved values.
if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
  if (!A->getParent()) {
    // We found at least one unresolved value.  Nuke them all to avoid leaks.
    for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
      if ((A = dyn_cast_or_null<Argument>(ValueList[i])) && !A->getParent()) {
        A->replaceAllUsesWith(UndefValue::get(A->getType()));
        delete A;
      }
    }
    return error("Never resolved value found in function");
  }
}

// Unexpected unresolved metadata about to be dropped.
if (MDLoader->hasFwdRefs())
  return error("Invalid function metadata: outgoing forward refs");

// Trim the value list down to the size it was before we parsed this function.
ValueList.shrinkTo(ModuleValueListSize);
MDLoader->shrinkTo(ModuleMDLoaderSize);
std::vector<BasicBlock*>().swap(FunctionBBs);
return Error::success();
4666}

4668/// Find the function body in the bitcode stream
4669Error BitcodeReader::findFunctionInStream(
  Function *F,
  DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator) {
while (DeferredFunctionInfoIterator->second == 0) {
  // This is the fallback handling for the old format bitcode that
  // didn't contain the function index in the VST, or when we have
  // an anonymous function which would not have a VST entry.
  // Assert that we have one of those two cases.
  assert(VSTOffset == 0 || !F->hasName())((VSTOffset == 0 || !F->hasName()) ? static_cast<void>
 (0) : __assert_fail ("VSTOffset == 0 || !F->hasName()", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4677, __PRETTY_FUNCTION__));
  // Parse the next body in the stream and set its position in the
  // DeferredFunctionInfo map.
  if (Error Err = rememberAndSkipFunctionBodies())
    return Err;
}
return Error::success();
4684}

4686SyncScope::ID BitcodeReader::getDecodedSyncScopeID(unsigned Val) {
if (Val == SyncScope::SingleThread || Val == SyncScope::System)
  return SyncScope::ID(Val);
if (Val >= SSIDs.size())
  return SyncScope::System; // Map unknown synchronization scopes to system.
return SSIDs[Val];
4692}

4694//===----------------------------------------------------------------------===//
4695// GVMaterializer implementation
4696//===----------------------------------------------------------------------===//

4698Error BitcodeReader::materialize(GlobalValue *GV) {
Function *F = dyn_cast<Function>(GV);
// If it's not a function or is already material, ignore the request.
if (!F || !F->isMaterializable())
  return Error::success();

DenseMap<Function*, uint64_t>::iterator DFII = DeferredFunctionInfo.find(F);
assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!")((DFII != DeferredFunctionInfo.end() && "Deferred function not found!"
) ? static_cast<void> (0) : __assert_fail ("DFII != DeferredFunctionInfo.end() && \"Deferred function not found!\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4705, __PRETTY_FUNCTION__));
// If its position is recorded as 0, its body is somewhere in the stream
// but we haven't seen it yet.
if (DFII->second == 0)
  if (Error Err = findFunctionInStream(F, DFII))
    return Err;

// Materialize metadata before parsing any function bodies.
if (Error Err = materializeMetadata())
  return Err;

// Move the bit stream to the saved position of the deferred function body.
Stream.JumpToBit(DFII->second);

if (Error Err = parseFunctionBody(F))
  return Err;
F->setIsMaterializable(false);

if (StripDebugInfo)
  stripDebugInfo(*F);

// Upgrade any old intrinsic calls in the function.
for (auto &I : UpgradedIntrinsics) {
  for (auto UI = I.first->materialized_user_begin(), UE = I.first->user_end();
       UI != UE;) {
    User *U = *UI;
    ++UI;
    if (CallInst *CI = dyn_cast<CallInst>(U))
      UpgradeIntrinsicCall(CI, I.second);
  }
}

// Update calls to the remangled intrinsics
for (auto &I : RemangledIntrinsics)
  for (auto UI = I.first->materialized_user_begin(), UE = I.first->user_end();
       UI != UE;)
    // Don't expect any other users than call sites
    CallSite(*UI++).setCalledFunction(I.second);

// Finish fn->subprogram upgrade for materialized functions.
if (DISubprogram *SP = MDLoader->lookupSubprogramForFunction(F))
  F->setSubprogram(SP);

// Check if the TBAA Metadata are valid, otherwise we will need to strip them.
if (!MDLoader->isStrippingTBAA()) {
  for (auto &I : instructions(F)) {
    MDNode *TBAA = I.getMetadata(LLVMContext::MD_tbaa);
    if (!TBAA || TBAAVerifyHelper.visitTBAAMetadata(I, TBAA))
      continue;
    MDLoader->setStripTBAA(true);
    stripTBAA(F->getParent());
  }
}

// Bring in any functions that this function forward-referenced via
// blockaddresses.
return materializeForwardReferencedFunctions();
4762}

4764Error BitcodeReader::materializeModule() {
if (Error Err = materializeMetadata())
  return Err;

// Promise to materialize all forward references.
WillMaterializeAllForwardRefs = true;

// Iterate over the module, deserializing any functions that are still on
// disk.
for (Function &F : *TheModule) {
  if (Error Err = materialize(&F))
    return Err;
}
// At this point, if there are any function bodies, parse the rest of
// the bits in the module past the last function block we have recorded
// through either lazy scanning or the VST.
if (LastFunctionBlockBit || NextUnreadBit)
  if (Error Err = parseModule(LastFunctionBlockBit > NextUnreadBit
                                  ? LastFunctionBlockBit
                                  : NextUnreadBit))
    return Err;

// Check that all block address forward references got resolved (as we
// promised above).
if (!BasicBlockFwdRefs.empty())
  return error("Never resolved function from blockaddress");

// Upgrade any intrinsic calls that slipped through (should not happen!) and
// delete the old functions to clean up. We can't do this unless the entire
// module is materialized because there could always be another function body
// with calls to the old function.
for (auto &I : UpgradedIntrinsics) {
  for (auto *U : I.first->users()) {
    if (CallInst *CI = dyn_cast<CallInst>(U))
      UpgradeIntrinsicCall(CI, I.second);
  }
  if (!I.first->use_empty())
    I.first->replaceAllUsesWith(I.second);
  I.first->eraseFromParent();
}
UpgradedIntrinsics.clear();
// Do the same for remangled intrinsics
for (auto &I : RemangledIntrinsics) {
  I.first->replaceAllUsesWith(I.second);
  I.first->eraseFromParent();
}
RemangledIntrinsics.clear();

UpgradeDebugInfo(*TheModule);

UpgradeModuleFlags(*TheModule);

UpgradeRetainReleaseMarker(*TheModule);

return Error::success();
4819}

4821std::vector<StructType *> BitcodeReader::getIdentifiedStructTypes() const {
return IdentifiedStructTypes;
4823}

4825ModuleSummaryIndexBitcodeReader::ModuleSummaryIndexBitcodeReader(
  BitstreamCursor Cursor, StringRef Strtab, ModuleSummaryIndex &TheIndex,
  StringRef ModulePath, unsigned ModuleId)
  : BitcodeReaderBase(std::move(Cursor), Strtab), TheIndex(TheIndex),
    ModulePath(ModulePath), ModuleId(ModuleId) {}

4831void ModuleSummaryIndexBitcodeReader::addThisModule() {
TheIndex.addModule(ModulePath, ModuleId);
4833}

4835ModuleSummaryIndex::ModuleInfo *
4836ModuleSummaryIndexBitcodeReader::getThisModule() {
return TheIndex.getModule(ModulePath);
4838}

4840std::pair<ValueInfo, GlobalValue::GUID>
4841ModuleSummaryIndexBitcodeReader::getValueInfoFromValueId(unsigned ValueId) {
auto VGI = ValueIdToValueInfoMap[ValueId];
assert(VGI.first)((VGI.first) ? static_cast<void> (0) : __assert_fail ("VGI.first"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4843, __PRETTY_FUNCTION__));
return VGI;
4845}

4847void ModuleSummaryIndexBitcodeReader::setValueGUID(
  uint64_t ValueID, StringRef ValueName, GlobalValue::LinkageTypes Linkage,
  StringRef SourceFileName) {
std::string GlobalId =
    GlobalValue::getGlobalIdentifier(ValueName, Linkage, SourceFileName);
auto ValueGUID = GlobalValue::getGUID(GlobalId);
auto OriginalNameID = ValueGUID;
if (GlobalValue::isLocalLinkage(Linkage))
  OriginalNameID = GlobalValue::getGUID(ValueName);
if (PrintSummaryGUIDs)
  dbgs() << "GUID " << ValueGUID << "(" << OriginalNameID << ") is "
         << ValueName << "\n";

// UseStrtab is false for legacy summary formats and value names are
// created on stack. In that case we save the name in a string saver in
// the index so that the value name can be recorded.
ValueIdToValueInfoMap[ValueID] = std::make_pair(
    TheIndex.getOrInsertValueInfo(
        ValueGUID,
        UseStrtab ? ValueName : TheIndex.saveString(ValueName.str())),
    OriginalNameID);
4868}

4870// Specialized value symbol table parser used when reading module index
4871// blocks where we don't actually create global values. The parsed information
4872// is saved in the bitcode reader for use when later parsing summaries.
4873Error ModuleSummaryIndexBitcodeReader::parseValueSymbolTable(
  uint64_t Offset,
  DenseMap<unsigned, GlobalValue::LinkageTypes> &ValueIdToLinkageMap) {
// With a strtab the VST is not required to parse the summary.
if (UseStrtab)
  return Error::success();

assert(Offset > 0 && "Expected non-zero VST offset")((Offset > 0 && "Expected non-zero VST offset") ? static_cast
<void> (0) : __assert_fail ("Offset > 0 && \"Expected non-zero VST offset\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4880, __PRETTY_FUNCTION__));
uint64_t CurrentBit = jumpToValueSymbolTable(Offset, Stream);

if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

// Read all the records for this value table.
SmallString<128> ValueName;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    // Done parsing VST, jump back to wherever we came from.
    Stream.JumpToBit(CurrentBit);
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record.
  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  default: // Default behavior: ignore (e.g. VST_CODE_BBENTRY records).
    break;
  case bitc::VST_CODE_ENTRY: { // VST_CODE_ENTRY: [valueid, namechar x N]
    if (convertToString(Record, 1, ValueName))
      return error("Invalid record");
    unsigned ValueID = Record[0];
    assert(!SourceFileName.empty())((!SourceFileName.empty()) ? static_cast<void> (0) : __assert_fail
 ("!SourceFileName.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4916, __PRETTY_FUNCTION__));
    auto VLI = ValueIdToLinkageMap.find(ValueID);
    assert(VLI != ValueIdToLinkageMap.end() &&((VLI != ValueIdToLinkageMap.end() && "No linkage found for VST entry?"
) ? static_cast<void> (0) : __assert_fail ("VLI != ValueIdToLinkageMap.end() && \"No linkage found for VST entry?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4919, __PRETTY_FUNCTION__))
           "No linkage found for VST entry?")((VLI != ValueIdToLinkageMap.end() && "No linkage found for VST entry?"
) ? static_cast<void> (0) : __assert_fail ("VLI != ValueIdToLinkageMap.end() && \"No linkage found for VST entry?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4919, __PRETTY_FUNCTION__));
    auto Linkage = VLI->second;
    setValueGUID(ValueID, ValueName, Linkage, SourceFileName);
    ValueName.clear();
    break;
  }
  case bitc::VST_CODE_FNENTRY: {
    // VST_CODE_FNENTRY: [valueid, offset, namechar x N]
    if (convertToString(Record, 2, ValueName))
      return error("Invalid record");
    unsigned ValueID = Record[0];
    assert(!SourceFileName.empty())((!SourceFileName.empty()) ? static_cast<void> (0) : __assert_fail
 ("!SourceFileName.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4930, __PRETTY_FUNCTION__));
    auto VLI = ValueIdToLinkageMap.find(ValueID);
    assert(VLI != ValueIdToLinkageMap.end() &&((VLI != ValueIdToLinkageMap.end() && "No linkage found for VST entry?"
) ? static_cast<void> (0) : __assert_fail ("VLI != ValueIdToLinkageMap.end() && \"No linkage found for VST entry?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4933, __PRETTY_FUNCTION__))
           "No linkage found for VST entry?")((VLI != ValueIdToLinkageMap.end() && "No linkage found for VST entry?"
) ? static_cast<void> (0) : __assert_fail ("VLI != ValueIdToLinkageMap.end() && \"No linkage found for VST entry?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4933, __PRETTY_FUNCTION__));
    auto Linkage = VLI->second;
    setValueGUID(ValueID, ValueName, Linkage, SourceFileName);
    ValueName.clear();
    break;
  }
  case bitc::VST_CODE_COMBINED_ENTRY: {
    // VST_CODE_COMBINED_ENTRY: [valueid, refguid]
    unsigned ValueID = Record[0];
    GlobalValue::GUID RefGUID = Record[1];
    // The "original name", which is the second value of the pair will be
    // overriden later by a FS_COMBINED_ORIGINAL_NAME in the combined index.
    ValueIdToValueInfoMap[ValueID] =
        std::make_pair(TheIndex.getOrInsertValueInfo(RefGUID), RefGUID);
    break;
  }
  }
}
4951}

4953// Parse just the blocks needed for building the index out of the module.
4954// At the end of this routine the module Index is populated with a map
4955// from global value id to GlobalValueSummary objects.
4956Error ModuleSummaryIndexBitcodeReader::parseModule() {
if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;
DenseMap<unsigned, GlobalValue::LinkageTypes> ValueIdToLinkageMap;
unsigned ValueId = 0;

// Read the index for this module.
while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();

  case BitstreamEntry::SubBlock:
    switch (Entry.ID) {
    default: // Skip unknown content.
      if (Stream.SkipBlock())
        return error("Invalid record");
      break;
    case bitc::BLOCKINFO_BLOCK_ID:
      // Need to parse these to get abbrev ids (e.g. for VST)
      if (readBlockInfo())
        return error("Malformed block");
      break;
    case bitc::VALUE_SYMTAB_BLOCK_ID:
      // Should have been parsed earlier via VSTOffset, unless there
      // is no summary section.
      assert(((SeenValueSymbolTable && VSTOffset > 0) ||((((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary
) && "Expected early VST parse via VSTOffset record")
 ? static_cast<void> (0) : __assert_fail ("((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary) && \"Expected early VST parse via VSTOffset record\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4990, __PRETTY_FUNCTION__))
              !SeenGlobalValSummary) &&((((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary
) && "Expected early VST parse via VSTOffset record")
 ? static_cast<void> (0) : __assert_fail ("((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary) && \"Expected early VST parse via VSTOffset record\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4990, __PRETTY_FUNCTION__))
             "Expected early VST parse via VSTOffset record")((((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary
) && "Expected early VST parse via VSTOffset record")
 ? static_cast<void> (0) : __assert_fail ("((SeenValueSymbolTable && VSTOffset > 0) || !SeenGlobalValSummary) && \"Expected early VST parse via VSTOffset record\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4990, __PRETTY_FUNCTION__));
      if (Stream.SkipBlock())
        return error("Invalid record");
      break;
    case bitc::GLOBALVAL_SUMMARY_BLOCK_ID:
    case bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID:
      // Add the module if it is a per-module index (has a source file name).
      if (!SourceFileName.empty())
        addThisModule();
      assert(!SeenValueSymbolTable &&((!SeenValueSymbolTable && "Already read VST when parsing summary block?"
) ? static_cast<void> (0) : __assert_fail ("!SeenValueSymbolTable && \"Already read VST when parsing summary block?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5000, __PRETTY_FUNCTION__))
             "Already read VST when parsing summary block?")((!SeenValueSymbolTable && "Already read VST when parsing summary block?"
) ? static_cast<void> (0) : __assert_fail ("!SeenValueSymbolTable && \"Already read VST when parsing summary block?\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5000, __PRETTY_FUNCTION__));
      // We might not have a VST if there were no values in the
      // summary. An empty summary block generated when we are
      // performing ThinLTO compiles so we don't later invoke
      // the regular LTO process on them.
      if (VSTOffset > 0) {
        if (Error Err = parseValueSymbolTable(VSTOffset, ValueIdToLinkageMap))
          return Err;
        SeenValueSymbolTable = true;
      }
      SeenGlobalValSummary = true;
      if (Error Err = parseEntireSummary(Entry.ID))
        return Err;
      break;
    case bitc::MODULE_STRTAB_BLOCK_ID:
      if (Error Err = parseModuleStringTable())
        return Err;
      break;
    }
    continue;

  case BitstreamEntry::Record: {
      Record.clear();
      auto BitCode = Stream.readRecord(Entry.ID, Record);
      switch (BitCode) {
      default:
        break; // Default behavior, ignore unknown content.
      case bitc::MODULE_CODE_VERSION: {
        if (Error Err = parseVersionRecord(Record).takeError())
          return Err;
        break;
      }
      /// MODULE_CODE_SOURCE_FILENAME: [namechar x N]
      case bitc::MODULE_CODE_SOURCE_FILENAME: {
        SmallString<128> ValueName;
        if (convertToString(Record, 0, ValueName))
          return error("Invalid record");
        SourceFileName = ValueName.c_str();
        break;
      }
      /// MODULE_CODE_HASH: [5*i32]
      case bitc::MODULE_CODE_HASH: {
        if (Record.size() != 5)
          return error("Invalid hash length " + Twine(Record.size()).str());
        auto &Hash = getThisModule()->second.second;
        int Pos = 0;
        for (auto &Val : Record) {
          assert(!(Val >> 32) && "Unexpected high bits set")((!(Val >> 32) && "Unexpected high bits set") ?
 static_cast<void> (0) : __assert_fail ("!(Val >> 32) && \"Unexpected high bits set\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5047, __PRETTY_FUNCTION__));
          Hash[Pos++] = Val;
        }
        break;
      }
      /// MODULE_CODE_VSTOFFSET: [offset]
      case bitc::MODULE_CODE_VSTOFFSET:
        if (Record.size() < 1)
          return error("Invalid record");
        // Note that we subtract 1 here because the offset is relative to one
        // word before the start of the identification or module block, which
        // was historically always the start of the regular bitcode header.
        VSTOffset = Record[0] - 1;
        break;
      // v1 GLOBALVAR: [pointer type, isconst,     initid,       linkage, ...]
      // v1 FUNCTION:  [type,         callingconv, isproto,      linkage, ...]
      // v1 ALIAS:     [alias type,   addrspace,   aliasee val#, linkage, ...]
      // v2: [strtab offset, strtab size, v1]
      case bitc::MODULE_CODE_GLOBALVAR:
      case bitc::MODULE_CODE_FUNCTION:
      case bitc::MODULE_CODE_ALIAS: {
        StringRef Name;
        ArrayRef<uint64_t> GVRecord;
        std::tie(Name, GVRecord) = readNameFromStrtab(Record);
        if (GVRecord.size() <= 3)
          return error("Invalid record");
        uint64_t RawLinkage = GVRecord[3];
        GlobalValue::LinkageTypes Linkage = getDecodedLinkage(RawLinkage);
        if (!UseStrtab) {
          ValueIdToLinkageMap[ValueId++] = Linkage;
          break;
        }

        setValueGUID(ValueId++, Name, Linkage, SourceFileName);
        break;
      }
      }
    }
    continue;
  }
}
5088}

5090std::vector<ValueInfo>
5091ModuleSummaryIndexBitcodeReader::makeRefList(ArrayRef<uint64_t> Record) {
std::vector<ValueInfo> Ret;
Ret.reserve(Record.size());
for (uint64_t RefValueId : Record)
  Ret.push_back(getValueInfoFromValueId(RefValueId).first);
return Ret;
5097}

5099std::vector<FunctionSummary::EdgeTy>
5100ModuleSummaryIndexBitcodeReader::makeCallList(ArrayRef<uint64_t> Record,
                                            bool IsOldProfileFormat,
                                            bool HasProfile, bool HasRelBF) {
std::vector<FunctionSummary::EdgeTy> Ret;
Ret.reserve(Record.size());
for (unsigned I = 0, E = Record.size(); I != E; ++I) {
  CalleeInfo::HotnessType Hotness = CalleeInfo::HotnessType::Unknown;
  uint64_t RelBF = 0;
  ValueInfo Callee = getValueInfoFromValueId(Record[I]).first;
  if (IsOldProfileFormat) {
    I += 1; // Skip old callsitecount field
    if (HasProfile)
      I += 1; // Skip old profilecount field
  } else if (HasProfile)
    Hotness = static_cast<CalleeInfo::HotnessType>(Record[++I]);
  else if (HasRelBF)
    RelBF = Record[++I];
  Ret.push_back(FunctionSummary::EdgeTy{Callee, CalleeInfo(Hotness, RelBF)});
}
return Ret;
5120}

5122static void
5123parseWholeProgramDevirtResolutionByArg(ArrayRef<uint64_t> Record, size_t &Slot,
                                     WholeProgramDevirtResolution &Wpd) {
uint64_t ArgNum = Record[Slot++];
WholeProgramDevirtResolution::ByArg &B =
    Wpd.ResByArg[{Record.begin() + Slot, Record.begin() + Slot + ArgNum}];
Slot += ArgNum;

B.TheKind =
    static_cast<WholeProgramDevirtResolution::ByArg::Kind>(Record[Slot++]);
B.Info = Record[Slot++];
B.Byte = Record[Slot++];
B.Bit = Record[Slot++];
5135}

5137static void parseWholeProgramDevirtResolution(ArrayRef<uint64_t> Record,
                                            StringRef Strtab, size_t &Slot,
                                            TypeIdSummary &TypeId) {
uint64_t Id = Record[Slot++];
WholeProgramDevirtResolution &Wpd = TypeId.WPDRes[Id];

Wpd.TheKind = static_cast<WholeProgramDevirtResolution::Kind>(Record[Slot++]);
Wpd.SingleImplName = {Strtab.data() + Record[Slot],
                      static_cast<size_t>(Record[Slot + 1])};
Slot += 2;

uint64_t ResByArgNum = Record[Slot++];
for (uint64_t I = 0; I != ResByArgNum; ++I)
  parseWholeProgramDevirtResolutionByArg(Record, Slot, Wpd);
5151}

5153static void parseTypeIdSummaryRecord(ArrayRef<uint64_t> Record,
                                   StringRef Strtab,
                                   ModuleSummaryIndex &TheIndex) {
size_t Slot = 0;
TypeIdSummary &TypeId = TheIndex.getOrInsertTypeIdSummary(
    {Strtab.data() + Record[Slot], static_cast<size_t>(Record[Slot + 1])});
Slot += 2;

TypeId.TTRes.TheKind = static_cast<TypeTestResolution::Kind>(Record[Slot++]);
TypeId.TTRes.SizeM1BitWidth = Record[Slot++];
TypeId.TTRes.AlignLog2 = Record[Slot++];
TypeId.TTRes.SizeM1 = Record[Slot++];
TypeId.TTRes.BitMask = Record[Slot++];
TypeId.TTRes.InlineBits = Record[Slot++];

while (Slot < Record.size())
  parseWholeProgramDevirtResolution(Record, Strtab, Slot, TypeId);
5170}

5172// Eagerly parse the entire summary block. This populates the GlobalValueSummary
5173// objects in the index.
5174Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
if (Stream.EnterSubBlock(ID))
  return error("Invalid record");
SmallVector<uint64_t, 64> Record;

// Parse version
{
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
  if (Entry.Kind != BitstreamEntry::Record)
    return error("Invalid Summary Block: record for version expected");
  if (Stream.readRecord(Entry.ID, Record) != bitc::FS_VERSION)
    return error("Invalid Summary Block: version expected");
}
const uint64_t Version = Record[0];
const bool IsOldProfileFormat = Version == 1;
if (Version < 1 || Version > 4)
  return error("Invalid summary version " + Twine(Version) +
               ", 1, 2, 3 or 4 expected");
Record.clear();

// Keep around the last seen summary to be used when we see an optional
// "OriginalName" attachement.
GlobalValueSummary *LastSeenSummary = nullptr;
GlobalValue::GUID LastSeenGUID = 0;

// We can expect to see any number of type ID information records before
// each function summary records; these variables store the information
// collected so far so that it can be used to create the summary object.
std::vector<GlobalValue::GUID> PendingTypeTests;
std::vector<FunctionSummary::VFuncId> PendingTypeTestAssumeVCalls,
    PendingTypeCheckedLoadVCalls;
std::vector<FunctionSummary::ConstVCall> PendingTypeTestAssumeConstVCalls,
    PendingTypeCheckedLoadConstVCalls;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  // Read a record. The record format depends on whether this
  // is a per-module index or a combined index file. In the per-module
  // case the records contain the associated value's ID for correlation
  // with VST entries. In the combined index the correlation is done
  // via the bitcode offset of the summary records (which were saved
  // in the combined index VST entries). The records also contain
  // information used for ThinLTO renaming and importing.
  Record.clear();
  auto BitCode = Stream.readRecord(Entry.ID, Record);
  switch (BitCode) {
  default: // Default behavior: ignore.
    break;
  case bitc::FS_FLAGS: {  // [flags]
    uint64_t Flags = Record[0];
    // Scan flags (set only on the combined index).
    assert(Flags <= 0x3 && "Unexpected bits in flag")((Flags <= 0x3 && "Unexpected bits in flag") ? static_cast
<void> (0) : __assert_fail ("Flags <= 0x3 && \"Unexpected bits in flag\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5237, __PRETTY_FUNCTION__));

    // 1 bit: WithGlobalValueDeadStripping flag.
    if (Flags & 0x1)
      TheIndex.setWithGlobalValueDeadStripping();
    // 1 bit: SkipModuleByDistributedBackend flag.
    if (Flags & 0x2)
      TheIndex.setSkipModuleByDistributedBackend();
    break;
  }
  case bitc::FS_VALUE_GUID: { // [valueid, refguid]
    uint64_t ValueID = Record[0];
    GlobalValue::GUID RefGUID = Record[1];
    ValueIdToValueInfoMap[ValueID] =
        std::make_pair(TheIndex.getOrInsertValueInfo(RefGUID), RefGUID);
    break;
  }
  // FS_PERMODULE: [valueid, flags, instcount, fflags, numrefs,
  //                numrefs x valueid, n x (valueid)]
  // FS_PERMODULE_PROFILE: [valueid, flags, instcount, fflags, numrefs,
  //                        numrefs x valueid,
  //                        n x (valueid, hotness)]
  // FS_PERMODULE_RELBF: [valueid, flags, instcount, fflags, numrefs,
  //                      numrefs x valueid,
  //                      n x (valueid, relblockfreq)]
  case bitc::FS_PERMODULE:
  case bitc::FS_PERMODULE_RELBF:
  case bitc::FS_PERMODULE_PROFILE: {
    unsigned ValueID = Record[0];
    uint64_t RawFlags = Record[1];
    unsigned InstCount = Record[2];
    uint64_t RawFunFlags = 0;
    unsigned NumRefs = Record[3];
    int RefListStartIndex = 4;
    if (Version >= 4) {
      RawFunFlags = Record[3];
      NumRefs = Record[4];
      RefListStartIndex = 5;
    }

    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    // The module path string ref set in the summary must be owned by the
    // index's module string table. Since we don't have a module path
    // string table section in the per-module index, we create a single
    // module path string table entry with an empty (0) ID to take
    // ownership.
    int CallGraphEdgeStartIndex = RefListStartIndex + NumRefs;
    assert(Record.size() >= RefListStartIndex + NumRefs &&((Record.size() >= RefListStartIndex + NumRefs && "Record size inconsistent with number of references"
) ? static_cast<void> (0) : __assert_fail ("Record.size() >= RefListStartIndex + NumRefs && \"Record size inconsistent with number of references\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5285, __PRETTY_FUNCTION__))
           "Record size inconsistent with number of references")((Record.size() >= RefListStartIndex + NumRefs && "Record size inconsistent with number of references"
) ? static_cast<void> (0) : __assert_fail ("Record.size() >= RefListStartIndex + NumRefs && \"Record size inconsistent with number of references\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5285, __PRETTY_FUNCTION__));
    std::vector<ValueInfo> Refs = makeRefList(
        ArrayRef<uint64_t>(Record).slice(RefListStartIndex, NumRefs));
    bool HasProfile = (BitCode == bitc::FS_PERMODULE_PROFILE);
    bool HasRelBF = (BitCode == bitc::FS_PERMODULE_RELBF);
    std::vector<FunctionSummary::EdgeTy> Calls = makeCallList(
        ArrayRef<uint64_t>(Record).slice(CallGraphEdgeStartIndex),
        IsOldProfileFormat, HasProfile, HasRelBF);
    auto FS = llvm::make_unique<FunctionSummary>(
        Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
        std::move(Calls), std::move(PendingTypeTests),
        std::move(PendingTypeTestAssumeVCalls),
        std::move(PendingTypeCheckedLoadVCalls),
        std::move(PendingTypeTestAssumeConstVCalls),
        std::move(PendingTypeCheckedLoadConstVCalls));
    PendingTypeTests.clear();
    PendingTypeTestAssumeVCalls.clear();
    PendingTypeCheckedLoadVCalls.clear();
    PendingTypeTestAssumeConstVCalls.clear();
    PendingTypeCheckedLoadConstVCalls.clear();
    auto VIAndOriginalGUID = getValueInfoFromValueId(ValueID);
    FS->setModulePath(getThisModule()->first());
    FS->setOriginalName(VIAndOriginalGUID.second);
    TheIndex.addGlobalValueSummary(VIAndOriginalGUID.first, std::move(FS));
    break;
  }
  // FS_ALIAS: [valueid, flags, valueid]
  // Aliases must be emitted (and parsed) after all FS_PERMODULE entries, as
  // they expect all aliasee summaries to be available.
  case bitc::FS_ALIAS: {
    unsigned ValueID = Record[0];
    uint64_t RawFlags = Record[1];
    unsigned AliaseeID = Record[2];
    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    auto AS = llvm::make_unique<AliasSummary>(Flags);
    // The module path string ref set in the summary must be owned by the
    // index's module string table. Since we don't have a module path
    // string table section in the per-module index, we create a single
    // module path string table entry with an empty (0) ID to take
    // ownership.
    AS->setModulePath(getThisModule()->first());

    GlobalValue::GUID AliaseeGUID =
        getValueInfoFromValueId(AliaseeID).first.getGUID();
    auto AliaseeInModule =
        TheIndex.findSummaryInModule(AliaseeGUID, ModulePath);
    if (!AliaseeInModule)
      return error("Alias expects aliasee summary to be parsed");
    AS->setAliasee(AliaseeInModule);
    AS->setAliaseeGUID(AliaseeGUID);

    auto GUID = getValueInfoFromValueId(ValueID);
    AS->setOriginalName(GUID.second);
    TheIndex.addGlobalValueSummary(GUID.first, std::move(AS));
    break;
  }
  // FS_PERMODULE_GLOBALVAR_INIT_REFS: [valueid, flags, n x valueid]
  case bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS: {
    unsigned ValueID = Record[0];
    uint64_t RawFlags = Record[1];
    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    std::vector<ValueInfo> Refs =
        makeRefList(ArrayRef<uint64_t>(Record).slice(2));
    auto FS = llvm::make_unique<GlobalVarSummary>(Flags, std::move(Refs));
    FS->setModulePath(getThisModule()->first());
    auto GUID = getValueInfoFromValueId(ValueID);
    FS->setOriginalName(GUID.second);
    TheIndex.addGlobalValueSummary(GUID.first, std::move(FS));
    break;
  }
  // FS_COMBINED: [valueid, modid, flags, instcount, fflags, numrefs,
  //               numrefs x valueid, n x (valueid)]
  // FS_COMBINED_PROFILE: [valueid, modid, flags, instcount, fflags, numrefs,
  //                       numrefs x valueid, n x (valueid, hotness)]
  case bitc::FS_COMBINED:
  case bitc::FS_COMBINED_PROFILE: {
    unsigned ValueID = Record[0];
    uint64_t ModuleId = Record[1];
    uint64_t RawFlags = Record[2];
    unsigned InstCount = Record[3];
    uint64_t RawFunFlags = 0;
    unsigned NumRefs = Record[4];
    int RefListStartIndex = 5;

    if (Version >= 4) {
      RawFunFlags = Record[4];
      NumRefs = Record[5];
      RefListStartIndex = 6;
    }

    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    int CallGraphEdgeStartIndex = RefListStartIndex + NumRefs;
    assert(Record.size() >= RefListStartIndex + NumRefs &&((Record.size() >= RefListStartIndex + NumRefs && "Record size inconsistent with number of references"
) ? static_cast<void> (0) : __assert_fail ("Record.size() >= RefListStartIndex + NumRefs && \"Record size inconsistent with number of references\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5378, __PRETTY_FUNCTION__))
           "Record size inconsistent with number of references")((Record.size() >= RefListStartIndex + NumRefs && "Record size inconsistent with number of references"
) ? static_cast<void> (0) : __assert_fail ("Record.size() >= RefListStartIndex + NumRefs && \"Record size inconsistent with number of references\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5378, __PRETTY_FUNCTION__));
    std::vector<ValueInfo> Refs = makeRefList(
        ArrayRef<uint64_t>(Record).slice(RefListStartIndex, NumRefs));
    bool HasProfile = (BitCode == bitc::FS_COMBINED_PROFILE);
    std::vector<FunctionSummary::EdgeTy> Edges = makeCallList(
        ArrayRef<uint64_t>(Record).slice(CallGraphEdgeStartIndex),
        IsOldProfileFormat, HasProfile, false);
    ValueInfo VI = getValueInfoFromValueId(ValueID).first;
    auto FS = llvm::make_unique<FunctionSummary>(
        Flags, InstCount, getDecodedFFlags(RawFunFlags), std::move(Refs),
        std::move(Edges), std::move(PendingTypeTests),
        std::move(PendingTypeTestAssumeVCalls),
        std::move(PendingTypeCheckedLoadVCalls),
        std::move(PendingTypeTestAssumeConstVCalls),
        std::move(PendingTypeCheckedLoadConstVCalls));
    PendingTypeTests.clear();
    PendingTypeTestAssumeVCalls.clear();
    PendingTypeCheckedLoadVCalls.clear();
    PendingTypeTestAssumeConstVCalls.clear();
    PendingTypeCheckedLoadConstVCalls.clear();
    LastSeenSummary = FS.get();
    LastSeenGUID = VI.getGUID();
    FS->setModulePath(ModuleIdMap[ModuleId]);
    TheIndex.addGlobalValueSummary(VI, std::move(FS));
    break;
  }
  // FS_COMBINED_ALIAS: [valueid, modid, flags, valueid]
  // Aliases must be emitted (and parsed) after all FS_COMBINED entries, as
  // they expect all aliasee summaries to be available.
  case bitc::FS_COMBINED_ALIAS: {
    unsigned ValueID = Record[0];
    uint64_t ModuleId = Record[1];
    uint64_t RawFlags = Record[2];
    unsigned AliaseeValueId = Record[3];
    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    auto AS = llvm::make_unique<AliasSummary>(Flags);
    LastSeenSummary = AS.get();
    AS->setModulePath(ModuleIdMap[ModuleId]);

    auto AliaseeGUID =
        getValueInfoFromValueId(AliaseeValueId).first.getGUID();
    auto AliaseeInModule =
        TheIndex.findSummaryInModule(AliaseeGUID, AS->modulePath());
    AS->setAliasee(AliaseeInModule);
    AS->setAliaseeGUID(AliaseeGUID);

    ValueInfo VI = getValueInfoFromValueId(ValueID).first;
    LastSeenGUID = VI.getGUID();
    TheIndex.addGlobalValueSummary(VI, std::move(AS));
    break;
  }
  // FS_COMBINED_GLOBALVAR_INIT_REFS: [valueid, modid, flags, n x valueid]
  case bitc::FS_COMBINED_GLOBALVAR_INIT_REFS: {
    unsigned ValueID = Record[0];
    uint64_t ModuleId = Record[1];
    uint64_t RawFlags = Record[2];
    auto Flags = getDecodedGVSummaryFlags(RawFlags, Version);
    std::vector<ValueInfo> Refs =
        makeRefList(ArrayRef<uint64_t>(Record).slice(3));
    auto FS = llvm::make_unique<GlobalVarSummary>(Flags, std::move(Refs));
    LastSeenSummary = FS.get();
    FS->setModulePath(ModuleIdMap[ModuleId]);
    ValueInfo VI = getValueInfoFromValueId(ValueID).first;
    LastSeenGUID = VI.getGUID();
    TheIndex.addGlobalValueSummary(VI, std::move(FS));
    break;
  }
  // FS_COMBINED_ORIGINAL_NAME: [original_name]
  case bitc::FS_COMBINED_ORIGINAL_NAME: {
    uint64_t OriginalName = Record[0];
    if (!LastSeenSummary)
      return error("Name attachment that does not follow a combined record");
    LastSeenSummary->setOriginalName(OriginalName);
    TheIndex.addOriginalName(LastSeenGUID, OriginalName);
    // Reset the LastSeenSummary
    LastSeenSummary = nullptr;
    LastSeenGUID = 0;
    break;
  }
  case bitc::FS_TYPE_TESTS:
    assert(PendingTypeTests.empty())((PendingTypeTests.empty()) ? static_cast<void> (0) : __assert_fail
 ("PendingTypeTests.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5458, __PRETTY_FUNCTION__));
    PendingTypeTests.insert(PendingTypeTests.end(), Record.begin(),
                            Record.end());
    break;

  case bitc::FS_TYPE_TEST_ASSUME_VCALLS:
    assert(PendingTypeTestAssumeVCalls.empty())((PendingTypeTestAssumeVCalls.empty()) ? static_cast<void>
 (0) : __assert_fail ("PendingTypeTestAssumeVCalls.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5464, __PRETTY_FUNCTION__));
    for (unsigned I = 0; I != Record.size(); I += 2)
      PendingTypeTestAssumeVCalls.push_back({Record[I], Record[I+1]});
    break;

  case bitc::FS_TYPE_CHECKED_LOAD_VCALLS:
    assert(PendingTypeCheckedLoadVCalls.empty())((PendingTypeCheckedLoadVCalls.empty()) ? static_cast<void
> (0) : __assert_fail ("PendingTypeCheckedLoadVCalls.empty()"
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5470, __PRETTY_FUNCTION__));
    for (unsigned I = 0; I != Record.size(); I += 2)
      PendingTypeCheckedLoadVCalls.push_back({Record[I], Record[I+1]});
    break;

  case bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL:
    PendingTypeTestAssumeConstVCalls.push_back(
        {{Record[0], Record[1]}, {Record.begin() + 2, Record.end()}});
    break;

  case bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL:
    PendingTypeCheckedLoadConstVCalls.push_back(
        {{Record[0], Record[1]}, {Record.begin() + 2, Record.end()}});
    break;

  case bitc::FS_CFI_FUNCTION_DEFS: {
    std::set<std::string> &CfiFunctionDefs = TheIndex.cfiFunctionDefs();
    for (unsigned I = 0; I != Record.size(); I += 2)
      CfiFunctionDefs.insert(
          {Strtab.data() + Record[I], static_cast<size_t>(Record[I + 1])});
    break;
  }

  case bitc::FS_CFI_FUNCTION_DECLS: {
    std::set<std::string> &CfiFunctionDecls = TheIndex.cfiFunctionDecls();
    for (unsigned I = 0; I != Record.size(); I += 2)
      CfiFunctionDecls.insert(
          {Strtab.data() + Record[I], static_cast<size_t>(Record[I + 1])});
    break;
  }

  case bitc::FS_TYPE_ID:
    parseTypeIdSummaryRecord(Record, Strtab, TheIndex);
    break;
  }
}
llvm_unreachable("Exit infinite loop")::llvm::llvm_unreachable_internal("Exit infinite loop", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5506);
5507}

5509// Parse the  module string table block into the Index.
5510// This populates the ModulePathStringTable map in the index.
5511Error ModuleSummaryIndexBitcodeReader::parseModuleStringTable() {
if (Stream.EnterSubBlock(bitc::MODULE_STRTAB_BLOCK_ID))
  return error("Invalid record");

SmallVector<uint64_t, 64> Record;

SmallString<128> ModulePath;
ModuleSummaryIndex::ModuleInfo *LastSeenModule = nullptr;

while (true) {
  BitstreamEntry Entry = Stream.advanceSkippingSubblocks();

  switch (Entry.Kind) {
  case BitstreamEntry::SubBlock: // Handled for us already.
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return Error::success();
  case BitstreamEntry::Record:
    // The interesting case.
    break;
  }

  Record.clear();
  switch (Stream.readRecord(Entry.ID, Record)) {
  default: // Default behavior: ignore.
    break;
  case bitc::MST_CODE_ENTRY: {
    // MST_ENTRY: [modid, namechar x N]
    uint64_t ModuleId = Record[0];

    if (convertToString(Record, 1, ModulePath))
      return error("Invalid record");

    LastSeenModule = TheIndex.addModule(ModulePath, ModuleId);
    ModuleIdMap[ModuleId] = LastSeenModule->first();

    ModulePath.clear();
    break;
  }
  /// MST_CODE_HASH: [5*i32]
  case bitc::MST_CODE_HASH: {
    if (Record.size() != 5)
      return error("Invalid hash length " + Twine(Record.size()).str());
    if (!LastSeenModule)
      return error("Invalid hash that does not follow a module path");
    int Pos = 0;
    for (auto &Val : Record) {
      assert(!(Val >> 32) && "Unexpected high bits set")((!(Val >> 32) && "Unexpected high bits set") ?
 static_cast<void> (0) : __assert_fail ("!(Val >> 32) && \"Unexpected high bits set\""
, "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5559, __PRETTY_FUNCTION__));
      LastSeenModule->second.second[Pos++] = Val;
    }
    // Reset LastSeenModule to avoid overriding the hash unexpectedly.
    LastSeenModule = nullptr;
    break;
  }
  }
}
llvm_unreachable("Exit infinite loop")::llvm::llvm_unreachable_internal("Exit infinite loop", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5568);
5569}

5571namespace {

5573// FIXME: This class is only here to support the transition to llvm::Error. It
5574// will be removed once this transition is complete. Clients should prefer to
5575// deal with the Error value directly, rather than converting to error_code.
5576class BitcodeErrorCategoryType : public std::error_category {
const char *name() const noexcept override {
  return "llvm.bitcode";
}

std::string message(int IE) const override {
  BitcodeError E = static_cast<BitcodeError>(IE);
  switch (E) {
  case BitcodeError::CorruptedBitcode:
    return "Corrupted bitcode";
  }
  llvm_unreachable("Unknown error type!")::llvm::llvm_unreachable_internal("Unknown error type!", "/build/llvm-toolchain-snapshot-8~svn345461/lib/Bitcode/Reader/BitcodeReader.cpp"
, 5587);
}
5589};

5591} // end anonymous namespace

5593static ManagedStatic<BitcodeErrorCategoryType> ErrorCategory;

5595const std::error_category &llvm::BitcodeErrorCategory() {
return *ErrorCategory;
5597}

5599static Expected<StringRef> readBlobInRecord(BitstreamCursor &Stream,
                                          unsigned Block, unsigned RecordID) {
if (Stream.EnterSubBlock(Block))
  return error("Invalid record");

StringRef Strtab;
while (true) {
  BitstreamEntry Entry = Stream.advance();
  switch (Entry.Kind) {
  case BitstreamEntry::EndBlock:
    return Strtab;

  case BitstreamEntry::Error:
    return error("Malformed block");

  case BitstreamEntry::SubBlock:
    if (Stream.SkipBlock())
      return error("Malformed block");
    break;

  case BitstreamEntry::Record:
    StringRef Blob;
    SmallVector<uint64_t, 1> Record;
    if (Stream.readRecord(Entry.ID, Record, &Blob) == RecordID)
      Strtab = Blob;
    break;
  }
}
5627}

5629//===----------------------------------------------------------------------===//
5630// External interface
5631//===----------------------------------------------------------------------===//

5633Expected<std::vector<BitcodeModule>>
5634llvm::getBitcodeModuleList(MemoryBufferRef Buffer) {
auto FOrErr = getBitcodeFileContents(Buffer);
if (!FOrErr)
  return FOrErr.takeError();
return std::move(FOrErr->Mods);
5639}

5641Expected<BitcodeFileContents>
5642llvm::getBitcodeFileContents(MemoryBufferRef Buffer) {
Expected<BitstreamCursor> StreamOrErr = initStream(Buffer);
if (!StreamOrErr)
  return StreamOrErr.takeError();
BitstreamCursor &Stream = *StreamOrErr;

BitcodeFileContents F;
while (true) {
  uint64_t BCBegin = Stream.getCurrentByteNo();

  // We may be consuming bitcode from a client that leaves garbage at the end
  // of the bitcode stream (e.g. Apple's ar tool). If we are close enough to
  // the end that there cannot possibly be another module, stop looking.
  if (BCBegin + 8 >= Stream.getBitcodeBytes().size())
    return F;

  BitstreamEntry Entry = Stream.advance();
  switch (Entry.Kind) {
  case BitstreamEntry::EndBlock:
  case BitstreamEntry::Error:
    return error("Malformed block");

  case BitstreamEntry::SubBlock: {
    uint64_t IdentificationBit = -1ull;
    if (Entry.ID == bitc::IDENTIFICATION_BLOCK_ID) {
      IdentificationBit = Stream.GetCurrentBitNo() - BCBegin * 8;
      if (Stream.SkipBlock())
        return error("Malformed block");

      Entry = Stream.advance();
      if (Entry.Kind != BitstreamEntry::SubBlock ||
          Entry.ID != bitc::MODULE_BLOCK_ID)
        return error("Malformed block");
    }

    if (Entry.ID == bitc::MODULE_BLOCK_ID) {
      uint64_t ModuleBit = Stream.GetCurrentBitNo() - BCBegin * 8;
      if (Stream.SkipBlock())
        return error("Malformed block");

      F.Mods.push_back({Stream.getBitcodeBytes().slice(
                            BCBegin, Stream.getCurrentByteNo() - BCBegin),
                        Buffer.getBufferIdentifier(), IdentificationBit,
                        ModuleBit});
      continue;
    }

    if (Entry.ID == bitc::STRTAB_BLOCK_ID) {
      Expected<StringRef> Strtab =
          readBlobInRecord(Stream, bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB);
      if (!Strtab)
        return Strtab.takeError();
      // This string table is used by every preceding bitcode module that does
      // not have its own string table. A bitcode file may have multiple
      // string tables if it was created by binary concatenation, for example
      // with "llvm-cat -b".
      for (auto I = F.Mods.rbegin(), E = F.Mods.rend(); I != E; ++I) {
        if (!I->Strtab.empty())
          break;
        I->Strtab = *Strtab;
      }
      // Similarly, the string table is used by every preceding symbol table;
      // normally there will be just one unless the bitcode file was created
      // by binary concatenation.
      if (!F.Symtab.empty() && F.StrtabForSymtab.empty())
        F.StrtabForSymtab = *Strtab;
      continue;
    }

    if (Entry.ID == bitc::SYMTAB_BLOCK_ID) {
      Expected<StringRef> SymtabOrErr =
          readBlobInRecord(Stream, bitc::SYMTAB_BLOCK_ID, bitc::SYMTAB_BLOB);
      if (!SymtabOrErr)
        return SymtabOrErr.takeError();

      // We can expect the bitcode file to have multiple symbol tables if it
      // was created by binary concatenation. In that case we silently
      // ignore any subsequent symbol tables, which is fine because this is a
      // low level function. The client is expected to notice that the number
      // of modules in the symbol table does not match the number of modules
      // in the input file and regenerate the symbol table.
      if (F.Symtab.empty())
        F.Symtab = *SymtabOrErr;
      continue;
    }

    if (Stream.SkipBlock())
      return error("Malformed block");
    continue;
  }
  case BitstreamEntry::Record:
    Stream.skipRecord(Entry.ID);
    continue;
  }
}
5737}

5739/// Get a lazy one-at-time loading module from bitcode.
5740///
5741/// This isn't always used in a lazy context.  In particular, it's also used by
5742/// \a parseModule().  If this is truly lazy, then we need to eagerly pull
5743/// in forward-referenced functions from block address references.
5744///
5745/// \param[in] MaterializeAll Set to \c true if we should materialize
5746/// everything.
5747Expected<std::unique_ptr<Module>>
5748BitcodeModule::getModuleImpl(LLVMContext &Context, bool MaterializeAll,
                           bool ShouldLazyLoadMetadata, bool IsImporting) {
BitstreamCursor Stream(Buffer);

std::string ProducerIdentification;
if (IdentificationBit != -1ull) {
  Stream.JumpToBit(IdentificationBit);
  Expected<std::string> ProducerIdentificationOrErr =
      readIdentificationBlock(Stream);
  if (!ProducerIdentificationOrErr)
    return ProducerIdentificationOrErr.takeError();

  ProducerIdentification = *ProducerIdentificationOrErr;
}

Stream.JumpToBit(ModuleBit);
auto *R = new BitcodeReader(std::move(Stream), Strtab, ProducerIdentification,
                            Context);

std::unique_ptr<Module> M =
    llvm::make_unique<Module>(ModuleIdentifier, Context);
M->setMaterializer(R);

// Delay parsing Metadata if ShouldLazyLoadMetadata is true.
if (Error Err =
        R->parseBitcodeInto(M.get(), ShouldLazyLoadMetadata, IsImporting))
  return std::move(Err);

if (MaterializeAll) {
  // Read in the entire module, and destroy the BitcodeReader.
  if (Error Err = M->materializeAll())
    return std::move(Err);
} else {
  // Resolve forward references from blockaddresses.
  if (Error Err = R->materializeForwardReferencedFunctions())
    return std::move(Err);
}
return std::move(M);
5786}

5788Expected<std::unique_ptr<Module>>
5789BitcodeModule::getLazyModule(LLVMContext &Context, bool ShouldLazyLoadMetadata,
                           bool IsImporting) {
return getModuleImpl(Context, false, ShouldLazyLoadMetadata, IsImporting);
5792}

5794// Parse the specified bitcode buffer and merge the index into CombinedIndex.
5795// We don't use ModuleIdentifier here because the client may need to control the
5796// module path used in the combined summary (e.g. when reading summaries for
5797// regular LTO modules).
5798Error BitcodeModule::readSummary(ModuleSummaryIndex &CombinedIndex,
                               StringRef ModulePath, uint64_t ModuleId) {
BitstreamCursor Stream(Buffer);
Stream.JumpToBit(ModuleBit);

ModuleSummaryIndexBitcodeReader R(std::move(Stream), Strtab, CombinedIndex,
                                  ModulePath, ModuleId);
return R.parseModule();
5806}

5808// Parse the specified bitcode buffer, returning the function info index.
5809Expected<std::unique_ptr<ModuleSummaryIndex>> BitcodeModule::getSummary() {
BitstreamCursor Stream(Buffer);
Stream.JumpToBit(ModuleBit);

auto Index = llvm::make_unique<ModuleSummaryIndex>(/*HaveGVs=*/false);
ModuleSummaryIndexBitcodeReader R(std::move(Stream), Strtab, *Index,
                                  ModuleIdentifier, 0);

if (Error Err = R.parseModule())
  return std::move(Err);

return std::move(Index);
5821}

5823// Check if the given bitcode buffer contains a global value summary block.
5824Expected<BitcodeLTOInfo> BitcodeModule::getLTOInfo() {
BitstreamCursor Stream(Buffer);
Stream.JumpToBit(ModuleBit);

if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
  return error("Invalid record");

while (true) {
  BitstreamEntry Entry = Stream.advance();

  switch (Entry.Kind) {
  case BitstreamEntry::Error:
    return error("Malformed block");
  case BitstreamEntry::EndBlock:
    return BitcodeLTOInfo{/*IsThinLTO=*/false, /*HasSummary=*/false};

  case BitstreamEntry::SubBlock:
    if (Entry.ID == bitc::GLOBALVAL_SUMMARY_BLOCK_ID)
      return BitcodeLTOInfo{/*IsThinLTO=*/true, /*HasSummary=*/true};

    if (Entry.ID == bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID)
      return BitcodeLTOInfo{/*IsThinLTO=*/false, /*HasSummary=*/true};

    // Ignore other sub-blocks.
    if (Stream.SkipBlock())
      return error("Malformed block");
    continue;

  case BitstreamEntry::Record:
    Stream.skipRecord(Entry.ID);
    continue;
  }
}
5857}

5859static Expected<BitcodeModule> getSingleModule(MemoryBufferRef Buffer) {
Expected<std::vector<BitcodeModule>> MsOrErr = getBitcodeModuleList(Buffer);
if (!MsOrErr)
  return MsOrErr.takeError();

if (MsOrErr->size() != 1)
  return error("Expected a single module");

return (*MsOrErr)[0];
5868}

5870Expected<std::unique_ptr<Module>>
5871llvm::getLazyBitcodeModule(MemoryBufferRef Buffer, LLVMContext &Context,
                         bool ShouldLazyLoadMetadata, bool IsImporting) {
Expected<BitcodeModule> BM = getSingleModule(Buffer);
if (!BM)
  return BM.takeError();

return BM->getLazyModule(Context, ShouldLazyLoadMetadata, IsImporting);
5878}

5880Expected<std::unique_ptr<Module>> llvm::getOwningLazyBitcodeModule(
  std::unique_ptr<MemoryBuffer> &&Buffer, LLVMContext &Context,
  bool ShouldLazyLoadMetadata, bool IsImporting) {
auto MOrErr = getLazyBitcodeModule(*Buffer, Context, ShouldLazyLoadMetadata,
                                   IsImporting);
if (MOrErr)
  (*MOrErr)->setOwnedMemoryBuffer(std::move(Buffer));
return MOrErr;
5888}

5890Expected<std::unique_ptr<Module>>
5891BitcodeModule::parseModule(LLVMContext &Context) {
return getModuleImpl(Context, true, false, false);
// TODO: Restore the use-lists to the in-memory state when the bitcode was
// written.  We must defer until the Module has been fully materialized.
5895}

5897Expected<std::unique_ptr<Module>> llvm::parseBitcodeFile(MemoryBufferRef Buffer,
                                                       LLVMContext &Context) {
Expected<BitcodeModule> BM = getSingleModule(Buffer);
if (!BM)
  return BM.takeError();

return BM->parseModule(Context);
5904}

5906Expected<std::string> llvm::getBitcodeTargetTriple(MemoryBufferRef Buffer) {
Expected<BitstreamCursor> StreamOrErr = initStream(Buffer);
if (!StreamOrErr)
  return StreamOrErr.takeError();

return readTriple(*StreamOrErr);
5912}

5914Expected<bool> llvm::isBitcodeContainingObjCCategory(MemoryBufferRef Buffer) {
Expected<BitstreamCursor> StreamOrErr = initStream(Buffer);
if (!StreamOrErr)
  return StreamOrErr.takeError();

return hasObjCCategory(*StreamOrErr);
5920}

5922Expected<std::string> llvm::getBitcodeProducerString(MemoryBufferRef Buffer) {
Expected<BitstreamCursor> StreamOrErr = initStream(Buffer);
if (!StreamOrErr)
  return StreamOrErr.takeError();

return readIdentificationCode(*StreamOrErr);
5928}

5930Error llvm::readModuleSummaryIndex(MemoryBufferRef Buffer,
                                 ModuleSummaryIndex &CombinedIndex,
                                 uint64_t ModuleId) {
Expected<BitcodeModule> BM = getSingleModule(Buffer);
if (!BM)
  return BM.takeError();

return BM->readSummary(CombinedIndex, BM->getModuleIdentifier(), ModuleId);
5938}

5940Expected<std::unique_ptr<ModuleSummaryIndex>>
5941llvm::getModuleSummaryIndex(MemoryBufferRef Buffer) {
Expected<BitcodeModule> BM = getSingleModule(Buffer);
if (!BM)
  return BM.takeError();

return BM->getSummary();
5947}

5949Expected<BitcodeLTOInfo> llvm::getBitcodeLTOInfo(MemoryBufferRef Buffer) {
Expected<BitcodeModule> BM = getSingleModule(Buffer);
if (!BM)
  return BM.takeError();

return BM->getLTOInfo();
5955}

5957Expected<std::unique_ptr<ModuleSummaryIndex>>
5958llvm::getModuleSummaryIndexForFile(StringRef Path,
                                 bool IgnoreEmptyThinLTOIndexFile) {
ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
    MemoryBuffer::getFileOrSTDIN(Path);
if (!FileOrErr)
  return errorCodeToError(FileOrErr.getError());
if (IgnoreEmptyThinLTOIndexFile && !(*FileOrErr)->getBufferSize())
  return nullptr;
return getModuleSummaryIndex(**FileOrErr);
5967}