LLVM  3.7.0
BitstreamWriter.h
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1 //===- BitstreamWriter.h - Low-level bitstream writer interface -*- C++ -*-===//
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 //===----------------------------------------------------------------------===//
9 //
10 // This header defines the BitstreamWriter class. This class can be used to
11 // write an arbitrary bitstream, regardless of its contents.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_BITCODE_BITSTREAMWRITER_H
16 #define LLVM_BITCODE_BITSTREAMWRITER_H
17 
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/Bitcode/BitCodes.h"
21 #include "llvm/Support/Endian.h"
22 #include <vector>
23 
24 namespace llvm {
25 
28 
29  /// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
30  unsigned CurBit;
31 
32  /// CurValue - The current value. Only bits < CurBit are valid.
33  uint32_t CurValue;
34 
35  /// CurCodeSize - This is the declared size of code values used for the
36  /// current block, in bits.
37  unsigned CurCodeSize;
38 
39  /// BlockInfoCurBID - When emitting a BLOCKINFO_BLOCK, this is the currently
40  /// selected BLOCK ID.
41  unsigned BlockInfoCurBID;
42 
43  /// CurAbbrevs - Abbrevs installed at in this block.
44  std::vector<IntrusiveRefCntPtr<BitCodeAbbrev>> CurAbbrevs;
45 
46  struct Block {
47  unsigned PrevCodeSize;
48  unsigned StartSizeWord;
49  std::vector<IntrusiveRefCntPtr<BitCodeAbbrev>> PrevAbbrevs;
50  Block(unsigned PCS, unsigned SSW) : PrevCodeSize(PCS), StartSizeWord(SSW) {}
51  };
52 
53  /// BlockScope - This tracks the current blocks that we have entered.
54  std::vector<Block> BlockScope;
55 
56  /// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
57  /// These describe abbreviations that all blocks of the specified ID inherit.
58  struct BlockInfo {
59  unsigned BlockID;
60  std::vector<IntrusiveRefCntPtr<BitCodeAbbrev>> Abbrevs;
61  };
62  std::vector<BlockInfo> BlockInfoRecords;
63 
64  // BackpatchWord - Backpatch a 32-bit word in the output with the specified
65  // value.
66  void BackpatchWord(unsigned ByteNo, unsigned NewWord) {
67  support::endian::write32le(&Out[ByteNo], NewWord);
68  }
69 
70  void WriteByte(unsigned char Value) {
71  Out.push_back(Value);
72  }
73 
74  void WriteWord(unsigned Value) {
75  Value = support::endian::byte_swap<uint32_t, support::little>(Value);
76  Out.append(reinterpret_cast<const char *>(&Value),
77  reinterpret_cast<const char *>(&Value + 1));
78  }
79 
80  unsigned GetBufferOffset() const {
81  return Out.size();
82  }
83 
84  unsigned GetWordIndex() const {
85  unsigned Offset = GetBufferOffset();
86  assert((Offset & 3) == 0 && "Not 32-bit aligned");
87  return Offset / 4;
88  }
89 
90 public:
92  : Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
93 
95  assert(CurBit == 0 && "Unflushed data remaining");
96  assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
97  }
98 
99  /// \brief Retrieve the current position in the stream, in bits.
100  uint64_t GetCurrentBitNo() const { return GetBufferOffset() * 8 + CurBit; }
101 
102  //===--------------------------------------------------------------------===//
103  // Basic Primitives for emitting bits to the stream.
104  //===--------------------------------------------------------------------===//
105 
106  void Emit(uint32_t Val, unsigned NumBits) {
107  assert(NumBits && NumBits <= 32 && "Invalid value size!");
108  assert((Val & ~(~0U >> (32-NumBits))) == 0 && "High bits set!");
109  CurValue |= Val << CurBit;
110  if (CurBit + NumBits < 32) {
111  CurBit += NumBits;
112  return;
113  }
114 
115  // Add the current word.
116  WriteWord(CurValue);
117 
118  if (CurBit)
119  CurValue = Val >> (32-CurBit);
120  else
121  CurValue = 0;
122  CurBit = (CurBit+NumBits) & 31;
123  }
124 
125  void Emit64(uint64_t Val, unsigned NumBits) {
126  if (NumBits <= 32)
127  Emit((uint32_t)Val, NumBits);
128  else {
129  Emit((uint32_t)Val, 32);
130  Emit((uint32_t)(Val >> 32), NumBits-32);
131  }
132  }
133 
134  void FlushToWord() {
135  if (CurBit) {
136  WriteWord(CurValue);
137  CurBit = 0;
138  CurValue = 0;
139  }
140  }
141 
142  void EmitVBR(uint32_t Val, unsigned NumBits) {
143  assert(NumBits <= 32 && "Too many bits to emit!");
144  uint32_t Threshold = 1U << (NumBits-1);
145 
146  // Emit the bits with VBR encoding, NumBits-1 bits at a time.
147  while (Val >= Threshold) {
148  Emit((Val & ((1 << (NumBits-1))-1)) | (1 << (NumBits-1)), NumBits);
149  Val >>= NumBits-1;
150  }
151 
152  Emit(Val, NumBits);
153  }
154 
155  void EmitVBR64(uint64_t Val, unsigned NumBits) {
156  assert(NumBits <= 32 && "Too many bits to emit!");
157  if ((uint32_t)Val == Val)
158  return EmitVBR((uint32_t)Val, NumBits);
159 
160  uint32_t Threshold = 1U << (NumBits-1);
161 
162  // Emit the bits with VBR encoding, NumBits-1 bits at a time.
163  while (Val >= Threshold) {
164  Emit(((uint32_t)Val & ((1 << (NumBits-1))-1)) |
165  (1 << (NumBits-1)), NumBits);
166  Val >>= NumBits-1;
167  }
168 
169  Emit((uint32_t)Val, NumBits);
170  }
171 
172  /// EmitCode - Emit the specified code.
173  void EmitCode(unsigned Val) {
174  Emit(Val, CurCodeSize);
175  }
176 
177  //===--------------------------------------------------------------------===//
178  // Block Manipulation
179  //===--------------------------------------------------------------------===//
180 
181  /// getBlockInfo - If there is block info for the specified ID, return it,
182  /// otherwise return null.
183  BlockInfo *getBlockInfo(unsigned BlockID) {
184  // Common case, the most recent entry matches BlockID.
185  if (!BlockInfoRecords.empty() && BlockInfoRecords.back().BlockID == BlockID)
186  return &BlockInfoRecords.back();
187 
188  for (unsigned i = 0, e = static_cast<unsigned>(BlockInfoRecords.size());
189  i != e; ++i)
190  if (BlockInfoRecords[i].BlockID == BlockID)
191  return &BlockInfoRecords[i];
192  return nullptr;
193  }
194 
195  void EnterSubblock(unsigned BlockID, unsigned CodeLen) {
196  // Block header:
197  // [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
199  EmitVBR(BlockID, bitc::BlockIDWidth);
200  EmitVBR(CodeLen, bitc::CodeLenWidth);
201  FlushToWord();
202 
203  unsigned BlockSizeWordIndex = GetWordIndex();
204  unsigned OldCodeSize = CurCodeSize;
205 
206  // Emit a placeholder, which will be replaced when the block is popped.
208 
209  CurCodeSize = CodeLen;
210 
211  // Push the outer block's abbrev set onto the stack, start out with an
212  // empty abbrev set.
213  BlockScope.emplace_back(OldCodeSize, BlockSizeWordIndex);
214  BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
215 
216  // If there is a blockinfo for this BlockID, add all the predefined abbrevs
217  // to the abbrev list.
218  if (BlockInfo *Info = getBlockInfo(BlockID)) {
219  CurAbbrevs.insert(CurAbbrevs.end(), Info->Abbrevs.begin(),
220  Info->Abbrevs.end());
221  }
222  }
223 
224  void ExitBlock() {
225  assert(!BlockScope.empty() && "Block scope imbalance!");
226  const Block &B = BlockScope.back();
227 
228  // Block tail:
229  // [END_BLOCK, <align4bytes>]
231  FlushToWord();
232 
233  // Compute the size of the block, in words, not counting the size field.
234  unsigned SizeInWords = GetWordIndex() - B.StartSizeWord - 1;
235  unsigned ByteNo = B.StartSizeWord*4;
236 
237  // Update the block size field in the header of this sub-block.
238  BackpatchWord(ByteNo, SizeInWords);
239 
240  // Restore the inner block's code size and abbrev table.
241  CurCodeSize = B.PrevCodeSize;
242  CurAbbrevs = std::move(B.PrevAbbrevs);
243  BlockScope.pop_back();
244  }
245 
246  //===--------------------------------------------------------------------===//
247  // Record Emission
248  //===--------------------------------------------------------------------===//
249 
250 private:
251  /// EmitAbbreviatedLiteral - Emit a literal value according to its abbrev
252  /// record. This is a no-op, since the abbrev specifies the literal to use.
253  template<typename uintty>
254  void EmitAbbreviatedLiteral(const BitCodeAbbrevOp &Op, uintty V) {
255  assert(Op.isLiteral() && "Not a literal");
256  // If the abbrev specifies the literal value to use, don't emit
257  // anything.
258  assert(V == Op.getLiteralValue() &&
259  "Invalid abbrev for record!");
260  }
261 
262  /// EmitAbbreviatedField - Emit a single scalar field value with the specified
263  /// encoding.
264  template<typename uintty>
265  void EmitAbbreviatedField(const BitCodeAbbrevOp &Op, uintty V) {
266  assert(!Op.isLiteral() && "Literals should use EmitAbbreviatedLiteral!");
267 
268  // Encode the value as we are commanded.
269  switch (Op.getEncoding()) {
270  default: llvm_unreachable("Unknown encoding!");
272  if (Op.getEncodingData())
273  Emit((unsigned)V, (unsigned)Op.getEncodingData());
274  break;
276  if (Op.getEncodingData())
277  EmitVBR64(V, (unsigned)Op.getEncodingData());
278  break;
280  Emit(BitCodeAbbrevOp::EncodeChar6((char)V), 6);
281  break;
282  }
283  }
284 
285  /// EmitRecordWithAbbrevImpl - This is the core implementation of the record
286  /// emission code. If BlobData is non-null, then it specifies an array of
287  /// data that should be emitted as part of the Blob or Array operand that is
288  /// known to exist at the end of the record.
289  template<typename uintty>
290  void EmitRecordWithAbbrevImpl(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
291  StringRef Blob) {
292  const char *BlobData = Blob.data();
293  unsigned BlobLen = (unsigned) Blob.size();
294  unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
295  assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
296  const BitCodeAbbrev *Abbv = CurAbbrevs[AbbrevNo].get();
297 
298  EmitCode(Abbrev);
299 
300  unsigned RecordIdx = 0;
301  for (unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
302  i != e; ++i) {
303  const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
304  if (Op.isLiteral()) {
305  assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
306  EmitAbbreviatedLiteral(Op, Vals[RecordIdx]);
307  ++RecordIdx;
308  } else if (Op.getEncoding() == BitCodeAbbrevOp::Array) {
309  // Array case.
310  assert(i+2 == e && "array op not second to last?");
311  const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
312 
313  // If this record has blob data, emit it, otherwise we must have record
314  // entries to encode this way.
315  if (BlobData) {
316  assert(RecordIdx == Vals.size() &&
317  "Blob data and record entries specified for array!");
318  // Emit a vbr6 to indicate the number of elements present.
319  EmitVBR(static_cast<uint32_t>(BlobLen), 6);
320 
321  // Emit each field.
322  for (unsigned i = 0; i != BlobLen; ++i)
323  EmitAbbreviatedField(EltEnc, (unsigned char)BlobData[i]);
324 
325  // Know that blob data is consumed for assertion below.
326  BlobData = nullptr;
327  } else {
328  // Emit a vbr6 to indicate the number of elements present.
329  EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
330 
331  // Emit each field.
332  for (unsigned e = Vals.size(); RecordIdx != e; ++RecordIdx)
333  EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
334  }
335  } else if (Op.getEncoding() == BitCodeAbbrevOp::Blob) {
336  // If this record has blob data, emit it, otherwise we must have record
337  // entries to encode this way.
338 
339  // Emit a vbr6 to indicate the number of elements present.
340  if (BlobData) {
341  EmitVBR(static_cast<uint32_t>(BlobLen), 6);
342  assert(RecordIdx == Vals.size() &&
343  "Blob data and record entries specified for blob operand!");
344  } else {
345  EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
346  }
347 
348  // Flush to a 32-bit alignment boundary.
349  FlushToWord();
350 
351  // Emit each field as a literal byte.
352  if (BlobData) {
353  for (unsigned i = 0; i != BlobLen; ++i)
354  WriteByte((unsigned char)BlobData[i]);
355 
356  // Know that blob data is consumed for assertion below.
357  BlobData = nullptr;
358  } else {
359  for (unsigned e = Vals.size(); RecordIdx != e; ++RecordIdx) {
360  assert(isUInt<8>(Vals[RecordIdx]) &&
361  "Value too large to emit as blob");
362  WriteByte((unsigned char)Vals[RecordIdx]);
363  }
364  }
365 
366  // Align end to 32-bits.
367  while (GetBufferOffset() & 3)
368  WriteByte(0);
369  } else { // Single scalar field.
370  assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
371  EmitAbbreviatedField(Op, Vals[RecordIdx]);
372  ++RecordIdx;
373  }
374  }
375  assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
376  assert(BlobData == nullptr &&
377  "Blob data specified for record that doesn't use it!");
378  }
379 
380 public:
381 
382  /// EmitRecord - Emit the specified record to the stream, using an abbrev if
383  /// we have one to compress the output.
384  template<typename uintty>
386  unsigned Abbrev = 0) {
387  if (!Abbrev) {
388  // If we don't have an abbrev to use, emit this in its fully unabbreviated
389  // form.
391  EmitVBR(Code, 6);
392  EmitVBR(static_cast<uint32_t>(Vals.size()), 6);
393  for (unsigned i = 0, e = static_cast<unsigned>(Vals.size()); i != e; ++i)
394  EmitVBR64(Vals[i], 6);
395  return;
396  }
397 
398  // Insert the code into Vals to treat it uniformly.
399  Vals.insert(Vals.begin(), Code);
400 
401  EmitRecordWithAbbrev(Abbrev, Vals);
402  }
403 
404  /// EmitRecordWithAbbrev - Emit a record with the specified abbreviation.
405  /// Unlike EmitRecord, the code for the record should be included in Vals as
406  /// the first entry.
407  template<typename uintty>
408  void EmitRecordWithAbbrev(unsigned Abbrev, SmallVectorImpl<uintty> &Vals) {
409  EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef());
410  }
411 
412  /// EmitRecordWithBlob - Emit the specified record to the stream, using an
413  /// abbrev that includes a blob at the end. The blob data to emit is
414  /// specified by the pointer and length specified at the end. In contrast to
415  /// EmitRecord, this routine expects that the first entry in Vals is the code
416  /// of the record.
417  template<typename uintty>
418  void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
419  StringRef Blob) {
420  EmitRecordWithAbbrevImpl(Abbrev, Vals, Blob);
421  }
422  template<typename uintty>
423  void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
424  const char *BlobData, unsigned BlobLen) {
425  return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(BlobData, BlobLen));
426  }
427 
428  /// EmitRecordWithArray - Just like EmitRecordWithBlob, works with records
429  /// that end with an array.
430  template<typename uintty>
431  void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
432  StringRef Array) {
433  EmitRecordWithAbbrevImpl(Abbrev, Vals, Array);
434  }
435  template<typename uintty>
436  void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
437  const char *ArrayData, unsigned ArrayLen) {
438  return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(ArrayData,
439  ArrayLen));
440  }
441 
442  //===--------------------------------------------------------------------===//
443  // Abbrev Emission
444  //===--------------------------------------------------------------------===//
445 
446 private:
447  // Emit the abbreviation as a DEFINE_ABBREV record.
448  void EncodeAbbrev(BitCodeAbbrev *Abbv) {
450  EmitVBR(Abbv->getNumOperandInfos(), 5);
451  for (unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
452  i != e; ++i) {
453  const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
454  Emit(Op.isLiteral(), 1);
455  if (Op.isLiteral()) {
456  EmitVBR64(Op.getLiteralValue(), 8);
457  } else {
458  Emit(Op.getEncoding(), 3);
459  if (Op.hasEncodingData())
460  EmitVBR64(Op.getEncodingData(), 5);
461  }
462  }
463  }
464 public:
465 
466  /// EmitAbbrev - This emits an abbreviation to the stream. Note that this
467  /// method takes ownership of the specified abbrev.
468  unsigned EmitAbbrev(BitCodeAbbrev *Abbv) {
469  // Emit the abbreviation as a record.
470  EncodeAbbrev(Abbv);
471  CurAbbrevs.push_back(Abbv);
472  return static_cast<unsigned>(CurAbbrevs.size())-1 +
473  bitc::FIRST_APPLICATION_ABBREV;
474  }
475 
476  //===--------------------------------------------------------------------===//
477  // BlockInfo Block Emission
478  //===--------------------------------------------------------------------===//
479 
480  /// EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
481  void EnterBlockInfoBlock(unsigned CodeWidth) {
483  BlockInfoCurBID = ~0U;
484  }
485 private:
486  /// SwitchToBlockID - If we aren't already talking about the specified block
487  /// ID, emit a BLOCKINFO_CODE_SETBID record.
488  void SwitchToBlockID(unsigned BlockID) {
489  if (BlockInfoCurBID == BlockID) return;
491  V.push_back(BlockID);
493  BlockInfoCurBID = BlockID;
494  }
495 
496  BlockInfo &getOrCreateBlockInfo(unsigned BlockID) {
497  if (BlockInfo *BI = getBlockInfo(BlockID))
498  return *BI;
499 
500  // Otherwise, add a new record.
501  BlockInfoRecords.emplace_back();
502  BlockInfoRecords.back().BlockID = BlockID;
503  return BlockInfoRecords.back();
504  }
505 
506 public:
507 
508  /// EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified
509  /// BlockID.
510  unsigned EmitBlockInfoAbbrev(unsigned BlockID, BitCodeAbbrev *Abbv) {
511  SwitchToBlockID(BlockID);
512  EncodeAbbrev(Abbv);
513 
514  // Add the abbrev to the specified block record.
515  BlockInfo &Info = getOrCreateBlockInfo(BlockID);
516  Info.Abbrevs.push_back(Abbv);
517 
518  return Info.Abbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
519  }
520 };
521 
522 
523 } // End llvm namespace
524 
525 #endif
bool isUInt< 8 >(uint64_t x)
Definition: MathExtras.h:294
void push_back(const T &Elt)
Definition: SmallVector.h:222
void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl< uintty > &Vals, const char *ArrayData, unsigned ArrayLen)
BLOCKINFO_BLOCK is used to define metadata about blocks, for example, standard abbrevs that should be...
Definition: BitCodes.h:62
BitCodeAbbrev - This class represents an abbreviation record.
Definition: BitCodes.h:165
const BitCodeAbbrevOp & getOperandInfo(unsigned N) const
Definition: BitCodes.h:175
void EmitRecord(unsigned Code, SmallVectorImpl< uintty > &Vals, unsigned Abbrev=0)
EmitRecord - Emit the specified record to the stream, using an abbrev if we have one to compress the ...
static unsigned EncodeChar6(char C)
Definition: BitCodes.h:139
uint64_t GetCurrentBitNo() const
Retrieve the current position in the stream, in bits.
void EnterBlockInfoBlock(unsigned CodeWidth)
EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:98
void Emit(uint32_t Val, unsigned NumBits)
uint64_t getEncodingData() const
Definition: BitCodes.h:112
void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl< uintty > &Vals, StringRef Array)
EmitRecordWithArray - Just like EmitRecordWithBlob, works with records that end with an array...
bool isLiteral() const
Definition: BitCodes.h:104
void EnterSubblock(unsigned BlockID, unsigned CodeLen)
bool hasEncodingData() const
Definition: BitCodes.h:117
void EmitCode(unsigned Val)
EmitCode - Emit the specified code.
unsigned EmitAbbrev(BitCodeAbbrev *Abbv)
EmitAbbrev - This emits an abbreviation to the stream.
BitCodeAbbrevOp - This describes one or more operands in an abbreviation.
Definition: BitCodes.h:87
unsigned EmitBlockInfoAbbrev(unsigned BlockID, BitCodeAbbrev *Abbv)
EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified BlockID.
void write32le(void *p, uint32_t v)
Definition: Endian.h:219
void EmitVBR(uint32_t Val, unsigned NumBits)
void append(in_iter in_start, in_iter in_end)
Add the specified range to the end of the SmallVector.
Definition: SmallVector.h:416
uint64_t getLiteralValue() const
Definition: BitCodes.h:108
BlockInfo * getBlockInfo(unsigned BlockID)
getBlockInfo - If there is block info for the specified ID, return it, otherwise return null...
void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl< uintty > &Vals, StringRef Blob)
EmitRecordWithBlob - Emit the specified record to the stream, using an abbrev that includes a blob at...
void EmitRecordWithAbbrev(unsigned Abbrev, SmallVectorImpl< uintty > &Vals)
EmitRecordWithAbbrev - Emit a record with the specified abbreviation.
void Emit64(uint64_t Val, unsigned NumBits)
DEFINE_ABBREV - Defines an abbrev for the current block.
Definition: BitCodes.h:46
iterator insert(iterator I, T &&Elt)
Definition: SmallVector.h:481
BitstreamWriter(SmallVectorImpl< char > &O)
static int const Threshold
TODO: Write a new FunctionPass AliasAnalysis so that it can keep a cache.
unsigned getNumOperandInfos() const
Definition: BitCodes.h:172
void EmitVBR64(uint64_t Val, unsigned NumBits)
LLVM Value Representation.
Definition: Value.h:69
void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl< uintty > &Vals, const char *BlobData, unsigned BlobLen)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40
Encoding getEncoding() const
Definition: BitCodes.h:111