tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

   1 //===-- llvm-bcanalyzer.cpp - Bitcode Analyzer --------------------------===//
   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 tool may be invoked in the following manner:
  11 //  llvm-bcanalyzer [options]      - Read LLVM bitcode from stdin
  12 //  llvm-bcanalyzer [options] x.bc - Read LLVM bitcode from the x.bc file
  13 //
  14 //  Options:
  15 //      --help      - Output information about command line switches
  16 //      --dump      - Dump low-level bitcode structure in readable format
  17 //
  18 // This tool provides analytical information about a bitcode file. It is
  19 // intended as an aid to developers of bitcode reading and writing software. It
  20 // produces on std::out a summary of the bitcode file that shows various
  21 // statistics about the contents of the file. By default this information is
  22 // detailed and contains information about individual bitcode blocks and the
  23 // functions in the module.
  24 // The tool is also able to print a bitcode file in a straight forward text
  25 // format that shows the containment and relationships of the information in
  26 // the bitcode file (-dump option).
  27 //
  28 //===----------------------------------------------------------------------===//
  29
  30 #include "llvm/Analysis/Verifier.h"
  31 #include "llvm/Bitcode/BitstreamReader.h"
  32 #include "llvm/Bitcode/LLVMBitCodes.h"
  33 #include "llvm/Bitcode/ReaderWriter.h"
  34 #include "llvm/Support/CommandLine.h"
  35 #include "llvm/Support/ManagedStatic.h"
  36 #include "llvm/Support/MemoryBuffer.h"
  37 #include "llvm/Support/PrettyStackTrace.h"
  38 #include "llvm/Support/raw_ostream.h"
  39 #include "llvm/System/Signals.h"
  40 #include <cstdio>
  41 #include <map>
  42 #include <algorithm>
  43 using namespace llvm;
  44
  45 static cl::opt<std::string>
  46   InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
  47
  48 static cl::opt<std::string>
  49   OutputFilename("-o", cl::init("-"), cl::desc("<output file>"));
  50
  51 static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace"));
  52
  53 //===----------------------------------------------------------------------===//
  54 // Bitcode specific analysis.
  55 //===----------------------------------------------------------------------===//
  56
  57 static cl::opt<bool> NoHistogram("disable-histogram",
  58                                  cl::desc("Do not print per-code histogram"));
  59
  60 static cl::opt<bool>
  61 NonSymbolic("non-symbolic",
  62             cl::desc("Emit numberic info in dump even if"
  63                      " symbolic info is available"));
  64
  65 /// CurStreamType - If we can sniff the flavor of this stream, we can produce
  66 /// better dump info.
  67 static enum {
  68   UnknownBitstream,
  69   LLVMIRBitstream
  70 } CurStreamType;
  71
  72
  73 /// GetBlockName - Return a symbolic block name if known, otherwise return
  74 /// null.
  75 static const char *GetBlockName(unsigned BlockID,
  76                                 const BitstreamReader &StreamFile) {
  77   // Standard blocks for all bitcode files.
  78   if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
  79     if (BlockID == bitc::BLOCKINFO_BLOCK_ID)
  80       return "BLOCKINFO_BLOCK";
  81     return 0;
  82   }
  83
  84   // Check to see if we have a blockinfo record for this block, with a name.
  85   if (const BitstreamReader::BlockInfo *Info =
  86         StreamFile.getBlockInfo(BlockID)) {
  87     if (!Info->Name.empty())
  88       return Info->Name.c_str();
  89   }
  90
  91
  92   if (CurStreamType != LLVMIRBitstream) return 0;
  93
  94   switch (BlockID) {
  95   default:                          return 0;
  96   case bitc::MODULE_BLOCK_ID:       return "MODULE_BLOCK";
  97   case bitc::PARAMATTR_BLOCK_ID:    return "PARAMATTR_BLOCK";
  98   case bitc::TYPE_BLOCK_ID:         return "TYPE_BLOCK";
  99   case bitc::CONSTANTS_BLOCK_ID:    return "CONSTANTS_BLOCK";
 100   case bitc::FUNCTION_BLOCK_ID:     return "FUNCTION_BLOCK";
 101   case bitc::TYPE_SYMTAB_BLOCK_ID:  return "TYPE_SYMTAB";
 102   case bitc::VALUE_SYMTAB_BLOCK_ID: return "VALUE_SYMTAB";
 103   case bitc::METADATA_BLOCK_ID:     return "METADATA_BLOCK";
 104   }
 105 }
 106
 107 /// GetCodeName - Return a symbolic code name if known, otherwise return
 108 /// null.
 109 static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
 110                                const BitstreamReader &StreamFile) {
 111   // Standard blocks for all bitcode files.
 112   if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
 113     if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
 114       switch (CodeID) {
 115       default: return 0;
 116       case bitc::BLOCKINFO_CODE_SETBID:        return "SETBID";
 117       case bitc::BLOCKINFO_CODE_BLOCKNAME:     return "BLOCKNAME";
 118       case bitc::BLOCKINFO_CODE_SETRECORDNAME: return "SETRECORDNAME";
 119       }
 120     }
 121     return 0;
 122   }
 123
 124   // Check to see if we have a blockinfo record for this record, with a name.
 125   if (const BitstreamReader::BlockInfo *Info =
 126         StreamFile.getBlockInfo(BlockID)) {
 127     for (unsigned i = 0, e = Info->RecordNames.size(); i != e; ++i)
 128       if (Info->RecordNames[i].first == CodeID)
 129         return Info->RecordNames[i].second.c_str();
 130   }
 131
 132
 133   if (CurStreamType != LLVMIRBitstream) return 0;
 134
 135   switch (BlockID) {
 136   default: return 0;
 137   case bitc::MODULE_BLOCK_ID:
 138     switch (CodeID) {
 139     default: return 0;
 140     case bitc::MODULE_CODE_VERSION:     return "VERSION";
 141     case bitc::MODULE_CODE_TRIPLE:      return "TRIPLE";
 142     case bitc::MODULE_CODE_DATALAYOUT:  return "DATALAYOUT";
 143     case bitc::MODULE_CODE_ASM:         return "ASM";
 144     case bitc::MODULE_CODE_SECTIONNAME: return "SECTIONNAME";
 145     case bitc::MODULE_CODE_DEPLIB:      return "DEPLIB";
 146     case bitc::MODULE_CODE_GLOBALVAR:   return "GLOBALVAR";
 147     case bitc::MODULE_CODE_FUNCTION:    return "FUNCTION";
 148     case bitc::MODULE_CODE_ALIAS:       return "ALIAS";
 149     case bitc::MODULE_CODE_PURGEVALS:   return "PURGEVALS";
 150     case bitc::MODULE_CODE_GCNAME:      return "GCNAME";
 151     }
 152   case bitc::PARAMATTR_BLOCK_ID:
 153     switch (CodeID) {
 154     default: return 0;
 155     case bitc::PARAMATTR_CODE_ENTRY: return "ENTRY";
 156     }
 157   case bitc::TYPE_BLOCK_ID:
 158     switch (CodeID) {
 159     default: return 0;
 160     case bitc::TYPE_CODE_NUMENTRY:  return "NUMENTRY";
 161     case bitc::TYPE_CODE_VOID:      return "VOID";
 162     case bitc::TYPE_CODE_FLOAT:     return "FLOAT";
 163     case bitc::TYPE_CODE_DOUBLE:    return "DOUBLE";
 164     case bitc::TYPE_CODE_LABEL:     return "LABEL";
 165     case bitc::TYPE_CODE_OPAQUE:    return "OPAQUE";
 166     case bitc::TYPE_CODE_INTEGER:   return "INTEGER";
 167     case bitc::TYPE_CODE_POINTER:   return "POINTER";
 168     case bitc::TYPE_CODE_FUNCTION:  return "FUNCTION";
 169     case bitc::TYPE_CODE_STRUCT:    return "STRUCT";
 170     case bitc::TYPE_CODE_ARRAY:     return "ARRAY";
 171     case bitc::TYPE_CODE_VECTOR:    return "VECTOR";
 172     case bitc::TYPE_CODE_X86_FP80:  return "X86_FP80";
 173     case bitc::TYPE_CODE_FP128:     return "FP128";
 174     case bitc::TYPE_CODE_PPC_FP128: return "PPC_FP128";
 175     case bitc::TYPE_CODE_METADATA:  return "METADATA";
 176     }
 177
 178   case bitc::CONSTANTS_BLOCK_ID:
 179     switch (CodeID) {
 180     default: return 0;
 181     case bitc::CST_CODE_SETTYPE:       return "SETTYPE";
 182     case bitc::CST_CODE_NULL:          return "NULL";
 183     case bitc::CST_CODE_UNDEF:         return "UNDEF";
 184     case bitc::CST_CODE_INTEGER:       return "INTEGER";
 185     case bitc::CST_CODE_WIDE_INTEGER:  return "WIDE_INTEGER";
 186     case bitc::CST_CODE_FLOAT:         return "FLOAT";
 187     case bitc::CST_CODE_AGGREGATE:     return "AGGREGATE";
 188     case bitc::CST_CODE_STRING:        return "STRING";
 189     case bitc::CST_CODE_CSTRING:       return "CSTRING";
 190     case bitc::CST_CODE_CE_BINOP:      return "CE_BINOP";
 191     case bitc::CST_CODE_CE_CAST:       return "CE_CAST";
 192     case bitc::CST_CODE_CE_GEP:        return "CE_GEP";
 193     case bitc::CST_CODE_CE_SELECT:     return "CE_SELECT";
 194     case bitc::CST_CODE_CE_EXTRACTELT: return "CE_EXTRACTELT";
 195     case bitc::CST_CODE_CE_INSERTELT:  return "CE_INSERTELT";
 196     case bitc::CST_CODE_CE_SHUFFLEVEC: return "CE_SHUFFLEVEC";
 197     case bitc::CST_CODE_CE_CMP:        return "CE_CMP";
 198     case bitc::CST_CODE_INLINEASM:     return "INLINEASM";
 199     case bitc::CST_CODE_CE_SHUFVEC_EX: return "CE_SHUFVEC_EX";
 200     }
 201   case bitc::FUNCTION_BLOCK_ID:
 202     switch (CodeID) {
 203     default: return 0;
 204     case bitc::FUNC_CODE_DECLAREBLOCKS: return "DECLAREBLOCKS";
 205
 206     case bitc::FUNC_CODE_INST_BINOP:       return "INST_BINOP";
 207     case bitc::FUNC_CODE_INST_CAST:        return "INST_CAST";
 208     case bitc::FUNC_CODE_INST_GEP:         return "INST_GEP";
 209     case bitc::FUNC_CODE_INST_SELECT:      return "INST_SELECT";
 210     case bitc::FUNC_CODE_INST_EXTRACTELT:  return "INST_EXTRACTELT";
 211     case bitc::FUNC_CODE_INST_INSERTELT:   return "INST_INSERTELT";
 212     case bitc::FUNC_CODE_INST_SHUFFLEVEC:  return "INST_SHUFFLEVEC";
 213     case bitc::FUNC_CODE_INST_CMP:         return "INST_CMP";
 214
 215     case bitc::FUNC_CODE_INST_RET:         return "INST_RET";
 216     case bitc::FUNC_CODE_INST_BR:          return "INST_BR";
 217     case bitc::FUNC_CODE_INST_SWITCH:      return "INST_SWITCH";
 218     case bitc::FUNC_CODE_INST_INVOKE:      return "INST_INVOKE";
 219     case bitc::FUNC_CODE_INST_UNWIND:      return "INST_UNWIND";
 220     case bitc::FUNC_CODE_INST_UNREACHABLE: return "INST_UNREACHABLE";
 221
 222     case bitc::FUNC_CODE_INST_PHI:         return "INST_PHI";
 223     case bitc::FUNC_CODE_INST_MALLOC:      return "INST_MALLOC";
 224     case bitc::FUNC_CODE_INST_FREE:        return "INST_FREE";
 225     case bitc::FUNC_CODE_INST_ALLOCA:      return "INST_ALLOCA";
 226     case bitc::FUNC_CODE_INST_LOAD:        return "INST_LOAD";
 227     case bitc::FUNC_CODE_INST_STORE:       return "INST_STORE";
 228     case bitc::FUNC_CODE_INST_CALL:        return "INST_CALL";
 229     case bitc::FUNC_CODE_INST_VAARG:       return "INST_VAARG";
 230     case bitc::FUNC_CODE_INST_STORE2:      return "INST_STORE2";
 231     case bitc::FUNC_CODE_INST_GETRESULT:   return "INST_GETRESULT";
 232     case bitc::FUNC_CODE_INST_EXTRACTVAL:  return "INST_EXTRACTVAL";
 233     case bitc::FUNC_CODE_INST_INSERTVAL:   return "INST_INSERTVAL";
 234     case bitc::FUNC_CODE_INST_CMP2:        return "INST_CMP2";
 235     case bitc::FUNC_CODE_INST_VSELECT:     return "INST_VSELECT";
 236     }
 237   case bitc::TYPE_SYMTAB_BLOCK_ID:
 238     switch (CodeID) {
 239     default: return 0;
 240     case bitc::TST_CODE_ENTRY: return "ENTRY";
 241     }
 242   case bitc::VALUE_SYMTAB_BLOCK_ID:
 243     switch (CodeID) {
 244     default: return 0;
 245     case bitc::VST_CODE_ENTRY: return "ENTRY";
 246     case bitc::VST_CODE_BBENTRY: return "BBENTRY";
 247     }
 248   case bitc::METADATA_BLOCK_ID:
 249     switch(CodeID) {
 250     default:return 0;
 251     case bitc::METADATA_STRING:      return "MDSTRING";
 252     case bitc::METADATA_NODE:        return "MDNODE";
 253     case bitc::METADATA_NAME:        return "METADATA_NAME";
 254     case bitc::METADATA_NAMED_NODE:  return "NAMEDMDNODE";
 255     }
 256   }
 257 }
 258
 259 struct PerRecordStats {
 260   unsigned NumInstances;
 261   unsigned NumAbbrev;
 262   uint64_t TotalBits;
 263
 264   PerRecordStats() : NumInstances(0), NumAbbrev(0), TotalBits(0) {}
 265 };
 266
 267 struct PerBlockIDStats {
 268   /// NumInstances - This the number of times this block ID has been seen.
 269   unsigned NumInstances;
 270
 271   /// NumBits - The total size in bits of all of these blocks.
 272   uint64_t NumBits;
 273
 274   /// NumSubBlocks - The total number of blocks these blocks contain.
 275   unsigned NumSubBlocks;
 276
 277   /// NumAbbrevs - The total number of abbreviations.
 278   unsigned NumAbbrevs;
 279
 280   /// NumRecords - The total number of records these blocks contain, and the
 281   /// number that are abbreviated.
 282   unsigned NumRecords, NumAbbreviatedRecords;
 283
 284   /// CodeFreq - Keep track of the number of times we see each code.
 285   std::vector<PerRecordStats> CodeFreq;
 286
 287   PerBlockIDStats()
 288     : NumInstances(0), NumBits(0),
 289       NumSubBlocks(0), NumAbbrevs(0), NumRecords(0), NumAbbreviatedRecords(0) {}
 290 };
 291
 292 static std::map<unsigned, PerBlockIDStats> BlockIDStats;
 293
 294
 295
 296 /// Error - All bitcode analysis errors go through this function, making this a
 297 /// good place to breakpoint if debugging.
 298 static bool Error(const std::string &Err) {
 299   errs() << Err << "\n";
 300   return true;
 301 }
 302
 303 /// ParseBlock - Read a block, updating statistics, etc.
 304 static bool ParseBlock(BitstreamCursor &Stream, unsigned IndentLevel) {
 305   std::string Indent(IndentLevel*2, ' ');
 306   uint64_t BlockBitStart = Stream.GetCurrentBitNo();
 307   unsigned BlockID = Stream.ReadSubBlockID();
 308
 309   // Get the statistics for this BlockID.
 310   PerBlockIDStats &BlockStats = BlockIDStats[BlockID];
 311
 312   BlockStats.NumInstances++;
 313
 314   // BLOCKINFO is a special part of the stream.
 315   if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
 316     if (Dump) errs() << Indent << "<BLOCKINFO_BLOCK/>\n";
 317     if (Stream.ReadBlockInfoBlock())
 318       return Error("Malformed BlockInfoBlock");
 319     uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
 320     BlockStats.NumBits += BlockBitEnd-BlockBitStart;
 321     return false;
 322   }
 323
 324   unsigned NumWords = 0;
 325   if (Stream.EnterSubBlock(BlockID, &NumWords))
 326     return Error("Malformed block record");
 327
 328   const char *BlockName = 0;
 329   if (Dump) {
 330     errs() << Indent << "<";
 331     if ((BlockName = GetBlockName(BlockID, *Stream.getBitStreamReader())))
 332       errs() << BlockName;
 333     else
 334       errs() << "UnknownBlock" << BlockID;
 335
 336     if (NonSymbolic && BlockName)
 337       errs() << " BlockID=" << BlockID;
 338
 339     errs() << " NumWords=" << NumWords
 340            << " BlockCodeSize=" << Stream.GetAbbrevIDWidth() << ">\n";
 341   }
 342
 343   SmallVector<uint64_t, 64> Record;
 344
 345   // Read all the records for this block.
 346   while (1) {
 347     if (Stream.AtEndOfStream())
 348       return Error("Premature end of bitstream");
 349
 350     uint64_t RecordStartBit = Stream.GetCurrentBitNo();
 351
 352     // Read the code for this record.
 353     unsigned AbbrevID = Stream.ReadCode();
 354     switch (AbbrevID) {
 355     case bitc::END_BLOCK: {
 356       if (Stream.ReadBlockEnd())
 357         return Error("Error at end of block");
 358       uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
 359       BlockStats.NumBits += BlockBitEnd-BlockBitStart;
 360       if (Dump) {
 361         errs() << Indent << "</";
 362         if (BlockName)
 363           errs() << BlockName << ">\n";
 364         else
 365           errs() << "UnknownBlock" << BlockID << ">\n";
 366       }
 367       return false;
 368     }
 369     case bitc::ENTER_SUBBLOCK: {
 370       uint64_t SubBlockBitStart = Stream.GetCurrentBitNo();
 371       if (ParseBlock(Stream, IndentLevel+1))
 372         return true;
 373       ++BlockStats.NumSubBlocks;
 374       uint64_t SubBlockBitEnd = Stream.GetCurrentBitNo();
 375
 376       // Don't include subblock sizes in the size of this block.
 377       BlockBitStart += SubBlockBitEnd-SubBlockBitStart;
 378       break;
 379     }
 380     case bitc::DEFINE_ABBREV:
 381       Stream.ReadAbbrevRecord();
 382       ++BlockStats.NumAbbrevs;
 383       break;
 384     default:
 385       Record.clear();
 386
 387       ++BlockStats.NumRecords;
 388       if (AbbrevID != bitc::UNABBREV_RECORD)
 389         ++BlockStats.NumAbbreviatedRecords;
 390
 391       const char *BlobStart = 0;
 392       unsigned BlobLen = 0;
 393       unsigned Code = Stream.ReadRecord(AbbrevID, Record, BlobStart, BlobLen);
 394
 395
 396
 397       // Increment the # occurrences of this code.
 398       if (BlockStats.CodeFreq.size() <= Code)
 399         BlockStats.CodeFreq.resize(Code+1);
 400       BlockStats.CodeFreq[Code].NumInstances++;
 401       BlockStats.CodeFreq[Code].TotalBits +=
 402         Stream.GetCurrentBitNo()-RecordStartBit;
 403       if (AbbrevID != bitc::UNABBREV_RECORD)
 404         BlockStats.CodeFreq[Code].NumAbbrev++;
 405
 406       if (Dump) {
 407         errs() << Indent << "  <";
 408         if (const char *CodeName =
 409               GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
 410           errs() << CodeName;
 411         else
 412           errs() << "UnknownCode" << Code;
 413         if (NonSymbolic &&
 414             GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
 415           errs() << " codeid=" << Code;
 416         if (AbbrevID != bitc::UNABBREV_RECORD)
 417           errs() << " abbrevid=" << AbbrevID;
 418
 419         for (unsigned i = 0, e = Record.size(); i != e; ++i)
 420           errs() << " op" << i << "=" << (int64_t)Record[i];
 421
 422         errs() << "/>";
 423
 424         if (BlobStart) {
 425           errs() << " blob data = ";
 426           bool BlobIsPrintable = true;
 427           for (unsigned i = 0; i != BlobLen; ++i)
 428             if (!isprint(BlobStart[i])) {
 429               BlobIsPrintable = false;
 430               break;
 431             }
 432
 433           if (BlobIsPrintable)
 434             errs() << "'" << std::string(BlobStart, BlobStart+BlobLen) <<"'";
 435           else
 436             errs() << "unprintable, " << BlobLen << " bytes.";
 437         }
 438
 439         errs() << "\n";
 440       }
 441
 442       break;
 443     }
 444   }
 445 }
 446
 447 static void PrintSize(double Bits) {
 448   fprintf(stderr, "%.2f/%.2fB/%lluW", Bits, Bits/8,(unsigned long long)Bits/32);
 449 }
 450 static void PrintSize(uint64_t Bits) {
 451   fprintf(stderr, "%llub/%.2fB/%lluW", (unsigned long long)Bits,
 452           (double)Bits/8, (unsigned long long)Bits/32);
 453 }
 454
 455
 456 /// AnalyzeBitcode - Analyze the bitcode file specified by InputFilename.
 457 static int AnalyzeBitcode() {
 458   // Read the input file.
 459   MemoryBuffer *MemBuf = MemoryBuffer::getFileOrSTDIN(InputFilename.c_str());
 460
 461   if (MemBuf == 0)
 462     return Error("Error reading '" + InputFilename + "'.");
 463
 464   if (MemBuf->getBufferSize() & 3)
 465     return Error("Bitcode stream should be a multiple of 4 bytes in length");
 466
 467   unsigned char *BufPtr = (unsigned char *)MemBuf->getBufferStart();
 468   unsigned char *EndBufPtr = BufPtr+MemBuf->getBufferSize();
 469
 470   // If we have a wrapper header, parse it and ignore the non-bc file contents.
 471   // The magic number is 0x0B17C0DE stored in little endian.
 472   if (isBitcodeWrapper(BufPtr, EndBufPtr))
 473     if (SkipBitcodeWrapperHeader(BufPtr, EndBufPtr))
 474       return Error("Invalid bitcode wrapper header");
 475
 476   BitstreamReader StreamFile(BufPtr, EndBufPtr);
 477   BitstreamCursor Stream(StreamFile);
 478   StreamFile.CollectBlockInfoNames();
 479
 480   // Read the stream signature.
 481   char Signature[6];
 482   Signature[0] = Stream.Read(8);
 483   Signature[1] = Stream.Read(8);
 484   Signature[2] = Stream.Read(4);
 485   Signature[3] = Stream.Read(4);
 486   Signature[4] = Stream.Read(4);
 487   Signature[5] = Stream.Read(4);
 488
 489   // Autodetect the file contents, if it is one we know.
 490   CurStreamType = UnknownBitstream;
 491   if (Signature[0] == 'B' && Signature[1] == 'C' &&
 492       Signature[2] == 0x0 && Signature[3] == 0xC &&
 493       Signature[4] == 0xE && Signature[5] == 0xD)
 494     CurStreamType = LLVMIRBitstream;
 495
 496   unsigned NumTopBlocks = 0;
 497
 498   // Parse the top-level structure.  We only allow blocks at the top-level.
 499   while (!Stream.AtEndOfStream()) {
 500     unsigned Code = Stream.ReadCode();
 501     if (Code != bitc::ENTER_SUBBLOCK)
 502       return Error("Invalid record at top-level");
 503
 504     if (ParseBlock(Stream, 0))
 505       return true;
 506     ++NumTopBlocks;
 507   }
 508
 509   if (Dump) errs() << "\n\n";
 510
 511   uint64_t BufferSizeBits = (EndBufPtr-BufPtr)*CHAR_BIT;
 512   // Print a summary of the read file.
 513   errs() << "Summary of " << InputFilename << ":\n";
 514   errs() << "         Total size: ";
 515   PrintSize(BufferSizeBits);
 516   errs() << "\n";
 517   errs() << "        Stream type: ";
 518   switch (CurStreamType) {
 519   default: assert(0 && "Unknown bitstream type");
 520   case UnknownBitstream: errs() << "unknown\n"; break;
 521   case LLVMIRBitstream:  errs() << "LLVM IR\n"; break;
 522   }
 523   errs() << "  # Toplevel Blocks: " << NumTopBlocks << "\n";
 524   errs() << "\n";
 525
 526   // Emit per-block stats.
 527   errs() << "Per-block Summary:\n";
 528   for (std::map<unsigned, PerBlockIDStats>::iterator I = BlockIDStats.begin(),
 529        E = BlockIDStats.end(); I != E; ++I) {
 530     errs() << "  Block ID #" << I->first;
 531     if (const char *BlockName = GetBlockName(I->first, StreamFile))
 532       errs() << " (" << BlockName << ")";
 533     errs() << ":\n";
 534
 535     const PerBlockIDStats &Stats = I->second;
 536     errs() << "      Num Instances: " << Stats.NumInstances << "\n";
 537     errs() << "         Total Size: ";
 538     PrintSize(Stats.NumBits);
 539     errs() << "\n";
 540     errs() << "          % of file: "
 541            << Stats.NumBits/(double)BufferSizeBits*100 << "\n";
 542     if (Stats.NumInstances > 1) {
 543       errs() << "       Average Size: ";
 544       PrintSize(Stats.NumBits/(double)Stats.NumInstances);
 545       errs() << "\n";
 546       errs() << "  Tot/Avg SubBlocks: " << Stats.NumSubBlocks << "/"
 547              << Stats.NumSubBlocks/(double)Stats.NumInstances << "\n";
 548       errs() << "    Tot/Avg Abbrevs: " << Stats.NumAbbrevs << "/"
 549              << Stats.NumAbbrevs/(double)Stats.NumInstances << "\n";
 550       errs() << "    Tot/Avg Records: " << Stats.NumRecords << "/"
 551              << Stats.NumRecords/(double)Stats.NumInstances << "\n";
 552     } else {
 553       errs() << "      Num SubBlocks: " << Stats.NumSubBlocks << "\n";
 554       errs() << "        Num Abbrevs: " << Stats.NumAbbrevs << "\n";
 555       errs() << "        Num Records: " << Stats.NumRecords << "\n";
 556     }
 557     if (Stats.NumRecords)
 558       errs() << "      % Abbrev Recs: " << (Stats.NumAbbreviatedRecords/
 559                 (double)Stats.NumRecords)*100 << "\n";
 560     errs() << "\n";
 561
 562     // Print a histogram of the codes we see.
 563     if (!NoHistogram && !Stats.CodeFreq.empty()) {
 564       std::vector<std::pair<unsigned, unsigned> > FreqPairs;  // <freq,code>
 565       for (unsigned i = 0, e = Stats.CodeFreq.size(); i != e; ++i)
 566         if (unsigned Freq = Stats.CodeFreq[i].NumInstances)
 567           FreqPairs.push_back(std::make_pair(Freq, i));
 568       std::stable_sort(FreqPairs.begin(), FreqPairs.end());
 569       std::reverse(FreqPairs.begin(), FreqPairs.end());
 570
 571       errs() << "\tRecord Histogram:\n";
 572       fprintf(stderr, "\t\t  Count    # Bits   %% Abv  Record Kind\n");
 573       for (unsigned i = 0, e = FreqPairs.size(); i != e; ++i) {
 574         const PerRecordStats &RecStats = Stats.CodeFreq[FreqPairs[i].second];
 575
 576         fprintf(stderr, "\t\t%7d %9llu ", RecStats.NumInstances,
 577                 (unsigned long long)RecStats.TotalBits);
 578
 579         if (RecStats.NumAbbrev)
 580           fprintf(stderr, "%7.2f  ",
 581                   (double)RecStats.NumAbbrev/RecStats.NumInstances*100);
 582         else
 583           fprintf(stderr, "         ");
 584
 585         if (const char *CodeName =
 586               GetCodeName(FreqPairs[i].second, I->first, StreamFile))
 587           fprintf(stderr, "%s\n", CodeName);
 588         else
 589           fprintf(stderr, "UnknownCode%d\n", FreqPairs[i].second);
 590       }
 591       errs() << "\n";
 592
 593     }
 594   }
 595   return 0;
 596 }
 597
 598
 599 int main(int argc, char **argv) {
 600   // Print a stack trace if we signal out.
 601   sys::PrintStackTraceOnErrorSignal();
 602   PrettyStackTraceProgram X(argc, argv);
 603   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 604   cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n");
 605
 606   return AnalyzeBitcode();
 607 }