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