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/ADT/OwningPtr.h"
31 #include "llvm/Analysis/Verifier.h"
32 #include "llvm/Bitcode/BitstreamReader.h"
33 #include "llvm/Bitcode/LLVMBitCodes.h"
34 #include "llvm/Bitcode/ReaderWriter.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Format.h"
37 #include "llvm/Support/ManagedStatic.h"
38 #include "llvm/Support/MemoryBuffer.h"
39 #include "llvm/Support/PrettyStackTrace.h"
40 #include "llvm/Support/raw_ostream.h"
41 #include "llvm/Support/Signals.h"
42 #include "llvm/Support/system_error.h"
43 #include <cstdio>
44 #include <map>
45 #include <algorithm>
46 using namespace llvm;
47
48 static cl::opt<std::string>
49 InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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 numeric info in dump even if"
63 " symbolic info is available"));
64
65 namespace {
66
67 /// CurStreamTypeType - A type for CurStreamType
68 enum CurStreamTypeType {
69 UnknownBitstream,
70 LLVMIRBitstream
71 };
72
73 }
74
75 /// CurStreamType - If we can sniff the flavor of this stream, we can produce
76 /// better dump info.
77 static CurStreamTypeType CurStreamType;
78
79
80 /// GetBlockName - Return a symbolic block name if known, otherwise return
81 /// null.
GetBlockName(unsigned BlockID,const BitstreamReader & StreamFile)82 static const char *GetBlockName(unsigned BlockID,
83 const BitstreamReader &StreamFile) {
84 // Standard blocks for all bitcode files.
85 if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
86 if (BlockID == bitc::BLOCKINFO_BLOCK_ID)
87 return "BLOCKINFO_BLOCK";
88 return 0;
89 }
90
91 // Check to see if we have a blockinfo record for this block, with a name.
92 if (const BitstreamReader::BlockInfo *Info =
93 StreamFile.getBlockInfo(BlockID)) {
94 if (!Info->Name.empty())
95 return Info->Name.c_str();
96 }
97
98
99 if (CurStreamType != LLVMIRBitstream) return 0;
100
101 switch (BlockID) {
102 default: return 0;
103 case bitc::MODULE_BLOCK_ID: return "MODULE_BLOCK";
104 case bitc::PARAMATTR_BLOCK_ID: return "PARAMATTR_BLOCK";
105 case bitc::TYPE_BLOCK_ID_OLD: return "TYPE_BLOCK_ID_OLD";
106 case bitc::TYPE_BLOCK_ID_NEW: return "TYPE_BLOCK_ID";
107 case bitc::CONSTANTS_BLOCK_ID: return "CONSTANTS_BLOCK";
108 case bitc::FUNCTION_BLOCK_ID: return "FUNCTION_BLOCK";
109 case bitc::TYPE_SYMTAB_BLOCK_ID_OLD: return "TYPE_SYMTAB_OLD";
110 case bitc::VALUE_SYMTAB_BLOCK_ID: return "VALUE_SYMTAB";
111 case bitc::METADATA_BLOCK_ID: return "METADATA_BLOCK";
112 case bitc::METADATA_ATTACHMENT_ID: return "METADATA_ATTACHMENT_BLOCK";
113 }
114 }
115
116 /// GetCodeName - Return a symbolic code name if known, otherwise return
117 /// null.
GetCodeName(unsigned CodeID,unsigned BlockID,const BitstreamReader & StreamFile)118 static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
119 const BitstreamReader &StreamFile) {
120 // Standard blocks for all bitcode files.
121 if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
122 if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
123 switch (CodeID) {
124 default: return 0;
125 case bitc::BLOCKINFO_CODE_SETBID: return "SETBID";
126 case bitc::BLOCKINFO_CODE_BLOCKNAME: return "BLOCKNAME";
127 case bitc::BLOCKINFO_CODE_SETRECORDNAME: return "SETRECORDNAME";
128 }
129 }
130 return 0;
131 }
132
133 // Check to see if we have a blockinfo record for this record, with a name.
134 if (const BitstreamReader::BlockInfo *Info =
135 StreamFile.getBlockInfo(BlockID)) {
136 for (unsigned i = 0, e = Info->RecordNames.size(); i != e; ++i)
137 if (Info->RecordNames[i].first == CodeID)
138 return Info->RecordNames[i].second.c_str();
139 }
140
141
142 if (CurStreamType != LLVMIRBitstream) return 0;
143
144 switch (BlockID) {
145 default: return 0;
146 case bitc::MODULE_BLOCK_ID:
147 switch (CodeID) {
148 default: return 0;
149 case bitc::MODULE_CODE_VERSION: return "VERSION";
150 case bitc::MODULE_CODE_TRIPLE: return "TRIPLE";
151 case bitc::MODULE_CODE_DATALAYOUT: return "DATALAYOUT";
152 case bitc::MODULE_CODE_ASM: return "ASM";
153 case bitc::MODULE_CODE_SECTIONNAME: return "SECTIONNAME";
154 case bitc::MODULE_CODE_DEPLIB: return "DEPLIB";
155 case bitc::MODULE_CODE_GLOBALVAR: return "GLOBALVAR";
156 case bitc::MODULE_CODE_FUNCTION: return "FUNCTION";
157 case bitc::MODULE_CODE_ALIAS: return "ALIAS";
158 case bitc::MODULE_CODE_PURGEVALS: return "PURGEVALS";
159 case bitc::MODULE_CODE_GCNAME: return "GCNAME";
160 }
161 case bitc::PARAMATTR_BLOCK_ID:
162 switch (CodeID) {
163 default: return 0;
164 case bitc::PARAMATTR_CODE_ENTRY: return "ENTRY";
165 }
166 case bitc::TYPE_BLOCK_ID_OLD:
167 case bitc::TYPE_BLOCK_ID_NEW:
168 switch (CodeID) {
169 default: return 0;
170 case bitc::TYPE_CODE_NUMENTRY: return "NUMENTRY";
171 case bitc::TYPE_CODE_VOID: return "VOID";
172 case bitc::TYPE_CODE_FLOAT: return "FLOAT";
173 case bitc::TYPE_CODE_DOUBLE: return "DOUBLE";
174 case bitc::TYPE_CODE_LABEL: return "LABEL";
175 case bitc::TYPE_CODE_OPAQUE: return "OPAQUE";
176 case bitc::TYPE_CODE_INTEGER: return "INTEGER";
177 case bitc::TYPE_CODE_POINTER: return "POINTER";
178 case bitc::TYPE_CODE_FUNCTION: return "FUNCTION";
179 case bitc::TYPE_CODE_STRUCT_OLD: return "STRUCT_OLD";
180 case bitc::TYPE_CODE_ARRAY: return "ARRAY";
181 case bitc::TYPE_CODE_VECTOR: return "VECTOR";
182 case bitc::TYPE_CODE_X86_FP80: return "X86_FP80";
183 case bitc::TYPE_CODE_FP128: return "FP128";
184 case bitc::TYPE_CODE_PPC_FP128: return "PPC_FP128";
185 case bitc::TYPE_CODE_METADATA: return "METADATA";
186 case bitc::TYPE_CODE_STRUCT_ANON: return "STRUCT_ANON";
187 case bitc::TYPE_CODE_STRUCT_NAME: return "STRUCT_NAME";
188 case bitc::TYPE_CODE_STRUCT_NAMED: return "STRUCT_NAMED";
189 }
190
191 case bitc::CONSTANTS_BLOCK_ID:
192 switch (CodeID) {
193 default: return 0;
194 case bitc::CST_CODE_SETTYPE: return "SETTYPE";
195 case bitc::CST_CODE_NULL: return "NULL";
196 case bitc::CST_CODE_UNDEF: return "UNDEF";
197 case bitc::CST_CODE_INTEGER: return "INTEGER";
198 case bitc::CST_CODE_WIDE_INTEGER: return "WIDE_INTEGER";
199 case bitc::CST_CODE_FLOAT: return "FLOAT";
200 case bitc::CST_CODE_AGGREGATE: return "AGGREGATE";
201 case bitc::CST_CODE_STRING: return "STRING";
202 case bitc::CST_CODE_CSTRING: return "CSTRING";
203 case bitc::CST_CODE_CE_BINOP: return "CE_BINOP";
204 case bitc::CST_CODE_CE_CAST: return "CE_CAST";
205 case bitc::CST_CODE_CE_GEP: return "CE_GEP";
206 case bitc::CST_CODE_CE_INBOUNDS_GEP: return "CE_INBOUNDS_GEP";
207 case bitc::CST_CODE_CE_SELECT: return "CE_SELECT";
208 case bitc::CST_CODE_CE_EXTRACTELT: return "CE_EXTRACTELT";
209 case bitc::CST_CODE_CE_INSERTELT: return "CE_INSERTELT";
210 case bitc::CST_CODE_CE_SHUFFLEVEC: return "CE_SHUFFLEVEC";
211 case bitc::CST_CODE_CE_CMP: return "CE_CMP";
212 case bitc::CST_CODE_INLINEASM: return "INLINEASM";
213 case bitc::CST_CODE_CE_SHUFVEC_EX: return "CE_SHUFVEC_EX";
214 }
215 case bitc::FUNCTION_BLOCK_ID:
216 switch (CodeID) {
217 default: return 0;
218 case bitc::FUNC_CODE_DECLAREBLOCKS: return "DECLAREBLOCKS";
219
220 case bitc::FUNC_CODE_INST_BINOP: return "INST_BINOP";
221 case bitc::FUNC_CODE_INST_CAST: return "INST_CAST";
222 case bitc::FUNC_CODE_INST_GEP: return "INST_GEP";
223 case bitc::FUNC_CODE_INST_INBOUNDS_GEP: return "INST_INBOUNDS_GEP";
224 case bitc::FUNC_CODE_INST_SELECT: return "INST_SELECT";
225 case bitc::FUNC_CODE_INST_EXTRACTELT: return "INST_EXTRACTELT";
226 case bitc::FUNC_CODE_INST_INSERTELT: return "INST_INSERTELT";
227 case bitc::FUNC_CODE_INST_SHUFFLEVEC: return "INST_SHUFFLEVEC";
228 case bitc::FUNC_CODE_INST_CMP: return "INST_CMP";
229
230 case bitc::FUNC_CODE_INST_RET: return "INST_RET";
231 case bitc::FUNC_CODE_INST_BR: return "INST_BR";
232 case bitc::FUNC_CODE_INST_SWITCH: return "INST_SWITCH";
233 case bitc::FUNC_CODE_INST_INVOKE: return "INST_INVOKE";
234 case bitc::FUNC_CODE_INST_UNWIND: return "INST_UNWIND";
235 case bitc::FUNC_CODE_INST_UNREACHABLE: return "INST_UNREACHABLE";
236
237 case bitc::FUNC_CODE_INST_PHI: return "INST_PHI";
238 case bitc::FUNC_CODE_INST_ALLOCA: return "INST_ALLOCA";
239 case bitc::FUNC_CODE_INST_LOAD: return "INST_LOAD";
240 case bitc::FUNC_CODE_INST_VAARG: return "INST_VAARG";
241 case bitc::FUNC_CODE_INST_STORE: return "INST_STORE";
242 case bitc::FUNC_CODE_INST_EXTRACTVAL: return "INST_EXTRACTVAL";
243 case bitc::FUNC_CODE_INST_INSERTVAL: return "INST_INSERTVAL";
244 case bitc::FUNC_CODE_INST_CMP2: return "INST_CMP2";
245 case bitc::FUNC_CODE_INST_VSELECT: return "INST_VSELECT";
246 case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: return "DEBUG_LOC_AGAIN";
247 case bitc::FUNC_CODE_INST_CALL: return "INST_CALL";
248 case bitc::FUNC_CODE_DEBUG_LOC: return "DEBUG_LOC";
249 }
250 case bitc::TYPE_SYMTAB_BLOCK_ID_OLD:
251 switch (CodeID) {
252 default: return 0;
253 case bitc::TST_CODE_ENTRY: return "ENTRY";
254 }
255 case bitc::VALUE_SYMTAB_BLOCK_ID:
256 switch (CodeID) {
257 default: return 0;
258 case bitc::VST_CODE_ENTRY: return "ENTRY";
259 case bitc::VST_CODE_BBENTRY: return "BBENTRY";
260 }
261 case bitc::METADATA_ATTACHMENT_ID:
262 switch(CodeID) {
263 default:return 0;
264 case bitc::METADATA_ATTACHMENT: return "METADATA_ATTACHMENT";
265 }
266 case bitc::METADATA_BLOCK_ID:
267 switch(CodeID) {
268 default:return 0;
269 case bitc::METADATA_STRING: return "METADATA_STRING";
270 case bitc::METADATA_NAME: return "METADATA_NAME";
271 case bitc::METADATA_KIND: return "METADATA_KIND";
272 case bitc::METADATA_NODE: return "METADATA_NODE";
273 case bitc::METADATA_FN_NODE: return "METADATA_FN_NODE";
274 case bitc::METADATA_NAMED_NODE: return "METADATA_NAMED_NODE";
275 }
276 }
277 }
278
279 struct PerRecordStats {
280 unsigned NumInstances;
281 unsigned NumAbbrev;
282 uint64_t TotalBits;
283
PerRecordStatsPerRecordStats284 PerRecordStats() : NumInstances(0), NumAbbrev(0), TotalBits(0) {}
285 };
286
287 struct PerBlockIDStats {
288 /// NumInstances - This the number of times this block ID has been seen.
289 unsigned NumInstances;
290
291 /// NumBits - The total size in bits of all of these blocks.
292 uint64_t NumBits;
293
294 /// NumSubBlocks - The total number of blocks these blocks contain.
295 unsigned NumSubBlocks;
296
297 /// NumAbbrevs - The total number of abbreviations.
298 unsigned NumAbbrevs;
299
300 /// NumRecords - The total number of records these blocks contain, and the
301 /// number that are abbreviated.
302 unsigned NumRecords, NumAbbreviatedRecords;
303
304 /// CodeFreq - Keep track of the number of times we see each code.
305 std::vector<PerRecordStats> CodeFreq;
306
PerBlockIDStatsPerBlockIDStats307 PerBlockIDStats()
308 : NumInstances(0), NumBits(0),
309 NumSubBlocks(0), NumAbbrevs(0), NumRecords(0), NumAbbreviatedRecords(0) {}
310 };
311
312 static std::map<unsigned, PerBlockIDStats> BlockIDStats;
313
314
315
316 /// Error - All bitcode analysis errors go through this function, making this a
317 /// good place to breakpoint if debugging.
Error(const std::string & Err)318 static bool Error(const std::string &Err) {
319 errs() << Err << "\n";
320 return true;
321 }
322
323 /// ParseBlock - Read a block, updating statistics, etc.
ParseBlock(BitstreamCursor & Stream,unsigned IndentLevel)324 static bool ParseBlock(BitstreamCursor &Stream, unsigned IndentLevel) {
325 std::string Indent(IndentLevel*2, ' ');
326 uint64_t BlockBitStart = Stream.GetCurrentBitNo();
327 unsigned BlockID = Stream.ReadSubBlockID();
328
329 // Get the statistics for this BlockID.
330 PerBlockIDStats &BlockStats = BlockIDStats[BlockID];
331
332 BlockStats.NumInstances++;
333
334 // BLOCKINFO is a special part of the stream.
335 if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
336 if (Dump) errs() << Indent << "<BLOCKINFO_BLOCK/>\n";
337 if (Stream.ReadBlockInfoBlock())
338 return Error("Malformed BlockInfoBlock");
339 uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
340 BlockStats.NumBits += BlockBitEnd-BlockBitStart;
341 return false;
342 }
343
344 unsigned NumWords = 0;
345 if (Stream.EnterSubBlock(BlockID, &NumWords))
346 return Error("Malformed block record");
347
348 const char *BlockName = 0;
349 if (Dump) {
350 errs() << Indent << "<";
351 if ((BlockName = GetBlockName(BlockID, *Stream.getBitStreamReader())))
352 errs() << BlockName;
353 else
354 errs() << "UnknownBlock" << BlockID;
355
356 if (NonSymbolic && BlockName)
357 errs() << " BlockID=" << BlockID;
358
359 errs() << " NumWords=" << NumWords
360 << " BlockCodeSize=" << Stream.GetAbbrevIDWidth() << ">\n";
361 }
362
363 SmallVector<uint64_t, 64> Record;
364
365 // Read all the records for this block.
366 while (1) {
367 if (Stream.AtEndOfStream())
368 return Error("Premature end of bitstream");
369
370 uint64_t RecordStartBit = Stream.GetCurrentBitNo();
371
372 // Read the code for this record.
373 unsigned AbbrevID = Stream.ReadCode();
374 switch (AbbrevID) {
375 case bitc::END_BLOCK: {
376 if (Stream.ReadBlockEnd())
377 return Error("Error at end of block");
378 uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
379 BlockStats.NumBits += BlockBitEnd-BlockBitStart;
380 if (Dump) {
381 errs() << Indent << "</";
382 if (BlockName)
383 errs() << BlockName << ">\n";
384 else
385 errs() << "UnknownBlock" << BlockID << ">\n";
386 }
387 return false;
388 }
389 case bitc::ENTER_SUBBLOCK: {
390 uint64_t SubBlockBitStart = Stream.GetCurrentBitNo();
391 if (ParseBlock(Stream, IndentLevel+1))
392 return true;
393 ++BlockStats.NumSubBlocks;
394 uint64_t SubBlockBitEnd = Stream.GetCurrentBitNo();
395
396 // Don't include subblock sizes in the size of this block.
397 BlockBitStart += SubBlockBitEnd-SubBlockBitStart;
398 break;
399 }
400 case bitc::DEFINE_ABBREV:
401 Stream.ReadAbbrevRecord();
402 ++BlockStats.NumAbbrevs;
403 break;
404 default:
405 Record.clear();
406
407 ++BlockStats.NumRecords;
408 if (AbbrevID != bitc::UNABBREV_RECORD)
409 ++BlockStats.NumAbbreviatedRecords;
410
411 const char *BlobStart = 0;
412 unsigned BlobLen = 0;
413 unsigned Code = Stream.ReadRecord(AbbrevID, Record, BlobStart, BlobLen);
414
415
416
417 // Increment the # occurrences of this code.
418 if (BlockStats.CodeFreq.size() <= Code)
419 BlockStats.CodeFreq.resize(Code+1);
420 BlockStats.CodeFreq[Code].NumInstances++;
421 BlockStats.CodeFreq[Code].TotalBits +=
422 Stream.GetCurrentBitNo()-RecordStartBit;
423 if (AbbrevID != bitc::UNABBREV_RECORD)
424 BlockStats.CodeFreq[Code].NumAbbrev++;
425
426 if (Dump) {
427 errs() << Indent << " <";
428 if (const char *CodeName =
429 GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
430 errs() << CodeName;
431 else
432 errs() << "UnknownCode" << Code;
433 if (NonSymbolic &&
434 GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
435 errs() << " codeid=" << Code;
436 if (AbbrevID != bitc::UNABBREV_RECORD)
437 errs() << " abbrevid=" << AbbrevID;
438
439 for (unsigned i = 0, e = Record.size(); i != e; ++i)
440 errs() << " op" << i << "=" << (int64_t)Record[i];
441
442 errs() << "/>";
443
444 if (BlobStart) {
445 errs() << " blob data = ";
446 bool BlobIsPrintable = true;
447 for (unsigned i = 0; i != BlobLen; ++i)
448 if (!isprint(BlobStart[i])) {
449 BlobIsPrintable = false;
450 break;
451 }
452
453 if (BlobIsPrintable)
454 errs() << "'" << std::string(BlobStart, BlobStart+BlobLen) <<"'";
455 else
456 errs() << "unprintable, " << BlobLen << " bytes.";
457 }
458
459 errs() << "\n";
460 }
461
462 break;
463 }
464 }
465 }
466
PrintSize(double Bits)467 static void PrintSize(double Bits) {
468 fprintf(stderr, "%.2f/%.2fB/%luW", Bits, Bits/8,(unsigned long)(Bits/32));
469 }
PrintSize(uint64_t Bits)470 static void PrintSize(uint64_t Bits) {
471 fprintf(stderr, "%lub/%.2fB/%luW", (unsigned long)Bits,
472 (double)Bits/8, (unsigned long)(Bits/32));
473 }
474
475
476 /// AnalyzeBitcode - Analyze the bitcode file specified by InputFilename.
AnalyzeBitcode()477 static int AnalyzeBitcode() {
478 // Read the input file.
479 OwningPtr<MemoryBuffer> MemBuf;
480
481 if (error_code ec =
482 MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), MemBuf))
483 return Error("Error reading '" + InputFilename + "': " + ec.message());
484
485 if (MemBuf->getBufferSize() & 3)
486 return Error("Bitcode stream should be a multiple of 4 bytes in length");
487
488 unsigned char *BufPtr = (unsigned char *)MemBuf->getBufferStart();
489 unsigned char *EndBufPtr = BufPtr+MemBuf->getBufferSize();
490
491 // If we have a wrapper header, parse it and ignore the non-bc file contents.
492 // The magic number is 0x0B17C0DE stored in little endian.
493 if (isBitcodeWrapper(BufPtr, EndBufPtr))
494 if (SkipBitcodeWrapperHeader(BufPtr, EndBufPtr))
495 return Error("Invalid bitcode wrapper header");
496
497 BitstreamReader StreamFile(BufPtr, EndBufPtr);
498 BitstreamCursor Stream(StreamFile);
499 StreamFile.CollectBlockInfoNames();
500
501 // Read the stream signature.
502 char Signature[6];
503 Signature[0] = Stream.Read(8);
504 Signature[1] = Stream.Read(8);
505 Signature[2] = Stream.Read(4);
506 Signature[3] = Stream.Read(4);
507 Signature[4] = Stream.Read(4);
508 Signature[5] = Stream.Read(4);
509
510 // Autodetect the file contents, if it is one we know.
511 CurStreamType = UnknownBitstream;
512 if (Signature[0] == 'B' && Signature[1] == 'C' &&
513 Signature[2] == 0x0 && Signature[3] == 0xC &&
514 Signature[4] == 0xE && Signature[5] == 0xD)
515 CurStreamType = LLVMIRBitstream;
516
517 unsigned NumTopBlocks = 0;
518
519 // Parse the top-level structure. We only allow blocks at the top-level.
520 while (!Stream.AtEndOfStream()) {
521 unsigned Code = Stream.ReadCode();
522 if (Code != bitc::ENTER_SUBBLOCK)
523 return Error("Invalid record at top-level");
524
525 if (ParseBlock(Stream, 0))
526 return true;
527 ++NumTopBlocks;
528 }
529
530 if (Dump) errs() << "\n\n";
531
532 uint64_t BufferSizeBits = (EndBufPtr-BufPtr)*CHAR_BIT;
533 // Print a summary of the read file.
534 errs() << "Summary of " << InputFilename << ":\n";
535 errs() << " Total size: ";
536 PrintSize(BufferSizeBits);
537 errs() << "\n";
538 errs() << " Stream type: ";
539 switch (CurStreamType) {
540 default: assert(0 && "Unknown bitstream type");
541 case UnknownBitstream: errs() << "unknown\n"; break;
542 case LLVMIRBitstream: errs() << "LLVM IR\n"; break;
543 }
544 errs() << " # Toplevel Blocks: " << NumTopBlocks << "\n";
545 errs() << "\n";
546
547 // Emit per-block stats.
548 errs() << "Per-block Summary:\n";
549 for (std::map<unsigned, PerBlockIDStats>::iterator I = BlockIDStats.begin(),
550 E = BlockIDStats.end(); I != E; ++I) {
551 errs() << " Block ID #" << I->first;
552 if (const char *BlockName = GetBlockName(I->first, StreamFile))
553 errs() << " (" << BlockName << ")";
554 errs() << ":\n";
555
556 const PerBlockIDStats &Stats = I->second;
557 errs() << " Num Instances: " << Stats.NumInstances << "\n";
558 errs() << " Total Size: ";
559 PrintSize(Stats.NumBits);
560 errs() << "\n";
561 double pct = (Stats.NumBits * 100.0) / BufferSizeBits;
562 errs() << " Percent of file: " << format("%2.4f%%", pct) << "\n";
563 if (Stats.NumInstances > 1) {
564 errs() << " Average Size: ";
565 PrintSize(Stats.NumBits/(double)Stats.NumInstances);
566 errs() << "\n";
567 errs() << " Tot/Avg SubBlocks: " << Stats.NumSubBlocks << "/"
568 << Stats.NumSubBlocks/(double)Stats.NumInstances << "\n";
569 errs() << " Tot/Avg Abbrevs: " << Stats.NumAbbrevs << "/"
570 << Stats.NumAbbrevs/(double)Stats.NumInstances << "\n";
571 errs() << " Tot/Avg Records: " << Stats.NumRecords << "/"
572 << Stats.NumRecords/(double)Stats.NumInstances << "\n";
573 } else {
574 errs() << " Num SubBlocks: " << Stats.NumSubBlocks << "\n";
575 errs() << " Num Abbrevs: " << Stats.NumAbbrevs << "\n";
576 errs() << " Num Records: " << Stats.NumRecords << "\n";
577 }
578 if (Stats.NumRecords) {
579 double pct = (Stats.NumAbbreviatedRecords * 100.0) / Stats.NumRecords;
580 errs() << " Percent Abbrevs: " << format("%2.4f%%", pct) << "\n";
581 }
582 errs() << "\n";
583
584 // Print a histogram of the codes we see.
585 if (!NoHistogram && !Stats.CodeFreq.empty()) {
586 std::vector<std::pair<unsigned, unsigned> > FreqPairs; // <freq,code>
587 for (unsigned i = 0, e = Stats.CodeFreq.size(); i != e; ++i)
588 if (unsigned Freq = Stats.CodeFreq[i].NumInstances)
589 FreqPairs.push_back(std::make_pair(Freq, i));
590 std::stable_sort(FreqPairs.begin(), FreqPairs.end());
591 std::reverse(FreqPairs.begin(), FreqPairs.end());
592
593 errs() << "\tRecord Histogram:\n";
594 fprintf(stderr, "\t\t Count # Bits %% Abv Record Kind\n");
595 for (unsigned i = 0, e = FreqPairs.size(); i != e; ++i) {
596 const PerRecordStats &RecStats = Stats.CodeFreq[FreqPairs[i].second];
597
598 fprintf(stderr, "\t\t%7d %9lu ", RecStats.NumInstances,
599 (unsigned long)RecStats.TotalBits);
600
601 if (RecStats.NumAbbrev)
602 fprintf(stderr, "%7.2f ",
603 (double)RecStats.NumAbbrev/RecStats.NumInstances*100);
604 else
605 fprintf(stderr, " ");
606
607 if (const char *CodeName =
608 GetCodeName(FreqPairs[i].second, I->first, StreamFile))
609 fprintf(stderr, "%s\n", CodeName);
610 else
611 fprintf(stderr, "UnknownCode%d\n", FreqPairs[i].second);
612 }
613 errs() << "\n";
614
615 }
616 }
617 return 0;
618 }
619
620
main(int argc,char ** argv)621 int main(int argc, char **argv) {
622 // Print a stack trace if we signal out.
623 sys::PrintStackTraceOnErrorSignal();
624 PrettyStackTraceProgram X(argc, argv);
625 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
626 cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n");
627
628 return AnalyzeBitcode();
629 }
630