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llvm-6502/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
Chris Lattner a6245247e9 Add special case bitcode support for DebugLoc. This avoids 
having the bitcode writer materialize mdnodes for all the
debug location tuples when writing out the bc file and 
stores the information in a more compact form.  For example,
the -O0 -g bc file for combine.c in 176.gcc shrinks from
739392 to 512096 bytes.

This concludes my planned short-term debug info work.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100261 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-03 02:17:50 +00:00

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//===-- llvm-bcanalyzer.cpp - Bitcode Analyzer --------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tool may be invoked in the following manner:
// llvm-bcanalyzer [options] - Read LLVM bitcode from stdin
// llvm-bcanalyzer [options] x.bc - Read LLVM bitcode from the x.bc file
//
// Options:
// --help - Output information about command line switches
// --dump - Dump low-level bitcode structure in readable format
//
// This tool provides analytical information about a bitcode file. It is
// intended as an aid to developers of bitcode reading and writing software. It
// produces on std::out a summary of the bitcode file that shows various
// statistics about the contents of the file. By default this information is
// detailed and contains information about individual bitcode blocks and the
// functions in the module.
// The tool is also able to print a bitcode file in a straight forward text
// format that shows the containment and relationships of the information in
// the bitcode file (-dump option).
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Bitcode/LLVMBitCodes.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Signals.h"
#include <cstdio>
#include <map>
#include <algorithm>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("-o", cl::init("-"), cl::desc("<output file>"));
static cl::opt<bool> Dump("dump", cl::desc("Dump low level bitcode trace"));
//===----------------------------------------------------------------------===//
// Bitcode specific analysis.
//===----------------------------------------------------------------------===//
static cl::opt<bool> NoHistogram("disable-histogram",
cl::desc("Do not print per-code histogram"));
static cl::opt<bool>
NonSymbolic("non-symbolic",
cl::desc("Emit numberic info in dump even if"
" symbolic info is available"));
/// CurStreamType - If we can sniff the flavor of this stream, we can produce
/// better dump info.
static enum {
UnknownBitstream,
LLVMIRBitstream
} CurStreamType;
/// GetBlockName - Return a symbolic block name if known, otherwise return
/// null.
static const char *GetBlockName(unsigned BlockID,
const BitstreamReader &StreamFile) {
// Standard blocks for all bitcode files.
if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
if (BlockID == bitc::BLOCKINFO_BLOCK_ID)
return "BLOCKINFO_BLOCK";
return 0;
}
// Check to see if we have a blockinfo record for this block, with a name.
if (const BitstreamReader::BlockInfo *Info =
StreamFile.getBlockInfo(BlockID)) {
if (!Info->Name.empty())
return Info->Name.c_str();
}
if (CurStreamType != LLVMIRBitstream) return 0;
switch (BlockID) {
default: return 0;
case bitc::MODULE_BLOCK_ID: return "MODULE_BLOCK";
case bitc::PARAMATTR_BLOCK_ID: return "PARAMATTR_BLOCK";
case bitc::TYPE_BLOCK_ID: return "TYPE_BLOCK";
case bitc::CONSTANTS_BLOCK_ID: return "CONSTANTS_BLOCK";
case bitc::FUNCTION_BLOCK_ID: return "FUNCTION_BLOCK";
case bitc::TYPE_SYMTAB_BLOCK_ID: return "TYPE_SYMTAB";
case bitc::VALUE_SYMTAB_BLOCK_ID: return "VALUE_SYMTAB";
case bitc::METADATA_BLOCK_ID: return "METADATA_BLOCK";
case bitc::METADATA_ATTACHMENT_ID: return "METADATA_ATTACHMENT_BLOCK";
}
}
/// GetCodeName - Return a symbolic code name if known, otherwise return
/// null.
static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
const BitstreamReader &StreamFile) {
// Standard blocks for all bitcode files.
if (BlockID < bitc::FIRST_APPLICATION_BLOCKID) {
if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
switch (CodeID) {
default: return 0;
case bitc::BLOCKINFO_CODE_SETBID: return "SETBID";
case bitc::BLOCKINFO_CODE_BLOCKNAME: return "BLOCKNAME";
case bitc::BLOCKINFO_CODE_SETRECORDNAME: return "SETRECORDNAME";
}
}
return 0;
}
// Check to see if we have a blockinfo record for this record, with a name.
if (const BitstreamReader::BlockInfo *Info =
StreamFile.getBlockInfo(BlockID)) {
for (unsigned i = 0, e = Info->RecordNames.size(); i != e; ++i)
if (Info->RecordNames[i].first == CodeID)
return Info->RecordNames[i].second.c_str();
}
if (CurStreamType != LLVMIRBitstream) return 0;
switch (BlockID) {
default: return 0;
case bitc::MODULE_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::MODULE_CODE_VERSION: return "VERSION";
case bitc::MODULE_CODE_TRIPLE: return "TRIPLE";
case bitc::MODULE_CODE_DATALAYOUT: return "DATALAYOUT";
case bitc::MODULE_CODE_ASM: return "ASM";
case bitc::MODULE_CODE_SECTIONNAME: return "SECTIONNAME";
case bitc::MODULE_CODE_DEPLIB: return "DEPLIB";
case bitc::MODULE_CODE_GLOBALVAR: return "GLOBALVAR";
case bitc::MODULE_CODE_FUNCTION: return "FUNCTION";
case bitc::MODULE_CODE_ALIAS: return "ALIAS";
case bitc::MODULE_CODE_PURGEVALS: return "PURGEVALS";
case bitc::MODULE_CODE_GCNAME: return "GCNAME";
}
case bitc::PARAMATTR_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::PARAMATTR_CODE_ENTRY: return "ENTRY";
}
case bitc::TYPE_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::TYPE_CODE_NUMENTRY: return "NUMENTRY";
case bitc::TYPE_CODE_VOID: return "VOID";
case bitc::TYPE_CODE_FLOAT: return "FLOAT";
case bitc::TYPE_CODE_DOUBLE: return "DOUBLE";
case bitc::TYPE_CODE_LABEL: return "LABEL";
case bitc::TYPE_CODE_OPAQUE: return "OPAQUE";
case bitc::TYPE_CODE_INTEGER: return "INTEGER";
case bitc::TYPE_CODE_POINTER: return "POINTER";
case bitc::TYPE_CODE_FUNCTION: return "FUNCTION";
case bitc::TYPE_CODE_STRUCT: return "STRUCT";
case bitc::TYPE_CODE_ARRAY: return "ARRAY";
case bitc::TYPE_CODE_VECTOR: return "VECTOR";
case bitc::TYPE_CODE_X86_FP80: return "X86_FP80";
case bitc::TYPE_CODE_FP128: return "FP128";
case bitc::TYPE_CODE_PPC_FP128: return "PPC_FP128";
case bitc::TYPE_CODE_METADATA: return "METADATA";
}
case bitc::CONSTANTS_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::CST_CODE_SETTYPE: return "SETTYPE";
case bitc::CST_CODE_NULL: return "NULL";
case bitc::CST_CODE_UNDEF: return "UNDEF";
case bitc::CST_CODE_INTEGER: return "INTEGER";
case bitc::CST_CODE_WIDE_INTEGER: return "WIDE_INTEGER";
case bitc::CST_CODE_FLOAT: return "FLOAT";
case bitc::CST_CODE_AGGREGATE: return "AGGREGATE";
case bitc::CST_CODE_STRING: return "STRING";
case bitc::CST_CODE_CSTRING: return "CSTRING";
case bitc::CST_CODE_CE_BINOP: return "CE_BINOP";
case bitc::CST_CODE_CE_CAST: return "CE_CAST";
case bitc::CST_CODE_CE_GEP: return "CE_GEP";
case bitc::CST_CODE_CE_INBOUNDS_GEP: return "CE_INBOUNDS_GEP";
case bitc::CST_CODE_CE_SELECT: return "CE_SELECT";
case bitc::CST_CODE_CE_EXTRACTELT: return "CE_EXTRACTELT";
case bitc::CST_CODE_CE_INSERTELT: return "CE_INSERTELT";
case bitc::CST_CODE_CE_SHUFFLEVEC: return "CE_SHUFFLEVEC";
case bitc::CST_CODE_CE_CMP: return "CE_CMP";
case bitc::CST_CODE_INLINEASM: return "INLINEASM";
case bitc::CST_CODE_CE_SHUFVEC_EX: return "CE_SHUFVEC_EX";
}
case bitc::FUNCTION_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::FUNC_CODE_DECLAREBLOCKS: return "DECLAREBLOCKS";
case bitc::FUNC_CODE_INST_BINOP: return "INST_BINOP";
case bitc::FUNC_CODE_INST_CAST: return "INST_CAST";
case bitc::FUNC_CODE_INST_GEP: return "INST_GEP";
case bitc::FUNC_CODE_INST_INBOUNDS_GEP: return "INST_INBOUNDS_GEP";
case bitc::FUNC_CODE_INST_SELECT: return "INST_SELECT";
case bitc::FUNC_CODE_INST_EXTRACTELT: return "INST_EXTRACTELT";
case bitc::FUNC_CODE_INST_INSERTELT: return "INST_INSERTELT";
case bitc::FUNC_CODE_INST_SHUFFLEVEC: return "INST_SHUFFLEVEC";
case bitc::FUNC_CODE_INST_CMP: return "INST_CMP";
case bitc::FUNC_CODE_INST_RET: return "INST_RET";
case bitc::FUNC_CODE_INST_BR: return "INST_BR";
case bitc::FUNC_CODE_INST_SWITCH: return "INST_SWITCH";
case bitc::FUNC_CODE_INST_INVOKE: return "INST_INVOKE";
case bitc::FUNC_CODE_INST_UNWIND: return "INST_UNWIND";
case bitc::FUNC_CODE_INST_UNREACHABLE: return "INST_UNREACHABLE";
case bitc::FUNC_CODE_INST_PHI: return "INST_PHI";
case bitc::FUNC_CODE_INST_MALLOC: return "INST_MALLOC";
case bitc::FUNC_CODE_INST_FREE: return "INST_FREE";
case bitc::FUNC_CODE_INST_ALLOCA: return "INST_ALLOCA";
case bitc::FUNC_CODE_INST_LOAD: return "INST_LOAD";
case bitc::FUNC_CODE_INST_STORE: return "INST_STORE";
case bitc::FUNC_CODE_INST_CALL: return "INST_CALL";
case bitc::FUNC_CODE_INST_VAARG: return "INST_VAARG";
case bitc::FUNC_CODE_INST_STORE2: return "INST_STORE2";
case bitc::FUNC_CODE_INST_GETRESULT: return "INST_GETRESULT";
case bitc::FUNC_CODE_INST_EXTRACTVAL: return "INST_EXTRACTVAL";
case bitc::FUNC_CODE_INST_INSERTVAL: return "INST_INSERTVAL";
case bitc::FUNC_CODE_INST_CMP2: return "INST_CMP2";
case bitc::FUNC_CODE_INST_VSELECT: return "INST_VSELECT";
case bitc::FUNC_CODE_DEBUG_LOC: return "DEBUG_LOC";
case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: return "DEBUG_LOC_AGAIN";
}
case bitc::TYPE_SYMTAB_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::TST_CODE_ENTRY: return "ENTRY";
}
case bitc::VALUE_SYMTAB_BLOCK_ID:
switch (CodeID) {
default: return 0;
case bitc::VST_CODE_ENTRY: return "ENTRY";
case bitc::VST_CODE_BBENTRY: return "BBENTRY";
}
case bitc::METADATA_ATTACHMENT_ID:
switch(CodeID) {
default:return 0;
case bitc::METADATA_ATTACHMENT: return "METADATA_ATTACHMENT";
}
case bitc::METADATA_BLOCK_ID:
switch(CodeID) {
default:return 0;
case bitc::METADATA_STRING: return "MDSTRING";
case bitc::METADATA_NODE: return "MDNODE";
case bitc::METADATA_FN_NODE: return "FN_MDNODE";
case bitc::METADATA_NAME: return "METADATA_NAME";
case bitc::METADATA_NAMED_NODE: return "NAMEDMDNODE";
case bitc::METADATA_KIND: return "METADATA_KIND";
case bitc::METADATA_ATTACHMENT: return "METADATA_ATTACHMENT";
}
}
}
struct PerRecordStats {
unsigned NumInstances;
unsigned NumAbbrev;
uint64_t TotalBits;
PerRecordStats() : NumInstances(0), NumAbbrev(0), TotalBits(0) {}
};
struct PerBlockIDStats {
/// NumInstances - This the number of times this block ID has been seen.
unsigned NumInstances;
/// NumBits - The total size in bits of all of these blocks.
uint64_t NumBits;
/// NumSubBlocks - The total number of blocks these blocks contain.
unsigned NumSubBlocks;
/// NumAbbrevs - The total number of abbreviations.
unsigned NumAbbrevs;
/// NumRecords - The total number of records these blocks contain, and the
/// number that are abbreviated.
unsigned NumRecords, NumAbbreviatedRecords;
/// CodeFreq - Keep track of the number of times we see each code.
std::vector<PerRecordStats> CodeFreq;
PerBlockIDStats()
: NumInstances(0), NumBits(0),
NumSubBlocks(0), NumAbbrevs(0), NumRecords(0), NumAbbreviatedRecords(0) {}
};
static std::map<unsigned, PerBlockIDStats> BlockIDStats;
/// Error - All bitcode analysis errors go through this function, making this a
/// good place to breakpoint if debugging.
static bool Error(const std::string &Err) {
errs() << Err << "\n";
return true;
}
/// ParseBlock - Read a block, updating statistics, etc.
static bool ParseBlock(BitstreamCursor &Stream, unsigned IndentLevel) {
std::string Indent(IndentLevel*2, ' ');
uint64_t BlockBitStart = Stream.GetCurrentBitNo();
unsigned BlockID = Stream.ReadSubBlockID();
// Get the statistics for this BlockID.
PerBlockIDStats &BlockStats = BlockIDStats[BlockID];
BlockStats.NumInstances++;
// BLOCKINFO is a special part of the stream.
if (BlockID == bitc::BLOCKINFO_BLOCK_ID) {
if (Dump) errs() << Indent << "<BLOCKINFO_BLOCK/>\n";
if (Stream.ReadBlockInfoBlock())
return Error("Malformed BlockInfoBlock");
uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
BlockStats.NumBits += BlockBitEnd-BlockBitStart;
return false;
}
unsigned NumWords = 0;
if (Stream.EnterSubBlock(BlockID, &NumWords))
return Error("Malformed block record");
const char *BlockName = 0;
if (Dump) {
errs() << Indent << "<";
if ((BlockName = GetBlockName(BlockID, *Stream.getBitStreamReader())))
errs() << BlockName;
else
errs() << "UnknownBlock" << BlockID;
if (NonSymbolic && BlockName)
errs() << " BlockID=" << BlockID;
errs() << " NumWords=" << NumWords
<< " BlockCodeSize=" << Stream.GetAbbrevIDWidth() << ">\n";
}
SmallVector<uint64_t, 64> Record;
// Read all the records for this block.
while (1) {
if (Stream.AtEndOfStream())
return Error("Premature end of bitstream");
uint64_t RecordStartBit = Stream.GetCurrentBitNo();
// Read the code for this record.
unsigned AbbrevID = Stream.ReadCode();
switch (AbbrevID) {
case bitc::END_BLOCK: {
if (Stream.ReadBlockEnd())
return Error("Error at end of block");
uint64_t BlockBitEnd = Stream.GetCurrentBitNo();
BlockStats.NumBits += BlockBitEnd-BlockBitStart;
if (Dump) {
errs() << Indent << "</";
if (BlockName)
errs() << BlockName << ">\n";
else
errs() << "UnknownBlock" << BlockID << ">\n";
}
return false;
}
case bitc::ENTER_SUBBLOCK: {
uint64_t SubBlockBitStart = Stream.GetCurrentBitNo();
if (ParseBlock(Stream, IndentLevel+1))
return true;
++BlockStats.NumSubBlocks;
uint64_t SubBlockBitEnd = Stream.GetCurrentBitNo();
// Don't include subblock sizes in the size of this block.
BlockBitStart += SubBlockBitEnd-SubBlockBitStart;
break;
}
case bitc::DEFINE_ABBREV:
Stream.ReadAbbrevRecord();
++BlockStats.NumAbbrevs;
break;
default:
Record.clear();
++BlockStats.NumRecords;
if (AbbrevID != bitc::UNABBREV_RECORD)
++BlockStats.NumAbbreviatedRecords;
const char *BlobStart = 0;
unsigned BlobLen = 0;
unsigned Code = Stream.ReadRecord(AbbrevID, Record, BlobStart, BlobLen);
// Increment the # occurrences of this code.
if (BlockStats.CodeFreq.size() <= Code)
BlockStats.CodeFreq.resize(Code+1);
BlockStats.CodeFreq[Code].NumInstances++;
BlockStats.CodeFreq[Code].TotalBits +=
Stream.GetCurrentBitNo()-RecordStartBit;
if (AbbrevID != bitc::UNABBREV_RECORD)
BlockStats.CodeFreq[Code].NumAbbrev++;
if (Dump) {
errs() << Indent << " <";
if (const char *CodeName =
GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
errs() << CodeName;
else
errs() << "UnknownCode" << Code;
if (NonSymbolic &&
GetCodeName(Code, BlockID, *Stream.getBitStreamReader()))
errs() << " codeid=" << Code;
if (AbbrevID != bitc::UNABBREV_RECORD)
errs() << " abbrevid=" << AbbrevID;
for (unsigned i = 0, e = Record.size(); i != e; ++i)
errs() << " op" << i << "=" << (int64_t)Record[i];
errs() << "/>";
if (BlobStart) {
errs() << " blob data = ";
bool BlobIsPrintable = true;
for (unsigned i = 0; i != BlobLen; ++i)
if (!isprint(BlobStart[i])) {
BlobIsPrintable = false;
break;
}
if (BlobIsPrintable)
errs() << "'" << std::string(BlobStart, BlobStart+BlobLen) <<"'";
else
errs() << "unprintable, " << BlobLen << " bytes.";
}
errs() << "\n";
}
break;
}
}
}
static void PrintSize(double Bits) {
fprintf(stderr, "%.2f/%.2fB/%lluW", Bits, Bits/8,(unsigned long long)Bits/32);
}
static void PrintSize(uint64_t Bits) {
fprintf(stderr, "%llub/%.2fB/%lluW", (unsigned long long)Bits,
(double)Bits/8, (unsigned long long)Bits/32);
}
/// AnalyzeBitcode - Analyze the bitcode file specified by InputFilename.
static int AnalyzeBitcode() {
// Read the input file.
MemoryBuffer *MemBuf = MemoryBuffer::getFileOrSTDIN(InputFilename.c_str());
if (MemBuf == 0)
return Error("Error reading '" + InputFilename + "'.");
if (MemBuf->getBufferSize() & 3)
return Error("Bitcode stream should be a multiple of 4 bytes in length");
unsigned char *BufPtr = (unsigned char *)MemBuf->getBufferStart();
unsigned char *EndBufPtr = BufPtr+MemBuf->getBufferSize();
// If we have a wrapper header, parse it and ignore the non-bc file contents.
// The magic number is 0x0B17C0DE stored in little endian.
if (isBitcodeWrapper(BufPtr, EndBufPtr))
if (SkipBitcodeWrapperHeader(BufPtr, EndBufPtr))
return Error("Invalid bitcode wrapper header");
BitstreamReader StreamFile(BufPtr, EndBufPtr);
BitstreamCursor Stream(StreamFile);
StreamFile.CollectBlockInfoNames();
// Read the stream signature.
char Signature[6];
Signature[0] = Stream.Read(8);
Signature[1] = Stream.Read(8);
Signature[2] = Stream.Read(4);
Signature[3] = Stream.Read(4);
Signature[4] = Stream.Read(4);
Signature[5] = Stream.Read(4);
// Autodetect the file contents, if it is one we know.
CurStreamType = UnknownBitstream;
if (Signature[0] == 'B' && Signature[1] == 'C' &&
Signature[2] == 0x0 && Signature[3] == 0xC &&
Signature[4] == 0xE && Signature[5] == 0xD)
CurStreamType = LLVMIRBitstream;
unsigned NumTopBlocks = 0;
// Parse the top-level structure. We only allow blocks at the top-level.
while (!Stream.AtEndOfStream()) {
unsigned Code = Stream.ReadCode();
if (Code != bitc::ENTER_SUBBLOCK)
return Error("Invalid record at top-level");
if (ParseBlock(Stream, 0))
return true;
++NumTopBlocks;
}
if (Dump) errs() << "\n\n";
uint64_t BufferSizeBits = (EndBufPtr-BufPtr)*CHAR_BIT;
// Print a summary of the read file.
errs() << "Summary of " << InputFilename << ":\n";
errs() << " Total size: ";
PrintSize(BufferSizeBits);
errs() << "\n";
errs() << " Stream type: ";
switch (CurStreamType) {
default: assert(0 && "Unknown bitstream type");
case UnknownBitstream: errs() << "unknown\n"; break;
case LLVMIRBitstream: errs() << "LLVM IR\n"; break;
}
errs() << " # Toplevel Blocks: " << NumTopBlocks << "\n";
errs() << "\n";
// Emit per-block stats.
errs() << "Per-block Summary:\n";
for (std::map<unsigned, PerBlockIDStats>::iterator I = BlockIDStats.begin(),
E = BlockIDStats.end(); I != E; ++I) {
errs() << " Block ID #" << I->first;
if (const char *BlockName = GetBlockName(I->first, StreamFile))
errs() << " (" << BlockName << ")";
errs() << ":\n";
const PerBlockIDStats &Stats = I->second;
errs() << " Num Instances: " << Stats.NumInstances << "\n";
errs() << " Total Size: ";
PrintSize(Stats.NumBits);
errs() << "\n";
double pct = (Stats.NumBits * 100.0) / BufferSizeBits;
errs() << " Percent of file: " << format("%2.4f%%", pct) << "\n";
if (Stats.NumInstances > 1) {
errs() << " Average Size: ";
PrintSize(Stats.NumBits/(double)Stats.NumInstances);
errs() << "\n";
errs() << " Tot/Avg SubBlocks: " << Stats.NumSubBlocks << "/"
<< Stats.NumSubBlocks/(double)Stats.NumInstances << "\n";
errs() << " Tot/Avg Abbrevs: " << Stats.NumAbbrevs << "/"
<< Stats.NumAbbrevs/(double)Stats.NumInstances << "\n";
errs() << " Tot/Avg Records: " << Stats.NumRecords << "/"
<< Stats.NumRecords/(double)Stats.NumInstances << "\n";
} else {
errs() << " Num SubBlocks: " << Stats.NumSubBlocks << "\n";
errs() << " Num Abbrevs: " << Stats.NumAbbrevs << "\n";
errs() << " Num Records: " << Stats.NumRecords << "\n";
}
if (Stats.NumRecords) {
double pct = (Stats.NumAbbreviatedRecords * 100.0) / Stats.NumRecords;
errs() << " Percent Abbrevs: " << format("%2.4f%%", pct) << "\n";
}
errs() << "\n";
// Print a histogram of the codes we see.
if (!NoHistogram && !Stats.CodeFreq.empty()) {
std::vector<std::pair<unsigned, unsigned> > FreqPairs; // <freq,code>
for (unsigned i = 0, e = Stats.CodeFreq.size(); i != e; ++i)
if (unsigned Freq = Stats.CodeFreq[i].NumInstances)
FreqPairs.push_back(std::make_pair(Freq, i));
std::stable_sort(FreqPairs.begin(), FreqPairs.end());
std::reverse(FreqPairs.begin(), FreqPairs.end());
errs() << "\tRecord Histogram:\n";
fprintf(stderr, "\t\t Count # Bits %% Abv Record Kind\n");
for (unsigned i = 0, e = FreqPairs.size(); i != e; ++i) {
const PerRecordStats &RecStats = Stats.CodeFreq[FreqPairs[i].second];
fprintf(stderr, "\t\t%7d %9llu ", RecStats.NumInstances,
(unsigned long long)RecStats.TotalBits);
if (RecStats.NumAbbrev)
fprintf(stderr, "%7.2f ",
(double)RecStats.NumAbbrev/RecStats.NumInstances*100);
else
fprintf(stderr, " ");
if (const char *CodeName =
GetCodeName(FreqPairs[i].second, I->first, StreamFile))
fprintf(stderr, "%s\n", CodeName);
else
fprintf(stderr, "UnknownCode%d\n", FreqPairs[i].second);
}
errs() << "\n";
}
}
return 0;
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm-bcanalyzer file analyzer\n");
return AnalyzeBitcode();
}
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