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add an abbreviation for the type symtab, this shrinks the TST from 175197 bits

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to 103165 bits:

Old:
  Block ID #13 (TYPE_SYMTAB):
      Num Instances: 1
         Total Size: 175197b/21899.6B/5474.91W
       Average Size: 175197b/21899.6B/5474.91W
          % of file: 0.657023
  Tot/Avg SubBlocks: 0/0
    Tot/Avg Abbrevs: 0/0
    Tot/Avg Records: 255/255
      % Abbrev Recs: 0

New:
  Block ID #13 (TYPE_SYMTAB):
      Num Instances: 1
         Total Size: 103165b/12895.6B/3223.91W
       Average Size: 103165b/12895.6B/3223.91W
          % of file: 0.387937
  Tot/Avg SubBlocks: 0/0
    Tot/Avg Abbrevs: 1/1
    Tot/Avg Records: 255/255
      % Abbrev Recs: 100

llvm-svn: 36769
This commit is contained in:
Chris Lattner 2007-05-05 00:47:19 +00:00
parent 817fbdc02d
commit 277c22f0a9
1 changed files with 16 additions and 8 deletions
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24
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -798,24 +798,32 @@ static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
// FIXME: Set up the abbrev, we know how many types there are!
// FIXME: We know if the type names can use 7-bit ascii.
// 7-bit fixed width VST_CODE_ENTRY strings.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getTypes().size()+1)));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
SmallVector<unsigned, 64> NameVals;
for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
TI != TE; ++TI) {
unsigned AbbrevToUse = 0;
// TST_ENTRY: [typeid, namelen, namechar x N]
// TST_ENTRY: [typeid, namechar x N]
NameVals.push_back(VE.getTypeID(TI->second));
const std::string &Str = TI->first;
for (unsigned i = 0, e = Str.size(); i != e; ++i)
NameVals.push_back(Str[i]);
bool is7Bit = true;
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
NameVals.push_back((unsigned char)Str[i]);
if (Str[i] & 128)
is7Bit = false;
}
// Emit the finished record.
Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, AbbrevToUse);
Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
NameVals.clear();
}