From 7a263ea8598c03c8522d66ea8db5113d6b4d640e Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sat, 5 May 2007 00:47:19 +0000 Subject: [PATCH] add an abbreviation for the type symtab, this shrinks the TST from 175197 bits 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36769 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Bitcode/Writer/BitcodeWriter.cpp | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp index 35e75da303b..a3c3c6bc9c4 100644 --- a/lib/Bitcode/Writer/BitcodeWriter.cpp +++ b/lib/Bitcode/Writer/BitcodeWriter.cpp @@ -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 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(); }